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JPS6184992

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DESCRIPTION JPS6184992
[0001]
INDUSTRIAL APPLICABILITY The present invention relates to, for example, a speaker intended to
reproduce an audio signal used in a telephone, a radio, etc. in the vicinity of the ear, an audio
signal used in an acoustic coupler etc. in the vicinity of a microphone The present invention
relates to a speaker intended to be reproduced by the 2. Description of the Related Art In the
above-mentioned industrial field, in recent years, the speakers in the above-mentioned industrial
field have come to use a lot of speakers similar to the rear sealed configuration, instead of
diverting direct radiation speakers. Hereinafter, a conventional speaker will be described with
reference to the drawings. FIG. 1 is a cross-sectional view of a conventional speaker. In FIG. 1, 1
is a buckle plate, 2 is a diaphragm, 3 is a voice coil, 4 is a voice coil lead wire, 5 is a top plate, 6 is
a magnet, 7 is a plate with a center ball, and 8 is a speaker housing. Reference numeral 11 is a
front air chamber, 12 is a back air chamber, and 9 is a vent, which generates the air flow shown
in 1o. FIG. 2 is a schematic plan view of the vibration system, in which 20 is a diaphragm, 21 is a
voice coil, 22 is a voice coil lead, and 23 is a vent. A magnetic circuit composed of a top plate 6
magnet 6 and a plate 7 with a center pole having a through hole at the center is fixed inside the
speaker housing 8 formed of a nonmagnetic material such as resin, and the voice coil 3 is
bonded. The peripheral edge of the vibration system configured by wiring the voice coil lead wire
4 on the diaphragm 2 made of a non-air-permeable material such as resin film, metal foil, etc.
The back air chamber 12 is formed, and the voice coil 3 is configured with a magnetic circuit
force. Hereinafter, the operation of the loudspeaker configured as described above will be
described with reference to FIGS. 3 to 4. FIG. 3 is an approximate equivalent circuit in the case
where the baffle 1 is closely attached to the ear or the measuring coupler shown in FIG. F is the
electrode force, Ma, Cd, rd is the mechanical impedance of the vibration system, Mp, rp is the
vent. The mechanical impedance of 9, CF is the mechanical impedance of the front air chamber
11, CB is the mechanical impedance of the back air chamber 12, and Font is the output. In this
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equal node circuit, the vent hole 9 is connected in parallel to the output end as a mechanical
impedance represented by Mp + r p and between the function of the low cut filter and the
cavities of the front air chamber 11 and the back air chamber 12 Cause anti-resonance. The
example of the sound pressure frequency characteristic shown in FIG. 4 shows the influence of
the vent hole 9. 40 shows the sound pressure frequency characteristic when the vent hole 9 is
provided, 41 shows the sound pressure frequency characteristic in the case of the closed
configuration, 42 shows the low cut characteristic by the vent hole 9, and 42 shows the influence
of antiresonance by the vent hole 9.
