JP2008282755A - Lighting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting system having a plurality of illumination means having light sources of which the colors are nearly equal to one another, but, when the same object having spectral reflectivity in a predetermined condition is illuminated therewith, the color of the object is made different. <P>SOLUTION: This lighting system 100 is provided with an illumination means 10 illuminating an object by a first light source color having a first spectral distribution, and an illumination means 20 illuminating the object by a second light source color having a second spectral distribution. In the lighting system, the first spectral distribution is different from the second spectral distribution, and the value of chromaticity difference between the first light source color and the second light source color is in a predetermined range within the same color allowable range. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention mainly relates to an illumination device having at least two light source colors having substantially the same light source color, and a second illumination means.

In recent years, illumination means that emits only monochromatic light, that is, light having a wavelength in a certain range, such as LED (Light Emitting Diode) illumination and halogen illumination, has been widely used.
For example, as shown in Patent Document 1, a method of controlling optical characteristics that generally complicates light emitted from an arbitrary artificial light source is generally simplified by a method of controlling optical characteristics using a diffractive optical element. it can. Further, for example, as disclosed in Patent Document 2, a technique is disclosed in which an object to be irradiated can be visually recognized to a certain extent by combining a number of different LEDs.

For example, as shown in Patent Document 3, there is an illumination system using a plurality of LEDs for optimizing the color rendering index. Moreover, as shown in Patent Document 4, a circuit of an illumination system using a plurality of LEDs and an illumination device using the circuit are disclosed. Patent Document 5 discloses a technique for realizing an arbitrary emission color by an illumination device including a plurality of LEDs in which white LEDs and colored LEDs are combined.
Moreover, as shown in Patent Document 6, a technique for controlling color temperature and color rendering by a combination of a white LED and a colored LED is disclosed. Moreover, as shown in Patent Document 7, an apparatus for obtaining white light by combining a plurality of LEDs having different characteristics has been proposed.
JP 2002-365675 A JP-A-10-144126 JP-A-10-209504 JP 2001-297888 A JP 2004-111104 A WO2003 / 019072 JP 2006-202494 A

By the way, combining three colors of RGB (red, green, and blue) known as the three primary colors of light, combining illumination means that is recognized as white by human eyes, and two-color illumination means that have a complementary color relationship, There are illumination means that are recognized as white by human eyes.
Also, for example, it is known that the light color of the illumination means recognized by the human eye, that is, the light source color can be calculated as a numerical value based on a function such as a color matching function that expresses human visual characteristics as a function. It has been. It is also known that the color of an object can be calculated as a numerical value based on the light source color and the spectral reflectance distribution of the object.
In recent years, there is a market need for an illumination device that can recognize an object color as a different object color when an object having substantially the same light source color and a spectral reflectance distribution under a predetermined condition is illuminated. There were also challenges.

  The object of the present invention is to provide an illumination having a plurality of illumination means that when the same object having a spectral reflectance distribution of a predetermined condition is illuminated, but the color of the object becomes a different object color. To provide an apparatus.

  In order to solve the above problem, the present invention provides a first illumination means for illuminating with a first light source color having a first spectral distribution, and a second illuminating with a second light source color having a second spectral distribution. An illumination device comprising illumination means, wherein the first spectral distribution is different from the second spectral distribution, and the first chromaticity difference between the first light source color and the second light source color is different. The illumination device is characterized in that the value is a first predetermined range within the same color allowable range.

  In the present invention, the value of the first chromaticity difference between the first light source color and the second light source color is calculated by integration based on the first spectral distribution and the color matching function. The difference between the first tristimulus value expressed by the three values of X, Y, and Z and the second tristimulus value calculated by integration based on the second spectral distribution and the color matching function The first chromaticity difference that is a value of ΔX, ΔY, ΔZ that is the value of the first chromaticity difference falls within the range of the following formula (formula 1).

  In the present invention, the first object color of the object to be illuminated and the second object when illuminated with the first light source color in a wavelength region where the first spectral distribution and the second spectral distribution are different. The second chromaticity value of the object to be illuminated with the second object color when illuminated with the light source color is a second predetermined range within a different color range.

  Further, according to the present invention, the illumination target object reflects when the value of the second chromaticity difference between the first object color and the second object color is illuminated by the first light source color. Illumination by a third tristimulus value represented by three values of X, Y, Z calculated by integration based on a product of a third spectral distribution of light and a color matching function, and the second light source color A second color that is a difference value between a fourth tristimulus value calculated by integration based on a product of the fourth spectral distribution of the light reflected by the object to be illuminated and the color matching function | ΔX |, | ΔY |, and | ΔZ |, which are absolute values of ΔX, ΔY, and ΔZ that are values of the second chromaticity difference, are within the range of the following formula (Formula 2). It is characterized by that.

  In addition, the present invention is characterized in that either or both of the first illumination unit and the second illumination unit are composed of a plurality of light sources having different light source colors.

  In the present invention, the first illuminating means or the second illuminating means includes a light intensity ratio between the plurality of light sources having different light source colors, and the value of the first chromaticity difference falls within the same color allowable range. It is characterized by setting as follows.

  In the present invention, the first illuminance unit or the second illuminator includes a lighting time ratio between the plurality of light sources having different light source colors, and the first chromaticity difference value is within the same color allowable range. It is characterized by setting as follows.

  Further, the present invention is characterized in that either one or both of the first illumination means and the second illumination means are always lit.

  In addition, the present invention is characterized in that the lighting frequency at the time of blinking lighting is set to be equal to or higher than the critical fusion frequency of either or both of the first lighting unit and the second lighting unit.

  In addition, the present invention is characterized in that the first spectral distribution or the second spectral distribution includes ultraviolet light.

  In addition, the present invention is a second illumination unit used together with a first illumination unit that illuminates with a first light source color having a first spectral distribution, and is illuminated with a second light source color having a second spectral distribution. The second spectral distribution is a spectral distribution different from the first spectral distribution, and the second light source color has a value of a chromaticity difference from the first light source color within the same color allowable range. It is the 1st predetermined range which becomes the 2nd illumination means characterized by the above-mentioned.

  According to the present invention, the spectral reflection in a range in which the spectral distribution is different by an illuminating device including at least two illuminating means having different spectral distributions and having a chromaticity difference between the tristimulus values of the light source color within the same color allowable range. When an object whose rate distribution satisfies a predetermined condition is irradiated, the light source color of the illumination light does not change for each illumination means to be irradiated, but the observer can recognize that the object color has changed. effective.

Hereinafter, in an embodiment of the present invention, an XYZ color system adopted by the CIE (Commission Internationale de l'Eclairage) or an L ^* a ^* b ^* color system based on the XYZ color system. The light source color of the illumination light and the object color are represented by the system.
Next, the illuminating device 100 by one Embodiment of this invention is demonstrated with reference to drawings.
FIG. 1 is a diagram illustrating a lighting device 100 according to the present embodiment. The illumination device 100 includes an illumination unit 10 and an illumination unit 20 having different spectral distributions and substantially the same light source color.

Here, the light source colors of the illuminating means 10 and the illuminating means 20 are substantially equal to each other, the tristimulus values (X ₁₀ , Y ₁₀ , Z ₁₀ ) of the light source color of the illuminating means ₁₀ and the light source color of the illuminating means 20. This means that the chromaticity difference (ΔX, ΔY, ΔZ), which is the difference from the tristimulus values (X ₂₀ , Y _{20, Z20)} , falls within the following range (Equation 3).

Note that (Equation 3) described above is a range when the range in which ΔE ^* ab is 5 or less in the L ^* a ^* b ^* color system is converted to the XYZ color system. Here, the range in which ΔE ^* ab is 5 or less is usually the same color allowable range when a person compares two colors, that is, a color range recognized as the same color.
As a representative example of white light, the light source color of the illuminating means 10 and the light source color of the illuminating means 20 are examples in which the light source colors of the D65 light source (standard light source having substantially the same color temperature as sunlight) are substantially equal. Explained.

In the illumination device 100, the illumination means 10 includes a plurality of light sources 11, light sources 12, and light sources 13. The illumination unit 20 includes a plurality of light sources 14, light sources 15, and light sources 16. Here, as an application example of the light sources 11 to 16, a case where an LED having monochromatic light is applied will be described as an example. In FIG. 1, light sources having the same spectral distribution are shown using the same hatching.
FIG. 2 is a spectral distribution graph showing the spectral distribution 41 of the illumination means 10 composed of the light source 11, the light source 12 and the light source 13, and the spectral distribution 42 of the illumination means 20 composed of the light source 14, the light source 15 and the light source 16. .
In FIG. 2, a range indicated by reference numeral 31 (wavelength width of about 570 nm to 635 nm) shows a range in which the spectral distribution 41 and the spectral distribution 42 are greatly different from each other.

  3A shows a spectral distribution 51 included in the light source 11 included in the illumination unit 10, a spectral distribution 52 included in the light source 12, and a spectral distribution 53 included in the light source 13, and the luminance value Y of each is 100. It is a graph when normalized to. FIG. 3B shows a spectral distribution 54 included in the light source 14 included in the illumination unit 20, a spectral distribution 55 included in the light source 15, and a spectral distribution 56 included in the light source 6. The luminance value Y of the light sources 14 to 16 is 100. It is the graph normalized so that.

FIG. 4 is a graph showing a color matching function which is a color sensitivity characteristic by a standard observer of the XYZ color system in a 10 ° field of view defined in 1931 by CIE.
5 shows the relative values of the light intensity for each wavelength of the illumination unit 10, the illumination unit 20, and the light sources 11 to 16 shown in the graphs in FIGS. 2-3, and the wavelength of the color matching function shown in FIG. It is a table | surface which shows a relative sensitivity value. Based on the color matching function shown in FIG. 5 and the spectral distribution 41 of the illuminating means 10, the tristimulus values (X ₁₀ , Y ₁₀ , Z ₁₀ ) of the light source color of the illuminating means 10 can be calculated by (Equation 4). is there. Specifically, the product calculated by multiplying the color matching function and the spectral distribution 41 of the illumination unit 10 is calculated by integrating the product with respect to the wavelength in the visible light region. Similarly, based on the color matching function shown in FIG. 5 and the spectral distribution 42 of the illuminating unit 20, the tristimulus values (X ₂₀ , Y ₂₀ , Z ₂₀ ) of the light source color of the illuminating unit 20 according to (Equation 4). Can be calculated.

Here, the function with the bar attached to “x (λ)” represents the color matching function x ₁₀ (λ) shown in FIG. 5, and similarly, the bar with “y (λ)” is attached. The function indicates y ₁₀ (λ) of the color matching function shown in FIG. 5, and the function with a bar attached to “x (λ)” indicates z ₁₀ (λ) of the color matching function shown in FIG. ing. S (λ) represents the spectral distribution of the light source.

Based on the above (Equation 4), the calculated tristimulus values (X ₁₀ , Y ₁₀ , Z ₁₀ ) of the light source color of the illumination means 10 are (94.38, 100.00, 109.47), and the illumination means 20 The tristimulus values (X ₂₀ , Y ₂₀ , Z ₂₀ ) of the light source colors are (94.60, 100.00, 108.36). Accordingly, since the chromaticity differences (ΔX, ΔY, ΔZ) are (−0.22, 0.00, 1.11), and are within the range of (Expression 3) described above, As shown in FIG. 2, the illumination means 20 emits illumination light that causes the observer to recognize the same color, although the spectral distribution is different in the range of reference numeral 31.

  Next, the tristimulus values of the object color when irradiated with the illumination light from the illumination unit 10 of the illumination device 100 and the illumination light from the illumination unit 20 will be described. Here, a DIC (DAINIPPON INK AND CHEMICALS, INCORPORATED) color guide (registered trademark) is shown as an example having a spectral reflectance distribution in which the tristimulus values of the object color change greatly when illuminated by the illumination means 10 and the illumination means 20. This will be described using the five color patches in the 17th edition. These five colors are color number “107” (DIC (17) -107), color number “146” (DIC (17) -146), color number “150” (DIC (17) -150), color, respectively. The number is “557” (DIC (17) -557), and the color number is “592” (DIC (17) -592). FIG. 6A is a graph of the spectral reflectance distribution of these five colors. FIG. 6B is a table showing spectral reflectance distribution values for the wavelengths of the five colors.

Here, for example, the object color when the color number “107” is irradiated by the illumination unit 10 and the illumination unit 20 can be calculated by the following procedure. Based on the color matching function shown in FIG. 5, the spectral distribution 41 of the illumination means 10, and the value of the spectral reflectance distribution of the color number “107” shown in FIG. It is possible to calculate the tristimulus values (X _10-107 , Y _10-107 , Z _10-107 ) of the object color of the color patch with the color number “107” when the light is irradiated. Specifically, the product calculated by multiplying the color matching function, the spectral distribution 41 of the illumination means 10 and the spectral reflectance distribution of the color number “107” shown in FIG. Calculate by integrating over wavelength.
Similarly, based on the color matching function shown in FIG. 5, the spectral distribution 42 of the illumination means 20, and the value of the spectral reflectance distribution of the color number “107” shown in FIG. The tristimulus values (X _20-107 , Y _20-107 , Z _20-107 ) of the object color of the color patch with the color number “107” when irradiated to the illumination unit 20 can be calculated.

Here, R (λ) represents the spectral reflectance for each wavelength of the object.
Incidentally, the product calculated by multiplying the spectral distribution S (λ) of the light source and the spectral reflectance distribution R (λ) of the illumination target object of the light source for each wavelength is obtained when the illumination target object reflects the illumination light. It is known that the spectral distribution of reflected light. That is, the above-described tristimulus value of the object color is obtained by multiplying the product calculated by multiplying the spectral distribution of the reflected light of the illumination light irradiated to the illumination target object by the color matching function of FIG. It is a value calculated by integrating with respect to the wavelength of.

FIG. 7 shows the tristimulus values when the above-mentioned five color patches are irradiated by the illumination unit 10 and the tristimulus values when the illumination unit 20 irradiates the L ^* a ^* b ^* from the XYZ color system ^. and L ^* a ^* b ^* values obtained by converting the color system, it is the difference ^{(ΔL *, Δa *, Δb} *), and is a table showing the values of the color difference Delta] E ^* ab.
Here, for example, the actual object color when the illumination means 10 irradiates the color number “107” is light blue (for example, a color close to the conventional color name “hyacinth” based on JIS (Japanese Industrial Standards)). The tristimulus values visually recognized by the observer as described above, but when the same color number “107” is irradiated by the illumination means 20, it is a dull pink color (for example, close to the conventional color name “Ayame Color” based on JIS) Color) is the tristimulus value visually recognized by the observer.

  As described above, in the range indicated by reference numeral 31 in FIG. 2 in which the light source colors of the same color and the illumination means 10 and the illumination means 20 that are visually recognized have different spectral distributions, the spectral reflectance distribution of the object is indicated by the reference numerals in the graph of FIG. As shown in FIG. 31, when the spectral reflectance distribution is not constant, the object (for example, an object having the spectral reflectance distribution with the color number “107”) is greatly different in color between the illumination unit 10 and the illumination unit 20. As an observer.

  However, since the illuminating means 10 and the illuminating means 20 are recognized by the observer as the same color as the light source color as described above, for example, when the illumination between the illuminating means 10 and the illuminating means 20 is switched, the light source color is changed. Is not changed, but it is possible to give the observer an impression that the color of an object having a spectral reflectance distribution such as color number “107” suddenly changes from light blue to dull pink. There is an effect.

  The combination of two illumination means having different spectral distributions and light source colors within the same color tolerance range and an object having a spectral reflectance distribution is the illumination means 10, illumination means 20, and color number “107”. The chromaticity difference (ΔX, ΔY, ΔZ) of the tristimulus values of the object between the illuminating means based on the spectral distribution of the reflected light of the object to be illuminated and the color matching function. However, any combination may be used as long as it is within a different color range that is a range that the observer recognizes as a different color.

