JP5462535B2 - Lighting device - Google Patents

Lighting device Download PDF

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JP5462535B2
JP5462535B2 JP2009151611A JP2009151611A JP5462535B2 JP 5462535 B2 JP5462535 B2 JP 5462535B2 JP 2009151611 A JP2009151611 A JP 2009151611A JP 2009151611 A JP2009151611 A JP 2009151611A JP 5462535 B2 JP5462535 B2 JP 5462535B2
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light
light emitting
dimming
chromaticity
dimming level
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JP2011009078A (en
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善宣 村上
光治 中川原
浩行 迫
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Panasonic Corp
Panasonic Holdings Corp
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Panasonic Corp
Matsushita Electric Industrial Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

Description

本発明は、照明光の光色を可変とした照明装置に関するものである。   The present invention relates to an illumination device in which the light color of illumination light is variable.

発光ダイオードを光源とする従来の照明装置として、例えば特許文献１には、第１の発光ダイオード（白色発光ダイオード）と、第１の発光ダイオードと異なる発光色の第２の発光ダイオード（有色発光ダイオード）とを照明光源として備え、照明光源が照射する照明光（混色光）を調光制御する照明装置が記載されている。そして、調光時に第１，第２の発光ダイオードの各出力を個別に調整することによって、照明光源が照射する照明光の光量および光色（色温度）を調光レベルに応じて変化させることが可能となる。   As a conventional illumination device using a light emitting diode as a light source, for example, Patent Document 1 discloses a first light emitting diode (white light emitting diode) and a second light emitting diode (colored light emitting diode) having a light emission color different from that of the first light emitting diode. ) As an illumination light source, and an illumination device that performs dimming control of illumination light (mixed color light) emitted by the illumination light source is described. Then, by individually adjusting the outputs of the first and second light emitting diodes during dimming, the amount of light and the light color (color temperature) of the illumination light emitted by the illumination light source are changed according to the dimming level. Is possible.

特開２００４−１１１１０４号公報JP 2004-111104 A

ここで、光色を数値化するには、ＣＩＥ−ＸＹＺ表色系が最も一般的であり、これに基づく照明光源の色度を示すｘｙ色度座標を図７に示し、図７中のＬｋは、黒体の色温度をつないだ黒体軌跡となる。   Here, in order to quantify the light color, the CIE-XYZ color system is the most common, and xy chromaticity coordinates indicating the chromaticity of the illumination light source based on the CIE-XYZ color system are shown in FIG. 7, and Lk in FIG. Is a black body locus connecting the color temperatures of black bodies.

ところで、発光ダイオードを光源とする照明装置は、白熱ランプを光源とする照明装置の代替として使用される場合が多い。白熱ランプは定格点灯時を１００％として調光レベル（光量）を低下させたとき、光量の低下とともに、照明光の色度が略円弧状の黒体軌跡Ｌｋ（図７参照）に沿って変化するように色温度も低下する特性を有している。   By the way, an illuminating device using a light emitting diode as a light source is often used as an alternative to an illuminating device using an incandescent lamp as a light source. When the dimming level (light quantity) of the incandescent lamp is reduced to 100% at the rated lighting, the chromaticity of the illumination light changes along a substantially arcuate black body locus Lk (see FIG. 7) as the light quantity decreases. In this way, the color temperature is also lowered.

一方、発光ダイオードを調光した場合、光の波長は変化せずに光量のみが変化する特性を有しており、特許文献１に記載されている従来例のように、色温度が互いに異なる２種類の発光ダイオードの光量を個別に調整する構成では、調光時の色度の変化が黒体軌跡Ｌｋを外れた軌跡を描くために、自然な色温度の変化をさせることができなかった。例えば、図７のｘｙ色度座標において、略円弧状の黒体軌跡Ｌｋ上の２点Ｐ１１，Ｐ１２に第１，第２の発光ダイオードの各色度を設定した場合、第１，第２の発光ダイオードの光量を個別に調整すると、このＰ１１−Ｐ１２を結ぶ直線Ｌｃに沿って照明光源の色度が変化し、調光時の色度の変化が黒体軌跡Ｌｋを外れた軌跡を描いてしまう。   On the other hand, when the light emitting diode is dimmed, it has a characteristic that only the light amount changes without changing the wavelength of the light, and the color temperatures are different from each other as in the conventional example described in Patent Document 1. In the configuration in which the amount of light of each type of light emitting diode is individually adjusted, a change in chromaticity during dimming draws a locus that deviates from the black body locus Lk, and thus a natural color temperature change cannot be made. For example, when the chromaticities of the first and second light emitting diodes are set at two points P11 and P12 on the substantially arcuate black body locus Lk in the xy chromaticity coordinates of FIG. When the light quantity of the diode is individually adjusted, the chromaticity of the illumination light source changes along the straight line Lc connecting P11-P12, and the change in chromaticity during dimming draws a locus that deviates from the black body locus Lk. .

