JPH0145196Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a support structure for a vibrating system of an electric/acoustic transducer, and more particularly to a structure of an edge, a damper, etc. that supports a vibrating system such as a diaphragm of a speaker, a microphone, or a voice coil.

As shown in FIGS. 1 and 2, for example, as an edge structure for supporting the diaphragm of a speaker in the mid-high range, a voice coil is attached to an edge 3 disposed around the periphery of a diaphragm 1 to which a voice coil 2 is fixed. A line L _B connecting one point O on the second side and two points B′, B′ on the peripheral side,
A tangential type is known in which a large number of triangular pyramidal protrusions H having an apex A are formed extending in the tangential direction of the voice coil 2 on a triangular part defined by L _B in plan view. It is being Note that L _A in the figure is the ridgeline of the protrusion H.

According to the above-mentioned edge structure, since the rigidity of the voice coil 2 in the tangential direction is increased, rolling of the voice coil 2 can be effectively prevented.

However, since the triangular pyramid-shaped protrusions H are difficult to deform, the amplitude of the diaphragm 1 is obtained not by the deformation of the protrusions H but by the elongation of the material constituting the edges 3, and is thus limited to a constant value. Normally, in mid-high range speakers, the amplitude of the diaphragm 1 is small, so the edge structure described above can secure the diaphragm width to some extent, but it is difficult to make the diaphragm vibrate smoothly. It was insufficient.

The present invention was devised in view of the above circumstances, and its purpose is to effectively prevent the rolling of the voice coil, and also to enable smooth vibration of the diaphragm of the electro-acoustic transducer. The purpose is to provide a support structure for the system.

That is, the present invention provides a plurality of protrusions having ridge lines and valley lines in the tangential direction of the diaphragm outer periphery from the diaphragm toward the outer periphery between a diaphragm having a circular circumference and a circular outer periphery surrounding the diaphragm. A structure of a tangential type damper portion formed with a strip, wherein on the outer periphery side of each of the ridges, a line connecting the end point on the outer periphery side of the ridge line of the ridge line and a point on the outer periphery is shared as a base. At the same time, two triangular parts having apexes at the end points on the outer periphery side of the valley lines on both sides of the protruding strip are formed to face each other so that the bases thereof become the valley lines, and the triangular parts of the adjacent protruding strips and the outer circumferential edge A triangular portion is formed between the two, and each protruding strip is formed by changing the inclination angle of the triangular portion whose side is the outer periphery with respect to the surface direction of the damper portion, and by changing the opposing angle of the two opposing triangular portions. It is characterized by having variable facing angles on the sides.

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

FIG. 3 is a partially cutaway plan view showing an example of a speaker diaphragm equipped with the support structure of the present invention. In the figure, the same parts as those shown in FIGS. 1 and 2 are denoted by the same reference numerals, and the explanation thereof will be omitted.

In this embodiment, the hemispherical diaphragm 1 and its edge 3 are integrally formed of, for example, a plastic film.

The edge 3 is formed with protrusions H ₁ , H ₂ , . . . whose circumferential cross-section is chevron-shaped and whose width increases sequentially from the inner circumference (diaphragm 1 side) toward the outer circumference. These protrusions H ₁ , H ₂ ... extend in the tangential direction of the voice coil 2, and provide rigidity to the edge 3 in the tangential direction to prevent the voice coil 2 from rolling. It can be deformed to lift or sink as the voice coil 2 vibrates (see Fig. 4).

That is, the trough line _lc from the apex A _{1 , A 2 . .} . of the _protrusions H ₁ , H ₂ . It extends toward the center as if concentrating.

A ridgeline _l a connecting the tops A ₁ , A ₂ ... and the bottoms B ₁ , B ₂ ...
The pair of triangular parts 3b, 3b defined by the valley line _lc and the ridge line _lb have the valley line _lc as a common side, and as the voice coil 2 (diaphragm 1) moves, They are designed to either fold toward each other or to fold away from each other (see Figure 4).

In addition, the triangular portion 3c defined by the ridge lines l _b , l _b and the line L _C connecting the peripheral positions C ₁ , C ₂ . The bottom portions B _{1 ,} B _{2 .} . . of the protrusions H 1 , H 2 . Note that the degree of sagging of the triangular portions 3b, 3b in the direction toward each other and the degree of sagging in the direction of separating from each other are set equal, and the degree of sagging of the triangular portion 3c in the direction of approaching the voice coil 2 and the degree of sagging in the direction away from the voice coil 2 are set equal. The degree of standing up in the direction of separation is also set to be the same.

Next, the operation of the above embodiment will be explained.

