JP6437732B2 - smoke detector - Google Patents

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JP6437732B2
JP6437732B2 JP2014068414A JP2014068414A JP6437732B2 JP 6437732 B2 JP6437732 B2 JP 6437732B2 JP 2014068414 A JP2014068414 A JP 2014068414A JP 2014068414 A JP2014068414 A JP 2014068414A JP 6437732 B2 JP6437732 B2 JP 6437732B2
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smoke
light emitting
light
axis
unit
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JP2015191462A (en
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克裕 鈴木
克裕 鈴木
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Nohmi Bosai Ltd
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Description

本発明は、発光部を備える煙感知器に関する。   The present invention relates to a smoke detector including a light emitting unit.

煙感知器として、例えば、発光部と受光部とを備え、光の散乱を利用して煙を感知する光電式スポット型感知器が提案されている。特許文献１には、半値角が１０度以下の発光素子を備えた発光部が用いられ、この発光部の光軸と受光部の光軸とが交差する散乱角が６０°から８０°の範囲になっている散乱光式煙感知器が開示されている。この従来技術では、発光素子として、赤外光を照射するＬＥＤが使用されている。特許文献１は、発光素子の半値角を規制し、且つ発光部及び受光部の光軸同士のなす散乱角を規制することによって、発光素子から照射された光が、受光部によって直接受光されることを抑制しようとするものである。   As a smoke detector, for example, a photoelectric spot type detector that includes a light-emitting unit and a light-receiving unit and detects smoke using light scattering has been proposed. In Patent Document 1, a light emitting unit including a light emitting element having a half-value angle of 10 degrees or less is used, and a scattering angle in which the optical axis of the light emitting unit and the optical axis of the light receiving unit intersect is in a range of 60 ° to 80 °. A scattered light smoke detector is disclosed. In this prior art, an LED that emits infrared light is used as a light emitting element. In Patent Document 1, the light emitted from the light emitting element is directly received by the light receiving unit by regulating the half-value angle of the light emitting element and regulating the scattering angle between the optical axes of the light emitting unit and the light receiving unit. It is something that tries to suppress that.

特開平７―７２０７３号公報（請求項１、第２頁）JP-A-7-72073 (Claim 1, page 2)

しかしながら、特許文献１に開示された散乱光式煙感知器は、発光部及び受光部の設置位置が最適化されていないため、発光部から照射された光を受光する受光部において、この受光部が受光する光量が充分でない。   However, the scattered light type smoke detector disclosed in Patent Document 1 is not optimized in the installation positions of the light emitting unit and the light receiving unit, and therefore, in the light receiving unit that receives light emitted from the light emitting unit, the light receiving unit The amount of light received by is not sufficient.

本発明は、上記のような課題を背景としてなされたもので、受光部が受光する光量が増加する煙感知器を提供するものである。   The present invention has been made against the background of the above problems, and provides a smoke detector that increases the amount of light received by a light receiving unit.

本発明に係る煙感知器は、煙が流入する外形円筒状の煙流入部と、煙流入部の外周の縁部に設けられ、煙流入部の内部に光を照射する発光部と、煙流入部の外周の縁部に設けられ、発光部から照射されて煙流入部にて散乱した光を受光する受光部と、を有し、発光部は、第１の発光部と第２の発光部とから構成されており、第１の発光部における第１の発光軸と受光部における受光軸との第１の光軸交点は、煙流入部の周方向断面における中心を通って且つ第１の発光軸に対し垂直な中心線よりも、第１の発光部の側に位置され、第２の発光部における第２の発光軸と受光部における受光軸との第２の光軸交点は、煙流入部の周方向断面における中心を通って且つ第２の発光軸に対し垂直な中心線よりも、第２の発光部の側に位置されていることを特徴とする。 A smoke detector according to the present invention includes a cylindrical smoke inflow portion into which smoke flows , a light emitting portion that is provided at an outer peripheral edge of the smoke inflow portion, irradiates light inside the smoke inflow portion, and a smoke inflow And a light receiving unit that receives light emitted from the light emitting unit and scattered by the smoke inflow unit, and the light emitting unit includes a first light emitting unit and a second light emitting unit. It is composed of a first optical axis intersecting point between the light receiving axis of the light receiving portion and the first light-emitting axis of the first light emitting portion passes through the center in the circumferential direction section of the smoke inlet section and the first The second optical axis intersection of the second light emitting axis in the second light emitting unit and the light receiving axis in the light receiving unit is located on the side of the first light emitting unit with respect to the center line perpendicular to the light emitting axis. than the vertical center line to and a second light-emitting axis passing through the center in the circumferential direction section of the inflow part, it is located on the side of the second light-emitting portion And wherein the door.

本発明によれば、発光部における発光軸と受光部における受光軸との光軸交点が、発光軸に対し垂直且つ煙流入部の中心を通る中心線よりも、発光部の側に位置されているため、受光部が受光する光量を増加させることができる。   According to the present invention, the optical axis intersection of the light emitting axis in the light emitting unit and the light receiving axis in the light receiving unit is positioned on the light emitting unit side with respect to the center line perpendicular to the light emitting axis and passing through the center of the smoke inflow unit. Therefore, the amount of light received by the light receiving unit can be increased.

実施の形態１に係る煙感知器の光学台１を示す正面図である。It is a front view which shows the optical stand 1 of the smoke detector which concerns on Embodiment 1. FIG. 実施の形態１に係る煙感知器の光学台１を示す側面図である。It is a side view which shows the optical stand 1 of the smoke detector which concerns on Embodiment 1. FIG. 実施の形態１に係る煙感知器の光学台１を示す底面図である。It is a bottom view which shows the optical stand 1 of the smoke detector which concerns on Embodiment 1. FIG. 実施の形態１における煙検知部４を示す周方向断面図である。FIG. 3 is a circumferential cross-sectional view showing smoke detector 4 in the first embodiment. 実施の形態１における煙進入部３を示す周方向断面図である。FIG. 3 is a circumferential cross-sectional view showing the smoke entry portion 3 in the first embodiment. 実施の形態１に係る煙感知器の光学台１を示す軸方向断面図である。3 is an axial cross-sectional view showing the optical stand 1 of the smoke detector according to Embodiment 1. FIG. 実施の形態１に係る煙感知器の光学台１を示す軸方向断面図である。3 is an axial cross-sectional view showing the optical stand 1 of the smoke detector according to Embodiment 1. FIG. 実施の形態１における発光部５及び受光部６の位置を示す模式図である。3 is a schematic diagram illustrating positions of a light emitting unit 5 and a light receiving unit 6 according to Embodiment 1. FIG. 実施の形態１の変形例における発光部５及び受光部６の位置を示す模式図である。6 is a schematic diagram showing positions of light emitting unit 5 and light receiving unit 6 in a modification of the first embodiment. FIG. 実施の形態２における発光部２０５及び受光部６の位置を示す模式図である。6 is a schematic diagram showing positions of a light emitting unit 205 and a light receiving unit 6 according to Embodiment 2. FIG. 実施の形態２の変形例における発光部５及び受光部３０６の位置を示す模式図である。FIG. 10 is a schematic diagram showing positions of light emitting unit 5 and light receiving unit 306 in a modification of the second embodiment.

以下、本発明に係る煙感知器の実施の形態について、図面を参照しながら説明する。なお、以下に説明する実施の形態によって本発明が限定されるものではない。また、図１を含め、以下の図面では各構成部材の大きさの関係が実際のものとは異なる場合がある。   Hereinafter, embodiments of a smoke detector according to the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments described below. Moreover, in the following drawings including FIG. 1, the relationship of the size of each component may be different from the actual one.

実施の形態１．
図１は、実施の形態１に係る煙感知器の光学台１を示す正面図であり、図２は、実施の形態１に係る煙感知器の光学台１を示す側面図である。この図１、図２に基づいて、煙感知器の光学台１について説明する。図１、図２に示すように、光学台１は、煙の進入口となる煙進入部３と、この煙進入部３の上方に設けられ、煙進入部３から進入した煙を検知する煙検知部４とを備えた煙流入部２を有している。この煙流入部２は、例えば外形略円筒状をなしており、煙進入部３及び煙検知部４が、厚み方向（矢印Ｚ方向）に積層されている。このような光学台１は、煙感知器の本体（図示せず）内に設置されるものであって、詳細な説明は省略するが、煙感知器の本体には、光学台１の煙進入部３の位置に合わせて、煙の流入口が形成される。 Embodiment 1 FIG.
FIG. 1 is a front view showing the optical stand 1 of the smoke detector according to the first embodiment, and FIG. 2 is a side view showing the optical stand 1 of the smoke detector according to the first embodiment. The optical stand 1 of the smoke detector will be described with reference to FIGS. As shown in FIG. 1 and FIG. 2, the optical bench 1 is provided with a smoke intrusion portion 3 that serves as an entrance for smoke, and smoke that is provided above the smoke entrance portion 3 and detects smoke that has entered from the smoke entrance portion 3. The smoke inflow part 2 provided with the detection part 4 is provided. The smoke inflow portion 2 has, for example, a substantially cylindrical shape, and the smoke intrusion portion 3 and the smoke detection portion 4 are stacked in the thickness direction (arrow Z direction). Such an optical bench 1 is installed in a main body (not shown) of the smoke detector and will not be described in detail, but the smoke entrance of the optical bench 1 is inserted into the main body of the smoke detector. A smoke inlet is formed in accordance with the position of the portion 3.

図３は、実施の形態１に係る煙感知器の光学台１を示す底面図である。図３に示すように、煙流入部２における煙検知部４は、発光部５と受光部６とを備えている。これらの発光部５と受光部６とは、いずれも、例えば、煙流入部２における煙検知部４の外周の縁部に設けられている。そして、発光部５は、煙流入部２の内部に光を照射するものであり、その光は例えば青色光とすることができるが、そのほかの波長の光を使用してもよい。この例としては、紫外光、緑色光、赤色光又は赤外光等が挙げられる。この青色光は、例えば、４４０ｎｍ〜４８０ｎｍ程度の波長の光である。また、受光部６は、発光部５から照射されて煙流入部２にて散乱した光を受光するものである。なお、発光部５から照射される光が青色光である場合、受光部６は、少なくとも、青色光を受光する機能を備えていればよいが、それ以外の波長における光を受光する機能を備えていてもよい。   FIG. 3 is a bottom view showing the optical stand 1 of the smoke detector according to the first embodiment. As shown in FIG. 3, the smoke detection unit 4 in the smoke inflow unit 2 includes a light emitting unit 5 and a light receiving unit 6. Each of the light emitting unit 5 and the light receiving unit 6 is provided, for example, at an outer peripheral edge of the smoke detecting unit 4 in the smoke inflow unit 2. And the light emission part 5 irradiates light inside the smoke inflow part 2, The light can be made into blue light, for example, However, You may use the light of another wavelength. Examples of this include ultraviolet light, green light, red light, and infrared light. The blue light is light having a wavelength of about 440 nm to 480 nm, for example. The light receiving unit 6 receives light emitted from the light emitting unit 5 and scattered by the smoke inflow unit 2. In addition, when the light irradiated from the light emission part 5 is blue light, the light-receiving part 6 should just be provided with the function to receive blue light at least, but is provided with the function to receive the light in other than that wavelength. It may be.

