Imaging apparatus having a curved image surface
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.
Claims4
1-33. (canceled)
An imaging apparatus comprising:
- an imaging optical system;
- and
- an image surface 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) an aperture stop, (b) a first optical system disposed on an object side of the aperture stop, and (c) a second optical system disposed on an image side of the aperture stop,
- wherein the first optical system and the second optical system have different positive power, and
- wherein the following conditional expressions are satisfied:
- 0.8≦fsys/dpup≦1.5
- 0.8≦|Rimg|/fsys≦1.5
- where fsys represents a focal length of the imaging optical system, dpup represents a distance from an exit pupil of the imaging optical system to the image surface, and Rimg represents a radius of curvature of the image surface.
Dependencies are inferred from the claim text.