JP7417349B2 - Optical sheets and optical components - Google Patents

Description

The present invention relates to an optical sheet and an optical component.

For example, an optical sheet is known that absorbs a specific wavelength range from incident light for the purpose of increasing the contrast of the visual field or preventing glare (see, for example, Patent Document 1). This optical sheet is used by being attached to glasses, sunglasses, sun visors, etc.

The optical sheet described in Patent Document 1 includes, for example, a resin material and a dye (light absorbent) that is contained in the resin material and absorbs light of a specific wavelength among light in the visible light region. For example, in this way, in the light transmitted through the optical sheet, light in a wavelength range other than the light absorbed by the dye is emphasized, and the contrast of the visual field can be enhanced.

However, if an optical sheet simply contains a light absorbing agent that absorbs light in a wavelength range other than the wavelength range that is desired to be emphasized, it may become difficult to distinguish colors, or the effect of emphasizing light at a specific wavelength may become difficult. Sometimes you don't get enough. Conventionally, this point has not been sufficiently studied.

WO2014/115705

An object of the present invention is to provide an optical sheet and an optical component that can reliably emphasize light in the wavelength range of 430 nm or more and 470 nm or less for a user, and that also allow the user to identify colors. It is in.

Such objects are achieved by the present invention as described in (1) to (11) below.
(1) 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 light absorption layer has, in a light absorption spectrum, a first peak having an absorption peak wavelength P1 between 480 nm and 580 nm, and a second peak having an absorption peak wavelength P2 between 600 nm and 700 nm. , and
The light transmittance at the peak wavelength P1 is T1 [%], the light transmittance at the peak wavelength P2 is T2 [%], the half width at the peak wavelength P1 is W1 [nm], and the peak wavelength P2 is When the half-width at W2 [nm],
satisfies the relationship T1>T2 and satisfies the relationship W2>W1,
The light absorber includes a first light absorber and a second light absorber that contribute to the formation of the first peak, and a third light absorber that contributes to the formation of the second peak,
The peak wavelength of the absorption rate of the first light absorbent is smaller than the peak wavelength of the absorption rate of the second light absorbent,
The content of the first light absorber in the light absorption layer is A, the content of the second light absorber in the light absorption layer is B, and the content of the third light absorber in the light absorption layer. An optical sheet characterized in that, when the amount is C, A/B is 0.3 or more and 2 or less, and A/C is 0.01 or more and 0.2 or less .

(2) The T1 is 10% or more and 50% or less,
The optical sheet according to (1) above, wherein T2 is 0% or more and 20% or less.

(3) The W1 is 20 nm or more and 120 nm or less,
The optical sheet according to (1) or (2) above, wherein W2 is 30 nm or more and 150 nm or less.

( 4 ) The first light absorber , the second light absorber, and the third light absorber are at least one of a quinoline dye, a cyanine dye, a perylene dye, an anthraquinone dye, a porphyrin complex dye, and a phthalocyanine dye. The optical sheet according to any one of (1) to (3) above, which is a seed.

( 5 ) The content of the first light absorber in the light absorption layer is 0.0001 wt% or more and 1 wt% or less, and the content of the second light absorber in the light absorption layer is 0.0001 wt% or more and 1 wt% or less. The optical sheet according to any one of (1) to (4) above, which has a content of 0,001 wt% or more and 1 wt% or less.

( 6 ) The optical sheet according to any one of (1) to ( 5 ) above, wherein the resin is mainly polycarbonate.

( 7 ) The optical sheet according to ( 6 ) above, wherein the polycarbonate has a viscosity average molecular weight Mv of 20,000 or more and 30,000 or less.

( 8 ) The optical sheet according to any one of (1) to ( 7 ) above, wherein the light absorption layer contains a deterioration inhibitor that prevents deterioration of the light absorbent.

( 9 ) The above (1) wherein the hue a value of the light absorption layer measured at a viewing angle of 2° using a C light source is -2 or more and 6 or less, and the hue b value is -14 or more and -6 or less. The optical sheet according to any one of (8) to ( 8 ).

( 10 ) The optical sheet according to any one of (1) to ( 9 ) above, comprising a polarizing layer laminated on the light absorption layer and having a polarizing function.

( 11 ) Base material,
An optical component comprising: the optical sheet according to any one of (1) to ( 10 ) above, which is laminated on the base material.

According to the present invention, it is possible to provide an optical sheet that can reliably emphasize light in a wavelength range of 430 nm or more and 470 nm or less to a user, and also allows the user to distinguish colors.

FIG. 1 is a perspective view of sunglasses including an optical sheet (first embodiment) of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a sun visor including an optical sheet (first embodiment) of the present invention. 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. FIG. FIG. 2 is a cross-sectional view of the optical component shown in FIG. 1. FIG. FIG. 2 is a cross-sectional view of an optical component including an optical sheet (second embodiment) of the present invention. 2 is a graph showing a light spectrum of a light absorption layer (specific wavelength absorption layer) included in the optical sheet shown in FIG. 1. FIG.

Hereinafter, the optical sheet and optical component of the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.

<First embodiment>
FIG. 1 is a perspective view of sunglasses including an optical sheet (first embodiment) of the present invention. FIG. 2 is a perspective view of a sun visor including the optical sheet (first embodiment) of the present invention. FIG. 5 is a cross-sectional view of the optical component shown in FIG. FIG. 7 is a graph showing the optical spectrum of the light absorption layer (specific wavelength absorption layer) included in the optical sheet shown in FIG.

Note that in FIGS. 1, 2, and 5 (the same applies to FIG. 6), the upper side is also referred to as "upper" or "upper", and the lower side is also referred to as "lower" or "lower". Further, in the drawings referred to in this specification, the dimensions in the thickness direction are exaggerated and are greatly different from the actual dimensions.

