CN112543399B

CN112543399B - Vibrating diaphragm assembly and loudspeaker

Info

Publication number: CN112543399B
Application number: CN202011375726.5A
Authority: CN
Inventors: 徐增强; 张志兵
Original assignee: Goertek Inc
Current assignee: Goertek Inc
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2023-08-18
Anticipated expiration: 2040-11-30
Also published as: CN112543399A; WO2022111366A1

Abstract

The embodiment of the application provides a vibrating diaphragm assembly and a loudspeaker, wherein the vibrating diaphragm assembly is applied to the loudspeaker. The vibrating diaphragm assembly comprises a folded ring part and a ceramic dome, wherein the ceramic dome is arranged in a hollow area of the folded ring part, a plurality of through holes are formed in the ceramic dome in the thickness direction of the ceramic dome, the aperture range of each through hole is 2-25 mu m, and the thickness range of the ceramic dome is 50-200 mu m. According to the vibrating diaphragm assembly provided by the embodiment of the application, the through holes are formed in the thickness direction of the ceramic dome, so that the pressure difference at two sides of the ceramic dome can be obviously reduced when the loudspeaker produces sound, the influence of the excessive internal pressure of the loudspeaker on the components such as the internal sensor of the loudspeaker is avoided, and the stable performance and the service life of the loudspeaker are ensured.

Description

Vibrating diaphragm assembly and loudspeaker

Technical Field

The application belongs to the technical field of electroacoustic materials, and particularly relates to a vibrating diaphragm assembly and a loudspeaker.

Background

In recent years, with the increasing demands of users for sound production of sound production devices, more and more sound production devices are developed in the direction of high power and high sound quality, and further demands are made on the internal components of the sound production devices.

Wherein, the dome is as the core component part of vibrating diaphragm subassembly in the sound generating mechanism, has directly influenced sound quality of sound generating mechanism. As is known in the art, the dome must have sufficient stiffness and toughness to withstand the intense reciprocating motion, achieving superior high frequency acoustic characteristics. However, in order to ensure rigidity and toughness, the conventional dome is generally of an integral plate-shaped structure, so that the pressure difference at two sides of the diaphragm assembly is overlarge in the sounding process of the sounding device, and the overlarge pressure difference can affect or even damage the pressure sensor inside the sounding device and the assembly with weaker structural strength.

Disclosure of Invention

An object of the embodiment of the application is to provide a new technical scheme of a vibrating diaphragm assembly and a loudspeaker.

According to a first aspect of an embodiment of the present application, there is provided a diaphragm assembly, for use in a loudspeaker, including:

the ceramic ball top is arranged in a hollow area of the folded ring part;

the ceramic dome is provided with a plurality of through holes in the thickness direction, the aperture range of the through holes is 2-25 mu m, and the thickness range of the ceramic dome is 50-200 mu m.

Optionally, the pore diameter of the through hole ranges from 10 μm to 20 μm.

Optionally, a plurality of through holes are distributed on the ceramic dome in an array.

Optionally, the distance between adjacent through holes is 0.5-2 times the aperture of the through holes.

Optionally, the material of the ceramic dome includes at least one of alumina, silica, and silicon carbide.

Optionally, the ceramic dome is formed by injection molding, sheet printing or extrusion molding.

Optionally, the porosity of the ceramic dome ranges from 40% to 75%.

According to a second aspect of an embodiment of the present application, there is provided a loudspeaker including a magnetic circuit assembly, a voice coil, and a diaphragm assembly according to the first aspect;

one end of the voice coil is connected with the vibrating diaphragm assembly, and the other end of the voice coil is positioned in the magnetic gap of the magnetic circuit assembly.

Optionally, under the condition that the loudspeaker is in a sounding state, the pressure difference range of two sides of the ceramic dome is 50-1000Pa.

Optionally, a sensor assembly is disposed within the speaker.

One technical effect of the embodiment of the application is that:

the embodiment of the application provides a vibrating diaphragm assembly, which comprises a folded ring part and a ceramic dome, wherein the ceramic dome is arranged in a hollow area of the folded ring part, a plurality of through holes are formed in the ceramic dome in the thickness direction of the ceramic dome, the aperture range of the through holes is 2-25 mu m, and the thickness range of the ceramic dome is 50-200 mu m. According to the vibrating diaphragm assembly provided by the embodiment of the application, the through holes are formed in the thickness direction of the ceramic dome, so that air flows at two sides of the vibrating diaphragm can circulate through the through holes, the pressure difference at two sides of the vibrating diaphragm assembly can be obviously reduced when the loudspeaker sounds, and the performance stability and the service life of the loudspeaker are ensured.

