JP7107348B2 - Optical sheets and optical components - Google Patents

Description

The present invention relates to optical sheets and optical components.

For example, there is known an optical sheet that absorbs a specific wavelength range from incident light for the purpose of increasing the contrast of the field of view or preventing glare (see, for example, 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 resin material and a dye (light absorber) contained in the resin material that absorbs light of a specific wavelength in the visible light region. For example, as a result, the light transmitted through the optical sheet is emphasized in wavelength regions other than the light absorbed by the dye, and the contrast of the field of view can be enhanced.

However, if the optical sheet simply contains a light-absorbing agent that absorbs light in a wavelength range other than the wavelength range to be emphasized, it becomes difficult to distinguish between colors, and the effect of emphasizing light of a specific wavelength is reduced. Sometimes you don't get enough. Conventionally, this point has not been sufficiently examined.

WO2014/115705

SUMMARY OF THE INVENTION 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 620 nm or more and 750 nm or less for the user and that allows the user to distinguish between colors. It is in.

Such objects are achieved by the present invention of the following (1) to (9).
(1) A light-absorbing layer made of a material containing a resin and at least one first light-absorbing agent and absorbing light in a specific wavelength range in the visible light region, and at least one second light-absorbing agent. and a polarizing layer having a polarizing function, comprising:
In the light absorption spectrum of the optical sheet,
A first peak having a transmittance transmission peak wavelength P1 in a wavelength range of 480 nm or more and 530 nm or less, a second peak having a transmittance absorption peak wavelength P2 in a wavelength range of 550 nm or more and 610 nm or less, and a wavelength of 400 nm or more and 450 nm or less. having a transmission peak wavelength P3 of transmittance in the region,
The average transmittance in the wavelength range of 630 nm or more and 780 nm or less is 70% or less, and the transmittance gradually increases toward the longer wavelength side in the wavelength range A of 630 nm or more and 700 nm or less, and the wavelength range B of 700 nm or more and 780 nm or less. At , the transmittance gradually increases toward the longer wavelength side,
An optical sheet that satisfies TA<TB, where TA is an average gradual increase in transmittance in the wavelength range A and TB is an average gradual increase in transmittance in the wavelength range B.

(2) the TA is 0.14 or more and less than 0.30;
The optical sheet according to (1) above, wherein the TB is 0.40 or more and less than 0.75.

(3) The optical sheet according to (1) or (2) above, wherein the transmittance at the transmission peak wavelength P1 is 8% or more and 40% or less.

(4) The optical sheet according to any one of (1) to (3) above, wherein the transmittance at the absorption peak wavelength P2 is 1% or more and 20% or less.

(5) The optical sheet according to (4) above, wherein the first light absorber is at least one of quinoline dyes, anthraquinone dyes, perylene dyes, polymethine dyes, porphyrin complex dyes, and phthalocyanine dyes. .

(6) The second light absorber is at least one of azo dyes, stilbene dyes, thiazole dyes, dioxazine dyes, phthalocyanine dyes, disazo dyes, trisazo dyes, and metal complex salt azo dyes. The optical sheet according to (4) above.

(7) The optical sheet according to any one of (1) to (6) above, wherein the half width at the first peak is 10 nm or more and 40 nm or less.

(8) The optical sheet according to any one of (1) to (7) above, wherein the half width at the second peak is 10 nm or more and 30 nm or less.

( 9 ) a substrate;
An optical component comprising: the optical sheet according to any one of (1) to ( 8 ) laminated on the base material.

According to the present invention, it is possible to provide an optical sheet that can reliably emphasize light in the wavelength range of 620 nm or more and 750 nm or less for the user and that allows the user to distinguish colors.

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. 2 is a graph showing the light spectrum of a light absorption layer (specific wavelength absorption layer) included in the optical sheet shown in FIG. 1. FIG.

BEST MODE FOR CARRYING OUT THE INVENTION The optical sheet and optical parts 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. FIG. 6 is a graph showing the light spectrum of the light absorption layer (specific wavelength absorption layer) included in the optical sheet shown in 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 first light absorbing agent, and absorbs light in a specific wavelength range in the visible light range. and a polarizing layer 12 containing at least one second light absorbing agent and having a polarizing function. In the light absorption spectrum of the optical sheet 1, the first peak having the transmission peak wavelength P1 of the transmittance in the wavelength range of 480 nm or more and 530 nm or less and the absorption peak wavelength P2 of the transmittance in the wavelength range of 550 nm or more and 610 nm or less. and a second peak. The average transmittance in the wavelength range of 630 nm or more and 780 nm or less is 70% or less, and in the wavelength range A of 630 nm or more and 700 nm or less, the transmittance gradually increases toward the longer wavelength side, and the wavelength of 700 nm or more and 780 nm or less. In the region B, the transmittance gradually increases toward the longer wavelength side. Satisfies TB. As a result, while the transmittance of colors in the wavelength range A, ie, yellow and orange-tinged red, is sufficiently suppressed, the transmittance of colors in the wavelength range B, ie, pure red, can be gradually increased. As a result, red can be effectively emphasized. In addition, according to the present invention, red can be clearly emphasized, so that signal visibility can be improved and autumn leaves can be enjoyed.

Note that when TA≧TB, yellow and orange-tinged red are conspicuous, and red cannot be clearly emphasized. Also, when the average transmittance in the wavelength range of 630 nm or more and 780 nm or less exceeds 70%, yellow and orange become conspicuous, and the effect of TA<TB cannot be sufficiently obtained.

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). As a result, while enjoying the advantages of the optical sheet 1 described above, it is possible to exhibit the function as sunglasses.

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, a polarizing layer 12, a protective layer 13, an adhesive layer 14, and an adhesive layer 15. As shown in FIG. In the optical sheet 1, the specific wavelength absorption layer 11, the adhesive layer 14, the polarizing layer 12, the adhesive layer 15 and the protective layer 13 are laminated in this order. Further, the optical sheet 1 is bonded to the lens 4 in such a direction that the specific wavelength absorption layer 11 is located on the lens 4 side.

The specific wavelength absorption layer 11 is mainly made of polycarbonate, and contains a light absorber (first light absorber) and an ultraviolet absorber.

<Resin>
The resin is not particularly limited, and examples thereof include polycarbonate, polyamide, polyvinyl chloride, polyethylene, polypropylene, etc. Among these, polycarbonate is preferred.

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 to use a bisphenol-type polycarbonate having a skeleton derived from bisphenol as a main component. 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 in viscosity average molecular weight Mv, 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. Thereby, 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 (first light absorber)>
A light absorber absorbs light of a specific wavelength. In this specification, the term "absorb light" means that the absorbance value at the maximum absorption wavelength of 420 nm to 780 nm in the visible light region is λ1, the value 20 nm lower than λ1 is λ2, and the value 20 nm higher wavelength is λ2. When the value is λ3, it means that the absorbance λ1/λ2 or the absorbance λ1/λ3 is 1.0 or more.

The light absorbing agent (first 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. Dyes, perylene dyes, polymethine dyes, porphyrin complex dyes, phthalocyanine dyes, etc., may be mentioned, and one or more of these may be used in combination. This makes it possible to easily reproduce a light absorption spectrum as will be described later.

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-sia noanilino)-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-dichloro anilino)-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)- and anthraquinone.

By blending such an anthraquinone-based dye, it is possible to absorb light with a wavelength 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.

Examples of perylene dyes include N,N'-dimethylperylene-3,4,9,10-tetracarboxylic diimide and 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 acid diimide, N,N'-bis(4-chlorophenyl)-perylene-3,4,9,10-tetracarboxylic acid diimide and the like, and particularly preferred is N,N'-bis (3,5-dimethylphenyl)-perylene-3,4,9,10-tetracarboxylic acid diimide and the like.

By blending such a perylene-based dye, it is possible to absorb light with a wavelength 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 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.

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

By blending such a porphyrin complex dye, it is possible to absorb light with a wavelength 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 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 -ethoxyhexyloxy)-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 cy-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).

By further including an ultraviolet absorber that absorbs light in the wavelength range of 100 nm or more and 420 nm or less as described above, the specific wavelength absorption layer 11 has a wavelength of 100 nm or more and 420 nm or less of the light incident on the specific wavelength absorption layer 11. of light can be absorbed. 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 specific wavelength absorption layer 11 may contain 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.

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, benzimidazolone orange, and toluidine red. , permanent carmine, permanent red, naphthol red, condensed azo red, benzimidazolone carmine, benzimidazolone brown, etc.; 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 nickeldioxime yellow, perinone pigments such as perinone orange, quinacridone magenta, quinacridone maroon, quinacridone scarlet, quinacridone red, etc. quinacridone pigments, 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 black, graphite, carbon pigments such as fullerene, yellow lead, chromate pigments such as molybdate orange, cadmium yellow, cadmium lithopone yellow, cadmium orange, cadmium lithopone orange, silver vermillion, cadmium red, cadmium litho Pon red, 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 blue, cerulean blue, cobalt aluminum chromium blue, iron black, manganese ferrite black, cobalt ferrite black, copper chromium black, copper chromium manganese black and other oxide pigments; Ferrocyanide-based pigments, silicate-based pigments such as ultramarine, phosphate-based pigments such as cobalt violet and mineral violet, and inorganic pigments such as others (eg, cadmium sulfide, cadmium selenide, etc.). One of or a combination of two or more of these 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, tetraazoporphyrin compounds, and the like. Porphyrin compounds and the like can be mentioned, and one or more of these can be used in combination.

(polarizing layer)
The polarizing layer 12 contains a light absorber (second light absorber) and has a function of extracting linearly polarized light having a plane of polarization in one predetermined direction from incident light (natural light that is not polarized). As a result, incident light that enters the eye through the optical sheet 1 is polarized.

Although the polarization degree of the polarizing layer 12 is not particularly limited, it is preferably 50% or more and 100% or less, and more preferably 80% or more and 100% or less. Although the visible light transmittance of the polarizing layer 12 is not particularly limited, it is preferably 10% or more and 80% or less, and more preferably 20% or more and 50% or less.

The constituent material of the polarizing layer 12 is not particularly limited as long as it has the above functions. Examples include polyvinyl alcohol (PVA), partially formalized polyvinyl alcohol, polyethylene vinyl alcohol, polyvinyl butyral, polycarbonate, ethylene- A polymer film composed of a vinyl acetate copolymer partial saponified product, etc. is adsorbed with dichroic substances such as iodine and dichroic dyes, dyed, and uniaxially stretched, dehydrated polyvinyl alcohol, and poly A polyene-based oriented film such as a dehydrochlorinated vinyl chloride can be used.

Among these, the polarizing layer 12 is preferably a polymer film made mainly of polyvinyl alcohol (PVA), dyed with a light absorbing agent, and uniaxially stretched. Polyvinyl alcohol (PVA) is a material excellent in transparency, heat resistance, affinity with light absorbents, and orientation during stretching. Therefore, the polarizing layer 12 containing PVA as the main material has excellent heat resistance and excellent polarizing function.

Examples of the light absorber (second light absorber) include azo dyes, stilbene dyes, thiazole dyes, dioxazine dyes, phthalocyanine dyes, disazo dyes, trisazo dyes, metal complex salt azo dyes, and the like. , at least one of these or a combination of more than one of them can be used. This makes it possible to easily reproduce a light absorption spectrum as will be described later.

The polarizing layer 12 may further contain iodine, a dichroic dye, or the like. 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. be done.

The thickness of the polarizing layer 12 is not particularly limited.

(protective layer)
The protective layer 13 is located on the outermost side in the state where the optical sheet 1 is bonded to the lens 4 and has a function of protecting the layers inside the protective layer 13 . The thickness of the protective layer 13 is not particularly limited, and is preferably 10 μm or more and 1000 μm or less, more preferably 30 μm or more and 60 μm or less.

A constituent material of the protective layer 13 is not particularly limited as long as it has optical transparency, and various resin materials, various glass materials, and the like can be mentioned. Although the resin material is not particularly limited, for example, the same material as the resin material of the specific wavelength absorption layer 11 described above can be used, but the same kind of resin material as the specific wavelength absorption layer 11 is preferable.

