Liquid ejection head inspection method and printer device

Details Liquid ejection head inspection method and printer device Liquid ejection head inspection method and printer device

2007-09-11

2007-09-11

Huffman, Julian D. (Department: 2853)

Incremental printing of symbolic information

Ink jet

Controller

C347S012000, C347S014000

Reexamination Certificate

active

11067880

ABSTRACT:
The present invention provides inspection of a liquid ejection head which is equipped with plural nozzles at which piezoelectric elements are provided and which ejects recording liquid droplets from the individual nozzles in accordance with application of a driving signal voltage to the individual piezoelectric elements. A first voltage is applied to each individual piezoelectric element for measuring a resonance frequency of the individual piezoelectric element, a second voltage which is higher than the first voltage is applied to the individual piezoelectric element for measuring a resonance frequency of the individual piezoelectric element, and on the basis of the resonance frequencies at the times of application of the first voltage and the resonance frequencies at the times of application of the second voltage, piezoelectric elements that are likely to be susceptible to failure over time are detected.

REFERENCES:
patent: 11-064175 (1999-03-01), None
patent: 2002-127405 (2002-05-01), None
patent: 2004-009501 (2004-01-01), None

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