Method and apparatus to check piezoelectric inkjet head

Details Method and apparatus to check piezoelectric inkjet head Method and apparatus to check piezoelectric inkjet head

2011-01-11

2011-01-11

Huffman, Julian D (Department: 2853)

Incremental printing of symbolic information

Ink jet

Controller

Reexamination Certificate

active

07866781

ABSTRACT:
A method and apparatus to check an operation of a piezoelectric inkjet head includes a first current detection unit to detect a first current output from a piezoelectric element of the piezoelectric inkjet head when a predetermined voltage is applied, a second current detection unit to detect a second current from a capacitor having a capacitance with the same magnitude as a capacitor component of the piezoelectric element when the voltage is applied to the capacitor, and a third current detection unit to detect a third current corresponding to a difference between the first current and the second current, as the amount of deformation of the piezoelectric element according to the application of the voltage.

REFERENCES:
patent: 4498088 (1985-02-01), Kanayama
patent: 6469418 (2002-10-01), Katerberg et al.
patent: 2006/0038858 (2006-02-01), Ishizaki

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