JP2019144327A - Optical sheet and optical component - Google Patents

Abstract

To provide an optical sheet and an optical component capable of sufficiently increasing the transmittance for visible light as well as achieving both shielding against infrared rays and shielding against scattered light.SOLUTION: The optical sheet of the present invention includes a light-absorbing layer comprising a resin material and a light absorbent that absorbs light in a wavelength region of 780 nm or more and 2500 nm or less, and a polarizing layer laminated on the light-absorbing layer and having a polarizing function. The optical sheet shows, in a light transmission spectrum, a peak having a peak wavelength of the light transmittance from 730 nm to 830 nm, an average light transmittance of 10 or more in the wavelength region from 380 nm to 780 nm, and an average light transmittance of 10 or less in the wavelength region from 780 nm to 2500 nm.SELECTED DRAWING: Figure 4

Description

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

  An optical sheet that absorbs a specific wavelength region from incident light is known for the purpose of anti-glare and eye protection (for example, see Patent Document 1). This optical sheet is used by being attached to glasses, sunglasses, a sun visor or the like.

  The optical sheet described in Patent Document 1 includes a thermoplastic resin, a near infrared absorber, and an ultraviolet absorber. For this reason, by sticking the optical sheet on a lens such as eyeglasses, the entry of ultraviolet rays, infrared rays, etc. into the eyes of the wearer is alleviated.

  In such an optical sheet, it is also required to block disturbance light among the incident light. In view of this, it is conceivable to laminate a polarizing layer that blocks incident turbulence on the optical sheet described above. However, by simply laminating the polarizing layer on the optical sheet described above, it is not possible to sufficiently achieve both the blocking of disturbance light in the visible light region and the blocking of light in the invisible light region such as infrared rays and ultraviolet rays.

JP 2017-149820 A

  An object of the present invention is to provide an optical sheet and an optical component that can sufficiently increase the transmittance of visible light, and can achieve both shielding of infrared rays and shielding of irregular light.

Such an object is achieved by the present inventions (1) to (8) below.
(1) a light absorption layer including a resin material and a light absorber that absorbs light in a wavelength range of 780 nm to 2500 nm;
A polarizing layer laminated on the light absorbing layer and having a polarizing function,
In the light transmission spectrum, it has a peak having a peak wavelength of light transmittance between 730 nm and 830 nm,
The average light transmittance in the wavelength region of 380 nm or more and 780 nm or less is 10 or more,
An optical sheet having an average light transmittance of 10 or less in a wavelength range of more than 780 nm and 2500 nm or less.

(2) In the light transmission spectrum, when the peak wavelength of the light transmittance between 730 nm and 830 nm is the peak wavelength P1, and the peak is the first peak,
The optical sheet according to (1), wherein the light transmission spectrum has a second peak having a peak wavelength P2 of light transmittance between 420 nm and 520 nm.

  (3) The optical sheet according to (2), wherein the light transmittance at the peak wavelength P1 is 10% or more and 50% or less.

  (4) The optical sheet according to (2) or (3), wherein the light transmittance at the peak wavelength P2 is 10% or more and 50% or less.

  (5) The optical sheet according to any one of (1) to (4), wherein a content of the light absorber in the light absorption layer is 0.001 wt% or more and 2 wt% or less.

  (6) The optical sheet according to any one of (1) to (5), wherein an average thickness of the light absorption layer is 0.05 mm or more and 0.3 mm or less.

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

(8) a base material;
An optical component comprising: the optical sheet according to any one of (1) to (7), which is laminated on the base material.

  According to the present invention, it is possible to provide an optical sheet and an optical component that can sufficiently ensure the transmittance of visible light and can simultaneously achieve a polarization function and an infrared absorption function.

It is a perspective view of sunglasses provided with the optical sheet of the present invention. It is a perspective view of a sun visor provided with the optical sheet of the present invention. It is sectional drawing of the optical sheet shown in FIG. 1 and FIG. It is a graph which shows the light transmission spectrum of the optical sheet shown in FIG. It is a graph which shows the light transmission spectrum of the polarizing layer shown in FIG. It is a graph which shows the light transmission spectrum of the infrared rays absorption layer shown in FIG.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an optical sheet and an optical component of the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.

<Embodiment>
FIG. 1 is a perspective view of sunglasses provided with the optical sheet of the present invention. FIG. 2 is a perspective view of a sun visor provided with the optical sheet of the present invention. FIG. 3 is a cross-sectional view of the optical sheet shown in FIGS. 1 and 2. FIG. 4 is a graph showing a light transmission spectrum of the optical sheet shown in FIG. FIG. 5 is a graph showing a light transmission spectrum of the polarizing layer shown in FIG. FIG. 6 is a graph showing a light transmission spectrum of the infrared absorption layer shown in FIG.

  1 to 3, the upper side is referred to as “upper” or “upper”, and the lower side is also referred to as “lower” or “lower”. In the drawings referred to in the present specification, the dimension in the thickness direction is exaggerated and is greatly different from the actual dimension.

  The optical sheet 1 of the present invention shown in FIGS. 1 to 3 includes an infrared absorption layer 40 (light absorption) including a resin material and an infrared absorber (light absorber) that absorbs light in a wavelength range of 780 nm to 2500 nm. Layer) and a polarizing layer 30 that is laminated on the infrared absorption layer 40 and has a polarization function, and in the light transmission spectrum, a first peak Pa (having a peak wavelength P1 of light transmittance between 730 nm and 830 nm or less. The average light transmittance in a wavelength region of 380 nm to 780 nm is 10 or more, and the average light transmittance in a wavelength region of more than 780 nm to 2500 nm is 10 or less.

  Thereby, the transmittance of visible light can be made sufficiently high, and the transmittance of infrared rays can be made sufficiently low. Therefore, it is possible to achieve both a polarization function and an infrared absorption function while maintaining a high visible light transmittance. As a result, both good visibility and eye protection can be achieved.

  When the peak wavelength P1 of the light transmittance is located in a wavelength region shorter than 730 nm, the infrared transmittance tends to increase. On the other hand, when the peak wavelength P1 of the light transmittance is located in a wavelength region longer than 830 nm, the visible light transmittance tends to decrease.

  Moreover, when the average light transmittance in a wavelength region of 380 nm or more and 780 nm or less is lower than 10, the wearer's visual field becomes dark.

  In addition, when the average light transmittance in the wavelength range from 780 nm to 2500 nm is larger than 10, the infrared absorption function is insufficient.

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

  As shown in FIG. 1, the sunglasses (optical component 10) includes a frame 2 attached to the user's head and a lens 3 with an optical sheet (optical component) fixed to the frame 2. In the present specification, the “lens” includes both a lens having a light collecting function and a lens having no light collecting 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. And have. Each rim portion 21 has a ring shape, and is a portion on which the lens 3 with an optical sheet is attached.

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

  The shape of the frame 2 is not limited to that shown in the drawing as long as it can be worn 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 surface of the lens 4 on the front side (the side opposite to the human eye in a worn state). Thereby, the function as sunglasses can be exhibited, enjoying the advantage of the optical sheet 1 mentioned above.

  As shown in FIG. 2, the sun visor (optical component 10 ′) includes a ring-shaped mounting portion 5 that is mounted on the user's head, and a flange 6 that is provided in front of the mounting portion 5. Yes. The collar 6 includes a light transmissive member 7 (base material) and the optical sheet 1 provided on the upper surface of the light transmissive member 7. Thereby, the function as a sun visor can be exhibited, enjoying the advantage of the optical sheet 1 mentioned above.

  The constituent materials of the lens 4 and the light transmissive member 7 are not particularly limited as long as they have light transmissive properties, and include various resin materials and various glasses, but the same kind as the polycarbonate of the optical sheet 1. Polycarbonate is preferred. Thereby, the adhesiveness of the lens 4 or the light transmissive member 7 and the optical sheet 1 can be improved.

