JPH0233398Y2 - - Google Patents

Info

Publication number
JPH0233398Y2
JPH0233398Y2 JP11700584U JP11700584U JPH0233398Y2 JP H0233398 Y2 JPH0233398 Y2 JP H0233398Y2 JP 11700584 U JP11700584 U JP 11700584U JP 11700584 U JP11700584 U JP 11700584U JP H0233398 Y2 JPH0233398 Y2 JP H0233398Y2
Authority
JP
Japan
Prior art keywords
resonant line
circuit board
printed circuit
antenna loop
variable capacitance
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
Application number
JP11700584U
Other languages
Japanese (ja)
Other versions
JPS6133525U (en
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 filed Critical
Priority to JP11700584U priority Critical patent/JPS6133525U/en
Publication of JPS6133525U publication Critical patent/JPS6133525U/en
Application granted granted Critical
Publication of JPH0233398Y2 publication Critical patent/JPH0233398Y2/ja
Granted legal-status Critical Current

Links

Description

【考案の詳細な説明】 (イ) 産業上の利用分野 本考案はテレビジヨン受像機等に使用される電
子同調チユーナに関する。
[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to an electronic tuning tuner used in television receivers and the like.

(ロ) 従来の技術 第2図は可変容量ダイオードを同調素子とした
電子同調チユーナのUHF入力回路を示しており、
1は金属性のチユーナ筐体、2a,2bはUHF
入力端子、3は該端子2a,2bに接続されたア
ンテナループ4に一端が接続され他端が前記筐体
1に接続された保護用抵抗、5は一端が前記筐体
1と接続され他端が可変容量ダイオード6及び終
端容量7を介して筐体1と接続されたλ/2型共
振線路であつて、前記可変容量ダイオード6には
同調電圧供給用抵抗8を介して図示しない同調電
圧発生回路から同調電圧が与えられる。
(b) Prior art Figure 2 shows a UHF input circuit for an electronic tuning tuner using a variable capacitance diode as a tuning element.
1 is a metal tuner housing, 2a and 2b are UHF
Input terminal 3 is a protective resistor whose one end is connected to the antenna loop 4 connected to the terminals 2a and 2b and the other end is connected to the housing 1; 5 is a protective resistor whose one end is connected to the housing 1 and the other end; is a λ/2 type resonant line connected to the housing 1 via a variable capacitance diode 6 and a terminating capacitor 7, and the variable capacitance diode 6 is connected to a tuning voltage generator (not shown) via a tuning voltage supplying resistor 8. A tuning voltage is provided by the circuit.

第3図イ,ロ,ハは上記第2図に示されたアン
テナ入力回路を具体的に構成した場合における従
来例を示しており入力端子2a,2bは保持体2
に設けられており、その入力インピーダンスは
300Ωである。前記保持体2はチユーナ筐体1に
取付けられる。前記保持体2に設けられたアンテ
ナループ4は、一端部がプリント基板9に挿着さ
れた共振線路5と同調用可変容量ダイオード6及
び終端容量7〔図示せず〕からなる入力段の共振
回路10に誘導結合する。前記可変容量ダイオー
ド6の一方の端子6aと共振線路5の一端とは第
3図ハに明確に示されているように空中配線によ
つて接続される。この第3図の如き構造の場合に
は、電界強度が最も高くなる共振線路5と可変容
量ダイオード6の接続部と、アンテナループ4が
近接して配置されているのでUHF帯の低い周波
数から高い周波数域に亘つて、アンテナループ4
と共振回路10間の信号伝送が良好に行なわれる
が、共振線路5の一端と可変容量ダイオード6の
一端とを空中にて半田接続しなければならないと
いう欠点がある。
FIGS. 3A, 3B, and 3C show conventional examples in which the antenna input circuit shown in FIG.
The input impedance is
It is 300Ω. The holding body 2 is attached to the tuner housing 1. The antenna loop 4 provided on the holder 2 is an input stage resonant circuit consisting of a resonant line 5 whose one end is inserted into a printed circuit board 9, a tuning variable capacitance diode 6, and a terminating capacitor 7 (not shown). Inductively coupled to 10. One terminal 6a of the variable capacitance diode 6 and one end of the resonant line 5 are connected by an aerial wiring as clearly shown in FIG. 3C. In the case of the structure shown in Fig. 3, the connection between the resonant line 5 and the variable capacitance diode 6, where the electric field strength is highest, and the antenna loop 4 are arranged close to each other, so that the electric field strength is the highest, and the antenna loop 4 is located close to the connection point between the resonant line 5 and the variable capacitance diode 6. Antenna loop 4 over the frequency range
Although signal transmission between the resonant circuit 10 and the resonant circuit 10 is performed well, there is a drawback that one end of the resonant line 5 and one end of the variable capacitance diode 6 must be connected by soldering in the air.

