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JPS61255198

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DESCRIPTION JPS61255198
[0001]
FIELD OF THE INVENTION The present invention relates to an equalizer of a speaker unit having
a circular flat diaphragm. Prior Art In recent years, flat plate speakers have come to be used in
place of cone-shaped speakers, but since flat plate speakers have a sharp high peak in the high
region, these peaks are removed electrically by an equalizer of one frequency characteristic It has
Hereinafter, an example of the above-mentioned conventional equalizer will be described with
reference to the drawings. FIG. 4 is a graph showing a general sound pressure frequency
response of a flat plate speaker. The figure shows that there is a high and sharp peak in the high
region. This is because the area around the flat diaphragm vibrates violently. FIG. 6 shows a
circuit diagram of the equalizer according to the electrical method. Reference numeral 1 denotes
an input terminal, and 2 denotes an equalizer having two terminals. The equalizer is comprised of
a coil 3 and a capacitor 4 connected in parallel with each other. One end of the equalizer 2 is
connected to the input terminal, and the other end is connected to the speaker 6. The operation
of the equalizer configured as described above will be described below. The voltage applied to
the input terminal 1 is applied to the speaker 6, but when a voltage having a resonant frequency
(hereinafter this frequency is called fh) determined by the inductance of the coil 3 and the
capacitance of the capacitor 4 is applied to the terminal 1, the speaker 6 The voltage applied to is
attenuated by the equalizer 2. The amount to be attenuated depends on the value of Q of the
circuit configured by the equalizer 2 and the speaker 6. FIG. 6 shows the transmission
characteristics from the input terminal 1 to the input terminal of the speaker 6, where the
maximum attenuation is obtained at the frequency fh and the amount of attenuation decreases as
the distance from the frequency fh increases. By adjusting the inductance of the coil 3 and the
value of the capacitance of the capacitor 4 appropriately to match fh with the peak frequency of
the sound pressure frequency characteristic of the speaker 5, the attenuation shape near fh is
near the peak frequency of the sound pressure frequency characteristic of the speaker 6. By
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getting close to the curve of (1), a smooth sound pressure frequency characteristic can be
realized. FIG. 7 shows the effect of the equalizer. The dotted line shows the sound pressure
frequency characteristics when the equalizer 2 is not present, and the solid line shows the sound
pressure frequency characteristics when the equalizer 2 is present. Problems to be Solved by the
Invention However, in the configuration as described above, there is a problem that fh does not
coincide with the frequency giving the peak of the sound pressure of the speaker 6 due to the
variation of the value of the coil 3 ░ capacitance 4 I had it. At frequencies below fh, current
flows mainly through the coil 3, but there is also a problem in that a voltage drop occurs due to
the resistance component of the coil 3 to lower the efficiency.
Furthermore, the n-th order (n = 2.3, 4. ииии) The harmonics take large values at the peak
frequency of 17n, but among the above components, those based on current distortion are
reduced by the equalizer 2, but there is no effect to reduce distortion components due to other
causes . SUMMARY OF THE INVENTION In view of the above problems, the present invention
provides an equalizer having no variation in fh, no reduction in efficiency, and an effect of
reducing distortion at 1 / n of the peak frequency. Means for Solving the Problems In order to
solve the above problems, the equalizer of the present invention comprises a flat diaphragm, an
edge bonded in the form of a down roll, and an annulus which covers the edge. It is Operation
The present invention constitutes a kind of acoustic filter according to the above-described
configuration, and the peak is eliminated by matching the resonance frequency to the peak of the
frequency characteristic of the flat panel speaker. Embodiment An equalizer according to an
embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a
cross-sectional view of a loudspeaker using an equalizer according to an embodiment of the
present invention. 6 is a center ball, 7 is a magnet, 8 is a plate, 9 is a frame, 10 is a damper, 11 is
a voice coil, 12 is a coupling cone, 13 is a plane diaphragm, 14 is a down roll edge and the inner
periphery is a plane vibration The outer peripheral portion of the plate 13 is bonded to the rear
side of the outer peripheral portion thereof, and the outer peripheral portion of the plate 13 is
bonded to the opening flange portion of the frame 9. The numeral 16 is adhered to the outer
periphery of the edge with an arrow. An equalizer 16 has a ring shape and is joined to the
opening flange portion of the 7th frame 9 so as to cut (-) the outside of the edge 14. The
operation of the equalizer configured as described above will be described with reference to FIG.
First, FIG. 2 is an enlarged detail view in the vicinity of the equalizer, and the same parts as in
FIG. A cavity 17 is formed of an equalizer 16, an edge 14 and a flat diaphragm 13. 18 is the
outlet portion of the cavity 17. The geometry of the equalizer 16 is determined in such a way
that the compliance of the cavity 17 and the air mass of the outlet part 18 cause an acoustic
resonance, the resonance frequency of which coincides with the frequency causing the peak of
the frequency response of the flat loudspeaker. The resonance by the compliance of the cavity 17
and the air mass of the outlet portion 18 is parallel resonance in the acoustic circuit, so the
mechanical impedance becomes large and the excessive vibration around the diaphragm is
suppressed and the peak on the sound pressure frequency characteristic is eliminated. Have.
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FIG. 3 is a graph of sound pressure frequency characteristics showing the effect of the present
invention. The dotted line shows the characteristics without the equalizer, and the solid line
shows the characteristics with the equalizer of the present invention. The equalizer raises the
sound pressure at a frequency considerably lower than the peak and lowers the sound pressure
at a frequency significantly higher than the peak, because the equalizer having such a structure
also has a front room effect. This anterior chamber effect reduces unwanted response at peak-topeak frequencies, resulting in a more balanced and desirable overall frequency response. Further,
it can be seen from FIG. 3 that the equalizer of the present invention has the effect of sharply
reducing distortion. Moreover, this equalizer has the feature that it can be realized at low cost. As
described above, according to the present embodiment, the peak on the frequency characteristic
is eliminated and distortion is reduced by providing the flat diaphragm, the edge bonded to it in
the form of down roll, and the annular structure equalizer which covers the edge. be able to.
Moreover, it can be realized at very low cost, and it also has the feature that when the variable
size shape is determined, the equalizer curve with stable characteristics can be obtained because
the filter curve is not broken. Effects of the Invention As described above, the present invention
achieves peak removal without any variation in characteristics by providing an annular structure
that obscures an edge, and reduces distortion due to power supply distortion as well as other
factors. Can. In addition, it can be realized at very low cost, and it can be characterized in design.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view of a speaker equipped with an equalizer according to a first
embodiment of the present invention, FIG. 2 is an enlarged view around the equalizer of FIG. 1,
and FIG. 9 shows frequency characteristics of the embodiment of the present invention Fig. 4 is a
graph showing the general frequency response of a flat plate speaker, Fig. 6 is a circuit diagram
of a conventional equalizer, Fig. 6 is a transmission characteristic diagram of a conventional
equalizer, and Fig. 7 is an effect of the conventional equalizer Is a graph showing
13 ииииии Flat diaphragm, 14 ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Equalizer (annular structure).
Name of Agent Attorney Nakao Toshio and 1 other person I 6--Ikoide Figure 2 Figure 3 Shoulder
3 L number ? Figure 4 Figure 6 Freeze J + J 1 Nami Maki
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