Ink-droplet ejecting apparatus

Details Ink-droplet ejecting apparatus Ink-droplet ejecting apparatus

2006-04-26

2009-10-20

Meier, Stephen D (Department: 2853)

Incremental printing of symbolic information

Ink jet

Controller

C347S010000

Reexamination Certificate

active

07604313

ABSTRACT:
There is disclosed an ink-droplet ejecting apparatus including: ink passages each including a pressure chamber filled with ink; actuators each operated to change, upon receiving a drive signal, an inner volume of one of the chambers to generate a pressure wave in the ink in the chamber which propagates along the passage to eject a droplet of the ink onto a recording medium; and a control unit connected to the actuators and supplying the signal to the actuators such that the signal is in one of at least one waveform including a waveform which is for forming a single dot on the medium and includes a main pulse for ejecting the droplet, a preceding pulse outputted before the main pulse, and a stabilizing pulse outputted after the main pulse. A pulse width of the main pulse is not coincident with a one-way propagation time AL which is a time taken by the pressure wave to propagate one way along the passage. The preceding pulse is outputted in a manner not to eject the droplet. The stabilizing pulse is outputted in a manner to pull back a part of the droplet as beginning to be ejected by the main pulse.

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