The protective layer 13 is preferably stretched in one direction, and the degree of stretching is preferably 1% or more and 10% or less, more preferably 2% or more and 8% or less. Moreover, it is preferable that the stretching direction thereof matches the stretching direction of the polarizing layer 12 . Thereby, the polarization characteristics of the optical sheet 1 as a whole can be improved.

(adhesive layer)
The adhesive layer 14 has a function of bonding the specific wavelength absorption layer 11 and the polarizing layer 12 together. The adhesive layer 15 has a function of bonding the polarizing layer 12 and the protective layer 13 together.

The adhesive (or pressure-sensitive adhesive) constituting the adhesive layer 14 and the adhesive layer 15 is not particularly limited, and examples thereof include acrylic adhesives, urethane adhesives, epoxy adhesives, silicone adhesives, and the like. mentioned. Among them, urethane-based adhesives are preferred. As a result, the transparency, adhesive strength, and durability of the adhesive layers 14 and 15 can be improved, and the conformability to shape changes can be particularly improved.

Further, the adhesives forming the adhesive layer 14 and the adhesive layer 15 may be of the same kind or different.

The thickness of the adhesive layer 14 and the adhesive layer 15 is not particularly limited. The thickness of adhesive layer 14 and adhesive layer 15 may be the same or different.

Now, the optical sheet 1 can absorb light in a specific wavelength range by blending the above-described light absorbers (the first light absorber and the second light absorber). When worn, the contours of objects and people can be clearly recognized, enhancing safety.

Further, by adjusting the wavelength range of light absorbed by the light absorbing agent, light of a predetermined color can be emphasized to the user. In particular, by emphasizing red light (for example, light in the wavelength range of 620 nm or more and 750 nm or less) to the user, yellow light around 580 nm, which people generally feel the most dazzling, is cut to reduce eye fatigue. In addition, since warm colors such as red are emphasized even though the color is gray, which is the standard color of sunglasses, the beauty of autumn leaves can be felt more strongly.

Conventionally, red light is emphasized simply by adding a light absorbing agent that absorbs light in a wavelength range other than red light. However, if there is too much light absorbing agent that absorbs light in wavelength regions other than red light, the transmittance of wavelength regions other than red light is too low, and red light may be emphasized too much. As a result, color discrimination can be difficult. Moreover, if the amount of the light absorbing agent that absorbs light in a wavelength range other than red light is too small, the effect of emphasizing red light may not be obtained sufficiently.

Therefore, the present inventors have made extensive studies and found that the specific wavelength absorption layer 11 having the following structure is effective in solving the above problems, and have completed the present invention. rice field. This will be explained below.

FIG. 6 is a graph showing the light absorption spectrum of the specific wavelength absorption layer 11 (light absorption layer), in which the horizontal axis is the wavelength [nm] and the vertical axis is the transmittance [%]. It should be noted that the transmittance on the vertical axis is correlated with the light absorption rate, that is, 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. 6, the light absorption spectrum of the specific wavelength absorption layer 11 is represented by a curve having a first peak Pa, a second peak Pb and a third peak Pc.

The first peak Pa has a transmission peak wavelength P1 of transmittance in the wavelength range of 480 nm or more and 530 nm or less. The second peak Pb has a transmittance absorption peak wavelength P2 in the wavelength range of 550 nm or more and 610 nm or less. The third peak Pc has an absorptance transmission peak wavelength P3 in the wavelength range of 400 nm or more and 450 nm or less.

By having the first peak Pa, the complementary color of red can be emphasized, and as a result, red can be more emphasized.

The transmittance [%] at the transmission peak wavelength P1 is preferably 8% or more and 40% or less, more preferably 10% or more and 35% or less. Thereby, the complementary color of red can be more emphasized, and as a result, red can be more effectively emphasized.

In addition, having the second peak Pb makes it possible to absorb colors close to red, and as a result, it is possible to further emphasize red.

