JPH0738345B2 - High frequency transformer - Google Patents
High frequency transformerInfo
- Publication number
- JPH0738345B2 JPH0738345B2 JP59102901A JP10290184A JPH0738345B2 JP H0738345 B2 JPH0738345 B2 JP H0738345B2 JP 59102901 A JP59102901 A JP 59102901A JP 10290184 A JP10290184 A JP 10290184A JP H0738345 B2 JPH0738345 B2 JP H0738345B2
- Authority
- JP
- Japan
- Prior art keywords
- opening
- coil
- core
- frequency transformer
- shield case
- 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 - Lifetime
Links
- 239000002184 metal Substances 0.000 claims description 19
- 230000000694 effects Effects 0.000 description 4
- 230000004907 flux Effects 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F21/00—Variable inductances or transformers of the signal type
- H01F21/02—Variable inductances or transformers of the signal type continuously variable, e.g. variometers
- H01F21/06—Variable inductances or transformers of the signal type continuously variable, e.g. variometers by movement of core or part of core relative to the windings as a whole
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Coils Or Transformers For Communication (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は各種電子機器に使用される高周波変成器に関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high frequency transformer used in various electronic devices.
従来例の構成とその問題点 従来この種の高周波変成器は第１図，第２図に示すよう
に構成されていた。すなわち、コイル１を巻回したボビ
ン２は端子板３に嵌合固着されており、ボビン２の中心
部にはコイル１に対応して位置を変動するネジコア４を
設け、且つ、コイル１の外周部にはコア保持モールド５
に保持された上面に開口部をもった磁気シールドコア６
を備え、さらに磁気シールドコア６の開口部より小径の
開口部をもった金属製シールドケース７が被せられて高
周波変成器が形成されていた。Configuration of Conventional Example and Problems Thereof Conventionally, this type of high-frequency transformer has been constructed as shown in FIGS. That is, the bobbin 2 around which the coil 1 is wound is fitted and fixed to the terminal board 3, the bobbin 2 is provided with a screw core 4 whose position varies corresponding to the coil 1, and the outer circumference of the coil 1 is provided. The core holding mold 5
Magnetic shield core 6 having an opening on the upper surface held by
And a metal shield case 7 having an opening having a diameter smaller than that of the magnetic shield core 6 is covered to form a high frequency transformer.
この場合、磁気シールドコア６の開口部の存在によって
漏洩した磁束が外装の金属製シールドケース７での金属
近接効果、特に磁束の軸方向である金属製シールドケー
ス７の上部に小径の開口部を設けているため、金属製シ
ールドケース７がショートリングの働きをして逆起電力
を発生させ、コイルのＱがダンピングされ、高周波変成
器の性能を劣化させていた。In this case, the magnetic flux leaked due to the presence of the opening of the magnetic shield core 6 has a metal proximity effect in the metallic shield case 7 of the exterior, and particularly a small-diameter opening is formed in the upper part of the metal shield case 7 in the axial direction of the magnetic flux. Since it is provided, the metal shield case 7 functions as a short ring to generate a counter electromotive force, the Q of the coil is damped, and the performance of the high frequency transformer is deteriorated.
発明の目的 本発明はこのような従来の欠点を除去するもので、金属
製シールドケースがコイルに近接することでコイルのＱ
が低下する等の性能劣化が生じにくい高周波変成器を提
供することを目的とする。OBJECT OF THE INVENTION The present invention eliminates the above-mentioned conventional drawbacks, and the metal shield case is close to the coil, so that the Q
It is an object of the present invention to provide a high-frequency transformer in which performance deterioration such as decrease in performance does not easily occur.
発明の構成 この目的を達成するために本発明の高周波変成器は、外
装の金属製シールドケースの上面の開口部径を磁気シー
ルドコアの上面の開口部径の1.1〜1.4倍にすることで金
属製シールドケースがコイルのＱ特性に与える影響を少
なくすることができる。In order to achieve this object, the high frequency transformer of the present invention is a metal by making the opening diameter of the upper surface of the metallic shield case of the exterior 1.1 to 1.4 times the opening diameter of the upper surface of the magnetic shield core. It is possible to reduce the influence of the shield case made on the Q characteristic of the coil.
