JP2006094290A - Nonreciprocal circuit element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nonreciprocal circuit element which has the few number of components and excellent productivity and is inexpensive. <P>SOLUTION: In the nonreciprocal circuit element, since an insulation base 9 provided with a terminal member 16 is located on a bottom plate 3a of a second yoke 3, configuration of forming the second yoke by insert mold to a resin case is not required unlike prior arts, and thus the inexpensive nonreciprocal circuit element with excellent productivity can be obtained, also the few number of components, excellent productivity and inexpensiveness of the nonreciprocal circuit element is attributable to the constitution in which first electrodes 11a of capacitors C1, C2 are connected to the terminal member 16 provided in the insulation base 9. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an irreversible circuit element including an isolator or a circulator applied to an antenna duplexer or the like.

  FIG. 11 is an exploded perspective view of a conventional non-reciprocal circuit element. Next, a configuration when the conventional non-reciprocal circuit element is applied to an isolator will be described with reference to FIG. A box-shaped first yoke 51, a square plate-shaped magnet 52 disposed in the first yoke 51, a disk-shaped ferrite member 53 disposed in the lower portion of the magnet 52, and 120 degrees Three first, second, and third central conductors 54, 55, and 56 that are attached to the ferrite member 53 at intervals and are partially crossed with each other, and a box that holds the ferrite member 53 And a U-shaped second yoke 58 disposed under the resin case 57.

And the magnet 52 is accommodated in the box-shaped 1st yoke 51, and the upper surface of the magnet 52 is adhere | attached on the inner surface of the 1st yoke 51 with the adhesive agent.
The first, second, and third center conductors 54, 55, and 56 are formed by punching a metal plate, and are formed to extend outward from a circular ground portion 70 located in the center. Each of the first, second, and third center conductors 54, 55, and 56 has first, second, and third port portions 54a, 55a, and 56a provided at end portions.

  The first, second, and third center conductors 54, 55, and 56 are arranged such that the ground portion 70 is first disposed on the lower surface of the ferrite member 53. In this state, the first, second, and third core conductors are disposed. The center conductors 54, 55, and 56 are bent along the side surface and the upper surface of the ferrite member 53.

  At this time, although not shown here, each of the first, second, and third center conductors 54, 55, and 56 positioned on the upper surface of the ferrite member 53 is vertically insulated while being insulated via a dielectric. Has been placed.

  The resin case 57 has a bottom wall 57b having a rectangular hole 57a at the center and a side wall 57c protruding upward from four sides of the bottom wall 57b. It is formed by insert molding together with the letter-shaped second yoke 58.

  The U-shaped second yoke 58 has a bottom plate 58a and a pair of side plates 58b bent upward from both ends of the bottom plate 58a. A part of the bottom plate 58a is exposed from the hole 57a. A plurality of terminals 59a, 59b, 59c are embedded in the side wall 57c of the resin case 57 located between the pair of side plates 58b.

  The ferrite member 53 to which the first, second, and third center conductors 54, 55, and 56 are attached is disposed in the hole 57a, and the first, second, and third center conductors 54, 55, and 56 are disposed. Is connected to the second yoke 58.

  Chip-type capacitors 62, 63, and 64, which are electronic components, and chip-type resistor 65 are arranged on bottom wall 57b located around hole 57a, and the lower surface electrodes of capacitor 62, 63, and 64 and resistor 65 are disposed. Are connected to terminals 59a, 59b and 59c, respectively, and the terminals 59a, 59b and 59c are connected to the ground side of the external device.

  The port portions 54a and 55a of the first and second center conductors 54 and 55 are soldered to the upper surface electrodes of the capacitors 62 and 63, and the port portion 56a of the third center conductor 56 is The upper surface electrode 64 and the upper surface electrode of the resistor 65 are soldered and connected to each other, and the port portions 54a and 55a of the first and second center conductors 54 and 55 are made of different parts. The terminal is connected to the hot side of the external device.

  Then, with the magnet 52 and the ferrite member 53 sandwiched between the first and second yokes 51 and 58 and the resin case 57, the first and second yokes 51 and 58 are coupled to each other. A magnetic closed circuit is formed by the yokes 51 and 58 to constitute a non-reciprocal circuit element. (For example, see Patent Document 1)

However, in the conventional non-reciprocal circuit element, since the second yoke 58 is integrated by the insert molding with the resin case 57, the molding die becomes complicated, the molding process is troublesome, and the productivity is low. Bad and expensive.
In addition, since each of the upper electrodes of the capacitors 62 and 63 is connected to the port portions 54a and 55a of the first and second center conductors 54 and 55, the first and second center conductors 54, From the port parts 54a and 55a side of 55, a terminal part which consists of another parts for connecting with an external apparatus is needed, a number of parts increases, cost is high, and productivity worsens.

JP 2001-24406 A

In the conventional non-reciprocal circuit element, since the second yoke 58 is integrated by insert molding with the resin case 57, the molding die becomes complicated, the molding process is troublesome, and the productivity is poor. There is a problem of high costs.
In addition, since each of the upper electrodes of the capacitors 62 and 63 is connected to the port portions 54a and 55a of the first and second center conductors 54 and 55, the first and second center conductors 54, From the port portions 54a and 55a side of 55, there is a need for a terminal portion made of a separate part for connection to an external device, resulting in a problem that the number of parts increases, the cost is high, and the productivity is deteriorated.

  Therefore, an object of the present invention is to provide an inexpensive nonreciprocal circuit device having a small number of parts, good productivity, and low cost.

  As a first means for solving the above problems, a flat ferrite member and a ferrite member positioned on the ferrite member, provided on different surfaces in the vertical direction across the dielectric, and partially in the vertical direction First, second, and third center conductors that intersect, a magnet disposed on the center conductor, a first yoke disposed to cover the upper surface of the magnet, and a lower surface side of the ferrite member A second yoke which forms a magnetic closed circuit with the first yoke, and a plurality of capacitors connected to the center conductor, and a bottom plate of the second yoke has a strip-shaped insulating material And an insulating base provided with a plurality of terminal members is mounted, and the terminal member is disposed in a non-conductive state with the second yoke by a relief portion provided in the second yoke, The capacitor is on the insulating substrate. Is location, the first electrode of the capacitor is connected to the terminal member, the second electrode of the capacitor was connected to each said second yoke.

As a second solution, the insulating base is formed of a synthetic resin molded product, and the terminal member is provided on a metal plate embedded in the insulating base or on the outer surface of the insulating base. It was set as the structure formed with the conductive pattern.
As a third solution, the terminal member is provided on the upper surface of the insulating base, connected to the first electrode, and connected to the connecting portion and provided on the lower surface of the insulating base. And a terminal portion provided.

Further, as a fourth solving means, a convex portion located in the relief portion including a hole provided in the bottom plate is provided at a lower portion of the insulating base, and the terminal portion provided on a lower surface of the convex portion. Is configured to be flush with the lower surface of the bottom plate.
Further, as a fifth solving means, the hole which is the convex portion and the relief portion is configured such that the insulating base is positioned with respect to the bottom plate by fitting the tapered portions.

  As a sixth solution, the second yoke has the bottom plate and a side plate bent from the bottom plate. An insulating resist portion and an insulating resist are provided on the bottom plate or the outer surface of the side plate. A terminal located in the portion is provided, and the terminal is formed in a terminal region surrounded by the insulating resist portion.

The nonreciprocal circuit device of the present invention includes a flat ferrite member and first and second portions that are located on the ferrite member and are provided on different surfaces in the vertical direction across the dielectric, and partially cross in the vertical direction. Second and third center conductors, a magnet disposed on the center conductor, a first yoke disposed to cover the upper surface of the magnet, and a lower surface side of the ferrite member, A second yoke that forms a magnetic closed circuit with the yoke, and a plurality of capacitors connected to the central conductor; the bottom plate of the second yoke is made of a strip-shaped insulating material, and a plurality of terminal members are provided And the terminal member is placed in a non-conducting state with the second yoke by a relief portion provided in the second yoke, and the capacitor is placed on the insulating substrate. The first electrode of the capacitor is connected to the terminal member Both were configured to the second electrode of the capacitor is connected to the second yoke.
That is, since the insulating base provided with the terminal member is placed on the bottom plate of the second yoke, the conventional configuration of insert molding the second yoke into the resin case becomes unnecessary, and the productivity is improved. It is good and inexpensive, and since the first electrode of the capacitor is connected to the terminal member provided on the insulating base, the number of parts is small, the productivity is good, and the inexpensive one can be obtained.

  In addition, the insulating base is formed of a synthetic resin molded product, and the terminal member is formed of a metal plate embedded in the insulating base or a conductive pattern provided on the outer surface of the insulating base. An inexpensive product can be obtained that can be formed with a simple structure.

  The terminal member is provided on the upper surface of the insulating base and has a connection portion connected to the first electrode and a terminal portion connected to the connection portion and provided on the lower surface of the insulating base. It is easy to connect to the terminal member, and it is easy to connect the terminal portion, which is a part of the second yoke, to the external device.

  In addition, the lower portion of the insulating base is provided with a convex portion located in the relief portion made of a hole provided in the bottom plate, and the terminal portion provided on the lower surface of the convex portion is flush with the lower surface of the bottom plate. The positioning of the insulating base to the bottom plate is easy, and a different one such as surface mounting of the terminal portion can be obtained.

  In addition, since the holes serving as the convex portions and the relief portions are positioned with respect to the bottom plate by fitting the tapered portions, it is possible to obtain a reliable positioning of the insulating substrate with respect to the bottom plate.

  The second yoke has a bottom plate and a side plate bent from the bottom plate. The bottom plate or the outer surface of the side plate is provided with an insulating resist portion and a terminal located in the insulating resist portion. Since the second yoke for forming the terminal is not necessary, the productivity is improved, and the terminal region is formed by the insulating resist portion. For this reason, solder does not adhere to the outside of the terminal region, and a soldered product can be obtained.

  Referring to the drawings of the non-reciprocal circuit device of the present invention, FIG. 1 is a cross-sectional view of the main part of the first embodiment of the non-reciprocal circuit device of the present invention, and FIG. 2 is the first embodiment of the non-reciprocal circuit device of the present invention. FIG. 3 is a cross-sectional view taken along the line 3-3 in FIG. 2, and FIG. 4 is a bottom view of the first embodiment of the non-reciprocal circuit device of the present invention. FIG.

  5 is a perspective view of the nonreciprocal circuit device according to the first embodiment of the present invention. FIG. 6 is a perspective view of the nonreciprocal circuit device according to the first embodiment of the present invention. FIG. 7 is a perspective view of the non-reciprocal circuit device according to the first embodiment of the present invention. FIG. 8 is a perspective view of the non-reciprocal circuit device according to the first embodiment of the present invention. 9 is a developed view of the central conductor, FIG. 9 is a cross-sectional view of the main part according to the second embodiment of the non-reciprocal circuit element of the present invention, and FIG. 10 is a cross-sectional view of the main part according to the third embodiment of the non-reciprocal circuit element of the present invention. is there.

  Next, the configuration when the first embodiment of the nonreciprocal circuit device of the present invention is applied to an isolator will be described with reference to FIGS. 1 to 8. From a U-shaped or box-shaped magnetic plate (iron plate or the like). The first yoke 1 includes a square (quadrangle) upper plate 1a and a side plate 1b bent downward from a side of the upper plate 1a.

  The rectangular (rectangular) magnet 2 is positioned in the first yoke 1, and the upper surface thereof is in contact with the inner surface of the upper plate 1a. It is attached.

  The second yoke 3 made of a U-shaped or box-shaped magnetic plate (iron plate or the like) includes a rectangular bottom plate 3a, a side plate 3b bent upward from the side of the bottom plate 3a, and the bottom plate 3a to the side plate 3b. And a tapered portion 3d provided on the end surface of the relief portion 3c.

Further, as shown in FIGS. 4 and 5 in particular, an insulating resist portion 15 made of an insulating film is provided on the outer surface of the bottom plate 3a of the second yoke 3, and a terminal 3e located in the insulating resist portion 15 is provided. The terminal 3 e is formed in a terminal region surrounded by the insulating resist portion 15.
In the second yoke 3, the side plate 3b is coupled to the side plate 1b of the first yoke 1 in a state where the bottom plate 3a is disposed facing the upper plate 1a, thereby forming a magnetic closed circuit. .

  In addition, although the terminal 3e in the said Example demonstrated the thing provided in the bottom plate 3a, the terminal 3e may be provided in the side board 3b, or the thing provided ranging over the bottom board 3a and the side board 3b.

  A flat ferrite member 4 made of YIG (Yttrium iron garnet) or the like is disposed between the magnet 2 and the bottom plate 3 a in the second yoke 3. As shown in FIG. 8, the first, second, and third center conductors 5, 6, and 7 made of a thin conductive plate such as copper are formed by punching a metal plate, and have a square ground located in the center. The first, second, and third port portions 5a are formed on the ends of the first, second, and third central conductors 5, 6, and 7, respectively. 6a and 7a are provided.

  In these first, second, and third center conductors 5, 6, and 7, first, the grounding portion 8 is disposed on the lower surface of the ferrite member 4, and in this state, the first, second, third The center conductors 5, 6, and 7 are bent along the side surface and the upper surface of the ferrite member 4.

  At this time, the first, second, and third central conductors 5, 6, and 7 are provided at intervals of 120 degrees on different surfaces in the vertical direction with a dielectric (not shown) interposed therebetween, and are arranged in the vertical direction. As shown in FIG. 2, the first and second port portions 5a and 6a are arranged on one long side of the ferrite member 4, and the third port portion 7a is in a state of being arranged on the other long side.

