JP2007152553A - Lens holding structure and lens shape processing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique for shaping a lens formed with an antifouling layers of a fluorine-containing silane compound excellent in the antifouling effect. <P>SOLUTION: The adhesive tape is disposed between the lens and at least one of a pair of chucks 2, 3 in a lens shape processing machine, and is characterized by adhesive surface for contact with the lens, and is characterized in that a measured adhesive strength of the adhesive surface is set 4 gf (0.0392N) or more when using a polyethylene terephthalate plate surface-treated by a fluorine modified silicone mold releasing agent as a test plate in an adhesive strength testing method by a 180-degree peeling method prescribed in JIS Z 0237 "adhesive tape/adhesive sheet test method". <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a pressure-sensitive adhesive tape and a target lens processing method used for target lens processing, and particularly to a pressure-sensitive adhesive tape and target lens processing method suitable for target lens target processing provided with an antifouling layer.

  A lens, such as a spectacle lens, is usually provided with an antireflection film on its surface in order to suppress light reflection and increase light transmission. There is a problem that dirt due to adhesion of materials and the like is easily noticeable and difficult to remove. Therefore, an antifouling layer is further provided on the surface of the antireflection film in order to make it difficult to get dirt or to easily wipe off dirt.

Regarding a surface treatment agent for providing an antifouling layer on a spectacle lens, there is the following Patent Document 1. A spectacle lens in which an antifouling layer is formed by surface treatment using the fluorine-containing silane compound described in this publication has good antifouling properties. The effect is persistent.
Japanese Patent Laid-Open No. 9-258003

  However, the lens surface-treated with the fluorine-containing silane compound described in the above publication has a remarkably small friction coefficient as compared with a conventional surface treatment agent. Therefore, it has a characteristic that the surface is too slippery. Due to this characteristic, the following problems occur when processing the lens. At eyeglass retailers, so-called target lens processing is performed in which a circular spectacle lens is ground and processed into a shape that fits into a frame of a spectacle frame. In this lens shape processing, first, the processing center of the spectacle lens is attracted and held by a chuck of a lashing machine. Alternatively, the processing center of the spectacle lens is sandwiched by applying pressure from both sides of the lens. As described above, the edge of the spectacle lens is ground with the grindstone while holding the spectacle lens with frictional force. Since the surface of the lens held by the chuck is slippery, when the lens is shaved with a grindstone, the surface of the lens is slippery. Axis deviation occurs. Therefore, there exists a problem that exact target lens shape processing cannot be performed.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a technique capable of processing a lens in which an antifouling layer is formed of a fluorine-containing silane compound having an excellent antifouling effect.

  The present inventors diligently studied to achieve the above object. As a result, it has been found that an adhesive tape having an excellent adhesion to the antifouling layer is attached to the lens surface to which the chuck of the ball grinder is applied.

  The present inventors conducted a test using stainless steel as a test plate defined in the adhesive force test of the adhesive tape described in JIS Z 0237 “Testing method for adhesive tape and adhesive sheet”. However, as a result, there is no difference between the measured value of the adhesive strength of the adhesive tape with excellent adhesive strength and the measured value of the adhesive strength with inferior adhesive tape for the lens with the antifouling layer formed. There was found.

  For this reason, a method for distinguishing an adhesive tape having excellent adhesion to a lens having an antifouling layer formed of a fluorine-containing silane compound was examined. Specifically, the present inventors performed an adhesive strength test of an adhesive tape using a polyethylene terephthalate plate surface-treated with a fluorine-modified silicone release agent as a test plate. As a result, in the case of the plate, compared with the case where a stainless steel plate is used as a test plate, the adhesive tape with excellent adhesion to the spectacle lens formed with the antifouling layer and the measured value of the inferior adhesive tape I found a difference between them. Further, it was found that if the adhesive strength in the adhesive strength test using this test plate is 4 gf or more, the adhesive tape adheres well to a spectacle lens having an antifouling layer formed of a fluorine-containing silane compound. Furthermore, it has been found that when an adhesive tape having an adhesive strength of 4 gf or more is interposed between the chuck and the lens of the lashing machine, the target lens can be processed without causing an axis deviation.

  When processing the target lens shape, a method is adopted in which the lens is held by pressing it from both surfaces of the lens with a chuck of a lashing machine. In this case, in the progressive multifocal lens, by sticking the adhesive tape on the concave surface of the lens, it is not necessary to stick the adhesive tape on various layout marks marked on the convex surface. For this reason, it is possible to surely eliminate the risk of removing the layout mark and perform the target lens shape processing.

  In addition, when sticking an adhesive tape on the convex surface of a progressive multifocal spectacle lens, it is desirable to provide a cutout hole at the center to avoid marking of the marked fitting point.

The pressure-sensitive adhesive tape of the present invention is a pressure-sensitive adhesive tape disposed between a lens and at least one of a pair of chucks in a lashing machine, and includes a pressure-sensitive adhesive surface for contacting the lens.
And the measured value of the adhesive strength of the adhesive surface was measured with a fluorine-modified silicone release agent as a test plate in the adhesive strength test method based on the 180 degree peeling method specified in JIS Z 0237 “Testing method for adhesive tape and adhesive sheet”. When a surface-treated polyethylene terephthalate plate is used, it is 4 gf (0.0392 N) or more.

  In some cases, a punched hole is provided in the center of the pressure-sensitive adhesive tape of the present invention.

  In the target lens shape processing method of the present invention, an adhesive tape is stuck on the antifouling layer of the lens provided with the antifouling layer. Then, the lens is held by the pair of chucks such that the adhesive tape is interposed between the lens and at least one of the pair of chucks in the balling machine. Then, the lens is processed into a lens shape by the lashing machine.

  Preferably, the adhesive tape has an adhesive surface for contacting the lens. And the measured value of the adhesive strength of the adhesive surface was measured with a fluorine-modified silicone release agent as a test plate in the adhesive strength test method based on the 180 degree peeling method specified in JIS Z 0237 “Testing method for adhesive tape and adhesive sheet”. When a surface-treated polyethylene terephthalate plate is used, it is 4 gf (0.0392 N) or more.

