JP2001292007A - Irreversible circuit element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an irreversible circuit element with enhanced reliability that can easily be assembled. SOLUTION: The irreversible circuit element that is provided with an assembly having a permanent magnet, a center conductor and a magnetic body between an upper yoke and a lower yoke, with an elastic resin member and with a resin case on which at least a capacitor and the assembly are placed or with a dielectric board on which capacitors are layered, is characterized in that a sidewall of the lower yoke has an opening, a sidewall of the upper yoke has a projection inserted to the opening, the upper and lower yokes are locked by the projection and the opening and the elastic resin member is placed while being elastically deformed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-reciprocal circuit device having an irreversible transmission characteristic with respect to a high-frequency signal, and more particularly to a non-reciprocal circuit device used in a mobile communication system such as a mobile phone. The present invention relates to a non-reciprocal circuit device called a curator.

[0002]

2. Description of the Related Art Hitherto, non-reciprocal circuit devices such as isolators and circulators have been known as one of transmission / reception circuit components used in a microwave band and a UHF band for mobile phones, automobile phones and the like. In general, isolators and circulators are used for the purpose of preventing breakage of an amplifier, and have a function of reducing insertion loss in a signal transmission direction and increasing reverse loss in a reverse direction. Hereinafter, in the specification of the present application, an isolator among non-reciprocal circuit devices will be described as an example.

FIG. 7 is an exploded perspective view showing an example of an isolator. This isolator includes an upper yoke 1, a magnet 2, an assembly 20, plate capacitors 8, 9, 10, and a dummy resistor 1.
1, a resin case 7, and a lower yoke 12.
In the assembly 20, the ferrite disk 3 is disposed on a conductive plate having a structure in which three center conductors 4, 5, and 6 project radially from a disk-shaped shield plate, and the three center conductors 4, 5, and 6 are insulated. It is constructed by folding in a state and overlapping.

The resin case 7 has a structure in which a conductor plate of about 0.1 mm and an engineering plastic having heat resistance are integrally formed, and has a circular concave portion 13a in the center of which an assembly 20 is disposed. Concave portions 13b, 13c, 13 around which plate capacitors and dummy resistors are arranged
d. The bottom of these recesses 13b, 13c, 13d and the recess 13a in which the assembly 20 is arranged, the input / output port 1
The connection electrodes 6b and 16c are formed of the conductor plates. External terminals 15a, 15b, 15c, 15d, 15e, 15
f is formed. The concave portion 13b of this resin case 7,
Plate capacitors 8, 9, and 10 having electrodes formed on the upper and lower surfaces are inserted into 13c and 13d, respectively, and the electrodes on the lower surface and the connection electrodes 14a formed on the bottom of the recess are connected by soldering. Further, the dummy resistor 11 is disposed in the recess 13b,
One of the electrodes is connected to the connection electrode 14a by soldering.

[0005] Next, the above-described assembly 20 is disposed in the recess 13 a of the resin case 7. At this time, the disk-shaped shield plate of the central conductor is soldered to the connection electrode 14a. Thereby, one end of the center conductor is grounded. One end of the center conductor 4 is connected to an electrode on the upper surface of the plate capacitor 8 and one terminal electrode of the dummy resistor 11. One end of the center conductor 5 is connected to an electrode on the upper surface of the plate capacitor 9 and the input / output port 16b. One end of the center conductor 6 is connected to an electrode on the upper surface of the plate capacitor 10 and the input / output port 16c.

Then, the resin case 7 is arranged on the lower yoke 12. The lower yoke 12 has a structure that matches the concave portion 18 at the bottom of the resin case 7, and the lower yoke 12 and the back surface of the connection electrode 14a are connected by soldering. The connection between the lower yoke 12 and the resin case 7, the connection between the resin case 7 and the assembly 20, and the connection between the plate capacitors 8, 9 and 10 and the input / output ports 16 b and 16 c are performed, for example, by cream soldering at a predetermined position. Is applied and then soldered in a reflow furnace. At this time, each component is mechanically fixed with a holding jig or the like in advance so that the connection between each component can be performed reliably. Generally, soldering is performed.

After soldering between the components, the protrusion 100 on the side wall of the upper yoke 1 to which the magnet 2 is fixed is attached to the lower yoke 1
2 is inserted into the notch 101, the upper yoke 1 is turned around the corresponding portion as a fulcrum, and the protrusion 10 formed on the other side wall is rotated.
0 and the notch 101 are fitted together to form an isolator (first conventional example). In addition, the above dummy resistance is eliminated,
If it is the same as other center conductors, it will be a circulator. In some cases, the assembly 20 has a laminated structure as shown in FIG. 6, or the capacitive element is laminated on a laminated substrate.

As another example, Japanese Utility Model Application Laid-Open No. 3-10500
No. 8 discloses a non-reciprocal circuit device. In this non-reciprocal circuit device, a concave portion is formed by cutting a side wall of the lower yoke, and an engaging claw portion is formed at an edge of the concave portion to be fitted with a resin pressing member disposed on the dielectric substrate of the lower yoke. Then, while pressing the dielectric substrate to obtain connection with the lead-out portion of the center conductor, a slit is formed in the side wall of the lower yoke, an engaging hole is formed at the tip end thereof, and the engaging hole is formed in the upper yoke. The projections are engaged with each other, and a jig for assembling each component element is unnecessary. (Second conventional example)

[0009] As another example, Japanese Patent Application Laid-Open No. 9-32660 is disclosed.
No. 4 discloses a non-reciprocal circuit device. In this non-reciprocal circuit device, a magnetic assembly and a pressing member for electrically and mechanically fixing the resin substrates to each other are disposed in a magnetic circuit configured by disposing permanent magnets between upper and lower yokes. .
(Third conventional example)

[0010]

In the case of the first conventional example, it is necessary to hold a non-reciprocal circuit element before reflow soldering with a jig in a semi-finished state, which complicates assembly and requires a large number of man-hours for manufacturing. Is required. It also makes automation difficult to improve productivity. Further, the jig is used repeatedly, but there is a problem in its durability. Further, in the case of the second conventional example, the engaging claw formed on the side wall of the lower yoke is fitted to a resin pressing member arranged on the dielectric substrate of the lower yoke. Although there is no specific disclosure of the resin pressing member, it is naturally necessary to form the resin pressing member with a highly rigid resin material in consideration of fitting with the lower yoke. In such a case, it is necessary to uniformly form the resin pressing member without deformation in order to uniformly apply the pressing force to one surface of the dielectric substrate. There is a problem that the pressing force to be applied tends to be local, and the connection of each component element is uncertain. Further, after the lower yoke and the resin pressing member are fitted, the upper and lower cases are further fitted. This complicates assembly and requires a large number of man-hours for manufacturing. Also the third
In the case of the conventional example, the pressing member is formed by integrally forming the main body and the three arms with a liquid crystal polymer or the like, and the upper and lower yokes are fitted and the pressing member is elastically deformed by the permanent magnet to form the magnetic assembly. Is electrically and mechanically pressed and fixed to the resin substrate, but no means for fitting the upper and lower yokes is disclosed. In this case, solder the upper and lower yokes in advance, or
Unless a jig for fixing the upper and lower yokes is used, it is difficult to arrange the pressing member by elastically deforming it. Therefore, even in this case, assembling is complicated and a large number of man-hours are required for manufacturing.

An object of the present invention is to solve the above problems,
It eliminates the need for holding jigs in soldering, improves workability and productivity during manufacturing, prevents misalignment and lifting of each component element, improves connection reliability, and improves assembly. An object is to provide an easy non-reciprocal circuit device.

