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公开(公告)号：US11727790B2
公开(公告)日：2023-08-15
申请号：US17080840
申请日：2020-10-27
Applicant: ULTRAHAPTICS IP LTD
Abstract: A system providing various improved calibration techniques for haptic feedback is described. An acoustic field is defined by one or more control points in a space within which the acoustic field may exist. Each control point is assigned an amplitude value equating to a desired amplitude of the acoustic field at the control point. Because complete control of space is not possible, controlling the acoustic field at given points yields erroneous local maxima in the acoustic field levels at other related positions. In relation to mid-air haptic feedback, these can interfere in interactions with the space by creating secondary effects and ghost phenomena that can be felt outside the interaction area. The level and nature of the secondary maxima in the acoustic field is determined by how the space is controlled. By arranging the transducer elements in different ways, unwanted effects on the acoustic field can be limited and controlled.
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公开(公告)号：US11704983B2
公开(公告)日：2023-07-18
申请号：US16229091
申请日：2018-12-21
Applicant: ULTRAHAPTICS IP LTD
Inventor： Benjamin John Oliver Long , Brian Kappus
CPC classification number: G08B6/00 , G10K11/346 , H04R1/40
Abstract: Disclosed are methods to manipulate a given parametrized haptic curve in order to yield a smooth phase function for each acoustic transducer which minimizes unwanted parametric audio. Further, the impulse response of a haptic system describes the behavior of the system over time and can be convolved with a given input to simulate a response to that input. To produce a specific response, a deconvolution with the impulse response is necessary to generate an input.
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公开(公告)号：US20230117919A1
公开(公告)日：2023-04-20
申请号：US18066267
申请日：2022-12-14
Applicant: ULTRAHAPTICS IP LTD
Inventor： Michele Iodice , Brian Kappus , Benjamin John Oliver Long
IPC: G06F3/01 , G06F3/03 , G10K11/34 , G06F3/038 , G06F3/0354
Abstract: To resolve an issue related to the calibration of optical cameras in transducer-based mid-air haptic systems, the magnification of the motion induced on an optical camera by an acoustic field modulated at specific frequencies reveals very small temporal variations in video frames. This quantized distortion is used to compare different acoustic fields and to solve the calibration problem in an automatized manner. Further, mechanical resonators may be excited by ultrasound when it is modulated at the resonant frequency. When enough energy is transferred and when operating at the correct frequency, a user in contact with the device can feel vibration near areas of largest displacement. This effect can be exploited to create devices which can produce haptic feedback while not carrying a battery or exciter when in the presence of an ultrasonic source.
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公开(公告)号：US20230095030A1
公开(公告)日：2023-03-30
申请号：US18060525
申请日：2022-11-30
Applicant: Ultrahaptics IP Ltd
Inventor： Benjamin John Oliver Long , Thomas Andrew Carter , Sriram Subramanian
Abstract: The present invention concerns a method and apparatus for the modulation of an acoustic field for providing tactile sensations. A method of creating haptic feedback using ultrasound is provided. The method comprises the steps of generating a plurality of ultrasound waves with a common focal point using a phased array of ultrasound transducers, the common focal point being a haptic feedback point, and modulating the generation of the ultrasound waves using a waveform selected to produce little or no audible sound at the haptic feedback point.
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公开(公告)号：US11543507B2
公开(公告)日：2023-01-03
申请号：US16404660
申请日：2019-05-06
Applicant: Ultrahaptics IP Ltd
Inventor： Thomas Andrew Carter , Benjamin John Oliver Long , Sriram Subramanian
Abstract: The present invention concerns a method and apparatus for the modulation of an acoustic field for providing tactile sensations. A method of creating haptic feedback using ultrasound is provided. The method comprises the steps of generating a plurality of ultrasound waves with a common focal point using a phased array of ultrasound transducers, the common focal point being a haptic feedback point, and modulating the generation of the ultrasound waves using a waveform selected to produce little or no audible sound at the haptic feedback point.
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Patent Agency Ranking
公开(公告)号：US11378997B2
公开(公告)日：2022-07-05
申请号：US16600496
申请日：2019-10-12
Applicant: ULTRAHAPTICS IP LTD
Inventor： Benjamin John Oliver Long , Rafel Jibry
Abstract: Phased array systems rely on the production of an exact carrier frequency to function. Reconstructing digital signals by specified amplitude and phase is accomplished explicitly by inducing frequency shifts away from a base frequency implied by phase changes. Shifting the carrier frequency of a digitally controlled phased array while preserving the timing of the individual phase pulses enables more efficient driving of the phased array system when the phase of the drive signals change dynamically in time.
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公开(公告)号：US20210225355A1
公开(公告)日：2021-07-22
申请号：US17195795
申请日：2021-03-09
Applicant: Ultrahaptics IP Ltd
Inventor： Benjamin John Oliver Long , Philip Edwin Jones
Abstract: Various techniques for driving phased array systems are described, specifically intended for acoustic phased arrays with applications to mid-air haptics, parametric audio, acoustic levitation and acoustic imaging, including a system: 1) that is capable of mitigating the effect of the changes in the air to provide a consistent haptic experience; 2) that produces trap points in air; 3) that defines phased-array optimization in terms of vectors for the production of more consistent haptic effects; 4) that defines one or more control points or regions in space via a controlled acoustic field; 5) that uses a reduced representation method for the construction of acoustic basis functions; 6) that performs efficient evaluation of complex-valued functions for a large quantity of throughput; 7) that generates a Krylov sub-space of a matrix; and 8) that maximizes an objective described by different control points and/or regions to those used to create the acoustic basis functions.
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公开(公告)号：US10943578B2
公开(公告)日：2021-03-09
申请号：US15839184
申请日：2017-12-12
Applicant: Ultrahaptics IP Ltd
Inventor： Benjamin John Oliver Long
Abstract: Various techniques for driving phased array systems are described, specifically intended for acoustic phased arrays with applications to mid-air haptics, parametric audio, acoustic levitation and acoustic imaging, including a system: 1) that is capable of mitigating the effect of the changes in the air to provide a consistent haptic experience; 2) that produces trap points in air; 3) that defines phased-array optimization in terms of vectors for the production of more consistent haptic effects; 4) that defines one or more control points or regions in space via a controlled acoustic field; 5) that uses a reduced representation method for the construction of acoustic basis functions; 6) that performs efficient evaluation of complex-valued functions for a large quantity of throughput; 7) that generates a Krylov sub-space of a matrix; and 8) that maximizes an objective described by different control points and/or regions to those used to create the acoustic basis functions.
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公开(公告)号：US10911861B2
公开(公告)日：2021-02-02
申请号：US16401148
申请日：2019-05-02
Applicant: ULTRAHAPTICS IP LTD
Inventor： Justin Rorke Buckland , Adam John Robert Jackson , Amaru Daniel Araya-Williams , Benjamin John Oliver Long , Brian Kappus
Abstract: An acoustic matching structure is used to increase the power radiated from a transducing element with a higher impedance into a surrounding acoustic medium with a lower acoustic impedance. The acoustic matching structure consists of a thin, substantially planar cavity bounded by a two end walls and a side wall. The end walls of the cavity are formed by a blocking plate wall and a transducing element wall separated by a short distance (less than one quarter of the wavelength of acoustic waves in the surrounding medium at the operating frequency). The end walls and side wall bound a cavity with diameter approximately equal to half of the wavelength of acoustic waves in the surrounding medium. In operation, a transducing element generates acoustic oscillations in the fluid in the cavity. The transducing element may be an actuator which generates motion of an end wall in a direction perpendicular to the plane of the cavity to excite acoustic oscillations in the fluid in the cavity, and the cavity geometry and resonant amplification increase the amplitude of the resulting pressure oscillation. The cavity side wall or end walls contain at least one aperture positioned away from the center of the cavity to allow pressure waves to propagate into the surrounding acoustic medium.
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公开(公告)号：US20200218354A1
公开(公告)日：2020-07-09
申请号：US16734479
申请日：2020-01-06
Applicant: ULTRAHAPTICS IP LTD
Inventor： David Beattie , Rory Clark , Adam Harwood , Orestis Georgiou , Benjamin John Oliver Long , Thomas Andrew Carter
Abstract: Described is a method for instilling the haptic dimension of texture to virtual and holographic objects using mid-air ultrasonic technology. A set of features is extracted from imported images using their associated displacement maps. Textural qualities such as the micro and macro roughness are then computed and fed to a haptic mapping function together with information about the dynamic motion of the user's hands during holographic touch. Mid-air haptic textures are then synthesized and projected onto the user's bare hands. Further, mid-air haptic technology enables tactile exploration of virtual objects in digital environments. When a user's prior and current expectations and rendered tactile texture differ, user immersion can break. A study aims at mitigating this by integrating user expectations into the rendering algorithm of mid-air haptic textures and establishes a relationship between visual and mid-air haptic roughness.
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