JP2009048989A - Illumination apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an illumination apparatus which can show a red or green color more clearly in accordance with color components of an illumination object. <P>SOLUTION: The illumination apparatus is provided with a light source portion 12 with a light source for irradiating at least two kinds out of a red color light, a green color light and a blue color light of different peak wavelengths, an image sensor 13 photographing an illumination object 11 to which light from the light source portion 12 is illuminated, a color information abstracting means 14 to abstract color information from the image photographed by the image sensor, a color component calculating means 15 to calculate a component ratio of a red color component and a green color component from the color information abstracted at the color information abstracting means, a light source combination deciding means 16 for deciding a combination of the light sources for lighting up the light source portion based on compared results between the red color component ration and the green color component ratio which are calculated by the color component calculating means, and a lighting controlling means 17 for controlling a lighting of the light source portion by the combination of light sources which are decided by the light source combination deciding means 16. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an illuminating device that makes a color of an object irradiated with light more vivid.

  For example, as an object to be irradiated with light, food such as fresh meat and fresh fish is vividly rendered by removing yellowing, and has the effect of appearing fresh. For this reason, neodymium bulbs that mix neodymium in the bulbs of incandescent bulbs and absorb the emission energy of the yellow component having a peak wavelength near 580 nm have already been sold by lighting manufacturers. This effect is also known to be equivalent in other illumination lamps such as fluorescent lamps.

In addition, the lighting color environment can be evaluated based on the conspicuous index developed from the concept of conspicuousness, and indoor flowers, plants, etc. are reproduced in favorable colors, and the indoor lighting color environment is further improved. There are lamps and lighting fixtures (see, for example, Patent Document 1). That is, this defines a conspicuous index that makes the four-color test colors look vivid, and makes these colors look good.
Japanese Patent No. 3040719

  However, the neodymium bulb and the illumination device disclosed in Patent Document 1 irradiate an object with a fixed single color light, and thus cannot cope with a change in the object to be illuminated. For example, when the object has a large amount of red component such as fresh meat, it is preferable to make red appear more vivid, and when the object has a larger amount of green component such as vegetable, it is preferable to display green more vividly. Similarly, when the object has a large blue component such as a blue fish, it is preferable to make the blue appear more vivid, and when the object has a large yellow component such as lemon or orange, the yellow becomes more vivid. It is preferable to show.

  The objective of this invention is providing the illuminating device which can show red, green, blue, or yellow more vividly according to the color component of the illumination target object.

  The illumination device according to the invention of claim 1 is a light source that emits at least two types of red light having different peak wavelengths, a light source that emits at least two types of green light having different peak wavelengths, and at least two types having different peak wavelengths. A light source unit that emits blue light; an image sensor that captures an object illuminated by light from the light source unit; and color information extraction that extracts color information from an image captured by the image sensor Means for calculating a component ratio of a red component and a green component from the color information extracted by the color information extraction unit; a red component ratio and a green component ratio calculated by the color component calculation unit; A light source combination determining unit that determines a combination of light sources to be turned on based on the comparison result; and lighting control of the light source unit by a combination of light sources determined by the light source combination determining unit Characterized by comprising a; a lighting control unit.

  In the present invention and the following inventions, definitions and technical meanings of terms are as follows unless otherwise specified.

  The light source unit includes at least two types of light sources having different peak wavelengths for each of the three light colors of red light, green light, and blue light. Each light source may be an LED, or a discharge lamp coated with a phosphor that emits red light, green light, and blue light.

  The image sensor is composed of a CCD or CMOS sensor provided with, for example, an RGB color filter or an XYZ filter.

  The color information extraction unit, the color component calculation unit, the light source combination determination unit, and the lighting control unit include, for example, a microcomputer, a microprocessor, a CPU (Central Processing Unit) or a DSP (Digital Signal Processor).

  The color information includes hue and brightness (gradation value). The component ratio between the red component and the green component refers to, for example, the ratio of the red component pixel and the ratio of the green component pixel to the pixels of the entire captured image.

  “Combination of light sources that turn on the light source unit” means red light, green light selected from one of at least two light sources having different peak wavelengths of red light, green light, and blue light. A combination of light and blue light. The lighting control is allowed to include the color temperature around the object and the light mixture ratio of each light color.

  According to a second aspect of the present invention, there is provided the lighting device according to the first aspect, wherein the light source combination determining means includes a combination of a light source having a peak on the short wavelength side and a peak on the long wavelength side among the light sources of each light color. A light source combination having a light source having a peak on the long wavelength side when the red component ratio calculated by the color component calculation means is greater than the green component ratio, and the color component calculation means When the calculated green component ratio is larger than the red component ratio, a combination of light sources having a peak on the short wavelength side is determined.

  The present invention creates a combination of light sources having a peak on the short wavelength side and a combination of light sources having a peak on the long wavelength side among the light sources of the respective light colors as the “combination of light sources that light the light source section”. It is a thing. That is, for each light color of red light, green light, and blue light, it has a light source having a peak on the short wavelength side and a light source having a peak on the long wavelength side, and each light color of red light, green light, and blue light Both are a combination of a light source having a peak on the short wavelength side and a combination of a light source having a peak on the long wavelength side for each light color of red light, green light, and blue light.

  If the red component ratio calculated by the color component calculation means is larger than the green component ratio, a combination of light sources having a peak on the long wavelength side is determined, and the green component ratio calculated by the color component calculation means is the red component. If the ratio is larger than the ratio, the combination of light sources having a peak on the short wavelength side is determined.

  A lighting device according to a third aspect of the present invention is the lighting device according to the first or second aspect, wherein the peak wavelength of the spectral distribution of the light source that emits red light is between 615 nm and 675 nm, and the spectral distribution of the light source that emits green light. The peak wavelength of the light source is between 515 nm and 555 nm, and the peak wavelength of the spectral distribution of the light source that emits blue light is between 435 nm and 485 nm.

  In the present invention, the range of the peak wavelength of each light color of red light, green light, and blue light is specified.

  An illumination device according to a fourth aspect of the invention includes a light source unit having a light source that emits at least red light, green light, blue light, and yellow light; and an image that captures an object illuminated by light from the light source unit. A sensor; color information extraction means for extracting color information from an image taken by the image sensor; and calculating component ratios of red, green, blue and yellow components from the color information extracted by the color information extraction means Color component calculation means for performing light source combination determination means for determining a combination of light sources to be turned on based on a comparison result of a mixed component ratio of red and green components and a mixed component ratio of blue and yellow components A light mixture ratio calculating means for calculating the light mixture ratio of the light sources determined by the light source combination determining means; and a lighting control means for controlling lighting of the light source unit with the light mixture ratio calculated by the light mixture ratio calculating means; With And wherein the door.

  The light source unit has at least four light sources for each of the four light colors of red light, green light, blue light, and yellow light. Each light source may be an LED, or a discharge lamp coated with a phosphor that emits red light, green light, blue light, and yellow light.

  The image sensor is composed of a CCD or CMOS sensor provided with, for example, an RGB color filter or an XYZ filter.

  The color information extraction unit, the color component calculation unit, the light source combination determination unit, the light mixture ratio calculation unit, and the lighting control unit are, for example, a microcomputer, a microprocessor, a CPU (Central Processing Unit) or a DSP (Digital Signal Processor). Composed.

  The color information includes hue and brightness (gradation value). The component ratio of the red component, the green component, the blue component, and the yellow component is, for example, the ratio of the red component pixel to the pixels of the entire captured image, the ratio of the green component pixel, the ratio of the blue component pixel, and the yellow component. This is the pixel ratio.

  “Combination of light sources that light the light source unit” means red light, green light, red light, green light, blue light selected from three light sources among red light, green light, blue light, and yellow light, A combination of three colors of blue light, or a combination of four colors of red light, green light, blue light, and yellow light in which four light sources of red light, green light, blue light, and yellow light are selected.

  The light mixture ratio is, for example, the intensity ratio of red light, green light, and blue light when three light sources of red light, green light, and blue light are selected, and the light mixture ratio is set. Depending on the situation, white light may be used. In addition, when four light sources of red light, green light, blue light, and yellow light are selected, the intensity ratio of red light, green light, blue light, and yellow light is used. It may be white light.

  The lighting control is allowed to include the color temperature around the object and the light mixture ratio of each light color.

  According to a fifth aspect of the present invention, there is provided the lighting device according to the fourth aspect, wherein the light source combination determining means compares the mixing ratio of the red component and the green component with the mixing ratio of the blue component and the yellow component, When the mixing ratio of the green component is greater than or equal to the mixing ratio of the blue component and the yellow component, it is a combination of light sources that emit red light, green light, and blue light, and the mixing ratio of the red component and the green component is that of the blue component and the yellow component. When it is smaller than the mixing ratio, it is a combination of light sources that emit red light, green light, blue light, and yellow light.

  In the present invention, as a “combination of light sources for turning on a light source unit”, when an irradiation object contains a lot of red and green components, red light, green light, and blue light are used to make red and green appear vividly. If the object to be irradiated contains a large amount of blue and yellow components, red, green, blue, and yellow light are emitted to make the blue and yellow appear vivid. This is a combination of four light sources.

  A lighting device according to a sixth aspect of the present invention is the lighting device according to the fourth or fifth aspect, wherein the peak wavelength of the spectral distribution of the light source that emits red light is between 615 nm and 675 nm, and the spectral distribution of the light source that emits yellow light. The peak wavelength of the light source that emits green light is between 515 nm and 555 nm, the peak wavelength of the light source that emits blue light is between 435 nm and 485 nm. It is characterized by being in between.

  In the present invention, the range of each peak wavelength of each light color of red light, green light, blue light, and yellow light is specified.

  A lighting device according to a seventh aspect of the invention is characterized in that, in the invention according to any one of the fourth to sixth aspects, the proportion of the yellow light does not exceed 35% of the total light mixture.

  When red light, green light, and blue light are mixed with yellow light, blue light and yellow light become vivid, but when the mixing ratio of yellow light increases, red light and green light become dull color. Become. Therefore, in order to keep blue light and yellow light clearer while maintaining the vividness of red light and green light than a three-wavelength fluorescent lamp, the ratio of yellow light does not exceed 35% of the total light mixture. It is.

  According to the invention of claim 1, among the plurality of colors included in the object to be illuminated, a combination of light sources that is turned on when the red component is greater than the green component and when the green component is greater than the red component. Therefore, even if the object changes, it becomes possible to make the object appear vividly according to the color of the object to be illuminated.

  According to the invention of claim 2, in addition to the effect of the invention of claim 1, when there are many red components among the plurality of colors included in the object to be illuminated, the combination of the light source having a peak wavelength on the long wavelength side and As a result, red is displayed more vividly, and when the green component is large, the combination of light sources having shorter peak wavelengths is used, so that green can be displayed more vividly.

  According to claim 3, in addition to the effect of the invention of claim 1 or 2, by specifying the peak wavelength of each light color within a certain range, it is possible to accurately show red or make green more vivid. Can show.

  According to invention of Claim 4, in addition to the light source of red light, green light, and blue light, the light source of yellow light is provided, and among a plurality of colors included in the object to be illuminated, red component, green component, blue color Since the combination of the light sources to be lit is determined by the ratio of the component and the yellow component, it is possible to make the irradiation object look vivid even when the irradiation object changes.

  According to the invention of claim 5, in addition to the effect of the invention of claim 4, when the mixing ratio of the red component and the green component is equal to or higher than the mixing ratio of the blue component and the yellow component, red light, green light, blue light As the combination of light sources that irradiate the light, red and green can be seen vividly. When the mixing ratio of the red and green components is smaller than the mixing ratio of the blue and yellow components, add a yellow light source. Since the combination of light sources that emit red light, green light, blue light and yellow light is used, blue and yellow can be seen vividly.

  According to the invention of claim 6, in addition to the effect of the invention of claim 4 or 5, by specifying the peak wavelength of each light color within a certain range, while maintaining the vividness of red and green, Can show yellow and vividly.

  According to the invention of claim 7, since the ratio of yellow light does not exceed 35% of the whole, blue light and yellow light are brightened while maintaining the vividness of red light and green light from the three-wavelength fluorescent lamp. Can show.

  FIG. 1 is a configuration diagram of an illumination apparatus according to the first embodiment of the present invention. The light source unit 12 that irradiates light to the illumination target 11 includes light sources that irradiate light of three colors of RGB (red, green, and blue). The red light source 18a, the green light source 18b, and the blue light source 18c are And at least two light sources having different peak wavelengths. Accordingly, the light source unit 12 includes at least six types of light sources 18a1, 18a2, 18b1, 18b2, 18c1, and 18c2.

  FIG. 2 is a spectral distribution diagram of each of the light sources 18a1, 18a2, 18b1, 18b2, 18c1, and 18c2 of the light source unit 12. In FIG. 2, each of the red light source 18a, the green light source 18b, and the blue light source 18c has two types of light sources having different peak wavelengths, and six types of light sources 18a1, 18a2, 18b1, 18b2, 18c1, The case of having 18c2 is shown. In the following description, each of the red light source 18a, the green light source 18b, and the blue light source 18c has two types of light sources having different peak wavelengths, and six types of light sources 18a1, 18a2, 18b1, 18b2, and 18c1 as a whole. , 18c2 will be described.

