JP2013054096A - Method of manufacturing spectacle lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide means of simply manufacturing a spectacle lens having a coating film with reduced effects of liquid pooling.SOLUTION: There is provided a method of manufacturing a spectacle lens having a coating film on a lens surface, including application of coating liquid to an applied surface 11 of a lens base material by a spin coating method. The applied surface 11 includes a lens effective surface 110 and a flange surface 111 surrounding the effective surface which are formed as a continuous surface, and the flange surface is removed after the application.

Description

  The present invention relates to a method for manufacturing a spectacle lens, and more particularly, to a method for manufacturing a spectacle lens capable of providing a spectacle lens in which the influence of a liquid pool of a coating liquid is reduced at a peripheral portion of a coating film surface. .

  In general, a spectacle lens achieves a desired refractive index with a lens base material, and various functions (light control performance, antireflection performance, improved durability, etc.) are imparted by a functional film provided on the base material. . As a method for forming such a functional film, spin coating is widely used (see, for example, Patent Documents 1 and 2).

JP 2009-285978 A JP 2005-246265 A

  In the spin coating method, a centrifugal force is applied from the central part to the peripheral part in the coating liquid applied on the lens base material, so that liquid pool is likely to occur in the peripheral part. If a coating film is formed through a drying process, a curing process, or the like in this state, a band-like (bank-like) portion that swells over the entire periphery of the surface periphery is formed in the resulting coating film. In particular, in a coating film (pigment film) containing a dye, the formation of such a portion having a different film thickness is manifested as color unevenness, which causes a decrease in the quality of the spectacle lens.

  As countermeasures against the above-mentioned liquid pool, Patent Document 1 proposes performing a curing process by ultraviolet irradiation during spin coating, and Patent Document 2 proposes scraping off the liquid pool using a spatula mechanism provided in the coating apparatus. Yes. Any of these methods is effective as a method for reducing the liquid pool, but since it is necessary to change the configuration of the existing coating apparatus, further improvement is required from the viewpoint of simplicity.

  Accordingly, an object of the present invention is to provide means for easily manufacturing a spectacle lens having a coating film in which the influence of a liquid pool is reduced.

The present inventor has intensively studied to achieve the above object. As a result, when producing a lens base material, it came to think that the said objective could be achieved by forming a to-be-coated surface in the magnitude | size exceeding a lens effective surface. As described above, in the spin coating method, the liquid pool is generated at the periphery of the coated surface due to the centrifugal force. If the coated surface is larger than the effective lens surface, the liquid pool is generated outside the effective lens surface. Can be made. It was thought that if the peripheral portion of the coated surface (outside the lens effective surface) where the liquid pool was generated after the coating process was removed, it would be possible to avoid a decrease in film thickness uniformity due to the liquid pool on the lens effective surface. is there.
As a result of further studies based on the above findings, the present inventor has completed the present invention.

That is, the above object was achieved by the following means.
[1] A method for producing a spectacle lens having a coating film on a lens surface, which comprises applying a coating liquid on a surface to be coated of a lens substrate by a spin coating method,
The coated surface is formed by forming a lens effective surface and a flange surface surrounding the effective surface as a continuous surface,
The method for manufacturing the spectacle lens, wherein the flange surface is removed after the application.
[2] The method for manufacturing a spectacle lens according to [1], wherein the coating liquid is a photochromic liquid containing a photochromic dye.
[3] The method for manufacturing a spectacle lens according to [1] or [2], wherein the surface to be coated has a convex shape.
[4] The lens base material is provided with a flange portion having an inner peripheral surface end portion formed horizontally or upward with respect to a horizontal plane over the entire circumference of the peripheral end portion of the flange surface. 3] The manufacturing method of the spectacle lens in any one of.

  According to the present invention, it is possible to provide a high-quality spectacle lens in which the influence of the liquid pool is eliminated.

