JP2012165063A - Ferrite magnet element and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a ferrite magnet element and a manufacturing method therefor, capable of handling a yoke integrally with ferrite and a permanent magnet instead of an independent article.SOLUTION: By the disposition of a center electrode on at least one principal plane of a ferrite 32 having a pair of principal planes facing each other, a ferrite magnet element 30 is formed of permanent magnets 41A, 41B fastened on the pair of principal planes of the ferrite 32. The ferrite magnet element 30 includes: a planer-shaped magnetic substance 51 fastened, through an adhesive 43, on the principal plane 41a of the permanent magnet 41A not facing the ferrite 32; and from a principal plane 41b of the permanent magnet 41B not facing the ferrite 32, a U-shaped magnetic plate 52 fastened through an adhesive 44 to both end face 43b of the permanent magnet 41B, both end face of the ferrite 32 and both end face 43c of the permanent magnet 41A.

Description

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

  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

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a ferrite magnet element that can handle a yoke integrally with a ferrite or a permanent magnet, and not a separate product, and a method for manufacturing the same.

The ferrite magnet element which is the first embodiment of the present invention is
In 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 the first and second permanent magnets are fixed to the pair of main surfaces of the ferrite, respectively.
A planar magnetic plate fixed to the main surface not facing the ferrite of the first permanent magnet via an adhesive;
A U-shape that is fixed to the both end surfaces of the second permanent magnet, both end surfaces of the ferrite, and both end surfaces of the first permanent magnet with an adhesive from the main surface not facing the ferrite of the second permanent magnet. Type magnetic plate,
It is provided with.

The method for producing a ferrite magnet element according to the second embodiment of the present invention is as follows.
Manufacture of a ferrite-magnet element in which a center electrode is disposed on at least one main surface of a ferrite having a pair of opposed main surfaces, and first and second permanent magnets are fixed to the pair of main surfaces of the ferrite, respectively. In the method
Producing a collective substrate in which ferrite is sandwiched between first and second permanent magnets;
A step of fixing a planar magnetic plate to the main surface of the first permanent magnet not facing the ferrite via an adhesive;
Cutting the collective substrate into a strip-shaped substrate including a planar magnetic plate;
Applying an uncured adhesive to the main surface of the strip-shaped substrate that is not opposed to the ferrite of the second permanent magnet;
The U-shaped magnetic plate is moved from the main surface not facing the ferrite of the second permanent magnet to which the uncured adhesive is applied to the both end surfaces of the second permanent magnet, both end surfaces of the ferrite, and the first permanent magnet. Fixing to both end faces of the magnet;
Cutting the strip substrate into a unit of ferrite / magnet element including a planar magnetic plate and a U-shaped magnetic plate;
It is provided with.

  In the ferrite magnet element, the integrated ferrite and a pair of permanent magnets are surrounded by a planar magnetic plate and a U-shaped magnetic plate, and these magnetic plates function as a yoke and are generated from the permanent magnet. Prevents leakage of magnetic flux. In the manufacturing process, first, a flat substrate is cut into a strip-shaped substrate on a collective substrate formed by the first permanent magnet and the second permanent magnet respectively disposed on both main surfaces of the ferrite. The U-shaped magnetic plate is fixed to the strip-shaped substrate, and finally cut into one unit of ferrite / magnet element. Therefore, the planar magnetic plate and the U-shaped magnetic plate are integrated with the ferrite and the permanent magnet in a state where the unit is a ferrite / magnet element. In other words, the planar magnetic plate and the U-shaped magnetic plate are assembled to the ferrite / magnet element during the manufacturing process of the ferrite / magnet element, and there is no need for a separate assembling process. Will improve.

  According to the present invention, the yoke can be handled integrally with the ferrite and the permanent magnet, not as an individual product, and as a result, the mass productivity of the nonreciprocal circuit element is improved.

The ferrite magnet element which is one Example is shown, (A) is a perspective view, (B) is an exploded perspective view of the principal part. It is a disassembled perspective view of the principal part of the said ferrite magnet element. It is explanatory drawing which shows the manufacturing process (bonding process) of the said ferrite magnet element. It is explanatory drawing which shows the manufacturing process (strip shape cut process) of the said ferrite magnet element. It is a perspective view which shows the manufacturing process (adhesive application | coating process) of the said ferrite magnet element. It is a perspective view which shows the manufacturing process (U-shaped magnetic board attachment process) of the said ferrite magnet element.

  Embodiments of a ferrite magnet element and a method for manufacturing the same 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.

  As shown in FIG. 1, the ferrite magnet element 30 according to one embodiment is one element constituting a non-reciprocal circuit element. As the non-reciprocal circuit element, a circuit board (not shown) other than this element is used. And exterior resin, and inductors and capacitors mounted as necessary. Note that the basic configuration of the ferrite / magnet element 30 (non-reciprocal circuit element) that can be manufactured using the present invention has various aspects from the past, and a lumped constant type isolator is disclosed in Patent Document 1 described above. There can be mentioned the two-port isolator described.

  As shown in FIG. 2, the two-port isolator (ferrite / magnet element 30) intersects a ferrite 32 to which a DC magnetic field is applied by a pair of permanent magnets 41A and 41B and the ferrite 32 in an insulated state. The first center electrode 35 and the second center electrode 36 are provided. The first center electrode 35 is wound around the ferrite 32 by one turn, and one end electrode 35a is an input port P1 and the other end electrode 35b is an output port P2. The second center electrode 36 is wound four turns (the number of turns is arbitrary) with the ferrite 32 intersecting the first center electrode 35 at a predetermined angle, and one end electrode (shared with the other end electrode 35b). ) Is the output port P2, and the other end electrode 36a is the ground port P3. In FIG. 2, the illustration of the electrode on the back side of the ferrite 32 is omitted to avoid complication.

  Further, a termination resistor (not shown) is connected between the input port P1 and the output port P2 in parallel with the first center electrode 35, and a first matching capacitor (not shown) is connected between the input port P1 and the output port P2. A second matching capacitor (not shown) is connected between the output port P2 and the ground port P3.

  The ferrite 32 provided with the first and second center electrodes 35 and 36 is configured as a ferrite-magnet element 30 having both main surfaces sandwiched by a pair of permanent magnets 41A and 41B via an adhesive 42. ing. The termination resistor and the capacitor are configured as separate parts from the ferrite / magnet element 30.

  The non-reciprocal circuit element may be a three-port type isolator described in Patent Document 2, or a magnetic resonance type isolator.

  As shown in FIG. 1, a planar magnetic plate 51 and a U-shaped magnetic plate 52 are disposed around the ferrite-magnet element 30, and the magnetic plates 51, 52 function as yokes, and permanent magnets 41A, 41B. Prevents leakage of magnetic flux generated from Specifically, the planar magnetic plate 51 is fixed to the main surface 41a of the permanent magnet 41A that is not opposed to the ferrite 32 via an adhesive 43. The U-shaped magnetic plate 52 has an adhesive 44 applied from the main surface 41b of the permanent magnet 41B not facing the ferrite 32 to both end surfaces 43b of the permanent magnet 41B, both end surfaces of the ferrite 32, and both end surfaces 43c of the permanent magnet 41A. It is fixed through.

  The magnetic plates 51 and 52 can use Ni, SPCC, or the like. As the adhesive 43, an epoxy resin is used as a sheet as described below. An epoxy resin is also used as the adhesive 44 and is applied in an uncured state as described below. Conventionally known materials are used for the ferrite 32, the permanent magnets 41A and 41B, and the adhesive 42.

  Here, the manufacturing process of the ferrite magnet element 30 will be described with reference to FIGS. First, as shown in FIG. 3, a collective substrate 30 </ b> A is produced in which ferrite 32 having center electrodes 35 and 36 formed on the surface is sandwiched between permanent magnets 41 </ b> A and 41 </ b> B. Next, the planar magnetic plate 51 is bonded to the main surface 41a of the permanent magnet 41A that is not opposed to the ferrite 32 via the sheet-like adhesive 43. Here, the collective substrate 30 </ b> A is a substrate for multi-cavity, which is usually employed in this type of element manufacturing method.

  Next, the aggregate substrate 30A is inverted from the state of FIG. 3, temporarily fixed on the dicing sheet 60 as shown in FIG. 4, and the aggregate substrate 30A including the planar magnetic plate 51 is strip-shaped substrate 30B ( Cut (dicing) in FIG. The cutting at this time is performed in the direction of the arrow X shown in FIGS. 1A and 3 at the interval W1 shown in FIGS. 1A, 4 and 5.

  Next, the adhesive 44 is applied in an uncured state on the main surface 41b of the strip-shaped substrate 30B cut as described above and not facing the ferrite 32 of the permanent magnet 41B (see FIG. 5). Then, as shown in FIG. 6, a U-shaped magnetic plate is applied to each strip-shaped substrate 30B, the main surface 41b of the permanent magnet 41B coated with the uncured adhesive 44, the both end surfaces 43b of the permanent magnet 41B, and the ferrite 32. Are attached along both end faces 43c of the permanent magnet 41A and fixed with an adhesive 44. At this time, since the adhesive 44 applied on the main surface 41b is in an uncured state, it flows from the main surface 41b to the end surface as the U-shaped magnetic plate 52 is attached.

  Next, the strip-shaped substrate 30 </ b> B including the planar magnetic plate 51 and the U-shaped magnetic plate 52 is cut (diced) into one unit of ferrite / magnet element 30. The cutting at this time is performed in the arrow Y direction shown in FIG. 6 at the interval W2 shown in FIG. 1 (A) and FIG. Through the above steps, the ferrite / magnet element 30 shown in FIG. 1A is obtained.

  The ferrite magnet element 30 manufactured as described above is a unit of ferrite magnet element 30, and the planar magnetic plate 51 and the U-shaped magnetic plate 52 are integrated with the ferrite 32 and the permanent magnets 41A and 41B. Has been. In other words, the planar magnetic plate 51 and the U-shaped magnetic plate 52 are assembled to the ferrite / magnet element 30 during the manufacturing process of the ferrite / magnet element 30 and do not require a separate assembling process. Therefore, the manufacturing process of the non-reciprocal circuit element is simplified and the mass productivity is improved.

  The ferrite / magnet element and the manufacturing method thereof according to the present invention are not limited to the above-described embodiments, and can be variously modified within the scope of the gist thereof.

  As described above, the present invention is useful for a ferrite / magnet element and a method for manufacturing the same, and is particularly excellent in that the assembly process is facilitated and mass productivity is improved.

DESCRIPTION OF SYMBOLS 30 ... Ferrite magnet element 30A ... Aggregate substrate 30B ... Strip-shaped substrate 35, 36 ... Center electrode 41A, 41B ... Permanent magnet 41a, 41b ... Main surface 43, 44 ... Adhesive 51 ... Planar magnetic plate 52 ... U-shaped Magnetic plate

Claims (2)

In 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 the first and second permanent magnets are fixed to the pair of main surfaces of the ferrite, respectively.
A planar magnetic plate fixed to the main surface not facing the ferrite of the first permanent magnet via an adhesive;
A U-shape that is fixed to the both end surfaces of the second permanent magnet, both end surfaces of the ferrite, and both end surfaces of the first permanent magnet with an adhesive from the main surface not facing the ferrite of the second permanent magnet. Type magnetic plate,
A ferrite magnet element characterized by comprising: Manufacture of a ferrite-magnet element in which a center electrode is disposed on at least one main surface of a ferrite having a pair of opposed main surfaces, and first and second permanent magnets are fixed to the pair of main surfaces of the ferrite, respectively. In the method
Producing a collective substrate in which ferrite is sandwiched between first and second permanent magnets;
A step of fixing a planar magnetic plate to the main surface of the first permanent magnet not facing the ferrite via an adhesive;
Cutting the collective substrate into a strip-shaped substrate including a planar magnetic plate;
Applying an uncured adhesive to the main surface of the strip-shaped substrate that is not opposed to the ferrite of the second permanent magnet;
The U-shaped magnetic plate is moved from the main surface not facing the ferrite of the second permanent magnet to which the uncured adhesive is applied to the both end surfaces of the second permanent magnet, both end surfaces of the ferrite, and the first permanent magnet. Fixing to both end faces of the magnet;
Cutting the strip substrate into a unit of ferrite / magnet element including a planar magnetic plate and a U-shaped magnetic plate;
A method for producing a ferrite / magnet element, comprising:

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