JP5379369B2 - Photoelectric smoke detector - Google Patents

Photoelectric smoke detector Download PDF

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JP5379369B2
JP5379369B2 JP2007284127A JP2007284127A JP5379369B2 JP 5379369 B2 JP5379369 B2 JP 5379369B2 JP 2007284127 A JP2007284127 A JP 2007284127A JP 2007284127 A JP2007284127 A JP 2007284127A JP 5379369 B2 JP5379369 B2 JP 5379369B2
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light
smoke
housing
light receiving
optical axis
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JP2009110434A (en
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光輝 西田
修平 黒田
裕紀 辰巳
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New Cosmos Electric Co Ltd
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New Cosmos Electric Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a photoelectric smoke sensor having high smoke detection accuracy. <P>SOLUTION: This photoelectric smoke sensor has: a housing 21 having a plurality of wall parts 23 making smoke from the outside flow in the housing 21 and shielding direct light from the outside; a light emission part 25 irradiating light into the housing 21; a light reception part 26 receiving scattered light of the light by the smoke flowing into the housing 21; and a light shielding wall 27 shielding direct light toward the light reception part 26 from the light emission part 25. The light emission part 25 and the light reception part 26 are provided such that respective optical axes of them cross inside the housing 21, and are provided such that the optical axis of the light reception part 26 is directed to an edge part 27a on the optical axis side of the light emission part 25 of the light shielding wall 27. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

本発明は、外部からの煙を流入させると共に外部からの直接光を遮断する複数の壁部を備えたハウジングと、前記ハウジングの内部に光を照射する発光部と、前記ハウジングの内部に流入した煙による前記光の散乱光を受光する受光部と、前記発光部から前記受光部へ向かう直接光を遮断する遮光壁とを備えた光電式煙感知器に関する。   The present invention includes a housing having a plurality of wall portions that allow smoke from the outside to flow in and blocks direct light from the outside, a light emitting portion that irradiates light inside the housing, and a flow that flows into the housing. The present invention relates to a photoelectric smoke detector including a light receiving unit that receives scattered light of the light due to smoke and a light shielding wall that blocks direct light from the light emitting unit toward the light receiving unit.

従来、光電式煙感知器は、ハウジングによって形成される煙検知室に、当該煙検知室内に光を照射する発光部と光を受光する受光部とを設け、煙が煙検知室内に流入した場合に当該煙によって光が散乱することを利用し、この散乱光を検出することで煙を検知する。   Conventionally, a photoelectric smoke detector is provided with a light emitting unit that emits light and a light receiving unit that receives light in a smoke detection chamber formed by a housing, and smoke flows into the smoke detection chamber. In addition, the light is scattered by the smoke, and the smoke is detected by detecting the scattered light.

このような光電式煙感知器では、外部からの煙はハウジング内に通すが外部からの光を遮断する複数のラビリンス壁等を設けると共に、煙検知室内に発光部から受光部へ向かう直接光を遮断する遮光壁を設けて、受光部における煙による散乱光の検出精度を高めている(例えば、特許文献１参照)。   In such a photoelectric smoke detector, a plurality of labyrinth walls and the like are provided that allow smoke from the outside to pass through the housing but block light from the outside, and direct light directed from the light emitting portion to the light receiving portion is provided in the smoke detection chamber. A light blocking wall for blocking is provided to improve the detection accuracy of scattered light due to smoke in the light receiving unit (see, for example, Patent Document 1).

特開平９−２３１４８５号公報JP-A-9-231485

前記従来の光電式煙感知器では、ハウジングに設けた複数の壁部や煙検知室内に設けた遮光壁によって、発光部から受光部に向かう直接光は遮断することができる。しかし、この直接光が壁部や遮光壁等によって反射する光については、その一部が受光部に到達する虞があった。このため、前記従来の光電式煙感知器では、煙による散乱光自体が微弱であることから反射光が散乱光検出におけるノイズ成分となり、煙の検知精度が低下するという問題があった。   In the conventional photoelectric smoke detector, direct light from the light emitting portion to the light receiving portion can be blocked by a plurality of wall portions provided in the housing and a light shielding wall provided in the smoke detection chamber. However, there is a possibility that a part of the direct light reflected by the wall portion or the light shielding wall reaches the light receiving portion. For this reason, the conventional photoelectric smoke detector has a problem in that the reflected light becomes a noise component in the detection of scattered light because the scattered light itself from the smoke is weak, and the smoke detection accuracy decreases.

