JPH09281317A - Optical member having wavelength selectivity - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical member having wavelength selectivity without damaging the hue of a base material such as a dyed lens for glasses due to reflected light. SOLUTION: The dyed lens 1 has such spectral transmittance that the absorptance for a blue component in the shorter wavelength region than the border wavelength between blue and green is lower than the absorptance for a green and red component in the longer wavelength region and that the transmittance for the blue component is relatively high. The antireflection film 2 has such spectral reflectance that the reflectance for the blue component in the shorter wavelength region than the border wavelength between blue and green is higher than the reflectance for the green and red component in the longer wavelength region.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical member such as a dyed spectacle lens having a function of selecting a wavelength of a transmitted light beam.

[0002]

2. Description of the Related Art A dyed lens for spectacles of this type is manufactured by impregnating a plastic base material forming a lens with a dye capable of absorbing a specific color component. When the spectacle lens is composed of only the base material, the color stimulus of the transmitted light entering the eye of the spectacle lens wearer, and the transmitted light entering the eye of the person other than the wearer through the spectacle lens from the eye side. Color stimulation,
That is, it is equal to the color stimulus recognized as the color of the lens.

On the other hand, an eyeglass lens is generally coated with an antireflection film on the lens surface in order to prevent reflection on the lens surface. The antireflection film is an interference film that is usually composed of a plurality of dielectric layers, and it is possible to almost completely prevent the generation of reflected light with respect to the reference center wavelength.
The reflectance cannot be 0% at all wavelengths in the visible range. Conventionally, an antireflection film having a spectral reflectance distribution such that the reflectance of the green component is relatively high regardless of the color of the substrate has been generally used.

[0004]

However, conventionally, no attention is paid to the relationship between the color stimulus of the transmitted light of the base material of the spectacle lens and the color stimulus of the reflected light by the antireflection film.
Due to the reflected light from the anti-reflection film, the spectacle lens looks like a color different from the originally intended color of the base material, and particularly when the color stimuli of both are unbalanced, it looks cloudy. There is a problem that the fashionability is impaired.

The present invention has been made in view of the above problems, and an optical member having a wavelength selectivity that does not impair the hue of a base material such as a spectacle lens dyed with a color imparted by reflected light. The purpose is to provide.

[0006]

In order to achieve the above-mentioned object, an optical member having wavelength selectivity according to the present invention has a base material which mainly transmits a component in a specific wavelength range of a visible wavelength range, and a base material. In the optical member composed of the coating layer applied to the surface of the substrate, the spectral transmittance distribution of the base material caused by the difference in the absorptance depending on the wavelength and the spectral reflectance distribution of the coating layer should be made to substantially match. Is characterized by.

That is, the substrate has a lower absorption rate for blue components on the shorter wavelength side than the blue-green boundary wavelength than that for green and red components on the long wavelength side, and a relatively high transmittance for the blue component. When the coating layer has a reflectance distribution, the coating layer has a spectral reflectance distribution such that the reflectance for the blue component on the short wavelength side of the blue-green boundary wavelength is higher than the reflectance for the green and red components on the long wavelength side. .

In addition, the substrate has a spectral absorption factor in which the absorption rate for the red component on the long wavelength side of the red-green boundary wavelength is lower than that for the green and blue components on the short wavelength side and the transmittance of the red component is relatively high. When it has a transmittance distribution, the coating layer has a spectral reflectance such that the reflectance for the red component on the long wavelength side of the red-green boundary wavelength is higher than the reflectance for the green and blue components on the short wavelength side. .

With such a structure, even when a coating layer such as an antireflection film is provided, the color stimulus of the reflected light substantially matches the color stimulus of the light transmitted through the base material, and the target is, for example, a spectacle lens. In this case, it is possible to match the color stimulus of the transmitted light seen by the wearer when white light is made incident with the color stimulus of the lens seen by a person other than the wearer by the light reflected by the surface.

When the color stimuli of the light transmitted through the base material and the light reflected by the coating layer are made to coincide with each other, it is desirable that the values of the dominant wavelength or the dominant wavelength of the complementary color are substantially in the same range.
The dominant wavelength and the complementary wavelength are the elements obtained by removing the purity from the chromaticity, and the chromaticity of the target light is equalized by the additive color mixture of the achromatic stimulus and the monochromatic light stimulus on the spectrum locus of the CIE chromaticity coordinates. In this case, the wavelength of the monochromatic light stimulus is the dominant wavelength, and the wavelength of the monochromatic light stimulus in the case where the target light and the monochromatic stimulus are equalized to a specific achromatic stimulus by the additive color mixture is the complementary dominant wavelength.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an optical member having wavelength selectivity according to the present invention will be described below. The optical member having wavelength selectivity of the invention is, for example, a spectacle lens as shown in FIG. 1A, or a flat plate having no power as shown in FIG. Used as a board.

