Recorders – Thermal recording
Patent
1991-04-23
1992-11-03
Reinhart, Mark J.
Recorders
Thermal recording
B41J 232
Patent
active
051609410
ABSTRACT:
A method of driving a thermal head enabling recording of multiple gradations and having a plurality of heating resistors, comprising: a first step of calculating an amount of density correction, corresponding to an amount of decrease of printed density of the specific ones of the heating resistors due to reduction of quantity of heat generated by the specific ones of the heating resistors, which reduction is caused by simultaneous heating of the specific ones of the heating resistors and the remaining heating resistors; and a second step of applying to the specific ones of the heating resistors, a print signal corrected on the basis of the amount of density correction so as to drive the specific ones of the heating resistors such that a desired printed density is obtained; in which in the first step, the amount of density correction is calculated on the basis of a weight factor, an imaginary number of the heating resistors and a maximum amount of density decrease.
REFERENCES:
patent: 4774528 (1988-09-01), Kato
patent: 4804976 (1989-02-01), Ohmori et al.
Sublimation Dye Transfer Process (pp. 70-71) Japanese document already submitted.
Fujiwara Yoshihisa
Genno Hirokazu
Reinhart Mark J.
Sanyo Electric Co,. Ltd.
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