JP2007156226A - Adhesive tape and lens shape processing method for spectacle lens - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an adhesive tape and a lens shape processing method for a spectacle lens that ensure an accurate shaping of a spectacle lens and prevents failure in removing the tape. <P>SOLUTION: An adhesive tape 20 having an opaque tape base material and an adhesive layer to be in contact with a spectacle lens L is stuck to the spectacle lens L having a water repelling layer on the outermost surface and a dot as a horizontal reference printed on a convex surface L1 where the water repelling layer is formed. While the adhesive tape 20 is present between the spectacle lens L and a chuck 51 as a fixing device of a shape processing device 50, a grinding stone 60 is pressed to a rim of the spectacle lens L to shape the lens. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a pressure-sensitive adhesive tape and a lens shape processing method used for lens processing of spectacle lenses, and more particularly, to an adhesive tape and a lens processing method suitable for lens processing of spectacle lenses provided with a water-repellent layer.

  In an eyeglass lens, an antireflection film is usually formed on the surface of the eyeglass lens in order to suppress light reflection and increase light transmittance. In particular, eyeglass lenses have a problem in that dirt due to adhesion of hand dirt, fingerprints, sweat, cosmetics and the like is easily noticeable and difficult to remove. In order to cope with such problems and make it difficult to get dirt and to wipe off dirt, a water repellent layer is further provided on the surface of the antireflection film.

  The water repellent layer is formed by subjecting a fluorine-containing silane compound or the like having water repellency to a surface treatment, and has a characteristic that the coefficient of friction is extremely small and slippery for the purpose. For this reason, in a spectacle retailer or the like, the processing center is a chuck of a grinder when the peripheral edge of a spectacle lens formed with a predetermined spherical surface is ground with a grindstone into a shape that fits into the frame of a spectacle frame. There is a problem that the spectacle lens held and fixed to the lens is likely to be displaced (axial misalignment), and the spectacle lens cannot be accurately processed into a predetermined shape based on the prescription.

  In order to cope with these problems, a transparent adhesive sheet having a surface with better wettability to the adhesive than the surface of the spectacle lens and having an adhesive layer formed on the spectacle lens side is attached to the spectacle lens surface. A method of processing a spectacle lens in which a holding jig is attached to a pressure-sensitive adhesive sheet via a double-sided adhesive tape and the pressure-sensitive adhesive sheet has a larger area than the double-sided adhesive tape has been proposed (for example, see Patent Document 1). ).

Japanese Patent Laid-Open No. 9-258003

However, the processing method of the spectacle lens described in Patent Document 1 is that the adhesive sheet attached to the surface of the spectacle lens is transparent, so that the adhesive sheet at the time of shipment of the lens-shaped spectacle lens or spectacles is shipped. There is a concern that forgetting to peel off.
Accordingly, the present invention has been made in view of the above circumstances, and enables an eyeglass lens with a water-repellent layer to be accurately processed into a predetermined shape and prevents forgetting to peel off, and eyeglasses. It aims at providing the lens processing method of a lens.

  In order to solve the above-mentioned problems, the adhesive tape of the present invention is a fixing device for fixing the spectacle lens to an eyeglass processing device for grinding the periphery of the spectacle lens having an alignment mark serving as a horizontal reference on one surface. And the eyeglass lens, and is an adhesive tape that is attached to the eyeglass lens and has an area larger than an area that contacts the adhesive tape of the fixture, the adhesive tape being an opaque tape A notch having a size that allows the alignment mark to be visually recognized when the adhesive tape is adhered to the spectacle lens. It is characterized by providing.

  According to this, the adhesive tape that is affixed to the spectacle lens provided with an alignment mark serving as a horizontal reference on one surface and used for processing a lens for polishing the peripheral edge of the spectacle lens is an opaque tape base material and spectacle lens. By having a notch that does not hang on the alignment mark, which is the horizontal reference of the spectacle lens, it is possible to level the spectacle lens and forget to remove the adhesive tape after processing the target lens shape. Can be prevented.

