JP3093035B2 - Photoelectric separated smoke detector - Google Patents
Photoelectric separated smoke detectorInfo
- Publication number
- JP3093035B2 JP3093035B2 JP04173758A JP17375892A JP3093035B2 JP 3093035 B2 JP3093035 B2 JP 3093035B2 JP 04173758 A JP04173758 A JP 04173758A JP 17375892 A JP17375892 A JP 17375892A JP 3093035 B2 JP3093035 B2 JP 3093035B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- monitoring
- unit
- receiving
- fire
- 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 - Lifetime
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- Fire-Detection Mechanisms (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、一定距離を介して配置
した反射板に対して光線を発光し、反射板からの反射光
を受光し、監視領域内に侵入した煙により受光レベルが
予め設定した閾値以下となった場合に感知出力を行う光
電式分離型煙感知器に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light-emitting device which emits a light beam to a reflector disposed at a predetermined distance, receives reflected light from the reflector, and sets a light receiving level in advance by smoke entering a monitoring area. The present invention relates to a photoelectric separation type smoke detector that performs a sensing output when a value falls below a set threshold value.
【０００２】[0002]
【従来の技術】従来、このような光電式分離型煙感知器
としては、次のようなものが知られている。即ち、発光
部から発せられる光の光軸上に反射板を配置し、反射板
による反射光を受光部で受光し、煙の侵入によって光が
遮られることにより、受光部での受光レベルの変化を検
出し、その検出した受光レベルにより火災の判断を行う
ものである。2. Description of the Related Art Heretofore, the following is known as such a photoelectric separation type smoke detector. In other words, a reflection plate is arranged on the optical axis of the light emitted from the light-emitting unit, and the light reflected by the reflection plate is received by the light-receiving unit, and the light is blocked by the invasion of smoke. Is detected, and a fire is judged based on the detected light receiving level.
【０００３】図７（ａ）に従来の光電式分離型煙感知器
の概略構成を示す。図７（ａ）よりわかるように従来の
光電式分離型煙感知器においては、感知器本体１００の
発光素子１０２の光は、レンズ１０４によってコリメー
トされ投光ビーム１０６となって監視空間を横切る。そ
して、再帰ミラー（反射板）１０１により１８０°方向
転換したビーム１０７は、受光レンズ１０５で集光さ
れ、受光素子１０３で受光される。ここで、監視空間に
火災により発生した煙１１０が存在すれば、ビームが減
光されて受光される。例えば、通常１００mvの受光信号
が５０mvまで低下することで、火災信号を発するように
構成されていた。FIG. 7A shows a schematic configuration of a conventional photoelectric separation type smoke detector. As can be seen from FIG. 7 (a), in the conventional photoelectric separation type smoke detector, the light of the light emitting element 102 of the sensor main body 100 is collimated by the lens 104 and becomes a light projection beam 106 to traverse the monitoring space. Then, the beam 107 whose direction has been changed by 180 ° by the recursive mirror (reflection plate) 101 is condensed by the light receiving lens 105 and received by the light receiving element 103. Here, if smoke 110 generated by the fire exists in the monitoring space, the beam is dimmed and received. For example, a fire signal is generated when the light receiving signal of 100 mv is reduced to 50 mv.
【０００４】このような火災感知器にあっては、例えば
図７（ｂ）に示すように、通常監視状態で監視領域に煙
以外の遮蔽物１２１が存在する場合、受光部側での受光
出力が落込むことから誤って火災検出を行ってしまうこ
とがある。このような場合、係員が火災感知器を設置し
てある現場に出向き、遮蔽の存在を確認して遮蔽物を取
除くことにより通常の監視状態に戻るといった対処がな
されていた。また、このような光が遮蔽物で遮られるこ
とで無監視状態になるのを避けるために、受光信号が極
端に小さくなった場合にトラブル信号を発して注意を促
すようにしたものもある。In such a fire detector, for example, as shown in FIG. 7 (b), when a shield 121 other than smoke is present in the monitoring area in the normal monitoring state, the light receiving output on the light receiving section side is provided. Erroneous fire detection may occur due to dropping In such a case, a countermeasure has been taken to go to the site where the fire detector is installed, confirm the existence of the shield, remove the shield, and return to the normal monitoring state. In addition, in order to avoid such a situation that the light is not monitored and thus the light is not monitored, a trouble signal is issued when the light receiving signal becomes extremely small to call attention.
【０００５】[0005]
【発明が解決しようとする課題】ところで、上記従来の
光電式分離型煙感知器では、反射率の低い遮蔽物１２１
による遮蔽の場合には遮蔽物によって受光部の受光レベ
ルが低下しトラブル検出動作を行えば、上記した方法で
とりあえず対処することができる。しかしながら、遮蔽
物の反射率が高い場合には、発光部からの光が遮蔽物１
２０で反射して受光部に戻ることにより感知器では正常
と判断してしまう問題があった。その場合、遮蔽物１２
０と反射板１０１までの範囲においては監視が不能とな
り失報してしまうという問題があった。In the above-mentioned conventional photoelectric separation type smoke detector, the shield 121 having a low reflectance is used.
In the case of the shielding by the above method, if the light receiving level of the light receiving unit is reduced by the shielding object and the trouble detecting operation is performed, it is possible to cope with the above-described method. However, when the reflectance of the shield is high, the light from the light emitting unit is
There is a problem in that the light is reflected at 20 and returns to the light receiving section, so that the sensor determines that it is normal. In that case, the shield 12
In the range from 0 to the reflection plate 101, there is a problem that monitoring becomes impossible and a report is lost.
