JPH0514024A - Method for manufacturing dielectric resonator - Google Patents

Abstract

(57) [Summary] [Objective] A method for manufacturing a dielectric resonator is provided, which enables automation by assembling a plurality of dielectric resonators instead of assembling them one by one. [Structure] The strip-shaped metal plate is punched so that a plurality of plate-shaped lead portions connected to the tie-bars of the strip-shaped metal plate and a molded portion including locking protrusions connected to the plate-shaped lead portions are formed in parallel. The first step, the second step of molding the portion to be molded with a dielectric substance, the third step of forming a conductive film on at least the inner and outer peripheral surfaces of the dielectric block having the through holes, and the second step of molding. It comprises a fourth step of press-fitting the molded part into the resonance hole of the dielectric block and a fifth step of separating a part of the plate-shaped lead part from the tie bar.

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 dielectric resonator used for micro communication such as a car phone, a mobile phone, or satellite communication.

[0002]

2. Description of the Related Art A conventional method of manufacturing a dielectric resonator will be described with reference to FIGS. FIG. 9 is an external view of a conventional dielectric resonator. FIG. 10 is a cross-sectional view of a conventional dielectric resonator. Figure 1
Reference numeral 1 is an equivalent circuit of the dielectric resonator. 9 and 10
In the above, the dielectric block 51 is a dielectric substance made of ceramic such as barium titanate (BaTiO ₃ ), for example, and has two through holes formed therein. An internal electrode 53 is formed on the entire surface of the dielectric block 51 except the open end surface, that is, an inner surface of the through hole, an external electrode 54 is formed on four peripheral surfaces of the dielectric block 51, and a bottom electrode 55 is formed on the bottom. As a method of forming these electrodes, for example, a silver paste is applied to the surface of the dielectric block 51 and the inner surface of the resonance hole 52 and then baked to obtain a thick silver film.
Another electrode forming method is to print or apply a resist on the open end of the dielectric block 51 and then perform plating.
Then, finally, the resist is removed.

On the other hand, a lead wire 41 attached as an input / output terminal to the resonance hole 52 of the dielectric block 51 is press-fitted into the resonance hole 52 via a resin mold portion 42 made of, for example, Teflon resin. That is, the resin mold portion 42 having the lead wire 41 is composed of the lid portion 43 and the insertion portion 44, and the insertion portion 44 is press-fitted into the resonance hole 52 of the dielectric block 51. In the dielectric block 51, the internal electrode 53 and the external electrode 54 or the bottom electrode 55 form a 1/4 · λ type distributed constant dielectric resonator. In addition, the lead wire 41 and the internal electrode 53 of the dielectric block 51.
In and, capacitors for input and output are formed.

In FIGS. 10 and 11, one lead wire 41 serves as an input terminal 64, and dielectric resonators 61 and 6 are provided.
The other lead wire 41 'passing through 2 becomes the output terminal 68. Then, the dielectric resonators 61 and 62 and the lead wire 4
The characteristics of the filter composed of 1 and 41 'are the material of the dielectric block 51 and the resin mold portion 42, the shape and size of the dielectric block 51 and the resonance holes 52 and 52', or the resonance hole 52 and the resonance hole. Electromagnetic coupling with 52 '6
Determined by 3 mag.

[0005]

However, the terminals of the dielectric resonators 61 and 62 as shown in FIGS. 9 and 10 are
It was made by inserting the lead wires 41 into the resin mold portion 42 one by one. In addition, the terminal portions thus created were press-fitted into the resonance holes 52 of the dielectric block 51 one by one. In recent years, the size of the dielectric resonator tends to decrease as the frequency used for the dielectric resonator increases. There have been many difficulties in automating the manufacture of such a dielectric resonator that tends to be miniaturized.

The present invention is intended to solve the above problems, and when assembling dielectric resonators, the dielectric resonators can be automated by assembling a plurality of dielectric resonators instead of assembling them one by one. It aims at providing the manufacturing method of.

[0007]

In order to achieve the above object, a method of manufacturing a dielectric resonator according to the present invention comprises a plurality of plate-shaped lead portions connected to a tie bar of a strip-shaped metal plate, and the plate-shaped lead portions. A first step of punching a strip-shaped metal plate so as to form in parallel a molded part including locking protrusions connected to the lead part, and molding a plurality of molded parts including the locking protrusions with a dielectric material. A dielectric block obtained by the second step, a third step of forming a conductive film on at least the inner and outer peripheral surfaces of the dielectric block having a through hole, and a mold part molded by the second step in the third step. The fourth step of press-fitting into the resonance hole and the fifth step of separating a part of the plate-shaped lead portion from the tie bar. Further, the method for manufacturing a dielectric resonator according to the present invention comprises a plate-shaped lead part connected to one tie bar of the band-shaped metal plate, and a molded part including a locking protrusion continuous with the plate-shaped lead part. A first step of connecting to the other tie bar of the metal plate and punching the metal plate so as to form a plurality of the plate-shaped lead portions and the molded portion in parallel by turning between the tie bars; The second step of cutting a part of the molded portion including the locking protrusions connected to the linear lead portion, the third step of molding a plurality of molded portions including the locking protrusions with a dielectric substance, and A fourth step of forming a conductive film on at least the inner and outer peripheral surfaces of the dielectric block having holes, a fifth step of press-fitting the mold part molded by the third step into the resonance holes of the dielectric block, and a plate shape Part of lead part Composed of a sixth step of disconnecting from said tie bar.

[0008]

[Operation] A large number of plate-shaped lead portions connected to the tie bars and a molded portion including locking projections connected to the plate-shaped lead portions are obtained by punching a strip-shaped metal plate. Then, the part to be molded including the locking protrusion is resin-molded. In this way, the plate-shaped lead portions connected by the tie bars are suitable for molding a plurality of pieces at once. Further, since the terminal portion in which the plate-shaped lead portion is molded is connected to each other by the tie bar and supports each other to maintain the strength, the terminal portion has a strength enough to be pressed into the resonance hole of the dielectric resonator at a time. . Furthermore, since the locking protrusion is formed on the molded portion, the plate-shaped lead portion does not come off from the molded portion when the terminal portion is press-fitted into the resonance hole of the dielectric resonator. In addition, the strip-shaped metal plate is effectively used by connecting the upper and lower tie bars by changing the direction of the molded portion including a large number of plate-shaped lead portions and locking projections connected to the plate-shaped lead portions in a vertically symmetrical manner. You can also do it. As described above, since the plurality of lead wires are integrally formed as a lead frame, handling at the time of automation becomes easy.

[0009]

EXAMPLE An example of the present invention will be described with reference to FIGS. FIG. 1 shows a lead frame for explaining an embodiment of the present invention. FIG. 2 is an explanatory diagram showing a state in which the plate-shaped lead portions in FIG. 1 are alternately separated. Figure 3
FIG. 3 is an explanatory diagram of a mold part that is an embodiment of the present invention.
FIG. 4 is an explanatory view of an embodiment in the case of two plate-shaped leads. FIG. 5 is a bottom view of FIG. FIG. 6 is an explanatory view of an embodiment in which the mold portion shown in FIG. 4 is press-fitted into the resonance hole of the dielectric resonator. FIG. 7 is a bottom view of FIG. FIG. 8 is an explanatory view of a state in which the tie bar in FIG. 6 is separated. In FIG. 1, the strip-shaped metal plate is a molded portion including a plate-shaped lead portion 15 connected to one tie bar 12 and a plate-shaped lead portion 15 connected to the other tie bar 13 and including a locking projection portion 17. The lead frame 11 is punched out. In addition, the lead frame 11 includes a plate-shaped lead portion 15 and a locking protrusion portion 17.
As shown in FIG. 1, the to-be-molded portion 16 including the above is continuously formed by changing its direction alternately. Plate-shaped lead portion 15
1 and the molded part 16 including the locking projections 17 have the same orientation except that shown in FIG. 1, or the plate-shaped lead part 15 and the molded part 16 including the locking projections 17 are vertically symmetrical. It is also possible to form. When the plate-shaped lead portion 15 and the molded portion 16 including the locking protrusion 17 are formed symmetrically in this way, the base portion 1 of the molded portion 16 is formed.
8 is the middle of the lead frame 11 in the width direction. The lead frame 11 is formed with feed holes 14 at equal intervals for guiding and positioning before punching by press working.

Next, the base portion 18 of the molded portion 16 connected to the tie bars 12 and 13 is cut so that two lead frames 11 shown in FIG. 2 are obtained. Next, the molded portion 16 including the locking protrusion 17 in the lead frame 11 shown in FIG. 2 is resin-molded. The resin is made of a dielectric material such as polyphenylene sulfide resin. In addition, the mold portion 21 molded with resin is used as the resonance hole 3 of the dielectric block 31.
2 (see FIG. 6), the lid portion 22 when press-fitted, the insertion portion 23 inserted into the resonance hole 32, and the resonance hole 32 firmly when the insertion portion 23 is inserted into the resonance hole 32. It is composed of a plurality of locking projections 25 for fixing. Further, when the dielectric block 31 has a plurality of resonance holes 32, the lid portions 22 of the mold portion 21 are connected to each other by the connecting portions 24. With this connecting portion 24, as can be seen from FIG. 3, FIG. 4 or FIG. 6, the mold portion 21 is the connecting portion 2 between the tie bar 12 and the mold portion 21.
Since it is more firmly connected to the mold 4,
This facilitates the work for press-fitting into the resonance hole 32 of the dielectric block 31. Especially when performing automation, the tie bar 1
A firm connection between the 2 and the connection 24 is required.