Other features of the present application and its advantages will become apparent from the following detailed description of exemplary embodiments of the application, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description, serve to explain the principles of the application.

FIG. 1 is a schematic view of a ceramic dome according to an embodiment of the present application;

FIG. 2 is a partial top view of a ceramic dome according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a speaker according to an embodiment of the present application.

Wherein: 1-ceramic dome; 101-a through hole; 2-a ring folding part; 11-a diaphragm assembly; 12-a voice coil; 13-magnetic circuit assembly.

Detailed Description

Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise.

The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses.

Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

Referring to fig. 1 to 3, an embodiment of the present application provides a diaphragm assembly 11, which is applied to a speaker, where the diaphragm assembly 11 includes a ring-folded portion 2 and a ceramic dome 1, where the ceramic dome 1 is disposed in a hollow area of the ring-folded portion 2, specifically, the ceramic dome 1 is disposed along a radial direction of the ring-folded portion 2, an edge of the ceramic dome 1 is connected to the ring-folded portion 2, and the ceramic dome 1 covers the hollow area of the ring-folded portion 2 and is connected to an upper side or a lower side of the ring-folded portion 2. The ceramic dome 1 is provided with a plurality of through holes 101 in the thickness direction thereof, the aperture range of the through holes 101 is 2-25 μm, and the thickness range of the ceramic dome 1 is 50-200 μm.

Specifically, the ceramic dome 1 and the folded ring portion 2 may be bonded, so as to improve the convenience of connection between the ceramic dome 1 and the folded ring portion 2 on the basis of ensuring the connection strength between the ceramic dome 1 and the folded ring portion 2.

Specifically, the ceramic dome 1 is generally a planar plate-like structure or a spherical plate-like structure, and the ceramic dome 1 is provided with a plurality of through holes 101 in the thickness direction of the plate-like structure thereof. Referring to fig. 1, the ceramic dome 1 is a planar plate structure, and the planar plate structure of the ceramic dome 1 may include an upper surface and a lower surface, and the plurality of through holes 101 are perpendicular to the surface of the ceramic dome 1, that is, the plurality of through holes 101 penetrate through the upper surface and the lower surface of the ceramic dome 1 and are perpendicular to the upper surface and the lower surface. Under the condition that the loudspeaker is in a sounding state, the through holes 101 can facilitate circulation of sound air currents at two sides of the ceramic dome 1, pressure difference at two sides of the ceramic dome 1 is reduced, namely pressure inside the loudspeaker can be reduced, and influence of excessive pressure on components such as sensors inside the loudspeaker is avoided.

The aperture of the through-hole 101 is in the range of 2-25 μm, and preferably the aperture of the through-hole 101 is in the range of 10-20 μm. The pore diameter of the through hole 101 is selected by combining the flow-through property of the sound air flow on both sides of the ceramic dome 1 and the water resistance of the ceramic dome 1. Specifically, when the aperture of the through hole 101 is too large, although the sound air flows on both sides of the ceramic dome 1 can flow smoothly, that is, the sound air flows on both sides of the ceramic dome 1 have good flow, water drops outside the speaker may enter the speaker through the through hole 101, and there is a risk of corroding the internal components of the speaker; and when the aperture of the through hole 101 is too small, although the ceramic dome 1 can provide better waterproof performance for the speaker, the sound air flows on both sides of the ceramic dome 1 are difficult to smoothly circulate, and the pressure difference on both sides of the ceramic dome 1 is too large, so that the pressure in the speaker is too large, which may affect the normal operation of the components such as the sensor inside the speaker. In the embodiment of the application, when the aperture range of the through hole 101 is controlled to be 2-25 μm, or more preferably 10-20 μm, the ceramic dome 1 can improve the waterproof performance of the speaker on the basis of reducing the pressure difference at two sides of the ceramic dome, so that the waterproof performance of the speaker can be realized under the condition of 15m water depth for 30 min.

