Thermal recording head drive device

Details Thermal recording head drive device Thermal recording head drive device

1983-02-10

1985-01-15

Goldberg, E. A.

Recorders

Thermal recording

358298, 219216, G01D 1510

Patent

active

044941269

ABSTRACT:
A thermal recording head drive device in which a uniform recording density is provided independent of temperature changes in the device. An analog shift register receives an analog input signal having an amplitude which varies according to the densities of picture elements to be recorded. The analog signal is shifted into the register until sufficient data is stored to provide parallel outputs corresponding to an entire line of picture elements to be recorded. Current control circuits are connected in series between respective outputs of the shift register and heat generating resistance elements of the recording head. A common connection terminal of the series circuits of the current control circuits and heat generating resistance elements is connected through a voltage control circuit to a power supply terminal. The internal impedance of the voltage control circuit is set in accordance with at least one detected temperature in or around the recording head which affects the recording density such as the substrate temperature of the head.

REFERENCES:
patent: 4071849 (1978-01-01), Koyano et al.
patent: 4368491 (1983-01-01), Saito
patent: 4391535 (1983-07-01), Palmer
patent: 4401993 (1983-08-01), Morigachi et al.
patent: 4449033 (1984-05-01), McClure et al.

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