JP2023111781A - Optical sheet and optical component - Google Patents

Abstract

To provide an optical sheet and an optical component that can improve an anti-glare property against an LED lamp and enhance an identification property of a specified color.SOLUTION: An optical sheet is constituted of a material including a resin and at least one kind of a light absorber, and comprises a light absorbing layer for absorbing light of a specified wavelength range in a visible light range, the optical sheet having, in a light absorption spectrum, a first peak having a peak wavelength P1 of an absorption rate at a first wavelength range of 400 nm or more and 480 nm or less, and a second peak having a peak wavelength P2 of an absorption rate at a second wavelength range of 530 nm or more and 630 nm or less. A transmissivity at the peak wavelength P1 is 10% or more and 70% or less, and a transmissivity at the peak wavelength P2 is 75% or more and 85% or less.SELECTED DRAWING: Figure 6

Description

The present invention relates to optical sheets and optical components.

For example, an optical sheet having a polarizing function is known for the purpose of increasing the contrast of the field of view and anti-glare (for example, see Patent Document 1). This optical sheet is used by attaching it to eyeglasses, sunglasses, sun visors, and the like.

The optical sheet described in Patent Document 1 includes, for example, a layer containing a resin material and a dye (light absorber) that is contained in the resin material and absorbs light of a specific wavelength in the visible light region. It is manufactured by stretching in one direction.

However, depending on the type and compounding ratio of the light absorbing agent, when used during driving, the LED headlamps of oncoming vehicles and the like may be dazzling. This point has not been sufficiently studied in the past.

WO2014/115705

SUMMARY OF THE INVENTION An object of the present invention is to provide an optical sheet and an optical component capable of enhancing anti-glare properties against LED lamps and enhancing the distinguishability of specific colors.

Such objects are achieved by the present invention of the following (1) to (5).
(1) An optical sheet comprising a light-absorbing layer made of a material containing a resin and at least one light-absorbing agent and absorbing light in a specific wavelength range in the visible light range,
The optical sheet has a first peak having an absorptance peak wavelength P1 in a first wavelength region of 400 nm or more and 480 nm or less and a absorptance peak wavelength P2 in a second wavelength region of 530 nm or more and 630 nm or less in the light absorption spectrum. and a second peak having
The transmittance at the peak wavelength P1 is 10% or more and 70% or less,
An optical sheet having a transmittance of 75% or more and 85% or less at the peak wavelength P2.

(2) The peak full width W1 [nm] at which the absorbance is 75% of the peak top intensity of the first peak is 5 nm or more and 60 nm or less, and the peak top intensity of the second peak The optical sheet according to (1) above, wherein the full peak width W2 [nm] at which the intensity is 75% is 5 nm or more and 120 nm or less.

(3) The optical sheet according to (1) or (2) above, wherein the first peak has a third peak having a transmittance peak wavelength P3.

(4) The optical sheet according to (3) above, wherein the transmittance at the peak wavelength P3 is 10% or more and 70% or less.

(5) a substrate;
An optical component comprising: the optical sheet according to any one of (1) to (4) laminated on the substrate.

Advantageous Effects of Invention According to the present invention, it is possible to provide an optical sheet and an optical component that enable a user to distinguish between colors by enhancing anti-glare properties against LED lamps.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view of sunglasses provided with the optical sheet (1st Embodiment) of this invention. 1 is a perspective view of a sun visor provided with an optical sheet (first embodiment) of the present invention; FIG. FIG. 2 is a side view schematically showing an optical sheet manufacturing apparatus that manufactures the optical sheet shown in FIG. 1; FIG. 2 is a cross-sectional view schematically showing an optical component manufacturing apparatus that manufactures the optical component shown in FIG. 1; 2 is a cross-sectional view of the optical component shown in FIG. 1; FIG. 6 is a graph showing the light absorption spectrum of the optical sheet shown in FIG. 5; 6 is a graph showing the absorbance spectrum of the optical sheet shown in FIG. 5; 5 is a graph showing light absorption spectra of optical sheets according to respective examples.

BEST MODE FOR CARRYING OUT THE INVENTION The optical sheet and optical component of the present invention will be described in detail below based on preferred embodiments shown in the accompanying drawings.

<First embodiment>
FIG. 1 is a perspective view of sunglasses provided with an optical sheet (first embodiment) of the present invention. FIG. 2 is a perspective view of a sun visor provided with the optical sheet (first embodiment) of the present invention. 5 is a cross-sectional view of the optical component shown in FIG. 1. FIG. 6 is a graph showing the light absorption spectrum of the optical sheet shown in FIG. 5. FIG.

1, 2, and 5, the upper side is also called "upper" or "upper", and the lower side is also called "lower" or "lower". In addition, in the drawings referred to in this specification, the dimensions in the thickness direction are exaggerated and differ greatly from the actual dimensions.

The optical sheet 1 of the present invention shown in FIGS. 1, 2 and 5 is composed of a material containing a resin and at least one light absorbing agent, and absorbs light in a specific wavelength range in the visible light range. It has an absorbent layer. In addition, the optical sheet 1 has a first peak Pa having an absorptance peak wavelength P1 in a first wavelength region of 400 nm or more and 480 nm or less and an absorptance peak in a second wavelength region of 530 nm or more and 630 nm or less in the light absorption spectrum. and a second peak Pb having a wavelength P2, the transmittance at the peak wavelength P1 is 10% or more and 70% or less, and the transmittance at the peak wavelength P2 is 75% or more and 85% or less.

Since the light absorption spectrum has the first peak Pa, anti-glare properties for LED lamps can be enhanced. Further, since the light absorption spectrum has the second peak Pb, it is possible to enhance the distinguishability of blue.

Furthermore, the transmittance at the peak wavelength P1 is 10% or more and 70% or less, and the transmittance at the peak wavelength P2 is 75% or more and 85% or less. Therefore, it is possible to more reliably improve the anti-glare property against the LED lamp and to more reliably enhance the distinguishability of blue.

If the first peak is omitted, the anti-glare property against the LED lamp is insufficient, and if the second peak is omitted, the ability to distinguish blue is insufficient.

Also, if the transmittance at the peak wavelength P1 is too high, the anti-glare property for the LED lamp will be insufficient, and if it is too low, selection of the coloring material will be difficult.

Also, if the transmittance at the peak wavelength P2 is too high, the ability to distinguish blue is insufficient, and if it is too low, it becomes difficult to select a coloring material.

T2/T1, which is the ratio of the transmittance T1 at the peak wavelength P1 to the transmittance T2 at the peak wavelength P2, is preferably 2.0 or more and preferably 15.0 or less. This makes it possible to exhibit high anti-glare properties for the LED lamp.

Such an optical sheet 1 is used for sunglasses (optical component 10) shown in FIG. 1 and a sun visor (optical component 10') shown in FIG.