In FIG. 1 (A), reference numeral 1 is a dyed lens as a base material that mainly transmits a component in a specific wavelength range of the visible wavelength range, and 2 is a coating layer applied to the surface of the dyed lens 1. Is an antireflection film. The dyeing lens 1 is formed by penetrating or mixing a dye so that the absorptance has wavelength dependency, that is, the white light transmitted through the dyeing lens 1 has a specific color. On the other hand, the antireflection film 2 is an interference film formed by laminating dielectrics, and each layer is matched with the spectral transmittance distribution of the dyeing lens 1 so that the color stimuli of the transmitted light and the reflected light are substantially equal to each other. The refractive index, the film thickness, etc. of are determined.

In the dyed lens 1 of this example, the absorptivity for the blue component on the short wavelength side of the blue-green boundary wavelength is lower than the absorptivity for the green and red components on the long wavelength side, and the transmittance of the blue component is relatively large. The antireflection film 2 has a high spectral transmittance,
It has a spectral reflectance such that the reflectance for the blue component on the shorter wavelength side than the blue-green boundary wavelength is higher than the reflectance for the green and red components on the longer wavelength side.

Therefore, the antireflection film 2 on the left side in the figure
When the white light Li (w) is incident from the side, most of the light flux is not reflected by the action of the antireflection film 2 and is incident on the dyeing lens 1, but only the blue light flux is slightly reflected light Lr (b). As reflected. In the spectral distribution of the light flux Lt (b) that has passed through the dyeing lens 1, the brightness of the blue component becomes relatively large due to the absorption of the green and red components in the dyeing lens 1. The difference in the absorption coefficient depending on the wavelength in the dyeing lens 1 is set to be significantly larger than the difference in the reflection coefficient of the antireflection film 2 depending on the wavelength.
Therefore, although the brightness of the blue component of the light flux incident on the dyeing lens 1 is slightly lowered by the antireflection film 2 as compared with the green and red components, the change in the spectral distribution due to the action of the antireflection film 2 causes the transmitted light Lt (b The spectral distribution of the transmitted light Lt (b) is determined mainly by only the spectral transmittance distribution of the dyeing lens 1, and the brightness of the blue component becomes relatively high.

If the dyed lens constructed as described above is used, as a spectacle lens, a color stimulus of light that passes through the lens and enters the eye of the wearer, and a person other than the wearer who sees the light reflected by the lens is used. It is possible to match the color stimulus of the lens seen by a person.

In FIG. 1B, reference numeral 10 is a glass plate as a flat base material, which is dyed so that the transmittance of a component in a specific wavelength range is larger than that of other components. Reference numeral 20 is an antireflection film as a coating layer provided on the glass plate 10, and is configured so that the color stimuli of the transmitted light and the reflected light are substantially equal to each other in accordance with the spectral transmittance distribution of the glass plate 10. Has been done. The operation when white light Li (w) is incident is similar to the example of the spectacle lens shown in FIG. 1 (A), and the reflected light Lr (b) from the antireflection film 20 has a relative blue component luminance. Since the luminous flux Lr (b) transmitted through the glass plate 10 is relatively high, the luminance of the blue component is relatively high.

In the above two embodiments, the blue component has a relatively high luminance in the spectral distribution of the reflected light and the transmitted light, but similarly, the red component has a relatively high luminance. It can also be configured to be high.

[0018]

EXAMPLES Next, specific examples of the optical member having wavelength selectivity based on the above embodiment will be described. Here, Example 1 in which an antireflection film having a relatively high reflectance with respect to a blue component is provided on a plastic dyeing lens which is a base dyed in blue, and a dyeing made of plastic dyed in red Example 2 in which an antireflection film having a relatively high reflectance for the red component is provided on the lens will be described in order. In this specification, CIE 1931
The color characteristics of each optical element are displayed using the standard color system, and the white light source at this time has a correlated color temperature of about 677.
A standard light source C of 4K is used.

Table 1 below shows the film constitution of the antireflection film of Example 1. The first layer is a layer in contact with the dyed lens, and the seventh layer is a layer in contact with air.

