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. 22, 2008
Filed:
Dec. 02, 2004
Takeshi Sekiya, Abiko, JP;
Chikara Sato, Hachioji, JP;
Takeshi Sekiya, Abiko, JP;
Chikara Sato, Hachioji, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A sheet detecting apparatus provided with a light emitter and a light receiver for receiving light emitted from the light emitter through a sheet conveying path, wherein the light receiver detects any change in a quantity of light from the light emitter caused by a sheet passing on the conveying path intercepting the light emitted from the light emitter, to thereby detect the presence or absence of the sheet is provided with a V/I converting circuit for driving the light emitter, a comparing circuit for effecting negative feedback on the V/I converting circuit by an output signal, and changing the quantity of light of the light emitter, and a limiter circuit for applying a limitation to the negative feedback effected on the V/I converting circuit by the comparing circuit.