Miniature magnetic flat panel loudspeaker

Abstract

The utility model belongs to the technical field of loudspeakers, and discloses a miniature magnetic panel loudspeaker, which comprises an upper cover and a lower cover, a magnet is fixedly mounted on the lower cover, the magnet is annular, a coil is fixedly mounted in the magnet, a vibrating diaphragm assembly is arranged above the magnet and comprises a vibrating diaphragm and a vibrating diaphragm support, and the vibrating diaphragm support is fixedly mounted on the lower cover. In the application, the diaphragm vibrates integrally, so that the segmentation vibration is greatly reduced, the diaphragm integrity is better, and more excellent high-frequency performance can be brought, therefore, the device combines the advantages of a miniature flat horn, a balanced armature horn and an electromagnetic buzzer, the structure of the horn is simplified, the cost of the horn is reduced, and the mass of the diaphragm is reduced; the segmentation vibration in the working process is reduced, and the sound performance of the loudspeaker in high frequency is greatly improved.

Description

Technical Field

[0001] This utility model belongs to the field of loudspeaker technology, specifically relating to a miniature magnetic flat panel loudspeaker. Background Technology

[0002] Currently, the mainstream miniature high-frequency loudspeakers mainly fall into several types: miniature flat panel loudspeakers and balanced armature loudspeakers, etc.

[0003] The working principle of miniature flat-panel loudspeakers (e.g., CN202210501890.9 published by the Chinese Patent Office on 2022-08-12) is similar to that of moving-coil loudspeakers. They primarily use alternating current signals to change the direction of the current in the coil, causing the coil to reciprocate in a permanent magnetic field, thereby driving the diaphragm to produce sound. Miniature flat-panel loudspeakers improve upon the coil design of moving-coil loudspeakers, reducing split vibrations. However, because the coil is still fixed to the diaphragm, the diaphragm's weight is relatively large, resulting in poor high-frequency performance. Balanced armature loudspeakers (e.g., CN202311027875.6 published by the Chinese Patent Office on 2024-02-23) use a fixed coil to magnetize the armature, causing the armature to reciprocate in a permanent magnetic field. This drives a mechanical connecting rod to push the diaphragm to produce sound. Due to its special armature structure, the balanced armature loudspeaker requires a mechanical connecting rod to drive the miniature diaphragm, resulting in a complex structure, difficult assembly, high production costs, poor stability, and a tendency to produce nonlinear distortion. Electromagnetic buzzers (such as CN200820000717.6 published by the Chinese Patent Office on 2008-12-17) magnetize the iron core when energized, which in turn drives a magnet plate fixed on the diaphragm to produce sound. However, the diaphragm is heavy, inefficient, and has high distortion.

[0004] For miniature tweeters, the rigidity and mass of the diaphragm itself have a significant impact on high-frequency performance, and the breakup vibrations generated by the diaphragm during movement also affect high-frequency performance. To achieve excellent high-frequency performance, it is necessary to minimize the mass of the diaphragm as much as possible, and also to minimize the breakup vibrations generated by the diaphragm during movement. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, the purpose of this utility model is to provide a miniature magnetic flat panel loudspeaker to solve the problems mentioned in the background art.

[0006] The technical solution adopted by this miniature magnetic flat panel loudspeaker to solve its technical problems is as follows:

[0007] A miniature magnetic flat panel loudspeaker is provided, including an upper cover and a lower cover. A magnet is fixedly installed on the lower cover. The magnet is ring-shaped and a coil is fixedly installed inside the magnet. A diaphragm assembly is provided above the magnet. The diaphragm assembly includes a diaphragm and a diaphragm support. The diaphragm is fixed on the diaphragm support, and the diaphragm support is fixed inside the upper cover and the lower cover.

[0008] Furthermore, the diaphragm is a high magnetic permeability thin film, and the material of the high magnetic permeability thin film is preferably permalloy, also known as iron-nickel alloy.

[0009] Furthermore, a PCB is provided on the rear side of the assembled upper and lower covers, and the coil leads pass through the assembled upper and lower covers and are connected to the PCB.

[0010] Furthermore, the diaphragm is provided with a folded ring.

[0011] Furthermore, the sound outlet is fixedly installed on the front side of the assembled upper and lower covers.

[0012] Furthermore, the upper cover contains coils and magnets arranged in the same direction, with the diaphragm assembly located between the magnets and coils on both sides.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. This utility model exemplifies a miniature magnetic flat-panel loudspeaker. The purpose of this invention is to design a novel miniature magnetic flat-panel loudspeaker that utilizes the principle of a balanced armature loudspeaker, possessing excellent high-frequency performance and a very small size, while also exhibiting the smaller breakover vibration, excellent sound pressure level, and low distortion of a flat-panel loudspeaker. Based on the optimized working principles of balanced armature loudspeakers, miniature flat-panel loudspeakers, and electromagnetic buzzers, this design utilizes an internal magnet that provides a constant bias magnetic field. When current passes through the coil, a magnetic field is generated. When this alternating magnetic field is positively superimposed on the constant magnetic field generated by the magnet, the magnetic force attracts the diaphragm to bend towards the coil, causing diaphragm deformation. When they are negatively superimposed, the magnetic force is canceled out, the diaphragm is not attracted, and returns to its center position. When the current is disconnected, the diaphragm is no longer affected by the magnetic field generated by the coil and returns to its initial state. The sound is produced by the combined action of the iron and the diaphragm. Compared to the miniature flat panel speaker diaphragm with a voice coil fixed on it, the balanced armature speaker diaphragm with a drive rod fixed on it, and the electromagnetic buzzer diaphragm with a magnet plate fixed on it, the diaphragm of this application has no other components. Therefore, the diaphragm is lighter. Moreover, compared to the miniature flat panel speaker diaphragm driven by a voice coil, the balanced armature speaker diaphragm diaphragm driven by a drive rod, and the electromagnetic buzzer diaphragm diaphragm driven by a magnet plate, the diaphragm of this application vibrates as a whole. This method greatly reduces the breakup vibration, and the diaphragm has better integrity, which can bring better high-frequency performance. Therefore, this device combines the advantages of miniature flat panel speakers, balanced armature speakers, and electromagnetic buzzers, simplifies the speaker structure, reduces the speaker cost, reduces the mass of the diaphragm, reduces the breakup vibration during operation, and greatly improves the high-frequency sound performance of this speaker.

[0015] 2. In this utility model example, a miniature magnetic flat panel loudspeaker features a folded ring. One method uses non-magnetic materials such as PU / PET / PEEK as suspension edges, which are installed and bonded around the diaphragm. Another method uses a thin iron-nickel alloy film integrally stamped. In this case, the diaphragm and the folded ring are integrated. When the coil is energized, the magnetic diaphragm experiences more force at the center, while the surrounding area experiences less force and smaller amplitude due to the fixation of the diaphragm support. By using the folded ring, the amplitude can be increased, efficiency can be improved, and the problem of less force at the surrounding area can be alleviated. After installing the folded ring, the area without the folded ring in the center can vibrate more uniformly.

[0016] 3. The miniature magnetic flat panel loudspeaker of this utility model can improve the sound output effect by setting the sound outlet 9.

[0017] 4. In this example of a miniature magnetic flat panel loudspeaker, the presence of a permanent magnet causes the diaphragm to be slightly close to the magnet in the initial state, resulting in less force and slightly lower efficiency during operation. The alternating magnetic field and the constant magnetic field generated by the magnet are superimposed, which may be positive or negative. Positive superposition will enhance the magnetic force and attract the diaphragm towards the magnet; negative superposition will cancel the original magnetic field, causing the diaphragm to be free from magnetic force and return to its original position. The presence of the magnet itself provides a constant bias magnetic field, making the diaphragm easier to drive by the coil. However, the disadvantage is that the diaphragm will be attracted by the magnet when the coil is not energized. Therefore, the approach of installing coils and magnets on both sides can better drive the diaphragm, and the diaphragm will not be attracted by the magnet when it is not working. Therefore, the dual-magnet dual-coil scheme is adopted. In the initial state, the diaphragm assembly will hardly deform due to the attraction of the permanent magnets on both sides, and will also return to the initial position more quickly when the current is cut off. Attached Figure Description

[0018] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0019] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present invention;

[0020] Figure 2 This is a structural schematic diagram of Embodiment 2 of the present invention;

[0021] Figure 3 This is a structural schematic diagram of Embodiment 3 of this utility model;

[0022] Figure 4 This is a structural schematic diagram of Embodiment 4 of this utility model.

[0023] In the diagram: 1. Top cover; 2. Bottom cover; 3. Magnet; 4. Coil; 5. Diaphragm; 6. Diaphragm support; 7. PCB; 8. Surround; 9. Nozzle. Detailed Implementation

[0024] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] Example 1

[0027] like Figure 1 As shown, this embodiment provides a miniature magnetic flat panel loudspeaker, including an upper cover 1 and a lower cover 2. A magnet 3 is fixedly installed on the lower cover 2. The magnet 3 is ring-shaped, and a coil 4 is fixedly installed inside the magnet 3. A diaphragm assembly is provided above the magnet 3. The diaphragm assembly includes a diaphragm 5 and a diaphragm support 6. The diaphragm 5 is fixed on the diaphragm support 6, and the diaphragm support 6 is fixed inside the upper cover 1 and the lower cover 2. The upper cover 1 is provided with a sound outlet.

[0028] In this embodiment, the diaphragm 5 is a high magnetic permeability thin film, and the material of the high magnetic permeability thin film is preferably permalloy, also known as iron-nickel alloy.

[0029] In this embodiment, a PCB7 is provided on the rear side of the assembled upper cover 1 and lower cover 2, and the lead wire of the coil 4 passes through the assembled upper cover 1 and lower cover 2 and is connected to the PCB7.

[0030] The purpose of this invention is to design a novel miniature magnetic flat-panel speaker that utilizes the principle of a balanced armature speaker, possessing excellent high-frequency performance and a very small size, while also exhibiting the smaller breakover vibration, excellent sound pressure level, and low distortion of a flat-panel speaker. Based on the optimized working principles of balanced armature speakers, miniature flat-panel speakers, and electromagnetic buzzers, this design incorporates a magnet 3 that provides a constant bias magnetic field. When current flows through coil 4, a magnetic field is generated. When this alternating magnetic field is positively superimposed on the constant magnetic field generated by the magnet, the magnetic force attracts the diaphragm towards the coil, causing diaphragm deformation. When the magnetic force is negatively superimposed, it is canceled out, and the diaphragm is no longer attracted, returning to its center position. When the current is disconnected, the diaphragm is no longer affected by the magnetic field generated by the coil and returns to its initial state. This is achieved through the combined action of coil 4, magnet 3, and diaphragm 5. In terms of sound production, compared to the miniature flat panel speaker diaphragm with a voice coil fixed on it, the balanced armature speaker diaphragm with a drive rod fixed on it, and the electromagnetic buzzer diaphragm with a magnet plate fixed on it, the diaphragm 5 of this application has no other components, so the diaphragm is lighter. Moreover, compared to the miniature flat panel speaker where the diaphragm is driven by a voice coil, the balanced armature speaker where the diaphragm is driven by a drive rod, and the electromagnetic buzzer where the diaphragm is driven by a magnet plate, the diaphragm 5 of this application vibrates as a whole. This method greatly reduces the segmentation vibration, and the diaphragm has better integrity, which can bring better high-frequency performance. Therefore, this device combines the advantages of miniature flat panel speakers, balanced armature speakers, and electromagnetic buzzers, simplifies the speaker structure, reduces the cost of the speaker, reduces the mass of the diaphragm, reduces the segmentation vibration during operation, and greatly improves the sound performance of this speaker in the high frequency range.

[0031] Example 2

[0032] The features that are the same as those in Embodiment 1 will not be repeated here. The features that differ from those in Embodiment 1 are as follows:

[0033] In this embodiment, the diaphragm 5 is provided with a folded ring 8.

