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 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 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: In a method of manufacturing a liquid jet head, a piezoelectric substrate is bonded onto a first base. Ejection grooves for ejection channels and dummy grooves for dummy channels are alternately formed in parallel with one another. The ejection grooves and the dummy grooves have such a depth as to pierce the piezoelectric substrate and to reach the first base substrate. An electrode material is deposited on inner surfaces of the ejection grooves and the dummy grooves. A cover plate is bonded to the piezoelectric substrate so as to cover the ejection grooves and the dummy grooves. In a subsequent first base substrate removing step, a part of the first base substrate on a side opposite to the cover plate and the electrode material deposited on bottom surfaces of the dummy grooves are removed. A second base substrate is then bonded to the first base substrate.

Abstract: A liquid jet head has a nozzle plate including nozzles for ejecting liquid and side walls placed over the nozzle plate, the side walls forming grooves having a fixed depth in a longitudinal direction thereof. Drive electrodes are formed on wall surfaces of the side walls. A cover plate is placed on upper surfaces of the side walls and has a supply port for supplying liquid to the grooves and a discharge port for discharging liquid from the grooves. Sealing materials are placed for closing the grooves outside communicating portions between the grooves and the supply port and between the grooves and the discharge port to prevent leakage of liquid from the grooves.

Abstract: A liquid jet head has a piezoelectric, a pair of electrodes for applying an electric field, and a drive section for driving the piezoelectric body. The drive section drives the piezoelectric body by setting a voltage of one of the electrodes to a first low voltage having a relatively small absolute value, and by supplying a drive signal of one polarity to the other electrode. The driving section restores the piezoelectric body by setting the voltage of the one electrode to a high voltage having the same one polarity as the drive signal and having a relatively large absolute value, and by setting a voltage of the other electrode to a second low voltage having a relatively small absolute value. The drive section applies a voltage for generating an electric field exceeding a coercive field of the piezoelectric body to the pair of electrodes.

Abstract: A liquid jet head has side walls forming grooves and drive electrodes formed on wall surfaces of the side walls. A reinforcing plate includes through holes communicating with the grooves and being elongated in a longitudinal direction of the grooves. A nozzle plate includes nozzles communicating with the through holes of the reinforcing plate. A cover plate has a supply port for supplying liquid to the grooves and a discharge port for discharging liquid from the grooves.

Abstract: A liquid jet head includes a base plurality of pressure chambers which include recesses, respectively, arranged in a front surface of a base. A piezoelectric substrate is joined to upper surfaces of side walls of the recesses and is uniformly polarized in a direction parallel to a substrate surface of the piezoelectric substrate. A pair of a front surface drive electrode and a back surface drive electrode are provided on a front surface of the piezoelectric substrate, which is opposite to the pressure chamber side, and on a back surface of the piezoelectric substrate on the pressure chamber side, respectively, for each chamber and sandwich the piezoelectric substrate therebetween and extend to a side wall of the recess substantially from a center of the open end. A liquid chamber is formed in the base and communicates with the pressure chambers via openings formed in bottom surfaces or side wall surfaces of the recesses, respectively.

Abstract: A liquid jet head includes an actuator substrate having grooves, and a flexible substrate for supplying a drive signal to the actuator substrate. On a surface of the actuator substrate, in the vicinity of a rear end thereof, are formed a common extension electrode and an individual extension electrode connected to drive electrodes of a discharge channel and dummy channels, respectively. The common extension electrode and the individual extension electrode are connected to a common wiring electrode and an individual wiring electrode of the flexible substrate, respectively. In a common wiring intersection region in which the common wiring electrode of the flexible substrate intersects the drive electrodes of the actuator substrate, upper end portions of the drive electrodes on side surfaces of the dummy channels are formed deeper than the substrate surface.

Abstract: A liquid jet head has an actuator substrate with discharge and dummy channels alternately arranged so as to extend between front and rear ends of the actuator substrate through intermediation of partition walls. Drive electrodes are arranged on respective ones of the partition walls, and first and second electrode terminals corresponding to the discharge channels are electrically connected to respective ones of the drive electrodes and are arranged on the surface of the actuator substrate in the vicinity of the rear end thereof. A flexible substrate is mounted to the actuator substrate at a vicinity of the rear end thereof. A common wiring electrode and individual wiring electrodes are formed on the flexible substrate. The common wiring electrode is connected in common to the first electrode terminals, and the individual wiring electrodes are individually connected to the second electrode terminals so as to be electrically independent of one another.

