Method for ejecting ink droplets from a nozzle in a fill-before-

Details Method for ejecting ink droplets from a nozzle in a fill-before- Method for ejecting ink droplets from a nozzle in a fill-before-

1996-07-18

1999-05-11

Hartary, Joseph

Incremental printing of symbolic information

Ink jet

Controller

347 68, B41J2/045

Patent

active

059032863

ABSTRACT:
A driving method for driving an ink ejection device operated in shear mode. In order that the ink ejection speed does not vary depending on the driving frequency, a first pulse signal and a second pulse signal are sequentially applied to the electrode of an ink channel. The first pulse signal is for ejecting an ink droplet from the corresponding nozzle of the ink channel, and the second pulse signal is for canceling pressure fluctuations remaining in the ink after ejection of ink. The second pulse signal has a voltage level equal to that of the first pulse signal. At the rising edge of the first pulse signal, the volume of the ink channel is increased from a natural volume to an increased volume. As a result, a pressure wave is generated in the ink filling the ink channel. At the falling edge of the first pulse signal, the volume of the ink chamber reverts to the natural volume, thereby ejecting an ink droplet from the nozzle. Thereafter, the second signal is applied to cancel out the residual pressure fluctuations. In the present invention, the sequential timings of the first and second pulse signals including the durations of the first and second pulse signals are specifically defined based on evaluation of experimental results.

REFERENCES:
patent: 3946398 (1976-03-01), Kyser et al.
patent: 4723129 (1988-02-01), Endo et al.
patent: 4743924 (1988-05-01), Scardovi
patent: 4879568 (1989-11-01), Bartky et al.
patent: 4972211 (1990-11-01), Aoki

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