Vibration wave radiating device

Patent metadata

Field	Value
Publication number	US-12580501-B2
Application number	US-202418404938-A
Country	US
Kind code	B2
Filing date	Jan 5, 2024
Priority date	Jul 26, 2021
Publication date	Mar 17, 2026
Grant date	Mar 17, 2026

Abstract

In a vibration wave radiating device, when a distance between a connection portion and a reflecting plane portion in a direction orthogonal to the reflecting plane portion is TD, an angle defined by a virtual line parallel to the reflecting plane portion and a back surface of a vibrating portion in a longitudinal section is θ, a shortest distance between a peripheral edge of the back surface at an end of the vibrating portion opposite to the connection portion and a peripheral edge of the reflecting plane portion is L, and a wavelength of a vibration wave emitted from the vibrating portion is λ, a relationship indicated by 0.78λ≤L≤1.19λ or 1.5λ≤L≤2.14λ is satisfied when TD=0 and 35°≤θ≤55°.

First claim

What is claimed is:

1 . A vibration wave radiating device comprising:
a vibrator to generate vibration; a vibrating body connected to the vibrator and including a front surface and a back surface closer to the vibrator and facing away from the front surface; and a reflecting plane portion facing the back surface of the vibrating body with a space therebetween; wherein the vibrating body includes a connection portion connected to the vibrator and a vibrating portion extending away from the reflecting plane portion and extending from an end portion of the connection portion opposite to the vibrator, the vibrating portion including the back surface facing the reflecting plane portion; the vibrating portion has a tubular shape linearly increasing in diameter from the connection portion in a longitudinal section; a peripheral edge of the reflecting plane portion is coaxial with a central axis of the vibrating portion and located outside the vibrating portion as viewed in a direction orthogonal to the reflecting plane portion; and when a distance between the connection portion and the reflecting plane portion in the direction orthogonal to the reflecting plane portion is TD, an angle defined by a virtual line parallel to the reflecting plane portion and the back surface of the vibrating portion in the longitudinal section is θ, a shortest distance between a peripheral edge of the back surface at an end of the vibrating portion opposite to the connection portion and the peripheral edge of the reflecting plane portion is L, and a wavelength of a vibration wave emitted from the vibrating portion is λ, a relationship indicated by 0.78λ≤L≤1.19λ or 1.5λ≤L≤2.14λ is satisfied when TD=0 and 35°≤θ≤55°.

2 . The vibration wave radiating device according to claim 1 , wherein a relationship indicated by 0.78λ≤L≤1.19λ or 1.5λ≤L≤2λ is satisfied when TD=0 and 35°≤θ≤55°.

3 . The vibration wave radiating device according to claim 1 , wherein the vibrator includes an electromechanical converter and a vibration transmitter.

4 . The vibration wave radiating device according to claim 3 , wherein the electromechanical converter includes one of a piezoelectric element, a magnetostrictive element, or an electrostrictive element.

5 . The vibration wave radiating device according to claim 1 , wherein the vibrator is one of a Langevin vibrator, a monomorph vibrator, or a bimorph vibrator.

Assignees

• Murata Manufacturing Co

Inventors

• Ito Ryota

Classifications

• H10N35/00

  Magnetostrictive devices (integrated devices or assemblies of multiple devices H10N39/00) · CPC title

• H10N30/20

  with electrical input and mechanical output, e.g. functioning as actuators or vibrators · CPC title

• H04R17/00

  Piezoelectric transducers; Electrostrictive transducers (piezoelectric or electrostrictive elements in general H10N30/00; details of piezoelectric or electrostrictive motors, generators or positioners {H10N30/00}) · CPC title

• H02N99/00 Primary

  Subject matter not provided for in other groups of this subclass · CPC title

• H04R1/34 Primary

  by using a single transducer with sound reflecting, diffracting, directing or guiding means {(specially adapted for hearing aids H04R25/402)} · CPC title