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:
Oct. 27, 1987
Filed:
Nov. 01, 1984
Yoshikiyo Konno, Saitama, JP;
Pioneer Electronic Corporation, Tokyo, JP;
Abstract
A device and method for controlling the movement of a focusing lens of an apparatus for reading an optical disk in which the focusing lens is positively prevented from striking the surface of the disk. The presence or absence of the establishment of a focus servo control mode is detected when the focusing lens is moved from a most wide position to the vicinity of the normal operative position. If the focus servo control mode is not established when the focusing lens has been moved to the vicinity of the normal operative position, the focusing lens is then moved away from the disk. Then, the focusing lens is moved towards the disk one more time, and the procedure is repeated.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile