JPH07222287A - Sound wave converging transducer and manufacture of the same - Google Patents

Abstract

PURPOSE:To provide the manufacture of an ultrasonic probe for which cutting work is facilitated, one time of polarizing processing is enough and the generation rate of a defective product is reduced by using a polymer piezoelectric body and using a cutting die. CONSTITUTION:The circular flat plate of the polymer piezoelectric body is prepared, and polarizing processing is executed by loading an electric field to the circular plate. Concerning a molded article M, a central disk 10 and a second concentric ring 12 provided with an omitted part are connected by a band-shaped link plate 101, concerning a molded article N, first and second concentric rings 11 and 13 provided with omitted parts so as not to cross the band-shaped linking plate 101 are connected by a band-shaped linking plate 102 arranged at a symmetric position of the band-shaped linking plate 101 to the circular flat plate and while using the cutting die, the circular flat plate is cut into the molded articles M and N. Then the molded article N is stuck to an acoustic absorbing member 3 as an insulated object and next, the molded article M is turned over and stuck to the acoustic absorbing member so that the adjacent concentric rings can be reverse electrodes. Since the polymer piezoelectric body is used, cutting work is facilitated and the production process is simplified like one time of polarizing processing as the molded article is turned over and stuck to.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piezoelectric acoustic wave focusing transducer of a polymer piezoelectric material used as an ultrasonic probe used in an ultrasonic diagnostic apparatus and the like and a method of manufacturing the same.

[0002]

2. Description of the Related Art FIG. 2 is a schematic view of an ultrasonic diagnostic apparatus and the like. The ultrasonic probe 1 is applied to the subject, and an electric pulse is applied to the ultrasonic probe 1 from the transmission control unit 30 based on the operation of the operation unit 20. The ultrasonic probe 1 converts the received electric pulse into ultrasonic waves and outputs the ultrasonic waves to the subject. The ultrasonic waves reflected inside the subject are detected by the ultrasonic probe 1, converted into electric signals, and further processed by the transmission control unit 30 to be displayed on the display unit 40.
Displays the internal status of the subject.

Conventionally, as this ultrasonic probe, PZT (lead zirconate titanate) or the like which is an inorganic piezoelectric material or a piezoelectric polymer band is formed into a plurality of concentric rings. As shown in FIG. 3, the concentric ring piezoelectric bodies adjacent to each other in advance are polarized in the opposite direction and insulated. Polarization refers to a process of applying an electric field to a piezoelectric body to divide it into a positive electrode and a negative electrode. Further, as shown in FIG. 4, when the polarization directions are not reversed, the adjacent concentric annular piezoelectric bodies are formed with a step so that they are displaced from each other from the focal points where the ultrasonic waves are strengthened in order to match the phases and increase the output. Was.

[0004]

In the conventional manufacturing method, PZT has a problem in workability and many defective products are produced during the manufacturing process. Further, as shown in FIG. 3, when a polymer piezoelectric material is used and the electrodes of the concentric annular piezoelectric material adjacent to each other are reversed, it is necessary to manufacture through the process of twice polarization.

[0005]

In order to solve these drawbacks, the present invention has the following structure and manufacturing method.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 2, FIG. 3, and FIG. 1 are views showing a sound pressure focusing type transducer of a polymer pressure body according to the present invention and a manufacturing process thereof. FIG. 4 is a block diagram of an ultrasonic diagnostic apparatus using the acoustic wave focusing type transducer according to the present invention as an ultrasonic probe.

First, a method of manufacturing the acoustic wave focusing type transducer will be described. (1) First, a circular plate of a polymer voltage body shown in the plan view and side view of FIG. 2 is prepared. (2) Next, an electric field is applied to this disk to perform polarization processing.

(3) Next, as shown in the plan view of FIG. 3 and the sectional view taken along the line AA, the central disc 10 and the second concentric ring 12 having a notch are formed into a band-shaped connecting plate 101. The connected product is a molded product M, and a first concentric ring 11 and a third concentric ring 13 having a notch so as not to intersect with the band-shaped connecting plate 101 are provided on the circular flat plate 2 and the band-shaped connecting plate. 1
01 is connected by a band-shaped connecting plate 102 arranged at a symmetrical position to form a molded product N, and the circular flat plate 2 is extracted into a molded product M and a molded product N with a cutting die.

(4) First, the acoustic absorber 3 which is an insulator
As shown in the plan view and the cross-sectional view taken along the line BB, the molded product N is attached, and the molded product M is turned upside down so that the adjacent concentric rings are opposite electrodes. Put on.

(5) Lead wires are connected to the terminals 103 and 104 with a conductive adhesive material.

It can be configured as described above. In the present invention, it is not necessary to connect every other concentric ring when forming the electrode terminals in the subsequent step.

It is also possible to increase the ultrasonic power in the focal range by increasing the aperture and increasing the number of rings.

[0013]

EFFECTS OF THE INVENTION Since the acoustic wave focusing type transducer according to the present invention uses a polymeric piezoelectric material, it can be easily cut. Moreover, in order to manufacture a concentric ring, it can be easily done using a punching die, and further, only one polarization process and a simple manufacturing process of inverting and pasting one of the molded products are required, which is an economical effect. Is to have.

[Brief description of drawings]

FIG. 1 is a diagram showing a piezoelectric acoustic wave focusing transducer of a polymer piezoelectric material according to the present invention.

FIG. 2 is a diagram showing a manufacturing process of a piezoelectric acoustic wave focusing transducer of a polymer piezoelectric material according to the present invention.

FIG. 3 is a diagram showing a manufacturing process of the acoustic wave focusing transducer of the piezoelectric polymer according to the present invention.

FIG. 4 is a schematic diagram of an ultrasonic diagnostic apparatus.

FIG. 5 is a conventional acoustic wave focusing transducer.

FIG. 6 is a conventional acoustic wave focusing transducer.

[Explanation of symbols]

 1 Probe 2 Circular Flat Plate 3 Acoustic Absorber 10 Central Disk 11, 12, 13 Concentric Ring 20 Operation Unit 30 Transmission / Reception Control Unit 40 Display Unit

Claims (2)

[Claims] 1. A method of manufacturing an acoustic wave focusing type transducer comprising the following steps. (A) A circular flat plate made of a piezoelectric polymer is manufactured. (B) Polarize this circular plate. (C) From the central disc and outward from the central disc,
Of the even numbered concentric rings having a notch so as not to intersect with the connecting plate of No. 1 and a first connecting plate that connects the even numbered concentric annular rings, and the central disk. A second molded product composed of an odd-numbered concentric ring having a notch so as not to intersect with the first coupling plate toward the outside and the second coupling plate coupling the odd-numbered concentric ring; Using a die, pull out from the circular plate in line symmetry. (D) Either the first molded product or the second molded product is turned upside down around the line of symmetry and the first and second molded products are attached to the sound absorbing material. 2. A central piezoelectric disc, which is a polymer piezoelectric material attached to an acoustic absorber, and a plurality of concentric circular rings, and a concentric circular ring located outside the central circular plate to a concentric circular ring located outside thereof. Every other one is connected by the second connecting plate, and the central disc is connected to the first connecting plate by connecting the concentric circles which are not connected to the second connecting plate on the outside thereof with the first connecting plate. Each of the concentric rings has a notch so as not to intersect with the first connecting plate, and each of the concentric rings that communicates with the first connecting plate has a notch so as not to intersect with the second connecting plate. A piezoelectric transducer of acoustic wave focusing type, wherein the polarization directions of the concentric ring connected to the second connecting plate are opposite to those of the central disk and the concentric ring connected to the connecting plate.