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. 07, 2002
Filed:
Dec. 30, 1998
In Ho Choi, Kyungki-do, KR;
Seong Pyo Hong, Seoul, KR;
LG Electronics Inc., Seoul, KR;
Abstract
An actuator for optical pick-up using the concentrated magnetization method that is capable of moving an objective lens converging a laser light beam onto an optical disc. In the actuator, a lens holder is attached to the objective lens. Coils are wound around the lens holder to receive a current. A permanent magnet constructs a magnetic circuit along with the coils to generate a driving force for the objective lens and is magnetized to concentrate a magnetic flux toward the coils. The actuator can improve a driving sensitivity in a wide frequency band with the aid of the permanent magnet in which a magnetic flux density concentrates on the effective surfaces of the coils.