Magnetic disk cartridge

The present invention relates to a small magnetic disk cartridge that can be interchangeably loaded into a disk drive or the like provided in a digital still camera, a digital video camera, a notebook computer, or the like.

[0002] Conventionally, various recording media are removably loaded in a card slot of an electronic device such as a digital still camera, a digital video camera, or a notebook computer, and recording / playback is performed. .. As such recording media, various types such as semiconductor memory type, hard disk type, optical disk type, and small magnetic disks such as floppy (registered trademark) disks have been put into practical use. There is.

[0003] [Problems to be Solved by the Invention] Among these, the semiconductor memory is easy to handle and the recording capacity is appropriately large, so that it is the most popular, but the price is relatively high. Therefore, in a digital camera or the like using these memories, it is common to transfer the captured image data to a personal computer or the like and save it, then delete the data and use the recording medium repeatedly.

[0004] As a hard disk type, a hard disk type having a capacity of 340 MB or 1 GB is known, but this is also expensive, and data is transferred to another and stored, and the recording medium is used repeatedly.

[0005] The optical disc type has a large recording capacity for its size. For example, 256 MB of data can be recorded in a size of 35 mm × 41 mm × 11 mm, and a product having a recording capacity of 512 MB will be realized. It is supposed to be. However, since optical discs take a long time to write, they have a drawback that the recording speed is slow.

[0006] On the other hand, a magnetic disk such as a floppy (registered trademark) disk can be made into a small size of about 50 mm × 55 mm × 2 mm, and this can be interchangeably loaded into a disk drive having a size that can be inserted into a card slot of a personal computer or the like. Although it is known that it has a small capacity of 40MB, it is insufficient in capacity from the viewpoint of recording camera images, and its size is not suitable for digital cameras.

[0007] In recent years, digital cameras have been combined with the background of the society in which personal computers have become widespread, such as the ease of recording, the improvement of image quality by developing an image sensor, the possibility of data deletion and transfer, and the large recording capacity. Therefore, although it is rapidly becoming widespread, the mode of use thereof is limited because the recording medium (hereinafter referred to as media) is limited in terms of price and capacity as described above. For example, because media is expensive, we do not have many media in one camera, but when the data is full, we move it to a computer and delete it, and use one media repeatedly. Is normal, as described above. Therefore, there may be a shortage of recording media while traveling, and it is not possible to save the media containing the data as it is or give it to people.

[0008] Therefore, it is desired to realize a large-capacity, inexpensive, small-sized medium so that the data taken by the digital camera can be saved as it is or can be easily uploaded to a person. In addition, it is desired to realize a large-capacity, inexpensive, small-sized medium that can input data and pass it on to a person in a personal computer.

[0009] In response to such demands, as a large-capacity, inexpensive, compact medium that can store data taken with a digital camera or computer data as it is, or easily give it to a person, a computer or computer can be used. A medium consisting of a card-type disk drive that can be loaded into an electronic device such as a digital camera and a magnetic disk cartridge that can be loaded into the disk drive can be considered. That is, as such a magnetic disk cartridge, a flexible magnetic disk capable of high-density magnetic recording is rotatably housed in a housing provided with an open / close shutter, and the magnetic disk cartridge has a recording capacity of, for example, 200 MB or more. Is considered. As the high recording density magnetic recording medium for that purpose, a medium having a metal thin film formed by a vapor deposition method or a sputtering method, or a medium using barium ferrite powder or ferromagnetic metal powder can be adopted. As an example of using barium ferrite powder, there is Japanese Patent Application No. 2001-312864 filed by the present applicant.

[0010] The "high recording density magnetic recording medium using barium ferrite powder" is a magnetic disk containing barium ferrite powder in a magnetic layer, and uses a material capable of achieving high recording density. For example, a non-magnetic layer containing a non-magnetic powder and a binder, and a ferromagnetic powder and a bond, which is a hexagonal ferrite powder, on at least one surface of the non-magnetic support disclosed in Japanese Patent Application No. 2001-205290. A magnetic recording medium having a magnetic layer containing an agent in this order, wherein the non-magnetic layer contains 10 to 50 parts by mass of carbon black having an average particle size of 10 to 30 nm with respect to 100 parts by mass of the non-magnetic powder, and is magnetic. The thickness of the layer is 0.2 μm or less, the standard deviation b of the intensity with respect to the average intensity a of the element due to the ferromagnetic powder by electron beam microanalysis is 0.03 b / a 0.4, and the center of the magnetic layer. A magnetic recording medium having a surface average roughness Ra of 5 nm or less and a 10-point average roughness Rz of 40 nm or less. For a magnetic disk using this material, information is recorded and reproduced using, for example, a magnetic head such as an MR head capable of high recording density.

[0011] According to the invention of the above-mentioned media, it is possible to realize a medium having a recording capacity of 200 MB or more, preferably 500 MB or more, and thereby, for example, in the case of a still image, one sheet is about 1 MB, and 500 sheets are realized. It can be recorded, and if it is a video, it will be possible to record about 30 minutes of video content. Therefore, it is possible to record a moving image taken by a digital camera, a moving image distributed by a mobile phone, and the like, and it is possible to improve the convenience of the user when using the content. Further, of course, it can be conveniently used as an inexpensive large-capacity data storage medium even in a personal computer, and its convenience is great.

[0012] As a preferred example of the disk drive in the present specification, in the case of a personal computer in general, as shown in FIG. 14 (a), the acceptance of the card 2 inserted into the slot for the PC card provided in the personal computer. It also means a disk drive built into a PC card, such as "click!®", in addition to the disk drive 6 that is electrically connected and loaded into the socket 4 of the unit. Further, in the case of a digital camera 3 or the like, as shown in FIG. 14 (b), the disk drive 6 is electrically connected to the socket of the receiving portion 5 of the camera 3 and loaded. Therefore, this disk drive 6 is extremely small, for example 38 mm to 55 mm in length, 35 mm to 51 mm in width and 3 mm to 5 mm in thickness, and the magnetic disk cartridge 8 is, for example, 25 mm to 36 mm in length and width. And those having a thickness of 1 mm to 3 mm can be mentioned.

[0013] By the way, it has been proposed to form the housing of such a small magnetic disk cartridge in a disk shape and handle the magnetic recording medium as if it were a coin. That is, it has been proposed to improve convenience by handling magnetic recording media as if a coin was inserted into a vending machine.

[0014] However, when the housing has a disk shape, it is necessary to be able to identify the insertion direction into the disk drive. That is, if the housing is made into a disk shape, the disc drive can be inserted regardless of the orientation of the shutter attached to the housing. If the shutter is not positioned in a predetermined position in the disk drive, information cannot be recorded and reproduced on the magnetic disk. Therefore, the housing needs to be positioned in a predetermined orientation with respect to the magnetic disk drive.

[0015] Further, when such a magnetic disk cartridge is loaded into the disk drive, for example, a protrusion on the disk drive side is engaged in a positioning hole or recess provided in the housing of the magnetic disk cartridge, and the magnetic disk drive is magnetic. The disk cartridge is locked in place in the disk drive, but if there is any play in this engaging part, the magnetic disk with high recording density that the disk drive has and the cartridge side The relative position of the magnetic disk with respect to the magnetic disk fluctuates, which adversely affects the recording / playback characteristics.

[0016] Further, since the magnetic disk cartridge is extremely small, there is also a problem that when the cartridge is taken out from the disk drive, the separation property from the disk drive is poor and it is difficult to take out the cartridge.

Further, since the magnetic disk cartridge is small enough to be handled like a coin, when the magnetic disk cartridge is picked up with a finger, the entire front and back surfaces are covered, and it is difficult to visually check the front and back surfaces of the magnetic disk cartridge. It becomes. Further, if both the front and back surfaces of the magnetic disk cartridge whose housing is formed in a disk shape form a substantially flat surface, it is conceivable that the magnetic disk cartridge may be inserted into the disk drive in the wrong direction.

