JPH0271255U - - Google Patents
Info
- Publication number
- JPH0271255U JPH0271255U JP15119388U JP15119388U JPH0271255U JP H0271255 U JPH0271255 U JP H0271255U JP 15119388 U JP15119388 U JP 15119388U JP 15119388 U JP15119388 U JP 15119388U JP H0271255 U JPH0271255 U JP H0271255U
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- light emitting
- photodetector
- emitting element
- change
- 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
- 230000003321 amplification Effects 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 6
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
- Fire-Detection Mechanisms (AREA)
Description
第１図乃至第４図は本考案の一実施例を示すも
のであつて、第１図は光検出器の一例としての煙
感知器の概略構成図、第２図は信号増幅回路の回
路図、第３図はサーミスタの温度―抵抗特性図、
第４図は信号増幅回路の温度―利得特性図を示す
。第５図および第６図は従来例を説明するもので
あつて、第５図は周囲温度に対する発光素子の相
対光出力および光検知器の相対感度の変化を示す
温度特性図、第６図は周囲温度に応じて発光素子
の駆動電流を変化させることにより、発光素子の
相対光出力が一定になることを示す温度特性図で
ある。
４は発光ダイオード、７はホトダイオード、１
１は増幅器、１３はサーミスタ、Ｒｔは感温抵抗
素子、Ｒ２は帰還抵抗である。
1 to 4 show an embodiment of the present invention, in which FIG. 1 is a schematic configuration diagram of a smoke detector as an example of a photodetector, and FIG. 2 is a circuit diagram of a signal amplification circuit. , Figure 3 is the temperature-resistance characteristic diagram of the thermistor,
FIG. 4 shows a temperature-gain characteristic diagram of the signal amplifier circuit. 5 and 6 explain a conventional example, in which FIG. 5 is a temperature characteristic diagram showing changes in the relative light output of the light emitting element and the relative sensitivity of the photodetector with respect to ambient temperature, and FIG. FIG. 7 is a temperature characteristic diagram showing that the relative light output of the light emitting element becomes constant by changing the driving current of the light emitting element according to the ambient temperature. 4 is a light emitting diode, 7 is a photodiode, 1
1 is an amplifier, 13 is a thermistor, Rt is a temperature sensitive resistance element, and R2 is a feedback resistor.
Claims (1)
光素子と受光素子とを有する光検出器において、 受光素子の信号増幅回路中に感温抵抗素子を設
け、雰囲気の温度変化に伴つて、上記信号増幅回
路の利得を変化させて上記温度変化による発光素
子の光出力の変化を補償するように構成したこと
を特徴とする光検出器の温度補償装置。[Scope of Claim for Utility Model Registration] In a photodetector having a light emitting element and a light receiving element installed in an atmosphere that undergoes the same temperature change, a temperature sensitive resistor element is provided in the signal amplification circuit of the light receiving element to increase the temperature of the atmosphere. 1. A temperature compensation device for a photodetector, characterized in that the gain of the signal amplification circuit is changed in accordance with a temperature change to compensate for a change in the light output of a light emitting element due to the temperature change.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15119388U JPH0271255U (en) | 1988-11-18 | 1988-11-18 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15119388U JPH0271255U (en) | 1988-11-18 | 1988-11-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0271255U true JPH0271255U (en) | 1990-05-30 |
Family
ID=31425020
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15119388U Pending JPH0271255U (en) | 1988-11-18 | 1988-11-18 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0271255U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006139216A (en) * | 2004-11-15 | 2006-06-01 | Ricoh Co Ltd | Mark detecting apparatus, drive controller and image forming apparatus |
-
1988
- 1988-11-18 JP JP15119388U patent/JPH0271255U/ja active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006139216A (en) * | 2004-11-15 | 2006-06-01 | Ricoh Co Ltd | Mark detecting apparatus, drive controller and image forming apparatus |
| JP4676746B2 (en) * | 2004-11-15 | 2011-04-27 | 株式会社リコー | Drive control device and image forming apparatus |
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