JP2539425B2 - Method for manufacturing ultrasonic solid-state delay line - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a method of manufacturing an ultrasonic solid-state delay line, and particularly to an ultrasonic solid-state delay line which is easy to manufacture, has good characteristics, and is suitable for a high-resolution video device. The manufacturing method of

[Technical Background of the Invention] Conventionally, as shown in FIG. 4, an input transducer 21 and an output transducer 22 are bonded onto a glass block 20 which has been previously processed into a predetermined polygonal shape and dimensions. Then
Then, a manufacturing method is known in which a large amount of ultrasonic solid delay lines are obtained at low cost by thinly cutting the surface 23 with a slicing machine or the like (USP 3,581,247). In order to use this ultrasonic solid delay line DL for high-resolution video equipment such as ITV, put both sliced glass main surfaces 24, 25 between lapping machines 26, 27 as shown in FIG. A very small amount was cut off with the abrasive grains used as the material, and the surface was finished within the dimensional tolerance with extremely high precision.

[Problems of background art] In lapping of both glass main surfaces of such an ultrasonic solid delay line, processing defects such as notches 28 and chamfers 29 around the glass main surface were likely to occur (No. (Fig. 6). The defects during lapping mainly occur around the glass main surface, and scratches on the entire glass main surface are relatively small. The peripheral edges of both glass main surfaces of the ultrasonic solid-state delay line are the reflection surface 30 and the electrode surface / input / output transducer portion 31, and are important portions in terms of their characteristics. That is, this notch
When 28 occurs, increase in insertion loss, increase in unwanted reflection (spurious) 32, etc. become apparent (Fig. 7 (a)), and when surface sag 29 occurs, impedance at input / output transducer boundary. Due to the mismatch, the dispersion hump 33 occurs and the characteristic is significantly deteriorated (FIG. 7 (b)).

[Object of the Invention] The present invention has been made in view of the above conventional problems, and an object thereof is to provide a method of manufacturing an ultrasonic solid delay line which is easy to manufacture, has good characteristics, and is suitable for a high-resolution video device. is there.

[Summary of the Related Art] In order to achieve such an object, a method of manufacturing an ultrasonic solid delay line according to the present invention comprises a main surface of an ultrasonic solid delay medium, and a polygonal multiple reflection surface orthogonal to the main surface. And arranging an input transducer and an output transducer on the reflection surface and attaching an auxiliary material to the reflection surface to lap both surfaces of the main surface.

Embodiments of the Invention Preferred embodiments of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, the method for manufacturing an ultrasonic solid delay line of the present invention is such that an ultrasonic solid delay medium 1 such as glass has a main surface 2 and 3 and is orthogonal to the main surfaces 2 and 3. Pentagonal multiple reflection surfaces 4, 5, 6, 7, 8 are formed, and an input transducer 9 and an output transducer 10 are arranged on the reflection surface 4. Auxiliary material on the reflecting surfaces 4, 5, 6, 7, and 8
11, 12, 13, 14, and 15 are attached by a pine resin adhesive (wax), and rough lapping is performed on both main surfaces 2 and 3, and then mirror lapping is performed. However, the auxiliary material 11 is attached to the reflecting surface 4 via the input transducer 9 and the output transducer 10. As a material of the auxiliary material, a material having hardness equivalent to that of the material of the ultrasonic solid delay line (for example, glass) is preferable. The thickness of the auxiliary material is preferably 1 to 15 mm. If the thickness is less than 1 mm and the thickness is less than 1 mm, it is not possible to expect a reliable surface weaving prevention effect, and if it is greater than 15 mm, the lapping work becomes inefficient and meaningless.

As shown in FIG. 5, this lapping is performed by placing both sliced glass main surfaces 24 (2) and 25 (3) between lapping machines 26 and 27 and polishing them with an abrasive grain to produce a very small amount. Achieved by scraping and finishing the surface to within very precise dimensional tolerances.

When the lapping process is completed, the auxiliary materials 11, 12, 13, 14, 15
Are removed by heating.

