CN109495819B

CN109495819B - Sound production device and earphone

Info

Publication number: CN109495819B
Application number: CN201811326476.9A
Authority: CN
Inventors: 郭晓冬; 侯燕燕; 刘春发
Original assignee: Goertek Inc
Current assignee: Goertek Inc
Priority date: 2018-11-02
Filing date: 2018-11-08
Publication date: 2020-11-20
Anticipated expiration: 2038-11-08
Also published as: WO2020087757A1; CN109495819A

Abstract

The invention discloses a sound production device and an earphone. This sound generating mechanism includes: a magnetic circuit system, a through hole is formed at the center of the magnetic circuit system; the vibration component comprises a vibration diaphragm, a voice coil and a centering support piece, the centering support piece comprises a supporting part, a fixing part and a connecting arm, the supporting part surrounds the fixing part, the connecting arm is connected between the fixing part and the supporting part, a vibration area is arranged in the vibration diaphragm, and the voice coil, the vibration area and the supporting part are connected; the supporting column penetrates through the through hole and is exposed out of the upper end of the magnetic circuit system, and the supporting part is fixedly connected to the supporting column. The technical effect of the invention is that the acoustic performance of the sound production device is improved.

Description

Sound production device and earphone

Technical Field

The invention relates to the technical field of electroacoustic transduction, in particular to a sound production device.

Background

In recent years, consumer electronics have been rapidly developed, and electronic devices such as smart phones and VR devices have been recognized by consumers and are widely used. Those skilled in the art have made corresponding improvements to related accessories, such as earphones, etc., to meet the performance requirements of electronic products and the requirements of consumers on the product performance.

Sound generating devices are important electroacoustic transducer components in consumer electronics, and are widely used as speakers, earphones, and the like. As the performance of electronic products improves, there is also a necessary trend regarding the improvement of the acoustic performance of sound emitting devices. In order to satisfy better acoustic performance, the sound generating device is often required to be provided with a magnetic circuit system with larger size and stronger magnetic field intensity. In the sound generating device, the size of the voice coil and the size of the magnetic circuit system are matched with each other. However, the voice coil has large internal space and low utilization rate; when the amplitude of the voice coil is large, risks such as polarization, disconnection of the lead of the voice coil and the like are easily caused.

Therefore, there is a need for a new sound generating device to overcome the above-mentioned drawbacks.

Disclosure of Invention

One object of the present invention is to provide a new solution for a sound generating device.

According to a first aspect of the present invention, there is provided a sound generating device comprising: a magnetic circuit system, a through hole is formed at the center of the magnetic circuit system;

the vibration component comprises a vibration diaphragm, a voice coil and a centering support piece, the centering support piece comprises a supporting part, a fixing part and a connecting arm, the supporting part surrounds the fixing part, the connecting arm is connected between the fixing part and the supporting part, a vibration area is arranged in the vibration diaphragm, and the voice coil, the vibration area and the supporting part are connected;

the supporting column penetrates through the through hole and is exposed out of the upper end of the magnetic circuit system, and the fixing part is fixedly connected to the supporting column.

Optionally, the top end of the support column has two first electrical connection points, a lead is led out from the voice coil, and the lead is electrically connected with the first electrical connection points.

Optionally, a circuit trace extending from the supporting portion to the fixing portion through the connecting arm is formed in the centering support, the lead is electrically connected to the circuit trace through the supporting portion or the connecting arm, and the first electrical connection point is electrically connected to the circuit trace through the fixing portion.

Optionally, the bottom end of the supporting column has two second electrical connection points configured to be electrically connected with an external device, and the two second electrical connection points are electrically connected with the first electrical connection point through the inside of the supporting column.

Alternatively, the vibration regions of the voice coil and the diaphragm are respectively connected to both side surfaces of the support part.

Optionally, the centering branch piece includes four connecting arms, the four connecting arms are paired in pairs, and the two pairs of the supporting arms are distributed in an axisymmetric manner relative to the central axis of the centering branch piece.