FIG. 4 shows the case where there are two mold portions 21, and FIG. 5 is a bottom view thereof. Then, the insertion portion 23 of the mold portion 21 is press-fitted into the resonance hole 32 of the dielectric block 31. FIG. 7 is a bottom view after the mold portion 21 is press-fitted into the resonance hole 32, but the locking projection 25 formed in the insertion portion 23 bites into the dielectric block 31. After that, the base portion 19 of the plate-shaped lead portion 15 is separated from the tie bar 12, and the dielectric resonator is obtained.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments. And
Various design changes can be made without departing from the present invention described in the claims. For example, in this embodiment, as shown in FIGS. 3 to 5, a set of two plate-shaped lead portions is shown, but the number is not limited to this, and a large number may be used. Further, the shape of the dielectric block is not limited to this embodiment. Further, a coaxial type or two or more stages of dielectric resonator may be used.
Further, the end of the molded part may protrude from the mold part.

[0013]

According to the present invention, it is possible to press fit the mold part and the resonance hole of the mold part in a state where the mold part is connected to the tie bar of the lead frame. Improved. Further, since the locking projection is formed on the mold portion of the plate-shaped lead portion, the mold portion is easily press-fitted into the resonance hole and is firmly fixed.

[Brief description of drawings]

FIG. 1 shows a lead frame for explaining an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a state in which the plate-shaped lead portions in FIG. 1 are alternately separated.

FIG. 3 is an explanatory diagram of a mold portion that is an embodiment of the present invention.

FIG. 4 is an explanatory diagram of an embodiment in the case of two plate-shaped leads.

FIG. 5 is a bottom view of FIG.

FIG. 6 is an explanatory view of an example of a state in which the mold portion shown in FIG. 4 is press-fitted into a resonance hole of a dielectric resonator.

FIG. 7 is a bottom view of FIG.

FIG. 8 is an explanatory diagram of a state in which the tie bar in FIG. 6 is separated.

FIG. 9 is an external view of a dielectric resonator according to a conventional example.

FIG. 10 is a cross-sectional explanatory view of a dielectric resonator in a conventional example.

FIG. 11 is an equivalent circuit of a dielectric resonator.

[Explanation of symbols]

11 Lead Frame 21 Molded Part 12, 13 Tie Bar 22 Lid Part 14 Feeding Hole 23 Insertion Part 15 Plate Lead Part 24 Connecting Part 16 Molded Part 25 Locking Protrusion 17 Locking Protrusion 31 Dielectric Block 18, 18'19 Base 32 Resonance hole

Claims (2)

[Claims] 1. A plurality of plate-shaped lead portions (15) connected to a tie bar (12) of a strip-shaped metal plate, and the plate-shaped lead portions (15).
The first step of punching out the strip-shaped metal plate so as to form in parallel the molded part 16 including the locking projections 17 connected to each other, and the plurality of molded parts 16 including the locking projections 17 made of a dielectric material. The second step of molding, the third step of forming a conductive film on at least the inner and outer peripheral surfaces of the dielectric block 31 having the through holes, and the mold portion 21 molded by the second step are obtained by the third step. And a fifth step of separating a part of the plate-shaped lead portion 15 from the tie bar 12, and a fourth step of press-fitting into the resonance hole 32 of the dielectric block 31, and a method of manufacturing a dielectric resonator. . 2. The plate-shaped lead portion 15 connected to one of the tie bars 12 of the strip-shaped metal plate and the molded portion 16 including a locking projection 17 continuous with the plate-shaped lead portion 15 are provided on the other side of the strip-shaped metal plate. Connecting to the tie bar 13 and punching a metal plate so as to form a plurality of the plate-shaped lead portions 15 and the molded portion 16 in parallel with each other between the tie-bars, and the plate-shaped leads. A second step of cutting a portion 18 of the molded portion 16 including the locking protrusions 17 connected to the portion 15, and a third step of molding the plurality of molded portions 16 including the locking protrusions 17 with a dielectric substance. And a fourth step of forming a conductive film on at least the inner and outer peripheral surfaces of the dielectric block 31 having a through hole, and a molding portion 21 molded by the third step, which causes resonance of the dielectric block 31. A fifth step of press-fitting to 32, wherein a portion 19 of the plate-like lead section 15 tie bar 12, 13
6. A method for manufacturing a dielectric resonator, which comprises: