JPH0178427U - - Google Patents
Info
- Publication number
- JPH0178427U JPH0178427U JP1987175629U JP17562987U JPH0178427U JP H0178427 U JPH0178427 U JP H0178427U JP 1987175629 U JP1987175629 U JP 1987175629U JP 17562987 U JP17562987 U JP 17562987U JP H0178427 U JPH0178427 U JP H0178427U
- Authority
- JP
- Japan
- Prior art keywords
- radio wave
- tuning circuit
- band
- bands
- 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.)
- Pending
Links
- 238000010586 diagram Methods 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 1
Landscapes
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Description
第１図は本考案の電子チユーナの原理を示した
基本構成図、第２図は第１の同調回路、第３図は
第２の同調回路の構成図、第４図は１個の可変容
量ダイオードを用いて構成した同調回路（第１〜
第３の同調回路を組込んだもの）の構成図を示し
ている。
（符号の説明）、ＶＲ，ＶＲ１，ＶＲ２……可
変容量ダイオード、Ｌ１〜Ｌ３，Ｌ１′〜Ｌ３′
……インダクタ、ＩＮ……インプツト端子、１３
，２３……第１、第２の同調回路、３０……同調
回路。
Figure 1 is a basic configuration diagram showing the principle of the electronic tuner of the present invention, Figure 2 is a configuration diagram of the first tuning circuit, Figure 3 is a configuration diagram of the second tuning circuit, and Figure 4 is a diagram of one variable capacitor. Tuning circuit configured using diodes (first to
FIG. 12 shows a configuration diagram of a third tuning circuit (incorporating a third tuning circuit). (Explanation of symbols), VR, VR1, VR2...variable capacitance diode, L1 to L3, L1' to L3'
...Inductor, IN...Input terminal, 13
, 23...first and second tuned circuits, 30...tuned circuits.
Claims (1)
した電波信号を、可変容量ダイオードとインダク
タを組合わせた同調回路を通じて選択的に受信す
るようにしたテレビ用電子チユーナであつて、 上記電波信号は、１つのインプツト端子より入
力され、上記同調回路は、上記電波信号をそれぞ
れの区分が連続した周波数を含む３バンドに区分
して受信するようにしてあり、かつ各々のバンド
内に含まれる電波信号の受信に対応した上記可変
容量ダイオードの容量変化比が上記３つのバンド
において略同一に設定していることを特徴とする
テレビ用電子チユーナ。 (2) 上記同調回路は、高い周波数チヤンネル群
に割当られた第１バンドに含まれた電波信号を選
択的に受信する第１の同調回路と、この第１のバ
ンドより低い周波数チヤンネル群に割当られた第
２、第３バンドに含まれた電波信号を選択的に受
信する第２の同調回路とを組合わせて構成されて
おり、上記第１の同調回路は１つの可変容量ダイ
オードとインダクタを組合わせて成り、上記第２
の同調回路は別の可変容量ダイオードと上記第２
、第３バンドに含まれた電波信号の受信時に切換
接続される別の２つのインダクタを組合わせて成
る実用新案登録請求の範囲第１項記載のテレビ用
電子チユーナ。[Claims for Utility Model Registration] (1) An electronic tuner for television that selectively receives radio signals with continuous frequencies ranging from VHF to UHF bands through a tuned circuit that combines a variable capacitance diode and an inductor. The radio wave signal is inputted from one input terminal, and the tuning circuit receives the radio wave signal by dividing it into three bands, each of which includes continuous frequencies, and An electronic tuner for television, characterized in that a capacitance change ratio of the variable capacitance diode corresponding to reception of radio wave signals included in the band is set to be substantially the same in the three bands. (2) The above-mentioned tuning circuit includes a first tuning circuit that selectively receives radio wave signals included in a first band assigned to a group of high frequency channels, and a first tuning circuit that selectively receives radio wave signals included in a first band assigned to a group of frequency channels lower than this first band. and a second tuning circuit that selectively receives radio wave signals included in the second and third bands, and the first tuning circuit includes one variable capacitance diode and an inductor. It consists of a combination of the above second
The tuning circuit consists of another variable capacitance diode and the second
, the television electronic tuner according to claim 1, which is a combination of two other inductors that are switched and connected when receiving a radio wave signal included in the third band.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987175629U JPH0178427U (en) | 1987-11-17 | 1987-11-17 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987175629U JPH0178427U (en) | 1987-11-17 | 1987-11-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0178427U true JPH0178427U (en) | 1989-05-26 |
Family
ID=31467414
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987175629U Pending JPH0178427U (en) | 1987-11-17 | 1987-11-17 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0178427U (en) |
-
1987
- 1987-11-17 JP JP1987175629U patent/JPH0178427U/ja active Pending
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