JPS56140221A - Photoelectric conversion circuit - Google Patents
Photoelectric conversion circuitInfo
- Publication number
- JPS56140221A JPS56140221A JP4380080A JP4380080A JPS56140221A JP S56140221 A JPS56140221 A JP S56140221A JP 4380080 A JP4380080 A JP 4380080A JP 4380080 A JP4380080 A JP 4380080A JP S56140221 A JPS56140221 A JP S56140221A
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- electric
- discharge diode
- electric discharge
- photoelectric conversion
- 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
- 238000006243 chemical reaction Methods 0.000 title abstract 3
- 239000003990 capacitor Substances 0.000 abstract 2
- 238000013459 approach Methods 0.000 abstract 1
- 230000001174 ascending effect Effects 0.000 abstract 1
- 238000005259 measurement Methods 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/44—Electric circuits
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Light Receiving Elements (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
PURPOSE:To improve response characteristic by providing a means to discharge an electric charge accumulated in a photoelectric conversion means following the turning ON of a power supply with regard to the titled circuit provided at a light measurement part of a photographic camera. CONSTITUTION:If a power supply switch S is closed to turn ON a power supply, an electric an electric charge which allows an antiphase input terminal (-) to be positive is accumulated in a junction capacity Cj of the photodiode PD. A cathode terminal on an electric discharge diode D has a voltage mounting toward a reference voltage Vref at a time constant which is determined by a resistance R and a capacitor C at the same time when a power supply is turned ON. During this ascending period, the electric discharge diode D indicates a normal direction characteristic, so that an electric charge accumulated in the junction capacity Cj of photodiode PD is discharged through the electric discharge diode D. If the potential of the capacitor C approaches the reference voltage Vref, the electric discharge diode D is noncontinuous. However, if a time constant is properly set, an output voltage Vo of an arithmetic amplifier OP is increased rapidly to a prearranged value, thus attaining the purpose of photoelectric conversion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4380080A JPS56140221A (en) | 1980-04-03 | 1980-04-03 | Photoelectric conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4380080A JPS56140221A (en) | 1980-04-03 | 1980-04-03 | Photoelectric conversion circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56140221A true JPS56140221A (en) | 1981-11-02 |
| JPS634124B2 JPS634124B2 (en) | 1988-01-27 |
Family
ID=12673815
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4380080A Granted JPS56140221A (en) | 1980-04-03 | 1980-04-03 | Photoelectric conversion circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56140221A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51134126A (en) * | 1975-05-16 | 1976-11-20 | Nippon Kogaku Kk <Nikon> | Light measure device for the camera |
-
1980
- 1980-04-03 JP JP4380080A patent/JPS56140221A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51134126A (en) * | 1975-05-16 | 1976-11-20 | Nippon Kogaku Kk <Nikon> | Light measure device for the camera |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS634124B2 (en) | 1988-01-27 |
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