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 JPS5234762 Chief of Patent Office 1. Patent specification 1 patent, drawing 1 design 3 and applicant application copy 1 patent 5 Inventors other than the above specifications ■ Japan Patent Office ■ Japanese Patent Publication 52-34762 Title of invention Method of manufacturing ultrasonic transducer 3. Detailed Description of the Invention In the present invention, the resonant frequency f of the matrix vibrator. r high and low. By providing a radiation tool in the image frequency band. An object of the present invention is to produce an ultrasonic wave transmission tool t ′ ′ having a wide band by causing resonance. Conventionally, as having a wide band characteristic, an aluminum plate 22 is sandwiched between two piezoelectric ceramics 21 (hereinafter simply referred to as ceramic) as disclosed in JP-A-49-77664 or National TechniCal Report Vol 2143 Junθ1975 pages 400-410. It is known as an ultrasonic wave transmitting and receiving tool having a characteristic shown in FIG. 2 (a) and a longitudinal sectional view as shown in FIG. 2 (a). However, when the ultrasonic transmitting and receiving tool is manufactured by the method of the present invention, when the center frequency currently most frequently used is relatively low at 40 KH2, a defect of the ninth order occurs. 1. The ceramic is extremely fragile and can not match the center frequency determined by the mechanical dimensions unless it is finished with a thin thickness of 0.2%. For this reason, there is a high risk of breakage in the processing step, and even extremely small pinholes (the problem does not occur if the thickness is 0.3% or more even in the polarization processing step for activating the ceramic). In many cases, dielectric breakdown occurs and the yield of the product is extremely reduced. 2. Even if the thickness of the aluminum plate is made sufficiently thin, for example, to 0.1 or so, the diameter becomes large at 15.0%, so handling in the manufacturing process is difficult and problems such as deformation of the plate occur. Do. EndPage: To solve the problem of 此 <Conventional 04-05-2019 1 research has been conducted by the present inventors (for example, page 93 to page 96 in November 1977, ············ Electronic ceramic) The structure of the wide-band sensitivity characteristics As a result of repeating examination of the ultrasonic wave transmitting and receiving tool provided, the present invention has been provided. The details will be described below. The impedance characteristics of the matrix vibrator in which the ceramic and the metal plate are joined as shown in FIG. 1A as one embodiment of the present invention has resonance points in the vicinity of 35KH and 176KH as shown by broken lines in FIG. The sensitivity characteristic of the sound wave transmitting and receiving tool is extremely inferior as shown by the broken line in FIG. C and is not practical. However, according to the method of manufacturing the ultrasonic wave transmitting and receiving tool according to the present invention, that is, a broad band can be obtained by providing the radiating member 13 in the shape of a dotted line on the matrix vibrator consisting of the joined body of the ceramic 11 and the metal plate 12. In order to obtain the sensitivity characteristics of Conventionally, there has been one that conforms in appearance to such a shape, but the electrical characteristics of the conventional one are all singles even after the radiation tool is placed near the resonant frequency band of the matrix vibrator. None of the resonators having one resonance point and one generating resonance on both sides of the high and low resonance frequencies of the mother vibrator according to the present invention were none. The sensitivity characteristic of the impedance characteristic difference of the integrated body in which the trumpet shaped radiation tool 13 is mounted at a predetermined position on the mother vibrator is as shown by a solid line in FIG. Specific examples of the present invention will be described numerically. First, as a ceramic vibrator, one having a main component of pbo (Zro, 47 + T1o, h-701 +) was subjected to finish polarization treatment on a disc having a diameter of 9.5% and a thickness of 0.3% according to a predetermined method. On the other hand, as a metal plate, aluminum hardness H grade is selected to form a disk having a diameter of 12.0% and a thickness of 0.3%, and they are superposed and joined with a polymer resin to form a matrix vibrator. Finally, an aluminum foil 4 was processed to a maximum diameter of 8.0% of the radiator-like radiation tool (γ angle was 168 ° as much as possible, and it was joined to the position where the amplitude of the above-mentioned mother vibrator is maximum). As a result, the resonance characteristics in the effective frequency band of 40 ± 10 KHz targeted by the ultrasonic wave transmitting and receiving device were as follows. "for" "resonance frequency of the mother oscillator foa = anti-resonance frequency of the mother oscillator ftri = effective first resonance frequency of the total oscillator ftart" "effective first resonance frequency of the total oscillator ftr2 = effective first of the total oscillator The characteristics of the integrated oscillator and the resonance of the integrated oscillator are as indicated by a dashed line and a solid line in FIG. It is clear from this result that it is possible to obtain high sensitivity and wide band characteristics as the sensitivity characteristics of the integrated transducer as an ultrasonic transducer. According to the present invention, it is possible to make the metal plate 150% thick and 300 * thicker than the conventional thickness in the same manner as the Miku disk. As a 04-05-2019 2 result, the ceramic yield is high, and the handling of the metal plate has the effect of stabilizing and improving the manufacture of the sea-ultrasonic transducer which is safe. In this description, a disk is used as a mother disk for describing a ceramic as a matrix vibrator, but the positional relationship between the metal plate 32 and the ceramic 31 is as shown in FIG. 3 in a polygon plate other than a disk. On the contrary, as shown in the same figure, two ceramic plates 31 and a ceramic plate or an alumina ceramic 4! The manufacturing method of the present invention is included in the manufacturing method of the present invention, in which the mother vibrator is used to form the mother vibrator, but the resonance points are generated on both sides of the resonance frequency of the mother vibrator depending on the bonding of the radiation tool. The ultrasonic transmitting and receiving tool manufactured by the present invention is industrially valuable for use in the broad fields of related industries that require multiple channels. 4. Brief description of the drawings FIG. 1a shows an example of the ultrasonic transducer according to the present invention in a longitudinal sectional view, 11 shows a ceramic 12 a metal plate 13 is a radiation tool, c shows impedance characteristics and sensitivity characteristics, respectively. Show. FIG. 2 shows an example of the prior art as described above, and 21 is a ceramic plate 21 made of metal. FIG. 3 is a longitudinal sectional view showing another example of the matrix vibrator of the present invention. Patent applicant 94 # Iea & 11 axis \ b 萼 1.11 in 7 a # # σ-· C 21st! 2I 穿 Ra EndPage: 3 04-05-2019 3
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