Track jump control circuit

Details Track jump control circuit Track jump control circuit

1992-06-16

1994-02-08

LaRoche, Eugene R.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 32, 369 4425, 369 4428, 369239, G11B 2110

Patent

active

052854329

ABSTRACT:
A track jump control circuit having a pick-up for reading information stored on a disc, a motor for moving the pick-up in a radial direction of the disc, a speed detector for detecting the moving speed of the pick-up and for outputting a speed signal, an integration circuit for generating a signal according to the moving amount of the pick-up according to the speed signal being detected, a reference voltage generation circuit for generating a reference signal according to the distance for which the pick-up is moved in a track jump mode, a comparator for comparing the reference signal with the signal according to the moving amount and for sending a difference signal to the motor, and a controller for stopping sending the difference signal to the motor when the difference signal is in a predetermined range. When the difference signal between the reference signal and the signal according to the moving amount is in the predetermined range, the completion of the track jump operation is determined. Thus, the determination of the completion of the track jump operation is not much affected by an external vibration.

REFERENCES:
patent: 4236232 (1980-11-01), Jansen et al.
patent: 4268745 (1981-05-01), Okano
patent: 4513406 (1985-04-01), Ishihara
patent: 4730298 (1988-03-01), Takahashi
patent: 4731771 (1988-03-01), Maeda et al.
patent: 4748607 (1988-05-01), Nakane
patent: 4796247 (1989-01-01), Vogelsang
patent: 4839876 (1989-06-01), Fennema
patent: 4896310 (1990-01-01), Wachi
patent: 4937803 (1990-06-01), Nakane
patent: 4955016 (1990-09-01), Nabeshima et al.

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