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US 11,609,410 B2Granted
Optical system, optical apparatus, and image pickup apparatus
AssigneeCanon Kabushiki Kaisha
InventorKana Kobayashi
Life of this patent
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Abstract
An optical system includes a first focusing unit and a second focusing unit that move in different loci during focusing. In a first arrangement state, the first focusing unit and the second focusing unit are so arranged to generate a first aberration while maintaining an in-focus state at a predetermined object distance, and in a second arrangement state, the first focusing unit and the second focusing unit are so arranged to generate a second aberration different from the first aberration while maintaining the in-focus state at the predetermined object distance.
Claims15
An optical system comprising:
- a first lens unit disposed closest to an object side;
- a first focusing unit disposed on an image side of the first lens unit;
- and
- a second focusing unit disposed on the image side of the first focusing unit,
- wherein the first focusing unit and the second focusing unit move in different loci during focusing,
- wherein in a first arrangement state, the first focusing unit and the second focusing unit are so arranged to generate a first aberration while maintaining an in-focus state at a predetermined object distance, and in a second arrangement state, the first focusing unit and the second focusing unit are so arranged to generate a second aberration different from the first aberration while maintaining the in-focus state at the predetermined object distance,
- wherein the first arrangement state is changed to the second arrangement state by moving the first focusing unit and the second focusing unit only, and focusing is performed by moving the first focusing unit and the second focusing unit only,
- wherein a total length of the optical system, which is a distance between a most object side surface of the first lens unit and an image plane, is the same in the first arrangement state and the second arrangement state, and
- wherein, when changing between the first arrangement state and the second arrangement state, the first lens unit does not move.
6 more elements
An optical apparatus comprising:
- an optical system, wherein the optical system includes:
- a first lens unit disposed closest to an object side,
- a first focusing unit disposed on an image side of the first lens unit, and
- a second focusing unit disposed on the image side of the first focusing unit,
- wherein the first focusing unit and the second focusing unit move in different loci during focusing in a focusing operation,
- wherein, in a first arrangement state, the first focusing unit and the second focusing unit are arranged to generate a first aberration while maintaining an in-focus state at a predetermined object distance, and in a second arrangement state, the first focusing unit and the second focusing unit are arranged to generate a second aberration different from the first aberration while maintaining the in-focus state at the predetermined object distance, and
- wherein the first arrangement state is changed to the second arrangement state by moving the first focusing unit and the second focusing unit only, and focusing is performed by moving the first focusing unit and the second focusing unit only,
- wherein a total length of the optical system, which is a distance between a most object side surface of the first lens unit and an image plane, is the same in the first arrangement state and the second arrangement state, and
- wherein, when changing between the first arrangement state and the second arrangement state, the first lens unit does not move.
6 more elements
An image pickup apparatus comprising:
- an optical system;
- and
- an image pickup device configured to receive an image formed by the optical system,
- wherein the optical system includes:
- a first lens unit disposed closest to an object side,
- a first focusing unit disposed on an image side of the first lens unit, and
- a second focusing unit disposed on the image side of the first focusing unit,
- wherein the first focusing unit and the second focusing unit move in different loci during focusing in a focusing operation,
- wherein, in a first arrangement state, the first focusing unit and the second focusing unit are arranged to generate a first aberration while maintaining an in-focus state at a predetermined object distance, and in a second arrangement state, the first focusing unit and the second focusing unit are arranged to generate a second aberration different from the first aberration while maintaining the in-focus state at the predetermined object distance, and
- wherein the first arrangement state is changed to the second arrangement state by moving the first focusing unit and the second focusing unit only, and focusing is performed by moving the first focusing unit and the second focusing unit only,
- wherein a total length of the optical system, which is a distance between a most object side surface of the first lens unit and an image plane, is the same in the first arrangement state and the second arrangement state, and
- wherein, when changing between the first arrangement state and the second arrangement state, the first lens unit does not move.
9 more elements
Dependencies are inferred from the claim text.