JP4668702B2 - Fire detector - Google Patents

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JP4668702B2
JP4668702B2 JP2005191623A JP2005191623A JP4668702B2 JP 4668702 B2 JP4668702 B2 JP 4668702B2 JP 2005191623 A JP2005191623 A JP 2005191623A JP 2005191623 A JP2005191623 A JP 2005191623A JP 4668702 B2 JP4668702 B2 JP 4668702B2
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light
light guide
guide member
light emitting
dark box
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JP2007011684A (en
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泰徳 大矢
和義 桜井
丈司 上野
竜一 山崎
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Nittan Co Ltd
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Nittan Co Ltd
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Description

本発明は、建造物内で用いる火災感知器に関する。   The present invention relates to a fire detector used in a building.

従来の火災感知器は、火災感知を行う素子や回路を内蔵すると共に建造物の設置状態において正面となる側が凸状に形成された筐体と、当該筐体内の回路に接続された火災感知の作動状態を発光して示す発光素子と、発光素子の発する光を筐体の外部まで伝達する光ガイド部材とを備えていた(例えば、特許文献1参照)。
実公昭61−1511号公報
Conventional fire detectors have built-in fire detection elements and circuits, and a housing with a convex shape on the front side in the installed state of the building, and a fire detection device connected to the circuits in the housing. A light-emitting element that emits light indicating an operating state and a light guide member that transmits light emitted from the light-emitting element to the outside of the housing (for example, see Patent Document 1).
Japanese Utility Model Publication No. 61-1511

しかしながら、上記従来例にあっては、筐体内部で正面側に向けられた発光素子に対して真っ直ぐに光伝達を行う円柱状の光ガイド部材を使用しているので、筐体内部の発光素子の配置がそのまま筐体外部の発光位置に反映されてしまうという不都合があった。
つまり、円柱状の光ガイド部材は発光素子の光軸に沿って筐体の正面の壁面を貫通して配置され、筐体外部に露出された端面により発光素子からの光を外部に照射していた。
一方、筐体は正面側が凸状であると共にその中央部が最も凸状となり、発光素子の配置に応じて光ガイド部材の配置が筐体の最も凸なる中央部から外れて配置されてしまうと、火災感知器の周囲の一部の範囲からは筐体の凸状中央部に隠れて作動状態を示す照射光が見えなくなってしまうという不都合が生じていた。
However, in the above-described conventional example, a cylindrical light guide member that transmits light straight to the light emitting element directed to the front side inside the casing is used, so the light emitting element inside the casing is used. There is a disadvantage that the arrangement is reflected as it is in the light emitting position outside the housing.
In other words, the cylindrical light guide member is disposed through the front wall surface of the casing along the optical axis of the light emitting element, and radiates light from the light emitting element to the outside through the end surface exposed to the outside of the casing. It was.
On the other hand, the housing has a convex shape on the front side and the center portion thereof is the most convex shape, and the arrangement of the light guide member is deviated from the most convex center portion of the housing according to the arrangement of the light emitting elements. From the partial area around the fire detector, there is a disadvantage that the irradiation light indicating the operating state is hidden behind the convex central part of the casing.

また、筐体内の発送素子の配置の影響を受けないように、光ガイド部材を延長し、或いは屈曲形成すると、光ガイド部材の内部で光が減衰し、筐体外部では発光の光量が低減して、やはり作動状態の確認が困難となるという問題もあった。
また、火災感知手段が光源と受光素子とを用いて煙による散乱光を感知するいわゆる煙感知式である場合には、筐体内部に外部光の影響を受けないように、暗箱を設ける必要が生じるが、前述した光ガイド部材との干渉も考慮しなければならず、暗箱と光ガイド部材との干渉を避ける配置とすることが筐体の大型化を招いてしまうという問題も生じていた。
Also, if the light guide member is extended or bent so that it is not affected by the arrangement of the shipping elements in the housing, the light is attenuated inside the light guide member, and the amount of emitted light is reduced outside the housing. Also, there was a problem that it was difficult to confirm the operating state.
In addition, if the fire detection means is a so-called smoke detection type that detects light scattered by smoke using a light source and a light receiving element, it is necessary to provide a dark box inside the housing so as not to be affected by external light. However, the above-described interference with the light guide member has to be taken into account, and there has been a problem that the arrangement that avoids the interference between the dark box and the light guide member leads to an increase in the size of the housing.

本発明は、火災感知器の周囲全域から作動確認を可能とすることをその目的とする。
また、本発明は、火災感知器の作動確認をより確実に可能とすることを他の目的とする。
さらに、本発明は、火災感知器の小型化をさらに他の目的とする。
It is an object of the present invention to make it possible to confirm the operation from the entire area around the fire detector.
Another object of the present invention is to make it possible to confirm the operation of the fire detector more reliably.
Another object of the present invention is to reduce the size of the fire detector.

請求項1記載の発明は、正面中央部が凸状に形成され、火災感知手段を内蔵する筐体と、筐体内で点灯して火災感知手段の作動状態を示す光源と、光源が発する光を、内部の光透過により筐体の正面中央部の凸状の先端位置の中央部まで伝達する光ガイド部材とを備え、光ガイド部材は、平板状に形成された部分を備えると共に、当該平板の一方の平面に設けられた透過光射出用の発光面と、他方の平面に傾斜して設けられた発光面に対向する傾斜面とを有し、傾斜面に、内部透過光を発光面側に反射するための反射面を形成する複数の溝を形成する、という構成を採っている。 The invention according to claim 1 is characterized in that the front center portion is formed in a convex shape, and a housing containing the fire detection means, a light source that lights in the housing and indicates the operating state of the fire detection means, and light emitted from the light source. A light guide member that transmits to the center of the convex tip position of the front central portion of the housing by light transmission inside, the light guide member includes a portion formed in a flat plate shape, It has a light emitting surface for emitting transmitted light provided on one plane and an inclined surface facing the light emitting surface provided inclined on the other plane, and internally transmitted light is directed to the light emitting surface side on the inclined surface. A configuration is adopted in which a plurality of grooves forming a reflecting surface for reflection are formed.

筐体における「正面」とは、筐体を壁や天井などの設置面に取り付ける場合に、当該設置面と対向する面の逆側の面のことを示すものとし、以下の記載において全て同様とする。
上記構成では、火災感知手段の作動中には光源が発光し、光ガイド部材は、光源からの光を受光して内部で透過させながら平板状の部分まで導く。そして、透過光を傾斜面の各溝により形成された無数の反射面により発光面側に反射させ、筐体正面中央部の発光面から筐体の外部に向かって発光する。
“Front” in a case means a surface opposite to the surface facing the installation surface when the case is attached to an installation surface such as a wall or a ceiling. To do.
In the above configuration, the light source emits light during the operation of the fire detection means, and the light guide member receives the light from the light source and guides it to the plate-shaped portion while transmitting the light inside. Then, the transmitted light is reflected to the light emitting surface side by an infinite number of reflecting surfaces formed by the grooves on the inclined surface, and emitted from the light emitting surface at the central front portion of the housing toward the outside of the housing.

なお、光源は点灯することにより火災感知手段における何らかの作動状態を示す機能を有するが、その作動状態については特定されるものではない。例えば、現在、火災感知を実行中であることを示したり、バッテリーの充足或いは不足状態を示したり、火災を感知してそれを報知するために点灯して示すものであっても良い。   Note that the light source has a function of indicating some operating state of the fire detection means by turning on the light, but the operating state is not specified. For example, it may indicate that the fire detection is currently being executed, indicate whether the battery is full or insufficient, or turn on to indicate a fire and notify it.

請求項2記載の発明は、請求項1記載の発明と同様の構成を備えると共に、発光面に対して垂直に傾斜面を投影した場合に、当該投影された傾斜面が発光面全域に重合すると共に発光面よりも面積が大きくなるように、光ガイド部材の傾斜面が形成されている、という構成を採っている。   The invention according to claim 2 has the same configuration as that of the invention according to claim 1, and when the inclined surface is projected perpendicularly to the light emitting surface, the projected inclined surface is superposed on the entire light emitting surface. In addition, an inclined surface of the light guide member is formed so that the area is larger than the light emitting surface.

上記構成では、投影された傾斜面が発光面全域に重合し、且つ投影された傾斜面が発光面よりも面積が大きく設定されている。このため、傾斜面の全範囲に渡って複数のV字溝が形成されることにより、発光面よりも広範囲から反射光が発光されることとなり、発光面の正面以外の方向から見ても、発光面の全体が発光して見える。   In the above configuration, the projected inclined surface overlaps the entire light emitting surface, and the projected inclined surface is set to have a larger area than the light emitting surface. For this reason, by forming a plurality of V-shaped grooves over the entire range of the inclined surface, reflected light is emitted from a wider range than the light emitting surface, and even when viewed from a direction other than the front of the light emitting surface, The entire light emitting surface appears to emit light.

請求項3記載の発明は、正面中央部が凸状に形成され、火災感知手段を内蔵する筐体と、筐体内で点灯して前記火災感知手段の作動状態を示す光源と、光源が発する光を、内部の光透過により筐体の正面中央部の凸状の先端位置の中央部まで伝達する光ガイド部材とを備え、火災感知手段は、外部光を遮断する暗箱内に設けられ、当該暗箱内に侵入した煙による散乱光を検出して火災感知を行うと共に、暗箱に、当該暗箱を貫通して形成された光を透過しない管状の光ガイド部材の挿通部を設ける、という構成を採っている。 According to a third aspect of the present invention, a front central part is formed in a convex shape, a housing containing a fire detection means, a light source that lights in the housing and indicates an operating state of the fire detection means, and light emitted from the light source And a light guide member that transmits light to the central portion of the convex tip position of the front central portion of the housing by light transmission inside, and the fire detection means is provided in a dark box that blocks external light, and the dark box A configuration is adopted in which a scattered light from smoke that has entered inside is detected to detect a fire, and a dark box is provided with an insertion portion of a tubular light guide member that does not transmit light formed through the dark box. Yes.

上記構成では、外乱光の影響を排除するための暗箱を備えた場合において、光ガイド部材を挿通する光を透過しない管状の挿通部を設けたので、暗箱を迂回して光ガイド部材を配置するスペースを不要とし、光ガイド部材の迂回自体を不要とする。   In the above configuration, when the dark box for eliminating the influence of disturbance light is provided, the tubular insertion portion that does not transmit the light that passes through the light guide member is provided, and thus the light guide member is arranged around the dark box. Space is not required, and the bypass of the light guide member itself is unnecessary.

請求項4記載の発明は、請求項3記載の発明と同様の構成を備えると共に、光ガイド部材は、暗箱の外壁と筐体の内壁との間に挟んで固定される、という構成を採っている。
上記構成では、光ガイド部材を暗箱の外壁と筐体の内壁との間に挟んで固定するため、火災感知器の組み立ての際には、暗箱を筐体内に設置する際に、光ガイド部材の設置作業が同時に行われる。
なお、光ガイド部材を挟持する暗箱の外壁と筐体の内壁について、光ガイド部材の表面に正対する部分については、その表面の光反射性を高くする処理を行うことが望ましい。
The invention described in claim 4 has the same configuration as that of the invention described in claim 3, and the light guide member is fixed between the outer wall of the dark box and the inner wall of the housing. Yes.
In the above configuration, since the light guide member is sandwiched and fixed between the outer wall of the dark box and the inner wall of the housing, when assembling the fire detector, when installing the dark box in the housing, Installation work is performed simultaneously.
For the outer wall of the dark box that holds the light guide member and the inner wall of the housing, it is desirable to perform a process for increasing the light reflectivity of the surface of the portion that faces the surface of the light guide member.

請求項1記載の発明は、光ガイド部材が、傾斜面に形成された複数の溝の反射により発光面からの発光を可能とするので、筐体における外部への発光位置が光源の光軸正面位置に限定されず、筐体の正面中央部である凸状先端位置から発光させることができる。つまり、凸状の先端位置からの発光により、筐体の全周から作動状態を確認することが可能となる。
また、各溝は傾斜面に形成されているので、平板状の部分を透過する光の進行方向に対して後方に位置する溝も前方の溝に遮られることなく光反射を行うことができる。このため、光ガイド部材は、光の減衰や損失を抑え、透過光を効率的に発光面まで伝達するので、より高い光強度で発光することができ、より確実に、作動状態を確認することが可能となる。
According to the first aspect of the present invention, since the light guide member can emit light from the light emitting surface by reflection of the plurality of grooves formed on the inclined surface, the light emitting position to the outside in the housing is the front surface of the optical axis of the light source. It is not limited to the position, and light can be emitted from the convex tip position that is the front center of the housing. That is, the operating state can be confirmed from the entire circumference of the housing by light emission from the convex tip position.
In addition, since each groove is formed on an inclined surface, the groove positioned rearward with respect to the traveling direction of the light transmitted through the flat plate portion can reflect light without being blocked by the front groove. For this reason, the light guide member suppresses attenuation and loss of light and efficiently transmits the transmitted light to the light emitting surface. Therefore, the light guide member can emit light with higher light intensity, and confirm the operating state more reliably. Is possible.

請求項2記載の発明は、発光面側に投影させた傾斜面が発光面全体に重合し且つ広面積なので、発光面の正面以外の方向から見ても発光面全体が発光しているように見せることができ、筐体の全周からより良好に作動状態を確認することが可能となる。   In the invention according to claim 2, since the inclined surface projected on the light emitting surface side overlaps with the entire light emitting surface and has a large area, the entire light emitting surface emits light even when viewed from a direction other than the front surface of the light emitting surface. It can be shown, and the operating state can be confirmed better from the entire circumference of the housing.

請求項3記載の発明は、筐体の正面中央部である凸状先端位置から発光させることができるので、筐体正面におけるの全周から作動状態を確認することが可能となる。
さらに、本発明は、暗箱に光ガイド部材を挿通する光を透過しない管状の挿通部を設けたので、暗箱を迂回して光ガイド部材を配置するスペースを不要とすることができ、火災感知器の小型化を図ることが可能となる。
さらに、光ガイド部材の迂回自体を不要とするため、光源から発光部までの光の減衰を抑制し、より高い光強度で発光することができ、より確実に、作動状態を確認することが可能となる。
According to the third aspect of the present invention, since the light can be emitted from the convex tip position that is the front central portion of the housing, the operating state can be confirmed from the entire circumference in the front of the housing.
Furthermore, the present invention is provided with a tubular insertion portion that does not transmit the light that passes through the light guide member in the dark box, so that a space for arranging the light guide member around the dark box can be eliminated, and the fire detector It becomes possible to achieve downsizing.
Furthermore, since the detouring of the light guide member itself is not required, the attenuation of light from the light source to the light emitting part can be suppressed, light can be emitted with higher light intensity, and the operating state can be confirmed more reliably. It becomes.

請求項4記載の発明は、光ガイド部材を暗箱の外壁と筐体の内壁との間に挟んで固定するため、火災感知器の組み立てにおいて、暗箱を筐体内に設置する際に、光ガイド部材の配置が同時に行われ、別個独立した光ガイド部材の組み上げを不要とすることができる。また、光ガイド部材は挟持されて保持されるので、光ガイド部材専用の固定手段や固定構造を排除又は簡略化することができ、火災感知器の生産性の向上を図ることが可能となる。   In the invention according to claim 4, since the light guide member is sandwiched and fixed between the outer wall of the dark box and the inner wall of the casing, the light guide member is used when the dark box is installed in the casing in the assembly of the fire detector. Are arranged at the same time, and it is possible to eliminate the need for assembling separate light guide members. Further, since the light guide member is held and held, it is possible to eliminate or simplify the fixing means and the fixing structure dedicated to the light guide member, and it is possible to improve the productivity of the fire detector.

(火災感知器の全体構成)
本発明の実施形態である火災感知器10について図1乃至図10を参照して説明する。図1は火災感知器10の正面側を示す斜視図、図2は背面側を示す斜視図、図3は分解斜視図である。
火災感知器10は、建造物の屋内の天井や壁面に設置され、火災により生じる煙を感知することで警報による報知を行うものである。
ここで以下の説明において、火災感知器10の設置に際して、建造物の天井の平面或いは壁面に対向する面を火災感知器10の背面とし、その逆側の面を火災感知器10の正面ということとする。
また、以下の説明において上記正面側に向かう方向を前方、背面側に向かう方向を後方として説明を行うこととする。
(Overall configuration of fire detector)
A fire detector 10 according to an embodiment of the present invention will be described with reference to FIGS. 1 is a perspective view showing the front side of the fire detector 10, FIG. 2 is a perspective view showing the back side, and FIG. 3 is an exploded perspective view.
The fire detector 10 is installed on an indoor ceiling or wall surface of a building, and performs alarm notification by detecting smoke generated by a fire.
Here, in the following description, when the fire detector 10 is installed, the plane facing the ceiling or wall surface of the building is the back surface of the fire detector 10, and the opposite surface is the front surface of the fire detector 10. And
In the following description, the direction toward the front side will be described as the front, and the direction toward the back side will be described as the rear.

火災感知器10は、図3に示すように、火災発生時の煙を感知する煙感知手段20(図8参照)と、煙感知手段20を格納する暗箱30と、煙感知手段20の感知により図示しない警報ブザーを鳴らすための回路が主に構成されている回路基板40と、この回路基板40に設けられると共に火災感知手段としての煙感知手段20の作動状態を点灯により示す光源としてのLED41と、上記各構成を内蔵する筐体50と、LED41が発する光を筐体50の正面中央部の発光位置である作動表示部73dまで伝達する光ガイド部材90とを備えている。
以下、各部について順番に詳説することにする。
As shown in FIG. 3, the fire detector 10 includes smoke detection means 20 (see FIG. 8) that detects smoke when a fire occurs, a dark box 30 that stores the smoke detection means 20, and detection by the smoke detection means 20. A circuit board 40 mainly comprising a circuit for sounding an alarm buzzer (not shown), and an LED 41 as a light source which is provided on the circuit board 40 and indicates the operation state of the smoke sensing means 20 as a fire sensing means by lighting. The housing 50 includes the above-described components, and a light guide member 90 that transmits light emitted from the LED 41 to the operation display unit 73d that is a light emission position at the front center of the housing 50.
Hereinafter, each part will be described in detail.

(筐体)
図4は図1に示すX−X線に沿った火災感知器10の断面図である。図1乃至図4に基づいて筐体50について説明する。
図3及び図4に示すように、筐体50は、主として、背面側に位置する円形のベース体60と、正面側に位置する円形のカバー体70と、ベース体60とカバー体70と連結すると共に筐体50の内部を正面側と背面側の二つの区域に分ける仕切板75とから構成されている。
(Casing)
4 is a cross-sectional view of the fire detector 10 taken along line XX shown in FIG. The housing 50 will be described with reference to FIGS.
As shown in FIGS. 3 and 4, the housing 50 is mainly connected to a circular base body 60 located on the back side, a circular cover body 70 located on the front side, and the base body 60 and the cover body 70. And a partition plate 75 that divides the interior of the housing 50 into two sections, a front side and a back side.

カバー体70は、円形の正面部71と、正面部71の周縁部から連なる側壁面を構成をする円筒部72と、正面部71の中央部に設けられた略円筒状の凸状部73とを有し、これらは白色の樹脂材料にて一体成形で作られている。
上記凸状部73は、正面部71に対して同心に配置されると共に当該正面部71よりも小径な皿状の天板73aと、天板73aと正面部71とを連結する四つのリブ73bとを有している。
The cover body 70 includes a circular front part 71, a cylindrical part 72 that forms a side wall surface that extends from the peripheral part of the front part 71, and a substantially cylindrical convex part 73 provided at the center of the front part 71. These are made by integral molding with a white resin material.
The convex portion 73 is arranged concentrically with respect to the front portion 71 and has a dish-shaped top plate 73a having a smaller diameter than the front portion 71, and four ribs 73b connecting the top plate 73a and the front portion 71. And have.

リブ73bは、天板73aの周縁部において四本が均一間隔で設けられ、各リブ73b同士の間は広く開口している。図4に示すように、凸状部73の内側には、煙感知手段20を格納する暗箱30が配置されるため、各リブ73bの間を開口部73cとすることで暗箱30内に煙を導きやすい構造となっている。   Four ribs 73b are provided at regular intervals at the peripheral edge of the top plate 73a, and the ribs 73b are widely open. As shown in FIG. 4, since the dark box 30 for storing the smoke detecting means 20 is disposed inside the convex portion 73, smoke is generated in the dark box 30 by forming an opening 73c between the ribs 73b. The structure is easy to guide.

天板73aは、その中心位置に円形の貫通穴である作動表示部73dが設けられている。この作動表示部73dには、背面側から光ガイド部材90の発光面97aを有する円形凸部97が嵌合され、煙感知手段20の作動状態を示す赤色光が発光面97aから正面側に向かって出射されるようになっている。
また、天板73aの背面側には、後述する光ガイド部材90の第二の導光部92の外形に対応してガイド保持部73eが形成されている。このガイド保持部73eは、上記第二の導光部92の側端面を取り囲む壁面をなしており、第二の導光部92をはめ込むことで光ガイド部材90の保持を可能とする。また、ガイド保持部73eの内面と天板73aの背面とは、白色樹脂であるため、その表面反射により、透明なる光ガイド部材90内を導かれる光を当該ガイド内から漏らさずに発光面97aまで伝える機能を補助している。なお、図4では、ガイド保持部73eと光ガイド部材90の第二の導光部92との間に隙間が描かれているが、隙間なく密接する方がより好ましい。また、ガイド保持部73eの内面と天板73aの背面には、より良く光を反射する物質や塗料を塗布しても良い。
The top plate 73a is provided with an operation display portion 73d which is a circular through hole at the center position thereof. A circular convex portion 97 having a light emitting surface 97a of the light guide member 90 is fitted to the operation display portion 73d from the back side, and red light indicating the operation state of the smoke sensing means 20 is directed from the light emitting surface 97a toward the front side. Are emitted.
A guide holding portion 73e is formed on the back side of the top plate 73a so as to correspond to the outer shape of the second light guide portion 92 of the light guide member 90 described later. The guide holding portion 73 e forms a wall surface surrounding the side end surface of the second light guide portion 92, and the light guide member 90 can be held by fitting the second light guide portion 92. Further, since the inner surface of the guide holding portion 73e and the back surface of the top plate 73a are white resin, the light-emitting surface 97a is not leaked from the inside of the guide due to the surface reflection without leaking the light guided inside the guide. Assists the function to tell up. In FIG. 4, a gap is drawn between the guide holding portion 73 e and the second light guide portion 92 of the light guide member 90, but it is more preferable that the guide holding portion 73 e is in close contact with the gap. Further, a substance or paint that better reflects light may be applied to the inner surface of the guide holding portion 73e and the back surface of the top plate 73a.

カバー体70の正面部71は、その中央部が、凸状部73の天板73aとほぼ同じ大きさで開口し、暗箱30が遊挿状態で配置されている。
さらに、正面部71の一端には、別部材で構成されると共に後方に押し込み可能に支持されたボタン入力部71aが設けられている。このボタン入力部71aは、その背面側に位置する回路基板40に実装された試験用押しボタン(図示略)に接しており、当該ボタン入力部71aを後方に押し込むことで、試験用押しボタンを入力操作することが可能となっている。なお、試験用押しボタンは警報ブザーの作動確認の試験を行うためのものであり、入力操作されると、煙感知にかかわらず、警報ブザーを鳴らすように回路基板40の回路が構成されている。
なお、符合71cは、ボタン入力部71aの背面側に連結された入力紐であり、この入力紐71cを引っ張ることでボタン入力部71aを介して試験用押しボタンを押下することも可能となっている。
The front portion 71 of the cover body 70 has a central portion that is opened with approximately the same size as the top plate 73a of the convex portion 73, and the dark box 30 is disposed in a loosely inserted state.
Further, at one end of the front portion 71, there is provided a button input portion 71a that is formed of a separate member and is supported so as to be pushed backward. The button input unit 71a is in contact with a test push button (not shown) mounted on the circuit board 40 located on the back side thereof, and the test input button 71a is pushed backward to thereby push the test push button. Input operation is possible. The test push button is for performing a test for confirming the operation of the alarm buzzer. When an input operation is performed, the circuit of the circuit board 40 is configured to sound the alarm buzzer regardless of smoke detection. .
Reference numeral 71c is an input string connected to the back side of the button input unit 71a. By pulling the input string 71c, the test push button can be pressed via the button input unit 71a. Yes.

また、正面部71における、凸状部73を挟んでボタン入力部71aと反対側の位置には、正面部71を表裏に貫通形成された複数本のスリットからなる警報出力部71bが設けられている。警報ブザーは、筐体50内において警報出力部71bの近傍に配置され、その作動時には、警報出力部71bを通じて筐体50の外部に警報音を発するようになっている。   In addition, an alarm output unit 71b composed of a plurality of slits penetrating the front part 71 on the front and back sides is provided at a position on the front part 71 opposite to the button input part 71a across the convex part 73. Yes. The alarm buzzer is disposed in the vicinity of the alarm output unit 71b in the housing 50, and emits an alarm sound to the outside of the housing 50 through the alarm output unit 71b when activated.

