JP5472709B2 - Surface mount type nonreciprocal circuit device - Google Patents

Description

  The present invention relates to the structure of non-reciprocal elements such as isolators and circulators that are employed as high-frequency components in the microwave band of automobile phones, mobile phones, and the like.

  Non-reciprocal circuit elements such as isolators and circulators have a function of passing high-frequency signals only in the transmission direction and preventing transmission in the reverse direction. For example, an isolator is mounted on a motherboard together with a power amplifier and the like, and is an important microwave circuit component used to prevent instability of operation of the power amplifier due to a reflected wave caused by mismatching of the microwave circuit, and to prevent destruction.

  The nonreciprocal circuit element has a port portion used for connection of an input terminal, an output terminal, a dummy resistor, and the like. It is mounted on the motherboard together with a power amplifier as a microwave circuit component. In this case, the soldering of the nonreciprocal circuit element to the motherboard is achieved by significantly mounting productivity by mechanically mounting the nonreciprocal circuit element supplied in a tape-and-reel format with a mounter. Improvements are being made.

  In many cases, the port portion is usually formed of a thin copper plate having a thickness of 0.1 to 0.25 mm. The port portion is bent and soldered to a mounting substrate. However, such a thin copper plate has a problem that it is easily deformed by the action of external force, the terminal is deformed, and a gap is formed between the wiring of the mother board and a soldering failure is likely to occur.

In order to solve such a problem, Patent Document 1 proposes to use a rigid terminal support member and a terminal member provided at an end portion of the terminal support member. FIG. 10 is an external perspective view of the non-reciprocal circuit element, and FIG. 11 is an exploded perspective view showing a configuration of a lower case (storage container in the present invention) and a terminal support member.
Between the upper case 250 and the lower case 201, a permanent magnet, a plate-like ferrite, a central conductor, a ground plate, a terminal support member 501 and the like are disposed so as to overlap each other. The terminal support member 501 includes three arm portions 202 and extends from the side opening of the lower case 201, and a terminal member 502 is disposed on the distal end side of each arm portion 202. FIG. 12 is a cross-sectional view showing the configuration of the terminal member 502. A cylindrical contact lead 301 made of a conductive material and a dielectric material 302 covering the periphery of the body portion are provided, and the dielectric material 302 ensures insulation from the lower case 201 and the terminal support member 501.
The lead portion 401 of the central conductor extends from the side opening to the top side 306 of the cylindrical contact lead 301 of the terminal member 502 and is electrically connected. The bottom side 305 of the cylindrical contact lead 301 is the lower case. 201 is configured to be substantially flush with the bottom surface 24 of 201.

Patent Document 2 discloses that a terminal support member having rigidity is configured as an insulator. FIG. 13 is a perspective view showing an example of a non-reciprocal circuit device using the configuration, and FIG. 14 is an exploded perspective view showing the internal structure. Since the terminal support member 18 is made of a material having high bending strength such as glass epoxy resin or liquid crystal polymer, there is almost no deformation even when an external force is applied. A through hole 19 is provided at the end of the arm of the terminal support member 18, and the terminal member (tab terminal) 5 is formed in the through hole 22 and the through hole 19 formed at the end of the lead portion 20 of the center conductor 40. It is inserted and fixed by soldering. In FIG. 13 and FIG. 14, the same reference numerals are given to the parts common to the non-reciprocal circuit device of the present invention described later.
In any case, by connecting the lead portion of the central conductor to the wiring of the mother board via the terminal member supported by the terminal support member, even if an external force acts on the terminal member, the flatness can be easily broken. And good electrical connection is possible.

JP-A-10-294606 JP 2003-124711 A

However, there are some problems caused by the rigidity of the terminal support member. According to the configuration of the prior art, the flatness of the bottom surface of the lower case and the terminal member can be accurately formed, and deformation after the formation is prevented, but it cannot follow the bending and distortion of the motherboard itself. There's a problem.
The motherboard on which the nonreciprocal circuit element is mounted is attached to the housing by a fixing means such as a screw or an adhesive, and may be bent or distorted at that time. In addition, due to a change with time such as the environmental temperature, the same deformation is likely to occur due to a difference in coefficient of linear expansion between the casing and the motherboard. In the conventional non-reciprocal circuit element against such a deformation, a large stress acts on the terminal portion, and solder, conductive resin, and the like are easily broken at the connection portion. There is a problem in that poor electrical continuity occurs due to a gap between the wiring of the motherboard.

