JPH01147533U - - Google Patents
Info
- Publication number
- JPH01147533U JPH01147533U JP1988041958U JP4195888U JPH01147533U JP H01147533 U JPH01147533 U JP H01147533U JP 1988041958 U JP1988041958 U JP 1988041958U JP 4195888 U JP4195888 U JP 4195888U JP H01147533 U JPH01147533 U JP H01147533U
- Authority
- JP
- Japan
- Prior art keywords
- light
- signal
- resistor
- comparing
- 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
- 238000010586 diagram Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
Landscapes
- Electronic Switches (AREA)
- Optical Communication System (AREA)
Description
第１図は本考案の一実施例に係る光センサ回路
の回路図、第２図は従来における光センサ回路の
回路図、第３図は、第２図の光センサ回路の出力
信号に与える外乱光の影響を示すための図である
。
１１……受光回路（受光手段１２と負荷抵抗１
３より成る回路）、１２……受光手段（受光トラ
ンジスタ）、１３……負荷抵抗、１４……信号変
換手段（ローパスフイルタ）、１５……比較手段
（非反転増幅器）、１６……抵抗、１７……カレ
ントミラー回路、１８……第１のトランジスタ（
入力側のＰＮＰ型トランジスタ）、１９……第２
のトランジスタ（出力側のＰＮＰ型トランジスタ
）、３１……発光手段（発光ダイオード）。
Fig. 1 is a circuit diagram of an optical sensor circuit according to an embodiment of the present invention, Fig. 2 is a circuit diagram of a conventional optical sensor circuit, and Fig. 3 is a disturbance caused to the output signal of the optical sensor circuit of Fig. 2. FIG. 3 is a diagram for showing the influence of light. 11... Light receiving circuit (light receiving means 12 and load resistor 1
3), 12... Light receiving means (light receiving transistor), 13... Load resistor, 14... Signal converting means (low pass filter), 15... Comparing means (non-inverting amplifier), 16... Resistor, 17 ...Current mirror circuit, 18...First transistor (
PNP type transistor on the input side), 19...2nd
transistor (PNP type transistor on the output side), 31... light emitting means (light emitting diode).
Claims (1)
号光以外に、外乱光をも受光する受光手段が負荷
抵抗に直列接続されて成る受光回路と、この受光
回路の出力信号を直流電圧に変換する信号変換手
段と、この信号変換手段で変換された直流電圧を
所定の基準電圧と比較する比較手段と、この比較
手段の出力端に接続された抵抗と、この抵抗に直
列接続された第１のトランジスタ及び前記負荷抵
抗に並列接続された第２のトランジスタから成る
カレントミラー回路とを具備したことを特徴とす
る光センサ回路。 A light-receiving circuit comprising a light-receiving means connected in series to a load resistor, which receives disturbance light in addition to signal light from a light-emitting means that emits light in response to a pulse signal, and a signal that converts the output signal of this light-receiving circuit into a DC voltage. a converting means, a comparing means for comparing the DC voltage converted by the signal converting means with a predetermined reference voltage, a resistor connected to the output terminal of the comparing means, and a first transistor connected in series with the resistor. and a current mirror circuit including a second transistor connected in parallel to the load resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988041958U JPH01147533U (en) | 1988-03-31 | 1988-03-31 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988041958U JPH01147533U (en) | 1988-03-31 | 1988-03-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01147533U true JPH01147533U (en) | 1989-10-12 |
Family
ID=31268384
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988041958U Pending JPH01147533U (en) | 1988-03-31 | 1988-03-31 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01147533U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0432307A (en) * | 1990-05-29 | 1992-02-04 | Sharp Corp | Ac amplifier |
| JPH0666634A (en) * | 1992-08-19 | 1994-03-11 | Omron Corp | Photoelectric sensor |
-
1988
- 1988-03-31 JP JP1988041958U patent/JPH01147533U/ja active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0432307A (en) * | 1990-05-29 | 1992-02-04 | Sharp Corp | Ac amplifier |
| JPH0666634A (en) * | 1992-08-19 | 1994-03-11 | Omron Corp | Photoelectric sensor |
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