In this speaker, the reproduction band can be extended to a high region by the vent holes 9 as
compared with the closed configuration. However, in the above configuration, since the vent hole
9 is formed on the diaphragm 2, the wiring of the voice coil lead wire 4 may block the vent hole
9 and Mp + r p may not be obtained. . In the case where the baffle plate 1 is in close proximity to
the sound emission hole 13 of the baffle plate 1, the disturbance of the sound pressure frequency
characteristic due to the sound pressure interference in the front air chamber 11 as shown in
FIG. The apparent volume of the V.sub.2 has a drawback that the frequency variation of the
antiresonance 43 is generated. SUMMARY OF THE INVENTION In view of the above-mentioned
drawbacks, the present invention secures the vents of the front air chamber 7 back air chamber,
realizes high-frequency reproduction, and does not give the directionality of the diaphragm, and
has an extremely high sound pressure frequency characteristic. It provides a stable speaker. In
order to achieve this object, the speaker of the present invention has a front air chamber formed
between the buckle plate and the diaphragm on the front surface of the diaphragm, while the
rear surface of the diaphragm is formed by the speaker housing A ventilating hole that
acoustically connects the front air chamber and the back air chamber by the buckle plate and the
recess provided on the inner peripheral surface of the speaker housing. As a result, high
frequency reproduction is realized, and the position of the through hole is determined by the
component parts, and the variation in the sound pressure frequency characteristic generated in
the production process is extremely reduced. Description of the Embodiments An embodiment of
the present invention will be described below with reference to the drawings. FIG. 5 is a crosssectional view of the speaker in an embodiment of the present invention. In FIG. 6, 51 is a buckle
plate, 52 is a diaphragm, 53 is a voice coil, 54 is a voice coil lead wire, 55 is a top plate, 56 is a
magnet plate, 5 is a center ball with a plate, and 58 is a speaker housing. . 61 denotes a front air
chamber, 62 denotes a back air chamber, 69 denotes a vent formed by a recessed portion
provided on the baffle plate 51 and the inner peripheral surface portion of the speaker housing
58 and guides the flow of air shown at 60. . A magnetic circuit consisting of a top play 55, a
magnet 56, and a center ball with a center ball 57 having a through hole at the center is fixed to
the inside of a speaker housing 58 formed of a nonmagnetic material such as resin. The voice
coil lead wire 54 is wired on the diaphragm 52 made of a non-air-permeable material such as a
resin film, metal foil, or the like, and the peripheral value portion of the vibration system
configured is fixed to the peripheral portion of the speaker housing 58. The voice coil 53 is held
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in the air gap of the magnetic circuit, and the back air chamber 62 is formed.
Furthermore, a baffle plate 51 having a sound output hole 63 on the front surface of the
diaphragm 52 is fitted with the speaker housing 58 to constitute a front air chamber 61. In the
speaker housing 68, a concave step 58a is provided on a part of the peripheral portion to which
the diaphragm 52 is fixed, and the baffle plate 51 is provided with a convex step 51a in which
the concave step 58aiC fits. The vent hole 59 is formed by defining the position at which the
baffle plate 51 and the speaker housing 58 are fitted and bonded. The operation of the Km
speaker as described above will be described below with reference to FIGS. 3, 4 and 6. FIG. In the
speaker of the configuration shown in FIG. 5, the vent hole 69 formed by the recess of the baffle
plate 61 and the recess of the speaker housing 58 has a parallel impedance lnp и rp phase in any
circuit shown in FIG. A relatively low-cut filter is configured, and high frequency antiresonance
can be obtained, and the speaker performance of the conventional example can be maintained.
Further, the vent hole 59 can be determined by the part shape so as to be disposed sufficiently
far to the sound emitting hole e3 of the baffle plate 51, and the positional relationship with the
voice fill lead wire 54 is also drawn out of the buckle plate 51 and the speaker housing 58 The
arrangement of the grooves makes it possible to maintain a constant distance. Thereby, as shown
in FIG. 6A, the disturbance of the sound pressure frequency characteristic shown in the
conventional characteristic 71 is reduced, and the variation of the antiresonance frequency in the
high region is also reduced. As described above, according to the present invention, the air
pressure holes between the front air chamber and the back air chamber are formed in the buckle
plate or the speaker housing, thereby maintaining the conventional sound pressure frequency
characteristics, and from the manufacturing point of view Characteristic variation can be
reduced, and its practical effect is that of dogs.
[0002]
Brief description of the drawings
[0003]
1 is a cross-sectional view of a conventional example speaker, FIG. 2 is a plan view of a vibration
system, FIG. 3 is an approximate equivalent circuit in use of the conventional example speaker,
and FIG. 4 is a sound pressure of the conventional example speaker FIG. 5 is a cross-sectional
view of an embodiment of the speaker according to the present invention, and FIG. 6 is a sound
pressure frequency characteristic according to an embodiment of the present invention.
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61 и и и и и и Baffle plate, 61a и и и и и и и и и и и и и и и и и и и и и moving plate, 63 и и и и и и и voice coil, 64 и и и и и и и
и и Lead wire, 56 top plate, 56 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и ии и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и Baffle plate Sound emission frequency of the speaker, 71 и и и и и и и
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и. Name of Agent Attorney Nakao Toshio Other 1 person ?
111 figure Fig. 2 figure 11 F; 77, 4 Figure 5 Figure 6
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