JP3597326B2 - High frequency device and electronic device using the same - Google Patents

High frequency device and electronic device using the same Download PDF

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JP3597326B2
JP3597326B2 JP25384096A JP25384096A JP3597326B2 JP 3597326 B2 JP3597326 B2 JP 3597326B2 JP 25384096 A JP25384096 A JP 25384096A JP 25384096 A JP25384096 A JP 25384096A JP 3597326 B2 JP3597326 B2 JP 3597326B2
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terminal
circuit
main board
ground
terminals
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JPH1079590A (en
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正喜 山本
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Alps Alpine Co Ltd
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Alps Electric Co Ltd
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Description

【0001】
【発明の属する技術分野】
本発明はチュ−ナ、RFモジュレ−タ等の高周波機器及びその高周波機器を用いたテレビ、VTR等の電子機器に関する。
【0002】
【従来の技術】
従来の高周波機器、例えばチュ−ナと、このチュ−ナを用いたテレビ等の電子機器を図7及び図8により説明する。図7は従来のチュ−ナの外観斜視図、図8はそのチュ−ナをテレビ等の電子機器に使用した状態を説明する一部断面図である。図7において、チュ−ナのシ−ルドケ−ス1は上下が開口した四角状の枠体2とその開口を塞ぐカバ−3、4とから構成され、内部に回路基板5(図8参照)が収納されている。枠体2の四隅には、枠体2の一方の開口の面よりも外方に突出する取り付け脚6が枠体2の端面から一体形成されている。また、取り付け脚6が形成されている側の開口を塞ぐ四角状の一片側に沿って、複数の孔7が列状に形成されており、この孔7を通してシ−ルドケ−ス1内の回路基板5にとりつけられた複数の回路端子8〜12が外方に突出するようになっている。さらに、カバ−3と4の4周辺には枠体2に嵌合する複数の嵌合爪13が形成されている。
【0003】
回路基板5は、その主面がカバ−3、4の面と平行な状態でシ−ルドケ−ス1内に収納され、この回路基板5には、テレビセット内の他の回路と接続するための複数の回路端子8〜12がシ−ルドケ−ス1の取り付け脚6と同じ方向に立設されている。そして以上のように構成されたチュ−ナは、図8に示すように、テレビセット内のメイン基板14に取り付けられる。即ち、シ−ルドケ−ス1の枠体2に形成された取り付け脚6がメイン基板14に挿通され、メイン基板14に形成された接地導体15にはんだ等で電気的、機械的に接続される。同様に、回路端子8〜12もメイン基板14に挿通され、このメイン基板14に形成された配線導体16〜20にそれぞれ接続される。
【0004】
これらの回路端子8〜12には、入出力信号を伝送する信号系の回路端子と電源電圧、AGC電圧を供給する直流系の回路端子とがある。この従来例では、回路端子8はアンテナ入力端子、回路端子9は選局用のPLLデ−タ信号を導入するPLL端子、回路端子12はチュ−ナからの出力信号を導出する出力端子となっており、ともに信号系の端子である。一方、回路端子10は電源電圧を供給する電源端子、回路端子11はAGC電圧を供給するAGC端子であり、ともに直流系の回路端子である。これらの回路端子8〜12はすべて同じようにカバ−3の孔7から完全に突出してメイン基板14に挿通される。そして直流系の回路端子である電源端子10とAGC端子11はメイン基板14への挿通位置の近傍でメイン基板14に設けた接地導体21に高周波接地用のコンデンサ22で接地されている。この接地導体21はチュ−ナ側とは枠体2の取り付け脚6を介して接続されている。
【0005】
【発明が解決しようとする課題】
従来のチュ−ナは以上のように回路端子8〜12がシ−ルドケ−ス1の孔7からケ−ス1の外方に突出しているため、チュ−ナの組立、調整工程の際、あるいは、後工程であるテレビの組立時にこれら回路端子8〜12が治工具等に接触して変形してしまい、この変形を修正する等の余分な工程を必要としていた。また、テレビの組立時においては、チュ−ナはテレビセットのメイン基板14に取り付けられるが、その場合、メイン基板14上のチュ−ナの周囲には、テレビセット側の種種の回路の回路配線(図示せず)が引き回されている。これらの回路にはチュ−ナで取り扱う信号のレベルよりも大きなレベルの信号を取り扱う回路等がある。また、異なる周波数の信号を取り扱う回路等もある。
【0006】
このようなテレビセット側の回路の信号はチュ−ナにとっては妨害となるものである。しかも、テレビセット側の回路配線がメイン基板14に取り付けられたチュ−ナの周囲で近接して引き回されているのでこの回路配線から放射する信号が容易にチュ−ナの回路端子8〜12に飛びつくことになる。しかるに、直流系の端子である電源端子10とAGC端子11はメイン基板14上でコンデンサ22で高周波的に接地されてはいるが、接地導体21がシ−ルドケ−ス1の四隅に設けたまでの間、取り付け脚6を介してメイン基板14上で長く引き回されており、電源端子10及びAGC端子の近傍では接地インピ−ダンスが無視できなくなり、接地効果が少なくなる。そのため電源端子10、AGC端子11に飛びついたテレビセット側からの信号がチュ−ナ内に伝送され、その結果、チュ−ナの動作に妨害を与えるという問題がある。
【0007】
一方、信号系の回路端子であるアンテナ入力端子8、PLL端子9、出力端子12についてはさらに条件が厳しくなっている。これらの信号系の回路端子8、9、12は信号を伝送する必要があるために直流系の回路端子である電源端子10、AGC端子11のように高周波接地用のコンデンサ21で接地導体15あるいは21等に接地することは信号のレベル低下を招来するためにできない。そのため、電源端子10、AGC端子11に比べてテレビセット側からの信号が飛びつきやすくなっている。しかもアンテナ入力端子8等に飛びついたテレビセット側からの信号はそのままチュ−ナの高周波回路に伝送されるので顕著に妨害を受ける。本発明はこのような回路端子の変形を防止し、また、テレビセット側からの妨害を受けることのないチュ−ナ等の高周波機器及びその高周波機器を用いた電子機器を提供するものである。
【0008】
【課題を解決するための手段】
以上の課題を解決するため、本発明の高周波機器では、シ−ルドケ−スに複数の孔を形成するとともに前記孔から前記シ−ルドケ−ス外方に回路端子を突出し、前記孔の周縁に前記回路端子を囲繞するア−ス端子を形成し、前記アース端子には該アース端子から延在する突片を形成した。
【0009】
また、前記アース端子は前記回路端子を囲繞するように円弧状に形成された複数の舌片状のアース端子からなり、前記突片を前記舌片状のアース端子に延在して設け、前記突片の幅を前記舌片状のアース端子の幅よりも狭くした。
【0010】
また、本発明の電子機器は、前記高周波機器をメイン基板に取り付け、前記メイン基板には前記回路端子を挿通する孔と前記突片を挿通する孔とを形成すると共に、配線導体と接地導体とを形成し、前記回路端子を前記配線導体に接続し、前記突片を前記接地導体に接続した。
【0011】
【発明の実施の形態】
以下、図1〜図6を用いて本発明を説明する。図1は本発明による高周波機器の第一の実施の形態を示す外観斜視図、図2は本発明の高周波機器の使用状態を説明する一部断面図、図3は本発明の高周波機器の使用状態を説明する要部断面図、図4は本発明の高周波機器の第二の実施の形態の要部斜視図、図5は本発明の高周波機器の第三の実施の形態の要部斜視図、図6は本発明の高周波機器の第四の実施の形態の要部斜視図である。
【0012】
まず、図1〜図3に基づいて本発明の高周波機器の第一の実施の形態及びこの高周波機器の使用状態を説明するが、従来と同一部分には同一番号を付してその説明を省略する。本発明ではカバ−3に、孔7から突出する各回路端子8〜12を個別に囲繞するように孔7の周縁から筒状のア−ス端子31をカバ−3に一体でこの回路端子8〜12に並行するように立設形成している。このア−ス端子31は絞り加工でされているが、別体の筒状部材を孔7の周縁にはんだ等で固着してもよい。そしてさらに、この筒状のア−ス端子31の先端には突片32を複数個形成している。突片32の長さはメイン基板14の板厚よりも長くし、突片32の先端までの高さと回路端子8〜12の先端までの高さはほぼ等しく設定されている。
【0013】
このように構成することによって、ア−ス端子8〜12はその周囲を筒部31によって囲まれることになり、回路端子8〜12はその先端のみが筒状のア−ス端子31の先端から突出することになる。
【0014】
次に、以上の構成の高周波機器の使用状態を図2、図3によって説明する。ここで、図3は図2に於けるA部の詳細な断面図である。シ−ルドケ−ス1の枠体2に形成された取り付け脚6がメイン基板14に挿通され、メイン基板14に形成された接地導体15に電気的、機械的に接続され、同様に、回路端子8〜12もメイン基板14に挿通され、このメイン基板14に形成された配線導体16〜20に接続されるのは従来と同じである。本発明ではさらに、図3に詳細に示すようにシ−ルドケ−ス1のカバ−3に形成した筒状のア−ス端子31をメイン基板14上に載置するとともに筒状のア−ス端子31の先端に形成した突片32をメイン基板14に挿通し、この突片32をメイン基板14の裏面側に形成した接地導体33に接続する。そして、直流系の端子である電源端子10、AGC端子11に接続された配線導体18、19と、突片32が接続された接地導体33との間に接地コンデンサ22を接続し、電源端子10、AGC端子11を高周波的に接地するようにしている。
【0015】
このようにすることによって接地導体33は突片32及び筒状のア−ス端子31を介して短い距離でチュ−ナのシ−ルドケ−ス1に接続されるので接地インピ−ダンスが低くなる。また、全ての回路端子8〜12が筒状のア−ス端子31で囲繞される。従って、メイン基板14の回路部から放射されるテレビセット側の信号があっても筒状のア−ス端子31がシ−ルド効果を果たし、回路端子8〜12に飛びつく信号がすくなくなる。また、電源端子10、AGC端子11の場合は、飛びつきの信号があったとしても、接地インピ−ダンスの低い接地導体33に接続されたコンデンサ22によって高周波的に充分に低いインピ−ダンスで接地されているので、飛びつき信号は充分にバイパスされる。また、筒状のア−ス端子31が回路端子8〜12を囲繞しているので回路端子8〜12の変形等を防止する。さらに、メイン基板14にはアース端子31は挿通されず突片32のみが挿通されるのでメイン基板14上の配線の自由度が大きくなる。
【0016】
図4〜図6に本発明の高周波機器の他の実施の形態を示す。これらはいずれも図1で説明した筒状のア−ス端子31を変形したものである。また、図4〜図6で、回路端子としてはアンテナ入力端子8で代表している。図4に示す第二の実施の形態のものは図1の筒状のア−ス端子31を複数(例えば二つ)に分割して孔7の周縁に沿って回路端子8を囲繞するように円弧状に湾曲した幅の広い舌片状のア−ス端子41として構成したものである。そして舌片状のア−ス端子41の先端にメイン基板14挿通用の突片42を延在形成したものである。この第二の実施の形態における舌片状のア−ス端子41は幅広であるので図1の第一の実施の形態の筒状のア−ス端子31とほぼ同程度のシ−ルド効果がある。このア−ス端子41は筒状でないので第一の実施の形態の筒状のア−ス端子に比べて加工性がよい。
【0017】
また、図5に示す第三に実施の形態のものは、図1の筒状のア−ス端子31をさらに分割して回路端子8と高さのほぼ等しい三つの舌片状のア−ス端子43にしたものである。この実施の形態の舌片状のア−ス端子43は図4に第二の実施の形態における舌片状のア−ス端子41よりもやや幅狭とすることができ、加工性がさらによい。また、幅狭であることから図4のような突片42を形成しないでそのままメイン基板14に挿通して接地導体33に接続することができて、メイン基板14上の配線の自由度を阻害する事はない。そして、図1の筒状のア−ス端子31とほぼ同程度のシ−ルド効果がある。
【0018】
さらに、図6は図1の筒状のア−ス端子31の代わりに回路端子8とほぼ高さのほぼ等しい幅狭の一個の舌片状のア−ス端子44を用いるようにしたものである。舌片状のア−ス端子44は一個であるのでシ−ルド効果はやや劣るものの、図5の舌片状のア−ス端子43よりもさらに加工性に優れ、またメイン基板14上の配線の自由度は一層よい。この舌片状のア−ス端子44も幅狭であることから図4のような突片42を設けることなくそのままメイン基板14に挿通し、電源端子10、AGC端子11の接地コンデンサ22の接続用の接地導体33に接続して、この接地導体33の接地インピ−ダンスを低くするのには充分に効果がある。
【0019】
以上述べた変形例の舌片状のア−ス端子41、43、44は使用目的に合わせて、その数及び幅等を種種変更して構成することが可能である。また、図5、6に示した舌片状のア−ス端子43、44には図4に示したような突片42を設けなかったが、このような突片42を設けてその突片42をメイン基板14に挿通するようにしてもよい。その場合はメイン基板14上の配線の自由度はより一層すぐれる。また、これらア−ス端子31、41、43、44はシ−ルドケ−ス1のカバ−3に形成することで説明したが、これに限ることなく、例えば、シ−ルドケ−スの枠体から回路端子を突出するような高周波機器では直接枠体にア−ス端子31、41、43、44を適宜形成してもよい。また有底状のシ−ルドケ−スの底から回路端子を突出するような高周波機器では、直接その底面にア−ス端子31、41、43、44を適宜形成してもよい。
【0020】
【発明の効果】
以上のように、本発明の高周波機器は、シ−ルドケ−スに複数の孔を形成するとともにこの各孔からシ−ルドケ−ス外方に回路端子を突出し、各孔の周縁に回路端子を囲繞するア−ス端子を形成し、アース端子にはアース端子から延在する突片を形成したので、ア−ス端子が回路端子の保護として機能し、回路端子の変形が防止できる。また、回路端子への妨害信号の飛び込みを防ぐシ−ルド効果を奏する。さらに、回路端子と突片とをメイン基板の孔に挿通して接続する際には、アース端子をメイン基板に載置し、回路端子と突片とをメイン基板に挿通して接続できる。また、メイン基板にはアース端子は挿通されずに突片が挿通されるのでメイン基板上の配線の自由度が大きい。
【0021】
また、アース端子は回路端子を囲繞するように円弧状に形成された複数の舌片状のアース端子からなり、突片を舌片状のアース端子に延在して設け、突片の幅を舌片状のアース端子の幅よりも狭くしたので、アース端子の加工性がよい
【0022】
また、本発明の電子機器は、高周波機器をメイン基板に取り付け、メイン基板には回路端子を挿通する孔と突片を挿通する孔とを形成すると共に、配線導体と接地導体とを形成し、回路端子を配線導体に接続し、突片を接地導体に接続したので、メイン基板と接続される回路端子はアース端子によって同軸的に囲繞されるのでインピーダンスが安定すると共に、外部からの妨害信号受けにくい電子機器が構成できる。
【図面の簡単な説明】
【図1】本発明の高周波機器の外観斜視図である。
【図2】本発明の高周波機器の使用状態を説明する一部断面図である。
【図3】本発明の高周波機器の使用状態を説明する要部拡大断面図である。
【図4】本発明の第二の実施の形態の要部斜視図である。
【図5】本発明の第三の実施の形態の要部斜視図である。
【図6】本発明の第四の実施の形態の要部斜視図である。
【図7】従来の高周波機器の外観斜視図である。
【図8】従来の高周波機器の使用状態を説明する一部断面図である。
【符号の説明】
1 ケ−ス
2 枠体
3.4 カバ−
5 回路基板
6 取り付け脚
7 孔
8.9.12 信号系の端子
10.11 直流系の端子
13 嵌合爪
14 メイン基板
15.21.33 接地導体
16.17.18.19.20 配線導体
22 コンデンサ
31 筒状のア−ス端子
32.42 突片
41.43.44 舌片状のア−ス端子
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a high-frequency device such as a tuner and an RF modulator, and an electronic device such as a television and a VTR using the high-frequency device.
[0002]
[Prior art]
A conventional high-frequency device, for example, a tuner and an electronic device such as a television using the tuner will be described with reference to FIGS. FIG. 7 is an external perspective view of a conventional tuner, and FIG. 8 is a partial cross-sectional view illustrating a state where the tuner is used for an electronic device such as a television. In FIG. 7, the shield case 1 of the tuner is composed of a rectangular frame body 2 with upper and lower openings, and covers 3, 4 for closing the opening, and a circuit board 5 inside (see FIG. 8). Is stored. At four corners of the frame 2, mounting legs 6 protruding outward from the surface of one opening of the frame 2 are integrally formed from the end face of the frame 2. In addition, a plurality of holes 7 are formed in a row along one side of a square that closes the opening on the side where the mounting leg 6 is formed, and through this hole 7, a circuit in the shield case 1 is formed. A plurality of circuit terminals 8 to 12 attached to the substrate 5 project outward. Further, a plurality of fitting claws 13 to be fitted to the frame 2 are formed around the covers 3 and 4.
