JPH09232163A - Chip-type inductance element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inductance element capable of obtaining a high Q-value in high-frequency and ultra high-frequency bands of 200MHz-2GHz too, and to be used in a process of manufacturing noise filters having their excellent cut-off characteristics. SOLUTION: This inductance element is composed of horizontal segments 101-119 of L1 length and vertical segments 131-147 of L2 length planelike and bound with one another long so as to be in a zigzag shape. Here, the both-side tips of each of the above-mentioned horizontal segments excluding the foremost horizontal segment 101 and the rearmost horizontal segment 119 are bound with the vertical segments 131-147 respectively. And all the horizontal segments 101-119 are arranged in parallel at equal intervals, and a leg part is extended from at least one of the foremost and rearmost above-mentioned horizontal segments 101, 119, and induction coupling is prevented from being generated between segments respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chip-type inductance element suitable for use as a noise filter for suppressing the emission of interfering electromagnetic waves from electronic equipment and the structure of a lead frame used as this element.

[0002]

2. Description of the Related Art Recently, due to the popularization of computers, especially personal computers, a large amount of high-frequency electromagnetic wave signals are generated to interfere with the operation of other electronic devices (hereinafter referred to as "interfering electromagnetic waves"). Called)). Therefore, since such an interference electromagnetic wave reduces the output level of a signal, countries have stipulated regulations for reducing the source of such a signal. A method or apparatus for reducing the signal output of such an electromagnetic wave is known in various documents, and one of them is a method using a noise filter.

The noise filter may be provided on the circuit board independently of other electronic components, or may be arranged on the circuit board. It is desirable that such a noise filter is manufactured in a chip type in order to facilitate the work of mounting or disposing on a circuit board or the like. A ferrite core or a coil is used as the inductance element in this chip type noise filter.

However, the noise filter having such an inductance element has poor temperature characteristics,
In addition, there is a drawback that the function as an inductance cannot be sufficiently exhibited at a high frequency of 200 MHz-2 GHz and an ultra-high frequency, and a cutoff characteristic as a noise filter cannot be sufficiently obtained. Further, since a device used at high frequency or ultra high frequency such as input / output video signal line, clock frequency line, RF signal line and mobile phone is required to be cut off at a specific frequency, a noise filter having excellent cutoff characteristics is required. ing.

[0005]

Therefore, the present invention is
It is an object of the present invention to provide an inductance element that can obtain a high Q value even in a high frequency band of 200 MHz to 2 GHz and an ultra high frequency band and has excellent cut-off characteristics and that is used for a noise filter or the like.

[0006]

SUMMARY OF THE INVENTION An inductance element of the present invention comprises a horizontal segment having a length L1 and a vertical segment having a length L2 so that they are flatly connected to each other to form a zigzag shape. Each of the horizontal segments except for the frontmost horizontal segment and the rearmost horizontal segment is connected at both ends by the vertical segments, and all the horizontal segments are evenly spaced. The legs are parallel and extend from at least one of the front and back of the horizontal segments. In particular, the chip capacitor attachment portion is formed in the leg portion, and the chip capacitor is attached to this portion so that the L-shaped inductance filter can be efficiently manufactured.

Further, as another form of the inductance element according to the present invention, a T-shaped filter can be efficiently constructed, and the inductance elements for this purpose are planar and are longly connected to each other to form a zigzag form. And the length is L
1 horizontal segment and also a vertical segment having a length L2, each of the horizontal segments except the frontmost horizontal segment and the rearmost horizontal segment has a tip on both sides as described above. All said horizontal segments are equidistant and parallel, connected by vertical segments, and a first inductance with legs extending from at least one of said front and rear horizontal segments. An element, a second inductance element having the same form as the first inductance element, a connecting segment connecting them, and a third extending from the connecting segment in the direction of the leg parallel to the leg. It is composed of a leg part, and a chip capacitor attachment part is formed on this third leg part, and the chip capacitor can be attached to this part. It is.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic view of a lead type inductance device for manufacturing a noise filter of the present invention.
Shows a frame. FIG. 2 is an enlarged view in which a part of FIG. 1 is enlarged. FIG. 3A is a diagram showing one inductance element in the lead frame of FIG. FIG. 3B shows a portion to which the chip capacitor is attached.

First, referring to FIG. 3 (A), a plurality of horizontal segments (101, 101) having a plurality of lengths L1 are arranged so that the inductance elements are flat and long and connected to each other in a zigzag form.
103,105, 107, 109, 111, 113, 115, 117, 119) and vertical segments with multiple lengths L2 (131, 133, 135,
137, 139, 141, 143, 145, 147). Each of the horizontal segments except the frontmost horizontal segment (101) and the rearmost horizontal segment (119) is joined at the ends on both sides by the vertical segments described above, and all the horizontal segments are equally spaced. The legs are parallel (15) from the rearmost horizontal segment (119)
Is extended, and the leg portion (15) is provided with an attachment portion (151) of the chip capacitor as shown by a dotted line portion in FIG. 3 (B). In the inductance element having such a form, when the chip capacitor is attached to the chip capacitor attachment portion (151) of the leg portion (15), an L-shaped filter is manufactured as shown in FIG.

Therefore, such a form has a higher Q value because the inductive coupling does not occur between the respective segments as the frequency becomes higher, so that the filter can be manufactured rather than using a coil. For, the workability will be excellent.

Another embodiment according to the present invention will be described below. FIG. 5 is a view showing an inductance element for manufacturing a chip type T-shaped noise filter according to the present invention and a different shape. FIG. 6 shows a circuit diagram when the chip capacitor is attached to the chip capacitor attachment portion in FIG.

