Recorders – Markers and/or driving means therefor – With ink supply to marker
Patent
1991-02-26
1993-01-26
Hartary, Joseph W.
Recorders
Markers and/or driving means therefor
With ink supply to marker
B41J 201, B41J 2165
Patent
active
051825805
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 electron-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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Ikeda Kazue
Ujita Toshihiko
Canon Kabushiki Kaisha
Hartary Joseph W.
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