WO2022067989A1

WO2022067989A1 - Sound generation device, loudspeaker box, and integrated hot-press forming method

Info

Publication number: WO2022067989A1
Application number: PCT/CN2020/128309
Authority: WO
Inventors: 宋威; 令狐荣林; 肖波; 孔晨亮; 章统
Original assignee: 瑞声声学科技(深圳)有限公司; 瑞声光电科技(常州)有限公司
Priority date: 2020-09-30
Filing date: 2020-11-12
Publication date: 2022-04-07
Also published as: CN112261552B; CN112261552A

Abstract

The present invention provides a sound generation device, comprising a vibration system, a magnetic circuit system, and a ventilation isolation member. The vibration system comprises a diaphragm; the magnetic circuit system comprises a magnet yoke; the diaphragm and the magnet yoke are respectively arranged on two opposite sides of the sound generation device; the diaphragm, the magnet yoke and the ventilation isolation member jointly enclose a sound generation inner cavity; the magnet yoke is provided with a leakage hole; the sound generation inner cavity is connected to the outside by means of the leakage hole; the ventilation isolation member is attached and fixed to the magnet yoke and completely covers the leakage hole; the ventilation isolation member matches the magnet yoke in three-dimensional shape and completely covers a side of the magnet yoke away from the diaphragm; and the ventilation isolation member and the magnet yoke are integrally formed in a hot-press forming manner. The present invention provides a loudspeaker box using the sound generation device. The present invention provides an integrated hot-press forming method applied to a sound generation device. Compared with the related art, the sound generation device, the loudspeaker box and the integrated hot-press forming method solve the problem of sound-absorbing particles outside of the sound generation device leaking into the sound generation inner cavity, such that the reliability is improved, and assembly and manufacturing are easy.

Description

Sound-emitting device, speaker box, and integrated thermoforming method

technical field

The invention relates to the field of electro-acoustic conversion, in particular to a sound-generating device, a speaker box and an integrated hot-pressing molding method used in portable electronic products.

Background technique

With the advent of the mobile Internet era, the number of smart mobile devices continues to rise. Among many mobile devices, mobile phones are undoubtedly the most common and portable mobile terminal devices. At present, the functions of mobile phones are extremely diverse, one of which is the high-quality music function. Therefore, sound-generating devices for playing sound are widely used in smart mobile devices.

The sound-generating device of the related art includes a basin frame, a vibration system respectively fixed to the basin frame, a magnetic circuit system for driving the vibration system to vibrate and emit sound, and a ventilating isolator, and the vibration system includes a diaphragm fixed to the basin frame. , the magnetic circuit system includes a magnetic yoke fixed on the basin frame, the ventilating spacer is fixed on the basin frame and the magnetic yoke at the same time, and the basin frame, the diaphragm, the magnetic yoke and the damping member together to form a sounding inner cavity, the yoke is provided with a leakage hole passing through it, the sounding inner cavity is connected to the outside through the leakage hole, and the air-permeable isolator is fitted and fixed to the yoke and completely cover the leak hole.

However, in the sound-emitting device in the related art, the air-permeable spacer covers the leakage holes alone. When there are multiple leakage holes, each of the leakage holes is covered with a piece of the air-permeable spacer. The process is complicated, and errors are prone to occur at the same time, so that the leakage hole cannot be completely covered. When the sound-emitting device is applied to the speaker box, the back cavity of the speaker box is filled with sound-absorbing particles, and the breathable spacer is used to encapsulate the sound-absorbing particles. Outside the sound-emitting cavity, when there is an error in the process, the sound-absorbing particles are likely to leak powder into the sound-emitting cavity of the sound-emitting device, resulting in performance degradation and low reliability.

Therefore, it is necessary to provide a new sound generating device, speaker box and method to solve the above technical problems.

technical problem

The purpose of the present invention is to overcome the above-mentioned technical problems, and to provide a sound-emitting device, a speaker box and an integrated hot-pressing method for solving the problem that the sound-absorbing particles outside the sound-emitting device leak powder into the sound-emitting cavity, thereby improving reliability and being easy to assemble and manufacture. .

In order to achieve the above object, the present invention provides a sound-generating device, which includes a vibration system, a magnetic circuit system for driving the vibration system to vibrate and sound, and a ventilating isolator; the vibration system includes a diaphragm for vibration and sound, and the magnetic The circuit system includes a magnetic yoke, the diaphragm and the magnetic yoke are respectively arranged on opposite sides of the sound-emitting device, and the diaphragm, the magnetic yoke and the air-permeable spacer together form a sound-emitting inner cavity, so The magnetic yoke is provided with a leakage hole passing through it, the sounding inner cavity is connected to the outside through the leakage hole, and the breathable spacer is fitted and fixed to the magnetic yoke and completely covers the leakage hole. The spacer is matched with the three-dimensional shape of the magnetic yoke and completely covers the side of the magnetic yoke away from the vibrating membrane; the air-permeable spacer and the magnetic yoke are integrally formed by hot pressing.

