An embedded soft sound absorbing material outer magnetic circuit loudspeaker

Abstract

The utility model relates to technical fields especially relates to a kind of outer magnetic circuit loudspeaker of embedded soft sound-absorbing material.Its technical scheme includes: support shell and sound-absorbing unit, the top of support shell is provided with vibrating plate, the outer edge of vibrating plate is connected with support shell, the lower vibrating plate is provided with voice coil and is driven by magnetic circuit mechanism, the lower magnetic circuit mechanism is provided with baffle, the sound-absorbing unit is embedded between magnetic circuit mechanism and baffle, the sound-absorbing unit is divided into inner ring surface and outer ring surface along radial direction, the thickness of outer ring surface is greater than the thickness of inner ring surface, the sound-absorbing unit includes soft sound-absorbing layer, microporous layer arranged on the upper soft sound-absorbing layer and backing layer arranged on the lower soft sound-absorbing layer.The utility model embeds three-layer composite sound-absorbing unit between magnetic circuit mechanism and baffle, realizes wide-band sound wave absorption and cavity resonance suppression, significantly improves the acoustic purity and high-frequency response smoothness of loudspeaker.

Description

Technical Field

[0001] This utility model relates to the technical field, and in particular to an external magnetic circuit loudspeaker with embedded soft sound-absorbing material. Background Technology

[0002] As a common electroacoustic conversion device, the performance stability and sound quality of loudspeakers are greatly affected by their internal structure and materials. Existing external magnetic circuit loudspeakers generally consist of a support shell, a vibration system, and a magnetic circuit system, with a voice coil moving in a magnetic field to drive a diaphragm to produce sound. However, in traditional structures, the internal space of the loudspeaker is relatively compact, causing sound waves to reflect and interfere between the magnetic circuit mechanism and the baffle. This easily leads to standing wave effects in the mid-to-high frequency range, causing fluctuations in the frequency response curve and thus affecting the clarity and layering of the sound quality.

[0003] To mitigate the aforementioned problems, some technical solutions attempt to add sound-absorbing materials to the bottom of the speaker or the inside of the housing to reduce reflected sound energy. However, since most sound-absorbing materials are single-layer or rigid material structures, their absorption effect on sound waves of different frequencies is limited, especially in the low-frequency range where there is still insufficient absorption. At the same time, traditional sound-absorbing materials are often fixed by attaching or filling, which makes it difficult to form a tight bond with the magnetic circuit mechanism and baffles. They are prone to falling off or aging due to vibration, thus affecting their service life and acoustic stability.

[0004] To address this issue, we propose an external magnetic circuit loudspeaker with embedded soft sound-absorbing material to solve the existing problems. Utility Model Content

[0005] The purpose of this invention is to address the problems existing in the background technology by proposing an external magnetic circuit loudspeaker with embedded soft sound-absorbing material.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an external magnetic circuit loudspeaker with embedded soft sound-absorbing material, comprising a support shell and a sound-absorbing unit, wherein a vibrating plate is disposed above the support shell, the outer edge of the vibrating plate is connected to the support shell, a voice coil is disposed below the vibrating plate and driven by a magnetic circuit mechanism, and a baffle is disposed below the magnetic circuit mechanism;

[0007] The sound-absorbing unit is embedded between the magnetic circuit mechanism and the baffle. The sound-absorbing unit is divided into an inner ring surface and an outer ring surface in the radial direction. The thickness of the outer ring surface is greater than the thickness of the inner ring surface. The sound-absorbing unit includes a soft sound-absorbing layer, a microporous layer disposed on the soft sound-absorbing layer, and a backing layer disposed below the soft sound-absorbing layer.

[0008] Preferably, the magnetic circuit mechanism includes a magnet, a T-iron, and a washer. A copper sleeve is provided at the bottom end of the voice coil, and the washer is provided on the outer periphery of the copper sleeve. The magnet and the T-iron are provided below the washer.

[0009] Preferably, a tuning hole is provided on the side wall of the support shell, and a tuning paper is attached to the tuning hole.

[0010] Preferably, the outer side of the bracket housing is provided with a PCB board, and the PCB board integrates a control circuit connected to the voice coil.

[0011] Preferably, the microporous layer facing the vibrating plate is made of microporous polyurethane membrane, the soft sound-absorbing layer is disposed in the middle and is made of foamed polyurethane, and the backing layer facing the baffle is made of thin rubber membrane. The microporous layer, soft sound-absorbing layer and backing layer are formed by hot pressing.

