JP2000065741A - Photoelectric detector - Google Patents
Photoelectric detectorInfo
- Publication number
- JP2000065741A JP2000065741A JP10238133A JP23813398A JP2000065741A JP 2000065741 A JP2000065741 A JP 2000065741A JP 10238133 A JP10238133 A JP 10238133A JP 23813398 A JP23813398 A JP 23813398A JP 2000065741 A JP2000065741 A JP 2000065741A
- Authority
- JP
- Japan
- Prior art keywords
- light
- optical
- photoelectric sensor
- trap
- emitting device
- 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.)
- Withdrawn
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、煙粒子等を検知す
るために用いられる光電式感知器に関するものである。[0001] 1. Field of the Invention [0002] The present invention relates to a photoelectric sensor used for detecting smoke particles and the like.
【０００２】[0002]
【従来の技術】従来の光電式感知器を図２及び図３を用
いて説明する。図２は光電式感知器の外観を示す斜視図
であり、図３は光電式感知器の光学室内を示す断面図で
ある。2. Description of the Related Art A conventional photoelectric sensor will be described with reference to FIGS. FIG. 2 is a perspective view showing an appearance of the photoelectric sensor, and FIG. 3 is a sectional view showing an optical chamber of the photoelectric sensor.
【０００３】この種の光電式感知器は、特開昭６３―１
６３６９５号公報等で提案されている。すなわち、それ
ぞれの光軸を交差させる形で光学室２内に配置された投
光素子４と受光素子５とを備え、投光素子４の投光領域
と受光素子５の受光領域とが重合する領域である検知領
域における煙や粉塵などの粒子をによる投光素子４から
の光の散乱光を受光素子５にて受光することにより粒子
を検出するものである。光学室２を形成するケース１は
煙や粉塵等の粒子が流入しやすいが外光は入りにくいラ
ビリンス構造としてある。なお、図３に示す光電式感知
器にあっては、壁体１２によりラビリンス構造が形成さ
れている。[0003] This type of photoelectric sensor is disclosed in JP-A-63-1.
63695 and the like. That is, the light emitting device includes a light projecting element 4 and a light receiving element 5 arranged in the optical chamber 2 in such a manner that their optical axes cross each other. In the detection area, which is a region, particles are detected by receiving light scattered from the light projecting element 4 by light receiving elements 5 due to particles such as smoke and dust. The case 1 forming the optical chamber 2 has a labyrinth structure in which particles such as smoke and dust easily flow in, but hardly receive external light. In the photoelectric sensor shown in FIG. 3, a labyrinth structure is formed by the wall 12.
【０００４】[0004]
【発明が解決しようとする課題】上述のような構成の光
電式感知器にあっては、投光素子４からの光が光学室２
の内壁や内壁に堆積した埃等によって反射され、その光
が迷光となって受光素子５に達し、光学的なＳ／Ｎ比が
悪化してしまうことがあった。In the photoelectric sensor having the above-described structure, the light from the light projecting element 4 is transmitted to the optical chamber 2 by the light.
In some cases, the light is reflected by the inner wall or dust accumulated on the inner wall, and the light reaches the light receiving element 5 as stray light, thereby deteriorating the optical S / N ratio.
【０００５】そこで、光学室２内において投光素子４に
対向する位置に光トラップを設け、迷光の原因となる不
要な照射光を光トラップの内壁に複数回反射させて減衰
し、再び光学室２内に戻さないようにするものがある。Therefore, an optical trap is provided in the optical chamber 2 at a position facing the light projecting element 4, and unnecessary irradiation light which causes stray light is reflected and attenuated by the inner wall of the optical trap a plurality of times, and is attenuated again. There are things that do not return inside 2.
【０００６】ところが、投光素子４に用いる素子の性能
や光学室２内に生じる埃等により、投光素子４からの光
が広がってしまうことがある。従って、投光素子４から
の光の広がりを考慮して予め光トラップの開口を大きく
しておく必要があるとともに、それに伴って大きな光ト
ラップを設置しなければならないという問題点を有して
いた。However, the light from the light projecting element 4 may spread due to the performance of the element used for the light projecting element 4 or dust generated in the optical chamber 2. Therefore, it is necessary to increase the opening of the optical trap in advance in consideration of the spread of the light from the light projecting element 4 and to install a large optical trap accordingly. .
【０００７】本発明は、上記の問題点に鑑みて成された
ものであり、その目的とするところは、光学的なＳ／Ｎ
比を悪化させることなく、一層の小型化を図った光電式
感知器を提供することにある。[0007] The present invention has been made in view of the above problems, and an object thereof is to provide an optical S / N.
An object of the present invention is to provide a photoelectric sensor that is further downsized without deteriorating the ratio.
【０００８】[0008]
【課題を解決するための手段】請求項１記載の発明は、
れぞれ光軸を交差させる形で光学室内に配置された投光
素子と受光素子とを備え、投光素子の投光領域と受光素
子の受光領域とが重合する領域である検知領域における
煙や粉塵などの粒子による投光素子からの光の散乱光を
受光素子にて受光することにより粒子を検出する光電式
感知器において、投光素子と対向する位置に、集光手段
及び光トラップを備え、集光手段により投光素子からの
光を光トラップの開口に集光するようにしたことを特徴
とするものである。According to the first aspect of the present invention,
A light-emitting element and a light-receiving element arranged in the optical chamber so that the optical axes cross each other, and smoke in a detection area, which is an area where the light-emitting area of the light-emitting element and the light-receiving area of the light-receiving element overlap. In a photoelectric sensor that detects particles by receiving light scattered from the light emitting element due to particles such as dust and dust by the light receiving element, a light collecting means and an optical trap are placed at a position facing the light emitting element. A light condensing means for condensing the light from the light projecting element to the opening of the optical trap.
【０００９】[0009]
【発明の実施の形態】以下、本発明の一実施の形態につ
いて図１乃至図３に基づき詳細に説明する。図１は本発
明の一実施の形態に係る光電式感知器を示す平面図であ
る。なお、従来の技術の欄において説明した光電式感知
器と同等の箇所には同じ番号を付し、その詳細な説明は
省略する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS. FIG. 1 is a plan view showing a photoelectric sensor according to an embodiment of the present invention. The same parts as those of the photoelectric sensor described in the section of the related art are denoted by the same reference numerals, and detailed description thereof will be omitted.
【００１０】本実施の形態に係る光電式感知器が従来の
光電式感知器と相違するところは以下の点である。すな
わち、投光素子４と対向する位置に、レンズ等からなる
集光手段Ｇ及び光トラップＴを備え、集光手段Ｇにより
投光素子４からの光を光トラップＧの開口Ｔ１内に集光
するようにしたことを特徴とするものである。なお、光
トラップＴの形状については特に制限はないが、光トラ
ップＴに入射した光が内壁に反射することにより十分減
衰され、再び光学室２内に戻りにくいものであれば特に
制限はない。[0010] The photoelectric sensor according to the present embodiment differs from the conventional photoelectric sensor in the following points. That is, a light condensing means G including a lens or the like and a light trap T are provided at a position facing the light projecting element 4, and the light from the light projecting element 4 is condensed into the opening T 1 of the light trap G by the light condensing means G. It is characterized by doing so. The shape of the optical trap T is not particularly limited, but is not particularly limited as long as the light incident on the optical trap T is sufficiently attenuated by being reflected on the inner wall and is difficult to return to the optical chamber 2 again.
