JPS63167246A - Scattered light type smoke sensor - Google Patents
Scattered light type smoke sensorInfo
- Publication number
- JPS63167246A JPS63167246A JP31123486A JP31123486A JPS63167246A JP S63167246 A JPS63167246 A JP S63167246A JP 31123486 A JP31123486 A JP 31123486A JP 31123486 A JP31123486 A JP 31123486A JP S63167246 A JPS63167246 A JP S63167246A
- Authority
- JP
- Japan
- Prior art keywords
- light
- smoke
- smoke detection
- emitting element
- dust
- 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.)
- Pending
Links
- 239000000779 smoke Substances 0.000 title claims abstract description 68
- 238000001514 detection method Methods 0.000 claims abstract description 39
- 239000000428 dust Substances 0.000 abstract description 28
- 230000007257 malfunction Effects 0.000 abstract description 6
- 239000011362 coarse particle Substances 0.000 abstract 2
- 230000005494 condensation Effects 0.000 description 14
- 238000009833 condensation Methods 0.000 description 14
- 239000000843 powder Substances 0.000 description 11
- 239000003990 capacitor Substances 0.000 description 6
- 238000005192 partition Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、小型且つ薄型の検煙部を備えた散乱光式煙感
知器に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a scattered light type smoke detector equipped with a small and thin smoke detection section.
（従来技術）
従来、この種の散乱光式煙感知器にあっては、円筒状の
比較的大きな検煙部を感知器内に設け、検煙部に流入し
た煙による発光素子からの光の散乱光を受光素子で受光
し、受光出力が所定煙濃度に対応する閾値を越えたとぎ
に火災検出出力を生ずるように構成している。(Prior art) Conventionally, in this type of scattered light type smoke detector, a relatively large cylindrical smoke detecting section is provided in the sensor, and light from the light emitting element is emitted by smoke flowing into the smoke detecting section. The scattered light is received by a light receiving element, and a fire detection output is generated when the received light output exceeds a threshold value corresponding to a predetermined smoke density.
一方、近年にあっては、検煙部の径を小さくすると共に
、検煙部の高さを従来の３分の１程度と薄くした小型且
つ薄型の散乱光感知器の開発が進められている。On the other hand, in recent years, progress has been made in the development of small and thin scattered light detectors in which the diameter of the smoke detection part has been reduced and the height of the smoke detection part has been reduced to about one third of the conventional one. .
（発明が解決しようとする問題点）
しかしながら、検煙部を小型且つ薄型とした散乱光式煙
感知器にあっては、検煙部を上下に仕切る土壁と下壁と
の間隔が狭いため、土壁及び下壁の間に発光素子及び受
光素子を配置した場合、検煙部の底部となる下壁の表面
に天井面に設置した使用状態でホコリや粉埃等が積るよ
うになり、この検煙部の底に溜ったホコリ等によって発
光素子からの光が散乱されて受光素子に入射したり、検
煙部の上部となる土壁の表面へのホコリの付着や結露等
によって発行素子からの光が散乱されて受光素子に入射
することにより、内乱光による定常レベルが上昇して誤
動作を起こすという問題があった。(Problem to be solved by the invention) However, in the case of a scattered light smoke detector in which the smoke detection section is small and thin, the distance between the earthen wall that partitions the smoke detection section into upper and lower sections and the lower wall is narrow. When the light-emitting element and light-receiving element are placed between the earthen wall and the lower wall, dust and powder may accumulate on the surface of the lower wall, which is the bottom of the smoke detection section, when used on the ceiling. , the light from the light-emitting element is scattered by dust accumulated at the bottom of the smoke detection part and enters the light-receiving element, or it is issued due to dust adhesion or condensation on the surface of the earthen wall that is the upper part of the smoke detection part. There is a problem in that the light from the element is scattered and enters the light receiving element, which increases the steady level due to internal disturbance light, causing malfunction.
