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:
Nov. 20, 1984
Filed:
Apr. 21, 1982
Shunzo Inoue, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A device in which a light source and a light receiving element are disposed at one side of a sheet transportation path and a reflecting member is disposed at the other side of the sheet transportation path so that a light ray emitted from the light source is reflected by the reflecting surface of the reflecting member and is caused to enter the light receiving element and any variation in the quantity of light entering the light receiving element is detected to thereby detect the presence of a sheet. The reflecting member is disposed such that the angle formed by the normal to the reflecting member with the surface of the sheet placed at the detection position is equal to or smaller than the critical angle at which total reflection is created on the surface of the sheet.