Tray loading apparatus for disc players

Details Tray loading apparatus for disc players Tray loading apparatus for disc players

1992-01-06

1993-05-11

Shepperd, John

Dynamic information storage or retrieval

Control by timer or external extraneous condition

360 9906, G11B 1704

Patent

active

052107256

ABSTRACT:
A control circuit of a tray loading apparatus determines, according to a disc size and a tray moving direction, a time during which to control the motor at a constant speed. When the specified time has elapsed after the motor was started, the control circuit produces a pulse-width modulated output to slowly lower the motor speed, eliminating impact noise when the tray strikes a stopper. This motor deceleration time is measured. When the measured deceleration time disagrees with a preset or previously detected target deceleration time, the difference is either added to or subtracted from a constant-speed motor operation time and the resultant value is taken as the next target time for constant-speed motor operation. In this way, by changing the time during which the motor is driven at a constant speed, any variations in the tray moving speed as might occur from varying loads on the motor are absorbed to keep the motor deceleration time and decelerating speed unchanged, thus making the tray motion smooth.

REFERENCES:
patent: 4571645 (1986-02-01), Johnson et al.

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