JPH077308A - Irreversible circuit element - Google Patents

Abstract

PURPOSE:To prevent the position of a central electrode or a ground substrate from being deviated in the case of assembly by providing engaging parts respectively at a magnet fixing member, central electrode and ground substrate and engaging them mutually at the engaging parts. CONSTITUTION:A pair of engaging holes 15 and 15 through front and rear sides are provided at positions so as to not to be overlapped with electrodes formed on the surface and inside of a central electrode 5. On the lower face of a magnet fixing member 4, a pair of engaging projections 16 and 16 are provided at positions corresponding to the engage holes 15 and 15.On a ground substrate 6, a pair of engage holes 17 and 17 are provided at positions corresponding to the engage holes 15 and 15 so as not to be overlapped with the electrode formed on the surface. In the case of assembly, the engaging projections 16 and 16 are inserted to the engaging holes 15 and 15 and the engaging holes 17 and 17.

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 such as an isolator and a circulator, and more particularly to preventing misalignment when assembling parts and fixing a center electrode and an electrode formed on a grounding board to a magnet. The present invention relates to a structure of a non-reciprocal circuit device capable of reliably connecting an input / output electrode and a ground electrode formed on a member and improving productivity.

[0002]

2. Description of the Related Art Generally, an isolator or a circulator has a function of passing a signal only in a transmission direction and blocking a signal in the opposite direction. For example, an electronic component indispensable to a mobile communication device such as a mobile phone or a car phone. Is. As an example of such an isolator, there is a structure shown in FIGS.

In this isolator 21, a copper foil 27 and an earth substrate 26 are disposed on a lower yoke 28 made of a magnetic metal, and chip capacitors 32, 33, and a fixing hole formed in the earth substrate 26 at a substantially central portion thereof. 34 and ferrite 29
, A center electrode 25 composed of a plurality of dielectric substrates having electrodes formed on the surface thereof is disposed on the ground substrate 26, and chip resistors 30 and 31 are disposed on the electrodes on the surface of the center electrode 25.
A magnet fixing member 24, which fixes the input / output terminal and the ground terminal by integrally molding the resin on the center electrode 25, is arranged, and the magnet 23 is housed in the opening formed in the approximate center of the magnet fixing member 24. , Lower yoke 28 to upper yoke 22
It is configured by inserting.

[0004]

By the way, conventionally, when assembling the above isolator, the magnet, the magnet fixing member, the center electrode, the earth substrate, the ferrite, the copper foil, and the lower portion are turned upside down. They were arranged in the order of the yoke and assembled. That is, the center electrode and the ground substrate are stacked and assembled so that the respective electrodes are positioned so as to be connected to the input / output terminal and the ground terminal formed on the magnet fixing member. Therefore, when stacking the center electrode and the ground substrate, there is a risk of misalignment.

If such a displacement occurs when stacking the center electrode and the ground substrate, if the state is left as it is, the lower yoke is fitted to the center electrode or the ground when the lower yoke is fitted to the upper yoke. There was a problem in that it was difficult to assemble the components by hitting the substrate.

Even if the center electrode and the earth electrode are displaced relative to the magnet fixing member so that the center electrode or the earth substrate does not hit the lower yoke when the lower yoke is fitted to the upper yoke, When the center electrode and the electrode formed on the grounding terminal are misaligned with the input / output terminal and the grounding terminal formed on the magnet fixing member due to misalignment, between the terminal and the center electrode and the electrode on the grounding board There is a risk that connection failure may occur, and as a result, the assembled parts may not have desired characteristics.

The present invention has been made in view of these problems, and an object of the present invention is to provide a nonreciprocal circuit device capable of preventing the positional displacement of the center electrode and the ground substrate that occurs during assembly.

[0008]

Therefore, according to the present invention, at least a center electrode made of a dielectric substrate having electrodes,
A non-reciprocal circuit device comprising: a ground substrate made of a dielectric substrate having an electrode; and a magnet fixing member having a portion for fixing a magnet, wherein the magnet fixing member has a first engaging portion, A second engaging portion that engages with the first engaging portion is formed on the center electrode, and at least one of the first engaging portion and the second engaging portion is provided on the ground electrode. Is characterized in that a third engaging portion for engaging with is formed.

[0009]

According to the present invention, since the engaging portions are formed on the magnet fixing member, the center electrode, and the grounding board, and the engaging portions engage with each other, when assembling the nonreciprocal circuit device, It is possible to prevent the center electrode and the ground substrate from being displaced.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram for explaining one embodiment of the present invention. In this embodiment, a lumped constant type isolator will be described as an example.

As shown in the figure, in the isolator 1, a copper foil 7 and a grounding substrate 6 are provided on a lower yoke 8 made of a magnetic metal, and a chip is formed in a fixing hole formed substantially in the center of the grounding substrate 6. Capacitors 12, 13, 14 and ferrite 9
A center electrode 5 made up of a plurality of dielectric substrates each having an electrode formed on the surface thereof is disposed on the ground substrate 6, and the chip resistors 10 and 11 are disposed on the electrodes on the surface of the center electrode 5. A magnet fixing member 4 having an input / output terminal and an earth terminal fixed by being integrally molded with resin or the like is disposed on the magnet 5, and the magnet 3 is housed in an opening formed in a substantially central portion of the magnet fixing member 4. It is configured by inserting the upper yoke 2 into the yoke 8.

