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JPS5614797

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DESCRIPTION JPS5614797
Description 1, title of the invention
Speaker diaphragm
3. Detailed Description of the Invention The present invention relates to a speaker diaphragm of
a sandwich structure in which a tape-like core material is supported and adhered by a surface
material, the size of the nodal circle can be arbitrarily changed, and the frequency reproduction
band of the speaker is expanded. , Flatten the frequency characteristics, or reduce the
temperature rise of the voice coil at the time of large input) и и и и providing a diaphragm for Lj & A
'f @ R +' &-force . An embodiment of the present invention will be described below with reference
to FIG. In Fig. 1, it is a circular surface material made of metal foil such as 1.1'Jj dialuminum,
titanium etc. or plastic film such as polyester, polyvinyl chloride etc., 2 is metal foil such as
aluminum, titanium etc. or polyester, polychlorinated It is a tape-like core material made of
plastic film such as vinyl. The core material 2 is interposed between the surface materials 1 and
1 'at right angles to the surface of the surface material 1.1'. The above tape-shaped core material
2 is seen from the central part side of the surface materials 1 and 1 'toward the outer peripheral
part side and is turned back on the outer peripheral part side, facing towards the central side and
further to the outer peripheral side. It is arranged to bend radially. The outer peripheral side
bending portions A are all located on a circle having substantially the same diameter, while the
inner peripheral side bending portions are the bending portion B reaching the vicinity of the
central portion of the surface member 1.1 ', and the center It consists of a bent portion B 'which
is folded back at the middle portion without reaching a portion, and in this embodiment, two bent
portions B' are formed between the bent portion 8 and the-portion 8. It is to be noted that the
tee, 1 ?? -shaped core material 2 and the surface material 1, 1 'are bonded to EndPage: 1. In
this manner, a flat diaphragm 3 of a sand-inch structure in which the core material 2 is held
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between the facing materials 1 and 1 'is obtained. In the embodiment shown in FIG. 1, the
amount of the core material 2 is larger on the outer peripheral side of the diaphragm 3 than on
the central side, and the surface density (diaphragm weight per unit area) is larger on the outer
peripheral side. Become. In FIG. 1, b indicates the position of the nodal line at the time of
resonance of the diaphragm in this embodiment, and a indicates the nodal line when the surface
density on the outer peripheral side and the inner peripheral side of the diaphragm is constant.
The position of the node line is more on the outer peripheral side in the diaphragm where the
surface density is larger on the outer peripheral side than on the central side as in the present
embodiment as compared to the diaphragm in which the position is shown and the surface
density is constant. It is a thing. FIGS. 2A and 2B respectively show the vibration mode A of the
diaphragm having a constant surface density and the surface density on the outer peripheral side
of the diaphragm moving plate of the embodiment of the present invention having a larger
surface density on the central side. In contrast to the diameter of 0.678 D, in the case of this
embodiment of B, it is thicker than 0678 D, and B is greater than A for the purpose of stopping
the detrapment vibration. The diameters of the coil bobbin 4 and the voice coil 6 are increased,
and the input resistance of the speaker is improved.
One of the factors that determine the input resistance of the speaker is the destruction of the
voice coil due to the temperature rise at the time of large input application. The temperature rise
of the voice coil for the same electrical input is lower as the voice coil aperture is larger, and the
diaphragm using a diaphragm with a large voice coil aperture as in this embodiment has
excellent input resistance characteristics. It is. As described above, in the embodiment shown in
FIG. 1, since the surface density on the diaphragm outer peripheral side can be increased and the
position of the node line can be moved to the outer peripheral side, the input resistance
characteristic can be obtained without increasing the diaphragm aperture. Speakers can be
obtained. FIG. 3 shows another embodiment of the present invention. In this embodiment, the
positions of the center-side bent portions C of the core material 2 are aligned substantially on the
same circle, and the outer-peripheral-side bent portions D and D 'are located on the outer
peripheral side and the middle portion. According to this practical example, the surface density
on the central portion side can be increased from the outer peripheral portion side of the
diaphragm, and the node line position is closer to the central portion side than the node line
position of the diaphragm having a constant surface density. In this case, it is possible to reduce
the size of the nodal wire and the useless voice coil aperture, and hence the magnetic circuit
becomes compact and inexpensive. According to this embodiment, when using a voice coil of the
same diameter as the voice coil diameter of the diaphragm having a constant surface density, the
diaphragm diameter increases and the diaphragm area increases, so the efficiency of the speaker
is improved. It is As described above, according to the present invention, it is possible to easily
change the surface density on the central portion side and the outer peripheral portion side of
the diaphragm, to arbitrarily change the nodal line position, and to improve the input resistance
of the speaker, or The magnetic circuit can be miniaturized and the efficiency can be improved.
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4. Brief Description of the Drawings FIG. 1 is a perspective view showing a part of a speaker
diaphragm in an embodiment of the present invention with a cutout, FIG. 2A. B is a diagram
showing the vibration mode of the conventional speaker vibration plate having a constant
surface density and the speaker vibration plate of the present invention shown in FIG. 1, and FIG.
3 is a part of another embodiment of the present invention It is a perspective view which shows
with a notch. 1.1 ? иииииииииии Surface material, 2 иии 8 ?, 3 иии Diaphragm, 4 иии Coil bobbin, 5 иии Voice
coil. Name of agent Attorney Nakao et al. 1 person EndPage: 2 Fig. 2 Fig. 3 YIAEndPage: ?
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