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:
Jan. 03, 1989
Filed:
May. 20, 1988
Hiroshi Ozaki, Amagasaki, JP;
Kouichi Ikebe, Amagasaki, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A tracking error signal is generated by a far field system utilizing light for writing and reading of data. The true tracking error signal is retrieved from this tracking error signal by removing the position fluctuation component in the direction of tracking of the objective lens. A holding member that is supported on a frame and holds the objective lens is driven in the tracking direction in accordance with this true tracking error signal. In order to detect position fluctuation in the tracking direction of the objective lens, the light for position detection that is output from the holding member is detected by a photodetector fixed on a cover. The mounting position of the cover with respect to the frame is adjustable by rotating the cover, using the guide part formed on the frame.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile