JPWO2019008638A1 - Diaphragm for speaker and speaker - Google Patents

Abstract

The diaphragm (11) is provided with a sound quality adjusting member (101) continuously from the inner peripheral end (100a) to the outer peripheral end (100b), and the outer peripheral end (100b) to which the edge (12) is attached. The sound quality adjusting member (101) is provided on the surface of the diaphragm main body (100).

Description

  The present invention relates to a speaker diaphragm that vibrates air and emits sound waves, and a speaker including the diaphragm.

  In order to improve the sound pressure frequency characteristics of the speaker, it has been conventionally performed to increase the rigidity of the diaphragm. For example, Patent Document 1 describes a speaker diaphragm in which a sound quality adjusting member is integrally formed on the back surface of a diaphragm main body in order to improve sound pressure frequency characteristics. In Patent Document 1, one end portion of the sound quality adjusting member is located on the outer peripheral end portion of the diaphragm main body.

JP 2015-82754 A

In Patent Document 1, an edge is pasted on the surface of the diaphragm. However, in this case, the height of the edge when viewed from the diaphragm on the front surface side is higher than when the edge is pasted on the back surface of the diaphragm. The edge interferes with the sound wave emitted by the diaphragm, such as reflecting the sound wave emitted from the diaphragm. The interference increases as the height of the edge when viewed from the diaphragm on the surface side increases. Further, when an edge is pasted on the surface of the diaphragm, the area of the diaphragm on the surface side is apparently reduced, which affects sound quality. Therefore, it is preferable that the edge is attached to the back surface rather than the front surface of the diaphragm. Further, the sound quality adjusting member for improving the sound pressure frequency characteristic is preferable because the improvement effect is higher as the length is longer.
However, when the sound quality adjusting member is provided up to the outer peripheral end of the diaphragm main body on the back surface as in Patent Document 1, even if an edge is pasted on the back surface of the diaphragm, it interferes with the sound quality adjusting member. Can not be pasted.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain a speaker diaphragm that can improve sound pressure frequency characteristics without interfering with an edge pasted on the rear surface of the diaphragm. And

  A speaker diaphragm according to the present invention includes a diaphragm body extending from an inner peripheral end portion to an outer peripheral end portion having a larger diameter than the inner peripheral end portion, a rising from the diaphragm main body, and an inner peripheral end portion. And a sound quality adjusting member provided continuously to the outer peripheral end portion, and the sound quality adjusting member is provided on the surface of the diaphragm main body at the outer peripheral end portion.

  According to the present invention, the sound quality adjusting member is continuously provided from the inner peripheral end portion to the outer peripheral end portion of the diaphragm main body, and is provided on the surface of the diaphragm main body at the outer peripheral end portion. Sound pressure frequency characteristics can be improved without interfering with the edges to be applied.

3 is a cross-sectional view of the speaker according to Embodiment 1. FIG. 2A is a perspective view when the diaphragm according to Embodiment 1 is viewed from the front surface side, and FIG. 2B is a perspective view when the diaphragm according to Embodiment 1 is viewed from the back surface side. 4 is a graph showing sound pressure frequency characteristics when the diaphragm according to Embodiment 1 is used. FIG. 4A is a diagram illustrating a cross section of the diaphragm of the first reference example, and FIG. 4B is a graph illustrating sound pressure frequency characteristics when the diaphragm is used. FIG. 5A is a diagram showing a cross section of the diaphragm of the second reference example, and FIG. 5B is a graph showing sound pressure frequency characteristics when the diaphragm is used. FIG. 6A is a diagram illustrating a cross section of the diaphragm of the third reference example, and FIG. 6B is a graph illustrating sound pressure frequency characteristics when the diaphragm is used. FIG. 7A is a diagram showing a cross section of the diaphragm of the fourth reference example, and FIG. 7B is a graph showing the sound pressure frequency characteristics when the diaphragm is used. FIG. 8A is a cross-sectional view showing a modification of the diaphragm according to Embodiment 1, and FIG. 8B is a graph showing sound pressure frequency characteristics when the modification is used. FIG. 9A is a diagram showing a line segment along which the sound quality adjusting member is seen in a plan view, and FIG. 9B is a diagram showing a curve along which the sound quality adjusting member is seen in a plan view as a modification. It is a figure which shows the cross section of the sound quality adjustment member cut | disconnected along the BB line in FIG. 2A. 11A and 11B are diagrams showing the height of the edge when viewed from the diaphragm.

Hereinafter, in order to explain the present invention in more detail, modes for carrying out the present invention will be described with reference to the accompanying drawings.
Embodiment 1 FIG.
FIG. 1 is a cross-sectional view of the speaker 1 according to the first embodiment.
The speaker 1 has a substantially cone-shaped diaphragm 11. Details of the diaphragm 11 will be described later with reference to FIGS. 2A and 2B. An edge 12 is provided on the outer periphery of the diaphragm 11 so that the planar view when viewed from the direction A in FIG. An inner peripheral end 12 a of the edge 12 is attached to the back surface of the diaphragm 11. Since the inner peripheral end 12a is pasted on the back surface of the diaphragm 11, the height h of the edge 12 when viewed from the diaphragm 11 can be suppressed as compared with the case of pasting on the surface of the diaphragm 11. Interference can be suppressed. As for the height h, a case where the inner peripheral end portion 12a of the edge 12 is temporarily attached to the surface of the diaphragm 11 is shown in FIG. 11A, like the speaker 1 according to the first embodiment shown in FIG. FIG. 11B shows a case where the inner peripheral end 12a of the edge 12 is attached to the back surface of the diaphragm 11.
An outer peripheral end 12 b of the edge 12 is fixed to the frame 14. In the diaphragm 11, the surface facing the outside of the speaker 1 is the front surface, and the surface on the back side of the front surface that faces the frame 14, a damper 21 described later, and the like is the back surface. A cylindrical bobbin 15 is inserted and fixed in the opening formed in the center of the diaphragm 11. A voice coil 16 is wound around and fixed to the outer peripheral surface of the bobbin 15.

The dome-shaped dust cap 17 is provided on the surface of the diaphragm 11 so as to cover one end of the bobbin 15. The other end of the bobbin 15 is supported by a pole piece 18. A magnet 19 is fixed to the pole piece 18, and a yoke 20 is provided at a position where the magnet 19 is sandwiched between the pole piece 18. The frame 14 is fixed to the yoke 20 and maintains the overall strength of the speaker 1.
The inner peripheral end of the damper 21 is fixed to the outer peripheral surface of the bobbin 15. The outer peripheral end of the damper 21 is fixed to the frame 14. The damper 21 is a member having an annular shape when seen from the direction A in FIG.

FIG. 2A is a perspective view when the diaphragm 11 is viewed from the front surface side, and FIG. 2B is a perspective view when the diaphragm 11 is viewed from the back surface side.
The diaphragm 11 includes a diaphragm main body 100 and a sound quality adjusting member 101. The diaphragm main body 100 is a substantially conical member that extends from the inner peripheral end portion 100a to the outer peripheral end portion 100b having a larger diameter than the inner peripheral end portion 100a. When the diaphragm body 100 is cut as shown in FIG. 1, the cross section has a curved shape. In the first embodiment, the curve has a radius of curvature of 60 mm on the inner peripheral end portion 100a side and an outer peripheral end portion. A case where the radius of curvature is 200 mm on the 100b side and the aperture of the speaker 1 is 16 cm will be described as an example.