Abstract: A liquid jet head includes a nozzle plate having at least one nozzle for ejecting a liquid onto a recording medium, a cover plate having a liquid supply hole supplying the liquid and a liquid discharge hole discharging the liquid, and a piezoelectric plate having at least one elongated groove. The piezoelectric, cover and nozzle plates are stacked relative one another with the elongated groove communicating with the nozzle and with each of the liquid supply hole and the liquid discharge hole so that liquid supplied into the elongated groove through the liquid supply hole circulates through the elongated groove and is discharged from the liquid discharge hole. The elongated grooves includes a deep groove and a shallow groove, with a cross-section of the deep groove in a depth direction thereof being convex in shape, and the nozzle communicating with the deep groove at a tip of the convex shape.

Abstract: Manufacturing a liquid jet-head (1) by forming an electrode pattern by grinding method after a conductive film (8) is formed, provided is method of manufacturing the liquid jet-head, including: forming terminal region on top surface of an actuator substrate (2) in the vicinity of rear end; forming a plurality of ejection grooves (4) arranged in parallel to each other from front end toward the terminal region; forming a shallow groove in the terminal region; forming the conductive film on the top surface, side surface and bottom surface of each of the ejection grooves, and side surface and bottom surface of the shallow groove (6); grinding and removing the conductive film formed on the top surface; bonding a cover plate (10) while exposing the terminal region and covering the ejection grooves; and adhering a nozzle plate (12) to side surface of the actuator substrate, at which the ejection grooves are opened.

Abstract: A liquid jet apparatus includes a nozzle plate having at least one nozzle for ejecting a liquid onto a recording medium, a cover plate having a liquid supply hole for supplying the liquid and a liquid discharge hole for discharging the liquid, and a piezoelectric plate having at least one elongated groove. The piezoelectric plate, cover plate and nozzle plate are stacked relative one another with the at least one elongated groove communicating with the at least one nozzle of the nozzle plate and with each of the liquid supply hole and the liquid discharge hole of the cover plate so that liquid supplied into the at least one elongated groove through the liquid supply hole circulates through the at least one elongated groove and is discharged from the liquid discharge hole.

Abstract: A liquid jet head is provided with an actuator substrate having grooves spaced apart from one another through an intermediation of partition walls. Drive electrodes are formed on confronting side surfaces of the partition walls so as not to be electrically connected to one another and are configured to be driven independently from one another to independently deform the partition walls. Each of the partition walls has a first portion made of a first material and extending from a base surface of the corresponding groove, and has a second portion extending from the first portion and being made of a second material having a higher permittivity than that of the first material. A cover plate is mounted on the actuator substrate so as to cover the grooves, and a nozzle plate has nozzles communicating with respective ones of the grooves.

Abstract: The liquid jet head (1) includes: a piezoelectric substrate (4) including a plurality of grooves (5) which are formed therein from a front end (FE) to a rear end (RE) of a surface of the substrate and separated from one another by side walls (3), the piezoelectric substrate having lead-out electrodes (8) formed on top surfaces of the side walls (3); a cover plate (11) which includes a manifold (9) and is bonded to the surface of the piezoelectric substrate (4); and a sealing material (14) for blocking, of channels formed by the cover plate (11) and the grooves (5), openings of rear channels (10) formed on the rear end (RE) side with respect to the manifold (9).

Abstract: Provided is a highly durable liquid jet head capable of improving conversion efficiency in converting deformation of side walls (6) into change in capacity of grooves (5). A liquid jet head (1) includes side walls (6) forming grooves (5), a reinforcing plate (17) which is formed of a ceramic material and is placed below the side walls (6), a nozzle plate (4) including nozzles (3) communicating with the grooves (5), respectively, the nozzle plate being placed on the reinforcing plate (17) on a side opposite to the side walls (6), drive electrodes (7) formed on wall surfaces (WS) of the side walls (6), and a cover plate (10) placed above the side walls (6), the cover plate including a supply port (8) for supplying liquid to the grooves (5) and a discharge port (9) for discharging liquid from the grooves (5).

Abstract: A liquid jet head (1) includes a nozzle plate (4) including nozzles (3) for ejecting liquid, side walls (6) placed above the nozzle plate (4), the side walls (6) forming grooves (5) having a fixed depth in a longitudinal direction thereof, drive electrodes (7) formed on wall surfaces of the side walls (6), for selectively deforming the side walls (6), a cover plate (10) placed on upper surfaces (US) of the side walls (6), the cover plate (10) including a supply port (8) for supplying liquid to the grooves (5) and a discharge port (9) for discharging liquid from the grooves (5), and sealing materials (11) for closing the grooves (5) outside communicating portions between the grooves (5) and the supply port (8) and between the grooves (5) and the discharge port (9). Accordingly, an outside shape of the liquid jet head is downsized and patterning of electrodes is facilitated.

Abstract: A head chip unit comprises a first head chip having a first ink chamber configured to contain first ink and having a first channel in communication with the first ink chamber for receiving the first ink from the first ink chamber and via which the first ink is discharged in an ink supply direction of the head chip unit. A second head chip is laminated with the first head chip along a laminating direction generally orthogonal to the ink supply direction.