JP2010264621A - Method for producing plastic lens - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a plastic lens which can simultaneously produce a plurality of lenses by a casting polymerization method. <P>SOLUTION: The method of manufacturing the plastic lens includes a casting process in which a curable raw material composition is filled in the cavities C1, C2, and C3 of a shaping mold 10 formed of molds 11, 12, 13, and 14 which are arranged oppositely at prescribed intervals and an adhesive tape 31 wound around its peripheral edge, and a polymerization process for polymerizing/curing the raw material composition. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a plastic lens.

  When producing a plastic lens having excellent optical performance, a casting polymerization method is generally used. As the casting polymerization method, a mold for molding one lens surface and a mold for molding the other lens surface facing each other at a predetermined interval are used. A method of injecting a raw material composition to polymerize and cure is widely known (see, for example, Patent Document 1). Specifically, when assembling the molding mold, as shown in FIG. 5, while holding and rotating the lens molds 21 and 22 with the jigs 101 and 102, the adhesive tape 31 is pressed between the lens molds 21 and 22 by the pressing roll 150. Paste to the outer peripheral side. And the molding mold 200 as shown in FIG. 6 is obtained. The molding mold 200 has a structure in which the outer periphery of the lens molds 21 and 22 is wound by an adhesive tape 31 including an outer layer 31A and an adhesive layer 31B, and includes a cavity C as a space inside. Then, as shown in FIG. 7, a nozzle N is inserted into the cavity C through a hole formed in a part of the adhesive tape 31 that forms the outer periphery of the molding mold 200, and the curable raw material composition is injected and filled into the cavity C. To do. Thereafter, the raw material composition is polymerized and cured by heat or ultraviolet irradiation. After the polymerization curing is completed, the molding mold 200 is disassembled and the plastic lens is taken out.

Japanese Examined Patent Publication No. 63-23890

  However, in the conventional molding mold described above, only one lens can be manufactured from one molding mold, and the manufacturing efficiency is extremely low.

  Then, an object of this invention is to provide the manufacturing method of the plastic lens which can manufacture a some lens simultaneously by the casting polymerization method.

  In order to solve the above-described problems, the present invention provides a molding mold formed of a plurality of molding molds arranged to face each other at a predetermined interval and a sealing tape wound around the periphery of the plurality of molding dies. In the method of manufacturing a plastic lens having an injection step of filling a curable raw material composition into a cavity and a polymerization step of polymerizing and hardening the raw material composition, the number of the molds is three or more. And

  According to the method for producing a plastic lens of the present invention, there are three or more molding dies constituting the molding mold. Therefore, two or more cavities are formed in the molding mold. Therefore, if these cavities are filled with a curable raw material composition and the raw material composition is polymerized and cured, two or more plastic lenses can be manufactured simultaneously. Therefore, the manufacturing efficiency of the plastic lens is dramatically improved.

In the present invention, it is preferable that at least one of the molds is formed by bonding two or more mold materials.
Here, as long as bonding and dissociation of mold materials are easy, the method of bonding the mold materials is not particularly limited. For example, various methods such as bonding with an adhesive, fitting with a male protrusion and a female protrusion, or a screw type are preferably used.
According to the invention of this configuration, since at least one of the molds is formed by bonding two or more mold materials, it is possible to increase the types of lenses that can be manufactured by combining various mold materials. Manufacturing efficiency can be further improved.

In the present invention, the material of the mold is preferably inorganic glass.
According to the invention of this configuration, since the material of the mold is inorganic glass, a plurality of plastic lenses excellent in dimensional stability can be efficiently manufactured.

In the present invention, the curable raw material composition is preferably a monomer composition for a thiourethane resin.
According to the invention of this configuration, since the curable raw material composition is a monomer for a thiourethane resin, a plurality of plastic lenses having a high refractive index can be efficiently produced.

In the present invention, the plastic lens is preferably a spectacle lens.
According to the invention of this configuration, since the plastic lens is a spectacle lens, it is possible to simultaneously manufacture various types of spectacle lenses. In particular, the left lens and the right lens of the spectacles can be manufactured at the same time, which not only improves the manufacturing efficiency but also is extremely effective in manufacturing management.

