JPH05332930A - Photoelectric separation type smoke detector - Google Patents
Photoelectric separation type smoke detectorInfo
- Publication number
- JPH05332930A JPH05332930A JP16172792A JP16172792A JPH05332930A JP H05332930 A JPH05332930 A JP H05332930A JP 16172792 A JP16172792 A JP 16172792A JP 16172792 A JP16172792 A JP 16172792A JP H05332930 A JPH05332930 A JP H05332930A
- Authority
- JP
- Japan
- Prior art keywords
- light
- monitoring
- fire
- light emitting
- polarization filter
- 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
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
- Fire-Detection Mechanisms (AREA)
Abstract
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 emits a light beam to a reflector plate arranged at a certain distance, receives the reflected light from the reflector plate, and the smoke received in the monitoring area causes the light reception level to be preset. The present invention relates to a photoelectric separation type smoke sensor that performs a sensing output when the threshold value is 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 Conventionally, the following is known as such a photoelectric type smoke detector. That is, a reflection plate is arranged on the optical axis of the light emitted from the light emitting unit, the light reflected by the reflection plate is received by the light receiving unit, and the light is blocked by the invasion of smoke, so that the light receiving level of the light receiving unit changes. Is detected, and a fire is judged based on the detected light receiving level.
【０００３】図８（ａ）に従来の光電式分離型煙感知器
の概略構成を示す。図８（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. 8A shows a schematic structure of a conventional photoelectric separation type smoke sensor. As can be seen from FIG. 8A, in the conventional photoelectric separation type smoke sensor, the light of the light emitting element 102 of the sensor main body 100 is collimated by the lens 104 and becomes a projection beam 106 which crosses the surveillance space. Then, the beam 107 whose direction is changed by 180 ° by the recursive mirror (reflecting plate) 101 is condensed by the light receiving lens 105 and received by the light receiving element 103. Here, if smoke 110 generated by a fire exists in the monitoring space, the beam is dimmed and received. For example, when a light reception signal of 100 mv is normally lowered to 50 mv, a fire signal is emitted.
【０００４】このような火災感知器にあっては、例えば
図８（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. 8B, when there is a shield 121 other than smoke in the monitoring area in the normal monitoring state, the light receiving output on the light receiving unit side. The fire may be accidentally detected because the fire drops. In such a case, a staff member goes out to the site where the fire detector is installed, confirms the presence of the shield, and removes the shield to return to the normal monitoring state. Further, in order to avoid such an unmonitored state due to the light being blocked by a shield, there is also a device that issues a trouble signal to call attention when the light reception signal becomes extremely small.
【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。By the way, in the above conventional photoelectric separation type smoke sensor, the shield 121 having a low reflectance is used.
In the case of shielding by the above method, if the light receiving level of the light receiving unit is lowered by the shielding object and the trouble detecting operation is performed, it is possible to deal with it by the above method for the time being. However, when the reflectance of the shield is high, the light from the light emitting portion is shielded by the shield 1.
There is a problem that the sensor determines that the light is normal because the light is reflected at 20 and returns to the light receiving portion. In that case, the shield 12
In the range from 0 to the reflector 101, there is a problem that monitoring becomes impossible and a false alarm is given.
【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。Further, this sensor is often installed near the ceiling of a building. However, in many cases pipes and ducts are arranged near the ceiling of the building, and when these are within the so-called limit radius, this sensor is effective to avoid false alarm 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。The present invention has been made in order to solve the above problems, and it is possible to accurately determine the presence of a shield other than smoke in the monitoring area, and even if there is a shield, its reflectance is high. Despite the above, it is an object of the present invention to provide a photoelectric separation type smoke sensor that can make an accurate fire judgment by canceling out the influence and obtaining the true amount of reflected light from the reflector.
【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生する火災監視用発光部と、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
記反射板前面に配された第１の偏光フィルタと、上記火
災監視用発光部前面に配された上記第１の偏光フィルタ
と同偏光面をもつ第２のフィルタと、上記火災監視用発
光部と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、該遮蔽物監視用発光部
前面に配された上記第１の偏光フィルタと９０°偏光面
のずれた第３の偏光フィルタを備え、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。In order to solve the above-mentioned conventional problems, the present invention according to claim 1 is directed to a fire-monitoring light-emitting portion which emits a light beam to a reflector plate arranged at a certain distance, and the reflection light-emitting portion. A photoelectric separating smoke detector comprising a light receiving portion for receiving the reflected light from the plate and a judging portion for making a sensing output when the light receiving output of the light receiving portion is less than or equal to a preset threshold value. A first polarizing filter disposed on the front surface of the fire monitoring light emitting section, a second filter having the same polarization plane as the first polarizing filter disposed on the front surface of the fire monitoring light emitting section, the fire monitoring light emitting section and the light receiving section. A shielding object monitoring light emitting unit for detecting the presence of a shielding object in the monitoring area, a first polarizing filter arranged on the front surface of the shielding object monitoring light emitting unit, and a third polarizing filter having a 90 ° polarization plane shift. Equipped with the above-mentioned fire monitoring light-emitting part and shield monitoring By intermittently lighting the light emitting part alternately, by comparing the amount of light received when the fire monitoring light emitting part is lit and the amount of light received when the shield monitoring light emitting part is lit, and by comparing the difference with the threshold value. It is configured to judge fire.
【０００９】また、請求項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光する発光部と、
該反射板からの反射光を受光する火災監視用受光部と、
該受講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、上記反射板前面に配された第１の偏光フィル
タと、上記火災監視用受光部前面に配された上記第１の
偏光フィルタと同偏光面をもつ第２の偏光フィルタと、
上記火災監視用発光部と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受光部と、該遮
蔽物監視用受光部前面に配された上記第１の偏光フィル
タと９０°偏光面のずれた第３の偏光フィルタを備え、
上記発光部を間欠点灯させ上記火災監視用受光部と遮蔽
物監視用受光部とにより交互に受光し、上記火災監視用
受光部受光時における受光量と上記遮蔽物監視用受光部
受光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。Further, according to the present invention of claim 2, a light emitting portion which emits a light beam to a reflecting plate arranged at a constant distance,
A fire monitoring light-receiving unit that receives the reflected light from the reflector,
In the photoelectric separation type smoke sensor, which comprises a judging unit for making a sensing output when the light receiving output of the learning unit is less than or equal to a preset threshold value, a first polarizing filter arranged on the front surface of the reflecting plate, A second polarizing filter having the same polarization plane as the first polarizing filter arranged on the front surface of the fire monitoring light receiving section;
A 90 ° polarized light with the shield monitoring light receiving unit that detects the presence of a shielding object in the monitoring region by the fire monitoring light emitting unit and the light receiving unit, the first polarizing filter arranged on the front surface of the shield monitoring light receiving unit, and 90 ° polarization. It is equipped with a third polarizing filter whose surface is offset,
The light emitting unit is turned on intermittently to alternately receive light by the light receiving unit for fire monitoring and the light receiving unit for shield monitoring, and the light receiving amount when receiving the light receiving unit for fire monitoring and the light receiving when receiving the light receiving unit for shield monitoring The fire is judged by comparing the quantity and comparing the difference with the threshold value.
【００１０】さらに、請求項３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光する発光部
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、上記反射板前面に配された第１の偏光フィルタと、
上記受光部または発光部いずれか一方の前面に回動自在
に配された第２の偏光フィルタとを備え、上記発光部を
間欠点灯させ、その点灯周期に同期して上記第２の偏光
フィルタを上記第１の偏光フィルタと第２の偏光フィル
タの偏光面が一致または９０°ずれるように９０°ずつ
回転させて、上記第１の偏光フィルタと第２の偏光フィ
ルタの偏光面が一致した場合と９０°ずれた場合との受
光量とを比較し、その差と上記閾値を比較することによ
り火災判断を行う構成、加えて請求項４の本発明は第２
の偏光フィルタをモータにより回転させる構成としてい
る。Further, according to the present invention of claim 3, a light emitting portion which emits a light beam to a reflecting plate arranged at a certain distance, a light receiving portion which receives reflected light from the reflecting plate, and the light receiving portion. In the photoelectric separation type smoke sensor including a determination unit that performs a detection output when the received light output of is less than or equal to a preset threshold value, a first polarization filter disposed on the front surface of the reflector,
A second polarization filter rotatably arranged on the front surface of either the light receiving unit or the light emitting unit, the light emitting unit is intermittently turned on, and the second polarization filter is turned on in synchronization with the lighting cycle. In the case where the polarization planes of the first polarization filter and the second polarization filter are rotated by 90 ° so that the polarization planes of the first polarization filter and the second polarization filter match or are shifted by 90 °, and the polarization planes of the first polarization filter and the second polarization filter match. A structure for making a fire judgment by comparing the amount of light received with a difference of 90 ° and comparing the difference with the threshold value. In addition, the present invention according to claim 4 is the second aspect.
The polarizing filter of is rotated by a motor.
【００１１】[0011]
【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 the photoelectric separated smoke detector of the present invention.
2 is a perspective view showing the overall configuration of the embodiment of FIG. As shown in FIG. 1, this photoelectric separation type smoke detector emits a light beam to a reflector plate 2 arranged at a certain distance from the detector body 1 and receives the reflected light from the reflector plate 2. Thus, when the received light output is less than or equal to a preset threshold value, a fire detection output is performed.
【００１２】本実施例は特に、偏光フィルタを用いて、
特定方向の偏光のみが反射板２から戻ってくるように
し、遮蔽物監視時においては通常の場合（煙も遮蔽物も
ない場合）は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に火災監視用発光素子１０と同一の遮蔽物監視用
発光素子３０及び受光素子１３を設け、さらに反射板２
の前面には第１の偏光フィルタ６１を、火災監視用発光
素子１０の前面には第２の偏光フィルタ６２を、遮蔽物
監視用発光素子３０の前面には第３の偏光フィルタ６３
を配した構成としている。In particular, this embodiment uses a polarizing filter to
Only the polarized light in a specific direction is returned from the reflection plate 2, and when the shield is monitored, the reflected light is not received normally (when there is no smoke or shield). The true reflected light amount by the reflection plate 2 is obtained based on the difference in the amount of light received when the shield is monitored, and the influence of the shield is removed. That is, as shown in FIG. 1, the sensor main body 1 is provided with the same shielding object monitoring light emitting element 30 and light receiving element 13 as the fire monitoring light emitting element 10, and further the reflector 2
Of the fire monitoring light emitting element 10, a second polarizing filter 62 on the front surface of the fire monitoring light emitting element 10, and a third polarizing filter 63 on the front surface of the shield monitoring light emitting element 30.
Is arranged.
【００１３】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、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と同一の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 structure of the sensor body 1 will be described.
FIG. 2 is a configuration block diagram showing the configuration of the sensor body 1. The sensor body 1 is roughly divided into a light emitting section 4, a light receiving section 5, and a judging section 6. First, the light emitting unit 4 includes a fire monitoring light emitting element 10 such as a light emitting diode that emits near infrared light, and a shield monitoring light emitting element 30 that is the same as the fire monitoring light emitting element 10, the fire monitoring light emitting element 10 and the shield. A light emission switching control unit 31 that switches the light emission of the object monitoring light emitting element 30, a switching control unit 32 that controls these switching, and a light emission switching control unit 3.
1, the light emission drive unit 11 for driving the fire monitoring light emitting element 10 and the shield monitoring light emitting element 30, the light emitting and receiving control unit 12 for controlling light emitting and light receiving operations, and the fire monitoring light emitting element 1
0 and a timer 33 for setting the switching time of the light-emitting element 30 for shielding the object, the light-emission cycle, and the like.
【００１４】次に、受光部５は、反射板２で反射した光
を受光する受光素子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１０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１
９とから構成されている。なお、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 receives the light reflected by the reflection plate 2, a light receiving element 13, an amplifier circuit 15 for amplifying the output from the light receiving element 13, and an analog signal from the amplifier circuit 15 as a digital signal. It is composed of an A / D converter 16 for converting the received light data. Further, the determination unit 6 switches the storage location of the received light data depending on whether the output of the light receiving element 13 is the light received from the fire monitoring light emitting element 10 or the light receiving from the shield monitoring light emitting element 30.
And a received light data storage unit 17 that stores received light data of light from the fire monitoring light emitting element 10, a received light data storage unit 37 that stores received light data of light from the shielding monitoring light emitting unit 30, and shields using both received light data A calculation unit 39 that calculates the amount of light reflected from an object, a threshold setting unit 18 that sets a threshold for fire detection in advance, and a fire determination unit 1 that makes a fire determination based on the threshold.
9 and 9. The light receiving data is switched by the changeover switch 34 at the same time 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.
【００１５】一方、本実施例においては火災監視用発光
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、その前面には先述のようにそれぞれ９０°偏光面
の異なる第２の偏光フィルタ６２と第３の偏光フィルタ
６３が設けられている。また、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。On the other hand, in this embodiment, a collimating lens 51 for collimating light is provided on the front surfaces of the fire monitoring light emitting element 10 and the shielding object monitoring light emitting element 30, and further, on the front surface thereof, as described above. A second polarizing filter 62 and a third polarizing filter 63 having different 90 ° planes of polarization are provided. Further, on the front surface of the light receiving element 13, a condenser lens 52 that condenses the reflected light from the reflection plate 2 is provided.
【００１６】また、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先述のように火災監
視用発光素子１０の前面に配された第２の偏光フィルタ
６２と同偏光面をもつの第１の偏光フィルタ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
られた光は、コリメートレンズ５１によりコリメートさ
れ、第２の偏光フィルタにより偏光とされる。ここで、
第１の偏光フィルタ６１と第２の偏光フィルタ６２が同
偏光面をもつためこの光は第１の偏光フィルタ６１を通
過して反射板２に達し、反射板２によって１８０°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から発せられた光
は、第３の偏光フィルタにより偏光面の方向が９０°ず
れているため反射板２に達することができず、受光部５
へは戻らない。A so-called recursive mirror is used for the reflection plate 2, and the front surface thereof has the same polarization plane as the second polarization filter 62 arranged on the front surface of the fire monitoring light emitting element 10 as described above. The first polarizing filter 61 having the above is provided. Therefore, the light emitted from the fire-monitoring light emitting element 10 is collimated by the collimator lens 51 and is polarized by the second polarizing filter. here,
Since the first polarization filter 61 and the second polarization filter 62 have the same polarization plane, this light passes through the first polarization filter 61 and reaches the reflection plate 2, and the direction is changed by 180 ° by the reflection plate 2 and the sensor is detected. It returns to the light receiving section 5 of the main body 1. However, the light emitted from the light emitting element 30 for monitoring the shield cannot reach the reflection plate 2 because the direction of the polarization plane is deviated by 90 ° by the third polarization filter, and the light receiving unit 5
I can't go back to.
【００１７】次に、上記のように構成される第１の実施
例の動作について説明する。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る。Next, the operation of the first embodiment configured as described above will be described. In the present embodiment, the fire monitoring light emitting element 10 and the shield monitoring light emitting element 30 are intermittently turned on alternately at a predetermined cycle.
【００１８】先述のように本実施例においては偏光フィ
ルタによる偏光面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。As described above, in this embodiment, only the light emitted from the fire monitoring light emitting element 10 returns from the reflecting plate 2 to the light receiving element 13 due to the difference in the polarization plane by the polarizing filter, and the shield monitoring light emitting element 30. The light emitted from is not received by the light receiving element 13.
【００１９】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から発せられた光は第２の偏光
フィルタ６２によりＡ方向の偏光となって反射板２へと
向う。この場合、反射板２の前面に配された第１の偏光
フィルタ６１もＡ方向偏光フィルタであることから火災
監視用発光素子１０からの光は反射板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
に受光される。That is, in the normal case, as shown in FIG.
The light emitted from the fire-monitoring light emitting element 10 is polarized in the A direction by the second polarization filter 62 and is directed to the reflection plate 2. In this case, since the first polarization filter 61 arranged on the front surface of the reflection plate 2 is also the A-direction polarization filter, the light from the fire monitoring light emitting element 10 reaches the reflection plate 2 and is incident due to the nature of the recursive mirror. Light receiving element 13 which is reflected in the direction of light
Is received by.