[0012]

According to a first aspect of the present invention, there is provided an assembly having a permanent magnet, a center conductor and a magnetic material between an upper yoke and a lower yoke, an elastic resin member, at least a capacitor and the assembly. A non-reciprocal circuit device including a resin case for disposing the capacitor and at least a dielectric substrate for laminating the capacitor, wherein the lower yoke has an opening on a side wall, and the upper yoke has a side wall on the side wall. A non-reciprocal circuit device comprising a projection fitted into a hole, an upper and lower yoke locked by the projection and the opening, and the elastic resin member elastically deformed and arranged. According to a second aspect of the present invention, there is provided a nonreciprocal circuit device including a permanent magnet and a dielectric substrate on which at least a center conductor and a capacitor are stacked and arranged between an upper yoke and a lower yoke, wherein an opening is formed in a side wall of the lower yoke. The upper yoke has a projection on the side wall thereof, and the upper and lower yokes are locked by the projection and the aperture, and the elastic resin member is elastically deformed and arranged. It is a non-reciprocal circuit device. In the present invention, the upper yoke and the lower yoke are mechanically integrated by the elasticity of the elastic resin member, and furthermore, the member disposed between the upper and lower yokes can be mechanically fixed. Further, in the present invention, it is preferable that the outer wall surface of the upper yoke slides on the inner wall surface of the lower yoke so that the upper yoke and the lower yoke are fitted. Preferably, the protrusion of the upper yoke is formed integrally with the upper yoke and protrudes from the outer wall surface, and more preferably, the protrusion of the upper yoke is formed in a tapered shape from the lower edge of the upper yoke side wall. It is. It is also preferable to provide a cut surface on the inner wall surface side of the upper edge of the lower yoke side wall where the opening is formed. Further, an R portion may be provided at the upper edge corner of the lower yoke side wall where the opening is formed.
Further, in the present invention, the upper yoke and the lower yoke are slid and fitted in the thickness direction, but a receiving portion is provided by cutting out a part of the width direction end of the lower yoke side wall in which the opening is formed, It is also preferable that the upper yoke and the lower yoke are mechanically restrained from sliding in the thickness direction by being brought into contact with the lower end of the other side wall having no projection on the upper yoke. Further, in the present invention, it is preferable that the elastic resin member is formed in a substantially plate shape, and at least a part of the peripheral edge portion is provided with a convex portion. The elastic resin member is JIS K
Preferably, the resin material has an international rubber hardness of 10 to 100 specified in 6250.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 A non-reciprocal circuit device according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is an exploded perspective view showing the overall configuration of an isolator according to the present invention, and FIG. 2 is a plan view (a) and a sectional view (b) of a non-reciprocal circuit device according to one embodiment of the present invention. As shown in FIG. 1, an isolator according to the present invention includes an assembly 20 including a permanent magnet 2, a center conductor and a magnetic material between an upper yoke 1 and a lower yoke 12, and an assembly 20 and an elastic resin member 50 (silicon resin). The lower yoke 12 has openings 200, 201, 202, and 20 on the side wall of the lower yoke 12.
3 and the opening 20 is provided on the side wall of the upper yoke 1.
0, 201, 202, 203
205, 206, 207 (206, 207 not shown)
Are formed, and the upper and lower yokes are fitted to each other. At this time, the elastic resin member 50 is in a state of being elastically deformed in the thickness direction. The elastic resin member 50 is locked by the projection and the opening, and presses each component element as shown in FIG. A force is applied in the thickness direction. With this configuration, misalignment and lifting of the components are prevented, and the reliability of the connection is improved. The opening of the lower case does not necessarily have to be a through-hole, but may have a shape such that the projection of the upper case can be fitted therein, and may be, for example, a recess. Further, the elastic resin member 50 may be bonded and pasted to the permanent magnet 2 in advance. With such a configuration, handling of the relatively soft elastic resin member 50 at the time of assembly is facilitated. Further, in this case, the permanent magnet 2 and the elastic resin member 50 may be in a state of being bonded and attached at the time of assembly, and the upper and lower yokes may be separated after locking. Therefore, it is not particularly necessary to select an adhesive or the like to be used for bonding and bonding. However, considering soldering in a reflow furnace, it is preferable to use an acrylic or epoxy heat-resistant adhesive.

