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:
Mar. 27, 2012
Filed:
Mar. 22, 2006
Chee Kang Thong, Singapore, SG;
Rain Zhang, Singapore, SG;
Chee Kang Thong, Singapore, SG;
Rain Zhang, Singapore, SG;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
The invention relates to a method for preventing interchange of a first optical information carrier () with a second optical information carrier in an optical drive. Initially, the light () is focused at the first optical information carrier () in the optical apparatus followed by the steps of detecting reflected light () from the first optical information carrier () and generating a plurality of signals (CA, RF, FE) from the detected light (), such as a focus error signal (FE). Upon obtaining an indication of a signal, e.g. the focus error signal (FE), is absent or reduced below a certain level, there is a step of assessing if the first optical information carrier () has been removed from the optical drive. If removed, reproduction of information by the optical drive is made impossible until some pre-determined measures have been taken, e.g. restart of the optical drive or other measures.