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US 7,621,622 B2Granted
Liquid ejection head
AssigneeFUJIFILM Corporation
InventorYasuhiko Kachi
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AssigneeFUJIFILM Corporation
InventorYasuhiko Kachi
Estimating the term…
The liquid ejection head comprises: a plurality of pressure chambers which are provided correspondingly to a plurality of ejection holes formed on a first wall defining the pressure chambers, the ejection holes being two-dimensionally arranged and ejecting liquid toward a liquid receiving medium, the pressure chambers accommodating the liquid to be ejected from the ejection holes; a common liquid chamber which supplies the liquid to the pressure chambers; a plurality of piezoelectric elements which are provided correspondingly to the pressure chambers and are arranged on a second wall defining the pressure chambers opposing the first wall, the piezoelectric elements each having individual electrodes to which drive signals are applied; a plurality of extending electrodes which extend from the individual electrodes of the piezoelectric elements and are electrically connected to the individual electrodes; a structural member which is bonded to a first surface of the second wall reverse to a second surface thereof adjacent to the pressure chambers, the structural member having a laminated structure in which at least two members are arranged to overlap each other, the at least two members including an outermost member having a surface in contact with atmosphere and serving as a heat radiating member, the at least two members including at least one member serving as a heat insulating member; a drive circuit which is installed on the outermost member of the structural member, the drive circuit generating the drive signals to be applied to the piezoelectric elements; and a plurality of conducting members which electrically connect the extending electrodes and the drive circuit, the conducting members having vertical conducting portions which are formed in a direction substantially vertical to a plane on which the piezoelectric elements are arranged, and horizontal conducting portions which are formed in a direction substantially perpendicular to the vertical conducting portions, the vertical conducting portions being contained in the structural member.
A liquid ejection head, comprising:
A liquid ejection head comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Generating single droplets or particles on demand: by pressure, e.g. electromechanical transducers
Structure of print heads with piezoelectric elements: of film type, deformed by bending and disposed on a diaphragm
Structure thereof only for on-demand ink jet heads: matrix arrangement of the pressure chambers
Structure thereof only for on-demand ink jet heads: electrical connection
About 4 months of term left · ends 5 Mar 2027 (estimated)
1. Field of the Invention
The present invention relates to a liquid ejection head, and more particularly, to technology for achieving high density arrangement of wiring, drive circuits, and the like, of drive elements which apply an ejection force to liquid to be ejected from ejection holes.
2. Description of the Related Art
The nature of this invention, as well as other objects and advantages thereof, will be explained in the following with reference to the accompanying drawings, in which like reference characters designate the same or similar parts throughout the figures and wherein:
FIG. 1 is a plan view perspective diagram showing the structure of the liquid ejection head according to a first embodiment of the present invention;
FIG. 2 is a cross-sectional diagram along line 2-2 in FIG. 1;
FIG. 1 is a plan view perspective diagram showing the structure of a liquid ejection head (ejection device, hereinafter, simply called a “head”) 10 according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional diagrams showing the three-dimensional structure of the head 10 (a cross-sectional diagram along line 2-2 in FIG. 1).
The head 10 shown in FIG. 1 is an inkjet head mounted in an inkjet recording apparatus which forms a prescribed image on a medium (liquid receiving medium) by means of ink ejected from ejection holes, for example. The head 10 may also be known as a print head, recording head, or the like.
As shown in FIG. 1, the head 10 comprises: nozzles (ejection holes) 12 which eject ink (liquid); pressure chambers 14 having a substantially square planar shape, which accommodate the ink to be ejected from the nozzles 12; supply ports 18 through which the ink is supplied to the pressure chambers 14 from the ink supply system (not shown) through the common liquid chamber (common flow channel) 16; a refill port 20 through which the ink is refilled into the common liquid chamber 16 from the ink supply system; and pads (extending electrodes) 22 extending to the exterior of the piezoelectric elements 26 (not shown in FIG. 1, but shown in FIG. 2) which apply an ejection force to the ink accommodated inside the pressure chambers 14, from the individual electrodes 28 (shown in FIG. 2) provided on these piezoelectric elements.