（問題点を解決するための手段）
本発明は、このような従来の問題点に鑑みてなされたも
ので、小型且つ薄型とした検煙部の底部に堆積したホコ
リ１））検煙部の上部へのホコリの付着や結露等による
受光出力への影響を低減して長期間にわたり誤動作を防
止できるようにした散乱光式煙感知器を提供することを
目的とする。(Means for Solving the Problems) The present invention has been made in view of the above-mentioned conventional problems. It is an object of the present invention to provide a scattered light type smoke detector that can prevent malfunction over a long period of time by reducing the influence of dust adhesion or dew condensation on the received light output.
この目的を達成するため本発明にあっては、発光素子を
内蔵した発光部ホルダの開口部の下側又は上下側に、検
煙部底面及び上面への光の照ｑ」を遮る遮光部材をひさ
し状に設けるようにしたものである。In order to achieve this object, the present invention includes a light-shielding member on the lower side or upper and lower sides of the opening of the light-emitting unit holder containing the light-emitting element to block the illumination of light to the bottom and top surfaces of the smoke detection unit. It is arranged in the shape of an eave.
（作用）
このような本発明の構成を備えた散乱光式煙感知にあっ
ては、天井面等に設置した使用状態で、倹煙部の底（下
壁）にホコリや粉埃等が堆積しても、発光素子からの光
は発光部ホルダの開口部下側にひさし状に張り出された
遮光部材により底面側へ照射されず、ホコリ等がある程
度積っても受光出力に影響を及ぼすことがなく、更に、
検煙部の天井（上壁）にホコリの付着や結露等があって
も、発光素子からの光は発光部ホルダの開口部の下側又
は上下側にひさし状に張り出された遮光部材により上面
側にも照射されず、ホコリの付着や結露等により受光出
力に影響を及ぼすことなく、高い信頼性が得られる。(Function) In the scattered light type smoke sensor having such a configuration of the present invention, when it is installed on a ceiling surface etc., dust and powder, etc. accumulate on the bottom (lower wall) of the smoke part. Even when the light emitting element is installed, the light from the light emitting element is not irradiated to the bottom side by the light shielding member that extends in the shape of a canopy below the opening of the light emitting unit holder, and even if a certain amount of dust accumulates, it may affect the received light output. There is no, and furthermore,
Even if there is dust or condensation on the ceiling (upper wall) of the smoke detection section, the light from the light emitting element will be blocked by the light shielding member that extends below or above and below the opening of the light emitting section holder. High reliability is achieved because the upper surface is not irradiated and the received light output is not affected by dust or dew condensation.
（実施例）
第１図は本発明の散乱光式煙感知器における検煙部を下
側から児て平面的に示した説明図である。(Example) FIG. 1 is an explanatory diagram showing a smoke detection section in a scattered light type smoke detector of the present invention in a plan view from below.
まず構成を説明すると、ゴは検煙部の上側を仕切る上壁
であり、上壁１の表面には発光部ホルダ２と受光部ホル
ダ３が一体に形成され、発光部ホルダ２の中には発光素
子４が設けられ、または受光部ホルダ３の中には受光索
子５が設けられる。First, to explain the structure, Go is the upper wall that partitions the upper side of the smoke detection section. On the surface of the upper wall 1, a light emitting section holder 2 and a light receiving section holder 3 are integrally formed. Inside the light emitting section holder 2, there is a A light emitting element 4 is provided, or a light receiving cable 5 is provided in the light receiving section holder 3.
発光素子４と受光素子５はその先軸４ａ、５ａに示すよ
うに、対向位置から所定角度ずらして配置されており、
この実施例にあっては、光軸４ａと５ａの交差角θは、
例えばθ−１３５°に設定されている。The light-emitting element 4 and the light-receiving element 5 are arranged at a predetermined angle shifted from their opposing positions, as shown by their front axes 4a and 5a.
In this embodiment, the intersection angle θ between the optical axes 4a and 5a is
For example, it is set to θ-135°.
発光素子４と受光素子５の光軸４ａ、５ａの交差点６の
近傍には遮光部材７が設けられ、発光素子４からの光が
回り込んで直接受光素子５に入射しないようにしている
。更に、遮光部材７に続いて遮光部材８が設けられ、遮
光部材７の先端７ａに結露等を生じた時に、結露等によ
る散乱光が受光素子５に入射することを遮光部材８によ
って防いでいる。A light shielding member 7 is provided near the intersection 6 of the optical axes 4a and 5a of the light emitting element 4 and the light receiving element 5 to prevent light from the light emitting element 4 from going around and directly entering the light receiving element 5. Further, a light shielding member 8 is provided following the light shielding member 7, and when dew condensation or the like occurs at the tip 7a of the light shielding member 7, the light shielding member 8 prevents scattered light due to the condensation from entering the light receiving element 5. .
検煙部の周壁を形成する手段としてくの字形状をもった
複数の隔壁９が所定の煙流入間隔を空けて円周上に配置
されている。更に、発光部ホルダ２と受光部ホルダ３の
間の光測の周壁部分には、コンデンサ収納部１０が設け
られ、上壁１の上部に組込まれるプリント基板に実装し
たコンデンサをコンデンサ収納部１０内に組込めるよう
にしている。As means for forming the peripheral wall of the smoke detection section, a plurality of dogleg-shaped partition walls 9 are arranged on the circumference at predetermined smoke inflow intervals. Furthermore, a capacitor housing part 10 is provided in the peripheral wall of the photometer between the light emitting part holder 2 and the light receiving part holder 3, and a capacitor mounted on a printed circuit board incorporated in the upper part of the upper wall 1 is stored in the capacitor storing part 10. We are making it possible to incorporate it into.
発光素子４を内蔵した発光部ホルダ２は、発光素子４の
発光面側に２つの間口部１１．１２を有し、開口部１２
の外側にひさし状の遮光部材１４を設けている。The light-emitting unit holder 2 that incorporates the light-emitting element 4 has two openings 11 and 12 on the light-emitting surface side of the light-emitting element 4.
A canopy-shaped light shielding member 14 is provided on the outside.
第２図は第１図の発光部ホルダ２を取り出して示したも
ので、上壁１の下部に一体に形成された発光部ホルダ２
の素子収納部１５に発光素子４を組込むとともに、この
発光素子４の組込み状態で下側から押え部材１６を組入
れて発光素子４を固定しており、この押え部材１６の組
込みで発光素子４の前面に２つの開口部１１．１２が形
成される。間口部１２の外側下部には遮光部材１４がひ
さし状に張り出されており、発光素子４からの光の下側
への照射を遮光部材１４で規制している。FIG. 2 shows the light emitting unit holder 2 taken out from FIG.
The light-emitting element 4 is installed in the element storage part 15 of the device storage part 15, and a holding member 16 is inserted from below in the assembled state of the light-emitting element 4 to fix the light-emitting element 4. Two openings 11.12 are formed on the front side. A light shielding member 14 is projected in the shape of a canopy at the outer lower part of the frontage portion 12, and the light shielding member 14 restricts the irradiation of light from the light emitting element 4 to the lower side.
第３図は第１．２図に示した倹煙部を組込んだ光電式煙
感知器の断面図を示す。FIG. 3 shows a sectional view of a photoelectric smoke detector incorporating the smoke exhalation section shown in FIG. 1.2.
