Access and tracking device for an optical disc

Details Access and tracking device for an optical disc Access and tracking device for an optical disc

1994-10-14

1997-04-01

Levy, Stuart S.

Dynamic information storage or retrieval

Dynamic mechanism subsystem

Having power driven transducer assembly

369249, 369 4414, G11B 709, G11B 7085, G11B 2102

Patent

active

056174020

ABSTRACT:
The present invention relates to various improvements to a device for access and tracking to a track carried by an information medium, the information being readable and/or recordable optically by a focused radiation, this track forming, on the medium, regularly-spaced or variably spaced revolutions, the revolutions forming a spiral or having the form of concentric circular elements, the device comprising an optical head (1) with optical axis A orthogonal to the plane of the medium, a fixed magnetic circuit comprising at least one core (7) secant to the set of revolutions of the track, in the gap of which two coils (14, 15) move permitting respectively track access and radial tracking to be achieved, as well as focusing of the radiation onto the track, the optical head and the two coils being fixed rigidly to one another in such a way as to form a single compact mobile unit.
According to one improvement, the two coils (14, 15) are set in a symmetric arrangement, the desired movement being obtained by addition of forces (F, F') induced by the currents flowing in the coils.

REFERENCES:
patent: 4399529 (1983-08-01), Leterme et al.
patent: 4570249 (1986-02-01), Malissin et al.
patent: 4574369 (1986-03-01), Koide et al.
patent: 4702555 (1987-10-01), Iguma et al.
patent: 4773062 (1988-09-01), Wade et al.
patent: 4864170 (1989-09-01), Eguchi
patent: 4878214 (1989-10-01), Hinotani
patent: 4891799 (1990-01-01), Nakano
patent: 4922477 (1990-05-01), Miura
patent: 4958335 (1990-09-01), Takeda
Attached is a list of the inventors U.S. applications (1 page).

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