JP2001292014A - Manufacturing method of irreversible circuit element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of an irreversible circuit element that can enhance the connection reliability, the workability and the productivity at the time of manufacturing. SOLUTION: This manufacturing method for the irreversible circuit element has an assembly provided with a magnetic yoke, a permanent magnet, a center conductor and a magnetic body, and an elastic resin member that is characterized in that an adhesive layer is provided to one major side of the permanent magnet, a compound of the permanent magnet and the elastic resin member is placed in metallic dies, vulcanization forming is applied thereto and the elastic resin member and the permanent magnet are adhered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a non-reciprocal circuit device having a non-reciprocal transmission characteristic for a high-frequency signal.

[0002]

2. Description of the Related Art Hitherto, non-reciprocal circuit devices such as isolators and circulators have been known as one of transmission / reception circuit components used in a microwave band and a UHF band for mobile phones, automobile phones and the like. The structure and manufacturing method of such a non-reciprocal circuit device will be described below.

FIG. 5 is an exploded perspective view showing the structure of an isolator. This isolator has an upper yoke 1, a magnet 2,
It comprises an assembly 20, plate capacitors 8, 9, and 10, a dummy resistor 11, a resin case 7, and a lower yoke 12. The assembly 20 radially extends from the disk-shaped shield plate.
A ferrite disk (magnetic material) 3 is disposed on a conductive plate having a structure in which three center conductors 4, 5, and 6 protrude.
5 and 6 are formed by bending and overlapping in an insulating state.

The resin case 7 has a structure in which a conductor plate of about 0.1 mm and an engineering plastic having heat resistance are integrally formed, and has a circular concave portion 13a in the center of which an assembly 20 is disposed. Concave portions 13b, 13c, 13 around which plate capacitors and dummy resistors are arranged
d. The bottom of these recesses 13b, 13c, 13d and the recess 13a in which the assembly 20 is arranged, the input / output port 1
The connection electrodes 6b and 16c are formed of the conductor plates. External terminals are formed on the outer surface of the side wall of the resin case 7. The recess 13 of the resin case 7
Plate capacitors 8, 9, and 10 having electrodes formed on the upper and lower surfaces are inserted into b, 13c, and 13d, respectively, and the electrodes on the lower surface and the connection electrodes 14a formed on the bottom of the concave portion are connected by soldering. The dummy resistor 11 is disposed in the recess 13b, and one electrode of the dummy resistor 11 is connected to the connection electrode 14a by soldering.

[0005] Next, the above-described assembly 20 is disposed in the recess 13 a of the resin case 7. At this time, the disk-shaped shield plate of the central conductor is soldered to the connection electrode 14a. Thereby, one end of the center conductor is grounded. One end of the center conductor 4 is connected to an electrode on the upper surface of the plate capacitor 8 and one terminal electrode of the dummy resistor 11. One end of the center conductor 5 is connected to an electrode on the upper surface of the plate capacitor 9 and the input / output port 16b. One end of the center conductor 6 is connected to an electrode on the upper surface of the plate capacitor 10 and the input / output port 16c.

Then, the resin case 7 is arranged on the lower yoke 12. The lower yoke 12 has a structure that matches the concave portion 18 at the bottom of the resin case 7, and the lower yoke 12 and the back surface of the connection electrode 14a are connected by soldering. The connection between the lower yoke 12 and the resin case 7, the connection between the resin case 7 and the assembly 20, and the connection between the plate capacitors 8, 9 and 10 and the input / output ports 16 b and 16 c are performed, for example, by cream soldering at a predetermined position. Is applied and then soldered in a reflow furnace. At this time, each component is mechanically fixed with a holding jig or the like in advance so that the connection between each component can be performed reliably. Generally, soldering is performed.

After soldering between the components, the protrusion 100 on the side wall of the upper yoke 1 to which the magnet 2 is fixed is attached to the lower yoke 1
2 is inserted into the notch 101, the upper yoke 1 is turned around the corresponding portion as a fulcrum, and the protrusion 10 formed on the other side wall is rotated.
0 and the notch 101 are fitted together to form an isolator.

[0008]

As described above, in the conventional method for manufacturing a non-reciprocal circuit device, each component is previously machined with a holding jig or the like so that the connection between the components can be performed with high reliability. It is necessary to solder in a fixed state. For this reason, the assembly of the non-reciprocal circuit device becomes complicated, and it goes without saying that a large number of man-hours are required for manufacturing, and automation for improving productivity is also difficult. In view of the above, the present inventors have intensively studied and came up with a method of mechanically fixing each component by disposing an elastic resin member between the permanent magnet and each component. However, there has been a remarkable reduction in the size of non-reciprocal circuit devices in recent years, and their external dimensions are extremely small, such as 5 mm x 5 mm x 1.7 mm. is there. FIG. 3 is a perspective view of the elastic resin member. Its outer dimensions are 4 mm × 4 mm, and its thickness is only about 0.5 mm in the convex portion and about 0.1 mm in the thin portion. Even if the elastic resin member 50 is located at a desired position,
It is very difficult to dispose the elastic resin members 50, and there are many obstacles in the mechanization, and in the present situation where the size of the non-reciprocal circuit device is reduced, it becomes more difficult to handle the elastic resin members 50 individually. Was evident. Therefore, an object of the present invention is to solve the above-mentioned problems, to prevent misalignment or floating of each component element, to improve connection reliability, and to improve workability and productivity during manufacturing. It is an object of the present invention to provide a method of manufacturing a non-reciprocal circuit device capable of performing the above.

[0009]

SUMMARY OF THE INVENTION The present invention provides an assembly comprising a magnetic yoke, a permanent magnet, a center conductor and a magnetic material,
A method for manufacturing a non-reciprocal circuit device having an elastic resin member, wherein an adhesive layer is provided on one main surface of the permanent magnet, a compound of the permanent magnet and the elastic resin member is arranged in a mold, and vulcanization molding is performed. A method for manufacturing a non-reciprocal circuit device for performing bonding between an elastic resin member and a permanent magnet. In the present invention, when the elastic resin member has a convex portion, it is preferable that the convex portion of the elastic resin member is formed by a concave portion provided in the mold in vulcanization molding. Preferably, the elastic resin member is a resin material having an international rubber hardness of 10 to 100 specified in JIS K 6250.

[0010]

FIG. 1 is an exploded perspective view showing an entire configuration of a non-reciprocal circuit device (isolator) according to an embodiment of the present invention. FIG. 2 is a plan view (a) and a sectional view (b). It is. As shown in FIG. 1, an isolator according to an embodiment of the present invention includes a permanent magnet 2 between an upper yoke 1 and a lower yoke 12, an assembly 20 having a center conductor and a magnetic body, and is bonded to the permanent magnet 2. Elastic resin member 50 (silicone rubber)
, A resin case 7, and openings 200, 201, 202, and 203 on the side wall of the lower yoke 12, and the openings 200, 201, 20 on the side wall of the upper yoke 1.
2, 203, the projections 204, 205, 206,
207 (206 and 207 are not shown) are formed, and are configured by fitting upper and lower yokes. At this time, the elastic resin member 50 is in a state of being elastically deformed in the thickness direction. The upper and lower yokes are locked by the projections and the apertures, and each component element is pressed as shown in FIG. In addition, a force in the thickness direction is applied to each component. With this configuration, misalignment and lifting of the components are prevented, and the reliability of the connection is improved. It is sufficient that the permanent magnet 2 and the elastic resin member 50 maintain an adhered state during assembly, and the permanent magnet 2 and the elastic resin member 50 may be separated after the upper and lower yokes are locked. Therefore, it is not particularly necessary to select an adhesive or the like for bonding, but in consideration of performing vulcanization molding and performing soldering in a reflow furnace,
It is desirable to use an acrylic or epoxy heat-resistant adhesive.

Hereinafter, a method for manufacturing a non-reciprocal circuit device according to one embodiment of the present invention will be described. However, the method for manufacturing a non-reciprocal circuit device according to this embodiment has many similarities to the conventional manufacturing method, and thus differs therefrom. Only the part will be described.

