Sound cavity structure and electronic device

Abstract

Embodiments of the present application relate to the technical field of audio products, and disclose a sound cavity structure and an electronic device. The sound cavity structure comprises a cavity body. The cavity is internally provided with a front sound cavity and a rear sound cavity which are in communication with each other. A communication position between the front sound cavity and the rear sound cavity is used for disposing a loudspeaker, and the loudspeaker faces the front sound cavity. A sound outlet hole in communication with the outside is formed on a cavity wall of the front sound cavity. A sound transmission channel in communication with the sound outlet hole is provided within the front sound cavity, and the sound transmission channel is used for transmitting sound emitted by the loudspeaker to the outside. The sound transmission channel comprises a plurality of sub-channels arranged in a direction away from the center of the front sound cavity, and the lengths of the plurality of sub-channels gradually increase. Two adjacent sub-channels among the plurality of sub-channels are in communication with each other, and the sub-channel farthest from the center of the front sound cavity among the plurality of sub-channels is in communication with the sound outlet hole. The sound cavity structure and the electronic device provided by the embodiments of the present application can overcome the shortcomings of existing bass enhancement technologies, thereby enabling the electronic device to achieve the purpose of bass enhancement.

Description

Sound cavity structure and electronic device

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202410861932.9, filed on June 28, 2024, entitled “Sound cavity structure and electronic device”, which is incorporated by reference in its entirety. TECHNICAL FIELD

[0003] Embodiments of the present application relate to the technical field of audio products, and in particular to a sound cavity structure and an electronic device. BACKGROUND

[0004] With people's increasing experience of entertainment projects such as music, movies and games, the demand for low-frequency of electronic devices is also increasing. Electronic devices with good low-frequency effect can provide more full, deep and powerful low-frequency effect, add dynamic and momentum to music, and make the listener feel the power and charm of the music. Therefore, low-frequency plays a crucial role in improving the sound quality of electronic devices.

[0005] In order to ensure the low-frequency effect of electronic devices with a closed sound cavity structure, a larger rear sound cavity is needed. However, under the trend of miniaturization and lightness of electronic devices, the space of the rear sound cavity is limited. Therefore, some technologies for designing auxiliary structures in the limited rear sound cavity to enhance the low-frequency effect of electronic devices have gradually emerged. However, these low-frequency enhancement technologies not only enhance the low-frequency effect of electronic devices, but also bring other problems. Therefore, how to overcome the shortcomings of existing low-frequency enhancement technologies and develop technologies to enhance the low-frequency of electronic devices is a problem to be solved.

[0006] SUMMARY

[0007] The purpose of the embodiments of the present application is to provide a sound cavity structure and an electronic device that can overcome the shortcomings of existing low-frequency enhancement technologies and achieve the purpose of low-frequency enhancement of electronic devices.

[0008] To solve the above technical problems, the embodiments of the present application provide a sound cavity structure. The sound cavity structure includes a cavity. The cavity has a front sound cavity and a rear sound cavity that are in communication with each other, and the communication part of the front sound cavity and the rear sound cavity is used to set a loudspeaker, and the loudspeaker faces the front sound cavity. An acoustic hole in communication with the outside is formed on the cavity wall of the front sound cavity, and a sound propagation channel in communication with the acoustic hole is arranged in the front sound cavity, and the sound propagation channel is used to propagate the sound emitted by the loudspeaker to the outside. The sound propagation channel includes a plurality of sub-channels arranged in a direction away from the center of the front sound cavity, and the lengths of the plurality of sub-channels gradually increase, adjacent sub-channels in the plurality of sub-channels are in communication with each other, and the sub-channel farthest from the center of the front sound cavity in the plurality of sub-channels is in communication with the acoustic hole.

[0009] The embodiment of the present application further provides an electronic device comprising the sound cavity structure.

[0010] The sound cavity structure and the electronic device provided by the embodiment of the present application can form a sound propagation channel by arranging the sub-channels with gradient length and mutual communication in the front sound cavity of the cavity. The coupling resonance of the sound mode of the front sound cavity with the sound propagation channel and the structure mode of the loudspeaker can enhance the bass component of the electronic device. The cavity is easy to manufacture and can overcome the disadvantages of the existing bass enhancement technologies, such as insufficient bass under low frequency, high cost and sound tailing, so that the electronic device can achieve the purpose of bass enhancement.

[0011] In some embodiments, the sound propagation channel is uniformly distributed around the center of the front sound cavity, each sound propagation channel is arranged in a region provided with two edge portions and a plurality of isolation portions arranged in sequence along a direction away from the center of the front sound cavity between the two edge portions, a space between adjacent two isolation portions forms a sub-channel, and the plurality of sub-channels are sequentially connected in a head-to-tail manner. In this way, by arranging a plurality of sound propagation channels around the front sound cavity, the bass of the sound propagated by the electronic device to different directions can be enhanced.

