A loudspeaker and amplification device

Abstract

This invention discloses a loudspeaker and amplification device. The loudspeaker includes a diaphragm and a waveguide structure. The diaphragm has an arc-shaped structure, and the waveguide structure partially covers the diaphragm. The side of the waveguide structure closest to the diaphragm is a curved surface consistent with the shape of the diaphragm, and the waveguide structure and the diaphragm are spaced apart by a first preset distance. This application solves the technical problem in the prior art of high-frequency missing or weak high-frequency timbre caused by the mismatch between the high-frequency radiation angle of the tweeter and the listening angle, by changing the shape of the waveguide structure to match the diaphragm and partially covering the diaphragm. This allows the radiation angle of the loudspeaker to be limited to within 90 degrees in the application frequency range, or to be an adjustable radiation angle not limited to 90 degrees, achieving the technical effects of variable radiation angle, controllable radiation angle centerline, and minimal high-frequency timbre loss.

Description

Technical Field

[0001] This invention relates to the field of loudspeaker technology, and more particularly to a loudspeaker and amplification device. Background Technology

[0002] Because tweeters radiate sound waves with short wavelengths and strong directivity, the best sound effect can only be obtained when the tweeter is directly in front of it. Shifting the direction will cause the sound pressure to gradually decrease, resulting in a poor listening experience. Summary of the Invention

[0003] This invention provides a loudspeaker and amplification device that solves the technical problem in the prior art of high-frequency loss or weak high-frequency timbre caused by the mismatch between the high-frequency radiation angle of the tweeter and the listening angle.

[0004] This invention provides a loudspeaker, which includes a diaphragm and a waveguide structure;

[0005] The diaphragm has an arc-shaped structure, and the waveguide structure is partially covered above the diaphragm. The arc-shaped structure includes one of the following: elliptical arc, circular arc, and parabolic arc.

[0006] The waveguide structure has a curved surface on the side closest to the diaphragm that matches the shape of the diaphragm, and the waveguide structure and the diaphragm are spaced apart by a first preset distance.

[0007] Furthermore, the loudspeaker also includes a Helmholtz resonator with a preset resonant frequency, wherein the preset resonant frequency is determined based on the frequency of the standing wave generated in the front cavity of the loudspeaker;

[0008] The Helmholtz resonator is embedded within the waveguide structure and is used to absorb the standing waves generated in the front cavity of the loudspeaker.

[0009] Furthermore, the area of ​​the waveguide structure covering the diaphragm accounts for 2 / 3 to 3 / 4 of the diaphragm area.

[0010] Furthermore, the first preset distance between the center point of the diaphragm and the waveguide structure Where x is the maximum vibration displacement of the diaphragm under rated power.

[0011] Furthermore, the Helmholtz resonator includes a short tube and a cavity;

[0012] The dimensions of the short tube are determined based on the dimensions of the waveguide structure, wherein the diameter of the short tube is 1-3 mm and the length of the short tube is 1-3 mm.

[0013] The dimensions of the cavity are determined based on the Helmholtz resonance frequency theory.

[0014] Furthermore, when the diameter d0 of the short tube is 1 mm, the length L of the short tube is 1.5 mm, and the preset resonant frequency is 9000 Hz, based on the Helmholtz resonant frequency theory formula... The volume of the cavity is determined to be V = 12.726 mm. 3 Where f0 is the resonant frequency of the Helmholtz resonator, S is the cross-sectional area of ​​the short tube, and S = π(d0 / 2). 2 ΔL=nd0, where n is an empirical parameter and c is the speed of sound.

[0015] Furthermore, the short tube is connected to one surface of the cavity, or the short tube is embedded in the cavity.

[0016] Furthermore, the loudspeaker also includes two frames and two voice coils, with the two frames connected to the diaphragm and respectively disposed on both sides of the diaphragm;

[0017] The two voice coils are respectively disposed on the two frames.

[0018] Furthermore, the loudspeaker also includes two frames, which are respectively disposed on both sides of the loudspeaker, and the waveguide structure is connected to one of the frames.

[0019] Furthermore, the speaker also includes a magnetic sheet, a magnet, and a magnetic cup;

[0020] The magnetic bowl has a concave structure and is disposed between the two basin holders;

[0021] The magnet is disposed inside the magnetic bowl, and the magnetic conductive sheet is disposed on the magnet;

[0022] The diaphragm is positioned above the magnetic sheet via two skeletons.

