JPH0353940B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for manufacturing an ultrasonic probe for an ultrasonic Doppler device or the like that measures the flow velocity of blood in a blood vessel using the ultrasonic Doppler method.

Structure of conventional example and its problems The ultrasonic probe of the ultrasonic Doppler device has an inner cylindrical transducer part 1 as shown in Fig. 1.
and an outer cylindrical transducer section 2. The inner cylindrical transducer part 1 has lead wires 6 connected to the upper electrode 4 and lower electrode 5 of the piezoelectric vibrator 3.
Connect. Next, an acoustic matching layer 7 made of multiple layers of synthetic resin or glass is adhered to the upper surface of the upper electrode 4, and a back load material 8 made of rubber or the like is adhered to the lower surface of the lower electrode 5. This cylindrical transducer section 1 is formed to have an outer diameter of about 6 mm, and mainly performs transmission. On the other hand, the outer cylindrical transducer section 2 connects lead wires 12 to the upper surface electrode 10 and the lower surface electrode 11 of the piezoelectric vibrator 9. Next, an acoustic matching layer 13 is bonded to the top surface of the top electrode 10, and a back load material 14 is bonded to the bottom surface of the bottom electrode 11.
This cylindrical transducer section 2 mainly performs reception. Thus, the cylindrical transducer section 1 is housed inside the cylindrical transducer section 2. After that, the gap between the cylindrical transducer part 1 and the cylindrical transducer part 2 is filled with a rubber adhesive 15.

In the conventional manufacturing method as described above, the gap between the cylindrical transducer part 1 and the cylindrical transducer part 2 was adjusted by the mesh interval.
It was difficult to uniformly adjust and maintain the gap to about 0.5 mm. Therefore, the electrical characteristics of the ultrasonic Doppler probe deteriorate, that is, the crosstalk varies, and the crosstalk increases due to the width of the gap.

Purpose of the Invention In view of the above-mentioned drawbacks, the present invention makes it possible to easily maintain a uniform interval between the cylindrical transducer parts, reduce crosstalk variations, and reduce the crosstalk value. decrease, etc.
It is an object of the present invention to provide a method for manufacturing an ultrasonic probe that can improve electrical characteristics and can be manufactured easily.

Composition of the Invention In order to achieve the above object, the present invention forms a cylindrical transducer portion having a piezoelectric vibrator as a positioning member, inserts the piezoelectric vibrator inside an annular projection having a uniform thickness, and The cylindrical transducer part having the cylindrical shape is fitted on the outside of the upper annular projection, and the gap between the positioned cylindrical transducer part and the cylindrical transducer part is filled with adhesive to form the cylindrical transducer part. It is characterized by maintaining uniform intervals between the outer peripheries.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail based on the drawings. FIGS. 2A, B and C show a first embodiment of the invention. First, the inner cylindrical transducer section 21 shown in FIG. 2A, the outer cylindrical transducer section 22 shown in FIG. 2B, and the positioning member 36 shown in FIG. 2C are formed. The cylindrical transducer section 21 has lead wires 26 connected to an upper electrode 24 and a lower electrode 25 of a piezoelectric vibrator 23 made of piezoelectric ceramic. Next, an acoustic matching layer 27 made of multiple layers of synthetic resin or glass is adhered to the upper surface of the upper electrode 24, and a back load material 28 made of rubber or the like is adhered to the lower surface of the lower electrode 25. This cylindrical transducer part 21
The outer diameter is approximately φ6mm and is mainly used for transmission. As shown in FIG. 2B, the cylindrical transducer section 22 has lead wires 32 connected to the upper electrode 30 and lower electrode 31 of the piezoelectric vibrator 29 made of piezoelectric ceramic. Next, an acoustic matching layer 33 formed of multiple layers of synthetic resin or glass is adhered to the upper surface of the upper electrode 30, and a back load material 34 made of rubber or the like is adhered to the lower surface of the lower electrode 31. This cylindrical transducer section 22 has a hole 35 in the center thereof having a diameter of about 7 mm, and mainly performs reception. The positioning member 36 for positioning the cylindrical transducer part 21 and the cylindrical transducer part 22 is a circular plate with uniform overall thickness and parallel inner and outer surfaces, as shown in FIG. 2C. 37 is integrally provided with an annular projection 38. This annular projection 38
is formed to have a uniform thickness, an outer diameter of approximately 7 mm, and an inner diameter of approximately 6 mm.

