| 摘要 |
The amount of ink is determined using both a first vibration frequency that is measured when a driving signal of a first frequency is provided to a sensor, and a second vibration frequency that is measured when a driving signal of a second frequency, which is less than the first vibration frequency by a specific ratio, is provided to the sensor. When there is an incorrect measurement of either the first vibration frequency or the second vibration frequency, the natural frequencies to which the vibration frequencies are near will be different. Because the cases wherein the vibration frequency is measured incorrectly are the cases wherein there in no ink, when the first vibration frequency and/or the second vibration frequency is near to the target natural frequency, it is determined that the amount of ink is stored in the cartridge being processed is less than a specific amount.
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