EP0057594A2 - Tintenstrahlgerät - Google Patents

Tintenstrahlgerät Download PDF

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Publication number
EP0057594A2
EP0057594A2 EP82300479A EP82300479A EP0057594A2 EP 0057594 A2 EP0057594 A2 EP 0057594A2 EP 82300479 A EP82300479 A EP 82300479A EP 82300479 A EP82300479 A EP 82300479A EP 0057594 A2 EP0057594 A2 EP 0057594A2
Authority
EP
European Patent Office
Prior art keywords
ink jet
waveguide
chamber
jet apparatus
transducer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP82300479A
Other languages
English (en)
French (fr)
Other versions
EP0057594A3 (en
EP0057594B1 (de
Inventor
John Garcia Martner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cessione dataproducts Corp
Original Assignee
Exxon Research and Engineering Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Exxon Research and Engineering Co filed Critical Exxon Research and Engineering Co
Priority to AT82300479T priority Critical patent/ATE14543T1/de
Publication of EP0057594A2 publication Critical patent/EP0057594A2/de
Publication of EP0057594A3 publication Critical patent/EP0057594A3/en
Application granted granted Critical
Publication of EP0057594B1 publication Critical patent/EP0057594B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/145—Arrangement thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/055—Devices for absorbing or preventing back-pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2/14201—Structure of print heads with piezoelectric elements
    • B41J2/14274—Structure of print heads with piezoelectric elements of stacked structure type, deformed by compression/extension and disposed on a diaphragm