First, on the lower yoke 12, the resin case 7 in which the assembly 20, the plate capacitors 8, 9, 10 and the dummy resistor 11 are inserted at predetermined positions is arranged. Joint between lower yoke 12 and resin case 7, joint between resin case 7 and assembly 20, plate capacitors 8, 9, 10, input / output port 1
A cream solder is applied to the connection portions and the like with 6b and 16c. Then, the structure 60 obtained by bonding and integrating the elastic resin member 50 and the permanent magnet 2 prepared in advance is replaced with the convex portion of the elastic resin member 50, the concave portion 13b of the resin case,
13c, 13d, the upper yoke 1 is pushed into the lower yoke 12, and the projection of the upper yoke is fitted into the opening of the lower case. With the member 50 elastically deformed, the upper and lower cases were locked. With this configuration, the permanent magnet 2 and the upper yoke 1, the assembly 20 and the resin case 7, the resin case 7 and the lower yoke 12 are mechanically fixed, and the central conductor 4 is formed by the convex portion of the elastic resin member. , 5
6, the plate capacitors 8, 9, 10 and the dummy resistor 11 are pressed and fixed. Then, an isolator was manufactured by reflow soldering in a high-temperature atmosphere.

The integration of the permanent magnet 2 and the elastic resin member 50 is carried out by vulcanization molding with a compound of silicon rubber and a permanent magnet coated with an adhesive in a vulcanizing mold. In the case of this embodiment, the vulcanization treatment is performed at 150 ° C. for 5 minutes, but the vulcanization treatment conditions may be appropriately selected depending on the resin material and shape of the elastic resin member. In addition, the mold is provided with a concave portion, whereby a convex portion of the elastic resin member can be formed when vulcanization is performed. As the elastic resin member, JIS K 6250
It is desirable that the resin material is a resin material having an international rubber hardness of 10 to 100 as defined in the above. International rubber hardness less than 10, 10
If it exceeds 0, it is not preferable because elasticity sufficient to mechanically and integrally fix the components of the nonreciprocal circuit device cannot be obtained. After the vulcanization step is completed, the remaining portion of the elastic resin member is cut by a punching die and released to obtain a structure 60 in which the permanent magnet and the elastic resin member are bonded and integrated.

[0014]

According to the present invention, it is possible to prevent misalignment or floating of each component element, thereby improving the reliability of connection and improving the workability and productivity during manufacturing. A method for manufacturing a circuit element can be provided.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an entire configuration of a non-reciprocal circuit device according to one embodiment of the present invention.

FIG. 2A is a plan view of a non-reciprocal circuit device according to one embodiment of the present invention, and FIG. 2B is a cross-sectional view of the non-reciprocal circuit device according to one embodiment of the present invention.

FIG. 3 is a perspective view of an elastic resin member.

FIG. 4 is a perspective view of a structure in which an elastic resin member and a permanent magnet are bonded and integrated.

FIG. 5 is an exploded perspective view showing the entire configuration of a conventional non-reciprocal circuit device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper yoke 2 Magnet 3 Magnetic body 4, 5, 6 Center conductor 7 Resin case 8, 9, 10 Plate capacitor 11 Dummy resistor 12 Lower yoke 50 Elastic resin member

Claims (3)

[Claims] 1. A method for manufacturing a non-reciprocal circuit device having a magnetic yoke, a permanent magnet, an assembly including a center conductor and a magnetic material, and an elastic resin member, wherein the method includes bonding to a main surface of the permanent magnet. A method for manufacturing a non-reciprocal circuit device, comprising providing a layer, placing a compound of the permanent magnet and an elastic resin member in a mold, performing vulcanization molding, and bonding the elastic resin member and the permanent magnet. 2. The elastic resin member has a substantially plate shape and is provided with a convex portion on at least a part of a peripheral portion thereof, and a convex portion of the elastic resin member is formed by a concave portion provided in the mold in vulcanization molding. The method for manufacturing a non-reciprocal circuit device according to claim 1, wherein: 3. The elastic resin member according to JIS K 625.
3. The method for producing a non-reciprocal circuit device according to claim 1, wherein the resin material has an international rubber hardness of 10 to 100 defined by 0.