LIQUID DETECTION DEVICE, LIQUID EJECTING APPARATUS, AND METHOD OF DETECTING LIQUID
First Claim
1. A liquid detection device that drives a liquid detecting portion, comprising:
- a driving portion that supplies a driving signal or a preliminary charging voltage to the liquid detecting portion;
a signal detecting portion that receives a detection signal from the liquid detecting portion;
a high-pass filter portion that has a capacitor portion and that is arranged between the liquid detecting portion and the signal detecting portion;
a first switch that is arranged between the liquid detecting portion and the high-pass filter portion, and that electrically connects or interrupts a line between the liquid detecting portion and the high-pass filter portion; and
a control portion that controls the driving portion and the first switch to execute detection of liquid.
1 Assignment
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Accused Products
Abstract
A liquid detection device that drives a liquid detecting portion includes a driving portion, a signal detecting portion, a high-pass filter portion, a first switch, and a control portion. The driving portion supplies a driving signal or a preliminary charging voltage to the liquid detecting portion. The signal detecting portion receives a detection signal from the liquid detecting portion. The high-pass filter portion has a capacitor portion and is arranged between the liquid detecting portion and the signal detecting portion. The first switch is arranged between the liquid detecting portion and the high-pass filter portion, and electrically connects or interrupts a line between the liquid detecting portion and the high-pass filter portion. The control portion controls the driving portion and the first switch to execute detection of liquid.
47 Citations
13 Claims
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1. A liquid detection device that drives a liquid detecting portion, comprising:
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a driving portion that supplies a driving signal or a preliminary charging voltage to the liquid detecting portion; a signal detecting portion that receives a detection signal from the liquid detecting portion; a high-pass filter portion that has a capacitor portion and that is arranged between the liquid detecting portion and the signal detecting portion; a first switch that is arranged between the liquid detecting portion and the high-pass filter portion, and that electrically connects or interrupts a line between the liquid detecting portion and the high-pass filter portion; and a control portion that controls the driving portion and the first switch to execute detection of liquid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of detecting liquid in a liquid detection device, comprising:
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electrically connecting a line between a liquid detecting portion and a high-pass filter portion; applying a preliminary charging voltage to the liquid detecting portion; electrically interrupting a line between the liquid detecting portion and the high-pass filter portion; applying a driving signal to the liquid detecting portion; electrically connecting a line between the liquid detecting portion and the high-pass filter portion; and detecting the presence or absence of the liquid using a detection signal output from the liquid detecting portion through the high-pass filter portion.
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Specification