JPH0441436Y2 - - Google Patents
Info
- Publication number
- JPH0441436Y2 JPH0441436Y2 JP1986075195U JP7519586U JPH0441436Y2 JP H0441436 Y2 JPH0441436 Y2 JP H0441436Y2 JP 1986075195 U JP1986075195 U JP 1986075195U JP 7519586 U JP7519586 U JP 7519586U JP H0441436 Y2 JPH0441436 Y2 JP H0441436Y2
- Authority
- JP
- Japan
- Prior art keywords
- smoke
- guide wall
- wall
- light
- detection chamber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000000779 smoke Substances 0.000 claims description 98
- 238000001514 detection method Methods 0.000 claims description 36
- 230000002093 peripheral effect Effects 0.000 claims description 9
- 230000002238 attenuated effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 6
- 230000004043 responsiveness Effects 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
- Fire-Detection Mechanisms (AREA)
- Switches Operated By Changes In Physical Conditions (AREA)
- Electronic Switches (AREA)
Description
【考案の詳細な説明】
（産業上の利用分野）
本考案は、外部からの煙の流入を妨げることな
く外乱光の入射を遮断してノイズ光の受光素子へ
の入射を最小限に抑えるようにした光電式煙感知
器のラビリンス構造に関する。[Detailed description of the invention] (Field of industrial application) This invention is designed to minimize the incidence of noise light on the light receiving element by blocking the incidence of disturbance light without obstructing the inflow of smoke from the outside. Regarding the labyrinth structure of a photoelectric smoke detector.
（従来技術）
従来、光電式煙感知器、例えば煙による散乱光
の変化を受光素子で検出する光電式煙感知器にあ
つては、発光素子と受光素子を備えた検煙室を画
定する円筒状の周壁に一定間隔で複数の煙流入口
を開口し、この煙流入口の各々には、外部からの
光の入射を防ぐため、外部から見て煙流入口が完
全に遮られるように煙流入路を残してラビリンス
板を配置し、煙の流入を妨げることなく外乱光が
検煙室へ入射しないようにしている。(Prior Art) Conventionally, in the case of a photoelectric smoke detector, for example, a photoelectric smoke detector that uses a light receiving element to detect changes in light scattered by smoke, a cylinder defining a smoke detection chamber equipped with a light emitting element and a light receiving element is used. A plurality of smoke inlets are opened at regular intervals in the peripheral wall of the shape, and in order to prevent light from entering from the outside, each smoke inlet is opened so that the smoke inlet is completely blocked when viewed from the outside. A labyrinth plate is placed leaving an inflow path to prevent ambient light from entering the smoke detection chamber without interfering with the inflow of smoke.
第２図は、従来の光電式煙感知器の一例を示し
た説明図であり、感知器筐体１の下側に複数の煙
流入口２を備えた外部カバー３が装着され、外部
カバーの内側にラビリンス構造を備えたラビリン
ス部材４が組込まれ、ラビリンス部材４の内側に
検煙室を形成し、検煙室の上部には点線で示すよ
うに発光素子５と受光素子６が設けられ、この感
知器は散乱光方式を例にとることから、発光素子
５と受光素子６は相対しないように光軸を斜め下
方に向けて配置されている。 FIG. 2 is an explanatory diagram showing an example of a conventional photoelectric smoke detector, in which an external cover 3 equipped with a plurality of smoke inlets 2 is attached to the lower side of the sensor housing 1. A labyrinth member 4 having a labyrinth structure is incorporated inside, a smoke detection chamber is formed inside the labyrinth member 4, and a light emitting element 5 and a light receiving element 6 are provided in the upper part of the smoke detection chamber as shown by dotted lines. Since this sensor uses a scattered light method as an example, the light emitting element 5 and the light receiving element 6 are arranged with their optical axes facing diagonally downward so as not to face each other.
第３図は第２図の−断面をもつて本願出願
人がすでに提案しているラビリンス構造を示す
（実願昭58−101212号（実開昭60−8864号公報参
照））。 FIG. 3 shows a labyrinth structure already proposed by the applicant of the present invention, which has a cross section shown in FIG.
