Diffusion cover and high pitch loudspeaker

Abstract

The utility model discloses a diffusion cover and a high pitch loudspeaker. The diffusion cover comprises an outer fixing piece and a diffusion ring arranged right in front of a vibrating diaphragm of the loudspeaker, and the diffusion ring is located in the outer fixing piece; the diffusion ring comprises a first diffusion part and a second diffusion part; on a first plane perpendicular to the front-back direction, orthographic projections of the first diffusion part and the second diffusion part are in a continuous and closed ring shape; on the cross section of the diffusion cover in the front-back direction, the first diffusion part gradually inclines backwards from outside to inside, the second diffusion part gradually inclines forwards 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 piece is connected with the outer edge of the first diffusion part through connecting strips which are arranged at intervals so as to form a first channel for sound to pass through; and the inner edge of the second diffusion part is enclosed to form a second channel for sound to pass through. The diffusion cover optimizes the sound diffusion effect, so that the hearing feeling of a high-frequency part is more prominent and clearer.

Description

Technical Field

[0001] The utility model belongs to the field of loudspeakers, and relates to a diffusion cover and a tweeter. Background Art

[0002] Most tweeters are equipped with a panel to protect the front of the diaphragm of the tweeter. For example, a tweeter disclosed in Patent CN218772420U includes a bracket, a magnetic circuit system, a sound film and a voice coil; the tweeter further includes a panel disposed above the sound film, the panel is connected to the bracket, the panel is provided with sound transmission holes, and the main body part of the panel (the part located directly in front of the sound film) is formed by a plurality of radially extending rib strips intersecting each other, and the sound transmission holes are formed by a plurality of rib strips enclosing. Such a panel is not very helpful for the sound diffusion effect, and the panel basically only plays a role in physically protecting the sound film.

[0003] The above information disclosed in the background art section is only used to enhance the understanding of the background of the present application, and thus it may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Utility Model

[0004] In view of this, the utility model provides a diffusion cover and a tweeter, which optimize the sound diffusion effect and make the high-frequency part of the sound more prominent and clear.

[0005] The first aspect of the utility model provides a diffusion cover, which includes an outer fixing member and a diffusion ring for being disposed directly in front of the diaphragm of the loudspeaker, and the diffusion ring is located inside the outer fixing member; the diffusion ring includes a first diffusion part and a second diffusion part; on a first plane perpendicular to the front-rear direction, the front projections of the first diffusion part and the second diffusion part are both continuous and closed rings; in the cross-section of the diffusion 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 integral; the outer fixing member and the outer edge of the first diffusion part are connected by spaced connection strips to form a first channel for sound to pass through; the inner edge of the second diffusion part encloses to form a second channel for sound to pass through.

[0006] In some preferred embodiments, on the first plane, the width of the front projection of the diffusion ring is greater than one-fourth of the inner diameter of the outer fixing member.

[0007] In some preferred embodiments, the first diffusion part is generally a truncated conical shape with a larger front and a smaller rear, and the second diffusion part is generally a truncated conical shape with a smaller front and a larger rear.

[0008] In some preferred embodiments, the thicknesses of the first diffusion part, the second diffusion part, and the connecting strip are uniform and equal.

[0009] In some preferred embodiments, on the first plane, the orthographic projection of the connecting strip extends along the radial direction of the diffusion cover; in the cross-section, the connecting strip is integrally in an upward-arching circular arc shape.

[0010] The second aspect of the present utility model provides a tweeter, including a bracket and a diaphragm. The tweeter further includes the diffusion cover as described above. The outer fixing member is fixedly connected to the bracket, and the diaphragm is located at the rear side of the diffusion cover.

[0011] In some preferred embodiments, the diaphragm includes a surround, a first vibrating part, and a second vibrating part arranged in sequence from outside to inside. The surround is connected to the bracket. 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 the cross-section of the tweeter along the front-rear direction, the first vibrating part gradually inclines backward from outside to inside, and the second vibrating part gradually inclines forward from outside to inside.

[0012] In some more preferred embodiments, in the cross-section, the first vibrating part and the first diffusion part are integrally parallel to each other, and the second vibrating part and the second diffusion part are integrally parallel to each other.

[0013] In some more preferred embodiments, the first vibrating part and the second vibrating part are integral. The voice coil is connected to the inner edge of the first vibrating part and / or the outer edge of the second vibrating part. An annular groove surrounding the magnetic circuit assembly is provided on the bracket, and the notch of the annular groove faces the surround and / or the first vibrating part in the front.

[0014] In some more preferred embodiments, the diaphragm further includes an inner connecting edge. The inner connecting edge is connected to the inner edge of the second vibrating part, and the inner connecting edge is connected to the bracket or the magnetic circuit assembly fixed on the bracket through a limiting post.

[0015] The present utility model adopts the above solutions and has the following advantages:

[0016] The diffusion cover of the present utility model and the tweeter using such a diffusion cover improve the diffusion effect in the high-frequency band, reduce sound distortion, and enhance the sound quality; enhance the clarity and audibility of the high-frequency part.

[0017] In a further preferred solution, there is no need to provide components such as positioning support pieces or flexure waves. The limiting posts play a role in centering and limiting the diaphragm, and at the same time, it can also prevent foreign matters such as water vapor and dust from entering the interior of the speaker, affecting the performance of internal components such as the magnetic circuit assembly and the voice coil; it is more conducive to miniaturizing the high-frequency speaker, making it more convenient and flexible to apply on vehicles and saving installation space. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 FIG. 9 is a perspective view of a high-frequency speaker according to an embodiment of the present invention.

[0020] Figure 2 FIG. 13 is an exploded view of a high-frequency speaker according to an embodiment of the present invention.

[0021] Figure 3 FIG. 17 is a cross-sectional view of a high-frequency speaker according to an embodiment of the present invention along the front-rear direction.

[0022] Figure 4 FIG. 21 is a perspective view of a diffusion cover according to an embodiment of the present invention.

[0023] Figure 5 FIG. 25 is a perspective view of the high-frequency speaker of Comparative Example 1.

[0024] Figure 6 FIG. 29 is a perspective view of the high-frequency speaker of Comparative Example 2.

[0025] Figure 7 FIG. 33 is a frequency response curve diagram of Comparative Example 1, Comparative Example 2 and the embodiment.

[0026] In the above drawings,

[0027] 1. Diffusion cover; 11. Outer fixing member; 12. Diffusion ring; 121. First diffusion part; 122. Second diffusion part; 13. Connecting strip; 14. First channel; 15. Second channel;

[0028] 2. Bracket; 21. Outer cylinder; 22. Annular groove; 23. Inner cylinder;

[0029] 3. Diaphragm; 31. Folded ring; 32. First vibrating part; 33. Second vibrating part; 34. Inner connecting edge;

[0030] 4. Voice coil;

[0031] 5. Magnetic circuit assembly; 50. Magnetic gap; 51. U-shaped iron; 52. Magnet; 53. Front piece; 531. Mounting groove;

[0032] 6. Limit post. Detailed implementation manner

[0033] The following elaborates on the preferred embodiments of the present utility model in conjunction with the accompanying drawings, so that the advantages and features of the present utility model can be more easily understood by those skilled in the art. It should be noted here that the description of these embodiments is for helping to understand the present utility model, but does not constitute a limitation to the present utility model. In addition, the technical features involved in the various embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0034] In this article, "inside" and "outside" are defined with reference to the vibration axis (center line of the voice coil) of the tweeter. The orientation closer to the vibration axis is the inside, and vice versa. The orientation terms "up" and "down" are intended to facilitate the understanding of the structure of the in-vehicle subwoofer by those skilled in the art and are not used to limit the state after the tweeter is installed (for example, installed in a vehicle).

[0035] In addition, in this article, the term "high pitch" refers to sounds in the frequency range above 10000 Hz; a "tweeter" refers to a speaker whose reproduced sound is concentrated in the frequency range above 10000 Hz.

[0036] Figures 1 to 4 The drawings are drawn to actual scale. To maintain the simplicity of the specification, the proportions of each component are not listed one by one, but the proportions and positions of each component should be regarded as part of the content of this specification.

