WO2020022008A1

WO2020022008A1 - Light-emission device, lighting system, and control method

Info

Publication number: WO2020022008A1
Application number: PCT/JP2019/026436
Authority: WO
Inventors: 和洋八田; ゆり藤原; 原田　和樹; 山内　健太郎
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2018-07-26
Filing date: 2019-07-03
Publication date: 2020-01-30
Also published as: TWI747012B; CN112042281A; JP7117486B2; JP2020017450A; CN112042281B; TW202019236A

Abstract

A light-emission device (1) that comprises: a light-emission unit (30) that emits light; and a control unit (20) that controls output of light. In a prescribed lit state, the light-emission unit (30) emits light at first output. The control unit (20) has a first mode in which control is performed such that, at least once during a first period, output of light is reduced from a maximum output that is no greater than the first output to a minimum output. The first period is at least 2 seconds but no more than 35 seconds. The minimum output for the first mode is no greater than 325 lm. The maximum output is at least 1.5 times the minimum output.

Description

Light emitting device, lighting system and control method

The present disclosure relates to a light emitting device, a lighting system, and a control method.

Conventionally, a light emitting device that changes light emitted from a light emitting unit is known. For example, the light emitting device of Patent Literature 1 includes a light emitting unit and a control unit that controls the light output of the light emitting surface of the light emitting unit to change periodically.

The control unit controls the sine wave so that the change per unit time in the vicinity where the light output is maximum in one cycle is larger than the change per unit time in the vicinity where the light output is minimum in one cycle. The light emitting unit is controlled so that the light output changes along a wavy curve.

。 It makes it easier for people to adjust their breathing rhythm in accordance with changes in the amount of illumination light, and also makes it easier for people to relax.

Japanese Patent No. 3978334

Therefore, according to the conventional light emitting device, a person can adjust the breathing rhythm while recognizing light whose light output changes periodically with his eyes, but does not feel drowsy. This is because the conventional light-emitting device is not optimized for the lighting mode of light for causing a person to sleepy, and cannot provide a sleep-inducing effect to the person.

The present disclosure provides a light emitting device, a lighting system, and a control method that can provide a sleep inducing effect to a person in a short time by changing the output of light emitted from a light emitting unit.

In order to achieve the above object, a light-emitting device according to an embodiment of the present disclosure includes a light-emitting unit that emits light, and a control unit that controls output of the light, and the light-emitting unit is configured to emit light in a specified lighting state. The control unit emits light at a first output, and the control unit performs a first mode of controlling at least once during a first period to reduce the output of the light from a maximum output equal to or less than the first output to a minimum output. The first period is 2 seconds or more and 35 seconds or less, the minimum output in the first mode is 325 lm or less, and the maximum output is 1.5 times or more the minimum output.

照明 Further, the lighting system according to an embodiment of the present disclosure includes a plurality of light emitting devices.

Further, the control method according to an embodiment of the present disclosure emits light at a first output in a prescribed lighting state, and in a first period, outputs the light at least once from a maximum output equal to or less than the first output, A first mode for controlling the output to be reduced to a minimum output, wherein the first period is 2 seconds or more and 35 seconds or less, the minimum output in the first mode is 325 lm or less, and the maximum output is The minimum output is 1.5 times or more.

According to the light emitting device and the like of the present disclosure, a sleep inducing effect can be given to a person in a short time by changing the output of light emitted from the light emitting unit.

