A loudspeaker resistant to thermal shock deformation

Abstract

The present application relates to the field of loudspeaker, specifically to a loudspeaker resistant to thermal shock deformation. It comprises a basket, a sound generating mechanism arranged in the basket, and a drum paper located above the sound generating mechanism; the drum paper edge is integrally formed with a folded ring, the outer edge of the folded ring is arranged on the mounting position of the basket, a limiting ring is arranged in the basket, and the limiting ring is located directly below the drum paper edge folded ring, and the radial dimension covers the deformation area of the drum paper folded ring. A preset working gap of 0.7mm is reserved between the upper surface of the limiting ring and the lower surface of the drum paper folded ring. The present application sets a limiting ring with a preset working gap below the folded ring, and constructs a double-mode structure with no interference in normal working and strong support in negative pressure working condition. The limiting ring only provides rigid support to the folded ring when the temperature shock causes the negative pressure in the inner cavity and the collapsed displacement of the folded ring exceeds the normal vibration stroke, and prevents it from continuing to deform, thereby solving the damage problem under thermal shock without affecting the acoustic characteristics of the folded ring.

Description

Technical Field

[0001] This invention relates to the field of loudspeakers, and more particularly to a loudspeaker resistant to thermal shock deformation. Background Technology

[0002] Closed-box loudspeakers, also known as sealed enclosures or acoustically suspended enclosures, are a basic and classic design. Their core principle is mounting the speaker unit within a completely sealed enclosure. The air inside the enclosure is completely sealed. As the speaker diaphragm moves forward and backward, the air inside the enclosure is compressed and expanded, forming an air cushion. This air cushion exerts a reaction force on the diaphragm, acting like a spring to help control the diaphragm's movement.

[0003] In automotive and other applications, closed-box speaker enclosures must withstand rigorous temperature shock tests (such as immersing in 0°C ice water immediately after reaching 95°C). During the test, the air inside the enclosure contracts rapidly as the temperature drops, creating a negative pressure environment. This can easily cause the diaphragm surround to collapse inward, deform permanently, or even crack, resulting in speaker failure. Summary of the Invention

[0004] The purpose of this invention is to address the problems of inward collapse, permanent deformation, and even cracking at the folded ring of the diaphragm in the prior art, and to propose a loudspeaker resistant to thermal shock deformation.

[0005] The technical solution of the present invention is as follows: A loudspeaker resistant to thermal shock deformation includes a frame, a sound-generating mechanism disposed within the frame, and a diaphragm located above the sound-generating mechanism; the edge of the diaphragm is integrally formed with a folded ring, the outer edge of the folded ring is disposed at the mounting position of the frame, and a limiting ring is disposed within the frame, the limiting ring being located directly below the folded ring on the edge of the diaphragm, and its radial dimension covering the deformation area of ​​the folded ring of the diaphragm.

[0006] Preferably, the limiting ring and the basin frame are integrally injection molded, and the limiting ring has an annular protrusion structure.

[0007] Preferably, a working gap is reserved between the upper surface of the limiting ring and the lower surface of the paper folding ring, which is greater than the maximum downward vibration displacement of the paper folding ring during normal operation.

[0008] Preferably, the reserved working gap is 0.7mm.

[0009] Preferably, a dust cap is installed at the middle position of the drum paper.

[0010] Preferably, the sound-generating mechanism includes a U-shaped iron mounted at the bottom of the basket, a magnet mounted on the inner plane of the U-shaped iron, a washer mounted on the upper surface of the magnet, a spider mounted inside the basket and above the U-shaped iron, and a voice coil mounted on the inner wall of the spider's central hole.

[0011] Preferably, a back cover is provided at the bottom of the basin stand, which seals the rear of the basin stand to form a closed box structure.

[0012] Preferably, an equalizer is installed on the top of the basin stand, and foam is installed around the equalizer.

[0013] Compared with the prior art, the present invention has the following beneficial technical effects: 1. Precisely solve common problems in the industry: Instead of simply and crudely increasing the rigidity of materials, the design directly addresses the physical essence of negative pressure collapse during thermal shock of the closed box, thus structurally offsetting the effect of air contraction inside the cavity; 2. Full coverage of testing scenarios: Directly benchmarked against the most stringent 95℃→0℃ ice water impact test for car speakers, it can solve this type of environmental reliability problem in one go, and the product yield and consistency will be significantly improved; 3. Perfect balance between structure and acoustics: By reserving a 0.7mm working gap, the function of the limiting ring is strictly limited to the negative pressure collapse condition, which does not affect the folding vibration stroke when the speaker is working normally. 4. Zero sacrifice in acoustic performance: No need to modify the surround material formula or increase the material hardness, so it will not have a negative impact on the speaker's core acoustic performance such as sensitivity, frequency response curve, and distortion, perfectly balancing reliability and sound quality. 5. Cost and process friendly: The limiting ring can be directly injection molded into the speaker frame, without the need for additional assembly processes or additional parts, and hardly increases manufacturing costs. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of one embodiment of the present invention; Figure 2 for Figure 1 Exploded view; Figure 3 This is a schematic diagram of the structure of the diaphragm and the limiting ring; Attached reference numerals: 1. Bass frame; 2. Drum; 3. U-shaped iron; 4. Limiting ring; 5. Magnet; 6. Washer; 7. Spider; 8. Voice coil; 9. Dust cap; 10. Back cover; 11. Equalizer; 12. Foam. Detailed Implementation

