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JPS6392200

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DESCRIPTION JPS6392200
[0001]
Technical Field> The present invention relates to an answerback speaker provided with a sensor
for monitoring the operation of a horn speaker. <Prior Art> The answerback speaker is further
improved in speaker characteristics in order to detect a break in the voice coil, or to prevent
broadcast and wide area broadcast radio jacks, and to intercept broadcast contents of the radio
jacks. (For being used for There are the following types of conventional answerback speakers. As
shown in FIG. 4, the voice coil 3 and the detection coil 4 are connected in series to the
transformer 102 secondary side fill 2 of the speaker, and the output of the detection coil 4 is
output through the amplifier 5 as shown in FIG. This scheme has the disadvantage of causing
losses due to the detection coil 4. In the second method, as shown in FIG. 5, the microphone 7 or
the detection speaker 8 is disposed in front of the speaker 6 so as to face the speaker, and an
output is obtained from the microphone 7 or the speaker 8. Although this system is a reliable
system to monitor the operation of the speaker 6, not only is the microphone 7 or the speaker 8
expensive, but a mounting base for the microphone 7 or the speaker 8 must be installed, which is
expensive. ? こなる。 The third one is to wind the detection coil 11 together with the operation
coil 10 around the voice fill point 9 of the speaker as shown in FIG. In this case, since the
detection coil 11 is a load, a loss occurs and the acoustic characteristic is deteriorated. In the
fourth example, as shown in FIG. 7, a sound path 16 is provided which is branched to the sound
path 14 connecting the driver unit element 12 and the horn 13 to reach the detection
microphone 15. In this case, since the shape of the sound path 14 becomes complicated, the
acoustic characteristics deteriorate. OBJECTS OF THE INVENTION The present invention is to
provide a novel structure without the various drawbacks of the above-described conventional
server. Moreover, it is comprised only by adding one component, without changing the structure
of the conventional speaker a lot. Therefore, the structure is simple, inexpensive, and a faithful
detection signal is to be obtained. <Summary of the Invention> In the present invention, a
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1
piezoelectric reflector element for converting a pressure change into an electric signal is
disposed at a position to which back pressure of the diaphragm is applied on the rear side of the
diaphragm to monitor four speakers. Example 1 In FIG. 1 (a), 21 is a throat, 22 is an equalizer, 23
is a diaphragm, 24 is a bridge, 25 is a magnet, 26 is a unit case, 27 is a bottom plate, 28 is a
center piece, 29 is a center ball, 30 is a terminal, and 32 is a voice coil bobbin.
The configuration of each of the above-mentioned parts is well known, and in the driver unit
having the above-described configuration, which is assembled as shown in FIG. 1 to configure the
driver unit of the horn speaker, behind the diaphragm 23 above the center piece 28. Several
phrases can be made in the piezoelectric rope 31 at opposite positions. The piezoelectric element
31 is formed in a circular shape as shown in FIG. 1 (b), and its peripheral edge is supported by a
support 33, and the support 33 is adhered to the center piece 28 with an adhesive. The
piezoelectric element 31 receives air vibration on the back side of the diaphragm 23, vibrates,
and outputs an electric signal. The first embodiment is extremely simple in structure because it
merely adds the piezoelectric element to the center piece without deforming the conventional
driver unit. Since this embodiment is disposed close to the rear of the diaphragm, a sufficiently
large level of output can be obtained from the piezoelectric element. Embodiment 2 In the same
driver unit as shown in Embodiment 1, the piezoelectric element 31 is attached to the back
surface of the bottom plate 27 as shown in FIG. 2 (a). As in the first embodiment, the support 33
on the peripheral edge of the piezoelectric rudder 31 is adhered to the bottom plate 27 with an
adhesive. In this embodiment, the vibration behind the diaphragm 23 is transmitted to the
piezoelectric element 31 through the center piece 28, the center ball 29, and the bottom plate 27
to obtain an electric signal output. Sound pressure frequency characteristics when the driver unit
of FIG. 2 (a) is coupled to a straight horn are shown in FIG. 2 (curve A of 121). Curve B in FIG. 2
(b) shows the output of the piezoelectric element 31 at the time of 1-watt input. As can be seen
from the curve B, the output of the piezoelectric element 31 is sufficiently large and the
frequency range is wide, and a clear audio output can be obtained. Furthermore, as a reference,
the curve C of FIG. 2 (b) is a speaker 45 of this embodiment and another normal horn speaker 46
without answer back as shown in FIG. 2 (C), with a mounting angle of 90 °. The output of the
piezoelectric element 31 of the speaker 45 is shown when the horn interval S is fixed to 43CrrL
and the word is input to the speaker 46 one word at a time. The curve C has a small level and a
narrow bandwidth. Therefore, it can be understood that the piezoelectric element 31 of the
speaker of the present invention is not influenced by the external speaker or is not vibrated. 42
(b), the zero level of curve A is 4 dB, and that of curves B and C is 46 dBV. Also in the case of the
second embodiment, the piezoelectric element 31 may be attached to the bottom plate 27 by
utilizing the distance between the bottom plate 27 and the unit case 26, so that the structure is
simple and the load on the speaker is not It does not adversely affect the acoustic and electrical
characteristics.
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2
Third Embodiment In the case of this embodiment, as shown in FIG. 3 (a), a through hole 35 is
penetrated through the center of the center piece 28, the center ball 29, and the bottom plate 27
which constitute the speaker driver. In the space 36 between the bottom plate 27 and the unit
case 26, the piezoelectric element 390 peripheral support 40 is fixed between two ring-like
sponge-like elastic bodies 37 and 380. Fixing of each portion of the elastic body 37.38 and the
support 40 is suitably performed by bonding. In this embodiment, the back pressure of the
diaphragm 23 is applied to the piezoelectric element 39 through the through hole 35 and
converted into an electrical signal. Sound pressure frequency characteristics when the driver unit
of FIG. 3 (a) is coupled to a straight horn are shown by curve A of FIG. 3 (b). Curve B in FIG. 3 (b)
shows the output of the piezoelectric element 39 at 1-watt input. As can be seen from the curve
B, the output level of the piezoelectric element 39 is sufficiently large and the frequency range is
wide, and a clear audio output can be obtained. Furthermore, curve C in FIG. 3 shows a reference
toss, fixing the speaker of this embodiment and another ordinary horn speaker without
answerback at a mounting angle of 90 °, fixing the horn spacing S to 43 cm, and 1 watt to
another loudspeaker The output of the piezoelectric element when input is shown. The curve C
has a small level and a narrow bandwidth. Therefore, the piezoelectric element of the speaker of
the present invention is not influenced by another speaker or vibrated. In FIG. 13 (b), the zero
level of curve A, 4 dB 1 curve B, and curve C of Nocer vherha-46 dB V are shown. In the case of
the third embodiment, the through hole 35 is formed in the rear of the diaphragm 23 to increase
the capacity of the rear air chamber, so the characteristics of the speaker are improved. <Effect of
the Invention> The present invention mounts a very thin piezoelectric element at a position
where the back pressure of the diaphragm is applied in the driver unit of the speaker, so that the
output frequency characteristics and the electrical characteristics of the speaker are not
sacrificed. Installation is easy and does not complicate the structure 0
[0002]
Brief description of the drawings
[0003]
FIG. 1 (a) is a cross-sectional view of an answerback speaker according to an embodiment of the
present invention, and FIG. 1 (b) is a perspective view of a piezoelectric element.
2 (a) is a cross-sectional view of the loudspeaker according to the second embodiment of the
present invention, FIG. 2 (b) is a frequency characteristic diagram, and FIG. 2 (c) is for explaining
the characteristics of FIG. 2 (b). FIG. 3 shows a cross-sectional view of a loudspeaker according to
a third embodiment of the present invention, and FIG. 3 (b) shows a frequency characteristic
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diagram. 4 to 7 are schematic diagrams showing the configuration of the conventional answer
back speaker, respectively.
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