  Here, the chromaticity difference (ΔX, ΔY, ΔZ) of the tristimulus values of the object between the illumination means is within a different color range that is recognized by the observer as a different color. The chromaticity difference (ΔX, This means that the absolute values (| ΔX |, | ΔY |, | ΔZ |) of ΔY, ΔZ) are within the following ranges.

Moreover, although the tristimulus value of the light source color by the illuminating means 10 and the illuminating means 20 in the illumination device 100 described above is an example of the white light source, the case of the tristimulus value of the light source color of the D65 light source has been described as an example. Not limited to this, as described above, the light source color tristimulus values (X ₁₀ , Y ₁₀ , Z ₁₀ ) of the illumination unit ₁₀ and the light source color tristimulus values (X ₂₀ , Y _{20, If} the chromaticity difference (ΔX, ΔY, ΔZ), which is the difference from _Z20) , is within the range where the light source colors are substantially equal and the spectral distributions of the illumination means 10 and the illumination means 20 are different, any Even the light source color of can be applied.

<Example 1 using ultraviolet light>
Moreover, it is good also as a structure which further uses the light source which has spectral distribution out of a visible light area | region in either or both of the illumination means 10 and the illumination means 20 of the illuminating device 100 in FIG. For example, in addition to the configuration of the illumination unit 10 including the light source 11, the light source 12, and the light source 13, the illumination unit 10 further includes an ultraviolet illumination unit including an ultraviolet light source that emits ultraviolet light having a wavelength of 400 nm (nanometer) or less. The first ultraviolet illumination device having the configuration will be described as an example.
Here, since the ultraviolet light source is outside the visible light region, the tristimulus value of the light source color of the ultraviolet illumination means including the ultraviolet light source and the tristimulus value of the light source color of the illumination means 10 are the same value, that is, for the observer. , It will be visually recognized as the same light source color.

  By the way, as described above, the tristimulus value of the object color is obtained by multiplying the spectral distribution of the reflected light of the illumination light irradiated on the illumination target object by the color matching function shown in FIG. This is a value calculated by integrating the wavelength in the light region.

  Here, when the paint (coloring material) applied to the surface of the object to be illuminated contains a fluorescent substance (also called a phosphor or fluorescent dye), it is included in the object to be illuminated by the fluorescent phenomenon caused by the ultraviolet light source of the ultraviolet illumination means. The fluorescent substance to be emitted emits light. Thus, the reflected light when the illumination target object is illuminated by the ultraviolet illumination means is reflected light of the illumination target object when illuminated by the illumination means 10 and light emitted by the fluorescence phenomenon of the ultraviolet light source and the fluorescent material. The reflected light is combined.

  Therefore, the spectral distribution of the reflected light when the illumination target object including the fluorescent material is irradiated by the illumination unit 10 is different from the spectral distribution of the reflected light when the object is illuminated by the ultraviolet illumination unit. Thereby, based on the spectral distribution of the reflected light and the color matching function, the tristimulus values of the object color calculated by the above (Equation 5) are illuminated by the illumination means 10 and the object is illuminated by the ultraviolet illumination means. Each case has a different value.

  Accordingly, there is an effect of allowing the observer to recognize the color of the illumination target object as a different color when the illumination target object including the fluorescent material is irradiated by the illumination unit 10 and when the object is illuminated by the ultraviolet illumination unit. is there. In addition, when there is a wavelength band in which the spectral reflectance distribution exceeds 100% due to the fluorescence phenomenon, there is an effect that the observer feels that the object emits light.

<Example 2 using ultraviolet light>
Next, as another example of using an ultraviolet light source, a case where an object including a fluorescent material is illuminated by the second ultraviolet illumination device including the ultraviolet illumination unit and the illumination unit 20 described above will be described.
By the way, the chromaticity difference of the tristimulus values of the light source color between the illumination unit 10 and the illumination unit 20 in FIG. 1 is within a range recognized by the observer as the same color. Further, the tristimulus values of the light source colors of the ultraviolet illuminating means and the illuminating means 10 are the light source color tristimulus values of the ultraviolet illuminating means including the ultraviolet light source and the illuminating means 10 because the ultraviolet light source is outside the visible light region. The tristimulus value of the light source color is the same value.
Therefore, the value of the chromaticity difference of the tristimulus values of the light source colors of the ultraviolet illumination means and the illumination means 20 is also the same value as the value of the chromaticity difference of the tristimulus values of the light source colors of the illumination means 10 and the illumination means 20. That is, it becomes the value of the chromaticity difference that is visually recognized as a similar light source color for the observer.

  However, as described above, the tristimulus value of the object color when the illumination target object is illuminated by the illumination unit 10 and the tristimulus of the object color when the illumination target object is illuminated by the ultraviolet illumination unit including an ultraviolet light source The value is a different tristimulus value depending on the fluorescence emission due to the fluorescence phenomenon of the ultraviolet illumination means. Thereby, the value of the chromaticity difference between the tristimulus values of the object color between the ultraviolet illumination means and the illumination means 20 is made larger than the value of the chromaticity difference between the tristimulus values of the object color between the illumination means 10 and the illumination means 20. There is an effect that can be made.

