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:
Nov. 08, 1994
Filed:
May. 24, 1993
Takehiko Nakai, Tokyo, JP;
Michitaka Setani, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An image reading apparatus is provided with a light-receiving device, an imaging optical system and a blazed diffraction grating. In the light-receiving device, a plurality of line sensors are arranged on the same substrate. An image of an object to be imaged is formed on the light-receiving device by the imaging optical system. The blazed diffraction grating is arranged in an optical path between the imaging optical system and the light-receiving device. The blazed diffraction grating color-separates a light beam from the object to be imaged into a plurality of light components. The diffraction grating is so constructed to have grating lines with at least two different grating heights.