Improved position structure of push-button for keyboard

Improved keyboard key positioning structure (2)

This creation is related to an improved structure of keys, especially a type of keyboard that is directly connected to the printed circuit board by bridging the keys to form a keyboard that can reduce the production cost and effectively reduce the thickness of the keyboard and is waterproof.

According to the keyboard structure currently seen, it can be as disclosed in Figure 1; it includes: a keycap, an elastic body, a bridge built on the elastic body, an assembly board formed by plastic injection, and a film type It is composed of a circuit board and a base placed under it. Wherein, the assembly board is stamped and formed with pivoting parts for pivoting bridges, so as to be pivotally connected with the movable shafts of the bridges, and finally the keycaps are assembled on the bridges to complete a conventional keyboard structure.

For another type of keyboard structure, please refer to Figure 2; the interior of this keyboard is composed of a keycap, an elastic body, a bridge, a membrane circuit board, and a base. The surface of the base is stamped and formed with a plurality of pivoting parts for pivoting and bridging; when assembling, the film type printed circuit board is first stacked on the base, and then the elastic body is fixed in position, and then the aforementioned pivoting parts are used It is pivotally connected with the movable shaft of the bridge, and finally the keycap is assembled on the bridge to complete another conventional keyboard structure.

From the above two conventional keyboard structures, the following deficiencies can be summarized:

The keyboard structure of the first and second keyboards is to cooperate with the bridge pivot connection, and a certain height and plural pivot parts must be stamped and formed on the assembling board or the base. In addition to increasing the thickness of the keyboard, the stamping process is time-consuming and the production cost is high. , Which causes the trouble that the current keyboard industry cannot make technological breakthroughs.

2. Since the base is a rigid body made of metal, when a more elastic bridge is required to be pivoted, the movable shaft is often bent, deformed or broken and damaged, resulting in a waste of manufacturing cost and resources.

3. When the keyboard is pressed for a long time, the movable shaft of the bridge and the pivotal part of the metal base will rub against each other frequently, which will easily lead to the generation of iron filings and easily fall on the signal transmission circuit. Between the boards, it will cause the circuit board to operate abnormally. In severe cases, the circuit board will be short-circuited and damaged.

4. Because the two printed circuit layers and one insulating spacer layer of the above-mentioned film type printed circuit board are only stacked, there is no closure between them, which often causes the elastomer to be squeezed down by the button, if the user accidentally drops it When water drops in the keyboard, when the elastic body returns from the pressed state to the initial state, a vacuum suction force will be generated so that the moisture dripped into the keyboard will be sucked into the interlayer of the circuit board through the gap of the circuit board, resulting in the printed circuit The board has a short circuit problem.

In view of the above-mentioned deficiencies, this creation provides a pivoting part that is directly extruded on a printed circuit board for the pivoting of the movable shaft for bridging, so as to provide a joint that can reduce the production cost and effectively reduce the thickness of the keyboard and is waterproof. The keyboard is more in line with the economic benefits of the industry, and its purpose is as follows:

The purpose of this creation: This creation is to use the printed circuit board to extrude the pivoting part for the pivoting of the movable axis of the bridge. In addition to improving the high production cost and complicated copying procedures of the above-mentioned assembling board or bottom plate stamping and forming method, Reduce the thickness of the keyboard more effectively.

The second purpose of this creation: The printed circuit board and the pivoting parts on it are made of elastic materials. No matter whether the material of the bridge is rigid or elastic, it will not cause the movable shaft to bend, deform or break during joining. The situation happened. Moreover, when the keyboard is pressed for a long time, there will be no similar conductive iron filings falling to the circuit board, which effectively prevents the short circuit of the circuit board from occurring.

The third purpose of this creation is that the printed circuit layer and an insulating layer of the printed circuit board of this creation are glued together, which can effectively isolate water from entering the interior, and provide a waterproof keyboard that can extend the life of the keyboard. .

