JP6886150B2 - Optical element - Google Patents

Description

The present invention relates to an optical element capable of vividly seeing the green color of forests and flowers while reducing glare from sunlight.

Patent Document 1 describes an antiglare optical element as an optical element that reduces glare from sunlight. This antiglare optical element is made of a transparent base material, and the transparent base material contains an ultraviolet absorber and a specific wavelength absorbing dye, and the transmittance curve measured by a spectrophotometer shows 450 to 500 nm and 550 to 630 nm. The first valley minimum and the second valley minimum are provided in each wavelength range of. As a result, this anti-glare optical element selectively absorbs the wavelength range (400 to 500 nm) that adversely affects the body and the wavelength range (570 to 600 nm) that the human eye feels dazzling, and reduces the glare from sunlight. It is decreasing.

Japanese Unexamined Patent Publication No. 2013-11840

Traditionally, hiking and forest bathing have been enjoyed by people as familiar leisure activities due to growing health consciousness and growing interest in the natural environment. Sunglasses as an optical element are used when hiking or bathing in the forest to reduce glare from the sun. When wearing sunglasses, the user will appreciate the scenery, forests and flowers through the sunglasses. However, since the conventional antiglare optical element has the first valley minimum in the wavelength range of 450 to 500 nm, dullness (looks blackish) in the wavelength range (450 to 500 nm) including the green color of forests and flowers. It was something that could happen. When the green color of forests and flowers becomes dull, sunglasses users can see the forests, flowers and even the scenery including them dull, and there is a problem that the enjoyment of hiking and forest bathing is halved.

The present invention has been made in view of the above points, and an object of the present invention is to provide an optical element capable of vividly seeing the green color of forests and flowers while reducing glare from sunlight.

The optical element of the invention, the absorption curve measured by a spectrophotometer, a first absorbent crest having one or more absorption peaks in the first wavelength band 410～450Nm, second 530~610nm in the optical element has a second absorption crest having one or more absorption peaks in a wavelength band, and
The average absorption rate of the intermediate wavelength band of 450 to 530 nm between the first wavelength band and the second wavelength band is 50% or less, and the average absorption rate is 50% or less.
The average absorption rate of the first wavelength band width at a height of 0.8 times the absorption rate of the maximum absorption peak of the first absorption peak is 80% or more, and
It is characterized in that the average absorption rate of the second wavelength band width at a height of 0.6 times the absorption rate of the maximum absorption peak of the second absorption peak is 50 to 90%. is there.

According to the optical element of the present invention, since the first absorption peak portion is provided in the first wavelength band of 410 to 450 nm, it is possible to suitably absorb blue light (400 to 450 nm) that is strongly irritating to the eyes. it can. In addition, the human eye perceives light around 555 nm most strongly in the light-adapted state, and has a second absorption peak in the second wavelength band of 530 to 610 nm, so that it is dazzled by sunlight. It can be reduced. Furthermore, since the average absorption rate of the wavelength (450 to 530 nm) between the first wavelength band and the second wavelength band is 50% or less, the green color of forests and flowers can be clearly seen.

Here, in the above optical element, the central wavelength of the first wavelength band width can be assumed to be between 420 and 440 nm. According to this, blue light can be absorbed more preferably.

Further, in the above optical element, the central wavelength of the second wavelength band width can be assumed to be between 540 and 600 nm. According to this, the glare from sunlight can be further reduced.

Further, in the above optical element, the average absorptance of 480 to 530 nm in the intermediate wavelength band can be set to 40% or less. According to this, the green color of forests and flowers can be seen more vividly.

Further, in the optical element, the average absorptance of the second wavelength band width can be 50 to 90%. According to this, it is possible to further reduce the glare from sunlight while ensuring the visibility.

According to the optical element of the present invention, since the first absorption peak portion is provided in the first wavelength band of 410 to 450 nm, blue light can be suitably absorbed. Further, since the second absorption peak portion is provided in the second wavelength band of 530 to 610 nm, the glare from sunlight can be reduced. Furthermore, since the average absorption rate of the wavelength (450 to 530 nm) between the first wavelength band and the second wavelength band is 50% or less, the green color of forests and flowers can be clearly seen.

It is a figure which shows the absorption characteristic of FD-01. It is a figure which shows the absorption characteristic of FD-02. It is a figure which shows the absorption characteristic of FD-03. It is a figure which shows the absorption characteristic of FD-04. It is a figure which shows the absorption characteristic of FD-05. It is a figure which shows the absorption characteristic of FD-06. It is a figure which shows the absorption characteristic of FD-07. It is a figure which shows the 1st wavelength band and the 2nd wavelength band in the absorption rate curve of an optical element. In the first wavelength band, the absorption peak and the absorption peak portion is a diagram showing the relationship between the first wavelength band bandwidth and its center wavelength. In the second wavelength band, the absorption peak and the absorption peak portion is a diagram showing the relationship between the second wavelength band bandwidth and its center wavelength. It is a figure which shows the absorption rate curve of the optical element of Example 1. FIG. It is a figure which shows the absorption rate curve of the optical element of Example 2. It is a figure which shows the absorption rate curve of the optical element of Example 3. FIG. It is a figure which shows the absorption rate curve of the optical element of Example 4. FIG. It is a figure which shows the absorption rate curve of the optical element of the comparative example 1. FIG. It is a figure which shows the absorption rate curve of the optical element of the comparative example 2. It is a figure which shows the absorption rate curve of the optical element of the comparative example 3. FIG. It is a figure which shows the absorption rate curve of the optical element of the comparative example 4. It is a figure which shows the absorption rate curve of the optical element of the comparative example 5. It is a figure which shows the absorption rate curve of the optical element of the comparative example 6. (A) is an L * a * b * chromaticity change diagram showing the chromaticity change of the optical element of Example 1, and (b) is a chromaticity change diagram showing only the selected color among the colors. (A) is an L * a * b * chromaticity change diagram showing the chromaticity change of the optical element of Example 2, and (b) is a chromaticity change diagram showing only the selected color among the colors. (A) is an L * a * b * chromaticity change diagram showing the chromaticity change of the optical element of Example 3, and (b) is a chromaticity change diagram showing only the selected color among the colors. (A) is an L * a * b * chromaticity change diagram showing the chromaticity change of the optical element of Example 4, and (b) is a chromaticity change diagram showing only the selected color among the colors. (A) is an L * a * b * chromaticity change diagram showing the chromaticity change of the optical element of Comparative Example 1, and (b) is a chromaticity change diagram showing only the selected color among the colors. (A) is an L * a * b * chromaticity change diagram showing the chromaticity change of the optical element of Comparative Example 2, and (b) is a chromaticity change diagram showing only the selected color among the colors. (A) is an L * a * b * chromaticity change diagram showing the chromaticity change of the optical element of Comparative Example 3, and (b) is a chromaticity change diagram showing only the selected color among the colors. (A) is an L * a * b * chromaticity change diagram showing the chromaticity change of the optical element of Comparative Example 4, and (b) is a chromaticity change diagram showing only the selected color among the colors. (A) is an L * a * b * chromaticity change diagram showing the chromaticity change of the optical element of Comparative Example 5, and (b) is a chromaticity change diagram showing only the selected color among the colors. (A) is an L * a * b * chromaticity change diagram showing the chromaticity change of the optical element of Comparative Example 6, and (b) is a chromaticity change diagram showing only the selected color among the colors. It is the figure which plotted 24 colors of a color checker classic with a color number on a color wheel (a * b * coordinates). It is a figure which shows the color tone index V of the optical element of an Example and a comparative example.

Hereinafter, an embodiment of the present invention will be described. The optical elements of the embodiments, the absorption curve measured by a spectrophotometer, a first absorbent crest having one or more absorption peaks in the first wavelength band 410～450Nm, second 530~610nm It has a second absorption crest having one or more absorption peaks in a wavelength band, a. When the optical element contains a specific wavelength absorbing dye, the optical element has a first absorption peak portion and a second absorption peak portion .

In the optical element of the embodiment, an optical element molded from an organic glass base material as a spectacle lens will be described as an example. Of course, the present invention is not limited to the use of spectacle lenses, such as sunglasses, goggles, contact lenses, intraocular lenses, binocular lenses, telescope lenses, cameras (general-purpose cameras, video cameras, in-vehicle cameras, mobile terminal cameras, etc.). ), Window glass (for vehicles, aircraft, ships or buildings, etc.), display screens (for TVs, PCs or mobile terminals, etc.), lighting filters (for floodlights, interior lights or outdoor lights, etc.) It is possible to apply. The camera can be applied not only to the optical lens itself but also as a filter on the front surface (surface) of the light receiving element. The display screen can be applied not only to the display screen itself but also to the light source as a filter. As the light source including the use as an illumination filter, any light source such as a halogen lamp, a fluorescent lamp, an LED, and a standard light source can be used. Further, the base material forming the optical element is not limited to organic glass, and can be applied to inorganic glass as well.

The organic glass base material is used as a base material for an optical element such as a lens or a window glass, and the optical element of the embodiment is made of organic glass (plastic) because it is lighter than inorganic glass. Is preferable. As the organic glass base material, polycarbonate (PC) type, polyurethane type, aliphatic allyl carbonate type, aromatic allyl carbonate type, polythiourethane type, episulfide type, (meth) acrylate type, transparent polyamide (transparent nylon) type, Synthetic resins such as norbornen-based, polyimide-based, and polyolefin-based can be used. Among them, a thiourethane-based, episulfide-based or (meth) acrylate-based thermosetting resin raw material has a high refractive index, and therefore can be more preferably used. As the organic glass base material, a commercially available one can be used.

