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. 30, 1991
Filed:
Dec. 21, 1988
Applicant:
Inventor:
Takashi Okano, Saitama, JP;
Assignee:
Pioneer Electronic Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369 50 ; 369 4425 ; 360 7303 ;
Abstract
A spindle servo unit for disk playing device detects a synchronizing signal in an information signal read from a recording disk and generates a signal synchronized with the detected synchronizing signal. The generated signal is frequency-divided. An error signal is generated in accordance with the phase difference between the frequency-divided output, and the error signal is supplied to rotate the recording disk.