CN118102187A - Sounding monomer, sounding module and electronic product - Google Patents

Abstract

The invention discloses a sounding unit, which comprises a first sounding unit, a second sounding unit, a magnetic circuit system and an injection molding part, wherein the first sounding unit comprises an annular first vibrating diaphragm and a first voice coil; the magnetic circuit system comprises a central magnetic circuit and a side magnetic circuit positioned at the periphery of the central magnetic circuit, and the central magnetic circuit is provided with an avoidance part; the inside second magnetic gap that has of center magnetic circuit, second voice coil loudspeaker voice coil are flat voice coil and axis perpendicular to second vibrating diaphragm's vibration direction, and second voice coil loudspeaker voice coil inserts the second magnetic gap at least partially, and in the portion was located dodging to the portion of moulding plastics at least partially, the portion of moulding plastics was embedded to have electric connection spare, and electric connection spare both ends were connected with second voice coil loudspeaker voice coil and external circuit electricity respectively. The sounding monomer of the invention effectively improves the high-frequency performance and widens the sounding frequency band.

Description

Sounding monomer, sounding module and electronic product

Technical Field

The invention relates to the electroacoustic field, in particular to a sounding monomer, a sounding module and an electronic product.

Background

The micro-speaker is widely applied to modern portable, communication and intelligent devices due to the small size, and the requirements of users on high sound quality are increasing, especially for some portable intelligent devices, the users are not satisfied with the presence or absence of sound, but more pursue good sound quality.

A complete micro sounding module consists of micro sounding monomers, front and rear sound cavities and the like; when the micro-speaker works, the front sound cavity is subjected to low-pass filtering, and when the frequency of a driving signal is larger than the resonance frequency (Fh) of the front sound cavity, the loudness of the speaker is greatly reduced. At present, the front cavity resonance point of the miniature sound generating module in the intelligent mobile terminal is mostly smaller than 6000Hz, so that the effective frequency band of the miniature loudspeaker is narrowed, the tone quality is monotonous, and the tone quality is poor.

Disclosure of Invention

The invention aims to provide a sounding monomer which can effectively improve the high-frequency performance and widen the sounding frequency band while ensuring that the middle and low sound performance is not reduced.

In order to achieve the above and other objects, the present invention provides a sound producing unit, which comprises a first sound producing unit, a second sound producing unit, a magnetic circuit system and an injection molding part, wherein the first sound producing unit comprises an annular first vibrating diaphragm and a first voice coil connected with the first vibrating diaphragm, the second sound producing unit comprises a second vibrating diaphragm and a second voice coil connected with the second vibrating diaphragm, the second vibrating diaphragm is positioned at the inner periphery of the first vibrating diaphragm, and the first voice coil and the second voice coil vibrate along a first direction;

The magnetic circuit system comprises a central magnetic circuit and a side magnetic circuit which is positioned at the periphery of the central magnetic circuit, wherein the central magnetic circuit and the side magnetic circuit are arranged at intervals, a first magnetic gap is formed between the central magnetic circuit and the side magnetic circuit, one side of the first voice coil, which is away from the first vibrating diaphragm, is inserted into the first magnetic gap, and the central magnetic circuit is provided with an avoidance part which is communicated with the inner space and the outer space of the sounding monomer;

The inside of the central magnetic circuit is provided with a second magnetic gap, the second voice coil is a flat voice coil, the axis of the second voice coil extends along a second direction perpendicular to the first direction, and one side of the second voice coil, which is away from the second vibrating diaphragm, is inserted into the second magnetic gap;

At least part the injection molding part is arranged in the avoidance part, an electric connecting piece is embedded in the injection molding part, and two ends of the electric connecting piece are respectively electrically connected with the second voice coil and an external circuit.

Optionally, the relief portion and the injection molded portion each extend in the first direction.

Optionally, the number of the injection molding parts is two, the two injection molding parts are located at two ends of the second voice coil along a third direction perpendicular to the first direction and the second direction respectively, and the two injection molding parts are located at two opposite sides of the second voice coil along the second direction respectively.

Optionally, the central magnetic circuit includes a first magnetic conductive plate, a first magnet, a second magnetic conductive plate, and a second magnet sequentially stacked along the first direction, and the second diaphragm is disposed opposite to the first magnetic conductive plate.

Optionally, the injection molding part is fixedly connected with the first magnetic conduction plate.

Optionally, the device further comprises a fixing ring, wherein the fixing ring is arranged on one side of the first magnetic conduction plate, which is away from the first magnet, and the peripheral edge of the second vibrating diaphragm is fixed on one side of the fixing ring, which is away from the first magnetic conduction plate;

and/or one end of the first vibrating diaphragm, which is close to the second vibrating diaphragm, is fixed between the first magnetic conduction plate and the first magnet.

Optionally, the central magnetic circuit includes a first magnet, a second magnetic conductive plate, and a second magnet sequentially stacked along the first direction, and the second diaphragm is disposed opposite to the first magnet.

Optionally, the device further comprises a fixing ring, the fixing ring is arranged on one side of the first magnet, which is away from the second magnetic conduction plate, the second vibrating diaphragm is fixed on one side of the fixing ring, which is away from the first magnet, and the injection molding part is fixedly connected with the fixing ring.

Optionally, an end of the first diaphragm, which is close to the second diaphragm, is fixed between the fixing ring and the first magnet.

Optionally, the first magnetic conductive plate includes two openings, two openings correspond to two injection molding parts, and one end of the electric connecting piece, which is close to the second vibrating diaphragm, is exposed to the openings.

Optionally, the magnetic circuit system further comprises a magnetic yoke, the central magnetic circuit and the side magnetic circuits are all fixed on the same side of the magnetic yoke, a limiting hole is formed in the magnetic yoke, one end, away from the second vibrating diaphragm, of the injection molding part is fixed with the limiting hole, and one end, away from the second vibrating diaphragm, of the electric connecting piece is exposed to the limiting hole.

Optionally, the circuit board further comprises a circuit board, the circuit board comprises a body part and a welding piece which is arranged on the body part and is electrically connected with the electric connecting piece, a groove is formed in one side, away from the central magnetic circuit, of the magnetic yoke, and at least part of the circuit board is contained in the groove.

In order to achieve the above and other objects, the present invention further provides a sound module, which includes a housing and the sound unit located in the housing.

In order to achieve the above and other objects, the present invention further provides an electronic product, which includes the above sounding module, or the electronic product includes the above sounding monomer.

The sound generating unit comprises a first sound generating unit, a second sound generating unit, a magnetic circuit system and an injection molding part, wherein the first sound generating unit comprises an annular first vibrating diaphragm and a first voice coil connected with the first vibrating diaphragm, the second sound generating unit comprises a second vibrating diaphragm and a second voice coil connected with the second vibrating diaphragm, the second vibrating diaphragm is positioned at the inner periphery of the first vibrating diaphragm, and the first voice coil and the second voice coil vibrate along a first direction; the magnetic circuit system comprises a central magnetic circuit and a side magnetic circuit which is positioned at the periphery of the central magnetic circuit, wherein the central magnetic circuit and the side magnetic circuit are arranged at intervals, a first magnetic gap is formed between the central magnetic circuit and the side magnetic circuit, one side of the first voice coil, which is away from the first vibrating diaphragm, is inserted into the first magnetic gap, and the central magnetic circuit is provided with an avoidance part which is communicated with the inner space and the outer space of the sounding monomer; the inside second magnetic gap that has of center magnetic circuit, the second voice coil loudspeaker voice coil is flat voice coil and axis along the perpendicular to the second direction of first direction extends, the second voice coil loudspeaker voice coil deviates from one side of second vibrating diaphragm inserts the second magnetic gap, at least part the injection molding part is located dodge in the portion, the injection molding part all has embedded electric connection spare, electric connection spare both ends respectively with second voice coil loudspeaker voice coil and external circuit electricity are connected. The first sound generating unit is a bass unit, the second sound generating unit is a treble unit, the treble and bass sound generating units are integrated together, the middle and low sound performance is not reduced, the high-frequency performance is effectively improved, and the sound generating frequency band is widened; in addition, the second voice coil is a flat voice coil and is inserted into a second magnetic gap in the central magnetic circuit, so that the driving force is effectively improved, the acoustic performance is further improved, and the volume of a product can be effectively reduced by the flat voice coil; through setting up injection molding and electric connector, realize from sound production monomer bottom with the electricity is accomplished to second sound production unit to the assembly degree of difficulty that second sound production unit and outside electricity are connected has been reduced, assembly efficiency is promoted.

In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.

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 block diagram of a sounding monomer according to an embodiment of the present invention.

Fig. 2 is a bottom structure diagram of a sounding monomer according to an embodiment of the present invention.

Fig. 3 is a simplified exploded view of a sound emitting unit according to an embodiment of the present invention.

Fig. 4 is a detailed exploded view of a sounding monomer according to an embodiment of the present invention.

Fig. 5 is a cross-sectional view of a sounding monomer according to an embodiment of the present invention.

Fig. 6 is a cross-sectional view of a sound producing monomer forward placement provided by an embodiment of the present invention.

Fig. 7 is a cross-sectional view of a magnetic circuit system and a second voice coil of a sounding monomer according to an embodiment of the present invention.

Fig. 8 is a cross-sectional view of a sound emitting unit according to another embodiment of the present invention.

Fig. 9 is a top view of a magnetic circuit system of a sounding monomer according to an embodiment of the present invention.

Fig. 10 is a top view of a center magnetic circuit and a second voice coil of a sounding unit according to an embodiment of the present invention.

Fig. 11 is a structural diagram of a first magnet of a sounding unit according to an embodiment of the present invention.

Fig. 12 is a top view of a first magnet of a sound-emitting unit according to another embodiment of the present invention.

Fig. 13 is an exploded view of a magnetic circuit system of a sounding monomer according to an embodiment of the present invention.

Fig. 14 is an exploded view of a magnetic circuit system of a sounding unit according to another embodiment of the present invention.

Fig. 15 is a bottom structure diagram of a central magnetic circuit and an injection molding part of a sounding monomer according to an embodiment of the present invention.

Fig. 16 is an exploded view of a second voice coil electrical connection structure of a sounding unit according to an embodiment of the present invention.

Fig. 17 is a cross-sectional view of a sound emitting unit provided in an embodiment of the present invention.

Fig. 18 is an exploded view of the second diaphragm, the first magnetic conductive plate and the injection molding part of the sounding monomer according to the embodiment of the present invention.

Fig. 19 is a cross-sectional view of a sound module according to an embodiment of the present invention.