[0012] In some embodiments, the cavity is arranged in a prismatic shape, each isolation portion is arranged in a flat plate shape, and each isolation portion is arranged in parallel with the side wall of the cavity, or each isolation portion comprises a first portion and a second portion connected with each other, and the first portion and the second portion of each isolation portion are arranged in parallel with different side walls of the cavity. In this way, by using isolation portions with different shapes, curved channels for sound propagation with different shapes can be formed in the front sound cavity.

[0013] In some embodiments, the sound propagation channel comprises a multi-layer structure arranged in layers along the axial direction of the loudspeaker, and each layer structure comprises a plurality of sub-channels; in the axial direction of the loudspeaker, the sub-channel at the sound propagation end point in each layer structure is connected with the sub-channel at the sound propagation start point in the next layer structure. In this way, a sound propagation channel with a longer length can be formed.

[0014] In some embodiments, the projection of the sound propagation channel along the axial direction of the loudspeaker is in a spiral shape. In this way, a curved channel for sound propagation in a spiral shape can be formed.

[0015] In some embodiments, the front sound cavity is provided with a plurality of isolation members around the same center, a space between adjacent two isolation members forms a sub-channel, each isolation member is provided with a notch, and adjacent two sub-channels are connected through the notch. In this way, a plurality of channels can be formed by a plurality of isolation members, and the plurality of channels can be connected through the notches on the isolation members to form a curved channel for sound propagation.

[0016] In some embodiments, the sound propagation channel is provided in the same direction with multiple sound propagation channels. In this way, multiple sound holes can be provided in the axial direction of the surround speaker to radiate sound in different directions.

[0017] In some embodiments, the sound propagation channel includes a first sound propagation channel and a second sound propagation channel located at the periphery of the first sound propagation channel, the first sound propagation channel and the second sound propagation channel each include multiple sub-channels provided in a direction away from the center of the front sound cavity, and a gap is provided between the first sound propagation channel and the second sound propagation channel. In this way, the sound modal density of the front sound cavity can be increased, thereby improving the bass enhancement effect.

[0018] In some embodiments, the cavity is provided with a central hole towards the center of the speaker, one end of the central hole is in communication with the front sound cavity, and the other end of the central hole is in communication with the outside. In this way, by providing a central hole in the sound propagation path of the forward direction of the speaker, the bass enhancement effect of the front sound cavity can be improved.

[0019] In some embodiments, the sound hole can be on any surface of the cavity wall of the front sound cavity. In this way, sound can be propagated in the desired direction. BRIEF DESCRIPTION OF DRAWINGS

[0020] One or more embodiments are illustrated by way of example in the figures that form a part of this patent document, these illustrative examples do not limit the embodiments and elements having the same reference numerals in different figures indicate like elements unless otherwise indicated. The figures in the drawings are not to scale and are provided merely for illustrating concepts of the embodiments.

[0021] FIG. 1 is a perspective view of an electronic device according to the prior art;

[0022] FIG. 2 is a cross-sectional view of the electronic device according to the prior art;

[0023] FIG. 3 is a perspective view of an electronic device according to some embodiments of the present application;

[0024] FIG. 4 is a front view of an electronic device according to some embodiments of the present application;

[0025] FIG. 5 is a cross-sectional view along A-A in FIG. 4;

[0026] FIG. 6 is a cross-sectional view along B-B in FIG. 4;

[0027] FIG. 7 is a perspective view of an electronic device according to some other embodiments of the present application;

[0028] FIG. 8 is a front view of an electronic device according to some other embodiments of the present application;

[0029] Fig. 9 is a schematic view of a cross-sectional structure along the direction of C-C in Fig. 8;

[0030] Fig. 10 is a schematic view of a cross-sectional structure along the direction of D-D in Fig. 8;

[0031] Fig. 11 is a schematic view of a perspective structure of an electronic device according to some embodiments of the present application;

[0032] Fig. 12 is a schematic view of a front structure of an electronic device according to some embodiments of the present application;

[0033] Fig. 13 is a schematic view of a cross-sectional structure along the direction of E-E in Fig. 12;

[0034] Fig. 14 is a schematic view of a cross-sectional structure along the direction of F-F in Fig. 12;

[0035] Fig. 15 is a schematic view of a perspective structure of an electronic device according to some embodiments of the present application;

[0036] Fig. 16 is a schematic view of a front structure of an electronic device according to some embodiments of the present application;

[0037] Fig. 17 is a schematic view of a cross-sectional structure along the direction of G-G in Fig. 16;

[0038] Fig. 18 is a schematic view of a cross-sectional structure along the direction of H-H in Fig. 16;

[0039] Fig. 19 is a schematic view of a perspective structure of an electronic device according to some embodiments of the present application;

