JP2752263B2 - Method of manufacturing surface mount type dielectric filter and terminal frame - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a dielectric filter and a terminal frame, and more particularly to a method of manufacturing a surface mount type dielectric filter and a terminal frame for carrying out the method.

[0002]

2. Description of the Related Art For example, a surface mount type dielectric filter which can be directly mounted on a circuit board is used as a high frequency filter of a communication device. The surface mount type dielectric filter includes a metal plate having a ground terminal, a dielectric filter main body disposed on the metal plate, an input / output terminal extending from an input / output unit of the dielectric filter main body, and a dielectric filter main body. And a box-shaped metal case that covers the metal plate on the metal plate, and the ground terminal and the input / output terminal of the metal plate are arranged on the same plane. This surface mount type dielectric filter is mounted on a circuit board on which solder cream is printed. Here, since the ground terminal and the input / output terminal are arranged on the same plane, both terminals come into contact with the solder cream. Therefore,
When the solder is reflowed, the ground terminal and the input / output terminal are simultaneously fixed to the circuit board.

When manufacturing the surface mount type dielectric filter, first, an input / output terminal is attached to an input / output section of the dielectric filter main body. Next, the dielectric filter main body to which the input / output terminals are attached is fixed on a metal plate, and the dielectric filter main body is covered with a metal case.

[0004]

In the conventional method for manufacturing the surface mount type dielectric filter, the mounting height of the input / output terminal is finely adjusted so that the input / output terminal and the ground terminal are flush with each other. However, since the assembled parts are gathered together, the mounting height of each member tends to vary, and the occurrence rate of defective products is high. Therefore, in the above-mentioned conventional method, since the production yield is low, the surface mount type dielectric filter cannot be manufactured efficiently.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method of manufacturing a surface mount type dielectric filter which suppresses variations in the mounting height of an input / output terminal and a ground terminal and has a good production yield, and a terminal frame for carrying out the method. To provide.

[0006]

A method of manufacturing a surface mount type dielectric filter according to the present invention includes the following steps. ◎ A metal plate having a ground terminal, a lead portion disposed on the same plane as the ground terminal , and an input / output capacitor
A step of preparing a terminal frame including an input / output terminal having a fixed surface for connecting a sensor and a connecting portion connecting the ground terminal and the input / output terminal. ◎ A step of fixing the outer conductor of the dielectric filter to a metal plate having a ground terminal with electrical conduction. ◎ A step of fixing the fixed surface of the input / output terminal to the inner conductor exposed on the open end face of the dielectric filter through an input / output capacitor with electrical conduction. ◎ A step of cutting the connection part from the terminal frame and separating the ground terminal and the input / output terminal from the terminal frame.

A terminal frame for a surface mount type dielectric filter according to the present invention is for manufacturing a surface mount type dielectric filter. The terminal frame includes a metal plate having a ground terminal, an input / output terminal, and a connecting portion for connecting the ground terminal and the input / output terminal. In this terminal frame, the input / output terminals are erected so as to be parallel to the lead portion and the open end face of the dielectric filter which are arranged on the same plane as the ground terminal , and the input / output capacitors are connected to the ground.
It has a fixed surface for connection .

[0008]

According to the method of manufacturing a surface mount type dielectric filter according to the present invention, when the connecting portion is separated from the terminal frame after fixing each part of the terminal frame and the dielectric filter,
A surface mount type dielectric filter having a ground terminal and an input / output terminal is obtained. In the obtained surface mount type dielectric filter, since the ground terminal and the lead portion of the input / output terminal provided integrally with the terminal frame are arranged on the same plane, the ground terminal and the lead portion of the input / output terminal are not provided. Are arranged on the same plane. Therefore, in the manufacturing method of the present invention, it is not necessary to delicately adjust the mounting position of the input / output terminal and adjust the positional relationship between the input / output terminal and the ground terminal as in the conventional example. Can be efficiently and easily manufactured.

