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DESCRIPTION JPS56152494

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DESCRIPTION JPS56152494
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a conventional piezoelectric
speaker, FIG. 2 is an explanatory view showing a general monomorph vibrator, and FIG. 3 is an
embodiment of the piezoelectric speaker of the present invention. FIG. 4 is a cross-sectional view
of a dome-shaped diaphragm used for the speaker, and FIGS. 5 to 7 are frequency characteristics
when the inner diameter of the frame of the speaker is changed. 3 и и и и и и и и и и и и и и и и и и
monomorph oscillator, 4 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 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 frame , 8 и
и и и и и и и Through hole, 9 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 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 и и и и и и и и и и
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
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 ии 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 и и и и и и и и и и и и и и Sticky part.
DETAILED DESCRIPTION OF THE INVENTION The present invention is constructed by
connecting a monomorph vibrator constituted by connecting an electrode on one side of a
piezoelectric ceramic disk and a metal plate which becomes an electrode on the other side to a
dome-shaped diaphragm. The present invention relates to a piezoelectric speaker. A conventional
piezoelectric speaker is configured as shown in FIG. 7, 2/4, that is, the peripheral edge of the
cone-shaped diaphragm 2 is bonded to the peripheral edge of the bottomed case-like frame 1 by
bonding, etc. The central portion of the vibrator 3 is connected. In this configuration, since the
vibration of the piezoelectric vibrator 3 is performed by the diaphragm 2, the setting of the
lowest resonance frequency must be performed with the peripheral portion of the diaphragm 20,
and the selection of the material of the diaphragm 2 and the shape of the periphery It takes time
and effort to make, for example, the device needs to be devised. Further, since the coupling
between the diaphragm 2 and the piezoelectric vibrator 3 utilizes the top portion of the
diaphragm 2, the coupling area is small and it can not be made to have sufficient mechanical
strength, which is inferior in reliability. It was a thing. Furthermore, since the top of the
diaphragm 2 is coupled to the center of the piezoelectric vibrator 3, only vertical vibration due to
bending at the center of the piezoelectric vibrator 3 can be used, and the efficiency is also poor -
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5. I was shook. That is, the monomorph oscillator 3 shown in FIG. An electrode 5 of silver paint
or the like is provided on one side of a sodium bicarbonate 3 piezoelectric ceramic disk 4, and a
metal plate 6 serving as an electrode is attached to the other side. When a signal is applied to the
metal plate 6, the piezoelectric ceramic disk 4 is expanded and contracted in the radial direction
by the polarity of the signal, and the presence of the metal plate 6 which acts to inhibit this
expansion and contraction 0 with respect to the radius R of the piezoelectric ceramic disk 4.
Bending and vibrating with 6R as a node. Thus, the central portion of the piezoelectric vibrator 3
has only the vertical amplitude due to the bending vibration, and this is transmitted to the
diaphragm 2 to generate the sound, so the driving force generated from the piezoelectric vibrator
3 is sufficiently utilized. It could not be said that it was inefficient. The present invention
eliminates the above-mentioned conventional drawbacks. An embodiment of the present
invention will be described below with reference to FIGS. Reference numeral 7 denotes a
cylindrical frame having a stepped through hole 8. The periphery of the dome-shaped diaphragm
10 is bonded to the step 9 of the frame 7 by bonding or the like. The dome-shaped diaphragm 10
is made of a film such as a polyester film as shown in FIG. 4, and is bonded horizontally around
the dome portion 11 with the edge of the metal plate 60 of the monomorph vibration F3 shown
in FIG. It has a portion 12 and is configured to have a horizontal sticking portion 13 to be stuck
to the step portion 9 of the frame 7 at the peripheral edge portion of the coupling portion 12.
The upper-a ? monomorph oscillator 3 is configured as shown in the second wall, and the metal
plate 6 is configured to have a larger diameter than the piezoelectric ceramic disk 4, and the
peripheral edge of the metal plate 6 protruding from the piezoelectric ceramic disk 4 The portion
is bonded to the connecting portion 12 of the dome-shaped diaphragm 1o by bonding or the like.
With such a configuration, when a signal is applied to the electrodes 5 of the monomorph
vibrator 3 and the metal plate 6, the piezoelectric ceramic disk 4 expands and contracts as shown
by arrows in FIG. This expansion and contraction is also transmitted to the metal plate 6, and is
also transmitted to the dome-shaped diaphragm 1o to which the peripheral portion of the metal
plate 6 is joined, and the diameter of the dome portion 11 of the dome-shaped diaphragm 10 is
expanded and contracted. The diaphragm 1o vibrates to emit sound. This expansion and
contraction of the basic operation of the piezoelectric ceramic plate 4 is transmitted to the domeshaped 6 diaphragm 10 to convert it into the vibration of the dome-shaped diaphragm 1o, so it
becomes the most efficient operation and its noise pressure level can be improved. By selecting
the dimensions of the small diameter portion 8a of the through hole 8 of the frame 7, arbitrary
frequency characteristics can be obtained. That is, the monomorph oscillator 3 having an outer
diameter of 20 WR at a resonance frequency of 6 KHz is coupled to the dome-shaped diaphragm
10 formed of a polyester film having a thickness of 76 ?, and the diameter of the small diameter
portion 8 a of the through hole 8 is 21 Nt * 22 ? as the frame 7. Sound pressure frequency
characteristics at 23 m are shown in FIG. 6, FIG. 6, and FIG. As described above, since the
piezoelectric speaker according to the present invention is configured, the frequency
characteristics can be arbitrarily controlled by selecting the dimensions of the frame, and
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moreover, the driving force of the monomorph oscillator is most efficiently used. As a result, the
bonding area between the dome-shaped diaphragm and the monomorph oscillator is large and
the bonding strength is improved, and the reliability in terms of quality is also improved. Of great
value. ??
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