PURPOSE: To obtain high-quality clear-cut pictures with desired density by an ink jet method by forming color pictures by using a greater amount of black ink than the other color inks.
CONSTITUTION: Inks of three or more colors of C, M, and Y including black ink, are printed by adhering greater amounts of black ink picture element to a printing medium, that is, 1.1W3.0 times greater than C-ink, 1.1W3.0 times greater than M-ink, and 1.1W3.0 times greater than Y-ink in the density of pictures, by raising the drive voltage of piezo-electric element to spew forth black ink, raising voltage to be applied to a heating element to heat black ink, or lowering the viscosity of black ink. An aimed color picture can thus be recorded on a light transmissive plastic film or light-impervious recording material.
SAKAKI MAMORU
TOGANO SHIGEO
JP58142854B | ||||
JP58179656B | ||||
JPS58158272A | 1983-09-20 | |||
JPS58173669A | 1983-10-12 |