The upper and lower yokes are, for example, SPCC, 42
It is composed of at least one metal material selected from alloys and Fe-Co alloys. These metal materials are previously cold-rolled or hot-rolled to about 100 to 300 μm, and further have a metal or alloy containing at least one of silver, copper, gold, and aluminum on the surface thereof and a metal having high conductivity. A film is formed. As the metal material, 42
The use of an alloy is preferable because of its excellent oxidation resistance. Since the upper and lower yokes are used as part of a magnetic circuit, it is desirable to use SPCC or an Fe-Co alloy having excellent magnetic properties. And Co: 49 and V:
2, C: ≤ 0.015, Si: ≤ 0.10, Mn: ≤
0.15, an alloy consisting of the balance Fe and unavoidable impurities.

Further, the sheet material made of the metal material is placed in a mold of a press machine, and is punched into a predetermined shape.
The upper and lower yokes used in the present invention are drawn, cut, and bent. The lower yoke 12 has openings 200 to 203 on its side wall and cut surfaces 400 and 401 at the end of the side wall, and the upper yoke 1 has tapered projections 204 to 207 from the lower end of the side wall. Are integrally formed by drawing. Further, by forming an R portion at the upper edge corner of the lower yoke side wall where the opening is formed, as shown in the explanatory view of the upper and lower yoke fitting state in FIGS. The inner wall surface of the yoke 12 is used as a guide surface, and when the upper and lower yokes are slid and fitted to each other, they can easily enter each other. The cut surface is C0.
It is preferably from 0.5 to 0.2. Also, the R portion is R0.1 ~
0.5 is preferred. Further, the lower yoke is provided with a receiving portion 300 by cutting off a part of the width direction end of the side wall where the opening is formed, and the lower end 3 of the other side wall having no projection of the upper yoke.
01 to restrict the sliding of the upper yoke and the lower yoke in the thickness direction. With this configuration, it is possible to prevent deformation, destruction, and the like due to excessive force acting on each component disposed between the upper and lower cases during assembly.

A cream solder is applied to the inner bottom surface of the lower yoke 12 formed as described above, and the resin case 12 is disposed from above. The resin case 7 has a rectangular frame-shaped box-shaped structure, and has a circular concave portion 13a for the assembly 20 at the center thereof, and concave portions 13b, 13c, 13d for the capacitive element and the resistive element around the concave portion. Having. The recesses 13b, 1
Connection electrodes are formed on the bottoms of 3c and 13d and the recess 13a for the assembly 20. Since the resin case 7 has the same basic structure as the resin case used in the above-mentioned conventional isolator, detailed description is omitted. A cream solder is applied to the recess formed in the resin case 7, and the assembly is disposed in the recess 13a for the assembly.
Plate capacitors 8 and 9 are arranged in 13c, and a plate capacitor 10 and a dummy resistor 11 are arranged in the recess 13d. The lower electrode of each capacitor and the electrode on one end of the dummy resistor are connected to the ground. It is configured to: Further, cream solder is applied to the upper surface electrode of each of the capacitors, and is connected to each of the center electrodes 4, 5, and 6.

An elastic resin member 50 is provided on the upper surface of the assembly 20. The elastic resin member 50 is made of, for example, heat-resistant and insulating silicone rubber.
Its shape is substantially plate-like, and the recess 13 of the resin case is formed.
The projections are formed at portions facing b, 13c, and 13d. The elastic resin member is made of JIS K62
Preferably, the resin material has an international rubber hardness of 10 to 100 specified by 50. International rubber hardness less than 10,
If it exceeds 100, a desired elastic force sufficient to mechanically and integrally fix the upper yoke and the lower yoke and / or the upper yoke and the permanent magnet and / or the lower yoke and the resin case cannot be obtained, which is not preferable. Further, a rectangular permanent magnet 2 is disposed on the elastic resin member 50, and the upper yoke 1
And the upper yoke was engaged with the projection of the upper yoke fitted into the opening of the lower case and the elastic resin member 50 was elastically deformed. With this configuration, the permanent magnet 2 and the upper yoke 1, the assembly 20 and the resin case 7, the resin case 7 and the lower yoke 12 are mechanically fixed, and the central conductor 4 is formed by the convex portion of the elastic resin member. , 5, 6 and the plate capacitors 8, 9, 10 and the dummy resistor 11 are pressed and fixed. Further, in this state, the isolator according to the present invention was manufactured by reflow soldering in a high temperature atmosphere.

