JP2008048300A - Speaker, and speaker edge used therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress occurrence of an abnormal sound caused by shrinkage of an edge material in a speaker having a speaker edge. <P>SOLUTION: The present invention relates to a speaker comprising: a frame; a magnetic circuit supported by the frame; a voice coil body disposed to be movable with respect to a magnetic gap provided to the magnetic circuit; a diaphragm 11 whose inner circumferential portion is adhered to the voice coil body; and an edge 12 whose inner circumferential portion is adhered to the outer circumferential portion of the diaphragm 11 and whose outer circumferential portion is adhered to the frame, and the edge comprises a high-density part 12A and a low-density part 12B. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a speaker and a speaker edge used therefor.

  Conventionally, this type of speaker has a frame, a magnetic circuit supported by the frame, a voice coil body that is movably disposed with respect to a magnetic gap provided in the magnetic circuit, and a voice coil body. A diaphragm having a peripheral portion bonded thereto, and an edge having an inner peripheral portion bonded to the outer peripheral portion of the diaphragm and an outer peripheral portion bonded to the frame, the edge as shown in FIG. It was comprised from the plane parts 1A and 1B and the curved surface part 2, and was formed so that it might have a uniform density with materials, such as urethane foam.

As prior art document information relating to this application, for example, Patent Document 1 is known.
JP-A-5-328489

  In such a conventional speaker, the occurrence of abnormal noise has been a problem.

  That is, in the above-described conventional configuration, as a signal is input to the magnetic circuit and the voice coil body vibrates back and forth, as shown in FIG. 15, the diaphragm 3 whose inner peripheral portion is bonded to the voice coil body. Vibrates back and forth.

  At this time, each point 2A in the curved surface portion 2 moves to the outer diameter side when the diaphragm 3 is displaced forward, and moves to the inner diameter side when the diaphragm 3 is displaced rearward.

  Then, when the diaphragm 3 is displaced rearward, each point 2A existing on the outer diameter side having a long circumferential length moves to the inner diameter side having a shorter circumference. Has occurred, and abnormal shapes such as Ekbo and wrinkles have occurred, and the generation of abnormal sounds due to these has become a problem.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to suppress the generation of abnormal sounds caused by contraction of edge material in a speaker having speaker edges.

  In order to achieve this object, the present invention includes a frame, a magnetic circuit supported by the frame, a voice coil body disposed in a movable state with respect to a magnetic gap provided in the magnetic circuit, A diaphragm having an inner peripheral portion bonded to the voice coil body, and an edge having the inner peripheral portion bonded to the outer peripheral portion of the diaphragm and the outer peripheral portion bonded to the frame. Is a speaker provided with a high density portion and a low density portion.

  The speaker of the present invention has a configuration in which the edge has a high density portion and a low density portion, so that the diaphragm is displaced rearward, and each point existing on the outer diameter side having a long circumferential length is a circle. Even if it moves to the inner diameter side where the circumference is short, the low-density part absorbs the strain stress generated in the high-density part. Can be suppressed.

(Embodiment 1)
The speaker according to Embodiment 1 of the present invention will be described below with reference to the drawings.

  As shown in FIG. 1 which is a perspective view showing a part of an edge and a diaphragm in the speaker of the present embodiment, the inner periphery of an annular edge 12 is bonded to the outer periphery of a disk-like diaphragm 11. The edge 12 is composed of flat portions 13A and 13B and a curved surface portion 14. The plane portions 13A and 13B of the edge 12 are formed by the high density portions 12A, and the curved surface portion 14 is configured such that the high density portions 12A and the low density portions 12B are alternately repeated. The high density portion 12A is shaded, and the low density portion 12B is white.

  Here, as a signal is input to the magnetic circuit (not shown) and the voice coil body (not shown) vibrates back and forth, the diaphragm 11 having the inner periphery bonded to the voice coil body is moved back and forth. Vibrate.

  At this time, each portion of the curved surface portion 14 moves to the outer diameter side when the diaphragm 11 is displaced forward, and moves to the inner diameter side when the diaphragm 11 is displaced rearward. The high-density portion 12A and the low-density portion 12B segregate their actions, thereby making it possible to achieve both suppression of breakage of the edge 12 and relaxation of strain stress.

