JPH06164212A - Terminal structure for electronic component - Google Patents

Abstract

PURPOSE:To reduce the ground impedance and to secure the desired electrical characteristic by providing a prescribed terminal on each of side walls counter to each other of a case and using the terminals set at both end parts of one of both side walls and a terminal of the center part of the other side wall as the ground terminals. CONSTITUTION:The ferrite is put into a hole formed at the center part of a ground substrate provided on the bottom surface of a lower case 2a. The inner edge part of each terminal 14 is connected to each port electrode formed on the surface of a center electrode substrate. Meanwhile the outer edge part of each terminal 14 is exposed outside through an opening 16 formed between the right and left side faces of a lower case 2a counter to each other. Then the terminals 17a and 17b positioning at both end parts of a right side wall 12a are used as the ground terminals among those 6 terminals 14. A terminal 18a set at the center part of the wall 12a is used as an input/output terminal, and a terminal 17c set at the center part of a left side wall 12b serves as a ground terminal. Then the terminals 18b and 18c positioning at both end parts serve as the input/output terminals.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal structure for an electronic component improved so that desired grounding characteristics can be obtained by reducing earth impedance inside the component.
Since the present invention is suitable for non-reciprocal circuit devices such as circulators and isolators used in the VHF, UHF, and SHF bands, the case of application to this will be described below as an example.

[0002]

2. Description of the Related Art Generally, circulators and isolators have a function of passing signals only in the transmission direction and blocking transmission in the opposite direction, and are indispensable parts for mobile communication devices such as mobile phones and car phones. Is. Such a circulator is mainly configured to arrange ferrite in a magnetic metal case, to arrange a plurality of center conductors in the ferrite, and to apply a DC magnetic field to the ferrite by a permanent magnet. . Further, one end of each of the center conductors is connected to the input / output terminal via the matching capacitor, and the other end is connected to the ground terminal.

A conventional terminal structure of the circulator is shown in FIG. FIG. 13 (a) is a plan view,
13B is a front view, FIG. 13C is a bottom view, and FIG.
(D) is a side view. In the figure, 40 is a circulator, which is the left and right side walls 41a, 4 of the metal case 41.
1b is formed with openings at both ends thereof, the input / output terminals 42a, 42b are arranged in the openings on one end side, the ground terminals 43a, 43b are arranged in the openings on the other end side, and the remaining one side wall 41c is formed. The input / output terminals 44 are arranged in the central opening of the, and the five terminals are arranged in this manner. In such a terminal structure, each of the above ground terminals 4
By making the plate widths of 3a and 43b larger than the plate widths of the input / output terminals 42a and 42b, the ground impedance inside the component is reduced and the same potential with the external ground is maintained.

[0004]

However, in the above-mentioned conventional terminal structure, since the input / output terminal 44 is located at a portion far from the ground terminals 43a and 43b in the central portion of the one side wall 41c, the ground is sufficiently grounded. I can not take it,
As a result, the ground impedance becomes large, and the desired electrical characteristics cannot be obtained. Such a tendency is likely to appear in the microwave band, particularly in the quasi-microwave band above 1 GHz.

An object of the present invention is to provide a terminal structure for an electronic component, which can surely establish a ground in any part inside the electronic component, and which can reduce a ground impedance to obtain desired electric characteristics. To do.

[0006]

SUMMARY OF THE INVENTION Therefore, the present invention provides an electronic component having an input / output terminal and a ground terminal for leading out the component element to the outside in an opening of a case accommodating the electronic component element. In the terminal structure, three terminals are respectively disposed on one side wall and the other side wall of the case facing each other, and at least the first and second terminals located at both ends of the one side wall and the central portion of the other side wall. The third terminal located is a ground terminal.

Here, in the case of an electronic component having three input / output terminals, the fourth terminal at the central portion of the one side wall and the fifth and sixth terminals at both ends of the other side wall become the input / output terminals. . Further, when the number of input / output terminals is two, one of the fourth to sixth terminals is a non-connection terminal or is used as a ground terminal.

