Double-sided sound production monomer and electronic equipment

Abstract

The utility model relates to the technical field of electro-acoustic conversion, and provides a double-sided sound production monomer and electronic equipment, and the double-sided sound production monomer comprises a housing assembly. The magnetic circuit system is provided with a first magnetic gap and a second magnetic gap; the first vibration system comprises a first vibrating diaphragm assembly and a first voice coil, one end of the first voice coil is connected with the first vibrating diaphragm assembly, the other end of the first voice coil is arranged corresponding to the first magnetic gap, the second vibration system comprises a second vibrating diaphragm assembly and a second voice coil, one end of the second voice coil is connected with the second vibrating diaphragm assembly, and the other end of the second voice coil is arranged corresponding to the second magnetic gap. The effective radiation area of the first vibrating diaphragm assembly is SD1, the effective radiation area of the second vibrating diaphragm assembly is SD2, and SD1 / SD2 is larger than or equal to 0.7 and smaller than or equal to 1.45. When the two vibration systems of the double-sided sound production single body vibrate in opposite directions, a good stereo effect can be achieved, when the two vibration systems vibrate in the same direction, sound waves on the two sides can be fully offset in a far field, and the privacy call effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electroacoustic conversion, in particular to a double-sided sound-emitting monomer and electronic equipment. Background Art

[0002] With the expansion of the consumer electronics market, a large number of consumer electronics products such as mobile phones and laptops have been widely used. As an important acoustic component in consumer electronics, speakers are widely needed. As people's requirements for consumer electronics products increase, the performance of speakers is also attracting more and more attention.

[0003] Mobile terminal devices such as smart phones usually have two speakers, one of which is located at the bottom of the phone. It has high sensitivity and good mid- and high-frequency sound, so it is often used as an external speaker to play incoming call ringtones or music; the other speaker is located at the top of the phone. It has low sensitivity and good low-frequency sound, so it is often used as a receiver during calls. The stereo playback effect of current mobile terminal devices is very unsatisfactory, and when used close to the user's ear to answer a call, there is usually a problem of sound leakage, which is very detrimental to the protection of personal privacy.

[0004] Based on the above problems, smart terminals are required to have privacy protection functions when making calls, have sufficient loudness when playing audio content, and pursue higher sound quality when enjoying music. However, conventional speakers have only one diaphragm and can only emit sound on one side, which cannot meet various functional requirements. In the current conventional design, multiple conventional sound-emitting devices are placed inside the smart terminal to solve the above problems. However, the method of simply placing more conventional sound-emitting devices not only increases the design difficulty of the smart terminal, but also increases the manufacturing cost of the smart terminal.

[0005] The current solution is to design the speaker as a double-sided sound-emitting device, and to enhance the stereo sound or reduce the far-field sound leakage by controlling the phase of the double-sided speakers to be in phase or out of phase. However, this design requires controlling the effective radiation area on both sides of the speaker. The difference in effective radiation area is directly related to the frequency response and total harmonic distortion difference of the product. To ensure that the speaker achieves good results, it is necessary to ensure that the frequency response emitted by both sides of the speaker is within the range of 100Hz-4kHz, the loudness difference is controlled within ±2dB, and the total harmonic distortion difference on both sides needs to be kept within 5%. However, the currently disclosed design solutions are difficult to meet the above parameter requirements. Utility Model Content

[0006] In order to overcome the defects of the prior art pointed out above, the utility model provides a double-sided sound-emitting unit and an electronic device. When the two vibration systems of the double-sided sound-emitting unit vibrate in opposite directions, the sound waves on both sides are in phase and superimposed to have a good stereo effect. When the two vibration systems vibrate in the same direction, the sound waves on both sides are in phase and can be fully offset in the far field, thereby improving the privacy call effect.

[0007] In order to solve the above technical problems, the technical solution of the utility model is:

[0008] A double-sided sound-emitting unit, comprising: a shell assembly;

[0009] A magnetic circuit system, the magnetic circuit system is connected to the housing assembly, the magnetic circuit system is provided with a first magnetic gap and a second magnetic gap;

[0010] A first vibration system and a second vibration system, wherein the first vibration system and the second vibration system are arranged on opposite sides of the magnetic circuit system, the first vibration system includes a first diaphragm assembly and a first voice coil, the outer periphery of the first diaphragm assembly is fixed to the shell assembly, one end of the first voice coil is connected to the first diaphragm assembly, and the other end of the first voice coil is arranged corresponding to the first magnetic gap, and the second vibration system includes a second diaphragm assembly and a second voice coil, the outer periphery of the second diaphragm assembly is fixed to the shell assembly, one end of the second voice coil is connected to the second diaphragm assembly, and the other end of the second voice coil is arranged corresponding to the second magnetic gap, wherein,

[0011] The effective radiation area of ​​the first diaphragm assembly is SD1, the effective radiation area of ​​the second diaphragm assembly is SD2, and 0.7≤SD1 / SD2≤1.45.

