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 JPS49117777 [Detailed description of the invention] Piezoelectric acoustic transducer used in this invention for alarm buzzers such as fire alarm, anti-separator, gas detector, intercom or uThMFi atmosphere; Open to As shown in FIG. 1, a conventional piezoelectric acoustic transducer, for example, the device of JP-B-44-16268, is a composite by bonding a diaphragm 8 and a piezoelectric element 4 provided with silver electrodes 4a on the front and back. The body 5 is formed, and this composite 5 is provided with projections 8 facing the opening 1 and provided on the inner surface on the side of the opening 1 in the case 2 'having the opening 1-1 smaller than the diaphragm 3 in the-plane. While being supported, the oscillator circuit 71 is accommodated on the back surface of the composite 5 in the case 21, and the lead plate 9 connects the diaphragm 3 and one silver electrode 4 a of the piezoelectric element 4 to the oscillator circuit 71. Then, in the opening 1 of the case 2 '(the front surface of the case II' is joined to the case 2 'so that the resonance cylinder 6 projecting forwardly communicates with the opening 1). 10 is a power supply of the oscillation circuit 71. When the oscillation circuit 71 is energized from a power supply #lO of the oscillation circuit 1 and the vibration element is added to the piezoelectric element 4 through the oscillation circuit 7 ', the composite 5 is bent and oscillated, Sound waves are generated from the opening 1 of the case 2 r and resonated by the resonance cylinder 6 to increase the generated volume. The length a of the resonance cylinder 6 is usually 15 m. Therefore, in this apparatus, the complex 5 and the oscillation circuit 7 'are housed in the case 21, so the case 2! In addition, only the portion of the resonance cylinder 6 protrudes forward of the case 2 ', and as a whole, it becomes a cylinder having a convex cross section, which causes a large size problem. The object of the present invention is to provide a piezoelectric acoustic transducer having a structure which is easy to assemble in addition to the above-described disadvantages and is compact and compact. In order to achieve this object, the present invention resides in the construction of a piezoelectric acoustic transducer as described in the Tessen model registration request. FIG. 2 shows an embodiment of the present invention, and the case is composed of a case 11 which covers the opening l, a case 12 which pages the resonance cylindrical portion 6, and a back lid 2. In this case, a disk-shaped composite body 5 in which a 04-05-2019 1 diaphragm 8 'and a piezoelectric element 4 having silver electrodes 4 on the front and back sides are accommodated, the driving IJ circuit 7 is provided around the resonance cylinder 6 , And separated from the complex 5 by the partition wall 61. It is supported by the partition 6 'through the support 8 at the node of the composite 517i vibration. It is preferable that the support 8 be a foam, a rubber, an elastic contact, an agent or the like that does not suppress vibration as much as possible. Also, although the support position has conventionally been the inner end face of the resonance cylinder, the volume of the circuit portion 7 is larger if the partition 6 'is used rather than the inner end face within the range where the resonance effect is not destroyed at i degree as in the present invention. In addition to being able to take out, it is possible to make the overall size smaller and more effective. As shown in FIG. 2, the assembling method is also very much an hour wheel if it is separated from the front lid 11 'and the back lid 2'. Sound waves are transmitted to the outside through Table 11 and the space with a depth of d works as a resonance box, but on the contrary, it is emitted by providing an opening in the lid 2 and it is possible to close the opening of the front lid. It has the same effect. However, the volume is slightly lower. In addition, the front lid and the back lid are both open and external reflection is effective. Although the composite 5 # 'i is usually supported by the partition wall 6', it is also possible to support it from the front lid 11 and hold it in a sand-in shape, in order to make it resistant to external vibration and impact. In the piezoelectric acoustic transducer of the invention of Inno's invention, the composite body 5 is bent and vibrated to generate a sound wave, and resonated in the resonance cylinder 6 to increase the generated volume, as in the conventional device. According to the piezoelectric acoustic transducer of the present invention, only the composite body 5 is housed in the case 2, so the thickness of the case 2 can be thin, and the space portion of the outer periphery of the resonance cylinder 6 of the oscillator circuit 7 can be obtained. Because of the consideration, the overall size and size of the device has been reduced. =めることかできる。 That is, although the diameter of the case 2I of the conventional device shown in FIG. 1 is 60- and the total thickness of the case 2 'and the resonance cylinder 6 is 45 m, the device of this invention shown in FIG. In the apparatus, the diameter of the case 2 is 60 mm, which is the same as in the prior art, or the total thickness of the case 2 and the resonance cylinder 6 is 25%, and the device is compact or small. The thickness of the resonance cylinder 6 is about 15 Mm, the inner diameter of the resonance cylinder 6 is preferably about 28 fi, and the generated volume can be obtained as in the prior art. The effect of the present invention is not lost even if the shape other than the resonance cylinder 11 cylinder is changed, such as a square shape, and it is not continuous with the opening 1, and even if a slight slit or hole is provided 4 I can not do it. Further, the integration of the piezoelectric element 4 and the pregnancy moving plate 3 is also effective by methods other than bonding. 04-05-2019 2
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