Inkjet recording apparatus
AssigneeFuji Xerox Co., Ltd.
InventorSunao Ishizaki
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Abstract
An ink non-ejection detecting circuit device for an inkjet recording apparatus is disclosed which comprises a bridge circuit including a piezoelectric head having a piezoelectric element, a first resistor connected in series to the piezoelectric head, a capacitor provided outside the piezoelectric head, and a second resistor connected in series to the capacitor. A differential voltage that appears between the piezoelectric head and the first resistor and between the capacitor and the second resistor is amplified, so that the acoustic-system admittance of the piezoelectric head can be detected with a high SN ratio.
Claims21
An ink non-ejection detecting circuit for an inkjet recording apparatus, comprising:
- a bridge circuit including a piezoelectric head having a piezoelectric element, a first resistor connected in series with the piezoelectric head, a capacitor provided outside the piezoelectric head, and a second resistor connected in series with the capacitor;
- and
- a differential amplifier circuit that amplifies a differential voltage appearing between the piezoelectric head and the first resistor and between the capacitor and the second resistor, the differential voltage being proportional to an admittance of an acoustic vibration system of the piezoelectric head.
A method for checking an inkjet recording apparatus wherein ink is ejected by a piezoelectric head having a piezoelectric element, comprising:
- forming a bridge circuit including the piezoelectric head, a first resistor connected in series with the piezoelectric head, a capacitor provided outside the piezoelectric head, and a second resistor connected in series with the capacitor;
- and
- amplifying a differential voltage that appears between the piezoelectric head and the first resistor and between the capacitor and the second resistor, the differential voltage being proportional to an admittance of an acoustic vibration system of the piezoelectric head.
Dependencies are inferred from the claim text.