Abstract: A liquid jet head (1) has an actuator portion (2). The actuator portion includes: a first recessed portion (6), left and right second recessed portions (7L, 7R) formed at a distance from the first recessed portion and provided so as to sandwich the first recessed portion therebetween; and left and right channel rows (9L, 9R) provided between the first recessed portion and the left and right second recessed portions, respectively, the left and right channel rows each including a plurality of channels arrayed therein, the plurality of channels each having one end portion opened to the first recessed portion and another end portion opened to one of the left and right second recessed portions. The left channel row (9L) and the right channel row (9R) are offset in a row direction by ½ of a channel pitch.

Abstract: Provided is a liquid jet head (1), including a plurality of head chips (2) each including an actuator portion (3) and a nozzle plate (4). The actuator portion (3) includes: a filter (7); a first liquid chamber (5) communicating to a downstream side of the filter (7); a channel (8) communicating to the first liquid chamber (5), for inducing pressure on liquid therein; and an electrode terminal (10) for transmitting a drive signal to the channel (8). The head chips (2) each include the nozzle plate (4) bonded to a first end face (F1) of each actuator portion (3). The nozzle plates (4) are provided so that surfaces thereof flush with one another. This enables inspection of the respective head chips (2) before the respective head chips (2) are laminated and assembled, so that only head chips which have passed inspection can be laminated and assembled.

Abstract: The liquid jet head (1) has an actuator portion (2). The actuator portion includes a first recessed portion (6), a second recessed portion (7) formed at a distance therefrom, a channel row (9) provided between the first recessed portion and the second recessed portion, the channel row including a plurality of channels (8) arranged therein, the plurality of channels each having one end portion opened to the first recessed portion and the other end portion opened to the second recessed portion, and an electrode terminal row (11) including a plurality of electrode terminals (10) provided on a front surface on an outer peripheral side with respect to the second recessed portion or the first recessed portion, the electrode terminals transmitting a drive signal to the channel row. The electrode terminals for connection to an outside circuit are formed on a side opposite to a liquid droplet ejection side.

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: To prevent deterioration of an ejection characteristic, which is caused by adhesion of an air bubble mixed in liquid to channels (6) and slits (13) communicated therewith, provided is a liquid jet head, including: a supply port (2) through which liquid is supplied; a discharge port (3) through which the liquid is discharged; a liquid supply chamber (4) communicated with the supply port (2); a liquid discharge chamber (5) communicated with the discharge port (3); a channel row (7) forced of a plurality of channels (6), which are provided in parallel between the liquid supply chamber (4) and the liquid discharge chamber (5) and communicated with the liquid supply chamber (4) and the liquid discharge chamber (5); and a communication path (9) for bypassing the liquid from the liquid supply chamber (4) to the liquid discharge chamber (5). An air bubble is removed outside via the communication path (9).

Abstract: A liquid jet head has an actuator with grooves arranged on a surface of a substrate. The actuator is configured to discharge liquid from nozzles communicating with respective ones of the grooves. A flow path member supplies the liquid to the grooves of the actuator. A damper member is provided between the actuator and the flow path member for coupling the actuator and the flow path member to each other. The damper member is bonded with an adhesive to each of the actuator and the flow path member.

Abstract: A liquid injection head has a nozzle body having a row of nozzle holes and a nozzle guard that covers the row of nozzle holes. The nozzle guard has a top portion having formed therein a slit opposed to the row of nozzle holes, a sealing portion that seals an area between a peripheral edge of the top portion and the nozzle body, and a suction flow path having a suction port opening below the row of nozzle holes and communicating with a space on an inner side of the nozzle guard. A suction section connected to the suction flow path of the nozzle guard causes the space on the inner side of the nozzle guard to form a negative pressure chamber such that a liquid overflowing into the negative pressure chamber is sucked from the suction port of the suction flow path.

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: A pressure damper includes a recess portion for storing liquid, and a flexible film that covers an opening of the recess portion. A liquid inflow port and a liquid outflow port communicate with the recess portion. A pressure detecting portion detects a pressure value of the liquid flowing out from the liquid outflow port, and a control circuit portion outputs a drive signal based on the pressure value of the pressure detecting portion. A pressure adjusting portion adjusts the pressure in the recess portion by forcibly deforming the flexible film based on the drive signal output from the control circuit portion. The pressure damper reliably suppresses change in the discharge amount of ink due to pressure fluctuation.

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.

Abstract: A liquid-jet head chip includes an actuator substrate having liquid discharge flow paths for discharging a liquid and disposed parallel to and at a distance from each other. Each of the liquid discharge flow paths is open on a surface of the actuator substrate. A cover plate substrate is bonded onto the surface of the actuator substrate and has an opening portion that opens on a surface of the cover plate substrate on a side opposite to the actuator substrate. The opening portion includes a concave portion and through-holes extending from the concave portion and communicating with the liquid discharge flow paths. A filter structure is disposed at an approximately constant distance from the surface of the cover plate substrate to which the actuator substrate is bonded. The filter structure is located at a position so as to substantially close the opening portion of the cover plate substrate.

Abstract: A liquid jet recording apparatus adjusts the pressure of liquid jetted from a jetting portion toward a recording medium. The liquid jet recording apparatus has a pressure sensor provided in a tube between a liquid storing portion and a roller tube pump. The pressure of the liquid which flows through the tube is measured, and a pressure value is sent to a control portion. The pressure value is compared with lower limit values and upper limit values stored in a definition file stored in the control portion, and a corresponding drive signal is sent to a drive portion to drive the roller tube pump in a forward or a reverse direction to adjust the pressure of the liquid in the jetting portion.

