JPS56115577A - Photodetecting circuit - Google Patents
Photodetecting circuitInfo
- Publication number
- JPS56115577A JPS56115577A JP1938480A JP1938480A JPS56115577A JP S56115577 A JPS56115577 A JP S56115577A JP 1938480 A JP1938480 A JP 1938480A JP 1938480 A JP1938480 A JP 1938480A JP S56115577 A JPS56115577 A JP S56115577A
- Authority
- JP
- Japan
- Prior art keywords
- photodetector
- light emitting
- emitting element
- resistor
- voltage
- 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
- 238000001514 detection method Methods 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Light Receiving Elements (AREA)
- Optical Communication System (AREA)
Abstract
PURPOSE:To prevent the variation in the temperature of the detecting characteristics of the photodetecting circuit having a light emitting element and a photodetector by forming a photodetector for receiving the light from the light emitting element in series with the light emitting element and controlling the output of the photodetector so as to be always constant. CONSTITUTION:The light emitting element 1 and the photodetector 2 form a photodetector PS1 for generating a control signal, and the light emitting element 3 and the photodetector 4 form a photodetector PS2 for generating a detection signal. The voltage produced at a resistor R2 due to the output current of the photodetector PS1 is applied through a resistor R3 to a differential amplifier 7, and compared with a voltage divided via resistors R4, R5 from the reference voltage Vs of a reference power source 6. The output of the amplifier 7 is applied to the base of a transistor 5. Since the transistor 5 is so controlled that the voltage across the resistor R2 becomes constant, even if the characteristics of the light emitting element and the photodetector are altered, the variation in the detecting characteristics can be prevented.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1938480A JPS56115577A (en) | 1980-02-19 | 1980-02-19 | Photodetecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1938480A JPS56115577A (en) | 1980-02-19 | 1980-02-19 | Photodetecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS56115577A true JPS56115577A (en) | 1981-09-10 |
Family
ID=11997800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1938480A Pending JPS56115577A (en) | 1980-02-19 | 1980-02-19 | Photodetecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56115577A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62226672A (en) * | 1986-03-24 | 1987-10-05 | マイテル・コ−ポレ−シヨン | Photoelectric sensitive diode device and manufacture of the same |
-
1980
- 1980-02-19 JP JP1938480A patent/JPS56115577A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62226672A (en) * | 1986-03-24 | 1987-10-05 | マイテル・コ−ポレ−シヨン | Photoelectric sensitive diode device and manufacture of the same |
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