本発明は上記事情に鑑みて為されたものであり、その目的は、発光ダイオードを光源とする場合においても黒体軌跡に近い自然な特性で照明光の光色を調整することができる照明装置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 thereof is to provide a lighting device capable of adjusting the light color of illumination light with natural characteristics close to a black body locus even when a light emitting diode is used as a light source. Is to provide.

請求項１の発明は、互いに異なる色温度で発光する第１，第２，第３の発光手段からなる照明光源と、指示された調光レベルに基づいて第１，第２，第３の発光手段の光量を個別に調整し、照明光源から照射される照明光の色度および光量を前記指示された調光レベルに応じた色度および光量に制御する調光制御手段とを備え、第２の発光手段は、第１の発光手段より低い色温度で発光し、第３の発光手段は、第１の発光手段より低く、第２の発光手段より高い色温度で発光し、調光制御手段は、前記指示された調光レベルが高くなるにしたがって第１の発光手段の光量を増加させるとともに第２の発光手段の光量を減少させ、さらに第１，第２，第３の発光手段の光量の合計が前記指示された調光レベルに応じた光量となるように第３の発光手段の光量を調整することによって、前記指示された調光レベルに応じて照明光源の光量を変化させるときに、照明光源の色度を黒体軌跡に略沿って変化させることを特徴とする。   According to the first aspect of the present invention, there is provided an illumination light source comprising first, second, and third light emitting means that emit light at different color temperatures, and first, second, and third light emission based on the instructed dimming level. Dimming control means for individually adjusting the light amount of the means and controlling the chromaticity and light amount of the illumination light emitted from the illumination light source to the chromaticity and light amount according to the instructed dimming level; The light emitting means emits light at a color temperature lower than that of the first light emitting means, and the third light emitting means emits light at a color temperature lower than that of the first light emitting means and higher than that of the second light emitting means. Increases the light quantity of the first light-emitting means and decreases the light quantity of the second light-emitting means as the instructed dimming level increases, and further reduces the light quantity of the first, second, and third light-emitting means. So that the total amount of light becomes a light amount corresponding to the instructed dimming level. By adjusting the amount of the unit, when changing the light amount of the illumination light source in response to the instruction dimming levels and changing substantially in the black body locus chromaticity of the illumination light source.

この発明によれば、発光ダイオードを光源とする場合においても黒体軌跡に近い自然な特性で照明光の光色を調整することができる。   According to the present invention, even when a light emitting diode is used as a light source, the light color of illumination light can be adjusted with natural characteristics close to a black body locus.

請求項２の発明は、請求項１において、前記調光制御手段は、前記指示された調光レベルが、最大調光レベルと最小調光レベルとの間にある所定の調光レベルであるときに第３の発光手段の光量を最大に調整し、前記指示された調光レベルが前記所定の調光レベルから増減するにしたがって第３の発光手段の光量を減少させることを特徴とする。   According to a second aspect of the present invention, in the first aspect, the dimming control unit is configured such that the instructed dimming level is a predetermined dimming level between the maximum dimming level and the minimum dimming level. Further, the light amount of the third light emitting unit is adjusted to the maximum, and the light amount of the third light emitting unit is decreased as the instructed light control level increases or decreases from the predetermined light control level.

この発明によれば、調光時の照明光の光色を黒体軌跡に近い自然な特性で調整できるとともに、第１，第２，第３の発光手段の光量の合計が調光レベルに応じた光量となるように第３の発光手段の光量を調整することによって、調光時の照明光の照明光の光量を適切に調整できる。   According to the present invention, the light color of the illumination light during dimming can be adjusted with natural characteristics close to a black body locus, and the total light amount of the first, second, and third light emitting means depends on the dimming level. By adjusting the light amount of the third light emitting means so that the light amount becomes the same, the light amount of the illumination light of the illumination light during dimming can be adjusted appropriately.

以上説明したように、本発明では、発光ダイオードを光源とする場合においても黒体軌跡に近い自然な特性で照明光の光色を調整することができるという効果がある。   As described above, the present invention has an effect that the light color of illumination light can be adjusted with natural characteristics close to a black body locus even when a light emitting diode is used as a light source.

実施形態１の照明装置のブロック構成を示す図である。It is a figure which shows the block configuration of the illuminating device of Embodiment 1. FIG. 同上の各発光ダイオードの色度をプロットしたｘｙ色度座標を示す図である。It is a figure which shows xy chromaticity coordinate which plotted the chromaticity of each light emitting diode same as the above. 同上の調光信号の電圧レベルに対する発光ダイオードの各光量の対応関係を示すグラフである。It is a graph which shows the correspondence of each light quantity of a light emitting diode with respect to the voltage level of a light control signal same as the above. 同上の調光時における照明光源の色度の変化を示す図である。It is a figure which shows the change of the chromaticity of the illumination light source at the time of light control same as the above. 実施形態２の調光信号の電圧レベルに対する発光ダイオードの各光量の対応関係を示すグラフである。It is a graph which shows the correspondence of each light quantity of the light emitting diode with respect to the voltage level of the light control signal of Embodiment 2. 同上の調光時における照明光源の色度の変化を示す図である。It is a figure which shows the change of the chromaticity of the illumination light source at the time of light control same as the above. 従来の照明光源の色度の変化を示す図である。It is a figure which shows the change of the chromaticity of the conventional illumination light source.

以下、本発明の実施の形態を図面に基づいて説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

（実施形態１）
本実施形態の照明装置は、図１に示すように、照明光源１と、電源回路２と、調光制御部３とで構成されている。 (Embodiment 1)
As shown in FIG. 1, the illumination device of the present embodiment includes an illumination light source 1, a power supply circuit 2, and a dimming control unit 3.

照明光源１は、３色の発光ダイオードＤ１，Ｄ２，Ｄ３を有しており、図２は、発光ダイオードＤ１，Ｄ２，Ｄ３の各色度Ｐ１，Ｐ２，Ｐ３を、ＣＩＥ−ＸＹＺ表色系に基づくｘｙ色度座標にプロットしている。ここで、各色の発光ダイオードＤ１，Ｄ２，Ｄ３の光色の色度がそれぞれＰ１（ｘ１，ｙ１），Ｐ２（ｘ２，ｙ２），Ｐ３（ｘ３，ｙ３）であり、発光ダイオードＤ１，Ｄ２，Ｄ３の色温度は互いに異なる。また、図２中のＬｋは、黒体の色温度をつないだ黒体軌跡となる。なお、本発明では、黒体軌跡Ｌｋ上にない光源の色を表すためにその色に最も近い黒体の色温度で表した相関色温度も含めて、色温度と称す。 The illumination light source 1 has light emitting diodes D1, D2, and D3 of three colors. FIG. 2 shows the chromaticities P1, P2, and P3 of the light emitting diodes D1, D2, and D3 based on the CIE-XYZ color system. Plotted in xy chromaticity coordinates. Here, P1 chromaticity of the light color of the light emitting diodes D1, D2, D3 of the respective colors are (x 1, y 1), P2 (x 2, y 2), a P3 (x 3, y 3) , the light emitting The color temperatures of the diodes D1, D2, and D3 are different from each other. Also, Lk in FIG. 2 is a black body locus connecting the color temperatures of the black bodies. In the present invention, in order to represent the color of a light source not on the black body locus Lk, the color temperature including the correlated color temperature represented by the color temperature of the black body closest to that color is also referred to as color temperature.

発光ダイオードＤ１の色度Ｐ１、発光ダイオードＤ２の色度Ｐ２は、黒体軌跡Ｌｋ上に設定されてｘ１＜ｘ２の関係にあり、発光ダイオードＤ２の色温度は、発光ダイオードＤ１の色温度より低くなる。例えば、発光ダイオードＤ１の色温度：７０００Ｋ、発光ダイオードＤ２の色温度：２５００Ｋに設定される。さらに、発光ダイオードＤ３の色度Ｐ３は、発光ダイオードＤ１の色度Ｐ１と発光ダイオードＤ２の色度Ｐ２とを結ぶ直線Ｌａの２等分垂線Ｌｂ上で、黒体軌跡Ｌｋよりｙ値が大きい色度（黒体軌跡Ｌｋを越えた色度）に設定されており、発光ダイオードＤ１の色度Ｐ１、発光ダイオードＤ２の色度Ｐ２に対して、ｘ１＜ｘ３＜ｘ２の関係にある。この発光ダイオードＤ３の色温度は、発光ダイオードＤ１より低く、発光ダイオードＤ２より高くなる。 The chromaticity P1 of the light emitting diode D1 and the chromaticity P2 of the light emitting diode D2 are set on the black body locus Lk and have a relationship of x 1 <x 2 , and the color temperature of the light emitting diode D2 is the color temperature of the light emitting diode D1. Lower. For example, the color temperature of the light emitting diode D1 is set to 7000K, and the color temperature of the light emitting diode D2 is set to 2500K. Further, the chromaticity P3 of the light emitting diode D3 is a color whose y value is larger than the black body locus Lk on the bisector Lb of the straight line La connecting the chromaticity P1 of the light emitting diode D1 and the chromaticity P2 of the light emitting diode D2. Degree (chromaticity exceeding the black body locus Lk), and has a relationship of x 1 <x 3 <x 2 with respect to the chromaticity P1 of the light emitting diode D1 and the chromaticity P2 of the light emitting diode D2. The color temperature of the light emitting diode D3 is lower than the light emitting diode D1 and higher than the light emitting diode D2.

