Plane horn

Abstract

The utility model discloses a planar loudspeaker, which belongs to the technical field of loudspeakers and comprises a plastic basin stand, an outer magnet arranged in the plastic basin stand, an inner magnet arranged in the outer magnet, a metal bonding pad arranged on the plastic basin stand, a diaphragm arranged at a step groove at the upper end of the plastic basin stand, a voice coil arranged on the diaphragm, a front cover arranged at the top of the plastic basin stand, and a sound hole arranged on the front cover. According to the utility model, the problem that the performance is reduced by at least 50% along with the reduction of the thickness size of the conventional loudspeaker, especially when the thickness size is reduced to below 2mm, can be solved. The outer magnet, the inner magnet, the diaphragm and the voice coil are all of plane structures, more height space is saved, the thickness of the loudspeaker can be made to be smaller than 1 mm, the diaphragm is placed in the plastic basin stand, the height direction position is positioned through the steps of the plastic basin stand, the front cover is placed above the diaphragm, on one hand, the diaphragm is protected from being extruded and deformed by external force, and on the other hand, the loudspeaker is more compact. On one hand, a diaphragm resonance front cavity is formed, and the sensitivity of a frequency response curve of 6k-12khz can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of loudspeakers, in particular to a flat loudspeaker. Background Art

[0002] Speakers are divided into several different types of musical instruments. One is a wind instrument, thin at the top and thick at the bottom, mostly made of copper; the other is a modern electro-acoustic component, which converts electrical signals into sound, also called a speaker. As headphone products become more and more miniaturized, the requirements for headphone speakers are getting smaller and thinner.

[0003] As the thickness of traditional speakers decreases, especially when it drops below 2 mm, the performance also decreases by at least 50%. Therefore, traditional speakers can no longer meet the demand for miniaturized speakers. Utility Model Content

[0004] The purpose of the utility model is to provide a planar speaker which can solve the problems in the prior art.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A flat speaker comprises a plastic frame, an outer magnet is arranged on the inner side of the plastic frame, an inner magnet is arranged on the inner side of the outer magnet, wherein the magnetic properties of the outer magnet and the inner magnet are opposite, a metal pad is arranged on the plastic frame, a diaphragm is arranged at the step groove at the upper end of the plastic frame, a voice coil is arranged on the diaphragm, and the voice coil is located above the outer magnet, a front cover is arranged on the top of the plastic frame, and a sound outlet is arranged on the front cover.

[0007] Preferably, the external magnet and the metal pad are integrally molded with the plastic basin frame through an injection molding process.

[0008] Preferably, the metal pad is made of copper or stainless steel plated with copper, nickel or gold, wherein the metal pad is used for welding the voice coil wire and the external electronic wire.

[0009] Preferably, the outer magnet and the inner magnet are both permanent magnets, and the magnetism of the outer magnet and the inner magnet does not degenerate after magnetization, wherein the outer magnet and the inner magnet have the same height, and the inner diameter of the outer magnet is the same as the outer diameter of the inner magnet.

[0010] Preferably, the voice coil is in a flat annular structure, and the material of the voice coil is one of copper, aluminum, and copper-clad aluminum.

[0011] Preferably, the diaphragm comprises a supporting outer ring, a substrate and a spherical top, the supporting outer ring is arranged at the step groove at the upper end of the plastic basin frame, the supporting outer ring is provided with a substrate, and the spherical top is provided on the substrate.

[0012] Preferably, a mounting hole is provided at the bottom of the plastic basin frame, and a washer is arranged in the mounting hole, wherein the washer is made of magnetic conductive material.

[0013] Preferably, the outer magnet and the inner magnet are arranged on one side or both sides of the diaphragm.

