Diffusion cover and tweeter

Abstract

A diffusion cover for a loudspeaker, and a tweeter. The diffusion cover comprises an outer fixing member, and a diffusion ring arranged directly in front of a diaphragm of the loudspeaker, wherein the diffusion ring is located in the outer fixing member, and the diffusion ring comprises a first diffusion portion and a second diffusion portion; on a first plane perpendicular to the front-rear direction, the orthographic projections of the first diffusion portion and the second diffusion portion are both continuous and closed rings; on the cross-section of the diffusion cover in the front-rear direction, the first diffusion portion is gradually inclined backwards from the outside in, the second diffusion portion is gradually inclined forwards from the outside in, and an inner edge of the first diffusion portion and an outer edge of the second diffusion portion are fixedly connected or integrated; the outer fixing member is connected to an outer edge of the first diffusion portion via connecting strips arranged at intervals, so as to form a first channel for sound to pass therethrough; and an inner edge of the second diffusion portion encloses a second channel for sound to pass therethrough. In the diffusion cover and the tweeter, the sound diffusion effect is optimized, and the high-frequency range sounds more prominent and clearer.

Description

Diffuser cover and high-pitched loudspeaker Related Applications

[0001] This application claims priority to Chinese patent application No. CN 2024110757721 filed on August 7, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present disclosure relates to the field of loudspeakers, in particular to a diffuser cover of a loudspeaker and a high-pitched loudspeaker. BACKGROUND

[0003] High-pitched loudspeakers are mostly configured with a panel to protect the front of the diaphragm of the high-pitched loudspeaker. For example, a high-pitched loudspeaker disclosed in patent CN218772420U includes a support, a magnetic circuit system, a sound film, and a voice coil; the high-pitched loudspeaker further includes a panel covering the sound film, the panel being connected to the support, the panel being provided with sound transmission holes, the main body part of the panel (the part located in front of the sound film) being formed by a plurality of bars extending in the diameter direction and being connected by intersection, and the sound transmission holes being formed by the plurality of bars. Such a panel does not help much in the diffusion of sound, and the panel can only physically protect the sound film, i.e., it can only prevent the sound film from being deformed or even damaged due to external pressure or collision.

[0004] The above information disclosed in the background section is only for the purpose of enhancing the understanding of the background of the present application, and therefore it can include information known to those of ordinary skill in the art. SUMMARY

[0005] The present disclosure relates to a diffuser cover of a loudspeaker and a high-pitched loudspeaker having the diffuser cover, which optimizes the diffusion of sound and makes the high-frequency part more prominent and clear.

[0006] A first aspect of the present disclosure provides a diffuser cover of a loudspeaker, comprising an outer fixing member and a diffusion ring configured to be arranged in front of a diaphragm of the loudspeaker, the diffusion ring being located in the outer fixing member; the diffusion ring comprises a first diffusion part and a second diffusion part; in a first plane perpendicular to the front-rear direction, the orthographic projections of the first diffusion part and the second diffusion part are both continuous and closed annular; in a cross section of the diffuser cover along the front-rear direction, the first diffusion part gradually inclines backward from outside to inside, the second diffusion part gradually inclines forward from outside to inside, and the inner edge of the first diffusion part and the outer edge of the second diffusion part are fixedly connected or integrated; the outer fixing member and the outer edge of the first diffusion part are connected by connection strips arranged at intervals to form a first channel for sound to pass through; and the inner edge of the second diffusion part encloses a second channel for sound to pass through.

[0007] In some embodiments, the width of the front projection of the diffusion ring is greater than one fourth of the inner diameter of the outer fixing member on the first plane. In other embodiments, the width of the front projection of the diffusion ring is greater than one fourth of the inner diameter of the outer fixing member and less than two thirds of the inner diameter of the outer fixing member.

[0008] In some embodiments, the first diffusion part is overall a forward large and rear small truncated cone shape. In some embodiments, the second diffusion part is overall a forward small and rear large truncated cone shape.

[0009] In some embodiments, the thickness of the first diffusion part, the second diffusion part and the connecting strip are uniform and equal.

[0010] In some embodiments, the front projection of the connecting strip extends along the diameter direction of the diffusion cover on the first plane; and the connecting strip is overall an upward arched circular arc shape in the cross section.

[0011] In some embodiments, a through hole is formed on the diffusion ring, and the through hole penetrates the diffusion ring along the front-rear direction.

[0012] In some embodiments, a plurality of through holes are formed on the diffusion ring, and the plurality of through holes are arranged at intervals along the circumference direction of the diffusion ring.

[0013] In some embodiments, a first part of the through hole is located on the first diffusion part, and a second part of the through hole is located on the second diffusion part. In a specific embodiment, the through hole is formed by the first part and the second part, and the area of the first part is equal to the area of the second part.

[0014] A second aspect of the present disclosure provides a high-frequency loudspeaker, comprising a support, a diaphragm and the diffusion cover described above, the outer fixing member is fixedly connected with the support, and the diaphragm is located at the rear side of the diffusion cover.

[0015] In some embodiments, the diaphragm comprises a folding ring, a first vibration part and a second vibration part arranged in sequence from outside to inside, the folding ring is connected to the support, the first vibration part is located at the rear side of the first diffusion part, and the second vibration part is located at the rear side of the second diffusion part; in the cross section of the high-frequency loudspeaker along the front-rear direction, the first vibration part gradually inclines backward from outside to inside, and the second vibration part gradually inclines forward from outside to inside.

[0016] In some embodiments, in the cross section, the first vibration part and the first diffusion part are overall parallel to each other, and the second vibration part and the second diffusion part are overall parallel to each other.

[0017] In some embodiments, the first vibration part and the second vibration part are integrated, and the voice coil is connected to the inner edge of the first vibration part and / or the outer edge of the second vibration part; the support is provided with an annular groove in which a magnetic circuit assembly is arranged, and the groove opening of the annular groove faces the front direction of the folded ring and / or the first vibration part.

[0018] In some embodiments, the diaphragm further comprises an inner connecting edge connected to the inner edge of the second vibration part, and the inner connecting edge is connected to the support through a limiting column or is fixed to the magnetic circuit assembly on the support.

[0019] In some embodiments, the tweeter does not comprise a positioning support piece (also referred to as a dome).

[0020] A third aspect of the present disclosure provides a vehicle audio system comprising a tweeter, wherein the tweeter comprises the above-mentioned diffusion cover; or, the tweeter is the above-mentioned tweeter.

[0021] The diffusion cover and the tweeter employing the diffusion cover of the present disclosure improve the diffusion effect of the high-frequency band, reduce sound distortion, and improve sound quality; and enhance the clarity and audibility of the high-frequency part.

[0022] The tweeter of the present disclosure does not need to be provided with a positioning support piece / dome and the like, the limiting column plays a centering and limiting role on the diaphragm, and at the same time, can also avoid foreign matters such as water vapor and dust from entering the inside of the tweeter, thereby affecting the performance of the internal components such as the magnetic circuit assembly and the voice coil; and is more conducive to miniaturization of the tweeter, and the application of the tweeter on a vehicle is more convenient and flexible, and installation space is saved. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the present disclosure, the drawings needed in the following embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can also be obtained by those skilled in the art without creative labor.

[0024] FIG. 1 is a perspective view of a tweeter according to Embodiment 1 of the present disclosure.

[0025] FIG. 2 is an exploded view of a tweeter according to Embodiment 1 of the present disclosure.

[0026] FIG. 3 is a cross-sectional view of a tweeter according to Embodiment 1 of the present disclosure along the front-rear direction.

[0027] FIG. 4 is a perspective view of a diffusion cover according to Embodiment 1 of the present disclosure.

[0028] FIG. 5 is a perspective view of a tweeter of Comparative Example 1.

[0029] Fig. 6 is a perspective view of the high-frequency loudspeaker of Comparative Example 2.

[0030] Fig. 7 is a frequency response curve diagram of Comparative Example 1, Comparative Example 2 and the embodiments.

