CN211656369U

CN211656369U - Audio playing device and electronic equipment

Info

Publication number: CN211656369U
Application number: CN202020517091.7U
Authority: CN
Inventors: 金修禄
Original assignee: Beijing Xiaomi Mobile Software Co Ltd
Current assignee: Beijing Xiaomi Mobile Software Co Ltd
Priority date: 2020-04-09
Filing date: 2020-04-09
Publication date: 2020-10-09
Anticipated expiration: 2030-04-09

Abstract

The present disclosure relates to an audio playing device and an electronic apparatus, the audio playing device includes: permanent-magnet component, voice coil loudspeaker voice coil, vibrating diaphragm and magnetic fluid. The permanent magnetic piece of the audio playing device is provided with the containing part, the containing part is filled with the magnetic liquid, at least one part of the heat conduction matching part of the voice coil is immersed into the magnetic liquid, so that heat generated by the voice coil can be rapidly diffused to the magnetic liquid and is dissipated through the permanent magnetic piece, and therefore the heat dissipation effect of the audio playing device and the electronic equipment using the audio playing device is improved.

Description

Audio playing device and electronic equipment

Technical Field

The present disclosure relates to the field of electronic technologies, and in particular, to an audio playing apparatus and an electronic device.

Background

In the related art, an electronic device such as a mobile phone generally includes an audio playing device for implementing an audio playing function of the electronic device such as the mobile phone. The power increase of the audio playing device may cause heat accumulation of structures such as a voice coil in the audio playing device, which may cause problems such as burning and loosing loops, and further damage the audio playing device of the electronic device.

SUMMERY OF THE UTILITY MODEL

The present disclosure provides an audio playing device and an electronic apparatus, so as to improve a heat dissipation effect of the audio playing device.

According to a first aspect of the present disclosure, an audio playing device is provided, the audio playing device comprising: the voice coil is arranged on the magnetic liquid;

the permanent magnetic piece is provided with at least one accommodating part, and the magnetic liquid is accommodated in the accommodating part;

the voice coil comprises a diaphragm connecting part and a heat conduction matching part; the vibrating diaphragm connecting part is connected with the vibrating diaphragm; the heat conduction matching part is contained in the containing part, and at least one part of the heat conduction matching part is immersed in the magnetic liquid.

Optionally, a plurality of accommodating portions are arranged on the permanent magnet, and the voice coil includes a plurality of heat-conducting matching portions; each accommodating part is used for accommodating the magnetic liquid, and each heat conduction matching part is accommodated in one accommodating part.

Optionally, an arc-shaped flow guide surface is arranged at the opening of the accommodating part.

Optionally, the permanent magnet piece includes magnetic steel.

Optionally, the volume height of the magnetic liquid is less than half of the depth of the accommodating part.

Optionally, the audio playing device further includes a circuit board, where the circuit board is provided with a voice coil control circuit, and the voice coil is electrically connected to the voice coil control circuit; the permanent magnetic part is in heat conduction fit with the circuit board.

Optionally, the circuit board includes a substrate and a copper exposed structure disposed on the substrate, and the permanent magnet is in contact fit with the copper exposed structure.

Optionally, the audio playing device further includes a heat conducting member, and the heat conducting member is respectively fitted to the permanent magnet member and the circuit board.

Optionally, the heat conducting member includes at least one of a graphite sheet and a copper foil.

According to a second aspect of the present disclosure, an electronic device is provided, which includes a device main body and the audio playing apparatus, wherein the audio playing apparatus is assembled to the device main body.

The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:

the accommodating part is arranged on the permanent magnetic part of the audio playing device, the accommodating part is filled with the magnetic liquid, and at least one part of the heat conduction matching part of the voice coil is immersed in the magnetic liquid, so that heat generated by the voice coil can be rapidly diffused to the magnetic liquid and is dissipated through the permanent magnetic part, and therefore the heat dissipation effects of the audio playing device and the electronic equipment using the audio playing device are improved.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

Fig. 1 is a schematic cross-sectional structure diagram of an audio playing apparatus in an exemplary embodiment of the present disclosure;

fig. 2 is a schematic cross-sectional structure diagram of an audio playing apparatus at another angle in an exemplary embodiment of the disclosure;

fig. 3 is a schematic cross-sectional structure diagram of an audio playing device in another exemplary embodiment of the present disclosure;

fig. 4 is a schematic cross-sectional structure diagram of an audio playing device in yet another exemplary embodiment of the present disclosure.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

The audio playback device that this disclosure provided includes: permanent-magnet component, voice coil loudspeaker voice coil, vibrating diaphragm and magnetic fluid. The permanent magnetic piece is provided with at least one containing part, and the magnetic liquid is contained in the containing part. The voice coil loudspeaker voice coil includes vibrating diaphragm connecting portion and heat conduction cooperation portion, vibrating diaphragm connecting portion with the vibrating diaphragm links to each other, and heat conduction cooperation portion is acceptd in the portion of holding, and at least a part of heat conduction cooperation portion immerses in the magnetic fluid.

The accommodating part is arranged on the permanent magnetic part of the audio playing device, the accommodating part is filled with the magnetic liquid, at least one part of the heat conduction matching part of the voice coil is immersed into the magnetic liquid, so that the heat generated by the voice coil can be quickly diffused to the magnetic liquid and is dissipated through the permanent magnetic part, the problem that the heat is accumulated on the voice coil to cause ring burning and ring scattering is avoided, and the heat dissipation effect of the audio playing device is improved.

Fig. 1 is a schematic cross-sectional structure diagram of an audio playing apparatus in an exemplary embodiment of the present disclosure. As shown in fig. 1, the audio playback apparatus 1 includes: permanent magnet 11, voice coil 12, diaphragm 13 and magnetic liquid 14. The permanent magnet 11 is provided with at least one accommodating portion 111, and the magnetic liquid 14 is accommodated in the accommodating portion 111. The voice coil 12 includes a diaphragm connecting portion 121 and a heat conduction matching portion 122, the diaphragm connecting portion 121 is connected to the diaphragm 13, the heat conduction matching portion 122 is accommodated in the accommodating portion 111, and at least a part of the heat conduction matching portion 122 is immersed in the magnetic liquid 14.

The accommodating portion 111 may be a magnetic gap provided in the permanent magnet 11, and when the heat-conducting engagement portion 122 of the voice coil 12 is accommodated in the magnetic gap and current is passed through the magnetic gap, a magnetic field formed by the voice coil 12 may interact with a magnetic field of the permanent magnet 11, so that the voice coil 12 may generate regular vibration. The permanent magnet 11 may be a magnetic steel, which is generally an alnico alloy, and is synthesized from several hard strong metals, such as fe, al, ni, and co, or cu, nb, and ta, and is used to manufacture an ultra-hard permanent magnet alloy.

The magnetic liquid 14 is also called magnetic liquid and ferrofluid, has the liquidity of liquid and the magnetism of a solid magnetic material, is stable colloidal liquid formed by mixing magnetic solid particles with the diameter of nanometer magnitude (below 10 nanometers), base carrier liquid and a surfactant, and has better electromagnetic property and heat conduction property. The magnetic liquid 14 has no magnetic attraction in a static state, and shows magnetism when an external magnetic field is applied. In the present disclosure, the carrier of magnetic liquid 14 may be a synthetic hydrocarbon, the saturation magnetization range of magnetic liquid 14 may be 110G-220G, and the viscosity range of magnetic liquid 14 may be 100cP-10000cP or 200cP-6000 cP. For example, the magnetic liquid 14 may be selected from Ferrotec APG1100, Ferrotec APG2100, and the like.

In the above embodiment, the accommodating portion 111 is disposed on the permanent magnet 11 of the audio playing device 1, the accommodating portion 111 accommodates the magnetic liquid 14, and at least a part of the heat conduction matching portion 122 of the voice coil 12 is immersed in the magnetic liquid 14, so that heat generated by the voice coil 12 can be quickly diffused to the magnetic liquid 14 by utilizing the heat conduction performance of the magnetic liquid 14 superior to media such as air, and is dissipated through the permanent magnet 11, thereby improving the heat dissipation efficiency of the audio playing device 1, and facilitating the improvement of the working power of the audio playing device 1 on the premise of increasing the heat dissipation efficiency. The magnetic liquid 14 can be absorbed in the containing part 111 of the permanent magnetic member 11 due to its own electromagnetic performance, so as to avoid leakage caused by shaking of the audio playing device 1, and ensure the heat dissipation reliability of the audio playing device 1 in a dynamic use scene. In addition, according to the audio playing device 1, the magnetic liquid 14 is added in the accommodating part 111 of the original permanent magnetic part 11, so that a heat dissipation structure is prevented from being additionally arranged in the audio playing device 1, a heat dissipation path and a heat dissipation structure are simplified, and the audio playing device 1 is facilitated to be miniaturized.