  Two types of light sources having different peak wavelengths within the same hue range of red, green, and blue are prepared so that green or red can be seen vividly while suppressing a deviation in hue. The red light has two types of peak wavelengths from 615 nm to 675 nm, the green light has two types of peak wavelengths from 515 nm to 555 nm, and the blue light has two types of peak wavelengths from 435 nm to 485 nm.

  As shown in FIG. 2, in the first embodiment of the present invention, the red light source is a light source R1 having a peak wavelength of about 630 nm and a light source R2 having a peak wavelength of about 660 nm, and the green light source has a peak wavelength. A light source G1 having a wavelength of about 530 nm and a light source G2 having a peak wavelength of about 545 nm are used, and a blue light source is a light source B1 having a peak wavelength of about 450 nm and a light source B2 having a peak wavelength of about 470 nm.

  Note that the peak wavelength of each light source may be shifted by about ± 15 nm in a state where the magnitude relationship of the wavelengths is maintained.

  Next, the image sensor 13 obtains an image by photographing the illumination object 11 illuminated by the light from the light source unit 12, and the image obtained by the image sensor 13 is input to the color information extraction unit 14. . The color information extraction means 14 extracts color information from the image photographed by the image sensor 13.

  As a method of extracting color information by the color information extracting means 14, the RGB gradation value of each pixel of the photographed image may be detected, or the image sensor 13 includes an XYZ filter approximating a CIE1931 color matching function. The xy chromaticity may be obtained at a plurality of points in the image.

  The color information extracted by the color information extraction unit 14 is input to the color component calculation unit 15, and the component ratio between the red component and the green component is calculated by the color component calculation unit 15. The calculation of the component ratio between the red component and the green component in the color component calculation means 15 is performed by comparing the R gradation value and the G gradation value when detecting the RGB gradation value, and an XYZ filter is provided. In the image sensor 13, when the xy chromaticity of the point for detecting the color is plotted on the chromaticity diagram, the number of points plotted in the red range and the green range is compared.

  The comparison result between the red component ratio and the green component ratio calculated by the color component calculation unit 15 is input to the light source combination determination unit 16. The light source combination determining unit 16 determines a combination of light sources to be turned on by the light source unit 12 based on a comparison result between the red component ratio and the green component ratio.

  The light source combination is a light source combination A having a peak on the short wavelength side and a light source combination B having a peak on the long wavelength side among the two types of light sources of red, green, and blue. That is, there are two combinations of the combination A of the red light source R1, the green light source G1, and the blue light source B1, and the combination B of the red light source R2, the green light source G2, and the blue light source B2. The light source combination A is a combination of wavelengths when the green color is intended to appear more vivid, and the light source combination B is a wavelength combination when the red color is intended to appear more vivid.

  When the red component ratio calculated by the color component calculating unit 15 is larger than the green component ratio, the light source combination determining unit 16 determines a light source combination B having a peak on the long wavelength side in order to make red appear vividly. When the green component ratio calculated by the color component calculation means 15 is larger than the red component ratio, the light source combination A having a peak on the short wavelength side is determined.

  Then, the lighting control unit 17 controls the lighting of the light source unit 12 with the combination of the light sources determined by the light source combination determining unit 16, and when the illumination object 11 is red, the illumination object 11 is more vividly red. When is green, the green color is illuminated more vividly.

Here, as an evaluation index to the extent that the color is vividly shown, it is described in an appendix of JISZ8726 for evaluating the subjective preference of color rendering (color appearance) (color rendering property evaluation method other than by color rendering index). Color gamut area ratio (hereinafter referred to as Ga). The color gamut area ratio Ga is an octagonal area obtained by plotting the chromaticities of test colors 1 to 8 shown in Table 1 defined in JISZ8726. It is represented by a relative value when the area by 100 is 100, and when it is larger than 100, the saturation is on the average and the color is expected to look more vivid.

  However, the test colors 1 to 8 are colors with relatively low chroma with 4 to 8 chroma. Therefore, in the first embodiment of the present invention, whether the color looks vivid or not is determined by using the square color gamut area S obtained by plotting the chromaticities of the test colors 9 to 12 having high saturation based on the reference light. Compared with the square color gamut area S0, the area ratio is defined as a color gamut area ratio Ga9-12.

  FIG. 3 shows test colors 9 to 12 when white light having a correlated color temperature of 5000 K is created by mixing light in the combination A of light sources having a peak on the short wavelength side and the combination B of light sources having a peak on the long wavelength side. It is a graph of the color coordinate.