In addition, the thickness of the ceramic dome 1 ranges from 50 to 200 μm. The thickness of the ceramic dome 1 has a great influence on the acoustic performance of sound generating devices such as loudspeakers. In general, when the thickness of the ceramic dome 1 is low, although the vibration sensitivity of the ceramic dome 1 can be improved, the reliability of the ceramic dome 1 is lowered; while the ceramic dome 1 has a larger thickness, the ceramic dome 1 has a reduced sensitivity, although the structural reliability of the ceramic dome 1 can be improved. According to the embodiment of the application, the thickness of the ceramic dome 1 is controlled within the range of 50-200 mu m, the thickness of the ceramic dome 1 is preferably 80-150 mu m, and the thickness control of the ceramic dome 1 can be performed on the basis of ensuring the reliability of the ceramic dome 1, namely, the elasticity and rigidity of the ceramic dome 1 can meet the manufacturing requirements of sound-producing devices such as a loudspeaker, and the service life and sensitivity of the ceramic dome 1 are ensured.

According to the vibrating diaphragm assembly provided by the embodiment of the application, the through holes 101 are formed in the thickness direction of the ceramic dome 1, so that the pressure difference at two sides of the ceramic dome 1 can be obviously reduced when the loudspeaker produces sound, the influence of the excessive internal pressure of the loudspeaker on the components such as the internal sensor and the like is avoided, and the stable performance and the service life of the loudspeaker are ensured.

Optionally, a plurality of through holes 101 are distributed on the ceramic dome 1 in an array.

Specifically, the array distribution of the plurality of through holes 101 may be a square array, a triangular array or an inclined array, as shown in fig. 1 and 2, and the plurality of through holes 101 are distributed on the ceramic dome 1 in an inclined array manner. The distribution of the array of the plurality of through holes 101 can improve the uniformity of the distribution of the through holes 101, so as to improve the uniformity of the sound airflow circulation at the two sides of the ceramic dome 1, and avoid the overlarge pressure difference at the two sides of the ceramic dome 1.

Optionally, the distance between adjacent through holes 101 is 0.5-2 times the aperture of the through holes 101.

Specifically, in order to avoid stress concentration on the peripheral side of the through-hole 101, the through-hole 101 may be provided as a circular through-hole, and the degree of the densely provided through-hole 101 on the ceramic dome 1 may be determined according to the distance between adjacent through-holes 101 and the aperture relationship of the through-hole 101. Under the condition that the distance between the adjacent through holes 101 is 0.5-2 times of the aperture of the through holes 101, the density degree of the through holes 101 arranged on the ceramic dome 1 is moderate, so that on one hand, the pressure difference at two sides of the ceramic dome 1 is not excessive, and on the other hand, the structural strength and stability of the ceramic dome 1 during vibration can be improved.

Optionally, the material of the ceramic dome 1 includes at least one of alumina, silica, and silicon carbide. The ceramic dome 1 made of the above material has the advantages of light weight, high structural strength, good vibration stability, etc., and the ceramic dome 1 can still maintain high strength in the case that a plurality of through holes 101 are formed in the ceramic dome 1 made of the above material. In addition, the porosity of the ceramic dome 1, that is, the ratio of the volume of the through hole 101 to the entire volume of the ceramic dome 1, ranges from 40% to 75%, preferably from 50% to 70%. The specific set value of the porosity needs to be comprehensively determined according to the pressure difference at two sides of the ceramic dome 1 and the structural strength of the ceramic dome 1, and the comparison of the embodiment of the application is not limited.

Optionally, the ceramic dome 1 is formed by injection molding, sheet printing molding or extrusion molding.

Specifically, the preparation method of the ceramic dome 1 generally includes the following steps:

1. mixing the raw materials of the ceramic dome 1;

2. molding the mixed raw materials in a molding device;

3. and drying and sintering the formed raw materials to obtain the ceramic dome 1 product.

In a specific preparation method, the raw materials of the ceramic dome 1 comprise alumina powder and urea, after the alumina powder and the urea are uniformly mixed, the ceramic dome 1 can be injection molded at the temperature of 300 ℃ or below, and finally the ceramic dome 1 with the through hole 101 is obtained after heat preservation for 30min at the temperature of 150 ℃ and the aperture of the through hole 101 is about 10 mu m; in another specific preparation method, the ceramic dome 1 is prepared from alumina powder, silica powder and ammonium bicarbonate by uniformly mixing the alumina powder, the silica powder and the ammonium bicarbonate, performing injection molding under the condition of bearing the temperature within 90 ℃, and finally performing heat preservation for 30min under the condition of 150 ℃ to obtain the ceramic dome 1 with the through holes 101, wherein the pore diameter of the through holes 101 is about 12 mu m.