Further, since the terminal frame for the surface mount type dielectric filter of the present invention has a lead portion in which the input / output terminal is arranged on the same plane as the ground terminal, the ground terminal and the input / output terminal are the same. A surface-mounted dielectric filter arranged on a plane can be manufactured efficiently.

[0010]

1 to 3 show a surface mount type dielectric filter 1 which can be manufactured by one embodiment of the manufacturing method of the present invention. In the figure, the surface mount type dielectric filter 1 mainly includes a filter main body 2 and a case 3 for housing the filter main body 2.

The filter body 2 is formed by joining three independent resonators 4, 5, and 6 adjacently in this order. The resonator 4 will be described with reference to FIG. Resonator 4
Has a rectangular parallelepiped dielectric block 7. At the center of the dielectric block 7, a cylindrical through hole 8 extending in the longitudinal direction is formed. A cavity 9 is provided at one end (the left end in FIG. 3) of the through hole 8. The cavity 9 has a substantially square planar shape (FIG. 2), and the end face side of the dielectric block 7 is open. A series of inner conductors 10 are attached to the inner peripheral surface of the through hole 8 and the surface of the cavity 9. An outer conductor 11 is attached to the outer peripheral surface of the dielectric block 7 except for the end surface on the cavity 9 side. The outer conductor 11 is short-circuited with the inner conductor 10 at the other end surface of the dielectric block 7. Further, the resonator 4 has a square groove 12 extending in a direction orthogonal to the through hole 8 on a side surface adjacent to the resonator 5 (FIG. 2).

The resonator 6 has the same configuration as the resonator 4, and has a rectangular groove 13 on the surface adjacent to the resonator 5. Also, the resonator 5 has angular grooves 14, 14 on the surfaces adjacent to the resonators 4, 6 on both sides, respectively.
It has the same configuration as the resonators 4 and 6.

A coupling hole 15 is formed between the adjacent resonators 4 and 5 so that the groove 12 on the resonator 4 side and the groove 14 on the resonator 5 side are opposed to each other and are orthogonal to the through hole 8. A coupling hole 16 is formed between the adjacent resonators 5 and 6 so that the groove 14 on the resonator 5 side and the groove 13 on the resonator 6 side face each other and are orthogonal to the through-hole 8. ). In the filter body 2, a filter in which three resonators 4, 5, and 6 are connected by electromagnetic field coupling generated in the coupling holes 15 and 16 is configured. The pass bandwidth of this filter can be adjusted by the electromagnetic field coupling between the coupling holes 15 and 16. For example, when the electromagnetic field coupling between the coupling holes 15 and 16 is large, the pass bandwidth is widened, and when the electromagnetic field coupling between the coupling holes 15 and 16 is small, the pass bandwidth is narrow.

As shown in FIG. 3, the filter body 2 contains input / output capacitors 17, 18 in the cavities 9 of the resonators 4, 6 at both ends. Each of the capacitors 17 and 18 includes a disk-shaped dielectric 19 and electrodes 20 and 20 disposed on both surfaces of the dielectric 19. Capacitors 17 and 18 have electrodes 20 formed through holes 8.
The capacitors 17 and 18 are connected to the inner conductor 10. Input / output terminals 22 and 23 are attached to both capacitors 17 and 18, respectively. Each of the input / output terminals 22 and 23 includes a lead 24 extending horizontally and a mounting portion 25 formed at one end of the lead 24. Mounting part 25
Is formed by bending one end of the lead portion 24, and has a vertical fixing surface 25a. The fixed surfaces 25a of the input / output terminals 22 and 23 are fixed to the electrodes 20 of the capacitors 17 and 18, respectively.

The case 3 is mainly composed of a lower case 26 and an upper case 27, as shown in FIG. The lower case 26 is a flat metal member, and
Has a substantially rectangular metal plate 28 for placing the. At both corners of the metal plate 28, fixing ground terminals 29 having U-shaped notches 29a are integrally provided. Also, both fixing ground terminals 29,
An earth terminal 30 extending from the metal plate 28 is provided between the terminals 29. A U-shaped notch 30a is provided at the tip of the ground terminal 30.