実施例の説明 以下本発明の一実施例について、図面第３図，第４図を
参照しながら説明する。Description of Embodiments One embodiment of the present invention will be described below with reference to FIGS. 3 and 4.
第３図は本発明の高周波変成器の斜視図を、第４図は本
発明の一実施例における高周波変成器の断面図を示して
おり、11はボビン12の上部に巻回されたコイルであり、
13は熱硬化性樹脂で構成された端子板でボビン12の下部
に結合されている。14はボビン12の中心孔に螺合され、
コイル11に対して上下動できるネジコアである。この端
子板13にボビン12を結合したものにコア保持モールド体
15を被せ、このコア保持モールド体15には、上面に開口
部16aを設けた磁気シールドコア16を挿入保持させてい
る。更に全体には上面に開口部17aを有する金属製シー
ルドケース17が被せられて構成されている。FIG. 3 is a perspective view of the high-frequency transformer of the present invention, and FIG. 4 is a sectional view of the high-frequency transformer according to one embodiment of the present invention. 11 is a coil wound around the upper portion of the bobbin 12. Yes,
Reference numeral 13 is a terminal plate made of a thermosetting resin and is connected to the lower portion of the bobbin 12. 14 is screwed into the center hole of the bobbin 12,
A screw core that can move up and down with respect to the coil 11. The core holding mold body is formed by connecting the bobbin 12 to the terminal board 13.
The core holding mold body 15 is covered with a magnetic shield core 16 having an opening 16a on its upper surface. Further, the entire surface is covered with a metal shield case 17 having an opening 17a on its upper surface.
このような構成で、金属製シールドケース17の上面の開
口部17aの開口径を磁気シールドコア16の上面の開口部1
6aの1.1〜1.4倍にすることで金属製シールドケース17の
影響を少なくしている。すなわち、金属製シールドケー
ス17の開口部17aを大きくすることによって磁気シール
ドコア16の開口部16aで漏洩した磁束が存在しても金属
製シールドケース17がショートリングとしての機能をほ
とんど果たさず逆起電力の発生を抑え、その結果として
コイル11のＱが低下するのを防止することができる。With such a configuration, the opening diameter of the opening 17a on the upper surface of the metal shield case 17 is set to the opening 1 on the upper surface of the magnetic shield core 16.
The influence of the metal shield case 17 is reduced by increasing the value from 1.1 to 1.4 times that of 6a. That is, by enlarging the opening 17a of the metal shield case 17, even if there is a magnetic flux leaked in the opening 16a of the magnetic shield core 16, the metal shield case 17 hardly performs the function as a short ring and back-ups. Generation of electric power can be suppressed, and as a result, Q of the coil 11 can be prevented from decreasing.
上記金属製シールドケース17の上面の開口部17aの開口
径を磁気シールドコア16の上面の開口部16aの開口径の
1.1〜1.4倍にするのは、第５図に示すようにコイルのＱ
の低下をできる限り少なくするためである。第５図にお
いて、上記開口径が1.1倍以下であると、コイルのＱが
ベストの状態100％から95％以下となり低下率が大きく
なる。また、開口径が1.4倍以上になるとコイルのＱの
低下率は実質的に０となるが、1.4倍以上になると静電
シールドの効果が著しく低下し、金属製シールドケース
17を用いた効果が実質的に得られなくなる。The opening diameter of the opening 17a on the upper surface of the metal shield case 17 is set to the opening diameter of the opening 16a on the upper surface of the magnetic shield core 16.
1.1 to 1.4 times the Q of the coil as shown in Fig. 5
This is to minimize the decrease in In FIG. 5, when the opening diameter is 1.1 times or less, the Q of the coil becomes 95% or less from 100% in the best state, and the reduction rate becomes large. Also, when the opening diameter is 1.4 times or more, the reduction rate of Q of the coil is substantially 0, but when it is 1.4 times or more, the effect of the electrostatic shield is significantly reduced, and the metal shield case
The effect of using 17 cannot be obtained substantially.