[0031] Fig. 8 is a perspective view of a high-frequency loudspeaker according to Embodiment 2 of the present disclosure.

[0032] Fig. 9 is a front view of a high-frequency loudspeaker according to Embodiment 2 of the present disclosure.

[0033] Fig. 10 is a sectional view along A-A in Fig. 9.

[0034] Fig. 11 is a frequency response curve diagram of the high-frequency loudspeakers of Embodiment 1 and Embodiment 2.

[0035] wherein,

[0036] 1, diffuser cover; 11, outer fixing member; 12, diffuser ring; 121, first diffuser part; 122, second diffuser part; 13, connecting strip; 14, first channel; 15, second channel; 16, through hole; 161, first part; 162, second part;

[0037] 2, bracket; 21, outer cylinder; 22, annular groove; 23, inner cylinder;

[0038] 3, diaphragm; 31, folded ring; 32, first vibration part; 33, second vibration part; 34, inner connecting edge;

[0039] 4, voice coil;

[0040] 5, magnetic circuit assembly; 50, magnetic gap; 51, U-shaped iron; 52, magnetic steel; 53, front piece; 531, mounting groove;

[0041] 6, limiting post. DETAILED DESCRIPTION

[0042] The preferred embodiments of the present disclosure will be described in detail with reference to the drawings, so that the advantages and features of the present disclosure can be more easily understood by those skilled in the art. It should be noted that the description of these embodiments is intended to help understand the present disclosure, but does not constitute a limitation of the present disclosure. In addition, the technical features involved in the various embodiments of the present disclosure described below can be combined with each other as long as they do not conflict with each other.

[0043] In this document, "inner" and "outer" are defined with reference to the vibration axis (center line of the voice coil) of the high-frequency loudspeaker, with the position closer to the vibration axis being inner and the position farther from the vibration axis being outer. The words "upper" and "lower" are intended to facilitate understanding of the structure of the vehicle-mounted bass speaker by those skilled in the art, and are not used to limit the state after the high-frequency loudspeaker is installed (for example, installed in a vehicle).

[0044] In addition, herein, the term "high frequency" refers to sound in the frequency range of 10,000 Hz or above; and the term "high frequency speaker" refers to a speaker that plays sound concentrated in the frequency range of 10,000 Hz or above.

[0045] The drawings of FIGS. 1-4 and 8-9 are drawn to scale, and for the sake of brevity, the scale of each element is not listed one by one, but the scale and position of each element should be taken as part of the content of this specification. Embodiment 1

[0046] This embodiment provides a high frequency speaker and a diffuser for a speaker. Referring to FIGS. 1-3, the high frequency speaker mainly includes a diffuser 1, a bracket 2, a diaphragm 3, a voice coil 4, and a magnetic circuit assembly 5. The diffuser 1 is fixed on the bracket 2, the diaphragm 3 is fixed in the bracket 2, one end (front end) of the voice coil 4 is fixed to the middle part of the diaphragm 3, and the coil part (rear part) of the voice coil 4 is inserted into the magnetic gap 50 of the magnetic circuit assembly 5. The magnetic circuit assembly 5 provides a magnetic field for the coil in the magnetic gap 50. When the voice coil 4 is connected to an audio electrical signal, under the action of electromagnetic induction, the voice coil 4 moves in the magnetic gap 50, thereby driving the diaphragm 3 to vibrate, realizing the electro-acoustic conversion. It should be noted that the voice coil 4 drives the diaphragm 3 to reciprocate along a vibration axis, thereby emitting sound; the vibration axis coincides with the center line (extending in the front-rear direction) of the voice coil 4. The various components of the high frequency speaker are described in detail below.

[0047] With reference to Fig. 4, the diffusion cover 1 comprises an outer fixing member 11 and a diffusion ring 12 arranged in front of the diaphragm 3 of the loudspeaker. The outer fixing member 11 is generally annular and is sleeved on the support 2, and the two are fixed to each other. The diffusion ring 12 is located in the outer fixing member 11 and is fixed to the diffusion cover 1 by a plurality of connecting strips 13. The diffusion cover 1 can be an integrally formed component, for example, a plastic component formed by injection molding. The diffusion ring 12 comprises a first diffusion portion 121 and a second diffusion portion 122. In a first plane perpendicular to the front-rear direction, taking the first plane as a reference plane, the reference plane is perpendicular to the vibration axis, the first diffusion portion 121 and the second diffusion portion 122 are both continuous and closed annular in the reference plane. In the cross section of the diffusion cover 1 along the front-rear direction (the second plane where the vibration axis is located), the first diffusion portion 121 gradually tilts backward from outside to inside, and the second diffusion portion 122 gradually tilts forward from outside to inside. The inner edge of the first diffusion portion 121 and the outer edge of the second diffusion portion 122 are fixedly connected or integrated, and further, the inner edge of the first diffusion portion 121 and the outer edge of the second diffusion portion 122 are connected, and there is no gap between the two. Specifically, the outer fixing member 11 and the outer edge of the first diffusion portion 121 are connected by the connecting strips 13 arranged at intervals to form a first passage 14 for sound to pass through, and the first passage 14 is generally fan annular in the reference plane. The inner edge of the second diffusion portion 122 encloses a second passage 15 for sound to pass through, and the second passage 15 is generally circular in the reference plane.

[0048] In the first plane, the width of the projection of the diffusion ring 12 is greater than one fourth of the inner diameter of the outer fixing member 11. That is, when the tweeter is viewed from the front side, at least half of the effective radiation area of the diaphragm 3 is blocked by the diffusion ring 12. Preferably, in the first plane, the width of the projection of the diffusion ring 12 is less than two thirds of the inner diameter of the outer fixing member 11. The first diffusion portion 121 is generally a truncated cone with a large front and a small back, and the second diffusion portion 122 is generally a truncated cone with a small front and a large back. The thicknesses of the first diffusion portion 121, the second diffusion portion 122, and the connecting strips 13 are uniform and equal. Here, the "width" refers to the distance between the inner and outer edges of the diffusion ring 12, that is, the distance between the outer edge of the first diffusion portion 121 and the inner edge of the second diffusion portion 122.

[0049] In the first plane, the connecting strips 13 are strip-shaped, and the projection (length direction) of the connecting strips 13 extends along the diameter direction of the diffusion cover 1. The plurality of connecting strips 13 are arranged at intervals along the outer circumferential direction of the diffusion cover 1. In the cross section shown in Fig. 3, the connecting strips 13 are generally circular arc-shaped with the middle part arched upward.

[0050] As shown in Fig. 3, the support 2 is provided with an annular groove 22 around the magnetic circuit assembly 5. Specifically, the support 2 comprises an outer cylinder 21 and an inner cylinder 23 arranged in the outer cylinder 21, the rear end of the outer cylinder 21 and the rear end of the inner cylinder 23 are connected to form the annular groove 22. The height of the outer cylinder 21 is greater than the height of the inner cylinder 23, so that the front end of the outer cylinder 21 protrudes forward relative to the front end of the inner cylinder 23. The outer fixing member 11 is connected to the outer cylinder 21.

[0051] The diaphragm 3 comprises, from outside to inside, a folded ring 31, a first vibrating part 32 and a second vibrating part 33. The folded ring 31 is connected to the outer cylinder 22 of the support 2 and / or the outer fixing member 11 of the diffuser cover 1; specifically, the outer edge of the folded ring 31 is clamped between the outer fixing member 11 of the diffuser cover 1 and the outer cylinder 22 of the support 2, so as to suspend the diaphragm 3 on the support 2. The first vibrating part 32 is located at the rear side of the first diffusing part 121, and the second vibrating part 33 is located at the rear side of the second diffusing part 122. In the cross section of the high-frequency loudspeaker along the front-rear direction, the first vibrating part 32 gradually inclines backward from outside to inside, and the second vibrating part 33 gradually inclines forward from outside to inside. Further, in the cross section along the vibration axis (as shown in Fig. 3), the first vibrating part 32 and the first diffusing part 121 are parallel to each other as a whole, and the second vibrating part 33 and the second diffusing part 122 are parallel to each other as a whole. That is, the distance between the diffusing ring 12 and the first / second vibrating part 32 / 33 of the diaphragm 3 is substantially equal everywhere, where the "distance" refers to the distance along the vibration axis between the diffusing ring 12 and the first / second vibrating part 32 / 33 of the diaphragm 3.

[0052] The first vibrating part 32 and the second vibrating part 33 are integrated, and the first vibrating part 32 and the second vibrating part 33 can be made of pulp, fiber, polymer material, etc. by an integrated molding process. The front end of the voice coil 4 is connected to the inner edge of the first vibrating part 32 and / or the outer edge of the second vibrating part 33, for example, by gluing. The annular groove 21 of the support 2 has an opening facing the folded ring 31 and / or the first vibrating part 32 in front of it.

[0053] The diaphragm 3 further comprises an inner connecting edge 34, which is connected to the inner edge of the second vibrating part 33, and is fixed to the magnetic circuit assembly 5 on the support 2 through the limiting post 6. In the example shown in the drawings, the limiting post 6 is fixed to the magnetic circuit assembly 5. The magnetic circuit assembly 5 comprises a U-shaped iron 51, a magnetic steel 52 and a front sheet 53. The magnetic steel 52 and the front sheet 53 are arranged in the U-shaped iron 51 and form a ring-shaped magnetic gap 50 between the inner side surface of the U-shaped iron 51. The outer side surface of the U-shaped iron 51 is fixed in the inner cylinder 23 of the support 2, for example by gluing; and the front sheet 53 is fixed on the front side surface of the magnetic steel 52. The magnetic circuit assembly 5 (specifically, the middle part of the front sheet 53) is provided with a mounting groove 531, and the bottom of the limiting post 6 is inserted and fixed in the mounting groove 531. The top of the limiting post 6 and the inner edge of the inner connecting edge 34 are fixed, for example by gluing. The tweeter is a small-sized speaker without positioning pieces / bellows, and the diaphragm 3 is centered and limited by the limiting post 6, so as to prevent the diaphragm 3 from shaking in directions other than the expected direction (the direction of the vibration axis).

[0054] The tweeter is typically a vehicle-mounted tweeter, which is one of the components of the car audio system and is used to play high-frequency sounds. The tweeter is fixed to the structural member of the vehicle through the outer fixing member 11 or the support 2.

[0055] Comparative Example 1

[0056] Comparative Example 1 provides a tweeter, which is different from the embodiment only in the diffuser cover 1. Specifically, as shown in FIG. 5, compared with the embodiment, the diffuser cover 1 of Comparative Example 1 has the following structural features: (1) in the cross section along the vibration axis, the diffuser ring 12 is flat, and the lower surface thereof is a plane perpendicular to the vibration axis; (2) in the first plane perpendicular to the vibration axis, the width of the orthographic projection of the diffuser ring 12 is less than one fourth of the distance between the fixing members.

[0057] Comparative Example 2

[0058] Comparative Example 2 provides a tweeter, which is different from the embodiment only in the diffuser cover 1. Specifically, as shown in FIG. 6, compared with the embodiment, the diffuser cover 1 of Comparative Example 2 has the following structural features: (1) in the cross section along the vibration axis, the diffuser ring 12 is flat, and the lower surface thereof is a plane perpendicular to the vibration axis; (2) in the first plane perpendicular to the vibration axis, the width of the orthographic projection of the diffuser ring 12 is less than one fourth of the distance between the fixing members; (3) the diameter of the second passage 15 surrounded by the diffuser ring 12 is smaller than that of the embodiment and Comparative Example 1.

[0059] Sound production performance comparison between Example 1 and Comparative Examples 1 and 2:

[0060] The sound performance of the high-frequency loudspeakers of Example 1, Comparative Example 1 and Comparative Example 2 of the same specification (the dimensions of the primary diffuser cover 1, diaphragm 3 and support 2 and other components are equal) was evaluated, and the frequency response curves of the three are shown in FIG. 7. Referring to FIG. 7, the high-frequency loudspeaker of Example 1 has a better response in the high-frequency part, and at the same time can bring a better listening experience of high-pitched sound.

[0061] The high-frequency loudspeaker using the diffuser cover 1 of Example 1 has the following advantages: through a special structure to optimize the diffusion effect of sound, the listening experience in the high-frequency part is more prominent and clear, the diffusion effect in the high-frequency band is improved, the sound distortion is reduced, and the sound quality is improved; the clarity and audibility of the high-frequency part are enhanced. There is no need to set a positioning support / elastic wave, the limiting column 6 plays a centering and limiting role for the diaphragm 3, and at the same time, it can also avoid the entry of foreign matters such as water vapor and dust into the interior of the loudspeaker, affecting the performance of the internal components such as the magnetic circuit assembly 5 and the voice coil 4; it is more conducive to miniaturization of the high-frequency loudspeaker, and the application on vehicles is more flexible and convenient, saving installation space. Example 2

[0062] Referring to FIGS. 8 to 10, the difference between the high-frequency loudspeaker of the present embodiment and Example 1 is that the diffuser cover 1 of the present embodiment is provided with a through hole 16. Specifically, the through hole 16 penetrates the diffuser ring 1 along the front-rear direction. The diffuser ring 1 is provided with a plurality of through holes 16, and the plurality of through holes 16 are arranged at intervals along the circumferential direction of the diffuser ring 1. Among them, the first part 161 of the through hole 16 is located on the first diffusion part 121, and the second part 162 of the through hole 16 is located on the second diffusion part 122. Specifically, the through hole 16 is formed by the first part 161 and the second part 162, and the area of the first part 161 and the area of the second part 162 are equal. Seen along the vibration axis direction, the through hole 16 is a circular hole, that is, the orthographic projection of the through hole 16 in the above-mentioned first plane is circular, and the orthographic projections of the first part 161 and the second part 162 are semicircular respectively.

[0063] Comparison of sound performance of Examples 1 and 2:

[0064] The sound performance of the high-frequency loudspeakers of Example 1 and Example 2 of the same specification (the dimensions of the primary diffuser cover 1, diaphragm 3 and support 2 and other components are equal) was evaluated, and the frequency response curves of the two are shown in FIG. 11. Referring to FIG. 11, the high-frequency loudspeaker of Example 2 using the porous diffuser cover has a wider frequency range; while in the high-frequency part of 18 kHz, the peak value of the folded ring type diffuser of Example 1 is higher, and the sensitivity difference is larger.

[0065] The features of the embodiments of the present disclosure are stated in the following clauses:

[0066] 1. A diffuser cover of a loudspeaker, comprising:

[0067] an outer fixing member; and

[0068] a diffusion ring configured to be disposed in front of a diaphragm of the loudspeaker, the diffusion ring being located in the outer fixing member;

[0069] wherein the diffusion ring comprises a first diffusion portion and a second diffusion portion; in a first plane perpendicular to the front-rear direction, the first diffusion portion and the second diffusion portion are both continuous and closed annular projections; in a cross section of the diffusion cover along the front-rear direction, the first diffusion portion gradually inclines backward from outside to inside, the second diffusion portion gradually inclines forward from outside to inside, and the inner edge of the first diffusion portion and the outer edge of the second diffusion portion are fixedly connected or integrated; the outer fixing member and the outer edge of the first diffusion portion are connected by the spaced connection strips to form a first passage for sound to pass through; and the inner edge of the second diffusion portion encloses a second passage for sound to pass through.

[0070] 2. The diffusion cover of clause 1, wherein, in the first plane, the projection of the diffusion ring has a width greater than one fourth of the inner diameter of the outer fixing member.

[0071] 3. The diffusion cover of clause 1 or 2, wherein the first diffusion portion is a truncated cone shape as a whole with a larger front and a smaller back.

[0072] 4. The diffusion cover of any one of clauses 1 to 3, wherein the second diffusion portion is a truncated cone shape as a whole with a smaller front and a larger back.

