JPH0581774U - Optical object detector - Google Patents
Optical object detectorInfo
- Publication number
- JPH0581774U JPH0581774U JP3077492U JP3077492U JPH0581774U JP H0581774 U JPH0581774 U JP H0581774U JP 3077492 U JP3077492 U JP 3077492U JP 3077492 U JP3077492 U JP 3077492U JP H0581774 U JPH0581774 U JP H0581774U
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- light
- light emission
- interference signal
- interval
- signal
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Abstract
(57)【要約】
【目的】 複数のこれら物体検知装置を設けた時に発生
する相手側の光による相互干渉を防止する。
【構成】 発光部の発光間隔を表わす信号と、予め設定
された発光間隔を表わす信号とを比較し異なる場合には
干渉信号が存在すると判定する干渉信号認知回路３と、
この干渉信号認知回路３からの出力信号により発光間隔
を新たに設定する発光タイミング設定回路５とを有し、
他の光学式物体検知装置からの発光を受光した場合には
予め設定された自己の発光間隔とは異なる時間で受光す
るので、干渉信号認知回路３では干渉信号が存在すると
して、それを表わす信号を発光タイミング設定回路５に
送り、発光間隔を新たに設定し、設定された間隔内に干
渉信号があるかを見て、無くなるまで間隔設定を繰り返
す。
(57) [Abstract] [Purpose] To prevent mutual interference caused by light from the other party when a plurality of these object detection devices are provided. An interference signal recognizing circuit 3 that compares a signal representing a light emitting interval of a light emitting unit with a signal representing a preset light emitting interval and determines that an interference signal exists if different.
A light emission timing setting circuit 5 for newly setting a light emission interval according to an output signal from the interference signal recognition circuit 3;
When the light emitted from another optical object detection device is received, the light is received at a time different from the preset light emission interval of itself, and therefore, the interference signal recognition circuit 3 determines that an interference signal exists and a signal indicating the interference signal. Is sent to the light emission timing setting circuit 5, a light emission interval is newly set, it is checked whether there is an interference signal within the set interval, and the interval setting is repeated until there is no interference signal.
Description
【０００１】[0001]
この考案は、被検知物体に光を照射し、その反射光を受光することにより所定 のエリアにおける被検知物体の有無を検知する光学式物体検知装置に関し、特に 詳しく言うと、複数のこれら物体検知装置を設けた時に発生する相手側の光によ る相互干渉を防止するようにした光学式物体検知装置に関する。 The present invention relates to an optical object detection device that detects the presence or absence of a detected object in a predetermined area by irradiating the detected object with light and receiving the reflected light. The present invention relates to an optical object detection device which prevents mutual interference caused by light from the other side when the device is provided.
【０００２】[0002]
発光部から赤外線のような光ビームを検知エリアに発光し、この検知エリアか ら反射してきた光ビームを受光部で受光し、受光レベルの変化で検知エリアに人 や物体の存在を検知する光学式物体検知装置は、例えば自動ドアの開閉制御等に 広く利用されている。すなわち、検知エリアに人や物体が位置した時には、発光 部からの光ビームはこれら人や物体に反射して受光部に送られるので、検知エリ アから反射してきた場合に比べて受光量が増加し、この増加分を検出することで 検知エリアにおける物体の有無が検知できる。このような光学式物体検知装置の 発光部と受光部は、前面にフレンネルレンズを配した容器内に一体的に組み込ま れ、フレンネルレンズにより光を広い範囲に照射しかつその範囲からの反射光を 受光するようにユニット化されている。 An optical system that emits a light beam such as infrared rays from the light emitting unit to the detection area, receives the light beam reflected from this detection area at the light receiving unit, and detects the presence of a person or object in the detection area based on the change in the light receiving level. The object detection device is widely used, for example, for automatic door opening / closing control. That is, when a person or an object is located in the detection area, the light beam from the light emitting section is reflected by these persons or objects and sent to the light receiving section, so the amount of light received increases compared to when it is reflected from the detection area. However, the presence or absence of an object in the detection area can be detected by detecting this increase. The light emitting part and the light receiving part of such an optical object detection device are integrated into a container with a Fresnel lens on the front surface, and the Fresnel lens irradiates light to a wide range and reflects it. It is unitized to receive light.
