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:
Aug. 08, 2006
Filed:
Mar. 13, 2002
Masato Koshimizu, Kanagawa, JP;
Tsutomu Takayama, Kanagawa, JP;
Mitsugu Hanabusa, Tokyo, JP;
Kengo Kinumura, Kanagawa, JP;
Masato Koshimizu, Kanagawa, JP;
Tsutomu Takayama, Kanagawa, JP;
Mitsugu Hanabusa, Tokyo, JP;
Kengo Kinumura, Kanagawa, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
This invention has an object of reading a high-quality image by detecting and correcting dust or scratches present on a transparent original in an image reading apparatus for reading, e.g., a transparent original. To achieve this object, an original illumination unit in the image reading apparatus for reading an original includes at least a first light source for emitting light in a visible region, a second light source for emitting light in a n invisible region, and a light guide plate which has these light sources arranged at end faces and has first and second light guide patterns for guiding light beams from the first and second light sources to the entire light-emitting surface.