Automatic focusing device in an optical type data reproducing ap

Details Automatic focusing device in an optical type data reproducing ap Automatic focusing device in an optical type data reproducing ap

1982-12-21

1985-12-24

Richardson, Robert L.

Dynamic information storage or retrieval

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

Mechanism control by the control signal

250201, G11B 700, G11B 2102

Patent

active

045610800

ABSTRACT:
An automatic focusing device in an optical type data reproducing apparatus is capable of restoring an objective lens to a position in which a servo controlling system can perform a normal servo control, when the servo controlling system has entered a divergent state. In the device, a photodetector produces a detection signal corresponding to a relative distance between the objective lens and a disk and, in response to this detection signal, the servo controlling system automatically controls the relative distance between the objective lens and the disk so as to form a focal point on a signal plane of the disk. If the objective lens has entered a region in which the servo controlling system has deviated from a converging range and entered divergence, this divergent state is detected in response to the level of an integrated signal of the detection signal from the photodetector and thereupon the objective lens is forcibly moved to a position in which the servo controlling system can perform a normal servo control.

REFERENCES:
patent: 3932700 (1976-01-01), Snopko
patent: 4243848 (1981-01-01), Utsumi

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