【００１１】図１に示す光電式感知器にあっては、開口
Ｔ１から進むにつれて開口面積が徐々に小さくなる形状
の光トラップＴを用いている。従って、侵入した光が内
部を進むにつれて内壁に反射する単位時間あたりの回数
が多くなり、侵入した光を効率よく減衰させることが可
能になるものである。なお、集光手段Ｇに反射して迷光
が生じることを防ぐために、集光手段Ｇはできるだけ反
射率の低いものを用いることが望ましい。In the photoelectric sensor shown in FIG. 1, an optical trap T having a shape in which the opening area gradually decreases as it proceeds from the opening T1 is used. Therefore, as the invading light travels inside, the number of times of reflection per unit time increases on the inner wall, and the invading light can be efficiently attenuated. In order to prevent stray light from being reflected by the light collecting means G, it is desirable to use a light collecting means G having a reflectance as low as possible.
【００１２】本実施の形態に係る光電式感知器によれ
ば、光トラップＴの開口Ｔ１を予め大きくしておかなく
ても、集光手段Ｇにより広がろうとする投光素子４から
の光を光トラップＴの開口Ｔ１に集光させることが可能
になるため、光トラップＴの大きさを従来のものと比較
してコンパクトなものにすることが可能になる。従っ
て、本実施の形態に係る光電式感知器によれば、迷光に
よる光学的なＳ／Ｎ比の悪化をコンパクトな光トラップ
Ｔにより低減することが可能になるため、光学的なＳ／
Ｎ比を悪化させることなく、一層の小型化を図った光電
式感知器を提供することができるという効果を奏する。According to the photoelectric sensor according to the present embodiment, the light from the light projecting element 4 which is to be spread by the light condensing means G can be used without making the opening T1 of the optical trap T large in advance. Since the light can be focused on the opening T1 of the light trap T, the size of the light trap T can be made smaller than that of the conventional one. Therefore, according to the photoelectric sensor according to the present embodiment, the deterioration of the optical S / N ratio due to stray light can be reduced by the compact optical trap T.
There is an effect that it is possible to provide a photoelectric sensor that is further downsized without deteriorating the N ratio.
【００１３】[0013]
【発明の効果】以上のように、請求項１記載の発明にあ
っては、れぞれ光軸を交差させる形で光学室内に配置さ
れた投光素子と受光素子とを備え、投光素子の投光領域
と受光素子の受光領域とが重合する領域である検知領域
における煙や粉塵などの粒子による投光素子からの光の
散乱光を受光素子にて受光することにより粒子を検出す
る光電式感知器において、投光素子と対向する位置に、
集光手段及び光トラップを備え、集光手段により投光素
子からの光を光トラップの開口に集光するようにしたの
で、光トラップの開口を大きくしなくても投光素子から
の光を光トラップの開口に集光させることが可能になる
ため、光学的なＳ／Ｎ比の悪化を防ぐ光トラップをコン
パクトにすることが可能となり、光学的なＳ／Ｎ比を悪
化させることなく、一層の小型化を図った光電式感知器
を提供することが可能になるという効果を奏する。As described above, according to the first aspect of the present invention, there is provided a light projecting element and a light receiving element which are arranged in an optical chamber so as to intersect with each other. The photoelectric detector detects particles by receiving light scattered from the light emitting element due to particles such as smoke and dust in the detection area where the light emitting area of the light receiving element and the light receiving area of the light receiving element overlap. In the type sensor, at a position facing the light emitting element,
The light condensing means and the light trap are provided, and the light from the light projecting element is condensed on the opening of the light trap by the light condensing means, so that the light from the light projecting element can be transmitted without increasing the opening of the light trap. Since it is possible to collect light at the opening of the optical trap, it is possible to make the optical trap that prevents deterioration of the optical S / N ratio compact, and without deteriorating the optical S / N ratio. There is an effect that it is possible to provide a photoelectric sensor which is further downsized.
【図面の簡単な説明】[Brief description of the drawings]
【図１】本発明の一実施の形態に係る光電式感知器を示
す平面図である。FIG. 1 is a plan view showing a photoelectric sensor according to an embodiment of the present invention.
【図２】従来の光電式感知器の外観を示す斜視図であ
る。FIG. 2 is a perspective view showing the appearance of a conventional photoelectric sensor.
【図３】従来の光電式感知器の光学室内を示す断面図で
ある。FIG. 3 is a sectional view showing an optical chamber of a conventional photoelectric sensor.
１ ケース ２ 光学室 ４ 投光素子 ５ 受光素子 １２ 壁体 Ｇ 集光手段 Ｔ 光トラップ Ｔ１ 開口 DESCRIPTION OF SYMBOLS 1 Case 2 Optical room 4 Light emitting element 5 Light receiving element 12 Wall G Light collecting means T Light trap T1 Opening
フロントページの続き (72)発明者 西川 尚之 大阪府門真市大字門真1048番地松下電工株 式会社内 (72)発明者 下村 茂樹 大阪府門真市大字門真1048番地松下電工株 式会社内 Ｆターム(参考） 2G059 AA05 BB01 CC19 EE02 JJ11 JJ30 KK01 LL04 NN01 NN07 5C085 AA03 AB01 BA33 CA30 FA10 FA20 Continuing from the front page (72) Inventor Naoyuki Nishikawa 1048 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Works, Ltd. 2G059 AA05 BB01 CC19 EE02 JJ11 JJ30 KK01 LL04 NN01 NN07 5C085 AA03 AB01 BA33 CA30 FA10 FA20
Claims (1)
に配置された投光素子と受光素子とを備え、投光素子の
投光領域と受光素子の受光領域とが重合する領域である
検知領域における煙や粉塵などの粒子による投光素子か
らの光の散乱光を受光素子にて受光することにより粒子
を検出する光電式感知器において、投光素子と対向する
位置に、集光手段及び光トラップを備え、集光手段によ
り投光素子からの光を光トラップの開口に集光するよう
にしたことを特徴とする光電式感知器。1. A detection device comprising: a light projecting element and a light receiving element arranged in an optical chamber so as to intersect an optical axis, wherein a light projecting area of the light projecting element and a light receiving area of the light receiving element overlap. In a photoelectric sensor that detects particles by receiving light scattered light from the light emitting element due to particles such as smoke and dust in the area with a light receiving element, at a position opposed to the light emitting element, a light collecting means and A photoelectric sensor comprising an optical trap, wherein light from the light projecting element is focused on an opening of the optical trap by a focusing means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10238133A JP2000065741A (en) | 1998-08-25 | 1998-08-25 | Photoelectric detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10238133A JP2000065741A (en) | 1998-08-25 | 1998-08-25 | Photoelectric detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000065741A true JP2000065741A (en) | 2000-03-03 |
Family
ID=17025687
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10238133A Withdrawn JP2000065741A (en) | 1998-08-25 | 1998-08-25 | Photoelectric detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000065741A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2413381A (en) * | 2004-04-21 | 2005-10-26 | Nittan Co Ltd | Scattered-light smoke detector with reflecting element for noise suppression |
| JP2008224222A (en) * | 2007-03-08 | 2008-09-25 | Nohmi Bosai Ltd | Smoke detector |
| WO2013001966A1 (en) * | 2011-06-30 | 2013-01-03 | ホーチキ株式会社 | Scattered light-type smoke detection apparatus |
| WO2016035300A1 (en) * | 2014-09-04 | 2016-03-10 | パナソニックＩｐマネジメント株式会社 | Particle detection sensor |
| GB2531495A (en) * | 2014-06-16 | 2016-04-27 | Apollo Fire Detectors Ltd | Smoke detector |
-
1998
- 1998-08-25 JP JP10238133A patent/JP2000065741A/en not_active Withdrawn
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2413381B (en) * | 2004-04-21 | 2006-07-26 | Nittan Co Ltd | Smoke detector |
| US7248173B2 (en) | 2004-04-21 | 2007-07-24 | Nittan Company, Limited | Smoke detector |
| CN100426333C (en) * | 2004-04-21 | 2008-10-15 | 尼塔恩株式会社 | Smoke detector |
