Optical element having minute periodic structure
AssigneeCanon Kabushiki Kaisha
InventorTakeshi Nishimura
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Abstract
An optical element is disclosed which has a reflection suppressing function and a color balance correcting function in a minute periodic structure. The optical element has a base member and a minute periodic structure which is provided on a surface of the base member and has a period smaller than a wavelength of incident light on the optical element. The minute periodic structure has a characteristic that the reflectance of light a first wavelength on a short wavelength side in a wavelength range of the incident light is lower than the reflectance of light at a second wavelength on a long wavelength side in the wavelength range of the incident light.
Claims12
An optical element comprising:
- a base member;
- and
- a periodic structure which is provided on a surface of the base member and has a period smaller than a wavelength of incident light on the optical element,
- wherein the base member is formed of resin, and the periodic structure is integrally formed with the base member through molding, and
- wherein the periodic structure has a characteristic that a reflectance of light for each wavelength in a range of 400 nm to 500 nm of the incident light is lower than a reflectance of light for each wavelength in a range of 570 nm to 700 nm of the incident light.
An optical element comprising:
- a base member;
- and
- a periodic structure which is provided on a surface of the base member and has a period smaller than a wavelength of incident light on the optical element,
- wherein the periodic structure has a characteristic that a reflectance of light for each wavelength in a range of 400 nm to 500 nm of the incident light is lower than a reflectance of light for each wavelength in a range of 570 nm to 700 nm of the incident light, and
- wherein the base member is a lens member, and the periodic structure is provided on each of lens surfaces on both sides of the lens member.
Dependencies are inferred from the claim text.