close

Вход

Забыли?

вход по аккаунту

?

JPH01233493

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 JPH01233493
[0001]
t! The present invention relates to, for example, a piezoelectric buzzer, such as a piezoelectric
buzzer, which outputs a sound by applying a drive voltage to a piezoelectric element, for
example. [Gear] Support FIG. 6 is a cross-sectional view of a typical prior art of a piezoelectric
buzzer as an example of a piezoelectric sounder. The piezoelectric buzzer 1 includes a bottomed
cylindrical resin case 2 opened at one end (left end in FIG. 6), a cover 3 attached to cover the
opening of the resin case 2, and the resin case 2. The diaphragm 5 to which the piezoelectric
element 4 is attached in a face-up direction on the cover 3 side, the metal terminal 6 a
electrically connected to the piezoelectric element 4, and the metal terminal 6 b electrically
connected to the diaphragm 5 And. At the bottom of the resin gate 2, a sound emitting hole 7 is
formed, and a stepped portion 8 with which the peripheral portion of the diaphragm 5 abuts is
formed. The diaphragm 5 has its peripheral edge portion fixed by the stepped portion 8 and the
two end faces of the cover 3. Thus, the resonance space 9 is formed by the diaphragm 5 and the
resin case 2. Further, one end of the metal terminal 6a is in a space 9a defined by the cover 3
and the diaphragm 5, and is elastically in contact with the piezoelectric element 4 by its elastic
force, and the metal terminal 6a is The other end is pulled out through the insertion hole 10 a of
the cover 3. Similarly, the other metal terminal 6b has one end in the space 9a defined by the
cover 3 and the diaphragm 5, and elastically contacts the diaphragm 5 by its elastic force, and
the other end is The insertion hole 10b of the cover 3 is inserted and pulled out to the outside. In
such prior art, it is necessary to insert the diaphragm 5 into the case 2 for assembly and then
insert the cover 3 for assembly, so the metal terminals 5a and 5b are inserted and fixed to the
cover 3 in advance. There must be. Therefore, the assembly operation is complicated. In addition,
this prior art requires the cover 3 and accordingly, the number of parts increases accordingly.
FIG. 7 is a cross-sectional view of another prior art piezoelectric buzzer. The piezoelectric buzzer
11 has a bottomed cylindrical resin case 12 open at one end, and a diaphragm 14 in which the
04-05-2019
1
piezoelectric element 13 is attached to the surface of the resin case 12 on the outer side while
covering the opening of the resin case 12. , A metal terminal 15 a electrically connected to the
piezoelectric element 13, and a metal terminal 15 b electrically connected to the metal plate 14.
A sound release hole 7 a is formed at the bottom of the resin case 12. The diaphragm 14 is fixed
to the resin case 12 by an adhesive 19 at its peripheral portion, whereby a resonance space 16 is
formed by the diaphragm 14 and the resin case 12.
Further, the portion 17a of the metal terminal 15a is press-fit into the side wall of the resin case,
and the portion 9 l 8 a of the metal terminal 15a extends toward the inner side of the resin case
12 and its tip is soldered And fixed to the piezoelectric element 13. Another metal terminal 15b
also has the same configuration as the metal terminal 15a, and the portion 17b is press-fit onto
the side wall of the resin case 12, and the portion 18b is directed to the inner side of the resin
case 12 The tip is soldered and fixed to the diaphragm 14. In such prior art, although the number
of parts is reduced by the amount not using the prior art ratio cover 3 shown in FIG. 6, fixing of
the diaphragm 14 to the resin case 12 must use an adhesive. Also, since the contacts to the
piezoelectric elements 13 and the diaphragm 14 of the metal terminals 15a and 15b are exposed
to the outside, soldering is required to prevent sticking and dust entering during assembly work,
and accordingly Processing steps are increased. ■ (X1 tongue) In summary, in the prior art, the
cost is high due to the increase in the number of parts, the complexity in the assembly operation
and the increase in the number of processes, etc. It had become. SUMMARY OF THE INVENTION
The object of the present invention is to solve the above-mentioned technical problems, to enable
a mounting operation from one direction and realize cost reduction, with a small number of parts
and without requiring a complicated processing step. It is providing a piezoelectric sounder. The
