JPH09161176A - Photoelectric type smoke detector - Google Patents

Photoelectric type smoke detector

Info

Publication number
JPH09161176A
JPH09161176A JP32536395A JP32536395A JPH09161176A JP H09161176 A JPH09161176 A JP H09161176A JP 32536395 A JP32536395 A JP 32536395A JP 32536395 A JP32536395 A JP 32536395A JP H09161176 A JPH09161176 A JP H09161176A
Authority
JP
Japan
Prior art keywords
light
light emitting
emitting element
light receiving
smoke detector
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.)
Pending
Application number
JP32536395A
Other languages
Japanese (ja)
Inventor
Tetsuya Nagashima
哲也 長島
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hochiki Corp
Original Assignee
Hochiki Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hochiki Corp filed Critical Hochiki Corp
Priority to JP32536395A priority Critical patent/JPH09161176A/en
Publication of JPH09161176A publication Critical patent/JPH09161176A/en
Pending legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To prevent malfunction by providing a diffuser diffusing light emitting beam in front of a light emitting element so as to prevent the fluctuation of a light quantity reaching the light emitting element even at the time of generating dew condensation. SOLUTION: At a light sending part 5, the light emitting element 7 emits beams consisting of light emitting diode, e.g. The light emitting element 7 is driven by a light sending part 8, which pulse-drives the light emitting element 7 at prescribed time intervals, e.g. A wide angle lens 9 diffuses the light emitting beams of the light emitting element 7 to form a wide angle to uniform beams. In addition a light receiving part 6 is provided by separating at a short distance from the light sending part 5 and a condenser lens 10 converges the diffused light emitting beam and to output to a light receiving element 11. The light receiving element 11 consists of light receiving element, e.g. receives the light emitting beam converged by the light condenser lens 10, photoelectrically converts it and outputs it to the light receiving element 11. A light receiving circuit 12 amplifies an electric signal from the light receiving element 11 and when a light receiving quantity becomes not more than a fixed value, the circuit 12 outputs a fire detection signal.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明は、送光部と受光部が
1〜2m以下と比較的近接して配置されている光電式煙
感知器に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photoelectric smoke detector in which a light transmitting portion and a light receiving portion are arranged relatively close to each other by 1 to 2 m or less.

【0002】[0002]

【従来の技術】従来の光電式煙感知器としては、例えば
発光素子を有する送光部と受光素子を有する受光部を分
離して配置し、その間の煙による発光ビームの減衰を検
出して火災を感知するものがある。発光ビームの減衰量
は、監視光路長により大きく変化する。例えば監視距離
50mの一般の光電式分離型煙感知器に減光率15%/
mの煙が流入した場合においては、受光量が、ほぼゼロ
(正確には0.03%)まで落ちる。すなわち、通常監
視時の光電変換した電流を100mアンペアとすると、
電流がゼロアンペアになる。
2. Description of the Related Art As a conventional photoelectric smoke detector, for example, a light-transmitting section having a light-emitting element and a light-receiving section having a light-receiving element are separately arranged, and a light emission beam attenuation caused by smoke between them is detected to cause a fire. There is something that senses. The amount of attenuation of the emission beam changes greatly depending on the monitoring optical path length. For example, a general photoelectric separation type smoke sensor with a monitoring distance of 50 m has a dimming rate of 15% /
When m of smoke flows in, the amount of received light drops to almost zero (correctly 0.03%). That is, assuming that the photoelectrically converted current during normal monitoring is 100 mAmps,
The current goes to zero amps.

【0003】これに対して、監視光路長が50cmと短
い小型の光電式煙感知器においては、減光率が同じく1
5%/mとすると、受光量が例えば7.8%変化したこ
とを判別して動作しなければならない。すなわち、小型
の光電式煙感知器にあっては、光電変換した電流が9
2.2mアンペアになると発報するように構成しなけれ
ばならない。このように小型の光電式煙感知器にあって
は、煙による信号変化量が小さくなっている。
On the other hand, in a small photoelectric smoke detector having a short monitoring optical path length of 50 cm, the dimming rate is 1%.
If it is 5% / m, it is necessary to determine that the amount of received light has changed by 7.8%, for example, and operate. That is, in a small photoelectric smoke sensor, the photoelectrically converted current is 9
It must be configured to alert at 2.2 mamps. In such a small photoelectric smoke detector, the amount of signal change due to smoke is small.

