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DESCRIPTION JPH04293094

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DESCRIPTION JPH04293094
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
piezoelectric sounder capable of housing a piezoelectric diaphragm in a case and converting an
electrical input into an acoustic output, such as various household electronic devices, watches,
toys, etc. It is used for alarm sound, for confirmation sound of various OA devices, calculators,
cameras, etc., and further for alarm sound of gas leak alarm, smoke detector, car electrical
components etc.
[0002]
2. Description of the Related Art Heretofore, as shown in FIG. 4, a piezoelectric sounder of this
type is formed by bonding the outer periphery of a piezoelectric diaphragm 4 formed by bonding
a piezoelectric ceramic plate 2 to a metal plate 3 in the case 1. The terminals 6 are press-fit into
the terminal insertion holes 5 formed in two places on the side wall of the case 1 by bonding to
the inner circumference of the case 1, and the connection portions 6a of the respective terminals
6 are respectively inserted into the piezoelectric diaphragm 4 It was connected by solder (or
conductive adhesive) 7. Here, the terminal 6 has a shape as shown in FIG. 5, has a convex portion
6b along the longitudinal direction, is provided with a bent portion 6c for retaining at the upper
end portion, and from the one side The connection portion 6a is formed so as to protrude, and
the lower end portion is a terminal portion 6d which is inserted into a mounting hole of a circuit
board of various electronic devices and soldered. The terminal 6 is inserted into the terminal
insertion hole 5 of the case 1 as described above, and as shown in FIG. 6, the terminal 6 is
pressed into and held by the terminal insertion hole 5 with the convex portion 6b along the
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longitudinal direction. It is made to stop by the bending part 6c for a stop. Further, in FIG. 1,
reference numeral 8 denotes a sound release hole formed on the top surface of the case 1.
[0003]
The piezoelectric sounder applies a positive or negative voltage to the piezoelectric diaphragm 4
through the end 6d of the terminal 6 to generate a flexural vibration to obtain an acoustic effect.
[0004]
SUMMARY OF THE INVENTION The conventional piezoelectric sounder as described above has
the following problems due to the press-fit structure between the terminal insertion hole of the
case and the terminal.
[0005]
(1) The terminals have a shape having a convex along the longitudinal direction and are only
press-fit into the terminal insertion holes of the case, so that the variation in pressure input is
large due to the variation of the press-in allowance of the terminals and the case, There is a
disadvantage that rattling occurs at press-fit of the terminal, or chipping of the case, cracking or
deformation of the terminal tends to occur.
[0006]
(2) In order to obtain an appropriate pressure input, a high processing accuracy is required at the
press-fit portions of the case and the terminal, and there is a defect that the productivity is
inferior.
[0007]
(3) As described above, the press-fit portion of the case and the terminal is prone to rattling,
chipping, cracking and deformation, which has a disadvantage of poor reliability against
vibration, impact, high humidity, etc. .
In particular, when backlash occurs in the press-fit portion of the case and the terminal, in a
mounted state where the terminal is fixed to the electronic device, stress applied to the terminal
and stress due to vibration or shock is transmitted to the connection portion of the piezoelectric
diaphragm and the terminal And the vibration of the piezoelectric diaphragm is properly
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suppressed, and the acoustic characteristics are impaired.
[0008]
The present invention has been made to solve the above-mentioned problems, and it is an object
of the present invention to provide a piezoelectric sounder capable of securing the press-fit
structure of the case and the terminal and improving the productivity. It is said that.
[0009]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the
piezoelectric sounder according to the present invention has a protrusion on one side along the
longitudinal direction and the above-mentioned protrusion on the other side. A cross section in
which a plurality of terminals made of a thin metal plate provided with a pair of projecting
portions and a lower surface having a sound emission hole in the top surface and a plurality of
terminal insertion holes in the side wall are open The terminal insertion which is composed of a
U-shaped case and a piezoelectric vibrating plate, the piezoelectric vibrating plate is mounted in
the case, and the total thickness of the protruding portions and the pair of protruding portions of
the terminals is inserted. The terminal is formed to be slightly larger than the width of the hole,
and the terminals are respectively press-fit and held in the terminal insertion holes, and the
terminals are electrically and mechanically connected to the piezoelectric diaphragm.
[0010]
According to this configuration, the terminal has the projection along the longitudinal direction
and the pair of projecting parts provided on the other surface side so as to sandwich the
projection, the elasticity of the terminal As a result, the tolerance of the press-fit allowance of the
case and the terminal is increased, and the productivity of the case and the terminal is improved.
