Speaker and electronic device

Abstract

Embodiments of the present invention relate to the field of moving coil speakers, and disclose a speaker and an electronic device. The speaker in the present invention includes: a chassis, and a magnetic circuit system and a vibration system mounted on the chassis; the vibration system includes a voice coil bobbin, a coil surrounding the voice coil bobbin, and a dust cap pasted on the upper end of the voice coil bobbin; the dust cap is provided with a pasting portion parallel to the voice coil bobbin, and the pasting portion and the voice coil bobbin are bonded and fixed to each other. By increasing the bonding area between the pasting portion and the voice coil bobbin, the equivalent vibration radius of the dust cap can be reduced, and the resonance frequency of the fundamental resonance mode of the dust cap can be increased, thereby improving the high-frequency extension ability of the full-frequency speaker. Similarly, by reducing the bonding area between the pasting portion and the voice coil bobbin and increasing the equivalent vibration radius of the dust cap, the resonance frequency can be reduced. Through the above method, the present invention can realize the adjustment of the position of the high-frequency resonance peak, which is convenient for the full-frequency speaker to realize various different functions.

Description

Technical Field

[0001] Embodiments of the present invention relate to the field of moving coil speakers, and in particular to a speaker and an electronic device. Background Art

[0002] The current conventional speaker structure is as Figure 1 shown. In this structure, the dust cap 1 covers the upper end of the voice coil bobbin 21. The area of the fixing region between the dust cap and the voice coil bobbin is limited by the thickness of the voice coil bobbin and the inner diameter of the voice coil. Since the thickness of the voice coil bobbin and the inner diameter of the voice coil are strongly related to the high-frequency performance of the speaker, the thickness of the voice coil bobbin and the inner diameter of the voice coil cannot be changed arbitrarily, and thus the area of the fixing region between the dust cap and the voice coil bobbin cannot be adjusted.

[0003] The inventor found that the conventional speaker structure has the following problems: Since the area of the fixing region between the dust cap and the voice coil bobbin of the conventional speaker is small, the bonding state of the glue has a great influence on the left and right movement of the resonance peak position of the high-frequency cut-off frequency position of the speaker in this state. Since the current speaker structure cannot actively change the area of the fixing region between the dust cap and the voice coil bobbin of the speaker, there is a lack of a way to change the resonance frequency through the dust cap. Summary of the Invention

[0004] Embodiments of the present invention aim to provide a speaker and an electronic device, which can arbitrarily increase or decrease the resonance frequency of the basic resonance mode of the dust cap by adjusting the shape of the dust cap, thereby improving the high-frequency extension ability of the full-frequency speaker.

[0005] To solve the above technical problems, an embodiment of the present invention provides a speaker, including: a chassis, and a magnetic circuit system and a vibration system mounted on the chassis; the vibration system includes a voice coil bobbin, a coil wound around the voice coil bobbin, and a dust cap pasted on the upper end of the voice coil bobbin; the dust cap is provided with a pasting portion parallel to the voice coil bobbin, and the pasting portion is fixedly bonded to the voice coil bobbin.

[0006] An embodiment of the present invention further provides an electronic device, including: a housing and the above-mentioned speaker disposed inside the housing.

[0007] Compared with the prior art, the embodiment of the present invention is that the dust cap is provided with an adhesive portion parallel to the voice coil frame, and the adhesive portion and the voice coil frame are bonded and fixed to each other. Since the present invention improves the shape of the dust cap, the area of the adhesive portion in the dust cap can be freely adjusted, and then the area bonded to the voice coil frame can be adjusted. By increasing the bonding area between the adhesive portion and the voice coil frame, the equivalent vibration radius of the dust cap can be reduced, and the resonance frequency of the basic resonance mode of the dust cap can be increased, thereby improving the high-frequency extension capability of the full-range speaker. Similarly, the resonance frequency can also be reduced by reducing the bonding area between the adhesive portion and the voice coil frame and increasing the equivalent vibration radius of the dust cap. In the above manner, the present invention can achieve the adjustment of the high-frequency resonance peak position, which facilitates the full-range speaker to achieve a variety of different functions.

[0008] In addition, there is a gap between the bonding portion and the voice coil frame, which is used to accommodate the adhesive. This can prevent the adhesive from flowing to the non-bonded position and ensure that the adhesive does not affect the function of the speaker.

[0009] In addition, the voice coil frame further comprises: a glue hiding position, which is arranged below the bonding position between the voice coil frame and the bonding part, and is used to prevent the adhesive bonding the voice coil frame and the bonding part from flowing downward along the voice coil frame.

[0010] In addition, the dust cap further includes: an extension portion extending outward along the adhesive portion, the extension portion and the adhesive portion form a preset angle, and the larger the preset angle, the smaller the basic resonance frequency of the dust cap.

[0011] In addition, the preset angle is in the range of 0 degrees to 90 degrees.

[0012] In addition, the dust cap is made of a composite material consisting of aluminum material and foam material.

[0013] In addition, the composite material consists of three layers of material, and the foam material is located between two layers of aluminum material.

[0014] In addition, the greater the ratio of the equivalent Young's modulus of the composite material to the equivalent surface density of the composite material, the greater the fundamental resonance frequency of the dust cap.

[0015] In addition, the length of the adhesive portion is in the range of 0.5 mm to 3 mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0017] Figure 1 It is based on the structural diagram of a conventional speaker;

[0018] Figure 2 is a schematic structural diagram of a speaker according to an embodiment of the present invention;

[0019] Figure 3 is a schematic cross-sectional structural diagram of a speaker according to an embodiment of the present invention;

[0020] Figure 4 is a schematic diagram of the frequency response simulation results of a speaker according to an embodiment of the present invention and a conventional speaker;

[0021] Figure 5 is a schematic diagram of the frequency response simulation results in the ultrasonic frequency band of a speaker according to an embodiment of the present invention and a conventional speaker;

[0022] Figure 6 is a schematic diagram of the design parameters of a dust cap according to an embodiment of the present invention;

[0023] Figure 7 is a schematic diagram of the partial structure of a dust cap and a voice coil former according to an embodiment of the present invention;

[0024] Figure 8 is a schematic diagram of the frequency response simulation results at different α angles according to an embodiment of the present invention;

[0025] Figure 9 is a three-dimensional structural diagram of a dust cap according to an embodiment of the present invention;

[0026] Figure 10 is a schematic diagram of the composite material structure of a dust cap according to an embodiment of the present invention;

[0027] Figure 11 is a schematic diagram of the frequency response simulation results of a dust cap made of different composite materials according to an embodiment of the present invention;

[0028] Figure 12 is a diagram of the resonance mode simulation results of a conventional dust cap speaker;

[0029] Figure 13 is a diagram of the resonance mode simulation results of a dust cap speaker according to an embodiment of the present invention. Specific Embodiments

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will elaborate on each embodiment of the present invention with reference to the accompanying drawings. However, those of ordinary skill in the art can understand that in each embodiment of the present invention, many technical details are provided to help readers better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in the present application can still be implemented.

[0031] The following embodiments are divided for the convenience of description and should not constitute any limitation on the specific implementation of the present invention. The various embodiments can be combined with each other and referenced to each other under the premise of no contradiction.

[0032] An embodiment of the present invention relates to a loudspeaker, such as Figures 2 to 3 As shown, it includes: a basin frame 3, and a magnetic circuit system and a vibration system installed on the basin frame 3; the vibration system includes a voice coil frame 21, a coil 22 surrounding the voice coil frame 21, and a dust cap 1 pasted on the upper end of the voice coil frame 21; the dust cap 1 is provided with an adhesive portion parallel to the voice coil frame, and the adhesive portion and the voice coil frame are bonded and fixed to each other.

[0033] Compared with the prior art, the dust cap of the present invention is provided with an adhesive portion parallel to the voice coil frame, and the adhesive portion and the voice coil frame are bonded and fixed to each other. Since the shape of the dust cap is improved in the present invention, the size of the adhesive portion in the dust cap can be freely adjusted, and thus the area bonded to the voice coil frame can be adjusted, such as Figure 3 As shown, the contact area between the dust cap 1 and the voice coil bobbin 21 in this embodiment of the present invention is significantly increased. This can, on the one hand, reduce the dust cap's equivalent vibration radius and increase the resonant frequency of its fundamental resonant mode, thereby improving the high-frequency extension capability of the full-range speaker. On the other hand, it can also reduce the impact of the bonding condition on the resonant peak of the high-frequency dielectric frequency position, thereby improving the high-frequency yield of the speaker.

[0034] Conversely, the resonant frequency can be reduced by reducing the bonding area between the adhesive portion and the voice coil frame and increasing the minimum vibration radius of the dust cap. Through the above method, the present invention can adjust the resonance peak within the full frequency band, making it easier for the full-range speaker to achieve multiple different functions.

[0035] The embodiment of the present invention is based on the vibration principle of the circular vibration plate and realizes the design of the shape of the dust cap, so that the dust cap can generate basic resonance modes in the full frequency band. The basic resonance frequency of the circular vibration plate is as follows:

[0036] Among them, f 01 represents the basic resonant frequency; a represents the radius of the circular vibration plate; t represents the thickness of the circular vibration plate; E represents the elastic modulus of the material of the circular vibration plate; ρ represents the density of the circular vibration plate material; σ represents the Poisson's ratio of the circular vibration plate material.

[0037] The basic resonant frequency of the dust cap can be inferred from the basic resonant frequency of the circular vibration plate. However, the dust cap is not a standard circular flat plate compared to the circular vibration plate. Therefore, the shape of the dust cap will also affect its basic resonant frequency. Based on the principle of the circular vibration plate, the influence of the dust cap shape on its basic resonant frequency can be studied through finite element simulation.

[0038] The simulation results of the speaker's frequency response are as follows: Figures 4 to 5 As shown, Figure 4 The solid line represents the frequency response result obtained by the conventional dust cap design, and the dotted line represents the frequency response result of the dust cap designed in the embodiment of the present invention. Figure 5 Figure 1 shows the simulation results of the ultrasonic frequency response. The solid line represents the frequency response of a conventional dust cap design, while the dashed line represents the frequency response of the dust cap designed according to an embodiment of the present invention. The figure clearly shows that the ultrasonic frequency resonance peak of the dust cap designed according to an embodiment of the present invention is higher than that of the conventional dust cap design.

[0039] In addition, if Figures 6 to 7 ,as well as Figure 9 As shown, the dust cap further includes: an extension portion 12 extending outward along the adhesive portion 11, the extension portion 12 and the adhesive portion 11 form a preset angle ɑ, and the larger the preset angle ɑ, the smaller the basic resonance frequency of the dust cap.

[0040] In addition to adjusting the bonding length H of the adhesive portion 11 to change the effective vibration radius D of the dust cap, the predetermined angle α formed between the extension portion 12 and the adhesive portion 11 can also be adjusted. Adjusting these two parameters can adjust the frequency of the resonance peak. The predetermined angle can be adjusted from 0 to 90 degrees, and the adhesive portion length H can be adjusted from 0.5 mm to 3 mm. Parameter α has a much smaller impact on the fundamental resonant frequency of the dust cap than parameter H.

[0041] The frequency response simulation of the dust cap with different α angles is carried out, and the simulation results are as follows: Figure 8 As shown, the solid line represents the simulation result when α = 0 degrees, the dotted line represents the simulation result when α = 32 degrees, and the dashed line represents the simulation result when α = 90 degrees. It can be clearly seen from the figure that different parameters α have an impact on the basic resonant frequency of the dust cap.

[0042] In addition, there is a gap between the adhesive portion 11 and the voice coil frame 21, and the gap is used to accommodate the adhesive. This can prevent the adhesive from flowing to the non-bonded position, ensuring that the adhesive will not affect the function of the speaker. During the design, the outer diameter parameter of the dust cap and the inner diameter parameter of the voice coil frame can be designed to be the same value. At the same time, the inner diameter parameter of the voice coil frame is selected to have a positive tolerance during processing, while the outer diameter parameter of the dust cap is selected to have a negative tolerance during processing. That is, within the error range, the voice coil frame is made larger than the standard inner diameter parameter, and the dust cap is made smaller than the standard outer diameter parameter within the error range. Such processing can create a gap between the adhesive portion and the voice coil frame when the dust cap and the voice coil frame are assembled. Such a gap is just used to accommodate the adhesive, which can prevent the adhesive from being squeezed and flowing down along the voice coil frame to the non-bonded position. In order to make the dust cap match the voice coil frame for installation, such as Figure 6 As shown, a horizontal plane perpendicular to the adhesive portion 11 is added between the adhesive portion 11 and the extension portion 12 of the dust cap. The horizontal plane has a length L to achieve better fixation. In addition, an adhesive with suitable fluidity can also be selected to prevent the adhesive from flowing downward. The adhesive here can be a material that can have a bonding effect, such as glue.

[0043] In addition, if Figure 7 As shown, the voice coil bobbin may also be provided with a glue-receiving area 23. This area is located below the bonding point between the voice coil bobbin and the adhesive portion to prevent the adhesive from flowing downward along the voice coil bobbin. If the gap between the adhesive portion and the voice coil bobbin is appropriately designed and the fluidity of the adhesive is appropriately selected, this glue-receiving area 23 may be omitted.

[0044] In addition, the change of the material of the dust cap can also affect the frequency of the resonance peak. The material of the dust cap can be changed to a composite material composed of aluminum and foam material. Figure 10 As shown in the figure, the composite material consists of three layers of material, and the foam material is between two layers of aluminum material. The thickness and radius setting parameters of the dust cap are different under different composite materials, that is, Figure 6 The thickness T and radius R shown will be adjusted accordingly.

[0045] like Figure 11 The following table shows the frequency response simulation results of four composite materials with different mixing ratios. The parameters of the composite materials are shown in the following table:

[0046]

[0047] As can be seen from the figure, the greater the ratio of the composite material's equivalent Young's modulus to its equivalent surface density, the greater the dust cap's fundamental resonant frequency. Therefore, the dust cap's fundamental resonant frequency can be adjusted by changing the composite material's parameters.

[0048] In addition, due to the characteristics of the composite material, such as light weight, high strength and low density, using the composite material can also improve the sensitivity of the speaker.

[0049] Finally, compared with the conventional speaker, the simulation results of the mode of the speaker according to the embodiment of the present invention are as Figures 12 to 13 shown, where Figure 12 represents the simulation result of the resonance mode of the conventional dust cap speaker. As can be seen from the figure, the conventional dust cap speaker generates a basic resonance mode at 31445 Hz in the ultrasonic frequency band. And Figure 13 represents the simulation effect of the resonance mode of the speaker in the embodiment of the present invention. As can be seen from the figure, in the embodiment of the present invention, the resonance frequency of the basic resonance mode of the dust cap in the ultrasonic frequency band is increased to 34974 Hz, and the improvement effect is obvious.

[0050] In practical applications, the adjustment of the resonance frequency can be jointly achieved by combining the two aspects of adjusting the shape of the dust cap and adjusting the composite material of the dust cap. A controllable resonance peak is achieved in the ultrasonic frequency band of the full-range speaker through the two schemes, and the speaker has high sensitivity and high-frequency ductility.

[0051] In addition, as Figure 2 shown, in addition to the structures described above in the speaker, the magnetic circuit system further includes a magnetic conductive bowl 41, a magnetic conductive sheet 42, and a magnet 43, the vibration system further includes: a centering washer 5, and the speaker further includes: a surround 6 and a cone 7 and other components. The connection manner of these components can adopt the connection manner of the conventional speaker.

[0052] The embodiment of the present invention further relates to an electronic device, including: a housing and the above-mentioned speaker disposed in the housing. Due to the improvement of the dust cap in the speaker, the speaker has high sensitivity and high-frequency ductility, and the frequency response curve of the speaker can be extended above 20 kHz. The electronic device can use the speaker to implement an ultrasonic detection function.

[0053] The details of the implementation of the speaker in this embodiment are the same as those in the previous speaker embodiments, and the relevant technical details mentioned in the speaker embodiments are still valid in this embodiment. To avoid repetition, they will not be elaborated here.

[0054] Those of ordinary skill in the art can understand that the above embodiments are specific embodiments for implementing the present invention, and in practical applications, various changes can be made in form and details without departing from the spirit and scope of the present invention.

Claims

1. A loudspeaker, characterized in that, Comprising: A basin frame, and a magnetic circuit system and a vibration system mounted on the basin frame; the vibration system includes a voice coil bobbin, a coil surrounding the voice coil bobbin, and a dust cap pasted on the upper end of the voice coil bobbin; The dust cap is provided with a pasting portion parallel to the voice coil bobbin, and the pasting portion is fixedly bonded to the voice coil bobbin; The dust cap includes: an extension portion extending outward from the pasting portion, the extension portion forms a preset angle with the pasting portion, and the larger the preset angle, the smaller the fundamental resonance frequency of the dust cap.

2. The loudspeaker according to claim 1, wherein There is a gap between the pasting portion and the voice coil bobbin, and the gap is used to accommodate the adhesive.

3. The loudspeaker according to claim 1, wherein The voice coil bobbin includes: a glue storage position, which is arranged below the bonding position of the voice coil bobbin and the pasting portion, and is used to prevent the adhesive bonding the voice coil bobbin and the pasting portion from flowing downward along the voice coil bobbin.

4. The loudspeaker according to claim 1, characterized in that, The preset angle is in the range of 0 degrees to 90 degrees.

5. The loudspeaker according to claim 1, wherein The dust cap is made of a composite material composed of an aluminum material and a foaming material.

6. The loudspeaker according to claim 5, wherein The composite material is composed of three layers of materials, and the foaming material is between two layers of aluminum materials.

7. The loudspeaker according to claim 5 or 6, characterized in that, The larger the ratio of the equivalent Young's modulus of the composite material to the equivalent surface density of the composite material, the larger the fundamental resonance frequency of the dust cap.

8. The loudspeaker according to claim 1, characterized in that, The length of the pasting portion is in the range of 0.5 mm to 3 mm.

9. An electronic device, characterized in that, Comprising: a housing and a loudspeaker as described in any one of claims 1 to 8 provided in the housing.

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