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DESCRIPTION JPS62271600

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DESCRIPTION JPS62271600
[0001]
3. Detailed Description of the Invention [Industrial Field of Application] The present invention
relates to a sound wave generator capable of directional electronic control. [Description of the
Related Art] There are a speaker, a magnetostrictive sounding body, a piezoelectric sounding
body and the like as a sound wave generator, among which the piezoelectric sounding body is
small, light, robust, inexpensive, and relatively high in conversion efficiency. Applications are
rapidly expanding, mainly for simple applications. [Problems that the invention solves and
attempts to use] Piezoelectric sounding body is expected to be applied to the measurement field
using ultrasonic waves, but its application range is limited because it is difficult to control the
directivity of radiated sound waves. There is. Conventionally, there is an example in which the
piezoelectric elements are linearly arranged to control directivity, but in the method of Sakai,
there is a problem that the range in which the directivity can be controlled is limited to a specific
surface of space. The present invention has been made to solve the above-mentioned problems,
and an object thereof is to provide a piezoelectric directional acoustic wave generator having a
wide range of controllable directivity. [Means for Solving the Problems] The piezoelectric
directional acoustic wave generator according to the present invention comprises a piezoelectric
element arranged concentrically in an annular shape, and an excitation for exciting these
piezoelectric elements by an electrical signal which delays the time delay from each other. And
the . [Operation] In the invention of 乙, a plurality of concentrically arranged piezoelectric
elements are sequentially excited by the No. 48 having a time delay from the exciter, and the
sound waves emitted from the piezoelectric elements are overlapped, 1 Be put together, get a
directivity. An embodiment of the present invention will now be described with reference to the
drawings. 1 (a) and 1 (b) show an embodiment of the present invention, and FIG. 1 (a) shows a
front view of a piezoelectric element and a connection circuit of its exciter, FIG. 1 (b) These show
the side view of a piezoelectric element. In this figure, reference numerals 11, 12, 13 and 14
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denote concentrically arranged piezoelectric elements, which are formed on the substrate 10. 21
and 22.23 have delay time τl respectively. τ2. τ3. A delay element of τ 4 and a signal source
25 constitute an exciter 20. Next, the operation will be described. The delay times r1 to τ4 of
the delay elements 21 to 24 are r, = (a-1-2b) "/ 2 x Sr 2 = 4 b (a + b) / 2 x S rs = b (2 a + 3 b) / 2 x
S τ 4 = 0, where S: Speed of sound a: distance between piezoelectric elements 11 and 12 b =
distance between piezoelectric elements 12 and 13 and 13 and 14 X: distance between central
axes −V. In the above, when the output signal from the signal source 25 is applied to the
piezoelectric elements 11 to 14 through the delay elements 21 to 24 and sequentially excited,
the sound waves radiated from the piezoelectric elements 11 to 14 are shown in FIG. As shown in
b), the time difference of the signals and the spatial path difference cancel each other at the
central axis 1 distance 11tx, and the sound waves strengthen each other and concentrate here.
FIG. 2 shows a front view of a piezoelectric element showing another embodiment of the present
invention and a connection circuit of its exciter. The same symbols as in FIG. 1 (a) and (b)
indicate the same parts in the figure of the eyebrow. 25 to 30 are delay elements, and the delay
time is τ5 to τ10. In the embodiment of the present invention, the concentric piezoelectric
elements other than the central part are equally divided into three equal parts 12a. 12b、
12c、13a、13b、13c、14a。 14b and 14e, and the piezoelectric elements 12m
and 13a. The outputs of the delay elements 22 to 24 are applied to the a 714 a, and the outputs
of the delay elements 25 to 27 are applied to the piezoelectric elements 12 b, 13 b, and 14 b.
The output of the delay elements 28 to 3 o is applied to 14 C. Therefore, as in the case of FIG. 1,
the delay time of each delay element is y = (a + 2b) ′ ′ / 2 × Sτ 2− 5 = 7. = 4 b (a−10−b) /
2 × sτ3 = τ6−τe = B (2a + 3b) / 2 x Sr 1-r 7-τ 1 = 0 where S: speed of sound a = distance b
between piezoelectric elements 11 and 12a, 12b, 12c b: piezoelectric elements 12a and 13a, 13a
and 14a, 12b and At intervals of 13b, 13b and 14b, 12c and 13c, and 13c and 14c, the radiated
sound waves are concentrated at the central axis 1 distance gIx. By the way, in the embodiment
of the present invention, since each of the concentric piezoelectric elements other than the
central portion is divided into three each, the central axis can be controlled by controlling the
delay time of each of the delay elements 21 to 30. It is possible to concentrate the radiated sound
wave not only on the top but also in the oblique direction. Although the piezoelectric elements
are arranged concentrically in the above embodiment, the piezoelectric elements need not
necessarily be concentric, and may be concentric annular. It is also possible to sweep the emitted
sound wave beam by electronically controlling each of the delay elements 21 to 30 using a CCD
or the like. In the case of using a CCD as a delay element, the delay time can be proportionally
changed by increasing or decreasing the clock frequency. Applying this method to the
embodiment of FIG. 1, it is possible to change the focus of the emitted sound wave by changing
the frequency of COD's clock. [Effects of the Invention] As described above, the present invention
arranges the plurality of piezoelectric elements in a concentric ring shape and excites each of the
piezoelectric elements with an electric signal having a time delay, so the time of the electric
signal is increased. By adjusting the delay, it is possible to focus the sound wave on any place in
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the space. Therefore, the present invention is expected to be widely used as a sound generator
for ultrasonic measurement, such as an obstacle detector using an ultrasonic wave, a distance
meter, and a snowfall height.
[0002]
Brief description of the drawings
[0003]
1 (a) and 1 (b) show an embodiment of the present invention, and FIG. 1 (a) is a front view of a
piezoelectric element and a connection circuit of its exciter, and FIG. 1 (b) is piezoelectric FIG. 2
is a front view of a piezoelectric element showing another embodiment of the present invention
and a connection circuit diagram of its exciter.
In the figure, 10 is a substrate, 11.12, 13 and 14 are piezoelectric elements, 20 is an exciter, 21,
22, 23 ° 24 is a delay element, and 15 is a signal source.
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