Ink-jet recording head with piezoelectric device and method for

Details Ink-jet recording head with piezoelectric device and method for Ink-jet recording head with piezoelectric device and method for

1998-03-25

2000-11-07

Pendergrass, Joan

Incremental printing of symbolic information

Ink jet

Ejector mechanism

347 72, B41J 2045

Patent

active

061426156

ABSTRACT:
A piezoelectric device for an ink jet print head that has a greater displacement at a low drive voltage. The ink-jet recording head includes a vibration plate, on which is mounted one or more piezoelectric devices that change the volumes of pressure chambers upon application of a voltage. The device is mounted at least on one face of a pressure chamber substrate that is to be filled with ink. Such piezoelectric device includes a second piezoelectric layer having a piezoelectric constant g of a constant value or higher; and a first piezoelectric layer having a dielectric constant of a specific value or higher. Since the piezoelectric constant d of the piezoelectric device correlates with the product of the largest piezoelectric constant g and the largest dielectric device of the piezoelectric devices, a piezoelectric constant d larger than in the conventional case, i.e., having a greater displacement, can be obtained.

REFERENCES:
patent: 5266964 (1993-11-01), Takahashi et al.
patent: 5301404 (1994-04-01), Ochiai et al.
patent: 5818481 (1998-10-01), Hotomi et al.

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