JP2009196144A - Holder for processing of contact lens material, processing apparatus for contact lens material and method of manufacturing contact lens - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a holder for processing of a contact lens material which causes no damage of a lens material or adhesion of dirt and allows a stable release of the contact lens material. <P>SOLUTION: The holder for processing of a contact lens material includes an adhesive surface and is used to cut and grind the contact lens material after adhering the contact lens material to the adhesive surface of the holder through an adhesive. The holder is made of a resin and includes a convex surface in the central part of the adhesive surface and an adhesive reservoir in the periphery. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a contact lens material processing apparatus for processing contact lens material, and a contact lens manufacturing method using them.

  Conventionally, in manufacturing contact lenses and intraocular lenses, the lens material is bonded and fixed to an appropriate support with an adhesive when processing such as cutting and polishing of the lens material is performed, and the support. A method of removing the contact lens material formed on the surface of the support by applying a solvent dipping method or applying an external force has been proposed.

  Up to now, a technology that uses a lens holding portion having a curved convex surface as a support, adheres a spherical concave surface of the lens material to the lens holding portion, and applies an external force to the side surface of the support to cause the lens material to be detached. Is known (Patent Document 1). However, since the curved convex surface of the support described in Patent Document 1 has a shape corresponding to the concave surface of the lens material, when the lens material is pressed onto the curved convex surface of the support via an uncured adhesive. When the amount of the adhesive is large or the pressing depth is large, the adhesive protrudes and may wrap around to the upper side of the lens material, which causes a problem that the lens material cannot be detached.

In addition, using a support in which the curvature of the peripheral part of the bonding surface with the lens of the support is changed, and the lens material is adhered by the adhesive, an external force is applied to the adhesive in the radial direction to apply the lens material. A method of detachment has been proposed (Patent Document 2). However, since this method requires the adhesive layer to be directly sandwiched between narrow pressure jigs, high positioning accuracy is required and the device becomes expensive, and if the positioning is not successful or the amount of adhesive is excessive. When the amount is too small, there is a problem that the separation does not work or the lens is damaged. Further, since the adhesive contacts the narrow pressure jig, there is a problem that the adhesive attached to the jig adheres to the lens and becomes soiled by performing repeated operations.
JP-A-9-90290 JP 11-240030 A

  The present invention eliminates the disadvantages of the prior art, and the contact lens material processing support, the contact lens material processing apparatus, and the lens material can be stably detached without the lens material being damaged or contaminated. It is to provide a method for manufacturing a contact lens.

  The present invention is a contact lens material processing support having a bonding surface, and used for cutting and polishing the contact lens material after bonding the contact lens material to the bonding surface via an adhesive. And a contact lens material processing support characterized in that the adhesive surface has a convex surface at the center and an adhesive pool at the periphery.

  The contact lens material processing support described above, a cutting means for cutting the contact lens material, and a narrow pressure means for applying an external force to the side surface of the contact lens material processing support. Device.

  Also, an adhesive surface of the resin contact lens material processing support having an adhesive surface, a convex surface at the central portion of the adhesive surface, and an adhesive pool portion at the peripheral portion of the adhesive surface is interposed with an ultraviolet curable adhesive. The contact lens material is contacted, and the ultraviolet curable adhesive is cured by irradiating ultraviolet rays, and the contact lens material is cut and then deformed by applying an external force to the side surface of the contact lens material processing support. Thus, the contact lens material is separated from the contact lens material processing support.

  According to the present invention, when the contact lens material is removed after being cut and polished, the lens material is not damaged or soiled, and the lens material can be removed stably.

  The contact lens material processing support of the present invention has an adhesive surface, and the contact lens material processing used for cutting and polishing the contact lens material after adhering the contact lens material to the adhesive surface via an adhesive The support is made of a resin, and the adhesive surface has a convex surface at the central portion, and an adhesive pool portion at the peripheral edge portion.