  Hereinafter, the optical sheet 1 will be described in detail. In the following, a case where the lens 4 (base material) is laminated will be representatively described.

  As shown in FIG. 3, the optical sheet 1 includes a protective layer 20, a polarizing layer 30, an infrared absorption layer 40, an adhesive layer 50 that joins the protective layer 20 and the polarizing layer 30, a polarizing layer 30 and an infrared absorption. And an adhesive layer 60 that joins the layer 40. In the optical sheet 1, the infrared absorption layer 40, the adhesive layer 60, the polarizing layer 30, the adhesive layer 50, and the protective layer 20 are laminated in this order. Moreover, in this embodiment, the optical sheet 1 is arrange | positioned in the direction in which the infrared rays absorption layer 40 is located in the lens 4 side.

(Protective layer 20)
The protective layer 20 is located in the outermost layer of the optical sheet 1 and has a function of protecting the lower layer such as the polarizing layer 30.

  The protective layer 20 is made of a resin material. The resin material is not particularly limited, and examples thereof include polycarbonate, polyamide, polyvinyl chloride, polyethylene, and polypropylene. Among these, polycarbonate is preferable.

  The polycarbonate is not particularly limited, and various types can be used. Among them, an aromatic polycarbonate is preferable. The aromatic polycarbonate has an aromatic ring in its main chain, and thereby, the strength of the optical sheet 1 can be further improved.

  This aromatic polycarbonate is synthesized by, for example, an interfacial polycondensation reaction between bisphenol and phosgene, a 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 the repeating unit of the 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 a C1-C18 alkyl group, an aromatic group, or a cycloaliphatic group, Ra and Rb are respectively independently a C1-C12 alkyl group. , M and n are each an integer of 0 to 4, and p is the number of repeating units.)

  In addition, as a bisphenol used as the origin of the repeating unit of the polycarbonate shown to the said Formula (1), specifically, 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, the polycarbonate is preferably composed mainly of a bisphenol-type polycarbonate having a skeleton derived from bisphenol. By using such a bisphenol-type polycarbonate, the optical sheet 1 exhibits further excellent strength.

  Further, the content of the polycarbonate in the protective layer 20 is preferably 70 wt% or more and 100 wt% or less, and more preferably 90 wt% or more and 100 wt% or less. Thereby, the effect of this invention can be exhibited more reliably. Thereby, the intensity | strength of the protective layer 20 can be made more excellent.

  The stretch ratio of the protective layer 20 is preferably 1 or more and 5 or less, and more preferably 1 or more and 3 or less. Thereby, it can prevent or suppress that the color nonuniformity, the infrared light absorber nonuniformity, and the ultraviolet absorber nonuniformity arise at the time of extending | stretching.

  Further, the thickness of the protective layer 20 is preferably 0.05 mm or more and 3.0 mm or less, and more preferably 0.1 mm or more and 1.0 mm or less. Thereby, the lower layer (polarizing layer 30 etc.) of the protective layer 20 can be sufficiently protected.

(Polarizing layer 30)
The polarizing layer 30 shown in FIG. 3 has a function of extracting linearly polarized light having a polarization plane in a predetermined direction from incident light (natural light that is not polarized). Thereby, the incident light incident on the eyes via the optical sheet 1 is polarized light from which the disturbance light is removed.

  Although the polarization degree of the polarizing layer 30 is not specifically limited, For example, it is preferable that they are 50% or more and 100% or less, and it is more preferable that they are 80% or more and 100% or less. Further, the visible light transmittance of the polarizing layer 30 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 layer 30 is not particularly limited as long as it has the above-mentioned function. For example, polyvinyl alcohol (PVA), partially formalized polyvinyl alcohol, polyethylene vinyl alcohol, polyvinyl butyral, polycarbonate, ethylene- A dichroic substance such as iodine or a dichroic dye is adsorbed and dyed on a polymer film composed of a vinyl acetate copolymer partially saponified product, uniaxially stretched, dehydrated polyvinyl alcohol or poly Examples thereof include polyene-based oriented films such as a dehydrochlorinated product of vinyl chloride.

