Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1987-05-18
1990-06-05
Stephan, Steven L.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369109, 369124, G11B 700
Patent
active
049320157
ABSTRACT:
A method of reproducing signals formed in slant surfaces of a V-shaped track groove formed in an optical disk. The beam reflected from each slant surface has a portion having a small crosstalk component and a portion having a large crosstalk component, the portions existing separately. The beam reflected from the V-shaped track groove is detected by a photodetector which is composed of two photodetector units. Thus, the output from the first photodetector unit has a small crosstalk component, while the output from the second photodetector unit has a large crosstalk component. The reproduced signal is obtained by subtracting, from a signal formed by amplifying the output of the first photodetector unit, a signal formed by amplifying the output of the second photodetector unit, so that the crosstalk component in the signal from the first photodetector unit is negated by the crosstalk component in the signal from the second photodetector unit, so that the reproduced signal can have a reduced crosstalk component. At the same time, the strictness of requirement for design and positional accuracy of the photodetector is reduced. It is also to arrange such that signals are simultaneously and independently reproduced from adjacent slant surfaces of the V-shaped track groove by a single laser beam spot.
REFERENCES:
patent: 4310916 (1982-01-01), Dil
patent: 4569038 (1986-02-01), Nagashima
patent: 4589103 (1986-05-01), Tajima
patent: 4674070 (1987-06-01), Tajima
"TeO.sub.x Thin Films for An Optical Disc Memory", Mutsuo Takenaga et al., J. Appl. Phys., vol. 54, No. 9, Sep. 1983, pp. 5376-5380.
Nagashima Michiyoshi
Takemura Yoshinari
Matsushita Electric Corp., Ltd.
Stephan Steven L.
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