[0040] Fig. 20 is a schematic view of a front structure of an electronic device according to some embodiments of the present application;

[0041] Fig. 21 is a schematic view of a cross-sectional structure along the direction of I-I in Fig. 20;

[0042] Fig. 22 is a schematic view of a cross-sectional structure along the direction of J-J in Fig. 20;

[0043] Fig. 23 is a schematic view of a perspective structure of an electronic device according to some embodiments of the present application;

[0044] Fig. 24 is a schematic view of a front structure of an electronic device according to some embodiments of the present application;

[0045] Fig. 25 is a schematic view of a cross-sectional structure along the direction of K-K in Fig. 24;

[0046] Fig. 26 is a schematic view of a cross-sectional structure along the direction of L-L in Fig. 24;

[0047] Fig. 27 is a schematic view of a perspective structure of an electronic device according to some embodiments of the present application;

[0048] Fig. 28 is a schematic view of a front structure of an electronic device according to some embodiments of the present application;

[0049] Fig. 29 is a schematic view of a cross-sectional structure along the direction of M-M in Fig. 28;

[0050] Fig. 30 is a schematic view of a cross-sectional structure along the direction of N-N in Fig. 28;

[0051] Fig. 31 is a schematic view of a perspective structure of an electronic device according to some embodiments of the present application;

[0052] Fig. 32 is a schematic view of a front structure of an electronic device according to some embodiments of the present application;

[0053] Fig. 33 is a schematic view of a cross-sectional structure along the direction of O-O in Fig. 32;

[0054] Fig. 34 is a schematic view of a cross-sectional structure along the direction of P-P in Fig. 32;

[0055] Fig. 35 is a schematic view of a perspective structure of an electronic device according to some embodiments of the present application;

[0056] Fig. 36 is a schematic view of a front structure of an electronic device according to some embodiments of the present application;

[0057] Fig. 37 is a schematic view of a cross-sectional structure along the direction of Q-Q in Fig. 36;

[0058] Fig. 38 is a schematic view of a cross-sectional structure along the direction of R-R in Fig. 36;

[0059] Fig. 39 is a schematic view of a perspective structure of an electronic device according to some embodiments of the present application;

[0060] Fig. 40 is a schematic view of a front structure of an electronic device according to some embodiments of the present application;

[0061] Fig. 41 is a schematic view of a cross-sectional structure along the direction of S-S in Fig. 40;

[0062] Fig. 42 is a schematic view of a cross-sectional structure along the direction of T-T in Fig. 40;

[0063] Fig. 43 is a comparison diagram of the numerical calculation sensitivity of an electronic device according to some embodiments of the present application and an electronic device in the prior art. DETAILED DESCRIPTION

[0064] In order to make the purposes, technical solutions, and advantages of the embodiments of the present application clearer, the various embodiments of the present application will be described in detail below with reference to the drawings. However, those skilled in the art can understand that, in the various embodiments of the present application, many technical details are presented in order to make the readers better understand the present application. However, the technical solutions claimed by the present application can be implemented even without these technical details and various changes and modifications based on the following embodiments. The division of the following various embodiments is for the convenience of description, and should not constitute any limitation on the specific implementation of the present application, and the various embodiments can be combined and referenced with each other without contradiction.

[0065] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the terms "include" and "have" and any variations thereof used in the specification and claims of this application and the above description of the drawings are intended to cover the non-exclusive inclusion.

[0066] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0067] With the continuous development of electronic technology, the audio effect of various electronic devices is getting better and better, enabling the listener to have an immersive experience. This not only depends on good audio recording quality, but also depends on good audio playback quality. Among various electronic devices for playing audio, in order to prevent the sound emitted in front and back of the speaker diaphragm from appearing as a short circuit, the speaker needs to be installed in a closed acoustic cavity structure, but too small acoustic cavity structure will cause the resonance frequency to rise, reducing the low frequency sensitivity of the electronic device, making the sound quality lack low frequency components. In order to ensure the playback effect of the low frequency components of the electronic device, a larger rear acoustic cavity is needed.

[0068] However, with the miniaturization and thinning of electronic devices such as sound boxes, the space left for the acoustic cavity structure is very limited. As shown in FIGS. 1 and 2, the cabinet 100 of the closed sound box only provides a limited acoustic cavity structure for the speaker 200, and the sound quality lacks low frequency components. In order to enhance the low frequency effect, the prior art mainly includes a phase inverter pipe, a passive radiator, a labyrinth cabinet structure, and an N'Bass material virtual expansion.