The thiourethane resin means a polymer (resin) having a bond (-NHCOS-, -NHCSO-, -NHCSS-) in which at least one oxygen atom of a polyurethane bond (-NHCOO-) is replaced with a sulfur atom. .. As the resin material, one or more isocyanate components selected from polyisocyanate, polyisothiocyanate, and polyisothiocyanate thioisocyanate, and one or more known active hydrogen compounds selected from polythiol and optionally polyols. A polymerizable component in combination with the component can be preferably used. Here, as the polyisocyanate, an aliphatic, alicyclic, aromatic and derivative thereof, and a sulfide / polysulfide / thiocarbonyl (thioketone) derivative in which sulfur is introduced into a part of their carbon chains are used as parent compounds. Can be mentioned. Of these, aliphatic or alicyclic polyisocyanates are desirable from the viewpoint of yellowing resistance. Similarly, the polythiol is an aliphatic compound, an alicyclic compound, an aromatic compound, a derivative thereof, and a sulfide / polysulfide / polythioether in which sulfur is introduced into a part of the carbon chain thereof as a parent compound. Can be mentioned. Of these, aliphatic or alicyclic polythiols are desirable from the viewpoint of yellowing resistance.

The episulfide resin means a polymer (resin) obtained by reacting a dithioepoxy compound with a curing agent and further, another polymerizable compound, and is obtained by curing a linear alkyl sulfide type dithioepoxy compound. Any known compound can be used. As the curing agent, amines, organic acids, or inorganic acids, which are ordinary curing agents for epoxy resins, can be used.

The organic glass base material absorbs a specific wavelength absorbing dye for expressing the first absorbing peak 16 and the second absorbing peak 26 (FIG. 8), a deterioration inhibitor for preventing resin deterioration of the organic glass, and ultraviolet rays. Types of organic glass include UV absorbers, internal mold release agents that improve the releasability from the mold that forms the lens shape, brewing agents that add bluish tint to organic glass, and hardeners that cure organic glass. Appropriate ones can be added accordingly.

The specific wavelength absorbing dye is an additive that absorbs light having a specific wavelength. By containing a specific wavelength absorbing dye, the optical element, for example, absorbs blue light and has an eyeball (retinal) protective function, and emits light near 555 nm, which the human eye feels brightest in light-adapted vision. It can be absorbed to reduce glare from sunlight. Commercially available products can be used as the specific wavelength absorber, and benzophenone type, diphenyl acrylate type, steric disorder amine type, salicylate ester type, benzotriazole type, hydroxybenzoate type, cyanoacrylate type, hydroxyphenyltriazine type, and porphyrin. A system, a phthalocyanine system, etc. can be used.

The optical element contains a specific wavelength absorbing dye having an absorption peak wavelength of 410 to 450 nm, so that the absorption peak 15 is formed in the first wavelength band 11 of 410 to 450 nm on the absorption rate curve measured by the spectrophotometer. Can have. As a result, the optical element can suitably absorb blue light.

As shown in FIG. 9, the shape of the absorption peak 15 of the absorption rate curve measured by the spectrophotometer is not a symmetrical shape, but the wavelength of the absorption peak 15 and the effective absorption width (first wavelength band bandwidth 12). ), There is a difference (wavelength deviation) from the center wavelength 13. Therefore, the specific wavelength absorbing dye is suitable for absorbing light having a wavelength before and after the central wavelength 13 of the effective absorption width (first wavelength band bandwidth 12), not before and after the wavelength of the absorption peak 15. Then, the first wavelength band bandwidth 12 is deviated (wavelength shift) depending on the height (magnification of the absorption rate) of the maximum absorption peak 15 of the first absorption peak portion 16 with respect to the absorption rate. Then, by measuring the magnification of the absorption rate as 0.8 times, the wavelength shift can be reduced, and the central wavelength 13 of the first wavelength band bandwidth 12 can be accurately obtained. It should be noted that the absorption rate magnification of 0.8 times can be used as an accurate index, but if the absorption rate magnification is in the range of 0.7 to 0.9 times, the effective absorption range can be used. An accurate absorption width can be shown. When the magnification of the absorption rate is less than 0.7, the height of the absorption rate for measuring the bandwidth becomes low, and the deviation of the effective absorption width may become large. On the other hand, if it exceeds 0.9 times, it becomes close to the wavelength of the absorption peak 15, and there is a possibility that the deviation of the effective absorption width becomes large.

The central wavelength 13 of the first wavelength band bandwidth 12 is between 420 and 440 nm, so that the optical element can more preferably absorb blue light. If the central wavelength of the first wavelength band bandwidth is less than 420 nm, the ultraviolet absorber described later and the absorption band may overlap, and blue light may not be absorbed efficiently. On the other hand, if it exceeds 440 nm, it may enter the region of the green wavelength of forests and flowers, and the green of forests and flowers may not be seen vividly. The center wavelength 13 of the first wavelength band bandwidth 12 is more preferably 430 to 440 nm.

By containing a specific wavelength absorbing dye having an absorption peak wavelength of 530 to 610 nm, the optical element has an absorption peak 25 in the second wavelength band 21 of 530 to 610 nm on the absorption rate curve measured by the spectrophotometer. Can have. Thereby, the optical element can reduce the glare from sunlight, and has an absorption peak at the wavelength (450 to 530 nm) between the first wavelength band 11 and the second wavelength band 21 described above. Since the average absorption rate is 50% or less, the green color of forests and flowers can be seen vividly. In particular, when the average absorption rate in the wavelength range of 480 to 530 nm is 40% or less, the green color of forests and flowers can be seen more vividly. Further, since the average absorption rate in the wavelength range of 450 to 500 nm is 50% or less, the blue sky (the color of the sky in fine weather) can be clearly seen without dullness. Further, since the average absorption rate in the wavelength range of 480 to 530 nm is 40% or less, the sea (particularly the color of the sea in fine weather) can be clearly seen without dullness.