The detailed description and technical content of this creation are described as follows in conjunction with the diagrams:

[The best embodiment of this creation]

Please refer to Figures 3 and 7-1 for review members; it is a three-dimensional exploded view and a sectional view of this creation; this creation includes a base made of metal or hard plastic material 5. The aforementioned base 5 is protrudingly provided with a plurality of groups of pivoting portions 40 to define the printed circuit board 4 which surrounds the plurality of groups of connection areas 47, and a group is arranged on the assembling areas 47 of the above-mentioned printed circuit board 4 and on the The end is provided with a bridge 3 with movable shafts 302, 302' that are axially connected to the aforementioned pivoting portion 40, a set of elastic bodies 2 arranged on the above-mentioned bridge 3, and a set of elastic bodies 2 arranged on the elastic body 2 and connected to the ends of the bridge 3 The keycap 1 connected to the positioning shaft 301, through the above-mentioned components, constitutes a keyboard that can reduce the manufacturing cost and effectively reduce the thickness of the keyboard and is waterproof.

The aforementioned bridge 3 includes two frame bodies 30, 30' that are formed by shafting or pivoting. The upper and lower ends of the bridge 3 are provided with positioning shafts 301 assembled with the keycap 1, and movable shafts pivoted with the printed circuit board 4. 302, 302' (because the bridge 3 pivoting or shaft connection method is conventional, and its materials are different, it is not the structure emphasized and improved in this creation, so I will not repeat it below).

The above-mentioned printed circuit board 4 is a thin-film printed circuit board 4. Take the printed circuit board 4 commonly used in the industry today as an example. It includes a first printed circuit layer 41, a second printed circuit layer 42 and a laying The insulating spacer layer 43 between the aforementioned first and second printed circuit layers 41, 42 (the insulating spacer layer 43 can be made of polyester film printing, or can be directly formed by laying glue due to the different design of the contact circuit However, this is a well-known technique, so I wont repeat it in the following. In this example, the insulating spacer layer 43 is made of polyester film for printing.), where, as shown in Figure 4, the first and second The printed circuit layers 41, 42 are provided with a plurality of contacts 46, 46' symmetrical to the number and positions of the keyboard keys, and the insulating spacer layer 43 also has corresponding first and second printed circuit layers 41, 42 The contact points 46, 46' are provided with a plurality of through holes 431, and the above-mentioned pivotal portion 40 is cut by the first and second printed circuit layers 41, 42 and the insulating spacer layer 43 with two cutting lines 403 together with a cutter The sheet 404 is cut out and then extruded. The extrusion molding technology of the sheet 404 can be made into pivot holes 401, 402 by heat treatment, ultrasonic, hydraulic molding, or techniques with equivalent effects. In addition, the A set of pivoting portions 40 are defined on the printed circuit board 4 by cutting out the sheet body 404 with a predetermined cutting line 403 of different lengths, and forming two pivoting holes 401, 402 with different inner diameters to form a set. In the connecting area 47, one end of the movable shaft 302 of the bridge 3 is pivoted in a pivot hole 401 with a smaller inner diameter, and the other end of the movable shaft 302' is pivoted in another pivot hole 402 with a larger inner diameter. Relative to the aforementioned end movable shaft 302' to actuate (due to the different actuation modes of the applicable bridge 3, the inner diameters of the pivot holes 401, 402 must be adjusted accordingly, that is, the inner diameters of the two pivot holes 401, 402 are also possible same).

Please refer to Figures 4 and 5 again; the first printed circuit layer 41, the insulating spacer layer 43, and the second printed circuit layer 42 are printed and bonded, except for the connection of the first printed circuit layer 41. The predetermined area between the point 46 and the contact 46' and between the contact 46 and the contact 46' of the second printed circuit layer 42 is not glued and bonded, so that the printed circuit board 4 is printed and bonded at the same time, That is, an air channel 44 (as shown in Figure 6) allowing air to flow therebetween is formed, and the first printed circuit layer 41, the insulating spacer layer 43, and the second printed circuit layer 42 are hermetically combined to effectively prevent Moisture enters; and after the printed circuit board 4 is sealed and combined, a plurality of heat dissipation holes 45 can be added on both sides of the air channel 44 for key actuation and reduction of heat generated by the printed circuit board 4 signal transmission.

