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4783670 |
Ink jet print head and manufacture thereof
The head comprises a hollow body (21) carrying a series of capillary tubes (12) of rigid material, on to each of which is fixed a sleeve-type piezoelectric transducer (16). A resin (26) is injected...
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4782350 |
Amorphous silicon varactors as rf amplitude modulators and their application to acoustic ink printers
Amorphous silicon (aSi) voltage-controlled, variable capacitors (varactors) are utilized as rf amplitude modulators, such as for amplitude modulating the rf applied to an acoustic ink printhead....
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4777497 |
Ink jet printing head having a flexible film covered ink supply chamber
An ink jet printing device including a printing head having a nozzle through which ink can be ejected. The head includes an internal chamber ink and ink ejection is caused by internal pressure...
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4771298 |
Drop-on-demand print head using gasket fan-in
An ink jet drop-on-demand print head comprises a plurality of electromechanical transducers, and ink from a manifold is conveyed to the transducers. The fluid path between the transducers and the...
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4768266 |
Method of making an ink jet printer transducer array
A transducer array for an ink jet printing apparatus includes a plurality of discrete transducer elements, each of which are comprised of a poled ferroelectric material arranged and bonded along...
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4769653 |
Multihead liquid emission recording apparatus
A multihead liquid emission recording apparatus comprises a plurality of liquid emission nozzles; a plurality of electromechanical conversion elements each provided for each of said plurality of...
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4752790 |
Control circuit for an ink jet head
Two consecutive voltage pulses of equal duration (T 1 , T 2 ) and opposite polarities are applied to the control circuit. The two pulses which are combined together and amplified give rise to a...
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4751529 |
Microlenses for acoustic printing
A printhead for an acoustic printer comprises one or more acoustic microlenses, each of which brings an acoustic beam to focus approximately at the free surface of a pool of ink for ejecting...
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4751530 |
Acoustic lens arrays for ink printing
To facilitate the fabrication of acoustic printheads, arrays of spherical acoustic lenses are provided for bringing rf acoustic waves to essentially diffraction limited focii at or near the free...
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4743924 |
Control circuit for an ink jet printing element and a method of dimensioning and manufacture relating thereto
A control circuit (17) applies a voltage pulse to a piezoelectric transducer (16) to create pressure in a chamber (10) open to an ink reservoir (14) at one end and closed by an ink nozzle (13) at...
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4728969 |
Air assisted ink jet head with single compartment ink chamber
An air-assisted drop-on-demand ink jet head 10 has a single compartment ink chamber 14 and is designed for operation over a wide range of ink drop repetition rates, including extremely high...
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4727378 |
Method and apparatus for purging an ink jet head
An ink jet head 10 has an ink chamber 14 which receives ink from an ink inlet passageway 38. Pressure pulses applied to the ink chamber cause the ejection of ink drops from an ink drop forming...
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4727012 |
Method of manufacture for print heads of ink jet printers
A print head of an ink jet printer is formed by a multilayer structure composed of a plurality of individual photoplastic films, segments of such films having a prescribed contour being removed by...
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4719480 |
Spatial stablization of standing capillary surface waves
Provision is made spatially stabilizing standing capillary surface waves in fixed and repeatable locations with respect to stationary external references. For spatially stabilizing such a wave on...
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4719476 |
Spatially addressing capillary wave droplet ejectors and the like
Provision is made for selectively addressing inividual crests of traveling or standing capillary surface waves to eject droplets from the selected crests on command. To that end, the addressing...
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4717927 |
Liquid injection recording apparatus
A liquid injection recording apparatus which discharges liquid droplets by the contraction or expansion of a piezo-electric element and effects recording by the use of the discharged liquid...
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4716418 |
Apparatus and method for ejecting ink droplets
Apparatus for the ejection of ink droplets having a fluid filled channel having a discharge opening at one end, and a cross-sectional expansion at the other, so that pressure waves within the...
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4714936 |
Ink jet printer
A rotary ink jet printer can print at high speed in black and white as well as in color using hot-melt inks. The printer includes a rotary print wheel which supports a plurality of ink jetters...
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4714935 |
Ink-jet head driving circuit
An ink-jet head driver comprises: a pressure chamber filled with a recording liquid; a piezo-electric element as electrical/mechanical transducing means for enlarging the capacity of the pressure...
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4704675 |
Method for velocity adjustment of ink jet nozzles in a nozzle array
In an ink jet printer utilizing piezo ceramic actuators to generate ink droplets, the velocity of the ink droplets is controlled by adjusting the piezoelectric effect of the actuators.
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4700203 |
Ink jet head for compressing ink to eject drops of ink
An ink jet head for compressing ink in an ink chamber to eject a drop of the ink from a nozzle. Ink compressing means for compressing the ink in the ink chamber by expanding and contracting in...
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4698644 |
Drop-on-demand ink jet print head
An ink jet drop-on-demand print head comprises a plurality of tubular piezoelectric transducers each having two electrodes formed by an electrically conducting coating. A housing member holds the...
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4697195 |
Nozzleless liquid droplet ejectors
A nozzleless print head for ink jet printing and the like comprises one or more essentially planar surface acoustic wave transducers which are submerged at a predetermined depth in a liquid filled...
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4692776 |
Drop dispensing device and method for its manufacture
A fluid drop dispensing device, particularly suited for ink jet printer heads, in which a circular electroactuator is supported in concentric relationship with inner and outer ring members defining...
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4689641 |
Ink jet printing head
One or more printing elements in tube form with a capillary nozzle at one end are mounted in aligned and mutually parallel relationship with a cavity in a support. The printing elements have...
