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. 13, 2008
Filed:
Oct. 20, 2003
Jun-hyuk Lee, Gyeonggi-do, KR;
Chui-ho Jeon, Gyeonggi-do, KR;
Dong-ryul Lee, Seoul, KR;
Sung-du Kwon, Seoul, KR;
Jun-hyuk Lee, Gyeonggi-do, KR;
Chui-ho Jeon, Gyeonggi-do, KR;
Dong-ryul Lee, Seoul, KR;
Sung-du Kwon, Seoul, KR;
Samsung Electronics Co., Ltd., Suwon-Si, KR;
Abstract
An apparatus for controlling a monitor photo diode (PD) of an optical pickup system monitors an optical power signal output for writing data on or reading data from a disk. The apparatus includes a comparator which compares a voltage signal corresponding to the optical power signal output from the LD with a predetermined reference voltage signal, and a gain selector which selectively issues a gain output from the comparator depending on the type of the optical power signal output from the LD.