JP2021163596A - Light-emitting module and lighting device - Google Patents

Abstract

To provide a light-emitting module that allows texture of an object to appear properly, and to provide a lighting device.SOLUTION: A light-emitting module includes: a first light-emitting element for emitting white light with a first peak wavelength of 500 nm or less; and a second light-emitting element for emitting monochromatic light with a second peak wavelength of 650 nm or more and 700 nm or less. Color rendering property of light emitted from the first light-emitting element and color rendering property of mixed-color light emitted from the first light-emitting element and the second light-emitting element are classified to the same segment.SELECTED DRAWING: Figure 1

Description

Embodiments of the present invention relate to light emitting modules and lighting devices.

In recent years, the replacement of the light source of the lighting device with an LED (Light Emitting Diode) has been progressing, but in general, the LED light source is configured to output a large amount of light of a color that can be perceived by humans in order to improve efficiency. Has been done. Therefore, when an object is illuminated by an LED light source illuminating device, the same object may be visually recognized with a strange color as compared with the case where the same object is illuminated with sunlight (daylight). As a solution for this purpose, a configuration for increasing the average color rendering index Ra and the color rendering index R9 to R15 is being studied. However, in a configuration in which the average color rendering index Ra and the color rendering index R9 to R15 are simply increased, the color looks relatively preferable due to the high color rendering property, but there is a problem that the original texture of the object is not transmitted. there were.

JP-A-2015-130362

An object to be solved by the present invention is to provide a light emitting module and a lighting device capable of appropriately showing the texture of an object.

The light emitting module of the embodiment has a first light emitting element having a first peak wavelength of 500 nm or less and irradiating white light, and a second light emitting element having a second peak wavelength of 650 nm or more and 700 nm or less and irradiating monochromatic light. It is equipped with a light emitting element of. The color rendering index of the light emitted from the first light emitting element is the same as the color rendering index of the mixed color light of the first light emitting element and the second light emitting element.

According to the embodiment, it can be expected to provide a light emitting module and a lighting device capable of appropriately showing the texture of an object.

It is a perspective view of the lighting apparatus which shows one Embodiment. It is a block diagram of the light emitting module of the lighting apparatus which shows one Embodiment. It is a graph which shows the color matching function. It is a top view which shows the light emitting module of the lighting apparatus which shows one Embodiment. It is a spectrum of the conventional light used in the visibility evaluation test. It is a spectrum of light which is an example of this embodiment used in a visibility evaluation test. This is the result of a visibility evaluation test using a paper color sheet as an evaluation sample. This is the result of a visibility evaluation test using a cloth color tag as an evaluation sample. This is the result of a visibility evaluation test using the back of the hand as an evaluation sample. This is the result of a visibility evaluation test using the back of the arm of the subject who applied the makeup base as an evaluation sample. This is an example of the spectrum of light emitted from the first light source corresponding to the color rendering index AAA. It is a graph which shows the transition of the color rendering index evaluation number (Ra, R9) when the 2nd peak intensity with respect to the 1st light source corresponding to the color rendering property category AAA is changed. This is an example of the spectrum of light emitted from the first light source corresponding to the color rendering index AA. It is a graph which shows the transition of the color rendering index evaluation number (Ra, R9) when the 2nd peak intensity with respect to the 1st light source corresponding to a color rendering index AA is changed. It is a graph which shows the transition of the value of R9 when the peak wavelength of the 2nd light source which is equivalent to the color rendering index AAA or is mixed with the 1st light source of the color rendering index class 4 is changed. It is a graph which shows the transition of the value of R9 when the peak wavelength of the 2nd light source which is equivalent to the color rendering index AA or is mixed with the 1st light source of a color rendering index class 3 is changed. It is a table which shows the upper limit value of the 2nd peak intensity which can obtain the color rendering property category AAA equivalent or the class 4 at each peak wavelength of the 2nd light source. It is a table which shows the lower limit value of the 2nd peak intensity which can obtain the color rendering property classification AA equivalent or the class 3 at each peak wavelength of the 2nd light source. It is a table which shows the upper limit value of the 2nd peak intensity which can obtain the color rendering index AA equivalent or the class 3 at each peak wavelength of the 2nd light source.

