JP2009276283A - Optical phase difference detection type intruding object detecting sensor - Google Patents
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Abstract
Description
本発明は、検知領域への侵入物の有無を検知する光位相差検出式の侵入物検知センサに関する。 The present invention relates to an optical phase difference detection type intruder detection sensor that detects the presence or absence of an intruder in a detection region.
領域内への人体や車両などの侵入物の有無を検知するセンサとしては、超音波を利用して反射波の時間を測定する超音波式センサ、光を利用した三角測量式センサ、光の反射光量を測定する光量検出式センサおよび光位相差検出式センサなどが挙げられる。 Sensors that detect the presence of intruders such as human bodies and vehicles in the area include ultrasonic sensors that measure the time of reflected waves using ultrasonic waves, triangulation sensors that use light, and light reflection. Examples include a light quantity detection sensor and an optical phase difference detection sensor that measure the light quantity.
超音波式センサでは、被検知体の角度変化による影響が大きいといった問題や、周囲の温度変化や風の影響に弱いといった問題がある。 In the ultrasonic sensor, there is a problem that the influence due to the angle change of the detection object is large, and a problem that the ultrasonic sensor is weak against the influence of ambient temperature and wind.
光量検出式センサでは、反射光量を検出するため、被検知体の色の変化に弱いという問題がある。 In the light quantity detection type sensor, since the reflected light quantity is detected, there is a problem that it is vulnerable to a change in the color of the detection object.
三角測量式センサでは、正確に測定するために光のビーム径を小さく絞る必要があり、精密な光学系が必要となる。また、検知領域が小さいため、被検知体の角度や凸凹の影響を受け易い。 In the triangulation type sensor, it is necessary to reduce the beam diameter of light for accurate measurement, and a precise optical system is required. In addition, since the detection area is small, it is easily affected by the angle and unevenness of the detected object.
光位相差検出式センサ（例えば、特許文献１参照）は、投光波と受光波の位相差を検出して被検知体までの距離を測定し、測定距離の変化をとらえることによって侵入物の有無を検知している。これは、上記位相差が被検知体との距離に比例することを利用したものである。それゆえ、光位相差検出式センサは、原理的に温度等の影響に強く、被検知体の色の変化にも強い。
ところで、光位相差検出式センサを用いて比較的広範な検知領域内への侵入物の有無を検知しようとする場合、例えば図１１に示す如く、検知領域ＤＡ内に様々な距離Ｄ１〜Ｄ３が存在し得る（図１１中のＦは固定物）。この場合、侵入物検知センサ１’は距離Ｄ１〜Ｄ３の合成距離を検出することになるため、測定精度が悪化していた。 By the way, when an optical phase difference detection type sensor is used to detect the presence or absence of an intruding object in a relatively wide detection area, for example, as shown in FIG. 11, various distances D1 to D3 exist in the detection area DA. May exist (F in FIG. 11 is a fixed object). In this case, since the intruder detection sensor 1 'detects the combined distance of the distances D1 to D3, the measurement accuracy is deteriorated.
本発明は上記事情に鑑みてなされたものであり、その目的とするところは、検知領域内に様々な距離が存在するような場合でも、正確に侵入物の有無を検知することができる光位相差検出式の侵入物検知センサを提供することにある。 The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a light level capable of accurately detecting the presence or absence of an intruder even when various distances exist within the detection region. An object of the present invention is to provide a phase difference detection type intrusion detection sensor.
上記課題を解決するために本発明は、（１）検知領域への侵入物の有無を検知するセンサであって、前記検知領域をｎ個に分割してなる第１〜第ｎの検知小領域にそれぞれ向かう第１〜第ｎの検出光を、当該各検出光のためにそれぞれ生成される第１周期ごとの第１〜第ｎの投光信号に基づいてそれぞれ投光する投光部と、前記第１〜第ｎの検出光の前記第１〜第ｎの検知小領域からの第１〜第ｎの反射光をそれぞれ受光し、第１〜第ｎの受光信号をそれぞれ生成する受光部と、前記第１周期の自然数倍からなる第２周期ごとに、前記第１〜第ｎの投光信号と前記第１〜第ｎの受光信号との第１〜第ｎの位相差をそれぞれ測定する位相差測定手段と、前記検知領域内に侵入物が無い場合に前記位相差測定手段によって測定されるべき前記第１〜第ｎの位相差を、第１〜第ｎの位相差参照値としてそれぞれ予め記憶した位相差参照値記憶手段と、前記位相差測定手段によって測定された前記第１〜第ｎの位相差と、前記位相差参照値記憶手段に記憶された前記第１〜第ｎの位相差参照値との各差のいずれかが所定範囲外にある場合、前記検知領域内に侵入物が有ると判定する判定手段と、を含んでなることを特徴とする光位相差検出式の侵入物検知センサを提供するものである。 In order to solve the above problems, the present invention is (1) a sensor for detecting the presence or absence of an intruder in a detection area, wherein the first to nth detection small areas are formed by dividing the detection area into n. A light projecting unit that projects the first to nth detection light beams respectively directed to the first based on the first to nth light projection signals for each first period generated for each detection light; A light receiving unit that receives the first to nth reflected light from the first to nth detection subregions of the first to nth detection light, respectively, and generates the first to nth received light signals; The first to n-th phase differences between the first to n-th light projection signals and the first to n-th light-receiving signals are measured for each second cycle that is a natural number multiple of the first cycle. Phase difference measuring means for performing the first difference to be measured by the phase difference measuring means when there is no intruder in the detection region. A phase difference reference value storage means for storing the nth phase difference in advance as first to nth phase difference reference values, and the first to nth phase differences measured by the phase difference measurement means; Determination that determines that there is an intruder in the detection area when any of the differences from the first to nth phase difference reference values stored in the phase difference reference value storage means is outside a predetermined range. And an optical phase difference detection type intrusion detection sensor.
また本発明は、上記構成において、（２）前記投光部は、第１〜第ｎの投光素子と、当該第１〜第ｎの投光素子の投光側に配置された投光レンズとを含み、前記第１〜第ｎの投光素子は、前記第１〜第ｎの検出光を前記投光レンズに向けてそれぞれ投光し、前記投光レンズは、前記第１〜第ｎの投光素子による前記第１〜第ｎの検出光を受けて、当該第１〜第ｎの検出光を前記第１〜第ｎの検知小領域にそれぞれ向かわせるようになっていることを特徴とする光位相差検出式の侵入物検知センサを提供するものである。 Moreover, this invention is the said structure, (2) The said light projection part is a 1st-nth light projection element, and the light projection lens arrange | positioned at the light projection side of the said 1st-nth light projection element And the first to nth light projecting elements project the first to nth detection lights toward the light projecting lens, respectively, and the light projecting lenses include the first to nth light projecting elements. Receiving the first to n-th detection lights by the light projecting elements, and directing the first to n-th detection lights to the first to n-th detection subregions, respectively. An optical phase difference detection type intrusion detection sensor is provided.
また本発明は、上記構成のいずれかにおいて、（３）前記受光部は、第１〜第ｎの受光素子と、当該第１〜第ｎの受光素子の受光側に配置された受光レンズとを含み、前記受光レンズは、前記第１〜第ｎの反射光を受けて、当該第１〜第ｎの反射光を前記第１〜第ｎの受光素子にそれぞれ向かわせるようになっており、前記第１〜第ｎの受光素子は、前記受光レンズからの前記第１〜第ｎの検出光をそれぞれ受光し、前記第１〜第ｎの受光信号をそれぞれ生成することを特徴とする光位相差検出式の侵入物検知センサを提供するものである。 According to the present invention, in any one of the above configurations, (3) the light receiving unit includes: first to nth light receiving elements; and a light receiving lens disposed on a light receiving side of the first to nth light receiving elements. The light receiving lens receives the first to nth reflected lights and directs the first to nth reflected lights to the first to nth light receiving elements, respectively, The first to nth light receiving elements respectively receive the first to nth detection lights from the light receiving lens and generate the first to nth light reception signals, respectively. A detection type intruder detection sensor is provided.