Reference numerals illustrate:

10 is a first sound generating unit, 11 is a first reinforcing part, 12 is a first folding ring, 121 is a first inner fixing part, 122 is a first outer fixing part, 13 is a second folding ring, 131 is a second inner fixing part, 132 is a second outer fixing part, 14 is a first voice coil, 15 is a centering support piece, 20 is a second sound generating unit, 200 is a planar vibrating diaphragm, 21 is a second reinforcing part, 22 is a third folding ring, 221 is a third inner fixing part, 222 is a third outer fixing part, 23 is a second voice coil, 231 is a lead wire, 24 is an injection molding part, 241 is an electric connecting piece, 2411 is a welding part, 25 is a fixing ring, 30 is a magnetic circuit system, 31 is a central magnetic circuit, 311 is a first magnetic conductive plate, 3111 is an opening, 3112 is a protruding ring, 3113 is a concave portion, 312 is a first magnet, 3121 is a first magnet, 3122 is a second magnet, 3123 is a third magnet, 3124 is a sixth magnet, 3125 is a seventh magnet, 3127 is a unfilled corner, 313 is a second magnetic conductive plate, 314 is a second magnet, 3141 is a fourth magnet, 3142 is a fifth magnet, 3143 is an eighth magnet, 3144 is a ninth magnet, 315 is an avoiding portion, 316 is an avoiding portion, 32 is a side magnetic circuit, 321 is a side magnetic conductive plate, 322 is a side magnet, 33 is a yoke, 331 is a limiting hole, 332 is a groove, 40 is a housing, 50 is a circuit board, 51 is a weldment, and 60 is a casing.

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

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

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

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

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

As shown in fig. 1-7, the present invention provides a sounding monomer, comprising: the first sound generating unit 10, the second sound generating unit 20, the magnetic circuit system 30 and the injection molding part 24.

The first sound generating unit 10 includes a first annular diaphragm and a first voice coil 14 connected to the first diaphragm, the second sound generating unit 20 includes a second diaphragm and a second voice coil 23 connected to the second diaphragm, the second diaphragm is located at an inner periphery of the first diaphragm, the first voice coil 14 and the second voice coil 23 vibrate along a first direction, and the first direction may be a vertical direction.

The magnetic circuit system 30 includes a central magnetic circuit 31 and a side magnetic circuit 32 located at the outer periphery of the central magnetic circuit 31, the central magnetic circuit 31 and the side magnetic circuit 32 are spaced apart, a first magnetic gap is formed between the central magnetic circuit 31 and the side magnetic circuit 32, one side of the first voice coil 14 facing away from the first diaphragm is inserted into the first magnetic gap, and the central magnetic circuit 31 has a avoiding portion 315 communicating the inner space and the outer space of the sounding unit; the inside second magnetic gap that has of central magnetic circuit 31, second voice coil 23 is flat voice coil and the axis is along the perpendicular to the second direction of first direction extends, second voice coil 23 deviates from one side of second vibrating diaphragm inserts the second magnetic gap, at least part injection molding portion 24 is located dodge portion 315 is interior, injection molding portion 24 is embedded to have electric connector 241, injection molding portion 24 with electric connector 241 all extends along the first direction or is the direction of certain contained angle with the first direction and extends, electric connector 241 both ends respectively with second voice coil 23 and external circuit electricity are connected.

Optionally, the first sound generating unit 10 and the second sound generating unit 20 may be coaxially arranged, the first sound generating unit 10 may be a bass unit, and the second sound generating unit 20 may be a treble unit, so that the treble sound generating modules may be integrated together, the performance of middle bass is not reduced, the high-frequency performance is effectively improved, and the sound generating frequency band is widened; in addition, since the second voice coil 23 is a flat voice coil, the second magnetic gap inserted into the center magnetic circuit 31 effectively increases the driving force, thereby improving the acoustic performance, and the flat voice coil can effectively reduce the product volume, thereby contributing to the slim and lightweight design of the product; through setting up injection molding part 24 and electric connector 241, realize from sound production monomer bottom with the second sound production unit 20 accomplishes the electricity and is connected to the assembly degree of difficulty that second sound production unit 20 is connected with outside electricity has been reduced, assembly efficiency is promoted.

In one embodiment, the avoidance portion 315 and the injection molding portion 24 both extend along the first direction, so that the structure is simple and installation is convenient. It will be understood, of course, that along the first direction, the extending direction of the avoiding portion 315 and the injection molding portion 24 may also form a certain included angle with the first direction, and may be selected and set according to actual use requirements, which is not particularly limited in the present invention.

In one embodiment, the number of the injection molding parts 24 is two, along the third direction perpendicular to the first direction and the second direction respectively, the two injection molding parts 24 are located at two ends of the second voice coil 23, and along the second direction, the two injection molding parts 24 are located at two opposite sides of the second voice coil 23 respectively, so that two leads of the second voice coil 23 are electrically connected conveniently, the two injection molding parts 24 are in central symmetry with the first direction as an axis, uniform central symmetry of magnetic circuits at two sides of the second voice coil 23 is ensured, stress is balanced, and polarization is prevented.

In one embodiment, as shown in fig. 10, the central magnetic circuit 31 has a through hole that forms the second magnetic gap. The through hole design is convenient for the flat second voice coil 23 to insert, and the two sides of the second voice coil 23 are provided with magnetic circuits, so that higher magnetic field intensity can be provided for the second voice coil 23.

