Transparent diffuser for diffusing multiple wavelengths of light and method of manufacturing transparent diffuser
AssigneePanasonic Corporation
InventorYosuke Mizuyama
Life of this patent
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Abstract
A light diffuser panel for coupling to an optical element, includes a substrate with a first surface that is diffusive to a plurality of wavelengths of light and a second surface, wherein the substrate comprises a material with a refractive index nin that is greater than a refractive index nd of a medium outside of the first surface, λmin is a minimum wavelength of the plurality of wavelengths of light, λmax is a maximum wavelength of the plurality of wavelengths of light, the first surface is a diffractive grating surface with a grating period P, the grating period P is greater than λmax/(nd+nin), and P is smaller than λmin.
Claims13
A light diffuser panel for coupling to an optical element, comprising:
- a substrate with a first surface that is diffusive to a plurality of wavelengths of light and a second surface;
- wherein the substrate comprises a material with a refractive index nin that is greater than a refractive index nd of a medium outside of the first surface,
- λmin is a minimum wavelength of the plurality of wavelengths of light,
- λmax is a maximum wavelength of the plurality of wavelengths of light,
- the first surface is a diffractive grating surface with a grating period P for diffusing angled light without diffusing at least one of normal incident light and light incident at an angle approximate to the normal incident light,
- the grating period P is greater than λmax/(nd+nin), and
- P is smaller than λmin.
A manufacturing process for manufacturing a light diffuser panel that is configured to diffuse a plurality of wavelengths of light, wherein λmin is a minimum wavelength of the plurality of wavelengths of light and λmax is a maximum wavelength of the plurality of wavelengths of light, the method comprising:
- determining a material for a substrate with a refractive index nin that is greater than a refractive index nd of a medium within which the substrate is positioned;
- selecting a grating period P, wherein the grating period P is greater than λmax/(nd+nin), and P is smaller than λmin;
- and
- forming the substrate with a first surface that is diffusive to the plurality of wavelengths of light and a second surface, wherein the first surface is a diffractive grating surface with a grating period P for diffusing angled light without diffusing at least one of normal incident light and light incident at an angle approximate to the normal incident light.
A light diffuser panel for coupling to an optical element, comprising:
- a substrate with a first surface that is diffusive to a plurality of wavelengths of light and a second surface;
- wherein the substrate comprises a material with a refractive index nin that is greater than a refractive index nd of a medium outside of the first surface,
- λmin is a minimum wavelength of the plurality of wavelengths of light,
- λmax is a maximum wavelength of the plurality of wavelengths of light,
- the first surface is a diffractive grating surface with a grating period P which has one reflection order of diffraction and provides illumination on one side of the diffuser panel,
- the grating period P is greater than λmax/(nd+nin), and
- P is smaller than λmin.
A manufacturing process for manufacturing a light diffuser panel that is configured to diffuse a plurality of wavelengths of light, wherein λmin is a minimum wavelength of the plurality of wavelengths of light and λmax is a maximum wavelength of the plurality of wavelengths of light, the method comprising:
- determining a material for a substrate with a refractive index nin that is greater than a refractive index nd of a medium within which the substrate is positioned;
- selecting the grating period P, wherein the grating period is greater than λmax/(nd+nin), and P is smaller than λmin;
- and
- forming the substrate with a first surface that is diffusive to a plurality of wavelengths of light and a second surface, wherein the first surface is a diffractive grating surface with a grating period P which has one reflection order of diffraction and provides illumination on one side of the diffuser panel.
Dependencies are inferred from the claim text.