  The sound quality adjustment member 101 is a rib-like member that rises from the diaphragm main body 100. 2A and 2B, the sound quality adjusting member 101 is provided on the front surface of the diaphragm main body 100 at the inner peripheral end portion 100a and the outer peripheral end portion 100b, and other portions are provided on the back surface of the diaphragm main body 100. Is provided. As shown in the cross section of FIG. 1, the sound quality adjusting member 101 is provided continuously from the inner peripheral end portion 100a to the outer peripheral end portion 100b, and traverses the diaphragm main body 100 along the radial direction. That is, when viewed from the front side as shown in FIG. 2A, the sound quality adjusting member 101 appears to be interrupted in the middle, and when viewed from the back side as shown in FIG. The sound quality adjustment member 101 passes through the diaphragm main body 100 from the front surface to the back surface or from the back surface to the front surface as shown in the cross section of FIG. And it is a continuous member without interruption from the inner peripheral end portion 100a to the outer peripheral end portion 100b.

The diaphragm 11 is made by injection molding of a resin material containing carbon fiber reinforced liquid crystal polymer, cyclic olefin resin, carbon nanotube or the like, and the diaphragm main body 100 and the sound quality adjusting member 101 are integrally molded.
2A and 2B show a case where a total of five sound quality adjusting members 101 that are continuous from the inner peripheral end portion 100a to the outer peripheral end portion 100b are provided, that is, with their positions shifted by 72 degrees from each other. The number of members 101 is not limited to the illustrated example, and may be increased or decreased as appropriate. Further, the arrangement intervals of the sound quality adjusting members 101 may not be equal.

In the speaker 1 configured as described above, since the voice coil 16 is fixed to the bobbin 15, when an audio signal is input to the voice coil 16, along the central axis X of the speaker 1 according to the audio signal. As a result, the bobbin 15 vibrates together with the voice coil 16. Since the diaphragm 11 is fixed to the bobbin 15, the diaphragm 11 also vibrates with the vibration of the bobbin 15. When the diaphragm 11 vibrates, the air around the diaphragm 11 vibrates and a sound wave is emitted.
FIG. 3 is a graph showing the sound pressure frequency characteristics when the diaphragm 11 is used.

Here, FIGS. 4A to 7A show a reference example for helping understanding of the diaphragm 11 according to the first embodiment. 4A to 7A, the frame 14, the damper 21 and the like are not illustrated as appropriate.
4A is a diagram illustrating a cross section of a diaphragm 11A as a first reference example, and FIG. 4B is a graph illustrating sound pressure frequency characteristics when the diaphragm 11A is used.
The diaphragm 11A includes a diaphragm main body 100 and a rib-like sound quality adjusting member 101A. That is, the diaphragm 11 and the diaphragm 11A are different in terms of a sound quality adjusting member.

  The sound quality adjusting member 101 </ b> A is all provided on the back surface of the diaphragm main body 100. The sound quality adjusting member 101A is not provided at the inner peripheral end portion 100a. That is, the sound quality adjusting member 101A is not continuously provided from the inner peripheral end portion 100a to the outer peripheral end portion 100b. Since the sound quality adjusting member 101A is provided on the back surface of the diaphragm main body 100 at the outer peripheral end portion 100b, the edge 12 is attached to the surface of the diaphragm 11A in order to avoid interference with the sound quality adjusting member 101A.

  Comparing FIG. 4B with FIG. 3, it can be seen that the peak is stronger at around 7000 Hz in FIG. 4B than in FIG. 3. This is because the sound quality adjusting member 101A is not provided at the inner peripheral end portion 100a, and is not provided continuously from the inner peripheral end portion 100a to the outer peripheral end portion 100b. This is because the plate 11A cannot suppress the generation of the axially symmetric vibration mode that greatly contributes to the peak and dip in the sound pressure frequency characteristics. The axially symmetric vibration mode is an axially symmetric vibration mode with respect to the central axis of the diaphragm.

FIG. 5A is a diagram showing a cross section of a diaphragm 11B as a second reference example, and FIG. 5B is a graph showing sound pressure frequency characteristics when the diaphragm 11B is used.
The diaphragm 11B includes a diaphragm main body 100 and a rib-like sound quality adjusting member 101B. That is, the diaphragms 11 and 11A and the diaphragm 11B are different in terms of the sound quality adjusting member.

