Picture frame speaker including a multi-layer vibrating plate

Abstract

The application discloses a picture frame sound box comprising a multilayer vibration plate, which comprises a picture frame; a vibration plate and a sub-vibration plate, which are installed in the picture frame and enclosed to form an acoustic cavity; and a drive horn arranged on the vibration plate and configured to drive the vibration plate to vibrate and sound by mechanical vibration, and the drive horn does not directly sound itself. The application realizes a picture frame sound box structure, which sounds by flat plate vibration, and the vibration plate and the sub-vibration plate are used to form an acoustic cavity, so that the sound quality and sound effect can be improved, and thinning can be realized.

Description

Technical Field

[0001] This application relates to the field of acoustic technology, specifically to a picture frame speaker that includes multiple layers of diaphragms. Background Technology

[0002] In existing technologies, picture frame speakers are designed to combine decorative and acoustic functions to meet users' needs for space utilization and aesthetics. However, such products face significant challenges in achieving both a slim profile and a balanced sound quality.

[0003] There is an urgent need for a frame speaker with a simplified structure, thinner profile, and more efficient vibration transmission to solve the problem of balancing sound quality and thinness in existing technologies. Utility Model Content

[0004] The main technical problem this application addresses is to provide a picture frame speaker that includes multiple layers of diaphragms.

[0005] This application provides a picture frame speaker including a multi-layered diaphragm, comprising: a picture frame; a diaphragm and a secondary diaphragm installed in the picture frame and forming a sound cavity with the diaphragm; and a driver speaker disposed on the diaphragm and configured to drive the diaphragm to vibrate and produce sound through mechanical vibration, wherein the driver speaker itself does not directly produce sound.

[0006] In some alternative embodiments, the driving horn includes: a frame, a magnetic assembly oscillably connected to the frame via a spring, and a vibrating assembly oscillably connected to the frame via a spring; the vibrating assembly includes a voice coil connected to the spring and an adhesive ring disposed on the voice coil, the adhesive ring being fixedly connected to the diaphragm, and the frame and the diaphragm not being directly connected; the magnetic assembly and the vibrating assembly vibrate together to form a dual driving force.

[0007] In some alternative embodiments, the drive horn has multiple horns, which are disposed on the same side surface of the vibrating plate, or are disposed separately on the two sides of the vibrating plate.

[0008] In some alternative embodiments, it further includes: a tweeter disposed on the diaphragm; the tweeter having a diaphragm configured to emit a high-frequency sound (i.e., a high-frequency sound) relative to the diaphragm.

[0009] In some alternative embodiments, the tweeters are multiple and disposed on the same side surface of the diaphragm.

[0010] In some alternative embodiments, the plurality of sub-vibrating plates and the vibrating plate surround each other to form a plurality of acoustic cavities, and the volume of the plurality of acoustic cavities decreases sequentially in the direction away from the vibrating plate.

[0011] As can be seen from the above technical solutions, the main technical effects achieved by this application include:

[0012] (1) A frame-shaped speaker structure including multiple vibrating plates has been realized, which can achieve ultra-thinness, reduce space occupation, and is easy to arrange in various spaces;

[0013] (2) Using a driver speaker to drive the vibrating plate to produce sound by flat plate vibration can effectively increase the bass effect; at the same time, a tweeter can be further set up. The two work together to achieve good sound quality and sound effect across the entire frequency range.

[0014] (3) The sound cavity is formed by the vibrating plate and the auxiliary vibrating plate, which can effectively improve the sound quality and sound effect of the picture frame speaker;

[0015] (4) This picture frame speaker can replace traditional speakers, reduce size and space occupation; it can be hung on the wall as a decoration; it can be embedded in paintings or photos; it can be used as a Bluetooth speaker; it can be used for home karaoke; etc. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments and the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figures 1 to 4 This application provides a front view, a side view, and a three-dimensional view of a picture frame speaker according to Embodiment 1.

[0018] Figures 5 to 8 This is a schematic diagram of the longitudinal cross-sectional structure of the driving horn provided in several different embodiments of this application;

[0019] Figures 9 to 11 This is a front view structural diagram and a three-dimensional structural diagram from different angles of a picture frame speaker provided in Embodiment 2 of this application;

[0020] Figures 12 to 14 This application provides a front view structural diagram of a picture frame speaker and two three-dimensional structural diagrams from different angles, as shown in Embodiment 3 of this application.

[0021] Figures 15 to 17 This is a front view structural diagram and a three-dimensional structural diagram from different angles of a picture frame speaker provided in Embodiment 4 of this application;

[0022] Figures 18 to 22This application provides a front view structural diagram, a side cross-sectional structural diagram, and a three-dimensional structural diagram of a picture frame speaker from different angles and in different implementations, as shown in Embodiment 5 of this application.

[0023] Figures 23 to 25 This is a front view structural diagram and a three-dimensional structural diagram from different angles of a picture frame speaker provided in Embodiment Six of this application;

[0024] Figures 26 to 27 This is a front view and a three-dimensional view of a picture frame speaker provided in Embodiment 7 of this application;

[0025] Figure 28 This is a partial side cross-sectional view of a picture frame speaker provided in Embodiment 8 of this application;

[0026] Figures 29 to 30 This is a front view and a three-dimensional view of a picture frame speaker provided in Embodiment 9 of this application;

[0027] Figures 31 to 32 This is a front view and a three-dimensional view of a picture frame speaker provided in Embodiment 10 of this application;

[0028] Figures 33 to 35 These are front view, side sectional view, and rear view structural schematic diagrams of a picture frame speaker provided in Embodiment Eleven of this application. Detailed Implementation

[0029] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present application.

[0030] The terms "first," "second," "third," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0031] The following detailed descriptions will be provided through specific embodiments.

[0032] Example 1

[0033] refer to Figures 1 to 4 Embodiment 1 of this application provides a picture frame speaker. The picture frame speaker includes:

[0034] Picture frame 10;

[0035] Vibration plate 20 is installed in picture frame 10;

[0036] The driver horn 30 is mounted on the vibrating plate 20 and is configured to drive the vibrating plate 20 to vibrate and produce sound through mechanical vibration, but the driver horn 30 itself does not produce sound directly.

[0037] Here, the picture frame 10 can be square, for example, composed of four borders, with mounting grooves 11 formed on the inner side of the borders for mounting the vibrating plate 20. The borders of the picture frame 10 can be connected to each other, for example, by screws 12, or by other means. The materials of the picture frame 10 include, but are not limited to, metal, plastic, wood, and ceramic.

[0038] Here, the diaphragm 20 is a component used to generate sound through vibration. The diaphragm 20 can adopt a honeycomb structure to increase the vibration effect and improve sound quality. The material of the diaphragm 20 includes, but is not limited to, cardboard, aluminum plate, copper plate, plastic plate, etc. In this embodiment, the driver speaker 30 drives the diaphragm 20 to vibrate and generate sound through mechanical vibration. Compared with the direct sound generation by the speaker, this method of generating sound through flat plate vibration can effectively increase the bass (i.e., low-frequency sound) effect.

[0039] In addition to the vibrating plate 20, other plates can be optionally installed in the mounting slot 11 of the picture frame 10. For example, a decorative painting board can be installed on the front, or a plate made of transparent glass or acrylic can be installed to hold photos or paintings inside. This article does not limit this.

[0040] refer to Figure 5 The image shows a drive horn 30 according to an embodiment of this application. The drive horn 30 includes a frame 38, a magnetic assembly oscillatingly connected to the frame 38 via a spring 31, and a vibrating assembly oscillatingly connected to the frame 38 via a spring 32; the magnetic assembly and the vibrating assembly vibrate together to form a dual driving force.

[0041] Among them, the spring 32 is exposed in the basin frame 38.

[0042] The vibration assembly may include a voice coil 33 connected to the spider 32 and an adhesive ring 34 disposed on the voice coil 33. The adhesive ring 34 is used to fix it to the diaphragm 20. The frame 38 and the diaphragm 20 are not directly connected.

[0043] The magnetic assembly may include a U-shaped iron 35 connected to the spring 31, a magnet 36 disposed within the U-shaped iron 35, and a washer 37 disposed above the magnet 26.

[0044] Among them, the magnet 26 and the washer 37 have similar diameters, and a gap is formed between their sides and the inner wall of the U-shaped iron 35 to accommodate the voice coil 33, which can vibrate up and down within the gap.

[0045] In some alternative implementations, from a top-down view, the drive horn 30 may be generally in the shape of a flat disc.

[0046] In some alternative implementations, the outer edge of the spider 32 is connected to the upper surface of the frame 38, and the inner edge of the spider 32 is connected to the voice coil 33.

[0047] In some alternative embodiments, the wave 32 is wave-shaped and includes multiple corrugated sections.

[0048] In some alternative embodiments, the basin frame 38 has a through hole in the center, the magnetic assembly is located in the through hole, and the spring piece 31 is connected between the basin frame 38 and the magnetic assembly.

[0049] In some alternative embodiments, the spring 31 includes an annular portion and a plurality of connecting portions that connect the annular portion to the basin frame 38.

[0050] In some alternative embodiments, the U-shaped iron 35 of the magnetic assembly may be disposed on the annular portion, and the magnet 36 and the washer 37 may be disposed sequentially inside the U-shaped iron 35, wherein the upper surface of the U-shaped iron 35 and the upper surface of the washer 37 may be substantially flush.

[0051] Here, the driver speaker 30 can achieve an ultra-thin structure, for example, it can be within 10mm.

[0052] Here, the working principle of the speaker 30 includes: an audio signal is applied to the voice coil 33, which generates an alternating magnetic field; the magnetic field generated by the voice coil 33 interacts with the fixed magnetic field of the permanent magnet (i.e., magnet 26), causing the voice coil 33 and the adhesive ring 34 set on it to vibrate, while the magnetic component itself also vibrates; the adhesive ring 34 drives the diaphragm 20 to vibrate, and the diaphragm 20 restores the audio signal to sound through its own vibration.

[0053] refer to Figure 6 This illustrates a driver horn 30 according to another embodiment of this application. Figure 6 and Figure 5 Similar, but different in:

[0054] Figure 6In the driver horn 30 shown, the height of the frame 38 is reduced, and the height of the frame 38 is less than the height of the U-shaped iron 35, thereby further reducing the thickness of the driver horn 30. Figure 5 In the drive horn 30 shown, the height of the frame 38 is equal to or slightly higher than the height of the U-shaped iron 35, which can increase the vibration amplitude and improve the driving force.

[0055] refer to Figure 7 This illustrates a driver horn 30 according to yet another embodiment of this application. Figure 7 and Figure 5 Similar, but different in:

[0056] Figure 7 In the driver speaker 30 shown, the spring 31 is removed, and the magnetic assembly is directly connected to the frame 38. Specifically, the U-shaped iron 35 is directly connected to the frame 38. In this case, the magnetic assembly and the frame 38 are integrated, and only the vibrating assembly can vibrate relative to the frame 38.

[0057] refer to Figure 8 The image shows a driver horn 30 according to another embodiment of this application. Figure 8 and Figure 7 Similar, but different in:

[0058] Figure 8 In the driver horn 30 shown, the height of the frame 38 is reduced, and the height of the frame 38 is less than the height of the U-shaped iron 35, thereby further reducing the thickness of the driver horn 30. Figure 7 In the driver horn 30 shown, the height of the frame 38 is equal to or slightly higher than the height of the U-shaped iron 35.

[0059] In summary, Embodiment 1 of this application proposes a picture frame speaker.

[0060] This picture frame speaker utilizes a driver 30 to drive a vibrating plate 20, causing the vibrating plate 20 to produce sound through flat plate vibration. This method enhances the bass (low-frequency sound) effect. Here, the magnetic component and the vibrating component in the driver 30 vibrate together, forming a dual driving force, equivalent to two drives working simultaneously. This significantly increases the driving force, by approximately 50% or more compared to a conventional moving-coil speaker. This allows for increased volume and improved sound quality while achieving a slim profile. Furthermore, the driver 30 exhibits high sensitivity, far exceeding that of ordinary loudspeakers, enabling the playback of mid-to-high frequency audio. Therefore, this picture frame speaker can play a wide range of sounds across the entire frequency spectrum, including various types of music, achieving extremely high sound quality.