present invention for i ° comprises a diaphragm having a piezoelectric element attached to one
surface thereof, and a resin case for fixing the diaphragm, and a metal terminal electrically
connected to the piezoelectric element and the diaphragm. In the piezoelectric sounder
configured to apply a drive voltage to the piezoelectric element, the resin case has a bottomed
cylindrical shape with one end open, and a terminal receiving groove is formed on the side wall
of the resin case. The metal terminal is inserted into the insertion groove of the terminal holder,
the large end is extended to the outside, the other end is extended into the resin case, the
diaphragm covers the opening of the resin case, and the resin case is And the other end of the
metal terminal is in resilient contact with the piezoelectric element and the diaphragm,
respectively. According to the configuration, the terminal receiver formed on the side wall of the
resin case is inserted into the insertion groove and the metal terminal is attached to the resin
case, and the diaphragm is fixed to the resin case in such a state Thus, the piezoelectric sounder
according to the present invention can be assembled.
Therefore, only a working process from one direction is required, and since complicated bonding
and soldering do not have processing, it is possible to easily realize an automatic assembly
04-05-2019
2
operation. In addition, it is not necessary to put a cover etc. on the resin case, so the number of
parts can be reduced. Example 1-Example-Fig. 1 is a cross-sectional view of a piezoelectric buzzer
as one embodiment of a piezoelectric sawer according to the present invention, and Fig. 2 is a
plan view seen from the arrow mark A of Fig. FIG. 3 is a side view seen from the arrow mark B
side of FIG. In this piezoelectric buzzer 20, a disk-like piezoelectric element 22 is attached to a
bottomed cylindrical resin case 21 having an open at one end and a surface facing the inner side
of the resin case 21, and the opening of the resin case 21 is It has a disc-shaped diaphragm 23
attached to cover, a metal terminal 24a electrically connected to the piezoelectric element 22 and
elasticity, and a metal terminal 24b electrically connected to the diaphragm 23 and elastic. The
resin case 21 has a bottom portion 21a and a side wall 211), and a caulking fixing portion 25 is
formed at the upper end portion of the side wall 21t) in FIG. The peripheral edge portion of the
diaphragm 23 is fixed by caulking by the caulking fixing portion 25. Further, the side walls 211)
611 of the resin case 21 have a pair of terminal receiving grooves 2 (i. 27 are formed, and the
terminal receiving grooves 26 and 27 are disposed on one diameter line of the bottom 21a. In
this terminal receiver, a sound output hole 28 is formed by the insertion groove 26 and the
diaphragm 23. Also, the other terminal receiver comprises a sound emission hole 29 by the
insertion groove 27 and the diaphragm 23. The metal terminal 24a is bent by about 90 degrees
and the free end thereof is pulled out to one part through the notch 2G, and the bent part 50al is
connected to obtain a suitable elasticity and connection. The elastic portion 51a is narrower than
the bent portion 50a. The elastic portion 51 a is in the resonance space 30 defined by the
diaphragm 23 and the resin case 21, and the tip end of the elastic portion 51 a resiliently abuts
on the piezoelectric element 22 (7). The other metal terminal 24b also has the same
configuration as that of the metal terminal 24a, and the corresponding portions are indicated by
adding a subscript 1 !. The elastic portion 51 b of the metal terminal 24 b is in the resonance
space 30, and the tip thereof resiliently abuts on the diaphragm 23. The metal terminals 24a and
24b are fixed by caulking by caulking fixing portions 313.311) of the bottom 21a. The metal
terminals 24a and 24b may be fixed not by caulking but by other fixing methods.
In the piezoelectric buzzer 2o having such a configuration, when a drive voltage is applied to the
piezoelectric element 22 through the metal terminals 24a and 24b, the diaphragm 23 vibrates in
a vibration mode such as a thickness longitudinal vibration mode, and the sound wave resonates.
It is emitted into the space 30. In the resonance space 3o, the resonance 1 at a constant
resonance frequency is sent to the outside through the sound emission holes 28 and 29, and the
buzzer is thus ringed. In the terminal holder, the opening dimension 1 '71 (see FIG. 3) of the