[0018] In this way, if the magnetic disk cartridge is erroneously inserted into the disk drive, the magnetic disk cartridge is not placed at a predetermined position in the disk drive, so that information can be recorded on the magnetic disk and information from the magnetic disk can be recorded. Playback is not executed, the direction of insertion of the magnetic disk cartridge is corrected to the correct direction, and the magnetic disk cartridge is inserted into the disk drive again, which reduces the operation efficiency. Further, if the magnetic disk cartridge is forcibly pushed into the disk drive with the front and back sides wrong, the magnetic disk cartridge may break down. Therefore, there is a request to accurately identify the front and back sides of the magnetic disk cartridge.

[0019] On the other hand, in general household goods, in order to protect their users and consumers, safety measures such as always attaching a sticker with a cautionary note to the product are taken. Accidents caused by accidental ingestion and accidental ingestion of infants, especially infants in general, tend to put anything in their mouths and do not have sufficient discriminating ability, so the current situation is that the accident rate is high.

[0020] From this, it is necessary to prevent accidents caused by accidental ingestion and accidental ingestion of infants in the extremely small magnetic disk cartridge as described above. In particular, even if the magnetic disk cartridge is not accidentally swallowed, saliva or the like may adhere to the recording surface and cause an important recording / playback error by putting it in the mouth or licking it. become.

[0021] In view of the above circumstances, a first object of the present invention is a magnetic disk that can be reliably positioned with respect to a disk drive in a predetermined direction when inserted into a disk drive and can record and reproduce information. To provide cartridges.

[0022] A second object of the present invention is to prevent play when a magnetic disk cartridge is inserted into a disk drive and locked in a predetermined position in the disk drive, and to prevent play when the magnetic disk cartridge is taken out from the disk drive. The purpose is to provide an improved magnetic disk cartridge.

[0023] A third object of the present invention is to provide a magnetic disk cartridge capable of more accurately distinguishing the front and back sides.

[0024] A fourth object of the present invention is to provide a magnetic disk cartridge capable of preventing accidents due to accidental ingestion or accidental ingestion by causing an infant or the like to immediately spit it out even if it is contained in the mouth. There is.

[Means for Solving the Problems] The first invention of the present application is a magnetic disk cartridge that can be loaded into a disk drive, and the magnetic disk cartridge rotatably accommodates the magnetic disk in a housing. The housing is provided with an opening for allowing the magnetic head of the disk drive to access the surface of the magnetic disk and a shutter for opening and closing the opening, and the housing is provided along the contour of the magnetic disk. It has an outer edge shape consisting of an arc and two straight lines circumscribing a circle along the contour of the magnetic disk and orthogonal to each other.<u style="single">The housing is composed of a metal lower shell and a metal upper shell fitted to the lower shell, and the lower shell is the peripheral edge of the bottom plate except for the bottom plate and the opening portion. The upper shell is provided with a peripheral wall rising upward from the top plate, and the upper shell hangs downward from the peripheral edge of the top plate except for the top plate and the opening portion, and is elastically fitted inside the peripheral wall of the lower shell. With a peripheral wall</u>It is characterized by doing.

[0026] Above<u style="single">Lower shell</u>Has two side walls extending along the two straight lines orthogonal to each other, one of these two side walls being orthogonal to the direction in which the magnetic disk cartridge is inserted into the disk drive, and the other side wall. Is preferably parallel to the insertion direction.

[0027] Of the above two side walls, one side wall orthogonal to the insertion direction is provided at the end on the trailing side with respect to the insertion direction, and the side wall is in a direction parallel to the rotation axis of the magnetic disk. It is preferable that the size is larger than the thickness of the magnetic disk housing portion of this housing.

[0028] Further, of the above two side walls, the dimension of the other side wall parallel to the insertion direction in the direction parallel to the rotation axis of the magnetic disk is also larger than the thickness of the magnetic disk accommodating portion of this housing. Is preferable.

[0029] In that case, it is particularly preferable that the lower edges of the two side walls coincide with the lower surface of the face plate portion of the housing, and the upper edges of the two side walls project from the upper surface of the face plate portion of the housing.

[0030] Further, it is preferable that the outer surfaces of the two side walls project slightly outward from the circumscribed line of the outer peripheral surface of the peripheral wall that draws an arc along the contour of the magnetic disk adjacent thereto.

[0031] Further, it is preferable that the corner portion formed by the above two side walls is formed in one corner on the trailing side with respect to the insertion direction into the disk drive.

[0032] Further, the housing is composed of a lower shell and an upper shell fitted inside the lower shell from above, and all the components constituting the magnetic disk cartridge are contained in the lower shell. It is preferable that it is configured so that it can be assembled by a stacking method.

[0033] In that case, the lower shell side shutter is arranged inside the lower shell, the upper shell side shutter is arranged outside the upper shell, and the upper and lower shutters are coupled to each other on the front side of the opening of the housing. It is preferable that it is configured so that it can rotate integrally.

[0034] In the present invention (the same applies to the following inventions), it is preferable that the magnetic disk is a high recording density magnetic recording medium using barium ferrite powder.

Next, the second invention of the present application is a magnetic disk cartridge that can be loaded by inserting it into a disk drive, and the magnetic disk cartridge rotatably accommodates the magnetic disk in a housing. Yes, the magnetic disk cartridge is inserted into the disk drive and locked at a predetermined position in the disk drive on the trailing side with respect to the insertion direction of the housing into the disk drive, and the magnetic disk cartridge is attached in the ejection direction. It is characterized in that a means of urging is provided.

[0036] In that case, the housing extends linearly to the trailing end with respect to the insertion direction into the disk drive in a direction orthogonal to the insertion direction, and the upper edge protrudes upward from the upper surface of the face plate portion of the housing. The urging means is provided on the upper part of the side wall so as to elastically contact the outer wall surface of the upper edge of the cartridge insertion slot of the disk drive when the urging means is inserted into the disk drive. It is preferably composed of a leaf spring portion.

[0037] Further, the third invention of the present application is a magnetic disk cartridge that can be loaded into a disk drive, and the magnetic disk cartridge includes a flexible magnetic disk and a housing that rotatably accommodates the magnetic disk. The housing comprises an opening for allowing the magnetic head of the disk drive to access the surface of the magnetic disk and a shutter for opening and closing the opening, and this surface is placed on at least one of the front and back surfaces of the housing. It is characterized in that an uneven portion that can be distinguished from the other surface is provided.

[0038] The uneven portion can be formed by applying a matte process to the one surface or by attaching a label to a part of the one surface.

Finally, the fourth invention of the present application is a magnetic disk cartridge that can be loaded into a disk drive, wherein the magnetic disk cartridge includes a magnetic disk and a housing that rotatably accommodates the magnetic disk. A means for forming an emetic layer containing an emetic agent as a main component on at least a part of the surface of the housing and / or amplifying a foreign body sensation when a magnetic disk cartridge is put in the mouth. It is characterized in that it is provided.

[0040] The emetic layer may be provided on a part of the surface of the housing, or may be provided on the entire surface of the housing. Further, a protective layer may be provided on the emetic agent layer so as to partially cover the emetic agent layer. Further, a means for amplifying the feeling of foreign matter when the magnetic disk cartridge is put in the mouth can be provided, for example, by performing a jagged process on the edge of the housing.

[Effect of the Invention] According to the first invention of the present application, the housing is circumscribed in an arc along the contour of the magnetic disk and a circle along the contour of the magnetic disk, and is orthogonal to each other. By having an outer edge shape formed of a straight line, when it is inserted into a disk drive, it can be reliably positioned with respect to the disk drive in a predetermined direction.

