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JPS5450318

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DESCRIPTION JPS5450318
Description 1, title of the invention
Speaker diaphragm
The present invention relates to a speaker diaphragm for a honeycomb structure. Conventionally,
paper or gold-plated material is mainly used as the material of the speaker diaphragm. Especially
for low- and medium-tone diaphragms, the ratio of the diaphragm to the weight of the vibration
system is high, and the paper with low density is used. Is often used. Of course, it is necessary
that the diaphragm of the high-pitched speaker be light in weight, and paper is often used, but
metal materials having a large Young's modulus are also used so that higher frequencies can be
reproduced. However, the following is a necessary condition for the diaphragm of the speaker. 1)
the density ρ is small, 2) the speed of sound J1 is 7 (where E is the Young's modulus), and 3)
having an appropriate internal loss 適当. In the relationship between the diaphragm and the
characteristics of the speaker under these conditions, a small density 軽 く can lighten the
diaphragm, so that the efficiency can be increased and the thickness can be further increased.
And reduction of harmonic distortion can be expected. Further, by increasing the sound velocity
V177, it is possible to expand the piston region of the diaphragm and extend the band, and to
reduce high-frequency distortion largely affected by distortion of the vibration system.
Furthermore, providing an appropriate internal loss η can reduce the peak of high-frequency
resonance on the sound pressure-frequency characteristic of the speaker. Although the
conventional cone paper has a low density and an appropriate internal loss EndPage: 1 loss
under the conditions as such a speaker diaphragm, the BlII rate is 0.1 x 1011 to 0.5 x 10 "(d /
The condition of low 5ec2) and large sound velocity V ′ ′ T77 could not be satisfied. On the
other hand, although a metal diaphragm such as aluminum or titanium has a large V 1 7 but a
large density and a small internal loss, only the condition 2) can be satisfied. According to the
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present invention, the speaker diaphragm has a honeycomb structure so as to satisfy all the
above conditions 1), 2) and 3), and the surface material (skin) constituting the honeycomb
diaphragm is one hundred. is there. Hereinafter, embodiments of the present invention will be
described with reference to the drawings. FIG. 1 shows an example of the honeycomb structure
diaphragm according to the present invention, in which 1 mainly shares bending strength (!
Surface material (skin) of thin and hard materials such as FRP (carbon fiber reinforced plastic)
and GPRP (glass fiber reinforced plastic), 2 supports skin 1 and is made of aluminum foil etc.
with excellent shear strength and light weight A core 1 (core) having a honeycomb shape is
shown, and a skin 1 is attached to both sides of the core 2, and the whole has a cone shape.
The diaphragm with the ニ カ ム 構造 構成 structure configured in this way differs in Young's
modulus, density, and internal loss in the types of fibers and resins that make up the skin 1, and
the type of adhesive that bonds the skin 1 and core 2 Typical values when using 0 FRP or GFRP
for the skin and aluminum for the core are as shown in Table 1. As described above, the
honeycomb structured vibration plate obtains high l / ρ, and the internal loss also shows a value
closer to paper than the metal material. On the other hand, since the diaphragm having a
honeycomb structure has a three-layer structure, the Young's modulus X and the density ρ
differ depending on the ratio of the thickness of the skin 1 and the thickness of the core 2.
Therefore, in order to use it as a diaphragm where E / ρ is the highest, it is necessary to select
the ratio of the thickness of the skin and the core to an optimum one. FIG. 2 is a graph when the
thickness of a skin of a GFRP honeycomb is 0.11 KL and the thickness of an aluminum core is
changed by 1 to 15 m1. From this result, when the GPRP skin is 0.1 mm, E / ρ is the highest
when the core thickness is between 11 and 5. In addition, if only the thickness of the skin is
increased without changing the thickness of the core, the Young's modulus becomes high.
However, the density also increases, and the difference in thickness of the skin will disappear
when viewed as Vρ. In addition, the same result as GPRP was obtained also with the
combination of 0 FRP skin and an aluminum core. As described above, it was found that the
highest H / ρ was obtained at the time of 050 when the ratio of the thickness of the skin to the
thickness of the core was-in the case of the diaphragm having a honeycomb structure. FIG. 3
shows sound pressure-frequency characteristics when the skin of 0.11 selected as described
above, the 0FRP of the core 31, and the GFRP honeycomb diaphragm are incorporated into a
2511 bass speaker. For comparison, the characteristics of the conventional cone paper
diaphragm are shown by a dashed dotted line. As a result, it was found that the expansion of the
high region on the frequency characteristic of the speaker is higher in the honeycomb diaphragm
in proportion to v / T / l). Furthermore, in the honeycomb diaphragm, since the high region is
extended and the thickness is larger than that of the cone paper diaphragm, the bending rigidity
can be increased, and the secondary distortion caused by the distortion of the vibration system is
the cone paper diaphragm About 10 dB better than the As described above, according to the
speaker diaphragm of the present invention, the diaphragm has a honeycomb structure, and the
ratio of the thickness of the skin to the thickness of the core is set to a value of 110 to 50 so as
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to obtain high E / ρ. Therefore, it is possible to satisfy all the conditions required for the
diaphragm, that the density ρ is small, the sound velocity 11 フ ァ is large, and the appropriate
internal loss 適当.
In the above embodiment, both core and skin materials are used with uniform thickness, but
when the thickness is different at each part, the average thickness of each is 17 "y +; D average
JN-average thickness of core The above effect can be obtained by making it a member.
4. Brief description of the drawings EndPage: 2 FIG. 1 is a cross-sectional view of the speaker
diaphragm according to the present invention, and FIG. 2 is I / ρ when the thickness of the core
of the honeycomb diaphragm of the present invention is changed. FIG. 3 is a graph showing the
sound pressure-frequency characteristics of the conventional corn paper diaphragm when the
honeycomb horizontal diaphragm n 鮎 diaphragm of the present invention is incorporated into
the bass speaker of the present invention, and FIG. 1 ... skin (surface material), 2 ... core (core
material). Agent Shinno-EndPage: 3
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