  The sound quality adjusting member 101 </ b> B is all provided on the back surface of the diaphragm main body 100. The sound quality adjusting member 101B is not provided at the inner peripheral end portion 100a and the outer peripheral end portion 100b. That is, the sound quality adjusting member 101B is not continuously provided from the inner peripheral end portion 100a to the outer peripheral end portion 100b. Unlike the diaphragm 11A shown in FIG. 4A, since the sound quality adjusting member 101B is not provided on the back surface of the diaphragm main body 100 at the outer peripheral end portion 100b, the edge 12 can be attached to the back surface of the diaphragm 11B.

  Comparing FIG. 5B with FIG. 4B, it can be seen that in FIG. This is because the sound quality adjusting member 101B is not provided at the outer peripheral end portion 100b, and accordingly, the generation of the axially symmetric vibration mode cannot be suppressed.

6A is a diagram illustrating a cross section of a diaphragm 11C as a third reference example, and FIG. 6B is a graph illustrating sound pressure frequency characteristics when the diaphragm 11C is used.
The diaphragm 11C includes a diaphragm main body 100 and a rib-like sound quality adjusting member 101C. That is, the diaphragms 11, 11A, 11B and the diaphragm 11C are different in terms of the sound quality adjusting member.

  The sound quality adjusting member 101 </ b> C is all provided on the back surface of the diaphragm main body 100. The sound quality adjusting member 101C is continuously provided from the inner peripheral end portion 100a to the outer peripheral end portion 100b. Since the sound quality adjusting member 101C is provided on the back surface of the diaphragm main body 100 at the outer peripheral end portion 100b, the edge 12 is attached to the surface of the diaphragm 11C in order to avoid interference with the sound quality adjusting member 101C.

  Comparing FIG. 6B with FIG. 4B, it can be seen that the peak in the vicinity of 7000 Hz is suppressed in FIG. 6B compared to FIG. 4B, and the sound pressure frequency characteristics are improved. The sound pressure frequency characteristic shown in FIG. 6B is almost the same as the sound pressure frequency characteristic shown in FIG.

FIG. 7A is a diagram showing a cross section of a diaphragm 11D as a fourth reference example, and FIG. 7B is a graph showing sound pressure frequency characteristics when the diaphragm 11D is used.
The diaphragm 11D includes a diaphragm body 100 and a rib-like sound quality adjustment member 101D. That is, the diaphragms 11, 11A, 11B, 11C and the diaphragm 11D are different from each other in terms of a sound quality adjusting member.

  The sound quality adjusting member 101 </ b> D is all provided on the surface of the diaphragm main body 100. The sound quality adjusting member 101D is continuously provided from the inner peripheral end portion 100a to the outer peripheral end portion 100b. Unlike the diaphragm 11C shown in FIG. 6A, since the sound quality adjusting member 101D is not provided on the back surface of the diaphragm main body 100 at the outer peripheral end portion 100b, the edge 12 can be attached to the back surface of the diaphragm 11D.

Comparing FIG. 7B with FIG. 4B, it can be seen that the peak in the vicinity of 7000 Hz is suppressed in FIG. 7B compared to FIG. 4B, and the sound pressure frequency characteristics are improved. The sound pressure frequency characteristic shown in FIG. 7B is almost the same as the sound pressure frequency characteristic shown in FIG.
Note that the sound quality adjustment member 101D shown in FIG. 7A is required to be devised so that the dust cap 17 and the sound quality adjustment member 101D do not interfere with each other.

  As described above, when the sound quality adjusting member provided in the diaphragm main body 100 is provided continuously as long as possible, it can be seen that the effect of improving the sound pressure frequency characteristic is high. That is, when the sound quality adjusting member provided on the diaphragm main body 100 is continuously provided from the inner peripheral end portion 100a to the outer peripheral end portion 100b of the diaphragm main body 100, it can be seen that the effect of improving the sound pressure frequency characteristics is high. . At that time, if the sound quality adjusting member is continuously provided from the inner peripheral end portion 100a to the outer peripheral end portion 100b, the sound quality adjusting member 101 shown in FIGS. Or even if it passes the diaphragm main body 100 from the back surface to the front surface, it turns out that the improvement effect of the sound pressure frequency characteristic comparable as the sound quality adjustment members 101C and 101D shown to FIG.