On the lower case 26, the filter body 2
Has been fixed. The filter main body 2 is fixed to the upper surface of the base 28 such that the end surface on the cavity 9 side is arranged on the ground terminal 30 side.

The upper case 27 is a box-shaped metal member, and the lower side of FIG. 2 is open. This upper case 27
The filter body 2 fixed on the lower case 26 is covered, and the periphery of the opening is fixed to the lower case 26. The ground terminals 29, 29 for fixing and the ground terminal 30 of the lower case 26 protrude from the side surface of the upper case 27. Also, the input / output terminals 22 attached to the filter body 2,
The 23 lead portions 24 project horizontally from the gap between the upper case 27 and the lower case 26 to the outside of the case 3 and are arranged on the same plane as the lower case 26 (FIGS. 1 and 3).

In the surface mount type dielectric filter 1, since the lead portions 24 of the input / output terminals 22 and 23 extending from the filter body 2 are on the same plane as the lower case 26 having the ground terminals 29 and 30, the mounting surface ( 1 and 3)
Is flat. For this reason, the surface mount type dielectric filter 1 is easily fixed on the circuit board when the mounting surface side is placed on the circuit board on which the solder cream is arranged at a predetermined position and the solder is reflowed.

Next, a method of manufacturing the surface mount type dielectric filter 1 according to one embodiment of the present invention will be described.
First, as shown in FIG. 4, an end as one embodiment of the present invention is shown.
A child frame 40 is prepared. This terminal frame 40
The input / output terminals 22 and 23 and the lower case 26 having the ground terminals 29 and 30 are integrally provided. The input / output terminals 22 and 23 are arranged in parallel, and a lead 24 extending vertically from the lead frame 41 and a lead 2
4 and a mounting portion 25 provided at the tip of the device.
The attachment portion 25 is formed by bending one end of the lead portion 24, and has a vertical fixing surface 25a. The lower case 26 is arranged on the same plane as the lead portions 24 of the input / output terminals 22 and 23. The lower case 26 is arranged on the side of the mounting portion 25 of the input / output terminals 22 and 23 and has a substantially rectangular metal plate 28. Metal plate 28
Extend to the lead frame 41 side and have the input / output terminals 22,
23 has a ground terminal 30b disposed between them. The lower case 26 is integrated with the lead frame 41 by supporting portions 42a and 42b extending from both sides of the metal plate 28 and the ground terminal 30b. In addition, both support portions 42
a, 42b and the ground terminal 30b
have.

The terminal frame 40 is obtained, for example, by stamping a plate-shaped member into a predetermined shape and forming the mounting portion 25 of the input / output terminals 22 and 23 by bending.

Next, the above-described filter main body 2 is prepared, and capacitors 17 and 18 are soldered into the respective cavities 9 of the resonators 4 and 6 at both ends constituting the filter main body 2. Then, the filter body 2 is connected to the terminal frame 40.
Placed on the lower case 26 and fixed. Here, the filter main body 2 is fixed on the metal plate 28 of the lower case 26 so that the fixing surfaces 25a of the input / output terminals 22 and 23 abut against the capacitors 17 and 18 attached to the filter main body 2.
Subsequently, the fixed surfaces 25a of the input / output terminals 22 and 23 are fixed to the electrodes 20 of the capacitors 17 and 18, respectively. It should be noted that the lower case 26 is fixed to the filter body 2 and the fixing surfaces 25a of the input / output terminals 22 and 23 and the capacitors 17 and
Solder or a conductive adhesive is used for fixing.

Next, the upper case 27 is disposed on the filter main body 2 fixed to the lower case 26, and the periphery of the opening of the upper case 27 is fixed to the lower case 26. Thus, the filter body 2 is accommodated in the case 3 including the lower case 26 and the upper case 27. Although the fixing of the lower case 26 and the fixing of the upper case 27 are shown in a stepwise manner, the fixing may be performed simultaneously.

