Liquid jet recording head having tapered liquid passages

Details Liquid jet recording head having tapered liquid passages Liquid jet recording head having tapered liquid passages

1991-01-17

1992-10-27

Hartary, Joseph W.

Recorders

Markers and/or driving means therefor

With ink supply to marker

B41J 205

Patent

active

051593548

ABSTRACT:
A liquid jet recording head includes a plurality of ejection outlets through which droplets of liquid are ejected by thermal energy, a plurality of liquid passages communicating with the ejection outlets to supply the liquid, a plurality of supply inlets for supplying the liquid to the passages and a plurality of electro-thermal transducers provided for the respective ejection outlets to produce the thermal energy. Each of the electro-thermal transducers has a heating surface, on the bottom of a corresponding passage, for heating the liquid, and the width of each passage measured in the direction in which the passages are arranged is a maximum at a position between an end of the electro-thermal transducer element near the ejection outlet and an end thereof near the supply inlet, and the width decreases both toward the ejection outlet and toward the supply inlet. This allows the bubble created in the passage by the transducer to expand freely and provides energy-efficient droplet ejection.

REFERENCES:
patent: 4317124 (1982-02-01), Shirato
patent: 4410899 (1983-10-01), Haruta et al.
patent: 4723136 (1988-02-01), Suzumura
patent: 4752787 (1988-06-01), Matsumoto et al.
patent: 4897674 (1990-01-01), Hirasawa
patent: 5023630 (1991-06-01), Moriyama

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