[0012] According to some embodiments of the present invention, the first diaphragm assembly includes a first diaphragm and a first vibration plate arranged on the first diaphragm, the outer periphery of the first diaphragm is fixed to the shell assembly, the area of ​​the first diaphragm is S11, the area of ​​the first vibration plate is S12, and 1.32≤S11 / S12≤3.18.

[0013] According to some embodiments of the present invention, the second diaphragm assembly includes a second diaphragm and a second vibration plate arranged on the second diaphragm, the outer periphery of the second diaphragm is fixed to the shell assembly, the area of ​​the second diaphragm is S21, the area of ​​the second vibration plate is S22, and 1.32≤S21 / S22≤3.22.

[0014] According to some embodiments of the present invention, the first vibration system further includes a first centering support, one end of which is connected to an end of the first voice coil facing away from the first diaphragm assembly, and the other end of the first centering support is connected to the shell assembly; the second vibration system further includes a second centering support, an outer periphery of which is fixed to the shell assembly, and the second centering support is located between the second voice coil and the second diaphragm assembly;

[0015] Among them, the second diaphragm assembly includes a second fold ring, the second fold ring is recessed in a direction away from the second centering support plate, and the first diaphragm assembly includes a first fold ring, and the recessed direction of the first fold ring is the same as the recessed direction of the second fold ring.

[0016] According to some embodiments of the utility model, the magnetic circuit system includes an inner magnetic circuit, an outer magnetic circuit and a magnetic yoke installed on the shell assembly, the magnetic yoke includes a main body and a bent extension portion that bends and extends from the main body toward the second vibration system and the inner magnetic circuit, the inner magnetic circuit is connected to the main body, and the outer magnetic circuit is connected to the bent extension portion.

[0017] In some embodiments of the present invention, the bent extension portion includes a first connection portion connected to the main body portion, along the vibration direction of the first vibration system or the second vibration system, at least part of the first connection portion extends in a direction close to the second diaphragm assembly, the first magnetic gap is formed between the first connection portion and the external magnetic circuit, and the second magnetic gap is formed between the first connection portion and the internal magnetic circuit;

[0018] One end of the first connection portion away from the main body portion horizontally extends toward the shell assembly to form a second connection portion, the second connection portion is connected to the shell assembly, and the external magnetic circuit is connected to the second connection portion.

[0019] In some embodiments of the present invention, the main body, the first connecting portion and the second connecting portion are formed as an integral stretch-molded structure.

[0020] In some embodiments of the present invention, the inner magnetic circuit includes a central magnet and a central magnetic conductive plate, the central magnet is mounted on the main body, and the central magnetic conductive plate is mounted on a side of the central magnet away from the main body;

[0021] The external magnetic circuit includes a side magnet and a side magnetic conductive plate. The side magnet is connected to the second connecting portion. The side magnetic conductive plate is connected to the side of the side magnet away from the second connecting portion. The end of the side magnetic conductive plate away from the first voice coil is connected to the shell assembly.

[0022] According to some embodiments of the utility model, the double-sided sound-emitting unit has a first working state and a second working state. In the first working state, the first diaphragm assembly and the second diaphragm assembly radiate sound waves with the same phase outwardly. In the second working state, the first diaphragm assembly and the second diaphragm assembly radiate sound waves with opposite phases outwardly.

[0023] The utility model also provides an electronic device, which comprises the double-sided sound-emitting unit according to the above embodiment of the utility model.

[0024] After adopting the above technical solution, the beneficial effects of the utility model are:

[0025] According to the double-sided sound-emitting unit of the embodiment of the utility model, it includes a shell assembly, a magnetic circuit system, a first vibration system and a second vibration system. The first vibration system and the second vibration system are arranged on opposite sides of the magnetic circuit system, thereby realizing double-sided sound. At the same time, since the first vibration system and the second vibration system share the magnetic circuit system, the design structure of the double-sided sound-emitting unit is simplified, so that the overall thickness of the double-sided sound-emitting unit will not be too large, thereby reducing the space occupied in the electronic device, which is conducive to miniaturization design. In addition, through the above-mentioned structural design, when the sound waves generated by the first vibration system and the second vibration system are in the same phase, the sound waves are superimposed and enhanced, thereby improving the stereo effect of the speaker in the external speaker mode. When the sound waves generated by the first vibration system and the second vibration system are in opposite phases, the sound waves are offset and attenuated in the far field, thereby improving the privacy protection effect in the handset call mode.

[0026] In addition, the first vibration system includes a first diaphragm assembly, and the effective radiation area of ​​the first diaphragm assembly is SD1. The second vibration system includes a second diaphragm assembly, and the effective radiation area of ​​the second diaphragm assembly is SD2. When 0.7≤SD1 / SD2≤1.45, the frequency response emitted by the two sounding surfaces of the double-sided sounding unit can be within the range of 100Hz-4kHz, the loudness difference is controlled within ±2dB, and the total harmonic distortion difference between the two sides is kept within 5%, thereby improving the sound quality effect of the double-sided sounding unit. At the same time, the above structure is simple to implement, low cost, and easy to control.

[0027] In summary, the utility model provides a double-sided sound-emitting unit and an electronic device. When the two vibration systems of the double-sided sound-emitting unit vibrate in opposite directions, the sound waves on both sides have the same phase and are superimposed to have a good stereo effect. When the two vibration systems vibrate in the same direction, the sound waves on both sides have opposite phases and can fully offset each other in the far field, thereby improving the privacy call effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without creative work. In addition, in the drawings, the components or parts are not necessarily drawn according to the actual scale.

[0029] Figure 1 It is a schematic diagram of the front structure of a double-sided sound-emitting unit according to an embodiment of the utility model;

[0030] Figure 2 It is a schematic diagram of the reverse structure of a double-sided sound-emitting unit according to an embodiment of the utility model;

[0031] Figure 3 It is a schematic cross-sectional structure diagram of a double-sided sound-emitting unit along the long axis direction according to an embodiment of the utility model;

[0032] Figure 4 It is a schematic cross-sectional structure diagram of a double-sided sound-emitting unit along the short axis direction according to an embodiment of the utility model;

[0033] Figure 5 It is a schematic diagram of the exploded structure of a double-sided sound-emitting unit according to an embodiment of the utility model;

[0034] Reference numerals:

[0035] 1. Shell assembly, 101. first shell, 102. second shell, 103. connection part, 104. connection terminal;

[0036] 2. Magnetic circuit system, 201. inner magnetic circuit, 2011. center magnet, 2012. center magnetic plate, 202. outer magnetic circuit, 2021. side magnet, 2022. side magnetic plate, 203. magnetic yoke, 2031. main body, 2032. first connecting part, 2033. second connecting part;

[0037] 3. First vibration system, 301. First diaphragm assembly, 3011. First diaphragm, 3012. First vibration plate, 3013. First folding ring, 302. First voice coil, 303. First centering support plate;

[0038] 4. second vibration system, 401. second diaphragm assembly, 4011. second diaphragm, 4012. second vibration plate, 4013. second folding ring, 402. second voice coil, 403. second centering support;

[0039] 5. First magnetic gap, 6. Second magnetic gap, 7. Front cover, 701. Main body, 702. Installation part, 8. Dust screen, 100. Double-sided sound unit. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0042] At the same time, the meaning of "and / or" or "and / or" appearing in the full text includes three options. Taking "A and / or B" as an example, it includes option A, or option B, or a option in which both A and B are satisfied.

[0043] In addition, in the present utility model, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0044] The present invention proposes a double-sided sound-emitting unit 100. It can be understood that the double-sided sound-emitting unit 100 is applied to electronic devices, such as mobile phones, speakers, computers, headphones, watches, televisions or tablet computers, etc., which are not limited here.

[0045] like Figure 1-Figure 5 As shown, the double-sided sound-emitting unit 100 according to the embodiment of the utility model comprises: a housing assembly 1;

[0046] The magnetic circuit system 2 is connected to the housing assembly 1 , and the magnetic circuit system 2 is provided with a first magnetic gap 5 and a second magnetic gap 6 .

[0047] The first vibration system 3 and the second vibration system 4 are arranged on opposite sides of the magnetic circuit system 2. The first vibration system 3 includes a first diaphragm assembly 301 and a first voice coil 302. The outer periphery of the first diaphragm assembly 301 is fixed to the shell assembly 1, one end of the first voice coil 302 is connected to the first diaphragm assembly 301, and the other end of the first voice coil 302 is arranged corresponding to the first magnetic gap 5. Specifically, the other end of the first voice coil 302 is inserted into the first magnetic gap 5. When power is on, the first voice coil 302 vibrates up and down under the action of the magnetic field force in the first magnetic gap 5, and drives the first diaphragm assembly 301 to vibrate and make sound. The second vibration system 4 includes a second diaphragm assembly 401 and a second voice coil 402. The outer periphery of the second diaphragm assembly 401 is fixed to the shell assembly 1. One end of the second voice coil 402 is connected to the second diaphragm assembly 401. The other end of the second voice coil 402 is arranged corresponding to the second magnetic gap 6. Specifically, the other end of the second voice coil 402 is inserted into the second magnetic gap 6. When the power is turned on, the second voice coil 402 vibrates up and down under the action of the magnetic field force in the second magnetic gap 6, and drives the second diaphragm assembly 401 to vibrate and make sound.

[0048] The effective radiation area of ​​the first diaphragm assembly 301 is SD1, the effective radiation area of ​​the second diaphragm assembly 401 is SD2, and 0.7≤SD1 / SD2≤1.45.

[0049] Specifically, the first vibration system 3 and the second vibration system 4 are arranged on opposite sides of the magnetic circuit system 2, and respectively drive the first diaphragm assembly 301 and the second diaphragm assembly 401 to produce sound through the first voice coil 302 and the second voice coil 402 when powered, thereby realizing double-sided sound. At the same time, since the first vibration system 3 and the second vibration system 4 share the magnetic circuit system 2, the design structure of the double-sided sound-emitting monomer 100 is simplified, so that the overall thickness of the double-sided sound-emitting monomer 100 is not too large, thereby reducing the space occupied in the electronic device, which is conducive to miniaturization design. In addition, through the above-mentioned structural design, when the sound waves generated by the first diaphragm assembly 301 and the second diaphragm assembly 401 are in the same phase, the sound waves are superimposed and enhanced, thereby improving the stereo effect of the terminal device in the external speaker mode; when the sound waves generated by the first diaphragm assembly 301 and the second diaphragm assembly 401 are in opposite phases, the sound waves generated by the first diaphragm assembly 301 and the second diaphragm assembly 401 are offset and attenuated in the far field (for example, 20cm-30cm away from the human ear), thereby improving the privacy protection effect of the terminal device in the handset call mode.

[0050] In addition, it can be understood that when SD1 / SD2 is less than 0.7 or SD1 / SD2 is greater than 1.45, that is, when the difference in the sound area between the first diaphragm assembly 301 and the second diaphragm assembly 401 is large, the frequency response and loudness of the sound waves emitted between the two sound emitting surfaces of the double-sided sound-emitting unit 100 are quite different. When in call mode, the sound waves generated by the two sound emitting surfaces generally cancel each other out in the far field, thereby affecting the effect of privacy calls. When 0.7≤SD1 / SD2≤1.45, the frequency response of the sound waves emitted between the two sound-emitting surfaces of the double-sided sound-emitting unit 100 can be within the range of 100Hz-4kHz, the loudness difference can be controlled within ±2dB, and the difference in total harmonic distortion between the two surfaces can be kept within 5%. Therefore, when the first vibration system 3 and the second vibration system 4 vibrate in opposite directions, the sound waves generated by the two sound-emitting surfaces have the same phase and are superimposed to ensure that the double-sided sound-emitting unit 100 has a good stereo effect. Moreover, when the first vibration system 3 and the second vibration system 4 vibrate in the same direction, the sound waves generated by the two sound-emitting surfaces have opposite phases and can be fully offset in the far field, thereby improving the effect of private calls. At the same time, the above structure is simple to implement, low in cost, and easy to control. Optionally, SD1 / SD2 can be 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, and 1.45, etc.

[0051] like Figure 3-Figure 5 As shown, in some embodiments of the utility model, the first diaphragm assembly 301 includes a first diaphragm 3011 and a first vibration plate 3012 arranged on the first diaphragm 3011. In this embodiment, the first vibration plate 3012 is arranged on a side of the first diaphragm 3011 close to the magnetic circuit system 2. The outer periphery of the first diaphragm 3011 can be fixed to the shell assembly 1 by a bonding process, and the inner periphery of the first diaphragm 3011 is connected to the first vibration plate 3012. The area of ​​the first diaphragm 3011 is S11, and the area of ​​the first vibration plate 3012 is S12, 1.32≤S11 / S12≤3.18. Since the effective radiation area is determined by the diaphragm area and the vibration plate area, by controlling the ratio of the area S11 of the first diaphragm 3011 to the area S12 of the first vibration plate 3012 to 1.32≤S11 / S12≤3.18, the sound quality effect of the speaker is guaranteed, and the frequency response and total harmonic distortion difference are guaranteed to be within the best use effect range. Optionally, S11 / S12 can be 1.32, 1.5, 2, 2.5, 3, 3.18, etc.

