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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a 7J
plate, and more particularly to a speaker diaphragm using boron fiber. 2. Description of the
Related Art A diaphragm for a speaker is required to be light in weight, to have a large Young's
modulus, and to have a suitably large 81S loss, and the like. For example, paper, resin, metal and
the like can be mentioned. These substrates are often used as a mixture or composite with other
ones because they have their own disadvantages. For example, in the case of a moving plate
made of paper, glass fibers and / or lagen are mixed into a valve for paper making, and heat
resistance and moisture resistance are whitened, or carbon fibers are mixed to improve A7
coverage and heat resistance. There is something. :;: Tada Tsuyoshi Strengthening Prefecture!
Composite firewood transport plates are also known (-). For example, a diaphragm made of glass
fiber, Kevlar fiber (aromatic polyamide mM), carbon IQH woven and lt4 fat reinforced has been
developed. [Problem Problem to be Solved by the Invention] However, the S-motion board made
of these woven fabrics has four directions perpendicular to the horizontal axis where the taddles,
ko] yarns intersect, and the direction between them. It has four sets of symmetry planes in total,
but it has nod symmetry in the other direction, and the four sets of symmetry planes also have
tensile strength, bending strength, etc. in the intermediate direction of the straight μm direction.
The strength bj is lower, the required elastic modulus is different from that of the diaphragm. For
this reason, two layers are attached by shifting 45 ° with respect to the weaving direction, or
three layers are attached by shifting 30 'each, and the device is made to eliminate the difference
in strength even by a little. However, when two layers and three layers are bonded in this way,
there is a possibility that the direction of 360 ° · directionality does not coincide with the axis of
the pregnancy 01 plate, and that the amount of superposition increases, 6J, medium, medium
And the cost will be increased. Therefore, the present invention is made to eliminate the abovementioned defects 1j1 of the conventional one, so that there is no difference in tensile strength
and bending strength, and the elastic modulus also has no directionality. To prevent the
perturbation, flatten the P i f e level in the high range II, and j (Huff y is thing [] like and σ thing.
(Means for Solving the Problem 1 In order to achieve the purpose of the present invention, in the
speaker diaphragm containing boron fibers, the boron fibers have a modulus of elasticity of not
less than 30,000 kg / ll m 2) 1-1 They are arranged radially, and t, t + A and one = one body (L is
made to be 1 [戊, to be deceived.
[Embodiments] Below, one embodiment of the present invention is shown in the drawings. 1 and
2 which will be described are the cone-shaped speaker diaphragm according to the present
invention (T '而 surface 4 and IJFi surface 14 all 14 ° in FIGS. 1 and 2). In the figure, 1 is a
diaphragm for a speaker made into a shape, and a woven fabric of charcoal 2 M and a resinimpregnated carbon 2 with boro 2 roughly arranged radially along the shape. It consists of three.
This carbon I! It will be the woven fabric 3 of the rattan. The boron OX << t has a tensile strength
of 1 g 300 to 400 kg, 'm + n 2 and an elastic modulus of 30000 to 45000 klJ / mT12. Those
having a physical property of a specific gravity of 2.45 to 2.60 are used. Next, a method of the
speaker diaphragm 1 having the above-described structure, which is a noble method, will be
described with reference to FIGS. 314 and 4. FIG. First of all, as shown in FIG. 3: U, a carbon fiber
fabric 3 impregnated with a resin is heated with gold / S '14 and pressed for forming a base
material of a diaphragm. Next, as shown in FIG. 4, boron fibers 2 are radially disposed along a
cone shape on the mold-formed fabric 3 and a resin is further impregnated on the grooves. The
fabric 3 is arranged, heated and pressed by the mold 4 to form one swing slope 1 for a speaker.
The speaker diaphragm 1 configured in this manner is more sensitive to the directionality of the
carbon fiber fabric due to the influence of the highly elastic boron collar fiber than the composite
in which the boron fiber is overlapped with the carbon IIM fabric on Ill. It can be improved. 1 In
the above example 4: L I +, charcoal impregnated with resin as l '! ! Although the description has
been made using a collar fabric, other materials used as a base material may be paper, resin,
foamed plastic, gold rA or the like. As described above, according to the present invention, boron
fibers are radially disposed at 360 ° in all directions in a pair at the center of the diaphragm;
(Strength strength 1 by integrating into the material! 'T, there is no variation in bending strength,
and the elasticity-I-also has right directionality T, so it is possible to prevent the occurrence of
asymmetric vibration v1 or lowering the pressure level in the high range. .
Brief description of the drawings
1 is a plan view and a sectional view of a speaker diaphragm according to an embodiment of the
present invention, FIG. 2 is a partially enlarged sectional view of FIG. 1, and FIGS. 3 and 4 are
speaker vibrations according to the present invention It is a figure for demonstrating the
manufacturing method of board-.
1 ... speaker diaphragm, 2 ... Bo 1-1 down tM 惟, 3 ... group 4i (textiles), 4 ... 1L Pat I "11
Azukahito Pioneer Attorney Attorney Small Bridge 13 Floating amount Patent attorney Toi 1) 1
Fig. 1 Fig. 2 Fig. 35! J Fig. 4
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