Electro-magnetic actuator for driving an objective lens

Details Electro-magnetic actuator for driving an objective lens Electro-magnetic actuator for driving an objective lens

1993-06-30

1995-02-07

Psitos, Aristotelis

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4416, 359814, 359824, G11B 700

Patent

active

053880862

ABSTRACT:
In an optical head which comprises a focusing unit section for moving an objective lens, used to focus a light beam on a recording medium, in a direction perpendicular to the recording medium, and a tracking unit section for moving the focusing unit section in a direction perpendicular to an information track on the recording medium, a lens holder for supporting the objective lens is fixed to two leaf springs, and a carriage body is disposed between the two leaf springs. The leaf springs and the central portion of a tracking coil are fixed to the carriage body. The tracking coil has stepped portions at its central portion, and its whole structure except the central portion is flat.

REFERENCES:
patent: 4545046 (1985-10-01), Jansen et al.
patent: 4911534 (1990-03-01), Beyersbergen van Henegowen et al.
patent: 5136558 (1992-08-01), Getreuer et al.

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