JPH01139639U - - Google Patents
Info
- Publication number
- JPH01139639U JPH01139639U JP1988080918U JP8091888U JPH01139639U JP H01139639 U JPH01139639 U JP H01139639U JP 1988080918 U JP1988080918 U JP 1988080918U JP 8091888 U JP8091888 U JP 8091888U JP H01139639 U JPH01139639 U JP H01139639U
- Authority
- JP
- Japan
- Prior art keywords
- uhf
- circuit
- vhf
- circuit section
- band
- 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
Links
- 239000003990 capacitor Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
Description
第１図は本考案のチユーナ装置の実施例を示す
要部回路図、第２図ａ，ｂはその作用を説明する
ための図、第３図は本考案の効果を説明するため
の図、第４図は従来のチユーナ装置の要部回路図
、第５図は従来の欠点を説明するための図である
。
１……シヤント回路、５……ＶＨＦチユーナ部
、６……ＵＨＦチユーナ部、７……ＵＨＦ入力同
調回路、ＡＮＴ……アンテナ入力端子、Ｄ１……
スイツチングダイオード。
FIG. 1 is a main circuit diagram showing an embodiment of the tuner device of the present invention, FIGS. 2 a and b are diagrams for explaining its operation, and FIG. 3 is a diagram for explaining the effects of the present invention. FIG. 4 is a circuit diagram of a main part of a conventional tuner device, and FIG. 5 is a diagram for explaining the drawbacks of the conventional tuner device. 1... shunt circuit, 5... VHF tuner section, 6... UHF tuner section, 7... UHF input tuning circuit, ANT... antenna input terminal, D 1 ...
switching diode.
Claims (1)
ナ入力端子と、前記アンテナ入力端子から入力さ
れた信号をバンド切換え信号に応じてＶＨＦ回路
部またはＵＨＦ回路部に導くスイツチング手段と
、前記ＶＨＦ回路部とＵＨＦ回路部間に設けられ
ＵＨＦ受信時にバンド切換え信号に応じてＶＨＦ
回路部とＵＨＦ回路部間を実質的に遮断するシヤ
ント回路と、前記ＵＨＦ回路部に設けられたＵＨ
Ｆ入力同調回路とを備え、前記シヤフト回路を構
成する素子及び前記ＵＨＦ入力同調回路を構成す
る素子の値を、ＵＨＦ受信時にＶＨＦ帯に生じる
前記ＵＨＦ入力同調回路の整合点がオン・エアー
・テレビ放送のＶＨＦハイバンドとＵＨＦバンド
との間に存在し且つその整合点に於ける整合度が
小さくなるように選定してなるチユーナ装置。 (2) 前記シヤント回路はインダクタンスとコン
デンサの直列回路を備え、その直列回路の共振に
よるトラツプ周波数が前記整合点に選定されてな
る請求項１記載のチユーナ装置。[Claims for Utility Model Registration] (1) An antenna input terminal to which VHF and UHF signals are supplied, and switching for guiding the signal input from the antenna input terminal to a VHF circuit section or a UHF circuit section according to a band switching signal. and a means provided between the VHF circuit section and the UHF circuit section to switch between VHF and UHF circuits according to a band switching signal when receiving UHF.
a shunt circuit that substantially cuts off between the circuit section and the UHF circuit section; and a UHF circuit provided in the UHF circuit section.
A matching point of the UHF input tuning circuit that occurs in the VHF band during UHF reception is set to an on-air television. A tuner device that exists between a broadcasting VHF high band and a UHF band and is selected so that the degree of matching at the matching point is small. (2) The tuner device according to claim 1, wherein the shunt circuit includes a series circuit of an inductance and a capacitor, and a trap frequency due to resonance of the series circuit is selected as the matching point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988080918U JPH0724826Y2 (en) | 1987-11-18 | 1988-06-17 | Tuner device |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62-175957 | 1987-11-18 | ||
| JP17595787 | 1987-11-18 | ||
| JP1988080918U JPH0724826Y2 (en) | 1987-11-18 | 1988-06-17 | Tuner device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01139639U true JPH01139639U (en) | 1989-09-25 |
| JPH0724826Y2 JPH0724826Y2 (en) | 1995-06-05 |
Family
ID=31718533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988080918U Expired - Fee Related JPH0724826Y2 (en) | 1987-11-18 | 1988-06-17 | Tuner device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0724826Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011249982A (en) * | 2010-05-25 | 2011-12-08 | Alps Electric Co Ltd | Input tuning circuit for television tuner |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62141230U (en) * | 1986-02-28 | 1987-09-05 |
-
1988
- 1988-06-17 JP JP1988080918U patent/JPH0724826Y2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62141230U (en) * | 1986-02-28 | 1987-09-05 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011249982A (en) * | 2010-05-25 | 2011-12-08 | Alps Electric Co Ltd | Input tuning circuit for television tuner |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0724826Y2 (en) | 1995-06-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |