Novel planar magnetic horn with magnetic conductive sheet on magnetic array

Abstract

The utility model discloses a novel planar magnetic horn with magnetic conductive sheets in a magnetic array. The novel planar magnetic horn comprises a coil vibrating diaphragm assembly and two magnetic circuit assemblies, wherein magnetic poles of the two magnetic circuit assemblies are arranged on two sides of the coil vibrating diaphragm assembly in a mirror image manner; the magnetic circuit assembly comprises a first bar-shaped magnet, a second bar-shaped magnet, a third bar-shaped magnet and a fourth bar-shaped magnet which are arranged at intervals; the magnetic directions of the first bar-shaped magnet and the third bar-shaped magnet are parallel to the coil vibrating diaphragm assembly; the magnetic directions of the second bar-shaped magnet and the fourth bar-shaped magnet are perpendicular to the coil vibrating diaphragm assembly; magnetic poles of the first bar-shaped magnet and the third bar-shaped magnet are opposite, and magnetic poles of the second bar-shaped magnet and the fourth bar-shaped magnet are opposite; the outer sides of the two magnetic circuit assemblies are respectively provided with a magnetic conductive sheet with holes. And the coil is arranged on the vibrating diaphragm projected by the magnet of which the magnetic direction is parallel to that of the coil vibrating diaphragm assembly. According to the utility model, the arrangement in four directions is adopted, and the magnetic conductive sheet holes are combined to effectively change the damping of the loudspeaker, so that the magnetic field efficiency is greatly improved.

Description

Technical Field

[0001] This utility model belongs to the field of loudspeaker technology, specifically relating to a novel planar magnetic loudspeaker with a magnetic array and a magnetic conductive sheet. Background Technology

[0002] Planar magnetic headphones are a type of Hi-Fi headphone. They primarily produce sound by using the magnetic force generated by magnets with opposite poles to vibrate a diaphragm containing a coil. Current planar magnetic headphones typically have two rows of magnets, one above the other, with the diaphragm positioned in the middle. The upper and lower magnets attract each other, while the left and right magnets in the same row attract each other. The portion of the diaphragm containing the coil is located between the upper and lower magnetic poles. The existing magnetic pole arrangement has two directions: perpendicular to the diaphragm, with the strongest magnetic force located between two adjacent magnets.

[0003] To increase magnetic field strength and efficiency, the main methods currently used are to reduce the spacing between magnets or increase their volume. While these methods can improve efficiency to some extent, the efficiency remains relatively low due to the portability and size constraints of headphones.

[0004] The information disclosed in the above background section is only intended to enhance the understanding of the overall background of this utility model, and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a novel planar magnetic speaker with a magnetic array and a magnetic guide sheet. Based on a scheme that does not change the placement of the magnets, the magnetization direction of the magnets is changed, and the damping of the speaker is effectively changed by combining the holes of the magnetic guide sheet, thereby changing the frequency response of the speaker and greatly improving the magnetic field efficiency.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A novel planar magnetic loudspeaker with magnetic array and magnetic conductive sheets includes a coil diaphragm assembly and two magnetic circuit assemblies arranged parallel to each other on both sides of the coil diaphragm assembly in a mirror image of the magnetic poles. Each magnetic circuit assembly includes a first, second, third, and fourth bar magnet arranged with gaps between them. The magnetization directions of the first and third bar magnets are parallel to the coil diaphragm assembly, while the magnetization directions of the second and fourth bar magnets are perpendicular to the coil diaphragm assembly. The first and third bar magnets have opposite magnetic poles, and the second and fourth bar magnets have opposite magnetic poles, forming a Heilbeck magnetic circuit. Magnetic conductive sheets are also disposed on the outer sides of each magnetic circuit assembly, and the surfaces of the conductive sheets are uniformly provided with through holes. The coil of the coil diaphragm assembly is connected between the positive and negative poles of a signal source, and the coil wiring is positioned on the diaphragm projected onto the magnet whose magnetization direction is parallel to the coil diaphragm assembly.

[0008] Specifically, the minimum wall thickness between the through holes is 0.1 mm.

[0009] Specifically, the wiring position of the coil extends at least to cover a portion of the magnet whose magnetic direction is perpendicular to that of the coil diaphragm assembly, and does not exceed the center position of its N pole.

[0010] Specifically, adjacent magnets in the magnetic circuit assembly have the same gap.

[0011] Specifically, it also includes a magnetic circuit frame, a diaphragm mounting frame, and a magnetic circuit lower frame. The two rows of magnetic circuit components are respectively fixed in the magnetic circuit frame and the magnetic circuit lower frame with glue. Two magnetic conductive sheets are respectively fixed to the outside of the magnetic circuit frame and the magnetic circuit lower frame with glue. The coil diaphragm assembly is set in the diaphragm mounting frame. The diaphragm mounting frame is fixed to the magnetic circuit frame with screws, and the magnetic circuit lower frame is connected to the diaphragm mounting frame with screws.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. This solution uses a four-directional arrangement of magnet poles, which significantly improves the overall magnetic field compared to the conventional magnetic field with only two directions. Furthermore, the magnetic force on the diaphragm is more concentrated and uniform, resulting in a significant improvement in headphone efficiency.

[0014] 2. This solution combines a magnetic guide sheet. The magnetic guide sheet acts as a washer, increasing the density of the magnetic field lines of the magnets arranged in four directions. In addition, the holes in the magnetic guide sheet can effectively change the damping of the speaker by changing the airflow. When the diaphragm moves up and down, the air passes through the gaps between the magnets and through the holes in the magnetic guide sheet, thereby changing the resonance peak of the speaker system and adjusting the frequency response of the speaker. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a novel planar magnetic speaker with magnetic array and magnetic conductive sheet according to the present invention.

[0016] Figure 2 This is an exploded schematic diagram of a novel planar magnetic speaker with magnetic array and magnetic conductive sheet according to this utility model.

[0017] Figure 3 This is a schematic diagram of the magnetic pole direction of a novel planar magnetic horn with magnetic array and conductive sheet according to this utility model.

[0018] In the diagram, 1-first bar magnet; 2-second bar magnet; 3-third bar magnet; 4-fourth bar magnet; 6-upper magnetic conductor sheet; 7-lower magnetic conductor sheet; 8-magnetic circuit frame; 9-diaphragm mounting frame; 10-diaphragm; 11-coil; 12-lower magnetic circuit frame. Detailed Implementation

[0019] To explain the technical content, objectives, and effects of this utility model in detail, the following description is provided in conjunction with embodiments and accompanying drawings. In the description of these embodiments, it should be understood that terms indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing this embodiment and simplifying the description. They do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0020] The technical solution adopted in this embodiment is a novel planar magnetic headphone, such as... Figure 1-3 As shown, it mainly includes a coil diaphragm assembly, a magnetic circuit assembly, a magnetic circuit frame 8, a diaphragm 10 mounting frame 9, a magnetic circuit lower frame 12, an upper magnetic conductor 6, and a lower magnetic conductor 7.

[0021] The magnetic circuit assembly has a row-type structure, with two sets of magnetic circuit assemblies arranged parallel to each other on the upper and lower sides of the coil diaphragm assembly in the form of mirror images of magnetic poles. For example... Figure 1 As shown, after the upper row of magnetic circuit components is magnetized, it is fixed to the frame 8 of the magnetic circuit with glue. The upper magnetic conductive sheet 6 is fixed to the frame 8 of the magnetic circuit with glue. The coil 11 and diaphragm 10 in the middle are set in the diaphragm mounting frame 9. The diaphragm mounting frame 9 is fixed to the frame 8 of the magnetic circuit with glue or screws. At the same time, after the lower row of magnetic circuit components is magnetized, it is fixed to the lower frame 12 of the magnetic circuit with glue. The lower magnetic conductive sheet 7 is fixed to the lower frame 12 of the magnetic circuit with glue, and then connected to the middle diaphragm 10 to form a whole magnetic circuit.

[0022] In this embodiment, the magnetic circuit assembly has four directions, with the N pole pointing upwards. The N pole is divided into up, down, left, and right directions. The up and down magnetic pole directions are 180° apart, the left is 90° apart from the up and down directions, and the right is 90° apart from the up and down directions.

[0023] Each magnetic circuit assembly includes a first bar magnet 1, a second bar magnet 2, a third bar magnet 3, and a fourth bar magnet 4 arranged in a spaced-apart configuration. The magnetization directions of the first bar magnet 1 and the third bar magnet 3 are parallel to the coil diaphragm assembly; the magnetization directions of the second bar magnet 2 and the fourth bar magnet 4 are perpendicular to the coil diaphragm assembly. The magnetic poles of the first bar magnet 1 and the third bar magnet 3 are opposite, and the magnetic poles of the second bar magnet 2 and the fourth bar magnet 4 are opposite, so that the magnetic circuit assembly forms a Heilbeck magnetic circuit. Figure 3 As shown, in this embodiment, in the upper row of magnetic circuit components, the first bar magnet 1 has its N pole facing left, the second bar magnet 2 has its N pole facing up, the third bar magnet 3 has its N pole facing right, and the fourth bar magnet 4 has its N pole facing down. Each group of magnetic circuit components includes at least four bar magnets, and the number of magnets is increased cyclically according to the above order based on the magnetic field strength.

[0024] The addition of transverse magnetic poles increases the magnetic field strength, thereby improving the efficiency of the magnetic field. The strongest magnetic force is located at the position of the opposing magnets with their poles pointing left and right. The weakest magnetic force is located at the center of the opposing magnets with their poles pointing up and down. The strongest magnetic force is 10% to 20% stronger than that of a conventional planar magnet.

