Optical device and antireflection film
AssigneeHoya Corporation
InventorsMakoto Adachi, Tsuneo Muraki, Kazuo Kawamata
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Abstract
An antireflection film is formed by alternately laminating a low refractive index layer and a high refractive index layer. The antireflection film has a reflectance of 10% or less and an excitation purity range of 10% or less for visible light in a wavelength range from 380 nm to 780 nm incident at an incident angle ranging from 0° to 45° when regarding the direction perpendicular to the surface as 0°. The antireflection film inhibits a specific color tone from occurring in interference color of incident light coming from an oblique direction.
Claims7
An optical element comprising:
- an optically transparent substrate;
- and
- an antireflection film formed on at least one surface of the substrate,
- wherein the antireflection film is formed by alternately laminating a low refractive index layer and a high refractive index layer, and
- wherein the antireflection film has a reflectance of 10% or less and an excitation purity range of 10% or less for visible light in a wavelength range from 380 nm to 780 nm incident at an incident angle ranging from 0° to 45° when regarding the direction perpendicular to the surface of the substrate as 0°.
An antireflection film comprising:
- a low refractive index layer;
- and
- a high refractive index layer,
- wherein the antireflection film is formed by alternately laminating the low refractive index layer and the high refractive index layer, and
- wherein the antireflection film has a reflectance of 10% or less and an excitation purity range of 10% or less for visible light in a wavelength range from 380 nm to 780 nm incident at an incident angle ranging from 0° to 45° when regarding the direction perpendicular to the surface of the substrate as 0°.
Dependencies are inferred from the claim text.