Finnegan, Henderson, Farabow, Garrett and Dunner
Ink jet recording head
 An ink jet recording head in which the ink in an ink cavity is jetted in the form of a droplet from an ink nozzle by utilizing a piezo-electric effect. The recording head includes a piezo-electric plate made of piezo-electric material and having a plurality of elongated ink cavities formed therein, and a cover plate fixedly placed on the piezo-electric plate. In one of the embodiments, each of the plurality of elongated ink cavities has two deep grooves formed in the longitudinal direction of the ink cavities and a shallow groove provided between the two deep grooves. Voltage applying electrodes are provided on piezo-electric portions which form the shallow grooves. 
Fuji Electric Co., Ltd.
B B B B B
B41J B41J B41J B41J B41J
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Takeshi Makoto
Yasuhara Nishimura