  When the contact lens material processing support of the present invention is released after cutting the contact lens material, the side surface of the contact lens material processing support is deformed by applying an external force to the contact lens material processing support. It is necessary to be. As the resin, when an ultraviolet curable adhesive is used, any resin that transmits ultraviolet light or visible light in the wavelength region used for curing can be used without limitation. Specifically, polymethyl methacrylate, polystyrene, polycarbonate and the like are mentioned as preferable materials, particularly from the viewpoint of ease of molding of the support, light transmittance, processability of the contact lens material, and deformability when removing the lens. Polystyrene is preferred.

  Further, the support for processing a contact lens material of the present invention is characterized in that it has a convex surface at the center of the adhesion surface to which the contact lens material is adhered, and an adhesive pool at the peripheral edge. By providing an adhesive pool in the peripheral part of the adhesive surface, the thickness of the peripheral part of the adhesive increases, and the amount of adhesive when the lens material is pressed against the adhesive surface through the adhesive before curing Even when there is a large amount of pressure or when the pressing depth is large, the amount of protruding adhesive can be reduced, preventing the protruding adhesive from entering the upper side of the lens material and preventing the lens material from being detached. be able to.

  In the present invention, the adhesive pool portion may have any shape as long as the thickness of the adhesive is larger than the adhesive thickness at the central portion of the adhesive surface when the contact lens material is bonded. A shape that is convex in the direction opposite to the convex surface at the center of the adhesive surface is particularly preferable because it can effectively prevent the adhesive from wrapping around the upper side of the contact lens material.

  A contact lens material processing apparatus includes the contact lens material processing support described above, a cutting means for cutting the contact lens material, and a narrow pressure means for applying an external force to the side surface of the contact lens material processing support. To do.

  The contact lens material fixed on the support for processing the contact lens material is cut using the cutting means, so high-precision cutting is possible, and external force is applied to the side surface of the support for processing the contact lens material using the narrow pressure means. By adding, the processed contact lens material can be stably detached.

  The contact lens manufacturing method of the present invention has an adhesive surface, an adhesive surface of a resin contact lens material processing support having a convex surface at a central portion of the adhesive surface and an adhesive pool portion at a peripheral portion of the adhesive surface. The contact lens material is contacted via an ultraviolet curable adhesive, irradiated with ultraviolet rays to cure the ultraviolet curable adhesive, and after cutting the contact lens material, the side surface of the contact lens material processing support The contact lens material is detached from the support for processing the contact lens material by applying an external force to the contact lens material and deforming the contact lens material.

  By using a resin contact lens material processing support that has an adhesive surface, a convex surface at the center of the adhesive surface, and an adhesive pool at the periphery of the adhesive surface, the ultraviolet curable adhesive protrudes. It is possible to prevent the contact lens material from going around the upper side.

  Moreover, even if it is a soft contact lens material, it can cut with high precision by using an ultraviolet curable adhesive, and cutting after irradiating and hardening an ultraviolet-ray.

  Furthermore, the contact lens material after processing can be stably detached by applying an external force to the side surface of the support for processing the contact lens material after deformation.

  Hereinafter, in order to describe the present invention more specifically, representative examples of the present invention will be described in detail with reference to the drawings.

  First, a process for processing a contact lens material using an example of the support for processing a contact lens material of the present invention will be described with reference to FIGS. FIG. 1 is a sectional view of a contact lens material processing support of the present invention. The contact lens material processing support 1 is preferably composed of a protrusion 2 and a holding part 3. The tip surface of the projection 2 forms an adhesive surface 4, which is substantially the same as the base curve surface of the contact lens material 6 in which a base curve surface having a concave surface with a desired curvature is first processed at the center of the adhesive surface 4. It has a shape having a corresponding convex surface 5. The curvature of the convex surface 5 is preferably the same as the curvature of the contact lens because the contact lens material can be cut uniformly and accurately. As shown in FIG. 2, with this configuration, the support 1 for processing a contact lens material is held by adhering an adhesive surface 4 of the protrusion 2 and a contact lens material 6 formed with a base curve surface via an adhesive 7. Is done.

