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. 02, 2002
Filed:
Jun. 24, 1999
Applicant:
Inventor:
Yoshiaki Kojima, Tsurugashima, JP;
Assignee:
Pioneer Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B 7/00 ;
U.S. Cl.
CPC ...
G11B 7/00 ;
Abstract
A recording apparatus of a master disc of optical discs which can irradiate a recording beam to a preferable position on the master disc even when a vibration occurs in a rotary shaft to hold the master disc or when a rotational fluctuation occurs in a spindle motor. An angle position in the rotating direction of the rotary shaft and a displacement of the rotary shaft in a radial direction of the master disc are detected. Based on the angle position and the displacement, the present deviation at the present angle position from the reference position of the rotary shaft is calculated. Based on the present deviation, the irradiating spot position is adjusted.