Ink-jet recording head having bump-shaped electrode and protecti

Details Ink-jet recording head having bump-shaped electrode and protecti Ink-jet recording head having bump-shaped electrode and protecti

1992-02-07

1993-09-07

Hartary, Joseph W.

Recorders

Markers and/or driving means therefor

With ink supply to marker

361785, 439 67, G01D 1516

Patent

active

052433633

ABSTRACT:
A recording element unit includes a support member, a recording element provided on the support member and having a wiring layer for supplying electrical signals, and a bump-shaped electrode connected to the wiring layer so as to be raised therefrom. The bump-shaped electrode includes a plurality of raised portions. Such a bump-shaped electrode is also included in a recording element driving unit, an ink jet unit, and an ink jet driving unit. This arrangement solves the problem of the low reliability of the electrical connection between a recording element substrate, on which the electrode is positioned, and a driving element substrate, for driving the recording element. The unit also includes first and second protective layers with the second protective layer having a thickness greater than that of the first. This feature provides structural strength to the support member in order to prevent warping.

REFERENCES:
patent: 4420203 (1983-12-01), Aug
patent: 4719477 (1988-01-01), Hess
patent: 4813129 (1989-03-01), Karnezos
patent: 4862197 (1989-08-01), Stoffel
"An Inexpensive, Portable Ink-Jet Printer Family", C. Katen, et al., Hewlett-Packard Journal,, May 1985, vol. 36, No. 5, p. 14.

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