Line-trace read-out method and device for the servo-control of m

Details Line-trace read-out method and device for the servo-control of m Line-trace read-out method and device for the servo-control of m

1978-07-21

1980-06-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

318577, G05B 100

Patent

active

042074622

ABSTRACT:
The line-trace to be read-out is illuminated by a light spot scanning radially from, and by rotation around, a center that it set near the line-trace to be read, the radial scan having its own scan frequency and the scan turning around the center at a specific frequency of rotation. A signal is formed corresponding to the contrast modulation between the line-trace and the surrounding background, which is processed to give a signal corresponding to the minimum distance between the scan sweep center and the line-trace, the latter signal being processed further to produce the co-ordinates needed for directing the servo-control means of a machine tool.

REFERENCES:
patent: 3398283 (1968-08-01), Diprose

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