A strip-shaped insulating base 9 made of a synthetic resin molding or the like includes a strip-shaped plate-like portion 9a, a pair of convex portions 9b projecting downward from the lower surfaces of both end portions of the plate-like portion 9a, and the convex portions 9b. It has the taper part 9c provided in the side surface which opposes.
The insulating base 9 may be a convex portion 9b without a tapered portion 9c.

  The plurality of terminal members 16 made of a conductive pattern are provided on the insulating base 9, and are provided on the lower surface of the connecting portion 16a provided on the surface of the plate-like portion 9a and the convex portion 9b which is the lower portion of the plate-like portion 9a. The terminal part 16b and the conductor part 16c which is provided in the end surface of the plate-shaped part 9a and connects the connection part 16a and the terminal part 16b are provided.

  In addition, although the terminal member 16 of the said Example demonstrated by what was formed with the conductive pattern, the terminal member 16 was formed with the metal plate, and the terminal member 16 which consists of this metal plate may be embed | buried under the insulating base | substrate. .

In this insulating base 9, the lower portion of the plate-like portion 9a is placed on the bottom plate 3a of the second yoke 3, the convex portion 9b is fitted into the escape portion 3c, and the tapered portions 3d and 9c are connected to each other. The second yoke 3 is attached by abutting and fitting.
At this time, the terminal member 16 is in a non-conductive state with the second yoke 3, and the terminal portion 16b is flush with the lower surface of the bottom plate 3a.

  The ferrite member 4 to which the first, second, and third central conductors 5, 6, and 7 are attached is disposed in a state of being positioned in the first recess 9c, and the ferrite member 4 is disposed in the first recess 9c. When arranged inside, the ground portion 8 located on the lower surface of the ferrite member 4 comes into contact with the bottom plate 3a and is grounded.

  The chip-type first, second, and third capacitors C1, C2, and C3 are respectively opposed to the first electrode 11a provided on the insulator 10 and the first electrode 11a across the insulator 10. A second electrode 11b is provided.

The first and second capacitors C1 and C2 are placed on the insulating base 9, the first electrode 11a is connected to the connection portion 16a of the terminal member 16, and the second electrode 11b is connected to the second yoke. 3 side plates 3b are soldered 17 and grounded.
The port portion 5a of the first center conductor 5 is connected to the terminal member 16 and is electrically connected to the first electrode 11a of the first capacitor C1, and the port portion 6a of the second center conductor 6 is Are connected to the terminal member 16 and are electrically connected to the first electrode 11a of the second capacitor C2.

  In the third capacitor C3, the second electrode 11b is connected to the bottom plate 3a of the second yoke 3, and the port portion 7a of the third central conductor 7 is connected to the first electrode 11a. It is in the state.

  The chip-type resistor R has a pair of electrodes 12a and 12b provided on opposite end faces, and the resistor R has a third center with one electrode 12a insulated from the bottom plate 3a. The port portion 7a of the conductor 7 is connected to the electrode 12a, and the other electrode 12b is connected to the bottom plate 3a and grounded.

With such a configuration, the nonreciprocal circuit element of the present invention made of an isolator is formed. The nonreciprocal circuit element of the present invention is incorporated in a surface mount on a circuit board of an external device, although not shown here. It is like that.
In other words, the terminal 3e provided on the bottom plate 3a of the second yoke 3 and the terminal portion 16b of the terminal member 16 provided on the insulating base 9 are placed on the circuit board of the external device. It is designed to be soldered to the wiring pattern.

In the above embodiment, the terminal 3e provided on the lower surface of the bottom plate 3a of the second yoke 3 and the terminal portion 16b provided on the lower portion of the insulating base 9 are connected to an external device. However, the second yoke The terminal 3e provided on the third side plate 3b and the conductor 16c provided on the end face of the insulating base 9 may be connected to an external device as the terminal 16b.
Moreover, although the said Example was demonstrated as what was applied to the isolator, you may apply to the circulator which eliminated the resistor R.

  FIG. 9 shows a second embodiment of the non-reciprocal circuit device according to the present invention. In the second embodiment, tapered portions 9c are provided on both sides of the plate-like portion 9a and the convex portion 9b of the insulating base 9, The tapered portion 9c is engaged with a tapered portion 3d provided on the escape portion 3c of the bottom plate 3a.

Other configurations are the same as those of the first embodiment, and the same parts are denoted by the same reference numerals, and the description thereof is omitted here.
In the second embodiment, the convex portion 9b is provided at both ends of the plate-like portion 9a. However, the convex portion 9c is provided over the entire lower portion of the plate-like portion 9a, and the bottom plate 3a is provided with the bottom plate 3a. Alternatively, a relief portion 3c formed of a slit-like hole may be provided, and the tapered portion 9c of the insulating base 9 may be engaged with the tapered portion 3d provided on the relief portion 3c of the bottom plate 3a.

  FIG. 10 shows a third embodiment of the non-reciprocal circuit device of the present invention. This third embodiment has a configuration in which the convex portion 9b of the insulating base 9 is eliminated and the insulating base 9 is composed only of the plate-like portion 9a. It is a thing.

  Other configurations are the same as those of the first embodiment, and the same parts are denoted by the same reference numerals, and the description thereof is omitted here.

The principal part sectional drawing which concerns on 1st Example of the nonreciprocal circuit device of this invention. The top view which concerns on 1st Example of the nonreciprocal circuit device of this invention, and shows the state which removed the 1st yoke and the magnet. Sectional drawing in the 3-3 line of FIG. The bottom view which concerns on 1st Example of the nonreciprocal circuit device of this invention. The perspective view of the state which turned over the 2nd yoke according to 1st Example of the nonreciprocal circuit device of this invention. The perspective view of the insulation base | substrate which concerns on 1st Example of the nonreciprocal circuit device of this invention. The perspective view of the state which turned over the insulating base | substrate according to 1st Example of the nonreciprocal circuit device of this invention. The expanded view of the center conductor which concerns on 1st Example of the nonreciprocal circuit device of this invention. Sectional drawing of the principal part which concerns on 2nd Example of the nonreciprocal circuit device of this invention. Sectional drawing of the principal part which concerns on 3rd Example of the nonreciprocal circuit device of this invention. The disassembled perspective view of the conventional nonreciprocal circuit device.

Explanation of symbols

1: First yoke 1a: Top plate 1b: Side plate 2: Magnet 3: Second yoke 3a: Bottom plate 3b: Side plate 3c: Escape portion 3d: Tapered portion 3e: Terminal 4: Ferrite member 5: First central conductor 5a: 1st port part 6: 2nd center conductor 6a: 2nd port part 7: 3rd center conductor 7a: 3rd port part 8: Grounding part 9: Insulation base 9a: Plate-like part 9b: Convex part 9c: Tapered part C1: First capacitor C2: Second capacitor C3: Third capacitor 10: Insulator 11a: First electrode 11b: Second electrode R: Resistor 12a: Electrode 12b: Electrode 15: Insulation resist part 16: Terminal member 16a: Connection part 16b: Terminal part 16c: Conductor part 17: Solder

Claims (6)

A flat ferrite member and first, second, and third central conductors that are located on the ferrite member and are provided on different surfaces in the vertical direction across the dielectric, and partially intersect in the vertical direction; The magnet disposed on the central conductor, the first yoke disposed so as to cover the upper surface of the magnet, and the lower surface of the ferrite member, and the first yoke forms a magnetic closed circuit. A second yoke constituting the plurality of capacitors, and a plurality of capacitors connected to the central conductor, and an insulating substrate made of a strip-shaped insulating material and provided with a plurality of terminal members is mounted on the bottom plate of the second yoke. And the terminal member is disposed in a non-conductive state with the second yoke by a relief portion provided in the second yoke, and the capacitor is placed on the insulating base, A first electrode of the capacitor is connected to the end; Is connected to the member, the non-reciprocal circuit element in which the second electrode of the capacitor, characterized in that connected to the second yoke. The insulating base is formed of a synthetic resin molded product, and the terminal member is formed of a metal plate embedded in the insulating base or a conductive pattern provided on the outer surface of the insulating base. The nonreciprocal circuit device according to claim 1. The terminal member has a connection portion provided on the upper surface of the insulating base and connected to the first electrode, and a terminal portion connected to the connection portion and provided on the lower surface of the insulating base. The nonreciprocal circuit device according to claim 1, wherein: At the lower part of the insulating base, a convex part is provided in the relief part composed of a hole provided in the bottom plate, and the terminal part provided on the lower surface of the convex part is flush with the lower surface of the bottom plate. The non-reciprocal circuit device according to claim 3, wherein 5. The nonreciprocal circuit device according to claim 4, wherein the hole serving as the convex portion and the relief portion positions the insulating base with respect to the bottom plate by fitting between tapered portions. The second yoke has the bottom plate and a side plate bent from the bottom plate, and an outer surface of the bottom plate or the side plate is provided with an insulating resist portion and a terminal located in the insulating resist portion. 6. The nonreciprocal circuit device according to claim 1, wherein the terminal is formed in a terminal region surrounded by the insulating resist portion.

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