JP2013254161A - Spectacle lens and method of processing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spectacle lens that avoids an axis deviation of a lens in a lens grinding process and prevents a printing mark from being left upon removing a layout mark after the lens grinding process.SOLUTION: A spectacle lens 1 having a functionality coating film 4 provided on a top layer of a lens base material 2 comprises: a protection film 5 that covers a surface of the functionality coating film 4 and is to be removed from the surface of the functionality coating film 4 after a lens grinding process; and a layout mark 6 that is printed on a surface of the protection film 5. Thus, the protection film 6 covering the surface of the functionality coating film 4 allows an axis deviation to be avoided. Further, printing the layout mark 6 on the surface of the protection film 5 allows the layout mark 6 to be removed from the surface of the functionality coating film 4 together with the protection film 5 after the lens grinding process. Therefore, there is no possibility that a printing trace of the layout mark 6 is left on the surface of the functionality coating film 4.

Description

  The present invention relates to a spectacle lens and a processing method thereof.

  For example, as a spectacle lens having a vision correction function such as myopia, hyperopia, astigmatism, and presbyopia, there are a single focus lens, a multifocal lens, and a progressive focus lens. Among these lenses, a progressive focus lens not only provides different power fields with a single lens, but also has no boundaries like a multifocal lens. .

Here, an example of a spectacle lens using a progressive focus lens is shown in FIG.
The solid line shown in FIG. 3 represents the shape of the spectacle lens 100a after the progressive focus lens 100 is glazed so as to match the shape of the spectacle frame (frame), and the two-dot chain line shown in FIG. , Represents the shape of the progressive focus lens 100 before lashing.

  In the spectacle lens 100a using the progressive focus lens 100, as shown by a broken line in FIG. 3, the distance portion 101 containing the frequency when looking into the distance is arranged at the upper side, and the frequency when looking near is shown. The near portion 102 that has entered is disposed below, and an intermediate portion 103 in which the frequency changes continuously between the distance portion 101 and the near portion 102 is disposed.

Further, FIG. 4 shows a state of the progressive focus lens 100 before the lashing process.
For example, the geometrical center mark a, the horizontal reference line mark b, the far eye point mark c, the far reference circle mark c ′, and the near reference are provided on the object side surface (referred to as an outer surface) of the progressive focus lens 100. A layout mark including a circle mark d and a left and right display mark e is formed. On the other hand, a hidden mark including a reproduction mark f, an addition mark g, and a manufacturer mark h is formed on the outer surface or the eyeball side surface (referred to as the inner surface) of the progressive focus lens 100, for example.

  Among these, the layout mark clearly indicates the position where the power is measured by the lens meter, and clearly indicates the reference position for the frame processing into the spectacle frame. This layout mark is printed on the lens surface using an ink or the like that can be removed by a solvent such as alcohol, and disappears after the balling process (see, for example, Patent Documents 1 to 3).

  On the other hand, the hidden mark is a unique identification mark corresponding to the type of the lens, and is stamped on the lens surface so as not to disappear after the balling process. It should be noted that the hidden mark is of a level that can be confirmed by reflecting light so as not to be an obstacle when wearing glasses.

  In general, a lens for eyeglasses is formed by processing a lens (lens to be processed) having a circular shape in a plan view so as to match the shape of a spectacle frame selected by a customer in a retail store or the like (referred to as a lashing process). The lens is fitted into a spectacle frame (referred to as a frame case) and delivered to the customer. Note that the lashing process is not limited to a retail store or the like but may be performed at a manufacturer's factory or the like.

Here, a general lashing method using the lashing machine 200 shown in FIG. 5 will be described.
The lashing processing machine 200 shown in FIG. 5 performs the outer shape processing of the lens L to be processed in accordance with the shape of the spectacle frame, and is also called an edger or an outer edge processing machine.

  Specifically, the lashing machine 200 includes a lens lock cap 201 to which the lens L to be processed is fixed, and a pair of lens processing shafts 202 and 203 that can rotate around the axis with the lens L to be processed interposed therebetween. And a grindstone 204 for grinding the outer edge of the lens L to be processed.

  In the balling process using the balling machine 200, first, one surface (convex surface) of the lens L to be processed is fixed to the surface 201a of the lens lock cap 201 via the double-sided adhesive tape 205.

  Next, after attaching the lens lock cap 201 to which the lens L to be processed is fixed to the tip of one lens processing shaft 202, the tip of the other lens processing shaft 203 is connected to the other surface (concave surface) of the lens L to be processed. The lens L to be processed is supported while being sandwiched between the pair of lens processing shafts 202 and 203.