Optionally, the fixing portions are a first fixing portion and a second fixing portion, one pair of the connecting arms is connected to the first fixing portion, and the other pair of the connecting arms is connected to the second fixing portion.

Optionally, the supporting column includes a plastic body portion with an inverted T-shaped side surface, the plastic body portion includes a stem and an assembling portion connected to a bottom of the stem, the stem passes through the through hole of the magnetic circuit system, and the assembling portion covers a bottom surface of the magnetic circuit system;

the support column is still including moulding plastics in two metalworks in the plastics body portion, the metalwork includes parallel first end and second end to and the intermediate part of connecting first end and second end, first end exposes the top surface of stem forms first electric connection point, the second end exposes the bottom surface of supporting part forms second electric connection point.

Optionally, the diameter of the outer periphery of the magnetic circuit system is a first diameter D1, the diameter of the part of the supporting column located in the through hole is a second diameter D2, and the second diameter D2 is less than or equal to 0.32 times the first diameter D1;

the diameter of the outer periphery of the magnetic circuit system is a first diameter D1, the diameter of the outer periphery of the sound generating device is a third diameter D3, and the ratio of the first diameter D1 to the third diameter D3 is greater than or equal to 0.65.

Optionally, the magnetic circuit system comprises a magnetic yoke, and a plurality of flanges extending towards the periphery of the magnetic yoke are formed at the top edge of the magnetic yoke;

the sounding device also comprises a bearing frame, wherein a hollow part is formed in the center of the bearing frame, and a positioning part is formed on the lower end face of the bearing frame;

the magnetic yoke is positioned and arranged at the hollow-out position from one side of the lower end face of the bearing frame, and the flange extends to the lower part of the bearing frame in the horizontal direction and is fixedly connected with the positioning part.

Optionally, the positioning portion includes a positioning groove formed on a lower end surface of the bearing frame, the positioning groove extends to the hollow portion, and the flange is embedded in the positioning groove.

Optionally, the bearing frame is made of a plastic material, and the positioning portion includes a heat-melting structure formed on a lower end surface of the bearing frame;

the hot melting structure is fixedly connected with the flange in a hot melting mode.

Optionally, the positioning portion further includes a positioning groove formed on a lower end surface of the bearing frame, the positioning groove extends to the hollow portion, the hot-melt structure is located in the positioning groove, and the flange is embedded in the positioning groove;

the shape of fretwork with the appearance phase-match of yoke, the upper end of yoke inlay in the fretwork, the yoke embedding the degree of depth of fretwork is equivalent to positioning groove's degree of depth.

The invention also provides an earphone, and the earphone is provided with the sound production device.

The voice coil has the technical effects that the possibility that the voice coil generates polarization in the sound generating device is reduced, and the acoustic performance of the sound generating device is improved.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, 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 invention and together with the description, serve to explain the principles of the invention.

Fig. 1 is a partial schematic structural view of a sound generating device according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a centering chip according to an embodiment of the present invention;

FIG. 3 is an exploded view of a portion of a sound generator provided in accordance with an embodiment of the present invention;

fig. 4 is a side sectional view of a sound emitting device according to an embodiment of the present invention.

FIG. 5 is a schematic diagram of a voice coil according to an embodiment of the present invention;

fig. 6 is an exploded view of a portion of a sound generator according to an embodiment of the present invention.

Detailed Description

Various exemplary embodiments of the present invention 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, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

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

Techniques, methods, and apparatus known to those 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 particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

Fig. 1 and 3 are a schematic view showing a partial structure and an exploded view of a sound generating device according to the present invention, fig. 2 is a schematic view showing a damper according to the present invention, fig. 4 is a side sectional view showing the sound generating device according to the present invention, and fig. 5 is a schematic view showing a voice coil according to the present invention. The structure, principle and the like of the sound generating device of the present invention will now be described in detail by taking fig. 1 to 5 as examples.

The present invention provides a sound generating apparatus, including: magnetic circuit system, vibration assembly and support column 30. The center of the magnetic circuit system is provided with a through hole which penetrates from the bottom end of the magnetic circuit system to the top of the magnetic circuit system. A magnetic gap is formed in the magnetic circuit system, and a magnetic field is formed in the magnetic gap and used for driving the vibration component to vibrate. The magnetic gap is annular and surrounds the periphery of the through hole.

The vibration assembly includes a diaphragm 21, a voice coil 22, and a damper 23. As shown in fig. 1 and 2, the damper 23 includes a support portion 231, a fixing portion 232, and a connecting arm 233, the support portion 231 is wound around the fixing portion 232, the shapes of the support portion and the fixing portion can be selected according to the shapes of the sound generating device and the voice coil, and the fixing portion may be similar to the shape of the support portion or may be changed to another shape. The connecting arms 233 are connected between the fixing portion 232 and the supporting portion 231, and the shape and number of the connecting arms are not limited in this embodiment.

The diaphragm 21 has a vibration region therein, and the vibration region is a region of the diaphragm 21 connected to the voice coil 22. The voice coil 22, the vibration region, and the support 231 are electrically connected to each other. An acoustic signal can be fed into the voice coil 22, and the voice coil 22 can vibrate under the action of the magnetic field of the magnetic circuit system. The edge of the diaphragm 21 is fixed in the sound generating device, the voice coil 22 is connected to the vibration region, and the voice coil 22 is suspended in the magnetic gap formed by the magnetic circuit system. When the voice coil vibrates, the voice coil can drive the vibrating diaphragm to vibrate together, so that the vibrating diaphragm vibrates to generate sound. In this embodiment, the supporting part of the centering support piece is connected with the voice coil, so that the voice coil is not deviated from the central position during vibration, and the voice coil is only reciprocated along the axial direction when being stressed, thereby avoiding the problem of polarization.

Further, the support pole 30 passes through the through hole and is exposed from the upper end of the magnetic circuit system. As shown in fig. 1 to 3, the top end of the supporting pole 30 is exposed from the top of the magnetic circuit system, and the supporting part 231 is fixed to the supporting pole 30. The support column 30 may further be provided with electrical connection points for connecting with leads of a voice coil to electrically connect an external device with the voice coil.

The sounding device provided by the invention is different from the prior art, and the connection mode of the centering disk, the voice coil and an external circuit is changed by changing the structure of the centering disk, so that the supporting part at the periphery of the centering disk is connected with the voice coil, and the utilization rate of a magnetic circuit system is improved. Meanwhile, the supporting column and the part used as a conducting signal are arranged in the through hole in the center of the magnetic circuit system, so that the space is saved. This kind of mode of setting helps avoiding the voice coil loudspeaker voice coil to produce the polarization in sound generating mechanism, can also improve sound generating mechanism's output under the unchangeable condition of sound generating mechanism whole volume to satisfy acoustic performance's requirement.

Optionally, the stiffener 23 includes at least three connecting arms 233, and each connecting arm 233 is distributed in a central symmetrical manner with respect to the center of the stiffener 23. Since the voice coil 22 has two leads electrically connected to an external circuit, and the two leads are drawn out at positions that are centrosymmetric with respect to the center of the voice coil, the pulling force of the leads on the voice coil is symmetric when the voice coil vibrates. And at least three connecting arms are distributed in a centrosymmetric mode relative to the center of the centering disk, so that the stability and balance of the centering disk connecting arms can be effectively improved, the risk of the voice coil generating polarization is reduced, the service life of the centering disk is prolonged, and the sound quality of the sound generating device is improved.

Specifically, the connecting arm 233 is bent from the supporting portion 231 and extends to the fixing portion 232. As shown in fig. 2, the connecting arm 233 extends to the fixing portion 232 at a certain bending, and the bending is designed in an arc shape, so that a region where stress is concentrated during bending is avoided, the possibility that the connecting arm cracks under vibration can be reduced, and the reliability of the centering disk can be improved.

