WO2019184476A1

WO2019184476A1 - Loudspeaker module

Info

Publication number: WO2019184476A1
Application number: PCT/CN2018/123302
Authority: WO
Inventors: 张北京; 刘琦; 蔡晓东
Original assignee: 歌尔股份有限公司
Priority date: 2018-03-30
Filing date: 2018-12-25
Publication date: 2019-10-03
Also published as: CN108513210A; CN108513210B

Abstract

Disclosed is a loudspeaker module, comprising a module housing and a loudspeaker unit. The loudspeaker unit comprises a vibration system; the vibration system comprises a diaphragm; the diaphragm comprises a fixing portion, a suspension ring portion, and a central portion; the central portion is a planar structure; the module housing corresponding to the diaphragm comprises a lower surface at the side close to the diaphragm and an upper surface at the side away from the diaphragm; the lower surface of the module housing directly facing the central portion is provided with a ridge portion; a height difference is formed between the lower surface corresponding to the suspension ring portion and the lower surface at the ridge portion. According to the loudspeaker module provided in the present invention, a spacing between the central portion of the diaphragm and the inner side surface of a corresponding part of the module housing right above the diaphragm is reduced by means of the structural design of the ridge portion on the module housing, and Fh of a loudspeaker frequency response curve can extend to a high frequency direction while ensuring the height of a sound outlet and not affecting low frequency loudness in a loudspeaker, thereby broadening the frequency bandwidth of the loudspeaker frequency response curve and increasing the high frequency loudness.

Description

Speaker module

Technical field

The invention relates to the field of electroacoustic technology. More specifically, it relates to a speaker module.

Background technique

The speaker module is an important acoustic device for portable electronic devices. It is used to convert electrical signals and acoustic signals. It is an energy conversion device. With the demand for thin and light mobile phones, the module is designed to be sounded. In the actual use of many drawbacks, the side sound has gradually become the mainstream way of speaker module design. The general speaker module includes a module housing and a speaker unit housed in the module housing, and the speaker unit separates the cavity enclosed by the module housing into a front cavity and a rear cavity. The side wall of the module housing is provided with a side sound outlet of the speaker module, and the side cavity is connected to the upstream cavity of the speaker unit through the sound channel; the sound generated by the speaker unit vibration system passes through The upstream cavity, the sounding channel and the side outlet port propagate outside the speaker module.

In the existing side-sounding speaker module, the module shell corresponding to the diaphragm directly above the speaker is mostly a flat-shaped structure, and in order to obtain greater loudness, the sound channel height of the side-out sound speaker module is required. The bigger the better, but the larger the height of the sounding channel must make the cavity space between the speaker single diaphragm and the inner surface of the module housing corresponding to the upper side of the module also become larger, resulting in a high frequency of the frequency response curve. Fh has a narrower bandwidth and a higher frequency loudness.

Therefore, there is a need to provide a new speaker module structure that overcomes the deficiencies of the prior art.

Summary of the invention

In view of the above problems, at least one object of the present invention is to provide a speaker module. By improving the structure of the speaker module, Fh of the frequency response curve of the speaker module is extended to a high frequency direction, and the frequency bandwidth of the frequency response curve is widened. Improve the high-frequency curve of the speaker module, improve the high-frequency loudness of the speaker module, and reduce the harmonic distortion of the speaker.

In order to achieve the above object, the present invention adopts the following technical solutions:

According to at least one aspect of the present invention, a speaker module includes a module housing and a speaker unit received in a cavity formed by the module housing, and the module housing is provided with an acoustic port The speaker unit includes a vibration system and a magnetic circuit system; the vibration system includes a diaphragm and a voice coil coupled to one side of the diaphragm, and the diaphragm includes an outermost fixing portion and is located inside the fixing portion a bent-shaped folding ring portion and a central portion located inside the folding ring portion; a front cavity communicating with the sounding port is formed between the diaphragm and the module housing;

The central portion is a planar structure;

The module casing corresponding to the diaphragm includes a lower surface adjacent to one side of the diaphragm and an upper surface away from a side of the diaphragm;

A ridge portion is provided on a lower surface of the module case facing the central portion, and a height difference is formed between a corresponding lower surface of the folded ring portion and a lower surface at the position of the ridge portion.

