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:
Feb. 16, 1988
Filed:
Feb. 19, 1985
Yoji Shimojima, Furukawa, JP;
Alps Electric Co., Ltd., , JP;
Abstract
An optical rotary encoder comprises reflecting portions and nonreflecting portions provided alternately on a peripheral surface of a measured body freely rotatable, a light emitting diode for projecting light onto the measured body, a number of light receiving elements each delivering an output pulse signal upon reception of the light reflected from the reflecting portions of the measured body, and a counter for counting the number of pulses of the output signal obtained from the light receiving element for providing an output corresponding to a rotating angle of the measured body. A monitoring light receiving element is further provided near the light emitting diode, and the light output of the light emitting diode is controlled based on the output signal obtained from the monitoring light receiving element.