JP2012119801A - Method of manufacturing non-reciprocal circuit element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a non-reciprocal circuit element capable of handling a yoke together with a ferrite and a permanent magnet in collective manner, instead of handling it as a separate particle.SOLUTION: A non-reciprocal circuit element is manufactured which includes a ferrite/magnet element 10 where a center electrode is arranged on at least one main surface of a ferrite 11 containing a pair of main surfaces, facing each other, with permanent magnets 15 fitted to the pair of main surfaces, respectively, of the ferrite 11. The method of manufacturing the non-reciprocal circuit element includes a step in which a metal material 21 having magnetic nature is bonded to upper and lower surfaces of a collective substrate 10' in which the ferrite 11 is sandwiched between the pair of permanent magnets 15, a step for cutting the collective substrate 10' having been bonded with the metal material 21 in a unit of ferrite/magnet element 10, a step for packing a resin material 25 containing magnetic powder in cut surfaces of the unit of ferrite/magnet element 10 having been cut, for solidification, and a step for cutting the resin material 25 having been packed and solidified at almost central portion in the thickness direction.

Description

  The present invention relates to a method for manufacturing a nonreciprocal circuit element, and more particularly to a method for manufacturing a nonreciprocal circuit element such as an isolator or a circulator used in a microwave band.

  Conventionally, nonreciprocal circuit elements such as isolators have a characteristic of transmitting a signal only in a predetermined direction and not transmitting in a reverse direction. Utilizing this characteristic, for example, an isolator is used in a transmission circuit unit of a mobile communication device such as a mobile phone.

  In this type of isolator, a plurality of center electrodes are arranged on the main surface of the ferrite, and a plurality of center electrodes are coupled to the ferrite by applying a direct current magnetic field from a permanent magnet. In this case, it is desirable to prevent leakage of magnetic flux generated from the permanent magnet as much as possible. As described in Patent Document 1, a metal yoke manufactured by sheet metal processing is arranged around the ferrite and the permanent magnet. However, metal yokes manufactured by sheet metal processing are increased in size and need to be handled as individual products independent of ferrite and permanent magnets, which takes time for assembly and the like, and hinders mass productivity.

  On the other hand, Patent Document 2 describes a nonreciprocal circuit element using a box-shaped molded product made of a resin material containing magnetic powder as a yoke. However, this yoke is also an independent individual product, and it takes time and effort to assemble the same as in the case of using the metal yoke.

JP 2007-208943 A JP 2002-330005 A

  Accordingly, an object of the present invention is to provide a method for manufacturing a nonreciprocal circuit device that can handle a yoke integrally with a ferrite or a permanent magnet, not as an individual product.

A method for producing a non-reciprocal circuit device according to one aspect of the present invention includes:
A non-reciprocal circuit device comprising a ferrite magnet element in which a central electrode is disposed on at least one main surface of a ferrite having a pair of opposed main surfaces, and a permanent magnet is fixed to each of the pair of main surfaces of the ferrite. In the manufacturing method,
Bonding a metal material having magnetism to the upper and lower surfaces of an aggregate substrate in which ferrite is sandwiched between a pair of permanent magnets;
Cutting the aggregate substrate to which the metal material is bonded into one unit of ferrite / magnet element;
Filling and curing a resin material containing magnetic powder between the cut surfaces of the cut one unit ferrite-magnet element; and
Cutting the filled and cured resin material at a substantially central portion in the thickness direction;
It is provided with.

  In the non-reciprocal circuit element, the metal material and the resin material containing magnetic powder function as a yoke to prevent leakage of magnetic flux generated from the permanent magnet. In the manufacturing process, the ferrite and a pair of permanent magnets respectively disposed on both main surfaces thereof are aggregate substrates to be cut later, and the metal material used as a yoke and the resin material containing magnetic powder are fixed to the aggregate substrate, It is handled integrally with ferrite and permanent magnets. Therefore, the assembly process is facilitated and the mass productivity is improved.

  According to the present invention, the yoke can be handled integrally with the ferrite and the permanent magnet, not as an individual product, and thus mass productivity is improved.

It is a disassembled perspective view which shows the principal part (ferrite magnet element) of the nonreciprocal circuit element which is one Example. It is a top view of the ferrite magnet element. It is explanatory drawing which shows the manufacturing process of the said ferrite magnet element. It is explanatory drawing which shows the mode of the magnetic flux which arises in the said ferrite magnet element, (A) is an example of this invention, (B), (C) is a comparative example, respectively.

  Embodiments of a nonreciprocal circuit device according to the present invention will be described below with reference to the accompanying drawings. In addition, in each figure, the same code | symbol is attached | subjected about the same member and part, and the overlapping description is abbreviate | omitted.

  The ferrite / magnet element 10 shown in FIG. 1 and FIG. 2 is one element constituting a nonreciprocal circuit element. As the nonreciprocal circuit element, in addition to this element, a circuit board (not shown), an exterior resin, and the like are necessary. It includes inductors and capacitors that are mounted depending on. The basic configuration as a non-reciprocal circuit device that can be manufactured using the present invention has various aspects, and the lumped constant type isolator is a two-port type described in Patent Document 1 described above. Can be mentioned.

