Optical pickup for magneto optical recording apparatus

Details Optical pickup for magneto optical recording apparatus Optical pickup for magneto optical recording apparatus

1996-02-23

1998-05-05

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

360114, G11B 708

Patent

active

057485798

ABSTRACT:
An optical pickup magneto-optically records information on a magneto optical disc in cooperation with a magnetic head. The optical pickup is disposed at one surface side of the magneto optical disc while the magnetic head is disposed at the other surface side of the magneto optical disc during a recording operation of the magneto optical disc. The optical pickup is provided with: a light emission device for emitting a light beam; an optical system for guiding the emitted light beam; an objective lens for converging and focusing the guided light beam onto the optical disc; and an actuator holding the objective lens and having a magnetic circuit for actuating the objective lens to move in focusing and tracking directions respectively of the magneto optical disc by a magnetic force generated by the magnetic circuit. The magnetic circuit includes a magnetic flux generation device for generating a magnetic flux and a yoke for transmitting the generated magnetic flux in the magnetic circuit to generate the magnetic force. The optical pickup is further provided with: a base plate, to which the actuator is attached, having a wall portion prescribing an aperture through which the light beam passing the objective lens is transmitted; and a body case having a wall prescribing an internal space and an opening, which opens toward the magneto optical disc and which is covered by the base plate, for accommodating the light emission device, the optical system and the magnetic circuit.

REFERENCES:
patent: 4769806 (1988-09-01), Takamori
patent: 4956833 (1990-09-01), Kokado et al.
patent: 4959820 (1990-09-01), Horimai et al.
patent: 5126983 (1992-06-01), Ikegame et al.
patent: 5239532 (1993-08-01), Hensing et al.
patent: 5264968 (1993-11-01), Masunaga

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