FIG. 1 is a block diagram of the light emitting device according to the first embodiment. FIG. 2A is a diagram illustrating a relationship between a current value and an elapsed time of the light emitting device according to Embodiment 1. FIG. 2B is a diagram illustrating the output of light emitted from the light emitting unit in the vicinity of the minimum output in the first mode. FIG. 2C is a diagram exemplifying the output of light emitted from the light emitting unit near the minimum output in the first mode. FIG. 3 is a diagram illustrating a relationship between a pupil diameter and an elapsed time when light is incident on a human eye. FIG. 4 is a diagram illustrating a relationship between the maximum ratio and the first period. FIG. 5 is a diagram showing the average illuminance when the light emitting device is arranged at a predetermined position on the ceiling. FIG. 6 is a diagram illustrating the relationship between the maximum ratio of the output of the light emitted from the light emitting unit and the minimum output in the first mode. FIG. 7 is a diagram illustrating the relationship between the maximum output and the ratio of the maximum output to the minimum output when the output of the light emitted from the light emitting unit increases from the minimum output to the maximum output in the first mode. is there. FIG. 8 is a diagram illustrating the relationship between the maximum ratio and the second period. FIG. 9A is a diagram illustrating an example in which the output of the light emitted from the light emitting unit is gradually reduced. FIG. 9B is a diagram illustrating an example in which the output of the light emitted from the light emitting unit is gradually reduced. FIG. 9C is a diagram illustrating an example in which the output of light emitted from the light emitting unit is gradually reduced. FIG. 10 is a front view of an eye mask on which a light emitting device is mounted. FIG. 11 is a schematic diagram illustrating a lighting system according to a modification.

(Knowledge underlying the present invention)
In a conventional light emitting device, by changing the output of light emitted from the light emitting device periodically, it is possible to adjust the rhythm of human respiration while recognizing the light with eyes. However, in the conventional light emitting device, the lighting mode for causing drowsiness in a person is not optimized, and it is not possible to give a sleep inducing effect to a person. In order for a person to live a healthy life, it is necessary to secure a sufficient amount of sleep time, and a light-emitting device that gives a sleep-inducing effect to a person is required. Therefore, the inventors have conducted an optional study on a lighting mode of a light emitting device that has an effect of causing a person to sleepy.

As a result, in order to cause drowsiness to a person, the present inventors have found that when reducing the output of the light emitted from the light emitting device from the maximum output to the minimum output in the first period (a period of 2 seconds or more and 35 seconds or less). And the minimum output must be 325 lm or less, and the maximum output must be 1.5 times or more the minimum output.

The inventors have also noticed that drowsiness in humans is caused by fluctuations in the pupil diameter of human eyes. FIG. 3 shows a result of measuring a change in the pupil diameter of a person when the output of the light emitted from the light emitting device is alternately reduced and increased alternately. In FIG. 3, a graph A2 shows a change in the pupil diameter of the subject, and a graph A4 shows a change in the light output of the light emitting device. As shown in FIG. 3A, when periodically fluctuating light enters the human eye, the graph A2 shows that the pupil diameter also changes in accordance with the change in the luminous flux of the graph A4, that is, the brightness of the light. understood. In the graph A2, the person is in a state of starting to feel drowsy. In addition, as shown in FIG. 3B, the graph B2 for adjusting the respiratory rhythm does not show a significant change in the size of the pupil diameter of the person, but the graph B1 of the present disclosure increases the pupil diameter of the person. It has changed greatly, as it has shrunk. From this, it is considered that by changing the light output, the pupil diameter can be varied and a person can be caused to sleepy.

As a finding related to the above, the inventors have found that non-patent documents supporting this result (Nishiyama et al., Evaluation of arousal state using pupil fluctuation as an index, Biomedical Optics, Vol. 46 (2), 2008, pp. .212-217). Non-Patent Documents report that the pupil gradually contracts while the pupil diameter repeatedly shrinks and returns to its original state when the subject sleeps. From this, it can be considered that miosis and mydriasis of the pupil diameter are repeated periodically, and the amplitude is reduced, thereby causing drowsiness to a person.

Therefore, the present disclosure provides a light-emitting device, a lighting system, and a control method that can give a sleep-inducing effect to a person in a short time by changing the output of light emitted from a light-emitting unit.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Each of the embodiments described below shows a comprehensive or specific example. Numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of constituent elements, steps, order of steps, and the like shown in the following embodiments are merely examples, and do not limit the present invention. Further, among the components in the following embodiments, components not described in the independent claims are described as arbitrary components.

図 Each drawing is a schematic diagram, and is not necessarily strictly illustrated. In addition, in each of the drawings, substantially the same configuration is denoted by the same reference numeral, and redundant description will be omitted or simplified.

Hereinafter, a light emitting device, a lighting system, and a control method according to an embodiment of the present disclosure will be described.

(Embodiment)
[Constitution]
A configuration of the light emitting device 1 according to the embodiment of the present disclosure will be described.

FIG. 1 is a block diagram of the light emitting device 1 according to the first embodiment.

