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US 8,559,112 B2Granted
Optical element
AssigneeCanon Kabushiki Kaisha
InventorTakeharu Okuno
Life of this patent
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Abstract
An optical element includes an optical surface formed by a press molding method, wherein a ray effective portion of the optical surface has formed thereon an antireflection structure including a minute uneven structure, which contains a component different from that of a base of the optical element and has an average pitch of 400 nm or less.
Claims12
A method comprising:
- forming an aspherical optical surface of an optical element by a press molding method, wherein the optical element is made of a glass containing at least one of an alkali metal and an alkali earth metal;
- forming a film on the aspherical optical surface by a sol-gel process, wherein the film is made of a material containing at least one of an aluminum or an aluminum oxide;
- and
- forming an antireflection structure including a minute uneven structure on the aspherical optical surface by immerging the film into warm water having temperature of between 40° C. and 100° C.,
- wherein the minute uneven structure has an average pitch of 400 nm or less, and
- wherein the optical element is made of a glass having a refractive index of 1.583, a refractive index dispersion of 59.4 and transition point of 506° C.
3 more elements
A method comprising:
- forming an aspherical optical surface of an optical element by a press molding method, wherein the optical element is made of a glass containing at least one of an alkali metal and an alkali earth metal;
- forming a film on the aspherical optical surface by a sol-gel process, wherein the film is made of a material containing at least one of an aluminum or an aluminum oxide;
- and
- forming an antireflection structure including a minute uneven structure on the aspherical optical surface by immerging the film into warm water having temperature of between 40° C. and 100° C.,
- wherein the minute uneven structure has an average pitch of 400 nm or less, and
- wherein the optical element is made of a glass having a refractive index of 1.854, a refractive index dispersion of 40.4 and transition point of 614° C.
3 more elements
A method of manufacturing an optical apparatus comprising:
- forming an aspherical optical surface of an optical element by a press molding method, wherein the optical element is made of a glass containing at least one of an alkali metal and an alkali earth metal;
- forming a film on the aspherical optical surface by a sol-gel process, wherein the film is made of a material containing at least one of an aluminum or an aluminum oxide;
- and
- forming an antireflection structure including a minute uneven structure on the aspherical optical surface by immerging the film into warm water having temperature of between 40° C. and 100° C.,
- wherein the minute uneven structure has an average pitch of 400 nm or less, and
- wherein the optical element is made of a glass having a refractive index of 1.583, a refractive index dispersion of 59.4 and transition point of 506° C.
3 more elements
A method of manufacturing an optical apparatus comprising:
- forming an aspherical optical surface of an optical element by a press molding method, wherein the optical element is made of a glass containing at least one of an alkali metal and an alkali earth metal;
- forming a film on the aspherical optical surface by a sol-gel process, wherein the film is made of a material containing at least one of an aluminum or an aluminum oxide;
- and
- forming an antireflection structure including a minute uneven structure on the aspherical optical surface by immerging the film into warm water having temperature of between 40° C. and 100° C.,
- wherein the minute uneven structure has an average pitch of 400 nm or less, and
- wherein the optical element is made of a glass having a refractive index of 1.854, a refractive index dispersion of 40.4 and transition point of 614° C.
3 more elements
Dependencies are inferred from the claim text.