  Among these, the polarizing layer 30 is preferably a film obtained by adsorbing or dyeing iodine or a dichroic dye on a polymer film containing polyvinyl alcohol (PVA) as a main material and uniaxially stretching. Polyvinyl alcohol (PVA) is a material excellent in transparency, heat resistance, affinity with iodine or dichroic dye as a dyeing agent, and orientation during stretching. Therefore, the polarizing layer 30 containing PVA as a main material has excellent heat resistance and excellent polarizing function.

  Examples of the dichroic dye include chloratin fast red, congo red, brilliant blue 6B, benzoperpurine, chlorazole black BH, direct blue 2B, diamine green, chrysophenone, sirius yellow, direct first red, and acid black. Etc.

  The thickness of the polarizing layer 30 is not particularly limited, and is preferably, for example, from 5 μm to 60 μm, and more preferably from 10 μm to 40 μm.

  Such a polarizing layer 30 has a light transmission spectrum as shown in FIG. In addition, the light transmission spectrum shown in FIG. 5 is a graph which shows the light transmission spectrum in the polarizing layer 30 single-piece | unit.

(Infrared absorbing layer 40)
The infrared absorption layer 40 is provided on the lens 4 side and has a function of absorbing and shielding infrared rays. Thereby, a wearer's eyes can be protected.

  The infrared absorption layer 40 includes a resin material and an infrared absorber (light absorber) that absorbs light in a wavelength range of 780 nm to 2500 nm.

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

  The polycarbonate is not particularly limited, and various types can be used. Among them, an aromatic polycarbonate is preferable. The aromatic polycarbonate has an aromatic ring in its main chain, and thereby, the strength of the infrared absorption layer 40 can be further improved.

  This aromatic polycarbonate is synthesized by, for example, an interfacial polycondensation reaction between bisphenol and phosgene, a 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 the repeating unit of the 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 a C1-C18 alkyl group, an aromatic group, or a cycloaliphatic group, Ra and Rb are respectively independently a C1-C12 alkyl group. , M and n are each an integer of 0 to 4, and p is the number of repeating units.)

  In addition, as a bisphenol used as the origin of the repeating unit of the polycarbonate shown to the said Formula (1), specifically, 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, the polycarbonate is preferably composed mainly of a bisphenol-type polycarbonate having a skeleton derived from bisphenol. By using such a bisphenol-type polycarbonate, the optical sheet 1 exhibits further excellent strength.

  Further, the polycarbonate content in the infrared absorbing layer 40 is preferably 87 wt% or more and 99.949 wt% or less, and more preferably 90 wt% or more and 99.87 wt% or less. Thereby, the intensity | strength of the infrared rays absorption layer 40 can fully be raised.

  The infrared absorber has a function of absorbing light in a wavelength range of 780 nm to 2500 nm. In the present specification, “absorption” means that the transmittance is 10% or less.

  Infrared absorbers include metal borides, titanium oxide, zirconium oxide, tin-doped indium oxide (ITO), antimony-doped tin oxide (ATO), tungsten oxide compounds, diimonium compounds, phthalocyanine compounds, naphthalocyanine compounds, azo compounds, aminium compounds , Cyanine compounds, squarylium compounds, anthraquinone compounds, funatoquinone compounds, dithiol compounds, polymethine compounds and the like.

  Among these, a tungsten oxide compound, a diimonium compound, a phthalocyanine compound, a naphthalocyanine compound, and a dithiol compound are preferable, and a tungsten oxide compound is more preferable.

  The content of the infrared absorber in the infrared absorption layer 40 is preferably 0.001 wt% or more and 2 wt% or less, more preferably 0.002 wt% or more and 1.0 wt% or less, and 0.002 wt% or more. More preferably, it is 0.1 wt% or less. Thereby, infrared rays can be sufficiently absorbed, light in the visible light region can be satisfactorily transmitted, and sufficient strength of the infrared absorption layer 40 can be ensured.

