Thermal head driving device

Details Thermal head driving device Thermal head driving device

1980-07-31

1983-01-25

Rubinson, G. Z.

Recorders

Thermal recording

219216, G01D 1510

Patent

active

043706665

ABSTRACT:
A thermal head driving device is provided with a safety circuit for preventing the heating resistors of a thermal head from being burnt or reduced in life by an abnormal printing pulse signal being applied to the heating resistors. The device is also provided with a temperature correcting circuit for controlling the heating temperature of the heating resistors to prevent the printing density of the thermal head from being varied under the influence of the ambient temperature. The device is further provided with a compensation circuit for varying the printing conditions graded for each range of resistance values of the heating resistors in a plurality of thermal heads to prevent a difference in printing density from being caused by the difference between said resistance values. At least two of the safety circuit, the temperature correcting circuit and the compensation circuit are combined.

REFERENCES:
patent: 3577137 (1971-05-01), Brennan, Jr.
patent: 3777116 (1973-12-01), Brescia et al.
patent: 4113391 (1978-09-01), Minowa

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