As shown in FIG. 1, the light emitting device 1 is a device that can perform illumination in a lighting mode in which light emitted from the light emitting unit 30 alternates between light and dark. The light emitting device 1 is, for example, a bed light, a stand light, or the like, and is used as lighting when a person falls asleep in a bed. The light-emitting device 1 is installed on a facility such as a shelf beside a bed, a side of a bed, or a floor.

The light emitting device 1 includes a control unit 20, a light emitting unit 30, an operation unit 40, and a storage unit 50.

(4) The control unit 20 controls the power supplied to the light emitting unit 30 so that the output of the light emitted from the light emitting unit 30 is changed in a pulsating manner by repeating the magnitude alternately. Specifically, the control unit 20 includes a drive circuit that controls operations of the light emitting unit 30 such as lighting, extinguishing, dimming, and toning. The drive circuit supplies the pulsating power to the light emitting unit 30 so that the brightness of the light emitted from the light emitting unit 30 can be repeated.

The control unit 20 controls the first mode in which the output of the light emitted from the light emitting unit 30 is reduced at least once from the maximum output to the minimum output in the first period, and the output of the light from the light emitting unit 30. There is a second mode for controlling the output to be kept constant, in other words, to maintain the output in the full lighting state (an example of a specified lighting state) (hereinafter referred to as a first output). The control unit 20 can switch between the first mode and the second mode. That is, the first mode and the second mode are exclusively selected. In the present embodiment, the first output exemplifies a case where the light emitting unit 30 is fully lit (lights at an output of 100%). However, the first output is not limited to this. Includes the case of lighting with a lower output. For example, the first output is 80% of the output when the light emitting unit 30 is fully lit, but is not limited to 80% and may be arbitrarily changed. The first output is an output equivalent to the maximum output, but may be larger than the maximum output.

In the first mode, the control unit 20 alternately repeats the operation of decreasing or increasing the output of the light emitted from the light emitting unit 30, that is, the control of alternately repeating the brightness of the light emitted from the light emitting unit 30. I do. This is shown in FIG. 2A. FIG. 2A is a diagram illustrating a relationship between a current value applied to the light emitting unit 30 according to Embodiment 1 and an elapsed time.

As described above, when the light emitting unit 30 is switched from the second mode in which the light emitting unit 30 is fully lit to the first mode, the light emitted from the light emitting unit 30 becomes gradually darker. Gradually becomes brighter. In the first mode, the person is attracted to drowsiness by alternately reducing and increasing the output of the light emitted from the light emitting unit 30.

{Circle around (2)} At least one of the decrease in the output of the light emitted from the light emitting unit 30 and the increase in the output of the light emitted from the light emitting unit 30 change nonlinearly. In the present embodiment, the decrease and increase in the output of the light emitted from the light emitting unit 30 change nonlinearly.

In the present embodiment, the output of the light emitted from the light emitting unit 30 is alternately reduced and increased. However, when the mode is switched from the second mode to the first mode, the light emitted from the light emitting unit 30 is changed. May simply be reduced. For this reason, increasing the output of light emitted from the light emitting unit 30 is not an essential component.

In the first mode, when the brightness of the light emitted from the light emitting unit 30, that is, the decrease and the increase in the output of the light emitted from the light emitting unit 30 are defined as one cycle, one cycle is a first period, a third period, And a second period.

In the first mode, the control unit 20 controls the output of the light emitted from the light emitting unit 30 to decrease from the maximum output to the minimum output in the first period in the brightness of the light emitted from the light emitting unit 30. Perform at least once. The first period is 2 seconds or more and 35 seconds or less. In FIG. 1, the operation of decreasing over the first period is included five times, but the number of reductions is not limited. The maximum output referred to here is an output when the light emitting unit 30 is fully lit. As shown in FIG. 2A, the maximum output indicates, for example, a maximum point when the second period in the first mode has elapsed. Note that the output in the all-lit state is also referred to as a rated output.

Here, the definition of the first output will be described.

In a lighting system including a plurality of light emitting devices 1, the first output is the maximum output of each light emitting device 1, that is, the sum of the maximum outputs of all the light emitting units 30 included in each light emitting device 1, or The sum of the maximum output of each light emitting device 1 that can be set, that is, 100% of the output of light emitted from the lighting system.

