JPH01264008A - Noise rejection filter - Google Patents
Noise rejection filterInfo
- Publication number
- JPH01264008A JPH01264008A JP9019688A JP9019688A JPH01264008A JP H01264008 A JPH01264008 A JP H01264008A JP 9019688 A JP9019688 A JP 9019688A JP 9019688 A JP9019688 A JP 9019688A JP H01264008 A JPH01264008 A JP H01264008A
- Authority
- JP
- Japan
- Prior art keywords
- filter
- noise rejection
- noise removal
- conductor
- noise
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000004020 conductor Substances 0.000 claims abstract description 11
- 239000011347 resin Substances 0.000 claims abstract description 10
- 229920005989 resin Polymers 0.000 claims abstract description 10
- 239000002184 metal Substances 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 230000008878 coupling Effects 0.000 abstract description 6
- 238000010168 coupling process Methods 0.000 abstract description 6
- 238000005859 coupling reaction Methods 0.000 abstract description 6
- 239000003990 capacitor Substances 0.000 abstract description 5
- 230000007257 malfunction Effects 0.000 abstract description 3
- 229910001369 Brass Inorganic materials 0.000 abstract description 2
- 239000010951 brass Substances 0.000 abstract description 2
- 230000000903 blocking effect Effects 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000007789 sealing Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 241001191378 Moho Species 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 210000000936 intestine Anatomy 0.000 description 1
Landscapes
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
- Filters And Equalizers (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、電気・電子機器などで発生する電磁妨害を低
減するためのノイズ除去フィルタに関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a noise removal filter for reducing electromagnetic interference generated in electrical and electronic equipment.
（従来の技術）
従来この種のノイズ除去フィルタについて、第３図によ
り説明する。同図において、従来のノイズ除去フィルタ
は、直列に接続した２個のインダクタンス１および２と
その中間に接続したコンデンサ３から構成されたＴ形フ
ィルタで、高調波妨害信号を減衰させるものである。さ
らに、上記のインダクタンス１および２とコンデンサ３
を樹脂４で封止している。(Prior Art) A conventional noise removal filter of this type will be explained with reference to FIG. In the figure, the conventional noise removal filter is a T-type filter composed of two inductances 1 and 2 connected in series and a capacitor 3 connected in between, and is used to attenuate harmonic interference signals. Furthermore, the above inductances 1 and 2 and capacitor 3
is sealed with resin 4.
（発明が解決しようとする課題）
しかしながら、上記の構成では、妨害波が外部からノイ
ズ除去フィルタに飛来した場合にはフィルタ自身が誤動
作を起こすという問題があった。(Problems to be Solved by the Invention) However, in the above configuration, there is a problem in that when interference waves come from the outside to the noise removal filter, the filter itself malfunctions.
また、２個のインダクタンス１および２間の結合が小さ
い方が減衰特性が良く、優れた妨害除去能力が得られる
が、これはインダクタンス１および２を離す必要があり
、部品の寸法が大きくなるため、採用することができな
いという問題もあった。Also, the smaller the coupling between the two inductances 1 and 2, the better the attenuation characteristics and the better the interference removal ability, but this requires separating the inductances 1 and 2, which increases the size of the component. , there was also the problem of not being able to hire them.
本発明は上記の課題を解決するもので、外来妨害波によ
る誤動作が発生せず、減衰特性にも優れ。The present invention solves the above problems and does not cause malfunctions due to external interference waves and has excellent attenuation characteristics.
小形化に対応できるノイズ除去フィルタを提供するもの
である。The present invention provides a noise removal filter that can be made smaller.
（課題を解決するための手段）
上記の課題を解決するため、本発明は、ノイズ除去フィ
ルタの全周面又は一部を板状導体を用いて外装するもの
である。(Means for Solving the Problems) In order to solve the above problems, the present invention covers the entire circumferential surface or a part of the noise removal filter using a plate-shaped conductor.
（作 用）
」二記の構成により、外部から妨害波がノイズ除去フィ
ルタに飛来した場合は、外装された導体を通してアース
へ流れてしまうか、うず電流となって消えるので、ノイ
ズ除去フィルタ内を流れる信号に影響を与えることはな
い。インダクタンス部より発生した磁束は外装された導
体により疎外されるため、インダクタンス相互間の結合
が小さくなり減衰特性が約１０ｄＢ改善される。(Function) With the configuration described in section 2 above, if interference waves come into the noise removal filter from the outside, they will flow to the ground through the external conductor or disappear as eddy currents, so they will not flow inside the noise removal filter. It does not affect the flowing signal. Since the magnetic flux generated from the inductance section is separated by the exterior conductor, the coupling between the inductances is reduced, and the attenuation characteristic is improved by about 10 dB.
（実施例）
本発明による実施例を第１図および第２図により説明す
る。(Example) An example according to the present invention will be described with reference to FIGS. 1 and 2.
第１図（ａ）および（ｂ）は、本発明による第１の実施
例の正面断面図および側面断面図で、第３図に示した従
来例との相異点は、黄銅板等の板状導体で形成し、下方
に伸びる接地端子５ａを有するシールドケース５の中に
、インダクタンスおよびコンデンサを樹脂４でモールド
し、固定したことである。その他は変わりがないので、
同じ構成部品には同一符号を付して説明を省略する。FIGS. 1(a) and (b) are a front sectional view and a side sectional view of a first embodiment of the present invention. The difference from the conventional example shown in FIG. An inductance and a capacitor are molded with resin 4 and fixed in a shield case 5 made of a shaped conductor and having a ground terminal 5a extending downward. Everything else remains the same, so
The same components are given the same reference numerals and their explanations will be omitted.
本発明による第２の実施例は、第３図に示した従来例と
外観形状は同じであるが、封止する樹脂４に金属粉末を
混入分散した樹脂を用いたものである。The second embodiment according to the present invention has the same external shape as the conventional example shown in FIG. 3, but uses a resin in which metal powder is mixed and dispersed in the sealing resin 4.
第２図は、本発明による第２の実施例の斜視図で、樹脂
４で封止する前の状態を示す。第２の実施例のノイズ除
去フィルタは、Ｔ形フィルタ６の間に黄銅板等の板状導
体からなる接地端子７ａを有するシールド板７を配置し
たものを複数個並べ、Ｔ形フィルタ６を含め樹脂（図示
せず）で封止したものである。FIG. 2 is a perspective view of a second embodiment of the present invention, showing a state before sealing with resin 4. FIG. The noise removal filter of the second embodiment includes a plurality of shield plates 7 arranged between T-shaped filters 6 and having a grounding terminal 7a made of a plate-shaped conductor such as a brass plate. It is sealed with resin (not shown).
（発明の効果）
以上説明したように、本発明によれば、Ｔ形フィルタの
全面又は片面に板状導体からなるシールドケース又はシ
ールド板を設けることにより、あるいは、金属粉末を混
入分散した樹脂で封止することにより、直接ノイズ除去
フィルタに飛来する妨害電磁波によるノイズが防止され
るばかりでなく、インダクタンス相互の結合を小さくし
、ノイズ除去能力を向上する。さらに、複数のＴ形フィ
ルタを並ベブロック化した場合にはノイズ除去フィルタ
相互の結合を防止する効果を有する。(Effects of the Invention) As explained above, according to the present invention, by providing a shield case or a shield plate made of a plate-shaped conductor on the entire surface or one side of the T-type filter, or by providing a shield case or a shield plate made of a plate-shaped conductor, or by using a resin mixed and dispersed with metal powder. Sealing not only prevents noise due to interfering electromagnetic waves directly flying to the noise removal filter, but also reduces mutual coupling between inductances and improves noise removal ability. Furthermore, when a plurality of T-shaped filters are arranged in parallel blocks, there is an effect of preventing coupling between the noise removal filters.
さらに回路内部より発生するノイズの外部への流出を防
止する能力を大幅に向上する。Furthermore, the ability to prevent noise generated from inside the circuit from leaking to the outside is greatly improved.
第１図（ａ）および（ｂ）は本発明による第１の実施例
のノイズ除去フィルタを示す正面断面図および側面断面
図、第２図は本発明の第２の実施例の樹脂封止前のノイ
ズ除去フィルタの斜視図、第３図（ａ）および（ｂ）は
従来のノイズ除去フィルタの正面断面図および側面断面
図である。
１．２ ・・・インダクタンス、３ ・・・コンデンサ
、４ ・・・樹脂、５・・・シールドケース、５ａ、７
ａ・・・接地端子、６・・・Ｔ形フィルタ、７ ・・・
シールド板。
第１図
（ａ） （ｂ）１．２・・
インダクタンス
３ コンナ″ンプ
４・・・相）腸
５・・シ一番ドパケース
５ｑ−倚１も堝３
第２図
６ ”’ Ｔ Ｑ フィ）レタ７ シー７し
ド板 ７ｏ −接迫掲さ第３図1(a) and (b) are a front sectional view and a side sectional view showing a noise removal filter according to a first embodiment of the present invention, and FIG. 2 is a front sectional view and a side sectional view showing a noise removal filter according to a first embodiment of the present invention, and FIG. FIGS. 3A and 3B are a front sectional view and a side sectional view of a conventional noise removal filter. 1.2...Inductance, 3...Capacitor, 4...Resin, 5...Shield case, 5a, 7
a...Ground terminal, 6...T-type filter, 7...
shield board. Figure 1 (a) (b) 1.2...
Inductance 3 Conn'amp 4...Phase) Intestine 5...S first case 5q-倚1 moho 3 Fig. 2 6 ``' Figure 3
Claims (3)
ことを特徴とするノイズ除去フィルタ。(1) A noise removal filter characterized by covering the entire or part of the outer periphery of a T-shaped filter with a conductor.
徴とする請求項（１）記載のノイズ除去フィルタ。(2) The noise removal filter according to claim (1), characterized in that it is sealed with a resin mixed with metal powder.
けたことを特徴とする請求項（１）記載のノイズ除去フ
ィルタ。(3) The noise removal filter according to claim (1), characterized in that a plate-shaped conductor is provided between adjacent T-shaped filters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9019688A JPH01264008A (en) | 1988-04-14 | 1988-04-14 | Noise rejection filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9019688A JPH01264008A (en) | 1988-04-14 | 1988-04-14 | Noise rejection filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01264008A true JPH01264008A (en) | 1989-10-20 |
Family
ID=13991726
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9019688A Pending JPH01264008A (en) | 1988-04-14 | 1988-04-14 | Noise rejection filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01264008A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5532662A (en) * | 1992-10-12 | 1996-07-02 | Matsushita Electric Industrial Co., Ltd. | Inductive component having an opening in the exterior mold |
| JP2009088913A (en) * | 2007-09-28 | 2009-04-23 | Soshin Electric Co Ltd | Noise filter |
-
1988
- 1988-04-14 JP JP9019688A patent/JPH01264008A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5532662A (en) * | 1992-10-12 | 1996-07-02 | Matsushita Electric Industrial Co., Ltd. | Inductive component having an opening in the exterior mold |
| JP2009088913A (en) * | 2007-09-28 | 2009-04-23 | Soshin Electric Co Ltd | Noise filter |
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