図４は、実施の形態１における煙検知部４を示す周方向断面図であり、図１におけるＡ−Ａ断面図である。図４に示すように、煙流入部２における煙検知部４は、ラビリンス領域４１と煙検出領域４３とを備えている。ラビリンス領域４１は、煙検出領域４３内にノイズ光が発生しないように、光を散乱させてトラップする領域であり、中心側を向く先端が尖った柱状部材であるラビリンス４２が円周状に複数設置されることによって構成されている。そして、発光部５から照射された光は、これらの複数のラビリンス４２の壁面によって、散乱され減衰する。また、煙検出領域４３は、ラビリンス領域４１の内側に設けられ、煙が検出される領域である。   FIG. 4 is a circumferential cross-sectional view showing the smoke detector 4 in the first embodiment, and is a cross-sectional view taken along the line AA in FIG. As shown in FIG. 4, the smoke detection unit 4 in the smoke inflow unit 2 includes a labyrinth region 41 and a smoke detection region 43. The labyrinth region 41 is a region where light is scattered and trapped so that noise light does not occur in the smoke detection region 43, and a plurality of labyrinths 42, which are columnar members with sharp tips pointing toward the center, are arranged circumferentially. It is configured by being installed. And the light irradiated from the light emission part 5 is scattered and attenuate | damped by the wall surface of these several labyrinths 42. FIG. The smoke detection area 43 is an area provided inside the labyrinth area 41 where smoke is detected.

煙検知部４に煙がない場合、発光部５から照射された光は、ラビリンス領域４１に設けられた複数のラビリンス４２によって散乱され、光強度が減衰されていくため、受光部６によって受光されない。これに対し、煙検知部４に煙が進入した場合、発光部５から照射された光は、煙検出領域４３における煙によって散乱され、受光部６によって受光される。このように、煙感知器の光学台１は、受光部６によって光を受光することによって、煙を感知するものである。   When there is no smoke in the smoke detector 4, the light emitted from the light emitter 5 is scattered by a plurality of labyrinths 42 provided in the labyrinth region 41, and the light intensity is attenuated, so that it is not received by the light receiver 6. . On the other hand, when smoke enters the smoke detection unit 4, the light emitted from the light emitting unit 5 is scattered by the smoke in the smoke detection region 43 and received by the light receiving unit 6. As described above, the optical platform 1 of the smoke detector detects smoke by receiving light by the light receiving unit 6.

図５は、実施の形態１における煙進入部３を示す周方向断面図であり、図１におけるＢ−Ｂ断面図である。図５に示すように、煙流入部２における煙進入部３には、屈曲した板状部材である遮光部３１が円周状に複数設置されている。これらの遮光部３１は、光学台１の外部から外光が入射しようとする際に、この外光を遮断して、煙進入部３の内部に、外光が入り込むことを抑制するものである。一方、これらの遮光部３１同士の間は、開口部３２となっており、これらの開口部３２から、煙進入部３の内部に、煙が進入する。   FIG. 5 is a circumferential cross-sectional view showing the smoke intrusion portion 3 in the first embodiment, and is a cross-sectional view taken along the line BB in FIG. As shown in FIG. 5, a plurality of light shielding portions 31 that are bent plate-like members are circumferentially installed in the smoke intrusion portion 3 in the smoke inflow portion 2. These light shielding portions 31 block external light from entering the inside of the smoke intrusion portion 3 when external light is about to enter from the outside of the optical bench 1 and prevent the external light from entering the inside of the smoke entrance portion 3. . On the other hand, between these light shielding parts 31, there are openings 32, and smoke enters the inside of the smoke entry part 3 from these openings 32.

図６は、実施の形態１に係る煙感知器の光学台１を示す軸方向断面図であり、図１におけるＣ−Ｃ断面図である。また、図７は、実施の形態１に係る煙感知器の光学台１を示す軸方向断面図であり、図２におけるＤ−Ｄ断面図である。図６、図７に示すように、煙進入部３と煙検知部４とは、これらの煙進入部３における中央部と煙検知部４における中央部とが、互いに開口されて繋がっており、煙が通過する煙流路２１となっている。煙進入部３の内部に進入した煙は、この煙流路２１を通って、煙検知部４の内部に進入する。   6 is an axial sectional view showing the optical stand 1 of the smoke detector according to the first embodiment, and is a sectional view taken along the line CC in FIG. FIG. 7 is an axial sectional view showing the optical stand 1 of the smoke detector according to the first embodiment, and is a DD sectional view in FIG. As shown in FIG. 6 and FIG. 7, the smoke intrusion unit 3 and the smoke detection unit 4 are connected to each other with the central part of the smoke intrusion unit 3 and the central part of the smoke detection unit 4 being opened to each other. A smoke passage 21 through which smoke passes is provided. The smoke that has entered the inside of the smoke intrusion unit 3 enters the inside of the smoke detection unit 4 through the smoke passage 21.

次に、煙流入部２の煙検知部４における発光部５及び受光部６の設置位置について、詳細に説明する。図８は、実施の形態１における発光部５及び受光部６の位置を示す模式図である。図８に示すように、発光部５における光軸を発光軸Ａｅ、受光部６における光軸を受光軸Ａｒ、これらの発光軸Ａｅと受光軸Ａｒとの交点を光軸交点Ｉとする。また、煙流入部２の中心の点を中心点Ｏとする。なお、煙流入部２の中心点Ｏは、煙検出領域４３の中心点Ｏと共通する。そして、発光軸Ａｅに対し垂直且つ中心点Ｏを通る線分を中心線Ｌｏとする。   Next, the installation positions of the light emitting unit 5 and the light receiving unit 6 in the smoke detection unit 4 of the smoke inflow unit 2 will be described in detail. FIG. 8 is a schematic diagram showing the positions of the light emitting unit 5 and the light receiving unit 6 in the first embodiment. As shown in FIG. 8, the optical axis in the light emitting unit 5 is the light emitting axis Ae, the optical axis in the light receiving unit 6 is the light receiving axis Ar, and the intersection of the light emitting axis Ae and the light receiving axis Ar is the optical axis intersection I. The center point of the smoke inflow portion 2 is defined as a center point O. The center point O of the smoke inflow portion 2 is in common with the center point O of the smoke detection region 43. A line segment perpendicular to the light emitting axis Ae and passing through the center point O is defined as a center line Lo.

本実施の形態１では、発光部５における発光軸Ａｅと受光部６における受光軸Ａｒとの光軸交点Ｉは、発光軸Ａｅに対し垂直且つ煙流入部２の中心点Ｏを通る中心線Ｌｏよりも、発光部５の側に位置されている。なお、光軸交点Ｉは、発光部５又は受光部６の向き又は位置によって、適宜変更することができる。   In the first embodiment, the optical axis intersection I between the light emitting axis Ae in the light emitting unit 5 and the light receiving axis Ar in the light receiving unit 6 is perpendicular to the light emitting axis Ae and passes through the center point Lo of the smoke inflow unit 2. Rather than the light emitting unit 5 side. The optical axis intersection point I can be appropriately changed depending on the direction or position of the light emitting unit 5 or the light receiving unit 6.

また、図８に示すように、煙流入部２の中心点Ｏを通る水平（矢印Ｘ方向）な線を水平線Ｌｈとする。本実施の形態１では、発光部５は、発光軸Ａｅが煙流入部２の中心点Ｏから逸れている。即ち、発光軸Ａｅは、中心点Ｏを通らない。また、発光軸Ａｅが受光部６の側に傾いており、発光軸Ａｅと水平線Ｌｈとのなす角度はθｅである。なお、発光軸Ａｅと水平線Ｌｈとは平行且つ重なっていてもよい。即ち、発光軸Ａｅは、中心点Ｏを通ってもよい。この場合、発光部５から照射された光において、煙検出領域４３の径方向の長さを最大限に活用することができる。即ち、発光部５から照射された光の光路長が長くなり、その結果、煙を感知する機能が向上する。   Further, as shown in FIG. 8, a horizontal line (in the direction of the arrow X) passing through the center point O of the smoke inflow portion 2 is defined as a horizontal line Lh. In the first embodiment, the light emitting unit 5 has the light emitting axis Ae deviated from the center point O of the smoke inflow unit 2. That is, the light emission axis Ae does not pass through the center point O. Further, the light emitting axis Ae is inclined toward the light receiving unit 6, and the angle formed by the light emitting axis Ae and the horizontal line Lh is θe. The light emitting axis Ae and the horizontal line Lh may be parallel and overlap. That is, the light emission axis Ae may pass through the center point O. In this case, the length of the smoke detection region 43 in the radial direction can be utilized to the maximum in the light emitted from the light emitting unit 5. That is, the optical path length of the light emitted from the light emitting unit 5 is increased, and as a result, the function of sensing smoke is improved.

更に、図８に示すように、発光軸Ａｅと受光軸Ａｒとのなす角度は、鋭角θｓであり、例えば３０°である。また、発光部５は、発光スペクトルにおける半値角が１５°以下である。なお、発光部５の発光スペクトルにおける半値角は、１５°より広角にしてもよい。   Further, as shown in FIG. 8, the angle formed by the light emitting axis Ae and the light receiving axis Ar is an acute angle θs, for example, 30 °. Moreover, the light emission part 5 has a half-value angle in an emission spectrum of 15 ° or less. Note that the half-value angle in the emission spectrum of the light emitting unit 5 may be wider than 15 °.

次に、本実施の形態１に係る煙感知器の光学台１の作用について説明する。本実施の形態１は、青色光を照射する発光部５が使用されている。粒径が小さい粒子は、波長が短い光ほど、検出し易い。本実施の形態１は、青色光を照射する発光部５が使用されているため、粒径が小さい粒子を含む煙を検出することができる。   Next, the operation of the optical stand 1 of the smoke detector according to the first embodiment will be described. In the first embodiment, a light emitting unit 5 that emits blue light is used. Particles with a smaller particle size are easier to detect as the wavelength is shorter. In the first embodiment, since the light emitting unit 5 that emits blue light is used, smoke including particles having a small particle size can be detected.

また、前述の如く、発光部５における発光軸Ａｅと受光部６における受光軸Ａｒとの光軸交点Ｉは、発光軸Ａｅに対し垂直且つ煙流入部２の中心、即ち中心点Ｏを通る中心線Ｌｏよりも、発光部５の側に位置されている。青色光は、青色光よりも波長が長い赤外光等よりも、光強度（明るさ）が低く、受光感度も低い。このため、青色光は、受光部６によって検出され難い。   Further, as described above, the optical axis intersection point I between the light emitting axis Ae in the light emitting unit 5 and the light receiving axis Ar in the light receiving unit 6 is perpendicular to the light emitting axis Ae and passes through the center of the smoke inflow unit 2, that is, the center passing through the center point O. It is located closer to the light emitting unit 5 than the line Lo. Blue light has lower light intensity (brightness) and lower light receiving sensitivity than infrared light having a longer wavelength than blue light. For this reason, blue light is difficult to be detected by the light receiving unit 6.

しかしながら、本実施の形態１は、光軸交点Ｉが、発光部５に近いため、煙流入部２の内部に煙が進入した場合、発光部５から照射された青色光は、光軸交点Ｉの近傍で煙粒子に当たり、散乱され、直ちに受光部６によって受光される。このため、受光部６は、発光部５から照射される青色光が散乱されて、光強度が減衰する前に、この青色光を受光することができる。従って、発光部５から照射される青色光を受光する受光部６において、受光部６が受光する光量を増加させることができる。   However, in the first embodiment, since the optical axis intersection I is close to the light emitting unit 5, when smoke enters the smoke inflow unit 2, the blue light emitted from the light emitting unit 5 is the optical axis intersection I. , Hits the smoke particles and is scattered and immediately received by the light receiving unit 6. Therefore, the light receiving unit 6 can receive the blue light before the blue light emitted from the light emitting unit 5 is scattered and the light intensity is attenuated. Accordingly, in the light receiving unit 6 that receives the blue light emitted from the light emitting unit 5, the amount of light received by the light receiving unit 6 can be increased.

更に、発光部５は、発光軸Ａｅが煙流入部２の中心、即ち中心点Ｏから逸れており、また、受光部６の側に傾いており、発光軸Ａｅと水平線Ｌｈとのなす角度はθｅである。このため、発光部５から照射された後に煙粒子に当たり、散乱された青色光は、より迅速に受光部６によって受光される。このため、発光部５から照射される青色光を受光する受光部６において、受光部６が受光する光量を更に増加させることができる。   Further, the light emitting unit 5 has the light emitting axis Ae deviated from the center of the smoke inflow portion 2, that is, the center point O, and is inclined toward the light receiving unit 6, and the angle formed between the light emitting axis Ae and the horizontal line Lh is θe. For this reason, the blue light which hits the smoke particles after being irradiated from the light emitting unit 5 and is scattered is received by the light receiving unit 6 more quickly. For this reason, in the light-receiving part 6 which receives the blue light irradiated from the light emission part 5, the light quantity which the light-receiving part 6 light-receives can further be increased.

従来の煙感知器の光学台は、発光部５の光軸と受光部６の光軸とのいずれもが、煙流入部２の中心点Ｏを通るように、発光部５及び受光部６が配置されており、これにより、煙流入部２の全域において散乱された光を均一に受光して、煙の流入方向に依存する感度のばらつきを低減しようとしている。しかしながら、発光部５の光軸と受光部６の光軸とのいずれもが、煙流入部２の中心点Ｏを通っていても、実際には、煙流入部２における発光部５から煙粒子までの距離、又はラビリンス４２の構造等によって、感度のばらつきが生じてしまう。   In the conventional smoke detector optical bench, the light emitting unit 5 and the light receiving unit 6 are arranged so that both the optical axis of the light emitting unit 5 and the optical axis of the light receiving unit 6 pass through the center point O of the smoke inflow unit 2. In this way, the light scattered in the entire area of the smoke inflow portion 2 is uniformly received, and the sensitivity variation depending on the smoke inflow direction is reduced. However, even if both the optical axis of the light emitting part 5 and the optical axis of the light receiving part 6 pass through the center point O of the smoke inflow part 2, actually, the smoke particles from the light emitting part 5 in the smoke inflow part 2 Variation in sensitivity may occur depending on the distance up to or the structure of the labyrinth 42 or the like.

更にまた、発光軸Ａｅと受光軸Ａｒとのなす角度は、鋭角θｓである。このように、発光部５と受光部６とが、より近い位置に配置されており、従って、発光部５から照射された後に煙粒子に当たり、散乱された青色光は、より迅速に受光部６によって受光される。また、発光軸Ａｅと受光軸Ａｒとのなす角度が、鋭角θｓであることにより、受光部６は、発光部５から照射されて煙粒子に当たった後の後方散乱光を、受光することができる。   Furthermore, the angle formed between the light emitting axis Ae and the light receiving axis Ar is an acute angle θs. In this way, the light emitting unit 5 and the light receiving unit 6 are disposed at closer positions. Therefore, the scattered blue light that hits the smoke particles after being irradiated from the light emitting unit 5 and is scattered more quickly. Is received by. In addition, since the angle formed between the light emitting axis Ae and the light receiving axis Ar is an acute angle θs, the light receiving unit 6 can receive the backscattered light after being irradiated from the light emitting unit 5 and hitting the smoke particles. it can.

そして、発光部５は、発光スペクトルにおける半値角が１５°以下である。このように、発光部５は、半値角が絞られた特性を備えているため、正面に向かって発光する光量を増加させることができる。これにより、光強度（明るさ）が比較的低い青色光においても、受光部６が受光する光量を増加させることができる。   And as for the light emission part 5, the half value angle in an emission spectrum is 15 degrees or less. Thus, since the light emission part 5 is provided with the characteristic by which the half value angle was narrowed down, it can increase the light quantity which light-emits toward the front. Thereby, the light quantity which the light-receiving part 6 light-receives can be increased also in blue light with comparatively low light intensity (brightness).

以上説明したように、本実施の形態１は、受光部６が受光する青色光の光量を増加させることができるため、粒径が小さい粒子を含む煙を効率的に検出することができる。このため、煙感知器の光学台１は、煙を感知する精度が極めて高い。なお、発光部５における発光軸Ａｅと受光部６における受光軸Ａｒとの光軸交点Ｉは、受光軸Ａｒに対し垂直且つ煙流入部２の中心点Ｏを通る中心線Ｌｏよりも、受光部６の側に位置されていてもよい。   As described above, since the first embodiment can increase the amount of blue light received by the light receiving unit 6, it can efficiently detect smoke containing particles having a small particle size. For this reason, the optical stand 1 of the smoke detector has extremely high accuracy for detecting smoke. It should be noted that the optical axis intersection I between the light emitting axis Ae in the light emitting unit 5 and the light receiving axis Ar in the light receiving unit 6 is perpendicular to the light receiving axis Ar and is more than the center line Lo passing through the center point O of the smoke inflow unit 2. It may be located on the 6 side.

（実施の形態１の変形例）
次に、本実施の形態１の変形例に係る煙感知器の光学台１００について説明する。図９は、実施の形態１の変形例における発光部５及び受光部６の位置を示す模式図である。この変形例では、図９に示すように、発光軸Ａｅと受光軸Ａｒとのなす角度は、鈍角θｏであり、例えば１２０°である。このように、変形例では、発光部５と受光部６とが、対向する位置に配置されている。そして、発光軸Ａｅと受光軸Ａｒとのなす角度が、鈍角θｏであることにより、受光部６は、発光部５から照射されて煙粒子に当たった後の前方散乱光を、受光することができる。 (Modification of Embodiment 1)
Next, an optical stand 100 of a smoke detector according to a modification of the first embodiment will be described. FIG. 9 is a schematic diagram showing the positions of the light emitting unit 5 and the light receiving unit 6 in the modification of the first embodiment. In this modification, as shown in FIG. 9, the angle formed by the light emitting axis Ae and the light receiving axis Ar is an obtuse angle θo, for example, 120 °. As described above, in the modification, the light emitting unit 5 and the light receiving unit 6 are arranged at opposing positions. Since the angle formed by the light emitting axis Ae and the light receiving axis Ar is an obtuse angle θo, the light receiving unit 6 can receive the forward scattered light after being irradiated from the light emitting unit 5 and hitting the smoke particles. it can.

実施の形態２．
次に、本実施の形態２に係る煙感知器の光学台２００について説明する。図１０は、実施の形態２における発光部２０５及び受光部６の位置を示す模式図である。本実施の形態２は、発光部２０５が、第１の発光部２０５ａと第２の発光部２０５ｂとから構成されている点で、実施の形態１と相違する。本実施の形態２では、実施の形態１と共通する部分は同一の符号を付して説明を省略し、実施の形態１との相違点を中心に説明する。 Embodiment 2. FIG.
Next, the optical stand 200 of the smoke detector according to the second embodiment will be described. FIG. 10 is a schematic diagram showing the positions of the light emitting unit 205 and the light receiving unit 6 in the second embodiment. The second embodiment is different from the first embodiment in that the light emitting unit 205 includes a first light emitting unit 205a and a second light emitting unit 205b. In the second embodiment, portions common to the first embodiment are denoted by the same reference numerals, description thereof is omitted, and differences from the first embodiment will be mainly described.

本実施の形態２は、図１０に示すように、第１の発光部２０５ａにおける第１の発光軸Ａｅ１と受光軸Ａｒとの第１の光軸交点Ｉ１は、第１の発光軸Ａｅ１に対し垂直且つ中心点Ｏを通る第１の中心線Ｌｏ１よりも、第１の発光部２０５ａの側に位置されている。また、第２の発光部２０５ｂにおける第２の発光軸Ａｅ２と受光軸Ａｒとの第２の光軸交点Ｉ２は、第２の発光軸Ａｅ２に対し垂直且つ中心点Ｏを通る第２の中心線Ｌｏ２よりも、第２の発光部２０５ｂの側に位置されている。 In the second embodiment, as shown in FIG. 10, the first optical axis intersection I 1 between the first light emitting axis Ae 1 and the light receiving axis Ar in the first light emitting unit 205a is the first light emitting axis Ae. than the first center line Lo 1 through the vertical and the center point O to 1, and is located on the side of the first light emitting portion 205a. Further, the second optical axis intersection I 2 between the second light emitting axis Ae 2 and the light receiving axis Ar in the second light emitting unit 205b is a second perpendicular to the second light emitting axis Ae 2 and passing through the center point O. the center line Lo 2, are located on the side of the second light-emitting portion 205b.

そして、第１の発光部２０５ａの第１の発光軸Ａｅ１と受光軸Ａｒとのなす角度は、鈍角θｏである。また、第２の発光部２０５ｂの第２の発光軸Ａｅ２と受光軸Ａｒとのなす角度は、鋭角θｓである。そして、第１の発光軸Ａｅ１と受光軸Ａｒとのなす角度が、鈍角θｏであることにより、受光部６は、第１の発光部２０５ａから照射されて煙粒子に当たった後の前方散乱光を受光することができる。また、第２の発光軸Ａｅ２と受光軸Ａｒとのなす角度が、鋭角θｓであることにより、受光部６は、第２の発光部２０５ｂから照射されて煙粒子に当たった後の後方散乱光を受光することができる。 The angle formed between the first light emitting axis Ae 1 of the first light emitting unit 205a and the light receiving axis Ar is an obtuse angle θo. The angle formed between the second light emitting axis Ae2 of the second light emitting unit 205b and the light receiving axis Ar is an acute angle θs. Then, since the angle formed by the first light emitting axis Ae 1 and the light receiving axis Ar is an obtuse angle θo, the light receiving unit 6 is forward scattered after being irradiated from the first light emitting unit 205a and hitting the smoke particles. Light can be received. In addition, since the angle formed between the second light emitting axis Ae2 and the light receiving axis Ar is an acute angle θs, the light receiving unit 6 is backscattered after being irradiated from the second light emitting unit 205b and hitting the smoke particles. Light can be received.

このように、本実施の形態２は、第１の発光軸Ａｅ１と受光軸Ａｒとのなす角度は、鈍角θｏであり、第２の発光軸Ａｅ２と受光軸Ａｒとのなす角度は、鋭角θｓであるため、光が煙粒子に当たった後の前方散乱光及び後方散乱光のいずれをも、受光部６によって受光することができる。これにより、実施の形態１で得られる効果に加えて、煙の検出能力を向上させることができるという効果を奏する。 Thus, in the second embodiment, the angle formed between the first light emitting axis Ae 1 and the light receiving axis Ar is an obtuse angle θo, and the angle formed between the second light emitting axis Ae 2 and the light receiving axis Ar is Because of the acute angle θs, both the forward scattered light and the back scattered light after the light hits the smoke particles can be received by the light receiving unit 6. Thereby, in addition to the effect acquired in Embodiment 1, there exists an effect that the detection capability of smoke can be improved.

（実施の形態２の変形例）
次に、本実施の形態２の変形例に係る煙感知器の光学台３００について説明する。図１１は、実施の形態２の変形例における発光部５及び受光部３０６の位置を示す模式図である。この変形例では、発光部５は１個であり、受光部３０６は、第１の受光部３０６ａと第２の受光部３０６ｂとから構成されている。 (Modification of Embodiment 2)
Next, an optical stage 300 of a smoke detector according to a modification of the second embodiment will be described. FIG. 11 is a schematic diagram illustrating the positions of the light emitting unit 5 and the light receiving unit 306 in a modification of the second embodiment. In this modification, there is one light emitting unit 5, and the light receiving unit 306 includes a first light receiving unit 306a and a second light receiving unit 306b.

図１１に示すように、発光軸Ａｅと第１の受光部３０６ａにおける第１の受光軸Ａｒ１との第１の光軸交点Ｉ１は、発光軸Ａｅに対し垂直且つ煙流入部２の中心点Ｏを通る中心線Ｌｏよりも、発光部５の側に位置されている。また、発光軸Ａｅと第２の受光部３０６ｂにおける第２の受光軸Ａｒ２との第２の光軸交点Ｉ２は、発光軸Ａｅに対し垂直且つ煙流入部２の中心点Ｏを通る中心線Ｌｏよりも、発光部５の側に位置されている。 As shown in FIG. 11, the first optical axis intersection I 1 between the light emitting axis Ae and the first light receiving axis Ar 1 in the first light receiving section 306a is perpendicular to the light emitting axis Ae and the center of the smoke inflow section 2 It is located closer to the light emitting unit 5 than the center line Lo passing through the point O. Further, the second optical axis intersection I 2 between the light emitting axis Ae and the second light receiving axis Ar 2 in the second light receiving portion 306b is a center perpendicular to the light emitting axis Ae and passing through the center point O of the smoke inflow portion 2. It is located closer to the light emitting unit 5 than the line Lo.

そして、発光軸Ａｅと第１の受光部３０６ａにおける第１の受光軸Ａｒ１とのなす角度は、鈍角θｏである。また、発光軸Ａｅと第２の受光部３０６ｂにおける第２の受光軸Ａｒ２とのなす角度は、鋭角θｓである。そして、発光軸Ａｅと第１の受光軸Ａｒ１とのなす角度が、鈍角θｏであることにより、第１の受光部３０６ａは、発光部５から照射されて煙粒子に当たった後の前方散乱光を受光することができる。また、発光軸Ａｅと第２の受光軸Ａｒ２とのなす角度が、鋭角θｓであることにより、第２の受光部３０６ｂは、発光部５から照射されて煙粒子に当たった後の後方散乱光を受光することができる。 The light-emitting axis Ae and the angle between the first and the light-receiving axis Ar 1 in the first light receiving portion 306a is obtuse .theta.o. Further, the angle between the second light receiving axis Ar 2 in the light-emitting axis Ae and the second light receiving portion 306b is an acute angle [theta] s. The light-emitting axis Ae and the angle between the first and the light-receiving axis Ar 1 is, by an obtuse angle .theta.o, first light receiving portion 306a is forward scattered after striking the smoke particles are irradiated from the light emitting unit 5 Light can be received. Furthermore, light-emitting axis Ae and the angle between the second light receiving axis Ar 2 is, by an acute angle [theta] s, the second light receiving portion 306b is backscatter after hitting the smoke particles are irradiated from the light emitting unit 5 Light can be received.

このように、変形例では、発光軸Ａｅと第１の受光軸Ａｒ１とのなす角度は、鈍角θｏであり、発光軸Ａｅと第２の受光軸Ａｒ２とのなす角度は、鋭角θｓであるため、光が煙粒子に当たった後の前方散乱光及び後方散乱光のいずれをも、第１の受光部３０６ａ及び第２の受光部３０６ｂによって受光することができる。これにより、実施の形態２と同様に、実施の形態１で得られる効果に加えて、煙の検出能力を向上させることができるという効果を奏する。 Thus, in the modified example, the angle formed between the light emitting axis Ae and the first light receiving axis Ar 1 is an obtuse angle θo, and the angle formed between the light emitting axis Ae and the second light receiving axis Ar 2 is an acute angle θs. Therefore, both the forward scattered light and the back scattered light after the light hits the smoke particles can be received by the first light receiving unit 306a and the second light receiving unit 306b. Thereby, in addition to the effect obtained in the first embodiment, as in the second embodiment, there is an effect that the smoke detection capability can be improved.

なお、上記実施の形態においては、煙流入部２が、煙進入部３と煙検知部４との２段構造からなる煙感知器を例示したが、煙流入部２は１段構造からなるように構成してもよい。また、発光部５と受光部６とは、夫々２個設けられていてもよく、更に３個以上設けられていてもよい。   In the above embodiment, the smoke inflow part 2 is exemplified by the smoke detector having the two-stage structure of the smoke intrusion part 3 and the smoke detection part 4, but the smoke inflow part 2 has a one-stage structure. You may comprise. Further, two light emitting units 5 and six light receiving units 6 may be provided, respectively, or three or more may be provided.

１ 光学台、２ 煙流入部、３ 煙進入部、４ 煙検知部、５ 発光部、６ 受光部、２１ 煙流路、３１ 遮光部、３２ 開口部、４１ ラビリンス領域、４２ ラビリンス、４３ 煙検出領域、１００ 光学台、２００ 光学台、２０５ 発光部、２０５ａ 第１の発光部、２０５ｂ 第２の発光部、３００ 光学台、３０６ 受光部、３０６ａ 第１の受光部、３０６ｂ 第２の受光部。   DESCRIPTION OF SYMBOLS 1 Optical stand, 2 Smoke | flow inflow part, 3 Smoke inflow part, 4 Smoke detection part, 5 Light emission part, 6 Light reception part, 21 Smoke flow path, 31 Light shielding part, 32 Opening part, 41 Labyrinth area | region, 42 Labyrinth, 43 Smoke detection Area, 100 optical table, 200 optical table, 205 light emitting unit, 205a first light emitting unit, 205b second light emitting unit, 300 optical table, 306 light receiving unit, 306a first light receiving unit, 306b second light receiving unit.

