Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
1988-08-24
1990-03-27
Arnold, Bruce Y.
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
369 45, G02B 702, G11B 509
Patent
active
049115340
ABSTRACT:
The optical unit comprises a frame (1), a subrame (3), and objective holder (5) having an objective (7) for concentrating the radiation beam so as to form a radiation spot. First connecting means (11) movably connect the objective holder to the subrame, which first connecting means allow focussing movements of the objective and counteract other movements. Second connecting means (9) movably connect the subframe to the frame, which second connecting means allow radial tracking movements of the objective and counteract other movements. Electrically controllable first focussing means (19), connected to the frame and electrically controllable second focussing means (21) connected to the objective holder cooperate with each other to produce the focussing movements. Electrically controllable first tracking means (19) connected to the frame and electrically second tracking means (25) connected to the objective holder cooperate with each other to produce the tracking movements, and a reflecting surface (13) provided on the subframe directs the radiation beam towards the objective.
REFERENCES:
patent: 4449213 (1984-05-01), Noborimoto et al.
patent: 4596444 (1986-06-01), Ushida
patent: 4641296 (1987-03-01), Mizuhoe et al.
patent: 4653856 (1987-03-01), Kamiko
patent: 4679904 (1987-07-01), Kurihara
Beyersbergen van Henegouwen Cornelis M.
Blankers Petrus J.
Van Gestel Henricus M. C.
Arnold Bruce Y.
Kachmarik Ronald M.
U.S. Philips Corporation
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