WO2023112392A1

WO2023112392A1 - Light-emitting device

Info

Publication number: WO2023112392A1
Application number: PCT/JP2022/031596
Authority: WO
Inventors: 弘桐原; 健森田
Original assignee: 株式会社エルム
Priority date: 2021-12-16
Filing date: 2022-08-22
Publication date: 2023-06-22

Abstract

Provided is a light-emitting device capable of creating a light environment in which biological rhythms can be adjusted and ensuring high color rendering properties at various color temperatures. A light-emitting device of the present invention is characterized by comprising: a first light-emitting body that emits light having a peak wavelength in a wavelength range of 480-510 nm and having a wavelength width characteristic that has a half-value wavelength width on both sides of 20 nm or less, a second light-emitting body that emits light having a peak wavelength in a wavelength range of 440-480 nm and having a wavelength width characteristic that has a half-value wavelength width on both sides of 20 nm or less, and a wide-light light-emitting body that emits light having a peak wavelength different from the peak wavelengths of light emitted by the first light-emitting body and the second light-emitting body in a wavelength range of 450-700 nm and having a wavelength width characteristic that has a half-value wavelength width on both sides of 30 nm or more; and a controller capable of independently controlling the emission intensity of the light emitted from the first light-emitting body, the second light-emitting body, and the wide-light light-emitting body.

Description

light emitting device

The present invention relates to a light-emitting device capable of adjusting biorhythm.

The innate biorhythms of humans are affected by the light environment such as the illuminance, color temperature, and spectral distribution of light experienced over time. The light environment is involved in the quality of sleep, such as the sleep-wake rhythm of the daily biorhythm, falling asleep at bedtime, awakening in the middle of sleep, and the feeling of deep sleep when waking up, and the quality of sleep affects human health. affect. Therefore, a suitable light environment is necessary for a healthy life of human beings.

For example, it is known that living in a 24-hour modern society under artificial lighting environment causes sleep disorders and depressive symptoms in humans. In order to solve this problem, it is necessary to improve the biorhythm, so it has been proposed to reduce the illuminance of the light environment, especially at night, as much as possible and to reduce the short-wavelength light region. However, in order to ensure workability and safety in daily life, a certain amount or more of brightness is required. Also, cutting short-wavelength light to an extreme extent results in a decrease in color rendering properties. Thus, the improvement of artificial lighting faces the dilemma of reducing adverse effects on biorhythms and ensuring the brightness and color rendering properties necessary for daily life.

In addition, for example, the biorhythms of inpatients and people requiring nursing care who spend most of their day on or around a bed in a hospital room in a medical facility or a living room in a nursing care facility are strongly affected by the artificial lighting environment. In particular, inpatients and people requiring nursing care who spend their time near corridors, where natural light is often insufficient even in sickrooms and living rooms, are more strongly affected by the artificial lighting environment.

The artificial lighting used in hospital rooms and living rooms includes the brightness (illuminance) and color temperature necessary for the work and behavior of the inpatients and nursing care recipients, as well as the brightness (illuminance) and color temperature necessary for the work and behavior of the inpatients and nursing care recipients. A high color rendering property is required to accurately grasp the skin color and facial expressions of people. However, living under such a light environment of artificial lighting disturbs the biorhythms of hospitalized patients and those requiring nursing care, and reduces the quality of their sleep. Disturbances in the biorhythms of hospitalized patients and those requiring nursing care, as well as poor sleep quality, increase the burden on nurses and caregivers at night. It has been pointed out that

For example, in Patent Document 1, a specific light source (blue light source) having a peak wavelength in the range of 450 nm to 480 nm, a light source for dimming consisting of a white light source and a light bulb color light source, and a control unit that controls the emission intensity of each light source. Disclosed is a lighting system capable of improving the biorhythm while performing daily life by changing the emission intensity of a specific light source according to the time period. It is known that blue light (light having a wavelength of around 460 nm) contained in the light emitted from the specific light source suppresses melatonin secretion. High melatonin secretion promotes sleep, while low melatonin secretion inhibits sleep. The luminescence intensity of the specific light source is set to be low during the period, and the luminescence intensity of the specific light source is set to be high during other time periods.

In addition, by using two types of light sources with different light colors and light distributions, and adjusting the output ratio of these two types of light sources to an appropriate value, we can create a lighting environment that adjusts the biorhythm without giving a sense of discomfort. A lighting system has been proposed (Patent Document 2).

Japanese Patent Application Laid-Open No. 2014-54290 Japanese Patent Application Laid-Open No. 2018-32538

The lighting system described in Patent Document 1 does not take color rendering into consideration, and depending on the object, it may look unnatural. In addition, although the lighting system described in Patent Document 2 takes into consideration the color rendering properties, the glare is high in the daytime and the illuminance is low in the hours before bedtime. It was inadequate to apply to a living room.

The problem to be solved by the present invention is to provide a light-emitting device capable of creating a light environment in which the biorhythm can be adjusted and ensuring high color rendering properties at various color temperatures.

A light-emitting device according to the present invention, which has been made to solve the above problems,
A first light emitter that emits light having a wavelength width characteristic that has a peak wavelength within a wavelength range of 480 nm to 510 nm and a half-value wavelength width on both sides of 20 nm or less, and a peak wavelength within a wavelength range of 440 nm to 480 nm. , a second light emitter that emits light having a wavelength width characteristic in which both side half-value wavelength widths are 20 nm or less; and a peak wavelength of light emitted by the first light emitter and the second light emitter within a wavelength range of 450 nm to 700 nm. a light-emitting unit including a wide light-emitting body that emits light having a wavelength width characteristic in which the peak wavelength is different from any of the above and the half-value wavelength width on the long wavelength side is 30 nm or more;
A control unit capable of independently controlling the emission intensity of the light emitted from the first light emitter, the second light emitter, and the wide light emitter is provided.

