Abstract: This disclosure relates to a printing device for printing or dispensing a curable printing composition which is capable of changing color in response to the application of a magnetic field in the non-cured state. The printing device may be a handheld device such as a portable pen. The present disclosure further relates to curable compositions, cartridges and methods which may be used in combination with the aforementioned printing devices or in other applications.

Abstract: The present invention relates to a microfluidic chip for measuring the magnetic susceptibility of a superparamagnetic nanoparticle droplet and a method for measuring magnetic susceptibility using the same. According to the invention, the magnetic susceptibility of a superparamagnetic nanoparticle can be continuously and accurately measured in a flowing fluid using a microfluidic chip including microfluidic channels.

Abstract: Magnetorheological (MR) antibubbles are used for fluid delivery. A method of transporting a substance in a fluid in accordance with the invention comprising the steps of forming an antibubble in the fluid, the antibubble containing the substance to be transported and magnetic or magnetizable particles, and guiding the antibubble through the fluid with a magnet. The particles are ferromagnetic, paramagnetic or diamagnetic, and the magnet is a permanent magnet or an electromagnet. The substance to be transported may include a reactant associated with a catalytic mechanism; a pigment; or a lubricant. The delivery system may include a substance or magnetic particles which are fluorescent.

Abstract: A nozzle unit for a printer that includes a sleeve having a guide path formed in the sleeve and through which ink passes, a nozzle hole seat arranged at one end of the sleeve and having a nozzle hole corresponding to the guide path, and a nozzle holder accommodating the sleeve and the nozzle hole seat, having an opening whose diameter is larger than a diameter of the nozzle hole of the nozzle hole seat so that the ink passing through the nozzle hole is externally discharged through the opening, and including a paramagnetic material.

Abstract: A printer includes a nozzle hole plate including a plurality of nozzle holes, the nozzle hole plate being rotatable; and a nozzle part including a sleeve having a leading passage corresponding to one of the plurality of nozzle holes of the nozzle hole plate.

Abstract: A method of printing with a magnetic ink includes ejecting a plurality of magnetic ink drops onto a print medium in a print zone and applying a magnetic field to the ink drops on the print medium. The magnetic field increases a viscosity of the magnetic ink drops and reduces or eliminates absorption of the magnetic ink into a porous print medium such as paper.

Abstract: In one embodiment, a hammer bank for a line printer includes a back plate having a front surface, a back surface and a uniform thickness between the front and back surfaces. At least one hammer is disposed in front of the back plate. The at least one hammer is spring-biased for forward movement and away from the back plate and is releasably retained against such forward movement by a magnetic force acting rearwardly thereon. An elongated pole piece that is associated with the at least one hammer extends forwardly from the front surface of the back plate and is selectively operable to interrupt the magnetic force acting thereon.

Abstract: A method of printing with a magnetic ink includes ejecting a plurality of magnetic ink drops onto a print medium in a print zone and applying a magnetic field to the ink drops on the print medium. The magnetic field increases a viscosity of the magnetic ink drops and reduces or eliminates absorption of the magnetic ink into a porous print medium such as paper.

Abstract: A system that incorporates teachings of the present disclosure may include, for example, a method for applying a force to at least one of an inner stream, an outer stream or both of a combined stream to produce a plurality of capsules, receiving image data, processing the image data, detecting undesirable capsules from the processed image data, applying a bias charge only to the detected undesirable capsules, and segregating the biased undesirable capsules from the unbiased desirable capsules. Additional embodiments are disclosed.

Abstract: In one embodiment, a hammer bank for a line printer includes a back plate and a plurality of elongated pole pieces extending forwardly from a front surface thereof. Each of the pole pieces has an electrical coil disposed about a circumfery thereof. A permanent magnet has a back surface coupled to the front surface of the back plate, and a shunt fret defining a plurality of elongated, downwardly extending shunts has a back surface coupled to a font surface of the permanent magnet. A hammer fret defining a plurality of elongated, upwardly extending hammers has a back surface coupled to the front surface of the back plate. Each of the hammers is interdigitated between a pair of adjacent shunts. Each hammer includes an elongated spring portion having a hammer head disposed at an upper end thereof, and each hammer head has a forwardly projecting printing tip thereon.