[0037] Embodiment

[0038] This embodiment provides a tweeter and a diffuser cover for the speaker. Referring to Figures 1 to 3 As shown, the tweeter mainly includes a diffuser cover 1, a bracket 2, a diaphragm 3, a voice coil 4 and a magnetic circuit assembly 5. The diffuser cover 1 is fixed on the bracket 2, the diaphragm 3 is fixed inside the bracket 2, one end (front end) of the voice coil 4 is fixed to the middle 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 and realizing electro-acoustic conversion. It should also be noted that: the voice coil 4 drives the diaphragm 3 to vibrate reciprocally along a vibration axis, thereby emitting sound; this vibration axis coincides with the center line of the voice coil 4 (extending in the front-rear direction). The following describes each component of the tweeter in detail.

[0039] Combined with Figure 4As shown in the figure, the diffusion cover 1 includes an outer fixing member 11 and a diffusion ring 12 for being disposed directly in front of the diaphragm 3 of the speaker. Among them, the outer fixing member 11 is generally annular and sleeved outside the bracket 2, and the two are fixed to each other. The diffusion ring 12 is located inside the outer fixing member 11 and is fixed to the diffusion cover 1 through a plurality of connecting strips 13. The diffusion cover 1 can be an integrally formed component, such as a plastic part formed by injection molding. The diffusion ring 12 includes a first diffusion portion 121 and a second diffusion portion 122. On a first plane perpendicular to the front-rear direction, the front projections of the first diffusion portion 121 and the second diffusion portion 122 are both continuous and closed rings. In the cross-section (the plane where the vibration axis is located) of the diffusion cover 1 along the front-rear direction, the first diffusion portion 121 gradually inclines backward from outside to inside, and the second diffusion portion 122 gradually inclines 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 integral. 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 channel 14 for sound to pass through, and its front projection on the first plane is generally fan-shaped. The inner edge of the second diffusion portion 122 encloses to form a second channel 15 for sound to pass through, and its front projection on the first plane is generally circular.

[0040] On the first plane, the width of the front projection of the diffusion ring 12 is greater than one-fourth of the inner diameter of the outer fixing member 11. That is, when observing the high-frequency speaker from the front side, at least half of the effective radiation area of the diaphragm 3 is blocked by the diffusion ring 12. Preferably, on the first plane, the width of the front 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 an overall truncated conical shape with a larger front and a smaller rear, and the second diffusion portion 122 is an overall truncated conical shape with a smaller front and a larger rear. 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.

[0041] On the first plane, the connecting strips 13 are strip-shaped, and the front projection (length direction) of the connecting strips 13 extends along the radial direction of the diffusion cover 1. A plurality of connecting strips 13 are arranged at intervals along the circumferential direction of the diffusion cover 1. In Figure 3 the cross-section shown, the connecting strips 13 are integrally circular arc-shaped with the middle arched upward.

[0042] As Figure 3As shown, the bracket 2 is provided with an annular groove 22 arranged around the magnetic circuit assembly 5. Specifically, the bracket 2 includes an outer cylinder 21 and an inner cylinder 23 disposed within the outer cylinder 21. The rear ends of the outer cylinder 21 and the inner cylinder 23 are connected to form the above-mentioned annular groove 22. The height of the outer cylinder 21 is greater than that 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 above-mentioned outer fixing member 11 is specifically connected to the outer cylinder 21.

[0043] The diaphragm 3 includes a surround 31, a first vibrating portion 32, and a second vibrating portion 33 arranged in sequence from outside to inside. The surround 31 is connected to the outer cylinder 21 of the bracket 2 and / or the outer fixing member 11 of the diffusion cover 1; specifically, the outer edge of the surround 31 is clamped between the outer fixing member 11 of the diffusion cover 1 and the outer cylinder 21 of the bracket 2, thereby suspending the diaphragm 3 on the bracket 2. The first vibrating portion 32 is located at the rear side of the first diffusion portion 121, and the second vibrating portion 33 is located at the rear side of the second diffusion portion 122. In the cross-section of the tweeter along the front-rear direction, the first vibrating portion 32 gradually inclines backward from outside to inside, and the second vibrating portion 33 gradually inclines forward from outside to inside. Further, in the above-mentioned cross-section along the vibration axis (as Figure 3 shown), the first vibrating portion 32 and the first diffusion portion 121 are generally parallel to each other, and the second vibrating portion 33 and the second diffusion portion 122 are generally parallel to each other. That is, the distance between the diffusion ring 12 and the diaphragm 3 is substantially equal everywhere. Here, the "distance" refers to the distance along the vibration axis between the diffusion ring 12 and the first vibrating portion 32 / second vibrating portion 33 of the diaphragm 3.