The shape of the absorption peak 25 of the absorption rate curve measured by the spectrophotometer is not a symmetrical shape as shown in FIG. 10, and the absorption peak 25 is indicated by reference numerals 25a, 25b, 25c. , There may be more than one. Therefore, there is a difference (wavelength shift) between the wavelength of the absorption peak 25 having the highest absorption rate and the center wavelength 23 of the effective absorption width (second wavelength band bandwidth 22). Therefore, the specific wavelength absorbing dye is suitable for absorbing light having a wavelength before and after the center wavelength 23 of the effective absorption width (second wavelength band bandwidth 22), not before and after the absorption peak wavelength 25. Then, the second wavelength band bandwidth 22 is deviated depending on the height (magnification of the absorption rate) of the maximum absorption peak 25 of the second absorption peak portion 26 with respect to the absorption rate. Then, by measuring the magnification of the absorption rate as 0.6 times, the wavelength shift can be reduced, and the center wavelength 23 of the second wavelength band bandwidth 22 can be accurately obtained. It should be noted that the absorption rate magnification of 0.6 times can be used as an accurate index, but if the absorption rate magnification is in the range of 0.5 to 0.7 times, the effective absorption range can be used. An accurate absorption width can be shown. If the magnification of the absorption rate is less than 0.5, the height of the absorption rate for measuring the bandwidth becomes low, and the deviation of the effective absorption width may become large. On the other hand, if it exceeds 0.7 times, a part of a plurality of absorption peak wavelengths may be captured, and the deviation of the effective absorption width may become large.

Then, when the central wavelength 23 of the second wavelength band bandwidth 22 is between 540 and 600 nm, the optical element can reduce the glare from sunlight. If the central wavelength 23 of the second wavelength band bandwidth 22 is less than 540 nm, it may enter the region of the green wavelength of forests and flowers, and the green of forests and flowers may not be seen vividly. On the other hand, if it exceeds 600 nm, the glare from sunlight may not be sufficiently reduced. The center wavelength 23 of the second wavelength band bandwidth 22 is more preferably 558 to 571 nm. The average absorption rate of the second wavelength band bandwidth 22 is preferably 50 to 90%. According to this, it is possible to further reduce the glare from sunlight while ensuring the visibility. If the average absorption rate of the second wavelength band bandwidth 22 is less than 50%, it may not be possible to reduce the glare from sunlight. On the other hand, if it exceeds 90%, the field of view may not be secured. More preferably, the average absorption rate of the second wavelength band width 22 is 55 to 80%, and even more preferably 60 to 75%.

The ultraviolet absorber is an additive that absorbs ultraviolet rays, and is added to an optical element to protect the eyeball. This is because ultraviolet rays may cause cataracts and macular degeneration when they enter the eyes. It also functions as a deterioration inhibitor depending on the absorption wavelength range of the ultraviolet absorber. Examples of the ultraviolet absorber include benzophenone type, diphenyl acrylate type, steric hindrance amine type, salicylate ester type, benzotriazole type, hydroxybenzoate type, cyanoacrylate type, hydroxyphenyltriazine type and the like.

The deterioration inhibitor is an alkyl radical (R .: R) generated when the resin of organic glass is decomposed and deteriorated by light or heat while absorbing light of 280 to 320 nm, which is easily decomposed and deteriorated by the resin of organic glass. By capturing or decomposing (alkyl chains), peroxy radicals (ROO ·), and peroxides (ROOH), the deterioration of the resin is suppressed from accelerating. Examples of the deterioration inhibitor include benzophenone type, diphenyl acrylate type, steric hindrance amine type, salicylate ester type, benzotriazole type, hydroxybenzoate type, cyanoacrylate type, hydroxyphenyltriazine type and the like. As the deterioration inhibitor, an agent suitable for the type of organic glass can be added. It also functions as an ultraviolet absorber depending on the absorption wavelength range of the deterioration inhibitor.

The internal mold release agent is an additive added to improve the release from the mold when the organic glass base material is molded from the organic glass using the mold and then removed from the mold. As the agent, one suitable for the material of organic glass can be used.

A curing agent is an additive that cures (polymerizes) organic glass that forms an organic glass substrate, and can be used as a material for organic glass such as tin-based catalysts, amine-based catalysts, and peroxide-based polymerization initiators. Suitable ones can be used.

The method for manufacturing the optical element of the embodiment will be described below. For the organic glass base material, for example, in the case of a thiourethane resin, an isocyanate compound, a thiol compound, and a polyol compound are mixed, and a specified specific wavelength absorbing dye or the like and other additives (molecular weight adjusting agent, curing agent, etc.) are mixed. And stir. Subsequently, it is degassed and filtered to obtain a resin raw material for forming an organic glass base material.

