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JPS60171899

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DESCRIPTION JPS60171899
[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 that a wide
regeneration zone can be obtained even with a low elastic material such as paper and plastics.
However, depending on the degree, a speaker with a large cone-like depression or the like causes
a peak dip in the sound pressure frequency characteristic "-, which causes an obstacle to the
flatness of the sound pressure frequency characteristic. In order to solve these problems, in
recent years, a flat diaphragm using a nikham sandwich structure or the like has been studied,
and has been put into practical use. However, in order to secure the rigidity of the flat
diaphragm, a complicated manufacturing process such as a nick structure is required, and the
number of types of component members is extremely large, and the increase in weight and cost
can not be avoided at present. Therefore, the flat speaker is limited to a part of high-class
products, and a system for realizing 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 large number of shallow mini-cones of hollow are collected and each vertex is
simultaneously driven by one voice coil. This configuration includes a composite diaphragm in
which small diaphragms of a substantially polygonal pyramid (for example, triangular cone)
shape whose opening end is connected to the outer periphery of a dome-shaped or cone-shaped
diaphragm are radially arranged. Alternatively, a voice coil bobbin is directly connected to the
outer peripheral portion of a cone-shaped diaphragm, and each apex of the small diaphragm in
the outer peripheral portion is connected to the voice coil via a connecting cone connected by
point bonding. As a result, the high range is emitted from the central portion and the low range
from the outer peripheral portion, a speaker having a relatively wide band is obtained, and the
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diaphragm is obtained as an integral molded product, resulting in light weight and low cost. In
addition, since the depth of the depressions is considerably reduced, the peak dip as described
above is also significantly improved, and characteristics similar to those of conventional flat
panel loudspeakers have been obtained. However, the diaphragm for realizing the above method
has the dome or cone-shaped diaphragm substantially at the central portion and the small
diaphragm at the outer peripheral portion thereof, and is a mechanical two-way type, so the
outer peripheral portion It has a drawback that the sound pressure tends to be insufficient, and a
dip in the sound pressure is generated in the middle range. SUMMARY OF THE INVENTION The
present invention solves the above-mentioned drawbacks, and provides a speaker having a flat
sound pressure frequency characteristic, a lightweight and low cost diaphragm.
According to the present invention, there is provided a second diaphragm, comprising: a domeshaped or cone-shaped first diaphragm; and a plurality of substantially polygonal pyramidal
small diaphragms arranged continuously and radially around the outer periphery of the first
diaphragm. A composite diaphragm having a diaphragm, a voice coil bobbin having a tip bonded
to the outer periphery of the first diaphragm, and a substantially polygonal pyramid small
diaphragm having an open end constituting the second diaphragm. And a connecting cone
formed by bonding the second diaphragm to the inner surface of the second diaphragm so as to
abut all apexes of the second and connecting the other end to the abdomen of the voice coil
bobbin. By suppressing the divided vibration of the diaphragm and expanding the frequency
band that can be radiated from the outer peripheral portion, it is possible to obtain a smooth
sound pressure frequency characteristic without a drop in the midrange as a whole. Description
of the Embodiments Hereinafter, embodiments of the present invention will be described. FIG. 1
is a cross-sectional view showing a vibration system of a speaker according to a first embodiment
of the present invention, and FIG. 2 is a plan view of the same diaphragm. In FIG. 1, 1 is a
composite diaphragm in which unbleached kraft pulp is integrally formed and impregnated with
a phenolic resin to a width of about 30 and hardened, and a dome-shaped first diaphragm 2 and
a first diaphragm 2 at its center The second diaphragm 3 is composed of a plurality of
substantially triangular pyramid shaped small diaphragms arranged continuously and radially on
the outer peripheral portion of the diaphragm 2 and the planar shape thereof is shown in FIG. In
FIG. 2, 3a is a ridge line of the second diaphragm 3, 3b is a valley line thereof, and 3C is a vertex
of each substantially triangular pyramid shape. Reference numeral 4 denotes a connecting cone
whose open end is connected to the position of the apex 3 C, and the other end of the connecting
cone 4 is connected to the abdomen of the voice coil bobbin 5. The front end of the voice coil
bobbin 6 is bonded to the outer peripheral portion of the first diaphragm 2 fabricated integrally
with the scooped second diaphragm 3. FIG. 3 is an external perspective view of a combined cone
of the present embodiment. In FIG. 3, reference numeral 6 is an opening of the connecting cone 4
and the shape of the opening is serrated. Further, the end portions of the opening 6 are fitted and
in contact with each other on the inner surface of the second diaphragm 3 over the entire
circumference and are bonded. Further, the respective apexes 6a of the opening 6 and the
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respective apexes 3C of the second diaphragm 3 are bonded so as to coincide with each other.
The other end of the connecting cone 4 is adhered to the abdomen of the voice coil bobbin 5, and
the voice coil 6a provided at the lower end of the voice coil bobbin 5 is incorporated in the
magnetic gap (not shown) of the magnetic circuit. With the above configuration, the frequency at
which the second resonance of the diaphragm 3 causes the resonance is largely dependent on
the surface strength of the slope 3d in the hatched portion shown in FIG. Since the widest part of
the slope 3d of the small diaphragm is adhered to the open end of the opening 6 of the coupling
cone 4 and reinforced in the circumferential direction, the split resonance frequency can be
greatly increased.
In addition, sufficient strength and characteristics can be obtained even if it is made of a
lightweight, low-cost material such as paper or plastic, and a low-cost, highly efficient speaker
can be realized. Oka, the bonding portion at the open end may be in the vicinity of the apex 6a.
Next, a second embodiment of the present invention will be described. FIG. 4 is an external
perspective view of a connecting cone of a speaker according to a second embodiment of the
present invention. In FIG. 4, the slope 7 is a triangular surface 7! L, 7b, To and points e, f. It is a
combined cone formed by connecting a plurality of triangular faces 7d with g as a vertex, and
has almost the same effect as the combined cone 6 shown in FIG. This is a repetition of a
pentagonal pyramid connecting the bonding portions of points e, f, g and voice coil bobbin 5 with
the slope of the connecting cone, reinforced in the driving force transmission direction, and
further from the voice coil bobbin 5 to the second vibration. The energy transfer efficiency is
improved because the connection points of the plates 3 are straight. The first diaphragm 2 may
be a cone or a flat plate having rigidity. As described above, according to the present invention,
the open end of the coupling cone is brought into contact with the top of the second diaphragm,
and is bonded to the inner surface of the second diaphragm, and the second diaphragm is
reinforced all around Because of this, it is possible to suppress a divided vibration of the
composite diaphragm and obtain a speaker having a flat sound pressure frequency characteristic.
Also, even if it is made of a lightweight, low-cost material such as paper or plastic, sufficient
strength and characteristics can be obtained, so that a low-cost, high-efficient speaker can be
realized, which is unprecedented.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view showing a vibration system of a loudspeaker according to a first
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embodiment of the present invention, FIG. 2 is a plan view of the same diaphragm, FIG. 3 is an
external perspective view of the same connecting cone, and FIG. It is an external appearance
perspective view of the joint cone of the speaker of 2nd Example.
1 ... composite diaphragm, 2 ... 1st diaphragm, 3 ... 2nd diaphragm, 4.7 ... coupling cone, 5 ... voice
coil bobbin. Name of agent Attorney Nakao Toshio Other 1 person Figure 1
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