System for printing images having a half tone

Details System for printing images having a half tone System for printing images having a half tone

1976-04-19

1978-01-31

Hartary, Joseph W.

Recorders

Performance of multiple functions of steam and gas engines

Pressure responsive element

346 76R, 358298, G01D 1510

Patent

active

040718492

ABSTRACT:
Printed images having a half tone are realized in a printing system using a temperature sensitive paper. A thermal-head which is positioned close to the temperature sensitive paper is heated by an input electrical signal and the heated thermal-head changes the darkness of the temperature sensitive paper. The period of time that the thermal-head is heated is controlled by the input electrical signal and, thus, the temperature of the thermal-head is a function of the input electrical signal. The darkness or the concentration of images on the temperature sensitive paper can be changed according to the input electrical signal. Thus an image having a half tone is obtained on a temperature sensitive paper.

REFERENCES:
patent: 3987492 (1976-10-01), Kraus et al.

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