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DESCRIPTION JPS5433077

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DESCRIPTION JPS5433077
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 4 is a sectional view showing an example of a
sound emitting and emitting apparatus according to the present invention, and FIG. 2 is a
sectional view showing another embodiment. 1.21 · · · · · · Resonant plate, 2.3 · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · electroluminescent layer, 5.22.1 · · · · · · · electrodes.
DETAILED DESCRIPTION OF THE INVENTION This invention relates to a sound emitting device
using a piezoelectric material. Various electronic buzzers using piezoelectric elements for alarm
and signal use are known, but these devices are equipped with separate light emitting means
when it is intended to emit light at the same time as the 42 (9 or 20) sound generation. It is
difficult to use. It is an object of the present invention to provide a convenient sound emitting
device capable of performing light emission and displaying simultaneously by combining an
electroluminescent layer, a piezoelectric element, and a resonance plate. Hereinafter, an
embodiment of the present invention will be described with reference to the drawings. In FIG. 1,
reference numeral l denotes a resonance plate which resonates at the power supply frequency,
and is formed of a metal plate so as to be able to serve as an electrode, and piezoelectric
materials 2 and 3 are sandwiched between the back sides of the resonance plate. An
electroluminescent layer 4 is set. The electroluminescent layer 4 is formed of, for example, zinc
sulfide (ZnS: Mn) containing a minute amount of manganese (Mn) as an active material to be a
luminescence center. The piezoelectric substances 2 and 3 are made of a dielectric such as
barium titanate (BaT 103), for example, and also function to prevent the dielectric breakdown of
the electroluminescent layer 4. The piezoelectric substances 2 and 3 may be only one of them.
Reference numeral 5 denotes a transparent (2) electrode made of indium oxide ((n 203) or the
like formed on the piezoelectric substance 3. The piezoelectric substances 2 and 3 and the
electroluminescent layer 4 are easily formed by vapor deposition. The piezoelectric substances 2
and 3 may be made of PZT, ADP, PbNb 2 O 3 or the like. When an electric field E with a
frequency of 3 Kllz is applied at an applied voltage of 100 V to the device of the above
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configuration, the electrostriction of the piezoelectric substance 2.3 is transmitted to the
resonance plate 1 to generate vibration noise. The electroluminescent layer 4 emitted light with
sufficient luminance. The vibration sound reached a sound pressure of 90 db at a position lrn
apart, and the light emission luminance was 500 fL. FIG. 2 shows another embodiment, in which
the piezoelectric substances 2 and 3, the electroluminescent layer 4 and the metal electrode 22
are set on the thin glass plate 21 through the transparent electrode 5, and the glass plate 21 is
used as a resonance plate. It is made to constitute. In this case, in addition to the same effect as
the above embodiment, in addition to the first structure in which the light emission can be
viewed from the glass plate 21 side, the lead wire (not shown) for the metal electrode 22 can not
be seen either. There is no need to consider (3) The active substance to be the luminescent center
is limited to manganese. By selectively using other active substances such as copper (Cu), it is
possible to cause the display to emit light in any color.
By combining the electroluminescent layer, the piezoelectric substance, the resonance plate, and
the electrode as described above, this device can provide a convenient sound emitting device
capable of performing not only sound generation but also light emission display.
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