JP2010231614A - Fire detector - Google Patents

Fire detector Download PDF

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JP2010231614A
JP2010231614A JP2009079916A JP2009079916A JP2010231614A JP 2010231614 A JP2010231614 A JP 2010231614A JP 2009079916 A JP2009079916 A JP 2009079916A JP 2009079916 A JP2009079916 A JP 2009079916A JP 2010231614 A JP2010231614 A JP 2010231614A
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signal line
optical case
optical
light
receiving element
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JP5236547B2 (en
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Kenichi Kato
健一 加藤
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Nohmi Bosai Ltd
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Nohmi Bosai Ltd
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Priority to JP2009079916A priority Critical patent/JP5236547B2/en
Priority to TW099107365A priority patent/TWI480837B/en
Priority to AU2010201098A priority patent/AU2010201098B2/en
Priority to EP10157357.4A priority patent/EP2233916B1/en
Priority to EP14157052.3A priority patent/EP2738546A1/en
Priority to KR1020100026445A priority patent/KR20100108240A/en
Priority to CN201310352824.0A priority patent/CN103514705B/en
Priority to CN201010140737.5A priority patent/CN101847306B/en
Priority to US12/731,574 priority patent/US8294895B2/en
Publication of JP2010231614A publication Critical patent/JP2010231614A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
    • G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/12—Actuation by presence of radiation or particles, e.g. of infrared radiation or of ions

Abstract

<P>PROBLEM TO BE SOLVED: To improve shielding effect of a signal line and avoid effect of noise component. <P>SOLUTION: The fire detector includes: an optical case 21; an element substrate 31, on which a light receiving element 12 is mounted, the element substrate 31 being provided in the optical case 21; a signal line 35 passing through an introduction portion of the peripheral wall 21a of the optical case 21, the signal line 35 being connected to the element substrate 31; and an optical cover 30 for closing an opening of the optical case 21, in which the optical case 21 and the optical cover 30 have conductive outer surfaces, and the signal line 35 contacts the outer surface of the peripheral wall 21a by a signal line holder 41. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

この発明は、炎感知器や煙感知器などの火災感知器に関するものである。   The present invention relates to a fire detector such as a flame detector or a smoke detector.

家屋やビル等の火災監視区域には、煙感知器が配設されている。従来の煙感知器は、筐体（「光学ケース」ともいう）内に、発光素子を有する第１の素子基板と、受光素子を有する第２の素子基板と、が配置され、収容箱内に電源回路や電流制御回路やMPU等を有するメイン基板が配設されているが、前記第１及び第２の素子基板と前記メイン基板との間での信号送受、電源供給等の電気的接続は、信号線を介して行なわれている。前記第１及び第２の素子基板に接続された信号線は、筐体の周壁に設けられた円形状の穴を通って、前記周壁の外面に沿って伸び、前記メイン基板に接続されている（例えば、特許文献１、参照）。   Smoke detectors are installed in fire monitoring areas such as houses and buildings. In a conventional smoke detector, a first element substrate having a light emitting element and a second element substrate having a light receiving element are arranged in a housing (also referred to as an “optical case”), and the inside of the housing box. A main board having a power supply circuit, a current control circuit, an MPU, and the like is disposed, but electrical connection such as signal transmission and reception and power supply between the first and second element boards and the main board is performed. This is done via signal lines. A signal line connected to the first and second element substrates extends along the outer surface of the peripheral wall through a circular hole provided in the peripheral wall of the housing, and is connected to the main substrate. (For example, refer to Patent Document 1).

特開２００８−０８２７０８号公報JP 2008-082708 A

前記煙感知器では、前記信号線は筐体の周壁の穴から前記メイン基板まで、シールドされずに配線されている。そのため、筐体内に存在するノイズ成分が前記信号線の出力に悪影響を及ぼし、煙感知器が誤作動することがある。   In the smoke detector, the signal line is wired without shielding from the hole in the peripheral wall of the housing to the main board. For this reason, noise components present in the housing may adversely affect the output of the signal line, and the smoke detector may malfunction.

この発明は、上記事情に鑑み、信号線のシールド効果を向上させ、ノイズ成分の影響を受けないようにすることを目的とする。   In view of the above circumstances, an object of the present invention is to improve the shielding effect of a signal line so as not to be affected by a noise component.

この発明は、光学ケース内に、受光素子を実装した素子基板が配設され、前記素子基板には、前記光学ケースの周壁の導入部を通る信号線が接続され、前記光学ケースの開口部が光学カバーにより閉鎖されている火災感知器において、前記光学ケース及び前記光学カバーの外面は、導電性を有し、前記信号線は、信号線保持部により周壁の外面に接触していることを特徴とする。   According to the present invention, an element substrate on which a light receiving element is mounted is disposed in an optical case, and a signal line passing through an introduction portion of a peripheral wall of the optical case is connected to the element substrate, and an opening of the optical case is provided. In the fire detector closed by the optical cover, the outer surface of the optical case and the optical cover is conductive, and the signal line is in contact with the outer surface of the peripheral wall by the signal line holding portion. And

この発明は、光学ケースと、前記光学ケース内に配設した受光素子と、前記受光素子の出力信号を増幅する受光増幅部と、増幅された前記出力信号をＡ／Ｄ変換した検出レベルが閾値以上で火災判別する火災判断部と、を備えた火災感知器において、前記光学ケースは、その外面が導電性を有すると共に、前記受光素子が実装された素子基板に接続された信号線を前記外面に接触させる信号線保持部を設けたことを特徴とする。   The present invention relates to an optical case, a light receiving element disposed in the optical case, a light receiving amplification unit for amplifying an output signal of the light receiving element, and a detection level obtained by A / D converting the amplified output signal as a threshold value. In the fire detector including the fire determination unit for determining a fire as described above, the optical case has an outer surface having conductivity, and a signal line connected to an element substrate on which the light receiving element is mounted is connected to the outer surface. A signal line holding portion to be brought into contact with is provided.

この発明は、内部が暗箱である光学ケースと、前記光学ケース内に気体を流入させて検煙部を構成する空気通路と、前記光学ケース内に配設した発光素子と、該発光素子から発光した光が前記検煙部に存在する煙粒子によって生じる散乱光を受光する受光素子と、前記受光素子の出力信号を増幅する受光増幅回路と、増幅された前記出力信号をＡ／Ｄ変換した検出レベルが閾値以上で火災判別する火災判断部と、を備えた火災感知器において、
前記光学ケースは、その外面が導電性を有すると共に、前記受光素子が実装された素子基板に接続された信号線を前記外面に接触させる信号線保持部を設けたことを特徴とする。 The present invention relates to an optical case having a dark box inside, an air passage that constitutes a smoke detecting section by allowing a gas to flow into the optical case, a light emitting element disposed in the optical case, and light emission from the light emitting element Light receiving element that receives scattered light generated by smoke particles existing in the smoke detector, a light receiving amplification circuit that amplifies the output signal of the light receiving element, and detection obtained by A / D conversion of the amplified output signal In a fire detector equipped with a fire determination unit that detects a fire when the level is equal to or higher than a threshold value,
The optical case is characterized in that the outer surface has conductivity, and a signal line holding portion is provided for contacting a signal line connected to an element substrate on which the light receiving element is mounted with the outer surface.

この発明の前記信号線保持部は、前記光学ケースに装着される光学カバーに設けられていることを特徴とする。   The signal line holding part of the present invention is provided in an optical cover attached to the optical case.

この発明は、以上のように構成したので、信号線は確実にシールドされる。そのため、光学ケース内に存在するノイズ成分の影響を受けることがないので、従来例と異なり、ノイズ成分に起因する誤作動の発生を防止することができる。   Since the present invention is configured as described above, the signal line is reliably shielded. Therefore, since it is not affected by the noise component present in the optical case, unlike the conventional example, it is possible to prevent the malfunction caused by the noise component.

本発明の第１実施形態を示す平面図で、煙感知器の概略を示す図である。It is a top view which shows 1st Embodiment of this invention, and is a figure which shows the outline of a smoke detector. 煙検出ユニットを示す斜視図である。It is a perspective view which shows a smoke detection unit. 光学ケースの平面図である。It is a top view of an optical case. 光学カバーの底面図である。It is a bottom view of an optical cover. 煙検出ユニットの側面図である。It is a side view of a smoke detection unit.

本発明の第1実施形態の煙感知器を図１〜図５により説明する。
１は煙感知器、２１は内部が暗箱である煙検出ユニット２の光学ケース、３は該光学ケース２１の検煙部２５に配管４を介して検知対象となる空気を送るファン、５は前記配管４に設けられているフイルタ、をそれぞれ示している。 A smoke detector according to a first embodiment of the present invention will be described with reference to FIGS.
Reference numeral 1 denotes a smoke detector, 21 denotes an optical case of the smoke detection unit 2 which is a dark box, 3 denotes a fan for sending air to be detected to the smoke detection unit 25 of the optical case 21 via a pipe 4, Filters provided in the pipe 4 are shown.

１１は、前記光学ケース２１内に配設された発光素子で、例えば、赤外線を発光する素子である。１２は、フォトダイオード等の受光素子であり、前記発光素子１１の光が前記検煙部２５に存在する煙粒子によって生じる散乱光を受光するものであり、前記発光素子１１の光が直接入射しない位置に配設されている。１４は、前記ファン３や空気の流量を測定するエアフローセンサ１３などに電源を供給する電源部、１５は火災判別部、をそれぞれ示している。   Reference numeral 11 denotes a light emitting element disposed in the optical case 21, for example, an element that emits infrared light. A light receiving element 12 such as a photodiode receives light scattered by the smoke particles present in the smoke detector 25, and the light from the light emitting element 11 is not directly incident. Arranged in position. Reference numeral 14 denotes a power supply unit that supplies power to the fan 3 and the airflow sensor 13 that measures the flow rate of air, and 15 denotes a fire determination unit.

前記火災判別部１５は、前記受光素子１２の出力信号Ｓを増幅する増幅回路、増幅信号を検出レベルに変換するＡ／Ｄ変換器、検出レベルが予め設定された閾値以上になったとき火災と判別する比較回路、等を備えているが、統合的な制御は、ＣＰＵにより行われるようになっている。   The fire discriminating unit 15 includes an amplifier circuit that amplifies the output signal S of the light receiving element 12, an A / D converter that converts the amplified signal to a detection level, and a fire when the detection level exceeds a preset threshold value. A comparison circuit for discriminating is provided, but integrated control is performed by the CPU.

煙検出ユニット２は、箱状の光学ケース２１を備え、該光学ケース２１の開口部は光学カバー３０により閉鎖されている。前記光学ケース２１の外面は、煙検出ユニット２への外部からの電磁波を遮るために導電処理（塗装や蒸着など）されているので、導電性を有しているが、前記導電処理をする代わりに、導電性樹脂により光学ケース２１を形成しても良い。前記光学ケース２１の内部は、例えば、艶消し黒色をなし、いわゆる暗箱となっている。２２は、前記光学ケース２１内に配設された迷光部であり、前記発光素子１１に対向する位置に配設されている。   The smoke detection unit 2 includes a box-shaped optical case 21, and an opening of the optical case 21 is closed by an optical cover 30. The outer surface of the optical case 21 has a conductive treatment (coating, vapor deposition, etc.) in order to block electromagnetic waves from the outside to the smoke detection unit 2. In addition, the optical case 21 may be formed of a conductive resin. The inside of the optical case 21 is a so-called dark box, for example, matte black. Reference numeral 22 denotes a stray light portion disposed in the optical case 21, which is disposed at a position facing the light emitting element 11.

