JPH0577757U - Photoelectric dust sensor device - Google Patents
Photoelectric dust sensor deviceInfo
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- JPH0577757U JPH0577757U JP7015691U JP7015691U JPH0577757U JP H0577757 U JPH0577757 U JP H0577757U JP 7015691 U JP7015691 U JP 7015691U JP 7015691 U JP7015691 U JP 7015691U JP H0577757 U JPH0577757 U JP H0577757U
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- Prior art keywords
- light
- sensor device
- dust sensor
- detection
- photoelectric
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Abstract
(57)【要約】
【目的】迷光の発生を少なくし、高感度の光電式粉塵セ
ンサ装置を提供する。
【構成】発光器ＥＤから発する光が浮遊粉塵に当たって
拡散反射する散乱光を受光器ＬＤに集光して検知する光
電式粉塵センサ装置Ａにおいて、少なくとも発光器ＥＤ
の照射領域が受光器ＬＤの検知領域と交差する領域で、
前記送光器ＥＤの照射領域と受光器ＬＤの検知領域の光
軸の交差する面と平行な面と発光器ＥＤの照射領域との
間に死角空間４０を確保し、しかも粉塵を検出する検知
室１２を備えたものである。
(57) [Abstract] [Purpose] To provide a highly sensitive photoelectric dust sensor device in which generation of stray light is reduced. A photoelectric dust sensor device A for collecting and detecting scattered light diffused and reflected by light emitted from a light emitting device ED upon floating dust in a light receiving device LD, at least the light emitting device ED.
In the area where the irradiation area of the crosses the detection area of the light receiver LD,
Detection that secures a blind spot space 40 between a plane parallel to the intersecting optical axis of the irradiation area of the light transmitter ED and the detection area of the light receiver LD and the irradiation area of the light emitter ED, and that detects dust A room 12 is provided.
Description
【０００１】[0001]
本考案は、店舗、事務所等の非住宅及び一般家庭において使用される空気清浄 器に搭載したり、室内に単独で設置したりして、空気の汚れを検出し、空気清浄 器、換気扇等の自動運転を行ったりする光電式粉塵センサ装置に関する。 The present invention can be installed in an air purifier used in non-residential homes such as stores and offices or in general households, or can be installed independently in a room to detect air pollution and detect air purifiers, ventilation fans, etc. The present invention relates to a photoelectric dust sensor device that automatically operates.
【０００２】[0002]
従来の空気清浄器の、室内の空気の汚れを検出して吸気ファンの回転、停止の 自動運転制御、又は換気扇の換気運転を行う空気汚れセンサとして、タバコの喫 煙に含まれる水素等を酸化スズ等の抵抗率変化で検出するガス式センサを用いて いる為、電源を投入してからセンサが安定状態となり機能を開始するまで約５分 程度の時間を要し、又煙が除去された段階においても、センサ素子の抵抗値は元 の状態に復帰するのに十分な時間を必要とする為、タイマ制御出力を内蔵する必 要があった。又タイマの条件は部屋の広さなど、一定の使用条件を前提とした粉 塵濃度の変化に基づく予測を加味した内容で行なったものが大半で、タバコの煙 に代表される浮遊粉塵濃度の変化に見合った運転制御とかけ離れており、空気清 浄器の使用実感（人の感じる清浄感）に合わないといった欠点を有していた。 Oxidation of hydrogen, etc. contained in cigarette smoke as an air pollution sensor for conventional air purifiers that detects dirt in the room air and performs automatic operation control of rotation and stop of the intake fan or ventilation operation of the ventilation fan. Since a gas type sensor that detects changes in the resistivity of tin etc. is used, it takes about 5 minutes from the time the power is turned on until the sensor becomes stable and starts to function, and the smoke is removed. Even in the step, the resistance value of the sensor element needs a sufficient time to return to the original state, so it was necessary to incorporate the timer control output. Most of the conditions of the timer were made in consideration of the prediction based on changes in dust concentration assuming certain usage conditions such as the size of the room. It is far from the operation control that matches the changes, and has the drawback that it does not match the actual feeling of using the air cleaner (the feeling of cleanliness felt by humans).