[0069] The phase inverter tube is installed on the cavity wall of the rear sound cavity. By changing the phase of the sound wave radiated from the back of the speaker diaphragm, the phase of the sound wave radiated from the front of the speaker diaphragm is close to in-phase in the main frequency band, which can effectively increase the low frequency component of the electronic device such as a sound box. However, the design and adjustment of the phase inverter tube need to be accurate, otherwise phase distortion may be introduced. If the phase inverter tube is designed or manufactured poorly, air flow noise problems are also likely to occur, and the overall Q value (also known as the quality factor) of the speaker is required to be no more than 0.6, while the overall Q value of a small speaker is difficult to be below 0.6.

[0070] The passive radiator is installed on the cavity wall of the rear sound cavity, which can be used to replace the phase inverter tube to enhance the bass of the electronic device such as a sound box, and at the same time can eliminate air flow noise. However, the passive radiator has high cost, low efficiency, and limited low frequency submersion, which is not a good choice.

[0071] The labyrinth box has a large volume, a complex structure, and is prone to air flow noise problems, and has high requirements for the sealing of the box.

[0072] The above three bass enhancement technologies all use the sound wave from the back of the speaker diaphragm, and are prone to sound trailing phenomenon. Although filling N'Bass material in the rear sound cavity can virtually expand the volume of the rear sound cavity of the sound box, thereby enhancing the bass of the sound box, and can overcome the sound trailing problem, but the low frequency enhancement effect of the large rear sound cavity sound box is limited, and the N'Bass material is very expensive, which is currently mainly used to improve the acoustic performance of small and medium high-end consumer electronic products such as mobile phones, tablet computers and notebook computers, limiting the more extensive application of such materials.

[0073] Therefore, it is necessary to develop a bass enhancement technology that can overcome the shortcomings of the above existing bass enhancement technologies to improve the bass effect of electronic devices.

[0074] Therefore, some embodiments of the present application provide an acoustic cavity structure which can be used to enhance the bass of the low frequency unit in electronic devices such as home sound boxes, car sound boxes, conference system sound boxes, stage sound boxes and professional recording studio sound boxes. The speaker is installed in the cavity, and part of the structure of the front sound cavity of the cavity is composed of a sound propagation channel. One end of the sound propagation channel is adjacent to the sound emitting part of the speaker diaphragm, and the other end is in communication with the outside atmosphere through a sound outlet. By utilizing the coupling resonance of the sound mode of the front sound cavity with the sound propagation channel and the structure mode of the speaker, the low frequency component of the electronic device can be enhanced. By designing a bass enhancement structure in the front sound cavity, the front sound cavity in the prior art which is usually used to improve the acoustic performance of the middle and high frequencies is creatively used to improve the acoustic performance of the low frequencies, so that the electronic device only presents the bass effect.

[0075] In addition, the cavity can be manufactured by a mold or 3D printing, which is convenient to manufacture and can save the cost of the sound box. Thus, the deficiencies of the prior art low-frequency enhancement technology are overcome, and the electronic device achieves the purpose of low-frequency enhancement.

[0076] The sound cavity structure in the electronic device provided by some embodiments of the present application will be described below with reference to FIGS. 3-42.

[0077] As shown in FIGS. 3-6, the sound cavity structure provided by some embodiments of the present application includes a cavity 11. The cavity 11 can include a first cavity 111 and a second cavity 112 connected together, and the connection between the first cavity 111 and the second cavity 112 is in a communicating manner. A front sound cavity 101 is located in the first cavity 111, and a rear sound cavity 102 is located in the second cavity 112. The first cavity 111 is provided with a sound outlet hole 103.

[0078] That is, the cavity 11 is formed by connecting two separate first cavity 111 and second cavity 112. In addition, there is a communicating part at the connection between the first cavity 111 and the second cavity 112, so that the front sound cavity 101 in the first cavity 111 is in communication with the rear sound cavity 102 in the second cavity 112. The sound outlet hole 103 is arranged on the first cavity 111. The connection between the first cavity 111 and the second cavity 112 can be achieved by fasteners, buckles or magnetic attraction and the like.

[0079] The cavity 11 has the front sound cavity 101 and the rear sound cavity 102 in communication with each other. The connection between the front sound cavity 101 and the rear sound cavity 102 is used to arrange a loudspeaker 20, and the loudspeaker 20 faces the front sound cavity 101. The cavity wall of the front sound cavity 101 is formed with a sound outlet hole 103 in communication with the outside. The front sound cavity 101 is provided with a sound propagation channel 12 in communication with the sound outlet hole 103, and the sound propagation channel 12 is used to propagate the sound in the front sound cavity 101 when the loudspeaker 20 plays to the outside. The sound propagation channel 12 includes a plurality of sub-channels 121 arranged in a direction away from the center of the front sound cavity 101. The lengths of the plurality of sub-channels 121 gradually increase. Adjacent sub-channels 121 in the plurality of sub-channels 121 are in communication with each other. The sub-channel 121 farthest from the center of the front sound cavity 101 in the plurality of sub-channels 121 is in communication with the sound outlet hole 103.