Abstract: A liquid jet recording apparatus includes a liquid container that contains liquid, a jetting portion disposed at a lower level than the surface of the liquid contained in the liquid container for jetting the liquid, and a conduit for communicating the jetting portion with the liquid container. An on-off valve opens or closes the conduit to permit or block the flow of the liquid in the conduit. A liquid storing portion damps pressure fluctuations of the liquid which flows in the conduit and is disposed in the conduit between the on-off valve and the jetting portion. A pressure sensor measures the pressure of the liquid in the conduit, and a control portion controls the on-off valve to be opened or closed based on a pressure value measured by the pressure sensor.

Abstract: To simplify a head-chip is provided with an actuator including grooves and a cover plate bonded onto the one surface of the actuator and including an opening portion including an ink chamber having an aperture plane being open on an upper end surface and slits extending from the ink chamber to be in communication with the grooves, and an flow path for bringing the upper end surface and one end surface extending in a thickness direction into communication with each other, the opening portion and the flow path being provided independently of each other. In the head-chip, foreign substance removal filter for removing a foreign substance is provided at a position at which the aperture plane of the ink chamber is substantially closed, and a filter for allowing passage of air bubbles, is provided at a position at which an opening of the flow path is substantially closed.

Abstract: A pressure buffer is disposed in an ink supply path that connects an ink supply source to an ink-jet head to suppress pressure fluctuations due to vibrations created by movement of a carriage. The pressure buffer includes a chamber having an ink flow inlet through which ink flows from the ink supply source into the chamber and an ink flow outlet through which the ink flows from the chamber to the ink-jet head. A partition wall disposed within the chamber extends at least partly along a side wall of the chamber to define an ink flow path that communicates at its upper end with the chamber and at its lower end with the ink flow outlet. A through-opening is provided in the partition wall in the vicinity of the ink flow outlet and through which the ink flows between the ink flow path and the chamber to suppress pressure fluctuations in the ink flow path. Alternatively, an air pocket may be provided in the partition wall in the vicinity of the ink flow outlet to reduce presure fluctuations in the ink flow path.

Abstract: A head chip has an actuator plate having a plurality of grooves, a drive electrode formed on each of the side walls of the grooves, and a cover plate which has an introduction aperture. A nozzle plate is fixed to an end surface of the actuator plate through an adhesive and has a plurality of nozzles which communicate with respective ones of the grooves. A number of escape holes are formed between the nozzle plate and the actuator plate, corresponding in number to the number of nozzles, and each escape hole has a contour which surrounds a periphery of each nozzle with the contour being spaced apart from a contour of each nozzle by at least a given distance so that the adhesive remaining at the time of fixing the nozzle plate is accumulated in the escape holes.

Abstract: To provide a method of effectively reducing the amount of ink droplets remaining on a nozzle surface after a cleaning operation, and an inkjet recording apparatus capable of shortening an entire processing time of an initial filling operation and a cleaning operation by shortening an ink discharge operation time. By providing a partition wall so that a suction port and an atmosphere opening port provided on a back side of a porous sheet placed in a cap are not directly communicated with each other, in an ink discharge operation in the cap, air having entered through the atmosphere opening port flows through a space between the porous sheet and the nozzle surface, and thereafter, flows to the suction port via the porous sheet. Therefore, ink droplets remaining adhering to the nozzle surface can be removed using the force of air flow.

Abstract: A head chip for a liquid jet recording device has a pair of piezoelectric elements that form a liquid jet channel therebetween, a common electrode formed on a surface of each piezoelectric element on the liquid jet channel side, and a drive electrode formed on an opposite surface of the piezoelectric element. A cover plate is joined so as to cover a common terminal connected to the common electrode, and an integrated wiring that integrates and electrically connects all of the common terminals is formed on a surface of the cover plate. The integrated wiring is connected to the common terminals through the contact plugs formed in through-holes of the cover plate. Integrated terminals connected to the integrated wiring and drive terminals connected to the drive electrodes are arranged in line at an end of an actuator plate.

Abstract: Provided is a pressure damper, a liquid jet head, and a liquid jet recording apparatus capable of detecting and regulating the pressure of liquid with high accuracy, irrespectively of the kind of the liquid. The pressure damper includes: a main body portion (91) having a concave portion (91a) for storing liquid and a conduit (93, 94) open to the concave portion (91a) formed therein; a thin film (96) which is disposed so as to hermetically seal the concave portion (91a) and which is fixed to the main body portion (91) at a peripheral portion (91c) of the concave portion (91a); a reference member (97) which is freely brought into/out of contact with the thin film (96) and which is disposed in the concave portion (91a); and displacement amount detecting means having a loop coil portion (99) for detecting change in relative position of the reference member (97) with pressure fluctuations of the liquid stored in the concave portion (91a) without contacting the reference member (97).

Abstract: Provided is an ink-jet head and an ink-jet type recording apparatus for improving an impact position accuracy of ink droplets by eliminating a discharge speed difference of ink droplets when an ink volume is changed gradually in a plurality of steps to perform gradation expression. Among discharge pulse signals to be applied a plurality of times for gradually changing and discharging the ink droplet volume, a signal waveform of a final drive pulse and a signal waveform of an initial drive pulse to be operated at least once before the final drive pulse, are varied from each other so as to establish a predetermined relation therebetween.