JPS5842308A - Ultrasonic wave solid-state delay element - Google Patents

Abstract

PURPOSE:To improve the temperature characteristics for delay time, by using a fixing member with negative/positive characteristics changed with the delay time between an input and output coverter and a delay medium. CONSTITUTION:An adhesive 400 consisting essentially of alphacyanoacrylate monomer is used as a fixing member between an input converter 200 and a notched surface 101 of a delay medium 100, and an adhesive 500 consisting of epoxy resin is used as a fixing member between an output converter 300 and the notched surface 101. The amount of change in delay time of the delay element shows the negative characteristics with the adhesives 400 as temperature rises and shows the positive characteristics with the adhesive 500, allowing to perform temperature compensation.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasonic solid state retarder with improved temperature characteristics of delay time.

This ultrasonic solid state delay element has a predetermined delay time (for example, l H = 63.556 Ps) for a predetermined electrical signal.
±5ns) is a 0 absolute value that is unrelated to the delay time, so even if the optimum delay medium and materials for the input/output transducer are selected for the ultrasonic solid-state retarder of the IH delay time, The material used was an ultrasonic solid state retardator with a delay time of (1/2) H12H, which had reached its limit.

The purpose of the present invention is, firstly, to provide an ultrasonic solid state delay element with improved delay time-temperature characteristics without changing the materials of the delay medium and human power transducer; To provide an ultrasonic solid-state retarder that exhibits good delay time-temperature characteristics by adding temperature compensation by a new means to the temperature compensation obtained by combining the delay time-temperature characteristics of the obtained delay medium and human output transducer. That's true.

In order to achieve such an object, the present invention has an object that when the same fixing material is used as the fixing material interposed between the input/output transducer and the delay medium, the amount of change in delay time changes as the temperature rises. An ultrasonic solid retardator characterized in that one of a negative characteristic fixing material exhibiting a decreasing characteristic and a positive characteristic fixing material exhibiting an increasing characteristic is used, respectively. FIG. 1 is a plan view illustrating an ultrasonic solid state delay element for IH delay time in which the present invention is implemented. The delay medium 100 in this example is KLO
-L Made of SrO-PbO-5in2 glass material, its main plane is a pentagon with one corner of a rectangle cut out at an angle of 456. Extracting electrodes 104 and 105 made of gold, silver, etc. are attached to a portion of each adjacent side surface 102 and 103 by vacuum evaporation. The delay medium 100 is attached to areas other than the ultrasonic propagation path kfMy. In addition, a groove ridge with a U-shaped cross section is formed in the center of the notch surface 101 described above, and the groove ridge is designed to separate the emission and arrival of ultrasonic waves from the human output transducer. In addition to the effect of suppressing the signal, it also has the effect of preventing an adhesive material, which will be described later, from flowing from one transducer to the installation surface (extracting electrodes 104, 105) of the other transducer.

Next, the human power transducer 200 consists of a piezoelectric t-ramic board 201 made of lead titanate sylcosinate, and a piezoelectric t-ramic board 2
Excitation type & 202.203 and output converter 3 are made by vacuum-depositing gold, silver, etc. on the painter's plane of 01.
00 similarly consists of a piezoelectric T-ramic plate 301 and excitation electrodes 302 and 303 attached to its painting plane.