[0080] After the loudspeaker 20 is installed, the front sound cavity 101 and the rear sound cavity 102 of the cavity 11 are not in communication with each other. By dividing the sound radiated by the loudspeaker 20 before and after the diaphragm, the sound short circuit is prevented, and the sound effect of the loudspeaker 20 is improved. The front sound cavity 101 and the rear sound cavity 102 of the cavity 11 can provide a relatively closed resonance space for the propagation of sound. By changing the size and internal structure of the inner cavity, the resonance characteristics of the cavity 11 can be adjusted, and thus the sound quality of the electronic device can be changed.

[0081] The front sound cavity 101 comprises a first area 1011 and a second area 1012 surrounding the first area 1011, the sound propagation channel 12 comprises a plurality of sub-channels 121 arranged in sequence around the first area 1011 and in a direction pointing from the first area 1011 to the second area 1012, the lengths of the plurality of sub-channels 121 gradually increase in a direction away from the center of the front sound cavity 101, and any two adjacent sub-channels 121 are in communication with each other. One end of the sound propagation channel 12 is adjacent to the diaphragm of the loudspeaker 20, and the other end of the sound propagation channel 12 is in communication with the outside world through the sound hole 103.

[0082] The sound propagation channel 12 is formed by the sub-channels 121 with gradient-changing lengths in communication with each other. In each sub-channel 121, the sub-channels 121 at the inner and outer edges are in communication with the sound generating area of the loudspeaker 20 and the outside world, respectively, thereby forming a curved channel for gradually propagating sound from the loudspeaker 20 in the forward direction to the outside of the cavity 11. Such sub-channels 121 can be arranged around the periphery of the first area 1011. The sub-channels 121 can be linear, polygonal, circular, or arc-shaped, and in any three adjacent sub-channels 121, the sub-channel 121 at the middle position is in communication with the two adjacent sub-channels 121 at positions away from each other. The sub-channels 121 can also be spiral-shaped.

[0083] It should be noted that for electronic devices such as closed sound boxes, the low-frequency effect can be improved by increasing the volume of the rear sound cavity 102 in the sound cavity structure, but when the volume of the rear cavity reaches a certain size, the improvement effect of the low-frequency performance of the sound box and other electronic devices by continuously increasing the volume of the rear cavity is very limited. Therefore, the sound cavity structure provided in some embodiments of the present application is provided with a sound propagation channel 12 in the front sound cavity 101 of the cavity 11. By designing a reasonable sound propagation channel 12, such as the length of the curved channel, the cross-sectional size of the sub-channel 121, the number of sound propagation channels 12, etc., the first-order acoustic modal frequency of the open cavity composed of the sound propagation channel 12 and the first area 1011 of the front sound cavity 101 can be lower than the resonance frequency F0 of the loudspeaker 20 alone, i.e., the first-order structural modal frequency. The two modalities are coupled, so that the sound box and other electronic devices produce stronger low-frequency sound.

[0084] As shown in FIGS. 5 and 6, the sound propagation channel 12 can be uniformly distributed around the center of the front sound cavity 101, each sound propagation channel 12 is provided with two edge portions 122, and a plurality of isolation portions 123 are arranged in a direction away from the center of the front sound cavity 101 between the two edge portions 122, the space between adjacent two isolation portions 123 forms a sub-channel 121, and the plurality of sub-channels 121 are in sequence and in communication with each other.

[0085] The number of sound propagation channels 12 distributed on the same plane can be two, three, four or more. Different sound propagation channels 12 correspond to different sound outlets 103, and the sub-channels 121 between two adjacent sound propagation channels 12 are in an isolated state.

[0086] The sub-channels 121 are formed between two adjacent isolation portions 123 of the sound propagation channel 12, and the lengths of the plurality of isolation portions 123 of the sound propagation channel 12 increase in the direction away from the center of the front sound cavity 101, thereby forming a plurality of sub-channels 121 with lengths increasing in the direction away from the center of the front sound cavity 101. The plurality of isolation portions 123 are alternately connected to the two edge portions 122, that is, in any three adjacent isolation portions 123, the two edge portions 122 at the two side positions are connected to the same edge portion 122. Each isolation portion 123 has a spacing with the unconnected edge portion 122, so that the plurality of sub-channels 121 are connected to each other to form a curved channel.

[0087] In addition, the connection between two adjacent sound propagation channels 12 can share the same edge portion 122, which can reduce the space occupied by the edge portion 122 of the sound propagation channel 12, and is beneficial to increase the effective length of the sub-channel 121, so as to improve the bass enhancement effect of the sound propagation channel 12.