The optical sheet 1 of the present invention shown in FIGS. 1, 2, and 5 is made of a material containing a resin and at least one kind of light absorber, and absorbs light in a specific wavelength range in the visible light range. The specific wavelength absorption layer 11 (light absorption layer) includes a first peak Pa having an absorption peak wavelength P1 between 480 nm and 580 nm and between 600 nm and 700 nm in the light absorption spectrum. and a second peak Pb having a peak wavelength P2 of absorption, and the light transmittance at the peak wavelength P1 is T1 [%], and the light transmittance at the peak wavelength P2 is T2 [%], When the half-width at the peak wavelength P1 is W1 [nm] and the half-width at the second peak wavelength is W2 [nm], the relationship T1>T2 is satisfied and the relationship W2>W1 is satisfied.

This allows the user to reliably emphasize blue light (light with a wavelength range of approximately 430 nm or more and 470 nm or less) and to identify colors other than blue. If T1≦T2, the transmittance of light in the range of 480 nm to 580 nm may be too low to accurately identify light in the range of 480 nm to 580 nm, or the transmittance of light in the range of 600 nm to 700 nm may be too low. If it is too high, there is a possibility that the effect of enhancing blue light cannot be sufficiently obtained.

Furthermore, if W2≦W1, blue light is also absorbed, making it impossible to emphasize blue, and yellow light is also absorbed, making the color too blue to distinguish other colors.

By satisfying the above conditions, the color of the optical sheet 1 (optical component 10) can be toned to blue, which is as close as possible to gray, which is the standard color of sunglasses. By toning the color to a blue that is as close to gray as possible, you can emphasize only the colors you want to emphasize, while leaving other colors to appear natural. Specifically, hue a (hereinafter simply referred to as "a value") measured at a viewing angle of 2 degrees using a C light source is -2 or more and 6 or less, and hue b (hereinafter simply referred to as "b value") It can be toned to a blue color with -14 or more and -6 or less.

The a value is preferably -2 or more and 6 or less, more preferably -2 or more and 4 or less, and even more preferably -2 or more and 2 or less. The b value is preferably -14 or more and -6 or less, more preferably -12 or more and -6 or less, and even more preferably -10 or more and -6 or less.

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. 2.

As shown in FIG. 1, the sunglasses (optical component 10) include a frame 2 that is mounted on a user's head, and a lens 3 with an optical sheet (optical component) fixed to the frame 2. Note that 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 attached to the user's head and includes a rim portion 21, a bridge portion 22, a temple portion 23 that is hung on the user's ear, and a nose pad portion 24. have. Each rim portion 21 has a ring shape, and is a portion on the inside of which the lens 3 with an optical sheet is attached.

The bridge portion 22 is a portion that connects each rim portion 21. The temple portion 23 has a temple shape and is connected to the edge of each rim portion 21. This temple part 23 is a part that is hung on the user's ear. The nose pad portion 24 is a portion that comes into contact with the user's nose when the sunglasses (optical component 10) are worn on the user's head. Thereby, the attached 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 mounted on the user's head.

The optical component of the present invention includes 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 in the wearing state). Thereby, the optical sheet 1 can function as sunglasses while enjoying the advantages of the optical sheet 1 described above.

As shown in FIG. 2, the sun visor (optical component 10') has a ring-shaped attachment part 5 that is attached to the user's head, and a collar 6 provided in front of the attachment part 5. There is. The collar 6 includes a light-transmitting member 7 (base material) and an optical sheet 1 provided on the upper surface of the light-transmitting member 7. Thereby, the optical sheet 1 can function as a sun visor while enjoying the advantages of the optical sheet 1 described above.

The constituent materials of the lens 4 and the light transmitting member 7 are not particularly limited as long as they have light transmittance, and include various resin materials and various glasses, but the same type of polycarbonate as the optical sheet 1 may be used. Preferably it is polycarbonate. Thereby, the adhesion between the lens 4 or the light-transmitting member 7 and the optical sheet 1 can be improved.

Hereinafter, the optical sheet 1 will be explained in detail. In addition, below, the case where it is laminated|stacked on the lens 4 (base material) is representatively demonstrated.

As shown in FIG. 5, the optical sheet 1 has a specific wavelength absorption layer 11. This specific wavelength absorption layer 11 is mainly made of polycarbonate and contains a light absorber and an ultraviolet absorber.

<Resin>
The resin is not particularly limited and includes, for example, polycarbonate, polyamide, polyvinyl chloride, polyethylene, polypropylene, etc. Among these, polycarbonate is preferred.

The polycarbonate is not particularly limited and various types can be used, but aromatic polycarbonates are particularly preferred. The aromatic polycarbonate has an aromatic ring in its main chain, which allows the optical sheet 1 to have better strength.

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) which is the origin of the repeating unit of polycarbonate shown in 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.)

In addition, specific examples of the bisphenol that is the origin of the repeating unit of the polycarbonate shown in formula (1) include, for example, 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'- Examples include bis(4-hydroxy-3-methylphenyl)propane, and one or more of these may 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 more excellent strength.

The viscosity average molecular weight Mv of such polycarbonate is preferably 20,000 or more and 30,000 or less, more preferably 23,000 or more and 28,000 or less, and even more preferably 24,000 or more and 27,500 or less.

Thereby, the strength of the optical sheet 1 can be sufficiently increased. Furthermore, the fluidity of the polycarbonate in its molten state can be sufficiently increased. Thereby, when manufacturing the optical sheet 1 by extrusion molding, for example, extrusion molding can be performed in a state where the molten polycarbonate and the light absorbent are sufficiently mixed. Therefore, it is possible to prevent the light absorbent from becoming excessively aggregated after molding. Furthermore, since the viscosity average molecular weight Mv of the polycarbonate is 20,000 or more and 30,000 or less, it has sufficient strength. As described above, the optical sheet 1 of the present invention prevents the light absorbent from agglomerating and has sufficient strength.

Further, the melt flow rate (MFR) of the polycarbonate measured in accordance with JIS K7210 is preferably 3 g/10 min or more and 30 g/10 min or less, and more preferably 15 g/10 min or more and 25 g/10 min or less. . Thereby, the fluidity of the polycarbonate can be sufficiently increased in the molten state. Therefore, for example, when manufacturing the optical sheet 1 by extrusion molding, extrusion molding can be performed in a state where the molten polycarbonate and the light absorbent are sufficiently mixed.