As shown in FIG. 1, sunglasses (optical component 10) include a frame 2 to be worn on the user's head, and lenses 3 (optical component) with an optical sheet fixed to the frame 2. As shown in FIG. In this specification, the term "lens" includes both those having a light-condensing function and those not having a light-condensing function.

As shown in FIG. 1, the frame 2 is to be worn on the user's head, and includes a rim portion 21, a bridge portion 22, a temple portion 23 to be hung on the user's ears, and a nose pad portion 24. have. Each rim portion 21 has a ring shape, and is a portion where the lens 3 with an optical sheet is mounted inside.

The bridge portion 22 is a portion that connects the rim portions 21 . The temple portion 23 has a temple shape and is connected to the edge of each rim portion 21 . This temple portion 23 is a portion that is put on the ear of the user. The nose pad portion 24 is a portion that contacts the user's nose when the sunglasses (optical component 10) are worn on the user's head. As a result, the mounted state can be stably maintained.

Note that the shape of the frame 2 is not limited to that shown in the drawings as long as it can be worn on the user's head.

The optical component of the present invention has a lens 4 (base material) and an optical sheet 1 laminated on the front side of the lens 4 (the side opposite to the human eye when worn). Thereby, while enjoying the advantages of the optical sheet 1 described above, it is possible to exhibit the function as spectacles.

As shown in FIG. 2, the sun visor (optical component 10') has a ring-shaped mounting portion 5 to be mounted on the user's head and a collar 6 provided in front of the mounting portion 5. there is The collar 6 has a light-transmitting member 7 (base material) and the optical sheet 1 provided on the upper surface of the light-transmitting member 7 . As a result, the function as a sun visor can be exhibited while enjoying the advantages of the optical sheet 1 described above.

The materials for the lenses 4 and the light-transmitting member 7 are not particularly limited as long as they have light-transmitting properties, and include various resin materials and various glasses. Polycarbonate is preferred. Thereby, the adhesion between the lens 4 or the light transmissive member 7 and the optical sheet 1 can be enhanced.

The optical sheet 1 will be described in detail below. In addition, below, the case where it laminates|stacks on the lens 4 (base material) is demonstrated typically.

As shown in FIG. 5, the optical sheet 1 has a specific wavelength absorption layer 11 . The optical sheet 1 may have a polarizing layer, a protective layer, an adhesive layer, etc., in addition to the specific wavelength absorbing layer 11 . The optical sheet 1 is bonded to the lens 4 so that the specific wavelength absorption layer 11 is located on the lens 4 side.

(specific wavelength absorption layer)
The specific wavelength absorption layer 11 is mainly made of polycarbonate, and contains a light absorber and an ultraviolet absorber. The term "main material" as used herein refers to a component whose content in the specific wavelength absorption layer 11 is 50% or more.

The resin of the main material is not particularly limited, and examples thereof include polycarbonate, polyamide, polyvinyl chloride, polyethylene, polypropylene, etc. Among these, polycarbonate is preferable.

The polycarbonate is not particularly limited, and various kinds of polycarbonates can be used. Among them, aromatic polycarbonates are preferable. Aromatic polycarbonate has an aromatic ring in its main chain, which makes it possible to improve the strength of the optical sheet 1 .

This aromatic polycarbonate is synthesized, for example, by interfacial polycondensation reaction between bisphenol and phosgene, transesterification reaction between bisphenol and diphenyl carbonate, and the like.

Examples of bisphenol include bisphenol A and bisphenol (modified bisphenol) that is the origin of repeating units of polycarbonate represented by the following formula (1).

（式（１）中、Ｘは、炭素数１～１８のアルキル基、芳香族基または環状脂肪族基であり、ＲａおよびＲｂは、それぞれ独立して、炭素数１～１２のアルキル基であり、ｍおよびｎは、それぞれ０～４の整数であり、ｐは、繰り返し単位の数である。）

(In formula (1), X is an alkyl group having 1 to 18 carbon atoms, an aromatic group or a cycloaliphatic group, and Ra and Rb are each independently an alkyl group having 1 to 12 carbon atoms. , m and n are each integers from 0 to 4, and p is the number of repeating units.)

Specific examples of the bisphenol, which is the origin of the repeating unit of the polycarbonate represented by the formula (1), include 4,4′-(pentane-2,2-diyl)diphenol, 4,4′-( pentane-3,3-diyl)diphenol, 4,4'-(butane-2,2-diyl)diphenol, 1,1'-(cyclohexanediyl)diphenol, 2-cyclohexyl-1,4-bis( 4-hydroxyphenyl)benzene, 2,3-biscyclohexyl-1,4-bis(4-hydroxyphenyl)benzene, 1,1′-bis(4-hydroxy-3-methylphenyl)cyclohexane, 2,2′- Bis(4-hydroxy-3-methylphenyl)propane and the like can be mentioned, and one or more of these can be used in combination.

In particular, as the polycarbonate, it is preferable that the main component is a bisphenol-type polycarbonate having a skeleton derived from bisphenol. By using such a bisphenol type polycarbonate, the optical sheet 1 exhibits even better strength.

The average molecular weight of such a polycarbonate is preferably from 20,000 to 30,000, more preferably from 23,000 to 28,000, and even more preferably from 24,000 to 27,500.

Thereby, the strength of the optical sheet 1 can be sufficiently increased. In addition, the fluidity of the polycarbonate in its molten state can be sufficiently enhanced. As a result, when the optical sheet 1 is manufactured by, for example, extrusion molding, the extrusion molding can be performed in a state in which the molten polycarbonate and the light absorbing agent are sufficiently mixed. Therefore, it is possible to prevent the light absorbing agent from being excessively aggregated after molding. Furthermore, since the viscosity-average molecular weight Mv of the polycarbonate is 20000 or more and 30000 or less, it has sufficient strength. As described above, the optical sheet 1 of the present invention prevents aggregation of the light absorbent and has sufficient strength.

Further, the polycarbonate preferably has a melt flow rate (MFR) of 3 g/10 min or more and 30 g/10 min or less, more preferably 15 g/10 min or more and 25 g/10 min or less, as measured according to JIS K7210. . This can sufficiently enhance the fluidity of the polycarbonate in the molten state. Therefore, for example, when manufacturing the optical sheet 1 by extrusion molding, the extrusion molding can be performed in a state in which the molten polycarbonate and the light absorbing agent are sufficiently mixed.

The polycarbonate preferably has a water absorption of 0.02% or more and 0.2% or less, more preferably 0.04% or more and 0.15% or less. As a result, extrusion molding can be performed in a state in which the molten polycarbonate and the light absorbing agent are sufficiently mixed. Therefore, it is possible to prevent excessive aggregation of the light absorbing agent.

In addition, the water absorption in this specification is a value measured by Aquatrack 3E (manufactured by Brabender).

The content of polycarbonate in the specific wavelength absorption layer 11 is preferably 87 wt % or more and 99.949 wt % or less, more preferably 90 wt % or more and 99.87 wt % or less. Thereby, the effects of the present invention can be exhibited more reliably.