[0088] The innermost sub-channel 121 is connected to the front sound emitting area of the loudspeaker 20, and the outermost sub-channel 121 is connected to the outside through the sound outlet 103, thereby forming a complete path for sound to propagate in the direction away from the center of the front sound cavity 101 through different sub-channels 121 in sequence. Through the complete path, the sound emitted by the loudspeaker 20 in the front direction can be propagated through different sound propagation channels 12 and radiated to the outside through different sound outlets 103, so that the low-frequency components of the sound in different directions are enhanced through the sound propagation channels 12 at different positions.

[0089] In some embodiments, as shown in FIGS. 7-14, the cavity 11 can be prismatic, each isolation portion 123 can be flat, each isolation portion 123 can be parallel to the side wall of the cavity 11, or each isolation portion 123 can include a first portion 1231 and a second portion 1232 connected to each other, and the first portion 1231 and the second portion 1232 of each isolation portion 123 are parallel to different side walls of the cavity 11.

[0090] When the cavity 11 is prismatic, it includes parallel top and bottom walls and a plurality of side walls connecting the top and bottom walls. The inner cavity of the cavity 11 is prismatic. At this time, each sub-channel 121 of the sound propagation channel 12 can be adjusted to be linear. That is, the isolation portion 123 can be provided in a flat plate shape, and the isolation portions 123 in the area where the same sound propagation channel 12 is located are parallel to the same side wall of the cavity 11, that is, a plurality of sound propagation channels 12 are provided corresponding to a plurality of side walls of the cavity 11. The sound outlet hole 103 can be provided at the edge position of the side of the cavity 11.

[0091] Alternatively, as shown in FIGS. 11-14, the sub-channels 121 of the sound propagation channel 12 can also be adjusted to be broken lines. The first portion 1231 and the second portion 1232 of the isolation portion 123 have an included angle, which is consistent with the included angle between the two adjacent side walls of the cavity 11. By the broken line-shaped isolation portion 123, the broken line-shaped sub-channel 121 can be constructed in the second area 1012, and a curved channel for sound propagation can also be formed.

[0092] It should be noted that the first portion 1231 and the second portion 1232 of each isolation portion 123 are divisions of the isolation portion 123 at different positions. The two portions of each isolation portion 123 can be integrally formed, or separately formed and connected together.

[0093] In some embodiments, as shown in FIGS. 15-18, the sound propagation channel 12 includes a multi-layer structure arranged in layers along the axial direction of the loudspeaker 20, and each layer structure includes a plurality of sub-channels 121. In the axial direction of the loudspeaker 20, the sub-channel 121 at the sound propagation end in each layer structure is connected to the sub-channel 121 at the sound propagation start in the next layer structure.

[0094] That is, the sub-paths 121 can be arranged in layers in the axial direction of the speaker 20 while being arranged around the first region 1011. The sub-paths 121 in different layers communicate with each other at the end of the sound propagation path, and only one layer of the sub-paths 121 communicates with the outside and only one layer of the sub-paths 121 communicates with the first region 111 in the axial direction of the speaker 20. If the layer of the sub-paths 121 away from the speaker 20 in the axial direction of the speaker 20 communicates with the forward sound emitting region of the speaker 20 at the center close to the first region 1011, then the layer of the sub-paths 121 close to the speaker 20 in the axial direction of the speaker 20 communicates with the outside through the sound outlet 103 at the center away from the first region 1011. Conversely, if the layer of the sub-paths 121 close to the speaker 20 in the axial direction of the speaker 20 communicates with the forward sound emitting region of the speaker 20 at the center close to the first region 1011, then the layer of the sub-paths 121 away from the speaker 20 in the axial direction of the speaker 20 communicates with the outside through the sound outlet 103 at the center away from the first region 1011. In practice, sub-paths 121 of different lengths can be arranged in one, three, five or more odd layers in the axial direction of the speaker 20.

[0095] By changing the number of layers of the sub-paths 121 in the axial direction of the speaker 20, a longer sound propagation path 12 can be obtained, which can make the front sound cavity structure have a lower resonance frequency, and thus make the electronic device have a lower low-frequency diving.

[0096] As shown in FIGS. 19 to 22, the projection of the sound propagation path 12 in the axial direction of the speaker 20 can be spiral.

[0097] When the projection of the sound propagation path 12 is spiral, a curved path for sound propagation can also be formed, which enhances the low-frequency part of the propagated sound. In practice, the center line of the sound propagation path 12 can be arranged in the shape of an Archimedes spiral.

[0098] In addition, a plurality of sound propagation paths 12 can be arranged in the axial direction of the speaker 20, and each sound propagation path 12 corresponds to a sound outlet 103.

[0099] As shown in FIGS. 23 to 26, the region where the sound propagation path 12 is located can be provided with a plurality of partitions 124 around the same center, and the space between adjacent two partitions 124 forms a sub-path 121. Each partition 124 is provided with a gap 125, and adjacent two sub-paths 121 communicate through the gap 125.

