| 摘要 |
In inkjet printers, it becomes possible to accurately detect changing an ink tank and according to the detection precisely estimate a remaining ink level in detailed scales with a low-cost and simple structure using a sensor. Specifically, a relatively inexpensive sensor that can examine whether the remaining ink level is below a predetermined value or not is employed in combination with a counter (C2) that retains information about ink consumption in printing and other operations. In the case that the sensor has detected an ink level beyond the predetermined value or the presence of ink, when a flag (F0), which indicates as to whether the ink tank is detected to be absence of ink or not, indicates the absence of ink and a flag (F1), which indicates as to whether the ink tank is changed or not, indicates change of the ink tank, the remaining ink level is determined as an amount that fill the ink tank, and when the flag (F0) indicates the absence of ink and the flag (F1) indicates not change of the ink tank, the remaining ink level is determined as an amount corrected by increasing the level.
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