Abstract: A liquid ejection printing apparatus quickly perform preliminary ejection with certainty. The liquid ejection printing apparatus ejects droplets of a liquid printing material through a printing head to a medium to be printed for depositing the printing material to perform printing. The liquid ejection printing apparatus performs preliminary ejection upon the onset of power supply and/or prior to initiation of printing while varying a drive frequency of the printing head during the preliminary ejection.

Abstract: An actuator unit for an ink jet print head in which pressure generating chambers 30 and 31 are arranged in two linear arrays with a pitch P1 between the chambers in each linear array. The pressure generating chambers in one linear array are shifted by an amount equal to 1/4 of P1 with respect to the pressure generating chambers in the other linear array. A plurality of actuator units may be connected to a single flow path unit of the ink jet print head, and the nozzle openings in one actuator unit may be shifted by 1/2 of P1 with respect to the nozzle openings in another actuator unit, or they may be aligned. Various arrangements of the nozzle openings, the pressure generating chambers, and the actuator units can be employed to vary the resolution and to print different colors.

Abstract: An ink jet printhead is provided which includes a head body. The head body includes a passage forming panel formed with a plurality of grooved ink passages each communicating with a discharge port, and a vibration plate laminated on the passage forming panel to face the ink passages. The vibration plate is provided with a plurality of ink inlet ports for introducing ink into the ink passages. Therefore, an ink cartridge may be connected from behind the head body.

Abstract: An ink-jet printing head comprises: a pressurizing chamber substrate having first and second sides opposing each other; a plurality of pressurizing chambers formed on the first side of the pressurizing chamber substrate; channels formed on the second side of the pressuring chamber substrate to be opposite to the pressuring chambers, respectively; oscillating plate films for pressurizing ink within the respective pressurizing chambers; and piezoelectric thin-film elements, each having upper and lower electrodes and a piezoelectric film sandwiched between the upper and lower electrodes, the piezoelectric thin-film being formed in the channel, wherein at least the upper electrode is formed to have a narrower width than that of the pressurizing chamber. And a method for producing the ink-jet head.

Abstract: A method of depositing material on a surface (136) is described in which a bulk medium (for example ink 122) in the form of a composition of dispersed insoluble material (for example ink particles) and a support medium is supplied to a cell (120). A movement of the insoluble material within the bulk medium is effected towards a transfer aperture (128) within the cell, thereby concentrating the insoluble material within the bulk medium. Thereafter the insoluble material is removed from the concentration within the bulk medium through the aperture (128) and deposited onto the surface (136).

Abstract: A piezoelectric type ink-jet printing head including a pressure chamber plate having a plurality of pressure chambers and a plurality of ink supply ports for supplying ink into the respective pressure chambers, a nozzle plate having a plurality of nozzles and a piezoelectric element having a surface, at least parts thereof defining a plurality of displacement portion. The nozzle plate is attached to one of the surfaces of the pressure chamber plate, in such a manner that the respective nozzles are connected to the respective pressure chambers. The other surface of the pressure chamber plate is attached to the piezoelectric element, in such a manner that each of the displacement portions of the piezoelectric element defines at least one of walls of each of the pressure chambers.

Abstract: A printhead structure (106) for use in a DEP (Direct Electrostatic Printing) is provided, made from an insulating material comprising a control electrode in combination with printing apertures (107) and being installed between a toner delivery means (101) and a image receiving substrate (109), characterised in that the printhead structure comprises:(i) one individual control electrode (106a) around each aperture (107) on one side of the insulating material (106d) of the printhead structure,(ii) one individual shield electrode (106b) around each aperture (107) on the other side of the insulating material (106d) of the printhead structure, wherein each single electrode of the individual control electrodes (106a) and each single electrode of the individual shield electrodes (106b) arranged around each aperture (107) are connected to each other via metallisation (106c) through the single aperture (107), forming a single printing electrode around each aperture (107).

Abstract: An image forming apparatus includes reading means for reading the density of a test pattern corresponding to each of plural recording elements of a recording head, the recording elements being arranged in an array, and the test pattern being recorded by the recording elements. An eliminating means eliminates error information, recorded from an area outside a test pattern are, from density information obtained by the reading means when the density of a test pattern end portion corresponding to an end portion of the array of plural of recording elements is determined. A means is provided for uniforming the image densities in correspondence with the plurality of recording elements based on density information from which the error information is eliminated by the eliminating means.

Abstract: An improved ink jet head is provided. This improved ink jet head comprises a diaphragm, which is part of an ink chamber. The diaphragm includes a segment which contacts an opposing wall by a drive voltage lower than that for the rest of the diaphragm. The ink jet head also comprises an opposing wall opposite to the diaphragm. When the pressure for ink droplet ejection is generated, the segment of the diaphragm contacts the opposing wall, creating an extremely low compliance state. After ink droplet ejection, the segment of the diaphragm separates from the opposing wall, producing a high compliance state that absorbs the pressure created in the ink chamber by oscillation in the ink channel. Thus, pressure in the ink chamber resulting from ink vibration in the ink path including the ink chamber is buffered to prevent satellite emissions.

Abstract: An inkjet recording apparatus which discharges ink onto a recording medium in response to an image signal. The above inkjet recording apparatus has an ink accommodating portion which has a plurality of ink chambers each of which accommodates ink therein and is integrally formed, thereby the ink pressurization characteristics between the ink chambers is uniform.