It is the side view (upper figure) and top view (lower figure) which show the one aspect | mode of a lens base material. An example of a lens base material preparation method is shown. An example of a lens base material preparation method is shown. 4 is a schematic cross-sectional view of a lens base material having a collar portion having an inner peripheral surface end portion formed upward with respect to a horizontal plane over the entire peripheral edge portion of the surface to be coated. These are explanatory drawings of the angle which the edge part inner peripheral surface edge part makes with a horizontal surface.

The present invention relates to a method of manufacturing a spectacle lens having a coating film on a lens surface, which includes applying a coating liquid on a surface to be coated of a lens substrate by a spin coating method. In the spectacle lens manufacturing method of the present invention, the coated surface is formed by forming a lens effective surface and a flange surface surrounding the effective surface as a continuous surface, and the flange surface is removed after the application. Thereby, in the spectacle lens to be manufactured, it is possible to prevent a band-like portion from being formed at the peripheral edge portion of the lens effective surface and thereby reducing the uniformity of the film thickness.
Hereinafter, the manufacturing method of the spectacle lens of the present invention will be described in more detail.

  As described above, in the method for manufacturing a spectacle lens of the present invention, the coated surface of the lens base material to which the coating liquid is applied is formed by forming the lens effective surface and the flange surface surrounding the effective surface as a continuous surface. . An example of such a lens substrate is shown in FIG. FIG. 1 is a side view of the lens substrate 1 and an upper view thereof is a top view. Here, the lens effective surface 110 in the coated surface 11 refers to a surface that becomes a portion existing in the spectacle lens manufactured by the manufacturing method of the present invention. By providing the flange surface 111 outside the lens effective surface 110, it is possible to generate a liquid pool on the flange surface, and therefore it is possible to prevent the liquid pool from being generated on the lens effective surface. The lens effective surface and the flange surface are formed as a continuous surface. Here, the continuous surface is a curved surface having no corners, a flat surface, or a combination thereof, and means a smoothly continuous surface. When the lens effective surface and the flange surface are not continuous surfaces, a liquid pool is generated at the boundary between the lens effective surface and the flange surface, and it is difficult to prevent the liquid pool from being generated on the lens effective surface. . Therefore, in the present invention, the lens effective surface and the flange surface are formed as a continuous surface. The surface shape of the surface to be coated can be any shape such as a flat surface, a convex surface, or a concave surface. Since the coating liquid applied on the convex surface tends to spread toward the peripheral edge as compared with a flat surface or on the concave surface, and the liquid pool tends to occur particularly easily, the present invention capable of reducing the liquid pool is a convex surface. It is particularly suitable for application to an embodiment in which a coating film is formed on the surface to be coated.

  The material which comprises a lens base material is not specifically limited, The plastic, inorganic glass, etc. which are used for a normal lens base material can be used. Although the thickness of a lens base material is not specifically limited, Usually, it is about 1-30 mm. The diameter of the lens effective surface is, for example, about 50 mm to 100 mm. For the flange surface that surrounds the lens effective surface, if the flange surface width is equal to or greater than the liquid pool width, it is possible to prevent liquid pooling from occurring on the lens effective surface. The width of the flange surface may be determined after measuring the width of the liquid pool generated at the peripheral edge of the coated surface under the coating liquid and spin coating conditions. In consideration of the formation conditions (prescription of coating liquid, spin coating conditions) of a functional film provided on a general spectacle lens, the width of the flange surface is preferably about 1 to 10 mm. Also, as will be described later, by providing a flange on the entire circumference of the flange surface, the liquid pool width can be reduced. In this case, the width of the flange surface is reduced compared to the case without the flange. In addition, it is possible to suppress or prevent the occurrence of liquid pool on the lens effective surface.

  For example, as shown in FIG. 2, a lens base material having a coated surface is formed by using a cylindrical molded body molded by a known molding method such as casting polymerization or injection molding, as a part of the outer periphery. The method of removing by cutting etc. can be mentioned, leaving Alternatively, in a molding process such as casting polymerization or injection molding, a lens base having the above-described coated surface can be obtained by using a mold designed to form a desired molded surface. . As an example, as shown in FIG. 3, the lens base material having the shape shown in FIG. 3 is formed by forming a notch over the entire circumference on the upper mold (convex surface mold) side of the inner peripheral surface of the gasket used for casting polymerization. Can be obtained.