【００２０】一方、遮蔽物監視用発光素子３０から発せ
られた光は、第３の偏光フィルタ６３によりＢ方向の偏
光となって反射板２へと向う。この場合、第１の偏光フ
ィルタ６１はＡ方向の偏光フィルタであることからＢ方
向の偏光たる遮蔽物監視用発光素子３０からの光は反射
板２に達成しない。従って、通常の場合には図３（ａ）
に示すように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 emitted from the shielding object monitoring light emitting element 30 becomes polarized light in the B direction by the third polarization filter 63 and goes to the reflection plate 2. In this case, since the first polarization filter 61 is a polarization filter in the A direction, the light from the shielding object monitoring light emitting element 30 which is polarization in the B direction does not reach the reflection plate 2. Therefore, in the normal case, FIG.
As shown in, the light receiving element 13 receives light only when the fire monitoring light emitting element 10 emits light.
【００２１】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, consider a case where the shield 9 exists in the monitoring area as shown in FIG. In this case, the light emitted from both the light emitting elements 10 and 30 is applied to the shield 9 and is reflected by the shield 9. Then, the reflected light is incident on 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 reflected light from this shield from the received light amount.
【００２２】本発明においては、遮蔽物９は偏光の方向
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
における受光量は図３（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。一
方、遮蔽物監視用発光素子３０の発光時における受光量
は、反射板２からは反射光が来ないことにより遮蔽物９
からの反射光量のみとなる。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 the light from both the light emitting elements 10 and 30 regardless of the polarization direction. That is, when the shield 9 is present, the amount of light received when the fire monitoring light emitting element 10 emits light is as shown in FIG. 3B, the amount of reflected light from the reflector 2 and the amount of reflected light from the shield 9. Is the sum of On the other hand, the amount of light received by the shielding object monitoring light emitting element 30 when the shielding device 9 emits light is that the reflected light does not come from the reflecting plate 2,
It is only the amount of reflected light from. Therefore, the amount of light received from the shield 9 can be known from the amount of light received by the light emitting element 30 for monitoring the shield, and the difference between this and the amount of light received by the light emitting element 10 for fire monitoring can be obtained. Reflector 2
The true amount of received light from can be obtained.
【００２３】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１７，３
７からデータを読み込み、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。In the present embodiment, the above calculation is performed by the calculation unit 39 shown in FIG. That is, the received light data storage units 17, 3
Data is read from 7 and the true reflected light amount is obtained by taking the difference between them. Then, the fire determination unit 19 makes a fire determination by comparing the value with a threshold value preset in the threshold setting unit 18.
【００２４】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。なお、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。It should be noted that these series of calculations are carried out each time the light emitting elements 10 and 30 are intermittently turned on. That is,
Fire judgment is made by comparing with the immediately preceding data. Therefore, even if a new shield is added, the amount of light reflected by the shield changes, or the amount of light received decreases due to dirt on the lens, the effect is canceled out and an accurate fire judgment can be made. You can do it. Of course, when the reflected light from the shield is detected, a trouble signal may be emitted to notify the presence of the shield.
【００２５】次に、本発明に係る第２の実施例について
図４を用いて説明する。図４は、本発明に係る第２の実
施例の感知器本体１を示す斜視図である。本実施例の場
合には、先の実施例においては発光素子が２個設けられ
ていたのに対し、発光素子は一個とし、受光素子を火災
監視用受光素子５３、遮蔽物監視用受光素子５４の２個
設け、それぞれの受光素子の前面に第２の偏光フィルタ
７２とそれと９０°偏光面の異なる第３の偏光フィルタ
７３とを設けた構成となっている。なお、火災監視用受
光素子５３前面の第２の偏光フィルタ７２は反射板２前
面の第１の偏光フィルタ６１と同偏光面（Ａ方向）とな
っている。本実施例の感知器本体１の構成は、図２に示
す第１の実施例とほぼ同様の構成であり、図５に示すよ
うに第１の実施例とは受光素子１３に代りに受光素子が
火災監視用受光素子５３及び遮蔽物監視用受光素子５４
の２個設けられている点、発光素子は１個（発光素子５
０）のみである点が異なる。また、この場合発光切換制
御部３１の代わりに、受光切換制御部３１が設けられて
おり切換制御部３２の指令によりいずれの受光素子によ
って受光するか、そして受光データをいずれのデータ記
憶部に入力するかを切換える。Next, a second embodiment according to the present invention will be described with reference to FIG. FIG. 4 is a perspective view showing a sensor body 1 according to a second embodiment of the present invention. In the case of this embodiment, two light emitting elements are provided in the previous embodiment, but one light emitting element is provided, and the light receiving elements are the fire monitoring light receiving element 53 and the shielding object monitoring light receiving element 54. The second polarization filter 72 and the third polarization filter 73 having a 90 ° polarization plane different from that of the second polarization filter 72 are provided on the front surface of each light receiving element. The second polarization filter 72 on the front surface of the fire monitoring light receiving element 53 has the same polarization plane (direction A) as the first polarization filter 61 on the front surface of the reflector 2. The structure of the sensor main body 1 of this embodiment is almost the same as that of the first embodiment shown in FIG. 2, and as shown in FIG. 5, a light receiving element is used instead of the light receiving element 13 in the first embodiment. Is a light receiving element 53 for fire monitoring and a light receiving element 54 for shielding obstruction
The light emitting element is one (light emitting element 5
0) is the only difference. Further, in this case, instead of the light emission switching control unit 31, a light receiving switching control unit 31 is provided, which light receiving element receives light by a command of the switching control unit 32, and the light receiving data is input to any data storage unit. Switch whether to do.
