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. 07, 2000
Filed:
Nov. 05, 1997
Takayasu Muto, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
Even if an external disturbance resulting from a defect on a magneto-optical disk disturbs a loop for generating a reference clock and consequently a phase error is increased, it is possible to prevent data from being recorded on a magneto-optical disk by using an abnormal reference clock. A disk apparatus according to the present invention includes a rotating and driving means for rotating and driving a disk, data recording/reproducing means having a head which can be moved in the radial direction of the disk for recording and reproducing data on and from the disk, reference clock information generating means for generating a reference clock information utilized when data is recorded on and reproduced from the disk, clock control means for generating a phase error information indicative of a phase error between a phase information obtained based on rotation of the disk and the reference clock information and for controlling the reference clock generating means based on the phase error information, threshold value discriminating means for discriminating whether the phase error exceeds a predetermined threshold value, and data recording/reproduction control means for controlling the data recording/reproducing means based on an output result of the threshold value discriminating means.