Further, as shown in fig. 6, the central magnetic circuit 31 has a first magnetic component, a second magnetic component, a third magnetic component and a fourth magnetic component, where the first magnetic component, the second magnetic component, the third magnetic component and the fourth magnetic component enclose to form the through hole, the first magnetic component and the second magnetic component are located at two sides of the second voice coil 23 along the second direction, for example, the second direction may be a horizontal short side direction, and the third magnetic component and the fourth magnetic component are located at two sides of the second voice coil 23 along the third direction, for example, the third direction may be a horizontal long side direction. The four magnetic components comprise magnets, and the magnets can be one or two or even more, and the two or even more magnets are arranged along the first direction; the magnetic assembly further includes a magnetic conductive plate interposed between adjacent two of the magnets to guide magnetic lines of force more intensively through the second voice coil 23.

Further, the first magnetic component, the second magnetic component, the third magnetic component and the fourth magnetic component are of independent structures, namely the magnetic components are independent relatively and assembled flexibly; or the first magnetic component and the third magnetic component are integrally formed, the second magnetic component and the fourth magnetic component are integrally formed, for example, two magnetic components are combined into an L shape (the two magnetic components are vertically distributed), and two L-shaped structures are enclosed to form a through hole, so that the assembly complexity is reduced, and the assembly precision and the assembly speed are improved; or the first magnetic component, the second magnetic component, the third magnetic component and the fourth magnetic component are integrally formed, so that the assembly precision and the assembly speed can be further improved, and the assembly efficiency is improved.

In another embodiment, the central magnetic circuit 31 includes two magnetic components, which are spaced apart to form the second magnetic gap, and are disposed on both sides of the second voice coil 23 along the second direction. Thus, magnetic components on two sides of the second voice coil 23 along the third direction can be saved, the cost is reduced, and the structure is simpler.

In one embodiment, as shown in fig. 6, the central magnetic circuit 31 includes a first magnetic conductive plate 311, a first magnet 312, a second magnetic conductive plate 313 and a second magnet 314 stacked in sequence along the first direction, the second diaphragm is disposed opposite to the first magnetic conductive plate 311, a second magnetic gap is disposed in the middle of the central magnetic circuit 31, one side of the second voice coil 23 far away from the second diaphragm is inserted into the second magnetic gap, the gap of the first magnetic conductive plate 311 forms an upper magnetic gap, the gap of the second magnetic conductive plate 313 forms a lower magnetic gap, the second voice coil 23 has an upper driving edge and a lower driving edge, the upper driving edge is located in the upper magnetic gap, the lower driving edge is located in the lower magnetic gap, and the central magnetic circuit 31 drives the upper driving edge and the lower driving edge of the second voice coil 23 at the same time, so that a stronger driving force can be obtained, and the acoustic performance of the product is improved.

In some embodiments of the present invention, the sounding unit further includes a fixing ring 25 disposed on a side of the first magnetic conductive plate 311 facing away from the first magnet 312, and the outer periphery of the second diaphragm is fixed on a side of the fixing ring 25 facing away from the first magnetic conductive plate 311.

Specifically, a fixing ring 25 is arranged above the edge of the first magnetic conduction plate 311, the second vibrating diaphragm is positioned on the fixing ring 25, and by arranging the fixing ring 25, the distance between the second vibrating diaphragm and the first magnetic conduction plate 311 can be increased, so that a deformation space is provided for the downward vibration of the second vibrating diaphragm, and the outer side edge of the fixing ring 25 is aligned with the outer side edge of the first magnetic conduction plate 311, so that the assembly is convenient; in another example, the edge of the first magnetic conductive plate 311 protrudes upward to form a protruding ring 3112, the second diaphragm is fixed on the protruding ring 3112, the protruding ring 3112 also provides a deformation space for the second diaphragm to vibrate downward, the protruding ring 3112 is a part of the first magnetic conductive plate 311, the installation of the fixing ring 25 is omitted, and the assembly accuracy and efficiency are improved.

In one embodiment, the injection molding portion 24 is fixedly connected to the first magnetic conductive plate 311, and the injection molding portion 24 and the first magnetic conductive plate 311 are fixed by injection molding or bonding. The second sounding unit 20, the first magnetic conduction plate 311 and the injection molding part 24 are fixedly combined into a module, and the module is integrally inserted into the central magnetic circuit 31 during installation, so that the assembly is convenient.

In another embodiment, as shown in fig. 8, the central magnetic circuit 31 includes a first magnet 312, a second magnetic conductive plate 313 and a second magnet 314 stacked in sequence along the first direction, the second diaphragm is disposed opposite to the first magnet 312, a gap is formed in the middle of the central magnetic circuit 31, at least a portion of the second voice coil 23 is inserted into the gap, the gap of the first magnet 312 forms an upper magnetic gap, the gap of the second magnetic conductive plate 313 forms a lower magnetic gap, the second voice coil 23 has an upper driving edge and a lower driving edge, the upper driving edge is located in the upper magnetic gap, the lower driving edge is located in the lower magnetic gap, and the central magnetic circuit 31 drives the upper driving edge and the lower driving edge of the second voice coil 23 at the same time, so that a stronger driving force can be obtained, and the acoustic performance of the product is improved.