  The contact lens material processing support of the present invention is characterized in that an adhesive pool 8 is provided at the peripheral edge of the adhesive surface 4. As described above, the shape of the adhesive pool portion 8 may be any shape as long as the adhesive thickness is larger than the adhesive thickness at the central portion of the adhesive surface when the contact lens material is bonded. A shape that is convex in the direction opposite to the convex surface at the center of the surface is particularly preferable because it can effectively prevent the adhesive from wrapping around the upper side of the contact lens material. Moreover, it is preferable to provide the position where the adhesive pool part 8 is provided so that it may be located in the outer peripheral part of the optical surface of a contact lens in which especially high cutting accuracy is calculated | required. When the shape of the adhesive pool portion is convex in the direction opposite to the convex surface of the central portion of the adhesive surface, the adhesive pool portion in the cross section including the central axis of the contact lens material processing support 1 is configured. It is preferable that the curve has a radius of curvature of 1.0 mm or less.

  FIG. 2 is a cross-sectional view showing a state in which the contact lens material is bonded to the contact lens material processing support of the present invention.

  The contact lens material processing apparatus of the present invention requires cutting means. The cutting means may be any known method such as a lathe. In addition, providing a means for polishing the lens surface before removing the contact lens material from the support is also preferably used in terms of production efficiency.

  FIG. 3 is a cross-sectional view showing a state in which the contact lens material bonded to the contact lens material processing support of the present invention is cut. The contact lens material processing apparatus of the present invention has a narrow pressure means 10. The narrow pressure means 10 may be any known means, but it needs a function of applying an external force to the side surface of the contact lens material processing support 1, and can narrow the pressure perpendicular to the thickness direction of the contact lens material. A jig is preferably used. More preferably, a narrow pressure means or a contact lens material processing support is rotated, and a jig capable of narrowing pressure over the entire side surface of the contact lens material processing support is used.

  FIG. 4 is a cross-sectional view showing a state in which a contact lens material bonded to a conventional support for processing a contact lens material is cut.

  When the contact lens material processing support of the present invention is used, the adhesive 7 that protrudes as shown in FIG. 3 does not enter the upper side of the contact lens material. By deforming the side surface of the body 1 by applying an external force, the contact lens material 6 can be stably detached from the contact lens material processing support 1, but a conventional contact lens material processing support is used. In such a case, the adhesive 7 that protrudes as shown in FIG. 4 may wrap around to the upper side of the contact lens material, and it is applied to the side surface of the contact lens material processing support 1 using the narrow pressure means 10. There are cases where the contact lens material 6 cannot be successfully detached from the contact lens material processing support 1 even when deformed by applying an external force.

  The holding portion 3 of the contact lens material processing support 1 is disposed at the lower end of the projection 2 and has a substantially thick flange shape so as to project a predetermined dimension radially outward and continuously extend in the circumferential direction. It is preferable to form with a form. With this structure, the outer peripheral surface of the holding portion 3 can be attached to a processing apparatus, and a surface on the side different from the base curve surface of the contact lens material 6 can be cut and polished to form a front curve to produce a contact lens. .

  It is preferable to provide a recess 9 that opens downward in the interior of the projection 2 of the contact lens material processing support 1. The recess 9 is preferably formed to have a diameter smaller than the outer diameter of the protrusion 2, and the protrusion 2 is preferably configured with a substantially uniform thickness as a whole. With such a structure, the contact lens formed on the surface of the support can be easily detached by narrowing the pressure with the narrow pressure means 10.

  As the resin of the support, it is preferable from the viewpoint of productivity that the holding portion 3 and the protruding portion 2 are an integrally molded product made of the same material. As the resin, when an ultraviolet curable adhesive is used, it can be used without limitation as long as it transmits ultraviolet light used for curing the adhesive. Specifically, polymethyl methacrylate, polystyrene, polycarbonate and the like are mentioned as preferable materials, particularly from the viewpoint of ease of molding of the support, light transmittance, processability of the contact lens material, and deformability when removing the lens. Polystyrene is preferred.

  In order to adhere the contact lens material to the support, any known adhesive may be used, but an ultraviolet curable adhesive is preferably used from the balance between transparency and hardness after curing. The ultraviolet curable adhesive is composed of a mixture of a photocurable resin and a photopolymerization initiator.