For molding the organic glass base material, a general molding method such as a polishing method or a casting molding method can be used. The polishing method is a method in which a resin raw material for molding an organic glass base material is molded into a block-shaped resin under suitable conditions, and then polished according to a lens design for which a block-shaped resin is required. In the casting molding method, taking a concave-convex lens as an example, the peripheral surface of the mold is sealed with a taping or a gasket at a space requiring a concave mold and a convex mold to form a cavity. This is a method in which a resin raw material for molding an organic glass base material is injected and cured, and the organic glass base material is polished if necessary. In either case, the optical element of the embodiment can be obtained, but molding with a small amount of waste of the resin raw material is more preferable.

Further, for the organic glass base material (optical element), hard coat processing, dimming processing, polarization processing, multilayer film (antireflection film, mirror film) processing, antistatic processing, antifogging treatment, which are generally performed, are performed. General-purpose surface treatment such as processing and water-repellent treatment can be appropriately applied.

The method of obtaining the color tone index V will be described below.

The color tone index V is an index that can be said that the larger the value, the smaller the dullness.
_{^{V = 100 × (μC * SC}} -μC * SW) / (μC * RC -μC * RW)
Represented by.

Note that μC ^* _SC is the average value of the saturation of ^{a plurality of chromatic colors measured by transmitting an optical element, and μC *} _SW is the average of the saturations of a plurality of achromatic colors measured by transmitting an optical element. ΜC ^* _RC is the average value of the saturation of multiple chromatic colors measured by passing through an ND (Neutral Density) filter that has the same visual transmittance as the optical element, and μC ^* _RW is the ND filter. It is the average value of the saturation of a plurality of achromatic colors measured by transmitting. The saturation is the saturation (C ^* = (a ^{* 2} + b ^{* 2} ) ^1/2 ) ^{obtained using L *} a ^* b ^{* (CIE 1976).} The visual transmittance is a visual transmittance obtained from the Y value of the visual transmittance τV (JIS T 7333) and the XYZ color system (JIS Z 8701). These values can be measured and obtained by a spectrophotometer or the like described later. The CIE standard light source D65 was used as the light source.

For a plurality of chromatic colors and a plurality of achromatic colors, for example, a color tone index V can be obtained by using a color randomly selected from a color sample book issued by the Japan Paint Manufacturers Association, but L ^* a ^* b ^{* It} is preferable to select a color in which the colors are evenly scattered in the color scheme chromaticity diagram (color wheel). As a selection of colors in which colors are evenly scattered on the color wheel, for example, there is a color scheme of 24 colors of Color Checker Classic (manufactured by X-Rite).

In the color checker classic color scheme, there are multiple chromatic colors, 18 colors (1 (dark skin color), 2 (light skin color), 3 (blue sky), 4 (leaf), 5 (blue flower), 6 (blue-green), 7 (orange), 8 (blue-purple), 9 (gentle red), 10 (purple), 11 (yellow-green), 12 (yellow-orange), 13 (blue), 14 (green), 15 (red), 16 (Yellow), 17 (magenta), 18 (cyan)) are used, and it can be seen from FIG. 31 that 18 colors are evenly scattered on the color wheel. FIG. 31 is a diagram in which points obtained from a ^* and b ^{* of L *} a ^* b ^* are plotted together with color numbers for 18 chromatic colors on the color wheel ^{(a *} b ^{* coordinates).} 18 chromatic colors and 6 achromatic colors from white to black (19 (white), 20 (n8), 21 (n6.5), 22 (n5), 23 (n3.5), 24 (n2)) ) Can be added to cover 18 colors evenly scattered on the color wheel and 6 achromatic colors from white to black. With these 24 colors, the color tone index V of the color over the entire color wheel can be confirmed. be able to. In FIG. 31, the six achromatic colors are plotted so as to overlap near the origin of the graph because they are achromatic.

In addition, for multiple chromatic colors, five selected colors of Color Checker Classic 3 (blue sky), 6 (blue-green), 9 (gentle red), 15 (red), and 18 (cyan) are used, and multiple colors are used. Uses 6 selected colors of Color Checker Classic 19 (white), 20 (n8), 21 (n6.5), 22 (n5), 23 (n3.5), 24 (n2) for the achromatic color of. By doing so, the color wheel (12 o'clock is + b ^* (yellow direction), 6 o'clock is -b ^* (blue direction), 3 o'clock is + a ^* (red direction), and 9 o'clock is -a ^* (green direction). It is possible to cover the color from the direction of about 2 o'clock to the direction of about 8 o'clock (hereinafter referred to as the forest adaptive color direction) through the center (FIGS. 21 to 30 (b)). The colors covered by this correspond to the greens of forests and flowers and their complementary colors. By measuring these 11 colors, it is possible to easily confirm the color tone index V centered on the color in the forest adaptive color direction.

Hereinafter, the present invention will be described in more detail with reference to Examples. As the ultraviolet absorber, the specific wavelength absorbing dye, and the ordinary dye for comparison with the specific wavelength absorbing dye, those described below were used.

<UV absorber>
UV-01: 2- (2H-benzotriazole-2-yl) -6- (1-methyl-1-phenylethyl) -4- (1,1,3,3-tetramethylbutyl) phenol UV-02: 2- (2-Hydroxy-5-t-butylphenyl) -2H-benzotriazole These were commercially available products.

<Specific wavelength absorption dye>
FD-01: Phthalocyanine-based specific wavelength absorbing dye (absorption peak wavelength: 435 nm, absorption coefficient: 350 L / g · cm, absorption characteristic diagram: shown in FIG. 1)
FD-02: Tetraazaporphyrin compound-based specific wavelength absorption dye (absorption peak wavelength: 575 nm, extinction coefficient: 45 L / g · cm, absorption characteristic diagram: shown in FIG. 2)
FD-03: Tetraazaporphyrin compound-based specific wavelength absorption dye (absorption peak wavelength: 585 nm, absorption coefficient: 70 L / g · cm, absorption characteristic diagram: shown in FIG. 3)
FD-04: Tetraazaporphyrin compound-based specific wavelength absorption dye (absorption peak wavelength: 560 nm, absorption coefficient: 160 L / g · cm, absorption characteristic diagram: shown in FIG. 4)
FD-05: Tetraazaporphyrin compound-based specific wavelength absorption dye (absorption peak wavelength: 480 nm, absorption coefficient: 160 L / g · cm, absorption characteristic diagram: shown in FIG. 5)
FD-06: Tetraazaporphyrin compound-based specific wavelength absorption dye (absorption peak wavelength: 595 nm, absorption coefficient: 40 L / g · cm, absorption characteristic diagram: shown in FIG. 6)
FD-07: Phthalocyanine-based specific wavelength absorbing dye (absorption peak wavelength: 765 nm, absorption coefficient: 350 L / g · cm, absorption characteristic diagram: shown in FIG. 7)
As these, commercially available products are used, and figures showing absorption characteristics are shown in FIGS. 1 to 7.

<Normal pigment>
ND-01: Oil Yellow 108 (absorption peak wavelength: 410 nm)
ND-02: Solvent Red 52 (absorption peak wavelength: 540 nm, CAS No. 81-39-0)
ND-03: Solvent Violet 33 (absorption peak wavelength: 590 nm, CAS No. 86090-40-6)
ND-04: Dialesin Block B (absorption peak wavelength: 610 nm)
For these, commercially available products were used.

A thiourethane resin having a refractive index of 1.60 was used as the organic glass base material (optical element), and the dye used was changed for each example to prepare the resin raw material as follows. A list of dyes used for each example is shown in Table 1. The “parts” described in Table 1 and the following are parts by mass. 2,5 (or 2,6) -bicyclo [2,2,1] heptambis (methylisocyanate): 49.7 parts, dibutyltin dichloride: 0.05 parts as a curing agent, alkyl phosphate ester (alcohol C8 ~) as an internal release agent C12) Salt: 0.1 part, 2- (2H-benzotriazole-2-yl) -6- (1-methyl-1-phenylethyl) -4- (1,1,3,3-tetramethyl) as an ultraviolet absorber Butyl) phenol: 2.0 parts, 2- (2-hydroxy-5-t-butylphenyl) -2H-benzotriazole as an ultraviolet absorber: 2.0 parts, the dyes shown in Table 1 were added, and the liquid temperature was 15 ° C. The mixture was sufficiently stirred for 1 hour in a nitrogen gas atmosphere. Then, a polythiol composition containing 4,7 (5,7 or 4,8) -bis (mercaptomethyl) -3,6,9-trithio-1,11-undecandithiol: 29.5 parts was added, and further. Pentaerythritol tetrakis (3-mercaptopropionate): 24.4 parts was added, and the mixture was further mixed and stirred for 1 hour in a nitrogen gas atmosphere while adjusting the temperature to 15 ° C. Subsequently, after degassing for 1 hour while stirring at a liquid temperature of 15 ° C. and 133 Pa using a vacuum pump, filtration is performed with a 1 μm filter to form a thiourethane-based liquid resin lens base material having a refractive index (ne) of 1.60. A resin raw material was prepared.

The organic glass base material is molded by the first mold (glass, outer diameter 80 mm, used surface curvature 66.16 mm, center thickness 4.0 mm), second mold (glass, outer diameter 80 mm, used surface curvature 65.59 mm, center). A molding die was prepared by winding an adhesive tape so that the center spacing was 2.0 mm (thickness 4.0 mm). As the adhesive tape, a 6263-02 adhesive tape manufactured by Sliontec in which a silicone-based adhesive was applied on a 38 μm thick PET film was used. After injecting the above resin raw material into the above molding mold, it was heated under the following temperature conditions for polymerization. Heating temperature conditions: 35 ° C x 5 hours → temperature rise from 35 ° C to 60 ° C over 5 hours → temperature rise from 60 ° C to 100 ° C over 2 hours → temperature rise from 100 ° C to 120 ° C over 1 hour → 120 ° C. × 3 hours → Cooled from 120 ° C. to 40 ° C. over 4 hours. The resin raw material (organic glass base material) cured from the mold after the polymerization was taken out, and the organic glass base material as an optical element was used as an evaluation sample.

