JPH0851305A - External terminal for irreversivle circuit element - Google Patents

Abstract

PURPOSE:To provide a small external terminal where the occurrence of floating capacitance is suppressed through the use of the through hole of a substrate by inserting the insertion part of the external terminal into the through hole for external terminal connection and fixing it by of soldering and the like. CONSTITUTION:The through hole TH is formed at the peripheral part of the capacitance substrate 4 forming an irreversible element, and a conductor pattern 6b is formed at the periphery. The external terminal 20 consists of conductive metal, and it is constituted of a vertical piece 21, a planer piece 22 and the insertion part 23. The vertical piece 21 is erected at right angles on one end in the longitudinal direction of the planer pice 22, and it has the same height as the side of the substrate 4. The insertion part 23 is erected in the same direction as the vertical piece 21 at the other end. The insertion part 23 consists of a rectangular plate, and it has width slightly narrower than the diameter of the through hole TH and has the height equal to the length of the through hole TH. At the time of inserting the terminal 20 into the substrate 40, the insertion part 23 is inserted into the through hole TH, and the vertical piece 21 is made to abut on the side of the substrate 4. Molten solder 30 is poured into the through hole TH, the terminal 20 is connected to the pattern 6b and fixed to the substrate 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an external terminal of a nonreciprocal circuit device such as an isolator or a circulator.

[0002]

2. Description of the Related Art Conventionally, a lumped-constant type isolator is a high-frequency component that allows a signal to pass in the transmission direction without loss and does not allow a wave signal to pass in the reverse direction. Widely used as machine parts. The isolator has a structure in which a central conductor is sandwiched by one or two ferrites, and a direct-current magnetic field is applied perpendicularly to the ferrites by a permanent magnet to exhibit an irreversible characteristic.

Further, the lumped-constant type isolator has a structure in which resonance is utilized by providing capacitances to the three input terminals of the central conductor, and the size of the isolator is reduced.

For example, as shown in FIG. 2, a conventional isolator element includes a metal case 1, a shield plate 2 made of a conductor, a capacitor substrate 4, a disc-shaped ferrite 7 and net-shaped conductors 9a-9c and insulating films 14a, 14b. It is composed of a central conductor portion 8 surrounded by, a disk-shaped permanent magnet 11 having substantially the same area as the ferrite 7, a metal cover 12, and a chip type terminating resistor 13.

The capacitor substrate 4 has a thickness corresponding to the thickness of the ferrite 7, and an opening 4a having a predetermined area into which the ferrite 7 can be inserted and arranged is formed in the central portion thereof. Further, conductor patterns 5a to 5c for capacitance formation and conductor patterns 6a to 6c for grounding are formed around the opening 4a on the surface of the capacitance substrate 4. Also, the conductor pattern 5
Each of a, 5b, 6a and 6b is equipped with an external terminal 3 for conductive connection with the outside.

At the time of assembly, the opening 4a of the capacitance substrate 4
A central conductor portion 8 made of ferrite 7 or the like is inserted and arranged therein. Further, with the permanent magnet 11 arranged on the central conductor portion 8 and the shield plate 2 arranged under the capacitance substrate 4, all of these are housed in the metal case 1 and covered by the metal cover 12. As a result, a magnetic closed circuit is formed, and the assembly of the isolator element is completed.

Here, a notch is formed in the metal case 1 so as to correspond to the external terminal 3 so that the external terminal 3 can be wired from outside the metal case 1. It is also possible to configure the circulator by removing the terminating resistor 13.

The external terminal 3 of the non-reciprocal circuit device such as the isolator or the circulator is mounted on the lead frame 3a after mounting the additional parts after the stacking as shown in FIG. It was prepared by attaching or by attaching the external terminal (electrode) jig 3b as shown in FIG.

[0009]

However, as described above, the lead frame 3a and the external terminal jig 3b are used only for the purpose of providing the external terminal (electrode) 3 on the capacitor substrate 4, and the lead frame 3a is not used. When the external terminal 3 is formed by using it, stray capacitance is generated between the external terminal 3 and the land in the through hole portion, which adversely affects the element characteristics. Further, when the external terminal jig 3b is used, there is a problem that the number of parts is increased, the cost is increased, and the element shape is enlarged.

In view of the above problems, an object of the present invention is to provide an external terminal of a non-reciprocal circuit device which utilizes a through hole of a substrate and which is small and which suppresses the generation of stray capacitance.

[0011]

In order to achieve the above object, the present invention provides a nonreciprocal isolator or circulator having a wiring substrate having a through hole for connecting an external terminal at a peripheral edge thereof. A vertical piece that is an external terminal of a circuit element and is in contact with a side surface of the board, and one end of the vertical piece is connected to a lower end of the vertical piece and is in contact with a front surface or a back surface of the board. A plate-like piece having a length up to the hole, a lower end of which is connected to the other end of the plate-like piece, and which is erected in the same direction as the vertical piece and is insertable into the through hole for external terminal connection. The external terminal of the non-reciprocal circuit device including the insertion part having the is proposed.

According to a second aspect of the present invention, there is proposed an external terminal for a nonreciprocal circuit device according to the first aspect, wherein the upper end of the insertion portion is tapered.

According to a third aspect, in the external terminal of the nonreciprocal circuit device according to the first aspect, the insertion portion is formed in a semi-cylindrical shape so as to be substantially inscribed in the through hole for connecting the external terminal. The external terminal of the reversible circuit element is proposed.

According to a fourth aspect, in the external terminal of the nonreciprocal circuit device according to the first aspect, the length of the insertion portion is longer than the length of the through hole for connecting the external terminal. Propose the external terminals of the device.

Further, in claim 5, in the external terminal of the non-reciprocal circuit device according to claim 4, the external terminal of the non-reciprocal circuit device in which the insertion portion has a cylindrical shape is proposed.

According to a sixth aspect of the present invention, there is provided an external terminal of a non-reciprocal circuit device such as an isolator or a circulator having a wiring substrate having a through hole for connecting an external terminal at a peripheral portion thereof, the front surface or the back surface of the substrate. Abut
From an electrode piece having an area larger than the opening area of the external terminal connecting through hole, and an insertion portion provided upright on one surface of the electrode piece and having a width that can be inserted into the external terminal connecting through hole. We propose an external terminal for non-reciprocal circuit devices.

According to a seventh aspect, in the external terminal of the nonreciprocal circuit element according to the sixth aspect, the external terminal of the nonreciprocal circuit element in which the upper end portion of the insertion portion is formed in a tapered shape is proposed.

According to claim 8, in the external terminal of the nonreciprocal circuit device according to claim 6, the insertion part is formed in a semi-cylindrical shape so as to be substantially inscribed in the through hole for connecting the external terminal. The external terminal of the reversible circuit element is proposed.

According to a ninth aspect, in the external terminal of the nonreciprocal circuit device according to the sixth aspect, the length of the insertion portion is longer than the length of the external terminal connecting through hole. Propose the external terminals of the device.

Further, in claim 10, the external terminal of the non-reciprocal circuit device according to claim 9 proposes an external terminal of the non-reciprocal circuit device in which the insertion portion has a cylindrical shape.

[0021]

According to the first aspect of the present invention, the vertical piece that abuts the side surface of the substrate and one end of the vertical piece is connected to the lower end of the vertical piece and abuts on the front surface or the back surface of the substrate. A plate-shaped piece having a length up to the through hole for connection, and a lower end connected to the other end of the plate-shaped piece, is erected in the same direction as the vertical piece, and is inserted into the through hole for external terminal connection. The external terminal is composed of the insertion portion having a possible width. When the external terminal is attached, the insertion portion is inserted into the external terminal connecting through hole. As a result, the plate-shaped piece is brought into contact with the front surface or the back surface of the substrate, and the vertical piece is brought into contact with the side surface of the substrate.
In this state, the external terminals are fixed by soldering or the like.

According to the second aspect, the upper end portion of the insertion portion is formed in a tapered shape, that is, a tapered shape, and the insertion portion can be easily inserted into the through hole for connecting an external terminal.

According to the third aspect, the insertion portion is formed in a semi-cylindrical shape so as to be substantially inscribed in the through hole for connecting the external terminal.

According to a fourth aspect of the present invention, the length of the insertion portion is longer than the length of the external terminal connecting through hole, and the tip of the insertion portion protruding from the through hole is bent or caulked. After being fixed by the above, it is fixed by soldering or the like.

Further, according to the fifth aspect, the insertion portion has a cylindrical shape, and the tip portion thereof can be easily caulked.

