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:
Feb. 23, 1999
Filed:
Jan. 23, 1997
Masaaki Sofue, Tokyo, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An optical disk presents unit an object lens from being affected by an external disturbance caused by a reversed moving direction of an optical head when information is recorded or reproduced to or from an optical disk. The last moving direction of an optical head which has arrived at a target position of an optical disk is detected and, if it is opposite to a moving direction of the optical head for recording or reproducing information, the moving direction is inverted to the recording/reproducing moving direction before the optical head starts recording or reproducing information. At the time when the optical head inverts the moving direction, recording or reproduction of the information is not started. Therefore, no vibration or shock is applied to an object lens at the beginning of a recording or reproducing operation which might cause errors.