Browse Prior Art Database

High Speed Droplet Generator

IP.com Disclosure Number: IPCOM000077551D
Original Publication Date: 1972-Aug-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 80K

Publishing Venue

IBM

Related People

Lee, HC: AUTHOR [+3]

Abstract

A piezoelectric crystal 10 is attached to a diaphragm 12 in a cup-shaped housing 14. Cover 16 is provided with an 0-ring seal 18 and has pressurized ink and bleeder port passages 20 and 22, with a nozzle 24 having a recessed nozzle chamber 26 at the inner surface.

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High Speed Droplet Generator

A piezoelectric crystal 10 is attached to a diaphragm 12 in a cup-shaped housing 14. Cover 16 is provided with an 0-ring seal 18 and has pressurized ink and bleeder port passages 20 and 22, with a nozzle 24 having a recessed nozzle chamber 26 at the inner surface.

The displacement available from the piezoelectric crystal is effectively translated into a volumetric change of the nozzle chamber by the diaphragm. The nozzle chamber volume is kept to a minimum to minimize the effect of the compressibility of the ink. A supply channel 30 is designed for high impedance in the operating range, by making its length equal 1/4 wavelength of sound propagating in the ink at the intended operating frequency. The bleed port 22 at the top of the chamber, which is connected to the nozzle chamber by a bleeder channel 32, is provided as the proposed operation depends on all air being purged from the chamber.

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