Thermographic recorder energizing its heated stylus independentl

Details Thermographic recorder energizing its heated stylus independentl Thermographic recorder energizing its heated stylus independentl

1977-03-30

1978-05-30

Hartary, Joseph W.

Recorders

Thermal recording

219216, 219501, G01D 1510

Patent

active

040926494

ABSTRACT:
The recorder includes a heated stylus which is positioned across a heat-sensitive chart by a servo motor to make the stylus position follow the value of an input signal applied to a servo balancing comparing and driving circuit for the motor. A switching circuit, actuated by the pulse signal output of a pulse generator, interconnects the stylus heater, a capacitor, and a source of capacitor charging energy. The switching circuit alternately charges the capacitor from the source and discharges the capacitor into the stylus heater. This causes the stylus to produce a recorded trace on the chart having an intensity which is substantially independent of the resistance of the stylus heater over a given resistance range.

REFERENCES:
patent: 3699588 (1972-10-01), Eck
patent: 3813677 (1974-05-01), Shimotsuma

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