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JPS6265598

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DESCRIPTION JPS6265598
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
piezoelectric film or plaster used for alarms of watches, calculators, microwave ovens, toys, etc.,
switch confirmation and the like. 2. Related Art A conventional piezoelectric speaker is obtained
by attaching a piezoelectric element to a metal plate and soldering a lead wire to each. Problems
to be solved by the invention In such a conventional configuration, it is difficult to directly attach
to a printed circuit board or the like, and it is necessary to connect the lead wire and the terminal
of the device, and it takes time for assembly. In addition, the wire was unreliable, such as
breakage of the lead wire. Therefore, it is an object of the present invention to provide a
piezoelectric sounding body which can be directly attached to a printed circuit board without the
above-mentioned drawbacks and which is excellent also in the process and reliability due to the
unnecessary lead wire. is there. Means for Solving the Problems In order to achieve this object,
the piezoelectric sounding body of the present invention has a plurality of terminal portions
which are integral with the metal plate to which the piezoelectric element is adhered and which
project substantially radially from the plane thereof. And 3 bases of insulator on at least one of
the terminals. In order to electrically connect a terminal having a contact point, to electrically
connect the contact point and the piezoelectric element, and to further improve the sound
pressure on the metal plate, a resonance plate is attached. Operation With this, the terminal and
the terminal portion can be directly mounted on the printed circuit board, the number of
assembling steps is small, and the reliability is also high. In addition, since it can be mounted on
the printed circuit board in the vertical direction, the mounting can be made smaller in space.
Embodiment An embodiment of the present invention will be described below with reference to
FIGS. 1 and 2. FIG. In the figure, reference numeral 1 denotes a piezoelectric element, which is
bonded onto a metal plate 2. Terminals 2a and 2b are integral with the metal plate 2 and project
substantially radially from the plane of the metal plate 2. One of the terminal portions 2a is
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longer than the other terminal portion 2b and is directly attached to the printed circuit board It is
Here, a plurality of terminal portions 2a may be provided in order to increase the strength when
attached to a printed circuit board. In addition, at the tip of the terminal portion 2a, a positioning
step portion 2c which serves to position when attached to a printed circuit board is provided. The
reference numeral 3 denotes an insulator such as plastic, and is mounted so as not to be
separated from the terminal portion 2b by press fitting. Further, the terminal 4 is integrally
formed on the insulator 3, and the insulator 3 is provided in advance with a hole for the terminal
portion 2b.
In the extension of the terminal 4, there is provided a contact point 4a which is integrally
contacted or soldered on the piezoelectric element 1, and in the other extension, a positioning
step similar to the positioning step 2c. The part 4b is provided. Furthermore, 6 is a resonance
box adhered and fixed to the outer peripheral part of the metal plate 2 on the opposite side to
the surface to which the piezoelectric element 1 is adhered, for further improving the sound
pressure. It goes without saying that electrodes are provided on both sides of the piezoelectric
element 1, and when a three-terminal type piezoelectric element having a structure in which the
electrodes on one side are divided, the terminal portion 2b is used. A terminal portion similar to
the above may be separately provided, and a terminal 4 having a contact 4a and an insulator 3
may be prepared in the same manner as described above. According to the piezoelectric
sounding body of the present invention configured as described above, direct attachment to a
printed circuit board is possible, lead wires are also unnecessary, and assembly man-hours can
be reduced and reliability can be improved. . In addition, since the printed circuit board can be
mounted in the vertical direction, the mounting can be made small in space, which is practically
excellent. Further, by providing one resonance box, the sound pressure can be further improved.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view showing an embodiment of a piezoelectric speaker according to
the present invention, and FIG. 2 is a perspective view thereof.
DESCRIPTION OF SYMBOLS 1 ииии Piezoelectric element, 2 иииииии Metal plate, 2a, 2b иииииииии Terminal
part, 3 ииииииииииииииииииииииии Terminal , 4a и и и и и и и и и и и и и и и и и и и и и и и и и и и и resonant box. Name of Agent
Attorney Nakao Toshio Other 1 person /-1 piezoelectric element
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