２４は発光素子１１が発光した光を迷光部２２内に設けた光トラップ２３の曲面部に集光させる集光レンズ、２５は空気を通過させる検煙部、２６は適宜間隔に設けられるアパーチャ、をそれぞれ示している。   24 is a condensing lens for condensing the light emitted from the light emitting element 11 on the curved surface portion of the light trap 23 provided in the stray light portion 22, 25 is a smoke detecting portion for allowing air to pass, and 26 is an aperture provided at an appropriate interval, Respectively.

前記受光素子１２は、回路部品３２とともに素子基板３１に実装されている。この素子基板３１の左右の端部は、溝部３３に嵌着支持されている。この溝部３３は、光学ケース２１の周壁２１ａの内側に形成されて、且つ、上下方向に伸びている凹部であるので、前記素子基板３１を上下方向に往復移動させることにより、容易に光学ケース２１に着脱することが出来る。   The light receiving element 12 is mounted on the element substrate 31 together with the circuit component 32. The left and right ends of the element substrate 31 are fitted and supported in the groove 33. Since the groove 33 is a recess formed inside the peripheral wall 21a of the optical case 21 and extending in the vertical direction, the optical case 21 can be easily moved by reciprocating the element substrate 31 in the vertical direction. Can be attached and detached.

前記素子基板３１には、信号線３５が接続されているが、この信号線３５は、例えば、帯状に形成されたフラットケーブルであり、前記素子基板３１等と制御基板（図示省略）との間での信号送受等を行うものである。この信号線３５は、スリット３７を通って前記光学ケース２１の外部に出てから、該光学ケース２１の周壁２１ａの外面に這うように伸びている。   A signal line 35 is connected to the element substrate 31. The signal line 35 is, for example, a flat cable formed in a strip shape, and is between the element substrate 31 and the control board (not shown). Signal transmission / reception, etc. is performed. The signal line 35 extends outside the optical case 21 through the slit 37 and then extends over the outer surface of the peripheral wall 21 a of the optical case 21.

前記スリット３７は、前記周壁２１ａに対して斜めに交差するように形成されているが、この様にすると、直交させる場合に比べ、信号線３５が曲げられて周壁２１ａの外面に這わせやすくなると共に、前記光学ケース２１内に外光が入りにくくなる。更に、信号線３５がスリット３７により軽く挟持されるので、光学ケース２１の外部から信号線３５が引張られても光学ケース２１の内部には伝わらない。又、前記スリット３７の開口部３７ａは、周壁２１ａの上端面２１ｆに連続しているが、この様にすると、信号線３５を上下方向に往復移動させるだけで、該信号線３５を該スリット３７に着脱することができる。従って、信号線３５を素子基板３１に接続した状態で、素子基板３７を光学ケース２１から取り外したり、装着したりすることが出来る。   The slit 37 is formed so as to cross obliquely with respect to the peripheral wall 21a. However, in this case, the signal line 35 is bent and can be easily placed on the outer surface of the peripheral wall 21a as compared with the case where the slit 37 is orthogonal. At the same time, it becomes difficult for outside light to enter the optical case 21. Further, since the signal line 35 is lightly held by the slit 37, even if the signal line 35 is pulled from the outside of the optical case 21, it is not transmitted to the inside of the optical case 21. The opening 37a of the slit 37 is continuous with the upper end surface 21f of the peripheral wall 21a. In this way, the signal line 35 is simply moved back and forth in the up-down direction, and the signal line 35 is moved to the slit 37. It can be attached and detached. Therefore, the element substrate 37 can be removed from or attached to the optical case 21 with the signal line 35 connected to the element substrate 31.

