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JPS63278490

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DESCRIPTION JPS63278490
[0001]
FIELD OF THE INVENTION The present invention relates to an electrodynamic unit used, for
example, for a telephone 9 communication device. Prior Art FIG. 4 is one of the sectional side
views of a conventional electrodynamic speaker microphone unit, wherein 1 is a top plate, 2 is a
magnet, 3 is a plate with a center ball, 4 [frame, 6 is a terminal] 6 is a back cover, 7 is a
diaphragm, 8 is a voice coil, 9 is a front cover, 1 o is a front air chamber, and 11 is a vent. トップ
プレート1. マグネット2. The center ball plate 3 is combined to form a magnetic circuit
having a concentric magnetic air gap, which is coupled to the inside of the frame 4 to constitute a
housing assembly. The voice coil 8 is connected to the diaphragm 7 to form a vibration system,
and the peripheral portion of the vibration system 7 is connected to the frame 4 of the housing
assembly, and the terminals 5 provided on the voice coil 8 and the frame 4 Electrically connect
between them. Furthermore, in front of the diaphragm, the front cover 9 is connected to the back
of the frame, and the back cover 6 is connected to constitute a speaker and a microphone unit. In
the above-described speaker and microphone unit configuration, a front air chamber 1o is
formed between the front cover 9 and the diaphragm 7, and the front cover 9 acoustically
couples the front air chamber 1o to the front of the unit. Ventilating holes 11 are provided. The
front air chamber 10 operates as an acoustic capacitance, and the vent hole 11 operates as an
acoustic inertance, so that the acoustic circuit becomes as shown in FIG. 5, and an acoustic circuit
person on the back of the diaphragm including an electroacoustic transducer. If, in the case of
the hands and speakers on the front of the unit and the ear of the human body, and if the
microphone, the acoustic high band cut filter is inserted in the connection part of the acoustic
circuit in the mouth of the human body I have cut the range. In the figure, 0 is a front air
chamber capacitance, and L is a vent inertance. Problems to be solved by the invention However,
with a single-stage high-pass filter, the attenuation from the cut-off frequency is not sufficient
and the occurrence of peaks etc. in the unnecessary high-pass is recognized. As a microphone
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unit, ambient noise is picked up As a speaker unit, the user has had a sense of discomfort, such
as the presence of lines in a row, or the speech intelligibility is lowered, so the high frequency is
cut by the circuit in the used device. The present invention is intended to solve the abovementioned conventional problems, and it is an object of the present invention to provide an
electrodynamic unit having a high level of attenuation above the cutoff frequency and a high
level of unnecessary highs. I assume.
Means for Solving the Problems In order to achieve the above object, the present invention
provides a front air chamber formed between the front cover and the diaphragm, an air chamber
directly transmitting acoustic vibration from the diaphragm on the front of the diaphragm and
The air chamber is divided into two air chambers directly connected to the air vents leading to
the front of the unit, and the air chambers connect the two air chambers. By the above-described
configuration, a two-stage acoustic high-pass filter is configured to increase the attenuation
factor of the high range and to set the unnecessary high range to a sufficiently low level.
Embodiment An embodiment of the present invention will be described with reference to FIG.
FIG. 1 is a cross-sectional view of an electrodynamic speaker and a microphone unit according to
an embodiment of the present invention, wherein 21 is a top plate, 22 is a magnet, 23 is a plate
with a center pole, 24 is a frame, 26 is a terminal, 26 is a back cover, 27 is a diaphragm, 28 is a
voice coil, 29 is a first front cover, 3o is a first front air chamber, 31 is a first vent, 32 is a second
front cover, 33 is a second front air The chamber 34 is a second vent. トッププレート21、マグ
ネット22. The center poled plate 23 is combined to form a magnetic circuit having a
concentric magnetic air gap, which is coupled to the inside of the frame 24 to constitute a
housing assembly. The voice coil 28 is coupled to the diaphragm 27 to form a vibration system,
and the periphery of the diaphragm 270 of the vibration system is coupled to the frame 24 of the
housing assembly, and the voice coil 28 and the terminal 26 provided on the frame 24
Electrically connect between Furthermore, the pack cover 6 is connected to the back of the frame
24, the first front cover 29 is connected to the front of the diaphragm, and the second front
cover 32 is connected to the front of the first front cover 29. Configured. In the above-described
speaker and microphone unit configuration, the first front air chamber 3o is formed between the
first front cover 29 and the diaphragm 27, and the second front cover 29 and the second front
cover 32 are secondly formed. A front air chamber 33 is formed. Furthermore, the first front air
chamber 3 o and the second front air chamber 33 are acoustically coupled by the first vent 31 of
the first front cover 29, and the air vent 34 of the second front cover 32 produces the second
front air. The chamber 33 and the front of the unit are acoustically coupled. FIG. 2 shows an
equivalent circuit of the configuration according to the present embodiment. The first front air
chamber 3o and the second front air chamber 33 operate as the acoustic capacitances C, C2, and
the first air hole 31 and the second air hole 34 respectively have the acoustic inertance L4.
Act as L2. Therefore, the acoustic circuit on the back of the diaphragm including the
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electroacoustic transducing unit, the hands on the front of the unit and the speaker unit, the ear
of the human body, and in the case of the microphone unit, the connecting circuit of the acoustic
circuit up to the mouth of the human body The high frequency cut filter of the above is inserted,
and the high frequency band outside the necessary communication band can be sharply cut, and
the frequency characteristic without the unnecessary high frequency band as shown by the solid
line in FIG. 3 can be obtained. The broken line is a characteristic diagram of the conventional
example. Effects of the Invention As described above, according to the present invention, the
front air chamber formed between the front cover and the diaphragm, the air chamber to which
acoustic vibration is directly transmitted from the diaphragm on the front of the diaphragm, and
the air vent communicating with the front of the unit By separating the two air chambers in the
connected air chamber and connecting the two air chambers with air holes, a two-stage acoustic
high-pass filter is configured in one unit, and the attenuation factor of the high range is A
speaker unit as a receiver and a microphone unit as a transmitter are provided with a high level
and an unnecessary high range set at a sufficiently low level.
[0002]
Brief description of the drawings
[0003]
1 is a cross-sectional view of an embodiment of the present invention, FIG. 2 is an equivalent
circuit diagram of an acoustic system of this embodiment, FIG. 3 is an output sound pressure
frequency characteristic diagram, and FIG. 4 is a conventional electrodynamic speaker
microphone FIG. 5 is a sectional side view of the construction of the unit, and FIG.
31 ··· First vent, 32 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · 2 second vent . Name of Agent Attorney Nakao Toshio 1 other person
2I-Top plate 3- Voice coil n-With plate with mere ball 3 o-Oh front of mind! 1-Fair 31-O vent 1
terminal X-on face-striking bar 3-back swords bar 33-onit QW: r air chamber n-twisting frame Xo 2 air-passing ring Fig. 1 Fig. 2 Figure
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