JP2014167533A - Method of forming photochromic film for spectacle lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a photochromic film at a reduced cost without restrictions on type of a spectacle lens base material for use so that uneven color development does not occur in the spectacle lens base material composed of a finish lens.SOLUTION: A method of forming a photochromic film for a spectacle lens includes an application step S2 of applying a photochromic solution to one lens surface 2a of a spectacle lens base material 2. The method includes a curing step of irradiating the lens surface 2a having the photochromic solution applied thereto with ultraviolet rays in an ultraviolet irradiation device 61. Before the spectacle lens base material 2 is carried into the ultraviolet irradiation device 61, a lens holding step is executed where the other lens surface 2b of the spectacle lens base material 2 is sucked to a suction type lens holding member 1 having a sucker part made of a material to which heat hardly transfers, to form an assembly A comprising the spectacle lens base material 2 and the lens holding member 1. The curing step is executed in a state where the assembly A is kept at a temperature of an environment in which the ultraviolet irradiation device 61 is placed is carried into the ultraviolet irradiation device 61 and the lens holding member 1 is supported on a support table 62 in the ultraviolet irradiation device 61.

Description

  The present invention relates to a method for forming a photochromic film for spectacle lenses in which a photochromic film on a spectacle lens substrate is irradiated with ultraviolet rays to cure the photochromic film.

  Conventionally, as a spectacle lens, for example, there is a light control lens that develops a color when receiving ultraviolet rays outdoors. This type of light control lens is formed by applying a photochromic liquid to a spectacle lens substrate and curing the photochromic liquid. As the photochromic liquid, an ultraviolet curable liquid is generally used.

Curing of this type of photochromic liquid is performed by, for example, supporting a spectacle lens substrate on a support base as described in Patent Document 1, and irradiating the spectacle lens substrate with ultraviolet rays.
The support stand disclosed in Patent Document 1 is for adsorbing and supporting the spectacle lens substrate by so-called vacuum adsorption.

  This support base has a structure in which an eyeglass lens is supported at the upper end. A seal member such as an O-ring or a V-ring is provided at the upper end portion of the support base, and an air suction port for sucking air inside the seal member is formed. The spectacle lens base material described in Patent Document 1 is assembled so as to form one assembly on a disc adsorbed by the support base.

  The assembly is formed such that the spectacle lens substrate and the disc are located on the same axis, and are separated from each other at a predetermined interval. In order to form the assembly by the spectacle lens substrate and the disc, a tape is wound around the outer peripheral surfaces of these two members.

JP 2012-24744 A

The inventor considers the spectacle lens base material to be directly adsorbed to the seal member of the support base. This is because when an eyeglass lens base material is combined with a disk to form an assembly, the manufacturing cost increases and the eyeglass lens base material with a narrow edge surface cannot be used.
However, when the plurality of spectacle lens base materials are each supported on the support base by such a support method and the ultraviolet irradiation is repeatedly performed, the problem described later occurs when the spectacle lens base material is a finish lens. A finish lens is one in which both lens surfaces of a spectacle lens substrate are finished to a complete state. The thickness of this finish lens is significantly thinner than a semi-finished lens in which one lens surface is unprocessed.

  When the spectacle lens substrate coated with the photochromic liquid is irradiated with ultraviolet rays, the temperature of the spectacle lens substrate increases for the following two reasons. The first reason is that heat is generated when the photochromic liquid is cured. The second reason is that the ultraviolet ray absorbent in the spectacle lens substrate absorbs the ultraviolet ray, so that the ultraviolet ray is converted into heat energy and released into the spectacle lens substrate. The heat of the spectacle lens base material raises the temperature of the seal member and is transmitted to the support base via the seal member. The temperature of the sealing member and the support base gradually increases as the number of times of ultraviolet irradiation (the number of eyeglass lens substrates to be cured) increases due to the heat transfer.

  The temperature of the spectacle lens substrate before the ultraviolet irradiation is the same as the room temperature. When the eyeglass lens substrate having such a temperature comes into contact with the high-temperature seal member, the temperature of the portion of the lens surface in contact with the O-ring or V-ring partially rises. At this time, the shape of the range in which the temperature rises is an annular shape. A finish lens having a thin spectacle lens substrate is one in which heat applied to one lens surface is easily transferred to the other lens surface. For this reason, an annular high temperature part is generated on the lens surface to which the photochromic liquid is applied.

