JPS584392Y2 - Loudspeaker diaphragm - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to the structure of a diaphragm for a loudspeaker.

Conventionally, paper fiber diaphragms are generally used as materials with large internal losses for dome-shaped or truncated cone-shaped loudspeaker diaphragms, but in order to increase the internal loss required for loudspeaker diaphragms, For example, the Young's modulus of the diaphragm itself decreases, resulting in insufficient high-frequency extension in the frequency characteristics of the loudspeaker.

In addition, in order to give a damping effect to the diaphragm, a damping layer is formed by applying an adhesive substance to the surface of the diaphragm, or by pasting a thin plate of resin shaped into a dome or truncated cone shape with another adhesive. However, in this case, it adds unnecessary mass to the diaphragm, reducing the efficiency of the loudspeaker.If an adhesive substance is applied, the adhesive substance oxidizes over time, causing this damping effect to deteriorate. There is a drawback that the effect deteriorates.

When pasting a thin plate of resin, there is a drawback that vibration loss is small.

This invention was devised to eliminate the above drawbacks.
To explain this with respect to the embodiment shown in the drawings, as shown in Fig. 1, cork grains 3 each having a length of 0.5 to 20 mm and a dilute solution of an adhesive 4 such as vinyl acetate or synthetic rubber are used. This is a diaphragm for a loudspeaker, in which a fluid containing a mixture of the following is sprayed or applied to the back surface, surface, or both surfaces of a fibrous diaphragm 1 formed into a dome shape or a truncated cone shape.

FIG. 2 is a partial cross-sectional view of the same. Since the cork grains 3 are closely packed on the surface of the fibrous diaphragm 1 and are fixed with the adhesive 4, a cork layer 2 is formed on the surface of the fibrous diaphragm 1. to make.

The diaphragm manufactured in this way has a small increase in weight due to the high Young's modulus of the fiber diaphragm 1 and the low specific gravity of the cork layer 2, and the high vibration loss absorbs harmful vibrations in the high frequency range. As a result, a diaphragm for a loudspeaker having good frequency characteristics over a wide frequency band can be obtained.

The density of the cork grains 3 is 0.15 to 0.30 g/cm3, which is smaller than the density of the thin plate resin, 1.0 to 1.5 g/crn3.

The vibration loss of the cork layer 2 is larger than the vibration loss of the thin resin sheet.

As described above, the present invention uses an ingenious method of fixing the lightweight cork layer 2 with high vibration loss to the back surface, surface, or both surfaces of the fibrous diaphragm 1 with a high Young's modulus using an adhesive. In addition to maintaining a high Young's modulus,
To provide a diaphragm for a loudspeaker that is lightweight and produces high vibration loss.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a diaphragm for a loudspeaker according to the present invention, and FIG. 2 is a partial cross-sectional view of the diaphragm according to the present invention. 1 is a diaphragm, 2 is a cork layer, 3 is a cork grain, and 4 is an adhesive.

Claims (1)

[Scope of utility model registration request] A diaphragm for a loudspeaker, in which a fluid obtained by mixing cork grains 3 with a density of 0.15 to 0.30 g 7 cm3 and an adhesive 4 is sprayed or applied to the back, surface, or both surfaces of a molded fibrous diaphragm 1. .