JP2009244158A - Person sensing detector - Google Patents
Person sensing detector Download PDFInfo
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- JP2009244158A JP2009244158A JP2008092293A JP2008092293A JP2009244158A JP 2009244158 A JP2009244158 A JP 2009244158A JP 2008092293 A JP2008092293 A JP 2008092293A JP 2008092293 A JP2008092293 A JP 2008092293A JP 2009244158 A JP2009244158 A JP 2009244158A
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Abstract
Description
本発明は、検知領域内の人を検知する人感検知器に関する。 The present invention relates to a motion detector that detects a person in a detection area.
たとえば、人感機能付きの照明装置においては、検知領域内の人間の存在を各種センサを用いて検知することにより判断し、人間が存在しているときに、照明するように構成させている。
ここで、人を検出するセンサとしては、赤外線を検知するものが多用されている。
For example, a lighting device with a human sense function is configured to detect the presence of a person in a detection area by using various sensors and to illuminate when a person is present.
Here, as a sensor for detecting a person, a sensor for detecting infrared rays is frequently used.
しかしながら、赤外線を検出する人感検知器にあっては、検知する領域の背景温度が高い場合には、人が放射する赤外線量と、検知領域での背景的な熱量の差分が相対的に少なくなるため、誤検知が生じやすくなる。
これを解消するため人感検知器の検出感度を高めると、例えば検出領域内の日射量が僅かに変化した場合など、誤検知が誘発される不具合がある。
However, in a human detector that detects infrared rays, when the background temperature of the detection area is high, the difference between the amount of infrared radiation emitted by a person and the background heat quantity in the detection area is relatively small. Therefore, false detection is likely to occur.
If the detection sensitivity of the motion detector is increased in order to solve this problem, there is a problem that erroneous detection is induced, for example, when the amount of solar radiation in the detection region slightly changes.
これらの不具合を解消するため、例えば特許文献1に示されるように、検知領域の温度変化に追随させて赤外線検知器の検知閾値を一定時間ごとに更新させるものが知られている。
しかしながら、検知領域の温度変化に追随させて赤外線検知器の検知閾値を一定時間ごとに更新させるためには、検知器の複雑化を招き易いと共に、検知のための閾値は、温度変化に基づいて一定時間後に更新されるため、検知器を動作させた直後は、従来と同様に誤検知が発生する虞があった。
本発明は、上記問題点に鑑みなされたもので、簡単な構成で、誤検知を軽減できる人感検知器を提供することを目的とする。
However, in order to follow the temperature change in the detection region and update the detection threshold of the infrared detector at regular intervals, the detector is likely to be complicated, and the threshold for detection is based on the temperature change. Since it is updated after a certain period of time, there is a risk that erroneous detection will occur immediately after the detector is operated as in the conventional case.
The present invention has been made in view of the above problems, and an object thereof is to provide a human detector that can reduce false detection with a simple configuration.
本発明による人感検知器は、検知領域内の人体から発生する赤外線を検出する赤外線検出手段と、赤外線検出手段から出力される検出信号が所定の閾値よりも大きいか否かを判定する判定手段と、赤外線検出手段の検知感度を変化させる感度変更手段と、検知領域の温度を検出する温度センサと、少なくとも温度センサによって検出された検知領域の温度が所定値以上の場合に、感度変更手段による感度変更を有効とする切替手段と、を具備していることを特徴とする。 The human detector according to the present invention includes an infrared detection unit that detects infrared rays generated from a human body in a detection region, and a determination unit that determines whether a detection signal output from the infrared detection unit is greater than a predetermined threshold value. A sensitivity changing means for changing the detection sensitivity of the infrared detection means, a temperature sensor for detecting the temperature of the detection area, and at least when the temperature of the detection area detected by the temperature sensor is equal to or higher than a predetermined value, Switching means for enabling the sensitivity change to be effective.
