JPS5869108A - Ultrasonic wave solid-state delay element for cascade connection section - Google Patents

Abstract

PURPOSE:To improve the temperature characteristics of delay time, without changing the material for a delay medium and an input/output converter, by selecting the material for a fixing agent, in installing the input/output converter to the side surface of the delay medium via the fixing agent. CONSTITUTION:An input converter 400 and an output converter 500 are installed on cut surfaces 304, 305 of a delay medium 300 via a fixing agent 600. In this case, as the fixing agent of the converters 400 and 500, different fixing agents 600 are used. That is, the fixing agent of negative characteristics where the amount of delay time change by an ultrasonic wave delay element is decreased according to temperature rise is used for the one converter and the fixing agent of positive characteristics where said delay time is increased is used for the fixing agent to the other converter. Thus, the temperature compensation of the delay time characteristics can be performed without the selection of types of materials for the medium 300, and converters 400 and 500.

Description

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

An example of this type of ultrasonic solid-state delay element is one in which two elements of ultrasonic solid-state delay elements are connected in cascade as shown in FIG. For example, a delay time of 2H is obtained by connecting two ultrasonic solid state delay elements DI and D2 in series, each having a function of delaying the signal by L H = 63.'') 56 μs).

The basic configuration of the ultrasonic solid retardators D1 and D2 is as follows: delay media 100 and 200, piezoelectric plate 101 and electrodes 102, 103 and 2tJ2 on ZO soil,
203 and electrodes 105, . 106 and Hi 205, 2
06, and a delay element D
I U) Connect a dancer 2 (resistance, width, coil, or ) are connected in series or in parallel, or the connection point and the ground side are open. Traditionally, strict requirements have been placed on the temperature characteristics of the delay time, and these requirements usually include temperature changes (0 to bo' c
) within ±5 ns of the predetermined delay time. In order to meet this demand, conventional approaches have been taken to examine the composition of the material for the delay medium, which is the main component of each ultrasonic solid state retarder, and to obtain one with good temperature characteristics. However, adopting the above method does not meet the above-mentioned requirements (±5
Since n s, ) is an absolute value unrelated to the delay time, even if the optimal material for the delay medium is selected for a 2H delay element formed by cascading two IH delay elements, the material is ( Construction/2) It cannot be used for ultrasonic solid delay elements with delay times due to cascading connection of earth H and retardation elements such as H and 24H, so new materials must be selected and different materials prepared for each. Must have. For this reason, the design and manufacturing aspects were extremely complicated, and furthermore, even if the above-mentioned method was used, there was a limit to improving the delay time-temperature characteristics by material selection alone.

The objects of the present invention are, firstly, to provide a cascaded ultrasonic solid-state retarder with improved delay time-temperature characteristics without changing the materials of the delay medium and the input/output transducer; and secondly, The object of the present invention is to provide a cascaded ultrasonic solid-state retarder that exhibits even better delay time-temperature characteristics by adding temperature compensation by a new means to the delay time-temperature compensation obtained by the conventionally obtained delay medium material. In order to achieve the above object, the present invention provides that when the same fixing material is used for all the ultrasonic solid retarders connected in cascade, the delay time of all the ultrasonic solid retarders decreases as the temperature increases. One of the negative characteristic fixing material exhibiting the characteristic that the amount of change decreases and the positive characteristic fixing material exhibiting the characteristic that the amount of change increases, and the other is connected to the input transducer of the ultrasonic solid state retarder. The cascade-connected ultrasonic solid state retarder is characterized in that the delay medium is interposed between the side surfaces of the delay medium and the output transducer is interposed between the side surfaces of the delay medium.

FIG. 1 is a diagram showing an embodiment of the present invention of one of the two ultrasonic solid-state retarders shown in FIG. 1 which are cascade-connected. As for the ultrasonic solid state retarder of the second element, only the material of the fixing material interposed between the input/output transducer and the side surface of the delay medium is different, as will be described later, so the drawing thereof will be omitted.

