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:
Dec. 08, 2009
Filed:
Jan. 27, 2005
Hyung-joo Kang, Seoul, KR;
Byung-youn Song, Suwon-si, KR;
Pyong-yong Seong, Seoul, KR;
Dae-jong Jang, Ayang-si, KR;
Hyung-joo Kang, Seoul, KR;
Byung-youn Song, Suwon-si, KR;
Pyong-yong Seong, Seoul, KR;
Dae-jong Jang, Ayang-si, KR;
Samsung Electronics Co., Ltd., Suwon-Si, KR;
Abstract
A magnetic circuit, an optical pickup actuator, an optical recording and/or reproducing apparatus using the magnetic circuit, and method of the same, wherein the magnetic circuit includes a plurality of focus coil units each of which includes a first focus coil and a second focus coil, and a magnet including a plurality of magnet portions which interact with the plurality of focus coil units and each of which is polarized in a direction opposite to adjacent magnet portions thereamong. Here, electromagnetic forces act on the first and second focus coils in each focus coil unit in a same direction in response to focus driving signals and in opposite directions in response to tilt driving signals, with the first and second focus coils in each focus coil unit have different effective coil lengths.