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JPS60171898

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DESCRIPTION JPS60171898
[0001]
FIELD OF THE INVENTION The present invention relates to a flat equalizing loudspeaker. The
configuration of the prior art and its problems Conventionally, a loudspeaker diaphragm having a
cone shape has often been used. This is because the cone shape is structurally very high in
bending strength in the vibration direction, so a wide reproduction frequency band can be easily
obtained even with a low elastic material such as paper or plastic. However, a speaker having a
cone-like depression or the like has a disadvantage that peaks and dips occur on the sound
pressure frequency characteristics depending on the degree. In order to solve these problems,
flat diaphragms using a honeycomb sandwich structure or the like have been studied and put
into practical use in recent years. FIG. 1 is a cross-sectional view of a conventional flat
loudspeaker. In FIG. 1, 1 is a yoke having a center pole 2, 3 is an annular magnet disposed on the
yoke 1, 4 is an upper plate disposed on the magnet 3, and thereby an outer peripheral portion of
the center pole 2 Is supported by the edge member 7 on the frame weir. In the flat diaphragm 6,
the open end of the connecting cone 8 is joined to the portion of the circular nodal circle a, and
the voice coil 10 provided at the other end of the connecting cone 8 has a yoke 1 ░ center pole
2.. It is supported by a damper 11 for piston movement in the magnetic gap of the magnetic
circuit consisting of the magnet 3 and the upper plate 4. The flat diaphragm 6 uses, for example,
a sand-inch structure having a honeycomb shown in FIG. 2 as a core material. FIG. 2 is a crosssectional view of a honeycomb sandwich diaphragm. In FIG. 2, the surface material 12 made of
metal foil such as aluminum is bonded to the end face of the aluminum honeycomb material 14
through the adhesive 13 to form a diaphragm. However, in the conventional speaker configured
as described above, not only the flat diaphragm 6 becomes complicated due to the complicated
structure compared with the paper cone, it also increases the weight of the vibration system and
reduces the speaker efficiency. It had a drawback. SUMMARY OF THE INVENTION The present
invention solves the above-mentioned drawbacks, and provides a flat speaker having a sound
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pressure frequency characteristic easily without using a complicated flat diaphragm such as a
sandwich structure. The present invention comprises vibration members having two or more
substantially conical and open polygons connected at their open ends, and a voice coil bobbin
formed by driving the apex portions of the vibration members. It is a structure. By dividing the
vibrating body in this manner, the depth of the individual depressions becomes smaller than in
the case of the cone alone, and therefore it is possible to suppress peaks and dips on the sound
pressure frequency characteristics due to the depressions.
Description of the example. Hereinafter, embodiments of the present invention will be described
with reference to the drawings. FIG. 3 is a cross-sectional view of a vibration system of a
loudspeaker according to a first embodiment of the present invention, and FIG. 4 is a plan view of
the same diaphragm. In FIG. 3, 16 is formed by thermoforming integrally a polyethylene
synthetic fiber sheet containing 30 (W / W%) of carbon fibers (diameter 6 ?m) having a fiber
length of 0.2 to 1 wand, and a plurality of substantially triangular pyramidal shapes The planar
shape of the diaphragm is shown in FIG. In FIG. 4, 15a is a ridge line, 15b is a valley line, and a
portion 15c corresponding to 70% of the diameter of the diaphragm is the deepest. The open end
of the connecting cone 16 made of aluminum is bonded to the position 15 c, and the voice coil
bobbin 17 is connected to the other end of the connecting cone 16. A voice coil 18 provided at
the lower end of the voice coil bobbin 17 is incorporated in the magnetic gap of the magnetic
circuit of FIG. Here, since the nodal circle a of the primary resonance of the diaphragm 16
appears in 70% of the diameter of the diaphragm including the additional mass by the edge
member 7, the individual triangles constituting the diaphragm 16 are also included in this
embodiment. The strong center or drive point of the pyramidal unit is set to the same position.