Optionally, the fixing portions are a first fixing portion and a second fixing portion, one pair of the connecting arms is connected to the first fixing portion, and the other pair of the connecting arms is connected to the second fixing portion. The first fixing part and the second fixing part are distributed in the center of the centering branch piece in the same structure and size. The two fixing parts are arranged side by side and are opposite to the top ends of the supporting columns.

In a possible embodiment, the top end of the support column 30 has a first electrical connection point 33, and the voice coil is electrically connected to the first electrical connection point 33. As shown in fig. 1 and 2, the top end of the support pole 30 is exposed from the top of the magnetic circuit system, and the support pole 30 is used to introduce an acoustic signal to the voice coil 22. In this embodiment, the supporting column has an inverted T-shaped structure, the supporting column extends into the magnetic circuit system, and one end of the supporting column having the first electrical connection point is exposed from the top end of the magnetic circuit system toward the fixing portion of the centering support.

Specifically, a lead is led out from the voice coil. The lead is led out from the voice coil and then extends to the top end of the supporting column located in the central area of the voice coil in a bending extending mode. The number of the first electrical connection points 33 may be one or two, and the two first electrical connection points 33 are respectively located on the first fixing portion and the second fixing portion of the support column. Thus, the two lead wires can be respectively and correspondingly electrically connected with the first electric connection points one by one. The voice coil is conducted through the two leads and the first electric connection points correspondingly connected to form a signal loop.

The lead is extended in a V shape, the lead is designed into the V shape, the lead can have better deformability and is not easy to break and damage, the lead can be restored to the original shape after the voice coil stops vibrating, and the possibility of irreversible plastic deformation of the lead is reduced. The bent shape of the lead is not particularly limited, and in other embodiments, the lead may be designed to extend in an S-shape or in other shapes.

In practical applications, one end of the lead is fixedly connected to the first electrical connection point 33, and the other end of the lead is fixedly connected to the main body of the voice coil. When the voice coil vibrates, the two ends of the lead wire inevitably generate relative displacement and vibration. In this case, the lead wire extending by bending has a better deformability, and can be deformed in accordance with the vibration of the voice coil, thereby reducing the possibility of the voice coil being broken by the vibration. On the other hand, the lead wire can avoid the lead wire to produce too big effort of dragging to the voice coil loudspeaker voice coil through warping the buffering, reduces the influence of the effort of dragging to the amplitude of voice coil loudspeaker voice coil that its produced, improves the electric energy conversion rate of voice coil loudspeaker voice coil, guarantees sound generating mechanism's sound output loudness.

Further, the bottom end of the support column 30 has two second electrical connection points 32. As shown in fig. 4, the second electrical connection points 32 are configured to be electrically connected to an external device, and two of the second electrical connection points 32 are electrically connected to two of the first electrical connection points 33 through the inside of the support column 30. In practical application, the sound generating device provided by the invention needs to be assembled into other electronic equipment, such as a mobile phone, an earphone, a small-sized loudspeaker and the like. The sound generating device generally needs to receive sound signals from other devices and convert the sound signals into sound. By providing the second electrical connection point 32 at the bottom end of the support column, sound signals from an external device can be guided into the support column 30. Since the two second electrical connection points 32 are electrically connected with the two first electrical connection points 33, respectively, the sound signal can be transmitted to the lead wire through the second electrical connection points 32 and the first electrical connection points 33. Another advantage of this embodiment is that the second electrical connection point is formed at the bottom end of the support column, and the through hole penetrates through the magnetic circuit system, so that when the second electrical connection point is electrically connected with an external device, an electrical connector can be conveniently arranged from the bottom of the magnetic circuit system, and then electrically connected with the second electrical connection. The design mode is convenient for realizing electric connection and has higher conformity with the mode that the sound generating device is assembled on the external equipment.

