JP4464067B2

JP4464067B2 - TV terminal

Info

Publication number: JP4464067B2
Application number: JP2003113221A
Authority: JP
Inventors: 良治森本
Original assignee: Maspro Denkoh Corp
Current assignee: Maspro Denkoh Corp
Priority date: 2003-04-17
Filing date: 2003-04-17
Publication date: 2010-05-19
Anticipated expiration: 2023-04-17
Also published as: JP2004320548A

Description

【０００１】
【発明の属する技術分野】
本発明は，主にテレビの共同受信施設において使用するテレビ端子に関し，詳しくはその家屋の壁面に埋め込み状に備えたアウトレットボックスに取付けて使用するボックス取付用のテレビ端子に関する。
【０００２】
【従来の技術】
近年において，従来からあるＶＨＦ・ＵＨＦの地上波やＣＳ放送だけでなく，新たにＢＳ・１１０°ＣＳデジタル放送や地上波デジタル放送等から送られる，高画質・高品質な放送がなされるようになり多チャンネル化が進んでいる。こうした背景において，デジタル放送はその特長を最大に楽しむために，上述のデジタル放送波を直接受信する方法が良い。ところが，こうした多衛星からの放送をすべて受信しようとすると，１１０°ＣＳデジタル放送と従来からあるＣＳ放送のＣＳ−ＩＦ帯の伝送周波数帯が重なるため，宅内へ引き込む同軸線は少なくとも２系統必要となる。この場合，宅内のテレビ端子は，テレビ端子を２つ付けるタイプのアウトレットボックスを取付けてテレビ端子を２端子とするか，２入力，２出力の同軸２系統配線用のテレビ端子を取付ける方法があった。
一方で，都市型ＣＡＴＶの普及や住宅等の美観から，従来からの放送は，ＣＡＴＶを利用するケースも増えてきた。更に，ＣＡＴＶに加入すれば，インターネットのブロードバンド接続が可能となる利点があり，この点においてもＣＡＴＶの加入する場合が増えてきた。
このような場合は，自宅への引き込み線は，衛星アンテナからの同軸ケーブルと，ＣＡＴＶ回線からの同軸ケーブルの２条配線となり，宅内のテレビ端子は２端子必要となった。
上述のような同軸ケーブルの２系統の配線例においては，テレビ端子のアウトレットボックスにテレビ端子を２つ付けるタイプの物を取付けるか，（例えば，特許文献参照）アウトレットボックスを２つ設置してテレビ端子を２つにする方法があった。
【０００３】
【特許文献】
特開２００２−２５７２２号公報
【０００４】
【発明が解決しようとする課題】
しかし，従来のアウトレットボックスを２つ設置してテレビ端子を２つ取付ける方法は，壁面の取り付けスペースが広くなくてはいけないし，取付け工事の工数が大幅にかかり，これに伴い工事費が高くなると言った問題があった。
また，公報に示す例では，小型のテレビ端子を２つ取付けて省スペースで２端子を提供できるものであるが，例えば，上述の例のように２端子の内１端子をＣＡＴＶに接続したとすると，この端子から，上記ＣＡＴＶのセンター装置側に流合雑音が流れ込まないよう，上り信号を阻止するための対策が必要となる。
ところが，アウトレットボックス内の限られたスペースにおいて，同軸２系統の配線を行うためには，１つ１つのテレビ端子の大きさが限定され，上述のように，少なくとも１端子側に流合雑音に対する上り信号阻止対策を行うと，テレビ端子が奥行方向に対して大きくなり，従来の例では，一方の側への同軸ケーブルの配線ができないといった問題があった。
そこで本発明においては，上記従来の技術の問題点を解決するためになされたものであり，
その目的は，同軸２系統の配線に適した２端子型のテレビ端子を提供することにある。
他の目的は，同軸２系統の配線に適した，入力端子及び出力端子がケース本体に一体的に形成されたテレビ端子を提供することにある。
他の目的は，相互に干渉し易いような伝送周波数帯域を伝送する，同軸２系統の配線に適したテレビ端子を提供することにある。
他の目的は，同軸２系統配線用の２端子型のテレビ端子において，少なくとも一方の端子には，上り信号阻止対策手段を備えたテレビ端子を提供することにある。
他の目的は，同軸２系統配線用の２端子型のテレビ端子において，少なくとも一方の端子には，上り信号阻止対策手段を備えると共に，当該上り信号阻止対策手段を，切替手段を用いて入り切り自在にしたことを特徴とするテレビ端子を提供することにある。
他の目的は，同軸２系統配線用の２端子型のテレビ端子において，少なくとも一方の端子には，切替手段を用いて入り切り自在にした上り信号阻止対策手段を備えると共に，上記切替手段の操作部をケース本体の表面側側から操作できるようにしたテレビ端子を提供することに有る。
【０００５】
【課題を解決するための手段】
上記課題を解決するためになされた請求項１に記載の発明は，
電子回路を収納するためのシールド構造に形成された空間を有する筐体と，
筐体の前側面に相互に離間させて配置された２つの出力端子と，
筐体の後側にあって前記出力端子の配置方向と直交する方向に，相互に離間させて配置された２つの入力端子とを備えるテレビ端子において，
前記筐体には，前記空間として，前記２つの出力端子の一方と前記２つの入力端子とが配置される第１の電子回路収納室と，前記２つの出力端子の他方が配置される第２の電子回路収納室と，が形成されており，
前記第１の電子回路収納室には，当該第１の電子回路収納室に配置された出力端子と一方の入力端子とを接続するための第１の接続経路と，当該第１の電子回路収納室に配置された他方の入力端子を前記第２の電子回路収納室に配置された出力端子に接続するための第２の接続経路と，からなる第１の電子回路が収納されており，
前記第２の電子回路収納室には，当該第２の電子回路収納室に配置された出力端子を前記第１の電子回路収納室に配置された他方の入力端子に接続するための第３の接続経路と，該第３の接続経路で前記出力端子から前記入力端子側へと流れる，ＣＡＴＶシステムにおける上り信号を阻止する上り信号阻止用フィルターと，からなる第２の電子回路が収納されており，
しかも，前記第１の電子回路収納室と前記第２の電子回路収納室との間には，前記第２の接続経路と前記第３の接続経路とを接続する経路を通すための透孔が形成されていることを特徴とする。
【０００６】
また，請求項２に記載の発明は，請求項１に記載のテレビ端子において，
ＣＡＴＶシステムにおける上り信号を阻止する前記上り信号阻止用フィルターは，
前記第３の接続経路上に設けられ，前記上り信号の通過を阻止し，前記入力端子から前記出力端子側に流れる下り信号を通過させるハイパスフィルターと，
前記第３の接続経路とグランドとの間に設けられ，前記下り信号の通過を阻止し，前記上り信号を通過させるローパスフィルターと，
前記ローパスフィルターに対し直列に接続された抵抗と，
から構成されていることを特徴とする。
【０００７】
次に，請求項３に記載の発明は，請求項１又は請求項２に記載のテレビ端子において，前記第３の接続経路には，ＣＡＴＶシステムにおける双方向信号用回線と，前記上り信号用阻止フィルターを備えた下り信号用回線と，前記双方向信号用回線と下り信号用回線とを切替える切替手段と，が設けられていることを特徴とする。
【０００８】
また，請求項４に記載の発明は，請求項３に記載のテレビ端子において，前記切替手段における操作部は，筐体の前側側から操作を可能に表出自在にしてあることを特徴とする。
【０００９】
【発明の実施の形態】
以下に，本発明を具体化した実施形態例を，図面を基に詳細に説明する。
図１（Ａ）は正面図，（Ｂ）Ａ−Ａ位置断面図。図２は図１（Ｂ）のＢ−Ｂ位置断面図であって，テレビ端子における電子回路収納室６の裏蓋を除いた状態を示す図。図３は上方向から見た電子回路収納室３の上蓋を除いた状態を示す図。図４（Ａ）は結線図，（Ｂ）はフィルター２０の回路ブロック図である。
図５は他の実施例であり，（Ａ）は正面図，（Ｂ）Ｃ−Ｃ位置断面図。図６は図５（Ｂ）のＤ−Ｄ位置断面図であって，テレビ端子における電子回路収納室６の裏蓋を除いた状態を示す図。図７は図５の実施例において，上方向から見た電子回路収納室３の上蓋を除いた状態を示す図。図８（Ａ）は結線図，（Ｂ）は単方向・双方向切替回路３０の回路ブロック図である。
【００１０】
まず図１乃至図４に示す実施例について説明する。１００は周知のアウトレットボックスであり，１は当該アウトレットボックス１００の内部に収納した状態の埋め込み型もしくは露出型のテレビ端子を示す。
上記テレビ端子１は筐体２を有し，当該筐体２には電子回路を収納するためのシールド構造の空間が形成されている。この空間は，後側方向に長く空間を有する第１の電子回路収納室３と，前側面に平行方向に長く空間を有する第２の電子回路収納室６とを備えている。更に，この実施例では上記筐体２の前側面に２つの出力端子１０，１１と，空間の後側に２つの入力端子１２，１３を備えさせてある。
【００１１】
上記筐体２において，２ａは基体であり，通常周知のダイカスト製法によって一体的に塑性的に成形されており，上記出力端子１０，１１は，この基体２ａの前側面に付設されている。上記電子回路収納室３，６と入力端子１２，１３は，この基体２ａの後側に敷設されている。
【００１２】
次に上記筐体２について更に詳しく説明する。筐体２の後側の上方寄りに設けられている第１の電子回路収納室３は，上記基体２ａと一体材であるアルミ材を用いて，上側方向を開口した箱状に形成されており，上記第１の電子回路収納室３の開口部３ａに着脱自在にした導電性を備えた材料で形成されている上蓋５とでもってシールド構造とし，第１の電子回路収納３の内部に空間４を形成している。
次に，上記基体２ａの後側に設けられている第２の電子回路収納室６は，筐体２の背面側を取り囲むような大きさで，上記基体２ａと一体材であるアルミ材を用いて，筐体２の後側方向を開口した箱状に形成されており，上記第２の電子回路収納室６の開口部６ａに着脱自在にした導電性を備えた材料で形成されている後蓋８とでもってシールド構造とし，第２の電子回路収納室６の内部に空間７を形成している。
これらの電子回路収納室３，６の内面には，後述する電子回路である基板を固定する周知の基板支持用の段部９が，必要に応じて基体２ａと一体材で形成されている。
【００１３】
上記出力端子１０，１１は筐体２の前側面に相互に上下方向に離間させて配置してある。この出力端子１０，１１は，例えば筐体２と一体材であるアルミ材を用いて，前側面方向に突出形成された中空の外部導体１０ａ，１１ａと，これらの外部導体に挿入される中空の絶縁体と，この絶縁体の中心部に配置された中心導体１０ｂ，１１ｂとから構成されている。この出力端子１０，１１は通常，接栓もしくはコネクターと呼ばれるものであり，実施例に限定されず別体形成してある接栓を装着利用してもよい。
【００１４】
上記入力端子１２，１３は筐体２の後側，詳しく言えば，上記第２の電子回路収納室６の後側の位置にあって，基体２ａにつながる上記第１の電子回路収納室３の底壁３ｂから下方に向けて一体に突出成形されている中空の外部導体１２ａ，１３ａと，これらの外部導体に挿入される中空の絶縁体と，この絶縁体の中心部に配置された中心導体１２ｂ，１３ｂとから構成されている。
この入力端子１２，１３は，相互に左右方向に大きく離間させて配置すると共に，上記第２の電気回路収納室６の後側における空間を大きくするような位置に配置され，この入力端子１２，１３に対して通常行われるケーブル接続作業に支障が無いように形成されている。
この入力端子１２，１３は通常，接栓もしくはコネクターと呼ばれるものであり，実施例に限定されず別体形成してある接栓を装着利用してもよいことはいうまでも無い。
【００１５】
この実施例では，一方の入力端子１２は，筐体２の上方位置にある出力端子１０に対して，上記第１の電子回路収納室３に収納された電子回路１５と当該電子回路１５と出力端子１０の中心導体１０ｂを接続する導線１４とを介して接続されている。
他方の入力端子１３は，筐体２の下方位置にある出力端子１１に対して，上記第１の電子回路収納室３に収納された電子回路１５と，上記第２の電気回路収納室６に収納された電子回路１８とを介して接続されている。
尚，本発明の実施例における入力端子１２，１３と出力端子１０，１１との接続の組合せは一例であり，この実施例に限定されるものではない。
【００１６】
１５は第１の電子回路収納室３に収納された電子回路を示し，必要に応じて要求される高周波特性に応じた電子回路が配設してある。この電子回路１５の実施例では，入力端子１２と出力端子１０とは，電子回路１５に形成された伝送経路１５ａと，当該伝送経路１５ａと出力端子１０の中心導体１０ｂを接続する導線１４とを介して接続されるよう形成されている。加えて，電子回路１５には，入力端子１３から電子回路１８に向けて信号を送る為の伝送線路１５ｂが形成されている。
電子回路１５には，後述するプリント基板の突出部１８ａとの連結を行う透孔２５ａを有する連結部２５を備えており，当該連結部２５において，電子回路１５に形成された伝送線路１５ｂの出力端と，電子回路１８に形成された伝送線路１８ｃの信号線との接続を行うと共に，電子回路１５のアースと電子回路１８とのアースの接続が行われる。
【００１７】
１８は第２の電子回路収納室６に収納された電子回路を示し，必要に応じて要求される高周波特性に応じた電子回路が配設してある。この実施例では，電子回路の例であるプリント基板は突出部１８ａと本体部１８ｂとからなり，突出部１８ａは上記電子回路１５の透孔２５ａに貫通交叉する位置において半田等の接続手段で信号線及びアースの夫々が接続される。本体部１８ｂにはＣＡＴＶシステムにおける上り信号阻止用フィルター２０を備えさせている。
上記フィルター２０は，例えば，通過帯域が７０〜２６００ＭＨｚ（７０ＭＨｚ以上）であって，阻止周波数帯域を５５ＭＨｚ以下とするハイパスフィルター２０ａと，通過帯域が１０〜５５ＭＨｚであって，阻止周波数帯域７０ＭＨｚ以上とするローパスフィルター２０ｂと７５Ωの抵抗２０ｃとから構成されている。
こうして，入力端子１３と出力端子１１とは，電子回路１５に形成された伝送線路１５ｃと電子回路１８の伝送経路１８ｃとフィルター２０とを介して接続されることになる。
図４にこの実施例の結線図を示す。
【００１８】
次に第２の実施形態として図５乃至図８を参照して説明する。尚，以下の説明では，上記第１の実施形態のテレビ端子１と同様の構成要素については同一符号を付与し，詳細な説明は省略する。
この実施例は，入力端子１２，１３と出力端子１０，１１とを直接的に接続したり，或いは，それらの間に上記フィルター２０が介在する状態に接続したりする切替手段を備えさせており，この切替操作によって双方向の伝送と，単方向の伝送とを切替可能とするものである。
【００１９】
本体部１８には単方向，双方向切替回路３０が備えさせて有る。この切替回路３０には，切替手段としてのスライドスイッチ３０ａとフィルター２０とから構成されており，例えばスイッチ３０ａを一方の側に切替えれば，入力端子１３と出力端子１１とを直接的に接続し，例えば１０〜２６００ＭＨｚ（１０ＭＨｚ以上）を通過させる。スイッチ３０ａを他方の側に切替えれば，入力端子１３と出力端子１１との間に，例えばＣＡＴＶシステムにおける上り信号阻止用フィルター２０が介在する状態に接続し，７０〜２６００ＭＨｚ（７０ＭＨｚ以上）を通過させる。
このスイッチ３０ａは，当該スイッチ３０ａの操作部を上記筐体の前側面方向になるように取付けられている。更には，筐体の前側面には，上記操作部に相対抗する位置に操作窓２３が形成されており，筐体の前側面から上記スイッチの操作ができる。
尚，操作窓２３からスイッチの操作部が突出する形で構成された場合のご操作が心配であれば，外部からの操作を可能にする範囲で上記操作部を凹ましても良い。さらには，表面に開閉蓋を付設しても良い。
【００２０】
第１の電子回路収納室３には電子回路１６，１７が収納されている。電子回路１６には，上述の例と同様に必要に応じて要求される高周波特性に応じた電子回路が配設してある。この実施例では，入力端子１２と接続する伝送経路１６ａが形成されており，当該伝送線路１６ａの出力端と出力端子（例えば出力端子１０）の中心導体１０ｂとは導線１４でもって接続されている。
さらに，入力端子１３から電子回路１８に向けて信号を送る為の伝送線路１７ａを形成した電子回路１７が配設してある。この電子回路１７と，第２の電子回路収納室６に収納された電子回路１８とは，例えば同軸ケーブル２２でもって接続されている。これによって，伝送線路１６ａと伝送線路１７ａとの距離が広くなると共に，同軸ケーブル２２の外皮導体とでもって，伝送線間のアイソレーションがより良好な特性が得られる。
【００２１】
１８は第２の電子回路収納室６に収納された電子回路を示し，必要に応じて要求される高周波特性に応じた電子回路が配設してある。この電子回路１８には上述の如く，入力端子と出力端子とを直接的に接続したり，或いは，それらの間に上記フィルターが介在する状態に接続したりする単方向，双方向切替回路３０を備えさせて，この切替操作によって双方向の伝送と，単方向の伝送とを切替可能とするのも良いし，ＣＡＴＶシステムにおける上り信号阻止用フィルター２０を備えさせても良い。このようにして，入力端子１３と出力端子１１とは電子回路１７の伝送経路１７ａ，同時ケーブル２２，電子回路１８を介して接続されている。図８にこの実施例の結線図を示す。
以上のように，２入力２出力端子のテレビ端子の，２系統の伝送経路の内，一方の伝送経路には，上り信号阻止用フィルター２０を備えさせるか，単方向，双方向切替回路３０を備えさせるかすることで，当該テレビ端子を用いることでＣＡＴＶシステムにおける上り流合雑音に対応できるのである。
尚，本発明は上記実施の形態に限定されるものではなく，本発明の趣旨を逸脱しない範囲で各部を適宜に変更して実施することも可能である．
【００２２】
【発明の効果】
以上詳述したように，請求項１に記載のテレビ端子には，筐体の前側面に相互に離間させて配置された２つの出力端子と，筐体の後側にあって出力端子の配置方向と直交する方向に相互に離間させて配置された２つの入力端子とが備えられている。
そして，筐体には，シールド構造の空間として，２つの出力端子の一方と２つの入力端子とが配置される第１の電子回路収納室と，２つの出力端子の他方が配置される第２の電子回路収納室と，が形成されている。
また，第１の電子回路収納室には，当該第１の電子回路収納室に配置された出力端子と一方の入力端子とを接続するための第１の接続経路と，当該第１の電子回路収納室に配置された他方の入力端子を前記第２の電子回路収納室に配置された出力端子に接続するための第２の接続経路と，からなる第１の電子回路が収納されている。
また，第２の電子回路収納室には，当該第２の電子回路収納室に配置された出力端子を第１の電子回路収納室に配置された他方の入力端子に接続するための第３の接続経路と，この第３の接続経路で出力端子から入力端子側へと流れる，ＣＡＴＶシステムにおける上り信号を阻止する上り信号阻止用フィルターと，からなる第２の電子回路が収納されている。
そして，第１の電子回路収納室と第２の電子回路収納室との間には，第２の接続経路と第３の接続経路とを接続する経路を通すための透孔が形成されている。
このため，本発明のテレビ端子によれば，２つの入力端子と２つの出力端子とをそれぞれ接続する２系統の接続経路の配線を，省スペースで行うことができる。また２つの接続経路の一方には，上り信号阻止用フィルターを備えるように構成したので，ＣＡＴＶシステムに接続すれば，流合雑音の対策がなされることになり，汎用性の高いテレビ端子が提供できる。
【００２３】
なお，上り信号阻止フィルターは，請求項２に記載のように，第３の接続経路上に設けられたハイパスフィルターと，第３の接続経路とグランドとの間に設けられたローパスフィルターと，ローパスフィルターに対し直列に接続された抵抗とから構成するとよい。
また，請求項３に記載のテレビ端子においては，第３の接続経路に，ＣＡＴＶシステムにおける双方向信号用回線と，前記上り信号用阻止フィルターを備えた下り信号用回線と，前記双方向信号用回線と下り信号用回線とを切替える切替手段と，が設けられているので，ＣＡＴＶセンター装置側とのデータの送受を行うケーブルモデム等の情報端末を接続する場合や接続しない場合の何れの状態にも対応できるテレビ端子が提供できる。
また，請求項４に記載のテレビ端子においては，切替手段における操作部を，筐体の前側側から操作できるようにしたので，テレビ端子の取付後，切替手段を操作できることになり，利便性の高いテレビ端子が提供できる。
【図面の簡単な説明】
【図１】（Ａ）は正面図，（Ｂ）Ａ−Ａ位置断面図。
【図２】図１（Ｂ）のＢ−Ｂ位置断面図であって，テレビ端子における電子回路収納室６の裏蓋を除いた状態を示す図。
【図３】上方向から見た電子回路収納室３の上蓋を除いた状態を示す図。
【図４】（Ａ）は結線図，（Ｂ）はフィルター２０の回路ブロック図である。
【図５】他の実施例であり，（Ａ）は正面図，（Ｂ）Ｃ−Ｃ位置断面図。
【図６】図５（Ｂ）のＤ−Ｄ位置断面図であって，テレビ端子における電子回路収納室６の裏蓋を除いた状態を示す図。
【図７】図５の実施例において，上方向から見た電子回路収納室３の上蓋を除いた状態を示す図。
【図８】図５の実施例の（Ａ）は結線図，（Ｂ）はフィルター３０の回路ブロック図である。
【符号の説明】
１…テレビ端子，２…筐体，２ａ…基体，３…第１の電子回路収納室，３ａ…開口部，３ｂ…底壁，４…空間，５…上蓋，６…第２の電子回路収納室，６ａ…開口部，７…空間，８…後蓋，９…段部，１０，１１…出力端子，１０ａ，１１ａ…外部導体，１０ｂ，１１ｂ…中心導体，１２，１３…入力端子，１２ａ，１３ａ…外部導体，１２ｂ，１３ｂ…中心導体，１４…導線，１５，１６，１７…電子回路，１５ａ，１６ａ，１７ａ…伝送経路，１８…電子回路，１８ａ…突出部，１８ｂ…本体部，１８ｃ…伝送線路，２０…上り信号阻止用フィルター，２０ａ…ハイパスフィルター，２０ｂ…ローパスフィルター，２０ｃ…抵抗，２２…同軸ケーブル，２３…操作窓，２５…連結部，２５ａ…透孔，３０…単方向，双方向切替回路，３０ａ…切替手段，１００…アウトレットボックス。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a television terminal mainly used in a joint reception facility of a television, and more particularly to a television terminal for box attachment used by being attached to an outlet box provided in an embedded shape on the wall surface of the house.