【０００６】また、本感知器は建物の天井近くに設置さ
れる場合も多い。しかしながら、建物の天井付近には配
管やダクト類が配されていることが多く、これらがいわ
ゆる限界半径内にある場合には、その反射光による失報
を避けるため、本感知器が有効であるにもかかわらず設
置できないという問題もあった。In many cases, the detector is installed near the ceiling of a building. However, pipes and ducts are often arranged near the ceiling of the building, and when these are within the so-called critical radius, this sensor is effective to avoid false alarms due to the reflected light Nevertheless, there was a problem that it could not be installed.
【０００７】本発明は、上記課題を解決するためになさ
れたものであり、監視領域における煙以外の遮蔽物の存
在を的確に判別でき、かつたとえ遮蔽物がある場合であ
ってもその反射率にかかわらずその影響を相殺して反射
板からの真の反射光量を求めることにより正確な火災判
断を行うことのできる光電式分離型煙感知器を提供する
ことを目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and it is possible to accurately determine the presence of a shield other than smoke in a monitoring area, and to reflect the reflectance even if a shield exists. Regardless of the above, an object of the present invention is to provide a photoelectric separation type smoke detector capable of making an accurate fire judgment by calculating the true reflected light amount from the reflection plate by canceling the influence.
【０００８】[0008]
【課題を解決するための手段】上記従来の課題を解決す
るため請求項１の本発明は、一定距離を介して配置した
反射板に対して光線を発する発光部と、該反射板からの
反射光を受光する受光部と、該受光部の受光出力が予め
設定した閾値以下の場合に感知出力を行う判断部を備え
てなる光電式分離型煙感知器において、上記発光部は、
予め定めた第１の波長の光線を発する火災監視用発光部
と、予め定めた第２の波長の光線を発し、該火災監視用
発光部と上記受光部による監視領域における遮蔽物体の
存在を検出する遮蔽物監視用発光部とからなり、上記反
射板前面に上記第１の波長の光線のみを透過するフィル
タを備え、上記火災監視用発光部と遮蔽物監視用発光部
とを交互に間欠点灯させ、上記火災監視用発光部点灯時
における受光量と上記遮蔽物監視用発光部点灯時におけ
る受光量とを比較し、その差と上記閾値とを比較するこ
とにより火災判断を行う構成としている。SUMMARY OF THE INVENTION In order to solve the above-mentioned conventional problems, a first aspect of the present invention is to provide a light emitting section which emits a light beam to a reflecting plate arranged at a fixed distance, and a light reflecting portion from the reflecting plate. In a light receiving unit that receives light, a photoelectric separation type smoke sensor including a determination unit that performs a sensing output when the light receiving output of the light receiving unit is equal to or less than a preset threshold value,
A fire monitoring light emitting unit that emits a light beam of a predetermined first wavelength and a fire monitoring light emitting unit that emits a light beam of a second predetermined wavelength detect the presence of a shielded object in a monitoring area by the fire monitoring light emitting unit and the light receiving unit. And a filter that transmits only the light of the first wavelength on the front surface of the reflector, and the fire monitoring light emitting unit and the shield monitoring light emitting unit are intermittently turned on alternately. Then, the amount of light received when the light emitting unit for fire monitoring is turned on is compared with the amount of light received when the light emitting unit for shielding monitoring is turned on, and the difference is compared with the threshold to make a fire judgment.
【０００９】また請求項第２の本発明は一定距離を介し
て配置した反射板に対して光線を発する発光部と、該反
射板からの反射光を受光する受光部と、該受光部の受光
出力が予め設定した閾値以下の場合に感知出力を行う判
断部を備えてなる光電式分離型煙感知器において、上記
受光部は、予め定めた第１の波長の光線のみを透過する
フィルターを備えた火災監視用受光部と、予め定めた第
２の波長の光線のみを透過するフィルターを備えた遮蔽
物監視用受光部とからなり、上記反射板前面に上記第１
の波長のみを透過するフィルターを設け、上記発光部は
第１と第２の波長を共に含んだ光線を発する発光部から
なり、火災監視用受光部と遮蔽物監視用受光部の受光量
とを比較し、その差と、上記閾値とを比較することによ
り火災判断を行う構成としている。According to a second aspect of the present invention, there is provided a light emitting section for emitting a light beam to a reflecting plate disposed at a fixed distance, a light receiving section for receiving light reflected from the reflecting plate, and a light receiving section for receiving the light from the light receiving section. In a photoelectric separation type smoke sensor including a determination unit that performs a sensing output when an output is equal to or less than a predetermined threshold, the light receiving unit includes a filter that transmits only a light beam having a predetermined first wavelength. A fire monitoring light receiving unit, and a shielding object monitoring light receiving unit provided with a filter that transmits only a light beam of a predetermined second wavelength.
And a light-emitting unit that emits a light beam including both the first and second wavelengths. The light-emitting unit emits light containing both the first and second wavelengths. Then, a fire judgment is made by comparing the difference with the threshold value.
【００１０】[0010]
【実施例】以下、本発明の実施例について図面を用いて
説明する。図１は本発明の光電式分離型煙感知器の第１
の実施例の全体構成を示す斜視図である。本光電式分離
型煙感知器は、図１に示すように感知器本体１から一定
距離を介して配置した反射板２に対して光線を発し、そ
の反射板２からの反射光を受光することにより、受光出
力が予め設定した閾値以下の場合に火災の感知出力を行
うものである。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of a photoelectric separation type smoke detector according to the present invention.
FIG. 3 is a perspective view showing the overall configuration of the example. As shown in FIG. 1, the photoelectric separation type smoke detector emits a light beam to a reflector 2 disposed at a certain distance from the sensor body 1 and receives reflected light from the reflector 2. Accordingly, when the light reception output is equal to or less than a preset threshold, a fire detection output is performed.