[0003]
The circuit board 5 is housed in the shield case 1 with its main surface parallel to the surfaces of the covers 3 and 4, and is connected to other circuits in the television set. The plurality of circuit terminals 8 to 12 are erected in the same direction as the mounting legs 6 of the shield case 1. The tuner configured as described above is attached to a main board 14 in a television set as shown in FIG. That is, the mounting legs 6 formed on the frame 2 of the shield case 1 are inserted into the main board 14 and are electrically and mechanically connected to the ground conductor 15 formed on the main board 14 by soldering or the like. . Similarly, the circuit terminals 8 to 12 are inserted into the main board 14 and connected to the wiring conductors 16 to 20 formed on the main board 14, respectively.
[0004]
The circuit terminals 8 to 12 include a signal system circuit terminal for transmitting input / output signals and a DC system circuit terminal for supplying a power supply voltage and an AGC voltage. In this conventional example, a circuit terminal 8 is an antenna input terminal, a circuit terminal 9 is a PLL terminal for introducing a PLL data signal for tuning, and a circuit terminal 12 is an output terminal for deriving an output signal from a tuner. And both are signal terminals. On the other hand, the circuit terminal 10 is a power supply terminal for supplying a power supply voltage, and the circuit terminal 11 is an AGC terminal for supplying an AGC voltage, both of which are DC circuit terminals. All of these circuit terminals 8 to 12 completely project from the hole 7 of the cover 3 in the same manner and are inserted into the main board 14. The power supply terminal 10 and the AGC terminal 11, which are DC system circuit terminals, are grounded to a ground conductor 21 provided on the main board 14 near a position where the power supply terminal 10 is inserted into the main board 14 by a high-frequency grounding capacitor 22. This ground conductor 21 is connected to the tuner side via the mounting leg 6 of the frame 2.
[0005]
[Problems to be solved by the invention]
As described above, in the conventional tuner, since the circuit terminals 8 to 12 protrude outward from the case 1 through the holes 7 of the shield case 1 during assembly and adjustment of the tuner, Alternatively, these circuit terminals 8 to 12 are deformed by contact with jigs and the like at the time of assembling the television, which is a post-process, and an extra process such as correcting this deformation is required. In assembling the television, the tuner is attached to the main board 14 of the television set. In this case, around the tuner on the main board 14, circuit wiring of various circuits on the television set side is provided. (Not shown). These circuits include a circuit for handling a signal having a level higher than that of a signal handled by a tuner. There are also circuits that handle signals of different frequencies.
[0006]
Such a signal of the circuit on the television set side is a hindrance to the tuner. Moreover, since the circuit wiring on the side of the television set is routed close to the tuner attached to the main board 14, signals radiated from the circuit wiring can be easily applied to the circuit terminals 8 to 12 of the tuner. Will jump to. The power supply terminal 10 and the AGC terminal 11, which are DC terminals, are grounded at a high frequency on the main board 14 by the capacitor 22, but until the ground conductors 21 are provided at the four corners of the shield case 1. During this time, it is long routed on the main board 14 via the mounting legs 6, and the grounding impedance cannot be ignored near the power supply terminal 10 and the AGC terminal, and the grounding effect is reduced. Therefore, the signal from the television set that jumps to the power supply terminal 10 and the AGC terminal 11 is transmitted into the tuner, and as a result, there is a problem that the operation of the tuner is hindered.
[0007]
On the other hand, conditions for the antenna input terminal 8, the PLL terminal 9, and the output terminal 12, which are signal terminals of the signal system, are more severe. Since the signal terminals 8, 9, and 12 of the signal system need to transmit signals, the power supply terminal 10 and the AGC terminal 11, which are DC system circuit terminals, are connected to the ground conductor 15 or the ground conductor 15 by a capacitor 21 for high frequency grounding. It cannot be grounded to 21 or the like because it causes a decrease in signal level. Therefore, compared to the power supply terminal 10 and the AGC terminal 11, signals from the television set are more likely to jump. Moreover, the signal from the television set, which has jumped to the antenna input terminal 8 or the like, is transmitted to the high frequency circuit of the tuner as it is, so that it is significantly disturbed. An object of the present invention is to provide a high-frequency device such as a tuner and an electronic device using the high-frequency device, which prevent such deformation of the circuit terminal and are not hindered by the television set.
