JPH0543770Y2 - - Google Patents

Description

[Detailed description of the invention] [Summary] This invention is a printed circuit board that has a pattern that is electrically conductive on both sides and a pattern that is electrically isolated on the same surface as a part of this pattern on a flexible substrate. The ultrasonic transducer is characterized by an electrode structure in which two electrodes of an electroacoustic element are joined to mutually separated patterns on the same surface using a plate.

[Industrial application field]

The present invention relates to an electrode structure of an ultrasonic transducer used in various medical devices such as ultrasonic diagnostic equipment.

[Conventional technology]

In the electrode structure of conventional ultrasonic transducers, single-plate transducers use wire rods, or metal foils for particularly high-frequency transducers. This structure has a somewhat large transducer shape,
This method was effective when the number of electrodes to be taken out was small.

In addition, in array-type transducers with a large number of elements, a flexible printed board with a conductive pattern for connecting the electrodes of the electroacoustic transducer elements is used to efficiently and reliably connect a large number of electrodes. It has a structure that allows it to be taken out high.

[Problem that the invention attempts to solve]

The present invention provides a structure particularly suitable as an electrode structure for an array type transducer having a large number of electroacoustic transducer elements. Conventionally, such array-type transducers use a flexible printed board on which a conductor pattern is formed for connecting the electrodes of the elements to connect the electrodes of the elements. It is easy to take out only one of them, but
Regarding the other electrode, the wire rods were soldered and the electrodes were taken out individually, which caused problems such as not being able to reduce the number of man-hours and reducing the reliability of the joint surface that was joined first.

Therefore, in the present invention, by devising the structure of the conductor pattern for electrode bonding on a single flexible printed board, we provide an electrode structure that allows the conductor pattern and the electrodes on both sides of the element to be bonded all at once. The purpose is to reduce the number of process steps and improve the reliability of bonding.

[Means for solving problems]

FIG. 1 is a sectional view showing the basic configuration of the electrode structure of the present invention.

In FIG. 1, reference numeral 1 denotes an ultrasonic transducer, and electrodes 1 are provided on both sides of the electroacoustic transducer 10.
1 and 12 are provided. 2 is a flexible printed board, and conductor patterns 21, 22, and 23 are formed on both sides of a board 20 made of a flexible electrical insulator.

The feature of this flexible printed board 2 is the structure of the conductor pattern, and the conductor pattern 21 provided on one side of the board 20 is electrically connected to the conductor pattern 22 formed on the other side. Furthermore, a conductor pattern 23 electrically insulated from the conductor pattern 22 is formed on the other surface.

A conductor pattern 22 of the printed board 2 is bonded to the end of one electrode 11 of the electric/acoustic transducer 10 . This printed board 2 is rolled up to sandwich the ultrasonic transducer 1 by utilizing its flexibility, and a conductor pattern 23 is provided on the same surface as the conductor pattern 22 and is separated from the conductor pattern 22. It is joined to the end of the other electrode 12 of the electric/acoustic conversion element 10.

These electrodes 11, 12 and conductor patterns 22, 23
The bonding can be carried out by a heat bonding method using an ordinary heat bonding chip or the like.

[Effect]

As explained above, the electrode structure according to the present invention is
The configuration of the conductor patterns 21, 22, 23 formed on both sides of the substrate 20 of the flexible printed board 2 is as follows.
A conductor pattern 21 provided on one surface and a conductor pattern 22 provided on the other surface are electrically connected, and a conductor pattern 23 separated from the conductor pattern 22 is provided on the other surface. The patterns 22 and 23 are folded to sandwich the electrodes 11 and 12 of the ultrasonic transducer 1, and the conductor patterns 22 and 23 are bonded to the electrodes 22 and 23, respectively, reducing the number of man-hours in the electrode extraction process. Particularly when applied to extracting the electrodes of an ultrasonic transducer in which elements are arranged in an array, the advantage of being able to bond them all at once and reducing the number of man-hours is extremely large.

〔Example〕

FIG. 2 is a plan view showing an example of the printed board 2, which is particularly applicable to the electrode structure of the ultrasonic transducer in which a large number of elements are arranged in an array type as described above. Figure 2a shows the back side, and figure 2b shows the front side. Components in the drawings that correspond to those in FIG. 1 are designated by corresponding reference numerals.