[0020]

[Table 1] Center wavelength λ = 550 nm Layer number Material name Optical thickness 1 SiO2 0.150 λ / 4 2 TiO2 0.237 λ / 4 3 SiO2 0.392 λ / 4 4 TiO2 0.759 λ / 4 5 SiO2 0.145 λ / 4 6 TiO2 0.678 λ / 4 7 SiO2 1.066 λ / 4

The optical characteristics of the antireflection film of Example 1 having the above film structure will be described. Comprehensively looking at the reflectance of the antireflection film in the entire visible region, the luminous reflectance, which is the ratio of the reflected light flux to the incident light flux, is 3%. The chromaticity of the reflected light is x = 0.1790, y on the CIE chromaticity coordinate.
= 0.1913. This color stimulus is color-matched by additive color mixing with an achromatic stimulus and a monochromatic light stimulus with a dominant wavelength of 477.5 nm on the spectrum locus of the CIE chromaticity coordinates. The purity is 62.69%. In addition, the complementary main color wavelength showing the wavelength of the monochromatic light stimulus that is color-matched with the achromatic stimulus by being mixed with the color stimulus of the reflected light is 577.4 nm. The spectral reflectance distribution of the antireflection film of Example 1 is shown in FIG.
The position in the E chromaticity coordinate is shown in FIG.

As for the optical characteristics of the dyed lens used in Example 1, the luminous reflectance is 59.7%, and the chromaticity of transmitted light is CIE chromaticity coordinates x = 0.209, y = 0.288.
0, dominant wavelength is 481.6 nm, complementary dominant wavelength is 582.1
nm, the stimulus purity of the chromaticity of transmitted light with respect to the dominant wavelength is 17.
29%. The spectral transmittance distribution of the dyed lens itself of Example 1 is shown by the solid line in FIG. 3, and the position of the transmitted light in the CIE chromaticity coordinate is shown in FIG. Further, a comprehensive spectral distribution of transmitted light in consideration of both characteristics when the anti-reflection film is applied to the dyed lens is shown by a broken line in FIG.

As shown in FIG. 2, the reflectance of the antireflection film is suppressed to approximately 1% or less in the entire visible range.
Among them, the reflectance of the blue component of 400 to 500 nm is relatively high. When the chromaticity of the reflected light is viewed as the object color of the film, the film color is “blue” when the lightness is 5. As for the transmittance of the dyed lens, as shown by the solid line in FIG. 3, the transmittance of the blue component of 400 to 500 nm is relatively high. When the chromaticity of the transmitted light is regarded as the object color of the dyed lens, the lens color is “light purple blue” when the lightness is 5. Further, as indicated by the solid line and the broken line in FIG. 3, the spectral distribution of the transmitted light substantially matches the spectral transmittance distribution of the dye lens. Therefore, according to the configuration of the first embodiment, both the color stimulus of the light transmitted through the optical member and the color stimulus of the reflected light can be aligned in the bluish color.

Table 2 shows the film constitution of the antireflection film of Example 2. The first layer is a layer in contact with the dyed lens, and the seventh layer is a layer in contact with air.

[0025]

[Table 2] Center wavelength λ = 550 nm Layer number Material name Optical thickness 1 SiO2 0.161 λ / 4 2 TiO2 0.227 λ / 4 3 SiO2 0.440 λ / 4 4 TiO2 0.640 λ / 4 5 SiO2 0.199 λ / 4 6 TiO2 0.694 λ / 4 7 SiO2 0.960 λ / 4

The optical characteristics of the antireflection film of Example 2 having the above-mentioned film structure are as follows: luminous reflectance is 3%, and chromaticity of reflected light is CI.
In E chromaticity coordinate, x = 0.4400, y = 0.3024, main wavelength is 625.7 nm, complementary color main wavelength is 492.6 nm,
Stimulus purity of chromaticity of reflected light with respect to the dominant wavelength is 31.09%
It is. The spectral reflectance distribution of the antireflection film of Example 2 is shown in FIG. 4, and the position of the reflected light in the CIE chromaticity coordinate is shown in FIG.

As for the optical characteristics of the dyed lens used in Example 2, the luminous reflectance was 49.2%, and the chromaticity of transmitted light was CIE chromaticity coordinates at x = 0.35666, y = 0.323.
0, the main wavelength is 601.9 nm, and the complementary color main wavelength is 489.1.
nm, the stimulus purity of the chromaticity of transmitted light with respect to the dominant wavelength is 14.
28%. The spectral transmittance distribution of the dyed lens itself of Example 2 is shown by the solid line in FIG. 5, and the position of the transmitted light in the CIE chromaticity coordinate is shown in FIG. Further, a comprehensive spectral distribution of transmitted light in consideration of both characteristics when the anti-reflection film is applied to the dyed lens is shown by a broken line in FIG.