【００１１】本実施例は特に、特定の波長のみを透過す
る光学フィルタを用いて、特定波長の光のみが反射板２
から戻ってくるようにし、遮蔽物監視時においてはこの
光学フィルタの作用により通常の場合（煙も遮蔽物もな
い場合）は反射板２からの反射光を受光しない構成と
し、火災監視時における受光量と遮蔽物監視時における
受光量の差をもとに反射板２による真の反射光量を求め
遮蔽物による影響を取除くものである。即ち、図１に示
すように感知器本体１に、波長λ1 （第１の波長）の光
を発する火災監視用発光素子１０（火災監視用発光部）
と、これと同一発光強度、同一拡散性の波長λ2 （第２
の波長）の光を発する遮蔽物監視用発光素子３０（遮蔽
物監視用発光部）及び波長依存性の無い受光素子１３
（受光部）を設け、さらに反射板２の前面には波長λ1
の光のみを透過させるフィルタ６１を配した構成として
いる。In this embodiment, an optical filter that transmits only a specific wavelength is used.
The structure is such that the reflected light from the reflector 2 is not received in a normal case (when there is neither smoke nor a shield) due to the action of the optical filter when monitoring a shield, The true reflected light amount by the reflector 2 is obtained based on the difference between the light amount and the received light amount at the time of monitoring the shield, and the influence of the shield is removed. That is, as shown in FIG. 1, a fire monitoring light emitting element 10 (fire monitoring light emitting unit) that emits light of wavelength λ 1 (first wavelength) is provided on the sensor body 1.
And the wavelength λ 2 (the second
Object monitoring light emitting element 30 (shielding object monitoring light emitting unit) and light receiving element 13 having no wavelength dependency
(Light receiving section), and a wavelength λ 1
And a filter 61 that transmits only the light of the above.
【００１２】最初に感知器本体１の構成から説明する。
図２は、感知器本体１の構成を示す構成ブロック図であ
る。感知器本体１は、大きく発光部４，受光部５及び判
断部６とに大別される。先ず、発光部４は、波長λ1 の
近赤外光を発する発光ダイオード等の火災監視用発光素
子１０及び火災監視用発光素子１０と同一発光強度、同
一拡散性の波長λ2 の光を発する遮蔽物監視用発光素子
３０と、火災監視用発光素子１０及び遮蔽物監視用発光
素子３０の発光を切換える発光切換制御部３１、これら
の切換えを制御する切換制御部３２、発光切換制御部３
１を介して火災監視用発光素子１０及び遮蔽物監視用発
光素子３０を駆動する発光駆動部１１、発光と受光動作
の制御を行う受発光制御部１２、火災監視用発光素子１
０及び遮蔽物監視用発光素子３０の切換時間や発光周期
等を設定するタイマ３３とから構成されている。First, the configuration of the sensor main body 1 will be described.
FIG. 2 is a configuration block diagram illustrating the configuration of the sensor main body 1. The sensor body 1 is roughly divided into a light emitting unit 4, a light receiving unit 5, and a determination unit 6. First, the light emitting section 4 emits light having a wavelength λ 2 having the same light emission intensity and the same diffusivity as the fire monitoring light emitting element 10 such as a light emitting diode emitting a near-infrared light having a wavelength λ 1. A light emitting element 30 for monitoring a shielding object, a light emission switching control unit 31 for switching light emission of the light emitting element for fire monitoring 10 and light emission of the light emitting element 30 for shielding object, a switching control unit 32 for controlling these switching, and a light emission switching control unit 3
1, a light emitting drive unit 11 for driving the fire monitoring light emitting element 10 and the shielding object monitoring light emitting element 30, a light emitting and receiving control unit 12 for controlling light emitting and light receiving operations, and a fire monitoring light emitting element 1.
0 and a timer 33 for setting a switching time, a light emission cycle, and the like of the light emitting element 30 for monitoring the shield.
【００１３】次に、受光部５は、反射板２で反射した光
を受光する波長依存性の無い受光素子１３と、受光素子
１３からの出力を増幅する増幅回路１５、増幅回路１５
からのアナログ信号をデジタル信号の受光データに変換
するＡ／Ｄ変換部１６とから構成されている。また、判
断部６は、受光素子１３の出力を火災監視用発光素子１
０からの光の受光か遮蔽物監視用発光素子３０からの光
の受光かによりその受光データの格納場所を切換える切
換スイッチ３４と、火災監視用発光素子１０からの光の
受光データを蓄える受光データ記憶部１７、遮蔽物監視
用発光部３０からの光の受光データを蓄える受光データ
記憶部３７、両受光データを用いて遮蔽物からの反射光
量を演算する演算部３９、予め火災感知を行う閾値を設
定する閾値設定部１８、該閾値に基づいて火災判断を行
う火災判断部１９とから構成されている。この場合、切
換スイッチ３４による受光データの切換えは、切換制御
部３２が火災監視用発光素子１０と遮蔽物監視用発光素
子３０の発光を切換えるときに同時に行われる。Next, the light receiving section 5 includes a light receiving element 13 having no wavelength dependency for receiving the light reflected by the reflecting plate 2, an amplifier circuit 15 for amplifying an output from the light receiving element 13, and an amplifier circuit 15
And an A / D converter 16 for converting an analog signal from the A / D into light reception data of a digital signal. The judging unit 6 also outputs the output of the light receiving element 13 to the fire monitoring light emitting element 1.
A changeover switch 34 for switching the storage location of the received light data depending on whether the light is received from 0 or the light from the shielding object monitoring light emitting element 30, and the received light data for storing the light receiving data from the fire monitoring light emitting element 10. Storage unit 17, light reception data storage unit 37 for storing light reception data of light from shield monitoring light emitting unit 30, calculation unit 39 for calculating the amount of light reflected from the shield using both light reception data, threshold value for performing fire detection in advance And a fire determining unit 19 for making a fire determination based on the threshold. In this case, the switching of the received light data by the changeover switch 34 is performed simultaneously when the switching control unit 32 switches the light emission of the fire monitoring light emitting element 10 and the light emission of the shield monitoring light emitting element 30.