Conductor pattern 21 provided on one side of the substrate
are the conductor patterns 22, 22 provided on the other surface.
A conductor pattern 22,
Conductor patterns 23, 23 are provided separately from the conductor patterns 22, 22 corresponding to the conductor patterns 22, 22.
Further, the conductor patterns 22, 22 and 23, 23 are separated into a plurality of pieces. Therefore, if the electrodes of the ultrasonic transducer arranged in an array are connected to the conductor patterns 22, 22 and 23, 23 respectively in the same manner as explained in FIG. 1, the electrodes can be taken out all at once. It is something that

FIG. 3 is a diagram showing another example of the flexible printed board 2 used in the electrode structure of the present invention. In the figure, the same parts as in FIGS. 1 and 2 are designated by the same reference numerals. Conductor pattern 2 shown by dotted lines in the figure
2, 22 and conductor patterns 23, 23 are shown in Figure 2a.
The conductor pattern 21 shown in solid lines corresponds to the pattern on the back surface of the printed board shown in FIG. 2b, and the pattern on the front surface of the printed board shown in FIG. In this example, the conductor pattern 21 has a 21
It is formed to have a wide width as indicated by a and 21b. Therefore, the electrodes 11, 12 of the ultrasonic transducer 1 are bonded to the conductor patterns 22, 22 and 23, 23, and the conductor pattern 21 has a wide portion 21.
a and 21b can be configured to cover the entire circumference of the ultrasonic transducer 1 from the outside. By doing so, the influence of disturbance noise can be prevented.

The reduction of the influence of disturbance noise by placing the conductor pattern 21 outside the ultrasonic transducer 1 is the same in the examples of FIGS. 1 and 2, but the example of FIG. Transducer 1
By covering the entire circumference of the conductor pattern 21, this effect is made even more remarkable.

FIG. 4 is a diagram showing a method of forming a conductor pattern on the printed board 2, and in particular, the conductor pattern 21.
FIG. 3 is a diagram for explaining a method of connecting the conductive pattern 22 and the conductive pattern 22. FIG. In the figure, 20 is a substrate, 21, 22, 2
3 is a conductor pattern, which corresponds to the conductor patterns shown in FIGS. 1 to 3. The conductor pattern 21 on one side of the board 20 and the conductor pattern 22 on the other side are electrically connected, and the method for this is to use through holes 30 as shown in FIG. How to twist and connect,
As shown in Figure b, the tip of the substrate 20a of the conductor pattern 21 is removed by etching or the like, and the other side of the substrate 20 is folded back to form the conductor pattern 22. As shown in Figure c, the conductor foil 31 A method may be adopted in which the conductor pattern 21 is extended and connected, and then folded back to the other surface of the substrate 20. The flexible printed board 2 used in the present invention can be made of a polyimide film of 20 to 30 microns.

[Effects of this invention]

As explained above, according to the present invention, due to the configuration of the conductor pattern of the flexible printed board 2,
Since the printed board 2 is bent and joined so that the electrodes 11 and 12 of the ultrasonic transducer 1 are sandwiched between the conductor patterns 22 and 23, the number of man-hours required for taking out the electrodes can be reduced. It is suitable as an electrode structure for a multi-element type ultrasonic transducer so that the acoustic transducing elements are arranged in an array.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the basic structure of the electrode structure of the present invention, FIG. 2 is a plan view showing an example of the printed board 2, and FIG. 3 is a diagram showing another structure of the printed board 2.
FIG. 4 is a diagram for explaining a method of forming a conductor pattern. In the figure, 1 is an ultrasonic transducer, 2 is a flexible printed board, 10 is an electric/acoustic transducer, 11, 12 are electrodes, 20 is a substrate, 21, 2
2 and 23 are conductor patterns.

Claims (1)

[Claims for Utility Model Registration] (1) An electrical insulator 20 has a first electrical conductor pattern 21 on one surface, second and third electrical conductor patterns 22 and 23 on the other surface, and one The first pattern 21 on the surface is similar to the second pattern provided on the other surface.
The pattern 22 is electrically connected to the third pattern 2 provided on the same surface.
3 includes a flexible printed board 2 having an electrically insulated structure, with the second pattern 22 of the printed board 2 on one electrode surface 11 of the electroacoustic transducer 10, and the second pattern 22 on the other electrode surface 12. An electrode structure of an ultrasonic transducer 1 characterized in that the third pattern 23 of the printed board 2 is electrically connected. (2) Utility model registration In the electrode structure of the ultrasonic transducer described in claim 1, the second conductor pattern 22 and the third conductor pattern of the printed board 2
An electrode structure for an ultrasonic transducer characterized in that the conductor pattern 23 is separated into a plurality of pieces, and electrodes of different electroacoustic transducer elements are connected to each separated pattern.