close

Вход

Забыли?

вход по аккаунту

?

DESCRIPTION JPH04365298

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH04365298
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
piezoelectric handset for use in a handset such as a telephone or an interphone.
[0002]
2. Description of the Related Art A conventional piezoelectric handset has a structure as shown in
FIG. That is, the front and back of the piezoelectric diaphragm 3 in which the piezoelectric
ceramic plate 1 is bonded to the metal substrate 2 is sandwiched between the front case 4 and
the rear case 5, and further between the piezoelectric diaphragm 3 and the rear case 5 A shockabsorbing material 6 is supported which uniformly supports the piezoelectric diaphragm 3 and
maintains the airtightness of the back air chamber. In addition, an acoustic resistance material 7
is fixed to the rear case 5 to control the resonance of the piezoelectric diaphragm 3 and flatten
the frequency characteristic, and the lead wire 8 is connected to the piezoelectric diaphragm 3.
Here, 9 is a sound release hole, and 10 is a leak hole.
[0003]
However, in the above-described conventional configuration, the resonance of the piezoelectric
diaphragm and the shock-absorbing material 5 that uniformly supports the piezoelectric
diaphragm and maintains the airtightness of the back air chamber is obtained. There is a problem
in that the cost is increased because two parts with the acoustic resistance material 6 are
required to brake and flatten the frequency characteristic.
13-04-2019
1
[0004]
The present invention solves the above-mentioned conventional problems, and has a buffer effect
to support the piezoelectric diaphragm uniformly and to maintain the airtightness of the back air
chamber in the space between the piezoelectric diaphragm and the back case, An object of the
present invention is to provide a low-cost piezoelectric receiver with a small number of parts by
realizing the acoustic resistance effect of damping the resonance of the piezoelectric diaphragm
and flattening the frequency characteristics with one component.
[0005]
SUMMARY OF THE INVENTION In order to achieve the object, a piezoelectric receiver according
to the present invention has a structure in which a porous foam is sandwiched between a support
portion and a space between a piezoelectric diaphragm and a back case. ing.
[0006]
[Operation] With this configuration, the porous foam absorbs variations in the caulking pressure
to uniformly support the piezoelectric diaphragm, and the airtightness of the back air chamber is
achieved by closely adhering between the metal substrate and the back case. Furthermore, since
the microvoids of the porous foam in the back air chamber act as an acoustic resistance material,
and the amount of acoustic resistance is determined by the opening area of the leakage port
opened in the back case, the resonance of the piezoelectric diaphragm Damping and flat
frequency characteristics, and by only inserting the porous foam between the piezoelectric
diaphragm and the back case, the work of fixing the acoustic resistance material can be omitted,
providing a low-cost piezoelectric receiver. can do.
[0007]
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a cross-sectional view of a piezoelectric receiver according to an embodiment of the
present invention.
In FIG. 1, the outer peripheral portion of the piezoelectric diaphragm 13 in which the
piezoelectric ceramic plate 12 is bonded to the metal substrate 11 is sandwiched between the
13-04-2019
2
front case 14 and the rear case 15, and the lead wire 16 is connected to the voltage diaphragm
13. It is done.
Furthermore, a sponge-like porous foam 17 such as urethane foam as an acoustic resistance
material is sandwiched between the support portion and the space between the piezoelectric
diaphragm 13 and the back case 15, and this porous foam 17 has a buffer effect. It has an
acoustic resistance effect.
Further, reference numeral 18 denotes a sound release hole provided in the front case 14, and
19 denotes a leak hole provided in the rear case 15.
[0008]
As described above, according to the present invention, the porous foam absorbs variations in
caulking pressure to support the piezoelectric diaphragm uniformly, and also adheres closely
between the metal substrate and the back case. A buffer effect that maintains the airtightness of
the back air chamber and an acoustic resistance effect in which the microvoids of the porous
foam of the back air chamber act as an acoustic resistance material can be realized with one
component, and further, the porous foam Since only sandwiching between the piezoelectric
diaphragm and the rear case, the work of fixing the acoustic resistance material can be omitted,
and a low-cost and excellent piezoelectric receiver can be realized.
[0009]
Brief description of the drawings
[0010]
1 is a cross-sectional view of a piezoelectric receiver according to an embodiment of the present
invention FIG. 2 is a cross-sectional view of a conventional piezoelectric receiver
[0011]
Explanation of sign
[0012]
Reference Signs List 11 metal substrate 12 piezoelectric ceramic plate 13 piezoelectric
diaphragm 14 front case 15 rear case 16 lead wire 17 porous foam 18 sound output hole 19
13-04-2019
3
leak hole
13-04-2019
4
Документ
Категория
Без категории
Просмотров
0
Размер файла
10 Кб
Теги
description, jph04365298
1/--страниц
Пожаловаться на содержимое документа