JPS5882633U - Photometric circuit - Google Patents
Photometric circuitInfo
- Publication number
- JPS5882633U JPS5882633U JP17914581U JP17914581U JPS5882633U JP S5882633 U JPS5882633 U JP S5882633U JP 17914581 U JP17914581 U JP 17914581U JP 17914581 U JP17914581 U JP 17914581U JP S5882633 U JPS5882633 U JP S5882633U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- photoelectric conversion
- conversion element
- pnp transistor
- photometric 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
- Photometry And Measurement Of Optical Pulse Characteristics (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) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は本考案による一実施例を示す回路図、第２図は
同実施例の要部ＰＮＰ ）ランジスタの断面斜視図であ
る。
１：フォトダイオール１２：演算増幅器、３：対数圧縮
用トランジスタ、４：電圧源、５ニスイツチングトラン
ジスタ、６：抵抗、７，８：カレントミラー、９：抵抗
、１０：タイマー回路。FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a cross-sectional perspective view of a main part of the PNP transistor of the embodiment. 1: Photo diol 12: Operational amplifier, 3: Logarithmic compression transistor, 4: Voltage source, 5 Niswitching transistor, 6: Resistor, 7, 8: Current mirror, 9: Resistor, 10: Timer circuit.
Claims (1)
ロワ接続された演算増幅器を備え、光電変換素子の電流
を対数圧縮して出力を導出する回路であって、光電変換
素子と並列に挿入された電流源により電源投入時に短い
時間だけ電流を流して応答を改善した測光回路において
、上記電流源は、ＰＮＰトランジスタを含んでなり、該
ＰＮＰトランジスタがカットオフ時に、ＰＮＰトランジ
スタのベース及びエミッタがコレクタと同電位に保たれ
るようベース及びエミッタを上記演算増幅器の出力に接
続してなることを特徴とする測光回路。A circuit in which a photoelectric conversion element is connected between the positive and negative input terminals, and an operational amplifier connected as a follower, logarithmically compresses the current of the photoelectric conversion element to derive an output, and the circuit is connected in parallel with the photoelectric conversion element. In a photometric circuit in which the response is improved by passing current for a short time when the power is turned on by an inserted current source, the current source includes a PNP transistor, and when the PNP transistor is cut off, the base and emitter of the PNP transistor are connected to each other. A photometric circuit characterized in that the base and emitter are connected to the output of the operational amplifier so that the voltage is maintained at the same potential as the collector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17914581U JPS5882633U (en) | 1981-11-30 | 1981-11-30 | Photometric circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17914581U JPS5882633U (en) | 1981-11-30 | 1981-11-30 | Photometric circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5882633U true JPS5882633U (en) | 1983-06-04 |
| JPS6229932Y2 JPS6229932Y2 (en) | 1987-08-01 |
Family
ID=29974572
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17914581U Granted JPS5882633U (en) | 1981-11-30 | 1981-11-30 | Photometric circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5882633U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5293327A (en) * | 1976-02-02 | 1977-08-05 | Yashica Co Ltd | Electric shutter circuit |
-
1981
- 1981-11-30 JP JP17914581U patent/JPS5882633U/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5293327A (en) * | 1976-02-02 | 1977-08-05 | Yashica Co Ltd | Electric shutter circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6229932Y2 (en) | 1987-08-01 |
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