JPS5852731Y2 - ultrasonic delay line - Google Patents

Description

[Detailed Description of the Invention] The present invention converts a predetermined electric signal into an ultrasonic signal using an input transducer made of a piezoelectric material, delays the signal by a necessary amount of time through a delay medium, and then returns the ultrasonic signal to the ultrasonic signal. This relates to an ultrasonic delay line that converts a signal into an electrical signal using an output transducer that is a piezoelectric material, and in particular, the lead wire that connects the ultrasonic delay line main body and the external connection terminal provided in the case that houses this main body. This allows for easy connection.

Conventionally, ultrasonic delay lines are configured as shown in FIGS. 1 and 2, for example.

That is, numeral 1 in the figure is a delay medium made of glass or the like formed into a polyhedron so that the ultrasonic signal can take a propagation path in which the ultrasonic signal undergoes multiple reflections.

This delay medium 1 includes an input transducer 2 formed of a piezoelectric material such as crystal or piezoelectric ceramics that converts a predetermined electric signal into an ultrasonic signal and emits liquid, and two electrodes, and converts the ultrasonic signal into an electric signal again. The output transducer 3, which is a piezoelectric material that converts into ultrasonic signals, is attached to the surfaces 5 and 6 at the first and second attachments on the side wall surfaces, which are perpendicular to the propagation plane 4 of the ultrasonic signal. A line 10 is formed.

The first and second mountings have electrodes 7 and 8 on surfaces 5 and 6.
are vapor-deposited, and piezoelectric bodies 2a and 3a are adhered to these electrodes 7 and 8 using conductive paint, respectively.

Further, the other electrode 11.12 is also deposited on one side of the piezoelectric bodies 2a, 3a facing the joining surface.

The ultrasonic delay line 10 formed as described above has a number of external connection terminals 13a, 13b corresponding to the respective electrodes 7.11 and 8.12 of the input/output transducers 2 and 3.

It is housed in a case 14 obtained by molding a synthetic resin in which 13c and 13d are arranged.

And each electrode 7°11 of the hole/output converter 2 and 3
and 8, 12 and external connection terminals 13a, 13 of case 14
b, 13c, 13d are lead wires 15a, 15b
, 15c, and 15d, respectively.

At this time, the lead wire 15a. 15b, 15c, 1
5d and each electrode 7, 11 and 8 of the input/output converters 2, 3,
12, each of the electrodes 7, 11 and 8, 12 is attached to the side wall surface of the delay medium 1 on the first and second surface 5.
6, the said first and second attachments, respectively facing the side wall 14a of the case 14, must be carried out at the plane 5.6.

Therefore, after the ultrasonic delay line 10 is housed in the case 14, the distance between the side wall 14a of the case 14 and the input/output transducers 2 and 30 is extremely small, so that the first and second attachments are performed on the surface 5. , 6 on the lead wire 15a.

15b, 15c, 15d to each electrode 7, 11 and 81
It is difficult to connect to 2.

Therefore, before storing the ultrasonic delay line 10 in the case 14, the lead wires 15a, 15b, 15c,
15d to each electrode 7, 11 and 8, 12, then the ultrasonic delay line 10 is housed in the case 14, and after being housed in the case 14, the lead wire 15a is connected again.

External connection terminals 13a, 13b, 13c are disposed on the side wall 14a of the case 14.

It is necessary to connect to 13d.

In this way, with the conventional method, the work to connect the lead wires has to be done in two parts, which not only increases the number of man-hours and significantly reduces work efficiency, but is also disadvantageous when it comes to automating manufacturing. be.

In particular, in the conventional device described above, an electrode for drawing out the lead wire is provided on the piezoelectric body, and this electrode easily peels off, resulting in poor reliability as a part for drawing out the lead wire.

Therefore, the present invention facilitates the connection of a lead wire that provides electrical continuity between an ultrasonic delay line and an external connection terminal provided in a case in which the ultrasonic delay line is housed, and also as described above. This was proposed for the purpose of providing a highly reliable device that does not cause electrode peeling at the lead wire lead-out part like the conventional ones, and the converter mounting surface and the converter mounting surface are a delay medium adjacent to each other and having main surfaces parallel to a signal propagation plane on both sides of the transducer mounting surface; a transducer having a pair of electrodes formed on the transducer mounting surface of the delay medium; a conductor filled in a groove formed on the child mounting surface and extending to the main surface, electrically connecting between the electrode of the transducer and the conductor and extending to the main surface; The IJ-wire is connected to the conductor in the groove on the main surface.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 is a plan view showing the ultrasonic delay line 20 constituting the present invention. In the figure, 21 is a polyhedral shape (in this example) so that the ultrasonic signal can undergo multiple reflections and take a sufficiently long propagation path. This is a delay medium made of glass or the like, which is formed into a hexagonal shape.

This delay medium 21 includes a piezoelectric material 18 such as crystal or piezoelectric ceramic material that converts a predetermined electric signal into an ultrasonic signal, and an input transducer having first and second electrodes 19a and 19b on both sides of the piezoelectric material 18. 22, and an output transducer 23 having first and second electrodes 29a and 29b on both sides of a piezoelectric material 28, such as crystal or piezoelectric ceramic material, which converts the ultrasonic signal back into an electric signal. The first and second attachments on the side wall surfaces, which are perpendicular to the main surface parallel to the propagation surface 24, are attached to surfaces 25 and 26.

These first and second mounting surfaces 25 and 26 to which the input/output transducers 22 and 23 are attached allow the transmitted ultrasonic signal from the input transducer 22 to pass through the delay medium 21 as shown in the figure. They are formed to face each other at a predetermined angle in order to propagate along a propagation path that undergoes multiple reflections as shown by the broken line and reach the output converter 23.

Furthermore, since the propagation surface 24 of the delay medium 21 repeats multiple reflections as described above to form a propagation path with a predetermined length, the input/output transducers 22 and 23 are attached to the surfaces 25° and 26. It has a sufficiently large area relative to the length of the side wall surface on which it is formed.

Further, the ultrasonic signal converted from an electrical signal and transmitted by the input transducer 22 is transmitted to the delay medium 22 as a guided wave.
The propagation surface 24 and the input/output converters 22 and 23 are attached to the surface 2.
5.26 and the side wall surfaces continuous to the surface 25.26 are the reflection interfaces 27a, 27b and 27c of the ultrasonic signals.
, 27d.

The first and second attachments of the input/output transducers 22.23 are formed on both sides of the surfaces 25 and 26 in the thickness direction of the delay medium 21 on both sides of each of the transducers 22.23. first and second electrodes 19a, 29a and 19b, respectively.
, 29b are electrically connected to the conductor portions 32a and 32b.
, 32c, and 32d are formed.

These conductor portions 32a and 32b. Each end face 33 of 32c and 32d, which will be a connection part with a lead wire described later, is formed to extend in a main plane parallel to the propagation plane 24 of the ultrasonic signal.

The ultrasonic delay line 20 configured in this way is manufactured through the steps shown below.

First, as shown in FIG. 4A, a polyhedral-shaped delay medium block 35 similar to the above-described delay medium 21 is formed and roughly polished, and the input/output transducers 22 and 23 are attached to the surface 2.
Two grooves 38 and 39 for embedding a conductor are formed on both sides of the two end faces 36 and 37 corresponding to 5.26 over the entire width in the thickness direction of the block 35.

Then, the grooves 38 and 39 are filled with a conductor 40 such as solder or copper, and as shown in FIG.
8. Final polishing is applied to the entire outer peripheral surfaces of the conductor 40 and the delay medium block 35 that have bulged up from 39 to make them smooth.

Next, on the end face 36.37 in which the conductor 40 is embedded, a first electrode surface 41 forming the first electrodes 19a, 29a of the human/output transducer 22.23, and a first electrode surface 41 forming the first electrodes 19a, 29a of the human/output transducer 22.23 are formed. 23
An auxiliary electrode 30a is connected to second electrodes 19b and 29b formed on the surface side of the auxiliary electrode 30a.

