Device for controlling the density of printing characters

Details Device for controlling the density of printing characters Device for controlling the density of printing characters

1975-02-10

1976-08-17

Hartary, Joseph W.

Recorders

Thermal recording

219216, G01D 1510

Patent

active

039757072

ABSTRACT:
To adjust the density of alphanumeric to be thermally printed by a thermal printer, a time duration for applying the row or column drive current to the selected dot elements in a thermal head is varied so as to vary a time duration for which the selected dot elements are energized, to thereby change the quantity of heat dissipated therefrom depending upon the environmental temperature, the thermal characteristics and aging of thermally sensitive paper and so forth. The drive current flowing duration may be varied by varying a cycle of the drive current signals to be sequentially applied to the row or column drive lines of a dot element matrix circuit through a character generator. In one embodiment of the present invention, the cycle of the drive current signals may be varied by the frequency division or count down of the clock pulses with a variable pulse repetitive rate used in an electronic computer.

REFERENCES:
patent: 2922688 (1960-01-01), Boyan
patent: 3139026 (1964-06-01), Meckstroth et al.
patent: 3577137 (1971-05-01), Brennan

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