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:
Dec. 19, 1989
Filed:
Jul. 22, 1988
Hiroshi Nakazato, Ohme, JP;
Takashi Matsumura, Yokohama, JP;
Takahiro Akamatsu, Machida, JP;
Kenji Fukui, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A device for detecting a position of an edge of a disk-like workpiece having an outer periphery whose shape includes a portion bearing positional information related to the workpiece, the device including a system for rotationally moving the workpiece; an illuminating system; and a photodetecting system; wherein the illuminating system and the photodetecting system are disposed so as to sandwich therebetween an outer peripheral portion of the workpiece when it is rotationally moved by the moving system and wherein the illuminating system projects, toward the photodetecting system, a light beam having an elongated shape in cross-section.