Thermal ink jet printer with droplet ejection by bubble collapse

Details Thermal ink jet printer with droplet ejection by bubble collapse Thermal ink jet printer with droplet ejection by bubble collapse

1985-02-19

1986-04-01

Hartary, Joseph W.

Recorders

Markers and/or driving means therefor

With ink supply to marker

G01D 1516

Patent

active

045801487

ABSTRACT:
A thermal ink jet printhead ejects ink droplets on demand by utilizing the conservation of momentum of collapsing bubbles in a layer of liquid ink having a predetermined thickness. The printhead has an ink containing chamber with an array of individually addressable heating elements on one chamber interior surface which are aligned with an elongated opening in a parallel, confronting chamber wall. The spacing between the chamber wall with the elongated opening and the chamber surface with the heating elements provide the desired ink layer thickness. Selectively addressed heating elements momentarily produce vapor bubbles in the ink layer. When the bubbles collapse radially inward towards their respective heating elements, an oppositely directed force perpendicular to the heating element is generated which is large enough to overcome the surface tension of the ink in the elongated opening and propel a droplet of ink therefrom towards a recording medium.

REFERENCES:
patent: 4251824 (1981-02-01), Hara et al.
patent: 4336548 (1982-06-01), Matsumoto
patent: 4339762 (1982-07-01), Shirato et al.
patent: 4410899 (1983-10-01), Haruta et al.
patent: 4463359 (1984-07-01), Ayata et al.
patent: 4532530 (1985-07-01), Hawkins
IBM Tech. Disc. Bulletin, vol. 78, No. 4, Sep. 1975, to D. E. Fisher et al., "Ultrasonic Cavity Resonance for Ink-On-Demand Ink Jet Formation".
IEEE, in 1983 by S. Ichinose et al., "Solid-State Scanning Ink Jet Recording" Article.
IEEE Article by T. Agui et al. in IEEE Transactions on Electronic Devices, vol. ED-24, No. 3, Mar. 1977, "Drop Formation Characteristics of Electrostatic Ink Jet Using Water-Based Ink".

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