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JPH05281975

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DESCRIPTION JPH05281975
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
piezoelectric sounding body used for sounding of various alarm devices and sounding of an
operation confirmation sound of a push button switch.
[0002]
2. Description of the Related Art FIG. 5 is a cross-sectional view showing a conventional
piezoelectric speaker. The piezoelectric sounding body includes a case body 1 with a lower
opening, a piezoelectric vibrator 2 fitted and fixed to the inside of the case body 1, and a fixing
member for fixing the periphery of the piezoelectric vibrator 2 to the case body 1. It consists of a
cap body 3. The piezoelectric vibrator 2 has a piezoelectric ceramic element (ceramic
piezoelectric body) 22 attached to the lower surface of a metal plate 21. The piezoelectric
vibrator 2 has an input terminal 23 connected to the metal plate 21 and an input terminal 24
connected to the piezoelectric ceramic element 22. Are respectively derived below the cap body
3. In this state, the internal space between the piezoelectric vibrator 2 and the case body 1 is set
to the resonance air chamber 4. Further, a sound output hole 5 is opened in one side surface of
the case body 1.
[0003]
When the piezoelectric vibrator 2 vibrates by the signal voltage from the drive source, this
vibration is resonantly expanded in the resonance air chamber 4, and the sound generation hole
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5 emits sound.
[0004]
In the conventional piezoelectric sounding body, a sound emission hole is opened at one side of
the case body.
The piezoelectric speaker of this structure has an advantage that the adsorption workability of
the automatic mounting machine in which the suction nozzle is suctioned to the upper surface of
the case body for automatic attachment is superior to the sound generator having the sound
emission hole opened on the upper surface of the case body. However, in the case of a sounding
body having a sound emission hole on the side surface of the case body, the radiation direction of
the sound wave is restricted compared to the sounding body having a sound emission hole on the
top surface of the case body, and the effective sound in the target direction is There was a
disadvantage that it was difficult to get.
[0005]
The object of the present invention is to provide a piezoelectric sounding body capable of solving
the above problems and combining and using a plurality of sounding bodies having different
directions of sound emission holes and obtaining a desired sound emission direction. Do.
[0006]
SUMMARY OF THE INVENTION In order to achieve the above object, the piezoelectric sounding
body of the present invention is configured as follows.
The piezoelectric sounding body includes a lower opening case-like case body having a sound
emission hole on the side, a piezoelectric vibrator fixedly disposed in the case body, and having a
ceramic piezoelectric body attached to a metal plate, the metal plate A terminal socket portion
connected to each of the input terminals is disposed on the upper surface of the case body, which
comprises an input terminal connected to each of the ceramic piezoelectric members.
[0007]
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2
In the piezoelectric sounding body having such a configuration, a plurality of (for example, four)
terminal socket portions are provided on the upper surface of the case body with different
positions. The two terminal socket portions are connected to the input terminal connected to the
metal plate, and the other two terminal socket portions are connected to the input terminal
connected to the ceramic piezoelectric body. Accordingly, the signal voltage entering the input
terminal is simultaneously output to the terminal socket.
[0008]
At the time of use, a plurality of piezoelectric sounding bodies are vertically coupled in
combination depending on the desired sound wave radiation direction. That is, assuming that the
basic piezoelectric sounding body has a sound emitting hole on the left side, the basic
piezoelectric sounding is performed so that the sound emitting hole of the upper sounding body
comes in a direction perpendicular to the sound emitting hole of this basic piezoelectric sounding
body. Select the body's terminal socket. Then, the two input terminals of the piezoelectric
sounding body in the upper stage are inserted into the selected terminal socket portions for
connection and connection. As a result, the signal voltage from the drive source is simultaneously
input to the two upper and lower sounding bodies, the upper and lower piezoelectric vibrators
vibrate, and sound is generated from the two sound emission holes positioned in different
directions (perpendicular direction). It emits noise. That is, sound can be emitted in a plurality of
different sound emission directions.
[0009]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a cross-sectional view
showing a specific embodiment of a piezoelectric speaker according to the present invention.
[0010]
The piezoelectric sounding body includes, as is well known, a case body 1 with a lower opening
and a bottom, a piezoelectric vibrator 2 fitted and fixed to the inside of the case body 1, and the
periphery of the piezoelectric vibrator 2 as the case body 1. It consists of the fixing cap body 3 to
fix.