The center electrode 5 is formed by laminating three substrates made of resin or the like. In addition, port I electrode, port II electrode, port
III electrodes are formed, and these three substrates are formed so that they are alternately overlapped, and the respective port electrodes are connected by through holes. further,
The center electrode 5 is formed with a pair of engagement holes 15 and 15 at positions not overlapping the respective port electrodes.

The magnet fixing member 4 is integrally formed by using, for example, a material such as resin, and an opening for storing a magnet is formed in an upper portion of the magnet fixing member 4. Further, the magnet fixing member 4 is fixed with an input / output terminal and a ground terminal by insert molding. Further, the lower surface of the magnet fixing member 4 has an engaging hole 1 formed in the center electrode 5.
A pair of engaging protrusions 1 are provided at positions corresponding to 5 and 15, respectively.
6, 16 are formed. In addition, one of the engaging protrusions 1
6 is not shown.

The earth substrate 6 is formed by forming electrodes on a substrate made of resin or the like, and a fixing hole is formed in the substantially central portion thereof, and the ferrite 9 and the chip capacitor 12 for obtaining the capacitance are formed in the fixing hole. , 13, 14 are accommodated. The ground substrate 6 has a pair of engagement holes at positions corresponding to the pair of engagement holes 15, 15 formed in the center electrode 5 and at positions not overlapping the electrodes formed on the surface of the ground substrate 6. 17, 17 are formed.

Therefore, in the case of the present embodiment, when the isolator 1 is assembled, the engaging projections 16, 16 formed on the magnet fixing member are engaged with the engaging holes 15, 16 formed in the center electrode 5.
15 and the engaging holes 17, 17 formed in the ground substrate 6 are inserted and engaged to assemble.

As described above, in this embodiment, the engaging protrusions are formed in the magnet fixing member, the engaging holes are formed in the center electrode and the ground substrate, and the engaging protrusions are formed in the engaging holes of the center electrode and the earth substrate. Since they are inserted and engaged with each other, when the non-reciprocal circuit device is assembled, the center electrode and the ground substrate can be prevented from being displaced.

In this embodiment, as the engaging portion, the engaging protrusion is formed on the magnet fixing member and the engaging hole is formed on the center electrode and the ground substrate. However, the present invention is not limited to this.
For example, a cut-and-raised engagement portion may be used.
It suffices if the magnet fixing member, the center electrode, and the engaging portion formed on the ground substrate can prevent the displacement.

Further, in the present embodiment, the engagement hole and the engagement projection are paired, but the present invention is not limited to this, and if the position does not overlap the electrode and does not affect the characteristics of the parts, for example, You may make it engage at three points.

[0019]

According to the present invention, when the non-reciprocal circuit device is assembled by forming the engaging portions on the magnet fixing member, the center electrode and the ground substrate, and engaging the engaging portions with each other, Since the positional displacement of the center electrode and the ground substrate can be prevented, it is not necessary to correct the positional displacement of the central electrode and the ground substrate, and the manufacturing process can be speeded up and simplified. Further, since it is possible to prevent the characteristic deterioration of the component due to the displacement of the center electrode and the ground substrate, it is possible to suppress the characteristic variation among the components and to make the quality of the component constant.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an isolator according to an exemplary embodiment of the present invention.

FIG. 2 is a perspective view of a conventional isolator.

FIG. 3 is a sectional view taken along line XX of the conventional isolator shown in FIG.

FIG. 4 is an exploded perspective view of the conventional isolator shown in FIG.

[Explanation of symbols]

 1 Isolator 2 Upper yoke 3 Magnet 4 Magnet fixing member 5 Center electrode 6 Earth substrate 7 Copper foil 8 Lower yoke 9 Ferrite 10,11 Chip resistor 12,13,14 Chip capacitor 15,17 Engagement hole 16 Engagement protrusion

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Kawanami 2-26-10 Tenjin, Nagaokakyo, Kyoto Prefecture Murata Manufacturing Co., Ltd. (72) Inventor Takashi Hasegawa 2-26-10 Tenjin, Nagaokakyo, Kyoto Stock Company Murata Manufacturing (72) Inventor Katsuyuki Ohira 2 26-10 Tenjin Tenjin, Nagaokakyo, Kyoto Stock Company Murata Manufacturing (72) Inventor Yutaka Ishiura 2 26-10 Tenjin, Nagaokakyo, Kyoto Murata Manufacturing Co., Ltd.

Claims (1)

[Claims] 1. A nonreciprocal circuit device comprising at least a center electrode made of a dielectric substrate having an electrode, a ground substrate made of a dielectric substrate having an electrode, and a magnet fixing member having a portion for fixing a magnet. A first engaging portion is formed on the magnet fixing member, a second engaging portion that engages with the first engaging portion is formed on the center electrode, and at least the ground electrode is formed. A non-reciprocal circuit device, characterized in that a third engaging portion is formed which engages with either one of the first engaging portion and the second engaging portion.