[0014] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0015] The outer magnet, inner magnet, diaphragm and voice coil of the utility model are all planar structures, which saves height space and makes the speaker thinner to 1mm. The magnet is composed of a double magnetic circuit of an outer magnet and an inner magnet. The outer magnet and the inner magnet have opposite magnetic properties. The outer magnet is embedded in the plastic basin frame, that is, when the plastic basin frame is injection molded, it is injection molded together with the outer magnet. The plastic basin frame also includes two metal pads. The voice coil is bonded to the flat position of the ball top, and the diaphragm is placed in the plastic basin frame. The height direction position is positioned by the steps of the plastic basin frame, so that the voice coil has a gap of at least 0.05mm from the outer magnet below. A front cover is placed above the diaphragm. On the one hand, it protects the diaphragm from being squeezed and deformed by external force, and on the other hand, it forms a diaphragm resonance front cavity, which can improve the sensitivity of the frequency response curve of 6k-12khz. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 An exploded view of the flat speaker of the first embodiment of the utility model;

[0017] Figure 2 This is an exploded view of the flat speaker of the first embodiment of the present utility model;

[0018] Figure 3 It is a top view schematic diagram of the planar speaker of the first embodiment of the utility model;

[0019] Figure 4 This is a schematic diagram of the upward view of the flat speaker of the first embodiment of the utility model;

[0020] Figure 5 It is a structural schematic diagram of the diaphragm of the utility model;

[0021] Figure 6 This is an exploded view of the flat speaker of the second embodiment of the utility model;

[0022] Figure 7 It is a top view schematic diagram of the planar speaker of the second embodiment of the utility model;

[0023] Figure 8 This is a schematic diagram of the upward view of the planar speaker of the second embodiment of the utility model.

[0024] In the figure: 1. Plastic basin frame; 2. External magnet; 3. Internal magnet; 4. Metal pad; 5. Diaphragm; 51. Support outer ring; 52. Base material; 53. Dome; 6. Voice coil; 7. Front cover; 71. Sound outlet; 8. Washer. DETAILED DESCRIPTION

[0025] 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 in 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.

[0026] In order to solve the technical problem that the thickness of existing speakers is reduced, especially when it is reduced to less than 2mm, the performance is also reduced by at least 50%. Therefore, traditional speakers can no longer meet the needs of miniaturized speakers. Please refer to Figure 1-Figure 8 , this embodiment provides the following technical solutions:

[0027] Embodiment 1

[0028] A flat speaker comprises a plastic basin frame 1, an outer magnet 2 is arranged inside the plastic basin frame 1, an inner magnet 3 is arranged inside the outer magnet 2, wherein the outer magnet 2 and the inner magnet 3 have opposite magnetic properties.

[0029] There may or may not be a gap between the outer magnet 2 and the inner magnet 3 .

[0030] It should be noted that the inner magnet 3 and the plastic basin frame 1 can be assembled and positioned by the inner diameter of the outer magnet 2. Glue is applied to the bottom of the plastic basin frame 1, and then the inner magnet 3 is directly placed into the outer magnet 2, which makes the assembly easier.

[0031] In this embodiment, both the outer magnet 2 and the inner magnet 3 are permanent magnets. The magnetism of the outer magnet 2 and the inner magnet 3 does not degenerate after magnetization. For a micro speaker, a neodymium iron boron magnet can be selected.

[0032] The outer magnet 2 and the inner magnet 3 have the same height, and the inner diameter of the outer magnet 2 and the outer diameter of the inner magnet 3 are the same.

[0033] It should be noted that the outer magnet 2 is an annular structure. After the outer magnet 2 and the plastic basin frame 1 are injection-molded together, the middle of the outer magnet 2 is hollow for accommodating the inner magnet 3 .

[0034] It should be noted that the magnetic circuit system of the speaker is composed of an outer magnet 2 and an inner magnet 3, that is, N (S) is on the outer magnet 2, and S (N) is on the inner magnet 3. The voice coil 6 vibrates up and down due to the magnetic lines of force from N to S on the magnetic circuit. Since the voice coil 6 is a flat structure and is located above the magnetic circuit, the voice coil lines are all placed in the magnetic field and are affected by the magnetic field force. There is a gap of at least 0.05 mm between the magnetic circuit and the voice coil 6 to ensure that the diaphragm 5 has sufficient vibration space.

[0035] It should be noted that the magnet and basin frame of a traditional speaker are separated and bonded together with glue. For a flat speaker, the flatness requirement for the outer magnet 2 and the inner magnet 3 after being placed on the plastic basin frame 1 is extremely high. A slight tilt will affect the vibration of the voice coil 6. The traditional glue bonding has the problem of uneven glue thickness on the one hand, and the risk of the magnet falling off on the other hand. However, the basin frame structure wraps the outer magnet 2 during injection molding. On the one hand, the flatness of the outer magnet 2 in the plastic basin frame 1 can be guaranteed, and on the other hand, the outer magnet 2 does not need to be bonded with glue, the process is simpler, and the risk of the outer magnet 2 falling off is also avoided.

[0036] It should be noted that the upper and lower parts of the external magnet 2 are both wrapped by the plastic basin frame 1, wherein the upper part of the external magnet 2 can be wrapped only partially to form a step, which is used to place the diaphragm 5 on the one hand and serve as a vibration space for the voice coil 6 on the other hand, thereby reducing the thickness of the speaker, wherein the bottom of the plastic basin frame 1 wraps the external magnet 2 so as to completely wrap the external magnet 2.

[0037] A metal pad 4 is disposed on the plastic basin frame 1 .

[0038] It should be noted that the metal pad 4 is composed of two parts, a large head and a small head. The two parts have different welding functions. One part of the large head is embedded in the plastic basin frame 1, and the other part is exposed for welding the voice coil wire. The small head is completely exposed and is used to connect the external electronic wire to the signal source.

[0039] In this embodiment, the external magnet 2 and the metal pad 4 are integrally molded with the plastic basin frame 1 through an injection molding process.

[0040] In this embodiment, the metal pad 4 is made of copper or stainless steel plated with copper, nickel or gold, wherein the metal pad 4 is used for welding the voice coil wire and the external electronic wire.

[0041] It should be noted that, in order to save thickness, traditional speakers often attach the PCB to the side, so the voice coil wire must be led out to at least twice the length of the embedded pad, and then welded to the PCB through an arc, wherein the PCB is glued to the side of the speaker, the assembly process is complicated, and the PCB is also prone to deflection and falling off. The voice coil wire is long and it is easy to get hung up, causing the risk of no sound. Since the speaker is very thin, the thinnest is only 1mm, the PCB pad is required to be very small. If the voice coil wire is welded and then an external signal line is connected, the voice coil wire is easily burned off by high temperature, causing no sound. The flat speaker adopts an embedded pad design, and the metal pad 4 and the plastic basin frame 1 are made into an integrated structure by injection molding. There is no need to bond the metal pad 4 separately, and the assembly process is simpler. The metal pad 4 is close to the voice coil 6, which is convenient for welding and avoiding the phenomenon of no sound. The metal pad 4 is divided into a large head and a small head, which is convenient for separately welding the voice coil wire and the external signal line.

[0042] A diaphragm 5 is provided at the step groove at the upper end of the plastic basin frame 1 .

[0043] In this embodiment, the outer magnet 2 and the inner magnet 3 are arranged on one side or both sides of the diaphragm 5 .

[0044] It should be noted that a magnetic circuit consisting of an external magnet 2 and an internal magnet 3 is added to one side of the diaphragm 5, or a magnetic circuit consisting of an external magnet 2 and an internal magnet 3 is added to the upper and lower surfaces of the diaphragm 5. In this way, the magnetic field effect on the voice coil 6 is doubled, and the sensitivity of the speaker is increased by 3dB.

[0045] In this embodiment, the diaphragm 5 includes a supporting outer ring 51 , a substrate 52 and a spherical top 53 . The supporting outer ring 51 is arranged at the step groove at the upper end of the plastic basin frame 1 , the substrate 52 is arranged on the supporting outer ring 51 , and the spherical top 53 is arranged on the substrate 52 .

[0046] It should be noted that the dome 53 is a planar structure made of a rigid material, which serves to enhance the rigidity of the diaphragm 5 . The substrate 52 is an elastic material, and the substrate 52 can be a planar structure or a structure with a support ring.

[0047] A voice coil 6 is disposed on the diaphragm 5 , and the voice coil 6 is located above the external magnet 2 .