[0042] In particular, the dimensions of the two side walls extending along the two straight lines orthogonal to each other of the housing in the direction parallel to the rotation axis of the magnetic disk are larger than the thickness of the magnetic disk housing portion of the housing. In particular, when the upper edges of the two side walls protrude from the upper surface of the face plate portion of the housing, and / or the outer surface of the two side walls, which is adjacent to the outer surface of the two side walls, draws an arc along the contour of the magnetic disk. If the disk cartridge is projected outward from the outer line of the outer peripheral surface of the disk, the correct insertion direction for the front and back of the disk cartridge and the disk drive can be immediately identified by simply picking the disk cartridge by hand, and the disk drive side can be identified. By making the shape of the carriage insertion slot correspond to the protruding shape of the above two side walls, it is possible to prevent the disk cartridge from being inserted into this slot if it is oriented in the wrong direction, and to prevent erroneous insertion more reliably. it can.

[0043] Further, since the housing corner portion defined by the above two side walls is located at a position away from the outer periphery of the magnetic disk, a positioning reference hole for vertically penetrating the housing may be provided at this corner portion, or For example, an identification piece capable of reading information by reflection, transmission or transmission of a specific wavelength can be embedded in the housing later, and in that case, the recording capacity or the like can be identified by this identification piece. There is also the advantage that the housing can be shared.

[0044] Further, the housing is composed of a lower shell and an upper shell fitted inside the lower shell from above, and all the components constituting the magnetic disk cartridge are contained in the lower shell. When assembled by a stacking method, it is possible to obtain a disk cartridge that is ultra-compact and has excellent assembleability.

According to the second invention of the present application, a magnetic disk cartridge is inserted into the disk drive and locked at a predetermined position in the disk drive on the trailing side with respect to the insertion direction of the housing into the disk drive. By providing an urging means for urging the magnetic disk cartridge in the ejection direction, play is prevented when the magnetic disk cartridge is inserted into the disk drive and locked in a predetermined position in the disk drive. be able to.

[0046] Further, since the urging means for urging the magnetic disk cartridge in the ejection direction is provided, when the magnetic disk cartridge is released from the locking in the disk drive, the urging force of the urging means is used. Since it is pushed out in the ejection direction, there is an advantage that the separation from the disk drive is improved and the ejection becomes easy.

[0047] When the urging means is configured to utilize the elastic restoring force of the leaf spring portion integrally provided on the side wall of the housing, the cartridge insertion slot that can achieve the purpose with a simple configuration. By matching the shape of the above two side walls with the protruding shapes of the two side walls, it is possible to prevent the disc cartridge from being erroneously inserted.

[0048] According to the third invention of the present application, by providing an uneven portion on at least one surface of the front and back surfaces of the housing so that this surface can be distinguished from the other surface, it is possible to touch (feel). The presence of the uneven portion can be recognized, and thus the front and back surfaces can be identified more accurately. Therefore, even if the entire surface of the magnetic disk cartridge is covered with fingers and the front and back cannot be visually confirmed when the magnetic disk cartridge is picked up with a finger, the front and back of the magnetic disk cartridge can be identified by touch. Therefore, it is possible to prevent an error of inserting the magnetic disk cartridge into the disk drive by mistake on the front and back.

[0049] It should be noted that which of the front and back surfaces has the uneven portion, or which surface should be aligned with the front surface of the disk drive, is clearly determined on the disk drive side or the electronic device side using the disk. Of course, it is necessary to instruct.

[0050] According to the fourth invention of the present application, the emetic agent layer containing the emetic agent as a main component is formed on at least a part of the surface of the housing, and / or the magnetic disk cartridge is put in the mouth. By providing a means to amplify the feeling of foreign body sensation at the time, when it is accidentally or playfully put in the mouth or licked, the stimulus has the effect of unknowingly exhaling it from the mouth. Therefore, it is possible to prevent accidental ingestion and accidental ingestion of infants. In addition, since it can be immediately exhaled by stimulation, it is possible to prevent a situation in which saliva or the like adheres to the recording surface and causes an important recording / reproduction error.

[0051] The magnetic disk cartridge according to the present invention is particularly suitable for use in a digital camera, is not only convenient to handle, but also can be manufactured at low cost because it is a magnetic disk, and the recorded disk cartridge can be stored as it is. You will be able to use it to do things or give it to others.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of a magnetic disk cartridge according to the present invention will be described with reference to the drawings.

FIG. 1 is electrically connected to and loaded into the socket 4 of the receiving portion of the PC card 2 inserted into the slot for the PC card provided in the personal computer similar to that shown in FIG. 14 (a). The disk drive 6 to be used and the magnetic disk cartridge according to the present invention inserted into the disk drive 6 are shown. The disk cartridge 10 is a high recording density magnetic recording medium using barium ferrite powder in a flat housing 12. A flexible disk-shaped magnetic disk 14 is preferably rotatably housed, and the housing 12 is a rotary shutter 35 that opens and closes an opening for allowing the magnetic head of the disk drive 6 to access the surface of the magnetic disk 14. It also has a planar shape consisting of an outer edge having a shape consisting of a circle along the contour of the magnetic disk 14 and the tangent lines of the two circles intersecting each other at right angles.

The detailed configuration of the magnetic disk cartridge 10 schematically shown in FIG. 1 is shown in FIGS. 2 to 5, and FIG. 2 shows the magnetic disk cartridge 10 of the disk drive 6 into which the cartridge 10 is inserted. A perspective view seen from above together with a part, FIG. 3 is a perspective view of the magnetic disk cartridge 10 viewed from below, FIG. 4 is a perspective view showing a state in which the shutter is opened corresponding to FIG. 2, and FIG. 5 is an exploded perspective view. Is.

[0055] The magnetic disk cartridge 10 has a housing 12 composed of a metal lower shell 20 and a metal upper shell 30 fitted inside the lower shell 20 from above, as shown in FIG. As shown, the metal shutter 25 on the lower shell 20 side is built into the lower shell 20, the metal shutter 35 on the upper shell 30 side is located outside the upper shell 30, and all components are inside the lower shell 20. It can be assembled by stacking method.

As is clear from FIG. 5, the lower shell 20 includes a bottom plate 20a that defines the planar contour of the housing 12 and a side wall that rises upward from the peripheral edge of the bottom plate 20a except for the portion of the opening 24 described later. Of the side walls, the side walls 21 and 22 rising from the straight corner outer edges along the two circumscribed lines of the bottom plate 20a have their upper edges protruding from the upper surface of the upper shell 30 and the lower edges of the lower shell 20. The erroneous insertion prevention wall is formed by aligning with the lower surface of the wall and having both ends protruding slightly outward from the circumscribed line of the side wall (peripheral wall) 20b forming the circumferential surface adjacent to the side wall (peripheral wall).

[0057] One side wall 21 is formed so as to be orthogonal to the insertion direction at a corner on the trailing side with respect to the insertion direction of the disk cartridge 10 into the disk drive 6, and the other side wall 22 is parallel to the insertion direction. Is formed in. The end on the reading side with respect to the insertion direction of the side wall 22 into the disk drive 6 forms an insertion positioning step 22a with respect to the disk drive 6. Further, in the corner portion of the housing 12 defined by the side walls 21 and 22, a hole 16 is formed through the upper and lower shells 30 and 20 in a direction substantially parallel to the rotation axis of the magnetic disk 14, and a hole 16 on the lower shell 20 side is formed. 16 is the positioning reference hole.

A center core 15 is fixed to the central portion of the magnetic disk 14, and a central hole 23 is formed in the central portion of the bottom plate 20a of the lower shell 20 so that the bottom surface of the center core 15 faces the outside. An annular wall 20c that rotatably supports the annular portion 25a of the lower shutter 25, which will be described later, is coaxially formed on the upper surface around the central hole 23, and the annular wall 20c has a flat upper surface. On the upper surface, a smaller diameter annular wall 20d for supporting the central portion of the lower sliding sheet 28, which will be described later, is coaxially formed. These large and small annular walls 20c and 20d can be formed by squeezing the bottom plate 20a. An annular wall (not shown) is also formed by squeezing around the positioning reference hole 16 formed at the corner of the bottom plate 20a of the lower shell 20.