  The white squares in FIG. 3 are the color coordinates of the test colors 9 to 12 when the light source combination A has a peak on the short wavelength side, and the black triangles are the test colors when the light source combination B has a peak on the long wavelength side. The color coordinates 9 to 12 and the black squares are the color coordinates of the test colors 9 to 12 under a reference light source which is a black body radiation of 5000K. The solid line A1 is a quadrangle obtained by plotting the test colors 9 to 12 for the light source combination A having a peak on the short wavelength side, and the dotted line B1 is the test color 9 for the light source combination B having a peak on the long wavelength side. A square obtained by plotting ~ 12 and a thick solid line C are squares obtained by plotting test colors 9 to 12 under a reference light source that is a black body radiation of 5000K.

  As can be seen from FIG. 3, the color coordinates of the test color 10 (yellow) and the test color 12 (blue) when illuminated with the light source combination A and the light source combination B are under the reference light source which is a black body radiation of 5000K. Since it is not greatly different from the color coordinates, the appearance of yellow and blue hardly changes even when either the light source combination A or the light source combination B is selected. On the other hand, when the test color 9 (red) is illuminated with the light source combination A and the light source combination B, the color coordinates are shifted in the direction away from the origin from the reference light in both cases. Although there is an effect of making it appear vivid, since the light source combination B is farther from the origin than the light source combination A, the red color can be seen more vividly. The test color 11 (green) is more vivid in green when illuminated with the light source combination A than with the light source combination B because the light source combination A is farther from the origin than the light source combination B. Can show.

  In other words, the red or green color of the object can be shown vividly with almost no change in the appearance of yellow and blue.

  Furthermore, when the reference light is 100, the color gamut area ratio Ga9-12 is about 174 for the light source combination A and about 192 for the light source combination B, and both combinations give the test colors 9 to 12 based on the reference light. There is an effect to show vividly.

  FIG. 4 shows test colors 9 to 12 when white light having a correlated color temperature of 3000 K is created by mixing light in a combination A of light sources having a peak on the short wavelength side and a combination B of light sources having a peak on the long wavelength side. It is a graph of the color coordinate.

  When white light having a correlated color temperature of 3000K is created, the same tendency as 5000K is observed as shown in FIG. That is, the color coordinates of the test color 10 (yellow) and the test color 12 (blue) when illuminated with the light source combination A and the light source combination B are greatly different from the color coordinates under the reference light source that is 3000K black body radiation. Therefore, it is considered that yellow and blue can be faithfully reproduced. On the other hand, when the test color 9 (red) is illuminated with the light source combination A and the light source combination B, the color coordinates are shifted in the direction away from the origin from the reference light in both cases. Although there is an effect of making it appear vivid, since the light source combination B is farther from the origin than the light source combination A, the red color can be seen more vividly. The test color 11 (green) is more vivid in green when illuminated with the light source combination A than with the light source combination B because the light source combination A is farther from the origin than the light source combination B. Can show. Further, the color gamut area ratio Ga9-12 is larger than the reference light in both the combination of the light source A and the combination B of the light source when the reference light is 100, so the test colors 9 to 12 are vividly displayed. There is an effect to show.

  Here, the lighting control means 17 sets a correlated color temperature in advance according to the environment where the irradiation object 11 is placed, and the light desired to be obtained by the mixed light of each light source of the light source unit 12 at the correlated color temperature. The light mixture ratio of each light source is calculated based on the color. Further, the lighting control means 17 may have a fade function so that the light source is switched slowly when the illumination object 11 is changed and the light source is switched.

  According to the first embodiment of the present invention, the illumination object 11 is photographed by the image sensor 13, color information included in the illumination object 11 is extracted, and a plurality of colors included in the illumination object 11 are extracted. When the red component is greater than the green component, the peak wavelength is a combination of light sources on the longer wavelength side, so the red color appears more vivid, and when there is more green component, the peak wavelength is the combination of light sources on the shorter wavelength side. So you can see green more vividly. That is, even if the irradiation object 11 changes, according to the color of the irradiation object 11, the color can be shown vividly.

  FIG. 5 is a block diagram of an illumination apparatus according to the second embodiment of the present invention. In the second embodiment, in contrast to the first embodiment shown in FIG. 1, in addition to making red and green appear vividly, blue and yellow are also made vivid. That is, the light source unit 12 includes a light source 18a that emits red light, a light source 18b that emits green light, a light source 18c that emits blue light, and a light source 18d that emits yellow light. Based on the comparison result between the mixed component ratio of the component and the green component and the mixed component ratio of the blue component and the yellow component, the combination of the light sources 18a, 18b, 18c, and 18d to be turned on is determined, and the light mixture ratio calculating means 19 calculates the light mixture ratio of the light sources determined by the light source combination determining means 16, and the lighting control means 17 controls the lighting of the light source section 12 with the light mixture ratio calculated by the light mixture ratio calculating means 19. It is. Thereby, when there are many red components or green components in the irradiation object 11, red light, green light, and blue light are mixed, and when there are many blue components or yellow components, red light, green light, blue light is mixed. In addition to light, yellow light is mixed.

  In FIG. 5, an image sensor 13 obtains an image by photographing the illumination object 11 illuminated with light from the light source unit 12, and the image obtained by the image sensor 13 is input to the color information extraction unit 14. The The color information extraction means 14 extracts color information from the image photographed by the image sensor 13.

  The color information extracting unit 14 extracts color information by, for example, detecting an RGB gradation value of each pixel of a photographed image and providing the image sensor 13 with an XYZ filter approximating a CIE1931 color matching function. Xy chromaticity is obtained at a plurality of points.

  For example, the red component, green component, blue component, and yellow component of the irradiation object 11 are extracted as follows. The RGB gradation value of each pixel of the photographed image can be acquired as a value from 0 to 255. Then, the RGB color system of the NTSC system is converted into the CIE color system using the conversion formula (1) (Color Science Handbook, Color Society of Japan, p. 988). X, Y, and Z are tristimulus values.

X = 0.0.667R + 0.1736G + 0.2001B
Y = 0.2998R + 0.5868G + 0.1144B (1)
Z = 0.0661G + 1.1150B
In this way, using the conversion formula of Formula (1), the RGB components averaged over the entire image or the area of the irradiation object 11 that is desired to be displayed vividly are converted into tristimulus values X, Y, Z, and further, tristimulus The values X, Y, and Z are converted to xy chromaticity.

  The color information extracted by the color information extraction unit 14 is input to the color component calculation unit 15, and the component ratio of the red component, the green component, the blue component, and the yellow component is calculated by the color component calculation unit 15. The calculation of the component ratio of the red component, green component, blue component, and yellow component by the color component calculation means 15 is performed by plotting the xy chromaticity of the point where the color is detected on the chromaticity diagram and the red range and the green component. Compare the number of points plotted in the range.

  The red component ratio, the green component ratio, the blue component ratio, and the yellow component ratio calculated by the color component calculation unit 15 are input to the light source combination determination unit 16. The light source combination determining means 16 compares the mixing ratio of the red component and the green component with the mixing ratio of the blue component and the yellow component, and determines the combination of the light sources to be turned on based on the comparison result. When the mixing ratio of the red component and the green component is equal to or higher than the mixing ratio of the blue component and the yellow component, the light source combination determining unit 16 vividly displays red and green since the irradiation object 11 includes a large amount of the red component and the green component. In order to show, the light sources 18a, 18b, and 18c that emit red light, green light, and blue light are combined.

  In addition, when the mixing ratio of the red component and the green component is smaller than the mixing ratio of the blue component and the yellow component, the irradiation object 11 contains a large amount of the blue component and the yellow component. A combination of light sources 18a, 18b, 18c, and 18d that emit light, green light, blue light, and yellow light is used.

  The light mixture ratio calculating means 19 calculates the light mixture ratio of the light sources 18a, 18b, 18c determined by the light source combination determining means 16, or the light mixture ratio of the light sources 18a, 18b, 18c, 18d. For example, when three light sources 18a, 18b, and 18c of red light, green light, and blue light are selected, the light mixture ratio is calculated so that the mixed light of red light, green light, and blue light becomes white light. To do. When four light sources 18a, 18b, 18c, and 18d of red light, green light, blue light, and yellow light are selected, the mixed light of red light, green light, blue light, and yellow light becomes white light. Calculate the light mixture ratio. The lighting control unit 17 controls the lighting of the light sources 18a, 18b, 18c, and 18d of the light source unit 12 with the light mixture ratio calculated by the light mixture ratio calculating unit 19.

  Next, taking the case where red light, green light, and blue light are mixed and the case where yellow light is further added as an example, the extent to which the color looks vivid will be described. As described above, since the test colors 1 to 8 are relatively low-saturation colors having a chroma of 4 to 8, even in the second embodiment of the present invention, whether or not the colors look vivid is determined by the saturation. The square color gamut area S obtained by plotting the chromaticities of the test colors 9 to 12 having a high degree is compared with the square color gamut area S0 of the reference light. Now, let the area ratio be the color gamut area ratio Ga9-12.