According to a sixth aspect of the present invention, an electrode piece that is in contact with the front surface or the back surface of the substrate and has an area larger than the opening area of the through hole for external terminal connection is provided on one surface of the electrode piece. The external terminal is formed of an insertion portion that is provided and has a width that can be inserted into the external terminal connecting through hole. When the external terminal is attached, the insertion portion is inserted into the external terminal connecting through hole. As a result, the electrode piece is brought into contact with the front surface or the back surface of the substrate, and in this state, the external terminal is fixed by soldering or the like.

Further, according to claim 7, the upper end portion of the insertion portion is formed in a tapered shape, and the insertion portion can be easily inserted into the through hole for connecting an external terminal.

Further, according to the eighth aspect, the insertion portion is formed in a semi-cylindrical shape so as to be substantially inscribed in the through hole for connecting the external terminal.

According to a ninth aspect of the present invention, the length of the insertion portion is longer than the length of the external terminal connecting through hole, and the tip of the insertion portion protruding from the through hole is bent or caulked. After being fixed by the above, it is fixed by soldering or the like.

Further, according to the tenth aspect, the insertion portion has a cylindrical shape, and the tip portion thereof can be easily caulked.

[0031]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 (a) and 1 (b) are configuration diagrams showing a main part in a first embodiment of the present invention. In the figure, the same components as those of the conventional example are represented by the same reference numerals. That is, 4 is a capacitive substrate forming a non-reciprocal circuit element, a through hole TH is formed in the peripheral portion thereof, and a conductor pattern 6b is formed around the through hole TH.

Reference numeral 20 denotes an external terminal, which is made of a conductive metal,
It is composed of a vertical piece 21, a plate-shaped piece 22 and an insertion portion 23. The vertical piece 21 is erected at a right angle to one end of the plate-shaped piece 22 in the longitudinal direction, and has the same height as the side surface of the capacitive substrate 4. The plate-shaped piece 22 has a length from the side surface of the capacitor substrate 4 to the substantially central position of the through hole TH, and the insertion portion 23 is provided upright at the other end in the same direction as the vertical piece 21. The insertion portion 23 is made of a rectangular plate and has a width slightly narrower than the diameter of the through hole TH, and the height thereof is the through hole T.
It is set equal to the length of H.

The external terminal 2 of this embodiment having the above-mentioned structure
In the case of 0, the insertion portion 23 is inserted into the through hole TH when it is mounted on the capacitance substrate 4. As a result, as shown in FIGS. 1B and 5, the vertical piece 21 abuts on the side surface of the capacitance substrate 4, and the plate-shaped piece 22 abuts on the back surface of the capacitance substrate 4. In this state, the melted solder 30 is poured into the through hole TH, and the external terminal 20 is conductively connected to the conductor pattern 6b and fixed to the capacitance substrate 4.

Therefore, according to this embodiment, no stray capacitance is generated between the conductor pattern at the peripheral portion of the through hole, good element characteristics can be obtained, and reliability of external terminal connection is improved. Can be increased. Further, the element shape does not become large.

Next, a second embodiment of the present invention will be described.
FIG. 6 is a block diagram showing the essential parts of the second embodiment. In the figure, the same components as those in the first embodiment described above are designated by the same reference numerals and the description thereof will be omitted. Further, the difference between the first embodiment and the second embodiment is that the external terminal 20 is provided with an insertion portion 24 having a tapered tip. That is, the upper end of the insertion portion 24 is formed in a tapered shape. This allows the insertion portion 24 of the external terminal 20 to be easily inserted into the external terminal connecting through hole TH when the external terminal 20 is mounted on the capacitance substrate 4.

Next, a third embodiment of the present invention will be described.
FIG. 7 is a block diagram showing the essential parts of the third embodiment. In the figure, the same components as those in the first embodiment described above are designated by the same reference numerals and the description thereof will be omitted. Further, a difference between the first embodiment and the third embodiment is that the external terminal 20 is provided with an insertion portion 25 formed in a semi-cylindrical shape. That is,
The insertion portion 25 has a shape in which a cylinder having a diameter slightly shorter than the through hole TH is vertically divided, and the lower end thereof is connected to the other end of the plate-shaped piece 22. As a result, it is possible to reduce damage to the inner wall surface of the through hole at the time of insertion into the through hole, and when the external terminal 20 is mounted on the capacitor substrate 4, the insertion portion 25 of the external terminal 20 has the through hole TH for connecting the external terminal.
Almost inscribed in the external terminal 20 and the through hole TH
Good connection with the surrounding conductor pattern can be achieved.

Next, a fourth embodiment of the present invention will be described.
FIG. 8 is a block diagram showing the essential parts of the fourth embodiment. In the figure, the same components as those in the first embodiment described above are designated by the same reference numerals and the description thereof will be omitted. Further, the difference between the first embodiment and the fourth embodiment is that the external terminal 20 is provided with a cylindrical insertion portion 26. That is, the insertion portion 26 has a cylindrical shape with a diameter slightly shorter than the through hole TH, and the lower end thereof is connected to the other end of the plate-shaped piece 22. As a result, it is possible to reduce damage to the inner wall surface of the through hole when the external terminal 20 is inserted into the through hole.
When the capacitor board 4 is mounted, the insertion portion 2 of the external terminal 20
Since 5 is almost inscribed in the external terminal connecting through hole TH, the external terminal 20 and the conductor pattern around the through hole TH can be connected well.

The length of the insertion portion 26 is set to the through hole T.
By forming the insertion portion 26 into the through hole TH by forming the insertion terminal 26 longer than the length H, the tip of the insertion portion 26 is caulked to fix the external terminal to the capacitance substrate 4. Therefore, it is possible to improve the work efficiency and the mounting strength.

Incidentally, in the above-mentioned first to fourth embodiments,
If the external terminal 20 is provided with a vertical piece, but the connection is not made from the side surface of the capacitor substrate 4, FIG.
Similar effects can be obtained even with an external terminal 20 'having no vertical piece as shown in FIG.

Also, as shown in FIGS. 14 and 15, the external terminal 2 is provided with conical or columnar insertion portions 27, 28 provided at the center of one surface of a disk-shaped plate-shaped piece 22 '.
Even if it is 0 ", the same effect can be obtained.

[0041]

As described above, according to the first aspect of the present invention, the insertion portion of the external terminal is inserted into the through hole for connecting the external terminal and fixed by soldering or the like, so that the through hole is required. It is possible to surely obtain a good conductive state even in a high frequency band, reduce the stray capacitance generated in the through hole, and obtain good device characteristics. Further, the shape can be made small, and the cost can be reduced. Further, since the vertical portion of the external terminal is exposed on the side surface of the substrate, the connection work from the outside can be easily performed.

According to the second aspect, in addition to the above effects, the upper end portion of the insertion portion is formed in a tapered shape, and the insertion portion can be easily inserted into the through hole for external terminal connection. The work can be simplified.

According to claim 3, in addition to the above effect, since the insertion portion is formed in a semi-cylindrical shape so as to be substantially inscribed in the through hole for external terminal connection, the insertion into the through hole. At times, it is possible to reduce damage to the inner wall surface of the through hole.

According to the fourth aspect, in addition to the above effects, the insertion portion protruding from the through hole can be fixed by bending or caulking, and then fixed by soldering or the like. Strength can be increased.

Further, according to claim 5, in addition to the above effect, the insertion portion has a columnar shape, and the tip portion thereof can be easily caulked, so that the mounting strength can be further enhanced.

Further, according to the present invention, since the insertion part of the external terminal is inserted into the through hole for connecting the external terminal and fixed by soldering or the like, a good conduction state required for the through hole can be obtained in the high frequency band. In addition, it is possible to surely obtain it, and it is possible to reduce the stray capacitance generated in the through hole, and it is possible to obtain good element characteristics. Furthermore, the shape can be made smaller,
The cost can be reduced.

Further, according to claim 7, in addition to the above effects, the upper end portion of the insertion portion is formed in a tapered shape, and the insertion portion can be easily inserted into the through hole for external terminal connection. The work can be simplified.

According to claim 8, in addition to the above effect, since the insertion portion is formed in a semi-cylindrical shape so as to be substantially inscribed in the through hole for external terminal connection, the insertion into the through hole. At times, it is possible to reduce damage to the inner wall surface of the through hole.

According to the ninth aspect, in addition to the above effects, the insertion portion protruding from the through hole can be fixed by bending or caulking, and then fixed by soldering or the like. Strength can be increased.

