CN113542994B

CN113542994B - Electroacoustic transducer and electronic equipment

Info

Publication number: CN113542994B
Application number: CN202010288264.7A
Authority: CN
Inventors: 李东科
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-04-14
Filing date: 2020-04-14
Publication date: 2023-03-10
Anticipated expiration: 2040-04-14
Also published as: CN113542994A

Abstract

The application relates to the technical field of electroacoustic conversion, in particular to an electroacoustic transducer and electronic equipment. The electroacoustic transducer comprises a vibration system, a magnetic circuit system, a bracket and a centering support piece, wherein the vibration system comprises a framework and a voice coil; the magnetic circuit system comprises a magnetic yoke, a first magnet and a magnetic conductive plate, a magnetic field gap is formed between the magnetic yoke and the first magnet, and a gap communicated with the magnetic field gap is formed in the magnetic yoke along the axial direction of the framework; the magnetic circuit system is fixed on the bracket; the first end of the centering support piece is fixed at the bottom end of the framework and/or the voice coil through the notch, and the second end of the centering support piece is fixed at the support. The first end of the centering support piece is fixed in the bottom of the framework and/or the voice coil through the notch, so that the position of the centering support piece is more downward, the centering support piece and the lead are ensured not to touch a magnetic circuit system or generate noise due to mutual touch, namely, the electroacoustic transducer is not required to be arranged in a higher height space, and the thinning of the electroacoustic transducer is facilitated.

Description

Electroacoustic transducer and electronic equipment

Technical Field

The application relates to the technical field of electroacoustic conversion, in particular to an electroacoustic transducer and electronic equipment.

Background

With the smart large screen entering thousands of households more and more, the experience requirement of people on the sound quality is higher and higher, however, the smart large screen is developing towards thinning, so that the thin electroacoustic transducer is also required to be adapted.

As shown in fig. 1, an electroacoustic transducer (i.e. a moving-coil electroacoustic transducer) is taken as an example of an exciter, and the electroacoustic transducer comprises a vibration system 1', a magnetic circuit system 2', a bracket 3 'and a centering chip 4', wherein: the vibration system 1' comprises a cover 13', a framework 11' fixed with the cover 13', and a voice coil 12' fixed at one end of the framework 11' far away from the cover 13', wherein the voice coil 12' is electrically connected with an external circuit through a lead 121 '; the magnetic circuit system 2' includes a U-shaped magnetic yoke 21', a magnet 22' disposed in the U-shaped magnetic yoke 21', and a magnetic conductive plate 23' disposed above the magnet 22', a magnetic field gap 24' is formed between the U-shaped magnetic yoke 21' and the magnet 22' and the magnetic conductive plate 23' disposed therein, and a portion of the bobbin 11' where the voice coil 12' is disposed is accommodated in the magnetic field gap 24 '; one end of the centering support 4' is fixed on the voice coil 12', the other end of the centering support is fixed on the support 3', and the centering support 4' can effectively prevent the voice coil 12' from polarizing in the vibration process; the bracket 3 'is fixed with the U-shaped magnetic yoke 21'. When the voice coil 12' receives an audio signal, the voice coil 12' moves along the axial direction thereof under the action of the magnetic field in the magnetic field gap 24', so that the cover 13' is pushed by the bobbin 11' to vibrate; when the cover 13' is tightly attached to a flat thin plate (i.e. a sound-producing portion of an electronic device, such as a screen), the flat thin plate can be pushed to produce sound in the air. It will be appreciated that when the electroacoustic transducer is a loudspeaker, the cover 13 'may be replaced by a diaphragm, which is pushed by the frame 11' to perform a piston movement, thereby pushing ambient air to move to generate sound.

In the electroacoustic transducer shown in fig. 1, the whole of the centering pad 4' is located above the magnetic circuit system 2', and since the electroacoustic transducer needs a vibration space during operation, in order to ensure that the centering pad 4' and the lead wire 121' do not touch the magnetic circuit system 2' or that the two do not generate noise due to mutual touch, the electroacoustic transducer needs to be provided with a high height space, which is not favorable for thinning the electroacoustic transducer.

Therefore, there is a need for an electroacoustic transducer and an electronic device to solve the above problems.

Disclosure of Invention

The application provides an electroacoustic transducer and an electronic device, which are beneficial to thinning of the electroacoustic transducer.

In a first aspect, an embodiment of the present application provides an electroacoustic transducer, including:

the vibration system comprises a framework and a voice coil arranged at one end of the framework;

the magnetic circuit system comprises a magnetic conduction yoke, a first magnet arranged in the magnetic conduction yoke and a magnetic conduction plate arranged on the first magnet, a magnetic field gap is formed between the magnetic conduction yoke and the first magnet, one end, provided with the voice coil, of the framework is arranged in the magnetic field gap, and a notch communicated with the magnetic field gap is formed in the magnetic conduction yoke along the axial direction of the framework;

the magnetic circuit system is fixed on the bracket;

the first end of the centering support piece is fixed on the framework and/or the bottom end of the voice coil through the notch, and the second end of the centering support piece is fixed on the support.

In a possible design, the centering disk is of a flat plate structure, and the centering disk is made of a metal material.

In one possible design, the spider is provided with a connecting portion and a hollow portion which are arranged between the first end portion and the second end portion, the connecting portion is respectively connected with the first end portion and the second end portion, the support is provided with an avoiding portion, and the connecting portion is arranged above the avoiding portion.

In one possible design, the magnetic circuit system further includes a second magnet disposed on the magnetic conductive plate.

In a possible design, the magnetic circuit system further includes a cover made of metal, the cover is disposed between the magnetic conductive plate and the second magnet, and the cover at least covers the periphery of the magnetic conductive plate.

In one possible design, the bracket is provided with a first mounting part, the magnetic yoke is provided with a second mounting part, and the first mounting part and the second mounting part are connected;

along the axial direction of skeleton, the first surface that the skeleton was kept away from to the support with the yoke is kept away from the second surface of skeleton flushes.

In one possible design, the magnetic conductive yoke includes:

a first magnetic yoke on which the first magnet is disposed;

the second magnetic conduction yoke is arranged on the first magnetic conduction yoke and arranged on the periphery of the first magnet, the magnetic field gap is formed between the second magnetic conduction yoke and the first magnet, and the second magnetic conduction yoke is provided with the notch;

the first magnetic yoke and the second magnetic yoke are of an integrated structure.

In a possible design, the first magnetic conductive yoke and the second magnetic conductive yoke are provided with the notches, along the axial direction of the framework, the projection of the second magnetic conductive yoke onto the first magnetic conductive yoke is square, the notches are arranged at four corners of the magnetic conductive yoke, and the first end portion is of a square structure.

In a possible design, the vibration system further includes a cover or a diaphragm, and the cover or the diaphragm is fixed to an end of the bobbin away from the voice coil.

In a second aspect, embodiments of the present application provide an electronic device including an electroacoustic transducer as described above.

It is thus clear that the electroacoustic transducer that this application provided is through seting up the breach with magnetic field gap intercommunication on the yoke to make the first end of centering branch piece be fixed in the bottom of skeleton and/or voice coil loudspeaker voice coil through the breach, thereby make the position of centering branch piece lean on more down, guaranteed that centering branch piece and lead wire can not touch magnetic circuit or the two can not produce the noise because of touching each other, no longer need set up higher high space with electroacoustic transducer promptly, do benefit to electroacoustic transducer's slimming like this.

Drawings

FIG. 1 is a schematic cross-sectional view of an electroacoustic transducer provided in the background art;

fig. 2 is a schematic cross-sectional structure diagram of an electroacoustic transducer provided in an embodiment of the present application;

FIG. 3 is a front view of the electro-acoustic transducer of FIG. 2;

FIG. 4 is a top view of an electroacoustic transducer provided in accordance with an embodiment of the present application;

FIG. 5 is an exploded schematic view of an electroacoustic transducer provided in accordance with an embodiment of the present application;

FIG. 6 is a schematic diagram of a centering disk of the electroacoustic transducer of FIG. 5;

FIG. 7 is a schematic diagram of a mount for the electroacoustic transducer of FIG. 5;

FIG. 8 is a schematic diagram of a magnetic yoke of the electroacoustic transducer shown in FIG. 5;

fig. 9 is a schematic cross-sectional view of an electroacoustic transducer according to another embodiment of the present application;

fig. 10 is a schematic cross-sectional view of an electronic device according to an embodiment of the present application.

Reference numerals:

1' -a vibrating system;

11' -backbone;

12' -a voice coil;

121' -lead wire

13' -a lid;

2' -a magnetic circuit system;

21' -U-shaped magnetic yoke;

22' -a magnet;

23' -a magnetically permeable plate;

24' -magnetic field gap;

3' -a scaffold;

4' -a centering disk;

10-plane thin plate;

1-a vibration system;

11-a backbone;

12-a voice coil;

13-a cover body;

14-a diaphragm;

2-a magnetic circuit system;

21-a magnetic yoke;

21 a-a notch;

21 b-second mounting part

21 c-a second surface;

211-a first magnetic yoke;

212-a second magnetic yoke;

22-a first magnet;

23-a magnetic conductive plate;

24-a magnetic field gap;

25-a second magnet;

26-a cover body;

3-a scaffold;

31-a first mounting portion;

32-a first surface;

33-an escape portion;

4-centering the supporting sheet;

41-a first end portion;

42-a second end;

43-a connecting part;

44-hollowed out.

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

Detailed Description

The present application will be described in detail below with reference to the drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

In the description of the embodiments of the present application, the terms "first", "second", and the like, unless expressly specified or limited otherwise, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless otherwise specified or indicated; the terms "connected," "fixed," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, integrally connected, or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In the description of the present application, it should be understood that the terms "upper" and "lower" used in the description of the embodiments of the present application are used in a descriptive sense only and not for purposes of limitation. In addition, in this context, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on "or" under "the other element or be indirectly on" or "under" the other element through intervening elements.

As shown in fig. 2 and 4, an electroacoustic transducer provided by an embodiment of the present application includes a vibration system 1, a magnetic circuit system 2, a support 3, and a centering chip 4, wherein:

the vibration system 1 comprises a framework 11 and a voice coil 12 arranged at one end of the framework 11, the magnetic circuit system 2 comprises a magnetic yoke 21, a first magnet 22 arranged in the magnetic yoke 21 and a magnetic conductive plate 23 arranged on the first magnet 22, a magnetic field gap 24 is formed between the magnetic yoke 21 and the first magnet 22, and one end of the framework 11, provided with the voice coil 12, is arranged in the magnetic field gap 24. The electroacoustic transducer shown in fig. 2 and 3 is an exciter, and when the electroacoustic transducer is an exciter, the vibration system 1 further includes a cover 13, where the cover 13 is disposed at an end of the bobbin 11 away from the voice coil 12. When voice coil 12 receives an audio signal, voice coil 12 moves along its axial direction under the action of the magnetic field in magnetic field gap 24, so that cover 13 is pushed by bobbin 11 to vibrate; when the cover 13 is tightly attached to the flat thin plate 10 (see fig. 10, i.e. the sound-emitting portion of the electronic device, such as a screen), the flat thin plate 10 can be pushed to emit sound in the air as a whole.

It will be appreciated that when the electroacoustic transducer is a loudspeaker, the cover 13 may be replaced by a diaphragm 14 (see fig. 9), and the diaphragm 14 is pushed by the skeleton 11 to make a piston movement, so as to push ambient air to move to emit sound.

With continued reference to fig. 2 and 4, the yoke 21 is provided with a notch 21a (see fig. 8) communicating with the magnetic field gap 24 along the axial direction of the bobbin 11, the magnetic circuit system 2 is fixed to the support 3, the first end portion 41 (see fig. 6) of the yoke 4 is fixed to the bottom end of the bobbin 11 and/or the voice coil 12 through the notch 21a, and the second end portion 42 (see fig. 6) is fixed to the support 3. The electroacoustic transducer provided by the application is provided with the notch 21a communicated with the magnetic field gap 24 through the magnetic yoke 21, so that the first end part 41 of the centering branch piece 4 is fixed at the bottom end of the framework 11 or the voice coil 12 through the notch 21a, and the position of the centering branch piece 4 is lower, thereby ensuring that the centering branch piece 4 and a lead (not shown in the drawings except fig. 1, it can be understood that the lead is still connected with the voice coil 12) do not touch the magnetic circuit system 2 or the lead and the magnetic circuit system do not generate noise due to touch, namely, the electroacoustic transducer does not need to be provided with a higher height space, and the electroacoustic transducer is beneficial to thinning.

Furthermore, when the electroacoustic transducer is no longer required to be arranged in a higher height space, the high-frequency bandwidth of the electroacoustic transducer can be relatively improved. Referring to fig. 3, in some embodiments, the stiffener 4 is a flat plate structure, or the stiffener 4 is a flattened structure, so as to further reduce the probability of the stiffener 4 touching the lead during vibration, and facilitate the thinning of the electroacoustic transducer. The centering disk 4 is made of metal, so that the centering disk 4 can be made into a flat plate structure, and meanwhile, the centering disk has stronger fatigue resistance compared with a centering disk made of a non-metal composite material (such as mulberry paper) in the related art. In some implementations, the spider 4 may be made of a metal material such as copper or stainless steel, which may provide the spider 4 with a better fatigue resistance.

Referring to fig. 3 and 6, in some embodiments, the stiffener 4 is provided with a connecting portion 43 and a hollow portion 44 disposed between the first end portion 41 and the second end portion 42, the connecting portion 43 is connected to the first end portion 41 and the second end portion 42, respectively, the bracket 3 is provided with an avoiding portion 33, and the connecting portion 43 is disposed above the avoiding portion 33. Through setting up fretwork portion 44, so not only do benefit to the dead weight that reduces the centring disk 4, also more do benefit to centring disk 4 simultaneously and prevent polarization. By providing the escape portion 33, the connection portion 43 can be vibrated. In some embodiments, the connection portion 43 has a line structure, and may have a curved shape, for example.

In some embodiments, the magnetic circuit system 2 further includes a second magnet 25, and the second magnet 25 is disposed on the magnetic conductive plate 23. The second magnet 25 can increase the distribution width of the magnetic field, i.e., the linearity of the magnetic field, thereby facilitating the improvement of the smoothness of the movement of the voice coil 12 in the magnetic field gap 24.

In some embodiments, the magnetic circuit system 2 further includes a cover 26 made of metal, the cover 26 is disposed between the magnetic conductive plate 23 and the second magnet 25, and the cover 26 covers at least an outer periphery of the magnetic conductive plate 23. When the magnetic circuit system 2 is in operation, the cover 26 is provided to generate eddy currents in the cover 26, so that the high-frequency inductance of the voice coil 12 can be reduced, i.e., the short-circuit ring can function as a short-circuit ring (the short-circuit ring has the function of eliminating generated vibration and noise).

Referring to fig. 3 and 7, in some embodiments, the bracket 3 is provided with a first mounting portion 31, the yoke 21 is provided with a second mounting portion 21b, and the first mounting portion 31 and the second mounting portion 21b are connected, for example, fixed by gluing, or may be fixed by other fixing methods, which is not limited in this respect. Along the axial direction of the skeleton 11, the first surface 32 of the bracket 3 away from the skeleton 11 is flush with the second surface 21c of the magnetic yoke 21 away from the skeleton 11, so that the electroacoustic transducer can be ensured to have good appearance effect. Of course, the first surface 32 and the second surface 21c may not be flush.

Fig. 5 is an exploded view of an electroacoustic transducer according to an embodiment of the present application. During installation, the magnetic yoke 21 may be installed at the lower portion of the bracket 3, the first magnet 22, the magnetic conductive plate 23, the cover 26 and the second magnet 25 may be installed inside the magnetic yoke 21 in sequence, the damper 4 may be installed at the upper portion of the bracket 3, and finally the bottom end of the bobbin 11 and/or the voice coil 12 of the vibration system 1 and the first end portion 41 of the damper 4 may be fixed, for example, by gluing, so as to complete the assembly of the electroacoustic transducer.

Referring to fig. 3 and 8, in some embodiments, the magnetic yoke 21 includes a first magnetic yoke 211 and a second magnetic yoke 212, the first magnet 22 is disposed on the first magnetic yoke 211, the second magnetic yoke 212 is disposed on the first magnetic yoke 211 and is disposed on an outer periphery of the first magnet 22, a magnetic field gap 24 is formed between the second magnetic yoke 212 and the first magnet 22, and the second magnetic yoke 212 is provided with a notch 21a. The second magnetic yoke 212 may be vertically disposed on the first magnetic yoke 211, but may not be vertically disposed. In the present embodiment, the specific shapes of the first and

second yokes

211 and 212 are not particularly limited as long as the second yoke 212 is provided with the notch 21a. Of course, the number of the notches 21a is not limited in the present embodiment, and may be one or more, for example. In some implementations, the number of the notches 21a may be even, so that the balance of the damper 4 may be ensured, and thus the damper 4 may be ensured to effectively prevent polarization from occurring during vibration of the voice coil 12.

In some embodiments, the first yoke 211 and the second yoke 212 are formed as a single body, which can ensure the efficiency of forming the yoke 21. In other embodiments, the first yoke 211 and the second yoke 212 may be a split structure, for example, the second yoke 212 may be fixed to the first yoke 211 by gluing or other fixing methods.

With reference to fig. 8, in some embodiments, the first magnetic yoke 211 and the second magnetic yoke 212 are both provided with notches 21a, a projection of the second magnetic yoke 212 onto the first magnetic yoke 211 is square along the axial direction of the frame 11, the notches 21a are disposed at four corners of the magnetic yoke 21, and the first end portion 41 is a square structure. So set up, can facilitate the cooperation of centring disk 4 and yoke 21. Of course, as long as it is possible to realize that the damper 4 can be located in the magnetic field gap 24, for example, the damper 4 may be provided with an extension portion that may extend into the magnetic field gap 24 through the notch 21a to be fixed to the bottom end of the bobbin 11 and/or the voice coil 12. In the present embodiment, the specific shape of the first end portion 41 is not particularly limited, and the shape structure of the first end portion 41 may be adaptively adjusted according to actual needs, as long as the first end portion 41 can be directly or indirectly fixed to the bobbin 11 and/or the bottom end of the voice coil 12.

As shown in fig. 9, when the electroacoustic transducer is a loudspeaker, the cover 13 may be replaced by a diaphragm 14, the diaphragm 14 is fixed to an end of the bobbin 11 away from the voice coil 12, and the diaphragm 14 is pushed by the bobbin 11 to perform a piston motion, so as to push ambient air to move to emit sound. In the related art, the voice coil 12 'is located on the same side of the two suspension members (i.e., the cover 13' or the diaphragm, the damper 4 '), which may cause the voice coil 12' to have poor vibration effect. In the embodiment of the present application, the first end 41 of the damper 4 is fixed to the bottom end of the bobbin 11 and/or the voice coil 12 through the notch 21a, that is, the voice coil 12 is located between the cover 13 (or the diaphragm 14) and the damper 4, so that the vibration effect of the voice coil 12 can be increased.