  For reference, examples of other spectral distributions having a light source color substantially equal to the light source color of the D65 light source are shown below. FIG. 8 is a graph showing the spectral distribution of the LED light sources of the light sources 1 to 6 including the light sources similar to the light sources 11 to 16 described above, with the luminance value Y being 100. FIG. 9 is a diagram in which the light source colors of the light sources 1 to 6 are plotted on the xy chromaticity diagram.

  FIG. 10 is a graph showing spectral distributions of the above-described spectral distribution 41 and spectral distribution 61 to spectral distribution 66 including spectral distributions similar to the spectral distribution 42 in which the D65 light source and the light source color are in substantially the same range. The spectral distribution 61 in FIG. 10 can be realized by a combination of the light source 1, the light source 2, and the light source 4. Similarly, the spectral distribution 62 is a combination of the light source 1, the light source 2, and the light source 5, the spectral distribution 63 is a combination of the light source 1, the light source 2, and the light source 6, and the spectral distribution 64 is a combination of the light source 1, the light source 3, and the light source 1. The combination of the light source 4, the spectral distribution 65 can be realized by a combination of the light source 1, the light source 3 and the light source 5, and the spectral distribution 66 can be realized by the combination of the light source 1, the light source 3 and the light source 6.

  FIG. 11 is a table showing light intensity values for each wavelength of the light sources 1 to 6 and the spectral distributions 61 to 66. FIG. 12 is a table showing the light intensity ratios of the light sources 1 to 6 that realize the spectral distribution 61 to the spectral distribution 66. FIG. 13 is a table showing chromaticity differences (ΔX, ΔY, ΔZ) of light source colors between the spectral distributions 61 to 66.

Here, an example in which the change in the object color of the DIC color guide is significant at the time of irradiation for each of the spectral distribution 61 to the spectral distribution 66 described above, that is, the value of the color difference ΔE ^* ab becomes large will be described below. The color patch used is the same as that shown in FIG.
Figure 14 is a tristimulus value of XYZ color system in the case where illuminated by 5 color patch spectral distribution 61 to the spectral distribution 66 of FIG. 6 L ^* a ^* b ^* was converted into colorimetric system L ^* a ^* It is a table | surface which shows the value of b ^* value.

Next, an example in which the value of the color difference ΔE ^* ab is large among the L ^* a ^* b ^* values shown in FIG.
FIG. 15A shows the L ^* a ^* b ^* values in the spectral distribution 63 and the spectral distribution 64, the difference values (ΔL ^* , Δa ^* , Δb ^* ), and the value of the color difference ΔE ^* ab. It is a table | surface which shows. FIG. 15B shows the L ^* a ^* b ^* values in the spectral distribution 63 and the spectral distribution 66, the difference values (ΔL ^* , Δa ^* , Δb ^* ), and the value of the color difference ΔE ^* ab. It is a table | surface which shows. FIG. 15C shows the L ^* a ^* b ^* values in the spectral distribution 63 and the spectral distribution 65, the difference values (ΔL ^* , Δa ^* , Δb ^* ), and the value of the color difference ΔE ^* ab. It is a table | surface which shows.

  In the above description, the range of the chromaticity difference that can be recognized by the observer as a similar color has been described as the range of (Expression 2). However, desirably, the same color is used in the range of (Expression 7) below. Has the effect of being recognized as

  More desirably, there is an effect that the same color is recognized in the range of the following (formula 8).

  More desirably, in the range of the following (formula 9), there is an effect that it is practically recognized as the same color.

  In the above, as an example of the different color range that the observer recognizes as different colors, the chromaticity difference (ΔX, ΔY, ΔZ) of the tristimulus values of the object between the respective illumination means is taken as an example (Equation 6). As described above, it is desirable that the following (Equation 10) range has an effect of being recognized as a different color.

  More desirably, there is an effect of being recognized as a different color in the range of the following (formula 11).

  More desirably, in the following range of (Expression 12), there is an effect that it is recognized as a practically different color.

  Next, an example of a method for controlling the light sources 1 to 6 when realizing an illumination unit having a light source color similar to that of the D65 light source using the spectral distributions 61 to 66 shown in FIG. Since the same control method can be applied to any of the spectral distributions 61 to 66, the illumination means of the spectral distribution 61 will be described as an example.

<Example of control method by always lighting>
FIG. 16 shows a timing chart when the light source 1, the light source 2, and the light source 4 constituting the spectral distribution 61 of FIG. In FIG. 16, the state where each light source is lit is shown in white. In this case, the light intensity ratio when the light source 1, the light source 2, and the light source 4 emit light is the ratio shown in FIG.
As a result, since the light source 1, the light source 2, and the light source 4 are all lit constantly, there is an effect that the observer does not feel flickering of the illumination light as compared with the case of blinking lighting.

<Example of control method by blinking lighting>
Next, an example in which the light source 1, the light source 2, and the light source 4 constituting the spectral distribution 61 of FIG. Here, the light intensity ratio when the light source 1, the light source 2, and the light source 4 emit light is the ratio shown in FIG. FIG. 17A shows an example of a timing chart of lighting of any one of the light source 1, the light source 2, and the light source 4 constituting the spectral distribution 61. In FIGS. 17A to 17D, a state where each light source is turned on is shown in white, and a state where each light source is turned off is shown by hatching.

  The frequency until the light source 2 is turned on after the light source 1 blinks may be 40 Hz (Hertz). The frequency until the light source 1 blinks and the light source 2 blinks and then the light source 4 is turned on, that is, the blinking frequency for two light sources among the three light sources is 40 Hz. More desirably, if the blinking frequency for the three light sources is 40 Hz, the observer can easily visually recognize as continuous lighting. In the case of blinking lighting, any blinking lighting frequency is applicable, not limited to 40 Hz, as long as it is equal to or higher than the critical fusion frequency that the observer recognizes as continuous lighting.

FIG. 17B shows an example of a timing chart when any one of the light source 1, the light source 2, and the light source 4 constituting the spectral distribution 61 is always turned on.
FIG. 17C shows an example of a timing chart in the case where any one of the light source 1, the light source 2, and the light source 4 constituting the spectral distribution 61 is always turned on.
FIG. 17D shows an example of a timing chart when one of the light sources 1, 2, and 4 constituting the spectral distribution 61 is always turned on.

In any of FIGS. 17B to 17D, the blinking frequency is not limited to 40 Hz as long as it is equal to or higher than the critical fusion frequency that the observer recognizes as continuous lighting, as in FIG. 17A. It is possible to apply even the flickering frequency of.
Further, the blinking frequency of each light source may be different from each other, for example, the blinking frequency of the light source 1 is 40 Hz, the blinking frequency of the light source 2 is 50 Hz, and the blinking frequency of the light source 4 is 60 Hz. In this case, the light quantity ratio of each light source, that is, the light intensity ratio of each light source is the ratio shown in FIG.
As a result, the light source 1, the light source 2, and the light source 4 are blinked at a frequency equal to or higher than the critical fusion frequency, so that there is an effect that the observer does not feel flickering of the illumination light as in the case of always lighting.

<Light source color control method by emission intensity>
In the embodiment described above, the light intensity values of the light source 1 to the light source 6 have been described by taking as an example the case where the luminance value Y is assumed to be 100. For example, the light intensity is output by one light source element for each type of light source. A method of controlling the light source provided in the illumination unit when there is a difference in possible luminance values will be described.
In FIG. 18A, for example, when any one of the light source 1, the light source 2, and the light source 4 is lit at a constant period, the ratio of luminance values that can be emitted by one LED element is 1: 2: 3. The example of the blinking pattern in case of being is shown. 18A to 18C, the state where each light source is turned on is indicated by white, and the state where each light source is turned off is indicated by hatched hatching.

  At this time, for example, in order for the observer to recognize the light source color of the illumination unit as a light source color substantially equal to the D65 light source, the light amount ratio of each light source that the illumination unit has, that is, the light intensity ratio of each light source is shown in FIG. The light emission intensity ratio in one lighting of the light source 1, the light source 2, and the light source 4 is calculated so as to be the ratio shown, and the light source 1, the light source 2, and the light source 4 are blinked by the calculated light intensity ratio value. Thus, the light intensity of each light source can be controlled.

Thereby, there is an effect that the light source color of the illumination unit can be controlled. Here, the D65 light source has been described as an example. However, the present invention is not limited to this, and a plurality of light sources combined as illumination means may be plotted on the xy chromaticity diagram and within a range surrounded by plot points of the plurality of light sources. For example, it is possible to provide an illumination unit that realizes an arbitrary light source color.
The value of the light intensity is a value indicated by a unit such as candela (Cd).

<Light source color control method by lighting time>
FIG. 18B shows a case where the ratio of luminance values that can be emitted by one LED element in the light source 1, the light source 2, and the light source 4 is 1: 2: 3, as in FIG. An example of a blinking pattern is shown.

  At this time, for example, in order for the observer to recognize the light source color as substantially the same as the D65 light source, the light source 1 and the light source 1 so that the light intensity ratio of each light source, that is, the light intensity ratio of each light source becomes the ratio shown in FIG. The lighting time for each lighting of the light source 2 and the light source 4 is calculated, and the light intensity of each light source is controlled by blinking based on the emission time of the light source 1, the light source 2, and the light source 4 by the calculated value. Is possible. Thereby, there is an effect that the light source color of the illumination unit can be controlled.

  In addition, you may combine the control method by Fig.18 (a) and FIG.18 (b). That is, as shown in FIG. 18C, the light intensity of each light source of the light source 1, the light source 2, and the light source 4 is adjusted so that the light intensity ratio of each light source becomes the ratio shown in FIG. One lighting time may be calculated, and the intensity ratio of each light source may be controlled by the calculated lighting time ratio value between the respective light sources. Thereby, there is an effect that the light source color of the illumination unit can be controlled.

In the present embodiment, the illumination unit having different spectral distributions but having substantially the same light source color has been described as a configuration of three light sources. However, as shown in the chromaticity diagram of FIG. The light source applied to the means 20 can be realized as long as one of the light sources is two or more. That is, a straight line passing through the reference numeral 71 and the reference numeral 72 by any of the illumination means combining the light source indicated by reference numeral 71 and the light source indicated by reference numeral 72 and the illumination means combining the light source indicated by reference numeral 73 and the light source indicated by reference numeral 74. Illuminating light having the light source color indicated by the intersection 90 between the line 73 and the line passing through the line 74 can be realized.
Moreover, although the illuminating device 100 is provided with the two illumination means of the illumination means 10 and the illumination means 20, although it is different spectral distribution, it is provided with the 3 or more illumination means used as a substantially equal light source color. Also good.