When the audio playing device 1 works, a magnetic field formed after current is introduced into the voice coil 12 can interact with a magnetic field of the permanent magnetic part 11, so that the voice coil 12 generates regular vibration, and the vibrating diaphragm connecting part 121 of the voice coil 12 is connected with the vibrating diaphragm 13, so that the vibrating diaphragm 13 can generate sound along with the vibration of the voice coil 12. Voice coil 12 keeps during the vibration that at least a part of heat conduction cooperation portion 122 immerses in magnetic fluid 14 for possess the heat that voice coil 12 can be taken away to magnetic fluid 14 of good heat conductivility, and dispel the heat through permanent-magnet component 11, promoted the radiating effect to audio playback device 1. Wherein, the diaphragm connecting portion 121 may be bonded and matched with the diaphragm 13 to realize the fixation between the voice coil 12 and the diaphragm 13.

After the audio playing device 1 stops working, at least a portion of the heat-conducting matching portion 122 of the voice coil 12 is immersed in the magnetic liquid 14, and can continuously absorb and dissipate the residual heat on the voice coil 12, so as to avoid the problem of burning and dissipating the heat due to the accumulation of the heat on the voice coil 12, facilitate the performance maintenance of the voice coil 12, and improve the use performance and the service life of the audio playing device 1.

In some embodiments, the volume height of the magnetic liquid 14 is less than half the depth of the receptacle 111. The volume height of the magnetic fluid 14 may refer to a height of a highest liquid level of the magnetic fluid 14 relative to a bottom surface of the accommodating portion 111 when the magnetic fluid 14 is in the accommodating portion 111, and since the magnetic fluid 14 is in a liquid state and at least a part of the structure of the heat conduction matching portion 122 of the voice coil 12 is immersed in the magnetic fluid 14, the height of the highest liquid level of the magnetic fluid 14 after the heat conduction matching portion 122 is immersed may rise and may also splash during shaking or vertical vibration of the voice coil 12 and remain at other positions inside the diaphragm 13 or the audio playing device 1, and limiting the volume height of the magnetic fluid 14 may prevent the magnetic fluid 14 from overflowing after the heat conduction matching portion 122 is immersed, reduce a possibility that the magnetic fluid 14 splashes along with the vertical vibration of the voice coil 12, maintain a preset heat dissipation effect of the magnetic fluid 14, and avoid interference on a playing function of the. Or, on the premise of ensuring the immersion depth requirement of the heat-conducting matching part 122, the volume height of the magnetic liquid 14 may also be less than one third, and two thirds of the depth of the accommodating part 111, and may be set according to the specific heat dissipation requirement.

At least a part of the thermal conductive matching part 122 of the voice coil 12 is immersed in the magnetic liquid 14, wherein the thermal conductive matching part 122 may be a section of coil at one end of the voice coil 12, and the length of the thermal conductive matching part 122 may be set according to parameters such as viscosity and volume height of the magnetic liquid 14, so as to ensure that resistance force applied when at least a part of the thermal conductive matching part 122 vibrates in the magnetic liquid 14 does not affect the sound generating function of the diaphragm 13. For example, the length of the thermal conductive fitting 122 may be one of one third, one fourth, and two fifths of the total length of the coil of the voice coil 12.

In some embodiments, an arc-shaped guiding surface 1111 is disposed at the opening of the accommodating portion 111, and since the magnetic fluid 14 is in a liquid state, the magnetic fluid may splash and remain at other positions inside the diaphragm 13 or the audio playing device 1 during shaking or vertical vibration of the voice coil 12, when the arc-shaped guiding surface 1111 is disposed at the opening of the accommodating portion 111, the magnetic fluid 14 can not only return to the accommodating portion 111 by its own weight and the attraction force between the magnetic fluid 14 and the permanent magnet 11, but also slide into the accommodating portion 111 by the structure of the arc-shaped guiding surface 1111, thereby ensuring the amount of the magnetic fluid 14 in the accommodating portion 111 and the heat dissipation effect.