【０００３】[0003]
室内の空気の汚れを検出する手段として、ガス検知方式と同等レベルの濃度の 浮遊粉塵の検出性能を光電式粉塵センサ装置にて実現する為、光電式で浮遊粉塵 の検出性能を左右する検知室の迷光量を著しく低減する必要がある。光電式粉塵 センサ装置は発光器から発する光が浮遊粉塵に当たって拡散反射する散乱光を、 受光器に集光して検知するが、粉塵の無い状態においても、発光器から発した光 が検知室の内部の壁面に当たって反射し、受光器に入る光を一般的に迷光と呼ん でおり、迷光をいかに小さくするかが、設計の大きな課題とされている。即ち迷 光が大きいことは、センサ内部で、粉塵の検知とは無関係の光が絶えず受光器に 入射しているわけで、内部の壁面が汚れたり埃などの付着の影響を受けやすいこ とになる。 本考案は、上記事情に鑑みてなされたものであり、迷光の発生を少なくする光 電式粉塵センサ装置を提供することを目的としている。 As a means for detecting indoor air contamination, the photoelectric dust sensor device achieves the detection performance of floating dust with the same level of concentration as the gas detection method.Therefore, the detection chamber that influences the detection performance of floating dust by the photoelectric method It is necessary to significantly reduce the amount of stray light. The photoelectric dust sensor device collects scattered light, which is emitted from the light emitter and diffused and reflected by floating dust, on the light receiver to detect the scattered light.However, even when there is no dust, the light emitted from the light emitter emits light in the detection chamber. The light that hits the internal wall and reflects and enters the light receiver is generally called stray light, and how to reduce stray light is a major design issue. In other words, the large amount of stray light means that light unrelated to the detection of dust is constantly incident on the light receiver inside the sensor, and the inner wall surface is easily affected by dirt and dust. Become. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a photoelectric dust sensor device that reduces the generation of stray light.
【０００４】[0004]
上記目的を達成するために提案する請求項１の本考案は、発光器から発する光 が浮遊粉塵に当たって拡散反射する散乱光を受光器に集光して検知する光電式粉 塵センサ装置において、少なくとも発光器の照射領域が受光器の検知領域と交差 する領域で、前記発光器の照射領域と受光器の検知領域の光軸の交差する面と平 行な面と、発光器の照射領域との間に死角空間を確保し、しかも粉塵を検出する 検知室を備えたものである。 請求項２の本考案は、発光器の照射領域の光軸と受光器の検知領域の光軸の交 差する位置に光軸の交差する面に直交する空気の流通路を構成し、流通路開口部 の周縁に堀込み空間を設けたことを特徴したものである。 In order to achieve the above object, the present invention according to claim 1 proposes at least a photoelectric dust sensor device for collecting and detecting scattered light, which is diffused and reflected when light emitted from a light emitter hits suspended dust, in a light receiver. An area where the irradiation area of the light emitter intersects the detection area of the light receiver, and a surface that is parallel to the surface that intersects the optical axes of the irradiation area of the light emitter and the detection area of the light receiver and the irradiation area of the light emitter. A blind spot space is secured between them, and a detection chamber for detecting dust is provided. According to the second aspect of the present invention, an air flow passage is formed at a position where the optical axis of the irradiation region of the light emitter intersects with the optical axis of the detection region of the light receiver, the air flow passage being orthogonal to the plane where the optical axes intersect. The feature is that a digging space is provided at the periphery of the opening.