In a specific embodiment, a fixing ring 25 is disposed between the second diaphragm and the first magnet 312, the fixing ring 25 is disposed on one side of the first magnet 312 away from the second magnetic conductive plate 313, the second diaphragm is fixed on one side of the fixing ring 25 away from the first magnet 312, the outer periphery of the second diaphragm is fixed on the fixing ring 25, optionally, one end of the first diaphragm, which is close to the second diaphragm, is fixed between the fixing ring 25 and the first magnet 312, that is, the inner periphery of the first diaphragm is fixed between the first magnet 312 and the fixing ring 25, two sides of the fixing ring 25 are respectively bonded and fixed with the first diaphragm and the second diaphragm, and the distance between the second diaphragm and the first magnetic conductive plate 311 is enlarged by the fixing ring 25 to provide a deformation space for the downward vibration of the second diaphragm. In this embodiment, the first magnetic conductive plate 311 is not disposed above the first magnet 312, so that the thickness of the product can be further reduced. Simultaneously, injection molding portion 24 and solid fixed ring 25 fixed connection, injection molding portion 24 and solid fixed ring 25 pass through injection molding or modes such as bonding, and second sound generating unit 20 and solid fixed ring 25, injection molding portion 24 are fixed to be combined into a module, and the whole central magnetic circuit 31 that inserts during the installation is convenient for assemble.

Further, as shown in fig. 7, the first magnet 312 includes a first magnet 3121, a second magnet 3122 and a third magnet 3123 having a magnetization direction parallel to the first direction, the second magnet 3122 and the third magnet 3123 are located at one side of the second voice coil 23 along the second direction, the first magnet 3121 is located at the other side of the voice coil, and the third magnet 3123 is located at one side of the second magnet 3122 away from the first magnet 3121; the magnetization direction of the first magnet 3121 is opposite to the magnetization direction of the second magnet 3122 and the same as the magnetization direction of the third magnet 3123.

Further, the second magnet 314 includes a fourth magnet 3141 and a fifth magnet 3142 having the same magnetizing direction and being parallel to the first direction, the fourth magnet 3141 and the fifth magnet 3142 are respectively located at two sides of the second voice coil 23 along the second direction, and the magnetizing direction of the first magnet 3121 is opposite to that of the fourth magnet 3141.

The side magnetic circuit 32 includes a side magnet 322 and a side magnetic plate 321 above the side magnet 322, the side magnetic plate 321 and the second magnetic plate 313 are spaced apart to form a first magnetic gap, the first voice coil 14 is at least partially inserted into the first magnetic gap, and the magnetizing direction of the side magnet 322 is parallel and opposite to the magnetizing direction of the fourth magnet 3141. The magnetic circuit system 30 further includes a magnetic yoke 33, and the central magnetic circuit 31 and the side magnetic circuits 32 are fixed on the same side of the magnetic yoke 33 to guide magnetic force lines and avoid magnetic leakage.

Taking the magnetizing direction in fig. 7 as an example, the N poles of the first magnet 3121 and the third magnet 3123 are downward, the N poles of the second magnet 3122, the fourth magnet 3141 and the fifth magnet 3142 are upward, partial magnetic lines of force of the first magnet 3121 and the fourth magnet 3141 pass through the lower driving side of the second voice coil via the left second magnetic conduction plate 313, pass through the right second magnetic conduction plate 313 to the second magnet 3122, pass through the upper driving side of the second voice coil from the second magnet 3122 to the first magnet 3121 (if the first magnetic conduction plate 311 is provided, the magnetic lines of force emitted from the second magnet 3122 pass through the right first magnetic conduction plate 311 and pass through the upper driving side to the first magnet 3121 again via the left first magnetic conduction plate 311), and the upper driving side of the second voice coil 23 is opposite to the current direction of the lower driving side, so that the stress directions of the upper driving side and the lower driving side are the same, the resultant force is maximum, and the driving force is large. Part of magnetic force lines of the fourth magnet 3141 and the first magnet 3121 pass through the first voice coil 14 via the left second magnetic conduction plate 313, then pass through the left magnetic conduction plate 321 to the left magnet 322, and return to the fourth magnet 3141 via the yoke 33, thus forming a magnetic circuit; the magnetic lines of force of the third magnet 3123 and the fifth magnet 3142 pass through the first voice coil 14 via the right second magnetic conductive plate 313, are transferred to the right magnet 322 via the right magnetic conductive plate 321, and return to the fifth magnet 3142 via the yoke 33, thereby forming a magnetic circuit. The magnets are arranged on the upper side and the lower side of the central magnetic circuit part and the second magnetic conduction plate 313, so that more and denser magnetic force lines reach the first voice coil 14 through the second magnetic conduction plate 313, and the driving force is larger, and the magnetic field strength and the driving force can be improved by arranging the side magnetic circuit 32.

Further, as shown in fig. 11, the first magnet 312 further includes a sixth magnet 3124 and a seventh magnet 3125, the sixth magnet 3124 and the seventh magnet 3125 are distributed on two sides of the second voice coil 23 along the third direction, the first magnet 3121, the seventh magnet 3125, the third magnet 3123 and the sixth magnet 3124 are connected end to end, and the second magnet 3122 is added to form a through hole together for inserting the second voice coil 23.

Similarly, as shown in fig. 13, the second magnet 314 further includes an eighth magnet 3143 and a ninth magnet 3144, where the eighth magnet 3143 and the ninth magnet 3144 are distributed on two sides of the second voice coil 23 along the third direction, and the fourth magnet 3141, the ninth magnet 3144, the fifth magnet 3142 and the eighth magnet 3143 are surrounded end to form a through hole, so that the magnetic field strength of the first magnetic gap can be further improved by the eighth magnet 3143 and the ninth magnet 3144. The side magnets 322 have 4 pieces, which are respectively disposed around the second magnet 314, and in other embodiments, the side magnets 322 are in a ring-shaped integrated structure, so that the assembly is convenient.

