Anti-reflection member and cathode ray tube
First Claim
Patent Images
1. An anti-reflection member including a light transmittable substrate and an anti-reflection film formed on said light transmittable substrate, said anti-reflection film comprising:
- a first film formed from a light transmittable material on a principal plane of said light transmittable substrate, said first film having a thickness set in a range of 70 nm or less;
a second film formed from a light absorptive material having an electrical conductivity on said first film, said second film having a thickness set in a range of 30 nm or less in accordance with a specific transmittance of said anti-reflection film;
a third film formed from a light transmittable material on said second film, said third film having an optical thickness in a range of about a ¼
-wavelength to a ⅛
-wavelength;
a fourth film formed from a light absorptive material having an electrical conductivity on said third film, said fourth film having a thickness set in a range of 30 nm or less in accordance with said specific transmittance of said anti-reflection film;
a fifth film formed from a light transmittable material having a high refractive index on said fourth film; and
a sixth film formed from a light transmittable material on said fifth film, said sixth film having a refractive index smaller than that of each of said third film and said fifth film and also having an optical thickness which is about a ¼
-wavelength when a wavelength of incident light is about 550 nm.
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Abstract
The present invention relates to an anti-reflection member and a display. The anti-reflection member includes a light transmittable substrate and an anti-reflection film. The anti-reflection film includes a first film formed from a light transmittable material, a second film formed from a light absorptive material having an electrical conductivity, a third film formed from a light transmittable material, a fourth film formed from a light transmittable material having an electrical conductivity, a fifth film formed from a light transmittable material having a high refractive index, and a sixth film formed from a light transmittable material. The anti-reflection member can prevent reflection of not only light coming from the first film side but also light coming from the sixth film side, thereby preventing an image from being doubly displayed on a screen.
34 Citations
12 Claims
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1. An anti-reflection member including a light transmittable substrate and an anti-reflection film formed on said light transmittable substrate, said anti-reflection film comprising:
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a first film formed from a light transmittable material on a principal plane of said light transmittable substrate, said first film having a thickness set in a range of 70 nm or less;
a second film formed from a light absorptive material having an electrical conductivity on said first film, said second film having a thickness set in a range of 30 nm or less in accordance with a specific transmittance of said anti-reflection film;
a third film formed from a light transmittable material on said second film, said third film having an optical thickness in a range of about a ¼
-wavelength to a ⅛
-wavelength;
a fourth film formed from a light absorptive material having an electrical conductivity on said third film, said fourth film having a thickness set in a range of 30 nm or less in accordance with said specific transmittance of said anti-reflection film;
a fifth film formed from a light transmittable material having a high refractive index on said fourth film; and
a sixth film formed from a light transmittable material on said fifth film, said sixth film having a refractive index smaller than that of each of said third film and said fifth film and also having an optical thickness which is about a ¼
-wavelength when a wavelength of incident light is about 550 nm.- View Dependent Claims (2, 3, 4, 5, 6)
an electrical conductivity is given to said anti-reflection film by said second film and said fourth film. -
3. An anti-reflection member according to claim 1, wherein a sheet resistance of said anti-reflection film is in a range of 1 KΩ
- /□
or less.
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4. An anti-reflection member according to claim 1, wherein a transmittance of said anti-reflection film is made variable in a specific range by adjusting the thicknesses of said second film and said fourth film in correlation with each other.
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5. An anti-reflection member according to claim 1, wherein said fourth film is a red-colored light transmittable film having a transmittance distribution in which a transmittance of light in a wavelength range of 550 nm or more becomes high.
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6. An anti-reflection member according to claim 1, wherein said fourth film is formed from NiVOx.
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7. A cathode ray tube having a panel portion provided with an anti-reflection member including a light transmittable substrate and an anti-reflection film formed on said light transmittable substrate, said anti-reflection film comprising:
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a first film formed from a light transmittable material on a principal plane of said light transmittable substrate, said first film having a thickness set in a range of 70 nm or less;
a second film formed from a light absorptive material having an electrical conductivity on said first film, said second film having a thickness set in a range of 30 nm or less in accordance with a specific transmittance of said anti-reflection film;
a third film formed from a light transmittable material on said second film, said third film having an optical thickness in a range of about a ¼
-wavelength to a ⅛
-wavelength;
a fourth film formed from a light absorptive material having an electrical conductivity on said third film, said fourth film having a thickness set in a range of 30 nm or less in accordance with said specific transmittance of said anti-reflection film;
a fifth film formed from a light transmittable material having a high refractive index on said fourth film; and
a sixth film formed from a light transmittable material on said fifth film, said sixth film having a refractive index smaller than that of each of said third film and said fifth film and also having an optical thickness which is about a ¼
-wavelength when a wavelength of incident light is about 550 nm.- View Dependent Claims (8, 9, 10, 11, 12)
an electrical conductivity is given to said anti-reflection film by said second film and said fourth film. -
9. A cathode ray tube according to claim 7, wherein a sheet resistance of said anti-reflection film is in a range of 1 KΩ
- /□
or less.
- /□
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10. A cathode ray tube according to claim 7, wherein a transmittance of said anti-reflection film is made variable in a specific range by adjusting the thicknesses of said second film and said fourth film in correlation with each other.
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11. A cathode ray tube according to claim 7, wherein said fourth film is a red-colored light transmittable film having a transmittance distribution in which a transmittance of light in a wavelength range of 550 nm or more becomes high.
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12. A cathode ray tube according to claim 7, wherein said fourth film is formed from NiVOx.
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Specification
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Current AssigneeSony Corporation (Sony Group Corp.)
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Original AssigneeSony Corporation (Sony Group Corp.)
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InventorsAraki, Soya, Sumida, Takao
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Primary Examiner(s)Patel, Vip
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Application NumberUS09/981,909Publication NumberTime in Patent Office711 DaysField of Search313/478, 313/479, 313/112, 313/313US Class Current313/479CPC Class CodesG02B 1/116 including electrically cond...H01J 2229/8918 by using interference effectsH01J 29/896 Anti-reflection means, e.g....