Hereinafter, one embodiment will be described with reference to the drawings. The description of the wavelength in the present embodiment is limited to the range of 380 nm to 780 nm, which is the wavelength region of visible light that can be perceived by the human eye. Further, the peak introduced in the present embodiment indicates a point showing the highest emission intensity in the spectral distribution of light emitted from a certain light source, and the peak wavelength indicates a wavelength that becomes a peak.

FIG. 1 shows the lighting device 1 of one embodiment. The lighting device 1 is, for example, a base light, and includes a housing portion 2 and a light source portion 3. The housing portion 2 is made of a metal such as aluminum and is fixed to a ceiling or a wall. The light source unit 3 is detachably attached to the housing portion 2 by an attachment mechanism (not shown in FIG. 1). The light source unit 3 includes a light emitting module 4 (not shown in FIG. 2) (not shown in FIG. 1). The light emitting module 4 is a light source of the lighting device 1, and the light emitted from the light emitting module 4 is finally taken out from the lighting device 1 and irradiated. Further, the lighting device 1 includes a power supply device (not shown in FIG. 1), and the power supply device is arranged in either the housing portion 2 or the light source portion 3.

The lighting device 1 shown in FIG. 1 is only an example of the lighting device 1, and the lighting device 1 is not limited to the base light. The lighting device 1 may be a spotlight, a light bulb, a downlight, or the like.

Next, the light emitting module 4 will be described. As described above, the light emitting module 4 is the light source of the lighting device 1, but the light source used in the lighting device is classified by JIS Z 9112 for color rendering properties. A light source that meets the strict color rendering properties irradiates light close to natural light, and such a light source is used as lighting for cosmetics, printing factories, and painting processes that require high color reproducibility.

As the color rendering index, a classification (type) such as color rendering A, color rendering AA, and color rendering AAA is provided as a high color rendering fluorescent lamp. The color rendering index A type is neutral white, and the minimum value of Ra is 75 and the minimum value of R15 is 65. Further, in the color rendering AA type daylight color, the minimum value of Ra is set to 88, the minimum value of R9 is set to 76, and the minimum value of R15 is set to 88. In the color rendering AA type neutral white, the minimum value of Ra is 86, the minimum value of R9 is 72, and the minimum value of R15 is 86. Further, in the color rendering AAA type daylight color, the minimum value of Ra is 95, the minimum value of R9 is 88, the minimum value of R10 is 88, the minimum value of R11 is 93, the minimum value of R12 is 88, and the minimum value of R13 is 93. , The minimum value of R14 is 93, and the minimum value of R15 is 93. In the color rendering AAA type neutral white, the minimum value of Ra is 95, the minimum value of R9 is 88, the minimum value of R10 is 88, the minimum value of R11 is 93, the minimum value of R12 is 90, and the minimum value of R13 is The minimum value of 93 and R14 is set to 93, and the minimum value of R15 is set to 93.

The above-mentioned classification is the classification of the color rendering property of fluorescent lamps, but there are also examples of lamps and lighting devices using LEDs as a light source, for example, using the definition of color rendering AAA.

As another classification of color rendering properties provided in JIS Z 9112, classifications (types) such as class 1, class 2, class 3, and class 4 are provided as high color rendering LEDs. Class 1 is the color rendering property recommended for office work in the office, and the minimum value of Ra is set to 80. Class 2 is a color rendering index recommended for work involving communication in offices and the like, and the minimum value of Ra is 90 and the minimum value of R15 is 85. Class 3 is the color rendering index recommended in museums, and the minimum value of Ra is 95 and the minimum value of R9 is 75. Class 4 is the color rendering property recommended for the workability of color comparison and color inspection, and the minimum value of Ra is 95 and the minimum value of R9 to R15 is 85. In the above-mentioned classes 1 to 4, the values of Ra and R9 to R15 obtained for daylight color and daylight white are the same.