【００１４】なお、本実施例においては従来の光電式分
離型煙感知器と同様に、火災監視用発光素子１０及び遮
蔽物監視用発光素子３０の前面には、光をコリメートす
るコリメートレンズ５１が設けられ、さらに、受光素子
１３の前面には、反射板２からの反射光を集光する集光
レンズ５２が設けられている。In this embodiment, a collimating lens 51 for collimating light is provided on the front surface of the fire monitoring light emitting element 10 and the shielding object monitoring light emitting element 30 in the same manner as in the conventional photoelectric separation type smoke detector. Further, on the front surface of the light receiving element 13, a condensing lens 52 for condensing light reflected from the reflection plate 2 is provided.
【００１５】一方、反射板２には、いわゆる再帰性ミラ
ーが使用され、さらに、その前面には波長λ1 の光のみ
透過するフィルタ６１が設けられている。従って、火災
監視用発光素子１０から発せられた波長λ1 の光は、フ
ィルタ６１は波長λ1 の光は透過することからフィルタ
６１を通過して反射板２に達し、反射板２によって１８
０°方向を変え感知器本体１の受光部５へと戻ってく
る。しかしながら、遮蔽物監視用発光素子３０から発せ
られた波長λ2 の光は、フィルタ６１によりカットされ
反射板２に達することができず、受光部５へは戻らな
い。Meanwhile, the reflecting plate 2, so-called retro-mirror is used, further, a filter 61 which transmits only light of the wavelength lambda 1 is provided on its front face. Therefore, the light having the wavelength λ 1 emitted from the fire monitoring light emitting element 10 passes through the filter 61 and reaches the reflector 2 because the light having the wavelength λ 1 is transmitted through the filter 61, and the light having the wavelength λ 1 is reflected by the reflector 2.
The direction changes by 0 ° and returns to the light receiving section 5 of the sensor main body 1. However, the light of the wavelength λ 2 emitted from the shield monitoring light emitting element 30 is cut by the filter 61 and cannot reach the reflection plate 2, and does not return to the light receiving unit 5.
【００１６】次に、図３、４を用いて上記のように構成
される本発明に係る光電式分離型煙感知器の実施例の動
作について説明する。図３は、本発明の実施例の光電式
分離型煙感知器における受光パタ−ンを示す説明図、図
４は、同じくその受光量の様子を示す説明図である。本
実施例においては、火災監視用発光素子１０と、遮蔽物
監視用発光素子３０は所定周期をもって交互に間欠点灯
され、先述のように、通常の場合には波長の違いから火
災監視用発光素子１０から発せられた光のみが反射板２
から受光素子１３まで戻り、遮蔽物監視用発光素子３０
から発せられた光は受光素子１３には受光されない。Next, the operation of the embodiment of the photoelectric separation type smoke detector according to the present invention configured as described above will be described with reference to FIGS. FIG. 3 is an explanatory view showing a light receiving pattern in the photoelectric separation type smoke detector according to the embodiment of the present invention, and FIG. 4 is an explanatory view showing the state of the amount of received light. In this embodiment, the fire monitoring light emitting element 10 and the shielding object monitoring light emitting element 30 are intermittently turned on alternately at a predetermined cycle. Only the light emitted from 10 is the reflector 2
Back to the light receiving element 13, the shielding object monitoring light emitting element 30
Is not received by the light receiving element 13.
【００１７】即ち、通常の場合には図１に示すように、
火災監視用発光素子１０から発せられた波長λ1 の光は
コリメートレンズ５１によりコリメートされ反射板２へ
と向う。この場合、反射板２の前面に配されたフィルタ
６１は波長λ1 の光のみを透過するフィルタであること
から火災監視用発光素子１０からの波長λ1 の光は反射
板２に達し、再帰性ミラーの性質より入射光の方向に反
射され受光素子１３により受光される。That is, in a normal case, as shown in FIG.
The light of wavelength λ 1 emitted from the fire monitoring light emitting element 10 is collimated by the collimating lens 51 and travels to the reflector 2. In this case, the light of wavelength lambda 1 from fire monitoring light emitting element 10 since the filter 61 disposed in front of the reflector 2 is a filter that transmits only light of the wavelength lambda 1 reaches the reflective plate 2, recursion The light is reflected by the light receiving element 13 in the direction of the incident light due to the nature of the sex mirror.
【００１８】一方、遮蔽物監視用発光素子３０から発せ
られた波長λ2 の光も火災監視用発光素子１０から発せ
られた光と同様に反射板２へと向う。しかしながら、こ
の場合、フィルタ６１は波長λ1 の光のみを透過するフ
ィルタであることから波長λ2 の光たる遮蔽物監視用発
光素子３０からの光は反射板２に達しない。従って、通
常の場合には両素子１０，３０の交互発光により図３
（ａ）のような受光パタ−ンとなる。またこのときの受
光量の内訳は図４（ａ）に示すようになり、火災監視用
発光素子１０の発光時のみ受光素子１３に受光があるこ
とになる。On the other hand, the light having the wavelength λ 2 emitted from the shield monitoring light emitting element 30 also goes to the reflection plate 2 in the same manner as the light emitted from the fire monitoring light emitting element 10. However, in this case, since the filter 61 is a filter that transmits only the light of the wavelength λ 1 , the light from the shield monitoring light emitting element 30 that is the light of the wavelength λ 2 does not reach the reflector 2. Therefore, in the normal case, the light emission is alternately performed by the two elements 10 and 30 in FIG.