[0002]
[Prior art]
In recent years, not only the conventional VHF / UHF terrestrial and CS broadcasts, but also high-quality and high-quality broadcasts newly sent from BS 110 ° CS digital broadcasts and terrestrial digital broadcasts, etc. The number of channels is increasing. In such a background, in order to enjoy the features of digital broadcasting to the maximum, a method of directly receiving the above-mentioned digital broadcasting wave is preferable. However, when trying to receive all the broadcasting from such multiple satellites, the transmission frequency band of the CS-IF band of 110 ° CS digital broadcasting and the conventional CS broadcasting overlaps, so at least two systems of coaxial lines are required. Become. In this case, there are two ways to install a TV terminal in the house: an outlet box with two TV terminals attached to make the TV terminal two terminals, or a TV terminal for 2-input, 2-output coaxial dual system wiring. It was.
On the other hand, because of the widespread use of urban CATV and the beauty of homes, the number of cases where conventional broadcasting uses CATV has increased. Furthermore, subscribing to CATV has the advantage of enabling broadband Internet connections, and in this respect as well, the number of subscribing to CATV has increased.
In such a case, the lead-in wire to the home is a two-wire wiring of a coaxial cable from the satellite antenna and a coaxial cable from the CATV line, and two television terminals are required in the house.
In the example of the two systems of the coaxial cable as described above, a television terminal outlet box is attached with a type that has two television terminals, or two outlet boxes are installed (see, for example, Patent Literature) and a television is installed. There was a method of using two terminals.
[0003]
[Patent Literature]
Japanese Patent Laid-Open No. 2002-25722
[Problems to be solved by the invention]
However, the conventional method of installing two outlet boxes and installing two TV terminals requires a large wall mounting space, which requires a lot of installation work, and the construction cost increases accordingly. There was a problem I said.
In the example shown in the publication, two small television terminals can be attached to provide two terminals in a space-saving manner. For example, if one of the two terminals is connected to the CATV as in the above example, Then, a measure for blocking the upstream signal is required so that inflow noise does not flow from the terminal to the center device side of the CATV.
However, in order to perform two coaxial wirings in a limited space in the outlet box, the size of each television terminal is limited, and as described above, at least one terminal side is incompatible with ingress noise. When countermeasures against upstream signals are taken, the TV terminal becomes larger in the depth direction, and the conventional example has a problem that the coaxial cable cannot be wired to one side.
Therefore, the present invention has been made to solve the above-mentioned problems of the prior art,
The purpose is to provide a two-terminal television terminal suitable for two coaxial lines.
Another object is to provide a television terminal in which an input terminal and an output terminal are formed integrally with a case body, which is suitable for two coaxial lines.
Another object is to provide a television terminal suitable for two coaxial lines that transmits a transmission frequency band that easily interferes with each other.
Another object of the present invention is to provide a television terminal having an upstream signal blocking countermeasure means at least on one of the two-terminal television terminals for coaxial dual system wiring.
Another object of the present invention is to provide a two-terminal TV terminal for coaxial dual system wiring, and at least one of the terminals is provided with an upstream signal blocking countermeasure means, and the upstream signal blocking countermeasure means can be turned on and off using a switching means. Another object of the present invention is to provide a television terminal characterized by the above.
Another object of the present invention is to provide a two-terminal type television terminal for coaxial dual-system wiring, wherein at least one terminal is provided with an upstream signal blocking countermeasure means that can be turned on and off by using a switching means, and an operating portion of the switching means. Is to provide a TV terminal that can be operated from the front side of the case body.
[0005]
[Means for Solving the Problems]
The invention according to claim 1 made to solve the above-mentioned problems is as follows:
A housing having a space formed in a shield structure for housing an electronic circuit;
Two output terminals that are spaced apart from each other on the front side of the housing;
In a television terminal provided with two input terminals arranged on the rear side of the housing and spaced apart from each other in a direction orthogonal to the arrangement direction of the output terminals,
In the housing, as the space, a first electronic circuit storage chamber in which one of the two output terminals and the two input terminals are disposed, and a second in which the other of the two output terminals is disposed. And an electronic circuit storage chamber of
The first electronic circuit storage chamber has a first connection path for connecting an output terminal disposed in the first electronic circuit storage chamber and one input terminal, and the first electronic circuit storage chamber. A first electronic circuit comprising: a second connection path for connecting the other input terminal disposed in the chamber to an output terminal disposed in the second electronic circuit housing chamber;
The second electronic circuit storage chamber includes a third terminal for connecting an output terminal disposed in the second electronic circuit storage chamber to the other input terminal disposed in the first electronic circuit storage chamber. A second electronic circuit comprising a connection path and an upstream signal blocking filter for blocking an upstream signal in the CATV system that flows from the output terminal to the input terminal side through the third connection path is housed. ,
In addition, a through hole is provided between the first electronic circuit storage chamber and the second electronic circuit storage chamber for passing a path connecting the second connection path and the third connection path. It is formed.
[0006]
The invention of claim 2 is the television terminal of claim 1,
The upstream signal blocking filter for blocking upstream signals in a CATV system is:
A high-pass filter that is provided on the third connection path, blocks the passage of the upstream signal, and passes the downstream signal flowing from the input terminal to the output terminal;
A low-pass filter that is provided between the third connection path and the ground, blocks the passage of the downstream signal, and passes the upstream signal;
A resistor connected in series with the low-pass filter;
It is comprised from these.
[0007]
Next, the invention of claim 3, the television terminal according to claim 1 or claim 2, wherein the third connection path, and the line for two-way signals in CATV system, blocking the uplink signal characterized in that the downlink signal channel having a filter, and switching means for switching between the two-way signal link and forward signal line is provided.
[0008]
The invention according to claim 4, the television terminal according to claim 3, the operation unit in the switching means, characterized in that from the front side of the housing are to be freely capable expose the operation .
[0009]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below in detail with reference to the drawings.
FIG. 1A is a front view, and FIG. FIG. 2 is a cross-sectional view taken along the line BB in FIG. FIG. 3 is a diagram illustrating a state in which the upper cover of the electronic circuit storage chamber 3 is removed as viewed from above. 4A is a connection diagram, and FIG. 4B is a circuit block diagram of the filter 20.
FIG. 5 is another embodiment, (A) is a front view, and (B) CC sectional view. FIG. 6 is a cross-sectional view taken along the line DD in FIG. 5B and shows a state in which the back cover of the electronic circuit storage chamber 6 is removed from the television terminal. 7 is a view showing a state in which the upper cover of the electronic circuit storage chamber 3 is removed from the embodiment of FIG. 8A is a connection diagram, and FIG. 8B is a circuit block diagram of the unidirectional / bidirectional switching circuit 30.
[0010]
First, the embodiment shown in FIGS. 1 to 4 will be described. Reference numeral 100 denotes a known outlet box, and reference numeral 1 denotes an embedded type or exposed type television terminal stored in the outlet box 100.
The television terminal 1 has a housing 2, and the housing 2 is formed with a shield structure space for housing an electronic circuit. This space includes a first electronic circuit storage chamber 3 having a long space in the rear direction, and a second electronic circuit storage chamber 6 having a long space in the direction parallel to the front side surface. Further, in this embodiment, two output terminals 10 and 11 are provided on the front side surface of the housing 2 and two input terminals 12 and 13 are provided on the rear side of the space.
[0011]
In the housing 2, reference numeral 2a denotes a base body, which is integrally plastically formed by a generally known die casting method, and the output terminals 10 and 11 are attached to the front side surface of the base body 2a. The electronic circuit storage chambers 3, 6 and the input terminals 12, 13 are laid on the rear side of the base 2a.
[0012]
Next, the case 2 will be described in more detail. The first electronic circuit storage chamber 3 provided on the upper side of the rear side of the housing 2 is formed in a box shape having an opening in the upper direction by using an aluminum material that is integral with the base 2a. The upper lid 5 made of a conductive material that is detachably attached to the opening 3 a of the first electronic circuit storage chamber 3 has a shield structure, and a space is formed inside the first electronic circuit storage 3. 4 is formed.
Next, the second electronic circuit storage chamber 6 provided on the rear side of the base body 2a is sized so as to surround the back side of the housing 2 and uses an aluminum material that is integral with the base body 2a. The rear side of the housing 2 is formed in a box shape, and is formed of a conductive material that is detachably attached to the opening 6a of the second electronic circuit storage chamber 6. The lid 8 forms a shield structure, and a space 7 is formed inside the second electronic circuit storage chamber 6.
On the inner surfaces of these electronic circuit storage chambers 3 and 6, a well-known substrate supporting step 9 for fixing a substrate which is an electronic circuit described later is formed as an integral material with the base 2 a as necessary.
[0013]
The output terminals 10 and 11 are arranged on the front side surface of the housing 2 so as to be separated from each other in the vertical direction. The output terminals 10 and 11 are made of, for example, an aluminum material that is an integral material with the housing 2, and hollow outer conductors 10 a and 11 a that are formed so as to project in the front side surface direction, and hollow outer conductors that are inserted into these outer conductors. It is comprised from the insulator and the center conductors 10b and 11b arrange | positioned in the center part of this insulator. These output terminals 10 and 11 are usually called plugs or connectors, and are not limited to the embodiments, and plugs formed separately may be used.
[0014]
The input terminals 12 and 13 are located at the rear side of the housing 2, more specifically, the rear side of the second electronic circuit storage chamber 6, and the input terminals 12 and 13 are connected to the base 2a. Hollow outer conductors 12a and 13a integrally projecting downward from the bottom wall 3b, a hollow insulator inserted into these outer conductors, and a central conductor disposed at the center of the insulator 12b and 13b.
The input terminals 12 and 13 are arranged so as to be greatly separated from each other in the left-right direction, and are arranged at positions where the space on the rear side of the second electric circuit storage chamber 6 is enlarged. 13 is formed so that there is no hindrance to the cable connection work normally performed on 13.
The input terminals 12 and 13 are usually called plugs or connectors, and it is needless to say that plugs formed separately may be used without being limited to the embodiment.
[0015]
In this embodiment, one input terminal 12 has an electronic circuit 15 housed in the first electronic circuit housing chamber 3 and an output of the electronic circuit 15 with respect to the output terminal 10 located above the housing 2. The terminal 10 is connected via a conductor 14 that connects the central conductor 10b.
The other input terminal 13 is connected to the electronic circuit 15 accommodated in the first electronic circuit accommodating chamber 3 and the second electric circuit accommodating chamber 6 with respect to the output terminal 11 located below the housing 2. The electronic circuit 18 is connected via a housed electronic circuit 18.
The combination of connection between the input terminals 12 and 13 and the output terminals 10 and 11 in the embodiment of the present invention is an example, and the present invention is not limited to this embodiment.
[0016]
Reference numeral 15 denotes an electronic circuit stored in the first electronic circuit storage chamber 3, and an electronic circuit corresponding to the high-frequency characteristics required as necessary is disposed. In this embodiment of the electronic circuit 15, the input terminal 12 and the output terminal 10 include a transmission path 15 a formed in the electronic circuit 15 and a conductive wire 14 connecting the transmission path 15 a and the central conductor 10 b of the output terminal 10. It is formed so that it may be connected via. In addition, a transmission line 15 b for sending a signal from the input terminal 13 toward the electronic circuit 18 is formed in the electronic circuit 15.
