JPH0241990Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a diaphragm for sound reproduction, and more particularly, to a diaphragm for sound reproduction suitable for a circular shape in plan view.

A diaphragm for sound reproduction, also known as a diaphragm for speakers, is the most important component for converting electrical audio signals into mechanical and physical audio signals. There is a type of diaphragm that is circular in plan view. Ideally, this diaphragm should accurately follow the piston movement of the voice coil, which is the driver unit, so that the entire piston movement is uniform, but in reality, split vibrations and distortions in the suspension etc. may cause the diaphragm. Therefore, the entire piston does not move uniformly.

Therefore, in order to suppress the split vibration of the diaphragm and ensure accurate piston movement, the
The diaphragm shown in the figure is known. That is, the diaphragm 1
An edge 2 is formed along the outer peripheral edge 1a, and a plurality of ribs 3 are regularly formed on this edge 2 along a tangent at one point of the outer peripheral edge 1a. The inner end of this rib 3 is along the tangent at a point on the outer end of the diaphragm 1, but the outer end 3b is not tangential to the outer periphery of the edge 2, but intersects at a certain angle. It's getting old.

Moreover, since the edge 2 is donut-shaped and has a curved surface, the distance from the apex of the curved surface to both ends of the rib 3 is the distance from the apex to the inner end 3 of the rib 3.
The rib 3 is longer than the rib 3a, and the closer it is to the inner end 3a, the smaller the width and depth of the rib 3 are.
The edge is soft on the inside and harder on the outside. Therefore, the inside of the edge 2 is shaken greatly, and the effect of causing the diaphragm to move as a piston cannot be expected to be very great.

Furthermore, the stiffness of the outer periphery of the edge 2 is different between the part with the rib 3 and the part without it, which causes problems such as peeling off the adhesive at the outer end 3b of the rib 3, causing edge chatter. It was hot.

Therefore, this idea aims to provide a diaphragm that has equal flexibility at both inner ends of the edges that support the diaphragm.To achieve this, the shape of the ribs is such that the inner ends are along the tangential direction and the outer edges are tangentially aligned. The ends are shaped like an arc that follows the curvature of the fixed edge formed on the outer periphery of the edge, and the height (depth) and width are both maximum at the center of the rib and gradually decrease toward both ends. It is characterized by this.

Next, the configuration of this invention will be described with reference to an embodiment shown in FIG. 3 and subsequent figures. In these figures, the symbol 1
Reference numeral 1 denotes a diaphragm which is circular in plan view and has a partially spherical surface, and the periphery of this diaphragm 11 is donut-shaped and forms an edge 12 having a partially spherical surface. This edge 12 has a flat inner circumferential edge 12a and a flat outer circumferential edge that serves as a fixed edge 12b for fixing to a frame or the like.

A plurality of ribs 13 having cross-sectional shapes such as V and U are formed regularly on the spherical portion of the edge 12 at equal intervals. Near the peripheral edge 12a, there is a straight line part 13a along a tangent to the circle drawn by the inner peripheral edge 12a, and an asymptote part 13b which is an arc that gently touches the circle drawn by the fixed edge 12b.
It is composed of.

Further, in this rib 13, the continuous part between the straight line part 13a and the asymptote part 13b becomes the apex R, and the depth of the rib becomes deep and the width becomes large, and the depth increases toward both ends. Both widths are gradually decreasing.

Also, the diaphragm shown in Figures 5 and 6 is Edge 1.
The spherical surface of No. 2 is not a single spherical surface, but has different curvatures on the outside and inside, and the radius of curvature of the outside spherical surface is smaller than that of the inside spherical surface.

A rib 13 is formed on the edge 12 as in the first embodiment, and this rib 13 also has a straight line part 13a and an asymptote part 13b that is asymptotic toward the fixed edge 12b. The part is the deepest and the width is also increasing.

In the sound reproducing diaphragm of this invention, the portion of the rib 13 formed on the edge 12 near the inner periphery is located at the inner periphery 1.
2a is a straight line portion 13a along the tangent line of the fixed portion 1.
The part closer to 2b follows the shape of the arc that touches this, and the rib strength is greatest at the top R of the rib 13, and the rib strength decreases as it gets closer to the end, so from the top to both ends. The distance between the ribs can be set equally, and the flexibility can be freely selected by selecting the depth and width of the ribs.

In the above embodiments, the diaphragm of a speaker was taken as an example, but the diaphragm of this invention can also be applied as a diaphragm of a microphone.

As is clear from the above explanation, the ribs formed on the edges of the sound reproducing diaphragm of this invention can have approximately equal flexibility on the inside and outside of the top. The bending strength of the diaphragm is uniform, the diaphragm can be reliably piston-moved, and localized loads are not generated at the fixed edge of the edge.

[Brief explanation of the drawing]

1 and 2 are a partial plan view and a sectional view of a conventionally well-known diaphragm, FIG. 3 is a plan view of a diaphragm according to this invention, FIG. 4 is a sectional view of the same, and FIG. 5 is another one. FIG. 6 is a plan view of the diaphragm according to the embodiment, and FIG. 6 is a sectional view thereof. 11... Vibration plate, 12... Edge, 12a...
Inner peripheral edge, 12b... Fixed edge, 13... Rib, 13
a... Straight line part, 13b... Asymptote part.

Claims (1)

[Scope of utility model registration request] In a sound reproducing diaphragm in which an edge with tangential ribs is integrally formed on the periphery of a diaphragm that is circular in plan view, the tangential ribs are V-shaped or U-shaped in cross section, and have a similar shape to this, with the inner end The rib is along the connecting direction of the diaphragm, and the outer end is in contact with the inner side of the fixed edge of the edge, and the rib has the maximum width and height at the center and gradually decreases toward both ends. A diaphragm for sound reproduction characterized by having a configuration in which: