Audio cavity with hollow structure

Abstract

The invention discloses an audio cavity with a hollow structure, and belongs to the technical field of audio equipment. The cavity comprises an outer wall, inner and outer wall connecting structures and an inner wall, the inner wall, the outer wall and the inner and outer wall connecting structures surround to form an air chamber, the inner wall, the outer wall and the inner and outer wall connecting structures are of thin-wall structures, the thickness of the air chamber is 2-8 times that of the inner wall, and the distance between the adjacent inner and outer wall connecting structures is 2-8 times that of the inner and outer wall connecting structures. The air chamber can be in various shapes and can be combined to form a composite structure, and the appearance of the cavity is various. The composite material can be made of non-metal or metal materials through 3D printing, extrusion forming and other processes, and is suitable for various audio devices. According to the structure, resonance and vibration can be reduced, a sound wave propagation path is optimized, sound quality is improved, light weight is achieved, and the problem of application of an existing sound box shell material in a small sound box is effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of audio, and in particular to an audio cavity with a hollow structure. Background Art

[0002] When making speakers, common shell materials include solid wood and plastic, and some are made of aluminum alloy. Solid wood itself has good natural damping properties, which can effectively reduce resonance and vibration. Solid wood is mostly used in speakers with slightly larger volumes, while plastic is mostly used in small speakers (such as common Bluetooth speakers). Compared with solid wood and metal, plastic has lower hardness and density, so it is easier to vibrate and resonate, which makes the sound quality of small speakers poor. This can be clearly felt by touching the outer wall of the small speaker with your hand when the small speaker is playing. The use of solid wood or metal in small speakers will increase the weight of the speakers and make them inconvenient to carry. Usually, in order to reduce vibration, many plastic speakers will add reinforcement structures or lining materials, which will increase the weight of the small speakers, which is contrary to the original design intention of their lightweight and portable design.

[0003] In summary, the prior art lacks lightness and is not prone to vibration (better sound quality). Summary of the invention

[0004] The purpose of the present invention is to provide a hollow structure audio cavity, aiming to solve the problems existing in the existing speaker shell materials in small speaker applications, such as plastic materials are prone to vibration and resonance, solid wood or metal materials lead to increased weight and inconvenience in portability, etc., by optimizing the cavity structure to achieve lightweight while improving sound quality.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] The technical solution of the present invention first provides a hollow structure audio cavity, the structure of which includes:

[0007] The outer wall, the inner and outer wall connecting structure and the inner wall;

[0008] The outer wall and the inner wall are connected to each other through a plurality of inner and outer wall connecting structures, and two adjacent inner and outer wall connecting structures surround and form mutually separated air chambers; each air chamber has the same cross-sectional shape in a direction perpendicular to the height direction of the hollow structure audio cavity;

[0009] The hollow structure audio cavity has low impedance characteristics within the audio frequency range of 20Hz-20kHz to reduce obstacles to the propagation of sound waves. At the same time, the shape and size of the air chamber are optimized so that the sound waves can undergo multiple beneficial reflections and interferences therein, thereby improving the sound quality performance of the audio equipment.

[0010] Furthermore, the inner wall, outer wall and the inner and outer wall connection structure are all thin-walled structures; the thickness of the inner wall, outer wall and the inner and outer wall connection structure can be the same or different, and the thickness ratio of the three is (1-3): (1-3): (1-3), preferably the same thickness, that is, 1:1:1.

[0011] Furthermore, the distance between the inner wall and the outer wall (i.e., the thickness of the air chamber) is 2 to 8 times the thickness of the inner wall. By rationally designing the thickness and thin-wall structure of the air chamber, the propagation of sound waves in the cavity can be effectively controlled, sound quality distortion can be reduced, and the sound quality performance of the audio device can be improved.

[0012] Furthermore, the spacing between adjacent inner and outer wall connection structures is 2 to 8 times the thickness of the inner and outer wall connection structures, so as to ensure the strength of the structure and the stability of the cavity during use.

[0013] Furthermore, the cross-sectional shape of the air chamber is at least one of a rectangle, a triangle or a trapezoid. The inner angle of the triangular air chamber ranges from 30° to 120°, and the inner angle of the trapezoidal air chamber ranges from 60° to 150°. By designing such a specific angle ratio range, the reflection path and phase change of the sound wave in the air chamber are more conducive to the optimization of the sound quality and reduce the generation of adverse acoustic phenomena such as standing waves.

[0014] Furthermore, the air chamber of the hollow structure audio cavity has two or more cross-sectional structures, and the cross-sectional structures include: rectangle, triangle or trapezoid. This composite air chamber cavity structure with multiple shapes can meet different acoustic needs and equipment design requirements.