  In addition, the spectacle lens having an alignment mark serving as a horizontal reference on one side has an adhesive layer formed of an opaque tape base material and an adhesive for adhering to the spectacle lens, and the adhesive tape Adhering step of adhering an adhesive tape having a notch of a size that allows the alignment mark to be visually recognized when adhering to the spectacle lens, so that the notch is at a position corresponding to the alignment mark; An attaching step of attaching a lens lock tape on the adhesive tape attached to the surface of the spectacle lens, and then attaching a holding jig on the lens lock tape; and after the attaching step, the spectacle lens is attached. A mounting step of mounting the holding jig on one fixing device of the target lens processing device; and after the mounting step, the lens processing device is attached to the other surface of the spectacle lens. A fixing step of pressing the other fixing device to fix the spectacle lens, and a grinding step of grinding a predetermined shape by contacting a grindstone with the outer peripheral portion of the spectacle lens fixed after the fixing step. It is characterized by that.

According to this target lens shape processing method, in the attaching process, a spectacle lens having an alignment mark serving as a horizontal reference on one surface is made opaque and has a notch corresponding to the alignment mark serving as the horizontal reference of the spectacle lens. By sticking the provided adhesive tape, it is possible to level the spectacle lens.
Moreover, in the peeling process which peels off the adhesive tape affixed on the spectacle lens, since the adhesive tape affixed on the spectacle lens is opaque, it can prevent forgetting to peel off the adhesive tape.

Embodiments of the present invention will be described below. In addition, this embodiment illustrates the case where it applies to a spectacle lens.
FIG. 1 is an explanatory view of a spectacle lens to which an adhesive tape of the present invention is attached, in which (a) is a plan view and (b) is a cross-sectional view.

  The spectacle lens L is, for example, an astigmatic spectacle lens, and is a meniscus lens in which one surface (outer surface) is a convex surface L1 and the other surface (inner surface: a surface located on the eyeball side) is a concave surface L2. Further, the spectacle lens L is a lens before so-called edging that is ground with a grindstone into a shape that can be accommodated in the frame of the spectacle frame, and the plane has a substantially circular shape. The diameter of the circle is about 75 mm.

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

  A water repellent layer having water repellency is formed on the outermost surface of the spectacle lens L for the purpose of making it difficult to get dirt and for easily removing the dirt. The water-repellent layer is preferably formed after the antireflection film is provided when the base material of the spectacle lens L is glass. When the base material is plastic, it is preferably formed after the hard coat layer is provided or after the hard coat layer and the antireflection film are provided.

The water-repellent layer is prepared by dissolving a known fluorine-containing silane compound in an organic solvent and applying it to the lens surface of the spectacle lens L, or by evaporating the fluorine-containing silane compound in a vacuum chamber to form the lens surface of the spectacle lens L. It can be formed using a vacuum deposition method. 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.

  The film thickness of the water repellent 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 water repellent layer is too thin, the antifouling effect will be poor, and if it is too thick, the surface will be sticky, such being undesirable. Further, when the water repellent layer is provided on the surface of the antireflection film, it is not preferable that the thickness of the water repellent layer is more than 0.03 μm because the antireflection effect is lowered.

  On the convex surface L1 of the spectacle lens L on which the water-repellent layer is formed, a mark is printed as an alignment mark serving as a horizontal reference when processing a target lens shape, which will be described later. The mark is a center mark 11 indicating the optical center, and two horizontal reference marks 12 and 13 indicating the horizontal direction of the spectacle lens set to a predetermined astigmatic axis based on prescription are removed with an organic solvent such as alcohol. The possible inks are described using means such as printing. The alignment mark serving as the horizontal reference may be represented by a line, a mark, or the like in addition to the mark point.

  In the center mark 11, two straight lines having a length of about 3 mm, for example, are printed in cross at the optical center position of the spectacle lens L. The horizontal reference marks 12 and 13 are printed in a circle having a diameter of about 2 mm on a horizontal line passing through the center mark 11 at, for example, positions on both sides of the center mark 11 that is 16 mm away from the center mark 11.

  The substantially spectacle-shaped spectacle lens L on which the water-repellent layer is formed is subjected to a lens shape process in which the periphery is ground with a grindstone so as to fit into the frame of the spectacle frame. From this processing form, the target lens shape processing is also referred to as a ball slicing process or an edging process.

  FIG. 2 is a schematic cross-sectional view of a spectacle lens fixing portion showing how the spectacle lens is processed into a target lens shape, and FIG. 3 is an exploded schematic diagram showing a fixing structure of the spectacle lens L. In each drawing, the size and ratio of each component are different from the actual ones for convenience of explanation.

  In FIG. 2, the lens processing of the spectacle lens is performed using a known lens processing device 50. The target lens shape processing apparatus 50 includes a pair of fixing devices including a chuck 51 as one fixing device and a lens presser 52 as the other fixing device, a grindstone 60 that presses and grinds the peripheral edge of the spectacle lens L, and All include a clamp shaft (not shown), a drive unit, a drive control unit that controls the operation of the drive unit, a storage unit that stores frame data and the like, a water supply nozzle, and the like.

  The chuck 51 has a function of mounting (holding and fixing) a holding jig 40 described later. The lens retainer 52 is provided with an elastic body such as rubber at the tip, and has a function of being pressed against and fixed to the concave surface L2 of the spectacle lens L. Further, the chuck 51 and the lens presser 52 are connected to the respective clamp shafts, and the driving amount controlled by the drive control unit is operated to control the feeding amount, rotation, and the like toward the spectacle lens L. A water supply nozzle supplies water to the peripheral part of the spectacle lens L ground at the time of grinding.

  The spectacle lens L having a water repellent layer formed on the convex surface L 1 is fixed between fixing devices including a chuck 51 and a lens holder 52. The spectacle lens L is fixed by being pressed by the chuck 51 and the lens holder 52 with the convex surface L1 set to the chuck 51 side. The central axis of the fixing device (chuck 51 and lens presser 52) is located at the processing center of the spectacle lens L.

Further, between the convex surface L1 of the spectacle lens L and the chuck 51, an adhesive tape 20, a lens lock tape 30, and a holding jig 40 are all interposed so as to cover the processing center portion of the spectacle lens L. Yes.
The spectacle lens L fixed to the fixing device of the target lens shape processing device 50 is ground into a predetermined outer shape by pressing a rotating grindstone 60 against the periphery of the lens.

  As shown in the exploded schematic view showing the fixing structure of the spectacle lens L in FIG. 3, the adhesive tape 20 is a colored opaque tape substrate 21 and an adhesive layer that forms an adhesive surface on one surface of the tape substrate 21. The adhesive layer 22 is used by being attached to the convex surface L1 with the adhesive layer 22 facing the convex surface L1 of the spectacle lens L.

The tape substrate 21 is made of an opaque substrate in which a pigment or a dye is dispersed in a polyethylene resin.
The term “opaque” in the present embodiment includes not only chromatic chromatic colors but also colorless white, gray, and black achromatic colors. When the adhesive tape 20 is superimposed on the spectacle lens L, it is formed on the convex surface L1. This means that the printed alignment mark has an opacity that is not visible.

  To have an opacity such that the alignment mark cannot be visually recognized means that light does not pass through at all, or that the contrast between the mark and the sheet cannot be clearly confirmed even through light. In addition, the light is not natural light, but is light emitted by a person skilled in the art at the time of axis alignment from a normal axiser used, for example, a projection axiser CE-1 manufactured by NIDEK CORPORATION, Using Topcon's axis PS-1 etc., illuminate a light source such as a tungsten bulb from below the spectacle lens, project alignment marks such as marks, lines, marks, etc. is there.

