Dust cap and loudspeaker

Abstract

The utility model discloses a dustproof cap and loudspeaker. The dustproof cap of loudspeaker includes the main part of the middle portion along the center line of dustproof cap and protrudes forward, the main part includes first part and second part, first part and second part along the direction of around center line in proper order are laid out, in the cross section of main part along center line, the curvature of first part or second part is zero and the whole is conical one part, the curvature of first part is greater than the curvature of second part, thereby second part is concave to first part backward. The dustproof cap of the utility model solves the problem that the frequency response curve of loudspeaker drops in the middle frequency band, is favorable to make loudspeaker maintain stable performance, and the middle frequency sound is real and natural.

Description

Technical Field

[0001] This utility model relates to a dust cap and a loudspeaker. Background Technology

[0002] As an electroacoustic transducer, a loudspeaker converts electrical signals into sound signals through electromagnetic, piezoelectric, or electrostatic effects. Its core vibrating components include the voice coil, centering support, cone, and dust cap. The dust cap, as a critical component, functions to prevent external impurities from entering the loudspeaker and also participates in acoustic resonance. Traditional hemispherical dust caps have a certain impact on midrange loudspeakers, primarily manifested in a downward trend in the midrange frequency response curve.

[0003] The information disclosed in the background section is only intended to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0004] This invention provides an improved dust cap for a loudspeaker, solving the problem of a drop in the frequency response curve of the loudspeaker in the mid-frequency range, thus helping to maintain stable loudspeaker performance and producing a realistic and natural mid-frequency sound. This invention also provides a loudspeaker with the aforementioned dust cap, preventing a drop in the frequency response curve in the mid-frequency range.

[0005] A dust cap for a loudspeaker includes a main body that protrudes forward along the centerline of the dust cap. The main body includes a first part and a second part, which are arranged sequentially along a direction surrounding the centerline. In a cross-section of the main body along the centerline, the curvature of the first part or the second part is zero and it is a conical part in whole. The curvature of the first part is greater than the curvature of the second part, so that the second part is recessed rearward relative to the first part.

[0006] In some preferred embodiments, the main body includes a plurality of first portions spaced apart around the center line; in a cross section of the main body along the center line, the curvature of the first portions is zero, and the curvature of the second portions is negative; the plurality of first portions together form a conical structure with a cone angle of 60 to 150°, and the second portions are curved surfaces located on the rear side of the conical structure.

[0007] In some preferred embodiments, the main body includes a plurality of second portions spaced apart around the center line; in a cross section of the main body along the center line, the curvature of the second portions is zero; the edges of the plurality of second portions together form a conical structure with a cone angle of 60 to 150°, and the curvature of the first portions is positive.

[0008] In some preferred embodiments, the main body includes a plurality of first portions and a plurality of second portions, the plurality of first portions being spaced apart around the center line, the plurality of second portions being spaced apart around the center line, the plurality of first portions and the plurality of second portions being staggered, and adjacent first portions and second portions being connected.

[0009] In some preferred embodiments, the body further includes a central portion and an outer edge, the front ends of a plurality of first portions converge and are connected to the central portion, the rear ends of a plurality of first portions are each connected to the outer edge, and the first portions are surrounded between two adjacent first portions, the central portion and the outer edge.

[0010] In some preferred embodiments, a second portion is directly connected between two adjacent first portions; the center lines of the plurality of first portions are centrally symmetrical, and the plurality of second portions are centrally symmetrical about the center lines.

[0011] In some preferred embodiments, in the orthographic projection of the dust cap onto a plane perpendicular to the center line, the first part is generally elongated, and the length direction of the first part deviates from the diameter direction of the main body.

[0012] In some preferred embodiments, the dust cap further includes a yoke that extends outward from the rear side of the body and is perpendicular to or inclined relative to the centerline.

[0013] In some preferred embodiments, the dust cap or the main body is a one-piece thin-walled shell-type part, and the thickness of the first part and the thickness of the second part are the same.