It is sectional drawing of the mold for shaping | molding in this embodiment. In this embodiment, it is a perspective view which shows the assembly process of the mold for shaping | molding. In this embodiment, it is a figure which shows the assembly process of the shaping | molding mold from a side surface. In this embodiment, it is sectional drawing which shows the variation of the bonding type | mold which comprises the mold for shaping | molding. It is sectional drawing which shows the assembly process of the shaping | molding mold in a prior art. It is sectional drawing of the mold for shaping | molding in a prior art. In a prior art, it is the schematic which shows the process of injecting and filling a curable raw material composition to a shaping | molding mold.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The plastic lens in this embodiment is a spectacle lens.

[Configuration of mold for molding]
FIG. 1 is a cross-sectional view showing a molding mold 10 for producing a plastic lens by cast polymerization.
As shown in FIG. 1, the molding mold 10 in this embodiment includes four inorganic glass lens molds 11, 12, 13, and 14 that are arranged to face each other at a predetermined interval, and an adhesive wound around the periphery thereof. And the tape 31. The adhesive tape 31 includes an outer layer 31A and an adhesive layer 31B.
Three cavities C1, C2, and C3 are formed between the four lens molds 11, 12, 13, and 14.
Here, as in the conventional lens mold, the molds 11 and 14 are lens mold mold surfaces only, and are also referred to as outer molds in this embodiment. On the other hand, the molds 12 and 13 have lens mold surfaces on both surfaces, and are also referred to as inner molds in this embodiment.

[Assembly of molding mold]
FIG. 2 is a perspective view showing the assembly process of the molding mold 10 described above, and FIG. 3 is a cross-sectional view showing the assembly process of the molding mold 10. Hereinafter, the assembly process of the molding mold will be described based on these drawings.

(1) Lens mold positioning step First, lens molds 11 and 14 which are outer molds are arranged at predetermined intervals by jigs 101 and 102. Specifically, the inner lens forming dies 12 and 13 are placed in arc-shaped concave portions 61A and 62A provided on the upper portions of the pedestals 61 and 62, and the pedestals 61 and 62 are moved in the direction of the jigs 101 and 102. To position the inner mold.
Thereafter, as shown in FIGS. 2, 3A, and 3B, the three rolls 51, 52, and 53 are moved to support the lens forming dies 11, 12, 13, and 14, and the pedestals 61 and 62 are moved. Move down.
In addition, rubber films 51A, 52A, and 53A as elastic members are formed on the surfaces of the rolls 51, 52, and 53.

(2) Tape winding step Next, as shown in FIGS. 2 and 3C, the three lens rolls 51, 52, and 53 are rotated to rotate the lens molds 11, 12, 13, and 14. The wound adhesive tape 31 is wound while adhering to the peripheral edges of the lens molds 11, 12, 13, and 14. Finally, a molding mold 10 as shown in FIG. 1 is obtained.

[Plastic lens manufacturing process]
The cavities C1, C2, and C3 of the assembled mold 10 are each injected and filled with the curable raw material composition (injection step). As the injection method, the same method as in FIG. 7 of the prior art can be adopted. At that time, the raw material composition may be injected and filled in order into the cavities C1, C2, and C3 using only one nozzle N, or three nozzles N are prepared and filled into the cavities C1, C2, and C3 simultaneously. May be.
When the injection of the raw material composition is completed, the molding mold 10 is irradiated with ultraviolet rays or the like to cure the internal raw material composition (polymerization step). Thereafter, the molding mold 10 is disassembled and the spectacle lens is taken out. Note that the raw material composition may be cured by heat.
The curable raw material composition as the lens raw material is not particularly limited, and examples thereof include diethylene glycol bisallyl carbonate (CR-39). When a thiourethane resin is used as a lens material for a high refractive index, a polyisocyanate having two or more isocyanate groups and a compound having two or more active hydrogens are mainly used as raw materials. A raw material composition as a component may be used.

[Effects of this embodiment]
The present embodiment is a method for simultaneously producing a plurality of spectacle lenses by performing cast polymerization using a lens mold having a plurality of cavities. According to the above embodiment, the following effects can be obtained.
(1) The molding mold 10 includes four lens molding dies 11, 12, 13, and 14. Therefore, the molding mold 10 has three cavities C1, C2, and C3. Therefore, three plastic spectacle lenses can be manufactured simultaneously by filling these cavities with a curable raw material composition and polymerizing and curing the raw material composition. Therefore, the manufacturing efficiency of the plastic lens is dramatically improved.

