# US 12,192,701 B2 · Ultrasonic generator > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,192,701 B2 - Document ID: US12192701B2 - Status: Granted - Kind: B2 - Application number: 17/887,044 - Filed: 2022-08-12 - Published: 2023-02-23 - Granted: 2025-01-07 - Earliest claimed: 2021-08-17 - Assignees: Denso Corporation; Toyota Jidosha Kabushiki Kaisha; MIRISE Technologies Corporation - Applicants: Denso Corporation; Toyota Jidosha Kabushiki Kaisha; MIRISE Technologies Corporation - Inventors: Hiromichi Kato; Nobuyuki Otake; Takashi Inoue; Takayuki Shibata - Web page: https://patentgrep.com/patent/US12192701B2 ## CPC - B06B 1/0622: {on one surface} - H04R 17/00: Piezoelectric transducers; Electrostrictive transducers (piezoelectric or electrostrictive elements in general H10N30/00; details of piezoelectric or electrostrictive motors, generators or positioners {H10N30/00}) - B06B 1/0207: {Driving circuits (specially adapted for particular applications, see the relevant subclass, e.g. G01; circuits for steering transducer arrays G10K11/34; basic circuits H03)} - B06B 2201/20: Application to multi-element transducer - H04R 2201/003: Mems transducers or their use - H04R 2499/13: Acoustic transducers and sound field adaptation in vehicles - B06B: METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, {e.g.} FOR PERFORMING MECHANICAL WORK IN GENERAL (for particular applications, see the relevant subclasses, e.g. B07B1/40, B23Q17/12, B24B31/06; measurement of mechanical vibrations G01H; in direction finding, locating, distance or velocity measuring G01S; {generating seismic energy G01V1/02}; control of mechanical vibrations in general G05D; sound-producing devices, e.g. bells, sirens, whistles G10K, {e.g. methods or devices for transmitting, conducting, or directing sound in general G10K11/00}; generation of electrical oscillations H03B; electromechanical resonators in general H03H; electromechanical transducers {for communication techniques, e.g. microphones, speakers} H04R) - H04R: LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS (producing sounds with frequency not determined by supply frequency G10K) ## Abstract An ultrasonic generator has a speaker element having a first resonance frequency and a speaker element having a second resonance frequency. The first resonance frequency and the second resonance frequency are adjacent resonance frequencies in the speaker. The distance between the elements is set so that the sound from the first speaker element and the sound from the second speaker element have a predetermined relationship at a target position. The target position is two or more positions on the object located in the target space. A predetermined relationship is a relationship in which a sound from the first speaker element and a sound from the second speaker element strengthen each other at an intermediate frequency between the first resonance frequency and the second resonance frequency. ## Claims ### Claim 1 An ultrasonic generator which radiates sound waves toward a target space, comprising: a plurality of speaker elements which are piezoelectric micro electro mechanical systems ultrasonic transducers, wherein the plurality of speaker elements includes: a first speaker element having a first resonance frequency; and a second speaker element having a second resonance frequency adjacent to the first resonance frequency, wherein the first speaker element and the second speaker element are arranged apart from each other in a direction intersecting with a direction toward the target space, and wherein a distance between the first speaker element and the second speaker element is set so that a strengthening relationship of sounds having an intermediate frequency from the first speaker element and from the second speaker element appear at two or more positions on an object located in the target space, and wherein the strengthening relationship is created by strengthening a sound having the intermediate frequency between the first resonance frequency and the second resonance frequency from the first speaker element and a sound having the intermediate frequency from the second speaker element, and wherein the distance is set equal to or more than a value 2z obtained from an equation n=(SQRT ((z+x)2+y2)-SQRT ((z−x)2+y2))/λmid+½) where n is the natural number equal to or more than 1, z is a distance between a midpoint between two speaker element and one of the speaker elements, x is a width of the object, y is a distance between the midpoint and the object, and Amid is a wavelength of the intermediate frequency. ### Claim 2 (depends on 1) The ultrasonic generator claimed in claim 1, further comprising: a semiconductor substrates made of continuous material, wherein both the first speaker element and the second speaker element are formed on the semiconductor substrate. ### Claim 3 (depends on 1) The ultrasonic generator claimed in claim 1, further comprising: a first semiconductor substrate and a second semiconductor substrate arranged apart from each other, wherein the first speaker element is formed on the first semiconductor substrate, and the second speaker element is formed on the second semiconductor substrate. ### Claim 4 (depends on 1) The ultrasonic generator claimed in claim 1, wherein the plurality of speaker elements forms a plurality of speaker pairs. ### Claim 5 (depends on 4) The ultrasonic generator claimed in claim 4, wherein the plurality of speaker pairs have different central axes that intersect each other. ### Claim 6 (depends on 4) The ultrasonic generator claimed in claim 4, wherein the plurality of the speaker pairs includes: a first speaker pair characterized by a first intermediate frequency; and second speaker pair characterized by a second intermediate frequency higher than the first intermediate frequency, wherein the second speaker pair is arranged inside the first speaker pair. ### Claim 7 (depends on 1) The ultrasonic generator claimed in claim 1, wherein the first speaker element and the second speaker element are arranged sufficiently apart from each other with respect to a wavelength of the intermediate frequency. ### Claim 8 (depends on 1) The ultrasonic generator claimed in claim 1, wherein the distance is set equal to or more than a value 2z obtained from an equation 2z=0.85×λmid, where the object is a human face, n is the natural number of 1 or more, and z is a distance between a midpoint between two speaker elements and one of the speaker elements. ### Claim 9 (depends on 8) The ultrasonic generator claimed in claim 8, wherein the distance is set to be equal to or less than a width of the target space.