RIBBON STRUCTURE OF A LOUDSPEAKER

Abstract

Surround structure (1) for use in a loudspeaker, comprising the following: an inner margin (10); an outer edge (20); and a wave-shaped elastic projection (30) positioned between the inner edge (10) and the outer edge (20), wherein the wave-shaped elastic projection (30) is integrally formed from numerous arc-shaped regions (31); wherein each arc-shaped region (31) has: a first end (311), a second end (312) and a middle region (313) between the first end (311) and the second end (312), and a radial section of each arc-shaped region (31) is arc-shaped and has two arc-shaped segments (315, 316) as well as an upper edge (314) located between the two arc-shaped segments (315, 316); wherein the curvature of a radial section of each arc-shaped segment (315, 316) gradually decreases from the first end (311) to the middle region (313), the curvature of a radial section of each arc-shaped segment (315, 316) gradually increases from the middle region (313) to the second end (312), and the shape of a radial section of the first end (311) is the same as the shape of a radial section of the second end (312), wherein the upper edges (314) of the arc-shaped regions (31) are at the same height and are concyclic.

Description

BACKGROUND Technical area

[0001] This application relates to a surround structure and, in particular, to a surround structure of a loudspeaker. State of the art

[0002] A surround is one of the important components of a loudspeaker, typically made of an elastic material and exhibiting elasticity and resistance properties. In addition to providing optimal output power and audio characteristics for the loudspeaker, the surround is a fundamental element of quality control during manufacturing and can effectively extend the loudspeaker's lifespan.

[0003] A cross-section of an existing surround body along one direction of the surround typically has a uniform shape. While a loudspeaker with such a surround is vibrating, the vibrations at different positions on the diaphragm and at different frequencies can be irregular, instead of theoretically being symmetrical and uniform. Consequently, the balance and symmetry of the loudspeaker's operating curve are affected. This leads to relatively high distortion.

[0004] Document US 2002 / 0170773A1 refers to an improved design of suspension elements for loudspeaker transducers, such as surrounds and spiders, which aims to reduce radial and tangential loads during operation. The design incorporates geometric variations such as peaks, parabolic shapes, or sinusoidal wave patterns into the cross-sectional profile of the suspension elements.

[0005] Document JP H11 - 205 895 A concerns a loudspeaker with a diaphragm that has a polygonal contour which gradually transitions to a circular shape towards the center where it is connected to the voice coil in order to disperse resonances and achieve a flatter frequency response. SUMMARY

[0006] In view of the aforementioned problems, the present disclosure specifies a surround structure of a loudspeaker comprising: an inner rim; an outer rim; and a wave-shaped elastic projection positioned between the inner rim and the outer rim, the wave-shaped elastic projection being integrally formed from numerous arcuate regions. Each arcuate region comprises: a first end, a second end, and a middle region between the first end and the second end.A radial section of each arc-shaped region is arc-shaped and has a top edge as well as two arc-shaped segments connected to two sides of the top edge, the curvature of a radial section of each arc-shaped segment gradually decreasing from the first end to the middle region, the curvature of a radial section of each arc-shaped segment gradually increasing from the middle region to the second end, and the shape of a radial section of the first end is the same as the shape of a radial section of the second end. The top edges of the arc-shaped regions are at the same height and are concyclic.

[0007] In one embodiment, each arc-shaped region has an inner arc edge and an outer arc edge; the inner arc edges of the arc-shaped regions are at the same height and are concyclic, and the outer arc edges of the arc-shaped regions are at the same height and are concyclic.

[0008] In one embodiment, each arc-shaped region is arranged symmetrically by using the central region as the center.

[0009] In one embodiment, the radial cut of the first end and the radial cut of the second end are semicircular.

[0010] In one embodiment, the wave-shaped elastic projection is arranged symmetrically with respect to a reference plane, and the reference plane is coplanar to the first end or the second end of an arc-shaped region.

[0011] In one embodiment, the wave-shaped elastic projection has an odd number of arc-shaped regions, and the reference plane is furthermore coplanar to the central region of another arc-shaped region.