[0015] Example 1; as Figures 1-3As shown, the present invention proposes a loudspeaker resistant to thermal shock deformation, comprising a frame 1, a sound-generating mechanism disposed within the frame 1, and a diaphragm 2 located above the sound-generating mechanism; the edge of the diaphragm 2 is integrally formed with a folded ring, the outer edge of which is bonded to the mounting position of the frame 1; a limiting ring 4 is disposed within the frame 1, the limiting ring 4 being an annular protrusion structure; the limiting ring 4 and the frame 1 are integrally injection molded; the limiting ring 4 is located directly below the folded ring at the edge of the diaphragm 2, and its radial dimension covers the deformation area of ​​the folded ring of the diaphragm 2; the frame 1, as the supporting skeleton of the entire loudspeaker, is preferably integrally injection molded from high-strength engineering plastics (such as PBT, PC+ABS, etc.), possessing good mechanical strength and dimensional stability.

[0016] Furthermore, a pre-set working gap of 0.7mm is reserved between the upper surface of the limiting ring 4 and the lower surface of the folding ring of the paper drum 2. This gap is larger than the maximum downward vibration displacement of the folding ring of the paper drum 2 during normal operation, thus avoiding interference. In the 95℃→0℃ ice water impact test, the air inside the chamber contracts rapidly, creating a momentary strong negative pressure. At this time, the folding ring will be pulled inward forcefully due to the loss of internal air support. Due to the presence of the limiting ring 4, the downward collapse stroke of the folding ring is strictly limited to within 0.7mm. Once it touches the limiting ring 4, it is physically blocked, avoiding permanent damage caused by excessive deformation.

[0017] Furthermore, an installation position is set in the middle of the drum paper 2, and a dust cap 9 is installed on the installation position. The dust cap 9 is used to prevent dust from entering the magnetic gap, while participating in the radiation of high-frequency sound waves and having a slight effect on the stiffness of the diaphragm.

[0018] In existing technologies, there are two common solutions to address negative pressure collapse: one is to increase the thickness of the surround or use a harder rubber material, but this significantly reduces the speaker's sensitivity and negatively impacts high-frequency response; the other is to add a complex airflow buffer mechanism or reinforcing ribs inside the enclosure, which is costly and space-consuming. This application takes a different approach, starting from a structural mechanics perspective, and precisely solves the physical problem of negative pressure collapse using only a limiting ring 4 integrated with the frame, without changing the material of the diaphragm 2, adding any extra parts, or increasing costs, achieving a reliability improvement with zero acoustic sacrifice.

[0019] Example 2; as Figures 1-2As shown, this invention proposes a speaker resistant to thermal shock deformation. Compared to Embodiment 1, this embodiment details the structure of the sound-generating mechanism. The sound-generating mechanism includes a U-shaped iron 3 mounted at the bottom of the frame 1, a magnet 5 mounted on the inner plane of the U-shaped iron 3, a washer 6 mounted on the upper surface of the magnet 5, a spring 7 mounted inside the frame 1 and above the U-shaped iron 3, and a voice coil 8 mounted on the inner wall of the central hole of the spring 7. Specifically, the bottom of the U-shaped iron 3 is fixed to the mounting position of the frame 1 by adhesive bonding, the bottom of the magnet 5 is bonded to the inner plane of the U-shaped iron 3 with glue, the bottom of the washer 6 is bonded to the magnet 5 with glue, and the spring 7 is fixed to the mounting position of the frame 1 by adhesive bonding. The voice coil 8 is fixed to the center hole of the spider 7 by adhesive bonding; the U-shaped iron 3, the magnet 5, and the washer 6 together constitute the magnetic circuit system of the loudspeaker; the spider 7 keeps the voice coil 8 in the center position in the magnetic gap, preventing it from shifting to the left or right and colliding with it. Together with the surround, it allows the voice coil 8 to vibrate freely on the axis, but restricts its lateral movement; the voice coil 8 is the driving unit of the entire system. When the audio current passes through the voice coil 8, it generates a force in the magnetic field, causing it to move up and down. It is the only component that converts electrical energy into mechanical motion; the drum 2 is the sound radiation unit of the system. It is driven by the voice coil 8. Its large-area vibration directly pushes the air to produce the sound we hear. Its shape and material greatly affect the sound quality.

