Optical scanner with a long fast access stroke

Details Optical scanner with a long fast access stroke Optical scanner with a long fast access stroke

1992-11-02

1994-02-22

Pascal, Robert J.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4423, 369 4415, 2502015, G11B 2110

Patent

active

052894428

ABSTRACT:
A device for optically scanning a surface (2) with a focal spot (11) formed by an objective lens (10). The objective lens is electromagnetically suspended in a stationary coil system (14) comprising a plurality of coil pairs located one behind the other in a given direction. The coil system can move the objective lens in five or six degrees of freedom. A radiation beam is displaced parallel to itself via a pivotal mirror (22) and a scanning lens (23) so as to track the movement of the objective lens in said direction. A communicator (96) drives only those coils of the coil system which are proximate to the objective system at a given moment.

REFERENCES:
patent: 4023033 (1977-05-01), Bricot et al.
patent: 4363116 (1982-12-01), Kleuters et al.
patent: 4638471 (1987-01-01), Van Rosmalen
patent: 5218587 (1993-06-01), Nomiyama et al.
"A Floating-Lens Actuator", published in Japanese Journal of Applied Physics, vol. 26 (1987) supplement 16-4, pp. 195-197.

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