  That is, when the diaphragm 11 moves to the outer diameter side, the high-density portion 12A moves in the radial direction while maintaining high tensile strength and springiness, thereby enabling the edge 12 to be prevented from breaking. When the vibration plate 11 moves to the inner diameter side, the strain stress generated in the high density portion 12A is absorbed by the low density portion 12B, so that the strain stress in the edge 12 can be relaxed.

  With such a configuration, even when the diaphragm 11 is displaced rearward and each point existing on the outer diameter side having a long circumferential length moves to the inner diameter side having a shorter circumference, the high density portion Since the distortion stress generated in 12A can be absorbed by the low-density portion 12B, it is possible to suppress the generation of abnormal noise due to the occurrence of abnormal shapes such as ecbos and wrinkles.

  In the present embodiment, each of the high-density portion 12A and the low-density portion 12B is configured to be point-symmetric with respect to the center of the edge 12, but the vibration is not required even if the configuration is not point-symmetrical. When the plate 11 moves to the inner diameter side, the strain stress generated in the high density portion 12A can be absorbed by the low density portion 12B. And as a result, the effect that generation | occurrence | production of the abnormal sound resulting from the generation | occurrence | production of the dimples and wrinkles which are abnormal shapes can be acquired can be acquired. However, by adopting a configuration that is arranged point-symmetrically, there is an advantage that distortion in the outer peripheral portion of the edge 12 can be reduced.

  In the present embodiment, the high-density portion 12A and the low-density portion 12B are arranged at equal intervals. However, the diaphragm 11 moves to the inner diameter side even if not arranged at equal intervals. In this case, the strain stress generated in the high density portion 12A can be absorbed by the low density portion 12B. And as a result, the effect that generation | occurrence | production of the abnormal sound resulting from the generation | occurrence | production of the dimples and wrinkles which are abnormal shapes can be acquired can be acquired. However, by arranging them at equal intervals, there is an advantage that distortion in the outer peripheral portion of the edge 12 can be reduced.

  In addition, by impregnating the low density portion 12B with the fluorine-modified resin, the shielding effect of the edge 12 can be ensured and the waterproof property required for the vehicle-mounted speaker can be achieved.

  Next, a method for manufacturing the speaker edge shown in the present embodiment will be described.

  First, as shown in FIG. 2, the foam-like base material 21 made of urethane foam before heat compression molding has a thick film portion 22A and a thin film portion 22B. FIG. 3 is a cross-sectional view taken along the line A-AA in FIG. 2 and shows a state in which the thick film portions 22A and the thin film portions 22B are alternately arranged.

  Such a foam-like base material 21 is energized at intervals in the thickness direction while compressing the foamed urethane raw material with ribbed frames arranged in a circumferential direction having a diameter corresponding to the roll portion of the speaker edge. The thick film portion 22A and the thin film portion 22B can be formed by slicing with the formed nichrome wire or the like.

  Here, the foam-like base material 21 is impregnated with a fluorine deformation resin. This is for improving airtightness and waterproofness.

  Next, the foam-like base material 21 is attached to a misalignment prevention guide provided in an edge molding die, and heat compression molding is performed so as to have a constant thickness.

  By adopting such a manufacturing method, the thick film portion 22A of the foam-like substrate 21 shown in FIG. 2 becomes the high density portion 12A shown in FIG. 1, and the thin film portion 22B becomes the low density portion 12B shown in FIG. . In this way, the speaker edge 12 shown in FIG. 1 can be formed.

  In the present embodiment, the method of forming the thick film portion 22A and the thin film portion 22B on the foam-like base material 21 by slicing has been described. However, as shown in FIG. 13, the thin film portion 22B of FIG. The upper foam-like base material 23 having a hole 23A in a portion corresponding to the above and the non-porous lower foam-like base material 24 may be overlapped. In this case, the portion corresponding to the hole 23A becomes the thin film portion 22B, and the other portion becomes the thick film portion 22A.

(Embodiment 2)
Hereinafter, the speaker according to Embodiment 2 of the present invention will be described with reference to the drawings.