  As the opaque tape base material 21 in which the dye is dispersed, in addition to polyethylene resin, polyolefin resin such as polypropylene, polyester such as polystyrene and polyethylene terephthalate, polyvinyl acetate, ABS, polycarbonate, polyvinyl chloride resin, polyamide, polyimide , Acetates, thermoplastic resins such as 4-fluoroethylene, thermosetting resins such as epoxy resins, rubber-based resins such as soft rubber and hard rubber, and resins that reinforce them, for example, resins containing fibrous materials Can be mentioned.

  Further, as another opaque tape base material 21, a metal vapor-deposited film film in which a metal thin film is formed or an inorganic oxide film film in which an inorganic oxide film is formed on one surface of the base material such as polyethylene resin. Etc. can also be used. In the case of these films, the pressure-sensitive adhesive layer 22 is formed on the surface on which the metal vapor-deposited film or the inorganic oxide film is formed or on the surface opposite to the surface.

  The adhesive tape 20 is used to prevent so-called axial misalignment in which the spectacle lens L slides with respect to the chuck 51 due to the grinding pressure of the grindstone 60 when the spectacle lens L is processed into a lens shape. It is necessary to firmly adhere to the convex surface L1 of the lens L. 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 tape substrate 21, 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) The thickness (tensile yield strength or tensile fracture strength) is preferably 1 kgf / mm ² (9.8 N / mm ² ) or more. Further, as the tensile elastic modulus of the tape base material 21, the value of the tensile elastic modulus Em specified in the above JIS K7127 “Plastic Film and Sheet Tensile Test Method” is 1 kgf / mm ² or more and 450 kgf / mm ² or less (9. 8N / mm ² or more 4410N / mm ² or less range) are preferred. The tensile modulus is a region where stress and strain are in proportion to Hook's law.
If the value of the tensile elastic modulus of the tape base material 21 is too small, a large elongation occurs with a small load. As a result, an axis deviation may occur. On the other hand, if the value of the tensile elastic modulus of the tape base material 21 is too large, the lens shape may not be followed.

The thickness of the tape substrate 21 is 10 μm or more, preferably 20 μm or more, more preferably 30 μm or more. Moreover, the upper limit is about 1 mm.
The pressure-sensitive adhesive that forms the pressure-sensitive adhesive layer 22 includes rubber-based pressure-sensitive adhesives such as natural rubber (polyisoprene), styrene-butadiene rubber, butyl rubber, and polyisobutylene, acrylic pressure-sensitive adhesives, silicone-based pressure-sensitive adhesives, and vinyl acetate-based pressure-sensitive adhesives. Etc. can be illustrated. The thickness of the pressure-sensitive adhesive layer 22 is preferably in the range of 1 μm to 100 μm.

  The adhesive strength of the adhesive tape 20 is JIS Z 0237 “Adhesive tape / adhesive sheet test method” in order to prevent axial displacement of the spectacle lens L when processing the spectacle lens L formed with a water repellent layer. In the adhesive strength test method based on the 180-degree peeling method defined in (JIS Handbook 29 Adhesion Foundation, Japan Standards Association, issued on January 31, 2002), surface treatment was performed with a fluorine-modified silicone release agent as a test plate. When a polyethylene terephthalate plate is used, it is preferably 4 gf (0.0392 N) or more. However, the upper limit adhesive strength is preferably 400 gf or less. If the adhesive strength exceeds 400 gf, the film may be peeled off when a film such as an antireflection film is formed on the surface of the spectacle lens L (under the water repellent layer).

Further, as described above, the adhesive strength of the adhesive tape 20 is preferably 4 gf or more. When the adhesive strength is 4 gf or more and less than 8 gf, the area of the adhesive tape 20 may be about 700 mm ² or more. The outer shape of the adhesive tape 20 may be any shape as long as the mark can be visually recognized. Similarly, when the adhesive strength is 8 gf or more, it may have an area of about 400 mm ² or more.