(2) Since two of the cavities C1, C2, and C3 can be used to manufacture the left lens and the right lens of the glasses at the same time, not only the manufacturing efficiency is high, but also in the management of the spectacle lenses. Are better.
(3) By using a monomer composition for a thiourethane resin as a curable raw material composition, a high refractive index spectacle lens can be efficiently produced.

In addition, this invention is not limited to each embodiment mentioned above, The deformation | transformation shown below is included in the range which can achieve the objective of this invention.
For example, in the present embodiment, when assembling the molding mold 10, the pedestals 61 and 62 having the arc-shaped recesses 61 </ b> A and 61 </ b> B are used for positioning the inner mold, or three rolls 51 are used for winding the adhesive tape 31. Although the lens molds 11 to 14 were fixed and rotated by using -53, it is sufficient that the molding mold 10 can be finally formed, and the method for that is not limited.

  In this embodiment, four lens molds are used to simultaneously manufacture three spectacle lenses. However, two lens molds are used and two spectacle lenses are simultaneously used (for example, for the left eye and for the right eye). May be manufactured simultaneously, or four or more spectacle lenses may be manufactured simultaneously using five or more lens molds.

Furthermore, at least one of the lens molds may be formed by bonding two or more mold materials. For example, in the case of an inner mold, as shown in FIG. 4A, the lens mold 15 may be formed by bonding a lens convex surface forming mold material 15A and a lens convex surface forming mold material 15B. Alternatively, as shown in FIG. 4B, the lens mold 16 may be formed by bonding the lens concave surface forming mold material 16A and the lens convex surface forming mold material 16B. Further, as shown in FIG. 4C, the lens molding die 17 may be formed by bonding a lens concave surface forming mold material 17A and a lens concave surface forming mold material 17B. It is preferable to use engagement members 15C, 16C, and 17C having appropriate shapes for bonding between the above-described mold members. These engaging members are just sized to fit into holes formed in the mold material. In addition, the method of bonding the mold materials is not particularly limited as long as the mold materials can be easily bonded and dissociated. For example, various methods such as bonding with an adhesive, fitting with a male protrusion and a female protrusion, or a screw type are preferably used. As described above, since at least one of the molds is formed by bonding two or more mold materials, it is possible to increase the types of lenses that can be manufactured by combining the mold materials in various ways, and further increase the manufacturing efficiency of the plastic lens. Can be improved.
In the present embodiment, the plastic lens has been described as a spectacle lens, but it need not be a spectacle lens, and can be applied to various optical lenses such as a microscope and a telescope.

DESCRIPTION OF SYMBOLS 10,200 ... Mold for molding, 11-17 ... Lens molding die, 15A, 15B, 16B ... Mold material for lens convex surface formation, 16A, 17A, 17B ... Mold material for lens concave surface formation, 21, 22 ... Lens mold, 31 ... Adhesive Tape, 31A ... outer layer, 31B ... adhesive layer, 51, 52, 53 ... roll, 51A, 52A, 53A ... rubber film, 61, 62 ... pedestal, 61A, 62A ... arc-shaped recess, 101, 102 ... jig, 150 ... Pressing roll, C, C1-C3 ... Cavity

Claims (6)

Fill the mold mold cavity formed by a plurality of molds facing each other at a predetermined interval and a sealing tape wound around the periphery of the molds with a curable raw material composition. An injection process to
A polymerization step of polymerizing and curing the raw material composition;
In the manufacturing method of the plastic lens having
There are three or more molds. A method for producing a plastic lens. In the manufacturing method of the plastic lens of Claim 1,
At least one of the molds is formed by bonding two or more mold materials. A method for producing a plastic lens, wherein: In the manufacturing method of the plastic lens of Claim 1 or Claim 2,
A method for producing a plastic lens, wherein the material of the mold is inorganic glass. In the manufacturing method of the plastic lens in any one of Claim 1- Claim 3,
The method for producing a plastic lens, wherein the curable raw material composition is a monomer composition for a thiourethane resin. In the manufacturing method of the plastic lens in any one of Claim 1- Claim 4,
The method for producing a plastic lens, wherein the plastic lens is a spectacle lens. In the manufacturing method of the plastic lens of Claim 5,
A method for producing a plastic lens, comprising producing a left lens and a right lens of an eyeglass simultaneously.

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