(57) A device for detecting a quantity of remaining ink includes first and second electrodes
(1, 2) provided in an ink supply passage (6) which connects an ink tank (8) for storing
an ink to a recording head (9) for emitting the ink, and a detection means for detecting
a resistance between the first and second electrodes (1, 2). The second electrode
(2) is provided in the ink supply passage (6) in an area relatively close to the recording
head (9), whereas the first electrode (1) is provided in the ink supply passage in
an area relatively far from the recording head with the second electrode therebetween.
The second electrode is maintained at the same potential as that of a substrate which
constitutes the recording head and on which emission energy generating elements driven
to emit the ink are disposed, whereas the first electrode is maintained at a potential
different from that of the second electrode. IN consequence, the amount of remaining
ink can be detected by measuring changes in the resistance between the first and second
electrodes (1, 2).
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