Further, due to the elastic effect, rattling of the press-fit portion between the case and the
terminal can be prevented, and chipping and cracking of the case at the time of press-fitting and
deformation of the terminal can be prevented.
Further, the press-fit structure of the case and the terminal can sufficiently withstand vibration,
impact, high humidity and the like, and hence high reliability can be realized and excellent
acoustic characteristics can be obtained.
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[0011]
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a sectional view showing an embodiment of a piezoelectric sounder according to the
present invention, FIG. 2 is a sectional view of the same part, and FIG. 3 is an enlarged
perspective view of a terminal constituting the piezoelectric sounder.
[0012]
In FIG. 1 to FIG. 3, reference numeral 11 denotes a case having a U-shaped cross section in which
a lower surface formed by resin molding or the like is open, and a sound emission hole 12 is
formed on the top surface thereof. Terminal insertion holes 13 are formed at two locations.
Reference numeral 14 denotes a piezoelectric diaphragm formed by bonding the piezoelectric
ceramic plate 15 and the metal plate 16. The piezoelectric diaphragm 14 is mounted in the case
11 with its outer periphery bonded.
[0013]
As shown in FIG. 3, a pair of projecting portions 17b are provided on one side of the projection
17a so as to sandwich the projection 17a at an appropriate location on the other side. It is a
terminal formed by pressing a thin metal plate provided.
Further, a connecting portion 17c electrically and mechanically connected to the piezoelectric
diaphragm 14 is formed on one side of the terminal 17 so as to protrude, and a bending portion
17d for preventing the release is provided at an upper end portion thereof. The other side is a
terminal portion 17e which is inserted into a mounting hole of a circuit board of various
electronic devices and connected by soldering or the like.
[0014]
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There are two terminals 17, which are press-fitted and held in the terminal insertion holes 13 of
the case 11. The total thickness of the convex portion 17a and the pair of projecting portions
17b is as shown in FIG. It is formed slightly larger than the hole width A, and can be press-fitted
and held in the terminal insertion hole 13 formed in the case 11 of the terminal 17. The terminal
17 held by press-fitting in the terminal insertion hole 13 of the case 11 is prevented from
coming off by the bent portion 17 d, and the connection portion 17 c is bent to form the
piezoelectric diaphragm 14 and the solder (or conductive adhesive) 18. Are electrically and
mechanically connected.
[0015]
In this configuration, a pair of projecting portions 17b is used as a supporting portion, and a twopoint supporting beam to which concentrated load is applied to the projecting portion 17a is
formed in the press-fit portion of the case 11 and the terminal 17, and the terminal 17 is a thin
metal plate By forming in, it is possible to realize a press-in structure with sufficient elasticity.
[0016]
According to the piezoelectric sounder of the present invention configured as described above,
the following effects can be obtained.
[0017]
(1) Using a metal plate having a protrusion along the longitudinal direction and a pair of
projecting portions provided on the other surface side so as to sandwich the protrusion as a
terminal, the total thickness of the metal plate is the terminal insertion hole of the case Since the
configuration has a slightly larger size than the hole width, the elastic effect of the terminal
increases the tolerance of the press-fit allowance of the case and the terminal, and the
productivity of the case and the terminal is improved.
[0018]
(2) By the elastic effect, rattling of the press-fit portion between the case and the terminal can be
prevented, and chipping and cracking of the case at the time of press-fitting and deformation of
the terminal can be prevented.
[0019]
(3) Since the terminal can be securely press-fitted and held in the case, it has a configuration that
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can sufficiently withstand vibration, impact, humidification, etc., high reliability can be realized,
and proper vibration of the piezoelectric diaphragm can be suppressed. It is possible to obtain
excellent acoustic characteristics without
[0020]
Brief description of the drawings
[0021]
1 is a cross sectional view showing an embodiment of a piezoelectric sounder according to the
present invention.
[0022]
Fig. 2 The same cross section
[0023]
Fig. 3 An enlarged perspective view of the terminals constituting the same piezoelectric sounder
as viewed from below
[0024]
4 is a cross-sectional view of the piezoelectric sounder in the prior art example. FIG. 5 is an
enlarged perspective view of the terminal constituting the piezoelectric sounder as viewed from
below.
[0025]
Fig. 6 Cross section of the main part of the same piezoelectric sounder
[0026]
Explanation of sign
[0027]
11 case 12 sound output hole 13 terminal insertion hole 14 piezoelectric diaphragm 15
piezoelectric ceramic plate 16 metal plate 17 terminal 17a convex portion 17b protruding
portion 17c connecting portion 17d retaining bent portion 17e terminal portion 18 solder (or
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conductive adhesive) )
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