[0012] In one embodiment, each arc-shaped segment has a first point at the first end and a second point at the second end, wherein the first point and the second point are at the same height, and a connecting line from the first point to the second point along a surface of the arc-shaped segment is a smooth curve.

[0013] In one embodiment, the radial section of the first end of each arc-shaped region has a first vertex and two first lower endpoints. A reference line is defined between the two first lower endpoints, with a reference circle defined according to the first vertex and a midpoint of the reference line. Connecting lines between the first vertex and the first lower endpoints pass through the reference circle to form points of intersection, and the curvature of each arc-shaped segment in the central region is defined according to an arc formed between the point of intersection and the first vertex.

[0014] In one embodiment, each arc-shaped region has numerous first sampling points at positions of different heights at the first end and numerous second sampling points at the second end, each corresponding to the numerous first sampling points; the curvature of the radial section of each arc-shaped segment from the first end to the middle region and the curvature of the radial section from the middle region to the second end are defined according to corresponding connecting lines between the numerous first sampling points and the numerous second sampling points.

[0015] Based on the above, in the surround structure of a loudspeaker according to this application, the curvature of the radial section of each arc-shaped segment gradually decreases from the first end to the central region, and the curvature of the radial section of each arc-shaped segment gradually increases from the central region to the second end, so that the surface of each arc-shaped region of the wave-like elastic projection exhibits variations in curvature instead of a uniform shape. In this way, the overall stiffness of the surround structure can be modified, and the surround structure exhibits a more linear operating curve as well as better symmetry and balance between negative and positive movement. This effectively reduces sound distortion. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 is a schematic three-dimensional view of an embodiment of a beaded structure according to this application; Fig. Figure 2 is a top view of an embodiment of a beaded structure according to this application; Fig. Figure 3 is a partial top view of an embodiment of a beaded structure according to this application; Fig. Figure 4 is a schematic representation of a radial section along a section line 4-4 according to Fig. 2; Fig. Figure 5 is a schematic representation of a radial section along a section line 5-5 according to Fig. 2; Fig. Figure 6 is a diagram of a stiffness-displacement curve of an embodiment of a corrugated structure according to this application; Fig. Figure 7 is a schematic representation using an interpolation method applied to a beaded structure according to an embodiment of this application; Fig. Figure 8 is a schematic representation using a spline method applied to a beaded structure according to an embodiment of this application; Fig. Figure 9 is the measurement protocol for the “power vs. distortion comparison” according to an embodiment of this application; Fig. Figure 10 is the measurement protocol for the “frequency vs. SPL comparison” according to an embodiment of this application; and Fig. Figure 11 is the measurement protocol of the “maximum and minimum value of the waveform” according to an embodiment of this application. DETAILED DESCRIPTION

[0016] Referring to Fig. 1 and Fig. Document 2 of this application discloses a surround structure 1 for a loudspeaker. In this embodiment, the surround structure 1 has a closed ring shape and comprises an inner rim 10, an outer rim 20, and a corrugated elastic projection 30. The corrugated elastic projection 30 is positioned between the inner rim 10 and the outer rim 20. The surround structure 1 can be made entirely of an elastic material and exhibits elasticity and resistance properties. For example, the surround structure 1 can be made of a rubber material, an elastic fabric, or a foam. Furthermore, the surround structure 1 can be configured to surround a loudspeaker cone (not shown). For example, it can be fixed using the inner rim 10 and the outer rim 20 to surround the loudspeaker cone, thus providing preferred audio characteristics for the loudspeaker.