In another possible embodiment, a circuit trace extending from the supporting portion 231 to the fixing portion 232 through the connecting arm 233 is formed in the supporting portion 23, the voice coil 22 is electrically connected to the circuit trace through the supporting portion 231 or the connecting arm 233, and the first electrical connection point 33 is electrically connected to the circuit trace through the fixing portion 232. Therefore, the support column is used as a conducting part for connecting the voice coil and an external circuit, and compared with the traditional connection mode, the support column is easier to form electric connection with an external electric connector, so that the reliability of the electric connection is improved; the support column is arranged in the magnetic circuit system, so that other spaces inside the sound generating device cannot be occupied, and the space utilization rate of the sound generating device is improved.

As shown in fig. 3 and 5, two lead connection terminals 221 are formed on two sides of the voice coil 22 close to the spider support portion 231, the two lead connection terminals 221 are oppositely disposed on two ends of the voice coil 22 and electrically connected to the spider 23, and a circuit trace on the spider 23 can connect the voice coil 22 with the first electrical connection point 33 on the support column 30, so as to be electrically connected to an external circuit. Like this, the voice coil loudspeaker voice coil need not longer lead wire can form the electricity with the support column and be connected, compares in longer voice coil loudspeaker voice coil lead wire, has reduced longer lead wire when the voice coil loudspeaker voice coil produces the vibration, and the lead wire is difficult to avoid producing relative displacement, dragging and the cracked possibility appears. Adopt this kind of embodiment, can effectively avoid the lead wire to the effort of dragging that the voice coil loudspeaker voice coil produced, reduce the influence that the effort of dragging produced the amplitude of voice coil loudspeaker voice coil, improve the electric energy conversion rate of voice coil loudspeaker voice coil, guarantee sound generating mechanism's sound output loudness.

Alternatively, as shown in fig. 3, the voice coil 22 and the vibration region of the diaphragm 21 are respectively attached to both side surfaces of the support portion 231. Since the supporting portion 231 is located at the periphery of the spider 23, and the two side surfaces of the supporting portion 231 are connected to the vibration regions of the voice coil 22 and the diaphragm 21, respectively, the sizes of the voice coil and the diaphragm can be increased, that is, the size of the magnetic circuit system in the sound generating apparatus can be enlarged. This helps to improve the utilization of the magnetic circuit system of the sound generating device and the acoustic quality of the sound generating device.

Preferably, the centering branch 23 includes four connecting arms 233. As shown in fig. 2, two of the four connecting arms 233 are paired, and two pairs of the supporting arms 233 are distributed in axial symmetry with respect to the central axis of the centering branch piece 23. In this kind of distribution mode, two liang of support arm stability and equilibrium that are pairwise are better, can reduce the risk that the voice coil loudspeaker voice coil produced polarization, help improving sound generating mechanism's sound quality.

Alternatively, as shown in fig. 3 and 4, the support column may include a plastic body portion with an inverted T-shaped side surface. The plastic body part may comprise a stem and a fitting part 31 connected to the bottom of the stem. The core column penetrates through the through hole of the magnetic circuit system and is used for realizing the function of the electric connection. The mounting portion 31 is located on the bottom surface of the magnetic circuit system, and provides a supporting function for the magnetic circuit system.

The support column further comprises two metal pieces, and the two metal pieces are fixed in the plastic body portion in an injection molding mode. The metal piece has a first end portion, a second end portion and a middle portion. The first end part and the second end part on the same metal piece are in relatively parallel postures, and the middle part is connected between the first end part and the second end part. As shown in fig. 3, the first end portion is used for forming the first electrical connection point 33, and the second end portion is used for forming the second electrical connection point 32. The first end portion may be exposed from a top surface of the plastic body portion and the second end portion is exposed from a bottom surface of the plastic body portion. The configuration mode is convenient for the lead and external equipment to realize signal conduction through the metal piece. In addition, the middle part of the metal piece is injected inside the plastic body part, so that the metal piece is not easy to interfere with other conductive and magnetic conductive parts in the sound generating device.

