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:
Aug. 19, 1986
Filed:
Jun. 11, 1984
Hiroshi Matsunaga, Furukawa, JP;
Yoji Shimojima, Furukawa, JP;
Ichiro Tokunaga, Furukawa, JP;
Kosei Obata, Miyagi, JP;
Yukihiko Yasuhara, Miyagi, JP;
Alps Electric Co., Ltd., , JP;
Abstract
A device for detecting rotating speed of a thin shape motor including a vertical shaft rotatably supported on a base plate, a rotor of a planar shape secured to the vertical shaft in a spaced apart relation from the base plate, and a stator provided downwardly from the rotor on the base plate, comprises a rotatable disc of a diameter smaller than that of the rotor secured to the vertical shaft and having speed detecting indices on a peripheral surface thereof, and a luminous element and a light-receiving element provided outwardly of the rotor. A light-projecting optical fiber and a light-receiving optical fiber are further provided to extend along the base plate such that one end of the light-projecting optical fiber is located to oppose the luminous element, while one end of the light-receiving optical fiber is located to oppose the light-receiving element, and that the other ends of the two optical fibers are placed in opposition to the peripheral surface of the rotatable disc.