Definitions

  • This invention relates to ink jets, more particularly, to ink jets adapted to eject a droplet of ink from an orifice for purposes of marking on a copy medium.
  • the stimulating element or transducers of such an array are sufficiently bulky so as to impose serious limitations on the density in which ink jets may be arrayed.
  • the transducers must typically comprise a certain finite size so as to provide the energy and displacements required to produce a change in ink jet chamber volume which results in the ejection of a droplet of ink from the orifice associated with the ink chamber.
  • the ink jet transducers become intimately associated with the fluidic section of the ink jet, i.e., the ink chambers and orifices.
  • any failure in the fluidic section of the device which is far more common than a failure of the transducer, dictates the disposal of the entire apparatus, i.e., both the fluidic section and the transducer.
  • an ink jet apparatus comprises an ink jet chamber including an inlet port for receiving ink in the chamber and an outlet orifice for ejecting ink droplets from the chamber.
  • a transducer is remotely located from the chamber and an elongated either solid or tubular acoustic waveguide is coupled between the ink jet chamber and the transducer.
  • the acoustic waveguide transmits acoustic pulses generated at the transducer to the chamber for changing the volume of the chamber in response to the state of energization of the transducer.
  • acoustic pulses are transmitted along the waveguide in the following manner.
  • the ends thereof move in an axial direction in an amount determined by the voltage applied to the transducer. If one end of said transducer is affixed to a solid back piece, the other end will move against the abutted end of the waveguide. The abutted end of the waveguide will then be driven along in the same direction by an amount corresponding to that of the end of the transducer.
  • the driving pulse is sharp, e.g., the voltage takes a short time to reach its final value
  • the end of the transducer will move fast; the end of the waveguide will move accordingly fast, and only part of said waveguide will be able to follow the fast motion.
  • the rest of the waveguide will stay at rest.
  • the end of the waveguide that was initially deformed will relax by pushing and elastically deforming consecutive portions along the waveguide. This successive displacement of the elastic deformation ultimately reaches the distal end of the waveguide.
  • the last portion thereof causes the fluid within the chamber to be compressed and thus causes the ejection of fluid droplets from the nozzle orifice.
  • the physical properties used in this invention are those of a true wave traveling along the waveguide length and not those of a push rod whereby when one end of the rod is moved, the other end will move in unison.
  • a plurality of such ink jets are utilized in an array such that the spacing from center to center of transducers is substantially greater than the spacing from axis to axis of the orifices.
  • This relative spacing of transducers as compared with orifices is accomplished by converging the acoustic waveguide toward the orifices.
  • all of the transducers are located at one side of the axis of the orifice at one extremity of the array.
  • the waveguides are of differing lengths along the axes of elongation.
  • the waveguides are tapered so that their diameter at the distal ends are substantially smaller than those at the transducer ends. This tapering of the waveguides provides yet closer spacing between the waveguides, thus further increasing the channel density.
  • the tapered ends of the waveguides are made of tubular material to provide a fluid feed channel to thus maintain the chambers filled with fluid.
  • the fluid feed channels are provided with an orifice at the distal end having a cross-sectional area smaller than the cross-sectional area of said fluid channel so as to serve as a restrictor to control the flow of fluid passing therethrough.
  • the chambers of the ink jets may include a diaphragm coupled to the waveguide such that the diaphragm contracts and expands in response to the state of energization of the transducer in a direction having at least a component parallel with the axis of the orifice.
  • each waveguide abutts the transducer and is held thereon by means of a metal or ceramic ferrule that fits both the transducer end and the waveguide end.
  • each acoustic waveguide is elongated such that the overall length along the axis of elongation greatly exceeds the dimension of the waveguide transverse to the axis.
  • an ink jet array comprising a plurality of jets 10 are arranged in a line so as to asynchronously eject ink droplets 12 on demand.
  • the jets 10 comprise chambers 14 having outlet orifices 16 from which the droplets 12 are ejected.
  • the chambers expand and contract in response to the state of energization of transducers 18, which are coupled to the chambers 14 by acoustic waveguides 20.
  • the waveguides 20 may actually penetrate into said chamber by a distance d i as shown in Fig. 2.
