Objective lens-driving unit

Details Objective lens-driving unit Objective lens-driving unit

1987-06-22

1988-11-01

McElheny, Jr., Donald

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369112, 360114, G11B 712

Patent

active

047824760

ABSTRACT:
An objective lens-driving unit comprising a lens supporting means for supporting the objective lens having an optical axis vertical to a recording medium on which light beams converge through the objective lens so as to attain optical recording, optical playing and optical erasing of information on the recording medium; at least one driving means for driving said lens supporting means in the tracking direction; a driving means for driving said intermediate supporting means in the focusing direction, wherein said tracking direction-driving means comprises a magnetic circuit that produces magnetic flux in the circumferential direction of the recording medium, and a tracking direction-driving coil that is positioned to cross a gap formed in the magnetic circuit to thereby receive an electro-magnetic force due to an interaction between the magnetic field of the magnetic circuit and the current passing through said coil, said tracking direction-driving coil being positioned within the excitation area of the magnetic circuit even when said coil moves in the focusing direction.

REFERENCES:
patent: 4321701 (1982-03-01), Arquie et al.
patent: 4574369 (1986-03-01), Koide et al.
patent: 4658390 (1987-04-01), Fujii et al.
patent: 4679904 (1987-07-01), Kurihara

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