Also, if the board itself is bent or distorted, even if a non-reciprocal circuit element is mounted, a gap will be created between the terminal member and the wiring of the motherboard, and the excellent flatness will be conversely defective. There was a problem of inviting. Although the nonreciprocal circuit element itself may be directly attached to a support member including a housing instead of the motherboard, the influence of the deformation of the support member is the same as that when mounted on the motherboard.
Therefore, an object of the present invention is to provide a surface-mounting non-reciprocal circuit element that is not easily affected by a member on which the non-reciprocal circuit element is mounted and is easily electrically connected to a wiring.

  1st invention arrange | positions a plate-shaped ferrite, a center conductor, and a permanent magnet on a storage container, and arrange | positions it, and the conductive tab terminal connected with the edge part of the lead part of the center conductor extended from the said storage container The lead portion extends radially in three directions at predetermined angular intervals centered on a common conductor portion of a central conductor that is overlapped with the plate-like ferrite, and extends outside the plate-like ferrite. Appears on the edge side, the tip is bent in a plane direction different from the extending direction in the storage container, and the plate ferrite outer edge side becomes the fixed end and can be bent with the tab terminal side as the moving end. This is a surface mount type non-reciprocal circuit device.

The central conductor includes a lead portion extending in three directions from the common conductor portion with the common conductor portion resonating in the TM110 mode as a central portion. A part of the lead portion may be bent in the thickness direction. When a high-frequency current is passed through the center conductor, a high-frequency magnetic field surrounding the center conductor is generated in the plate-shaped ferrite, and a rotating magnetic field is generated in the plate-shaped ferrite by the permanent magnet. Thus, the input high-frequency magnetic field rotates the plane of polarization when passing through the plate-like ferrite, and is output only to a predetermined lead portion, so that the circuit has irreversibility.

  It is preferable to form a linear depression parallel to the extending direction between the outer edge side of the plate-like ferrite of the lead part and the tab terminal side. The yield strength against bending is improved by the depression. The shape, length, or number of the dents is not particularly limited, but it is desirable that the dent is not significantly disturbed while improving the resistance to bending.

Where the central conductor is usually a thin copper plate, it is desirable to use a metal material having spring properties. For example, it is preferably formed from a thin plate made of phosphor bronze and having a thickness of 100 to 250 μm. This is etched or punched out with a mold to form a central conductor.
Phosphor bronze is widely used as a highly reliable spring material because of its excellent strength and spring characteristics, and is excellent in stress corrosion cracking resistance. By using such phosphor bronze as the central conductor, the lead portion has both strength and springiness. Phosphor bronze tends to have a contradictory electrical resistivity with respect to strength and springiness. Depending on the electrical resistivity of the metal material having springiness to be used, it is desirable to plate a metal having a good conductivity such as Au, Ag or Cu on the surface.

The conductive tab terminal in the present invention preferably has a substantially cylindrical shape having a flat bottom surface, a truncated cone shape, and a push pin shape, and is an iron-based, copper-based, silver-based, or gold-based metal, Alternatively, any of these alloys is preferably used. Depending on the electric resistivity of the metal material to be used, it is desirable that the surface is plated with a metal having good conductivity such as Au, Ag, or Cu.
Further, the shape of the bottom side connected to the wiring of the mother board is allowed to be spherical or needle-shaped as long as it is difficult to process and does not cause a problem due to a decrease in the connection area.

Since the tab terminal is inserted through the through hole formed at the end of the lead part, in addition to a simple columnar shape, it has a truncated cone shape, or a step is provided in the middle, with a thin shaft part and a thick shaft part. It is more preferable that the push pin is configured. In either case, insertion is restricted by the diameter of the through hole formed at the end of the lead portion. For this reason, the tab terminal is not inserted more than necessary into the through hole of the lead part, and the height of the tab terminal appearing on the motherboard side from the lead part is uniquely determined by the step or inclination, and the tab terminal and the mother boat Can be made substantially parallel. By setting the motherboard side of the tab terminal to the thick shaft side, the fixing area can be increased to increase the strength.
If the mother boat is deformed, it is easy to change the distance between the tab terminal and the mother boat for each terminal according to its shape, and the bottom surface of the tab terminal is lower than the bottom surface of the storage container. If it forms, a lead part will bend by mounting on the mounting member, and the bottom face of the storage container and the bottom face of the tab terminal can be made into the almost same surface.

