JPS5544906A - Photosensor - Google Patents
PhotosensorInfo
- Publication number
- JPS5544906A JPS5544906A JP11743778A JP11743778A JPS5544906A JP S5544906 A JPS5544906 A JP S5544906A JP 11743778 A JP11743778 A JP 11743778A JP 11743778 A JP11743778 A JP 11743778A JP S5544906 A JPS5544906 A JP S5544906A
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- voltage
- detecting end
- power supply
- environmental temperature
- 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.)
- Pending
Links
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)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
PURPOSE:To reduce the detected voltage variations at the detecting end of a photosensor with respect to the environmental temperature by connecting a compensating transistor connected at its base to the voltage dividing point of resistors provided between the detecting end and a power supply between a voltage converting resistors and the power supply. CONSTITUTION:When the environmental temperature is altered, the output current of a phototransistor 3 and current amplification rate of an amplifier transistor 4 are varied, and the current amplification rate of the transistor 7 is also similarly varied simultaneously. Accordingly, the equivalent resistance of the circuit from a detecting end 5 including the transistor 7 to a power supply is also similarly altered corresponding to the equivalent resistance to meet the change of the output current of the transistor 4. Therefore, the voltage rise of the detecting end 5 by the transistor 4 is cancelled by the voltage drop of the transistor 7 with the result that the detected voltage at the end 5 is hardly affected by the change of the environmental temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11743778A JPS5544906A (en) | 1978-09-26 | 1978-09-26 | Photosensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11743778A JPS5544906A (en) | 1978-09-26 | 1978-09-26 | Photosensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5544906A true JPS5544906A (en) | 1980-03-29 |
Family
ID=14711619
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11743778A Pending JPS5544906A (en) | 1978-09-26 | 1978-09-26 | Photosensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5544906A (en) |
-
1978
- 1978-09-26 JP JP11743778A patent/JPS5544906A/en active Pending
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