Tone control for thermal ink-transfer printing apparatus

Details Tone control for thermal ink-transfer printing apparatus Tone control for thermal ink-transfer printing apparatus

1983-03-10

1985-07-30

Goldberg, E. A.

Recorders

Thermal recording

358298, 219216, G01D 1516

Patent

active

045325235

ABSTRACT:
A tone control device in a thermal ink-transfer type printing apparatus comprising a thermal printing head having a plurality of head elements, where each of the plurality of head elements respectively comprise heating resistors for heating a transfer sheet adhered with a kind of ink which melts due to heat and transferring melted ink onto a recording sheet which makes contact with the transfer sheet to print images such as characters and figures, comprises a converting circuit for sampling an input analog signal indicating tone of density of an image to be printed on the recording sheet according to the number of the head elements, and converting the input analog signal into a digital signal, a memory for storing and reading out the output converted digital signal of the converting circuit, and a control circuit for controlling a duration with which a current having a predetermined value is applied to the head elements, with respect to each of the head elements, according to data of the digital signal read out from the memory.

REFERENCES:
patent: 4284876 (1981-08-01), Ishibashi et al.
patent: 4368491 (1983-01-01), Saito
patent: 4374385 (1983-02-01), Yoshizaki et al.
IBM Technical Disclosure Bulletin, vol. 24, No. 1B, Jun. 1981, New York, NY, E. A. Cunningham, "Thermal Printhead Drive Circuit for High Speed Printing", pp. 646-648.

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