Further, preferably, the ridge portion is formed by recessing the module casing from the upper surface to the lower surface direction.

Further, preferably, the ridge portion is formed by projecting from a lower surface of the module casing.

Further, it is preferable that the corresponding lower surface portion of the ridge portion is a flat surface.

Further, preferably, the orthographic projection area of the central portion covers the orthographic projection area of the raised portion; or the orthographic projection area of the central portion coincides with the orthographic projection of the raised portion.

Further, preferably, the loop portion is bent toward a side away from the voice coil.

Further, preferably, the distance between the top of the folded portion and the corresponding lower surface is greater than the distance between the top surface of the central portion and the lower surface at the position of the raised portion.

Further, preferably, the ridge portion is provided with at least two, and the module outer casing portion between the adjacent two of the ridge portions forms a rib portion.

Furthermore, it is preferred that the width of the rib portion is smaller than the width of the ridge portion.

In addition, preferably, the module housing includes a body portion, and the body portion corresponding to the diaphragm includes a hollow portion penetrating through the inner and outer side surfaces of the body portion, and the hollow portion is provided with the cover hollow a metal piece of the portion, the metal piece is combined with the body portion to form the module casing; the ridge portion is formed on a portion of the metal piece exposed by the hollow portion.

The beneficial effects of the present invention are as follows:

1. The speaker module provided by the present invention, through the structural design of the ridge portion on the module casing, keeps the lower surface and the ridge portion of the module casing corresponding to the folding ring portion while the speaker single diaphragm structure remains unchanged. A height difference is formed between the lower surface of the module housing at the position, and the structural design reduces the spacing between the central portion of the diaphragm and the lower surface of the module housing corresponding thereto directly above, and the height of the front chamber sound passage does not follow The reduction, under the premise of ensuring the height of the sound outlet, and without affecting the low frequency loudness in the speaker, the Fh of the speaker frequency response curve can be extended to the high frequency direction, widening the frequency bandwidth of the speaker frequency response curve, and the speaker The high frequency curve is improved, the high frequency loudness is also increased, and the speaker harmonic distortion is reduced.

2. In the present invention, the ridge portion is disposed corresponding to the central portion of the diaphragm of the speaker unit, and the height of the top portion of the diaphragm ring portion corresponding to the lower surface of the module housing remains unchanged, thereby ensuring sufficient sound path height and vibration. A sufficient amount of vibration space required for the membrane to vibrate.

3. The ridge portion of the present invention may be formed by the module housing recessed from the upper surface to the lower surface direction, and the sidewall of the ridge portion formed by the recess on the module housing reinforces the strength of the module housing at the ridge portion, and is formed by the module housing. The recessed area formed by the recess of the upper surface can be fitted and fitted with the mounting surface of the terminal electronic device of a specific structure.

4. In addition to the speaker module provided by the present invention, a plurality of ridges may be disposed on the module casing, and the module outer casing portion between the adjacent two ridge portions forms a rib portion, and the rib portion can facilitate the module on one hand. On the other hand, with the rib portion of the terminal electronic device, the rib portion can be in contact with the mounting surface of the terminal electronic device during assembly, thereby improving the strength of the module housing and eliminating the vibration of the front cavity when the speaker is vibrating. The hidden danger of generating resonant harmonics avoids the occurrence of distortion and improves the assembly stability, assembly strength and overall acoustic performance of the speaker module.

DRAWINGS

The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view showing a mating structure of a speaker module of a conventional speaker module and a module housing.

FIG. 2 is a schematic view showing the inner structure of the conventional module housing shown in FIG. 1.

FIG. 3 is a schematic view showing the outer structure of the conventional module housing shown in FIG. 1.

4 is a cross-sectional view showing the mating structure of the speaker module and the module housing of the speaker module provided by the present invention.

FIG. 5 shows an assembly view of the speaker module structure shown in FIG.

Fig. 6 is a schematic view showing the inner structure of the module casing shown in Fig. 4.

FIG. 7 is a schematic view showing the outer structure of the module casing shown in FIG.

Figure 8 is a schematic illustration of the outer structure of a preferred embodiment of the module housing provided by the present invention.

detailed description

In order to explain the present invention more clearly, the present invention will be further described in conjunction with the preferred embodiments and the accompanying drawings. Similar components in the drawings are denoted by the same reference numerals. It should be understood by those skilled in the art that the following detailed description is not intended to limit the scope of the invention.

In the following description, for the purposes of illustration However, it is apparent that these embodiments may be practiced without these specific details. In other instances, well known structures and devices are shown in block diagram form in order to facilitate describing one or more embodiments.

In order to explain the present invention more clearly, the present invention will be further described in conjunction with the preferred embodiments and the accompanying drawings. Similar components in the drawings are denoted by the same reference numerals. It should be understood by those skilled in the art that the following detailed description is intended to be illustrative and not restrictive.

As shown in FIG. 4 and FIG. 5, the present invention provides a speaker module, which includes a module housing and a speaker unit 1 received in a cavity formed by the module housing. The group housing includes a first housing 2 and a second housing (not shown) that are fixedly coupled together, and the module housing is provided with an acoustic port 21, and the speaker unit 1 includes a vibration system and a magnetic circuit system. The vibration system includes a diaphragm 3 and a voice coil coupled to one side of the diaphragm 3, and the diaphragm 3 includes an outermost fixing portion, a bent folding portion 31 located inside the fixing portion, and a folding ring. The central portion of the inner portion of the portion 31 has a planar structure, and the voice coil is coupled to one side of the central portion of the diaphragm 3; the magnetic circuit system of the speaker unit is formed with a magnetic field and has a magnetic gap for accommodating the voice coil.

In this embodiment, the speaker unit separates the cavity enclosed by the module housing formed by the first outer casing 2 and the second outer casing (not shown) into the front and rear chambers separated from each other, and the sound outlet 21 is formed on the side wall of the first outer casing 2 by the first outer casing 2 of the module casing, and a front cavity is formed between the diaphragm 3 and the first outer casing 2 to communicate with the sound outlet 21; the front cavity includes The upstream cavity of the speaker unit 1 and the sounding passage 22 for communicating the upstream cavity and the sounding port 21, the sound generated by the speaker unit vibration system is transmitted to the speaker mode through the sounding channel 22 and the sounding port 21 Outside the group.

As shown in FIG. 1, FIG. 2 and FIG. 3, in the existing side-sounding speaker module, the module housing 200 of the front cavity of the speaker module is formed together with the diaphragm of the speaker unit 100, and is located at the speaker unit 100. The structure of the partial outer casing 201 directly above the central portion of the membrane is mostly a flat structure. In order to obtain greater loudness, the height of the sounding passage of the side sounding speaker module needs to be as large as possible, but the height of the larger sounding passage must be The cavity space between the diaphragm of the speaker unit 100 and the inner surface of the portion of the outer casing 201 corresponding thereto is also increased, resulting in a low frequency of the frequency response curve, a narrow bandwidth, and high frequency loudness limitation. .

In the speaker module structure provided by the present invention, the central portion of the diaphragm 3 has a planar structure, and the first outer casing 2 corresponding to the diaphragm 3 includes a lower surface on the side close to the diaphragm 3 and a side away from the diaphragm 3 a swelled portion 4 on a lower surface of the first outer casing 2 facing the central portion of the diaphragm 3, the lower surface of the first outer casing 2 corresponding to the pleat portion of the diaphragm 3 and the ridge portion A height difference is formed between the lower surfaces of the first outer casings 2 at the four positions. In other words, the ridge portion 4 is provided in the first outer casing 2, and a contraction cavity is formed between the lower surface of the first outer casing 2 at the position of the ridge portion 4 and the top surface of the diaphragm portion 3 having a planar structure away from the voice coil. 5.

Further, the height of the contraction inner cavity 5 formed between the lower surface of the first outer casing 2 and the central portion of the diaphragm 3 at the position of the ridge portion 4 is compared with the module outer casing corresponding to the central portion of the diaphragm of the prior art module. The height of the structure is shortened, and the structural design reduces the distance between the central portion of the diaphragm 3 and the lower surface of the first outer casing 2 at the position of the ridge portion 4, and the height of the sounding passage 22 does not decrease accordingly. Under the premise of ensuring the height of the sound outlet 21 and without affecting the low frequency loudness in the speaker, the high frequency curve of the speaker module is improved, and the Fh of the frequency response curve can be extended to the high frequency direction, and the frequency band of the speaker frequency response curve is widened. Width, high frequency loudness also increases, and speaker harmonic distortion is reduced. It should be noted that, in conjunction with the illustrated structure, the vibration system of the speaker unit provided by the present invention may further include a reinforcing portion 32 fixedly coupled with the central portion of the diaphragm 3, and the reinforcing portion 32 may be located at a central portion away from the voice coil. The top surface may also be located at a bottom portion of the central portion near the voice coil; see FIG. 4, when the reinforcing portion 32 is located at a central portion away from the top surface of the voice coil, the lower surface of the first outer casing 2 at the position of the ridge portion 4 A contraction lumen 5 is formed between the surface of the reinforcing portion 32 that is away from the central portion. Of course, it can be understood that when the reinforcing portion is located near the bottom surface of the voice coil at the central portion, the lower surface of the first outer casing 2 at the position of the raised portion and the top surface of the diaphragm away from the reinforcing portion are formed. The inner cavity is contracted, and the present invention is not limited thereto.

For the formation of the ridge portion, it may be formed by the lower surface of the module housing, or as shown in the illustrated structure of the present invention, the formation of the ridge portion is formed by the module housing recessed from the upper surface to the lower surface direction, specifically, As shown in FIG. 6 and FIG. 7 , in the embodiment, the ridge portion 4 is formed by the first outer casing 2 in the module casing from the upper surface to the lower surface direction, and the first outer casing 2 of the module outer casing is recessed. The sidewall of the formed ridge 4 can enhance the overall strength of the module casing, and the recessed area formed by the lower surface of the upper surface of the first casing 2 can be fitted with the mounting surface of the terminal electronic device of a specific structure, of course. It can be understood by those skilled in the art that the mounting surface of the terminal electronic device of a specific structure may or may not be in contact with the upper surface of the first outer casing 2 at the position of the ridge portion 4, which is not limited by the present invention. Further, based on the object of the invention, in order to enable the speaker module to obtain superior acoustic performance, preferably, the lower surface portion of the first outer casing 2 corresponding to the ridge portion 4 is a flat surface.

As shown in FIG. 4, the orthographic projection area of the central portion of the present invention covers the orthographic projection area of the raised portion 4; of course, those skilled in the art can understand that the orthographic projection area of the central portion can also be The orthographic projections of the ridges 4 are superimposed. The design of the ridge portion 4 corresponding to the central portion of the speaker unit diaphragm 3 does not change the area of the front projection of the diaphragm 3, and the effective vibration area of the diaphragm 3 remains unchanged. The distance between the top of the 31 and the lower surface of the first outer casing 2 corresponding thereto remains unchanged, and sufficient sound space for the sound path 22 and the vibration space required for the vibration of the diaphragm 3 can be left, and the diaphragm 3 is avoided. When vibrating, the diaphragm 3 folded portion 31 collides with the ridge portion 4 to generate noise, which affects the appearance of the acoustic performance of the speaker module, and ensures the sounding effect of the diaphragm.

In addition, as shown in FIG. 4, in the specific embodiment provided by the present invention, the folding ring portion 21 is disposed in a bending structure toward a side away from the voice coil, and the top of the folding ring portion 21 and the corresponding first portion The distance between the lower surfaces of the outer casing 2 is greater than the distance between the top surface of the central portion and the lower surface of the first outer casing 2 at the position of the ridge portion 4, and the lower surface of the first outer casing 2 corresponding to the ridge portion 4 is located The side of the top of the loop portion 21 that is away from the voice coil. One of the purposes of this design is to avoid collision between the ridge portion 4 and the diaphragm 3, to generate noise, and to affect the sounding effect of the diaphragm; another purpose is to obtain the most distance by adjusting the distance between the diaphragm and the module casing. Excellent acoustic effect, for example, in the actual product structure, the distance between the top of the folded portion 21 and the lower surface of the corresponding first outer casing 2 may be 0.76 mm, the top surface of the central portion and the ridge The distance between the lower surface of the first outer casing 2 at the position of the portion 4 may be 0.65 mm, and it should be said that the overall acoustic performance of the speaker module is optimal at this time.

