Ink jet print head

Details Ink jet print head Ink jet print head

1992-03-18

1993-09-28

Reinhart, Mark J.

Recorders

Markers and/or driving means therefor

With ink supply to marker

310333, B41J 2045

Patent

active

052489981

ABSTRACT:
A piezoelectric plate polarized in the direction of its thickness and a base plate having a rigidity lower than that of the piezoelectric plate are joined together. A plurality of parallel grooves are cut through the piezoelectric plate into the base plate so that the grooves are separated from each other by side walls each having an upper portion formed of the piezoelectric plate and a lower portion formed of the base plate. A top plate is attached to the upper surface of the piezoelectric plate to close the upper open ends of the grooves. A nozzle plate provided with a plurality of ink jets is attached to one end of the assembly of the base plate, the piezoelectric plate and the top plate so that the ink jets correspond respectively to the grooves to form pressure chambers. Electrodes are formed by depositing a metal over bottom surface of the grooves and side surfaces of the side walls. In straining the side walls by applying a voltage across the electrodes to jet the ink through the ink jet, the resistance of the lower side walls against the deformation of the upper side walls is relatively small, so that the upper side walls can readily be greatly strained. The piezoelectric plate is formed to an optimum thickness as a function of the reciprocal of the rigidity of the base plate, the elastic constant of the material forming the piezoelectric plate and the height of the side walls.

REFERENCES:
patent: 4525728 (1985-06-01), Koto
patent: 4752788 (1988-06-01), Yasuhara et al.
patent: 4879568 (1989-11-01), Bartky et al.
patent: 4887100 (1989-12-01), Michaelis et al.

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