JPS6178392U - - Google Patents
Info
- Publication number
- JPS6178392U JPS6178392U JP16133784U JP16133784U JPS6178392U JP S6178392 U JPS6178392 U JP S6178392U JP 16133784 U JP16133784 U JP 16133784U JP 16133784 U JP16133784 U JP 16133784U JP S6178392 U JPS6178392 U JP S6178392U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- transistor
- output
- power supply
- collector
- 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
- 238000001514 detection method Methods 0.000 claims 3
- 239000000779 smoke Substances 0.000 claims 3
- 230000010354 integration Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 6
Landscapes
- Fire-Detection Mechanisms (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Description
第１図は本考案一実施例の回路図、第２図は同
上の要部回路図、第３図は同上の動作説明図、第
４図は従来例の回路図、第５図は同上の要部回路
図である。
１は投光手段、１ａは投光素子、２は受光手段
、２ａは受光素子、３は積分回路、４はレベル判
別回路、６は定電圧回路、７は出力回路、８は信
号線、ＺＤ２はツエナーダイオード、Ｑ３，Ｑ４
はトランジスタ、Ｒ３〜Ｒ７は抵抗、Ｖｃは回路
電源である。
Fig. 1 is a circuit diagram of an embodiment of the present invention, Fig. 2 is a circuit diagram of the same essential parts, Fig. 3 is an explanatory diagram of the same operation, Fig. 4 is a circuit diagram of a conventional example, and Fig. 5 is a circuit diagram of the same as above. It is a main part circuit diagram. 1 is a light projecting means, 1a is a light projecting element, 2 is a light receiving means, 2a is a light receiving element, 3 is an integrating circuit, 4 is a level discrimination circuit, 6 is a constant voltage circuit, 7 is an output circuit, 8 is a signal line, ZD 2 is a Zener diode, Q 3 , Q 4
is a transistor, R3 to R7 are resistors, and Vc is a circuit power supply.
Claims (1)
投光手段と、上記パルス光を受光素子にて受光増
幅するとともにレベル判別して煙によるレベル変
化があつたときにパルス光に対応した検知パルス
を出力する受光手段と、受光手段出力を積分する
積分回路と、積分回路出力のレベルを判別して所
定個数の検知パルスが得られたときに煙検出信号
を出力するレベル判別回路と、煙検出信号により
所定の直流電圧が印加された信号線間をツエナー
ダイオードを介して短絡する出力回路と、信号線
間の電圧を定電圧化して回路電源を形成する定電
圧回路とよりなる光電式煙感知器において、エミ
ツタが共通接続された２個のトランジスタのエミ
ツタをエミツタ抵抗を介して回路電源の一端に接
続し、一方のトランジスタのコレクタを回路電源
の他側に接続するとともに他方のトランジスタの
コレクタをコレクタ抵抗を介して回路電源の他端
に接続し、一方のトランジスタのベースに回路電
源を分圧抵抗にて分圧した基準電圧を印加すると
ともに、他方のトランジスタのベースに積分回路
出力を印加してレベル判別回路を形成し、一方の
トランジスタのベースに他方のトランジスタのコ
レクタ出力を帰還用抵抗を介して接続してヒステ
リシス回路を形成し、他方のトランジスタのコレ
クタ出力にて上記出力回路を制御したことを特徴
とする光電式煙感知器。 A light emitting means that emits pulsed light by driving a light emitting element in pulses, and a light receiving element that receives and amplifies the pulsed light, determines the level, and detects when the level changes due to smoke in response to the pulsed light. a light receiving means that outputs a pulse; an integrating circuit that integrates the output of the light receiving means; a level determining circuit that determines the level of the integrating circuit output and outputs a smoke detection signal when a predetermined number of detection pulses are obtained; A photoelectric smoker consisting of an output circuit that short-circuits signal lines to which a predetermined DC voltage is applied based on a detection signal via a Zener diode, and a constant voltage circuit that constant voltages the voltage between the signal lines to form a circuit power supply. In a sensor, the emitters of two transistors whose emitters are commonly connected are connected to one end of a circuit power supply via an emitter resistor, the collector of one transistor is connected to the other side of the circuit power supply, and the collector of the other transistor is connected to the other end of the circuit power supply. is connected to the other end of the circuit power supply via the collector resistor, and a reference voltage obtained by dividing the circuit power supply by a voltage dividing resistor is applied to the base of one transistor, and the integration circuit output is applied to the base of the other transistor. to form a level discrimination circuit, connect the collector output of the other transistor to the base of one transistor via a feedback resistor to form a hysteresis circuit, and control the above output circuit with the collector output of the other transistor. A photoelectric smoke detector that is characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16133784U JPH0449752Y2 (en) | 1984-10-25 | 1984-10-25 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16133784U JPH0449752Y2 (en) | 1984-10-25 | 1984-10-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6178392U true JPS6178392U (en) | 1986-05-26 |
| JPH0449752Y2 JPH0449752Y2 (en) | 1992-11-24 |
Family
ID=30719242
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16133784U Expired JPH0449752Y2 (en) | 1984-10-25 | 1984-10-25 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0449752Y2 (en) |
-
1984
- 1984-10-25 JP JP16133784U patent/JPH0449752Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0449752Y2 (en) | 1992-11-24 |
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