As shown in fig. 10, embodiments of the present application also provide an electronic device comprising an electroacoustic transducer as mentioned above, which may be, for example, a driver or a speaker, wherein the electroacoustic transducer in the electronic device shown in fig. 10 is a driver. The electronic device comprises a planar thin plate 10 (which may be a screen, for example) and one or more electroacoustic transducers (fig. 10 is taken as an example), and a cover 13 is tightly attached (which may be fixed by gluing, for example) to the planar thin plate 10. When the voice coil 12 moves, the cover 13 can be pushed by the framework 11 to vibrate, and the flat thin plate 10 can be pushed to make sound in the air as a whole.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.

Claims

1. An electroacoustic transducer, comprising:

the vibration system (1) comprises a framework (11) and a voice coil (12) arranged at one end of the framework (11);

the magnetic circuit system (2), the magnetic circuit system (2) comprises a magnetic yoke (21), a first magnet (22) arranged in the magnetic yoke (21) and a magnetic conductive plate (23) arranged on the first magnet (22), a magnetic field gap (24) is formed between the magnetic yoke (21) and the first magnet (22), one end of the framework (11) provided with the voice coil (12) is arranged in the magnetic field gap (24), and the magnetic yoke (21) is provided with a notch (21 a) communicated with the magnetic field gap (24) along the axial direction of the framework (11);

a support (3), wherein the magnetic circuit system (2) is fixed on the support (3);

the first end (41) of the centering branch piece (4) is fixed at the bottom end of the framework (11) and/or the voice coil (12) through the notch (21 a), and the second end (42) of the centering branch piece (4) is fixed at the bracket (3);

the yoke (21) comprises:

a first magnetic yoke (211), the first magnet (22) being disposed on the first magnetic yoke (211);

a second yoke (212), wherein the second yoke (212) is disposed on the first yoke (211) and on the outer periphery of the first magnet (22), the magnetic field gap (24) is formed between the second yoke (212) and the first magnet (22), and the second yoke (212) is provided with the notch (21 a);

the first magnetic guide yoke (211) and the second magnetic guide yoke (212) are of an integrated structure;

the lead wire is connected with the voice coil (12);

the centering branch piece (4) is provided with a connecting portion (43) and a hollow portion (44) which are arranged between the first end portion (41) and the second end portion (42), the connecting portion (43) is respectively connected with the first end portion (41) and the second end portion (42), the support (3) is provided with an avoiding portion (33), and the connecting portion (43) is arranged above the avoiding portion (33).

2. The electroacoustic transducer of claim 1, wherein the centering branch piece (4) is a flat plate structure, and the centering branch piece (4) is made of metal.

3. The electro-acoustic transducer according to claim 1, wherein the magnetic circuit system (2) further comprises a second magnet (25), the second magnet (25) being disposed on the magnetically permeable plate (23).

4. The electro-acoustic transducer according to claim 3, wherein the magnetic circuit system (2) further comprises a cover (26) made of metal, the cover (26) is disposed between the magnetic conductive plate (23) and the second magnet (25), and the cover (26) covers at least an outer periphery of the magnetic conductive plate (23).

5. The electro-acoustic transducer according to claim 1, characterized in that the bracket (3) is provided with a first mounting portion (31), the yoke (21) is provided with a second mounting portion (21 b), and the first mounting portion (31) and the second mounting portion (21 b) are connected;

along the axial direction of skeleton (11), first surface (32) that skeleton (11) are kept away from to support (3) with the yoke (21) is kept away from second surface (21 c) of skeleton (11) are flush.

6. The electro-acoustic transducer according to claim 1, wherein the first and second magnetic yoke (211, 212) are each provided with the notch (21 a), a projection of the second magnetic yoke (212) onto the first magnetic yoke (211) is square along an axial direction of the bobbin (11), the notches (21 a) are provided at four corners of the magnetic yoke (21), and the first end portion (41) is a square structure.

7. The electroacoustic transducer of any of claims 1 to 6, wherein the vibration system (1) further comprises a cover (13) or a diaphragm (14), wherein the cover (13) or the diaphragm (14) is fixed to an end of the bobbin (11) remote from the voice coil (12).

8. An electronic device, characterized in that the electronic device comprises an electroacoustic transducer according to any of claims 1-7.