  FIG. 6 is a graph of the color coordinates of the test colors 9 to 12 when white light is created by the mixed light in the second embodiment. The black squares in FIG. 6 are the color coordinates of the test colors 9 to 12 when the peak wavelengths of the red light: 636 nm, the green light: 532 nm, and the blue light: 458 nm are mixed into white light, and the black triangle is Test colors 9 to 12 when the peak wavelengths are red light: 636 nm, yellow light: 589 nm, green light: 532 nm, blue light: 458 nm, and mixed with colored light that is 30% of the whole yellow light, resulting in white light. The white triangles are the color coordinates of the test colors 9 to 12 under the light source of the three-wavelength fluorescent lamp, and the black circles are the peak wavelengths of red light: 636 nm, yellow light: 589 nm, green light: 532 nm, and blue light: 458 nm, respectively. It is a color coordinate of the test colors 9-12 when mixing the color light which made 40% of the whole yellow light, and making it white light.

  The solid line D plots the test colors 9 to 12 (black squares) when RGB light is mixed into white light (RGB) with red light: 636 nm, green light: 532 nm, and blue light: 458 nm. When the obtained quadrilateral and two-dot chain line E has a peak wavelength of red light: 636 nm, yellow light (30%): 589 nm, green light: 532 nm, blue light: 458 nm, and mixed into white light (RGBY30) ) Of test colors 9 to 12 (black triangles) and a dashed line F are obtained by plotting test colors 9 to 12 under a light source of a three-wavelength fluorescent lamp (white triangles) and dotted line G When the peak wavelengths are red light: 636 nm, yellow light (40%): 589 nm, green light: 532 nm, and blue light: 458 nm are mixed into white light (RGBY4) ) Color coordinates of the test colors 9-12 (a rectangle obtained by plotting solid circles).

  In the color coordinate graph of FIG. 6, the color farther from the origin represents a brighter color. As can be seen from FIG. 6, since the solid line D (RGB) and the alternate long and two short dashes line E (RGBY30) are separated from the origin by the color coordinates of the respective color charts than the one-dot chain line (three-wavelength fluorescent lamp), It means that the color looks vivid.

  The solid line D (RGB) is light that the red and green colors look particularly vivid because the test colors 9 and 11 are farther from the origin than the two-dot chain line E (RGBY30), and the two-dot chain line E (RGBY30) is Since the test colors 9 and 11 are closer to the origin than the solid line D (RGB), the red and green colors are less vivid than the solid line D (RGB). However, regarding the test colors 10 and 11, the two-dot chain line E (RGBY30) is more distant from the origin than the solid line D (RGB), so it can be seen that blue and yellow appear vivid.

  Here, a dotted line G (RGBY40) in which yellow light is increased to 40% of the whole tends to be plotted closer to the origin than a one-dot chain line F (three-wavelength fluorescent lamp), that is, the color is vivid. Since it tends to be invisible, yellow light mixes so that it does not exceed 35% of the total. The light source is based on white light, and may add red light, green light, blue light, and yellow light, which changes the surrounding atmosphere compared to the case where only monochromatic light is mixed. It is possible to show only the illumination object vividly.

  Here, the lighting control means 17 sets a correlated color temperature in advance according to the environment where the irradiation object 11 is placed, and the light desired to be obtained by the mixed light of each light source of the light source unit 12 at the correlated color temperature. The light mixture ratio of each light source is calculated based on the color. Further, the lighting control means 17 may have a fade function so that the light source is switched slowly when the illumination object 11 is changed and the light source is switched.

  In the above description, the peak wavelengths of each color light are red light: 636 nm, yellow light (30%): 589 nm, green light: 532 nm, blue light: 458 nm, but the peak of the spectral distribution of the light source that emits red light. Blue light is emitted when the wavelength is between 615 nm and 675 nm, the peak wavelength of the spectral distribution of the light source emitting yellow light is between 555 nm and 615 nm, and the peak wavelength of the spectral distribution of the light source emitting green light is between 515 nm and 555 nm The peak wavelength of the spectral distribution of the light source may be between 435 nm and 485 nm.

  According to the second embodiment of the present invention, in addition to the light source of red light, green light, and blue light, the light source of yellow light is provided, and among the plurality of colors included in the illuminated object, the red component, Since the combination of the light sources to be lit is determined by the ratio of the green component, the blue component, and the yellow component, the irradiation target can be displayed vividly even if the irradiation target changes. In addition, when the mixing ratio of the red component and the green component is equal to or higher than the mixing ratio of the blue component and the yellow component, it is a combination of light sources that emit red light, green light, and blue light, so that red and green can be seen vividly. When the mixing ratio of the red component and the green component is smaller than the mixing ratio of the blue component and the yellow component, a light source for yellow light is added to irradiate red light, green light, blue light, and yellow light. Because it is a combination, blue and yellow can be seen vividly.