  Next, while pressing the rotating grindstone 204 against the outer edge portion of the lens L to be processed, the outer edge portion of the lens L to be processed is ground and the grindstone 204 is moved while rotating the pair of lens processing shafts 202 and 203. Thus, the outer shape of the lens L to be processed is processed according to the shape of the spectacle frame.

JP-A-1-102517 Japanese Utility Model Publication No. 3-89417 JP-A-6-347615

  By the way, among lenses for eyeglasses sold in recent years, there are lenses in which an oil-repellent coating film is coated on the surface of the lens. The lens coated with this oil-repellent coating film is well received by wearers because dirt hardly adheres to the surface.

  However, in the spectacle lens coated with such an oil-repellent coating film, since the frictional resistance of the surface is small, the object to be processed during the stabbing process using the stabbing machine 200 shown in FIG. In some cases, the lens L and the double-sided adhesive tape 205 slip on the bonding surface, and the lens L to be processed causes an axial shift with respect to the lens processing shafts 202 and 203. When such an axial shift (slip) of the lens L to be processed occurs, the lens L to be processed cannot be accurately processed in accordance with the shape of the spectacle frame.

  Also, in the case of spectacle lenses coated with an oil-repellent coat film, when the layout mark described above is printed, the adhesion between the oil-repellent coat film and the ink is weak, so the ink is repelled and the layout mark is printed. It could be difficult to do. Even if the layout mark can be printed on the lens, there arises a problem that, for example, the layout mark peels off while the lens is packed in a bag and transported.

  For this reason, conventionally, it has been necessary to select an ink having good adhesion to the oil-repellent coat film so that the printed layout mark is not easily peeled off from the surface of the oil-repellent coat film. However, when an ink having good adhesion to the oil-repellent coat film is used, a new problem has arisen in that a print mark remains in a portion where the layout mark is removed after the above-described balling process. Although this print mark cannot be easily confirmed in a normal state, it is such that it appears to float when the surface of the lens is clouded with water vapor.

  Therefore, there is a trade-off relationship between improving the adhesion of the ink to the oil-repellent coat film and keeping no print marks on the portion of the oil-repellent coat film from which the ink has been removed. It was very difficult.

  The present invention has been proposed in view of such a conventional situation, and prevents the lens from being misaligned at the time of stabbing, and does not leave a print mark when the layout mark is removed after stabbing. It is an object of the present invention to provide a spectacle lens and a processing method thereof.

  According to the aspect of the present invention, the lens for spectacles is provided with a functional coat film on the uppermost layer of the lens substrate, and covers the surface of the functional coat film, and the surface of the functional coat film after the balling process. There is provided a spectacle lens characterized by having a protective film removed from the surface and a layout mark printed on the surface of the protective film.

  Further, according to the aspect of the present invention, using a stabbing machine, a process of processing the spectacle lens according to the shape of the spectacle frame, and removing the protective film together with the layout mark from the surface of the functional coat film A method for processing a spectacle lens including the step of:

  According to the aspect of the present invention, it is possible to prevent the lens from being displaced at the time of lashing by the protective film that covers the surface of the functional coat film. Also, by printing the layout mark on the surface of the protective film, the layout mark is removed from the surface of the functional coat film together with the protective film after the balling process. For this reason, the print mark of the layout mark does not remain on the surface of the functional coat film. Further, when the layout mark is printed on the surface of the protective film, an ink having good adhesion to the protective film can be selected, so that the layout mark printed on the surface of the protective film is peeled off before the lashing process. Can be prevented.

It is sectional drawing which shows schematic structure of the lens for spectacles which concerns on one Embodiment of this invention. It is a schematic diagram for demonstrating the glazing process of the lens for eyeglasses shown in FIG. It is a top view which shows an example of the lens for spectacles using a progressive focus lens. It is a top view which shows the state before the conical processing of the progressive focus lens shown in FIG. It is a schematic diagram which shows an example of a lashing machine.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Note that the drawings used in the following description may schematically show the features for convenience in order to make the features easy to understand, and the dimensional ratios of the respective components are the same as the actual ones. Is not limited.

FIG. 1 is a cross-sectional view showing a schematic configuration of a spectacle lens 1 according to an embodiment of the present invention.
As shown in FIG. 1, the spectacle lens 1 has a lens base 2 that has a circular shape in a plan view, and both surfaces 2a and 2b of the lens base 2 have an antireflection film 3 and a repellent layer, respectively. The oil-based coating film 4 is sequentially laminated.