Abstract: An apparatus for printing a biomolecular droplet onto a substrate using an electric charge concentration effect includes; an electric field forming electrode including an accommodating area in which the biomolecular droplet including micro magnetic beads is accommodated and a nozzle formed on an end of the accommodating area through which the biomolecular droplet is discharged, a substrate disposed below the electric field forming electrode, including a grounded target surface onto which the biomolecular droplet discharged from the nozzle of the electric field forming electrode is deposited, a magnet disposed below the substrate which applies a magnetic force on the micro magnetic beads, and an open circuit type voltage applying unit electrically connected to the electric field forming electrode which applies a charge to the electric field forming electrode which generates an electrical force which causes the biomolecular droplet to be ejected onto the target surface of the substrate.

Abstract: Disclosed is a system for printing an image comprising a plurality of pixels, the system comprising: a carriage arranged to make a plurality of passes along a scanning axis with respect to a print medium; a plurality of printheads mounted on the carriage, each printhead corresponding to a different ink color and comprising at least one ejection nozzle; and, a print controller configured to receive data defining for each pass zero or more locations at which to deposit each of the ink colors to produce each pixel; wherein the data is such that for at least one pixel, at least one of the ink colors is deposited at substantially more locations on one pass relative to the other passes.

Abstract: A droplet ejection device includes a pressure chamber that includes a cavity surrounded by a side wall and a bottom wall, a deformable substrate that is provided above the pressure chamber to cover the cavity and that is parallel to the bottom wall, a magnetic body having an opening that is provided above the deformable substrate and that is fixed to the deformable substrate, and a coil that is disposed above the deformable substrate, that surrounds the magnetic body, and that is fixed to a fixing portion provided above the side wall.

Abstract: A liquid ejecting head includes a substrate, a nozzle forming member for forming on a principal surface of the substrate a nozzle comprising a flow passage of liquid and an orifice for ejecting the liquid, and a dummy pattern. The dummy pattern has substantially the same dimension as at least a part of the nozzle and is formed so that a cross-section of the dummy pattern is exposed at an end surface of the nozzle forming member.

Abstract: A droplet discharge head including a nozzle substrate having nozzle openings, a cavity substrate having discharge chambers that communicate with the nozzle openings and discharge droplets from the nozzle openings, a reservoir substrate having a reservoir concave portion that serves as a reservoir which communicates commonly with the discharge chambers. The reservoir substrate is provided between the nozzle substrate and the cavity substrate and a resin thin film is formed on a whole inner face of the reservoir concave portion and on a bottom face of a second concave portion. The second concave portion is provided in a peripheral of the reservoir concave portion and has a depth which is smaller than the depth of the reservoir concave portion. The resin thin film is cut circularly so as to surround the reservoir concave portion, and a part of the resin thin film serves as a diaphragm buffering pressure variation. serves as a diaphragm buffering pressure variation.

Abstract: Disclosed are an ink-jet head and a manufacturing method thereof. The ink-jet head, which has a reservoir storing ink, a chamber being supplied with the ink from the reservoir, a restrictor connecting the reservoir to the chamber, and a nozzle discharging the ink, includes: a chamber plate, in which the chamber is formed; a vibration plate, which is laminated on an upper surface of the chamber plate to cover the chamber and in which a first coil is placed; a first middle plate, which is laminated on a lower surface of the chamber plate and in which the restrictor is formed, and a second coil is placed; and a lower plate part, which is laminated on a lower surface of the first middle plate and in which the reservoir and the nozzle are formed.

Abstract: The invention provides for a printhead integrated circuit for an inkjet printer. The printhead integrated circuit includes a wafer substrate defining a nozzle outlet port. The printhead integrated circuit also includes an electromagnetic piston inside the chamber, the piston mounted to the wafer substrate via torsion springs, said piston operatively forced towards the outlet port when activated. Also included is a solenoid coil positioned on the wafer substrate about the piston to activate the piston when a current is passed through the coil.

Abstract: An inkjet drop ejection apparatus includes a chamber defined by a plunger spaced from an ejection nozzle; and an actuator for moving the plunger towards the nozzle, the actuator including a magnetic plate and a solenoid coil provided circumferentially between the magnetic plate and the plunger, the solenoid coil for inducing a magnetic field in at least one of the magnetic plate and the plunger. The plunger has defined therethrough a series of apertures arranged around a circumference of the plunger, the apertures substantially mapping a locus of the solenoid coil.

Abstract: A circuit line forming device, including an inkjet head to eject a conductive ink onto one side of a substrate, the conductive ink containing nanoparticles including a ferromagnetic core and a conductive layer surrounding the ferromagnetic core; and a magnetic field generator part, positioned on the other side of the substrate in correspondence with the inkjet head, wherein the magnetic field generator part applies a magnetic field on the conductive ink, when the conductive ink is ejected to form circuit lines.

Abstract: A scalable expandable spray ink printer machine for use with paper roll stock is disclosed. A series of three or four print heads are place serially in proximity to paper stock. The configuration of the cylindrical print head allows the heads to be expanded for printing on wider paper stock. The print heads include a combination of fixed, turning and sliding components to align or block ink flow from the print ink reservoir. The printer is in fixed position perpendicular to the travel direction and rotates internally on an axis parallel to the paper or media to be printed. The print head is sectional and lengthwise expandable in fixed unit lengths. The printing machine is ideally suited for advertising or other elongated print media. Due to the use of standard paper, roll stock and speed of the printing, signs can be printed on demand and displayed in real-time.

Abstract: A printhead that has an array of ink ejection nozzles, an array of chambers adapted to store ink for ejection through each of the nozzles respectively, a silicon substrate for supporting the array of chambers and defining a plurality of ink inlet channels for feeding ink to the array of chambers, the silicon substrate having a planar structure with one surface that supports the chambers and an opposing surface from which the elongate ink feed channels extend, a plurality of actuators, one of the actuators being positioned in each of the chambers respectively for ejecting drops of ink through the nozzle, a plurality of ink inlet channels connecting the ink feed channels to the array of chambers and, layers of CMOS drive circuitry supported on the silicon substrate.

Abstract: The mist ejection head has: a nozzle plate in which a nozzle hole for ejecting liquid is formed; a liquid chamber connected to the nozzle hole; an ultrasonic wave generating device which applies an ultrasonic wave to the liquid in the liquid chamber; and a reflective wall which reflects the ultrasonic wave applied to the liquid, wherein: the reflective wall is disposed so as to oppose the nozzle plate and has an axially symmetrical shape comprising a portion of a parabolic surface, the portion including an apex of the parabolic surface and being on an apex side with respect to a focal point of the parabolic surface; an axis of the parabolic surface passes through the nozzle hole; and the focal point of the parabolic surface is positioned in a vicinity of the nozzle hole.

Abstract: An inkjet drop ejection apparatus includes a chamber defined by a plunger spaced from an ejection nozzle; and an actuator for moving the plunger towards the nozzle, the actuator including a magnetic plate and a solenoid coil provided circumferentially between the magnetic plate and the plunger, the solenoid coil for inducing a magnetic field in at least one of the magnetic plate and the plunger. The plunger has defined therethrough a series of apertures arranged around a circumference of the plunger, the apertures substantially mapping a locus of the solenoid coil.

Abstract: An ink nozzle unit is provided for an inkjet printhead. The nozzle unit includes a substrate assembly. A nozzle extends from the substrate assembly. The nozzle defines an internal nozzle chamber and an ink ejection portal through which ink supplied to the nozzle chamber can be ejected. A magnetic field generator is configured to generate a magnetic field passing though the nozzle chamber. A paddle is movably mounted within the nozzle chamber and includes at least one solenoid coil. An actuator is configured to activate the solenoid coil so that the paddle moves and ejects ink within the nozzle chamber out through the ink ejection portal.

Abstract: A developer supply device, includes: a developer holder; and a developer reservoir which is disposed inside of the developer holder, holds a liquid developer, and has at least one supply section that supplies the liquid developer from the developer reservoir to the developer holder, the liquid developer including a toner and an aqueous medium, and the developer supply device supplying the liquid developer that has been supplied to the developer holder to a medium which is a supply target for the liquid developer.

Abstract: An actuator includes a deformable substrate, a magnetic body having an opening, provided above the substrate, and a coil that is disposed above the substrate and surrounds the magnetic body.