【００２６】本実施例においては、発光素子５０は間欠
点灯する。そして、その点灯に同期して、その反射光を
受光する受光素子が切換えられる。この場合、発光素子
５０から発せられる無偏光の光は第１の偏光フィルタ６
１によりＡ方向に変更されて反射板２により反射され
る。従って、第１の実施例において述べた原理と同様
に、第１の偏光フィルタ６１と同偏光面をもつ第２の偏
光フィルタ６２の配された火災監視用受光素子５３には
反射板２からの反射光が入射する。一方、遮蔽物監視用
受光素子５４には、反射板２からの反射光は偏光方向
（Ｂ方向）が異なるため第３の偏光フィルタ７３により
カットされ入射しない。この場合の受光量の様子を図６
（ａ）に示す。In this embodiment, the light emitting element 50 is turned on intermittently. Then, in synchronization with the lighting, the light receiving element that receives the reflected light is switched. In this case, the unpolarized light emitted from the light emitting element 50 is the first polarization filter 6
It is changed to the A direction by 1 and reflected by the reflection plate 2. Therefore, similar to the principle described in the first embodiment, the fire monitoring light receiving element 53 in which the second polarizing filter 62 having the same polarization plane as the first polarizing filter 61 is arranged is provided from the reflecting plate 2. Reflected light enters. On the other hand, the reflected light from the reflection plate 2 has a different polarization direction (B direction) and is blocked by the third polarization filter 73 and does not enter the light receiving element 54 for monitoring an obstacle. FIG. 6 shows how the amount of received light in this case is.
It shows in (a).
【００２７】ここで、監視領域内に遮蔽物９が存在する
場合を考える。この場合、発光素子５０から発せられた
光は無偏光の光であり、従って、遮蔽物９からの反射光
も無偏光の光となる。このため、図６（ｂ）に示すよう
に火災監視用受光素子５３の受光時においては、反射板
２からの反射光と、遮蔽物９の反射光のＡ方向の成分が
受光されることになる。一方、遮蔽物監視用受光素子５
４の受光時においては、遮蔽物９の反射光のＢ方向の成
分が受光されることになる。ここで、遮蔽物９の反射光
は散乱光であり無偏光であることからそのＡ方向の成分
とＢ方向の成分は同じであると考えて良い。従って、火
災監視用受光素子５３の受光量と遮蔽物監視用受光素子
５４の受光量との差を求めることにより反射板２からの
真の反射光量が求まることになる。Here, consider a case where the shield 9 exists in the monitoring area. In this case, the light emitted from the light emitting element 50 is unpolarized light, and therefore the reflected light from the shield 9 is also unpolarized light. Therefore, as shown in FIG. 6B, when the fire monitoring light receiving element 53 receives light, the reflected light from the reflector 2 and the component in the A direction of the reflected light from the shield 9 are received. Become. On the other hand, the light-receiving element 5 for monitoring the shield
At the time of receiving light of No. 4, the component in the B direction of the reflected light of the shield 9 is received. Here, since the reflected light of the shield 9 is scattered light and not polarized, it can be considered that the component in the A direction and the component in the B direction are the same. Therefore, the true amount of reflected light from the reflector 2 is obtained by obtaining the difference between the amount of light received by the fire monitoring light receiving element 53 and the amount of light received by the shield monitoring light receiving element 54.
【００２８】なお、本実施例においてもこれらの演算は
第１の実施例と同様演算部３９において行い、その結果
に基づいて火災判断部１９が火災判断を行う。Also in this embodiment, these operations are performed by the operation unit 39 as in the first embodiment, and the fire determination unit 19 makes a fire determination based on the result.
【００２９】さらに、図７に本発明に係る第３の実施例
を示す。本実施例は、受発光素子を発光素子８１、受光
素子８２のそれぞれ１個とし、発光素子８１前面に第２
の偏光フィルタ８３を設けたものである。この第２の偏
光フィルタ８３は例えばステッピングモータ（図示せ
ず）により９０°ずつ回転し、反射板２の前面に設けら
れた第１の偏光フィルタ６３と火災監視時には同偏光面
に、そして遮蔽物監視時には９０°偏光面のずれた位置
に停止するようになっている。Further, FIG. 7 shows a third embodiment according to the present invention. In this embodiment, each of the light emitting and receiving elements is a light emitting element 81 and a light receiving element 82, and a second light emitting element is provided on the front surface of the light emitting element 81.
The polarizing filter 83 is provided. The second polarization filter 83 is rotated by 90 ° by a stepping motor (not shown), for example, and is placed on the same polarization plane as the first polarization filter 63 provided on the front surface of the reflection plate 2 at the time of fire monitoring, and a shield. At the time of monitoring, it is arranged to stop at a position where the plane of polarization is shifted by 90 °.
【００３０】本実施例においても感知器本体１の構成は
第１の実施例とほぼ同一であるが、発光素子が発光素子
８１の１個である点、発光切換制御部３１がなく切換制
御部３２により第２の偏光フィルタ８３と同期をとりつ
つ受光データの格納場所を切換える点が異なる。Also in this embodiment, the structure of the sensor body 1 is almost the same as that of the first embodiment, but the light emitting element is one of the light emitting elements 81, and there is no light emission switching control section 31 and the switching control section. 32 differs in that the storage location of the received light data is switched while synchronizing with the second polarization filter 83.