<Light absorber>
A light absorber absorbs light of a specific wavelength. In this specification, "absorb light" means that the value of the maximum absorption wavelength in the visible light region of 420 nm to 780 nm is λ1, the value 20 nm lower than λ1 is λ2, and the value 20 nm higher is λ1. λ3 means that the absorbance λ1/λ2 or the absorbance λ1/λ3 is 1.0 or more.

The light absorbing agent is not particularly limited as long as it absorbs light of a specific wavelength in the wavelength range of 350 nm or more and 780 nm or less. Examples include polymethine dyes, porphyrin complex dyes, phthalocyanine dyes, and the like, and one or more of these may be used in combination.

Examples of quinoline dyes include 2-methylquinoline, 3-methylquinoline, 4-methylquinoline, 6-methylquinoline, 7-methylquinoline, 8-methylquinoline, 6-isopropylquinoline, 2,4-dimethylquinoline, Alkyl-substituted quinoline compounds such as 2,6-dimethylquinoline and 4,6,8-trimethylquinoline, 2-aminoquinoline, 3-aminoquinoline, 5-aminoquinoline, 6-aminoquinoline, 8-aminoquinoline, 6-amino -Amino group-substituted quinoline compounds such as 2-methylquinoline, alkoxy group-substituted quinoline compounds such as 6-methoxy-2-methylquinoline and 6,8-dimethoxy-4-methylquinoline, 6-chloroquinoline, 4,7-dichloro Examples thereof include halogen-substituted quinoline compounds such as quinoline, 3-bromoquinoline, and 7-chloro-2-methylquinoline.

By blending such a quinoline dye, it is possible to absorb light with a wavelength range of 350 nm or more and 550 nm or less among light incident on the specific wavelength absorption layer 11 . In addition, it preferably has an absorption peak in a wavelength range of 400 nm or more and 550 nm or less.

Examples of anthraquinone dyes include (1) 2-anilino-1,3,4-trifluoroanthraquinone, (2) 2-(o-ethoxycarbonylanilino)-1,3,4-trifluoroanthraquinone, ( 3) 2-(p-ethoxycarbonylanilino)-1,3,4-trifluoroanthraquinone, (4) 2-(m-ethoxycarbonylanilino)-1,3,4-trifluoroanthraquinone, (5) 2-(o-cyanoanilino)-1,3,4-trifluoroanthraquinone, (6) 2-(p-cyanoanilino)-1,3,4-trifluoroanthraquinone, (7) 2-(m-cyanoanilino)- 1,3,4-trifluoroanthraquinone, (8) 2-(o-nitroanilino)-1,3,4-trifluoroanthraquinone, (9) 2-(p-nitroanilino)-1,3,4-trifluoro anthraquinone, (10) 2-(m-nitroanilino)-1,3,4-trifluoroanthraquinone, (11) 2-(p-tert-butylanilino)-1,3,4-trifluoroanthraquinone, (12 ) 2-(o-methoxyanilino)-1,3,4-trifluoroanthraquinone, (13) 2-(2,6-diisopropylanilino)-1,3,4-trifluoroanthraquinone, (14) 2 -(2,6-dichloroanilino)-1,3,4-trifluoroanthraquinone, (15) 2-(2,6-difluoroanilino)-1,3,4-trifluoroanthraquinone, (16) 2 -(3,4-dicyanoanilino)-1,3,4-trifluoroanthraquinone, (17) 2-(2,4,6-trichloroanilino)-1,3,4-trifluoroanthraquinone, (18) 2 -(2,3,5,6-tetrachloroanilino)-1,3,4-trifluoroanthraquinone, (19) 2-(2,3,5,6-tetrafluoroanilino)-1,3, 4-trifluoroanthraquinone, (20) 3-(2,3,4,5-tetrafluoroanilino)-2-butoxy-1,4-difluoroanthraquinone, (21) 3-(4-cyano-3-chloroanilino )-2-octyloxy-1,4-difluoroanthraquinone, (22) 3-(3,4-dicyanoanilino)-2-hexyloxy-1,4-difluoroanthraquinone, (23) 3-(4-cyano-3 -chloroanilino)-1,2-dibutoxy-4-fluoroanthraquinone, (24) 3-(p-cyanoanilino)-2-phenoxy-1,4-difluoroanthraquinone, (25) 3-(p-cyanoanilino)-2- (2,6-diethylphenoxy)-1,4-difluoroanthraquinone, (26) 3-(2,6-dichloroanilino)-2-(2,6-dichlorophenoxy)-1,4-difluoroanthraquinone, ( 27) 3-(2,3,5,6-tetrachloroanilino)-2-(2,6-dimethoxyphenoxy)-1,4-difluoroanthraquinone, (28) 2,3-dianilino-1,4- Difluoroanthraquinone, (29) 2,3-bis(p-tert-butylanilino)-1,4-difluoroanthraquinone, (30) 2,3-bis(p-methoxyanilino)-1,4-difluoroanthraquinone , (31) 2,3-bis(2-methoxy-6-methylanilino)-1,4-difluoroanthraquinone, (32) 2,3-bis(2,6-diisopropylanilino)-1,4-difluoroanthraquinone , (33) 2,3-bis(2,4,6-trichloroanilino)-1,4-difluoroanthraquinone, (34) 2,3-bis(2,3,5,6-tetrachloroanilino) -1,4-difluoroanthraquinone, (35) 2,3-bis(2,3,5,6-tetrafluoroanilino)-1,4-difluoroanthraquinone, (36) 2,3-bis(p-cyanoanilino )-1-methoxyethoxy-4-fluoroanthraquinone, (37) 2-(2,6-dichloroanilino)-1,3,4-trichloroanthraquinone, (38) 2-(2,3,5,6- tetrafluoroanilino)-1,3,4-trichloroanthraquinone, (39) 3-(2,6-dichloroanilino)-2-(2,6-dichlorophenoxy)-1,4-dichloroanthraquinone, (40 ) 2-(2,6-dichloroanilino)anthraquinone, (41) 2-(2,3,5,6-tetrafluoroanilino)anthraquinone, (42) 3-(2,6-dichloroanilino)- 2-(2,6-dichlorophenoxy)anthraquinone, (43) 2,3-bis(2-methoxy-6-methylanilino)-1,4-dichloroanthraquinone, (44) 2,3-bis(2,6- diisopropylanilino)anthraquinone, (45) 2-butylamino-1,3,4-trifluoroanthraquinone, (46) 1,4-bis(n-butylamino)-2,3-difluoroanthraquinone, (47) 1 ,4-bis(n-octylamino)-2,3-difluoroanthraquinone, (48) 1,4-bis(hydroxyethylamino)-2,3-difluoroanthraquinone, (49) 1,4-bis(cyclohexylamino )-2,3-difluoroanthraquinone, (50) 1,4-bis(cyclohexylamino)-2-octyloxy-3-fluoroanthraquinone, (51) 1,2,4-tris(2,4-dimethoxyphenoxy- 3-fluoroanthraquinone, (52) 2,3-bis(phenylthio)-1-phenoxy-4-fluoroanthraquinone, (53) 1,2,3,4-tetra(p-methoxyphenoxy)-anthraquinone and the like. .