The transmittance [%] at the absorption peak wavelength P2 is preferably 1% or more and 20% or less, more preferably 2% or more and 17% or less. Thereby, colors close to red can be absorbed more reliably, and as a result, red can be emphasized more effectively.

In addition, by having the third peak Pc having the transmission peak wavelength P3 of the absorptance in the wavelength range of 400 nm or more and 450 nm or less, it is possible to suppress excessive absorption of blue light, and as a result, red is more effective. can be emphasized.

The transmittance [%] at the transmission peak wavelength P3 is preferably 6% or more and 37% or less, more preferably 9% or more and 30% or less. This makes it possible to more reliably suppress excessive absorption of blue light, and as a result, it is possible to more effectively emphasize red.

Further, the half width W1 [nm] at the first peak Pa is preferably 10 nm or more and 40 nm or less, more preferably 15 nm or more and 35 nm or less. Thereby, the complementary color of red can be more emphasized, and as a result, red can be more effectively emphasized.

The half width at the first peak Pa is defined as follows. First, the absorbance is measured outward on both sides of the transmission peak wavelength P1 in increments of 2 nm from the transmission peak wavelength P1. ) are detected, and the wavelength with the higher transmittance among them is taken as the bottom wavelength. Then, the width of the first peak Pa when the difference between the transmittance of the bottom wavelength and the transmittance of the transmission peak wavelength P1 is half the value is defined as the half width of the first peak Pa.

Further, the half width W2 [nm] at the second peak Pb is preferably 10 nm or more and 30 nm or less, more preferably 15 nm or more and 25 nm or less. Thereby, colors close to red can be absorbed more reliably, and as a result, red can be emphasized more effectively.

The half width at the second peak Pb is defined as follows in the same manner as above. First, the absorbance is measured outward on both sides of the absorption peak wavelength P2 in increments of 2 nm from the absorption peak wavelength P2. ) are detected, and the wavelength with the higher transmittance among them 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 absorption peak wavelength P2 is half the value is defined as the half width of the second peak Pb.

Further, the half width W3 [nm] at the third peak Pc is preferably 10 nm or more and 40 nm or less, more preferably 15 nm or more and 35 nm or less. This makes it possible to more reliably suppress excessive absorption of blue light, and as a result, it is possible to more effectively emphasize red.

The half width at the third peak Pc is defined as follows in the same manner as above. First, the absorbance is measured outward from the transmission peak wavelength P3 in increments of 2 nm on both sides of the transmission peak wavelength P3. ) are detected, and the wavelength with the higher transmittance among them 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 transmission peak wavelength P3 is half the value is defined as the half width of the third peak Pc.

Here, in the present invention, in the wavelength region of 630 nm or more and 780 nm or less, which is a wavelength region of red or a color relatively close to red, in the wavelength region A of 630 nm or more and 700 nm or less, the transmittance gradually increases toward the long wavelength side. However, in the wavelength region B of 700 nm or more and 780 nm or less, the transmittance gradually increases toward the long wavelength side. In the present invention, TA<TB is satisfied, where TA is the average gradual increase rate of the transmittance in the wavelength range A and TB is the average gradual increase rate of the transmittance in the wavelength range B. As a result, the color in the wavelength region B of 700 nm or more and 780 nm or less, that is, the transmittance closer to pure red is gradually increased than the color in the wavelength region A of 630 nm or more and 700 nm or less, that is, yellow or orange red. be able to. That is, it is possible to gradually increase the transmittance toward pure red while suppressing the transmittance of yellow and orange-tinged red. As a result, red can be effectively emphasized.

Furthermore, by setting the average transmittance to 70% or less in the wavelength range of 630 nm or more and 780 nm or less, the above relationship can be more reliably emphasized.

Note that the average gradual increase rate is a value obtained by measuring the transmittance toward the high wavelength side in increments of 2 nm and calculating the average rate of increase of each transmittance.

When TA≧TB, yellow and orange-tinged red are conspicuous, and red cannot be clearly emphasized. Also, when the average transmittance in the wavelength range of 630 nm or more and 780 nm or less exceeds 70%, yellow and orange become conspicuous, and the effect of TA<TB cannot be sufficiently obtained.

As described above, the optical sheet 1 of the present invention is composed of a material containing a resin and at least one first light absorbing agent, and the specific wavelength absorption layer 11 that absorbs light in a specific wavelength range in the visible light range. (light absorbing layer), and a polarizing layer 12 containing at least one second light absorbing agent and having a polarizing function. In the light absorption spectrum of the optical sheet 1, the first peak having the transmission peak wavelength P1 of the transmittance in the wavelength range of 480 nm or more and 530 nm or less and the absorption peak wavelength P2 of the transmittance in the wavelength range of 550 nm or more and 610 nm or less. and a second peak. The average transmittance in the wavelength range of 630 nm or more and 780 nm or less is 70% or less, and in the wavelength range A of 630 nm or more and 700 nm or less, the transmittance gradually increases toward the longer wavelength side, and the wavelength of 700 nm or more and 780 nm or less. In the region B, the transmittance gradually increases toward the long wavelength side. When the average gradual increase rate of the transmittance in the wavelength region A is TA, and the average gradual increase rate of the transmittance in the wavelength region B is TB, TA<TB satisfy. As a result, while the transmittance of colors in the wavelength range A, ie, yellow and orange-tinged red, is sufficiently suppressed, the transmittance of colors in the wavelength range B, ie, pure red, can be gradually increased. As a result, red can be effectively emphasized. In addition, according to the present invention, red can be clearly emphasized, so that signal visibility can be improved and autumn leaves can be enjoyed.

Also, TA is preferably 0.14 or more and less than 0.30, and more preferably 0.15 or more and less than 0.27. As a result, the transmittance of colors in the wavelength region A, that is, yellow and orange-tinged red can be sufficiently suppressed.

Also, TB is preferably 0.40 or more and less than 0.75, and more preferably 0.45 or more and less than 0.72. Thereby, it is possible to gradually increase the transmittance of the color in the wavelength region B, that is, the transmittance close to pure red.

Thus, TA is 0.14 or more and less than 0.30, and TB is 0.40 or more and less than 0.75, whereby red can be more effectively emphasized.

Also, the average transmittance in the wavelength range of 630 nm or more and 780 nm or less may be 70% or less, preferably 30% or more, and more preferably 54% or more. Thereby, the effect of the present invention can be obtained more significantly.

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

Preferably, the first light absorbing agent is a merocyanine dye or a tetraazaporphyrin metal complex dye, and the second light absorbing agent is an azo dye. In this case, the content of the first light absorbing agent in the specific wavelength absorption layer 11 is 0.001 w% or more and 0.1 w% or less, and the content of the second light absorbing agent in the polarizing layer 12 is 0.001 w%. It is more preferable that the content is 0.1 wt % or more. Thereby, the optical sheet 1 can have the light absorption spectrum as described above.

The optical sheet 1 preferably has an L* value of 30 or more and 60 or less, more preferably 35 or more and 55 or less. Thereby, red can be emphasized more effectively.

The optical sheet 1 preferably has an a* value of −15 or more and 25 or less, more preferably −10 or more and 20 or less. Thereby, red can be emphasized more effectively.

Further, the optical sheet 1 preferably has a b* value of −10 or more and 30 or less, more preferably −5 or more and 25 or less. Thereby, red can be emphasized more effectively.

In this specification, the L* value, the a* value and the b* value are values measured by "V-760" manufactured by JASCO Corporation.

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 so as to be continuously sent out. 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 specific wavelength absorption layer 11 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 the constituent material of the specific wavelength absorption layer 11 . 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 .

Next, while stretching the polyvinyl alcohol film in a water tank, it is dyed with an aqueous solution containing a dye (second light absorber), immersed in a boric acid solution, washed with water, and dried to obtain polarized light. Layer 12 is obtained.

Then, one surface of the polarizing layer 12 is coated with an adhesive that will become the adhesive layer 14, and the specific wavelength absorption layer 11 is arranged thereon. Next, by drying and curing the adhesive, an optical sheet 1 in which the protective layer 13, the adhesive layer 15, the polarizing layer 12, the adhesive layer 14 and the specific wavelength absorption layer 11 are laminated is obtained.