[0008]

According to the terminal structure of the electronic component of the present invention, three terminals are provided on each of the opposing side walls of the case,
Since the first and second terminals at both ends of the one side wall and the third terminal at the center of the other side wall are ground terminals, the remaining three fourth to sixth terminals, or two of them are used. By using the book as an input / output terminal, both of these input / output terminals are located near the ground terminal. as a result,
It is possible to sufficiently ground the earth in any part of the electronic component, and the ground impedance can be reduced accordingly, and desired electrical characteristics can be obtained.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 7 are views for explaining a terminal structure of an electronic component according to an embodiment of the present invention. In this embodiment,
A case where the invention is applied to a surface-mounted circulator will be described as an example. In FIG. 2, reference numeral 1 denotes a circulator of this embodiment, which is a lower case 2 made of magnetic metal.
A disk-shaped ferrite 3 is disposed on a, a center electrode substrate 4 is disposed on the ferrite 3, and an upper case 2b made of a magnetic metal is mounted on the lower case 2a to form a magnetic closed circuit. The upper case 2b is configured and
The permanent magnet 5 is attached to the inner wall surface of the above, and a DC magnetic field is applied to the ferrite 3 by the permanent magnet 5.

An earth substrate 6 is arranged on the bottom surface of the lower case 2a, and the ferrite 3 is inserted and arranged in a hole 6a formed in the central portion of the earth substrate 6. Insert holes 6b are formed in the peripheral portion of the holes 6a of the ground substrate 6 at an angle of 120 degrees.
Single-plate-shaped chip capacitors C1 to C3 are inserted and arranged in b.

Further, the respective insertion holes 6b on the upper surface of the earth substrate 6
Ground electrodes 7a to 7c are formed between them, and each ground electrode 7a to 7c extends to the outer edge of the substrate 6. Further, a ground electrode (not shown) is formed on the entire lower surface of the ground substrate 6, and the ground electrode and the ground electrodes 7a to 7c on the upper surface are connected through a through hole 8.

The center electrode substrate 4 has an upper surface,
The first and second central conductors 9a and 9b are formed on the lower surface and the lower surface, respectively, and the third central conductor 9 is formed inside the electrode substrate 4.
c is a laminated type. The central conductors 9a to 9c are arranged in an electrically insulated state and are arranged in an intersecting manner at an angle of 120 degrees with each other, and the ferrite 3 is in contact with the intersecting portion.

Both ends of each of the central conductors 9a to 9c are led out to the upper surface and the lower surface of the electrode substrate 4 through the through holes 10, and the port electrodes 1 are provided at the lead-out portions on both surfaces.
1a-11f are formed. Each port electrode 11
a to 11f respectively extend to the outer edge of the electrode substrate 4,
Port electrodes 11a to 11f facing each other with the substrate 4 sandwiched therebetween.
The two are connected to each other through a through hole 10. The input / output port electrodes 11a, 11c, 11e on the lower surface side are connected to the chip capacitors C1 to C3, and the remaining ground port electrodes 11b, 11d, 11f are connected to the ground electrodes 7a to 7c. There is.

A terminal block 1 is provided on the center electrode substrate 4.
In this terminal block 12, three terminals 14 made of a metal plate are arranged on the left and right leg portions 13b of the resin member 13 at intervals and in the same direction. It is configured. An insertion hole 13a into which the permanent magnet 5 is inserted is formed in the center of the main body of the resin member 13.

The terminal block 12 is shown in FIGS.
It is manufactured by the method shown in. In this, each terminal portion 15a is integrally formed between a pair of frames 15, and the inner end portion of each terminal portion 15a is bent and formed in a step shape. Next, the respective terminal portions 15a are inserted into the resin to form the resin member 13, and thereafter, the respective terminal portions 15a of the frame 15 are cut along the alternate long and short dash line in FIG. 5 to form the terminals 14. In each terminal 14 thus formed, the inner end 14a of the terminal 14 is exposed on the inner lower surface of the leg 13b of the resin member 13, the outer end 14b projects outward from the bottom surface of the leg 13b, and the central portion Is embedded in the leg portion 13b. Next, as shown in FIGS. 4A and 4B, the outer end portions 14b of the terminals 14 are bent upward and brought into contact with the outer surfaces of the leg portions 13b. As a result, each of the bent terminals 14 is connected to the ground terminal 17a as described later.
.About.17c and the input / output terminals 18a to 18c are manufactured.

