Ink-jet recording system capable of recording a half-tone

Details Ink-jet recording system capable of recording a half-tone Ink-jet recording system capable of recording a half-tone

1984-08-29

1985-12-24

Hartary, Joseph W.

Facsimile and static presentation processing

Facsimile

Recording apparatus

346140R, 358283, H04N 122, G01D 1518

Patent

active

045610258

ABSTRACT:
An ink jet printer is able to print half-tones with greater fidelity. The printer prints an image in half-tones by creating dots having diameters which vary in correspondence to the density of the half-tone at the corresponding point in an image. The diameter of the dot is controlled by controlling the energy content of a driving pulse which creates the dot (e.g. by varying a driving pulse width). When an image point is too light to be realistically printed by the smallest diameter dot that can be made by the printer, no dot is printed. Instead, the signal representing the unprinted dot is stored and added to the signal of a subsequent image point. This way, the dot at the subsequent point is made a little darker to compensate for the non-printing of the preceding dot.

REFERENCES:
patent: 3828357 (1974-08-01), Koeblitz
patent: 4184168 (1980-01-01), Isayama

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