In some embodiments, as shown in fig. 2, the permanent magnet 11 is provided with a receiving portion 111, and the receiving portion 111 is one of a ring-shaped groove, a strip-shaped groove, an arc-shaped groove, and a circular groove provided on the permanent magnet 11. The annular groove can be a circular annular groove, a polygonal annular groove or an annular groove with an irregular cross section shape; the cross section of the strip-shaped groove can be rectangular, polygonal or other irregular shapes, the cross section of the circular groove is circular, and the cross section of the arc-shaped groove comprises arc-shaped edges. The annular groove, the strip-shaped groove, the arc-shaped groove and the circular groove are simple in structure and convenient to process. Voice coil 12 may include one or more thermally conductive fittings 122, with thermally conductive fittings 122 received in the annular grooves, and at least a portion of thermally conductive fittings 122 immersed in magnetic fluid 14.

In other embodiments, a plurality of accommodating portions 111 are provided on the permanent magnet 11, the voice coil 12 includes a plurality of heat-conducting matching portions 122, each accommodating portion 111 holds the magnetic fluid 14, and each heat-conducting matching portion 122 is accommodated in one accommodating portion 111. The accommodating portions 111 are arranged at intervals, so that mutual interference of the heat conduction matching portions 122 when the heat conduction matching portions vibrate along with the voice coil 12 is reduced, and excessive splashing caused by the mutual interference of the heat conduction matching portions 122 is avoided.

The plurality of accommodating portions 111 may be one or more of annular grooves, strip-shaped grooves, arc-shaped grooves, and circular grooves provided on the permanent magnet 11. The annular groove can be a circular annular groove, a polygonal annular groove or an annular groove with an irregular cross section shape, and the like, the cross section of the strip-shaped groove can be a rectangle, a polygon or other irregular shapes, and the cross section of the circular groove is circular, and the cross section of the arc-shaped groove comprises an arc-shaped edge.

In some embodiments, as shown in fig. 3, the audio playing apparatus 1 further includes a circuit board 15, a voice coil control circuit (not labeled) is disposed on the circuit board 15, the voice coil 12 is electrically connected to the voice coil control circuit, and the permanent magnet 11 is in heat-conducting fit with the circuit board 15. The diaphragm connecting portion 121 of the voice coil 12 is connected to the diaphragm 13 by vibration of the voice coil 12 by a voice coil control circuit on the circuit board 15, so that the diaphragm 13 can generate sound in accordance with the vibration of the voice coil 12. The permanent magnet 11 and the circuit board 15 are in heat conduction fit, so that heat absorbed by the magnetic fluid 14 from the voice coil 12 is dissipated through the permanent magnet 11 and the circuit board 15. Because vibrating diaphragm 13, permanent magnetic component 11 and shell isotructure enclose into a whole, voice coil 12 is located above-mentioned whole inside, and above-mentioned whole setting is in circuit board 15 top, and circuit board 15 is located above-mentioned whole outside, and above-mentioned structure setting has formed the heat conduction route from inside to outside with the help of circuit board 15's structure, has promoted audio playback device 1's radiating effect.

In the above embodiment, the circuit board 15 includes the substrate 151 and the copper exposed structure 152 disposed on the substrate 151, and the copper exposed structure 152 has a better heat dissipation performance. The permanent magnet 11 may be directly contacted and matched with the exposed copper structure 152, so as to conduct and dissipate heat on the permanent magnet 11 through the exposed copper structure 152, thereby enhancing the heat dissipation effect of the heat conduction path.

In other embodiments, as shown in fig. 4, the audio playing apparatus 1 includes a circuit board 15 and a heat conducting member 16, wherein the circuit board 15 is provided with a voice coil control circuit, and the voice coil 12 is electrically connected to the voice coil control circuit. The heat conducting members 16 are respectively fitted to the permanent magnet member 11 and the circuit board 15 to form a heat conducting fit of the permanent magnet member 11 and the circuit board 15. The heat conduction effect between the permanent magnet 11 and the circuit board 15 is enhanced by the heat conduction member 16, so that the heat conduction efficiency from the permanent magnet 11 to the circuit board 15 and the overall heat dissipation effect of the audio playing device 1 are improved.