By blending such an anthraquinone-based dye, it is possible to absorb light with a wavelength range of 450 nm or more and 600 nm or less among light incident on the specific wavelength absorption layer 11 . In addition, it preferably has an absorption peak in a wavelength range of 500 nm or more and 600 nm or less.

Perylene dyes include, for example, N,N'-bis(3,5-dimethylphenyl)-perylene-3,4,9,10-tetracarboxylic acid diimide, N,N'-dimethylperylene-3,4 ,9,10-tetracarboxylic diimide, N,N'-diethylperylene-3,4,9,10-tetracarboxylic diimide, N,N'-bis(4-methoxyphenyl)-perylene-3,4, 9,10-tetracarboxylic diimide, N,N'-bis(4-ethoxyphenyl)-perylene-3,4,9,10-tetracarboxylic diimide, N,N'-bis(4-chlorophenyl)-perylene -3,4,9,10-tetracarboxylic acid diimide and the like, but N,N'-bis(3,5-dimethylphenyl)-perylene-3,4,9,10-tetracarboxylic acid diimide is particularly preferable.

By blending such a perylene-based dye, it is possible to absorb light with a wavelength range of 400 nm or more and 800 nm or less among light incident on the specific wavelength absorption layer 11 . It should be noted that it preferably has an absorption peak in the wavelength range of 600 nm or more and 780 nm or less.

Polymethine dyes include streptocyanin, open-chain cyanine, hemicyanine, closed-chain cyanine, merocyanine, and the like.

By blending such a polymethine dye, it is possible to absorb light with a wavelength range of 400 nm or more and 700 nm or less among light incident on the specific wavelength absorption layer 11 . It should be noted that it preferably has an absorption peak in the wavelength range of 450 nm or more and 550 nm or less.

Porphyrin complex dyes include tetraazaporphyrin metal complexes, tetraarylporphyrins, octaethylporphyrins, and the like.

By blending such a porphyrin complex dye, it is possible to absorb light with a wavelength range of 500 nm or more and 700 nm or less among light incident on the specific wavelength absorption layer 11 . In addition, it preferably has an absorption peak in a wavelength range of 550 nm or more and 600 nm or less.

Phthalocyanine dyes include CoPc-4-sulfonic acid sodium salt, cobalt Pc tetracarboxylic acid, octahydroxy NiPc, and the like.

By blending such a phthalocyanine dye, it is possible to absorb light with a wavelength range of 550 nm or more and 750 nm or less among light incident on the specific wavelength absorption layer 11 . In addition, it preferably has an absorption peak in a wavelength range of 550 nm or more and 600 nm or less.

Light in a specific wavelength range can be absorbed by blending the light absorbing agent as described above. Therefore, for example, the user can clearly recognize the outline of an object or a person in the wearing state, and safety can be enhanced.

The content of the light absorbing agent (total of each light absorbing agent) in the specific wavelength absorption layer 11 is preferably 0.001 wt% or more and 5 wt% or less, more preferably 0.003 wt% or more and 4 wt% or less. preferable. Thereby, the above effect can be exhibited more reliably. If the content is too small, the effect as a light absorber may not be sufficiently obtained. On the other hand, when the content is too large, the light absorbent tends to aggregate easily.

Further, the basis weight of the light absorbing agent (total of each light absorbing agent) in the specific wavelength absorption layer 11 is preferably 0.05 mg/m ² or more and 500 mg/m ² or less, and 1 mg/m ² or more and 100 mg/m 2 or more. It is more preferably ² or less. Thereby, the effects of the present invention can be exhibited more reliably.

<Ultraviolet absorber>
The ultraviolet absorber absorbs ultraviolet rays (light with a wavelength range of 100 nm or more and 420 nm or less). As a result, it is possible to reduce the exposure of the user's eyes to the ultraviolet rays, thereby protecting the user's eyes. Furthermore, it is possible to prevent deterioration of the light absorbing agent by ultraviolet rays. That is, the ultraviolet absorber functions as a deterioration inhibitor that prevents deterioration of the light absorber.

Examples of the ultraviolet absorber include, but are not limited to, triazine-based compounds, benzophenone-based compounds, benzotriazole-based compounds, and cyanoacrylate-based compounds, and one or more of these may be used in combination. Among these, triazine-based compounds are particularly preferably used. This makes it possible to prevent or suppress deterioration of the specific wavelength absorption layer 11 (polycarbonate and light absorber) due to ultraviolet rays, and improve the weather resistance of the optical sheet 1 .