For example, when the lighting system includes n light emitting devices 1 and the first outputs of the n light emitting devices 1 are (T1, T2... Tn) lm, respectively, the first output of the lighting system Is (T1 + T2 +... Tn) lm.

The first output of one light emitting device 1 is the maximum output of the light emitting device 1, that is, the total sum of the maximum outputs of all the light emitting units 30 included in the light emitting device 1, or the respective light emitting units 30 that can be set by the user. , Which is 100% of the output of the light emitted from the light emitting device 1.

For example, when two light emitting units 30 are present in one light emitting device 1 and the first output of one light emitting unit 30 is 2500 lm and the other light emitting unit 30 is 3000 lm, this light emitting device The first output of 1 is 5500 lm.

において In the first mode, the minimum output of the light output from the light emitting unit 30 is 325 lm or less. In the first mode, the minimum output of the light emitted from the light emitting unit 30 is 1.5 times or more the maximum output. In the first mode, the minimum output of the light emitted from the light emitting unit 30 is 1/100 or more of the maximum output. The maximum output is, of course, a value greater than the minimum output adjacent to the maximum output.

In the first mode, the control unit 20 further increases the output of the light emitted from the light emitting unit 30 from the minimum output to the next maximum output in the second period after the first period. Perform control. The second period is 2 seconds or more and 32 seconds or less. From the first period and the second period described above, the control period of the first mode is 4 seconds or more. This is derived from the sum of the minimum output of 2 seconds in the first period and the minimum output of 2 seconds in the second period, but may mean that the first period is 4 seconds or more. Note that the upper limit of the control period of the first mode is not particularly limited, and may be several seconds, several tens of seconds, several minutes, tens of minutes, or the like. The upper limit of the control period may be arbitrarily set.

In the present embodiment, the control unit 20 controls the brightness of the light emitted from the light emitting unit 30 in the first mode so that the light emitted from the light emitting unit 30 becomes gradually dark over a first period. Thereafter, over the second period, the light emitted from the light emitting section 30 is controlled so as to gradually become brighter.

In addition, in FIG. 1, the operation of increasing over the second period is included four times, but the number of times of increase is not limited. Further, the first period may be longer, shorter, or the same period as the second period.

As shown in FIG. 2A, in the first mode, after the first period in which the light output from the light emitting unit 30 is reduced from the maximum output to the minimum output, the light output of the light emitting unit 30 is reduced to the minimum output. In the third period. That is, in the first mode, when the output of the light emitted from the light emitting unit 30 becomes the minimum output, the light emitting unit 30 is turned on in the third period with an output near the minimum output, that is, a constant output. The third period is a period between the first period and the second period. In the first mode, the state transits to the third period after the elapse of the first period, and transits to the second period after the elapse of the third period.

記載 Note that the description of “near **” is intended to include not only the point of the minimum output but also within a few percent of this value, taking the description of “near the minimum output” as an example.

一定 The constant output here includes the minimum output shown in FIG. 2A and the light output within an error range of several% of the minimum output. Therefore, the constant output is not limited to the minimum output and being completely constant as in the third period shown in FIG. 2B. FIG. 2B is a diagram illustrating the output of light emitted from the light emitting unit 30 in the vicinity of the minimum output in the first mode.

The third period may be longer or shorter than the first period or the second period.

{Circle around (3)} The third period may not be in the first mode, and the first mode may include a first period and a second period as shown in FIG. 2C. FIG. 2C is a diagram illustrating the output of light emitted from the light emitting unit 30 in the vicinity of the minimum output in the first mode. For this reason, the third period is not an essential component in the first mode.

As shown in FIG. 2A, in the first mode, the rate of change of the output of light emitted from the light emitting unit 30 near the minimum output is smaller than the rate of change of the output of light emitted from the light emitting unit 30 near the maximum output. Control to make it smaller. Specifically, in the first mode, the change per unit time of the output of light emitted from the light emitting unit 30 near the minimum output is per unit time of the output of light emitted from the light emitting unit 30 near the maximum output. Less than the change. For this reason, in the vicinity of the maximum output, the width is narrower than the reference waveform which is, for example, a sine waveform, and in the vicinity of the minimum output, the width is wider than the reference waveform.