The diameter of the outer periphery of the magnetic circuit system is a first diameter D1, and the diameter of the part of the supporting column located in the through hole is a second diameter D2. Preferably, the second diameter D2 is less than or equal to 0.32 times the first diameter D1. The portion of the magnetic circuit system close to the magnetic gap is the portion that contributes most to the generation of electromagnetic force, and the through hole is located away from the magnetic gap. Therefore, the through hole is formed in the central part, far away from the magnetic gap, of the magnetic circuit system, and the support column is placed, so that the influence of the structural loss of the magnetic circuit system on the generation of the electromagnetic field can be effectively avoided. Preferably, the support posts are narrowed to the second diameter D2 as much as possible within the process control. In the range of D2 ≦ 0.32 × D1, the substantial negative influence on the strength of the generated electromagnetic field can be avoided, and the sensitivity loss is below 0.2 dB.

The diameter of the outer periphery of the sound generator is a third diameter D3. In a preferred embodiment of the invention, the ratio of the first diameter D1 to the third diameter D3 is greater than or equal to 0.65. In the prior art, the frame and the shell which are positioned at the periphery of the magnetic circuit system are injected with circuit devices with pads for electric connection, so that a large space at the periphery of the magnetic circuit system is occupied. In the case where the space of the entire sound generating device is limited, the available space left for the magnetic circuit system itself is small. The voice coil is electrically connected with the outside by the support column arranged at the center of the magnetic circuit system, and other electric connections are not required to be arranged at the periphery of the magnetic circuit system, so that the space is saved at the periphery of the magnetic circuit system. Compared with the prior art, the size of the magnetic circuit system can be designed to be larger, and the performance of the magnetic circuit system is improved. Preferably, the ratio of the first diameter D1 to the third diameter D3 is greater than or equal to 0.65. Optionally, the ratio of the first diameter D1 to the third diameter is 0.75.

The sound emitting device further comprises a carrier frame 4. The bearing frame 4 is used for providing supporting and positioning functions for the magnetic circuit system and other parts of the sound generating device, so that the parts can be fixedly connected into an integral device. The center of the carrying frame 4 may be formed with a hollow 42, and the magnetic circuit system is disposed at the hollow 42.

As shown in fig. 3 and 4, the magnetic circuit system may further include a yoke 11, where the yoke 11 has a bottom wall and an annular side wall extending from the bottom wall. The yoke 11 encloses a receiving space capable of carrying other components. A plurality of flanges 111 are formed at the top of the side walls to extend toward the periphery of the side walls. Wherein the flange 111 is used for forming a fixed connection with the carrying frame 4. Alternatively, the yoke and the flange 111 are integrally press-molded members. The structure reliability of integrative stamping forming is high, is more convenient for assemble moreover. Of course, the yoke and the flange may be fixedly connected together by other means known in the art, and the present invention is not limited thereto.

As shown in fig. 6, a positioning portion is formed on a lower end surface of the carrying frame 4. The yoke 11 is disposed at the hollow 42 from one side of the lower end surface of the carrying frame 4. The flange 111 corresponds to the position of the positioning portion, the flange 111 extends to the bottom of the carrier frame 4 in the horizontal direction, and the flange and the carrier frame form a fixed connection, so that the magnetic circuit system is fixedly connected with the carrier frame 4.

As shown in fig. 6, the positioning part preferably includes a positioning groove 41 formed on the lower end surface of the bearing frame 4, and the positioning groove 41 is recessed upward from the lower end surface of the bearing frame 4 by a distance. And the positioning groove extends along the surface of the lower end surface and extends to the hollow part 42. I.e. to the edges of the cutouts 42.