【０００３】 一方、自動ドアは間口が９０ｃｍ（半間）幅の狭い入口を塞ぐものから、１８ ０ｃｍ（１間）幅以上の広い入口を塞ぐ引分ドア式のものまで種々提供されてい る。また、２組の自動ドアを所定の間隔を置いて配置し、その間に風除室を作り 、一方の自動ドアが開いても他方のドアは所定の近さまで近づかない限り開かな いように制御して、室内に外気が極力直接的に入らないようにした二重ドア式の ものも提供されている。したがって、狭いドアの場合はその検知エリアも狭くて よく、１組の発光部と受光部とでカバーできるが、広いドアの場合はその検知エ リアも広くなり複数組の発光部と受光部を配置して検知エリアを広くする必要が ある。On the other hand, various automatic doors are available, from those having a narrow entrance with a narrow width of 90 cm (half a width) to those of a pull door type with a wide entrance having a width of 180 cm (a gap) or more. In addition, two sets of automatic doors are arranged at a predetermined interval, a windbreak chamber is created between them, and control is performed so that even if one automatic door opens, the other door does not open unless it comes close to a predetermined proximity. A double-door type is also provided, which prevents outside air from entering the room as directly as possible. Therefore, in the case of a narrow door, its detection area may be small, and it can be covered with one set of light emitting part and light receiving part. It is necessary to arrange them to widen the detection area.
【０００４】 このように、複数の発光部と受光部を配置した場合、１つの発光部から照射さ れ、検知エリアや被検知物に反射した反射光をこの発光部に対応する受光部で受 光する前に、他の発光部からの光や反射光も受光部が受光する可能性があり、受 光量の増加で、検知エリアに人や物体があると判断し、ドアが開きいわゆる自然 開放してしまう。このような相互干渉を防止するため、従来は発光部毎に光の周 波数を異ならせて、受光部が異なる受光部で受光しても干渉が起こらないように している。In this way, when a plurality of light emitting units and light receiving units are arranged, the light received from one light emitting unit and reflected by the detection area or the object to be detected is received by the light receiving unit corresponding to this light emitting unit. Before the light shines, the light receiving part may receive light from other light emitting parts or reflected light, and it is judged that there is a person or object in the detection area due to the increase in the amount of light received, and the door opens so-called natural opening. Resulting in. In order to prevent such mutual interference, conventionally, the frequency of light is made different for each light emitting unit so that interference does not occur even if light is received by different light receiving units.
【０００５】[0005]
発光部の周波数を変えるためには、各発光部に周波数設定回路と外部からそれ を操作するスイッチ等を設けなければならず、またマイクロコンピュータで制御 している場合には、ディップスイッチ等が必要になり、構造が複雑になってしま う。更に、これらスイッチの調整は作業員が人為的に行なうためバラ付きが生じ 、保守点検時には再調整を行なう必要性が生じる等、保守点検も煩雑になってし まう欠点がある。 In order to change the frequency of the light emitting parts, each light emitting part must be provided with a frequency setting circuit and a switch for operating it from the outside, and if it is controlled by a microcomputer, a dip switch etc. is required. And the structure becomes complicated. Further, since the workers manually adjust these switches, variations occur, and it becomes necessary to readjust them at the time of maintenance and inspection, which makes maintenance and inspection complicated.
【０００６】 そこでこの考案の目的は、異なる発光部からの光信号を検知して干渉しない発 光タイミングを自動的に設定するようにして相互干渉を防止するようにした光学 式物体検知装置を提供することである。Therefore, an object of the present invention is to provide an optical object detection device that detects optical signals from different light emitting parts and automatically sets a light emission timing that does not interfere with each other to prevent mutual interference. It is to be.
【０００７】[0007]
この考案は、被検知物体に発光部から光を照射し、その反射光を受光部で受光 することにより所定のエリアにおける被検知物体の有無を検知する光学式物体検 知装置において、受光部で受光した信号により発光間隔を測定し、予め設定され た自己の発光間隔を表わす信号とを比較し異なる場合には干渉信号が存在すると 判定する干渉信号認知回路と、この干渉信号認知回路からの出力信号により発光 間隔を新たに設定する発光タイミング設定回路とを有することを特徴とするもの である。 This invention is an optical object detection device that detects the presence or absence of a detected object in a predetermined area by irradiating the detected object with light from a light emitting section and receiving the reflected light at the light receiving section. An interference signal recognition circuit that measures the light emission interval from the received signal, compares it with a preset signal representing the light emission interval, and if there is a difference, determines that an interference signal exists, and the output from this interference signal recognition circuit. And a light emission timing setting circuit for newly setting a light emission interval according to a signal.
【０００８】[0008]
以上のように構成することにより、他の光学式物体検知装置からの信号を受光 した場合には予め設定された自己の発光間隔とは異なる時間で受光することにな り、干渉信号認知回路では干渉信号が存在するとして、それを表わす信号を発光 タイミング設定回路に送り、発光間隔を新たに設定する。この新たに設定された 発光間隔で発光部を発光させ、再びその間隔内に干渉信号があるかを見て、ある 場合には更に異なる発光タイミングの間隔を設定するようにしていく。干渉信号 の存在が認められなくなった時は、この発光タイミングの調整を一時的に停止す る。 With the above configuration, when a signal from another optical object detection device is received, it will be received at a time different from the preset light emission interval of its own, and the interference signal recognition circuit will If there is an interference signal, a signal representing it is sent to the light emission timing setting circuit to newly set the light emission interval. The light emitting section is caused to emit light at the newly set light emitting interval, and it is checked again whether there is an interference signal within that interval, and if there is, a different light emitting timing interval is set. When the presence of the interference signal is no longer recognized, the adjustment of the light emission timing is temporarily stopped.
【０００９】[0009]
以下、この考案を図面に示す一実施例について説明する。なお、発光素子およ び受光素子は従来の光学式物体検知装置に用いられているものを使用できるので 、その詳細な説明および図示は省略する。 An embodiment of the present invention shown in the drawings will be described below. Since the light emitting element and the light receiving element can be the same as those used in the conventional optical object detection device, detailed description and illustration thereof will be omitted.
【００１０】 この実施例における光学式物体検知装置は、受光素子からの受光信号を増幅す る信号増幅器１と、信号増幅器１の出力信号を所定のサンプル信号にしたがって Ａ／Ｄして発光間隔を表わす信号として出力するＡ／Ｄ変換器２と、Ａ／Ｄ変換 器２からの相手の出力信号と自己の予め設定された発光タイミング信号とを比較 し、異なる場合には干渉信号が存在すると判定する干渉信号認知回路３と、干渉 測定の時間間隔を設定するとともに、相手方の発光タイミングを測定している間 は自己の発光を停止するように停止信号を出力する干渉測定間隔制御回路４と、 干渉信号認知回路３からの出力信号により異なった発光タイミングを設定し、か つ干渉測定間隔制御回路４からの停止信号により自己の発光を停止させる発光タ イミング設定回路５と、この発光タイミング設定回路５からの出力信号にしたが って発光素子を発光させる発光素子駆動回路６、および干渉間隔設定回路４をリ セットするためのリセット回路７とを有している。The optical object detection apparatus according to this embodiment includes a signal amplifier 1 for amplifying a light receiving signal from a light receiving element, and an output signal of the signal amplifier 1 A / D according to a predetermined sample signal to set a light emission interval. The A / D converter 2 which outputs as a signal to be displayed, the output signal of the other party from the A / D converter 2 and its own preset light emission timing signal are compared, and when they are different, it is determined that there is an interference signal. An interference signal recognition circuit 3, an interference measurement interval control circuit 4 that sets a time interval for interference measurement, and outputs a stop signal so as to stop self light emission while measuring the light emission timing of the other party, A light emitting type that sets different light emission timings according to the output signal from the interference signal recognition circuit 3 and stops its own light emission by a stop signal from the interference measurement interval control circuit 4. There is provided a resetting circuit 7 for resetting the interference setting circuit 4, a light emitting element drive circuit 6 for causing the light emitting element to emit light in accordance with the output signal from the light emission timing setting circuit 5, and a reset circuit 7 for resetting the interference interval setting circuit 4. is doing.
【００１１】 これら構成部材の更に詳細な構成をその動作説明とともに説明する。まず、リ セット回路７を動作させて、干渉測定間隔制御回路４をリセットする。これによ り自己の発光素子を干渉信号認知回路３により予め設定された発光タイミングで 発行するように発光タイミング設定回路５に指示する。これにより発光タイミン グ設定回路５は所定の発光タイミングで自己の発光素子を発光させるように発光 素子駆動回路６を動作させる。発光素子からの光は所定のエリアに投光された後 、反射し、図示しない受光素子で受光され、その出力が信号増幅器１に印加され る。信号増幅器１からの信号はＡ／Ｄ変換器２によりデジタル信号に変換された 後、干渉信号認知回路３および干渉測定間隔制御回路４に印加される。干渉測定 間隔制御回路４はＡ／Ｄ変換器２からのデジタル信号にしたがって、干渉測定時 間を設定し、自己の発光素子の発光をその時間だけ停止させるために、停止信号 を発光タイミング設定回路５に印加するとともに、干渉信号認知回路３に所定の 時間動作するように作動信号を印加する。この発光が停止している間に干渉信号 認知回路３ではＡ／Ｄ変換器２からの相手の出力信号と自己の予め設定された発 光タイミング信号とを比較し、同じである場合には自己の発光タイミング中に相 手方の発光素子の発光タイミングと一致していないと判断し、その発光タイミン グに固定する。異なる場合には、相手方の発光タイミングが確認できるまでラン ダムに測定間隔を調整しながら測定を繰返し行なう。相手方の発光タイミングが 確認された時は、相手方の発光タイミングとは異なるタイミングで発光するよう に発光タイミング設定回路５を調整し、干渉のない時間間隔で発光するように設 定し、かつ発光停止の解除を干渉測定間隔制御回路４に送る。これにより自動的 に干渉信号の存在しない、すなわち、他の光学式物体検知装置からの光を受光す ることのない、発光タイミングを設定することができる。A more detailed structure of these constituent members will be described together with an explanation of its operation. First, the reset circuit 7 is operated to reset the interference measurement interval control circuit 4. This instructs the light emission timing setting circuit 5 to issue its own light emitting element at the light emission timing preset by the interference signal recognition circuit 3. As a result, the light emission timing setting circuit 5 operates the light emitting element drive circuit 6 so that its own light emitting element emits light at a predetermined light emission timing. The light from the light emitting element is projected onto a predetermined area, then reflected, received by a light receiving element (not shown), and its output is applied to the signal amplifier 1. The signal from the signal amplifier 1 is converted into a digital signal by the A / D converter 2, and then applied to the interference signal recognition circuit 3 and the interference measurement interval control circuit 4. Interference measurement interval control circuit 4 sets the interference measurement time according to the digital signal from A / D converter 2, and in order to stop the light emission of its own light emitting element for that time, a light emission timing setting circuit 5, and an actuation signal is applied to the interference signal recognition circuit 3 so as to operate for a predetermined time. While this light emission is stopped, the interference signal recognition circuit 3 compares the output signal of the other party from the A / D converter 2 with its own preset light emission timing signal, and if they are the same, it During the light emission timing of, it is determined that it does not match the light emission timing of the other light emitting element, and the light emission timing is fixed. If they are different, repeat the measurement while adjusting the measurement interval to the random until the light emission timing of the other party can be confirmed. When the light emission timing of the other party is confirmed, adjust the light emission timing setting circuit 5 so that it emits light at a timing different from the light emission timing of the other party, set it to emit light at time intervals without interference, and stop light emission. Is released to the interference measurement interval control circuit 4. With this, it is possible to automatically set the light emission timing in which no interference signal exists, that is, the light from another optical object detection device is not received.
【００１２】 なお、複数組の発光素子と受光素子を有し、それらを同時に発光させても、こ れら素子や制御回路毎に異なるノイズがあり、また検知エリアの反射レベルや環 境ノイズがあるため、受光のタイミングは微妙に異なり、一致することはないの で、干渉測定は可能である。Even if a plurality of sets of light-emitting elements and light-receiving elements are provided and these elements are made to emit light at the same time, there are different noises for each of these elements and control circuits, and there are reflection levels and environmental noises in the detection area. Therefore, the light receiving timings are slightly different and do not match, so that the interferometric measurement is possible.
【００１３】 上述実施例では、Ａ／Ｄ変換器２、干渉信号認知回路と、干渉測定間隔制御回 路４、発光タイミング設定回路５そしてリセット回路７は別個の回路を構成して いるが、例えば１チップのマイクロコンピュータを使用すれば、これら回路を一 体化することができ、構成は更に簡単になりかつ小型化することができる。In the above-mentioned embodiment, the A / D converter 2, the interference signal recognition circuit, the interference measurement interval control circuit 4, the light emission timing setting circuit 5 and the reset circuit 7 constitute separate circuits. If a one-chip microcomputer is used, these circuits can be integrated, and the configuration can be further simplified and downsized.
【００１４】[0014]
以上のようにこの考案の光学式物体検知装置は、他の光学式物体検知装置から の発光を受光した場合には予め設定された自己の発光間隔とは異なる時間で受光 することになるので、干渉信号認知回路で干渉信号が存在するとして、それを表 わす信号を発光タイミング設定回路に送り、発光間隔を新たに設定するようにな っており、この新たに設定された発光間隔で発光部を発光させ、再びその間隔内 に干渉信号があるかを見て、ある場合には更に異なる発光タイミングの間隔を設 定し、干渉信号の存在が認められなくなった時はこの発光タイミングの調整を一 時的に停止するので、従来のように発光周波数を異ならせるという煩雑な操作を 行なうことなく、自動的に設定することができる。 As described above, the optical object detection device of the present invention receives light emitted from another optical object detection device at a time different from the preset light emission interval of its own, If an interference signal exists in the interference signal recognition circuit, a signal representing it is sent to the light emission timing setting circuit to newly set the light emission interval, and the light emission unit is set at this newly set light emission interval. To see if there is an interference signal within that interval again, and if there is, set a different emission timing interval and adjust the emission timing when the presence of the interference signal is no longer recognized. Since the operation is temporarily stopped, it is possible to automatically set the light emission frequency without performing the complicated operation of changing the light emission frequency.
【図１】この考案の一実施例を示すブロック線図であ
る。FIG. 1 is a block diagram showing an embodiment of the present invention.
１ 信号増幅器 ２ Ａ／Ｄ変換器 ３ 干渉信号認知回路 ４ 干渉測定間隔制御回路 ５ 発光タイミング設定回路 ６ 発光素子駆動回路 1 signal amplifier 2 A / D converter 3 interference signal recognition circuit 4 interference measurement interval control circuit 5 light emission timing setting circuit 6 light emitting element drive circuit
Claims (1)
の反射光を受光部で受光することにより所定のエリアに
おける被検知物体の有無を検知する光学式物体検知装置
において、前記受光部で受光した信号により発光間隔を
測定し、予め設定された自己の発光間隔を表わす信号と
を比較し異なる場合には干渉信号が存在すると判定する
干渉信号認知回路と、この干渉信号認知回路からの出力
信号により前記発光間隔を新たに設定する発光タイミン
グ設定回路とを有することを特徴とする光学式物体検知
装置。1. An optical object detection device for detecting the presence or absence of an object to be detected in a predetermined area by irradiating the object to be detected with light from a light emitting section and receiving the reflected light at a light receiving section. The light emission interval is measured by the signal received by, and the interference signal recognition circuit that determines that there is an interference signal when comparing with a signal representing the preset self light emission interval and the interference signal recognition circuit from this interference signal recognition circuit An optical object detection device comprising: a light emission timing setting circuit that newly sets the light emission interval according to an output signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1992030774U JP2597636Y2 (en) | 1992-04-10 | 1992-04-10 | Optical object detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1992030774U JP2597636Y2 (en) | 1992-04-10 | 1992-04-10 | Optical object detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0581774U true JPH0581774U (en) | 1993-11-05 |
| JP2597636Y2 JP2597636Y2 (en) | 1999-07-12 |
Family
ID=12313036
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1992030774U Expired - Lifetime JP2597636Y2 (en) | 1992-04-10 | 1992-04-10 | Optical object detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2597636Y2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002232284A (en) * | 2001-02-02 | 2002-08-16 | Sunx Ltd | Transmission photoelectric switch |
| JP2006211186A (en) * | 2005-01-27 | 2006-08-10 | Sick Optex Kk | Photoelectric sensor with interference prevention function |
| JP2011208480A (en) * | 2010-03-30 | 2011-10-20 | Kyokko Denki Kk | Object detecting device for automatic door |
-
1992
- 1992-04-10 JP JP1992030774U patent/JP2597636Y2/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002232284A (en) * | 2001-02-02 | 2002-08-16 | Sunx Ltd | Transmission photoelectric switch |
| JP4550298B2 (en) * | 2001-02-02 | 2010-09-22 | サンクス株式会社 | Transmission type photoelectric switch |
| JP2006211186A (en) * | 2005-01-27 | 2006-08-10 | Sick Optex Kk | Photoelectric sensor with interference prevention function |
| JP4579704B2 (en) * | 2005-01-27 | 2010-11-10 | ジック オプテックス株式会社 | Photoelectric sensor with interference prevention function |
| JP2011208480A (en) * | 2010-03-30 | 2011-10-20 | Kyokko Denki Kk | Object detecting device for automatic door |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2597636Y2 (en) | 1999-07-12 |
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