前記光学ケース２１の素子基板３１とスリット３７との間にある信号線の収納部３９には、遮光壁４０が配設されている。この遮光壁４０は、光学ケース２１に固定された遮光壁４０ａと、光学カバー３０に固定された遮光壁４０ｂにより構成され、全体として信号線３５の経路から外光が素子基板３１まで到達しないように囲んで、該信号線３５の経路に沿って設けられている。   A light shielding wall 40 is disposed in the signal line storage portion 39 between the element substrate 31 and the slit 37 of the optical case 21. The light shielding wall 40 includes a light shielding wall 40 a fixed to the optical case 21 and a light shielding wall 40 b fixed to the optical cover 30, so that external light does not reach the element substrate 31 from the path of the signal line 35 as a whole. And is provided along the path of the signal line 35.

前記光学ケース２１の開口部には、光学カバー３０が被せられ、該光学カバー３０はねじ４２で前記光学ケース２１に固定されている。前記光学カバー３０の外面は、煙検出ユニット２への外部からの電磁波を遮るために、導電処理（塗装や蒸着など）されているので、導電性を有しているが、前記導電処理をする代わりに、導電性樹脂により光学カバー３０を形成しても良い。前記光学カバー３０の長辺縁部には、間隔を置いて複数の信号線保持部４１が設けられている。この保持部４１は、前記帯状の信号線３５を前記光学ケース２１の周壁２１ａに接触させて保持させる押圧支持部材であり、光学カバー３０の長辺縁部から垂下する板状片である。   An optical cover 30 is put on the opening of the optical case 21, and the optical cover 30 is fixed to the optical case 21 with screws 42. The outer surface of the optical cover 30 is electrically conductive in order to block electromagnetic waves from the outside to the smoke detection unit 2 (painting, vapor deposition, etc.). Instead, the optical cover 30 may be formed of a conductive resin. A plurality of signal line holding portions 41 are provided at intervals on the long side edge of the optical cover 30. The holding portion 41 is a pressing support member that holds the belt-like signal line 35 in contact with the peripheral wall 21 a of the optical case 21, and is a plate-like piece that hangs down from the long side edge portion of the optical cover 30.

この保持部４１の長さは、信号線３５の帯幅より長く形成され、例えば、スリット３７の長さ（深さ）とほぼ同一長さに形成されている。又、前記保持部４１の内面と周壁２１ａの外面との間隔は、信号線３５の厚さ（帯幅と直交方向の長さ）より僅かに小さく形成され、前記信号線３５を押圧支持できるようになっている。前記保持部４１の数、帯幅、長さ等は必要に応じて適宜選択される。なお、前記光学カバー３０と同様に、前記保持部４１にも導電性を持たせる様にしても良い。   The length of the holding portion 41 is formed to be longer than the band width of the signal line 35, for example, substantially the same length as the length (depth) of the slit 37. Further, the distance between the inner surface of the holding portion 41 and the outer surface of the peripheral wall 21a is formed slightly smaller than the thickness of the signal line 35 (length in the direction orthogonal to the band width) so that the signal line 35 can be pressed and supported. It has become. The number, the width, the length, and the like of the holding portions 41 are appropriately selected as necessary. Note that, similarly to the optical cover 30, the holding portion 41 may be made conductive.

なお、基板用の取付ボスは、全て接地機能を有し、前記ボス表面の蒸着と各基板裏面のランドで接地している。また、光学ケース２１と光学カバー３０に基板取付用ボスを設けることにより、各基板のグランドを経由して前記光学ケース２１と光学カバー３０を同電位にすることが出来る。よって、信号線３５と、光学ケース２１及び光学カバー３０の外面を近づけることにより、両者間に静電容量が生じて耐ノイズ性を高める。   The mounting bosses for the substrate all have a grounding function, and are grounded by vapor deposition on the boss surface and lands on the back surface of each substrate. Further, by providing substrate mounting bosses on the optical case 21 and the optical cover 30, the optical case 21 and the optical cover 30 can be set to the same potential via the ground of each substrate. Therefore, by bringing the signal line 35 close to the outer surface of the optical case 21 and the optical cover 30, an electrostatic capacity is generated between them to improve noise resistance.

本実施形態の作動について説明する。
前記光学ケース２１及び光学カバー３０の外面は、導電性を有しており、又、前記信号線３５は光学ケース２１の周壁２１ａに接触しているので、前記信号線３５はシールドされた状態となっている。従って、前記信号線３５は、前記光学ケース２１内に存在するノイズの影響を受けることがないので、火災判別部は正常な判別を行うことができる。そのため、火災感知器の誤差動を防止することができる。 The operation of this embodiment will be described.
The outer surfaces of the optical case 21 and the optical cover 30 are conductive, and the signal line 35 is in contact with the peripheral wall 21a of the optical case 21, so that the signal line 35 is shielded. It has become. Accordingly, since the signal line 35 is not affected by noise existing in the optical case 21, the fire determination unit can perform normal determination. Therefore, it is possible to prevent error movement of the fire detector.

この発明の第２実施形態について説明する（図示省略）。
本件発明は、煙感知器の他に、発光素子を備えていない火災感知器（炎感知器）にも適用することが出来る。 A second embodiment of the present invention will be described (not shown).
The present invention can be applied to a fire detector (flame detector) that does not include a light emitting element in addition to a smoke detector.

即ち、前記火災感知器は、箱状の光学ケースと、前記光学ケース内に配設した受光素子と、前記受光素子の出力信号を増幅する受光増幅部と、増幅された前記出力信号をＡ／Ｄ変換した検出レベルが閾値以上で火災判別する火災判断部と、前記光学ケースに装着される光学カバーと、を備えており、前記光学ケースは、その外面が導電性を有すると共に、前記受光素子が実装された素子基板に接続された信号線を前記外面に接触させる信号線保持部を設けている。   That is, the fire detector includes a box-shaped optical case, a light receiving element disposed in the optical case, a light receiving amplification unit that amplifies the output signal of the light receiving element, and the amplified output signal as A / A A fire determination unit that detects a fire when the D-converted detection level is equal to or greater than a threshold; and an optical cover that is attached to the optical case. The optical case has an outer surface that is electrically conductive, and the light receiving element. Is provided with a signal line holding portion for contacting a signal line connected to the element substrate on which the is mounted on the outer surface.

なお、前記光学カバー、光学ケース及び前記信号線保持部は、第１実施形態の光学カバー、光学ケース及び信号線保持部と同様である。   The optical cover, the optical case, and the signal line holding unit are the same as the optical cover, the optical case, and the signal line holding unit of the first embodiment.

１ 煙感知器
２ 煙検出ユニット
１１ 発光素子
１２ 受光素子
２１ 光学ケース
２１ａ 周壁
２１ｆ 上端面
３０ 光学カバー
３１ 素子基板
３３ 溝部
３５ 信号線
４１ 信号線保持部 DESCRIPTION OF SYMBOLS 1 Smoke detector 2 Smoke detection unit 11 Light emitting element 12 Light receiving element 21 Optical case 21a Perimeter wall 21f Upper end surface 30 Optical cover 31 Element substrate 33 Groove part 35 Signal line 41 Signal line holding part

Claims (4)