電源回路２は、商用電源ＡＣからの入力を所望の直流電圧に変換して出力し、その出力端には、発光ダイオードＤ１，Ｄ２，Ｄ３が並列接続されている。   The power supply circuit 2 converts the input from the commercial power supply AC into a desired DC voltage and outputs it, and light emitting diodes D1, D2, and D3 are connected in parallel at the output end.

調光制御部３は、駆動信号変換部３０と、出力調整部３１，３２，３３とで構成されており、入力された調光信号（図示しない外部コントローラや、本照明器具に設けた図示しない調光操作部からの調光信号）によって指示された調光レベルに基づいて、発光ダイオードＤ１，Ｄ２，Ｄ３の光量を個別に調整することにより、照明光源１が照射する総光量を調光制御する。駆動信号変換部３０は、電源回路２から制御電源を供給されて、調光信号を出力調整部３１，３２，３３に対する駆動信号に各々変換する。駆動信号変換部３０はマイコンとメモリを有しており、調光信号が調光レベルに対応した電圧レベルの直流電圧信号であるとすると、調光信号の電圧レベル、当該電圧レベルに対する発光ダイオードＤ１，Ｄ２，Ｄ３の各光出力（光量Ｙ１，Ｙ２，Ｙ３１）の対応関係（図３参照）を表した変換テーブルがメモリに予め格納され、当該変換テーブルに基づいてマイコンにより直流電圧信号を駆動信号に変換する。   The dimming control unit 3 includes a drive signal conversion unit 30 and output adjustment units 31, 32, and 33, and an input dimming signal (not illustrated, provided in an external controller (not illustrated) or the lighting fixture (not illustrated). Based on the dimming level indicated by the dimming signal from the dimming operation unit), the dimming control is performed on the total light amount emitted from the illumination light source 1 by individually adjusting the light amounts of the light emitting diodes D1, D2, and D3. To do. The drive signal conversion unit 30 is supplied with control power from the power supply circuit 2 and converts the dimming signals into drive signals for the output adjustment units 31, 32, and 33, respectively. The drive signal conversion unit 30 includes a microcomputer and a memory, and when the dimming signal is a DC voltage signal having a voltage level corresponding to the dimming level, the voltage level of the dimming signal and the light emitting diode D1 corresponding to the voltage level. , D2, and D3, a conversion table representing the correspondence relationship (see FIG. 3) of the light outputs (light amounts Y1, Y2, and Y31) is stored in advance in the memory, and a DC voltage signal is driven by the microcomputer based on the conversion table. Convert to

そして、出力調整部３１，３２，３３は、電源回路２の出力端間で発光ダイオードＤ１，Ｄ２，Ｄ３に直列接続された図示しないスイッチング素子を具備しており、駆動信号変換部３０が、オンデューティ比が可変である一定周期の矩形波信号からなる駆動信号を出力することにより、出力調整部３１，３２，３３のスイッチング素子をＰＷＭ（パルス幅変調）制御して発光ダイオードＤ１，Ｄ２，Ｄ３への給電量を調節している。   The output adjustment units 31, 32, and 33 include switching elements (not shown) connected in series to the light emitting diodes D1, D2, and D3 between the output terminals of the power supply circuit 2, and the drive signal conversion unit 30 is turned on. By outputting a drive signal composed of a rectangular wave signal having a constant cycle with a variable duty ratio, the switching elements of the output adjustment units 31, 32, and 33 are controlled by PWM (pulse width modulation), and the light emitting diodes D1, D2, and D3 are controlled. The amount of power supplied to is adjusted.