Abstract: A printhead that has an array of ink ejection nozzles, an array of chambers adapted to store ink for ejection through each of the nozzles respectively, a plurality of ink inlet channels for feeding ink the array of chambers, and a plurality of actuators, one of the actuators being positioned in each of the chambers respectively for ejecting drops of ink through the nozzle. A plurality elongate ink feed channels is connected to the ink inlet channels. Each of the ink inlet channels is long and narrow relative to the dimensions of the chamber such that ink in said chamber is restricted from flowing out during ink drop ejection by viscous drag generated by the ink inlet channel. This enhances the droplet ejection efficiency as less of the pressure pulse generated by the actuator is lost to ink back flow.

Abstract: An inkjet drop ejection apparatus 1010 having a chamber 1012 with a nozzle 1011; and an actuator with a thermal bend arm 1034. The arm has a cold portion 1024 and a hot portion 1022 such that thermal expansion of the hot portion bends the arm. The cold portion is positioned for greater exposure to ink flow than the hot portion. The heat generated by the hot portion of the thermal bend arm can heat up the cold portion. As the cold portion heats, it expands thereby forcing the hot portion to heat to a higher temperature to achieve the same expansion differential that provides the required bend in the arm. By positioning the cold portion for greater exposure to the ink flow, it dissipates heat to the ink and its temperature is more stable. This in turn improves the efficiency of the arm and the entire printhead.

Abstract: Embodiments of a cleaner are disclosed.

Abstract: A magnetostatic actuator uses a ferrofluid slug confined in a cylindrical tube which is wrapped in a conducting coil. By applying a current to the coil, a magnetic field is generated inside the coil. The ferrofluid slug may be attracted to the interior of the coil by the interaction of its magnetic moment with the field generated inside the coil. Movement of the ferrofluid slug in response to the magnetic field may be used to actuate various devices, such as a droplet dispenser.

Abstract: An inkjet printhead with an array of ink ejectors 1 for printing onto a media substrate, each ink ejector 1 having a chamber 2 for holding ink 3, a nozzle 11 and an actuator 5 for movement within the chamber 2; such that, movement of the actuator 5 in one direction forces a quantity of ink out of the chamber 2 and towards the media substrate and subsequent movement of the actuator 5 in an opposing direction assists the quantity of ink to form a droplet 18.

Abstract: A liquid drop discharger includes a coil for generating a magnetic field based on an electric current that is applied; a moving section, removably disposed with respect to the coil so as to be movable in a central axial direction of the coil, for generating an induced current by the magnetic field generated by the coil; device for vertically applying a magnetic field to a peripheral surface of a peripheral member, where the induced current is generated, of the moving section; and a discharge opening, which moves together with the moving section, for discharging a liquid by changing the volume of a liquid chamber containing the liquid as a result of the movement of the moving section.

Abstract: A method of operating a liquid ejection device including a fluid chamber having a fluid outlet port in a wall of the chamber; a fluid inlet port in a wall of the chamber and a paddle located in the chamber, the paddle including a fluid directing means; the method including urging the paddle from a first position to a second position to cause ink to flow out of the outlet and thereby cause a meniscus to bulge, the motion causing the fluid directing means to direct fluid away from the inlet and urging the paddle from the second position to a first position to cause the meniscus to break thereby ejecting ink from the outlet.

Abstract: Microelectromechanical pagewidth printheads include a very large number of ink ejection nozzles fabricated upon a silicon wafer. Ink stored in the printhead subsequent to a printing operation is vulnerable to becoming undesirably viscous thereby causing inconsistent printing. In order to address this problem the present invention provides a printhead recapping mechanism. The mechanism includes a base portion, that includes a solenoid coil and a movable capping portion which incorporates magnetically attractive material responsive to the coil. A spring biases the capping portion to a quiescent capping position when the printhead is not in use. During printing operations a current is applied to the solenoid coil to overcome the biasing spring and draw the capping portion from the capping position.

Abstract: A method of firing a plurality of jetting heaters in an ink jet printer includes identifying a first of the jetting heaters to be fired. A second of the jetting heaters to be fired immediately after the firing of the first jetting heater is also identified. Power is simultaneously applied to each of the first jetting heater and the second jetting heater.