  Furthermore, by providing a collar portion whose inner peripheral surface end is formed horizontally or upward with respect to the horizontal surface over the entire periphery of the peripheral edge portion of the flange surface, the liquid pool can be reduced more effectively. Therefore, even if the flange surface is made smaller than in the case where there is no such flange portion, liquid accumulation on the lens effective surface can be suppressed or prevented. This is because when the collar portion having the above-described configuration is provided, the collar portion serves as a starting point at which the coating liquid blows off from the surface to be coated, so that the liquid pool width generated at the peripheral edge of the surface to be coated can be reduced. The inventor speculates. However, as a result of the study of the present inventor, if the flange portion is formed at the peripheral edge portion of the coated surface with the inner peripheral surface edge portion facing downward from the horizontal surface, the presence of the flange portion causes It has been found that the liquid pool width generated at the periphery of the coated surface cannot be reduced. The inventor presumes that this is because the corner portion at the boundary between the surface to be coated and the inner peripheral surface of the buttock prevents the coating liquid from blowing off the surface to be coated.

FIG. 4 is a side view illustrating an example of a lens base material having the flange portion. The upper part of FIG. 4 is a schematic cross-sectional view of a lens base material having a collar part in which the inner peripheral surface end is formed upward with respect to the horizontal surface over the entire periphery at the peripheral end of the coated surface. The lower diagram of FIG. 4 is an explanatory view of the angle formed by the end portion of the inner peripheral surface of the buttock and the horizontal plane, and shows only the lens substrate and the inner peripheral surface of the buttock for the sake of simplicity.
The lens base material 1 shown in the upper diagram of FIG. 4 is formed with a flange 2 in which the end 22 of the inner peripheral surface 21 is formed upward with respect to the horizontal plane over the entire circumference of the peripheral edge of the surface 11 to be coated. . The end portion of the inner peripheral surface of the heel portion is formed horizontally or upward with respect to the horizontal plane. The angle θ between the solid line indicating the horizontal plane and the end portion of the inner peripheral surface of the heel portion shown in the lower diagram of FIG. In other words, in the embodiment shown in FIG. 4, the end portion of the inner peripheral surface of the buttock is formed at an angle of about 120 ° with the horizontal plane. It has been found by the inventor's examination that in the ridge where θ exceeds 180 °, the liquid pool width generated in the peripheral portion of the surface to be coated cannot be reduced due to the presence of the ridge. As described above, this is presumed that the corner portion at the boundary between the coated surface and the inner peripheral surface of the buttock prevents the coating liquid from being blown out of the coated surface. However, even in this case, according to the present invention, due to the presence of the flange surface surrounding the lens effective surface, it is possible to suppress or prevent the occurrence of liquid pool on the lens effective surface as compared with the conventional spin coating method.

  The angle θ between the edge of the inner peripheral surface of the collar and the horizontal surface is determined in consideration of the viscosity of the coating liquid used and the spin coating conditions (rotation speed, rotation time, etc.). What is necessary is just to determine the angle which can be blown off from the lens as a starting point. In addition, it is preferable that the width of the inner peripheral surface of the buttock is short in order to reduce the amount of the coating liquid that returns to the surface to be coated without overcoming the buttock. There are concerns that it will be difficult to obtain. The size of the buttock and the angle θ can be determined by performing a preliminary experiment as necessary in consideration of the above points. Taking into account the materials used for the production of ordinary spectacle lenses and the spin coating conditions, the angle θ must be 50 ° or more, more preferably 60 ° or more, and particularly 90 ° or more. This is preferable for reducing the amount of the coating liquid that returns to the coated surface. About the width | variety of a collar part internal peripheral surface, it is preferable that it is the range of 1-5 mm from a viewpoint of a liquid pool prevention thru | or reduction, and it is more preferable that it is the range of 1-3 mm.