[0100] The plurality of partitions 124 are arranged in multiple circles around the same center outside the first area 1011, and adjacent two sub-channels 121 are connected through the gaps 125 on the partitions 124. By moving the gaps 125 of adjacent two partitions 124 away from each other, a sound propagation channel 12 is formed, which has a length gradient in the direction from the first area 1011 to the second area 1012 and is connected to each other.

[0101] In addition, in some embodiments, the sound propagation channel 12 can also be arranged in multiple numbers along the axial direction of the loudspeaker 20.

[0102] Each sound propagation channel 12 is connected to the outside through an acoustic outlet 103. By changing the number of sound propagation channels 12 in the axial direction of the loudspeaker 20, multiple acoustic outlets 103 can be arranged in the axial direction of the surround loudspeaker 20. In order to adjust the orientation of each acoustic outlet 103, each acoustic outlet 103 radiates sound in different directions.

[0103] As shown in FIGS. 27-30, in some embodiments, the sound propagation channel 12 can include a first sound propagation channel and a second sound propagation channel arranged outside the first sound propagation channel. The first sound propagation channel and the second sound propagation channel each include a plurality of sub-channels 121 arranged in a direction away from the center of the front sound cavity 101, and a gap is arranged between the first sound propagation channel and the second sound propagation channel.

[0104] By arranging multiple sound propagation channels 12 in the same direction, the sound modal density of the front sound cavity 101 can be increased, thereby improving the bass enhancement effect.

[0105] In some embodiments, as shown in FIGS. 31-34, the cavity 11 can be provided with a central hole 104, one end of which is connected to the first area 1011, and the other end of which is connected to the outside.

[0106] The central hole 104 is connected to the first area 1011 of the front sound cavity 101 and is located in the sound propagation path of the forward direction of the loudspeaker 20. The sound propagation path formed by the central hole 104 can adjust the resonance effect of the front sound cavity 101 and improve the bass enhancement effect of the front sound cavity 101. The central hole 104 can be of any shape, such as a cylindrical shape, a prismatic shape, or other irregular shapes. As shown in FIGS. 35-38, the central hole 104 can extend into the front sound cavity 101 to increase the length and further improve the bass enhancement effect of the front sound cavity 101.

[0107] It should be noted that in the above embodiments, the acoustic outlet 103 can be arranged on any surface of the first cavity 111. As shown in FIGS. 39-42, the acoustic outlet 103 can be arranged on the cavity wall surface perpendicular to the axial direction of the loudspeaker 20.

[0108] The position of the sound outlet hole 103 can be attached with a mesh cloth, which can reduce the risk of airflow noise and also serve as physical protection and dust protection.

[0109] Some embodiments of the present application also provide an electronic device comprising the sound cavity structure described above.

[0110] When designing the sound cavity structure of an electronic device, the following steps can be followed:

[0111] Step S10, determine the first-order structural modal frequency of the loudspeaker through experiment or simulation.

[0112] Step S20, calculate the acoustic mode of the front sound cavity containing the sound propagation channel by finite element method. When calculating the acoustic mode, the sound outlet hole adopts the pipe end impedance boundary condition. By adjusting the length of the curved channel of the sound propagation channel, the cross-sectional size of the channel, the number of sound propagation channels, etc., the first-order acoustic modal frequency of the front sound cavity is lower than the first-order structural modal frequency of the loudspeaker.

[0113] Wherein, the longer the length of the curved channel, the lower the first-order acoustic modal frequency of the front sound cavity. The larger the cross-sectional size of the channel, the higher the first-order acoustic modal frequency of the front sound cavity. The more the number of sound propagation channels, the higher the first-order acoustic modal frequency of the front sound cavity.

[0114] Step S30, calculate the sensitivity of the electronic device containing the sound cavity structure provided by the present application (containing the front sound cavity and the rear sound cavity) and the electronic device containing the sealed sound cavity structure without the front sound cavity by finite element method, to determine the low-frequency enhancement effect of the sound cavity structure provided by the present application on the electronic device. If the low-frequency enhancement effect is not good, repeat step S20 until a satisfactory low-frequency enhancement effect is obtained.

[0115] Step S40, use experiments to verify the low-frequency enhancement effect of the sound cavity structure on the electronic device. If the low-frequency enhancement effect is not good, repeat steps S20 and S30 until a satisfactory low-frequency enhancement effect is obtained.

[0116] The electronic device can replace existing low-frequency enhancement technologies such as inverse phase tubes and passive radiators by using the sound cavity structure provided by the present application for low-frequency enhancement. The sound cavity structure provided by the present application has broad development prospects in enhancing the low-frequency unit of electronic devices such as home sound boxes, car sound boxes, conference system sound boxes, stage sound boxes, and professional recording studio sound boxes.

