Abstract: A liquid jetting apparatus of the invention includes a pressure chamber having an inside space whose volume is changeable, into which a liquid is supplied and which is communicated with a nozzle. A Helmholtz resonance frequency of the pressure chamber has a period of TH. A signal-generating unit generates a driving signal, which includes a first signal-element for causing the pressure chamber to expand, a second signal-element for causing the pressure chamber to contract from an expanded state thereof in order to jet a drop of the liquid through the nozzle, and and a third signal-element for causing the pressure chamber to expand to an original state before outputting the first signal-element after the drop of the liquid is jetted. A pressure-generating unit causes the pressure chamber to expand and contract, based on the driving signal.

Abstract: An ink jet record head which has rows of pressure generation chambers (1) having nozzle openings (5), common ink reservoirs (2) placed along the row direction of the pressure generation chambers, ink supply passages (3) for communicating the ink reservoirs with the pressure generation chambers to communicate with each other, and piezoelectric vibrators for causing the pressure generation chambers to generate pressure. The opening parts of the ink supply passages in the proximity of each end part of the ink reservoir are arranged closely as compared with the opening parts of the ink supply passages in the proximity of the center of the ink reservoir.

Abstract: Grooves 21 are formed in the side of an ink supply needle 17 opposite a filter 19 in order to induce the movement of ink using capillary attraction, and so that the grooves 21 ensure that ink can flow along a path to a recording head regardless of whether an air bubble is present.

Abstract: A recording head is provided with a pressure chamber communicated with a nozzle orifice. A pressure generating element generates pressure fluctuation in ink contained in the pressure chamber. A drive signal generator generates a drive signal for driving the pressure generating element such that a main ink droplet and a satellite ink droplet accompanied with the main ink droplet are ejected to form an ink dot on a recording medium. The main ink droplet has a first volume, and the satellite ink droplet has a second volume which is larger than the first volume. Alternatively, the main ink droplet is ejected with a first speed, and the satellite ink droplet is ejected a second speed which is faster than the first speed.

Abstract: An ink jet recording head including a flow path unit having pressure generating chambers, a piezoelectric vibrator for pressurizing the pressure generating chambers, a semiconductor integrated circuit for supplying a drive signal to the piezoelectric vibrator, and a member for absorbing the heat produced by the integrated circuit.

Abstract: In a vibrator unit, at least one piezoelectric vibrator is fixed on a base member in a cantilevered manner, such that a first region of the piezoelectric vibrator is fixed on a first face of the base member. A resin case is formed with a housing space extending through a first end face to a second end face thereof. The housing space includes a first housing part which opens to the first end face of the case, a second housing part which continues to the first housing part, and a third housing part which continues to the second housing part. In the first housing part, a part of the piezoelectric vibrator except for the first region is housed.

Abstract: After assembling an ink jet recording head which includes a plurality of nozzle orifices forming at least one nozzle row, pressure chambers each communicated with the associated nozzle orifice, pressure generating elements each generating pressure fluctuation in ink provided in the associated pressure chamber to eject an ink droplet from the associated nozzle orifice, a natural period of the ink pressure fluctuation in the pressure chamber of the assembled recording head is measured. Then the assembled recording head is classified into a plurality of ranks, based on the measured natural period.

Abstract: The present invention provides a liquid crystal display device, each of gate terminals of which has a laminated structure formed of an aluminum alloy thin film and a molybdenum alloy thin film stacked on the aluminum alloy thin film, and forms respective gate lines by converting the molybdenum alloy thin film of the laminated structure into an aluminum oxide thin film in a effective displaying area of the liquid crystal display device. According to the present invention, any displaying errors of the liquid crystal display device caused by deterioration of insulation between wiring patterns formed therein (like the gate lines) during manufacturing processes thereof will be avoided without adding any fabrication steps to the manufacturing processes thereof.

Abstract: A drive signal COM1 or COM2 generated by a drive signal generator includes: a drive pulse DP1 or DP3 whose bias level is adjusted to a middle voltage Vm; a drive pulse DP2 whose bias level is adjusted to a ground voltage GND; a ready signal DP0, which includes a first correction element P0 for dropping the voltage from the middle voltage Vm to the ground voltage GND; and a recovery signal DP4, which includes a second correction element P14 for raising the voltage from the ground voltage GND to the middle voltage Vm. The ready signal DP0 precedes the drive pulse DP2, and the recovery signal DP4 follows the drive pulse DP2.

Abstract: An ink jet recording apparatus in which a nozzle ink jet recording head provided with a nozzle plate provided with apertures for jetting an ink droplet and a capping device provided with a cap unit for sealing the apertures of the nozzle plate when the recording apparatus is not used are mounted, in which in the cap unit of the capping device, in a sealed state, an ink suction port for supplying negative pressure for exhausting ink from a nozzle aperture if necessary is arranged at the bottom and an atmospheric air open port for releasing negative pressure is arranged on one side and in which a porous plate provided with plural through holes for adjusting the distribution of pressure in the longitudinal direction of the cap unit is housed between the inner bottom face and the upper open face of the cap unit and further, an ink suction method of a recording head are provided.

Abstract: An ink jet recording head of the type in which a passage unit is formed as a layer structure made up of a passage forming plate and an elastic plate. The elastic plate is formed with a thick portion and a thin film portion. The thick portion bonded to the common ink chamber is used as a beam structure deformable toward the common ink chamber. The beam structure is deformed to create a flexure in a thin film sealing the common ink chamber.

Abstract: A passage forming plate (1) is provided with a plurality of pressure chambers (5). A nozzle plate (2) is provided with nozzle holes (6). The nozzle plate (2) is disposed on the front surface (1a) of the passage forming plate (1) so that the nozzle holes (6) communicate with the pressure chambers (5), respectively. Pressure is applied to the ink in the pressure chambers (5) by piezoelectric vibrators (8). A casing member (3) with an ink reservoir (10) for containing the ink to be supplied to the pressure chambers (5) is disposed on the side of the back surface (1b) of the passage forming plate (1). A sealing plate (4) is held between the passage forming plate (1) and the casing member (3). The sealing plate (4) is provided with a plurality of through holes (18) communicating with the plurality of pressure chambers (5), respectively.

Abstract: An ink jet recording apparatus in which a nozzle ink jet recording head provided with a nozzle plate provided with apertures for jetting an ink droplet and a capping device provided with a cap unit for sealing the apertures of the nozzle plate when the recording apparatus is not used are mounted, in which in the cap unit of the capping device, in a sealed state, an ink suction port for supplying negative pressure for exhausting ink from a nozzle aperture if necessary is arranged at the bottom and an atmospheric air open port for releasing negative pressure is arranged on one side and in which a porous plate provided with plural through holes for adjusting the distribution of pressure in the longitudinal direction of the cap unit is housed between the inner bottom face and the upper open face of the cap unit and further, an ink suction method of a recording head are provided.

Abstract: An ink jet record head which has rows of pressure generation chambers (1) having nozzle openings (5), common ink reservoirs (2) placed along the row direction of the pressure generation chambers, ink supply passages (3) for communicating the ink reservoirs with the pressure generation chambers to communicate with each other, and piezoelectric vibrators for causing the pressure generation chambers to generate pressure. The opening parts of the ink supply passages in the proximity of each end part of the ink reservoir are arranged closely as compared with the opening parts of the ink supply passages in the proximity of the center of the ink reservoir.

Abstract: An ink jet recording apparatus is operated under a basic recording mode for recording through use of a basic unit pixel which is associated with a unit recording area corresponding to a unit print cycle, and a high-resolution recording mode for recording through use of a fine unit pixel, a plurality of fine unit pixels being arranged within the unit recording area in a main scanning direction of the recording head. The print data is developed into the jetting data such that each bit therein indicates whether the recording is conducted or not in each associated fine unit pixel, when the high-resolution recording mode is selected.

Abstract: A liquid jetting apparatus of the invention includes a pressure chamber having an inside space whose volume is changeable, into which a liquid is supplied and which is communicated with a nozzle. A Helmholtz resonance frequency of the pressure chamber has a period of TH. A signal-generating unit generates a driving signal, which includes a first signal-element for causing the pressure chamber to expand, a second signal-element for causing the pressure chamber to contract from an expanded state thereof in order to jet a drop of the liquid through the nozzle, and and a third signal-element for causing the pressure chamber to expand to an original state before outputting the first signal-element after the drop of the liquid is jetted. A pressure-generating unit causes the pressure chamber to expand and contract, based on the driving signal.

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: A porous material is used to fill a portion of an ink supply path extending from a needle tip to a filter. Ink is conveyed across the porous material to the filter and wets the entire top surface of the filter. The porous material reduces the substantial cross sectional area of the bubbles that pass therethrough so that the bubbles are then permitted to pass through the filter. Because the bubbles pass through the filter, the stagnation of bubbles on a filter at the end of an ink supply needle is prevented.

Abstract: A spinning apparatus having a nozzle n1 that applies a rotating air current to fibers f and a hollow spindle s1, wherein a fiber introduction member E with a fiber guide surface e8 having a torsion angle of 100.degree. or more is disposed, without a needle shaped guide member e2, near the tip s1" of the fiber introduction side of the hollow spindle. Since the torsion angle of a fiber guide surface of the fiber introduction member is 100.degree. or more, fibers can be bundled easily without the needle shaped guide member and leaves and other foreign matter contained in a sliver are prevented from accumulating between the fiber introduction member and the hollow spindle, thereby reducing the frequency of yarn breakage and improving the spinning capability.

Abstract: A structure for an ink jet head comprising: an ink passage adapted to be supplied with ink; a nozzle communicating with the ink passage and positioned to have exit deep from the end face of the ink jet head; a hollow portion formed in the head end face to communicate with the nozzle exit and to have a larger diameter than the nozzle; and ink ejecting means disposed to correspond to the ink passage and energized electrically to eject the ink in the ink passage out of the nozzle end face through the hollow portion. As a result, the ink droplets can always be ejected in a correct direction by suppressing the fluctuation of their flowing direction, which might otherwise be caused by the breakage in the periphery of the opening in the head end face or by the ooze of the ink. Thus, the ejection characteristics are uniformed by absorbing the errors due to the cutting or grinding step.