  Such an infrared absorbing layer 40 may be stretched or non-stretched, but is preferably non-stretched. Thereby, it is possible to prevent the occurrence of unevenness in the position where the infrared absorber is present by stretching, that is, the infrared absorber is dispersed in the infrared absorption layer 40 as uniformly as possible.

  Moreover, it is preferable that it is 0.05 mm or more and 3.0 mm or less, and, as for the thickness of the infrared rays absorption layer 40, it is more preferable that it is 0.1 mm or more and 1.0 mm or less. Thereby, the lower layer (polarizing layer 30 etc.) of the infrared absorption layer 40 can be sufficiently protected from infrared rays.

  Such an infrared absorption layer 40 has a light transmission spectrum as shown in FIG. In addition, the light transmission spectrum shown in FIG. 6 is a graph which shows the light transmission spectrum in the infrared absorption layer 40 single-piece | unit.

(Adhesive layer 50 and adhesive layer 60)
The adhesive layer 50 is provided between the protective layer 20 and the polarizing layer 30 and joins the protective layer 20 and the polarizing layer 30 together. The adhesive layer 60 is provided between the polarizing layer 30 and the infrared absorbing layer 40 and joins the polarizing layer 30 and the infrared absorbing layer 40 together. The adhesive (or pressure-sensitive adhesive) that constitutes the adhesive layer 50 and the adhesive layer 60 is not particularly limited, and examples thereof include acrylic adhesives, urethane adhesives, epoxy adhesives, silicone adhesives, and the like. Can be mentioned.

  Of these, urethane adhesives are preferred. As a result, it is possible to make the adhesive layer 50 and the adhesive layer 60 more excellent in transparency, adhesive strength, durability, and particularly excellent in followability to shape change.

  The thicknesses of the adhesive layer 50 and the adhesive layer 60 may be the same or different, but are preferably 1 μm or more and 200 μm or less, and more preferably 10 μm or more and 100 μm or less.

  In addition, the adhesive bond layer 50 and the adhesive bond layer 60 may be comprised with the same adhesive agent, and may differ.

Next, the light transmission spectrum of the optical sheet 1 will be described.
FIG. 4 is a graph showing a light transmission spectrum of the optical sheet. In FIG. 4, the horizontal axis indicates the wavelength [nm], and the vertical axis indicates the light transmittance [%].

  As shown in FIG. 4, the light transmission spectrum of the optical sheet 1 is represented by a curve having a first peak Pa and a second peak Pb. The first peak Pa has a transmittance peak wavelength P1 between 730 nm and 830 nm. On the other hand, the second peak Pb has a transmittance peak wavelength P2 between 420 nm and 520 nm.

  Here, simply combining the polarizing layer and the infrared absorbing layer cannot achieve both a sufficient polarizing function and a sufficient infrared absorbing function while sufficiently increasing the visible light transmittance. That is, the visible light transmittance is preferably sufficiently high, and the infrared light transmittance is preferably sufficiently low. However, if one is satisfied, it becomes difficult to satisfy the other.

  In other words, simply increasing the transmittance of visible light also increases the transmittance of infrared light. On the other hand, if the infrared transmittance is simply lowered, the visible light transmittance is lowered. This is because the shapes of the first peak Pa and the second peak Pb influence each other. That is, the transmittance in the visible light region and the transmittance in the infrared region influence each other. However, in the past, sufficient studies have not been made to achieve both a polarization function and an infrared absorption function.

  Thus, the present inventors have found that both the polarization function and the infrared absorption function can be achieved by satisfying the following conditions, and the present invention has been completed.

  Specifically, in the light transmission spectrum, the first peak Pa having the peak wavelength P1 of the light transmittance is between 730 nm and 830 nm, and the average light transmittance in the wavelength region of 380 nm to 780 nm is 10 or more. In addition, when the average light transmittance in the wavelength range from 780 nm to 2500 nm is 10 or less, the visible light transmittance can be sufficiently increased, and the infrared transmittance can be sufficiently decreased. Therefore, it is possible to achieve both a polarization function and an infrared absorption function while maintaining a high visible light transmittance. As a result, both good visibility and eye protection can be achieved.

  When the peak wavelength P1 of the light transmittance is located in a wavelength region shorter than 730 nm, the infrared transmittance tends to increase. On the other hand, when the peak wavelength P1 of the light transmittance is located in a wavelength region longer than 830 nm, the visible light transmittance tends to decrease.

  Moreover, when the average light transmittance in a wavelength region of 380 nm or more and 780 nm or less is smaller than 10, the wearer's visual field becomes dark.

  Further, when the average light transmittance in the wavelength range of more than 780 nm and 2500 nm or less is larger than 10, the infrared absorption function becomes insufficient.

The average light transmittance in this specification is a value calculated as follows.
It is the average value of the values calculated by measuring the light transmittance at each wavelength in increments of 2 nm using “JASCO V-670” and adding the ANSI weight coefficient to the measured value. That is, in the present invention, in the region of 380 nm or more and 780 nm or less, the light transmittance at each wavelength is measured in increments of 2 nm, and the average value of the values calculated by adding the ANSI weight coefficient to the measured value is 10 or more. In the region of more than 780 nm and 2500 nm or less, the light transmittance at each wavelength is measured in increments of 2 nm, and the average value of values calculated by integrating the ANSI weight coefficient to the measured value is 10 or less.

  The ANSI weight coefficient is a coefficient determined by the American National Standard Institute regarding spectacles.

  In the optical sheet 1, the infrared absorption rate of the infrared absorption layer 40 mainly contributes to the formation of the first peak Pa, and the visible light transmittance of the polarizing layer 30 contributes to the formation of the second peak Pb.

  By adjusting the type and content of the infrared absorbent in the infrared absorbing layer 40, the position and transmittance of the peak wavelength P1 of the first peak Pa can be adjusted. Further, by adjusting the degree of polarization and the thickness of the polarizing layer 30, the position and transmittance of the peak wavelength P2 of the second peak Pb can be adjusted.

  The light transmittance T1 is preferably larger than the light transmittance T2. The difference ΔT between the light transmittance T1 and the light transmittance T2 is preferably 2% or more and 30% or less, and more preferably 5% or more and 20% or less. Thereby, the effect of this invention can be acquired more notably.

  The light transmittance T1 at the peak wavelength P1 is preferably 10% or more and 50% or less, and more preferably 20% or more and 40% or less. Thereby, the effect of this invention can be exhibited more reliably.

  When the light transmittance T1 is too large, the light transmittance in the infrared region tends to increase. On the other hand, if the light transmittance T1 is too small, the light transmittance in the visible light region tends to increase.

  The light transmittance T2 at the peak wavelength P2 is preferably 10% or more and 50% or less, and more preferably 20% or more and 40% or less. Thereby, the effect of this invention can be exhibited more reliably.

  If the light transmittance T2 is too large, the light transmittance in the visible light region tends to increase. On the other hand, if the light transmittance T2 is too small, the light transmittance in the infrared region tends to increase.

  The half width Wa of the first peak Pa is preferably 30 nm or more and 200 nm or less, and more preferably 50 nm or more and 150 nm or less. Thereby, excessive absorption of visible light can be suppressed, and both absorption of infrared light and transmission of visible light can be achieved.

  The half width Wb of the second peak Pb is preferably 30 nm or more and 200 nm or less, and more preferably 50 nm or more and 150 nm or less. Thereby, excessive absorption of visible light can be suppressed and a visual field becomes more favorable.

  The full width at half maximum Wa at the first peak Pa is defined as follows. First, the absorbance is measured outward from the peak wavelength P1 in steps of 2 nm on both sides of the peak wavelength P1, and the first wavelength at which the change in absorbance is 0.005 or less (30 nm or more away from the center) Two are detected, and the wavelength having the higher transmittance is set 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-value width Wa at the first peak Pa.

