Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1995-05-15
1997-06-03
Young, W. R.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4437, 369 4441, 369 94, G11B 709
Patent
active
056361904
ABSTRACT:
An optical pickup system for regenerating information stored on a hologram disk including a pair of recording surfaces thereon, includes a first and a second light sources, an optical detection unit having a first and a second detectors, a diffraction device including a crystal base, a first and a second diffraction elements, a beam splitter, disposed between the first detector and the hologram disk, an objective lens, disposed between the beam splitter and the hologram disk, and a signal detection unit having a first and a second signal detection circuits, wherein the second light source is used for reproducing a regenerated information signal on the second recording surface of the hologram disk and the first light source is used for detecting a tracking error and a focusing error off the first recording surface of the hologram disk.
REFERENCES:
patent: 4904856 (1990-02-01), Nagahama et al.
patent: 4908813 (1990-03-01), Ojima et al.
patent: 4918300 (1990-04-01), Tsuji et al.
patent: 5381401 (1995-01-01), Best et al.
patent: 5408453 (1995-04-01), Holtslag et al.
Daewoo Electronics Co. Ltd.
Young W. R.
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