Claims (5)

煙が流入する外形円筒状の煙流入部と、
前記煙流入部の外周の縁部に設けられ、前記煙流入部の内部に光を照射する発光部と、
前記煙流入部の外周の縁部に設けられ、前記発光部から照射されて前記煙流入部にて散乱した光を受光する受光部と、を有し、
前記発光部は、第１の発光部と第２の発光部とから構成されており、
前記第１の発光部における第１の発光軸と前記受光部における受光軸との第１の光軸交点は、
前記煙流入部の周方向断面における中心を通って且つ前記第１の発光軸に対し垂直な中心線よりも、前記第１の発光部の側に位置され、
前記第２の発光部における第２の発光軸と前記受光部における受光軸との第２の光軸交点は、
前記煙流入部の周方向断面における中心を通って且つ前記第２の発光軸に対し垂直な中心線よりも、前記第２の発光部の側に位置されている
ことを特徴とする煙感知器。 A cylindrical smoke inflow section into which smoke flows,
A light emitting part provided at an outer peripheral edge of the smoke inflow part, and irradiating light inside the smoke inflow part;
A light receiving portion that is provided at an edge of the outer periphery of the smoke inflow portion and receives light emitted from the light emitting portion and scattered by the smoke inflow portion;
The light emitting unit is composed of a first light emitting unit and a second light emitting unit ,
The first optical axis intersection of the first light emitting axis in the first light emitting unit and the light receiving axis in the light receiving unit is:
It is located closer to the first light emitting unit than the center line passing through the center in the circumferential cross section of the smoke inflow unit and perpendicular to the first light emitting axis ,
The second optical axis intersection of the second light emitting axis in the second light emitting unit and the light receiving axis in the light receiving unit is:
The smoke detector is located on a side of the second light emitting unit with respect to a center line perpendicular to the second light emitting axis through a center in a circumferential cross section of the smoke inflow unit . . 煙が流入する外形円筒状の煙流入部と、
前記煙流入部の外周の縁部に設けられ、前記煙流入部の内部に光を照射する発光部と、
前記煙流入部の外周の縁部に設けられ、前記発光部から照射されて前記煙流入部にて散乱した光を受光する受光部と、を有し、
前記受光部は、複数設けられており、
前記発光部における発光軸と前記受光部における複数の受光軸との光軸交点は、
前記煙流入部の周方向断面における中心を通って且つ前記発光軸に対し垂直な中心線よりも、前記発光部の側に位置されている
ことを特徴とする煙感知器。 A cylindrical smoke inflow section into which smoke flows,
A light emitting part provided at an outer peripheral edge of the smoke inflow part, and irradiating light inside the smoke inflow part;
A light receiving portion that is provided at an edge of the outer periphery of the smoke inflow portion and receives light emitted from the light emitting portion and scattered by the smoke inflow portion;
A plurality of the light receiving parts are provided,
The optical axis intersection of the light emitting axis in the light emitting unit and the plurality of light receiving axes in the light receiving unit is:
The smoke detector, wherein the smoke detector is located on a side of the light emitting unit from a center line perpendicular to the light emitting axis through a center in a circumferential section of the smoke inflow unit. 前記発光部は、
発光軸が前記煙流入部の中心から逸れており、前記受光部の側に傾いている
ことを特徴とする請求項１又は２記載の煙感知器。 The light emitting unit
Emitting optical axis has deviated from the center of the smoke inlet section, smoke sensor according to claim 1 or 2, characterized in that inclined to the side of the light receiving portion. 前記煙流入部は、
光を散乱させるラビリンス領域と、
前記ラビリンス領域の内側に設けられ、前記煙が検出される煙検出領域と、を備え、
前記煙流入部の中心点は、
前記煙検出領域の中心点である
ことを特徴とする請求項１〜３のいずれか１項に記載の煙感知器。 The smoke inlet is
A labyrinth region that scatters light,
A smoke detection area provided inside the labyrinth area, where the smoke is detected,
The center point of the smoke inlet is
The smoke detector according to any one of claims 1 to 3, wherein the smoke detector is a center point of the smoke detection region. 煙が流入する外形円筒状の煙流入部と、
前記煙流入部の外周の縁部に設けられ、前記煙流入部の内部に光を照射する１個の発光部と、
前記煙流入部の外周の縁部に設けられ、前記発光部から照射されて前記煙流入部にて散乱した光を受光する１個の受光部と、を有し、
前記発光部における発光軸と前記受光部における受光軸との光軸交点は、
前記煙流入部の周方向断面における中心を通って且つ前記発光軸に対し垂直な中心線よりも、前記発光部の側に位置されており、
前記発光軸と前記受光軸とのなす角度は、鋭角である
ことを特徴とする煙感知器。 A cylindrical smoke inflow section into which smoke flows,
One light emitting part provided at an edge of the outer periphery of the smoke inflow part and irradiating light inside the smoke inflow part;
A light receiving portion provided at an outer peripheral edge of the smoke inflow portion and receiving light emitted from the light emitting portion and scattered by the smoke inflow portion;
The optical axis intersection of the light emitting axis in the light emitting part and the light receiving axis in the light receiving part is
It passes through the center in the circumferential cross section of the smoke inflow part and is located on the light emitting part side from the center line perpendicular to the light emitting axis,
The smoke detector, wherein an angle formed between the light emitting axis and the light receiving axis is an acute angle.
JP2014068414A 2014-03-28 2014-03-28 smoke detector Active JP6437732B2 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113519017A (en) * 2019-03-19 2021-10-19 能美防灾株式会社 Smoke detector
CN113519017B (en) * 2019-03-19 2022-12-02 能美防灾株式会社 Smoke detector

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