  The lens substrate 2 has two lens surfaces (refractive surfaces) 2 a and 2 b that determine the lens characteristics of the spectacle lens 1. In addition, the lens base 2 constitutes a progressive focus lens, and although not shown in the drawing, as in the progressive focus lens 100 shown in FIGS. , And a near portion containing a near power, and an intermediate portion in which refractive power changes progressively according to the addition power between the distance portion and the near portion. In the lens base 2, the two refractive surfaces 2a and 2b are adjusted in accordance with lens data (for example, spherical power, astigmatism power, addition power, etc.) prescribed for each wearer. ing.

  In FIG. 1, of these two refracting surfaces 2a and 2b, the object side surface (referred to as an outer surface) 2a forms a convex surface, and the eyeball side surface (referred to as an inner surface) 2b forms a concave surface. The lens substrate 2 can be manufactured by a conventionally known manufacturing method using a conventionally known optical plastic material for eyeglasses.

  The antireflection film 3 has a function of preventing reflection on the surface of the spectacle lens 1. Accordingly, the spectacle lens 1 coated with the antireflection film 3 has a characteristic of preventing generation of ghost (virtual image) and flickering.

The antireflection film 3 can be formed by a conventionally known method using a conventionally known material. For example, the antireflection film 3 is a multilayer film (referred to as a multi-coat film) in which a low refractive index material such as SiO ₂ and a high refractive index material such as ZrO ₂ or TiO ₂ are alternately stacked. . Further, SiO ₂ is generally used for the uppermost layer of the antireflection film 3.

  The oil repellent coat film 4 is a functional coat film having oil repellency. Accordingly, the spectacle lens 1 coated with the oil-repellent coating film 4 has a characteristic that the surface is hardly contaminated.

The oil repellent coating film 4 can be formed by a conventionally known method using a conventionally known material. In the present embodiment, for example, a fluorine-based oil repellent film is used. The fluorine-based oil repellent film is formed by bonding an organosilicon compound containing an alkyl group substituted with fluorine having a molecular weight of 4000 to 5000 to SiO _{2 of the} antireflection film 3.

  The eyeglass lens 1 of the present invention covers the surface of the oil-repellent coat film 4 and is removed from the surface of the oil-repellent coat film 4 after the balling process, and is printed on the surface of the protective film 5. It has a layout mark 5.

  The protective film 5 has a function of preventing slipping at the time of lashing, and the eyeglass lens 1 coated with the protective film 5 can be glazed using, for example, the lashing machine 200 shown in FIG. Done.

  That is, in the balling process using the balling machine 200, as shown in FIG. 2, first, one surface of the spectacle lens 1 is formed on the adherend surface 201 a of the lens lock cap 201 via the double-sided adhesive tape 205. Specifically, the surface (convex surface) on which the protective film 5 is formed is fixed. (In the spectacle lens 1 shown in FIG. 2, the antireflection film 3 and the oil-repellent coating film 4 are not shown.)

  Next, after attaching the lens lock cap 201 to which the spectacle lens 1 is fixed to the tip of one lens processing shaft 202, the tip of the other lens processing shaft 203 is connected to the other surface (concave surface) of the spectacle lens 1. The eyeglass lens 1 is supported while being sandwiched between the pair of lens processing shafts 202 and 203.

  Next, while pressing the rotating grindstone 204 against the outer edge of the spectacle lens 1, the outer edge of the spectacle lens 1 is ground and the grindstone 204 is moved while rotating the pair of lens processing shafts 202 and 203. Thus, the outer shape of the spectacle lens 1 is processed according to the shape of the spectacle frame.

  In the present invention, by providing the protective film 5 that covers the surface of the oil-repellent coating film 4, slippage occurs on the adhesive surface between the spectacle lens 1 and the double-sided adhesive tape 205, and the spectacle lens 1 has a lens processing axis. It is possible to prevent the shafts 202 and 203 from being displaced.

  Such a protective film 5 has a certain transmittance in addition to the above-described slip prevention function at the time of lashing processing, and can be easily formed after filming and can be easily removed. It is preferable to use one that allows easy printing of the layout mark 6.

  As the protective film 5 that satisfies such conditions, an organic resin film in which inorganic oxide fine particles are dispersed can be suitably used.

  Among these, examples of the organic resin film include acrylic resin, urethane resin, urea resin, melamine resin, polyester resin, polyvinyl acetal resin, cellulose polymer, polyalkylene oxide polymer, polyvinyl acetate polymer, styrene / methacrylic acid. An organic resin such as an acid ester copolymer can be used. In addition, at least one of these can be used alone. Or you may mix and use 2 or more types. Among them, it is particularly preferable to use a polyvinyl acetal resin.