  The viscosity and surface tension of the uncured photochromic liquid change according to the temperature of the lens surface. Therefore, as described above, the thickness of the layer made of the photochromic liquid provided on the high temperature portion is changed by transferring the heat of the support base to the spectacle lens base material. When the layer made of this photochromic liquid is cured, photochromic films having locally different film thicknesses are formed. When this photochromic film is colored by irradiating it with ultraviolet rays, a portion having a different film thickness is colored in a color different from other portions, resulting in an uneven color development. That is, when a spectacle lens base material made of a finish lens is directly adsorbed to the support base, there is a problem that a light control lens that easily causes uneven coloring is produced.

  The present invention has been made to solve such a problem, and can reduce the manufacturing cost, is not restricted by the type of the spectacle lens substrate to be used, and has spectacles made of a finish lens. It is an object of the present invention to provide a method for forming a photochromic film for a spectacle lens capable of forming a photochromic film so that color unevenness does not occur on a lens substrate.

  In order to achieve this object, a method for forming a photochromic film for spectacle lenses according to the present invention includes an application step of applying a photochromic liquid to one lens surface of an eyeglass lens base material, and the photochromic liquid applied And a curing step of irradiating the lens surface with ultraviolet rays within the ultraviolet irradiation device, and before the spectacle lens substrate is carried into the ultraviolet irradiation device, a sucker portion formed of a material that is difficult to conduct heat. A lens holding step of forming an assembly of the spectacle lens base material and the lens holding member by adsorbing the other lens surface of the spectacle lens base material to an adsorption type lens holding member having the curing step Carries the assembly maintained at the temperature of the environment in which the ultraviolet irradiation device is placed into the ultraviolet irradiation device, and the lens holding member is Is a method implemented in a state of being supported by the lens supporting portion of the line illumination device.

  According to the present invention, in the above invention, the lens holding step is performed by adsorbing a plurality of spectacle lens base materials to the lens holding member, and the curing step includes the spectacle lens base material and the lens holding member. It is characterized by being repeatedly performed by changing the assembly.

  According to the present invention, in the invention, the application step is performed using the spectacle lens substrate adsorbed on the lens holding member, and the spectacle lens is performed after the application step is performed until the curing step is completed. The substrate is kept in a state of being adsorbed by the lens holding member.

  The present invention is characterized in that, in the above invention, the sucker portion of the lens holding member is deformed into a shape following the other lens surface, and the lens surface is adsorbed.

According to the present invention, since the lens holding member substantially functions as a heat insulating material in the curing step, the spectacle lens base material is not heated by the lens support portion in the ultraviolet irradiation device. For this reason, the temperature distribution of the lens surface of the spectacle lens substrate becomes uniform in the curing step.
Since the lens holding member is a suction-type member having a suction cup portion, the spectacle lens substrate can be easily attached while keeping the manufacturing cost low without using a dedicated device. Further, since the sucker portion of the lens holding portion adsorbs the lens surface, there is no restriction on the thickness of the spectacle lens substrate.

  Therefore, it is possible to keep the manufacturing cost low, to be free from restrictions on the type of spectacle lens substrate used, and to prevent uneven coloring on the spectacle lens substrate made of the finish lens. A method for forming a photochromic film for spectacle lenses capable of forming a film can be provided.

It is a flowchart for demonstrating the film-forming method of the photochromic film | membrane for spectacle lenses based on this invention. It is sectional drawing of a spectacles lens base material and a lens holding member. It is sectional drawing which shows the state which loaded the lens holding member and the spectacles lens base material in the jig | tool for alignment. It is sectional drawing which shows the state by which the spectacles lens base material was adsorb | sucked to the lens holding member. It is sectional drawing which shows the structure of the coating device which implements an application | coating step. It is sectional drawing which shows the structure of the hardening apparatus which implements a hardening step. It is a graph which shows the relationship between the position of the lens surface of a spectacles lens base material, and the film thickness of a photochromic film.

Hereinafter, an embodiment of a method for forming a photochromic film for spectacle lenses according to the present invention will be described in detail with reference to FIGS.
As shown in FIG. 1, the method for forming a photochromic film for spectacle lenses according to this embodiment is a method performed by a lens holding step S1, a coating step S2, and a curing step S3.

The lens holding step S1 is a step of holding the spectacle lens substrate 2 on the lens holding member 1 shown in FIG. The lens holding step S1 according to this embodiment is performed by adsorbing a plurality of spectacle lens base materials 2 to a lens holding member 1 described later.
The application step S2 is a step of applying the photochromic liquid 3 (see FIG. 5) to one lens surface 2a (see FIG. 2) of the spectacle lens substrate 2.
The curing step S3 is a step of irradiating the spectacle lens substrate 2 coated with the photochromic liquid 3 with ultraviolet rays.

As shown in FIG. 2, the lens holding member 1 is connected to the suction cup portion 4 facing the other lens surface 2 b of the spectacle lens base material 2 and to the suction cup portion 4 on the side opposite to the spectacle lens base material 2. It is comprised by the support part 5 made.
The spectacle lens substrate 2 is a so-called finish lens, and is finished so that both the convex lens surface 2a and the concave lens surface 2b have a predetermined frequency.

The suction cup portion 4 includes a suction cup 6 formed in a shape that covers the lens surface 2b with a flexible material, and a filler 7 attached to the suction cup 6.
The suction cup 6 is formed of rubber in a bottomed cylindrical shape that opens to the spectacle lens substrate 2 side. The peripheral wall 6a that forms the outer peripheral portion of the suction cup 6 is inclined so as to be gradually located on the outer side in the radial direction as the distance from the bottom plate 6b increases. That is, the suction cup portion 4 is formed in a shape that can contact the outer peripheral portion of the lens surface 2b in a natural state.
An air chamber is formed inside the suction cup part 4 by the suction cup part 4 coming into contact with the outer peripheral part of the lens surface 2b.

  The filler 7 is formed in a disc shape so as to fill the air chamber 8 with a soft continuous porous material such as a so-called synthetic resin sponge. In addition, an open porous material means what is comprised with the open-cell body. That is, the suction cup part 4 is formed of a material that is difficult to conduct heat. The thickness of the filler 7 is formed so as not to protrude from the peripheral wall 6a toward the spectacle lens substrate 2 side. For this reason, when the concave surface (lens surface 2b) of the spectacle lens base material 2 is attracted to the suction cup part 4, the peripheral wall 6a (the part in contact with the outer peripheral part of the lens surface 2b in the suction cup part 4) is the filler 7 ( The lens surface 2b is brought into contact with the sucker portion 4 prior to the portion that contacts the central portion of the lens surface 2b. A convex piece 9 protruding toward the outside of the suction cup portion 4 is provided at an outer edge portion of the peripheral wall 6a that contacts the outer peripheral portion of the lens surface 2b.

On the bottom plate 6 b of the suction cup 6, a shaft 6 c extending on the opposite side to the spectacle lens substrate 2 is integrally formed. The shaft 6c is positioned on the same axis as the bottom plate 6b formed in a disc shape. The outer diameter of the shaft 6c is smaller than the outer diameter of the bottom plate 6b. A small hole 10 is formed at the center of the shaft 6c and the bottom plate 6b.
A metal plate bracket 11 is attached to the shaft 6c. This plate-shaped bracket 11 is for fixing the suction cup part 4 to the support part 5 mentioned later, and is fitted in the annular groove 12 formed in the axis | shaft 6c.

The support portion 5 includes a support plate 21 that is formed of a metal into a disc shape, and a check valve 22 that is provided at the axial center portion of the support plate 21.
An annular convex portion 23 is formed on the upper surface of the support plate 21 facing the suction cup portion 4. The convex portion 23 is positioned on the same axis as the support plate 21. A circular concave portion 24 into which the shaft 6 c of the suction cup 6 is fitted is formed in the axial center portion of the convex portion 23. The bottom surface of the circular recess 24 is formed flat so that an annular ridge 25 formed at the tip of the shaft 6c can contact the entire region. The protrusion 25 is for keeping the central portion of the circular recess 24 airtight.

The upper surface of the annular projection 23 is formed flat so that the plate bracket 11 can be overlaid. A plurality of screw holes 26 are formed in the convex portion 23. Fixing bolts 27 that pass through the plate bracket 11 are screwed into these screw holes 26. That is, the suction cup part 4 is fixed to the support part 5 by the fixing bolt 27 and the plate bracket 11.
On the other hand, the lower surface of the support plate 21 located on the side opposite to the suction cup portion 4 is formed to be a flat surface.

  An air hole 31 is formed in the axial center portion of the support plate 21 so as to penetrate the support plate 21 in the thickness direction. The air holes 31 are open to the bottom surface of the circular recess 24 and the lower surface of the support plate 21. In a state where the shaft 6 c is fitted in the circular recess 24, the air hole 31 is connected to the small hole 10 of the suction cup portion 4 in the circular recess 24, and the air chamber 8 is connected via the small hole 10. Connected to. That is, the small hole 10 and the air hole 31 constitute an air passage 32 extending from the suction cup portion 4 into the support portion 5. The air chamber 8 is communicated with the air passage 32.

  Although not shown in detail, the check valve 22 is constituted by a so-called ball check valve, and is press-fitted into the air hole 31. The check valve 22 allows air to flow only in the direction from the small hole 10 toward the air hole 31 and restricts the reverse flow of air to the air chamber 8 side.

  When adhering the spectacle lens substrate 2 to the lens holding member 1, a positioning jig 41 shown in FIG. 3 is used. The alignment jig 41 has the following three functions. The first function is a function of holding the lens holding member 1. The second function is a function of positioning the spectacle lens substrate 2 with respect to the lens holding member 1 on the same axis. A third function is a function of sucking out air from the suction cup portion 4 of the lens holding member 1.

  In order to realize these functions, the positioning jig 41 includes a base 42 on which the lens holding member 1 is placed, an outer peripheral surface 21 a of the support plate 21 of the lens holding member 1, and an outer peripheral surface of the spectacle lens substrate 2. And a vertical wall 43 to which 2c is fitted. The base 42 is formed in a disk shape. An O-ring 44 that contacts the lower surface of the support plate 21 is provided on the upper surface of the base 42. An air hole 45 is opened in an inner portion of the O-ring 44 in the base 42.

The air hole 45 is formed so as to extend from the opening on the upper surface of the base 42 to one side of the base 42 in the base 42. An air suction device 46 is connected to the air hole 45.
The vertical wall 43 can be formed in a cylindrical shape, or can be formed side by side in the circumferential direction of the base 42. The vertical wall 43 is formed with a first positioning portion 47 that fits the outer peripheral surface of the support plate 21 and a second positioning portion 48 that fits the outer peripheral surface of the spectacle lens substrate 2.

  In order to attract the eyeglass lens substrate 2 to the lens holding member 1 using the positioning jig 41, first, an operator (not shown) attaches the lens holding member 1 to the positioning jig 41. . At this time, the support plate 21 is placed on the O-ring 44 of the base 42 and the outer peripheral surface of the support plate 21 is fitted to the first positioning portion 47. Next, the operator places the spectacle lens substrate 2 on the lens holding member 1. At this time, the lens surface 2 b of the spectacle lens substrate 2 is overlaid on the suction cup portion 4 of the lens holding member 1, and the outer peripheral surface 2 c of the spectacle lens substrate 2 is fitted into the second positioning portion 48.

Thereafter, air in the air hole 45 of the base 42 is sucked by the air suction device 46. When the air in the air hole 45 is sucked, the check valve 22 is opened, and the air in the air hole 31, the small hole 10, and the air chamber 8 is sucked.
When the air in the air chamber 8 is sucked, as shown in FIG. 4, the suction cup 6 is elastically deformed so as to follow the shape of the lens surface 2b, and the filler 7 is compressed. It is adsorbed by the suction cup 4.

  The air suction device 46 is stopped after the spectacle lens substrate 2 is adsorbed to the lens holding member 1 as described above. An air suction passage (not shown) communicating with the air hole 45 is opened to the atmosphere, and the lens holding member 1 can be removed from the alignment jig 41. Since the check valve 22 is provided in the air passage 32 of the lens holding member 1, the inside of the air chamber 8 is maintained at a negative pressure, and the spectacle lens substrate 2 is maintained in a state of being adsorbed by the suction cup portion 4. . The assembly A composed of the spectacle lens base material 2 and the lens holding member 1 includes a coating device 51 (see FIG. 5) for performing the coating step S2 by an operator or a transport device (not shown), and a subsequent curing step. It is sent to the ultraviolet irradiation device 61 (see FIG. 6) that performs S3.