本発明によれば、温度センサによって検出された検知領域の温度が所定値以上の場合に、赤外線検出手段の感度が変更可能となるため、簡単な構成で、人感検知器の動作直後から検知領域の背景的な熱量に起因した誤検知の軽減が期待できる。 According to the present invention, when the temperature of the detection area detected by the temperature sensor is equal to or higher than a predetermined value, the sensitivity of the infrared detecting means can be changed, so that detection is performed immediately after the motion detector is operated with a simple configuration. The reduction of false detection caused by the background heat quantity of the area can be expected.
以下、本発明の人感検知器の一形態を、図1に基づいて説明する。
図1は、照明装置Lの動作を検知信号によりON/OFF制御するために適用した人感検知器1を示す概念ブロックである。
つまり、室内のような検知領域における人の存在・不在を判断し、検知領域における人の存在・不在に応じて照明装置のオンオフを制御するものである。
Hereinafter, an embodiment of the motion detector of the present invention will be described with reference to FIG.
FIG. 1 is a conceptual block diagram showing a human detector 1 applied for ON / OFF control of the operation of the lighting device L by a detection signal.
That is, the presence / absence of a person in a detection area such as a room is determined, and the lighting device is controlled to be turned on / off according to the presence / absence of the person in the detection area.
赤外線検出手段11は、例えば熱線式の焦電センサより構成され、その検出信号は増幅器12に出力される。増幅器12は、赤外線検出手段11の出力を増幅し、後段の比較器13で、人の動きに相当するレベルの信号を抽出する。 The infrared detection means 11 is composed of, for example, a hot-wire pyroelectric sensor, and the detection signal is output to the amplifier 12. The amplifier 12 amplifies the output of the infrared detecting means 11, and the comparator 13 at the subsequent stage extracts a signal having a level corresponding to a human movement.
焦電素子は受光する熱線量(赤外線量)の変化率に応じた電圧出力が得られる微分型のセンサであり、室内の室温変化などによって生じる熱線量の緩やかな変化に対しては焦電素子からの出力は小さいため、比較器13では、この種の雑音成分を除去する作用も奏している。
また、比較器13は波形整形機能も兼ねており、赤外線検出手段11で検出される人の動きに対応した比較器13の出力は矩形波状になる。
The pyroelectric element is a differential sensor that can obtain a voltage output according to the rate of change of the received heat dose (infrared ray amount), and is suitable for the gentle change in heat dose caused by room temperature changes in the room. Since the output from is small, the comparator 13 also has an effect of removing this kind of noise component.
The comparator 13 also functions as a waveform shaping function, and the output of the comparator 13 corresponding to the movement of the person detected by the infrared detecting means 11 is a rectangular wave.
なお、図示しないが焦電素子の受光面の前方には、焦電素子の視野内で感度指向性を付与した受光レンズを配置するのが望ましく、このような受光レンズを用いることにより焦電素子の視野内で人が手を動かす程度の動きでも焦電素子に入射する熱線量が変化し、比較器13から人の動きに対応する出力が得られるようになる。
赤外線検出手段11の出力に応じた比較器13の出力は検知処理部20に入力される。
検知処理部20は、比較器13から入力される信号が、所定の閾値よりも大きいか否かを判定する判定手段として作用する。
Although not shown, it is desirable to dispose a light receiving lens having sensitivity directivity in the field of view of the pyroelectric element in front of the light receiving surface of the pyroelectric element. By using such a light receiving lens, the pyroelectric element Even when the person moves his / her hand within the field of view, the heat dose incident on the pyroelectric element changes, and an output corresponding to the movement of the person can be obtained from the comparator 13.
The output of the comparator 13 corresponding to the output of the infrared detection means 11 is input to the detection processing unit 20.
The detection processing unit 20 functions as a determination unit that determines whether the signal input from the comparator 13 is greater than a predetermined threshold value.
すなわち、検知処理部20では、閾値、例えば矩形波状の信号が規定した時間内に規定した個数以上の信号が入力されると、検知領域内に人が存在すると判断する(人検知と判断する)。 That is, the detection processing unit 20 determines that there is a person in the detection area when a threshold value, for example, a signal equal to or greater than the number specified within the time specified by the rectangular wave signal is input (determines human detection). .
検知処理部20の信号出力は、商用電源(図示せず)と照明装置Lとの間の給電経路に挿入されるスイッチ回路SWに入力され、スイッチ回路SWに内蔵されたスイッチ要素(リレーまたは3端子双方向サイリスタを用いる)を開閉制御することにより照明装置Lへの電源を入切する。
また、人感検知器1には温度センサ31が内蔵されており、赤外線検出手段11と同様に、その出力は、第2の増幅器32及び比較器33に順次入力される。
なお、本実施形態においては、温度センサ31を人感検知器1に内蔵させているが、これに限らず別置にしても良い。
比較器33は、温度センサ31の出力が例えば摂氏30度に相当する所定の閾値を超えると、切替器41に対して、ON信号を出力するように構成されている。
切替器41は、比較器33からON信号を入力すると、赤外線検出手段11に接続された増幅器12及び比較器13に対して、電気信号を出力する。
本実施形態においては、これら増幅器12及び比較器13が赤外線検出手段11の検出感度を変化させる感度変更手段Aを構成している。
The signal output of the detection processing unit 20 is input to a switch circuit SW inserted in a power supply path between a commercial power source (not shown) and the lighting device L, and is switched to a switch element (relay or 3) built in the switch circuit SW. The lighting device L is turned on and off by controlling the opening and closing of the terminal bidirectional thyristor.
Further, the human detector 1 has a built-in temperature sensor 31, and the output thereof is sequentially input to the second amplifier 32 and the comparator 33, similarly to the infrared detector 11.
In the present embodiment, the temperature sensor 31 is built in the motion detector 1, but the present invention is not limited to this and may be provided separately.
The comparator 33 is configured to output an ON signal to the switch 41 when the output of the temperature sensor 31 exceeds a predetermined threshold value corresponding to, for example, 30 degrees Celsius.
When the switch 41 receives an ON signal from the comparator 33, the switch 41 outputs an electrical signal to the amplifier 12 and the comparator 13 connected to the infrared detecting means 11.
In this embodiment, the amplifier 12 and the comparator 13 constitute sensitivity changing means A that changes the detection sensitivity of the infrared detecting means 11.
つまり、増幅器12が、切替器41のON信号を入力すると、その増幅率を例えば20%上昇させ、また、比較器13は、所定の閾値を引き下げて動作し、これらの結果、赤外線検出手段11の検知感度が高められることになる。 That is, when the amplifier 12 inputs the ON signal of the switching device 41, the amplification factor is increased by, for example, 20%, and the comparator 13 operates by lowering a predetermined threshold value. As a result, the infrared detecting means 11 This increases the sensitivity of detection.
したがって、室内の温度が高い場合には、人が放射する赤外線量と、検知領域での背景的な熱量の差分が相対的に少なくなるため、人の感知は難しくなるものの、温度センサ31の出力に応じて、切替器41は、赤外線検出手段11の信号増幅率の上昇及び比較器13での閾値下降を有効にするため、人の検出感度が高められ、よって簡単な構成で検知精度の向上が期待できるものである。 Therefore, when the indoor temperature is high, the difference between the amount of infrared rays radiated by a person and the background heat quantity in the detection area is relatively small. Accordingly, the switching device 41 enables the increase in the signal amplification factor of the infrared detection means 11 and the decrease in the threshold value in the comparator 13, so that the human detection sensitivity is increased, and thus the detection accuracy is improved with a simple configuration. Can be expected.