As shown in FIG. 4, the reflectance of the antireflection film is suppressed to about 2% or less in the entire visible range.
Among them, the reflectance of the red component in the region near 700 nm is relatively high. When the chromaticity of the reflected light is viewed as the object color of the film, the film color is “purple red” when the lightness is 5. As for the transmittance of the dyed lens, the transmittance of the red component of 620 to 700 nm is relatively high as shown by the solid line in FIG. When the chromaticity of the transmitted light is viewed as the object color of the dyed lens, the color of the lens is “light purple red” when the lightness is 5. Further, as indicated by the solid line and the broken line in FIG. 5, the spectral distribution of the transmitted light substantially matches the spectral transmittance distribution of the dyed lens. Therefore, according to the configuration of the second embodiment, both the color stimulus of the light transmitted through the optical member and the color stimulus of the reflected light can be aligned in a reddish color.

The above description of the optical characteristics of the antireflection film is based on the assumption that the incident angle of the light flux with respect to the coating layer is 0 deg. However, when the spectacle lens or the like as in the embodiment is actually used, the light is incident on the film from all directions. It is desirable to suppress the change in the dominant wavelength of the reflected light with respect to the change in the angle to be small.

Generally, when the angle of incidence of light on an interference film such as an antireflection film increases, the spectral distribution of reflected light shifts to the short wavelength side. However, in comparison with the conventional antireflection film having the spectral reflectance distribution that mainly reflects the green component, the antireflection film having the spectral reflectance distribution that mainly reflects the blue component shown in Example 1 has a smaller incident angle. The change in chromaticity of reflected light with respect to the change is small.

When the green component is mainly reflected, the boundary wavelengths on both the long wavelength side and the short wavelength side must exist in the visible region in order to limit the range of the main reflection component. When the incident angle becomes large and the spectral distribution shifts to the short wavelength side, the bandwidth of the main reflection component hardly changes, and the boundary wavelength on the short wavelength side and the long wavelength side that limit this are both on the short wavelength side. Will be shifted to. Therefore,
The dominant wavelength moves to the short wavelength side.

On the other hand, in the case of the antireflection film having the spectral reflectance that mainly reflects the blue component as in Example 1, the range of the main reflection component is limited to the long wavelength side in the visible region. It is only the boundary wavelength, and even if the incident angle becomes large and the spectral distribution shifts to the short wavelength side, the boundary wavelength on the long wavelength side only shifts to the short wavelength side, and the bandwidth of the main reflection component becomes narrow. However, the change in the dominant wavelength is relatively small.

Therefore, according to the structure of the first embodiment, the change in the dominant wavelength of the reflected light with respect to the change in the incident angle is small as compared with the conventional antireflection film having the spectral reflectance distribution that mainly reflects the green component. . Table 3 shows the CIE chromaticity of the chromaticity of the reflected light with respect to the change of the incident angle between the conventional typical antireflection film having a relatively high reflectance of the green component and the antireflection films of Examples 1 and 2. The change of the coordinate point on the coordinate is shown.

[0034]

[Table 3] Angle Green component (conventional example) Blue component (example 1) Red component (example 2) (deg.) Xyxyxy 0 0.1844 0.3912 0.1790 0.1913 0.4400 0.3024 5 0.1834 0.3865 0.1787 0.1902 0.4443 0.3070 10 0.1813 0.3721 0.1778 0.1873 0.4561 0.3206 15 0.1798 0.3482 0.1770 0.1832 0.4723 0.3419 20 0.1818 0.3160 0.1779 0.1797 0.4869 0.3675 25 0.1905 0.2798 0.1837 0.1802 0.4926 0.3905 30 0.2078 0.2468 0.1994 0.1909 0.4845 0.4039 35 0.2325 0.2245 0.2294 0.2172 0.4637 0.4045 40 0.2603 0.2171 0.2681 0.2554 0.4366 0.3950

FIG. 7 is a graph showing the coordinate points shown in Table 3 in CIE chromaticity coordinates, and FIG. 8 is a partially enlarged graph thereof. In FIG. 8, the correspondence between the incident angle and the coordinate points is shown. It is shown. As shown in these graphs, in the conventional antireflection film, the change in purity of the reflected light is relatively small in the incident angle range of 0 to 40 deg., But the change in the dominant wavelength is about 50.
Since it is relatively wide from 0 nm to 430 nm, the change in appearance color is relatively large. This change corresponds to a change from "bright green with a bluish green" to "purple with a bright bluish purple" in the state of lightness 5, for example.