However, the shape of the pressure-sensitive adhesive tape 20 does not need to be increased in order to obtain a large pressure-sensitive adhesive force, and the outer shape of the pressure-sensitive adhesive tape 20 has a portion that protrudes beyond the predetermined target lens shape of the spectacle lens L to be ground. May be peeled off by the grindstone 60, cutting water, or the like when processing the target lens shape. Therefore, it is preferable that the outer shape is smaller than the predetermined target lens shape to be ground.
In recent years, a crab eye type having a large aspect ratio is often used as a spectacle frame. In order to deal with such a spectacle frame, the size of the adhesive tape 20 is preferably 30 mm or less, more preferably about 25 mm.

  The pressure-sensitive adhesive tape 20 in this embodiment has an acrylic pressure-sensitive adhesive layer 22 having a thickness of about 10 μm on one surface of an opaque tape substrate 21 having a thickness of about 60 μm in which black carbon is dispersed in a polyethylene resin. Further, as shown by a two-dot chain line in the explanatory diagram of the spectacle lens in FIG. 1, the adhesive tape 20 is at least attached to the convex surface L1 of the spectacle lens L on which the antifouling layer is formed. It has a shape that does not hit the mark points (center mark 11 and horizontal reference marks 12, 13) printed on the convex surface L1.

The external shape of the adhesive tape 20 is, for example, an ellipse having a top and bottom width of 25 mm and a width of 40 mm, and a circular center hole 23 penetrating the adhesive tape 20 on the front and back is formed at the approximate center of the ellipse. The shape is formed of cutout holes 24 and 25 formed in a circular shape on the outer peripheral portion on the horizontal line. As a result, when the holding jig 40 described later is attached to the convex surface L1 of the spectacle lens L, the spectacle lens L is set on an aligner and printed on the convex surface L1 even though the tape substrate 21 is opaque. By confirming the marked point, the spectacle lens L can be fixed at a predetermined position. That is, it can level out.
In the present embodiment, the center hole 23 and the cutout holes 24 and 25 form a cutout.

  The center hole 23 is a notch for visually recognizing the center mark 11 when the adhesive tape 20 is attached to the convex surface L1 of the spectacle lens L. The notch holes 24 and 25 are the horizontal reference marks 12 and 13. It is a notch for visual recognition. Accordingly, for example, the diameter of the circular center hole 23 is approximately 6 mm and the circle forming the cutout holes 24 and 25 corresponds to each mark printed on the convex surface L1 of the spectacle lens L. This is a shape having a diameter of approximately 9 mm at a position approximately 16 mm away from the center. The shape and size of the center hole 23 and the cutout holes 24 and 25 are not limited to this as long as the mark point can be visually recognized.

The area of the adhesive tape 20 is approximately 630 mm ² and has an adhesive strength of about 7 gf.
The outer shape is an elliptical shape having a top and bottom width of 30 mm and a width of 40 mm, and the area of the adhesive tape in which the center hole 23 and the cutout holes 24 and 25 are formed is approximately 800 mm ² . Similarly, the area of the adhesive tape is about 1050 mm ² even in the case of a substantially rectangular shape having a top and bottom width of 30 mm and a width of 40 mm. Therefore, in order to cope with a crab type having a large aspect ratio, the maximum area of the adhesive tape 20 is preferably about 1000 mm ² .

In FIG. 3, the holding jig 40 is mounted on the chuck 51 of the target lens processing device 50, and is positioned and held and fixed, and a cylindrical lens holding portion 41 connected to the mounting portion 41. 42 is provided.
A protrusion 41 a is formed on the outer peripheral surface of the mounting portion 41 for fitting and positioning the holding jig 40 to the chuck 51 when the holding jig 40 is mounted on the chuck 51. For example, four protrusions 41a are formed at an angle of 90 degrees. One of the four protrusions is formed in a size different from that of the other three, and has a function of determining the orientation in a predetermined fixed direction when the chuck 51 is mounted. Further, the end surface of the lens holding portion 42 has a cup-shaped lens holding surface 42a.