【0004】[0004]

【発明が解決しようとする課題】しかしながら、このよ
うな従来の光路長が比較的短い小型の光電式煙感知器に
あっては、煙による信号変化量が小さいことから、結露
などによる信号量変化により容易に誤作動してしまうと
いう問題があった。即ち、結露による受光量の変化は、
光路長が短いほど影響が大きい。例えば図4に示すよう
に、レンズ径が5mm、光路長が50cm、ビーム半値
角が2.5度の従来の小型の光電式煙感知器において
は、49%も受光量が減少してしまう。このため発報受
光量7.8%変化を大きく上回り、容易に誤作動してし
まう。
However, in such a conventional compact photoelectric smoke detector having a relatively short optical path length, the signal change amount due to smoke is small, and therefore the signal amount change due to dew condensation or the like. Therefore, there is a problem in that it easily malfunctions. That is, the change in the amount of light received due to dew condensation is
The shorter the optical path length, the greater the effect. For example, as shown in FIG. 4, in a conventional small photoelectric smoke detector having a lens diameter of 5 mm, an optical path length of 50 cm, and a beam half-value angle of 2.5 degrees, the amount of received light is reduced by 49%. For this reason, it greatly exceeds the 7.8% change in the amount of reported light received, and a malfunction easily occurs.

【0005】本発明は、このような従来の問題に鑑みて
なされたものであって、発光素子からの発光ビームを拡
散させて結露などが発生した場合でも受光素子に到達す
る光量が変動しないようにすることで、誤動作を未然に
防止することができる光電式煙感知器を提供することを
目的とする。
The present invention has been made in view of such a conventional problem, and prevents the amount of light reaching the light receiving element from fluctuating even when the light emitting beam from the light emitting element is diffused to cause dew condensation. It is an object of the present invention to provide a photoelectric smoke detector that can prevent malfunctions in advance.

【0006】[0006]

【課題を解決するための手段】この目的を達成するため
に、本発明は次のように構成する。まず、本発明は、発
光素子を有する送光部と、受光素子を有する受光部を所
定の近距離だけ分離して配置しその間の煙による光の減
衰を検出する光電式煙感知器を対象とする。
In order to achieve the above object, the present invention is configured as follows. First, the present invention is directed to a photoelectric smoke detector for detecting a light attenuation due to smoke between a light-transmitting unit having a light-emitting element and a light-receiving unit having a light-receiving element separated by a predetermined short distance. To do.

【0007】このような光電式煙感知器につき本発明
は、発光素子の前方に、発光素子が発光する発光ビーム
を拡散させる拡散体を設けたことを特徴とする。本発明
においては、拡散体として広角レンズを用いる。また、
本発明においては、広角レンズとして凹レンズを用い
る。更に、本発明においては、拡散体として拡散板を用
いる。さらに、本発明においては、拡散体の代りに発光
素子の指向角を広くしても良い。
With respect to such a photoelectric smoke detector, the present invention is characterized in that a diffuser for diffusing a light emission beam emitted by the light emitting element is provided in front of the light emitting element. In the present invention, a wide-angle lens is used as the diffuser. Also,
In the present invention, a concave lens is used as the wide-angle lens. Further, in the present invention, a diffuser plate is used as the diffuser. Further, in the present invention, the directivity angle of the light emitting element may be widened instead of the diffuser.