  As shown in FIG. 4 which is a perspective view showing a part of the edge and the diaphragm in the speaker of the present embodiment, the inner periphery of a square edge 42 is bonded to the outer periphery of the diaphragm 41. The edge 42 is composed of plane portions 43A and 43B and a curved surface portion 44. As shown in FIG. 5, the flat portions 43A and 43B of the edge 42 are formed by high density portions, and the curved surface portion 44 is configured such that the high density portions 42A, medium density portions 42B, and low density portions 42C are repeated. It is said. Here, the high density portion 42A is shaded, the medium density portion 42B is shaded, and the low density portion 42C is white.

  Specifically, the high density portion 42A is disposed in a portion corresponding to the square side, the low density portion 42C is disposed in a portion corresponding to the corner, and the medium density portion 42B is disposed in the middle.

  The reason will be described below. When the substantially rectangular diaphragm 41 is displaced rearward, each point existing on the outer diameter side having a long circumferential length is short if the ring-shaped edge is as shown in the first embodiment. In order to move to the inner diameter side having the circumferential length, it is necessary to relieve the strain stress generated in the entire edge by alternately arranging the high density portion and the low density portion as described above. Here, in the portion corresponding to the square side in the square edge 42 shown in the present embodiment, the diaphragm 41 moves back and forth as much as the length between the inner diameter side and the outer diameter side does not change. The occurrence of the above-described strain stress due to this is reduced. On the other hand, in the portion corresponding to the square corner, the difference in length between the inner diameter side and the outer diameter side becomes very large, so that the above-described distortion stress caused by the longitudinal movement of the diaphragm 41 is generated. Becomes enormous. Therefore, the high density portion 42A is disposed in the portion corresponding to the square side, the low density portion 42C is disposed in the portion corresponding to the corner, and the medium density portion 42B is disposed in the middle.

  With such a configuration, at the time when the diaphragm 41 moves forward at the square edge 42, the high-density portion 42A moves in the radial direction while maintaining high tensile strength and springiness. In addition, when the diaphragm 41 is displaced rearward, distortion stress generated frequently at the corners of the square shape can be effectively relieved by the low density portion 42C. It is possible to suppress the generation of abnormal sounds due to the occurrence of wrinkles.

(Embodiment 3)
Hereinafter, the speaker according to Embodiment 3 of the present invention will be described with reference to the drawings.

  As shown in FIG. 6, which is a top view of the edge and the diaphragm of the speaker of the present embodiment, the inner periphery of an elliptical ring-shaped edge 62 is bonded to the outer periphery of the diaphragm 61, and the plane of the edge 62 The parts 63A and 63B are formed by a high density part, and the curved surface part 64 is formed by a high density part 62A, a medium density part 62B, and a low density part 62C. Here, the high density portion 62A is shaded, the medium density portion 62B is hatched, and the low density portion 62C is white.

  Specifically, the high density portion 62A is disposed in a portion having a small curvature in the elliptical ring shape, the low density portion 62C is disposed in a portion having a large curvature, and the medium density portion 62B is disposed in the middle thereof.

  The reason will be described below. In the elliptical ring-shaped edge 62, in the portion where the curvature is small, the above-described distortion stress is generated due to the back-and-forth movement of the diaphragm 61 due to the small difference in length between the inner diameter side and the outer diameter side. Less. On the other hand, in the portion having a large curvature, the difference in length between the inner diameter side and the outer diameter side becomes large, so that the generation of the above-described strain stress due to the back and forth movement of the diaphragm 61 becomes enormous. . Accordingly, the high density portion 62A is disposed in a portion with a small curvature, the low density portion 62C is disposed in a portion with a large curvature, and the medium density portion 62B is disposed in the middle.

  With such a configuration, when the diaphragm 61 moves forward at the elliptical ring-shaped edge 62, the high-density portion 62A moves in the radial direction while maintaining high tensile strength and springiness, so that the fracture is suppressed. In addition, when the diaphragm 61 is displaced rearward, distortion stress that is often generated at the corners can be effectively relieved by the low density portion 62C, so that abnormal shapes such as ecbos and wrinkles are generated. It is possible to suppress the generation of abnormal sounds due to the fact that

(Embodiment 4)
Hereinafter, a speaker according to Embodiment 4 of the present invention will be described with reference to the drawings.

