Image forming optical system and image reading apparatus including the same
AssigneeCanon Kabushiki Kaisha
InventorHiroto Kano
Life of this patent
Estimating the term…
Abstract
An image forming optical system includes a first image forming unit configured to form an image of a first surface onto a second surface, a second image forming unit including at least a portion of the first image forming unit and configured to form an image of the second surface onto a third surface, and a deflection unit configured to deflect light from the second surface toward the third surface. The numerical aperture of the first image forming unit on the side toward the second surface is larger than the numerical aperture of the second image forming unit on the side toward the second surface.
Claims19
An image forming optical system, comprising:
- a first image forming unit configured to form an enlarged image of a first surface onto a second surface;
- a second image forming unit including at least a portion of the first image forming unit and configured to form an image of the second surface onto a third surface;
- and
- a deflection unit disposed in an optical path between the second surface and the third surface and configured to deflect light,
- wherein a numerical aperture of the first image forming unit on a side toward the second surface is larger than a numerical aperture of the second image forming unit on a side toward the second surface.
An image reading apparatus, comprising:
- a first image forming unit configured to form an enlarged image of a first surface onto a second surface;
- a second image forming unit including at least a portion of the first image forming unit and configured to form an image of the second surface onto a third surface;
- a deflection unit disposed in an optical path between the second surface and the third surface and configured to deflect light;
- a display element configured to display an image on the first surface;
- and
- an image pickup element disposed on the third surface,
- wherein a numerical aperture of the first image forming unit on a side toward the second surface is larger than a numerical aperture of the second image forming unit on a side toward the second surface.
An image forming optical system, comprising:
- a first image forming unit configured to form an image of a first surface onto a second surface;
- a second image forming unit including at least a portion of the first image forming unit and configured to form an image of the second surface onto a third surface;
- and
- a deflection unit disposed in an optical path between the second surface and the third surface and configured to deflect light,
- wherein a numerical aperture of the first image forming unit on a side toward the second surface is larger than a numerical aperture of the second image forming unit on a side toward the second surface, and
- wherein the second image forming unit includes an intermediate image forming unit constituted by at least a portion of the first image forming unit and configured to form an intermediate image of the second surface and an image re-forming unit configured to re-form an image of the intermediate image onto the third surface.
Dependencies are inferred from the claim text.