JPH06324293A - Spectacle lens - Google Patents

Abstract

PURPOSE:To obtain a spectacle lens capable of selectively preventing the transmission of IR, UV and blue light. CONSTITUTION:This spectacle lens has a means for controlling the transmission of IR, contains a UV absorbent such as a benzophenone compd. and a blue light absorbent such as an yellow dye and transmits the visible light in at least 450-750nm wavelength region, and the average light transmittance in 450-750nm is controlled to >=5%. An IR absorbent such as a dithiol-nickel complex can be added as a means for controlling the transmission of IR. The average light transmittance in the 200-400nm wavelength region and that in the 780-950nm wavelength region are controlled to < about 0.3%, the average light transmittance in the 400-440nm wavelength region to < about 3.5% and the average light transmittance in the 450-730nm wavelength region to >= about 10%. A sharp and stereoscopic field is obtained by this spectacle lens, and the eye is not hurt by the harmful light even if the lens is used in the extremely strong sunlight, and a weak-sighted person wears the spectacles.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spectacle lens useful for protecting eyes from harmful rays of sunlight.

[0002]

2. Description of the Related Art Sun rays include rays that are harmful to the eyes. For example, ultraviolet rays having a wavelength of 400 nm or less adversely affect the cornea and the crystalline lens. In particular, if you expose your eyes to the sun's rays for a long time in a place with a lot of ultraviolet rays, such as snowy mountains or the sea,
Prone to keratitis. In addition, the effects on the lens are cumulative, which may cause cataracts.

On the other hand, blue light having a wavelength of 400 to 450 nm is a ray of light that causes glare and causes flicker in the field of view, haze, eye strain, and deterioration of visual acuity. Among infrared rays, especially 750 to 1000
Near-infrared rays having a wavelength of nm reach the fundus of the eye, and when acted strongly, damage the iris, lens, retina, and choroid. The effects of near-infrared rays gradually appear and are cumulative, so that the discovery of inflammation is delayed and the inflammation tends to become chronic.

Therefore, there is a demand for a spectacle lens which restricts the transmission of these harmful rays even in places where the sun's rays are strong, such as high mountains, snow, and beaches. Further, such a spectacle lens that regulates the transmission of harmful rays is also useful for those who need eye protection, such as patients undergoing eye treatment and the elderly.

However, these harmful rays cannot be blocked by ordinary sunglasses that merely protect the eyes from the glare of sunlight. Moreover, if you use such sunglasses,
Since the transmittance of visible light is low, the pupil opens and conversely harmful light is likely to enter the eye.

Therefore, various spectacle lenses which prevent the transmission of the harmful rays have been proposed. For example, Japanese Patent Publication Sho 5
JP-A-3-39910 contains an ultraviolet absorber,
A spectacle lens that regulates the transmission of ultraviolet rays is disclosed. Further, JP-A-3-64730 discloses an eyepiece lens including a coating for removing infrared rays and a coating for removing ultraviolet rays. However, since these lenses transmit blue light having a wavelength of 400 to 450 nm, glare of sunlight cannot be prevented.

On the other hand, Japanese Patent Publication No. 1-501172 discloses a sunglasses lens which blocks the transmission of ultraviolet rays, blue rays and horizontally polarized rays. However, this lens does not prevent damage to the fundus because it transmits near infrared rays.

As described above, since the conventional spectacle lens cannot completely block the harmful rays contained in the sun rays, it can be safely used especially in a place where the sun rays are strong, or used by a person with a weak eyes such as an aged person. It is not suitable enough for.

[0009]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to prevent transmission of harmful rays almost completely and selectively, and to be used safely even in a place where strong sun rays such as high mountains and snowy mountains. It is to provide a spectacle lens useful for protecting the eye.

[0010]

Means for Solving the Problems As a result of intensive studies for achieving the above-mentioned object, the present inventor found a spectacle lens which can be suitably used for a place where the sun rays are extremely strong, a patient after eye surgery, etc. completed.