[0014] In some preferred embodiments, the ratio of the height of the body along the centerline to its maximum dimension in the direction perpendicular to the centerline is greater than 1:2. In other preferred embodiments, the ratio of the height of the body along the centerline to its maximum dimension in the direction perpendicular to the centerline is 1:2 to 1.5:1; more preferably 1.1:2 to 1:1.

[0015] A second aspect of this invention provides a loudspeaker comprising a dust cap for the loudspeaker, the dust cap being disposed on the front side of the diaphragm.

[0016] In some preferred embodiments, the diaphragm includes a cone with a hole at its tip, and the yoke of the dust cap is connected to the front surface of the cone, wherein the yoke is a truncated cone that cooperates with the cone.

[0017] In a preferred embodiment, the dust cap is entirely surrounded within the diaphragm. That is, the height of the dust cap does not exceed the height of the diaphragm.

[0018] In this article, the term "curvature" refers to the degree of bending of a component. "Zero curvature" means that the component does not bend in at least one direction; "positive curvature" means that the component bends outward; and "negative curvature" means that the component bends inward.

[0019] The present invention adopts the above solution and has the following advantages compared with the prior art: The dust cap of the speaker of this utility model includes a first part or a second part with zero curvature, so that the dust cap has an overall conical part, and the second part is concave to the rear relative to the first part. This composite structure of the dust cap can solve the problem of the drop in the mid-frequency band of the speaker's frequency response curve in the mid-frequency stage, and can obtain a smoother speaker frequency response curve, more stable speaker performance, more realistic and natural mid-range sound, and improved sound quality. Attached Figure Description

[0020] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a perspective view of a loudspeaker according to an embodiment of the present invention.

[0022] Figure 2 This is an assembly diagram of a diaphragm and a dust cap according to an embodiment of the present utility model.

[0023] Figure 3 This is a perspective view of a dust cap according to an embodiment of the present utility model.

[0024] Figure 4 This is a view along the center line of a dust cap according to an embodiment of the present invention.

[0025] Figure 5 for Figure 4 Sectional view along the AA direction.

[0026] Figure 6 This is a three-dimensional diagram of a speaker.

[0027] Figure 7 This is a front view of a dust cap for comparison.

[0028] Figure 8 This is a top view of a scaled-up dust cap.

[0029] Figure 9 The speaker frequency response curves are shown for the embodiments and comparative examples.

[0030] In the above attached figures, 100. Speaker; 1. Dust cap; 11. Main body; 111. First part; 112. Second part; 113. Central part; 114. Outer edge; 12. Yoke ring; 2. Diaphragm; 21. Cone; 211. Load-bearing part; 22. Surrounding component; 3. Framework. Detailed Implementation

[0031] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art. It should be noted that the description of these embodiments is for the purpose of aiding understanding the present invention, but does not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0032] In this article, "inner" and "outer" are defined with reference to the loudspeaker, with the position closer to the loudspeaker being considered inner and vice versa. The directional terms "upper," "lower," and "horizontal" are intended to help those skilled in the art understand the structure of the vehicle-mounted sound device and are not used to limit the state of the vehicle-mounted sound device after it is installed in the usage scenario. For example, the vehicle-mounted sound device can be installed on a horizontal, inclined, or vertical surface of a vehicle.

[0033] Example Figures 1 to 5 An embodiment of a loudspeaker 100 and an embodiment of a dust cap 1 for the loudspeaker 100 are shown. The loudspeaker 100 is typically a vehicle loudspeaker, such as a pedestrian warning device, a vehicle mid-bass loudspeaker, etc.