[0012] Preferably, the backing layer of the sound-absorbing unit is bonded and fixed to the inner surface of the baffle, and the microporous layer of the sound-absorbing unit is in contact with the bottom surface of the T-iron, so that the sound-absorbing unit is tightly pressed between the magnetic circuit mechanism and the baffle.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] The sound-absorbing unit of this utility model is embedded between the magnetic circuit mechanism and the baffle to form an independent acoustic buffer zone, which can effectively absorb the sound wave energy reflected from the vibrating plate to the bottom, reduce the standing wave and resonance phenomenon of the internal cavity, and significantly improve the smoothness of the mid-high frequency response of the speaker.

[0015] The sound-absorbing unit has an inner and outer ring surface arranged radially, with the outer ring surface being thicker than the inner ring surface. This allows the impedance of the sound-absorbing layer to gradually transition, improving the matching absorption effect of sound waves in different frequency bands and achieving wide-band sound absorption performance. The sound-absorbing unit adopts a three-layer composite structure of a microporous layer, a soft sound-absorbing layer, and a backing layer. The microporous layer provides sound wave incident permeability, the soft sound-absorbing layer is responsible for energy dissipation, and the backing layer plays a role in reflection and support. After being hot-pressed and composited, the three components have high integrity, excellent durability, and are not easy to delaminate or fall off.

[0016] The backing layer of the sound-absorbing unit is bonded and fixed to the baffle, and the microporous layer is in contact with the bottom surface of the T-iron, realizing double-sided clamping assembly, so that the sound-absorbing unit can remain stable in a long-term vibration environment and will not loosen or produce noise.

[0017] Through a soft composite sound-absorbing structure and a reasonable embedding position design, the speaker retains good elasticity response in the low-frequency range, while significantly reducing sound wave interference in the mid-to-high frequency range, thereby improving the clarity and fidelity of the sound. Attached Figure Description

[0018] Figure 1 This is a cross-sectional structural diagram of the present invention;

[0019] Figure 2This is a bottom view of the structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the sound-absorbing unit structure of this utility model;

[0021] Figure 4 This is a schematic diagram of the layered sound-absorbing unit of this utility model.

[0022] Figure label:

[0023] 1. Support shell; 2. Tuning paper; 3. Magnet; 4. T-iron; 5. Sound-absorbing unit; 501. Outer ring surface; 502. Inner ring surface; 503. Microporous layer; 504. Soft sound-absorbing layer; 505. Backing layer; 6. Baffle; 7. Copper sleeve; 8. PCB board; 9. Voice coil; 10. Vibrating plate; 11. Washer. Detailed Implementation

[0024] 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.

[0025] Example 1

[0026] like Figures 1-4 As shown, the present invention proposes an external magnetic circuit loudspeaker with embedded soft sound-absorbing material, including a support shell 1 and a sound-absorbing unit 5. A diaphragm 10 is provided above the support shell 1, and the outer edge of the diaphragm 10 is connected to the support shell 1. A voice coil 9 is provided below the diaphragm 10. The voice coil 9 is driven by a magnetic circuit mechanism. A baffle 6 is provided below the magnetic circuit mechanism. The magnetic circuit mechanism includes a magnet 3, a T-iron 4 and a washer 11. A copper sleeve 7 is provided at the bottom of the voice coil 9. The outer periphery of the copper sleeve 7 covers the washer 11. The magnet 3 and the T-iron 4 are arranged in sequence below the washer 11 to form a complete external magnetic circuit structure.

[0027] The sound-absorbing unit 5 is embedded between the magnetic circuit mechanism and the baffle 6. The sound-absorbing unit 5 is divided into an outer ring surface 501 and an inner ring surface 502 along the radial direction. The outer ring surface 501 is thicker than the inner ring surface 502 in the area near the magnetic circuit frame, so that the outer ring surface 501 forms a stronger sound wave absorption effect in the high-frequency energy-dense area. The inner ring surface 502 is close to the center area of ​​the vibrating plate 10. It maintains the sound wave transmission sensitivity through a thinner structure, thereby forming a balanced energy absorption distribution between different frequency bands.

[0028] The sound-absorbing unit 5 is composed of three layers stacked sequentially: a microporous layer 503, a soft sound-absorbing layer 504, and a backing layer 505. The microporous layer 503 is located at the top, facing the vibrating plate 10, and is made of microporous polyurethane membrane material. The membrane surface is covered with a large number of micro-pores, which can form multiple sound energy diffusion paths during high-frequency vibration and reduce reflected noise.

[0029] The soft sound-absorbing layer 504 is located in the middle and is made of foamed polyurethane material. This layer has high elasticity and porosity. It absorbs sound wave energy through the microbubble structure inside the material and forms multiple scattering in the high and mid frequency bands, so that the noise energy entering the cavity gradually attenuates. The soft sound-absorbing layer 504 has a larger thickness in the outer ring surface 501 area, and the average pore size of the internal foam is slightly larger than that in the inner ring surface 502 area, so as to form a circumferential sound attenuation gradient.