Then, as shown in FIG. 2C, the positioning member 36
The cylindrical transducer part 21 is inserted and glued inside the annular projection 38 from the back load material 28 side, and the cylindrical transducer part 22 is fitted to the outside of the annular projection 38 from the back load material 34 side. and glue. In this way, the columnar and cylindrical transducer parts 21 and 22 are positioned by the positioning member 36, and a uniform gap of about 0.5 mm is formed between them. After that, apply rubber adhesive 39 to this gap.
The space between the columnar and cylindrical transducer parts 21 and 22 is maintained uniformly.

FIG. 3 shows a second embodiment of the invention. In this embodiment, the cylindrical transducer section 21 is inserted inside the positioning member 36 and the annular projection 38 from the acoustic matching layer 27 side, and the cylindrical transducer section 21 is inserted outside the annular projection 38.
2 from the acoustic matching layer 33 side to form a uniform gap of about 0.5 mm between the cylindrical transducer parts 21 and 22, and fill this gap with a rubber adhesive 39. In addition, the distance between the columnar and cylindrical transducer parts 21 and 22 is maintained uniform. After the rubber adhesive 39 has hardened, the positioning member 36 is attached to the columnar and cylindrical transducer parts 2.
Remove from 1 and 22. Therefore, the positioning member 36 can be used as a jig, which is advantageous in terms of cost. The other configurations are the same as those of the first embodiment.

Effects of the Invention As is clear from the above description, according to the present invention, a cylindrical transducer portion having a piezoelectric vibrator is inserted inside an annular projection of uniform thickness formed on a positioning member, and a piezoelectric A cylindrical transducer portion having a vibrator is fitted on the outside of the annular projection, and an adhesive is filled in the gap between the positioned cylindrical and cylindrical transducer portions to separate the cylindrical and cylindrical shapes. The distance between the outer peripheries of the transducer parts is maintained uniform. Therefore, there are advantages in that crosstalk variations can be reduced, crosstalk values can be lowered, electrical characteristics can be improved, and manufacturing is extremely easy.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway perspective view showing an ultrasonic probe in an ultrasonic Doppler probe manufactured by a conventional manufacturing method, and Fig. 2 A, B to C show ultrasonic waves in an ultrasonic Doppler probe of the present invention. FIG. 3 is an explanatory diagram showing a first embodiment of a method for manufacturing a probe, and FIG. 3 is an explanatory cross-sectional view of a second embodiment of the present invention. 21...Cylindrical transducer part, 22...
Cylindrical transducer section, 23...Piezoelectric vibrator, 24...Top electrode, 25...Bottom electrode, 26
... Lead wire, 27 ... Acoustic matching layer, 28
... Back load material, 29 ... Piezoelectric vibrator, 30 ...
Top electrode, 31... Bottom electrode, 32... Lead wire, 33... Acoustic matching layer, 34... Back load material, 36... Positioning member, 38... Annular projection, 39... Adhesive.

Claims (1)

[Claims] 1. A cylindrical transducer portion having a piezoelectric vibrator is inserted inside an annular protrusion of uniform thickness formed on a positioning member, and the cylindrical transducer portion having a piezoelectric vibrator is inserted into the annular protrusion. The method is to maintain a uniform distance between the outer circumferences of the cylindrical and cylindrical transducer parts by fitting them on the outside and filling the gap between the positioned cylindrical and cylindrical transducer parts with adhesive. Characteristic manufacturing method of ultrasonic probe.