Abstract: Provided is a method of manufacturing a liquid jet head (1), the method including: a laminated substrate forming step (S1) of forming a laminated substrate (4) by bonding a plurality of piezoelectric substrates (2), which are made of a high dielectric material and have side surfaces joined to each other, onto a base substrate (3) made of a low dielectric material; a groove forming step (S3) of forming, in a top surface of the laminated substrate (4), a plurality of grooves (7) having a depth reaching to the base substrate (3) and arranged in parallel to a longitudinal direction of the joined side surfaces of the plurality of piezoelectric substrates (2), and removing the joined side surfaces when the plurality of grooves (7) are formed; and an electrode forming step (S4) of forming drive electrodes (13) on side surfaces of the plurality of grooves (7).

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 method includes a stacked substrate forming step (S1) of bonding a piezoelectric substrate (3) onto a first base substrate (2), a groove forming step (S2) of alternately forming ejection grooves (5) and a dummy grooves (6) in parallel with one another, the ejection grooves and the dummy grooves having a depth to pierce the piezoelectric substrate and to reach the first base substrate, an electrode material depositing step (S3) of depositing a electrode material (8) on inner surfaces of the ejection grooves and a dummy grooves (6), a cover plate bonding step (S4) of bonding a cover plate (9), a first base substrate removing step (S5) of removing a part of the first base substrate and removing the electrode material, and a second base substrate bonding step (S6) of bonding a second base substrate (10) to the first base substrate to close openings of the dummy grooves.

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 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 (1) includes: a channel (CA) surrounded by wall members at least partially formed of a piezoelectric body (PM) that is subjected to polarization processing in one direction; a pair of electrodes (EL) sandwiching the piezoelectric body (PM), for applying an electric field in a direction substantially orthogonal to the one direction; and a drive section (CR) for driving the piezoelectric body (PM) by setting a voltage of one of the pair of electrodes (EL) to a low voltage (Vu) having a small absolute value, and supplying a drive signal (Vs) to another one of the pair of electrodes (EL). The drive section (CR) includes a switching element (SW) for switching the voltage of the one of the pair of electrodes (EL) from the low voltage (Vu) to a high voltage (Vh) having a large absolute value.

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: The liquid jet head (1) includes a base (2) having a plurality of pressure chambers (4) which include recesses (3), respectively, the pressure chambers being arranged in a front surface of the base in a predetermined direction, a piezoelectric substrate (5) which is joined to upper surfaces of the side walls (10) of the recesses. The piezoelectric substrate is uniformly polarized in a direction in parallel to a substrate surface of the piezoelectric substrate, and a pair of a front surface drive electrode (9a) and a back surface drive electrode (9b) 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, sandwich the piezoelectric substrate there between and extend to a side wall (10) of the recess substantially from a center of the open end.

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: To solve a problem in that it is difficult to form drive electrodes (11), which are formed respectively on side surfaces of each of partition walls (7), each of the partition walls (7) in a drive region (DR) is made of a piezoelectric material (10) on a top surface side situated above substantially half a height from a bottom surface (12) of each groove (6) to a top surface (13) of each of the partition walls (7), and made of a low-permittivity material (9), which is lower in permittivity than the piezoelectric material (10), on a bottom surface (12) side situated below substantially half the height. Thus, deformation drive amounts of the respective partition walls (7) are equalized, variations in liquid droplet discharge rate among the channels are reduced, and a drive signal is prevented from leaking to the adjacent partition walls (7) and fluctuating the liquid droplet discharge characteristics.

Abstract: To increase yields of a connection process, the following structure is employed in which first electrode terminals (10a) and second electrode terminals (10b) corresponding to discharge channels (C) are arranged on a surface (15) of the actuator substrate (2) in the vicinity of a rear end (RE) thereof, and a common wiring electrode (11a) formed on the flexible substrate (3) is connected in common to the first electrode terminals (10a) corresponding to the discharge channels (C), while individual wiring electrodes (11b) formed on the flexible substrate (3) are individually connected to the second electrode terminals (10b) corresponding to the discharge channels (C) so as to be electrically independent of one another. As a result, the number of wiring electrodes (11) on the flexible substrate (3) is reduced as compared to the number of electrode terminals (10) on the actuator substrate (2).

