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JPS60171897

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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS60171897
[0001]
FIELD OF THE INVENTION The present invention relates to the improvement of the
characteristics of a planar equalizing speaker. The configuration of the prior art and its problems
Conventionally, a loudspeaker diaphragm having a cone shape is often used. This is because the
cone shape is structurally very high in bending strength in the vibration direction, so a wide
regeneration zone can be obtained even with a low elastic material such as paper or plastics.
However, depending on the degree, a speaker having a large cone-like depression or the like has
peaks and dips on the sound pressure frequency characteristics, which causes a problem in the
flatness of the sound pressure frequency characteristics. In order to solve these problems, in
recent years, a flat diaphragm using a nick-nika sand-sand structure or the like has been studied
and has been put into practical use. However, flat diaphragms require complicated
manufacturing processes such as a honeycomb structure in order to secure rigidity, and the
number of types of component members is also extremely large at present, so that an increase in
weight and cost can not be avoided. Therefore, the flat speaker is limited to a part of high-class
products, and a system that achieves flatness of sound pressure frequency characteristics at low
cost has been desired. Therefore, instead of the conventional single-cone paper, there is a system
in which a plurality of shallow mini-cones of hollows are assembled and their respective apexes
are simultaneously driven by one voice coil. This configuration includes a composite diaphragm
in which a plurality of substantially polygonal pyramid (for example, triangular cone) small
diaphragms whose opening ends are connected to an outer peripheral portion of a dome or cone
shaped diaphragm are radially arranged, the dome or cone The voice coil bobbin is directly
connected to the outer peripheral portion of the diaphragm, and the apexes of the small
diaphragms in the outer peripheral portion are connected to the voice coil through a coupling
cone. In this way, the high range is emitted from the central part and the low range from the
outer peripheral part, and a relatively wide band speaker is obtained, and the diaphragm is
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obtained as an integral molded product, so it is lightweight and low in cost. . In addition, since the
depth of the depression is quite small, the above-mentioned peak dip is also considerably
improved, and the same characteristics as those of the conventional flat panel loudspeakers have
been obtained. However, the diaphragm for realizing the above system has a dome or coneshaped diaphragm substantially at the center and a small diaphragm at the outer periphery
thereof, and is a mechanical two-way system, so the outer periphery The strength of the part
tends to be insufficient, and it has the disadvantage that a sound pressure depression is
generated in the midrange. The object of the present invention is to solve the above-mentioned
drawbacks, and it is an object of the present invention to provide a lightweight and low-cost
loudspeaker diaphragm having flat sound pressure frequency characteristics. Configuration of
the Invention According to the present invention, there is provided a composite diaphragm in
which a plurality of substantially polygonal pyramidal small diaphragms whose opening ends are
connected to the outer periphery of a dome or cone-shaped diaphragm are arranged radially; A
reinforcing wall provided on the inner surface of the small diaphragm and reinforcing the small
diaphragm in the circumferential direction is provided, thereby suppressing division vibration of
the composite diaphragm and radiating from the outer peripheral portion The possible frequency
band is expanded, and a smooth sound pressure frequency characteristic without a drop in the
midrange as a whole can be obtained.
Description of Embodiments Hereinafter, an embodiment of the present invention will be
described. FIG. 1 is a cross-sectional view showing a configuration of a speaker diaphragm and a
vibration system in an embodiment of the present invention. In FIG. 1, 1 is a composite
diaphragm in which a plurality of small triangular pyramidal small diaphragms radially formed
by integrally forming unbleached kraft pulp and impregnating and curing phenolic resin by
about 30%; 2 is a composite diaphragm The planar shape of the reinforcing wall will be
described in more detail with reference to FIG. In FIG. 2, 1a is a wire of the composite diaphragm
1, 1b is a valley thereof, 1C is a vertex thereof, and a vertex 1C is point-bonded to the open end
of a conical connecting cone 3 made of kl foil. The other end of the connecting cone 3 is
connected to the abdomen of the voice coil bobbin 4. The tip of the voice coil bobbin 4 is
connected to the outer periphery of the dome 6 with a dome that forms the central portion of the
composite diaphragm 1 and is integrally machined with the composite diaphragm 1. An edge 6 is
provided on the outer peripheral portion of the composite diaphragm 1. FIG. 3 is an external
perspective view of the reinforcing wall 2. In FIG. 3, 2a is a bent portion formed by bending the
upper edge of the reinforcing wall 2 into an L shape, and reinforces the reinforcing wall 2 itself.
The serrated end portion of the reinforcing wall 2 is bonded to the inner surface of the
substantially triangular pyramid small diaphragm constituting the composite diaphragm 1 over
the entire circumference. Also, the tips of the serrated ends of the reinforcing wall 2 are located
at the apex 1C. With the above configuration, the frequency at which division resonance of the
small diaphragms arranged radially on the outer peripheral portion of the dome 6 occurs is
determined by the surface strength of the hatched portion 1d shown in FIG. The split resonance
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frequency can be greatly increased by reinforcing the widest part of the triangular pyramidal
slope as shown in FIG. In addition, even if it is made of lightweight and low cost materials such as
paper and plastic, sufficient strength and characteristics can be obtained, and a low cost and
highly efficient speaker can be realized. As described above, according to the present invention,
the reinforcing wall is reinforced in the circumferential direction on the widest part of the
polygonal pyramidal slope of the small polygon plate having a substantially polygonal pyramid
shape radially around the periphery of the dome or cone diaphragm. By bonding the above, it is
possible to obtain a speaker having a flat sound pressure frequency characteristic. Even if it is
made of a lightweight, low-cost material such as paper or plastic, sufficient strength and
characteristics can be obtained, and an unprecedented low-cost, highly efficient speaker can be
provided, and the effect is great.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view showing the configuration of the speaker diaphragm and the
vibration system thereof in an embodiment of the present invention, FIG. 2 is a plan view of the
composite diaphragm, and FIG. 3 is an external perspective view of the reinforcing wall. is there.
1 · · · · · · Composite diaphragm, 2 · · · Reinforcement wall.
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