JP2013086784A - Light source identification apparatus and light source identification method - Google Patents
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本発明は、光源識別装置及び光源識別方法に関し、特に、人工光と自然光とを識別できる光源識別装置及び光源識別方法に関する。 The present invention relates to a light source identification device and a light source identification method, and more particularly to a light source identification device and a light source identification method capable of identifying artificial light and natural light.
従来から、直射日光等の自然光と、人工的に作り出された照明光と、を識別する光源識別装置が自動車等に応用されていた。たとえば、車両用ライト自動点消灯装置には、夜間やトンネル内等でのヘッドライト自動点灯と、ヘッドライト等が不要な状況での自動消灯と、を制御するために光源識別手段が必要である。この場合、トンネル等の照明灯や対向車のヘッドライトが照射されても、それが自然光の明るさであると誤判定してヘッドライト等を消灯することがあってはならない。 Conventionally, a light source identification device for identifying natural light such as direct sunlight and artificially created illumination light has been applied to automobiles and the like. For example, an automatic light on / off device for a vehicle requires a light source identification means for controlling automatic lighting of a headlight at night or in a tunnel, and automatic turning off when a headlight or the like is unnecessary. . In this case, even if an illumination light such as a tunnel or a headlight of an oncoming vehicle is irradiated, the headlight or the like should not be turned off by misjudging that it is the brightness of natural light.
たとえば、特許文献１に開示されているように、可視光領域の光量を検出する可視光検出センサと、赤外光領域の光量を検出する赤外光検出センサと、センサからの検出結果に基づいて点消灯を制御する点消灯制御部と、を備え、可視光または赤外光のどちらか一方の光量が所定光量に達していない場合は人工光であると判定してライトの点消灯を制御する自動点消灯装置がある。この点消灯制御には、可視光検出と赤外光検出とを用いた光源識別方法が組み込まれた。 For example, as disclosed in Patent Document 1, a visible light detection sensor that detects a light amount in a visible light region, an infrared light detection sensor that detects a light amount in an infrared light region, and a detection result from the sensor. And a lighting on / off control unit that controls lighting on / off, and controls whether the light is turned on / off by determining that it is artificial light when the light amount of either visible light or infrared light does not reach the predetermined light amount. There is an automatic turn-off device to do. A light source identification method using visible light detection and infrared light detection is incorporated in the lighting control.
ところが、近年、高輝度で可視光と赤外光とに亘って波長分布を有するハロゲンランプ等によって人工照明が明るくなった。そのため、可視光と赤外光との両方の光量が所定光量に達していると、誤判断が生じる問題を有していた。 However, in recent years, artificial lighting has become brighter with a halogen lamp or the like having a high luminance and a wavelength distribution over visible light and infrared light. Therefore, there has been a problem that erroneous determination occurs when the amount of both visible light and infrared light reaches a predetermined amount.
そこで、特許文献２に開示されているように、紫外光センサを追加して、紫外光の光の照度が所定値よりも小さく、可視光または赤外光の光の照度が所定値よりも大きい場合に、人工光であると判定する人工光検出時点灯切替手段を備えた車両用ライト制御装置が開発されている。これによれば、太陽光には紫外光が含まれることから、紫外光が弱いときには人工光であるとして判定する光源識別方法が組み込まれた。 Therefore, as disclosed in Patent Document 2, an ultraviolet light sensor is added so that the illuminance of ultraviolet light is smaller than a predetermined value, and the illuminance of visible light or infrared light is larger than a predetermined value. In some cases, a vehicle light control device has been developed that includes lighting switching means for detecting artificial light that is determined to be artificial light. According to this, since sunlight contains ultraviolet light, a light source identification method for determining as artificial light when the ultraviolet light is weak is incorporated.
しかしながら、このような光源識別装置において、通常、光センサの車両への取り付け位置はフロントガラスの内側（車室内）である。そのため、紫外光及び赤外光の透過率が小さい車両用フロントガラスが普及するにつれて、紫外光を識別に用いることは困難になった。図１３は、車両用のフロントガラスの透過率を測定した事例である。合わせガラスの構成により、４００ｎｍ以下の紫外光の透過がほとんどカットされていることが分かる。このようなフロントガラスの場合では、紫外光センサの照度（光強度）に対する所定値（閾値）を相対的に小さくしなければならないので、ノイズによる誤判定がないように高精度の紫外線センサを用いる必要があった。 However, in such a light source identification device, the attachment position of the optical sensor to the vehicle is usually inside the windshield (in the vehicle compartment). For this reason, it has become difficult to use ultraviolet light for identification as vehicle windshields having low transmittance of ultraviolet light and infrared light have become widespread. FIG. 13 shows an example of measuring the transmittance of a vehicle windshield. It can be seen that the transmission of ultraviolet light of 400 nm or less is almost cut by the structure of the laminated glass. In the case of such a windshield, since a predetermined value (threshold value) for the illuminance (light intensity) of the ultraviolet light sensor must be relatively small, a high-precision ultraviolet sensor is used so as to prevent erroneous determination due to noise. There was a need.
一方、近年では、ビルや家屋内の照明設備や空調設備においても人体検知センサ等によって、きめ細かい制御がおこなわれるようになってきており、さらに、人工光と自然光の場合とで制御パターンを変えることも検討されている。屋外の直射日光に比べて、屋内においてガラスやプラスチック等を透過して射し込んでくる自然光では、紫外光がガラス等の吸収によって著しく減衰している。したがって、適度な光量の屋内照明が点灯している状況下で、屋外から差し込んできている日光の強さに応じて照明の制御や空調の制御をおこなう屋内用制御システムには、特許文献１や特許文献２に開示されている車両用の光源識別方法を適用することはできない。 On the other hand, in recent years, fine control has been performed by human body detection sensors in buildings and indoor lighting equipment and air conditioning equipment, and the control pattern can be changed between artificial light and natural light. Has also been considered. Compared with outdoor direct sunlight, in the natural light that is transmitted through glass and plastic indoors, the ultraviolet light is significantly attenuated by the absorption of glass and the like. Therefore, in an indoor control system that performs illumination control and air conditioning control according to the intensity of sunlight that is inserted from the outside in a situation where indoor light of an appropriate amount of light is lit, Patent Document 1 and The vehicle light source identification method disclosed in Patent Document 2 cannot be applied.
本発明は上記課題を解決するためのものであり、人工光と自然光とを識別できる光源識別装置及び光源識別方法を提供することを目的とする。 The present invention has been made to solve the above-described problems, and an object thereof is to provide a light source identification device and a light source identification method capable of identifying artificial light and natural light.
本発明は、特定の波長域の光強度を測定する複数の光検知部と、前記複数の光検知部の測定値を比較して自然光と人工光とを識別する判断部と、を備えた光源識別装置であって、前記複数の光検知部は、透過する可視光の波長を制限する第１の波長制限フィルタを設けた第１の光検知部と、前記第１の波長制限フィルタよりも長波長の可視光を透過する第２の波長制限フィルタを設けた第２の光検知部と、を少なくとも有し、前記第１の波長制限フィルタは波長４８０ｎｍ〜５２０ｎｍの波長域の可視光を透過する光学フィルタである、ことを特徴とする。 The present invention provides a light source comprising: a plurality of light detection units that measure light intensity in a specific wavelength range; and a determination unit that compares the measurement values of the plurality of light detection units to identify natural light and artificial light. In the identification device, the plurality of light detection units include a first light detection unit provided with a first wavelength limiting filter that limits a wavelength of transmitted visible light, and longer than the first wavelength limiting filter. A second light detection unit provided with a second wavelength limiting filter that transmits visible light having a wavelength, and the first wavelength limiting filter transmits visible light in a wavelength range of 480 nm to 520 nm. It is an optical filter.