[0052] Specifically, the effective radiation area SD is composed of the diaphragm area S 振膜 and the vibration plate area S dome OK, the calculation formula is as follows:

[0053]

[0054] Sdome =S 振膜 -S 振膜折环 ----------(Formula 2)

[0055] When the folding ring width of the diaphragm is 0.4mm-1.6mm, the effective radiation area SD on both sides of the double-sided sound unit 100 is within 0.7≤SD1 / SD2≤1.45, and the total harmonic distortion difference on both sides of the double-sided sound unit 100 is kept within 5%. To achieve optimal product sound quality, the ratio of S11 and S12 of the first vibration system 3 needs to be controlled within 1.32≤S11 / S12≤3.18.

[0056] Therefore, when SD2 is constant, within the range of 0.7≤SD1 / SD2≤1.45, the SD1 value can be calculated. When the diaphragm surround width is within the range of 0.4mm-1.6mm, the ratio of S11 to S12 can be deduced to be 1.32≤S11 / S12≤3.18 according to Formula 1 and Formula 2.

[0057] like Figure 3-Figure 5 As shown, in some embodiments of the utility model, the second diaphragm assembly 401 includes a second diaphragm 4011 and a second vibration plate 4012 arranged on the second diaphragm 4011. In this embodiment, the second vibration plate 4012 is arranged on the side of the second diaphragm 4011 away from the magnetic circuit system 2. The outer periphery of the second diaphragm 4011 can be fixed to the shell assembly 1 by a bonding process, and the inner periphery of the second diaphragm 4011 is connected to the second vibration plate 4012. The area of ​​the second diaphragm 4011 is S21, and the area of ​​the second vibration plate 4012 is S22, 1.32≤S21 / S22≤3.22. Since the effective radiation area is determined by the diaphragm area and the vibration plate area, by controlling the ratio of the area S21 of the second diaphragm 4011 to the area S22 of the second vibration plate 4012 to 1.32≤S21 / S22≤3.22, the sound quality effect of the speaker is guaranteed, and the frequency response and total harmonic distortion difference are guaranteed to be within the best usage effect range. Optionally, S21 / S22 can be 1.32, 1.5, 2, 2.5, 3, 3.18, etc.

[0058] According to the above-mentioned formulas 1 and 2, when the effective radiation area SD on both sides of the double-sided sound unit 100 is within 0.7≤SD1 / SD2≤1.45, the total harmonic distortion difference on both sides of the double-sided sound unit 100 is kept within 5%, and the product sound quality is optimal. In this case, the ratio of S21 and S22 of the second vibration system 4 needs to be controlled within 1.32≤S21 / S22≤3.22.

[0059] Therefore, when SD1 is constant, within the range of 0.7≤SD1 / SD2≤1.45, the SD2 value can be calculated. When the diaphragm ring width is in the range of 0.4mm-1.6mm, according to Formula 1 and Formula 2, it can be deduced that the ratio of S21 and S22 is 1.32≤S21 / S22≤3.22.

[0060] like Figure 3-Figure 5 As shown, in some embodiments of the utility model, the first vibration system 3 also includes a first centering support plate 303, one end of the first centering support plate 303 is connected to one end of the first voice coil 302 facing away from the first diaphragm assembly 301, and the other end of the first centering support plate 303 is connected to the shell assembly 1, and the first centering support plate 303 connects and supports the first voice coil 302.

[0061] The second vibration system 4 also includes a second centering support piece 403, the outer periphery of which is fixed to the shell assembly 1, and the second centering support piece 403 is located between the second voice coil 402 and the second diaphragm assembly 401. The second centering support piece 403 can provide a good connection and support effect for the second voice coil 402, thereby improving the stability of the second voice coil 402. At the same time, since the second centering support piece 403 is provided with an elastic deformation structure, the vibration effect of the second voice coil 402 is guaranteed so that it does not affect the acoustic effect. At the same time, since the second centering support piece 403 is also connected to the second diaphragm assembly 401, when the second voice coil 402 vibrates, it will also drive the second diaphragm assembly 401 to vibrate and sound synchronously, thereby realizing the sound effect of the second vibration system 4.

[0062] The second diaphragm assembly 401 includes a second folded ring 4013, which is recessed in a direction away from the second centering support 403. In view of the design structure that the second centering support 403 is located between the second voice coil 402 and the second diaphragm assembly 401, the second folded ring 4013 is recessed in a direction away from the second centering support 403 to prevent the second diaphragm assembly 401 from touching the second centering support 403 when vibrating, thereby affecting the sound quality. The first diaphragm assembly 301 includes a first folded ring 3013, and the recessed direction of the first folded ring 3013 is the same as the recessed direction of the second folded ring 4013. By setting the recessed direction of the first folded ring 3013 to be the same as the recessed direction of the second folded ring 4013, the first folded ring 3013 can be recessed into the shell assembly 1, thereby reducing the thickness of the double-sided sound-emitting unit 100, so that the double-sided sound-emitting unit 100 can be made thinner.

[0063] In addition, the second centering support plate 403 can also be arranged at the end of the second voice coil 402 facing away from the second diaphragm assembly 401. At this time, the inner fixing portion of the second centering support plate 403 is connected to the second voice coil 402, and the outer fixing portion is connected to the shell assembly 1. The end of the second voice coil 402 away from the second centering support plate 403 is connected to the second diaphragm assembly 401, and the outer periphery of the second diaphragm assembly 401 is fixed to the shell assembly 1. At this time, the second folding ring 4013 of the second diaphragm assembly 401 can be recessed into the shell assembly 1. At the same time, the first folding ring 3013 of the first diaphragm assembly 301 can also be recessed into the shell assembly 1, which further reduces the thickness of the double-sided sound unit 100 and can make the double-sided sound unit 100 thinner.

[0064] like Figure 3-Figure 5 As shown, in some embodiments of the utility model, the magnetic circuit system 2 includes an inner magnetic circuit 201, an outer magnetic circuit 202 and a magnetic yoke 203 installed on the shell assembly 1, the magnetic yoke 203 includes a main body 2031 and a bent extension portion bent and extended from the main body 2031 toward the second vibration system 4 and the inner magnetic circuit 201, the inner magnetic circuit 201 is connected to the main body 2031, and the outer magnetic circuit 202 is connected to the bent extension portion. Through the above-mentioned structural arrangement, the main body 2031 can be used as the magnetic yoke of the inner magnetic circuit 201, and the bent extension portion can be used as the magnetic yoke of the outer magnetic circuit 202, thereby making the structure of the magnetic yoke 203 in the magnetic circuit system 2 simple and compact, saving space and production costs.

[0065] like Figure 3-Figure 5 As shown, in an embodiment of the utility model, the bent extension portion includes a first connection portion 2032 connected to the main body portion 2031, and along the vibration direction of the first vibration system 3 or the second vibration system 4, at least part of the first connection portion 2032 extends toward the direction close to the second diaphragm assembly 401, and a first magnetic gap 5 is formed between the first connection portion 2032 and the external magnetic circuit 202, and a second magnetic gap 6 is formed between the first connection portion 2032 and the internal magnetic circuit 201. From the above, it can be seen that the first connection portion 2032 acts as an intermediate magnetic circuit, which is used in conjunction with the external magnetic circuit 202 and the internal magnetic circuit 201, which simplifies the magnetic circuit design structure of the double-sided sound-emitting unit 100, reduces the production volume of the double-sided sound-emitting unit 100, and reduces the material cost.

[0066] One end of the first connection part 2032 away from the main body part 2031 extends horizontally toward the shell assembly 1 to form the second connection part 2033. The second connection part 2033 is connected to the shell assembly 1, and the external magnetic circuit 202 is connected to the second connection part 2033. The second connection part 2033 acts as a magnetic yoke of the external magnetic circuit 202, and supports the external magnetic circuit 202. At the same time, since the second connection part 2033 is directly connected to the shell assembly 1, the entire magnetic yoke 203 can be fixed to improve the structural stability.

[0067] like Figure 3-Figure 5 As shown, in the embodiment of the utility model, the main body 2031, the first connecting part 2032 and the second connecting part 2033 are formed into an integral stretch-molded structure. The integral stretch-molded structure design is convenient for processing, simplifies the process flow and reduces costs.

[0068] like Figure 3-Figure 5 As shown, in the embodiment of the utility model, the inner magnetic circuit 201 includes a central magnet 2011 and a central magnetic conductive plate 2012. The central magnet 2011 is installed on the main body 2031. The main body 2031 can be used as a magnetic conductive yoke of the inner magnetic circuit 201. The central magnetic conductive plate 2012 is installed on the side of the central magnet 2011 away from the main body 2031. From the above, it can be seen that the central magnet 2011 and the central magnetic conductive plate 2012 serve as the central magnetic circuit, and form a second magnetic gap 6 with the first connecting portion 2032 of the bent extension portion, so that the second voice coil 402 can vibrate up and down when powered on.

[0069] The external magnetic circuit 202 includes a side magnet 2021 and a side magnetic conductive plate 2022. The side magnet 2021 is connected to the second connecting portion 2033. The second connecting portion 2033 can be used as a magnetic conductive yoke of the external magnetic circuit 202. The side magnetic conductive plate 2022 is connected to the side of the side magnet 2021 away from the second connecting portion 2033. The end of the side magnetic conductive plate 2022 away from the first voice coil 302 is connected to the shell assembly 1. By connecting the side magnetic conductive plate 2022 to the shell assembly 1, the structural stability of the external magnetic circuit 202 is improved.