[0017] Referring to Fig. 2 and Fig. 3 is a wave-shaped elastic projection 30 integrally formed by numerous surrounding arc-shaped areas 31. Fig. Figure 3 is an enlarged view of one of the arcuate regions 31. In this embodiment, the wave-shaped elastic projection 30 is formed from nine common surrounding arcuate regions 31. The number of arcuate regions 31 of the wave-shaped elastic projection 30 can be determined according to the requirements of a loudspeaker (for example, frequency response width, volume, or output power). For example, a larger loudspeaker cone indicates that a surround structure 1 with a larger diameter is needed, so that a greater number of arcuate regions 31 are present (for example, the wave-shaped elastic projection 30 is instead formed from 11, 13, or 15 arcuate regions 31 in a surrounding manner). In some embodiments, the wave-shaped elastic projection 30 can be formed from an even number of arcuate regions 31 (such as 8, 10, or 12).According to this embodiment, the number is not limited.

[0018] In the embodiment according to Fig. 3 Each arc-shaped region 31 has the following: a first end 311, a second end 312, and a middle region 313 between the first end 311 and the second end 312 (the positions of the first end 311, the second end 312, and the middle region 313 are represented by the use of dashed-dotted lines instead of lines that would actually be present in the arc-shaped region 31). Furthermore, a radial section of each arc-shaped region 31 is arc-shaped (as in Fig. 4 and Fig. (shown in Figure 5) and has an upper edge 314 and two arc-shaped segments 315 and 316, which are connected to two sides of the upper edge 314. In other words: Fig. 4 and Fig. Using figure 5 as an example, the radial section of each arc-shaped region 31 curves upwards and is arc-shaped. Furthermore, the curvature of a radial section of each of the arc-shaped segments 315 and 316 gradually decreases from the first end 311 to the middle region 313, and the curvature of a radial section of each of the arc-shaped segments 315 and 316 gradually increases from the middle region 313 to the second end 312.

[0019] Fig. Figure 4 is a schematic representation of a radial section along a section line 4-4 according to Fig. 2, which is a radial section of the first end 311 of each arc-shaped region 31. Fig. Figure 5 is a schematic representation of a radial section along a section line 5-5 according to Fig. 2, which is a radial section of the central region 313 of each arcuate region 31. From Fig. 4 and Fig. Figure 5 shows that the curvature of a radial section of each of the arc-shaped segments 315 and 316 at the first end 311 is greater than the curvature of a radial section of each of the arc-shaped segments 315 and 316 at the middle region 313. Furthermore, the shape of the radial section at the first end 311 of the arc-shaped region 31 is the same as at the second end 312. In the embodiment according to Fig. For example, the radial sections of the first end 311 and the second end 312 can be semicircular. The drawing for the radial section of the second end 312 is omitted. The curvature of the radial section of each of the arc-shaped segments 315 and 316 therefore decreases gradually from the first end 311 to the middle region 313, and the curvature of the radial section of each of the arc-shaped segments 315 and 316 increases gradually from the middle region 313 to the second end 312. A surface of the arc-shaped region 31 can be narrower in the middle and wider at both ends. That is, the surface of each arc-shaped region 31 exhibits variations in curvature instead of having a uniform shape, so that the overall stiffness of the corrugated structure 1 can be modified.

[0020] On Fig. With reference to Figure 5, the radial section of each of the arc-shaped segments 315 and 316 at the first end 311 is further represented by a dashed line D. Since the curvature of each of the arc-shaped segments 315 and 316 in the middle region 313 is smaller than the curvature at the first end 311, a region A is formed between the radial section of each of the arc-shaped segments 315 and 316 at the middle region 313 and the dashed line D. The radial section of each of the arc-shaped segments 315 and 316 from the first end 311 to the middle region 313 and the radial section from the middle region 313 to the second end 312 are located in region A.