このラビリンス構造を実現するラビリンス部材
４は、検煙室を画定する円筒状の周壁に一定間隔
で煙流入口８を開口し、煙流入口８の側縁の一方
より内側斜め方向に向けて遮光板を兼ねた案内壁
９を煙流入口８の側縁の他方を越える位置まで延
在し、更に、案内壁９の内側略中央に検煙室の略
中心を指向する方向に補助壁１２を枝状に延在し
ている。 The labyrinth member 4 that realizes this labyrinth structure has smoke inlets 8 opened at regular intervals on a cylindrical peripheral wall that defines a smoke detection chamber, and has smoke inlets 8 that are shaded diagonally inward from one side edge of the smoke inlet 8. A guide wall 9 that also serves as a plate is extended to a position beyond the other side edge of the smoke inlet 8, and an auxiliary wall 12 is further provided approximately in the center of the inside of the guide wall 9 in a direction toward approximately the center of the smoke detection chamber. It extends into branches.
このようなラビリンス構造にあつては、案内壁
９に加えて補助壁１２を枝状に設けたことで、補
助壁１２によつて外部からの光の入射を防ぐ所謂
光トラツプが形成され、定常監視状態における受
光素子６へのノイズ光を最小限に押え、ノイズ光
の低減により検出感度を高めることができる。 In such a labyrinth structure, by providing branch-like auxiliary walls 12 in addition to the guide wall 9, the auxiliary walls 12 form a so-called light trap that prevents light from entering from outside. Noise light to the light receiving element 6 in the monitoring state can be suppressed to a minimum, and detection sensitivity can be increased by reducing the noise light.
また煙の流入を見ると、案内壁９の内側に補助
壁１２を延在しているため、煙流入口８から流れ
込んだ煙は、補助壁１２に当つて検煙室の中心部
に速やかに向かうようになり、案内壁９を設けて
いても検煙領域１１に対する煙の流入遅れを防い
で応答性の高い煙検出ができる。 Also, looking at the inflow of smoke, since the auxiliary wall 12 extends inside the guide wall 9, the smoke that flows in from the smoke inlet 8 hits the auxiliary wall 12 and quickly reaches the center of the smoke detection chamber. Even if the guide wall 9 is provided, a delay in the inflow of smoke to the smoke detection area 11 can be prevented, and smoke detection with high responsiveness can be performed.
（考案が解決しようとする問題点）
しかしながら、このような案内壁の内側略中央
に補助壁を枝状に延在したラビリンス構造にあつ
ても、案内壁９に沿つた方向から入射する外乱光
については、補助壁１２の手前の案内壁９の内面
で反射して検煙室に入射する場合があり、ノイズ
レベルを高める原因となつている。特に受光素子
６に略相対した位置にある特定の煙流入口８に矢
印Ａに示すように案内壁９に沿つて外部からの光
の入射があつたとき、補助壁１２の手前となる案
内壁８の内面で反射した光が直接受光素子６に入
射してしまう場合があり、このため感知器の設置
状態における周囲360度及び上下180度のあらゆる
方向からの外乱光の全てを完全に遮光することが
できず、特定位置からの外乱光を受けるとノイズ
出力をピーク的に生じ、誤報を出してしまう恐れ
があつた。(Problem to be solved by the invention) However, even with such a labyrinth structure in which the auxiliary wall extends in a branch shape approximately at the center inside the guide wall, disturbance light incident from the direction along the guide wall 9 may be reflected on the inner surface of the guide wall 9 in front of the auxiliary wall 12 and enter the smoke detection chamber, causing an increase in the noise level. In particular, when light from the outside is incident on a specific smoke inlet 8 located approximately opposite to the light receiving element 6 along the guide wall 9 as shown by arrow A, the guide wall is located in front of the auxiliary wall 12. Light reflected from the inner surface of sensor 8 may directly enter light-receiving element 6, so it is necessary to completely block out all disturbance light from all directions including 360 degrees around the sensor and 180 degrees above and below when the sensor is installed. Therefore, when disturbance light from a specific position is received, noise output peaks and there is a risk of false alarms being issued.
（問題点を解決するための手段）
本考案は、このような従来の問題点に鑑みてな
されたもので、感知器設置状態で上下及び左右の
あらゆる方向から外乱光を受けても検煙室への光
の入射を確実遮断できるようにした光電式煙感知
器のラビリンス構造を提供することを目的とす
る。(Means for solving the problem) The present invention was made in view of the above-mentioned conventional problems. An object of the present invention is to provide a labyrinth structure for a photoelectric smoke detector that can reliably block the incidence of light.