In one aspect, the collar portion having the above-described configuration is formed integrally with the surface to be coated, and as another aspect, it is formed as a separate member from the surface to be coated.
The former part of the collar part is molded integrally with the lens base material by using a mold designed to form a desired collar part in a lens base material molding process such as casting polymerization and injection molding. can do. In casting polymerization, a raw material monomer is polymerized in a cavity formed by closing a gap between a pair of opposed molds with a tape or gasket, and a lens substrate having a desired shape can be obtained. Alternatively, the monomer may enter a gap with the inner peripheral surface of the gasket, and burrs may be formed at the peripheral edge of the lens substrate surface. Conventionally, the coating film was formed after the burrs were removed by cutting or the like. However, if the burrs can be the collar part of the above configuration, it can be used as it is without removing it. It is.
On the other hand, the flange portion of the latter mode is, for example, a belt-shaped resin member is wound around the lens substrate peripheral edge at a desired angle so that the inner peripheral surface end is horizontal or upward with respect to the horizontal plane. Can be formed. Although the material which comprises a resin-made member is not specifically limited, Fluorine-type resin, such as Teflon (trademark), is preferable from a viewpoint of liquid pool reduction.
In addition, according to the above-mentioned collar part, it can also prevent that the coating liquid blown off from the to-be-coated surface adheres to the edge surface of a lens base material. In the case where the lens is transported while holding the edge surface after application by spin coating, there is a concern that the transport device is contaminated by the coating liquid if a large amount of coating liquid adheres to the edge surface. Therefore, it is advantageous from the viewpoint of reducing contamination of the conveying device that the coating liquid can be prevented from adhering to the edge surface by the collar portion.

  Application | coating of the coating liquid on the to-be-coated surface of the said lens base material can be performed by normal spin coat. For details thereof, for example, JP-A-2009-285978 and JP-A-2005-246265 can be referred to. Spin coating includes a method of applying from the center of the surface to be applied toward the outer edge, and a method of applying from the outer edge to the center of the surface. Any method may be employed in the present invention, but it may be difficult to spread the high-viscosity coating liquid uniformly over the entire surface to be coated by centrifugal force in the former method. In such a case, it is preferable to employ the latter method, and it is more preferable to perform application so as to draw a spiral application locus from the outer edge of the surface to be applied toward the center. For such a coating method, reference can be made to paragraphs [0012] to [0029] of JP-A-2009-285978 and paragraph [0042] of JP-A-2005-246265. The coating liquid may be applied directly on the application surface of the lens substrate, or the coating liquid may be applied indirectly via another coating film. In this case, the other coating film may be formed by a spin coating method, or may be formed by another method such as a dip coating method, a spray method, or a vapor deposition method.

  After coating the coating liquid on the surface to be coated, a coating film can be formed by applying a curing process (heating, light irradiation, etc.) according to the drying process or the type of curable component contained in the coating liquid. . The coating film formed on the lens substrate is not limited to one layer, and may be two layers or three or more layers. In an embodiment in which a plurality of coating films are formed, it is not essential to form all the coating films by a spin coating method. As described above, the coating film can be formed by other methods such as a dip coating method, a spray method, and a vapor deposition method. Further, the flange surface and the flange may be left until the entire coating film is formed, and after the formation of the coating film that is particularly concerned about the occurrence of liquid pool, the flange surface and the flange are removed. Also good. The flange portion integrally formed with the flange surface and the surface to be coated can be easily removed by a known method such as cutting. What is necessary is just to remove the said member from the collar part currently formed as a to-be-coated surface.

As the coating film formed by the method described above, various functional films that can be formed on spectacle lenses, specifically, photochromic films, polarizing films, hard coat films, antireflection films, water repellent films, etc. A primer (adhesive layer) for enhancing the adhesion between the lens substrate and the functional film or the functional film can be mentioned. In particular, since the photochromic film is often formed into a thick film using a coating solution having a relatively high viscosity, a severe liquid pool is likely to occur. On the other hand, as described above, according to the present invention, the influence of the liquid pool can be reduced or prevented. Therefore, the method for manufacturing a spectacle lens of the present invention is a spectacle lens having a photochromic film, that is, a photochromic lens. It is suitable as a manufacturing method.
Hereinafter, the photochromic film will be described in more detail.

  A coating liquid (photochromic liquid) for forming a photochromic film contains a photochromic dye and a curable component, and is cured by applying a curing treatment after coating to include a photochromic dye in a cured body (resin component). A film can be formed. More specifically, the photochromic liquid can be formed from a curable component, a photochromic dye, a polymerization initiator, and an additive that is optionally added. Below, each component is demonstrated.

(I) Curable component The curable component that can be used for photochromic film formation is not particularly limited, and radical polymerization such as (meth) acryloyl group, (meth) acryloyloxy group, vinyl group, allyl group, styryl group, etc. Known photopolymerizable monomers and oligomers having a functional group, and prepolymers thereof can be used. Among these, a compound having a (meth) acryloyl group or a (meth) acryloyloxy group as a radically polymerizable group is preferable because of easy availability and curability. That is, the resin component contained in the photochromic layer is preferably a resin (acrylic resin) formed by a polymerization reaction of an acrylic monomer. The (meth) acryloyl refers to both acryloyl and methacryloyl, and (meth) acryloyloxy refers to both acryloyloxy and methacryloyloxy. For details of the curable components that can be used in the present invention, reference can be made, for example, to paragraphs [0050] to [0075] of WO2008 / 001578A1.

(Ii) Photochromic dye As the photochromic dye added to the photochromic liquid, known ones can be used, and examples include photochromic compounds such as fulgimide compounds, spirooxazine compounds, and chromene compounds. In the present invention, These photochromic compounds can be used without particular limitation. For details, for example, WO2008 / 001578A1 paragraphs [0076] to [0088] can be referred to. The concentration of the photochromic dye in the photochromic liquid is preferably 0.01 to 20 parts by mass, and more preferably 0.1 to 10 parts by mass with respect to 100 parts by mass of the curable component.

(Iii) Polymerization initiator The polymerization initiator added to the photochromic liquid can be appropriately selected from known thermal polymerization initiators and photopolymerization initiators according to the polymerization method. For details thereof, WO2008 / 001578A1 paragraphs [0089] to [0090] can be referred to.

(Iv) Additives The photochromic liquid contains surfactants, antioxidants, radical scavengers, ultraviolet rays for the purpose of improving the durability of the photochromic dye, improving the color development speed, improving the fading speed and improving the moldability. You may add additives, such as a stabilizer, a ultraviolet absorber, a mold release agent, an anti-coloring agent, an antistatic agent, a fluorescent dye, a dye, a pigment, a fragrance | flavor, a plasticizer. As these additives, known compounds can be used without any limitation. For details, WO2008 / 001578A1 paragraphs [0092] to [0097] can be referred to.

  A cured film (photochromic film) containing a photochromic dye is applied on the lens substrate by applying a photochromic liquid containing the components described above onto the surface to be coated and then applying a curing treatment according to the type of curable component contained. Can be formed. The method for preparing the photochromic liquid is not particularly limited, and can be performed by weighing and mixing a predetermined amount of each component. The order of addition of each component is not particularly limited, and all the components may be added simultaneously, or only the monomer component is mixed in advance, and a photochromic dye or other additive may be added and mixed immediately before polymerization. Good. The photochromic liquid preferably has a viscosity at 25 ° C. of 20 to 500 mPa · s, more preferably 50 to 300 mPa · s, and particularly preferably 60 to 200 mPa · s. By setting this viscosity range, a photochromic film having a desired thickness can be easily obtained. On the other hand, when trying to form a photochromic film by applying a photochromic liquid of this viscosity on the surface to be coated without the flange surface, the film thickness of the photochromic film in the product lens becomes non-uniform due to the influence of the liquid pool, It causes quality degradation due to uneven color. On the other hand, according to the present invention, since the influence of the liquid pool can be reduced, it is possible to obtain a photochromic film in which the influence of the liquid pool is reduced using the photochromic liquid having the above viscosity. The thickness of the photochromic film to be formed is preferably 10 μm or more, more preferably 20 to 60 μm, from the viewpoint of satisfactorily expressing photochromic properties.

