JPS5828635B2 - Detection signal processing circuit in photoelectric smoke detector - Google Patents
Detection signal processing circuit in photoelectric smoke detectorInfo
- Publication number
- JPS5828635B2 JPS5828635B2 JP51053489A JP5348976A JPS5828635B2 JP S5828635 B2 JPS5828635 B2 JP S5828635B2 JP 51053489 A JP51053489 A JP 51053489A JP 5348976 A JP5348976 A JP 5348976A JP S5828635 B2 JPS5828635 B2 JP S5828635B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- switching
- photoelectric smoke
- signal processing
- detection signal
- 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.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
- G08B17/103—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device
- G08B17/107—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device for detecting light-scattering due to smoke
Landscapes
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fire-Detection Mechanisms (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Description
【発明の詳細な説明】
本発明は光電式煙感知器において警報動作するまでの検
知信号処理回路に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a detection signal processing circuit for a photoelectric smoke detector until an alarm is activated.
煙粒子によって光の散乱現象を起して動作する光電式煙
感知器は、光、電気などに起因する外乱ノイズのような
突発的で、しかもエネルギーの大きいものに対してすぐ
に応答動作することがあり、これが誤報の原因となるの
で、煙による正常動作によるものか、又外乱ノイズによ
る誤動作によるものか、どちらの信号による動作か判別
する必要がある。Photoelectric smoke detectors operate by causing a light scattering phenomenon by smoke particles, and can respond immediately to sudden and high-energy disturbances such as disturbance noise caused by light or electricity. Since this causes false alarms, it is necessary to determine which signal is causing the operation, whether it is due to normal operation due to smoke or malfunction due to disturbance noise.
従来における光電式煙感知器は、このような判別動作は
、スレシホールドレベルだけで判別しているので、一瞬
でもスレシホールドレベルを越えるノイズがはいると誤
動作するおそれがあり、しかもこのようなパルス性の信
号出力に遅延動作をもたすのは困難であり、更に従来に
おける光電式煙感知器は、外乱光を完全にさえ切る構造
にする必要があるために、煙流天性が悪い等の欠点があ
る。Conventional photoelectric smoke detectors perform this type of discrimination using only the threshold level, so if there is noise that exceeds the threshold level even momentarily, there is a risk of malfunction. It is difficult to create a delay in the pulsed signal output, and furthermore, conventional photoelectric smoke detectors have a structure that completely cuts out ambient light, so they have poor smoke flow characteristics. There are drawbacks such as.
本発明に係る光電式煙感知器は、このような問題点に鑑
み、検知動作に判断期間を設けること、換言すれば遅延
動作をもたせて煙による本来の信号だけを通して信頼度
を向上させることを目的とするものである。In view of these problems, the photoelectric smoke detector according to the present invention provides a judgment period for the detection operation, in other words, it has a delayed operation to improve reliability by passing only the original signal caused by smoke. This is the purpose.
即ち、本発明は煙粒子によって光の散乱現象を起して動
作する光電式煙感知器において、動作レベルを検出する
レベル検出回路、動作レベルを保持するスイッチング回
路、スイッチングリセット回路、放電回路、ＣＲ時定数
回路及び出力回路で構成することを特徴とする光電式煙
感知器における検知信号処理回路に関するものである。That is, the present invention provides a photoelectric smoke sensor that operates by causing a light scattering phenomenon caused by smoke particles, which includes a level detection circuit that detects an operating level, a switching circuit that maintains the operating level, a switching reset circuit, a discharge circuit, and a CR. The present invention relates to a detection signal processing circuit in a photoelectric smoke detector, characterized by comprising a time constant circuit and an output circuit.
以下図面を参照し乍ら本発明に係る光電式煙感知器にお
ける検知信号処理回路を具体的に説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS A detection signal processing circuit in a photoelectric smoke detector according to the present invention will be specifically explained below with reference to the drawings.
１はレベル検出回路、２はスイッチング回路、３はスイ
ッチングリセット回路、４は放電回路、５はＣＲ時定数
回路、６は出力回路である。1 is a level detection circuit, 2 is a switching circuit, 3 is a switching reset circuit, 4 is a discharge circuit, 5 is a CR time constant circuit, and 6 is an output circuit.
