JPS622868Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a suspension for a flat speaker in which the edge portion of the flat speaker is improved.

As shown in Fig. 1, the conventional edge suspension of this type of flat speaker has an edge A with a semicircular cross section, and a flat diaphragm on one side with the circular arc facing upward. A structure in which it is fixed around the periphery of the flat diaphragm B and the other side is fixed to the frame D with a gasket C, or a structure in which the arc part is connected to the periphery of the flat diaphragm B and the frame D with the arc portion facing downward, as shown in Fig. 2. It was hot. However, in the former case, due to the arc portion of edge A protruding from the surface of flat diaphragm B,
Also, the latter has an edge A lower than the surface of the plane diaphragm B.
Due to these recesses, a dip occurs and is disturbed in the sound pressure frequency characteristics, as shown by the solid line in FIG. Furthermore, in both of the structures of the edge A described above, the amplitude linearity of the edge A in the vertical direction is not good, so there is a drawback that amplitude distortion in the low frequency range increases.

Therefore, the present invention aims to solve the above-mentioned drawbacks by making the edge shape vertically symmetrical, thereby minimizing the unevenness on the surface of the plane diaphragm and improving the sound pressure frequency characteristics. To provide a suspension for a flat speaker, which aims to reduce disturbance and improve amplitude linearity in the vertical direction.

Hereinafter, the present invention will be explained based on illustrated embodiments. Figure 3 is a perspective view of the main parts of a flat speaker using the suspension according to the present invention.
B is an explanatory diagram of each operation. In the figure, numeral 1 denotes a planar diaphragm, which has a rectangular shape in plan view, but may have a circular shape, and 1a indicates a peripheral portion of the planar diaphragm 1. Reference numeral 2 denotes an edge, and the edge 2 is formed into the shape shown in the figure using an elastic material such as urethane rubber or butyl rubber having a small stiffness. That is, the planar shape of the edge 2 is a ring shape that matches the planar shape of the planar diaphragm 1. The cross-sectional shape of the edge 2 includes a pair of horizontal parts 2a, 2b spaced apart in parallel by the thickness of the flat diaphragm 1, and both horizontal parts 2a, 2.
a vertical portion 2c connecting one side end of b;
It is composed of a flange portion 2d that protrudes in the opposite direction to the horizontal portions 2a and 2b from the symmetrical position of c.

The peripheral part 1a of the flat diaphragm 1 is inserted and fixed between the horizontal parts 2a and 2b of the edge 2. At this time, the peripheral part 1a and the vertical part 2 of the edge 2 are
peripheral part 1 so that a space part 3 is formed between c.
a needs to be inserted between both horizontal parts 2a and 2b. On the other hand, the flange portion 2d of the edge 2 is fixed to the frame 5 by the gasket 4, but at this time, it is necessary to separate the vertical portion 2c of the edge 2 from the gasket 4 and the frame 5 so as not to contact them.

Next, the operation of the above embodiment will be explained with reference to FIGS. 4A and 4B. As is clear in FIG.
c. The peripheral part 1a of the planar diaphragm 1 forms a parallelogram, and the edges 2 are made of an elastic body with small stiffness, so even when the planar diaphragm 1 vibrates upward, the edges 2 form a parallelogram. Even when it vibrates downward as shown in Figure B, the plane diaphragm 1 always moves in parallel. Also, the horizontal part 2 of edge 2
a and 2b, the unevenness on the front surface of the flat diaphragm 1 is reduced, and as shown by the dotted line in FIG. 5, there is no disturbance in the sound pressure frequency characteristics.

As mentioned above, the present invention uses an elastic body to form a pair of parallel horizontal parts 2a and 2b and both horizontal parts 2 when viewed in cross section.
An edge 2 consisting of a vertical part 2c connecting one side of a and 2b and a flange part 2d protruding from a symmetrical position of the vertical part 2c in a direction opposite to the horizontal parts 2a and 2b.
The peripheral part 1a of the flat diaphragm 1 is clamped and fixed between the horizontal parts 2a and 2b, and the peripheral part 1
Since a space 3 is formed between a and the vertical part 2c, and the flange part 2d is fixed to the frame 5, vertically symmetrical edges 2 improve vertical amplitude linearity and reduce amplitude distortion in the low range. is reduced. Furthermore, the unevenness on the front surface of the flat diaphragm 1 is reduced, and disturbances in the sound pressure frequency characteristics are reduced.

[Brief explanation of the drawing]

1 and 2 are perspective views of main parts showing different embodiments of a planar speaker using a conventional suspension, respectively, and FIG. 3 is a main part of a planar speaker using a suspension according to the present invention. In a perspective view, the fourth
A and B in the figure are respectively explanatory diagrams of the operation, and FIG. 5 shows sound pressure frequency characteristics of the present invention and a conventional example. 1... Plane diaphragm, 1a... Peripheral part, 2... Edge, 2a, 2b... Horizontal part, 2c... Vertical part,
2d...flange part, 3... space part, 5... frame.

Claims (1)

[Scope of utility model registration request] An edge consisting of a pair of parallel horizontal parts in cross-sectional view, a vertical part connecting one side of both horizontal parts by an elastic body, and a flange part protruding from the target position of the vertical parts in the opposite direction to the horizontal parts. The peripheral part of the flat diaphragm is fixed between the two horizontal parts to form a space between the peripheral part and the vertical part, and the flange part is fixed to the frame. Suspension for flat speakers.