  • the use of the waveguides 20,which are coupled to the transducer 18 by a ceramic or metal ferrule 21, permits the jets 10 to be more closely spaced without imposing limitations on the spacing of the transducers 18.
  • the centers of the chambers may be spaced by a distance d which is substantially less than the distance between the centers of the transducers d t . This allows the creation of a rather dense ink jet array regardless of the configuration or size of the transducers 18.
  • Acoustic pulses are transmitted along the waveguide 20 in the following manner.
  • the ends thereof move in an axial direction, i.e., the direction parallel with the axis of elongation of the waveguide 20, in an amount determined by the voltage applied to the transducer 18. Since one end of the transducer 18 is affixed to a solid back piece, the other end will move against the abutting end of the waveguide 20. The abutting end of the waveguide 20 will then be driven in the same direction by an amount corresponding to the end of the transducer 18.
  • the end of the transducer will move fast; the end of the waveguide will move fast in a similar manner, and only part of the waveguide 20 will be able to follow the fast motion.
  • the rest of the waveguide will stay at rest.
  • the end of the waveguide that was initially deformed will relax by pushing an elastically deforming consecutive portion along the waveguides 20. This successive displacement of the elastic deformation ultimately reaches the distal end of the waveguide 20.
  • the last portion thereof causes the fluid within the chamber 14 to be compressed and thus causes the ejection of fluid droplets from the orifice.
  • the physical properties used are those of a true waveguide traveling along the waveguide length and not those of a piston whereby one end of the rod is moved and the other end will move in unison.
  • the chambers 14 are coupled to a passageway 24 in the waveguide 20 which is terminated at the distal end 22 by an opening 26.
  • the opening 26 is of a reduced cross-sectional area as compared with the cross-sectional area of the waveguide a greater distance from the orifice 16 (i.e., the passageway tapers) so as to provide a restrictor at the inlet to the chamber 14.
  • Ink enters the passageway 24 in the waveguide 20 through an opening 28, as perhaps best shown in Figs. 2, 2a and 2c.
  • the remainder of the waveguide 20 may be filled with a suitable material 30 such as a metal piece or epoxy encapsulant.
  • the distal end 22 of the waveguide 20 expands and contracts the volume of the chamber 14 in a direction 32 having at least a component parallel with the axis of the orifice 16. It will, or course, be appreciated that the waveguides 20 necessarily extend in a direction having at least component parallel with the direction of the expansion and contraction of the ends 22 of the waveguides 20.
  • the waveguides 20 as shown in Fig. 1 are elongated. As utilized herein, the waveguides 20 are considered elongated as long as the overall length along the axis of acoustic propagation greatly exceeds the dimension of the waveguide transverse to the axis, e.g., more than 10 times greater.
  • the waveguides 20 actually penetrate into the chambers 14.
  • the position of the waveguides 20 in the chambers 14 may be preserved by maintaining a close tolerance between the external dimension of the waveguides 20 and the walls of the chamber 14 as formed in a block 34.
  • the block 34 may comprise a variety of materials including plastics, metals and/or ceramics.
  • the transducers 18 are potted within a potting material 36 which may comprise elastomers or foams.
  • the waveguides 20 are also encapsulated or potted within a material 38 as shown in Figs. 1 and 2.
  • each waveguide 20 may be surrounded by a sleeve 40, which assists in attenuating fluxural vibrations or resonances in the waveguide 20.
  • sleeve 40 may be eliminated and the potting material 38 may be relied upon to attenuate resonances.
  • a suitable potting material 38 includes elastomers, polyethylene or polystyrene.
  • the potting material 38 is separated from the chamber block 34 by a gasket 41 which may comprise an elastomer.
  • the transducers 18 must be energized in order to transmit an acoustic pulse along the waveguides 20. Although no leads have been shown as coupled to the transducers 18, it will be appreciated that such leads will be provided for energization of the transducers 18.
  • ink flows through the inlet ports 28 in each of the waveguides 20 from a chamber 42 which communicates through a channel 44 to a pump 46.
  • the pump 46 supplies ink under the appropriate regulated pressure from a supply 48 to the chamber 42.
  • the pressure regulation afforded by the pump 46 is important, particularly in a typewriter environment, since considerable liquid sloshing and accompanying changes in liquid pressure within the chamber 42 and a passageway 44 may occur.
  • the end of the ink jet array is capped by a member 50 which covers foot members 52 at the ends of the transducers 22 as well as the end of the pump 46.
  • some of the waveguides 24 individually extend in a substantially straight line to the respective chambers 14. Others may be bent or curved toward the chambers 14.
  • a somewhat different transducer construction is utilized. More particularly, an integral transducer 118 having a plurality of legs 118(a-f) coupled to, for example, five jets 110 of the type shown in Fig. 1 through waveguides 120.
  • the configuration of the transducer block 118 is immaterial so far as the density of the array of ink jets is concerned.
  • the disposition of the array of ink jets 110 may be changed vis-a-vis the transducer block 118.
  • the arrangement of transducers 118(a-f) is offset laterally (shown as below) with respect to the axis x through the orifice of the jet 110 located at one extremity (shown as the upper extremity) of the array.
  • the ink jet arrays are well suited for use in a printer application requiring last character visibility because of the skewing of the transducers to one side of the array of jets 10.
  • a plurality of transducers 218 and jets 210 are mounted on a two-tiered head 200. Once again, the jets 210 are very closely spaced so as to achieve a dense array while the transducers 218 are more substantially spaced.
  • Fig. 5 shows an arrangement whereby two or more heads 200 shown in Fig. 4 are sandwiched together to thus form heads that have multiple rows of jets 210 with the purpose of multiplying the writing capability of the heads.and thereby increasing the resolution of the characters generated.
  • the overall lengths of the waveguides vary. This allows the distance between the transducers to be maximized so as to minimize cross talk between transducers as well as between waveguides.
  • a somewhat different embodiment is shown wherein the acoustic waveguides 20 are coupled to the chambers 14 in a somewhat different manner.
  • the ends of the chambers 14 remote from the orifices 16 are terminated by a diaphragm 60 including protrusions 62 which abut the waveguides 20.
  • Ink is capable of flowing into the chambers 14 through orifices 65 shown in Fig. 6a adjacent a restrictor plate 64.
  • the openings 65 communicate with a reservoir 66 in the manner disclosed in the aforesaid application.
  • the block 34 includes lands 68 which form the restrictor openings 65 to the chamber 14 in combination with the restrictor plate 64.
  • the pulse from a transducer travels along each of the waveguides 20 in the embodiment shown in Fig. 6 until such time as it reaches a projection 62 on the diaphragm 60.
  • the diaphragm 60 expands and contracts in a direction generally corresponding to and parallel with the axis of elongation of the waveguides 20 at the projection 62.
  • the fluidic reaction of this embodiment including the chamber 14 may be reparable from the waveguides 20 at the diaphragm 62 in accordance with one important object of the invention.
  • Acoustic waveguides suitable for use in the various embodiments of this invention include waveguides made of such material as tungsten, stainless steel or titanium, or other hard materials such as ceramics, or glass fibers. In choosing an acoustic waveguide, it is particularly important that the transmissibility of the waveguide material be a maximum for acoustic waves and its strength also be a maximum.
  • the mechanism by which the waveguides operate in conjunction with the transducer may be described as follows.
  • An electrical pulse arrives at the transducer.
  • the transducer first retracts (fill cycle) and then expands.
  • the retraction, followed by expansion results in displacements at the transducer face, which are imposed at the end of the waveguide which is touching the transducer.
  • part of the end of the waveguide will be compressed elastically.
  • This initial compression will launch a compressional impulse along the waveguide with a speed equal to the speed of sound in the material of the waveguide.
  • the impulse will arrive at the distal end of the waveguide; it will, thus, alter the volume of the chamber and generate droplets.
  • An impulse, I is defined as a large force acting for a very short time which can never be rigorously realized in practice. However, it is useful to assume this case because it provides insight into the understanding of waveguide operation. Thus, as stated: lim I ⁇ ⁇ ⁇ t ⁇ o ⁇ t
  • the kinetic energy provided by unit impulse on the first end of the waveguide is derived as follows:
  • a When a mechanical impulse of amplitude, a, travels along a waveguide medium, it will have a particle velocity v at a time, t, and a displacement position, x.
  • the displacement, b, at a time, t, of a particle whose initial position is, x, will be:
  • the particle velocity is:
  • the KE of the whole wave system is:
  • the total energy of the impulse motion per unit volume is:
  • the varying compressional pressure P at any point relates to particle velocity in the medium as follows: (constant, depending on the material)
  • the energy loss from the guide into the environment is calculated by: where R is the total reflected energy from the environment surrounding the waveguide and the material of the waveguide, R 1 is the reflected energy from the material, and R 2 is the reflected energy in the environment surrounding the waveguide.