[0021] Furthermore, it takes on Fig. Referring to paragraph 3, the curvature of the radial section of each of the arc-shaped segments 315 and 316 decreases gradually from the first end 311 to the central region 313. The curvature of the radial section of each of the arc-shaped segments 315 and 316 increases gradually from the central region 313 to the second end 312. Consequently, a connecting line from a first point 3115 at the first end 311 to a second point 3125 at the same height at the second end 312 along the surface of each of the arc-shaped segments 315 and 316 is a smooth curve. In the embodiment according to Fig. For example, two first points 3115 are defined at the first ends 311 of the arc-shaped segments 315 and 316, and two second points 3125 are defined at the second ends 312 of the arc-shaped segments 315 and 316. Each of the two first points 3115 is connected to the two corresponding second points 3125 to form two smooth curves C1 and C2. Furthermore, the middle segments of the smooth curves C1 and C2, compared with segments at either end, are closer to the upper edge 314 of each arc-shaped region 31, thus indicating a shape that is narrower in the middle and wider at the two ends. Furthermore, on Fig. 1 and Fig. 2 referring to the smooth curves C1 of the arc-shaped regions 31 connected to form a wave-shaped curve; and the smooth curves C2 of the arc-shaped regions 31 connected to form a wave-shaped curve (in Fig. 1 and Fig. 2 shown as wavy dash-dot lines). It should be noted that the wavy dash-dot lines are used to indicate the curvature of the surface of each arc-shaped region 31, and are not lines that are actually present in the arc-shaped region 31.

[0022] On Fig. 6 referring to Fig. Figure 6 shows a diagram of a stiffness-displacement curve generated by conducting an experiment on the surround structure 1 according to the foregoing embodiments. In this drawing, curve L1 represents a stiffness-displacement curve of a conventional surround that has a uniform cross-section during operation. Curve L2 represents a stiffness-displacement curve of the surround structure 1 according to this application during operation. It is evident that curve L2 of the surround structure 1 according to this application is more linear than curve L1 and exhibits better symmetry and balance between negative and positive movements. Therefore, the surround structure 1 according to this application can reduce sound distortion more effectively.

[0023] Since the shape of the radial section of the first end 311 of the arc-shaped region 31 is the same as the radial section of the second end 312, furthermore, referring back to Fig. 2, a first end 311 of one of the two adjacent arc-shaped areas 31 seamlessly connected to a second end 312 of the other of the adjacent arc-shaped areas 31, so that the entire bead structure 1 is smoother and can specify a better operating curve.

[0024] Referring to Fig. 2 and Fig. Furthermore, the upper edges 314 of the arc-shaped regions 31 can be at the same height and are concyclic. Each arc-shaped region 31 has an inner arc edge 317 and an outer arc edge 18. The inner arc edges 317 of the arc-shaped regions 31 are at the same height and are concyclic. The outer arc edges 318 of the arc-shaped regions are also at the same height and are concyclic. Fig. Referring to section 4, the radial section of the first end 311 of each arc-shaped region 31 further has a first vertex 3111 and two first lower endpoints 3112. The shape of the radial section of the second end 312 is the same as that of the radial section of the first end 311 of each arc-shaped region 31. Details are not described here. Fig. Referring to section 5, the radial section of the central region 313 of each arc-shaped region 31 further exhibits a central vertex 3131 and two central lower endpoints 3132. It is evident that the first vertex 3111 and the first two lower endpoints 3112 of the radial section of the first end 311 are each located at the same positions as the central vertex 3131 and the two central lower endpoints 3132 of the radial section of the central region 313, such that the inner arc edges 317 of each arc-shaped region 31 can each specify a smooth arc shape and are connected to each other to form a circle; and that the outer arc edges 318 of the arc-shaped regions 31 can each specify a smooth arc shape and are connected to each other to form a circle. The entire wavy elastic protrusion 30 is smoother and can provide a more linear, symmetrical and balanced operating curve.

[0025] To ensure that the corrugated structure 1 has better symmetry, the wave-shaped elastic projection 30 and each arcuate area 31 can also be designed symmetrically. In the embodiment according to Fig. 3 For example, each arc-shaped region 31 can be arranged symmetrically by using the central region 313 as the center. Furthermore, in the embodiment according to Fig. 2. The wave-shaped elastic projection 30 has an odd number of arcuate regions 31 (in this embodiment, there are nine arcuate regions 31) and is arranged symmetrically with respect to a reference plane E. The reference plane E is coplanar to the first end 311 of one of the arcuate regions 31 and to the central region 313 of another arcuate region 31. The overall symmetry of the wave-shaped elastic projection 30 can thus be further improved, and a more symmetrical operating curve can be specified (for example, the stiffness-deflection curve described above).

[0026] In one embodiment, the curvature of the radial section (on Fig. (referring to point 5) each of the arc-shaped segments 315 and 316 in the central region 313 is determined by an interpolation calculation. In one embodiment of Fig. 7, for example, is the radial section of each arc-shaped region 31 at the first end 311 semicircular (shown as a dashed line D) and has a first vertex 3111 and two first lower endpoints 3112 (on Fig. 4 referring). A reference line L3 is defined between the two first lower endpoints 3112. A reference circle C is defined according to the first vertex 3111 and the midpoint of the reference line L3. Connecting lines L4 and L5 between the first vertex 3111 and the first lower endpoints 3112 pass through the reference circle C to form intersection points P1 and P2. The curvature (on Fig. (referring to section 5) each of the arc-shaped segments 315 and 316 in the middle region 313 is defined according to arcs A1 and A2 from the intersection points P1 and P2 to the first vertex 3111. For example, the curvature of an arc from an upper end of each of the arcs A1 and A2 in the direction of a tangent to each of the two first lower endpoints 3112 is the curvature of each of the arc-shaped segments 315 and 316 in the middle region 313.

[0027] In one embodiment, the curvature of the radial section of each of the arc-shaped segments 315 and 316 from the first end 311 to the central region 313, as well as the curvature of each of the arc-shaped segments 315 and 316 from the central region 313 to the second end 312, can be obtained by using a spline calculation. As in Fig. As shown in Figure 8, numerous first sampling points B1 with different heights can be defined at the first end 311 of each arc-shaped region 31. Numerous second sampling points B2, each corresponding to the numerous first sampling points B1, can be defined at the second end 312. The numerous first sampling points B1 are each connected to the numerous second sampling points B2 to form numerous splines S along a direction of extension of the corrugated structure 1. In this embodiment, the curvature of each of the arc-shaped segments 315 and 316 from the first end 311 to the central region 313 and the curvatures from the central region 313 to the second end 312 can be obtained according to the surfaces formed between the numerous splines S.

[0028] Based on the above description, in the surround structure of a loudspeaker according to this application, the curvature of the radial section of each arc-shaped segment gradually decreases from the first end to the middle region; and the curvature of the radial section of each arc-shaped segment gradually increases from the middle region to the second end, so that the surface of each arc-shaped region of the wave-like elastic projection exhibits variations in curvature instead of a uniform shape. Accordingly, the overall stiffness of the surround structure can be modified, and the surround structure exhibits a more linear operating curve as well as better symmetry and balance between negative and positive excursion. This effectively reduces sound distortion.

[0029] Fig. 9 to Fig. 10 are the measurement protocols according to an embodiment of the bead specified in this application.

[0030] Fig. Figure 9 shows the total harmonic distortion (THD) comparison between the embodiment of the surround (sine surround) specified in this application (solid line) and the conventional surround (dashed line). As in Fig. Figure 9 shows that at 60 Hz, when the power is increased (from 1 W to 32 W), the THD of the surround (sine surround) specified in this application (solid line) is much smaller than that of the conventional surround (dashed line).

[0031] Fig. Figure 10 shows the sound pressure level (SPL) comparison between the embodiment of the surround (sinusoidal surround) specified in this application (solid line) and the conventional surround (dashed line). As in Fig. Figure 10 shows that at 5% THD, when the frequency is increased (from 50 Hz to 300 Hz), the SPL of the surround (sine surround) specified in this application (solid line) is much larger than that of the conventional surround (dashed line).

[0032] Fig. Figure 11 shows the comparison of reciprocating vibrations between the embodiment of the bead (sinusoidal bead) specified in this application (solid line) and the conventional bead (dashed line). As in Fig. As shown in Figure 11, the deflection of the bead (sinusoidal bead) specified in this application (solid line) is more symmetrical than that of the conventional bead (dashed line) when the power is 32 W.

