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. 25, 1997
Filed:
Sep. 14, 1995
Applicant:
Inventor:
Ryo Ando, Tokyo, JP;
Assignee:
Sony Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369 50 ; 369 47 ;
Abstract
A recording or reproducing device for a disc shape recording medium of the type having wobbled grooves includes a circuit for reproducing the recording medium, a circuit for extracting groove information, comparing the frequency of the groove information with a predetermined value, and determining from the comparison if the spindle servo is in a runaway state, and a control circuit which disables a PLL circuit in a spindle servo control if a runaway state is detected to thereby stop the runaway state.