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:
Mar. 09, 2004
Filed:
Jul. 25, 2002
Ikuo Takeuchi, Ibaraki, JP;
Kunio Tsuruno, Tokyo, JP;
Tetsuya Morita, Kanagawa, JP;
Keizo Isemura, Tokyo, JP;
Ichiro Sasaki, Ibaraki, JP;
Masahiro Kurahashi, Tokyo, JP;
Atsushi Nakagawa, Ibaraki, JP;
Kenji Fukushi, Ibaraki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
The quantity of light of an optical sensor including a light emission portion and a light reception portion is adjusted through calculation before sheet detection is performed. In order to perform the light quantity adjustment, a voltage to be applied to the light emission portion of the optical sensor is obtained by performing calculation based on a relation between a voltage applied to the light emission portion before the adjustment and an output from the light reception portion before the adjustment. Then, it is judged whether the obtained voltage exists within a predetermined range and, if a positive result is obtained, the light quantity adjustment is ended. Further, a signal requesting the cleaning of the optical sensor is outputted in accordance with a value of the obtained voltage.