[0015] Furthermore, the shape of the cavity can be rectangular, cylindrical, or a combination of rectangular and cylindrical shapes, which can meet the appearance design requirements of various audio devices.

[0016] Furthermore, one or more through holes are reserved in the middle of the inner and outer wall connection structure to connect two or more air chambers, thereby further optimizing the propagation characteristics of sound waves in the cavity.

[0017] Furthermore, the outer wall, the inner and outer wall connection structure and the inner wall are arranged in multiple layers along the thickness direction of the inner wall to form a multi-layer air chamber, which increases the volume of the shell, provides a better vibration isolation effect, and can be applied to slightly larger speakers.

[0018] Furthermore, a sound-absorbing material layer is provided inside the air chamber, and the sound-absorbing material layer fills the interior of the air chamber to absorb sound waves in a specific frequency range (above 500 Hz), further optimizing the sound quality and reducing noise interference.

[0019] Furthermore, a reinforcing rib structure is provided on the hollow structure audio cavity, and the reinforcing rib structure is distributed along the length direction or the width direction of the hollow structure audio cavity, so as to enhance the stability and strength of the hollow structure audio cavity.

[0020] Furthermore, the audio cavity can be made of non-metallic or metallic materials through 3D printing, extrusion molding and other processes, and is suitable for a variety of audio devices.

[0021] The technical solution of the present invention also provides an application of the hollow structure audio cavity, which can be applied to a variety of audio devices such as portable speakers, headphones or in-ear headphones. A speaker is arranged inside the hollow structure audio cavity to reduce the vibration generated by the speaker; and the volume of the air chamber can be adjusted according to actual needs to adapt to the usage scenarios and acoustic requirements of different devices.

[0022] Compared with the prior art, this application has at least the following advantages:

[0023] (1) Without excessively increasing the weight of the speaker, the vibration amplitude of the speaker is reduced, and the sound quality is better. It helps to isolate the vibration of the speaker unit inside the speaker, preventing the vibration from being transmitted to the surrounding environment, thereby improving the clarity and accuracy of the sound.

[0024] (2) The vibration control of the speaker can also improve the frequency response, ensure that the sound of each frequency can be output in a balanced manner, reduce the fluctuation of low-frequency response, and make the music sound more natural and delicate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the cross-sectional structure of a hollow structure audio cavity;

[0026] Figure 2 It is a schematic diagram of the structure of a hollow structure audio cavity speaker;

[0027] Figure 3 It is a schematic diagram of a cylindrical cavity structure of a hollow structure audio cavity;

[0028] Figure 4 It is a schematic diagram of the communication structure between air chambers;

[0029] Reference numerals:

[0030] 101 outer wall, 102 air chamber, 103 inner and outer wall connection structure, 104 inner wall, 105 fixing screw hole;

[0031] 201 through hole. DETAILED DESCRIPTION

[0032] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. Note that the following embodiments are merely illustrative in nature, and the present invention is not intended to limit its applicable objects or uses, and the present invention is not limited to the following embodiments.

[0033] Example 1

[0034] like Figure 1 and Figure 2 As shown, this embodiment provides a hollow structure audio cavity with a rectangular cavity shape.

[0035] The audio cavity comprises an outer wall 101, an air chamber 102, an inner and outer wall connecting structure 103 and an inner wall 104. The outer wall 101, the inner and outer wall connecting structure 103 and the inner wall 104 are all of the same thickness.

[0036] The outer wall 101 and the inner wall 104 are made of plastic material and made of thin-walled structure, which are connected by the inner and outer wall connecting structure 103 to form a sealed air chamber 102. The cross section of the air chamber 102 is designed to be a rectangular structure, and the aspect ratio of the rectangle is 1.4:1. The shape of the air chamber 102 at the corner is designed to be a 1 / 4 ring, and the width of the ring is the same as the thickness of the air chamber 102. The spacing between the inner and outer wall connecting structures 103 is six times the wall thickness of the inner wall 104 to ensure the structural strength.

[0037] The audio cavity is a rectangular parallelepiped with dimensions of 80 mm in length, 80 mm in width and 65 mm in height. Figure 2 As shown, four fixing screw holes 105 are arranged inside the cavity, and the speaker is arranged in the inner cavity of the hollow structure audio cavity through these fixing screw holes 105 .

[0038] In the present embodiment, injection molding or extrusion molding can be selected in the batch production process, and 3D printing can be directly used for overall printing in the functional verification stage.

[0039] Comparative Example 1

[0040] The external dimensions of this comparative example are the same as those of the cavity in Example 1, except that the cavity structure of this example is not hollow, that is, there is no inner and outer wall connecting structure 103 between the inner wall 104 and the outer wall 101 , and no air chamber 102 is formed.

[0041] Comparing the shock-absorbing effects of the two (Example 1 and Comparative Example 1), by playing an audio sound signal of a fixed frequency, it can be clearly felt that the shell of the non-hollow structure has a more obvious shell vibration between 200 Hz and 1000 Hz.

[0042] Example 2

[0043] In actual use, different appearances can be selected according to the speaker type, such as Figure 3 As shown, this embodiment manufactures an audio cavity with a cylindrical shape. The thickness of the outer wall 101, the inner and outer wall connection structure 103 and the inner wall 104 of the audio cavity with a cylindrical shape are the same, and are thin-walled structures. The cross-section of the air chamber 102 is designed to be a rectangular structure with an aspect ratio of 1.4:1. The spacing between the inner and outer wall connection structures 103 is six times the wall thickness of the inner wall 104 to ensure structural strength.

[0044] The audio cavity is cylindrical in shape, with dimensions of 80mm in diameter and 100mm in height.

[0045] In the present embodiment, injection molding or extrusion molding can be selected in the batch production process, and 3D printing can be directly used for overall printing in the functional verification stage.

[0046] Example 3

[0047] In this embodiment, based on the first embodiment, two or more air chambers 102 are connected through the through hole 201. Figure 4 The through hole 201 can further optimize the propagation characteristics of the sound wave in the cavity.

[0048] When processing in batches in factories, both injection molding and metal or non-metal extrusion molding technology are mature and can be selected according to needs.

[0049] The above embodiments are merely examples and do not limit the scope of the present invention. These embodiments can also be implemented in various other ways, and various omissions, substitutions, and changes can be made without departing from the technical concept of the present invention.

Claims

1. A hollow structure audio cavity, characterized in that: Its structure includes: An outer wall (101), an inner and outer wall connecting structure (103) and an inner wall (104), The outer wall (101) and the inner wall (104) are connected to each other via a plurality of inner and outer wall connecting structures (103); two adjacent inner and outer wall connecting structures (103) surround and form mutually separated air chambers (102); each air chamber (102) has the same cross-sectional shape in a direction perpendicular to the height of the hollow structure audio cavity; the inner wall (104), the outer wall (101), and the inner and outer wall connecting structure (103) are all thin-walled structures; the thickness ratio of the inner wall (104), the outer wall (101), and the inner and outer wall connecting structure (103) is (1-3): (1-3): (1-3); The hollow structure audio cavity has a low impedance characteristic within the audio frequency range of 20 Hz-20 kHz.

2. The hollow structure audio cavity according to claim 1, characterized in that: The distance between the inner wall (104) and the outer wall (101) is 2 to 8 times the thickness of the inner wall (104); the distance between adjacent inner and outer wall connecting structures (103) is 2 to 8 times the thickness of the inner and outer wall connecting structures (103).

3. The hollow structure audio cavity according to claim 1, characterized in that: The cross-sectional shape of the air chamber (102) is at least any one of a rectangle, a triangle or a trapezoid, wherein the inner angle of the triangular air chamber (102) ranges from 30° to 120°, and the inner angle of the trapezoidal air chamber (102) ranges from 60° to 150°.

4. The hollow structure audio cavity according to claim 1, characterized in that: The air chamber (102) of the hollow structure audio cavity has two or more cross-sectional structures, wherein the cross-sectional structures include: rectangle, triangle or trapezoid.

5. The hollow structure audio cavity according to claim 1, characterized in that: The shape of the hollow structure audio cavity is rectangular, cylindrical, or a combination of rectangular and cylindrical.

6. The hollow structure audio cavity according to claim 1, characterized in that: One or more through holes (201) are reserved in the middle of the inner and outer wall connection structure (103) to enable two or more air chambers to communicate with each other.

7. The hollow structure audio cavity according to claim 1, characterized in that: The outer wall (101), the inner and outer wall connecting structure (103) and the inner wall (104) are arranged in multiple layers along the direction of the inner wall thickness to form a multi-layer air chamber (102).

8. The hollow structure audio cavity according to claim 1, characterized in that: A sound absorbing material layer is arranged inside the air chamber (102), and the sound absorbing material layer fills the inside of the air chamber (102) and is used to absorb sound waves.

9. The hollow structure audio cavity according to claim 1, characterized in that: The hollow structure audio cavity is provided with a reinforcing rib structure, which is distributed along the length direction or the width direction of the hollow structure audio cavity and is used to enhance the stability and strength of the hollow structure audio cavity.

10. An application of a hollow structure audio cavity, characterized in that: The hollow structure audio cavity is applied to a portable speaker, a headphone or an in-ear earphone. A speaker is arranged inside the hollow structure audio cavity to reduce vibration generated by the speaker.

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