[0073] 5. The diffusion cover of any preceding clause, wherein the thickness of the first diffusion portion, the second diffusion portion, and the connection strips are uniform and equal.

[0074] 6. The diffusion cover of any preceding clause, wherein, in the first plane, the projection of the connection strips extends along the diameter direction of the diffusion cover; and in the cross section, the connection strips are circular arc shapes as a whole with an upward arch.

[0075] 7. The diffusion cover of any preceding clause, wherein a through hole is formed in the diffusion ring, the through hole penetrating the diffusion ring along the front-rear direction.

[0076] 8. The diffusion cover of clause 7, wherein a plurality of through holes are formed in the diffusion ring, the plurality of through holes being spaced apart along the circumference direction of the diffusion ring.

[0077] 9. The diffusion cover of clause 7 or 8, wherein a portion of the through hole is located on the first diffusion portion, and another portion of the through hole is located on the second diffusion portion.

[0078] 10. A tweeter, comprising:

[0079] support;

[0080] diaphragm; and

[0081] The diffusion cover according to any one of the preceding claims;

[0082] The outer fixing member and the support are fixedly connected, and the diaphragm is located at the rear side of the diffusion cover.

[0083] 11. The tweeter according to clause 10, wherein the diaphragm comprises, from outside to inside, a folded ring, a first vibrating part and a second vibrating part, the folded ring is connected to the support, the first vibrating part is located at the rear side of the first diffusion part, and the second vibrating part is located at the rear side of the second diffusion part; in a cross section of the tweeter along the front-rear direction, the first vibrating part gradually inclines rearward from outside to inside, and the second vibrating part gradually inclines forward from outside to inside.

[0084] 12. The tweeter according to clause 11, wherein, in the cross section, the first vibrating part and the first diffusion part are parallel to each other as a whole, and the second vibrating part and the second diffusion part are parallel to each other as a whole.

[0085] 13. The tweeter according to any one of clauses 11 or 12, wherein the first vibrating part and the second vibrating part are integral, and a voice coil is connected to an inner edge of the first vibrating part and / or an outer edge of the second vibrating part; the support is provided with an annular groove in which a magnetic circuit assembly is arranged, and an opening of the annular groove faces the folded ring and / or the first vibrating part in the front direction.

[0086] 14. The tweeter according to any one of clauses 11 to 13, wherein the diaphragm further comprises an inner connecting edge connected to an inner edge of the second vibrating part, and the inner connecting edge is connected to the support through a limiting column or to a magnetic circuit assembly fixed on the support.

[0087] 15. The tweeter according to any one of clauses 10 to 13, wherein the tweeter does not comprise a positioning tab.

[0088] 16. A vehicle audio system comprising a tweeter, the tweeter comprising the diffusion cover according to any one of clauses 1 to 9; or the tweeter is the tweeter according to any one of clauses 10 to 15.

[0089] As shown in the specification and claims, the term "comprise" and "include" only indicate the inclusion of the steps and elements explicitly identified, and these steps and elements do not constitute an exclusive list, and the method or device can also include other steps or elements.

[0090] It is to be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. It is further understood that "multiple" means two or more, and other quantifiers are similar.

[0091] It is further understood that the terms "first," "second," etc. are used to describe various information and do not imply an order or importance of the information. In fact, the terms "first," "second," etc. are used interchangeably. For example, the first information can be referred to as the second information, and similarly, the second information can be referred to as the first information without departing from the scope of the disclosure.

[0092] In the present disclosure, unless specifically stated and limited otherwise, "on" or "under" of a first feature with respect to a second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "on top of" of a first feature with respect to a second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is horizontally higher than the second feature. "Under", "below" and "underneath" of a first feature with respect to a second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is horizontally lower than the second feature.

[0093] The above-described embodiments are only preferred embodiments of the present disclosure, which are used to illustrate the technical concepts and characteristics of the present disclosure, and the purpose is to enable those skilled in the art to understand the content of the present disclosure and implement it, and cannot be used to limit the protection scope of the present disclosure.

Claims

1. A diffusion cover of a loudspeaker, comprising: an outer fixing member; and a diffusion ring configured to be arranged in front of a diaphragm of the loudspeaker, the diffusion ring being located in the outer fixing member; wherein the diffusion ring comprises a first diffusion portion and a second diffusion portion; in a first plane perpendicular to a front-rear direction, the first diffusion portion and the second diffusion portion are both continuous and closed annular projections; in a cross section of the diffusion cover along the front-rear direction, the first diffusion portion gradually inclines rearward from outside to inside, the second diffusion portion gradually inclines forward from outside to inside, and an inner edge of the first diffusion portion and an outer edge of the second diffusion portion are fixedly connected or integrated; the outer fixing member and the outer edge of the first diffusion portion are connected by spaced connection strips to form a first passage for sound to pass through; and an inner edge of the second diffusion portion encloses a second passage for sound to pass through. In the first plane, a width of the projection of the diffusion ring is greater than one fourth of an inner diameter of the outer fixing member.

2. The diffusion cover of claim 1, wherein, The first diffusion portion is a truncated cone shape as a whole with a larger front and a smaller rear.

3. Diffusion shield according to claim 1 or 2, characterized in that The second diffusion portion is a truncated cone shape as a whole with a smaller front and a larger rear.

4. Diffuser cover according to any one of claims 1 to 3, characterized in that Thicknesses of the first diffusion portion, the second diffusion portion and the connection strips are uniform and equal.

5. A diffuser boot according to any preceding claim, characterised in that, In the first plane, the projection of the connection strip extends along a diameter direction of the diffusion cover; and in the cross section, the connection strip is a circular arc shape as a whole with an upward arch.

6. A diffuser boot according to any preceding claim, characterised in that, A through hole is formed in the diffusion ring and penetrates the diffusion ring along the front-rear direction.

7. A diffuser boot according to any preceding claim, characterised in that, A plurality of through holes are formed in the diffusion ring and are spaced along a circumferential direction of the diffusion ring.

8. The diffusion cover of claim 7, wherein, A portion of the through hole is located on the first diffusion portion, and another portion of the through hole is located on the second diffusion portion.

9. Diffusion shield according to claim 7 or 8, characterized in that 10.A tweeter, comprising: a support; a diaphragm; and a diffusion cover according to any one of the preceding claims; wherein the outer fixing member and the support are fixedly connected, and the diaphragm is located at a rear side of the diffusion cover. The diaphragm comprises, from outside to inside, a folded ring, a first vibration portion and a second vibration portion, the folded ring is connected to the support, the first vibration portion is located at a rear side of the first diffusion portion, and the second vibration portion is located at a rear side of the second diffusion portion; in a cross section of the tweeter along a front-rear direction, the first vibration portion gradually inclines rearward from outside to inside, and the second vibration portion gradually inclines forward from outside to inside. In the cross section, the first vibration portion and the first diffusion portion are parallel to each other as a whole, and the second vibration portion and the second diffusion portion are parallel to each other as a whole.

11. The tweeter of claim 10, wherein, The first vibration portion and the second vibration portion are integrated, and a voice coil is connected to an inner edge of the first vibration portion and / or an outer edge of the second vibration portion; the support is provided with an annular groove in which a ring-shaped magnetic circuit assembly is arranged, and a slot opening of the annular groove faces the folded ring and / or the first vibration portion in a front direction.

12. The tweeter of claim 11, wherein, The diaphragm further comprises an inner connecting edge connected to an inner edge of the second vibration portion, and the inner connecting edge is connected to the support or a magnetic circuit assembly fixed on the support by a limiting column.

13. The tweeter loudspeaker of claim 11 or 12, wherein, The tweeter does not comprise a positioning support piece.

14. The high frequency loudspeaker of any of claims 11 to 13, wherein, ​ 15. The high frequency loudspeaker of any of claims 10 to 13, wherein, ​ 16. A car audio system comprising a tweeter comprising the diffuser cover according to any one of claims 1 to 9; or, the tweeter is the tweeter according to any one of claims 10 to 15.

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