この目的を達成するため本考案にあつては、煙
流入口から内側に案内壁を延在すると共に案内壁
の内側に補助壁を枝状に設けるラビリンス構造を
基本とし、案内壁の形状と、案内壁に設ける補助
壁の位置及び角度を工夫することにより外乱光の
入射を確実に防ぐようにしたものである。即ち、
従来、案内壁の内側略中央に補助壁を技状に設け
ていたものを、本考案にあつては、少なくとも受
光素子に略相対する位置の周壁に対する案内壁の
付け根部分から検煙室略中央に向けて補助壁を延
在させるようにし、補助壁が案内壁先端に対し所
定の流入間隔を介して略直交した状態で位置する
こととなるため、案内壁に沿つた方向から外乱光
の入射を受けても、補助壁によつて完全に遮断で
きるようにしたものである。 In order to achieve this purpose, the present invention is based on a labyrinth structure in which a guide wall extends inward from the smoke inflow port and auxiliary walls are provided inside the guide wall in the form of branches, and the shape of the guide wall, By carefully adjusting the position and angle of the auxiliary wall provided on the guide wall, the incidence of disturbance light can be reliably prevented. That is,
Conventionally, an auxiliary wall was technically provided at approximately the center of the inside of the guide wall, but in the present invention, an auxiliary wall is installed approximately at the center of the smoke detection chamber from the base of the guide wall relative to the peripheral wall at least at a position approximately opposite to the light receiving element. The auxiliary wall is extended toward the guide wall, and the auxiliary wall is positioned approximately perpendicular to the tip of the guide wall with a predetermined inflow interval, so that disturbance light is not incident from the direction along the guide wall. Even if it is exposed to water, it can be completely blocked by the auxiliary wall.
また、従来、案内板を矩形状に形成していたも
のを、本考案にあつては、案内壁の先端を斜めに
形成することにより、案内壁の先端における煙の
流入特性を高めて応答性を向上するとともに、案
内壁の付け根部分における遮光性を向上すること
ができるようにしたものである。 In addition, whereas conventional guide plates were formed in a rectangular shape, in the present invention, the tip of the guide wall is formed obliquely, thereby improving the smoke inflow characteristics at the tip of the guide wall and improving responsiveness. In addition, it is possible to improve the light shielding property at the base of the guide wall.
（実施例）
第１図は本考案の一実施例を第３図の従来例と
同様、第２図における光電式煙感知器の−断
面方向から見て示した説明図である。(Embodiment) FIG. 1 is an explanatory diagram showing an embodiment of the present invention as viewed from the - cross-sectional direction of the photoelectric smoke detector in FIG. 2, similar to the conventional example shown in FIG. 3.
まず構成を説明すると、３は一定間隔毎に煙流
入口が開口された外部カバーであり、外部カバー
３で覆われた内部に本考案のラビリンス構造を備
えたラビリンス部材４を組込んでおり、ラビリン
ス部材４で円筒状に仕切られた検煙室の上部位置
には発光素子５と受光素子６が配置され、この発
光素子５と受光素子６の配置関係は第２図の従来
例に点線で示したように、散乱光方式をとること
から、その光軸が一致しないようにそれぞれ下向
きに所定の角度をもつて設けられており、両者の
光軸が交わる検煙室中央の空間に検煙部１４を形
成している。 First, to explain the structure, reference numeral 3 is an external cover in which smoke inlets are opened at regular intervals, and a labyrinth member 4 having the labyrinth structure of the present invention is incorporated inside the external cover 3. A light-emitting element 5 and a light-receiving element 6 are arranged in the upper part of the smoke detection chamber partitioned into a cylindrical shape by a labyrinth member 4. As shown in the figure, since the scattered light method is used, each is installed downward at a predetermined angle so that their optical axes do not coincide. A portion 14 is formed.
ラビリンス部材４は検煙室を画定する円筒状の
周壁に一定間隔で複数の煙流入口８を開口し、こ
の煙流入口８のそれぞれには流入口の側縁の一方
より内側内縁方向に向けて案内壁９が延在され、
この案内壁９の先端は同じ流入口の側縁の他方を
越える内側の位置まで延在されており、案内壁９
と煙流入口８を形成した外周壁７との間に外部か
らの煙を流入する煙流入路１０を形成している。 The labyrinth member 4 has a plurality of smoke inlets 8 opened at regular intervals in a cylindrical peripheral wall that defines a smoke detection chamber, and each of the smoke inlets 8 has a smoke inlet 8 which is oriented toward the inner edge from one of the side edges of the inlet. The guide wall 9 is extended,
The tip of this guide wall 9 extends to an inner position beyond the other side edge of the same inlet, and the guide wall 9
A smoke inflow path 10 through which smoke from the outside flows in is formed between the smoke inflow port 8 and the outer circumferential wall 7 in which the smoke inflow port 8 is formed.