That is, the present invention comprises a means for controlling the transmission of infrared rays, contains an ultraviolet absorber and a blue light absorber, transmits at least visible light in the wavelength range of 530 to 730 nm, and transmits light in the wavelength range of 450 to 750 nm. An eyeglass lens having an average light transmittance of 5% or more is provided.

The means for controlling the transmission of infrared rays includes means for absorbing infrared rays and means for reflecting infrared rays. In order to absorb infrared rays, for example, the lens may contain an infrared absorbent, and the lens surface may be formed with a coating containing the infrared absorbent.

The infrared absorbing agent absorbs infrared rays, does not impair the light absorbing ability of other absorbing agents, and has a wavelength of 53.
There is no particular limitation as long as it is an absorber that transmits visible light in the range of 0 to 730 nm. Among the infrared absorbers, the near infrared absorber is often used. When a near-infrared absorbing agent is used, near-infrared rays that reach the fundus of the human eye are blocked, so that inflammation of the retina and the like can be prevented.

Examples of near infrared absorbers include cyanine dyes, phthalocyanine dyes, naphthoquinone dyes,
Dithiol complex, bis (1-mercaptolate-2-naphtholate) quaternary ammonium salt, anthraquinone dye, thieno [3,2-b] thienylidenebisbenzoquinones, aminium compound, polymethine compound,
Examples thereof include diimonium compounds, cupric sulfide, and tungsten dyes such as reaction products of tungsten hexachloride and (phosphite) ester. Among these near-infrared absorbers, a dithiol complex, particularly a dithiol nickel complex such as a bis (1,2-diaryl-1,2-ethylenedithiolate) nickel complex is preferably used. The infrared absorbers may be used alone or in combination of two or more.

The means for reflecting infrared rays is, for example, a metal coating formed on the surface of the lens, for example, aluminum,
It can be composed of a deposited film of gold or the like.

When a coating film reflecting infrared rays is formed on the lens, the thickness of the coating film is usually 300 to 5000 nm, preferably 500 to 3000 nm.

In order to regulate the transmission of infrared rays, the use of an infrared absorber may be combined with the formation of a layer that reflects infrared rays.

The ultraviolet absorber has a wavelength of 400n.
Various compounds that absorb light of m or less can be used. Examples of the ultraviolet absorber include benzophenone compounds such as 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-n-octoxybenzophenone, and 4-dodecyloxy-2-hydroxybenzophenone; 2-
(2'-Hydroxy-5'-methylphenyl) benzotriazole, 2- (2'-hydroxy-3'-t-butyl-5'-methylphenyl) -5-chlorobenzotriazole, 2- (2'-hydroxy) Benzotriazole compounds such as -4'-n-octoxyphenyl) benzotriazole; salicylic acid derivatives such as phenyl salicylate, p-t-butylphenyl salicylate, p-octylphenyl salicylate; 2-ethylhexyl 2-
Cyano-3,3-diphenyl acrylate, ethyl 2
Acrylonitrile compounds such as -cyano-3,3-diphenyl acrylate; resorcinol monobenzoate, 2,4-di-t-butylphenyl 3,5-di-t
Examples thereof include benzoic acid derivatives such as -butyl-4-hydroxybenzoate. Among these, preferred ultraviolet absorbers include benzophenone compounds and benzotriazole compounds.

The blue light absorbing agent has a wavelength of 400 to
Compounds that absorb light at 450 nm, such as green dyes,
Examples include yellow dyes, orange dyes and the like, and mixtures thereof.

The type of the dye is not particularly limited, and any one of a direct dye, an acid dye, a basic dye, an acid mordant, a metal complex salt dye, a sulfur dye, a vat dye, a soluble vat dye, an azoic dye, a disperse dye and the like can be used. May be Dyes are often often oil soluble.

Examples of the green dye include Disperse Green 1 and the like. Examples of yellow dyes include Dispers Yellow 3, Dispers Yellow 5, Dispers Yellow 23, Dispers Yellow 54, Dispers Yellow 56, Dispers Yellow 60, Dispers Yellow 64, Solvent Yellow 117, Pigment Yellow 147 and the like. To be For orange dyes, Disperse Orange 3 and Solvent Orange 67
Etc. are included.

Preferred blue light absorbers include yellow dyes, orange dyes, and combined dyes of yellow dyes and orange dyes. Particularly preferred yellow dyes include Disperse Yellow 3, Disperse Yellow 23, Disperse Yellow 54, Solvent Yellow 117 and the like.
Particularly preferred orange dyes include Solvent Orange 67 and the like. The particularly preferable combination of the yellow dye and the orange dye includes, for example, the combination of the particularly preferable yellow dye and the orange dye, the combination of Disperse Yellow 23 and the Disperse Orange 3, and the like.

The infrared absorbing agent, the ultraviolet absorbing agent and the blue light absorbing agent may be added to the raw material of the lens so as to be uniformly contained in the entire lens, or may be contained in the coating film formed on the surface of the lens by coating. Good. Further, the absorbent may stain the surface of the lens. Further, if necessary, the coating film containing the absorbent may be formed as a layer inside the lens.

(1) When the above-mentioned absorber is contained in the lens, the amount of the infrared absorber used is the amount of the material 1 which constitutes the lens.
It is usually 0.01 to 10 parts by weight, preferably 0.03 to 0.5 parts by weight, relative to 00 parts by weight.

The amount of the ultraviolet absorber used is usually 0.01 to 10 parts by weight, preferably 0.03 to 0.5 parts by weight, based on 100 parts by weight of the material constituting the lens.

The amount of the blue light absorbing agent used varies depending on the type of the blue light absorbing agent, but is usually 0.005 to 10 parts by weight, preferably 0.01 to 0, based on 100 parts by weight of the material constituting the lens. It is about 5 parts by weight.

(2) In the case of forming a coating containing an infrared absorbing agent on the lens, the content of the infrared absorbing agent in the coating is, for example, 0.1 to 25% by weight, preferably 0.5 to
It is about 10% by weight.

The content of the ultraviolet absorber in the coating is, for example, 0.1 to 25% by weight, preferably 0.5 to 10% by weight.

The content of the blue light absorber in the coating is
For example, 0.1 to 25% by weight, preferably 0.5 to 10
It is about% by weight.

The coating film can be formed by applying a coating agent containing the absorbent and the transparent polymer. Examples of the transparent polymer include poly (meth) acrylic polymer, polycarbonate, polyester,
Examples are polystyrene and silicone resin.

The thickness of each coating is, for example, 1 to 20 μm.
m, preferably about 3 to 10 μm. The thickness of the entire coating film containing the absorbent is, for example, 2 to 30 μm,
It is preferably about 3 to 20 μm.

The coating film may be composed of a plurality of layers formed by sequentially applying coating agents containing respective absorbers, and a coating agent containing an infrared absorbing agent, an ultraviolet absorbing agent and a blue light absorbing agent may be formed. It may be one coat formed by applying. Further, when the coating film is formed of a plurality of layers, the stacking order of the layers is not particularly limited.

In the present invention, a spectacle lens containing a dithiol complex as an infrared absorber for controlling the transmission of infrared rays, especially a dithiol nickel complex, and a yellow dye and / or an orange dye as a blue light absorber, particularly as an ultraviolet absorber. A spectacle lens containing a benzophenone-based compound or a benzotriazole-based compound can remove the harmful rays extremely selectively and efficiently, and can obtain a sharp and three-dimensional field of view. Therefore, it is suitable for sports, medical, and industrial use. Available.

The spectacle lens of the present invention transmits visible light having a wavelength of at least 530 to 730 nm and has a wavelength of 4
The average transmittance of light in the 50 to 750 nm region should be 5% or more. In the eyeglass lens of the present invention, a wavelength of 200
The average transmittance of light in the range of 400 nm to 780 nm to 780 nm is usually less than 1%, preferably less than 0.5%, and more preferably less than 0.3%. Also, the wavelength 400
The average transmittance of light in the 440 nm region is usually less than 5%,
It is preferably less than 3.5%, more preferably less than 2%. Further, the average transmittance of visible light in the wavelength range of 450 to 730 nm is usually 10% or more, preferably 10 to 90.
%, More preferably 10 to 70%, still more preferably 1
It is about 0 to 40%.

