Ink jet with residual ink detection that compensates for differe

Details Ink jet with residual ink detection that compensates for differe Ink jet with residual ink detection that compensates for differe

1991-08-07

1992-11-10

Hartary, Joseph W.

Recorders

Markers and/or driving means therefor

With ink supply to marker

73304R, B41J 2175

Patent

active

051628171

ABSTRACT:
An ink jet recording apparatus comprises an ink jet head having an ink path communicating with a discharge opening for discharging ink; electrodes arranged in said ink path; a residual ink quantity detection means for detecting residual ink quantity in said ink path in accordance with a resistance value, current value or voltage value from said electrodes; and a correction means for correcting said resistance value, current value or voltage value in accordance with the difference in a resistance of the ink. This enables the correction means to compensate for different ink resistances and thus provide accurate residual ink detection even when different inks are used or ink resistance changes because of a change in ambient conditions.

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patent: 4788861 (1988-12-01), Lichti

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