また本発明は、（４）検知領域への侵入物の有無を検知するセンサであって、前記検知領域に向かう検出光を、当該検出光のために生成される第１周期ごとの投光信号に基づいて投光する投光部と、前記検出光の前記検知領域をｎ個に分割してなる第１〜第ｎの検知小領域からの第１〜第ｎの反射光をそれぞれ受光し、第１〜第ｎの受光信号をそれぞれ生成する受光部と、前記第１周期の自然数倍からなる第２周期ごとに、前記投光信号と前記第１〜第ｎの受光信号との第１〜第ｎの位相差をそれぞれ測定する位相差測定手段と、前記検知領域内に侵入物が無い場合に前記位相差測定手段によって測定されるべき前記第１〜第ｎの位相差を、第１〜第ｎの位相差参照値としてそれぞれ予め記憶した位相差参照値記憶手段と、前記位相差測定手段によって測定された前記第１〜第ｎの位相差と、前記位相差参照値記憶手段に記憶された前記第１〜第ｎの位相差参照値との各差のいずれかが所定範囲外にある場合、前記検知領域内に侵入物が有ると判定する判定手段と、を含んでなることを特徴とする光位相差検出式の侵入物検知センサを提供するものである。 Moreover, this invention is a sensor which detects the presence or absence of the intrusion to a detection area | region, Comprising: The light projection signal for every 1st period produced | generated for the said detection light for the detection light which goes to the said detection area | region Receiving the first to n-th reflected light from the first to n-th detection subregions obtained by dividing the detection region of the detection light into n pieces, The light receiving unit that generates the first to nth received light signals, and the first of the light projection signal and the first to nth received light signals for each second period that is a natural number multiple of the first period. A phase difference measuring means for measuring each of the nth phase difference, and the first to nth phase differences to be measured by the phase difference measuring means when there is no intruder in the detection area; A phase difference reference value storage means previously stored as the nth phase difference reference value, and the phase difference measuring means Any one of the differences between the first to n-th phase differences measured by the above and the first to n-th phase difference reference values stored in the phase difference reference value storage means is outside a predetermined range. In this case, an optical phase difference detection type intruder detection sensor is provided that includes a determination unit that determines that there is an intruder in the detection region.
また本発明は、上記構成（４）において、（５）前記投光部は、第１〜第ｎの投光素子と、当該第１〜第ｎの投光素子の投光側に配置された投光レンズとを含み、前記第１〜第ｎの投光素子は、前記検出光を前記投光レンズに向けて投光し、前記投光レンズは、前記第１〜第ｎの投光素子による前記検出光を受けて、当該検出光を前記検知領域に向かわせるようになっていることを特徴とする光位相差検出式の侵入物検知センサを提供するものである。 Moreover, this invention is the said structure (4), (5) The said light projection part is arrange | positioned at the light projection side of the said 1st-nth light projection element and the said 1st-nth light projection element. A light projecting lens, wherein the first to nth light projecting elements project the detection light toward the light projecting lens, and the light projecting lens includes the first to nth light projecting elements. An optical phase difference detection type intrusion detection sensor is provided, which receives the detection light from the above and directs the detection light toward the detection region.
また本発明は、上記構成（４）または（５）において、（６）前記受光部は、第１〜第ｎの受光素子と、当該第１〜第ｎの受光素子の受光側に配置された受光レンズとを含み、前記受光レンズは、前記第１〜第ｎの反射光を受けて、当該第１〜第ｎの反射光を前記第１〜第ｎの受光素子にそれぞれ向かわせるようになっており、前記第１〜第ｎの受光素子は、前記受光レンズからの前記第１〜第ｎの反射光をそれぞれ受光し、前記第１〜第ｎの受光信号をそれぞれ生成することを特徴とする光位相差検出式の侵入物検知センサを提供するものである。 Moreover, this invention is the said structure (4) or (5), (6) The said light-receiving part is arrange | positioned at the light-receiving side of the said 1st-nth light receiving element and the said 1st-nth light receiving element. A light receiving lens, and the light receiving lens receives the first to nth reflected light and directs the first to nth reflected light to the first to nth light receiving elements, respectively. The first to nth light receiving elements receive the first to nth reflected light from the light receiving lens, respectively, and generate the first to nth received light signals, respectively. An optical phase difference detection type intruder detection sensor is provided.
上記のように構成された本発明の侵入物検知センサによれば、検知領域を分割してなるｎ個の検知小領域ごとに、位相差が測定される。つまり、例えば図１１に示す如く検知領域ＤＡ内に様々な距離Ｄ１〜Ｄ３が存在する場合であっても、それらの合成距離が検出されるのではなく、各距離Ｄ１〜Ｄ３がそれぞれ検出され得る。それゆえ、本発明の侵入物検知センサによれば、検知領域内に様々な距離が存在する場合であっても、侵入物の有無を精度良く検知することができる。 According to the intruder detection sensor of the present invention configured as described above, the phase difference is measured for each of n detection small areas obtained by dividing the detection area. That is, for example, as shown in FIG. 11, even when various distances D1 to D3 exist in the detection area DA, their combined distances are not detected, but each distance D1 to D3 can be detected. . Therefore, according to the intruder detection sensor of the present invention, it is possible to accurately detect the presence or absence of an intruder even when various distances exist within the detection region.
以下、図面を参照して本発明の好ましい一実施形態につき説明する。
図１は本発明にかかる光位相差検出式の侵入物検知センサの一例を示す側面図、図２は図１の侵入物検知センサの本体部を示す側断面図である。図３は図１の侵入物検知センサにおける光学素子および光学レンズの配置を示す底面図であり、図４は図１の侵入物検知センサからの検出光およびその反射光を示す概略斜視図である。図５は図１の侵入物検知センサの回路構成を説明するためのブロック図であり、図６は図１の侵入物検知センサにおいて生成される投光信号のタイムチャートである。図７は図１の侵入物検知センサにおいて生成される位相差信号を示すための図である。
Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a side view showing an example of an optical phase difference detection type intrusion detection sensor according to the present invention, and FIG. 2 is a side sectional view showing a main body of the intrusion detection sensor of FIG. 3 is a bottom view showing the arrangement of optical elements and optical lenses in the intruder detection sensor of FIG. 1, and FIG. 4 is a schematic perspective view showing detection light and its reflected light from the intruder detection sensor of FIG. . FIG. 5 is a block diagram for explaining the circuit configuration of the intruder detection sensor of FIG. 1, and FIG. 6 is a time chart of a light projection signal generated in the intruder detection sensor of FIG. FIG. 7 is a diagram illustrating a phase difference signal generated in the intruder detection sensor of FIG.
［全体構成］
図１に示すように、本実施形態にかかる光位相差検出式の侵入物検知センサ１は、侵入物の有無を検知すべき領域の一端に取り付けられるベース部２と、ベース部２に取り付けられた本体部３と、本体部３を覆う透光性のカバー４と、から構成されている。
[overall structure]
As shown in FIG. 1, an optical phase difference detection type intruder detection sensor 1 according to the present embodiment is attached to one end of a region where the presence or absence of an intruder should be detected, and to the base portion 2. Main body part 3 and translucent cover 4 covering main body part 3.