第３図において、１８は本体カバーであり、本体カバー
１８の上側が天井面等に固着された感知器ベースに着脱
自在に装着される。本体カバー１８の下部中央には煙流
入口１つを備えた外カバー２０が装着され、この外カバ
ー２０の中に検煙部２１が組込まれる。倹煙部２１は上
壁１によって上部に仕切られると共に、外カバー２０に
設けた下壁２２によって下部が仕切られ、このように上
下に仕切られた検煙部２１内には上壁１に一体に９Ωけ
た発光部ホルダ２及び受光部ホルダ３が配置される。In FIG. 3, 18 is a main body cover, and the upper side of the main body cover 18 is detachably attached to a sensor base fixed to a ceiling surface or the like. An outer cover 20 having one smoke inlet is attached to the center of the lower part of the main body cover 18, and a smoke detection section 21 is incorporated into this outer cover 20. The smoke detecting section 21 is partitioned into an upper part by the upper wall 1 and a lower part by a lower wall 22 provided on the outer cover 20. Inside the smoke detecting part 21, which is vertically partitioned in this way, there are parts that are integrated with the upper wall 1. A light emitting unit holder 2 and a light receiving unit holder 3 are arranged with a resistance of 9Ω.
また、倹煙部２１の上壁１の上部には感知器回路を実装
したプリント基板２３が設けられ、プリン１−基板２３
としては両面パターンをもったものが使用され、上面に
回路パターンを形成してチップ化した回路部品を組込む
と共に、プリント基板２３の下面は前面銅箔とし、感知
器回路のシールド板を形成している。更に、プリント基
板２３の上部にはシールドケース２４が設けられる。勿
論、プリント基板２３の感知器回路で用いるコンデンサ
は第１図に示したように、検煙部２１に突出されたコン
デンサ収納部１０の中に組込まれるようになる。Further, a printed circuit board 23 on which a sensor circuit is mounted is provided on the upper part of the upper wall 1 of the smoke section 21.
The printed circuit board 23 has a double-sided pattern, and a circuit pattern is formed on the upper surface to incorporate chipped circuit components, and the lower surface of the printed circuit board 23 is made of front copper foil to form a shield plate for the sensor circuit. There is. Furthermore, a shield case 24 is provided above the printed circuit board 23. Of course, the capacitors used in the sensor circuit on the printed circuit board 23 are incorporated into the capacitor storage section 10 protruding from the smoke detection section 21, as shown in FIG.
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.
第３図に示す天井面に取り付けた使用状態において、検
煙部２１に対しては外部からの空気の流通があることか
ら、長期間使用している間に検煙部２１の底面となる下
壁２２の表面にホコリや粉埃３０が堆積するようになる
。このような検煙部底面のホコリや粉埃３０の堆積に対
し、発光部ホルダ２に組込んだ発光素子４からの光が堆
積したホコリや粉埃３０に照射されて散乱し、受光素子
５の受光出力に影響を及ぼすが、本発明にあっては、発
光部ホルダ２の開口部下側にひさし状に遮光部材１４を
張り出していることから、検煙部２１の底部に溜ったホ
コリや粉埃３０に対する発光素子４からの光の照射が遮
られ、検煙部２１の底面にホコリや粉埃３０が溜っても
発光素子４からの光の照射による散乱光を生じないため
ホコリや粉埃３０の堆積で受光素子５の受光出力が上昇
して誤動作を起こしてしまうことを長期間に亘って抑制
することができる。In the usage condition where it is attached to the ceiling surface as shown in Fig. 3, since there is air circulation to the smoke detection part 21 from the outside, the bottom surface of the smoke detection part 21 becomes the bottom surface during long-term use. Dust and powder 30 begin to accumulate on the surface of the wall 22. With respect to such accumulation of dust and powder 30 on the bottom surface of the smoke detection section, light from the light emitting element 4 incorporated in the light emitting section holder 2 is irradiated and scattered by the accumulated dust and powder 30, and the light receiving element 5 However, in the present invention, since the light shielding member 14 is protruded in the shape of a canopy below the opening of the light emitting unit holder 2, dust and powder accumulated at the bottom of the smoke detection unit 21 can be removed. Irradiation of light from the light emitting element 4 to the dust 30 is blocked, and even if dust or powder 30 accumulates on the bottom surface of the smoke detection section 21, scattered light will not be generated due to light irradiation from the light emitting element 4. It is possible to suppress over a long period of time that the light-receiving output of the light-receiving element 5 increases due to the accumulation of particles 30, which causes malfunction.
第４図は、本発明の他め実施例を示した説明図であり、
この実施例にあっては、発光部ホルダ２の開口部にひさ
し状に張り出された遮光部材を設けるようにしたもので
ある。発光部ホルダ２の開口部下側にひさし状に張り出
された遮光部材１４については、上記の実施例で説明し
たように、検煙部２１の底部に溜ったホコリや粉埃に対
する発光素子４からの光の照射が遮られ、検煙部２１の
底にホコリや粉埃が溜っても発光素子４からの光の照射
による散乱光を生じないために、ホコリや粉埃の堆積で
受光素子５の受光出力に影響を与えないものである。FIG. 4 is an explanatory diagram showing another embodiment of the present invention,
In this embodiment, a light shielding member extending in the shape of a canopy is provided at the opening of the light emitting unit holder 2. As explained in the above embodiment, the light-shielding member 14 extending like a canopy below the opening of the light-emitting unit holder 2 protects the light-emitting element 4 from dust and dirt accumulated at the bottom of the smoke detection unit 21. Even if the light irradiation from the light emitting element 4 is blocked and dust and dust accumulates at the bottom of the smoke detection section 21, scattered light will not be generated due to the light irradiation from the light emitting element 4. It does not affect the received light output.
本実施例にあっては、遮光部材１４の他に、更に発光部
ホルダ２の開口部上側にひさし状に張り出された遮光部
材３０を設けるようにしたものでおる。即ち、検煙部２
１に対しては、外部からの空気の流通があることから、
検煙部２１の上面となる上壁１の表面にホコリや粉埃等
が付着したり、結露が発生して発光素子４からの光が上
壁１に付着したホコリや結露等に照射されて散乱し、受
光素子５の受光出力に影響を及ぼすが、発光本発明にあ
っては、発光部ホルダ２の開口部上側にひさし状に遮光
部材３０を設Ｃプるこから、検煙部２１の上部に付着し
たホコリや結露等に対する発光素子４からの光の照射が
遮られ、検煙部２１の上部に付着したホコリや結露等に
より発光素子４からの光の照射による散乱光を生じたな
いため、ホコリや結露等で受光素子５の受光出力は影響
を受けなくなる。In this embodiment, in addition to the light-shielding member 14, a light-shielding member 30 is provided above the opening of the light-emitting unit holder 2, projecting like a canopy. That is, smoke detection section 2
For 1, since there is air circulation from the outside,
Dust, powder, etc. may adhere to the surface of the upper wall 1, which is the upper surface of the smoke detection section 21, or condensation may occur, and the light from the light emitting element 4 may be irradiated onto the dust, condensation, etc. that has adhered to the upper wall 1. Although the light is scattered and affects the light receiving output of the light receiving element 5, in the present invention, the light shielding member 30 is provided in the shape of an eave above the opening of the light emitting unit holder 2. The irradiation of light from the light emitting element 4 to the dust, dew condensation, etc. adhering to the upper part of the smoke detection part 21 was blocked, and scattered light was generated due to the irradiation of light from the light emitting element 4 due to the dust, dew condensation, etc. adhering to the upper part of the smoke detection part 21. Therefore, the light receiving output of the light receiving element 5 is not affected by dust, dew condensation, etc.
