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. 08, 2007
Filed:
Sep. 05, 2002
Johannes Leopoldus Bakx, Eindhoven, NL;
Gary Christopher Maul, Eindhoven, NL;
Johannes Leopoldus Bakx, Eindhoven, NL;
Gary Christopher Maul, Eindhoven, NL;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
Because of the reduced track pitch of DVD compared to that of CD, the running-OPC procedures (ROPC) currently used in CD-RW systems do not function well in recordable and rewritable DVD systems. The present invention proposes to use the reflected signal from the writing spot itself instead of the satellite spots used in the CD-RW running-OPC procedure. This is realized by sampling the RF-signal reflected from the writing spot at the high-reflective crystalline level. This sampled signal (α) is fed into a power control loop (a so-called α-loop) to keep it at a constant level.