Triazine compounds include 2-mono(hydroxyphenyl)-1,3,5-triazine compounds, 2,4-bis(hydroxyphenyl)-1,3,5-triazine compounds, 2,4,6-tris( hydroxyphenyl)-1,3,5-triazine compounds, specifically 2,4-diphenyl-6-(2-hydroxy-4-methoxyphenyl)-1,3,5-triazine, 2, 4-diphenyl-6-(2-hydroxy-4-ethoxyphenyl)-1,3,5-triazine, 2,4-diphenyl-(2-hydroxy-4-propoxyphenyl)-1,3,5-triazine, 2,4-diphenyl-(2-hydroxy-4-butoxyphenyl)-1,3,5-triazine, 2,4-diphenyl-6-(2-hydroxy-4-butoxyphenyl)-1,3,5- Triazine, 2,4-diphenyl-6-(2-hydroxy-4-hexyloxyphenyl)-1,3,5-triazine, 2,4-diphenyl-6-(2-hydroxy-4-octyloxyphenyl)- 1,3,5-triazine, 2,4-diphenyl-6-(2-hydroxy-4-dodecyloxyphenyl)-1,3,5-triazine, 2,4-diphenyl-6-(2-hydroxy-4 -benzyloxyphenyl)-1,3,5-triazine, 2,4-diphenyl-6-(2-hydroxy-4-butoxyethoxy)-1,3,5-triazine, 2,4-bis(2-hydroxy -4-butoxyphenyl)-6-(2,4-dibutoxyphenyl)-1,3-5-triazine, 2,4,6-tris(2-hydroxy-4-methoxyphenyl)-1,3,5 -triazine, 2,4,6-tris(2-hydroxy-4-ethoxyphenyl)-1,3,5-triazine, 2,4,6-tris(2-hydroxy-4-propoxyphenyl)-1,3 ,5-triazine, 2,4,6-tris(2-hydroxy-4-butoxyphenyl)-1,3,5-triazine, 2,4,6-tris(2-hydroxy-4-hexyloxyphenyl)- 1,3,5-triazine, 2,4,6-tris(2-hydroxy-4-octyloxyphenyl)-1,3,5-triazine, 2,4,6-tris(2-hydroxy-4-dodecyl oxyphenyl)-1,3,5-triazine, 2,4,6-tris(2-hydroxy-4-benzyloxyphenyl)-1,3,5-triazine, 2,4,6-tris(2-hydroxy -4-ethoxyethoxyphenyl)-1,3,5-triazine, 2,4,6-tris(2-hydroxy-4-butoxyethoxyphenyl)-1,3,5-triazine, 2,4,6-tris (2-hydroxy-4-propoxyethoxyphenyl)-1,3,5-triazine, 2,4,6-tris(2-hydroxy-4-methoxycarbonylpropyloxyphenyl)-1,3,5-triazine, 2 , 4,6-tris(2-hydroxy-4-ethoxycarbonylethyloxyphenyl)-1,3,5-triazine, 2,4,6-tris(2-hydroxy-4-(1-(2-ethoxyhexyl) oxy)-1-oxopropan-2-yloxy)phenyl)-1,3,5-triazine, 2,4,6-tris(2-hydroxy-3-methyl-4-methoxyphenyl)-1,3,5 -triazine, 2,4,6-tris(2-hydroxy-3-methyl-4-ethoxyphenyl)-1,3,5-triazine, 2,4,6-tris(2-hydroxy-3-methyl-4 -propoxyphenyl)-1,3,5-triazine, 2,4,6-tris(2-hydroxy-3-methyl-4-butoxyphenyl)-1,3,5-triazine, 2,4,6-tris (2-hydroxy-3-methyl-4-hexyloxyphenyl)-1,3,5-triazine, 2,4,6-tris(2-hydroxy-3-methyl-4-octyloxyphenyl)-1,3 ,5-triazine, 2,4,6-tris(2-hydroxy-3-methyl-4-dodecyloxyphenyl)-1,3,5-triazine, 2,4,6-tris(2-hydroxy-3- methyl-4-benzyloxyphenyl)-1,3,5-triazine, 2,4,6-tris(2-hydroxy-3-methyl-4-ethoxyethoxyphenyl)-1,3,5-triazine, 2, 4,6-tris(2-hydroxy-3-methyl-4-butoxyethoxyphenyl)-1,3,5-triazine, 2,4,6-tris(2-hydroxy-3-methyl-4-propoxyethoxyphenyl )-1,3,5-triazine, 2,4,6-tris(2-hydroxy-3-methyl-4-methoxycarbonylpropyloxyphenyl)-1,3,5-triazine, 2,4,6-tris (2-hydroxy-3-methyl-4-ethoxycarbonylethyloxyphenyl)-1,3,5-triazine, 2,4,6-tris(2-hydroxy-3-methyl-4-(1-(2- ethoxyhexyloxy)-1-oxopropan-2-yloxy)phenyl)-1,3,5-triazine and the like. Examples of commercial products of triazine-based ultraviolet absorbers include "TINUVIN 1577", "TINUVIN 460", "TINUVIN 477" (manufactured by BASF Japan), and "ADEKA STAB LA-F70" (manufactured by ADEKA).

The specific wavelength absorption layer 11 further contains an ultraviolet absorber that absorbs light in the wavelength range of 100 nm or more and 420 nm or less as described above, so that the wavelength range of the light incident on the specific wavelength absorption layer 11 is 100 nm or more and 420 nm. It can absorb the following light. This makes it possible to prevent or suppress deterioration of the specific wavelength absorption layer 11 (polycarbonate and light absorber) due to ultraviolet rays, and improve the weather resistance of the optical sheet 1 .

The content of the ultraviolet absorbent in the specific wavelength absorption layer 11 is preferably 0.05 wt % or more and 8 wt % or less, and more preferably 0.07 wt % or more and 6 wt % or less. Thereby, the above effect can be exhibited more reliably. If the content is too small, there is a possibility that the effect as an ultraviolet absorber cannot be sufficiently obtained. On the other hand, when the content is too large, the ultraviolet absorber tends to aggregate easily.

Further, the basis weight of the ultraviolet absorbent in the specific wavelength absorption layer 11 is preferably 0.01 g/m ² or more and 100 g/m ² or less, and more preferably 0.1 g/m ² or more and 10 g/m ² or less. more preferred. Thereby, the above effect can be exhibited more reliably.

Although the thickness of the specific wavelength absorption layer 11 is not particularly limited, it is preferably 0.05 mm or more and 1.5 mm or less, and more preferably 0.3 mm or more and 0.7 mm or less. As a result, it is possible to improve the handleability and prevent the optical component as a whole from being unnecessarily thick.

Further, the specific wavelength absorption layer 11 may be manufactured by stretching or may be manufactured without stretching, but the degree of stretching is preferably 10% or less. It is more preferably 5% or less. This makes it possible to prevent or suppress the occurrence of color unevenness, light absorbent unevenness, and ultraviolet absorbent unevenness during stretching.

Further, it is preferable to satisfy t1<t2, where t1 is the melting point of the polycarbonate and t2 is the melting point of the light absorbing agent. As a result, when the polycarbonate in a molten state is mixed with the light absorbing agent, it is possible to prevent the light absorbing agent from deteriorating or discoloring due to heat.

Further, it is preferable to satisfy t1<t3, where t1 is the melting point of the polycarbonate and t3 is the melting point of the ultraviolet absorber. As a result, when the molten polycarbonate and the UV absorber are mixed, it is possible to prevent the UV absorber from deteriorating or discoloring due to heat.

The melting point t1 of polycarbonate is preferably 250° C. or higher and 400° C. or lower, and more preferably 270° C. or higher and 350° C. or lower.

The melting point t2 of the light absorbing agent is preferably 300° C. or higher and 400° C. or lower, and more preferably 330° C. or higher and 360° C. or lower. Also, the melting point t3 of the ultraviolet absorber is preferably 310° C. or higher and 370° C. or lower, and more preferably 340° C. or higher and 360° C. or lower. By setting the melting points t1 to t3 within the above numerical range, the above effect can be exhibited more reliably.

Note that the light absorbing agent may be a dye different from the dyes listed above. Examples of the coloring matter include, but are not limited to, pigments, dyes, and the like, and these can be used singly or in combination. Moreover, it can be used by mixing with the above-mentioned.

Examples of pigments include, but are not limited to, phthalocyanine-based pigments such as phthalocyanine green and phthalocyanine blue, fast yellow, disazo yellow, condensed azo yellow, benzimidazolone yellow, dinitroaniline orange, penzimidazolone orange, toluidine red, and permanents. Azo pigments such as carmine, permanent red, naphthol red, condensed azo red, benzimidazolone carmine, benzimidazolone brown; anthraquinone pigments such as anthrapyrimidine yellow and anthraquinonyl red; azomethine pigments such as copper azomethine yellow; Quinophthalone pigments such as yellow, isoindoline pigments such as isoindoline yellow, nitroso pigments such as nickeldioxime yellow, perinone pigments such as perinone orange, quinacridone pigments such as quinacridone magenta, quinacridone maroon, quinacridone scarlet, and quinacridone red. perylene pigments such as perylene red and perylene maroon, pyrrolopyrrole pigments such as diketopyrrolopyrrole red, organic pigments such as dioxazine pigments such as dioxazine violet, carbon black, lamp black, furnace black, ivory Carbon pigments such as black, graphite, and fullerene; chromate pigments such as yellow lead and molybdate orange; cadmium yellow; cadmium lithopone yellow; cadmium orange; , sulfide pigments such as sulfide, ocher, titanium yellow, titanium barium nickel yellow, red iron oxide, red lead, amber, brown iron oxide, zinc iron chrome brown, chromium oxide, cobalt green, cobalt chrome green, titanium cobalt green, cobalt Oxide pigments such as blue, cerulean blue, cobalt aluminum chrome blue, iron black, manganese ferrite black, cobalt ferrite black, copper chrome black, copper chromium manganese black, hydroxide pigments such as Viridian, ferrocyanine such as Prussian blue compound pigments, silicate pigments such as ultramarine blue, phosphate pigments such as cobalt violet and mineral violet, and other inorganic pigments (such as cadmium sulfide, cadmium selenide, etc.). can be used in combination of one or more.

Examples of dyes include, but are not limited to, quinophthalone dyes, metal complex dyes, cyan dyes, xanthene dyes, merocyanine dyes, phthalocyanine dyes, azo dyes, hibiscus dyes, blackberry dyes, raspberry dyes, and pomegranate dyes. Porphyrin compounds such as fruit juice pigments, chlorophyll pigments, and tetraazoporphyrin compounds can be used, and one or more of these can be used in combination.

The optical sheet 1 as described above preferably has a total thickness of 0.1 mm or more and 2 mm or less.

Since such an optical sheet 1 has the structure described above, it can absorb light in a specific wavelength range, and the user can clearly recognize the contours and colors of objects and people when worn. can improve safety. That is, the optical sheet 1 has high contrast and high color discrimination.

Further, by adjusting the wavelength range of light absorbed by the light absorbing agent contained in each layer, light of a predetermined color can be emphasized to the user. In the optical sheet 1, which color is desired to be emphasized to the user by selecting the type of the light absorbing agent in the specific wavelength absorbing layer 11 and the first to third light absorbing agents in the polarizing layer 12, adjusting the compounding amount, etc. , and which color the visibility of which is desired to be particularly enhanced can be set as appropriate.

However, conventionally, sufficient research has been conducted on what kind of optical characteristics the optical sheet 1 as a whole should have, that is, what kind of light absorption spectrum it should have. I didn't. Therefore, the present inventors have made extensive studies, and by configuring the optical sheet 1 to have the following light absorption spectrum, the optical sheet 1 has high contrast and high color discrimination. The present inventors have found that it becomes a product, and have completed the present invention. This will be explained below.

FIG. 6 is a graph showing light absorption spectra (S1, S2, S3) of the optical sheet 1, in which the horizontal axis is the wavelength (nm) and the vertical axis is the transmittance (%). It is also assumed that the transmittance on the vertical axis is correlated with the light absorptance, that is, the higher the light absorptance, the lower the transmittance, and the lower the light absorptance, the higher the transmittance.

The optical sheet 1 of the present invention has, in the light absorption spectrum shown in FIG. and a second peak Pb having an absorptance peak wavelength P2, the transmittance at the peak wavelength P1 is 10% or more and 70% or less, and the transmittance at the peak wavelength P2 is 75% or more and 85% or less. is.

The transmittance at the peak wavelength P1 may be 10% or more and 70% or less, more preferably 15% or more and 40% or less, and even more preferably 18% or more and 38% or less. Thereby, the effect of the present invention can be obtained more significantly.

The transmittance at the peak wavelength P2 may be 65% or more and 85% or less, more preferably 70% or more and 80% or less, and even more preferably 73% or more and 78% or less. Thereby, the effect of the present invention can be obtained more significantly.

Since the light absorption spectrum has the first peak Pa, anti-glare properties for LED lamps can be enhanced. Further, since the light absorption spectrum has the second peak Pb, it is possible to enhance the distinguishability of blue.

Furthermore, the transmittance at the peak wavelength P1 is 10% or more and 70% or less, and the transmittance at the peak wavelength P2 is 75% or more and 85% or less. Therefore, it is possible to more reliably enhance the anti-glare property against the LED lamp and to more reliably enhance the distinguishability of blue.

If the first peak is omitted, the anti-glare property against the LED lamp is insufficient, and if the first peak is omitted, the distinguishability of blue is insufficient.

Also, if the transmittance at the peak wavelength P1 is too high, the anti-glare property for the LED lamp will be insufficient, and if it is too low, selection of the coloring material will be difficult.

Also, if the transmittance at the peak wavelength P2 is too high, the ability to distinguish blue is insufficient, and if it is too low, it becomes difficult to select a coloring material.

The half width W1 [nm] at the first peak Pa is preferably 3 nm or more and 15 nm or less, more preferably 5 nm or more and 13 nm or less. As a result, the light in the wavelength region near the peak wavelength P1 can be absorbed just enough, contributing to high anti-glare properties for the LED lamp.

The half width W2 [nm] at the second peak Pb is preferably 50 nm or more and 150 nm or less, more preferably 70 nm or more and 130 nm or less. As a result, the light in the wavelength region near the peak wavelength P2 can be absorbed just enough. In addition, it contributes to high identifiability of blue.

The half width W1 at the first peak Pa is defined as follows. First, the absorbance is measured outward on both sides of the peak wavelength P1 in increments of 2 nm from the peak wavelength P1, and the first wavelength (10 nm or more away from the center) at which the change in absorbance is 0.005 or less is selected. Two wavelengths are detected, and the wavelength with the higher transmittance is taken as the bottom wavelength. The width of the first peak Pa when the difference between the transmittance of the bottom wavelength and the transmittance of the peak wavelength P1 is half the value is defined as the half width of the first peak Pa.

Also, the half width W2 at the second peak Pb is defined as follows. First, the absorbance is measured outward from the peak wavelength P2 in increments of 2 nm on both sides of the peak wavelength P2. Two wavelengths are detected, and the wavelength with the higher transmittance is taken as the bottom wavelength. The width of the second peak Pb when the difference between the transmittance of the bottom wavelength and the transmittance of the peak wavelength P2 is half the value is defined as the half width of the second peak Pb.

