Lens lock sheet

【0001】

[Technical field to which the invention belongs]

The present invention relates to a lens lock sheet that is interposed between a lens fixing jig and a spectacle lens to prevent misalignment of the spectacle lens, particularly during rimming of the spectacle lens.

【0002】

[Conventional technology]

Generally, it is necessary to process the spectacle lens into the shape of the lens according to the shape of the spectacle frame, but when the spectacle lens processing machine performs the rimming process of the spectacle lens, the lens fixing provided in the spectacle lens processing machine is performed. The front and back surfaces of the spectacle lens are sandwiched and fixed from both directions by a jig. Examples of the lens locking means for fixing the spectacle lens include the techniques described in Patent Document 1 and Patent Document 2. Patent Document 1 describes that a suction cup attached to a lens fixing jig is used to attract a spectacle lens, and Patent Document 2 describes that an adhesive sheet is used to crimp and fix a spectacle lens with a lens fixing jig. ing.

【0003】

[Patent Document 1]

Japanese Unexamined Patent Publication No. 2001-318351 (Figs. 4 and 5) [Patent Document 2]

Japanese Unexamined Patent Publication No. 6-24852 (Figs. 1 and 2) [0004]

[Problems to be Solved by the Invention]

By the way, spectacle lenses coated with fluorine have become widespread in order to improve the water resistance, scratch resistance, stain resistance, water repellency, etc. of the spectacle lens. However, in recent years, spectacle lenses having a super-fluorine coating that further improves these effects have been developed. Since these ultra-fluorine-coated lenses have extremely high non-adhesiveness and slipperiness on the surface of the spectacle lens, even if a conventionally used adhesive sheet is attached to the spectacle lens, the adhesiveness is low. Sufficient adhesive strength cannot be obtained, and the spectacle lens shifts from the fixed position due to the resistance of the grindstone during the edging process.

【0005】

Further, in the method using a suction cup, the suction cup is once adsorbed on the spectacle lens coated with superfluorine, but when the above resistance is applied, the suction cup slips on the surface of the spectacle lens, and the same is true. There was a problem that the spectacle lens was displaced from the fixed position. In particular, in the case of spectacle lenses for astigmatism, there is a drawback that the axis of astigmatism shifts and the commercial value is lost. Therefore, it is difficult to process a spectacle lens having a high surface slipperiness coated with superfluorine or the like into a predetermined shape. For this reason, the processing of spectacle lenses coated with ultra-fluorine is, for example, a method of carefully processing the machine at an ultra-low speed, a method of processing by hand, or a method of processing at a store and then re-coating with fluorine at the manufacturer. There were only other very time-consuming methods, such as having them do it, or sending dimensional data to the manufacturer and having them coated with fluorine after processing. For this reason, spectacle lenses coated with ultra-fluorine are popular with users due to high processing costs and delayed delivery, but on the other hand, there is a problem that it is difficult to supply them.

【0006】

The present invention has been made in view of the above circumstances, and provides a lens lock sheet capable of reliably fixing a spectacle lens having a high surface slipperiness to a lens fixing jig.

【0007】

[Means for solving problems]

The following technical measures were taken to achieve the above objectives. That is, it is a lens lock sheet interposed between the lens fixing jig and the spectacle lens at the time of rimming of the spectacle lens, and adhesive layers are provided on both sides of the seal member layer and the seal member layer, and this adhesive is provided. It is characterized in that at least one side of the layer is made of a silicone-based adhesive. As a result, an adhesive layer made of a silicon-based adhesive is formed on the surface of the seal member attached to each tip of the lens fixing jig that holds the spectacle lens from both sides. , The adhesive strength of the seal member to the spectacle lens increases. Therefore, it is possible to prevent the positional deviation between the spectacle lens and the lens fixing jig during the edging process.

【0008】

Further, for example, the silicone-based adhesive has high adhesive strength even for spectacle lenses having a super-fluorine-coated surface and having high surface slipperiness. Therefore, even during the rimming process of the spectacle lens coated with superfluorine, the positional deviation between the spectacle lens and the lens fixing jig can be prevented, so that the rimming process can be performed accurately. Further, it is a lens lock sheet interposed between the lens fixing jig and the spectacle lens at the time of edging the spectacle lens, and is a first adhesive layer, a resin film layer, an adhesive layer, a seal member layer, and a second adhesive. The agent layers are sequentially laminated, and the first pressure-sensitive adhesive layer is made of a silicon-based pressure-sensitive adhesive.

【0009】

As a result, a silicon-based adhesive is applied to the surface of the sealing member attached to each tip of the lens fixing jig that holds the spectacle lens from both sides, and the sealing member and the spectacles. Since the resin film is sandwiched between the lens and the lens, the resistance to the misalignment between the spectacle lens and the lens fixing jig is further increased, and the misalignment can be reliably prevented. Further, for example, the silicone-based adhesive has high adhesive strength even for spectacle lenses having a high surface slipperiness coated with ultra-fluorine. Therefore, even during the rimming process of the spectacle lens coated with superfluorine, the positional deviation between the spectacle lens and the lens fixing jig can be prevented, so that the rimming process can be performed accurately.

