Beam spot speed detecting system for an optical disk apparatus

Details Beam spot speed detecting system for an optical disk apparatus Beam spot speed detecting system for an optical disk apparatus

1997-12-10

2000-02-15

Hindi, Nabil

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

G11B 700

Patent

active

060260661

ABSTRACT:
The speed detecting system 12 detects the beam spot speed relative to the optical disk 1 on the basis of track count pulses and reference clock pulses. The period of each track count pulse is the time taken in order for the beam spot to traverse a track. The reference clock pulses include first pulses, which are shorter in period than the track count pulses, and second pulses, which are longer in period than the track count pulses. In an area where the beam spot speed is low, the reference clock count method for counting the number of first pulses per track count pulse is used. In an area where the beam spot speed is high, the traverse count method for counting the number of track count pulses per second pulse is used.

REFERENCES:
patent: 4788421 (1988-11-01), Ogawa et al.
patent: 5193081 (1993-03-01), Osawa et al.
patent: 5220547 (1993-06-01), Yasukawa et al.

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