In the present invention, the "peak wavelength" means the wavelength of the top of the peak (peak top) seen on the spectrum of the light emitted by the light emitter. In addition, the "half-value wavelength width on both sides" means the wavelength width of the peak at the position where the emission intensity is 50% of the peak top, and the "half-value wavelength width on the long wavelength side" and the "half-value wavelength width on the short wavelength side". are the width on the longer wavelength side and the width on the shorter wavelength side than the peak wavelength in the wavelength width of the peak at the position where the emission intensity is 50% of the peak top.

The first luminous body, the second luminous body, and the wide light luminous body preferably use a light emitting diode (LED) as a light source in terms of ease of control of light emission intensity, but not limited to this. For example, an incandescent lamp, a fluorescent lamp, or the like may be used. Further, each luminous body may be composed of one light source, or may be composed of a plurality of light sources. When the luminous body is composed of a plurality of light sources, all the light sources may be of the same type, or a plurality of types of light sources may be mixed.

In general, light information received by the retina is transmitted to the brain through two different routes. One is transmitted to the visual cortex of the brain through cones and rods, resulting in the perception of brightness and color, which are functions of the visual system. The other is transmitted to the suprachiasmatic nucleus, which is the center of the biological clock, and causes non-visual system effects such as the light response of the biorhythm (regulation of the core body temperature and the phase and amplitude of the melatonin secretion rhythm, etc.). Retinal ganglion cells containing melanopsin (melanopsin expressing Retinal Ganglion Cell, hereinafter referred to as "mRGC") play an important role in non-visual system actions (Non-Patent Document 1). In the following description, the cones (L-cones, M-cones, S-cones), rods, and mRGC cells that play a role in transmitting light received by the retina to the brain are referred to as "photoreceptors."

The present inventors clarified the effects of multi-wavelength light sources such as red, green, and blue light with localized spectral distributions and high/low color temperature light with ubiquitous spectral distributions on melatonin secretion in the pineal gland. and pointed out the problem of the spectral distribution of artificial lighting used in living environments (Non-Patent Document 2). Then, by adjusting the wavelength composition of the illumination light and using metamerism (a phenomenon in which two objects appear to have the same color under certain light wavelength composition conditions), After ensuring brightness (illuminance), light color (color temperature), and color rendering properties, we established a method to selectively and independently stimulate photoreceptors on the retina.

In the light emitting device according to the present invention, the peak wavelength of the light emitted by the first light emitter is close to the sensitivity peak wavelength (505 nm) of the rods of the light receivers on the retina, and the peak wavelength of the light emitted by the second light emitter is , close to the sensitivity peak wavelength of S-cones (445 nm) and the sensitivity peak wavelength of mRGCs (490 nm). In addition, the broad light emitter emits light of a broad wavelength spectrum with a wide (or large) half-value wavelength width. The wavelength (540 nm) of the sensitivity peak wavelength of the L-cones (570 nm) may be included. Since the light-emitting portion is composed of a light-emitting body having such characteristic wavelength characteristics, the above method can be realized by using the light-emitting device according to the present invention.

That is, by increasing or decreasing the emission intensity of the light emitted by the first light emitter, which is one of the light emitters constituting the light emitting part, the amount of stimulus to the rods can be controlled, and the light emitted by the second light emitter can be controlled. By increasing or decreasing the luminescence intensity of mRGCs, the amount of stimulation to the S-cones can be controlled. In addition, by increasing or decreasing the emission intensity of the light emitted by the wide light emitter, the amount of stimulation to rods, mRGCs, M-cones, and L-cones can be controlled. In other words, by independently increasing or decreasing the emission intensity of the light emitted by all the light emitters that make up the light emitter, the illuminance, color temperature, and color rendering properties of the emitted light from the light emitter and the amount of stimulus to each light receiver can be adjusted. can be adjusted. Therefore, the amount of stimulation to cones and rods (brightness, color, illuminance of light) is maintained constant while the amount of stimulation to mRGCs is varied, or the amount of stimulation to mRGCs is maintained constant while the amount of stimulation to cones and rods is varied. It is also possible to vary the amount of stimulus to the rods.

It should be noted that the amount of stimulus that the light emitted from the light-emitting unit gives to the light receiver is obtained by multiplying the spectral radiant energy distribution of the emitted light and the spectral sensitivity distribution of the light receiver. The present inventors have so far applied metamerism to an LED lighting device equipped with a plurality of LEDs with different emission wavelengths, and have applied cones (L-cones, M-cones, S-cones ), the amount of light stimulation to mRGCs in humans affects melatonin secretion behavior and sleep sensation under the condition that the amount of stimulation to rods is constant and the output of each LED is adjusted to change the amount of stimulation to mRGCs. I have been researching the influence (Non-Patent Document 3). Based on the knowledge obtained in this research, if the emission intensity of the light emitted by the first and second light emitters and the wide light emitter in a day is appropriately increased or decreased, workability and behavior in daily life will be impaired. It is possible to obtain a light environment in which the biorhythm can be adjusted.

In the light-emitting device according to the present invention, the wide light-emitting body is
A third light emitter that emits light having a wavelength width characteristic of having a peak wavelength within a wavelength range of 450 nm to 470 nm, a half-value wavelength width of 20 nm or less on the short wavelength side, and a half-value wavelength width of 50 nm or more on the long wavelength side. and,
a fourth light emitter that emits light having a wavelength width characteristic in which the peak wavelength is within a wavelength range of 540 nm to 550 nm and the half-value wavelength width on the short wavelength side and the long wavelength side is 30 nm or more;
A fifth emission emitting light having a wavelength width characteristic of having a peak wavelength within a wavelength range of 620 nm to 650 nm, a half-value wavelength width of 30 nm or more on the short wavelength side, and a half-value wavelength width of 40 nm or more on the long wavelength side. including the body and
It is preferable that the control unit can independently control the light emission intensity of the light emitted by the third to fifth light emitters.

In the light-emitting device having the above configuration, the peak wavelength of light emitted by the third light emitter is close to the sensitivity peak wavelength of mRGC, the peak wavelength of light emitted by the fourth light emitter is close to the sensitivity peak wavelength of the M-cone, and The peak wavelength of the light emitted by the five emitters is close to the sensitivity peak wavelength of the L-cones. By using five types of light emitters corresponding to the sensitivity peak wavelengths of the five types of photoreceptors on the retina in this manner, the amount of stimulation that the emitted light from the light emitting unit exerts on each of the five types of photoreceptors can be finely adjusted. can be adjusted. Therefore, by appropriately controlling the emission intensity of the light emitted by each light emitter, the emitted light from the light emitting unit can be adjusted to the amount of stimulus to mRGC, color temperature, brightness (illuminance), color rendering index (general color rendering index, Special color rendering index) can be adjusted to the optimum state.

In the light emitting device having the above configuration, it is preferable that the control section controls the emission intensity of the light emitted from each of the light emitters so that the color temperature of the light emitted from the light emitting section is in the range of 2500K to 15000K. As a result, the output light equivalent to the light emitted by various commercially available artificial light sources (incandescent light bulbs, fluorescent lights (bulb color to daylight color)), and the natural light (sunlight) experienced indoors and outdoors in various time periods and weather conditions can be obtained.

The light emitting device according to the present invention further includes a setting unit for setting the color temperature and the amount of mRGC stimulation;
the color temperature and mRCG stimulus amount of the light emitted from the light emitting unit, and the emission intensity of the light emitted by each of the first light emitter, the second light emitter, and the wide light emitters (third to fifth light emitters); and a storage unit that stores information indicating the relationship of
Based on the information, the control unit controls the emission intensity of each light emitter so that the color temperature and the amount of mRCG stimulation of the light emitted from the light emitting unit become the color temperature and the amount of mRCG stimulation set by the setting unit. is preferably configured to control the

The information stored in the storage section can be obtained, for example, by the following procedure.
That is, the luminescence distribution characteristics of each luminous body are measured in advance, and the luminous intensity of the light emitted by each luminous body when the color temperature of the emitted light from the light emitting part reaches a specified value (luminous intensity of the luminous body) is obtained by calculation, and the combination of the emission intensities of all the light emitters constituting the light emitting section is made to correspond to the color temperature of the light emitted from the light emitting section. Usually, there are multiple combinations of luminous intensities when the color temperature of emitted light is a specified value, so one color temperature corresponds to a plurality of combinations of luminous intensities. become.

Next, the amount of stimulus to mRGC, the general color rendering index, and the special color rendering index are calculated for a plurality of combinations of luminous intensities corresponding to the color temperatures. For example, if the emission intensity of five types of light emitters can be changed in 100 steps, for ¹⁰⁰⁵ (10 billion) combinations, the amount of stimulation to mRGC (mRGC stimulation amount), the average color rendering index, and Calculate the special color rendering index.
Then, from among the 100 ⁵ combinations, a combination with the same mRGC stimulation amount is extracted, and a combination of luminous intensities with a high general color rendering index and a high special color rendering index from among those combinations ( (referred to as the “optimum combination”).
When the optimum combination is selected for a plurality of combinations of luminescence intensities of light emitters corresponding to all color temperatures, the optimum combination is stored in the storage unit as information of a data table linked with color temperature and mRGC stimulation amount. do.

By storing the data table obtained by the above procedure in the storage unit, the control unit can determine the combination of the light emission intensity corresponding to the color temperature and the mRGC stimulation amount set in the setting unit. It is possible to read from the data table and adjust the emission intensity of each light emitter. By using such a data table, the emission intensity of each light emitter can be controlled without delay after the color temperature and the amount of mRGC stimulation are set. In addition, it becomes possible to easily change the amount of mRGC stimulation while maintaining a constant color temperature, or to change the color temperature while maintaining a constant amount of mRGC stimulation.

In addition, by storing the above-mentioned optimum combinations of luminous intensities as a data table, it is possible to quickly correspond the luminous intensity of each light emitter even if the color temperature and the amount of mRGC stimulation are increased or decreased, and the average color rendering property evaluation can be performed. and the special color rendering index can always be maintained in an optimum state, it is possible to reduce the influence on workability and behavior in daily life.

Note that the setting unit may have values of the color temperature and the amount of mRGC stimulation set in advance. The values of the color temperature and the amount of mRGC stimulation input through , may be set in the setting unit.
In addition, a control program (time schedule) is stored in the storage unit to increase or decrease the color temperature and the amount of mRGC stimulation depending on the time of day using the clock function necessary to adjust the biological rhythm of the day, According to the control program, the setting unit may set the color temperature and the amount of mRGC stimulation, and the control unit may control the light emission intensity of each light emitter.

By using the light-emitting device according to the present invention, it is possible to create a light environment in which the biorhythm can be adjusted, and to ensure high color rendering properties at various color temperatures.

1 is a schematic configuration diagram of a first embodiment of a light emitting device of the present invention; FIG. FIG. 4 is a light characteristic diagram of first to fifth light emitters (LEDs); An example of a distribution map of color temperature and mRGC stimulation that satisfies the conditions of general color rendering index (Ra) ≥ 90, special color rendering index R9 (red), and R15 (skin color) ≥ 90. Explanatory drawing of the method to increase/decrease the color temperature and the amount of mRGC stimulation. An example of a distribution map of color temperature and mRGC stimulation that satisfies the following conditions: general color rendering index (Ra) ≥ 70, special color rendering index R9 (red), R15 (skin color) ≥ 70. An example of a distribution map of color temperature and mRGC stimulation that satisfies the conditions of general color rendering index (Ra) ≥ 80, special color rendering index R9 (red), and R15 (skin color) ≥ 80. Table showing the schedule of Experiment 1. Graph showing the average melatonin concentration at each time from 18:00 to 24:00. Graph showing the amount of change in the average melatonin concentration from 18:00 to 19:00 to the average melatonin concentration from 23:00 to 24:00. Table showing the schedule for Experiment 2. Graph showing changes in total melatonin secretion increase from 21:00 to 24:00. The figure which shows the modification of the light-emitting device which concerns on this invention. 1 is a schematic configuration diagram of a mirror around which a light emitting device according to the present invention is installed; FIG.

An embodiment in which the present invention is applied to a light-emitting device installed on the ceiling of a hospital room in a medical facility or a living room in a nursing facility will be described below with reference to the drawings.
FIG. 1 is a schematic configuration diagram of a light emitting device. The light emitting device 1 includes a light emitting section 10 and a light emission control section 20 .

The light emitting unit 10 includes a rectangular container-shaped housing 11, a substrate 12 arranged on the inner bottom, LEDs 101 to 105 which are five types of light emitters arranged on the substrate 12, and these LEDs 101 to 105. and a drive circuit 13 of. One surface of the housing 11 is open, and the opening is closed with a diffusion plate (not shown) that transmits and diffuses the light from the light emitters 101 to 105 . Although FIG. 1 shows an example in which a round LED is mounted on the substrate 12, the shape of the LED is not limited to a round shape, and may be rectangular or bulb-shaped.

The light emission control unit 20 controls the operation of the light emitters 101 to 105 of the light emission unit 10, and includes a light emission control circuit 201, a storage unit 202, a setting unit 203, a wireless communication unit 204, and a clock circuit 205 as functional blocks. I have. It also has an input section 21 and a display section 22 .
The storage unit 202 stores a plurality of data sets each including a combination of values of illuminance, color temperature, and mRCG stimulation amount of the light emitted from the light emitting unit 10, and data of the light emitted by the light emitters 101 to 105 corresponding to each data set. A data table is stored showing the relationship with the emission intensity. In addition, the storage unit 202 stores a timetable showing the emission intensity of the light emitted by the light emitters 101 to 105 on each day of the year. These data table and time table will be described later.

The substance of the above light emission control unit 20 is a general computer, and the functions of the above functional blocks are realized by operating dedicated control software installed in the computer on the computer. Therefore, the input unit 21 includes pointing devices such as a keyboard and a mouse. The light-emitting device 1 can input values of illuminance, color temperature, and mRGC through the input unit 21 , and these input values are set in the setting unit 203 .

The light emission control unit 20 also includes an external connection terminal 206 that is a wired communication network connection terminal such as a USB port, an Ethernet port, an RS-232C port, and the like. The light emission control unit 20 can transmit and receive data to and from external devices such as a personal computer through the external connection terminal 206 .

Also, the wireless communication unit 204 can communicate with a mobile terminal 30 such as a smartphone, and the user sets the color temperature and mRGC of the emitted light of the light emitting unit 10 in the setting unit 203 by operating the mobile terminal 30. can do.

The five types of LEDs 101 to 105 have different peak wavelengths, and are arranged on the substrate 12 in the order of

LEDs

101, 102, 103, 104, and 105 in multiple rows. In FIG. 1, the five types of LEDs 101 to 105 are represented by different patterns.

FIG. 2 is a light characteristic diagram of the LEDs 101-105. The LED 101 corresponds to the first light emitter of the present invention, and is a single-wavelength cyan LED having a peak wavelength of 505 nm and a half-value wavelength width of about ±10 nm (both-side half-value wavelength widths of 20 nm). The LED 102 corresponds to the second light emitter of the present invention, and is a single-wavelength blue LED having a peak wavelength of 445 nm and a half-value wavelength width of about ±10 nm (both sides half-value wavelength width of 20 nm). The LED 103 corresponds to the third light emitter of the present invention, and has a wavelength width characteristic of a peak wavelength of 455 nm to 460 nm and a half-value wavelength width of about +50 nm (the half-value wavelength width on the long wavelength side is 50 nm). The LED 104 corresponds to the fourth luminous body of the present invention, and has wavelength width characteristics such as a peak wavelength of 540 nm and a half-value wavelength width of about +30 nm (the half-value wavelength width on the long wavelength side is 30 nm). The LED 105 corresponds to the fifth luminous body of the present invention, and has wavelength width characteristics such that the peak wavelength is 640 nm and the half-value wavelength width is ±60 nm (the half-value wavelength width on the short wavelength side is 60 nm, and the half-value wavelength width on the long wavelength side is 60 nm). is an LED having Moreover, the LEDs 103 to 105 also correspond to the wide light emitters of the present invention. In this embodiment, each of the LEDs 103 to 105 is made to have the peak wavelength and wavelength width characteristics described above by applying a phosphor to the blue LED. In FIG. 2, the light spectra of the LEDs 101 to 105 are normalized so that the peak levels are the same. An appropriate value may be set according to the color temperature and the amount of mRCG stimulation.

Next, the data table and timetable will be explained.
As described above, the data table corresponds to a plurality of data sets consisting of combinations of values of the illuminance, color temperature, and mRCG stimulation amount of the light emitted from the light emitting unit 10, and the light emission intensity of the light emitted by the LEDs 101 to 105. It is what I let you do.

The light emission control circuit 201 includes a circuit that changes the light emission intensity of the first to fifth LEDs 101 to 105 by PWM control. For example, in the case of PWM control with 8-bit resolution, it is possible to control the emission intensity with a numerical value from 0 to 255. That is, when the numerical value is 0, the light is turned off, and when the numerical value is 255, the maximum emission intensity is obtained.

Therefore, first, the spectral irradiance of the maximum emission intensity of each of the first to fifth LEDs 101 to 105 is measured with a spectral irradiance meter (Konica Minolta: CL -500A), and each light receiver (L, M, S-cone, mRGC , rods) are multiplied by the measured spectral irradiance and integrated over the wavelength range of 400 nm to 750 nm, and the amount of stimulus to mRGCs (Melanopic ELR). Then, using the calculation results, color temperature, mRGC stimulation amount, illuminance, general color rendering index (Ra), special color rendering index R9 (red ) and R15 (skin color), and among them, a color temperature that satisfies the conditions of general color rendering index (Ra) ≥ 90, special color rendering index R9 (red), and R15 (skin color) ≥ 90 and mRGC stimulation amounts (data set), and the corresponding sets of emission intensities of the first to fifth LEDs 101 to 105 at that time are stored in the storage unit 202.

FIG. 3 is a distribution diagram of each set of color temperature and mRGC stimulation amount included in the data table obtained as described above. In the distribution diagram of FIG. 3, the vertical axis indicates the color temperature (K), and the horizontal axis indicates the mRGC stimulation level (Melanopic ELR, mW/lm).

From the distribution diagram in FIG. 3, one combination of the PWM output values (0 to 255) of the first to fifth LEDs 101 to 105 for realizing emitted light with a color temperature of, for example, 12000K is as shown in Table 1 below. I understand.

Also, one combination of the PWM output values of the first to fifth LEDs 101 to 105 for realizing emitted light with a color temperature of 3000K, for example, is shown in Table 2 below.

Furthermore, as can be seen from the distribution chart in Fig. 3, the color temperature and the mRGC stimulation amount that satisfy the conditions of general color rendering index (Ra) ≥ 90, special color rendering index R9 (red), and R15 (skin color) ≥ 90. The sets include a plurality of sets with the same color temperature and different mRGC stimulation amounts, and a plurality of sets with the same mRGC stimulation amounts and different color temperatures. From this, the amount of mRGC stimulation for a color temperature of 3000K is 0.6-0.8mW/lm, the amount of mRGC stimulation for a color temperature of 5000K is 1.0-1.2mW/lm, and the amount of mRGC stimulation for a color temperature of 12000K is 0.6-0.8mW/lm. It can be seen that the mRGC stimulation amount can be varied between 1.5 and 1.8 mW/lm.
Similarly, it can be seen that the color temperature can be changed between 4000 and 5000 K when the mRGC stimulation level is 1 mW/lm and between 7000 and 11000 K when the mRGC stimulation level is 1.5 mW/lm. .

In other words, as shown in Fig. 4, which is a distribution map with circled numbers and arrows, it is possible to shift from a high color temperature and high mRGC stimulation amount to a medium color temperature and medium mRGC stimulation amount (1 → 2), or to keep the color temperature constant. The amount of mRGC stimulation is gradually decreased while maintaining the constant (2 → 3), the color temperature is decreased while maintaining the mRGC stimulation constant (3-6), and the color temperature is changed from medium color temperature/medium mRGC stimulation amount to low color temperature/ A light-emitting device 1 capable of transitioning to a low mRGC stimulation amount (6-14) can be realized.

Also, for example, in one day, the color temperature is maintained while maintaining the general color rendering index (Ra) ≥ 90, the special color rendering index R9 (red), R15 (skin color) ≥ 90, and maintaining the illuminance constant. is gradually changed from 12000K to 3000K, the amount of mRGC stimulation at each color temperature can be controlled within a range of change of 0.2 to 0.3 mW/lm.

The time table is obtained by setting appropriate pairs of color temperature and mRGC stimulus amount for each time slot from the above data table. Table 3 shows an example of a timetable.

Note that the storage unit 202 stores color temperature and color temperature conditions other than the conditions of general color rendering index (Ra)≧90, special color rendering index R9 (red), and R15 (skin color)≧90 under certain illuminance conditions. A data table that associates sets of mRGC stimulation amounts with sets of emission intensities of the first to fifth LEDs 101 to 105 may be stored.

For example, FIG. 5 shows a distribution map of color temperature and mRGC stimulation amount satisfying the conditions of general color rendering index (Ra)≧70, special color rendering index R9 (red), R15 (skin color)≧70, and FIG. shows a distribution map of color temperature and mRGC stimulation amount satisfying the conditions of illuminance 500lx, general color rendering index (Ra) ≥ 80, special color rendering index R9 (red), R15 (skin color) ≥ 80. .

Next, an experiment performed using the light emitting device 1 will be described.
[Experiment 1]
The light emission conditions of the light emitting device were changed in an artificial climate room in which the outside light was blocked, saliva was collected from 22 subjects (males in their twenties) over three days, and melatonin concentration was measured from the collected saliva. Luminescent conditions were measured using a spectral irradiometer CL-500A manufactured by Konica Minolta, and melatonin was analyzed using ELISA manufactured by BULMANN.

Fig. 7 shows the experiment schedule. Subjects enter the experimental room at 10:00 on the first day of the experiment and stay there for four days. After that, sleep in complete darkness from 24:00 to 7:00 in the morning, and from the second day onwards, under either the condition A shown in Table 4-1 or the condition B shown in Table 4-2 below. spent in

During the experiment, except for emergencies, the subjects lived in the laboratory, including meals, excretion, and showering, and were provided regular meals at 8:00, 12:00, and 18:00. Drinking water was allowed ad libitum, but no snacks were allowed.

Saliva was collected every hour from 18:00 until 24:00.

Except for the data collection time, we decided to spend the time freely during the experiment. However, excessive exercise and naps were prohibited because they affected the results. During free time, you can read a book or write a report, and when using a computer display or smartphone, set the brightness of the screen to dark and from 10:00 in the morning to 16:30 in the evening. allowed to use within

　Out of 22 subjects, 3 subjects who had problems with the progress of the experiment were excluded, and data from 19 subjects were used to determine the overall average melatonin concentration on the third day of the experiment under conditions A and B. The results are shown in Table 5 and FIG.

In condition A, the light environment was such that a constant illuminance was maintained from 7:00 to 24:00 in the morning, and the mRGC stimulation level was maintained at 1.2 mW/lm. In condition B, a constant illuminance was maintained from 7:00 to 24:00, and the mRGC stimulation level was increased to 1.8 mW/lm at a color temperature of 20,000 K to 12,000 K only for 30 minutes from 7:00. Overnight, the mRGC stimulation dose was tapered down to 0.6 mW/lm.

From Table 5 and Fig. 8, there was no significant difference in the average melatonin concentration between Condition A and Condition B from 18:00 to 23:00. On the other hand, at 24:00, there was a trend toward an increase in the concentration of melatonin under the lighting conditions of condition B compared to that under the lighting conditions of condition A, although this was not statistically significant.

Therefore, from the values shown in Table 5, the average melatonin concentration in the first half of the night from 18:00 to 19:00 and from 23:00 to 24:00 just before going to bed was obtained. Table 6 shows the results. FIG. 9 shows the difference between the average melatonin concentration from 18:00 to 19:00 and the average melatonin concentration from 23:00 to 24:00. This difference corresponds to the amount of change in melatonin secretion during the night.

