Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1985-06-13
1987-10-06
Faber, Alan
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
250202, 358907, 360 101, G11B 7095
Patent
active
046987959
ABSTRACT:
A tracking servo device for controlling the relative position in the radial direction of a recorded disc between an information reading point of a pick-up and a recorded track having an improved accuracy in performing track-jumping operations. In accordance with the invention, the track jumping operations are performed only in response to a tracking error signal, that is, without the use of a jump drive signal or brake signal, whereby fine control and adjustment of various signals within the circuit are made unnecessary and accurate and quick track jumping operations are ensured. To achieve this, an in-phase and an out-of-phase signal with respect to the tracking error signal are produced and alternately selected through a switch. The levels of the signals applied to the switch may be clamped to prevent them from passing through zero. The selection operation performed by the switch is controlled in accordance with the level of the tracking error signal, specifically, switching is effected when the tracking error signal exceeds a zero reference level.
REFERENCES:
patent: 4340950 (1982-07-01), Kosoba
patent: 4545003 (1985-10-01), Hirano
patent: 4587644 (1986-05-01), Fujire
Faber Alan
Pioneer Electronic Corporation
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