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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electroacoustic transducer, that is, a diaphragm and a dust cap of a speaker.
2. Description of the Related Art In the case of a conventional electro-acoustic transducer made
of wood pulp as a representative physical property of a speaker diaphragm, the density is 0.485
and the Young's modulus is 1.17 × 10 10 dyne / cm 2. , The internal loss is 0.0714.
Although many materials have conventionally been developed for the speaker diaphragm, the
ideal conditions for this are: (1) low density, (2) high rigidity, (3) internal loss Is large, etc.
As a result, conventionally, materials incorporating high rigidity materials such as carbon fibers
and aramid fibers and materials having a large internal loss such as polypropylene have been
However, when trying to increase the rigidity of the speaker diaphragm, the internal loss
decreases, and a large peak is generated in the high region in frequency characteristics.
Further, in order to obtain a large internal loss, there is a tendency that the rigidity is lowered
and the density is increased.
Therefore, balancing these three elements in a high dimension is an important goal of making a
diaphragm (corn paper).
For example, in the case of aluminum, the density is 2.7, the Young's modulus is 62 × 10 10
dyne / cm 2, the internal loss is 0.002, and in the case of polypropylene, the density is 0.91, the
Young's modulus is 1. 08 × 10 10 dyne / cm 2, the internal loss is 0.07
SUMMARY OF THE INVENTION The electroacoustic transducer of the present invention is
characterized in that a resin layer is formed by applying a polyolefin polyol resin to a speaker
diaphragm and a speaker dust cap, and has high rigidity. And, a diaphragm with a high internal
loss is obtained to help improve the performance.
[Operation] The electroacoustic transducer according to the present invention suppresses the
decrease in rigidity and the increase in density by applying a polyolefin polyol resin that absorbs
vibration on the front or back of the speaker diaphragm and the speaker dust cap. The internal
loss can be improved.
Embodiments of the electroacoustic transducer of the present invention will be described with
reference to the drawings.
In FIG. 1, reference numeral 1 denotes a support plate having a center pole 2 projecting from the
center of the upper surface, on which the magnet 3 and the upper plate 4 are sequentially
mounted and fixed.
A voice coil 5 is loosely fitted to the upper portion of the center pole 2 and supported by the
frame 7 via the damper 6.
The upper portion of the voice coil 5 is attached to the inner peripheral edge 9 of the coneshaped diaphragm 8 and is connected to the frame 7 through a ring-shaped edge 11 attached to
the outer peripheral edge 10 of the diaphragm 8.
Reference numeral 12 denotes a dome-shaped dustproof cap which is located above the voice
coil 5 and mounted in the vicinity of the inner peripheral edge 9 of the diaphragm 8.
The diaphragm 8 is, as shown in FIG. 2, a polyolefin polyol resin having a thickness of 0.3 mm
and a thickness of 0.3 mm on the front surface of a substrate 13 of 0.5 mm thickness and 120
mm diameter made of ordinary wood pulp. Is applied to form a resin layer 14
According to the bass speaker which is an electroacoustic transducer in which the diaphragm 8
having the above-described configuration is implemented, as shown in the sound pressure
frequency characteristic diagram shown in FIG. The peak shown by the solid line A in the vicinity
of the high frequency reproduction limit frequency by the acoustic converter becomes flat as
shown by the broken line B. In the case of a paper diaphragm, the internal loss can be improved
to about 0.2, and the density is 0.51, Young's modulus is 1.2 × 10 10 dyne / c.
Also, a 0.5 mm thick, 50 mm aperture, paper-made ordinary wood pulp material, with a domeshaped 20 mm aperture, 0.3 mm thick dustproof cap at the front center of the substrate (not
shown) According to the high-tone speaker in which the resin layer is formed by applying a
polyolefin polyol resin to a thickness of 0.15 mm on the front surface, as shown in the sound
pressure frequency characteristic diagram shown in FIG. A peak indicated by a solid line C in the
vicinity of a high frequency reproduction limit frequency by the same type of electroacoustic
transducer is flat as indicated by a broken line D. It is a matter of course that the abovementioned polyolefin polyol resin can be applied to the cone-shaped diaphragm in the case of a
high-sound speaker to improve the characteristics, but it is more effective to apply it to a
dustproof cap.
The application of the resin to the diaphragm and the dustproof cap does not change much in the
characteristics even on the front surface, the rear surface or both. Further, the method of
applying the resin is not limited to brushing, spraying, dipping and the like.
In the embodiments of the present invention, the cone-shaped diaphragm and the dome-shaped
dustproof cap have been described, but the present invention is not limited thereto.
According to the electro-acoustic transducer of the present invention, it is possible to suppress
the peak near the high frequency reproduction limit frequency as in the prior art.
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