[0033] Although this application has been described above with reference to embodiments, these embodiments are not intended to limit the application. Any person skilled in the art can make some variations and modifications without deviating from the idea and scope of this application. Therefore, the scope of protection of this application shall be defined by the scope of the accompanying claims.

Claims

[1] Surround structure (1) for use in a loudspeaker, comprising: an inner margin (10); an outer edge (20); and a wave-shaped elastic projection (30) positioned between the inner edge (10) and the outer edge (20), wherein the wave-shaped elastic projection (30) is integrally formed from numerous arc-shaped regions (31); wherein each arc-shaped region (31) has: a first end (311), a second end (312) and a middle region (313) between the first end (311) and the second end (312), and a radial section of each arc-shaped region (31) is arc-shaped and has two arc-shaped segments (315, 316) as well as an upper edge (314) located between the two arc-shaped segments (315, 316); wherein the curvature of a radial section of each arc-shaped segment (315, 316) gradually decreases from the first end (311) to the middle region (313), the curvature of a radial section of each arc-shaped segment (315, 316) gradually increases from the middle region (313) to the second end (312), and the shape of a radial section of the first end (311) is the same as the shape of a radial section of the second end (312), wherein the upper edges (314) of the arc-shaped regions (31) are at the same height and are concyclic. [2] Ribbed structure (1) according to claim 1, wherein each arc-shaped region (31) has an inner arc edge (317) and an outer arc edge (318), the inner arc edges (317) of the arc-shaped regions (31) are at the same height and are concyclic, and the outer arc edges (318) of the arc-shaped regions (31) are at the same height and are concyclic. [3] Ribbed structure (1) according to one of claims 1 or 2, wherein each arc-shaped region (31) is arranged symmetrically by using the central region (314) as the center. [4] Beaded structure (1) according to one of the preceding claims, wherein the radial section of the first end and the radial section of the second end are semicircular. [5] Corrugated structure (1) according to one of the preceding claims, wherein the wave-shaped elastic projection (30) is arranged symmetrically with respect to a reference plane, and the reference plane is coplanar to the first end (311) or the second end (312) of one of the arc-shaped regions (31). [6] Corrugated structure (1) according to claim 5, wherein the corrugated elastic projection (30) has an odd number of arcuate regions (31), and the reference plane is furthermore coplanar to the central region (313) of another arcuate region (31). [7] Ribbed structure (1) according to one of the preceding claims, wherein each arc-shaped segment (315, 316) has a first point (3115) on the first end (311) and a second point (3125) on the second end (312), wherein the first point (3115) and the second point (3125) are at the same height, and a connecting line (CL) from the first point (3115) to the second point (3125) along a surface of the arc-shaped segment (315, 316) is a smooth curve. [8] Ribbed structure (1) according to any one of the preceding claims 4 to 7, wherein the radial section of the first end (311) of each arc-shaped region (31) has a first vertex (3111) and two first lower endpoints (3112), and a reference line (L3) is defined between the two first lower endpoints (3112), wherein a reference circle (C) is defined according to the first vertex (3111) and a midpoint of the reference line (L3), connecting lines (L4, L5) between the first vertex (3111) and the first lower endpoints (3112) pass through the reference circle (C) to form intersection points (P1, P2), and the curvature of each arc-shaped segment (315, 316) in the central region (313) is defined according to an arc from the intersection point (P1, P2) to the first vertex (3111). [9] Beaded structure (1) according to one of the preceding claims, wherein each arc-shaped region (31) has numerous first sampling points (B1) at positions of different heights at the first end (311) and numerous second sampling points (B2) at the second end (312), each corresponding to the numerous first sampling points (B1); and wherein the curvature of the radial section of each arc-shaped segment (315, 316) from the first end (311) to the middle region (313) and the curvature of the radial section from the middle region (313) to the second end (312) are defined according to corresponding connecting lines between the numerous first sampling points (B1) and the numerous second sampling points (B2). [10] Loudspeaker having the surround structure (1) according to any of the preceding claims.

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