The first magnet 3121 and the fourth magnet 3141 constitute the first magnetic assembly described above, the second magnet 3122, the third magnet 3123, and the fifth magnet 3142 constitute the second magnetic assembly described above, the sixth magnet 3124 and the eighth magnet 3143 constitute the third magnetic assembly, and the seventh magnet 3125 and the ninth magnet 3144 constitute the fourth magnetic assembly.

The second magnetic conductive plate 313 may be a split structure, and corresponds to the first magnetic component, the second magnetic component, the third magnetic component, and the fourth magnetic component, respectively; as shown in fig. 13 and 14, the second magnetic conductive plate 313 may be integrally formed, which is convenient for assembly.

In one embodiment, as shown in fig. 14, the first magnet 3121, the third magnet 3123, the sixth magnet 3124, and the seventh magnet 3125 of the first magnet 312 are a ring-shaped integrated structure, or the first magnet 312 is an integrated structure as a whole; the second magnet 314 is integrally formed, so that the assembly is convenient and the assembly precision is higher. In another embodiment, the first magnet 3121 and the sixth magnet 3124 of the first magnet 312 are integrally formed, the third magnet 3123 and the seventh magnet 3125 are integrally formed, or the third magnet 3123, the second magnet 3122 and the seventh magnet 3125 are integrally formed; similarly, the fourth magnet 3141 and the eighth magnet 3143 are integrally formed, and the fifth magnet 3142 and the ninth magnet 3144 are integrally formed. In still another embodiment, as shown in fig. 13, the first magnet 3121, the second magnet 3122, the third magnet 3123, the sixth magnet 3124 and the seventh magnet 3125 of the first magnet 312 are separately assembled, or the first magnet 3121, the third magnet 3123, the sixth magnet 3124 and the seventh magnet 3125 are separately assembled, and the second magnet 3122 and the third magnet 3123 are integrally assembled. Namely the split, unitary structural description of the first, second, third and fourth magnetic assemblies described above.

The sounding monomer of the invention also comprises a shell 40, the shell 40 is fixed with the side magnetic conductive plate 321, the outer periphery of the first vibrating diaphragm is fixed on the shell 40, the assembly is convenient, and a vibrating space for downward vibration of the first vibrating diaphragm is provided.

In one embodiment, as shown in fig. 11, the edges of the first magnet 312 are rounded to avoid collision with the first magnet 312 when the first sound generating unit 10 vibrates; in another embodiment, as shown in fig. 12, the corner of the first magnet 312 is cut to form the unfilled corner 3127, which can save cost.

In a specific embodiment, the first diaphragm includes an annular first reinforcing portion 11, an annular first ring 12, and an annular second ring 13, the first voice coil 14 is connected to one side of the first reinforcing portion 11 near the first magnetic gap, the first reinforcing portion 11 is located between the first ring 12 and the second ring 13, the first ring 12 has a first outer fixing portion 122 and a first inner fixing portion 121, the second ring 13 has a second outer fixing portion 132 and a second inner fixing portion 131, an outer periphery of the first reinforcing portion 11 is connected with the first inner fixing portion 121, an inner periphery of the first reinforcing portion 11 is connected with the second outer fixing portion 132, the first outer fixing portion 122 is connected with the housing 40, the second sound generating unit 20 is covered above the second inner fixing portion 131, and the second inner fixing portion 131 is fixedly connected with the central magnetic circuit 31.

As shown in fig. 3 and 4, in some embodiments of the present invention, the sounding unit further includes a centering support 15, one side of the centering support 15 is fixed to the housing 40, and the other side is connected to an end of the first voice coil 14 away from the first diaphragm, so as to prevent the first sounding unit 10 from polarizing during vibration. The number of the centering support pieces 15 may be two, and they may be located at two ends of the sounding unit, or may be an integral structure, or may be four, and they are connected to four corners of the first voice coil 14, which is not limited in the present invention. Further, the centering support 15 is a conductive member, the inner side is provided with a pad connected with a lead (not shown) of the first voice coil 14, the outer side is provided with a pad electrically connected with an external circuit, and the centering support 15 not only realizes polarization prevention but also realizes electrical connection, and has multiple purposes and higher integration.

In one embodiment, the second diaphragm includes a second reinforcing portion 21 and a third gimbal 22, the second voice coil 23 is fixedly connected to a side of the second reinforcing portion 21 near the second magnetic gap, the third gimbal 22 has a third outer fixing portion 222 and a third inner fixing portion 221, the third outer fixing portion 222 is fixed to the fixing ring 25 or the protruding ring 3112, and the third inner fixing portion 221 is fixedly connected to an outer periphery of the second reinforcing portion 21, that is, the second reinforcing portion 21 is connected to an inner periphery of the third gimbal 22.

In another embodiment, as shown in fig. 17 and 18, the second diaphragm is a single planar diaphragm 200 or a second reinforcing portion 21 is provided on the planar diaphragm 200, and the second voice coil 23 is fixedly connected to the single planar diaphragm 200 or the second reinforcing portion 21 on the planar diaphragm 200. The planar diaphragm 200 may be made of PEN, carbon paper, or the like, and the second reinforcing portion 21 may be made of carbon paper, aluminum composite, or the like.

