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 JPH0746695 [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airborne ultrasonic transmitter-receiver, and more particularly to an airborne ultrasonic transmitter-receiver used for detecting an object and controlling traffic. [0002] 2. Description of the Related Art Heretofore, as shown in FIG. 2, an air ultrasonic transducer of this type has been used. When an electric pulse is applied to the piezoelectric ceramic 2, the piezoelectric ceramic 2 causes respiratory vibration in the radial direction to generate an ultrasonic wave. It is known that the direction of movement of the ultrasonic wave is converted by the reflection scale 1 and the phase adjustment equalizer 3 and the ultrasonic wave goes straight in the axial direction of the reflection scale 1. The directivity in the traveling direction is determined by the configuration, the shape, and the size of the reflecting bulk 1, the piezoelectric ceramic 2, and the phase adjusting equalizer 3. [0003] In the conventional ultrasonic transducer, when the shapes of the reflection bulk 1, the piezoelectric ceramic 2 and the phase adjustment equalizer 3 are determined, the directivity is determined according to the shape, and the directivity is determined. There is a drawback that 03-05-2019 1 the angle can not be changed. In the present invention, in order to eliminate these defects, as shown in FIG. 1, the directivity can be controlled by shaving the back surface opposite to the conical front surface of the phase adjusting equalizer into the conical recess 4 It is an object of the present invention to provide an airborne ultrasonic transducer capable of changing the pointing angle. [0004] [Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention is characterized by the use of a cone on the back surface opposite to the front surface in the direction in which the ultrasonic waves of the air conditioning ultrasonic transducer are adjusted. An aerial ultrasonic transducer capable of controlling directivity and directional angle by forming a recess is provided. That is, according to the present invention, an ultrasonic wave phase in a cylindrical shape generated by vibration of a piezoelectric ceramic is changed by the phase adjusting equalizer formed inside the cylindrical piezoelectric ceramic, and the shape of the back surface of the phase adjusting equalizer is changed. The ultrasonic wave phase can be varied. [0005] [Function] By configuring the phase adjustment equalizer having a conical concave portion on the back surface inside the cylindrical piezoelectric ceramic, the directivity and directivity angle of ultrasonic waves radiated into the air can be easily set to specific values. It becomes possible. [0006] An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a phase adjusting equalizer 3 according to an embodiment of the present invention. The phase adjustment equalizer 3 is a cone-shaped concave portion 4 with a diameter D3 and a depth h according to the present invention in which a cylinder having a diameter D1 and a length 11 and a cone having a diameter D2 and a height 12 are integrally processed. It is a structure provided with the diagonal grid in FIG. As shown in FIG. 2, the directivity of the ultrasonic transducer obtained by fixing the phase adjusting equalizer 3 shown in FIG. 1 according to the present invention to the inside of the cylindrical piezoelectric ceramic 2 is shown in FIG. The directivity pattern as shown is obtained. This is because the directivity angle (3 dB attenuation 03-05-2019 2 angle) changes from θ1 to θ2 as compared with the directivity pattern shown in FIG. 3A obtained when using a conventional phase adjustment equalizer that does not have a conical recess. . This is because, in the ultrasonic transducer having a structure as shown in FIG. 2, the phase of the ultrasonic wave generated inside the cylinder by the vibration of the cylindrical piezoelectric ceramic 2 is delayed by the conical recess 4 of the phase adjusting equalizer 3 It is an effect. Therefore, an arbitrary directivity pattern can be obtained by changing the shape (diameter D3 and depth h) of the conical recess 4 of the phase adjustment equalizer 3. As described above, according to the present invention, it is possible to provide an ultrasonic transducer having an advantage that the directivity pattern can be controlled by using the conical recess 4 as the phase adjustment equalizer 3 in the ultrasonic transducer. It became. [0007] As described above, according to the present invention, only by processing the back surface of the phase adjustment equalizer, which is a component of the air ultrasonic transducer, into a recess without changing the overall shape. The directivity angle of the air ultrasonic transducer can be easily controlled. 03-05-2019 3
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