Referring to FIG. 5, the inductance elements (21a) are planar and are connected to each other in a zigzag shape to form a zigzag shape. The horizontal segments (201a, 2a) are L1 in length.
03a, 205a, 207a, 209a, 211a, 213a, 215a, 217a, 219
a, 221a) and a vertical segment (231a, 2
33a, 235a, 237a, 239a, 214a, 243a, 245a, 247a, 249
a) and each of the horizontal segments except for the frontmost horizontal segment (201a) and the rearmost horizontal segment (219a), each of which has a vertical segment (231a, 2a)
33a, 235a, 237a, 239a, 214a, 243a, 245a, 247a, 249
Connected by a), all said horizontal segments are evenly spaced and arranged in parallel. On the other hand, the leg (25a) extends from the frontmost horizontal segment (201a) of the first inductance element (21a).

The second inductance element (21b) and the first inductance element (21b) are connected to each other in a plane to be long, and the plurality of horizontal segments (201b, 203b, 203b, 203b, 205b, 207b, 209b, 211b,
213b, 215b, 217b, 219b, 221b) and multiple lengths are L2.
Vertical segments (231b, 233b, 235b, 237b, 239b,
214b, 243b, 245b, 247b, 249b) and each of the horizontal segments except the frontmost horizontal segment (201b) and the rearmost horizontal segment (219b) has vertical ends (231b , 233b, 235b, 237b, 239b,
214b, 243b, 245b, 247b, 249b) and all said horizontal segments are equally spaced and parallel.

On the other hand, the second leg portion (25b) is also the front horizontal segment element (201) of the second inductance element (21b).
It has been extended from b). The first inductance element (21a) and the second inductance element (21b) are connected by the connecting segment (29), and the third leg portion (27) having the chip capacitor adhering portion (271) is connected by the connecting segment (29).
It is extended from (29). The inductance element having such a configuration is used for the chip capacitor attachment part (27
When a chip capacitor is attached to 1), a T-shaped filter as shown in Fig. 6 is manufactured.

The inductance element used for manufacturing the chip type noise filter is made of brass and has a thickness (R) of
0.1mm ≦ R ≦ 0.3mm, vertical segment length L2 is 0.2 ≦ L2
≤0.63 mm, and the length L1 of the horizontal segment is 1 mm ≤L1 ≤2.2 mm, which is to reduce the stray capacitance and increase the insulation resistance of the resin mold. Such an inductance element is manufactured as a lead frame by etching brass, alloy (42 alloy) or phosphorus (P) bronze.

When manufacturing an L-type or T-type filter, a chip capacitor is attached to the attachment portions (151, 272) and the inductance element portion is resin-molded. Then, the lead portion is cut from the lead frame and a lead process is performed to complete a chip-type filter element.

[0017]

According to the present invention, since the inductance element is formed by using the lead frame as described above, the chip type inductance element or the filter element can be easily manufactured by using the existing manufacturing process. In addition, since the inductance element formed by using the lead frame can be finely processed and has almost no temperature characteristics, it has characteristics suitable for suppressing electromagnetic interference in high-frequency or ultra-high-frequency regions of mobile phones and the like. A filter element having the same can be obtained.

[Brief description of drawings]

FIG. 1 is a chip-type L-shaped noise filter according to the present invention.
The figure which shows the lead frame which consists of an inductance element for manufacture.

FIG. 2 is an enlarged view of FIG. 1;

FIG. 3 is a diagram showing one inductance element in the lead frame shown in FIG.

FIG. 4 is a circuit diagram when a chip capacitor is attached to the chip capacitor attaching portion shown in FIG.

FIG. 5 is a view showing another form of an inductance element for manufacturing a chip type T-type noise filter according to the present invention.

6 is a circuit diagram when a chip capacitor is attached to the attachment part of the chip capacitor shown in FIG.

[Explanation of symbols]

15 leg 21 a first inductance element 21 b second inductance element 25 a first leg 25 b second inductance element 29 connecting segment 101, 103, 105, 107, 109, 111, 113, 115, 117, 119
Horizontal segment 131, 133, 135, 137, 139, 141, 143, 145, 147
Vertical segment 151 Chip capacitor attachment part 271 Chip capacitor attachment part

Claims (4)

[Claims] 1. A plurality of horizontal segments having a length of L1 and a plurality of vertical segments having a length of L2 are connected to each other to form a zigzag shape in a planar shape. Each of the horizontal segments except for the front horizontal segment and the rearmost horizontal segment has both ends joined by the vertical segments, and all the horizontal segments are arranged at equal intervals in parallel, A chip-type inductance element having a leg extending from at least one of the front and rear horizontal segments. 2. The chip-type inductance element according to claim 1, wherein a chip capacitor adhering part is formed on the leg part. 3. A horizontal segment having a plurality of lengths L1 and a vertical segment having a plurality of lengths L2 are connected to each other to form a zigzag shape in a planar shape. Each of the horizontal segments except for the front horizontal segment and the rearmost horizontal segment has both ends joined by the vertical segments, and all the horizontal segments are arranged at equal intervals in parallel, A first leg extending from at least one of the front and rear horizontal segments;
An inductance element; a second inductance element having the same form as the first inductance element;
A chip-type inductance element comprising a connecting segment connecting the inductance element and the second inductance element, and a third leg extending from the connecting segment in parallel with the leg. 4. The chip type inductance device according to claim 3, wherein a chip capacitor adhering part is formed on the third leg part.