Further, the polycarbonate preferably has a water absorption rate of 0.02% or more and 0.2% or less, more preferably 0.04% or more and 0.15% or less. Thereby, extrusion molding can be performed in a state in which the molten polycarbonate and the light absorbent are sufficiently mixed. Therefore, excessive aggregation of the light absorbent can be prevented.

Note that the water absorption rate in this specification is a value measured using Aquatrac 3E (manufactured by Brabender).

Further, 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 more reliably exhibited.

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

The light absorber 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, but examples include quinoline dyes, anthraquinone dyes, perylene dyes, Examples include polymethine dyes, porphyrin complex dyes, and phthalocyanine dyes, among which one type or a combination of two or more types can be used.

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, 4,6,8-trimethylquinoline, 2-aminoquinoline, 3-aminoquinoline, 5-aminoquinoline, 6-aminoquinoline, 8-aminoquinoline, 6-aminoquinoline Amino group-substituted quinoline compounds such as -2-methylquinoline, alkoxy group-substituted quinoline compounds such as 6-methoxy-2-methylquinoline, 6,8-dimethoxy-4-methylquinoline, 6-chloroquinoline, 4,7-dichloro Examples include quinoline compounds substituted with halogen groups such as quinoline, 3-bromoquinoline, and 7-chloro-2-methylquinoline.

By blending such a quinoline dye, among the light incident on the specific wavelength absorption layer 11, light having a wavelength range of 350 nm or more and 550 nm or less can be absorbed. Note that it is preferable that the absorption peak be 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-tertiarybutylanilino)-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-tertiarybutylanilino)-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- Examples include 3-fluoroanthraquinone, (52) 2,3-bis(phenylthio)-1-phenoxy-4-fluoroanthraquinone, (53) 1,2,3,4-tetra(p-methoxyphenoxy)-anthraquinone, etc. .

By blending such an anthraquinone dye, it is possible to absorb light having a wavelength of 450 nm or more and 600 nm or less among the light incident on the specific wavelength absorption layer 11. Note that it is preferable that the absorption peak be in a wavelength range of 500 nm or more and 600 nm or less.

Examples of perylene dyes include N,N'-dimethylperylene-3,4,9,10-tetracarboxylic acid diimide, N,N'-diethylperylene-3,4,9,10-tetracarboxylic acid diimide , N,N'-bis(4-methoxyphenyl)-perylene-3,4,9,10-tetracarboxylic acid diimide, N,N'-bis(4-ethoxyphenyl)-perylene-3,4,9, Examples include 10-tetracarboxylic acid diimide, N,N'-bis(4-chlorophenyl)-perylene-3,4,9,10-tetracarboxylic acid diimide, and particularly preferred ones include N,N'-bis(4-chlorophenyl)-perylene-3,4,9,10-tetracarboxylic acid diimide. Examples include (3,5-dimethylphenyl)-perylene-3,4,9,10-tetracarboxylic acid diimide.

By blending such a perylene dye, it is possible to absorb light having a wavelength of 400 nm or more and 800 nm or less among the light incident on the specific wavelength absorption layer 11. Note that it is preferable that the absorption peak be in a wavelength range of 600 nm or more and 780 nm or less.

Examples of polymethine dyes include streptocyanine, open chain cyanine, hemicyanine, closed cyanine, and merocyanine.

By blending such a polymethine dye, it is possible to absorb light having a wavelength of 400 nm or more and 700 nm or less among the light incident on the specific wavelength absorption layer 11. Note that it is preferable that the absorption peak be in a wavelength range of 450 nm or more and 550 nm or less.

Examples of porphyrin dyes include tetraazaporphyrin metal complexes, tetraarylporphyrins, octaethylporphyrins, and the like.

By blending such a porphyrin complex dye, among the light incident on the specific wavelength absorption layer 11, light having a wavelength of 500 nm or more and 700 nm or less can be absorbed. Note that it is preferable that the absorption peak be in a wavelength range of 550 nm or more and 600 nm or less.

Examples of the phthalocyanine dye 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 having a wavelength of 550 nm or more and 750 nm or less among the light incident on the specific wavelength absorption layer 11. Note that it is preferable that the absorption peak be in a wavelength range of 550 nm or more and 600 nm or less.

By blending the above-mentioned light absorbers, light in a specific wavelength range can be absorbed. Therefore, for example, the user can clearly recognize the contours of objects and people when wearing the device, and safety can be improved.

The content of the light absorber (total of each light absorber) 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 effects can be more reliably achieved. If the content is too low, the effect as a light absorbing agent may not be sufficiently obtained. On the other hand, if the content is too large, the light absorbent tends to aggregate easily.

Further, the basis weight of the light absorbent (total of each light absorbent) 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 less. More preferably, it is ² or less. Thereby, the effects of the present invention can be more reliably exhibited.

<Ultraviolet absorber>
The ultraviolet absorber absorbs ultraviolet light (light having a wavelength range of 100 nm or more and 420 nm or less). Thereby, it is possible to reduce the irradiation of ultraviolet rays into the user's eyes and protect the user's eyes. Furthermore, it is possible to prevent the light absorbent from deteriorating due to 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 compounds, benzophenone compounds, benzotriazole compounds, and cyanoacrylate compounds, and one type or a combination of two or more of these can be used. Among these, triazine compounds are particularly preferably used. Thereby, deterioration of the specific wavelength absorption layer 11 (polycarbonate and light absorbent) due to ultraviolet rays can be prevented or suppressed, and the weather resistance of the optical sheet 1 can be improved.

Examples of triazine compounds include 2-mono(hydroxyphenyl)-1,3,5-triazine compounds, 2,4-bis(hydroxyphenyl)-1,3,5-triazine compounds, and 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- Examples include ethoxyhexyloxy)-1-oxopropan-2-yloxy)phenyl)-1,3,5-triazine. Further, commercially available triazine-based ultraviolet absorbers include, for example, "Tinuvin 1577", "Tinuvin 460", "Tinuvin 477" (manufactured by BASF Japan), "ADEKA STAB LA-F70" (manufactured by ADEKA), and the like.