First, as shown in Figure 5a, the voice coil 2
To explain the case where the end O moves in the direction of the arrow U, the peripheral part of the edge 3 is fixed to a frame (not shown) and forms angles C ₁ , C ₂ , C ₃ and angles C ₂ , C ₃ ,
Since C ₄ is within 180°, the triangular parts 3b, 3b fall down in the direction away from each other, and the triangular part 3c stands up. Therefore, the distance between the bottom portions B ₁ and B ₂ and between the bottom portions B ₂ and B ₃ widens, and the protrusions H ₁ , H _{2 .} . . deform as if sinking. In other words, when the triangular parts 3b, 3b, 3c fall down, the protrusions H ₁ , H ₂ ... are easily deformed, and the end O of the voice coil 2 can be easily moved in the direction of the arrow U, and the amount of movement is is triangular part 3
This can be sufficiently ensured by the degree of collapse of b, 3b, and 3c.

In addition, as shown in FIG. 5b, the voice coil 2
To explain the case where the end O moves in the direction of the arrow D, contrary to the above case, the triangular part 3b,
Since the triangular portions 3b fall down toward each other and the triangular portions 3c try to stand up away from the voice coil 2 side, between the ends B ₁ and B ₂ , B ₂ and B ₃
The space between them is reduced. Therefore, the protrusions H ₁ , H ₂ . . . deform as if lifted. In this case, the triangular part 3
b, 3b fall down, and the triangular portion 3c falls toward the voice coil 2 side, so that the protrusions H ₁ , H ₂ . It is easy to move, and the amount of movement can be sufficiently ensured by the degree of collapse of the triangular parts 3b, 3b and the degree of uprightness of the triangular part 3c.

Note that the triangular portion 3 when the voice coil 2 moves in the direction of arrow U and in the direction of arrow D
Since the degrees of collapse of diaphragms b, 3b, and 3c are set to be equal, the swing widths of the diaphragm 1 in the arrow U direction and the arrow D direction are approximately the same.

In Figure 6, the input to voice coil 2 is plotted on the horizontal axis.
This is a graph with the amplitude of the diaphragm 1 as the vertical axis, and the support structure of the above embodiment (shown by the solid line) has a higher oscillation width than the conventional support structure (shown in FIGS. The linearity has been improved.

FIG. 7 is a frequency characteristic diagram of a speaker equipped with a diaphragm equipped with the support structure of the above embodiment and a speaker equipped with a diaphragm equipped with the conventional support structure shown in FIGS. As is clear from this frequency characteristic diagram, distortion can be reduced by employing the support structure of the above embodiment.

In addition, although the above embodiment shows the case where the application is applied to the support structure of the diaphragm of a speaker, the application is not limited to this, and it can also be applied to the support structure of a damper that supports the voice coil of a speaker, the diaphragm of a microphone, etc. Of course, it can be applied.

As explained above, according to the support structure of the present invention, the outer peripheral edge of each tangential type protrusion is connected to the outer peripheral edge by combining triangular parts, so that the facing angle of the side surface of each protrusion is variable. This not only prevents the voice coil from rolling, but also has a structure in which the protrusions are easily deformed, making the voice coil etc. vibrate smoothly, and if the vibration width is made large, the vibration width of the diaphragm will be smaller in response to the input. It increases linearly, so it is possible to provide a speaker or microphone in the mid-to-high range with little distortion.

Furthermore, according to the support structure of the present invention, it is only necessary to simply add a V-groove to the mold for molding it, and the mold is less expensive than the mold for molding the conventional tangential type support structure. It can be implemented without any special cost increase.

[Brief explanation of the drawing]

Fig. 1 is a partial plan view of a conventional support structure, Fig. 2 is an enlarged perspective view of the same, Fig. 3 is a plan view of a diaphragm equipped with the support structure of the present invention, and Fig. 4 is an example of the present invention. FIG. 5 is an exploded perspective view of the support structure, FIGS. 5A and 5B are operation explanatory diagrams, FIG. 6 is an amplitude characteristic diagram, and FIG. 7 is a frequency characteristic diagram. 1...Diaphragm, 2...Voice coil, 3...Support piece, L _A ...Ridge line, L _B ...Line, la, _{l b ...} Ridge line,
l _c ... Valley line, 3a, 3b, 3c... Triangular part,
H ₁ , H ₂ ...Protrusions.

Claims (1)

[Claims for Utility Model Registration] A plurality of ridge lines and valley lines in the tangential direction of the diaphragm's outer periphery extending from the diaphragm toward the outer periphery between a diaphragm having a circular circumference and a circular outer periphery surrounding the diaphragm. A structure of a tangential type damper part in which a ridge line is formed, and on the outer periphery side of each ridge line, a line connecting the end point on the outer periphery side of the ridge line of the ridge line and a point on the outer periphery edge is the base. Two triangular parts that share the same shape and have apexes at the end points on the outer peripheral edge side of the valley lines on both sides of the protruding strip are formed so as to face each other so that the bases thereof become the valley lines,
A triangular part is formed between the triangular part and the outer periphery of an adjacent protrusion, and a change in the inclination angle of the triangular part whose side is the outer periphery with respect to the surface direction of the damper part, and Due to the change in the opposing angle of the triangular part,
A support structure for an electric/acoustic transducer vibration system, characterized in that the facing angle of the side surfaces of each protrusion is variable.