Curve follower

Details Curve follower Curve follower

1975-03-26

1976-11-30

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

318577, G05B 100

Patent

active

039951545

ABSTRACT:
A curve tracer comprising: an optical tracer head for scanning a line having at least a substantial transverse component and at least one marking on the line, with a predetermined scanning speed. The head is moved along the line at a speed substantially lower than the scanning speed. There is a control unit for controlling the movement including an integrator, means for feeding the integrator with a voltage proportional to the speed of the tracer head, and means for supplying a signal proportional to the distance travelled by the tracer head when the head moves over the marking.

REFERENCES:
patent: 3496437 (1970-02-01), Layden
patent: 3597619 (1971-08-01), Little et al.
patent: 3790788 (1974-02-01), Lister
patent: 3868555 (1975-02-01), Knowles

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