Next, the lead portions 2 of the input / output terminals 22 and 23
4 from the lead frame 41 and the lower case 26
Support portions 42a and 42b for supporting the ground terminal 30
b is cut near the center of the long hole 43 in the long diameter direction. Thereby, the lower case 26 is separated from the electrode frame 40, and the surface mount type dielectric filter 1 is obtained. In the obtained surface mount type dielectric filter 1, the cut support portion 4
2a, 42b and the ground terminal 30b make the lower case 26
The fixing ground terminal 29 and the ground terminal 30 are formed. The fixing ground terminal 29 and the ground terminal 30
U-shaped cutouts 29a derived from the long holes 43,
30a.

In the surface mount type dielectric filter 1 obtained by the above-described manufacturing method, since the terminal frame 40 is formed flat except for the mounting portions 25 of the input / output terminals 22 and 23, the lower case 26 and the ground are provided. The entire terminals 29 and 30 and the lead portions 24 of the input / output terminals 22 and 23 are arranged on the same plane. Therefore, according to the above-described manufacturing method, a surface-mounted dielectric filter having a flat mounting surface can be efficiently and easily obtained without finely adjusting the mounting positions of the input / output terminals as in the conventional example.

[Other Embodiment] Instead of the terminal frame 40, a terminal frame 50 shown in FIG.
The terminal frame 50 has the same configuration as the terminal frame 40 except that projecting pieces 51 for holding the filter body 2 are provided on both side edges of the lower case 26. The both protruding pieces 51, 51 are curved inward and have inward elasticity.

When the terminal frame 50 is used, the filter main body 2 mounted on the lower case 26 is
Since the filter body 2 is stably held therebetween, there is no need to support the filter main body 2 on the lower case 26 using a special jig, and a surface-mounted dielectric filter can be manufactured more efficiently.

[0027]

According to the method of manufacturing a surface mount type dielectric filter according to the present invention, since the above-mentioned terminal frame is used, there is no variation in the mounting height of the input / output terminal and the ground terminal, and the surface can be easily manufactured. A mounting type dielectric filter can be realized. In the terminal frame for a surface mount type dielectric filter according to the present invention, since the input / output electrodes have the leads arranged on the same plane as the ground electrode, the surface mount type dielectric filter can be manufactured efficiently.

[Brief description of the drawings]

FIG. 1 is a perspective view of a surface mount type dielectric filter manufactured according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the surface mount type dielectric filter.

FIG. 3 is a sectional view taken along the line III-III in FIG. 1;

FIG. 4 is a perspective partial view of an electrode frame according to one embodiment of the present invention.

FIG. 5 is a diagram corresponding to FIG. 4 of another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Surface mount type dielectric filter 2 Filter body 22 and 23 I / O terminal 24 Lead part 26 Lower case 30 Ground terminal 40 Terminal frame 41 Lead frame

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H01P 11/00 H01P 1/205

Claims (2)

(57) [Claims] A metal plate having a ground terminal, a lead portion disposed on the same plane as the ground terminal and an open end face of a dielectric filter, which are erected in parallel with each other ;
A step of preparing a terminal frame having an input / output terminal having a fixed surface for connecting an input / output capacitor, and a connecting portion for connecting the ground terminal and the input / output terminal; and Fixing the outer conductor of the dielectric filter to the metal plate with electrical conduction; and electrically connecting the fixed surface of the input / output terminal to the inner conductor exposed on the open end face of the dielectric filter via an input / output capacitor. And cutting the connecting portion from the terminal frame and separating the ground terminal and the input / output terminal from the terminal frame. 2. A terminal frame for manufacturing a surface-mounted dielectric filter, comprising a ground terminal, an input / output terminal, and a connecting portion for connecting the ground terminal and the input / output terminal. In the above, the input / output terminal is erected so as to be parallel to a lead portion and an open end face of the dielectric filter arranged on the same plane as the ground terminal , and an input / output capacitor is connected.
A terminal frame for a surface mount type dielectric filter, characterized by having a fixing surface for mounting.