The delay medium 'j00 in this example is KZO-5ro-PbLl
-Sin.

The shape of the main plane is rectangular.
It is a pentagon with the corners cut out at an angle of 45°, and the left and right halves of the cutout surface in the longitudinal direction (separated at the center) and the adjacent sides @"Recently, gold was applied to a part of 303. , extraction electrodes 304 and 305 made of silver or the like are attached by vacuum evaporation.On both main surfaces of the delay medium 300,
An absorbing material 306 made of a material that attenuates ultrasonic waves, such as rubber, 1/2, or nail, is attached to areas other than the ultrasonic propagation path 307. In addition, a groove 308 having a U-shaped cross section is formed in the center of the cutout surface O1 described above, and this groove 308 (J8) separates the emission and arrival of ultrasonic waves from the input/output transducer. In addition to the effect of suppressing streaks I), when a suitable material is used as a bonding material, which will be described later, the bonding material can be It has the effect of preventing water from flowing into the water.

Next, the input transducer 400 consists of a piezoelectric ramic board 40 made of lead citric acid and ruconate, and a piezoelectric ramic board 40 made of lead ruconate.
The excitation electrodes 402 and 4Q3 are made of vacuum-deposited sheaths of gold, silver, etc. on the amphiphilic plane of the soil, and the output transducer 50
0 is similarly piezoelectric and consists of a lamic plate 5o1 and excitation electrodes 5ok and 5o3 attached to its biplanar surfaces.

The input/output transducer 400.500 is connected to the extraction electrode 304.105 on the cutout surface 301 of the delay medium 300 described above.
However, conventionally, this installation means includes two ultrasonic solid state delay elements connected in cascade, and an input/output converter 400.
．． The same fixing material (e.g. Evo + resin or low melting point solder) was used for 50Q, but in the present invention, for example, in one element 0) ultrasonic solid retarder (D L in FIG. Input/output converter 400,500 and delay medium 300
An alpha cyanoacrylate-based adhesive (trade name: Alloy Rufu Ryo) was used as the adhesive material e+oo to be interposed between the notch surface j0 and the soil, and the ultrasonic solid retarder of the other element (Fig. 1) In D2), as the fixing material 600, an evo+shi resin adhesive (trade name: Araldai r Unitsu r) is used. These adhesives have soft insulating properties, but since the thickness of the intervening film is about 10 μm or less, the excitation electrodes 4'03, 503 and delay medium 3oo on the lower surface of the input/output transducer 400 and 500 are cut out.
There is no practical problem in each electrical connection with i:jol extraction electrode: jQ4.30'). Regarding the action of the ultrasonic solid state delay element in this example, a predetermined electrical signal (frequency example: 4.43 MH2) is applied to the input transducer 4QO, where it is converted into a transverse ultrasonic wave, and the The ultrasonic wave is propagated along a predetermined propagation path 307 in the delay medium 300, reaches the output transducer 500, and is reconverted from the ultrasonic wave to an electric signal, and is converted into a predetermined signal according to the length of this propagation path: 507. A delayed signal with a delay time of (this example-IH) is obtained.

In this example, as described above, different adhesives are used as the fixing material 600 of the two-element ultrasonic solid-state retarder. Figure 3 shows the change in delay time of the two-element cascade-connected ultrasonic solid-state retarder with respect to temperature changes (0 to 606 C). It is a temperature characteristic diagram showing the amount. Curve (a) in the same figure is the temperature characteristic curve when both the input and output converters are 400 and 500 as well as the 21-element delay element, and the curve (b) is the temperature characteristic curve when the 21-element delay element and the input/output converter are both 400 and 500. This is a temperature characteristic curve when using the adhesive material (Araldide Rapid R). Note that the materials of the delay medium 'jo□ and the input/output converters 400 and 500 are the same.

The amount of change in delay time of the ultrasonic solid retarder with respect to temperature change (0 to 60°C) is that curve (a) increases by +8 as the temperature rises.
The curve (b) ranges from -4 ns to +8 ns, indicating a negative characteristic, and the curve (b) ranges from -4 ns to +8 ns, indicating a positive characteristic.

Therefore, in the two-element cascade-connected ultrasonic solid-state retarder as in the embodiment described above, the above-mentioned one glue (Aron Alpha) to the input/output converter of the ultrasonic solid-state retarder of the other element 400.500
By using the other adhesive described above (Araldaidra adhesive 1) between the bow retardation medium cutout surface 3, the delay time temperature characteristic of the ultrasonic solid retarder connected in cascade with the elements of this example is as shown by the curve ( C) +ns to -0 as shown in
, 4 ns of delay time variation.

Song # Considering that (a) and (b) are temperature compensation characteristics determined by material selection of the delay medium, which is a conventional method, 1
It can be seen that the curve (C) obtained according to the present invention allows temperature compensation to be made in the large flower compared to the conventional method.

Furthermore, according to the present invention, temperature compensation can be performed by selecting a fixing material without selecting the material of the delay medium as in the past. This makes it possible to standardize each material of the input/output converter, and eliminates complexity in design and manufacturing. Such advantages can be obtained not only in the two-element cascade connection of this example, but also in a multi-element cascade-connection ultrasonic solid state retarder having three or more elements. Note that the input and output transducers of the ultrasonic solid-state delay element can generally be replaced with each other, and the fixing material can also be replaced independently without being dependent on the input and output transducers. An example of the use of adhesives is to use one adhesive between the input transducer and the cutout surface of the delay medium, and between the output transducer and the cutout surface of the delay medium of the same element. ') and the other adhesive (Araltitra to r) may be used. These adhesives may be used on any of the input/output transducers. This usage example is convenient when the number of elements is an odd number such as 3.5.

In the above embodiments, a pentagonal delay medium is used, but the present invention can also be applied to other multi-reflection type delay media as well as
It may be of a linear type, and the materials of each part are not limited to those of the examples.

[Brief explanation of drawings]

FIG. 1 is a connection diagram of a conventional two-element cascade-connected ultrasonic solid-state retarder, and FIG. 2 is a diagram showing one element of the two-element cascade-connected ultrasonic solid-state retarder, which is an embodiment of the present invention. The plan view and FIG. 3 are characteristic diagrams showing the amount of dark change during delay with respect to temperature changes of the ultrasonic solid state retarder. 3QO...delay medium, 400...input converter, 50
010. Output converter, bOO...Fixed batting procedure
Amendment (spontaneous) 2. Name of the invention: Cascaded ultrasonic solid-state delay element 3. Relationship with the person making the amendment Patent applicant address: 1-8-1 Izumihonmachi, Komae-shi, Tokyo Postal code: 301 Telephone number: 03) 489-23114, the drawing to be corrected, Figure 1, Figure 5, and the content of the correction, Figure 1, will be corrected as shown in the attached sheet.

Claims (1)

[Claims] (1) The input converter and output converter are connected to slow IA medium QJi.
:+:1 Installed in H via a fixing material, the ultrasonic wave generated from the input transducer propagates along a predetermined propagation path in the delay medium and reaches the output transducer. When at least two solid-state retarders are connected in cascade and the same fixing material is used for all the cascade-connected ultrasonic solid-state retarders, the delay time change due to all the ultrasonic solid-state retarders as the temperature rises. The input transducer of the ultrasonic solid retardator and the delay are connected to one of a negative characteristic fixing material exhibiting a characteristic of decreasing quantity and a positive characteristic fixing material exhibiting a characteristic of increasing quantity. A cascaded ultrasonic solid state retarder interposed between sides of a medium and between the output transducer and a side of the retardation medium.