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:
Jul. 30, 2013
Filed:
Sep. 02, 2009
Hiroyuki Horii, Kawasaki, JP;
Hiroyuki Horii, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A detection apparatus determines whether an output of the light-receiving unit meets a predetermined reference level when the light emission amount of the light-emitting unit is changed, under a condition that the output of the light-receiving unit changes according to a change in a light emission amount of the light-emitting unit. The detection apparatus detects, based on the output from the light-receiving unit, that the light emitted from the light-emitting unit to the light-receiving unit is blocked, under a condition that the light-emitting unit is emitting light based on a light emission amount emitted from the light-emitting unit when it has been determined that the output of the light-receiving unit meets the predetermined reference level.