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 JPS57152900 BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1a and 1b are cross-sectional views of the conventional piezoelectric sounding body in the case of peripheral support and nodal support, and FIG. 2 is a graph showing sound pressure-frequency characteristics of the conventional piezoelectric sounding body. FIG. 3 shows an example, FIG. 3 is a sectional view showing an embodiment of the piezoelectric sounding body according to the present invention, and FIG. 4 is a sectional view showing another embodiment of the present invention. FIG. 5 is a view showing an example of the sound pressure-frequency characteristic of the piezoelectric speaker according to the present invention. 5.6 · · · · · · · · · Piezoelectric porcelain plate, 7, 8 · · · · · · · · · · · · · · · · · · · · · · · · · · Case. [Detailed description of the invention] The present invention has a monomorph structure in which a piezoelectric ceramic plate and a metallic thin plate having a metal root are laminated, and a hymorph structure in which a piezoelectric diaphragm and a pressure magnet are temporarily laminated. It is an object of the present invention to provide a piezoelectric sound generator 1862r + v * which has a structure that generates sound by using a sound pressurefrequency special diaphragm of this piezoelectric sounding body as a vibration source. The conventional piezoelectric sounding body has a structure in which one piezoelectric diaphragm is held by the case 3 as shown by the curved surface of this structure in FIG. 1, and FIG. 1 supports the periphery of the diaphragm The structure shown in FIG. 1 is a structure for supporting the vibration fIIIs of the diaphragm. In the figure, 1 is a piezoelectric ceramic plate, 2 is a metal plate which is bonded to the piezoelectric ceramic plate 1 to form a piezoelectric transmission plate, and 4 is a signal voltage applied to the electrodes (not shown) of the piezoelectric ceramic plate 1 Lead wire. The piezoelectric body is characterized by very low power consumption, light color and light weight, and has been used in many devices in recent years as a booster for generating single-frequency sound. However, this conventional piezoelectric issuer has a resonance plate which is very sharp in the case of a vibration plate. As shown in FIG. 2, it is very high around the 11-05-2019 1 resonance frequency equation, and the level change due to the I @ wave number is extremely large. Therefore, when using this sounding body as melody-) as a single force, only the sound with a specific number of gate enemies is emphasized, so it is a major drawback in reproducing natural sound 1873. It had become. The present invention eliminates such a conventional defect and flattens the peripheral liquid number characteristic of sound ratio to provide a one-tone sounding body capable of reproducing natural melody and voice. The king according to the present invention [11, the sounding body is in one case multiple pressure of pressure 'pregnancy 11! The most important feature of the present invention is to attach & !, which will be described below with reference to FIG. In FIG. 3, 6 and 6 are piezoelectric ceramic plates. Numerals 7 and 8 are metal plates laminated with the piezoelectric ceramic plate 5.6, respectively, and the first piezoelectric diaphragm is constituted by the piezoelectric ceramic & 6 and the metal plate 7, and the piezoelectric ceramic plate 6 and the metal plate 8 The two piezoelectric vibrators & make up, cn et al. The two piezoelectric diaphragms are their size and thickness. The number of resonance frequencies is set to be different from each other by C which makes the material etc. different. The piezoelectric diaphragms 2 ') are respectively supported by the peripheral support at an interval of F9T between the thickness directions of the case 9 and the case 9 is provided with a through hole 11.12. And 10) are leads for simultaneously applying a signal withstand voltage to the electrodes of the piezoelectric ceramic plate 5.degree. The first and second piezoelectric diaphragms vibrate independently of each other due to the signal-pressure applied by the first capacitor 10 in 1884 tables, and the resonance frequencies of the first and second piezoelectric diaphragms are different. Can be formed by adding the sound pressure '# property of the two piezoelectric diaphragms. That is, at low frequencies the sound pressure by the first piezoelectric diaphragm compensates for the sound pressure by the second piezoelectric diaphragm, and conversely at the frequencies at which the sound pressure by the second piezoelectric diaphragm is low the first piezoelectric diaphragm It can compensate for the sound pressure. FIG. 4d shows another embodiment of the piezoelectric sounding body of brown, in which two piezoelectric diaphragms are supported on the case 9 at the vibration nodes respectively. In FIG. 4, the same parts as in FIG. 3 are indicated by the same numbers. In the above-described FIGS. 3 and 4, the piezoelectric diaphragm is exemplified by a monomorph forgery in which a piezoelectric ceramic plate and a metal plate are bonded together, but the present invention is equivalent to a bimorph structure in which piezoelectric ceramic plates are mutually bonded. It goes without saying that the effects of In addition, it is possible to use an elastic thin plate such as another film-shaped diaphragm instead of the gold foil temporarily. Furthermore, the number of piezoelectric diaphragms does not have to be two, and a large number of piezoelectric diaphragms with slightly different resonance frequencies may be used, and the level change due to the frequency of sound pressure can be made smaller as the number of piezoelectric diaphragms deviates. . When two piezoelectric diaphragms are used, the first resonance frequency at which the sound pressure of the first piezoelectric diaphragm decreases and the first resonance frequency of the second piezoelectric diaphragm in the middle of the 11-05-2019 2 second resonance frequency 畝 Q It is most effective to set An example of the sound pressurefrequency characteristic in this case is shown in FIG. The piezoelectric brother according to the present invention can be compared to the conventional piezoelectric N sound by compensating for the sound pressure with each other because of the use of a small number of piezoelectric vibrations @ different in co-image frequency as in the characteristic of FIG. Can you significantly reduce the level change due to sound pressure l @ l [ff, melody or sound? If you want to play faithfully will be able to play, it is very useful and practical. 11-05-2019 3
© Copyright 2021 DropDoc