Loudspeaker

Abstract

The utility model provides a loudspeaker, which belongs to the field of loudspeakers and comprises a central supporting piece, a magnetic circuit assembly is arranged in the central supporting piece, an upper vibration assembly is arranged above the magnetic circuit assembly, a lower vibration assembly is arranged below the magnetic circuit assembly, and the upper vibration assembly and the lower vibration assembly are symmetrically arranged. The central support member and the magnetic circuit assembly separate the upper vibration assembly and the lower vibration assembly, air flows do not influence each other during vibration, and at the same time, the upper vibration assembly and the lower vibration assembly are the same vibration system and have identical compliance and quality during vibration, so that the vibration amplitude directions are opposite at all moments of vibration, and the vibration effect is good. The displacement is the same, and the sound pressure level is the same.

Description

Technical Field

[0001] The utility model relates to a loudspeaker. Background Art

[0002] Consumer electronics products such as TVs, laptops, tablets, and mobile phones are becoming thinner and thinner. The new energy vehicle industry also has similar thinning and lightweight requirements. Under the premise of thinning the structure, the requirements for acoustic performance are getting higher and higher. Traditional multimedia speaker products are difficult to make thin in structure because they have paper cones, fixed core supports, iron gas magnets and basin frames. Micro speaker products for mobile phones can be made thin, but due to the small area and electromagnetic driving force, the acoustic performance of the speaker cannot meet industry requirements. The details are shown in the following formula:

[0003]

[0004]

[0005] In the first formula above, SPLmax is the maximum sound pressure level of the speaker, which is usually referred to as the sound size, δ is the speaker efficiency, Rt is the total thermal resistance of the coil-to-environment path, and α is the thermal coefficient of the voice coil wire. From this formula, it can be seen that the higher the efficiency δ of the speaker, the greater its sound pressure level. In the second formula above, ρ is the air density, c is the air sound velocity, B is the magnetic field strength, l is the length of the speaker voice coil wire, Sd is the effective area of ​​the speaker, Re is the speaker coil resistance, and Mms is the mass of the speaker vibration system. From this formula, it can be seen that the efficiency of the speaker is proportional to (Bl)2 and Sd2, that is, the stronger the magnetic field strength, the longer the coil, and the larger the effective area of ​​the speaker, the higher the efficiency of the speaker, and ultimately the greater its sound pressure level. These are also three effective means to effectively improve the acoustic performance of the speaker.

[0006] If the area of ​​the micro speaker structure of a mobile phone is simply enlarged, it will easily lead to different performance effects on both sides.

[0007] Patent CN 114866925 A "Sound-generating device and sound-generating equipment" has three magnetic circuits, namely, a common magnet, a central magnet and a side magnet, and two voice coils of different sizes. This solution has three problems. First, the staggered design of the voice coils is an asymmetric structure, which makes it very difficult to achieve the performance and amplitude of both sides. Second, the two vibration systems use the same inner cavity, and the vibration system on one side is likely to affect the vibration system on the other side. Third, the magnetic circuit combination is complicated and assembly is difficult.

[0008] Patent CN 212324356 U, "A Speaker with Dual-Drive and Dual-Sided Sound Generation", shares a magnetic conductive plate in structure. The first sound generating body and the second sound generating body are symmetrically arranged with the shared magnetic conductive plate as the symmetry plane. Further, the first magnetic circuit system and the second magnetic circuit system are symmetrically arranged with respect to the shared magnetic conductive plate. The first vibration system is installed outside the first magnetic circuit system, and the second vibration system is installed outside the second magnetic circuit system. However, this solution is designed with 10 magnetic steels, and the magnetizing directions of the symmetric magnetic steels are opposite, making the assembly difficult and the process complex.

[0009] The disadvantages of the prior art are as follows:

[0010] First: In the prior art, the voice coils of the speaker are asymmetrically placed, with different heights and thicknesses, making it very difficult to achieve the same performance and amplitude on both sides, resulting in a low production yield and high cost.

[0011] Second: The two vibration systems use the same inner cavity, and the vibration system on one side is likely to affect the vibration system on the other side.

[0012] Third: The magnetic circuit system needs to place 10 magnetic steels and multiple pole pieces, with cumbersome assembly and low efficiency.

[0013] Fourth: The dual diaphragm has many parts and multiple positioning references, resulting in inconsistent references during assembly, and the tolerance accumulation causes the voice coil diaphragm to be not completely symmetric. Utility Model Content

[0014] The purpose of the present utility model is to overcome the deficiencies of the above-mentioned traditional technologies and provide a speaker.

[0015] The purpose of the present utility model is achieved through the following technical measures: A speaker, characterized in that: it includes a central support member, a magnetic circuit assembly is provided inside the central support member, an upper vibration assembly is provided above the magnetic circuit assembly, a lower vibration assembly is provided below the magnetic circuit assembly, and the upper vibration assembly and the lower vibration assembly are symmetrically arranged; the upper vibration assembly includes an upper diaphragm, an upper basin frame for fixing the upper diaphragm, an upper voice coil fixed to the upper diaphragm, an upper flexible circuit board for supporting the upper voice coil, and an upper annular pole piece and an upper central pole piece provided on the upper basin frame; the lower vibration assembly includes a lower diaphragm, a lower basin frame for fixing the lower diaphragm, a lower voice coil fixed to the lower diaphragm, a lower flexible circuit board for supporting the lower voice coil, a lower annular pole piece and a lower central pole piece provided on the lower basin frame.

[0016] As an improvement, the central support member includes a square support body, a central notch is provided in the center of the support body, and a first notch and a third notch, a second notch and a fourth notch are symmetrically provided around the central notch of the support body respectively.

[0017] As a further improvement, upper and lower grooves are provided on the support body. The position of the upper groove corresponds to that of the upper flexible circuit board, and the position of the lower groove corresponds to that of the lower flexible circuit board.

[0018] As a further improvement, the first notch, the second notch, the third notch, and the fourth notch are all open slots, that is, the side away from the central notch is open.

[0019] As a further improvement, a first support body extends upward on one side of the support body at the central notch. A second support body extends from the first support body, and a third support body extends from the second support body. The second support body is square, the first support body connecting the support body and the second support body is fan-shaped, and the third support body is a right trapezoid with the inclined side close to the central notch.

[0020] As a further improvement, the magnetic circuit assembly includes a central magnet at the central notch, a first magnet at the first notch, a second magnet at the second notch, a third magnet at the third notch, and a fourth magnet at the fourth notch.

[0021] As a further improvement, the distance from the upper end of the third support body to the upper central pole piece is greater than or equal to 0.1 mm. As a further improvement, the central support member is a magnetic conductive intermediate support member or a non-magnetic conductive intermediate support member.

[0022] Due to the adoption of the above technical solutions, compared with the prior art, the advantages of the present utility model are as follows:

[0023] First: By providing the upper diaphragm and the lower diaphragm, the effective amplitude area is increased to achieve the purpose of improving the frequency response. At the same time, the performance and amplitude consistency of the two diaphragms are ensured, the distortion of the speaker is reduced, the vibration of the whole machine is eliminated, and excellent acoustic performance and better user experience are given to the speaker;

[0024] Second: By symmetrically placing the upper voice coil and the lower voice coil, it is easy to achieve the same performance and amplitude on both sides;

[0025] Third: The central support member and the magnetic circuit assembly of the present novelty separate the upper vibration assembly and the lower vibration assembly, and the air flow does not affect each other during vibration. At the same time, the upper vibration assembly and the lower vibration assembly are the same vibration system, and the compliance and mass are exactly the same during vibration. Therefore, at each moment of vibration, the amplitudes are opposite, the displacement magnitudes are the same, the sound pressure levels are the same, and the phases are opposite;

[0026] Fourth: The structure of the present novelty is simple, the assembly is simple, the tolerance is small, the assembly efficiency is high, and it will not cause asymmetry between the voice coil and the diaphragm.

[0027] The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments. Description of the Drawings

[0028] Attached Figure 1 is a schematic structural diagram of the first embodiment of the present utility model;

[0029] Attached Figure 2 is an exploded view of the structure of the first embodiment of the present utility model;

[0030] Attached Figure 3 is a schematic structural diagram of the magnetic circuit assembly described in the first embodiment of the present utility model;

[0031] Attached Figure 4 is an exploded view of the structure of the magnetic circuit assembly described in the first embodiment of the present utility model;

[0032] Attached Figure 5 is a sectional view of the first embodiment of the present utility model;

[0033] Attached Figure 6 is Figure 5 an enlarged view of part A in the attached figure;

[0034] Attached Figure 7 is a schematic structural diagram of the magnetic circuit assembly described in the second embodiment of the present utility model;

[0035] Attached Figure 8 is a sectional view of the second embodiment of the present utility model. Specific Embodiments

[0036] The technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0037] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0038] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "setting", "connection", "fixation", "swivel connection" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral body; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. Unless otherwise clearly defined, for those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0039] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meaning of "a plurality of" is two or more, unless otherwise clearly and specifically defined.

[0040] Embodiment 1: As shown in the attached Figure 1 - attached Figure 6 As shown, a loudspeaker includes a central support member 1. A magnetic circuit assembly 2 is provided inside the central support member 1. An upper vibration assembly 3 is provided above the magnetic circuit assembly 2, and a lower vibration assembly 4 is provided below the magnetic circuit assembly 2. The upper vibration assembly 3 and the lower vibration assembly 4 are symmetrically arranged. The upper vibration assembly 3 includes an upper diaphragm 31, an upper chassis 32 for fixing the upper diaphragm 31, an upper voice coil 33 fixed to the upper diaphragm 31, an upper flexible circuit board 34 for supporting the upper voice coil 33, and an upper annular pole piece 35 and an upper central pole piece 36 provided on the upper chassis 32. The lower vibration assembly 4 includes a lower diaphragm 41, a lower chassis 42 for fixing the lower diaphragm 41, a lower voice coil 43 fixed to the lower diaphragm 41, a lower flexible circuit board 44 for supporting the lower voice coil 43, a lower annular pole piece 45 and a lower central pole piece 46 provided on the lower chassis 42. The central support member 1 and the magnetic circuit assembly 2 separate the upper vibration assembly 3 and the lower vibration assembly 4, and the airflows do not affect each other during vibration. At the same time, the upper vibration assembly 3 and the lower vibration assembly 4 are the same vibration system, and their compliance and mass are exactly the same during vibration. Therefore, at each moment of vibration, the amplitudes are opposite, the displacement magnitudes are the same, the sound pressure levels are the same, and the phases are opposite.

[0041] The central support member 1 includes a square support body 11, a central notch 12 is provided at the center of the support body 11, and a first notch 13 and a third notch 14, a second notch 15 and a fourth notch 16 are symmetrically provided around the central notch 12 of the support body 11 respectively. The first notch 13, the second notch 15, the third notch 14 and the fourth notch 16 are all open slots, that is, the side far from the central notch 12 is open; the open slots can make the most of the space, maximize the size of the placed magnet, and improve the overall performance of the speaker.

[0042] On one side of the central notch 12 of the support body 11, a first support body 111 extends upward. A second support body 112 extends on the first support body 111, and a third support body 113 extends on the second support body 112. The second support body 112 is square, which is convenient for fixing the position of the magnet; the first support body 111 connects the support body 11 and the second support body 112 and is fan-shaped, which is convenient for further fixing the magnet; the third support body 113 is a right trapezoid and the inclined side is close to the central notch 12; the setting of the right trapezoid is easy to store glue, which is convenient for the fixation of the central magnet 21 and the central support member 1 and ensures its reliability.

[0043] The magnetic circuit assembly 2 includes a central magnet 21 located in the central notch 12, a first magnet 22 located in the first notch 13, a second magnet 23 located in the second notch 15, a third magnet 24 located in the third notch 14 and a fourth magnet 25 located in the fourth notch 16; it ensures the maximization of the magnet size and improves the overall performance of the speaker.

[0044] The distance from the upper end of the third support body 113 to the upper central pole piece is greater than or equal to 0.1 mm; the setting of the distance is to ensure that the assembly does not interfere.

[0045] The central support member 1 is a magnetic conductive intermediate support member or a non-magnetic conductive intermediate support member.

[0046] The surround on the upper diaphragm 31 and the lower diaphragm 41 in this new type can be inward or outward.

[0047] Embodiment 2: As shown in the attached Figure 7 and the attached Figure 8 As shown, the structure is the same as that of Embodiment 1, the difference is that: upper grooves 114 and lower grooves 115 are provided on the support body 11, the position of the upper groove 114 corresponds to the upper flexible circuit board 34, and the position of the lower groove 115 corresponds to the lower flexible circuit board 44.

[0048] In this embodiment, in order to reduce the overall height, the central support member 1 is thinned (i.e., the upper groove 114 and the lower groove 115 are provided), and the vibrating members (voice coil and flexible circuit board) are arranged close to the upper groove 114 and the lower groove 115, so as to achieve thinning of a certain shape and reduce the overall height.

[0049] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A loudspeaker, characterized in that: It includes a central support member, in which a magnetic circuit assembly is arranged, an upper vibration assembly is arranged above the magnetic circuit assembly, and a lower vibration assembly is arranged below the magnetic circuit assembly, and the upper vibration assembly and the lower vibration assembly are symmetrically arranged; the upper vibration assembly includes an upper diaphragm, an upper basin frame for fixing the upper diaphragm, an upper voice coil fixed on the upper diaphragm, an upper flexible circuit board for supporting the upper voice coil, and an upper annular pole piece and an upper center pole piece arranged on the upper basin frame; the lower vibration assembly includes a lower diaphragm, a lower basin frame for fixing the lower diaphragm, a lower voice coil fixed on the lower diaphragm, a lower flexible circuit board for supporting the lower voice coil, and a lower annular pole piece and a lower center pole piece arranged on the lower basin frame.

2. A loudspeaker according to claim 1, characterized in that: The central support member comprises a square support body, a central notch is arranged at the center of the support body, and a first notch, a third notch, a second notch and a fourth notch are symmetrically arranged around the central notch.

3. A loudspeaker according to claim 2, characterized in that: An upper groove and a lower groove are provided on the support body. The position of the upper groove corresponds to the upper flexible circuit board, and the position of the lower groove corresponds to the lower flexible circuit board.

4. A loudspeaker according to any one of claims 2 or 3, characterized in that: The first notch, the second notch, the third notch and the fourth notch are all open notches, that is, the side away from the central notch is open.

5. A loudspeaker according to claim 4, characterized in that: The support body is located on one side of the central notch and extends upwardly to provide a first support body, a second support body is extended on the first support body, a third support body is extended on the second support body, the second support body is square, the first support body connects the support body and the second support body and is fan-shaped, and the third support body is a right-angled trapezoid and the inclined side is close to the central notch.

6. A loudspeaker according to claim 5, characterized in that: The magnetic circuit assembly includes a central magnetic steel located at the central slot, a first magnetic steel located at the first slot, a second magnetic steel located at the second slot, a third magnetic steel located at the third slot, and a fourth magnetic steel located at the fourth slot.

7. A loudspeaker according to claim 6, characterized in that: The distance between the upper end of the third support body and the upper center pole piece is greater than or equal to 0.1 mm.

8. The loudspeaker according to claim 1, characterized in that: The central support member is a magnetic conductive intermediate support member or a non-magnetic conductive intermediate support member.

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