Method of abnormal state detection for ink jet recording apparatus
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United States of America Patent
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-
Jun 7, 1994
Issued Date -
N/A
app pub date -
Oct 7, 1992
filing date -
Feb 26, 1990
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An ink jet recording apparatus records information by ejecting ink droplets onto a recording medium. The ink jet recording apparatus has a recording head; driving circuits, measuring circuit, and a judging unit. The recording head has ejection outlets and ink liquid passages connecting to the ejection outlets respectively, an electro-thermal converting element being disposed in each of the ink liquid passages, for generating thermal energy for ejecting the ink droplets. The driving circuits drive the electro-thermal converting element to generate the thermal energy enough to eject the ink droplet. The measuring circuit individually measures a resistance value of the electro-thermal converting element when the driving circuits drive the electro-thermal converting element. The judging unit judges presence of an abnormal state in the ink liquid passage according to the resistance value.
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