Optical disc apparatus with accessing using only reference veloc

Details Optical disc apparatus with accessing using only reference veloc Optical disc apparatus with accessing using only reference veloc

1994-02-25

1996-03-05

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4434, 369 54, G11B 7085

Patent

active

054973600

ABSTRACT:
With this invention, the reference velocity data corresponding to the number of the remaining tracks to the destination target position of the optical head is stored, and on the basis of the reference velocity data, the velocity of the optical head is controlled. The reference velocity data contains the maximum velocity region data and deceleration data for the optical head. The deceleration data is obtained by subtracting the steady-state deviation from the velocity trajectory. The steady-state velocity deviation is obtained from the response characteristic of the optical-head velocity control system. When the optical head is moved, the reference velocity data corresponding to the number of the remaining tracks between the current position of the optical head and the destination target position is read. On the basis of this read-out reference velocity data, a linear motor for driving the optical head is controlled.

REFERENCES:
patent: 4591933 (1986-05-01), Quackenbush
patent: 4622604 (1986-11-01), Hashimoto et al.
patent: 5301174 (1994-04-01), Matoba et al.
patent: 5305161 (1994-04-01), Giovanetti et al.
"Disturbance tolerable servo systems for optical disk drive" Information, Intelligence, and Precision Equipment Division of the Machine Society of Japan (No. 920-67) IIP '92 Tokyo, Oct. 20-21, 1992, pp. 101-102.

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