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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
diaphragm for emitting sound of a speaker that converts an electrical sound signal current into
mechanical vibration to make it sound. [Prior Art] Generally, physical properties required as a
diaphragm for a speaker are lightweight, high Young's modulus, and low in density in order to
make the output sound pressure frequency characteristics etc. of the speaker better. Reasonable
internal loss is to be obtained. That is, the higher the Young's modulus and the smaller the
density, the higher the resonant frequency of the diaphragm and the wider the piston movement
area, and therefore the wider the frequency range of the speaker, and the larger the internal loss,
the more divided resonance of the diaphragm. The frequency characteristic is flattened by
decreasing. From this point of view, as a diaphragm satisfying the above-mentioned required
physical properties, a diaphragm formed by paper-making of a conventionally beaten natural
fiber, chemical fiber, or a fiber material obtained by mixing these is available. It is widely
manufactured. Since such a diaphragm is manufactured by paper-making, it is weak to moisture
and moisture, and swelling due to absorption of moisture, deterioration of performance and the
like occur. However, recently, the usage of speakers has been expanded, such as outdoor use of
speakers and door mounts for automobiles, and more speakers are exposed to water and
moisture, so the diaphragm itself is required to have return water resistance and water
resistance. Came to be As a conventional method for increasing the water resistance of the
diaphragm itself a, a method of impregnating natural fibers with a thermosetting resin such as
phenol resin or epoxy resin, C using a plastic sheet such as polypropylene, polyethylene or
terephthalate, Methods such as using a metal simple substance such as aluminum or titanium,
coating a synthetic resin etc. on the surface of the diaphragm base material of natural fiber e, or
heating and adsorbing a thermoplastic film such as nylon on the surface of the vibration base
material of natural fiber It was used. However, since the item a has a low internal loss tan δ and
a high density ρ, the thickness of the diaphragm is reduced in order to reduce the weight of the
diaphragm, which causes a peak and a dip on the frequency characteristics. Moreover, although
the thing of said item is excellent in waterproofness, it is easy to produce a deformation |
transformation in about 100 degreeC high temperature atmosphere, and there exists a fault
which becomes expensive. In addition, although the item 0 has a large Young's modulus E, it is
difficult to control the high-frequency resonance because the internal loss tan δ is small, and
there is a limit on the elongation of the material, and the machinability is not only bad. There is a
drawback that the cost is very expensive. In the case of the item d, since the synthetic resin
penetrates the diaphragm base during the synthetic resin application, when the synthetic resin is
applied until sufficient waterproofness is obtained, the Young's modulus E becomes small and the
sound There is a drawback that the output level in the high frequency range of the pressure
frequency characteristic is lowered and the efficiency is deteriorated.
Furthermore, since the thin film causes heat absorption of the thin film on the surface of the
diaphragm base of natural fiber, pinholes are generated and complete waterproofness can not be
imparted, and in particular, the original cone-shaped vibration is generated. It is unsuitable for a
board, and the use of a thick film has a drawback that the speaker sensitivity is lowered. [Object
of the Invention] The present invention is for removing the above-mentioned drawbacks of the
conventional speaker vibration and plate having a waterproof property, eliminating pinholes to
provide complete waterproofness and having good workability. It is an object of the present
invention to provide a speaker diaphragm which is low in cost and which can obtain flat highfrequency characteristics, which is an advantage of a diaphragm mainly composed of natural
fibers. [Summary of the Invention] In order to achieve the above-mentioned object, the present
invention forms a nitrocellulose based resin layer on a natural fiber only or a vibration plate base
material mainly composed of a natural fiber, and a vinyl system on the surface thereof. The point
The present invention will be described in more detail with reference to FIGS. Reference numeral
1a denotes a diaphragm base material, which is formed, for example, of corn paper obtained by
forming a natural fiber or natural fiber as a main component and mixed with synthetic fiber.
Reference numeral 1b denotes a nitrocellulose based resin layer formed on the diaphragm base
1a. For example, a lacquer based resin having good waterproofness, hydrophobicity and good
processability is used. Reference numeral 1c denotes a vinyl resin layer formed on the surface of
the nitrocellulose resin layer 1b. This vinyl resin has high waterproofness, and appropriately has
the flexibility of a film that affects the loss of the diaphragm. In order to manufacture such a
diaphragm 1, firstly, as a first step, a diaphragm base 1a made of a natural fiber is impregnated
or coated with a lacquer resin, and the both sides of the diaphragm base 1a are lacquered resin
Form layer 1b. Next, in the second step, a vinyl-based resin is coated or coated on the surface of
the lacquer-based resin layer 1 b to form a vinyl-based resin File. A water-soluble emulsion type
vinyl resin is suitable for this coating or coating because the lacquer resin layer 1b has a watersaving suitable for coating and coating of a water-soluble resin, and after coating and coating,
The water-soluble emulsion type vinyl resin forms a uniform coating film on the surface without
penetrating into the diaphragm 1a. Next, an embodiment of the present invention and a method
of manufacturing the same will be described. Pulp fibers of UKP 20 ′ ′ SR are made into paper
and molded to form a cone-shaped diaphragm base 1a with a thickness Q, about 5 **, which is
impregnated with a 10% by weight nitrocellulose clear lacquer solution for 1 to 3 minutes The
resultant is dried for about 20 minutes with a warm air of about 80 ° C. to form a nitrocellulosebased clear lacquer layer 1b on the diaphragm substrate 1a.
Next, a water-soluble emulsion type vinylidene chloride resin having a concentration of 40 to
50% by weight is applied to the surface of the clear rough car resin layer 1b. Since this coating is
a water-soluble resin, it can be easily performed with a brush or the like. The diaphragm 1 made
in this way, a diaphragm molded only with UKP 20 ′ ′ SR pulp fibers, and a conventional
diaphragm with 100% plastic polypropylene by weight, density ρ (g / cm), Young's modulus
Physical characteristics such as EX 1010 (dyn / cd), internal loss δ × 102, propagation velocity
i ヲ] × 10 ′ ′ (cm / sec) are compared, and the results are shown in the table below. As
apparent from the above table, the diaphragm 1 of the embodiment is slightly larger than the
diaphragm made of only pulp fibers having a density が of USP 20 ° SR but much smaller than
the diaphragm of polypropylene, and the weight is reduced. Ru. The Young's modulus is also
larger than that of the polypropylene diaphragm. Furthermore, the internal loss is the same as
that of the pulp fiber only, and the propagation speed is also the same. A comparison of the
frequency characteristic A of the speaker using the diaphragm of this embodiment with the
frequency characteristic B of the speaker using the polypropylene diaphragm is shown in FIG.
The frequency characteristic A shows a characteristic closer to the flat frequency characteristic
peculiar to the diaphragm formed of natural fibers than the frequency characteristic B. [Effects of
the Invention] The diaphragm of the present invention has characteristics similar to those of the
pulp fiber diaphragm using physical fibers as described above, and it has a nitrocellulose resin
layer on its surface and a diaphragm substrate. A waterproof, return water layer without pinholes
is formed by the vinyl resin layer formed without penetrating into the village. Therefore, the
diaphragm has a flat sound pressure frequency characteristic similar to that of a pulp fiber
diaphragm using natural fibers despite being waterproof and water-reversible, and also has
excellent surface gloss. Then, unlike a diaphragm made of a single metal, a nitrocellulose resin
layer may be formed on the surface of the diaphragm base, and a vinyl resin layer may be formed
thereon, so that its manufacture and processing are easy. Since the cost is low, it has advantages
such as being able to be provided at low cost.
Brief description of the drawings
1 is a cross-sectional view of an embodiment of the present invention, FIG. 2 is an enlarged view
of the in-circle portion of FIG. 1, and FIG. 3 is a sound pressure frequency comparing this
embodiment with a conventional polypropylene diaphragm. FIG.
DESCRIPTION OF SYMBOLS 1 ... diaphragm, la ... diaphragm base material, 1b ... nitrocellulose
resin layer, 1c ... vinyl resin layer. Patent Assignee Pioneer Corporation Domoto Co. Mogami
Electric Co., Ltd.
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