Ink-jet apparatus having a preliminary pulse signal and a jet pu

Details Ink-jet apparatus having a preliminary pulse signal and a jet pu Ink-jet apparatus having a preliminary pulse signal and a jet pu

1996-06-18

1999-03-09

Fuller, Benjamin R.

Incremental printing of symbolic information

Ink jet

Controller

347 11, B41J 2938

Patent

active

058807500

ABSTRACT:
A drive waveform consists of a jet pulse signal A for ejecting ink and a preliminary pulse signal B for causing preliminary variations in a pressure within an ink flow passage before the ink is ejected. The jet pulse signal A and the preliminary pulse signal B have the same peak value (a voltage) E(V). The width WA of the jet pulse signal A is identical with time T during which a pressure wave uni-directionally travels along the inside of the ink flow passage, and the width WB of the preliminary pulse signal B is twice the uni-directional propagation time T within the ink flow passage. A delay time TD between time TE at which the preliminary pulse signal B falls and time TS at which the jet pulse signal A rises, is half the time T during which the pressure wave uni-directionally travels along the inside of the ink flow passage. The invention makes it possible to implement an inexpensive ink-jet apparatus and a driving method thereof which provide a required volume of ink droplet and superior print quality.

REFERENCES:
patent: 3946398 (1976-03-01), Kyser et al.
patent: 4266232 (1981-05-01), Juliana, Jr. et al.
patent: 4369455 (1983-01-01), McConica et al.
patent: 4879568 (1989-11-01), Bartky et al.
patent: 4982199 (1991-01-01), Dunn
patent: 5764256 (1998-01-01), Zhang

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