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:
Nov. 27, 2001
Filed:
Oct. 25, 2000
Hirokazu Sakuma, Tokyo, JP;
Takashi Okamuro, Tokyo, JP;
Yoichi Ohmura, Tokyo, JP;
Yukio Aoki, Tokyo, JP;
Toshikazu Satone, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
An absolute-value encoder device for detecting a plurality of rotation quantities is disclosed. An A/B phase forming portion,forms an A-phase pulse signal and a B-phase pulse signal, based on light passing through a slit rotating together with a rotary shaft. One period of each of those pulse signals corresponds to one revolution of a rotary shaft. The A- and B-phase pulse signals are displaced in phase by 90° from each other. When an A/B-phase state detecting portion,detects a state change of each of those pulse signals, a clock forming portion,changes a frequency of a clock pulse signal to another frequency.