As described above, when high color rendering property is required for the light source, it is important to increase the values such as Ra and R9 to R15. In JIS Z 9112, the range of the above-mentioned daylight color correlated color temperature is 5700K to 7100K, and the range of the daylight white correlated color temperature is 4600K to 5500K.

FIG. 2 shows the light emitting module 4 of one embodiment. The light emitting module 4 includes a substrate 41, a first light source 42, and a second light source 43. The substrate 41 may have a long shape that matches the length of the lighting device 1 in the longitudinal direction, or may have a rectangular or circular shape. The base material of the substrate 41 is made of a metal material such as ceramic or aluminum, or a resin material, and a wiring pattern or a mounting pad is formed on one surface side of the substrate 41. Then, the first light source 42 and the second light source 43 are mounted so as to be connected to the base material or the mounting pad on one surface side of the substrate 41.

The first light source 42 is a light source that irradiates white light. The white light here is assumed to be light generally used in homes, offices, stores, etc., and the light source color is daylight color or daylight white light. And preferably, the correlated color temperature of the white light is 4600K or more, and is a correlated color temperature of 4600K, 5000K, 5700K, 6500K, 7000K, 8000K, 9000K, 10000K and the like. The first light source 42 is composed of a combination of a light emitting element that irradiates blue or ultraviolet light and a phosphor, or is composed of a combination of light emitting elements that irradiate light such as blue, green, or red. The first light source 42 may be an SMD (Surface Mount Device) type or a COB (Chip on Board) type. Further, the color rendering index of the white light emitted from the first light source 42 may be any of A equivalent, AA equivalent, AAA equivalent, class 1, class 2, class 3, and class 4, and the color rendering index. It may be a light that does not apply to.

The second light source 43 irradiates light having a spectral distribution having a peak in a wavelength region longer than the longest wavelength at which the relative value peaks in the color matching function (see FIG. 3). Incidentally, in FIG. 3, the wavelengths at which the relative values of x (λ), y (λ), and z (λ) peak are about 600 nm for x (λ), about 555 nm for y (λ), and z (λ). ) Is about 445 nm. Further, the spectral distribution of the light emitted from the second light source 43 preferably has a peak in a wavelength region of 650 nm or more, which has a small contribution to the color matching function. Further, the spectral distribution of the light emitted from the second light source 43 preferably has a peak in a wavelength region of 700 nm or less in which the contribution to the color matching function is not zero. The second light source 43 is composed of a light emitting element that irradiates monochromatic light, and may be an SMD (Surface Mount Device) type or a COB (Chip on Board) type.

The light emitting element used in the first light source 42 and the second light source 43 may be an LED, or may be a light emitting element such as a laser diode or an organic EL. Further, the first light source 42 and the second light source 43 may be mounted one or more on the substrate 41, respectively.

An embodiment of the light emitting module 4 is shown in FIG. In FIG. 4, a plurality of first light sources 42 and a plurality of second light sources 43 are mounted on the substrate 41. Then, a row in which the first light source 42 is mounted is formed, and a row in which the second light source 43 is mounted is formed in the vertical direction of the row in which the first light source 42 is mounted. The second light source 43 is arranged so as to be located in the vertical direction between the two first light sources 42, and the first light source 42 and the second light source 43 are implemented so as to form a so-called staggered arrangement. ..

Further, as shown in FIG. 4, the second light source 43 may be mounted only in either the upward direction or the downward direction of the row in which the first light source 42 is mounted. At this time, it is preferable that the adjacent second light sources 43 are arranged at intervals of one or more of the second light sources 43.

The light emitted from the light emitting module 4 is irradiated with the light emitted from the first light source 42 and the light emitted from the second light source 43, and the light from the lighting device 1 (illuminating unit 3) is a mixture of the two lights. Is output. That is, the light output by the illuminating device 1 has a spectral distribution obtained by adding the spectral distribution of the light emitted by the first light source 42 and the spectral distribution of the light emitted by the second light source 43. At this time, by arranging the first light source 42 and the second light source 43 as described above, it is possible to efficiently mix the colors of the two light sources.

The light emitting module 4 is connected to the power supply device described above, and the power supply device controls the light emitted by the first light source 42 and the second light source 43 of the light emitting module 4. The power supply device inputs a PWM waveform or DC waveform current to the first light source 42 and the second light source 43 to control lighting (ON / OFF control) of each light source. The power supply device can not only control the lighting of each light source, but also control to gradually brighten or darken the light source (dimming control). The power supply device can also switch between a first lighting control that lights only the first light source 42 and a second lighting control that lights two light sources, the first light source 42 and the second light source 43.

Next, regarding the light emitted from the lighting device 1 of the present embodiment, that is, the light obtained by mixing the light emitted from the first light source 42 of the light emitting module 4 and the light emitted from the second light source 43. explain.

In the present embodiment, the illumination device 1 emits daylight color or neutral white light emitted from the first light source 42 and the longest wavelength at which the relative value peaks in the color matching function emitted from the second light source 43. Light with a spectral distribution having a peak in a longer wavelength region is irradiated with light in which the colors are mixed. The lighting device 1 of the present embodiment is used in, for example, a beauty facility or a studio, and illuminates human skin (including skin to which makeup is applied) in such a place, and the texture of the illuminated human skin. Has the effect of showing the image appropriately to the person who sees it (the effect of improving the visibility).

The visibility evaluation test and its result will be described below. FIG. 5 shows the spectrum of the conventional light used in the present visibility evaluation test, and FIG. 6 shows the spectrum of the present embodiment used in the present visibility evaluation test. The spectrum shown in FIG. 5 is a comparative example, and the spectrum shown in FIG. 6 is an example of the spectrum of light emitted from the lighting device 1 shown in the present specification. In this visibility evaluation test, the light of the conventional example and the light of the embodiment are designed so that the values related to color measurement and photometry such as color rendering are the same. For example, the correlated color temperature between the two is about 6500K, and the difference between the values of R1 to 15 is designed to be within 3 points. Therefore, both color rendering categories are equivalent to the color rendering index AAA, and are also in the color rendering index class 4.

Further, the light of the embodiment in the present visibility evaluation test has a spectrum shape similar to that of the conventional light at a wavelength of about 600 nm or less. That is, the light of the embodiment has a spectrum shape in which the light of the second light source 43 is added to the spectrum shape close to the conventional light. The spectral distribution of the light emitted from the second light source 43 has a peak in a wavelength region longer than the longest wavelength at which the relative value peaks in the color matching function, and the contribution to the color matching function is small. Therefore, even if the light of the second light source 43 is added to the light having a spectrum shape close to that of the conventional light, the correlated color temperature does not fluctuate significantly. Incidentally, in this visibility evaluation test, the light emitted from the second light source 43 is deep red light having a peak wavelength of about 690 nm (so-called DeepRed light).

The contents of the visibility evaluation test will be described. First, as a test method, the appearance of color when the evaluation sample is irradiated under the reference condition (light of the spectrum shown in FIG. 5) is compared with the appearance of color when irradiated under the test condition (light of the spectrum shown in FIG. 6). Was evaluated using the SD (Semantic Differential) method. There were four evaluation samples: a paper color sheet, a cloth color sheet, the back of the subject's hand (bare skin), and the back of the subject's arm coated with a makeup base. Various colors are shown on the paper color sheet and the cloth color sheet, and in this test, blue, green, red, yellow, and purple were used. Then, the visibility evaluation test was carried out by irradiating with 70 lx and 500 lx of light under the reference condition and the test condition, respectively. The number of subjects was eight, and the test was conducted three times per person.

7 to 10 show the results of the visibility evaluation test for each sample. The height of the bar graph in each figure indicates the average value of eight subjects, and the error bar indicates the standard deviation. And each figure shows what the subject looked like when it was irradiated under the test condition as opposed to the case where it was irradiated under the reference condition. In other words, if the bar graph extends to the plus side (positive side), it means that the test condition looked better, and if the bar graph extends to the minus side (negative side), it means that the reference condition It shows that it looked better.

FIG. 7 shows the results of a visibility evaluation test using a paper color sheet as an evaluation sample. In terms of vividness, blue, green, and red were better visible under the test conditions, and yellow and purple were better visible with the reference light source. In terms of brightness, the test conditions were better visible in all colors. In addition, the difference between the reference light source and the test conditions tends to be recognized more when irradiating with 500 lpx than when irradiating with 70 lpx as a whole, but regarding the brightness when irradiating with green, the person who irradiates with 70 lpx However, the difference between the reference light source and the test conditions was greatly recognized.

FIG. 8 shows the results of a visibility evaluation test using a cloth color chart as an evaluation sample. It can be confirmed that the bar graph extends to the plus side as a whole, and the test conditions are better visually recognized. In addition, the difference between the reference light source and the test conditions tends to be recognized more when irradiating with 500 lpx than when irradiating with 70 lpx as a whole, but the vividness when irradiating blue and the brightness when irradiating green As for the result, the difference between the reference light source and the test conditions was more recognized when the irradiation was performed at 70 lcx.

FIG. 9 shows the results of a visibility evaluation test using the back of the hand as an evaluation sample. It can be confirmed that the bar graph extends to the plus side as a whole, and the test conditions are better visually recognized.

FIG. 10 shows the results of a visibility evaluation test using the back of the arm of the subject coated with the makeup base as an evaluation sample. It can be confirmed that the bar graph extends to the plus side as a whole, and the test conditions are better visually recognized. In addition, the results were as good as or better than the results of the bare skin shown in FIG. 9, and the test conditions were better visible for both the bare skin and the skin with makeup. ..

The above is the result of the visibility evaluation test. Vividness, brightness, skin preference, and skin health are better when the evaluation sample is irradiated with a mixture of the conventional light and the light emitted from the second light source 43 than when the evaluation sample is irradiated with the conventional light. It was confirmed that such things were well visible. In this visibility evaluation test, the light emitted from the second light source 43 was deep red light having a peak wavelength of about 690 nm, but if the peak wavelength of the second light source 43 is in the range of 650 nm, the texture is textured. Can be expected to have the effect of showing properly.

Next, in the lighting device 1 to the light emitting module 4 of the present embodiment, the color rendering property classification of the light obtained by mixing the light emitted from the first light source 42 and the light emitted from the second light source 43 is the first. How it changes from the color rendering index of the light emitted from the light source 42 will be described. In determining the color rendering index, Ra and R9, whose numerical values fluctuate significantly, will be focused on.

In the above-mentioned visibility evaluation test, since the light source was used in an environment where the spectrum could be finely adjusted, it was possible to make adjustments so that the color rendering index was the same in the conventional example and the embodiment. There are many cases where fine adjustment is not possible depending on the usage pattern. In this case, the color rendering index of the light obtained by mixing the light emitted from the first light source 42 and the light emitted from the second light source 43 is the color rendering index of the light emitted from the first light source 42. , May be different. In many cases, the color rendering property classification of the light obtained by mixing the light emitted from the first light source 42 and the light emitted from the second light source 43 deteriorates (decreases). When the color rendering index of the mixed color light deteriorates (decreases), the effect of making the color originally possessed by the first light source 42 look favorable is diminished. There is a need for a method of mixing the light emitted from the light source 43. An example of the method is shown below.

When the color rendering index of the first light source 42 corresponds to AAA (Triple A), the spectrum of the light emitted from the first light source 42 is, for example, as shown in FIG. In the present embodiment, since the correlated color temperature of the first light source 42 is 4600 K or more, the peak wavelength (first peak), which is the wavelength at which the spectral intensity of the first light source 42 is maximized, is 500 nm or less. The first light source 42 in the present embodiment irradiates a neutral white light of 5000 K, and the peak wavelength of the spectrum is about 420 nm.

When the light emitted from the first light source 42 is mixed with the light of the second light source 43 that irradiates deep red light having a peak wavelength (second peak) of about 690 nm and a half price width of 22 nm, the first light source 42 It will be explained whether or not the color rendering property AAA equivalent, which is a color rendering property classification, is maintained. Since the color rendering index varies depending on the ratio of the emission intensities of the first light source 42 and the second light source 43 and affects the color rendering index, this time, a parameter called the second peak intensity will be used for explanation. .. The second peak intensity is the intensity at the peak wavelength (first peak) of the first light source 42 (in the present embodiment, the intensity at a wavelength of 420 nm) in the spectrum of light in which the first light source 42 and the second light source 43 are mixed. ) Is 1, which is the ratio of the intensity at the peak wavelength (second peak) of the second light source 43 (in the present embodiment, the intensity at the wavelength of 690 nm). Therefore, when the light having the peak wavelength of the second light source 43 is emitted from the first light source 42, the second peak intensity does not become zero.

FIG. 12 shows the transition of the color rendering index (Ra, R9) when the second peak intensity is changed. As described above, in order to satisfy the color rendering index AAA equivalent in neutral white, the minimum value of Ra needs to be 95 and the minimum value of R9 needs to be 88. Therefore, in the region where the second peak intensity is about 1.4 or more, R9 becomes 88 or less, so that the color rendering index equivalent to AAA is not satisfied. Therefore, in order to satisfy the color rendering index AAA equivalent, it is necessary to mix the light of the second light source 43 so that the second peak intensity is 1.4 or less.

Further, regarding the color rendering property classification, the same concept can be applied to class 4. As described above, in order to satisfy the color rendering index class 4 in neutral white, the minimum value of Ra needs to be 95 and the minimum value of R9 needs to be 85. Therefore, in the region where the second peak intensity is about 1.55 or more, R9 becomes 85 or less, so that the color rendering index class 4 is not satisfied. Therefore, in order to satisfy the color rendering index class 4, it is necessary to mix the light of the second light source 43 so that the second peak intensity is 1.55 or less.

Next, when the color rendering index of the first light source 42 corresponds to AA (double A), the spectrum of the light emitted from the first light source 42 is, for example, as shown in FIG. In the present embodiment, since the correlated color temperature of the first light source 42 is 5000 K or more, the peak wavelength at which the spectral intensity of the first light source 42 is maximized is 500 nm or less. The first light source 42 in the present embodiment irradiates a neutral white light of 5000 K, and the peak wavelength of the spectrum is about 450 nm. When the light emitted from the first light source 42 is mixed with the light of the second light source 43 that irradiates deep red light having a peak wavelength of about 690 nm and a half-value full width of 22 nm, it is a color rendering index of the first light source 42. Explain whether the color rendering index AA equivalent is maintained.

FIG. 14 shows the transition of the color rendering index (Ra, R9) when the second peak intensity is changed. As described above, in order to satisfy the color rendering index AA equivalent in neutral white, the minimum value of Ra needs to be 86 and the minimum value of R9 needs to be 72. Therefore, in the region where the second peak intensity is about 2.4 or more, R9 becomes 72 or less, so that the color rendering index equivalent to AA is not satisfied. Therefore, in order to satisfy the color rendering index AA equivalent, it is necessary to mix the light of the second light source 43 so that the second peak intensity is 2.4 or less.

Further, in FIG. 14, under the condition that the second light source 43 is mixed so that the second peak intensity is about 2.4 or less, the value of R9 is higher than the light of only the first light source 42. Therefore, even if the value of R9 of the first light source 42 is 71 or less and does not satisfy the color rendering index AA equivalent, the value of R9 can be made 72 or more by mixing the second light source 43, and the color rendering index AA can be set. It is also possible to satisfy a considerable amount. Further, in FIG. 14, in the range where the second peak intensity is about 0.7 or more and about 1.7 or less, the value exceeds 88, which is the minimum value of R9 corresponding to the color rendering index AAA.

Further, regarding the color rendering property classification, the same concept can be applied to class 3. As described above, in order to satisfy the color rendering index class 3 in neutral white, the minimum value of Ra needs to be 95 and the minimum value of R9 needs to be 75. Therefore, in the region where the second peak intensity is about 0.2 or less, R9 is 75 or less, or in the region where the second peak intensity is about 2.3 or more, Ra is 95 or less and R9 is 75 or less, resulting in color rendering. Gender classification class 3 is no longer satisfied. Therefore, in order to satisfy the color rendering index class 3, it is necessary to mix the light of the second light source 43 so that the second peak intensity is 0.2 or more and 2.3 or less.