更に、煙流入口８を開口した外周壁７より斜め
内側に延在された案内壁９の付け根部分内側に
は、検煙室の中心１６方向に向けて補助壁１５が
枝状に延在されており、補助壁１５は案内壁９の
先端を越える内側まで延在され、案内壁９の先端
との間に外部からの煙を導入する隙間を形成して
いる。 Furthermore, an auxiliary wall 15 extends in a branch shape toward the center 16 of the smoke detection chamber inside the base portion of the guide wall 9 that extends diagonally inward from the outer peripheral wall 7 that opens the smoke inlet 8. The auxiliary wall 15 extends to the inside beyond the tip of the guide wall 9, and forms a gap between the tip and the tip of the guide wall 9 through which smoke from the outside is introduced.
ここで案内壁９の内側付け根部分から延在され
た補助壁１５の指向方向は、延長線１８に示すよ
うに検煙部１４の中心１６を通る中心線１９に対
し所定のずれ量ｄをもつており、煙流入口８から
流入した煙を補助壁１５に当てて検煙部１４に向
わせ、検煙部１４には周囲に形成された複数の補
助壁１５に当たつた煙が気流の流れに乗り、中心
１６に向つて拡散しながら流入する。中心１６を
介して相対する補助壁１５からの煙が気流に乗つ
て拡散しながら中心１６に流れ込むことで、検煙
部１４に対する煙の流入効率と中心部での滞留度
合を高めるようにしている。 Here, the orientation direction of the auxiliary wall 15 extending from the inner root portion of the guide wall 9 has a predetermined deviation d from the center line 19 passing through the center 16 of the smoke detection section 14, as shown by the extension line 18. The smoke flowing in from the smoke inlet 8 hits the auxiliary wall 15 and is directed toward the smoke detection section 14, and the smoke that hits the plurality of auxiliary walls 15 formed around the smoke detection section 14 is directed to the smoke detection section 14, where the smoke that hits the plurality of auxiliary walls 15 formed around the smoke detection section 14 is directed to the smoke detection section 14. It rides the flow and flows toward the center 16 while diffusing. The smoke from the auxiliary walls 15 facing each other via the center 16 flows into the center 16 while being diffused by the airflow, thereby increasing the efficiency of smoke inflow into the smoke detection section 14 and the degree of retention in the center. .
更に、煙流入口８の側縁の一方から内側斜め方
向に延在された案内壁９の側面先端形状は、第１
ａ図に取り出して示すように、案内壁９の先端を
斜めに形成したテーパー端部２０としており、こ
のテーパー端部２０の形成で補助壁１５との間に
形成される隙間の開口面積を確保できるようにし
ている。 Furthermore, the side tip shape of the guide wall 9 extending inward from one side edge of the smoke inlet 8 is a first shape.
As shown in Fig. a, the tip of the guide wall 9 is formed as a tapered end 20 diagonally, and the formation of this tapered end 20 secures the opening area of the gap formed between the guide wall 9 and the auxiliary wall 15. I'm trying to make it possible.
次に上記の実施例の作用を説明する。 Next, the operation of the above embodiment will be explained.
まずラビリンス部材４を外側から見た場合、ラ
ビリンス部材４の外周壁７に一定間隔で形成した
煙流入口８の内側には案内壁９が延在されている
ため、煙流入口８に対し矢印Ｂ方向から入射した
光は案内壁９により遮られ、検煙室に入射するこ
とがない。 First, when the labyrinth member 4 is viewed from the outside, the guide wall 9 extends inside the smoke inlet 8 formed at regular intervals on the outer circumferential wall 7 of the labyrinth member 4. Light incident from direction B is blocked by the guide wall 9 and does not enter the smoke detection chamber.