Abstract: An ink jet print head is constructed from first and second actuator plates 102 and 103. Side walls 111 and 116 made from piezoelectric material are connected to each other. An ink chambers 112 filled with ink 181 is formed between two adjacent side walls each constructed from the side walls 111 and 116. The actuator plates 102 and 103 can be produced so that the length of the side walls 111 be different from the length of the side walls 116 so long as the ratio between those values does not exceed an upper limit of 3 or a lower limit of 1/3. The actuator plates 102 and 103 can be produced so that the width of the side walls 111 be different from the width of the side walls 116 so long as the ratio between those values does not exceed an upper limit of 2 or a lower limit of 1/2.

Abstract: A high reliability ink jet head for an ink jet recording apparatus enabling consistent ink ejecting with no nozzle clogging. The ink jet head therefor comprises a substrate comprising plural ink passages, each comprising a nozzle, pressure generator continuous to the nozzle, and an orifice, and an ink supply member common to the plural ink passages. The substrate comprising an anisotropic crystalline material such as silicon, and a filter channel formed integrally to the ink supply member by anisotropic etching.

Abstract: An ink jet printing head which both realizes a higher density and prevents a failure in ink jetting and deterioration in the printing quality. A photosensitive glass substrate which allows anisotropic etching is provided with a multiplicity of individual ink passages each having a narrow width and a large depth formed in an array by anisotropic etching in such a manner that each extends from the rear end of the glass substrate to the forward end thereof. A diaphragm is attached to the surface of the glass plate on which the individual ink passages are formed in such a manner as to cover all the individual ink passages. A common electrode is provided on the diaphragm, and individual piezoelectric elements are fixed to the common electrode at the portions corresponding to the individual ink passages. Individual electrodes are provided on the respective individual piezoelectric elements.

Abstract: An image forming device of the type using an aperture electrode assembly in which toner passage through apertures formed is controlled in accordance with a drive signal and the toner particles selectively pass through the apertures to form an image on a recording medium. The aperture electrode assembly includes an electrical insulation sheet and a plurality of control electrodes formed thereon. Wrinkles are prevented from occurring in the insulation sheet when the electrode assembly is secured to a frame or the wrinkles, even if generated resulting from mounting of driver IC chips on the insulation sheet, do not spread to the vicinity of the apertures.

Abstract: An ink-jet head is provided with a container having an ink-discharge opening in its wall section; a structural element that has peripheral edges at least both ends in one direction of which are secured to the wall faces inside the container, that divides the inside of the container in a fluid-separated state, and that is allowed to be distorted; and a voltage-applying unit for applying a voltage to the structural element. The structural element is constituted of a piezoelectric material, and the shape of the structural element is changed in response to the voltage applied by the voltage-applying unit so that ink is allowed to discharge from the ink-discharge opening. Therefore, the above-mentioned arrangement makes it possible to provide a greater ink-discharging force and ink-discharging speed, while maintaining a small size of the head. Moreover, it is possible to provide an ink-jet head having a good discharging efficiency with long service life.

Abstract: An electrostatic ink jet according to the present invention includes a head body having an ink chamber for holding ink liquid containing charged particulate material; an ejection port provided at one end of that head body and connecting to the ink chamber; an ejection electrode arranged near this ejection port and fed with an ejection voltage of the same polarity as the charge characteristic of the charged particulate material; a counter electrode arranged opposite to the ejection port via a recording medium; and a pair of stirring electrodes. The stirring electrodes are arranged in the direction reverse to that of gravity in the ink chamber. The stirring electrodes are fed with a stirring voltage for shifting the charge particulate material in the direction reverse to the direction of gravity, and that stirring voltage is generated before the generation of the ejection voltage.

Abstract: An ink jet print head is provided with high integration in which a substrate formed with a wiring pattern of a driver circuit is adhered to an actuator plate to provide a joined body, which is formed with a number of channels serving as ink chambers. An actuator is formed between the channels, and conductive films serving as driving electrodes are formed over the substrate and the actuator plate at a part of side walls of the channels by electrically connecting to a wiring pattern by an oblique vapor deposition method and an electrolytic plating method. Accordingly, voltage can be directly applied to the driving electrodes from the driver circuit.

Abstract: A DEP device is provided that comprises a back electrode (105), a printhead structure (106), an array of printing apertures (107) in the printhead structure (106) through which a particle flow can be electrically modulated by a control electrode (106a), a toner delivery means (101), presenting a cloud (100) of dry toner particles in the vicinity of the apertures (107), characterized in that the toner cloud (100) is formed in the vicinity of the apertures (107) by means of a gas stream. The toner cloud is formed by detaching toner particles from a charged toner conveyer by the gas stream, or by forming a fluidized bed of toner particles.

Abstract: A printhead structure and a method are used in direct electrostatic printing wherein streams of charged toner particles from a source of toner particles are directed onto an image carrier, such as a sheet of paper. A first set of print electrodes surround apertures through which the streams of toner particles flow. Voltages are selectively applied to the print electrodes to control the flow of toner particles through the respective apertures. A set of deflection electrodes are also associated with the apertures. Deflection voltages from at least one deflection voltage source are applied to the deflection electrodes to increase the convergence of the toner particles onto the information carrier and also to control the trajectories of the toner particles onto predetermined dot locations on the information carrier so that each aperture may provide toner particles to multiple lateral locations on the information carrier.

Abstract: To provide a recording apparatus that is capable of recording high quality images free from density unevenness, a recording electrode used in the recording apparatus is formed from an electrically insulating base film formed with a plurality of apertures, and control electrodes formed on the front surface of the base film to surround each of the plurality of apertures. To obtain the base film which is not likely to be scratched or wrinkled, a product of the modulus of elasticity of the base film and the thickness thereof to the third power needs to be more than 0.008 kg.multidot.mm.