  The photocurable resin is preferably a photocurable monomer, a photocurable oligomer, or a photocurable polymer. However, since the contact lens is a medical device, it is preferable that it does not penetrate into the contact lens material and is UV curable. Polymers such as polyester acrylate, epoxy acrylate, polyurethane acrylate, polyether acrylate, oligo acrylate, alkyd acrylate, polyol acrylate, etc. are mentioned. Is particularly preferred. Examples of polyurethane acrylates include, but are not limited to, phenyl glycidyl ether acrylate hexamethylene diisocyanate polymer, glycerin dimethacrylate hexamethylene diisocyanate polymer, pentaerythritol triacrylate isophorone diisocyanate polymer, and the like. These photocurable materials may be used alone or in combination of two or more.

  Any photopolymerization initiator can be used as long as it absorbs light in the ultraviolet region or visible region to generate radicals. Examples of those that absorb ultraviolet rays to generate radicals include benzyl, benzoin isobutyl ether, Benzoin isopropyl ether, benzophenone, 4-benzoyl-4'methyldiphenyl sulfide, benzyldimethyl ketal, 2-chlorothioxanthone, 2,4-diethylthioxanthone, 2,4-diisopropylthioxanthone, 2,4-dimethyl Thioxanthone, 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenyl-propan 1-one, 2-hydroxy-2-methyl-1- [4- (1-methylvinyl) phenyl] propanone , Isopropylthioxanthone, Although such chill benzoyl formate and the like, but are not limited to, it may also be used in combination of two or more kinds in combination. These photoinitiators are preferably used in a proportion of 0.1 to 10% on a weight basis with respect to the photocurable material, and more preferably in a proportion of 0.2 to 5%. In addition to these, if necessary, a solvent, a thermal polymerization inhibitor, a filler, a stabilizer and the like may be added to the adhesive as long as the material of the contact lens material is not affected.

  In the present invention, it is also preferable to use a photosensitizer together with the photopolymerization initiator as necessary. This photosensitizer exhibits an excellent curing effect when used with a photoinitiator. Examples of photosensitizers include 2-dimethylaminoethyl benzoate, ethyl P-dimethylaminobenzoate, triethanolamine, methyldiethanolamine, triisopropanolamine, n-butylamine, diethylaminoethyl methacrylate, etc. However, these may be used alone or in combination of two or more.

  In addition, the UV curable adhesive can be processed more accurately when the hardness after curing is higher. In terms of processing accuracy, the Shore D hardness after curing is preferably 10 or more, more preferably 20 or more.

  When the thickness of the UV curable adhesive at the center of the adhesive surface at the time of bonding is too thick, the cutting surface will be deformed due to the pressing of the cutting edge of the cutting tool, the lens shape will become unstable and stable power will not be obtained, If the thickness is too thin, the cutting surface is likely to be affected by the vibration of the processing machine, and the thickness of the adhesive is preferably 0.01 to 0.1 mm.

  As a method of using the support for processing contact lens material according to the present invention, the contact lens material and the support are brought into contact with each other using the above-mentioned UV curable adhesive, and then the UV light is irradiated to cure the adhesive. It is preferable to make it. The light source may be anything in the wavelength range of 200 to 400 nm. For example, a low pressure mercury lamp, a high pressure mercury lamp, an ultrahigh pressure mercury lamp, an ultraviolet ray lamp, a xenon lamp, or the like can be used. The irradiation direction of the ultraviolet rays may be either the contact lens material or the support side depending on the light transmission performance of the contact lens material and the support. However, in order to irradiate the light uniformly and obtain a uniform adhesive layer, the contact lens at the time of light irradiation It is preferable to rotate the material processing support.

EXAMPLES Next, the present invention will be specifically described by way of examples, but the present invention is not limited by these.
Example 1
Using a contact lens lathe, a concave surface serving as a base curve surface was formed on one surface of a 10 mmφ cylindrical contact lens material with a curvature of 8.0 mm.

