JPS603280B2 - Piezoelectric buzzer, electroluminescence composite - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a piezoelectric buzzer and an electroluminescent device having a polarized piezoelectric ceramic as a base and combining a piezoelectric buzzer and electroluminescence on the ceramic base.
It concerns luminescent composites.

As shown in Fig. 1, a conventionally known piezoelectric buzzer consists of polarizing a piezoelectric ceramic a, attaching a metal plate b that also serves as an electrode or a diaphragm made of synthetic resin to one side of the piezoelectric ceramic, and If the diaphragm is made of synthetic resin or the like, an electrode is provided on one side of the ceramic 1 and the diaphragm is bonded to the metal plate b. Alternatively, by applying an alternating current voltage to the substitute electrode and the electrode c, the resulting expansion and contraction of the piezoelectric ceramic is transmitted to a diaphragm made of a metal plate b or a synthetic resin plate to generate a buzzer buzz within the resonance box. There is.

In addition, as shown in Fig. 2, electroluminescence is achieved by attaching and fixing a back electrode f to one side of a dielectric ceramic substrate e, and then sequentially attaching a phosphor layer g and a transparent electrode h to the surface facing the pond. Then, a voltage is applied to the back electrode f and the transparent electrode h,
The structure is such that the crab light body layer g is excited and a rope of light is emitted from the back electrode f.

Therefore, the pressure fin ceramic a of the crab pressure buzzer is electro-
It can be used by selecting a dielectric ceramic plate e that has the same material and characteristics as the luminescent dielectric ceramic plate e and having a large electromechanical coupling coefficient and polarizing it.

In addition, the inventors were able to develop the production of an electroluminescent piezoelectric dielectric ceramic plate having a transparency of about 60%. In view of the above, the present invention uses a common opaque or transparent fin ceramic substrate that can have the same performance as the emissive ceramic of the piezoelectric buzzer even if polarized, and combines the piezoelectric buzzer and electroluminescence of the substrate. A configuration in which a voltage is applied simultaneously to cause the buzzer and the surface emission to occur simultaneously, or a voltage is applied separately to cause the buzzer and the surface emission to occur over time. The purpose is to obtain.

Several embodiments of the invention will now be described.

1st Example (Figures 3 to 5) The three powders on the P side and the PbTi03 powder are finally converted into Pb
(Tio. Crab Z [o.52) ○ 3 Mix to form a solid solution, grind, press mold, and give real scales, then attach a silver electrode 2 to one side, and prepare two plates V as known. Mno. A silver electrode layer 3 made of ZnS mixed with 5% by weight is provided, a transparent electrode 4 is placed thereon, and a silver electrode 5 is placed on the outer periphery of the resin layer 3 and the transparent electrode 4 with an insulating narrow groove in between. alms,
Further, a metal plate 6 is bonded to the silver electrode 2 using a conductive adhesive, and the piezoelectric buzzer B and electroluminescence EL are combined.

The composite of the above example is placed in a suitable resonant box and a voltage of 50 V to LOOV, 50 Hz to HZ is applied between the metal plate 6 and the transparent electrode 4 to excite the crab photolayer 3 and emit light through the transparent electrode 4. discharge.

In addition, 10 to 30 V is applied between the metal plate 6 and the silver electrode 5, and
By applying the voltage Z, the buzzer chimes.
The composite of this example has a metal plate 6 as shown schematically in FIG.
is filled by the back cover 8 of the digital watch 7, and the crab light layer 3
and a transparent electrode 4 are applied to the back surface of the liquid crystal display device 9, and the emitted light of the electroluminescence EL is used as auxiliary light, transmitted light, etc. that clearly highlights the time display by liquid crystal characters in several segments.

The case of the clock 7 acts as a resonance box for the buzzer B. Second Example (Figures 6-7) P powders of La203, Zr02, and Ti02 were prepared with a final composition of (PQ3-7) (Zr65Ti35) 1-0.
07/403, calcined, crushed, press molded, hot pressed under the conditions of 120,000 Psi, 2,000 Psi, 2 feeding times, and the visible transmittance after mirror polishing is 60% or more. A translucent dielectric ceramic 1 1 with a thickness of 0.5 ribs was fired, and silver electrodes were phosphorized on both sides.
After polarization by known means, the wire electrode is peeled off and both sides are polished to a mirror surface, a transparent electrode 12 is deposited on one side, and the same phosphor layer 13 as in the first embodiment is placed in the center of the other side. 20
Three evaporations are performed at a thickness of 00A to 4000A, which makes the layer transparent, and the transparent electrode 14 is deposited thereon.

In addition, a ring-shaped C-shaped transparent electrode 16 is deposited on the outer periphery of the phosphor layer 13 and the transparent electrode 14 with a gap, and a gap is formed between the transparent electrode 14 and the transparent electrode 16. The lead portion 15 is pulled out 4, and the transparent electrode 12 is further inserted.
A diaphragm 17 made of a glass plate or a synthetic resin plate is bonded and laminated to the diaphragm 17 . In the composite of this example, the glass plate or synthetic resin plate 17 (diaphragm) described above is filled with a transparent watch glass, and is used for the front cover of a watch case 18 as shown in FIG. , translucent pressure fin ceramic 11,
A voltage for illumination can be applied to the electroluminescence EL, which is composed of a transparent light layer 13 and a transparent electrode 14, and is also composed of a transparent electrode 12, a translucent piezoelectric cell 11, and a transparent electrode 15. Connect the piezoelectric buzzer B to the alarm wiring of the clock mechanism. The watch case 18 becomes a resonant box. In this configuration, everything is transparent, so the clock dial, hour hand, minute hand, etc. can be seen through completely, and the piezoelectric buzzer B provides an alarm function, and even in dark cases, the electroluminescence EL is driven to emit light to tell the time. can be discussed clearly. Third example (eighth
Figure) In the first and second embodiments described above, the piezoelectric buzzer B is provided separately by insulating the electrodes 4 and 5 or 14 and 16 of the electroluminescence EL, respectively. For example, polarized piezoelectric ceramic or translucent dielectric ceramic 2
A crab light layer 22 is provided on a part of 1, and electrodes 23 and 24 are provided on both surfaces.
is common to the piezoelectric buzzer B and the electroluminescent EL, and has a configuration in which a diaphragm such as a metal plate or a glass plate is attached to the electrode 23, and the piezoelectric ceramic or translucent dielectric ceramic 21 has a diameter of 20~ A voltage of 50 KV/arc is applied to polarize, and by applying a driving voltage of 100 V/HZ, which is 1/1/2 of the polarization voltage, the electromagnetic buzzer B's sound and the electroluminescent EL's IonL light emission are produced. bring about

As is clear from the description of the above embodiments, the present invention uses an opaque or transparent piezoelectric ceramic that can be used as a piezoelectric ceramic as a base of a piezoelectric buzzer or as a dielectric ceramic for electroluminescence depending on whether it is polarized or not. The buzzer is a composite of the piezoelectric buzzer B and the electroluminescence EL, which produce a bird's sound and emit light by applying a voltage to each of them at different times or at the same time as a base. It is possible to provide a composite material that has both the performance and luminescence emission functions in an opaque or transparent form and is miniaturized, and has an inventive step far beyond conventional technology.

[Brief explanation of drawings]

FIG. 1 is a side view of a conventional piezoelectric buzzer, FIG. 2 is a side view of a conventional electroluminescent buzzer, FIGS. 3 to 5 show a first embodiment of the present invention, FIG. 3 is a plan view, and FIG. The figure is a sectional view, and FIG. 5 is a sectional view showing an example of use. Figures 6 and 7 show the second embodiment, with Figure 6 being a plan view and Figure 7 being a plan view.
The figure is a sectional view showing an example of use. FIG. 8 is a sectional view of the third embodiment. 1... Piezoelectric ceramic, 2... Zeni electrode,
3...Transparent electrode, 5...Silver electrode, 6...Metal plate,
DESCRIPTION OF SYMBOLS 11... Translucent dielectric ceramic, 12... Transparent electrode, 13... Crab light layer, 14... Transparent electrode, 16...
- Transparent electrode, 17... Vibration plate, 21... Sho electromagnetic ceramic or translucent dielectric ceramic, 22... Crab light layer, 23, 24
···electrode. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8

Claims (1)

[Claims] 1. An electrode layer and a resonance plate such as a metal plate or a glass plate are provided in a laminated manner on one surface of a polarized opaque or transparent piezoelectric ceramic, and a phosphor layer is stacked on the other surface. A piezoelectric buzzer and an electroluminescent composite comprising an electrode layer that is electrically insulated or integrated with the layer and another part of the piezoelectric ceramic.