US-12627916-B2 - Vibration sensor

US12627916B2US 12627916 B2US12627916 B2US 12627916B2US-12627916-B2

Abstract

The present disclosure provides a vibration sensor including a vibration assembly including a mass element and an elastic element, a first acoustic chamber, an acoustic transducer, and a buffer member. In response to an external vibration signal, the vibration assembly vibrates such that a volume of the first acoustic chamber changes. The acoustic transducer is in communication with the first acoustic chamber. In response to a volume change of the first acoustic chamber, the acoustic transducer may generate an electrical signal. The buffer member is connected to the mass element or the elastic element. The buffer member reduces an impact force of the mass element acting on the elastic element during a vibration process of the vibration assembly. The acoustic transducer has a first resonance frequency, the vibration assembly has a second resonance frequency, and the second resonance frequency is less than the first resonance frequency.

Inventors

Yongshuai YUAN
Wenjun DENG
Yujia HUANG
Wenbing ZHOU
Fengyun LIAO
Xin Qi

Assignees

Shenzhen Shokz Co., Ltd.

Dates

Publication Date: 20260512
Application Date: 20230712
Priority Date: 20210618

Claims (20)

1 . A vibration sensor, comprising: a vibration assembly including a mass element and an elastic element, the mass element being connected to the elastic element; a first acoustic chamber, wherein the elastic element constitutes one of sidewalls of the first acoustic chamber, and in response to an external vibration signal, the vibration assembly vibrates such that a volume of the first acoustic chamber changes; an acoustic transducer being in communication with the first acoustic chamber, wherein in response to a volume change of the first acoustic chamber, the acoustic transducer generates an electrical signal; and a buffer member being connected to the mass element or the elastic element, the buffer member reducing an impact force of the mass element acting on the elastic element during a vibration process of the vibration assembly, wherein the acoustic transducer has a first resonance frequency, the vibration assembly has a second resonance frequency, and the second resonance frequency is less than the first resonance frequency; wherein the vibration assembly includes a plurality of groups of diaphragms and mass blocks, and for each group of the plurality of groups of diaphragms and mass blocks, a mass block is physically connected to a diaphragm, the plurality of groups of diaphragms and mass blocks are arranged at intervals along a vibration direction of the diaphragm.
2 . The vibration sensor of claim 1 , wherein the buffer member includes a buffer connection layer, the buffer connection layer is arranged between the mass element and the elastic element, and the mass element is fixed on the elastic element through the buffer member.
3 . The vibration sensor of claim 1 , wherein the vibration sensor includes a housing, and the housing receives the external vibration signal and transmits the external vibration signal to the vibration assembly, wherein the housing forms an acoustic chamber, the vibration assembly is located within the acoustic chamber and divides the acoustic chamber into the first acoustic chamber and a second acoustic chamber; the vibration assembly further includes a supporting member arranged along a circumferential direction of the elastic element, an end of the supporting member is connected to the elastic element, and another end of the supporting member is connected to the housing or the acoustic transducer.
4 . The vibration sensor of claim 3 , wherein the buffer member includes a first extension arm, the first extension arm is arranged on a surface of the elastic element where the mass element is arranged, and the first extension arm and the mass element are located at an inner side of the supporting member, and an end of the first extension arm is connected to the mass element, and the first extension arm is arranged in a spiral shape along the circumferential direction of the elastic element from the mass element to an edge of the elastic element.
5 . The vibration sensor of claim 4 , wherein the buffer member further includes a second extension arm, the second extension arm is arranged on the surface of the elastic element where the mass element is arranged, and the second extension arm is located at the inner side of the supporting member, and an end of the second extension arm is connected to the mass element, and the second extension arm is arranged in a spiral shape along the circumferential direction of the elastic element from the mass element to the edge of the elastic element.
6 . The vibration sensor of claim 3 , wherein the buffer member includes a cantilever beam, an end of the cantilever beam is connected to the supporting member, and another end of the cantilever beam is connected to the mass element.
7 . The vibration sensor of claim 6 , wherein a thickness of the cantilever beam along the vibration direction of the vibration assembly is less than a thickness of the mass element along the vibration direction of the vibration assembly.
8 . The vibration sensor of claim 6 , wherein a gap exists between the cantilever beam and the mass element.
9 . The vibration sensor of claim 1 , wherein the vibration assembly includes a plurality of mass elements, the plurality of mass elements are connected to the elastic element, a count of the plurality of mass elements is greater than or equal to 3, and the plurality of mass elements are in a non-collinear arrangement.
10 . The vibration sensor of claim 1 , wherein at least two groups of the plurality of groups of diaphragms and mass blocks have different resonance frequencies.
11 . The vibration sensor of claim 1 , wherein the elastic element is arranged opposite to the acoustic transducer, a side of the elastic element facing the first acoustic chamber is arranged with a convex structure, the elastic element drives the convex structure to move in response to the external vibration signal, and the movement of the convex structure changes the volume of the first acoustic chamber.
12 . The vibration sensor of claim 11 , wherein the convex structure abuts against a sidewall of the first acoustic chamber opposite to the elastic element.
13 . The vibration sensor of claim 12 , wherein the convex structure has elasticity, in response to the movement of the convex structure, the convex structure generates an elastic deformation, and the elastic deformation changes the volume of the first acoustic chamber.
14 . The vibration sensor of claim 1 , wherein the vibration assembly further includes a supporting member, the mass element and the supporting member are physically connected to two sides of the elastic element respectively, the supporting member is physically connected to the acoustic transducer, and the supporting member, the elastic element, and the acoustic transducer form the first acoustic chamber.
15 . The vibration sensor of claim 14 , wherein an area of a cross-section of the mass element perpendicular to the vibration direction of the vibration assembly is greater than an area of a cross-section of the first acoustic chamber perpendicular to the vibration direction of the vibration assembly, an area of a cross-section of the elastic element perpendicular to the vibration direction of the vibration assembly is greater than the area of the cross-section of the first acoustic chamber perpendicular to the vibration direction of the vibration assembly, and the mass element is configured to cause a compression deformation of a region where the elastic element contacts with the supporting member in response to the external vibration signal, and the elastic element vibrates to change the volume of the first acoustic chamber.
16 . The vibration sensor of claim 15 , wherein the supporting member includes a ring structure, the area of the cross-section of the mass element perpendicular to the vibration direction of the vibration assembly is greater than or equal to an area of a cross-section of an outer ring of the ring structure perpendicular to the vibration direction of the vibration assembly, and the area of the cross-section of the elastic element perpendicular to the vibration direction of the vibration assembly is greater than or equal to the area of the cross-section of the outer ring of the ring structure perpendicular to the vibration direction of the vibration assembly.
17 . The vibration sensor of claim 16 , wherein the area of the cross-section of the mass element perpendicular to the vibration direction of the vibration assembly is equal to the area of the cross-section of the elastic element perpendicular to the vibration direction of the vibration assembly.
18 . The vibration sensor of claim 1 , wherein each group of the plurality of groups of diaphragms and mass blocks correspond to a target frequency band in one or more different target frequency bands, and a sensitivity of the vibration sensor in a corresponding target frequency band is greater than a sensitivity of the acoustic transducer.
19 . The vibration sensor of claim 1 , wherein the mass element in each group of diaphragms and mass blocks includes a plurality of mass elements, and the plurality of mass elements are arranged on two sides of the elastic element, respectively.
20 . The vibration sensor of claim 1 , wherein in the plurality of groups of diaphragms and mass blocks, the diaphragm farthest from the acoustic transducer is configured not to allow air to pass through.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of International Application No. PCT/CN2021/138440, filed on Dec. 15, 2021, which claims priority to Chinese Patent Application No. 202110677119.2, filed on Jun. 18, 2021, International Application No. PCT/CN2021/106947, filed on Jul. 16, 2021, Chinese Patent Application No. 202110917789.7, filed on Aug. 11, 2021, International Application No. PCT/CN2021/112014, filed on Aug. 11, 2021, International Application No. PCT/CN2021/112017, filed on Aug. 11, 2021, and International Application No. PCT/CN2021/113419, filed on Aug. 19, 2021, the contents of each of which are hereby incorporated by reference. TECHNICAL FIELD The present disclosure relates to the acoustic field, and in particular, relates to a vibration sensor. BACKGROUND A vibration sensor is one of the commonly used vibration detection devices. The vibration sensor converts collected vibration signals into output electrical signals or other forms of information through its internal transducer member. Sensitivity can indicate a ratio of an output signal strength to an input signal strength of a sensor device. If the sensitivity is too small, it may affect the user experience. In order to improve the user experience, a mass of a vibration pickup member (such as a mass block) in the vibration sensor is usually set larger, so that a resonance peak of the vibration sensor moves to a low frequency to improve a low-frequency sensitivity of the vibration sensor. However, due to the larger mass of the mass block, the impact of the mass block on a diaphragm during a vibration process of the vibration pickup member is also relatively large, which is easy to damage the diaphragm and affects the reliability of the vibration sensor. Thus, it is desirable to provide a vibration sensor that is able to improve the reliability of the vibration sensor. SUMMARY An aspect of the present disclosure provides a vibration sensor. The vibration sensor may include a vibration assembly including a mass element and an elastic element. The mass element may be connected to the elastic element. The vibration sensor may also include a first acoustic chamber. The elastic element may constitute one of sidewalls of the first acoustic chamber, and in response to an external vibration signal, the vibration assembly vibrates such that a volume of the first acoustic chamber changes. The vibration sensor may also include an acoustic transducer being in communication with the first acoustic chamber. In response to a volume change of the first acoustic chamber, the acoustic transducer may generate an electrical signal. The vibration sensor may further include a buffer member being connected to the mass element or the elastic element. The buffer member may reduce an impact force of the mass element acting on the elastic element during a vibration process of the vibration assembly. The acoustic transducer may have a first resonance frequency, the vibration assembly may have a second resonance frequency, and the second resonance frequency may be less than the first resonance frequency. In some embodiments, at a frequency less than 1000 Hz, a sensitivity of the vibration assembly may be greater than or equal to −40 dB. In some embodiments, the second resonance frequency may be 1 kHz˜10 kHz less than the first resonance frequency. In some embodiments, the vibration sensor may include a housing, and the housing may receive the external vibration signal and transmit the external vibration signal to the vibration assembly. In some embodiments, the housing may form an acoustic chamber, and the vibration assembly may be located within the acoustic chamber and divide the acoustic chamber into the first acoustic chamber and a second acoustic chamber. In some embodiments, the buffer member may include a buffer connection layer. The buffer connection layer may be arranged between the mass element and the elastic element, and the mass element may be fixed on the elastic element through the buffer member. In some embodiments, the buffer connection layer may include an elastic connection sheet and an adhesive layer wrapped an outside of the elastic connection sheet. In some embodiments, a Young's modulus of the buffer connection layer may be within a range of 0.01 MPa-100 MPa. In some embodiments, the buffer member may include a buffer adhesive layer, and the buffer adhesive layer may be arranged on a region of the elastic element excluding a region corresponding to a projection region of the mass element along a vibration direction. In some embodiments, the buffer adhesive layer and the mass element may be located at a same side and/or opposite sides of the elastic element. In some embodiments, the vibration assembly further may include a supporting member arranged along a circumferential direction of the elastic element. An end of the supporting member may be connected to the elastic element, and another end of the supporting member