  The spectacle lens manufactured according to the present invention may be a finish lens (lens blank optically finished on both sides) or a semi-finished lens (lens blank optically finished on only one surface). May be. The semi-finished lens has an optically finished surface, and the back surface is polished so as to have a desired lens power according to the lens prescription value. The spectacle lens whose both surfaces are optically finished is edged into a frame shape of the spectacle frame at the spectacle store or by a manufacturer who has received an order from the spectacle store, and then beveled. By fitting the beveled lens into the spectacle frame, the spectacles are completed.

  In the following, the present invention will be further illustrated by examples. However, this invention is not limited to the aspect shown in the Example.

1. Production of lens substrate Plastic lens substrate (diameter of effective surface of convex lens: 70 mm, base curve: 2.00) made of polyurethane urea resin (trade name Phoenix, manufactured by HOYA Corporation) was prepared by a casting polymerization method. .
As shown in FIG. 3, a flange surface (width: 5 mm) surrounding the lens effective surface is formed by forming a notch over the entire circumference of the upper mold (convex surface mold) side of the inner peripheral surface of the gasket used for casting polymerization. A lens base material having a convex surface in which the lens effective surface is formed as a continuous surface was obtained. However, since the raw material monomer was polymerized between the upper mold side surface and the gasket inner peripheral surface, the peripheral edge of the convex surface was released when the mold was released. The burr was formed all around. The burr had an inner peripheral surface width of 1 mm and an angle with the horizontal plane of about 90 °. In Example 1, the application process described later was performed after removing the burr by cutting, and in Example 2, the application process described later was performed without removing the burr.
In Example 3, a commercially available Teflon (registered trademark) tape is wound around and fixed to the convex peripheral edge of the lens substrate similar to Example 1, so that the angle between the end of the inner peripheral surface and the horizontal surface is 1 mm wide. After forming the 200 ° collar, a coating process described later was performed.
In Comparative Example 1, a lens base material having neither the flange surface nor burrs was obtained using a normal gasket, and the lens base material was subjected to an application process described later.
In Comparative Example 2, the lens substrate obtained by the same method as in Example 1 except that an upper mold having a different shape of the surface disposed in the cavity was used was subjected to the coating process described later. Since the upper mold used in Comparative Example 2 had a shape in which the peripheral edge (width 5 mm) was bent toward the inside of the cavity, the obtained lens base material had a flange surface (width) outside the lens effective surface. The flange surface was bent downward by about 5 ° with respect to the continuous surface of the lens effective surface. Therefore, there is a corner at the boundary between the lens effective surface and the flange surface.

2. Preparation of photochromic liquid 20 parts by mass of trimethylolpropane trimethacrylate, 35 parts by mass of BPE oligomer (2,2-bis (4-methacryloyloxypolyethoxyphenyl) propane), 10 parts by mass of EB6A (polyester oligomer hexaacrylate) in a plastic container , 100 parts by mass of a radical polymerizable monomer consisting of 10 parts by mass of polyethylene glycol diacrylate having a mass average molecular weight of 532 and 10 parts by mass of glycidyl methacrylate, 3 parts by mass of chromene 1 as a photochromic dye, and a light stabilizer LS765 (bis (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate, methyl (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate) each 5 parts by mass, hindered phenol oxidation Inhibitor Γ-methacryloyloxypropyltrimethoxysilane was added to a composition obtained by adding 5 parts by mass of Irganox 245 (manufactured by BASF) and 0.8 parts by mass of CGI-1870 (manufactured by BASF) as an ultraviolet polymerization initiator and thoroughly mixing them. (Shin-Etsu Chemical Co., Ltd. KBM503) was added dropwise with stirring. Thereafter, a silicone leveling agent Y-7006 (polyoxyalkylene / dimethylpolysiloxane copolymer, manufactured by Toray Dow Corning Co., Ltd.) was further added and mixed in an amount of 0.1 part by mass, and then a rotation and revolution type stirring deaerator (Co., Ltd.) A curable composition having photochromic properties was obtained by defoaming for 2 minutes using Sinky AR-250). The viscosity of the obtained liquid at 25 ° C. was 110 mPa · s.