光学ケース内に、受光素子を搭載した素子基板が配設され、前記素子基板には前記光学ケースの周壁の導入部を通る信号線が接続され、前記光学ケースの開口部が光学カバーにより閉鎖されている火災感知器において、
前記光学ケース及び前記光学カバーの外面は、導電性を有し、
前記信号線は、信号線保持部により周壁の外面に接触していることを特徴とする火災感知器。 An element substrate on which a light receiving element is mounted is disposed in the optical case, a signal line passing through the introduction portion of the peripheral wall of the optical case is connected to the element substrate, and the opening of the optical case is closed by an optical cover. Fire detectors
The outer surface of the optical case and the optical cover has conductivity,
The fire detector, wherein the signal line is in contact with the outer surface of the peripheral wall by a signal line holding part. 光学ケースと、前記光学ケース内に配設した受光素子と、前記受光素子の出力信号を増幅する受光増幅部と、増幅された前記出力信号をＡ／Ｄ変換した検出レベルが閾値以上で火災判別する火災判断部と、を備えた火災感知器において、
前記光学ケースは、その外面が導電性を有すると共に、前記受光素子が実装された素子基板に接続された信号線を前記外面に接触させる信号線保持部を設けたことを特徴とする火災感知器。 An optical case, a light receiving element disposed in the optical case, a light receiving amplification unit that amplifies the output signal of the light receiving element, and a fire detection when a detection level obtained by A / D converting the amplified output signal is equal to or greater than a threshold A fire detector comprising:
The optical case is provided with a signal detector that has a conductive outer surface and a signal line holding portion that contacts a signal line connected to an element substrate on which the light receiving element is mounted. . 内部が暗箱である光学ケースと、前記光学ケース内に気体を流入させて検煙部を構成する空気通路と、前記光学ケース内に配設した発光素子と、該発光素子から発光した光が前記検煙部に存在する煙粒子によって生じる散乱光を受光する受光素子と、前記受光素子の出力信号を増幅する受光増幅回路と、増幅された前記出力信号をＡ／Ｄ変換した検出レベルが閾値以上で火災判別する火災判断部と、を備えた火災感知器において、
前記光学ケースは、その外面が導電性を有すると共に、前記受光素子が実装された素子基板に接続された信号線を前記外面に接触させる信号線保持部を設けたことを特徴とする火災感知器。 An optical case whose inside is a dark box, an air passage that constitutes a smoke detecting unit by flowing gas into the optical case, a light emitting element disposed in the optical case, and light emitted from the light emitting element A light-receiving element that receives scattered light generated by smoke particles present in the smoke detector, a light-receiving amplifier circuit that amplifies the output signal of the light-receiving element, and a detection level obtained by A / D converting the amplified output signal is greater than or equal to a threshold value In a fire detector equipped with a fire judgment section for distinguishing fires at
The optical case is provided with a signal detector that has a conductive outer surface and a signal line holding portion that contacts a signal line connected to an element substrate on which the light receiving element is mounted. . 前記信号線保持部は、前記光学ケースに装着される光学カバーに設けられていることを特徴とする請求項１、２、又は、３記載の火災感知器。   4. The fire detector according to claim 1, wherein the signal line holding portion is provided on an optical cover attached to the optical case.
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AU2010201098A AU2010201098B2 (en) 2009-03-27 2010-03-19 Fire detector
EP14157052.3A EP2738546A1 (en) 2009-03-27 2010-03-23 Fire detector
EP10157357.4A EP2233916B1 (en) 2009-03-27 2010-03-23 Fire detector
KR1020100026445A KR20100108240A (en) 2009-03-27 2010-03-24 Fire detection device
CN201310352824.0A CN103514705B (en) 2009-03-27 2010-03-24 Fire detector
CN201010140737.5A CN101847306B (en) 2009-03-27 2010-03-24 Fire detector
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0636161A (en) * 1992-07-17 1994-02-10 Nohmi Bosai Ltd Photoelectric type smoke sensor
JPH08226897A (en) * 1995-02-21 1996-09-03 Nohmi Bosai Ltd Fire detector
JP2008082708A (en) * 2006-09-25 2008-04-10 Nittan Co Ltd Smoke detector
JP2008224222A (en) * 2007-03-08 2008-09-25 Nohmi Bosai Ltd Smoke detector
JP2010231613A (en) * 2009-03-27 2010-10-14 Nohmi Bosai Ltd Fire detector

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0636161A (en) * 1992-07-17 1994-02-10 Nohmi Bosai Ltd Photoelectric type smoke sensor
JPH08226897A (en) * 1995-02-21 1996-09-03 Nohmi Bosai Ltd Fire detector
JP2008082708A (en) * 2006-09-25 2008-04-10 Nittan Co Ltd Smoke detector
JP2008224222A (en) * 2007-03-08 2008-09-25 Nohmi Bosai Ltd Smoke detector
JP2010231613A (en) * 2009-03-27 2010-10-14 Nohmi Bosai Ltd Fire detector

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