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US 2026/0235787 A1Published application
Optical system and image pickup apparatus
AssigneeCanon Kabushiki Kaisha
InventorYuuki MAEDA
Life of this patent
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Abstract
An optical system includes a lens A, and an optical filter made from resin. A predetermined inequality is satisfied.
Claims20
An optical system comprising:
- a lens A;
- and
- an optical filter made from resin,
- wherein the following inequality is satisfied:
- n
-
- A
- =
- (
- n
-
- 2
- +
- n
-
- 3
- )
- /
- 2
- 0.
- ≤
- ≤
- |
- n
-
- 1
- -
- nA
- |
- ≤
- 0
- .
- 0
-
- 2
-
- 0
- where n1 is a refractive index of the optical filter for d-line in a first direction parallel to an optical axis of the lens A, n2 is a refractive index of the optical filter for the d-line in a second direction orthogonal to the first direction, n3 is a refractive index of the optical filter for the d-line in a third direction orthogonal to both the first direction and the second directions.
35 more elements
An image pickup apparatus comprising:
- an optical system;
- and
- an image sensor,
- wherein the optical system includes:
- a lens A, and
- an optical filter made from resin, and
- wherein the following inequality is satisfied:
- n
-
- A
- =
- (
- n
-
- 2
- +
- n
-
- 3
- )
- /
- 2
- 0.
- ≤
- |
- n
-
- 1
- -
- nA
- |
- ≤
- 0
- .
- 0
-
- 2
-
- 0
- where n1 is a refractive index of the optical filter for d-line in a first direction parallel to an optical axis of the lens A, n2 is a refractive index of the optical filter for the d-line in a second direction orthogonal to the first direction, n3 is a refractive index of the optical filter for the d-line in a third direction orthogonal to both the first direction and the second directions.
37 more elements
Dependencies are inferred from the claim text.