  In the nonreciprocal circuit device of the present invention, the storage container may be placed on the plate member. Some of the plate-like members have a recess for arranging a storage container. The plate-like member is a metal plate made of a metal material such as SPCC or an aluminum alloy, for example, an ADC12 material of an Al—Si—Cu alloy, or a resin plate such as a glass epoxy resin. A resistor is mounted on the plate-like member, or a mounting screw hole to the housing is provided. The lead portion extends from the plate-like member, and the tab terminal is located on the outer edge side. If the bottom surface of the tab terminal is formed lower than the bottom surface of the plate-like member, the lead portion bends by being placed on the mounting member, and the bottom surface of the storage container and the bottom surface of the tab terminal are substantially flush with each other. I can do it.

  In some cases, a recess formed on the mounting member is formed to reduce the height or position the storage container or the plate-like member. In such a case, the bottom surface of the tab terminal may be formed higher than the bottom surface of the storage container or the bottom surface of the plate member.

  According to the present invention, it is possible to provide a surface-mounting non-reciprocal circuit element that is not easily affected by a member on which the non-reciprocal circuit element is mounted and is easily electrically connected to a wiring.

1 is a perspective view of a surface-mounting non-reciprocal circuit device according to an embodiment of the present invention mounted on a motherboard. 1 is an exploded perspective view of a surface-mounted nonreciprocal circuit device according to an embodiment of the present invention. It is a top view of the center conductor used for the surface mounting type nonreciprocal circuit device based on one Example of this invention. It is a perspective view of the tab terminal used for the surface mount type nonreciprocal circuit device concerning one example of the present invention. It is the elements on larger scale which show the mounting state to the motherboard of the surface mounting type nonreciprocal circuit device based on one Example of this invention. It is a figure for demonstrating the bending of the lead part of the center conductor used for the surface mount type nonreciprocal circuit device based on one Example of this invention. It is the enlarged view and sectional drawing which show the other aspect of the lead part of the center conductor used for the surface mount type nonreciprocal circuit device based on one Example of this invention. It is a disassembled perspective view of the surface mount type nonreciprocal circuit device according to another embodiment of the present invention. It is the elements on larger scale which show the mounting state to the motherboard of the surface mounting type nonreciprocal circuit device based on the other Example of this invention. It is a perspective view which shows an example of the conventional surface mount type nonreciprocal circuit device. It is a partial exploded perspective view which shows the structure of the conventional surface mount type nonreciprocal circuit device. It is the elements on larger scale which show the mounting state to the motherboard of the conventional surface mount type nonreciprocal circuit element. It is a perspective view which shows the other example of the conventional surface mount type nonreciprocal circuit device. It is a disassembled perspective view which shows the other example of the conventional surface mount type nonreciprocal circuit device.

A surface mount type nonreciprocal circuit device according to an embodiment of the present invention will be described in detail with reference to the drawings using an isolator having a termination resistor as an example. FIG. 1 is a perspective view of a surface-mounted nonreciprocal circuit device according to an embodiment of the present invention mounted on a motherboard, and FIG. 2 is a perspective view of the surface-mounted nonreciprocal circuit device according to an embodiment of the present invention. It is a disassembled perspective view.
The nonreciprocal circuit device includes a storage container (lower case) 10 having openings 13 in three directions, and an extension 12 projecting from the outer periphery of the storage container 10 is formed in one of the openings 13. A central conductor 40 is disposed inside the container 10, a part of the lead portion 20 extends outside from the opening 13, and is connected to the tab terminal 5 at the end of the extension portion. The lead portion 20 not connected to the tab terminal 5 is connected to the absorption resistor R disposed on the extension portion 12. A plurality of housing members including the center conductor 40 are disposed in the housing container (lower case) 10. From the inner bottom surface side, the lower ground plate 63, the plate-like ferrite 30 b, the center conductor 40, the plate-like ferrite 30 a, and the shield plate 60. The lower iron plate 65, the permanent magnet 3, and the upper iron plate 70 are stacked and accommodated in this order. Further, the cover 15 is put on, and the storage container 10 and the cover 15 are fixed by brazing with solder or the like, or caulking, welding, etc., and the pressing force generated by the fixing acts on the storage member, and they are also combined. Fixed.

FIG. 3 is a plan view of the central conductor 40 used in the surface mount type nonreciprocal circuit device of this embodiment. The lead portion 20 extends from the central common conductor portion 45 in three directions at angles θa, θb, and θc, and is bent at an angle θd on the way. If the impedance at the input and output ends is the same as a basic design, the angles θa, θb, and θc are 120 °, respectively. However, in the isolator, the terminal resistor R that is added includes a lot of reactance components at the operating frequency. If this occurs, an impedance shift occurs and the electrical characteristics are degraded. Therefore, in order to compensate for this, the angle between the lead portion 20 connected to the termination resistor R and the other lead portion 20 may be set to 100 ° to 120 °. In this case, the angle between the other lead portions 20 through which high-frequency signals are input and output is 120 ° to 160 °.
The thickness of the center conductor 40 may be a thickness that allows the lead portion 20 to have springiness, and is preferably 50 μm to 250 μm if it is a phosphor bronze thin plate. As the thickness of the central conductor 40 increases, the space formed between the plate-like ferrites 30a and 30b increases, and the leakage magnetic flux that does not contribute to the operation as a nonreciprocal circuit element increases.
Further, the width of the lead portion may be a width that does not easily deform due to twisting or an external force from the lateral direction, and is preferably 2 mm to 5 mm if it is made of a phosphor bronze thin plate.

In the present invention, the lead portion 20 of the central conductor 40 is bent in a plane direction different from the extending direction from the plate-like ferrites 30a and 30b.
FIG. 6 is a diagram showing a state of bending with respect to an external force acting on the lead portion 20. When the lead portion 20 is formed in a linear shape in the extending direction without providing a bent portion, a portion that is sandwiched between the plate-like ferrites 30a and 30b when an external force acts on the end portion (moving end) and a large displacement occurs. A large stress is generated at the (fixed end), and the lead portion 20 may be plastically deformed. Therefore, in the present invention, the lead portion 20 is bent at an angle θd in the middle, so that the vertical displacement on the moving end side is changed to be partially twisted on the plate-like ferrite side.
The lead portion 20 is easily deformed with respect to the vertical displacement, but is difficult to be deformed with respect to the twist. Therefore, the displacement (bending) on the tab terminal side is limited to an extent necessary for electrical connection. However, the lead portion 20 can be prevented from being plastically deformed even by a large external force. Moreover, since the length of the lead part 20 is small but can be secured long, the stress acting on the fixed end can also be reduced. In this embodiment, the angle θd is preferably 100 ° to 170 °, although it depends on the angles θa to θc.

  Further, as shown in FIGS. 7A and 7B, in order to improve the bending resistance by the depression, a linear depression 27 is formed between the fixed end of the lead portion 20 and the tab terminal 5 in parallel with the extending direction. May be formed. The indentation can be formed by casting with a mold. A U-shape or a V-shape may be formed in a cross-sectional view, and a plurality of them may be provided to form a wave shape.

  An example of the shape of the tab terminal 5 is shown in FIGS. It is formed in a cylindrical shape (a), a truncated cone shape (b), or push pin shapes (c), (d). In the case of a push pin shape, the center of the thin axis and the thick axis may not be concentric. Of course, the center can be different. It is preferable that they are concentric from the viewpoint of ease of processing, and the thin shaft side may be formed into a cylinder or a truncated cone shape, and the thick shaft side may be formed into a polygonal shape.

