Drop-on-demand ink-jet printing apparatus

Details Drop-on-demand ink-jet printing apparatus Drop-on-demand ink-jet printing apparatus

1986-09-04

1987-08-18

Hartary, Joseph W.

Recorders

Performance of multiple functions of steam and gas engines

Pressure responsive element

346140R, G01D 1518

Patent

active

046880488

ABSTRACT:
A drop-on-demand ink-jet printing head has an ink chamber filled with ink from an ink supply reservoir. The ink chamber has a deflectable upper elastic surface, a deflection of which increases ink fluid pressure. A deflection of said surface exciting a plurality of resonant pressure vibration modes within the chamber. A pressure increase within the chamber causing an ink droplet to be projected out a nozzle at one end of the chamber. A piezoelectric transducer is fixed on the elastic surface to deflect it and excite resonant vibration with a plurality of nodes and loops or antinodes. The transducer is positioned on the elastic surface at one of the loops or antinodes of a preselected one of the pressure vibration modes to excite the pressure modes with a short time constant (high frequency) which enables a very fine droplet of small volume to be projected. This can be done without reducing the cross sectional area of the nozzle or the velocity of the droplet.

REFERENCES:
patent: 4189734 (1980-02-01), Kyser et al.
patent: 4525728 (1985-06-01), Koto
patent: 4549191 (1985-10-01), Fukuchi
Kyser et al; Design of an Impulse Ink Jet, Jr. App. Photo Engr., vol. 7, No. 3, Jun. 1981, pp. 73-79.
Beasley, J. D.; Model for Fluid Ejection and Refill in an Impulse Drive Jet, Photogr. Sci. Eng., 21:78-82 (1977).

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