Printer

Details Printer Printer

1993-08-03

1997-03-25

Tran, Huan H.

Incremental printing of symbolic information

Thermal marking apparatus or processes

Density control

358461, B41J 236, B41J 2365

Patent

active

056149344

ABSTRACT:
A color correction circuit is best adjusted to consistently obtain a stable, color printing by compensating for a change in the characteristic of a printer under the influence of ambient temperature and humidity.
Before the printing of pictorial data, e.g., an image, (reference data produced by a reference data generator), is entered into a printer engine by which it is printed out on a sheet of a paper. This printed data is read in by a color sensor, which in turn produces an output detection signal. A feedback control circuit produces a control signal necessary for a color correction according to the output signal of the color sensor and then sends it to the color correction circuit. The color correction circuit is adjusted and corrects the colors of the pictorial data to be printed. The corrected data is printed out. Repeating this process for each color printing can prevent a variation in the printed colors due to the effect of ambient temperature.

REFERENCES:
patent: 4786917 (1988-11-01), Hauschild
patent: 4839722 (1989-06-01), Barry et al.
patent: 5291220 (1994-03-01), Klees
Tajima Johji, "Color Reproduction Processing for Digital Pagination System", (Journal of Japan Electro-communication Society, 85/4 vol. J68-D No. 4, pp. 710-717).
"Image processing devices for use in the field of printing and printing-plate making", pp. 124-127, May 19, 1991.

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