Regarding the change in melatonin secretion from the first half of the night to just before going to bed under the lighting conditions of condition A and condition B, a test (paired t-test) of the difference in the population mean of the two related groups was performed. A statistically significant difference was detected at a risk rate of 5% or less (p=0.015), and a greater increase in secretion was observed from evening to midnight (just before bedtime) under condition B than under condition A.

From this, it is speculated that condition B showed a phase advance in the melatonin secretion behavior from the evening to the night before bedtime, or (and) an increase in the total amount of melatonin secreted at night, than under condition A. The phase advance of melatonin secretion behavior and the increase in the total amount of melatonin secreted at night lead to the smooth onset of sleep and the securing of deep sleep. It is considered to be

[Experiment 2]
In Experiment 2, in addition to the lighting conditions of Experiment 1, the experiment was conducted under the lighting conditions in which strong mRGC stimulation was added in the evening to reduce the influence of blue light emitted from the screens of mobile devices such as smartphones on falling asleep at night. did

We changed the lighting conditions of the light-emitting device in a room where outside light was blocked, collected saliva from one subject (male in his 50s) over 5 days, and measured the melatonin concentration from the collected saliva. Luminescent conditions were measured using a spectral irradiometer CL-500A manufactured by Konica Minolta, and melatonin was analyzed using ELISA manufactured by BULMANN.

Fig. 10 shows the experiment schedule. The subjects entered the experimental room at 10:00 on the first day of the experiment and stayed there for 5 days. The first and second days were spent under the condition A, the third day under the condition B, and the fourth day under the condition C. During the experiment, the subjects lived in the laboratory except for emergencies, including meals, excretion, and showering. Saliva was collected hourly from 18:00 until 24:00.

They were allowed to spend their time freely during the experiment, but excessive exercise and naps were prohibited as they would affect the results. From 8:00 a.m. to 4:00 p.m., computers and other displays and smartphones can be used as usual.

I watched videos every day from 20:00 to 24:00 with a smartphone placed at a distance of 30-40 cm from my eyes.

Table 7 shows the details of the set emission conditions.

Table 8 shows the results of melatonin concentration in Experiment 2. FIG. 11 is a graph showing changes in the total increase in melatonin secretion from 21:00 to 24:00.

The light from the mobile terminal monitor experienced from 20:00 to 24:00 just before going to bed suppresses melatonin secretion, and the problem that affects subsequent sleep is whether or not there is an effect using prior artificial light history. Considering the focus of this confirmation, from Table 5, the average melatonin concentration from 18:00 to 20:00 was used as the standard, and the total increase in melatonin secretion for the subsequent 4 hours from 21:00 to 24:00 was recalculated. Table 9 shows.

From Table 9, the total increase in melatonin secretion from 21:00 to 24:00 relative to the average value of melatonin secretion from 18:00 to 20:00 (sum of 21:00, 22:00, 23:00, and 24:00) was 2.5 pg/4 hours under condition A. , 2.8 pg/4 hours under condition B and 3.2 pg/4 hours under condition C.

That is, the total amount of melatonin secreted until going to bed at night increased by about 12% under the condition B of the biorhythm-adjusting light environment compared to the condition A of the general living light environment. An increase of approximately 28% was observed in condition C, in which a strong mRGC stimulation experience was added in the evening.

In this experiment, we limited the understanding of melatonin secretion behavior to before going to bed, and did not understand melatonin secretion behavior during sleep. Therefore, the increase in the total amount of melatonin secreted until going to bed at night may have been the result of the fact that the light environment under condition B or condition C accelerated the start time of melatonin secretion (phase advance), or the amount of melatonin itself increased. It is unclear whether it was the result of (magnification of amplitude) or both.

However, whether it is phase advance, amplitude expansion, or both, from the viewpoint of human health (induction and maintenance of comfortable sleep), the light environment that provides strong stimulation to mRGCs in the evening is considered to bring about very desirable results, and in particular, the light environment of condition C is considered to bring about beneficial effects on human health.

It should be noted that the present invention is not limited to the above-described embodiments, and appropriate modifications and additions are possible.

For example, FIG. 12 shows a modification of the light emitting device. The light emitting device includes a rectangular plate-shaped light guide plate 401 and a pair of rod-shaped light emitting portions 10 arranged on the left and right sides of the light guide plate 401 . Note that illustration of the light emission control unit is omitted in FIG. In this configuration, the light emitted from the light emitter (not shown) included in the light emitting section 10 is diffused within the light guide plate 401 and can be emitted from the surface of the light guide plate 401 as uniform light.

Further, as shown in FIG. 13, the light-emitting units 10 of the light-emitting device may be arranged at three locations, ie, the upper portion and the left and right portions of the rectangular mirror 402 . Also in FIG. 13, illustration of the light emission control unit is omitted.
For example, the light emitted from the light emitting unit 10 has a color temperature of 12000 K, an illuminance of 500 lx or more, a general color rendering index (Ra)≧90, a special color rendering index of R9 (red), R15 (skin color)≧90, and mRGC. A light environment with a stimulus level of 1.8 mW/lm (Melanopic ELR) or more can be realized in front of a mirror. In other words, makeup can be applied in a light environment with high color rendering, so that the ease of applying makeup and the beauty of the finish are improved.

In addition, it is generally said that the average time spent applying makeup in front of a mirror is about 15 to 30 minutes. By using the above-mentioned mirror 402, it is possible to spend, for example, 30 minutes in the morning in a light environment where the amount of stimulus to mRGC is high when applying makeup, thereby promoting the secretion of serotonin during the day, and the biorhythm. can be adjusted.

The light-emitting device according to the present invention is suitable as a light-emitting device for use in hospital rooms and living rooms in medical facilities and nursing care facilities, but it can also be used as a light-emitting device for lighting indoors in offices, schools, ordinary homes, and the like. may Further, in the above embodiment, the case of adjusting the human biorhythm using the light emitting device has been described. , the biorhythm and behavior of insects, and the germination, growth, and photosynthesis of plants.