【００３１】本実施例において発光素子８１は第２の実
施例と同様に間欠点灯する。そして、その点灯に同期し
て第２の偏光フィルタ８３が回転し、受光データの格納
場所が切換えられる。この場合、火災監視時に第２の偏
光フィルタ８３の偏光方向がＡ方向の位置に停止してい
るときは第１の偏光フィルタ６３と同偏光面となり反射
板２からの反射光が受光素子８２により受光される。一
方、遮蔽物監視時に第２の偏光フィルタ８３が９０°回
転して停止すると偏光方向はＢ方向となり反射光は受光
されない。これらは先の実施例と同様の原理である。In this embodiment, the light emitting element 81 is intermittently turned on as in the second embodiment. Then, the second polarization filter 83 rotates in synchronization with the lighting, and the storage location of the received light data is switched. In this case, when the polarization direction of the second polarization filter 83 is stopped at the position of the A direction during fire monitoring, the polarization plane is the same as that of the first polarization filter 63 and the reflected light from the reflection plate 2 is reflected by the light receiving element 82. Received light. On the other hand, when the second polarization filter 83 is rotated by 90 ° and stopped during the monitoring of the shield, the polarization direction becomes the B direction, and the reflected light is not received. These are the same principles as in the previous embodiment.
【００３２】従って、先の実施例同様、監視領域内に遮
蔽物がある場合であっても火災監視量との差をとること
により、真の反射光量を求めることができることにな
る。Therefore, as in the previous embodiment, even if there is a shield in the monitoring area, the true reflected light amount can be obtained by calculating the difference from the fire monitoring amount.
【００３３】なお、本実施例においては発光素子８１の
前面に第２の偏光フィルタ８３を設けたが、受光素子８
２の前面に第２の偏光フィルタ８３を設けても良いのは
勿論である。Although the second polarization filter 83 is provided on the front surface of the light emitting element 81 in this embodiment, the light receiving element 8
It is needless to say that the second polarizing filter 83 may be provided on the front surface of 2.
【００３４】[0034]
【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、火災監視用、遮蔽物監視用の２個の発光部を設
け、それぞれに偏光面の異なる偏光フィルタを配し、さ
らに反射板前面に火災監視用発光部前面の偏光フィルタ
と同偏光面をもつ偏光フィルタを配する構成とし、これ
らの発光部を交互に間欠点灯させてその受光量に基づき
所定演算を行って遮蔽物による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
火災判断がなし得る。As described above, according to the present invention of claim 1, two light emitting portions for fire monitoring and for shielding object monitoring are provided, and polarizing filters having different polarization planes are arranged on the two light emitting portions, respectively. A polarizing filter with the same polarization plane as the front of the fire monitoring light emitting part is arranged on the front surface of the reflector, and these light emitting parts are alternately turned on and a predetermined calculation is performed based on the amount of light received to shield the object. There is an effect that the influence of the shield on the amount of received light can be canceled out by obtaining the amount of reflected light by, and the true amount of reflected light from the reflector can be obtained. As a result, accurate fire determination can be performed even when the shield is in the monitoring area.
In addition, when a fire judgment is made by comparing with the immediately preceding data, the number of shields newly increases, the amount of light reflected by the shield changes, or the amount of light received decreases due to dirt on the lens. Even if there is, the effect is offset. Therefore, even in such a case, an accurate fire judgment can be made.
【００３５】請求項２の本発明によれば、火災監視用の
２個の発光部を設け、それぞれに偏光面の異なる偏光フ
ィルタを配し、さらに反射板前面に火災監視用受光部前
面の偏光フィルタを配する構成とし、発光部を間欠点灯
させて上記の両受光部により交互に受光し、その受光量
に基づき所定演算を行って遮蔽物による反射光の量を求
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、先述と同様の効果もある。According to the second aspect of the present invention, two light emitting portions for fire monitoring are provided, and polarizing filters having different polarization planes are arranged on the two light emitting portions, respectively. The filter is arranged so that the light emitting section is turned on intermittently, the two light receiving sections receive light alternately, and a predetermined calculation is performed based on the amount of received light to obtain the amount of light reflected by the shield, thereby shielding against the amount of light received. The effects of the object can be canceled out, and the true amount of reflected light from the reflector can be obtained. As a result, accurate fire determination can be performed even when the shield is in the monitoring area. Also, by making a fire judgment by comparing with the immediately preceding data, the same effect as the above can be obtained.
【００３６】さらに、請求項３の本発明にあっては、発
光部又は受光部いずれか一方に回動自在な偏光フィルタ
を設ける構成とし、偏光フィルタを反射板前面の偏光フ
ィルタと同偏光面または９０°ずれた偏光面に交互に停
止させ発光を行うようにしたことにより、発光素子、受
光素子を従来同様１個ずつで遮蔽物の影響を相殺し、真
の反射光を求めることができるという効果がある。これ
により、より簡易な方法により遮蔽物の影響を排除で
き、さらに従来の装置をそのままに改良を加えるだけで
本発明の効果を達成し得る。Further, in the present invention of claim 3, a rotatable polarization filter is provided in either the light emitting part or the light receiving part, and the polarization filter is the same as the polarization filter in front of the reflection plate or By alternately stopping the polarization planes shifted by 90 ° and emitting light, one light emitting element and one light receiving element can cancel the influence of the shields one by one as in the conventional case, and the true reflected light can be obtained. effective. Thereby, the influence of the shield can be eliminated by a simpler method, and the effect of the present invention can be achieved only by improving the conventional device as it is.
