Liquid droplet ejection method, liquid droplet ejection...

Details Liquid droplet ejection method, liquid droplet ejection... Liquid droplet ejection method, liquid droplet ejection...

2007-07-24

2007-07-24

Huffman, Julian D. (Department: 2853)

Incremental printing of symbolic information

Ink jet

Controller

C347S023000

Reexamination Certificate

active

10978536

ABSTRACT:
To provide a liquid droplet ejection method which can detect abnormality of a nozzle, an ejection head including a plurality of nozzles has, for the respective nozzles, a camera unit that images from the inside of a nozzle to its peripheral portion. A captured image processing unit converts the captured image into an image which can recognize at least one of a state of a meniscus inside the nozzle, the shape of a nozzle opening and states of surface films formed inside and outside the nozzle, and sends the converted image to a comparison determination unit. The comparison determination unit compares the converted image with a reference image which is previously stored in a determination condition storing unit. As a result, for an objective nozzle, the quality (nozzle abnormality) of ejection performance is determined.

REFERENCES:
patent: 2002/0080375 (2002-06-01), Waldner et al.
patent: A-10-044399 (1998-02-01), None
patent: 10-268127 (1998-10-01), None

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