Abstract: A ring-shaped packing is fitted into a annular groove surrounding an aperture through which ink is supplied to a head unit, and a sealant is filled around the packing. By bringing the packing into contact with the surface of a filter covering a supply hole and by pressing the head unit, the sealant makes intimate contact with the head unit while the end of the packing is kept in intimate contact with the filter, thereby sealing the supply hole. Then a frame and the head unit are bonded to each other using an UV adhesive.

Abstract: An inkjet head according to the invention includes a passage unit including a plurality of pressure chambers one end of each of which is connected to a nozzle and the other end of which is to be connected to an ink supply source, and actuator unit for changing the volume of each of the pressure chambers. The actuator unit includes a common electrode maintained at a constant potential, a plurality of individual electrodes arranged at positions corresponding to each pressure chamber, and a plurality of piezoelectric sheets which are sequentially laminated. The piezoelectric sheets most distant from the pressure chamber among the plurality of piezoelectric sheets is sandwiched between the common electrode and at least one of the individual electrodes.

Abstract: An ink-jet head includes a plurality of nozzles that eject ink, a first flat plate layer including at least one flat plate formed with an array of pressure chambers each communicating with a corresponding one of the nozzles, a second flat plate layer including at least one flat plate formed with a common ink chamber having a shape elongated in a direction of the array of the pressure chambers, an ink flow passage that communicates at one end with a corresponding one of the pressure chambers and at the other end with the common ink chamber, an ink supply passage connecting the common ink chamber and an ink supply source, a flat plate member in a shape of a thin film disposed between the first flat plate layer and the second flat plate layer, a filter formed at the flat plate member for filtering the ink, and a damper chamber formed by a flat plate fixed on the flat plate member on a side thereof opposed to the common ink chamber.

Abstract: An ink jet head includes rows of pressure chambers, a common ink chamber, and a circulation channel. Filter holes are provided along a fluid channel connecting the common ink chamber with the pressure chambers. The common ink chamber is formed broader at a region separated from, and with a weaker mechanical stiffness than, the portion that is connected to the pressure chambers. The common ink chamber and the circulation channel are elongated in the direction that the pressure chamber rows extend. The circulation channel and the common ink chamber are in fluid communication with each other at one lengthwise end and both have an opening at the opposite lengthwise end to enable connection to the external ink supply.

Abstract: An actuator 120 is formed from nine piezoelectric sheets stacked in this order to give a laminated configuration. A common electrode 25 is formed on the upper surface of each piezoelectric sheet 122, 121b, 121d, 121f, 121g. A plurality of drive electrodes 24 are formed the upper surface of each piezoelectric sheet 121a, 121c, 121e, 123. The common electrodes 25, a cavity plate 14, and a cover plate 44 are all maintained at the same potential (0V). The lowermost piezoelectric sheet 122 formed with the common electrode 25 is located between the cavity plate 14 and the lowermost drive electrodes 24 on the piezoelectric sheet 121a. In this configuration, an ejection voltage applied to the drive electrodes 24 is reliably prevented from being applied to ink in a pressure chamber and/or the cavity plate 14, whereby reliable ink ejection is possible.

Abstract: A broadcasting receiver for setting beforehand, a threshold of free disk space of a file system on a Hard Disk Drive (HDD), detection of record termination of a specified program investigates the free disk space of the HDD. The present free disk space is compared with the threshold level of free disk space set up beforehand. If the present free disk space is smaller than the threshold level, a message indicating the free disk space has decreased is displayed automatically, and, if necessary, the present free disk space is displayed simultaneously.

Abstract: A method for manufacturing an ink-jet head, including forming a mark for indicating the positions of pressure chambers on a surface of a passage unit; preparing a member containing a piezoelectric sheet on which a common electrode is supported; attaching the member to the surface of the passage unit; and forming individual electrodes, based on the mark, on a face of the member facing the direction opposite to the attached face thereof to the passage unit.