[0048] It should be noted that the voice coil 6 can be placed on both sides of the diaphragm 5 to form a single-diaphragm dual-voice coil structure. According to the speaker driving force F=BIL, L is the number of voice coil turns. The dual voice coil has twice the number of turns, that is, the driving force is twice as large, so the sensitivity of the dual voice coil speaker will be 3dB higher.

[0049] In the present embodiment, the voice coil 6 is in a flat ring structure, and the material of the voice coil 6 is one of copper, aluminum, and copper-clad aluminum.

[0050] A front cover 7 is disposed on the top of the plastic basin frame 1 , and a sound outlet hole 71 is disposed on the front cover 7 .

[0051] It should be noted that the front cover 7 plays a role in protecting the diaphragm 5. The front cover 7 and the diaphragm 5 form a front cavity, which improves the sensitivity of 6k-12k. The sound outlet hole 71 opened on the surface of the front cover 7 facilitates the speaker to make sound.

[0052] Embodiment 2

[0053] Compared with the first embodiment, the bottom of the plastic basin frame 1 wraps around the outer magnet 2 , and may only wrap around a portion of the outer magnet 2 .

[0054] A mounting hole is provided at the bottom of the plastic basin frame 1 , and a washer 8 is arranged in the mounting hole. The washer 8 is made of a magnetic conductive material.

[0055] It should be noted that in order to improve the magnetic conductivity of the outer magnet 2 and the inner magnet 3, a washer 8 can be added to the bottom of the plastic basin frame 1, wherein a mounting hole can be opened at the bottom of the plastic basin frame 1, and the outer magnet 2 does not need to be completely wrapped. A washer 8 is set in the mounting hole. In this way, the efficiency of the outer magnet 2 and the inner magnet 3 can be improved by 30%, and the speaker sensitivity can be improved by 3dB.

[0056] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0057] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A flat speaker, comprising a plastic frame (1), characterized in that: An external magnet (2) is arranged on the inner side of the plastic frame (1), and an internal magnet (3) is arranged on the inner side of the external magnet (2), wherein the magnetic properties of the external magnet (2) and the internal magnet (3) are opposite. A metal pad (4) is arranged on the plastic frame (1), and a diaphragm (5) is arranged at the step groove at the upper end of the plastic frame (1). A voice coil (6) is arranged on the diaphragm (5), and the voice coil (6) is located above the external magnet (2). A front cover (7) is arranged on the top of the plastic frame (1), and a sound outlet hole (71) is arranged on the front cover (7).

2. A planar speaker according to claim 1, characterized in that: The external magnet (2) and the metal pad (4) are integrally molded with the plastic basin frame (1) through an injection molding process.

3. A planar speaker according to claim 2, characterized in that: The metal pad (4) is made of copper or stainless steel plated with copper, nickel or gold, wherein the metal pad (4) is used for welding the voice coil wire and the external electronic wire.

4. A planar speaker according to claim 3, characterized in that: The outer magnet (2) and the inner magnet (3) are both permanent magnets, and the magnetism of the outer magnet (2) and the inner magnet (3) does not degenerate after magnetization, wherein the height of the outer magnet (2) and the inner magnet (3) are the same, and the inner diameter of the outer magnet (2) is the same as the outer diameter of the inner magnet (3).

5. A planar speaker according to claim 4, characterized in that: The voice coil (6) is in a flat annular structure, and the material of the voice coil (6) is one of copper, aluminum, and copper-clad aluminum.

6. A planar speaker according to claim 5, characterized in that: The diaphragm (5) comprises a supporting outer ring (51), a substrate (52) and a spherical top (53); the supporting outer ring (51) is arranged at a step groove at the upper end of the plastic basin frame (1); the substrate (52) is arranged on the supporting outer ring (51); and the spherical top (53) is arranged on the substrate (52).

7. A planar speaker according to claim 6, characterized in that: The bottom of the plastic basin frame (1) is provided with a mounting hole, in which a washer is arranged, wherein the washer is made of a magnetic conductive material.

8. A planar speaker according to claim 7, characterized in that: The outer magnet (2) and the inner magnet (3) are arranged on one side or both sides of the diaphragm (5).

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