Abstract: An ink jet printing head comprises a plurality of ink liquid chambers (pressure chambers) 13 connected to an ink supply source and arranged in a predetermined direction and a plurality of nozzles 11a individually connected to the ink liquid chambers 13 and arranged in the predetermined direction. Plate-shaped members 14, 15, 17 and 18 lying between the ink liquid chambers 13 and having a piezoelectric plate member capable of discharging ink in the ink liquid chambers are arranged by being laminated in the arrangement direction of the nozzles 11a. By this configuration, a multi-nozzle ink jet printing head with high-density nozzle arrangement can be realized.

Abstract: In order to ease the discharge of air bubbles stagnated in end portions of a reservoir in an ink jet recording head, the end portions of the reservoir are so formed that the widths thereof are substantially equal to the depths thereof. Air bubbles entered in those portions are drawn into pressure generating chambers by directly applying negative pressure to discharge outwards from nozzle orifices.

Abstract: In an ink jet print head, a fluid passage forming substrate includes pressure generating chambers being trapezoidal in shape, each pressure generating chamber having walls substantially parallel to the flowing direction of ink, and no stagnation of ink is present in the pressure generating chambers. The pressure generating chambers' walls include first walls vertical to the surface of the silicon monocrystalline substrate and oriented in the orientation of the pressure generating chambers, and second walls slanted at an angle of 35° with respect to the surface of the substrate, the second walls being formed at both ends of each pressure generating chamber. An elastic plate is fastened onto first opening-formed sides of the pressure generating chambers and piezoelectric layers for expanding and contracting the pressure generating chambers are mounted on the surface of the elastic plate.

Abstract: A control system for controlling a driving pulse applied to a piezoelectric element of an inkjet head is disclosed. A variable-voltage source produces a control voltage depending on a control signal and a pulse generator generates the driving pulse having a voltage waveform with a slope determined depending on the control voltage. A peak voltage of the driving pulse is monitored and the control signal is adjusted so that the peak voltage reaches a predetermined voltage.

Abstract: In an ink jet recording head, after a plate-shaped piezoelectric element is positioned and fixed onto a fixing plate, the piezoelectric element is sliced into a large number of vibrators and the leading ends of the vibrators are embracingly held in positioning holes 33 respectively formed in a top surface of a holding frame and are thus positioned in the surface direction thereof. Further, a cavity unit is positioned and fixed on the top surface of the holding frame.

Abstract: An ink-jet recording apparatus has an ink-jet head which includes a main head body including ink chambers formed therein, piezoelectric elements for changing a volume of each of the ink chambers in accordance with application of a driving voltage, and an IC chip including a driving circuit for driving the piezoelectric elements. An anisotropic conductive material having adhesive force is applied to a surface of the IC chip formed with chip electrodes, the material is covered with a surface of the main head body formed with head electrodes, and a pressure is applied in an overlapping direction so that electric continuity is established between the both electrodes. The heat generated in the IC chip can be efficiently radiated through the anisotropic conductive material. The IC chip can be prevented from damage which would be otherwise caused by the heat. In place of the anisotropic conductive material, a potting material can be used in combination with a conductive adhesive or solder.

Abstract: An ink-jet printer head is constructed with first electrodes formed on a silicon substrate on which oxidization is performed, and each having a region contacting ink to generate ink bubbles, and a region coated with insulating layers; second electrodes formed on a layer different from the first electrodes' layer, electrically isolated from the first electrodes by the insulating layers, and contacting the ink, and producing ink bubbles in the ink on receipt of electric energy; bubble chamber barriers for electrically isolating the first electrodes from the second electrodes and for constituting bubble chambers in the ink; a nozzle plate having a plurality of orifices through which the ink is sprayed on a print media; ink chamber barriers formed between the second electrodes and the nozzle plate, and leading the ink into the orifices by a steam pressure generated from the bubble chamber barriers; and ink chambers formed by the ink chamber barriers and the bubble chamber barriers, and each temporarily stori

Abstract: A liquid jetting apparatus has a concave casing having an opened flat face, and a piezoelectric drive element for at least partly sealing the opened flat face to form a liquid reservoir to store a liquid, such as ink. The reservoir has a liquid injection port for injecting a liquid and a liquid jet port for jetting the stored liquid. The piezoelectric drive element is directly bonded to the open flat face.

Abstract: An ink jet type recording head of a multi-layer structure including a pressure generating unit and a flow path unit. The pressure generating unit is composed of a ceramic vibrating member with piezoelectric transducers on the surface thereof, a ceramic first spacer member with a plurality of through-holes forming pressure chambers, and a lid member having through-holes through which the pressure chambers are communicated with a reservoir, these members being joined by firing in such a manner that a diaphragm is placed on one surface of the first spacer member, and the lid member is sealingly set on the other surface of the spacer member.

Abstract: An on-demand ink jet head includes a plurality of piezoelectric elements in alignment with one another with one end of each facing in the same direction. The end of each piezoelectric element is bonded by an adhesive material to a diaphragm which, together with a nozzle plate, forms a pressurizing chamber. To confine the fluid state adhesive material expelled out of the endmost piezoelectric elements, a dummy piezoelectric element is disposed outside each endmost piezoelectric element. The adhesive material, when dried, serves as a damper of the piezoelectric element for damping unwanted vibrations of the piezoelectric elements. By the provision of the dummy piezoelectric elements, the distribution of the adhesive material becomes substantially even between the piezoelectric elements, resulting in uniform operations of the piezoelectric elements.

Abstract: A method and apparatus is provided for the generation of agglomerations of particulate material in a liquid. Agglomerations are built up at a point under the effect of an electric field and ejected by electrostatic means. The size of the agglomeration is dependent upon the strength of the electric field, point geometry, the nature of the liquid and the nature of the particles. Agglomerations of particles in the range of from 1 to 500 microns are produced The invention is useful for non-impact printing and other applications where delivery of agglomerations of particles is useful such as in inhalable pharmaceuticals.

Abstract: An ink jet print head includes PZT films formed on a first surface of a single-crystal silicon substrate, ink cavities formed in the regions of the single-crystal silicon substrate which correspond in position to the PZT films, and a nozzle plate formed on a second surface of the single-crystal silicon substrate, which is opposite to the first surface. Each ink cavity is formed using anisotropical wet and dry etching, and wherein a portion of each ink cavity close to the first surface of the single-crystal silicon substrate is anisotropically dry etched.

Abstract: Disclosed is an ink jet printer head actuator and a manufacturing method thereof.

Abstract: The present invention provides a recording apparatus having a detachable automatic sheet supplying apparatus, wherein a projection protruding substantially in a horizontal direction is formed on the recording system or on the automatic sheet supplying apparatus, so that they can stand by themselves; a recess is formed in the automatic sheet supplying appparatus or in the recording system; and the recording system is connected to the automatic sheet supplying apparatus by fitting the projection into the recess.

Abstract: In accordance with the invention a multi-chamber printhead barrier design that is compensated for differences in ink properties is disclosed. The printhead comprises different groups of firing chambers, each group dedicated to a different ink. The barrier design is configured to a particular ink property such as viscosity, in order to provide similar ink refill characteristic for the different groups of firing chambers.

Abstract: An ink jet recording head designed to prevent the displacement characteristic of a piezoelectric vibrator from being varied depending upon the number of simultaneously driven piezoelectric vibrators. The recording head includes a passage unit, a vibrator unit and a connecting member. The passage unit includes a nozzle plate having a nozzle aperture therein, a passage forming plate having a pressure generating chamber and a reservoir, and an elastic plate. The nozzle plate, the passage forming plate and the elastic plate are laminated together. The vibrator unit includes a fixing plate, and a plurality of piezoelectric vibrators fixed at one end portion thereof to the fixing plate at a predetermined pitch and contacting the elastic plate at another end portion thereof. The piezoelectric vibrators are actuated in a longitudinal vibration mode for emitting an ink droplet by deflecting the elastic plate to expand or contract the pressure generating chamber.

Abstract: Techniques for improving stable ink droplet ejecting at high speeds and associated ink jet print heads for use in recording apparatuses. Particularly, residual vibration in the elastic, deformable diaphragms used to expel ink from an individual nozzle are dampened or eliminated by applying a secondary driving signal a preselected period of time after the primary ejection signal has been transmitted. Ideally, this secondary signal is applied just when the vibrating diaphragm most closely approaches a stationary wall normally separated therefrom by a predetermined gap distance, at least when electrostatic action is used to deform the diaphragm. Moreover, the secondary driving signal is smaller in magnitude yet longer in duration in the primary ejection signal to insure an orderly dissipation of diaphragm vibration without ejecting undesired satellite drops.

Abstract: An ink jet recording head includes at least a row of nozzle aperture; a passage formed substrate having partitions forming at least a row of pressure generating chambers, each communicating the respective nozzle aperture; a diaphragm forming a part of the pressure generating chambers and at least an upper surface of which serves as a lower electrode; a piezoelectric vibrator including, a piezoelectric active part having a piezoelectric layer formed on the surface of the diaphragm, and an upper electrode formed on the surface of said piezoelectric layer and formed in an area opposite to said pressure generating chamber; and a backing member joined to the side of the piezoelectric layer and having partitioning walls forming a concave portion being space to extent that a movement of the piezoelectric active part is not prevented, and fixed to the passage formed substrate such that each partitioning wall is opposite to the partition of the passage formed substrate.

Abstract: The present invention relates to an ink jet printer in which drops of ink are jetted out onto a surface of a recording medium so as to record an image. The present invention is to obtain an economical ink jet printer in which a reaction force generated in the reciprocal motion of the ink jet head is simply canceled, and the ink jet printer is small and light, and less vibration is caused in the printer, and further it is possible to drive the printer with a small amount of drive energy.

Abstract: An electrostatic ink-jet recording device which provides stable printing by preventing too much charged toner from gathering around an ink discharge aperture even if the charged toner has not been discharged for a long time. If the charged toner is not to be discharged, the potential difference between the electrophoretic electrode and the discharge electrode is so controlled as to suppress electrophoretic movement of the charged toner toward the ink discharging aperture, or the potential difference is made zero. If the charged toner is to be discharged, the voltage applied to the discharge electrode is kept lower than the voltage applied to the electrophoretic electrode for a predetermined period of time before discharging a jet of the charged toner.