For the optical elements, the optical elements (organic glass base material) of Examples and Comparative Examples were prepared by combining dyes (specific wavelength absorbing dyes, ordinary dyes), and for these, the absorption rate curve was obtained as the optical characteristic evaluation performance. As an evaluation of the hue shift, the chromaticity change diagram (24 colors) on the hue circle and the chromaticity change diagram (11 colors) on the hue circle are measured, and the color change diagram (11 colors) on the hue circle is used. The hue index V was obtained as an evaluation of dullness. The methods and results of these evaluations and measurements are described below.

<Absorption rate curve>
The absorption rate curve (absorption rate of the optical element with respect to light for each wavelength) was determined in accordance with the following devices and standards. The measurement conditions were a measurement wavelength: 380 to 780 nm, a scan speed: 600 nm / min, a sampling interval of 1 nm (displayed at 5 nm intervals in the absorption rate curve (FIGS. 11 to 20)), and a slit of 5 nm. Since the measurement position is a measurement of optical characteristics, it is set as the geometric center of the optical element.
-Device: Spectrophotometer U-4100 (manufactured by Hitachi High-Tech Science Corporation)
-Standard: Specifications and test method of transmittance of spectacle lenses for refraction correction (JIS T 7333: 2005)
The absorption rate curves of the optical elements of Examples 1 to 4 are shown in FIGS. 11 to 14, and the absorption rate curves of the optical elements of Comparative Examples 1 to 6 are shown in FIGS. 15 to 20. From these absorption rate curves, the absorption rate of the maximum absorption peak 15 of the first absorption peak portion 16 is read, the first wavelength band bandwidth 12 and its central wavelength 13 are obtained, and the average absorption rate of the first wavelength band bandwidth 12 is obtained. Was read. Similarly, reading the maximum absorption rate of the absorption peak 25 of the second absorption crest 26, a second wavelength band bandwidth 22 and the center wavelength 23 determined, was read average absorptance of the second wavelength band bandwidth 22 .. Table 2 shows the center wavelength 13 and the average absorption rate of the first wavelength band width 12 and the center wavelength 23 and the average absorption rate of the second wavelength band bandwidth 22.

From FIGS. 11 to 14, the optical elements of Examples 1 to 4 have a first absorption peak 16 having one or more absorption peaks 15 in the first wavelength band 11 of 410 to 450 nm, and a second wavelength of 530 to 610 nm. It can be confirmed that the band 21 has a second absorption peak portion 26 having one or more absorption peaks 25. The wavelength between the first wavelength band 11 and the second wavelength band 21 (450 to 530 nm) does not have an absorption peak and has an average absorption rate of 50% or less, particularly in the wavelength range of 480 to 530 nm. With an average absorption rate of 40% or less, the green color of forests and flowers could be seen vividly. Further, since the average absorption rate in the wavelength range of 450 to 500 nm is 50% or less, the blue sky (the color of the sky in fine weather) can be clearly seen without dullness. Further, since the average absorption rate in the wavelength range of 480 to 530 nm was 40% or less, the sea (particularly the color of the sea in fine weather) could be clearly seen without dullness.

From Table 2, in the optical elements of Examples 1 to 4, the central wavelength 13 of the first wavelength band width 12 is between 420 and 440 nm, and the average absorption rate of the first wavelength band width 12 is 80% or more. Therefore, it was possible to suitably absorb blue light. Further, since the center wavelength 23 of the second wavelength band width 11 is between 540 and 600 nm and the average absorption rate of the second wavelength band width 22 is 50 to 90%, sunlight is secured while ensuring visibility. It was possible to further reduce the glare from the sun.

However, it was confirmed that the optical elements of Comparative Examples 1 to 6 did not satisfy these conditions. Since all the optical elements of Examples 1 to 4 and Comparative Examples 1 to 6 contained an ultraviolet absorber, they absorbed 99% or more of ultraviolet rays (400 nm or less).

<Saturation change diagram in the color wheel (24 colors)>
In the chromaticity change diagram in the color wheel, one color of the color checker classic is measured by transmitting the optical element of the example, and ^{the value (changed color) of the L *} a ^* b ^* (CIE 1976) system is obtained. , The color was measured by passing through an ND filter having the same visual transmittance as the optical element of the example, and ^{the value of the L *} a ^* b ^* system (reference color with the same brightness) was obtained. Then, on the hue circle, the reference color and the point where the a ^* b ^* of the combined lightness, plotting the point at which the changed color of the a ^* b ^*, was changed in terms of the reference colors combined lightness color The change to the point is connected by an arrow, and the change in color can be confirmed on the color wheel. This was performed for all 24 colors of the color checker classic, represented in the same figure, and used as a chromaticity change diagram (24 colors) in the color wheel. The color measurement was performed using the following devices and standards, and the measurement position was the geometric center of the optical element because it was a measurement of optical characteristics.
-Device: Spectrophotometer CM-3600A (manufactured by Konica Minolta)
-Standards: Color measurement-Part 4: CIE 1976L ^* a ^* b ^* Color space (JIS Z 8781-4: 2013), Transmittance specifications and test methods for refraction correction spectacle lenses (JIS T 7333: 2005), Color display method-XYZ color system and X ₁₀ Y ₁₀ Z ₁₀ color system (JIS Z 8701: 1999)
The chromaticity change diagram (24 colors) of the optical elements of Examples 1 to 4 in the hue circle is shown in FIG. 21-24 (a), and the chromaticity of the optical elements of Comparative Examples 1 to 6 in the hue circle is shown. The change diagram (24 colors) is shown in FIG. 25 to 30 (a).

