JPS63190415A - Ultrasonic wave delay line - Google Patents

Abstract

PURPOSE:To obtain two kinds or over of delay times by providing a notch part having an angle to a reflecting face of a main signal of a ultrasonic wave delay medium to split the propagation direction of the ultrasonic wave into two or over and fitting plural output transducers to the split signal. CONSTITUTION:The ultrasonic wave main signal coming from an input transducer 1 fitted to one end face of a ultrasonic wave delay medium 4 is split by notches 5, 6 having an angle 7 provided to at least one reflecting face, the split signal is outputted by different output transducers 2, 3 to obtain a different delay time. The notch parts 5, 6 are provided to one position of the ultrasonic wave delay medium 4 and two kinds or over of delay times are obtained.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention relates to an ultrasonic delay line, in which one Mif per 4□
r, relates to an ultrasonic delay line that can extract multiple delay times using a wave delay medium.

[Prior Art] In a conventional ultrasonic delay line, all input main signal components from the same input transducer proceed in the same direction and propagate to one output transducer. Normally, one type of delay time was obtained from a pair of transducers for human blades. Figure 6 shows a diagram of the most conventional example. On one end face of the Mi acoustic wave delay medium 1, an output transducer 3 is provided on the other end face opposite to the input transducer 2. The ultrasonic main signal input from the input transducer 2 is transmitted to the output transducer after a predetermined delay time has elapsed.
3 into an electrical signal. The Jfi'i:f
The surface of the wave delay body 1 is coated with an absorbent material 4 for absorbing unnecessary signals.

Furthermore, in order to obtain two or more types of delay times from one ttfl sound wave delay medium, input and output transducers are required for each type of delay time. FIG. 7 shows a diagram of a conventional example. Super? One end face of the wave delay medium 9 is provided with a 1-input transducer II 7 and an output transducer 6, and the other end face facing the human power transducer II 7 is provided with: An output transducer 8 is provided. The main ultrasonic wave output from the input transducer 5 is the reflection surface 10.1.
1 and outputted from the output transducer I6 after a predetermined delay time d has elapsed.

- The ultrasonic main signal output from the input transducer 7 goes straight through the MiR wave delay body 9 and is output by the output transducer II 8.

Therefore, the delay time due to the human quadrature transducer I5 and the output transducer E6 is different from the delay time due to the input quadrature transducer II 7 and the output transducer 〇8.

[Problems to be Solved by the Invention] Since the conventional ultrasonic delay line has the above-mentioned configuration, in order to obtain two or more types of delay times with one ultra-1° single-wave delay medium, required a pair of input and output transducers for each of the multiple delay times.

[Means for Solving the Problems] The present invention has been made to solve the above-mentioned problems, and includes a cutout having a certain angle on at least one reflecting surface of the main signal of the 8-wave delay medium. A section is provided to divide the propagation force direction of the ultrasound into two or more, and a plurality of output transducers are attached to the plurality of ultrasound main signals,
The present invention provides an ultrasonic delay line that extracts two or more types of delay times.

[Function] In the present invention, an ultrasonic main signal output from one input transducer attached to one end face of one art wave delay medium is transmitted to at least one reflecting surface of the ultrasonic main signal. The divided signals are divided by the provided notch portions having a certain angle, and the divided signals are outputted by different output transducers to obtain different delay times. Therefore, by providing the notch at one or more locations on the ultrasonic delay medium, one ultrasonic signal can be divided into two or more signals, and two or more types of delay times can be obtained.

[Example] Examples of the present invention are shown in FIGS. 1 to 5. FIG. 1 is a plan view showing a device that reflects one ultrasonic main signal into two main signals. On one end surface of the ultrasonic delay medium 4,
An input transducer 1 is attached, and the ultrasonic main signal output from the input transducer 1 is split into two and reflected at the cutout surfaces 5 and 6, and each is sent to the output transducer. I2. Output at I3. In this case, it is appropriate that the notch width 7' be equal to or longer than the main signal path width; Although the angle 7 of the ilJ notch surface and the lengths 5 and 6 of the notch surfaces can be arbitrarily selected, in this example, the angle 7 of the notch surface is 90 degrees. Second
The figure shows a plan view when the angle and length of the notch surface are changed. An input transducer 9 is attached to one end surface of the ultrasonic delay medium 8. The main ultrasonic signal output from the transducer 9 is divided and reflected by the cutout surfaces 16 and 17, and is transmitted to the output transducers 10 and 11 attached to the opposing side end surfaces of the ultrasonic delay medium 8, respectively. is output. The lengths of the cutout surfaces 1B and 17 are equal. In this case, when the angle 18 of the cutout surfaces is changed, the length of the cutout surfaces 18.17 also changes, and the direction of reflection of the ultrasound main signal also changes. The angle 18 of the cutout surface is 90', but if the angle is larger than that, for example, if the angle 18 of the cutout surface is used,
The reflection direction of the ultrasonic main signal is input transducer 9.
Since the output transducer I'12.
As shown in II'13, an output transducer is attached at a position corresponding to the direction of reflection of the ultrasonic main signal.

In addition, if the angle of the notch surface is smaller than 90°, for example, if the angle of the notch surface is 20 degrees, the reflection direction of the ultra-high frequency main signal will shift to the opposite side of the input transducer 9, so the output Tora,/Sducer II” 14
．． As shown in II 15, an output transducer is attached at a position corresponding to the direction of reflection of the tfI sonic main signal.

FIG. 3 shows a plan view when the lengths of the cutout surfaces are different. The ultrasonic main signal output from the input transducer 22 attached to one end face of the ultrasonic delay medium 21 is divided and reflected by the cutout surface 25.2G, and the ultrasonic delay medium 2
The output is output from output transformers attached to the opposite side end surfaces of 1. Since the length of the notch 26 is longer than the length of the notch surface 25, if the reflection angles of the two reflected waves are equal, naturally the length of the output transducer 1124 is longer than the length of the output transducer 1124. It is longer than the length of I23. Furthermore, if the propagation distances of the two reflected waves are equal, the delay times will be equal, and two signals with different output levels can be obtained with the same delay time. In this example, the angle of the cutout surface is 90°, but the angle does not have to be 80°.

FIG. 4 shows a plan view when a plurality of notches are provided. An input transducer 28 is attached to one end face of the ultrasonic delay medium 27, and the ultrasonic main signal output from the input transducer 28 is divided by cutout surfaces 32 and 33. The ultrasonic main signal reflected by the notch surface 32 is transmitted to the output transducer-I2.
9 is output. The ultrasonic main signal reflected by the notch surface 33 is reflected by the notch surface 34, and further reflected by the notch surface 34.
8. Transducer for output after being split and reflected at 37
1130, I [Output at I31. In this example, the cutout surface 35 does not serve as a reflection surface for the ultrasound main signal.
By providing three cutouts of different sizes in one ultrasonic delay medium 27, three signals with different delay times can be obtained. Therefore, by providing more cutout surfaces, it is possible to obtain more signals with different delay times.

Figure 5 shows the surface of the ultrasonic delay medium excluding the notch.
An input transducer 38 is attached to one end surface of the ultrasonic delay medium 44, which shows a plan view when a sound absorbing material is applied to a portion other than the main signal path. The ultrasonic main signal outputted from the cutout surface 41 and 42 is divided and reflected, and the ultrasonic main signal reflected by the cutout surface 41 is outputted by the output transducer I39. The ultrasonic main signal reflected by the notch surface 42 is reflected by the notch surface 43 and outputted by the output transducer [40]. A sweat absorbing material 45 is applied to a part of the surface of the ultrasonic delay medium 44 excluding the cutout surface and the surface other than the main signal path. The sweat absorbent material 45
is applied along the main signal path, but the application position and area can also be adjusted as appropriate to adjust insertion loss and attenuation of unnecessary signals.

In the embodiment shown in FIGS. 1 to 5 above, the shape of the notch in the plan view is a triangle when its vertices are connected, but if the shape of the notch is made into a quadrangle such as a trapezoid, the reflected waves will be reflected in three directions. It can be divided, and if it is made into a pentagon, it can be divided into four force directions.

Therefore, it is also possible to perform split reflection in two or more directions with one notch.

[Effects of the Invention] The present invention provides a cutout portion with a certain angle in at least one reflection surface of the main signal of one ultrasonic delay medium to divide the propagation direction of the ultrasonic wave into two or more. It has the excellent effect of attaching a plurality of output transducers to a plurality of divided ultrasonic main signals and extracting two or more types of delay times. In addition, by changing the angle of the cutout, the direction of reflection of the reflected wave can be freely controlled, and the position of the cutout surface can be shifted in a direction other than the propagation direction of the incident main signal. It also has the effect that by changing the length of the notch surface, the division ratio of the main signal can be changed and the output level can be adjusted. Furthermore, by applying sound absorbing material to areas other than the main signal path on the surface of the ultrasonic delay medium excluding the cutout, and changing the application position and area of the sound absorbing material, it is possible to attenuate or insert unnecessary signals. You can also adjust your losses. Also, in order to obtain multiple delay times, instead of using multiple pairs of input and output transducers, it is sufficient to use multiple output transducers for - input quadrature transducers, which reduces costs. It also has the effect that the installation of the input transducer can be reduced by at least 1 or less.

[Brief explanation of the drawing]

1 to 5 are diagrams showing embodiments of the present invention, and FIG. 1 shows that the angle of the cutout surface is 9 at the end of the t1i acoustic wave delay medium.
A plan view of an ultrasonic delay line with one notch at 0', Figure 2 is a plan view when the angle of the notch is changed, and Figure 3 is a plan view with different lengths of the notch. FIG. 4 is a plan view of the case where three notches of different sizes are provided, FIG. 5 is a plan view of the case where suction 7F material is applied, and FIGS. 6 and 7 are FIG. 2 is a plan view showing a conventional example. 1... Input transducer 2... Output transducer 1 3... Output transducer ■ 4... Ultrasonic delay medium 5.6... Notch surface 7 ... Angle of notch surface 45 ... Sound absorbing material 1st time 3rd surface Goo surface LF Figure J 5 times

Claims (2)

[Claims] (1) At least one reflecting surface of the main signal of the ultrasonic delay medium is provided with a notch portion with a certain angle to divide the propagation direction of the ultrasonic wave into two or more, and the plurality of ultrasonic main signals are Attach multiple output transducers to
An ultrasonic delay line that extracts two or more types of delay times. (2) The ultrasonic delay line according to claim 1, wherein a sound absorbing material is applied to a portion of the surface of the ultrasonic delay medium other than the main signal path, excluding the cutout portion.