本体部３は主に、図２に示す如く、フレーム３１と、フレーム３１の一方側に取り付けられた基板３２と、基板３２の回路上に接続された投光素子群３３および受光素子群３５と、フレーム３１の他方側に保持された投光レンズ３６および受光レンズ３７と、からなっている。 As shown in FIG. 2, the main body 3 mainly includes a frame 31, a substrate 32 attached to one side of the frame 31, a light projecting element group 33 and a light receiving element group 35 connected on the circuit of the substrate 32. And a light projecting lens 36 and a light receiving lens 37 held on the other side of the frame 31.
フレーム３１は、周壁３１ａと中央壁３１ｂとを有している。周壁３１ａおよび中央壁３１ｂは、投光素子群３３が配置される投光室３１ｃと、受光素子群３５が配置される受光室３１ｄとを形成する。 The frame 31 has a peripheral wall 31a and a central wall 31b. The peripheral wall 31a and the central wall 31b form a light projecting chamber 31c in which the light projecting element group 33 is disposed and a light receiving chamber 31d in which the light receiving element group 35 is disposed.
基板３２は、投光室３１ｃおよび受光室３１ｄの一方側（図２では上側）を閉じるように配置される。基板３２の回路上には、投光素子群３３が、投光室３１ｃ内に収容されるように接続される。投光素子群３３は、図３に示す如く、投光素子３３ｇ（第７の投光素子）を中心にしてその周囲に配置された６つの投光素子３３ａ〜３３ｆ（第１〜第６の投光素子）によって構成されている。投光素子３３ａ〜３３ｇは、図４に示す如く、投光レンズ３６を介して、検知領域ＤＡを７個に分割してなる検知小領域ＤＡ１〜ＤＡ７（第１〜第７の検知小領域）に向かう検出光ＤＬ１〜ＤＬ７（第１〜第７の検出光）をそれぞれ投光する。 The substrate 32 is disposed so as to close one side (the upper side in FIG. 2) of the light projecting chamber 31c and the light receiving chamber 31d. On the circuit of the substrate 32, the light projecting element group 33 is connected so as to be accommodated in the light projecting chamber 31c. As shown in FIG. 3, the light projecting element group 33 has six light projecting elements 33a to 33f (first to sixth) arranged around the light projecting element 33g (seventh light projecting element). (Projecting element). As shown in FIG. 4, the light projecting elements 33 a to 33 g have detection small areas DA <b> 1 to DA <b> 7 (first to seventh detection small areas) obtained by dividing the detection area DA into seven via the light projection lens 36. The detection lights DL1 to DL7 (first to seventh detection lights) heading toward are respectively projected.
また、基板３２の回路上には、受光素子群３５が、受光室３１ｄ内に収容されるように接続される。受光素子群３５は、図３に示す如く、投光素子３３ａ〜３３ｇにそれぞれ対応するように、受光素子３５ｇ（第７の受光素子）を中心にしてその周囲に配置された６つの受光素子３５ａ〜３５ｆ（第１〜第６の受光素子）によって構成されている。受光素子３５ａ〜３５ｇは、図４に示す如く、投光素子３３ａ〜３３ｇから投光された各検出光ＤＬ１〜ＤＬ７の、各検知小領域ＤＡ１〜ＤＡ７からの各反射光Ｒ１〜Ｒ７（第１〜第７の反射光）をそれぞれ受光し、それらに応じて後述する受光信号７１〜７７（第１〜第７の受光信号）をそれぞれ生成する。 On the circuit of the substrate 32, the light receiving element group 35 is connected so as to be accommodated in the light receiving chamber 31d. As shown in FIG. 3, the light receiving element group 35 includes six light receiving elements 35a arranged around the light receiving element 35g (seventh light receiving element) so as to correspond to the light projecting elements 33a to 33g, respectively. To 35f (first to sixth light receiving elements). As shown in FIG. 4, the light receiving elements 35 a to 35 g are respectively reflected light R <b> 1 to R <b> 7 from the detection small areas DA <b> 1 to DA <b> 7 of the detection lights DL <b> 1 to DL <b> 7 projected from the light projection elements 33 a to 33 g (first To seventh reflected light), and light receiving signals 71 to 77 (first to seventh light receiving signals) to be described later are generated accordingly.
投光レンズ３６は、投光室３１ｃの他方側（図２では下側）を閉じるように配置される。投光レンズ３６は、投光素子３３ａ〜３３ｇから投光された光を受けて、各検知小領域ＤＡ１〜ＤＡ７に向かう検出光ＤＬ１〜ＤＬ７を生成するように構成されている。 The light projection lens 36 is disposed so as to close the other side (lower side in FIG. 2) of the light projection chamber 31c. The light projecting lens 36 is configured to receive the light projected from the light projecting elements 33a to 33g and generate detection lights DL1 to DL7 directed to the detection small areas DA1 to DA7.
受光レンズ３７は、受光室３１ｄの他方側（図２では下側）を閉じるように配置される。受光レンズ３７は、検出光ＤＬ１〜ＤＬ７の各検知小領域ＤＡ１〜ＤＡ７からの各反射光Ｒ１〜Ｒ７を、受光素子３５ａ〜３５ｇにそれぞれ向かわせるように構成されている。 The light receiving lens 37 is disposed so as to close the other side (lower side in FIG. 2) of the light receiving chamber 31d. The light receiving lens 37 is configured to direct the reflected lights R1 to R7 from the detection small areas DA1 to DA7 of the detection lights DL1 to DL7 to the light receiving elements 35a to 35g, respectively.
［回路構成］
次に、各投光信号を生成すると共に受光信号を処理して、検知領域への侵入物の有無を検知するための検知回路の構成について説明する。なお、図１〜図３には図示されていないが、検知回路は基板３２上に構成されている。
[Circuit configuration]
Next, a configuration of a detection circuit for generating each light projection signal and processing the light reception signal to detect the presence or absence of an intruder in the detection area will be described. Although not shown in FIGS. 1 to 3, the detection circuit is configured on the substrate 32.
検知回路は、図５に示す如く、投光素子３３ａ〜３３ｇに検出光ＤＬ１〜ＤＬ７を投光させるための投光信号５１〜５７（第１〜第７の投光信号）を生成する投光信号生成回路５と、投光信号生成回路５によって生成された投光信号５１〜５７に基づいて、投光素子３３ａ〜３３ｇに検出光ＤＬ１〜ＤＬ７を投光させる駆動回路６と、を有している。 As shown in FIG. 5, the detection circuit generates light projection signals 51 to 57 (first to seventh light projection signals) for causing the light projection elements 33a to 33g to emit the detection lights DL1 to DL7. A signal generation circuit 5; and a drive circuit 6 for projecting the detection lights DL1 to DL7 to the projection elements 33a to 33g based on the projection signals 51 to 57 generated by the projection signal generation circuit 5. ing.
投光信号生成回路５は、図６に示す如く、周期Ｔ１（第１周期）ごとに、投光素子３３ａ〜３３ｇに対する所定数の投光パルスを含む投光信号５１〜５７をそれぞれ生成する。投光信号５１〜５７は、タイミングがそれぞれ重ならないように順次生成される。駆動回路６は、投光信号５１〜５７に基づいて周期Ｔ１ごとに、各投光素子３３ａ〜３３ｇに検出光ＤＬ１〜ＤＬ７をそれぞれ所定数回投光させる。 As shown in FIG. 6, the projection signal generation circuit 5 generates projection signals 51 to 57 each including a predetermined number of projection pulses for the projection elements 33 a to 33 g for each cycle T <b> 1 (first cycle). The projection signals 51 to 57 are sequentially generated so that the timings do not overlap each other. The drive circuit 6 causes each of the light projecting elements 33a to 33g to project the detection lights DL1 to DL7 a predetermined number of times for each period T1 based on the light projecting signals 51 to 57.