A preferred spectacle lens has a wavelength of 400 to
Average light transmittance (A%) in the 440 nm region and wavelength 450-
Ratio with the average light transmittance (B%) in the 730 nm region (A /
B) includes spectacle lenses where A / B ≦ 0.3, preferably A / B ≦ 0.2. With such a lens,
Since blue light of visible light is extremely selectively removed, a clear view can be obtained without glare.

The spectacle lens of the present invention may be either a glass lens or a plastic lens. Since plastic is lighter in weight than glass and is hard to break and has high safety, plastic lenses are often used.

Examples of the material of the plastic lens include polymers having high light transmittance and being moldable, for example, methacrylic resin such as polymethylmethacrylate; polycarbonate; polydiallylglycolcarbonates such as polydiethyleneglycolbisallylcarbonate; polystyrene and the like. it can. Of these, polycarbonate and the like, which are excellent in transparency and moldability and have high mechanical strength, are preferable.

The spectacle lens of the present invention can be manufactured by a conventional method depending on the material of the lens.

The glass lens can be manufactured by forming a film containing the absorbent on a lens molded into a predetermined shape. When the absorbent is an infrared classifying agent, instead of the coating containing the infrared absorbing agent, a coating that reflects the infrared rays may be formed. The film formation can be performed by a conventional coating method. The coating film may be formed of a plurality of layers containing respective absorbents and the like.

The plastic lens can be manufactured, for example, by the following method. That is, it can be produced by adding the absorbent to the raw material monomer (a) and polymerizing it by a casting method or the like.

The plastic lens can also be manufactured by molding the melt of the polymer (b) and the absorbent using a predetermined mold. in this case,
As the polymer, when not impairing the polymerization reaction,
It is also possible to use a polymer prepared by previously adding one or more kinds of the above-mentioned absorbents and polymerizing them. The melting temperature varies depending on the type of polymer used, but is, for example, 150 to 3
It is about 00 ° C. The molding can be performed, for example, by injection molding. Since this method is extremely simple, it is often used as a method for manufacturing the spectacle lens of the present invention.

Further, the plastic lens can be manufactured by (c) dyeing or coating a lens molded into a predetermined shape. The dyeing can be performed by a conventional method. For example, the washed lens can be dyed by immersing it in a solution in which the absorbent is dissolved or dispersed, and then drying. The solvent used in dyeing is not particularly limited as long as it is an inert solvent for the material forming the absorbent and the lens, but usually, water, an organic solvent such as alcohol, or a mixed solvent thereof is used. To be The dyeing is carried out especially when the blue light absorber is contained in the lens. The coating can also be performed by a conventional method. By coating, a coating that reflects infrared rays or a coating containing the above-mentioned absorber can be formed.

These methods can be used in combination of two or more.

In manufacturing the spectacle lens of the present invention, various additives such as dyes, pigments, antioxidants, stabilizers,
You may add a plasticizer, a polymerization regulator, a peeling agent, etc.

When the spectacle lens of the present invention is a plastic lens, the lens surface may be reinforced coated to increase its surface hardness. As a strengthening coat for the lens surface, an inorganic strengthening coat that deposits special glass on the surface of the lens by a vacuum deposition method, and a coating of silicon resin etc. is formed on the lens surface by immersing the lens in a solution containing a silicon-based compound, etc. Organic strengthening coat (hard coat)
Is mentioned. In the spectacle lens of the present invention, it is particularly preferable that a hard coat is applied.

The spectacle lens of the present invention may be provided with an anti-fog coating in order to prevent the lens surface from becoming fogged due to sweating or breathing. Anti-fog coating is a conventional method,
For example, it can be performed by dipping the lens in a solution containing an antifogging agent.

