Objective lens driving device and optical pickup device

Details Objective lens driving device and optical pickup device Objective lens driving device and optical pickup device

2008-09-01

2011-10-18

Psitos, Aristotelis (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C720S683000, C359S824000

Reexamination Certificate

active

08040763

ABSTRACT:
An objective lens driving device includes a lens holder (3) holding an objective lens (1, 2), a stationary part (5) that supports the lens holder (3) via wires (7a,7b), an electromagnetic coil (11a-11d,12a-12d) provided on the lens holder, and a magnet (4a,4b) provided on the stationary part and magnetized in a multipolar manner so that different magnetic pole surfaces are arranged on a surface of the magnet facing the electromagnetic coil. The lens holder has a convex portion (16a-16d,17a-17d) on a surface thereof facing the magnet. The convex portion has at least one groove (601-604, 701-704) portion extending parallel to a direction of magnetic flux lines of the magnet facing the convex portion, and at least a surface of the convex portion is formed of material having magnetic property.

REFERENCES:
patent: 2003-67950 (2003-03-01), None
patent: 2003-178479 (2003-06-01), None
patent: 2004-265514 (2004-09-01), None
patent: 2005-92949 (2005-04-01), None
patent: 2005-182926 (2005-07-01), None

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