Alternatively, the carrying frame 4 is made of a plastic material, and the positioning portion includes a heat-fusible structure 43 formed on the lower end surface of the carrying frame 4. When the yoke 11 is assembled with the carrying frame 4, the flange 111 is at a position corresponding to the heat-fusible structure 43, and the flange 111 can contact the heat-fusible structure 43. On the finished device of the sound production device, the hot melting structure 43 is subjected to hot melting treatment, and the hot melting structure is covered on the flange 111 and is fixedly connected with the flange 111. The flange 111 and the hot-melting structure 43 are connected in a hot-melting manner to realize reliable fixed connection, so that the structural reliability of the sound production device is ensured.

As shown in fig. 6, the positioning portion may preferably include the heat-fusible structure 43 and the positioning groove 41. The hot melting structure 43 is located in the positioning groove 41, and the flange 111 is embedded in the positioning groove 41 and is fixedly connected with the hot melting structure 43 in the positioning groove 41 in a hot melting manner. In the preferred embodiment, on the one hand, the positioning groove 41 and the flange 111 are matched in a way that the positioning accuracy of the bearing frame 4 and the magnetic circuit system can be improved. On the other hand, when the heat-fusible structure 43 is subjected to the heat-fusible treatment, the heat-fusible structure 43 may flow into the positioning groove 41 and wrap around the flange 111, thereby improving the reliability of the fixed connection between the carrier frame 4 and the yoke. Furthermore, the positioning groove accommodates the hot melting structure, so that the problem that at least one part of the hot melting structure flows to a position far away from the flange after being melted by hot melting can be avoided, and the product appearance is prevented from being flawed due to the flowing of the hot melting structure.

Preferably, the shape of the hollow 42 matches with the shape of the magnetic circuit system and the yoke 11, so that the yoke 11 can form a good butt joint or sealing connection with the carrying frame 4. For example, the magnetic circuit system may have a cylindrical structure as a whole. The hollow 42 on the carrying frame 4 is circular, so that the magnetic circuit system is butted at the hollow 42.

Further, in the embodiment in which the positioning groove 41 is formed on the lower end surface of the carrying frame 4, since the flange 111 is inserted into the positioning groove 41 by a distance corresponding to the depth of the positioning groove 41, the end of the side wall of the yoke 11 is closer to the hollow 42. If the flange 111 is flush with the top of the side wall of the yoke 11 or slightly lower than the top of the side wall of the yoke 11, the top of the side wall of the yoke 11 is embedded in the hollow 42. In this embodiment, both the positioning accuracy and the sealing property between the yoke and the carrier frame 4 can be improved. In addition, the technical characteristic that the flange is matched with the lower end face of the bearing frame is adopted, and the plastic shell structure for encapsulating the magnet yoke on the bearing frame is eliminated, so that even if the top of the side wall of the magnet yoke is embedded into the hollow part for a short distance, the situation that too many overlapped parts exist between the bearing frame and the magnet yoke and too much space is occupied is avoided. In the design of the present invention, there is still enough space for increasing the volume of the magnetic circuit system. Optionally, the flange is flush with the top of the side wall of the magnetic yoke, and the depth of the magnetic yoke embedded in the hollow corresponds to the depth of the positioning groove.

Because the bearing frame is made of metal materials and has higher rigidity, when the positioning groove is arranged on the bearing frame, the depth of the positioning groove can be flexibly selected according to actual needs as long as the structural strength of the bearing frame is not damaged. The invention is not restricted to this, and in practical applications, the depth of the positioning groove may also be designed according to the actual structural strength of the bearing frame and the actual thickness of the flange.

Preferably, the thickness of the flange is less than or equal to the depth of the positioning groove. The matching relationship between the thickness of the flange and the depth of the positioning groove influences the connection strength between the bearing frame and the magnetic yoke. In this preferred embodiment, the lower surface of the flange can be sunk into the positioning groove or flush with the lower end surface of the bearing frame, and this design can make the flange buried in the positioning groove, thereby improving the connection reliability. The present invention does not restrict that the thickness of the flange must be less than or equal to the depth of the positioning groove.