[0059] Further, the lower shell 20 has a fan-shaped opening 24 on the side opposite to the positioning reference hole 16 side with respect to the center hole 23 for allowing the magnetic head described later of the disk drive 6 to access the surface of the magnetic disk 14. Is formed around the central hole 23 over a predetermined angular range, and a rotary lower shutter 25 that opens and closes the opening 24 is arranged inside the lower shell 20.

[0060] The lower shutter 25 is radiated from the central annular portion 25a rotatably supported by the annular wall 20c of the lower shell 20 and the annular portion 25a over an angle range larger than the opening 24. It is composed of a fan-shaped main plate portion 25b extending to the surface and a vertical plate portion 25c bent upward at a substantially right angle along the arc-shaped outer edge of the main plate portion 25b.

[0061] On the other hand, the upper shell 30 hangs downward from the peripheral edge of the top plate 30a except for the top plate 30a, which is substantially similar in shape to the bottom plate 20a of the lower shell 20 and is slightly smaller, and the portion of the opening 34 described later, and the lower shell An opening for allowing the magnetic head of the disk drive 6 to access the surface of the magnetic disk 14 at a position corresponding to the opening 24 of the lower shell 20 with a peripheral wall 30b elastically fitted inside the peripheral wall 20b of the 20. A 34 is formed, and an upper shutter 35 for opening and closing the opening 34 is provided on the outside of the upper shell 30.

[0062] Further, in the corner portion where the outer edge is defined by two straight lines orthogonal to each other of the upper shell 30, for example, light is adjacent to the hole 16 corresponding to the positioning reference hole 16 on the lower shell 20 side. A hole 17 is formed in which an identification piece 18 capable of reading information by reflection, transmission, or transmission of a specific wavelength can be embedded later. An annular wall (not shown) is formed on the lower surface around the hole 16 by drawing.

[0063] The upper shutter 35, which has a shape substantially similar to that of the lower shutter 25, has a central annular portion 35a, a fan-shaped main plate portion 35b extending in the radial direction from the annular portion 35a, and an arc-shaped outer edge of the main plate portion 35b. It is provided with a vertical plate portion 35c that is bent downward at a substantially right angle along the above, and is further cut upward from the outer end of the main plate portion 35b on the reading side in the shutter opening direction in order to open the shutters 25 and 35. It is equipped with a working projectile 35d.

[0064] The upper edge of the shutter operating projecting piece 35d is defined to be substantially the same height as the upper edges of the corner side walls 21 and 22 of the housing 12 after assembly. By doing so, it is possible to prevent the cartridges 10 from tilting when the plurality of cartridges 10 are stacked in a horizontal state.

[0065] Then, in order to rotatably accommodate the vertical plate portions 25c and 35c connected to each other at the time of assembly as described later, the rotation ranges of the shutters 25 and 35 are provided on both sides of the opening 24 of the lower shell 20. Peripheral walls 26,27 protruding outward in the radial direction over a range are formed, and recesses 26a, 27a are formed inside these peripheral walls 26,27. In FIG. 2, these recesses 26a and 27a appear as arcuate grooves.

[0066] Further, a recess 36 (see FIG. 5) is formed on the upper surface of the top plate 30a of the upper shell 30 to accommodate the annular portion 35a and the main plate portion 35b of the shutter 35 and to allow the shutter 35 to rotate. A circular convex portion 37 for rotatably supporting the annular portion 35a of the shutter 35 is formed in the central portion of the concave portion 36. When the annular portion 35a of the shutter 35 is pivotally supported by the circular convex portion 37, the main plate portion 35b of the shutter 35 is in contact with the bottom surface of the concave portion 36, and the vertical plate portion 35c is arcuate on both sides of the opening 34 of the upper shell 30. It covers the outside of the peripheral wall 30b. Further, on the upper edge of the vertical plate portion 25c of the lower shutter 25 and the lower edge of the vertical plate portion 35c of the upper shutter 35, the upper shutter 35 is moved up after the upper shell 30 is fitted to the lower shell 20. An engaging portion (not shown) that engages with each other is formed by placing it on the shell 30 and applying a force from above, and this engagement is configured to integrate the upper and lower shutters 35 and 25. ing.

[0067] The magnetic disk cartridge 10 has a feature that all the components can be assembled on the lower shell 20 in a stackable manner. Next, the magnetic disk cartridge 10 is described together with the description of the components other than the above-mentioned components. The method of assembling the magnetic disk cartridge 10 will be described with reference to FIG.

[0068] First, the annular portion 25a of the lower shutter 25 is fitted to the annular wall 20c of the bottom plate 20a of the lower shell 20. In this case, the shutter 25 is in a closed position where the main plate portion 35b closes the opening 24 of the lower shell 20 so that the vertical plate portion 25c is in contact with the inner wall surfaces of the recesses 26a and 27a on both sides of the opening 24. Next, the lower sliding sheet 28 is arranged. The sliding sheet 28 has a shape substantially similar to the bottom plate 20a of the lower shell 20, and has a fan-shaped opening 28a extending outward from the central hole and a corner portion defined by two straight lines orthogonal to each other. The central hole is fitted into the annular wall 20d of the bottom plate 20a of the lower shell 20 and supported by the flat top surface of the lower annular wall 20c. The sliding sheet 28 has a hole 28b at its corner that matches the positioning reference hole 16 formed in the bottom plate 20a of the lower shell 20, and is formed in this hole 28b around the positioning reference hole 16 of the lower shell 20. Fit the ring wall to support the corners of the sliding sheet 28.

Next, a magnetic disk 14 having a center core 15 is arranged, and further, an upper sliding sheet 38 having an opening 38a and a hole 38b at a corner and formed in the same shape as the lower sliding sheet 28 is arranged. Then, the peripheral wall 30b of the upper shell 30 is fitted inside the peripheral wall 20b of the lower shell 20. As a result, the vertical plate portion 25c of the shutter 25 in the recesses 26a, 27a can move along the groove in the groove formed by the recesses 26a, 27a and the peripheral wall 30b of the upper shell 30. Further, the annular wall of the hole 16 formed at the corner of the top plate 30a of the upper shell 30 is fitted into the hole 38b at the corner of the upper sliding sheet 38 to support the corner of the sliding sheet 38 and to support the upper and lower sides. The corners of the sliding sheets 28 and 38 of the upper shell 30 are also supported by the inner wall surface of the side wall of the corner of the upper shell 30.

[0070] Next, the upper shutter 35 is assembled in such a manner that the annular portion 35a is pivotally supported by the circular convex portion 37 on the upper surface of the upper shell 30, and the vertical plate portion 35c thereof is attached to the vertical plate portion of the lower shutter 25. Combine with 25c to integrate shutters 25 and 35. Next, a flat spiral spring 40 for urging the shutter is fitted into the circular convex portion 37, the inner end 40b of the spiral spring 40 is engaged with the slit 37b of the circular convex portion 37, and the outer end 40a is the shutter 35. By locking the notch 35e of the main plate portion 35b, the shutters 25 and 35 are urged in the closing direction and held in the closed position.

Next, a metal cover plate 41 having an opening 41a that follows the opening 34 of the upper shell 30 and having a diameter larger than the recess 36 of the upper shell 30 is centered as shown by a broken line 41b in FIG. By adhering the portion on the circular convex portion 37 of the upper shell 30 and adhering the peripheral portion on the top plate 30a of the upper shell 30, the spiral spring 40 is prevented from coming off and the shutter is placed on the lower surface side of the cover plate 41. The rotation space of 35 is defined, and the assembly of the disc cartridge 10 is completed by the above.

By making the upper surface of the cover plate 41 an uneven surface, the front and back surfaces of the disc cartridge 10 can be visually identified by touch. This uneven surface can be formed, for example, by applying a matte process to the upper surface of the cover plate 41, and by this matte process, numbers and the like can be written with a pencil. Alternatively, as shown in the drawing, an uneven surface may be formed by attaching, for example, a paper circular label 42 to a part of the upper surface of the cover plate 41. In this case, not only information can be written on the label 42, but also a perforation 42a along the contour of the opening 41a of the cover plate 41 is provided on the label 42, and the area 42b surrounded by the perforation 42a at the time of use is provided. By cutting it out, it is possible to provide a virgin guarantee for the unused cartridge 10, and also to protect the exposed upper shutter 35. Alternatively, a fluorescent paint may be applied to the upper surface of the cover plate 41 so that the front and back surfaces of the disc cartridge 10 can be identified even in the dark.

