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:
Jun. 11, 1996
Filed:
Jul. 25, 1994
Daisuke Ogata, Kobe, JP;
Shunji Oohara, Higashiosaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka-Fu, JP;
Abstract
An optical head assembly for an optical information reading and reproducing apparatus including a laser for emitting a laser beam directed so as to impinge upon an information carrier disc. Rays of light reflected from the information carrier disc is separated into a reproduction signal detecting beam and two servo signal detecting beams by a path separator prism. The reproduction signal detecting beam enters a reproduction signal detector while the servo signal detecting beams enter an image sensor. The image sensor is so positioned as to cause images of the light beams to assume a substantially equal size. By selecting pixels effective to properly detect focusing and tracking errors, various servo signals can be obtained in dependence on outputs from those pixels selected.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile