JP3338608B2 - Photoelectric smoke detector - Google Patents
Photoelectric smoke detectorInfo
- Publication number
- JP3338608B2 JP3338608B2 JP03801496A JP3801496A JP3338608B2 JP 3338608 B2 JP3338608 B2 JP 3338608B2 JP 03801496 A JP03801496 A JP 03801496A JP 3801496 A JP3801496 A JP 3801496A JP 3338608 B2 JP3338608 B2 JP 3338608B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- light emitting
- light receiving
- disturbance
- photoelectric smoke
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
- Fire-Detection Mechanisms (AREA)
Description
【0001】[0001]
【発明の属する技術分野】本発明は、光電式煙感知器に
関し、特に煙感知室内の受光素子には、煙による散乱光
以外の入光をなくして、温度変化等の環境変化に強い、
薄型の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, and more particularly, to a light receiving element in a smoke sensing room which is free from light other than light scattered by smoke and is resistant to environmental changes such as temperature changes.
The present invention relates to a thin photoelectric smoke detector.
【0002】[0002]
【従来の技術】近時においては、光電式煙感知器も小型
で薄型化される傾向にある。図10に示したものは、L
EDで構成された発光部101とプリズムレンズで構成
された受光部102のそれぞれの光軸L1,L2を、煙
感知室100内で同一水平面上に位置させたもので、双
方の光軸を同一水平面上に配置させない構造のものとは
異なり、煙感知室を薄型にできるため、全体として煙感
知器も薄型化が図れる。2. Description of the Related Art In recent years, photoelectric smoke detectors also tend to be small and thin. The one shown in FIG.
The respective optical axes L1 and L2 of the light emitting unit 101 constituted by the ED and the light receiving unit 102 constituted by the prism lens are located on the same horizontal plane in the smoke sensing chamber 100, and both optical axes are the same. Unlike the structure in which the smoke detector is not arranged on a horizontal plane, the smoke detection chamber can be made thinner, so that the smoke detector can be made thinner as a whole.
【0003】ところが、このような光電式煙感知器で
は、煙感知室100内に侵入した煙による散乱光以外の
光も受光部102に直接に入射してしまうため、発光部
101と受光部102の光軸L1,L2を同一水平面上
で所定の角度θをもって配置するとともに、発光部10
1と受光部102との間には、2本のWエッジ部を形成
した外乱遮光用支柱103を突設して、この外乱遮光用
支柱103によって発光部101から受光部102への
直接入光と、煙感知室100内のラビリンス壁で反射さ
れた光が受光部102へ入光をするのを防止している。However, in such a photoelectric smoke detector, light other than the scattered light due to the smoke that has entered the smoke detection chamber 100 also directly enters the light receiving unit 102, so that the light emitting unit 101 and the light receiving unit 102 Are arranged at a predetermined angle θ on the same horizontal plane, and the light emitting units 10
A disturbance light-shielding column 103 having two W-edges is formed between the light-emitting unit 101 and the light-receiving unit 102, and the disturbance light-shielding column 103 directly enters light from the light-emitting unit 101 to the light-receiving unit 102. This prevents light reflected on the labyrinth wall in the smoke sensing chamber 100 from entering the light receiving unit 102.
【0004】ところが、このような構造では、煙感知室
100のラビリンス壁で反射した光が更に外乱遮光用支
柱103のWエッジ部の受光部側面103aで反射して
受光部102に入射してしまうことがあり、このような
外乱光は周囲温度が高くなり、発光部からの出力が低下
するにつれて、無視できなくなってしまう。図11と図
12とは、外乱光Nが大きい場合と、小さい場合におけ
る煙濃度に対する受光素子の出力変化を示しており、X
は周囲温度が常温時の出力特性、X’は周囲温度が上昇
して、受光量が低下した時の出力特性を示しているが、
煙濃度AとA’(A<A’)との差は、外乱光Nが大き
い程、大きくなっていることが分かる。However, in such a structure, the light reflected on the labyrinth wall of the smoke sensing chamber 100 is further reflected on the light receiving portion side surface 103a of the W edge portion of the disturbance light shielding column 103 and enters the light receiving portion 102. In some cases, such disturbance light cannot be ignored as the ambient temperature increases and the output from the light emitting unit decreases. FIGS. 11 and 12 show changes in the output of the light receiving element with respect to the smoke density when the disturbance light N is large and when the disturbance light N is small.
