Thermal printer using amorphous semiconductor devices

Details Thermal printer using amorphous semiconductor devices Thermal printer using amorphous semiconductor devices

1975-04-25

1976-04-27

Albritton, C. L.

Electric heating

Heating devices

Combined with diverse-type art device

219543, 346 76R, H05B 100

Patent

active

039537080

ABSTRACT:
A thermal printer comprised of a shift register, a line buffer and a plurality of printheads in heat-transfer relationship with a heat-sensitive record medium. The shift register and line buffer are comprised of a plurality of stages or modules with each module having an amorphous semiconductor heating element that exhibits current controlled negative differential resistance in heat-transfer proximity to a heat-gated amorphous semiconductor threshold switch which has a V-I characteristic which is strongly temperature dependent. The printheads are comprised of the amorphous semiconductor heating elements. Data is stored in the shift register by means of a video data signal and two oppositely phased clock signals of an amplitude that will only bias a heated threshold switch to conduction, with transfer of data to the line buffer being achieved in a parallel format by a third properly phased clock signal. The data in the line buffer is transferred in parallel to the printheads which generate heat uniformly when in their low resistance state to thereby provide marking of the heat-sensitive record medium.

REFERENCES:
patent: 3743779 (1973-07-01), Hutner
patent: 3745304 (1973-07-01), Hutner
patent: 3813513 (1974-05-01), Vora et al.

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