Microprocessor controlled focussing servo acquisition

Details Microprocessor controlled focussing servo acquisition Microprocessor controlled focussing servo acquisition

1983-12-15

1987-07-28

Cardillo, Raymond F.

Dynamic information storage or retrieval

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

Mechanism control by the control signal

369 46, 250201, G11B 7095

Patent

active

046835601

ABSTRACT:
In an auto-focussing system, an actuator which moves together with an objective lens is vertically movable against a rotating optical disc and radiates a light beam so as to form a light spot on an information plane of the disc. A focus servo unit moves the actuator so that an optical distance between the actuator and the disc is within a proper distance region and performs the focus control of the light spot on the disc. While the actuator is approaching the optical disc, an auto-focus/focus servo controller initially makes the servo unit nonoperative and, when the actuator reaches a too-far position in a suitable servo loop distance region specified by a servo loop of the focus servo unit, the controller temporarily stops the movement of the actuator and then moves the actuator again from the too-far position by only a predetermined distance, thereby causing the actuator to be located within the focus loop distance region.

REFERENCES:
patent: 4280215 (1981-07-01), Okano
patent: 4344165 (1982-08-01), Akiyama
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patent: 4439848 (1984-03-01), Ceshkovsky et al.
patent: 4446546 (1984-04-01), Miller
patent: 4475182 (1984-10-01), Hosaka
patent: 4497047 (1985-01-01), Fujiie et al.
patent: 4544837 (1985-10-01), Tanaka et al.
K. P. Kolakowski, Adaptive Gain Tracking of a Sampled Channel IBM TDB vol. 21, No. 10, Mar.1979, p. 4195.
F. C. Gibeau et al., Track Following Pattern and Detection IBM TDB vol. 13, No. 11, Apr. 1971, pp. 3386-3387.

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