[0034] Reference Figure 1The loudspeaker 100 includes a dust cap 1, a diaphragm 2, and a frame 3. The dust cap 1 is disposed on the diaphragm 2, and the diaphragm 2 is suspended on the frame 3. For a moving-coil loudspeaker 100, it also includes a voice coil and a magnetic circuit system for providing drive. The frame 3 can be mounted to the body of a vehicle, and the frame 3 may have multiple screw holes for mounting. The outer overhang of the diaphragm 2 is fixed to the upper end face of the frame 3, so that the diaphragm 2 is suspended on the frame 3. The voice coil and magnetic circuit are disposed within the frame 3. The magnetic circuit is fixed to the frame 3 to provide a magnetic field. The upper end of the voice coil is fixed to the cone of the diaphragm 2, and the coil portion of the voice coil is inserted into the magnetic gap of the magnetic circuit. When an electrical signal is received by the voice coil, under the action of the magnetic field of the magnetic circuit, the voice coil will drive the diaphragm 2 to vibrate up and down along the vibration axis of the loudspeaker (i.e., the center line C of the dust cap 1), realizing electroacoustic conversion.

[0035] Reference Figure 2 As shown, the diaphragm 2 includes a cone 21 and a surround member that surrounds the cone 21. The diaphragm 2 is configured to be suspended from the frame 3 of the loudspeaker 100 by the surround member. In the example shown in the figure, the cone 21 is a truncated cone shape, with a hole for connecting the voice coil in the middle (tip) of the cone 21, which is covered by a dust cap 1, and the surround member is an annular structure surrounding the cone 21.

[0036] The cone 21 has an upwardly protruding or downwardly recessed load portion 211. When viewed along the center line C, the load portion 211 is a centrally symmetrical figure, specifically with the center point (center of the circle) of the cone 21 as the center of symmetry. The cone 21 can be formed by pressing a single sheet of material (pulp sheet, fabric, etc.) of uniform thickness.

[0037] The surround element 22 includes a reinforcing ring that can undulate along the vibration axis of the speaker 100 (i.e., the center line C of the dust cap 1). The reinforcing ring has multiple peaks and multiple valleys, with the peaks and valleys equally spaced along the circumference of the surround element 22. The peaks and valleys are staggered. These peaks and valleys form an alternating undulating structure, with the peaks and valleys located on the upper and lower sides of the horizontal outer edge of the surround element 22 (the part suspended on the frame 3), respectively. The peaks arch upward along the center line C, and the valleys are recessed downward along the center line C, giving the reinforcing ring an overall square wave-like structure. A connecting wall is provided between adjacent peaks and valleys. Viewed along the center line CC, the connecting wall extends outward from the outer edge of the cone 21, and the direction of extension of the connecting wall deviates from the center point of the cone 21.

[0038] Reference Figures 3 to 5As shown, the dust cap 1 of the speaker 100 includes a main body 11, the middle portion of which protrudes forward along the center line C of the dust cap 1. The main body 11 includes a first part 111 and a second part 112, which are arranged sequentially along the direction surrounding the center line C, as shown. Figure 4 As shown; that is, neither the first part 111 nor the second part 112 is a ring structure that surrounds the center line C. Figure 5 As shown, in the cross section along the center line C of the main body 11, the curvature of the first part 111 or the second part 112 is zero and the whole part is conical. The curvature of the first part 111 is greater than the curvature of the second part 112, so the second part 112 is concave relative to the first part 111.

[0039] like Figure 4 As shown, the main body 11 includes a plurality of first parts 111 and a plurality of second parts 112. The plurality of first parts 111 are arranged at intervals around the center line C, and the plurality of second parts 112 are arranged at intervals around the center line C. The plurality of first parts 111 and the plurality of second parts 112 are arranged alternately, and adjacent first parts 111 and second parts 112 are connected.

[0040] like Figure 5 As shown, in this embodiment, in the cross-section along the center line C of the main body 11, the curvature of the first part 111 is zero, and the curvature of the second part 112 is negative. In other words, in the above cross-section, neither the front nor rear surface of the first part 111 has an oblique line inclined relative to the center line C; the front and rear surfaces of the second part 112 are both arcs / curves that curve backward / inward relative to the first part 111. The multiple first parts 111 collectively form a conical structure with a cone angle of 60~150°, and the second part 112 is a curved surface located on the rear side of the conical structure. That is, the first part 111 is a part of the conical surface, and the second part 112 is a curved surface that bulges backward in the middle. From a top-view perspective, a groove structure is formed at the second part 112. Figure 5 In the middle, the cone angle of the cone structure formed by multiple first parts 111 is 90°.

[0041] In some other embodiments, in the cross-section along the center line C of the main body 11, the curvature of the second portion 112 can be zero, and the edges of multiple second portions 112 together form a conical structure with a cone angle of 60~150°, while the curvature of the first portion 111 is positive. That is, the second portion is part of a conical surface, the first portion 111 is a curved surface that bulges forward in the middle, and a protruding structure is formed at the first portion 111.

[0042] The main body 11 also includes a central portion 113 and an outer edge 114. The front ends of a plurality of first portions 111 converge and connect to the central portion 113, and the rear ends of the plurality of first portions 111 are each connected to the outer edge 114. The first portions 111 are surrounded between two adjacent first portions 111, the central portion 113, and the outer edge 114. The central portion 113 is spherical, and the outer edge 114 is truncated conical.

[0043] A second part 112 is directly connected between any two adjacent first parts 111. The center line C of the multiple first parts 111 is centrally symmetrical, and the multiple second parts 112 are centrally symmetrical about the center line C.

[0044] like Figure 4 As shown, in the orthographic projection of the dust cap 1 onto a plane perpendicular to the center line C, the first part 111 is generally elongated (rib-shaped), and the length direction of the first part 111 deviates from the diameter direction of the main body 11. That is, the length direction of the first part 111 does not intersect with the center line C of the dust cap 1, and the two are spatially offset from each other. The second part 112 is generally fan-shaped. The first part 111 adopts a rib structure with a gradually widening design, which is distributed radially from the center outward; multiple second parts 112 form a fan-shaped petal pattern.

[0045] The dust cap 1 also includes a yoke 12, which extends outward from the rear side of the main body 11. The yoke 12 is perpendicular to the center line C or inclined relative to the center line C. In this embodiment, the yoke 12 of the dust cap 1 is connected to the front surface of the cone 21, and the yoke 12 is a truncated cone shape that cooperates with the cone 21. The dust cap 1 is disposed on the front side of the diaphragm 2 and does not extend beyond the front side of the diaphragm 2.

[0046] The dust cap 1 or the main body 11 is a one-piece, thin-walled shell-like part, for example, integrally molded from fabric, resin, or rubber. For example, the dust cap 1 is formed from paper pulp and then coated with a coating for waterproofing and hardening. In some other embodiments, the material of the dust cap 1 may also be a fibrous fabric coated with a resin coating (such as a heat-fixing resin).

[0047] The thickness of the first part 111 is the same as the thickness of the second part 112. In some other embodiments, the dust cap 1 has a uniform overall thickness.

[0048] The ratio of the height of the main body 11 along the center line C to its maximum dimension in the direction perpendicular to the center line C is greater than 1:2. The ratio of the height of the main body 11 along the center line C to its maximum dimension in the direction perpendicular to the center line C can be 1:2 to 1.5:1; more preferably 1.1:2 to 1:1. This is significantly higher than the height-to-width ratio of a conventional hemispherical dust cap 1, as described in the comparative examples below.

[0049] The dust cap 1 is completely enclosed within the diaphragm 2. That is, the height of the dust cap 1 will not exceed the height of the diaphragm 2.

[0050] Comparative Example Reference Figures 6 to 8 The only difference between the comparative speaker 100' and the embodiment is the shape of the dust cap 1'. In the comparative example, the dust cap 1' is hemispherical.

[0051] Performance testing: Simulation tests were conducted on the two loudspeakers 100 in the embodiment and the comparative example under the same test conditions, using the same excitation signal. The results are as follows: Figure 9 As shown, the frequency response curve of the speaker 100 with the conical dust cap 1 in the embodiment is significantly better than that of the ordinary hemispherical dust cap 1 in the mid-frequency range of 5kHz to 6kHz, and is smoother; the frequency response curve of the speaker 100 with the ordinary hemispherical dust cap 1 in the comparative example shows a significant downward trend in the 5kHz to 6kHz range.