Further, according to the tenth aspect, in addition to the above effect, since the insertion portion has a columnar shape and the tip portion thereof can be easily caulked, the mounting strength can be further enhanced.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a main part of a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a conventional non-reciprocal circuit device.

FIG. 3 is a configuration diagram showing an external terminal of a conventional example.

FIG. 4 is a configuration diagram showing an external terminal of a conventional example.

FIG. 5 is a sectional view showing a mounted state of the first embodiment of the present invention.

FIG. 6 is a configuration diagram showing a main part of a second embodiment of the present invention.

FIG. 7 is a configuration diagram showing a main part of a third embodiment of the present invention.

FIG. 8 is a configuration diagram showing a main part of a fourth embodiment of the present invention.

FIG. 9 is a sectional view showing an application example of the fourth embodiment of the present invention.

FIG. 10 is a configuration diagram showing an external terminal of another embodiment of the present invention.

FIG. 11 is a configuration diagram showing an external terminal of another embodiment of the present invention.

FIG. 12 is a configuration diagram showing an external terminal of another embodiment of the present invention.

FIG. 13 is a configuration diagram showing an external terminal of another embodiment of the present invention.

FIG. 14 is a configuration diagram showing an external terminal of another embodiment of the present invention.

FIG. 15 is a configuration diagram showing an external terminal of another embodiment of the present invention.

[Explanation of symbols]

1 ... Metal case, 2 ... Shield plate, 3 ... External terminal, 4 ...
Capacitance substrate, 5a to 5c, 6a to 6c ... Conductor pattern, 7
... ferrite, 8 ... central conductor part, 9a to 9c ... conductor, 1
1 ... Permanent magnet, 12 ... Metal cover, 13 ... Termination resistor,
14a, 14b ... Insulating film, 20, 20 ', 20 "
... External terminals, 21 ... Vertical pieces, 22, 22 '... Plate-shaped pieces, 2
3-28 ... insertion part, TH ... through hole.

Claims (10)

[Claims] 1. An external terminal of a nonreciprocal circuit device such as an isolator or a circulator having a wiring substrate having a through hole for connecting an external terminal at a peripheral edge thereof, and a vertical piece that abuts a side surface of the substrate, One end is connected to the lower end of the vertical piece and is in contact with the front surface or the back surface of the substrate, and has a plate-like piece having a length from the side surface of the substrate to the through hole for external terminal connection, and the other end of the plate-like piece. An external terminal of a non-reciprocal circuit device, comprising: an insertion portion having a lower end connected to the vertical piece and standing in the same direction as the vertical piece and having a width capable of being inserted into the external terminal connecting through hole. 2. The external terminal of the non-reciprocal circuit device according to claim 1, wherein an upper end portion of the insertion portion is formed in a tapered shape. 3. The external terminal of the nonreciprocal circuit device according to claim 1, wherein the insertion portion is formed in a semi-cylindrical shape so as to be substantially inscribed in the through hole for connecting the external terminal. 4. The external terminal of a nonreciprocal circuit device according to claim 1, wherein the length of the insertion portion is longer than the length of the through hole for connecting the external terminal. 5. The external terminal of the nonreciprocal circuit device according to claim 4, wherein the insertion portion has a cylindrical shape. 6. An external terminal of a non-reciprocal circuit device such as an isolator or a circulator having a wiring board having a through hole for connecting an external terminal at a peripheral edge thereof, the external terminal being in contact with a front surface or a back surface of the board, It is composed of an electrode piece having an area larger than the opening area of the external terminal connecting through hole, and an insertion portion that is erected on one surface of the electrode piece and has a width that can be inserted into the external terminal connecting through hole. An external terminal of a non-reciprocal circuit device characterized in that 7. The external terminal of a nonreciprocal circuit device according to claim 6, wherein an upper end of the insertion portion is formed in a tapered shape. 8. The external terminal for a nonreciprocal circuit device according to claim 6, wherein the insertion portion is formed in a semi-cylindrical shape so as to substantially inscribe the through hole for connecting the external terminal. 9. The external terminal of a nonreciprocal circuit device according to claim 6, wherein the length of the insertion portion is longer than the length of the through hole for connecting the external terminal. 10. The external terminal of the non-reciprocal circuit device according to claim 9, wherein the insertion portion has a cylindrical shape.