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. 01, 1978
Filed:
Sep. 11, 1975
Takeshi Goshima, Tokyo, JP;
Yoshinori Sugiura, Kawasaki, JP;
Kiyonobu Endo, Yokohama, JP;
Hideaki Sato, Yokohama, JP;
Kimio Kono, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A speed control device for a moving member which comprises a moving member, driving mechanism for the moving member, position coherent light containing a position information of the moving member, reference coherent light so formed as to not containing the position information of the moving member for required formation of the position coherent light and an interference light, interference light forming means utilizing the position coherent light and the reference coherent light, means for detecting interference light formed by the interference light forming means, and controlling means for the driving means to render the detected output obtained by the detection means to become a sinusoidal wave having a predetermined frequency.