Tracking/focusing device for positioning an optical lens unit

Details Tracking/focusing device for positioning an optical lens unit Tracking/focusing device for positioning an optical lens unit

1983-01-28

1986-03-04

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 45, 250201, H04N 5781, G11B 700, G11B 2100

Patent

active

045743690

ABSTRACT:
An optical disc player/recorder includes a composite coil device for controlling both tracking and focusing functions of a moveable objective lens unit. A bobbin having orthogonal coils is supported by spring members and holds the objective lens. A magnetic gap field intersects both coils and current through each controls the focusing position and tracking position of the lens.

REFERENCES:
patent: 4021101 (1977-05-01), Camerik
patent: 4193091 (1980-03-01), Kleuters et al.
patent: 4408313 (1983-10-01), Musha
patent: 4482988 (1984-11-01), Tsurushima et al.

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