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.

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: To prevent an adhesive from flowing into nozzles, there is provided a head chip includes: a plate having a plurality of grooves; a cover plate having an introduction aperture; a nozzle plate fixed to an end surface of the plate, and has nozzles formed at the same intervals; and escape holes formed between the nozzle plate and the plate, each have a contour which surrounds a periphery of each of the nozzles with the contour being spaced apart from a contour of each of the nozzles by at least a given distance, accumulate the adhesive remaining at a time of fixing the nozzle plate therein, and allow the nozzles and the grooves to communicate with each other. The nozzles and the escape holes are so arranged as to be displaced from adjacent nozzles and adjacent escape holes by a given distance in a vertical direction of the nozzle plate.

Abstract: An inkjet head chip has an actuator plate, discharge channels formed in the actuator plate for discharging ink, and non-discharge channels arranged alternately in parallel with the discharge channels and which are not configured to discharge ink. The actuator plate has a piezoelectric layer and a low-permittivity substrate layer. The piezoelectric layer is formed of a piezoelectric material and the low-permittivity substrate layer is formed of an insulating low-permittivity material having a lower permittivity than that of the piezoelectric material. One end of each discharge channel extends to an end surface of the actuator plate in a state in which the insulating low-permittivity material is exposed on a bottom surface thereof, and another end of each discharge channel does not extend to the end surface of the actuator plate.

Abstract: Provided is a liquid jet head (1) capable of reducing stagnation of a liquid in grooves (5) formed in a piezoelectric plate (4). The head has that a nozzle plate (2), the piezoelectric plate (4) joined onto the nozzle plate (2), and a cover plate (8) including a liquid supply hole (9) and a liquid discharge hole (10) are laminated. The grooves (5) include deep groove (5a) and shallow groove (5b). The deep groove (5a) has a cross-section which has a convex shape in a depth direction. The deep groove (5a) and a nozzle (3) are communicated at a tip of the convex shape; and the cover plate closes opening portions of the shallow grooves (5b) opened to one surface of the piezoelectric plate, to thereby cause the deep groove (5a) to be communicated to the liquid supply hole and the liquid discharge hole.

Abstract: Provided is a liquid jet head (1) capable of reducing stagnation of a liquid in grooves (5) formed in the piezoelectric plate (4) and of quickly discharging foreign matters entered and mixed into the elongated grooves (5). The liquid jet head (1) has a structure in which a nozzle plate (2) including a nozzle (3), a piezoelectric plate (4) for joining the nozzle plate (2), and a cover plate (8) including a liquid supply hole (9) for supplying the liquid and a liquid discharge hole (10) for discharging the liquid are stacked. The elongated groove (5) has a cross-section having a convex shape in the depth direction. The elongated groove is communicated, at a tip of the convex shape, to the nozzle (3). The elongated groove is communicated, in a bottom portion of the convex shape, to the liquid supply hole (9) and the liquid discharge hole (10).

Abstract: An inkjet head chip has an ink chamber containing ink, channels separated by piezoelectric elements and disposed parallel to each other along a width direction of the inkjet head chip, and a nozzle hole for discharging an ink droplet. The channels include a discharge channel disposed in a middle portion of the parallely disposed channels and communicating with the ink chamber and nozzle hole, dummy channels disposed outside of the discharge channel at respective ends thereof, and non-discharge channels toward the recording medium and supply of the ink from the ink chamber to the dummy channels is interrupted. The discharge of an ink droplet from the non-discharge channels toward the recording medium and the supply of ink from the ink chamber to the non-discharge channels are interrupted.

Abstract: An inkjet head has a first substrate having first groove portions formed on one surface of the first substrate and an ink supply path connected to the first groove portions and opening toward another surface of the first substrate. A second substrate has second groove portions and is connected to the first substrate so that the first and second groove portions jointly form ink chambers. First drive electrodes are formed on sidewalls of the first groove portions. Second drive electrodes are formed on sidewalls of the second groove portions. Conduction members are formed only adjacent to the ink supply path of the first substrate and electrically connect the respective first and second drive electrodes to one another.

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.