Abstract: A liquid jet head includes an actuator plate having opposite surfaces with ejection grooves arranged on one surface and a return path arranged on the other surface. A spacer plate has one surface on which the actuator plate is positioned and has a side flow path communicating with the ejection grooves. An air bubble retention suppression unit is provided on the spacer plate and suppresses retention of air bubbles in the side flow path.

Abstract: A liquid ejection head includes: a piezoelectric actuator configured to be deformed depending on a driving pulse applied thereto so as to eject liquid filled in a pressure chamber from a nozzle, a ratio of a first local maximum value which is a largest value among a plurality of local maximum values of an ejection speed of the liquid depending on a pulse width and a second local maximum value which is a second largest value thereamong satisfying a predetermined condition; and a control unit configured to successively apply a first driving pulse and a second driving pulse to the piezoelectric actuator.

Abstract: A liquid jet head includes a nozzle plate having a first nozzle row and a second nozzle row each formed of a plurality of nozzles; and a piezoelectric plate having a plurality of first ejection grooves communicating with respective ones of the plurality of nozzles of the first nozzle row, and a plurality of second ejection grooves communicating with respective ones of the plurality of nozzles of the second nozzle row. The plurality of first ejection grooves and the plurality of second ejection grooves are longitudinally separated from each other in the longitudinal direction of the grooves by a partition wall located between the plurality of first ejection grooves and the plurality of second ejection grooves.

Abstract: The present invention relates to a liquid jet device comprising an actuator plate on which injection channels and non-injection channels are arranged side by side, a cover plate laminated on a surface of the actuator plate and including slits communicating into the injection channels, common electrodes and individual electrodes formed on inner surfaces of the injection channels and the non-injection channels, and common wires and individual wires formed on surfaces of bank portions of the actuator plate, and common pad portions and individual pad portions connected to the common wires and the individual wires, and connected to flexible boards in protruding end portions are formed in a portion of a back surface of the cover plate outside the slits.

Abstract: A carriage includes a base plate, a liquid jet head which includes a support plate attached to the base plate, a first engagement portion which is formed on one end in a Y direction of the support plate, and a fixing tool for positioning the support plate with respect to the base plate, the fixing tool being slidable in an X direction with respect to the base plate and engaged with the first engagement portion. The fixing tool allows movement in the Y direction of the first engagement portion with respect to the fixing tool, and restricts movement in the X direction of the first engagement portion and movement in the thickness direction of the base plate of the first engagement portion with respect to the fixing tool.

Abstract: An exposure portion which exposes a protection plate is formed on a back face of a nozzle plate at a part of a position other than an actuator joining face of the nozzle plate.

Abstract: A liquid jet head includes ejection channels and dummy channels alternately arrayed across partitions to configure a channel row, and drive electrodes that are side surfaces of the partitions and are positioned from upper ends of the partitions in a depth direction, and an average depth of two drive electrodes positioned on facing side surfaces of the ejection channel is different from an average depth of two drive electrodes positioned on facing side surfaces of the dummy channel adjacent to the ejection channel.

Abstract: A liquid jet unit includes a circulation path through which liquid is circulated, and a liquid jet head having an inflow port and an outflow port between which is disposed a flow path forming a part of the circulation path, and a nozzle communicating with the flow path and configured to eject liquid from the liquid jet head. A liquid pump is inserted into the circulation path for circulating liquid in the circulation path. A supply path is connected to the circulation path for supplying liquid to the circulation path. A pressure sensor detects the pressure of liquid in the circulation path and generates corresponding pressure information. The liquid pump is configured to change an amount of liquid to be fed on the basis of the pressure information generated to maintain liquid in the nozzle at a predetermined pressure and draw liquid into the circulation path from the supply path.

Abstract: An individual electrode formed on an inside surface of a dummy channel, a common electrode formed on an inside surface of a discharge channel, an individual pad formed in a connection groove of an actuator plate, connecting the individual electrodes opposed in an X direction across the discharge channel, and to which an FPC is connected, a shallow groove portion opened toward a rear side on the actuator plate, a common pad formed in the shallow groove portion, and connecting the common electrode and the FPC through the shallow groove portion, and a dividing groove formed in a corner portion made by a surface and a rear-side end surface of the actuator plate, and dividing the common pad from the individual pad.

Abstract: A liquid jet head has a head chip which ejects liquid droplets, a nozzle plate in contact with a lower surface of the head chip, a flexible circuit board in contact with the lower surface of the head chip, and a bending member in direct contact with the flexible circuit board and configured to bend the flexible circuit board along a lower corner of the head chip. The nozzle plate and the flexible circuit board contact the lower surface of the head chip in the same plane thereby saving space to enable downsizing of the liquid jet head.

Abstract: A liquid jet head includes a piezoelectric body substrate including a plurality of groove arrays in which a long and narrow ejection groove and a long and narrow non-ejection groove are alternately arrayed in a reference direction. The other side end portion of the ejection groove included in a one side groove array, and a one side end portion of the non-ejection groove included in the other side groove array do not overlap in a thickness direction of the piezoelectric body substrate, and the other side end portion of the ejection groove included in the one side groove array, and a one side end portion of the ejection groove included in the other side groove array communicate, or overlap in the reference direction, of adjacent groove arrays.

Abstract: A liquid jet head includes a piezoelectric body substrate having an array of alternating ejection grooves and non-ejection grooves opening to a surface of the piezoelectric body substrate. Common drive electrodes are provided on opposed side surfaces of the ejection grooves, and individual drive electrodes are provided on opposed side surfaces of the non-ejection grooves. Two individual wirings are electrically separated from each other on the surface of the piezoelectric body substrate at opposite end sides of each non-ejection groove in a longitudinal direction, and the individual wiring at one end side is electrically connected to the individual drive electrode on one side surface of the non-ejection groove, and the individual wiring at the other end side is electrically connected to the individual drive electrode on the other side surface of the non-ejection groove.

Abstract: A liquid jet head includes a head portion having a supply flow path configured to allow liquid supplied from the outside to flow therethrough, a pressure chamber that communicates with the supply flow path, a driver element that drives the pressure chamber, and a nozzle that communicates with the pressure chamber for ejecting liquid droplets. A circuit portion supplies a drive waveform to the driver element. A cooling portion has a cooling flow path configured to allow the liquid to flow therethrough, and the cooling portion is coupled and fixed to the circuit portion to absorb heat energy dissipated by the circuit portion. The supply flow path and the cooling flow path communicate with each other so that the same liquid flows through both paths thereby eliminating the need for a dedicated cooling liquid system and achieving size and cost reduction.

Abstract: A method of manufacturing a liquid jet head includes a through hole forming step of forming through holes on a base plate, an actuator plate bonding step of bonding actuator plates to opposite sides of the base plate, and an electrode forming step of forming electrodes on the bonded base plate and the actuator plates. In the through hole forming step, the through holes are formed on the base plate and the inner surfaces of the through holes are roughened. In the electrode forming step, second extraction electrodes are routed to a principal surface of the base plate through the through holes.

Abstract: A liquid jet head includes a base plate, and an actuator portion fixed to the base plate and having an array of alternating ejection channel and a dummy channel. drive electrodes are formed on inner surfaces of the ejection channels and the dummy channels, and extracting electrodes are formed on the base plate on a rear side of the actuator plate and electrically connected to the drive electrodes. an electrode formation region of the base plate on which are formed the extracting electrodes has a surface roughness greater then that of other regions of the base plate.

Abstract: A liquid jet head includes a head chip and a circuit board connected to the head chip. The head chip includes common terminals arranged in a reference direction. The circuit board includes shared terminals, an upper common wiring, and a through electrode. The shared terminals are provided on a lower surface of the circuit board on the head chip side and are electrically connected to the common terminals. The upper common wiring extends in the reference direction and is provided on a top surface of the circuit board opposite to the head chip. The through electrode electrically connects each of the shared terminals to the upper common wiring.

Abstract: A liquid jet head includes an actuator substrate having an alternating array of ejection grooves and non-ejection grooves which penetrate from an upper surface to a lower surface of the actuator substrate and are longer in a substrate surface direction than in a depth direction. A cover plate attached to the actuator substrate covers upper surface openings of the grooves, and a nozzle plate attached to the actuator substrate covers lower surface openings of the grooves. The grooves are formed in such a manner that configurations of the lower surface openings of the ejection grooves and the non-ejection grooves are different.

Abstract: A liquid jet head includes a piezoeletric body substrate and an opaque substrate bonded to the piezoelectric body substrate. The piezoeletric body substrate has ejection grooves arrayed with an identical pitch P in a reference direction and non-ejection grooves arrayed alternately with the ejection grooves while shifted from the ejection grooves by a half pitch (P/2). The opaque substrate has through holes arrayed in the reference direction. The through holes include a row of through holes corresponding in number to and communicating with the respective ejection grooves, a first through hole arranged outside of one end side of the row of through holes so that it does not communicate with any of the ejection grooves, and a second through hole arranged outside of another end side of the row of through holes so that it does not communicate with any of the ejection grooves.

Abstract: In a method of manufacturing a liquid jet head, a laminated substrate is formed by bonding onto a base substrate piezoelectric substrates having side surfaces joined to each other. Discharge grooves serving as channels for discharging liquid and dummy grooves serving as dummy channels that do not discharge the liquid are formed on a surface of the laminated substrate. The discharge grooves and dummy grooves are alternately arranged relative one another and are parallel to a longitudinal direction of bonding surfaces formed by the joined side surfaces of the piezoelectric substrates. The dummy grooves are formed at the respective bonding surfaces. Drive electrodes are formed on side surfaces of the grooves.

Abstract: A liquid jet head includes a piezoelectric substrate having ejection grooves formed in an upper surface thereof and arranged in a reference direction. A side flow path is formed in a first side surface of the piezoelectric substrate and communicates with the ejection grooves. A cover plate is bonded to the upper surface, and a nozzle plate is bonded to the first side surface and has nozzles communicating with the respective ejection grooves.