(Embodiment 2) Another embodiment of the present invention will be described. FIG. 4 is an exploded perspective view showing the overall configuration of the isolator according to the present invention. This isolator has many parts in common with the first embodiment, and the following mainly describes the different parts. The isolator according to the present embodiment is configured by stacking the flat plate capacitors arranged in the resin case in the first embodiment on the dielectric substrate. This laminated substrate is provided with a rectangular through hole in which the assembly is disposed at the center. This dielectric substrate 40
0 is placed in the lower case 12, and the assembly 20 is inserted into the through hole.
Are arranged, and cream solder is applied to the upper surface electrode of the capacitor pattern on the dielectric substrate 400 so as to be connected to the respective center electrodes 4, 5, and 6. Then, an elastic resin member 50 is provided on the upper surface side of the assembly 20. The elastic resin member 50 has a configuration in which a convex portion is formed at a portion in contact with the ends of the center electrodes 4, 5, and 6, as in the first embodiment. Further, the rectangular permanent magnet 2 is disposed on the elastic resin member 50, the upper yoke 1 is pushed into the lower yoke 12, and the projection of the upper yoke is fitted into the opening of the lower case. In an elastically deformed state, the upper and lower cases are locked, and the permanent magnet 2 and the upper yoke 1, the assembly 20 and the lower case 12, the dielectric substrate 40
0 and the lower yoke 12 are mechanically fixed, and the central conductors 4, 5, and 6 are pressed and fixed by the convex portions of the elastic resin member. Further, in this state, the isolator according to the present invention was manufactured by reflow soldering in a high temperature atmosphere. Further, the assembly 20 may be configured by laminating a center conductor in a magnetic body as shown in FIG.

(Embodiment 3) Another embodiment of the present invention will be described. FIG. 5 is an exploded perspective view showing the overall configuration of the isolator according to the present invention. This isolator has many parts common to the first and second embodiments, and the following description will focus on the differences. The isolator according to the present embodiment is configured by stacking and arranging a capacitive element on a dielectric substrate in the same manner as in the second embodiment, printing and forming the center conductors 3, 4, and 5, and providing a part of the center conductor in the dielectric substrate. I have. The magnetic body 3 is disposed in the lower case 12, and the dielectric substrate 400 is disposed thereon. And the dielectric substrate 4
An elastic resin member 50 is disposed on the upper surface side of the elastic member 50, and a rectangular permanent magnet 2 is disposed on the elastic resin member 50, the upper yoke 1 is pushed into the lower yoke 12, and the projection of the upper yoke is fixed to the lower case. The elastic resin member 50 is elastically deformed and the upper and lower cases are locked, and the permanent magnet 2, the upper yoke 1, and the dielectric substrate 4
00 and the lower yoke 12 are mechanically fixed. Further, in this state, the isolator according to the present invention was manufactured by reflow soldering in a high temperature atmosphere.

[0020]

As described above, since the upper and lower yokes are locked and the respective components are mechanically pressed and fixed by disposing the elastic resin member in the upper and lower yokes in an elastically deformed state, the soldering is performed. Even before reflow, each component can be maintained at an appropriate interval and position. For this reason, the soldering process can be performed through a reflow furnace in a state where the intervals, positions, and the like of the respective components are appropriately maintained, and a holding jig is not required. As a result, it is possible to save labor for mounting the holding jig, and to improve workability. In addition, it is possible to prevent misalignment or lifting of each component element, and to obtain a non-reciprocal circuit element with improved connection reliability and easy assembly.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an entire configuration of a non-reciprocal circuit device according to one embodiment of the present invention.