[0070] like Figure 1-Figure 5 As shown, in some embodiments of the present invention, the housing assembly 1 includes a first housing 101 and a second housing 102, the first housing 101 and the second housing 102 are arranged correspondingly, the first diaphragm assembly 301 is arranged at one end of the first housing 101 away from the second housing 102, and the second diaphragm assembly 401 is arranged at one end of the second housing 102 away from the first housing 101. By dividing the housing assembly 1 into the first housing 101 and the second housing 102, injection molding is facilitated;

[0071] One side of the second housing 102 protrudes from the first housing 101 and forms a wiring portion 103. The wiring portion 103 is provided with a plurality of wiring terminals 104 connected to the first voice coil 302 and the second voice coil 402. The wiring surfaces of the plurality of wiring terminals 104 are located in the same plane. By providing the wiring portion 103, the wiring portion 103 is provided with a plurality of wiring terminals 104, and the wiring surfaces of the plurality of wiring terminals 104 are arranged in the same plane, which facilitates wiring.

[0072] like Figure 3-Figure 5As shown, in some embodiments of the utility model, a front cover 7 is further provided on the side of the first diaphragm assembly 301 facing away from the first shell 101, and the front cover 7 forms a sound outlet. The front cover 7 includes a main body 701 and a mounting portion 702 arranged around the main body 701, and the mounting portion 702 is connected to the positioning columns arranged on the first shell 101. The mounting portion 702 can be positioned by the positioning columns. After the positioning is completed, the front cover 7 is fixed to the first shell 101 by hot melting the positioning columns. The outer peripheral edge of the first diaphragm assembly 301 is arranged between the first shell 101 and the mounting portion 702. Since the outer peripheral edge of the first diaphragm assembly 301 is located between the first shell 101 and the mounting portion 702, the front cover 7 protects the diaphragm.

[0073] In addition, in this embodiment, a dustproof net 8 is installed on the side of the front cover 7 away from the first shell 101. The dustproof net 8 is provided to reduce the dust in the air from entering the double-sided sound-emitting unit 100 and affecting the performance of the double-sided sound-emitting unit 100.

[0074] like Figure 3-Figure 4 As shown, according to some embodiments of the utility model, the double-sided sound-emitting monomer 100 can have a first working state and a second working state. In the first working state, the first diaphragm assembly 301 and the second diaphragm assembly 401 radiate sound waves with the same phase outwardly, and in the second working state, the first diaphragm assembly 301 and the second diaphragm assembly 401 radiate sound waves with opposite phases outwardly. Therefore, when the double-sided sound-emitting monomer 100 is applied to a terminal device (such as a mobile phone), when the terminal device is in an external speaker mode, the double-sided sound-emitting monomer 100 enters the first working state, the first diaphragm assembly 301 and the second diaphragm assembly 401 radiate sound waves with the same phase outwardly, and the two-sided sound waves are superimposed on each other, which can improve the external speaker effect of the terminal device. When the terminal device is in the handset mode, the double-sided sound-emitting monomer 100 enters the second working state, the first diaphragm assembly 301 and the second diaphragm assembly 401 radiate sound waves with opposite phases outwardly, and the two-sided sound waves cancel each other out in the far field (for example, a distance of 20cm-50cm from the human ear), thereby improving the privacy protection effect when the terminal device is talking.

[0075] The utility model also proposes an electronic device, which includes a double-sided sound-emitting unit 100. The specific structure of the double-sided sound-emitting unit 100 refers to the aforementioned embodiment. Since the electronic device adopts all the technical solutions of all the aforementioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the aforementioned embodiments, which will not be described one by one here.

[0076] In addition, the double-sided sound unit 100 can also be assembled with the shell into a sound module, and installed in the electronic device in the form of a sound module.

[0077] It is understandable that the electronic device may be a mobile phone, a speaker, a computer, a headset, a watch, a television or a tablet computer, etc., and is not limited here.

[0078] It should be understood that the purpose of these embodiments is only to illustrate the utility model and is not intended to limit the protection scope of the utility model. In addition, it should also be understood that after reading the technical content of the utility model, those skilled in the art can make various changes, modifications and / or variations to the utility model, and all of these equivalent forms also fall within the protection scope defined by the claims attached to this application.