  More preferably, the antifouling layer is formed mainly of a fluorine-containing silane compound represented by the following general formula (1).

（但し、式中、Ｒ_fは炭素数１以上１６以下の直鎖状または分岐状パーフルオロアルキル基、Ｘはヨウ素または水素、Ｙは水素または低級アルキル基、Ｚはフッ素またはトリフルオロメチル基、Ｒ¹は加水分解可能な基、Ｒ²は水素または不活性な一価の有機基、ａ、ｂ、ｃ、ｄは０以上２００以下の整数、ｅは０または１、ｍおよびｎは０以上２以下の整数、ｐは１以上１０以下の整数を表す。）

Wherein R _f is a linear or branched perfluoroalkyl group having 1 to 16 carbon atoms, X is iodine or hydrogen, Y is hydrogen or a lower alkyl group, Z is a fluorine or trifluoromethyl group, R ¹ is a hydrolyzable group, R ² is hydrogen or an inert monovalent organic group, a, b, c, d are integers of 0 to 200, e is 0 or 1, and m and n are 0 or more (An integer of 2 or less, p represents an integer of 1 to 10, inclusive)

  In some cases, the target lens processing method includes a step of attaching the adhesive tape to the concave surface of the lens.

  The adhesive tape of this invention is an adhesive tape arrange | positioned between a lens and at least one of a pair of chuck | zipper in a lash processing machine, and is provided with the adhesive surface which touches the said lens. And when the adhesive force of the said adhesive surface is measured based on the predetermined test method, the measured value of the said adhesive force is 4 gf or more. However, the predetermined test method is that the test plate used in the adhesive strength test method of the 180 degree peeling method defined by JIS Z 0237 “Test method of adhesive tape / adhesive sheet” is surface-treated with a fluorine-modified silicone release agent. The adhesive strength test method is basically the same as the 180 degree peeling test method defined in JIS Z 0237 “Testing method for adhesive tape and adhesive sheet” except that the polyethylene terephthalate plate is replaced.

  In this specification, “JIS Handbook 29 Adhesion (Foundation / Japan Standards Association, issued on January 31, 2002)” and “JIS Handbook Steel (Foundation / Japan Standards Association, issued on April 12, 1989)” The entire contents of are incorporated.

  Hereinafter, although the embodiment of the pressure-sensitive adhesive tape for processing a lens and the method for processing the target lens shape of the present invention will be described, the present invention is not limited to the following embodiment.

  The lens shape processing of the spectacle lens is a stabbing process in which the edge of the circular spectacle lens is shaved with a grindstone so as to be settled by the spectacle frame. For this reason, the target lens shape processing is also called edge trimming. The spectacle lens is a meniscus lens having a convex surface on the object side and a concave surface on the eyeball side.

  FIG. 5 shows a lens shape processing method of a lens using a ball grinder. In the target lens shape processing method, first, the lens L is pressed by the chucks 2 and 3 of the ball grinder so as to sandwich the lens L from both sides of the optical axis of the lens. Here, the lens lock tape 4 is usually attached to the convex surface side of the lens L for preventing scratches and processing positioning, and the chuck 2 on the convex surface side of the lens L is attached to the surface of the lens L via the lens lock tape 4. Is pressed. In a state of being fixed to the chucks 2 and 3, a balling process is performed using the grindstone 5 based on the frame data.

  However, the spectacle lens surface-treated with the fluorine-containing silane compound disclosed in the above-mentioned publication has a remarkably small friction coefficient as compared with a conventional surface treatment agent and has a characteristic that the surface is too slippery. Therefore, since the surface of the lens L held by the chucks 2 and 3 is slippery when processing the target lens shape, the lens L slides with respect to the chucks 2 and 3 due to the grinding pressure of the grindstone 5 when grinding with the grindstone 5. There is a problem in that an accurate lens shape processing cannot be performed because of an axial misalignment that shifts the position.

  In order to solve this problem, the pressure-sensitive adhesive tape of the present invention is attached to a spectacle lens during processing of the target lens shape. Specifically, the pressure-sensitive adhesive tape of the present invention is used so as to be interposed between a chuck that holds the spectacle lens of the lashing machine and the spectacle lens.

  FIG. 1 shows an embodiment of a target lens processing method using the target lens processing adhesive tape 1. The target lens processing pressure-sensitive adhesive tape 1 of this embodiment corresponds to the pressure-sensitive adhesive tape of the present invention.

  In the configuration of FIG. 1A, the target lens processing pressure-sensitive adhesive tape 1 is positioned on the convex surface of the spectacle lens L. The lens lock tape 4 is positioned on the target lens processing adhesive tape 1. Furthermore, a lens holding member (not shown) is positioned on the lens lock tape 4. Here, the target lens processing adhesive tape 1, the lens lock tape 4, and the lens holding member all cover the processing center of the spectacle lens L. The chuck 2 presses the lens lock tape 4 toward the chuck 3 via the lens holding member, and the chuck 3 presses the spectacle lens L toward the chuck 2. Thus, the position of the spectacle lens L is fixed with respect to the chucks 2 and 3. The center positions of the chucks 2 and 3 of the lashing machine correspond to the processing center portion of the spectacle lens L.

  In the present embodiment, the chuck 2 and the chuck 3 are collectively referred to as a “lens fixing device”.

  A method for processing the eyeglass lens L using the configuration shown in FIG. 1A is as follows. First, the target lens processing pressure-sensitive adhesive tape 1 is attached to the convex surface of the spectacle lens L so as to cover the processing center portion. And the lens lock tape 4 is stuck on the adhesive tape 1 for target lens processing. Then, a lens holding member is stuck on the lens lock tape 4. Thereafter, the lens L provided with the target lens processing adhesive tape 1, the lens lock tape 4, and the lens holding member is inserted between the chuck 2 and the chuck 3 of the ball grinder. The position of the lens L is fixed by sandwiching the lens holding member, the lens lock tape 4, the target lens processing adhesive tape 1, and the lens L between the chuck 2 and the chuck 3. At this time, the chucks 2 and 3 and the spectacle lens L are aligned so that the respective center positions of the chucks 2 and 3 correspond to the processing center portion of the spectacle lens L. Then, the rotating grindstone 5 is brought into contact with the spectacle lens L, and the lens processing of the spectacle lens L is performed as shown in FIG.

