JPS5827544Y2 - Shield case for high frequency filter - Google Patents
Shield case for high frequency filterInfo
- Publication number
- JPS5827544Y2 JPS5827544Y2 JP9847076U JP9847076U JPS5827544Y2 JP S5827544 Y2 JPS5827544 Y2 JP S5827544Y2 JP 9847076 U JP9847076 U JP 9847076U JP 9847076 U JP9847076 U JP 9847076U JP S5827544 Y2 JPS5827544 Y2 JP S5827544Y2
- Authority
- JP
- Japan
- Prior art keywords
- shield case
- high frequency
- frequency filter
- thin plate
- iron
- 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.)
- Expired
Links
Landscapes
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Filters And Equalizers (AREA)
Description
【考案の詳細な説明】
本考案は高周波フィルタを収納するシールドケースの改
良に関する。[Detailed Description of the Invention] The present invention relates to an improvement of a shield case that houses a high frequency filter.
このようなシールドケースは高周波信号の漏洩および外
来雑音の遮断のために必要となり、たとえば周波数１０
０ Ｈｚ以上程度の高周波フィルタでは不可欠なもので
ある。Such a shield case is necessary to block high frequency signal leakage and external noise, for example, at frequencies 10
This is indispensable for high frequency filters of approximately 0 Hz or higher.
従来からのシールドケースは真鍮製であったり、渣たは
アルミニムラに銅に銀メッキされた材料等で構成された
。Conventional shield cases have been made of brass, or other materials such as scrap or aluminum plated with copper and silver.
したがって高価なものとなり、また半田付を迅速に行な
うことが難しいなどの欠点がある。Therefore, it is expensive and has drawbacks such as difficulty in soldering quickly.
本考案は安価でしかも高周波のシールド性能に優れた高
周波フィルタ用シールドケースを提供することを目的と
する。An object of the present invention is to provide a shield case for a high frequency filter that is inexpensive and has excellent high frequency shielding performance.
第１図は本考案の一実施例のシールドケース６を含む高
周波フィルタ１の斜視図であり、第２図はその■−■線
視線面断面す。FIG. 1 is a perspective view of a high frequency filter 1 including a shield case 6 according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line ■-■.
この高周波小形フィルタ１は、絶縁性材料から成るプリ
ント基板２上にインダクタンス素子３．コンデンサ４お
よび抵抗５などが取付けられ、これらの回路素子３゜４
．５はシールドケース６内に囲繞収納される。This small high frequency filter 1 has an inductance element 3 mounted on a printed circuit board 2 made of an insulating material. A capacitor 4, a resistor 5, etc. are installed, and these circuit elements 3゜4
．． 5 is enclosed and housed in a shield case 6.
シールドケース６の上部にはインダクタンス素子３のダ
ストコアを位置決めして調節するための透孔１が穿設で
れる。A through hole 1 for positioning and adjusting the dust core of the inductance element 3 is bored in the upper part of the shield case 6.
シールドケース６は、鉄製であり錫筐たは亜鉛によって
メッキされており、そのシールドケース６の内面にはア
ルミニウム、真鍮または銅、その地鉄よジも導電率の良
好な材料から成るフィルム状薄板８が貼着灯れる。The shield case 6 is made of iron and plated with tin or zinc, and the inner surface of the shield case 6 is made of aluminum, brass, or copper, and the base metal is also a thin film-like plate made of a material with good conductivity. 8 is pasted and lit.
この薄板８の厚さはたとえば０．１ ｍｍ−０，３ｍｍ
程度である。The thickness of this thin plate 8 is, for example, 0.1 mm-0.3 mm.
That's about it.
この薄板８はシールドケース６の内面に全面にわたって
貼着されることが好ましいが、内面に部分的に貼着され
てもよい。It is preferable that the thin plate 8 be attached to the entire inner surface of the shield case 6, but it may be attached partially to the inner surface.
第３図は上述の高周波フィルタ１の挿入損失特性ｔ１を
示す。FIG. 3 shows the insertion loss characteristic t1 of the above-mentioned high frequency filter 1.
曲線ｔ２はシールドケース６が無い場合を示し、曲線ｔ
３はシールドケース６が鉄製であって薄板８が貼着され
ない場合を示し、曲線ｔ４はシールドケース６がアルミ
ニウム製の場合を示す。The curve t2 shows the case without the shield case 6, and the curve t2
3 shows the case where the shield case 6 is made of iron and the thin plate 8 is not attached, and the curve t4 shows the case where the shield case 6 is made of aluminum.
このグラフによって、鉄製シールドケース６の内面に鉄
よシも電気導電率の大きい材料の薄板８を貼着したもの
は、曲線ｔ１のようにフィルタとしての挿入損失がｔ２
．ｔ３のものよりも小さいことが判る。According to this graph, when a thin plate 8 made of a material with higher electrical conductivity than iron is attached to the inner surface of the iron shield case 6, the insertion loss as a filter is t2 as shown by the curve t1.
．． It can be seen that it is smaller than that of t3.
したがって鋭い減衰特性が得られる。Therefore, sharp damping characteristics can be obtained.
又この特性曲線中、曲線ｔ１はその薄板８が厚ければ曲
線ｔ４に近づき、逆に薄板８が薄ければ曲線ｔ３に近づ
くため、必要な挿入損失により薄板８の厚さを決定すれ
ばよい。Also, in this characteristic curve, the curve t1 approaches the curve t4 if the thin plate 8 is thick, and conversely approaches the curve t3 if the thin plate 8 is thin, so the thickness of the thin plate 8 can be determined based on the required insertion loss. .
以上のように本考案によれば、半田付の容易な錫メッキ
または亜鉛メッキされた鉄製シールドケースの内面に、
鉄よりも電気導電率の大きい金属材料の薄板を貼着して
成るものであるので、フィルタとしての挿入損失が小さ
り、シたがって大電力で使用しても発熱するおそれはな
く、また前記薄板を貼着したシールドケースは比較的安
価に実現され、さらに減衰特性が鋭くなるなど多大な効
果が奏される。As described above, according to the present invention, on the inner surface of the tin-plated or galvanized iron shield case, which is easy to solder,
Since it is made by pasting a thin plate of a metal material with higher electrical conductivity than iron, the insertion loss as a filter is small, so there is no risk of heat generation even when used at high power, and the above-mentioned A shield case with a thin plate pasted on it can be realized at a relatively low cost and has great effects such as sharper damping characteristics.
第１図は本考案の一実施例を含む高周波フィルタの斜視
図、第２図は第１図の切断面線■−■から見た断面図、
第３図はフィルタの挿入損失を示す図である。
１・・・・・・高周波フィルタ、６・・・・・・錫メッ
キ筐たは亜鉛メッキされた鉄製シールドケース、８・・
・・・・薄板。FIG. 1 is a perspective view of a high frequency filter including an embodiment of the present invention, FIG. 2 is a cross-sectional view taken from the section line ■-■ in FIG. 1,
FIG. 3 is a diagram showing the insertion loss of the filter. 1... High frequency filter, 6... Tin plated case or galvanized iron shield case, 8...
...Thin plate.
Claims (1)
れた鉄製のシールドケースの内面にアルミニウム、真鍮
または銅などの鉄よりも電気導電率の大きい材料から成
る薄板を貼着したことを特徴とする高周波フィルタ用シ
ールドケース。A high-frequency filter characterized in that a thin plate made of a material having higher electrical conductivity than iron, such as aluminum, brass, or copper, is adhered to the inner surface of a tin-plated or galvanized iron shield case that houses the high-frequency filter. shield case.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9847076U JPS5827544Y2 (en) | 1976-07-22 | 1976-07-22 | Shield case for high frequency filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9847076U JPS5827544Y2 (en) | 1976-07-22 | 1976-07-22 | Shield case for high frequency filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5317128U JPS5317128U (en) | 1978-02-14 |
| JPS5827544Y2 true JPS5827544Y2 (en) | 1983-06-15 |
Family
ID=28708803
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9847076U Expired JPS5827544Y2 (en) | 1976-07-22 | 1976-07-22 | Shield case for high frequency filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5827544Y2 (en) |
-
1976
- 1976-07-22 JP JP9847076U patent/JPS5827544Y2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5317128U (en) | 1978-02-14 |
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