  As shown in FIG. 7 which is the top view of the edge and the diaphragm of the speaker of the present embodiment, the inner periphery of the annular edge 72 is bonded to the outer periphery of the disk-shaped diaphragm 71, As shown in FIG. 8, the flat portions 73A and 73B of the edge 72 are formed by high density portions, and the curved surface portion 74 is formed by high density portions 72A and low density portions 72B. Here, the high density portion 72A is shaded, and the low density portion 72B is white.

  Specifically, as shown in FIG. 7, in the curved surface portion 74, the high-density portion 72 </ b> A and the low-density portion 72 </ b> B are formed in a rotational radial shape from the center direction around the edge 72.

  With such a configuration, the high density portions 72A and the low density portions 72B can be alternately arranged in the circumferential direction and the radial direction of the curved surface portion 74. As a result, not only can the strain stress generated in the circumferential direction be relieved, but also the strain stress generated in the radial direction can be relaxed, and abnormal noise caused by the occurrence of abnormal shapes such as ecbos and wrinkles can be generated. Can be suppressed.

(Embodiment 5)
Hereinafter, a speaker according to Embodiment 5 of the present invention will be described with reference to the drawings.

  As shown in FIG. 9 which is a top view of the edge and the diaphragm of the speaker according to the present embodiment, the inner periphery of the ring-shaped edge 92 is bonded to the outer periphery of the disk-shaped diaphragm 91. As shown in FIG. 10, the flat portions 93A and 93B of the edge 92 are formed by high density portions, and the curved surface portion 94 is formed by high density portions 92A and low density portions 92B. Here, the high density portion 92A is shaded, and the low density portion 92B is white.

  Specifically, as shown in FIG. 9, in the curved surface portion 94, the high-density portion 92 </ b> A and the low-density portion 92 </ b> B are rotated and radiated clockwise from the center direction around the edge 92, and the counterclockwise shape. It is the structure which added the shape which carries out rotation radiation in the rotation direction.

  With such a configuration, the high density portions 92A and the low density portions 92B can be alternately arranged in the circumferential direction and the radial direction of the curved surface portion 94. As a result, not only can the strain stress generated in the circumferential direction be relieved, but also the strain stress generated in the radial direction can be relaxed, and abnormal noise caused by the occurrence of abnormal shapes such as ecbos and wrinkles can be generated. Can be suppressed.

  Furthermore, since the high-density portion 92A can be arranged axisymmetrically, the diaphragm 91 can be held without applying a rotating force to the diaphragm 91 during the longitudinal movement of the diaphragm 91. As a result, the diaphragm 91 Can be prevented from rotating.

(Embodiment 6)
The speaker according to Embodiment 6 of the present invention will be described below with reference to the drawings.

  As shown in FIG. 11 which is a top view of the edge and the diaphragm in the speaker of the present embodiment, the inner periphery of the ring-shaped edge 112 is bonded to the outer periphery of the disk-shaped diaphragm 111. As shown in FIG. 12, the flat portions 113A and 113B of the edge 112 are formed by high density portions, and the curved surface portion 114 is formed by high density portions 112A and low density portions 112B. Here, the high density portion 112A is shaded, and the low density portion 112B is white.

  Specifically, as shown in FIG. 11, in the curved surface portion 114, the inner peripheral side is constituted by the low density portion 112B, and the outer peripheral side is constituted by the high density portion 112A. In the drawing, a two-stage configuration is used for simplification, but actually, the density is increased stepwise from the inner circumference side toward the outer circumference side.

  With such a configuration, the bending rigidity can be increased from the inner peripheral portion toward the outer peripheral portion. Therefore, an excessive input is applied to the magnetic circuit of the speaker, and the diaphragm 111 performs a large amplitude back-and-forth motion. Even in this case, the edge 112 can be prevented from being broken.

  INDUSTRIAL APPLICABILITY The speaker and the speaker edge of the present invention are useful because they can suppress the generation of abnormal sounds due to the contraction of the edge material.