The invention also provides an earphone product, and the earphone is provided with the sound production device. In a limited space in an earphone product, the sound generating device designed by the invention can more effectively utilize the space and is provided with a magnetic circuit system and/or a voice coil with larger volume so as to enhance the acoustic performance of the sound generating device and further meet the performance requirement of the earphone. The headset may be an in-ear headset or a semi-in-ear headset.

Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. 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 invention. The scope of the invention is defined by the appended claims.

Claims

1. A sound generating device, comprising:

a magnetic circuit system, a through hole is formed at the center of the magnetic circuit system;

the vibration assembly comprises a vibration diaphragm, a voice coil and a centering sheet, the centering sheet comprises a supporting part, a fixing part and a connecting arm, the supporting part surrounds the fixing part, the connecting arm is connected between the fixing part and the supporting part, a vibration area is arranged in the vibration diaphragm, the voice coil is connected to the vibration area, and the supporting part of the centering sheet is connected with the voice coil;

the supporting column penetrates through the through hole and is exposed out of the upper end of the magnetic circuit system, and the fixing part is fixedly connected to the supporting column;

the top end of the supporting column is provided with two first electric connection points, a lead is led out from the voice coil, and the lead is electrically connected with the first electric connection points;

the bottom end of the supporting column is provided with two second electric connection points, the second electric connection points are configured to be electrically connected with external equipment, and the two second electric connection points are electrically connected with the two first electric connection points through the inside of the supporting column respectively.

2. The apparatus according to claim 1, wherein the centering branch piece has a circuit trace formed therein, the circuit trace extending from the supporting portion to the fixing portion via the connecting arm, the lead is electrically connected to the circuit trace via the supporting portion or the connecting arm, and the first electrical connection point is electrically connected to the circuit trace via the fixing portion.

3. The sound generating apparatus according to claim 1, wherein the vibration regions of the voice coil and the diaphragm are respectively attached to both side surfaces of the support portion.

4. The apparatus according to claim 2, wherein said centering disk comprises four connecting arms, two of said four connecting arms are paired, and two pairs of said connecting arms are disposed in axial symmetry with respect to a central axis of said centering disk.

5. The apparatus according to claim 2, wherein said fixed portions are a first fixed portion and a second fixed portion, one pair of said connecting arms being connected to said first fixed portion, and the other pair of said connecting arms being connected to said second fixed portion.

6. The sound generating apparatus as claimed in claim 1, wherein the supporting pillar comprises a plastic body portion with an inverted T-shaped side surface, the plastic body portion comprises a stem and a fitting portion connected to a bottom of the stem, the stem passes through the through hole of the magnetic circuit system, and the fitting portion covers a bottom surface of the magnetic circuit system;

7. The sound generating apparatus as claimed in claim 6, wherein the outer periphery of the magnetic circuit system has a diameter of a first diameter D1, the portion of the supporting column located in the through hole has a diameter of a second diameter D2, the second diameter D2 being less than or equal to 0.32 times the first diameter D1;

8. The sound generating apparatus as claimed in claim 6, wherein the magnetic circuit system comprises a yoke, and a plurality of flanges extending to the periphery of the yoke are formed at the top edge of the yoke;

9. The sound generating apparatus as claimed in claim 8, wherein the positioning portion comprises a positioning groove formed on a lower end surface of the supporting frame, the positioning groove extends to the hollow portion, and the flange is embedded in the positioning groove.

10. The sound generating apparatus according to claim 8, wherein said carrying frame is made of a plastic material, and said positioning portion comprises a heat-fusible structure formed on a lower end surface of said carrying frame;

11. The sound generating apparatus according to claim 10, wherein the positioning portion further comprises a positioning groove formed on a lower end surface of the carrying frame, the positioning groove extends to the hollow, the heat-fusible structure is located in the positioning groove, and the flange is embedded in the positioning groove;

12. A headset, characterized in that the sound-generating device according to any one of claims 1-11 is arranged in the headset.