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:
Apr. 24, 2012
Filed:
Jun. 17, 2011
Jun Tanaka, Chichibu, JP;
Takashi Machida, Niiza, JP;
Shinobu Kato, Yokohama, JP;
Keiji Tsutaoka, Tokyo, JP;
Taketo Ochiai, Tokyo, JP;
Tetsurou Ishikawa, Tokyo, JP;
Jun Tanaka, Chichibu, JP;
Takashi Machida, Niiza, JP;
Shinobu Kato, Yokohama, JP;
Keiji Tsutaoka, Tokyo, JP;
Taketo Ochiai, Tokyo, JP;
Tetsurou Ishikawa, Tokyo, JP;
Canon Denshi Kabushiki Kaisha, Saitama-Ken, JP;
Abstract
An image reading apparatus which is capable of performing accurate shading correction with simple arrangement while preventing a reference member from being scratched and preventing paper powder and the like dust from being deposited on the reference member. The image reading apparatus includes an image reading unit in which a contact glass guides an original on an image reading location. The contact glass is held by a glass holding member. A line image sensor reads the image on the original conveyed on the image reading location, through the contact glass. The image reading unit further includes a reference member whose image is readable by the image sensor, and a moving mechanism to move the image sensor so as to enable the image sensor to alternatively read the original and a reference surface of the reference member.