【0008】このような構成を備えた本発明の光電式煙
感知器によれば、発光素子の前方に、発光素子が発光す
る発光ビームを拡散させる拡散体を設けたので、結露に
より発光ビームが乱された際にも受光部に到達する光量
に変化がなく、結露による誤作動を未然に防止すること
ができる。また、結露による誤作動を防止することがで
きるので、小型化を図ることができる。
According to the photoelectric smoke detector of the present invention having such a structure, since the diffuser for diffusing the emission beam emitted by the light emitting element is provided in front of the light emitting element, the emission beam is generated by the dew condensation. Even when disturbed, there is no change in the amount of light that reaches the light receiving portion, and malfunction due to dew condensation can be prevented in advance. In addition, since malfunction due to dew condensation can be prevented, the size can be reduced.

【0009】また、拡散体として広角レンズを用い、広
角レンズとしては凹レンズを用いることができるので、
簡単な構成で発光ビームを拡散させることができる。ま
た、拡散体として拡散板を用いた場合には、発光部面積
を大きくすることができ、結露だけではなく、虫などの
付着による誤作動を未然に防止することができる。
Since a wide-angle lens can be used as the diffuser and a concave lens can be used as the wide-angle lens,
The emission beam can be diffused with a simple structure. When a diffuser plate is used as the diffuser, the area of the light emitting portion can be increased, and not only dew condensation but also malfunction due to adhesion of insects can be prevented.

【0010】さらに、拡散体の代りに発光素子の指向角
を広くしても良いので、この場合としては構成はさらに
簡単になる。
Furthermore, since the directivity angle of the light emitting element may be widened instead of the diffuser, the structure is further simplified in this case.

【0011】[0011]

【発明の実施の形態】図1は本発明の光電式煙感知器の
配置を示す図である。図1において、1,2は一対のT
バーであり、Tバー1,2は図示しない天井に取り付け
られ、Tバー1,2の間にはスリット3が形成されてい
る。空気調整装置が作動しているときは、天井面より下
側の部屋4の空気は吸込圧によりスリット3から天井裏
側に強制的に吸い込まれるようになっている。
1 is a view showing the arrangement of a photoelectric smoke detector according to the present invention. In FIG. 1, 1 and 2 are a pair of T
The bars are T-bars 1 and 2, which are attached to a ceiling (not shown), and a slit 3 is formed between the T-bars 1 and 2. When the air conditioner is operating, the air in the room 4 below the ceiling surface is forcibly sucked from the slit 3 to the back side of the ceiling by the suction pressure.

【0012】スリット3には送光部5と受光部6が所定
の近距離、例えば50cmだけ分離して配置されてい
る。ここでは、分離する距離を50cmとするが、これ
に限定されるものではなく、30cmまたは100cm
などとしても良い。また、送光部5および受光部6は、
ここではTバー1,2のスリット3に取り付けるように
したが、これに限定されるものではなく、天井面に所定
の近距離だけ分離して取り付けるようにしても良い。
The slit 3 is provided with a light transmitting section 5 and a light receiving section 6 which are separated by a predetermined short distance, for example, 50 cm. Here, the separation distance is 50 cm, but the distance is not limited to this, and is 30 cm or 100 cm.
And so on. Further, the light transmitting unit 5 and the light receiving unit 6 are
Here, the T-bars 1 and 2 are attached to the slits 3, but the present invention is not limited to this, and the T-bars 1 and 2 may be attached to the ceiling surface separately by a predetermined short distance.

【0013】この光電式煙感知器は、送光部5が送光す
る発光ビームの減衰を受光部6で検出して火災を感知す
るものであり、送光部5と受光部6との間の監視光路長
が50cmといった近距離のものでは、減光率が15%
/mのとき50cmで7.5%変化することから、余裕
をみて受光量が例えば7.8%変化したことを判別して
動作しなければならない。
The photoelectric smoke detector detects a fire by detecting the attenuation of the light emitting beam sent by the light sending unit 5 by the light receiving unit 6, and detects the fire. If the monitoring optical path length is 50 cm, the dimming rate is 15%.
Since there is a 7.5% change at 50 cm in the case of / m, it is necessary to operate with a margin, by discriminating that the received light amount has changed by, for example, 7.8%.