The inner end portion 14a of each terminal 14 is connected to each of the port electrodes 11a to 11f on the upper surface of the center electrode substrate 4.
It is connected to the. The outer ends 14b of the terminals 14 are exposed to the outside through openings 16 formed in the left and right side surfaces of the lower case 2a that face each other.

As a result, FIG. 1 (a) to FIG. 1 (d)
As shown in FIG.
The terminals 17a and 17b located at both ends of a are ground terminals, and the terminal 18a in the center is an input / output terminal. The terminal 17c at the center of the left side wall 12b serves as a ground terminal, and the terminals 18b, 18c at both ends serve as input / output terminals.

Further, in this embodiment, as shown in FIG. 1 (a), the upper surface of the upper case 2b is colored with a black color 20 so that the upper case 2b has a black color 2.
It is divided into 0 part and a white-colored 21 part of the case color.

Next, the function and effect of this embodiment will be described. According to the circulator 1 of the present embodiment, the left and right side openings 16 of the lower case 2a are respectively provided with three terminals 6, six terminals 14 in total, and the terminals 17a at both ends of the right side wall 13a,
17b and the terminal 17c at the center of the left side wall 12b are used as ground terminals, and the remaining terminals 18a to 18c are used as input / output terminals. Therefore, each component element constituting the isolator 1 and each input / output terminal 18a to 18c and each ground. Terminals 17a-17
The ground path with c can be made uniform and short.
As a result, a good ground with a small ground impedance can be obtained, and desired electrical characteristics can be obtained. Further, since the ground terminals 17a to 17c are arranged next to the input / output terminals 18a to 18c, electrical symmetry can be obtained, and characteristic variations among the ports can be avoided.

Further, in the present embodiment, since the number of terminals is 6, the heat generated by the components can be easily released to the printed circuit board, the heat dissipation can be improved, and the soldering strength when mounting on the printed circuit board can be improved. It is possible to improve the reliability of connection. Further, in this embodiment, the input / output terminals 18a-18c are guarded by the ground terminals 17a-17c, and the input / output port electrodes 11a, 11c, 11e of the center electrode substrate 4 are also grounded. Since the structure is guarded by the port electrodes 11b, 11d, 11f, isolation can be improved.

Further, according to this embodiment, the terminal block 1
2 is configured by insert-molding each terminal 14 into the resin member 13 as described above and projecting the outer end portion 14b of the terminal 14 outward from the bottom surface of the leg portion 13b. It is possible to configure a plurality of terminals having different values. That is, the outer end portion 14b of each terminal 14 is projected as it is (see FIG. 4B), and the outer end portion 14b is bent upward to expose the side surface (see FIG. 4).
(See (a)), or those not shown in the drawing, but with the outer end portion 14b bent stepwise or cut, etc.
Various shapes can be supported simply by adding processing. As a result, it is only necessary to prepare one mold for insert molding, and the manufacturing cost can be reduced. In other words, in the past,
As shown in FIGS. 9 and 10, when manufacturing the side exposed type terminal block 25 or the protruding type terminal block 26, they are formed by using separate molds, respectively, and the cost increases accordingly. There was a problem.

Further, in this embodiment, the upper case 2b is color-coded into the black color 20 and the white color 21, so that when the circulator 1 is housed in the component supply tape 22, as shown in FIG. The direction of 1 can be easily identified, and erroneous insertion at the time of mounting can be prevented. For example, as shown in FIG. 7, when the storage orientation of the component 1 ′ is different, it can be easily visually determined, and by shining light on the component 1 ′, the orientation of the component can be determined from the reflected light. A simple automatic device such as a model photo / interrupter can be used to reduce the mounting cost. That is, in the case of the conventional case, FIGS.
As shown in FIG. 2, the parts number 27a,
The one displaying the signal input / output direction 27b is adopted. Therefore, when the orientations of the parts 27 are different, there is a problem that it is difficult to make a visual judgment, and the equipment cost is high to read by the image recognition device.

Although the circulator 1 having three input / output terminals 18 has been described in the above embodiment, the present invention can be applied to an isolator having two input / output terminals. FIG. 8 is a diagram showing a case where it is applied to the isolator, in which the same reference numerals as those in FIG. 2 indicate the same or corresponding portions. This isolator 30 employs a protruding type terminal block 12 and also has a center electrode substrate 4
A pair of terminating chip resistors 32 are arranged on one of the input / output port electrodes 11e, one electrode of each chip resistor 32 is connected to the port electrode 11e, and the other electrode is connected to each of the earth port electrodes 11d and 11f. , And thus the port electrode 11e is not connected to an external circuit.

In the isolator 30, the center terminal 14 on the left side is a ground terminal 17, and the terminals 14 at both ends are input / output terminals 18. The center terminal 14 on the right side is connected to the connecting portion 11g of the earth port electrodes 11d and 11f to serve as a ground terminal (not shown), whereby all the right terminals 14 are grounded. It is a terminal. Here, the central terminal on the right side surface may be unconnected, and in this case, the connection electrode 11g is unnecessary.

Also in the isolator 30 described above, the earth impedance can be reduced, the expected electrical characteristics can be obtained, and the same effect as that of the above-mentioned embodiment can be obtained.

In the above embodiment, the circulator,
Although an isolator has been described as an example, the present invention is not limited to this, and can be applied to a terminal structure of another electronic component.

[0027]

As described above, according to the terminal structure for an electronic component of the present invention, three terminals are provided on each of the side walls of the case which face each other, and the terminals at both ends of one side wall and the other side. Since the terminal at the center of the side wall of the device is the grounding terminal, it is possible to sufficiently ground the earth in any part of the electronic component, and there is an effect that the grounding impedance is reduced to that extent and desired electrical characteristics are obtained.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a terminal structure of an electronic component according to an exemplary embodiment of the present invention.

FIG. 2 is an exploded perspective view of a circulator to which the terminal structure of the above embodiment is applied.

FIG. 3 is a perspective view showing a terminal block of the above embodiment.

FIG. 4 is a diagram showing a terminal block of the above embodiment.

FIG. 5 is a perspective view showing a method of manufacturing the terminal block of the above embodiment.

FIG. 6 is a plan view showing a housed state of the circulator of the embodiment.

FIG. 7 is a plan view showing a storage orientation of the circulator of the above embodiment.

FIG. 8 is an exploded perspective view showing an isolator according to another example of the above embodiment.

FIG. 9 is a perspective view showing a conventional terminal block.

FIG. 10 is a perspective view showing a conventional terminal block.

FIG. 11 is a perspective view showing a stored state of a conventional circulator.

FIG. 12 is a perspective view showing a storage direction of a conventional circulator.

FIG. 13 is a diagram showing a conventional terminal structure.

[Explanation of symbols]

1,30 Circulator, isolator (electronic component) 2a Lower case 2b Upper case 3 to 6 Electronic component element 12a, 12b One side, the other side wall 16 Opening 17a, 17b Ground terminal (terminals at both ends of one side wall) 17c Ground terminal ( Terminals in the center of the other side wall) 18a to 18c Input / output terminals

Front page continuation (72) Inventor Takashi Kawanami 2 26-10 Tenjin, Nagaokakyo, Kyoto Prefecture Murata Manufacturing Co., Ltd. (72) Inventor Takashi Hasegawa 2 26-10 Tenjin, Nagaokakyo, Kyoto Murata Manufacturing Co., Ltd. (72) Inventor Katsuyuki Taihei, 26-20 Tenjin, Tenjin, Nagaokakyo, Kyoto Prefecture Murata Manufacturing Co., Ltd.

Claims (1)

[Claims] 1. In a terminal structure of an electronic component, wherein an input / output terminal and a ground terminal for leading out the component element to the outside are arranged in an opening of a case accommodating the electronic component element, one of the cases facing each other. , Three terminals are arranged on the other side wall, and at least the first and second terminals located at both ends of the one side wall and the third terminal located at the center of the other side wall are ground terminals. A terminal structure for electronic parts characterized by the above.