[0034] In this embodiment, the folded ring 8 can be configured in two ways: one is to use non-magnetic materials such as PU / PET / PEEK as suspension edges, which are then installed and bonded around the diaphragm; the other is to use a thin iron-nickel alloy film that is integrally stamped. In this case, the diaphragm and the folded ring are integrally set. When the coil is energized, the magnetic diaphragm experiences more force at the center, while the surrounding area experiences less force and smaller amplitude due to the fixation of the diaphragm support. By setting the folded ring, the amplitude can be increased, efficiency can be improved, and the problem of less force at the surrounding area can be alleviated. After installing the folded ring, the area without the folded ring in the center can vibrate more uniformly.

[0035] Example 3

[0036] The features that are the same as those in Embodiment 2 will not be repeated here. The features that differ from those in Embodiment 2 are as follows:

[0037] In this embodiment, the sound outlet 9 is fixedly installed on the front side of the assembled upper cover 1 and lower cover 2.

[0038] In this embodiment, by setting the sound output nozzle 9, the sound output effect can be improved.

[0039] Example 4

[0040] The features that are the same as those in Embodiment 3 will not be repeated here. The features that differ from those in Embodiment 3 are as follows:

[0041] In this embodiment, the upper cover 1 has a coil 4 and a magnet 3 arranged in the same direction, and the diaphragm assembly is located between the magnet 3 and the coil 4 on both sides.

[0042] The presence of permanent magnets causes the diaphragm 5 to be slightly close to the magnet in the initial state, and the force is smaller and the efficiency is slightly lower in the working state. The alternating magnetic field and the constant magnetic field generated by the magnet are superimposed, which may be positive or negative. Positive superposition will superimpose the magnetic field, enhance the magnetic force, and attract the diaphragm towards the magnet. Negative superposition will cancel the original magnetic field, causing the diaphragm to be unaffected by the magnetic force and return to its original position. The presence of the magnet itself provides a constant bias magnetic field, making the diaphragm easier to drive by the coil. However, the disadvantage is that the diaphragm will be attracted by the magnet when the coil is not energized. Therefore, the approach of installing coils and magnets on both sides can drive the diaphragm better, and the diaphragm will not be attracted by the magnet when it is not working. Therefore, this embodiment adopts a double magnet and double coil scheme. The diaphragm assembly will hardly deform in the initial state due to the attraction of the permanent magnets on both sides, and will also return to the initial position more quickly at the moment the current is cut off.

[0043] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

[0044] Apart from the technical features described in the specification, the other technical features are known to those skilled in the art. To highlight the innovative features of this utility model, the other technical features will not be described in detail here.

Claims

1. A micro magnetic flat panel loudspeaker comprising an upper cover (1) and a lower cover (2), characterized in that, The lower cover (2) is fixedly installed with a magnet (3), the magnet (3) is annular, the magnet (3) is fixedly installed with a coil (4) inside, the upper side of the magnet (3) is provided with a diaphragm assembly, the diaphragm assembly comprises a diaphragm (5) and a diaphragm support (6), the diaphragm (5) is fixed on the diaphragm support (6), the diaphragm support (6) is fixed inside the upper cover (1) and the lower cover (2), and the upper cover (1) is provided with a sound outlet.

2. A micro magnetic flat panel loudspeaker according to claim 1, wherein, The diaphragm (5) is a high-permeability thin film, and the material of the high-permeability thin film is preferably permalloy, also known as iron-nickel alloy.

3. A micro magnetic flat panel loudspeaker according to claim 1, wherein, The rear side of the upper cover (1) and the lower cover (2) is provided with a PCB (7), and the lead wire of the coil (4) is connected to the PCB (7) through the assembled upper cover (1) and lower cover (2).

4. A micro magnetic flat panel loudspeaker according to claim 1, wherein, The diaphragm (5) is provided with a folded ring (8).

5. A micro magnetic flat panel loudspeaker according to claim 1, wherein, The front side of the upper cover (1) and the lower cover (2) is fixedly installed with a sound outlet nozzle (9), and the sound outlet nozzle (9) is located on the side of the sound outlet.

6. A micro magnetic flat panel loudspeaker according to claim 1, wherein, The upper cover (1) is provided with the coil (4) and the magnet (3) in the same direction, and the diaphragm assembly is located between the magnets (3) and the coil (4) on both sides.

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