  As a UV curable adhesive, 100 parts by weight of a urethane acrylate polymer (manufactured by Shin-Nakamura Chemical Co., Ltd., UA-160TM) kept at 80 ° C., 3.0% of a photopolymerization initiator (Lamberti spa, Esacure KIP-100F) Part by weight was mixed and stirred for 30 minutes to obtain an ultraviolet curable adhesive.

  A convex surface with a curvature of 8.0 mm is formed on the bottom surface of a cylindrical material of 10 mmφ made of polystyrene, and an adhesive pool portion having a semicircular cross section with a width of 0.5 mm is formed at the end portion. A contact lens material processing support having a convex surface and an adhesive surface having an adhesive pool in the peripheral edge portion was prepared.

15 mg of UV curable adhesive is dropped on the concave surface of the contact lens material that becomes the base curve surface, and is brought into close contact with the convex surface of the contact lens material processing support so that the thickness of the adhesive is 0.1 mm. Irradiation was performed at 200 mW / cm ² and an irradiation distance of 50 mm for 10 seconds to bond the contact lens material and the support for processing the contact lens material. Thereafter, the front curve surface of the contact lens material of the support was cut. Thereafter, when the support was narrowed from the side by a narrow pressure device and the lens was detached, the lens was easily peeled off. Subsequently, the same operation was repeated for 99 contact lenses. All 99 contact lenses could be easily detached.

When the appearance of the detached lens was inspected, no scratches or dirt were attached to all 100 prepared lenses.
Example 2
100 contact lenses were prepared and detached in the same manner as in Example 1 except that the width of the adhesive pool portion was 1.0 mm. All 100 lenses could be easily detached and were detached. When the appearance of the contact lens was inspected, no scratches or dirt were attached to all of the contact lenses.
Comparative Example 1
100 contact lenses were prepared in the same manner as in Example 1 except that the adhesive pool was not formed, and when trying to detach with a narrow pressure detachment device, 28 contact lenses protruded. It was caught by the agent and did not peel off. Of the 72 pieces peeled off, dirt adhered to the periphery of 10 contact lenses.
Comparative Example 2
A contact lens was prepared in the same manner as in Example 1 except that 20 mg of an ultraviolet curable adhesive was dropped, and when it was attempted to be detached with a narrow pressure detaching device, 15 contact lenses protruded into the UV adhesive. It was caught and not peeled off. No scratches or dirt were attached to the 85 contact lenses.

It is sectional drawing of the support body for contact lens material processing of this invention. It is sectional drawing which showed the state which adhere | attached contact lens material on the support body for contact lens material processing of this invention. It is sectional drawing which showed the state which cut the contact lens material adhere | attached on the support body for contact lens material processing of this invention. It is sectional drawing which showed the state which cut the contact lens material adhere | attached on the support body for the conventional contact lens material processing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Contact lens material processing support body 2 Protrusion part 3 Holding | maintenance part 4 Adhesive surface 5 Convex surface 6 Contact lens material 7 Adhesive 8 Adhesive pool part 9 Concave part 10 Narrow pressure means

Claims (3)

A support for processing a contact lens material used for cutting and polishing the contact lens material after bonding the contact lens material to the adhesive surface via an adhesive, comprising a resin, and The contact lens material processing support according to claim 1, wherein the adhesive surface has a convex surface at a central portion and an adhesive pool portion at a peripheral edge portion. The contact lens material processing support according to claim 1, comprising: a cutting means for cutting the contact lens material; and a narrow pressure means for applying an external force to a side surface of the contact lens material processing support. Processing equipment. Contact with the adhesive surface of the resin contact lens material processing support having an adhesive surface, a convex surface at the center of the adhesive surface, and an adhesive pool at the periphery of the adhesive surface via an ultraviolet curable adhesive The lens material is brought into contact, irradiated with ultraviolet rays to cure the ultraviolet curable adhesive, and after cutting the contact lens material, an external force is applied to the side surface of the contact lens material processing support to deform the contact lens material. A method of manufacturing a contact lens, wherein the contact lens material is detached from the contact lens material processing support.

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