  The transport of the assembly A can be performed by an operator or a transport device holding the support plate 21 of the lens holding member 1. In order to release the state in which the spectacle lens substrate 2 is attracted to the lens holding member 1, the convex piece 9 of the suction cup portion 4 is pulled to separate a part of the peripheral wall 6 a from the spectacle lens substrate 2. When a gap is formed between the peripheral wall 6a and the spectacle lens substrate 2, the atmosphere is sucked into the suction cup 6 through this gap and the suction state is released.

As shown in FIG. 5, the coating step S <b> 2 is performed by loading the assembly A into the coating device 51. The coating device 51 includes a support base 52 that supports the assembly A, an application nozzle 53 positioned above the support base 52, and a casing 54 that surrounds the periphery of these members.
The support base 52 supports the support plate 21 by sucking the lower surface of the support plate 21. An annular seal member 55 is provided at the upper end portion of the support base 52, and an air hole 56 for sucking air inside the seal member 55 is formed. The air hole 56 communicates with an air suction device (not shown).

Air is sucked from the air passage in the assembly A through the check valve 22 by placing the assembly A on the seal member 55 and sucking air from the air hole 56 by the air suction device. For this reason, even when the air pressure in the air chamber 8 increases during conveyance and the force for attracting the spectacle lens substrate 2 to the suction cup portion 4 becomes weak, the assembly A is mounted on the coating device 51. It is possible to increase the force. That is, in all the assemblies A, the photochromic liquid 3 can be applied to the spectacle lens substrate 2 in a stable adsorption state.
The support base 52 is connected to a rotation drive device 57 and rotates at a predetermined rotation speed when the photochromic liquid 3 is applied.

The application nozzle 53 is for applying the photochromic liquid 3 to the spectacle lens substrate 2 of the assembly A placed on the support base 52.
The coating device 51 applies the photochromic liquid 3 to the lens surface 2b so that the thickness of the layer 58 made of the photochromic liquid 3 is uniform over the entire area of the lens surface 2a.
The spectacle lens substrate 2 on which the photochromic liquid 3 is applied to the lens surface 2 a by the coating device 51 is sent to the ultraviolet irradiation device 61 shown in FIG. 6 together with the lens holding member 1.

The ultraviolet irradiation device 61 is for performing the curing step S3. The ultraviolet irradiation device 61 includes a support base 62 that supports the assembly A, an ultraviolet lamp 63 positioned above the support base 62, and a casing 64 that surrounds these members.
The curing step S <b> 3 is performed in a state where the assembly A is carried into the ultraviolet irradiation device 61 and the lens holding member 1 is supported by the support base 62 in the ultraviolet irradiation device 61.

  The support table 62 supports the support plate 21 by sucking the lower surface of the support plate 21. An annular V-ring 65 is provided at the upper end of the support base 62, and an air hole 66 for sucking air inside the V-ring 65 is formed. The air hole 66 communicates with an air suction device (not shown).

  By placing the assembly A on the V-ring 65 and sucking air from the air hole 66 by the air suction device, air is sucked from the air passage in the assembly A through the check valve 22. For this reason, even when the air pressure in the air chamber 8 increases during conveyance and the force for attracting the spectacle lens substrate 2 to the suction cup portion 4 becomes weak, the assembly A is mounted on the ultraviolet irradiation device 61. By doing so, it is possible to increase the force. That is, in all the assemblies A, the spectacle lens substrate 2 can be irradiated with ultraviolet rays in a stable adsorption state.

The support base 62 is connected to a rotation driving device 67 and rotates at a predetermined rotation speed when the ultraviolet ray is irradiated. In this embodiment, the support base 62 of the ultraviolet irradiation device 61 corresponds to the “lens support” in the present invention.
The ultraviolet lamp 63 is for irradiating the photochromic liquid 3 on the spectacle lens substrate 2 with ultraviolet rays.
A nitrogen substitution device 68 is connected to the housing 64. The nitrogen replacement device 68 replaces air in the housing 64 with nitrogen gas before irradiating the spectacle lens substrate 2 with ultraviolet rays.
The spectacle lens substrate 2 and the lens holding member 1 are coupled to each other so as to become an assembly A before being loaded into the ultraviolet irradiation device 61. For this reason, the spectacle lens substrate 2 and the lens holding member 1 are loaded into the ultraviolet irradiation device 61 at a temperature substantially equal to the temperature of the environment where the ultraviolet irradiation device 61 is placed.

After the assembly A is loaded in the ultraviolet irradiation device 61, the nitrogen replacement device 68 replaces the air in the housing 64 with nitrogen gas in a predetermined time. The photochromic liquid 3 of the spectacle lens substrate 2 is a liquid having fluidity during the nitrogen replacement process. Conventionally, the heat of the V-ring and O-ring is transmitted to the spectacle lens base material in this nitrogen substitution step, and the temperature distribution of the spectacle lens base material is not uniform.
The photochromic liquid 3 is cured by being irradiated with ultraviolet rays in the ultraviolet irradiation device 61 to become a photochromic film. The temperature of the lens surface 2a when irradiated with ultraviolet rays is uniform over the entire area of the lens surface 2a because the temperatures of the spectacle lens substrate 2 and the lens holding member 1 are equal. For this reason, the photochromic film 69 is formed on the lens surface 2a so that the film thickness is uniform. Such a photochromic film 69 develops color so as not to cause uneven color development when irradiated with ultraviolet rays outdoors or the like.

The spectacle lens substrate 2 that has been irradiated with ultraviolet rays is taken out of the ultraviolet irradiating device 61 together with the lens holding member 1 and sent to a device that performs the next step (not shown).
The curing step S3 performed by the ultraviolet irradiation device 61 is repeatedly performed by replacing the assembly A. That is, after the previous assembly A is irradiated with ultraviolet rays and the assembly A is unloaded, the next assembly A is loaded, and the assembly A is irradiated with ultraviolet rays.

  The temperature of the spectacle lens substrate 2 when the spectacle lens substrate 2 is irradiated with ultraviolet rays in the ultraviolet irradiating device 61 is caused by the heat generated by the curing of the photochromic liquid 3 and the polymerization reaction of the spectacle lens substrate 2. It rises with fever. The eyeglass lens substrate 2 according to this embodiment is supported on a support base 62 via a lens holding member 1. For this reason, since the lens holding member 1 substantially functions as a heat insulating material, the heat of the spectacle lens base 2 is not transmitted to the support base 62.

  Even if the ultraviolet ray irradiation device 61 sequentially irradiates the plurality of assemblies A with ultraviolet rays and the temperature of the support base 62 rises temporarily, the lens holding member 1 substantially functions as a heat insulating material. That is, the spectacle lens substrate 2 is not heated by the support base 62 in the ultraviolet irradiation device 61. For this reason, in the curing step S3, the temperature distribution of the lens surface 2a becomes uniform.

  Since the lens holding member 1 is a suction-type member having the suction cup portion 4, the spectacle lens base 2 can be easily attached while keeping the manufacturing cost low without using a dedicated device. Further, the suction cup portion 4 of the lens holding member 1 has the lens surface 2b adsorbed thereto, so that the thickness of the spectacle lens substrate 2 is not restricted.

  Therefore, according to this embodiment, the manufacturing cost can be kept low, the type of the spectacle lens substrate 2 to be used is not restricted, and the color is developed on the spectacle lens substrate 2 made of a finish lens. It is possible to provide a method for forming a photochromic film for a spectacle lens capable of forming the photochromic film 69 so that unevenness does not occur.

The lens holding step S1 according to this embodiment is performed by adsorbing a plurality of spectacle lens base materials 2 to the lens holding member 1, respectively. The curing step S3 is repeatedly performed by changing the assembly A composed of the spectacle lens base 2 and the lens holding member 1.
For this reason, even when one ultraviolet irradiation device 61 is used with a plurality of spectacle lens base materials 2, a plurality of light control lenses having high quality without color unevenness can be manufactured.