On the other hand, as the inorganic oxide fine particles, for example, any one of Si, Al, Sn, Sb, Ta, Ce, La, Fe, Zn, W, Zr, In, Ti, and Nb, or these What consists of complex oxide containing at least 2 or more types of oxides can be used. In addition, at least one of these can be used alone. Or you may mix and use 2 or more types. Among them, SiO _2, or, it is preferred to use a composite oxide containing SiO _2. The average particle size of the inorganic oxide fine particles is preferably 100 nm or less.

  Moreover, it is preferable that the ratio of the inorganic oxide fine particle contained in an organic resin film is 15 to 60% by mass ratio, More preferably, it is 30 to 60%. When the proportion of the inorganic oxide fine particles is less than 15%, the amount of axial misalignment becomes large and the oil repellent coating film 4 and the protective film are used when the eyeglass lens 1 is subjected to the balling process using the balling machine 200. When the cutting water enters between the lens lock cap 201 and the eyeglass lens 1 is easily detached from the lens lock cap 201, it becomes impossible to deal with a case where secondary processing is required. On the other hand, when the proportion of the inorganic oxide fine particles exceeds 60%, the protective film 5 becomes brittle, and after the protective film 5 is formed on the oil-repellent coat film 4, the protective film 5 is naturally peeled off. There is.

  When forming the protective film 5, for example, a dipping method, a spin coating method, a spray method, a flow coating method, or the like is used. Moreover, after forming a coating film by these methods, the method of drying by natural drying, blowing of hot air, etc. are used. When an ultraviolet curable resin is used for the organic resin film, a method of curing the coating film by irradiating ultraviolet rays after the coating film is formed is used.

  Among these, in the spin coating method, a relatively small apparatus such as a spin coater is generally used to form a protective film on the surface of the oil repellent coating film 4 on the outer surface (convex surface) 2a side of the lens substrate 2. A coating solution is applied to form a coating film.

  Here, the coating liquid needs to stably disperse the inorganic oxide fine particles in the solvent and dissolve the organic resin. For this reason, although it is not necessarily an essential component in terms of preventing the axial displacement at the time of the above-described lashing process, it is further necessary to use a coating solution containing an organosilicon compound or a hydrolyzate thereof. preferable.

  In particular, when the ratio of the inorganic oxide fine particles is increased, the viscosity of the coating liquid is likely to increase with time, and the usable period is also shortened. On the other hand, by adding an organosilicon compound or a hydrolyzate thereof to the coating liquid, it is possible to stabilize the viscosity of the coating liquid and extend the usable period of the coating liquid. .

  Examples of organosilicon compounds include alkoxysilane compounds such as tetramethoxysilane and tetraethoxysilane, alkylalkoxysilane compounds such as methyltrimethoxysilane and ethyltrimethoxysilane, and silane cups having functional groups such as epoxy groups and methacryl groups. A ring agent or the like can be used. In addition, at least one of these can be used alone. Or you may mix and use 2 or more types. Among these, it is particularly preferable to use these hydrolysates.

  The content of the organosilicon compound or the hydrolyzate thereof is preferably 1 to 40% by mass, more preferably 3 to 20% by mass, based on the total solid content contained in the solvent. When the content of the organosilicon compound or the hydrolyzate thereof is less than 1% by mass, the viscosity of the coating liquid is not sufficiently stabilized. On the other hand, when the content of the organosilicon compound or the hydrolyzate thereof exceeds 40% by mass, the content of the organic resin is relatively decreased, the viscosity of the coating liquid is excessively lowered, and the surface of the oil-repellent coating film 4 is reduced. It becomes difficult to apply the coating liquid on the surface.

  The viscosity of the coating liquid is preferably 40 to 200 cps, more preferably 50 to 100 cps. In addition, the viscosity of the coating liquid in this embodiment is a value measured at 25 ° C. using an E-type viscometer. When the viscosity of the coating liquid is less than 40 cps, the coating liquid is repelled on the surface of the oil-repellent coating film 4 when spin coating is performed, and a coating film cannot be formed or is applied to the surface of the oil-repellent coating film 4. A large amount of coating solution is required to form a film. On the other hand, when the viscosity of the coating liquid exceeds 200 cps, the appearance of the obtained protective film 5 is deteriorated.

  As the solvent, for example, alcohols, ketones, ethers, esters and the like can be used as those capable of dissolving the organic resin and stably dispersing the inorganic oxide fine particles. Among them, it is preferable to use lower alcohols such as methanol and ethanol because the drying speed after applying the coating liquid on the surface of the oil-repellent coating film 4 is relatively fast because it is relatively inexpensive.

  However, these lower alcohols alone are likely to cloud the protective film 5 due to the influence of humidity, so it is preferable to use a solvent having a higher boiling point in combination. Examples of the high boiling point solvent include alcohols having 3 or more carbon atoms such as propanol and butanol, ethylene glycol monoalkyl ethers (cellosolves), propylene glycol monoalkyl ethers, and the like.

  Moreover, it is preferable that a coating liquid contains a small amount of surfactant. As the surfactant, for example, a commercially available silicon-based surfactant or fluorine-based surfactant can be used. When the coating liquid contains such a surfactant, the leveling performance of the coating film formed on the surface of the oil repellent coating film 4 is improved.

  Moreover, it is preferable that a coating liquid contains a small amount of water. As a result, the viscosity of the coating liquid is lowered, and the leveling effect by the surfactant can be sufficiently exhibited.

  Further, the coating liquid may contain a dye or a pigment in order to color the protective film 5. Furthermore, the coating liquid may contain a deodorant, a fragrance, or a microencapsulated product in order to reduce the off-flavor generated during the balling process.

  The layout mark 6 is the same as the layout mark formed on the progressive-focus lens 100 shown in FIG. 4, and is printed on the surface of the protective film 5 using, for example, a pad printing method or an ink jet printing method. Yes. For printing the layout mark 6, conventionally known printing inks can be used. That is, the ink has good adhesion to the protective film 5 and the type of dye or pigment, the type and concentration of resin, the type of solvent, the type of surfactant, etc. so that the layout mark 6 is not easily peeled off. What is necessary is just to select and use suitably.

  In particular, when the main component of the protective film 5 is a general-purpose resin such as polyvinyl acetal, the printing performance of the ink is superior to that of the oil-repellent coating film 4, so the selection of the type of ink, the selection of the printing method, etc. Great freedom.

  As described above, in the eyeglass lens 1 of the present invention, the protective film 5 that covers the surface of the oil-repellent coating film 4 can prevent axial misalignment at the time of lashing. As a result, the spectacle lens 1 can be accurately processed according to the shape of the spectacle frame.

  Further, in the spectacle lens 1, the layout mark 6 is printed on the surface of the protective film 5, and therefore the layout mark 6 together with the protective film 5 and the oil-repellent coating film 4 are used using, for example, an adhesive tape after the balling process. It can be easily removed from the surface.

  In this case, the print mark of the layout mark 6 does not remain on the surface of the oil repellent coating film 4. Further, since the layout mark 6 is removed together with the protective film 5, the work of wiping the surface of the spectacle lens 1 with alcohol or the like as in the prior art becomes unnecessary.

  Furthermore, in this spectacle lens 1, when printing the layout mark 6 on the surface of the protective film 5, it is possible to select ink having good adhesion to the protective film 5. It is possible to prevent the layout mark 6 printed on the surface from being peeled off.

In addition, this invention is not necessarily limited to the thing of the said embodiment, A various change can be added in the range which does not deviate from the meaning of this invention.
For example, the spectacle lens 1 has a configuration in which the antireflection film 3 is provided on both surfaces 2 a and 2 b of the lens base 2, but the antireflection film 3 is provided only on one surface of the lens base 2. May be provided. Further, the antireflection film 3 may be omitted.

  Further, the eyeglass lens 1 may have a structure in which a heart coat film having scratch resistance is provided on the surfaces 2a and 2b of the lens base 2 in order to make the lens 1 less likely to be scratched. Furthermore, a configuration may be employed in which a primer coat film is provided between the surfaces 2a and 2b of the lens substrate 2 and the heart coat film to improve mutual adhesion or to impart impact resistance. In addition, various functional films can be laminated on the surfaces 2 a and 2 b of the lens substrate 2.

  Further, as the protective film 5, in addition to those described above, for example, those disclosed in International Publication No. 2006/093113 can be used. Specifically, (1) a fine particle layer in which at least one of metal oxide fine particles and fluoride fine particles is dispersed is formed on the surface of the oil-repellent coat film, and an organic compound is further formed on the fine particle layer. Or a resin layer made of an organic compound in which at least one of metal oxide fine particles and fluoride fine particles is dispersed on the surface of the oil-repellent coat film. be able to.

  In addition to the oil-repellent coat film 4 described above, the functional coat film provided on the uppermost layer of the lens substrate 2 is, for example, one having water repellency (water-repellent coat film) or hydrophilic. It may be a thing (antifogging film) or the like.

  In addition, the present invention is not limited to the case where the spectacle lens 1 is a progressive focus lens, but for spectacle lenses in which a functional coat film (oil-repellent coat film 4) is provided on the uppermost layer of the lens base 2. Thus, the present invention can be widely applied.

  Hereinafter, the effects of the present invention will be made clearer by examples. In addition, this invention is not limited to a following example, In the range which does not change the summary, it can change suitably and can implement.

[Preparation of coating liquid A for oil-repellent coating film]
In a beaker, 995 g of fluorine-based solvent (trade name: Novec HFE-7200, manufactured by Sumitomo 3M) was taken, and oil repellent (trade name: KY-130 (oil repellent concentration: 20%), manufactured by Shin-Etsu Chemical Co., Ltd.) 5.0 g Was dissolved. The oil repellent concentration of this coating solution was 0.1% by mass.

[Preparation of coating liquid B for oil-repellent coating film]
In a beaker, 995 g of a fluorine-based solvent (trade name: Novec HFE-7200, manufactured by Sumitomo 3M) was taken, and an oil repellent (trade name: OPTOOL AES4-E (oil repellent concentration: 20%), manufactured by Daikin Industries, Ltd.) 5.0 g Was dissolved. The oil repellent concentration of this coating solution was 0.1% by mass.

[Preparation of Coating Liquid C for Protective Film]
Take 1.6 parts by mass of methyltrimethoxysilane (trade name: KBM-13, manufactured by Shin-Etsu Chemical Co., Ltd.) in a beaker, add 5.0 parts by mass of 0.0002N hydrochloric acid aqueous solution and stir for 1 hour to perform hydrolysis. It was.
Next, 21.3 parts by mass of SiO ₂ dispersed methanol sol (trade name: methanol silica sol, solid content 30% by mass, SiO ₂ particle diameter 10 nm to 20 nm, manufactured by Nissan Chemical Industries, Ltd.) was added to the hydrolyzate, The mixture was further stirred for 1 hour.
Next, another beaker is prepared, and polyvinyl butyral resin (34.0 parts by mass of methanol, 20.0 parts by mass of 1-butanol, and 10.0 parts by mass of 1-methoxy-2-propanol are added to a mixed solution. (Product name: ESREC BM-5, manufactured by Sekisui Chemical Co., Ltd.) 8.0 parts by mass was dissolved.
Next, the whole solution of hydrolyzed methyltrimethoxysilane and methanol silica sol was added to the mixed solution and stirred. Further, a silicon surfactant (trade name: L-7001, manufactured by Toray Dow Corning Co., Ltd.) ) 0.1 parts by mass was added and stirred overnight to prepare coating solution C.
It was 92 cps (25 degreeC) when the viscosity of the obtained coating liquid C was measured with the E-type viscosity meter (Brand name: VISCONIC ELD viscometer, the Toki Sangyo company make).

[Preparation of coating liquid D for protective film]
In a beaker, 30.1 parts by mass of methanol and 30.0 parts by mass of 1-butanol were taken, and 9.0 parts by mass of polyvinyl butyral resin (S-REC BM-5) was dissolved.
Next, 14.0 parts by mass of methanol silica sol was added to the mixed solution and stirred.
Furthermore, 5.0 parts by mass of pure water and 0.2 parts by mass of a silicon-based surfactant (L-7001) were added to the mixed solution and stirred overnight to prepare a coating solution D.
The viscosity of the obtained coating liquid D was 120 cps (25 ° C.) when measured with an E-type viscometer (trade name: VISCONIC ELD viscometer, manufactured by Toki Sangyo Co., Ltd.).

"Example 1"
A primer coat film and a hard coat film are formed on the surface of a plastic progressive focus lens having a refractive index of 1.74, and an antireflection film whose outermost layer is SiO ₂ is formed on the surface by vacuum deposition. A film was formed.
Next, the lens with antireflection film is immersed in the coating liquid A for oil-repellent coating film for 10 seconds, and then pulled up at a speed of 8 mm / second, and then placed in a constant temperature and humidity chamber at 50 ° C./80%. The oil-repellent coat film was stabilized for a long time.
The contact angle of water on the surface of the obtained lens with an oil-repellent coat film to water was measured using an automatic contact angle meter (trade name: DM-500, manufactured by Kyowa Interface Science Co., Ltd.) and found to be 109 °.
Thereafter, the lens with the oil-repellent coat film was placed on the spin coater with the convex surface facing upward. Next, while rotating the lens with an oil-repellent coating film at 1000 RPM with a spin coater, about 3 mL of the coating liquid C for the protective film was applied to the center of the convex surface and rotated as it was for 15 seconds. Then, the coating film was dried for 1 hour, and the plastic lens for spectacles in which the protective film was formed in the convex surface was obtained.
Next, the layout mark shown in FIG. 4 was printed on the surface of the protective film by a pad printer. The ink used was lemon yellow (400F 210, manufactured by Seiko Advance) diluted with a dedicated thinner (T-125) (lemon yellow / dedicated thinner = 2/1 mass ratio).

  After preparing two sample lenses of the same level and evaluating the printed appearance of the layout mark, one of them was evaluated for the appearance of the layout mark after the transportation test, and the remaining one was printed with the layout mark. After being left for 3 days, the ball was processed. Then, after the balling process, the protective film was peeled off, and printing marks were confirmed.

(Appearance evaluation of layout mark after printing)
The appearance of the layout mark after printing was evaluated according to the following criteria.
○: The layout mark was free from chipping and was in a good printing state.
Δ: Some chipping was observed in the layout mark.
X: Almost no printing was possible and the layout mark was poor.

(Appearance evaluation of layout mark after transportation)
The lens with protective film on which the layout mark was printed was packaged in a lens bag with inner paper, transported (distance about 300 km), and then the appearance of the layout mark was evaluated according to the following criteria.
○: The layout mark was not peeled off, and a good printing state was maintained.
(Triangle | delta): Some peeling was recognized by the layout mark.
X: Many peeling was recognized by the layout mark and it was unsatisfactory as a layout mark.

(Appearance assessment of layout mark print marks after processing)
The lens with protective film on which the layout mark was printed was left for 3 days, and then framed. Thereafter, the protective film is peeled off using an adhesive tape, the surface is wiped with ethanol, and then taken out after being placed in a constant temperature and humidity chamber at 60 ° C. and 80% for 10 seconds to evaluate the appearance of the printed marks on the layout mark. The following criteria were used.
○: No print marks on the layout mark could be confirmed.
Δ: A print mark can be confirmed, but the outline of the layout mark is unclear.
X: Print marks could be confirmed and the outline of the layout mark was clear.

  Table 1 below shows the appearance evaluation of the layout marks after printing, the appearance evaluation of the layout marks after transportation, and the appearance evaluation of the printed layout mark after processing.

"Example 2"
A primer coat film and a hard coat film are formed on the surface of a plastic progressive focus lens having a refractive index of 1.74, and an antireflection film whose outermost layer is SiO ₂ is formed on the surface by vacuum deposition. A film was formed.
Next, the lens with antireflection film was immersed in the coating liquid B for oil repellent coating film for 10 seconds, and then pulled up at a speed of 8 mm / second, and then placed in a constant temperature and humidity chamber at 50 ° C./80%. The oil-repellent coat film was stabilized for a long time.
The contact angle of water on the surface of the obtained lens with an oil-repellent coated film with respect to water was measured using an automatic contact angle meter (trade name: DM-500, manufactured by Kyowa Interface Science Co., Ltd.) and found to be 116 °.
Thereafter, the lens with the oil-repellent coat film was placed on the spin coater with the convex surface facing upward. Next, while rotating the lens with an oil-repellent coat film at 1000 RPM with a spin coater, about 3 mL of the coating liquid D for protective film was applied to the center of the convex surface and rotated as it was for 15 seconds. Then, the coating film was dried for 1 hour, and the plastic lens for spectacles in which the protective film was formed in the convex surface was obtained.
Next, the layout mark shown in FIG. 4 was printed on the surface of the protective film by a pad printer. As the ink, yellow ink (Y57-66, manufactured by Essilor of America Inc.) was used.

  After preparing two sample lenses of the same level and evaluating the printed appearance of the layout mark, one of them was evaluated for the appearance of the layout mark after the transportation test, and the remaining one was printed with the layout mark. After being left for 3 days, the ball was processed. Then, after the balling process, the protective film was peeled off, and printing marks were confirmed.

  Table 2 below shows the appearance evaluation of the layout marks after printing, the appearance evaluation of the layout marks after transportation, and the appearance evaluation of the printed layout mark after processing.

"Example 3 to Example 6"
For Examples 3 to 6, two protective film-coated lenses each having a layout mark printed thereon were produced by the same procedure as in Examples 1 and 2 above. The oil repellent coating film coating liquid, protective film coating liquid, layout mark printing method, and ink type used in each example are as shown in Table 1 below.

  And about these Examples 3-6, similarly to the said Example 1, 2, the external appearance evaluation of the layout mark after printing, the external appearance evaluation of the layout mark after transport, and the external appearance evaluation of the layout mark printed trace after a process are carried out. went. The evaluation results are shown in Table 1 below.

“Comparative Examples 1 to 4”
About Comparative Examples 1-4, the lens with an oil-repellent coating film was produced by the procedure similar to Example 1,2. However, the layout mark was printed directly on the surface of the oil-repellent coat film. And the protective film was formed on the surface of the oil-repellent coat film on which this layout mark was printed. The oil repellent coating film coating liquid, protective film coating liquid, layout mark printing method, and ink type used in each comparative example are as shown in Table 1 below.

  And about these comparative examples 1-4, the external appearance evaluation of the layout mark after printing, the external appearance evaluation of the layout mark after transport, and the external appearance evaluation of the layout mark printed mark after processing are carried out similarly to the said Examples 1 and 2. went. The evaluation results are shown in Table 1 below.

As shown in Table 1, in Examples 1 to 6, there was no problem with respect to the appearance evaluation of the layout mark after printing, the appearance evaluation of the layout mark after transportation, and the appearance evaluation of the printed layout mark after processing. .
On the other hand, in Comparative Examples 1 to 4, there are problems in any of the appearance evaluation of the layout mark after printing, the appearance evaluation of the layout mark after transportation, and the appearance evaluation of the printed layout mark after processing. It was.

DESCRIPTION OF SYMBOLS 1 ... Eyeglass lens 2 ... Lens base material 3 ... Antireflection film 4 ... Oil-repellent coating film (functional coating film) 5 ... Protective film 6 ... Layout mark 100 ... Progressive focus lens 100a ... Eyeglass lens 101 ... Distance part DESCRIPTION OF SYMBOLS 102 ... Near part 103 ... Intermediate | middle part 200 ... Tapping machine 201 ... Lens lock cap 202, 203 ... Lens processing shaft 204 ... Grinding stone 205 ... Double-sided adhesive tape

Claims (12)

A spectacle lens in which a functional coating film is provided on the uppermost layer of a lens substrate,
Covering the surface of the functional coat film, and a protective film removed from the surface of the functional coat film after the balling process,
A spectacle lens having a layout mark printed on a surface of the protective film. The functional coat film has oil repellency,
The spectacle lens according to claim 1, wherein the protective film has a function of preventing slipping during a balling process. The functional coat film is made of a fluorine-based oil repellent film,
The spectacle lens according to claim 2, wherein the protective film is made of an organic resin film in which inorganic oxide fine particles are dispersed.   The organic resin film is made of acrylic resin, urethane resin, urea resin, melamine resin, polyester resin, polyvinyl acetal resin, cellulose polymer, polyalkylene oxide polymer, polyvinyl acetate polymer, styrene / methacrylate copolymer. 4. The spectacle lens according to claim 3, comprising any one or more of them.   The spectacle lens according to claim 4, wherein the organic resin film includes a polyvinyl acetal resin.   The inorganic oxide fine particles may be any one of Si, Al, Sn, Sb, Ta, Ce, La, Fe, Zn, W, Zr, In, Ti, and Nb, or at least these oxides. The eyeglass lens according to any one of claims 2 to 5, comprising a composite oxide containing two or more kinds. The spectacle lens according to claim 6, wherein the inorganic oxide fine particles are made of SiO ₂ or a composite oxide containing SiO ₂ .   The spectacle lens according to any one of claims 2 to 7, wherein the inorganic oxide fine particles have an average particle size of 100 nm or less.   The spectacle lens according to any one of claims 1 to 8, wherein the layout mark is printed by pad printing or inkjet printing.   The spectacle lens according to any one of claims 1 to 9, wherein an antireflection film is provided on at least one surface side of the lens substrate.   A distance part containing a distance power, a near part containing a near power, and an intermediate part where the refractive power gradually changes according to the addition power between the distance part and the near part. The lens for spectacles as described in any one of Claims 1-10 characterized by the above-mentioned. A step of processing the spectacle lens according to any one of claims 1 to 11 in accordance with the shape of the spectacle frame using a stabbing machine;
Removing the protective film together with the layout mark from the surface of the functional coat film.

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