JPS6040755B2 - Diaphragm for speaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker diaphragm that is lightweight, has a large internal loss, and is extremely rigid.

Hitherto, speaker diaphragms that are lightweight, have a large internal loss, and have excellent rigidity have been developed having a honeycomb structure or a three-layer structure, but none have been fully satisfactory. For example, speaker diaphragms have been developed that have a honeycomb structure made of metal foil as a core, and surface materials made of metal foil or reinforced plastic sheets are bonded to both surfaces of the core. Since the surface is line-bonded, the bonding strength is extremely small, and the bonding strength is not sufficient, and when it is assembled into a speaker and driven, it tends to peel off, causing abnormal noise and resulting in poor reliability.

In addition, the three-layer speaker diaphragm, which uses metal foil on the surface and foam inside, has a large internal loss and excellent rigidity, but has the disadvantage that it is heavy and becomes inefficient when used as a speaker. It had a The present invention eliminates the drawbacks of the prior art as described above.

Embodiments of the present invention will be described below with reference to FIGS. 1 to 3 of the drawings.

1 is a honeycomb-structured core made of a polyethylene foam sheet or a polyurethane foam sheet, and has a large number of hollow parts 2. As shown in Fig. 2, this core has a continuous cut 3 shaped like a half hexagon. A plurality of hollow parts 2 were formed, and each row of the cuts 3 was formed so as to alternately form cuts 3 in opposite directions, and by pulling this sheet in the vertical direction as shown in FIG. 3, a large number of hollow parts 2 were formed. It is something.

On both sides of this core 1, a surface material 4 made of a highly rigid material such as metal foil such as aluminum or reinforced plastic.
, 5 are attached by adhesive. With this configuration, the adhesion between the core 1 and the surface materials 4 and 5 is performed on a sufficient plane of the core 1, and the adhesion strength is high. It is possible to completely eliminate the occurrence of abnormal sounds caused by peeling off.

Moreover, the density of this speaker diaphragm is 0.8 m/s,
Young's modulus is 7.2×1 and odyn/young, specific elastic modulus is 9.0
× 1 pio (pio/sec) 2, which provides advantages such as being light, having a large internal loss, and being highly rigid.

As described above, the speaker diaphragm of the present invention has many advantages and is of great industrial value.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part showing an embodiment of a speaker diaphragm of the present invention, FIG. 2 is a top view of a main part of the same core in the process of being processed, and FIG. 3 is a top view of a main part of the core. 1... Core, 2... Hollow part, 3... Cut, 4
, 5...Surface material. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. In a speaker diaphragm constructed by attaching surface materials with excellent rigidity to both surfaces of a core with a honeycomb structure, a large number of slits are formed in a resin foam sheet with a large internal loss as the core, and the slits are stretched to form a hollow A speaker diaphragm characterized by using a diaphragm having a large number of parts.