Indicates output characteristics when the ambient temperature is normal temperature, and X 'indicates output characteristics when the ambient temperature increases and the amount of received light decreases.
It can be seen that the difference between the smoke density A and A ′ (A <A ′) increases as the disturbance light N increases.
【0005】[0005]
【発明が解決しようとする課題】本発明は、上記した事
情に鑑みてなされたもので、煙感知室内における発光部
と受光部の光軸を同一水平面上に位置するように配置し
た光電式煙感知器において、更に煙感知室内における散
乱光以外の光が受光部への入光しない構造として、周囲
温度の変化に対しても影響の少ない薄型の光電式煙感知
器を提供することを目的としている。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has been made in consideration of the above circumstances, and has a photoelectric smoke detector in which a light emitting unit and a light receiving unit in a smoke sensing chamber are arranged so that their optical axes are located on the same horizontal plane. With the aim of providing a thin photoelectric smoke sensor that is less affected by changes in ambient temperature as a structure in which light other than scattered light in the smoke sensing room does not enter the light receiving unit. I have.
【0006】[0006]
【課題を解決するための手段】上記目的を達成するため
に提案された本発明は、請求項1〜6において提案した
構造的特徴を有している。すなわち、請求項1では、L
EDなどの発光素子を設けた発光部と、受光素子側に光
路を変更させ、集光させるプリズムレンズを設けた受光
部とを、それぞれの光軸が同一水平面上で所定の角度を
もって対設し、更に発光部と受光部との間には発光部か
ら受光部への直接の入光を遮光する外乱遮光用支柱を突
設するとともに、周囲にはラビリンス壁を形成した煙感
知室を有した光電式煙感知器において、上記第1の外乱
遮光用支柱の受光部側には更に光トラップ面を形成し
て、その部分での反射光をなくす構造としている。The invention proposed to achieve the above object has the structural features proposed in claims 1-6. That is, in claim 1, L
A light-emitting part provided with a light-emitting element such as an ED and a light-receiving part provided with a prism lens that changes the optical path to the light-receiving element side and converges light are arranged to face each other at a predetermined angle on the same horizontal plane. Further, between the light-emitting part and the light-receiving part, a disturbance light-shielding column that blocks light directly entering from the light-emitting part to the light-receiving part is protrudingly provided, and a smoke sensing chamber having a labyrinth wall formed around the column. In the photoelectric smoke detector, a light trapping surface is further formed on the light receiving portion side of the first disturbance light shielding column to eliminate the reflected light at that portion.
【0007】また、請求項2では、光トラップ面は、複
数の縦溝で構成された光トラップ溝を形成した構造とな
っており、請求項3では、複数の縦溝を形成する代わり
に粗面に加工して形成されており、これらによって煙感
知室内の第1の外乱遮光用支柱の受光部側面で反射され
た光は受光部へは入光しないようにしている。請求項4
では、請求項1または2において、煙感知室は、LED
などの発光素子を収容する発光素子収容部と受光素子側
に光路を変更させ、集光するプリズムレンズを収容する
プリズム収容部とを対設した光学基台と、上記受光素子
を面実装するとともに、上記LEDなどの発光素子を実
装し、上記光学基台に組み付けされる回路基板と、ラビ
リンス壁を周囲に形成し、一方を開口させたラビリンス
筒体とを組み合わせて構成されており、受光素子は熱的
ノイズによる影響の受け易いリードを介せずに回路基板
に直接面実装させた構造としているので、リード部分で
の電気的ノイズもなく、より熱的変化の影響を受け難い
ものとなる。According to a second aspect of the present invention, the optical trapping surface has a structure in which an optical trapping groove composed of a plurality of vertical grooves is formed. The light reflected on the side surface of the light-receiving portion of the first disturbance light-shielding column in the smoke sensing chamber is prevented from entering the light-receiving portion. Claim 4
Then, in claim 1 or 2, the smoke sensing chamber is an LED
The light path is changed to the light emitting element housing part for housing the light emitting element and the light receiving element side, and the optical base having the prism housing part for housing the prism lens for collecting light, and the light receiving element are surface-mounted. A light-emitting element, such as an LED, mounted thereon, a circuit board assembled to the optical base, and a labyrinth wall formed around the labyrinth wall and having one opening, and a light receiving element Has a structure that is directly surface-mounted on the circuit board without the intermediary of leads that are easily affected by thermal noise, so there is no electrical noise at the leads, making it less susceptible to thermal changes. .