A second electrode surface 42, which will become 31a, is formed as shown in FIG. 4C by a method such as vapor deposition, sputtering, or coating.

At this time, the first electrode surface 41 and the second electrode surface 42 are spaced apart by a predetermined distance t, and at the same time are formed so as to be electrically connected to the conductors 40 formed on both sides of the end surfaces 36 and 37. do.

Furthermore, as shown in the fourth diagram and E, the input/output converter 2
A transducer block 43 forming 2.23 is bonded onto the first electrode surface 41 using an electrically conductive adhesive 44, such as electrically conductive paint.

A second electrode 1 is placed in advance on one side of the transducer block 43 on the surface side that does not become the bonding surface with the first electrode surface 41.
An electrode surface 45 for forming electrodes 9b and 29b is formed.

Further, as shown in FIG. 4F, the transformer block 43
The upper electrode surface 45 and the second electrode surface 42 on the delay medium block 35 are connected by a conductive adhesive 46 such as conductive paint.

In addition, at this time, the first electrode surface 4 is bonded with the adhesive 46.
1 and the second electrode surface 42 must be prevented from electrically conducting.

Then, a delay medium block 3 configured as described above is provided.
5 is cut to a predetermined thickness using a canter 47 as shown in FIG. 4G, thereby forming the ultrasonic delay line 20 (see FIG. 3) as described above.

The ultrasonic delay line 20 is placed in a case 51 obtained by molding a synthetic resin or the like, with the other end surface facing the ultrasonic signal propagation surface 24 serving as a mounting surface 50, as shown in FIG. It will be stored.

A side wall 52 is formed upright on this case 51 so as to surround the ultrasonic delay line 20 .

Each electrode 19 of each transducer 22.23 is provided at a portion of this side wall 52 facing the input/output transducer 22.23.
External connection terminals 53a, 53b, 53c, 53d in numbers corresponding to the numbers a, 29a, 19b, 29b are attached horizontally to the bottom wall 54 of the case 51, and these connection terminals 5
One end 55a of each of 3a, 53b, 53c, and 53d
, ssb , 55c , ssa are the above transformers 22.23
The propagation plane 2 of the conductor parts 32a, 32b, 32c32d
It is configured so as to look toward each end face located on the top 4.

Then, the conductor parts 32a, 32b, 32c.

32d and external connection terminals 53a, 53b, 53c.

Each end face of the conductor portions 32a, 32b, 32c, and 32d and the external connection terminals 53a, 53b, and 53c serve as connecting portions of the lead wire 56 that electrically connects the conductor portions 53d.

53d each end 55a, ssb, 55c, 55d
is the propagation surface 24 of the ultrasonic signal of the delay medium 21 having a large area.
located on a plane parallel to

That is, the connecting portion of the lead wire 56 is located in the direction of the opening surface of the case 51 that is not surrounded by the side wall 52 of the case 51.

And the connection terminals 53a, 53b, 53c.

53d, each end 55a, 55b, 55c, 55d
A lead wire 56 is simultaneously connected to each end face of the conductor portions 32a, 32b, 32c, and 32d by ultrasonic pressure bonding, soldering, or adhesion using a conductive adhesive to establish electrical continuity.

Next, the lid 57 is fitted so as to close the opening of the case 51, and an ultrasonic delay line as shown in FIG. 6 is formed.

Note that, as in the embodiment described above, the external connection terminal 53a.

53b, 53c, and 53d are attached to the case 51, as shown in FIG.
, 53b, 53c, and 53d are extended horizontally to the wide bottom wall 54 of the case 51.

Therefore, when a predetermined mounting is performed on a board, the floor area of the mounting relative to the board is too small compared to the volume of the ultrasonic delay line, resulting in unstable mounting and poor reliability.

Therefore, in electronic devices such as video tape recorders that require extremely high reliability, the bottom wall 54, which has the widest area of the ultrasonic delay line, is the mounting surface to the board for stability of the mounting state. desirable.

Therefore, external connection terminals 53a, 53b, 53c,
53d must be bent or attached, it is necessary to plant auxiliary terminals on the board so that the bottom wall 54 serves as the mounting surface.

Therefore, as shown in FIG. 7, external connection terminals 53a,
53b, 53c, and 53d are mounted on the side wall 52 so as to be perpendicular to the bottom wall 54 of the case 51, that is, the transducer mounting of the delay medium 21 is parallel to the plane 25.26.

and external connection terminals 53a and 53b. 53c, 53
d, each one end 55a, 55b, 55c.

55 d Face the opening side end surface 52a of the side wall 52.

In this way, the external connection terminal 53a. 53b, 53c
, 53d, the conductor portions 32a, 32b, 32c serve as connection portions for the lead wires 56.

32d and external connection terminals 53a and 53b.

53c, 53d, each one end 55a, ssb, sse.

55d is the propagation surface 24 of the ultrasonic signal in the delay medium 21
The lead wires 56 can be connected at once.

Furthermore, external connection terminals 53a, 53b, 53c,
53d can be mounted perpendicularly to the bottom wall 54 of the case 51 as shown in FIG.

Therefore, if the ultrasonic delay line is formed in this way,
For installation, place the mounting surface to the board on the bottom wall 5 of the case 51, which has a large area.
4 and a very stable installation can be obtained.

In addition, external connection terminals 53a, 53b, 53c.

53d is an ultrasonic delay line main body 20 placed between the corners of the side wall 52 of the case 51 in consideration of the connection of the lead wire 56.
conductor portions 32a, 32b, 32c.

It may also be installed in parallel with 32d.

As described above, according to the present invention, all the connection parts of the lead wires are connected to the opening side of the storage case in which the ultrasonic delay line is housed, that is, on the surface parallel to the propagation plane of the ultrasonic signal, which has a large opening area. It can be located at the position of

Therefore, the lead wires can be connected all at once using an adhesive method such as ultrasonic crimping, making the connection work easier and automation possible.

In addition, the external connection terminals arranged on the case can be attached in any direction as mentioned above.
The ultrasonic delay line itself can be miniaturized.

Further, in the present invention, since the conductor portion for connecting the lead wire is embedded in the recess, there is no problem of electrode peeling as in the conventional method.

[Brief explanation of drawings]

1 and 2 show a conventional ultrasonic delay line, with FIG. 1 being a perspective view thereof and FIG. 2 being a plan view thereof. FIG. 3 is a perspective view showing the ultrasonic delay line main body constituting the ultrasonic delay line according to the present invention, and FIG. 4A and FIG. 4G show the steps of forming the ultrasonic delay line main body in order FIG. FIG. 5 is an exploded perspective view of the ultrasonic delay line according to the present invention, and FIG. 6 is a plan view thereof. FIG. 7 is a perspective view showing a case for storing an ultrasonic delay line main body constituting an ultrasonic delay line according to another embodiment of the present invention, and FIG. FIG. 21... Delay medium, 24... Propagation surface,
25.26...The converter is installed on the surface, 19a, 19
b, 29a. 29 b...---electrode, 32a, 32b, 32
c, 32d...Conductor portion, 51...Ultrasonic delay line storage case, 53a, sab, 53
c jaa""" External connection terminal, 56...Lead wire.

Claims (1)

[Scope of utility model registration request] a transducer mounting surface; a delay medium having main surfaces adjacent to the transducer mounting surface and parallel to the signal propagation plane on both sides of the transducer mounting surface; and a pair of delay media formed on the transducer mounting surface of the delay medium. a transducer having an electrode, and a conductor filled in a groove formed on the transducer mounting surface and extending to the main surface,
The ultrasonic delay line is configured to electrically connect between the electrode of the transducer and the conductor, and to connect a lead wire on the main surface to the conductor in a groove extending on the main surface.