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:
Sep. 08, 1992
Filed:
Jul. 11, 1991
Willem G Opheij, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
A planar optical head is described, which comprises a detector grating (15) for scanning a surface, for example, a recording layer (2) in an optical record carrier (1). A radiation source (5) supplies a beam (6) which is coupled into a waveguide (9) by an input grating (7) and is formed to a focused scanning beam (11) by an output grating (10). A scanning focus (13) having an optimum shape and a high intensity is obtained by arranging, in the path of the beam reflected by the record carrier, a special detector grating (15) which deflects this beam towards a detection system (17).
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile