Plane horn structure

Abstract

The utility model discloses a plane horn structure which comprises a plastic basin stand, the inner side of the plastic basin stand is provided with a step, the step, the bottom of the plastic basin stand and the side wall of the plastic basin stand form an accommodating cavity used for wrapping the edge of a lower outer magnet, and the center of the lower outer magnet is provided with a lower inner magnet. The objective of the utility model is to solve the problem that a conventional loudspeaker PCB falls off and is noiseless. The plane type upper and lower magnets, the voice coil and the diaphragm are adopted, the height space is saved, the integrated embedded bonding pad is welded through injection molding, a PCB is omitted, voice coil wire welding is facilitated, the length of the voice coil wire is reduced, the soundless risk is avoided, the lower outer magnet is wrapped by the inner positioning of the plastic basin frame, the lower outer magnet does not need to be bonded through glue, and the manufacturing cost is reduced. And the lower outer magnet is also prevented from falling off.

Description

Technical Field

[0001] This utility model relates to the field of loudspeaker technology, specifically a planar loudspeaker structure. Background Technology

[0002] As headphone products become increasingly miniaturized, the requirements for headphone speakers are becoming smaller and thinner. The thickness of traditional speakers is decreasing, especially below 2mm, but performance drops by at least 50%. Therefore, traditional speakers can no longer meet the demands of miniaturized speakers, and their structural design has the following drawbacks:

[0003] 1. In traditional speaker systems, the magnet and frame are separate components, glued together. For planar magnetic speakers, the flatness of the magnet after placement on the frame is extremely critical; even slight tilting can affect the voice coil vibration. Traditional glue bonding suffers from uneven glue thickness and the risk of the magnet detaching.

[0004] 2. Traditional planar loudspeakers, in order to save on thickness, often have the PCB mounted on the side. This requires the voice coil wire to extend at least twice the length of the embedded pad, and then be soldered onto the PCB after a curved path. The disadvantages are as follows:

[0005] (1) The PCB is glued to the side of the speaker, the assembly process is complicated, and the PCB is also easy to deviate and fall off.

[0006] (2) The voice coil wire is relatively long and is easy to break, which may cause no sound.

[0007] (3) Because the speaker is very thin, with the thinnest being only 1mm, the PCB pads need to be very small. If the voice coil wire is soldered and then an external signal wire is connected, the voice coil wire is easily burned off by the high temperature, resulting in no sound. Utility Model Content

[0008] The purpose of this invention is to provide a planar speaker structure, which uses an injection-molded embedded pad to eliminate the need for a PCB, reduce the length of the voice coil wire, and avoid the risk of no sound. The lower outer magnet is wrapped in the inner positioning of the plastic frame, so the lower outer magnet does not need to be glued, making the process simpler and avoiding the risk of the lower outer magnet falling off, thus solving the problems in the prior art.

[0009] To achieve the above objectives, this utility model provides the following technical solution:

[0010] A planar speaker structure includes a plastic basin frame, the inner side of which is provided with a step, the step, the bottom of the plastic basin frame and the side wall of the plastic basin frame forming a receiving cavity for enclosing the edge of a lower outer magnet, and a lower inner magnet is provided in the center of the lower outer magnet.

[0011] Furthermore, a diaphragm is provided on the step, a voice coil is provided at the bottom of the diaphragm, an upper outer magnet and an upper inner magnet located at the center of the upper outer magnet are provided above the voice coil, and the top of the upper outer magnet is sealed by an upper cover.

[0012] Furthermore, both the upper inner magnet and the upper cover have sound outlet holes at their centers.

[0013] Furthermore, the plastic basin frame has a protrusion formed on its side, and two solder pads are embedded in the protrusion.

[0014] Furthermore, the pad consists of a large head and a small head, with the large head connected to the voice coil via a wire and the small head connected to an external electronic wire.

[0015] Furthermore, the top of the lower outer magnet has a voice coil vibration space.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] 1. The upper and lower magnets, voice coil and diaphragm of this utility model are all planar structures, which saves more height space. The speaker thickness can be made as thin as 1mm. It adopts injection molding and welding of an embedded pad, eliminating the need for PCB, which facilitates the soldering of voice coil wires, reduces the length of voice coil wires and avoids the risk of no sound.

[0018] 2. Due to the repulsive force between the upper and lower magnetic circuits, this injection-molded structure uses the inner positioning of the plastic basin frame to wrap the lower outer magnet. The lower outer magnet does not need to be glued, making the process simpler. It also avoids the risk of the lower outer magnet falling off, making the assembly process simpler, the product consistency and efficiency higher, and the height control of the upper and lower magnetic circuits more precise. Attached Figure Description

[0019] Figure 1 This is a top view of the assembly of this utility model;

[0020] Figure 2 This utility model Figure 1 Assembly drawing with the bottom facing up;

[0021] Figure 3 This utility model Figure 1 A structural decomposition diagram;

[0022] Figure 4 This is a schematic diagram of the assembly of the lower outer magnet and the plastic basin frame of this utility model;

[0023] Figure 5 This utility model Figure 1 Overall sectional view;

[0024] Figure 6 This utility model Figure 4 A sectional view.

[0025] In the diagram: 1. Plastic basket frame; 2. Solder pad; 3. Step; 4. Lower outer magnet; 5. Lower inner magnet; 6. Diaphragm; 7. Voice coil; 8. Upper outer magnet; 9. Upper inner magnet; 10. Top cover; 11. Boss. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figure 1-6 A planar speaker structure includes a plastic basin frame 1, which is integrally injection molded with a lower outer magnet 4 and a solder pad 2. A step 3 is provided on the inner side of the plastic basin frame 1, forming a cavity with the bottom and sidewall of the plastic basin frame 1 to enclose the edge of the lower outer magnet 4. A lower inner magnet 5 is located in the center of the lower outer magnet 4. The lower outer magnet 4 has a ring structure; after being integrally injection molded with the plastic basin frame 1, the center of the lower outer magnet 4 is hollow, used to place the lower inner magnet 5. The assembly of the lower inner magnet 5 and the plastic basin frame 1 can be positioned by the inner diameter of the lower outer magnet 4. Adhesive is applied to the bottom of the plastic basin frame 1, and then the lower inner magnet 5 is directly placed into the center of the lower outer magnet 4 (see [reference]). Figure 4 This makes assembly simpler. The top of the lower outer magnet 4 has a vibration space for the voice coil 7, and the height of the step 3 also provides a vibration space for the voice coil 7, which can reduce the thickness of the speaker.

[0028] The plastic basin frame 1 has a structure in which the lower outer magnet 4 is wrapped during injection molding. This ensures the flatness of the lower outer magnet 4 within the basin frame and eliminates the need for glue to bond the lower outer magnet 4, simplifying the process and preventing the magnet from falling off.

[0029] Specifically, the lower outer magnet 4 is enclosed by a frame at both the top and bottom. The upper part of the lower outer magnet 4 may only be partially enclosed, forming a step 3. This step serves two purposes: firstly, it houses the diaphragm 6, and secondly, it provides a vibration space for the voice coil 7 (see [link to relevant documentation]). Figure 6 (P represents the vibration space of the voice coil 7), which reduces the thickness of the speaker. The bottom of the plastic frame 1 completely encloses the lower outer magnet 4.

[0030] A diaphragm 6 is installed on step 3. The diaphragm 6 consists of a supporting outer ring, a substrate, and a dome. The dome is a planar structure made of a rigid material, which enhances the rigidity of the diaphragm. The substrate is made of an elastic material and can be a planar structure or a structure with a supporting ring. A voice coil 7 is installed at the bottom of the diaphragm 6. The voice coil 7 has a gap of at least 0.05 mm between it and the lower outer magnet 4 and the lower inner magnet 5 to facilitate the vibration of the voice coil 7. The voice coil 7 is a flat ring structure made of conductive materials such as copper, aluminum, or copper-clad aluminum. An upper outer magnet 8 and an upper inner magnet 9 located at the center of the upper outer magnet 8 are installed above the voice coil 7. The top of the upper outer magnet 8 is sealed by the upper cover 10.