Abstract: A microinjector uses bubbles as virtual valves to eject droplets of different sizes. The microinjector is in fluid communications with a reservoir and has a substrate, an orifice layer, and a plurality of nozzles. The substrate has a manifold for receiving ink from the reservoir. The orifice layer is positioned on the top of the substrate so that a plurality of chambers are formed between the orifice layer and the top of the substrate. Each of the nozzles has an orifice and at least three bubble generating components. The bubble generating components are selectively driven by a driving circuit so that each nozzle can eject droplets of different sizes.

Abstract: A ferro-fluidic inkjet printhead sealing and spitting system is provided for maintaining inkjet printhead health, prior to and after installation in an inkjet printing mechanism. As a ferro-fluidic capping system for sealing printhead nozzles which eject ink having either polar properties or non-polar properties, the system includes a support structure engageable with the printhead, and a magnetic element supported by the support structure. A ferro-fluidic fluid overlays the magnetic element to seal against the printhead nozzles when the support structure is engaged with the printhead. The ferro-fluidic fluid has polar properties when the ink has non polar properties, and non-polar properties when the ink has polar properties. The ferro-fluidic fluid may be used to receive ink spit from the printhead, or when used with an adhesive tape, to protect an inkjet cartridge during shipping. An inkjet printing mechanism having such a ferro-fluidic system, along with associated methods are also provided.

Abstract: The invention relates to a structure comprising a sequence of elements (t) for sending or receiving a signal along an axis. Two successive elements (t) along the direction of the axis are offset with respect to each other along the direction perpendicular to the axis. The structure comprises at least two layers of material (K1, K2) deposited on a reception substrate (S1) using the layer transfer technique.

Abstract: Disclosed are an electrification apparatus and an image forming apparatus which reduce ozone generation, provide uniform electrification of a photosensitive body, and have high durability. This electrification apparatus comprises: a first magnet means composed of a magnetized base body obtained by magnetizing a base body of the photosensitive body drum or a magnet configured inside of the base body of the photosensitive body drum; a second magnet means magnetically levitated outside of the photosensitive body drum by the first magnet means; and a discharge electrode firmly attached to a face of the second magnet means opposed to the photosensitive body surface, the discharge electrode having a predetermined distance to the photosensitive body surface.

Abstract: This invention relates to a magnetographic printing process consisting of creating magnetized recorded dots on a surface of a magnetic recording element (3) by at least one elementary magnetic head (2), spraying ink particles on each of the magnetized recorded dots in order to form images composed of image dots, and increasing the energy supplied to the first magnetized recorded dots compared with the energy supplied to other magnetized dots. This invention also relates to a magnetographic printer using the said process.

Abstract: An apparatus for dispersing a first plurality of conductive elongated nano-elements distributed within a carrier-fluid to assemble a conductive device made of a first charge-receptive area of a support surface to which at least one nano-element has attached, including: a nozzle through which the elongated nano-elements are directed such that the nano-elements pass through an electromagnetic field for imparting a preselected charge thereto, and toward at least the first charge-receptive area. The charge-receptive area is given a charge such that it attracts a first end-portion of one of the nano-elements. Also, a method of assembling a conductive device.

Abstract: A ferro-fluidic inkjet printhead sealing and spitting system is provided for maintaining inkjet printhead health, prior to and after installation in an inkjet printing mechanism. As a ferro-fluidic capping system for sealing printhead nozzles which eject ink having either polar properties or non-polar properties, the system includes a support structure engageable with the printhead, and a magnetic element supported by the support structure. A ferro-fluidic fluid overlays the magnetic element to seal against the printhead nozzles when the support structure is engaged with the printhead. The ferro-fluidic fluid has polar properties when the ink has non polar properties, and non-polar properties when the ink has polar properties. The ferro-fluidic fluid may be used to receive ink spit from the printhead, or when used with an adhesive tape, to protect an inkjet cartridge during shipping. An inkjet printing mechanism having such a ferro-fluidic system, along with associated methods are also provided.

Abstract: A method of manufacture of an ink jet print head arrangement is disclosed including a series of nozzle chambers, the method comprising the steps of: (a) utilizing an initial semiconductor wafer having an electrical circuitry layer formed thereon on; (b) etching a series of slots in at least the circuitry layer to define a nozzle cavity inlet; (c) depositing and etching a first layer of magnetic flux material on the electrical circuitry layer to define a first magnetic plate; (d) depositing and etching a insulating layer on the first layer and the electrical circuitry layer, the etching including etching vias for a subsequent conductive layer; (e) depositing and etching a conductive layer in for form of a conductive coil conductively interconnected to the electrical circuitry layer; (f) depositing and etching a hydrophobic material layer in the region of the conductive coil; (g) depositing and etching a sacrificial material layer in the region of the first magnetic plate and the coil, the etching including def

Abstract: A method of manufacturing an ink jet printhead includes providing a substrate. A doped layer is deposited on the substrate and is etched to create an array of nozzles on the substrate with a nozzle chamber in communication with each nozzle. Planar monolithic deposition, lithographic and etching processes are used to form a plunger arranged reciprocally within each nozzle chamber to be displaceable towards and away from the nozzle to effect ink ejection and nozzle chamber refill, respectively, and an actuator arranged externally of the nozzle chamber to effect reciprocation of the plunger.

Abstract: This patent describes a method of manufacturing a permanent magnet electromagnetic ink jet print head wherein an array of nozzles are formed on a substrate utilising planar monolithic deposition, lithographic and etching processes. Multiple ink jet heads are formed simultaneously on a single planar substrate such as a silicon wafer. The print heads can be formed utilising standard VLSI/ULSI processing and can include integrated drive electronics formed on the same substrate. The drive electronics preferably being of a CMOS type. In the final construction, ink can be ejected from the substrate substantially normal to the substrate plane.

Abstract: There is provided a magnetic ink jetting apparatus which, when magnetic ink is jetted from an ink jet apparatus, uniformly mixes the pigment and liquid of the magnetic ink and jets it. The magnetic ink jetting apparatus for jetting the magnetic ink with a uniform mixture of pigment and liquid includes a plurality of ink chamber barriers forming an ink chamber for receiving the magnetic ink, and a magnetic layer creating magnetism in the ink chamber so as to concentrate the pigment of the magnetic ink, the magnetic layer being formed between the plurality of ink chamber barriers.

Abstract: A ferromagnetic ink is formed by a dispersion of ferromagnetic particles mixed with an ink base. Drops of the ink are ejected from an inkjet printhead to print characters or markings onto a print media sheet. To resist clogging printhead nozzles, the dispersed ferromagnetic particles have an average diameter equal to or less than approximately 1/10 of the average nozzle diameter. A magnetic field is applied to the ejected ink drops during printing to direct, or more specifically bias, the ink drops toward the print media. The magnetic "biasing" force aids in maintaining drop shape along the ejection path, and in reducing bounce. As a result, edge roughness and spray are decreased so as to improve print quality. In alternative embodiments, the magnetic field source is formed by a permanent magnet or electromagnet. Such a field source is integral to or adjacent to a printer platen. The field source is located adjacent to the printhead and in several embodiments extends along the scan path of the printhead.

Abstract: An inkjet printing method and apparatus in which an ejecting head is rotated to selectively eject ink by centrifugal force. The viscosity of ink is varied electrically or magnetically. The method and apparatus requires no additional heater, piezoelectric element or compressor, thereby simplifying the structure and reducing the production cost of the printer.

Abstract: A method and apparatus for direct production of photopolymeric printing plates. The method comprises forming a positive and/or negative image on a substrate by ink-jet printing with a photopolymeric ink composition, optionally preheated. The apparatus for carrying out the method of the invention comprises a rotatable drum adapted for retaining on its inner or outer surface the substrate to be printed; a carriage, displaceable axially in respect of the drum; a container for a photopolymeric ink composition; at least one nozzle communicating with the carriage for ejecting the photopolymeric ink composition; and a UV source located so as to expose the printed surface of the substrate to UV radiation.

Abstract: An apparatus for recording information carried by an electro-magnetic radiation beam. The apparatus has a recording unit having two electrodes, a photoconductive member and a recording member of liquid crystals capable of holding electric charges, the members being arranged so as to face each other between the electrodes. An electro-magnetic radiation beam carrying information to be recorded is directed to the photoconductive member under presence of a voltage across the electrodes. An electric field corresponding to a conductivity variation of the photoconductive member according to the information is thus applied to the recording member to form a charge latent image corresponding to the information on the recording member. The recording member is then heated so that an intensity of the applied electric field exceeds a specific threshold level at which an optical characteristic of the liquid crystal begins to vary according to the charge latent image.