The specific wavelength absorption layer 11 further includes 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 among the light incident on the specific wavelength absorption layer 11, the wavelength is 100 nm or more and 420 nm or less. can absorb light. Thereby, deterioration of the specific wavelength absorption layer 11 (polycarbonate and light absorbent) due to ultraviolet rays can be prevented or suppressed, and the weather resistance of the optical sheet 1 can be improved.

The content of the ultraviolet absorber in the specific wavelength absorption layer 11 is preferably 0.05 wt% or more and 8 wt% or less, more preferably 0.07 wt% or more and 6 wt% or less. Thereby, the above effects can be more reliably achieved. If the content is too low, there is a risk that the effect as an ultraviolet absorber may not be sufficiently obtained. On the other hand, if the content is too large, the ultraviolet absorber tends to aggregate easily.

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

The thickness of such specific wavelength absorption layer 11 is not particularly limited, but 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. This makes it possible to improve the ease of handling and prevent the optical component as a whole from becoming unnecessarily thick.

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

Moreover, when the melting point of polycarbonate is t1 and the melting point of the light absorbent is t2, it is preferable that T1<T2 be satisfied. Thereby, when the molten polycarbonate and the light absorbent are mixed, it is possible to prevent the light absorbent from being altered or discolored by heat.

Moreover, when the melting point of polycarbonate is t1 and the melting point of the ultraviolet absorber is t3, it is preferable that T1<T3 be satisfied. Thereby, when the molten polycarbonate and the ultraviolet absorber are mixed, it is possible to prevent the ultraviolet absorber from being altered or discolored by heat.

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

The melting point t2 of the light absorbent is preferably 300°C or more and 400°C or less, more preferably 330°C or more and 360°C or less. Further, the melting point t3 of the ultraviolet absorber is preferably 310°C or more and 370°C or less, more preferably 340°C or more and 360°C or less. By setting the melting point t1 to t3 within the above numerical range, the above effects can be more reliably exhibited.

Note that the specific wavelength absorption layer 11 may contain a dye different from the dyes mentioned above. The pigment is not particularly limited, but includes, for example, pigments, dyes, etc., and these can be used alone or in combination.

Pigments include, but are not particularly limited to, phthalocyanine pigments such as phthalocyanine green and phthalocyanine blue, fast yellow, disazo yellow, condensed azo yellow, penzimidazolone yellow, dinitroaniline orange, penzimidazolone orange, toluidine red, Azo pigments such as permanent carmine, permanent red, naphthol red, condensed azo red, benzimidazolone carmine, and benzimidazolone brown; anthraquinone pigments such as anthrapyrimidine yellow and anthraquinonyl red; azomethine pigments such as copper azomethine yellow; Quinophthalone pigments such as quinophthalone yellow, isoindoline pigments such as isoindoline yellow, nitroso pigments such as nickel dioxime yellow, perinone pigments such as perinone orange, quinacridone magenta, quinacridone maroon, quinacridone scarlet, quinacridone red, etc. Organic pigments such as quinacridone pigments, perylene pigments such as perylene red and perylene maroon, pyrrolopyrrole pigments such as diketopyrrolopyrrole red, dioxazine pigments such as dioxazine violet, carbon black, lamp black, furnace black, Carbon pigments such as ivory black, graphite, fullerene, chromate pigments such as yellow lead and molybdate orange, cadmium yellow, cadmium lithopone yellow, cadmium orange, cadmium lithopone orange, silver vermilion, cadmium red, cadmium lithopone Red, sulfide pigments such as sulfide, ocher, titanium yellow, titanium barium nickel yellow, red lead, amber, brown iron oxide, zinc iron chrome brown, chromium oxide, cobalt green, cobalt chrome green, titanium cobalt green, Oxide pigments such as cobalt blue, cerulean blue, cobalt aluminum chrome blue, iron black, manganese ferrite black, cobalt ferrite black, copper chrome black, copper chrome manganese black, hydroxide pigments such as viridian, and ferrites such as navy blue. These include russianide pigments, silicate pigments such as ultramarine blue, phosphate pigments such as cobalt violet and mineral violet, and other inorganic pigments such as cadmium sulfide and cadmium selenide. One type or a combination of two or more types can be used.

Examples of dyes include, but are not limited to, metal complex dyes, cyan dyes, xanthene dyes, azo dyes, hibiscus dyes, blackberry dyes, raspberry dyes, pomegranate juice dyes, chlorophyll dyes, and tetraazoporphyrin compounds. Examples include porphyrin compounds, and one or more of these can be used in combination.

Now, optical sheet 1 can absorb light in a specific wavelength range by blending the light absorbing agent as described above, and the user can clearly recognize the outline of objects and people when wearing it. This can improve safety.

Furthermore, by adjusting the wavelength range of light absorbed by the light absorber, it is possible to emphasize light of a predetermined color to the user. In particular, by emphasizing blue light (light in the wavelength range of 430 nm to 470 nm) to the user, light in the vicinity of 580 nm is selectively transmitted, maintaining bright vision even when driving at night. be able to.

Conventionally, blue light is emphasized by simply adding a light absorbing agent that absorbs light in a wavelength range other than blue light. However, if there are too many light absorbers that absorb light in wavelength ranges other than blue light, the transmittance of light in wavelength ranges other than blue light may be too low, and blue light may be overemphasized. . As a result, color discrimination may become difficult. Furthermore, if the amount of light absorbing agent that absorbs light in a wavelength range other than blue light is too small, the effect of enhancing blue light may not be sufficiently obtained.

Therefore, the inventors of the present invention have conducted extensive studies and found that the specific wavelength absorption layer 11 having the following configuration is effective in solving the above problem, and in order to complete the present invention. It's arrived. This will be explained below.

