Abstract: A piezoelectric printhead or other droplet deposition apparatus has parallel liquid containing channels defined by a base and displaceable walls, and covered by a cover number. The channels each have at least one nozzle for ejecting droplets. Each nozzle may be disposed in the base, the cover then having two ink supply parts spaced lengthwise of each channel on opposite sides of the nozzle. Alternatively two longitudinally spaced nozzles may be provided in the base of each channel. The cover may have a conductive track corrected to wall-displacing electrodes, the points of connection being outside the channels.

Abstract: A cavity plate for an ink-jet printhead includes a base material and a chamber sheet. An ink channel array constituting ink chambers is provided through the chamber sheet by a wire electric discharge machine, while an ink reservoir is formed on the base material by a wire electric discharge machine. Then, the chamber sheet and the base material are bonded to one another. Nozzles to eject ink may be created on a nozzle sheet, which is later connected to the chamber sheet. Alternatively, the nozzles may be directly provided on the chamber sheet. Thus, the cavity plate is provided having the ink chambers and the ink reservoir with high precision, without the increase in the production cost.

Abstract: In droplet deposition apparatus comprising one or more independently actuable ink ejection chambers, electrical signals are applied to reduce variation in the temperature of the droplet fluid between chambers and with variations in droplet ejection input data. Short potential difference pulses, suitable for influencing the temperature of the droplet fluid in a chamber, can be generated by application of longer duration voltages to ink chamber actuation means.

Abstract: A method of inflating a tire, or vehicle tire, that minimizes the amount of time needed for same is disclosed. The method of inflating a tire with a tire pressure management system includes introducing continuous fluid flow of a fluid into the tire, ascertaining the dynamic pressure of the fluid during said introducing continuous fluid flow, terminating continuous fluid flow when the dynamic pressure exceeds or equals a predetermined amount, and introducing pulsed fluid flow of the fluid into the tire.

Abstract: A mass flowmeter includes a flow straightener or rectifier having a honeycomb member. The honeycomb member has at least one honeycomb, which is aligned with a sensor element in a flow direction. Two walls of that honeycomb enclose an angle. The sensor element is positioned with reference to a bisector axis of the angle enclosed by the two honeycomb walls in such a way that a mass flow thereto corresponds approximately to a mean value of a wave-shaped air flow in direction of the bisector axis when the flow is about to change over from laminar to turbulent flow.

Abstract: A highly sensitive Coriolis flowmeter, which is also utilizable as a density meter, is composed of: a substrate having two conduits through which a fluid to be measured flows; a curved tube fixed to the substrate in such manner that one end connects with one conduit and another end connects with another conduit; two curved rods having a curve identical to the curve of the curved tube each of which is fixed to the substrate on each side in parallel with the curve tube with a space; vibrators attached to the tube and rods which generate vibrations in such manner that the tube and rods vibrate in opposite phase; and a sensor for detecting variation of vibration of the tube which is caused by a Coriolis force occurring when a fluid flows through the tube.

Abstract: An ultrasonic flowmeter is disclosed that detects the speed, amount, and composition of a two-phase flow travelling through it. One or more ultrasonic paths corresponding to ultrasonic transducers are positioned to detect the velocity and speed of sound through one phase of the two-phase flow. A second ultrasonic path is positioned to travel through the one phase of the two-phase flow, but to reflect off the interface between of interface of the two phases. A third ultrasonic path is positioned to travel through the second phase of the two-phase flow, but once again reflects off the interface between the two phases. The information of transit times for ultrasonic signals along these ultrasonic paths provides the speed of the two-phase flows, the amount of the two-phase flows, and the compositions of the two-phase flows. A quality assurance check ensures that the measurements are accurate.

Abstract: A device for the contactless detection of a potentially existing essentially edge-free irregularity in a convex surface, which has a structuring that is delimited by edges, comprises a unit for creating a three-dimensional representation of the surface, a unit for extracting the convexity from the three-dimensional representation of the surface and for smoothing the edges of the structuring so as to obtain a convex-free representation of the convex surface which exhibits the irregularity and the structuring, whose edges have now been smoothed, a unit for comparing the convex-free representation with a threshold value so as to identify areal regions of the convex-free representation which are determined by a predetermined relationship to the threshold value, and a unit for analyzing the areas of the identified regions, a region being detected as an irregularity if its area exceeds a predetermined area.

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: In the embodiments described in the specification, a piezoelectric transducer has electrodes to the piezoelectric layer with an adhesive bonding agent under pressure applied hydraulically so as to be distributed uniformly throughout the surface of the piezoelectric layer. In one embodiment the dielectric film also carries conductor arrays for connecting the electrodes to remote driver chips at locations spaced from the surface of the piezoelectric layer.