Further, as shown in FIG. 7, the peak full width w1 [nm] at which the absorbance is 75% of the peak top intensity of the first peak is 5 nm or more and 60 nm or less, and the peak top of the second peak The full peak width w2 [nm] at which the intensity is 75% of the intensity is 5 nm or more and 120 nm or less. As a result, the light in the wavelength region near the peak wavelength P1 can be absorbed just enough, contributing to high anti-glare properties for the LED lamp. In addition, it contributes to high identifiability of blue.

Further, the first peak Pa has a third peak Pc having a transmittance peak wavelength P3. Thereby, the distinguishability of blue can be improved more remarkably.

The transmittance at the peak wavelength P3 is preferably 10% or more and 70% or less, and preferably 15% or more and 65% or less. This makes it possible to achieve both high anti-glare properties for LED lamps and high distinguishability of blue.

The half width W3 [nm] at the third peak Pc is preferably 3 nm or more and 15 nm or less, more preferably 5 nm or more and 13 nm or less. As a result, the light in the wavelength range near the peak wavelength P3 can be transmitted in just the right amount. In addition, it contributes to high identifiability of blue.

Also, the half width W3 at the third peak Pc is defined as follows. First, the absorbance is measured outward from the peak wavelength P3 in increments of 2 nm on both sides of the peak wavelength P3. Two wavelengths are detected, and the wavelength with the higher transmittance is taken as the bottom wavelength. The width of the third peak Pc when the difference between the transmittance of the bottom wavelength and the transmittance of the peak wavelength P3 is half the value is defined as the half width of the third peak Pc.

In this embodiment, when the first peak Pa is divided into two peaks via the third peak Pc, the right peak Pd has a lower transmittance than the left peak Pe. Thereby, the effect of the present invention can be obtained more significantly.

The difference between the minimum transmittance at the peak Pd and the minimum transmittance at the peak Pe is preferably 1% or more and 10% or less, more preferably 2% or more and 8% or less. Thereby, the above effect can be exhibited more reliably.

When obtaining the spectrum S1, it is preferable to use chirophthalone and anthraquinone as the colorant and to set the content as follows. This makes it possible to more reliably reproduce the light absorption spectrum S1.

The content of chirophthalone in the specific wavelength absorption layer 11 is preferably 0.001 wt % or more and 5 wt % or less, and more preferably 0.003 wt % or more and 4 wt % or less. Thereby, the above effect can be exhibited more reliably.

The content of anthraquinone in the specific wavelength absorption layer 11 is preferably 0.001 wt % or more and 5 wt % or less, more preferably 0.003 wt % or more and 4 wt % or less. Thereby, the above effect can be exhibited more reliably.

When obtaining the spectrum S2, it is preferable to use chirophthalone and anthraquinone as the colorant and to set the content as follows. Thereby, the optical absorption spectrum S2 can be reproduced more reliably.

The content of chirophthalone in the specific wavelength absorption layer 11 is preferably 0.001 wt % or more and 5 wt % or less, and more preferably 0.003 wt % or more and 4 wt % or less. Thereby, the above effect can be exhibited more reliably.

The content of anthraquinone in the specific wavelength absorption layer 11 is preferably 0.001 wt % or more and 5 wt % or less, more preferably 0.003 wt % or more and 4 wt % or less. Thereby, the above effect can be exhibited more reliably.

When obtaining the spectrum S3, it is preferable to use chirophthalone and anthraquinone as the colorant and to set the content as follows. This makes it possible to more reliably reproduce the light absorption spectrum S3.

The content of chirophthalone in the specific wavelength absorption layer 11 is preferably 0.001 wt % or more and 5 wt % or less, more preferably 0.003 wt % or more and 4 wt % or less. Thereby, the above effect can be exhibited more reliably.

The content of anthraquinone in the specific wavelength absorption layer 11 is preferably 0.001 wt % or more and 5 wt % or less, more preferably 0.003 wt % or more and 4 wt % or less. Thereby, the above effect can be exhibited more reliably.

Next, a method for manufacturing an optical sheet and a method for manufacturing an optical component will be described. An example of manufacturing an optical sheet using an extrusion method will be described below.

(Manufacturing method of optical sheet)
First, an optical sheet manufacturing apparatus used in this manufacturing method will be described.

3 is a side view schematically showing an optical sheet manufacturing apparatus for manufacturing the optical sheet shown in FIG. 1. FIG. 4 is a cross-sectional view schematically showing an optical component manufacturing apparatus for manufacturing the optical component shown in FIG. 1. FIG. In the following description, the upper side in FIG. 4 is called "upper", and the lower side is called "lower".

The optical sheet manufacturing apparatus 100 shown in FIG. 3 has a sheet supply section 200 and a sheet molding section 300 .

The sheet supply section 200 in this embodiment is composed of an extruder 210 and a T-die 220 connected to a molten resin discharge section of the extruder 210 via a pipe. The T-die 220 supplies the strip-shaped sheet 1 ′ in a molten or softened state to the sheet forming section 300 .

The T-die 220 is an extrusion molding unit that extrudes the melted or softened sheet 1 ′ into a belt-like sheet by an extrusion method. The T-die 220 is charged with the constituent material of the optical sheet 1 described above in a molten state, and by extruding the molten material from the T-die 220, the strip-shaped sheet 1' is continuously sent out. be

The sheet forming section 300 has a touch roll 310 , a cooling roll 320 , and a post-stage cooling roll 330 . These rolls are configured to rotate independently by motors (driving means) (not shown), respectively, and are cooled by the rotation of these rolls and fed out continuously. By continuously feeding the sheet 1' into the sheet molding section 300, the surface of the sheet 1' is flattened and the sheet 1' is set to a desired thickness and cooled. Then, the optical sheet 1 is obtained by cutting the cooled sheet 1' into a predetermined length.

The optical sheet of the present embodiment is manufactured by the optical sheet manufacturing method using the optical sheet manufacturing apparatus 100 as described above.

Manufacture of an optical sheet has an extrusion process, a molding process, and a cooling process.
First, a belt-like molten or softened sheet 1' is extruded (extrusion step). In this extrusion process, the extruder 210 is loaded with constituent materials of the optical sheet 1 (polycarbonate, light absorber, ultraviolet absorber, etc.). Further, the constituent material of the optical sheet 1 is in a melted or softened state inside the extruder 210 .

Next, the surface of the sheet 1' is flattened and the sheet 1' is set to have a predetermined thickness (forming step). This step is performed between the touch roll 310 and the cooling roll 320 .

Next, the surface of the sheet 1' is cooled (cooling step). This step is performed between the cooling roll 320 and the post cooling roll 330 .

The optical sheet 1 can be obtained through the above steps. Next, a method for manufacturing an optical component will be described.

(Method for manufacturing an optical component)
First, an optical component manufacturing apparatus used in this manufacturing method will be described.

An optical component manufacturing apparatus 400 shown in FIG. 4 has a resin supply section 500 and a mold 600 . The resin supply part 500 is filled with the polycarbonate described above. The mold 600 has a cavity 610 and a supply port 620 communicating between the inside and outside of the cavity 610 . Further, the mold 600 is composed of an upper member 630 and a lower member 640, and the mold 600 that defines the optical component manufacturing apparatus 400 is configured in an assembled state in which these members are assembled.

The optical component of this embodiment is manufactured by the optical component manufacturing method using the optical component manufacturing apparatus 400 as described above.

The optical component manufacturing method includes an optical sheet placement step and a lens material supply step.
First, with the upper member 630 and the lower member 640 disassembled, the optical sheet 1 is arranged on the bottom surface 641 of the lower member 640 (optical sheet arrangement step). Note that the bottom surface 641 is a curved concave surface, so that the lens 4 can be formed with a curved surface. Moreover, since the optical sheet 1 has flexibility, it is arranged following the shape of the bottom surface 641 .

Next, the upper member 630 and the lower member 640 are assembled, and a melted or softened lens material is poured through the supply port 620 (lens material supply step). Then, by cooling the lens material in a melted or softened state, a laminate in which the optical sheet 1 and the lenses are laminated can be obtained.

In the above description, the so-called sheet insert method was described as an example, but the present invention is not limited to this. good.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described ones, and modifications, improvements, etc. within the range that can achieve the object of the present invention are included in the present invention. is.

For example, each part constituting the optical sheet of the present invention can be replaced with an arbitrary structure capable of exhibiting the same function.

Further, the optical sheet of the present invention may be added with an arbitrary component in addition to the above-described configuration.

More specifically, for example, the optical sheet of the present invention may include a protective layer for protecting the surface, an intermediate layer, a power adjusting layer for adjusting the power as a lens, and the like.

EXAMPLES The present invention will now be described more specifically based on examples.
1. Examination of Optical Sheet 1-1. Preparation of optical sheet [Example 1]
First, 100 parts by mass of bisphenol A type polycarbonate (Mitsubishi Engineering-Plastics, "Iupilon E2000FN E5100"), 0.275 parts by mass of a light absorber (Kiwa Kagaku Kogyo Co., Ltd., "Yellow 2G"), By stirring and mixing 0.064 parts by mass of a light absorber (manufactured by Kiwa Kagaku Kogyo Co., Ltd., "Violed 2R"), a specific wavelength absorption layer forming material is prepared, and the specific wavelength absorption layer forming material is shown in FIG. It was placed in the extruder 210 of the optical sheet manufacturing apparatus 100 shown, melted, and extruded from the T-die 220 to obtain a specific wavelength absorption layer. The thickness of the obtained specific wavelength absorption layer was 0.3 mm.

[Examples 2, 3, 4, 5]
Optical sheets of Examples 2, 3, 4 and 5 were obtained in the same manner as in Example 1 except that the configuration of the optical sheet was changed as shown in Table 1.

[Comparative Examples 1 and 2]
Optical sheets of Comparative Examples 1 and 2 were obtained in the same manner as in Example 1 except that the configuration of the optical sheet was changed as shown in Table 1.

In addition, in Table 1, a1 indicates a bisphenol A type polycarbonate (manufactured by Mitsubishi Engineering-Plastics, "Iupilon E2000FN E5100").

Further, in Table 1, b1 indicates a light absorber (manufactured by Kiwa Kagaku Kogyo Co., Ltd., "Yellow 2G"), b2 indicates a light absorber (manufactured by Kiwa Kagaku Kogyo Co., Ltd., "Yellow HR"), b3 indicates a light absorber (“FDB-004” manufactured by Yamada Kagaku Kogyo Co., Ltd.).

Further, in Table 1, c indicates a light absorber (“Violed 2R” manufactured by Kiwa Kagaku Kogyo Co., Ltd.).

1-2. Evaluation The optical sheets of each example and each comparative example were evaluated by the following methods.

(Anti-glare evaluation for LED lamps)
An LED lamp was irradiated through the optical sheet manufactured as described above to confirm whether there was an antiglare effect.

A: Effective for 10 out of 10 people.
B: Effective for 6 to 9 out of 10 persons.
C: Effective for 2 to 5 out of 10 persons.
D: Effective for 1 person out of 10.

(Evaluation of blue distinguishability)
A blue modeled object was observed through the optical sheet manufactured as described above, and it was confirmed by 10 people whether they could correctly identify the color of the modeled object.

A: 10 out of 10 people could be identified.
B: 6 to 9 out of 10 persons could be identified.
C: 2 to 5 out of 10 persons could be identified.
D: 1 person out of 10 could be identified.

The evaluation results of the optical sheets of Examples and Comparative Examples obtained as described above are shown in Table 1 below and FIG. 8, respectively.

As shown in Table 1, the optical sheet of each example was able to emphasize blue more than the comparative example, and the results were satisfactory compared to the comparative example.

1 Optical sheet 1' Sheet 2 Frame 3 Lens with optical sheet 4 Lens 5 Mounting part 6 Collar 7 Light transmissive member 10 Optical part 10' Optical part 11 Specific wavelength absorption layer 12 Polarizing layer 21 Rim part 22 Bridge part 23 Temple part 24 Nose pad section 100 Optical sheet manufacturing device 200 Sheet supply section 210 Extruder 220 T die 300 Sheet molding section 310 Touch roll 320 Cool roll 330 Post-stage cooling roll 400 Optical component manufacturing apparatus 500 Resin supply section 600 Mold 610 Cavity 620 Supply port 630 Upper member 640 Lower member 641 Bottom surface P1 Peak wavelength P2 Peak wavelength P3 Peak wavelength Pa First peak Pb Second peak Pc Third peak Pd Peak Pe Peak T1 Transmittance T2 Transmittance

Claims (5)

An optical sheet comprising a light-absorbing layer made of a material containing a resin and at least one light-absorbing agent and absorbing light in a specific wavelength range in the visible light range,
The optical sheet has a first peak having an absorptance peak wavelength P1 in a first wavelength region of 400 nm or more and 480 nm or less and a absorptance peak wavelength P2 in a second wavelength region of 530 nm or more and 630 nm or less in the light absorption spectrum. and a second peak having
The transmittance at the peak wavelength P1 is 10% or more and 70% or less,
An optical sheet having a transmittance of 75% or more and 85% or less at the peak wavelength P2. In absorbance, the peak full width w1 [nm] at which the intensity is 75% with respect to the peak top intensity of the first peak is 5 nm or more and 60 nm or less, and is 75% with respect to the peak top intensity of the second peak. 2. The optical sheet according to claim 1, wherein the full width w2 [nm] of the intensity peak is 5 nm or more and 120 nm or less. 3. The optical sheet according to claim 1, wherein the first peak has a third peak having a transmittance peak wavelength P3. 4. The optical sheet according to claim 3, wherein the transmittance at the peak wavelength P3 is 10% or more and 70% or less. a substrate;
An optical component comprising: the optical sheet according to any one of claims 1 to 4 laminated on the substrate.

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