  Moreover, by specifying the peak wavelength of each light color within a certain range, it is possible to make the blue and yellow appear vivid while maintaining the vividness of red and green, and the proportion of yellow light is 35% of the total Therefore, blue light and yellow light can be clearly displayed while maintaining the vividness of red light and green light from the three-wavelength fluorescent lamp.

The block diagram of the illuminating device concerning the 1st Embodiment of this invention. The spectral distribution figure of each light source of the light source part in the 1st Embodiment of this invention. The color coordinate graph of the test colors 9-12 when it mixes so that it may become correlated color temperature 5000K white light in the 1st Embodiment of this invention. The graph of the color coordinate of the test colors 9-12 when light-mixing so that it may become correlated color temperature 3000K white light in the 1st Embodiment of this invention. The block diagram of the illuminating device concerning the 2nd Embodiment of this invention. The graph of the color coordinate of the test colors 9-12 at the time of producing white light by the light mixture in the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Illumination target object, 12 ... Light source part, 13 ... Image sensor, 14 ... Color information extraction means, 15 ... Color component calculation means, 16 ... Light source combination determination means, 17 ... Lighting control means, 18 ... Light source, 19 ... Mixed Optical ratio calculation means

Claims (7)

A light source that emits at least two types of red light having different peak wavelengths, a light source that emits at least two types of green light having different peak wavelengths, and a light source that emits at least two types of blue light having different peak wavelengths A light source unit;
An image sensor for photographing an object illuminated with light from the light source unit;
Color information extracting means for extracting color information from an image photographed by the image sensor;
Color component calculation means for calculating a component ratio of a red component and a green component from the color information extracted by the color information extraction means;
Light source combination determining means for determining a combination of light sources to be turned on by the light source unit based on a comparison result between the red component ratio and the green component ratio calculated by the color component calculating means;
Lighting control means for controlling lighting of the light source unit with a combination of light sources determined by the light source combination determining means;
An illumination device comprising:   The light source combination determining means creates a light source combination having a peak on the short wavelength side and a light source combination having a peak on the long wavelength side among the light sources of the respective light colors, and is calculated by the color component calculating means. When the red component ratio is greater than the green component ratio, the combination of light sources having a peak on the long wavelength side is determined, and when the green component ratio calculated by the color component calculation means is greater than the red component ratio, the short wavelength side The lighting device according to claim 1, wherein a combination of light sources having a peak at the center is determined.   The peak wavelength of the spectral distribution of the light source emitting red light is between 615 nm and 675 nm, the peak wavelength of the spectral distribution of the light source emitting green light is between 515 nm and 555 nm, and the spectrum of the light source emitting blue light 3. The illumination device according to claim 1, wherein a peak wavelength of the distribution is between 435 nm and 485 nm. A light source unit having a light source that emits at least red light, green light, blue light, and yellow light;
An image sensor for photographing an object illuminated with light from the light source unit;
Color information extracting means for extracting color information from an image photographed by the image sensor;
Color component calculation means for calculating a component ratio of a red component, a green component, a blue component and a yellow component from the color information extracted by the color information extraction means;
Light source combination determining means for determining a combination of light sources to be lit by the light source unit based on a comparison result between a mixed component ratio of the red component and the green component and a mixed component ratio of the blue component and the yellow component;
A light mixture ratio calculating means for calculating a light mixture ratio of the light sources determined by the light source combination determining means;
Lighting control means for controlling lighting of the light source unit with the light mixture ratio calculated by the light mixture ratio calculating means;
An illumination device comprising:   The light source combination determining means compares the mixing ratio of the red and green components with the mixing ratio of the blue and yellow components, and when the mixing ratio of the red and green components is equal to or higher than the mixing ratio of the blue and yellow components. Red light, green light, blue light, and yellow light when the mixture ratio of red and green components is less than that of blue and yellow components. The illumination device according to claim 4, wherein the illumination device is a combination of light sources that emit light.   The peak wavelength of the spectral distribution of the light source that emits red light is between 615 nm and 675 nm, the peak wavelength of the spectral distribution of the light source that emits yellow light is between 555 nm and 615 nm, and the spectrum of the light source that emits green light 6. The illumination device according to claim 4, wherein the peak wavelength of the distribution is between 515 nm and 555 nm, and the peak wavelength of the spectral distribution of the light source that emits blue light is between 435 nm and 485 nm.   The lighting device according to any one of claims 4 to 6, wherein the ratio of the yellow light does not exceed 35% of the total mixed light.

Images