また、検知回路は、図５に示す如く、受光素子３５ａ〜３５ｇが検出光ＤＬ１〜ＤＬ７の反射光Ｒ１〜Ｒ７を受けて生成した受光信号７１〜７７を電圧による信号に変換し、増幅するＩＶ変換回路７ａ〜７ｇを有している。 Further, as shown in FIG. 5, the detection circuit converts the received light signals 71 to 77 generated by the light receiving elements 35a to 35g by receiving the reflected lights R1 to R7 of the detection lights DL1 to DL7 into signals based on voltages, and amplifies them. Conversion circuits 7a to 7g are provided.
また、検知回路は、ＩＶ変換回路７ａ〜７ｇによって変換された後の受光信号７１〜７７を受けるとともに、ミキシング回路１０へ送る受光信号を順次切り替える切替スイッチ１９を有している。切替スイッチ１９は、そのときの反射光に対応する受光信号（例えば、投光素子３３ａによる検出光ＤＬ１の反射光Ｒ１が発生している場合であれば受光素子３５ａによる受光信号７１）のみを、ミキシング回路１０に送るようになっている。切替スイッチ１９における上記切替えのタイミングは、投光信号５１〜５７の生成タイミングに基づいて予め設定されている。 Further, the detection circuit has a changeover switch 19 that receives the light reception signals 71 to 77 after being converted by the IV conversion circuits 7 a to 7 g and sequentially switches the light reception signals to be sent to the mixing circuit 10. The changeover switch 19 only receives a light reception signal corresponding to the reflected light at that time (for example, the light reception signal 71 by the light receiving element 35a if the reflected light R1 of the detection light DL1 by the light projecting element 33a is generated), The signal is sent to the mixing circuit 10. The switching timing in the changeover switch 19 is set in advance based on the generation timing of the light projection signals 51 to 57.
また、検知回路は、ビートダウンを行うべく、ローカル信号を生成するローカル信号生成回路８と、各投光信号５１〜５７をローカル信号とミキシングするミキシング回路９と、ＩＶ変換後の受光信号７１〜７７をローカル信号とミキシングするミキシング回路１０と、を有している。また、検知回路は、ミキシング回路９によって得られた信号の低周波数成分を通過させるローパスフィルタ（ＬＰＦ）１１と、ミキシング回路１０によって得られた信号の低周波数成分を通過させるローパスフィルタ（ＬＰＦ）１２と、を有している。 In addition, the detection circuit performs a beat-down operation, a local signal generation circuit 8 that generates a local signal, a mixing circuit 9 that mixes each of the light projection signals 51 to 57 with a local signal, and a light reception signal 71 after IV conversion. And a mixing circuit 10 for mixing 77 with a local signal. The detection circuit also has a low-pass filter (LPF) 11 that passes the low-frequency component of the signal obtained by the mixing circuit 9 and a low-pass filter (LPF) 12 that passes the low-frequency component of the signal obtained by the mixing circuit 10. And have.
また、検知回路は、ＬＰＦ１１を通過した投光信号５１ａ〜５７ａのタイミングを調整するタイミング調整回路１３と、ＬＰＦ１２を通過した受光信号７１ａ〜７７ａを矩形波にするコンパレータ１４とを有している。 The detection circuit also includes a timing adjustment circuit 13 that adjusts the timing of the light projection signals 51a to 57a that have passed through the LPF 11, and a comparator 14 that converts the light reception signals 71a to 77a that have passed through the LPF 12 into rectangular waves.
ローカル信号生成回路８は、投光信号５１〜５７よりも少し短い周期（換言すれば投光信号５１〜５７の周波数よりも少し高い周波数）のローカル信号（不図示）を生成する。各投光信号５１〜５７は、ミキシング回路９によってローカル信号とミキシングされたのち、ＬＰＦ１１を通過することで、投光信号５１ａ〜５７ａとされる。投光信号５１ａ〜５７ａはさらに、タイミング調整回路１３を通過することで、図７に示す投光信号５１ｂ〜５７ｂとされる。同様に、ＩＶ変換後の受光信号７１〜７７は、ミキシング回路１０によってローカル信号とミキシングされたのち、ＬＰＦ１２を通過することで、受光信号７１ａ〜７７ａとされる。受光信号７１ａ〜７７ａはさらに、コンパレータ１４を通過することで、図７に示す受光信号７１ｂ〜７７ｂとされる。 The local signal generation circuit 8 generates a local signal (not shown) having a period slightly shorter than the light projection signals 51 to 57 (in other words, a frequency slightly higher than the frequency of the light projection signals 51 to 57). Each of the light projection signals 51 to 57 is mixed with the local signal by the mixing circuit 9 and then passed through the LPF 11 to be the light projection signals 51a to 57a. The light projection signals 51a to 57a further pass through the timing adjustment circuit 13 to become the light projection signals 51b to 57b shown in FIG. Similarly, the received light signals 71 to 77 after IV conversion are mixed with local signals by the mixing circuit 10 and then passed through the LPF 12 to become received light signals 71 a to 77 a. The light reception signals 71a to 77a further pass through the comparator 14 to become light reception signals 71b to 77b shown in FIG.
また、検知回路は、投光信号５１ｂ〜５７ｂと受光信号７１ｂ〜７７ｂとをそれぞれ比較し、それらの位相差に関する位相差パルス信号φ１〜φ７を得る位相比較器１５と、位相比較器１５からの位相差パルス信号φ１〜φ７を積分して位相差信号ｐｐ１〜ｐｐ７および位相差電圧値Ｐ１〜Ｐ７を得る積分回路１６とを有している。 In addition, the detection circuit compares the light projection signals 51b to 57b and the light reception signals 71b to 77b, respectively, and obtains phase difference pulse signals φ1 to φ7 related to the phase difference between the phase comparator 15 and the phase comparator 15 And integrating circuit 16 for integrating phase difference pulse signals φ1 to φ7 to obtain phase difference signals pp1 to pp7 and phase difference voltage values P1 to P7.
位相比較器１５は、図７に示す如く、投光信号５１ｂ〜５７ｂと受光信号７１ｂ〜７７ｂとをそれぞれ比較し、各位相差に関する位相差パルス信号φ１〜φ７を周期Ｔ１ごとに生成する。 As shown in FIG. 7, the phase comparator 15 compares the light projection signals 51b to 57b and the light reception signals 71b to 77b, respectively, and generates phase difference pulse signals φ1 to φ7 for each phase difference for each period T1.
積分回路１６は、図７に示す如く、周期Ｔ１ごとに、位相差パルス信号φ１〜φ７を積分して位相差信号ｐｐ１〜ｐｐ７をそれぞれ生成し、各位相差信号ｐｐ１〜ｐｐ７の最大電圧値である位相差電圧値Ｐ１〜Ｐ７をそれぞれ得る。 As shown in FIG. 7, the integration circuit 16 integrates the phase difference pulse signals φ1 to φ7 to generate phase difference signals pp1 to pp7 for each period T1, and is the maximum voltage value of each of the phase difference signals pp1 to pp7. Respective phase difference voltage values P1 to P7 are obtained.
検知回路はさらに、積分回路１６からの位相差電圧値Ｐ１〜Ｐ７が入力されるＣＰＵ１８を有している。ＣＰＵ１８は、図５Ｂに示す如く、各位相差電圧値Ｐ１〜Ｐ７に基づいて、投光信号５１ｂ〜５７ｂと受光信号７１ｂ〜７７ｂとの位相差に関する平均値ＰＡ１〜ＰＡ７（第１〜第７の位相差）をそれぞれ算出する位相差平均値算出手段１８ｂを有している（なお、この位相差平均値算出手段１８ｂと、位相比較器１５と、積分回路１６とが、特許請求の範囲における「位相差測定手段」に該当する）。 The detection circuit further includes a CPU 18 to which the phase difference voltage values P1 to P7 from the integration circuit 16 are input. As shown in FIG. 5B, the CPU 18 determines, based on the phase difference voltage values P1 to P7, average values PA1 to PA7 (first to seventh positions) relating to the phase difference between the light projection signals 51b to 57b and the light reception signals 71b to 77b. The phase difference average value calculating means 18b for calculating each of the phase differences (the phase difference average value calculating means 18b, the phase comparator 15, and the integrating circuit 16 are included in the claims. Corresponding to "phase difference measuring means")
位相差平均値算出手段１８ｂは、周期Ｔ１の自然数倍からなる周期Ｔ２（第２周期）ごとに、位相差電圧値Ｐ１〜Ｐ７の平均値ＰＡ１〜ＰＡ７をそれぞれ算出する。 The phase difference average value calculating means 18b calculates the average values PA1 to PA7 of the phase difference voltage values P1 to P7 for each period T2 (second period) that is a natural number multiple of the period T1.
ＣＰＵ１８はさらに、検知領域（全検知小領域）内に侵入物が無い場合に位相差平均値算出手段１８ｂによって算出されるはずの上記平均値ＰＡ１〜ＰＡ７を、位相差参照値ＰＲ１〜ＰＲ７（第１〜第７の位相差参照値）として予め記憶した位相差参照値記憶手段１８ｄを有している。 The CPU 18 further converts the average values PA1 to PA7 that should be calculated by the phase difference average value calculation means 18b when there is no intruder in the detection area (all detection small areas) to the phase difference reference values PR1 to PR7 (first number). Phase difference reference value storage means 18d stored in advance as first to seventh phase difference reference values).
また、ＣＰＵ１８は、位相差参照値記憶手段１８ｄに記憶された位相差参照値ＰＲ１〜ＰＲ７と、位相差平均値算出手段１８ｂによって算出された平均値ＰＡ１〜ＰＡ７とに基づいて、検知領域内における侵入物の有無を判定し、判定信号を出力する判定手段１８ｅを有している。 In addition, the CPU 18 determines the phase difference reference values PR1 to PR7 stored in the phase difference reference value storage unit 18d and the average values PA1 to PA7 calculated by the phase difference average value calculation unit 18b. It has the determination means 18e which determines the presence or absence of an intruder and outputs a determination signal.
判定手段１８ｅは、位相差平均値算出手段１８ｂによって算出された位相差に関する平均値ＰＡ１〜ＰＡ７と位相差参照値ＰＲ１〜ＰＲ７との差ＰＡ１−ＰＲ１，ＰＡ２−ＰＲ２，・・・，ＰＡ７−ＰＲ７のいずれかが所定範囲外にある場合、検知領域内に侵入物が有ると判定する。反対に、位相差に関する平均値ＰＡ１〜ＰＡ７と位相差参照値ＰＲ１〜ＰＲ７との差ＰＡ１−ＰＲ１，ＰＡ２−ＰＲ２，・・・，ＰＡ７−ＰＲ７のいずれもが所定範囲内である場合、判定手段１８ｅは検知領域内に侵入物は無いと判定する。 The determination unit 18e is configured to detect differences PA1-PR1, PA2-PR2,..., PA7-PR7 between the average values PA1 to PA7 related to the phase difference calculated by the phase difference average value calculation unit 18b and the phase difference reference values PR1 to PR7. If any of these is outside the predetermined range, it is determined that there is an intruder in the detection area. On the other hand, if any of the differences PA1-PR1, PA2-PR2,..., PA7-PR7 between the average values PA1 to PA7 related to the phase difference and the phase difference reference values PR1 to PR7 are within a predetermined range, the determination means 18e determines that there is no intruder in the detection area.
［動作］
以上のように構成された侵入物検知センサ１は、次のように動作する。
まず、投光信号生成回路５によって投光信号５１が生成される。この投光信号５１に基づいて、駆動回路６が投光素子３３ａに検出光ＤＬ１を投光させる。投光素子３３ａからの検出光ＤＬ１は、投光レンズ３６を通過することによって、検知小領域ＤＡ１に向かう。
[Operation]
The intruder detection sensor 1 configured as described above operates as follows.
First, the projection signal 51 is generated by the projection signal generation circuit 5. Based on the light projection signal 51, the drive circuit 6 causes the light projecting element 33a to project the detection light DL1. The detection light DL1 from the light projecting element 33a passes through the light projection lens 36 and travels to the detection small area DA1.
検知小領域ＤＡ１からの反射光Ｒ１は、受光レンズ３７に入射する。反射光Ｒ１は、受光レンズ３７を通過することによって、受光素子３５ａに向かう。受光素子３５ａは、反射光Ｒ１を受光し、受光信号７１を生成する。 The reflected light R1 from the detection small area DA1 enters the light receiving lens 37. The reflected light R1 travels to the light receiving element 35a by passing through the light receiving lens 37. The light receiving element 35a receives the reflected light R1 and generates a light receiving signal 71.
受光信号７１は、ＩＶ変換回路７ａによって、電圧による信号に変換される。変換された後の受光信号７１は、切替スイッチ１９に入力される。切替スイッチ１９は、そのときの反射光に対応する受光信号のみを、ミキシング回路１０に送る。つまり、この段階では、投光素子３３ａによる検出光ＤＬ１の反射光Ｒ１が発生しているので、切替スイッチ１９は、受光素子３５ａによる受光信号７１のみをミキシング回路１０に送る。 The light reception signal 71 is converted into a voltage signal by the IV conversion circuit 7a. The converted light reception signal 71 is input to the changeover switch 19. The changeover switch 19 sends only a light reception signal corresponding to the reflected light at that time to the mixing circuit 10. That is, at this stage, since the reflected light R1 of the detection light DL1 from the light projecting element 33a is generated, the changeover switch 19 sends only the light reception signal 71 from the light receiving element 35a to the mixing circuit 10.
ミキシング回路１０は、切替スイッチ１９からの受光信号７１を、ローカル信号生成回路８によって生成されたローカル信号とミキシングする。ローカル信号とミキシングされた受光信号７１は、ＬＰＦ１２およびコンパレータ１４を通過することで、受光信号７１ｂとされる。受光信号７１ｂは、位相比較器１５に入力される。 The mixing circuit 10 mixes the light reception signal 71 from the changeover switch 19 with the local signal generated by the local signal generation circuit 8. The light reception signal 71 mixed with the local signal is passed through the LPF 12 and the comparator 14 to become a light reception signal 71b. The light reception signal 71 b is input to the phase comparator 15.
