Patent Translate Powered by EPO and Google Notice This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate, complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or financial decisions, should not be based on machine-translation output. DESCRIPTION JPS63102500 [0001] The invention is a transducer plate for a piezoelectric-electroacoustic transducer, comprising a piezoelectric layer provided on a carrier and provided with electrodes on both sides, the carrier comprising It relates to the type supported in the casing at its edge area. Prior Art Transducer plates for piezoelectric transducers are known from various literatures. This piezoelectric transducer is increasingly used in modern phones because of its frequency response compensation and its high operating reliability. For example, according to European Patent Application No. 0069824, a converter plate with a metallic carrier is known. An adhesive layer is provided on the entire surface of this carrier. The piezoelectric layer comprises electrodes on both sides and is fixedly connected to the carrier by means of the adhesive layer. A piece of connecting band leading to the electrode serves for electrical contact with the electrode. Modern insulating materials are increasingly used to prevent electrostatic discharge (ESD-ekectrostatic discharging). Electrostatic charge is often caused by the contemporary interior of a room, for example a plastic carpet floor. The human body lying on a plastic carpet floor sometimes receives a strong current impact when in contact with a grounded or conductive object or with a symmetrical object with a small breakdown strength relative to the load voltage. There is. Furthermore, when the human body discharges with a high current, a strong electromagnetic field is generated, which may induce a voltage in the electrical device, thereby interfering with the function of the device. In order to eliminate these disadvantages, relatively high breakdown strength is generally required. As known converter boards have a metallic carrier, it is possible, for example, to increase the breakdown strength by increasing the distance to the outer edge of a telephone, in particular a desk phone. But of course there is a limit to this means. Problems to be solved by the present invention The object of the present invention is to provide a converter plate capable of significantly increasing the dielectric breakdown strength without having to change the structure in the housing to be accommodated. SUMMARY OF THE INVENTION The 12-05-2019 1 subject matter of the present invention, which solved the above-mentioned problems, is that the carrier consists of non-metallic materials, in particular plastics. Operation and Effect of the Invention According to this means, high dielectric breakdown strength can be obtained. However, the thickness of the carrier is configured such that the fundamental resonance is maintained depending on the plastic material. Experiments were performed with commercially available epoxide materials having lower specific gravities and elastic moduli compared to commonly used aluminum alloys. As a result, the support must be somewhat thicker than conventionally used aluminum plates. Because the internal friction of the plastic material is large compared to aluminum, the vibrational behavior of the transducer is well damped and a well-compensated frequency characteristic is obtained. In particular, the excess in the upper range is also low compared to the known carrier plate made of metal (which is positive because of the frequency linearization). For this reason, it is possible to dispense with the buffer plate in the front chamber of the converter plate which is known from DE 28 31 411 A1. It is advantageous if the temperature coefficient of the plastic is approximately equal to the temperature coefficient of the piezoelectric layer. The temperature dependence of known converter boards with metal carriers is extremely large because of the relatively strong bimetal effect, so that the requirements relating thereto are not fulfilled in connection with the sensitivity changes of many communication controls. With proper choice of a plastic carrier material with a temperature coefficient similar to that of the piezoelectric layer, the temperature behavior is significantly altered. At present, the adhesion between the piezoelectric layer and the carrier can only be controlled indirectly, for example by means of bending tests. I can not find the adhesion failure point. However, poor adhesion results in additional variability in transmission data or in poor resistance to the environment. Therefore, it is effective if the plastic is formed of a transparent material. By this means, it can be optically detected without any damage to the transducer plate whether the adhesion is uniform over the entire surface. As already mentioned at the outset, the electrical contact of the transducer plate is effected by means of the connecting strip. However, this connecting band piece is apt to break and thus significantly reduces the operation reliability. A new carrier made of plastic is suitable for the different technology of contact. It is thus advantageous to provide the conductor tracks on the carrier and to guide them to the electrodes of the piezoelectric layer. A guide rubber, which can also be a component of the bearing, at the free end of the conductor track is advantageously arranged for the contact. On plastic carriers, conductor tracks made of graphite can be provided by simple manufacturing techniques, such as, for example, sieve printing, so that through contact at the clamping points of the oscillating transducer plate is also possible. EXAMPLE FIG. 1 shows a transducer plate, which consists of a plastic carrier l. The adhesive layer 2 is provided on the entire surface of this carrier. A piezo-electric layer 3 is bonded to this adhesive layer 2, which piezo-electric layer comprises electrodes 4.5 on both sides. Conductor tracks 6, 7 are provided on the carrier for electrical contact to the electrodes. 12-05-2019 2 Conductor track 6 leads to electrode 5. The end of the conductor track 7 is electrically connected to the electrode 4 via the through contact 8. The edge area of the transducer plate is a bearing 9. It is clamped between the two casings 11.32. A guide rubber 13 is provided for the contact of the free end of the conductor track 6.7, whose connection 14 is connected to another electrical device. [0002] Brief description of the drawings [0003] FIG. 1 is a cross-sectional view of a transducer mounted with a transducer plate according to an embodiment of the present invention, and FIG. 2 is a plan view of the transducer plate according to an embodiment of the present invention. 12-05-2019 3
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