Of course, those skilled in the art can understand that the above-mentioned module structure is only an optimal implementation manner, and it should be said that the lower surface of the module housing corresponding to the ridge portion without leaving the object of the present invention. It may also extend toward the diaphragm, and the lower surface of the module housing corresponding to the ridge may extend to the top of the folding ring near the voice coil on the premise that there is no collision between the ridge and the diaphragm. One side. In addition, the distance between the top of the folding portion and the lower surface of the corresponding module housing may also be equal to or smaller than the distance between the top surface of the central portion and the lower surface of the module housing at the position of the ridge portion. There are no restrictions.

As shown in FIG. 8 , as a preferred embodiment, in the module housing structure provided by the embodiment, the module housing includes two ridges 4 formed on the first housing 2 , and two ridges The first outer casing 2 portion between the portions 4 forms a rib portion 6. Preferably, the width of the rib portion 6 is smaller than the width of the ridge portion 4. The rib portion 6 can facilitate the assembly of the module and the terminal electronic device on the one hand, and on the other hand, the rib portion 6 can be in contact with the mounting surface of the terminal electronic device during assembly, thereby further improving the mode. The strength of the outer casing eliminates the hidden danger of the resonance resonance of the front cavity when the speaker vibrates, avoids the occurrence of distortion, and improves the assembly stability, assembly strength and overall acoustic performance of the speaker module. In addition, in order to ensure the cooperation of the mounting surface between the module housing and the terminal electronic device, it is preferable that the upper surface of the rib portion 6 is located at the same horizontal plane as the upper surface of the first outer casing 2 corresponding to the ridge edge. When the mounting surface of the terminal electronic device is flat, the mounting surface of the terminal electronic device can be directly abutted against the upper surface of the rib portion 6. However, it should be noted that the above embodiment is only a preferred embodiment. In addition to the above rib structure, when the upper surface of the rib portion is lower than or exceeds the first outer casing corresponding to the edge of the ridge portion When the upper surface is used, those skilled in the art can understand that the mounting surface of the terminal electronic device should include a protruding structure or a recessed structure adapted to the rib portion, so that the rib portion is abutted and fixed to the mounting surface of the terminal electronic device. The utility model is used for improving the stability and assembly strength of the speaker module, and eliminating the hidden danger of the resonance harmonic generated by the front cavity when the speaker vibrates, which is not limited by the present invention.

In addition, when the module housing includes a ridge formed on the first housing, in a recessed area formed by the upper surface of the first housing, it may also be integrally molded with the module housing or by sticking One or more ribs are formed in the recessed area, and the plurality of ribs may be arranged in a grid or in a grid shape. The rib portion provided in this manner can also realize that the mounting surface of the terminal electronic device can directly abut against the upper surface of the rib portion to improve the stability and assembly strength of the speaker module, and further eliminate the front cavity. The beneficial effect of the resonance harmonics is generated when the speaker vibrates. Preferably, the thickness of the rib portion is not greater than the longitudinal depth of the recess of the upper surface, but it is understood that when the thickness of the rib portion is greater than the longitudinal depth of the recess of the upper surface, the mounting surface of the terminal electronic device should include There is a recessed structure adapted to the rib portion so that the rib portion abuts against the mounting surface of the terminal electronic device, and the present invention is not limited thereto.

As another preferred embodiment, the module housing of the present invention includes a body portion, and the body portion corresponding to the diaphragm includes a hollow portion penetrating through the inner and outer surfaces of the body portion, and the hollow portion is provided with The metal piece covering the hollow portion can satisfy the required strength in the case of a thinner thickness due to the greater strength of the metal piece, and can be increased by the design of the metal piece when the outer shape of the speaker module is constant. The internal cavity space of the speaker module increases the size of the speaker unit vibration system and the magnetic circuit system, thereby improving the acoustic performance of the product. In this embodiment, the metal piece and the body portion may be combined to form a first outer casing structure of the module outer casing by injection molding, bonding, or the like, and the raised portion is formed on a portion of the metal piece exposed by the hollow portion.

Further, the metal piece includes a lower surface corresponding to a side of the diaphragm corresponding to the diaphragm and an upper surface away from a side of the diaphragm; the ridge may be recessed from a lower surface of the metal sheet to a lower surface direction; or The ridge portion is formed by protruding from a lower surface of the metal piece.

In the preferred embodiment, the thickness of the metal piece is thin, and the strength of the module casing is satisfied, on the one hand, the vibration space required for the vibration of the diaphragm is increased, and the other condition for ensuring the structural size of the speaker is constant. In this way, the height of the sound channel of the speaker module can be increased, so that greater loudness can be obtained. With respect to the structural form of the ridge portion and the advantage of its arrangement with the central portion of the diaphragm, the structure of the ridge portion and the configuration of the central portion of the diaphragm with respect to the prior art are compared with those of the prior art. The advantages are the same and will not be described here.

In addition, when the ridge portion is recessed from the upper surface of the metal sheet to the metal sheet, the metal sheet may include two ridge portions formed on the metal sheet, and the metal sheet portion between the two ridge portions is formed. Ribs. The rib portion can be in contact with the assembly surface of the terminal electronic device, further improving the strength of the module outer casing, eliminating the hidden danger of the resonance harmonic generated by the front cavity when the speaker vibrates, avoiding the occurrence of distortion, and improving the assembly of the speaker module. Stability, assembly strength and overall acoustic performance.

In summary, the speaker module provided by the present invention reduces the central portion of the diaphragm and directly above the diaphragm through the structural design of the ridge portion on the module housing while the speaker unit diaphragm structure remains unchanged. The spacing between the lower surfaces of the corresponding module casings ensures that the height of the sound channel is not reduced, and the speaker is made under the premise of ensuring the height of the sound port without affecting the low frequency loudness of the speaker. The Fh of the frequency response curve can extend in the high frequency direction, widening the frequency bandwidth of the speaker frequency response curve, improving the high frequency curve of the speaker, increasing the high frequency loudness, and reducing the harmonic distortion of the speaker.

It is apparent that the above-described embodiments of the present invention are merely illustrative of the present invention and are not intended to limit the embodiments of the present invention, and those skilled in the art can also make the above description. It is to be understood that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims

A speaker module includes a module housing and a speaker unit received in a cavity formed by the module housing, the module housing is provided with an acoustic port, and the speaker unit includes a vibration system and a magnetic a vibration system comprising a diaphragm and a voice coil fixed to one side of the diaphragm, the diaphragm comprising an outermost fixing portion, a bent folding portion located inside the fixing portion, and a folding portion a central portion of the inner side of the ring portion; a front cavity that communicates with the sound outlet port is formed between the diaphragm and the module housing;

The central portion is a planar structure;

The module casing corresponding to the diaphragm includes a lower surface adjacent to one side of the diaphragm and an upper surface away from a side of the diaphragm;

A ridge portion is provided on a lower surface of the module case facing the central portion, and a height difference is formed between a corresponding lower surface of the folded ring portion and a lower surface at the position of the ridge portion.
The speaker module according to claim 1, wherein the ridge portion is formed by a recess of the module housing from a top surface to a lower surface direction.
The speaker module according to claim 1, wherein the ridge portion is formed by a lower surface of the module case.
The speaker module according to claim 1, wherein the corresponding lower surface portion of the ridge portion is a flat surface.
The speaker module according to claim 1, wherein an orthographic projection area of the central portion covers an orthographic projection area of the raised portion; or an orthographic projection of the central portion and an orthographic projection of the raised portion coincide.
The speaker module according to claim 1, wherein the folded portion is bent toward a side away from the voice coil.
The speaker module according to claim 1, wherein a distance between a top of the folded portion and a corresponding lower surface is greater than a lower surface of the central portion and a lower surface of the raised portion The distance between them.
The speaker module according to claim 2, wherein the ridge portion is provided with at least two, and a module outer casing portion between two adjacent ridge portions forms a rib portion.
The speaker module according to claim 8, wherein the width of the rib portion is smaller than the width of the ridge portion.
The speaker module according to any one of claims 1 to 5, wherein the module housing comprises a body portion, and the body portion corresponding to the diaphragm comprises an inner and outer surface extending through the body portion a hollow portion, wherein the hollow portion is provided with a metal sheet covering the hollow portion, the metal sheet and the body portion are combined to form the module outer casing; and the raised portion is formed on the hollow portion of the metal sheet On the exposed part.