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The piezoelectric vibrator 2 has a piezoelectric ceramic element (ceramic piezoelectric body) 22
attached to the lower surface of a metal plate 21. The piezoelectric vibrator 2 has an input
terminal 23 connected to the metal plate 21 and an input terminal 24 connected to the
piezoelectric ceramic element 22. Are respectively derived below the cap body 3. In this state, the
internal space between the piezoelectric vibrator 2 and the case body 1 is set to the resonance
air chamber 4. Further, as shown in FIG. 2, a sound output hole 5 is opened in the surface of one
side wall 11 of the case body 1.
[0011]
The feature of the present invention is that the terminal socket portion 6 is provided on the
upper surface wall 12 of the case body 1. The terminal socket portion 6 is configured by
providing four small terminal holes 61, 62, 63, 64 in the embodiment. The terminal holes 61 and
62 are electrically connected to the input terminal 24 via the connection lead 24a, and the
terminal holes 63 and 64 are electrically connected to the input terminal 23 via the connection
lead 23a. That is, the signal voltage that has entered the input terminals 23 and 24 from the
drive source is simultaneously output to the terminal socket section 6. Further, the terminal holes
61, 62, 63, 64 are arranged in a virtual cross shape with their positions shifted. In this way, the
terminal holes 61 (62) and 63 (64) are selected, and the input terminals of separate piezoelectric
sounding members are connected in connection so that a plurality of sound emission holes have
different directions. Do.
[0012]
The piezoelectric speaker having such a configuration can be used alone as shown in FIGS. 1 and
2. In this case, as shown in the figure, the sound emission hole 5 is provided only on one side
surface of the case body 1, and the radiation direction of the sound wave is limited to only one
direction. If it is necessary to widen the sound wave radiation direction, that is, a plurality of
different radiation directions, the piezoelectric sounding bodies of the embodiment are stacked
and connected in a plurality of stages, and used in combination. As shown in FIG. 3, for example,
assuming that the basic piezoelectric sounding body A has a sound emission hole 5 on the left
side, the sound emission hole 5a is in a direction perpendicular to the sound emission direction
of the basic piezoelectric sounding body A. The terminal socket portions (62, 63) of the basic
piezoelectric speaker A are selected. Then, the two input terminals of the piezoelectric sounding
body B in the upper stage are inserted into the selected terminal socket portions 62 and 63,
respectively, and connected. As a result, the signal voltage from the drive source is
simultaneously input to the upper and lower two sounding bodies A and B, and the upper and
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lower piezoelectric vibrators 2 and 2 vibrate, and two sound emission holes 5 positioned in
orthogonal directions respectively , The sound is emitted from 5a. Also, another separate
piezoelectric sounding body C can be placed on the piezoelectric sounding body B and connected
in a similar manner so that the sound emission holes 5b are positioned in completely different
directions. Therefore, by combining and connecting the plurality of piezoelectric sounding
members A, B, and C in the vertical direction, a combination of a plurality of different sound wave
radiation directions can be obtained, and sound can be generated in a plurality of sound emission
directions.
[0013]
Further, as shown in FIG. 4, for example, a piezoelectric sounding body D having a sound
emission hole 5c on the upper surface can be connected and connected on the piezoelectric
sounding body A having a sound emission hole 5 on one side in the lower side. Furthermore, by
changing the sound generation frequency of the piezoelectric sounding body to be combined in
the vertical direction to, for example, 1 KHz, 2 KHz, 3 KHz, 4 KHz, etc., double tones can be
combined according to the request, and wide band sound generation can be easily implemented.
[0014]
According to the present invention, as described above, the terminal socket portion connected to
each input terminal is disposed on the upper surface of the case body. By connecting sounding
bodies, a plurality of sound emission holes can be positioned in different directions, and a
plurality of sound wave radiation directions can be obtained. Further, since a plurality of
piezoelectric sounding members are connected in the vertical direction, no additional space is
required on the mounting substrate. Furthermore, by changing the sound generation frequency
of the plurality of piezoelectric sounding bodies combined in the vertical direction, it is possible
to generate a multiple sound, and it is easy to widen the sound generation, etc., thereby achieving
the excellent effects of achieving the object of the invention.
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