【0010】

Another feature is that the resin film layer is made of a fluororesin. As a result, the resistance to misalignment can be further improved due to the peculiar physical properties of the fluororesin. As the fluorine-based resin, a tetrafluoroethylene resin, a trifluoroethylene resin, a difluorinated ethylene resin and the like can be used.

【0011】

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 show a first embodiment of the lens lock sheet 1 according to the present invention. The lens lock sheet 1 is composed of a sealing member layer 2 and an adhesive layer 3 applied to both sides of the sealing member layer 2, and has a substantially disk shape having a diameter of about 25 mm and a thickness of 0.5 to 1.0 mm. A pinch 4 with a protruding lingual side and a hole 5 are formed in the center of the lens.

【0012】

A rubber material is used for the sealing member layer 2 to impart cushioning properties. As the rubber material used here, for example, various rubber materials such as urethane rubber, SBR, and NBR can be used. Further, a silicone-based adhesive is used for the pressure-sensitive adhesive layer 3 coated on both sides of the seal member layer 2. As the silicone-based pressure-sensitive adhesive used here, various silicone-based pressure-sensitive adhesives such as those manufactured by Shin-Etsu Chemical Co., Ltd. and GE Toshiba Silicone Co., Ltd. can be used. The silicone-based adhesive is applied by applying the adhesive solution to the coated surface of the sealing member layer 2 and then heating at a temperature of 180 ° C for 5 minutes to crosslink the silicone resin and remove the solvent to remove the adhesive. It is preferable to form layer 3.

【0013】

Silicone-based adhesives are used because they have the property of being easier to adhere to various adherends than general adhesives such as rubber-based and acrylic-based adhesives, and are particularly treated with fluorine-based adhesives. This is because it exhibits excellent adhesive strength to various adherends, has a wide operating temperature range, and has excellent re-adhesiveness and durability. Since it is not always necessary to form the pressure-sensitive adhesive layer 3 made of a silicon-based adhesive on the surface of the lens lock sheet 1 to be attached to the lens fixing jig 7, it is necessary to apply the silicon-based adhesive on one side. Only the surface to be attached to the spectacle lens 6 is required. In this case, the lens lock sheet 1 is used so that the pressure-sensitive adhesive layer 3 made of a silicon-based pressure-sensitive adhesive is the adherend surface of the spectacle lens 6.

【0014】

The lens lock sheet 1 according to the present invention can be temporarily attached with a separator to the pressure-sensitive adhesive layer as in the conventional case. FIG. 3 shows a state in which the lens lock sheet 1 is attached to the lens fixing jig 7 of a known edging machine to fix the spectacle lens 6. Here, the main part of the edging machine is shown, and the spectacle lens 6 is fixed so that both sides thereof are sandwiched by the lens fixing jig 7. To perform the rimming process of the spectacle lens 6, first, the lens lock sheet 1 is attached to a predetermined portion on the front side (left side in FIG. 3) of the spectacle lens 6. Next, the lens fixing jig 7 is pressed against the other attachment surface of the lens lock sheet 1 while positioning to fix the lens lock sheet 1.

【0015】

By forming the hole 5 in the center of the lens lock sheet 1, it is possible to prevent the lens from being twisted when it is attached to the surface of the spectacle lens 6 on which the curved surface is formed. At this time, the sticking surface to be stuck to the spectacle lens 6 of the lens lock sheet 1 is always the side to which the silicon-based sticking agent is applied. After that, the other lens fixing jig 7 to which the lens lock sheet 1 is attached is pressed against the back side (right side in FIG. 3) of the temporarily fixed spectacle lens 6 in the fixing direction 8 to push the spectacle lens 6 left and right. Hold from. Then, the spectacle lens 6 is trimmed into the shape of the spectacle frame by a grindstone to which a grinding material is applied, such as an artificial diamond grindstone.

【0016】

Since the adhesive layer 3 made of silicon-based adhesive is formed on the adhesive surface of the lens lock sheet 1 attached to each tip of the lens fixing jig 7, it is extremely slippery and coated with superfluorine. It has high adhesive strength even for high spectacle lenses 6. As a result, it is possible to suppress the occurrence of misalignment between the lens fixing jig 7 and the spectacle lens 6 due to the resistance of the grindstone during the edging process, and to perform highly accurate processing. In particular, in the spectacle lens 6 for astigmatism, by using the lens lock sheet 1 having such high adhesive strength, highly accurate edging can be realized.

