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JPH04326298

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DESCRIPTION JPH04326298
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker diaphragm for use in various audio equipment.
[0002]
BACKGROUND OF THE INVENTION The edge base material of a conventional speaker diaphragm
is fixed as a fixed edge made of natural pulp integrated with the diaphragm main body, or as a
free edge used by bonding with the diaphragm main body. A material obtained by molding a
cotton-based cloth coated with a rubber-based resin such as SBR or NBR, or a material obtained
by molding a urethane foam sheet has been used.
[0003]
A typical representative edge of the prior art will be described with reference to the drawings.
FIG. 4 shows the structure of a conventional base fabric made of cotton 1 impregnated with a
thermosetting resin 2 such as a phenolic resin and heat-formed.
[0004]
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However, in the above-described conventional configuration, in the fixed edge made of natural
pulp integrated with the diaphragm main body, it is difficult to take amplitude because it is an
integrated structure. It is unreliable because it has high strength, low strength, and easily cracks
at the edges. In addition, there is a limit in lowering the lowest resonance frequency (fo), and
bass reproduction is difficult.
[0005]
Further, in the free edge used by bonding to the diaphragm main body, a cotton base fabric 1
coated with a rubber-based resin such as SBR or NBR as a sealing material is impregnated with a
phenol resin 2 as a thermosetting resin. After that, the pressure molding is performed at a
temperature of about 200 ° C. However, the cotton base fabric 1 itself is inferior in heat
resistance, and the physical strength of the cotton base fabric 1 is obtained by performing this
heat and pressure molding. In addition, the bonding strength between the warp and weft of the
cotton substrate 1 is deteriorated due to vibration or bending because the cotton substrate 1 and
the phenol resin 2 are not compatible with each other.
[0006]
That is, the linearity with respect to the speaker input is poor, the decreasing rate of the lowest
resonance frequency (fo) is large at high input resistance, and the physical strength is weak at
the edge formed of the urethane foam sheet There were still many issues to be solved in terms of
sexuality.
[0007]
The present invention solves the above-mentioned conventional problems, has high physical
strength, is excellent in heat and humidity resistance and weather resistance, is excellent in
linearity with respect to the speaker input, and has a minimum resonance frequency (fo) at high
input resistance. It is an object of the present invention to provide a speaker diaphragm having a
highly reliable edge with a small reduction rate.
[0008]
[Means for Solving the Problems] In order to solve the above problems, the diaphragm for a
speaker according to the present invention comprises a phenolic resin fiber having excellent heat
resistance and a heat resistant fiber (aromatic polyamide fiber, imide carbon An edge formed by
impregnating a thermosetting resin into a base fabric composed of fibers based on glass, fibers of
glass fiber, etc. and fibers used alone or in mixture of two or more types, and coating with a
rubber resin as a filler A material is joined to the peripheral portion of the diaphragm main body
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to constitute a speaker diaphragm.
[0009]
[Functions] The edge of the speaker diaphragm thus configured does not deteriorate in physical
strength even by heat and pressure molding at a temperature of 200 ° C., and the compatibility
between the base cloth and the phenol resin is Since the bond strength between the warp and
weft of the base fabric is strong against vibration and bending for good, the linearity with respect
to the speaker input is good, and the reduction rate of the lowest resonance frequency (fo) at
high input resistance is very small. A speaker diaphragm having an edge with excellent reliability
can be obtained.
[0010]
DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will
be described below with reference to the drawings.
[0011]
FIG. 1 is a half sectional view showing a speaker using a speaker diaphragm according to the
present invention, and in FIG. 1, 3 indicates a field portion, and this field portion 3 is a lower
plate provided with a center pole 4 5, a ring-shaped magnet 6 and a ring-shaped upper plate 7 as
well.
[0012]
Although the field section 3 shown here is called an external magnet type, it is called an internal
magnet type in which a columnar magnet is incorporated in a saddle type yoke. It may be a field
section.
[0013]
A frame 8 is connected to the field portion 3, and a diaphragm 11 according to the present
invention having an edge member 9 connected to the peripheral portion of the diaphragm body
10 is connected to the peripheral portion of the frame 8. ing.
A dust cap 12 is attached to the upper surface of the central portion of the diaphragm 11, and a
voice coil 13 is coupled to the lower surface of the central portion of the diaphragm 11. The
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intermediate portion is supported by a damper 15 so as to be engaged with each other without
being eccentric to 14.
[0014]
The edge material 9 is made of a phenolic resin based on a blend of heat resistant fibers 17
mainly composed of phenolic resin fibers 16 having excellent heat resistance as shown in FIG. 2
as a base fabric. And the like are impregnated with the thermosetting resin 18 and heat-molded.
[0015]
The chemical structures of the phenolic resin 18 and the phenolic resin fiber 16 are similar to
each other, and the contact is firmly bonded to the back of the warp and weft by the chemical
reaction as shown in chemical formula 1 at the time of heat molding. , Has excellent performance
against vibration and bending.
[0016]
Embedded image
[0017]
As a result, the speaker using the diaphragm 11 in which the edge member 9 is coupled to the
peripheral portion of the diaphragm body 10 has good linearity with respect to the input, and the
reduction rate of the lowest resonance frequency (fo) at high input resistance. The speaker
diaphragm 11 has a very low reliability edge material 9.
[0018]
A comparison of the reduction rate of the lowest resonance frequency (fo) of the speaker using
the speaker diaphragm 11 according to the present invention and the conventional speaker
diaphragm is shown in Table 1 below.
[0019]
[Table 1]
[0020]
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A comparison of the strength retention of the edge material 9 used for the speaker diaphragm 11
according to the present invention and the edge material used for the conventional speaker
diaphragm is shown in Table 2 below.
This shows the result of the reliability of the substrate of the edge material 9 impregnated with
the thermosetting resin 18 such as phenol resin and heated and molded, and the heat resistant
fiber 17 is an aromatic polyamide fiber, These heat resistant fibers 17 can be used according to
the purpose, using imide carbon fibers, glass fibers, etc. singly or in combination of two or more.
[0021]
[Table 2]
[0022]
Further, a comparison of the linearity between the edge material 9 used for the speaker
diaphragm 11 according to the present invention and the edge material used for the
conventional speaker diaphragm is shown in FIG.
[0023]
Also, comparisons of yarn elongation of blended yarn of the edge material 9 used for the speaker
diaphragm 11 according to the present invention and cotton yarn of the edge material used for
the conventional speaker diaphragm are shown in Table 3 .
[0024]
[Table 3]
[0025]
As described above, in the present invention, since the yarn having excellent elongation is used,
deep drawing becomes possible, and it is possible to endure large amplitude sufficiently, and it is
made the edge material 9 most suitable for a speaker for large input. be able to.
[0026]
As described above, the speaker using the speaker diaphragm 11 according to the present
invention has high strength retention against heat and uses a thread with excellent elongation,
which enables deep drawing. For speakers with a highly reliable edge material 9 that can
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withstand large amplitudes well, has good linearity with respect to the speaker input, and has a
very low reduction rate of the lowest resonance frequency (fo) at high input resistance There is
an effect that the diaphragm 11 can be obtained, etc., and the industrial value is great.
[0027]
Brief description of the drawings
[0028]
1 is a half sectional view showing a speaker using a speaker diaphragm according to one
embodiment of the present invention
[0029]
Fig. 2 An enlarged sectional view of an essential part of mixed spinning of an edge material used
for a speaker diaphragm according to the same embodiment.
[0030]
Fig. 3 Linearity characteristics showing the comparison between the edge material used for the
speaker diaphragm according to the same embodiment and the conventional product Fig. 4 The
heat molding of both phenolic resin and cotton fiber of the edge material used for the
conventional speaker diaphragm Main part enlarged sectional view showing the state of
[0031]
Explanation of sign
[0032]
DESCRIPTION OF SYMBOLS 3 field part 4 center pole 5 lower plate 6 magnet 7 upper plate 8
frame 9 edge material 10 diaphragm main body 11 diaphragm 12 dust cap 13 voice coil 14
magnetic gap 15 damper 16 phenolic resin fiber 17 heat resistant fiber 18 phenol type resin
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