The light receiving pattern is as shown in FIG. The details of the received light amount at this time are as shown in FIG. 4A, and the light receiving element 13 receives light only when the fire monitoring light emitting element 10 emits light.
【００１９】ここで、監視領域内に図１に示すように遮
蔽物９が存在する場合を考える。この場合、遮蔽物９へ
は両発光素子１０，３０から発せられた光はこの遮蔽物
９に照射されかつ反射される。そして、その反射光は反
射板２からの反射光と共に受光素子１３に入射する。即
ち、正しい火災判断を行うためには、この遮蔽物からの
反射光を受光量から差し引いて判断を行う必要がある。Here, it is assumed that a shield 9 exists in the monitoring area as shown in FIG. In this case, the light emitted from the light emitting elements 10 and 30 is applied to the shield 9 and is reflected. Then, the reflected light enters the light receiving element 13 together with the reflected light from the reflection plate 2. That is, in order to make a correct fire judgment, it is necessary to make a judgment by subtracting the light reflected from the shield from the received light amount.
【００２０】本発明においては、遮蔽物９は波長に関係
なく両発光素子１０，３０からの光を反射することに着
目して反射光量を決定する。即ち、遮蔽物９が存在する
場合には、まず火災監視用発光素子１０の発光時におけ
る受光パタ−ンは図３（ｂ）に示すようになり、またそ
の受光量の内訳は図４（ｂ）に示すように反射板２から
の反射光量と遮蔽物９からの反射光量の和となる（波長
λ1 ）。一方、遮蔽物監視用発光素子３０の発光時に
は、両発光素子１０，３０が同一発光強度、同一拡散性
であること、遮蔽物９は波長に関係なく両発光素子１
０，３０からの光を反射すること、受光素子１３は波長
依存性を持たないこと、及び、反射板２からの反射光は
フィルタ６１の働きにより来ないことにより受光素子１
３の受光量の内訳は図４（ｂ）に示すように遮蔽物９か
らの反射光量のみとなる（波長λ2 ）。従って、遮蔽物
監視用発光素子３０の発光時の受光量により遮蔽物９か
らの反射光量を知ることができ、これと火災監視用発光
素子１０の発光時における受光量との差をとることによ
り反射板２からの真の受光量を求めることができる。In the present invention, the amount of reflected light is determined by paying attention to the fact that the shield 9 reflects light from both the light emitting elements 10 and 30 irrespective of the wavelength. That is, when the shield 9 is present, first, the light receiving pattern when the fire monitoring light emitting element 10 emits light is as shown in FIG. 3B, and the breakdown of the amount of received light is shown in FIG. ), The sum of the amount of light reflected from the reflector 2 and the amount of light reflected from the shield 9 (wavelength λ 1 ). On the other hand, when the light emitting element 30 for monitoring the shielding object emits light, the two light emitting elements 10 and 30 have the same emission intensity and the same diffusivity.
The light receiving element 1 reflects light from the light receiving elements 0 and 30, the light receiving element 13 has no wavelength dependency, and the light reflected from the reflecting plate 2 does not come from the function of the filter 61.
As shown in FIG. 4B, the received light amount of No. 3 is only the amount of reflected light from the shield 9 (wavelength λ 2 ). Therefore, the amount of light reflected from the shield 9 can be known from the amount of light received by the light emitting element 30 for monitoring the shield when the light is emitted, and the difference between this and the amount of light received by the light emitting element 10 for fire monitoring when the light is emitted is calculated. The true amount of light received from the reflector 2 can be determined.
【００２１】本実施例においては上記の演算は図２に示
す演算部３９が行う。即ち、受光データ記憶部１７から
火災監視用発光素子１０の発光時のデータを、また、受
光データ記憶部３７から遮蔽物監視用発光素子３０の発
光時のデータを読み込み、これらの差をとることにより
真の反射光量を得る。そして、火災判断部１９において
その値と閾値設定部１８に予め設定された閾値とを比較
することにより火災判断を行う。この時、従来の光電式
分離型煙感知器と同様、監視領域内に煙が存在する場合
には煙粒子による監視光の散乱のため受光素子１３の受
光量が低下することに鑑み、受光量を閾値と比較し受光
量が閾値以下の場合には火災信号を発する。In this embodiment, the above calculation is performed by the calculation unit 39 shown in FIG. That is, the data at the time of light emission of the fire monitoring light emitting element 10 is read from the light receiving data storage unit 17 and the data at the time of light emission of the shielding object monitoring light emitting element 30 are read from the light receiving data storage unit 37, and the difference between them is obtained. To obtain a true reflected light amount. Then, a fire judgment is made by comparing the value in the fire judgment unit 19 with a threshold value preset in the threshold value setting unit 18. At this time, similar to the conventional photoelectric separation type smoke detector, when smoke exists in the monitoring area, the amount of light received by the light receiving element 13 is reduced due to scattering of the monitoring light by smoke particles. Is compared with the threshold, and if the amount of received light is equal to or smaller than the threshold, a fire signal is issued.
【００２２】なお、これらの一連の演算は、各発光素子
１０，３０が間欠点灯するたび毎に実施される。即ち、
直前のデータとの比較を行うことにより火災判断を行
う。従って、遮蔽物が新たに増えた場合や、遮蔽物によ
る反射光量が変化した場合やレンズの汚れ等による受光
量の低下が生じた場合であっても、その影響は相殺され
正確な火災判断がなし得る。また、遮蔽物からの反射光
を検知した時にトラブル信号を発して遮蔽物の存在を知
らせるようにしてもよいことは勿論である。Note that these series of calculations are performed each time each of the light emitting elements 10 and 30 is turned on and off intermittently. That is,
A fire judgment is made by comparing with the immediately preceding data. Therefore, even if the number of shielding objects newly increases, if the amount of reflected light by the shielding objects changes, or if the amount of received light decreases due to contamination of the lens, the effects are offset and accurate fire judgment can be made. I can do it. Further, it is a matter of course that a trouble signal may be issued to detect the presence of the shield when detecting the reflected light from the shield.
【００２３】次に本発明の第２の実施例について図５、
６を用いて説明する。図５は第２の実施例の光電式分離
型煙感知器の全体構成を示す斜視図、図６はその感知器
本体の構成ブロック図である。第２実施例の構成を以下
説明すると、感知器本体１の受光部には、予め定めた第
１の波長λ1 の光線のみを透過するフィルター２５１を
備えた火災監視用受光部２１０と、予め定めた第２の波
長λ2 の光線のみを透過するフィルター３５１を備えた
遮蔽物監視用受光部２３０を設けている。それぞれには
波長λ1 、λ2の範囲ではその受光感度につき波長依存
性のない受光素子２５３、２５４が設けられている。ま
た、発光部２１３は第１と第２の波長を共に含んだ光線
を発するような発光素子２５０を備える。さらに、反射
板２前面には第１の波長λ1 のみを通過するフィルター
６１を設けている。そして火災の判断は、火災監視用受
光部２１０と遮蔽物監視用受光部２３０の受光量とを比
較し、その差と、予め設定した閾値とを比較する事によ
り火災判断を行う。Next, a second embodiment of the present invention will be described with reference to FIG.
6 will be described. FIG. 5 is a perspective view showing the overall configuration of the photoelectric separation type smoke detector of the second embodiment, and FIG. 6 is a block diagram showing the configuration of the main body of the sensor. The configuration of the second embodiment will be described below. The light receiving section of the sensor main body 1 includes a fire monitoring light receiving section 210 provided with a filter 251 that transmits only a light beam of a predetermined first wavelength λ 1. The shield monitoring light receiving unit 230 including the filter 351 that transmits only the light beam of the determined second wavelength λ 2 is provided. Light receiving elements 253 and 254 are provided in each of the wavelengths λ 1 and λ 2 , which do not have a wavelength dependency in light receiving sensitivity. In addition, the light emitting unit 213 includes a light emitting element 250 that emits a light beam including both the first and second wavelengths. Further, a filter 61 that passes only the first wavelength λ 1 is provided on the front surface of the reflection plate 2. Then, the fire is determined by comparing the amount of light received by the fire monitoring light receiving unit 210 with the light reception amount of the shield monitoring light receiving unit 230, and comparing the difference with a preset threshold.
【００２４】本実施例においては、まず発光部２１３は
第１と第２の波長λ1 、λ2 を共に含んだ光線を発す
る。ここで、反射板２前面には第１の波長λ1 のみを通
過するフィルター６１が設けられている。従って、反射
板２からの反射光は波長λ1 の光ということになる。即
ち、遮蔽物がない場合には、反射板２の反射光は波長λ
1 の光線のみを透過するフィルター２５１を備えた火災
監視用受光部２１０でのみ検知され、波長λ2 の光線の
みを透過するフィルター３５１を備えた遮蔽物監視用受
光部２３０では検知されない。一方、遮蔽物がある場合
には、遮蔽物からの反射光と反射板２からの反射光の両
方が感知器本体１に返ってくることになる。ここで、遮
蔽物からの反射光は、波長に関係なく反射され、波長λ
1 と波長λ2 の光を含んだ光線として感知器本体１に返
ってくる。従って、この光は火災監視用受光部２１０と
遮蔽物監視用受光部２３０との両方で検知されることに
なる。このため、火災監視用受光部２１０では遮蔽物か
らの反射光と反射板２からの反射光の両方が、遮蔽物監
視用受光部２３０では遮蔽物からの反射光のみが検知さ
れる。In this embodiment, first, the light emitting section 213 emits a light beam including both the first and second wavelengths λ 1 and λ 2 . Here, a filter 61 that passes only the first wavelength λ 1 is provided on the front surface of the reflection plate 2. Therefore, the light reflected from the reflection plate 2 is light having the wavelength λ 1 . That is, when there is no obstruction, the reflected light from the reflector 2 has a wavelength λ.
Only fire monitoring light receiving unit 210 having a filter 251 that transmits only one beam is detected, not detected in shield monitoring light-receiving unit 230 includes a filter 351 that transmits only light of the wavelength lambda 2. On the other hand, if there is a shield, both the reflected light from the shield and the reflected light from the reflector 2 return to the sensor body 1. Here, the reflected light from the shielding object is reflected regardless of the wavelength, and the wavelength λ
It returns to the detector main body 1 as a light beam containing light of wavelength 1 and wavelength λ 2 . Therefore, this light is detected by both the fire monitoring light receiving unit 210 and the shielding object monitoring light receiving unit 230. Therefore, both the reflected light from the shield and the reflected light from the reflector 2 are detected by the fire monitoring light receiving unit 210, and only the reflected light from the shield is detected by the shield monitoring light receiving unit 230.
【００２５】この場合、各受光部２１０、２３０はその
受光量に波長依存性はないことから、火災監視用受光部
２１０における遮蔽物からの反射光の受光量と遮蔽物監
視用受光部２３０におけるそれとは等しいと考えられ
る。従って、火災監視用受光部２１０における受光量と
遮蔽物監視用受光部２３０における受光量の差をとるこ
とによって反射板２からの真の受光量が求まることにな
る。そしてこれにより火災判断を行う。なお、この場合
においてもその他の処理等は第１の実施例と同様であ
る。In this case, since each of the light receiving sections 210 and 230 has no wavelength dependency in the light receiving amount, the light receiving amount of the reflected light from the shield in the fire monitoring light receiving section 210 and the light receiving amount in the shield monitoring light receiving section 230. It is considered equal. Therefore, the true amount of light received from the reflector 2 can be obtained by taking the difference between the amount of light received by the fire monitoring light receiving unit 210 and the amount of light received by the shielding object monitoring light receiving unit 230. Then, a fire judgment is made by this. In this case, other processes are the same as in the first embodiment.
