JPH09148143A - Passive equipment - Google Patents

Passive equipment

Info

Publication number
JPH09148143A
JPH09148143A JP7302381A JP30238195A JPH09148143A JP H09148143 A JPH09148143 A JP H09148143A JP 7302381 A JP7302381 A JP 7302381A JP 30238195 A JP30238195 A JP 30238195A JP H09148143 A JPH09148143 A JP H09148143A
Authority
JP
Japan
Prior art keywords
choke coil
pwb
trap
width
opening
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.)
Granted
Application number
JP7302381A
Other languages
Japanese (ja)
Other versions
JP3592814B2 (en
Inventor
Yuji Ito
祐次 伊藤
Houei Shinoda
朋英 信田
Isato Osako
勇人 大迫
Kazuhiro Masuzawa
一浩 増澤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hochiki Corp
Original Assignee
Hochiki Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hochiki Corp filed Critical Hochiki Corp
Priority to JP30238195A priority Critical patent/JP3592814B2/en
Publication of JPH09148143A publication Critical patent/JPH09148143A/en
Application granted granted Critical
Publication of JP3592814B2 publication Critical patent/JP3592814B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/0213—Electrical arrangements not otherwise provided for
    • H05K1/0216—Reduction of cross-talk, noise or electromagnetic interference
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/0213—Electrical arrangements not otherwise provided for
    • H05K1/0216—Reduction of cross-talk, noise or electromagnetic interference
    • H05K1/023—Reduction of cross-talk, noise or electromagnetic interference using auxiliary mounted passive components or auxiliary substances
    • H05K1/0233—Filters, inductors or a magnetic substance
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/18—Printed circuits structurally associated with non-printed electric components

Landscapes

  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Coils Or Transformers For Communication (AREA)

Abstract

PROBLEM TO BE SOLVED: To realize a passive equipment such as branching unit, distributor, etc., capable of averting the effect of a trap neither incurring the decline in workability nor cost up. SOLUTION: A printed-wiring board(PWB) is provided with an aperture part EA in width at least exceeding the width of a choke coil 1 and length exceeding that of the choke coil 1 on the position opposing to the fitting position of the choke coil 1 furthermore, laying down ground patterns around this aperture part so that the dielectric constant of air may be interposed in the gap between the PWB and the choke coil 1 to reduce the floating capacity component. Through these procedures, the possible decline in the workability or cost up in the conventional passive equipments interposing an insulating spacer between the choke coil and the PWB may not be incurred thereby enabling the effect of a trap to be averted.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【発明の属する技術分野】本発明は、例えば、衛星放送
を共同受信するシステムや、ＣＡＴＶシステムに用いて
好適な分岐器、分配器等の受動機器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a passive device such as a system for jointly receiving satellite broadcasting or a branching device or a distributor suitable for use in a CATV system.

【０００２】[0002]

【従来の技術】従来より、受動機器として、高周波入力
信号を等分配して出力したり、高周波入力信号の一部を
抽出して１つまたは複数の分岐端子へ出力する一方、そ
の残りの入力信号を出力端子に出力する分岐器や分配器
が知られている。このような分岐器や分配器は、集合住
宅において衛星放送を共同受信するシステムや、ＣＡＴ
Ｖシステムのタップオフ等に用いられている。2. Description of the Related Art Conventionally, as a passive device, a high frequency input signal is equally distributed and output, or a part of the high frequency input signal is extracted and output to one or a plurality of branch terminals, while the remaining input is used. 2. Description of the Related Art A branching device or a distributor that outputs a signal to an output terminal is known. Such a branching device or a distributor is a system for jointly receiving satellite broadcasting in a housing complex or a CAT.
It is used for tap-off of V system.

【０００３】さて、分岐器、分配器では、高周波信号を
分岐・分配する機能以外にも電流通過機能を持たせる場
合が多い。その一例としては、分岐器、分配器の出力端
側から入力端側へＢＳコンバータ用の駆動電流を供給す
るものが挙げられる。図３は、こうした電流通過機能を
備える受動機器である分岐器の一構成例を示す回路図で
ある。この図に示す分岐器は、入力端ＩＮに供給される
高周波入力信号を分岐端ＢＲへ分岐出力すると共に、出
力端ＯＵＴへ出力する１分岐器である。In many cases, the branching device and the distributing device have a current passing function in addition to the function of branching and distributing the high frequency signal. An example thereof is one that supplies a drive current for a BS converter from the output end side of a branching device or a distributor to the input end side. FIG. 3 is a circuit diagram showing a configuration example of a branching device which is a passive device having such a current passing function. The branching device shown in this figure is a one-branching device that branches a high-frequency input signal supplied to the input end IN to the branching end BR and outputs it to the output end OUT.

【０００４】この１分岐器は、直流信号をカットして高
周波信号を通過させるバイパスコンデンサＣ１〜Ｃ３
と、トランス結合により分岐出力を発生する分岐トラン
スＴＲと、このトランスＴＲの出力側に設けられ、分岐
出力インピーダンスを整合させる抵抗Ｒと、上述した電
流通過機能を具現するチョークコイルＣＨ１，ＣＨ２お
よびコンデンサＣTとから構成されている。上記構成に
よる１分岐器では、チョークコイルＣＨ１，ＣＨ２のイ
ンダクタンスＬと、基板／コイル間の浮遊容量Ｃとによ
り発生するトラップ（ＬＣ共振回路）が入力端ＩＮと出
力端ＯＵＴとの間の挿入損失特性を劣化させる。その
為、チョークコイルＣＨ１，ＣＨ２に対して上記コンデ
ンサＣTを容量結合させてトラップの共振点を分岐器の
使用周波数帯域よりも低域側へシフトさせ、分岐器の挿
入損失特性を実効的に改善している。This one-branching device includes bypass capacitors C1 to C3 for cutting a DC signal and passing a high frequency signal.
A branch transformer TR for generating a branch output by transformer coupling, a resistor R provided on the output side of the transformer TR for matching the branch output impedance, and choke coils CH1, CH2 and capacitors for implementing the above-mentioned current passing function. And C T. In the one-brancher having the above configuration, the trap (LC resonance circuit) generated by the inductance L of the choke coils CH1 and CH2 and the stray capacitance C between the substrate and the coil causes an insertion loss between the input end IN and the output end OUT. Deteriorate the characteristics. Therefore, the capacitor C T is capacitively coupled to the choke coils CH1 and CH2 to shift the resonance point of the trap to the lower frequency side than the operating frequency band of the branching device, thereby effectively inserting the insertion loss characteristic of the branching device. Has improved.

【０００５】ところで、チョークコイルＣＨ１，ＣＨ２
およびコンデンサＣTを用いてトラップの共振点を低域
側へシフトさせる手法では、部品点数の削減や製造工程
の簡略化といった製品コスト低減策に対応できず、ま
た、近年のＢＳ・ＣＳ放送あるいはＣＡＴＶ（ケーブル
テレビジョン）の普及に伴い、低域から高域にわたって
均一で安定した挿入損失特性が要求されているという背
景もあり、１つのチョークコイルで電流通過機能を実現
させている。By the way, the choke coils CH1 and CH2
The technique of shifting the resonance point of the trap to the lower frequency side by using the capacitor C T cannot cope with the product cost reduction measures such as the reduction of the number of parts and the simplification of the manufacturing process. With the spread of CATV (cable television), there is a background that a uniform and stable insertion loss characteristic is required from a low frequency band to a high frequency band, and one choke coil realizes a current passing function.

【０００６】１つのチョークコイルを用いて上記の要求
を満たすには、プリント基板に実装されたチョークコイ
ルと、当該基板の接地パターンとの間に発生する浮遊容
量成分を如何に低減させるかがポイントになる。その
為、従来では、図４に示すように、低誘電率の絶縁スペ
ーサ２をプリント基板ＰＷＢとチョークコイル１との間
に介在させて基板実装し、これによりコイル１と基板Ｐ
ＷＢとを所定の間隔で一定に保持する構造として浮遊容
量を低減させてトラップの影響を抑えるようにしてお
り、この技術の詳細については実開平６−３４２１２号
に開示されている。In order to meet the above requirements by using one choke coil, the point is how to reduce the stray capacitance component generated between the choke coil mounted on the printed board and the ground pattern of the board. become. Therefore, conventionally, as shown in FIG. 4, an insulating spacer 2 having a low dielectric constant is interposed between the printed board PWB and the choke coil 1 to be mounted on the board.
The structure for holding WB and the WB constant at a predetermined interval reduces stray capacitance to suppress the effect of traps. Details of this technique are disclosed in Japanese Utility Model Laid-Open No. 6-34212.

【０００７】[0007]

【発明が解決しようとする課題】ところで、上記公報に
開示される装置においては、トラップの影響を抑えるた
めに絶縁スペーサ２が必須になるので、部品点数が増加
してコストアップを招致するという問題がある。また、
部品実装に際しては、予め絶縁スペーサ２の両端部に設
けられている貫通孔にチョークコイル１のリードを通し
た状態にしておく必要があり、この為、作業性が低下し
て部品の自動実装化が難しくなるという弊害も生じる。
本発明は、このような事情に鑑みてなされたもので、作
業性の低下やコストアップを招致することなく、トラッ
プの影響を防止し得る分岐器、分配器等の受動機器を提
供することを目的としている。By the way, in the device disclosed in the above publication, the insulating spacer 2 is indispensable in order to suppress the influence of the trap, so that the number of parts increases and the cost increases. There is. Also,
When mounting the components, it is necessary to put the leads of the choke coil 1 through the through-holes provided at both ends of the insulating spacer 2 in advance, which reduces the workability and allows the automatic mounting of the components. It also has the adverse effect of making it difficult.
The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a passive device such as a branching device and a distributor that can prevent the influence of traps without lowering workability and increasing cost. Has an aim.

【０００８】[0008]

【課題を解決するための手段】上記目的を達成するた
め、本発明では、入出力端子間に電流通過用のチョーク
コイルを備える受動機器において、少なくとも、幅Ｗが
前記チョークコイルの幅以上であり、長さＬが前記チョ
ークコイルのコイル部分の長さ以上の寸法からなる開口
部を、当該チョークコイルが対向配置される基板位置に
穿設すると共に、この開口部の周囲に基板の接地パター
ンを敷設することを特徴としている。To achieve the above object, in the present invention, in a passive device having a choke coil for passing a current between input and output terminals, at least the width W is equal to or larger than the width of the choke coil. , An opening having a length L equal to or larger than the length of the coil portion of the choke coil is formed at a substrate position where the choke coil is arranged oppositely, and a ground pattern of the substrate is provided around the opening. It is characterized by being laid.

【０００９】本発明では、チョークコイルが対向配置さ
れる基板位置に、周囲を接地パターンで囲んだ開口部を
設けることによって、基板とチョークコイルとの間隙に
空気の誘電率を介在させて浮遊容量成分を少なくし、ト
ラップの影響を低減している。つまり、単に基板に開口
部を穿設するだけで浮遊容量成分を少なくしてトラップ
の影響を低減できるので、絶縁スペーサを介在させる従
来のもののように、作業性の低下やコストアップを招致
することなく、トラップの影響を低減することが可能に
なっている。According to the present invention, the stray capacitance is provided by providing an opening portion surrounded by a ground pattern at the position of the substrate on which the choke coil is opposed so that the dielectric constant of air is interposed in the gap between the substrate and the choke coil. The components are reduced and the effect of traps is reduced. In other words, it is possible to reduce the stray capacitance component and reduce the effect of traps simply by forming an opening in the substrate, so that workability is reduced and cost is increased, unlike the conventional one in which an insulating spacer is interposed. It is possible to reduce the influence of the trap.

【００１０】[0010]

【発明の実施の形態】本発明による分岐器、分配器等の
受動機器は、衛星放送を共同受信するシステムあるいは
ＣＡＴＶシステムの設備機器などに適用され得る。以下
では、本発明の実施の形態である分岐器を実施例として
図面を参照して説明する。なお、本実施例は前述した従
来例と同様に１つのチョークコイル１を用いて電流通過
機能を具現するものであるから、その回路構成について
は説明を省略する。この実施例が従来例と異なる点は、
チョークコイル１が装着される基板形態にあり、それに
ついて図１を参照して説明する。BEST MODE FOR CARRYING OUT THE INVENTION Passive devices such as a branching device and a distributing device according to the present invention can be applied to equipment for a system for jointly receiving satellite broadcasting or CATV system. Hereinafter, a branching device according to an embodiment of the present invention will be described as an example with reference to the drawings. Since the present embodiment embodies the current passing function by using one choke coil 1 as in the conventional example described above, the description of the circuit configuration will be omitted. The difference between this embodiment and the conventional example is that
The choke coil 1 is mounted on a substrate, which will be described with reference to FIG.

