Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1996-04-15
1998-08-18
Young, W. R.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 54, G11B 7095
Patent
active
057966850
ABSTRACT:
A digital servo circuit generating a digital RF signal in accordance with the intensity of a reflected light of light irradiated to a surface of a recording medium by an optical pickup and generating a mirror-surface detection signal based on a peak level and bottom level of the digital RF signal. The circuit includes a peak level counter which performs a comparison between the potential of the digital RF signal and a first potential held in advance and, when the potential of the digital RF signal is larger than the first potential, holds the potential of the digital RF signal as the first potential and, when otherwise, performs a down count at a speed in accordance with an enable signal; a bottom level counter which performs a comparison between the potential of the digital RF signal and a second potential held in advance and, when the potential of the digital RF signal is larger than the second potential, holds the potential of the digital RF signal as the second potential and, when otherwise, performs an up count at a speed in accordance with an enable signal; and a count speed selection circuit which selects the speed of the count in accordance with the speed of movement of the irradiated spot of light irradiated to the surface of the recording medium and supplies the same as the enable signal to the bottom level counter or the peak level counter.
REFERENCES:
patent: 4835756 (1989-05-01), Kaku et al.
patent: 5073885 (1991-12-01), Ito et al.
patent: 5239530 (1993-08-01), Seo et al.
Noda Hidenobu
Suda Yasuyuki
Kananen Ronald P.
Young W. R.
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