In one embodiment, as shown in fig. 7, an end of the first diaphragm, which is close to the second diaphragm, is fixed between the first magnetic conductive plate 311 and the first magnet 312. More specifically, the first magnetic conductive plate 311 is provided with a recess 3113 at an outer periphery thereof and near one side of the first magnet 312, and the second inner fixing portion 131 of the first diaphragm is located at the recess 3113, i.e., the second inner fixing portion 131 is located between the first magnetic conductive plate 311 and the first magnet 312, and the second inner fixing portion 131 is adhered to the first magnetic conductive plate 311 and/or the first magnet 312. The recess 3113 may be formed by pressing the outer periphery of the first magnetically permeable plate 311, or may be formed by removing material. Since the fixing ring 25 or the protruding ring 3112 is located above the outer periphery of the first magnetic conductive plate 311, the third outer fixing portion 222 of the second diaphragm is adhered to the fixing ring 25 or the protruding ring 3112, and there is an overlap between the adhesion surface of the third outer fixing portion 222 and the adhesion surface of the second inner fixing portion 131 projected in the first direction. The edges of the first vibrating diaphragm and the second vibrating diaphragm are ensured to have wider bonding widths, so that high-level waterproof can be realized under the condition that the vibration radiation area is not lost, for example, the waterproof requirement of 100 meters or more can be met. And under the condition that the vibration radiation areas are the same, smaller product volume can be obtained, and miniaturization is facilitated.

As shown in fig. 9, 10, 12, 15, 16 and 19, the sounding body of the present invention has an injection molding portion 24 extending in a first direction, one end of the injection molding portion 24 is fixed to a first magnetic conductive plate 311, a central magnetic circuit 31 has a relief portion 315 for accommodating the injection molding portion 24, a yoke 33 has a limiting hole 331, and the other end of the injection molding portion 24 is fixed to the limiting hole 331. The electric connector 241 is embedded in the injection molding part 24, two ends of the electric connector 241 are provided with welding parts 2411, the first magnetic conduction plate 311 is provided with an opening 3111 and an avoiding part 316, the welding parts 2411 close to the second diaphragm are exposed, the welding parts 2411 close to the second diaphragm are connected with the lead 231 of the second voice coil 23, the avoiding part 316 is used for avoiding the lead 231 of the second voice coil 23, and the lead 231 is prevented from touching the first magnetic conduction plate 311; the first magnet 312 also has an avoiding portion 316 to prevent the lead wire 231 of the second voice coil 23 from touching the first magnet 312 when the second sound generating unit 20 vibrates downward. The soldering portion 2411 of the end of the electrical connector 241 remote from the second diaphragm is exposed through the limiting hole 331 and is connected to the soldering member 51 on the circuit board 50.

Further, the first magnetic conductive plate 311 has two openings 3111, two avoidance portions 316 and a gap, the two openings 3111 are respectively located at two ends of the gap and at two sides of the gap, and the two openings 3111 are centrally symmetrical; two avoidance portions 316 are located at two ends of the gap and at two sides of the gap, and adjacent avoidance portions 316 and openings 3111 are located at two sides of the gap. The two injection molding portions 24 are respectively corresponding to the two openings 3111, the two injection molding portions 24 are centrosymmetric with respect to the second voice coil 23, the two injection molding portions 24 are respectively located at two sides of the second voice coil 23, and the two leads 231 of the second voice coil 23 are respectively connected to the welding portions 2411 of the two electrical connectors 241 near the second diaphragm.

Further, the first magnet 312, the second magnetic conductive plate 313 and the second magnet 314 have two avoidance portions 315 and a gap, the two avoidance portions 315 are respectively located at two ends of the gap and at two sides of the gap, and the two avoidance portions 315 are centrosymmetric.

When the first magnet 312 is of a split structure, the first magnet 3121 has a relief portion 315 at one end portion thereof and a relief portion 316 at the other end portion thereof, and the third magnet 3123 has a relief portion 315 at one end portion thereof and a relief portion 316 at the other end portion thereof; when the second magnet 314 is of a split structure, the end portion inside the fourth magnet 3141 has the relief portion 315, the end portion inside the fifth magnet 3142 has the relief portion 315, and the relief portion 315 of the fourth magnet 3141 is centrosymmetric with the relief portion 315 of the fifth magnet 3142 with respect to the second voice coil 23.

In the above, the two injection molding portions 24 are centrosymmetric with respect to the second voice coil 23, the central magnetic circuit 31 has the avoiding portion 315, and the injection molding portions 24 are embedded in the avoiding portion 315, so as to ensure that the two injection molding portions are not interfered with the second voice coil 23, prevent the second voice coil 23 from touching the injection molding portions 24, and ensure that the two sides of the second voice coil 23 have sufficient second magnetic gaps. Through the structural design of the injection molding part 24, the electric connection of the lead wire 231 of the second voice coil 23 is facilitated, and meanwhile, the external bonding pad of the conductive piece and the external bonding pad of the circuit board 50 are led out from the same side.

In one embodiment, as shown in fig. 16, a groove 332 is disposed on a side of the yoke 33 away from the central magnetic circuit 31, the circuit board 50 includes a body portion and a welding member 51 disposed on the body portion and electrically connected with the electrical connection member, at least a portion of the body portion is received in the groove 332, two limiting holes 331 are disposed in the groove 332, the two injection molding portions 24 are located at ends of the two injection molding portions 24 away from the second diaphragm through the two limiting holes 331, and a welding portion 2411 of an end of the electrical connection member 241 in the two injection molding portions 24 away from the second diaphragm is exposed through the limiting holes 331, two welding members 51 are disposed on the circuit board 50, and the two welding members 51 are located at two sides of the circuit board 50 and are connected with the welding portion 2411. The thickness of the circuit board 50 is less than or equal to the depth of the groove 332, so that the circuit board 50 is protected, and the circuit board 50 is prevented from being knocked or worn by external devices.

