US 9,809,023 B2Granted

Liquid ejecting device

AssigneeBrother Kogyo Kabushiki Kaisha

InventorsShohei Koide, Keita Hirai

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Abstract

A liquid ejecting device, including: a flow-path defining member having a pressure chamber formed therein; a piezoelectric actuator constituted by a plurality of layers which includes a piezoelectric layer, a common electrode, and an individual electrode, superposed on the flow-path defining member, and having a through-hole communicating with the pressure chamber; an annular conductor disposed on one of opposite surfaces of the piezoelectric actuator remote from the flow-path defining member such that a part of the layers are sandwiched between the annular conductor and the common electrode, the annular conductor surrounding a periphery of the through-hole; and a liquid supply member having a supply path communicating with the through-hole and bonded to the one of the opposite surfaces via the annular conductor, wherein the annular conductor is connected to a terminal configured to be given a predetermined constant potential and is exposed to a flow path defined by the through-hole.

Claims12

Dependent claims

A liquid ejecting device, comprising:

a flow-path defining member in which a plurality of pressure chambers are formed;
a piezoelectric actuator constituted by a plurality of layers stacked on one another and including a piezoelectric layer, a common electrode disposed on one surface side of the piezoelectric layer, and individual electrodes disposed on another surface side of the piezoelectric layer, the piezoelectric actuator being superposed on the flow-path defining member and having through-holes communicating with the respective pressure chambers;
a plurality of annular conductors, each of which surrounds a periphery of a corresponding one of the through-holes, at least one of the plurality of layers being sandwiched between the annular conductors and the common electrode;
a liquid supply member in which a reservoir and supply paths are formed, the supply paths in communication with the reservoir and configured to supply the liquid to the respective pressure chambers through the respective through-holes;
and
an adhesive interposed between the liquid supply member and the plurality of annular conductors,
wherein each of the annular conductors is connected to a terminal configured to be provided with a predetermined constant potential, and is exposed to a flow path defined by a corresponding one of the through-holes.

4 more elements

A liquid ejecting device, comprising:

a flow-path defining member in which a plurality of pressure chambers are formed;
a piezoelectric actuator constituted by a plurality of layers stacked on one another and including a piezoelectric layer, a common electrode disposed on one surface side of the piezoelectric layer, and individual electrodes disposed on another surface side of the piezoelectric layer, the piezoelectric actuator being superposed on the flow-path defining member and having through-holes communicating with the respective pressure chambers;
a plurality of annular conductors, each of which surrounds a periphery of a corresponding one of the through-holes, at least one of the plurality of layers being sandwiched between the annular conductors and the common electrode;
a plurality of contact holes formed through the at least one of the plurality of layers of the piezoelectric actuator so as to electrically connect the annular conductors and the common electrode;
a liquid supply member in which a reservoir and supply paths are formed, wherein the supply paths are in communication with the reservoir, and are configured to supply the liquid to the respective pressure chambers through the respective through-holes;
and
an adhesive interposed between the liquid supply member and the plurality of annular conductors.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/086,480Filed 31 Mar 2016
Priority: JP 2015-18928328 Sep 2015
Published: US 2017/0087842 A130 Mar 2017
Granted: 7 Nov 2017
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

B41J 2/14209
Structure of print heads with piezoelectric elements: of finger type, chamber walls consisting integrally of piezoelectric material
B41J 2/14233
Structure of print heads with piezoelectric elements: of film type, deformed by bending and disposed on a diaphragm
B41J 2002/14241
Of film type, deformed by bending and disposed on a diaphragm: having a cover around the piezoelectric thin film element
B41J 2002/14491
Structure thereof only for on-demand ink jet heads: electrical connection