Further, in the above embodiment, the wide light emitter is composed of three types of light emitters (LED103 to LED105), but the number of light emitters constituting the wide light emitter may be one, two, or four or more. It's okay. Also, each of the first light emitter and the second light emitter may be composed of two or more types of light emitters.

Furthermore, the above-described embodiment is merely an example of the present invention, and it is clear that any modifications, additions, deletions, etc., made as appropriate within the scope of the claims of the present application are included in the present invention.

[Aspect]
Those skilled in the art will appreciate that the exemplary embodiments described above are specific examples of the following aspects.

(Section 1) The light-emitting device according to Section 1 is
a first light emitter that emits light having a wavelength width characteristic that has a peak wavelength in a wavelength range of 480 nm to 510 nm and a half-value wavelength width on both sides of 20 nm or less; A second light emitter that emits light having a wavelength width characteristic with a half-value wavelength width of 20 nm or less, and a peak wavelength of light emitted by the first light emitter and the second light emitter in a wavelength range of 450 nm to 700 nm. a light-emitting unit including a wide light-emitting body that emits light having different peak wavelengths and having a wavelength width characteristic in which the half-value wavelength width on the long wavelength side is 30 nm or more;
and a controller capable of independently controlling the emission intensity of the light emitted by the first light emitter, the second light emitter, and the wide light emitter.

(Section 2) The light-emitting device according to Section 2 is the light-emitting device according to Section 1,
The wide light emitter is
a third light emitter that emits light having a wavelength width characteristic of having a peak wavelength in a wavelength range of 450 nm to 470 nm, a half-value wavelength width of 20 nm or less on the short wavelength side, and a half-value wavelength width of 50 nm or more on the long wavelength side; ,
a fourth light emitter that emits light having a wavelength width characteristic that has a peak wavelength in a wavelength range of 540 nm to 550 nm and has a half-value wavelength width of 30 nm or more on the short wavelength side and the long wavelength side;
A fifth light emitter that emits light having a wavelength width characteristic of having a peak wavelength in a wavelength range of 620 nm to 650 nm, a half-value wavelength width of 30 nm or more on the short wavelength side, and a half-value wavelength width of 40 nm or more on the long wavelength side. including and
The controller can independently control the light emission intensity of the light emitted by the third to fifth light emitters.

(Section 3) The light-emitting device according to the third term is the light-emitting device according to the first or second term, wherein the control unit controls the color temperature of the light emitted from the light-emitting unit to be in the range of 2500K to 15000K. Second, the emission intensity of the light emitted by the light emitter is controlled.

(Section 4) The light-emitting device according to Section 4 is the light-emitting device according to any one of Sections 1 to 3,
moreover,
a setting unit for setting the color temperature and the amount of mRGC stimulation;
Information indicating the relationship between the color temperature and mRCG stimulus amount of the light emitted from the light emitting unit and the emission intensity of the light emitted by each of the first light emitter, the second light emitter, and the wide light emitter is stored. a storage unit containing
Based on the information, the control unit controls the emission intensity of each light emitter so that the color temperature and the amount of mRCG stimulation of the light emitted from the light emitting unit become the color temperature and the amount of mRCG stimulation set by the setting unit. to control.

(Section 5) The light-emitting device according to Section 5 is the light-emitting device according to Section 4, wherein the information stored in the storage unit includes a plurality of sets having the same color temperature and different mRGC stimulation amounts. It contains information in which the emission intensities of the light emitters are associated with each other.

(Section 6) The light-emitting device according to Section 6 is the light-emitting device according to

Section

4 or 5, wherein the information stored in the storage unit includes a plurality of light-emitting devices having the same mRGC stimulation amount and different color temperatures. The set includes information in which the emission intensities of the light emitters are associated with each other.

(Section 7) The operation method of the light emitting device according to Section 7 is
7. A method for operating a light-emitting device according to any one of items 4 to 6, wherein light having a predetermined color temperature and mRGC stimulation amount is emitted in order to adjust the biological rhythm of the subject,
Based on the information stored in the storage unit, the control unit determines that the color temperature and the amount of mRGC stimulation of the light emitted from the light emitting unit during a period of 60 minutes to 120 minutes from the subject's wake-up time adjusting the light emission intensity of the light emitted by the first light emitter, the second light emitter, and the wide light emitter, respectively, so that the color temperature and the amount of mRGC stimulation of the light emitted from the light emitting unit in the time zone of In the time zone from the time 10 hours to 12 hours after the wake-up time to the subject's bedtime, the color temperature and the mRGC stimulation amount of the light emitted from the light emitting unit are the same as the light emission in the other time zone. The emission intensities of the light emitted from the first light emitter, the second light emitter, and the wide light emitter are each adjusted so that the color temperature and the mRGC stimulus amount of the emitted light from the part are lower than those.

(Section 8) The method for operating the light-emitting device according to Section 8 is
7. A method for operating a light-emitting device according to any one of items 4 to 6, wherein light having a predetermined color temperature and mRGC stimulation amount is emitted in order to adjust the biological rhythm of the subject,
Based on the information stored in the storage unit, the control unit determines that the color temperature and the amount of mRGC stimulation of the light emitted from the light emitting unit during a period of 60 minutes to 120 minutes from the subject's wake-up time adjusting the light emission intensity of the light emitted by the first light emitter, the second light emitter, and the wide light emitter, respectively, so that the color temperature and the amount of mRGC stimulation of the light emitted from the light emitting unit in the time zone of In a time period of 60 minutes to 120 minutes after 10 hours to 12 hours have passed since the wake-up time, the color temperature and mRGC stimulation amount of the light emitted from the light emitting unit are the same as those of the light emitting unit in the other time period. The emission intensity of the light emitted from the first light emitter, the second light emitter, and the wide light emitter is adjusted so that the color temperature and the mRGC stimulation amount of the emitted light are higher than those of the first light emitter, the second light emitter, and the wide light emitter.

(Section 9) The operating method of the light emitting device according to Section 9 is
A method for operating the light-emitting device according to any one of items 4 to 6,
Based on the information stored in the storage unit, the control unit maintains the color temperature of the light emitted from the light emitting unit within a predetermined range, and controls the amount of mRGC stimulation of the emitted light to change. The emission intensity of the light emitted by each of the first light emitter, the second light emitter, and the wide light emitter is controlled.

DESCRIPTION OF SYMBOLS 1... Light-emitting device 10... Light-emitting part 101-105... LED (light-emitting body)
DESCRIPTION OF SYMBOLS 11... Case 12... Board 13... Drive circuit 20... Light emission control part 201... Light emission control circuit 202... Storage part 203... Setting part 204... Wireless communication part 205... Clock circuit 206... External connection terminal 21... Input part 22... Display Part 30... Portable terminal 401... Light guide plate 402... Mirror

Claims

a first light emitter that emits light having a wavelength width characteristic that has a peak wavelength in a wavelength range of 480 nm to 510 nm and a half-value wavelength width on both sides of 20 nm or less; A second light emitter that emits light having a wavelength width characteristic with a half-value wavelength width of 20 nm or less, and a peak wavelength of light emitted by the first light emitter and the second light emitter in a wavelength range of 450 nm to 700 nm. a light-emitting unit including a wide light-emitting body that emits light having different peak wavelengths and having a wavelength width characteristic in which the half-value wavelength width on the long wavelength side is 30 nm or more;
A light-emitting device comprising: a control unit capable of independently controlling emission intensities of light emitted from the first light-emitting body, the second light-emitting body, and the wide light-emitting body.
The wide light emitter is
a third light emitter that emits light having a wavelength width characteristic of having a peak wavelength in a wavelength range of 450 nm to 470 nm, a half-value wavelength width of 20 nm or less on the short wavelength side, and a half-value wavelength width of 50 nm or more on the long wavelength side; ,
a fourth light emitter that emits light having a wavelength width characteristic that has a peak wavelength in a wavelength range of 540 nm to 550 nm and has a half-value wavelength width of 30 nm or more on the short wavelength side and the long wavelength side;
A fifth light emitter that emits light having a wavelength width characteristic of having a peak wavelength in a wavelength range of 620 nm to 650 nm, a half-value wavelength width of 30 nm or more on the short wavelength side, and a half-value wavelength width of 40 nm or more on the long wavelength side. including and
2. The light emitting device according to claim 1, wherein said control section can independently control the light emission intensity of the light emitted by said third to fifth light emitters.
The light-emitting device according to claim 1 or 2, wherein the control section controls the emission intensity of the light emitted by the light emitter so that the color temperature of the light emitted from the light-emitting section is in the range of 2500K to 15000K.
moreover,
a setting unit for setting the color temperature and the amount of mRGC stimulation;
Information indicating the relationship between the color temperature and mRCG stimulus amount of the light emitted from the light emitting unit and the emission intensity of the light emitted by each of the first light emitter, the second light emitter, and the wide light emitter is stored. a storage unit containing
Based on the information, the control unit controls the emission intensity of each light emitter so that the color temperature and the amount of mRCG stimulation of the light emitted from the light emitting unit become the color temperature and the amount of mRCG stimulation set by the setting unit. The light-emitting device according to claim 1 or 2, which controls the .
5. The information stored in the storage unit according to claim 4, wherein the information includes information in which the emission intensity of the light emitter is associated with a plurality of sets having the same color temperature and different mRGC stimulation amounts. luminous device.
5. The information stored in the storage unit according to claim 4, wherein the information includes information in which the emission intensity of the light emitter is associated with a plurality of sets having the same mRGC stimulation amount and different color temperatures. luminous device.
5. The method of operating the light-emitting device according to claim 4, wherein light of a predetermined color temperature and mRGC stimulating amount is emitted in order to adjust the biological rhythm of the subject,
Based on the information stored in the storage unit, the control unit determines that the color temperature and the amount of mRGC stimulation of the light emitted from the light emitting unit during a period of 60 minutes to 120 minutes from the subject's wake-up time adjusting the light emission intensity of the light emitted by the first light emitter, the second light emitter, and the wide light emitter, respectively, so that the color temperature and the amount of mRGC stimulation of the light emitted from the light emitting unit in the time zone of In the time zone from the time 10 hours to 12 hours after the wake-up time to the subject's bedtime, the color temperature and the mRGC stimulation amount of the light emitted from the light emitting unit are the same as the light emission in the other time zone. adjusting the emission intensity of the light emitted by the first light emitter, the second light emitter, and the wide light emitter, respectively, so that the color temperature and the mRGC stimulation amount of the emitted light from the part are smaller than the light emission intensity, respectively. Method.
5. The method of operating the light-emitting device according to claim 4, wherein light of a predetermined color temperature and mRGC stimulating amount is emitted in order to adjust the biological rhythm of the subject,
Based on the information stored in the storage unit, the control unit determines that the color temperature and the amount of mRGC stimulation of the light emitted from the light emitting unit during a period of 60 minutes to 120 minutes from the subject's wake-up time adjusting the light emission intensity of the light emitted by the first light emitter, the second light emitter, and the wide light emitter, respectively, so that the color temperature and the amount of mRGC stimulation of the light emitted from the light emitting unit in the time zone of In a time period of 60 minutes to 120 minutes after 10 hours to 12 hours have passed since the wake-up time, the color temperature and mRGC stimulation amount of the light emitted from the light emitting unit are the same as those of the light emitting unit in the other time period. A method of operating a light-emitting device, wherein the emission intensity of the light emitted by the first light emitter, the second light emitter, and the wide light emitter is adjusted so that the color temperature and the mRGC stimulation amount of the emitted light are greater than .
A method of operating a light emitting device according to claim 4, comprising:
Based on the information stored in the storage unit, the control unit maintains the color temperature of the light emitted from the light emitting unit within a predetermined range, and controls the amount of mRGC stimulation of the emitted light to change. A method of operating a light emitting device, comprising controlling the light emission intensity of light emitted by each of the first light emitter, the second light emitter, and the wide light emitter.