【０００５】[0005]
請求項１の本考案では、検知室内部にて迷光の発生を少なくする構成として発 光器として指向性をより鋭利に設定し、又、受光器もレンズを使用して集光し広 範囲且つ鋭利な検知領域を構成する。よって、高感度に検知される。更に、サン プリングされる空気は前述の発光器及び受光器の光軸にて形成される面に垂直に 流路を形成するものであり、検知室を構成する側壁の条件として、前記発光器の 照射領域と受光器の検知領域の光軸の交差する面と平行な面、即ち空気の流通路 を形成する両開口部の側壁と発光器の照射領域との間に死角空間を設けているの で、発光器からの光が側壁面に当たり、拡散反射して受光器にはいることはない 。 請求項２の本考案では、空気の流通路を形成する両開口部の周縁に堀込み空間 を設けたことにより、光電式粉塵センサ装置の厚さを薄くした条件にて、限定さ れたスペースで検知室が広くなり、発光器から直接拡散反射した光エネルギが受 光器に到達せず、迷光を少なくすることが可能となる。 According to the first aspect of the present invention, the directivity is set to be sharper as the light emitter so as to reduce the generation of stray light in the detection chamber, and the light receiver also uses a lens to collect light over a wide range. Configure a sharp sensing area. Therefore, it is detected with high sensitivity. Further, the air to be sampled forms a flow path perpendicular to the plane formed by the optical axes of the above-mentioned light emitter and light receiver, and the condition of the side wall forming the detection chamber is that A blind spot space is provided between the irradiation area and the detection area of the light receiver in a plane parallel to the intersecting surface of the optical axes, that is, between the side walls of both openings forming the air flow passage and the irradiation area of the light emitter. Therefore, the light from the light emitter hits the side wall surface and is not diffusely reflected to enter the light receiver. According to the present invention of claim 2, a limited space is provided under the condition that the thickness of the photoelectric dust sensor device is made thin by providing a dug space at the periphery of both openings forming the air flow passage. The detection chamber becomes wider, and the light energy directly diffused and reflected from the light emitter does not reach the light receiver, and it is possible to reduce stray light.
【０００６】[0006]
以下に、請求項１、２の本考案の実施例を図面に基づいて記述する。図１に本 考案に用いる光電式粉塵センサ装置の裏面カバーをあけた状態図を示す。図２（ ａ）（ｂ）（ｃ）に構成図を示す。図３に本考案に用いる光電式粉塵センサ装置 の分解斜視図を示す。 本考案は空気の汚れを検出するセンサとして、ビル管理法に定める浮遊粉塵濃 3 度レベル（＝０．１５ｍｇ／ｍ）の検出を想定して説明を進める。 図１に示すように、発光ダイオ−ドよりなる発光素子ＥＤ（発光器）およびホト ダイオ−ドよりなる受光素子ＬＤ（受光器）が直方体状ケ−ス１の中に配設され る。このケ−ス１は、合成樹脂よりなる互いに対向する２面が開口した矩形枠状 のボディ１０と、ボディ１０の両開口面をそれぞれ覆う金属製の第１のカバ−２ ０及び合成樹脂製の第２のカバ−３０により構成される。ボディ１０には壁面１ １によって囲まれた検知室１２が形成されている（図２参照）。第１のカバ−２ ０及び第２のカバ−３０にはそれぞれ流通口２１、３１が形成され両流通口２１ 、３１は開口面に直交する方向の一直線上に位置する。以上のような構造によっ て、両流通口２１、３１の間に検知室１２を通る流路を形成することができ、発 光素子ＥＤの照射領域と受光素子ＬＤの受光領域との重複部分である検知空間の 中での浮遊微粒子を検知することができるのである。 一方検知室１２には、図１に示すように、発光素子ＤＥと受光素子ＬＤの間で 隔壁１８が形成され、流通窓１４（図３参照）に対応する部位では隔壁１８に切 欠１９が形成されている。この隔壁１８により、発光素子ＥＤからの直接光が受 光素子ＬＤに入射するのが防止されている。発光素子ＥＤ及び受光素子ＬＤは、 検知室１２の中で、図１の上部に配置されており、検知室１２の側壁は図１の下 部から上部に向かって次第に距離を小さくするように傾斜している。Embodiments of the present invention according to claims 1 and 2 will be described below with reference to the drawings. FIG. 1 shows a state diagram in which the back cover of the photoelectric dust sensor device used in the present invention is opened. 2A, 2B, and 2C are block diagrams. FIG. 3 shows an exploded perspective view of the photoelectric dust sensor device used in the present invention. The present invention will be described as a sensor for detecting dirt on the air on the assumption of detection of airborne dust concentration level of 3 degrees (= 0.15 mg / m) defined by the Building Management Law. As shown in FIG. 1, a light emitting element ED (light emitting device) made of a light emitting diode and a light receiving element LD (light receiving device) made of a photo diode are arranged in a rectangular parallelepiped case 1. The case 1 is made of a synthetic resin and has a rectangular frame-shaped body 10 having two opposite faces opened, a first metal cover 20 and a synthetic resin 20 which cover both open faces of the body 10. The second cover 30 is used. A detection chamber 12 surrounded by a wall surface 11 is formed in the body 10 (see FIG. 2). The first cover 20 and the second cover 30 are provided with flow ports 21 and 31, respectively, and both flow ports 21 and 31 are located on a straight line in a direction orthogonal to the opening surface. With the structure as described above, a flow path that passes through the detection chamber 12 can be formed between the both flow ports 21 and 31, and the overlapping portion of the irradiation area of the light emitting element ED and the light receiving area of the light receiving element LD. It is possible to detect suspended particles in the detection space. On the other hand, in the detection chamber 12, as shown in FIG. 1, a partition 18 is formed between the light emitting element DE and the light receiving element LD, and a notch 19 is formed in the partition 18 at a portion corresponding to the flow window 14 (see FIG. 3). Has been formed. The partition wall 18 prevents direct light from the light emitting element ED from entering the light receiving element LD. The light emitting element ED and the light receiving element LD are arranged in the upper part of FIG. 1 in the detection chamber 12, and the side wall of the detection chamber 12 is inclined so that the distance gradually decreases from the lower part of FIG. 1 toward the upper part. is doing.
【０００７】 検知室１２を構成する側面において、前記発光素子ＥＤの照射領域の光軸と受 光素子ＬＤの検知領域の光軸の交差する面に直交する所に空気の流通路を構成す る。発光素子ＥＤの照射領域と受光器の検知領域の光軸の交差する面と平行な面 、即ち空気の流通路を形成する両開口部の側壁において発光素子ＥＤの照射領域 と開口部を構成する側壁面４１に図４に示すように死角空間４０を確保するもの とする。この死角空間４０を確保することによって、発光素子ＥＤからの光が側 壁面４１に当たり、拡散反射して受光器ＬＤにはいることはない。On the side surface forming the detection chamber 12, an air flow path is formed at a position orthogonal to a surface where the optical axis of the irradiation area of the light emitting element ED and the optical axis of the detection area of the light receiving element LD intersect. .. The irradiation area and the opening of the light emitting element ED are formed on the surface parallel to the intersecting optical axis of the irradiation area of the light emitting element ED and the detection area of the light receiver, that is, on the sidewalls of both openings forming the air passage. A blind spot space 40 is secured on the side wall surface 41 as shown in FIG. By ensuring this blind spot space 40, the light from the light emitting element ED does not hit the side wall surface 41, diffusely reflect, and enter the light receiver LD.
【０００８】 又、流通路開口部の周縁に検知室１２の内寸が大きくなる様、開口部を形成す るケ−ス１の検知室側及び、合成樹脂製カバ−の検知室側に堀込み空間５０、５ ０を設ける（請求項２）。図５は堀込み空間５０を示す一部断面図である。この 堀込み空間５０、５０を設けることによって、光電式粉塵センサ装置Ａの厚さを 薄くした条件にて、限定したスペース空間が広くなり、迷光を少なくすることが 可能となる。Further, in order to increase the inner size of the detection chamber 12 at the peripheral edge of the flow passage opening, the detection chamber side of the case 1 forming the opening and the detection chamber side of the synthetic resin cover are dug. A space 50, 50 is provided (claim 2). FIG. 5 is a partial cross-sectional view showing the dug space 50. By providing the digging spaces 50, 50, the limited space space is widened and the stray light can be reduced under the condition that the photoelectric dust sensor device A is thin.
【０００９】 ところで、発光素子ＥＤは、図６に示すように発振回路５１及び駆動回路５２ により、ほぼ一定周期で間欠的に点灯されるように駆動される。 一方、受光素子ＬＤの受光量に対応した電流出力の受光信号は、演算増幅回路 を用いて構成された入力イン−ダンスの非常に高く、帰還抵抗の非常に高い（１ ００ＭΩ程度）電流−電圧変換回路６１を通して受光量に対応する電圧出力に変 換される。その後、電圧出力に変換された、受光信号は、帯域フィルタ６２を通 り、さらに、ピ−クカット回路６３によりクリッピングされノイズ成分が除去さ れる。 このようにして、受光信号からノイズ成分を除去した後に、受光信号をサンプ ルホ−ルド回路６４に入力し、発振回路５１の出力に基づいて発光素子ＥＤの点 灯タイミングに同期するように受光信号を取り込む、次の受光信号が入力される までの間、受光信号の電圧値を保持する。そして、サンプルホ−ルド回路６４の 出力と、基準電圧発生回路６６より出力された基準電圧との差分を取って補正を 行う差動増幅回路６７を備え、差動増幅回路６７の出力を直流増幅回路６８によ り増幅することにより、受光信号に対応した連続出力が得られるように構成して ある。 基準電圧発生回路６６は、電源電圧を分圧する第１基準電圧発生回路６６ａと 、第１基準電圧発生回路６６ａより出力された第１の基準電圧に基づいて第２の 基準電圧を出力する第２基準電圧発生回路６６ｂとからなる。差動増幅回路６７ には第２の基準電圧が入力され、又、直流増幅回路６８には第１の基準電圧が入 力される。上記各回路へは、直流電圧を定電圧化する電源回路５５により給電さ れる。By the way, the light emitting element ED is driven by the oscillation circuit 51 and the drive circuit 52 so as to be intermittently lit at a substantially constant period as shown in FIG. On the other hand, the received light signal of the current output corresponding to the amount of received light of the light receiving element LD has a very high input impedance and a very high feedback resistance (about 100 MΩ) formed by using the operational amplifier circuit. It is converted into a voltage output corresponding to the amount of received light through the conversion circuit 61. Thereafter, the received light signal converted into the voltage output passes through the bandpass filter 62, and is further clipped by the peak cut circuit 63 to remove the noise component. In this way, after the noise component is removed from the received light signal, the received light signal is input to the sample hold circuit 64, and based on the output of the oscillation circuit 51, the received light signal is synchronized with the lighting timing of the light emitting element ED. Holds the voltage value of the received light signal until the next received light signal is input. A differential amplifier circuit 67 is provided which corrects by taking the difference between the output of the sample hold circuit 64 and the reference voltage output from the reference voltage generation circuit 66. The output of the differential amplifier circuit 67 is DC amplified. Amplification is performed by the circuit 68 so that a continuous output corresponding to the received light signal can be obtained. The reference voltage generation circuit 66 includes a first reference voltage generation circuit 66a that divides the power supply voltage, and a second reference voltage that outputs a second reference voltage based on the first reference voltage output from the first reference voltage generation circuit 66a. The reference voltage generating circuit 66b. The second reference voltage is input to the differential amplifier circuit 67, and the first reference voltage is input to the DC amplifier circuit 68. Power is supplied to each of the above circuits by a power supply circuit 55 that converts the DC voltage into a constant voltage.
【００１０】 図７は本考案による空気清浄器の全体斜視分解図である。光電式粉塵センサ装 置Ａは、空気の吸い込み口１４の反対側より空気清浄器本体Ｂのファン７２の吸 気気流の一部をバイパス通路７７にてバイパスする。この空気清浄器Ｂは、きょ う体７１の中にファン７２を備え、きょう体７１の前面から導入した空気をきょ う体７１の上面に設けた吹き出し口７６から送出するように構成されている。き ょう体７１の前面には前面カバ−７３が着脱自在に装着され、きょう体７１と前 面カバ−７３との間には、フィルタホルダ７４に保持された一対のフィルタ７５ ａ、７５ｂが配設される。フィルタ７５ａは大きな塵が中に入るのを防止する為 に設けられ、フィルタ７５ｂは浮遊微粒子や匂いの一部を除去する為に設けられ ている。FIG. 7 is an exploded perspective view of the entire air purifier according to the present invention. The photoelectric dust sensor device A bypasses a part of the intake airflow of the fan 72 of the air purifier main body B from the side opposite to the air intake port 14 in the bypass passage 77. This air purifier B is provided with a fan 72 inside a casing 71, and is configured to blow out the air introduced from the front of the casing 71 through an outlet 76 provided on the upper surface of the casing 71. ing. A front cover 73 is detachably attached to the front surface of the casing 71, and a pair of filters 75a and 75b held by a filter holder 74 is provided between the casing 71 and the front cover 73. It is arranged. The filter 75a is provided to prevent a large amount of dust from entering inside, and the filter 75b is provided to remove a part of suspended particulates and odor.
