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:
May. 31, 2005
Filed:
Jun. 20, 2001
Aik Seng Yak, Singapore, SG;
Wooi Liang Chin, Singapore, SG;
Canniputhur Santhana Krishnan Sanjay Krishnan, Chennai, IN;
Aik Seng Yak, Singapore, SG;
Wooi Liang Chin, Singapore, SG;
Canniputhur Santhana Krishnan Sanjay Krishnan, Chennai, IN;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
A device for recording and/or reproducing an optical record carrier (), comprises an optical system for projecting a first, a second and a third optical beam at a first (), a second () and a third spot () at the record carrier (). The device further comprises detection elements primary position signals (D, C, D) which is indicative for an amount of radiation reflected by the record carrier at said thoses spots (). The device further comprises signal processing means () for generating a plurality of secondary position signals (S, S, S, S) in response to the primary position signals (D, C, D). A selection element () selects one of the position signals (S, S, D, S, S) as an output signal (WRE) in response to a selection signal (SEL). The selection signal (SEL) is derived from the output signal (WRE) of the selection element ().