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:
Apr. 17, 1990
Filed:
Jan. 20, 1988
Applicant:
Inventor:
Wai-Hon Lee, Cupertino, CA (US);
Assignee:
Pencom International Corporation, Sunnyvale, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369 13 ; 369112 ;
Abstract
A magneto-optical head using a laser source unit with a focus error and a tracking error detector in substantially the same optical path as the originating laser beam. In this invention the stored information is derived from the beam reflected by a beam-splitter, while the transmitted light is utilized for generating the tracking error and the focus error signals.