Further, the spectacle lens of the present invention may be dyed with a dyeing agent other than the blue light absorbing agent. It is possible to give various colors by dyeing to enhance fashionability and reduce glare of sunlight.

Furthermore, the spectacle lens of the present invention may be subjected to surface treatment or treatment such as antireflection treatment, chemical resistance treatment and antistatic treatment. Further, by adding a degree to the spectacle lens, it can be used as a myopic lens or a presbyopia lens. By using the spectacle lens of the present invention as a presbyopia lens, it can be suitably used as protective glasses for aged with weak eyesight.

The spectacle lens of the present invention selectively blocks the transmission of infrared rays, ultraviolet rays and blue light, which are harmful to the human eye, so that it does not cause any strain or damage to the eyes, and it is possible to clear, cloudy, rain, snow,
A sharp and three-dimensional view can be obtained regardless of the weather such as fog. Therefore, it can be widely used for sports, medical treatment, and industrial use, but especially to protect the eyes in snowy mountains, beaches, space, etc. where the sun is strong, and also for the eyes and the eyes of patients who are undergoing eye treatment. It is extremely useful as protective glasses for protecting

[0050]

According to the spectacle lens of the present invention, transmission of harmful rays of infrared rays, ultraviolet rays, and blue light is selectively blocked, so that a sharp and three-dimensional field of view can be obtained.
Even if it is used in a place where the sun's rays are extremely strong, or if it is used by a person with weak eyesight, it is possible to prevent damage to the eyes due to harmful rays.

[0051]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples. In addition, in an Example, a part represents a weight part. The transmission spectrum of the obtained lens was measured with a spectrophotometer (U-3410 type manufactured by Hitachi, Ltd.).

Example 1 Ultraviolet absorber (manufactured by Riken Vitamin KK, Rikemar S)
Bisphenol A type polycarbonate containing 0.1% of -100A) [L-1225L manufactured by Teijin Chemicals Ltd.]
100 parts, 0.1 part of a dithiol nickel complex-based near-infrared absorber [Dainippon Ink and Chemicals, Inc., Spandai IR Additive 200], and blue light absorber [Nippon Kayaku, Kayaset Yellow] A-G (Disperse Yellow 54)] 0.03 part, and a mixture containing a small amount of a blue dye and a red dye are melted at 250 ° C., and molded by an injection molding machine using a predetermined mold to obtain an outer diameter. A plastic lens having a diameter of 75 mm and a center thickness of 2 mm was obtained. The measurement result of the transmission spectrum of the obtained lens is shown in FIG.

As can be seen in FIG. 1, this lens selectively blocks transmission of UV, blue and near infrared light.

[Brief description of drawings]

FIG. 1 is a diagram showing a transmission spectrum of a lens obtained in Example 1.

Claims (5)

[Claims] 1. A means for controlling the transmission of infrared rays, which comprises an ultraviolet absorber and a blue light absorber, transmits at least visible light in the wavelength range of 530 to 730 nm, and transmits average light in the wavelength range of 450 to 750 nm. A spectacle lens with a rate of 5% or more. 2. The spectacle lens according to claim 1, which comprises a dithiol nickel complex infrared absorber as a means for controlling the transmission of infrared rays. 3. The spectacle lens according to claim 1, which contains a yellow dye and / or an orange dye as the blue light absorber. 4. A wavelength range of 200 to 400 nm and 780 to 780.
Average light transmittance in the 950 nm region is less than 0.3%, wavelength 4
The spectacle lens according to claim 1, which has an average light transmittance of less than 3.5% in the wavelength region of 0 to 440 nm and is 10% or more in the wavelength region of 450 to 730 nm. 5. The ratio (A / B) of the average light transmittance (A%) in the wavelength range of 400 to 440 nm and the average light transmittance (B%) in the wavelength range of 450 to 730 nm is A / B ≦ 0. The spectacle lens according to claim 4, which is 3.