Air assisted ink jet head with projecting internal ink drop-form

Details Air assisted ink jet head with projecting internal ink drop-form Air assisted ink jet head with projecting internal ink drop-form

1985-04-08

1986-09-23

Hartary, Joseph W.

Recorders

Markers and/or driving means therefor

With ink supply to marker

G01D 1518

Patent

active

046138757

ABSTRACT:
An air assisted drop-on-demand ink jet head 10 has an ink chamber with an ink drop-forming orifice outlet 23 from which ink drops are generated in response to pressure waves caused by a piezoelectric crystal 56. The ink drops are carried by air outwardly through an external orifice 24 and toward printing medium. The internal orifice outlet 23 is centered in a projecting structure 48 which extends toward the external orifice 24. In one form, the projection 48 is of a frustoconical or mesa-like shape. Air flowing past the top of the projection prevents ink from wetting anything but the top of the projection, resulting in highly uniform ink drop formation with a single uniform dot being produced on the printing medium in response to each pressure wave.

REFERENCES:
patent: 3747120 (1973-07-01), Stemme
patent: 3805273 (1974-04-01), Brady
patent: 4002230 (1977-01-01), Schweppe
patent: 4106032 (1978-08-01), Miura
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patent: 4380018 (1983-04-01), Andoh
patent: 4413268 (1983-11-01), Bentin
patent: 4422082 (1983-12-01), Louzil
patent: 4549188 (1985-04-01), Shackleton
patent: 4555717 (1985-11-01), Miura
Doering et al; Droplet Emission with Micro-Planar Ink Drop Generators; SID Symposium Digest, 1984, pp. 364-367.
Doring, M; Ink-Jet Printing, Philips Technical Review, 40, No. 7, 1982, pp. 192-198.
Dollenmayer, W. L.; Ink Jet Nozzle Design, IBM Tech. Disc. Bulletin, vol. 22, No. 6, Nov. 1979, pp. 2333-2334.

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