Objective lens actuator and optical disk apparatus

Details Objective lens actuator and optical disk apparatus Objective lens actuator and optical disk apparatus

2005-07-07

2008-09-02

Hindi, Nabil Z (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

Reexamination Certificate

active

07420890

ABSTRACT:
An objective lens actuator of the present invention is an actuator capable of driving an objective lens which condenses a laser beam on an information recording surface of an optical disk, in each of a focusing direction, a tracking direction and a radial tilt direction. The actuator comprises a fixed unit including first and second magnets, and a moving unit which is arranged between the first and second magnets and which includes the objective lens, focusing coils, tracking coils, and a radial tilt coil. Each of the magnets is divided into four areas and being magnetized such that adjacent areas have opposite poles N and S, respectively. A direction of the magnetization is orthogonal to the focusing direction and tracking direction.

REFERENCES:
patent: 7266055 (2007-09-01), Cho et al.
patent: 2003-257056 (2003-09-01), None

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