【００１１】まず、図１は分岐器におけるチョークコイ
ル１の実装形態を説明する為の図であり、同図（イ）は
プリント基板ＰＷＢを実装面から見た正面図、同図
（ロ）は断面図、同図（ハ）はプリント基板ＰＷＢをパ
ターン面から見た背面図である。これら図１（イ）〜
（ハ）において、２ａ，２ｂはプリント基板ＰＷＢの回
路パターンＣＰに穿設されたリード挿入用の孔である。
この孔２ａ，２ｂを介してチョークコイル１のリードが
プリント基板ＰＷＢの裏面の回路パターンＣＰにハンダ
固定される。ＥＡは、孔２ａ，２ｂを介して実装された
チョークコイル１に対向配置される開口部であり、幅Ｗ
×長さＬで基板ＰＷＢを切り欠いたものである。First, FIG. 1 is a diagram for explaining a mounting mode of a choke coil 1 in a branching device. FIG. 1A is a front view of a printed circuit board PWB viewed from the mounting surface, and FIG. A cross-sectional view and FIG. 3C are rear views of the printed circuit board PWB viewed from the pattern surface. These Figure 1 (a) ~
In (c), 2a and 2b are holes for lead insertion formed in the circuit pattern CP of the printed board PWB.
The leads of the choke coil 1 are soldered to the circuit pattern CP on the back surface of the printed circuit board PWB through the holes 2a and 2b. EA is an opening that is arranged to face the choke coil 1 mounted through the holes 2a and 2b, and has a width W.
B. The substrate PWB is cut out with a length L.

【００１２】開口部ＥＡの寸法は、少なくとも幅Ｗがチ
ョークコイル１の幅以上であって、長さＬが当該チョー
クコイル１に巻かれているコイル部分の長さＣＬ以上で
且つ孔２ａ，２ｂまでの長さであることが要求される。
また、開口部ＥＡは、図１（ハ）に図示する通り、接地
パターンＧＰに取囲まれる位置に配置されることが要求
される。このように、チョークコイル１の取り付け位置
に対向し、少なくとも幅Ｗがチョークコイル１の幅以上
であって、長さＬが当該チョークコイル１に巻かれてい
るコイル部分の長さＣＬ以上となる寸法の開口部ＥＡを
接地パターンＧＰに取囲まれるようにしたのは、プリン
ト基板ＰＷＢとチョークコイル１との間隙に空気の誘電
率を介在させることによって、浮遊容量成分を少なくし
てトラップの影響を低減する為である。The size of the opening EA is such that the width W is at least the width of the choke coil 1 and the length L is the length CL of the coil portion wound around the choke coil 1 and the holes 2a, 2b. Is required to be up to.
Further, the opening EA is required to be arranged at a position surrounded by the ground pattern GP as shown in FIG. As described above, the width W is at least the width of the choke coil 1 and the length L is at least the length CL of the coil portion wound around the choke coil 1, facing the mounting position of the choke coil 1. The size of the opening EA is surrounded by the ground pattern GP because the dielectric constant of air is interposed in the gap between the printed circuit board PWB and the choke coil 1 to reduce the stray capacitance component and influence the trap. This is to reduce

【００１３】図２は、こうした開口部ＥＡの有無による
分岐器の挿入損失特性を対比した図であり、図中の実線
で示す特性が開口部ＥＡを設けた場合を表わし、一方、
破線で示す特性が開口部ＥＡが無い場合を表わしてい
る。この図から明らかなように、開口部ＥＡを設けた場
合には、５００ＭＨｚ付近で発生していたトラップの影
響が０．４ｄＢ向上し、この結果、低域から高域にわた
って均一で安定した特性を得ることが可能になる。FIG. 2 is a diagram comparing the insertion loss characteristics of a branching device depending on the presence or absence of such an opening EA. The characteristics shown by the solid line in the figure represent the case where the opening EA is provided, while
The characteristic indicated by the broken line represents the case where there is no opening EA. As is clear from this figure, when the opening EA is provided, the effect of the trap generated near 500 MHz is improved by 0.4 dB, and as a result, a uniform and stable characteristic is obtained from the low range to the high range. It will be possible to obtain.

