JPH05284594

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DESCRIPTION JPH05284594
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker diaphragm used for various audio devices.
[0002]
2. Description of the Related Art A conventional loudspeaker of this type has been constructed as
shown in FIG. That is, the frame 6 is coupled to the upper plate 4 of the magnetic circuit 5
constructed by incorporating the ring magnet 3 and the ring upper plate 4 on the lower plate 2
having the center pole 1, and the gasket 6 is The diaphragm 8 is bonded together with the
reference numeral 7, and the voice coil 10 fitted without eccentricity to the magnetic gap 9
formed by the magnetic circuit 5 is coupled to the central portion of the diaphragm 8 The part is
held by the damper 11, and the dust cap 12 is incorporated into the upper surface of the central
portion of the diaphragm 8.
[0003]
Here, as shown in FIGS. 6 (a) and 6 (b), the conventional speaker diaphragm is configured by
bonding the diaphragm main body 14 to the inner peripheral portion of the edge 13 formed in a
wave shape, a roll shape or the like. It was Conventional edge materials are plain weave cotton
woven fabric coated with urethane foam, phenol resin and polymer resin.
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[0004]
Although urethane foam is advantageous in the sound quality of the speaker because of high
internal loss of the material, it is expensive because of the long molding time for molding into an
edge shape, and UV rays and The field which can be used was limited because physical property
deterioration by humidity was intense.
[0005]
Plain weave cotton woven fabric is widely used because of low cost and low physical property
deterioration due to ultraviolet light and humidity, but the material's elongation rate is low and
deformation at large amplitude is large and the speaker's lowest resonance frequency f0 due to
long-term use There was a problem that
For this reason, recently, plain weave meta-based polyamide woven fabric is used as a base
material. Excellent in strength and less in f0 change rate than cotton woven fabric. However,
since the internal loss of the base material is low and the compatibility with the phenol resin is
not good, the distortion is high, and the reduction of the change of f0 can not be suppressed
significantly.
[0006]
An object of the present invention is to provide a speaker diaphragm which eliminates the abovementioned conventional defects and suppresses the decrease of the change of f0.
[0007]
[Means for Solving the Problems] In order to solve the above-mentioned problems, the present
invention uses chemical fibers such as meta-based polyamide fibers or carbon fibers as a base
material, and two yarns each at 60 ° based on one yarn. Using a triaxial fabric woven at
different angles as a base material, and heat-formed one coated with a phenolic resin and a high
internal loss polymer resin into a predetermined shape by bonding to the outer peripheral part of
the diaphragm main body ing.
[0008]
[Function] As described above, in the conventional plain weave, the strength is different between
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the vertical and horizontal directions and the directionality is generated, but the directionality is
lost by making the base material triaxial, and therefore the deformation is It is difficult to do so,
distortion is reduced, and reduction in f0 change is also suppressed.
[0009]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A loudspeaker diaphragm
according to an embodiment of the present invention will be described with reference to the
drawings.
[0010]
FIG. 1 is a half sectional view showing a speaker diaphragm according to an embodiment of the
present invention, and as shown in FIG. 2, three yarns made of chemical fibers such as metabased aromatic polyamide or carbon fiber are respectively used as raw materials The fibers
combined at an angle of 60 ° are used for the edge substrate 15.
This fiber is used as an edge substrate 15, coated with a mixture of 5% by weight of a phenolic
resin for shape retention after molding mixed with a solvent, and coated twice with a
chlorosulfonated polyethylene resin, and then thermoformed. The diaphragm main body 17 was
adhered to the inner peripheral portion of the edge 16 cut into a predetermined shape to
constitute a speaker diaphragm.
[0011]
The sound pressure frequency characteristics of a 16 cm diameter speaker using the speaker
diaphragm of the present invention are shown in FIG.
In particular, the edge resonance at 500 to 2000 Hz is reduced, resulting in a flatter
characteristic.
[0012]
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Next, the transition of the f0 change rate in the time-dependent change of the 16 cm aperture
speaker using the speaker diaphragm of the present invention is shown in FIG.
Compared to the conventional plain weave meta-based aromatic polyamide woven fabric edge,
the decrease in f0 change is small.
The same effect was obtained by using a rubber-based coating agent such as styrene butadiene
rubber or nitrile butadiene rubber instead of chlorosulfonated polyethylene as the coating agent.
[0013]
As described above, since the present invention is configured, it is possible to reduce the edge
resonance and to prevent the decrease of f0, which is a great industrial value.
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