More preferably, the magnetic yoke includes a magnetic yoke body, an extension portion bent and extended from the outer peripheral edge of the magnetic yoke body, and a fixed portion bent and extended from the extension portion in a direction away from the magnetic yoke body, The leakage hole is located in the extension part, and the fixing part is fixed with the vibration system; the air-permeable isolator completely fits and covers the yoke body, the extension part and the fixing part.

More preferably, the yoke body is rectangular, and the leakage holes include two and are respectively disposed on opposite sides of the yoke body.

More preferably, the magnetic yoke body is in the shape of a rectangle with rounded corners, and the leakage holes include four and are respectively located at the rounded corner positions of the extension portion close to the magnetic yoke body.

More preferably, the breathable spacer is a mesh cloth or a metal mesh.

More preferably, the sound-generating device further includes a basin frame, the diaphragm and the magnetic yoke are respectively fixed on opposite sides of the basin frame, the basin frame, the diaphragm, the magnetic yoke and the The air-permeable spacers together form the sounding inner cavity.

More preferably, the diaphragm includes a diaphragm body and a diaphragm side wall formed by bending and extending the diaphragm body in the direction of the basin frame, and the diaphragm side wall is fixed on the outer side of the basin frame. .

More preferably, the vibration system further includes an elastic support component located in the sounding inner cavity and opposite to the diaphragm and arranged at intervals, and the extension portion extends from the fixing portion to a direction away from the elastic support component So that the extension part forms an avoidance structure with the elastic support component, and the elastic support component is disposed opposite to the leakage hole.

technical solutions

The present invention also provides a loudspeaker box, the loudspeaker box includes the sound-generating device described in any one of the above.

The present invention also provides an integrated hot press molding method, which includes an upper mold and a lower mold for hot press molding and matching the shape of the magnetic yoke. It includes the following steps:

Step S1, applying glue on the side of the magnetic yoke that is located away from the diaphragm;

Step S2, putting the magnetic yoke into the lower mold and positioning, wherein the opposite side of the magnetic yoke coated with glue is abutted against the lower mold;

Step S3, then put the raw material of the breathable spacer into the lower mold;

Step S4, pressing the upper mold and the lower mold, so that the upper mold compresses the raw material and abuts the magnetic yoke;

Step S5, heating and maintaining the pressure of the upper mold and the lower mold, so that the raw material and the magnetic yoke are integrally formed;

In step S6, the integrally formed raw material and the magnetic yoke are demolded from the upper mold and the lower mold, and the raw material outside the magnetic yoke is cut off by a laser.

beneficial effect

Compared with the prior art, the sound-generating device and the speaker box of the present invention match the three-dimensional shape of the air-permeable spacer with the magnetic yoke and completely cover the side of the magnetic yoke away from the diaphragm, and use the The ventilating spacer and the magnetic yoke are integrally hot-pressed, so that the ventilating spacer completely covers the magnetic yoke, so that when the sound-emitting device is applied to the speaker box, the back cavity of the speaker box is filled with sound-absorbing particles, which The structure avoids the risk of the sound-absorbing particles leaking into the sound-emitting inner cavity of the sound-emitting device, thereby improving reliability and being easy to assemble and manufacture. The integrated hot pressing forming method of the present invention adopts the following steps: step S1, applying glue on the side of the magnetic yoke that is located away from the vibrating film; step S2, placing the magnetic yoke into the lower mold and positioning, wherein the magnetic yoke is coated with glue The opposite side is in contact with the lower mold; step S3, put the raw material of the air-permeable spacer into the lower mold; step S4, press the upper mold with the lower mold, so that the upper mold compresses the raw material and abuts against the magnetic yoke; step S5, heating and pressure-holding the upper mold and the lower mold, so that the raw material and the magnetic yoke are integrally formed; step S6, demolding the integrally formed raw material and the magnetic yoke from the upper mold and the lower mold, and laser The material outside the yoke is removed. Through the above steps, the integrated hot-pressing molding method of the present invention is easy to manufacture, and can make the sound-emitting device easy to assemble and manufacture, and also avoids the risk of the sound-absorbing particles leaking powder into the sound-emitting inner cavity of the sound-emitting device, and improves the reliability of the sound-emitting device.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, under the premise of no creative work, other drawings can also be obtained from these drawings, wherein:

Fig. 1 is the three-dimensional structure schematic diagram of the sound-emitting device of the present invention;

FIG. 2 is a schematic three-dimensional structure diagram of another angle of the sound-emitting device of the present invention;

3 is an exploded view of a partial three-dimensional structure of the sound-emitting device of the present invention;

FIG. 4 is a flow chart of the one-piece hot pressing forming method of the present invention.

Embodiments of the present invention

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Please refer to FIGS. 1-3 at the same time, the present invention provides a sound-generating device 100 , the sound-generating device 100 includes a basin frame 1 , a vibration system 2 , a magnetic circuit system 3 and a ventilating spacer 4 .

The basin frame 1 is used to fix the vibration system 2 and the magnetic circuit system 3 . In this embodiment, the basin frame 1 is rectangular. Of course, the sound-generating device 100 may not be provided with the basin frame 1, and the vibration system 2 and the magnetic circuit system 3 may be fixed to each other.

The vibration system 2 is fixed to the basin frame 1 . Specifically, the vibration system 2 includes a diaphragm 21 , a voice coil 22 and an elastic support component 23 .

The diaphragm 21 is used for vibrating and producing sound. The diaphragm 21 is fixed to the basin frame 1 . Specifically, the diaphragm 21 includes a diaphragm body 211 and a diaphragm sidewall 212 formed by bending the diaphragm body 211 toward the basin frame 1 , and the diaphragm sidewall 212 is fixed on the the outside of the basin frame 1. This structure enables the diaphragm 21 and the basin frame 1 to form a fixed structure with good sealing performance.

The voice coil 22 is fixed to the diaphragm 21, and the voice coil 22 is used to drive the diaphragm 21 to vibrate and produce sound.

The elastic support components 23 are opposite to the diaphragm 21 and are arranged at intervals. The elastic support assembly 23 is fixed to the basin frame 1 and connected to the side of the voice coil 22 away from the diaphragm 21 . Specifically, the elastic support assembly 23 includes an elastic member 231 fixed to the basin frame 1 and connected to the voice coil 22 , and an auxiliary diaphragm 232 attached to the elastic member 231 . The elastic support assembly 22 is used to strengthen the vibration effect of the diaphragm 21, so that the acoustic performance of the sound-emitting device 100 is good.

The magnetic circuit system 3 is fixed to the basin frame 1 . The magnetic circuit system 3 drives the vibration system 2 to vibrate and sound. Specifically, the magnetic circuit system 3 includes a magnetic yoke 31 , a main magnetic steel 32 and a secondary magnetic steel 33 .

The diaphragm 21 and the magnetic yoke 31 are respectively disposed on opposite sides of the sound generating device 100 . Specifically, the diaphragm 21 and the magnetic yoke 31 are respectively fixed on opposite sides of the basin frame 1 .

The magnetic yoke 31 includes a magnetic yoke body 311 , an extension portion 312 bent and extended from the outer periphery of the magnetic yoke main body 311 , and a fixed portion bent and extended from the extension portion 312 in a direction away from the magnetic yoke body 311 . Section 313. The fixing portion 313 is fixed to the vibration system 2 . The yoke 31 is fixed to the basin frame 1 . Specifically, the fixing portion 313 is fixed to the basin frame 1 . The extension portion 312 extends from the fixing portion 313 in a direction away from the elastic support element 23 , so that the extension portion 312 forms an avoidance structure with the elastic support element 23 .

The main magnetic steel 32 and the secondary magnetic steel 33 are respectively fixed to the yoke body 311 .

The auxiliary magnetic steel 33 surrounds the main magnetic steel 32 and is spaced apart from the main magnetic steel 32 to form a magnetic gap 30 , and the voice coil 22 is inserted into the magnetic gap 30 .

The breathable spacer 4 is attached and fixed to the magnetic yoke 31 . Specifically, the air-permeable spacer 4 completely fits and covers the yoke body 311 , the extending portion 312 and the fixing portion 313 . The vibrating membrane 21 , the magnetic yoke 31 and the air-permeable spacer 4 together form a sound-emitting inner cavity 10 . In this embodiment, the basin frame 1 , the vibrating membrane 21 , the magnetic yoke 31 and the air-permeable spacer 4 together enclose the sounding inner cavity 10 . The voice coil 22 , the elastic support component 23 , the main magnetic steel 32 and the secondary magnetic steel 33 are all located in the sounding inner cavity 10 .

In order to balance the sounding cavity 10 with the air pressure outside, so that the sounding device 100 has good acoustic performance, the magnetic yoke 31 is provided with a leakage hole 310 therethrough. Specifically, the leakage hole 310 is located in the extension portion 312 . The sounding cavity 10 is connected to the outside through the leakage hole 310 . The elastic support assembly 23 is disposed opposite to the leakage hole 310 , and this structure makes the air pressure balance between the sounding inner cavity 10 and the outside world good, so that the sounding device 100 has good acoustic performance.

In this embodiment, the yoke body 311 is rectangular with rounded corners. The leakage holes 310 include four and are respectively located at the rounded positions of the extension portion 312 close to the yoke body 311 . This arrangement is beneficial for the air in the sound-emitting cavity 10 to be connected to the outside through the four leakage holes 310 evenly, so that the air pressure balance between the sound-emitting cavity 10 and the outside is better, so that the sound-emitting device 100 has a better air pressure balance. Better acoustic performance.

Of course, it is not limited to this. In another embodiment, the yoke body 311 is rectangular, and the leakage holes 310 include two and are respectively disposed on opposite sides of the yoke body 311 . This structure can also make the air pressure balance between the sound-emitting inner cavity 10 and the outside world good, so that the sound-emitting device 100 has good acoustic performance.

The gas permeable spacer 4 completely covers the leakage hole 310 . The air-permeable spacer 4 matches the three-dimensional shape of the magnetic yoke 31 and completely covers the side of the magnetic yoke 31 away from the diaphragm 21 . Therefore, when the sound-emitting device 100 is applied to a speaker box, the back cavity of the speaker box is filled with sound-absorbing particles, and this structure avoids the risk of the sound-absorbing particles leaking into the sound-emitting inner cavity 10 of the sound-emitting device 100, thereby improving the performance of the sound-absorbing particles. The reliability of the sound-emitting device 100 is improved.

In order to match the three-dimensional shapes of the air-permeable spacer 4 and the magnetic yoke 31 , the air-permeable spacer 4 and the magnetic yoke 31 are integrally formed by hot pressing. The air-permeable spacer 4 and the magnetic yoke 31, which are integrally hot-pressed, form an integral structure. On the one hand, this structure is beneficial to ensure the risk of powder leakage of the sound-absorbing particles in the rear cavity of the speaker box, and on the other hand, it can also make the sound-emitting The device 100 is easier to assemble and manufacture, thereby improving the production efficiency and yield of the sound-emitting device 100 .

In this embodiment, the breathable spacer 4 is a mesh cloth or a metal mesh. Of course, it is not limited to this, and materials that can be breathable and can isolate sound-absorbing particles can be used according to actual needs, such as non-woven fabrics, breathable plastic films, and the like.

The present invention also provides a speaker box, which includes the sound-generating device 100 as described above. Because the ventilating spacer 4 and the magnetic yoke 31 are integrally formed by hot pressing of the sound generating device 100 , the risk of powder leakage from the sound absorbing particles in the rear cavity of the speaker box can be effectively avoided.

The present invention also provides an integrated hot pressing molding method, which includes an upper mold and a lower mold for hot pressing molding and matching the shape of the magnetic yoke 31 , and the integrated hot pressing molding method is applied to the sound-emitting device 100 .

Please refer to FIG. 4 , the one-piece hot pressing forming method includes the following steps:

Step S1 , applying glue on the side of the magnetic yoke 31 that is located away from the diaphragm 21 .

In the step S1, the process of applying the glue adopts the spraying process, which makes the distribution of the glue more balanced.

Step S2, put the magnetic yoke 31 into the lower mold and position it, wherein the opposite side of the magnetic yoke 31 coated with glue is abutted against the lower mold.

In step S3, the raw material of the air-permeable spacer 4 is put into the lower mold.

In the step S3, the raw material is the air-permeable spacer 4 that has not been cut, that is, the mesh or metal mesh that has not been cut.

Step S4 , pressing the upper mold and the lower mold, so that the upper mold compresses the raw material and abuts the magnetic yoke 31 .

In the step S4 , the upper mold is pushed toward the lower mold to press the raw material and abut the magnetic yoke 31 . Of course, it is not limited to this, and the upper mold can also be ventilated, and the raw material can be compressed and abutted against the magnetic yoke 31 by air pressure. This method has a good bonding effect and generates few bubbles.

Step S5 , heating and maintaining the pressure of the upper mold and the lower mold, so that the raw material and the magnetic yoke 31 are integrally formed. The specific heating temperature and the pressing pressure need to be selected by the designer according to the specific material of the breathable spacer 4 .

