JPS6098941U

JPS6098941U - Up-down converter

Info

Publication number: JPS6098941U
Application number: JP10438784U
Authority: JP
Inventors: 貞夫矢口; 阿波　裕一; 鴨下　秀夫
Original assignee: ミツミ電機株式会社
Priority date: 1984-07-10
Filing date: 1984-07-10
Publication date: 1985-07-05
Also published as: JPH0112434Y2

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は本考案になるアップダウンコンバータの一実施
例の分解斜視図、第２図は第１図示のケース内の区画室
の配置を示す図、第３図は第１図示のコンバータの一部
の断面図、第４図は第１図示のコンバータの一部の等価
回路、第５図は第４図示の回路の選択特性を示す図、第
６区は本考案コンバータに適用されるアップダウンコン
バータの一例のブロック系統図、第７図は従来のアップ
ダウンコンバータのケース内の区画室の配置の一例を示
す図である。１・・・ケース、２〜４・・・側板、７ａ、７ｂ・・・
端子、９・・・プリント基板、１０〜１７・・・シール
ド板、１８〜２４，２６，２８，２９・・・区画室、２
５ａ、２５ｂ、２７ａ〜２７ｃ・・・ヘリカルコイル、
３０・・・内カバー、３１・・・折曲片、３２〜３６・
・・折曲片群、３７．４２・・・開口窓、３８．４３・
・・貫通Ｌ　４５　ａ、　　４５　ｂ・・・コイルボビ
ン、４６ａ、４６ｂ・・・コイル、４９　ａ、　　４９
　ｂ・・・コイルケース、５０ａ、５０ｂ・・・結合窓
、５１ａ、５１ｂ・・・ネジコア、６０・・・入力フィ
ルタ回路、６１・・・第１局部発振器、６２．６７・・
・増幅器、６３・・・第１混合器、６４・・・第１複同
調回路、６６・・・第２複同調回路、６７・・・第２混
合器、６８・・・第２局部発振器、６９・・・出力フィ
ルタ回路、７ｏ・・・分周器、７１・・・位相比較器、
７２・・・発振器、７４・・・可変分周器、７５・・・
低域フィルタ。Fig. 1 is an exploded perspective view of one embodiment of the up-down converter according to the present invention, Fig. 2 is a diagram showing the arrangement of compartments in the case shown in Fig. 1, and Fig. 3 is an illustration of the converter shown in Fig. 1. 4 is a partial equivalent circuit of the converter shown in FIG. 1, FIG. 5 is a diagram showing selection characteristics of the circuit shown in FIG. 4, and Section 6 is an up-down diagram applied to the converter of the present invention. FIG. 7, a block system diagram of an example of a converter, is a diagram showing an example of the arrangement of compartments in a case of a conventional up-down converter. 1... Case, 2-4... Side plate, 7a, 7b...
Terminal, 9... Printed circuit board, 10-17... Shield plate, 18-24, 26, 28, 29... Compartment, 2
5a, 25b, 27a to 27c...helical coil,
30...Inner cover, 31...Folded piece, 32-36.
...Folded piece group, 37.42...Opening window, 38.43.
...Penetration L 45 a, 45 b...Coil bobbin, 46a, 46b...Coil, 49 a, 49
b... Coil case, 50a, 50b... Coupling window, 51a, 51b... Screw core, 60... Input filter circuit, 61... First local oscillator, 62.67...
- Amplifier, 63... First mixer, 64... First double tuned circuit, 66... Second double tuned circuit, 67... Second mixer, 68... Second local oscillator, 69... Output filter circuit, 7o... Frequency divider, 71... Phase comparator,
72... Oscillator, 74... Variable frequency divider, 75...
low pass filter.

Claims

[Scope of utility model registration request]

mixing an incoming cable television signal with a first local oscillator frequency signal into an intermediate frequency signal of a fixed frequency band higher than the frequency band of the cable television signal; In an up-down converter, the up-down converter performs tuning selection by a second tuning circuit and then mixes it with a second local oscillation frequency signal to produce a television signal in a constant frequency band lower than the frequency band of the intermediate frequency signal.
The two opposing sides of the case having a rectangular cross section are separated into two parts by a double shield plate, and the input circuit, the first local oscillator, and the first mixer are installed in one of the two parts. the first tuning circuit, the second tuning circuit, the second local oscillation circuit, the second mixer and the output circuit are respectively arranged in the other part of the two parts; 1. An up-down converter, wherein a first tuned circuit of the section is disposed between the second tuned circuit and the first local oscillator.