Opto-electronic apparatus for inscribing and/or reading recordin

Details Opto-electronic apparatus for inscribing and/or reading recordin Opto-electronic apparatus for inscribing and/or reading recordin

1981-10-21

1985-12-24

Psitos, Aristotelis M.

Dynamic information storage or retrieval

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

Mechanism control by the control signal

369 46, G11B 700, G11B 2110

Patent

active

045610819

ABSTRACT:
An opto-electronic apparatus for inscribing and/or reading recording tracks on a record carrier by means of a radiation beam comprises an objective mounted in an objective holder. The objective holder is supported in a frame by bearing arrangement for movement in accordance with a number of desired degrees of freedom and the apparatus includes electromagnetic actuator means for driving the objective holder in accordance with the desired directions of movement. The bearing arrangement of the objective holder on the frame comprises electromagnetic bearing means for counteracting movements in accordance with at least one undesired degree of freedom. An objective-position measuring device supplies a positional error signal which represents the deviation of the objective holder in accordance with the undesired degree of freedom relative to the frame and which is utilized by a levitation control circuit which counteracts movements of the objective holder relative to the frame in accordance with the undesired degree of freedom by means of electromagnetic levitation forces.

REFERENCES:
patent: 4135083 (1979-01-01), Van Alem et al.
patent: 4135206 (1979-01-01), Kleuters et al.
patent: 4175832 (1979-11-01), Umeki et al.
patent: 4302830 (1981-11-01), Hamaoka et al.
patent: 4321701 (1982-03-01), Arquie et al.
patent: 4374324 (1983-02-01), Van Rosmalen et al.
patent: 4419614 (1983-12-01), Kimura

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