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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker diaphragm, and more particularly to a flat diaphragm having a honeycomb structure.
The structure of the prior art and the problems thereof As the flat plate diaphragm, one having a
prior structure having an aluminum foil material or one in which a cone portion is filled with a
foamed plastic material has been used conventionally. However, the honeycomb flat diaphragm
obtained from the aluminum foil material is heavy, and in order to be lightweight, it is necessary
to make the thickness of the material thin. However, the hardness of the aluminum itself is low,
and the manufacturing problems and appearance tend to deteriorate. That is, since the skin
material is weak at the same time as the core material is easily deformed, the core shape is
exposed to the surface of the skin. On the other hand, flat diaphragms filled with foamed plastic
material in the cone part are not only heavy in weight and sound quality is not good, and
diaphragms with unsatisfactory frequency characteristics, that is, diaphragms with low
elongation in the high region are obtained. Absent. SUMMARY OF THE INVENTION The object of
the present invention is to improve the disadvantages of the prior art, and it is an object of the
present invention to provide a flat diaphragm for a speaker which is reduced in weight and has
high rigidity and good frequency characteristics. Constitution of the Invention In order to achieve
the above object, the present invention is a constitution using alloy foils of aluminum and lithium
as upper and lower skin materials to be attached to the upper and lower surfaces of a core
material having a honeycomb shape. By using an alloy foil of aluminum and lithium for the upper
and lower skin materials, it is possible to obtain a flat diaphragm for a speaker which is light in
weight and excellent in rigidity and has excellent frequency characteristics when used as a
speaker. Description of Embodiments Hereinafter, an embodiment of the present invention will
be described with reference to the drawings. In FIG. 1, 1 is a top plate, 2 is a plate having a
magnet 3 is a plate having a center pole, 4 is a voice coil, 6 is a frame, 6 is a camfling cone, 7 is a
flat diaphragm made of a no-Nickam core, 8 is an unetched, 9id suspension, 1o indicates a
gasket. The present invention is an improvement of the flat diaphragm 7 in the flat speaker
having such a configuration. 2 shows a flat plate diaphragm 7 using a nick core, comprising a
core 7A having a nick shape, an upper skin 7B and a lower skin 7C. The flat diaphragm 7 is
composed of a core material A and skin materials 7B and 7C made of an alloy foil obtained from
aluminum and lithium, and the composition of lithium is 2 to 3 wt% in the embodiment. This
alloy foil is light in weight and excellent in elasticity, and can be reduced in weight and excellent
in frequency characteristics as compared with the conventional aluminum и vicham diaphragm.
The physical-property comparison with the aluminum of "A" miu 4- lithium 4 joint city utilized
for this invention is shown. (Physical Properties of Foil) Lithium is contained at 2.5%. Young's
modulus Density Specific modulus E (О 1 o 10 dyn / cd) y / C d x 1 o 10 (WSeC) 2 Atbenium
single substance 71.0 2.70 26.2 As described above, the alloy foil used in the present invention
is compared to the conventional aluminum single substance Thus, as shown in FIG. 3, good
reproduction characteristics of sound pressure frequency characteristics can be obtained in the
case of using a speaker having an aperture of 18 crn. In FIG. 3, a is the characteristic of a flat
speaker using the flat diaphragm for a speaker according to the present invention, b is the
characteristic of a flat speaker using a conventional flat diaphragm for a speaker made of
aluminum, and 3 is a cone filled with a foam material. It is a characteristic view of the flat
speaker using a flat diaphragm. Although the core material 7A and the skin materials 7B and 7C
are all made of aluminum-lithium alloy foil as the above embodiment, only the skin materials 7B
and 7C may be made of aluminum-lithium alloy foil. . Effects of the Invention As described above,
the flat diaphragm for a speaker of the present invention is light in weight and excellent in
rigidity, and has excellent frequency characteristics when used as a speaker, causing deformation
of the skin material or floating on the core material or surface. Without being said, it becomes a
dog of industrial value.
Brief description of the drawings
FIG. 1 is a cross-sectional view of a flat speaker having a honeycomb flat plate diaphragm, FIG. 2
is a perspective view of the main part of the flat plate diaphragm for speaker of the present
invention, and FIG. 3 is a flat plate of the present invention and the conventional flat plate. It is a
characteristic view of the flat speaker using a diaphragm.
7A иииииии honeycomb shape core material, 7B иии и on the skin material, 7C ииии under skin material.
Name of Agent Attorney Nakao Toshio and 1 other person Figure 1 Figure 2 # j 7A
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