The human output transducer 200.300 is connected to the extraction electrode 104.105 on the cutout surface 101 of the delay medium 100 described above.
Conventionally, the same fixing material (e.g., ebo resin or low melting point solder) was used for both the human-powered transducer 200 and 300 as an installation means, but in the present invention, for example, the human-powered transducer 200 and the notch of the delay medium 100.
As a bonding material between the surface 101 and the adhesive 400 (product name 7
0 serial), the output converter 300 and the delay medium 100
An epoxy resin adhesive (trade name: Araldai R5jitsur) is used as a fixing material between the notch surface 101 of the
0 is used for each. This adhesive 400, 50
0 is insulating in this example, but the thickness of the intervening film is approximately 10
Since Pm is less than f, the human output converter is 200.30
Excitation electrodes 203 and 303 on one side of 0 and delay medium 100
There is no practical problem in the electrical connections between the notch surface 101 and the extraction electrodes 104 and 105. In order to use the ultrasonic solid-state retarder 1 of this example, apply a predetermined electrical frequency (frequency example: 4.43 MHz) to the human-powered transducer 200, and then reach the transverse frequency of 300 MHz. The ultrasound waves are then reconverted into electrical signals.1
5+7 Then, the IH delay signal is obtained depending on the length of this propagation path.

In this example, the adhesive materials 400 and 50 are used as described above.
The reason for using 0 is explained in Fig. 2. Fig. 2 is a temperature characteristic diagram showing the amount of change in delay time of the ultrasonic solid state retarder with respect to temperature change (0 to 60" C). curve(
A) is a temperature characteristic curve when the above-mentioned adhesive 400'4E is used as a fixing material for both the human output transducers 200 and 300 and the delay medium cutout surface 101, and the curve (b) ) is also similar to the adhesive 500 described above.
The temperature characteristics are ° when using. In addition, delay medium 1
00 and the human output transducers 200 and 300 are made of the same material.

The amount of change in delay time of the ultrasonic solid state retarder with respect to temperature change (0 to 60' C) shows that curve (a) changes from 14.9 ns to 5.8 ns as the temperature rises, exhibiting negative characteristics. I(b) is −1.4 nS to +5.5 nS, indicating positive characteristics.

Therefore, as in the embodiment described above, the above-described adhesive 400 is applied between the manual transducer 200 and the delay medium notch surface 101, and the above-described adhesive 500 is applied between the output transducer 300 and the delay medium notch surface 101. As shown by curve t'i (C), the delay time temperature characteristic of the delay element of this example is temperature-compensated up to a delay time change amount of +1.13 ns to -0.6 ns.

Considering that the curves flCa) and (b) have characteristics that are temperature-compensated by the conventional method of combining a delay medium and eight output transducers, the curve (C
) shows that the temperature compensation 1 is significantly greater than that of the conventional method.

Furthermore, according to the present invention, since a fixing material is newly added to the selection of materials for the delay medium and the human power transducer as a temperature compensation means, the fixing material can be added without necessarily performing the conventional selection of each material. The temperature of the delay time can be compensated by selecting the material. This makes it possible to standardize the materials of the slow pairing medium and the human output transducer for various delay patented ultrasonic solid state retardators, which eliminates the complexity of design and manufacturing, which is of great practical importance. It is worth becoming.

Furthermore, since the input and output transducers of the ultrasonic solid state delay element can be replaced with each other, the fixing materials can also be replaced with each other independently without being dependent on the human output transducer.

In the above embodiments, a pentagonal delay medium is used, but the present invention is not limited to this, and it may be a linear type as well as other multi-reflection types, and the materials of each part may also be changed depending on the material. It is not limited to the examples.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an ultrasonic solid-state retarder according to an embodiment of the present invention, and FIG. 2 is a characteristic diagram showing the amount of change in delay time of the ultrasonic solid-state retarder with respect to temperature change. 100---Slow@medium, 200...-Human power converter, 30
0... Output converter, 400... Negative characteristic fixing material, 50
0...Positive property fixing material 1st force

Claims (1)

[Claims] (1) An input transducer and an output transducer are installed on the side of a delay medium, and the ultrasonic wave emitted from the manual transducer propagates along a predetermined propagation path within the delay medium and reaches the output transducer. In the ultrasonic solid retarder made of In some cases, one of the negative property fixing materials exhibiting the characteristic that the amount of change in delay time decreases as the temperature rises, and the positive characteristic fixing material exhibiting the characteristic that the amount of change in delay time increases as the temperature rises. Features: Ultrasonic solid state retarder.