[0020] Example 3; as Figures 1-2 As shown, the present invention proposes a speaker resistant to thermal shock deformation. Compared with Embodiment 1 or Embodiment 2, this embodiment supplements the introduction of necessary auxiliary structures. Specifically, a rear cover 10 is provided at the bottom of the frame 1. In an optional embodiment, the rear cover 10 is glued to the bottom mounting position of the frame 1. The rear cover 10 is used to seal the rear of the frame 1, ensuring the integrity of the closed box structure and forming the correct acoustic load of the rear cavity. Specifically, the function of the rear cover 10 is to completely seal the rear of the frame 1, so that a closed air cavity is formed behind the speaker vibration system. When the diaphragm moves forward, the air in the rear cavity is compressed; when it moves backward, the air in the rear cavity is stretched. The stiffness coefficient of this air spring is an important component of the overall compliance of the speaker, directly affecting the resonant frequency and low-frequency response. By precisely designing the rear cavity volume, the low-frequency performance of the speaker in a closed enclosure can be precisely tuned. In the 95℃→0℃ ice water impact test, the sealing of the rear cover 10 ensures that the rapid contraction of the air inside the enclosure from high temperature to low temperature will create a strong negative pressure, which is the root cause of the surround collapse. This embodiment uses the limiting ring 4 to deal with this impact. Therefore, the sealing reliability of the rear cover 10 is crucial. This embodiment uses adhesive instead of clips or screws for fixing, which can effectively prevent the rear cover from loosening or failing to seal due to thermal expansion and contraction under extreme temperature differences, ensuring the severity of the test conditions and the effectiveness of the limiting ring protection mechanism.

[0021] An equalizer 11 is installed on the top of the speaker frame 1, and foam 12 is installed around the equalizer 11. In an optional embodiment, the equalizer 11 is fixed to the mounting position of the speaker frame 1 by screws. If it is a multi-unit speaker, the equalizer 11 is used to distribute signals of different frequency bands to the corresponding units. If it is a single-unit speaker, the equalizer 11 is a simple compensation and circuit protection. The foam 12 wrapped around the equalizer 11 has multiple functions: first, it acts as a mechanical buffer to absorb vibration and impact during speaker installation and prevent the equalizer 11 from colliding with the speaker frame 1 or the housing and causing abnormal noise; second, it plays a certain role in acoustic damping, absorbing high-frequency standing waves that may be generated in the rear cavity and improving the purity of mid and low frequencies; and third, it acts as a sealing filler during installation to prevent air leakage in the rear cavity.

[0022] In summary, this invention precisely addresses common industry challenges. Instead of simply increasing material rigidity, it directly addresses the fundamental physical issue of negative pressure collapse during thermal shock in closed-box enclosures, structurally mitigating the impact of air contraction within the cavity. It directly meets the most stringent 95℃→0℃ ice water shock test for automotive speakers, resolving environmental reliability issues in one go, significantly improving product yield and consistency. By reserving a 0.7mm working gap, the function of the limiting ring 4 is strictly limited to the negative pressure collapse condition, completely unaffected by the speaker's normal surround vibration stroke. No modification to the surround material formula or increase in material hardness is required, thus avoiding negative impacts on the speaker's core acoustic performance such as sensitivity, frequency response curve, and distortion, perfectly balancing reliability and sound quality. The limiting ring 4 can be directly injection molded integrally with the speaker frame 1, requiring no additional assembly processes or parts, resulting in virtually no increase in manufacturing costs.

[0023] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A loudspeaker resistant to thermal shock deformation, comprising a frame (1), a sound-generating mechanism disposed within the frame (1), and a diaphragm (2) located above the sound-generating mechanism; characterized in that, The edge of the drum paper (2) is integrally formed with a folded ring. The outer edge of the folded ring is set on the mounting position of the basin frame (1). A limiting ring (4) is set inside the basin frame (1). The limiting ring (4) is located directly below the edge folded ring of the drum paper (2), and its radial dimension covers the deformation area of ​​the folded ring of the drum paper (2).

2. The loudspeaker resistant to thermal shock deformation according to claim 1, characterized in that, The limiting ring (4) is integrally injection molded with the basin frame (1), and the limiting ring (4) is a ring-shaped protrusion structure.

3. The loudspeaker resistant to thermal shock deformation according to claim 1, characterized in that, A working gap is reserved between the upper surface of the limiting ring (4) and the lower surface of the folding ring of the drum paper (2). This gap is greater than the maximum downward vibration displacement of the folding ring of the drum paper (2) during normal operation.

4. The loudspeaker resistant to thermal shock deformation according to claim 1, characterized in that, The reserved working gap is 0.7mm.

5. The loudspeaker resistant to thermal shock deformation according to claim 1, characterized in that, A dust cap (9) is placed in the middle of the drum paper (2).

6. The loudspeaker resistant to thermal shock deformation according to claim 1, characterized in that, The sound-generating mechanism includes a U-shaped iron (3) installed at the bottom of the basket (1), a magnet (5) installed on the inner plane of the U-shaped iron (3), a washer (6) installed on the upper surface of the magnet (5), a spider (7) installed inside the basket (1) and above the U-shaped iron (3), and a voice coil (8) installed on the inner wall of the hole of the spider (7).

7. The loudspeaker resistant to thermal shock deformation according to claim 1, characterized in that, The bottom of the basin stand (1) is provided with a back cover (10), which seals the back of the basin stand (1) to form a closed box structure.

8. The loudspeaker resistant to thermal shock deformation according to claim 1, characterized in that, An equalizer (11) is installed on the top of the basin stand (1), and foam (12) is installed around the outer periphery of the equalizer (11).

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