Abstract: It is an object of the present invention to provide an inkjet head and its manufacturing method, which may realize a high resolution while maintaining at a desired strength those walls which define a plurality of ink supply channels between the common ink chamber and each pressure chamber, and securing the adhesion areas on these walls. The inkjet head is miniaturized in a direction in which the pressure chambers are arranged, by arranging a plurality of ink supply channels that are connected to each pressure chamber perpendicular to the direction in which the pressure chambers are arranged.

Abstract: In an ink jet head for performing charging and discharging between diaphragms and electrodes to transform the diaphragms to thereby eject ink drops from nozzle holes, a control circuit (60) of this ink jet head is constituted by an integrated circuit which is provided on a nozzle plate (300), a diaphragm substrate (200) or an electrode glass substrate (100) of an ink jet head chip (7).

Abstract: The present invention provides a simple design for a temperature-insensitive extrinsic polarimetric strain sensor. The sensing element is a thin sheet of photoelastic material that is bonded to the test object. It is illuminated with linearly polarized light with the polarization direction at 45 degrees relative to the strain-induced fast and slow axes in the photoelastic material. The sensor measures the difference between the strains along these two orthogonal directions. The reduced sensitivity of the sensor to temperature results from the fact that the illumination is perpendicular to the surface of the test object. All polarization components that are parallel to the surface will experience identical refractive index changes due to thermal effects. Consequently, a measurement of the difference in strains along two directions in the surface plane is insensitive to temperature.

Abstract: A method and apparatus for determining gas and liquid flow rates in a multi-phase flow are provided. In accordance with one embodiment of the present invention, a method of determining gas and liquid flow rates in a multi-phase flow is provided. The method utilizes a set of gas phase ultrasonic transducers and a set of liquid phase ultrasonic transducers positioned to direct ultrasonic signals through the multi-phase flow.

Abstract: Actuator independently dedicated to nozzles divided into a plurality of groups are fixed to a common flow path unit having the nozzles formed therein with through holes aligned with one another. Heads of various types can be formed by using the actuator units of the same design only by changing the mode of arrangement of the nozzles in accordance with the purpose.

Abstract: Flow indicator with the purpose to indicate direction of the air flow between two rooms separated by a wall. The indicator comprises a tube (12) that is mounted in an opening of the wall (10). Inside the tube is a smooth-running body (16) mounted that easily moves towards the end of the tube by pressure difference arised air flow. Both ends of the tube are provided with end-stops (18) that are constructed to prevent the body (16) to leave the tube and are provided with one or more openings (20) that admits air to pass into the interior of the tube.

Abstract: Gas flow sensor 10 generally comprises housing 20 defining internal cavity 40, diaphragm assembly 50 separating internal cavity 40 into first chamber 42 in communication with gas inlet 44 and second chamber 46 in communication with gas outlet 49 and having orifices 66 therethrough for passage of gas, valve 70 mounted on diaphragm assembly 50 for closing and opening orifices 66; and a sensing unit 80 sensing when diaphragm assembly 50 has moved at least to a predetermined location. Incoming gas moves diaphragm assembly such that valve 70 is pressed against wall 47 of second chamber 46 whereby valve 70 is opened and gas passes through orifices 66 and out gas outlet 49.

Abstract: An apparatus and method for making and using two measurements to correct metered flow rate values when liquids are present in a multiphase flow stream. The apparatus includes a conduit (10), an orifice (12) positioned within the conduit for creating differential pressure, a gamma ray densitometer including a radient energy source (22) and a radient energy detector (26) placed at an upstream side of the orifice for measuring upstream cross-sectional area and a pressure recovery port (34) placed downstream of the orifice for measuring the pressure recovery value.

Abstract: A coiled ink supply tube for an X, Y plotter and the like is connected between an ink reservoir and a pen mounted within a pen holder and moveable with the pen holder between a raised non-drawing position and a lowered drawing position for drawing lines or graphics on receiving surfaces. The ink supply tube defines a preformed coil having 11/4 turns or windings in the form of a helix with substantially zero spacing between turns. The ink supply tube also defines a straight inlet section coupled between the coil and the reservoir and oriented parallel to the axis of the coil, and a straight outlet section substantially coaxial with a vertical axis of the pen and lying in a plane substantially perpendicular to the axis of the coil. As the pen moves up and down between the raised non-drawing and lowered drawing positions, the diameter of the helical coil changes very little and substantially no lateral forces are imposed by the ink supply tube on the pen.

Abstract: An impulse fluid jet apparatus having pulse generating circuitry for an impulse jet. The circuitry generates driving a longer pulse exciting the resonant frequency of the jet and a shorter pulse for exciting a higher harmonic frequency of the jet. The longer pulse changes the state of energization of the transducer in the jet to eject a droplet of fluid and the shorter pulse changes the state of energization so as to break off the tail of the droplet.