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JPH11231876

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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 JPH11231876
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
terminal fixing structure of an electronic component such as a piezoelectric buzzer.
[0002]
2. Description of the Related Art Conventionally, a diaphragm is fixed to the side wall of a resin
case by an adhesive, the tip of the terminal is connected to the piezoelectric body fixed to the
diaphragm by solder, and the terminal is fixed to the resin case by heat staking. A piezoelectric
buzzer is known (see, for example, JP-A-7-274299).
[0003]
In addition, as another terminal fixing structure, the diaphragm is supported in pressure contact
with the side wall of the resin case and the resin cover, and the terminal fixed by heat caulking
on the resin case is pressed with the resin cover, thereby piezoelectrically operating the terminal.
It is also known to be in contact with the body (see Japanese Utility Model Laid-Open Publication
No. 59-157394).
[0004]
However, in the former case, since the terminal is fixed to the resin case only by heat caulking,
the molten resin gets in between the terminal and the resin case, causing the terminal to float up.
There is a problem that the terminal attitude is varied.
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[0005]
In the latter case, since the terminal is pressed by the resin cover, variations in the terminal
posture can be eliminated, and there is an advantage that the contact pressure between the
terminal and the piezoelectric body can be secured. If necessary, there is a problem that it is
necessary to strictly control the dimensions and assembly errors of the resin case and the resin
cover.
Moreover, the contact pressure of a terminal and a piezoelectric material might become high
more than necessary.
[0006]
Therefore, an object of the present invention is to provide a terminal fixing structure of an
electronic component in which the terminal can be attached to the resin case in a stable posture.
[0007]
In order to achieve the above object, the invention according to claim 1 has a terminal block
portion and an element storage portion, and a resin case having a pin protruding from the
terminal block portion, An electronic component element having a conductive portion on the
surface and disposed in the element storage portion of the resin case, a fitting hole fitted to the
pin, and a fitting hole and a pin for the conductive portion of the electronic component element
And a terminal having a spring contact portion pressed against in the fitting direction, in which
the claw portion protrudes inward in the fitting hole, and the fitting hole is fitted to the pin Thus,
the claws are crimped to the outer peripheral surface of the pin in a state in which the claws are
bent in the reverse fitting direction.
[0008]
The electronic component element is housed in the element housing portion of the resin case,
and the pin protruding from the terminal block portion is fitted into the fitting hole of the
terminal.
At this time, the spring contact portion of the terminal is in pressure contact with the conductive
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portion of the electronic component element, and the claw portion provided in the fitting hole is
crimped to the outer peripheral surface of the pin in a state of being bent in the opposite
direction.
Since the spring force of the claws always acts on the pin in the direction of crimping, if the
terminal is press-fit to the back of the pin, it does not come off even if the drawing force acts on
the terminal, and the position is stabilized.
In addition, since the claws provided in the fitting holes support the reaction force of the spring
contact portion, the contact pressure of the terminal with respect to the electronic component
element can be stabilized.
[0009]
1 to 6 show a piezoelectric buzzer which is an example of an electronic component according to
the present invention.
In the figure, reference numeral 1 denotes a resin case made of a thermoplastic resin such as
PPS, which is integrally molded in a concave shape by the bottom wall portion 1a and the side
wall portion 1b. A terminal block 1c partially cut is provided at one end of the side wall 1b, and
an arc-shaped engaging portion 1d is formed on both side walls of the terminal block 1c. The
first terminal 10 is prevented from rotating by engaging the center portion of the first terminal
10, in particular, the arc-shaped notches 11 on both side edges with 1d. A cylindrical pin 1e for
fixing the first terminal 10 is integrally projected on the terminal block 1c.
[0010]
The first terminal 10 is made of an elastic metal such as 42Ni alloy or phosphor bronze, and a
fitting hole 12 is formed in the center thereof. As shown in FIG. 6A, three claws 13 are provided
in the fitting hole 12 so as to protrude inward. The inner diameter d of the claw portion 13 is
smaller than the outer diameter of the pin 1 e, and the inner diameter D of the fitting hole 12 is
larger than the outer diameter of the pin 1 e. An external connection portion 14 projecting to the
outside of the case 1 is bent in a step shape on one end side of the first terminal 10, and a spring
contact portion 15 to be inserted into the case 1 is formed on the other end side. ing. When the
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fitting hole 12 is press fitted to the pin 1e, as shown in FIG. 4, the claw portion 13 bites into the
outer peripheral surface of the pin 1e in a state of being bent in the reverse fitting direction. The
surface electrode 31 of the body 30 is in pressure contact. At this time, the first terminal 10 is
pushed upward by the reaction force of the spring contact portion 15, but the claw portion 13 to
be crimped in a state of being bent in the opposite fitting direction to the outer peripheral
surface of the pin 1e supports the reaction force Therefore, the floating of the first terminal 10
can be prevented, and the contact pressure between the spring contact portion 15 and the
surface electrode 31 can be secured.