[0117] Fig. 43 takes a sound box as an example, and numerically calculates the sensitivity of the sound box (also referred to as an acoustic metamaterial sound box, shown in Fig. 3) provided by some embodiments of the present application and a sealed sound box (shown in Fig. 1) without a front sound box. The volume of the rear sound cavity is 180 cc (cubic centimeter), and the resonance frequency is 205 Hz. It can be seen that, compared with the sealed sound box, the sensitivity of the sound box provided by some embodiments of the present application is improved by a maximum of 6.4 dB / W / m (decibel / watt / meter) in the range below the resonance frequency of the sealed sound box.

[0118] Therefore, the sound cavity structure provided by some embodiments of the present application can bring better bass enhancement effect to the bass unit of the electronic device.

[0119] Compared with the prior art, the bass enhancement technology of the sound cavity structure provided by the present application can obtain better low frequency diving, and can eliminate the sound tailing phenomenon. Compared with the inverse phase tube, the design is simple, and the Q value requirement of the loudspeaker is low. The total Q value of the loudspeaker used in the numerical calculation in Fig. 43 is 0.982, which is greater than the maximum value required by the inverse phase tube, but the sound cavity structure provided by the present application can still enhance the bass effect. Compared with the passive radiator and the N'Bass material virtual expansion technology, the cost can be greatly reduced. Compared with the labyrinth box, the volume can be greatly reduced.

[0120] Those skilled in the art can understand that the above-mentioned embodiments are specific embodiments for implementing the present application, and in actual application, various changes can be made in form and details without departing from the spirit and scope of the present application.

Claims

1. An acoustic cavity structure, comprising: The cavity; The cavity has a front sound cavity and a rear sound cavity in communication with each other, and a speaker is arranged at the communication position of the front sound cavity and the rear sound cavity, and the speaker faces the front sound cavity; An acoustic outlet hole is formed on the cavity wall of the front sound cavity and communicates with the outside, and a sound propagation channel is arranged in the front sound cavity and communicates with the acoustic outlet hole, and the sound propagation channel is used to propagate the sound emitted by the speaker to the outside; The sound propagation channel includes a plurality of sub-channels arranged away from the center of the front sound cavity, and the lengths of the plurality of sub-channels gradually increase; adjacent sub-channels in the plurality of sub-channels are in communication with each other, and the sub-channel farthest from the center of the front sound cavity in the plurality of sub-channels communicates with the acoustic outlet hole.

2. The acoustic cavity structure of claim 1, wherein: The sound propagation channel is distributed around the center of the front sound cavity, each sound propagation channel is provided with two edge portions, and a plurality of isolation portions are arranged in sequence between the two edge portions and away from the center of the front sound cavity, the space between adjacent two isolation portions forms the sub-channel, and the plurality of sub-channels are sequentially connected in a head-to-tail manner.

3. The acoustic cavity structure of claim 2, wherein: The cavity is provided in a prismatic shape, each isolation portion is provided in a flat plate shape, and each isolation portion is arranged in parallel with the side wall of the cavity, or each isolation portion includes a first portion and a second portion connected with each other, and the first portion and the second portion of each isolation portion are arranged in parallel with different side walls of the cavity.

4. The sound cavity structure of claim 2 or 3, wherein: The sound propagation channel includes a multi-layer structure arranged in layers along the axial direction of the speaker, and each layer structure includes a plurality of sub-channels; in the axial direction of the speaker, the sub-channel at the sound propagation end point in each layer structure penetrates the sub-channel at the sound propagation start point in the next layer structure.

5. The acoustic cavity structure of claim 1, wherein: The projection of the sound propagation channel along the axial direction of the speaker is in a spiral shape.

6. The acoustic cavity structure of claim 1, wherein: The front sound cavity is provided with a plurality of isolation members around the same center, the space between adjacent two isolation members forms the sub-channel, each isolation member is provided with a notch, and adjacent two sub-channels are communicated through the notch.

7. The sound cavity structure of claim 5 or 6, wherein: The sound propagation channel is provided with a plurality of sub-channels along the axial direction of the speaker.

8. The acoustic cavity structure of claim 1, wherein: The sound propagation channel includes a first sound propagation channel and a second sound propagation channel located at the periphery of the first sound propagation channel, and the first sound propagation channel and the second sound propagation channel each include a plurality of sub-channels arranged away from the center of the front sound cavity, and a space is arranged between the first sound propagation channel and the second sound propagation channel.

9. The acoustic cavity structure of claim 1, wherein: The cavity is provided with a central hole facing the speaker, one end of the central hole communicates with the front sound cavity, and the other end of the central hole communicates with the outside.

10. An electronic device comprising the sound cavity structure of any one of claims 1 to 9.

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