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. 10, 2002
Filed:
Nov. 14, 2000
Chin-Sung Liu, Miou-Li, TW;
Li-Chung Peng, Shin-Chu, TW;
Abstract
An electromagnetic actuator for efficiently moving an objective lens along a focusing direction and a tracking direction. The electromagnetic actuator includes a flux generator, a first set of coils, a second set of coils and a magnetic piece. A first magnetic part and a second magnetic part of the flux generator are placed within a gap for generating smooth magnetic lines of force. The first set of coils moves the objective lens along the focusing direction. The second set of coils provide micro rotation around a shaft to the objective lens, and magnetic pieces are placed in the magnetic circuit adjacent to the gap. The objective lens holder is held at the neutral position relating focusing and tracking directions while the magnetic attraction forces are acting on the magnetic pieces.