insertion groove 26. 27 is selected to have a value corresponding to a predetermined resonance
frequency 6, two. Next, the assembling operation of the piezoelectric buzzer 2 having such a
configuration will be described. First, as shown in FIG. 4, a resin case 21 having an annular
convex portion 35 formed on the upper end surface of the side wall 21b is prepared. In this resin
case 21, the terminal receiving groove 26.27 is formed in advance and then the metal terminal
24a. Attach 24b to bottom 21a. That is, the metal terminals 24a and 24b are partially bent in
04-05-2019
3
advance by 90 degrees, and the bent portions 50a and 50b are inserted into the terminal holder
/ NP 26.27 (7, bent portion 5 ° a The caulking fixing portions 31a and 31b are inserted into the
mounting holes 32a and 32b (see FIG. 1) formed in the first and second portions 50b and 50b.
Thereafter, the caulking fixing portions 31a and 31b are heated and pressurized to caulk. The
metal terminals 24a, 24t) are fixed to the bottom 21a of the resin case 21. In this state, the tips
of the elastic portions 5ja and 51b of the metal terminals 24a and 24b extend in the direction of
the opening of the resin case 21. Next, with the piezoelectric element 22 facing the bottom 21a
in such a state, the peripheral portion of the vibration 'tJi, 23 is temporarily fixed to the step
portion 60 (see FIG. 4) of the resin case 21. Then, the convex portion 35 of the resin case 21 is
heated and pressurized. As a result, the convex portion 35 is thermally deformed as shown in
FIG. 1 to form the caulking fixing portion 25 and fix the peripheral portion of the diaphragm 23.
After the operation from one direction, the piezoelectric buzzer 20 shown in FIG. 1 is assembled.
The convex portion 35 may be partially caulked to fix the resin case 21 and the diaphragm 23
(or the diaphragm 23 may be fixed to the resin case 21 by a screw or the like). The metal
terminals 24a and 24 may be assembled using the continuous hoop-like terminal 70 as shown in
FIG. 5, which makes it possible to perform continuous production. Although the caulking fixing
portions 25.31a and 31b are heat-sealed in the above-described embodiment, they may be
ultrasonically welded and processed in a short time.
In the above embodiment, the sound output holes 28 and 29 are formed on the side wall 21b of
the resin case 21 with the terminal receivers serving also as the insertion grooves 26.27, but
they may be separately formed separately on the side wall 21b. It may be formed on the bottom
21 a of the resin case 21. Further, although the piezoelectric buzzer has been described in the
above embodiment, the present invention can be suitably applied to a sound generator or the like
that emits a sound by using other piezoelectric elements. According to the present invention, the
following effects can be obtained according to the present invention, as in the case of a training
course. ■ It does not require a cover as in the prior art, thus reducing the number of parts.
{Circle over (2)} Since the metal terminal and the diaphragm and each contact of the metal
terminal and the piezoelectric element are in the resonance space, it is not necessary to solder
the contacts as in the prior art. In the piezoelectric sounder according to the present invention,
the metal terminal may be inserted and fixed to the resin case in the assembly, and then the
diaphragm may be inserted and fixed, and the assembly can be performed continuously in one
direction. It is possible to do.
[0002]
Brief description of the drawings
[0003]
04-05-2019
4
1 is a cross-sectional view of a piezoelectric buzzer according to an embodiment of the
piezoelectric sounder according to the present invention, FIG. 2 is a plan view seen from the side
of arrow A in FIG. 1, and FIG. Side view seen from the side, FIG. 4 is a perspective view of the
resin case at the time of assembly, FIG. 5 is a plan view of the continuous hoop-like terminal 70
used at the time of assembly of the metal terminals 24a, 24b, FIG. And FIG. 7 is a cross-sectional
view of another prior art.
20: Piezoelectric buzzer, 21: resin case, 21'a: bottom of resin case, 21b: side wall of resin case,
22: piezoelectric element, 23: diaphragm, 24a, 24b · · · metal terminals, 26.27 · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 30. Patent applicant: Murata
Manufacturing Co., Ltd. Fig.1 Fig.2 Fig.3 Fig.4 Fig.4 Fig.5 /
04-05-2019
5
Документ
Категория
Без категории
Просмотров
0
Размер файла
14 Кб
Теги
jph01233493
1/--страниц
Пожаловаться на содержимое документа