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JPS4959

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DESCRIPTION JPS4959
■ Ultrasonic wave radiation device 特 願 Japanese Patent Application No. 43-3, 3841 [Phase]
Application No. 43 (1968) May 20 @ Kiyoshi Kuwahara 0 Applicant 52 Kono Kiyotaka Nishihara
City Kuwahara-cho 9 52
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a conventional
apparatus of this type, FIG. 2 is a block diagram showing an embodiment of the present
invention, and FIG. 3 is an explanatory diagram of an equation for deriving directivity factor, FIG.
FIG. 4 is a characteristic diagram showing the change of the frequency-deflection angle in the
case of the transducer array according to the present invention.
DETAILED DESCRIPTION OF THE INVENTION The present invention provides an ultrasonic
radiation apparatus capable of changing the pointing direction of an ultrasonic beam in a simple
manner as compared with the conventional apparatus. FIG. 1 shows a conventional device, in
which S is a high frequency power supply for driving a magnetostrictive vibrator, P1P2... Pn is a
phase of high frequency current output of the high frequency power supply S sequentially 0, ±.
······· Phase adjusters AI, A2 · An for phase shift by ± (n1) are magnetostrictive vibrators of the
same structure, respectively, spaced apart from each other in the z-z 'axis direction They are
arranged to constitute one transducer as a whole. In the above apparatus, the phase adjuster Pi,
B2... Pn causes each of the transducers AI, A2... An to have a phase with a fixed difference of
ejWLej (wt−ψ == ej (wt− (n−1) cp). High frequency current is sequentially supplied to
generate an ultrasonic wave, and if it is expressed as an angle θ measured from the X axis
direction perpendicular to the Z axis as in the case of the directional antenna, The acoustic beam
deflection angle θ increases as the value of the phase 増 加 increases. [111111] In the abovementioned device, since a phase adjuster is required for each vibrator, there is a drawback that
the device is complicated and enlarged. The present invention eliminates these disadvantages
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and is illustrated by the following examples. In FIG. 2, S1 denotes a variable frequency power
source P for driving a magnetostrictive vibrator, variable frequency knob, AI. A2. A3... An are
identical to each other in the z-z ′ axis direction and spaced apart from each other in the X axis
direction with an interval of an integral multiple of the distance λ1. It is a magnetostrictive
vibrator of structure, and constitutes one transducer as a whole. B1 ° B2, B3 · · · · · · Bn has open
ends in the same plane, a shielding box having the above vibrator closed end. In the above
apparatus, if it is assumed that the variable frequency power source, the frequency f1 of S1 or (V
is the ultrasonic propagation velocity in water of about 1'500 rn / s), the magnetostrictive
vibrator AI excited by high frequency current, A2. A3 ... An ultrasonic wave transmitted from An
is shielded box B1. B2. Since the open end face of B3... Bn is all in phase, the phase of the
supplied current in the apparatus of FIG. 1 is the same as in the case of 00, and the incident
ultrasonic beam deflection angle θ is O It is. If the frequency f of the variable frequency power
source S1 is fl <f this time, the ultrasonic wave emitted from the transducer of A2 is Δλ (Δ)
with respect to the ultrasonic wave at which A1 is also emitted at the open end face of the
shielding box B2. The phase is delayed by the stroke of λ−λ1−λ, λ−T).
Similarly, the ultrasonic waves A3 and A4... An are delayed by phases of 3Δλ and (n-1) Δλ,
respectively. This is a high frequency current with a constant difference of ejwt, ej (wt-ψ) ... ej
(wt-(n-1) に) to the magnetostrictive vibrators AI, A2 ... An, respectively, in the explanation of Fig.
1 above. Are sequentially supplied to generate ultrasonic waves, and the radiation ultrasonic
beam deflection angle is + θ. Therefore, θ increases as the frequency f of the variable frequency
power supply S1 increases. Conversely, if the frequency of the variable frequency power source
S1 is f1 ': A [111111] EndPage: 1, the ultrasonic wave emitted from the transducer of A2
becomes the ultrasonic wave emitted from A1 at the open end face of the shielding box B2. On
the other hand, the phase advances by a stroke difference of Δλ (λ 1 −λ). Similarly, the
ultrasonic waves from A3... An advance by the phase of 2Δλ... (N−1) Δλ, respectively. This is
for the magnetostrictive vibrators AI and A2-An described in FIG. 1 respectively. It is equivalent
to that of generating a high frequency current with a constant difference of jwtl, j (wt + ψ)... ej
(wt + (n1) ψ), and the radiation ultrasonic beam deflection angle becomes -θ. −θ increases as
the frequency f of the variable frequency power supply S1 decreases (as it decreases). In order to
make the above description clearer, FIG. FIG. 3 shows an example in which four rectangular
vibrators are arranged with the above-mentioned relationship and the shielding box is omitted.
The directivity factor in this example is expressed by equation (1). In equation (1), K is a constant
by wavelength, θ is an angle from the front, d is a center distance between two adjacent
vibrators, α is an angle determined by a fundamental wavelength and a, R is the abovementioned rectangular vibrator The directivity coefficient in one case is expressed by 5 in (Ka sin
θ) R = (2) Ka sin θ. Here, each symbol of the equation (2) has the same meaning as the equation
(1), and a is% of the length of one side of the rectangle. When changing from [111111] to 65
KHz, θ changes in the relation shown in FIG. Here, assuming that the angle is 0 ° in the front,
θ taken in the clockwise direction is θ, and the angle taken in the counterclockwise direction is
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1 θ, in the graph frequency range of 50 to 65 KHz, the θ direction, 40 to 50 KHz In the range,
it can be seen that the direction of the -θ force changes. As described above, according to the
present invention, it is not necessary to use a phase adjuster (by changing the distance between
the radiation surfaces of the transducers and arranging them, and changing the power source
frequency to change the ultrasonic beam deflection angle). Because it can be varied freely, an
extremely easy-to-handle and compact device can be created as compared to the prior art.
In the case of the above embodiment, the radiation surface of the vibrator is displaced to align
the opening end face of the shielding box. Conversely, the same effect can be obtained by
aligning the radiation surface and shifting the opening end face of the shielding box. Also, in the
example of FIG. 2, the shielding box is not necessarily required. It is desirable to use a wide band
as the above-mentioned vibrator.
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