CN111954125A

CN111954125A - Dome and speaker

Info

Publication number: CN111954125A
Application number: CN202010608350.1A
Authority: CN
Inventors: 马利鹏
Original assignee: Science and Education City Branch of AAC New Energy Development Changzhou Co Ltd
Current assignee: Science and Education City Branch of AAC New Energy Development Changzhou Co Ltd
Priority date: 2020-06-29
Filing date: 2020-06-29
Publication date: 2020-11-17
Also published as: WO2022000611A1

Abstract

The invention relates to the technical field of electroacoustic devices, in particular to a dome and a loudspeaker. This dome includes: including first heat dissipation layer and the substrate layer of range upon range of setting, the substrate layer includes the expanded material layer of making by expanded material and the heat conduction material of dispersion in the expanded material layer, and the heat conductivity of heat conduction material is greater than expanded material's heat conductivity. According to the dome and the loudspeaker, the heat conduction materials are arranged in the base material layer, so that heat generated by the voice coil can be timely conducted to the front cavity by virtue of the heat conduction particles in the heat conduction materials, and the heat is dissipated from the front cavity, the heat dissipation efficiency is improved, the influence on the acoustic performance of the loudspeaker due to the fact that a composite layer of the dome structure is deformed by heat is avoided, and the stability of the loudspeaker is improved.

Description

Dome and speaker

[ technical field ] A method for producing a semiconductor device

The invention relates to the technical field of electroacoustic devices, in particular to a dome and a loudspeaker.

[ background of the invention ]

The dome-shaped loudspeaker is a loudspeaker which directly radiates sound waves by utilizing a dome-shaped vibrating diaphragm, belongs to an electrodynamic loudspeaker, and is a hemispherical diaphragm which directly supports a voice coil without a centering support piece by using a vibrating diaphragm corrugated ring.

The dome among the prior art generally includes the PMI layer, because the PMI layer is closed cell foam, the heat dissipation of dome can only be conducted to back chamber magnetic circuit and distribute away from among the magnetic circuit through the air, and the radiating effect is not good, leads to the dome structure to warp owing to being heated easily to influence the acoustic performance of speaker vibrating diaphragm.

Therefore, there is a need to provide a new technical solution to solve the above technical problems.

[ summary of the invention ]

The invention provides a carbon fiber dome and a loudspeaker, which can solve the problem of low heat dissipation efficiency of the dome in the prior art.

The technical scheme of the invention is as follows: the utility model provides a dome, including the first heat dissipation layer and the substrate layer of range upon range of setting, the substrate layer includes the expanded material layer of being made by expanded material and disperse in the heat conduction material in the expanded material layer, the heat conductivity of heat conduction material is greater than the heat conductivity of expanded material.

Preferably, the thermally conductive material comprises one or more of graphene, carbon powder, graphite, and metal particles.

Preferably, the particle size of the heat conduction material is 5-20 μm.

Preferably, the mass fraction of the heat conducting material in the foaming material layer is 10% -30%.

Preferably, the foaming material comprises one or more of polyethylene terephthalate, polymethacrylimide, polyimide, polypropylene and polyphenylene sulfide.

Preferably, the dome further comprises a second heat dissipation layer stacked on the surface of the substrate layer on the side far away from the first heat dissipation layer.

Preferably, the first heat dissipation layer and the second heat dissipation layer are respectively one of an aluminum foil layer, an aluminum alloy layer and a carbon fiber layer.

Preferably, the thickness of the substrate layer is 0.05 mm-0.5 mm.

Preferably, the thickness of the ball top is 0.06-0.53 mm.

The other technical scheme of the invention is as follows: a loudspeaker is provided, which comprises the dome.

The invention has the beneficial effects that: through set up the heat conduction material in the substrate layer, the heat that can make the voice coil loudspeaker voice coil produce relies on the heat conduction particle in the heat conduction material in time to conduct the antechamber to distribute away the heat from the antechamber, improved the radiating efficiency, avoided the composite bed of ball top structure because the acoustic performance that receives the thermal deformation and influence the speaker, improved the stability of speaker.

[ description of the drawings ]

Fig. 1 is a schematic perspective view of a speaker according to an embodiment of the present invention;

fig. 2 is an exploded view of a speaker according to an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of the loudspeaker of FIG. 1 taken along line A-A;

FIG. 4 is a schematic structural diagram of a dome according to a first embodiment of the present invention;

fig. 5 is a schematic structural diagram of a dome according to a second embodiment of the present invention.