一方、投光信号５１は、ミキシング回路９において、ローカル信号生成回路８によって生成された上記ローカル信号とミキシングされる。ローカル信号とミキシングされた投光信号５１は、ＬＰＦ１１およびタイミング調整回路１３を通過することで、投光信号５１ｂとされる。投光信号５１ｂは位相比較器１５に入力される。 On the other hand, the projection signal 51 is mixed in the mixing circuit 9 with the local signal generated by the local signal generation circuit 8. The light projection signal 51 mixed with the local signal passes through the LPF 11 and the timing adjustment circuit 13 to become a light projection signal 51b. The light projection signal 51 b is input to the phase comparator 15.
位相比較器１５は、投光信号５１ｂと受光信号７１ｂとを比較し、位相差に関する位相差パルス信号φ１を生成する。位相差パルス信号φ１は、積分回路１６に入力される。 The phase comparator 15 compares the light projection signal 51b with the light reception signal 71b and generates a phase difference pulse signal φ1 related to the phase difference. The phase difference pulse signal φ1 is input to the integration circuit 16.
積分回路１６は、位相差パルス信号φ１を積分して位相差信号ｐｐ１を生成し、位相差電圧値Ｐ１を得る。位相差電圧値Ｐ１は、ＣＰＵ１８内の位相差平均値算出手段１８ｂに入力される。 The integrating circuit 16 integrates the phase difference pulse signal φ1 to generate a phase difference signal pp1, and obtains a phase difference voltage value P1. The phase difference voltage value P1 is input to the phase difference average value calculation means 18b in the CPU 18.
周期Ｔ１内において、以上の動作が投光信号５２〜５７に対してそれぞれ行なわれ、位相差電圧値Ｐ２〜Ｐ７がＣＰＵ１８内の位相差平均値算出手段１８ｂにそれぞれ入力される。入力された位相差電圧値Ｐ１〜Ｐ７は、位相差平均値算出手段１８ｂによってそれぞれ独立して保持される。 Within the period T1, the above operations are performed on the projection signals 52 to 57, respectively, and the phase difference voltage values P2 to P7 are input to the phase difference average value calculation means 18b in the CPU 18, respectively. The input phase difference voltage values P1 to P7 are independently held by the phase difference average value calculation means 18b.
そして、位相差平均値算出手段１８ｂは、周期Ｔ１ごとに入力された位相差電圧値Ｐ１〜Ｐ７につき、周期Ｔ１の自然数倍からなる周期Ｔ２における平均値ＰＡ１〜ＰＡ７をそれぞれ算出する。各平均値ＰＡ１〜ＰＡ７は、判定手段１８ｅに入力される。 Then, the phase difference average value calculating means 18b calculates the average values PA1 to PA7 in the period T2, which is a natural number multiple of the period T1, for the phase difference voltage values P1 to P7 input every period T1. Each average value PA1-PA7 is input to the determination means 18e.
判定手段１８ｅは、入力された位相差に関する平均値ＰＡ１〜ＰＡ７と、位相差参照値記憶手段１８ｄに記憶された位相差参照値ＰＲ１〜ＰＲ７との差ＰＡ１−ＰＲ１，ＰＡ２−ＰＲ２，・・・，ＰＡ７−ＰＲ７を算出する。算出された差ＰＡ１−ＰＲ１，ＰＡ２−ＰＲ２，・・・，ＰＡ７−ＰＲ７のいずれかが所定範囲外にある場合、判定手段１８ｅは検知領域内に侵入物が有ると判定し、その旨の判定信号を出力する。反対に、算出された差ＰＡ１−ＰＲ１，ＰＡ２−ＰＲ２，・・・，ＰＡ７−ＰＲ７のいずれもが所定範囲内である場合、判定手段１８ｅは検知領域内に侵入物は無いと判定する。 The determination means 18e is a difference PA1-PR1, PA2-PR2,... Between the inputted average values PA1 to PA7 regarding the phase difference and the phase difference reference values PR1 to PR7 stored in the phase difference reference value storage means 18d. , PA7-PR7 is calculated. If any of the calculated differences PA1-PR1, PA2-PR2,..., PA7-PR7 is outside the predetermined range, the determination unit 18e determines that there is an intruder in the detection area, and determines that effect. Output a signal. Conversely, if any of the calculated differences PA1-PR1, PA2-PR2,..., PA7-PR7 is within a predetermined range, the determination unit 18e determines that there is no intruder in the detection area.
以上の動作が繰り返され、周期Ｔ２ごとに検知領域内の侵入物の有無が判定される。 The above operation is repeated, and the presence / absence of an intruder in the detection area is determined every period T2.
［作用・効果］
以上のように構成された侵入物検知センサ１によれば、検知領域ＤＡを７個に分割してなる検知小領域ＤＡ１〜ＤＡ７ごとに、位相差が測定される。つまり、例えば図１１に示す如く検知領域ＤＡ内に様々な距離Ｄ１〜Ｄ３が存在する場合であっても、それらの合成距離が検出されるのではなく、各距離Ｄ１〜Ｄ３がそれぞれ検出され得る。それゆえ、侵入物検知センサ１によれば、検知領域ＤＡ内に様々な距離Ｄ１〜Ｄ３が存在する場合であっても、侵入物の有無を精度良く検知することができる。
[Action / Effect]
According to the intruder detection sensor 1 configured as described above, the phase difference is measured for each of the detection small areas DA1 to DA7 obtained by dividing the detection area DA into seven. That is, for example, as shown in FIG. 11, even when various distances D1 to D3 exist in the detection area DA, their combined distances are not detected, but each distance D1 to D3 can be detected. . Therefore, according to the intruder detection sensor 1, even if various distances D1 to D3 exist in the detection area DA, the presence or absence of the intruder can be detected with high accuracy.
したがって、侵入物検知センサ１によれば、例えば図８Ａに示す如く検知領域ＤＡ内にトイレ（固定物）Ｔが存在する場合であっても、精度良く侵入物検知をすることができ、例えばトイレＴよりも低い位置に人が倒れているような場合であっても、検出光ＤＬ１，ＤＬ４によってそれを正確に検知することができる。 Therefore, according to the intruder detection sensor 1, even when a toilet (fixed object) T exists in the detection area DA as shown in FIG. 8A, for example, an intruder can be detected with high accuracy. Even when a person falls down at a position lower than T, it can be accurately detected by the detection lights DL1 and DL4.
また、侵入物検知センサ１によれば、例えば図８Ｂに示す如く検知領域ＤＡ内に車両Ｃが侵入し、フロントガラスＧの傾斜によって検出光ＤＬ７の反射光Ｒ７を受光できない場合であっても、検出光ＤＬ１，ＤＬ４によって車両Ｃの侵入を検知することができる。 Further, according to the intruder detection sensor 1, even when the vehicle C enters the detection area DA as shown in FIG. 8B and the reflected light R7 of the detection light DL7 cannot be received due to the inclination of the windshield G, The intrusion of the vehicle C can be detected by the detection lights DL1 and DL4.
また、侵入物検知センサ１によれば、各検知小領域ＤＡ１〜ＤＡ７に向かう検出光ＤＬ１〜ＤＬ７は、複数の投光素子３３ａ〜３３ｇに対して投光レンズ３６を配置することによって生成されている。それゆえ、侵入物検知センサ１は、可動機構等の複雑な機構を要することなく、シンプルかつ低コストに構成され得る。 Further, according to the intruder detection sensor 1, the detection lights DL1 to DL7 directed to the detection small areas DA1 to DA7 are generated by disposing the projection lens 36 on the plurality of projection elements 33a to 33g. Yes. Therefore, the intruder detection sensor 1 can be configured simply and at low cost without requiring a complicated mechanism such as a movable mechanism.
［変形例］
以上、本発明の実施形態について具体的に説明したが、本発明は次のように変形して実施することができる。
[Modification]
Although the embodiments of the present invention have been specifically described above, the present invention can be implemented with the following modifications.
例えば、図９Ａに示す如く、切替スイッチ１９を省略することができる。この場合、複数の受光素子３５ａ〜３５ｇが１つの大きな受光素子として機能するかたちになる。この場合であっても、検出光ＤＬ１〜ＤＬ７を順次投光すれば対応する受光信号７１〜７７も順次生成されることになり、各受光信号７１〜７７はそれぞれ区別され得る。よって、切替スイッチ１９を省略した侵入物検知センサ１０１でも、侵入物検知センサ１と同様に侵入物有無を正確に検知することができる。 For example, as shown in FIG. 9A, the changeover switch 19 can be omitted. In this case, the plurality of light receiving elements 35a to 35g function as one large light receiving element. Even in this case, if the detection lights DL1 to DL7 are sequentially projected, the corresponding light reception signals 71 to 77 are also sequentially generated, and the light reception signals 71 to 77 can be distinguished from each other. Therefore, even with the intruder detection sensor 101 in which the changeover switch 19 is omitted, the presence or absence of the intruder can be accurately detected in the same manner as the intruder detection sensor 1.
また、侵入物検知センサ１では受光素子を複数使用したが、単数であってもよい。受光素子が単数であっても、上述したように、検出光ＤＬ１〜ＤＬ７を順次投光すれば、受光信号７１〜７７も順次生成されることになり、各受光信号７１〜７７はそれぞれ区別され得るからである。 Further, although the intruder detection sensor 1 uses a plurality of light receiving elements, it may be singular. Even if there is a single light receiving element, as described above, if the detection lights DL1 to DL7 are sequentially projected, the light receiving signals 71 to 77 are also sequentially generated, and the respective light receiving signals 71 to 77 are distinguished from each other. Because you get.
また、侵入物検知センサ１では投光素子を複数使用したが、図９Ｂに示す如く１つの投光素子３３ｈを使用して、検知領域ＤＡ全体に向かう１つの検出光ＤＬを投光するようにしてもよい。ただしこの場合、各検知小領域ＤＡ１〜ＤＡ７に対して受光素子３５ａ〜３５ｇがそれぞれ設けられ、各受光素子３５ａ〜３５ｇは対応する検知小領域からの反射光のみを受光する。各受光素子３５ａ〜３５ｇによって生成された各受光信号７１〜７７はそれぞれ区別されて、投光信号との位相差がそれぞれ求められる。 In addition, the intruder detection sensor 1 uses a plurality of light projecting elements. However, as shown in FIG. 9B, one light projecting element 33h is used to project one detection light DL toward the entire detection area DA. May be. However, in this case, the light receiving elements 35a to 35g are provided for the respective detection small areas DA1 to DA7, and each of the light reception elements 35a to 35g receives only the reflected light from the corresponding detection small area. The light receiving signals 71 to 77 generated by the light receiving elements 35a to 35g are distinguished from each other, and the phase difference from the light projection signal is obtained.
また、侵入物検知センサ１では複数の投光素子のうちの１個に対して１個の受光素子を対応させていたが、これに限定されるものではない。例えば、複数の投光素子のうちの１個に対して受光素子を複数個対応させてもよく、複数の受光素子のうちの１個に対して投光素子を複数個対応させてもよい。 In the intruder detection sensor 1, one light receiving element is associated with one of the plurality of light projecting elements, but the present invention is not limited to this. For example, a plurality of light receiving elements may be associated with one of the plurality of light projecting elements, or a plurality of light projecting elements may be associated with one of the plurality of light receiving elements.
また、侵入物検知センサ１では、複数の検知小領域ＤＡ１〜ＤＡ７に向かう検出光ＤＬ１〜ＤＬ７を投光レンズ３６によって生成したが、これに限定されない。例えば、投光レンズ３６を用いずに複数の投光素子を使用し、各投光素子を各検知小領域に向くようにそれぞれ配置することによって、複数の検知小領域に向かう検出光をそれぞれ生成してもよい。 Further, in the intruder detection sensor 1, the detection light DL1 to DL7 directed to the plurality of small detection areas DA1 to DA7 is generated by the light projection lens 36, but the present invention is not limited to this. For example, by using a plurality of light projecting elements without using the light projecting lens 36 and arranging each light projecting element so as to face each detection subregion, detection light directed to the plurality of detection subregions is generated. May be.
また、侵入物検知センサ１では検知小領域の数は７個であったが、これに限定されるものではなく、その数は適宜選択され得る。さらに、侵入物検知センサ１では、検知小領域ＤＡ７のまわりに検知小領域ＤＡ２〜ＤＡ７を配置していたが、これらの配置は用途に応じて任意に選択することができ、例えば図１０に示す如く、検知小領域ＤＡ１〜ＤＡ５をライン状に配置することもできる。 In the intruder detection sensor 1, the number of small detection areas is seven. However, the number is not limited to this, and the number can be selected as appropriate. Furthermore, in the intruder detection sensor 1, the detection small areas DA2 to DA7 are arranged around the detection small area DA7. However, these arrangements can be arbitrarily selected according to the application, for example, as shown in FIG. As described above, the detection small areas DA1 to DA5 may be arranged in a line.
また、侵入物検知センサ１によれば、周期Ｔ１の自然数倍からなる周期Ｔ２ごとに位相差電圧値Ｐ１〜Ｐ７の平均値ＰＡ１〜ＰＡ７をそれぞれ算出し、この平均値を用いて侵入物有無を判定したが、平均値をとらずに電圧値Ｐ１〜Ｐ７を直接用いて侵入物有無を判定してもよい。 Moreover, according to the intruder detection sensor 1, the average values PA1 to PA7 of the phase difference voltage values P1 to P7 are calculated for each period T2 that is a natural number multiple of the period T1, and the presence or absence of intruders is calculated using this average value. However, the presence or absence of an intruder may be determined using the voltage values P1 to P7 directly without taking the average value.
