Speaker box and electronic device

Abstract

A speaker box (100) and an electronic device. The speaker box (100) comprises: a housing (110), which has a receiving space; and a speaker unit (120) and a foam sound-absorbing sheet (130), which are received in the receiving space, wherein the speaker unit (120) and the housing (110) enclose a rear cavity (140), and the foam sound-absorbing sheet (130) is adhered to the inner wall surface of the rear cavity (140); and the foam sound-absorbing sheet (130) comprises a foam block (131) and sound-absorbing powder (132) adhered to the foam block (131). Providing the foam sound-absorbing sheet (130) can effectively reduce the resonance frequency of the speaker and improve the acoustic performance, and the speaker has a stable structure and is simple to manufacture.

Description

Speaker boxes and electronic equipment Technical Field

[0001] The embodiments of the present invention belong to the field of electroacoustic technology, and particularly relate to a speaker box and electronic equipment. Background Art

[0002] As electronic devices become increasingly lighter and thinner, the components in electronic devices are also getting thinner. This structural change causes the volume of the rear cavity in the speaker box assembly to become smaller and smaller, the thickness to become thinner, the speaker resonant frequency to increase, and the sensitivity to decrease, affecting the speaker's acoustic performance.

[0003] To address these issues, related technologies fill the back cavity with sound-absorbing materials, virtually increasing the volume, lowering the resonant frequency, and improving acoustic performance. Sound-absorbing materials are often manufactured in granular form, but in practice, granular sound-absorbing materials present high production costs and complex processes. Furthermore, static electricity during assembly and filling can prevent the back cavity from being fully filled. The collision of particles under the high-frequency vibrations of sound waves can also lead to failure risks such as powder loss and breakage.

[0004] Other existing solutions involve bonding sound-absorbing powder into blocks with adhesives. However, these blocks can easily collide with the back cavity wall, causing them to break and crack. This problem is particularly severe when the blocks are only 0.2mm to 1mm thick. When using sound-absorbing powder to form blocks, the blocks do not adhere firmly to the double-sided tape and easily fall off, making them impractical to reinforce with tape. Summary of the Invention

[0005] The embodiments of the present invention aim to solve at least one of the technical problems existing in the prior art and provide a speaker box and an electronic device.

[0006] In one aspect, an embodiment of the present invention provides a speaker box, comprising a housing having a receiving space, a speaker unit received in the receiving space, and a foam sound-absorbing sheet; the speaker unit and the housing are arranged to form a rear cavity, and the foam sound-absorbing sheet is adhered to the inner wall of the rear cavity; wherein,

[0007] The foam sound-absorbing sheet comprises a foam block and sound-absorbing powder adhered to the foam block.

[0008] Optionally, the foam block is adhered to the inner wall of the rear cavity through an adhesive.

[0009] Optionally, the foam block is an open-pore foam, and its open pores are exposed in the rear cavity.

[0010] Optionally, the density of the foam block is in the range of 10 mg / cm 3 ~100mg / cm 3 , and / or,

[0011] The thickness of the foam block ranges from 0.2 mm to 5 mm.

[0012] Optionally, the foam block is one of melamine foam or polyurethane foam, and the cells in the foam block with a pore size of less than 0.5 mm account for more than 90% of all cells.

[0013] Optionally, the adhesive member is a double-sided tape, and the thickness of the double-sided tape ranges from 0.02 mm to 0.2 mm.

[0014] Optionally, the sound-absorbing powder and the adhesive are mixed to form a water-based emulsion, and the water-based emulsion is impregnated into the foam block and then dried to connect the foam block to the support surface of the foam block.

[0015] Optionally, the adhesive is one or more of polyacrylate, styrene-butadiene emulsion, polystyrene acrylate, polystyrene acetate, polyurethane resin and polyethylene acetate.

[0016] Optionally, the sound-absorbing powder is a zeolite material composed of one or more of MFI, MEL and FER with a Si / M ratio greater than 100 and a particle size less than 10 μm; wherein,

[0017] The M includes one or more of Al, Fe, B, and Ga.

[0018] On the other hand, an embodiment of the present invention provides an electronic device, which includes the speaker box described above.

[0019] The speaker box and electronic equipment of the embodiments of the present invention can effectively reduce the resonance frequency and improve the acoustic performance by adhering a foam sound-absorbing sheet to the inner wall of the rear cavity. It can also improve the performance stability of the speaker box during operation and prevent the sound-absorbing block from colliding with the inner wall, thereby causing powder loss and breakage. In addition, by adhering sound-absorbing powder to the foam block and adhering the foam block with sound-absorbing powder to the double-sided tape, the problem that the double-sided tape cannot fix the sound-absorbing block can be effectively solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG1 is a schematic structural diagram of a speaker box according to an embodiment of the present invention;

[0021] FIG2 is a cross-sectional schematic diagram of a foam sound-absorbing sheet connected to an adhesive member according to another embodiment of the present invention;

[0022] FIG3 is a cross-sectional schematic diagram of a foam block connected to an adhesive member according to another embodiment of the present invention;

[0023] FIG. 4 is a SEM image of the surface of a foam sound-absorbing sheet according to another embodiment of the present invention. Implementation Method

[0024] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0025] As shown in FIG1 , a speaker box 100 includes a housing 110 having a receiving space, a speaker unit 120 received in the receiving space, and a foam sound-absorbing sheet 130. The speaker unit 120 and the housing 110 enclose a rear cavity 140, and the foam sound-absorbing sheet 130 is adhered to the inner wall of the rear cavity 140.

