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. 09, 2007
Filed:
Sep. 15, 2003
Hendrik Josephus Goossens, Shanghai, CN;
Teunis Willem Tukker, Eindhoven, NL;
Hendrik Josephus Goossens, Shanghai, CN;
Teunis Willem Tukker, Eindhoven, NL;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
An optical head for use in the scanning of a record carrier, the record carrier having data stored on data tracks therein on a plurality of information layers () at a plurality of depths within the record carrier. The optical head comprises: a movable optical element () arranged in an optical path to act upon a first radiation beam () and a second radiation beam () to provide the beams with a different displacement perpendicular to the optical path; and a lens system for focusing said first beam () at a first focal point (A) on a first information layer () of the record carrier and the focusing of the second beam () at a second different focal point (B) on a second information layer (), wherein a spacing, transverse to the data tracks, between said first and second focal points (A, B) is controllable by varying the configuration of the movable optical element.