Velocity control device

Details Velocity control device Velocity control device

1992-06-26

1994-07-19

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

318561, 318616, 318366, 318369, 388904, G05B 1101

Patent

active

053312635

ABSTRACT:
A velocity control device is disclosed having feedforward signal applied to a velocity servo loop. An actuator moves a laser beam spot to a desired track of an optical disk. A displacement of the laser beam spot outputted from the actuator is differentiated by a differentiator and converted to a signal corresponding to the velocity of the movement of the laser beam spot. A signal corresponding to a distance from the present position of the laser beam spot to the desired track is obtained from the displacement and a desired count value, and is inputted to a function generator to thus obtain a square root of the distance. The difference between the square root of the distance and the moving velocity is obtained by a substracter, and a feedforward signal is added to the difference. The feedforward signal is obtained by differentiating a velocity profile with respect to time with a differentiator.

REFERENCES:
patent: 4914725 (1990-04-01), Belser et al.
patent: 4922513 (1990-05-01), Joichi

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