JPH01282997A - Diaphragm for speaker - Google Patents

Abstract

PURPOSE:To give beautiful gloss to the surface of a diaphragm for a speaker, to improve Young's modulus, and to improve characteristics as the speaker by arranging crystals to form the surface gloss by an optical regular reflecting phenomenon in a transparent layer provided on a frontal surface. CONSTITUTION:The crystals of a pearl pigment 3 are arranged in parallel in a vehicle 2 formed on the surface of the diaphragm for a cone type speaker. Incident light beam from the surface is reflected on the surface of the crystals of the pearl pigment 3, reaches other crystals of the pearl pigment 3, reflected on the surface of the crystals of the pearl pigment 3 again, and made into a multiple reflected state. For the pearl pigment 3, for example, titanium oxide coated mica, etc., can be used.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to a vibration-generating member that is located in a magnetic gap and that, when a signal current flows therethrough, transmits vibrations of a vibrating member that generates vibrations having the same waveform as the signal current. , relates to an improvement of a speaker diaphragm for propagating this vibration into the air.

[Conventional technology]

In general, the characteristics of speaker diaphragms include good output sound pressure frequency characteristics over a wide range, etc.
It is lightweight, has a high Young's modulus, has a low density, and has a moderate acoustic internal loss.

Recently, with the increase in car door mounting and outdoor use, the diaphragm installed on the front of the speaker has more opportunities to be seen by listeners, and the aesthetic appearance of the diaphragm has become more important. I came.

In order to meet these expectations, we laminated a thermoplastic resin film on the front of the diaphragm or sprayed a glossy resin paint, dried and hardened it to form a film, which made it visible to the listener. Some speakers have a glossy front surface on their diaphragm.

[Problem to be solved by the invention]

However, when a thermoplastic resin film is laminated and bonded, it is not possible to obtain a uniform surface gloss because it involves melting, and this cannot be done for a diaphragm made of a thermoplastic resin such as polypropylene.

Also, when spraying glossy resin paint,
If the paint is sprayed until it exhibits sufficient gloss, the thickness of the film will increase, the weight of the diaphragm will increase significantly, and the characteristics of the speaker will deteriorate.

As described above, in the past, the beautiful gloss of the diaphragm surface and the physical properties were contradictory, and there was a drawback that it was impossible to satisfy both at the same time.

(Object of the Invention) The present invention solves the problems associated with the glossing of conventional speaker diaphragms, and provides a speaker diaphragm that can be expected to have beautiful gloss on its surface and improve its characteristics as a speaker. The purpose is to

[Means for Solving the Problems] The present invention relates to a speaker diaphragm for achieving the above-mentioned object, and the present invention is directed to a speaker diaphragm in which a crystal exhibiting an optical effect that causes a regular reflection phenomenon is placed on the front surface of the speaker diaphragm or over the entire speaker diaphragm. They are arranged in a transparent layer.

[Embodiments of the invention]

In the present invention, the regular reflection phenomenon is obtained, for example, by arranging pearl pigment crystals in parallel.

That is, for a cone-shaped speaker diaphragm 1 shown in FIG. 2, a color vehicle 2 formed on the surface of the diaphragm 1 as shown in FIG.
The crystals of the pearl pigment 3 are arranged in parallel inside the diaphragm 1, or the crystals of the pearl pigment 3 are arranged in parallel inside the diaphragm 1 as shown in FIG.

Next, as an embodiment of the present invention, a color vehicle 2 in which crystals of a pearl pigment 3 are arranged in parallel on the surface of the diaphragm 1 shown in FIG.
We will explain the case of forming .

The diaphragm l of this example uses unbleached coniferous kraft pulp as the natural fiber, and is beaten to a beating degree of 20°.
A paper stock adjusted to SR (Shopper ligner) level is used, but it may also be made from natural fibers or synthetic fibers, which have conventionally been widely used as raw materials for the diaphragm 1.

After dispersing the paper material in water in a papermaking tank and forming it into the desired shape of the diaphragm 1, the paper stock was heated at a temperature of 180°C and a press pressure of 3.
．． The diaphragm 1 is pressurized at about 0 kg/Cl11, heated, and dried to obtain a diaphragm 1 having a smooth surface.

Next, as a pearl paint, the coverage rate of titanium oxide is 50
100 parts of an acrylic resin-based clear lacquer is mixed as a color vehicle 2 with 10 parts of a mica pearl pigment 3 having a main particle size of 10 to 60 μm, and mixed by thorough stirring.

