Method and apparatus for regulating print density in an ink-jet

Details Method and apparatus for regulating print density in an ink-jet Method and apparatus for regulating print density in an ink-jet

1994-08-15

1995-12-05

Fuller, Benjamin R.

Incremental printing of symbolic information

Ink jet

Controller

347 16, B41J 29393

Patent

active

054733510

ABSTRACT:
Method and apparatus for regulating print density in a printer of the type of an ink-jet printer having a print cartridge including nozzles which each fire ink therefrom responsive to a voltage pulse applied to a resistor in the nozzle. An optical sensor senses line width printed by the nozzles. Circuitry determines the difference between a predetermined optimum line width and the printed line width. Look-up tables relate the line width to the energy of a pulse applied to each resistor and use this signal to control ink drop volume, and therefore printed dot size. In another embodiment, a nozzle includes 2400 addressable nozzles per inch. Sensed line width is used to vary the dpi by selecting different ones of the nozzles for firing thereby maintaining appropriate relative positioning of the dots when their size varies from the predetermined line width. In the direction of paper movement, the speed of a paper carrier is varied to match the printing frequency of the X-axis to produce square images.

REFERENCES:
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patent: 4435674 (1984-03-01), Hevenor et al.
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patent: 4907013 (1990-03-01), Hubbard et al.
patent: 4967212 (1990-10-01), Manabe et al.
patent: 5289208 (1994-02-01), Haselby
patent: 5319421 (1994-06-01), West
Patent Abstract of Japan Patent No. 3284767 to Akihiko, issued Dec. 1991, filed Mar. 30, 1990.

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