Objective lens driving device and optical disc apparatus

Details Objective lens driving device and optical disc apparatus Objective lens driving device and optical disc apparatus

2007-12-19

2010-11-16

Chow, Lixi (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044150

Reexamination Certificate

active

07835234

ABSTRACT:
Both of two permanent magnets which are arranged in an objective lens driving device are multipole magnetized magnets having rectangular parallelepiped shapes. The two permanent magnets have inverse N-S polarity at a part of surfaces which face each other. Focusing coils and tracking coils which are set up on a lens holder are disposed such that effective portions which are sides of the respective coils that face each other to generate driving force by electromagnetic force action with the permanent magnets, act with different direction magnetic fields respectively.

REFERENCES:
patent: 6344936 (2002-02-01), Santo et al.
patent: 7203951 (2007-04-01), Kawano et al.
patent: 2004/0190402 (2004-09-01), Matsui
patent: 2005/0147000 (2005-07-01), Kim et al.
patent: 2007/0147197 (2007-06-01), Huang et al.
patent: 1 124 222 (2001-08-01), None
patent: 1 367 576 (2003-12-01), None
patent: 2002-237067 (2002-08-01), None
patent: 2006-024266 (2006-01-01), None
patent: WO 2005/066945 (2005-07-01), None

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