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:
Jul. 12, 1988
Filed:
Sep. 25, 1984
Koichi Yamada, Hyogo, JP;
Takahiro Kubo, Hyogo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
An optical encoder and a method for producing the same in which each slit on a pulse scale of the encoder, which is an encoder wheel in the case of a rotary type encoder, is formed as a plurality of parallel grooves. The grooves are formed by depositing a thin layer of a reflective and chemically stable metal such as chromium or aluminum on a transparent plate and scanning the metal film with a laser while moving the plate and on/off modulating the laser to evaporate portions of the film. The laser is moved for each line of grooves, radially in the case of an encoder wheel.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile