JP3159054B2 - Non-reciprocal circuit device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nonreciprocal circuit device used in a high frequency band such as a microwave band, for example, an isolator and a circulator.

Generally, non-reciprocal circuit elements such as lumped-constant isolators and circulators have characteristics in which the amount of attenuation is extremely small in the signal transmission direction and extremely large in the reverse direction. And so on.

As this type of isolator, for example, FIG.
0 is available. This isolator 50
In a magnetic closed circuit mainly composed of an upper yoke 51 and a lower yoke 52, a magnetic assembly 54 including a permanent magnet 53, three center electrodes 56 and a ferrite 57, and a resin block 55 are arranged. Things. The resin block 55 is formed with positioning recesses 55a, 55b, and 55c for accommodating the permanent magnet 53, the magnetic assembly 54, and the input / output port portions P1 to P3 of the respective center electrodes 56. Matching capacitors C1 to C3 are connected to the sections P1 to P3. Termination resistors R1 and R2 are connected to the one input / output port P3 via a connection piece 58. A terminal board 59 is fitted on the outer surface of the lower yoke 52, and the input / output port portions P1 and P2 are provided on the input / output terminal electrodes 60 and 61 of the terminal board 59, respectively.
The grounding terminal electrodes 62, 62 have the terminating resistors R1, R2
Are connected respectively.

In the case of connecting the above-mentioned component elements in such an isolator 50, conventionally, for example, cream solder is applied to the input / output port portions P 1 to P 3 of each center electrode 56, and this is arranged in a resin block 55. At the same time, the electrodes of the capacitors C1 to C3, the terminating resistors R1 and R2, and the terminal electrodes 60 to 62 are arranged in contact with each other, and these component elements are fixed by a jig. In this state, the cream solder is melted and solidified. Then, the jig is removed and the yoke 5
1, 52.

[0005]

However, in the above-mentioned conventional assembling structure, each component element is incorporated into a jig,
The work of removing the jig after the soldering and fixing is necessary, and there is a problem that the cost increases as the number of assembly steps increases.

In the above-mentioned conventional structure, since the jig is used repeatedly, the fixing force is liable to be deteriorated by being exposed to the high temperature at the time of reflow each time, and a connection failure may occur. There is a problem that must be. Further, in the conventional structure, when the isolator is mounted on an external circuit board by user reflow, there is a possibility that the solder of the internal element is melted to cause an open defect.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional situation, and can reduce costs by reducing the number of assembling steps, can eliminate the need for management of connection failure and jigs, and can be used when mounting on an external circuit board. It is an object of the present invention to provide a non-reciprocal circuit device capable of preventing the open failure of the circuit.

[0008]

According to the first aspect of the present invention,
In a magnetic circuit configured by disposing permanent magnets in the lower yoke, a magnetic assembly in which a plurality of center electrodes are arranged in a magnetic body so as to cross each other in an electrically insulated state, In a non-reciprocal circuit device comprising: a matching capacitor to which an input / output port is connected; and a resin substrate containing the capacitor and the magnetic assembly and having an external connection terminal electrode to which each of the input / output ports is connected. And a pressing member that presses the magnetic assembly and presses the input / output port of the center electrode disposed on the magnetic assembly in the magnetic circuit.

[0009]

A second aspect of the present invention is characterized in that, in the first aspect, the pressing member contacts and fixes the input / output port of each center electrode, each matching capacitor, and each terminal electrode. .

According to a third aspect of the present invention, in the first aspect, the pressing member is configured to contact and fix the ground portion of each of the center electrodes to the inner surface of the yoke.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the pressing member has a spring property.

According to a fifth aspect of the present invention, in any one of the first to third aspects, the pressing member has an adhesive property.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 to FIG.
FIGS. 1 to 4 are exploded perspective views, sectional views, and plan views of the isolator, respectively, and FIGS. 5 to 5 are plan views of a magnetic assembly. FIG. 6 is a plan view of the resin substrate, and FIGS.
FIG. 4 is a cross-sectional view of a connection portion of an input / output port of a center electrode.

In FIG. 1, reference numeral 1 denotes a lumped constant type isolator, which is a box-shaped upper yoke 2 made of a magnetic metal.
A permanent magnet 3 having a rectangular shape is attached to the inner surface thereof, and a substantially U-shaped lower yoke 4 also made of a magnetic metal is mounted on the upper yoke 2 to form a magnetic closed circuit. A resin substrate 5 is provided on a bottom surface 4 a in the lower yoke 4, and a magnetic assembly 6 is provided on the resin substrate 5. The permanent magnet 3 may be a disk-shaped one.

In the magnetic assembly 6, three center electrodes 8 to 10 are arranged on the upper surface of a disk-shaped ferrite 7 at an angle of 120 degrees with an insulating sheet (not shown) interposed therebetween. An input / output port P at one end of each of the center electrodes 8 to 10
1 to P3 are projected outwardly, and the grounding portion 11 on the other end side is in contact with the bottom surface of the ferrite 7 so that the permanent magnet 3 applies a DC magnetic field to the magnetic assembly 6. Is configured.

The resin substrate 5 has a structure in which a bottom wall 5b is integrally formed with a rectangular frame-shaped side wall 5a, and an insertion hole 5c is formed in the center of the bottom wall 5b. On the periphery, the capacitor housing recesses 5d to 5f and the resistor housing recess 5g are respectively provided. The bottom wall 5b
The input / output port electrodes 13, 13 are formed at one side corner, and the respective port electrodes 13, 13 are led out to terminal electrodes 14, 14 formed on the outer surface of the side wall 5b.

The magnetic assembly 6 is disposed in the insertion hole 5c, and the ground portion 11 of the magnetic assembly 6 is connected to the bottom surface 4a of the lower yoke 4. In each of the storage recesses 5d to 5f, matching chip capacitors C1 to C3 are provided.
However, a chip terminating resistor R is disposed in each of the remaining storage recesses 5g, and the lower surface electrodes of the capacitors C1 to C3 and the electrode on one end side of the terminating resistor R are respectively connected to the ground. The input / output port portions P1 of the center electrodes 8 to 10 are provided on the upper surface electrodes of the capacitors C1 to C3.
P3 is connected to these two port sections P1 and P2.
Are connected to the port electrodes 13, 13, respectively. The other end of the input / output port P3 is connected to an electrode on the other end of the terminating resistor R.

A pressing member 15 is provided between the magnetic assembly 6 and the permanent magnet 3. This pressing member 1
Reference numeral 5 denotes a body made of a liquid crystal polymer or the like having spring properties, heat resistance, and insulation properties.
5b are integrally formed. Each arm 1
An R-shaped pressing portion 15c is projected from the lower surface of the distal end of 5b, and a lightening hole 15d is formed in each arm 15b and main body 15a to reduce the weight. Here, the size and shape of the arm portion 15b are designed according to the required pressing force, and are not particularly limited.

The pressing member 15 electrically and mechanically presses and fixes the magnetic assembly 6 and the resin substrate 5 to the lower yoke 4 via the permanent magnet 3 while fitting the upper yoke 2 on the lower yoke 4. . The main body 15a is connected to the ground portion 11 of each of the center electrodes 8 to 10 via the ferrite 7 and the lower yoke 4
Is pressed and fixed on the bottom surface 4a of each of the arms, and the pressing portions 15c of the arms 15b are connected to the input / output port portions P1 to P1 of the center electrodes 8 to 10.
P3 is pressed and fixed to the electrodes of the capacitors C1 to C3, the terminating resistor R, and the input / output port electrode 13.

Next, the operation and effect of this embodiment will be described. In order to assemble the lumped constant type isolator 1 of the present embodiment, first, the input / output port portions P1 to P1 of the center electrodes 8 to 10 are used.
P3, cream solder 16 is applied to the electrodes in the storage recesses 5d to 5f of the resin substrate 5, respectively. And the lower yoke 4
The resin substrate 5 is disposed thereon, and the magnetic assemblies 6, the matching capacitors C1 to C3, and the terminating resistors R are disposed in the insertion holes 5c and the storage recesses 5d to 5g of the resin substrate 5, respectively. The upper yoke 2 is fitted to the lower yoke 4 with the pressing member 15 disposed on the assembly 6.
As a result, the pressing member 15 is elastically deformed by the permanent magnet 3, and the main body 15a is connected to the ground portion 11 of each of the center electrodes 8 to 10.
Is pressed and fixed on the bottom surface 4a of the lower yoke 4, and each arm 15b
Press portion 15c presses and fixes the input / output port portions P1 to P3 to the capacitors C1 to C3, the terminating resistor R, and the port electrode 13. In this state, the isolator 1 is reflow-soldered in a high-temperature atmosphere.

As described above, according to the present embodiment, the pressing member 15 is disposed in the upper and lower yokes 2 and 4, and the magnetic assembly 6 is pressed and fixed to the resin substrate 5 electrically and mechanically. No special jig for soldering is required. As a result, the troublesome work of assembling and removing each component element from the jig can be omitted, and the cost can be reduced as much as the number of work steps can be reduced.

A pressing member 15 is provided in the isolator 1.
Built-in, it is possible to prevent connection failure due to deterioration when a conventional repetitive jig is used, and it becomes unnecessary to manage the jig.

Further, each of the center electrodes 8 to 8 is
Since the connection portions of the 10 input / output port portions P1 to P3 are always pressed and fixed, when the isolator 1 is mounted on the external circuit board by the user reflow, even if the solder of the connection portions is melted, an open defect does not occur. And reliability for quality can be ensured.

FIG. 9 is a diagram for explaining a lumped-constant isolator according to an embodiment of the present invention.
In the figure, the same reference numerals as those in FIG. 1 indicate the same or corresponding parts.

Lumped constant type isolator 1 of this embodiment
Is constructed by disposing a resin substrate 5 on a lower yoke 4, arranging a magnetic assembly 6, and fitting an upper yoke 2 on which a permanent magnet 3 is adhered to the lower yoke 4. The structure is the same as the above embodiment.