第3図と同一部分には同一符号を付した第4図
の従来例では、可変容量ダイオード6の両極端子
6a,6bをプリント基板9に形成した孔(図示
せず)に挿着し、その両極端子6a,6bをプリ
ント基板9の裏面(配線パターン面)で半田付け
し、同様にコ字型をした共振線路11の両端部も
前記プリント基板9に挿着し、裏面で半田付けす
るとともに、その際共振線路11の一端と可変容
量ダイオード6の一方のリードをプリント基板9
の裏面に設けられた同一の銅箔パターンに半田付
けするようになつている。この構造のものであれ
ば接続が全てプリント基板9の半田付け処理で行
なえるので、半田デイツピング法により自動的に
半田接続できるという利点があるが、共振線路1
1の一端と可変容量ダイオード6の一方のリード
との接続部がプリント基板9の裏面側に位置する
のでアンテナループ4と共振線路11との結合が
粗になり信号伝送が良好に行えなくなる。そのた
め、インピーダンス整合損失が生じ信号の伝送特
性を悪化させるという欠点があつた。
In the conventional example shown in FIG. 4, in which the same parts as in FIG. Both terminals 6a and 6b are soldered on the back side (wiring pattern side) of the printed circuit board 9, and both ends of the U-shaped resonant line 11 are also inserted into the printed circuit board 9 and soldered on the back side. At that time, one end of the resonant line 11 and one lead of the variable capacitance diode 6 are connected to the printed circuit board 9.
It is designed to be soldered to the same copper foil pattern provided on the back side of the board. With this structure, all connections can be made by soldering the printed circuit board 9, which has the advantage of automatically making solder connections using the solder dipping method.
Since the connection between one end of the variable capacitance diode 1 and one lead of the variable capacitance diode 6 is located on the back side of the printed circuit board 9, the coupling between the antenna loop 4 and the resonant line 11 becomes rough, making it difficult to perform signal transmission well. Therefore, there was a drawback that impedance matching loss occurred and signal transmission characteristics deteriorated.

尚、実開昭58−96308号公報には共振線路及び
可変容量ダイオードの両端子をプリント基板に挿
着する形式のUHFチユーナが示されているが、
アンテナループと共振線路との誘導結合を良好に
するための構造については記載されていない。
Incidentally, Japanese Utility Model Application Publication No. 58-96308 discloses a UHF tuner in which both terminals of a resonant line and a variable capacitance diode are inserted into a printed circuit board.
There is no description of a structure for improving the inductive coupling between the antenna loop and the resonant line.

(ハ) 考案が解決しようとする問題点 本考案は共振線路及び可変容量ダイオードの両
端子が共にプリント基板に挿着される形式の
UHF入力回路を有する電子同調チユーナにおい
て、アンテナループと入力共振線路の信号伝送を
良好にすることを目的とする。
(c) Problems to be solved by the invention This invention is a type in which both the terminals of the resonant line and the variable capacitance diode are inserted into the printed circuit board.
The purpose of this study is to improve signal transmission between the antenna loop and the input resonant line in an electronically tuned tuner with a UHF input circuit.

(ニ) 問題点を解決するための手段 共振線路と可変容量ダイオードの両端子がプリ
ント基板に挿着され、それぞれの一方の端子がプ
リント基板の裏面側のパターンで接続され、アン
テナループが前記共振線路に近接して対向配置さ
れる形式のUHF入力回路を備えるものにおいて、
アンテナループの一部を囲む如く配置される折曲
片を共振線路の可変容量ダイオード接続側に設け
た。
(d) Means for solving the problem Both terminals of the resonant line and the variable capacitance diode are inserted into the printed circuit board, one terminal of each is connected with the pattern on the back side of the printed circuit board, and the antenna loop is connected to the resonant line. In those equipped with a UHF input circuit arranged close to and facing the railway line,
A bent piece arranged so as to surround a part of the antenna loop was provided on the variable capacitance diode connection side of the resonant line.

(ホ) 作用 上記の如く構成することにより、共振線路とア
ンテナループとの誘導結合が良好になる。
(e) Effect By configuring as described above, inductive coupling between the resonant line and the antenna loop becomes good.

(ヘ) 実施例 従来例と同一部分には同一符号を付した第1図
を参照しつつ説明するに、本考案ではコ字型をし
た平板導体からなるλ/2型共振線路12の両端
部及び可変容量ダイオード6の両極端子6a,6
bがプリント基板9に設けられた孔(図示せず)
に挿着されるとともに前記共振線路12の一端部
と可変容量ダイオード6の一方の端子6aがプリ
ント基板9の裏面9bに設けられた銅箔パターン
(図示せず)で半田接続される。そして、前記プ
リント基板9の表面9a側において、前記共振線
路12のうち前記可変容量ダイオード6との接続
点側にアンテナループ4の下端部を囲む如く配置
されるL字状の折曲片12aを一体に設けてい
る。この際、前記アンテナループ4と共振線路1
2の折曲片12aの内面との距離l〔第1図イ参
照〕は0〜1mmで略密着状態になるように配置さ
れる。これにより、プリント基板9による信号伝
送量の損失が補償されアンテナループ4と共振線
路12との誘導結合が良好に行なえる。
(F) Embodiment This will be explained with reference to FIG. 1, in which the same parts as in the conventional example are given the same reference numerals.In the present invention, both ends of the λ/2 type resonant line 12 made of a U-shaped flat plate conductor. and both terminals 6a, 6 of the variable capacitance diode 6
b is a hole provided in the printed circuit board 9 (not shown)
At the same time, one end of the resonant line 12 and one terminal 6a of the variable capacitance diode 6 are connected by solder through a copper foil pattern (not shown) provided on the back surface 9b of the printed circuit board 9. On the front surface 9a side of the printed circuit board 9, an L-shaped bent piece 12a is arranged to surround the lower end of the antenna loop 4 on the connection point side of the resonant line 12 with the variable capacitance diode 6. It is installed in one piece. At this time, the antenna loop 4 and the resonant line 1
The distance l (see FIG. 1A) from the inner surface of the second bent piece 12a is 0 to 1 mm, and the two bent pieces 12a are arranged so as to be in close contact with each other. This compensates for the loss in signal transmission amount due to the printed circuit board 9, and allows good inductive coupling between the antenna loop 4 and the resonant line 12.

(ト) 考案の効果 第5図乃至第7図は本考案による特性上の効果
を表わし、第5図は定在波比、第6図は電力利
得、第7図は雑音指数特性を示しており、実線が
本考案による場合、破線が第4図の従来例による
場合を示す。このように本考案によればアンテナ
ループと入力共振線路との間の結合が十分とな
り、伝送損失改善され、それに伴ない電力利得、
雑音指数の大幅改善がなされるという効果があ
る。
(g) Effects of the invention Figures 5 to 7 show the effects of the invention on characteristics. Figure 5 shows the standing wave ratio, Figure 6 shows the power gain, and Figure 7 shows the noise figure characteristics. The solid line shows the case according to the present invention, and the broken line shows the case according to the conventional example shown in FIG. As described above, according to the present invention, the coupling between the antenna loop and the input resonant line is sufficient, transmission loss is improved, and power gain and power gain are accordingly improved.
This has the effect of significantly improving the noise figure.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本考案を実施した電子同調チユーナの
要部を示す図であつて、同図イは平面図、同図ロ
は側面図、同図ハは斜視図である。第2図は電子
同調チユーナの要部回路図である。第3図は従来
の電子同調チユーナの要部を示す図であつて、同
図イは平面図、同図ロは側面図、同図ハは斜視図
である。第4図は他の従来例を示す図であつて、
同図イは平面図、同図ロは側面図である。第5
図、第6図及び第7図は本考案の効果を説明する
為の図である。 4……アンテナループ、6……可変容量ダイオ
ード、9……プリント基板、12……共振線路、
12a……折曲片。
FIG. 1 is a diagram showing the main parts of an electronic tuning tuner embodying the present invention, in which A is a plan view, B is a side view, and C is a perspective view. FIG. 2 is a circuit diagram of the main part of the electronic tuning tuner. FIG. 3 is a diagram showing the main parts of a conventional electronic tuning tuner, in which A is a plan view, B is a side view, and C is a perspective view. FIG. 4 is a diagram showing another conventional example,
Figure A is a plan view, and Figure B is a side view. Fifth
6 and 7 are diagrams for explaining the effects of the present invention. 4... Antenna loop, 6... Variable capacitance diode, 9... Printed circuit board, 12... Resonant line,
12a...Bent piece.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 両端部がプリント基板に挿着された共振線路の
一端部と、両極端子が前記プリント基板に挿着さ
れた可変容量ダイオードの一方の端子とが前記プ
リント基板を介して接続されるとともに前記共振
線路に対向してアンテナループが近接配置される
ことによりUHF入力回路が構成される電子同調
チユーナにおいて、前記アンテナループの一部を
囲む如く配置される折曲片を前記共振線路の前記
一端側に設けたことを特徴とする電子同調チユー
ナ。
One end of a resonant line whose both ends are inserted into the printed circuit board and one terminal of a variable capacitance diode whose both terminals are inserted into the printed circuit board are connected via the printed circuit board, and the resonant line In an electronic tuning tuner in which a UHF input circuit is configured by placing an antenna loop close to the antenna loop, a bent piece is provided on the one end side of the resonant line so as to surround a part of the antenna loop. An electronic tuning tuner characterized by:
JP11700584U 1984-07-30 1984-07-30 electronic tuning tuner Granted JPS6133525U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11700584U JPS6133525U (en) 1984-07-30 1984-07-30 electronic tuning tuner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11700584U JPS6133525U (en) 1984-07-30 1984-07-30 electronic tuning tuner

Publications (2)

Publication Number Publication Date
JPS6133525U JPS6133525U (en) 1986-02-28
JPH0233398Y2 true JPH0233398Y2 (en) 1990-09-07

Family

ID=30675918

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11700584U Granted JPS6133525U (en) 1984-07-30 1984-07-30 electronic tuning tuner

Country Status (1)

Country Link
JP (1) JPS6133525U (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2846482B2 (en) * 1991-01-28 1999-01-13 三菱電機株式会社 Filter / antenna device

Also Published As

Publication number Publication date
JPS6133525U (en) 1986-02-28

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