これにより、可視光の波長域だけを検知して、自然光と人工光との特徴的な差異を有する波長４８０ｎｍ〜５２０ｎｍの可視光強度を測定する。この波長の可視光強度の測定値と、それよりも長波長の可視光の波長域における光強度の測定値とを比較することにより、窓ガラスを通して紫外光が減衰した自然光であっても、そのような自然光と室内照明による人工光とを判別することが可能になる。 Thereby, only the wavelength range of visible light is detected, and the visible light intensity at a wavelength of 480 nm to 520 nm having a characteristic difference between natural light and artificial light is measured. By comparing the measured value of the visible light intensity of this wavelength with the measured value of the light intensity in the wavelength range of visible light longer than that, even natural light whose ultraviolet light is attenuated through the window glass It is possible to discriminate between such natural light and artificial light by indoor lighting.
したがって、人工光と自然光とを識別できる。 Therefore, artificial light and natural light can be distinguished.
さらに、前記第２の波長制限フィルタは波長５２５ｎｍ〜５６５ｎｍの波長域の可視光を透過する光学フィルタであることが好適である。第１の波長制限フィルタの波長域に対して、第２の波長制限フィルタの波長域での光強度を相対比較して、自然光で期待される比較値に対して第２の波長制限フィルタの波長域での光強度が大きければ、人工光であると判定できる。 Furthermore, it is preferable that the second wavelength limiting filter is an optical filter that transmits visible light having a wavelength range of 525 nm to 565 nm. The light intensity in the wavelength range of the second wavelength limiting filter is relatively compared with the wavelength range of the first wavelength limiting filter, and the wavelength of the second wavelength limiting filter is compared with the comparison value expected for natural light. If the light intensity in the region is large, it can be determined that the light is artificial light.
前記判断部は前記第１の光検知部の測定値に対して、前記第２の光検知部の測定値の比率が、第１の閾値以上であるときに、人工光として判定した識別信号を出力することが好ましい。こうすれば、第１の波長制限フィルタの波長域に対して、第２の波長制限フィルタの波長域で光強度が大きいかどうかを、測定値の比率で判定するので、自然光と人工光とを識別することが容易である。 The determination unit determines an identification signal determined as artificial light when the ratio of the measurement value of the second light detection unit to the measurement value of the first light detection unit is equal to or greater than a first threshold value. It is preferable to output. If it carries out like this, since it is determined by the ratio of a measured value whether light intensity is large in the wavelength range of the 2nd wavelength limiting filter with respect to the wavelength range of the 1st wavelength limiting filter, natural light and artificial light are Easy to identify.
前記複数の光検知部は、前記第２の波長制限フィルタよりも長波長の可視光を透過する第３の波長制限フィルタを設けた第３の光検知部を有し、前記判断部は、前記第１の光検知部の測定値に対して前記第２の光検知部の測定値の比率が第１の閾値以下であるとともに、前記第１の光検知部の測定値または前記第２の光検知部の測定値に対して前記第３の光検知部の測定値の比率が第２の閾値以上であるときに、自然光として判定した識別信号を出力することが好ましい。こうすれば、第１の波長制限フィルタの波長域に対して、第２の波長制限フィルタの波長域で光強度があまり大きくないような特殊な照明光の環境下においても、第３の光検知部の測定値も使うことによって、自然光と人工光とを正確に識別できる。 The plurality of light detection units includes a third light detection unit provided with a third wavelength limiting filter that transmits visible light having a longer wavelength than the second wavelength limiting filter, and the determination unit includes: The ratio of the measurement value of the second light detection unit to the measurement value of the first light detection unit is equal to or less than a first threshold, and the measurement value of the first light detection unit or the second light It is preferable that the identification signal determined as natural light is output when the ratio of the measurement value of the third light detection unit to the measurement value of the detection unit is equal to or greater than the second threshold value. In this way, the third light detection is performed even in a special illumination light environment in which the light intensity is not so high in the wavelength range of the second wavelength limiting filter with respect to the wavelength range of the first wavelength limiting filter. By using the measured value of the part, natural light and artificial light can be accurately distinguished.
前記第３の波長制限フィルタは波長７００ｎｍ〜７５０ｎｍの波長域の可視光を透過する光学フィルタであることが好適である。これにより、第３の波長制限フィルタの波長域での光強度が大きければ自然光が入射している状況であることが判定できる。 The third wavelength limiting filter is preferably an optical filter that transmits visible light in a wavelength range of 700 nm to 750 nm. Thereby, if the light intensity in the wavelength region of the third wavelength limiting filter is high, it can be determined that natural light is incident.
本発明は、特定の波長域の光強度を測定する第１の光検知部及び第２の光検知部と、前記第１の光検知部の測定値及び前記第２の光検知部の測定値を比較して自然光と人工光とを識別する判断部と、を備えた光源識別装置の光源識別方法であって、前記第１の光検知部で測定される波長４８０ｎｍ〜５２０ｎｍの波長域の可視光強度の測定値と、前記第１の光検知部で測定される波長域よりも長波長の可視光強度が測定される前記第２の光検知部の測定値と、を取得するステップと、前記第１の光検知部の測定値に対する前記第２の光検知部の測定値の比率が第１の閾値以上であるかを判定するステップとを有することを特徴とする。 The present invention provides a first light detection unit and a second light detection unit that measure light intensity in a specific wavelength range, a measurement value of the first light detection unit, and a measurement value of the second light detection unit. A light source identification method for a light source identification device comprising: a determination unit that compares natural light and artificial light by comparing, and is visible in a wavelength region of 480 nm to 520 nm measured by the first light detection unit Obtaining a measurement value of light intensity and a measurement value of the second light detection unit in which visible light intensity of a wavelength longer than the wavelength range measured by the first light detection unit is measured; Determining whether the ratio of the measurement value of the second light detection unit to the measurement value of the first light detection unit is equal to or greater than a first threshold value.
こうすれば、第１の光検知部と第２の光検知部との特定波長域の光強度を測定して、第１の光検知部の光強度または第２の光検知部の光強度が所定の明るさに対応する光強度を有する環境下において、第１の光検知部の測定値に対する第２の光検知部の測定値の比率によって、自然光と人工光とを識別することができる。 If it carries out like this, the light intensity of the specific wavelength range of the 1st light detection part and the 2nd light detection part will be measured, and the light intensity of the 1st light detection part or the light intensity of the 2nd light detection part will be. In an environment having a light intensity corresponding to a predetermined brightness, natural light and artificial light can be identified by the ratio of the measurement value of the second light detection unit to the measurement value of the first light detection unit.
前記第２の光検知部は波長５２５ｎｍ〜５６５ｎｍの波長域の可視光強度を測定することが好適である。こうすれば、第１の光検知部の測定値に対して第２の光検知部の測定値が相対的に大きいときは人工光による照明の明るさであると判定することができる。 It is preferable that the second light detection unit measures visible light intensity in a wavelength range of 525 nm to 565 nm. If it carries out like this, when the measured value of a 2nd light detection part is relatively large with respect to the measured value of a 1st light detection part, it can determine with it being the brightness of the illumination by artificial light.
特定の波長の光強度を測定する第１の光検知部及び第２の光検知部並びに第３の光検知部と、前記第１の光検知部の測定値及び前記第２の光検知部の測定値並びに前記第３の光検知部の測定値を比較して自然光と人工光とを識別する判断部と、を備えた光源識別装置の光源識別方法であって、前記第１の光検知部で測定される波長４８０ｎｍ〜５２０ｎｍの波長域の可視光強度の測定値と、前記第２の光検知部で測定される波長５２５ｎｍ〜５６５ｎｍの波長域の可視光強度の測定値と、前記第２の光検知部で測定される波長域よりも長波長の可視光強度が測定される前記第３の光検知部の測定値と、を取得するステップと、前記第１の光検知部の測定値に対する前記第２の光検知部の測定値の比率が第１の閾値以下であるかを判定するステップと、前記第１の光検知部の測定値または前記第２の光検知部の測定値に対する前記第３の光検知部の測定値の比率が第２の閾値以上であるかを判定するステップと、を有することが好ましい。 A first light detection unit, a second light detection unit, a third light detection unit, a measurement value of the first light detection unit, and a second light detection unit that measure the light intensity of a specific wavelength; A light source identification method for a light source identification device, comprising: a determination unit that compares a measurement value and a measurement value of the third light detection unit to identify natural light and artificial light, wherein the first light detection unit The measurement value of the visible light intensity in the wavelength range of 480 nm to 520 nm, the measurement value of the visible light intensity in the wavelength range of 525 nm to 565 nm measured by the second light detection unit, and the second Obtaining a measurement value of the third light detection unit in which visible light intensity having a wavelength longer than the wavelength range measured by the light detection unit is measured, and a measurement value of the first light detection unit The step of determining whether the ratio of the measured value of the second light detection unit to the first threshold is less than or equal to the first threshold value And determining whether the ratio of the measurement value of the first light detection unit or the measurement value of the third light detection unit to the measurement value of the second light detection unit is equal to or greater than a second threshold value. It is preferable to have.
こうすれば、第１の光検知部の光強度または第２の光検知部の光強度が所定の明るさに対応する光強度を有する環境下において、第１の光検知部の測定値に対する第２の光検知部の測定値の比率が第１の閾値以下であっても、第３の光検知部の測定値も使うことによって、自然光と人工光とを正確に識別できる。 In this way, in an environment where the light intensity of the first light detection unit or the light intensity of the second light detection unit has a light intensity corresponding to a predetermined brightness, the first measurement value for the measurement value of the first light detection unit is obtained. Even if the ratio of the measurement values of the second light detection unit is equal to or less than the first threshold value, natural light and artificial light can be accurately identified by using the measurement value of the third light detection unit.
前記第３の光検知部は波長７００ｎｍ〜７５０ｎｍの波長域の可視光強度を測定することが好適である。こうすれば、第１の光検知部の測定値に対する第２の光検知部の測定値の比率が第１の閾値以下であって、第２の光検知部の測定値に対して第３の光検知部の測定値が相対的に大きいときは自然光であると判定することができる。 It is preferable that the third light detection unit measures visible light intensity in a wavelength range of 700 nm to 750 nm. In this case, the ratio of the measurement value of the second light detection unit to the measurement value of the first light detection unit is equal to or less than the first threshold value, and the third measurement value is equal to the third measurement value of the second light detection unit. When the measurement value of the light detection unit is relatively large, it can be determined that the light is natural light.
本発明によれば、窓ガラスを通して紫外光が減衰した自然光であっても、室内照明による人工光との差異を判別することが可能であり、人工光と自然光とを識別できる。 According to the present invention, even if natural light is attenuated by ultraviolet light through a window glass, it is possible to distinguish a difference from artificial light caused by indoor lighting, and artificial light and natural light can be distinguished.
＜第１の実施形態＞
図１は本発明の第１の実施形態の光源識別装置１の概略構成を示すブロック図である。なお、光源識別装置とは、光源を識別する専用機器だけでなく、光源を識別することにより何らかの機能が付加された機器を含み、具体的には照明設備や空調設備に組み込まれたユニット等を含む。
<First Embodiment>
FIG. 1 is a block diagram showing a schematic configuration of a light source identification device 1 according to a first embodiment of the present invention. The light source identification device includes not only a dedicated device for identifying a light source but also a device to which a certain function is added by identifying the light source, specifically a unit incorporated in a lighting facility or an air conditioning facility. Including.
図２に、本実施形態で使用する複数の光検知部１０が備えられた光センサ３０の斜視図を示す。図３に、複数の光検知部１０が備えられた光センサ３０の回路ブロック図を示す。また、図４には、本実施形態で使用する第１の光検知部１１に設けられた第１の波長制限フィルタ２１の透過率と、第２の光検知部１２に設けられた第２の波長制限フィルタ２２の透過率とを示す。 FIG. 2 is a perspective view of an optical sensor 30 provided with a plurality of optical detection units 10 used in the present embodiment. FIG. 3 shows a circuit block diagram of an optical sensor 30 provided with a plurality of light detection units 10. Further, in FIG. 4, the transmittance of the first wavelength limiting filter 21 provided in the first light detection unit 11 used in the present embodiment and the second value provided in the second light detection unit 12 are illustrated. The transmittance of the wavelength limiting filter 22 is shown.
図１〜図４を参照して、本実施形態での光源識別装置１について詳述する。第１の光検知部１１は第１の波長制限フィルタ２１を透過した光を検知して、受光強度に応じた出力に変換する。第１の光検知部１１の出力は、たとえばフォトダイオードの電流出力であり、電流電圧変換によって電圧出力に変更したり、ＡＤ変換回路によってデジタル信号出力に変更されたりといったコンディショナー回路１６を介して任意の出力形式に変更されて、判断部４０に入力される。図３に示した回路ブロック図はデジタル信号を出力するコンディショナー回路１６の一例である。同様に、第２の光検知部１２は第２の波長制限フィルタ２２を透過した光を検知して、受光強度に応じた出力に変換する。第２の光検知部１２の出力もまた、同様の処理を経て判断部４０に入力される。コンディショナー回路１６は、それぞれの光検知部の出力を切り替えて入力するマルチプレクサ回路を有する。 With reference to FIGS. 1-4, the light source identification device 1 in this embodiment is explained in full detail. The first light detection unit 11 detects the light transmitted through the first wavelength limiting filter 21 and converts it into an output corresponding to the received light intensity. The output of the first light detection unit 11 is, for example, a current output of a photodiode, which is arbitrarily changed via a conditioner circuit 16 such as a voltage output by current-voltage conversion or a digital signal output by an AD conversion circuit. Is output to the determination unit 40. The circuit block diagram shown in FIG. 3 is an example of the conditioner circuit 16 that outputs a digital signal. Similarly, the second light detection unit 12 detects the light transmitted through the second wavelength limiting filter 22 and converts it into an output corresponding to the received light intensity. The output of the second light detection unit 12 is also input to the determination unit 40 through the same processing. The conditioner circuit 16 has a multiplexer circuit that switches and inputs the outputs of the respective light detection units.
図１及び図２に示すように、光センサ３０は、第１の波長制限フィルタ２１が設けられた第１の光検知部１１と、第２の波長制限フィルタ２２が設けられた第２の光検知部１２と、コンディショナー回路１６と、が、パッケージ基板７０に配置されてパッケージ樹脂７５に封止されて一体化された構造であることが好ましい。 As shown in FIGS. 1 and 2, the optical sensor 30 includes a first light detection unit 11 provided with a first wavelength limiting filter 21 and a second light provided with a second wavelength limiting filter 22. The detection unit 12 and the conditioner circuit 16 are preferably arranged on the package substrate 70 and sealed and integrated with the package resin 75.
図１に示す判断部４０では、第１の光検知部１１の出力と第２の光検知部１２の出力とから得られた測定値を用いて、自然光と人工光とを識別して、人工光の識別信号または自然光の識別信号を出力する。このときの、自然光と人工光との光源識別装置１について、以下に詳述する。 In the determination unit 40 shown in FIG. 1, natural light and artificial light are identified by using measured values obtained from the output of the first light detection unit 11 and the output of the second light detection unit 12. A light identification signal or a natural light identification signal is output. The light source identification device 1 for natural light and artificial light at this time will be described in detail below.
