Gradation control device for thermal ink-transfer type printing

Details Gradation control device for thermal ink-transfer type printing Gradation control device for thermal ink-transfer type printing

1986-03-11

1987-03-24

Goldberg, E. A.

Recorders

Thermal recording

400120, G01D 1510, B41J 320

Patent

active

046528920

ABSTRACT:
A gradation control device for a thermal printer, keeps a frequency of a reference clock pulse signal and a data transfer speed to a shift register constant, respectively. A linearity compensation circuit is provided between a data counter and a gate circuit and the gradation level or printing density is controlled by controlling heating times of heating elements within the constant data transfer time, so that a data transfer time for one printing density becomes equal to a maximum heating time of the heating element and a control range described by (maximum printing density)/(minimum printing density) can be set in terms of the period of the reference clock pulse signal to thereby finely control the printing density.

REFERENCES:
patent: 4399749 (1983-08-01), Arai
patent: 4443121 (1984-04-01), Arai
patent: 4532523 (1985-07-01), Tanaka

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