【0008】請求項5では、請求項1または2におい
て、発光部の近傍には、上記受光部から見たときには上
記第1の外乱遮光用支柱の陰に隠れ、かつ発光部から受
光部に対向するラビリンス壁には光の投射経路が形成さ
れないように、別の外乱遮光用支柱を第2の外乱遮光用
支柱として突設しており、これによって、受光部に対向
するラビリンス壁からの反射光を受光部に直接入光させ
ないようにしている。According to a fifth aspect of the present invention, in the first or second aspect, in the vicinity of the light emitting portion, the light source is hidden behind the first disturbance light shielding column when viewed from the light receiving portion, and faces the light receiving portion from the light emitting portion. In order to prevent a light projection path from being formed on the labyrinth wall, another disturbance light-shielding column is protruded as a second disturbance light-shielding column, whereby reflected light from the labyrinth wall facing the light receiving portion is provided. Is prevented from directly entering the light receiving section.
【0009】請求項6では、請求項1〜4のいずれかに
おいて、発光部と受光部とを対設している所定の角度
を、感度を低下させることなく、しかも外乱光の影響が
少ないと本発明者らの実験によって確認された120度
から140度の範囲に規定したものであり、発光部と受
光部の光軸のなす角度をこのように規定することによっ
て、発光部と受光部の光軸を、同一水平面に配置して薄
型化した場合でも、煙による散乱光は十分に感知し、そ
れ以外の光には感知し難いものに出来る。According to a sixth aspect of the present invention, in any one of the first to fourth aspects, the predetermined angle at which the light-emitting portion and the light-receiving portion are opposed to each other can be set without lowering the sensitivity and without the influence of disturbance light. It is defined in the range of 120 degrees to 140 degrees confirmed by the experiments of the present inventors, and by defining the angle between the optical axis of the light emitting unit and the light receiving unit as described above, the light emitting unit and the light receiving unit are defined. Even when the optical axis is arranged on the same horizontal plane to reduce the thickness, it is possible to sufficiently detect scattered light due to smoke and hardly detect light scattered by other lights.
【0010】[0010]
【発明の実施の形態】以下、本発明の光電式煙感知器の
実施例を図面とともに説明する。図1は煙感知室内にお
ける発光部と受光部の平面配置を示しており、発光部に
1は、LEDなどの発光素子Lが配設され、受光部2に
は、プリズムレンズ21が配設され、発光部1と受光部
2とは、それぞれの光軸L1,L2が同一水平面上で1
30度の角度θをもって交差している。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the photoelectric smoke detector according to the present invention will be described below with reference to the drawings. FIG. 1 shows a plane arrangement of a light emitting unit and a light receiving unit in a smoke sensing room. In the light emitting unit, 1 is provided with a light emitting element L such as an LED, and in the light receiving unit 2, a prism lens 21 is provided. , The light emitting unit 1 and the light receiving unit 2 are such that their respective optical axes L1 and L2 are 1 on the same horizontal plane.
They cross at an angle θ of 30 degrees.
【0011】また、3は第1の外乱遮光用支柱であり、
この支柱3は、発光部1からの投光の障害にならず、か
つ発光部1から受光部2には直接入光しないように、そ
の長さ寸法と位置が規定されている。また、煙感知室S
の周囲には、煙の侵入は許容し、外光の侵入を防止する
複数の壁片を適宜間隔を保持し、重合配設したラビリン
ス壁41が形成されている。Reference numeral 3 denotes a first disturbance light shielding support,
The length and the position of the support pillar 3 are defined so as not to hinder the light emission from the light emitting unit 1 and not to directly enter the light receiving unit 2 from the light emitting unit 1. In addition, smoke detection room S
A labyrinth wall 41 in which a plurality of wall pieces for allowing the invasion of smoke and preventing the invasion of external light are kept at appropriate intervals is formed around the wall.
【0012】図2は第1の外乱遮光用支柱3の詳細構造
を示しており、受光部2に面した側面には、細い複数の
縦溝31aを形成して、光トラップ面31を形成してお
り、この面31に当たった光は、反射が抑えられ、吸収
される構造としている。このような光トラップ面31
は、縦溝に代えて、細かい凹凸面を形成した粗面にして
もよい。FIG. 2 shows a detailed structure of the first disturbance light shielding column 3, in which a plurality of narrow vertical grooves 31a are formed on the side surface facing the light receiving section 2 to form an optical trapping surface 31. The light striking the surface 31 has a structure in which reflection is suppressed and absorbed. Such an optical trapping surface 31
May be a rough surface formed with fine irregularities instead of the vertical grooves.
【0013】図3,4は本発明の光電式煙感知器の感知
器ヘッドを各部品に分解した斜視図、図5は感知器ヘッ
ドの縦断面構造図を示している。光学室10は、図3に
示したように、発光素子となるLEDLをリード81を
介して実装し、更に受光素子となるPDを面実装した回
路基板8に、発光素子収容部となる発光部カバー51
と、プリズム収容部52とを、各々の光軸が前述したよ
うに同一の水平面上に位置するように対設させ、更にそ
の間に上記した外乱遮光用支柱3を突設した光学基台5
を、その上方より被せて構成されている。このような光
学室10には、周囲にラビリンス壁41を形成し、一端
を開口させたラビリンス筒体4を被せて煙感知室Sを、
図4に示したように構成し、このようにして構成した煙
感知室Sの裏面に取り付けられた回路基板8の接続孔
(不図示)を、感知器ヘッド7の内窪部72に突設した
接続ピン71に嵌入接続して、煙感知室Sを感知器ヘッ
ド7に取り付けてから、煙感知室Sを防虫網61を取り
付けた保護ゲージ6で覆うようにして、保護ケージ6
を、図5に示したように感知器ヘッド7に嵌合接続させ
て感知器ヘッドが構成される。この図では、感知ベース
は示されていないが、天井面などに取り付けられた感知
ベースに、感知器ヘッド7をツイスト嵌合させるなどの
方法で天井面に取り付けて使用される。FIGS. 3 and 4 are exploded perspective views of the sensor head of the photoelectric smoke sensor according to the present invention, and FIG. 5 is a longitudinal sectional structural view of the sensor head. As shown in FIG. 3, the optical chamber 10 is provided with a light emitting element serving as a light emitting element housing part on a circuit board 8 on which an LEDL serving as a light emitting element is mounted via a lead 81 and a PD serving as a light receiving element is surface mounted. Cover 51
And the prism housing 52 such that the respective optical axes are located on the same horizontal plane as described above, and furthermore, the optical base 5 on which the above-mentioned disturbance light shielding column 3 is projected.
Is covered from above. In such an optical chamber 10, a labyrinth wall 41 is formed around the optical chamber 10, and a labyrinth cylindrical body 4 having one end opened is covered to form a smoke sensing chamber S,
A connection hole (not shown) of the circuit board 8 configured as shown in FIG. 4 and attached to the back surface of the smoke detection chamber S configured as described above protrudes into the inner recess 72 of the sensor head 7. The smoke detecting chamber S is attached to the sensor head 7 and then the smoke detecting chamber S is covered with the protective gauge 6 to which the insect net 61 is attached.
Are fitted and connected to the sensor head 7 as shown in FIG. 5 to form a sensor head. In this figure, the sensing base is not shown, but is used by being attached to the ceiling surface by a method such as twist-fitting the sensor head 7 to the sensing base attached to the ceiling surface or the like.