The lens lock tape 30 includes adhesive layers 32 and 33 on both surfaces of the base tape 31, and has a function of a double-sided adhesive tape.
The lens lock tape 30 has an adhesive layer 32 side formed on one surface thereof attached to the lens holding surface 42a of the holding jig 40, and then the adhesive layer 33 side formed on the other surface together with the holding jig 40. It is attached to the adhesive tape 20 attached to the convex surface L1 of the spectacle lens L and used to hold the spectacle lens L to the holding jig 40. The outer shape and size of the lens lock tape 30 are not particularly limited, but are preferably smaller than the area of the adhesive tape 20 in order to make it easier to attach the holding jig 40 to the adhesive tape 20.

Next, a method for processing the target lens lens L will be described with reference to FIGS.
Prior to the processing of the target lens shape, the lens lock tape 30 is adhered to the lens holding surface 42a of the holding jig 40. In the lens lock tape 30, an adhesive layer 32 formed on one surface of the base tape 31 is attached to the lens holding surface 42 a of the holding jig 40. The lens lock tape 30 may be attached until the holding jig 40 attached with the lens lock tape 30 is attached onto the adhesive tape 20 of the spectacle lens L.

  In the lens processing of the eyeglass lens L, first, the adhesive tape 20 is attached to the convex surface L1 of the eyeglass lens L on which the water-repellent layer is formed (attachment step). Adhesion of the adhesive tape 20 is performed by using the center mark 11 printed on the center hole 23 and the convex surface L1 of the eyeglass lens L as a guide, and the approximate center of the circle forming the notch holes 24 and 25. Is positioned at the approximate center of each mark point (the center mark 11 and the horizontal reference marks 12, 13), and is stuck so as not to hit each mark point (see FIG. 1).

  And the spectacle lens L with the adhesive tape 20 attached to the convex surface L1 is attached with the holding jig 40 with the lens lock tape 30 attached on the adhesive tape 20 (attachment step). Here, the reason why the adhesive tape 20 is provided on the convex surface L1 side of the spectacle lens L is to avoid the point that the adhesive tape 20 is likely to wrinkle when the adhesive tape 20 is provided on the concave surface L2 side. .

  In the attaching process, first, the spectacle lens L having the adhesive tape 20 adhered to the convex surface L1 is set and fixed on a known axising device with the adhesive tape 20 side as an upper surface. So-called leveling is performed.

  The axising device is also called a blocker, and a mark (see FIG. 1) printed on the convex surface L1 of the spectacle lens L, that is, a center mark 11 indicating the optical center, and two horizontal reference marks 12 indicating the horizontal direction of the lens, 13 is confirmed, and the spectacle lens L is fixed at a predetermined position. At the time of fixing, the opaque adhesive tape 20 is adhered to the convex surface L1 of the spectacle lens L. The adhesive tape 20 has a center hole 23 and cutout holes 24 and 25, and the center mark 11 and the horizontal reference mark. The eyeglass lens L can be accurately fixed by being attached so as not to be hung on the pins 12 and 13.

The shape of the cutout holes 24 and 25 may be the shape of the present embodiment, but may be a circular cutout hole when the area of the adhesive sheet 20 is larger than this example.
In addition, when the adhesive strength of the adhesive sheet 20 is larger than that of the present example, the area of the adhesive sheet 20 can be reduced. In this case, the adhesive sheet 20 is not hung on the alignment mark. Such notch holes 24 and 25 may not be provided.

  The holding jig 40 in which the lens lock tape 30 is attached to the lens holding surface 42a on the adhesive tape 20 of the spectacle lens L fixed to the pivoting device causes the adhesive layer 33 of the lens lock tape 30 to be attached to the spectacle lens L side. To be attached. That is, the spectacle lens L is held by the holding jig 40. The holding jig 40 is attached in such a manner that the projections of different sizes among the four projections 41a formed on the outer peripheral surface of the mounting portion 41 are oriented in the direction of the spectacle lens L that is upward when the spectacles are mounted. The axis is arranged at the approximate center of the center mark 11 of the spectacle lens L (the center hole 23 of the adhesive tape 20).