ここで、調光信号の電圧レベルが高いほど調光レベルが低下し（照明光源１の光量が減少して暗くなる）、調光信号の電圧レベルが低いほど調光レベルが増加する（照明光源１の光量が増加して明るくなる）とした場合、メモリに格納された変換テーブルは図３に示す特性を有する。まず、調光信号の電圧レベルが低くなる（調光レベルが高くなる）にしたがって、発光ダイオードＤ１の光量Ｙ１は直線的に増加し、発光ダイオードＤ２の光量Ｙ２は直線的に減少する。さらに、調光信号が最小電圧レベルＶ１（最大調光レベル）と最大電圧レベルＶ２（最小調光レベル）との範囲内で調整可能であるとすると、最小電圧レベルＶ１と最大電圧レベルＶ２との略中間にある所定の電圧レベルＶ３（≒Ｖ１＋｛（Ｖ２−Ｖ１）／２｝）に調光信号が設定されたときに、発光ダイオードＤ３の光量Ｙ３１は最大となる。そして、調光信号が電圧レベルＶ３から増減するにしたがって、発光ダイオードＤ３の光量Ｙ３１は直線的に減少し、調光信号の調整範囲の上下限方向では光量Ｙ３１がゼロとなっている。上記発光ダイオードＤ１，Ｄ２，Ｄ３の各光量Ｙ１，Ｙ２，Ｙ３１を合成した照明光源１の光量Ｙ０（図３参照）は、調光信号の電圧レベルが高くなる（調光レベルが低くなる）にしたがって減少する。   Here, the higher the voltage level of the dimming signal, the lower the dimming level (the light amount of the illumination light source 1 decreases and darkens), and the lower the dimming signal voltage level, the higher the dimming level (illumination light source). 3), the conversion table stored in the memory has the characteristics shown in FIG. First, as the voltage level of the dimming signal decreases (the dimming level increases), the light amount Y1 of the light emitting diode D1 increases linearly, and the light amount Y2 of the light emitting diode D2 decreases linearly. Further, if the dimming signal can be adjusted within the range of the minimum voltage level V1 (maximum dimming level) and the maximum voltage level V2 (minimum dimming level), the minimum voltage level V1 and the maximum voltage level V2 When the dimming signal is set to a predetermined voltage level V3 (≈V1 + {(V2−V1) / 2}) approximately in the middle, the light amount Y31 of the light emitting diode D3 becomes maximum. As the dimming signal increases or decreases from the voltage level V3, the light amount Y31 of the light emitting diode D3 decreases linearly, and the light amount Y31 becomes zero in the upper and lower limit directions of the dimming signal adjustment range. The light amount Y0 (see FIG. 3) of the illumination light source 1 that combines the light amounts Y1, Y2, and Y31 of the light emitting diodes D1, D2, and D3 increases the voltage level of the dimming signal (lowers the dimming level). Therefore, it decreases.

上記のように発光ダイオードＤ１，Ｄ２，Ｄ３の各色度や調光時の各光出力を設定することによって、調光信号に応じて照明光源１の光量を変化させた場合、照明光源１の色度は、図４に示すｘｙ色度座標の黒体軌跡Ｌｋを近似した屈曲線ＬＡ１に沿って変化する。具体的には、最大調光レベルから最小調光レベルに変化させた場合（調光信号の電圧レベルを低→高に変化させた場合）、照明光源１の色度は、発光ダイオードＤ１の色度Ｐ１付近から発光ダイオードＤ２の色度Ｐ２方向に直線Ｌａに沿って変化し、調光レベルが中間手前に達すると発光ダイオードＤ３の色度Ｐ３方向（直線Ｌａから離れる方向）に直線的に変化し、発光ダイオードＤ１の色度Ｐ１と発光ダイオードＤ２の色度Ｐ２とを結ぶ直線Ｌａの２等分垂線Ｌｂ上にまで達すると、その後は直線Ｌａに近付く方向に変化する。そして、さらに調光レベルが低下して、色度が直線Ｌａ上に達して以降は、発光ダイオードＤ２の色度Ｐ２方向に直線Ｌａに沿って変化し、最小調光レベルでは発光ダイオードＤ２の色度Ｐ２付近に達する。   When the light amount of the illumination light source 1 is changed in accordance with the dimming signal by setting each chromaticity of the light emitting diodes D1, D2, and D3 and each light output at the time of dimming as described above, the color of the illumination light source 1 The degree changes along a bending line LA1 approximating the black body locus Lk of the xy chromaticity coordinates shown in FIG. Specifically, when the maximum dimming level is changed to the minimum dimming level (when the voltage level of the dimming signal is changed from low to high), the chromaticity of the illumination light source 1 is the color of the light emitting diode D1. It changes along the straight line La in the chromaticity P2 direction of the light emitting diode D2 from the vicinity of the degree P1, and changes linearly in the chromaticity P3 direction (a direction away from the straight line La) of the light emitting diode D3 when the dimming level reaches the middle side Then, when reaching the bisector Lb of the straight line La connecting the chromaticity P1 of the light emitting diode D1 and the chromaticity P2 of the light emitting diode D2, it changes in a direction approaching the straight line La thereafter. Then, after the dimming level further decreases and the chromaticity reaches the straight line La, it changes along the straight line La in the chromaticity P2 direction of the light emitting diode D2, and the color of the light emitting diode D2 at the minimum dimming level. It reaches around P2.

