Flat horn with magnetic circuit having step structure

Abstract

The utility model discloses a flat horn with a magnetic circuit with a step structure, which comprises a shell, a washer is arranged at the bottom end of the inner side of the shell, a PCB (printed circuit board) is adhered to the bottom of the washer, an outer magnet and an inner magnet are mounted at the top of the washer, the inner magnet is arranged in the center of the outer magnet, and the outer magnet and the inner magnet are respectively provided with a step structure. The step structure of the outer magnet and the step structure of the inner magnet jointly form a step groove used for vibration of the diaphragm and the voice coil, the diaphragm is installed on the top of the outer magnet, and the voice coil is bonded to the bottom of the diaphragm. According to the utility model, the magnet with the step structure is adopted, and the outer magnet and the inner magnet are respectively provided with a step with the height not less than 0.2 mm, so that the distance between the voice coil and the inner plane of the step groove of the magnet is at least 0.5 mm, the diaphragm and the voice coil can be ensured to have enough vibration space, and in addition, the voice coil is also acted by the magnet with the step structure, so that the vibration effect is improved. Therefore, the loudspeaker sensitivity is higher, and the bass effect is improved.

Description

Technical Field

[0001] This utility model relates to the field of loudspeaker technology, and more specifically, to a flat-panel loudspeaker with a stepped magnetic circuit structure. Background Technology

[0002] Current planar speaker designs consist of an inner magnet and an outer magnet, with the voice coil positioned above them at the same height. As low-frequency requirements for speakers increase, the diaphragm and voice coil need amplitudes of at least 0.5mm to satisfy bass requirements. However, a larger distance between the voice coil and the magnet reduces the magnetic field effect on the voice coil, resulting in lower sensitivity. Therefore, current planar speaker designs struggle to meet bass demands. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the bass effect in the prior art by providing a flat panel speaker with a stepped magnetic circuit structure to solve the above-mentioned deficiencies.

[0004] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0005] A flat panel loudspeaker with a stepped magnetic circuit includes a housing. A washer with a PCB board bonded to its bottom is provided on the inner bottom of the housing. An outer magnet and an inner magnet are installed on the top of the washer. The inner magnet is located in the center of the outer magnet. Both the outer magnet and the inner magnet have a stepped structure. The stepped structures of the outer magnet and the inner magnet together form a stepped groove for the vibration of the diaphragm and the voice coil. A diaphragm is installed on the top of the outer magnet, and a voice coil is bonded to the bottom of the diaphragm.

[0006] Preferably, the depth of the stepped groove is not less than 0.2 mm.

[0007] Preferably, the outer magnet and the inner magnet are both integral structures, and the stepped structure is formed on the outer magnet and the inner magnet.

[0008] Preferably, both the outer magnet and the inner magnet are separate structures.

[0009] Preferably, the outer magnet includes a first outer magnet and a second outer magnet bonded together with adhesive, and the inner magnet includes a first inner magnet and a second inner magnet bonded together with adhesive.

[0010] Preferably, the first outer magnet and the second outer magnet are bonded together to form a stepped structure, and the first inner magnet and the second inner magnet are bonded together to form a stepped structure.

[0011] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0012] This invention employs a magnet with a stepped structure. Both the outer and inner magnets are fitted with a step of at least 0.2 mm in height. This ensures that the voice coil is at least 0.5 mm away from the inner plane of the magnet's stepped groove. This provides sufficient vibration space for the diaphragm and voice coil. In addition, the voice coil is also affected by the magnetism of the stepped magnet, thereby increasing the speaker's sensitivity and improving bass performance. Attached Figure Description

[0013] Figure 1 This is a top view assembly diagram of the flat horn with an integrated magnet and stepped structure of this utility model.

[0014] Figure 2 This is an assembly diagram of the flat-panel speaker with an integrated magnet and stepped structure, viewed from below.

[0015] Figure 3 This is an exploded view of the flat panel speaker with an integrated magnet and stepped structure according to this utility model.

[0016] Figure 4 This is a cross-sectional view of the flat horn with an integrated magnet and stepped structure of this utility model;

[0017] Figure 5 This is an exploded view of the split-type flat-panel speaker with stepped structure of this utility model;

[0018] Figure 6 This is a cross-sectional view of the split-type flat horn with stepped structure of this utility model;

[0019] Figure 7 This is a schematic diagram of the magnetic field effect of the flat plate horn with stepped structure of this utility model;

[0020] Figure 8 This is a schematic diagram of the magnetic field effect of a flat-panel horn without a stepped structure.

[0021] In the diagram: 1. Outer shell; 2. Washer; 3. PCB board; 4. Outer magnet; 5. Inner magnet; 6. Stepped structure; 7. Diaphragm; 8. Voice coil; 401. First outer magnet; 402. Second outer magnet; 501. First inner magnet; 502. Second inner magnet. Detailed Implementation

[0022] 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.

[0023] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings.