Abstract: An ink-jet head includes a passage unit including a nozzle plate unit having a nozzle plate in which nozzles are formed, and a main unit fixed on the nozzle plate unit in a laminating direction and having a plurality of pressure chambers, each of the plurality of pressure chambers having one end connected with a nozzle and an other end connected with an ink supply source, the plurality of pressure chambers arranged along a plane to neighbor each other, and an actuator unit, fixed on a side of the main unit opposite to a side in which the main unit is fixed on the nozzle plate unit, for changing the volume of each of said pressure chambers.

Abstract: An ink-jet head includes a plurality of nozzles that eject ink, a first flat plate layer including at least one flat plate formed with an array of pressure chambers each communicating with a corresponding one of the nozzles, a second flat plate layer including at least one flat plate formed with a common ink chamber having a shape elongated in a direction of the array of the pressure chambers, an ink flow passage that communicates at one end with a corresponding one of the pressure chambers and at the other end with the common ink chamber, an ink supply passage connecting the common ink chamber and an ink supply source, a flat plate member in a shape of a thin film disposed between the first flat plate layer and the second flat plate layer, a filter formed at the flat plate member for filtering the ink, and a damper chamber formed by a flat plate fixed on the flat plate member on a side thereof opposed to the common ink chamber.

Abstract: An ink-jet head includes a passage unit including a plurality of pressure chambers each connected with a nozzle and arranged in a matrix in a plane to form a plurality of pressure chamber rows in a first direction in the plane, and a plurality of common ink passages each extending along the first direction and communicating with the pressure chambers.

Abstract: An ink-jet head according to the invention includes a passage unit in which a plurality of pressure chambers, each having one end connected with a nozzle for ejecting ink and the other end to be connected with an ink supply source, are arranged along a plane neighboring each other, and an actuator unit arranged at a surface of the passage unit for changing the volume of each of the pressure chambers. Further, the ink-jet head includes a flexible printed circuit having signal lines electrically connected to the actuator unit, each signal line supplying a drive signal for changing the volume of the pressure chamber, a support member for supporting the head unit, and a seal member arranged between support member and the passage unit. Further, the flexible printed circuit is fixed to the support member and the passage unit by the seal member.

Abstract: An ink-jet head includes a plurality of nozzles for ejecting ink, a first flat plate layer formed by aligning a plurality of pressure chambers communicating with the nozzles respectively and including at least one sheet of flat plates, a second flat plate layer formed with a common ink chamber having a shape elongated in a direction of aligning the pressure chambers and comprising at least one sheet of the flat plates, an ink supply passage connecting the common ink chamber and an ink supply source, a flat plate member in a shape of a thin film disposed between the first flat plate layer and the second flat plate layer, a restriction flow passage formed at the flat plate member for communicating one end thereof to the pressure chamber, communicating the other end thereof to the common ink chamber and controlling a flow of ink between the pressure chamber and the common ink chamber, and a damper chamber formed at the flat plate layer facing the flat plate member on a side thereof opposed to the common ink cham

Abstract: A print head for a piezoelectric ink jet printer includes a piezoelectric actuator in the form of a plate, which lies on one side of a metallic cavity plate. The actuator includes drive electrodes and side electrodes. The side electrodes are formed on a side face of the actuator and each connected with one of the drive electrodes. The cavity plate has pressure chambers each aligned with one of the drive electrodes. The cavity plate also has nozzles each communicating with one of the chambers. The cavity plate further has a recess formed on the one side. The side electrodes are aligned with the recess to be kept out of contact with the cavity plate. Another print head for a piezoelectric ink jet printer includes a piezoelectric actuator in the form of a plate, which lies on a cavity plate. The actuator has recesses formed in a side face of it, and includes drive electrodes and side electrodes. Each side electrode is formed in one of the recesses and connected with one of the drive electrodes.

Abstract: An ink-jet head having a passage unit including pressure chambers each having one end coupled to a nozzle and the other end to be coupled to an ink supply source. The pressure chambers are arranged along a plane to neighbor each other. The ink-jet head further includes actuator units attached to a surface of the passage unit for changing the volume of each pressure chamber. Each actuator unit includes pressure generation portions respectively corresponding to pressure chambers, and is formed to extend over the pressure chambers. The actuator units are arranged along the longitudinal direction of the passage unit so that each neighboring actuator units partially overlap each other in the lateral direction of the passage unit. Each actuator unit has a basic region where many pressure generation portions are formed in a matrix, and an additional region neighboring the basic region in the lateral direction of the passage unit.

Abstract: A broadcasting receiver for setting beforehand, a threshold of free disk space of a file system on a Hard Disk Drive (HDD), detection of record termination of a specified program investigates the free disk space of the HDD. The present free disk space is compared with the threshold level of free disk space set up beforehand. If the present free disk space is smaller than the threshold level, a message indicating the free disk space has decreased is displayed automatically, and, if necessary, the present free disk space is displayed simultaneously.

Abstract: An inkjet head employed in an inkjet printing apparatus includes a main body provided with a printing surface, which has a substantially rectangular elongated shape, and a plurality of piezoelectric modules. Each of the piezoelectric modules has a substantially trapezoidal shape, and is provided with a plurality of piezoelectric unit structures. The plurality of piezoelectric modules are arranged along a longitudinal direction of the printing surface such that upper base of the trapezoidal shape is located at a central portion in a direction perpendicular to the longitudinal direction. Further, the plurality of piezoelectric modules are oriented in opposite directions alternately in the direction perpendicular to the longitudinal direction.

Abstract: An inkjet head has a plurality of pressure chambers. An end of each pressure chamber is connected to a discharging nozzle and the other end to an ink supplier. The pressure chamber has a rhombic shape having longer and shorter diagonals. The inkjet head further includes an actuator unit, which has at least one planar piezoelectric layer covering over the plurality of pressure chambers, a common electrode provided on one side surface of one of the at least one planar piezoelectric layer, and a plurality of driving electrodes provided for the pressure chambers, respectively. The plurality of driving electrodes are formed on the other side of the one of the at least one planar piezoelectric layer. Further, conditions: 0.1 mm≦L and 0.29≦&dgr;/&lgr;≦1 are satisfied, where L represents the length of the shorter diagonal and &dgr; represents a length of a driving electrode extending in parallel with the width L.

Abstract: An inkjet head is provided with a plurality of pressure chambers, each of which is configured such that an end thereof is connected to a discharging nozzle and the other end is connected to an ink supplier, and an actuator unit for the plurality of pressure chambers. The actuator unit is formed to be a continuous planar layer including at least one inactive layer arranged on a pressure chamber side and at least one active layer arranged on a side opposite to the pressure chamber side with respect to the inactive layer, the planar layer covering the plurality of pressure chambers. The at least one active layer is sandwiched between a common electrode and a plurality of driving electrodes arranged at positions corresponding to the plurality of pressure chambers. The continuous planar layer includes a plurality of active layers or a plurality of inactive layers.

Abstract: There are provided a lower sensor and an upper sensor mounted respectively on top and bottom surfaces of a sensor unit, an operation unit calculating respective measurements indicating the degree of adhesion of dirt to respective surfaces of a lower mold and an upper mold based on respective detection signals from the lower sensor and the upper sensor, and a comparator unit comparing each measurement from the operation unit with a predetermined reference value to transmit a predetermined warning signal if the measurement is equal to or smaller than the reference value. The warning signal is thus transmitted if reflected radiation that is radiation reflected from the mold surface has its intensity equal to or smaller than the reference value.

Abstract: An actuator 120 is formed from nine piezoelectric sheets stacked in this order to give a laminated configuration. A common electrode 25 is formed on the upper surface of each piezoelectric sheet 122, 121b, 121d, 121f, 121g. A plurality of drive electrodes 24 are formed the upper surface of each piezoelectric sheet 121a, 121c, 121e, 123. The common electrodes 25, a cavity plate 14, and a cover plate 44 are all maintained at the same potential (0V). The lowermost piezoelectric sheet 122 formed with the common electrode 25 is located between the cavity plate 14 and the lowermost drive electrodes 24 on the piezoelectric sheet 121a. In this configuration, an ejection voltage applied to the drive electrodes 24 is reliably prevented from being applied to ink in a pressure chamber and/or the cavity plate 14, whereby reliable ink ejection is possible.