Then, the spectacle lens L held by the holding jig 40 via the adhesive tape 20 and the lens lock tape 30 is attached to a chuck 51 as one fixing device of the target lens shape processing apparatus 50 (attachment process).
When the holding jig 40 is mounted on the chuck 51, the holding jig 40 is inserted in accordance with the recess formed in the chuck 51 so that the four protrusions 41a formed on the outer peripheral surface of the mounting portion 41 of the holding jig 40 are fitted. And then chucked. The direction of the spectacle lens L to be cast is determined by the projections of different sizes among the four projections 41 a formed on the outer peripheral surface of the mounting portion 41 of the holding jig 40.

  Then, in a state where the holding jig 40 is attached to the chuck 51, the lens presser 52 as the other fixing device of the target lens shape processing device 50 is drawn out by the clamp shaft and pressed against the concave surface L <b> 2 of the spectacle lens L. As a result, the spectacle lens L is sandwiched and fixed between the chuck 51 and the lens holder 52 (fixing step). That is, the adhesive tape 20 is interposed between the eyeglass lens L and the chuck 51 as a fixing device for the target lens shape processing device 50.

Then, the rotating grindstone 60 is pressed against the peripheral edge of the spectacle lens L fixed between the chuck 51 and the lens presser 52 and is ground into a predetermined shape (grinding step).
The grinding is performed to a predetermined shape that fits within the frame of the spectacle frame based on the frame data stored in the storage unit in advance. At the time of grinding, water is supplied from the water supply nozzle toward the peripheral edge of the spectacle lens L, the heat generated by the grinding is cooled, and the grinding powder is washed away.

After the eyeglass lens L that has been processed into a lens shape, the adhesive tape 20 attached to the convex surface L1 of the spectacle lens L is peeled off before or after being attached to the spectacle frame (peeling step). The pressure-sensitive adhesive tape 20 can be peeled off without failing to forget to peel it off because the pressure-sensitive adhesive tape 20 is colored and opaque.
Then, the mark printed on the convex surface L1 of the spectacle lens L is removed using an organic solvent such as alcohol to complete the spectacles.

  As described above, the pressure-sensitive adhesive tape 20 of the present embodiment has the opaque tape base material 21 and has the notches (the center hole 23 and the notch holes 24 and 25 corresponding to the mark points that serve as the horizontal reference of the spectacle lens L. ), The spectacle lens L can be leveled, and forgetting to remove the adhesive tape 20 after processing the target lens shape can be prevented. Further, the adhesive tape 20 is interposed between the eyeglass lens L and the chuck 51 as a fixing device of the target lens shape processing device 50, thereby forming a water repellent layer having a remarkably small friction coefficient and a slippery characteristic. Even with the spectacle lens L, the so-called axial misalignment in which the spectacle lens L slides with respect to the chuck 51 of the target lens shape processing apparatus 50 due to the grinding pressure of the grindstone 60 is prevented, and the accuracy based on the prescription is prevented. Thus, a spectacle lens L having a target lens shape is obtained.

  In addition, the eyeglass lens processing method according to the present invention provides a horizontal reference mark on the spectacle lens L on which the horizontal reference mark is written on the convex surface L1 on which the water-repellent layer is formed in the attaching step. A notch corresponding to the above is formed, and the adhesive tape 20 made of opaque is attached, so that the eyeglass lens L can be leveled.

A holding jig 40 attached on the adhesive tape 20 is attached to a chuck 51 as one fixing device of the target lens processing device 50, and the other end of the target lens processing device 50 on the concave surface L2 of the spectacle lens L. The eyeglass lens L is fixed by pressing the lens holder 52 as a fixing device of the lens, and the periphery of the eyeglass lens L is ground, so that a water repellent layer having a remarkably small friction coefficient and a slippery property is formed. Even for the spectacle lens L, the spectacle lens L is prevented from slipping with respect to the chuck 51 of the target lens shape processing apparatus 50 due to the grinding pressure of the grindstone 60, and the position is shifted. Can be ball-shaped.
Furthermore, when the adhesive tape 20 attached to the convex surface L1 of the spectacle lens L is peeled off, the adhesive tape 20 attached to the spectacle lens L is opaque, thereby preventing forgetting to remove the adhesive tape 20. it can.

The present invention is not limited to the embodiment described above, and may be, for example, the following aspects.
Although the adhesive tape 20 and the target lens shape processing method of the present embodiment have been described in the case of applying to the target lens processing of the spectacle lens L, the present invention is not limited to the spectacle lens, but may be applied to a lens whose peripheral edge is ground. it can.

  Moreover, although this embodiment demonstrated the case where the adhesive tape 20 was affixed only on the convex surface L1 of the spectacle lens L, you may affix and use it on both surfaces of the convex surface L1 and the concave surface L2. In this case, the grindstone 60 is provided by interposing the adhesive tape 20 between the spectacle lens L and the chuck 51 of the target lens processing device 50 and between the spectacle lens L and the lens holder 52 of the target lens processing device 50. It is possible to further prevent so-called axial deviation, in which the spectacle lens L slides with respect to the chuck 51 due to the grinding pressure, and the position is displaced.

  Further, when the adhesive tape 20 is adhered to the concave surface L2 of the spectacle lens L, the lens lock tape 30 may be further adhered onto the adhesive tape 20 adhered to the concave surface L2. As a result, the fixing force of the spectacle lens L is further improved, the grindstone 60 can be rotated at a higher speed to perform edge trimming, and the productivity of the target lens shape processing is improved.

It is explanatory drawing of the spectacle lens to which the adhesive tape of this invention is affixed, (a) is a top view, (b) is sectional drawing. The cross-sectional schematic diagram of the lens fixing | fixed part which shows the aspect by which a spectacles lens is lens-shaped. The exploded schematic diagram which shows the fixation structure of the spectacle lens L. FIG.

Explanation of symbols

L: spectacle lens as a lens, L1: convex surface, L2: concave surface, 11: center mark constituting a mark as an alignment mark, 12, 13 ... horizontal reference mark constituting a mark as an alignment mark, 20 ... adhesive Tape 21, tape base material 22, pressure-sensitive adhesive layer forming an adhesive surface 23, center hole as notch 24, 25 notch hole as notch 30 lens lock tape 31 base material Tape, 32, 33 ... adhesive layer, 40 ... holding jig, 41 ... mounting portion, 41a ... projection, 42 ... lens holding portion, 42a ... lens holding surface, 50 ... lens processing device, 51 ... as one fixing device , 52... Lens holding as the other fixing device, 60.

Claims (2)

The eyeglass lens is interposed between a fixing device for fixing the spectacle lens to an eyeglass processing device for grinding a peripheral edge of the spectacle lens having an alignment mark serving as a horizontal reference on one surface, and the spectacle lens An adhesive tape that is attached and has an area larger than an area that contacts the adhesive tape of the fixture,
The adhesive tape includes an opaque tape base material and an adhesive layer formed by an adhesive for adhering to the spectacle lens, and the alignment mark is visually recognized when the adhesive tape is adhered to the spectacle lens. A pressure-sensitive adhesive tape comprising a notch of a possible size. An eyeglass lens having an alignment mark serving as a horizontal reference on one side has an adhesive layer formed of an opaque tape base material and an adhesive for adhering to the eyeglass lens, and the adhesive tape is used as the eyeglass. A sticking step of sticking an adhesive tape having a notch of a size that allows the alignment mark to be visually recognized when sticking to a lens, so that the notch is in a position corresponding to the alignment mark;
Attaching a lens lock tape on the adhesive tape affixed to the spectacle lens surface, and then attaching a holding jig on the lens lock tape,
After the attaching step, an attaching step of attaching the holding jig to which the spectacle lens is attached to one fixing device of the target lens shape processing apparatus;
After the mounting step, a fixing step of fixing the spectacle lens by pressing the other fixing device of the target lens processing device against the other surface of the spectacle lens;
An eyeglass processing method for spectacle lenses, comprising: a grinding step in which a grindstone is brought into contact with an outer periphery of the fixed spectacle lens after the fixing step and is ground into a predetermined shape.

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