2A is a plan view of a non-reciprocal circuit device according to one embodiment of the present invention, and FIG. 2B is a cross-sectional view of the non-reciprocal circuit device according to one embodiment of the present invention.

3A is a side view illustrating a fitting state of an upper and lower yoke used in the present invention, and FIG. 3B is a partially enlarged cross-sectional view illustrating a fitting state of an upper and lower yoke used in the present invention.

FIG. 4 is an exploded perspective view showing another entire configuration of the non-reciprocal circuit device according to one embodiment of the present invention.

FIG. 5 is an exploded perspective view showing another entire configuration of the non-reciprocal circuit device according to one embodiment of the present invention.

FIG. 6 is a perspective view showing another embodiment of the assembly.

FIG. 7 is an exploded perspective view showing the entire configuration of a conventional nonreciprocal circuit device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper yoke 2 Magnet 3 Magnetic body 4, 5, 6 Center conductor 7 Resin case 8, 9, 10 Plate capacitor 11 Dummy resistor 12 Lower yoke 50 Elastic resin member

Claims (11)

[Claims] 1. A permanent magnet between an upper yoke and a lower yoke,
An assembly including a center conductor and a magnetic body, an elastic resin member,
A non-reciprocal circuit device including at least a resin case in which the capacitor and the assembly are arranged, or a dielectric substrate in which at least the capacitors are stacked, wherein the lower yoke has an opening in a side wall, and the upper yoke has an opening. The side wall of the yoke is provided with a projection fitted into the opening, the upper and lower yokes are locked by the projection and the opening, and the elastic resin member is elastically deformed and arranged. Circuit element. 2. A permanent magnet between an upper yoke and a lower yoke,
A non-reciprocal circuit device comprising a dielectric substrate on which at least a center conductor and a capacitor are stacked and arranged, wherein an opening is formed in a side wall of the lower yoke, and the opening is fitted in a side wall of the upper yoke. A non-reciprocal circuit element, comprising: a protrusion that engages the upper and lower yokes with the protrusion and the opening, and the elastic resin member is disposed by being elastically deformed. 3. The non-reciprocal circuit device according to claim 1, wherein a member disposed between the upper and lower yokes is mechanically fixed by the elasticity of the elastic resin member. 4. The non-reciprocal circuit according to claim 1, wherein the upper yoke and the lower yoke are fitted by sliding the outer wall surface of the upper yoke and the inner wall surface of the lower yoke. element. 5. The non-reciprocal circuit device according to claim 6, wherein the protrusion of the upper yoke is formed integrally with the upper yoke and protrudes from an outer wall surface. 6. The non-reciprocal circuit device according to claim 5, wherein the protrusion of the upper yoke is formed in a tapered shape from a lower edge of a side wall of the upper yoke. 7. The nonreciprocal circuit device according to claim 4, wherein a cut surface is provided on an inner wall surface side of an upper edge portion of the lower yoke side wall in which the opening is formed. 8. The non-reciprocal circuit device according to claim 4, wherein an R portion is provided at an upper edge corner of the lower yoke side wall where the opening is formed. 9. A receiving portion is provided by cutting out a part of an end portion in a width direction of a lower yoke side wall in which an opening is formed, and abuts on a lower end portion of another side wall having no projection of the upper yoke. 9. The non-reciprocal circuit device according to claim 4, wherein the sliding of the upper yoke and the lower yoke in the thickness direction is restricted. 10. The non-reciprocal circuit device according to claim 1, wherein the elastic resin member is substantially plate-shaped, and has a convex portion on at least a part of a peripheral portion. 11. The elastic resin member is made of JIS K 6250.
The non-reciprocal circuit device according to any one of claims 1 to 3, wherein the resin material has an international rubber hardness of 10 to 100 as defined in