Cavitational liquid impact printer

Details Cavitational liquid impact printer Cavitational liquid impact printer

1985-02-19

1986-04-01

Hartary, Joseph W.

Recorders

Markers and/or driving means therefor

With ink supply to marker

G01D 1518

Patent

active

045801495

ABSTRACT:
An ink jet printhead for use in a thermal ink jet printer having bubble-generating heating elements formed symmetrically around the entrances to passageways in the ink-holding printhead chamber that terminate as nozzles. The heating elements are individually addressable with current pulses to form vapor bubbles, which, during collapse, produce an impact force that expels and propels droplets toward a recording medium. An alternate embodiment includes an ultrasonic generator in the printhead chamber to produce pressure waves in the ink contained in the chamber. The current pulse applied to the heating element is synchronized with the lower pressure wave to obtain bubble growth with substantially lower temperatures resulting in a more energy efficient printhead.

REFERENCES:
patent: 4251824 (1981-02-01), Hara et al.
patent: 4275290 (1981-06-01), Cielo et al.
patent: 4376945 (1983-03-01), Hara et al.
patent: 4409596 (1983-10-01), Ishii
patent: 4410899 (1983-10-01), Haruta et al.
patent: 4463359 (1984-07-01), Ayata et al.
patent: 4532530 (1985-07-01), Hawkins
IBM Tech Discl. Bulletin, vol. 18, No. 4, Sep. 1975, by D. E. Fisher and J. L. Mitchell, entitled "Ultrasonic Cavity Resonance for Ink-on-Demand Pats. Ink Formation".

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