High-sensitivity planar horn

Abstract

The utility model discloses a plane horn with high sensitivity, which comprises a shell, an upper magnetic circuit, an upper diaphragm support ring, a diaphragm, a lower diaphragm support ring and a lower magnetic circuit are sequentially arranged in the shell from top to bottom, an upper washer is embedded in the upper magnetic circuit, a lower washer is embedded in the lower magnetic circuit, and a PCB (printed circuit board) is mounted on the side surface of the shell. According to the utility model, the magnetic circuit adopts the structure of the inner magnet and the outer magnet, the washer is arranged between the inner magnet and the outer magnet, the upper washer and the lower washer are arranged between the inner magnet and the outer magnet, and the bottom of the lower washer is flush with the inner magnet and the outer magnet, so that magnetic lines of force at the bottoms of the inner magnet and the outer magnet can be concentrated on the voice coil through the washers; therefore, the efficiency of the voice coil under the action of a magnetic field can be improved by more than 70%, the magnetic field efficiency is improved by 50% through the upper and lower magnetic circuit structures, and the loudspeaker sensitivity can be improved by more than 3dB.

Description

Technical Field

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

[0002] Traditional planar loudspeakers consist of an inner magnet and an outer magnet. Because the magnetic field lines of the magnets are dispersed, the voice coil is inefficient when placed in a magnetic field due to the influence of the magnetic field lines, resulting in low speaker sensitivity. Utility Model Content

[0003] The purpose of this invention is to provide a high-sensitivity planar speaker that can improve the efficiency of magnetic field action by more than 70%. The upper and lower magnetic circuit structure can improve the magnetic field efficiency by 50% and the speaker sensitivity by more than 3dB, thereby solving the problems in the prior art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A high-sensitivity planar loudspeaker includes a housing. Inside the housing, from top to bottom, there are an upper magnetic circuit, an upper diaphragm support ring, a diaphragm, a lower diaphragm support ring, and a lower magnetic circuit. An upper washer is embedded inside the upper magnetic circuit, and a lower washer is embedded inside the lower magnetic circuit. A PCB board is mounted on the side of the housing.

[0006] Furthermore, both the upper and lower magnetic circuits include an inner magnet and an outer magnet. An upper washer is disposed between the inner and outer magnets in the upper magnetic circuit, and a lower washer is disposed between the inner and outer magnets in the lower magnetic circuit.

[0007] Furthermore, the top of the upper washer is flush with the tops of the inner and outer magnets, and the bottom of the lower washer is flush with the bottoms of the inner and outer magnets.

[0008] Furthermore, a voice coil is provided at the bottom of the diaphragm, and the voice coil is placed above the gap between the inner and outer magnets in the lower magnetic circuit.

[0009] Furthermore, a sound hole is provided in the center of the inner magnet of the upper magnetic circuit.

[0010] Furthermore, a top cover is provided on the top of the outer casing, and a sound outlet is provided in the center of the top cover.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] The magnetic circuit of this invention adopts an inner magnet and an outer magnet structure, with a washer placed between the inner and outer magnets. Both the upper and lower washers are placed between the inner and outer magnets, and the bottom of the lower washer is flush with the inner and outer magnets. This allows the magnetic lines of force at the bottom of the inner and outer magnets to pass through the washer and concentrate on the voice coil. Therefore, the efficiency of the voice coil under the influence of the magnetic field can be increased by more than 70%. The upper and lower magnetic circuit structure increases the magnetic field efficiency by 50%, and the speaker sensitivity can be increased by more than 3dB. Attached Figure Description

[0013] Figure 1 This is an assembly drawing of the dual-magnetic-circuit planar loudspeaker of this utility model;

[0014] Figure 2 This is an exploded view of the dual-magnetic-circuit planar loudspeaker of this utility model;

[0015] Figure 3 This is a cross-sectional view of the dual-magnetic-circuit planar horn of this utility model;

[0016] Figure 4 This is an assembly drawing of the single magnetic circuit planar loudspeaker of this utility model;

[0017] Figure 5 This is an exploded view of the single magnetic circuit planar loudspeaker of this utility model;

[0018] Figure 6 This is a cross-sectional view of the single magnetic circuit planar horn of this utility model;

[0019] Figure 7 This is a diagram showing the distribution of magnetic field lines in this invention.

[0020] Figure 8 This is a comparison chart of the BL values ​​of this utility model and a traditional speaker.

[0021] In the diagram: 1. Outer shell; 2. Upper diaphragm support ring; 3. Diaphragm; 4. Lower diaphragm support ring; 5. Upper washer; 6. Lower washer; 7. Inner magnet; 8. Outer magnet; 9. Voice coil; 10. Sound outlet; 11. Top cover; 12. PCB board. 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] Example 1: This example demonstrates a dual magnetic circuit structure. (See attached document.) Figures 1-3A high-sensitivity planar loudspeaker includes a housing 1. Inside the housing 1, from top to bottom, are arranged an upper magnetic circuit, an upper diaphragm support ring 2, a diaphragm 3, a lower diaphragm support ring 4, and a lower magnetic circuit. An upper washer 5 is embedded inside the upper magnetic circuit, and a lower washer 6 is embedded inside the lower magnetic circuit. The upper and lower washer 5 and 6 are made of SPCC or SPCD, etc., and have good magnetic conductivity, improving the efficiency of the internal and external magnetic fields, increasing the BL value by more than 70%. The shapes of the upper and lower washer 5 and 6 can be annular, circular, or square, or they can be strip-shaped or segmented arc-shaped. The height of the upper and lower washer 6 is less than half the height of the magnets for higher magnetic conductivity. A PCB board 12 is mounted on the side of the housing 1, and the PCB board 12 is connected to the voice coil 9 via wires.

[0024] The upper and lower magnetic circuits have opposite magnetic properties. This upper and lower magnetic circuit structure improves the magnetic field efficiency by 50% and increases the speaker sensitivity by more than 3dB.

[0025] Both the upper and lower magnetic circuits include an inner magnet 7 and an outer magnet 8. An upper washer 5 is disposed between the inner magnet 7 and the outer magnet 8 in the upper magnetic circuit, and a lower washer 6 is disposed between the inner magnet 7 and the outer magnet 8 in the lower magnetic circuit. Besides the shape shown in this embodiment, the inner magnet 7 and the outer magnet 8 can also be ring-shaped, square, strip-shaped, or segmented arc-shaped. The magnetism of both the inner magnet 7 and the outer magnet 8 is in the vertical direction, and their magnetisms are opposite (e.g., ...). Figure 3 As shown in the diagram, the arrows indicate the direction of the magnet's magnetic field. A gap of at least 0.1 mm should be left between the inner and outer magnets to accommodate the upper and lower washer.

[0026] A voice coil 9 is disposed at the bottom of the diaphragm 3. In this embodiment, the voice coil 9 is a flat annular shape, which can be circular or square. The voice coil 9 is bonded to the diaphragm 3 and is positioned above the gap between the inner and outer magnets in the lower magnetic circuit. The voice coil 9 can also be bonded to the top of the diaphragm 3 to present a dual voice coil structure (not shown in this embodiment). This doubles the number of turns of the speaker coil and can improve the sensitivity by 3dB.

[0027] The upper and lower washers are placed between the inner magnet 7 and the outer magnet 8, with the top of the upper washer 5 flush with the tops of the inner magnet 7 and the outer magnet 8.

[0028] A sound hole 10 is provided in the center of the inner magnet 7 in the upper magnetic circuit.

[0029] Example 2: This example differs from Example 1 in that it uses a single magnetic circuit structure. (See attached document.) Figures 4-6 There is no upper magnetic circuit, only a lower magnetic circuit. Furthermore, this embodiment only has a lower diaphragm support ring 4, without an upper diaphragm support ring 2. The bottom of the lower washer 6 is flush with the bottoms of the inner magnet 7 and the outer magnet 8. This design allows the magnetic lines of force at the bottoms of the inner magnet 7 and the outer magnet 8 to pass through the lower washer 6 (e.g., Figure 6 As shown in the diagram (the arrows indicate the direction of the magnet's magnetic field), the magnetic field is concentrated in the upper voice coil 9. Therefore, the efficiency of the voice coil 9 under the influence of the magnetic field can be increased by more than 70% (e.g., Figure 7 As shown, line M represents the magnetic field lines at the bottom of the magnet, and region P is the area where the magnetic field lines are concentrated. Figure 8 As shown, a is the BL value of the planar speaker structure of this utility model, and b is the BL value of the traditional speaker structure. A top cover 11 is provided on the top of the outer shell 1. The top cover 11 is made of metal or plastic and has a hole in the middle or on the side to facilitate the sound output of the diaphragm 3. In this embodiment, the sound outlet 10 is opened in the center of the top cover 11.

[0030] 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 high-sensitivity planar loudspeaker, comprising a housing (1), characterized in that, The interior of the outer shell (1) is provided with an upper magnetic circuit, an upper diaphragm support ring (2), a diaphragm (3), a lower diaphragm support ring (4) and a lower magnetic circuit in sequence from top to bottom. An upper washer (5) is embedded inside the upper magnetic circuit, and a lower washer (6) is embedded inside the lower magnetic circuit. A PCB board (12) is mounted on the side of the outer shell (1).

2. The high-sensitivity planar loudspeaker according to claim 1, characterized in that, Both the upper and lower magnetic circuits include an inner magnet (7) and an outer magnet (8). An upper washer (5) is provided between the inner magnet (7) and the outer magnet (8) of the upper magnetic circuit, and a lower washer (6) is provided between the inner magnet (7) and the outer magnet (8) of the lower magnetic circuit.

3. The high-sensitivity planar loudspeaker according to claim 2, characterized in that, The top of the upper washer (5) is flush with the top of the inner magnet (7) and the outer magnet (8), and the bottom of the lower washer (6) is flush with the bottom of the inner magnet (7) and the outer magnet (8).

4. The high-sensitivity planar loudspeaker according to claim 2, characterized in that, A voice coil (9) is provided at the bottom of the diaphragm (3), and the voice coil (9) is placed above the gap between the inner magnet (7) and the outer magnet (8) in the lower magnetic circuit.

5. The high-sensitivity planar loudspeaker according to claim 1, characterized in that, The inner magnet (7) of the upper magnetic circuit has a sound hole (10) in the center.

6. The high-sensitivity planar loudspeaker according to claim 1, characterized in that, The top of the outer casing (1) is provided with a top cover (11), and a sound outlet (10) is provided in the center of the top cover (11).

Images