| DE102005018559B4 (en) * | 2004-04-21 | 2017-07-27 | Nittan Company Ltd. | smoke detector |
| GB2413381A (en) * | 2004-04-21 | 2005-10-26 | Nittan Co Ltd | Scattered-light smoke detector with reflecting element for noise suppression |
| KR101451983B1 (en) * | 2007-03-08 | 2014-10-21 | 노미 보사이 가부시키가이샤 | Smoke sensor |
| JP2008224222A (en) * | 2007-03-08 | 2008-09-25 | Nohmi Bosai Ltd | Smoke detector |
| JPWO2013001966A1 (en) * | 2011-06-30 | 2015-02-23 | ホーチキ株式会社 | Scattered light smoke detector |
| GB2505858A (en) * | 2011-06-30 | 2014-03-12 | Hochiki Co | Scattered light-type smoke detection apparatus |
| AU2012277058B2 (en) * | 2011-06-30 | 2015-08-13 | Hochiki Corporation | Scattered light-type smoke detection apparatus |
| US9157854B2 (en) | 2011-06-30 | 2015-10-13 | Hochiki Corporation | Scattered light-type smoke detection apparatus |
| GB2505858B (en) * | 2011-06-30 | 2017-03-01 | Hochiki Co | Scattered light-type smoke detection apparatus |
| WO2013001966A1 (en) * | 2011-06-30 | 2013-01-03 | ホーチキ株式会社 | Scattered light-type smoke detection apparatus |
| GB2531495A (en) * | 2014-06-16 | 2016-04-27 | Apollo Fire Detectors Ltd | Smoke detector |
| GB2531495B (en) * | 2014-06-16 | 2017-04-12 | Apollo Fire Detectors Ltd | Smoke detector |
| US10019879B2 (en) | 2014-06-16 | 2018-07-10 | Apollo Fire Detectors Limited | Conical light absorber for smoke detector |
| WO2016035300A1 (en) * | 2014-09-04 | 2016-03-10 | パナソニックＩｐマネジメント株式会社 | Particle detection sensor |
| JP2016053554A (en) * | 2014-09-04 | 2016-04-14 | パナソニックＩｐマネジメント株式会社 | Particle detection sensor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5834374B2 (en) | Photoelectric smoke detector | |
| JP2000235000A (en) | Light-scattering-type particle detection sensor | |
| JPH11248629A (en) | Light scattering type particle detecting sensor | |
| JP2008157718A (en) | Optical device and electronic apparatus | |
| JP3747830B2 (en) | Airborne particle detector | |
| JP2000065741A (en) | Photoelectric detector | |
| JP2008250852A (en) | Smoke detector | |
| JP2533687B2 (en) | Light scattering particle detection sensor | |
| JP2004333179A (en) | Reflective photosensor | |
| CN212009807U (en) | Smoke alarm capable of directionally eliminating interference of condensation | |
| JP2000065740A (en) | Photoelectric detector | |
| JPH11248628A (en) | Light scattering type particle detecting sensor | |
| JPH10213672A (en) | Heat ray type detector | |
| JPH10253533A (en) | Photo detector with film reflector | |
| JPH11213263A (en) | Light scattering type particle detecting sensor | |
| JP2581838B2 (en) | Light scattering particle detection sensor | |
| CN111540158A (en) | Smoke alarm with condensation recognition function and use method | |
| JP2002323434A (en) | Device for sensing floating fine particles | |
| JPS5926894B2 (en) | light scattering smoke detector | |
| JPH10241073A (en) | Photoelectric type smoke detector | |
| JP3747763B2 (en) | Photoelectric smoke detector | |
| JPS5941138B2 (en) | light scattering smoke detector | |
| JP2004063396A (en) | Regression reflecting photoelectric switch | |
| JPH04160696A (en) | Photoelectric smoke sensor | |
| JPH08136456A (en) | Photoelectric smoke detector |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20051101 |