FIG. 7 is a graph showing a light absorption spectrum of the specific wavelength absorption layer 11 (light absorption layer), with the horizontal axis representing wavelength [nm] and the vertical axis representing transmittance [%]. It is assumed that the transmittance on the vertical axis has a correlation with the light absorption rate; the higher the light absorption rate, the lower the transmittance; and the lower the light absorption rate, the higher the transmittance.

As shown in FIG. 7, the light absorption spectrum of the specific wavelength absorption layer 11 is represented by a curve having a first peak Pa and a second peak Pb.

The first peak Pa has an absorption peak wavelength P1 between 480 nm and 580 nm. The second peak Pb has an absorption peak wavelength P2 between 600 nm and 700 nm.

Further, the light transmittance T1 [%] at the peak wavelength P1 and the light transmittance T2 [%] at the peak wavelength P2 satisfy the relationship T1>T2.

The half-width W1 [nm] at the first peak Pa and the half-width W2 [nm] at the second peak Pb satisfy the relationship W2>W1.

Note that the half width at the first peak Pa is defined as follows. First, the absorbance is measured outward from the peak wavelength P1 in 2 nm increments on both sides of the peak wavelength P1, and the first two wavelengths at which the change in absorbance becomes 0.005 or less are detected, and these two wavelengths are detected. The wavelength with higher transmittance is defined as the bottom wavelength. Then, the width of the first peak Pa when the value is half the difference between the transmittance at the bottom wavelength and the transmittance at the peak wavelength P1 is defined as the half-width at the first peak Pa.

The half width at the second peak Pb is defined as follows in the same way as above. First, the absorbance is measured outward from the peak wavelength P2 in 2 nm increments on both sides of the peak wavelength P2, and the first two wavelengths at which the change in transmittance is 0.005 or less are detected, and these two wavelengths are detected. The wavelength with higher absorbance is defined as the bottom wavelength. Then, the width of the second peak Pb when the value is half the difference between the transmittance at the bottom wavelength and the transmittance at the peak wavelength P2 is defined as the half-width at the second peak Pb.

With such a configuration, it is possible to reliably emphasize blue light to the user, and it is also possible to identify colors other than blue. As a result, when driving a car, even when the sodium lamps inside the tunnel have a yellowish tinge, the tones of objects can be reproduced naturally. In addition, the high-contrast effect emphasizes the blue color, and the colors are not extremely blue, so the colors of objects look natural even in daylight.

If the peak wavelength P1 is too short, it will be difficult to emphasize blue. On the other hand, if the peak wavelength P1 is too long, it becomes difficult to distinguish colors other than blue.

If the peak wavelength P2 is too short, it will be difficult to distinguish colors other than blue. On the other hand, if the peak wavelength P2 is too long, it becomes difficult to emphasize blue.

If T1≦T2, the transmittance of light between 480 nm and 580 nm may be too low to accurately identify light between 480 nm and 580 nm, and the transmittance of light between 630 nm and 730 nm may be too low. If it is too high, there is a possibility that the effect of enhancing blue light cannot be sufficiently obtained.

Furthermore, when W2≦W1, it becomes difficult to distinguish light other than blue.
Further, the light transmittance T1 at the peak wavelength P1 is preferably 10% or more and 50% or less, more preferably 20% or more and 40% or less. Thereby, the effects of the present invention can be obtained more markedly.

Further, the light transmittance T2 at the peak wavelength P2 is preferably 0% or more and 20% or less, and more preferably 3% or more and 15% or less. Thereby, the effects of the present invention can be obtained more markedly.

Further, the half width W1 [nm] is preferably 20 nm or more and 120 nm or less, and more preferably 40 nm or more and 100 nm or less. Thereby, the effects of the present invention can be obtained more markedly.

Further, the half width W2 [nm] is preferably 30 nm or more and 150 nm or less, and more preferably 50 nm or more and 130 nm or less. Thereby, the effects of the present invention can be obtained more markedly.

The light absorption spectrum as explained above can be obtained by adjusting the type and content of the light absorbent, for example.

When the light absorbent that contributes to the formation of the first peak Pa is the first light absorbent and the second light absorbent, and the light absorbent that contributes to the formation of the second peak Pb is the third light absorbent, the first The light absorber, the second light absorber, and the third light absorber are each at least one of the aforementioned quinoline dyes, anthraquinone dyes, perylene dyes, cyanine dyes, porphyrin complex dyes, and phthalocyanine dyes. , these preferred combinations are as follows.

Further, the content of the first light absorbent in the specific wavelength absorption layer 11 is 0.0001 wt% or more and 1 wt% or less, and the content of the second light absorbent in the specific wavelength absorption layer 11 is 0.0001 wt% or more. % or more and 1 wt% or less. Thereby, the specific wavelength absorption layer 11 having the light absorption spectrum as described above can be obtained.

Moreover, it is preferable that the first light absorbent and the second light absorbent are merocyanine dyes, and the third light absorbent is a phthalocyanine complex.

The ratio A/B of the content A of the first light absorber in the specific wavelength absorption layer 11 and the content B of the second light absorbent in the specific wavelength absorption layer 11 is 0.2 or more and 5 or less. It is preferably 0.3 or more and 2 or less.

Further, in this case, the ratio A/B between the content A of the first light absorber in the specific wavelength absorption layer 11 and the content B of the third light absorbent in the specific wavelength absorption layer 11 is 0.005. It is preferably 0.5 or less, and more preferably 0.01 or more and 0.2 or less. Thereby, the specific wavelength absorption layer 11 can have a light absorption spectrum as explained above.

(Method for manufacturing optical sheet)
First, the optical sheet manufacturing apparatus used in this manufacturing method will be explained.

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

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

In this embodiment, the sheet supply section 200 includes an extruder 210 and a T-die 220 connected to a molten resin discharge section of the extruder 210 via piping. The T-die 220 supplies the belt-shaped sheet 1' in a molten or softened state to the sheet forming section 300.

The T-die 220 is an extrusion molding section that extrudes the molten or softened sheet 1' into a band-shaped sheet using an extrusion method. The T-die 220 is loaded with the above-mentioned constituent material constituting the optical sheet 1 in a molten state, and by extruding this molten material from the T-die 220, a belt-shaped sheet 1' is continuously fed out. It will be done.

The sheet forming section 300 includes a touch roll 310, a cooling roll 320, and a rear cooling roll 330. These rolls are configured to be rotated independently by motors (driving means) not shown, and are cooled by the rotation of these rolls so that the rolls are continuously fed out. By continuously feeding the sheet 1' into the sheet forming 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 this cooled sheet 1' into a predetermined length.

The optical sheet of this embodiment is manufactured by the optical sheet manufacturing method using the optical sheet manufacturing apparatus 100 as described above.
Manufacturing of an optical sheet includes an extrusion process, a molding process, and a cooling process.

First, a belt-shaped sheet 1' in a molten or softened state is extruded (extrusion step). In this extrusion step, the extruder 210 is loaded with the constituent materials (polycarbonate, light absorber, ultraviolet absorber, etc.) of the optical sheet 1. Further, the constituent materials of the optical sheet 1 are in a melted or softened state in the extruder 210. Here, as described above, in the present invention, since the polycarbonate has a viscosity average molecular weight Mv of 20,000 to 30,000, the polycarbonate, the light absorber, and the ultraviolet absorber are sufficiently mixed. By extruding them in this sufficiently mixed state, the optical sheet 1 obtained through the molding process and cooling process described later prevents the light absorbent, ultraviolet absorbent, etc. from agglomerating excessively. can do.

Next, the surface of the sheet 1' is flattened and the sheet 1' is set to a predetermined thickness (molding 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 latter stage cooling roll 330.

Through the above steps, the optical sheet 1 can be obtained. Next, a method for manufacturing the optical component will be explained.

(Manufacturing method of optical components)
First, the optical component manufacturing apparatus used in this manufacturing method will be explained.

The optical component manufacturing apparatus 400 shown in FIG. 4 includes a resin supply section 500 and a mold 600. The resin supply section 500 is filled with the above-mentioned polycarbonate. The mold 600 has a cavity 610 and a supply port 620 that communicates 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 in an assembled state in which these are assembled, the mold 600 that defines the optical component manufacturing apparatus 400 is configured.

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 method for manufacturing an optical component includes an optical sheet arrangement step and a lens material supply step.

First, in a state where the upper member 630 and the lower member 640 are 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. Further, since the optical sheet 1 has flexibility, it is arranged to follow the shape of the bottom surface 641.

Next, the upper member 630 and the lower member 640 are brought into an assembled state, and a molten or softened lens material is poured in 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 lens are laminated can be obtained.

Note that although the so-called sheet insert method has been described as an example, the present invention is not limited to this, and for example, a structure in which the optical sheet 1 is laminated on a molded lens via an adhesive may also be used. good.

<Second embodiment>
FIG. 6 is a sectional view of an optical component including the optical sheet (second embodiment) of the present invention.

Hereinafter, a second embodiment of the optical sheet and optical component of the present invention will be described with reference to this figure, but the explanation will focus on the differences from the embodiments described above, and the explanation of similar matters will be omitted.
This embodiment is the same as the first embodiment except that it includes a polarizing film.

(polarizing film)
As shown in FIG. 6, the optical sheet 1A further includes a polarizing film 12 and an adhesive layer 13. The polarizing film 12 is laminated on the specific wavelength absorption layer 11 via an adhesive layer 13. In the illustrated configuration, the polarizing film 12 is placed on the lens 4 side.

The polarizing film 12 has a function of extracting linearly polarized light having a plane of polarization in one predetermined direction from incident light (unpolarized natural light). Thereby, the incident light that enters the eye via the optical sheet 1 becomes polarized.

The degree of polarization of the polarizing film 12 is not particularly limited, but is preferably, for example, 50% or more and 100% or less, more preferably 80% or more and 100% or less. Further, the visible light transmittance of the polarizing film 12 is not particularly limited, but is preferably, for example, 10% or more and 80% or less, and more preferably 20% or more and 50% or less.

The constituent material of such a polarizing film 12 is not particularly limited as long as it has the above-mentioned functions, but examples thereof include polyvinyl alcohol (PVA), partially formalized polyvinyl alcohol, polyethylene vinyl alcohol, polyvinyl butyral, polycarbonate, and ethylene-vinyl alcohol. A polymer film composed of partially saponified vinyl acetate copolymer, etc., is dyed by adsorbing a dichroic substance such as iodine or a dichroic dye, and then uniaxially stretched, a dehydrated product of polyvinyl alcohol, or a polyvinyl alcohol film. Examples include polyene-based oriented films such as vinyl chloride treated with dehydrochloric acid.

Among these, the polarizing film 12 is preferably a polymer film mainly made of polyvinyl alcohol (PVA), which is dyed by adsorbing iodine or a dichroic dye, and then uniaxially stretched. Polyvinyl alcohol (PVA) is a material that is excellent in transparency, heat resistance, affinity with iodine or dichroic dyes as dyeing agents, and orientation during stretching. Therefore, the polarizing film 12 mainly made of PVA has excellent heat resistance and polarizing function.

The dichroic dyes include, for example, chloratin fast red, Congo red, brilliant blue 6B, benzopurpurin, chlorazole black BH, direct blue 2B, diamine green, chrysophenone, sirius yellow, direct fast red, and acid black. Examples include.

The thickness of the polarizing film 12 is not particularly limited, and is preferably, for example, 5 μm or more and 60 μm or less, more preferably 10 μm or more and 40 μm or less.

The adhesive (or pressure-sensitive adhesive) constituting the adhesive layer 13 is not particularly limited, and examples thereof include acrylic adhesives, urethane adhesives, epoxy adhesives, silicone adhesives, and the like.

Among these, urethane adhesives are preferred. Thereby, the transparency, adhesive strength, and durability of the adhesive layer 13 can be improved, and the ability to follow changes in shape can be particularly improved.