  As shown in FIG. 1, when the sound quality adjusting member 101 is provided on the surface of the diaphragm main body 100 at the inner peripheral end portion 100a, the sound quality adjusting member 101 and the damper 21 are arranged even if the amplitude of the diaphragm 11 is large. Can be avoided, which is preferable. However, if the maximum possible amplitude of the diaphragm 11 is such that it does not contact the damper 21 in the first place, the sound quality adjusting member 101 may be provided on the back surface at the inner peripheral end portion 100a as shown in FIG. 8A. FIG. 8B is a graph showing the sound pressure frequency characteristics at this time. Even if the sound quality adjusting member 101 as shown in FIG. 8A is provided continuously from the inner peripheral end portion 100a to the outer peripheral end portion 100b of the diaphragm main body 100, the sound pressure frequency characteristic is shown in FIG. The same as 3.

2A and 2B, the sound quality adjusting member 101 is provided along a line connecting the inner peripheral end portion 100a and the outer peripheral end portion 100b. The line segment corresponds to the dotted line L1 in the drawing in a plan view of the diaphragm 11 as shown in FIG. 9A. However, the sound quality adjusting member 101 may be provided along a curved line such as a dotted line L2 in the drawing in a plan view of the diaphragm 11 as shown in FIG. 9B. In short, the sound quality adjusting member 101 only needs to be provided continuously along a line connecting the inner peripheral end portion 100a and the outer peripheral end portion 100b.
Further, the portion of the sound quality adjusting member 101 provided on the surface of the diaphragm main body 100 may be damaged when touched by the user. However, from the viewpoint of improving the sound pressure frequency characteristics, FIG. A portion between the inner peripheral end portion 100a and the outer peripheral end portion 100b of the sound quality adjusting member 101 shown in FIG. 8A may be appropriately provided on the surface instead of the back surface of the diaphragm main body 100. At this time, in order to avoid interference with the dust cap 17, the sound quality adjusting member 101 may be provided on the back surface of the diaphragm main body 100 only at a position where the dust cap 17 is provided.

Further, the height at which the sound quality adjusting member 101 rises from the diaphragm main body 100 may be uniform for all parts of the sound quality adjusting member 101 or may be different for each part. If the rising height is too low, the improvement in rigidity cannot be expected, so the effect of improving the sound pressure frequency characteristics is reduced. However, if it is too high, the mass of the sound quality adjusting member 101 increases and the output sound pressure decreases. Conceivable.
As already described, since the portion of the sound quality adjustment member 101 on the surface of the diaphragm main body 100 is convex toward the outside of the speaker 1, there is a possibility that the user touches it and breaks it. In addition, when a narrow and narrow shape such as the sound quality adjusting member 101 is molded by injection molding, insufficient filling due to gas escape failure during molding or resin clogging occurs, so the mold must be nested. . However, in addition to the mold for forming the sound quality adjusting member 101 on the back surface of the diaphragm main body 100, the mold for forming the sound quality adjusting member 101 on the front surface of the diaphragm main body 100 also has a nested structure. This makes the structure complicated and makes it difficult to manufacture the mold.

  Therefore, it is preferable to suppress the height of the sound quality adjusting member 101 on the surface of the diaphragm main body 100 as much as possible. At that time, not only simply reducing the height but also increasing the width can suppress the decrease in rigidity and obtain the same sound pressure frequency characteristic improvement effect as before the height is lowered. . For example, in the cross-sectional shape of the sound quality adjustment member 101 shown in FIG. 10, the length W in the width direction in contact with the diaphragm main body 100 is about 60 to 100% with respect to the length H in the height direction rising from the diaphragm main body 100. To be. The cross section shown in FIG. 10 is referred to FIG. 2A, and the portion of the sound quality adjusting member 101 provided on the surface of the diaphragm main body 100 is set in the direction C from the inner peripheral end to the outer peripheral end of the portion. It is a thing at the time of cut | disconnecting by a perpendicular | vertical surface, and the BB line in FIG. 2A turns into a cutting line.