[0061] As mentioned above, the picture frame speaker of this application can achieve extremely high sound quality and effects while being lightweight and thin; this picture frame speaker can replace traditional speakers, reduce size, and reduce space occupation; it can be hung on the wall as a decoration; it can embed paintings or photos; it can be equipped with a Bluetooth module to be used as a Bluetooth speaker; it can be used for home karaoke; and so on.

[0062]

Example 2

[0063] refer to Figures 9 to 11 Embodiment 2 of this application provides a picture frame speaker.

[0064] The picture frame speaker in Embodiment 2 of this application is similar to the picture frame speaker in Embodiment 1 of this application, except that:

[0065] In the picture frame speaker of Embodiment 2 of this application, there may be multiple driver speakers 30, which are disposed on the same side surface of the diaphragm 20. For example, two driver speakers 30 may be disposed on the same side surface of the diaphragm 20.

[0066]

Example 3

[0067] refer to Figures 12 to 14 Embodiment 3 of this application provides a picture frame speaker.

[0068] The picture frame speaker in Embodiment 3 of this application is similar to the picture frame speaker in Embodiment 1 of this application, except that:

[0069] In the picture frame speaker of Embodiment 3 of this application, there may be multiple driver speakers 30, which are separately disposed on both sides of the vibrating plate 20. For example, two driver speakers 30 may be disposed on one side of the vibrating plate 20, and one driver speaker 30 may be disposed on the other side.

[0070]

Example 4

[0071] refer to Figures 15 to 17 Embodiment 4 of this application provides a picture frame speaker.

[0072] The picture frame speaker in Embodiment 4 of this application is similar to the picture frame speaker in Embodiment 1 of this application, except that:

[0073] The picture frame speaker in Embodiment 4 of this application further includes a tweeter 40, disposed on the diaphragm 20. The number of tweeters 40 can be one or more, and they can be disposed on the same side surface of the diaphragm 20. For example, in the figure, two tweeters 40 are disposed on the diaphragm 20, both disposed on the outer surface of the diaphragm 20. Here, unlike the driver horn 30, which itself does not have a diaphragm and does not directly emit sound, the tweeter 40 is a complete speaker unit with a diaphragm, which can be configured to emit relatively high-frequency treble relative to the diaphragm 20.

[0074] Optionally, the tweeter 40 can be installed in the opening of the diaphragm 20, and the front and back of the tweeter 40 can be seen from the surface distribution on two opposite sides of the diaphragm 20.

[0075] Example 5

[0076] refer to Figures 18 to 22 Embodiment 5 of this application provides a picture frame speaker.

[0077] The picture frame speaker of Embodiment 4 of this application is similar to the picture frame speakers of Embodiments 3 and 4 of this application, and is equivalent to a combination of the picture frame speakers of Embodiments 3 and 4. Specifically, two driver speakers 30 and two tweeters 40 are provided on one side surface (outer surface) of the vibrating plate 20, and one driver speaker 30 is provided on the other side surface (inner surface). Figure 21 (as shown) or two drive horns 30 (such as) Figure 22 (As shown).

[0078] Example 6

[0079] refer to Figures 23 to 25 Embodiment 6 of this application provides a picture frame speaker.

[0080] The picture frame speaker of Embodiment Six of this application is similar to the picture frame speaker of Embodiment One of this application, except that:

[0081] The picture frame speaker in Embodiment Six of this application further includes: a secondary vibrating plate 50, which is installed in the picture frame 10 and forms a sound cavity with the vibrating plate 20. The secondary vibrating plate 50 can be arranged parallel to the vibrating plate 20, with their supports spaced a certain distance apart, and the cavity between them constitutes the sound cavity.

[0082] For example, a drive horn 30, such as two, may be provided on the surface of the diaphragm 20 away from the sub-diaphragm 50; a tweeter 40, such as two, may also be provided. A drive horn 30, such as one, may also be provided on the surface of the diaphragm 20 facing the sub-diaphragm 50, and it is located inside the acoustic cavity.

[0083] The presence of the acoustic cavity here can effectively improve the sound quality and effects of the picture frame speaker.

[0084] Here, there can be more than one secondary diaphragm 50. For example, two or more layers of secondary diaphragms can be set and parallel to each other, so that they can form more sound cavities, thereby improving the sound quality and effect.

[0085] In some alternative implementations, the volume of multiple acoustic cavities decreases sequentially in the direction away from the diaphragm, thereby further enhancing the bass effect.

[0086] Here, due to the obstruction of the secondary vibrating plate 50, such as Figure 25 As shown, the tweeter 40 is not visible on this side surface.

[0087] Example 7

[0088] refer to Figures 26 to 27 Embodiment 7 of this application provides a picture frame speaker.

[0089] The picture frame speaker of Embodiment Seven of this application is similar to the picture frame speaker of Embodiment One of this application, except that:

[0090] In the picture frame speaker of Embodiment Seven of this application, the picture frame 10 and the vibrating plate 20 are slidably connected, and the vibrating plate 20 can slide relative to the picture frame 10. In this way, the vibrating area of ​​the vibrating plate 20 can be adjusted, thereby adjusting the sound quality and sound effects.

[0091] Here, the frame 10 can be composed of two borders, top and bottom, so that the vibrating plate 20 can slide left and right relative to the two borders.

[0092] Example 8

[0093] refer to Figure 28 Embodiment 8 of this application provides a picture frame speaker.

[0094] The picture frame speaker of Embodiment 8 of this application is similar to the picture frame speaker of Embodiment 1 of this application, except that:

[0095] In the picture frame speaker of Embodiment 8 of this application, the vibrating plate 20 includes a curved surface. Specifically, the vibrating plate 20 may be entirely curved, such as an arcuate curved surface, or partially curved.

[0096] Optionally, at least one drive horn 30 may be mounted on the convex side of the curved surface.

[0097] Here, by making the diaphragm 20 into a curved surface, especially a parabolic arc surface, the vibration energy can be concentrated forward, enhancing the focusing of sound waves and making it suitable for long-distance sound generation. In addition, the curved surface can improve the rigidity distribution of the diaphragm 20 and improve its frequency response, such as increasing the resonant frequency of certain frequency bands (low frequencies are enhanced in the middle of the arc, and high frequencies are clearer at the edges).

[0098] Example 9

[0099] refer to Figures 29 to 30 Embodiment 9 of this application provides a picture frame speaker.

[0100] The picture frame speaker of Embodiment 9 of this application is similar to the picture frame speaker of Embodiment 1 of this application, except that:

[0101] The picture frame speaker in Embodiment 9 of this application further includes: a display screen 60, which is embedded in an opening in the vibrating plate 20.

[0102] Here, the area of ​​the display screen 60 can be less than 1 / 2, 1 / 3, or 1 / 4 of the area of ​​the vibrating plate 20. The type of display screen 60 includes, but is not limited to, an LCD screen or an OLED screen.

[0103] Furthermore, it also includes a battery, a boost module, a control module, and a communication module electrically connected to the display screen 60. The battery includes, but is not limited to, a lithium battery, such as a 3.7V lithium battery.

[0104] For example, double-sided tape can be used to attach the display screen 60 to one side of the vibrating plate 20, while hot melt adhesive can be used to fix components such as the control module (e.g., an Android motherboard) and battery on the other side to prevent shaking. Tape or soft adhesive can be used to secure the FPC cable to prevent bending and breakage (especially for TFT screen cables). The lithium battery (3.7V) is connected to the input of the boost module, boosting the voltage to 5V before outputting it to the Vin pin of the control module. The VCC pin of the display screen 60 is connected to the 5V output of the control module.

[0105] Example 10

[0106] refer to Figures 31 to 32 Embodiment 10 of this application provides a picture frame speaker.

[0107] The picture frame speaker of Embodiment 10 of this application is similar to the picture frame speaker of Embodiment 9 of this application, except that:

[0108] In the picture frame speaker of Embodiment 10 of this application, the display screen 60 is installed in the picture frame 10. This display screen 60 is larger than that of Embodiment 9, and it is arranged parallel to the vibrating plate 20, both being directly installed in the picture frame 10. Here, the larger display screen provides a better display effect.

[0109] Example 11

[0110] refer to Figures 33 to 35 Embodiment 11 of this application provides a picture frame speaker.

[0111] The picture frame speaker of Embodiment Eleven of this application is similar to the picture frame speaker of Embodiment One of this application, except that:

[0112] In the picture frame speaker of Embodiment Eleven of this application, the diaphragm 20 has a hole for mounting the driver speaker 30. The voice coil 33 of the driver speaker 30 passes through the hole in the diaphragm 20, and the adhesive ring 34 and the frame 38 are located on both sides of the diaphragm 20, respectively. In this way, the voice coil 33 is nested inside the diaphragm 20, resulting in better high frequencies during vibration.

[0113] like Figures 33 to 35 From the two opposing surfaces of the vibrating plate 20, the two ends of the driving horn 30 (one end of the horn 38 and one end of the adhesive ring 34) can be seen.

[0114] In the picture frame speaker of Embodiment 1, there are no holes on the diaphragm 20 corresponding to the position of the driver speaker 30, and the driver speaker 30 is directly attached to the diaphragm 20 through its adhesive ring 34.

[0115] Therefore, this application provides a picture frame speaker, and the main technical effects achieved by this application include:

[0116] (1) A frame-shaped speaker structure has been realized, which can achieve ultra-thinness, reduce space occupation, and is easy to be placed in various spaces;

[0117] (2) Using a driver speaker to drive the vibrating plate to produce sound by flat plate vibration can effectively increase the bass effect; at the same time, a tweeter can be further set up. The two work together to achieve good sound quality and sound effect across the entire frequency range.

[0118] (3) By using a driver speaker with dual driving force, the driving force is nearly doubled, thereby increasing the volume and sound quality while achieving a thinner and lighter design.

[0119] (4) This picture frame speaker can replace traditional speakers, reduce size and space occupation; it can be hung on the wall as a decoration; it can be embedded in paintings or photos; it can be used as a Bluetooth speaker; it can be used for home karaoke; etc.

[0120] The technical solution of this application has been described in detail above through specific embodiments. In the above embodiments, the descriptions of each embodiment have their own emphasis, and for parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0121] It should be understood that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Those skilled in the art can modify the technical solutions described in the above embodiments, or make equivalent substitutions for some of the technical features; however, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and protection scope of the technical solutions of the embodiments of this application.

Claims

1. A picture frame speaker comprising multiple layers of vibrating plates, characterized in that, include: Picture frame; The vibrating plate and the auxiliary vibrating plate are installed in the picture frame and form a sound cavity; A drive horn is mounted on the vibrating plate and configured to generate sound by mechanically vibrating the vibrating plate, but the drive horn itself does not generate sound directly.

2. The picture frame speaker including multi-layer vibrating plates according to claim 1, characterized in that, The drive horn has multiple horns, which are disposed on the same side surface of the vibrating plate, or separately disposed on the two sides surface of the vibrating plate.

3. The picture frame speaker including multi-layer vibrating plates according to claim 1, characterized in that, Further includes: A tweeter is mounted on the vibrating plate; The tweeter has a diaphragm configured to emit high frequencies relative to the diaphragm.

4. The picture frame speaker including multi-layer vibrating plates according to claim 3, characterized in that, The tweeter has multiple tweeters, which are disposed on the same side surface of the vibrating plate.

5. The picture frame speaker comprising multiple vibrating plates according to claim 1, characterized in that, The picture frame and the vibrating plate are slidably connected, and the vibrating plate can slide relative to the picture frame.

6. The picture frame speaker including multi-layer vibrating plates according to claim 1, characterized in that, The secondary vibrating plates are multiple and parallel to each other.

7. The picture frame speaker comprising multiple vibrating plates according to claim 1, characterized in that, The multiple auxiliary vibrating plates and the vibrating plate surround each other to form multiple sound cavities, and the volume of the multiple sound cavities decreases sequentially in the direction away from the vibrating plate.

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