In the above-mentioned example, the case where the first light source 42 is neutral white has been described, but the same idea can be applied even if it is daylight color.

Next, the case where the peak wavelength of the second light source 43 is changed will be described with reference to FIGS. 15 and 16. FIG. 15 shows R9 when the peak wavelength of the second light source 43 to be mixed with the first light source 42 corresponding to the color rendering index AAA or the color rendering index class 4 shown in FIG. 11 is changed to 690 nm, 670 nm, and 650 nm. It is a graph which shows the fluctuation of a value. FIG. 16 shows R9 when the peak wavelength of the second light source 43 to be mixed with the first light source 42 corresponding to the color rendering index AA or the color rendering index class 3 shown in FIG. 13 is changed to 690 nm, 670 nm, and 650 nm. It is a graph which shows the fluctuation of a value.

Generally, the luminous efficiency of a light source is expressed by "lumen / input power". The light emitted from the second light source 43 has a spectral distribution having a peak in a wavelength region longer than the longest wavelength at which the relative value peaks in the color matching function. Therefore, the longer the wavelength of the light emitted from the second light source 43, the smaller the contribution to the color matching function, and even if the light from the second light source 43 is mixed, the efficiency is lowered. (The lumen does not increase significantly and the input power increases.) That is, from the viewpoint of luminous efficiency, it is preferable that the peak wavelength of the second light source 43 is short. Therefore, there is a demand for shortening the peak wavelength of the second light source 43. There is. Further, since the second light source 43 becomes more expensive as the wavelength becomes longer, there is a demand for shortening the peak wavelength of the second light source 43 from the viewpoint of reducing the cost of the light emitting module.

From FIG. 15, when the second light source 43 having a peak wavelength of 690 nm is mixed with the first light source 42 corresponding to the color rendering index AAA (Triple A), the colors are mixed so that the second peak intensity is about 1.41 or less. Then, R9 corresponding to the color rendering index AAA can be obtained for the mixed color light, but when the second light source 43 having a peak wavelength of 670 nm is mixed, the second peak intensity is about 0.83 or less and the peak wavelength is 650 nm. It can be seen that when the light source 43 is mixed, the second peak intensity must be about 0.82 or less, otherwise R9 corresponding to the color rendering index AAA cannot be obtained.

Further, when the second light source 43 having a peak wavelength of 690 nm is mixed with the first light source 42 corresponding to the color rendering index class 4, the mixed color light can be obtained by mixing the colors so that the second peak intensity is about 1.55 or less. R9 of color rendering index class 4 can also be obtained, but when the second light source 43 having a peak wavelength of 670 nm is mixed, the second light source 43 having a second peak intensity of about 0.88 or less and a peak wavelength of 650 nm is mixed. In this case, it can be seen that if the second peak intensity is not about 0.85 or less, R9 of the color rendering index class 4 cannot be obtained.

Further, as shown in FIG. 16, when the second light source 43 having a peak wavelength of 690 nm is mixed with the first light source 42 corresponding to the color rendering index AA (double A), the second peak intensity is about 0.14 or more and 2.42. If the colors are mixed so as to be as follows, R9 corresponding to the color rendering index AA can be obtained for the mixed color light, but when the second light source 43 having a peak wavelength of 670 nm is mixed, the second peak intensity is about 0.21 or more, 1 When the second light source 43 having a peak wavelength of 0.0 or less and a peak wavelength of 650 nm is mixed, the second peak intensity must be about 0.34 or more and 0.71 or less, otherwise R9 corresponding to the color rendering index AAA cannot be obtained. I understand.