【００３７】加えて、請求項４の本発明によれば、モー
タにより偏光フィルタを回転させることにより、より正
確な角度調整が簡単に行えるという効果がある。In addition, according to the present invention of claim 4, there is an effect that a more accurate angle adjustment can be easily performed by rotating the polarization filter by the motor.
【図１】本発明の第１の実施例による光電式分離型煙感
知器の全体構成を示す斜視図である。FIG. 1 is a perspective view showing an overall configuration of a photoelectric separation type smoke sensor according to a first embodiment of the present invention.
【図２】本発明の第１の実施例の光電式分離型煙感知器
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 body of the photoelectric separation type smoke sensor according to the first embodiment of the present invention.
【図３】本発明の第１の実施例の光電式分離型煙感知器
における受光量の様子を示す説明図である。FIG. 3 is an explanatory diagram showing a state of an amount of received light in the photoelectric separation type smoke sensor according to the first embodiment of the present invention.
【図４】本発明の第２の実施例による光電式分離型煙感
知器の感知器本体側の構成を示す斜視図である。FIG. 4 is a perspective view showing a configuration of a photoelectric body type smoke detector according to a second embodiment of the present invention on the side of a detector body.
【図５】本発明の第２の実施例の光電式分離型煙感知器
の感知器本体の構成ブロック図である。FIG. 5 is a configuration block diagram of a sensor body of a photoelectric separation type smoke sensor according to a second embodiment of the present invention.
【図６】本発明の第２の実施例の光電式分離型煙感知器
における受光量の様子を示す説明図である。FIG. 6 is an explanatory diagram showing the state of the amount of light received in the photoelectric separation type smoke sensor according to the second embodiment of the present invention.
【図７】本発明の第３の実施例による光電式分離型煙感
知器の感知器本体側の構成を示す斜視図である。FIG. 7 is a perspective view showing a configuration of a photoelectric body type smoke detector according to a third embodiment of the present invention on a detector body side.
【図８】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. 8 is an explanatory view showing an example of a conventional photoelectric separation type smoke sensor.
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 ３０ 遮蔽物監視用発光素子（遮蔽物監視用発光部） ３９ 演算部 ５０ 発光素子 ５３ 火災監視用受光素子（火災監視用受光部） ５４ 遮蔽物監視用受光素子（遮蔽物監視用受光部） ６１ 第１の偏光フィルタ ６２ 第２の偏光フィルタ ６３ 第３の偏光フィルタ ７２ 第２の偏光フィルタ ７３ 第３の偏光フィルタ ８１ 発光素子 ８２ 受光素子 ８３ 第２の偏光フィルタ 1 Sensor main body 2 Reflector 4 Light emitting part 5 Light receiving part 6 Judging part 9 Shielding object 10 Fire monitoring light emitting element (fire monitoring light emitting part) 13 Light receiving element 30 Shielding monitoring light emitting element (shielding object monitoring light emitting part) 39 Operation Unit 50 Light Emitting Element 53 Fire Monitoring Light-Receiving Element (Fire Monitoring Light-Receiving Section) 54 Shield Observing Light-Receiving Element (Shield Observing Light-Receiving Section) 61 First Polarizing Filter 62 Second Polarizing Filter 63 Third Polarizing filter 72 Second polarizing filter 73 Third polarizing filter 81 Light emitting element 82 Light receiving element 83 Second polarizing filter
Claims (4)
て光線を発生する火災監視用発光部と、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、 上記反射板前面に配された第１の偏光フィルタと、上記
火災監視用発光部前面に配された上記第１の偏光フィル
タと同偏光面をもつ第２の偏光フィルタと、上記火災監
視用発光部と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、該遮蔽物監視用
発光部前面に配された上記第１の偏光フィルタと９０°
偏光面のずれた第３の偏光フィルタを備え、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 fire-monitoring light-emitting portion that emits light rays to a reflector plate that is arranged at a fixed distance, a light-receiving portion that receives the reflected light from the reflector plate, and a light-receiving output of the light-receiving portion is previously set. A photoelectric separation type smoke detector including a determination unit that performs a detection output when the threshold value is less than or equal to a set threshold value. In the photoelectric separation type smoke detector, the first polarization filter is disposed on the front surface of the reflector and the front side is disposed on the front surface of the fire monitoring light emitting unit. A second polarization filter having the same plane of polarization as the first polarization filter, a shield monitoring light emitting unit that detects the presence of a shield object in the monitoring area by the fire monitoring light emitting unit and the light receiving unit, and 90 ° with the above-mentioned first polarizing filter arranged on the front surface of the light-emitting part for monitoring the shield
A third polarizing filter having a deviated polarization plane is provided, and the fire monitoring light emitting unit and the shield monitoring light emitting unit are alternately turned on, and the light receiving amount and the shield monitoring when the fire monitoring light emitting unit is turned on. Compare the amount of light received when the light emitting unit for
A photoelectric separation type smoke detector characterized by making a fire judgment by comparing the difference with the threshold value.
て光線を発光する発光部と、該反射板からの反射光を受
光する火災監視用受光部と、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、 上記反射板前面に配された第１の偏光フィルタと、上記
火災監視用受光部前面に配された上記第１の偏光フィル
タと同偏光面をもつ第２の偏光フィルタと、上記火災監
視用発光部と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受光部と、該遮蔽物監視用
受光部前面に配された上記第１の偏光フィルタと９０°
偏光面のずれた第３の偏光フィルタを備え、上記発光部
を間欠点灯させ上記火災監視用受光部と遮蔽物監視用受
光部とにより交互に受光し、上記火災監視用受光部受光
時における受光量と上記遮蔽物監視用受光部受光時にお
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。2. A light emitting section for emitting a light beam to a reflector arranged at a constant distance, a fire monitoring light receiving section for receiving reflected light from the reflector, and a light receiving output of the light receiving section in advance. In a photoelectric separation type smoke detector including a determination unit that performs a detection output when the threshold value is less than or equal to a set threshold value, a first polarization filter disposed on the front surface of the reflector and a front surface of the light receiving unit for fire monitoring are disposed. A second polarization filter having the same polarization plane as that of the first polarization filter, a shield monitoring light receiving unit that detects the presence of a shield object in a monitoring area by the fire monitoring light emitting unit and the light receiving unit, and 90 ° with the above-mentioned first polarization filter arranged on the front surface of the light-receiving unit for monitoring the shield
A third polarizing filter having a deviated polarization plane is provided, and the light emitting section is intermittently turned on to alternately receive light by the fire monitoring light receiving section and the shielding object monitoring light receiving section, and the light is received when the fire monitoring light receiving section receives light. A photoelectric separated smoke detector, characterized in that a fire judgment is made by comparing the amount of light received and the amount of light received at the time of receiving the light-receiving part for shielding, and comparing the difference with the threshold value.
て光線を発光する発光部と、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、 上記反射板前面に配された第１の偏光フィルタと、上記
受光部または発光部いずれか一方の前面に回動自在に配
された第２の偏光フィルタとを備え、上記発光部を間欠
点灯させ、その点灯周期に同期して上記第２の偏光フィ
ルタを上記第１の偏光フィルタと第２の偏光フィルタの
偏光面が一致または９０°ずれるように９０°ずつ回転
させて、上記第１の偏光フィルタと第２の偏光フィルタ
の偏光面が一致した場合と９０°ずれた場合との受光量
とを比較し、その差と上記閾値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。3. A light emitting section which emits a light beam to a reflecting plate arranged at a constant distance, a light receiving section which receives reflected light from the reflecting plate, and a threshold value for which a light receiving output of the light receiving section is preset. In a photoelectric separation type smoke sensor including a determination unit that performs a sensing output in the following cases, a first polarization filter arranged on the front surface of the reflector and one of the light receiving unit and the light emitting unit on the front surface are provided. A second polarization filter rotatably arranged, the light emitting unit is intermittently lit, and the second polarization filter is synchronized with the lighting cycle of the first polarization filter and the second polarization filter. 90 ° each so that their polarization planes coincide with each other or deviate from each other by 90 °, and compare the amount of light received when the polarization planes of the first polarization filter and the second polarization filter are coincident with each other and when they are deviated by 90 °. And compare the difference with the above threshold Photoelectric separated smoke sensor and performing a more fire decision.
て、上記第２の偏光フィルタをモータにより回転させる
ことを特徴とするもの。4. The photoelectric separated smoke detector according to claim 3, wherein the second polarization filter is rotated by a motor.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16172792A JP3196975B2 (en) | 1992-05-29 | 1992-05-29 | 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 |
|---|---|---|---|
| JP16172792A JP3196975B2 (en) | 1992-05-29 | 1992-05-29 | Photoelectric separated smoke detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05332930A true JPH05332930A (en) | 1993-12-17 |
| JP3196975B2 JP3196975B2 (en) | 2001-08-06 |
Family
ID=15740743
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16172792A Expired - Lifetime JP3196975B2 (en) | 1992-05-29 | 1992-05-29 | Photoelectric separated smoke detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3196975B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001118157A (en) * | 1999-10-20 | 2001-04-27 | Sogo Keibi Hosho Co Ltd | Composite-type sensor |
| WO2007139022A1 (en) * | 2006-05-26 | 2007-12-06 | Nalux Co., Ltd. | Infrared light source and its fabrication method |
| US8017923B2 (en) | 2006-05-26 | 2011-09-13 | Nalux Co., Ltd | Infrared source and method of manufacturing the same |
| CN107478552A (en) * | 2016-06-07 | 2017-12-15 | 宁波方太厨具有限公司 | Oil smoke concentration sensor and its oil smoke concentration detection apparatus and detection method |
-
1992
- 1992-05-29 JP JP16172792A patent/JP3196975B2/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001118157A (en) * | 1999-10-20 | 2001-04-27 | Sogo Keibi Hosho Co Ltd | Composite-type sensor |
| WO2007139022A1 (en) * | 2006-05-26 | 2007-12-06 | Nalux Co., Ltd. | Infrared light source and its fabrication method |
| US8017923B2 (en) | 2006-05-26 | 2011-09-13 | Nalux Co., Ltd | Infrared source and method of manufacturing the same |
| CN107478552A (en) * | 2016-06-07 | 2017-12-15 | 宁波方太厨具有限公司 | Oil smoke concentration sensor and its oil smoke concentration detection apparatus and detection method |
| CN107478552B (en) * | 2016-06-07 | 2023-09-15 | 宁波方太厨具有限公司 | Oil smoke concentration sensor and oil smoke concentration detection device and detection method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3196975B2 (en) | 2001-08-06 |
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