[0024] Example 1: See Figures 1-4 A flat-panel loudspeaker with a stepped magnetic circuit structure includes a housing 1. A washer 2, with a PCB board 3 bonded to its bottom, is located on the inner bottom of the housing 1. The washer 2 is made of magnetically conductive materials such as SPCC or SPCE, with a thickness of 0.1-0.4mm. Its main function is to guide the magnetic field from the bottom of the outer magnet 4 and the inner magnet 5 to the top of the magnets through the washer 2, increasing the efficiency of the voice coil 8 in the magnetic field. The washer 2 is embedded in the frame, not occupying any height space. The outer magnet 4 and the inner magnet 5 are mounted on the top of the washer 2, with the inner magnet 5 positioned in the center of the outer magnet 4. Both the outer magnet 4 and the inner magnet 5 have a stepped structure 6. The stepped structures 6 of the outer magnet 4 and the inner magnet 5 together form a stepped groove for the vibration of the diaphragm 7 and the voice coil 8. The diaphragm 7 is mounted on the top of the outer magnet 4, and the voice coil 8, a flat, annular shape, is bonded to the bottom of the diaphragm 7 and placed above the gap between the inner and outer magnets. The voice coil 8 has a thickness between 0.05 and 0.3 mm and a width greater than 0.3 mm. The voice coil 8 is made of highly conductive materials such as copper wire, copper-clad aluminum, or aluminum wire. Besides the ring shape specified in this application, the voice coil 8 can also be square.

[0025] Voice coils can be bonded to both the top and bottom of diaphragm 7, presenting a dual voice coil structure (not shown in this embodiment). This doubles the number of turns in the speaker coil, increasing sensitivity by 3dB. This embodiment demonstrates a single voice coil structure.

[0026] The diaphragm 7 consists of a suspension edge with a folded ring and a flat dome. The folded ring is made of one or more composite materials such as PU, TPEE, PEEK, and PET. The dome has a flat structure and is made of a material with good rigidity.

[0027] The outer magnet 4 and inner magnet 5 shown in this embodiment are circular, but can also be square. The magnets are made of neodymium iron boron permanent magnets. The inner magnet 5 and outer magnet 4 have opposite magnetic properties, both oriented along the Y-axis. A gap can be left between the two magnets (as in this embodiment), or no gap can be left (not shown in this embodiment; simply increasing the diameter of the inner magnet 5 to match the center of the outer magnet 4 can achieve a gap-free result). The stepped structure 6 of the inner magnet 5 and outer magnet 4 forms a stepped groove. Since the depth of the stepped groove (as shown) is not less than 0.2 mm, and considering the gap between the voice coil 8 and the tops of the inner magnet 5 and outer magnet 4, this provides the voice coil 8 with a vibration space of not less than 0.5 mm.

[0028] Both the outer magnet 4 and the inner magnet 5 are integral structures. The stepped structure 6 is formed on the outer magnet 4 and the inner magnet 5. The integral outer magnet 4 and the inner magnet 5 need to be processed to form the stepped structure 6. The two stepped structures 6 form a groove-shaped stepped groove for the vibration of the voice coil 8.

[0029] Example 2: See Figure 5 and Figure 6 The difference between this embodiment and embodiment 1 is that the outer magnet 4 and the inner magnet 5 are both separate structures. The outer magnet 4 includes a first outer magnet 401 and a second outer magnet 402 bonded together with glue. The inner magnet 5 includes a first inner magnet 501 and a second inner magnet 502 bonded together with glue. The height of the second outer magnet 402 and the second inner magnet 502 is not less than 0.2 mm. The first outer magnet 401 and the second outer magnet 402 are bonded together to form a stepped structure 6. The first inner magnet 501 and the second inner magnet 502 are bonded together to form a stepped structure 6. The purpose of this is that the magnets do not need to be processed into a stepped structure 6. Two outer magnets and two inner magnets of different sizes can be selected and directly bonded together to form a stepped structure 6, which reduces the manufacturing cost. The two stepped structures 6 formed directly also form a groove-shaped stepped groove for the vibration of the voice coil 8.

[0030] See Figure 7 and Figure 8 The BL value of the structure with stepped magnets is improved compared to that without stepped magnets, and the speaker sensitivity is also improved.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0032] 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 flat panel loudspeaker with a stepped magnetic circuit structure, comprising a housing (1), characterized in that: The inner bottom of the outer casing (1) is provided with a washer (2) with a PCB board (3) bonded to the bottom. An outer magnet (4) and an inner magnet (5) are installed on the top of the washer (2). The inner magnet (5) is located in the center of the outer magnet (4). Both the outer magnet (4) and the inner magnet (5) have a stepped structure (6). The stepped structure (6) of the outer magnet (4) and the stepped structure (6) of the inner magnet (5) together form a stepped groove for the vibration of the diaphragm (7) and the voice coil (8). The diaphragm (7) is installed on the top of the outer magnet (4), and the voice coil (8) is bonded to the bottom of the diaphragm (7).

2. A flat panel loudspeaker with a stepped magnetic circuit structure according to claim 1, characterized in that: The depth of the stepped groove is not less than 0.2 mm.

3. A flat panel loudspeaker with a stepped magnetic circuit structure according to claim 1, characterized in that: The outer magnet (4) and the inner magnet (5) are both integral structures, and the stepped structure (6) is formed on the outer magnet (4) and the inner magnet (5).

4. A flat panel loudspeaker with a stepped magnetic circuit structure according to claim 1, characterized in that: Both the outer magnet (4) and the inner magnet (5) are separate structures.

5. A flat panel loudspeaker with a stepped magnetic circuit structure according to claim 4, characterized in that: The outer magnet (4) includes a first outer magnet (401) and a second outer magnet (402) bonded together with glue, and the inner magnet (5) includes a first inner magnet (501) and a second inner magnet (502) bonded together with glue.

6. A flat panel loudspeaker with a stepped magnetic circuit structure according to claim 5, characterized in that: The first outer magnet (401) and the second outer magnet (402) are bonded together to form a stepped structure (6), and the first inner magnet (501) and the second inner magnet (502) are bonded together to form a stepped structure (6).

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