[0052] The embodiment can avoid the downward trend and performance instability of the frequency response curve of the hemispherical dust cap 1 speaker 100 in the mid-frequency range, thus improving the sound quality of the speaker 100, especially with better mid-frequency sound.

[0053] As indicated in this specification and claims, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, and these steps and elements do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0054] It can be further understood that in this disclosure, "multiple" refers to two or more, and other quantifiers are similar.

[0055] It is further understood that the terms "first," "second," etc., are used to describe various types of information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another, and do not indicate a specific order or degree of importance. In fact, the expressions "first," "second," etc., are completely interchangeable. For example, without departing from the scope of this disclosure, first information can also be referred to as second information, and similarly, second information can also be referred to as first information.

[0056] The above embodiments are only for illustrating the technical concept and features of this utility model, and are preferred embodiments. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly, and they cannot be used to limit the protection scope of this utility model.

Claims

1. A dust cap for a loudspeaker, comprising a main body protruding forward along the centerline of the dust cap, characterized in that, The main body includes a first part and a second part, which are arranged sequentially along the direction surrounding the center line; in the cross section of the main body along the center line, the curvature of the first part or the second part is zero and the whole part is a conical part, the curvature of the first part is greater than the curvature of the second part, so that the second part is concave relative to the first part.

2. The dust cap for the loudspeaker according to claim 1, characterized in that, The main body includes a plurality of first parts spaced apart around the center line; in the cross section of the main body along the center line, the curvature of the first parts is zero, and the curvature of the second parts is negative; the plurality of first parts together form a conical structure with a cone angle of 60~150°, and the second part is a curved surface located on the rear side of the conical structure.

3. The dust cap for the loudspeaker according to claim 1, characterized in that, The main body includes a plurality of second parts spaced apart around the center line; in the cross section of the main body along the center line, the curvature of the second parts is zero; the edges of the plurality of second parts together form a conical structure with a cone angle of 60 to 150°, and the curvature of the first part is positive.

4. The dust cap for the loudspeaker according to claim 1, characterized in that, The main body includes a plurality of first parts and a plurality of second parts, the plurality of first parts being spaced apart around the center line, the plurality of second parts being spaced apart around the center line, the plurality of first parts and the plurality of second parts being staggered, and adjacent first parts and second parts being connected.

5. The dust cap for the loudspeaker according to claim 4, characterized in that, The main body also includes a central portion and an outer edge, the front ends of a plurality of first portions converge and are connected to the central portion, the rear ends of a plurality of first portions are each connected to the outer edge, and the first portions are surrounded between two adjacent first portions, the central portion and the outer edge.

6. The dust cap for the loudspeaker according to claim 4, characterized in that, A second part is directly connected between any two adjacent first parts; the center lines of the multiple first parts are centrally symmetrical, and the multiple second parts are centrally symmetrical about the center lines.

7. The dust cap for a loudspeaker according to any one of claims 1 to 6, characterized in that, In the orthographic projection of the dust cap onto a plane perpendicular to the center line, the first part is elongated, and the length direction of the first part deviates from the diameter direction of the main body.

8. The dust cap for a loudspeaker according to any one of claims 1 to 6, characterized in that, The dust cap also includes a yoke ring, which extends outward from the rear side of the main body and is perpendicular to the center line or inclined relative to the center line. The dust cap or the main body is a one-piece thin-walled shell-type part, and the thickness of the first part and the thickness of the second part are the same. The ratio of the height of the main body along the centerline to its maximum dimension in the direction perpendicular to the centerline is greater than 1:2 or is 1:2 to 1.5:

1.

9. A loudspeaker, characterized in that, The speaker includes a dust cap as described in any one of claims 1 to 8, the dust cap being disposed on the front side of the diaphragm.

10. The loudspeaker according to claim 9, characterized in that, The diaphragm includes a cone with a hole at its tip, and the yoke of the dust cap is connected to the front surface of the cone. The yoke is a truncated cone that cooperates with the cone. The dust cap is entirely surrounded within the diaphragm.

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