Printer for generating images with high contrast gray and color

Details Printer for generating images with high contrast gray and color Printer for generating images with high contrast gray and color

1989-03-03

1990-08-28

Burr, Edgar S.

Typewriting machines

Typing by other than type-face or type-die

Thermal

400121, 346 76PH, B41J 2385

Patent

active

049520857

ABSTRACT:
The invention relates to a printer, preferably a thermal printer, equipped with a line-width printing head including a plurality of closely spaced printing elements. To permit high contrast gray tone gradation in a dot matrix image, the invention provides that the printing elements having odd and even ordinal numbers are combined into respective energization groups. The two groups can be energized alternatingly at the spacing of one matrix line. Thus, the distance between adjacent image dots is twice as large as the distance between the printing elements. The printing elements can be energized by different amounts of energy in four successive time periods during the advancement of the sheet of paper by one matrix line. By way of the selection of individual periods and their combination, the heating elements can be excited at thirteen different energy levels. In this way, image dots can be produced from the size of a barely visible dot to twice the area of a printing element.

REFERENCES:
patent: 4268179 (1981-05-01), Long et al.
patent: 4536771 (1985-08-01), Tanaka
patent: 4547784 (1985-10-01), Erlichman
patent: 4768042 (1988-08-01), Zama
patent: 4777536 (1988-10-01), Kato
patent: 4809021 (1989-02-01), Check
Erhard D. Stiebner v.a., Drucktechnik heute, 1985, Verl. F. Bruckman KG., Munchen.

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