Claims

1. A double-sided sound-emitting unit, characterized in that: include: Shell assembly; A magnetic circuit system, the magnetic circuit system is connected to the housing assembly, the magnetic circuit system is provided with a first magnetic gap and a second magnetic gap; A first vibration system and a second vibration system, wherein the first vibration system and the second vibration system are arranged on opposite sides of the magnetic circuit system, the first vibration system includes a first diaphragm assembly and a first voice coil, the outer periphery of the first diaphragm assembly is fixed to the shell assembly, one end of the first voice coil is connected to the first diaphragm assembly, and the other end of the first voice coil is arranged corresponding to the first magnetic gap, and the second vibration system includes a second diaphragm assembly and a second voice coil, the outer periphery of the second diaphragm assembly is fixed to the shell assembly, one end of the second voice coil is connected to the second diaphragm assembly, and the other end of the second voice coil is arranged corresponding to the second magnetic gap, wherein, The effective radiation area of ​​the first diaphragm assembly is SD1, the effective radiation area of ​​the second diaphragm assembly is SD2, and 0.7≤SD1 / SD2≤1.

45.

2. The double-sided sound-emitting unit according to claim 1, characterized in that: The first diaphragm assembly includes a first diaphragm and a first vibration plate arranged on the first diaphragm, the outer periphery of the first diaphragm is fixed to the shell assembly, the area of ​​the first diaphragm is S11, the area of ​​the first vibration plate is S12, and 1.32≤S11 / S12≤3.

18.

3. The double-sided sound-emitting unit according to claim 1, characterized in that: The second diaphragm assembly includes a second diaphragm and a second vibration plate arranged on the second diaphragm, the outer periphery of the second diaphragm is fixed to the shell assembly, the area of ​​the second diaphragm is S21, the area of ​​the second vibration plate is S22, and 1.32≤S21 / S22≤3.

22.

4. The double-sided sound-emitting unit according to claim 1, characterized in that: The first vibration system further includes a first centering support, one end of which is connected to an end of the first voice coil facing away from the first diaphragm assembly, and the other end of the first centering support is connected to the shell assembly; the second vibration system further includes a second centering support, an outer periphery of which is fixed to the shell assembly, and the second centering support is located between the second voice coil and the second diaphragm assembly; Among them, the second diaphragm assembly includes a second fold ring, the second fold ring is recessed in a direction away from the second centering support plate, and the first diaphragm assembly includes a first fold ring, and the recessed direction of the first fold ring is the same as the recessed direction of the second fold ring.

5. The double-sided sound-emitting unit according to claim 1, characterized in that: The magnetic circuit system includes an inner magnetic circuit, an outer magnetic circuit and a magnetic yoke installed on the shell assembly. The magnetic yoke includes a main body and a bent extension portion that bends and extends from the main body toward the second vibration system and the inner magnetic circuit. The inner magnetic circuit is connected to the main body, and the outer magnetic circuit is connected to the bent extension portion.

6. The double-sided sound-emitting unit according to claim 5, characterized in that: The bent extension portion includes a first connection portion connected to the main body portion, along the vibration direction of the first vibration system or the second vibration system, at least a portion of the first connection portion extends toward the direction close to the second diaphragm assembly, the first magnetic gap is formed between the first connection portion and the external magnetic circuit, and the second magnetic gap is formed between the first connection portion and the internal magnetic circuit; One end of the first connection portion away from the main body portion horizontally extends toward the shell assembly to form a second connection portion, the second connection portion is connected to the shell assembly, and the external magnetic circuit is connected to the second connection portion.

7. The double-sided sound-emitting unit according to claim 6, characterized in that: The main body, the first connecting portion and the second connecting portion are formed as an integral stretch-molded structure.

8. The double-sided sound-emitting unit according to claim 6, characterized in that: The inner magnetic circuit includes a central magnet and a central magnetic conductive plate, wherein the central magnet is mounted on the main body, and the central magnetic conductive plate is mounted on a side of the central magnet away from the main body; The external magnetic circuit includes a side magnet and a side magnetic conductive plate. The side magnet is connected to the second connecting portion. The side magnetic conductive plate is connected to the side of the side magnet away from the second connecting portion. The end of the side magnetic conductive plate away from the first voice coil is connected to the shell assembly.

9. The double-sided sound-emitting unit according to any one of claims 1 to 8, characterized in that: The double-sided sound-emitting unit has a first working state and a second working state. In the first working state, the first diaphragm assembly and the second diaphragm assembly radiate sound waves with the same phase outwardly. In the second working state, the first diaphragm assembly and the second diaphragm assembly radiate sound waves with opposite phases outwardly.

10. An electronic device, characterized in that: The electronic device comprises the double-sided sound-emitting unit according to any one of claims 1 to 9.

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