Please refer to FIG. 3 again, the above-mentioned printed circuit board 4 formed with a plurality of pivoting portions 40 and heat dissipation holes 45 is attached to the base 5 by adhesive bonding, and the movable shaft 302 at one end of the bridge 3 It is pivoted in the pivot hole 401 with a smaller inner diameter, and the movable shaft 302' at the other end is pivoted in the pivot hole 402 with a larger inner diameter. The elastic body 2 is positioned so as not to deviate when it is actuated, and it can be printed or coated with glue around the contacts 46, 46' on the printed circuit board, so that the bottom of the elastic body 36 can be glued and fixed on it when it is arranged, or Preset the joint area on the keycap 1 where the top of the elastic body 2 can be joined (adhesive or buckle, etc.). After the elastic body 2 is positioned, the keycap 1 is connected to the elastic body 2 and bridged with it 3 The positioning shaft 301 at the upper end is assembled and fixed to form a keyboard key, as shown in Figures 7-1 and 7-2. When the key is pressed down, the movable shaft 302 at one end of the bridge 3 is pivoted in the smaller part. The movable shaft 302' of the other end of the bridge 3 can be moved relative to the movable shaft 302 of the other end of the bridge 3 with a larger inner diameter in the pivot hole 401, thereby driving the elastic body 2 to press down. The convex portion 21 inside the elastic body 2 is actuated downward to press the contact 46 of the first printed circuit layer 41 of the printed circuit board 4 to contact the contact 46 of the second printed circuit layer 42 through the through hole of the insulating spacer layer 43 And turn on to transmit the signal of the button press.

In order to match the different materials of the bridge 3, the printed circuit board 4 can be made of an elastic material, which can be bent and assembled with the bridge 3 and then glued to the base 5 to meet the requirements of the industrial production process.

Please refer to Figure 8, which is a cross-sectional assembly view of another embodiment of this creation; wherein the groups of pivoting portions 40 can also be cut out from the first printed circuit layer 41 by the cutting line 403 to cut out the sheet body 404 and then After the pivot holes 401 and 402 are formed by pushing and forming, they are then printed and bonded with the insulating spacer layer 43 and the second printed circuit layer 42. The assembling and implementation methods are as described above and will not be described in detail below.

In summary, it can be seen from the above-mentioned embodiments that this case can effectively reduce the thickness of the keyboard, prevent the intrusion of moisture, and does not drop iron filings to avoid short circuit of the keyboard circuit board, thereby increasing the keyboard life and promoting the reduction of industrial production costs to be economical The effect of the benefits, but the above are only the preferred embodiments of this creation, and should not be used to limit the scope of implementation of this creation, that is to say, all equal changes and modifications made in accordance with the scope of the patent application for this creation should remain It is within the scope of this creation patent.

<p>Keycap1 Elastomer2</p><p>Bridge 3 Frame 30, 30'</p><p>Positioning axis301 Active axis302,302'</p><p>Printed circuit board4 First printed circuit layer41</p><p>The second printed circuit layer 42 Insulating spacer layer 43</p><p>Pivot part40 Pivot hole401, 402</p><p>Air channel44 Cooling hole45</p><p>Base5 Cutting line403</p><p>Film body404 contacts46, 46'</p><p>Bump 21 group connection area 47</p><p>Through hole431</p>

The first picture is the conventional keyboard structure;

The second picture shows another conventional keyboard structure;

The third picture is the keyboard structure created;

The fourth picture is an exploded view of the created printed circuit board before processing;

The fifth picture is the assembled picture of the created printed circuit board after processing;

The sixth figure is a schematic diagram of the air channels in the printed circuit board created;

The seventh picture-1 is the cross-sectional combined drawing of this creation;

The seventh picture-2 is a sectional view of the creation of the button press;

The eighth figure is a sectional combined drawing of another embodiment of the creation;