FIG. 6 is a sound pressure frequency characteristic diagram showing characteristics when the
diaphragm of the present embodiment is manufactured to a 26 crn diameter speaker. According
to the present embodiment, it can be seen that a reproduction band substantially equivalent to
that of the conventional flat loudspeaker is obtained, and the sound pressure is 1 to 1.5 dB
higher. This is because the diaphragm of the conventional example has a weight of 16 y and a
weight of 9 F in this embodiment. As described above, according to the present embodiment,
although the configuration uses the simple diaphragm 15, the characteristics equivalent to the
conventional flat diaphragm or the defect of suppressing the resonance peak is more than the
characteristics of the honeycomb flat diaphragm. It is obtained. Furthermore, since the driving
force is divided into a plurality of vibrating members, the diaphragm area per unit can be
reduced, and divided resonance is less likely to occur, and piston vibration is performed up to a
high frequency. Further, since each vibrating member has a shape close to a cone shape, it has a
feature that sufficient characteristics can be obtained even if it is formed of light and inexpensive
materials such as paper and plastic. In this embodiment, although a composite sheet of a
composite sheet of carbon fiber and polyethylene synthetic fiber is integrally formed as the
material, a sufficient effect can be obtained even if the pulp is made by the ordinary paper
making method. Further, the shape of the diaphragm 16 is the same as that of the second
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embodiment as shown in FIG.
In FIG. 6, 20 corresponds to the position 15c in FIG. 4 and is a driving point, and the cone shape
is a straight cone. In addition, the diaphragm 16 may be configured by a substantially polygonal
pyramid other than the substantially triangular pyramid. Next, a third embodiment of the present
invention will be described. FIG. 7 is a cross-sectional view of the vibration system of the speaker
of this embodiment. The plane shape is common to the plan view of FIG. 4 shown in the first
embodiment. In FIG. 7, the slopes of the units constituting the diaphragm 21 are curved. That is,
the diaphragm 21 is characterized in that the valley line 16b shown in FIG. 4 is a straight line in
the first embodiment, but is a curved line in the present embodiment. FIG. 8 shows sound
pressure frequency characteristics when a speaker of 26 crn diameter is produced in the same
manner as in the first embodiment using the diaphragm 21 having the above configuration. In
FIG. 8, in the characteristics in the present embodiment, the high frequency resonance frequency
is lowered, but the resonance park is also greatly lowered. This makes the design easy when
systemizing the speaker. That is, when the resonance peak is high, an electric circuit for peak
cancellation is required, and a cost amplifier can be obtained, and a defect that degrades
distortion characteristics can be prevented. Effects of the Invention As described above,
according to the present invention, the sound pressure frequency characteristic is flat and can be
made into a speaker with high efficiency, and the diaphragm can be easily manufactured since it
has a shape that can be integrally formed. Are also dogs. In addition, a speaker with a low highfrequency resonance peak can be realized by making each slope forming the diaphragm unit a
curved surface and making a valley line a curve, that is, it has an effect of facilitating system
design. 0
[0002]
Brief description of the drawings
[0003]
1 is a cross-sectional view of a conventional flat speaker, FIG. 2 is a cross-sectional view of the
same diaphragm, FIG. 3 is a cross-sectional view of a vibration system of the speaker in the first
embodiment of the present invention, and FIG. 6 is a plan view of the sound pressure frequency
characteristic of the speaker, FIG. 6 is a plan view of the speaker in the second embodiment, and
FIG. 7 is a vibration system of the speaker in the third embodiment. FIG. 8 is a sound pressure
frequency characteristic diagram of the speaker in the third embodiment.
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16 иии Diaphragm, 17 ииииии Voice coil bobbin. Name of agent Attorney Nakao Toshio and others 1
person Fig. 1 Fig. 2 Fig. 3 Fig. 5 Fig. 5 Fig. 5 ? / 5 d 2 ? 5 ? ? llc 2 k 6 The
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