Inkjet printing head
First Claim
Patent Images
1. An inkjet printing head comprising;
- a upper and a lower plate having an interval therebetween;
an electrode disposed adjacent said upper plate;
a wall connecting said upper plate with said lower plate;
a nozzle for ejecting ink droplets and arranged on said wall;
a side wall disposed between said upper and lower plates anda piezoelectric actuator disposed between said upper and lower plates having composite shear, tensile, and compressive modes, said actuator including a piezoelectric device polarized in a lengthwise direction, first and second electrodes having different lengths, the first and second electrodes being disposed on an upper or lower part of the piezoelectric device, and a third electrode on the upper or lower end of the piezoelectric device positioned a distance from the first and second electrodes.
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Accused Products
Abstract
Inkjet printing head utilizing a shear mode and, simultaneously, tension and compression modes for effectively preventing damage to the contact interface of the piezoelectric device, includes at least one piezoelectric device installed on a pressure channel, having shear, tension and compression modes and combined with the upper and lower plates of the channel, the piezoelectric device having electrodes supplying an electrical field thereof.
28 Citations
19 Claims
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1. An inkjet printing head comprising;
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a upper and a lower plate having an interval therebetween; an electrode disposed adjacent said upper plate; a wall connecting said upper plate with said lower plate; a nozzle for ejecting ink droplets and arranged on said wall; a side wall disposed between said upper and lower plates and a piezoelectric actuator disposed between said upper and lower plates having composite shear, tensile, and compressive modes, said actuator including a piezoelectric device polarized in a lengthwise direction, first and second electrodes having different lengths, the first and second electrodes being disposed on an upper or lower part of the piezoelectric device, and a third electrode on the upper or lower end of the piezoelectric device positioned a distance from the first and second electrodes. - View Dependent Claims (2)
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3. An inkjet printing head comprising:
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an upper and a lower plate having an interval therebetween;
.an electrode disposed adjacent said upper plate; a wall connecting said upper plate with said lower plate; a nozzle for ejecting ink droplets and arranged on said wall; a side wall disposed between said upper and lower plates and a piezoelectric actuator disposed between said upper and lower plates having composite shear, tensile, and compressive modes, said actuator including an upper piezoelectric device polarized perpendicular to a lengthwise dimension, first and second electrodes disposed on either side of the upper piezoelectric device, a lower piezoelectric device polarized parallel to a lengthwise dimension, and third and fourth electrodes disposed on either side of the lower piezoelectric device, the upper and lower piezoelectric devices being combined with each other end to end and parallel to the lengthwise dimension. - View Dependent Claims (4)
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5. An inkjet printing head comprising:
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an upper and a lower plate having an interval therebetween; an electrode disposed adjacent said upper plate;
.a wall connecting said upper plate with said lower plate; a nozzle for ejecting ink droplets and arranged on said wall; a side wall disposed between said upper and lower plates and a piezoelectric actuator disposed between said upper and lower plates having composite shear, tensile, and compressive modes, said actuator including a piezoelectric device polarized perpendicularly to said channel and at an arbitrary angle to a lengthwise direction, and first and second electrodes of different lengths disposed on respective first and second sides of said piezoelectric actuator. - View Dependent Claims (6)
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7. An inkjet printing head comprising:
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a nozzle; a channel in fluid communication with said nozzle for supplying ink to said nozzle; a channel electrode disposed within said channel; a composite shear mode, tensile mode and compression mode piezoelectric actuator including at least first and second actuator electrodes, said piezoelectric actuator being disposed within said channel; means for supplying a voltage to said at least first and second actuator electrodes to cause said piezoelectric actuator to move in a first direction; and means for supplying a voltage to said channel electrode to cause said piezoelectric actuator to move in a second direction perpendicular to the first direction to change pressure in said channel and force ink through said nozzle. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification