Abstract: A method of manufacturing a head chip includes a groove forming step for forming grooves which are the bases of ejection grooves on a first surface of the actuator substrate, a substrate grinding step for grinding a second surface of the actuator substrate so that each of the grooves has a predetermined depth, a recessed portion forming step for forming an inspection recessed portion which changes its state in the second surface of the actuator substrate according to the grinding amount of the actuator substrate in the substrate grinding step, and a grinding amount determination step for determining the grinding amount of the actuator substrate on the basis of a state of the inspection recessed portion after the substrate grinding step.

Abstract: A method of manufacturing a liquid jet head includes: a groove forming step of alternately forming ejection grooves and non-ejection grooves in a reference direction on an upper surface of an actuator substrate; a cover plate processing step of forming a recessed portion on an upper surface of a cover plate and slits penetrating the cover plate from a bottom surface of the recessed portion through a lower surface located opposite to the upper surface of the cover plate; a substrate bonding step of bonding the lower surface of the cover plate to the upper surface of the actuator substrate to allow the slits to communicate with the respective ejection grooves; and an electrode forming step of simultaneously forming conductive films on side surfaces of the ejection grooves, side surfaces of the non-ejection grooves, and inner surfaces of the slits and the recessed portion.

Abstract: A liquid jet head has spaced-apart side walls that form alternating ejection channels and non-ejection channels. The side walls comprise two piezoelectric materials polarized in opposite directions and laminated together with a polarization boundary interposed between them. Upper and lower members are fixed to respective upper and lower ends of the side walls and overlie upper and lower ends of the channels. Electrodes on opposed wall surfaces of the side walls extend from the upper ends of the side walls to either the vicinity of the polarization boundary or to below the polarization boundary and above the lower ends of the side walls. The polarization boundary is positioned above one-half the depth of the channels to improving the driving efficiency of the piezoelectric body.

Abstract: A liquid jet head includes a piezoelectric body substrate having an upper surface, a lower surface, at least two groove arrays each having ejection grooves penetrating from the upper surface to the lower surface, and a first opening portion penetrating from the upper surface to the lower surface between the at least two groove arrays. Drive electrodes are provided on side surfaces of the ejection grooves and terminal electrodes are electrically connected to the drive electrodes. A flexible circuit board is electrically connected to the terminal electrodes and extends from the lower surface to the upper surface of the piezoelectric body substrate through the first opening portion.

Abstract: The liquid jet head is provided with a piezoelectric substrate having a plurality of groove rows in each of which elongated ejection grooves and elongated non-ejection grooves are alternately arranged in a reference direction. The groove rows are arranged next to one another in the longitudinal direction of the grooves, and in adjacent ones of the groove rows, the right ends of ejection grooves included in a groove row located on a left side and the left ends of non-ejection grooves included in a groove row located on the right side are separated from each other, and overlap each other in a thickness direction of the piezoelectric substrate.

Abstract: A liquid jet head includes an actuator substrate having a principal surface on which ejection channels and non-ejection channels are formed, common electrodes formed on side surfaces of the ejection channels, individual electrodes formed on side surfaces of the non-ejection channels, individual electrode pads for connection to the individual electrodes, and common electrode pads for connection to the common electrodes. A groove is formed on the principal surface of the actuator substrate for isolating the individual electrode pads and the common electrode pads from one another. An external substrate has individual electrode terminals and common electrode terminals for connection to the individual electrode pads and common electrode pads, respectively. A connection wiring that connects the common electrode terminals to each other is formed along the groove to prevent an electrical short circuit between the connection wiring and the individual electrodes.

Abstract: A liquid jet head includes a piezoelectric body substrate on which ejection grooves penetrating from an upper surface to a lower surface and non-ejection grooves open on the lower surface are alternately arranged in a reference direction and form a groove row, a cover plate that includes a liquid chamber communicating with the ejection grooves is bonded on the upper surface of the piezoelectric body substrate, and a nozzle plate that includes nozzles communicating with the ejection grooves is bonded on the lower surface of the piezoelectric body substrate. Common drive electrodes are installed on side surfaces of the ejection grooves, which are on the lower-surface side from nearly ½ the depth of the ejection grooves, and individual drive electrodes are installed on side surfaces of the non-ejection grooves, which are on the lower-surface side from nearly ½ the depth of the non-ejection grooves.

Abstract: A liquid jet head includes base plates, a first actuator plate and a second actuator plate separately arranged on one principal planes of the base plates, and configured to jet a liquid, first extracting electrodes electrically connected to first drive electrodes, on the one principal plane of the first base plate, and second extracting electrodes electrically connected to second drive electrodes, on the one principal plane of the second base plate. The second extracting electrodes are pulled out on the one principal plane through through holes formed in the base plates.

Abstract: A liquid jet head has a piezoelectric body substrate which includes a groove row in which ejection grooves penetrating the piezoelectric body substrate from an upper surface through a lower surface and non-ejection grooves open on the upper surface are alternately arranged in a reference direction, common drive electrodes formed on both side surfaces of each of the ejection grooves, and individual drive electrodes formed on both side surfaces of each of the non-ejection grooves. A cover plate is bonded to the upper surface of the piezoelectric body substrate and includes a liquid chamber communicating with the ejection grooves, first through electrodes which penetrate the cover plate in a thickness direction and are electrically connected to the individual drive electrodes, and individual terminals placed on a front surface of the cover plate opposite to the piezoelectric body substrate and electrically connected to the first through electrodes.

Abstract: A liquid jet head includes an ejecting portion having a first head chip and a second chip which are laminated with each other, and a circuit board which outputs a drive signal for driving the ejecting portion. A first connection board electrically connects the first head chip to the circuit board, and a second connection board electrically connects the second head chip to the circuit board. A bend portion is provided in the circuit board so that by bending the circuit board at the bend portion, the first electrode terminal portion and the second electrode terminal portion are made to extend in the same direction, and face each other in the lamination direction of the head chips. The circuit board has a connecting terminal that is exposed to the outside through a window in the circuit board when the circuit board is bent at the ending portion.

Abstract: A liquid jet head includes an actuator substrate on which a plurality of grooves is arranged, and a nozzle plate having nozzle holes communicated with the grooves. Drive electrodes extend in the longitudinal direction along both side surfaces of a wall portion of the grooves. An insulating film is disposed between the wall portion and the longitudinal end portions of the drive electrodes so that only the mid-portion of the drive elecrodes directly contacts the side surfaces of the wall portion. When a voltage is applied to the drive electrodes, only the region of the wall portion in the vicinity of the nozzle holes is actuated to eject liquid from the nozzle holes.

Abstract: A liquid jet head includes a flow path member having a supply port through which liquid is supplied and a discharge port through which the liquid is discharged, and a cover plate having a liquid supply chamber that communicates with the supply port and a liquid discharge chamber that communicates with the discharge port. An actuator substrate has a plurality of parallel channels that extend between the liquid supply chamber and the liquid discharge chamber and the channels communicate with respective nozzles formed in a nozzle plate. The flow path member, cover plate, actuator substrate and nozzle plate constitute a laminated structure. A communication path is provided in one or both of the cover plate and flow path member for bypassing the liquid from the liquid supply chamber to the liquid discharge chamber so that air bubbles trapped in the liquid can be effectively discharged to the outside.

Abstract: A liquid jet head is provided with laminated head chips forming a laminated structure. Each of the head chips has an actuator portion and a nozzle plate bonded to a first end face of the actuator portion. The actuator portion of each head chip has a filter, a first liquid chamber communicating to a downstream side of the filter, a channel communicating to the first liquid chamber for inducing pressure on liquid therein, and an electrode terminal for transmitting a drive signal to the channel. The nozzle plate has a nozzle communicating to the channel of the actuator portion. The surfaces of the nozzle plates of the respective head chips are flush with one another.

Abstract: A method of manufacturing a liquid jet head comprises forming a terminal region on a top surface of an actuator substrate in the vicinity of a rear end thereof, and forming on the top surface a plurality of alternately arrayed ejection grooves and dummy grooves arranged in parallel to each other from a front end toward the terminal region. Shallow grooves are formed in the terminal region, and a conductive film is formed on the top surface, side surface and bottom surface of each of the ejection grooves, and on the side surface and bottom surface of the shallow grooves. The conductive film is removed from the top surface by grinding, and a cover plate is bonded to the actuator substrate so as to expose the terminal region and cover the ejection grooves. A nozzle plate is adhered to a side surface of the actuator substrate at which the ejection grooves are opened.

Abstract: A liquid jet head includes an actuator substrate having a plurality of elongated grooves arrayed from an upper surface to a lower surface thereof. The grooves are formed from a vicinity of a peripheral end on one side of the actuator substrate to a peripheral end the other side thereof, ends of the grooves in a longitudinal direction thereof have respective inclined surfaces rising from the lower surface to the upper surface of the actuator substrate, and a crossing angle at crossing portions at which the inclined surfaces and the lower surface cross each other is in a range of 3 degrees to 80 degrees. A width W of the inclined surfaces in the longitudinal direction thereof and a thickness D of the actuator substrate satisfy a relationship 0.2?(W/D)?11 at the ends on one side of the grooves.

Abstract: A liquid jet head includes an actuator portion having a first recessed portion, second recessed portions, and left and right channel rows provided between the first and second recessed portions, respectively, and being offset in a row direction by 1/2 of a channel pitch. Each of the left and right channel rows includes channels each having one end portion opened to the first recessed portion and another end portion opened to one of the second recessed portions. The channels are formed of grooves each sandwiched by two of a series of walls extending from the first recessed portion to one of the second recessed portions. A width of the walls corresponding to one of the left and right channel rows being equal to a width of the grooves corresponding to the other of the left and right channel rows.

Abstract: A liquid jet head includes a nozzle guard attached to a nozzle plate. The nozzle guard functions as a liquid storage unit and is configured to store residual liquid that attaches to the nozzle plate. Channel lines include ejection and non-ejection channels and a dummy channel incapable of driving. Liquid is supplied into the dummy channel while being brought to a negative pressure. The nozzle plate includes a dummy nozzle hole that communicates with the dummy channel, and the dummy nozzle hole is provided at a position to aspirate stored residual liquid using the nozzle guard.

Abstract: A liquid jet head has an actuator substrate, a cover plate and a nozzle plate. The actuator substrate includes a groove array formed by alternately arraying an ejection groove and a dummy groove, and a common chamber communicating with one end of the ejection groove but not communicating with the dummy groove. The cover plate is provided on a top surface of the actuator substrate so as to cover the groove array, and includes one chamber communicating with the common chamber and another chamber communicating with another end of the ejection groove. The nozzle plate is provided on a bottom surface of the actuator substrate so as to cover the groove array, and includes a nozzle communicating with the ejection groove.

Abstract: A liquid jet head includes an actuator portion having a first recessed portion, a second recessed portion, sidewalls made of a piezoelectric material and forming grooves provided between and communicating with respective ones of the first and second recessed portions, drive electrodes provided on respective ones of the sidewalls, and electrode terminals for transmitting a drive signal to respective ones of the drive electrodes. A cover plate has a first liquid chamber communicating with the first recessed portion for supplying liquid to the grooves and having a second liquid chamber communicating with the second recessed portion for discharging liquid from the grooves. A nozzle plate has nozzles communicating with respective ones of the grooves for ejecting liquid supplied to the grooves due to deformation of the sidewalls upon transmission of a drive signal by the electrode terminals to respective ones of the drive electrodes.

Abstract: A device includes a drive portion for driving a pressure generating element and controlling a state of driving the element. The drive portion includes a first drive section for causing a first current to flow to drive the element, and a second drive section for causing a second current smaller than the first current to flow to drive the element. The state of driving the element includes a first state and a second state. The second drive section causes the second current to flow in a direction in which the element is switched from the first state to the second state at a timing that is faster by a predetermined time determined in advance with respect to a timing at which the first drive section causes the first current to flow for switching the state of driving the element from the first state to the second state.