[ detailed description ] embodiments

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terms "first", "second" and "third" in the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. All directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are only used to explain the relative positional relationship between the components, the movement, and the like in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

Fig. 1 is a schematic perspective view of a speaker according to an embodiment of the present invention, fig. 2 is a schematic exploded view of the speaker according to the embodiment of the present invention, fig. 3 is a schematic sectional view of the speaker of fig. 1 along a-a line, and as shown in fig. 1 to 3, the speaker 100 includes a frame 10 having a receiving space 11, a magnetic circuit system 20 fixed in the frame 10, and a vibration system 30. The magnetic circuit system 20 includes a magnetic bowl 21, a magnetic steel 22 disposed on the magnetic bowl 21, and a pole core 23 attached to the surface of the magnetic steel 22. A magnetic gap 24 is formed between the magnetic bowl 21 and the magnetic steel 22. The vibration system 30 includes a fixing frame 31 fixed on the frame 10, a diaphragm 32 fixed between the fixing frame 31 and the frame 10, a voice coil 33 disposed in the magnetic gap 24 and driving the diaphragm 32 to vibrate, and a ball top 34 disposed on the surface of the diaphragm 32. One end of the voice coil 33 is fixedly connected with one side surface of the diaphragm 32, the other end is inserted into the magnetic gap 24, and the diaphragm 32 is clamped between the ball top 34 and the voice coil 33.

Fig. 4 is a schematic structural diagram of a dome according to a first embodiment of the present invention, and as shown in fig. 4, the dome 34 includes a first heat dissipation layer 341 and a substrate layer 342 that are sequentially stacked in a direction from the voice coil 33 to the diaphragm 32, where the substrate layer 342 includes a foam material layer made of a foam material and a heat conduction material dispersed in the foam material layer, and a heat conductivity of the heat conduction material is greater than a heat conductivity of the foam material.

Compared with the conventional structure, in the first embodiment of the present invention, the heat conducting material is disposed in the substrate layer 342, and the heat conductivity of the heat conducting material is greater than that of the foam material, so that the heat generated by the voice coil 33 can be conducted to the front cavity in time by the heat conducting material in the substrate layer 342, and the heat can be dissipated from the front cavity, thereby improving the heat dissipation efficiency, preventing the composite layer of the dome structure from being deformed by heat to affect the acoustic performance of the speaker 100, and improving the stability of the speaker 100.

Fig. 5 is a schematic structural diagram of a dome according to a second embodiment of the present invention, and as shown in fig. 5, the dome 34 includes a first heat dissipation layer 341, a base material layer 342, and a second heat dissipation layer 343, which are sequentially stacked in a direction from the voice coil 33 to the diaphragm 32, where the base material layer 342 includes a foam material layer made of a foam material and a heat conduction material dispersed in the foam material layer, and a heat conductivity of the heat conduction material is greater than a heat conductivity of the foam material.

Compared with the traditional structure, on the basis of the first embodiment, the heat conduction material is arranged in the substrate layer 342, and the heat conductivity of the heat conduction material is larger than that of the foaming material, so that on one hand, heat generated by the voice coil 33 can be timely conducted to the front cavity by virtue of the heat conduction material in the substrate layer 342, the heat can be emitted from the front cavity, the heat dissipation efficiency is improved, the influence on the acoustic performance of the loudspeaker 100 caused by the thermal deformation of a composite layer of the dome structure is avoided, and the stability of the loudspeaker 100 is improved; on the other hand, the rigidity and the strength of the ball top 34 can be obviously improved, so that the performance and the reliability of the product are improved.

In the above embodiments, the thermally conductive material includes one or more of graphene, carbon powder, graphite, and metal particles. The heat conducting material is preferably graphene, because of the advantages of light weight, thin thickness and extremely high heat conductivity.

Further, the foaming material comprises one or more of polyethylene terephthalate, polymethacrylimide, polyimide, polypropylene and polyphenylene sulfide. The foam material is preferably polyethylene terephthalate. Polyethylene terephthalate (PET) is a polycondensation reaction product of ethylene glycol and terephthalic acid, and is a linear macromolecule with high crystallinity and high melting point. As a thermoplastic engineering material, PET has the characteristics of good mechanical property, electrical insulation, chemical resistance, creep resistance, fatigue resistance, friction resistance and the like. The unfoamed PET is a solid material with a density of about 1.4g/cm³Left and right, unfoamed PET and HairThe PMI foam has a density higher than that of the PMI foam, the foam material layer is a polyethylene terephthalate foam (PET foam) produced by foam molding of PET, and a large number of fine pores are contained in the foam material layer, and the average pore diameter of the pores is 20 [ mu ] m or less. The air holes are independent air holes so as not to influence the transmission of sound. In a preferred embodiment, the dome 34 is formed by compounding a PET foam with a heat conductive material, so that the heat conductive performance of the dome 34 of the above embodiment is greatly improved, and meanwhile, due to the waterproof performance of the PET foam, the waterproof grade of the product is improved while the strength of the product is ensured.

Further, the heat conductive material is dispersed in the form of heat conductive particles in the foaming material in the base material layer 342. Since the air holes in the foam material layer are closed holes and cannot conduct heat, the embodiment conducts heat to the front cavity through the heat conducting particles. Furthermore, the particle size of the heat conduction material is 5-20 μm. The mass fraction of the heat conducting material in the foaming material layer is 10-30%. The above-described embodiment can control the heat conduction efficiency of the base material layer 342 by adjusting the particle size of the heat conduction material and the mass fraction of the heat conduction material in the foam material layer.

In the above embodiment, the first heat dissipation layer 341 includes one of an aluminum foil layer, an aluminum alloy layer, and a carbon fiber layer, and the second heat dissipation layer 343 includes one of an aluminum foil layer, an aluminum alloy layer, and a carbon fiber layer. The materials of the first and second

heat dissipation layers

341 and 343 may be the same or different. Preferably, the first and second

heat dissipation layers

341 and 343 are both aluminum alloy layers. The aluminum alloy layer has good thermal conductivity and light weight, and has a certain hardness, in a preferred embodiment, when the first heat dissipation layer 341 and the second heat dissipation layer 343 are both aluminum alloy layers, the dome 34 is compounded with the first heat dissipation layer 341 and the second heat dissipation layer 343 through the base material layer 342, so that the rigidity and the strength are improved while the good thermal conductivity is obtained. In other embodiments, the first heat dissipation layer 341 and/or the second heat dissipation layer 343 are aluminum foil layers, and although the aluminum foil has good thermal conductivity and light weight, the aluminum foil has insufficient hardness, is difficult to process, and is easily deformed when being applied to the dome 34, which affects the performance and reliability of the product. In still other embodiments, the first heat dissipation layer 341 and/or the second heat dissipation layer 343 are carbon fiber layers, each carbon fiber layer includes at least two layers of carbon fiber unidirectional tape prepregs, each carbon fiber unidirectional tape prepreg includes a carbon fiber unidirectional tape and prepreg resin, and carbon fiber materials in the carbon fiber unidirectional tape prepreg extend in a unidirectional manner, and the carbon fiber unidirectional tape prepreg can be obtained by: the carbon fiber unidirectional tape impregnating material is formed by impregnating or spraying thermosetting prepreg resin on a carbon fiber unidirectional tape and then carrying out high-temperature and high-pressure treatment on the carbon fiber unidirectional tape, wherein the prepreg of the carbon fiber unidirectional tape of the carbon fiber layer can bear large stress in the fiber extending direction, namely the fiber direction, and can bear weak stress in the direction vertical to the fiber direction, but the capacity of bearing the stress is greatly enhanced after the prepreg resin is cured. Carbon fiber materials are lighter than aluminum alloys, but are less thermally conductive than aluminum alloys and are more costly.

In one embodiment, the dome 34 has a thickness of 0.06 to 0.53 mm; further, the thickness of the base material layer 342 is 0.05mm to 0.5 mm.

While the foregoing is directed to embodiments of the present invention, it will be understood by those skilled in the art that various changes may be made without departing from the spirit and scope of the invention.

Claims

1. The utility model provides a dome which characterized in that, dome is including the first heat dissipation layer and the substrate layer of range upon range of setting, the substrate layer include the expanded material layer of being made by expanded material and disperse in the heat conduction material in the expanded material layer, the heat conductivity of heat conduction material is greater than expanded material's heat conductivity.

2. The dome of claim 1, wherein the thermally conductive material comprises one or more of graphene, carbon powder, graphite, and metal particles.

3. The dome top according to claim 2, wherein the particle size of the heat conductive material is 5 to 20 μm.

4. The dome according to claim 1, wherein the mass fraction of the heat conductive material in the foam material layer is 10% to 30%.

5. The dome of claim 1, wherein the foam material comprises one or more of polyethylene terephthalate, polymethacrylimide, polyimide, polypropylene, and polyphenylene sulfide.

6. The dome of claim 1, further comprising a second heat dissipation layer stacked on a surface of the substrate layer away from the first heat dissipation layer.

7. The dome top of claim 6, wherein the first heat dissipation layer and the second heat dissipation layer are each one of an aluminum foil layer, an aluminum alloy layer, and a carbon fiber layer.

8. The dome of claim 1, wherein the thickness of the substrate layer is 0.05mm to 0.5 mm.

9. The dome of claim 1, wherein the dome has a thickness of 0.06-0.53 mm.

10. A loudspeaker, characterized in that the loudspeaker comprises a dome according to any one of claims 1 to 9.