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:
Sep. 01, 1992
Filed:
Oct. 28, 1991
Tsuguo Sato, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
A capstan servo device comprising a frequency generator for detecting the rotation rate of a capstan motor and generating two-phase FG signals mutually having a 90.degree. phase difference; a selector for selecting one of input four-phase signals produced from the two-phase FG signals and mutually having a 90.degree. phase difference; and a sync signal generator including an N-bit counter (where N.gtoreq.2) to receive a reference frequency signal inputted thereto and generating a sync signal by phase-comparing the two high-order bits of the frequency-divided output of the counter with the two-phase FG signals. In this device, the rotation speed of the capstan motor is controlled in accordance with an error voltage signal selected by the selector in response to the sync signal.