The electronic circuit 15 includes a connecting portion 25 having a through hole 25a for connecting with a protruding portion 18a of a printed circuit board, which will be described later. In the connecting portion 25, an output of a transmission line 15b formed in the electronic circuit 15 is provided. The end and the signal line of the transmission line 18 c formed in the electronic circuit 18 are connected, and the ground of the electronic circuit 15 and the ground of the electronic circuit 18 are connected.
[0017]
Reference numeral 18 denotes an electronic circuit housed in the second electronic circuit housing chamber 6, and an electronic circuit corresponding to the high-frequency characteristics required as necessary is disposed. In this embodiment, a printed circuit board, which is an example of an electronic circuit, includes a protruding portion 18a and a main body portion 18b. The protruding portion 18a is connected to a signal passing through a through hole 25a of the electronic circuit 15 by connecting means such as solder. Each of the wire and ground is connected. The main body 18b is provided with an upstream signal blocking filter 20 in the CATV system.
The filter 20 has, for example, a high-pass filter 20a having a pass band of 70 to 2600 MHz (70 MHz or more) and a stop frequency band of 55 MHz or less, a pass band of 10 to 55 MHz, and a stop frequency band of 70 MHz or more. And a 75Ω resistor 20c.
Thus, the input terminal 13 and the output terminal 11 are connected via the transmission line 15 c formed in the electronic circuit 15, the transmission path 18 c of the electronic circuit 18, and the filter 20.
FIG. 4 shows a connection diagram of this embodiment.
[0018]
Next, a second embodiment will be described with reference to FIGS. In the following description, components similar to those of the television terminal 1 of the first embodiment are given the same reference numerals, and detailed description thereof is omitted.
In this embodiment, there are provided switching means for directly connecting the input terminals 12 and 13 and the output terminals 10 and 11 or connecting them in a state where the filter 20 is interposed therebetween. This switching operation enables switching between bidirectional transmission and unidirectional transmission.
[0019]
The main body 18 is provided with a unidirectional and bidirectional switching circuit 30. The switching circuit 30 includes a slide switch 30a as a switching means and a filter 20. For example, when the switch 30a is switched to one side, the input terminal 13 and the output terminal 11 are directly connected. , For example, 10 to 2600 MHz (10 MHz or more) is passed. If the switch 30a is switched to the other side, for example, an upstream signal blocking filter 20 in the CATV system is connected between the input terminal 13 and the output terminal 11, and passes through 70 to 2600 MHz (70 MHz or more). Let
The switch 30a is attached so that the operation portion of the switch 30a is in the direction of the front side surface of the casing. Furthermore, an operation window 23 is formed on the front side surface of the housing at a position opposed to the operation portion, and the switch can be operated from the front side surface of the housing.
If the operation portion of the switch is configured to protrude from the operation window 23, the operation portion may be recessed in a range that allows external operation. Furthermore, an open / close lid may be provided on the surface.
[0020]
Electronic circuits 16 and 17 are stored in the first electronic circuit storage chamber 3. Similar to the above-described example, the electronic circuit 16 is provided with an electronic circuit corresponding to the required high frequency characteristics. In this embodiment, a transmission path 16a connected to the input terminal 12 is formed, and the output end of the transmission line 16a and the center conductor 10b of the output terminal (for example, the output terminal 10) are connected by a conductive wire 14. .
Further, an electronic circuit 17 is provided in which a transmission line 17a for sending a signal from the input terminal 13 toward the electronic circuit 18 is formed. The electronic circuit 17 and the electronic circuit 18 housed in the second electronic circuit housing chamber 6 are connected by, for example, a coaxial cable 22. As a result, the distance between the transmission line 16a and the transmission line 17a is increased, and the outer conductor of the coaxial cable 22 provides a better isolation characteristic between the transmission lines.
[0021]
Reference numeral 18 denotes an electronic circuit housed in the second electronic circuit housing chamber 6, and an electronic circuit corresponding to the high-frequency characteristics required as necessary is disposed. As described above, the electronic circuit 18 includes a unidirectional and bidirectional switching circuit 30 that directly connects the input terminal and the output terminal, or connects the input terminal and the output terminal so that the filter is interposed therebetween. In addition, it is possible to switch between bidirectional transmission and unidirectional transmission by this switching operation, or an upstream signal blocking filter 20 in the CATV system may be provided. In this way, the input terminal 13 and the output terminal 11 are connected via the transmission path 17 a of the electronic circuit 17, the simultaneous cable 22, and the electronic circuit 18. FIG. 8 shows a connection diagram of this embodiment.
As described above, one of the two transmission paths of the two-input / two-output terminal TV terminal is provided with the upstream signal blocking filter 20 or the unidirectional / bidirectional switching circuit 30 is provided. In other words, by using the television terminal, it is possible to cope with upstream inflow noise in the CATV system.
Note that the present invention is not limited to the above-described embodiment, and can be implemented by appropriately changing each part without departing from the gist of the present invention.
[0022]
【The invention's effect】
As described above in detail, the television terminal according to claim 1 has two output terminals arranged on the front side surface of the casing so as to be separated from each other, and an arrangement of the output terminals on the rear side of the casing. There are provided two input terminals that are spaced apart from each other in a direction orthogonal to the direction.
The casing has a first electronic circuit storage chamber in which one of the two output terminals and two input terminals are arranged, and a second in which the other of the two output terminals is arranged as a shield structure space. And an electronic circuit storage chamber.
The first electronic circuit storage chamber includes a first connection path for connecting an output terminal disposed in the first electronic circuit storage chamber and one input terminal, and the first electronic circuit. A first electronic circuit comprising a second connection path for connecting the other input terminal arranged in the accommodation chamber to an output terminal arranged in the second electronic circuit accommodation chamber is accommodated.