本発明は、上記課題に鑑みてなされたものであり、煙の検知精度が高い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 the above problems, and an object thereof is to provide a photoelectric smoke detector having high smoke detection accuracy.

上記目的を達成するための本発明に係る光電式煙感知器の特徴構成は、外部からの煙を流入させると共に外部からの直接光を遮断する複数の壁部を備えたハウジングと、前記ハウジングの内部に光を照射する発光部と、前記ハウジングの内部に流入した煙による前記光の散乱光を受光する受光部と、前記発光部から前記受光部へ向かう直接光を遮断する遮光壁とを備え、前記発光部と前記受光部とをそれぞれの光軸が前記ハウジングの内部で中心部より前記発光部側で交差するように設けると共に、前記受光部の光軸が前記遮光壁のうち前記中心部側の縁部に向くように設け、前記発光部の光軸と前記受光部の光軸との交点から前記受光部の光軸と前記縁部との交点に至る位置のうちいずれかの位置に焦点を有する集光手段を、前記受光部に設けた点にある。 FEATURES configuration of a photoelectric smoke sensor according to the present invention for achieving the above object, a housing having a plurality of wall portions for blocking direct light from the outside together with flowing a smoke from the outside, the housing A light emitting part that irradiates light inside, a light receiving part that receives the scattered light of the light due to the smoke flowing into the housing, and a light shielding wall that blocks direct light from the light emitting part toward the light receiving part The light emitting portion and the light receiving portion are provided so that their optical axes intersect each other on the light emitting portion side from the center portion inside the housing, and the light axis of the light receiving portion is the center of the light shielding wall. provided to face the edge of the part side, the position of any of the position ranging from the intersection of the optical axis of the light receiving portion and the optical axis of the light emitting portion to the intersection between the rim portion and the optical axis of the light receiving portion Condensing means having a focus on the light receiving section It lies in the fact digits.

本発明者らは、発光部と受光部とをそれぞれの光軸がハウジングの内部で中心部より発光部側で交差するように設けた場合において、ハウジング内部の煙による散乱光を受光部から見た時の光の強度に着目し、遮光壁のうち中心部側の縁部の付近の光強度が最も大きくなることを見出した。 In the case where the light emitting part and the light receiving part are provided so that their optical axes intersect each other on the light emitting part side from the center part inside the housing, the present inventors see scattered light from smoke inside the housing from the light receiving part. Focusing on the light intensity at the time, the light intensity in the vicinity of the edge on the center side of the light shielding wall was found to be the highest.

したがって、本構成のように、受光部を光軸が遮光壁のうちハウジングの内部の中心部側の縁部に向くように設けることにより、受光する煙による散乱光の強度が高くなるため、従来の光電式煙感知器に比べて受光部におけるＳ／Ｎ比を向上させることができ、煙の検知精度を高めることができる。 Therefore, as in this configuration, by providing the light receiving portion so that the optical axis faces the edge of the inside of the housing inside the light shielding wall, the intensity of scattered light due to the received smoke is increased. Compared with the photoelectric smoke detector, the S / N ratio in the light receiving unit can be improved, and the smoke detection accuracy can be improved.