FIG. 5 is a partially enlarged cross-sectional view when the tab terminal 5 is inserted into the through hole 22 at the end of the lead portion 20 and fixed by soldering, and then placed on the mounting member 204 and connected to the wiring 205. In addition, a connection state with the lead portion 20 when the tab terminal 5 has a different shape is shown.
If the bottom surface 6 of the tab terminal 5 is formed to be lower than the bottom surface 11 of the storage container 10 by several tens of μm to several hundreds of μm, the lead portion 20 slightly bends due to the mounting on the mounting member 204, and the storage container The bottom surface 11 of 10 and the bottom surface 6 of the tab terminal 5 are substantially flush with each other. Further, if the tab terminal 5 is a truncated cone shape or a push pin shape as shown in FIGS. 5 (i) to (iv), the protruding length of the tab terminal 5 on the mounting member 204 side can be easily increased by a step or the like. It can be specified. The through hole at the end of the lead portion 20 through which the tab terminal 5 is inserted is circular, oval, polymorphic, or a modification thereof, and the lead portion on the outer peripheral side is removed, for example, as a C-shaped through hole. good.

Example 1
Hereinafter, the nonreciprocal circuit device according to the present invention will be described in detail. Since the entire configuration is the same as that of FIGS. 1 and 2 already described in the previous section, the description of the overlapping parts will be omitted. A lower ground plate 63 having a thickness of 0.1 mm was disposed on the inner bottom surface of the storage container 10 made of SPCC. In the storage container 10, a plating layer having a total thickness of 10 to 30 μm is formed in the order of lower Cu—intermediate part Ni—upper Au.
A plate-like ferrite 30 b is disposed on the lower ground plate 63. Further, a central conductor 40 is disposed thereon. The central conductor 40 is formed by etching phosphor bronze having a thickness of 150 μm. The lead portion 20 extends at an angle of 120 °, and the lead portion 20 connected to the tab terminal 5 is bent at an angle of 150 °.

  A through hole 22 having a diameter of 0.6 mm is formed at the end of the lead portion 20 through which high-frequency signals are input and output. A tab terminal 5 formed in a push pin shape having a thin shaft side of φ0.50 mm and a thick shaft side of φ1.0 mm is inserted into the through hole 22 on the thin shaft side and connected to the lead portion 20 by solder. Yes. The length of the tab terminal 5 appearing at the lower portion of the lead portion 20 is formed such that its lower surface is about 0.1 m lower than the lower surface of the storage container 10.

A plate-like ferrite 30 a is disposed on the center conductor 40. As the plate-like ferrites 30a and 30b, garnet ferrite having a diameter of 17 mm and a thickness of 0.5 mm, a relative dielectric constant εr of 11, a saturation magnetization of 4πMs of 115 mT, and a dielectric loss tan δε of 2 × 10 ⁻⁴ was used.

On the plate-like ferrite 30a, a shield plate 60 having a thickness of 0.1 mm, a lower iron plate 65 made of SPCC having a thickness of 0.8 mm, a permanent magnet 3 having a diameter of 20 mm and a thickness of 5 mm, and an upper iron plate 70 having a thickness of 0.8 mm. Are stacked and accommodated in order. Further, a lid 15 made of SPCC and having a thickness of 0.2 mm was disposed, and the end of the lid 15 was caulked to the folded portion at the upper end of the storage container 10 and fixed together with the housing member.
The permanent magnet 3 was a La-Co substitution type ferrite magnet. As for the magnetic properties, the residual magnetic flux density (Br) is 430 to 450 mT, and the intrinsic coercive force (iHc) is 382 to 414 KA / m.

  The obtained surface mount type nonreciprocal circuit device was placed on a motherboard. In order to check the connection state with the tab terminal 5 of the surface mount type non-reciprocal circuit element, the wiring is placed without applying a connecting member such as solder, and in this state, between the wirings connected to the two lead portions 20 The resistance value was confirmed. As a result, it was confirmed that there was no difference in resistance value between the tab terminals of the surface mount type nonreciprocal circuit element and a good mounting state was obtained. Furthermore, a bending test was repeated in which the wiring and the tab terminal were soldered and external force was applied to the mother board to bend repeatedly, but the connection state between the wiring and the tab terminal was maintained well.

