Correction circuit for an ink jet device to maintain print quali

Details Correction circuit for an ink jet device to maintain print quali Correction circuit for an ink jet device to maintain print quali

1994-05-20

1996-05-28

Hartary, Joseph W.

Incremental printing of symbolic information

Ink jet

Controller

347 57, B41J 2938

Patent

active

055216200

ABSTRACT:
A method and apparatus for maintaining a print quality of an ink jet apparatus comprises selecting one of a plurality of different pulse signals to apply to at least one heating element. The heating element is energized with the selected pulse signal. An actual voltage drop is then measured across the heating element. The actual voltage drop is subsequently compared with a desired voltage drop. Then, a new pulse signal is selected to energize the heating element based on the results of the comparison. The repetitive process continues until the actual voltage drop is substantially equal to the desired voltage drop. In another embodiment, a bubble sensor is used to determine whether a bubble has been formed over the heating element.

REFERENCES:
patent: 4463359 (1984-07-01), Ayata et al.
patent: 4774530 (1988-09-01), Hawkins
patent: 4872028 (1989-10-01), Lloyd
patent: 5083137 (1992-01-01), Badyal et al.
patent: 5160403 (1992-11-01), Fisher et al.
patent: 5223853 (1993-06-01), Wysocki et al.

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