  As described in detail in Patent Document 1, the two-port type isolator includes a ferrite to which a DC magnetic field is applied by a pair of permanent magnets, and a first center that is arranged so as to cross the ferrite in an insulated state. An electrode and a second center electrode are provided. The first center electrode has one end connected to the input port and the other end connected to the output port. The second center electrode has one end connected to the output port and the other end connected to the ground port. A termination resistor is connected in parallel with the first center electrode between the input port and the output port, a first matching capacitor is connected between the input port and the output port, and between the output port and the ground port. A second matching capacitor is connected. As shown in FIG. 1, the ferrite 11 provided with the first and second center electrodes is a ferrite-magnet element 10 in which both main surfaces are sandwiched by a pair of permanent magnets 15 via an adhesive 12. It is configured. The terminal resistor and the capacitor are configured as separate parts from the ferrite / magnet element 10.

  The nonreciprocal circuit device to which the present invention can be applied may be a three-port type isolator described in Patent Document 2, or a magnetic resonance type isolator. In the attached drawings, the center electrode provided on the surface of the ferrite is not shown.

  Around the ferrite-magnet element 10, a metal material 21 having magnetism is disposed on the surface facing the main surface 15a of the permanent magnet 15 via an adhesive 22, and magnetic powder enters two surfaces adjacent to the surface. The resin material 25 is disposed via an adhesive 26. As the metal material 21, for example, nickel can be used. For example, epoxy resin can be used as the resin material 25, and ferrite powder can be used as the magnetic powder, for example.

  Here, the manufacturing process of the ferrite magnet element 10 will be described with reference to FIG. First, a magnetic metal material 21 is bonded to the upper and lower surfaces of the aggregate substrate 10 ′ in which the ferrite 11 is sandwiched between a pair of permanent magnets 15 (see FIG. 3A). The width W of the collective substrate 10 'corresponds to the width W of the ferrite / magnet element 10 shown in FIG.

  Next, the aggregate substrate 10 'to which the metal material 21 is bonded is cut into one unit of ferrite / magnet element 10 (see FIG. 3B). Next, a resin material 25 containing magnetic powder is filled between the cut surfaces of the cut unit ferrite / magnet element 10 and cured (see FIG. 3C). In FIG. 3, the adhesives 22 and 26 are not shown. Next, the filled and cured resin material 25 is cut at a substantially central portion (see FIG. 3D). As a result, as shown in FIG. 2, the ferrite-magnet element 10 having four surfaces surrounded by the metal material 21 and the resin material 25 containing magnetic powder is obtained.

  In the ferrite-magnet element 10, the metal material 21 and the resin material 25 function as a yoke. As shown in FIG. 4A, the magnetic flux φ1 generated from the permanent magnet 15 is the metal material 21 and Circulation along the resin material 25 effectively prevents leakage of the magnetic flux φ2. Incidentally, when only the metal material 21 is arranged, the magnetic flux φ2 leaks from the end of the metal material 21 as shown in FIG. When the resin material 25 containing magnetic powder is disposed on the four surfaces, the magnetic flux φ2 leaks relatively large outside the resin material 25 as shown in FIG.

  In this embodiment, the metal material 21 functioning as a yoke and the resin material 25 containing magnetic powder are assembled in the course of the manufacturing process to the ferrite / magnet element 10 which is handled as the collective substrate 10 'without being handled as individual products in the manufacturing process. To go. Therefore, the metal material 21 and the resin material 25 can be handled integrally with the ferrite 11 and the permanent magnet 15, the assembling process becomes easy, and the mass productivity is improved. In particular, by arranging the metal material 21 on the surface facing the main surface 15a of the permanent magnet 15, the effect of preventing leakage of magnetic flux is increased.

  In addition, the manufacturing method of the nonreciprocal circuit device according to the present invention is not limited to the above-described embodiment, and it is needless to say that various changes can be made within the scope of the gist.

  As described above, the present invention is useful for a method for manufacturing a non-reciprocal circuit device, and is particularly excellent in that the assembly process is facilitated and mass productivity is improved.

DESCRIPTION OF SYMBOLS 10 ... Ferrite magnet element 10 '... Collective substrate 11 ... Ferrite 15 ... Permanent magnet 21 ... Metal material 25 ... Resin material containing magnetic powder

Claims (2)

A non-reciprocal circuit device comprising a ferrite magnet element in which a central electrode is disposed on at least one main surface of a ferrite having a pair of opposed main surfaces, and a permanent magnet is fixed to each of the pair of main surfaces of the ferrite. In the manufacturing method,
Bonding a metal material having magnetism to the upper and lower surfaces of an aggregate substrate in which ferrite is sandwiched between a pair of permanent magnets;
Cutting the aggregate substrate to which the metal material is bonded into one unit of ferrite / magnet element;
Filling and curing a resin material containing magnetic powder between the cut surfaces of the cut one unit ferrite-magnet element; and
Cutting the filled and cured resin material at a substantially central portion in the thickness direction;
A method for manufacturing a non-reciprocal circuit device, comprising:   The method for manufacturing a nonreciprocal circuit device according to claim 1, wherein the metal material is disposed on a surface facing the main surface of the permanent magnet.

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