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JPS5439626

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DESCRIPTION JPS5439626
Specification L Title of Invention
Cone-shaped honeycomb diaphragm
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cone-shaped
honeycomb diaphragm for a speaker. In general, the diaphragm of the speaker is light and the
specific modulus E // (FX: Young's modulus, ρ: density) is large. And it is required to have a
moderate internal loss tanJ. Especially in the case of a cone-shaped diaphragm, the inner
circumference (voice coil side) must faithfully propagate the vibration of the voice coil bobbin. A
large specific modulus is required. On the other hand, the outer peripheral portion (edge side)
must absorb the reflection vibration from the edge, that is, it is ideal that the internal loss tan δ
is moderately large. However, as shown in FIG. 1, the conventional cone-shaped honeycomb
diaphragm is composed of the core material of the same shape as the skin material of the same
thickness in both the inner and outer peripheral parts, the inner peripheral part and the outer
periphery Part E / ρ. Since the tana values are exactly the same, and the values of B / p and tana
are generally in inverse proportion to each other, it has been impossible to sufficiently groove
the required characteristics as the above-mentioned speaker diaphragm. In the present invention,
the E / 材 of the sheet material in the homogeneous state is proportional to the thickness, while
the tan δ is inversely proportional to the thickness. By making the outer peripheral portion
thinner than the inner peripheral portion as in the above, it is intended to increase the jan δ of
the outer peripheral portion and to reduce the overall weight of the system. For example, a glass
fiber is uniformly blended and hardened to have a volume ratio of 0.27 with respect to an epoxy
resin, and reinforced plastic (FRP) sheets produced to respective thicknesses are determined by
the vibration lead method to obtain Vρ and janak. become that way. EndPage: Table 1 As a core
material, using the above-mentioned glass fiber reinforced plastic as a skin material, a sheet
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having a thickness of 0.40 mp at the inner peripheral edge and a thickness of 0.18 m + at the
outer peripheral edge The sound pressure frequency characteristics of a cone-shaped honeycomb
diaphragm made of aluminum foil with a thickness of 0.18 sa ++, a cell size of 4.8 m and a height
of 0.8 m are as shown in broken @ (5) in FIG. . The diaphragm according to the present invention
has a high frequency compared to the sound pressure frequency characteristics (solid line (4) in
FIG. 8) of the conventional honeycomb diaphragm having the same thickness of the skin material
of 0.4 and the same outer skin and inner skin Area peak. Dip is small, immediately rt, 7 '(% sign.
In order to manufacture the skin material of the present invention, the formed sheet is cut into a
predetermined shape and then the outer peripheral portion is scraped off to a predetermined
thickness, or the outer peripheral portion is made thinner than the inner peripheral portion at
the time of sheet production. It can be easily manufactured by molding a sheet with a mold.
As described above, the thickness of the inner loss tana of the outer peripheral part is increased
by making the outer part thinner than the thickness of the entire inner peripheral part of the skin
material, and the whole volume of the entire volume is reduced immediately. It is an object of the
present invention to provide a cone-shaped honeycomb-shaped resin plate having an i ′ ′ LfC
acoustic characteristic.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional coneshaped honeycomb diaphragm, and FIG. 2t, a cone-shaped nonicum-like shape according to the
present invention! FIG. 8 is a back pressure frequency characteristic view of the cross section of
the 12I plate, (2) shows the core material, and (3) shows the skin material of the present
invention. Agent STF-Fig. 1! ←--緘 EndPage: 2
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