従って、発光部ホルダ２０閤口部上下側にひさし状に張
り出された遮光部材１４．３０を設けることにより、検
煙部の底部に溜ったホコリや粉埃等による受光出力への
影響及び検煙部２１の上部に付着したホコリや結露等に
よる受光出力への影響をなくすことができるので、内乱
光によって受光出力が上昇して誤動作を起こすことを略
完全に抑えることができ、更に信頼性の高いものとなる
。Therefore, by providing the light shielding members 14, 30 projecting like eaves on the upper and lower sides of the opening of the light emitting unit holder 20, it is possible to prevent the influence of dust, powder, etc. accumulated at the bottom of the smoke detection unit on the light reception output and the detection. Since it is possible to eliminate the influence of dust and dew condensation on the light receiving output attached to the upper part of the smoke part 21, it is possible to almost completely suppress the occurrence of malfunctions due to an increase in the light receiving output due to internal light disturbance, further improving reliability. will be of high value.
第５図は、本発明の他の実施例を示した説明図であり、
この実施例にあっては、発光部ホルダ２の開口部下側に
ひさし状に張り出された遮光部材の先端を鋭角的にした
ものである。即ち、上記の実施例のように遮光部材の先
端が平坦であると、先端に結露等を生じた場合、乱反射
の原因となり、受光出力に影響を与えることになる。本
発明にあっては、遮光部材１４の先端を鋭角的にしたこ
とにより、先端に結露等を生じた場合の乱反射による受
光出力への影響を抑制したものである。FIG. 5 is an explanatory diagram showing another embodiment of the present invention,
In this embodiment, the tip of the light-shielding member extending in the shape of a canopy below the opening of the light-emitting unit holder 2 is made to have an acute angle. That is, if the tip of the light shielding member is flat as in the above embodiment, if dew condensation or the like occurs on the tip, it will cause diffuse reflection and affect the light reception output. In the present invention, by making the tip of the light shielding member 14 acute-angled, the influence on the light reception output due to diffused reflection when dew condensation or the like occurs at the tip is suppressed.
（発明の効果〉
以上説明してぎたように本発明によれば、発光素子を内
蔵した発光部ホルダの開口部下側又は上下側に検煙部底
面及び又は上面への光の照射を遮る遮光部材をひさし状
に設けるようにしたため、検煙部を小型且つ薄型とした
ことで、検煙部の底面に溜ったホコリや粉埃による散乱
光の受光出力への影響を受は易くなっても、ホルダ開口
部下側に設けた遮光部材による底部側への光の照射によ
る底部からの散乱光を遮断して防止することができ、検
煙部底面にホコリや粉埃等が溜っても長期間に亘って誤
動作を起こすことのない信頼性の高い散乱光式煙感知器
を実現することができる。(Effects of the Invention) As described above, according to the present invention, a light-shielding member is provided below or above and below the opening of the light-emitting unit holder containing a built-in light-emitting element to block light from irradiating the bottom and/or top of the smoke detection unit. Since the smoke detector is provided in the shape of an eave, the smoke detection part is small and thin, so even though the light reception output is easily affected by scattered light due to dust and powder accumulated on the bottom of the smoke detection part, The light shielding member installed at the bottom of the holder opening can block and prevent scattered light from the bottom due to irradiation of light to the bottom side, and even if dust or powder accumulates on the bottom of the smoke detector, it can be prevented for a long time. It is possible to realize a highly reliable scattered light smoke detector that does not malfunction over time.
第１図は本発明の検煙部を下側から見て平面的に示した
断面図、第２図は第１図の発光部ホルダを取出して示し
た断面図、第３図は第１図の検煙部を備えた感知器の断
面図、第４，５図は本発明におりる発光部ホルダの他の
実施例を示した断面図である。
１：土壁
２：発光部ホルダ
３：受光部ホルダ
４：発光素子
５：受光素子
６：光軸の交差点
７．８：遮光部材
９：隔壁
１０：コンデンサ収納部
’１１，１２：開口部
１４．３０：遮光部材
１６：押え部材
１８二本体カバー
１９：煙流入口
２０：外カバー
２１：検煙部
２２：下壁
２３ニブリント基板
２４：シールドケースFig. 1 is a cross-sectional view of the smoke detector of the present invention viewed from below, Fig. 2 is a cross-sectional view of the light emitting unit holder of Fig. 1 taken out, and Fig. 3 is the same as Fig. 1. Figures 4 and 5 are cross-sectional views showing other embodiments of the light emitting unit holder according to the present invention. 1: Earthen wall 2: Light emitting unit holder 3: Light receiving unit holder 4: Light emitting element 5: Light receiving element 6: Intersection of optical axis 7.8: Light shielding member 9: Partition wall 10: Capacitor housing '11, 12: Opening 14 .30: Light shielding member 16: Holding member 18 Two body covers 19: Smoke inlet 20: Outer cover 21: Smoke detection section 22: Lower wall 23 Niblint board 24: Shield case
Claims (1)
ずらして配置し、該検煙部に流入した煙による前記発光
素子からの光の散乱光を前記受光素子で受光して火災を
検出する散乱光式煙感知器に於いて、 前記発光素子を内蔵した発光部ホルダの開口部下側又は
上下側に、検煙部底面へ光の照射を遮る遮光部材をひさ
し状に設けたことを特徴とする散乱光式煙感知器。[Scope of Claims] A light-emitting element and a light-receiving element are arranged in a smoke detection section at a predetermined angle shifted from opposing positions, and the light-receiving element receives scattered light from the light-emitting element caused by smoke flowing into the smoke detection section. In a scattered light type smoke detector that detects fire by detecting a fire, a light-shielding member is provided in the shape of a canopy on the lower side or upper and lower sides of the opening of the light-emitting unit holder containing the light-emitting element to block the irradiation of light to the bottom surface of the smoke detection unit. A scattered light type smoke detector characterized by the following:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31123486A JPS63167246A (en) | 1986-12-27 | 1986-12-27 | Scattered light type smoke sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31123486A JPS63167246A (en) | 1986-12-27 | 1986-12-27 | Scattered light type smoke sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63167246A true JPS63167246A (en) | 1988-07-11 |
Family
ID=18014705
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31123486A Pending JPS63167246A (en) | 1986-12-27 | 1986-12-27 | Scattered light type smoke sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63167246A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0341394U (en) * | 1989-08-30 | 1991-04-19 | ||
| JP2003141652A (en) * | 2001-10-31 | 2003-05-16 | Nohmi Bosai Ltd | Photoelectric smoke sensor |
| JP2009110434A (en) * | 2007-10-31 | 2009-05-21 | New Cosmos Electric Corp | Photoelectric smoke sensor |
| WO2019181275A1 (en) * | 2018-03-22 | 2019-09-26 | パナソニックＩｐマネジメント株式会社 | Smoke detector |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5578396A (en) * | 1978-12-08 | 1980-06-12 | Matsushita Electric Ind Co Ltd | Smoke sensor |
| JPS5716955B2 (en) * | 1977-04-20 | 1982-04-08 |
-
1986
- 1986-12-27 JP JP31123486A patent/JPS63167246A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5716955B2 (en) * | 1977-04-20 | 1982-04-08 | ||
| JPS5578396A (en) * | 1978-12-08 | 1980-06-12 | Matsushita Electric Ind Co Ltd | Smoke sensor |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0341394U (en) * | 1989-08-30 | 1991-04-19 | ||
| JP2003141652A (en) * | 2001-10-31 | 2003-05-16 | Nohmi Bosai Ltd | Photoelectric smoke sensor |
| JP2009110434A (en) * | 2007-10-31 | 2009-05-21 | New Cosmos Electric Corp | Photoelectric smoke sensor |
| WO2019181275A1 (en) * | 2018-03-22 | 2019-09-26 | パナソニックＩｐマネジメント株式会社 | Smoke detector |
| JP2019168830A (en) * | 2018-03-22 | 2019-10-03 | パナソニックＩｐマネジメント株式会社 | smoke detector |
| TWI725400B (en) * | 2018-03-22 | 2021-04-21 | 日商松下知識產權經營股份有限公司 | Smoke detector |
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