1 is a partially cutaway perspective view of a speaker according to Embodiment 1 of the present invention. The top view of the foam-form base material of the speaker edge in Embodiment 1 of this invention Sectional drawing of the foam-form base material of the speaker edge in Embodiment 1 of this invention The partially cutaway perspective view of the speaker according to Embodiment 2 of the present invention. The top view which shows the edge for speakers and diaphragm of Embodiment 2 of this invention The top view which shows the edge for speakers and diaphragm of Embodiment 3 of this invention The top view which shows the edge for speakers and diaphragm of Embodiment 4 of this invention The partially cutaway perspective view of the speaker according to Embodiment 4 of the present invention. The top view which shows the edge for speakers and the diaphragm of Embodiment 5 of this invention The partially cutaway perspective view of the speaker according to Embodiment 5 of the present invention. The top view which shows the edge for speakers and diaphragm of Embodiment 6 of this invention Sectional drawing of the edge for speakers in Embodiment 6 of this invention The figure which shows the manufacturing process of the edge for speakers in Embodiment 1 of this invention. Top view of speaker edge and diaphragm of conventional speaker Sectional drawing which shows operation | movement of the edge for speakers of a conventional speaker, and a diaphragm

Explanation of symbols

11 Diaphragm 12 Edge 12A High density part 12B Low density part

Claims (18)

A frame, a magnetic circuit supported by the frame, a voice coil body disposed in a movable state with respect to a magnetic gap provided in the magnetic circuit, and a vibration in which an inner peripheral portion thereof is bonded to the voice coil body A speaker having a high-density part and a low-density part on the edge, and an edge having an inner peripheral part bonded to the outer peripheral part of the diaphragm and an outer peripheral part bonded to the frame . The speaker according to claim 1, wherein the high density portions and the low density portions are alternately arranged in the circumferential direction at the edge. The speaker according to claim 2, wherein each of the high density portion and the low density portion is arranged point-symmetrically with respect to the center of the circumference. The speaker according to claim 2, wherein each of the high density portion and the low density portion is arranged at equal intervals in the circumferential direction. The edge has an elliptical ring shape, and a low density portion is arranged in a portion with a large curvature in the elliptical ring shape, and a high density portion is arranged in a portion with a small curvature in the elliptical ring shape. Speaker. The speaker according to claim 2, wherein the edge has a rectangular shape, and a low-density portion is disposed at a corner portion of the rectangular shape, and a high-density portion is disposed at a side portion of the rectangular shape. The speaker according to claim 1, wherein the high density portion and the low density portion are alternately arranged in the circumferential direction and the radial direction at the edge. The speaker according to claim 7, wherein each of the high density portion and the low density portion is arranged symmetrically with respect to the center of the circumference. The speaker according to claim 7, wherein the high density portion and the low density portion are arranged at equal intervals in the circumferential direction. The speaker according to claim 1, wherein the low density portion is disposed on an inner peripheral side of the curved surface portion of the edge, and the high density portion is disposed on an outer peripheral portion of the curved surface portion of the edge. A speaker edge having a high density portion and a low density portion, and alternately arranging the high density portion and the low density portion in the circumferential direction. The speaker edge according to claim 11, wherein each of the high density portion and the low density portion is arranged point-symmetrically with respect to the center of the circumference. The speaker edge according to claim 11, wherein the high density portion and the low density portion are arranged at equal intervals in the circumferential direction. 12. The configuration according to claim 11, wherein the circumference has an elliptical ring shape, and a low density portion is disposed in a portion having a large curvature in the elliptical ring shape, and a high density portion is disposed in a portion having a small curvature in the elliptical ring shape. Speaker edge. The speaker edge according to claim 14, wherein the periphery has a rectangular shape, and low density portions are arranged at corner portions of the rectangular shape, and high density portions are arranged at side portions of the rectangular shape. An edge for a speaker having a high density portion and a low density portion, and alternately arranging the high density portion and the low density portion in a circumferential direction and a radial direction. The speaker edge according to claim 16, wherein each of the high density portion and the low density portion is arranged point-symmetrically with respect to the center of the circumference. The speaker edge according to claim 16, wherein the high density portion and the low density portion are arranged at equal intervals in the circumferential direction.

Images