【００２６】[0026]
【発明の効果】以上説明したように請求項１の本発明に
よれば、光電式分離型煙感知器の感知器本体にそれぞれ
波長の異なる火災監視用、遮蔽物監視用の２個の発光部
を設け、その一方で反射板前面に火災監視用発光部の光
のみ通すような特定波長の光のみを透過するフィルタを
配する構成とし、上記２発光部を交互に間欠点灯させて
その受光量に基づき所定演算を行い遮蔽物からの反射光
の量を求めることにより受光量に対する遮蔽物の影響を
相殺することができ、反射板からの真の反射光量を求め
ることができるという効果がある。これにより、遮蔽物
が監視領域内にある場合であっても正確な火災判断を行
うことができる。また、直前のデータとの比較により火
災判断を行うことにより、遮蔽物が新たに増えた場合
や、遮蔽物による反射光量が変化した場合やレンズの汚
れ等による受光量の低下が生じた場合であっても、その
影響が相殺されるという効果がある。従って、かかる場
合であっても正確な火災判断を行うことができる。As described above, according to the first aspect of the present invention, two light emitting units for monitoring fires and shields having different wavelengths are provided on the detector body of the photoelectric separation type smoke detector. And a filter that transmits only light of a specific wavelength that allows only the light of the fire monitoring light-emitting part to pass through is provided on the front surface of the reflector. The effect of the shield on the amount of light received can be canceled out by calculating the amount of light reflected from the shield by performing a predetermined calculation based on the above, and there is an effect that the true reflected light amount from the reflector can be obtained. Thus, accurate fire determination can be performed even when the shield is in the monitoring area. In addition, by performing a fire judgment by comparing with the immediately preceding data, when the number of shielding objects newly increases, when the amount of light reflected by the shielding object changes, or when the amount of received light decreases due to contamination of the lens, etc. Even so, the effect is that the effects are offset. Therefore, even in such a case, an accurate fire judgment can be made.
【００２７】また、請求項２の本発明によれば、火災監
視用、遮蔽物監視用の２個の受光部を設け、それぞれ波
長の異なる特定波長の光のみを透過するフィルタを配す
る構成とし、発光部を交互に間欠点灯させて各受光部の
受光量に基づき所定演算を行い遮蔽物からの反射光の量
を求めることにより受光量に対する遮蔽物の影響を相殺
することができ、反射板からの真の反射光量を求めるこ
とができるという効果があり、上記請求項１の発明と同
様正確な火災判断を行うことができる。According to the second aspect of the present invention, two light receiving units for monitoring fire and for monitoring a shield are provided, and a filter that transmits only light having a specific wavelength different from each other is provided. By intermittently turning on the light emitting units and performing a predetermined calculation based on the amount of light received by each light receiving unit to obtain the amount of reflected light from the shield, the effect of the shield on the amount of received light can be canceled out. There is an effect that a true reflected light amount from the object can be obtained, and an accurate fire judgment can be made in the same manner as in the first aspect of the invention.
【図１】本発明に係る光電式分離型煙感知器の第１の実
施例の全体構成を示す斜視図である。FIG. 1 is a perspective view showing the overall configuration of a first embodiment of a photoelectric separation type smoke detector according to the present invention.
【図２】本発明に係る光電式分離型煙感知器の第１の実
施例の感知器本体の構成ブロック図である。FIG. 2 is a configuration block diagram of a sensor main body of a first embodiment of a photoelectric separation type smoke detector according to the present invention.
【図３】本発明に係る光電式分離型煙感知器の第１の実
施例における受光パタ−ンの様子を示す説明図である。FIG. 3 is an explanatory diagram showing a light receiving pattern in the first embodiment of the photoelectric separation type smoke detector according to the present invention.
【図４】本発明に係る光電式分離型煙感知器の第１実施
例における受光量の様子を示す説明図である。FIG. 4 is an explanatory diagram showing the amount of light received in the first embodiment of the photoelectric separation type smoke detector according to the present invention.
【図５】本発明に係る光電式分離型煙感知器の第２の実
施例の全体構成を示す斜視図である。FIG. 5 is a perspective view showing the overall configuration of a second embodiment of the photoelectric separation type smoke detector according to the present invention.
【図６】本発明に係る光電式分離型煙感知器の第２の実
施例の感知器本体の構成ブロック図である。FIG. 6 is a configuration block diagram of a sensor main body of a second embodiment of the photoelectric separation type smoke detector according to the present invention.
【図７】従来の光電式分離型煙感知器の例を示す説明図
である。FIG. 7 is an explanatory diagram showing an example of a conventional photoelectric separation type smoke detector.
