JPS5748894

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DESCRIPTION JPS5748894
Description 1, title of the invention
Ultrasonic transducer having variable directivity characteristics
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of
varying the directivity characteristics of an ultrasonic transducer. There is a lot of data on basic
directivity characteristics for acoustic equipment as well as ultrasonic transmitting and receiving
tools. (For example, A (0: 0 UST Engineer CALENG N 'EKRI: NG. HARRYF, OLS'ON, Pl (, D:
Acoustical Engineering, + ,, by Lee F., Olson) The feature of the present invention is that a bellshaped reflector or the like is used without changing the aperture diameter of the ultrasonic
transducer as in the prior art. The directional characteristics can be changed by changing the
relative positional relationship between the reference numeral 11 and the cone-like reflector 1.
The details will be described in the following. The variable directivity mechanism in the
ultrasonic transducer according to the present invention will be described with reference to the
basic structure for the sake of clarity. As shown in the longitudinal sectional view of FIG. 1, a
reflector 11 of a bell-shaped convex ultrasonic wave signal is applied to an irradiation portion of
a primary ultrasonic wave signal of the transducer 1-10 which is a generation source of the
ultrasonic wave signal. The screw is mounted in a state where the position can be moved back
and forth with the screw screw 11-1 etc., and the relative positional relationship with the coneshaped reflector 12 at the periphery is changed to obtain the target directivity characteristics. Fix
it. As a result, it is considered that the directivity of the ultrasonic signal changes because the
reflection angle changes as shown by the solid line and the dotted line. The concrete contents
will be described in accordance with an embodiment of the present invention. EndPage: A
transducer 10 for 4 OK Hz is prepared and attached to the punched metal plate 13 in the
opening, and the height is 12 mm at the lowermost part A 30 mm long, 5 mm diameter I, S ', O,
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screw 11-1 is embedded in an Ω-type reflector 11 with a diameter of 14 mm (SO SOME'l'R C 35
° 16' type 1 silver), this screw Is inserted in the hole of a 5mm diameter female screw provided
at the bottom of a cone-shaped peripheral reflector 12 with a hole diameter of 45 mm, a base
diameter of 15 mm, and a depth of 20 mm, and the bell type reflector The directivity
characteristics when the distance d of the bottom of the 11 bottom 逅 cone type reflector 12 is 0,
3, and 5.8 mm, as shown in FIG. I can say that I can. That is, when it is necessary to increase the
level on the central axis, d = 8 + nm. In order to make the level on the central axis lower than the
other parts, it is d-crest. It is possible to obtain a wide range of such directional characteristics by
adjusting the positional relationship between the bell reflector 11 and the cone reflector.
Although the text of the detailed description of the ultrasonic transmitting and receiving device is
described in detail, FIG. 3 is an enlarged view of the principle of the present invention, and these
ultrasonic transmitting and receiving devices are naturally included in the scope of the claims.
The ultrasonic transmitting and receiving tool of the present invention is industrially valuable
because it can be expected to be used in an extremely wide application range, such as a sensor
for detecting an illegal intruder or a sensor for a safety device of a traveling object.
4. Brief description of the drawings FIG. 1 is a longitudinal sectional view showing an
embodiment of the ultrasonic transducer according to the present invention, the number 10 is an
ultrasonic transducer, 11 is a bell reflector, The screw 12 is a cone-shaped reflector, and 13 is a
punched metal plate with an opening. FIG. 2 is a diagram of directivity characteristics. FIG. 3 is a
longitudinal sectional view showing an example of an ultrasonic transmitting and receiving tool
to which the concept of the present invention is applied. Patent Applicant Nippon Ceramic Co.,
Ltd. Representative Yoshiharu Taniguchi EndPage: ２
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