Objective lens driving device and optical disk apparatus

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

2007-03-20

2007-03-20

Tran, Thang V. (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044220

Reexamination Certificate

active

10616266

ABSTRACT:
Tracking coils are attached to outer surfaces of two focusing coils. Inside the focusing coils, a first magnet and a second magnet are arranged respectively. A third magnet is arranged so as to face the first magnet and the second magnet via the tracking coils. An open end of a first yoke for holding the first magnet and an open end of a second yoke for holding the second magnet are connected by a bridging yoke. Since a magnetic flux is formed in the bridging yoke, pitching vibrations can be suppressed and a driving sensitivity improves owing to an increase in an effective magnetic flux.

REFERENCES:
patent: 5657172 (1997-08-01), Shibata et al.
patent: 5706272 (1998-01-01), Ezawa
patent: 5905255 (1999-05-01), Wakabayashi et al.
patent: 6570720 (2003-05-01), Kawano
patent: 6788638 (2004-09-01), Choi
patent: 2002/0071189 (2002-06-01), Ohno
patent: 10-124901 (1998-05-01), None
patent: 11-283258 (1999-10-01), None
patent: 11-312327 (1999-11-01), None

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