[0026] Specifically, as shown in Figure 1, a speaker unit 120 is housed within a housing 110. The speaker unit 120 and a portion of the inner wall of the housing 110 enclose a rear cavity 140. A foam sound-absorbing sheet 130 is adhered to the inner bottom wall of the rear cavity 140. The thickness of the foam sound-absorbing sheet 130 depends on the thickness of the rear cavity 140, and a gap exists between the upper surface of the foam sound-absorbing sheet 130 and the inner top wall of the rear cavity 140. As an example, the thickness of the gap between the upper surface of the foam sound-absorbing sheet 130 and the inner top wall of the rear cavity 140 can be set to 0.05 mm to 0.3 mm. The upper surface of the foam sound-absorbing sheet 130 was observed using a scanning electron microscope (SEM), and the observation results are shown in Figure 4.

[0027] It should be noted that, as shown in FIG. 1 to FIG. 3 , the foam sound-absorbing sheet 130 includes a foam block 131 and sound-absorbing powder 132 adhered to the foam block 131 .

[0028] The speaker enclosure of the present invention, by attaching a foam sound-absorbing sheet to the inner wall of the rear cavity, effectively reduces the resonant frequency and improves acoustic performance. Furthermore, by attaching sound-absorbing powder to the foam block, the speaker enclosure's operational stability is enhanced, preventing the block from colliding with the inner wall, which could cause powder loss and breakage.

[0029] Exemplarily, as shown in Figures 1 to 3, under the condition that the foam sound-absorbing sheet 130 includes a foam block 131 and sound-absorbing powder 132 adhered to the foam block 131, the foam block 131 is adhered to the inner wall of the rear cavity 140 through the adhesive 150.

[0030] Specifically, as shown in Figures 1 to 3, sound-absorbing powder 132 is adhered to the foam block 131. The bottom of the foam block 131 is directly adhered to one side of the double-sided tape along its thickness, and the other side of the double-sided tape is directly adhered to the inner bottom wall of the rear cavity 140 along its thickness. Of course, the adhesive member can also be other adhesive materials other than double-sided tape, as long as they can adhere the foam block to the rear cavity, such as glue, etc. This embodiment does not impose specific restrictions on this. As a specific example, the thickness of the double-sided tape ranges from 0.02mm to 0.2mm, and the density of the foam block 131 ranges from 10mg / cm 3 ~100mg / cm 3 The thickness of the foam block 131 ranges from 0.2 mm to 5 mm. By setting the thickness range of the double-sided tape and the foam block in this way, the sum of the thicknesses of the two can reach a minimum of 0.22 mm, which is suitable for ultra-thin speaker cavities.

[0031] It should be noted that, during application, the appropriate thickness of double-sided tape and foam block 131 must be selected based on the thickness of rear cavity 140. Once the thickness of rear cavity 140 is determined, the thicker the foam block 131, the thinner the double-sided tape. This allows for more sound-absorbing powder 132 to adhere, resulting in better performance, but it is also more susceptible to shedding.

[0032] The speaker enclosure of the present invention effectively solves the problem of double-sided tape being unable to secure the sound-absorbing block by adhering sound-absorbing powder inside the foam block and adhering the powdered foam block to double-sided tape. This allows for reinforcement using double-sided tape and prevents the block from colliding with the rear cavity wall, causing powder loss and breakage. Adhering a thin foam sound-absorbing sheet to the rear cavity wall effectively reduces the resonant frequency, improves acoustic performance, and enhances the stability of the speaker enclosure during operation.

[0033] Furthermore, as shown in Figures 2 and 3, the foam block 131 is an open-pore and hydrophilic foam, with its open pores exposed in the rear cavity 140. As a specific example, the foam block 131 is one of melamine foam or polyurethane foam, and the pores in the foam block 131 have a pore size of less than 0.5 mm and account for more than 90% of all pores. The foam block configured in this way can more effectively reduce the resonant frequency and improve the acoustic performance. In addition, it can better adhere to the sound-absorbing powder, preventing the sound-absorbing powder from falling off when the speaker box is operating, thereby improving the performance stability of the speaker box during operation.

[0034] Exemplarily, as shown in FIG. 2 , the sound-absorbing powder 132 and the adhesive are mixed to form a water-based emulsion, which is then impregnated into the foam block 131 and then dried to be connected to the support surface 133 of the foam block 131 .

[0035] Specifically, the sound-absorbing powder 132 and a binder are mixed to form a water-based emulsion slurry. The sound-absorbing powder 132 is agglomerated into agglomerates under the action of the binder. The water-based emulsion slurry is then impregnated into a foam block 131. The agglomerated and unagglomerated sound-absorbing powder 132 are then bonded to the support surface 133 of the foam block 131, i.e., the skeleton of the foam block 131, by the action of the binder. The water is then removed through freeze-drying and high-temperature drying processes to obtain the desired foam sound-absorbing sheet 130, in which the foam block 131 and the sound-absorbing powder 132 are adhered and connected.

[0036] Furthermore, the binder is one or more of polyacrylate, styrene-butadiene emulsion, polystyrene acrylate, polystyrene acetate, polyurethane resin, and polyethyl vinyl acetate. The sound-absorbing powder 132 is a zeolite material having a Si / M ratio greater than 100, a particle size less than 10 μm, and a structure composed of one or more of MFI, MEL, and FER. The M element includes one or more of Al, Fe, B, and Ga.

[0037] The speaker box of the embodiment of the present invention can effectively adhere the sound-absorbing powder to the foam block through the water-emulsion base liquid formed by blending. The foam block with the sound-absorbing powder adhered to the double-sided tape can solve the problem that the double-sided tape cannot fix the sound-absorbing block material. At the same time, the foam sound-absorbing sheet adhered to the inner wall of the rear cavity improves the performance stability of the speaker box during operation, and can prevent the sound-absorbing block material formed by the agglomeration of the sound-absorbing powder from colliding with the inner wall, thereby causing powder falling and breakage.

[0038] On the other hand, the present invention further provides an electronic device, which includes the speaker box described above. The specific structure of the speaker box can be referred to the relevant description above and will not be described in detail here.

[0039] In electronic devices according to embodiments of the present invention, a foam sound-absorbing sheet is adhered to the inner wall of the speaker box's rear cavity, effectively reducing the resonant frequency and improving acoustic performance. Furthermore, sound-absorbing powder is adhered to the foam block, and the powder-coated foam block is adhered to double-sided tape, effectively resolving the problem of double-sided tape being unable to secure the sound-absorbing block. Furthermore, the foam sound-absorbing sheet adhered to the inner wall of the rear cavity improves the speaker box's operational stability and prevents the sound-absorbing block from colliding with the inner wall, which could cause powder loss and breakage.

[0040] It will be understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present invention, and the present invention is not limited thereto. Those skilled in the art will appreciate that various modifications and improvements can be made without departing from the spirit and substance of the present invention, and such modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A speaker box, characterized in that: The speaker box comprises a shell having a receiving space, a speaker unit received in the receiving space, and a foam sound-absorbing sheet; the speaker unit and the shell are arranged to form a rear cavity, and the foam sound-absorbing sheet is adhered to the inner wall of the rear cavity; wherein, The foam sound-absorbing sheet comprises a foam block and sound-absorbing powder adhered to the foam block.

2. The speaker box according to claim 1, characterized in that: The foam block is adhered to the inner wall of the rear cavity through an adhesive.

3. The speaker box according to claim 1, characterized in that: The foam block is an open-cell foam, and its open cells are exposed in the rear cavity.

4. The speaker box according to claim 1, characterized in that The density range of the foam block is 10 mg / cm 3 ~100mg / cm 3 , and / or, The thickness of the foam block ranges from 0.2 mm to 5 mm.

5. The speaker box according to claim 1, characterized in that: The foam block is one of melamine foam or polyurethane foam, and the pores with a pore size of less than 0.5 mm in the foam block account for more than 90% of all the pores.

6. The speaker box according to claim 2, characterized in that: The adhesive member is a double-sided tape, and the thickness of the double-sided tape ranges from 0.02 mm to 0.2 mm.

7. The speaker box according to any one of claims 1 to 6, characterized in that: The sound-absorbing powder and the adhesive are mixed to form a water-based emulsion, and the water-based emulsion is impregnated into the foam block and then dried to connect the foam block to the support surface of the foam block.

8. The speaker box according to claim 7, characterized in that: The adhesive is one or more of polyacrylate, styrene-butadiene emulsion, polystyrene acrylate, polystyrene acetate, polyurethane resin and polyethyl vinyl acetate salt.

9. The speaker box according to any one of claims 1 to 6, characterized in that: The sound-absorbing powder is a zeolite material composed of one or more of MFI, MEL and FER with a Si / M ratio greater than 100 and a particle size less than 10 μm; wherein, The M includes one or more of Al, Fe, B, and Ga.

10. An electronic device, characterized in that: The electronic device comprises the speaker box according to any one of claims 1 to 9.

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