ＤＡ 検知領域
ＤＬ１〜ＤＬ７ 検出光
ＰＡ１〜ＰＡ７ 位相差
ＰＲ１〜ＰＲ７ 位相差参照値
Ｒ１〜Ｒ７ 反射光
１ 侵入物検知センサ
１８ｂ 位相差平均値算出部
１８ｄ 位相差参照値記憶手段
１８ｅ 判定手段
３３ａ〜３３ｇ 投光素子
３５ａ〜３５ｇ 受光素子
３６ 投光レンズ
３７ 受光レンズ
５１〜５７ 投光信号
７１〜７７ 受光信号
DA detection areas DL1 to DL7 Detection lights PA1 to PA7 Phase differences PR1 to PR7 Phase difference reference values R1 to R7 Reflected light 1 Intruder detection sensor 18b Phase difference average value calculator 18d Phase difference reference value storage means 18e Determination means 33a to 33g Light Emitting Elements 35a-35g Light Receiving Element 36 Light Emitting Lens 37 Light Receiving Lens 51-57 Light Emitting Signal 71-77 Light Receiving Signal
Claims (6)
前記検知領域をｎ個に分割してなる第１〜第ｎの検知小領域にそれぞれ向かう第１〜第ｎの検出光を、当該各検出光のためにそれぞれ生成される第１周期ごとの第１〜第ｎの投光信号に基づいてそれぞれ投光する投光部と、
前記第１〜第ｎの検出光の前記第１〜第ｎの検知小領域からの第１〜第ｎの反射光をそれぞれ受光し、第１〜第ｎの受光信号をそれぞれ生成する受光部と、
前記第１周期の自然数倍からなる第２周期ごとに、前記第１〜第ｎの投光信号と前記第１〜第ｎの受光信号との第１〜第ｎの位相差をそれぞれ測定する位相差測定手段と、
前記検知領域内に侵入物が無い場合に前記位相差測定手段によって測定されるべき前記第１〜第ｎの位相差を、第１〜第ｎの位相差参照値としてそれぞれ予め記憶した位相差参照値記憶手段と、
前記位相差測定手段によって測定された前記第１〜第ｎの位相差と、前記位相差参照値記憶手段に記憶された前記第１〜第ｎの位相差参照値との各差のいずれかが所定範囲外にある場合、前記検知領域内に侵入物が有ると判定する判定手段と、
を含んでなることを特徴とする光位相差検出式の侵入物検知センサ。 A sensor that detects the presence or absence of an intruder in the detection area,
First to n-th detection lights respectively directed to first to n-th detection sub-areas obtained by dividing the detection area into n pieces are generated for each of the first periods. A light projecting unit that projects light based on each of the 1st to nth light projection signals;
A light receiving unit that receives the first to nth reflected light from the first to nth detection subregions of the first to nth detection light, respectively, and generates the first to nth received light signals; ,
The first to n-th phase differences between the first to n-th light projection signals and the first to n-th light reception signals are measured for each second cycle that is a natural number multiple of the first cycle. Phase difference measuring means;
The first to nth phase differences to be measured by the phase difference measuring means when there are no intruders in the detection area, the phase difference references stored in advance as first to nth phase difference reference values, respectively. Value storage means;
Any one of the differences between the first to nth phase differences measured by the phase difference measuring means and the first to nth phase difference reference values stored in the phase difference reference value storage means is A determination means for determining that there is an intruder in the detection area when outside the predetermined range;
An optical phase difference detection type intrusion detection sensor comprising:
前記第１〜第ｎの投光素子は、前記第１〜第ｎの検出光を前記投光レンズに向けてそれぞれ投光し、
前記投光レンズは、前記第１〜第ｎの投光素子による前記第１〜第ｎの検出光を受けて、当該第１〜第ｎの検出光を前記第１〜第ｎの検知小領域にそれぞれ向かわせるようになっていることを特徴とする請求項１に記載の光位相差検出式の侵入物検知センサ。 The light projecting unit includes first to nth light projecting elements and a light projecting lens disposed on a light projecting side of the first to nth light projecting elements,
The first to nth light projecting elements project the first to nth detection lights toward the light projecting lens, respectively.
The light projecting lens receives the first to nth detection lights from the first to nth light projecting elements and transmits the first to nth detection lights to the first to nth detection subregions. The optical phase difference detection type intruder detection sensor according to claim 1, wherein the intrusion detection sensor is an optical phase difference detection type sensor.
前記受光レンズは、前記第１〜第ｎの反射光を受けて、当該第１〜第ｎの反射光を前記第１〜第ｎの受光素子にそれぞれ向かわせるようになっており、
前記第１〜第ｎの受光素子は、前記受光レンズからの前記第１〜第ｎの検出光をそれぞれ受光し、前記第１〜第ｎの受光信号をそれぞれ生成することを特徴とする請求項１または２に記載の光位相差検出式の侵入物検知センサ。 The light receiving unit includes first to nth light receiving elements and a light receiving lens disposed on a light receiving side of the first to nth light receiving elements,
The light receiving lens receives the first to nth reflected lights and directs the first to nth reflected lights to the first to nth light receiving elements, respectively.
The first to nth light receiving elements respectively receive the first to nth detection lights from the light receiving lens and generate the first to nth light reception signals, respectively. 3. An intrusion detection sensor of the optical phase difference detection type according to 1 or 2.
前記検知領域に向かう検出光を、当該検出光のために生成される第１周期ごとの投光信号に基づいて投光する投光部と、
前記検出光の前記検知領域をｎ個に分割してなる第１〜第ｎの検知小領域からの第１〜第ｎの反射光をそれぞれ受光し、第１〜第ｎの受光信号をそれぞれ生成する受光部と、
前記第１周期の自然数倍からなる第２周期ごとに、前記投光信号と前記第１〜第ｎの受光信号との第１〜第ｎの位相差をそれぞれ測定する位相差測定手段と、
前記検知領域内に侵入物が無い場合に前記位相差測定手段によって測定されるべき前記第１〜第ｎの位相差を、第１〜第ｎの位相差参照値としてそれぞれ予め記憶した位相差参照値記憶手段と、
前記位相差測定手段によって測定された前記第１〜第ｎの位相差と、前記位相差参照値記憶手段に記憶された前記第１〜第ｎの位相差参照値との各差のいずれかが所定範囲外にある場合、前記検知領域内に侵入物が有ると判定する判定手段と、
を含んでなることを特徴とする光位相差検出式の侵入物検知センサ。 A sensor that detects the presence or absence of an intruder in the detection area,
A light projecting unit that projects detection light directed to the detection region based on a light projection signal for each first period generated for the detection light;
The first to nth reflected light from the first to nth small detection areas obtained by dividing the detection area of the detection light into n parts is received, and first to nth received light signals are respectively generated. A light receiving unit,
Phase difference measuring means for measuring the first to nth phase differences between the light projection signal and the first to nth received light signals for each second period consisting of a natural number multiple of the first period;
The first to nth phase differences to be measured by the phase difference measuring means when there are no intruders in the detection area, the phase difference references stored in advance as first to nth phase difference reference values, respectively. Value storage means;
Any one of the differences between the first to nth phase differences measured by the phase difference measuring means and the first to nth phase difference reference values stored in the phase difference reference value storage means is A determination means for determining that there is an intruder in the detection area when outside the predetermined range;
An optical phase difference detection type intrusion detection sensor comprising:
前記第１〜第ｎの投光素子は、前記検出光を前記投光レンズに向けて投光し、
前記投光レンズは、前記第１〜第ｎの投光素子による前記検出光を受けて、当該検出光を前記検知領域に向かわせるようになっていることを特徴とする請求項４に記載の光位相差検出式の侵入物検知センサ。 The light projecting unit includes first to nth light projecting elements and a light projecting lens disposed on a light projecting side of the first to nth light projecting elements,
The first to nth light projecting elements project the detection light toward the light projecting lens,
5. The light projecting lens according to claim 4, wherein the light projecting lens receives the detection light from the first to nth light projecting elements and directs the detection light toward the detection region. Optical phase difference detection type intrusion detection sensor.
前記受光レンズは、前記第１〜第ｎの反射光を受けて、当該第１〜第ｎの反射光を前記第１〜第ｎの受光素子にそれぞれ向かわせるようになっており、
前記第１〜第ｎの受光素子は、前記受光レンズからの前記第１〜第ｎの反射光をそれぞれ受光し、前記第１〜第ｎの受光信号をそれぞれ生成することを特徴とする請求項４または５に記載の光位相差検出式の侵入物検知センサ。 The light receiving unit includes first to nth light receiving elements and a light receiving lens disposed on a light receiving side of the first to nth light receiving elements,
The light receiving lens receives the first to nth reflected lights and directs the first to nth reflected lights to the first to nth light receiving elements, respectively.
The first to nth light receiving elements respectively receive the first to nth reflected light from the light receiving lens and generate the first to nth received light signals, respectively. An optical phase difference detection type intruder detection sensor according to 4 or 5.
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| JP2019164121A (en) * | 2018-01-26 | 2019-09-26 | ジック アーゲー | Photoelectric sensor and object detection method |
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