[0008]
[Means for Solving the Problems]
To solve the above problems, the high frequency device of the present invention, shea - Rudoke - said to form a plurality of holes to scan from said each hole is - Rudoke - projecting the circuit terminals to scan outside of each hole An earth terminal surrounding the circuit terminal was formed on the periphery, and a protruding piece extending from the earth terminal was formed on the earth terminal .
[0009]
The ground terminal includes a plurality of tongue-shaped ground terminals formed in an arc shape so as to surround the circuit terminal, and the protruding piece is provided to extend to the tongue-shaped ground terminal. The width of the projecting piece is smaller than the width of the tongue-shaped ground terminal.
[0010]
Further, the electronic device of the present invention attaches the high-frequency device to a main board, forms a hole for inserting the circuit terminal and a hole for inserting the projecting piece in the main board, and includes a wiring conductor and a ground conductor. Was formed, the circuit terminal was connected to the wiring conductor, and the protruding piece was connected to the ground conductor.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described with reference to FIGS. FIG. 1 is an external perspective view showing a first embodiment of a high-frequency device according to the present invention, FIG. 2 is a partial cross-sectional view illustrating a use state of the high-frequency device of the present invention, and FIG. FIG. 4 is a perspective view of a main part of a high-frequency device according to a second embodiment of the present invention, and FIG. 5 is a perspective view of a main portion of a third embodiment of the high-frequency device of the present invention. FIG. 6 is a perspective view showing a main part of a high-frequency device according to a fourth embodiment of the present invention.
[0012]
First, the first embodiment of the high-frequency device of the present invention and the use state of this high-frequency device will be described with reference to FIGS. 1 to 3. I do. In the present invention, a cylindrical ground terminal 31 is integrally formed on the cover 3 from the periphery of the hole 7 so as to individually surround the circuit terminals 8 to 12 protruding from the hole 7. To 12 in parallel with each other. Although the earth terminal 31 is drawn, a separate tubular member may be fixed to the periphery of the hole 7 by soldering or the like. Further, a plurality of protruding pieces 32 are formed at the tip of the cylindrical earth terminal 31. The length of the protruding piece 32 is longer than the plate thickness of the main board 14, and the height to the tip of the protruding piece 32 and the height to the tip of the circuit terminals 8 to 12 are set substantially equal.
[0013]
With such a configuration, the grounding of the earth terminals 8 to 12 is surrounded by the cylindrical portion 31, and the circuit terminals 8 to 12 are formed only from the distal end of the cylindrical grounding terminal 31. It will protrude.
[0014]
Next, the use state of the high-frequency device having the above configuration will be described with reference to FIGS. Here, FIG. 3 is a detailed sectional view of a portion A in FIG. The mounting legs 6 formed on the frame 2 of the shield case 1 are inserted through the main board 14 and are electrically and mechanically connected to the ground conductor 15 formed on the main board 14. 8 to 12 are inserted into the main board 14 and connected to the wiring conductors 16 to 20 formed on the main board 14 as in the conventional case. In the present invention, as shown in detail in FIG. 3, a cylindrical ground terminal 31 formed on the cover 3 of the shield case 1 is placed on the main board 14 and the cylindrical ground terminal 31 is formed. The protruding piece 32 formed at the tip of the terminal 31 is inserted into the main board 14, and this protruding piece 32 is connected to the ground conductor 33 formed on the back side of the main board 14. Then, the ground capacitor 22 is connected between the wiring conductors 18 and 19 connected to the power supply terminal 10 and the AGC terminal 11 which are DC terminals, and the ground conductor 33 to which the protruding piece 32 is connected. , AGC terminal 11 is grounded in a high-frequency manner.
[0015]
In this manner, the grounding conductor 33 is connected to the shield case 1 of the tuner at a short distance via the protruding piece 32 and the cylindrical ground terminal 31, so that the grounding impedance is reduced. . Further, all the circuit terminals 8 to 12 are surrounded by a cylindrical ground terminal 31. Therefore, even if there is a signal on the television set side radiated from the circuit portion of the main board 14, the cylindrical ground terminal 31 exerts a shielding effect, and the signal jumping to the circuit terminals 8 to 12 is reduced. In the case of the power supply terminal 10 and the AGC terminal 11, even if there is a jump signal, the capacitor 22 connected to the ground conductor 33 having a low ground impedance is grounded at a sufficiently low impedance in terms of high frequency. Therefore, the jump signal is sufficiently bypassed. In addition, since the cylindrical ground terminal 31 surrounds the circuit terminals 8 to 12, deformation and the like of the circuit terminals 8 to 12 are prevented. Furthermore, the main board 14 ground terminal 31 is the freedom of the wiring on the main board 14 is larger ing only the protrusion 32 is not inserted is inserted.
[0016]
4 to 6 show another embodiment of the high-frequency device of the present invention. These are all modifications of the cylindrical ground terminal 31 described with reference to FIG. 4 to 6, the antenna input terminal 8 is represented as a circuit terminal. In the second embodiment shown in FIG. 4, the cylindrical ground terminal 31 of FIG. 1 is divided into a plurality (for example, two) so as to surround the circuit terminal 8 along the periphery of the hole 7. This is configured as a wide tongue-shaped ground terminal 41 curved in an arc shape. The tongue-shaped ground terminal 41 has a protruding piece 42 extending therethrough at the end thereof. Since the tongue-shaped ground terminal 41 of the second embodiment is wide, the shielding effect is substantially the same as that of the cylindrical ground terminal 31 of the first embodiment shown in FIG. is there. Since the ground terminal 41 is not cylindrical, the workability is better than that of the cylindrical ground terminal of the first embodiment.
[0017]
In the third embodiment shown in FIG. 5, the cylindrical ground terminal 31 shown in FIG. 1 is further divided into three tongue-shaped grounds approximately equal in height to the circuit terminal 8. The terminal 43 is used. The tongue-shaped ground terminal 43 of this embodiment can be made slightly narrower than the tongue-shaped ground terminal 41 of the second embodiment in FIG. . In addition, since the width is narrow, it can be inserted into the main board 14 and connected to the ground conductor 33 without forming the projecting piece 42 as shown in FIG. Nothing to do. The shield effect is almost the same as that of the cylindrical ground terminal 31 shown in FIG.
[0018]
Further, FIG. 6 shows a configuration in which a single tongue-shaped ground terminal 44 having a width substantially equal to that of the circuit terminal 8 is used instead of the cylindrical ground terminal 31 of FIG. is there. Although the shielding effect is somewhat inferior because the number of tongue-shaped ground terminals 44 is one, it is more excellent in workability than the tongue-shaped ground terminals 43 of FIG. The degree of freedom is even better. Since the tongue-shaped ground terminal 44 is also narrow, it is inserted directly into the main board 14 without providing the protruding piece 42 as shown in FIG. 4 to connect the power supply terminal 10 and the ground capacitor 22 of the AGC terminal 11. To the grounding conductor 33 for the purpose of lowering the grounding impedance of the grounding conductor 33.
[0019]
The tongue-shaped ground terminals 41, 43, and 44 of the modified examples described above can be configured by changing the number, width, and the like of the terminals in accordance with the purpose of use. Further, the tongue-shaped ground terminals 43 and 44 shown in FIGS. 5 and 6 are not provided with the projection 42 as shown in FIG. 42 may be inserted into the main board 14. In that case, the degree of freedom of wiring on the main board 14 is further improved. The ground terminals 31, 41, 43, and 44 are described as being formed on the cover 3 of the shield case 1. However, the present invention is not limited to this. For example, the frame case of the shield case 1 may be used. In a high-frequency device in which a circuit terminal protrudes from the frame terminal, the earth terminals 31, 41, 43, and 44 may be formed directly on the frame. In a high-frequency device in which circuit terminals protrude from the bottom of a bottomed shield case, the earth terminals 31, 41, 43, and 44 may be formed directly on the bottom surface as appropriate.
[0020]
【The invention's effect】
As described above, in the high-frequency device of the present invention, a plurality of holes are formed in the shield case, and the circuit terminals protrude from the respective holes to the outside of the shield case. Since the surrounding earth terminal is formed, and the protruding piece extending from the ground terminal is formed on the ground terminal, the ground terminal functions as protection of the circuit terminal, and deformation of the circuit terminal can be prevented. In addition, a shield effect for preventing an interference signal from entering a circuit terminal is provided. Further, when connecting the circuit terminal and the projecting piece by inserting them into the holes of the main board, the ground terminal can be placed on the main board, and the circuit terminal and the projecting piece can be inserted and connected to the main board. Further, since the protruding piece is inserted into the main board without inserting the ground terminal, the degree of freedom of wiring on the main board is large.
[0021]
The ground terminal includes a plurality of tongue-shaped ground terminals formed in an arc shape so as to surround the circuit terminal. Since the width of the tongue-shaped ground terminal is narrower, the workability of the ground terminal is good .
