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JPS54146179

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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
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DESCRIPTION JPS54146179
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional
piezoelectric speaker, FIG. 2 is a cross-sectional view of a piezoelectric speaker according to an
embodiment of the present invention, and FIG. 3 is another embodiment of the present invention.
It is sectional drawing of the piezoelectric sounding body which is an example. 1 и и и и и и и и и и и и и и и
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Projections 10 и и и и и и и и и и и и и
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric
sounding body that produces an audible sound by applying an alternating current signal to a
piezoelectric element of an asymmetric bimorph structure formed by laminating a thin
piezoelectric element on a thin metal plate, the purpose of which is to assemble It is an object of
the present invention to provide a low-cost and stable-quality piezoelectric sounding body which
is easy to use and therefore requires less equipment for its assembly. A piezoelectric sounding
body is known as a highly reliable sounding body suitable for downsizing and thinning with a
small current consumption and a simple structure. This piezoelectric speaker uses a piezoelectric
element with an asymmetric bimorph structure by bonding a thin piezoelectric element to a thin
metal plate as a vibrator, and generates an L sound by applying an AC signal to both ends of the
piezoelectric element. (7) There is f и v vllOFE 3 to the sound generator. In the case of {circle over
(3)}, the support structure of the piezoelectric element is the most important point that influences
the performance and cost. FIG. 1 shows a conventional piezoelectric speaker. In the figure, 1 is a
cap-like upper case having a through hole 2 in the center of the earth wall and having a step 5 on
the inner periphery of the upper wall and having a lower surface opened, 3 a projection 4
corresponding to the step 5 It is a lower case which has a peripheral part. A thin metal plate 6
has a piezoelectric element 7 bonded to the metal plate 6, and the metal plate 6 and the
piezoelectric element 7 constitute a piezoelectric element. The piezoelectric element is held at
one vibration node by the step 5 of the upper case el and the 18 m 4 of the lower case 3. 8 is a
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lead for extraction. Fixation of the piezoelectric element to both upper and lower cases in the
piezoelectric sounding body having the above-mentioned structure is performed by an adhesive
or by heat welding or ultrasonic welding when resin is used for the material of the case. That's
normal. However, according to these methods, for example, if the adhesive must be carefully
applied in a limited area, or if it is thermally welded to the piezoelectric nirel 3), it should be heatwelded 4, the stomach, etc. The assembly process is complicated, so there is a limit in terms of
reduction of man-hours, and extra materials such as adhesives are required, and any of the above
methods requires dedicated equipment, etc. It was the cause. The present invention eliminates
the above-mentioned conventional drawbacks, and an embodiment thereof will be described
below with reference to the drawings. FIG. 2 shows a piezoelectric sounding body which is one
embodiment of the present invention. In the drawing, reference numeral 1 denotes an upper case
corresponding to the upper case 1 described in FIG. 1, and similarly to that case, it has a through
hole 29 stepped portion 6 and a projection 9 all around or in one part of the inner peripheral
wall. .
The lower case 3 also corresponds to the lower case 3 in the first factor, and in this case, the tip
of the projection 9 of the upper case 1 faces obliquely downward on the entire circumference or
part of the outer periphery of the i11 wall. When in a contact and pressed state, a dent 1o having
an inclined surface is provided so that the lower case 3 can be pushed up by the slope effect. It
should be noted that here, the side wall 14 of the upper case 1 is made to have elasticity] in a
state where force is applied to the upper case 1 and the lower case 3 is assembled into the upper
case 1) part of the side wall of the case 1 The tip end of the projection 9 is pressed against the
inclined surface of the dent 10 due to its restoring force, and as a result, the metal plate 6 of the
piezoelectric element is formed by the step 6 of the upper case 1 and the side wall 14 of the
lower case 3. A constant pressure is always applied to the portion held between the end face and
the metal plate, and in this way the metal plate is fixed with the held portion as the vibration
node. Reference numeral 7 denotes a piezoelectric element bonded to the metal plate 6, and
reference numeral 8 denotes a lead for extraction. FIG. 3 shows a piezoelectric speaker according
to another embodiment of the present invention. In the figure, 11 is a protrusion provided on a
part or the entire periphery of the outer peripheral portion of the side wall 14 of the lower case
3, and 12 is a hole provided so that the protrusion 11 engages with the side wall of the upper
case 1 Eleven inclined faces are drawn. In place of the holes 12, recesses may be provided. Also
in this case, in the state where the lower case 3 is incorporated into the upper case 1, the side
wall portion of the upper case 1 tries to cover the inner side, in which case the protrusion abuts
on the lower edge of the hole 121) The lower case 3 is to be pushed upward by the action of the
inclined surface 11 of 11 and 6). Therefore, the metal plate 6 of the piezoelectric element is
clamped and fixed between the step 5 of the upper case 1 and the upper end surface of the side
wall 14 of the lower case 3 under a constant pressure as described above. The other symbols in
the drawing are the same as those in FIG. 2 and the description thereof is omitted. Here, the
upper case or the lower case needs to be made of a material that can easily obtain elasticity, but
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it is appropriate to use a resin molded product or a metal molded product molded by squeeze
processing, or a combination thereof. is there. As described above, according to the present
invention, the fixing of the piezoelectric element and the case can be realized by simply engaging
the upper case and the lower case, and an adhesive is used as in the prior art, and heat welding
and ultrasonic welding Because there is no need to use a method, the assembly process can be
simplified, the number of man-hours can be significantly reduced, and materials used and
equipment can be reduced, thus enabling mass production, and hence cost reduction and quality
stabilization. In addition, since there is no flow of the adhesive to unnecessary parts, no
deformation of the case, etc., it is possible to easily provide a high quality piezoelectric speaker.
;> Furthermore, if the elastic force of the material of the case J is not sufficient to hold the
piezoelectric element, it is of course possible to use an adhesive in combination, in which case the
case when drying the adhesive In addition, since the process and jig for holding the piezoelectric
element are unnecessary, the number of assembling steps can be reduced. Particularly with
regard to the support of the vibrating element of the piezoelectric element that determines the
performance of the piezoelectric sounding body, the force that the elastically deformed side wall
tries to restore is converted by the slope effect of the inclined surface and becomes pressing
force that presses the upper case and lower case together. The piezoelectric sounding body
always exerts stable performance because the pressing force is always applied to the portion
holding the vibrating contact so as to securely hold the piezoelectric sounding body securely.
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