A forward-facing coaxial loudspeaker

Abstract

This utility model discloses a forward coaxial loudspeaker, including a low-frequency unit, a high-frequency unit, and a bracket. The low-frequency unit has a low-frequency diaphragm on its upper wall. The high-frequency unit is positioned above the low-frequency unit, and its upper wall also has a high-frequency diaphragm. The low-frequency and high-frequency diaphragms face the same direction and are coaxially arranged. The bracket extends from the low-frequency unit to the axis of the low-frequency diaphragm and fits against it. The high-frequency unit is located on the upper wall of the bracket. By placing the bracket between the low-frequency and high-frequency units, the low-frequency and high-frequency diaphragms of the low-frequency and high-frequency units are coaxially and in the same direction. This allows for better sound quality with a smaller size and thickness. Furthermore, the high-frequency and low-frequency units can be controlled separately, reducing resonance issues and improving the sound quality of the coaxial loudspeaker. The control logic is also simpler and more stable, and the coaxial arrangement contributes to a more three-dimensional sound.

Description

Technical Field

[0001] This utility model relates to the field of loudspeakers, and in particular to a positive coaxial loudspeaker. Background Technology

[0002] A coaxial speaker is a high- and low-frequency audio signal device. This device essentially has two speakers, one for high frequencies and one for low frequencies. That is, two loudspeakers are mounted on the same axis, one responsible for reproducing high frequencies and the other for mid- and low-frequency frequencies. Furthermore, the diaphragms of these two loudspeakers overlap. Because their physical positioning is close to a point source, the sound field localization of the reproduced music is ideal.

[0003] However, in the existing speaker design of wireless headphones, the coaxial speaker is small in size due to the influence of the headphone shell, which in turn affects the size of the coaxial speaker and thus reduces its sound quality. Therefore, the key to the design is how to ensure the sound quality of the headphones without increasing the size.

[0004] For example, Chinese Patent 202110878961.2 achieves the independence of the first speaker unit and the second speaker unit through the base body, thereby improving the sound quality of the speaker. However, in actual production, the production cost of this irregular structure is high, which affects the production of the speaker. At the same time, this structure also has limitations in terms of small volume.

[0005] Of course, there are also structures that use the earphone shell to achieve independent high-frequency and low-frequency units, such as Chinese Patent 201610107713.7. However, its sound outlet is coaxial, and for smaller earphones, its sound quality will also decrease. Utility Model Content

[0006] The main purpose of this invention is to propose a forward coaxial speaker, which aims to improve the speaker structure of existing wireless headphones, thereby achieving the independence of the high-frequency unit and the low-frequency unit, improving frequency quality stability while reducing production costs and increasing market share.

[0007] To achieve the above objectives, this utility model proposes a forward coaxial loudspeaker, comprising: A low-frequency unit, wherein a low-frequency diaphragm is provided on the upper wall of the low-frequency unit; A high-frequency unit is located above the low-frequency unit, and a high-frequency diaphragm is provided on the upper wall of the high-frequency unit. The low-frequency diaphragm and the high-frequency diaphragm are oriented in the same direction and are coaxially arranged; The bracket extends from the low-frequency unit to the axial position of the low-frequency diaphragm and fits against it, while the high-frequency unit is located on the upper wall of the bracket.

[0008] In practical design, by setting a bracket between the low-frequency unit and the high-frequency unit, the low-frequency diaphragm and the high-frequency diaphragm of the low-frequency unit and the high-frequency unit are coaxially and in the same direction. This allows for better sound quality with a smaller size and thickness. The high-frequency unit and the low-frequency unit can be controlled separately, thereby reducing resonance problems and improving the sound quality of the coaxial speaker. The control logic is also simpler and more stable. The coaxial setting makes the sound quality more three-dimensional, and it also increases the size of the low-frequency unit and the high-frequency unit without increasing the volume too much. Attached Figure Description

[0009] Figure 1 This is a cross-sectional view of the present invention; Figure 2 For the explosion of this invention Figure 1 ; Figure 3 For the explosion of this invention Figure 2 ; Figure 4 This is a cross-sectional view of the magnetic pole distribution of the present invention; Figure 5 This is a three-dimensional schematic diagram of the present invention; Figure 6 This is a half-sectional schematic diagram of the present invention; Figure 7 This is a 3D schematic diagram of the support frame; Figure 8 This is a schematic diagram showing the fit between the low-frequency washer and the low-frequency housing. Figure 9 This is a schematic diagram of the cross-sectional view of the low-frequency washer and the low-frequency housing. Figure 10 Set up a magnetic flux comparison chart for the low-frequency unit; Figure 11 Set up a magnetic flux comparison chart for the high-frequency unit.

[0010] In the picture, 1 is a low-frequency unit. 11 is the low-frequency housing, 12 is the bottom washer, 13 is the low-frequency center lower magnet, 14 is the low-frequency center lower washer, 15 is the low-frequency center upper magnet, 16 is the low-frequency ring magnet, and 17 is the low-frequency ring washer. 18 is the low-frequency magnetic circuit gap, 19 is the low-frequency diaphragm, 101 is the low-frequency voice coil, 102 is the clearance groove, and 103 is the low-frequency solder pad. 2 is a high-frequency unit. 21 is a high-frequency U-shaped magnet, 22 is a high-frequency center magnet, 23 is a high-frequency ring magnet, 24 is a high-frequency diaphragm, 25 is a high-frequency center washer, 26 is a high-frequency voice coil, and 27 is a high-frequency magnetic circuit gap. 3 is the bracket, 30 is the magnetic guide frame, 31 is the positioning frame, 311 is the connecting part, 312 is the support part, 313 is the stepped part, and 4 is the notch. 5 is the high-frequency solder joint, 51 is the high-frequency cable, and 52 is the low-frequency cable. Detailed Implementation

[0011] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0012] It should be noted that if any directional indication (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial, etc.) is involved in the embodiments of this utility model, the directional indication is only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0013] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0014] like Figures 1 to 11 As shown, a positive coaxial loudspeaker includes: Low-frequency unit 1, wherein a low-frequency diaphragm is provided on the upper wall of the low-frequency unit 1; High-frequency unit 2 is located above low-frequency unit 1, and a high-frequency diaphragm 24 is provided on the upper wall of high-frequency unit 2. The low-frequency diaphragm and the high-frequency diaphragm 24 are oriented in the same direction and are coaxially arranged; The bracket 3 extends from the low-frequency unit 1 to the axial position of the low-frequency diaphragm and fits together with it. The high-frequency unit 2 is located on the upper wall of the bracket 3.

[0015] In the actual design, by setting a bracket 3 between the low-frequency unit 1 and the high-frequency unit 2, the low-frequency diaphragm 24 of the low-frequency unit 1 and the high-frequency unit 2 are coaxially and in the same direction. This allows for better sound quality with a smaller size and thickness. The high-frequency unit 2 and the low-frequency unit 1 can be controlled separately, thereby reducing resonance problems and improving the sound quality of the coaxial speaker. The control logic is also simpler and more stable. The coaxial setting makes the sound quality more three-dimensional. It also increases the size of the low-frequency unit 1 and the high-frequency unit 2 without increasing the volume too much.

[0016] Specifically, the support 3 includes a magnetic guide frame 30, which is disposed on the top wall of the low-frequency diaphragm and the bottom wall of the high-frequency unit 2. The magnetic guide frame 30 can apply a downward magnetic force to the low-frequency magnetic circuit assembly of the low-frequency unit 1. The magnetic guide frame 30 can apply an upward magnetic guiding force to the high-frequency magnetic circuit assembly of the high-frequency unit 2.

[0017] Unlike existing designs, the magnetic guide frame 30 serves as the base, enabling magnetic field guidance for both the low-frequency and high-frequency magnetic circuit components. This reduces the design of the washer between the high-frequency unit 2 and the low-frequency unit 1, while simultaneously increasing the magnetic energy BL value of both components.

[0018] For details, please refer to Figure 10 and Figure 11 , in Figure 10 The changes in BL value of the dual-unit low-frequency unit 1 with and without magnetic guide frame 30 are shown. The magnetic accumulation energy BL value of the low-frequency unit 1 after adding magnetic guide frame 30 increases from 0.789 to 0.84. in Figure 11 The changes in BL value of the dual-unit high-frequency unit 2 with and without magnetic guide frame 30 are shown. The magnetic accumulation energy BL value of the high-frequency unit 2 after adding magnetic guide frame 30 increases from 0.234 to 0.267.

[0019] Specifically, the magnetic guide frame 30 is a hollow column, and the bottom wall of the magnetic guide frame 30 is attached to the middle of the top wall of the low-frequency diaphragm.

[0020] Specifically, the bracket 3 further includes a positioning frame 31, which includes a connecting portion 311 and a support portion 312 extending horizontally from the connecting portion 311. The lower end of the connecting portion 311 is disposed on the outer wall of the low-frequency unit. Specifically, it is installed on the outer wall of the low-frequency bracket 3. The bottom wall of the support portion 312 is in contact with the top wall of the magnetic guide frame 30, and the top wall of the support portion 312 is in contact with the bottom wall of the high-frequency unit. The positioning frame 31 is made of non-magnetic material, and the top wall of the specific support part 312 is attached to the bottom wall of the high-frequency U-iron of the high-frequency unit, thereby improving the magnetic conductivity.

[0021] Specifically, the support portion 312 is provided with a stepped portion 313 extending into the hollow column, and the support portion 312 is fixed to the magnetic guide frame 30 by adhesive or ultrasonic welding. The bottom wall of the magnetic guide frame 30 is bonded to the low-frequency diaphragm with adhesive, and an inner groove is provided at the position where the low-frequency diaphragm is bonded to the magnetic guide frame 30. The connecting part 311 is bonded to the low-frequency unit 1 through a slot.

[0022] The use of adhesive bonding can effectively reduce resonance and dampen vibration. Meanwhile... The step section 313, inner groove, and slot effectively provide support, precise positioning, and stable installation, improving the coaxial setup effect. At the same time, it simplifies assembly, thereby increasing production efficiency, reducing production costs, and minimizing the increase in volume.

[0023] Specifically, the low-frequency unit 1 includes a low-frequency housing 11, a bottom washer 12 disposed at the bottom of the low-frequency housing 11, a low-frequency center lower magnet 13 disposed in the middle of the bottom washer 12, a low-frequency center lower washer 14 disposed on the upper wall of the low-frequency center lower magnet 13, a low-frequency center upper magnet 15 disposed on the upper wall of the low-frequency center lower washer 14, a low-frequency ring magnet 16 disposed on the inner wall of the low-frequency housing 11, and a low-frequency ring washer 17 disposed on the upper wall of the low-frequency ring magnet 16. The low-frequency center lower magnet and the low-frequency upper magnet form a low-frequency magnetic circuit gap 18 with the low-frequency ring magnet 16. The upper wall of the bracket 3 is provided with the low-frequency diaphragm 19, and the low-frequency diaphragm 19 is provided with a low-frequency voice coil 101 that extends into the low-frequency magnetic circuit gap 18. The low-frequency center magnet 15 is attached to the magnetic guide frame 30 via the low-frequency voice coil 101. The connecting part 311 is installed on the side wall of the low-frequency housing 11. This low-frequency unit 1 is one embodiment. Of course, improvements can also be made based on the actual design.

[0024] That is, the low-frequency magnetic circuit assembly, the low-frequency voice coil 101 (driving assembly), and the vibration assembly (i.e., the low-frequency diaphragm 19).

[0025] Specifically, the low-frequency housing 11 is made of plastic material, and the low-frequency housing 11 is integrally injection molded with the low-frequency ring-shaped washer. The low-frequency voice coil 101 is provided with two integrally injection-molded low-frequency solder feet. The two low-frequency solder feet are electrically connected to the positive and negative terminals of the low-frequency voice coil 101, respectively.

[0026] Specifically, the overall thickness of the low-frequency unit 1 can be reduced by using a one-piece injection molding design. At the same time, the low-frequency toroidal washer and low-frequency solder feet can be injection molded in one piece, which can reduce resonance and assembly processes. This also improves structural stability. The low-frequency toroidal washer 17 can provide good support and magnetic conductivity.

[0027] Specifically, the low-frequency welding feet and the low-frequency annular washer are integrally injection molded from two sheets that are staggered and stacked. The low-frequency welding feet are staggered in both the height and radial directions, and the mating or connecting positions are then cut. The two low-frequency annular washers have two symmetrical clearance grooves, and the upper ends of the low-frequency welding feet are located in the clearance grooves.

[0028] Specifically, the high-frequency unit 2 includes a high-frequency U-shaped iron 21 with a high-frequency cavity, a high-frequency central magnet 22 disposed within the high-frequency U-shaped iron 21, a high-frequency ring magnet 23 disposed on the inner wall of the high-frequency U-shaped iron 21, and a high-frequency diaphragm 24 disposed on the upper wall of the high-frequency U-shaped iron 21. A high-frequency magnetic circuit gap 27 is provided between the high-frequency center magnet 22 and the high-frequency ring magnet 23; The lower wall of the high-frequency diaphragm 24 is provided with a high-frequency center washer 25. The high-frequency center washer 25 is attached to the high-frequency diaphragm 24. The bottom wall of the high-frequency center washer 25 is provided with a high-frequency voice coil 26, which is tangent to the high-frequency magnetic circuit gap 27, i.e., the high-frequency magnetic circuit assembly, the high-frequency voice coil 26 (driving assembly) and the vibration assembly (i.e., the high-frequency diaphragm 24).

[0029] The high-frequency magnetic circuit gap is provided with an upward magnetic shear force. In another design, the center washer of the Gaping is placed on the high-frequency diaphragm, changing the design of the existing high-frequency unit, in which the high-frequency magnetic circuit gap is extremely small.

[0030] Specifically, the high-frequency center magnet 22 and the high-frequency ring magnet 23 are coaxial and at the same height, and the high-frequency voice coil 26 is located above the high-frequency magnetic circuit gap 27, thereby ensuring a uniform distribution of magnetic flux direction.

[0031] Specifically, the U-shaped iron has a notch 4 on one side, and the notch 4 has two spaced-apart high-frequency welding feet 5. The two high-frequency solder feet 5 are connected to the positive and negative terminals of the high-frequency voice coil 26, respectively. The positioning frame 31 is used to install the high-frequency cable 51 and the low-frequency cable 52 of the high-frequency solder foot 5 and the low-frequency solder foot.

[0032] In actual headphone speaker installation, The placement of cables also greatly affects the sound quality. Therefore, the placement of the positioning bracket 31 can effectively avoid resonance problems and improve the sound quality of the coaxial speaker.

[0033] The high-frequency magnetic circuit components (i.e., magnet and washer) and low-frequency magnetic circuit components (i.e., magnet and washer) of high-frequency unit 2 and low-frequency unit 1 are coaxially arranged. The difference from the existing design is the arrangement of the magnetic guide frame 30. At the same time, high-frequency unit 2 and low-frequency unit 1 are preferably circular in shape, but can also be elliptical in shape.

[0034] The BL value, or electromechanical coupling coefficient, is an important parameter in acoustics used to describe the performance of acoustic transducers such as loudspeakers and microphones. It comprehensively considers the geometry of the magnetic circuit, the magnetic properties of the permanent magnet material, and the electrical parameters of the coil. The formula for calculating the BL value is: = × BL=B×L Where B is the magnetic flux density and L is the effective length of the voice coil. In loudspeakers, a high BL value indicates the use of high-performance permanent magnet materials and an appropriate coil length in the magnetic circuit design. This allows for more efficient conversion of electrical energy into sound energy, thereby improving the loudspeaker's sensitivity and power handling capabilities.

[0035] In practical applications, a larger BL value can enhance the driving force of the loudspeaker, enabling it to produce a higher sound pressure level. At the same time, the BL value also affects the loudspeaker's frequency response and distortion.

[0036] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A forward-facing coaxial loudspeaker, characterized by include: A low-frequency unit, wherein a low-frequency diaphragm is provided on the upper wall of the low-frequency unit; A high-frequency unit is located above the low-frequency unit, and a high-frequency diaphragm is provided on the upper wall of the high-frequency unit. The low-frequency diaphragm and the high-frequency diaphragm are oriented in the same direction and are coaxially arranged; The bracket extends from the low-frequency unit to the axial position of the low-frequency diaphragm and fits against each other, while the high-frequency unit is located on the upper wall of the bracket.

2. The positive coaxial loudspeaker of claim 1, wherein: The support includes a magnetic guide frame, which is disposed on the top wall of the low-frequency diaphragm and the bottom wall of the high-frequency unit. The magnetic guide frame can apply a downward magnetic force to the low-frequency magnetic circuit assembly of the low-frequency unit. The magnetic guide frame can apply an upward magnetic guiding force to the high-frequency magnetic circuit components of the high-frequency unit.

3. The forward-facing coaxial loudspeaker of claim 2, wherein: The magnetic guide frame is a hollow column, and the bottom wall of the magnetic guide frame is attached to the middle of the top wall of the low-frequency diaphragm.

4. The forward coaxial loudspeaker of claim 3, wherein: The bracket also includes a positioning frame, which includes a connecting part and a support part extending horizontally from the connecting part. The lower end of the connecting part is located on the outer wall of the low-frequency unit.

5. The forward coaxial loudspeaker of claim 4, wherein: The support portion has a stepped section that extends into the hollow column. The support portion is fixed to the magnetic guide frame by adhesive or ultrasonic welding. The bottom wall of the magnetic guide frame is bonded to the low-frequency diaphragm with adhesive, and an inner groove is provided at the position where the low-frequency diaphragm is bonded to the magnetic guide frame. The connecting part is bonded to the low-frequency unit through a slot.

6. The forward coaxial loudspeaker of claim 5, wherein: The low-frequency unit includes a low-frequency housing, a bottom washer located at the bottom of the low-frequency housing, a low-frequency center lower magnet located in the middle of the bottom washer, a low-frequency center lower washer located on the upper wall of the low-frequency center lower magnet, a low-frequency center upper magnet located on the upper wall of the low-frequency center lower washer, a low-frequency ring magnet located on the inner wall of the low-frequency housing, and a low-frequency ring washer located on the upper wall of the low-frequency ring magnet. The low-frequency center lower magnet and the low-frequency upper magnet form a low-frequency magnetic circuit gap with the low-frequency ring magnet. The upper wall of the bracket is provided with the low-frequency diaphragm, and the low-frequency diaphragm is provided with a low-frequency voice coil that extends into the low-frequency magnetic circuit gap. The low-frequency center magnet is attached to the magnetic guide frame via a low-frequency voice coil. The connecting part is installed on the side wall of the low-frequency housing.

7. The forward coaxial loudspeaker of claim 6, wherein: The low-frequency housing is made of plastic material, and the low-frequency housing and the low-frequency ring-shaped washer are integrally injection molded. The low-frequency voice coil has two integrally injection-molded low-frequency solder feet, and the two low-frequency annular washer has two symmetrical clearance grooves. The upper end of the low-frequency solder feet is located at the clearance groove. The two low-frequency solder feet are electrically connected to the positive and negative terminals of the low-frequency voice coil, respectively.

8. The positive coaxial loudspeaker of claim 7, wherein: The low-frequency solder feet and the low-frequency ring washer are integrally injection molded from two sheets that are staggered and stacked together. The low-frequency solder feet are staggered in the height and radial directions.

9. The positive coaxial loudspeaker of claim 6, wherein: The high-frequency unit includes a high-frequency U-shaped iron with a high-frequency cavity, a high-frequency central magnet disposed inside the high-frequency U-shaped iron, a high-frequency ring magnet disposed on the inner wall of the high-frequency U-shaped iron, and a high-frequency diaphragm disposed on the upper wall of the high-frequency U-shaped iron. A high-frequency magnetic circuit gap is provided between the high-frequency center magnet and the high-frequency ring magnet, and the high-frequency magnetic circuit gap is provided with an upward magnetic shear force. The lower wall of the high-frequency diaphragm is provided with a high-frequency central washer. The high-frequency center washer is attached to the high-frequency diaphragm. The bottom wall of the high-frequency center washer is provided with a high-frequency voice coil, and the high-frequency voice coil and the high-frequency magnetic circuit are tangent to each other.

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