【００１１】[0011]
以上説明したように請求項１の本考案の構成によれば、検知室を構成する側壁 設置条件として、少なくとも発光器の照射領域が受光器の検知領域と交差する領 域において、前記発光器の照射領域と受光器の検知領域の光軸の交差する面と平 行な面、即ち空気の流通路を形成する両開口部の側壁と、発光器の照射領域と開 口部を構成する側壁面に死角空間を確保しているので、発光器からの光が側壁面 に当たり、拡散反射して受光器にはいることはなく、従って、所謂迷光を著しく 減少することが可能となるのである。 又、請求項２の本考案では、前記発光器の照射領域と受光器の検知領域の光軸 の交差する面と、平行な面、即ち空気の流通路を形成する両開口部の周縁に堀込 み空間を設け、限られたスペースで空間を設ける構成となり、光電式粉塵センサ 装置の厚さを薄くした条件にて、迷光を少なくすることが可能となり、粉塵セン サ装置を例えば空気清浄器に設置しようとした場合、取り付け面からのセンサの 突出が軽減でき、デザイン的に優れたものを提供することが可能となる。 以上のように、粉塵の無い状態での発光素子ＥＤから、検知室内部壁面を介し て受光素子ＬＤに到達する迷光は殆ど無くすることが可能となり、結果として、 増幅回路の増幅率を大きくとることが可能となり、微小な浮遊粉塵微粒子を高感 度に検出することができるという効果を奏するのである。 As described above, according to the configuration of the present invention of claim 1, as a condition for installing the side wall forming the detection chamber, at least in the area where the irradiation area of the light emitter intersects the detection area of the light receiver, The irradiation area and the detection area of the photodetector are parallel to the plane intersecting the optical axes, that is, the side walls of both openings that form the air flow passage, and the side walls that form the irradiation area and the opening of the light emitter. Since the blind spot space is secured in the above, the light from the light emitter does not hit the side wall surface and diffusely reflects and does not enter the light receiver. Therefore, so-called stray light can be significantly reduced. Further, according to the present invention of claim 2, a surface parallel to the surface where the optical axes of the irradiation area of the light emitter and the detection area of the light receiver intersect, that is, the periphery of both openings forming the air flow passage is dug. It is possible to reduce stray light under the condition that the photoelectric dust sensor device is thin, and to use the dust sensor device as an air purifier, for example. If you try to install it, the protrusion of the sensor from the mounting surface can be reduced, and it is possible to provide an excellent design. As described above, it is possible to almost eliminate stray light that reaches the light receiving element LD from the light emitting element ED in the dust-free state through the wall surface inside the detection chamber, and as a result, the amplification factor of the amplifier circuit is increased. This makes it possible to detect minute airborne dust particles with high sensitivity.
【図１】本考案の一実施例の光電式粉塵センサ装置の裏
面カバーをあけた状態図である。FIG. 1 is a state view of a photoelectric dust sensor device according to an embodiment of the present invention with a back cover opened.
【図２】（ａ）〜（ｃ）は本考案の一実施例の光電式粉
塵センサ装置の構成図である。2A to 2C are configuration diagrams of a photoelectric dust sensor device according to an embodiment of the present invention.
【図３】本考案の一実施例の光電式粉塵センサ装置の分
解斜視図である。FIG. 3 is an exploded perspective view of a photoelectric dust sensor device according to an embodiment of the present invention.
【図４】本考案の光電式粉塵センサ装置の上下死角空間
を示す一部断面図である。FIG. 4 is a partial cross-sectional view showing a vertical blind spot space of the photoelectric dust sensor device of the present invention.
【図５】本考案の光電式粉塵センサ装置の堀込み空間を
示す一部断面図である。FIG. 5 is a partial cross-sectional view showing a dug space of the photoelectric dust sensor device of the present invention.
【図６】本考案の一実施例の回路のブロック図である。FIG. 6 is a block diagram of a circuit according to an embodiment of the present invention.
【図７】本考案による光電式粉塵センサ装置を空気清浄
器に組み込んだ状態の斜視分解図である。FIG. 7 is a perspective exploded view of the photoelectric dust sensor device according to the present invention installed in an air purifier.