The second mode is a mode in which light is emitted from the first output in the fully lit state to illuminate the surroundings, and is a normal illuminating state (full lit state). In the second mode, the control unit 20 merely illuminates the surroundings, and performs control such that the light from the light emitting unit 30 alternates between light and dark so that a person can perceive it, as in the first mode. Absent.

(4) The control unit 20 controls the output of the light emitted from the light emitting unit 30 to gradually change from the output at the end of the first mode to the second output smaller than the first output. In other words, the control unit 20 changes the light output of the light emitting unit 30 at the end of the first mode from the point at which the light output becomes the minimum output to the second output. The second output may be the same output as the minimum output, may be higher or lower than the minimum output, and includes turning off (output is 0).

The light emitting unit 30 is a light emitting module including a substrate and a plurality of LEDs (Light Emitting Diode) mounted on the substrate. The light color of the light emitted from the light emitting section 30 is lower than the neutral white color temperature. The color temperature of the neutral white here is 4600K to 5500K, but the light color of the light emitted from the light emitting unit 30 may be 5000K or less. In particular, the light color of the light emitted from the light emitting section 30 may be the light bulb color or less. The bulb color is, for example, 2600K to 3250K. The light emitting unit 30 is not limited to a light emitting module having an LED, but may be a light bulb.

The board is a printed wiring board on which a plurality of LEDs are mounted, and is formed in a substantially rectangular shape. As the substrate, for example, a resin substrate based on a resin, a metal base substrate based on a metal, a ceramic substrate made of ceramic, or the like can be used.

LEDs include one or more light emitting elements. The plurality of LEDs can emit white light, blue light, and orange light. In the present embodiment, for example, the LEDs are RGB type LEDs that emit blue light, green light, and red light. The LED may be an SMD (Surface Mount Device) type LED or a COB (Chip On On Board) type LED.

Although not shown, the substrate is provided with a signal line for transmitting a control command input from the operation unit 40 and a power line for supplying power from the drive circuit. Each of the plurality of LEDs receives supply of power from a drive circuit via a power line, and emits prescribed light based on a control command from a signal line. By controlling the light emission of each LED, the control unit 20 can change the output of the light emitted from the light emitting unit 30, for example, while alternately repeating light and dark.

The operation unit 40 is an input interface capable of performing an operation of causing the light emitting unit 30 to emit light in the first mode or the second mode, and is a terminal that receives a human instruction. The operation unit 40 has a dedicated input unit for switching to the first mode or the second mode. For example, when a person goes to bed, operating the operation unit 40 and selecting the first mode as an instruction to go to bed causes the light emitting device 1 to start lighting in the first mode.

The operation unit 40 may be capable of arbitrarily setting the light output of the light emitting unit 30 in the first mode. The operation unit 40 may be, for example, an operation panel electrically connected to the light-emitting device 1, and may operate a smartphone, a remote controller, or the like independent of the light-emitting device 1, which can operate the light-emitting device 1 by wireless communication. It may be a panel.

The storage unit 50 stores information such as a control command indicating a lighting mode in the first mode, a control command indicating a lighting mode in the second mode, and a second output. The storage unit 50 is realized by a HDD (Hard Disk Drive) or a semiconductor memory.

[result]
The results of the change in the pupil diameter of the person and the sensory evaluation of the person based on the lighting mode of the light emitting device 1 suitable for inducing drowsiness to the person are shown.

First, FIG. 3 shows a result of measuring a change in the pupil diameter of a person when the output of the light emitted from the light emitting device 1 is alternately reduced and increased alternately.

FIG. 3 is a diagram illustrating the relationship between the pupil diameter and the elapsed time during which light is incident on the human eye. In FIG. 3, the vertical axis represents the pupil diameter of a person, and the horizontal axis represents the elapsed time during which light is incident on the human eye.

ＡA in FIG. 3 shows graphs A1 to A4. The graph A1 shows a change in pupil diameter when the light emitting device 1 is turned off and a person is present in a dark environment. The graph A2 shows a change in the pupil diameter when the light emitting device 1 is turned on in the first mode. Graph A3 shows a change in pupil diameter when illuminated with stationary light. Graph A4 shows the relationship between the luminous flux of light emitted when the light emitting device 1 is turned on in the first mode and the elapsed time in the case of graph A2. For this reason, the graph A4 has no relationship with the pupil diameter indicated by the vertical axis in FIG.

