The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 22, 1993
Filed:
Jun. 04, 1992
Applicant:
Inventor:
Michitaka Setani, Kawasaki, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
2502081 ; 359571 ;
Abstract
A color reading apparatus includes a reflection type one dimensional blazed diffraction grating for color separation which is provided on an optical path between an imaging optical system for focusing a color image on a photosensor, and the photosensor in which three line sensors are disposed on a common substrate. The pitch of the diffraction grating varies in a direction of the pitch so as to control the reflective diffraction angle from reflection points resulting from different incident angles on the diffraction grating and to prevent the occurrence of a blur of .+-.1st-order diffracted light in the pitch cross section on the diffraction grating.