本実施形態での光源識別装置１は、自然光と各種の人工光との光源スペクトルを比較検討するとともに、必要になる波長制限フィルタを製作することによって実現された。 The light source identification device 1 in the present embodiment is realized by comparing and examining the light source spectrums of natural light and various artificial lights and manufacturing a necessary wavelength limiting filter.
図９は地表で測定したときの太陽光スペクトルである。地球上の大気成分による吸収の影響を受けても、波長３００ｎｍ付近の紫外光から、可視光の５００ｎｍ付近をピークに、赤外光に亘る広い波長分布を有している。通常、可視光の波長域は４００ｎｍ付近〜８００ｎｍ付近とされており、本明細書では波長４００ｎｍ以下を紫外光、波長８００ｎｍ以上を赤外光として、可視光を４００ｎｍ〜８００ｎｍの範囲内とする。 FIG. 9 is a sunlight spectrum when measured on the ground surface. Even under the influence of absorption by atmospheric components on the earth, it has a wide wavelength distribution ranging from ultraviolet light having a wavelength of around 300 nm to infrared light with a peak at around 500 nm of visible light. Usually, the wavelength range of visible light is about 400 nm to about 800 nm. In this specification, the wavelength of 400 nm or less is ultraviolet light, the wavelength of 800 nm or more is infrared light, and the visible light is in the range of 400 nm to 800 nm.
一方、代表的な人工光の発光スペクトルを図１０〜図１２に示す。図１０に示すハロゲンランプは可視光領域の短波長側から赤外領域にかけて発光スペクトルを有し、発光のピーク波長は８００ｎｍより長波長の赤外光の波長域である。可視光領域では短波長光の相対強度が小さい。 On the other hand, the emission spectrum of typical artificial light is shown in FIGS. The halogen lamp shown in FIG. 10 has an emission spectrum from the short wavelength side of the visible light region to the infrared region, and the peak wavelength of light emission is the wavelength region of infrared light longer than 800 nm. In the visible light region, the relative intensity of short wavelength light is small.
図１１に示す蛍光灯は、より発光スペクトルが狭い波長域にあり、特徴的には水銀の発光スペクトルが強く現れている。発光波長は４００ｎｍ〜７００ｎｍにあり、水銀の発光波長を除くと、６００ｎｍ付近にピークを有している。波長７００ｎｍ以上の発光スペクトルは僅かな強度である。 The fluorescent lamp shown in FIG. 11 has a light emission spectrum in a narrower wavelength range, and characteristically, the emission spectrum of mercury appears strongly. The emission wavelength is in the range of 400 nm to 700 nm, and has a peak near 600 nm excluding the emission wavelength of mercury. An emission spectrum having a wavelength of 700 nm or more has a slight intensity.
白色ＬＥＤ照明として普及しているタイプのＬＥＤランプは、図１２に示すように、可視光領域に２つのピーク波長を有している。波長４５０ｎｍ付近のピークは青色の高輝度発光ダイオードの発光波長であり、波長６００ｎｍ付近のブロードなピークは蛍光体の発光によるものである。この発光スペクトルは白色に視認され、比較的演色性が良いとされている。また、蛍光灯と同様に、白色ＬＥＤにおいても、波長７００ｎｍ以上の発光スペクトルは僅かな強度である。 As shown in FIG. 12, the type of LED lamp that is widely used as white LED illumination has two peak wavelengths in the visible light region. The peak near the wavelength of 450 nm is the emission wavelength of the blue high-intensity light emitting diode, and the broad peak near the wavelength of 600 nm is due to the emission of the phosphor. This emission spectrum is visually recognized as white, and is relatively good in color rendering. Similarly to a fluorescent lamp, a white LED has a slight intensity of an emission spectrum having a wavelength of 700 nm or more.
本実施形態では、自然光と人工光との特徴的な差異として、可視光領域の波長５００ｎｍ付近と、５５０ｎｍ付近での強度に着目した。太陽光では、図９に示すように、５００ｎｍ付近をピークとして、５５０ｎｍの強度は相対的に弱くなっている。一方、図１０や図１１に示すように、人工光であるハロゲンランプや蛍光灯では５５０ｎｍのほうが５００ｎｍよりも強度が強い。図１２に示すように、典型的な白色ＬＥＤランプでは、５００ｎｍ付近が２つのピークの谷になっていて、５５０ｎｍ付近の強度に比べて弱い。 In the present embodiment, attention is focused on the intensity around the wavelength of 500 nm and around 550 nm in the visible light region as a characteristic difference between natural light and artificial light. In sunlight, as shown in FIG. 9, the intensity at 550 nm is relatively weak with a peak at around 500 nm. On the other hand, as shown in FIGS. 10 and 11, the intensity of 550 nm is higher than that of 500 nm in the halogen lamp and fluorescent lamp which are artificial lights. As shown in FIG. 12, in a typical white LED lamp, the vicinity of 500 nm is a valley of two peaks, which is weaker than the intensity near 550 nm.
そこで、図４に示すように、第１の波長制限フィルタ２１として、波長４８０ｎｍ〜５２０ｎｍの波長域の可視光を透過する光学フィルタが製作された。また、第２の波長制限フィルタ２２として、波長５２５ｎｍ〜５６５ｎｍの波長域の可視光を透過する光学フィルタが製作された。これらの光学フィルタは、石英ガラス基板の一方の面にＳｉＯ２膜とＴａ２Ｏ５膜とを所望の膜厚で多層に積層することによって得られた。第１の波長制限フィルタ２１が第１の光検知部１１に設けられ、第２の波長制限フィルタ２２が第２の光検知部１２に設けられた。なお、他の波長域（たとえば、１０００ｎｍ以上）の透過を抑制する光学フィルタを同時に備えておくことが好ましい。たとえば、石英ガラスの他方の面に赤外光を反射する材料を成膜することができる。 Therefore, as shown in FIG. 4, an optical filter that transmits visible light in the wavelength range of 480 nm to 520 nm was manufactured as the first wavelength limiting filter 21. Further, as the second wavelength limiting filter 22, an optical filter that transmits visible light in the wavelength range of 525 nm to 565 nm was manufactured. These optical filters were obtained by laminating a SiO 2 film and a Ta 2 O 5 film in a desired thickness on one surface of a quartz glass substrate. The first wavelength limiting filter 21 is provided in the first light detection unit 11, and the second wavelength limiting filter 22 is provided in the second light detection unit 12. It is preferable that an optical filter that suppresses transmission in other wavelength regions (for example, 1000 nm or more) is provided at the same time. For example, a material that reflects infrared light can be formed on the other surface of quartz glass.
図５に、第１の実施形態における光源識別のフローチャートを示す。測定が開始されると、ステップＳＴ１で、第１の光検知部１１の測定値及び第２の光検知部１２の測定値が得られる。ステップＳＴ２では、第２の光検知部１２の測定値が判定を必要とする有意な値であるかどうかを、閾値Ａと比較する。ここで、閾値Ａは人工照明の点灯を必要とする照度環境下で得られる第２の光検知部１２の測定値にほぼ合わせた設定値である。第２の光検知部１２の測定値が閾値Ａより大きければ、ステップＳＴ３に進み、そうでない場合は以下のフローを中止して、次の測定開始まで待機する。なお、第２の光検知部１２の測定値の替わりに、第１の光検知部１１の測定値を用いてもよいが、人工照明の点灯を必要とする照度の測定には第２の光検知部１２の測定値のほうが適している。 FIG. 5 shows a flowchart of light source identification in the first embodiment. When measurement is started, the measurement value of the first light detection unit 11 and the measurement value of the second light detection unit 12 are obtained in step ST1. In step ST2, whether or not the measured value of the second light detection unit 12 is a significant value that needs to be determined is compared with a threshold value A. Here, the threshold value A is a set value substantially matched with the measurement value of the second light detection unit 12 obtained in an illuminance environment that requires lighting of artificial illumination. If the measurement value of the second light detection unit 12 is greater than the threshold value A, the process proceeds to step ST3. Otherwise, the following flow is stopped and the process waits until the next measurement starts. Note that the measurement value of the first light detection unit 11 may be used instead of the measurement value of the second light detection unit 12, but the second light is used for the measurement of illuminance that requires lighting of the artificial illumination. The measurement value of the detection unit 12 is more suitable.
ステップＳＴ３では、第２の光検知部１２の出力測定値を第１の光検知部１１の測定値で割る演算をおこない、演算値Ｘを得る。ステップＳＴ４で、演算値Ｘが閾値Ｂ以上であるかを判定する。ここで、閾値Ｂは自然光の環境下で得られる演算値Ｘの値より大きな設定値である。演算値Ｘが閾値Ｂ以上である場合は、ステップＳＴ５に進み、人工光の識別信号を出力する。一方、演算値Ｘが閾値Ｂよりも小さければ、ステップＳＴ６に進み、自然光の識別信号を出力する。 In step ST3, a calculation value X is obtained by dividing the output measurement value of the second light detection unit 12 by the measurement value of the first light detection unit 11. In step ST4, it is determined whether the calculated value X is greater than or equal to the threshold value B. Here, the threshold value B is a set value that is larger than the value of the calculation value X obtained in an environment of natural light. If the calculated value X is greater than or equal to the threshold value B, the process proceeds to step ST5, and an artificial light identification signal is output. On the other hand, if the calculated value X is smaller than the threshold value B, the process proceeds to step ST6, and a natural light identification signal is output.
こうすれば、第１の光検知部１１と第２の光検知部１２との特定波長域の光強度を測定して、第１の光検知部１１の光強度または第２の光検知部１２の光強度が所定の明るさに対応する光強度を有する環境下において、第１の光検知部１１の測定値に対する第２の光検知部１２の測定値の比率が自然光に比べて相対的に大きいときは、人工光による照明の明るさであると判定することができる。また、第１の光検知部１１の測定値に対する第２の光検知部１２の測定値の比率が自然光に比べて同程度であるときは自然光による明るさであると判定する。 If it carries out like this, the light intensity of the specific wavelength range of the 1st light detection part 11 and the 2nd light detection part 12 will be measured, and the light intensity of the 1st light detection part 11 or the 2nd light detection part 12 will be measured. The ratio of the measurement value of the second light detection unit 12 to the measurement value of the first light detection unit 11 is relatively smaller than that of natural light in an environment where the light intensity of the second light has a light intensity corresponding to a predetermined brightness. When it is large, it can be determined that the brightness of the illumination by artificial light. When the ratio of the measurement value of the second light detection unit 12 to the measurement value of the first light detection unit 11 is approximately the same as that of natural light, it is determined that the brightness is due to natural light.
識別信号は所定の電圧による２値信号、たとえば人工光に対してＨｉｇｈ電圧、自然光に対してＬｏ電圧を出力する。また、電圧を出力するのでなく、接点のオープン、ショートによる信号であってもよいし、その他の出力手段（光、磁気、等）であってもよい。出力先の構成に合わせて判断部４０の出力手段を構成すればよい。 The identification signal is a binary signal with a predetermined voltage, such as a high voltage for artificial light and a Lo voltage for natural light. Further, instead of outputting a voltage, it may be a signal generated by opening or shorting a contact, or other output means (light, magnetism, etc.). What is necessary is just to comprise the output means of the judgment part 40 according to the structure of an output destination.
このようにして、第１の波長制限フィルタ２１の波長域に対して、第２の波長制限フィルタ２２の波長域での光強度を相対比較して、自然光で期待される比較値に対して第２の波長制限フィルタ２２の波長域での光強度が大きければ、人工光であると判定できる。このとき、第１の波長制限フィルタ２１の波長域に対して、第２の波長制限フィルタ２２の波長域で光強度が大きいかどうかを、測定値の比率で判定すれば、自然光と人工光とを識別することが容易である。また、４００ｎｍ以上の可視光によって、自然光と人工光とを識別できることが好ましい。こうすれば、窓ガラスを通して紫外光が減衰した自然光であっても、室内照明による人工光との差異を判別することが可能であり、人工光と自然光とを識別できる。 In this manner, the light intensity in the wavelength region of the second wavelength limiting filter 22 is relatively compared with the wavelength region of the first wavelength limiting filter 21, and the comparison value expected for natural light is If the light intensity in the wavelength region of the second wavelength limiting filter 22 is large, it can be determined that the light is artificial light. At this time, if it is determined by the ratio of the measured values whether the light intensity is large in the wavelength region of the second wavelength limiting filter 22 relative to the wavelength region of the first wavelength limiting filter 21, natural light and artificial light Is easy to identify. Moreover, it is preferable that natural light and artificial light can be distinguished by visible light of 400 nm or more. In this way, even if the natural light is attenuated by ultraviolet light through the window glass, it is possible to discriminate the difference from the artificial light caused by indoor lighting, and the artificial light and natural light can be distinguished.
このように可視光を検出できる光検知部であればよいので、一般的な半導体材料で構成されたフォトダイオードを用いることができる。たとえば、一般的なシリコン・フォトダイオードであれば、可視光〜近赤外光の波長範囲に感度をもつので、本実施形態の光源識別装置１への適用が容易である。また、本実施形態の光源識別装置１は紫外光を検出しなくてよいので、高精度の紫外線センサが不要である。したがって、その分、低コスト化が可能である。 Since the light detection unit can detect visible light in this way, a photodiode made of a general semiconductor material can be used. For example, since a general silicon photodiode has sensitivity in the wavelength range of visible light to near infrared light, it can be easily applied to the light source identification device 1 of the present embodiment. Moreover, since the light source identification device 1 of this embodiment does not need to detect ultraviolet light, a highly accurate ultraviolet sensor is unnecessary. Therefore, the cost can be reduced accordingly.
第１の波長制限フィルタ２１として、波長４８０ｎｍ〜５２０ｎｍの波長域の可視光を透過する光学フィルタを用いたが、より狭い波長域（たとえば４９０ｎｍ〜５１０ｎｍ）の光学フィルタであってもよい。波長域が狭いほうが第１の光検知部１１の光強度が減少して、その出力が小さくなるが、ノイズに比べて十分な出力が得られていれば不具合を生じることはない。波長５００ｎｍ付近が自然光と典型的な人工光とのスペクトルに差異がある波長域なので、その波長域の光学フィルタであれば効果を奏する。透過する波長域がより広い設計の光学フィルタを適用する場合は、上述の差異が得られるように慎重に選定すればよい。 As the first wavelength limiting filter 21, an optical filter that transmits visible light in a wavelength range of 480 nm to 520 nm is used. However, an optical filter in a narrower wavelength range (for example, 490 nm to 510 nm) may be used. As the wavelength range is narrower, the light intensity of the first light detection unit 11 decreases and the output becomes smaller. However, if a sufficient output is obtained compared to noise, there is no problem. Since the wavelength region near the wavelength of 500 nm has a difference in spectrum between natural light and typical artificial light, an optical filter in that wavelength region is effective. When an optical filter having a wider transmission wavelength range is applied, it may be selected carefully so as to obtain the above difference.
本実施形態において、第２の光検知部１２は、波長５２５ｎｍ〜５６５ｎｍの波長域の可視光を検出したが、波長５８５ｎｍ〜６２５ｎｍの波長域の可視光を検出するようにしてもよい。これには、第２の波長制限フィルタ２２として、波長５８５ｎｍ〜６２５ｎｍの波長域の可視光を透過する光学フィルタを用いればよい。この波長域を選んでも、第１の光検知部１１の測定値に対する第２の光検知部１２の測定値の比率が自然光に比べて相対的に大きいときは人工光による照明の明るさであると判定することができる。また、それぞれの場合において、波長域がより狭い（たとえば５３０ｎｍ〜５６０ｎｍの）光学フィルタやより広い（たとえば５２０ｎｍ〜５７０ｎｍの）光学フィルタであっても、閾値Ａ、閾値Ｂを適切に設定すれば本発明を適用できる。 In the present embodiment, the second light detection unit 12 detects visible light in the wavelength range of 525 nm to 565 nm, but may detect visible light in the wavelength range of 585 nm to 625 nm. For this purpose, an optical filter that transmits visible light in the wavelength range of 585 nm to 625 nm may be used as the second wavelength limiting filter 22. Even if this wavelength range is selected, if the ratio of the measurement value of the second light detection unit 12 to the measurement value of the first light detection unit 11 is relatively larger than natural light, the brightness of the illumination by artificial light is obtained. Can be determined. Further, in each case, even if the wavelength filter is narrower (for example, 530 nm to 560 nm) or wider (for example, 520 nm to 570 nm), the threshold A and the threshold B can be set appropriately. The invention can be applied.
なお、ビルや家屋内の冷暖房効率をさらに高めるために、窓ガラスに赤外光の反射率が高い材料を複合化するようになってきている。このため、自然光と人工光とを識別するためには８００ｎｍ以上の赤外光も使用しない識別方法であることが好ましい。本実施形態に示すように、可視光の波長域だけを使用する識別方法であれば、紫外光も赤外光も使用しないので、好適である。 In addition, in order to further improve the cooling and heating efficiency of buildings and houses, a material having high infrared light reflectivity has been combined with the window glass. For this reason, in order to distinguish between natural light and artificial light, an identification method that does not use infrared light of 800 nm or more is preferable. As shown in this embodiment, any identification method that uses only the visible light wavelength range is preferable because neither ultraviolet light nor infrared light is used.
演算値Ｘは逆数であってもよい。その場合はステップＳＴ１４の判定基準を変更すればよい。また、測定値の絶対値が大きく変動しない場合には、割り算の替わりに、引き算の演算式を用いてもよい。 The calculated value X may be an inverse number. In that case, what is necessary is just to change the criterion of step ST14. In addition, when the absolute value of the measured value does not vary greatly, a subtraction arithmetic expression may be used instead of division.
図６に第１の実施形態の変形例のフローチャートを示す。この場合は、人工光または自然光が有意な光強度で検知されていることが前提となっている。したがって、図５におけるステップＳＴ２が省略されている。たとえば、照度センサを有するシステムにおいては、有意な照度が得られている環境下で、人工光と自然光との識別をおこなうように用いられる。 FIG. 6 shows a flowchart of a modification of the first embodiment. In this case, it is assumed that artificial light or natural light is detected with a significant light intensity. Therefore, step ST2 in FIG. 5 is omitted. For example, a system having an illuminance sensor is used to distinguish between artificial light and natural light in an environment where significant illuminance is obtained.
＜第２の実施形態＞
図７は本発明の第２の実施形態の光源識別装置２の概略構成を示すブロック図である。光センサ３１において、複数の光検知部１５は、第３の波長制限フィルタ２３を設けた第３の光検知部１３を有している。その他の光源識別装置２の構成は第１の実施形態と同様であり、同符号を用いた。
<Second Embodiment>
FIG. 7 is a block diagram showing a schematic configuration of the light source identification device 2 according to the second embodiment of the present invention. In the optical sensor 31, the plurality of light detection units 15 have a third light detection unit 13 provided with a third wavelength limiting filter 23. Other configurations of the light source identification device 2 are the same as those in the first embodiment, and the same reference numerals are used.
第３の波長制限フィルタ２３は波長７００ｎｍ〜７５０ｎｍの波長域の可視光を透過する光学フィルタであり、第１の波長制限フィルタ２１及び第２の波長制限フィルタ２２と同様に製作された。 The third wavelength limiting filter 23 is an optical filter that transmits visible light in the wavelength range of 700 nm to 750 nm, and was manufactured in the same manner as the first wavelength limiting filter 21 and the second wavelength limiting filter 22.
判断部４０は、第１の光検知部１１の測定値に対して第２の光検知部１２の測定値の比率が第１の閾値以下であるとともに、第２の光検知部１２の測定値に対して第３の光検知部１３の測定値の比率が第２の閾値以上であるときに、自然光として判定した識別信号を出力することが好ましい。こうすれば、第１の波長制限フィルタ２１の波長域に対して、第２の波長制限フィルタ２２の波長域で光強度があまり大きくないような特殊な照明光の環境下においても、第３の波長制限フィルタ２３の波長域での光強度が大きくなければ自然光が入射していない状況であることが判定できる。したがって、第３の光検知部１３の測定値も使うことによって、自然光と人工光とを正確に識別できる。 The determination unit 40 is configured such that the ratio of the measurement value of the second light detection unit 12 to the measurement value of the first light detection unit 11 is equal to or less than the first threshold value, and the measurement value of the second light detection unit 12 On the other hand, it is preferable to output the identification signal determined as natural light when the ratio of the measurement values of the third light detection unit 13 is equal to or greater than the second threshold value. In this case, the third wavelength can be changed even in a special illumination light environment in which the light intensity is not so large in the wavelength region of the second wavelength limiting filter 22 relative to the wavelength region of the first wavelength limiting filter 21. If the light intensity in the wavelength region of the wavelength limiting filter 23 is not large, it can be determined that natural light is not incident. Therefore, natural light and artificial light can be accurately identified by using the measurement value of the third light detector 13.
図８に、第２の実施形態における光源識別のフローチャートを示す。測定が開始されると、ステップＳＴ１１で、第１の光検知部１１の測定値及び第２の光検知部１２の測定値が得られる。 FIG. 8 shows a flowchart of light source identification in the second embodiment. When measurement is started, the measurement value of the first light detection unit 11 and the measurement value of the second light detection unit 12 are obtained in step ST11.
ステップＳＴ１３では、第２の光検知部１２の測定値を第１の光検知部１１の測定値で割る演算をおこない、演算値Ｘを得る。ステップＳＴ１４で、演算値Ｘが閾値Ｂよりも大きいかを判定する。ここで、閾値Ｂは自然光の環境下で得られる演算値Ｘの値にほぼ合わせた設定値である。演算値Ｘが閾値Ｂよりも大きい場合は、ステップＳＴ１５に進み、人工光の識別信号を出力する。 In step ST13, the calculation value X is obtained by dividing the measurement value of the second light detection unit 12 by the measurement value of the first light detection unit 11. In step ST14, it is determined whether the calculated value X is larger than the threshold value B. Here, the threshold value B is a set value that is substantially matched with the value of the calculation value X obtained in an environment of natural light. When the calculated value X is larger than the threshold value B, the process proceeds to step ST15, and an artificial light identification signal is output.
一方、演算値Ｘが閾値Ｂ以下であれば、ステップＳＴ１６に進み、第３の光検知部１３の測定値を第２の光検知部１２の測定値で割る演算をおこない、演算値Ｙを得る。ステップＳＴ１７で、演算値Ｙが閾値Ｃ以上であるかを判定する。ここで、閾値Ｃは自然光の環境下で得られる演算値Ｙの値よりも少し小さい設定値である。演算値Ｙが閾値Ｃ以上である場合は、ステップＳＴ１８に進み、自然光の識別信号を出力する。一方、演算値Ｙが閾値Ｃよりも小さければ、ステップＳＴ１５に進み、人工光の識別信号を出力する。 On the other hand, if the calculated value X is less than or equal to the threshold value B, the process proceeds to step ST16, where the calculated value of the third light detecting unit 13 is divided by the measured value of the second light detecting unit 12 to obtain the calculated value Y. . In step ST17, it is determined whether the calculated value Y is greater than or equal to the threshold value C. Here, the threshold value C is a setting value that is slightly smaller than the value of the calculation value Y obtained in an environment of natural light. If the calculated value Y is greater than or equal to the threshold value C, the process proceeds to step ST18, and a natural light identification signal is output. On the other hand, if the calculated value Y is smaller than the threshold value C, the process proceeds to step ST15, and an artificial light identification signal is output.
図１０に示すようなハロゲンランプ等の赤外光強度が強い人工照明は、第１の光検知部１１と第２の光検知部１２との測定値を比較して識別できる。さらに、自然光の波長スペクトルに近い人工照明は、図１１や図１２に示すように、第３の光検知部１３での光強度が大きくないので、第３の光検知部１３での光強度が大きければ自然光が入射している状況であることが識別できる。これにより、本実施形態では、第１の光検知部１１の測定値に対する第２の光検知部１２の測定値の比率が第１の閾値（閾値Ｂ）以下であっても、人工光と自然光との光源識別を誤判定することがない。 Artificial illumination with high infrared light intensity such as a halogen lamp as shown in FIG. 10 can be identified by comparing measured values of the first light detection unit 11 and the second light detection unit 12. Further, as shown in FIG. 11 and FIG. 12, the artificial illumination close to the wavelength spectrum of natural light has a low light intensity at the third light detection unit 13, so that the light intensity at the third light detection unit 13 is low. If it is larger, it can be identified that natural light is incident. Thereby, in this embodiment, even if the ratio of the measurement value of the 2nd light detection part 12 with respect to the measurement value of the 1st light detection part 11 is below a 1st threshold value (threshold B), artificial light and natural light The light source identification is not erroneously determined.
第３の波長制限フィルタ２３は波長７００ｎｍ〜７５０ｎｍの波長域の可視光を透過する光学フィルタであるが、第３の波長制限フィルタ２３の波長域は適宜選定することができる。たとえば、６５０ｎｍ〜７５０ｎｍの波長域の可視光を透過する光学フィルタや、７００ｎｍ〜７５０ｎｍの波長域の可視光を透過する光学フィルタであってもよい。これらの波長域における人間の比視感度が低いことから、人工照明の発光波長として重視されておらず、図１１や図１２に示すような人工照明における相対強度が小さい。 The third wavelength limiting filter 23 is an optical filter that transmits visible light in a wavelength range of 700 nm to 750 nm, but the wavelength range of the third wavelength limiting filter 23 can be appropriately selected. For example, an optical filter that transmits visible light in a wavelength range of 650 nm to 750 nm or an optical filter that transmits visible light in a wavelength range of 700 nm to 750 nm may be used. Since the human's relative visibility in these wavelength ranges is low, it is not considered as an emission wavelength of artificial illumination, and the relative intensity in artificial illumination as shown in FIGS. 11 and 12 is small.
なお、図８のステップＳＴ１６では、演算値Ｙとして、第３の光検知部１３の測定値を第２の光検知部１２の測定値で割る演算をおこなったが、第３の光検知部１３の測定値を第１の光検知部１１の測定値で割る演算を用いてもよい。ステップＳＴ１４によって、第１の光検知部１１の測定値が小さい場合の識別がなされているので、ステップＳＴ１６では第１の光検知部１１の測定値と第２の光検知部１２の測定値との、いずれの測定値を用いても誤判定しない。しかしながら、第１の光検知部１１の測定値が小さくても演算値Ｘが閾値Ｂ以下になるような閾値Ｂの値に設定するときは、自然光、人工光のいずれでも光強度が大きい第２の光検知部１２の測定値を用いればよい。 8, the calculation value Y is calculated by dividing the measurement value of the third light detection unit 13 by the measurement value of the second light detection unit 12, but the third light detection unit 13 The calculation of dividing the measured value by the measured value of the first light detection unit 11 may be used. Since the identification when the measurement value of the first light detection unit 11 is small is made in step ST14, the measurement value of the first light detection unit 11 and the measurement value of the second light detection unit 12 are determined in step ST16. Whichever measurement value is used, no erroneous determination is made. However, when the threshold value B is set such that the calculated value X is less than or equal to the threshold value B even if the measurement value of the first light detection unit 11 is small, the second light intensity is high for both natural light and artificial light. The measured value of the light detection unit 12 may be used.
第２の実施形態においても、演算式は上記に限らず、実施形態の変形が可能である。また、図５に示すステップＳＴ２と同じ内容のステップＳＴ１２を、ステップＳＴ１３の前に挿入してもよい。ステップＳＴ１２をおこなうことによって、第１の光検知部１１の測定値と第２の光検知部１２の測定値とが小さい場合は、光源の識別をおこなわずに終了させることができる。 Also in the second embodiment, the arithmetic expression is not limited to the above, and the embodiment can be modified. Further, step ST12 having the same contents as step ST2 shown in FIG. 5 may be inserted before step ST13. By performing step ST12, when the measurement value of the first light detection unit 11 and the measurement value of the second light detection unit 12 are small, the process can be terminated without identifying the light source.
本実施形態においても、複数の光検知部１５とコンディショナー回路１６とを有する光センサ３１が一体化されたパッケージ構造であることが好ましい。しかし、第１の実施形態及び第２の実施形態において、光検知部が１個の光センサを各選択波長ごとに用意して、複数の光センサによって複数の光検知部を構成できることは言うまでもない。また、コンディショナー回路１６を内蔵していない光センサも適用可能である。 Also in the present embodiment, it is preferable to have a package structure in which an optical sensor 31 having a plurality of light detection units 15 and a conditioner circuit 16 is integrated. However, in the first embodiment and the second embodiment, it goes without saying that the light detection unit can prepare one light sensor for each selected wavelength, and a plurality of light detection units can be configured by a plurality of light sensors. . An optical sensor that does not include the conditioner circuit 16 is also applicable.
１、２ 光源識別装置
１０、１５ 複数の光検知部
１１ 第１の光検知部
１２ 第２の光検知部
１３ 第３の光検知部
１６ コンディショナー回路
２１ 第１の波長制限フィルタ
２２ 第２の波長制限フィルタ
２３ 第３の波長制限フィルタ
３０、３１ 光センサ
４０ 判断部
DESCRIPTION OF SYMBOLS 1, 2 Light source identification device 10, 15 Several light detection part 11 1st light detection part 12 2nd light detection part 13 3rd light detection part 16 Conditioner circuit 21 1st wavelength limiting filter 22 2nd wavelength Limiting filter 23 Third wavelength limiting filter 30, 31 Optical sensor 40 Determination unit
Claims (9)
前記複数の光検知部の測定値を比較して自然光と人工光とを識別する判断部と、
を備えた光源識別装置であって、
前記複数の光検知部は、透過する可視光の波長を制限する第１の波長制限フィルタを設けた第１の光検知部と、前記第１の波長制限フィルタよりも長波長の可視光を透過する第２の波長制限フィルタを設けた第２の光検知部と、を少なくとも有し、
前記第１の波長制限フィルタは波長４８０ｎｍ〜５２０ｎｍの波長域の可視光を透過する光学フィルタであることを特徴とする光源識別装置。 A plurality of light detectors for measuring the light intensity in a specific wavelength range;
A determination unit for comparing natural light and artificial light by comparing measurement values of the plurality of light detection units;
A light source identification device comprising:
The plurality of light detection units transmit a first light detection unit provided with a first wavelength limiting filter that limits a wavelength of visible light to be transmitted, and visible light having a wavelength longer than that of the first wavelength limiting filter. A second photodetecting unit provided with a second wavelength limiting filter that performs,
The light source identification device, wherein the first wavelength limiting filter is an optical filter that transmits visible light in a wavelength range of 480 nm to 520 nm.
