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Shear Mode Planar Piezoelectric Driver for Drop-on-Demand Ink Jet

IP.com Disclosure Number: IPCOM000041085D
Original Publication Date: 1987-Jul-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Lee, FC: AUTHOR [+3]

Abstract

Piezoelectric driver for a drop-on-demand ink jet printing head utilizes the shear mode in a planar array.

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This is the abbreviated version, containing approximately 97% of the total text.

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Shear Mode Planar Piezoelectric Driver for Drop-on-Demand Ink Jet

Piezoelectric driver for a drop-on-demand ink jet printing head utilizes the shear mode in a planar array.

The print head (Fig. 1) comprises a substrate 1 having a plurality of fluid channels 2. One end of the fluid channels 2 is connected to an ink reservoir (not shown) via conventional designs, and the opposite end of the fluid channels 2 leads to the nozzle orifice (not shown). The piezoelectric driver 3 is formed of two planar piezoelectric plates 4 in which the polarization vector P is set across the thickness of the plates 4. The electrodes 5 are patterned to form an applied electric field perpendicular to the polarization vector P.

When a voltage pulse is applied to the electrodes 5, the arrangement of the plates 4 causes the piezoelectric material to vibrate upward and downward without constraints from the adjacent material i.e. shear mode vibration. Each element in the driver array can be pulsed independently without producing cross- talk to the other elements within the array.

In the embodiment shown in Figs. 2 and 3, the array is produced from a continuous piezoelectric sheet 6 in which surface electrodes 7 are patterned on both the top and bottom surfaces of continuous piezoelectric sheet 6. Corresponding electrodes 7 on top and bottom of the sheet 6 are bridged together at the ends of the sheet 6 and the same concept is used of having the drive electric field perpendicular to the polar...