【0014】図6は、請求項5において提案された第2
の外乱遮光用支柱9を示しており、このような外乱遮光
用支柱9は、上記した第1の外乱遮光用支柱3よりも発
光部1に近い側で、受光部2から見たときには第1の外
乱遮光用支柱3の陰に隠れ、かつ受光部2に対向するラ
ビリンス壁41からの反射光が発光部2へ直接入光しな
い位置に突設されている。FIG. 6 shows a second embodiment proposed in claim 5.
And the disturbance light-shielding column 9 is located closer to the light emitting unit 1 than the first disturbance light-shielding column 3 and is in the first position when viewed from the light-receiving unit 2. The light-shielding column 3 protrudes from the labyrinth wall 41 facing the light-receiving unit 2 and does not directly enter the light-emitting unit 2.
【0015】図では、光学基台5の発光素子収容部を構
成する発光部カバー51に形成した光放出孔11から受
光部2と対向するラビリンス壁41への投射光が遮光さ
れ、かつ、煙感知室4のその他のラビリンス壁41から
受光部2と対向するラビリンス壁からの反射光が受光部
2に入光しないように、外乱遮光用支柱3の陰になる位
置に形成されている。その形状や寸法は任意であるが、
遮光スクリーンの作用をなすためには寸法は出来るだけ
長いものが好ましい。In the figure, the light projected from the light emitting hole 11 formed in the light emitting portion cover 51 constituting the light emitting element housing portion of the optical base 5 to the labyrinth wall 41 facing the light receiving portion 2 is shielded, and It is formed in a position behind the disturbance light shielding column 3 so that the reflected light from the labyrinth wall facing the light receiving unit 2 from the other labyrinth wall 41 of the sensing chamber 4 does not enter the light receiving unit 2. Its shape and dimensions are arbitrary,
In order to function as a light-shielding screen, it is preferable that the dimension be as long as possible.
【0016】図7は、第2の外乱遮光用支柱2による遮
光効果を説明するもので、第2の外乱遮光用支柱3を設
けたものでは、ラビリンス壁41の受光部2と対向する
部分Aからの反射光が受光部2へ直接入光されないよう
にできる。すなわち、ラビリンス壁41のA部分から受
光部2に直接入光する光ルートを考えると、発光部2か
ら直進した光束P1が対向するラビリンス壁で反射し、
更にA部分に直進するルートP2と、発光部1の光放出
孔11の縁端からラビリンス壁のA部分に直進するルー
トP3が存在するが、上記した第2の外乱遮光用支柱9
を設けたものでは、これらの光ルートを通じてA部分か
ら反射する光経路が遮断されるため、受光部2は、対向
する部分Aからの反射光を受けることがなくなる。FIG. 7 illustrates the light-shielding effect of the second disturbance light-shielding column 2. In the case where the second disturbance light-shielding column 3 is provided, a portion A of the labyrinth wall 41 that faces the light receiving section 2 is shown in FIG. Reflected light from the light receiving unit 2 can be prevented from directly entering the light receiving unit 2. That is, considering a light route that directly enters the light receiving unit 2 from the portion A of the labyrinth wall 41, the light flux P1 that has traveled straight from the light emitting unit 2 is reflected by the opposing labyrinth wall,
Further, there is a route P2 that goes straight to the portion A and a route P3 that goes straight from the edge of the light emission hole 11 of the light emitting portion 1 to the portion A of the labyrinth wall.
Is provided, the light path reflected from the portion A through these light routes is blocked, so that the light receiving section 2 does not receive the reflected light from the opposing portion A.
【0017】従来の煙感知器では、受光部に対向したラ
ビリンス壁面からの入光を避けるために、発光部からの
投射光を絞るため、発光部を図8に示したように、発光
素子Lを第1、第2の絞り201,202を設けた暗ボ
ックス200内に収容する構造にしたり、図9に示した
ように、発光素子Lを絞り203を設けた暗ボックス2
04内に収容して、レンズ205で投光をビーム状に絞
るなどの工夫がなされているが、本発明では、発光部を
複雑な構造にしなくても、第2の外乱遮光用支柱を設け
るだけでよく、構造を簡易化できる。In the conventional smoke detector, in order to avoid light entering from the labyrinth wall facing the light receiving section, the light emitting section is formed as shown in FIG. May be accommodated in a dark box 200 provided with first and second apertures 201 and 202, or as shown in FIG.
Although the light emitting unit is housed in the light receiving unit 04 and the light emitted from the lens 205 is narrowed down into a beam shape by the lens 205, the second disturbance light shielding column is provided in the present invention without a complicated structure of the light emitting unit. And the structure can be simplified.
【0018】[0018]
【発明の効果】以上の説明より理解されるように本発明
の光電式煙感知器によれば、次のような効果が奏され
る。請求項1,2,3によれば、煙による散乱光以外の
受光素子への入光が一層低減できるので、温度変化等の
環境変化に強い薄型の煙感知器が得られる。As will be understood from the above description, the photoelectric smoke detector of the present invention has the following effects. According to the first, second, and third aspects, light incident on the light receiving element other than the scattered light due to smoke can be further reduced, so that a thin smoke detector that is resistant to environmental changes such as temperature changes can be obtained.
【0019】請求項4によれば、受光素子は回路基板に
面実装された構造となっているので、温度変化等の環境
変化に加えて、電気的ノイズにも強い薄型の煙感知器が
得られる。請求項5,6によれば、発光部の構造を簡易
にしたままで、ラビリンス壁からの反射光を直接に受光
部に入光させない簡易で安価な構造に出来る。According to the fourth aspect, since the light receiving element is structured to be surface-mounted on the circuit board, a thin smoke detector which is resistant to electric noise in addition to environmental changes such as temperature changes can be obtained. Can be According to the fifth and sixth aspects, it is possible to provide a simple and inexpensive structure that does not allow the reflected light from the labyrinth wall to directly enter the light receiving unit while keeping the structure of the light emitting unit simple.
【0020】請求項7によれば、発光部と受光部とを、
それぞれの光軸が同一水平面上に位置するように配置し
たとき、感度を低下させることがなく、外乱の影響も少
ない薄型の煙感知器が提供できる。According to the seventh aspect, the light emitting section and the light receiving section are
When the respective optical axes are arranged so as to be located on the same horizontal plane, it is possible to provide a thin smoke detector which does not lower the sensitivity and is less affected by disturbance.
【図1】本発明の光電式煙感知器の煙感知室内における
発光部と受光部の配置関係を示す図である。FIG. 1 is a diagram showing an arrangement relationship between a light emitting unit and a light receiving unit in a smoke sensing room of a photoelectric smoke detector according to the present invention.
【図2】第1の外乱遮光用支柱の拡大図である。FIG. 2 is an enlarged view of a first disturbance light shielding column.
【図3】本発明の光電式煙感知器の感知器ヘッドにおけ
る光学室とラビリンス筒体の分解斜視図である。FIG. 3 is an exploded perspective view of an optical chamber and a labyrinth cylinder in the sensor head of the photoelectric smoke detector according to the present invention.
【図4】本発明の光電式煙感知器の感知器ヘッドと煙感
知室を示す分解斜視図である。FIG. 4 is an exploded perspective view showing a sensor head and a smoke detection chamber of the photoelectric smoke detector according to the present invention.
【図5】本発明の光電式煙感知器の感知器ヘッドの縦断
面構造図である。FIG. 5 is a vertical sectional structural view of a sensor head of the photoelectric smoke detector of the present invention.
【図6】第2の外乱遮光用支柱の一例を示す説明図であ
る。FIG. 6 is an explanatory view showing an example of a second disturbance light shielding column.
【図7】第2の外乱遮光用支柱の遮光効果の説明図であ
る。FIG. 7 is an explanatory diagram of a light shielding effect of a second disturbance light shielding column.
【図8】第2の外乱遮光用支柱を設けない場合における
従来の感知器における発光部の構造説明図である。FIG. 8 is a structural explanatory view of a light emitting unit in a conventional sensor in a case where a second disturbance light shielding column is not provided.
【図9】第2の外乱遮光用支柱を設けない場合における
従来の感知器における発光部の別の構造説明図である。FIG. 9 is another structural explanatory view of a light emitting unit in a conventional sensor in a case where a second disturbance light shielding column is not provided.
【図10】従来の薄型化を図った煙感知器の発光部と受
光部の配置関係を示す図である。FIG. 10 is a diagram showing an arrangement relationship between a light-emitting unit and a light-receiving unit of a conventional smoke sensor that has been made thinner.
【図11】常温時における外乱ノイズと煙濃度の変化を
示す受光素子の出力特性図である。FIG. 11 is an output characteristic diagram of a light receiving element showing a change in disturbance noise and smoke density at normal temperature.
【図12】周囲温度が上昇した時における外乱ノイズと
煙濃度の変化を示す受光素子の出力特性図である。FIG. 12 is an output characteristic diagram of the light receiving element showing disturbance noise and changes in smoke density when the ambient temperature increases.
1 発光部 2 受光部 3 第1の外乱遮光用支柱 31 光トラップ面 31a 光トラップ溝 L 発光素子(LED) PD 受光素子 S 煙感知室 4 ラビリンス筒体 41 ラビリンス壁 5 光学基台 51 発光部カバー(発光素子収容部) 52 プリズム収容部 6 保護ケージ 7 感知器ヘッド 8 回路基板 9 第2の外乱遮光用支柱 10 光学室 L1 発光部の光軸 L2 受光部の光軸 θ 所定の角度 DESCRIPTION OF SYMBOLS 1 Light-emitting part 2 Light-receiving part 3 1st disturbance light shielding support | pillar 31 Optical trap surface 31a Optical trap groove L Light-emitting element (LED) PD light-receiving element S Smoke sensing room 4 Labyrinth cylinder 41 Labyrinth wall 5 Optical base 51 Light-emitting part cover (Light emitting element housing part) 52 Prism housing part 6 Protective cage 7 Sensor head 8 Circuit board 9 Second disturbance light shielding column 10 Optical chamber L1 Optical axis of light emitting part L2 Optical axis of light receiving part θ Predetermined angle
───────────────────────────────────────────────────── フロントページの続き (72)発明者 下村 茂樹 大阪府門真市大字門真1048番地 松下電 工株式会社内 (56)参考文献 特開 平7−121785(JP,A) 特開 平7−72075(JP,A) 特開 平7−182584(JP,A) 特開 平5−303697(JP,A) 実開 昭55−81749(JP,U) (58)調査した分野(Int.Cl.7,DB名) G08B 17/107 G01N 21/53 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigeki Shimomura 1048 Odakadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works, Ltd. (56) References JP-A-7-121785 (JP, A) JP-A-7-72075 (JP, a) JP flat 7-182584 (JP, a) JP flat 5-303697 (JP, a) JitsuHiraku Akira 55-81749 (JP, U) (58 ) investigated the field (Int.Cl. 7 , DB name) G08B 17/107 G01N 21/53
Claims (7)
受光素子側に光路を変更させ、集光させるプリズムレン
ズを設けた受光部とを、それぞれの光軸が同一水平面上
で所定の角度をもって対設し、発光部と受光部との間に
は発光部から受光部への直接の入光を遮光する第1の外
乱遮光用支柱を突設するとともに、周囲にはラビリンス
壁を形成した煙感知室を有した光電式煙感知器におい
て、 上記第1の外乱遮光用支柱の受光部側には光トラップ面
を形成した構造とした光電式煙感知器。A light emitting unit provided with a light emitting element such as an LED;
The light path is changed on the light receiving element side, and a light receiving section provided with a prism lens for condensing light is opposed to the light axis at a predetermined angle on the same horizontal plane, and light is emitted between the light emitting section and the light receiving section. A first disturbance light shielding column for shielding light directly entering the light receiving unit from the light receiving unit, and a photoelectric smoke sensor having a smoke sensing chamber having a labyrinth wall formed around the first disturbance light shielding column. The photoelectric smoke detector has a structure in which a light trapping surface is formed on the light receiving portion side of the disturbance light shielding column.
プ溝を形成した構造としている光電式煙感知器。2. The photoelectric smoke sensor according to claim 1, wherein the light trapping surface has a structure in which a light trapping groove formed by a plurality of vertical grooves is formed.
ている光電式煙感知器。3. The photoelectric smoke detector according to claim 1, wherein the light trapping surface has a structure formed by roughening.
素子収容部と、受光素子側に光路を変更させ、集光する
プリズムレンズを収容するプリズム収容部とを対設した
光学基台と、受光素子を面実装するとともに、LEDな
どの発光素子を実装した回路基板と、ラビリンス壁を周
囲に形成し、一方を開口させたラビリンス筒体とを組み
合わせて構成されている光電式煙感知器。4. The smoke sensing chamber according to claim 1, wherein the smoke sensing chamber includes a light emitting element housing for housing a light emitting element such as an LED, and a prism for housing a prism lens for changing the optical path to the light receiving element and condensing light. An optical base having a housing and a light-receiving element mounted on the surface, a circuit board on which a light-emitting element such as an LED is mounted, and a labyrinth cylinder having a labyrinth wall formed on one side and an opening on one side. A photoelectric smoke detector configured in combination.
記第1の外乱遮光用支柱の陰に隠れ、かつ発光部から受
光部に対向するラビリンス壁に投射される光経路が形成
されないように、第2の外乱遮光用支柱を更に突設した
構造とした光電式煙感知器。5. A labyrinth in the vicinity of the light emitting portion, which is hidden behind the first disturbance light shielding column when viewed from the light receiving portion, and which faces the light receiving portion from the light emitting portion. A photoelectric smoke detector having a structure in which a second disturbance light shielding column is further protruded so that a light path projected on a wall is not formed.
記ラビリンス壁側に延びるようにして突設されている光
電式煙感知器。6. The photoelectric smoke sensor according to claim 5, wherein the second disturbance light shielding column is protruded from the vicinity of the light emitting section toward the labyrinth wall.
0度から140度の範囲である光電式煙感知器。7. The method according to claim 1, wherein the predetermined angle at which the light emitting section and the light receiving section are opposed to each other is 12 °.
A photoelectric smoke detector that ranges from 0 degrees to 140 degrees.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP03801496A JP3338608B2 (en) | 1996-02-26 | 1996-02-26 | Photoelectric smoke detector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP03801496A JP3338608B2 (en) | 1996-02-26 | 1996-02-26 | Photoelectric smoke detector |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH09231485A JPH09231485A (en) | 1997-09-05 |
JP3338608B2 true JP3338608B2 (en) | 2002-10-28 |
Family
ID=12513729
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP03801496A Expired - Fee Related JP3338608B2 (en) | 1996-02-26 | 1996-02-26 | Photoelectric smoke detector |
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JP (1) | JP3338608B2 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4405522B2 (en) | 2007-03-07 | 2010-01-27 | シャープ株式会社 | Photoelectric smoke sensor and lighting equipment |
AU2008264607B2 (en) * | 2007-06-18 | 2012-02-02 | Panasonic Corporation | Smoke sensor |
JP5325397B2 (en) * | 2007-06-19 | 2013-10-23 | パナソニック株式会社 | smoke detector |
JP5379369B2 (en) * | 2007-10-31 | 2013-12-25 | 新コスモス電機株式会社 | Photoelectric smoke detector |
JP5022322B2 (en) * | 2008-08-25 | 2012-09-12 | パナソニック株式会社 | Inter-chip terminal connection method, circuit board manufactured using the same, and fire detector including the circuit board |
JP5606123B2 (en) * | 2010-03-31 | 2014-10-15 | 能美防災株式会社 | Photoelectric smoke detector |
CN109166268B (en) * | 2018-10-19 | 2020-10-27 | 浙江巨感物联网科技有限公司 | A advance cigarette maze and smoke detector for smoke detector |
CN113533149B (en) * | 2020-04-15 | 2024-06-07 | 杭州海康消防科技有限公司 | Detection device welding packaging module of photoelectric smoke detector and labyrinth assembly |
-
1996
- 1996-02-26 JP JP03801496A patent/JP3338608B2/en not_active Expired - Fee Related
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JPH09231485A (en) | 1997-09-05 |
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