また、室温が所定よりも高くない場合には、赤外線検出手段11の信号増幅率の上昇及び比較器13での閾値降下、換言すれば、赤外線検出手段11の感度変更は、有効とされないため、例えば室内への日照量の変化などの外乱に応じた誤検知を未然に抑制できることになる。 Further, when the room temperature is not higher than a predetermined value, the increase in the signal amplification factor of the infrared detection means 11 and the threshold value drop in the comparator 13, in other words, the sensitivity change of the infrared detection means 11 is not effective. For example, erroneous detection according to disturbance such as a change in the amount of sunlight into the room can be suppressed in advance.
なお、上記実施の形態においては、切替器41は、室温が所定温度以上の場合に、赤外線検出手段11の信号増幅率及び比較器13での閾値の双方を変化させ、赤外線検出手段11の検出感度の変更を有効としているが、これらどちらか一方のみを変化させるように構成させても良い。
さらには、それら増幅率や閾値の変更は、温度センサにより検出された検知領域の温度に応じて連続的に変化させても良い。
In the above embodiment, when the room temperature is equal to or higher than the predetermined temperature, the switching device 41 changes both the signal amplification factor of the infrared detection means 11 and the threshold value in the comparator 13 to detect the infrared detection means 11. Although changing the sensitivity is effective, it may be configured to change only one of them.
Furthermore, the change of the amplification factor and the threshold value may be continuously changed according to the temperature of the detection region detected by the temperature sensor.
1 人感検知器
11 赤外線検出手段
12,32 増幅器
13,33 比較器
20 検知処理部(判定手段)
41 切替器
A 感度変更手段
SW スイッチ回路
L 照明装置
1 Human detector 11 Infrared detector 12, 32 Amplifier 13, 33 Comparator 20 Detection processing unit (determination unit)
41 Switch A Sensitivity changing means SW Switch circuit L Lighting device
Claims (1)
赤外線検出手段から出力される検出信号が所定の閾値よりも大きいか否かを判定する判定手段と;
赤外線検出手段の検知感度を変化させる感度変更手段と;
検知領域の温度を検出する温度センサと;
少なくとも温度センサによって検出された検知領域の温度が所定値以上の場合に、感度変更手段による感度変更を有効とする切替手段と;
を具備していることを特徴とする人感検知器。 Infrared detecting means for detecting infrared rays generated from the human body in the detection area;
Determining means for determining whether or not the detection signal output from the infrared detecting means is greater than a predetermined threshold;
Sensitivity changing means for changing the detection sensitivity of the infrared detecting means;
A temperature sensor for detecting the temperature of the detection area;
Switching means for enabling sensitivity change by the sensitivity change means when at least the temperature of the detection region detected by the temperature sensor is equal to or higher than a predetermined value;
A human detector characterized by comprising:
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014032486A (en) * | 2012-08-02 | 2014-02-20 | Atsumi Electric Co Ltd | Beam sensor signal processing circuit |
WO2016157723A1 (en) * | 2015-03-27 | 2016-10-06 | パナソニックIpマネジメント株式会社 | Electronic device and pyroelectric sensor |
JP2019045236A (en) * | 2017-08-31 | 2019-03-22 | パナソニックIpマネジメント株式会社 | Person detection system, program and person detection method |
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2008
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014032486A (en) * | 2012-08-02 | 2014-02-20 | Atsumi Electric Co Ltd | Beam sensor signal processing circuit |
WO2016157723A1 (en) * | 2015-03-27 | 2016-10-06 | パナソニックIpマネジメント株式会社 | Electronic device and pyroelectric sensor |
CN107430029A (en) * | 2015-03-27 | 2017-12-01 | 松下知识产权经营株式会社 | Electronic equipment and thermoelectric pickup |
EP3276314A4 (en) * | 2015-03-27 | 2018-04-04 | Panasonic Intellectual Property Management Co., Ltd. | Electronic device and pyroelectric sensor |
US10458850B2 (en) | 2015-03-27 | 2019-10-29 | Panasonic Intellectual Property Management Co., Ltd. | Electronic device and pyroelectric sensor |
JP2019045236A (en) * | 2017-08-31 | 2019-03-22 | パナソニックIpマネジメント株式会社 | Person detection system, program and person detection method |
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