3. Step of applying photochromic liquid by spin coating method and curing treatment Using the coating apparatus having the configuration described in FIGS. 1 to 9 of JP-A-2005-246265, the above-described 1. 2. In order to draw a spiral application locus from the outer edge of the convex surface (surface to be applied) of the plastic lens base material prepared in the above to the center. The photochromic solution prepared in (1) was applied (number of rotations: 320 rpm, rotation time: 10 seconds, atmospheric temperature during application: about 25 ° C.). However, the spatula mechanism described in JP-A-2005-246265 was not used.
The lens after the application was irradiated with ultraviolet light having a wavelength of 365 nm with a UV lamp in a nitrogen atmosphere.
Through the above steps, a photochromic film having a thickness of about 50 μm was formed on the convex surface of the plastic lens substrate.

4). 2. Confirmation of liquid pool width on coated surface After the treatment, the photochromic film formed on the convex surface of the plastic lens base material is visually observed under a fluorescent lamp for each of the lenses of Examples 1 and 2 and Comparative Examples 1 and 2, and is observed in a band shape at the periphery. The width of the part was measured as the liquid pool width. For Example 3, the above observation and measurement were performed after removing the tape. The results are shown in Table 1.

As shown in Table 1, in Comparative Example 1, since a lens base material without a flange surface was used, the liquid pool width on the lens effective surface was 5 to 6 mm.
On the other hand, in Examples 1 and 3, the liquid pool width on the convex surface of the lens base material was the same as that in Comparative Example 1, but most of the liquid pool was formed on the flange surface. The pool width was less than 1 mm. In Example 3, the flange is provided over the entire circumference of the convex peripheral edge of the lens base material. However, the liquid pool widths of Example 1 and Example 3 are the same, and the liquid pool reducing effect by the flange is seen. There wasn't. This is presumably because the end of the inner peripheral surface of the buttock was downward with respect to the horizontal plane.
In Example 2, it is considered that the liquid pool width is reduced as compared with Examples 1 and 3 due to the effect of the collar.
In Comparative Example 2, the coating liquid was confirmed to adhere to the outer flange surface of the lens effective surface, but a liquid reservoir having a width of 5 to 6 mm was formed on the lens effective surface as in Comparative Example 1. This is because the lens effective surface and the flange surface were not continuous surfaces, so that a liquid pool occurred at the boundary between the lens effective surface and the flange surface, and it was not possible to prevent the occurrence of a liquid pool on the lens effective surface. It is thought that it was because of.
From the above results, it was shown that according to the present invention, it is possible to suppress the occurrence of liquid pooling at the periphery of the surface to be coated in the coating process by the spin coating method.
By removing the flange surface from the lens obtained in Examples 1 and 3 by cutting, and removing the flange surface and the flange from the lens obtained in Example 2 to obtain a uniform film thickness. An eyeglass lens (photochromic lens) having a photochromic film could be obtained.

  According to the present invention, it is possible to provide a spectacle lens having a coating film having a uniform film thickness.

Claims (4)

A method for producing a spectacle lens having a coating film on a lens surface, which comprises applying a coating liquid on a surface to be coated of a lens substrate by a spin coating method,
The coated surface is formed by forming a lens effective surface and a flange surface surrounding the effective surface as a continuous surface,
The method for manufacturing the spectacle lens, wherein the flange surface is removed after the application. The method for manufacturing a spectacle lens according to claim 1, wherein the coating liquid is a photochromic liquid containing a photochromic dye. The spectacle lens manufacturing method according to claim 1, wherein the surface to be coated has a convex shape. The lens base material according to any one of claims 1 to 3, wherein a flange portion having an inner peripheral surface end portion formed horizontally or upward with respect to a horizontal plane is provided over the entire periphery of the peripheral end portion of the flange surface. 2. A method for manufacturing a spectacle lens according to item 1.

Images