なお、第５図は、磁気シールドコア16の開口部16aの寸
法を一定とし、金属製シールドケース17の開口部17aの
開口径を変化させた時のコイルのＱの低下率の変化を測
定した結果を示している。In FIG. 5, the size of the opening 16a of the magnetic shield core 16 was kept constant, and the change in the Q reduction rate of the coil was measured when the opening diameter of the opening 17a of the metal shield case 17 was changed. The results are shown.
発明の効果 以上のように本発明の高周波変成器は、金属製シールド
ケースの上部の開口部径を磁気シールドコアの上部開口
部径の1.1〜1.4倍にすることで静電シールドの効果を妨
げることなく、コイルのＱの低下を少なくしたものであ
る。As described above, in the high frequency transformer of the present invention, the effect of the electrostatic shield is hindered by making the diameter of the upper opening of the metal shield case 1.1 to 1.4 times the diameter of the upper opening of the magnetic shield core. Without decreasing the Q of the coil.
このような高いＱ特性は音声回路等高い共振インピーダ
ンスを要求される各種回路に幅広く効果を発揮する極め
て実用性の高いものである。Such a high Q characteristic is extremely practical and widely effective in various circuits that require high resonance impedance such as a voice circuit.
第１図は従来の高周波変成器の斜視図、第２図は一部切
欠正面図、第３図は本発明の斜視図、第４図は本発明の
一実施例による高周波変成器の一部切欠正面図、第５図
は金属製シールドケースの上部開口部径と磁気シールド
コアの上部開口部径との比率に対するＱ低下率を示す特
性図である。 11……コイル、12……ボビン、13……端子板、14……コ
ア、15……コア保持モールド体、16……磁気シールドコ
ア、16a……開口部、17……金属製シールドケース、17a
……開口部。FIG. 1 is a perspective view of a conventional high frequency transformer, FIG. 2 is a partially cutaway front view, FIG. 3 is a perspective view of the present invention, and FIG. 4 is a portion of a high frequency transformer according to an embodiment of the present invention. FIG. 5 is a front view of a notch, and FIG. 5 is a characteristic diagram showing the Q reduction rate with respect to the ratio of the diameter of the upper opening of the metal shield case and the diameter of the upper opening of the magnetic shield core. 11 …… coil, 12 …… bobbin, 13 …… terminal plate, 14 …… core, 15 …… core holding mold, 16 …… magnetic shield core, 16a …… opening, 17 …… metal shield case, 17a
……Aperture.
Claims (1)
に対応して位置を変動するコアを有し、コイルの外周部
に上面に開口部を有する磁気シールドコアを設け、全体
に上面に開口部を有する金属製シールドケースを被せ、
且つ、磁気シールドコアの上面の開口部径よりも金属製
シールドケースの上面の開口部径を1.1〜1.4倍に設定し
た高周波変成器。1. A bobbin around which a coil is wound has a core whose position fluctuates corresponding to the coil, and a magnetic shield core having an opening on the upper surface is provided on the outer periphery of the coil, and the entire upper surface is covered with the magnetic shield core. Cover with a metal shield case with an opening,
Moreover, a high frequency transformer in which the opening diameter of the upper surface of the metal shield case is set to 1.1 to 1.4 times the opening diameter of the upper surface of the magnetic shield core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59102901A JPH0738345B2 (en) | 1984-05-22 | 1984-05-22 | High frequency transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59102901A JPH0738345B2 (en) | 1984-05-22 | 1984-05-22 | High frequency transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60246607A JPS60246607A (en) | 1985-12-06 |
| JPH0738345B2 true JPH0738345B2 (en) | 1995-04-26 |
Family
ID=14339761
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59102901A Expired - Lifetime JPH0738345B2 (en) | 1984-05-22 | 1984-05-22 | High frequency transformer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0738345B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7143583B2 (en) * | 2017-11-28 | 2022-09-29 | Tdk株式会社 | Coil device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5584914U (en) * | 1978-12-07 | 1980-06-11 |
-
1984
- 1984-05-22 JP JP59102901A patent/JPH0738345B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60246607A (en) | 1985-12-06 |
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