  The half width Wb at the second peak Pb is defined as follows in the same manner as described above. First, the absorbance is measured toward the outside on both sides of the peak wavelength P2 in steps of 2 nm from the peak wavelength P2, and the first wavelength at which the change in absorbance is 0.005 or less (10 nm or more away from the center) Two are detected, and the wavelength having the higher transmittance is set 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-value width Wb at the second peak Pb.

  Thus, in the present invention, in the light absorption spectrum, when the peak wavelength of light transmittance between 730 nm and 830 nm is the peak wavelength P1, the light transmittance is between 420 nm and 520 nm in the light transmission spectrum. It has the 2nd peak Pb which has the peak wavelength P2. Thereby, the transmittance of visible light can be made sufficiently high, and the transmittance of infrared rays can be made sufficiently low. In particular, by having two peaks as described above in the light transmission spectrum as described above, the blue-green color of visible light can be cut. Therefore, the contrast of the visual field can be increased.

  Such an optical sheet 1 may be adhered to the surface of the lens 4 via an adhesive layer, or may be formed integrally with the lens 4. When the lens 4 is integrally formed, first, the optical sheet 1 is placed in a mold, and a material (for example, a resin material) that becomes the molten lens 4 is poured into the mold to be molded. Can be used.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention. It is.

  For example, each part which comprises the optical sheet of this invention can be substituted with the thing of the arbitrary structures which can exhibit the same function.

  In addition to the above-described configuration, the optical sheet of the present invention may have an arbitrary configuration added thereto.

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

Hereinafter, based on an Example, this invention is demonstrated more concretely.
1. 1. Examination of optical sheet 1-1. Creation of optical sheet

[Example 1]
[1] First, 100 parts by mass of a bisphenol A type polycarbonate (manufactured by Mitsubishi Gas Chemical Company, “Iupilon E2000FN E5100”) was extruded to obtain a protective layer. The thickness of the protective layer was 0.325 mm.

  [2] On the other hand, 100 parts by mass of bisphenol A-type polycarbonate (manufactured by Mitsubishi Gas Chemical Company, “Iupilon E2000FN E5100”) and 0.005 parts by mass of infrared absorber (“YMDS-874” manufactured by Sumitomo Metal Mining Co., Ltd.) Were mixed to prepare an optical sheet molding material, and an infrared absorption layer was obtained by extrusion molding. Note that the thickness of the infrared absorption layer was 0.3 mm.

  [3] On the other hand, while stretching a polyvinyl alcohol film (“Kuraray Vinylon # 7500” manufactured by Kuraray Co., Ltd.) in a water tank, C.I. I. After dyeing with an aqueous solution in which direct black 17 was dissolved, the film was immersed in a boric acid solution, and further washed with water and dried to obtain a polarizing layer.

  [4] Then, a urethane adhesive that becomes an adhesive layer by being cured is applied to both surfaces of the polarizing layer, a protective layer is applied from one surface side, and an infrared absorbing layer is applied from the other surface side. And then the adhesive was cured. Thereby, the optical sheet shown in FIG. 3 was obtained.

  In the obtained optical sheet, the peak wavelength P1 of the first peak (peak) was 780 nm, and the peak wavelength P2 of the second peak was 470 nm. Further, the average light transmittance Ta in the wavelength region of 380 nm or more and 780 nm or less was 30.4%, and the average light transmittance Tb in the wavelength region of more than 780 nm and 2500 nm or less was 6.5%.

[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.

[Comparative Example 1]
An optical sheet of Comparative Example 1 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 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.

  In Table 1, A represents a bisphenol A polycarbonate (manufactured by Mitsubishi Gas Chemical Company, “Iupilon E2000FN E5100”), B represents a polyvinyl alcohol film (“Kuraray Vinylon # 7500” manufactured by Kuraray), and C Represents a urethane-based adhesive, D1 represents “YMDS-874” (infrared absorber) manufactured by Sumitomo Metal Mining, and D2 represents “KAYASORB IRG-069” (infrared absorber) manufactured by Nippon Kayaku Co., Ltd. D3 indicates “FDN-010” (infrared absorber) manufactured by Yamada Chemical Co., Ltd., D4 indicates “FDN-008” (infrared absorber) manufactured by Yamada Chemical Industries, Ltd., and D5 indicates Tokyo Chemical Industry Co., Ltd. “B4361” (infrared absorbing agent) manufactured by the company is shown, and D6 indicates “B4360” (infrared absorbing agent) manufactured by Tokyo Chemical Industry Co., Ltd.