一方、矢印Ａに示すように案内壁９に沿つて煙
流入口８から外乱光が入射した場合には、案内壁
９に沿つた煙流入路１０の端部には補助壁１５が
案内壁９の方向に対し略直交した状態で設けられ
ているため、矢印Ａ方向からの外乱光は補助壁１
５によつて検煙室への入射が遮られ、また矢印Ａ
方向から来た光の補助壁１５による反射光も光の
入射方向に対し略直交する方向に補助壁１５が設
けられているため、その反射光も検煙室に入射す
ることはない。 On the other hand, when disturbance light enters from the smoke inlet 8 along the guide wall 9 as shown by arrow A, an auxiliary wall 15 is placed at the end of the smoke inlet 10 along the guide wall 9. Since it is installed substantially perpendicular to the direction of arrow A, the disturbance light from the direction of arrow A is
5 blocks the entrance into the smoke detection chamber, and arrow A
Since the auxiliary wall 15 is provided in a direction substantially perpendicular to the light incident direction, the reflected light from the auxiliary wall 15 does not enter the smoke inspection chamber.
このため、本考案のラビリンス構造にあつて
は、感知器の設置状態における周囲360度方向及
び上下180度方向のいずれの方向から外乱光の入
射を受けても案内壁９及び補助壁１５によつて検
煙室への入射が遮られ、検煙室に設けた受光素子
６に対するノイズ光の入射を略完全に抑えて受光
素子６による煙の検出感度を大幅に高めることが
できる。 Therefore, in the labyrinth structure of the present invention, the guide wall 9 and the auxiliary wall 15 can be used even if the disturbance light is incident from either the 360-degree circumferential direction or the 180-degree vertical direction when the sensor is installed. As a result, the noise light is blocked from entering the smoke detection chamber, and the incidence of noise light on the light receiving element 6 provided in the smoke detection chamber is substantially completely suppressed, thereby significantly increasing the smoke detection sensitivity of the light receiving element 6.
尚、上記の実施例は、散乱光式の光電式煙感知
器を例にとるものであつたが、本考案はこれに限
定されず、発光素子に相対して受光素子を配置
し、流入した煙による光の減衰を検出する、所謂
減光式煙感知器についてもそのまま適用すること
ができる。 In addition, although the above-mentioned embodiment took a scattered light type photoelectric type smoke detector as an example, the present invention is not limited to this, and the light receiving element is arranged opposite to the light emitting element, and the incoming light is The present invention can also be applied to so-called dimming type smoke detectors that detect the attenuation of light due to smoke.
（考案の効果）
以上説明してきたように本考案によれば、検煙
室を画定する円筒状のラビリンス部材の周壁に一
定間隔で複数の煙流入口を開口し、煙流入口から
内側斜め方向に案内壁を延在すると共に、案内壁
の内側に補助壁を枝状に設けたラビリンス構造を
基本とし、少なくとも受光素子に略相対する位置
の案内壁に設ける補助壁として周壁に対する案内
壁の付け根部分から検煙室略中央に向けて補助壁
を延在させるようにしたため、案内壁に沿つた方
から外乱光の入射を受けても案内壁の方向に略直
交する方向に補助壁が位置するため、案内壁に沿
つた方向からの外乱光の入射を受けても補助壁に
よつて完全に外乱光を遮断することができ、検煙
室に設けた受光素子に対するノイズ光の入射を略
完全に抑えることができ、これによつて煙の検出
感度を大幅に高めることができる。(Effects of the invention) As explained above, according to the invention, a plurality of smoke inlets are opened at regular intervals on the peripheral wall of a cylindrical labyrinth member that defines a smoke detection chamber, and a plurality of smoke inlets are opened diagonally inward from the smoke inlet. The labyrinth structure is basically a labyrinth structure in which a guide wall extends to the inner side of the guide wall and an auxiliary wall is provided in a branch shape inside the guide wall. Since the auxiliary wall extends from the part toward the approximate center of the smoke detection room, even if disturbance light is incident from along the guide wall, the auxiliary wall will be located in a direction approximately perpendicular to the direction of the guide wall. Therefore, even if disturbance light is incident from the direction along the guide wall, the auxiliary wall can completely block the disturbance light, and almost completely prevent noise light from entering the light receiving element installed in the smoke detection room. This makes it possible to significantly increase smoke detection sensitivity.
また、本考案によれば、案内壁の先端を斜めに
形成したので、案内壁の先端における煙の流入特
性を高めて応答性を向上することができるととも
に、案内壁の付け根部分における遮光性を向上す
ることができる。 Furthermore, according to the present invention, since the tip of the guide wall is formed obliquely, it is possible to enhance the smoke inflow characteristics at the tip of the guide wall and improve responsiveness, and also to improve the light shielding property at the base of the guide wall. can be improved.
第１図は本考案の一実施例を示した説明図、第
１ａ図は第１図における案内壁の側面形状を取出
して示した説明図、第２図は従来例を示した説明
図、第３図は第２図の−断面によつて従来構
造を示した説明図である。
１……感知器筐体、３……外部カバー、４……
ラビリンス部材、５……発光素子、６……受光素
子、７……外周壁、８……煙流入口、９……案内
壁、１０……煙流入路、１４……検煙部、１５…
…補助壁、１６……検煙部中心、２０……テーパ
端部。
FIG. 1 is an explanatory diagram showing one embodiment of the present invention, FIG. 1a is an explanatory diagram showing the side shape of the guide wall in FIG. 1, FIG. 2 is an explanatory diagram showing a conventional example, FIG. 3 is an explanatory diagram showing a conventional structure taken along the - cross section of FIG. 1...Sensor housing, 3...External cover, 4...
Labyrinth member, 5... Light emitting element, 6... Light receiving element, 7... Outer peripheral wall, 8... Smoke inlet, 9... Guide wall, 10... Smoke inlet path, 14... Smoke detector, 15...
... Auxiliary wall, 16 ... Center of smoke detection section, 20 ... Tapered end.
Claims (1)
素子からの光の減衰光又は散乱光を受光素子で受
光して電気信号に変換する光電式煙感知器に於い
て、 前記検煙室を画定する円筒状の周壁に一定間隔
で複数の煙流入口を開口し、該煙流入口の側縁の
一方より内側斜め方向に向けて該煙流入口の側縁
の他方を越える位置まで遮光板を兼ねた先端を斜
めに形成した案内壁を延在し、少なくとも受光素
子に略相対した位置の該案内壁の前記周壁内側に
対する付け根部分から前記検煙室の略中心に指向
する方向で且つ煙流入口の他方側から延在された
案内壁の先端を越える内側まで補助壁を枝状に延
在し、該補助壁と案内壁との先端との間に外部か
らの煙を導入する隙間を形成したことを特徴とす
る光電式煙感知器のラビリンス構造。[Scope of claim for utility model registration] A photoelectric smoke detector in which a light receiving element receives attenuated light or scattered light from a light emitting element due to smoke flowing into a smoke detection chamber in a sensor housing and converts it into an electrical signal. A plurality of smoke inlets are opened at regular intervals in a cylindrical peripheral wall defining the smoke detection chamber, and a side edge of the smoke inlet is opened diagonally inward from one of the side edges of the smoke inlet. A guide wall with an oblique tip that also serves as a light-shielding plate is extended to a position beyond the other side of the smoke detection chamber, and from a base portion of the guide wall to the inner side of the peripheral wall at a position substantially opposite to the light receiving element, the guide wall is extended to a position beyond the other side of the smoke detection chamber. The auxiliary wall extends in a branch-like manner to the inside beyond the tip of the guide wall extending from the other side of the smoke inlet in a direction toward the center, and an external wall is provided between the auxiliary wall and the tip of the guide wall. A labyrinth structure of a photoelectric smoke detector characterized by forming a gap through which smoke is introduced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986075195U JPH0441436Y2 (en) | 1986-05-19 | 1986-05-19 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986075195U JPH0441436Y2 (en) | 1986-05-19 | 1986-05-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62186335U JPS62186335U (en) | 1987-11-27 |
| JPH0441436Y2 true JPH0441436Y2 (en) | 1992-09-29 |
Family
ID=30921112
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1986075195U Expired JPH0441436Y2 (en) | 1986-05-19 | 1986-05-19 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0441436Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008310730A (en) * | 2007-06-18 | 2008-12-25 | Panasonic Electric Works Co Ltd | Smoke detector and sensor |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS608864B2 (en) * | 1980-01-24 | 1985-03-06 | 東亜燃料工業株式会社 | Production method of catalyst for diacyloxyalkene synthesis |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS608864U (en) * | 1983-06-30 | 1985-01-22 | ホーチキ株式会社 | Labyrinth structure of photoelectric smoke detector |
-
1986
- 1986-05-19 JP JP1986075195U patent/JPH0441436Y2/ja not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS608864B2 (en) * | 1980-01-24 | 1985-03-06 | 東亜燃料工業株式会社 | Production method of catalyst for diacyloxyalkene synthesis |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62186335U (en) | 1987-11-27 |
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