| 摘要 |
To provide an out-of-ink detector which allows the number of electrodes in an ink tank, and the electrode cost, to be reduced and the ink tank to be structurally simplified, an ink tank (50) is provided with only one out-of-ink detection electrode (52), and electrically conductive film (22) formed on a vibration plate (20) is used as another detection electrode. <IMAGE> |