  In addition, the compounding ratio of the infrared absorbers D1, D5, and D6 in the optical sheet of Example 2 is 5: 1: 1. Moreover, the compounding ratio of the infrared absorbers D1, D3, D4, D5, and D6 in the optical sheet of Example 3 is 10: 1: 1: 1: 1.

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

(Infrared absorption characteristic evaluation)
The infrared transmittance of the optical sheet produced as described above was measured using “JASCO V-670”.
A: The transmittance is 0% or more and 7% or less.
B: The transmittance is more than 7% and 10% or less.
C: The transmittance is more than 10% and 15% or less.
D: The transmittance is over 15%.

(Visible light transmittance evaluation)
The visible light transmittance of the optical sheet produced as described above was measured using “JASCO V-670”.
A: The transmittance is more than 15%.
B: The transmittance is more than 10% and 15% or less.
C: The transmittance is more than 7% and 10% or less.
D: The transmittance is 0% or more and 7% or less.

(Evaluation of polarization function)
The polarizing function of the optical sheet produced as described above was measured using “JASCO V-760”.
A: The degree of polarization is more than 97% and 100% or less.
B: The degree of polarization is more than 95% and not more than 97%.
C: Polarization degree is more than 93% and 95 or less.
D: The degree of polarization is 0% or more and 93% or less.

  The evaluation results in 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 in each example exhibited satisfactory results for each comparative example while exhibiting a strength equal to or higher than that of each comparative example.

DESCRIPTION OF SYMBOLS 1 Optical sheet 2 Frame 3 Lens with optical sheet 4 Lens 5 Mounting part 6 Head 7 Light transmissive member 21 Rim part 22 Bridge part 23 Temple part 24 Nose pad part 10 Optical part 10 'Optical part 20 Protective layer 30 Polarizing layer 40 Infrared Absorbing layer 50 Adhesive layer 60 Adhesive layer P1 Peak wavelength P2 Peak wavelength Pa First peak Pb Second peak Wa Half width Wb Half width

Claims (8)

A light absorption layer comprising a resin material and a light absorber that absorbs light in a wavelength range of 780 nm to 2500 nm;
A polarizing layer laminated on the light absorbing layer and having a polarizing function,
In the light transmission spectrum, it has a peak having a peak wavelength of light transmittance between 730 nm and 830 nm,
The average light transmittance in the wavelength region of 380 nm or more and 780 nm or less is 10 or more,
An optical sheet having an average light transmittance of 10 or less in a wavelength range of more than 780 nm and 2500 nm or less. In the light transmission spectrum, when the peak wavelength of the light transmittance between 730 nm and 830 nm or less is the peak wavelength P1, and the peak is the first peak,
2. The optical sheet according to claim 1, wherein the light transmission spectrum has a second peak having a peak wavelength P <b> 2 of light transmittance between 420 nm and 520 nm.   The optical sheet according to claim 2, wherein the light transmittance at the peak wavelength P1 is 10% or more and 50% or less.   The optical sheet according to claim 2 or 3, wherein the light transmittance at the peak wavelength P2 is 10% or more and 50% or less.   5. The optical sheet according to claim 1, wherein a content of the light absorber in the light absorption layer is 0.001 wt% or more and 2 wt% or less.   The optical sheet according to any one of claims 1 to 5, wherein an average thickness of the light absorption layer is 0.05 mm or more and 0.3 mm or less.   The optical sheet according to any one of claims 1 to 6, wherein the resin material is mainly polycarbonate. A substrate;
An optical component comprising: the optical sheet according to any one of claims 1 to 7, which is laminated on the base material.

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