[0011]
In the above embodiment, although the example in which the three claws 13 are provided in the
fitting hole 12 is illustrated, the present invention is not limited thereto, and the four claws 13
may be provided as illustrated in FIG. As shown in FIG. 6 (c), two claws 13 may be provided in a
protruding manner, and both have a function of centering the pin 1e. Further, as shown in FIG. 6
(d), one end side of the fitting hole 12 is cut in a V shape, and one claw portion 13 is formed on
the opposite portion, or as shown in FIG. 6 (e) One end of the hole 12 may be cut into a V-shape,
and two claws 13 may be formed on the opposite portion. Alternatively, the claw portion 13 may
be formed in the planar direction of the first terminal 10 and press-fitted into the pin 1 e to be
bent in the opposite direction, or may be formed in a state bent in the opposite direction. May be
[0012]
A stepped portion 1 f which is one step higher is formed around the bottom wall portion 1 a of
the case 1, and a suitable number of air holes 1 g are formed in the bottom wall portion 1 a. A
diaphragm 20 which also serves as a second terminal is mounted on the stepped portion 1f. The
diaphragm 20 is formed in a rectangular shape, and its peripheral edge portion is positioned on
the inner surface of the side wall portion 1b. Therefore, an element storage portion is constituted
by the bottom wall portion 1a, the side wall portion 1b and the step portion 1f of the case 1. The
diaphragm 20 is made of an elastic metal similar to the first terminal 10, and an external
connection portion 21 projecting to the outside of the case 1 is integrally formed at one end
thereof. Arc-shaped notches 22 are formed on both side edges of the external connection portion
21, and the notches 22 are engaged with the engaging portions 1 i of the terminal block 1 h
which is notched at the other end of the side wall 1 b. The external connection portion 21 is
positioned on the terminal block 1 h. A fitting hole 23 is formed in the external connection
portion 21, and the fitting hole 23 is inserted into a pin 1j protruding from the terminal block 1h.
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[0013]
The piezoelectric body 30 in which the electrodes 31 and 32 are formed on the front and back
surfaces is fixed to the upper surface of the diaphragm 20, and the diaphragm 20 and the back
surface electrode 32 are electrically connected. By applying a voltage between the electrodes 31
and 32, the diaphragm 20 can be vibrated through the piezoelectric body 30 to generate a
buzzer sound. The buzzer sound is emitted to the outside from the sound emission hole 1k
formed in the side wall portion 1b of the case 1. In the bottom wall 1a of the case 1, an air hole
1g is formed.
[0014]
A resin cover 2 is mounted on the case 1. The cover 2 is also made of the same resin as the case
1, and on the lower surface of its peripheral edge, a rib 2a having a triangular mountain-shaped
cross section to be ultrasonically welded on the upper surface of the side wall 1b of the case 1 is
formed (see FIG. 5) . On the lower surface of the cover 2, a peripheral wall 2b fitted inside the
side wall 1b of the case 1 is protruded, and this peripheral wall 2b has a function of pressing the
peripheral portion of the second terminal 20 against the step 1f of the case 1 to stabilize it. Have.
A pair of pressing walls 2c and 2d provided with a gap for inserting the pins 1e and 1j are
provided on the lower surface of both ends of the cover 2 so as to protrude. These pressing walls
2c and 2d are central portions of the first terminal 10. It has a function of pressing (both sides of
the fitting hole 12) and the external connection portion 21 of the second terminal 20 against the
terminal block portions 1c and 1h. Further, as shown in FIG. 5, a part of the peripheral wall 2b
located inside the one pressing wall 2c is cut out, and the bottom surface of the cut portion 2e
restricts the rising of the spring contact portion 15 of the first terminal 10. doing. Therefore, the
spring contact portion 15 can press the piezoelectric body 30 with a sufficient pressure.
[0015]
In this embodiment, an example in which the spring contact portion 15 of the first terminal 10 is
electrically connected by pressure contact with the surface electrode 31 of the piezoelectric body
30 is shown, but in order to make the connection more reliable, the spring The contact portion
15 and the surface electrode 31 may be connected and fixed using solder, a conductive paste, or
the like.
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[0016]
In the example, the second terminal 20 to which the piezoelectric body 30 is fixed is housed in
the case 1 and pressed from the upper surface thereof by the spring contact portion 15. It may
be fixed by means of caulking or the like.
[0017]
Also, the external connection portion 21 of the second terminal 20 is provided with the fitting
hole 23 to be inserted into the pin 1j, but the fitting hole 23 is also provided with a claw portion
similar to the first terminal 10 It may be fixed by press fitting.
[0018]
In the above embodiment, although the terminal fixing structure of the present invention is
applied to a piezoelectric buzzer, it is an electronic component having a structure in which an
electronic component element is housed in a resin case and the spring contact portion of the
terminal is pressed against the conductive portion of the surface. , Applicable.
Therefore, the external connection portion of the terminal is not essential, and may be a
connection terminal for bringing the plurality of conductive portions of the electronic component
element into conduction with each other.
[0019]
As apparent from the above description, according to the present invention, the spring contact
portion of the terminal is in pressure contact with the conductive portion of the electronic
component element, and the claw portion provided in the fitting hole is not Since the terminal is
crimped to the outer peripheral surface of the pin in a bent state, if the terminal is press-fit to the
back of the pin, the terminal will not come out even if the drawing force acts on the terminal, and
the position will be stable. The claw portion provided in the hole can support the reaction force
of the spring contact portion, and the contact pressure of the terminal to the electronic
component element can be stabilized.
Therefore, unlike the conventional fixing method by heat caulking, the terminal does not float up
and there is no need to press the terminal with the cover, so the dimensional control between the
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case and the cover becomes easy, and the contact pressure between the terminal and the element
It can be set properly.
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