ＡAs shown in FIG. 3A, in the graph A1, it can be seen that the pupil diameter is larger than the other graphs because the person is in a dark environment. In the graph A2, it can be seen that when the light emitting device 1 is turned on in the first mode, the pupil diameter also changes according to the change in the luminous flux in the graph A4, that is, the brightness of the light. Specifically, when the luminous flux of the graph A4 starts to decrease, the pupil diameter of the graph A2 rapidly decreases with a short delay, and after the luminous flux reaches the vicinity of the lower limit, the pupil diameter increases over a period in which the luminous flux increases. Gradually expands. It can be seen that, when the light flux starts to decrease again after the light flux reaches the vicinity of the upper limit value, the pupil diameter rapidly decreases with a slight delay. In the graph A3, since the light output is constant, it can be seen that the change shown in the graph A2 does not appear.

Also in FIG. 3B, the vertical axis indicates the pupil diameter of the person, and the horizontal axis indicates the elapsed time of irradiating the person with light. FIG. 3B shows a graph B1 and a graph B2.

Graph B1 shows the pupil diameter of a person when the light emitting device 1 of the present embodiment is turned on in the first mode. Graph B2 shows the pupil diameter when a light emitting device in which light output is repeatedly reduced and increased, like a conventional light emitting device, is used.

In the graph B1, it can be seen that the pupil diameter of a person changes greatly as the pupil diameter increases or decreases. On the other hand, in the graph B2, although there is some change in the size of the pupil diameter of the person, the change as in the graph B1 is not seen. In other words, it can be understood that the drowsiness of a person cannot be induced by merely repeating light and darkness as in a conventional light emitting device.

Next, a description will be given of setting the first period to 2 seconds or more and 35 seconds or less.

FIG. 4 is a diagram illustrating the relationship between the maximum ratio and the first period. FIG. 4 shows the results of a sensory evaluation experiment for arbitrarily setting six first periods and evaluating whether or not drowsiness is induced by three subjects. In FIG. 4, the vertical axis represents the maximum ratio, and the horizontal axis represents the first period. The maximum ratio means the ratio of the maximum output to the first output.

In FIG. 4, a triangle symbol indicates that all three persons answered that drowsiness was induced (three persons allowed), a diamond symbol indicates a case where all three persons answered that drowsiness was not induced (no permissive), and two persons indicated drowsiness. Is indicated by a square symbol when the answer is “attracted” (allowed by two people).

において In the first period, the points where all three persons did not induce drowsiness were 2.6 seconds and 34.8 seconds. For this reason, 2.6 seconds was set as the shortest period of the first period, 34.8 seconds was set as the longest period of the first period, and the first period was set to 2 seconds or more and 35 seconds or less. If the first period is set to less than 2 seconds, the period during which the output of the light emitted from the light emitting unit 30 is reduced from the maximum output to the minimum output becomes short, and the person feels that the light suddenly becomes dark. If the first period is set longer than 35 seconds, the period during which the output of the light emitted from the light emitting unit 30 is reduced from the maximum output to the minimum output becomes longer, and the person feels as if it is slowly darkening. Therefore, in periods other than the first period, it is considered that periodic fluctuations in the pupil diameter, which appear when feeling drowsy, are unlikely to occur.

Note that, from FIG. 4, the points at which all three persons answered that drowsiness was induced are 4 seconds and 23.6 seconds, so the first period may be set to 4 seconds or more and 23 seconds or less.

Next, since the light flux entering the human eye differs depending on the installation location of the light emitting device 1, the relationship between the installation location and the output of the light emitted by the light emitting unit 30 will be described.

For example, in the case where the light emitting device 1 is installed at the center of the ceiling, if the luminous flux reaching efficiency at which light reaches the eyes of a person sleeping on the bed from the position of the light emitting device 1 installed at the center of the ceiling is assumed to be 100%, Since the amount of light reaching the eyes differs depending on the installation position of the device 1, it is assumed that the maximum output differs. For example, when the light-emitting device 1 is installed on the side of a bed or the like, the luminous flux reaching the eyes may be greatly attenuated.