  The application step S2 according to this embodiment is performed using the spectacle lens substrate 2 adsorbed on the lens holding member 1. The eyeglass lens substrate 2 is kept in the state of being attracted to the lens holding member 1 until the curing step S3 is completed after the application step S2 is performed.

For this reason, the spectacle lens base material 2 can be conveyed using the lens holding member 1 until the photochromic liquid 3 is cured after the photochromic liquid 3 is applied to the spectacle lens base material 2.
Therefore, according to this embodiment, the photochromic film 69 can be formed while keeping the lens surface 2a of the spectacle lens substrate 2 in a clean state, so that a light control lens with even higher quality can be manufactured. it can.

The suction cup portion 4 of the lens holding member 1 according to this embodiment is deformed into a shape following the other lens surface 2b, and this lens surface 2b is adsorbed.
For this reason, although the spectacle lens base material 2 is adsorbed to the lens holding member 1, no stress is generated that pulls down the central portion of the spectacle lens base material 2 in the adsorbed state. Therefore, even if the temperature of the spectacle lens substrate 2 is increased in the curing step S3, the spectacle lens substrate 2 is not deformed.

When the photochromic film was actually formed by the method for forming the photochromic film for spectacle lenses according to the above-described embodiment, the result shown in FIG. 7 was obtained.
In FIG. 7, the solid line indicates the film thickness of the photochromic film formed by the method of the present invention, and the broken line indicates the film thickness of the photochromic film formed by the conventional method. The conventional method is a method of irradiating ultraviolet rays by directly adsorbing the spectacle lens substrate 2 to the support base 62 of the ultraviolet irradiation device 61 so as to contact the V ring 65 without using the lens holding member 1. .
As can be seen from FIG. 7, in the conventional method, the film thickness greatly changes at the contact portion with the V ring 65. However, according to the present invention, the film thickness becomes uniform over substantially the entire area of the lens surface 2a.

  In the above-described embodiment, an example in which the lens holding step S1 is performed before the coating step S2 has been described. However, the lens holding step S1 can be performed after the coating step S2 and before the curing step S3.

  DESCRIPTION OF SYMBOLS 1 ... Lens holding member, 2 ... Eyeglass lens base material, 2a, 2b ... Lens surface, 3 ... Photochromic liquid, 4 ... Suction cup part, 5 ... Lens support part, 61 ... Ultraviolet irradiation apparatus, A ... Assembly, S1 ... Lens Holding step, S2 ... coating step, S3 ... curing step.

Claims (4)

An application step of applying a photochromic liquid to one lens surface of the spectacle lens substrate;
A curing step of irradiating the lens surface coated with the photochromic liquid with ultraviolet rays in an ultraviolet irradiation device;
Before the spectacle lens base material is carried into the ultraviolet irradiation device, the other lens surface of the spectacle lens base material is attached to a suction-type lens holding member having a suction cup portion made of a material that is difficult to conduct heat. A lens holding step is performed to adsorb and form an assembly of the spectacle lens substrate and the lens holding member;
In the curing step, the assembly maintained at the temperature of the environment where the ultraviolet irradiation device is placed is carried into the ultraviolet irradiation device, and the lens holding member is supported by a lens support portion in the ultraviolet irradiation device. A method for forming a photochromic film for spectacle lenses, which is performed in The method for forming a photochromic film for spectacle lenses according to claim 1, wherein the lens holding step is performed by adsorbing a plurality of spectacle lens base materials to the lens holding member, respectively.
The method of forming a photochromic film for a spectacle lens, wherein the curing step is repeatedly performed by changing an assembly composed of the spectacle lens base material and the lens holding member. The method for forming a photochromic film for spectacle lenses according to claim 1 or 2, wherein the applying step is performed using the spectacle lens base material adsorbed on the lens holding member,
A method for forming a photochromic film for spectacle lenses, wherein the spectacle lens substrate is maintained in a state of being adsorbed to the lens holding member after the coating step is completed until the curing step is completed.   4. The method for forming a photochromic film for spectacle lenses according to claim 1, wherein the suction cup portion of the lens holding member is deformed into a shape following the other lens surface. A method for forming a photochromic film for spectacle lenses, wherein the surface is adsorbed.

Images