Universal fluid droplet ejector

Details Universal fluid droplet ejector Universal fluid droplet ejector

1997-10-27

1999-08-24

Tran, Huan

Incremental printing of symbolic information

Ink jet

Ejector mechanism

2391022, B41J 2045

Patent

active

059430753

ABSTRACT:
A droplet generator comprises a fluid reservoir having a side wall made of glass or quartz, and an end cap made from a silicon plate. The end cap contains a micromachined aperture through which the fluid is ejected. The side wall is thermally fused to the end cap, and no adhesive is necessary. This means that the fluid only comes into contact with the side wall and the end cap, both of which are chemically inert. Amplitudes of drive pulses received by reservoir determine the horizontal displacements of droplets relative to the ejection aperture. The drive pulses are varied such that the dropper generates a two-dimensional array of vertically-falling droplets. Vertical and horizontal interdroplet spacings may be varied in real time. Applications include droplet analysis experiments such as Millikan fractional charge searches and aerosol characterization, as well as material deposition applications.

REFERENCES:
patent: 3683212 (1972-08-01), Zoltan
patent: 5124716 (1992-06-01), Roy et al.
patent: 5619234 (1997-04-01), Nagato et al.
Savage, M. et al., A search for fractional charges in native mercury, Phys. Lett., vol. 167B, No. 4, 1986.
Joyce, D., M. S. Thesis, San Francisco State University, 1985.

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