[0030] The backing layer 505 is located at the bottom, facing the baffle 6, and is made of a thin rubber membrane. The backing layer 505 absorbs the reverse sound wave pressure from the bottom of the cavity through flexible damping and prevents airflow from directly penetrating the soft sound-absorbing layer 504, thereby enhancing the acoustic sealing and low-frequency stability of the overall structure.

[0031] The microporous layer 503, the soft sound-absorbing layer 504, and the backing layer 505 are formed by hot pressing, resulting in a strong interface bond and good airtightness. The three-layer structure forms a complete sound wave buffer system. When the sound-absorbing unit 5 is installed, the backing layer 505 is fixed to the inner surface of the baffle 6 with adhesive, and the upper surface of the microporous layer 503 is tightly attached to the bottom surface of the T-iron 4, so that the sound-absorbing unit 5 is firmly pressed between the magnetic circuit structure and the baffle 6 after assembly, forming an embedded acoustic energy-absorbing layer.

[0032] Example 2

[0033] like Figures 1-4 As shown, the present invention proposes an external magnetic circuit loudspeaker with embedded soft sound-absorbing material. Compared with Embodiment 1, this embodiment further includes: a tuning hole is opened on the side wall of the support shell 1, and a tuning paper 2 is attached to the outside of the tuning hole. The tuning paper 2 can fine-tune the acoustic characteristics of the loudspeaker by controlling the airflow and reflected sound energy.

[0034] A PCB board 8 is mounted on the outer side of the bracket housing 1. The PCB board 8 integrates a control circuit connected to the voice coil 9 to realize electrical signal input and driving functions. Through the above structural design, the sound absorption unit 5 is fixed in an embedded manner between the magnetic circuit mechanism and the baffle 6 to form a flexible sound absorption channel. While ensuring acoustic stability, it effectively reduces internal reflection noise and standing wave effect, and improves the overall acoustic performance and sound clarity of the loudspeaker.

[0035] The above specific embodiments are merely several preferred embodiments of this utility model. Based on the technical solution of this utility model and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

[0036] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A loudspeaker with an external magnetic circuit and embedded soft sound-absorbing material, comprising a support shell (1) and a sound-absorbing unit (5), characterized in that: A vibrating plate (10) is provided above the support shell (1). The outer edge of the vibrating plate (10) is connected to the support shell (1). A voice coil (9) is provided below the vibrating plate (10) and is driven by a magnetic circuit mechanism. A baffle (6) is provided below the magnetic circuit mechanism. The sound-absorbing unit (5) is embedded between the magnetic circuit mechanism and the baffle (6). The sound-absorbing unit (5) is divided into an inner ring surface (502) and an outer ring surface (501) in the radial direction. The thickness of the outer ring surface (501) is greater than the thickness of the inner ring surface (502). The sound-absorbing unit (5) includes a soft sound-absorbing layer (504), a microporous layer (503) disposed on the soft sound-absorbing layer (504), and a backing layer (505) disposed below the soft sound-absorbing layer (504).

2. The external magnetic circuit loudspeaker with embedded soft sound-absorbing material according to claim 1, characterized in that: The magnetic circuit mechanism includes a magnet (3), a T-iron (4) and a washer (11). A copper sleeve (7) is provided at the bottom of the voice coil (9). The washer (11) is provided on the outer periphery of the copper sleeve (7). The magnet (3) and the T-iron (4) are provided below the washer (11).

3. The external magnetic circuit loudspeaker with embedded soft sound-absorbing material according to claim 1, characterized in that: Tuning holes are provided on the side wall of the support shell (1), and tuning paper (2) is attached to the tuning holes.

4. The external magnetic circuit loudspeaker with embedded soft sound-absorbing material according to claim 1, characterized in that: The outer side of the bracket housing (1) is provided with a PCB board (8), and the PCB board (8) integrates a control circuit connected to the voice coil (9).

5. The external magnetic circuit loudspeaker with embedded soft sound-absorbing material according to claim 1, characterized in that: The microporous layer (503) faces the vibrating plate (10) and is made of microporous polyurethane membrane. The soft sound-absorbing layer (504) is located in the middle and is made of foamed polyurethane. The backing layer (505) faces the baffle (6) and is made of thin rubber membrane. The microporous layer (503), soft sound-absorbing layer (504) and backing layer (505) are formed by hot pressing.

6. A loudspeaker with an external magnetic circuit made of embedded soft sound-absorbing material according to claim 2, characterized in that: The backing layer (505) of the sound-absorbing unit (5) is bonded and fixed to the inner surface of the baffle (6), and the microporous layer (503) of the sound-absorbing unit (5) is in contact with the bottom surface of the T-iron (4), so that the sound-absorbing unit (5) is tightly pressed between the magnetic circuit mechanism and the baffle (6).

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