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US 7,626,772 B2Granted
Optical system and optical apparatus having the same
AssigneeCanon Kabushiki Kaisha
InventorTakehiko Nakai
Life of this patent
Estimating the term…
Abstract
An optical system includes a first lens with a functional film having film hardness of equal to or less than H formed on at least on one surface thereof, and a second lens located opposite the surface with the functional film of the first lens and having a diameter larger than that of the surface with the functional film, wherein the first lens and the second lens are in marginal contact with each other.
Claims20
An optical system comprising:
- a first lens with a functional film having film hardness of equal to or less than H formed on at least one surface thereof;
- and
- a second lens located opposite the surface with the functional film of the first lens and having a diameter larger than that of the surface with the functional film,
- wherein the first lens and the second lens are in marginal contact with each other.
1 more element
An optical system comprising:
- a first lens with a functional film formed on at least one surface thereof;
- and
- a second lens located opposite the surface with the functional film of the first lens and having a diameter larger than that of the surface with the functional film,
- wherein the first lens and the second lens are in marginal contact with each other, and
- wherein film hardness of the functional film is less than hardness of a material of the second lens or film hardness of a film formed on a surface of the second lens opposite the surface with the functional film.
2 more elements
An optical apparatus comprising:
- an optical system including,
- a first lens with a functional film having film hardness of equal to or less than H formed on at least one surface thereof;
- and
- a second lens located opposite the surface with the functional film of the first lens and having a diameter larger than that of the surface with the functional film,
- wherein the first lens and the second lens are in marginal contact with each other.
2 more elements
Dependencies are inferred from the claim text.