１ 感知器本体 ２ 反射板 ４ 発光部 ５ 受光部 ６ 判断部 ９ 遮蔽物 １０ 火災監視用発光素子（火災監視用発光部） １３ 受光素子（受光部） ３０ 遮蔽物監視用発光素子（遮蔽物監視用発光部） ３９ 演算部 ６１ フィルタ ２１０ 火災監視用受光部 ２１３ 発光部 ２３０ 遮蔽物監視用受光部 DESCRIPTION OF SYMBOLS 1 Sensor main body 2 Reflector 4 Light-emitting part 5 Light-receiving part 6 Judgment part 9 Shielding object 10 Light-emitting element for fire monitoring (fire-emitting light-emitting part) 13 Light-receiving element (light-receiving part) 30 Light-emitting element for shielding object monitoring (shielding object monitoring) Light-emitting part for 39) Operation part 61 Filter 210 Light-receiving part for fire monitoring 213 Light-emitting part 230 Light-receiving part for shielding object monitoring
フロントページの続き (56)参考文献 特開 昭63−184041（ＪＰ，Ａ) 特開 昭59−91340（ＪＰ，Ａ) 特開 平３−171399（ＪＰ，Ａ) 実開 昭63−143996（ＪＰ，Ｕ) 実開 昭57−99290（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) G08B 17/02 - 17/12 Continuation of the front page (56) References JP-A-63-184041 (JP, A) JP-A-59-91340 (JP, A) JP-A-3-171399 (JP, A) JP-A-63-143996 (JP) (U, U) Shokai Sho 57-99290 (JP, U) (58) Fields investigated (Int. Cl. 7 , DB name) G08B 17/02-17/12
Claims (2)
て光線を発する発光部と、該反射板からの反射光を受光
する受光部と、該受光部の受光出力が予め設定した閾値
以下の場合に感知出力を行う判断部を備えてなる光電式
分離型煙感知器において、 上記発光部は、予め定めた第１の波長の光線を発する火
災監視用発光部と、予め定めた第２の波長の光線を発
し、該火災監視用発光部と上記受光部による監視領域に
おける遮蔽物体の存在を検出する遮蔽物監視用発光部と
からなり、 上記反射板前面に上記第１の波長の光線のみを透過する
フィルタを備え、 上記火災監視用発光部と遮蔽物監視用発光部とを交互に
間欠点灯させ、上記火災監視用発光部点灯時における受
光量と上記遮蔽物監視用発光部点灯時における受光量と
を比較し、その差と上記閾値とを比較することにより火
災判断を行うことを特徴とする光電式分離型煙感知器。1. A light-emitting unit that emits light to a reflector disposed at a fixed distance, a light-receiving unit that receives light reflected from the reflector, and a light-receiving output of the light-receiving unit is equal to or less than a predetermined threshold. Wherein the light emitting unit comprises a fire monitoring light emitting unit that emits a light beam of a predetermined first wavelength, and a predetermined second light emitting unit. And a light-emitting part for detecting a fire, and a light-emitting part for detecting a presence of a shielded object in a monitoring area by the light-receiving part. The fire monitoring light emitting unit and the shielding object monitoring light emitting unit are intermittently turned on alternately, and the amount of light received when the fire monitoring light emitting unit is turned on and the light shielding unit monitoring light emitting unit is turned on And the difference between the A smoke detector for photoelectric separation, wherein a fire determination is made by comparing the threshold value with the above threshold value.
て光線を発する発光部と、該反射板からの反射光を受光
する受光部と、該受光出力が予め設定した閾値以下の場
合に感知出力を行う判断部を備えてなる光電式分離型煙
感知器において、 上記受光部は、予め定めた第１の波長の光線のみを透過
するフィルターを備えた火災監視用受光部と、予め定め
た第２の波長の光線のみを透過するフィルターを備えた
遮蔽物監視用受光部とからなり、上記反射板前面に上記
第１の波長のみを透過するフィルターを設け、上記発光
部は第１と第２の波長を共に含んだ光線を発する発光部
からなり、火災監視用受光部と遮蔽物監視用受光部の受
光量とを比較し、その差と、上記閾値とを比較すること
により火災判断を行うことを特徴とする光電式分離型煙
感知器。2. A light-emitting unit for emitting a light beam to a reflector disposed at a fixed distance, a light-receiving unit for receiving light reflected from the reflector, and a light-receiving unit for receiving light when the light-receiving output is equal to or less than a predetermined threshold value. In a photoelectric separation type smoke sensor including a determination unit that performs a sensing output, the light receiving unit includes a fire monitoring light receiving unit including a filter that transmits only a light beam of a predetermined first wavelength, and a predetermined light. A light-shielding part monitoring light-receiving unit provided with a filter that transmits only the light of the second wavelength, and a filter that transmits only the first wavelength is provided on the front surface of the reflector, and the light-emitting unit has a first and a second light. A light emitting unit that emits a light beam that includes the second wavelength is compared. The light receiving amount of the fire monitoring light receiving unit is compared with the light receiving amount of the shielding object monitoring light receiving unit, and the difference is compared with the threshold value to determine a fire. Photoelectric separation type smoke characterized by performing Intellectual instrument.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04173758A JP3093035B2 (en) | 1992-06-08 | 1992-06-08 | Photoelectric separated smoke detector |
| US08/066,909 US5502434A (en) | 1992-05-29 | 1993-05-21 | Smoke sensor |
| GB9310899A GB2267342B (en) | 1992-05-29 | 1993-05-26 | Smoke sensor |
| CH01602/93A CH689271A5 (en) | 1992-05-29 | 1993-05-27 | photoelectric smoke sensor. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04173758A JP3093035B2 (en) | 1992-06-08 | 1992-06-08 | Photoelectric separated smoke detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05342483A JPH05342483A (en) | 1993-12-24 |
| JP3093035B2 true JP3093035B2 (en) | 2000-10-03 |
Family
ID=15966598
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04173758A Expired - Lifetime JP3093035B2 (en) | 1992-05-29 | 1992-06-08 | Photoelectric separated smoke detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3093035B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR200479479Y1 (en) | 2015-11-20 | 2016-02-02 | 주신기업(주) | Scaffolding device for the roof |
-
1992
- 1992-06-08 JP JP04173758A patent/JP3093035B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR200479479Y1 (en) | 2015-11-20 | 2016-02-02 | 주신기업(주) | Scaffolding device for the roof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05342483A (en) | 1993-12-24 |
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