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 unit is provided with a circulation path through which liquid is circulated, a liquid jet head which includes an inflow port, an outflow port and a flow path between the inflow port and the outflow port, the flow path constituting a part of the circulation path, and ejects liquid from a nozzle communicating with the flow path, a liquid pump which circulates liquid in the circulation path, a supply path which supplies liquid to the circulation path, and a pressure sensor which generates pressure information according to the pressure of liquid in the circulation path. The liquid pump changes the amount of liquid to be fed on the basis of the pressure information to maintain liquid in the nozzle at a predetermined pressure and draw liquid into the circulation path from the supply path.

Abstract: The liquid jet head of the present invention includes a laminate structure obtained by laminating a cover plate, an actuator substrate, and a nozzle plate. The actuator substrate includes a groove array formed by alternately arraying an ejection groove (a first or second ejection groove) and a dummy groove (a first or second dummy groove), and a common chamber communicating with one end of the ejection groove. The cover plate includes one chamber communicating with the common chamber and another chamber (a first or second chamber) communicating with another end of the ejection groove and is provided on a top surface of the actuator substrate so as to cover the groove array. The nozzle plate includes a nozzle communicating with the ejection groove and is provide on a bottom surface of the actuator substrate so as to cover the groove array.

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 including: a nozzle plate including a first nozzle row and a second nozzle row each formed of a plurality of nozzles; and a piezoelectric plate including a plurality of first ejection grooves communicating to the plurality of nozzles of the first nozzle row, and a plurality of second ejection grooves communicating to the plurality of nozzles of the second nozzle row, in which each of the plurality of first ejection grooves and each of the plurality of second ejection grooves are separated from each other by a partition wall located between the each of the plurality of first ejection grooves and the each of the plurality of second ejection grooves.

Abstract: A pressure damper includes a main body portion having a recessed portion with an opening and a communication hole that opens to an inner surface of the recessed portion and communicates to an external region. A flexible thin film closes the opening of the main body portion for reducing pressure fluctuations of fluid in the recessed portion. A detecting portion is engaged with the main body portion for detecting electromotive force generated by electromagnetic induction to thereby detect a relative positional change between the flexible thin film and the main body portion.

Abstract: A head chip includes an actuator substrate having channels for liquid ejection formed therein, and a cover plate having a liquid supply chamber for supplying liquid to the channels, the cover plate being stacked on the actuator substrate. A flow path member mounted to the cover plate supplies the liquid to the liquid supply chamber. The flow path member includes an inflow port through which the liquid flows in, an outflow port through which the liquid flows out, and a circulation path along which the liquid is circulated from the inflow port to the outflow port. No filter is interposed in either the flow path between the inflow port and the channels or the flow path between the outflow port and the channels. The sectional area of the circulation path in a direction orthogonal to the circulating direction of liquid flow is larger than that of the liquid supply chamber.

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 has a jetting portion with nozzles for jetting a liquid that is contained in a liquid container. A liquid storing portion is disposed in a conduit that interconnects the liquid storing portion and the jetting portion and that supplies the liquid in a liquid container to the jetting portion through operation of a pump. The liquid storing portion is configured to dampen fluctuations in the pressure in the conduit. A pressure sensor is disposed in the conduit for measuring a pressure in the conduit. The operation of the pump for supplying the liquid in the liquid container to the jetting portion is controlled based on a value of the pressure measured by the pressure measuring means so that the pressure of the liquid supplied from the conduit to the jetting portion is within a predetermined pressure range.

Abstract: A pressure damper includes a main body portion and a flexible film mounted on the main body portion. The main body portion has upper end portion, a recessed portion having an opening portion opened in the upper end portion, and a communication port opened in an inner surface of the recessed portion to communicate with an outer region of the pressure damper. The upper end portion forms at least one bank that surrounds the opening portion. The at least one bank has a height larger than a height of an upper surface of the main body portion and a width smaller than a width of a side wall of the main body portion. The flexible film is bonded to an upper surface of the bank to close the opening portion.

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 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 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: Provided are a head chip, a liquid jet head, and a liquid jet recording apparatus, which can reduce the effect on image quality due to difference in volume of jetted liquid caused by pressure loss of the liquid during the liquid is in the process of circulating through a liquid flow path. The head chip includes first and second circulation paths (21a and 21b) extending along the longitudinal direction of the head chip so as to communicate to portions of a plurality of liquid jet channels, which are away from nozzle holes on an upstream side. The first and second circulation paths (21a and 21b) enable liquid to flow, the liquid being supplied to the plurality of liquid jet channels, and form liquid flows which are symmetrical with each other in the longitudinal direction of the head chip.

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 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 in a direction in which the element is switched from the first state to the second state to flow 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 for switching the state of driving the element from the first state to the second state to flow.

Abstract: A liquid jet head has a nozzle plate with nozzle holes for ejecting a liquid. A wall portion surrounding the nozzle plate has an opening opposed to the nozzle holes. An opening and closing mechanism is configured in an open state to open the opening of the wall portion to expose the nozzle holes to an exterior of the head, and in a closed state to close the opening of the wall portion to form a closed space between the wall portion and the nozzle plate. A suction flow path has on one end side a suction port opening below the nozzle holes, and another end side is connected to a suction portion that evacuates the closed space to convert the closed space to a negative pressure chamber, thereby supplying the liquid to the nozzle holes. An atmosphere release portion switches between the open and closed states of the mechanism.

Abstract: A liquid jet head chip has a jet plate with jet holes for jetting liquid. A piezoelectric actuator has first and second actuator plates superimposed over one another to form channels communicating with the jet holes. The first actuator plate has first partitions spaced apart from one another to form first groove portions and has first electrodes each disposed on only a portion of a side surface of a respective one of the first partitions. The second actuator plate has second partitions spaced apart from one another to form second groove portions and has second electrodes each disposed on only a portion of a side surface of a respective one of the second partitions. The first partitions of the first actuator plate extend into respective second groove portions of the second actuator plate, and the second partitions of the second actuator plate extend into respective first groove portions of the first actuator plate to form the channels communicating with the jet holes.