[0044] The first vibrating portion 32 and the second vibrating portion 33 are integral. The first vibrating portion 32 and the second vibrating portion 33 can be made of components such as pulp, fiber, and polymer materials by an integral molding process. The front end of the voice coil 4 is connected to the inner edge of the first vibrating portion 32 and / or the outer edge of the second vibrating portion 33, for example, by gluing. The notch of the annular groove 22 of the bracket 2 faces the surround 31 and / or the first vibrating portion 32 in front of it.

[0045] The diaphragm 3 further includes an inner connecting edge 34. The inner connecting edge 34 is connected to the inner edge of the second vibrating part 33, and the inner connecting edge 34 is fixed on the magnetic circuit assembly 5 on the bracket 2 through the limiting posts 6. Specifically, in the example shown in the attached drawings, the limiting posts 6 are fixed to the magnetic circuit assembly 5. The magnetic circuit assembly 5 includes a U-shaped iron 51, a magnet 52 and a front piece 53. The magnet 52 and the front piece 53 are arranged inside the U-shaped iron 51, and an annular magnetic gap 50 is formed between them and the annular inner surface of the U-shaped iron 51. The outer surface of the U-shaped iron 51 is fixed in the inner cylinder 23 of the bracket 2, for example, by gluing; the front piece 53 is fixed on the front surface of the magnet 52. An installation groove 531 is provided on the magnetic circuit assembly 5 (specifically, in the middle of the front piece 53), and the bottom of the limiting post 6 is inserted and fixed in the installation groove 531. The top of the limiting post 6 is fixed to the inner edge of the inner connecting edge 34, for example, by gluing. This tweeter is a small speaker that does not include a positioning support piece / coil bobbin. The limiting posts 6 can center and limit the diaphragm 3 to prevent the diaphragm 3 from shaking in a direction other than the expected direction (the vibration axis direction).

[0046] This tweeter is typically a vehicle-mounted tweeter, which is one of the components of an automotive audio system and is responsible for playing high-frequency sounds. Among them, it is fixed to the structural member of the vehicle through the external fixing member 11 or the bracket 2.

[0047] Comparative Example 1

[0048] Comparative Example 1 provides a tweeter, and the only difference from the embodiment lies in the diffuser 1. Specifically, as Figure 5 shown, compared with the embodiment, the diffuser 1 of Comparative Example 1 has the following structural characteristics: (1) In the cross-section along the vibration axis, the diffusion ring 12 is flat, and its lower surface is a plane perpendicular to the vibration axis; (2) In the first plane perpendicular to the vibration axis, the width of the positive projection of the diffusion ring 12 is less than one-fourth of the distance between the fixing members.

[0049] Comparative Example 2

[0050] Comparative Example 2 provides a tweeter, and the only difference from the embodiment lies in the diffuser 1. Specifically, as Figure 6 shown, compared with the embodiment, the diffuser 1 of Comparative Example 2 has the following structural characteristics: (1) In the cross-section along the vibration axis, the diffusion ring 12 is flat, and its lower surface is a plane perpendicular to the vibration axis; (2) In the first plane perpendicular to the vibration axis, the width of the positive projection of the diffusion ring 12 is less than one-fourth of the distance between the fixing members; (3) The diameter of the second channel 15 surrounded by the diffusion ring 12 is smaller than that of the embodiment and Comparative Example 1.

[0051] Sound performance comparison:

[0052] The sound - generating performance of three high - frequency speakers of the same specification (except for the initial diffusion cover 1, the sizes of other components such as the diaphragm 3 and the bracket 2 are equal) in Example, Comparative Example 1, and Comparative Example 2 was evaluated, and their frequency response curves are as shown in Figure 7 shown. Refer to Figure 7 . The high - frequency speaker of Example 1 has a better response in the high - frequency part and can bring a better listening experience for high - pitched sounds.

[0053] The high - frequency speaker using the diffusion cover 1 of the example has the following advantages: optimizing the sound diffusion effect through a special structure, making the listening experience in the high - frequency part more prominent and clear, improving the diffusion effect in the high - frequency band, reducing sound distortion, and enhancing the sound quality; enhancing the clarity and audibility of the high - pitched part. There is no need to set components such as positioning supports / elastic waves. The limiting posts 6 play a role in centering and limiting the diaphragm 3, and at the same time, it can also prevent foreign objects such as water vapor and dust from entering the inside of the speaker, affecting the performance of internal components such as the magnetic circuit assembly 5 and the voice coil 4; it is more conducive to miniaturizing the high - frequency speaker, making its application on vehicles more convenient and flexible, and saving installation space.

[0054] As shown in this specification and the claims, the terms "comprising" and "including" only indicate the inclusion of the clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0055] It can be further understood that in this disclosure, "a plurality of" means two or more, and other quantifiers are similar.

[0056] It can be further understood that the terms "first", "second", etc. are used to describe various information, but this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other, and do not represent a specific order or importance. In fact, the expressions "first", "second", etc. can be used interchangeably. For example, without departing from the scope of this disclosure, the first information can also be called the second information, and similarly, the second information can also be called the first information.

[0057] The above - mentioned embodiments are only for illustrating the technical concept and characteristics of the present utility model. They are a preferred embodiment, and their purpose is to enable those who are familiar with this technology to understand the content of the present utility model and implement it accordingly. It cannot be used to limit the protection scope of the present utility model.

Claims

1. A diffusion cover, characterized in that: It includes an external fixing part and a diffusion ring for being arranged in front of the diaphragm of the speaker, and the diffusion ring is located inside the external fixing part; the diffusion ring includes a first diffusion part and a second diffusion part; on a first plane perpendicular to the front-to-back direction, the orthographic projections of the first diffusion part and the second diffusion part are both continuous and closed rings; on the cross section of the diffusion cover along the front-to-back direction, the first diffusion part gradually tilts backward from the outside to the inside, and the second diffusion part gradually tilts forward from the outside to the 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 external fixing part and the outer edge of the first diffusion part are connected by spaced connecting strips to form a first channel for sound to pass through; the inner edge of the second diffusion part encloses to form a second channel for sound to pass through.

2. The diffusion cover according to claim 1, characterized in that: On the first plane, a width of an orthographic projection of the diffusion ring is greater than a quarter of an inner diameter of the external fixing member.

3. The diffusion cover according to claim 1, characterized in that: The first diffuser is in the shape of a truncated cone with a larger front and a smaller rear portion, and the second diffuser is in the shape of a truncated cone with a smaller front and a larger rear portion.

4. The diffusion cover according to claim 1, characterized in that: The first diffusion portion, the second diffusion portion, and the connecting strip have uniform and equal thicknesses.

5. The diffusion cover according to claim 1, characterized in that: On the first plane, the orthographic projection of the connecting strip extends along the radial direction of the diffusion cover; in the cross section, the connecting strip is in the shape of an upwardly arched arc as a whole.

6. A tweeter loudspeaker, comprising a bracket and a diaphragm, characterized in that: The tweeter speaker further comprises a diffusion cover as claimed in any one of claims 1 to 5, the external fixing member is fixedly connected to the bracket, and the diaphragm is located at the rear side of the diffusion cover.

7. The tweeter according to claim 6, characterized in that: The diaphragm includes a folded ring, a first vibrating part, and a second vibrating part, which are arranged in sequence from the outside to the inside, the folded ring is connected to the bracket, the first vibrating part is located on the rear side of the first diffusion part, and the second vibrating part is located on the rear side of the second diffusion part; in the cross section of the tweeter along the front-to-back direction, the first vibrating part gradually tilts backward from the outside to the inside, and the second vibrating part gradually tilts forward from the outside to the inside.

8. The tweeter according to claim 7, characterized in that: In the cross section, the first vibrating portion and the first diffusing portion are entirely parallel to each other, and the second vibrating portion and the second diffusing portion are entirely parallel to each other.

9. The tweeter speaker according to claim 7, characterized in that: 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 bracket is provided with an annular groove arranged around the magnetic circuit component, and the notch of the annular groove faces the folding ring and / or the first vibration part in front.

10. The tweeter speaker according to claim 7, characterized in that: The diaphragm further comprises an inner connecting edge, wherein the inner connecting edge is connected to the inner edge of the second vibrating portion, and the inner connecting edge is connected to the bracket or a magnetic circuit component fixed on the bracket through a limiting column.

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