JPS58461U - Leakage current suppression method for printed wiring circuit networks - Google Patents
Leakage current suppression method for printed wiring circuit networksInfo
- Publication number
- JPS58461U JPS58461U JP1982073631U JP7363182U JPS58461U JP S58461 U JPS58461 U JP S58461U JP 1982073631 U JP1982073631 U JP 1982073631U JP 7363182 U JP7363182 U JP 7363182U JP S58461 U JPS58461 U JP S58461U
- Authority
- JP
- Japan
- Prior art keywords
- leakage current
- printed wiring
- circuit network
- suppression method
- wiring circuit
- 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
Landscapes
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Exposure Control For Cameras (AREA)
- Camera Bodies And Camera Details Or Accessories (AREA)
- Structure Of Printed Boards (AREA)
- Amplifiers (AREA)
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
第１図は従来の測光回路の二側を示す回路接続図、第２
図はリーク電流による測光回路の特性劣化を示す曲線図
、第３図は本考案によるリーク電流抑制方式の一実施例
を示す回路接続図、第４図は本考案のリーク電流抑制方
式を施したプリント２配線板の平面図である。
１００・・・演算増幅器、１０１・・・光電変換素子、
１０２・・・対数圧縮用ダイオード、・１０３・・・オ
フセット調整抵抗、１０４・・・表示用メーター、１０
５・・・表示回路の調整抵抗、１゛０６・・・定電圧源
、１０７・・・調整用抵抗、１０Ｂ・・・電源電池、１
０９・・・電源スィッチ、’１１０，１１１・・・リー
ク電流の等価抵抗、１１２，１１２’・・・・・・ガー
ドライン、１１３・・・プリント配線基板。Figure 1 is a circuit connection diagram showing the two sides of a conventional photometric circuit;
The figure is a curve diagram showing characteristic deterioration of the photometric circuit due to leakage current, Figure 3 is a circuit connection diagram showing an example of the leakage current suppression method according to the present invention, and Figure 4 is a curve diagram showing the characteristic deterioration of the photometric circuit due to leakage current. FIG. 2 is a plan view of the printed wiring board 2. FIG. 100... operational amplifier, 101... photoelectric conversion element,
102... Logarithmic compression diode, 103... Offset adjustment resistor, 104... Display meter, 10
5... Display circuit adjustment resistor, 1゛06... Constant voltage source, 107... Adjustment resistor, 10B... Power supply battery, 1
09... Power switch, '110, 111... Equivalent resistance of leakage current, 112, 112'... Guard line, 113... Printed wiring board.
Claims (1)
変換素子を電流モードで駆動する測光回路網をプリント
配線基板上に配設すると共に、少なくとも前記測光回路
網の上記入力部を囲むガードラインを上記基板上にプリ
ント配線し、該ガードラインに前記測光回路網の入力部
電位と約同電位を印加したことを特徴とするカメラ用測
光回路網のリーク電流抑制方式。A photometric circuit network having an input section connected to a photoelectric conversion element for receiving subject light and driving the photoelectric conversion element in a current mode is disposed on a printed wiring board, and a guard line surrounding at least the input section of the photometry circuit network. A method for suppressing leakage current in a photometric circuit network for a camera, characterized in that: is printed on the substrate, and approximately the same potential as the input potential of the photometric circuit network is applied to the guard line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1982073631U JPS5915091Y2 (en) | 1982-05-20 | 1982-05-20 | Leakage current suppression method for printed wiring circuit networks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1982073631U JPS5915091Y2 (en) | 1982-05-20 | 1982-05-20 | Leakage current suppression method for printed wiring circuit networks |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58461U true JPS58461U (en) | 1983-01-05 |
| JPS5915091Y2 JPS5915091Y2 (en) | 1984-05-04 |
Family
ID=29869403
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1982073631U Expired JPS5915091Y2 (en) | 1982-05-20 | 1982-05-20 | Leakage current suppression method for printed wiring circuit networks |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5915091Y2 (en) |
-
1982
- 1982-05-20 JP JP1982073631U patent/JPS5915091Y2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5915091Y2 (en) | 1984-05-04 |
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