カバー体70の円筒部72における背面側は広く開放されており、当該円筒部72に挿入可能な外径に設定された仕切板75が挿入されて閉塞されるようになっている。つまり、図3及び図4に示すように、カバー体70と仕切板75とにより暗箱30と回路基板40の格納スペースが形成される。なお、この仕切板75もカバー体70と同様に、白色の樹脂材料にて一体成形で作られている。
格納時において、暗箱30は二つの爪30aにより回路基板40に連結され、暗箱30はカバー体70側に配置され、回路基板40は仕切板75側に配置される。
仕切板75には、回路基板40との対向面上に当該回路基板40を位置決めするための一対の突起76,76が形成されており、回路基板40に貫通して形成された位置決め穴42,42に挿入することで回路基板40を適正に位置決めすると共に回路基板40にガタつきがないように保持を行う。
つまり、暗箱30と一体的に連結された回路基板40を突起76,76により位置決めしながら、仕切板75をカバー体70の円筒部72の背面側端部から挿入すると、暗箱30及び回路基板40は、前後方向についてカバー体70と仕切板75とにより挟持されることで安定的に保持され、回路基板40の平面方向については突起76,76によって安定的に保持される。
なお、カバー体70と仕切板75とは図示しない止めネジにより固定連結されるようにになっている。
The back side of the cylindrical portion 72 of the cover body 70 is widely open, and a partition plate 75 set to an outer diameter that can be inserted into the cylindrical portion 72 is inserted and closed. That is, as shown in FIGS. 3 and 4, the cover body 70 and the partition plate 75 form a storage space for the dark box 30 and the circuit board 40. The partition plate 75 is also integrally formed of a white resin material, like the cover body 70.
During storage, the dark box 30 is connected to the circuit board 40 by two claws 30a, the dark box 30 is disposed on the cover body 70 side, and the circuit board 40 is disposed on the partition plate 75 side.
The partition plate 75 is formed with a pair of protrusions 76 and 76 for positioning the circuit board 40 on the surface facing the circuit board 40, and the positioning holes 42 formed through the circuit board 40. The circuit board 40 is properly positioned by being inserted into 42 and held so that the circuit board 40 is not rattled.
That is, when the partition plate 75 is inserted from the rear side end of the cylindrical portion 72 of the cover body 70 while positioning the circuit board 40 integrally connected to the dark box 30 by the protrusions 76 and 76, the dark box 30 and the circuit board 40 are inserted. Is stably held by being sandwiched between the cover body 70 and the partition plate 75 in the front-rear direction, and is stably held by the protrusions 76 in the planar direction of the circuit board 40.
The cover body 70 and the partition plate 75 are fixedly connected by a set screw (not shown).

ベース体60は、カバー体70の外径と等しい円板であり、仕切板75を介してカバー体70と同心となるように連結される。また、このベース体60もまた、白色の樹脂材料にて一体成形で作られている。
ベース体60の背面側には、図2に示すように、火災感知器10の設置壁面に対してネジ止めを行うための長穴状或いは鍵穴状のネジの挿通穴61が貫通して設けられている。また、ベース体60には、壁面に設けられたフックなどに火災感知器10を吊下するための壁掛けリング62が一体成形で設けられている。この壁掛けリング62は、火災感知器10を壁に吊下して設置する場合に切り離され、その基端部が取り付け穴65に取り付けられて使用される。
The base body 60 is a disc having the same diameter as the outer diameter of the cover body 70, and is connected to be concentric with the cover body 70 via a partition plate 75. The base body 60 is also formed by integral molding with a white resin material.
As shown in FIG. 2, a long hole-like or keyhole-like screw insertion hole 61 for screwing the wall surface of the fire detector 10 is provided on the back side of the base body 60. ing. The base body 60 is integrally provided with a wall hanging ring 62 for hanging the fire detector 10 on a hook or the like provided on the wall surface. The wall-hanging ring 62 is cut off when the fire detector 10 is installed suspended from a wall, and its base end is attached to the attachment hole 65 for use.

また、仕切板75の背面側における所定の直径の両端部となる位置には、互いに先端を内側に向けてL字状に形成された一対の連結用フックが形成されており、これに対応して、ベース体60の正面側における所定の直径の両端部となる位置には、互いに先端を外側に向けてL字状に形成された一対の連結用フックが形成されている。そして、ベース体60と仕切板75とは、各連結用フックの互いの先端部が相手の内側に挿入されるように、ベース体60を仕切板75に対して回転させることにより連結が行われるようになっている。
これらベース体60と仕切板75との間の区域は、図示しないバッテリーの格納スペースとして活用される。
In addition, a pair of connecting hooks formed in an L shape with their tips facing inward are formed at positions corresponding to both ends of a predetermined diameter on the back side of the partition plate 75, and correspondingly. Thus, a pair of connecting hooks that are formed in an L shape with their ends facing outward are formed at positions that are both ends of a predetermined diameter on the front side of the base body 60. Then, the base body 60 and the partition plate 75 are connected by rotating the base body 60 with respect to the partition plate 75 so that the respective distal end portions of the respective connecting hooks are inserted inside the counterpart. It is like that.
The area between the base body 60 and the partition plate 75 is used as a storage space for a battery (not shown).

(煙感知手段)
煙感知手段20は、暗箱30内に設けられる発光素子21(例えば発光ダイオード)と受光素子22(例えば、フォトダイオード)とから構成される。即ち、発光素子21はその照射範囲が制限された状態で暗箱30内に配置され、受光素子22は検査光が直接入射されないように受光範囲が制限された状態で暗箱30内に配置される(図8参照)。
さらに、暗箱30内において、発光素子21と受光素子22とは、その照射範囲とその受光範囲とが一部が重複するように配置され、その重複領域(検煙領域Aとする)に煙が侵入すると当該煙により発光素子21の照射光が散乱されて受光素子22に入射し、煙が感知されるようになっている。
(Smoke detection means)
The smoke sensing means 20 includes a light emitting element 21 (for example, a light emitting diode) and a light receiving element 22 (for example, a photodiode) provided in the dark box 30. That is, the light emitting element 21 is disposed in the dark box 30 with its irradiation range being limited, and the light receiving element 22 is disposed in the dark box 30 with the light receiving range being limited so that the inspection light is not directly incident ( (See FIG. 8).
Further, in the dark box 30, the light emitting element 21 and the light receiving element 22 are arranged so that the irradiation range and the light receiving range partially overlap, and smoke is generated in the overlapping area (referred to as smoke detection area A). When entering, the light emitted from the light emitting element 21 is scattered by the smoke and enters the light receiving element 22 so that the smoke is detected.

(回路基板)
回路基板40は、前述した煙感知手段20の発光素子21と受光素子22及び警報音を発する図示しない警報ブザーが接続されており、さらに基板上には、感知手段20の作動状態を示す光源としてのLED41と前述した試験用押しボタンとが実装されている。
そして、上記LED41は、回路基板40における暗箱30が取り付けられる面上であって当該暗箱30の下側に隠れる位置に実装される。
(Circuit board)
The circuit board 40 is connected to the light emitting element 21 and the light receiving element 22 of the smoke detecting means 20 and an alarm buzzer (not shown) that emits an alarm sound. Further, the circuit board 40 is used as a light source indicating the operating state of the detecting means 20. LED 41 and the test push button described above are mounted.
The LED 41 is mounted on a surface of the circuit board 40 on which the dark box 30 is attached and hidden behind the dark box 30.

そして、回路基板40は、その一番目の機能として、発光素子21を点灯させると共に当該点灯時に所定値以上の光強度で受光素子22が検出を行うと、警報ブザーを鳴らす処理を実行する回路が構成されている。
また、二番目の機能として、試験用押しボタンが押下されると、受光素子22の検出の有無にかかわらず、警報ブザーを鳴らす処理を実行する回路が構成されている。
さらに、回路基板40は、三番目の機能として、電源が正常に投入されて、煙感知手段20の発光素子21と受光素子22とが煙の感知を行うことが可能な状態(作動中)にある時に、LED41を点灯させる処理を実行する回路が構成されている。
As a first function, the circuit board 40 turns on the light emitting element 21 and, when the light receiving element 22 detects with a light intensity equal to or higher than a predetermined value at the time of lighting, a circuit that executes a process for sounding an alarm buzzer. It is configured.
As a second function, a circuit is configured to execute a process for sounding an alarm buzzer regardless of whether or not the light receiving element 22 is detected when the test push button is pressed.
Further, as a third function, the circuit board 40 is in a state (operating) in which the power is normally turned on and the light emitting element 21 and the light receiving element 22 of the smoke detecting means 20 can detect smoke. At some point, a circuit for executing a process of turning on the LED 41 is configured.

(光ガイド部材)
図5(A)は光ガイド部材90の正面図、図5(B)は平面図、図5(C)は底面図を示す。また、図6(A)は光ガイド部材90を正面方向から見た断面図、図6(B)は図6(A)の要部を拡大して示した説明図である。
図示のように、光ガイド部材90は、丸棒状に形成された第一の導光部91と、平板状に形成された第二の導光部92とを備え、これらが光の透過性の高い透明素材(例えば樹脂)により一体的に形成されている。
また、上記光ガイド部材90は、図4に示すように、平板状の第二の導光部92の一方の平板面に発光面97aを備えると共に筐体50内において当該発光面97aを正面側に向けて装備される。そして、第二の導光部92の発光面97aが設けられた平板面とは逆側の平板面に第一の導光部91が垂直に立設されている。
(Light guide member)
5A is a front view of the light guide member 90, FIG. 5B is a plan view, and FIG. 5C is a bottom view. 6A is a cross-sectional view of the light guide member 90 as viewed from the front direction, and FIG. 6B is an explanatory diagram showing an enlarged main part of FIG. 6A.
As shown in the figure, the light guide member 90 includes a first light guide portion 91 formed in a round bar shape and a second light guide portion 92 formed in a flat plate shape, which are light transmissive. It is integrally formed of a high transparent material (for example, resin).
Further, as shown in FIG. 4, the light guide member 90 includes a light emitting surface 97 a on one flat plate surface of the flat plate-like second light guide portion 92, and the light emitting surface 97 a in the housing 50 is located on the front side. Equipped towards. And the 1st light guide part 91 is standingly arranged by the flat surface on the opposite side to the flat plate surface in which the light emission surface 97a of the 2nd light guide part 92 was provided.

上記第一の導光部91は、その一方の端部の端面が前述した回路基板40の上に実装されたLED41に正対して配置され、他方の端部は第二の導光部92に一体的に接続されている。
そして、上記一方の端部の端面は、LED41からの照射光の入射面91aとして機能する。
The first light guide 91 is arranged such that one end face of the first light guide 91 faces the LED 41 mounted on the circuit board 40 described above, and the other end faces the second light guide 92. Connected together.
And the end surface of said one edge part functions as the incident surface 91a of the irradiation light from LED41.

第二の導光部92は、図5(B)に示すように、その平板形状が略台形と円形とを一体的に組み合わせた形状に形成されている。より詳細には、台形の下底(対をなす平行な二辺の長い方)側が当該下底よりも直径の大きな円形の外周に連接された形状をなしている。   As shown in FIG. 5B, the second light guide portion 92 has a flat plate shape that is formed by integrally combining a substantially trapezoidal shape and a circular shape. More specifically, the lower base of the trapezoid (the longer one of the two parallel sides forming a pair) is connected to a circular outer periphery having a diameter larger than that of the lower base.

前述した第一の導光部91は、上記第二の導光部92の台形部分93の上底の近傍となる位置において、平板面に垂直な方向に一体的に連結されており、なお且つ、第一の導光部91の連結端部に正対するように、第一の反射面94が形成されている。
第一の反射面94は、第一の導光部91の中心線に対して45°の傾斜角度で対向し、なお且つ、当該反射面94は、第一の導光部91の中心線に沿って進行する光を第二の導光部92の円形部分95側に反射する方向に向けて形成されている。
The first light guide 91 described above is integrally connected in a direction perpendicular to the flat plate surface at a position near the upper base of the trapezoidal portion 93 of the second light guide 92, and The first reflecting surface 94 is formed so as to face the connecting end portion of the first light guide portion 91.
The first reflecting surface 94 is opposed to the center line of the first light guide unit 91 at an inclination angle of 45 °, and the reflecting surface 94 is opposed to the center line of the first light guide unit 91. The light traveling along the second light guide portion 92 is formed so as to be reflected toward the circular portion 95 side.

なお、この第一の反射面94は、第二の導光部92の平板面に形成された凹部96の内面により形成されており、光ガイド部材90は、当該凹部96が形成される平板面を、前述した筐体50の天板73aの背面に対向させて配置されるので、天板73aの背面側には、凹部96の形状に応じて当該凹部96内にはめ込まれる突起が形成されている。
そして、かかる突起の表面には光反射性の高い皮膜を形成することが望ましい。
The first reflecting surface 94 is formed by an inner surface of a concave portion 96 formed on the flat plate surface of the second light guide portion 92, and the light guide member 90 is a flat plate surface on which the concave portion 96 is formed. Is disposed so as to face the back surface of the top plate 73a of the casing 50 described above, and a projection that fits into the recess 96 is formed on the back side of the top plate 73a according to the shape of the recess 96. Yes.
And it is desirable to form a film with high light reflectivity on the surface of the protrusion.

また、上記第二の導光部92の台形部分93は、図5(B)に示すように、その平面視形状が第一の導光部91から円形部分95に向かって幅が広がる形状となっているので、第一の導光部91から第一の反射面94により反射した光を効果的に円形部分95に向かわせることが可能となっている。   Further, the trapezoidal portion 93 of the second light guide portion 92 has a shape in which the width in plan view increases from the first light guide portion 91 toward the circular portion 95 as shown in FIG. Therefore, the light reflected by the first reflecting surface 94 from the first light guide portion 91 can be effectively directed toward the circular portion 95.

第二の導光部92の円形部95は、図5(B)に示すように、その正面側の平面に当該円形部95と同心となるように円形凸部97が形成され、その円形凸部97の端面が発光面97aとなっている。かかる円形凸部97は、前述したように、筐体50の天板73aの中心位置に設けられた円形貫通穴である作動表示部73dに挿入されるようになっている。
そして、図4に示すように、円形凸部97の挿入状態において、発光面97aは天板73aの正面(外側平面)よりもわずかに奥に位置するように円形凸部97の高さが設定されている。これにより、発光面97aを外部に接触させて傷などの発生を低減することができる。
なお、発光面97aは、天板73aの正面と同一平面か正面よりもわずかに突出するように円形凸部97の高さ設定を行っても良い。その場合、周囲からの発光状態の確認が容易となる。
また、円形部95の外径は円形凸部97よりも大きく設定されているが、これらの外径値は同一とならない範囲で互いに近い大きさとすることが望ましい。そうすることにより、円形部95まで伝達された光の減衰を抑えて発光面97aから発光させることが可能となる。
As shown in FIG. 5B, the circular portion 95 of the second light guide portion 92 has a circular convex portion 97 formed concentrically with the circular portion 95 on the front plane. The end surface of the portion 97 is a light emitting surface 97a. As described above, the circular convex portion 97 is inserted into the operation display portion 73d which is a circular through hole provided at the center position of the top plate 73a of the casing 50.
Then, as shown in FIG. 4, in the inserted state of the circular convex portion 97, the height of the circular convex portion 97 is set so that the light emitting surface 97a is positioned slightly behind the front surface (outer plane) of the top plate 73a. Has been. Accordingly, it is possible to reduce the occurrence of scratches by bringing the light emitting surface 97a into contact with the outside.
Note that the height of the circular convex portion 97 may be set so that the light emitting surface 97a is flush with the front surface of the top plate 73a or slightly protrudes from the front surface. In this case, it is easy to check the light emission state from the surroundings.
Moreover, although the outer diameter of the circular part 95 is set larger than the circular convex part 97, it is desirable that these outer diameter values are close to each other within a range where they are not the same. By doing so, it is possible to emit light from the light emitting surface 97a while suppressing attenuation of the light transmitted to the circular portion 95.

さらに、第二の導光部92の円形部95は、図5(C)及び図6に示すように、その背面側の平面に当該円形部95と同心となるように円形凹部98が形成され、その円形凹部98の内底面が傾斜面98aとなっている。
かかる傾斜面98aは、円形凹部98の深さ方向について第一の導光部91に近い方が浅く、第一の導光部91に遠い方が深くなるように傾斜して形成されており、その傾斜角度は例えば5°に設定されている。かかる傾斜により、第一の反射面94に反射されて進行する光が、より傾斜面98a全体に当たりやすい状態を形成することができる。
Further, as shown in FIGS. 5C and 6, the circular portion 95 of the second light guide portion 92 has a circular recess 98 formed concentrically with the circular portion 95 on the plane on the back side. The inner bottom surface of the circular recess 98 is an inclined surface 98a.
The inclined surface 98a is formed so as to be inclined so that the direction closer to the first light guide 91 in the depth direction of the circular recess 98 is shallower and the direction farther from the first light guide 91 is deeper. The inclination angle is set to 5 °, for example. With such an inclination, it is possible to form a state in which the light traveling after being reflected by the first reflecting surface 94 is more likely to hit the entire inclined surface 98a.

そして、傾斜面98aには、図5(C)及び図6(B)に示すように、その全面に渡って、直交する二方向のそれぞれについて平行且つ均一間隔で複数の断面V字状の溝99が形成されている(図6では逆さV字状に図示されている)。そして、各溝99は断面V字状であることから、一つの溝につき二つの平面が形成され、その内の特に第一の反射面94に近い方の面が発光面98a側に光反射を行う第二の反射面99aとして機能することとなる。
なお、各溝99のそれぞれにより形成される二平面は、図6(B)に示すように、その交角を90°とすることが望ましい。
As shown in FIGS. 5C and 6B, the inclined surface 98a has a plurality of V-shaped grooves in parallel with each other in two orthogonal directions over the entire surface. 99 is formed (shown in an inverted V shape in FIG. 6). Since each groove 99 has a V-shaped cross section, two planes are formed for each groove, and the surface closer to the first reflecting surface 94, among them, reflects light toward the light emitting surface 98a. It will function as the second reflecting surface 99a to be performed.
In addition, as shown in FIG. 6B, it is desirable that the two planes formed by each of the grooves 99 have an intersection angle of 90 °.