前記判断部は、前記第１の光検知部の測定値に対して前記第２の光検知部の測定値の比率が第１の閾値以下であるとともに、前記第１の光検知部の測定値または前記第２の光検知部の測定値に対して前記第３の光検知部の測定値の比率が第２の閾値以上であるときに、自然光として判定した識別信号を出力することを特徴とする請求項２に記載の光源識別装置。 The plurality of light detection units include a third light detection unit provided with a third wavelength limiting filter that transmits visible light having a wavelength longer than that of the second wavelength limiting filter,
The determination unit is configured such that a ratio of a measurement value of the second light detection unit to a measurement value of the first light detection unit is equal to or less than a first threshold value, and a measurement value of the first light detection unit Alternatively, when the ratio of the measurement value of the third light detection unit to the measurement value of the second light detection unit is equal to or greater than a second threshold, an identification signal determined as natural light is output. The light source identification device according to claim 2.
前記第１の光検知部の測定値及び前記第２の光検知部の測定値を比較して自然光と人工光とを識別する判断部と、
を備えた光源識別装置の光源識別方法であって、
前記第１の光検知部で測定される波長４８０ｎｍ〜５２０ｎｍの波長域の可視光強度の測定値と、前記第１の光検知部で測定される波長域よりも長波長の可視光強度が測定される前記第２の光検知部の測定値と、を取得するステップと、
前記第１の光検知部の測定値に対する前記第２の光検知部の測定値の比率が第１の閾値以上であるかを判定するステップと、
を有することを特徴とする光源識別方法。 A first light detection unit and a second light detection unit that measure light intensity in a specific wavelength range;
A determination unit for comparing natural light and artificial light by comparing the measurement value of the first light detection unit and the measurement value of the second light detection unit;
A light source identification method for a light source identification device comprising:
The measurement value of the visible light intensity in the wavelength range of 480 nm to 520 nm measured by the first light detection unit, and the visible light intensity of a wavelength longer than the wavelength range measured by the first light detection unit are measured. A measurement value of the second light detection unit to be obtained;
Determining whether the ratio of the measurement value of the second light detection unit to the measurement value of the first light detection unit is equal to or greater than a first threshold;
A light source identification method comprising:
前記第１の光検知部の測定値及び前記第２の光検知部の測定値並びに前記第３の光検知部の測定値を比較して自然光と人工光とを識別する判断部と、
を備えた光源識別装置の光源識別方法であって、
前記第１の光検知部で測定される波長４８０ｎｍ〜５２０ｎｍの波長域の可視光強度の測定値と、前記第２の光検知部で測定される波長５２５ｎｍ〜５６５ｎｍの波長域の可視光強度の測定値と、前記第２の光検知部で測定される波長域よりも長波長の可視光強度が測定される前記第３の光検知部の測定値と、を取得するステップと、
前記第１の光検知部の測定値に対する前記第２の光検知部の測定値の比率が第１の閾値以下であるかを判定するステップと、
前記第１の光検知部の測定値または前記第２の光検知部の測定値に対する前記第３の光検知部の測定値の比率が第２の閾値以上であるかを判定するステップと、
を有することを特徴とする光源識別方法。 A first light detector, a second light detector, and a third light detector that measure the light intensity of a specific wavelength;
A determination unit that compares the measurement value of the first light detection unit, the measurement value of the second light detection unit, and the measurement value of the third light detection unit to identify natural light and artificial light;
A light source identification method for a light source identification device comprising:
The measurement value of the visible light intensity in the wavelength range of 480 nm to 520 nm measured by the first light detection unit and the visible light intensity of the wavelength range of 525 nm to 565 nm measured by the second light detection unit. Obtaining a measurement value and a measurement value of the third light detection unit in which a visible light intensity having a wavelength longer than the wavelength range measured by the second light detection unit is measured;
Determining whether the ratio of the measurement value of the second light detection unit to the measurement value of the first light detection unit is equal to or less than a first threshold;
Determining whether a ratio of a measurement value of the first light detection unit or a measurement value of the third light detection unit to a measurement value of the second light detection unit is equal to or greater than a second threshold;
A light source identification method comprising:
The light source identification method according to claim 8, wherein the third light detection unit measures visible light intensity in a wavelength region of a wavelength of 700 nm to 750 nm.
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| CN (1) | CN103063295B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016528701A (en) * | 2013-08-15 | 2016-09-15 | フィリップス ライティング ホールディング ビー ヴィ | Lighting control device |
| CN110486701A (en) * | 2019-08-06 | 2019-11-22 | 苏州久荣光照明电器有限公司 | Photosensitive sensor |
| GB2594749A (en) * | 2020-05-07 | 2021-11-10 | Vestemi Ltd | Radiator thermostatic control |
| CN113747637A (en) * | 2021-08-03 | 2021-12-03 | 安徽长龙电气集团有限公司 | Night illumination optimization method for long tunnel entrance section of expressway |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105898260B (en) * | 2016-04-07 | 2018-01-19 | 广东欧珀移动通信有限公司 | A kind of method and device for adjusting camera white balance |
| CN108235518B (en) * | 2018-01-25 | 2020-07-03 | 深圳民爆光电股份有限公司 | LED intelligent control energy-saving system |
| CN111207831B (en) * | 2020-01-10 | 2022-05-20 | 安徽皖仪科技股份有限公司 | Light source switching method of multi-light source monochromator |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60143147A (en) * | 1983-12-28 | 1985-07-29 | Stanley Electric Co Ltd | Flashing controller for automobile lighting device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6082822A (en) * | 1983-10-12 | 1985-05-11 | Matsushita Electric Ind Co Ltd | Judging apparatus of lamp characteristics |
| JP2927829B2 (en) * | 1989-08-18 | 1999-07-28 | 富士通株式会社 | Fluorescent fiber sensor |
| US6774988B2 (en) * | 2002-07-30 | 2004-08-10 | Gentex Corporation | Light source detection and categorization system for automatic vehicle exterior light control and method of manufacturing |
| JP4404329B2 (en) * | 1999-12-28 | 2010-01-27 | ホーチキ株式会社 | Flame detection device |
| DE10014549A1 (en) * | 2000-03-23 | 2001-09-27 | Bosch Gmbh Robert | Device for automatic switching of vehicle illumination devices switches them on or keeps them on if periodically varying light intensity signal component detected with certain amplitude |
-
2011
- 2011-10-24 JP JP2011232402A patent/JP2013086784A/en not_active Withdrawn
-
2012
- 2012-09-19 CN CN201210350721.6A patent/CN103063295B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60143147A (en) * | 1983-12-28 | 1985-07-29 | Stanley Electric Co Ltd | Flashing controller for automobile lighting device |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016528701A (en) * | 2013-08-15 | 2016-09-15 | フィリップス ライティング ホールディング ビー ヴィ | Lighting control device |
| CN110486701A (en) * | 2019-08-06 | 2019-11-22 | 苏州久荣光照明电器有限公司 | Photosensitive sensor |
| GB2594749A (en) * | 2020-05-07 | 2021-11-10 | Vestemi Ltd | Radiator thermostatic control |
| GB2594749B (en) * | 2020-05-07 | 2022-08-31 | Secure Meters Uk Ltd | Radiator thermostatic control |
| CN113747637A (en) * | 2021-08-03 | 2021-12-03 | 安徽长龙电气集团有限公司 | Night illumination optimization method for long tunnel entrance section of expressway |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103063295B (en) | 2015-07-22 |
| CN103063295A (en) | 2013-04-24 |
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