JPS59176937U - Camera photometry circuit - Google Patents
Camera photometry circuitInfo
- Publication number
- JPS59176937U JPS59176937U JP6303484U JP6303484U JPS59176937U JP S59176937 U JPS59176937 U JP S59176937U JP 6303484 U JP6303484 U JP 6303484U JP 6303484 U JP6303484 U JP 6303484U JP S59176937 U JPS59176937 U JP S59176937U
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- terminal
- variable resistor
- meter
- constant current
- 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
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一例を示す回路図、第２図、
第３図、第４図は夫々この発明の実施例を示す回路図で
ある。
ＲＡ・・・フィルム感度導入用の第１の可変抵抗、ＲＦ
・・・絞り値導入用の第２の可変抵抗、ＲＬ・・・光導
電素子、Ｍ・・・メータ、Ｅ・・・電源、Ｔｒｌ、Ｔｒ
２・・・トランジスタ、２・・・定電流源。Figure 1 is a circuit diagram showing an example of a conventional photometric circuit;
3 and 4 are circuit diagrams showing embodiments of the present invention, respectively. RA...first variable resistor for introducing film sensitivity, RF
...Second variable resistor for introducing aperture value, RL...Photoconductive element, M...Meter, E...Power supply, Trl, Tr
2...transistor, 2...constant current source.
Claims (1)
ャッタスピードのうちの一方を導入する第２の可変抵抗
と、カメラの前面輝度によって抵抗値が変化する光導電
素子との並列回路を電源の一方の端子とトランジスタの
エミッタとの間に接続し、該トランジスタのコレクタと
前記電源の他方の端子との間にメータを接続すると共に
、前記トランジスタのベースを前記電源の他方の端子に
接続して該トランジスタを常に導通状態とし、さらに該
トランジスタのエミッタと前記電源の他方の端子との間
に定電流源を接続し、前記第１の可変抵抗と第２の可変
抵抗と光導電素子との並列回路に流れる電流から前記定
電流源によって一定電流を吸収し、前記メータに前記絞
り値又はシャッタスピードのうちの他方に対応する適正
電流を流すようにしたカメラの測光回路。A parallel circuit consisting of a first variable resistor for introducing film sensitivity, a second variable resistor for introducing either aperture value or shutter speed, and a photoconductive element whose resistance value changes depending on the front brightness of the camera is powered. a meter is connected between one terminal of the transistor and the emitter of the transistor, a meter is connected between the collector of the transistor and the other terminal of the power source, and the base of the transistor is connected to the other terminal of the power source. to keep the transistor in a conductive state at all times, further connect a constant current source between the emitter of the transistor and the other terminal of the power supply, and connect the first variable resistor, the second variable resistor, and the photoconductive element. A photometry circuit for a camera, wherein a constant current is absorbed by the constant current source from a current flowing in a parallel circuit, and an appropriate current corresponding to the other of the aperture value or shutter speed is caused to flow through the meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6303484U JPS6023713Y2 (en) | 1984-05-01 | 1984-05-01 | Camera photometry circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6303484U JPS6023713Y2 (en) | 1984-05-01 | 1984-05-01 | Camera photometry circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59176937U true JPS59176937U (en) | 1984-11-27 |
| JPS6023713Y2 JPS6023713Y2 (en) | 1985-07-15 |
Family
ID=30193224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6303484U Expired JPS6023713Y2 (en) | 1984-05-01 | 1984-05-01 | Camera photometry circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6023713Y2 (en) |
-
1984
- 1984-05-01 JP JP6303484U patent/JPS6023713Y2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6023713Y2 (en) | 1985-07-15 |
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