Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1994-03-28
1995-05-02
Epps, Georgia Y.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
2502015, G11B 700
Patent
active
054126347
ABSTRACT:
A scanning device for recording/reading data in data tracks of a recording medium includes a light source supported by a tracking head for guiding a light beam along the data tracks. The data tracks are rotated and the beam is focussed onto the data tracks. The light source is moved at an angle .alpha. with respect to the radial direction of motion of the data tracks. An optical element directs the light beam to the recording medium and directs light reflected from the recording medium to a detector. An astimatic element is arranged between the optical element and the detector. The scanning device is improved in that the astimatic element has one axis arranged at the angle .alpha. with respect to the radial direction of motion.
REFERENCES:
patent: 4011400 (1977-03-01), Simons et al.
patent: 4293944 (1981-10-01), Izumita et al.
patent: 4767921 (1988-08-01), Kawasaki et al.
patent: 4815060 (1989-03-01), Nomura
Patent Abstract of Japan 58-1460333, Aug. 31, 1983, 9, p. 239.
Patent Abstract of Japan 58-146034, Aug. 31, 1983, 9, p. 239.
Buchler Christian
Morimoto Yasuaki
Deutsche Thomson-Brandt GmbH
Epps Georgia Y.
Huber P. W.
Tripoli Joseph S.
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