Landscapes

  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Ink Jet (AREA)
EP82300479A 1981-01-30 1982-01-29 Tintenstrahlgerät Expired EP0057594B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82300479T ATE14543T1 (de) 1981-01-30 1982-01-29 Tintenstrahlgeraet.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US22999281A 1981-01-30 1981-01-30
US229992 1981-01-30

Publications (3)

Publication Number Publication Date
EP0057594A2 true EP0057594A2 (de) 1982-08-11
EP0057594A3 EP0057594A3 (en) 1983-04-06
EP0057594B1 EP0057594B1 (de) 1985-07-31

Family

ID=22863533

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82300479A Expired EP0057594B1 (de) 1981-01-30 1982-01-29 Tintenstrahlgerät

Country Status (5)

Country Link
EP (1) EP0057594B1 (de)
JP (1) JPS57146665A (de)
AT (1) ATE14543T1 (de)
CA (1) CA1175359A (de)
DE (1) DE3264965D1 (de)

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4536097A (en) * 1983-02-22 1985-08-20 Siemens Aktiengesellschaft Piezoelectrically operated print head with channel matrix and method of manufacture
EP0107467A3 (en) * 1982-10-26 1986-02-05 Ing. C. Olivetti & C., S.P.A. Ink jet printing method and device
US11531395B2 (en) 2017-11-26 2022-12-20 Ultrahaptics Ip Ltd Haptic effects from focused acoustic fields
US11543507B2 (en) 2013-05-08 2023-01-03 Ultrahaptics Ip Ltd Method and apparatus for producing an acoustic field
US11550432B2 (en) 2015-02-20 2023-01-10 Ultrahaptics Ip Ltd Perceptions in a haptic system
US11553295B2 (en) 2019-10-13 2023-01-10 Ultraleap Limited Dynamic capping with virtual microphones
US11550395B2 (en) 2019-01-04 2023-01-10 Ultrahaptics Ip Ltd Mid-air haptic textures
US11656686B2 (en) 2014-09-09 2023-05-23 Ultrahaptics Ip Ltd Method and apparatus for modulating haptic feedback
US11704983B2 (en) 2017-12-22 2023-07-18 Ultrahaptics Ip Ltd Minimizing unwanted responses in haptic systems
US11715453B2 (en) 2019-12-25 2023-08-01 Ultraleap Limited Acoustic transducer structures
US11714492B2 (en) 2016-08-03 2023-08-01 Ultrahaptics Ip Ltd Three-dimensional perceptions in haptic systems
US11727790B2 (en) 2015-07-16 2023-08-15 Ultrahaptics Ip Ltd Calibration techniques in haptic systems
US11740018B2 (en) 2018-09-09 2023-08-29 Ultrahaptics Ip Ltd Ultrasonic-assisted liquid manipulation
US11742870B2 (en) 2019-10-13 2023-08-29 Ultraleap Limited Reducing harmonic distortion by dithering
US11816267B2 (en) 2020-06-23 2023-11-14 Ultraleap Limited Features of airborne ultrasonic fields
US11830351B2 (en) 2015-02-20 2023-11-28 Ultrahaptics Ip Ltd Algorithm improvements in a haptic system
US11842517B2 (en) 2019-04-12 2023-12-12 Ultrahaptics Ip Ltd Using iterative 3D-model fitting for domain adaptation of a hand-pose-estimation neural network
US11883847B2 (en) 2018-05-02 2024-01-30 Ultraleap Limited Blocking plate structure for improved acoustic transmission efficiency
US11886639B2 (en) 2020-09-17 2024-01-30 Ultraleap Limited Ultrahapticons
US11955109B2 (en) 2016-12-13 2024-04-09 Ultrahaptics Ip Ltd Driving techniques for phased-array systems
US12158522B2 (en) 2017-12-22 2024-12-03 Ultrahaptics Ip Ltd Tracking in haptic systems
US12373033B2 (en) 2019-01-04 2025-07-29 Ultrahaptics Ip Ltd Mid-air haptic textures
US12517585B2 (en) 2021-07-15 2026-01-06 Ultraleap Limited Control point manipulation techniques in haptic systems

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5830834B2 (ja) * 1975-02-13 1983-07-01 ソニー株式会社 インクプリント装置
DE2756134A1 (de) * 1977-12-16 1979-06-21 Ibm Deutschland Piezoelektrisch gesteuerte antriebsanordnung zur erzeugung hoher stossgeschwindigkeiten und/oder gesteuerter huebe
DE2808275C2 (de) * 1978-02-27 1983-03-10 NCR Corp., 45479 Dayton, Ohio Tintenstrahldruckkopf

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IBM TECHNICAL DISCLOSURE BULLETIN, Vol. 18, No. 2, July 1975, New York. J.L. MITCHELL et al: "Ink on demand printing and copying employing combined ultrasonic and electrostatic control", pages 608, 609 *

