JPS622869Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an edge for a flat diaphragm, and more specifically, to an edge suitable for suspension of a rectangular flat diaphragm.

Edges do not interfere with the piston movement of the diaphragm, and have the function of holding the diaphragm in a normal position relative to the speaker frame.
Roll type edges are most commonly used. That is, although FIG. 1 shows three suspension states of the plane diaphragm, all of these edges are roll edges, and in FIG. It protrudes from the back side of the flange 1b of edge 1.
is fixed to the front side of the diaphragm 2, and FIG. 1B schematically shows the flange 1b fixed to the back side of the diaphragm 2. Further, in FIG. 1C, the flange 1b of the roll edge 1 is fixed to the side surface of the diaphragm 2, and the roll portion 1a protrudes from the front side of the diaphragm 1.

In particular, when the plane diaphragm is square, the corners,
The so-called edge structure of the four corners has many problems, and if only the four corners have greater rigidity than the other parts, it will hinder the piston movement of the diaphragm, so separate members are used only at the four corners. A device with its surroundings closed is used. For example, FIGS. 2A and 2B and FIG. 3 show a case in which, except for edges 1 corresponding to the four corners, those portions are closed with corner members 3 made of a viscoelastic material. There is.

In the edge shown in Fig. 1, the surface of the diaphragm is not completely flat, so a front chamber effect occurs and the frequency characteristics are disturbed. Although the surface becomes flat, since there is an adhesive part between the edge 1 and the corner member 3, durability becomes a problem when driven at high output for a long period of time. Furthermore, the adhesion work is extremely troublesome in terms of assembly work.

Therefore, the direct purpose of this invention was to solve the problems of the conventional edges mentioned above, and for that purpose, we created an edge with a shape and size that corresponds to the periphery of the rectangular diaphragm using urethane foam, etc. It is formed by pressing, and grooves are provided at the edges parallel to the straight parts of the diaphragm, and grooves are provided at the four corners on extensions of the diagonal lines of the diaphragm, and the grooves are formed in parallel to the grooves at the four corners. This is characterized in that both ends of the groove are in communication.

Below, the fourth drawing of the attached embodiment of this invention is shown.
6 to 6 will be explained. First, in the figure, reference numeral 11 indicates a square planar diaphragm, and edges 12 are arranged along the periphery of this planar diaphragm 11 and supported by a speaker frame 13.

This edge 12 is continuous along the entire circumference of the flat diaphragm 11, and is obtained by pressing a urethane foam using a pair of upper and lower molds, and the slit-like grooves 14 and 15 are also formed at the same time. Flange portions 12a, 1 extend along each side of the flat diaphragm and extend along the speaker frame 13.
2b is also formed at the same time, and the portion sandwiched between the two flange portions is an edge portion 12c having a flat front side and an arcuate cross-sectional shape on the back side.
This edge portion 12c has a slit-shaped groove 14 along the length direction and at the center, and at the corner portion of the edge 12c, the slit-shaped groove 14 is formed on the diagonal line extension of the flat diaphragm 11. A wider groove 15 is provided, and both ends of the slit-shaped groove 14 are in communication with the groove 15.

As described above, the edge of this invention is integrally formed by pressing a material such as urethane foam, and the edge portion 12c is provided with a flat diaphragm 1.
A groove 14 is formed parallel to each side of the edge part 12c, and in particular, a groove 15 is formed at the corner part of the edge part 12c along an extension of the diagonal line of the flat diaphragm, thereby reducing the flexibility of the edge. Since the slit-like grooves 14 and 15 are formed by pressing with a mold, the material at the bottom is dense and prevents air leakage.

In the above explanation, a square diaphragm was explained, but the shape of the diaphragm may be any polygon. For example, in the case of a pentagon, the corners are formed on the radial line connecting the center and the corner, and the diaphragm is formed with grooves. 15 is formed on that ray.

As is clear from the above explanation, the edges of this invention are continuous along the circumference of the planar diaphragm and have an edge portion with a flat surface and flange portions on both sides of the edge portion. A slit-like groove is formed along each side of the plate, and a groove is provided at the corner of the edge part on the extension line of the plane diaphragm's radiation, and both ends of the groove are formed in the groove at the corner. Because the edges are connected, the front side of the edge is flat and does not create a vestibule effect, and the edge is straight and the corners maintain sufficient flexibility. No processing such as embedding is required, and it can also contribute to improving the appearance of the speaker unit.

[Brief explanation of the drawing]

Figures 1 to 3 are explanatory diagrams showing conventionally known edges for flat diaphragms, Figure 4 is a partial plan view of the edge according to this invention, and Figure 5 is an enlarged view along the line of Figure 4. Cross-sectional view, Figure 6 is Figure 4-
FIG. 3 is an enlarged cross-sectional view taken along the line. 11...Plane diaphragm, 12...Edge, 12
a, 12b...flange portion, 13...speaker frame, 14, 15...concave groove, 14a, 15a...
…bottom.

Claims (1)

[Scope of utility model registration request] It is integrally molded continuously around the periphery of the rectangular flat diaphragm, and has a roll part that protrudes to the back side and is flat on the front side. A slit-shaped groove parallel to the diaphragm is provided, a groove is formed at the corner on an extension line of the radiation of the plane diaphragm, and both ends of the slit-shaped groove are communicated with the groove provided at the corner. An edge for flat diaphragms characterized by: