Color image reading apparatus having dichroic mirror and blazed diffraction grating
AssigneeCanon Kabushiki Kaisha
InventorHiroshi Sato
Life of this patent
Estimating the term…
Abstract
A color image reading apparatus includes a light-receiving unit in which a plurality of line sensors are disposed at equal intervals on a same substrate, an imaging optical system for imaging an object on the light-receiving unit, a blazed diffraction grating, disposed in an optical path between the imaging optical system and the light-receiving unit, for color-separating light from the object into a plurality of color light beams, and a dichroic mirror disposed in an optical path between the blazed diffraction grating and the light-receiving unit, and having at least two reflecting surfaces.
Claims9
A color image reading apparatus comprising:
- light-receiving means in which a plurality of line sensors are disposed at equal intervals on a single substrate;
- an imaging optical system for imaging an object on said light-receiving means;
- a blazed diffraction grating, disposed in an optical path between said imaging optical system and said light-receiving means, for color-separating light from the object into at least three color light beams;
- and
- a dichroic mirror disposed in an optical path between said blazed diffraction grating and said light-receiving means, and having at least two reflecting surfaces,
- wherein said dichroic mirror corrects the intervals of said at least three color light beams on said light-receiving means by reflecting said at least three color light beams color-separated by said blazed diffraction grating.
Dependencies are inferred from the claim text.