[0073] In order to elastically fit the peripheral walls 30b and 20b of the upper and lower shells 30 and 20, one of the peripheral walls 30b and 20b, for example, the peripheral wall 30b is provided with a plurality of slits 39 as shown in the drawing. Therefore, it is preferable to give elasticity to the peripheral wall 30b. Further, on the upper surface of the main plate portion 25b of the lower shutter 25 and the lower surface of the main plate portion 35b of the upper shutter 35, the magnetic disk 14 rotating through the openings 34 of the upper shell 30 and the openings 28a and 38a of the sliding sheets 28 and 38 Cleaning members 44 that come into contact with the surface are attached radially. The cleaning members 44 are radially attached along the closing edges of the main plate portions 25b, 35b of the shutters 25, 35, and these cleaning members 44 are attached to the magnetic disk 14 when the magnetic disk 14 is stationary. It also has a function of preventing the shutters 25 and 35 from coming into contact with the main plate portions 25b and 35b.

[0074] Further, when the shutters 25 and 35 are opened and the magnetic disk 14 is rotating, if the cleaning member 44 is in contact with only one place on the surface of the magnetic disk 14, the balance during rotation of the magnetic disk 14 Therefore, on the surface of the sliding sheets 28 and 38 provided for protection of the magnetic disk 14 facing the magnetic disk 14, a ridge 45 having the same height as the cleaning member 44 is attached to the cleaning member when the shutter is opened. It is preferable to provide them radially at a position deviated by 180 degrees with respect to 44. Further, each of the two ridges 45 may be provided radially at a position deviated by 120 degrees with respect to the cleaning member 44 when the shutter is opened.

FIG. 6 is a schematic plan view showing a state when the magnetic disk cartridge 10 is inserted into the disk drive 6, and FIG. 7 is a schematic plan view showing a state in which the magnetic disk cartridge 10 is mounted on the disk drive 6. It is a figure. Note that FIGS. 6 and 7 are provided for explaining the relative positional relationship between the magnetic disk cartridge 10 and the disk drive 6, and details are omitted.

[0076] The disk drive 6 includes a cartridge insertion slot 6a and an internal cartridge storage space 7, and is normally retracted outside the insertion passage of the cartridge 10 (the edge of the passage is indicated by a broken line L). As the cartridge 10 is inserted into the disk drive 6 and the head assembly 50 having a pair of upper and lower rotating arms 51, the shutters 25 and 35 are engaged with the working projection 35d of the shutter 35. It is provided with a shutter operating member 52 for opening and operating. Magnetic heads 53 are fixed to the tips of the arms 51 so as to face each other, and are configured to access both sides of the magnetic disk 14.

[0077] Further, the cartridge insertion slot 6a is formed in contact with the side wall surface 6b on the side opposite to the head assembly 50 side of the disk drive 6, and the side wall 22 of the magnetic disk cartridge 10 is inserted and positioned on the side wall surface 6b. A positioning protrusion 6c that engages with the step portion 22a is formed. Further, as shown in FIG. 2, the upper edge portion of the cartridge insertion slot 6a corresponds to the upper edge portion of the side wall 22 of the magnetic disk cartridge 10 and the operating protrusion 35d of the shutter 35 in the closed position. Notches 6g and 6h that allow these passages are formed at the positions to prevent erroneous insertion of the magnetic disk cartridge 10.

[0078] The magnetic disk cartridge 10 is inserted into the disk drive 6 from the direction indicated by the arrow in FIG. 6, and at that time, the shutter operating member 52 of the disk drive 6 is attached to the operating projecting piece 35d provided on the shutter 35. When engaged, the shutters 25 and 35 are opened as the magnetic disk cartridge 10 is inserted. In that case, since the operating protrusion 35d of the upper shutter 35 is provided on the right side with respect to the insertion direction of the magnetic disk cartridge 10, the magnetic disk cartridge is inserted from the shutter operating member 52 as the magnetic disk cartridge 10 is inserted. A force F is applied to 10 to rotate it clockwise in the figure, but the side wall 22 extending linearly at the corner of the housing 12 comes into contact with the inner wall surface 6b of the disk drive 6 and rotates. It is supposed to be blocked. Then, as shown in FIG. 7, when the magnetic disk cartridge 10 is completely inserted into the disk drive 6, a positioning protrusion (not shown) provided in the disk drive 6 engages with the positioning reference hole 16, and further, it is necessary. A positioning protrusion (not shown) on the disk drive 6 side is engaged in the positioning recess 22b formed on the side wall of the housing 12, and the magnetic disk cartridge 10 is locked at a predetermined position in the disk drive 6. Then, the arm 51 of the head assembly 50 rotates counterclockwise in the drawing, and the magnetic head 53 accesses both sides of the magnetic disk 14.

As is clear from the above description, in the magnetic disk cartridge 10 of the present embodiment, the housing 12 is a circle along the contour of the magnetic disk 14, and the circumscribed circles of the two circles intersecting each other at right angles. By having a flat shape having an outer edge having a shape consisting of a line, when it is inserted into the disk drive 6, it can be reliably positioned with respect to the disk drive 6 in a predetermined direction.

[0080] In particular, the outer surfaces of the two side walls 21, 22 extending linearly along the two circumscribed lines of the housing 12 intersecting each other at right angles draw a circle along the contour of the adjacent magnetic disk 14. Since the upper edges of the two side walls 21 and 22 project slightly outward from the circumscribed line of the outer peripheral surface of the peripheral wall 20b and protrude from the upper surface of the face plate portion of the housing 12, the disk cartridge 10 is simply picked by hand. Allows you to identify the correct insertion direction for the front and back of the disk cartridge 10 and the disk drive 6.

[0081] That is, since the side wall 21 exists at a position that is the end on the trailing side with respect to the insertion direction of the disk cartridge 10 into the disk drive 6, the orientation of the disk cartridge 10 in the front-rear direction can be easily identified. Further, since the upper edges of the side walls 21 and 22 project from the upper surface of the face plate portion of the housing 12, the lower edge is aligned with the lower surface of the lower shell 20, so that the orientation of the disc cartridge 10 in the front-back direction can be easily identified.

[0082] In addition, since the above-mentioned notches 6g and 6h (see FIG. 2) are formed on the upper edge of the cartridge insertion slot 6a, the orientation of the magnetic disk cartridge 10 in the front-back and front-back directions is generally correct. When inserted in the wrong direction, such as slightly rotated in the direction of disk rotation, the upper edge of the side wall 22 and the working projection 35d of the shutter 35 cannot pass through the notches 6g and 6h, respectively. Accidental insertion is prevented.

[0083] Further, since an uneven portion that makes this surface distinguishable from the other surface is provided on at least one surface of the front and back surfaces of the housing 12, the uneven portion can be recognized by tactile sensation. The front and back can be identified more accurately. Therefore, when the magnetic disk cartridge 10 is picked up by a finger and inserted into the disk drive 6, it is possible to prevent the magnetic disk cartridge 10 from being inserted by mistake on the front and back sides.

[0084] Further, since the housing corner portion defined by the two side walls 21 and 22 is located at a position away from the outer periphery of the magnetic disk 14, a positioning reference hole 16 penetrating the housing up and down is provided at this corner portion. An identification piece 18 that can be provided or, for example, can read information by reflecting, transmitting light, or transmitting a specific wavelength can be embedded in the housing 12 later. In that case, the recording capacity or the like is identified by this identification piece. There is also an advantage that the housing can be shared because it can be used.

[0085] Further, the housing 12 is composed of a lower shell 20 and an upper shell 30 fitted inside the lower shell 20 from above, and all the components constituting the magnetic disk cartridge 10 are Except for the cover plate 41, which is adhered to the circular recess 37 of the upper shell 30, all of them are assembled by fitting in the lower shell by a stacking method, so that they are ultra-compact and have excellent assembleability. It has the advantage of being.

[0086] Further, in the present embodiment, since the lower shell 20, the upper shell 30, the cover plate 41 and the shutters 25, 35 are all made of metal, and the assembly thereof is performed in a stacking manner, the metal material is used at the time of disposal. It is easy to separate and dispose of and other plastic materials, and it also has the effect of preventing environmental pollution.

Next, FIGS. 8 to 10 are views showing an embodiment in which a part of the structure of the magnetic disk cartridge 10 described above is modified, and FIG. 8 is a perspective view corresponding to FIG. 2, FIGS. 9 and 10. Is a schematic plan view corresponding to FIGS. 6 and 7, respectively.

[0088] In the present embodiment, as is clear from FIGS. 8 and 10, the disk cartridge 10 is formed so as to be orthogonal to the insertion direction at the corner on the trailing side with respect to the insertion direction of the disk cartridge 10 into the disk drive 6. A leaf spring portion 21a is formed on the upper portion of the side wall 21 which is horizontally cut from an end portion opposite to the corner portion side. As shown in FIG. 9, the free end of the leaf spring portion 21a is displaced toward the center of the housing 12, and a force is applied to the leaf spring portion 21a in a direction corresponding to the side wall 21. By adding the leaf spring portion 21a, the leaf spring portion 21a is elastically bent to generate an urging force.

[0089] Since the present embodiment has the same structure as the above-described embodiment except that the leaf spring portion 21a is formed on the upper portion of the side wall 21, it overlaps with the bottle if the internal structure is shown. Although the description is omitted, in the present embodiment, as shown in FIG. 9, the leaf spring portion 21a of the side wall 21 of the housing 12 is the disk drive 6 just before the end of the insertion stroke of the magnetic disk cartridge 10 into the disk drive 6. By elastically contacting the outer wall surface 6d of the upper edge of the cartridge insertion slot 6a, the leaf spring portion 21a is elastically flexed, and the magnetic disk cartridge 10 is completely inserted into the disk drive 6. , As shown in FIG. 10, the leaf spring portion 21a coincides with the side wall 21, and in this state, a positioning protrusion (not shown) provided in the disk drive 6 engages with the positioning reference hole 16, and further, if necessary, the housing. A positioning protrusion (not shown) on the disk drive 6 side is engaged in the positioning recess 22b formed on the side wall 22 of the twelve, and the magnetic disk cartridge 10 is locked at a predetermined position in the disk drive 6. Then, the arm 51 of the head assembly 50 rotates counterclockwise in the drawing, and the magnetic head 53 accesses both sides of the magnetic disk 14.

[0090] In this state, the magnetic disk cartridge 10 is urged in the discharge direction by the elastic restoring force of the leaf spring portion 21a. Further, the elastic restoring force of the leaf spring portion 21a of the magnetic disk cartridge 10 is urged in the discharge direction, so that when the magnetic disk cartridge 10 is released from the locking when the disk drive 6 is taken out, the magnetic disk The cartridge 10 is pushed out in the discharge direction by the elastic restoring force of the leaf spring portion 21a.

As is clear from the above description, in the present embodiment, the disk drive 6 is in a state where the magnetic disk cartridge 10 is urged in the discharge direction by the elastic restoring force of the leaf spring portion 21a of the housing 12. By being locked at a predetermined position inside, the disk drive 6 is held in a predetermined position in a state where play is eliminated, and the distance from the disk drive 6 is improved.

[0092] As the urging means for urging the magnetic disk cartridge 10 in the discharge direction, a means other than the leaf spring portion 21a may be used.

[0093] FIGS. 11 to 12 below are partial cross-sectional views showing a state in which an emetic agent layer 61 containing an emetic agent as a main component is formed on the surface of the housing 60 of the magnetic disk cartridge.

As shown in FIG. 11, the magnetic disk cartridge of the present embodiment may have an emetic agent layer 61 containing an emetic agent as a main component formed on the entire surface of the housing 60. , As shown in FIG. 12, an emetic layer 61 containing an emetic agent as a main component is formed on the entire surface of the housing 60, and the emetic layer 61 is partially covered on the emetic layer 61. The protective layer 62 may be formed on the surface.

[0095] Further, as shown in FIG. 13, a structure may be provided in which a jagged portion 63 is provided at the edge portion of the housing 60 so as to amplify a foreign body sensation when the cartridge 10 is put into the mouth. Further, the housing 60 of the cartridge 10 having the structure shown in FIG. 13 may be further provided with an emetic agent layer or a protective layer containing an emetic agent as a main component.

[0096] In order to prevent the emetic agent from adhering to the user's hands, fingers, etc., the emetic agent layer is partially covered on the emetic agent layer provided on the surface of the housing as shown in FIG. It is more preferable to provide the protective layer 62.

[0097] In such a protective layer 62, an emetic agent coating solution containing an emetic agent as a main component is applied to the entire surface of the housing, or the emetic agent is contained in the resin constituting the housing. (In this case, strictly speaking, the emetic layer is not formed on the surface of the housing, and the housing itself has a structure that also serves as the emetic layer. However, the emetic layer of the present invention has a structure. After that, a protective layer that partially covers the emetic layer can be provided on the emetic layer by coating, flat netting, or printing on a silk screen or the like.

[0098] By partially forming a protective layer on the emetic layer formed on the surface of the housing in this way, when the emetic-processed cartridge is eaten or licked, the emetic layer is formed. When the cartridge with this emetic treatment is picked up, the emetic agent contained in the emetic layer is applied to the hands, fingers, etc. due to the presence of the protective layer. It is possible to prevent transfer and adhesion, and since the protective layer is partially formed, the friction coefficient on the surface of the protective layer can be reduced and the slipperiness in the transport path can be improved.

[0099] Both FIGS. 11 and 12 show a case where the emetic layer is provided on the entire surface of the housing, but there is a portion where the emetic layer is not provided on a part of the housing surface. There is no problem. To form a portion of the housing surface that is not provided with an emetic layer, for example, by including an emetic agent in the pigment of the printing ink and partially printing the housing surface with this ink, or It can be formed by applying an emetic agent coating solution containing an emetic agent as a main component to a partially masked housing surface, and then removing the mask.

[0100] The area ratios of the portion of the surface of the housing where the emetic layer is not provided and the protective layer are preferably in the range of 50 to 75% with respect to the surface area of the emetic layer. By setting the area ratio of the part without the emetic layer and the area ratio of the protective layer within this range, when the emetically processed cartridge is contained in the mouth or licked, the emetic contained in the emetic layer is contained. The agent is sufficiently discharged, and the stimulus of the emetic agent causes unconscious vomiting from the mouth, which can prevent accidental ingestion and accidental ingestion. In addition, since it can be immediately exhaled by stimulation, it is possible to prevent a situation in which saliva or the like adheres to the recording surface and causes an important recording / reproduction error.

[0101] The emetic agent is not particularly limited as long as it has an emetic effect when it is taken in the mouth, and for example, a bitter emetic agent, a pungent emetic agent, a sour emetic agent and the like can be used. From the viewpoint of emetic action, bitter emetics are considered to be particularly effective.

