Incremental printing of symbolic information – Ink jet – Controller
Reexamination Certificate
2007-06-19
2007-06-19
Huffman, Julian D. (Department: 2853)
Incremental printing of symbolic information
Ink jet
Controller
C347S023000
Reexamination Certificate
active
10807921
ABSTRACT:
The droplet ejection apparatus of the invention includes a plurality of droplet ejection heads100each having a diaphragm, an actuator that displaces the diaphragm, and a nozzle through which a liquid in a cavity is ejected in the form of droplets in response to the increase and decrease of the internal pressure of the cavity, ejection selecting means182for selecting the nozzle of the ink jet head100in the plurality of ink jet heads100through which a ink droplet is to be ejected, ejection failure detecting means10for detecting a residual vibration of the diaphragm and detecting an ejection failure of the droplets on the basis of a vibration pattern of the detected residual vibration, and switching means23for switching a connection of the actuator from a driving circuit to the ejection failure detecting means10after carrying out a droplet ejection operation by driving the actuator.
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Sakagami Yusuke
Shinkawa Osamu
Huffman Julian D.
Seiko Epson Corporation
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