In the above embodiment, the circuit board 15 includes the substrate 151 and the copper exposed structure 152 disposed on the substrate 151, and the copper exposed structure 152 has a better heat dissipation performance. The heat conducting member 16 can be in contact with the exposed copper structure 152 to conduct and dissipate heat on the permanent magnet 11 through the exposed copper structure 152, so as to enhance the heat dissipation effect of the heat conducting path. Alternatively, the heat-conducting member 16 may be directly engaged with the substrate 151 of the circuit board 15 to dissipate heat through the substrate 151.

The heat conductive member 16 is at least one of a graphite sheet and a copper foil. When the heat conducting member 16 is a graphite sheet, it has the properties of environmental protection, light weight and good heat conducting effect. The audio playback device 1 is a device for realizing sound playback, and may be a speaker.

The present disclosure further proposes an electronic device, which includes a device main body and an audio playback apparatus 1, wherein the audio playback apparatus 1 is assembled to the device main body.

In the above embodiment, the accommodating portion 111 is disposed on the permanent magnetic member 11 of the audio playing device 1, the accommodating portion 111 accommodates the magnetic liquid 14, and at least a portion of the heat conduction matching portion 122 of the voice coil 12 is immersed in the magnetic liquid 14, so that heat generated by the voice coil 12 can be quickly diffused to the magnetic liquid 14 and dissipated through the permanent magnetic member 11, thereby improving heat dissipation effects of the audio playing device 1 and the electronic device using the audio playing device 1, and facilitating improvement of working power of the audio playing device 1 on the premise of increasing heat dissipation efficiency.

It should be noted that, the electronic device may be a mobile phone, a tablet computer, a vehicle-mounted terminal, a sound box, an earphone, or a medical terminal, and the disclosure does not limit this. Taking an electronic device as an example of a mobile phone, the magnetic liquid 14 can be adsorbed in the accommodating portion 111 of the permanent magnetic member 11 due to its own electromagnetic performance, so as to avoid leakage caused by shaking of the audio playing device 1, and ensure the heat dissipation reliability of the audio playing device 1 in a dynamic usage scenario of the mobile phone. In addition, according to the present disclosure, the magnetic liquid 14 is added in the accommodating portion 111 of the original permanent magnetic member 11 of the audio playing device 1, so as to avoid an additional heat dissipation structure in the audio playing device 1, simplify a heat dissipation path and a heat dissipation structure, and facilitate the miniaturization of the audio playing device 1 and the lightness and thinness of electronic devices such as mobile phones.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. An audio playback apparatus, comprising: the voice coil is arranged on the magnetic liquid;

2. The audio playback device as claimed in claim 1, wherein the permanent magnet member has a plurality of receiving portions, and the voice coil includes a plurality of heat-conductive engaging portions; each accommodating part is used for accommodating the magnetic liquid, and each heat conduction matching part is accommodated in one accommodating part.

3. The audio playback device as claimed in claim 1, wherein an opening of the receiving portion is provided with an arc-shaped flow guide surface.

4. The audio playback device of claim 1, wherein the permanent magnet comprises magnetic steel.

5. The audio playback device of claim 1, wherein a volume height of the magnetic fluid is less than half of a depth of the receptacle.

6. The audio playing device according to claim 1, further comprising a circuit board, wherein a voice coil control circuit is disposed on the circuit board, and the voice coil is electrically connected to the voice coil control circuit; the permanent magnetic part is in heat conduction fit with the circuit board.

7. The audio playing device as claimed in claim 6, wherein the circuit board includes a substrate and a copper exposed structure disposed on the substrate, and the permanent magnet is in contact with and engaged with the copper exposed structure.

8. The audio playback device of claim 6, further comprising a thermal conductor member coupled to the permanent magnet member and the circuit board, respectively.

9. The audio playback device of claim 8, wherein the thermal conductor comprises at least one of a graphite sheet and a copper foil.

10. An electronic device comprising a device main body and the audio playback apparatus according to any one of claims 1 to 9, the audio playback apparatus being assembled to the device main body.