Droplet discharging device and method of detecting discharge...

Details Droplet discharging device and method of detecting discharge... Droplet discharging device and method of detecting discharge...

2005-03-24

2008-09-30

Do, An H. (Department: 2853)

Incremental printing of symbolic information

Ink jet

Controller

C347S020000

Reexamination Certificate

active

07429093

ABSTRACT:
A droplet discharging device is provided which does not require a special sensor (an optical sensor) and can enhance the precision of detecting a discharge abnormality of ink droplets. When printing is to be carried out, a transistor having a large current capacitance is turned on, a driving signal is applied from a driving circuit to piezoelectric actuators, and ink droplets are discharged by corresponding nozzles. Upon detecting a discharge abnormality of the nozzles, one of the piezoelectric actuators corresponding to the nozzles is selected, the transistor is turned off and a switch is turned on. A driving voltage is then applied from the driving circuit to the piezoelectric actuator thus selected in this state. When the application of the driving voltage ends, the switch is turned off. Consequently, a residual vibration detecting circuit detects the electromotive voltage of the piezoelectric actuator by the residual vibration of a vibrating plate.

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