前述したように、傾斜面98aはその傾斜によりその全面が第一の反射面94に反射された光を受けやすくなっている。そして、傾斜面98aの全面に渡って複数の溝99により複数の第二の反射面99aが一定間隔で形成されているが、傾斜面98aの傾斜により、各第二の反射面99aは手前に位置する他の第二の反射面99aに遮られることなく、第一の反射面94からの光を受けて、発光面97a側に光反射を行うことができる。   As described above, the inclined surface 98a can easily receive the light reflected by the first reflecting surface 94 due to the inclination. A plurality of second reflecting surfaces 99a are formed at regular intervals by a plurality of grooves 99 over the entire surface of the inclined surface 98a, but each second reflecting surface 99a is brought forward by the inclination of the inclined surface 98a. The light from the first reflecting surface 94 can be received and reflected on the light emitting surface 97a side without being blocked by the other second reflecting surface 99a.

また、円形凹部98の内径は前述した円形凸部97の外径よりも大きく設定されている。これにより、傾斜面98aを発光面97aを含む平面上に投影したときに、傾斜面98aの投影面は、発光面97a全体を含むように重合し、且つ発光面97aよりも面積が大きくなる。従って、傾斜面98aの各第二の反射面99aからの反射光は、発光面97aよりも広範囲であってその周囲から反射されるので、発光面97aの正面からずれた位置から発光面97aを見ても、発光面97a全体が発光しているように見せることが可能である。   Further, the inner diameter of the circular concave portion 98 is set larger than the outer diameter of the circular convex portion 97 described above. Thereby, when the inclined surface 98a is projected onto the plane including the light emitting surface 97a, the projected surface of the inclined surface 98a is superposed so as to include the entire light emitting surface 97a, and the area is larger than that of the light emitting surface 97a. Accordingly, the reflected light from each second reflecting surface 99a of the inclined surface 98a is reflected in a wider range than the light emitting surface 97a and reflected from its surroundings. Even when viewed, it is possible to make the whole light emitting surface 97a appear to emit light.

(暗箱)
図7は暗箱30の斜視図、図8は暗箱30の内部構造を示す断面図、図9は後述する正面板31に設けられた構造を示す斜視図、図10は後述する背面板32に設けられた構造を示す斜視図である。
暗箱30は、筐体50内において正面側となる円形の正面板31と、背面側となる円形の背面板32と、正面板31と背面板32との間において当該正面板31又は背面板32のいずれかに一体成形された後述する各種の構造及び暗箱30の外周を覆う図示しない防虫網から構成されている。
なお、正面板31、背面板32とこれらに一体成形された各種の構造は、いずれも光吸収性の高い黒色樹脂から成形されている。
(Dark box)
7 is a perspective view of the dark box 30, FIG. 8 is a cross-sectional view showing the internal structure of the dark box 30, FIG. 9 is a perspective view showing a structure provided on a front plate 31 described later, and FIG. 10 is provided on a rear plate 32 described later. It is a perspective view which shows the structure made.
The dark box 30 includes a front plate 31 or a rear plate 32 between the front plate 31 and the rear plate 32, and a circular front plate 31 on the front side, a circular rear plate 32 on the rear side, and the front plate 31 and the rear plate 32. These are composed of various structures, which will be described later, integrally formed in any of the above and an insect repellent net (not shown) that covers the outer periphery of the dark box 30.
Note that the front plate 31 and the back plate 32 and the various structures integrally formed thereon are formed from a black resin having a high light absorption property.

正面板31と背面板32とは、いずれも等しい外径の円板であり、同心となるように互いに連結される。
また、正面板31と背面板32との間には、図8に示すように、煙感知手段20の発光素子21の前方を除いて周囲を覆いつつ保持を行う発光素子保持部33と、煙感知手段20の受光素子22の前方を除いて周囲を覆いつつ保持を行う受光素子保持部34と、暗箱30の外周近傍で外光の侵入を防止するラビリンス部35と、発光素子21の照射光が受光素子22の受光領域に直接入することを防ぐ遮蔽板36と、発光素子21からの出射光を受けて発光素子21と受光素子22とにより設定される検煙領域Aの外側に集光する反射板37とを備えている。
The front plate 31 and the back plate 32 are both discs having the same outer diameter, and are connected to each other so as to be concentric.
Further, between the front plate 31 and the back plate 32, as shown in FIG. 8, a light emitting element holding portion 33 for holding the smoke sensing means 20 while covering the periphery except for the front of the light emitting element 21, and a smoke The light receiving element holding part 34 that holds the surroundings except for the front of the light receiving element 22 of the sensing means 20, the labyrinth part 35 that prevents intrusion of external light near the outer periphery of the dark box 30, and the light emitted from the light emitting element 21 Is shielded from directly entering the light receiving area of the light receiving element 22, and the light emitted from the light emitting element 21 is received and condensed outside the smoke detection area A set by the light emitting element 21 and the light receiving element 22. The reflecting plate 37 is provided.

発光素子保持部33は、発光素子21を中心方向に向けて保持し、発光素子21の左右と後方を覆う壁面部33aと前方で照射範囲を規制する絞り部33bとを備えている。
上記壁面部33aは背面板32に一体成形され、絞り部33bは光軸を挟んで二分割され、一方が正面板31に、他方が背面板32に一体成形されている。
また、発光素子保持部33に保持された発光素子21は、そのリード線が背面板32を貫通して暗箱30の背面側に位置する回路基板40に接続されている。このリード線を暗箱30の外部に導く貫通穴の周囲には図示しない遮光壁が形成され、当該貫通穴からの外部光の侵入が防止されている。
The light emitting element holding portion 33 includes a wall surface portion 33a that holds the light emitting element 21 in the center direction and covers the left and right and the rear of the light emitting element 21, and a diaphragm portion 33b that restricts the irradiation range in the front.
The wall surface portion 33a is integrally formed with the back plate 32, the diaphragm portion 33b is divided into two parts with the optical axis in between, one is integrally formed with the front plate 31 and the other is integrally formed with the back plate 32.
The light emitting element 21 held by the light emitting element holding portion 33 is connected to the circuit board 40 whose lead wire passes through the back plate 32 and is located on the back side of the dark box 30. A light-shielding wall (not shown) is formed around the through hole that guides the lead wire to the outside of the dark box 30 to prevent intrusion of external light from the through hole.

受光素子保持部34は、受光素子22を中心方向に向けて保持し、受光素子22の左右と後方を覆う壁面部34aと前方で受光範囲を規制する絞り部34bとを備えている。
上記壁面部34aは背面板32に一体成形され、絞り部34bは正面板31に一体成形されている。
また、受光素子保持部34に保持された受光素子22は、そのリード線が背面板32を貫通して暗箱30の背面側に位置する回路基板40に接続されている。このリード線を暗箱30の外部に導く貫通穴の周囲にも図示しない遮光壁が形成され、外部光の侵入は防止されている。
The light receiving element holding part 34 includes a wall surface part 34 a that holds the light receiving element 22 toward the center and covers the left and right and the rear of the light receiving element 22, and a diaphragm part 34 b that restricts the light receiving range at the front.
The wall surface portion 34 a is integrally formed with the back plate 32, and the throttle portion 34 b is integrally formed with the front plate 31.
The light receiving element 22 held by the light receiving element holding part 34 is connected to a circuit board 40 whose lead wire passes through the back plate 32 and is located on the back side of the dark box 30. A light shielding wall (not shown) is also formed around the through hole that guides the lead wire to the outside of the dark box 30 to prevent intrusion of external light.

上記遮蔽板36は、発光素子保持部33と受光素子保持部34の間に配置され、発光素子21の照射範囲が受光素子22側から離れるように制限されている。かかる遮光板36は背面板32に一体成形されている。
そして、発光素子保持部33及び遮蔽板36に規定される照射領域と受光素子保持部34に規定される受光領域との重複する範囲が検煙領域Aとなり、煙がこの検煙領域A内に侵入すると、照射光が散乱されて生じる散乱光が受光素子22に受光されて、煙の侵入を感知する。
かかる検煙領域Aは、暗箱30のほぼ中央に設定される。
The shielding plate 36 is disposed between the light emitting element holding part 33 and the light receiving element holding part 34, and the irradiation range of the light emitting element 21 is limited to be separated from the light receiving element 22 side. The light shielding plate 36 is integrally formed with the back plate 32.
And the range which overlaps the irradiation area prescribed | regulated by the light emitting element holding | maintenance part 33 and the shielding board 36, and the light reception area prescribed | regulated by the light receiving element holding | maintenance part 34 turns into the smoke detection area A, and smoke in this smoke detection area A When entering, the scattered light generated by scattering the irradiation light is received by the light receiving element 22 to detect the intrusion of smoke.
Such smoke detection area A is set at the approximate center of the dark box 30.

反射板37は、発光素子21からの照射光を反射する凹面を備え、かかる反射板37は正面板31に一体成形されている。
反射板37は、発光素子21からの照射範囲全体の照射光を反射可能な大きさに設定され、暗箱30の外部となる仮想の集光点に集光するように凹面が形成されている。かかる仮想の集光点は、暗箱30の背面板32よりも背面側遠方に設定されており、反射板37をかかる形状とすることで、発光素子21からの照射光の反射光を全て受光領域外に向かわせることができ、検煙時の散乱光以外の外乱光の影響を抑制し、S/N比を向上することができる。
The reflection plate 37 includes a concave surface that reflects the irradiation light from the light emitting element 21, and the reflection plate 37 is integrally formed with the front plate 31.
The reflection plate 37 is set to a size capable of reflecting the irradiation light of the entire irradiation range from the light emitting element 21, and has a concave surface so as to collect light at a virtual condensing point outside the dark box 30. The virtual condensing point is set farther to the back side than the back plate 32 of the dark box 30, and the reflection plate 37 is shaped like this, so that all the reflected light of the irradiation light from the light emitting element 21 is received in the light receiving region. It can be directed to the outside, the influence of disturbance light other than scattered light at the time of smoke detection can be suppressed, and the S / N ratio can be improved.

ラビリンス部35は、断面形状が略L字状、略Z字状等の屈曲形状となる複数の壁面と、発光素子保持部33の壁面部33a、受光素子保持部34の壁面部34a、反射板37と一体的に形成された壁面とからなり、これらのラビリンス部35は、検煙領域Aを取り囲むように配置される。そして、図8に示す断面方向において、隙間を形成しながら互いにかみ合うように配置されることで、暗箱30の外周から検煙領域Aへの外部光の侵入を防止している。なお、各ラビリンス部35は互いに隙間をもって配置されるので、検煙領域Aへの煙の誘導は容易に行うことができる。
なお、各ラビリンス部35は、主に背面板32に一体成形されている。
The labyrinth portion 35 includes a plurality of wall surfaces having a bent shape such as a substantially L shape or a substantially Z shape in cross section, a wall surface portion 33a of the light emitting element holding portion 33, a wall surface portion 34a of the light receiving element holding portion 34, and a reflecting plate. 37 and the labyrinth part 35 are arranged so as to surround the smoke detection area A. And it arrange | positions so that it may mutually engage in the cross-sectional direction shown in FIG. 8, forming the clearance gap, and the penetration | invasion of the external light from the outer periphery of the dark box 30 to the smoke detection area | region A is prevented. In addition, since each labyrinth part 35 is arrange | positioned with a clearance gap between each other, the induction | guidance | derivation of the smoke to the smoke detection area | region A can be performed easily.
Each labyrinth portion 35 is mainly formed integrally with the back plate 32.

さらに、暗箱30には、当該暗箱30の正面側に配置される光ガイド部材90の第一の導光部91を挿通させる挿通部38が設けられている。この挿通部38は、正面板31を貫通して形成された挿通孔部38aと、背面板32に設けられた発光素子保持部33の壁面部33aに一体的に形成された管状部38bとから構成されている。この挿通孔部38aと管状部38bとは、正面板31と背面板32とを連結したときに、対応するように配置され、挿通孔部38aと管状部38bとの接続部には隙間が生じないように成形されている。かかる挿通部38により、暗箱30を正面から背面側に向かって貫通する孔部が形成されると共に、この挿通部38内に光ガイド部材90の第一の導光部91を挿通しても、LED41からの出射光や外部光、さらには当該第一の導光部91の透過光が暗箱30の内部に侵入することが防止される。
また、暗箱30よりも背面側に配置された回路基板40に実装されたLED41からの出射光を、筐体50の正面側で発光させる場合において、暗箱30を迂回する必要がない。
Further, the dark box 30 is provided with an insertion portion 38 through which the first light guide portion 91 of the light guide member 90 disposed on the front side of the dark box 30 is inserted. The insertion portion 38 includes an insertion hole portion 38 a formed through the front plate 31 and a tubular portion 38 b formed integrally with the wall surface portion 33 a of the light emitting element holding portion 33 provided on the back plate 32. It is configured. The insertion hole 38a and the tubular part 38b are arranged so as to correspond to each other when the front plate 31 and the rear plate 32 are connected to each other, and a gap is generated in the connection part between the insertion hole 38a and the tubular part 38b. It is molded so that there is no. The insertion portion 38 forms a hole that penetrates the dark box 30 from the front side toward the rear side, and even if the first light guide portion 91 of the light guide member 90 is inserted into the insertion portion 38, Light emitted from the LED 41, external light, and further transmitted light from the first light guide 91 are prevented from entering the dark box 30.
Further, when the emitted light from the LED 41 mounted on the circuit board 40 disposed on the back side of the dark box 30 is emitted on the front side of the housing 50, there is no need to bypass the dark box 30.

(火災感知器の動作説明)
上記構成からなる火災感知器10の動作説明を行う。火災感知器10は筐体50の背面を建造物の天井面に密接させて取り付けられるか、鉛直な壁面に密接させて取り付けられる。
回路基板40は電源であるバッテリーが接続されると、所定の初期化を行い、その後、煙感知手段20の発光素子21を点灯すると共に、煙感知手段20の正常な作動を示すLED41も点灯する。
LED41の照射光は、光ガイド部材90の入射面91aから第一の導光部91に侵入し、第一の反射面94に到達すると、第二の導光部92の台形部分93から円形部分95に向かう方向に反射される。
第二の導光部92内を進行する光は、傾斜面98の全体に到達し、当該傾斜面98上の各溝99により形成された無数の第二の反射面99aに反射され、発光面97aから高い光強度で発光が行われる。
(Explanation of fire detector operation)
The operation of the fire detector 10 having the above configuration will be described. The fire detector 10 is attached with the rear surface of the housing 50 in close contact with the ceiling surface of the building, or in close contact with a vertical wall surface.
When a battery as a power source is connected to the circuit board 40, the circuit board 40 performs predetermined initialization, and then the light emitting element 21 of the smoke detecting means 20 is turned on, and the LED 41 indicating the normal operation of the smoke detecting means 20 is also turned on. .
When the light emitted from the LED 41 enters the first light guide 91 from the incident surface 91a of the light guide member 90 and reaches the first reflecting surface 94, a circular portion is formed from the trapezoidal portion 93 of the second light guide 92. Reflected in the direction toward 95.
The light traveling in the second light guide portion 92 reaches the entire inclined surface 98, is reflected by the innumerable second reflecting surfaces 99a formed by the grooves 99 on the inclined surface 98, and emits light. Light is emitted from 97a with high light intensity.

また、火災による煙が発生すると、当該煙は、筐体50の開口部73cから暗箱30のラビリンス部35を介して検煙領域A内に侵入する。すると、発光素子21の照射光が散乱されて受光素子22で受光され、当該受光素子22の光感知から回路基板40は警報ブザーを鳴らす。これにより、火災感知が行われる。   Further, when smoke due to fire is generated, the smoke enters the smoke detection area A through the opening 73 c of the housing 50 through the labyrinth part 35 of the dark box 30. Then, the irradiation light of the light emitting element 21 is scattered and received by the light receiving element 22, and the circuit board 40 sounds an alarm buzzer from the light sensing of the light receiving element 22. Thereby, fire detection is performed.

(実施形態の効果)
火災感知器10は、光ガイド部材90が傾斜面98に形成された複数の溝99の反射により発光面97aからの発光を可能とするので、筐体50における外部への発光位置が回路基板40におけるLED41の配置に制限されず、筐体50の凸状部73の中央に位置する作動表示部73dから発光させることができる。つまり、筐体正面側における凸状部73の先端位置からの発光により、筐体50の全周から作動状態を確認することが可能となる。
(Effect of embodiment)
In the fire detector 10, the light guide member 90 can emit light from the light emitting surface 97 a by the reflection of the plurality of grooves 99 formed on the inclined surface 98, so that the light emitting position to the outside in the housing 50 is the circuit board 40. It is not restricted to arrangement | positioning of LED41 in this, It can be made to light-emit from the operation | movement display part 73d located in the center of the convex-shaped part 73 of the housing | casing 50. FIG. That is, the operating state can be confirmed from the entire circumference of the casing 50 by light emission from the tip position of the convex portion 73 on the front side of the casing.

さらに、光ガイド部材90において、第二の反射面99aを形成する各溝99が傾斜面98aに形成されているので、第二の導光部92をその平板面に沿って透過する光の進行方向に対して後方に位置する溝99も前方の溝99に遮られることなく光反射を行うことができる。このため、光ガイド部材90は、光の減衰や損失を抑え、透過光を効率的に発光面97aまで伝達するので、より高い光強度で発光することができ、より確実に、作動状態を確認することが可能となる。
また、第二の導光部92の円形凹部98が円形凸部97よりも径が大きく同心なので、発光面97a側に投影させた傾斜面98aが発光面97a全体に重合し且つ広面積なので、発光面97aの正面以外の方向から見ても発光面97a全体が発光しているように見せることができ、筐体50の正面側の作動表示部73dの周囲における全周からより良好に作動状態を確認することが可能となる。
Furthermore, in the light guide member 90, since each groove 99 forming the second reflecting surface 99a is formed in the inclined surface 98a, the light traveling through the second light guide portion 92 along its flat plate surface is progressed. The groove 99 positioned rearward with respect to the direction can also reflect light without being blocked by the front groove 99. For this reason, the light guide member 90 suppresses attenuation and loss of light and efficiently transmits the transmitted light to the light emitting surface 97a. Therefore, the light guide member 90 can emit light with higher light intensity, and confirm the operation state more reliably. It becomes possible to do.
Further, since the circular concave portion 98 of the second light guide portion 92 has a larger diameter and concentric than the circular convex portion 97, the inclined surface 98a projected on the light emitting surface 97a side overlaps with the entire light emitting surface 97a and has a large area. Even when viewed from a direction other than the front surface of the light emitting surface 97a, the entire light emitting surface 97a can be seen to emit light, and the operating state is better from the entire periphery around the operation display portion 73d on the front side of the housing 50. Can be confirmed.

さらに、火災感知器10では、暗箱30に光ガイド部材90の第一の導光部91を挿通する光を透過しない管状の挿通部38を設けたので、暗箱30を迂回して光ガイド部材90を配置するスペースを不要とすることができ、火災感知器10の小型化を図ることが可能となる。
さらに、光ガイド部材90の迂回自体を不要とするため、LED41から発光面97aまでの光の減衰を抑制し、より高い光強度で発光することができ、より確実に、作動状態を確認することが可能となる。
Furthermore, in the fire detector 10, since the tubular insertion portion 38 that does not transmit light that passes through the first light guide portion 91 of the light guide member 90 is provided in the dark box 30, the light guide member 90 bypasses the dark box 30. Therefore, it is possible to reduce the size of the fire detector 10.
Furthermore, since detouring of the light guide member 90 is not required, attenuation of light from the LED 41 to the light emitting surface 97a can be suppressed, light can be emitted with higher light intensity, and the operating state can be confirmed more reliably. Is possible.

また、光ガイド部材90は、暗箱30の正面側壁面と筐体50の天板73aの背面との間に挟んで固定するため、火災感知器10の組み立てにおいて、暗箱30を筐体50内に設置する際に、光ガイド部材90の配置が同時に行われて組み立て作業を容易とし、また、光ガイド部材90の固定手段や固定構造を排除又は簡略化することができ、火災感知器の生産性の向上を図ることが可能となる。   Further, since the light guide member 90 is sandwiched and fixed between the front side wall surface of the dark box 30 and the back surface of the top plate 73a of the casing 50, the dark box 30 is placed in the casing 50 when the fire detector 10 is assembled. When installing, the light guide member 90 is arranged at the same time to facilitate the assembly work, and the fixing means and the fixing structure of the light guide member 90 can be eliminated or simplified. Can be improved.

発明の実施形態たる火災感知器の正面側を示す斜視図である。It is a perspective view which shows the front side of the fire detector which is embodiment of invention. 火災感知器の背面側を示す斜視図である。It is a perspective view which shows the back side of a fire detector. 火災感知器の分解斜視図である。It is a disassembled perspective view of a fire detector. 図1に示すX−X線に沿った火災感知器の断面図である。It is sectional drawing of the fire detector along the XX line shown in FIG. 図5(A)は光ガイド部材の正面図、図5(B)は平面図、図5(C)は底面図を示す。5A is a front view of the light guide member, FIG. 5B is a plan view, and FIG. 5C is a bottom view. 図6(A)は光ガイド部材を正面方向から見た断面図、図6(B)は図6(A)の要部を拡大して示した説明図である。6A is a cross-sectional view of the light guide member seen from the front direction, and FIG. 6B is an explanatory view showing an enlarged main part of FIG. 6A. 暗箱の斜視図である。It is a perspective view of a dark box. 暗箱の内部構造を示す断面図である。It is sectional drawing which shows the internal structure of a dark box. 暗箱の正面板に設けられた構造を示す斜視図である。It is a perspective view which shows the structure provided in the front plate of the dark box. 暗箱の背面板に設けられた構造を示す斜視図である。It is a perspective view which shows the structure provided in the backplate of the dark box.

符号の説明Explanation of symbols

10 火災感知器
20 煙感知手段(火災感知手段)
30 暗箱
38 挿通部
38a 挿通孔部
38b 管状部
41 LED(光源)
50 筐体
73 突状部
73a 天板
90 光ガイド部材
91 第一の導光部
92 第二の導光部
94 第一の反射面
97a 発光面
98a 傾斜面
99 溝
99a 第二の反射面
10 Fire detector 20 Smoke detection means (fire detection means)
30 Dark box 38 Insertion part 38a Insertion hole part 38b Tubular part 41 LED (light source)
50 Housing 73 Projection 73a Top plate 90 Light guide member 91 First light guide 92 Second light guide 94 First reflection surface 97a Light emission surface 98a Inclined surface 99 Groove 99a Second reflection surface

Claims (4)

正面中央部が凸状に形成され、火災感知手段を内蔵する筐体と、
前記筐体内で点灯して前記火災感知手段の作動状態を示す光源と、
前記光源が発する光を、内部の光透過により前記筐体の正面中央部の凸状の先端位置の中央部まで伝達する光ガイド部材とを備え、
前記光ガイド部材は、平板状に形成された部分を備えると共に、当該平板の一方の平面に設けられた透過光射出用の発光面と、他方の平面に傾斜して設けられた前記発光面に対向する傾斜面とを有し、
前記傾斜面に、内部透過光を前記発光面側に反射するための反射面を形成する複数の溝を形成したことを特徴とする火災感知器。
A front center part is formed in a convex shape, and a housing containing a fire detection means,
A light source that lights up in the housing and indicates the operating state of the fire sensing means;
A light guide member that transmits the light emitted from the light source to the central portion of the convex tip position of the front central portion of the housing by transmitting light inside;
The light guide member includes a flat plate-shaped portion, a light emitting surface for transmitting light emission provided on one flat surface of the flat plate, and the light emitting surface provided inclined to the other flat surface. An opposing inclined surface,
A fire detector according to claim 1, wherein a plurality of grooves are formed on the inclined surface to form a reflection surface for reflecting internal transmitted light toward the light emitting surface.
前記発光面に対して垂直に前記傾斜面を投影した場合に、当該投影された傾斜面が前記発光面全域に重合すると共に前記発光面よりも面積が大きくなるように、前記光ガイド部材の傾斜面が形成されていることを特徴とする請求項1記載の火災感知器。   When the inclined surface is projected perpendicular to the light emitting surface, the light guide member is inclined so that the projected inclined surface overlaps the entire light emitting surface and has a larger area than the light emitting surface. The fire detector according to claim 1, wherein a surface is formed. 正面中央部が凸状に形成され、火災感知手段を内蔵する筐体と、
前記筐体内で点灯して前記火災感知手段の作動状態を示す光源と、
前記光源が発する光を、内部の光透過により前記筐体の正面中央部の凸状の先端位置の中央部まで伝達する光ガイド部材とを備え、
前記火災感知手段は、外部光を遮断する暗箱内に設けられ、当該暗箱内に侵入した煙による散乱光を検出して火災感知を行うと共に、
前記暗箱に、当該暗箱を貫通して形成された光を透過しない管状の前記光ガイド部材の挿通部を設けたことを特徴とする火災感知器。
A front center part is formed in a convex shape, and a housing containing a fire detection means,
A light source that lights up in the housing and indicates the operating state of the fire sensing means;
A light guide member that transmits the light emitted from the light source to the central portion of the convex tip position of the front central portion of the housing by transmitting light inside;
The fire detection means is provided in a dark box that blocks external light, and detects fire by detecting scattered light from smoke that has entered the dark box.
A fire detector, wherein the dark box is provided with a tubular light guide member insertion portion that does not transmit light formed through the dark box.
前記光ガイド部材は、前記暗箱の外壁と前記筐体の内壁との間に挟んで固定されることを特徴する請求項3記載の火災感知器。   The fire detector according to claim 3, wherein the light guide member is fixed by being sandwiched between an outer wall of the dark box and an inner wall of the housing.
JP2005191623A 2005-06-30 2005-06-30 Fire detector Active JP4668702B2 (en)

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JP5489447B2 (en) * 2008-11-27 2014-05-14 協立化学産業株式会社 Photocurable resin composition having light-shielding property and adhesiveness and cured product thereof
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