[0102] The type of the raw material of the bitterness emetic agent is not particularly limited, but for example, a water extract of a plant, a fungus or the like containing a bitterness component is suitable, and further, if the compounding purpose thereof is taken into consideration. , Food additives, etc. are desirable, and plants containing such bitterness components include, for example, Kuwa family plants, Akane family plants, Tsubaki family plants, Sarnokoshikake order plants, Rose family plants, and Mikan family. More specific spices such as plants, Lindou family plants, Aogiri family plants, Nigaki family plants, Kiku family plants, bearer fungi, Tsuzurafuji family plants, bread yeast, perilla family plants, Asa family, Seri family, etc. can be mentioned. For example, hop flowers (Kuwa family), coffee beans (seed), Shinkonasakushirubura bark (Akane family), Tamaro, brewed tea, Bancha, mate tea and other tea leaves (Tsubaki family), Kawaratake Offspring, mycelium, mannentake offspring, mycelium (Sarnokoshikake), Kirajasaponaria bark (Rose family), Kihada or its similar plant bark, Daidai bark, Grapefruit bark and seeds (Mikan family), Gentian roots and rhizomes (Lindauidae), cacao beans, cola seeds (Aogiri family), nigaki bark and wood (Nigaki family), whole nigga yomogi, yomogi stalks, leaves (Kiku family), Himematsutake Offspring, mycelium (bearing fungus), stems of Tsuzurafuji family plants, stems of Enmeisou, leaves (Shiso family), spices Asa seeds (Asa family), root mass and resin of Asafeteida, Ajowan seeds, Anis ( Seri family) and the like.

[0103] Specific components of the bitter emetic agent include, for example, compounds such as terpenes, xanthin derivatives, alkaloids, terpene glycosides, and triterpenoid derivatives, and specifically, for example, denatonium benzoate. Eight acetylated sugar, hops, caffeine, kawaratake extract, kiku extract, kihada extract, spice extract, himematsutake extract, leishi extract, narindine enzyme treated product, dimethoxtrikinine bursin (bursin), humron Lupron, isophumron, luptorion, natural caffeine, synthetic caffeine, kinin, kinidine, cinconin, tannin, kiraya saponin, kiraya sapogenin, kiraya acid, velverin, gentiopicrin, limonin, theobromine, naringin, flavanone, cassiin, neo-cassiin, Nigakilactones A to L, Nigaquinone, Piclasin A to G, Methyl Nigaquinone, Absintin, Bolapetside, Bolaptor, Methylthioadenosine, Caffeine and the like can be preferably used.

[0104] When a water extract from the above-mentioned plant or the like is used for these bitter taste emetic components, the extraction method is not particularly limited, and a known water extraction method can be adopted. For example, logs and the like are dried. After crushing, water to boiling water is added to extract the necessary components, the extract is filtered, purified as necessary, and then the extract is concentrated to precipitate the extract, and the dried product is used as it is or standardized. Can be mentioned as a method of making a bitter taste emetic substance.

[0105] Further, as the bitterness emetic agent, amino acids such as 4- (2-carboxy-2-hydroxy-ethylthio) -2-piperidincarboxylic acid represented by the following chemical formula exhibiting bitterness extracted from sea urchin ovary are also used. be able to.

[0106] [Chemical formula 1]<img file="JP3919084B2_D0001.tif" />The above compound has two carboxyl groups, one of which and both of them are esterified with a lower alkyl group such as a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group and a tertiary butyl group. May be. Further, the above compound may be an isomer, and may be an alkali metal such as sodium, potassium, magnesium or calcium, an alkaline earth metal, other typical metals, or an inorganic ion such as a transition metal such as iron, cobalt or nickel. It may be a salt with a base such as ammonium, isopropylamine, triethylamine, pyridine and the like.

[0107] These bitter emetic substances can be used alone or in combination of two or more as appropriate. In particular, denatonium saccharides (Vitrex (Macfarlan Smith)) have a large bitter-emetic effect, do not affect fragrance or color, and do not change stability in the presence of fragrances, pigments, or activators. Denatonium benzoate such as Super Vilex (manufactured by Burlington Biomedical &amp; Science), and dimethoxtrikinine brucine (brucine) can be preferably used.

[0108] The bitterness emetic agent is preferably contained in the range of 0.005 (50 ppm) to 5% by weight, more preferably 0.01 to 1% by weight, based on the total amount of the emetic agent coating solution.

[0109] In order to enhance the bitterness, the bitterness emetic agent may contain a predetermined amount of a substance that imparts sweetness to the bitterness emetic substance. The type of sweetening substance to be combined with the bitterness emetic is not particularly limited, but considering the purpose of blending, sweeteners, pharmaceutical additives and food additives used as flavoring agents for imparting sweetness, etc. Is preferable, for example, aspartame, amacha, amacha powder, aminoacetic acid, isomerized sugar, liquid glucose, liquid sugar, fructose, reduced maltose water candy, kanzo, kanzo extract, kanzo crude extract, kanzo powder, xylitol, (concentrated). Glycerin, dipotassium glycyrrhizinate, disodium glycyrrhizinate, monoammonium glycyrrhizinate, brown sugar, high glucose water candy, saccharin, sodium saccharin, sanfructo, purified sucrose, purified sucrose spherical granules, purified honey, D-sorbitol, D-sorbitol solution , Simple syrup, lactose, sucrose, honey, glucose, powdered reduced maltose water candy, maltose, maltose, maltrap-70, D-mannitol, water candy, ascorbic acid, L-aspartic acid, sodium L-aspartate, L -Magnetic aspartate, Amacha extract, Aminoethyl sulfonic acid, DL-Alanine, Disodium 5'-inosinate, Uikyo, Uikyo powder, Uikyo oil, Erythritol, Sodium chloride, Magnesium chloride, Hydrochloric acid, Glutamic acid hydrochloride, Eugenol, Oubaku powder , Ohi extract, auren, auren powder, orange, orange oil, cacao powder, gargle micron ZD-3586, caramel, carbacol, dried yeast, d-camfur, dl-camfur, dilute hydrochloric acid, D-xylose, disodium 5'-guanylate , Citric acid, sodium citrate, glycyrrhizinic acid, trisodium glycyrrhizinate, diammonium glycyrrhizinate, glucono-δ-lactone, L-glutamic acid, L-glutamate L-arginine, sodium L-glutamate, chlorella extract, chlorella powder, keihi Powder, maltose oil, monosodium succinate, nina succinate

[0110] Particularly suitable combinations of the bitterness emetic agent and the sweetening substance include, for example, one or more of water extract of Picrasma quass, naringin, synthetic caffeine, natural caffeine and (concentrated) glycerin, D-. Examples thereof include a combination of one or more of sorbitol, D-xylose, and D-mannitol. In order to enhance the bitterness, the sweetness-imparting substance is added to the above-mentioned bitter-emetic substance in a weight ratio of bitterness-emetic substance: sweetness-imparting substance = 1: 10 to 1: 10000, preferably 1: 100 to 1: 10000, more preferably. Is preferably blended so as to be 1: 1000 to 1: 10000.

[0111] Citric acid, tartaric acid, lactic acid, acetic acid, glacial acetic acid, fumaric acid, sodium fumarate, malic acid, adipic acid and the like are used as acid emetics, and piperine, chavicine, capsaicin and α-sanshool are used as spicy emetics. , Β-sanshool, zingerone, chavicaol, isothiocyanate and the like.

[0112] The emetic agent layer containing these emetic agents as a main component may contain an antibacterial agent or an fragrance agent. In addition, these antibacterial agents and fragrances can be contained when forming a protective layer. The action of the antibacterial agent can prevent germs from propagating in the emetic layer and the protective layer. When the protective layer contains an antibacterial agent, in order to obtain a sufficient antibacterial effect while keeping the cost low, the weight of the antibacterial agent varies depending on the type and combination of the antibacterial agent selected, but if the weight of the antibacterial agent is the emetic layer, emetic If it is a protective layer, it is preferably in the range of 0.01 to 10% by weight based on the total amount of the protective layer coating liquid with respect to the total amount of the agent coating liquid.

As the antibacterial agent, known ones can be used. For example, in addition to the trade name Zeomic manufactured by Cinenan, 2- (4-thializol) -benzimidazole, 2-benzimidazole methyl carbamate, 2-( Methoxycarbonyl) benzimidazole, N- (fluorodichloromethylthio) -phthalimide, N, N-dimethyl-N'-(dichlorofluoromethyl) thio-N'-phenylsulfamide, 2-n-octyl-4-isothiazolin- 3-one, 1,2-benzisothiazolin-3-one, bis (2-viridylthio-1-oxide) zinc, bis (2-viridylthio-1-oxide) sodium, 2,3,5,6-titrachloro -4- (Methylsulfonyl) -viridin, 10,10'-oxybisphenoxaarcin and the like can be used alone or in combination of two or more as appropriate.

[0114] Examples of the fragrance component include hydrocarbons such as aliphatic hydrocarbons, terpene hydrocarbons and aromatic hydrocarbons, alcohols such as aliphatic alcohols, terpene alcohols and aromatic alcohols, aliphatic ethers and aromatic ethers. Ethers, aliphatic oxides, oxides such as terpene oxides, aliphatic aldehydes, terpene aldehydes, hydroaromatic aldehydes, thioaldehydes, aldehydes such as aromatic aldehydes, aliphatic ketones, terpene ketones, hydrogen Ketones such as chemical aromatic ketones, aliphatic cyclic ketones, non-benzene aromatic ketones, aromatic ketones, acetals, ketals, phenols, phenol ethers, fatty acids, terpene carboxylic acids, hydrogenated aromatic carboxylics. Acids such as acids and aromatic carboxylic acids, acid amides, aliphatic lactones, cyclic lactones, terpene lactones, hydrogenated aromatic lactones, lactones such as aromatic lactones, aliphatic esters, furan carboxylic acid group esters , Aliphatic cyclic carboxylic acid esters, esters such as aromatic carboxylic acid esters, synthetic fragrances such as nitromusks, nitriles, amines, pyridines, quinoline, pyrrol, indol and other nitrogen-containing compounds, natural from animals and plants. Examples include fragrances, natural fragrances and / or compound fragrances containing synthetic fragrances, which can be used alone or in admixture of two or more.

[0115] More specifically, for example, 1996, published by The Chemical Daily, Inc., by Motokazu Indo (synthetic fragrance chemistry and product knowledge), 1969, by STEFFEN ARCTAMDER (Perfume and Flavor). The fragrances and the like described in Chemicals&gt;) and the like can be preferably used. The amount of the fragrance component to be blended varies depending on the type and combination of fragrances selected, but is 0.1 to 10% by weight, preferably 0.1 to 10% by weight, in the emetic coating solution for the emetic layer and in the protective layer coating solution for the protective layer. It is desirable to add in the range of 0.4 to 8% by weight.

[0116] The adjustment of the coating liquid when the emetic agent layer is applied by coating is conventionally known by mixing an emetic agent, a resin, a solvent if necessary, the above-mentioned antibacterial agent, a fragrance, and other additives. The method, for example, can be carried out by mixing and dispersing the above components with a disperser such as a three-roll mill or a horizontal ball mill.

[0117] As the resin of the coating liquid, known ones can be used, and acrylic resin, vinyl chloride resin, chlorinated polypropylene resin, unsaturated polyester resin, polyurethane resin, acrylic resin, and phenol resin can be used. Alternatively, various resin materials such as urethane-based resins can be used alone or in admixture of two or more.

Known solvents can also be used, such as chain hydrocarbons such as sorbennaphtha, mineral spirit, subindre oil, cyclic hydrocarbons such as xylene, nitrobenzene, decalin, tetraline, cyclohexane, normal propyl alcohols. , Alcohols such as isopropyl alcohol, benzyl alcohol, cyclohexanol, esters such as ethyl acetate, butyl acetate, amyl acetate, amyl benzoate, ether alcohols such as ethyl cellosolve, methyl cellosolve, carbitol, ethylene glycol, propylene glycol, glycerin, etc. Glycol, methyl ethyl ketone, cyclohexanone, mesityl oxide and the like can be used alone or in combination of two or more.

[0119] As other additives, if necessary, a bulking material such as calcium carbonate, a plasticizer such as dibutyl phthalate, tricresyl phosphate, dimethyl sebacate, and waxes such as mokuro, carnauba wax, beeswax, and montan wax petrolatum. -Grease and desiccants such as borate and naphthenate can be used as appropriate.

[0120] Further, in the case where the emetic agent layer is contained in the printing ink and partially printed on the housing surface, in addition to the above, further known pigments such as titanium oxide, zinc oxide, carbon black and iron are used. Black, Aniline Black, Hansa Yellow, Benzijin Yellow, Turtrazine Lake, Permanent Yellow Toner, Cadmium Yellow, Benzidine Orange, Chrome Vermillion, Cadmium Orange, Permanent Orange GTR, First Orange Lake, Lake Red C, Valve Pattern, Watching Red , Brilliant Carmine 6B, Permanent Red F5R, 2B, FRLL, Carmine Lake, Quinacridone Red, Methyl Violet Lake, First Violet B, Quinacridone Violet, Induslen Violet, Phthalocyanine Blue, First Sky Blue, Navy Blue, Ultramarine Blue, Victoria Blue Lake , Phthalocyanine Green, Malakite Green Lake, Pigment Green B, Viridian, Schenner, Amber, Aluminum Powder, Bronze Powder, Fluorescent Pigment, etc., regardless of inorganic pigments or organic pigments.

[0121] As is clear from the above description, this magnetic disk cartridge is erroneously formed by forming an emetic layer 61 containing an emetic as a main component on at least a part of the surface of the housing 60. Or, when you playfully put it in your mouth or lick it, the tongue touches the emetic layer, which makes you feel vomiting, and the stimulus causes you to unconsciously vomit from your mouth. Accidental eating can be prevented. Similarly, when a means for amplifying the foreign body sensation when put in the mouth is provided, it can be immediately exhaled by stimulation, so saliva or the like adheres to the recording surface and is important for recording and reproduction. It is possible to prevent a situation that causes an error.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic explanatory view showing a magnetic disk cartridge according to the present invention together with a disk drive into which the disk cartridge is inserted and an electronic device having a card slot into which the disk drive is inserted. FIG. 2 is a perspective view of an embodiment of the magnetic disk cartridge according to the present invention as viewed from above. FIG. 3 is a perspective view of the magnetic disk cartridge of FIG. 2 as viewed from below. FIG. Perspective view corresponding to FIG. 2 shown with the shutter open [Fig. 5] An exploded perspective view of the magnetic disk cartridge shown in FIG. 2 [Fig. 6] Shows a state when the magnetic disk cartridge shown in FIG. 2 is inserted into a disk drive. Schematic plan view [FIG. 7] Schematic plan view showing a state in which the magnetic disk cartridge of FIG. 2 is mounted on a disk drive [FIG. 8] Corresponds to FIG. 2 of another embodiment of the magnetic disk cartridge according to the present invention. Perspective view [Fig. 9] Schematic plan view showing a state when the magnetic disk cartridge of FIG. 8 is inserted into a disk drive [Fig. 10] Schematic plan view showing a state in which the magnetic disk cartridge of FIG. 8 is mounted on a disk drive. FIG. 11 is a partial cross-sectional view showing a state in which an emetic agent layer containing an emetic agent as a main component is formed on the surface of a housing of a magnetic disk cartridge. [Fig. 12] A protective layer is further formed on the emetic agent layer of FIG. FIG. 13 is a perspective view of a magnetic disk cartridge provided on the surface of a housing as a means for amplifying a feeling of foreign matter when it is put into a mouth. [FIG. 14] A premise of the present invention. Schematic diagram showing a disk drive with an electronic device equipped with a card slot into which this disk drive is loaded [Code description] 6 Disk drive 10 Magnetic disk cartridge 12 Housing 14 Magnetic disk 15 Center core 18 Identification piece 20 Lower shell 21,22 Side wall 21a Side wall spring plate 24,34 Magnetic head access opening 25,35 Shutter 28, 38 Sliding sheet 30 Upper shell 40 Swirl spring 41 Cover plate 42 Label 44 Cleaning member 45 Protrusion 50 Head assembly 51 Arm 52 Shutter actuating member 53 Magnetic head 61 Emetic layer