また、本構成によれば、受光部に集光手段を設けることにより、発光部の光軸と受光部の光軸との交点から受光部の光軸と遮光壁の縁部との交点に至る位置のうちいずれかの位置に焦点を有するようにしてある。したがって、受光する煙による散乱光の強度を高くすると共に、ノイズ成分として受光部に到達する反射光の強度を低下させることができるため、受光部におけるＳ／Ｎ比が高くなり、煙の検知精度をより高くすることができる。Further, according to this configuration, by providing the light collecting unit with the light collecting unit, the intersection between the optical axis of the light emitting unit and the optical axis of the light receiving unit reaches the intersection of the optical axis of the light receiving unit and the edge of the light shielding wall. The focal point is set at one of the positions. Accordingly, it is possible to increase the intensity of the scattered light due to the smoke received, and to reduce the intensity of the reflected light reaching the light receiving portion as a noise component, so that the S / N ratio at the light receiving portion is increased and the smoke detection accuracy is increased. Can be made higher.

本発明に係る光電式煙感知器の別の特徴構成は、外部からの煙を流入させると共に外部からの直接光を遮断する複数の壁部を備えたハウジングと、前記ハウジングの内部に光を照射する発光部と、前記ハウジングの内部に流入した煙による前記光の散乱光を受光する受光部と、前記発光部から前記受光部へ向かう直接光を遮断する遮光壁とを備え、前記発光部と前記受光部とをそれぞれの光軸が前記ハウジングの内部で中心部より前記発光部側で交差するように設けると共に、前記受光部の光軸が前記遮光壁のうち前記中心部側の縁部に向くように設けた点にある。Another characteristic configuration of the photoelectric smoke detector according to the present invention includes a housing having a plurality of wall portions that allow smoke from the outside to flow in and block direct light from the outside, and irradiates the inside of the housing with light. A light-emitting unit, a light-receiving unit that receives the scattered light of the light due to the smoke flowing into the housing, and a light-shielding wall that blocks direct light from the light-emitting unit toward the light-receiving unit, The light receiving part is provided so that the respective optical axes intersect the light emitting part side from the central part inside the housing, and the optical axis of the light receiving part is at the edge of the light shielding wall on the central part side. It is in the point that it is set to face.

以下に、本発明に係る光電式煙感知器の一実施形態について図面を参照して説明する。ここでは、本発明を火災警報器１における煙検知部２に適用した場合について説明する。   Hereinafter, an embodiment of a photoelectric smoke detector according to the present invention will be described with reference to the drawings. Here, the case where this invention is applied to the smoke detection part 2 in the fire alarm 1 is demonstrated.

本実施形態に係る火災警報器１は、図３に示すように、正面に、煙を検知する煙検知部２と、音声やブザー等の警報音を発する警報スピーカ３と、ＬＥＤ等による光を点灯または点滅する警報ランプ４とを備える。火災警報器１は、煙検知部２が煙を検知した時に、例えば、煙の濃度が予め設定した閾値より高いか低いかを判断し、煙の濃度が閾値を超えている場合に火災と判定して、警報スピーカ３から警報音を発し、警報ランプ４を点灯させる。火災警報器１には、警報停止ボタン５が設けてあり、これを操作することにより警報スピーカ３からの警報音を停止し、警報ランプ４を消灯することができるようになっている。また、火災警報器１の背面には、火災警報器１を壁材等に固定する取り付け部（図示しない）や、火災警報器１を駆動させる電池を収納する電池収納部（図示しない）等が設けてある。   As shown in FIG. 3, the fire alarm device 1 according to the present embodiment has a smoke detection unit 2 that detects smoke, an alarm speaker 3 that emits an alarm sound such as a voice or a buzzer, and light from an LED or the like on the front. And an alarm lamp 4 that lights or blinks. When the smoke detector 2 detects smoke, the fire alarm 1 determines, for example, whether the smoke concentration is higher or lower than a preset threshold value. If the smoke concentration exceeds the threshold value, the fire alarm 1 is determined to be a fire. Then, an alarm sound is emitted from the alarm speaker 3 and the alarm lamp 4 is turned on. The fire alarm 1 is provided with an alarm stop button 5, which can be operated to stop an alarm sound from the alarm speaker 3 and turn off the alarm lamp 4. Also, on the back of the fire alarm 1, there are an attachment part (not shown) for fixing the fire alarm 1 to a wall material, a battery storage part (not shown) for storing a battery for driving the fire alarm 1, etc. It is provided.

煙検知部２は、図１に示すように、内部に煙を検知する煙検知室２２を有するハウジング２１を備える。ハウジング２１には複数の鉤状の壁部２３が煙検知室２２の周りを取り囲むように設けてあり、煙検知室２２に外部から光を遮断しつつ外部からの煙が流入できるようになっている。また、壁部２３の外側には、金網等で構成される防虫網２４が設けてあり、煙検知室２２に虫等が入り込むことによる誤検知を防止している。   As shown in FIG. 1, the smoke detection unit 2 includes a housing 21 having a smoke detection chamber 22 that detects smoke therein. The housing 21 is provided with a plurality of bowl-shaped wall portions 23 so as to surround the smoke detection chamber 22 so that smoke from the outside can flow into the smoke detection chamber 22 while blocking light from the outside. Yes. Further, an insect repellent net 24 made of a wire net or the like is provided outside the wall portion 23 to prevent erroneous detection due to insects entering the smoke detection chamber 22.

ハウジング２１の内部には、煙検知室２２に近赤外線等の光を照射する発光部としての発光ダイオード等の発光素子２５と、煙検知室２２の光を受光する受光部としてのフォトダイオード等の受光素子２６とが設けてある。また、発光素子２５と受光素子２６との間には遮光壁２７が設けてあり、発光素子２５から受光素子２６へ向かう直接光を遮断できるようになっている。このため、受光素子２６は、通常時には発光素子２５が発する光を受光することはなく、煙検知室２２に煙が流入した時にのみ煙による発光素子２５が発する光の散乱光を受光できるようになる。煙検知部２は、この散乱光を検出することで煙の存在を検知できるようになっている。   Inside the housing 21 are a light emitting element 25 such as a light emitting diode that irradiates the smoke detection chamber 22 with light such as near infrared rays, and a photodiode as a light receiving portion that receives the light from the smoke detection chamber 22. A light receiving element 26 is provided. Further, a light shielding wall 27 is provided between the light emitting element 25 and the light receiving element 26 so that direct light from the light emitting element 25 toward the light receiving element 26 can be blocked. For this reason, the light receiving element 26 does not normally receive the light emitted from the light emitting element 25, and can receive the scattered light of the light emitted from the light emitting element 25 due to the smoke only when the smoke flows into the smoke detection chamber 22. Become. The smoke detector 2 can detect the presence of smoke by detecting the scattered light.

本実施形態に係る火災警報器１の煙検知部２では、受光素子２６を、発光素子２５に対してそれぞれの光軸が煙検知室２２の内でその中心部より発光素子２５側で交差するように配置すると共に、受光素子２６の光軸が遮光壁２７のうち煙検知室２２の中心部側の縁部２７ａに向くように設けてある。遮光壁２７のうち発光素子２５の光軸側の縁部２７ａの付近では、発光素子２５からの直接光だけでなく、直接光が遮光壁２７によって反射した反射光も到達し、煙によって散乱する。このため、受光素子２６から見た時の煙による散乱光の強度は、図２に示すように、遮光壁２７の縁部２７ａの方向が最も高くなる。したがって、受光素子２６の光軸をこの方向に向くように配置することにより、受光素子２５が受光する散乱光の強度が高くなり、Ｓ／Ｎ比が高くなって、煙検知部２の煙の検知精度を高めることができる。 In the smoke detector 2 of the fire alarm device 1 according to the present embodiment, the optical axis of the light receiving element 26 intersects with the light emitting element 25 on the light emitting element 25 side from the center in the smoke detection chamber 22. And the optical axis of the light receiving element 26 is provided so as to face the edge 27 a of the light shielding wall 27 on the center side of the smoke detection chamber 22 . Of the light shielding wall 27, in the vicinity of the edge 27a on the optical axis side of the light emitting element 25, not only direct light from the light emitting element 25 but also reflected light reflected by the light shielding wall 27 arrives and is scattered by smoke. . For this reason, the intensity of the scattered light due to smoke when viewed from the light receiving element 26 is highest in the direction of the edge portion 27a of the light shielding wall 27 as shown in FIG. Therefore, by arranging the optical axis of the light receiving element 26 so as to face this direction, the intensity of the scattered light received by the light receiving element 25 is increased, the S / N ratio is increased, and the smoke of the smoke detector 2 is increased. Detection accuracy can be increased.

また、受光素子２６には集光手段としてのレンズ２８が設けてある。レンズ２８としては、発光素子２５の光軸と受光素子２６の光軸との交点から遮光壁２７の縁部２７ａに至る位置のうちいずれかの位置に焦点を有するものを用いることが好ましい。このようなレンズ２８を設けて、発光素子２５の光軸と受光素子２６の光軸との交点から遮光壁２７の縁部２７ａの間の散乱光を集光し、受光素子２５で受光する煙による散乱光の強度を高くすると共に、ノイズ成分として受光素子２５に到達する壁部２２等で反射する光の強度を低下させることができるため、Ｓ／Ｎ比が高くなり、煙の検知精度をより高くすることができる。尚、レンズ２８として焦点深度の浅いレンズ等を使用する場合には、発光素子２５の光軸と受光素子２６の光軸との交点、または遮光壁２７の縁部２７ａのうちいずれかの点に焦点を有するものを使用することがより好ましい。これらの点において散乱光の強度が最も高くなるため、これらのいずれかの点に焦点を合わせることにより強度の高い散乱光を効率よく受光することができる。したがって、煙による散乱光とノイズ成分となる反射光との強度の差がより大きくなるため、Ｓ／Ｎ比をより高くすることができる。   The light receiving element 26 is provided with a lens 28 as a condensing means. As the lens 28, it is preferable to use a lens having a focal point at any position among the positions from the intersection of the optical axis of the light emitting element 25 and the optical axis of the light receiving element 26 to the edge portion 27 a of the light shielding wall 27. Such a lens 28 is provided to collect the scattered light between the edge 27a of the light shielding wall 27 from the intersection of the optical axis of the light emitting element 25 and the optical axis of the light receiving element 26, and to receive the smoke by the light receiving element 25. In addition to increasing the intensity of the scattered light due to the noise, the intensity of the light reflected by the wall 22 and the like reaching the light receiving element 25 as a noise component can be reduced, so the S / N ratio is increased and the smoke detection accuracy is improved. Can be higher. When a lens having a shallow depth of focus is used as the lens 28, it is at any point of the intersection of the optical axis of the light emitting element 25 and the optical axis of the light receiving element 26 or the edge 27a of the light shielding wall 27. It is more preferable to use one having a focal point. Since the intensity of scattered light is highest at these points, it is possible to efficiently receive scattered light with high intensity by focusing on any of these points. Therefore, the difference in intensity between the scattered light due to the smoke and the reflected light as the noise component becomes larger, so that the S / N ratio can be further increased.

尚、その他の煙検知部２を備えた火災警報器１の構成、機能については、従来公知の火災警報器と同様である。   In addition, about the structure and function of the fire alarm 1 provided with the other smoke detection part 2, it is the same as that of a conventionally well-known fire alarm.

〔別実施形態〕
上記の実施形態においては、受光素子２６にレンズ２８を設けた例を説明したが、レンズ２８は設けなくてもよい。受光素子２６を、光軸が遮光壁２７の縁部２７ａに向くように配置することのみによっても、ノイズ成分となる反射光の強度に対して受光素子２５が受光する散乱光の強度が高くなるため、Ｓ／Ｎ比が高くなり、煙検知部２の煙の検知精度を高めることができる。 [Another embodiment]
In the above embodiment, the example in which the lens 28 is provided in the light receiving element 26 has been described. However, the lens 28 may not be provided. Even by arranging the light receiving element 26 so that the optical axis faces the edge portion 27a of the light shielding wall 27, the intensity of the scattered light received by the light receiving element 25 becomes higher than the intensity of the reflected light as a noise component. Therefore, the S / N ratio is increased, and the smoke detection accuracy of the smoke detector 2 can be increased.

上記の実施形態においては、本発明に係る光電式煙感知器を壁掛け式の火災警報器１に適用した場合を例として説明したが、例えば、天井取り付け式の火災警報器等に適用することもできる。   In the above embodiment, the case where the photoelectric smoke detector according to the present invention is applied to the wall-mounted fire alarm 1 has been described as an example. However, for example, the photoelectric smoke detector may be applied to a ceiling-mounted fire alarm or the like. it can.

（実施例）
以下に、本実施形態に係る火災警報器１を用いた実施例を示し、本発明をより詳細に説明する。但し、本発明はこれらの実施例に限定されるものではない。 (Example)
Below, the Example using the fire alarm device 1 which concerns on this embodiment is shown, and this invention is demonstrated in detail. However, the present invention is not limited to these examples.

本実施形態に係る火災警報器１において、煙検知部２の受光素子２６にレンズ２８を設けない場合（実施例１）と遮光壁２７の縁部２７ａに焦点を有するレンズ２８を設けた場合（実施例２）とについて、煙による散乱光を受光する際のＳ／Ｎ比について調べた。比較例として、従来と同様に、レンズ２８を設けない受光素子２６を、光軸が煙検知室２２の中心部に向くように配置した場合（遮光壁２７の縁部２７ａには向むいていない）についてもＳ／Ｎ比を調べた。   In the fire alarm device 1 according to the present embodiment, when the lens 28 is not provided on the light receiving element 26 of the smoke detector 2 (Example 1) and when the lens 28 having a focus is provided on the edge portion 27a of the light shielding wall 27 ( With respect to Example 2), the S / N ratio when receiving scattered light from smoke was examined. As a comparative example, when the light receiving element 26 not provided with the lens 28 is arranged so that the optical axis faces the center of the smoke detection chamber 22 as in the conventional case (not toward the edge 27a of the light shielding wall 27). ) Was also examined for the S / N ratio.

その結果、表１に示すように、比較例に比べて、受光素子２５の光軸を遮光壁２７の縁部２７ａに向けることでＳ／Ｎ比が向上し、レンズ２８を設けることでＳ／Ｎ比はより高くなることが分かった。

Figure 0005379369
As a result, as shown in Table 1, the S / N ratio is improved by directing the optical axis of the light receiving element 25 toward the edge 27a of the light shielding wall 27 as compared with the comparative example, and the S / N ratio is improved by providing the lens 28. It has been found that the N ratio is higher.
Figure 0005379369

本発明に係る光電式煙感知器は、煙を検知する煙センサ、煙を検知して警報を発する警報器、煙の濃度を測定する測定器等に適用することができる。   The photoelectric smoke detector according to the present invention can be applied to a smoke sensor that detects smoke, an alarm device that detects smoke and issues an alarm, a measuring device that measures smoke concentration, and the like.

本実施形態に係る煙検知部の平断面図Plan sectional view of the smoke detector according to the present embodiment 煙による散乱光の強度を示すグラフGraph showing the intensity of light scattered by smoke 本実施形態に係る火災警報器の模式図Schematic diagram of fire alarm according to this embodiment

符号の説明Explanation of symbols

１ 火災警報器
２ 煙検知部
２１ ハウジング
２３ 壁部
２５ 発光素子（発光部）
２６ 受光素子（受光部）
２７ 遮光壁
２７ａ 縁部
２８ レンズ（集光手段） DESCRIPTION OF SYMBOLS 1 Fire alarm 2 Smoke detection part 21 Housing 23 Wall part 25 Light emitting element (light emission part)
26 Light receiving element (light receiving part)
27 Shielding Wall 27a Edge 28 Lens (Condensing means)

Claims (2)

外部からの煙を流入させると共に外部からの直接光を遮断する複数の壁部を備えたハウジングと、
前記ハウジングの内部に光を照射する発光部と、
前記ハウジングの内部に流入した煙による前記光の散乱光を受光する受光部と、
前記発光部から前記受光部へ向かう直接光を遮断する遮光壁とを備え、
前記発光部と前記受光部とをそれぞれの光軸が前記ハウジングの内部で中心部より前記発光部側で交差するように設けると共に、前記受光部の光軸が前記遮光壁のうち前記中心部側の縁部に向くように設けてあり、
前記発光部の光軸と前記受光部の光軸との交点から前記受光部の光軸と前記縁部との交点に至る位置のうちいずれかの位置に焦点を有する集光手段を、前記受光部に設けた光電式煙感知器。 A housing having a plurality of wall portions that allow smoke from the outside to flow in and block direct light from the outside; and
A light emitting unit for irradiating light inside the housing;
A light receiving unit that receives the scattered light of the light caused by smoke flowing into the housing;
A light shielding wall that blocks direct light from the light emitting unit toward the light receiving unit,
The light emitting part and the light receiving part are provided so that their optical axes intersect each other on the light emitting part side from the central part inside the housing, and the optical axis of the light receiving part is on the central part side of the light shielding wall. Oh Ri provided so as to face the edges,
A light collecting unit having a focal point at any one of positions from an intersection of an optical axis of the light emitting unit and an optical axis of the light receiving unit to an intersection of the optical axis of the light receiving unit and the edge; Photoelectric smoke detector provided in the section . 外部からの煙を流入させると共に外部からの直接光を遮断する複数の壁部を備えたハウジングと、
前記ハウジングの内部に光を照射する発光部と、
前記ハウジングの内部に流入した煙による前記光の散乱光を受光する受光部と、
前記発光部から前記受光部へ向かう直接光を遮断する遮光壁とを備え、
前記発光部と前記受光部とをそれぞれの光軸が前記ハウジングの内部で中心部より前記発光部側で交差するように設けると共に、前記受光部の光軸が前記遮光壁のうち前記中心部側の縁部に向くように設けてある光電式煙感知器。 A housing having a plurality of wall portions that allow smoke from the outside to flow in and block direct light from the outside; and
A light emitting unit for irradiating light inside the housing;
A light receiving unit that receives the scattered light of the light caused by smoke flowing into the housing;
A light shielding wall that blocks direct light from the light emitting unit toward the light receiving unit,
The light emitting part and the light receiving part are provided so that their optical axes intersect each other on the light emitting part side from the central part inside the housing, and the optical axis of the light receiving part is on the central part side of the light shielding wall. Photoelectric smoke detector provided to face the edge of the .
JP2007284127A 2007-10-31 2007-10-31 Photoelectric smoke detector Expired - Fee Related JP5379369B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111292500A (en) * 2018-12-07 2020-06-16 杭州海康消防科技有限公司 Smoke-sensitive fire detection alarm

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JP6437732B2 (en) * 2014-03-28 2018-12-12 能美防災株式会社 smoke detector

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5734441Y2 (en) * 1978-12-01 1982-07-29
JPS63167246A (en) * 1986-12-27 1988-07-11 Hochiki Corp Scattered light type smoke sensor
JP2691951B2 (en) * 1991-03-29 1997-12-17 ホーチキ 株式会社 Photoelectric smoke detector
JP2648560B2 (en) * 1993-04-09 1997-09-03 ホーチキ株式会社 Scattered light smoke detector
JP3256364B2 (en) * 1994-02-03 2002-02-12 ホーチキ株式会社 Fire detector test equipment
JP3338608B2 (en) * 1996-02-26 2002-10-28 松下電工株式会社 Photoelectric smoke detector
JPH11312281A (en) * 1998-04-30 1999-11-09 Hochiki Corp Photoelectric smoke sensor
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111292500A (en) * 2018-12-07 2020-06-16 杭州海康消防科技有限公司 Smoke-sensitive fire detection alarm
CN111292500B (en) * 2018-12-07 2022-02-08 杭州海康消防科技有限公司 Smoke-sensitive fire detection alarm

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