【0017】

4 and 5 show a second embodiment of the lens lock sheet 1. The difference from the first embodiment of this embodiment is that a resin film layer 9 is further provided between the seal member layer 2 and the spectacle lens 6 which is an adherend. In the present embodiment, as shown in FIG. 5, the first pressure-sensitive adhesive layer 3, the resin film layer 9, the adhesive layer 10, the sealing member layer 2, and the second pressure-sensitive adhesive layer 3 are sequentially laminated. As in the first embodiment, a silicon-based pressure-sensitive adhesive is used for the first pressure-sensitive adhesive layer 3 and the second pressure-sensitive adhesive layer 3, and a rubber material such as urethane rubber, SBR, or NBR is used for the sealing member layer 2.

【0018】

Further, as the adhesive layer 10, various adhesives such as acrylic type and urethane type which can bond the seal member layer 2 and the resin film layer 9 can be used, but in this embodiment, a cyanoacrylate type instant adhesive is used. Is used. A tetrafluoroethylene resin is used for the resin film layer 9. In this case, in order to improve the adhesiveness, it is preferable to perform surface modification treatment such as sputter etching treatment or metallic sodium treatment on both sides thereof because the adhesive strength becomes stronger. The method of using the lens lock sheet 1 according to the second embodiment is substantially the same as that of the first embodiment described above. When this lens lock sheet 1 is used, the adhesive layer 3 on the resin film layer 9 side (lower side in FIG. 5) is attached to the spectacle lens 6 for use. By interposing the resin film layer 9 between the seal member layer 2 and the spectacle lens 6 in this way, the resistance to the misalignment between the lens fixing jig 7 and the spectacle lens 6 is further increased, so that the misalignment is ensured. It is possible to realize more accurate edging processing. Further, by using the tetrafluoroethylene resin for the resin film layer 9, it is possible to increase the resistance to the misalignment between the lens fixing jig 7 and the spectacle lens 6 due to the peculiar physical characteristics of the resin.

【0019】

The second embodiment has the same shape as the first embodiment, and a hole 5 is formed in the central portion thereof. The hole 5 may penetrate the lens lock sheet 1, but in the present embodiment, as shown in FIG. 4, the hole 5 only penetrates the seal member layer 2, and the resin film layer 9 penetrates the hole 5. It is in a closed state. Further, the seal member layer 2 of the lens lock sheet 1 has a required thickness in order to provide cushioning properties, but if it is attached to the spectacle lens 6 as it is, the seal member layer 2 will be twisted. In order to improve the adhesion to the curved surface of 6, the central portion thereof is opened to form a hole 5. Therefore, the adhesive cannot be applied to the holes 5. Therefore, as a result of interposing the resin film layer 9 in the present embodiment, the holes 5 can be covered with the resin film layer 9 provided with the adhesive layer, so that the adhesive area can be increased, and the eyeglasses can also be formed at the holes 5. The adhesive strength to the lens 6 can be maintained.

【0020】

Since the resin film layer 9 is thinner than the sealing member layer 2, it should be attached along the curved surface of the spectacle lens 6 without causing twisting even if the holes 5 are not formed. Can be done. The resin film layer 9 of the lens lock sheet 1 according to the second embodiment is a Teflon (R) adhesive coated with a commercially available silicon-based adhesive such as a cyanoacrylate-based instant adhesive on one side of the sealing member layer 2. It may be manufactured by adhering tape. In the second embodiment, an ethylene tetrafluoride resin is used as the resin film layer 9, but in addition to this, a fluororesin such as an ethylene trifluoride resin or an ethylene difluoride resin, polyethylene or polyester, etc. Various synthetic resins such as nylon can be used.

【0021】

Further, the size, shape, and thickness of the lens lock sheet 1 are not limited to the above embodiment, and can be changed according to various embodiments. For example, the size may be a disk shape of 15 mm or 30 mm, the shape may be matched to another lens fixing jig 7 instead of the disk shape, or the thickness may be increased to improve cushioning. .. The lens lock sheet 1 according to the present invention may be used not only for the resin spectacle lens 6 but also for the glass spectacle lens 6. The present invention is not limited to the above-described embodiment, and the design can be changed according to other embodiments.

【0022】

[Effect of the invention]

It is possible to provide a lens lock sheet capable of securely fixing a spectacle lens having a high surface slipperiness to a lens fixing jig.

[Simple explanation of drawings]

FIG. 1 is a perspective view of a first embodiment of a lens lock sheet.

FIG. 2 is a sectional view taken along line AA.

FIG. 3 is a front view showing a usage state of the lens lock sheet.

FIG. 4 is a perspective view of a second embodiment of a lens lock sheet.

FIG. 5 is a cross-sectional view taken along the line BB.

[Explanation of symbols]

1 Lens lock sheet 2 Seal member layer 3 Adhesive layer 9 Resin film layer 10 Adhesive layer