[0023] Furthermore, the loudspeaker also includes two surround structures, and the diaphragm is connected to the two frames respectively through the two surround structures;

[0024] The shape of the folded ring structure is one of the following: convex cap structure, concave cap structure, or flat plate structure.

[0025] This invention also provides a loudspeaker device, which includes the loudspeaker in any of the above embodiments.

[0026] This invention discloses a loudspeaker and amplification device. The loudspeaker includes a diaphragm and a waveguide structure. The diaphragm has an arc-shaped structure, and the waveguide structure partially covers the diaphragm. The side of the waveguide structure closest to the diaphragm is a curved surface consistent with the shape of the diaphragm, and the waveguide structure and the diaphragm are spaced apart by a first preset distance. This application solves the technical problem in the prior art of high-frequency missing or weak high-frequency timbre caused by the mismatch between the high-frequency radiation angle of the tweeter and the listening angle, by changing the shape of the waveguide structure to match the diaphragm and partially covering the diaphragm. This allows the radiation angle of the loudspeaker to be limited to within 90 degrees in the application frequency range, or to be an adjustable radiation angle not limited to 90 degrees, achieving the technical effects of variable radiation angle, controllable radiation angle centerline, and minimal high-frequency timbre loss. Attached Figure Description

[0027] Figure 1 This is a structural diagram of a loudspeaker with an unobstructed outer diaphragm provided in an embodiment of the present invention;

[0028] Figure 2 This is a sound pressure level curve of a loudspeaker with an unobstructed outer diaphragm, provided in an embodiment of the present invention.

[0029] Figure 3 This is a comparison diagram of the sound pressure level difference between the off-axis and positive axis of a loudspeaker with an unobstructed outer side of the diaphragm, provided in an embodiment of the present invention.

[0030] Figure 4 This is a structural diagram of a loudspeaker provided in an embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of a speaker mounted on a screen according to an embodiment of the present invention;

[0032] Figure 6 This is a sound pressure level curve of a loudspeaker with a curved waveguide provided in an embodiment of the present invention;

[0033] Figure 7 This is a structural diagram of another loudspeaker provided in an embodiment of the present invention;

[0034] Figure 8 This is a simulated sound pressure cloud map of a loudspeaker without a Helmholtz resonator provided in an embodiment of the present invention;

[0035] Figure 9 This is a simulated sound pressure cloud map of a loudspeaker equipped with a Helmholtz resonator provided in an embodiment of the present invention;

[0036] Figure 10 This is a structural diagram of a Helmholtz resonator provided in an embodiment of the present invention;

[0037] Figure 11 This is a structural diagram of another Helmholtz resonator provided in an embodiment of the present invention;

[0038] Figure 12 This is a structural diagram of another Helmholtz resonator provided in an embodiment of the present invention;

[0039] Figure 13 This is a sound pressure level curve provided in an embodiment of the present invention after adding a Helmholtz resonator;

[0040] Figure 14 These are the acoustic damping curves of Helmholtz resonators with different structures provided in the embodiments of the present invention;

[0041] Figure 15 These are sound pressure level curves of Helmholtz resonators with different structures provided in the embodiments of the present invention;

[0042] Figure 16 This is a directivity diagram of sound energy after adding a Helmholtz resonator, provided in an embodiment of the present invention;

[0043] Figure 17 This is a comparison curve of the sound pressure level before and after adding a Helmholtz resonator, provided in an embodiment of the present invention;

[0044] Figure 18 This is a schematic diagram of the folded ring structure of the convex cap structure provided in the embodiment of the present invention;

[0045] Figure 19 This is a schematic diagram of the concave cap structure of the folded ring provided in the embodiment of the present invention;

[0046] Figure 20 This is a schematic diagram of the folded ring structure of the flat plate structure provided in the embodiment of the present invention. Detailed Implementation

[0047] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0048] It should be noted that the terms "first," "second," etc., in the specification, claims, and drawings of this invention are used to distinguish different objects, not to limit a specific order. The various embodiments of this invention described below can be performed individually or in combination with each other; the embodiments of this invention do not impose specific limitations in this regard.

[0049] Because the tweeters installed on a television set are effectively used at a certain angle, the sound they can generally pick up is within a range of about 90 degrees off-axis from directly in front of the speaker. Under normal circumstances, such as... Figure 1As shown, the tweeter diaphragm is directly exposed with no obstruction on its outer side, allowing it to radiate sound directly. Such a speaker exhibits excellent sound pickup performance within a 0-90° angle. Figure 2 As shown, the sound pressure level curves exhibit significant differences, are quite dispersed, and lack convergence. This indicates that the pickup of high frequencies varies depending on the user's standing position, leading to different perceptions of high frequencies when the user moves to different locations, directly impacting the user's auditory comfort. From Figure 3 The differences in sound pressure radiation from different directions are clearly visible. Within the 0-90° angle range, the off-axis deviation shows a significant decreasing trend after 2000Hz compared to a 0° angle, with the rate of decrease accelerating as the angle increases. The difference in values ​​reaches over -30dB compared to a 0° angle. After 2000Hz, the curves show a clear dispersion and lack of convergence. Within the frequency range perceptible to the human ear, the 1000-4000Hz frequency range is the most sensitive. Clearly, the differences in sound pickup at different angles are significant.

[0050] Figure 4 This is a structural diagram of a loudspeaker provided in an embodiment of the present invention.

[0051] like Figure 4 As shown, the loudspeaker includes a diaphragm 10 and a waveguide structure 20; the diaphragm 10 is an arc-shaped structure, and the waveguide structure 20 is partially covered above the diaphragm 10. The arc-shaped structure includes one of the following: elliptical arc, circular arc, and parabolic arc; the side of the waveguide structure 20 closest to the diaphragm 10 is a curved surface with the same shape as the diaphragm 10, and the waveguide structure 20 and the diaphragm 10 are spaced apart by a first preset distance.

[0052] Specifically, see Figure 4 A curved waveguide structure 20 is disposed on the outer side of the diaphragm 10. The waveguide structure 20 is located in the front cavity of the speaker. The curved side of the waveguide structure 20 near the diaphragm 10 is designed to match the shape of the diaphragm 10. The diaphragm 10 is typically an arc-shaped structure, which can be any shape such as an elliptical arc, circular arc, or parabola. Other arc-shaped structures are also acceptable, and no limitation is placed here. In addition to the shape of the waveguide structure 20, it is also necessary to control that the waveguide structure 20 is partially covered above the diaphragm 10. The area of ​​the waveguide structure 20 covering the diaphragm 10 can be set as needed. Preferably, the area of ​​the waveguide structure 20 covering the diaphragm 10 accounts for 2 / 3 to 3 / 4 of the area of ​​the diaphragm 10. See [reference needed]. Figure 4 , Figure 4 An exemplary structural diagram is provided, showing that the area of ​​the waveguide structure 20 covering the diaphragm 10 is 3 / 4 of the area of ​​the diaphragm 10. By setting the waveguide structure 20 in this way, the radiation angle of the loudspeaker is limited to 90 degrees in the application frequency range, or is not limited to a 90-degree directional adjustable radiation angle.

[0053] Figure 5 This is a schematic diagram of a speaker mounted on a screen according to an embodiment of the present invention. Figure 5 As shown, since the terminal products where the speaker is located, such as smart TVs, typically have a narrow bezel structure, the speaker provided in this application, because the waveguide structure 20 partially covers the diaphragm 10, can meet the special shape design requirements of the narrow bezel structure. For example, Figure 5 The inner dashed lines shown represent the blocked diaphragm radiation area. By arranging the waveguide structure 20 in this way, the effective front radiation port of the speaker can be reduced by 50%-75%, making the structure and appearance of the speaker's terminal components simpler and more aesthetically pleasing.

[0054] Figure 6 This is a sound pressure level curve of a loudspeaker with a curved waveguide provided in an embodiment of the present invention, such as... Figure 6 and Figure 2 As shown, comparing the sound pressure level curves within the 0-90° angle range, the comparison... Figure 2 The high-frequency speaker in the middle has more concentrated data, and the data basically overlaps before 10000Hz. This means that the intensity of the sound waves radiated from different directions is consistent, and the sound effect perceived by the human ear is consistent, thus making the sound effect better.

[0055] Optionally, the first preset distance between the center point of the diaphragm and the waveguide structure Where x is the maximum vibration displacement of the diaphragm at rated power.

[0056] Specifically, regarding the height of the waveguide structure 20, generally speaking, the closer it is to the diaphragm 10, the better the sound effect. However, it is necessary to ensure the safe displacement of the speaker vibration, that is, to leave enough safe space for the vibration of the diaphragm 10. Therefore, the waveguide structure 20 and the diaphragm 10 are designed to be spaced at a first preset distance. Figure 1 The original loudspeaker had a waveguide structure and diaphragm distance of 0.8 mm. During the experiment, it was found that the smaller the first preset distance d1, the higher the frequency of the vibration trough, and the better the high-frequency enhancement effect. However, the design of the first preset distance d1 must ensure the safe displacement space for the diaphragm vibration. Therefore, the first preset distance between the center point of the diaphragm 10 and the waveguide structure 20 is...

[0057] This application solves the technical problem of high-frequency loss or weak high-frequency timbre caused by the mismatch between the high-frequency radiation angle and the listening angle in the prior art by changing the shape of the waveguide structure to match the diaphragm and partially covering the diaphragm with the waveguide structure. This allows the radiation angle of the speaker to be limited to within 90 degrees in the application frequency range, or to be adjustable in direction without being limited to 90 degrees. This achieves the technical effect of variable radiation angle, controllable radiation angle centerline and small loss of high-frequency timbre.

[0058] Figure 7 This is a structural diagram of another loudspeaker provided in an embodiment of the present invention.

[0059] Optionally, such as Figure 7 As shown, the loudspeaker also includes a Helmholtz resonator 30 with a preset resonant frequency, wherein the preset resonant frequency is determined based on the frequency of the standing wave generated in the front cavity of the loudspeaker; the Helmholtz resonator 30 is embedded in the waveguide structure 20 and is used to absorb the standing wave generated in the front cavity of the loudspeaker.

[0060] Specifically, such as Figure 6 As shown, Figure 4 A loudspeaker without a Helmholtz resonator 30 will exhibit a noticeable trough around 9000Hz. This trough is caused by the standing wave capability at a certain frequency in the loudspeaker's front cavity, resulting in fluctuations in the acoustic curve. Figure 8 This is a simulated sound pressure cloud map of a loudspeaker without a Helmholtz resonator provided in an embodiment of the present invention. Figure 8 It can be seen that, Figure 4 In a loudspeaker without a Helmholtz resonator 30, a noticeable standing wave exists in the front cavity at a frequency of 9kHz. Therefore, in order to eliminate the effect of standing waves and improve sound quality without affecting the effective frequency band, a Helmholtz resonator 30 is installed in the front cavity of the loudspeaker. This Helmholtz resonator 30 is located in the waveguide structure 20 and can absorb the standing waves generated in the front cavity, thereby improving the sound quality of the loudspeaker. Figure 9 This is a simulated sound pressure cloud map of a loudspeaker equipped with a Helmholtz resonator, provided in an embodiment of the present invention. Figure 9 It can be seen that the loudspeaker equipped with the Helmholtz resonator 30 has a significant absorption effect on the 9kHz frequency, and the standing wave is significantly improved.

[0061] It should be noted that the placement of the Helmholtz resonator 30 within the waveguide structure 20 is typically determined based on the simulated sound pressure level map of the loudspeaker. It can be placed at the critical point between positive and negative sound pressure levels, or at a location with relatively strong positive / negative sound pressure levels. Alternatively, it can be placed at a suitable location based on the shape of the waveguide structure 20 and the size of the Helmholtz resonator 30. The Helmholtz resonator 30 can be integrally formed with the waveguide structure 20 or be a separate structure; no restrictions are placed here.

[0062] Figure 10 This is a structural diagram of a Helmholtz resonator provided in an embodiment of the present invention. Figure 11 This is a structural diagram of another Helmholtz resonator provided in an embodiment of the present invention.

[0063] Optionally, such as Figure 10 and Figure 11As shown, the Helmholtz resonator 30 includes a short tube 31 and a cavity 32; the dimensions of the short tube 31 are determined based on the dimensions of the waveguide structure 20, wherein the diameter of the short tube 31 is 1-3 mm and the length of the short tube 31 is 1-3 mm; the dimensions of the cavity 32 are determined based on the Helmholtz resonance frequency theory. Optionally, as... Figure 10 As shown, the short tube 31 is connected to one surface of the cavity 32, or, as... Figure 11 As shown, the short tube 31 is embedded in the cavity 32. Optionally, the loudspeaker also includes a tuning mesh, which is disposed at the opening of the short tube 31 of the Helmholtz resonator 30; the tuning mesh is used to adjust the damping of the loudspeaker.

[0064] Figure 12 This is a structural diagram of another Helmholtz resonator provided in an embodiment of the present invention, as shown below. Figure 12 As shown, the Helmholtz resonator can also be a structure without the short tube 31, with only an opening on the cavity 32.

[0065] Specifically, the Helmholtz resonator 30 includes a short tube 31 and a cavity 32. When subjected to sound waves, the air inside the short tube 31 vibrates, and the air inside the cavity 32 exerts a restoring force on it. When the wavelength of the sound wave is much larger than the geometric dimensions of the resonator, it can be considered that the kinetic energy of the air vibration within the resonator is concentrated within the short tube 31, and the kinetic potential energy of the air within it is only related to the elastic deformation of the air inside the cavity 32. Therefore, the Helmholtz resonator is a one-dimensional vibration system composed of the effective mass of the air inside the short tube 31 and the elasticity of the air inside the cavity 32, and thus exhibits resonance with the applied sound waves. This resonance phenomenon can be used to cancel standing waves of the corresponding frequency, thereby eliminating standing waves generated in the front cavity.

[0066] Specifically, the diameter d0 and length L of the short tube 31 can be determined based on the dimensions of the waveguide structure 20. For example, Figure 7 The diameter of the short tube 31 shown is 1-3 mm, and the length of the short tube 31 is 1-3 mm, which can be determined based on the height and cross-sectional area of ​​the loudspeaker waveguide structure 20.

[0067] Preferably, when the diameter d0 of the short tube 31 is 1 mm, the length L of the short tube 31 is 1.5 mm, and the preset resonant frequency is 9000 Hz, the resonant frequency is based on the Helmholtz resonant frequency theory formula. The volume of cavity 32 is determined to be V = 12.726 mm. 3 Where f0 is the resonant frequency of the Helmholtz resonator, S is the cross-sectional area of ​​the short tube 31, and S=π(d0 / 2). 2 ΔL=nd0, where n is an empirical parameter and c is the speed of sound.

[0068] Specifically, under the action of a sound wave of a certain intensity, the vibration velocity of the air inside the short tube 21 is the maximum at the resonant frequency. Furthermore, considering the radiated sound waves from the short tube 31, the length of the short tube needs to be corrected. The correction method is to increase the length ΔL = nd0, where n is an empirical parameter. For Figure 10 , Figure 11 and Figure 12 Regarding the three different structures of Helmholtz resonators shown, Figure 10 When the short tube is not inserted into the cavity, the empirical parameter n = 0.73; Figure 11 When the short tube is inserted into the cavity, the empirical parameter n = 0.61; Figure 12 When there is no short pipe but only an opening, the empirical parameter n = 0.85.

[0069] When the diameter d of the short tube 31 is 1 mm and the length L of the short tube 31 is 1.5 mm, in order to eliminate Figure 6 The trough value appears near 9000Hz. The preset resonant frequency is set to 9000Hz. At this point, based on the Helmholtz resonant frequency theory formula... The volume of cavity 32 can be determined to be V = 12.726 mm. 3 Furthermore, based on the volume V of cavity 32, the height of the cavity is determined to be 1.2 mm and the diameter to be 3.675 mm. The sound pressure level curve of the loudspeaker at this point is as follows: Figure 13 As shown, Figure 13 This is a sound pressure level curve diagram after adding a Helmholtz resonator, provided in an embodiment of the present invention. See [link / reference]. Figure 13 As can be seen, after adding the Helmholtz resonator 30, the trough value near 9000Hz is significantly absorbed, and the sound pressure level at that point increases.

[0070] against Figure 10 , Figure 11 as well as Figure 12 Simulations were performed on three different structures of Helmholtz resonators. Figure 14 These are the acoustic damping curves of Helmholtz resonators with different structures provided in the embodiments of the present invention. Figure 15 These are sound pressure level curves of Helmholtz resonators with different structures provided in embodiments of the present invention. Wherein, HR represents the Helmholtz resonator, and HR1, HR2, and HR3 respectively represent... Figure 10 , Figure 11 , Figure 12 The Helmholtz resonator in the middle.

[0071] Preferably, by Figure 14 It can be seen that, at a resonant frequency of 9000Hz, the acoustic damping curves of the three HR values ​​are different. Figure 15It can be seen that the smaller the acoustic damping of the HR, the larger the peak value of the curve, and the more obvious the absorption of sound waves. However, an excessively high absorption rate will cause the curve to change from a trough to a peak. Therefore, in actual design, HR optimization needs to be performed based on simulation calculations. In the actual simulation process of this embodiment, HR1 has the most obvious absorption effect at the 9000Hz frequency, and the standing wave is significantly improved; HR2 has too high an absorption rate, resulting in a relatively obvious peak value; HR3 has insufficient absorption rate, and the curve still has obvious trough values; according to the optimization results, HR1 has the best effect.

[0072] It should be noted that in actual product design, the standing wave frequency to be eliminated is determined based on actual needs and simulation calculations. Since the bandwidth of the absorption frequency of the Helmholtz resonator is relatively narrow, multiple Helmholtz resonators can also be set, and there is no restriction here.

[0073] Figure 16 This is a directivity diagram of sound energy after adding a Helmholtz resonator, provided in an embodiment of the present invention. Figure 17 This is a comparison curve of the sound pressure level before and after adding a Helmholtz resonator, provided in an embodiment of the present invention.

[0074] like Figure 16 As shown, after adding the Helmholtz resonator 30, the difference between the off-axis and positive axis is between -2 and 10 dB, and the sound pressure level of the off-axis is significantly improved across the entire frequency band. Figure 17 As shown, Figure 17 The curve Original represents the sound pressure level without a waveguide structure, while HR1 represents the sound pressure level with an added waveguide structure. Figure 10 The sound pressure diagram for the waveguide structure shown in the figure shows that after improving the shape of the waveguide structure and adding a Helmholtz resonator, not only can the overall sound pressure level in the range of 1000-20000Hz be improved, but the directivity of the sound capability within a 90° angle is also significantly improved, achieving the technical effect of variable radiation angle, controllable radiation angle centerline and low high-frequency timbre loss.

[0075] Optionally, such as Figure 7 As shown, the loudspeaker also includes two frames 40 and two voice coils 50. The two frames 40 are connected to the diaphragm 10 and are respectively disposed on both sides of the diaphragm 10.

[0076] Two voice coils 50 are respectively set on two frames 40.

[0077] Optionally, such as Figure 7 As shown, the loudspeaker also includes two frames 60, which are respectively disposed on both sides of the loudspeaker, and the waveguide structure 50 is connected to one of the frames 60.

[0078] Optionally, such as Figure 7 As shown, the loudspeaker also includes a magnetic sheet 70, a magnet 80, and a magnetic cup 90;

[0079] The magnetic bowl 90 has a concave structure and is positioned between the two basin holders 60;

[0080] Magnet 80 is placed inside magnetic bowl 90, and magnetic conductive sheet 70 is placed on magnet 80;

[0081] The diaphragm 10 is positioned above the magnetic sheet 70 via two skeletons 40.

[0082] Specifically, for a moving-coil loudspeaker, a current-carrying conductor experiences a force in a magnetic field. A changing current passing through the coil generates a changing magnetic field, which drives the loudspeaker's diaphragm to vibrate, compressing air and thus producing sound. The frame 60, magnetic sheet 70, magnet 80, and voice coil 90 together constitute the loudspeaker's magnetic circuit system, while the diaphragm 10, frame 40, and voice coil 50 together constitute the loudspeaker's vibration system.

[0083] Optionally, such as Figure 7 As shown, the loudspeaker also includes two surround structures 100, and the diaphragm 10 is connected to two frames 60 respectively through the two surround structures 100;

[0084] The shape of the folded ring structure 100 is one of the following: convex cap structure, concave cap structure, or flat plate structure.

[0085] Specifically, Figure 18 This is a schematic diagram of the folded ring structure of the convex cap structure provided in an embodiment of the present invention. Figure 19 This is a schematic diagram of the concave cap structure of the folded ring provided in an embodiment of the present invention. Figure 20 This is a schematic diagram of the folded ring structure of the flat plate structure provided in the embodiment of the present invention. The folded ring structure 100 and the diaphragm 10 can be integrally formed or they can be separate structures. No limitation is made here.

[0086] This invention also provides a loudspeaker device, which includes the loudspeaker in any of the above embodiments.

[0087] The loudspeaker provided in this embodiment of the invention includes the loudspeaker in the above embodiment. Therefore, the loudspeaker provided in this embodiment of the invention also has the beneficial effects described in the above embodiment, which will not be repeated here.

[0088] In the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0089] Finally, it should be noted that the above are merely preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A loudspeaker, characterized in that, The loudspeaker includes a diaphragm and a waveguide structure; The diaphragm has an arc-shaped structure, and the waveguide structure is partially covered above the diaphragm. The arc-shaped structure includes one of the following: elliptical arc, circular arc, and parabolic arc. The side of the waveguide structure closest to the diaphragm is a curved surface that matches the shape of the diaphragm, and the waveguide structure and the diaphragm are spaced apart by a first preset distance; The loudspeaker also includes a Helmholtz resonator with a preset resonant frequency, wherein the preset resonant frequency is determined based on the frequency of the standing wave generated in the front cavity of the loudspeaker; The Helmholtz resonator is embedded within the waveguide structure and is used to absorb the standing waves generated in the front cavity of the loudspeaker. The placement of the Helmholtz resonator in the waveguide structure is determined based on the simulated sound pressure cloud map of the loudspeaker. The placement conditions include one of the following: placing it at the critical position of positive / negative sound pressure, placing it at a position with strong positive / negative sound pressure, or selecting a placement location that is feasible according to the shape of the waveguide structure and the size of the Helmholtz resonator.

2. The loudspeaker according to claim 1, characterized in that, The area of ​​the waveguide structure covering the diaphragm accounts for 2 / 3 to 3 / 4 of the diaphragm area.

3. The loudspeaker according to claim 1, characterized in that, The first preset distance d1 between the center point of the diaphragm and the waveguide structure is greater than or equal to the first preset distance d1. , where x is the maximum vibration displacement of the diaphragm under rated power.

4. The loudspeaker according to claim 1, characterized in that, The Helmholtz resonator includes a short tube and a cavity; The dimensions of the short tube are determined based on the dimensions of the waveguide structure, wherein the diameter of the short tube is 1-3 mm and the length of the short tube is 1-3 mm. The dimensions of the cavity are determined based on the Helmholtz resonance frequency theory.

5. The loudspeaker according to claim 4, characterized in that, When the diameter d0 of the short tube is 1 mm, the length L of the short tube is 1.5 mm, and the preset resonant frequency is 9000 Hz, based on the Helmholtz resonant frequency theory formula... The volume of the cavity is determined to be V = 12.726 mm. 3 Where f0 is the resonant frequency of the Helmholtz resonator, S is the cross-sectional area of ​​the short tube, and S = π(d0 / 2). 2 ΔL=nd0, where n is an empirical parameter and c is the speed of sound.

6. The loudspeaker according to claim 4, characterized in that, The short tube is connected to one surface of the cavity, or the short tube is embedded in the cavity.

7. The loudspeaker according to claim 1, characterized in that, The loudspeaker also includes two frames and two voice coils, with the two frames connected to the diaphragm and respectively disposed on both sides of the diaphragm; The two voice coils are respectively disposed on the two frames.

8. The loudspeaker according to claim 7, characterized in that, The loudspeaker also includes two frames, which are respectively disposed on both sides of the loudspeaker, and the waveguide structure is connected to one of the frames.

9. The loudspeaker according to claim 8, characterized in that, The speaker also includes a magnetic sheet, a magnet, and a magnetic cup; The magnetic bowl has a concave structure and is disposed between the two basin holders; The magnet is disposed inside the magnetic bowl, and the magnetic conductive sheet is disposed on the magnet; The diaphragm is positioned above the magnetic sheet via two of the aforementioned skeletons.

10. The loudspeaker according to claim 9, characterized in that, The loudspeaker also includes two surround structures, and the diaphragm is connected to the two frames respectively through the two surround structures; The shape of the folded ring structure is one of the following: convex cap structure, concave cap structure, or flat plate structure.

11. A loudspeaker device, characterized in that, The amplification device includes the loudspeaker described in any one of claims 1-10.

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