Further, when the second light source 43 having a peak wavelength of 690 nm is mixed with the first light source 42 corresponding to the color rendering index class 3, the color is mixed so that the second peak intensity is about 0.26 or more and 2.29 or less. Then, R9 of the color rendering index class 3 can be obtained for the mixed color light, but when the second light source 43 having a peak wavelength of 670 nm is mixed, the second peak intensity is about 0.21 or more, 0.95 or less, and the peak wavelength. When the second light source 43 having a wavelength of 650 nm is mixed, it can be seen that R9 of the color rendering index class 3 cannot be obtained unless the second peak intensity is about 0.33 or more and 0.69 or less.

The above-mentioned results are summarized in FIGS. 17 to 19. FIG. 17 is an upper limit value of the second peak intensity at which the color rendering index AAA equivalent or class 4 can be obtained at each peak wavelength of the second light source 43. FIG. 18 is a lower limit value of the second peak intensity at which the color rendering index AA equivalent or class 3 can be obtained at each peak wavelength of the second light source 43. FIG. 19 is an upper limit value of the second peak intensity at which the color rendering index AA equivalent or class 3 can be obtained at each peak wavelength of the second light source 43.

As described above, it can be confirmed that as the peak wavelength of the second light source 43 becomes shorter, the range of the second peak intensity for satisfying any color rendering index becomes narrower. Therefore, when the peak wavelength of the second light source 43 is shortened, the control range of the light source module 4 for satisfying an arbitrary color rendering index is also narrowed, and severe control is required. Therefore, the control system and the optical system are required. It can be complicated. Therefore, by lengthening the peak wavelength of the second light source 43, the control width of the light source module 4 for satisfying an arbitrary color rendering index can be widened, and the control system and the optical system can be simplified. Become.

Further, as the peak wavelength of the second light source 43 becomes shorter, the intensity of the second light source 43 that can be added while satisfying an arbitrary color rendering index decreases, so that the intensity of the second light source 43 decreases and the colors are mixed. There is a risk that the effect of making good visibility of the vividness, brightness, skin preference, skin health, etc. of the irradiation target will be diminished. In particular, when the peak wavelength of the second light source 43 to be mixed is smaller than 650 nm, the effect is remarkable. In this case, by lengthening the peak wavelength of the second light source 43, it is possible to increase the intensity of the second light source 43, and the vividness, brightness, skin preference, skin health, etc. of the irradiation target can be improved. It is possible to stably obtain the effect of making the eyes visible well.

Further, in the power supply device shown in the present embodiment, in a situation where illumination by light of a specific wavelength from the second light source 43 is unnecessary, the second light source 43 may be turned off and only the first light source 42 may be turned on. Lighting control with good luminous efficiency can be realized by lighting control, and in situations where illumination by the light of the deep red LED from the second light source 43 is required (for example, when looking at the skin to which makeup is applied), in addition to the first light source 42. By lighting the second light source 43, it is possible to realize lighting control that gives the same appearance as when the texture such as the skin color of a person is observed in daylight.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

1 Lighting device 2 Housing 3 Light source 4 Light emitting module 41 Board 42 1st light source 43 2nd light source

Claims (6)

A first light emitting element having a first peak wavelength of 500 nm or less and irradiating white light,
A second light emitting element having a second peak wavelength of 650 nm or more and 700 nm or less and irradiating monochromatic light,
A light emitting module having the same color rendering index of the light emitted from the first light emitting element and the color rendering index of the mixed color light of the first light emitting element and the second light emitting element. The color rendering index is equivalent to the color rendering index AAA.
The light emitting module according to claim 1, wherein the intensity at the second peak wavelength is 2.22 or less with respect to the intensity at the first peak wavelength. The color rendering index is class 4, and the color rendering index is class 4.
The light emitting module according to claim 1, wherein the intensity at the second peak wavelength is 2.52 or less with respect to the intensity at the first peak wavelength. The color rendering index is equivalent to the color rendering index AA.
The light emitting module according to claim 1, wherein the intensity at the second peak wavelength is 0.14 or more and 4.29 or less with respect to the intensity at the first peak wavelength. The color rendering index is class 3 in the color rendering index.
The light emitting module according to claim 1, wherein the intensity at the second peak wavelength is 0.23 or more and 4.04 or less with respect to the intensity at the first peak wavelength. A lighting device including the light emitting module according to any one of claims 1 to 5.

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