Optical scanning beam position control system which is free of m

Details Optical scanning beam position control system which is free of m Optical scanning beam position control system which is free of m

1991-07-22

1992-12-22

Hannaher, Constantine

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 4441, 2502015, G11B 700

Patent

active

051735989

ABSTRACT:
Apparatus for scanning tracks in an information plane of a record carrier by means of three beams. The radiation from each one of the three beam spots is push-pull detected by one of three split detection systems (10, 11, 12). A position signal Ep which is a measure of the position of an adjustable element (9) in the apparatus, which element determines the transverse positions of the spots with respect to the track being scanned, is derived from the detector signals. In response to the position signal a control circuit 33 corrects the position of the element (9). A normalizing signal, by which the position signal Ep can be made independent of the intensity of the beams, can also be derived from the detector signals.

REFERENCES:
patent: 4340950 (1982-07-01), Kosaka
patent: 4462095 (1984-07-01), Chen
patent: 4750162 (1988-06-01), Tajima
patent: 4787076 (1988-11-01), Deguchi et al.
patent: 4893298 (1990-01-01), Pasman et al.
patent: 5066138 (1991-11-01), Toide et al.

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