JPS6288413A - Manufacture of ultrasonic wave delay line - Google Patents

Abstract

PURPOSE:To adhere piezoelectric elements under a uniform pressure on the glass medium surface by an adhesives by pressing the piezoelectric element onto the glass medium via an elastic sheet by a retaining pressing plate having a recess. CONSTITUTION:In using the retaining pressing plate 1 having a recess to press the piezoelectric element 2 onto the glass medium 3 via the elastic sheet 7, a thermosetting resin 4 is applied in advance between the piezoelectric element 2 and the glass medium 3 and the sticked position is placed to a prescribed position. The width of the recess of the retaining pressing plate 1 is processed larger than the width of the piezoelectric element 2. When a pressing force 5 is delivered via a retaining shaft 6, the part of the elastic sheet 7 surrounded by the piezoelectric element 2 and the recess is compressed. In this case, the pressure of the surrounded part is made constant and the pressure pressed moreover is given from the recess via the elastic sheet 7, resulting that the element is pressed by a uniform pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of manufacturing an ultrasonic delay line using a piezoelectric element and a glass medium.

(Prior Art) Conventionally, a method for manufacturing this type of ultrasonic delay line has been carried out as shown in FIG. 3 and FIGS. 4(a) and 4(b), for example. In the figure, a piezoelectric element 1 is coated with a thermosetting resin 12 in advance on the bonding surface on a glass medium 11.
3 is set in a predetermined position, and the elastic sheet 14
is placed between it and the presser press plate 15. Presser press plate 1
The pressurizing surface of No. 5 is processed to have high flatness, and there are extremely few irregularities. In this state, presser shaft 16
When an external force is applied in the bonding direction through the elastic sheet 14, the elastic sheet 14 is deformed and assumes a shape as shown in FIG.

By heating while maintaining this state, the thermosetting resin is applied to the piezoelectric element 13 and the glass medium 1 under constant pressure.
It spreads thinly between the piezoelectric element 13 and the glass medium 11, and after a certain period of time, it hardens with that thickness, resulting in piezoelectric element 13 and glass medium 11.
are pasted together. 17 is a pressurizing force, 18 is a pressurizing area, and 19 is a contour line showing the shape of the piezoelectric element.

(Problems to be Solved by the Invention) According to the conventional method, the thickness of the thermosetting resin interposed between the piezoelectric element and the glass medium is determined by the magnitude of the pressing force. , at this time, the elastic sheet exerts a force near the end face of the piezoelectric element that tries to escape to the periphery of the piezoelectric element, and when compared with the pressing force near the center, the pressure per surface area at +lt is It will become smaller. That is, the film thickness of the thermosetting resin near the center of the piezoelectric element is small, and it becomes large near the periphery of the piezoelectric element, making it impossible to create a uniform laminate-like bang. Furthermore, if an attempt is made to obtain an overall uniform film thickness by increasing the pressure, there is a risk of damaging the piezoelectric element and the glass medium, and furthermore, there is a problem in the durability of the pressure jig.

An object of the present invention is to provide a method for manufacturing an ultrasonic delay line that eliminates the conventional drawbacks and makes the film thickness of the thermosetting resin uniform without damaging the piezoelectric element and the glass medium. be.

(Means for Solving the Problems) The method for manufacturing an ultrasonic delay line of the present invention includes an ultrasonic delay line using a piezoelectric element and a glass medium, in which both are bonded using an adhesive such as a thermosetting resin. In the manufacturing process of bonding and pressurizing, glass is bonded by interposing an elastic sheet between the piezoelectric element and the pressing plate-3, which has a surface formed with a concave portion that presses to wrap around the piezoelectric element. It is attached to the surface of the medium with uniform pressure.

(Example) An example of the present invention will be described based on FIG. 1, FIGS. 2(a) and (b), and FIG. 4(b).

FIG. 1 is a perspective view showing the method of manufacturing an ultrasonic delay line of the present invention, and FIG. 2(a) is a sectional view showing the same pressurized state. In FIG. 1, when a presser press plate 1 having a concave portion attempts to press a piezoelectric element 2 against a glass medium 3 via an elastic sheet 7, there is a thermosetting material between the piezoelectric element 2 and the glass medium 3. The resin 4 is applied in advance, and the bonding position is also positioned at a predetermined location. The width of the concave portion of the presser press plate 1 is processed to be larger than the width dimension of the piezoelectric element 2.

When the pressurizing force 5 is transmitted through the presser shaft 6, the portion of the elastic sheet 7 surrounded by the piezoelectric element 2 and the recess is compressed, as shown in FIG.

At this time, the width of the recess is determined by taking into consideration the width of the piezoelectric element 2 and the distortion dimension of the elastic sheet 7, so the pressure in the enclosed area remains constant, and the pressure applied to the enclosed area remains constant. It will protrude from the elastic seams 1 to 7. As a result, the piezoelectric element 2 is pressed down by the uniform pressure of the glass medium 3. Therefore, as shown in FIG. 2(b), it is possible to create a pressurizing area that approximates the shape of the piezoelectric element 2, and as shown in FIG. 4(b), there is no blank space near the end face of the piezoelectric element shape. It can be bonded uniformly under pressure. 8 is a pressurizing area, and 9 is a contour line showing the shape of the piezoelectric element.

(Effects of the Invention) According to the present invention, it is possible to stretch the bonding adhesive between the piezoelectric element and the glass medium using an ultrasonic delay line and make the film thickness constant, and the practical effect is great. It is.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a method of processing an ultrasonic delay line according to an embodiment of the present invention, FIG. 2(a) is a sectional view showing a pressurized state in the same embodiment, and FIG. FIG. 3 is a perspective view of the conventional ultrasonic delay line processing method, FIG. 4(a) is a cross-sectional view showing the same processing state, and FIG.
b) is a plan view showing the pressurized area. 1... Presser plate, 2... Piezoelectric element, 3...
Glass medium, 4... Thermosetting resin, 5... Pressing force, 6... Presser shaft, 7... Elastic sheet, 8... Pressure area, 9... Piezoelectric element shape Contour line shown. Patent applicant Matsushita Electric Industrial Co., Ltd. Figure 1 Figure 2 (a) (b) Figure 3 Figure 4 (a) (b)

Claims (1)

[Claims] In the manufacturing process of an ultrasonic delay line using a piezoelectric element and a glass medium, in which both are bonded and pressed together using an adhesive such as a thermosetting resin, a concave part is processed and formed to apply pressure so as to wrap around the piezoelectric element. A method for manufacturing an ultrasonic delay line, characterized in that a press plate having a surface and the piezoelectric element are bonded to the surface of the glass medium with uniform pressure by interposing an elastic sheet between the plate and the piezoelectric element.