On the other hand, in the structure of the first embodiment, the change in the dominant wavelength of the reflected light is approximately 470 n in the incident angle range of 0 to 40 deg.
Since it falls within the range of about ± 5 nm centering on m, the change in appearance color stimulus is smaller than that in the conventional example, although there is a change in purity. This change is "blue" when the brightness is 5.
To "bright bluish purple".

When the color difference between the color at the incident angle of 0 deg. And the color at the incident angle of 40 deg. Is obtained by the CIE1964 color difference formula, the conventional example is the largest at 12.7199, and the first example is
6.8962, and in Example 2 it is 4.8577.

[0038]

As described above, according to the present invention, a base material such as a lens that looks blue or red is provided with a coating layer capable of obtaining reflected light of a similar color,
The color stimulus of the transmitted light seen by the wearer and the color stimulus of the lens seen by a person other than the wearer by the light reflected by the surface can be matched. Therefore, for example, when the present invention is applied to a spectacle lens, it is possible to provide a spectacle lens excellent in fashionability that does not impair the hue of a base material such as a spectacle lens dyed with a color given by reflected light. You can

When both the color stimulus of the light transmitted through the base material and the color stimulus of the light reflected by the coating layer are aligned in the blue color, the light stimulus of the light is compared with the case of using other colors. A change in the dominant wavelength of the reflected light of the coating layer due to a change in the incident angle can be suppressed to a small value, and an optical member having little angular dependence of the color stimulation of the reflected light can be provided.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an outline of a configuration of an optical member according to an embodiment of the present invention.

FIG. 2 is a graph showing a spectral reflectance distribution of the antireflection film of Example 1.

FIG. 3 is a graph showing a spectral transmittance distribution of the dyed lens of Example 1.

FIG. 4 is a graph showing a spectral reflectance distribution of the antireflection film of Example 2.

FIG. 5 is a graph showing a spectral transmittance distribution of a dyed lens of Example 2.

FIG. 6 is a graph showing the chromaticity of the reflected light of the antireflection film and the transmitted light of the dyed lens of Examples 1 and 2 on the CIE chromaticity coordinate.

FIG. 7 is a graph showing changes in chromaticity based on changes in incident angle of the antireflection films of Conventional Example, Example 1 and Example 2 in CIE chromaticity coordinates.

FIG. 8 is an enlarged graph showing a main part of FIG.

[Explanation of symbols]

 1 Dye lens (base material) 10 Glass plate (base material) 2, 20 Antireflection film (coating layer)

Claims (5)

[Claims] 1. An optical member comprising a base material mainly transmitting components in a specific wavelength range of visible wavelength range and a coating layer applied to the surface of the base material, wherein the base material is blue- Absorption rate for the blue component on the shorter wavelength side than the green boundary wavelength is longer than the green and red components on the long wavelength side, and the transmittance of the blue component has a relatively high spectral transmittance distribution, and the coating layer is , A wavelength-selective optic having a spectral reflectance distribution such that the reflectance for blue components on the short wavelength side of the blue-green boundary wavelength is higher than the reflectance for green and red components on the long wavelength side. Element. 2. An optical member comprising a base material that mainly transmits a component in a specific wavelength range of a visible wavelength range, and a coating layer formed on the surface of the base material, wherein the base material is red- Absorption rate for the red component on the longer wavelength side than the green boundary wavelength is shorter than the absorption rate for the green and blue components on the short wavelength side, and the transmittance of the red component has a relatively high spectral transmittance distribution, and the coating layer is , An optical having a wavelength selectivity, which has a spectral reflectance distribution such that the reflectance for a red component on the long wavelength side of the red-green boundary wavelength is higher than the reflectance for green and blue components on the short wavelength side. Element. 3. The main wavelength or complementary color main wavelength of the light flux transmitted through the base material and the main wavelength or complementary color main wavelength of the light flux reflected by the coating layer are in substantially the same range. An optical member having wavelength selectivity according to any one of 1 and 2. 4. The optical member having wavelength selectivity according to claim 3, wherein the difference between the dominant wavelength of the base material and the coating layer or the dominant wavelength of the complementary color is in the range of ± 10 nm. 5. The optical member having wavelength selectivity according to claim 1, wherein the base material is a lens having power, and the coating layer is an antireflection film.