In the actual manufacturing, as shown in FIG. 4, an input transducer 21 (9) and an output transducer 22 (9) are placed on a glass block 20 which is preliminarily processed into a predetermined polygonal shape and dimensions. 10) is glued and its reflective surfaces 4, 5,
Attach auxiliary materials 11, 12, 13, 14, 15 on 6, 7, 8 (Fig. 1) with a pine resin adhesive (wax), and after that,
It is preferable to obtain a large amount of ultrasonic solid delay lines at a low cost by thinly cutting the cutting surface 23 with a slicing machine or the like. In this case, the auxiliary material 14 is temporarily fixed to a support (not shown) with an adhesive (wax), thinly cut with a slicing machine, and the support is heated and removed from the auxiliary material 14 during lapping. Therefore, it is preferable to make the auxiliary material 14 thicker than other auxiliary materials.

According to such a method of manufacturing an ultrasonic solid delay line, the peripheral end portions of both glass main surfaces 2, 3 of the ultrasonic solid delay line have auxiliary materials 9, 10, 11, 12, 13 attached thereto. As a result, notches 28 and chamfers 29 are generated (Fig. 2), but since these auxiliary materials 9, 10, 11, 12, 13 are removed by heating after lapping, the reflecting surfaces 4, 5, 6, No cuts or 29 occur in 7 and 8 and input / output transducers 9 and 10, so there is no insertion loss or unwanted reflection (spurious).
Does not increase (Fig. 3 (a)), and due to impedance mismatch at the input / output transducer boundary, dispersion hump does not occur and the characteristics do not deteriorate significantly (Fig. 3 (b)). ), The result is favorable due to its characteristics, and it is suitable for high-resolution video equipment.

By adding the auxiliary material and performing the lapping in this way, processing defects during lapping were reduced. In particular, in lapping such as mirror finishing, chamfering has been unavoidable until now, but it has completely disappeared. Since these processing defects had a great influence on the characteristics of the ultrasonic solid delay line, the yield of the ultrasonic solid delay line manufacturing process was significantly improved.

In addition, in the method of manufacturing such an ultrasonic solid delay line,
Since it is only necessary to add an auxiliary material and perform lapping, manufacturing is easy.

Although the multiple reflection surface is a pentagon in the above embodiments, it can be formed in a polygon other than a pentagon. Further, in the above embodiment, the input transducer 9 and the output transducer 10 are provided on the same reflecting surface 4,
It can also be provided on different reflecting surfaces.

[Effects of the Invention] As is clear from the above embodiments, according to the method for manufacturing an ultrasonic solid delay line of the present invention, the ultrasonic solid delay medium has a main surface and a polygonal multiplex orthogonal to the main surface. A reflecting surface is formed, an input transducer and an output transducer are arranged on the reflecting surface, and an auxiliary material is attached to the reflecting surface to lap both surfaces of the main surface, thereby facilitating manufacturing. Thus, an ultrasonic solid delay line having good characteristics and suitable for high resolution video equipment can be obtained.

[Brief description of drawings]

FIG. 1 is a plan view of an ultrasonic solid-state delay line before lapping by the manufacturing method of the present invention, FIG. 2 is a side view of the delay line after lapping, and FIGS. 3 (a) and 3 (b) are respectively FIG. 4 is a diagram showing a frequency characteristic of the delay line and a time response of a burst signal. FIG. 4 is a perspective view showing a manufacturing process of a conventional delay line.
FIG. 5 is an explanatory view of conventional delay line lapping, FIG. 6 is a side view of the conventional delay line after lapping, and FIGS. 7 (a) and 7 (b) are frequency characteristics of the conventional delay line, respectively. ,
It is a figure which shows the time response of a burst signal. 1 ... Ultrasonic solid delay medium 2, 3 ... Main surface 4, 5, 6, 7, 8 ... Multiple reflection surface 8 ... Longitudinal wave 9 ... Transverse wave 9 ... Input transformer 10 ... Output transformer Users 11, 12, 13, 14, 15 ... Auxiliary material

Claims (1)

(57) [Claims] 1. An ultrasonic solid delay medium is provided with a main surface and a polygonal multiple reflection surface orthogonal to the main surface, and an input transducer and an output transducer are arranged on the reflection surface. A method of manufacturing an ultrasonic solid-state delay line, characterized in that an auxiliary material is attached to the reflecting surface and both surfaces of the main surface are lapped.