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:
Jun. 10, 1980
Filed:
Feb. 14, 1978
Motoi Iyeta, Hamamatsu, JP;
Abstract
As a substitute for the conventionally used pair of polarizer panels, a sensor disc is used in relatively rotatable combination with a pair of photo-sensitive elements arranged spatially on one side of the sensor disc and a light source system arranged spacially on the other side of the sensor disc. The optical transmittancy of the sensor disc changing either continuously and/or discontinuously in a selected diametral direction. The difference in the incident optical quantity caused by relative rotation of the disc and the elements causes generation of corresponding output from a detecting mechanism electrically coupled to the elements. The wide range of the detectable rotation angle enables advantageous use of the sensor for a navigation course finder, linear tracking arm system for record players, automatic steering system and weighing balance.