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DESCRIPTION JPH06291819

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DESCRIPTION JPH06291819
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
piezoelectric receiver comprising a piezoelectric element mounted inside a receiver of a handset.
[0002]
2. Description of the Related Art A handset using a piezoelectric element is used in a portable
telephone, a cordless horn and the like. The piezoelectric element generally has a piezoelectric
film formed on one side or both sides of a diaphragm made of a metal disk, and an electrode
formed on the surface of the piezoelectric film. Such a piezoelectric element is mounted in a case,
which is in turn incorporated inside the handset of the handset of the handset.
[0003]
FIG. 4 shows the structure of a conventional general receiver, and a receiver 14 of a handset 1 is
provided with a sound outlet 14, and a case support which is cylindrically erected inside the
sound outlet 14. Sixteen are formed. Then, a case 15 incorporating a piezoelectric element is
attached to the inside of the case support portion 16. Lead wires 10 respectively connected to
the diaphragm and electrodes of the piezoelectric element mounted in the case 15 are drawn out
from the case 15, and the lead wires 10 are not shown in the drawing via the connector 13.
Connected to the electric circuit of
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1
[0004]
However, this conventional piezoelectric receiver has the following problems. First, in order to
incorporate the piezoelectric element into the case 15 and to further incorporate the case 15 into
the handset 1, it is necessary to have room to incorporate the case 15 into the handset in
addition to the margin for incorporating the piezoelectric element into the case 15. It is difficult
to miniaturize. Second, since the number of parts is large and the process of incorporating the
case 15 into the handset is required in addition to the process of incorporating the piezoelectric
element into the case 15, the number of assembly processes is increased, making it difficult to
reduce the manufacturing cost . Thirdly, the gap between the case support 6 and the case 15 of
the handset 1 in the assembled state, so-called backlash, makes the transmission of sound from
the piezoelectric element through the case 15 to the handset 1 uniform. It is difficult for the
acoustic characteristics of the sound emitted from the sound outlet 14 to be constant. That is,
variations in acoustic characteristics are likely to occur depending on individual products.
[0005]
SUMMARY OF THE INVENTION In view of such conventional problems, the present invention has
an object to provide a piezoelectric receiver in which downsizing and cost reduction can be easily
achieved, and constant acoustic characteristics can be obtained.
[0006]
According to the present invention, in order to achieve the above object, in the piezoelectric
receiver having the piezoelectric element 7 attached to the inside of the receiver of the handset
1, the recess 2 in the receiver of the handset 1 And the step 3 is formed in the middle of the
recess 2 and the piezoelectric element 7 is accommodated in the recess 2 and the peripheral
portion of the diaphragm 8 of the piezoelectric element 7 is held in the step 3 A piezoelectric
handset characterized in that 2 is closed by a lid.
[0007]
Here, when the recess 2 is opened on the front surface of the handset 1, the opening of the
recess 2 can be closed by the earpiece 12.
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When the recess 2 is opened to the inside of the handset 1, the opening of the recess 2 can be
closed by the cover plate 17.
[0008]
In the piezoelectric receiver according to the present invention, the recess 2 is formed in the
handset 1 without using a case, the piezoelectric element 7 is directly accommodated therein,
and the periphery of the piezoelectric element 7 is supported by the step 3 of the recess 2
Therefore, the number of parts can be reduced by at least the amount of the case, and the
number of steps for incorporating the piezoelectric element 7 in the case can be eliminated.
Further, since the piezoelectric element 7 which is a sound source is directly supported by the
handset 1, the sound generated by the piezoelectric element 7 is uniformly transmitted to the
handset 1. Therefore, constant acoustic characteristics with no variation can be obtained in any
of the products.
[0009]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be
described in detail with reference to the drawings. FIGS. 1 and 2 show the receiver of the handset
1. In the front of the receiver, there are formed recesses 3 recessed in three steps. That is, at the
center of the deepest portion of the concave portion 2, a sound emission port 6 is opened, and a
damper 5 made of a tetron mesh or the like of about # 380 is stretched here.
[0010]
A step 3 is formed between the deepest portion and a middle portion having a larger diameter,
and the diameter of the middle portion is slightly larger than the diameter of the diaphragm 8 of
the piezoelectric element 7. A hole 11 for passing the lead wire 10 of the piezoelectric element 7
is provided on the outer peripheral wall of the middle step. Furthermore, the outermost shallow
part whose diameter is larger than the middle part is the earpiece storage part 4. The three-step
concave portion is formed by means such as resin molding integrated with the handset 1.
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3
[0011]
The piezoelectric element 7 has a piezoelectric film 9 formed on one side (the lower surface in
FIGS. 1 and 2) of a diaphragm 7 made of a metal disk or the like, and an electrode formed on the
surface of the piezoelectric film 9. Lead wires 10 are connected to the electrode surfaces of the
diaphragm 8 and the piezoelectric film 9 respectively, and a connector 13 is connected to the tip
of the lead wires 10.
[0012]
The piezoelectric element 7 is housed in the stepped portion 3 of the recess 2 with the
piezoelectric film 9 side facing the damper 5, and the peripheral portion of the diaphragm 9 is
adhered and fixed onto the stepped portion 3 with a silicone adhesive or the like. Ru.
Furthermore, the lead wire 10 is pulled out of the hole 11 to the outside of the recess 2 and
connected to a circuit (not shown) provided inside the handset 1 through the connector 13. In
general, silicone resin or the like is embedded in the holes 11 to seal the recess 2.
[0013]
In this embodiment, an earpiece 12 separate from the handset 1 is provided. The earpiece 12 is a
disc-like member made of a resin molding similar to the handset 1 having a slightly thin central
portion, and the sound emission port 14 is opened at the thinnest central portion. The earpiece
12 has a diameter slightly smaller than the diameter of the earpiece storage portion 4 of the
recess 2, and is fitted into the earpiece storage portion 4 and fixed with an adhesive, doublesided adhesive tape or the like. Thereby, the opening of the recess 2 is closed by the earpiece 12.
It is also possible to cut male and female screws respectively corresponding to the peripheral
surface of the earpiece 12 and the peripheral surface of the earpiece storage portion 4 of the
handset 1 and screw the earpiece 12 to the earpiece storage portion 4 with this screw. Good.
[0014]
Next, the embodiment shown in FIG. 3 will be described. Here, the point that the recess 2 is
opened to the inside of the receiving section of the handset 1 is different from the above
embodiment. The recessed portion 2 has two steps, and the peripheral portion of the diaphragm
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9 of the piezoelectric element 7 similar to that of the above embodiment is adhered and
supported by the stepped portion 3 which is the stepped portion. Furthermore, the opening of
the recess 2 is closed by a cover plate 17 formed of a resin disk similar to the handset 1, and the
cover plate 17 is fixed to the handset 1 by, for example, an adhesive or double-sided adhesive
tape. ing. A sound emission port 6 is opened at the center of the cover plate 17, and a damper 5
made of a Tetron mesh of about # 380 is stretched there. The lid plate 17 can be screwed in the
same manner as described for the earpiece 12 of the embodiment.
[0015]
As described above, according to the present invention, the number of parts can be reduced and
the number of assembling steps can be reduced, which is advantageous for downsizing and cost
reduction. Furthermore, since the piezoelectric element that is the source of sound is directly
supported by the handset, certain acoustic characteristics are obtained.
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