（ＬＥＤ）は光源、（ＳＰＤ）は受光素子、Ａは発光パ
ルス発振回路、Ｂはリニヤアンプ、Ｑｌ乃至Ｑ７はスレ
シホールド、Ｒ１乃至Ｒ１’２は抵抗、Ｄｌ乃至Ｄ２は
ダイオード、Ｃ０はコンデンサ、Ｘ、Ｙは入力端、Ｚは
出力端である。(LED) is a light source, (SPD) is a light receiving element, A is a light emitting pulse oscillation circuit, B is a linear amplifier, Ql to Q7 are thresholds, R1 to R1'2 are resistors, Dl to D2 are diodes, C0 is a capacitor, X and Y are input ends, and Z is an output end.
次に本発明の動作状態について述べる。Next, the operating state of the present invention will be described.
入力端子Ｘに信号が低レベルでＶｃｃが供給されている
状態を考えると、スイッチング回路２がリセットしてお
り、コンデンサＣ１の電荷はスレシホールドＱ、によっ
て常時放電されておることになり、出力端Ｚの出力は零
■である。Considering the state where the signal is low level and Vcc is supplied to the input terminal The output at end Z is zero.
この状態ではスイッチング回路２は、発光パルスと常時
同期してスレシホールドＱ４により、リセット動作が繰
り返えされている。In this state, the switching circuit 2 is repeatedly reset by the threshold Q4 in constant synchronization with the light emission pulse.
入力にノイズが混入したときには、スレシホールドＱ１
によりスイッチング回路２がセットされ、スレシホール
ドＱ５は開放状態となって、抵抗Ｒ９、コンデンサＣ１
の時定数でコンデンサＣ１が充電されるが、次の発光パ
ルスによりスイッチング回路２がリセットして抵抗Ｒ８
、スレシホールドＱ、によりコンデンサＣ１の電荷が放
電されて元の状態に戻るのである。When noise is mixed into the input, the threshold Q1
The switching circuit 2 is set, the threshold Q5 becomes open, and the resistor R9 and capacitor C1
The capacitor C1 is charged with a time constant of , but the switching circuit 2 is reset by the next light emission pulse and the resistor R8
, threshold Q, the charge in the capacitor C1 is discharged and returns to its original state.
次ニ入力端ｘニスｖシホールトＱ１（ＶＢＩＥ：０．６
Ｖ）が常にパルス状に印加されると、スイッチング回路
２はセット状態を持続してスレシホールドＱ６゜Ｑ７Ｖ
ＢＥ（＝：＝１．２Ｖ）を越えたところで、コンデンサ
Ｃ１の電圧が出力端Ｚに発生する。Next input terminal x varnish v short Q1 (VBIE: 0.6
When V) is constantly applied in a pulsed manner, the switching circuit 2 maintains the set state and sets the threshold Q6゜Q7V.
When BE (=:=1.2V) is exceeded, the voltage of the capacitor C1 is generated at the output terminal Z.
こＸでコンデ゛ンサＣ１から出力をみたインピーダンス
は高いので、殆んど放電することなく、は’；Ｖｃｃま
で充電されるのである。Since the impedance of the output from capacitor C1 in this X is high, it is charged up to Vcc with almost no discharge.
この動作状態を、通常状態、ノイズ状態、警報状態とわ
けてタイムチャートで示すと第２図に示すようになる。This operating state is divided into a normal state, a noise state, and an alarm state and is shown in a time chart as shown in FIG.