This is applied by spraying onto the surface of the diaphragm 1, and during this spraying, the crystals of the pearl pigment 3 are arranged in parallel in the color vehicle 2.

Furthermore, an example in which crystals of pearl pigment 3 are dispersed in parallel within the diaphragm 1 will be described below.

In this example, after adding about 0.2 part of a wetting agent to 100 parts of transparent or translucent polystyrene pellets, tampling was performed for about 5 minutes at a drum rotation speed of 30 to 40 rpm, followed by the pre-treatment. Add 1 part of the same pearl pigment 3 as in the example and tamp it again for about 100 minutes.

Thereafter, indigo molding is performed at a temperature of 180 to 220°C to form a diaphragm 1 in which the pearl pigments 3 are arranged in parallel.

In these embodiments, the layer in which the pearl pigments 3 are arranged in parallel is a transparent layer of acrylic resin-based clear lacquer or polystyrene.

Therefore, the light beam incident from the surface is reflected by the surface of the crystal of the pearl pigment 3, reaches another crystal of the pearl pigment 3, and is reflected by this again, resulting in multiple reflection.

However, the optical properties of the pearl pigment 3 are different from those of ordinary pigments, and since it is composed of many thin transparent layers, a portion of the light is reflected on the surface, and the afterglow repeats the incident effect.

At this time, if the low refractive materials and the high refractive materials are arranged alternately, a pearlescent luster can be obtained in the transparent layer due to the multiple reflections described above.

Since the present invention uses such multiple reflections to create pearlescent luster, there is no need to attach a large amount of resin as in the past.

Furthermore, since the pearl pigment 3 according to the above embodiment is made of mica coated with titanium oxide, it is arranged on the surface of the diaphragm 1 via the acrylic resin clear lacquer as the color vehicle 2.
It can be used as a composite diaphragm and also helps increase the rigidity of the diaphragm.

The following table shows unexposed softwood craft valves with a beating degree of 20°.
Diaphragm I formed of SR, diaphragm ■ of the first embodiment, second diaphragm
Density (g/cffl) of diaphragm (■) in Example, Young's modulus X
1010dyne/c++? , the internal loss Xl0-2 is compared.

As is clear from this table, the Young's modulus is greatly improved despite the small increase in density, and exhibits an excellent value as a characteristic of a speaker diaphragm.

In the first embodiment described above, the pearl paint was sprayed using an air spray gun with a pressure of about 3.0 kg/c++1, but since the pearl paint is non-conductive, it is also suitable for electrostatic painting. This makes it suitable for diaphragms with complex shapes.

Furthermore, since the pearl pigment 3 is alkali resistant, it can also be used as a water-based paint, and can be used even if the diaphragm 1 is made of various materials.

Furthermore, in the above embodiment, mica coated with titanium oxide is used as the pearl pigment 3, but its surface is coated with ZrO.
,,ZnO1Alt03,Co01Sb203,SnO
Color development can also be emphasized by coating with metal oxides such as □, Fc, 03, CuO, Cuz03, etc.

Alternatively, in the manufacturing process of the pearl pigment 3, various textures and glosses can be produced by adjusting the maximum particle size, average particle size, thickness, etc. of mica.

Furthermore, the titanium oxide-coated mica of this example can change its hue to silver, gold, red, purple, blue, and green by increasing the adhesion rate of titanium oxide.

〔Effect of the invention〕

The present invention forms a surface gloss due to a regular reflection phenomenon at least within the transparent surface layer of the front diaphragm like a ridge, and although the increase in weight and density is small, the This significantly improves the ratio and improves the characteristics of the speaker's diaphragm.

Because of this regular reflection phenomenon, the surface becomes pearlescent, so by using it in a speaker whose diaphragm is exposed on the front, the aesthetic sense of the speaker can be improved.

Moreover, since the present invention can be added by spraying or molding, it can be applied to all types of speaker diaphragms and has high industrial value.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of multiple reflection according to the present invention, FIG. 2 is a sectional view of a diaphragm, and FIGS. 3 and 4 are enlarged sectional views of a part thereof. 1... Vibration plate, 2... Color developer, 3... Pearl pigment. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] A diaphragm for a speaker, characterized in that crystals forming a surface gloss by an optical regular reflection phenomenon are arranged in a transparent layer provided at least on the front surface.