In step S6, the integrally formed raw material and the magnetic yoke 31 are demolded from the upper mold and the lower mold, and the raw material outside the magnetic yoke 31 is cut off by a laser. The efficiency of laser ablation is good, especially when the volume of the sound-emitting device 100 is small and the machining accuracy is high, the use of laser ablation can avoid damage to the sound-emitting device 100, and can also improve production efficiency.

Through the above steps, the integrated hot-pressing molding method of the present invention is easy to manufacture, and the sound-emitting device 100 can be easily assembled and manufactured, and at the same time, the risk of leakage of sound-absorbing particles into the sound-emitting cavity 10 of the sound-emitting device 100 is avoided, and the sound-emitting device 100 is improved. reliability.

The above are only the embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, improvements can be made without departing from the inventive concept of the present invention, but these belong to the present invention. scope of protection.

Claims

A sound-generating device includes a vibration system, a magnetic circuit system for driving the vibration system to vibrate and sound, and a ventilating isolator; the vibration system includes a vibrating film for vibration and sound, the magnetic circuit system includes a yoke, and the The vibrating membrane and the magnetic yoke are respectively arranged on opposite sides of the sounding device, the vibrating membrane, the magnetic yoke and the air-permeable spacer together form a sounding inner cavity, and the magnetic yoke is provided with a penetrating cavity. The sound-emitting inner cavity is connected to the outside through the leakage hole, and the breathable spacer is fitted and fixed to the yoke and completely covers the leakage hole. It is characterized in that the breathable spacer is connected to the The three-dimensional shape of the magnetic yoke is matched and completely covers the side of the magnetic yoke away from the diaphragm; the air-permeable spacer and the magnetic yoke are integrally formed by hot pressing.
The sound-generating device according to claim 1, wherein the magnetic yoke comprises a magnetic yoke body, an extension portion bent and extended from the outer peripheral edge of the magnetic yoke body, and a direction away from the magnetic yoke from the extension portion A fixed part that is bent and extended in the direction of the body, the leakage hole is located in the extended part, and the fixed part is fixed to the vibration system; the air-permeable isolator completely fits and covers the yoke body and the extended part and the fixing part.
The sound-generating device according to claim 2, wherein the magnetic yoke body is rectangular, and the leakage holes include two and are respectively disposed on opposite sides of the magnetic yoke body.
The sound-generating device according to claim 2, wherein the yoke body is in the shape of a rectangle with rounded corners, and the leakage holes include four and are respectively located at the rounded positions of the extension part close to the yoke body .
The sound-generating device according to claim 1, wherein the air-permeable spacer is a mesh cloth or a metal mesh.
The sound-generating device according to claim 1, wherein the sound-generating device further comprises a basin frame, the diaphragm and the magnetic yoke are respectively fixed on opposite sides of the basin frame, the basin frame, the The vibrating membrane, the magnetic yoke and the air-permeable spacer together form the sounding inner cavity.
The sound-generating device according to claim 6, wherein the vibrating membrane comprises a vibrating membrane body and a vibrating membrane side wall formed by bending and extending the vibrating membrane body in the direction of the basin frame, and the vibrating membrane The side wall is fixed on the outside of the basin frame.
The sound-generating device according to claim 2, wherein the vibration system further comprises an elastic support component located in the sound-generating inner cavity and opposite to the vibrating membrane and arranged at intervals, and the extension part is formed by the fixing part Extending in a direction away from the elastic support component, the extension part forms an avoidance structure with the elastic support component, and the elastic support component is disposed opposite to the leakage hole.
A loudspeaker box, characterized in that the loudspeaker box comprises the sound-generating device according to any one of claims 1 to 8.
A one-piece thermoforming method, comprising an upper die and a lower die for thermoforming and matching the shape of the magnetic yoke, characterized in that the method is applied to any one of claims 1 to 8 A sound-emitting device, the method includes the following steps:

Step S1, applying glue on the side of the magnetic yoke that is located away from the diaphragm;

Step S2, putting the magnetic yoke into the lower mold and positioning, wherein the opposite side of the magnetic yoke coated with glue is abutted against the lower mold;

Step S3, then put the raw material of the breathable spacer into the lower mold;

Step S4, pressing the upper mold and the lower mold, so that the upper mold compresses the raw material and abuts the magnetic yoke;

Step S5, heating and maintaining the pressure of the upper mold and the lower mold, so that the raw material and the magnetic yoke are integrally formed;

In step S6, the integrally formed raw material and the magnetic yoke are demolded from the upper mold and the lower mold, and the raw material outside the magnetic yoke is cut off by a laser.