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DESCRIPTION JPH08205287

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DESCRIPTION JPH08205287
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electro-acoustic transducer for generating a sound by causing a flexural vibration by bonding a
piezoelectric ceramic plate to a metal substrate and inputting a voltage of a predetermined
frequency between the piezoelectric ceramic plate and the metal substrate. It is about
[0002]
2. Description of the Related Art In recent years, with the progress of high-density mounting of
electronic devices, there is a need for surface mounting compatible with various electronic
components which can be mounted while eliminating the need for drilling of printed wiring
boards of the devices. Expanded, the need for electro-acoustic transducers is strong.
[0003]
The following describes a conventional electroacoustic transducer.
FIG. 4 is a cross-sectional view showing an assembled piezoelectric sounding body as a
conventional electro-acoustic transducer mounted on a printed wiring board of an apparatus.
[0004]
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1
Reference numerals 21 and 22 denote an upper case and a lower case, respectively sandwiching
and storing a piezoelectric diaphragm to which a metal plate of 23 and a piezoelectric ceramic
plate of 24 are bonded, and in contact with terminals 25 and 26 to make electrical connection. It
is also pressed and held mechanically. In the upper and lower cases 21 and 22, the projections
30, 32 and the recessed grooves 29, 31 are engaged, and the terminals 25, 26 are engaged with
the case holes 27, 28 to form a piezoelectric sounding body. Then, the terminals 25 and 26 are
inserted into the holes 34 and 35 formed in the printed wiring board 33 of the device and
connected by the solders 36 and 37. A voltage signal of a predetermined frequency is applied to
the piezoelectric sounding body through the printed wiring board to generate flexural vibration
in the piezoelectric ceramic plate and the metal substrate to obtain generation of sound.
[0005]
According to the conventional example configured as described above, it is necessary to solder
the terminals 25 and 26 on the back surface of the printed wiring board. Therefore, both sides of
the printed circuit board of the apparatus were required for mounting of a piezoelectric sounding
body. In addition, it is necessary to form holes for inserting the terminals of the piezoelectric
sounding body on the printed wiring board of the device.
[0006]
Furthermore, in order to automatically mount the piezoelectric sounding body, it is necessary to
insert the end of the terminals 25 and 26 of the piezoelectric sounding body with the holes 34
and 35 of the printed wiring board facing each other. High processing accuracy is required for
processing, operation of an automatic machine, etc., and there are problems such as loss of
productivity.
[0007]
The present invention solves the above-mentioned conventional problems, and can be mounted
only on one side without requiring a mounting area on both sides on the printed wiring board of
the device, and it becomes possible to abolish the hole processing of the printed wiring board It
is another object of the present invention to provide an electro-acoustic transducer which can be
easily mounted on a printed wiring board.
[0008]
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[Means for Solving the Problems] In order to achieve the above object, the electroacoustic
transducer of the present invention comprises a piezoelectric diaphragm having a piezoelectric
ceramic plate bonded to a metal substrate and a U-shaped thin metal plate. And one end of the
lower case is repeatedly bent, and is fixed by being sandwiched between the lower case mounted
with a pair of elastic terminals and the upper case.
[0009]
[Function] With this configuration, surface mounting connection can be performed by means of a
pair of terminals exposed on the outer surface by sandwiching a U-shaped portion on the outer
peripheral side wall of the lower case. Is unnecessary, and the piezoelectric sounding body can be
attached only on one side of the printed wiring board.
[0010]
An embodiment of the present invention will be described below with reference to the drawings.
[0011]
FIGS. 1 to 3 show an electroacoustic transducer according to an embodiment of the present
invention.
1 is an exploded perspective view, FIG. 2 is an assembled cross-sectional view cut in the XX
direction in FIG. 1, and FIG. 3 is a cross-sectional view cut in the YY direction in FIG.
[0012]
Reference numeral 1 denotes a metal substrate, and a piezoelectric ceramic plate 2 is bonded to
the back surface to form a piezoelectric vibration plate 3.
Reference numeral 5 denotes an upper case, which is a concave groove 4 larger than the outer
shape of the piezoelectric diaphragm, a hole (sound emitting hole) 15 for emitting a
predetermined sound, and notches 16 and 17 for arranging terminals 9 and 12 described later
(FIG. Not shown).
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7 is a lower case, 6 is a convex portion, and 18 and 19 are grooves formed by cutting a part of
the 6 convex portion.
Reference numerals 9 and 12 denote terminals formed of a thin metal substrate, and U-shaped
bent portions 10 and 13 are provided with return bending portions 11 and 14, respectively.
The piezoelectric diaphragm 3 is supported by the concave groove 4 of the upper case 5 by the
above component configuration, and is sandwiched by the convex portion 6 of the lower case 7.
The U-shaped terminal is clamped and held on the outer peripheral side wall of the lower case 7
at the U-shaped bent portions 10 and 13 by the elastic force of metal. After assembly, the bent
portion 11 of the U-shaped terminal 9 is brought into contact with the piezoelectric ceramic plate
with spring pressure, and the other bent portion 12 has its repeated bending portion 14 formed
of the metal substrate 1 And contact with the spring pressure. The upper case 16 is a groove
formed on the inner wall and is engaged with the lower case's projection 8.
[0013]
When mounting the electro-acoustic transducer of the present invention completed with the
above configuration, the portions exposed from the case outer peripheral side walls of the Ushaped terminals 9, 12 become the soldered portions with the application wiring board of the
device. It can be mounted only on the front side of the board.
[0014]
Further, in the present embodiment, the terminal 9 and the terminal 12 can be mounted in the
completely same shape, and standardization and sharing of parts are performed.
[0015]
As described above, according to the present invention, the U-shaped terminal having repeated
bending portions is disposed between the upper case and the lower case and a part of the surface
is exposed from the outer periphery of the case. It is used as a solder connection to a printed
wiring board, and its effects are described below.
[0016]
(1) A piezoelectric sounding body is disposed on one side of a printed wiring board of an
apparatus, and connection such as soldering of terminals becomes possible, so high density
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mounting can be realized.
[0017]
(2) The printed wiring board of the device does not need to process the terminal insertion hole of
the piezoelectric sounding body, and the processing cost of the printed wiring board can be
reduced and the mounting accuracy when arranging the piezoelectric sounding body on the
printed wiring board is The automatic insertion is facilitated because the terminal insertion holes
are not restricted.
[0018]
(3) By repeatedly bending the terminal, the terminal can have sufficient elasticity, and high
reliability can be realized for the contact of the piezoelectric diaphragm.
[0019]
Although an example of a sound generator, ie, a speaker has been described in the embodiment,
any other electro-acoustic transducer using a piezoelectric element is the same, and can be
applied to a microphone for converting sound into an electric signal. It is.
[0020]
Brief description of the drawings
[0021]
1 is an exploded perspective view of an embodiment of the present invention
[0022]
2 is a cross-sectional view of an embodiment of the present invention
[0023]
3 is a cross-sectional view of an embodiment of the present invention
[0024]
Fig. 4 Cross section of the conventional electroacoustic transducer
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[0025]
Explanation of sign
[0026]
Reference Signs List 1 metal substrate 2 piezoelectric ceramic plate 5 upper case 7 lower case 9
U-shaped terminal 11 repeated bending portion 12 U-shaped terminal 14 repeated bending
portion
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