Cited By (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0107467A3 (en) * 1982-10-26 1986-02-05 Ing. C. Olivetti & C., S.P.A. Ink jet printing method and device
US4536097A (en) * 1983-02-22 1985-08-20 Siemens Aktiengesellschaft Piezoelectrically operated print head with channel matrix and method of manufacture
US12345838B2 (en) 2013-05-08 2025-07-01 Ultrahaptics Ip Ltd Method and apparatus for producing an acoustic field
US11543507B2 (en) 2013-05-08 2023-01-03 Ultrahaptics Ip Ltd Method and apparatus for producing an acoustic field
US11624815B1 (en) 2013-05-08 2023-04-11 Ultrahaptics Ip Ltd Method and apparatus for producing an acoustic field
US12204691B2 (en) 2014-09-09 2025-01-21 Ultrahaptics Ip Ltd Method and apparatus for modulating haptic feedback
US11656686B2 (en) 2014-09-09 2023-05-23 Ultrahaptics Ip Ltd Method and apparatus for modulating haptic feedback
US11768540B2 (en) 2014-09-09 2023-09-26 Ultrahaptics Ip Ltd Method and apparatus for modulating haptic feedback
US11550432B2 (en) 2015-02-20 2023-01-10 Ultrahaptics Ip Ltd Perceptions in a haptic system
US11830351B2 (en) 2015-02-20 2023-11-28 Ultrahaptics Ip Ltd Algorithm improvements in a haptic system
US11727790B2 (en) 2015-07-16 2023-08-15 Ultrahaptics Ip Ltd Calibration techniques in haptic systems
US12100288B2 (en) 2015-07-16 2024-09-24 Ultrahaptics Ip Ltd Calibration techniques in haptic systems
US11714492B2 (en) 2016-08-03 2023-08-01 Ultrahaptics Ip Ltd Three-dimensional perceptions in haptic systems
US12001610B2 (en) 2016-08-03 2024-06-04 Ultrahaptics Ip Ltd Three-dimensional perceptions in haptic systems
US12271528B2 (en) 2016-08-03 2025-04-08 Ultrahaptics Ip Ltd Three-dimensional perceptions in haptic systems
US11955109B2 (en) 2016-12-13 2024-04-09 Ultrahaptics Ip Ltd Driving techniques for phased-array systems
US11921928B2 (en) 2017-11-26 2024-03-05 Ultrahaptics Ip Ltd Haptic effects from focused acoustic fields
US11531395B2 (en) 2017-11-26 2022-12-20 Ultrahaptics Ip Ltd Haptic effects from focused acoustic fields
US12158522B2 (en) 2017-12-22 2024-12-03 Ultrahaptics Ip Ltd Tracking in haptic systems
US11704983B2 (en) 2017-12-22 2023-07-18 Ultrahaptics Ip Ltd Minimizing unwanted responses in haptic systems
US12347304B2 (en) 2017-12-22 2025-07-01 Ultrahaptics Ip Ltd Minimizing unwanted responses in haptic systems
US12370577B2 (en) 2018-05-02 2025-07-29 Ultrahaptics Ip Ltd Blocking plate structure for improved acoustic transmission efficiency
US11883847B2 (en) 2018-05-02 2024-01-30 Ultraleap Limited Blocking plate structure for improved acoustic transmission efficiency
US11740018B2 (en) 2018-09-09 2023-08-29 Ultrahaptics Ip Ltd Ultrasonic-assisted liquid manipulation
US12373033B2 (en) 2019-01-04 2025-07-29 Ultrahaptics Ip Ltd Mid-air haptic textures
US11550395B2 (en) 2019-01-04 2023-01-10 Ultrahaptics Ip Ltd Mid-air haptic textures
US11842517B2 (en) 2019-04-12 2023-12-12 Ultrahaptics Ip Ltd Using iterative 3D-model fitting for domain adaptation of a hand-pose-estimation neural network
US12191875B2 (en) 2019-10-13 2025-01-07 Ultraleap Limited Reducing harmonic distortion by dithering
US11742870B2 (en) 2019-10-13 2023-08-29 Ultraleap Limited Reducing harmonic distortion by dithering
US11553295B2 (en) 2019-10-13 2023-01-10 Ultraleap Limited Dynamic capping with virtual microphones
US12568341B2 (en) 2019-10-13 2026-03-03 Sim Ip Hxr Llc Dynamic capping with virtual microphones
US12002448B2 (en) 2019-12-25 2024-06-04 Ultraleap Limited Acoustic transducer structures
US11715453B2 (en) 2019-12-25 2023-08-01 Ultraleap Limited Acoustic transducer structures
US11816267B2 (en) 2020-06-23 2023-11-14 Ultraleap Limited Features of airborne ultrasonic fields
US12393277B2 (en) 2020-06-23 2025-08-19 Ultraleap Limited Features of airborne ultrasonic fields
US11886639B2 (en) 2020-09-17 2024-01-30 Ultraleap Limited Ultrahapticons
US12517585B2 (en) 2021-07-15 2026-01-06 Ultraleap Limited Control point manipulation techniques in haptic systems

Also Published As

Publication number Publication date
EP0057594A3 (en) 1983-04-06
ATE14543T1 (de) 1985-08-15
JPH0221946B2 (de) 1990-05-16
CA1175359A (en) 1984-10-02
JPS57146665A (en) 1982-09-10
EP0057594B1 (de) 1985-07-31
DE3264965D1 (en) 1985-09-05

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