本発明に係る光電式煙感知器における検知信号処理回路
は、煙粒子によって光の散乱現象を起して動作する光電
式煙感知器において、動作レベルを検出するレベル検出
回路、動作レベルを保持するスイッチング回路、スイッ
チングリセット回路、放電回路、ＣＲ時定数回路及び出
力回路で構成されているから、煙感知の時期時の消費電
力がなくなると共に、スイッチング回路によりリセット
されるまでの定常出力を出して煙以外の外乱ノイズに対
して誤動作しないようにでき、ＣＲ時定数回路により遅
延動作させて信号レベルを数回チェックすることによっ
て動作の信頼性を上げることができると共に、１瞬のパ
ルスでは動作せずに徴発の連続パルスが到来して始めて
動作することにより誤動作がなく、尚、一層信頼性を高
めることができるなど、すぐれた特長を有している。A detection signal processing circuit in a photoelectric smoke detector according to the present invention is a level detection circuit for detecting an operating level in a photoelectric smoke detector that operates by causing a light scattering phenomenon by smoke particles, and a level detecting circuit that maintains the operating level. It is composed of a switching circuit, a switching reset circuit, a discharge circuit, a CR time constant circuit, and an output circuit, so it eliminates power consumption during smoke detection, and also outputs a steady output until it is reset by the switching circuit to prevent smoke. It is possible to prevent malfunctions due to other disturbance noises, and the reliability of operation can be increased by delaying operation using a CR time constant circuit and checking the signal level several times, and it does not operate with a single instantaneous pulse. It has excellent features, such as being able to operate only after a series of commanded pulses arrive, eliminating malfunctions and further increasing reliability.
第１図は本発明に係る光電式煙感知器における検知信号
処理回路の電気回路図、第２図は同上の通常状態イ、ノ
イズ状態口、警報状態ハの動作状態を表わすタイムチャ
ート。
１はレベル検出回路、２はスイッチング回路、３はスイ
ッチングリセット回路、４は放電回路、５はＣＲ時定数
回路、６は出力回路である。
ＬＥＤは光源、ＳＰＤは受光素子、Ａは発光パルス発振
回路、Ｂはリニヤアンプ、Ｑｌ乃至Ｑ７はスレシホール
ド、Ｒ１乃至Ｒ１２は抵抗、Ｄｌ乃至Ｄ２はダイオード
、Ｃ１はコンデンサ、Ｘ、Ｙは入力端、Ｚは出力端。FIG. 1 is an electric circuit diagram of a detection signal processing circuit in a photoelectric smoke detector according to the present invention, and FIG. 2 is a time chart showing the operating states of normal state A, noise state A, and alarm state C. 1 is a level detection circuit, 2 is a switching circuit, 3 is a switching reset circuit, 4 is a discharge circuit, 5 is a CR time constant circuit, and 6 is an output circuit. LED is a light source, SPD is a light receiving element, A is a light emitting pulse oscillation circuit, B is a linear amplifier, Ql to Q7 are thresholds, R1 to R12 are resistors, Dl to D2 are diodes, C1 is a capacitor, X and Y are input terminals. , Z is the output end.
Claims (1)
式煙感知器において、動作レベルを検出するレベル検出
回路とレベル検出回路の出力で動作レベルを保持するス
イッチング回路とこのスイッチング回路を発光パルスに
よってリセットするスイッチングリセット回路とスイッ
チング回路がオンのとき充電しオフのとき放電する放電
回路とこの放電回路の充電時にＣＲ時定数回路によって
動作する出力回路で構成することを特徴とする光電式煙
感知器における検知信号処理回路。1 In a photoelectric smoke detector that operates by causing a light scattering phenomenon caused by smoke particles, there is a level detection circuit that detects the operating level, a switching circuit that maintains the operating level with the output of the level detection circuit, and a light emitting pulse that controls this switching circuit. A photoelectric smoke sensor comprising: a switching reset circuit that is reset by a switching reset circuit, a discharge circuit that charges when the switching circuit is on and discharges when the switching circuit is off, and an output circuit that operates by a CR time constant circuit when charging the discharge circuit. Detection signal processing circuit in the device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP51053489A JPS5828635B2 (en) | 1976-05-10 | 1976-05-10 | Detection signal processing circuit in photoelectric smoke detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP51053489A JPS5828635B2 (en) | 1976-05-10 | 1976-05-10 | Detection signal processing circuit in photoelectric smoke detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS52136678A JPS52136678A (en) | 1977-11-15 |
| JPS5828635B2 true JPS5828635B2 (en) | 1983-06-17 |
Family
ID=12944243
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP51053489A Expired JPS5828635B2 (en) | 1976-05-10 | 1976-05-10 | Detection signal processing circuit in photoelectric smoke detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5828635B2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS518983A (en) * | 1974-07-11 | 1976-01-24 | Omron Tateisi Electronics Co | FUNIKIKENCHISOCHI |
-
1976
- 1976-05-10 JP JP51053489A patent/JPS5828635B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS52136678A (en) | 1977-11-15 |
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