JPH01151394U - - Google Patents
Info
- Publication number
- JPH01151394U JPH01151394U JP4786088U JP4786088U JPH01151394U JP H01151394 U JPH01151394 U JP H01151394U JP 4786088 U JP4786088 U JP 4786088U JP 4786088 U JP4786088 U JP 4786088U JP H01151394 U JPH01151394 U JP H01151394U
- Authority
- JP
- Japan
- Prior art keywords
- light
- pulsed light
- transistor
- smoke
- circuit
- 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
- 239000003990 capacitor Substances 0.000 claims description 2
- 230000003321 amplification Effects 0.000 claims 5
- 238000003199 nucleic acid amplification method Methods 0.000 claims 5
- 239000000779 smoke Substances 0.000 claims 4
- 230000001360 synchronised effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
Description
第１図は本考案一実施例の回路図、第２図は同
上の動作説明図、第３図は従来例の回路図、第４
図は同上の動作説明図である。
１は発光回路、３は選択増幅回路、４は信号処
理回路、ＬＥＤは発光ダイオード、ＰＤはフオト
ダイオード、Ｑ１〜Ｑ３はトランジスタ、Ｃ３は
コンデンサ、Ｒ６，Ｒ７は抵抗である。
Fig. 1 is a circuit diagram of an embodiment of the present invention, Fig. 2 is an explanatory diagram of the same operation as above, Fig. 3 is a circuit diagram of a conventional example, and Fig. 4 is a circuit diagram of an embodiment of the present invention.
The figure is an explanatory diagram of the same operation as above. 1 is a light emitting circuit, 3 is a selection amplifier circuit, 4 is a signal processing circuit, LED is a light emitting diode, PD is a photodiode, Q 1 to Q 3 are transistors, C 3 is a capacitor, and R 6 and R 7 are resistors.
Claims (1)
ルス光を投光するとともに、煙によるパルス光の
反射光をフオトダイオードで受光し、選択増幅回
路にてフオトダイオード出力のパルス光に対応す
る部分を選択増幅し、信号処理回路にて選択増幅
回路出力に基いて煙の有無を判定するようにし、
選択増幅回路を増幅用の第１、第２トランジスタ
と、第２トランジスタのコレクタに挿入されパル
ス光に同期した光パルス信号にてオンされるスイ
ツチング用トランジスタとで形成した光電式煙感
知器において、エミツタ接地された増幅用の第２
トランジスタのコレクタ、エミツタ間にノイズ除
去用のコンデンサを接続するとともに、スイツチ
ング用トランジスタのベースに光パルス信号を抵
抗にて分圧した分圧信号を入力するようにしたこ
とを特徴とする光電式煙感知器。 Pulsed light is emitted from a light emitting diode controlled by a light emitting circuit, and the reflected light of the pulsed light from the smoke is received by a photodiode, and a selective amplification circuit selectively amplifies the portion of the photodiode output that corresponds to the pulsed light. The signal processing circuit determines the presence or absence of smoke based on the output of the selective amplification circuit.
In a photoelectric smoke detector in which a selective amplification circuit is formed of first and second transistors for amplification and a switching transistor inserted into the collector of the second transistor and turned on by a light pulse signal synchronized with pulsed light, The emitter is grounded for amplification.
A photoelectric smoke device characterized in that a capacitor for noise removal is connected between the collector and emitter of the transistor, and a divided voltage signal obtained by dividing the light pulse signal by a resistor is input to the base of the switching transistor. sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988047860U JP2503421Y2 (en) | 1988-04-08 | 1988-04-08 | Photoelectric smoke detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988047860U JP2503421Y2 (en) | 1988-04-08 | 1988-04-08 | Photoelectric smoke detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01151394U true JPH01151394U (en) | 1989-10-19 |
| JP2503421Y2 JP2503421Y2 (en) | 1996-07-03 |
Family
ID=31274037
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988047860U Expired - Lifetime JP2503421Y2 (en) | 1988-04-08 | 1988-04-08 | Photoelectric smoke detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2503421Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62197893A (en) * | 1986-02-26 | 1987-09-01 | 三洋電機株式会社 | Smoke sensor |
-
1988
- 1988-04-08 JP JP1988047860U patent/JP2503421Y2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62197893A (en) * | 1986-02-26 | 1987-09-01 | 三洋電機株式会社 | Smoke sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2503421Y2 (en) | 1996-07-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH01151394U (en) | ||
| JPH0469715U (en) | ||
| JPS59119646U (en) | photoelectric switch | |
| JPS5831270Y2 (en) | photoelectric smoke detector | |
| JPH01147533U (en) | ||
| JPH0216079U (en) | ||
| JPS62168528U (en) | ||
| JPS62141223U (en) | ||
| JPS6487U (en) | ||
| JPS59132247U (en) | photoelectric switch | |
| JPS63101880U (en) | ||
| JPH01172185U (en) | ||
| JPH044392U (en) | ||
| JPH0358795U (en) | ||
| JPS61180391U (en) | ||
| JPS61180392U (en) | ||
| JPH0455697U (en) | ||
| JPS59191683U (en) | alarm device | |
| JPS63161454U (en) | ||
| JPS6340829U (en) | ||
| JPS6178392U (en) | ||
| JPS61166641U (en) | ||
| JPH02123688U (en) | ||
| JPH01142885U (en) | ||
| JPS5866663U (en) | Laser diode light emission detection device |