(Example 2)
The structure by the surface pattern type nonreciprocal circuit device by the other aspect is shown. FIG. 8 is an exploded perspective view showing the structure. FIG. 9 shows a partially enlarged cross-sectional view when arranged on the mounting member 204. In this surface mount type nonreciprocal circuit device, the storage container 10 and the terminating resistor 80 are placed on the plate-like member 6, and the basic configuration is the same as that shown in FIGS. 1 and 2. It is.
The plate-like member 6 is a metal plate made of an Al-Si-Cu-based ADC12 material, is a rectangle of 45 mm x 35 mm and has a thickness of 1.2 mm, and screw holes for attachment are formed at the four corners. . The bottom surface of the tab terminal 5 is formed to be approximately 0.05 nn lower than the bottom surface of the plate-like member, and the lead portion is bent by mounting on the mounting member 205, and the bottom surface of the storage container and the bottom surface of the tab terminal are Can be made substantially the same plane.

5 Tab terminal 10 Storage container 20 Lead part 30a, 30b Plate-shaped ferrite 40 Center conductor

Claims (5)

A nonreciprocal circuit comprising a conductive tab terminal connected to an end portion of a lead portion of a central conductor extending from the storage container, in which a plate-shaped ferrite, a central conductor, and a permanent magnet are arranged in a storage container. An element,
The lead portion is centered on the common conductor portion of the central conductor that is overlapped with the plate-like ferrite, and radially extends in three directions at predetermined angular intervals and appears on the outer edge side portion of the plate-like ferrite, and the tip of the lead portion It is bent in a plane direction different from the extending direction inside, and the plate-like ferrite outer edge side portion side becomes a fixed end and can be bent with the tab terminal side as a moving end ,
The surface mount type non-reciprocal circuit device , wherein the lead portion is formed with a linear recess in parallel with the extending direction between the plate ferrite outer edge side and the tab terminal side . A nonreciprocal circuit comprising a conductive tab terminal connected to an end portion of a lead portion of a central conductor extending from the storage container, in which a plate-shaped ferrite, a central conductor, and a permanent magnet are arranged in a storage container. An element,
The lead portion is centered on the common conductor portion of the central conductor that is overlapped with the plate-like ferrite, and radially extends in three directions at predetermined angular intervals and appears on the outer edge side portion of the plate-like ferrite, and the tip of the lead portion It is bent in a plane direction different from the extending direction inside, and the plate-like ferrite outer edge side portion side becomes a fixed end and can be bent with the tab terminal side as a moving end,
The tab terminal has a substantially cylindrical shape having a flat bottom surface, a truncated cone shape, a push pin shape,
The storage container is placed on a plate-like member, the lead portion extends from the plate-like member, the tab terminal is positioned on the outer edge side thereof, and the bottom surface of the tab terminal is formed lower than the bottom surface of the plate-like member. A surface-mounting non-reciprocal circuit device. A nonreciprocal circuit comprising a conductive tab terminal connected to an end portion of a lead portion of a central conductor extending from the storage container, in which a plate-shaped ferrite, a central conductor, and a permanent magnet are arranged in a storage container. An element,
The lead portion is centered on the common conductor portion of the central conductor that is overlapped with the plate-like ferrite, and radially extends in three directions at predetermined angular intervals and appears on the outer edge side portion of the plate-like ferrite, and the tip of the lead portion It is bent in a plane direction different from the extending direction inside, and the plate-like ferrite outer edge side portion side becomes a fixed end and can be bent with the tab terminal side as a moving end,
The tab terminal has a substantially cylindrical shape having a flat bottom surface, a truncated cone shape, a push pin shape,
The storage container is placed on a plate-like member, the lead portion extends from the plate-like member, the tab terminal is positioned on the outer edge side thereof, and the plate-like member is formed in a recess formed on the mounting member. A surface-mounting non-reciprocal circuit device that is mounted and has a bottom surface of the tab terminal formed higher than a bottom surface of the plate-like member. 4. The surface-mounting nonreciprocal circuit device according to claim 1, wherein the central conductor is formed of a thin plate made of phosphor bronze. The surface-mounting type nonreciprocal according to claim 2 or 3 , wherein when the nonreciprocal circuit element is placed on the mounting member, the bottom surface of the storage container and the bottom surface of the tab terminal are substantially flush with each other. Circuit element.

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