The embodiment of the application also provides a loudspeaker, referring to fig. 3, the loudspeaker comprises a magnetic circuit assembly 13, a voice coil 12 and the diaphragm assembly 11;

one end of the voice coil 12 is connected with the diaphragm assembly 11, and the other end of the voice coil 12 is positioned in the magnetic gap of the magnetic circuit assembly 13.

Specifically, when the voice coil 12 is energized, an interaction magnetic force is generated between the magnetic circuit assembly 13 and the voice coil 12, and the voice coil 12 drives the diaphragm assembly 11 to vibrate under the action of the magnetic force, so that the ceramic dome 1 vibrates. The through holes 101 on the ceramic dome 1 can reduce the pressure difference at two sides of the ceramic dome 1 in the process of vibrating the ceramic dome 1, so as to ensure stable sounding of the loudspeaker.

Specifically, when the speaker is in the sounding state, the pressure difference range at two sides of the ceramic dome 1 is 50-1000Pa. The traditional dome is generally of an integral plate-shaped structure, so that sound production devices such as a loudspeaker are difficult to circulate in the sound production process, the pressure difference of two sides of the traditional dome is overlarge, the pressure difference of about 0.1MPa is generally achieved, and the overlarge pressure difference can influence or even damage a pressure sensor in the loudspeaker and components with weaker structural strength. By arranging the through holes 101 in the thickness direction of the ceramic dome 1, the pressure difference at two sides of the ceramic dome 1 can be obviously reduced when the loudspeaker produces sound, so that the pressure difference at two sides of the ceramic dome 1 is kept within the range of 50-1000Pa, the influence of the internal pressure of the loudspeaker on the components such as the internal sensor and the like is avoided, and the stability of the performance and the service life of the loudspeaker are ensured.

Specifically, a sensor assembly is arranged in the loudspeaker, and the sensor assembly can specifically comprise a pressure sensor, a temperature sensor, a humidity sensor and the like, wherein the sensor needs to keep the ambient pressure within a certain range during normal sensing and testing, and the sensing and testing errors of the sensor assembly can be increased due to the excessively high ambient pressure, so that the sensor assembly can not normally operate. By arranging the through holes 101 in the thickness direction of the ceramic dome 1, the pressure in the loudspeaker can be close to normal pressure, namely close to standard atmospheric pressure, so that the stable operation of the sensor assembly is ensured.

While certain specific embodiments of the application have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the application. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the application. The scope of the application is defined by the appended claims.

Claims

1. A diaphragm assembly for use in a loudspeaker, comprising:

the ceramic ball top is arranged in a hollow area of the folded ring part;

the ceramic dome is provided with a plurality of through holes in the thickness direction, the aperture range of the through holes is 2-25 mu m, the thickness range of the ceramic dome is 50-200 mu m, and the porosity range of the ceramic dome is 40-75%;

wherein the through hole penetrates through the upper surface and the lower surface of the ceramic dome and communicates the inside and the outside of the speaker;

under the condition that a loudspeaker applied by the vibrating diaphragm assembly is in a sounding state, the pressure difference range of two sides of the ceramic dome is 50Pa-1000Pa.

2. The diaphragm assembly of claim 1, wherein the aperture of the through-hole is in the range of 10-20 μm.

3. The diaphragm assembly of claim 1, wherein a plurality of the through holes are distributed in an array on the ceramic dome.

4. A diaphragm assembly according to claim 3, wherein the distance between adjacent through holes is 0.5-2 times the aperture of the through holes.

5. The diaphragm assembly of claim 1, wherein the ceramic dome material comprises at least one of aluminum oxide, silicon oxide, and silicon carbide.

6. The diaphragm assembly of claim 1, wherein the ceramic dome is formed by injection molding, sheet printing, or extrusion.

7. A loudspeaker comprising a magnetic circuit assembly, a voice coil, and a diaphragm assembly according to any one of claims 1 to 6;

8. The loudspeaker of claim 7, wherein the pressure differential across the ceramic dome ranges from 50Pa to 1000Pa when the loudspeaker is in a sound producing state.

9. The loudspeaker of claim 7, wherein a sensor assembly is disposed within the loudspeaker.