Start-control method and circuit for optical disc play-back syst

Details Start-control method and circuit for optical disc play-back syst Start-control method and circuit for optical disc play-back syst

1985-05-06

1987-04-07

Psitos, Aristotelis M.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 46, G11B 708

Patent

active

046566171

ABSTRACT:
Start-control method and circuit for an optical disc play-back system according to this invention can allow the starting current of the system to be reduced considerably. The method includes the steps of loading the disc onto a disc drive motor, then finding the focal position of the lens, then powerfully energizing the disc drive motor for a certain period of time so as to start the disc spinning and then energizing the focus- and the tracking-servo circuits during inertial rotation of the disc drive motor. The circuit includes a disc-drive-motor servo switch capable of switching the power supply for the disc drive motor from the kick circuit to the disc-drive-motor servo circuit, a focus servo switch capable of switching the power supply for the focus servomotor from the focus search circuit to the focus servo circuit, and a tracking servo switch capable of initiating power supply to the tracking servomotor.

REFERENCES:
patent: 4475182 (1984-10-01), Hosaka
patent: 4539667 (1985-09-01), Fujiie
patent: 4544837 (1985-10-01), Tanaka et al.

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