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 JPS5421531 BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional ultrasonic transducer, FIGS. 2 to 4 show an embodiment of an ultrasonic transducer according to the present invention, and FIG. 3 is an exploded perspective view, FIG. 4 is an explanatory view showing the dimension symbols of the main members, FIG. 5 is a sensitivity characteristic diagram of the conventional example, and FIGS. 6.7 and 8.9 are both sensitivity characteristics in this embodiment. FIG. 10 ··· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · composite oscillator, 11 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · additional resonators, 13 · · · · · · · · · · · · · · Recessed part. DETAILED DESCRIPTION OF THE INVENTION The present invention is an ultrasonic transducer ho for transmitting or receiving ultrasonic signals suitable for use in a remote control device of a television receiver, an alarm or the like. In particular, the present invention relates to a transmitter / receiver for obtaining a large transmission / reception MIl & degree over a wide frequency band. As this bridge ultrasonic transducer, a longitudinal cross-sectional trapezoidal shaped additional resonator (hereinafter referred to as a "bed-carving co-imager") or an aluminum-foil-shaped additional resonator (hereinafter referred to as a "rib-cone") is made There is known a book provided with a canon resonator). And the one using the latter aluminum canon resonator is (t) 5. , / F 3 / gi sensitivity c main sensitivity) and the frequency between the frequency point with small sensitivity but the frequency point with the second sensitivity (sub M degree) is very wide, the middle frequency region It is extremely difficult to obtain a large sensitivity over a wide frequency band, since most practical and usable sensitivities can not be obtained. On the other hand, in the former case where nine resin trapezoidal resonators are used, the frequency gap between the frequency point at which the sensitivity of all is obtained and the frequency Ik at which the sensitivity of @ 2 is considered is relatively narrow. Wide frequency bandwidth is satisfactory). By devising the shape of the trapezoidal resonator, a sensitivity (delivery) of a degree of @ 5 FIG. 17 can be obtained. As indicated by a single point of this 04-05-2019 1 sensitivity, the characteristics over a wide frequency band show the results of measurement conducted on the transducer having the structure shown in FIG. In FIG. 2K, a composite vibrator 1 is formed by fixing a resin-made trapezoidal resonator 6 near the center of one side of the ceramic bimorph vibrator 2. The composite vibrator l is fixed by interposing the support member 5 in the dark of the substrate 4 h K, the substrate 4 and the bimorph vibrator 2 (2). 6 is a shield plate and 7 is an outer case. Then, by further increasing the sensitivity of the intermediate region between the frequency points where two large confusions can be obtained, a hole is provided near the center of the 1: part of the trapezoidal resonator 3 to obtain a large sensitivity on the high frequency side. It is sufficient to stop lowering the frequency band. The sensitivity curve of this message is shown in FIG. This property is practically satisfactory. However, when an external cait-off is attached as shown in the first place, the sensitivity characteristic is greatly attenuated in the intermediate frequency range as indicated by the solid line in FIG. ! It is obvious that it can not be put to practical use as a container. Therefore, this idea is to attach large size g, ii over a wide frequency band by attaching a composite vibrator provided with a trapezoidal co-imager made of a ceramic bimorph vibrator to a recess formed on a substrate. It is an object of the present invention to provide an ultrasonic transducer. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In FIG. IIE 21 and 5, 10 is a composite vibrator, which is formed by bonding a resin additional condenser 12 with an adhesive to the central part of one side of a square (3) plate-like pressure tk ramic bimorph oscillator 1. The bimorph oscillator 11 is formed by bonding two piezoelectric upper-lamic plates 4 together, and the additional co-observer 12 has a trapezoidal cross-section with a vertical cross-section of 1111 in a circular cross-section. The short side surface of the trapezoid is in contact with the bimorph oscillator 111C, and the long side surface functions as an ultrasonic wave transmission (or reception) surface. Reference numeral 13 denotes a substrate, and a circular recess 14 is provided on one side. The bottom surface -K in the recess 14 and the composite vibrator 10 are attached via a cylindrical rubber support member 15 between the bimorph vibrator 1m and the bottom surface. Also, even if the composite m motor 10 is attached to the rubber support member 15 with an elastic adhesive, the vibration of the bimorph oscillator ll is relatively free. Also, these rubber support members 15 or elastic adhesive may be located on the two-drum of the bimorph vibrator 11. An external lead 16.17 is inserted and fixed to the substrate 16. Each lead 16 and 17 is connected to the counter electrode of the bimorph oscillator +1. (4) 18 is a ground plate which is in contact with the back surface of the substrate ISO. One of the resistors 16 is isolated and the other resistor 17 is connected by soldering. A case 19 is press-fitted and fixed to the outer periphery of the substrate 13 to cover the members. In the case 19, a hole 20 is provided at a position facing the ultrasonic wave transmission / reception of the composite vibrator 10, and a rope-like member 21 is attached to the hole 20. Reference numeral 22 denotes a hole provided in the ultrasonic wave transmitting / receiving surface of the additional resonator 12, which can reduce the Jf4 wave number position of the Il & degree generated on the high frequency side. The person 22 may be 04-05-2019 2 appropriately provided according to the desired characteristics. Next, specific examples will be described. If the dimensions of the main members are set as follows by heating 1 in FIG. 4, the wave receiving sensitivity characteristic shown in FIG. 6 is obtained. L=tO,2aawT! = Q, 6 stores D = 11, ah = 1.2, u6 =! 7 '塾 ゝ d = 15. 1 處 111 t, = 2.04 m Distance between the bottom of the concave portion and the bimorph 20, 7 · 1 菖 6 As is apparent from Fig. 1, according to (5) of the specific embodiment, the conventional one (Fig. 5) The sensitivity of the intermediate frequency region is more pronounced compared to. This can be guessed as follows. That is, the vibration seen from the ultrasonic wave transmission / reception wavefront is in the mode (upper and lower vibration) near 20 KHz at which the sensitivity on the low band side is generated, and in the near proximity to 25 KH2 at which the MW in the high band is generated. Since it is a bending mode, it is presumed that a vibration combining both 7-do will occur in the intermediate frequency region, and the vibration of this combining mode will cause a lateral-fl motion, and this bond direction taking al I component The ultrasonic wave μs is also reflected on the side wall of the recess 14 and it is considered that the predetermined ultrasonic wave traveling direction ( ′ ′ ′ ′ ′ ′ ′ ′ ′ ′ ′ ′ f ′ ′ 1 · ** osf # il [tr + or 6 ′ ′ 18 ′ ′ acoustic wave is necessary to Be Furthermore, if the shape of the recess 14 is changed while the first-party vibrator 10 has the same shape, the sensitivity characteristic changes as shown in FIGS. That is, FIG. 7 shows the depth t, t = 1.8.1.6. In the case of changing j, a (m), FIG. 8 shows the case of changing the diameter d to d = 15.3.155.15.degree.15.9 (fl), and FIG. In the figure, as shown in FIG. 4 (d), the ridge 1 of the recess 14 is inclined. (6) A case where the angle a is changed to% tx = 75.60.53.30. As apparent from FIGS. 7-9, the shape of the recess 14 changes the lI & MlllP property, so the optimum shape of the recess 14 for the composite vibrator used needs to be determined experimentally. In fact, as a result of conducting experiments on various plating transducers, it is possible to find the optimum shape of the concave portion for obtaining sensitivity that can be practically used in response to KI. E In the embodiment described above, the bimorph oscillator ll may have a disk shape, the cross section of the additional resonator 12 may have a polygonal shape, and the recess 14 may have a circular shape. It is As described above, according to the present invention, since the composite vibrator provided with the resin additional resonator at the center of the bimorph vibrator is attached to the recess of the substrate, the effect of obtaining high sensitivity over a wide frequency band is obtained. It is useful and practical. 04-05-2019 3
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