In addition, as shown in fig. 19, the sound generating module includes a housing 60 and the sound generating units in the housing 60, wherein the first sound generating unit 10 and the second sound generating unit 20 of the sound generating units are located on the same side of the magnetic circuit system 30, and the sound generated by the first sound generating unit 10 and the sound generated by the second sound generating unit 20 are converged and transmitted through the sound outlet of the sound generating module.

The invention also discloses electronic equipment which comprises the sounding module or the sounding monomer, and the electronic equipment can be a smart phone, a tablet personal computer, a PC, a wearable device, a head-mounted device and the like.

While certain specific embodiments of the invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the 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 (14)

1. The sound production unit is characterized by comprising a first sound production unit, a second sound production unit, a magnetic circuit system and an injection molding part, wherein the first sound production unit comprises an annular first vibrating diaphragm and a first voice coil connected with the first vibrating diaphragm, the second sound production unit comprises a second vibrating diaphragm and a second voice coil connected with the second vibrating diaphragm, the second vibrating diaphragm is positioned at the inner periphery of the first vibrating diaphragm, and the first voice coil and the second voice coil vibrate along a first direction;

The magnetic circuit system comprises a central magnetic circuit and a side magnetic circuit which is positioned at the periphery of the central magnetic circuit, wherein the central magnetic circuit and the side magnetic circuit are arranged at intervals, a first magnetic gap is formed between the central magnetic circuit and the side magnetic circuit, one side of the first voice coil, which is away from the first vibrating diaphragm, is inserted into the first magnetic gap, and the central magnetic circuit is provided with an avoidance part which is communicated with the inner space and the outer space of the sounding monomer;

The inside of the central magnetic circuit is provided with a second magnetic gap, the second voice coil is a flat voice coil, the axis of the second voice coil extends along a second direction perpendicular to the first direction, and one side of the second voice coil, which is away from the second vibrating diaphragm, is inserted into the second magnetic gap;

At least part the injection molding part is arranged in the avoidance part, an electric connecting piece is embedded in the injection molding part, and two ends of the electric connecting piece are respectively electrically connected with the second voice coil and an external circuit.

2. The sound emitting unit of claim 1, wherein the relief portion and the injection molded portion each extend in the first direction.

3. The sound generating unit according to claim 1, wherein the number of the injection molding parts is two, the two injection molding parts are positioned at two ends of the second voice coil along a third direction perpendicular to the first direction and the second direction respectively, and the two injection molding parts are positioned at two opposite sides of the second voice coil along the second direction respectively.

4. The sound generating unit according to claim 1, wherein the central magnetic circuit includes a first magnetic conductive plate, a first magnet, a second magnetic conductive plate, and a second magnet stacked in this order along the first direction, and the second diaphragm is disposed opposite to the first magnetic conductive plate.

5. The sound producing unit as claimed in claim 4, wherein the injection molding part is fixedly connected with the first magnetic conductive plate.

6. The sound generating unit according to claim 4, further comprising a fixing ring, wherein the fixing ring is arranged on one side of the first magnetic conduction plate, which is away from the first magnet, and the periphery edge of the second vibrating diaphragm is fixed on one side of the fixing ring, which is away from the first magnetic conduction plate;

and/or one end of the first vibrating diaphragm, which is close to the second vibrating diaphragm, is fixed between the first magnetic conduction plate and the first magnet.

7. The sound generating unit according to claim 1, wherein the central magnetic circuit includes a first magnet, a second magnetic conductive plate, and a second magnet stacked in this order along the first direction, and the second diaphragm is disposed opposite to the first magnet.

8. The sound generating unit of claim 7, further comprising a fixing ring, wherein the fixing ring is arranged on one side of the first magnet, which is away from the second magnetic conductive plate, the second vibrating diaphragm is fixed on one side of the fixing ring, which is away from the first magnet, and the injection molding part is fixedly connected with the fixing ring.

9. The sound producing monomer of claim 8, wherein an end of the first diaphragm adjacent to the second diaphragm is fixed between the retaining ring and the first magnet.

10. The sound generating unit according to claim 5, wherein the first magnetic conductive plate comprises two openings, two openings correspond to the two injection molding parts, and one end of the electric connecting piece, which is close to the second vibrating diaphragm, is exposed to the openings.

11. The sounding monomer according to claim 1, wherein the magnetic circuit system further comprises a magnetic yoke, the central magnetic circuit and the side magnetic circuits are all fixed on the same side of the magnetic yoke, a limiting hole is formed in the magnetic yoke, one end of the injection molding part, which is far away from the second vibrating diaphragm, is fixed with the limiting hole, and one end of the electric connecting piece, which is far away from the second vibrating diaphragm, is exposed to the limiting hole.

12. The sound producing unit as claimed in claim 11, further comprising a circuit board, wherein the circuit board comprises a body portion and a welding member disposed on the body portion and electrically connected to the electrical connector, a groove is disposed on a side of the yoke facing away from the central magnetic circuit, and at least a part of the body portion is accommodated in the groove.

13. A sound module comprising a housing and a sound monomer according to any one of claims 1-12 located within the housing.

14. An electronic product, characterized in that the electronic product comprises the sounding module according to claim 13;

or, the electronic product comprises the sounding monomer as defined in any one of claims 1 to 12.