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, for example, polycarbonate as a lens forming material. 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 molten 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 have an arbitrary component added in addition to the above-described configuration.

More specifically, for example, the optical sheet of the present invention may include an intermediate layer, a power adjusting layer for adjusting 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]
[1] First, 100 parts by mass of bisphenol A polycarbonate ("Iupilon E2000FN E5100" manufactured by Mitsubishi Gas Chemical Co., Ltd.) and 0.02 parts by mass of a light absorber ("FDB-006" manufactured by Yamada Chemical Industry Co., Ltd.) , 0.06 parts by mass of a light absorber (manufactured by Yamada Kagaku Kogyo, "FDG-006") and 0.4 parts by mass of an ultraviolet absorber (manufactured by Adeka Co., Ltd., "ADEKA STAB LA-31G") are stirred and mixed. By doing so, an optical sheet forming material was prepared.

[2] Next, the optical sheet forming material was placed 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 unit 300 to form a specific wavelength absorption layer having an average thickness of 0.3 mm.

[3] As a protective layer forming material, 100 parts by mass of bisphenol A type polycarbonate (manufactured by Mitsubishi Engineering-Plastics, "Iupilon E2000FN E5100") was prepared, and the protective layer forming material was prepared by the optical sheet manufacturing apparatus shown in FIG. The mixture was placed in an extruder 210 of No. 100, melted, and extruded from a T-die 220 to obtain a protective layer. The thickness of the protective layer obtained was 0.325 mm.

[4] In addition, while stretching a polyvinyl alcohol film ("Kuraray Vinylon #7500" manufactured by Kuraray Co., Ltd.) in a water tank, it is dyed with an aqueous solution in which a dye (second light absorber) is dissolved, and then immersed in a boric acid solution. A polarizing layer was obtained by performing treatment, washing with water, and drying. When dissolving the dyes, the types of dyes shown in Table 1 were dissolved so that the blending amounts shown in Table 1 were obtained after drying. Moreover, the thickness of the obtained polarizing layer was 0.02 mm.

[5] Then, an adhesive was applied to one side and the other side of the obtained polarizing layer, and the protective layer and the specific wavelength absorbing layer were arranged as shown in FIG. After that, the adhesive was dried to obtain a laminated body in which a protective layer, a polarizing layer and a specific wavelength absorbing layer were laminated, that is, an optical sheet.

In the light absorption spectrum of the obtained optical sheet, the average transmittance in the wavelength range of 630 nm or more and 780 nm or less was 54.1%. Also, the average increment rate TA was 0.18 and the average increment rate TB was 0.51.

The transmission peak wavelength P1 was 505 nm, the absorption peak wavelength P2 was 585 nm, and the transmission peak wavelength P3 was 415 nm.

Further, the transmittance at the transmission peak wavelength P1 is 29.0%, the transmittance at the absorption peak wavelength P2 is 6.5%, and the transmittance at the transmission peak wavelength P3 is 24.7%. Met.

The half width W1 was 13 nm, the half width W2 was 13 nm, and the half width W3 was 12 nm.

The L* value was 52.1, the a* value was -3.8, and the b* value was 0.5.

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

[Comparative Example 1]
An optical layer of Comparative Example 1 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 2]
An optical sheet of Comparative Example 2 was 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 Example 3]
An optical sheet of Comparative Example 3 was 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 Example 4]
An optical sheet of Comparative Example 4 was obtained in the same manner as in Example 1 except that the configuration of the optical sheet was changed as shown in Table 1.

Further, in Table 1, a1 represents the first light absorber (manufactured by Yamada Kagaku Kogyo, "FDB-006"), and a2 represents the first light absorber (manufactured by Yamada Kagaku Kogyo, "FDG-005"). , b1 represents the second light absorbing agent (manufactured by Huntsman, "SOLOPHENYL BLUE FGLE220%"), b2 represents the second light absorbing agent (manufactured by Tokyo Aniline, "Sumilight Red 4B"), and b3 represents , indicates the second light absorbing agent (“EVERDIRECT SUPRA ORANGE 2GL” manufactured by Eikou Taiwan Co., Ltd.), and b4 indicates the second light absorbing agent (“LA1120 Chrysophene” manufactured by Kyowa Sangyo Co., Ltd.).