  In the configuration of FIG. 1B, the target lens processing adhesive tape 1 is positioned on the concave surface of the spectacle lens L, while the lens lock tape 4 is positioned on the convex surface of the spectacle lens L. Then, the chuck 2 presses the lens lock tape 4 to the chuck 3 side via a lens holding member (not shown), and the chuck 3 presses the target lens processing adhesive tape 1 to the chuck 2 side. The position of L is fixed. Note that the target lens processing adhesive tape 1, the lens lock tape 4, and the lens holding member all cover the processing center portion of the spectacle lens L. Then, the rotating grindstone 5 is brought into contact with the spectacle lens L held in this manner, and the lens processing of the spectacle lens L is performed.

  In the configuration of FIG. 1C, one lens processing adhesive tape 1 is positioned on each of the convex surface and the concave surface of the spectacle lens L. The lens lock tape 4 is positioned on the target lens processing adhesive tape 1 on the convex surface. A lens holding member (not shown) is provided on the lens lock tape 4. The chuck 2 presses the lens lock tape 4 to the chuck 3 side via the lens holding member, and the chuck 3 presses the concave lens-side adhesive tape 1 to the chuck 2 side, whereby the eyeglass lens L The position of is fixed. The two lens processing adhesive tapes 1 each cover the processing center portion of the spectacle lens L. Then, the rotating grindstone 5 is brought into contact with the spectacle lens L held in this manner, and the lens processing of the spectacle lens L is performed.

  In FIGS. 1A and 1C, the target lens processing adhesive tape 1 is attached to the convex surface of the spectacle lens L. Further, the lens lock tape 4 is adhered on the target lens processing pressure-sensitive adhesive tape 1 to process the target lens. Further, when the lens lock tape 4 is not used for processing and positioning, the lens lock tape 4 can be omitted. Furthermore, when the adhesive layer is formed on the surface opposite to the lens surface of the lens-forming adhesive tape 1, the lens lock tape 4 can be omitted because it can serve as a positioning purpose.

  Further, the lens holding member of the present embodiment has biting teeth on the side in contact with the lens lock tape 4. Since the biting teeth are hard to be inserted into the lens lock tape 4, the lens L is more reliably held during lens processing. However, depending on the rotational speed of the lens L during lens processing and the magnitude of the torque generated by the friction between the grindstone 5 (FIG. 4) and the lens L, the biting teeth of the lens holding member may be omitted. The holding member itself may be omitted. The details of the structure of the lens holding member are described in Japanese Utility Model Laid-Open No. 6-24852, and the description thereof is omitted here.

  The target lens processing pressure-sensitive adhesive tape 1 of the present embodiment is used by sticking only to the convex surface, only the concave surface, or both the convex surface and the concave surface of the spectacle lens subjected to the antifouling process at the time of the target lens processing. Specifically, the adhesive tape 1 is used between the chuck for holding the spectacle lens of the lash processing machine and the spectacle lens. As a result, it is possible to prevent so-called axial misalignment in which the lens is displaced with respect to the chuck.

  For this purpose, the adhesive tape 1 for processing the target lens shape is stipulated in JIS Z 0237 “Testing Method for Adhesive Tape / Adhesive Sheet” (“JIS Handbook 29 Adhesion” Foundation / Japan Standards Association, issued on January 31, 2002). In the adhesive strength test method by the peel-off method, the test plate is tested using a polyethylene terephthalate plate surface-treated with a fluorine-modified silicone release agent. In this case, the adhesive strength of the target lens processing adhesive tape 1 is 4 gf (0.0392 N) or more.

  The outline of the adhesive strength test method by the 180-degree peeling method specified in JIS Z 0237 “Test method for adhesive tape / adhesive sheet” is shown below. The test site temperature is 23 ± 2 ° C., and the relative humidity is 65 ± 5% under standard conditions. The sample must be left in this standard atmosphere for at least 2 hours. For the test pieces, tapes and sheets having a width of 25 mm or more are cut to a width of 25 mm, tapes having a width of less than 25 mm are left as they are, and three pieces having a length of about 250 mm are collected. The tensile tester uses JIS B 7721. As the test plate, a SUS304 or SUS302 steel plate having a thickness of 1.5 to 2.0 mm specified in JIS G 4305 is cut into a width of 50 mm and a length of 125 mm. The manual roller used as the crimping device is coated with a rubber layer having a spring hardness of 80 ± 5 Hs and a thickness of about 6 mm as defined in JIS K 6301. The width is about 45 mm, the diameter is about 83 mm, and the mass is 2000 ± 50 g. Shall be. Align one end of the test piece with the clean side of the test piece with the adhesive side down, and let the test piece come to the center of the test plate. Striking talc or sticking paper on the adhesive surface of the part. The roller is reciprocated once from the top of the test piece at a speed of about 300 mm / min for pressure bonding. After crimping, the play portion of the test piece is folded back 180 degrees between 20 and 40 minutes, peeled off about 25 mm, and then the test piece is sandwiched between the upper chuck and the test plate is sandwiched between the lower chuck and a speed of 300 ± 30 mm / min. Now tear off. The force is read every time about 20 mm is peeled off, and is read a total of 4 times. The test is performed on three test pieces. An average value of 12 measured from the three test pieces is obtained, and this is proportionally converted per 10 mm width.

The test method for determining the adhesive strength of the target lens processing pressure-sensitive adhesive tape according to this embodiment is in accordance with the adhesive strength test method based on the 180-degree peeling method defined in the above JIS Z 0237 “Adhesive tape / adhesive sheet test method”. However, as a test plate, a polyethylene terephthalate plate having a thickness of 3 mm and surface-treated with a fluorine-modified silicone release agent is used. A specific method for manufacturing the test plate in the test method of the present embodiment is as follows. First, a fluorine-modified silicone release agent in a range of 0.3 g / m ^{2 to} 0.6 g / m ² is uniformly applied to the surface of a polyethylene terephthalate plate having a thickness of 3 mm, a width of 50 mm, and a length of 125 mm by a bar coating method or the like. Apply to. Then, the polyethylene terephthalate plate coated with the fluorine-modified silicone release agent is heated at about 150 ° C. for about 60 seconds. After the heating is completed, any one of ethanol, isopropyl alcohol, and acetone is applied as a cleaning liquid to the side of the polyethylene terephthalate plate that is covered with the fluorine-modified silicone release agent. Then, the cleaning solution is wiped off with gauze or the like. Such washing liquid application and wiping are repeated three or more times until it can be visually confirmed that the surface of the test plate has been cleaned. In this embodiment, X-70-201 manufactured by Shin-Etsu Chemical Co., Ltd. is used as the fluorine-modified silicone release agent.

  In this embodiment, a polyethylene terephthalate plate coated with a fluorine-modified silicone release agent and then heated is also referred to as a “polyethylene terephthalate test plate” for convenience.

  An adhesive tape having an adhesive strength measured by such an adhesive strength test method of at least 4 gf (0.0392 N) or more, preferably 6 gf (0.0588 N) or more is a fluorine-containing silane described in the aforementioned publication. It adheres strongly to spectacle lenses with antifouling layers formed of compounds. Then, by interposing the adhesive tape between the chuck and the lens of the stabbing machine, it is possible to prevent the shaft misalignment during the edging process. The upper limit adhesive strength is preferably 400 gf or less, but is not particularly limited. However, if the adhesive force of the adhesive tape is too great, the film such as an antireflection film formed on the lens surface may be peeled off.

  The adhesive tape 1 for processing a target lens has a structure in which an adhesive layer is provided on a base tape, like a general adhesive tape. Examples of the material of the base tape include polyolefin resins such as polyethylene and polypropylene, polyesters such as polystyrene and polyethylene terephthalate, polyvinyl acetate, ABS, polycarbonate, polyvinyl chloride resin, polyamide, polyimide, acetate, and 4-fluoroethylene. Examples thereof include thermoplastic resins such as epoxy resins, thermosetting resins such as epoxy resins, rubber-based resins such as soft rubber and hard rubber, and materials that reinforce them, such as fibrous materials. Examples of the adhesive include rubber adhesives such as natural rubber (polyisoprene), styrene-butadiene rubber, butyl rubber, polyisobutylene, acrylic adhesives, silicone adhesives, vinyl acetate adhesives, and the like. Can do.

  In order to prevent axial deviation during the processing of the target lens shape, it is necessary that the adhesive tape is firmly attached to the curved surface of the spectacle lens and receives the pressing force of the chuck. For this purpose, it is preferable to select a base tape based on mechanical properties such as tensile strength and tensile elastic modulus.

As the tensile strength of the base tape, the tensile strength specified in JIS K 7127 “Plastic Film and Sheet Tensile Test Method” (“JIS Handbook Steel” Foundation / Japan Standards Association, issued on April 12, 1989) (Tensile yield strength or tensile fracture strength) is preferably 1 kgf / mm ² (9.8 N / mm ² ) or more. The tensile modulus of the base tape is 1 kgf / mm ² or more and 450 kgf / mm ² or less (9.8 N) as defined in the above JIS K7127 “Plastic Film and Sheet Tensile Test Method”. / Mm ² or more and 4410 N / mm ² or less) is preferable. The tensile modulus is a region where stress and strain are in proportion to Hook's law. If the value of the tensile modulus of the base tape is too small, large elongation occurs with a small load. As a result, an axis deviation may occur. On the other hand, if the tensile modulus of the base tape is too large, the lens shape may not be followed.

The thickness of the base tape is preferably 10 μm or more, preferably 20 μm or more, and most preferably 30 μm or more. Moreover, the upper limit is about 1 mm. The thickness of the pressure-sensitive adhesive layer is preferably in the range of 1 μm to 100 μm. In addition, the area of the adhesive surface of the target lens processing adhesive tape is 4 gf (0.0392 N) or more and less than 8 gf (0.0784 N) in order to ensure the necessary adhesive force for the spectacle lens, In the case of 700 mm ² or more and an adhesive strength of 8 gf (0.0784 N) or more, it is preferable to secure an area of 400 mm ² or more.

  The shape of the base tape is not particularly limited as long as it has the above area, and can be, for example, circular, elliptical, rectangular, or the like. However, as shown in FIGS. 1 (a) and 1 (c), when the spectacle lens is a progressive multifocal lens and an adhesive tape is attached to the convex surface thereof, it is printed on the convex surface of the progressive multifocal lens. It is preferable that the shape does not affect the layout pattern.

  As shown in FIG. 2, various layout patterns are marked with ink removable by a solvent on the convex surface of the progressive multifocal lens. This layout pattern includes, for example, a horizontal reference line 101 that indicates the horizontal direction of the spectacle lens, a distance power measurement position 102 that indicates the position at which the power of the distance portion is measured, and a near purpose that indicates the position at which the power of the near portion is measured. These are layout symbols such as the frequency measurement position 103, the fitting point 104, and the left and right identification symbols 105.

  The target lens processing pressure-sensitive adhesive tape 1 of the present invention is stuck on a fitting point 104 indicating an optical center. The marking of the layout pattern printed on the spectacle lens on which the antifouling layer is formed easily peels off. Therefore, when the target lens processing adhesive tape 1 is stuck on the layout pattern, the ink of the layout pattern adheres to the target lens processing adhesive tape 1. As a result, the layout pattern may be removed from the surface of the spectacle lens L. The layout pattern is necessary even after processing the target lens shape. Therefore, as shown in FIG. 2, the target lens processing pressure-sensitive adhesive tape 1 is provided with a cut-out hole 11 at the center so as not to reach the fitting point 104. The outer shape is preferably formed in a circular shape, an elliptical shape or a rectangular shape so as not to reach the distance power measurement position 102 above the fitting point 104.

