Tracking control system for generating a variable still jump sig

Details Tracking control system for generating a variable still jump sig Tracking control system for generating a variable still jump sig

1995-01-23

1996-11-19

Young, W. R.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 4428, 369 4429, 369 4434, 369 54, G11B 7085

Patent

active

055770096

ABSTRACT:
The present invention relates to a tracking control apparatus wherein an LM driving value for just before a still jump held by a S/H circuit 23 is inputted into the CPU 43 via a low-pass filter 29 and an A/D convertor 30. In this way the magnitude of the still jump signal consisting of a jump pulse and a brake pulse can be set at a value which takes into account disturbances occurring at that time due to the load and suchlike in the flexi-substrate and eccentricities in the track, and the amplitude and/or the pulse width of every pulse can be controlled based on the LM driving value just before the still jump. In the same way, when executing a track seeking operation, by inputting the outputs of the velocity detector 35 and the seeking control circuit 44 into the brake pulse generation circuit 41 via the brake pulse control circuit 42, then the amplitude and/or the pulse width of the brake pulse can be controlled so as take a value which takes into account disturbances occurring at that time due to the load and suchlike in the flexi-substrate and eccentricities in the track, based on the movement velocity of the light spot and LM driving value at that time.

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