JPS63131237U - - Google Patents
Info
- Publication number
- JPS63131237U JPS63131237U JP19393986U JP19393986U JPS63131237U JP S63131237 U JPS63131237 U JP S63131237U JP 19393986 U JP19393986 U JP 19393986U JP 19393986 U JP19393986 U JP 19393986U JP S63131237 U JPS63131237 U JP S63131237U
- Authority
- JP
- Japan
- Prior art keywords
- double
- tuning
- circuit
- switching means
- switching
- 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.)
- Pending
Links
- 238000010586 diagram Methods 0.000 description 4
- 230000001629 suppression Effects 0.000 description 1
Landscapes
- Noise Elimination (AREA)
Description
第１図は本考案の一実施例の要部を示す回路図
、第２図は本考案の他の実施例を示す同様の回路
図、第３図は従来のテレビジヨンチユーナの要部
を示す回路図、第４図はそれらのイメージ周波数
抑圧特性を示す特性図である。
１……複同調回路、Ｃｘ１，Ｃｘ２……微小信
号路を構成する微小容量、Ｄ１，Ｄ２，Ｄｘ……
スイツチングダイオード。
Fig. 1 is a circuit diagram showing the main parts of one embodiment of the present invention, Fig. 2 is a similar circuit diagram showing another embodiment of the invention, and Fig. 3 shows the main parts of a conventional television tuner. The circuit diagram shown in FIG. 4 is a characteristic diagram showing their image frequency suppression characteristics. 1...Double tuning circuit, Cx 1 , Cx 2 ... Minute capacitance forming a minute signal path, D 1 , D 2 , Dx...
switching diode.
Claims (1)
ユーナに於いて、ミキサ回路の前段に配置された
ＶＨＦ複同調回路の一次側と二次側の同調コイル
を二次側に逆相出力が得られるような極性で誘導
結合すると共に、上記複同調回路の一次側の信号
を同相のまゝ二次側に導くイメージ周波数打消し
用の微小信号路を設けたチユーナに於いて、前記
微小信号路にスイツチング手段が含まれるように
構成し、このスイツチング手段を前記複同調回路
のバンド切換に応じてオン，オフさせるようにし
てなるテレビジヨンチユーナ。 (2) 前記スイツチング手段は前記複同調回路が
ロウバンド受信状態に切換えられたときに前記微
小信号路を無効化するよう動作することを特徴と
する登録請求の範囲第１項記載のテレビジヨンチ
ユーナ。 (3) 前記スイツチング手段は前記複同調回路の
同調コイルを切換えるスイツチングダイオードと
兼用されていることを特徴とする登録請求の範囲
第１項記載のテレビジヨンチユーナ。[Claims for Utility Model Registration] (1) In a tuner that uses a variable capacitance element as a tuning element, the tuning coils on the primary and secondary sides of the VHF double-tuned circuit placed before the mixer circuit are The tuner is inductively coupled with a polarity that provides a negative phase output on the side, and is provided with a minute signal path for image frequency cancellation that leads the signal on the primary side of the above-mentioned double-tuned circuit to the secondary side with the same phase. In the television tuner, the minute signal path includes switching means, and the switching means is turned on and off in response to band switching of the double tuning circuit. (2) The television tuner according to claim 1, wherein the switching means operates to disable the small signal path when the double tuning circuit is switched to a low band receiving state. . (3) The television tuner according to claim 1, wherein the switching means also serves as a switching diode for switching the tuning coil of the double tuning circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19393986U JPS63131237U (en) | 1986-09-19 | 1986-12-17 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14443986 | 1986-09-19 | ||
| JP19393986U JPS63131237U (en) | 1986-09-19 | 1986-12-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63131237U true JPS63131237U (en) | 1988-08-26 |
Family
ID=33455164
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19393986U Pending JPS63131237U (en) | 1986-09-19 | 1986-12-17 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63131237U (en) |
-
1986
- 1986-12-17 JP JP19393986U patent/JPS63131237U/ja active Pending