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JPS54115929

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DESCRIPTION JPS54115929
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows the structure of a conventional
transducer, FIGS. 2A-2C show directivity characteristics, FIGS. 3A, 3B and FIG. 5 is a diagram
showing changes in directivity characteristics, and FIGS. 4 and 6 are diagrams showing the
configuration of an embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION The present invention is a super-smooth wave #L
device for extracting an object shape by a reflection signal of an ultrasonic wave, in particular, an
ultrasonic wave transmission / reception thereof. Mind about the bowl. Conventionally, various
devices # for extracting an object shape at high speed by arranging a plurality of elements on a
straight line and selecting the elements by switches are known. However, according to the
configuration VC in n't, it exists other than the target direction. The reflection signal from the
object is strongly received, and sufficient-, (1) one square stripe, <, t-, / 7 or '72' ps rudder is not
obtained. In this paper, each element shape r is arranged. By making it 1 L, the configuration is
made such that the sensitivity to the direction other than the target direction is 1 F at the large
end. According to the present invention, the element shape is made into a rhombus by seeking
the cause of the generation of the unnecessary sensitivity, and the element shape is reduced to
1/3 佳 KVC as compared with Vc. Hereinafter, this will be described in detail with reference to
the example of the present F1. FIG. 1 shows the structure of the currently used transmission /
reception JX unit. Is a normal size via = 0.5Nb = 1, C "10 (Shin) 捏度, the material is a-Acid bookor barium titanate well. As described above, one of the elements 1 to n of a part of the ship is
selected to perform one-wave (il-wave transmission). A place to drive the valley element at the
same time. As shown in FIG. 2C, the number of pieces is 1, and the number of pieces is 1, n! L 巌
sequence book in intimacy R. (0)iLfi−。 It can be determined as the product of n (s)-=
knee i, F '' 1 (2)->-and a single element finger lo] characteristic S (θ) sin γ S (θ) =-and a large
sensitivity only in the target direction It is a good characteristic to show. However, according to
such simultaneous driving, there has been a problem with resolution when performing acoustic
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wave transmission 4 at a short distance. Usually, a configuration is adopted in which the driving
time of the element l-yn is different to emit a concave acoustic wave front. こ。 In the case of the
arrangement point-like i source directivity characteristic R (which changes to become R / (θ)
shown in FIG. For this reason, when converging sound source gold waves are generated, large
unnecessary sensitivities other than the target direction occur as shown in K ('i third 7B).
Therefore, the configuration of the present invention is as shown in FIG. Here, each element is
configured to have an inclination angle with respect to a direction 0 'orthogonal to the direction
(@ 4 FIG. X) of the element arrangement (r4). If such an element is adopted, the directional
characteristics S ′ ′ of the element alone in the M11 plane corresponding to S (θ) in FIG. 2
BVCk (where θ is the volume velocity of the element surface −1, (3 , A--the Fourier transform of
the projection (becomes a triangle) on the array axis X, as shown in FIG. 5B.
Since this characteristic S ′ ′ (#) vi projection waveform is a triangle, 5LllγS ′ ′ (θ) = 1
−−) 2γ is obtained, and the directional characteristic ri fifth is given by the product of R ′ (#)
and S ′ ′ (0). It becomes like figure C. It understands by the above. In order to be 乙, it is
possible to arrange the elements in an inclined manner, so that the anxiety sensitivity to VC other
than the target direction is fortunately low. It becomes oT ability to do. The above explanation
has been made for #I oblique parallel quadrilateral as shown in FIG. 6, but this is not good. The
principle by which the sensitivity is required to be expanded can be understood by the
explanation so far. In the substrate, the maximum -d of the element is larger than that of the
element b. It is by having made town R hi. . From this, the present invention is not limited to the
rhombic shape described above, and it is obvious that the same effect can be obtained for the
element shape V'C having a maximum element size larger than the arrangement pitch. is there. In
particular, the configuration in which the rhombus stack side is used has the advantage that
when cutting and arranging elements in order to prevent sound # photographing dynamic
coupling between the torsos, the cutting machine has the advantage of simplifying the force
reduction process. doing. Also, as shown in FIG. 6, when the relationship d = 2 b is selected, as
shown in FIG. 5, the zero point of S “(0) and the point of b ′ (0) coincide, and the unnecessary
sign The degree of repression becomes large. In addition, as a method of element division,
cutting and dividing of the piezoelectric body. It is also obvious that the same effect can be
obtained by making only the electrode divided into four by N4 instead of any other method. .
Although the above description mainly describes a transmitter, the reversibility of the sound
wave and the conversion element makes it naturally applicable as a receiver.
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