JPH0141228Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention aims to obtain an ultrasonic delay line that can obtain about twice the amount of delay with a delay medium of the same size as a conventional one, and can be significantly miniaturized. The purpose is to

Prior Art Figure 2 shows a conventional ultrasonic delay line, in which 1 is a glass delay medium with one corner cut out at 45° to form a slope 1a, 2 is a piezoelectric transducer for input,
3 is a piezoelectric transducer for output, 4 is a bisector of the slope 1a, and the piezoelectric transducers 2 and 3 for input and output are equidistant from the bisector 4 of the slope 1a. It is pasted in the position of . In the above configuration, when an input signal is applied to the input piezoelectric transducer 2, the electrical signal is converted into an ultrasonic wave, which reaches the output piezoelectric transducer 3 through the solid line path shown by 5, and reaches a predetermined level. It is extracted as a time-delayed electrical signal.

Problems to be Solved by the Invention However, such an ultrasonic delay line has a problem in that there is a limit to its miniaturization due to the configuration of its reflection path 5.

The present invention aims to eliminate such conventional drawbacks and provide an ultrasonic delay line with a structure suitable for miniaturization.

Means for Solving the Problem In order to solve this problem, the ultrasonic delay line of the present invention consists of a flat delay medium with a rectangular cross section.
When a rectangular piezoelectric transducer is attached to the slope by cutting out a corner at 45 degrees and attaching a rectangular piezoelectric transducer to the slope, two piezoelectric transducers are placed only on one of the two sides dividing the slope into two. The structure is such that the long sides thereof are arranged in a straight line in the longitudinal direction of the slope.

Effects According to this configuration, the path from the electrical signal applied to the input piezoelectric transducer being converted into an ultrasonic wave until it reaches the output piezoelectric transducer has a glass delay of the same size as the conventional one. This means that approximately twice the amount of delay can be obtained with the medium, and if you want to obtain the same amount of delay as before, you will only need a glass delay medium that is approximately half the size.In any case, the ultrasonic delay line This makes it possible to significantly reduce the size of the device.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to FIG. 1, with the same numbers assigned to the same parts as in the conventional example.

As one embodiment of the present invention is shown in FIG. Both piezoelectric transducers 2 and 3 are attached. That is, on one of the two surfaces divided by the bisector 4 of the slope 1a,
Rectangular input and output piezoelectric transducers 2 and 3
are attached so that their long sides are aligned in a straight line in the longitudinal direction of the slope 1a. Of course, the effect is the same even if you paste it on the other side.

If the slope 1a is divided into two halves in this way and the piezoelectric transducers 2 and 3 for input/output are attached to only one side so as to be lined up in a straight line in the longitudinal direction of the slope 1a, the input piezoelectric After the electrical signal applied to the transducer 2 is converted into an ultrasonic wave, the solid line 6 in FIG.
It reaches the piezoelectric transducer 3 for output through the path shown by. This path 6 is approximately twice as long as the path 5 in FIG. Therefore, according to the present invention, a glass retardation medium of the same size as the conventional one has approximately 2
Double the amount of delay can be obtained, and in order to obtain the same amount of delay as before, it can be obtained with a glass delay medium that is approximately half the size of the conventional one, and as a result, the shape of the ultrasonic delay line can be significantly miniaturized. I can do it.

Effects of the Invention As described above, according to the present invention, the structure is extremely simple, and a glass delay medium of the same size as the conventional one can be used to
If you want to obtain twice the amount of delay and the same amount of delay as before, you will need a delay medium that is approximately half the size of the conventional one, making it possible to obtain an ultrasonic delay line whose shape can be significantly reduced. can.

[Brief explanation of drawings]

FIG. 1 is a side view showing an embodiment of an ultrasonic delay line according to the present invention, and FIG. 2 is a side view showing a conventional ultrasonic delay line. 1...Glass delay medium, 1a...Slope, 2...
Piezoelectric transducer for input, 3... piezoelectric transducer for output, 4... bisector, 6... signal path.

Claims (1)

[Scope of utility model registration request] One corner of a flat delay medium with a rectangular cross section
When installing a rectangular piezoelectric transducer on the slope by cutting it out at 45 degrees,
An ultrasonic delay line characterized in that two piezoelectric transducers are attached to only one of two equally divided surfaces such that their long sides are aligned in a straight line in the longitudinal direction of the slope.