Smooth lock-in of servo control when switched on

Details Smooth lock-in of servo control when switched on Smooth lock-in of servo control when switched on

1985-09-10

1987-07-28

Richardson, Robert L.

Dynamic information storage or retrieval

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

Mechanism control by the control signal

369 46, G11B 700

Patent

active

046835610

ABSTRACT:
An apparatus for playing optical discs is described, in which for a smoother locking-in of the focus servo control the focussing error signal is initially derived from the amplitude of the h.f. signal, followed by a gradual change-over to a difference signal derived by means of subdetectors. In this way the focus control point with the servo loop closed is shifted towards the desired in-focus point.

REFERENCES:
patent: 4280215 (1981-07-01), Okano
patent: 4607157 (1986-08-01), Millar et al.

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