ここで、調光信号の調整範囲の上下限方向では、発光ダイオードＤ３の光量Ｙ３１がゼロとなる範囲があり（図３参照）、この範囲では、照明光源１の色度変化を示す屈曲線ＬＡ１も、発光ダイオードＤ１の色度Ｐ１と発光ダイオードＤ２の色度Ｐ２とを結ぶ直線Ｌａに沿った特性となる（図４参照）。すなわち、調光信号の調整範囲の上下限方向では、従来と同様の色度特性となっている。   Here, in the upper and lower limit directions of the adjustment range of the dimming signal, there is a range where the light amount Y31 of the light emitting diode D3 becomes zero (see FIG. 3), and in this range, the bent line LA1 indicating the chromaticity change of the illumination light source 1 Also, the characteristic is along the line La connecting the chromaticity P1 of the light emitting diode D1 and the chromaticity P2 of the light emitting diode D2 (see FIG. 4). That is, in the upper and lower limit directions of the adjustment range of the dimming signal, the chromaticity characteristic is the same as that of the conventional one.

しかし、調光信号の調整範囲の中間付近では、発光ダイオードＤ３の光量Ｙ３１が増大し（図３参照）、照明光源１の色度変化を示す屈曲線ＬＡ１も、黒体軌跡Ｌｋに近付く方向に変化しており（図４参照）、人間の目には、白熱ランプと同様の自然な特性で照明光の光色が変化していると、違和感なく感じられる。すなわち、本発明において、「調光時の照明光源１の色度が黒体軌跡Ｌｋに近い軌跡で変化する」特性とは、「人間の視覚機能が白熱ランプと同様の自然な特性で照明光の光色が変化していると感じることができる」特性を指す。したがって、本実施形態では、調光時の照明光源１の色度は黒体軌跡Ｌｋに近い軌跡で変化し、白熱ランプと同様の自然な特性で照明光の光色を調整可能であるといえる。   However, near the middle of the adjustment range of the dimming signal, the light amount Y31 of the light emitting diode D3 increases (see FIG. 3), and the bent line LA1 indicating the chromaticity change of the illumination light source 1 also approaches the black body locus Lk. It has changed (see FIG. 4), and the human eye feels that there is no sense of incongruity when the light color of the illumination light changes with the same natural characteristics as an incandescent lamp. That is, in the present invention, the characteristic that “the chromaticity of the illumination light source 1 during dimming changes in a locus close to the black body locus Lk” means that “the human visual function is natural characteristics similar to an incandescent lamp and the illumination light It indicates the characteristic that the user can feel that the light color has changed. Therefore, in the present embodiment, the chromaticity of the illumination light source 1 during dimming changes along a locus close to the black body locus Lk, and it can be said that the light color of the illumination light can be adjusted with natural characteristics similar to those of an incandescent lamp. .

さらに、調光レベルの変化時に、発光ダイオードＤ１，Ｄ２の光量は互いに反対方向に増減するが、発光ダイオードＤ１，Ｄ２，Ｄ３の光量の合計が調光レベルに応じた光量となるように発光ダイオードＤ３の光量を調整することによって、照明光源１の光量を調整している。   Further, when the dimming level changes, the light amounts of the light emitting diodes D1, D2 increase or decrease in opposite directions, but the light emitting diodes so that the total light amount of the light emitting diodes D1, D2, D3 becomes a light amount corresponding to the dimming level. The light quantity of the illumination light source 1 is adjusted by adjusting the light quantity of D3.

このように本実施形態では、発光ダイオードＤ１，Ｄ２に加えて発光ダイオードＤ３を用いることによって、白熱ランプと同様に調光時の照明光の光色を黒体軌跡に近い自然な特性で調整できるとともに、調光時の照明光の光量を適切に調整できる。   As described above, in the present embodiment, by using the light emitting diode D3 in addition to the light emitting diodes D1 and D2, the light color of the illumination light at the time of dimming can be adjusted with natural characteristics close to a black body locus as in the incandescent lamp. In addition, the amount of illumination light during dimming can be adjusted appropriately.

（実施形態２）
本実施形態の照明装置は、実施形態１と同様に図１に示す構成を備えるが、発光ダイオードＤ３の光量制御が異なるものであって、実施形態１と同様の構成には同一の符号を付して説明は省略する。 (Embodiment 2)
Although the illumination device of the present embodiment has the configuration shown in FIG. 1 as in the first embodiment, the light quantity control of the light emitting diode D3 is different, and the same reference numerals are given to the same configurations as in the first embodiment. The description is omitted.

本実施形態の駆動信号変換部３０のメモリに格納された変換テーブルは図５に示す特性を有する。まず、調光信号の電圧レベルが低くなる（調光レベルが高くなる）にしたがって、発光ダイオードＤ１の光量Ｙ１は直線的に増加し、発光ダイオードＤ２の光量Ｙ２は直線的に減少する。さらに、調光信号が最小電圧レベルＶ１（最大調光レベル）と最大電圧レベルＶ２（最小調光レベル）との範囲内で調整可能であるとすると、最小電圧レベルＶ１と最大電圧レベルＶ２との略中間にある所定の電圧レベルＶ３（≒Ｖ１＋｛（Ｖ２−Ｖ１）／２｝）に調光信号が設定されたときに、発光ダイオードＤ３の光量Ｙ３２は最大となる。そして、調光信号が電圧レベルＶ３から増減するにしたがって、発光ダイオードＤ３の光量Ｙ３２は直線的に減少し、調光信号の調整範囲の上下限（最小電圧レベルＶ１、最大電圧レベルＶ２）に達した時点で光量Ｙ３２がゼロとなっている。上記発光ダイオードＤ１，Ｄ２，Ｄ３の各光量Ｙ１，Ｙ２，Ｙ３２を合成した照明光源１の光量Ｙ０（図５参照）は、調光信号の電圧レベルが高くなる（調光レベルが低くなる）にしたがって減少する。   The conversion table stored in the memory of the drive signal converter 30 of this embodiment has the characteristics shown in FIG. First, as the voltage level of the dimming signal decreases (the dimming level increases), the light amount Y1 of the light emitting diode D1 increases linearly, and the light amount Y2 of the light emitting diode D2 decreases linearly. Further, if the dimming signal can be adjusted within the range of the minimum voltage level V1 (maximum dimming level) and the maximum voltage level V2 (minimum dimming level), the minimum voltage level V1 and the maximum voltage level V2 When the dimming signal is set to a predetermined voltage level V3 (≈V1 + {(V2−V1) / 2}) approximately in the middle, the light amount Y32 of the light emitting diode D3 becomes maximum. As the dimming signal increases or decreases from the voltage level V3, the light amount Y32 of the light emitting diode D3 decreases linearly and reaches the upper and lower limits (minimum voltage level V1, maximum voltage level V2) of the dimming signal adjustment range. At that time, the light quantity Y32 is zero. The light amount Y0 (see FIG. 5) of the illumination light source 1 that combines the light amounts Y1, Y2, and Y32 of the light emitting diodes D1, D2, and D3 increases the voltage level of the dimming signal (lowers the dimming level). Therefore, it decreases.

上記のように発光ダイオードＤ１，Ｄ２，Ｄ３の各色度や調光時の各光出力を設定することによって、調光信号に応じて照明光源１の光量を変化させた場合、照明光源１の色度は、図６に示すｘｙ色度座標の黒体軌跡Ｌｋを近似した屈曲線ＬＡ２に沿って変化する。具体的には、最大調光レベルから最小調光レベルに変化させた場合（調光信号の電圧レベルを低→高に変化させた場合）、照明光源１の色度は、発光ダイオードＤ１の色度Ｐ１付近から発光ダイオードＤ３の色度Ｐ３方向に直線的に変化し、発光ダイオードＤ１の色度Ｐ１と発光ダイオードＤ２の色度Ｐ２とを結ぶ直線Ｌａの２等分垂線Ｌｂ上にまで達すると、その後は発光ダイオードＤ２の色度Ｐ２方向に直線的に変化し、最小調光レベルでは発光ダイオードＤ２の色度Ｐ２付近に達する。すなわち、本実施形態の屈曲線ＬＡ２は、実施形態１の屈曲線ＬＡ１に比べて黒体軌跡Ｌｋにより近い特性となっており、調光時の照明光源１の色度は黒体軌跡Ｌｋにより近い軌跡で変化し、より自然な特性で照明光の光色を調整することができる。   When the light amount of the illumination light source 1 is changed in accordance with the dimming signal by setting each chromaticity of the light emitting diodes D1, D2, and D3 and each light output at the time of dimming as described above, the color of the illumination light source 1 The degree changes along a bending line LA2 approximating the black body locus Lk of the xy chromaticity coordinates shown in FIG. Specifically, when the maximum dimming level is changed to the minimum dimming level (when the voltage level of the dimming signal is changed from low to high), the chromaticity of the illumination light source 1 is the color of the light emitting diode D1. When it changes linearly in the direction of chromaticity P3 of the light emitting diode D3 from near the degree P1, and reaches a bisector Lb of a straight line La connecting the chromaticity P1 of the light emitting diode D1 and the chromaticity P2 of the light emitting diode D2. Thereafter, it linearly changes in the direction of chromaticity P2 of the light emitting diode D2, and reaches near the chromaticity P2 of the light emitting diode D2 at the minimum dimming level. That is, the bent line LA2 of the present embodiment is closer to the black body locus Lk than the bent line LA1 of the first embodiment, and the chromaticity of the illumination light source 1 during dimming is closer to the black body locus Lk. The color of the illumination light can be adjusted with more natural characteristics.

さらに、調光レベルの変化時に、発光ダイオードＤ１，Ｄ２の光量は互いに反対方向に増減するが、発光ダイオードＤ１，Ｄ２，Ｄ３の光量の合計が調光レベルに応じた光量となるように発光ダイオードＤ３の光量を調整することによって、照明光源１の光量を調整している。   Further, when the dimming level changes, the light amounts of the light emitting diodes D1, D2 increase or decrease in opposite directions, but the light emitting diodes so that the total light amount of the light emitting diodes D1, D2, D3 becomes a light amount corresponding to the dimming level. The light quantity of the illumination light source 1 is adjusted by adjusting the light quantity of D3.

このように本実施形態では、発光ダイオードＤ１，Ｄ２に加えて発光ダイオードＤ３を用いることによって、白熱ランプと同様に調光時の照明光の光色を黒体軌跡に近い自然な特性で調整できるとともに、調光時の照明光の光量を適切に調整できる。   As described above, in the present embodiment, by using the light emitting diode D3 in addition to the light emitting diodes D1 and D2, the light color of the illumination light at the time of dimming can be adjusted with natural characteristics close to a black body locus as in the incandescent lamp. In addition, the amount of illumination light during dimming can be adjusted appropriately.

１ 照明光源
Ｄ１，Ｄ２，Ｄ３ 発光ダイオード
２ 電源回路
３ 調光制御部
３０ 駆動信号変換部
３１，３２，３３ 出力調整部
ＡＣ 商用電源 DESCRIPTION OF SYMBOLS 1 Illumination light source D1, D2, D3 Light emitting diode 2 Power supply circuit 3 Dimming control part 30 Drive signal conversion part 31, 32, 33 Output adjustment part AC Commercial power supply

Claims (2)

互いに異なる色温度で発光する第１，第２，第３の発光手段からなる照明光源と、指示された調光レベルに基づいて第１，第２，第３の発光手段の光量を個別に調整し、照明光源から照射される照明光の色度および光量を前記指示された調光レベルに応じた色度および光量に制御する調光制御手段とを備え、
第２の発光手段は、第１の発光手段より低い色温度で発光し、第３の発光手段は、第１の発光手段より低く、第２の発光手段より高い色温度で発光し、
調光制御手段は、前記指示された調光レベルが高くなるにしたがって第１の発光手段の光量を増加させるとともに第２の発光手段の光量を減少させ、さらに第１，第２，第３の発光手段の光量の合計が前記指示された調光レベルに応じた光量となるように第３の発光手段の光量を調整することによって、前記指示された調光レベルに応じて照明光源の光量を変化させるときに、照明光源の色度を黒体軌跡に略沿って変化させる
ことを特徴とする照明装置。 The illumination light source composed of first, second, and third light emitting means that emit light at different color temperatures, and the light amounts of the first, second, and third light emitting means are individually adjusted based on the instructed dimming level And a dimming control means for controlling the chromaticity and light amount of the illumination light emitted from the illumination light source to chromaticity and light amount according to the instructed dimming level,
The second light emitting means emits light at a color temperature lower than that of the first light emitting means, the third light emitting means emits light at a color temperature lower than that of the first light emitting means and higher than that of the second light emitting means,
The dimming control means increases the light quantity of the first light emitting means and decreases the light quantity of the second light emitting means as the instructed dimming level increases, and further, the first, second, third By adjusting the light quantity of the third light emitting means so that the total light quantity of the light emitting means becomes the light quantity according to the instructed dimming level, the light quantity of the illumination light source is reduced according to the instructed dimming level. An illuminating device characterized in that, when changing, the chromaticity of the illumination light source is changed substantially along a black body locus. 前記調光制御手段は、前記指示された調光レベルが、最大調光レベルと最小調光レベルとの間にある所定の調光レベルであるときに第３の発光手段の光量を最大に調整し、前記指示された調光レベルが前記所定の調光レベルから増減するにしたがって第３の発光手段の光量を減少させることを特徴とする請求項１記載の照明装置。   The dimming control means adjusts the light quantity of the third light emitting means to the maximum when the instructed dimming level is a predetermined dimming level between the maximum dimming level and the minimum dimming level. The lighting device according to claim 1, wherein the light amount of the third light emitting unit is reduced as the instructed dimming level increases or decreases from the predetermined dimming level.
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