JPS5837181Y2 - Soft dome diaphragm - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a soft dome diaphragm base cloth for a speaker.

Generally, woven or non-woven fabrics made of cotton, silk, synthetic fibers, etc. are used as the base fabric for the soft dome diaphragm of speakers.The base fabric is impregnated with a thermosetting resin such as phenolic resin, and then heated and pressed to form a dome shape. to make a diaphragm.

The diaphragm had a structure in which a viscoelastic resin, such as a silicone resin, was coated on the surface of the diaphragm in order to provide it with flexible elasticity, internal loss, and airtightness.

General silk fibers have the following drawbacks.

Generally, raw silk is spun by letting the silkworms rest four times, so there is a large variation in the thickness of the single fibers.

Raw silk is made by twisting several of these single fibers together.

Most of the sericin that makes up the single fibers of ordinary silk fabrics has been removed.

Furthermore, the composition of the raw silk woven into the fabric is not the same in terms of length and width, for example, the warp is 100 single fibers and the weft is 90.

Also, there is a large variation in the thickness of the twisted yarn, and a large variation in the thickness of the woven fabric.

Weave is not uniform.

Therefore, when this fabric is used as a base fabric and molded with a heating mold, the difference in longitudinal and lateral tensile strength causes deformation of the diaphragm.

Silk material is extremely soft and when molded into a soft dome diaphragm, the concentration of impregnated resin must be increased.

When the amount of impregnated resin is increased, silk loses its original elasticity,
The performance is almost the same as a diaphragm made of cotton or other material.

The present invention has been devised to eliminate the above-mentioned drawbacks and fully utilize the inherent characteristics of silk.

In the present invention, the silkworms are allowed to rest three times before being spun, so that the single silk fibers become extremely fine, uniform fibers and elastic fibers.

This single fiber is composed of 76% fibroin and 24% sericin.

Only a small amount of the sericin content contained in this single fiber is removed, that is, it is refined to reduce the sericin content to 22%.
For example, 97 such single fibers are twisted to make one raw silk.

Next, when weaving on silk, if it is woven immediately after passing through the steam bath, the first
As shown in Figure 2, sericin melts and adheres,
When cooled, it is fixed in that state, so the degree of adhesion of the weave at the intersection 3 between the warp threads 1 and the weft threads 2 becomes stronger.

When the silk fabric produced by this method is used as a base fabric for a soft dome diaphragm, there is little variation in the thickness of the fabric because the single fibers are thin and uniform.

The texture is uniform and elastic. When comparing the conventional silk fabric and the silk fabric of the present invention, there are the following differences.

In conventional silk fabrics, the warp and weft threads simply intersect, but in the silk fabric of the present invention, the sericin is melted, resulting in a bolted cross (tightness intersects) as shown in Figure 2.

For this reason, when a single fiber is taken out from the fabric, conventional fibers are straight and soft, but the fibers of this invention have a curled shape.
Elastic fibers are extracted.

The thickness of conventional silk fabric varies from 0°09 to 0.12 mm, but the thickness of the silk fabric of this invention is 0.10 to 0.11 m.
There is little variation in m.

The weave is similar to that of conventional silk fabric, where the warp is made up of 100 single fibers and the weft is made up of 90 single fibers.
Although the weaving and weaving ratios are not the same, the silk fabric of the present invention has, for example, warp,
The 97 weft threads are the same.

Compared to traditional silk fabrics, which are flexible and very soft,
The silk fabric of this invention is highly elastic.

This silk fabric of the present invention is impregnated with an 8% phenol impregnating solution, and after volatilizing the solvent, it is molded in a heated mold to obtain a soft dome diaphragm.

A speaker with a soft dome diaphragm made using this method has a small amount of resin impregnated, so the diaphragm is light and the sound pressure can be increased by 1 dB.

The soft dome diaphragm has elasticity and produces little rattling distortion.

It also has the effect of making rolling less likely to occur.

As mentioned above, the present invention consists of twisting single silk fibers made by letting silkworms rest three times and spinning them together in the vertical and horizontal directions, making them uniform fibers and giving them elasticity. The sericin is refined by removing only a small amount of its content, and the sericin is melted through a steam bath just before being woven into silk.
The base fabric of the soft dome diaphragm is made of silk fabric with a strong weave at the intersections of raw silk.

The base fabric of this invention has elasticity, so it only needs to be impregnated with a thin concentration of phenolic resin impregnating liquid.It does not lose the original elasticity of silk and is light in weight, so it can improve sound pressure and improve various acoustic properties. Therefore, we provide a high quality soft dome diaphragm.

[Brief explanation of the drawing]

FIG. 1 is an enlarged plan view of the base fabric of the diaphragm of the present invention, and FIG. 2 is an enlarged sectional view of the base fabric of the diaphragm of the present invention. 1 is the warp, 2 is the weft, and 3 is the intersection.

Claims (1)

[Scope of utility model registration request] Silk fibers with a high content of sericin are twisted in the same number to form warp 1 and weft 2, and the warp 1 and weft 2 are woven immediately after passing through steam to intersect the warp 1 and weft 2. A soft dome diaphragm is formed by heating and pressing a base fabric on which part 3 is adhesively fixed with the sericin and forming it into a dome shape.