  According to the illumination means in the illumination device of the present embodiment described above, for example, in an amusement facility or the like, as shown in FIG. 20, an illumination device having any one of the spectral distributions 61 to 66 in FIG. It can be used for installation facilities. Then, a player who is given a unique card on which a plurality of color patches are printed can provide a new attraction such as searching for a lighting device in which the object color of the color patch changes.

  Furthermore, the lighting device of this embodiment can also be used as a lighting device for merchandise display shelves and reach incubators provided in stores and the like. At this time, for example, an object color of a product printed with a plurality of colors including a color having a spectral reflectance distribution of the color number “107” may be partially changed by switching between the illumination unit 10 and the illumination unit 20. It has the effect of making it possible for consumers who are observers to recognize the change. Thereby, a consumer's attention level to the displayed goods, ie, eye catching property, can be improved.

  Moreover, it is possible to use a color material whose tristimulus value of the object color is largely changed by the lighting device of the present embodiment as a product package. Thereby, it is possible to provide a product package with high eye-catching properties corresponding to the lighting device, and the need for the product package corresponding to the lighting device is increased, and it becomes possible to create a market for the product package. effective.

<Application example 1>
Next, as application example 1 and application example 2, application examples for building materials such as walls and floors having a large area in an indoor living space will be described.
Further, as shown in FIG. 21, when the illumination means 10 is always lit, observation is performed when the spotlight-like illumination means 20 is irradiated onto the floor having the spectral reflection characteristic of the color number “107” described above. For the person, although the illumination means 10 and the illumination means 20 are recognized as substantially the same light source color, it is possible to recognize that the color of the spotted spot has suddenly changed greatly. This has the effect of attracting the attention of the observer and giving surprises, and the effect of being able to provide new advertising means. Also, for example, the observer recognizes whether or not the furniture having a spectral reflection characteristic of the color number “107” installed in the room is irradiated with the spotlight-like illumination means 20. There is an effect that the color of the furniture, that is, the object color of the furniture can be switched.

In addition, the above-described application example 1 may be applied to a merchandise display shelf or a reach incler provided in a convenience store or the like.
As in FIG. 21, when the illumination means 10 is always lit, when the spotlight-like illumination means 20 is irradiated to the beverage can or the like having the spectral reflectance distribution of the color number “107” described above, the observer Therefore, although the illumination means 10 and the illumination means 20 are recognized as substantially the same light source color, it is possible to recognize that the color of the spotted spot has suddenly changed greatly. There is an effect that it is possible to attract the attention of a person or give a surprise, and it is possible to provide a new sales promotion means.

<Application example 2>
As application example 2, for example, a color material having the spectral reflection characteristic of the color number “107” described above can be applied to indoor wallpaper.
For example, when the wallpaper is irradiated by the lighting means 10 included in the lighting apparatus 100 of FIG. 1, the (L ^* , a ^* , b ^* ) values of the wallpaper are light blue (for example, based on JIS), as shown in FIG. It becomes a value (58.72, 10.33, −33.03) that can be recognized by the observer such as a color close to the common color name “hyacinth”.

On the other hand, when the wallpaper is irradiated by the illumination unit 20 shown in FIG. 1, the (L ^* , a ^* , b ^* ) values of the wallpaper are dull pink (for example, a conventional color name based on JIS), as shown in FIG. It is a value (65.58, 36.01, −20.74) that can be recognized by the observer, such as “color close to the iris color”.
Thus, for example, in the summer, the above-mentioned wallpaper is irradiated by the illumination light of the illumination means 10 of the illumination device 100, thereby giving a cool impression of a cool color system. In the winter, the wallpaper is applied by the illumination light of the illumination means 20. By irradiating, it is possible to provide a living space that gives the observer a warm impression of warm colors.

The color of the floor, wall, and ceiling described above greatly affects the overall impression of the room because the ratio of the area occupied in the room is large. Accordingly, the illumination means 10, the illumination means 20, and the color material with the color number “107” as described above are not limited to the case where the value of the color difference ΔE ^* ab is large, and the illumination having a smaller color difference ΔE ^* ab. Even the combination of the means and the color material has the effect that the impression given to the observer can be greatly changed.

In addition, the switching of the lighting means is not limited to the switching of the seasons as described above, but by switching for each scene (scene, situation) in which the room is used, such as at the time of visitor or relaxing time, It is also possible to change the indoor atmosphere by changing the color of the ceiling or the like. In this case, it is possible to make an indoor observer visually recognize a color change of three or more colors by using a lighting device including three or more lighting units instead of two lighting units.
In the above-described embodiment, the conventional color name based on JIS is a color name defined in “JIS Z 8102: 2001“ color name of object color ””.

It is a figure which shows the whole structure of the illuminating device 100 by one Embodiment of this invention. It is a graph which shows the spectral distribution by the illumination means 10 and the illumination means 20 by the embodiment. It is a graph which shows the spectral distribution by the light sources 11-13 with which the illumination means 10 by the same embodiment is provided, and the light sources 14-16 with which the illumination means 20 is provided. It is a graph which shows the color matching function in 10 degree | times visual field by CIE. It is a table | surface which shows the value of the light intensity for every wavelength in the color matching function in the illumination means 10, the illumination means 20, and the light sources 11-16 in one Embodiment, and a 10 degree | time visual field. It is a table | surface which shows the value of the spectral reflectance distribution of the 5 colors selected from the DIC color guide, and the value of the spectral reflectance distribution for every wavelength. It is a table | surface which shows L ^* a ^* b ^* value and color difference (DELTA ⁾ E ^* ab at the time of irradiating with the illumination means 10 and the illumination means 20 5 colors selected from the DIC color guide. It is a graph which shows the spectral distribution by the light sources 1-6. It is the graph which plotted the light source 1-the light source 6 on the xy chromaticity diagram. It is a graph which shows the spectral distribution of the spectral distribution 61-spectral distribution 66 whose light source color is substantially equal to a D65 light source. It is a table | surface which shows the light intensity value for every wavelength of the light source 1-the light source 6, and the spectral distribution 61-the spectral distribution 66. FIG. It is a table | surface which shows the light intensity ratio of the light source 1-the light source 6 which implement | achieves the spectral distribution 61-spectral distribution 66. FIG. It is a table | surface which shows the chromaticity difference ((DELTA) X, (DELTA) Y, (DELTA) Z) of the light source color between the spectral distributions 61-66. It is a table | surface which shows the value of the L ^* a ^* b ^* value at the time of illuminating the color patch of 5 colors of FIG. L ^* a ^* b ^* values of spectral distribution 63 and spectral distribution 64, spectral distribution 63 and spectral distribution 65, spectral distribution 63 and spectral distribution 66, and their differences (ΔL ^* , Δa ^* , Δb ^* ), and It is a table | surface which shows the value of color difference (DELTA ⁾ E ^* ab. It is a timing chart in case the light source 1, the light source 2, and the light source 4 which comprise the spectral distribution 61 are always lighted and a light source color is controlled. It is a timing chart in case the light source 1, the light source 2, and the light source 4 which comprise the spectral distribution 61 are made to blink and control a light source color. It is a timing chart in the case of controlling the light source color by changing the light intensity and the light emission time length when the light source 1, the light source 2, and the light source 4 constituting the spectral distribution 61 are turned on and off. It is an xy chromaticity diagram in case the light source which an illumination means has is two light sources. It is the figure which showed the case where this invention is applied to an amusement facility. It is the figure which showed the example of application of this invention.

Explanation of symbols

1, 2, 3, 4, 5, 6, 11, 12, 13, 14, 15, 16 Light source 10, 20 Illumination means 41, 42, 43, 44, 45, 46, 51, 52, 53, 54, 55 56, 61, 62, 63, 64, 65, 66 Spectral distribution 100 Illumination device

Claims (11)

An illumination device comprising: first illumination means for illuminating with a first light source color having a first spectral distribution; and second illumination means for illuminating with a second light source color having a second spectral distribution,
The first spectral distribution is different from the second spectral distribution,
A lighting device, wherein a value of a first chromaticity difference between the first light source color and the second light source color is a first predetermined range within the same color allowable range. The value of the first chromaticity difference between the first light source color and the second light source color is:
A first tristimulus value represented by three values of X, Y, and Z calculated by integration based on the first spectral distribution and the color matching function, the second spectral distribution, and the color matching function And a first chromaticity difference that is a difference value from the second tristimulus value calculated by integration based on
2. The lighting device according to claim 1, wherein ΔX, ΔY, and ΔZ that are values of the first chromaticity difference are within a range of the following expression.

In a wavelength region where the first spectral distribution and the second spectral distribution are different,
The second chromaticity difference between the first object color of the illumination target object when illuminated with the first light source color and the second object color of the illumination target object when illuminated with the second light source color The lighting device according to claim 1, wherein the value is a second predetermined range within a different color range. The value of the second chromaticity difference between the first object color and the second object color is:
It is expressed by three values of X, Y, and Z calculated by integration based on the product of the third spectral distribution of the light reflected by the object to be illuminated and the color matching function when illuminated by the first light source color. And the third tristimulus value to be integrated and calculated based on the product of the fourth spectral distribution of the light reflected by the illumination target object when illuminated by the second light source color and the color matching function A second chromaticity difference that is a difference value from the fourth tristimulus value
The absolute values of ΔX, ΔY, and ΔZ that are the second chromaticity difference values | ΔX |, | ΔY |, and | ΔZ | are within the range of the following expression: The lighting device described.

2. The lighting device according to claim 1, wherein one or both of the first lighting unit and the second lighting unit includes a plurality of light sources having different light source colors. The light intensity ratio between the plurality of light sources with different light source colors provided in the first illumination means or the second illumination means is set so that the value of the first chromaticity difference is within the same color tolerance range. The lighting device according to claim 5, wherein The lighting time ratio between the plurality of light sources having different light source colors provided in the first illumination means or the second illumination means is set so that the value of the first chromaticity difference is within the same color allowable range. The lighting device according to claim 5, wherein   2. The lighting device according to claim 1, wherein one or both of the first lighting unit and the second lighting unit are always lit. 2. The lighting device according to claim 1, wherein either or both of the first lighting unit and the second lighting unit are set to have a lighting frequency that is blinking or higher than a critical fusion frequency. The first spectral distribution or the second spectral distribution is:
The illumination device according to claim 1, comprising ultraviolet light. A second illumination means for use with the first illumination means for illuminating with a first light source color having a first spectral distribution,
Illuminating with a second light source color having a second spectral distribution;
The second spectral distribution is a spectral distribution different from the first spectral distribution,
The second illumination unit, wherein the second light source color is a first predetermined range in which a value of a chromaticity difference from the first light source color is within the same color allowable range.

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