【0014】すなわち、送光部5と受光部6との監視光
路長が比較的短い光電式煙感知器においては煙による信
号変化量が小さくなっている。図2は光電式煙感知器の
送光部と受光部の内部構成例を示す図である。 図2に
おいて、5は送光部であり、送光部5内には発光素子7
と、発光素子7を駆動する送光回路8と、発光素子7か
らの発光ビームを拡散させる拡散体としての広角レンズ
9がそれぞれ設けられている。発光素子7は例えば発光
ダイオードよりなり、ビームを発光する。
That is, in the photoelectric smoke detector having a relatively short monitoring optical path length between the light transmitting unit 5 and the light receiving unit 6, the amount of signal change due to smoke is small. FIG. 2 is a diagram showing an internal configuration example of a light transmitting unit and a light receiving unit of the photoelectric smoke detector. In FIG. 2, reference numeral 5 denotes a light transmitting section, and the light emitting element 7 is provided in the light transmitting section 5.
A light transmitting circuit 8 for driving the light emitting element 7 and a wide-angle lens 9 as a diffuser for diffusing a light emission beam from the light emitting element 7 are provided. The light emitting element 7 is composed of, for example, a light emitting diode and emits a beam.

【0015】発光素子7の駆動は、送光回路8で行い、
送光回路8は例えば所定の時間間隔で発光素子7をパル
ス駆動する。広角レンズ9は、例えば凹レンズよりな
り、レンズ径は例えば5mmとする。広角レンズ9は、
発光素子7の発光ビームを広角度に拡散させる。すなわ
ち、広角レンズ9は、発光素子7からの発光ビームをレ
ンズなどにより絞り込むことなく、広げた均一なビーム
とする。
The light emitting element 7 is driven by the light transmitting circuit 8.
The light transmitting circuit 8 pulse-drives the light emitting element 7 at predetermined time intervals, for example. The wide-angle lens 9 is, for example, a concave lens and has a lens diameter of, for example, 5 mm. The wide-angle lens 9
The emission beam of the light emitting element 7 is diffused at a wide angle. In other words, the wide-angle lens 9 makes the light emission beam from the light-emitting element 7 a wide and uniform beam without narrowing it down with a lens or the like.

【0016】これにより、結露がビームを乱された際に
も受光部6に到達する光量の変化を小さくしている。す
なわち、結露による受光量の変化は、監視光路長が50
cmのものでは49%の受光量の減少となり、結露によ
る信号量変化により容易に誤作動してしまうので、広角
レンズ9により発光素子7からの発光ビームを広角度に
拡散して受光部6に到達する光量が大きく変化しないよ
うにしている。
As a result, even if the beam is disturbed by dew condensation, the change in the amount of light reaching the light receiving section 6 is reduced. That is, the change in the amount of received light due to dew condensation is caused by the monitoring optical path length
In the case of the cm type, the amount of received light is reduced by 49%, and malfunction easily occurs due to a change in signal amount due to dew condensation. The amount of light that arrives is not changed significantly.

【0017】この広角レンズ9を発光素子7の前方に設
けることにより、ビーム半値角を例えば30度と大きく
することができる。ビーム半値角は、図2において、広
角レンズ9の光軸aと矢印bで示す光軸aの光出力に比
べて2分の1となるビームとの角度cで示される。ここ
で広角レンズ9のビーム半値角に対する結露時のビーム
面積は (ビーム半値角で決まるビーム面積)+(結露の拡散角
で決まるビーム面積) で定義される。
By providing the wide-angle lens 9 in front of the light emitting element 7, the half-value angle of the beam can be increased to, for example, 30 degrees. The beam half-value angle is shown in FIG. 2 as an angle c between the optical axis a of the wide-angle lens 9 and the beam that is half the optical output of the optical axis a indicated by the arrow b. Here, the beam area at the time of condensation with respect to the beam half-value angle of the wide-angle lens 9 is defined by (beam area determined by the beam half-value angle) + (beam area determined by the diffusion angle of the condensation).

【0018】例えば広角レンズ9によってビーム半値角
を30度とすると、ビーム面積は例えば2.62×10
5 mm2 と大きくなる。このような広角度の発光ビーム
を作るために、広角レンズ9として凹レンズを用いてい
るが、これに代えて指向角が広い発光素子7を用いるよ
うにしても良い。送光部5と所定の近距離、例えば50
cm分離して受光部6が設けられ、受光部6内には集光
レンズ10、受光素子11、受光回路12が設けられて
いる。集光レンズ10は、広角レンズ9により広角度に
拡散させた発光ビームを集光する。集光レンズ10は、
矢印dで示すような拡散された発光ビームを集光して受
光素子11に出力する。受光素子11は、例えば受光ダ
イオードよりなり、集光レンズ10で集光した発光ビー
ムを受光し、光電変換して受光回路11に出力する。受
光回路11は受光素子10からの電気信号を増幅し、受
光量が一定値以下になると火災検出信号を出力する。受
光回路11で受光する受光量は、発光ビームを広角度に
拡散しているため、結露により発光ビームが乱された際
にも変化しないようになっている。
For example, assuming that the beam half-value angle is 30 degrees by the wide-angle lens 9, the beam area is, for example, 2.62 × 10.
It will be as large as 5 mm 2 . Although a concave lens is used as the wide-angle lens 9 in order to generate such a wide-angle emission beam, a light-emitting element 7 having a wide directional angle may be used instead of this. A predetermined short distance from the light transmitting unit 5, for example, 50
The light receiving section 6 is provided with a separation of cm, and a condenser lens 10, a light receiving element 11, and a light receiving circuit 12 are provided in the light receiving section 6. The condenser lens 10 condenses the emission beam diffused at a wide angle by the wide-angle lens 9. The condenser lens 10 is
The diffused emission beam as indicated by arrow d is collected and output to the light receiving element 11. The light receiving element 11 is composed of, for example, a light receiving diode, receives the light emission beam condensed by the condenser lens 10, photoelectrically converts it, and outputs it to the light receiving circuit 11. The light receiving circuit 11 amplifies the electric signal from the light receiving element 10 and outputs a fire detection signal when the amount of received light becomes a certain value or less. The amount of light received by the light receiving circuit 11 does not change even when the emission beam is disturbed by dew condensation because the emission beam is diffused at a wide angle.

【0019】このように、本発明の実施形態において
は、発光素子7の前方に広角レンズ9を設けて発光ビー
ムを広角度に拡散したため、すなわち図4に示すよう
に、従来のビーム半角値が2.5度になるのに対して、
ビーム半値角を30度に大きくして、通常時のビーム面
積を従来の1.50×103 mm2 から2.62×10
5mm2 にしたため、結露による受光量の減少は、従来
の49%から7.7%に減少する。
As described above, in the embodiment of the present invention, since the wide-angle lens 9 is provided in front of the light-emitting element 7 to spread the emission beam at a wide angle, that is, as shown in FIG. While it is 2.5 degrees,
By increasing the beam half-value angle to 30 degrees, the beam area under normal conditions is changed from the conventional 1.50 × 10 3 mm 2 to 2.62 × 10.
Since it is set to 5 mm 2 , the amount of received light due to dew condensation is reduced from 49% in the past to 7.7%.

【0020】このため、結露による非火災の確率比は、
従来の6.30から1.00に減少する。すなわち、点
光源から面光源にしたため、誤作動は1/6に減少す
る。このように、結露による誤作動を未然に防止するこ
とができる。また、結露による誤作動を防止することが
できるため、光電式煙感知器の小型化を図ることができ
る。
Therefore, the probability ratio of non-fire due to condensation is
It decreases from the conventional 6.30 to 1.00. That is, since the point light source is changed to the surface light source, the malfunction is reduced to 1/6. In this way, malfunction due to dew condensation can be prevented in advance. Further, since malfunction due to dew condensation can be prevented, the photoelectric smoke detector can be downsized.