This embodiment also provides the same effects as the first embodiment, and also has a polarizing function.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to those described above, and modifications, improvements, etc. are included in the present invention within the scope of achieving the purpose of the present invention. It is.

For example, each part constituting the optical sheet of the present invention can be replaced with any part that can perform the same function.

Moreover, in addition to the above-mentioned structure, the optical sheet of the present invention may have an arbitrary structure added thereto.

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

Hereinafter, the present invention will be explained more specifically based on Examples.
1. Consideration of optical sheets 1-1. Creation of optical sheet [Example 1]
[1] First, 100 parts by mass of bisphenol A polycarbonate (manufactured by Mitsubishi Gas Chemical Co., Ltd., "Iupilon E2000F E5111") and 0.001 parts by mass of (manufactured by Yamada Chemical Co., Ltd., "FDG") as a first light absorber. -001''), 0.0006 parts by mass of a light absorber (manufactured by Yamada Chemical Co., Ltd., "FDG-002") as a second light absorber, and 0.012 parts by mass of light as a third light absorber. An optical sheet is formed by stirring and mixing an absorbent (manufactured by Yamada Chemical Co., Ltd., "FDR-002") and 0.4 parts by mass of an ultraviolet absorber (manufactured by Adeka Corporation, "Adeka Stab LA-31G"). Prepared the materials.

[2] Next, the optical sheet forming material was stored in the extruder 210 of the optical sheet manufacturing apparatus 100 shown in FIG. 3, melted, and extruded from the T-die 220 to obtain a sheet material. Then, the sheet material was cooled and molded in the sheet molding section 300, and cut into a rectangular shape with an average thickness of 0.3 mm and a size of 500 mm x 500 mm in plan view to create an optical sheet having a specific wavelength absorption layer.

In addition, in the light absorption spectrum of the obtained specific wavelength absorption layer, the peak wavelength P1 was 526 nm, and the peak wavelength P2 was 684 nm.

As a result of measuring the obtained sheet with V670 (manufactured by JASCO Corporation), the hue a value at a C light source viewing angle of 2 degrees was +1.8, and the hue b value was -9.8.

In addition, in the light absorption spectrum of the obtained specific wavelength absorption layer, the light transmittance T1 [%] at the peak wavelength P1 and the light transmittance T2 [%] at the peak wavelength P2 are T1>T2. In addition, the half-width W1 [nm] at the first peak and the half-width W2 [nm] at the second peak satisfied the relationship W2>W1.

In addition, the viscosity average molecular weight Mv of the polycarbonate is 27,000, the melting point t1 is 250°C, the melt flow rate measured in accordance with JIS K7210 is 5.3 g/10 min, and the polycarbonate is The water absorption rate measured by Lavender Co., Ltd.) was 0.05%.

[Example 2]
An optical sheet of Example 2 was obtained in the same manner as in Example 1 except that the structure of the optical sheet was changed as shown in Table 1.

[Example 3]
An optical sheet of Example 3 was obtained in the same manner as in Example 1 except that the structure of the optical sheet was changed as shown in Table 1.

[Example 4]
An optical sheet of Example 4 was obtained in the same manner as in Example 1 except that the structure of the optical sheet was changed as shown in Table 1.

[Example 5]
An optical sheet of Example 5 was obtained in the same manner as in Example 1 except that the structure of the optical sheet was changed as shown in Table 1.

[Example 6]
An optical sheet of Example 6 was obtained in the same manner as in Example 1 except that the structure of the optical sheet was changed as shown in Table 1.

[Example 7]
An optical sheet of Example 7 was obtained in the same manner as in Example 1 except that the structure of the optical sheet was changed as shown in Table 1.

[Example 8]
An optical sheet of Example 8 was obtained in the same manner as in Example 1 except that the structure of the optical sheet was changed as shown in Table 1.

[Comparative example A]
An optical sheet of Comparative Example A was obtained in the same manner as in Example 1 except that the structure of the optical sheet was changed as shown in Table 1.

[Comparative example B]
An optical sheet of Comparative Example B was obtained in the same manner as in Example 1 except that the structure of the optical sheet was changed as shown in Table 1.

[Comparative example C]
An optical sheet of Comparative Example C was obtained in the same manner as in Example 1 except that the structure of the optical sheet was changed as shown in Table 1.

In Table 1, a1 indicates polycarbonate (manufactured by Mitsubishi Gas Chemical Co., Ltd., "E2000FN E5100"), a2 indicates polycarbonate (manufactured by Mitsubishi Gas Chemical Co., Ltd., "H3000"), and a3 indicates polycarbonate (manufactured by Sumitomo Gas Chemical Co., Ltd., "H3000"). A4 indicates polycarbonate ("S2000", manufactured by Mitsubishi Gas Chemical Co., Ltd.), and a5 indicates polycarbonate ("1300-03", manufactured by EG Corporation).

In addition, in Table 1, b1 indicates (manufactured by Yamada Chemical Co., Ltd., "FDG-001"), b2 indicates (manufactured by Yamada Chemical Co., Ltd., "FDG-002"), and b3 indicates ( b4 indicates (Yamada Chemical Co., Ltd., "FDB-006"), b5 indicates (Yamada Chemical Co., Ltd., "FDR-002"), b5 indicates (Yamada Chemical Co., Ltd., "FDR-006"), b6 indicates (manufactured by Yamada Chemical Co., Ltd., "FDB-004"), and b7 indicates (manufactured by Yamada Chemical Co., Ltd., "FDR-005").

Further, in Table 1, c indicates an ultraviolet absorber (manufactured by Adeka Corporation, "Adeka Stab LA-31G").

1-2. Evaluation The optical sheets of each Example and each Comparative Example were evaluated by the following method.
(Blue emphasis evaluation)
A photograph of the blue object was taken through the optical sheet manufactured as described above, and each of the photographs was examined by 10 people to see if it had a blue-enhancing effect.

A: It is effective for 10 out of 10 people.
B: Effective in 6 to 9 out of 10 people.
C: Effective for 2 to 5 out of 10 people.
D: Effective for 1 out of 10 people.

(cohesion evaluation)
Observation was performed using a digital microscope (manufactured by Keyence Corporation, "VHX-1000"), the size of the aggregate was measured, and the evaluation was made as follows.

A: The size of aggregates is less than 0.05 ^mm2 .
B: The size of the aggregate is 0.05 mm ² or more and 0.1 mm ² or more.
C: Size of aggregates is 0.1 mm ² or more and less than 0.5 mm ² .
D: The size of the aggregate is 0.5 mm ² or more.

(Strength evaluation)
Charpy impact strength was measured in accordance with ISO 179-1 and ISO 179-2, and evaluated as follows.

A: 80KJ/ ^m2 or more.
B: 50KJ/ ^m2 or more and less than 80KJ/ ^m2 .
C: 25KJ/ ^m2 or more and less than 50KJ/ ^m2 .
D: Less than 25KJ/ ^m2 .

(Weather resistance evaluation)
Irradiation with a xenon lamp (7.5 kW, output: 1.728 MJ/m ² ) (light source filter: daylight filter, irradiance: broadband (300-400 nm), 60 ± 2 W/m ² ) for 8 hours caused yellowing. The degree (ΔYI) was evaluated as follows.

A: ΔYI is less than 1.0 and there is no change in appearance.
B: A slight change in appearance is observed when ΔYI is 1.0 or more and less than 2.0.
C: Appearance changes are observed when ΔYI is 2.0 or more and less than 3.0.
D: Significant change in appearance is observed when ΔYI is 3.0 or more.

(Color distinguishability evaluation)
A photograph of the object was taken through the optical sheet manufactured as described above, and each of the 10 people was asked to confirm whether they could correctly identify the color of the object.

A: 10 out of 10 people were able to identify it.
B: 6 to 9 out of 10 people were able to identify.
C: 2 to 5 out of 10 people were able to identify.
D: 1 out of 10 people was able to identify it.

The evaluation results for the optical sheets of each Example and each Comparative Example obtained as described above are shown in Table 1 below.

As shown in Table 1, the optical sheets in each Example were able to emphasize blue more than in each Comparative Example, and the results were satisfactory for each Comparative Example.

1 Optical sheet 1' Sheet 1A Optical sheet 2 Frame 3 Lens with optical sheet 4 Lens 5 Mounting part 6 Collar 7 Light transmitting member 10 Optical component 10' Optical component 11 Specific wavelength absorption layer 12 Polarizing film 13 Adhesive layer 21 Rim part 22 Bridge section 23 Temple section 24 Nose pad section 100 Optical sheet manufacturing device 200 Sheet supply section 210 Extruder 220 T-die 300 Sheet forming section 310 Touch roll 320 Cooling roll 330 Post-stage cooling roll 400 Optical component manufacturing device 500 Resin supply section 600 Gold Mold 610 Cavity 620 Supply port 630 Upper member 640 Lower member 641 Bottom surface P1 Peak wavelength P2 Peak wavelength Pa First peak Pb Second peak T1 Transmittance T2 Transmittance

Claims (11)

Comprised of a material containing a resin and at least one kind of light absorber, comprising a light absorption layer that absorbs light in a specific wavelength range in the visible light range,
The light absorption layer has, in a light absorption spectrum, a first peak having an absorption peak wavelength P1 between 480 nm and 580 nm, and a second peak having an absorption peak wavelength P2 between 600 nm and 700 nm. , and
The light transmittance at the peak wavelength P1 is T1 [%], the light transmittance at the peak wavelength P2 is T2 [%], the half width at the peak wavelength P1 is W1 [nm], and the peak wavelength P2 is When the half-width at W2 [nm],
satisfies the relationship T1>T2 and satisfies the relationship W2>W1,
The light absorber includes a first light absorber and a second light absorber that contribute to the formation of the first peak, and a third light absorber that contributes to the formation of the second peak,
The peak wavelength of the absorption rate of the first light absorbent is smaller than the peak wavelength of the absorption rate of the second light absorbent,
The content of the first light absorber in the light absorption layer is A, the content of the second light absorber in the light absorption layer is B, and the content of the third light absorber in the light absorption layer. An optical sheet characterized in that, when the amount is C, A/B is 0.3 or more and 2 or less, and A/C is 0.01 or more and 0.2 or less . The T1 is 10% or more and 50% or less,
The optical sheet according to claim 1, wherein the T2 is 0% or more and 20% or less. The W1 is 20 nm or more and 120 nm or less,
The optical sheet according to claim 1 or 2, wherein the W2 is 30 nm or more and 150 nm or less. The first light absorber, the second light absorber, and the third light absorber are at least one of a quinoline dye, a cyanine dye, a perylene dye, an anthraquinone dye, a porphyrin complex dye, and a phthalocyanine dye. The optical sheet according to any one of claims 1 to 3. The content of the first light absorber in the light absorption layer is 0.0001 wt% or more and 1 wt% or less, and the content of the second light absorber in the light absorption layer is 0.0001 wt% or more. The optical sheet according to any one of claims 1 to 4, wherein the content is 1 wt% or less. The optical sheet according to any one of claims 1 to 5, wherein the resin is mainly polycarbonate. The optical sheet according to claim 6, wherein the polycarbonate has a viscosity average molecular weight Mv of 20,000 or more and 30,000 or less. The optical sheet according to any one of claims 1 to 7, wherein the light absorption layer contains a deterioration inhibitor that prevents deterioration of the light absorption agent. Any one of claims 1 to 8, wherein the light absorption layer has a hue a value of -2 or more and 6 or less, and a hue b value of -14 or more and -6 or less when measured using a C light source at a viewing angle of 2°. The optical sheet according to item 1. The optical sheet according to any one of claims 1 to 9, further comprising a polarizing layer laminated on the light absorption layer and having a polarizing function. base material and
An optical component comprising: the optical sheet according to any one of claims 1 to 10, which is laminated on the base material.

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