[0022]
Further, the electronic device of the present invention attaches the high-frequency device to the main board, forms a hole for inserting a circuit terminal and a hole for inserting a protruding piece in the main board, and forms a wiring conductor and a ground conductor, The circuit terminals are connected to the wiring conductors, and the protruding pieces are connected to the ground conductor, so that the circuit terminals connected to the main board are coaxially surrounded by the ground terminals, so that the impedance is stabilized and the external interference signal is received. A difficult electronic device can be configured.
[Brief description of the drawings]
FIG. 1 is an external perspective view of a high-frequency device according to the present invention.
FIG. 2 is a partial cross-sectional view illustrating a use state of the high-frequency device of the present invention.
FIG. 3 is an enlarged sectional view of a main part for explaining a use state of the high-frequency device of the present invention.
FIG. 4 is a perspective view of a main part of a second embodiment of the present invention.
FIG. 5 is a perspective view of a main part of a third embodiment of the present invention.
FIG. 6 is a perspective view of a main part of a fourth embodiment of the present invention.
FIG. 7 is an external perspective view of a conventional high-frequency device.
FIG. 8 is a partial cross-sectional view illustrating a usage state of a conventional high-frequency device.
[Explanation of symbols]
1 Case 2 Frame 3.4 Cover
5 Circuit board 6 Mounting leg 7 Hole 8.9.12 Signal system terminal 10.11 DC system terminal 13 Fitting claw 14 Main board 15.2.1.33 Ground conductor 16.17.18.19.20 Wiring conductor 22 Capacitor 31 Cylindrical ground terminal 32.42 Projecting piece 41.43.44 Tongue-shaped ground terminal

Claims (3)

シ−ルドケ−スに複数の孔を形成するとともに前記各孔から前記シ−ルドケ−ス外方に回路端子を突出し、前記孔の周縁に前記回路端子を囲繞するア−ス端子を形成し、前記アース端子には該アース端子から延在する突片を形成したことを特徴とする高周波機器。A plurality of holes are formed in the shield case, and circuit terminals protrude from the respective holes to the outside of the shield case, and an earth terminal surrounding the circuit terminals is formed on the periphery of each hole. A high-frequency device , wherein a protrusion extending from the ground terminal is formed on the ground terminal . 前記アース端子は前記回路端子を囲繞するように円弧状に形成された複数の舌片状のアース端子からなり、前記突片を前記舌片状のアース端子に延在して設け、前記突片の幅を前記舌片状のアース端子の幅よりも狭くしたことを特徴とする請求項1に記載の高周波機器。The ground terminal includes a plurality of tongue-shaped ground terminals formed in an arc shape so as to surround the circuit terminal, and the protruding piece is provided so as to extend from the tongue-shaped ground terminal. 2. The high-frequency device according to claim 1, wherein the width of the tongue-shaped ground terminal is smaller than the width of the tongue-shaped ground terminal . 請求項1又は2に記載の高周波機器をメイン基板に取り付け、前記メイン基板には前記回路端子を挿通する孔と前記突片を挿通する孔とを形成すると共に、配線導体と接地導体とを形成し、前記回路端子を前記配線導体に接続し、前記突片を前記接地導体に接続したことを特徴とする電子機器。3. The high-frequency device according to claim 1, wherein the high-frequency device is mounted on a main board, and the main board is formed with a hole for inserting the circuit terminal and a hole for inserting the projecting piece, and a wiring conductor and a ground conductor are formed. An electronic device, wherein the circuit terminal is connected to the wiring conductor, and the protruding piece is connected to the ground conductor.
JP25384096A 1996-09-04 1996-09-04 High frequency device and electronic device using the same Expired - Fee Related JP3597326B2 (en)

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JPS636892A (en) * 1986-06-27 1988-01-12 大倉電気株式会社 Radio frequency connection between printed wiring boards
JP2575423Y2 (en) * 1989-05-18 1998-06-25 アルプス電気株式会社 Connector mounting structure
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JPH06296103A (en) * 1993-04-08 1994-10-21 Fuji Elelctrochem Co Ltd Dielectric filter
JPH0851581A (en) * 1994-08-09 1996-02-20 Matsushita Electric Ind Co Ltd Tuner
JPH08195574A (en) * 1995-01-17 1996-07-30 Mitsubishi Electric Corp Microwave feeder circuit device, and attaching method of wave untransmissive member

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