Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1995-08-07
1997-09-23
Tran, Thang V.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4429, 369 4435, G11B 709
Patent
active
056712006
ABSTRACT:
An optical information reproduction apparatus for reproducing information from a disc having a plurality of tracks storing the information in the form of pits includes a radiation device for radiating a light beam toward the disc to form a light spot on the disc; a moving device for moving the radiation device to move the light spot in a direction crossing the plurality of tracks in a radial direction of the disc; a photodetector having a detecting plane for receiving the light beam reflected by the disc, the detecting plane being divided into four detection areas at least in a direction parallel to a tangent of the tracks and in a direction perpendicular to the tangent of the tracks, the four detection areas generating light intensity signals corresponding to the intensities of the light beam which is received; a positional offset detector for detecting a positional offset of the light spot with respect to one of the tracks based on the light intensity signals generated by the photodetector and outputting the detection result as a positional offset signal; a signal processor for performing processing of the light intensity signals including logic operation to obtain an operation signal; and a direction detector for detecting a direction in which the light spot moves with respect to a target track based on the positional offset signal and the operation signal during the movement of the light spot toward the target track.
REFERENCES:
patent: 4106058 (1978-08-01), Romeas et al.
patent: 4332022 (1982-05-01), Ceshkovsky et al.
patent: 5311490 (1994-05-01), Matoba et al.
patent: 5335214 (1994-08-01), Matoba et al.
patent: 5444682 (1995-08-01), Yamada et al.
Ishibashi Hiromichi
Kanda Yoshihiro
Moriya Mitsuro
Yamaguchi Hiroyuki
Yamaguchi Osamu
Matsushita Electric - Industrial Co., Ltd.
Tran Thang V.
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