From FIGS. 21 to 24 (a), it was confirmed that the optical elements of Examples 1 to 4 had improved saturation in the forest-adapted color direction, and the green color of the forest and flowers could be clearly seen. On the other hand, from FIGS. 25 to 30 (a), the optical elements of Comparative Examples 1 to 6 do not have improved saturation in the forest adaptive color direction, and the green color of the forest or flowers looks dull. It could be confirmed.

<Characteristic change of chromaticity in the color wheel (11 colors)>
From the chromaticity change diagram (24 colors) in the above color wheel, 5 chromatic colors of 3 (blue sky), 6 (blue-green), 9 (gentle red), 15 (red), 18 (cyan) A total of 11 selected colors and 6 achromatic selected colors of 19 (white), 20 (n8), 21 (n6.5), 22 (n5), 23 (n3.5), and 24 (n2). Only plotted.

The chromaticity change diagram (11 colors) of the optical elements of Examples 1 to 4 in the hue circle is shown in FIG. 21-24 (b), and the chromaticity of the optical elements of Comparative Examples 1 to 6 in the hue circle is shown. The change diagram (11 colors) is shown in (b) of FIGS. 25 to 30.

Since the colors are extracted from the chromaticity change diagram (24 colors) on the color wheel, the result is the same as the result of the chromaticity change diagram (24 colors) on the color wheel, but there are 11 colors. However, it was possible to confirm the change in color in the forest-adapted color direction of the hue circle, and to judge whether or not the green color of the forest and flowers could be seen vividly.

<Color tone index V>
^{From the value of L *} a ^* b ^* obtained in the chromaticity change diagram (11 colors) in the above color wheel, the saturation (C ^* = (a ^{* 2} + b ^{* 2} ) ^1/2 ) is obtained, and the following Obtained from the formula.
Color tone index V = 100 × (μC ^* _SC- ^{μC *} _SW ) / (μC ^* _RC- ^{μC *} _RW )
Note that μC ^* _SC is the average value of the saturation of the selected colors of the five chromatic colors measured by transmitting the optical element, and μC ^* _SW is the six achromatic colors measured by transmitting the optical element. ^{ΜC *} _RC is the average value of the saturation of the selected colors, and μC * RC is the average value of the saturation of the selected colors of the five chromatic colors measured by passing through an ND filter that has the same visual transmittance as the optical element. Yes, μC ^* _RW is the average value of the saturation of the selected colors of the six achromatic colors measured by passing through the ND filter.

A diagram showing the color tone index V of the optical elements of Examples 1 to 4 and Comparative Examples 1 to 6 is shown in FIG.

From the result of the chromaticity change diagram (11 colors) in the color wheel and the value of the chromaticity index V in FIG. 32, the value of the chromaticity index V of Examples 1 to 4 in which the saturation is improved in the forest adaptation color direction is 80 or more. The value of the color tone index V of Comparative Examples 1 to 6 in which the saturation is not improved in the forest adaptive color direction is less than 80. When the value of the color tone index V was 80 or more, it was confirmed that the green dullness of the forest and flowers of the optical element was reduced. Further, since the color tone index V can be obtained by measuring the selected colors of 11 colors, it was confirmed that the color tone index V and the green dullness of forests and flowers can be easily reduced.

11 ... first wavelength band, 12 ... first wavelength band bandwidth, 13 ... central wavelength, 15 ... absorption peak, 16 ... absorption peak portion, 21 ... first wavelength band, 22 ... second wavelength band bandwidth, 23 ... center wavelength, 25,25a, 25b, 25c ... absorption peak, 26 ... absorption Yamabe.

Claims (4)

Absorption curve measured by a spectrophotometer, a first absorbent crest having one or more absorption peaks in the first wavelength band 410～450Nm, one or more the second wavelength band of 530~610nm in the optical element has a second absorption crest having an absorption peak, and
The average absorption rate of the intermediate wavelength band of 450 to 530 nm between the first wavelength band and the second wavelength band is 50% or less, and the average absorption rate is 50% or less.
The average absorption rate of the first wavelength band width at a height of 0.8 times the absorption rate of the maximum absorption peak of the first absorption peak is 80% or more, and
The average absorption rate of the second wavelength band width at a height of 0.6 times the absorption rate of the maximum absorption peak of the second absorption peak is 50 to 90%.
An optical element characterized by that. The optical element according to claim 1, wherein the central wavelength of the first wavelength band bandwidth is between 420 and 440 nm. The optical element according to claim 1 or 2 , wherein the central wavelength of the second wavelength band width is between 540 and 600 nm. The optical element according to any one of claims 1 to 3, wherein the average absorptance of 480 to 530 nm in the intermediate wavelength band is 40% or less.

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