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:
Aug. 28, 2007
Filed:
Aug. 15, 2004
Yung-chih LI, Taipei Hsien, TW;
Hsueh-kun Liao, Hsin-Chu Hsien, TW;
Ching-chuan Hsu, Hsin-Chu Hsien, TW;
Yung-Chih Li, Taipei Hsien, TW;
Hsueh-Kun Liao, Hsin-Chu Hsien, TW;
Ching-Chuan Hsu, Hsin-Chu Hsien, TW;
Mediatek Incorporation, Hsin-Chu, Hsien, TW;
Abstract
A laser power controller for performing an auto power control to control the laser power of an optical pick-up unit (OPU) includes: a sample/hold circuit used for sampling and holding a front photodiode output signal to generate an analog feedback signal; an analog-to-digital converter (ADC) electrically coupled to the sample/hold circuit for transferring the analog feedback signal into a digital feedback signal; and a digital control circuit electrically coupled to the ADC for generating a power control signal and outputting the power control signal to the OPU in order to control the laser power of the OPU. The front photodiode output signal corresponds to the laser power of the OPU.