  Even if the mass of the sound quality adjusting member 101 is increased by increasing the width, the sound quality adjusting member 101 is a diaphragm other than the inner peripheral end portion 100a and the outer peripheral end portion 100b as shown in FIGS. 1 and 8A. In the case of being on the back surface of the main body 100, the ratio of the sound quality adjusting member 101 on the surface of the diaphragm main body 100 to the total portion of the sound quality adjusting member 101 is about 10% on a cross-sectional area basis. There is not much decrease in the.

  As described above, according to the speaker 1 according to the first embodiment, the sound quality adjusting member 101 is continuously provided on the diaphragm 11 from the inner peripheral end portion 100a to the outer peripheral end portion 100b, and the edge 12 is The sound quality adjusting member 101 is provided on the surface of the diaphragm main body 100 at the outer peripheral edge 100b to be pasted. Thereby, the sound pressure frequency characteristic can be improved without interfering with the edge 12 attached to the back surface of the diaphragm 11.

  The sound quality adjusting member 101 is provided on the surface of the diaphragm main body 100 at the inner peripheral end portion 100a. If it does in this way, possibility that the sound quality adjustment member 101 will contact the damper 21 can be reduced.

  In addition, the portion of the sound quality adjusting member 101 provided on the surface of the diaphragm main body 100 has a length W in the width direction in contact with the diaphragm main body 100 with respect to a length H in the height direction in which the diaphragm main body 100 rises. 60 to 100%. If it does in this way, the sound quality adjustment member 101 will be hard to be damaged, and manufacture of the metal mold | die used by injection molding will also become easy.

  Note that the shape of the diaphragm 11 is not limited to that exemplified above. That is, the shape of the diaphragm 11 may be various shapes such as a paracurved shape, a straight shape, or a parabolic shape. Further, the curvature of the diaphragm 11 and the aperture of the speaker 1 are not limited to the above numerical values. Even if the aperture of the speaker 1 is, for example, 10 cm or 15 cm, the same effect as described above can be obtained.

  Further, in the present invention, any constituent element of the embodiment can be modified or any constituent element of the embodiment can be omitted within the scope of the invention.

  As described above, since the diaphragm for a speaker according to the present invention can improve the sound pressure frequency characteristics without interfering with the edge pasted on the back surface of the diaphragm, the speaker is required to have excellent sound quality. Particularly suitable for use.

  DESCRIPTION OF SYMBOLS 1 Speaker, 11, 11A-11D Diaphragm, 12 edge, 12a Inner edge part, 12b Outer edge part, 14 Frame, 15 Bobbin, 16 Voice coil, 17 Dust cap, 18 Pole piece, 19 Magnet, 20 York, 21 Damper, 100 diaphragm main body, 100a inner peripheral end, 100b outer peripheral end, 101, 101A to 101D sound quality adjusting member.

Claims (4)

A diaphragm main body extending from the inner peripheral end to the outer peripheral end having a larger diameter than the inner peripheral end,
A sound quality adjusting member provided from the diaphragm main body and continuously provided from the inner peripheral edge to the outer peripheral edge;
The speaker diaphragm according to claim 1, wherein the sound quality adjusting member is provided on a surface of the diaphragm main body at the outer peripheral end portion.   The speaker diaphragm according to claim 1, wherein the sound quality adjusting member is provided on a surface of the diaphragm main body at the inner peripheral end.   Of the sound quality adjusting member, the portion provided on the surface of the diaphragm main body has a length in the width direction in contact with the diaphragm main body of 60 to 100% of the length in the height direction rising from the diaphragm main body. The diaphragm for a speaker according to claim 1 or 2, wherein   A speaker comprising the diaphragm for a speaker according to claim 1.

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