Further, the second electronic circuit storage chamber has a third terminal for connecting the output terminal disposed in the second electronic circuit storage chamber to the other input terminal disposed in the first electronic circuit storage chamber. A second electronic circuit comprising a connection path and an upstream signal blocking filter for blocking upstream signals in the CATV system flowing from the output terminal to the input terminal side in the third connection path is housed.
A through hole is formed between the first electronic circuit storage chamber and the second electronic circuit storage chamber for passing the path connecting the second connection path and the third connection path. .
For this reason, according to the television terminal of the present invention, it is possible to perform wiring of two connection paths for connecting the two input terminals and the two output terminals, respectively, in a space-saving manner. Since one of the two connection paths is equipped with an upstream signal blocking filter, if it is connected to a CATV system, measures against inflow noise will be taken, and a highly versatile TV terminal will be provided it can.
[0023]
The upstream signal blocking filter includes a high-pass filter provided on the third connection path, a low-pass filter provided between the third connection path and the ground, and a low-pass filter. It is good to comprise from the resistance connected in series with respect to the filter.
In the television terminal according to claim 3, a bidirectional signal line in the CATV system, a downstream signal line provided with the upstream signal blocking filter, and the bidirectional signal line in the third connection path. since switching means for switching between link and forward signal line is provided, in either state when not or connection when connecting the information terminals such as cable modem for transmitting and receiving data between the CATV center equipment side Can provide a TV terminal.
Further, in the television terminal according to claim 4, since the operation portion of the switching means can be operated from the front side of the housing, the switching means can be operated after the television terminal is attached, which is convenient. High TV terminal can be provided.
[Brief description of the drawings]
1A is a front view, and FIG. 1B is a cross-sectional view taken along line AA.
2 is a cross-sectional view taken along the line BB in FIG. 1B, showing a state in which a back cover of the electronic circuit housing chamber 6 is removed from the television terminal.
FIG. 3 is a diagram illustrating a state in which an upper cover of the electronic circuit storage chamber 3 is removed as viewed from above.
4A is a connection diagram, and FIG. 4B is a circuit block diagram of a filter 20;
FIG. 5 is another embodiment, (A) is a front view, and (B) CC sectional view.
6 is a cross-sectional view taken along the DD line in FIG. 5B, showing a state in which the back cover of the electronic circuit housing chamber 6 is removed from the television terminal.
7 is a view showing a state in which the upper lid of the electronic circuit storage chamber 3 is removed from the embodiment shown in FIG.
8A is a connection diagram, and FIG. 8B is a circuit block diagram of a filter 30 in the embodiment of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Television terminal, 2 ... Housing | casing, 2a ... Base | substrate, 3 ... 1st electronic circuit storage chamber, 3a ... Opening part, 3b ... Bottom wall, 4 ... Space, 5 ... Top cover, 6 ... 2nd electronic circuit storage Chamber, 6a ... Opening, 7 ... Space, 8 ... Rear lid, 9 ... Step part, 10, 11 ... Output terminal, 10a, 11a ... External conductor, 10b, 11b ... Center conductor, 12, 13 ... Input terminal, 12a , 13a ... external conductor, 12b, 13b ... central conductor, 14 ... conductor, 15, 16, 17 ... electronic circuit, 15a, 16a, 17a ... transmission path, 18 ... electronic circuit, 18a ... projecting part, 18b ... main body part, 18c ... Transmission line, 20 ... Upstream signal blocking filter, 20a ... High pass filter, 20b ... Low pass filter, 20c ... Resistance, 22 ... Coaxial cable, 23 ... Operation window, 25 ... Connection, 25a ... Through hole, 30 ... Single Direction, bidirectional switching circuit, 30 ... switching means, 100 ... outlet box.

Claims

A housing having a space formed in a shield structure for housing an electronic circuit;
Two output terminals that are spaced apart from each other on the front side of the housing;
In a television terminal provided with two input terminals arranged on the rear side of the housing and spaced apart from each other in a direction orthogonal to the arrangement direction of the output terminals,
In the housing, as the space, a first electronic circuit storage chamber in which one of the two output terminals and the two input terminals are disposed, and a second in which the other of the two output terminals is disposed. And an electronic circuit storage chamber of
The first electronic circuit storage chamber has a first connection path for connecting an output terminal disposed in the first electronic circuit storage chamber and one input terminal, and the first electronic circuit storage chamber. A first electronic circuit comprising: a second connection path for connecting the other input terminal disposed in the chamber to an output terminal disposed in the second electronic circuit housing chamber;
The second electronic circuit storage chamber includes a third terminal for connecting an output terminal disposed in the second electronic circuit storage chamber to the other input terminal disposed in the first electronic circuit storage chamber. A second electronic circuit comprising a connection path and an upstream signal blocking filter for blocking an upstream signal in the CATV system that flows from the output terminal to the input terminal side through the third connection path is housed. ,
In addition, a through hole is provided between the first electronic circuit storage chamber and the second electronic circuit storage chamber for passing a path connecting the second connection path and the third connection path. A television terminal characterized by being formed.

The upstream signal blocking filter for blocking upstream signals in a CATV system is:
A high-pass filter that is provided on the third connection path, prevents passage of the upstream signal, and passes a downstream signal flowing from the input terminal to the output terminal;
A low-pass filter that is provided between the third connection path and the ground, blocks the passage of the downstream signal, and passes the upstream signal;
A resistor connected in series with the low-pass filter;
The television terminal according to claim 1, comprising:

The third connection path includes switching means for switching between a bidirectional signal line in the CATV system, a downstream signal line provided with the upstream signal blocking filter, and the bidirectional signal line and downstream signal line. The TV terminal according to claim 1, wherein the TV terminal is provided.

The television terminal according to claim 3, wherein the operation unit in the switching means is configured to be exposed from the front side of the housing.