[0025] like Figure 2 As shown, upper magnetic guide sheet 6 and lower magnetic guide sheet 7 are respectively provided on the outer side of the two magnetic circuit components. Through holes are uniformly arranged on the surface of the magnetic guide sheets. The through holes are designed to allow air to pass through the gaps between the magnets and through the holes in the magnetic guide sheets when the diaphragm 10 moves up and down, thereby changing the resonant peak of the speaker system and adjusting the speaker's frequency response. Speaker sound production is mainly caused by the diaphragm pushing air to produce sound. When the speaker diaphragm is subjected to different damping, the speaker's vibration will be affected, and the affected vibration state will also affect the sound production. The size and distribution range of the holes need to be adjusted according to specific needs based on the damping. In this embodiment, the optimal value is a minimum wall thickness of 0.1mm between the through holes. This helps to reduce sound wave reflection interference and improve frequency response consistency and mid-to-high frequency response while ensuring structural integrity and magnetic conductivity.

[0026] The coil diaphragm assembly in this embodiment includes an integral coil 11 and a diaphragm 10. The coil 11 is connected between the positive and negative poles of the signal source. The coil 11 includes parallel straight line segments and arc-shaped segments connected to the ends of adjacent straight line segments. The straight line segments are correspondingly positioned on the diaphragm 10, which is located on the second bar magnet 2, the fourth bar magnet 4, and the projected straight lines. Preferably, the wiring of the coil covers the second bar magnet 2 and the fourth bar magnet 4, and at least extends to cover a portion of the first bar magnet 1 and the third bar magnet 3, wherein the covered first bar magnet 1 and third bar magnet 3 do not exceed the center position of their N poles. The total wiring area is 10% to 15% larger than the total wiring area of ​​a conventional planar magnetic speaker. According to Ampere's law, the force-bearing area of ​​the diaphragm 10 will also increase. With an increased force-bearing area, the force received by the diaphragm 10 will be more uniform and ideal, resulting in better speaker performance. This ensures that the coil 11 is always in the region with the strongest magnetic field and the most suitable direction, avoiding interference from magnetic field non-uniformity on diaphragm vibration, and achieving a balance between performance and manufacturing cost.

[0027] Although the present invention has been described in detail above with specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A novel planar magnetic loudspeaker with a magnetic array and conductive sheet, characterized in that: It includes a coil diaphragm assembly and two magnetic circuit assemblies that are arranged in parallel on both sides of the coil diaphragm assembly in the form of magnetic pole mirror images; The magnetic circuit assembly includes a first bar magnet, a second bar magnet, a third bar magnet, and a fourth bar magnet arranged in a gap-like configuration. The magnetization directions of the first and third bar magnets are parallel to the coil diaphragm assembly, while the magnetization directions of the second and fourth bar magnets are perpendicular to the coil diaphragm assembly. The first and third bar magnets have opposite magnetic poles, and the second and fourth bar magnets have opposite magnetic poles, so that the magnetic circuit assembly forms a Heilbeck magnetic circuit. The outer sides of the two magnetic circuit components are also provided with magnetic conductive sheets, and the surface of the magnetic conductive sheets is uniformly provided with through holes; The coil of the coil diaphragm assembly is connected between the positive and negative poles of the signal source, and the coil wiring position is correspondingly set on the diaphragm projected by the magnet located in the magnetization direction parallel to the coil diaphragm assembly.

2. The novel planar magnetic speaker with magnetic array and conductive sheet according to claim 1, characterized in that: The minimum wall thickness between the through holes is 0.1 mm.

3. The novel planar magnetic speaker with magnetic array and conductive sheet according to claim 1, characterized in that: The wiring of the coil extends at least to cover a portion of the magnet whose magnetic direction is perpendicular to that of the coil diaphragm assembly, and does not exceed the center of its N pole.

4. The novel planar magnetic speaker with magnetic array and conductive sheet according to claim 1, characterized in that: The magnetic circuit assembly has the same gap between adjacent magnets.

5. The novel planar magnetic speaker with magnetic array and conductive sheet according to claim 1, characterized in that: It also includes a magnetic circuit frame, a diaphragm mounting frame, and a magnetic circuit lower frame. The two rows of magnetic circuit components are respectively fixed in the magnetic circuit frame and the magnetic circuit lower frame with glue. Two magnetic conductive sheets are respectively fixed to the outside of the magnetic circuit frame and the magnetic circuit lower frame with glue. The coil diaphragm assembly is set in the diaphragm mounting frame. The diaphragm mounting frame is fixed to the magnetic circuit frame with screws, and the magnetic circuit lower frame is connected to the diaphragm mounting frame with screws.

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