【００１４】したがって、本発明では、プリント基板Ｐ
ＷＢに上記関係で開口部ＥＡを穿設するだけで浮遊容量
成分が少なくなるので、従来のように、絶縁スペーサ２
を用いる必要がなくなり、これ故、作業性の低下やコス
トアップを招致することなく、トラップの影響を低減す
ることが可能になる訳である。なお、上述した実施例で
は、分岐器を一例に挙げて説明したが、これは勿論、電
流通過用のチョークコイルを備える分配器等の受動機器
であれば同様に適用可能である。Therefore, in the present invention, the printed circuit board P
Since the stray capacitance component is reduced only by forming the opening portion EA in WB in the above relationship, the insulating spacer
Therefore, it is possible to reduce the influence of the trap without lowering the workability and increasing the cost. In the above-described embodiment, the branching device has been described as an example, but this is of course applicable to any passive device such as a distributor including a choke coil for passing a current.

【００１５】[0015]

【発明の効果】本発明によれば、チョークコイルが配置
される基板位置に、周囲を接地パターンで囲んだ開口部
を設けることによって、基板とチョークコイルとの間隙
に空気の誘電率を介在させて浮遊容量成分を少なくし、
トラップの影響を低減しているので、絶縁スペーサを介
在させる従来のもののように、作業性の低下やコストア
ップを招致することなく、トラップの影響を低減するこ
とができる。According to the present invention, at the position of the substrate where the choke coil is arranged, the opening surrounded by the ground pattern is provided so that the permittivity of air is interposed in the gap between the substrate and the choke coil. Reduce the stray capacitance component,
Since the influence of the trap is reduced, it is possible to reduce the influence of the trap without lowering the workability and increasing the cost unlike the conventional one in which the insulating spacer is interposed.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明の一実施例におけるチョークコイル１の
基板装着形態を説明するための図である。FIG. 1 is a diagram for explaining a board mounting form of a choke coil 1 according to an embodiment of the present invention.

【図２】開口部ＥＡの有無による分岐器の挿入損失特性
を対比する特性図である。FIG. 2 is a characteristic diagram comparing the insertion loss characteristics of a branching device with and without an opening EA.

【図３】従来例を説明するための図である。FIG. 3 is a diagram for explaining a conventional example.

【図４】従来例を説明するための図である。FIG. 4 is a diagram for explaining a conventional example.

【符号の説明】[Explanation of symbols]

１ チョークコイル ＥＡ 開口部 ＧＰ 接地パターン ＰＷＢ プリント基板 1 Choke coil EA Opening GP Ground pattern PWB Printed circuit board

───────────────────────────────────────────────────── フロントページの続き (72)発明者 増澤 一浩 東京都品川区上大崎２丁目10番43号 ホー チキ株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuhiro Masuzawa 2-1043 Kamiosaki, Shinagawa-ku, Tokyo Hochiki Co., Ltd.

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 入出力端子間に電流通過用のチョークコ
イルを備える受動機器において、 少なくとも、幅Ｗが前記チョークコイルの幅以上であ
り、長さＬが前記チョークコイルのコイル部分の長さ以
上の寸法からなる開口部を、当該チョークコイルが対向
配置される基板位置に穿設すると共に、この開口部の周
囲に基板の接地パターンを敷設することを特徴とする受
動機器。1. A passive device including a choke coil for passing a current between input and output terminals, wherein at least a width W is equal to or greater than a width of the choke coil and a length L is equal to or greater than a length of a coil portion of the choke coil. A passive device characterized in that an opening having a size of 1 is formed at a position of a substrate where the choke coil is arranged to face, and a ground pattern of the substrate is laid around the opening.
JP30238195A 1995-11-21 1995-11-21 Passive equipment Expired - Fee Related JP3592814B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP30238195A JP3592814B2 (en) 1995-11-21 1995-11-21 Passive equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP30238195A JP3592814B2 (en) 1995-11-21 1995-11-21 Passive equipment

Publications (2)

Publication Number Publication Date
JPH09148143A true JPH09148143A (en) 1997-06-06
JP3592814B2 JP3592814B2 (en) 2004-11-24

Family

ID=17908228

Family Applications (1)

Application Number Title Priority Date Filing Date
JP30238195A Expired - Fee Related JP3592814B2 (en) 1995-11-21 1995-11-21 Passive equipment

Country Status (1)

Country Link
JP (1) JP3592814B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10720276B2 (en) 2016-12-14 2020-07-21 Murata Manufacturing Co., Ltd. Chip inductor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10720276B2 (en) 2016-12-14 2020-07-21 Murata Manufacturing Co., Ltd. Chip inductor

Also Published As

Publication number Publication date
JP3592814B2 (en) 2004-11-24

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