Voltage compensating drive circuit for a thermal printer

Details Voltage compensating drive circuit for a thermal printer Voltage compensating drive circuit for a thermal printer

1977-10-25

1979-09-18

Albritton, C. L.

Electric heating

Heating devices

Combined with diverse-type art device

219543, 346 76R, H05B 100

Patent

active

041684214

ABSTRACT:
A voltage compensating drive circuit for a thermal printer is provided. The thermal printer includes a power supply for producing a supply voltage of varying magnitude. A plurality of exothermic printing elements are disposed on a substrate for recording print characters on a thermally sensitive medium in response to a current driving pulse being applied thereto. The printing density of the print characters, recorded on the thermally sensitive medium, are varied in response to variations in the duration of the current drive pulse applied to the exothermic printing element. The voltage compensating drive circuit is coupled to the power supply in order to detect changes in the magnitude of the supply voltage and includes an oscillator circuit for controlling the duration of the current driving pulses in response to changes in the magnitude of the supply voltage to thereby stabilize the printing density of each print character recorded on a thermally sensitive medium.

REFERENCES:
patent: 3467810 (1969-09-01), Cady, Jr.
patent: 3913091 (1975-10-01), Aizawa et al.
patent: 3934695 (1976-01-01), Kovalick

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