[0031] Voice coils 7 can be placed on both sides of diaphragm 6, forming a single-diaphragm, dual-voice-coil structure. According to the speaker driving force F=BIL, where L is the number of voice coil turns, a dual-voice-coil speaker has twice the number of turns, meaning the driving force is twice as strong. Therefore, the sensitivity of a dual-voice-coil speaker is 3dB higher. This embodiment only shows a single-voice-coil structure.

[0032] The upper outer magnet 8, upper inner magnet 9, lower outer magnet 4, and lower inner magnet 5 are permanent magnets, and their magnetism will not degrade after magnetization. For miniature speakers, neodymium iron boron magnets are preferred. The heights of the inner and outer magnets need to be consistent to form a plane. The upper outer magnet 8, upper inner magnet 9, lower outer magnet 4, and lower inner magnet 5 constitute the dual magnetic circuit structure of this invention, wherein the upper inner magnet 9 and lower outer magnet 4 have the same magnetism, and the upper outer magnet 8 and lower inner magnet 5 have the same magnetism. Please refer to... Figure 5 The outer magnet has N (S) on top, and the inner magnet has S (N) on top. The voice coil 7 vibrates up and down due to the magnetic lines of force from N to S on the magnetic circuit. Because the voice coil 7 has a flat structure and is located in the middle of the upper and lower magnetic circuits, it is affected by the magnetic lines of force from both the upper and lower magnetic circuits. Compared to a single magnetic circuit, the magnetic field is doubled, and the sensitivity of the speaker increases by at least 3 dB.

[0033] Both the inner magnet 9 and the top cover 10 have sound holes in their centers.

[0034] The plastic frame 1 has a protrusion 11 on its side, and two solder pads 2 are embedded in the protrusion 11. The solder pads 2 are made of metal, such as copper or stainless steel plated with conductive layers such as copper, nickel, or gold. The solder pads 2 are used to solder voice coil wires and external electronic wires.

[0035] The design employs an embedded solder pad 2, integrating the solder pad 2 and the plastic frame 1 into a single structure via injection molding. Advantages include: 1. Eliminating the need for separate bonding of the solder pad 2, simplifying the assembly process. 2. The solder pad 2 is closer to the voice coil 7, facilitating soldering and preventing no-sound issues. 3. The solder pad 2 is divided into a large end and a small end, allowing for separate soldering of the voice coil wires and external electronic wires.

[0036] The solder pad 2 consists of a large head and a small head. The two parts have different soldering functions. The large head is used to connect the voice coil 7 through the wire, and the small head is used to connect external electronic wires.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A planar speaker structure, comprising a plastic frame (1), characterized in that, The plastic basin frame (1) has a step (3) on its inner side. The step (3) and the bottom and side wall of the plastic basin frame (1) form a cavity for enclosing the edge of the lower outer magnet (4). The lower inner magnet (5) is provided in the center of the lower outer magnet (4).

2. The planar horn structure according to claim 1, characterized in that, A diaphragm (6) is provided on the step (3), a voice coil (7) is provided at the bottom of the diaphragm (6), an upper outer magnet (8) and an upper inner magnet (9) located at the center of the upper outer magnet (8) are provided above the voice coil (7), and the top of the upper outer magnet (8) is sealed by an upper cover (10).

3. The planar horn structure according to claim 2, characterized in that, Both the upper inner magnet (9) and the upper cover (10) have sound holes at their centers.

4. The planar horn structure according to claim 2, characterized in that, The plastic basin frame (1) has a boss (11) formed on its side, and two solder pads (2) are embedded in the boss (11).

5. The planar horn structure according to claim 4, characterized in that, The pad (2) consists of a large head and a small head. The large head is connected to the voice coil (7) via a wire, and the small head is connected to an external electronic wire.

6. The planar horn structure according to claim 1, characterized in that, The top of the lower outer magnet (4) has a vibration space for the voice coil (7).

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