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

(Red enhancement evaluation)
A photograph of the red modeled object was taken through the optical sheet manufactured as described above, and it was confirmed whether or not this photograph had an effect of enhancing the red color on each of 10 people.
⊚: Effective for 10 out of 10 people.
◯: Effective for 6 to 9 out of 10 people.
△: Effective for 2 to 5 out of 10 people.
×: Effective for 1 person out of 10.

(Evaluation of distinguishability of other colors)
A photograph of the model was taken through the optical sheet manufactured as described above, and this photograph was used by 10 people to confirm whether they could correctly identify the color of the model.
⊚: 10 out of 10 persons could be identified.
O: 6 to 9 out of 10 persons could be identified.
Δ: 2 to 5 out of 10 persons could be identified.
×: 1 person out of 10 could be identified.

The evaluation results of 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 sheet of each example was able to emphasize red color more than that of each comparative example, and the result was satisfactory for each 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 component 10' Optical component 11 Specific wavelength absorption layer 12 Polarizing layer 13 Protective layer 14 Adhesive layer 15 Adhesive Layer 21 Rim portion 22 Bridge portion 23 Temple portion 24 Nose pad portion 100 Optical sheet manufacturing apparatus 200 Sheet supply section 210 Extruder 220 T-die 300 Sheet molding section 310 Touch roll 320 Cooling roll 330 Post cooling roll 400 Optical component manufacturing apparatus 500 Resin Supply part 600 Mold 610 Cavity 620 Supply port 630 Upper member 640 Lower member 641 Bottom surface

Claims (9)

A light-absorbing layer made of a material containing a resin and at least one first light-absorbing agent that absorbs light in a specific wavelength range in the visible light region, and at least one second light-absorbing agent, An optical sheet comprising a polarizing layer having a polarizing function,
In the light absorption spectrum of the optical sheet,
A first peak having a transmittance transmission peak wavelength P1 in a wavelength range of 480 nm or more and 530 nm or less, a second peak having a transmittance absorption peak wavelength P2 in a wavelength range of 550 nm or more and 610 nm or less, and a wavelength of 400 nm or more and 450 nm or less. having a transmission peak wavelength P3 of transmittance in the region,
The average transmittance in the wavelength range of 630 nm or more and 780 nm or less is 70% or less, and the transmittance gradually increases toward the longer wavelength side in the wavelength range A of 630 nm or more and 700 nm or less, and the wavelength range B of 700 nm or more and 780 nm or less. At , the transmittance gradually increases toward the longer wavelength side,
An optical sheet that satisfies TA<TB, where TA is an average gradual increase in transmittance in the wavelength range A and TB is an average gradual increase in transmittance in the wavelength range B. The TA is 0.14 or more and less than 0.30,
The optical sheet according to claim 1, wherein the TB is 0.40 or more and less than 0.75. 3. The optical sheet according to claim 1, wherein the transmittance at the transmission peak wavelength P1 is 8% or more and 40% or less. 4. The optical sheet according to any one of claims 1 to 3, wherein the transmittance at the absorption peak wavelength P2 is 1% or more and 20% or less. 5. The optical sheet according to claim 4, wherein the first light absorber is at least one of quinoline dyes, anthraquinone dyes, perylene dyes, polymethine dyes, porphyrin complex dyes, and phthalocyanine dyes. The second light absorber is at least one of an azo dye, a stilbene dye, a thiazole dye, a dioxazine dye, a phthalocyanine dye, a disazo dye, a trisazo dye, and a metal complex salt azo dye. Item 5. The optical sheet according to item 4. The optical sheet according to any one of claims 1 to 6, wherein the half width at the first peak is 10 nm or more and 40 nm or less. The optical sheet according to any one of claims 1 to 7, wherein the second peak has a half width of 10 nm or more and 30 nm or less. a substrate;
An optical component comprising: the optical sheet according to any one of claims 1 to 8, which is laminated on the base material.

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