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4685185 |
Method of manufacturing an ink jet head
An aperture plate for an ink jet head is formed by micro electrical discharge machining one surface of the plate to form a dimple-like recess with a relatively wide flat base. An aperture is then...
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4686539 |
Multipulsing method for operating an ink jet apparatus for printing at high transport speeds
A method for both reducing the ligament length and satellite droplet problems associated with producing high velocity ink droplets from an ink jet head printing at relatively high ink jet head...
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4683477 |
Ink jet print head
An ink jet print head of the type having an elongated rectangular print head body that is vibrated at its resonant frequency to stimulate formation of ink drops is provided with a rigid ink supply...
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4672397 |
On-demand type ink-jet print head having an air flow path
An on-demand type ink-jet printer with a thin cylindrical tip end coaxially projecting into a cylindrical passageway. Ink droplet formation is controlled by a piezoelectric transducer. A stream of...
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4672398 |
Ink droplet expelling apparatus
Disclosed is an ink droplet expelling apparatus for expelling an ink droplet in response to an electric signal, compising a printing head provided with one or more ink chambers, electro-mechanical...
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4668964 |
Stimulator for inkjet printer
A method of assembling a stimulator for an inkjet printer by attaching separate piezoelectric elements to a plastic or metallic membrane sheet which sheet, after encapsulation of the piezoelectric...
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4665409 |
Write head for ink printer devices
The invention relates to a write head for ink printer devices comprising tubular ink channels which are surrounded over a part of their length by individually drivable small piezo tubes and which...
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4651161 |
Dynamically varying the pressure of fluid to an ink jet printer head
A hydraulic circuit and related method are provided for dynamically varying the pressure of ink supplied to an ink jet printer head to obtain consistent volume ejected ink drops despite differences...
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4641155 |
Printing head for ink jet printer
A mechanically balanced pulsed ink droplet mechanism includes a disk or ring of piezoelectric ceramic material positioned within a metal ring of rectangular cross section having an annular channel...
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4641153 |
Notched piezo-electric transducer for an ink jet device
The ink ejecting portion of an ink jet printer is described, wherein a single ceramic transducer is used to create the pressure for the ink droplets. Unlike prior devices, the transducer is a...
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4639735 |
Apparatus for driving liquid jet head
An apparatus for driving a liquid jet head comprises: a piezoelectric element which mechanically deforms responsive to an electric signal; a pressure chamber whose volume varies due to the...
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4639747 |
Recording head drive control apparatus
There is provided a liquid jet recording apparatus comprising: recording heads whose recording densities vary in response to drive signals; drive circuits to drive the recording heads; a control...
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4635079 |
Single element transducer for an ink jet device
The ink ejecting portion of an ink jet printer is described, wherein a single ceramic transducer is used to create the pressure for the ink droplets. Unlike prior devices, the transducer is a...
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4630072 |
Jet printing apparatus
The apparatus is of the type wherein a piezoelectric transducer (19) is selectively operated to produce a pressure wave in the ink in a duct (16, 22), which causes a droplet of ink to be expelled...
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4625373 |
Method of making a printing head for an ink jet printer
The method of making a print head of the type that includes a piezoelectric transducer positioned within a metal housing having an annular channel in its inner surface that is sealed by a thin...
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4625221 |
Apparatus for ejecting droplets of ink
An apparatus for ejecting droplets of ink including: a passage for ink; an orifice disposed at one end of the passage; a pressure-applying device for applying a pressure wave to the ink within the...
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4625220 |
Monitoring apparatus for liquid jet recording head
Liquid jet apparatus comprises: a liquid jet head having an electrical-mechanical transducing element to discharge a liquid; a drive circuit for supplying a driving signal to the...
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4623904 |
Ink-jet printing head, a method for its manufacture, and a tool useable for carrying out this method
Mounted within a substantially hollow supporting and containing housing are tubes which communicate at one end with an ink reservoir and whose opposite ends are aligned with respective ink...
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4611219 |
Liquid-jetting head
A liquid-jetting head comprising a plurality of liquid-jetting-pressure-generating elements and a plurality of liquid-jetting orifices opposite to said elements through a liquid passage is...
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4609925 |
Method for removing air bubbles or solid impurities from the printing head of a drop-on-demand type ink jet printer
An ink jet printer wherein a mechanical vibration is applied by an electromechanical transducer secured to a printing head to the ink in a nozzle and a pressure chamber of the printing head when...
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4605167 |
Ultrasonic liquid ejecting apparatus
An ultrasonic liquid ejecting apparatus for discharging liquid droplets comprises a housing including a chamber for holding liquid therein having an intake port connected to a liquid supply...
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4599626 |
Ink drop ejecting head
An ink jet head for ejecting drops of ink in an ink jet printing system is designed for easy disassembly for cleaning and can readily be made in different sizes including one capable of ejecting...
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4593291 |
Method for operating an ink jet device to obtain high resolution printing
The volume of the ink chamber of an ink jet device is rapidly expanded for pulling back into the chamber from an orifice a meniscus of ink, for forming a cusp shaped disturbance on the meniscus,...
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4591883 |
Ink-jet printer head
A printer head for use in an on-demand type ink-jet printer includes a main body which is provided with a nozzle opening, through which ink is ejected to form flying ink droplets, and an ink...
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4588998 |
Ink jet head having curved ink
An ink jet head for compressing ink in an ink chamber to eject a drop of the ink from a nozzle. Ink compressing means for compressing the ink in the ink chamber by expanding and contracting in...
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