A pressing member 20 is provided between the permanent magnet 3 and the magnetic assembly 6.
Is formed by forming an adhesive layer 20b on the lower surface of a flexible plate member 20a. The magnetic assembly 6 is electrically and mechanically pressed and fixed by the pressing member 20, and the input / output port portions P1 to P3 of the center electrodes 8 to 10, the capacitors C1 to C3, and the terminating resistor R are fixed by the adhesive layer 20b. Is being held down.

According to the present embodiment, the magnetic assembly 6, the capacitors C1 to C3, and the terminating resistor R are pressed and fixed by the pressing member 20, so that the number of work steps can be reduced and the cost can be reduced. Can be prevented, and the same effect as the above embodiment can be obtained.

In the above embodiment, the lumped-constant type isolator has been described as an example. However, the present invention can be applied not only to a circulator but also to a non-reciprocal circuit device used in other high-frequency components.

[0030]

As described above, according to the non-reciprocal circuit device according to the first aspect of the present invention, the magnetic assembly is pressed into the magnetic circuit including the upper and lower yokes, and is disposed on the magnetic assembly. Since a pressing member that presses the input / output port of the center electrode is provided, there is no need for a jig dedicated to soldering, which has the effect of reducing man-hours and costs, and has poor connection due to deterioration of the jig. In addition to this, there is an effect that the open defect at the time of mounting by user reflow can be prevented.

According to the second aspect of the present invention, since the input / output port of each center electrode and each matching capacitor and each terminal electrode are fixedly contacted by the pressing member, the soldered portion can be securely fixed, and the solderability is improved. There is an effect that can be improved.

According to the third aspect of the present invention, since the earth portion of each center electrode is fixed to the inner surface of the yoke by the pressing member, the soldered portion can be securely fixed and the solderability can be improved.

According to the fourth aspect of the present invention, since the pressing member is provided with a spring property, an electric and mechanical fixing force can be further improved.

According to the fifth aspect of the present invention, since the pressing member is provided with adhesiveness, the electric and mechanical fixing force can be further improved.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view illustrating a lumped-constant isolator according to an embodiment of the present invention.

FIG. 2 is a sectional view of the isolator (II-I in FIG. 4).
I line cross section).

FIG. 3 is a cross-sectional view of the isolator (III- in FIG. 4).
III sectional view).

FIG. 4 is a plan view of the isolator.

FIG. 5 is a plan view of a magnetic assembly of the isolator.

FIG. 6 is a plan view of a resin substrate of the isolator.

FIG. 7 is a sectional view showing a connection portion of an input / output port of the center electrode.

FIG. 8 is a cross-sectional view showing a connection portion of an input / output port of the center electrode.

FIG. 9 is an exploded perspective view showing a lumped constant type isolator according to an embodiment of the present invention.

FIG. 10 is an exploded perspective view showing the structure of a conventional general isolator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Isolator (non-reciprocal circuit element) 2 Upper yoke 3 Permanent magnet 4 Lower yoke 5 Resin board 6 Magnetic assembly 7 Ferrite (magnetic material) 8-9 Center electrode 15, 20 Pressing member P1-P3 Input / output port part C1-C3 Matching capacitor

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yutaka Ishiura 2-26-10 Tenjin, Nagaokakyo-shi, Kyoto Inside Murata Manufacturing Co., Ltd. (72) Inventor Hiroshi Tokudera 2-26-10 Tenjin, Nagaokakyo-shi, Kyoto Inside Murata Manufacturing Co., Ltd. (56) References Japanese Utility Model 7-14704 (JP, U) Japanese Utility Model 3-105008 (JP, U) Japanese Utility Model 2-804 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) H01P 1/36 H01P 1/383 H01P 1/387

Claims (5)

(57) [Claims] 1. A magnetic assembly comprising a magnetic circuit having a plurality of central electrodes arranged in a magnetic circuit so as to intersect with each other in a state of being electrically insulated from each other in a magnetic circuit having permanent magnets disposed in upper and lower yokes. And a matching capacitor to which the input / output port of each of the center electrodes is connected, and a resin substrate containing the capacitor and the magnetic assembly and having an external connection terminal electrode to which each of the input / output ports is connected. In the provided non-reciprocal circuit device, when the magnetic assembly is pressed into the magnetic circuit,
In addition, the input / output ports of the center electrode arranged on the magnetic assembly
A non-reciprocal circuit device , comprising a pressing member for pressing a sheet . 2. The non-reciprocal circuit device according to claim 1, wherein the pressing member fixes the input / output port of each of the center electrodes to each of the matching capacitors and each of the terminal electrodes. 3. The non-reciprocal circuit device according to claim 1, wherein the pressing member contacts and fixes the ground portion of each of the center electrodes to an inner surface of the yoke. 4. The non-reciprocal circuit device according to claim 1, wherein the pressing member has a spring property. 5. The non-reciprocal circuit device according to claim 1, wherein the pressing member has an adhesive property.