  As shown in FIG. 1 (b), when sticking the target lens processing adhesive tape 1 to the concave side of the spectacle lens L, nothing is printed on the concave side of the spectacle lens L. There is no limit. In order to improve the adhesive strength, the area of the adhesive tape 1 can be increased. For example, it can be attached to the entire concave surface of the spectacle lens.

  Below, the structure of the adhesive tape 1 for lens processing and the lens lock tape 4 is demonstrated in detail.

  The target processing adhesive tape 1 shown in FIG. 3A includes an adhesive layer 1a and a base tape 1b. The base tape 1b has a first surface and a second surface that face in opposite directions. And the adhesive layer 1a is located on the 1st surface of the base-material tape 1b. In this embodiment, the measured value of the pressure-sensitive adhesive layer 1a in the target lens processing pressure-sensitive adhesive tape 1 is 4 gf (0.0392 N) or more in the test method of the present embodiment. In addition, the pressure-sensitive adhesive layer 1 a provides an adhesive surface for contacting the lens L in the lens-shaped pressure-sensitive adhesive tape 1.

  On the other hand, the lens lock tape 4 shown in FIG. 3A includes an adhesive layer 4a, a base tape 4b, and an adhesive layer 4c. The base tape 4b has a first surface and a second surface that face in opposite directions. And the adhesive layer 4a is located on the 1st surface of the base-material tape 4b. Moreover, the adhesive layer 4c is located on the 2nd surface of the base-material tape 4b. Since the adhesive portions (adhesive layers 4a and 4c) are provided on both surfaces (that is, the first surface and the second surface) of the base tape 4b, the lens lock tape 4 has a function of a so-called double-sided adhesive tape.

  When performing lens processing operations such as target lens processing, a lens holding member (not shown) is bonded onto the pressure-sensitive adhesive layer 4c. Then, the target lens processing pressure-sensitive adhesive tape 1 is disposed so that the pressure-sensitive adhesive layer 1a and the lens L are in contact with each other. Furthermore, the lens lock tape 4 is disposed so that the pressure-sensitive adhesive layer 4a and the second surface of the base tape 1b are in contact with each other, and the lens holding member on the pressure-sensitive adhesive layer 4c and the chuck 2 are in contact with each other. In addition, the lens L is held between the chuck 2 and the chuck 3 by applying pressure between the chuck 2 and the chuck 3 (FIG. 1).

  The lens holding member of this embodiment has a tooth that is difficult to contact with the adhesive layer 4c. Since the biting teeth are hard to stick to the pressure-sensitive adhesive layer 4c, the lens L is more reliably held during lens processing. However, depending on the rotational speed of the lens L during lens processing and the magnitude of the torque generated by the friction between the grindstone 5 (FIG. 4) and the lens L, the biting teeth of the lens holding member may be omitted. The holding member itself may be omitted. The point that the bite teeth of the lens holding member or the lens holding member itself can be omitted is the same in the configurations of FIGS. 3B and 3C described below. As described above, the details of the structure of the lens holding member are described in Japanese Utility Model Laid-Open No. 6-24852, and the description thereof is omitted here.

  The target processing adhesive tape 1 shown in FIG. 3B includes an adhesive layer 1a, a base tape 1b, and an adhesive layer 1c. The base tape 1b has a first surface and a second surface that face in opposite directions. And while the adhesive layer 1a is located on the 1st surface of the base tape 1b, the adhesive layer 1c is located on the 2nd surface of the base tape 1b. In the present embodiment, the measured value of the adhesive strength of the pressure-sensitive adhesive layer 1a in the adhesive tape 1 for processing the target lens is 4 gf (0.0392N) or more in the test method of the present embodiment. However, the measured value of the adhesive strength of the pressure-sensitive adhesive layer 1c in the pressure-sensitive adhesive tape 1 may not be 4 gf or more in the test method of this embodiment. In addition, since the adhesive part (namely, adhesive layer 1a, 1c) is provided in both surfaces (namely, 1st surface and 2nd surface) of the base-material tape 1b, the adhesive tape 1 for target lens processing is double-sided tape. It has a function. The pressure-sensitive adhesive layer 1 a provides an adhesive surface for contacting the lens L in the target lens-forming pressure-sensitive adhesive tape 1.

  When performing lens processing operations such as target lens processing, a lens holding member (not shown) is bonded onto the pressure-sensitive adhesive layer 1c. Then, the target lens processing pressure-sensitive adhesive tape 1 is disposed so that the pressure-sensitive adhesive layer 1 a and the lens L are in contact with each other, and the lens holding member on the pressure-sensitive adhesive layer 1 c is in contact with the surface of the chuck 2. In addition, the lens L is held between the chuck 2 and the chuck 3 by applying pressure between the chuck 2 and the chuck 3 (FIG. 1).

  Since the adhesive layer is provided on the second surface in addition to the first surface of the base tape 1b, it is not necessary to provide the lens lock tape 4 between the chuck 2 and the lens L. That is, the target lens processing pressure-sensitive adhesive tape 1 also has the function of the lens lock tape 4.

  3 (c) shows an adhesive tape 1 for processing, an adhesive layer 1a, a first base tape 1b, an adhesive layer 1c, a second base tape 1b ′, and an adhesive layer. 1d. The first base tape 1b has a first surface and a second surface that face in opposite directions. And while the adhesive layer 1a is located on the 1st surface of the 1st base tape 1b, the adhesive layer 1c is located on the 2nd surface of the 1st base tape 1b.

