G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.1
G11B 7/28 (2006.01) F16C 39/06 (2006.01) G02B 7/04 (2006.01) G11B 7/08 (2006.01) G11B 7/085 (2006.01) G11B 7/09 (2006.01) H04N 5/76 (2006.01)
Patent
CA 1188797
ABSTRACT: An opto-electronic apparatus for writing and/ or reading recording tracks on a record carrier by means of a radiation beam comprises as objective mounted in an objective holder which is movable in accordance with a number of desired degrees of freedom by means of a bear- ing arrangement and comprises electomagnetic 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 com- prises electromagnetic bearing means for counteracting movement in accordance with at least one undesired degree of freedom and comprises an objective-position measuring device for supplying a positional-error sig- nal which represents the deviation of the objective holder in accordance with the undesired degree of free- dom 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 accord- ance with the undesired degree of freedom by means of electromagnetic levitation forces.
406874
Janssen Peter J.m.
Van Rosmalen Gerard E.
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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