JP3132253B2 - Edge for speaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loudspeaker edge used for various kinds of audio equipment, and more particularly to an edge having an elliptical or non-circular shape.

[0002]

2. Description of the Related Art Conventionally, a speaker edge of this type has a function of supporting a diaphragm by forming a cloth or a urethane foam sheet into a roll shape or a corrugated shape and pasting them on the outer periphery of the diaphragm. In some cases, even when the shape of the diaphragm is circular or non-circular, all the diaphragms have the same structure and material without using any special means.

Hereinafter, a speaker edge used for a conventional non-circular diaphragm as described above will be described with reference to the drawings.

FIGS. 2 (a) to 2 (c) show a speaker edge pasted on a conventional elliptical diaphragm. FIG. 2 (a) is a plan view showing the whole, and FIG. Figure 2)
FIG. 2A is a sectional view showing a section AA ′, and FIG. 2C is a sectional view showing the same section BB ′.

In FIGS. 2 (a) to 2 (c), 1 is an elliptical diaphragm, 2 is a speaker edge attached to the outer periphery of the diaphragm 1, and 3 is fixed to the center of the diaphragm 1. Voice coil.

The operation of the conventional speaker edge 2 configured as described above will be described below.

First, a voice coil 3 held in a magnetic gap (not shown) of a magnetic circuit vibrates up and down by an audio signal applied to a speaker, and the movement thereof is changed by the diaphragm 1.
And vibrates the air to generate sound. At this time, the speaker edge 2 supports the movement of the diaphragm 1, and the performance of the speaker edge 2 affects the performance of the speaker.

[0008]

However, in the above-mentioned conventional configuration, the loudspeaker edge 2 is made of the same shape and the same material over the entire circumference, so that its stiffness (movability) is also equal.

However, the distance from the voice coil 3 to the speaker edge 2 is different because the diaphragm 1 is non-circular, so that the component force applied to the speaker edge 2 in the driving force from the voice coil 3 is not equal. As a result, the supporting force of the entire periphery of the diaphragm 1 becomes unbalanced, and the vertical movement of the diaphragm 1 cannot be performed smoothly, causing distortion.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide an excellent speaker edge that can be supported with a uniform holding force over the entire circumference of a non-circular diaphragm.

[0011]

In order to solve this problem, an edge for a loudspeaker according to the present invention is connected to the outer periphery of an elliptical or non-circular diaphragm, and has a shorter width than the width of the diaphragm on the major diameter side. The configuration is such that the width on the radial side is reduced, and the length dimension when deployed at any position over the entire circumference is equal.

[0012]

With this configuration, the stiffness can be equivalently made equal over the entire circumference of the speaker edge by changing the width of the speaker edge on the long side and the short side in the diaphragm direction. It is possible to equalize the maximum amplitude amount by making the developed length equal over the entire circumference, and the support force of the speaker edge is equal over the entire circumference of the diaphragm, so that the speaker can be supported in a well-balanced manner.
An edge for a speaker that can provide a speaker having excellent performance with little distortion.

[0013]

An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1A to 1C show a speaker edge according to an embodiment of the present invention.
1 is a plan view showing the whole, and FIG. 1B is a cross-sectional view A of FIG.
1 (c) is a cross-sectional view showing the same cross section BB '. In FIGS. 1 (a) to 1 (c), 1 is a diaphragm, 3 is a voice coil, and 4 is a same. The speaker edge 4 according to the embodiment, the speaker edge 4 has a width on the shorter diameter side 4b smaller than the width on the longer diameter side 4a of the diaphragm 1 and is developed at any position over the entire circumference. It is configured so that the lengths when they are set are equal.

The operation of the loudspeaker edge of the present invention configured as described above will be described. First, a voice signal applied to a speaker causes a voice coil 3 held in a magnetic gap (not shown) of a magnetic circuit to vibrate up and down, and its movement is transmitted to a diaphragm 1 to vibrate air and generate voice. Is to occur. At this time, since the diaphragm 1 is non-circular, the distance from the center where the driving force from the voice coil 3 is transmitted to the speaker edge 4 is different, and the component of the driving force applied to the speaker edge 4 is also different. According to the present invention, the stiffness of the speaker edge 4 is changed in accordance with the component force of the driving force, so that the driving force component is equivalently equal at any position of the speaker edge 4. .

For example, on the major diameter side 4a of the diaphragm 1,
In order to reduce the component of the driving force, the width is widened so that the stiffness of the speaker edge 4 is also reduced. On the other hand, the component of the driving force is increased on the same minor diameter side 4b. The width of the loudspeaker edge 4 is reduced so that the stiffness of the loudspeaker edge 4 is correspondingly increased, and the stiffness of the loudspeaker edge 4 is made to correspond to the component of the driving force from the voice coil 3 over the entire circumference. Therefore, the displacement of the diaphragm 1 becomes the same as a whole, and vibration with little distortion is possible.

Further, since the wide edge portion 4a and the narrow edge portion 4b are made equal in length when they are developed, the displacement amount of the diaphragm 1 is always constant at any position. The amounts can be the same, which also has the effect of reducing distortion.

In this embodiment, the stiffness of the speaker edge 4 is realized by changing its width.
In addition, if the development length is the same, the shape may be changed, for example, an M-shape, an S-shape, or the like may be realized.

The present invention may also be realized by partially changing the hardness of the material forming the edge while having the same shape.

[0020]

As described above, according to the present invention, the stiffness of the loudspeaker edge connected to the outer periphery of the non-circular diaphragm is larger on the minor diameter side than on the major diameter side of the diaphragm. By adopting a configuration in which the development length in the direction is made equal over the entire circumference, the difference in the component force of the driving force from the voice coil is absorbed, and the equivalent stiffness over the entire circumference is realized, and the distortion is excellent. The present invention provides an edge for a speaker.

[Brief description of the drawings]

FIG. 1A is a plan view showing a configuration of a speaker edge according to an embodiment of the present invention. FIG. 1B is a sectional view taken along the line AA ′. FIG.

FIG. 2A is a plan view showing a configuration of a conventional speaker edge. FIG. 2B is a sectional view taken along the line AA ′. FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Diaphragm 3 Voice coil 4 Speaker edge 4a Wide part of edge 4b Narrow part of edge

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04R 7/20

Claims (1)

(57) [Claims] 1. A diaphragm connected to the outer periphery of an elliptical or non-circular diaphragm, which has a narrower width in a shorter diameter direction than a width in a longer diameter direction of the diaphragm, and is developed at any position over the entire circumference. Edges for speakers with equal length dimensions.