【0021】次に、図3は本発明の他の実施形態を示す
図である。図3において、5は送光部であり、送光部5
内には発光素子7と発光回路8と拡散体としての拡散板
13がそれぞれ設けられている。発光素子7はビームを
発光し、発光回路8によって所定の時間間隔をおいて駆
動される。発光素子7の前方には拡散板13が設けら
れ、拡散板13は発光素子7からの発光ビームを広く拡
散させる。これにより結露で発光ビームが乱された際に
も受光部6に到達する受光量が変化しないようにしてい
る。
Next, FIG. 3 is a diagram showing another embodiment of the present invention. In FIG. 3, reference numeral 5 denotes a light transmitting unit, and the light transmitting unit 5
A light emitting element 7, a light emitting circuit 8 and a diffusion plate 13 as a diffuser are provided therein. The light emitting element 7 emits a beam and is driven by the light emitting circuit 8 at predetermined time intervals. A diffuser plate 13 is provided in front of the light emitting element 7, and the diffuser plate 13 widely diffuses the light emission beam from the light emitting element 7. This prevents the amount of light received reaching the light receiving unit 6 from changing even when the emission beam is disturbed by dew condensation.

【0022】拡散板13は発光ビームを矢印eで示すよ
うに広く拡散させるだけではなく発光部面積を大きくし
た。すなわち、拡散板13の面積を大きくとることによ
り結露だけではなく、虫などの付着による誤作動を防止
するようにしている。例えば、虫の大きさを2mm、レ
ンズ径を5mmとすると、減光比は16%となり、レン
ズ径を10mmとすると、減光比は4%、レンズ径を3
0mmとすると、減光比は0.44%、レンズ径を50
mmとすると、減光比は0.16%となり、レンズ径が
大きくなるほど減光比は小さくなる。
The diffuser plate 13 not only diffuses the emission beam widely as indicated by arrow e, but also enlarges the area of the light emitting portion. That is, by making the area of the diffusion plate 13 large, not only dew condensation but also malfunction due to adhesion of insects and the like is prevented. For example, if the insect size is 2 mm and the lens diameter is 5 mm, the extinction ratio is 16%, and if the lens diameter is 10 mm, the extinction ratio is 4% and the lens diameter is 3%.
Assuming 0 mm, the extinction ratio is 0.44% and the lens diameter is 50
mm, the extinction ratio is 0.16%, and the larger the lens diameter, the smaller the extinction ratio.

【0023】このように、拡散板13の面積を大きくし
たため、結露だけではなく、虫などの付着による誤作動
を防止することができる。
Since the area of the diffusion plate 13 is increased in this way, not only dew condensation but also malfunction due to adhesion of insects can be prevented.

【0024】[0024]

【発明の効果】以上説明してきたように、本発明によれ
ば、送光部の発光素子の前方に拡散体を設けて、発光ビ
ームを拡散させるようにしたため、結露により発光ビー
ムが乱された際にも受光部に到達する光量が変化しない
ので、結露による誤作動を未然に防止することができ
る。また、結露による誤作動を防止することができるた
め、小型化を図ることができる。さらに、拡散体の発光
部面積を大きくしたため、結露だけではなく、虫などの
付着による誤作動も防止することができる。
As described above, according to the present invention, since the diffuser is provided in front of the light emitting element of the light transmitting section to diffuse the emitted beam, the emitted beam is disturbed by dew condensation. Even in this case, since the amount of light reaching the light receiving portion does not change, malfunction due to dew condensation can be prevented. Further, since malfunction due to dew condensation can be prevented, the size can be reduced. Further, since the area of the light emitting portion of the diffuser is increased, not only dew condensation but also malfunction due to adhesion of insects can be prevented.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の光電式煙感知器の送光部と受光部の配
置を示す図
FIG. 1 is a diagram showing an arrangement of a light transmitting unit and a light receiving unit of a photoelectric smoke detector according to the present invention.

【図2】送光部と受光部の内部構成例を示す図FIG. 2 is a diagram showing an internal configuration example of a light transmitting unit and a light receiving unit.

【図3】本発明の他の実施形態を示す図FIG. 3 is a diagram showing another embodiment of the present invention.

【図4】本発明と従来例とを対比して示す説明図FIG. 4 is an explanatory view showing the present invention in comparison with a conventional example.

【符号の説明】[Explanation of symbols]

1,2:Tバー 3:スリット 4:部屋 5:送光部 6:受光部 7:発光素子 8:送光回路 9:広角レンズ(拡散体) 10:集光レンズ 11:受光素子 12:受光回路 13:拡散板(拡散体) 1, 2: T bar 3: Slit 4: Room 5: Light emitting part 6: Light receiving part 7: Light emitting element 8: Light sending circuit 9: Wide-angle lens (diffuser) 10: Condensing lens 11: Light receiving element 12: Light receiving Circuit 13: Diffusion plate (diffuser)

Claims (5)

【特許請求の範囲】[Claims] 【請求項1】発光素子を有する送光部と、受光素子を有
する受光部を所定の近距離だけ分離して配置しその間の
煙による光の減衰を検出する光電式煙感知器に於いて、 前記発光素子の前方に、前記発光素子が発光する発光ビ
ームを拡散させる拡散体を設けたことを特徴とする光電
式煙感知器。
1. A photoelectric smoke detector for detecting a light attenuation due to smoke between a light-transmitting portion having a light-emitting element and a light-receiving portion having a light-receiving element separated by a predetermined short distance. A photoelectric smoke detector, characterized in that a diffuser for diffusing an emission beam emitted by the light emitting element is provided in front of the light emitting element.
【請求項2】請求項1記載の光電式煙感知器に於いて、
前記拡散体として広角レンズを用いたことを特徴とする
光電式煙感知器。
2. The photoelectric smoke detector according to claim 1, wherein
A photoelectric smoke detector, wherein a wide-angle lens is used as the diffuser.
【請求項3】請求項2記載の光電式煙感知器に於いて、
前記広角レンズとして凹レンズを用いたことを特徴とす
る光電式煙感知器。
3. The photoelectric smoke detector according to claim 2, wherein:
A photoelectric smoke detector characterized in that a concave lens is used as the wide-angle lens.
【請求項4】請求項1記載の光電式煙感知器に於いて、
前記拡散体として拡散板を用いたことを特徴とする光電
式煙感知器。
4. The photoelectric smoke detector according to claim 1, wherein:
A photoelectric smoke detector, wherein a diffuser plate is used as the diffuser.
【請求項5】請求項1記載の光電式煙感知器に於いて、
前記拡散体の代りに前記発光素子の指向角を広くしたこ
とを特徴とする光電式煙感知器。
5. The photoelectric smoke detector according to claim 1, wherein
A photoelectric smoke detector, wherein the light emitting device has a wide directional angle instead of the diffuser.
JP32536395A 1995-12-14 1995-12-14 Photoelectric type smoke detector Pending JPH09161176A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP32536395A JPH09161176A (en) 1995-12-14 1995-12-14 Photoelectric type smoke detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP32536395A JPH09161176A (en) 1995-12-14 1995-12-14 Photoelectric type smoke detector

Publications (1)

Publication Number Publication Date
JPH09161176A true JPH09161176A (en) 1997-06-20

Family

ID=18175997

Family Applications (1)

Application Number Title Priority Date Filing Date
JP32536395A Pending JPH09161176A (en) 1995-12-14 1995-12-14 Photoelectric type smoke detector

Country Status (1)

Country Link
JP (1) JPH09161176A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016051361A (en) * 2014-09-01 2016-04-11 能美防災株式会社 Light extinction type smoke sensor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016051361A (en) * 2014-09-01 2016-04-11 能美防災株式会社 Light extinction type smoke sensor

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