Ａ・・・光電式粉塵センサ装置 １・・・直方体状ケース １０・・・矩形枠状のボディ １２・・・検知室 ２０・・・第１のカバー ３０・・・第２のカバー ２１、３１・・・流通口 ４０・・・死角空間 ５０・・・堀込み空間 ＥＤ・・・発光素子（発光器） ＬＤ・・・受光素子（受光器） A ... Photoelectric dust sensor device 1 ... Rectangular case 10 ... Rectangular frame body 12 ... Detection chamber 20 ... First cover 30 ... Second cover 21, 31・ ・ ・ Flow port 40 ・ ・ ・ Blind spot space 50 ・ ・ ・ Drilling space ED ・ ・ ・ Light emitting element (light emitting device) LD ・ ・ ・ Light receiving element (light receiving device)
Claims (2)
て拡散反射する散乱光を受光器に集光して検知する光電
式粉塵センサ装置において、少なくとも前記発光器の照
射領域が前記受光器の検知領域と交差する領域で、前記
発光器の照射領域と前記受光器の検知領域の光軸の交差
する面と平行な面と前記発光器の照射領域との間に死角
空間を確保し、しかも粉塵を検出する検知室を備えたこ
とを特徴とする光電式粉塵センサ装置。1. In a photoelectric dust sensor device for detecting scattered light diffused and reflected by light emitted from a light emitter on floating dust, the photoelectric dust sensor device detects at least an irradiation area of the light emitter and a detection area of the light receiver. In a region intersecting with the irradiation region of the light emitter and a detection region of the light receiver, a blind spot space is secured between the surface parallel to the surface intersecting the optical axis and the irradiation region of the light emitter, and dust is collected. A photoelectric dust sensor device comprising a detection chamber for detecting.
器の検知領域の光軸の交差する位置に光軸の交差する面
に直交する空気の流通路を構成し、流通路開口部の周縁
に堀込み空間を設けたことを特徴とする請求項１に記載
の光電式粉塵センサ装置。2. A flow passage opening is formed at a position where an optical axis of an irradiation region of the light emitter intersects with an optical axis of a detection region of the light receiver, the air flow passage being orthogonal to a surface where the optical axes intersect. The photoelectric dust sensor device according to claim 1, wherein a digging space is provided at a peripheral edge of the photoelectric dust sensor device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7015691U JPH0577757U (en) | 1991-08-06 | 1991-08-06 | Photoelectric dust sensor device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7015691U JPH0577757U (en) | 1991-08-06 | 1991-08-06 | Photoelectric dust sensor device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0577757U true JPH0577757U (en) | 1993-10-22 |
Family
ID=13423430
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7015691U Withdrawn JPH0577757U (en) | 1991-08-06 | 1991-08-06 | Photoelectric dust sensor device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0577757U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007047029A (en) * | 2005-08-10 | 2007-02-22 | Sharp Corp | Dust sensor and air cleaner |
| WO2013035403A1 (en) * | 2011-09-09 | 2013-03-14 | シャープ株式会社 | Particle detector |
| JP2016090350A (en) * | 2014-10-31 | 2016-05-23 | パナソニックＩｐマネジメント株式会社 | Particle detection sensor, dust sensor, smoke detector, air purifier, ventilator, and air conditioner |
| CN107036949A (en) * | 2017-05-19 | 2017-08-11 | 武汉四方光电科技有限公司 | Dust concentration detection means and provided with dust concentration detection means air cleaning facility |
-
1991
- 1991-08-06 JP JP7015691U patent/JPH0577757U/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007047029A (en) * | 2005-08-10 | 2007-02-22 | Sharp Corp | Dust sensor and air cleaner |
| WO2013035403A1 (en) * | 2011-09-09 | 2013-03-14 | シャープ株式会社 | Particle detector |
| JP2013068595A (en) * | 2011-09-09 | 2013-04-18 | Sharp Corp | Particle detector |
| JP2016090350A (en) * | 2014-10-31 | 2016-05-23 | パナソニックＩｐマネジメント株式会社 | Particle detection sensor, dust sensor, smoke detector, air purifier, ventilator, and air conditioner |
| CN107036949A (en) * | 2017-05-19 | 2017-08-11 | 武汉四方光电科技有限公司 | Dust concentration detection means and provided with dust concentration detection means air cleaning facility |
| CN107036949B (en) * | 2017-05-19 | 2024-04-26 | 四方光电股份有限公司 | Dust concentration detection device and air purification equipment with same |
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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: 19951102 |