  The second base tape 1b 'has a first surface and a second surface facing in opposite directions. The first surface of the second base tape is in contact with the pressure-sensitive adhesive layer 1c. That is, the first base tape 1b and the second base tape 1b 'are bonded to each other by the adhesive layer 1c. On the other hand, the adhesive layer 1d is located on the second surface of the second base tape 1b '.

  In the present embodiment, the measured value of the pressure-sensitive adhesive layer 1 a in the target lens-forming pressure-sensitive adhesive tape 1 is 4 gf (0.0392 N) or more in the test method of this example. However, the measured values of the adhesive strength of the pressure-sensitive adhesive layers 1c and 1d in the target adhesive tape 1 may not be 4 gf or more in the test method of this embodiment. The pressure-sensitive adhesive layer 1a provides an adhesive surface for contacting the lens L in the target lens-forming pressure-sensitive adhesive tape 1.

  When performing lens processing operations such as target lens processing, a lens holding member (not shown) is bonded onto the pressure-sensitive adhesive layer 1d. Then, the target lens processing pressure-sensitive adhesive tape 1 is arranged so that the pressure-sensitive adhesive layer 1 a and the lens L are in contact with each other, and the lens holding member on the pressure-sensitive adhesive layer 1 d is in contact with the surface of the chuck 2. In addition, the lens L is fixed between the chuck 2 and the chuck 3 by applying pressure between the chuck 2 and the chuck 3 (FIG. 1).

  The target lens processing method using the target lens processing adhesive tape of the present embodiment does not cause axial misalignment when processing a spectacle lens having an antifouling layer on the surface of the spectacle lens (that is, a slippery spectacle lens). . Of course, the target lens processing method using the target lens processing adhesive tape of the present embodiment does not cause axial misalignment even when processing a non-slip lens having no antifouling layer.

  As the base material of the spectacle lens, either inorganic glass or plastic can be used. Examples of the plastic include diethylene glycol bisallyl carbonate (CR-39) resin, polyurethane resin, thiourethane resin, polycarbonate resin, and acrylic resin.

  As the antifouling layer, for example, a fluorine-containing silane compound represented by the following general formula (1) proposed in the above-mentioned Patent Document 1 has been used as a main component, which has heretofore been difficult to beaded. Is preferred.

一般式（１）中のＲ_fは炭素数１以上１６以下の直鎖状または分岐状パーフルオロアルキル基であるが、好ましくはＣＦ₃−，Ｃ₂Ｆ₅−，Ｃ₃Ｆ₇−である。Ｒ¹は加水分解可能な基であり、例えばハロゲン、−ＯＲ³、−ＯＣＯＲ³、−ＯＣ（Ｒ³）＝Ｃ（Ｒ⁴）₂、−ＯＮ＝Ｃ（Ｒ³）₂、−ＯＮ＝ＣＲ⁵が好ましい。さらに好ましくは、塩素、−ＯＣＨ₃、−ＯＣ₂Ｈ₅である。ここで、Ｒ³は脂肪族炭化水素基または芳香族炭化水素基、Ｒ⁴は水素または低級脂肪族炭化水素基、Ｒ⁵は炭素数３以上６以下の二価の脂肪族炭化水素基である。Ｒ²は水素または不活性な一価の有機基であるが、好ましくは、炭素数１以上４以下の一価の炭化水素基である。ａ、ｂ、ｃ、ｄは０以上２００以下の整数であるが、好ましくは１以上５０以下であり、ｅは０または１である。ｍおよびｎは０以上２以下の整数であるが、好ましくは０である。ｐは１以上の整数であり、好ましくは１以上１０以下の整数である。また、分子量は５×１０²〜１×１０⁵であるが、好ましくは５×１０²〜１×１０⁴である。

R _f in the general formula (1) is a linear or branched perfluoroalkyl group having 1 to 16 carbon atoms, preferably CF ₃ —, C ₂ F ₅ —, C ₃ F ₇ —. . R ¹ is a hydrolyzable group, for example, halogen, —OR ³ , —OCOR ³ , —OC (R ³ ) = C (R ⁴ ) ₂ , —ON = C (R ³ ) ₂ , —ON = CR ⁵ is preferred. More preferably, chlorine, -OCH _3, is -OC ₂ H _5. Here, R ³ is an aliphatic hydrocarbon group or aromatic hydrocarbon group, R ⁴ is hydrogen or a lower aliphatic hydrocarbon group, and R ⁵ is a divalent aliphatic hydrocarbon group having 3 to 6 carbon atoms. . R ² is hydrogen or an inert monovalent organic group, preferably a monovalent hydrocarbon group having 1 to 4 carbon atoms. a, b, c, and d are integers of 0 or more and 200 or less, preferably 1 or more and 50 or less, and e is 0 or 1. m and n are integers of 0 or more and 2 or less, preferably 0. p is an integer of 1 or more, preferably an integer of 1 or more and 10 or less. Moreover, although molecular weight is 5 * 10 < ² > -1 * 10 < ⁵ >, Preferably it is 5 * 10 < ² > -1 * 10 < ⁴ >.

  Moreover, what is shown by following General formula (2) is mentioned as one of the preferable structures of the fluorine-containing silane compound shown by the said General formula (1).

上記式中、Ｙは水素または低級アルキル基、Ｒ¹は加水分解可能な基、ｑは１以上５０以下の整数を、ｍは０以上２以下の整数、ｒは１以上１０以下の整数を表す。

In the above formula, Y represents hydrogen or a lower alkyl group, R ¹ represents a hydrolyzable group, q represents an integer of 1 to 50, m represents an integer of 0 to 2, and r represents an integer of 1 to 10. .

  In order to form the antifouling layer on the spectacle lens using the fluorine-containing silane compound, a method of dissolving in an organic solvent and applying to the spectacle lens surface can be employed. As a coating method, a dipping method, a spin coat method, a spray method, a flow method, a doctor blade method, a roll coat coating, a gravure coat coating, a curtain flow coating, or the like is used. Examples of the organic solvent include perfluorohexane, perfluoromethylcyclohexane, perfluoro-1,3-dimethylcyclohexane, and the like.

  When diluted with an organic solvent, the concentration of the fluorine-containing silane compound is preferably in the range of 0.03 wt% to 1 wt%. When the concentration of the compound is too low, it is difficult to form an antifouling layer having a sufficient film thickness, so that a sufficient antifouling effect cannot be obtained. On the other hand, if the concentration of the compound is too high, the antifouling layer may be too thick. Therefore, there is a possibility that the burden of performing a rinsing operation for eliminating uneven coating after application of the compound may increase.

  As a method for applying the fluorine-containing silane compound, a vacuum vapor deposition method in which the fluorine-containing silane compound is evaporated in a vacuum chamber and adhered to the spectacle lens surface may be employed. In the vacuum deposition method, the raw material compound can be used at a high concentration or without a diluting solvent.

  The film thickness of the antifouling layer is not particularly limited, but is 0.001 μm or more and 0.5 μm or less, preferably 0.001 μm or more and 0.03 μm or less. If the film thickness of the antifouling layer is too thin, the antifouling effect is poor, and if it is too thick, the surface becomes sticky, which is not preferable. Further, when the antifouling layer is provided on the antireflection film surface, it is not preferable that the antifouling layer has a thickness of more than 0.03 μm because the antireflection effect is lowered.

  The target lens shape processing method of the present embodiment is applied to a spectacle lens having an antifouling layer mainly composed of the fluorine-containing silane compound represented by the general formula (1). That is, at the time of target lens processing, the target lens processing pressure-sensitive adhesive tape of the present invention is stuck only on the convex surface of the lens, only on the concave surface, or on both surfaces of the convex and concave surfaces. Then, the adhesive tape is interposed between the chuck for holding the spectacle lens of the lashing machine and the spectacle lens. As a result, it is possible to prevent an axial deviation in which the lens is displaced with respect to the chuck.

  Next, examples of the present invention will be described. The following 4 types were used as the adhesive tape for processing the target lens shape.

Adhesive tape A for lens processing: Adhesive tape EXP403-10 (base sheet: 60 μm thick polyethylene, adhesive: 20 μm thick acrylic) manufactured by Sanei Kaken Co., Ltd. was prepared as an adhesive tape A for target lens processing. Adhesive strength of the adhesive tape A for processing a 3 mm-thick PET (polyethylene terephthalate) plate treated with X-70-201 (manufactured by Shin-Etsu Chemical Co., Ltd.) in JIS Z 0237 “Testing method for adhesive tape and adhesive sheet” It was 4 gf (0.0392 N) when measured according to the adhesive strength test method based on the 180-degree peeling method specified. This was cut into an elliptical shape with a top width of 25 mm and a width of 40 mm, and a 6 mmφ punched hole (adhesion area: 757.12 mm ² ) was used at the center.

Adhesive tape B for edging: Adhesive tape 731A (60 μm thick PE sheet base material, acrylic adhesive 10 μm) manufactured by Sanei Kaken Co., Ltd. was prepared as an adhesive tape B for edging. 180 degree | times which prescribes | regulates the adhesive force of the adhesive tape B for a lens processing with respect to 3 mm thickness PET board processed by X-70-201 (made by Shin-Etsu Chemical Co., Ltd.) to JISZ0237 "adhesive tape * adhesive sheet test method". It was 8 gf (0.0784 N) when measured according to the adhesion test method by the peeling method. This was cut into a circular shape of 25 mmφ, and a 6 mmφ punched hole (adhesion area: 462.60 mm ² ) was used at the center.

Bead processing adhesive tape C: A double-sided adhesive seal provided with a base sheet containing a neoprene foam having a thickness of 1 mm and an acrylic adhesive layer having a thickness of 20 μm was prepared as a lens processing adhesive tape C. JIS Z0237 “Adhesive tape / adhesive sheet test method” defines the adhesive strength of the adhesive tape C for processing a 3 mm thick PET (polyethylene terephthalate) plate treated with X-70-201 (manufactured by Shin-Etsu Chemical Co., Ltd.). It was 10 gf when measured according to the adhesive strength test method by 180 degree peeling method. This was cut into a circular shape of 25 mmφ, and a 6 mmφ punched hole (adhesion area: 462.60 mm ² ) was used at the center.

Adhesive tape D for lens processing (comparison): Adhesive tape EXP403-30 (base sheet: 60 μm thick polyethylene, adhesive: acrylic 10 μm) manufactured by Sanei Kaken Co., Ltd. was prepared as an adhesive tape D for target processing. The adhesive force of the adhesive tape D for processing a 3 mm-thick PET (polyethylene terephthalate) plate treated with X-70-201 (manufactured by Shin-Etsu Chemical Co., Ltd.) is applied to JIS Z 0237 “Testing method for adhesive tape and adhesive sheet”. It was 2 gf when measured according to the adhesive strength test method based on the 180-degree peeling method specified. This was cut into an elliptical shape with a top width of 25 mm and a width of 40 mm, and a 6 mmφ punched hole (adhesion area: 757.12 mm ² ) was used at the center.

Using the four types of adhesive tapes for processing the target lens, a target lens processing test was performed as follows. However, since the adhesive tape C for processing the lens also serves as the lens lock tape 4, the test was conducted in Tests 1 and 3 with the lens lock tape 4 omitted.
Test 1: As shown in FIG. 1A, an axial misalignment evaluation test was performed using the lens-shaped adhesive tapes A, B, C, and D on the convex surface of the lens L, respectively.
Test 2: As shown in FIG. 1B, an axial misalignment evaluation test was performed using the lens-shaped adhesive tapes A, B, C, and D on the concave surface of the lens L, respectively.
Test 3: As shown in FIG. 1 (c), an axial misalignment evaluation test was performed using the lens-forming adhesive tapes A, B, C, and D on both the convex and concave surfaces of the lens L, respectively.

  The lens is a plastic lens for spectacles (“Seiko Super Sovereign Care Care Coat” manufactured by Seiko Epson Corporation, which is a lens on which an antifouling layer surface-treated with the fluorine-containing silane compound described in the above-mentioned publication is formed). −7.00 D, C = −3.00 D were used.

  The following axial misalignment evaluation tests were performed on these target lens-shaped adhesive tapes.

  Test method: This evaluation is performed when the lens L is ground into a predetermined frame shape using a stabbing machine, and between the chuck portion (the part where the lens is fixed to the shaft of the processing machine) and the lens surface. This was done by observing the occurrence of axial misalignment caused by sliding.

  First, a test lens was prepared and set on a lens fixing jig. At this time, the lens containing astigmatism was fixed so that the astigmatism axis was in a specified direction (for example, 180 °). For those without astigmatism, a straight line was drawn through the optical center of the lens. And it fixed so that this might become a regulation direction (for example, 180 degrees). A crab eye type frame with a large aspect ratio was prepared and used as a reference frame.

  If necessary, an adhesive tape for processing a lens shape is attached to the convex or concave surface of the lens. A lens lock tape is attached to the convex surface of the lens, and the lens is fixed to a lashing machine ("LE-8080" manufactured by NIDEK Co., Ltd.) as shown in FIG. went. The lens after the balling process was put in a reference frame, and the astigmatism axis deviation was measured with a lens meter. When a straight line passing through the optical center of the lens was marked, the angle of deviation between the scored line and the horizontal line passing through the optical axis of the reference frame was measured.

  Ten lenses were balled and the ratio of the axial deviation exceeding the allowable range was calculated. It should be noted that the allowable range of shaft misalignment was ± 2 ° or less.

  Table 1 shows the results of an axial deviation evaluation test of the target lens processing pressure-sensitive adhesive tape. Note that the occurrence rate of the axis deviation was 100% when the target lens processing was performed without using the target lens processing adhesive tape.

  The adhesive lens 1 for processing the target lens shape according to the present embodiment was attached to the convex surface, concave surface, or both surfaces of the spectacle lens, and was interposed between the chuck of the lashing machine. As a result, from the results in Table 1, it is recognized that the adhesive tape 1 can be glazed without causing an axis deviation even for an extremely slippery spectacle lens that has been surface-treated with a fluorine-containing silane compound to form an antifouling layer. .

The target lens processing pressure-sensitive adhesive tape 1 of the present embodiment is attached to a spectacle lens at the time of target lens processing.
The adhesive tape 1 is used between the chuck for holding the spectacle lens of the lashing machine and the spectacle lens. With such a configuration, even if a slippery antifouling layer is formed on the surface of the spectacle lens, the adhesive tape 1 and the lens do not cause axial misalignment and can be processed into a target lens shape.

  In addition, according to the target lens shape processing method of the present embodiment, it is possible to perform target lens processing without causing an axis shift even if a slippery antifouling layer is formed on the spectacle lens.

  In the present embodiment, the example in which the present invention is applied to eyeglass processing of spectacle lenses has been described. However, the present invention is not limited to spectacle lenses, and the present invention can also be applied to lens processing of general lenses.

It is sectional drawing which shows the target lens processing method using the adhesive tape for lens processing of this invention, (a) is the case where the adhesive tape for lens processing is stuck on the convex surface of a lens, (b) is on the concave surface of a lens. When the target lens processing adhesive tape is attached, (c) shows the case where the target lens processing adhesive tape is attached to both surfaces of the lens. The top view which shows one Embodiment of the shape of the adhesive tape for target processing. (1)-(3) The schematic diagram which shows the cross-sectional structure of the adhesive tape for a lens shape process. The schematic diagram which shows the target lens processing method. The schematic diagram which shows the target lens processing method.

Explanation of symbols

  1: Adhesive tape for target processing, 1a, 1c, 1d: adhesive layer, 1b, 1b ': base tape, 2, 3: chuck, 4: lens lock tape, 5 grindstone, L: lens.

Claims (6)

An adhesive tape disposed between the lens and at least one of a pair of chucks in the balling machine,
An adhesive surface for contacting the lens;
The measured value of the adhesive strength of the adhesive surface is a surface treatment with a fluorine-modified silicone release agent as a test plate in an adhesive strength test method based on the 180-degree peeling method specified in JIS Z 0237 “Testing method for adhesive tape and adhesive sheet”. When the polyethylene terephthalate plate is used, the pressure-sensitive adhesive tape is 4 gf (0.0392 N) or more. The pressure-sensitive adhesive tape according to claim 1,
A pressure-sensitive adhesive tape, wherein a hollow is provided in the center.   Adhering an adhesive tape on the antifouling layer of the lens provided with the antifouling layer, so that the adhesive tape is interposed between the lens and at least one of a pair of chucks in the ball grinder, A lens shape processing method, wherein the lens shape is processed by the stabbing machine while the lens is held by the pair of chucks. In the shape processing method according to claim 3,
The adhesive tape has an adhesive surface for contacting the lens,
The measured value of the adhesive strength of the adhesive surface is a surface treatment with a fluorine-modified silicone release agent as a test plate in an adhesive strength test method based on the 180-degree peeling method specified in JIS Z 0237 “Testing method for adhesive tape and adhesive sheet”. When the polyethylene terephthalate plate is used, it is 4 gf (0.0392 N) or more. In the shape processing method according to claim 3,
The antifouling layer is formed using a fluorine-containing silane compound represented by the following general formula (1) as a main component.

In the formula, _Rf is a linear or branched perfluoroalkyl group having 1 to 16 carbon atoms, X is iodine or hydrogen, Y is hydrogen or a lower alkyl group, Z is fluorine or a trifluoromethyl group, R ¹ is a hydrolyzable group, R ² is hydrogen or an inert monovalent organic group, a, b, c and d are integers of 0 or more and 200 or less, e is 0 or 1, m and n are 0 or more and 2 The following integer, p represents an integer of 1 to 10. In the target lens shape processing method according to any one of claims 3 to 5,
A shape processing method, wherein the pressure-sensitive adhesive tape is attached to a concave surface of the lens.

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