JPS5837185Y2 - vibrating body - Google Patents

Description

[Detailed Description of the Invention] The present invention particularly relates to the structure of a vibrating body that is most suitable for use in a planar speaker.

Figure 1 shows an example of a conventional flat speaker.
, 2 is a skin made of aluminum foil or the like, 3 is a core made of aluminum or the like in a honeycomb shape, 4 is an edge, 5 is a frame, 6 is a voice coil, and 7 is a bobbin.

In such a planar speaker, the materials of the skins 1 and 2 and the adhesive that joins the skins 1 and 2 and the core 3 are
This has a significant impact on acoustic and auditory characteristics.

As the skins 1 and 2, a low-density, high-rigidity material with high E/ρ (inelastic strength) such as aluminum foil is used, and as the adhesive, a hard material such as epoxy or acrylic may be used. .

In such a case, the peak of the high resonance frequency color becomes sharp, and the peaks and valleys in front of the peaks become rough, producing audible sound (coloration) unique to the skin material.

In addition to this, the adhesive between the edge 4, the skin 1.2, and the core 3 also has an adverse effect on the frequency characteristics.

The present invention is intended to solve the above problems, and embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 shows the first embodiment, and parts corresponding to those in FIG. 1 are given the same reference numerals.

In this embodiment, as shown in the drawing, an intermediate member 8 is interposed between the skin 1 and the core 3, and the edge 9 is integrally formed by extending the periphery of the intermediate member 8.

As the intermediate member 8, a member having appropriate elasticity and flexibility for supporting the vibrating body on the frame 5 is selected, similar to the edge 4 in FIG.

As an example, prepare an intermediate member material 10 made of urethane foam material with a thickened peripheral edge as shown in FIG. 3A,
This is pressed using the same mold to obtain the intermediate member 8 as shown in FIG. 3B, in which the edge 9 portion is thick and the vibrating portion 8a is thin.

A polyamide-based hot melt adhesive is applied to both sides of the vibrating portion 8a of the intermediate member 8 to a thickness of approximately 10 to 20 μm, and laminated together with the core 3 and the skin 1 by hot pressing.

As another example, cloth such as cotton, silk, or synthetic fiber is formed into a predetermined shape using a thermosetting reinforcing material such as phenol or diallylphthalate.

Next, they are coated or impregnated with a hot-melt or pressure-sensitive damping material/adhesive such as polyamide, olefin, rubber, polyester, etc., and then laminated.

The reason why the vibrating portion 8a of the intermediate member 8 is made thinner than the edge 9 is to reduce the weight, but if this is not necessary, the vibrating portion 8a may be made to have a uniform thickness.

FIG. 4 shows a second embodiment, in which an intermediate member 8 is interposed between the lower skin 2 and the core 3.

In this case, holes 11 are made in the skin 2 and the intermediate member 8,
A bobbin 6 is attached to the core 3.

FIG. 5 shows a third embodiment, in which the core 2 is made of a highly rigid foamed material such as expanded polystyrene.

In the first to third embodiments described above, one of the skins 1 and 2 may be omitted.

As shown in the first to third embodiments described above, the present invention has cores 3 and 12 and skins 1 and 2 that constitute a high-rigidity vibrating body.
Since the lightweight and flexible intermediate member 8, which has a large internal loss, is used between the It is possible to suppress the resonance of m caused by the noise and improve the frequency characteristics in the middle and high ranges.

Further, in the present invention, the intermediate member 8 is interposed between the cores 3, 12 and the skins 1, 2, and the periphery of the intermediate member 8 is formed as the edge portion 9. The vibrations of the flexible intermediate member 8 that occur can be damped by the skins 1 and 2 or the cores 3 and 2 that surround the highly rigid vibrating body.

That is, since the skin has high rigidity with respect to the flexible layer, the two interact with each other to prevent the vibration of the edge from propagating through the flexible layer, and the flexible layer has a high rigidity between the core and the skin. In order to enter, the vibration is produced as sound.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional side view showing an example of a conventional planar speaker.
Fig. 2 is a side sectional view showing the first embodiment of the present invention;
Figures A and B are a perspective view and a side view showing an example of a method for forming an intermediate member, and Figures 4 and 5 are cross-sectional side views showing second and third embodiments of the present invention, respectively. In addition, in the symbols used in the drawings, 1, 2...
・Skin, 3, 12... Core, 8...
Intermediate member, 8a...vibration surface, 9...edge.

Claims (1)

[Scope of utility model registration request] A flexible layer having a predetermined internal loss is provided on the vibration surface of the vibration main body, which is made of a honeycomb-shaped core, a foam core, etc., and whose vibration surface is formed in a flat plate shape, or on a surface substantially parallel to the vibration surface. A vibrating body characterized in that a peripheral portion of the flexible layer is formed as an edge portion, and a low-density and high-rigidity skin member is provided on a portion of the flexible layer other than the edge portion.