Imaging apparatus
AssigneeCanon Kabushiki Kaisha
InventorKeiichiro Ishihara
Life of this patent
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Abstract
Provided is an imaging apparatus, including: an imaging optical system including a plurality of lenses; and an image plane which is disposed on an image side of the imaging optical system and is curved so that a concave surface thereof faces an object side of the imaging optical system. The imaging optical system includes an aperture stop. In the imaging optical system, a lens closer to the object side than the aperture stop and a lens closer to the image side than the aperture stop have different positive powers. A focal length of the imaging optical system is substantially equal to a distance from an exit pupil of the imaging optical system to the image plane. A radius of curvature of the image plane is substantially equal to the focal length of the imaging optical system.
Claims33
An imaging apparatus, comprising:
- an imaging optical system including a plurality of lenses;
- and
- an image plane which is disposed on an image side of the imaging optical system and is curved so that a concave surface thereof faces an object side of the imaging optical system, wherein:
- the imaging optical system includes an aperture stop;
- a lens disposed in the object side of the aperture stop in the imaging optical system and a lens disposed in the image side of the aperture stop in the imaging optical system have different positive powers;
- a focal length of the imaging optical system is substantially equal to a distance from an exit pupil of the imaging optical system to the image plane;
- and
- a radius of curvature of the image plane is substantially equal to the focal length of the imaging optical system.
An imaging apparatus, comprising:
- an imaging optical system including a plurality of lenses;
- and
- an image plane which is disposed on an image side of the imaging optical system and is curved so that a concave surface thereof faces an object side of the imaging optical system, wherein:
- the imaging optical system includes an aperture stop and a wave front control element disposed close to the aperture stop;
- a focal length of the imaging optical system is substantially equal to a distance from an exit pupil of the imaging optical system to the image plane;
- and
- a radius of curvature of the image plane is substantially equal to the focal length of the imaging optical system.
An imaging apparatus, comprising:
- an imaging optical system including a plurality of lenses;
- and
- an image plane which is disposed on an image side of the imaging optical system and is curved so that a concave surface thereof faces an object side of the imaging optical system, wherein:
- the imaging optical system includes a first lens and a second lens adjacent to each other, and an aperture stop disposed between the first lens and the second lens;
- of the first lens and the second lens, a surface on the aperture stop side of the first lens disposed in the object side of the aperture stop is a concave surface;
- of the first lens and the second lens, a surface on the aperture stop side of the second lens disposed in the image side of the aperture stop is a convex surface;
- a focal length of the imaging optical system is substantially equal to a distance from an exit pupil of the imaging optical system to the image plane;
- and
- a radius of curvature of the image plane is substantially equal to the focal length of the imaging optical system.
An imaging apparatus, comprising:
- an imaging optical system including a plurality of lenses;
- and
- an image plane which is disposed on an image side of the imaging optical system and is curved so that a concave surface thereof faces an object side of the imaging optical system, wherein:
- the imaging optical system includes an aperture stop;
- at least one of a lens surface closest to the object side and a lens surface closest to the image side in the imaging optical system is an aspherical surface;
- a focal length of the imaging optical system is substantially equal to a distance from an exit pupil of the imaging optical system to the image plane;
- and
- a radius of curvature of the image plane is substantially equal to the focal length of the imaging optical system.
Dependencies are inferred from the claim text.