て Based on this fact, the luminous flux reaching the eyes of a person sleeping on the bed differs depending on the position where the light emitting device 1 is installed.

FIG. 5 is a diagram showing the average illuminance when the light emitting device 1 is arranged at a predetermined position on the ceiling.

5A shows the case where the light emitting device 1 is installed at the center of the ceiling, FIG. 5B shows the case where the light emitting device 1 is installed at the corner of the ceiling, and FIG. 5C shows the case where the light emitting device 1 is installed on the floor. An example is shown. The broken lines in FIGS. 5A to 5C illustrate the positions of the beds.

In FIG. 5A, the average illuminance at the position where the pillows are arranged on the bed is 54.1 lx and the minimum illuminance is 30.1 lx, whereas in FIG. 5B, the average illuminance at the positions where the pillows are arranged on the bed is shown. Is 18.2 lx, and the minimum illuminance is 10.4 lx. In FIG. 5C, the average illuminance is 1.57 lx, and the minimum illuminance is 0.69 lx. That is, assuming that the average illuminance of FIG. 5A is 100%, the ratio of the average illuminance of FIG. 5B to the average illuminance of FIG. The ratio of the average illuminance in FIG. 5C is reduced to about 2.9%. The ratio of the minimum illuminance of FIG. 5B to the minimum illuminance of FIG. 5A is reduced to about 34%, and the ratio of the minimum illuminance of FIG. 5C to the minimum illuminance of FIG. 5A is about 2.3%. Until the minimum illuminance decreases. Since the position of the pillow and the position of the person's head are considered to vary depending on the day, the ratio of the minimum illuminance in FIG. 5C to the minimum illuminance in FIG. Assuming that the error of 0.3% is 10%, it is 2.3% ± 0.23. Since the lower limit of the minimum output in this case is 2.07%, the minimum output of the luminous flux attenuation is set to 2%.

Thus, as shown in FIG. 5C, when the light emitting device 1 is installed on a wall near the floor, the luminous flux reaching from the light emitting device 1 is attenuated by 98% or more. In other words, the light beam from the light emitting unit 30 is attenuated by 1/50.

Therefore, assuming a case where the light flux from the light emitting unit 30 is attenuated by 1/50, FIG. 6 shows the relationship between the maximum ratio of the output of the light emitted from the light emitting unit 30 and the minimum output in the first mode. An example is shown. In FIG. 6, the vertical axis represents the maximum ratio, and the horizontal axis represents the minimum output. FIG. 6 also shows the results of a sensory evaluation experiment for evaluating whether drowsiness is induced by three subjects.

In FIG. 6, a triangle symbol indicates the required period in which all three persons answered that drowsiness was induced, and a diamond symbol indicates the required time in which all three persons indicated that drowsiness was not induced. One person answered that drowsiness was induced. The required period is indicated by a circle symbol.

From the result of FIG. 6, it can be expected that a drowsiness inducing effect is obtained when the minimum output is 1.30 lm or less of the first output of the light emitting unit 30 at such a pillow position. In this case, the minimum output of the light emitted from the light emitting unit 30 needs to be 1.30 × 50 = 65 lm or less. Also, since 1.30 lm is the output of the LED package of the light emitting unit 30, when it is considered as the output of the light emitting device 1, it is necessary to consider the attenuation by the globe and the lens. Although the characteristics differ depending on the material of the glove and the lens, the attenuation rate is generally about 50%. However, the attenuation rate is 20% for gloves that produce soft light to create a space atmosphere. It is also possible that Therefore, 65 × (100/20) = 325 lm. For this reason, the minimum output of the light emitted from the light emitting unit 30 was set to 325 lm or less.

In particular, when the minimum output of the light output at the position of the pillow is set to be smaller than 0.426 lm, in the case of FIG. 5C, the attenuation rate is 98% by the same calculation as described above. May be 0.426 × (100/2) = 21.3 lm.

Next, a description will be given of setting the ratio of the maximum output to the minimum output to 1.5 times or more.

FIG. 7 is a diagram illustrating a relationship between the maximum output and the ratio of the maximum output to the minimum output when the output of the light emitted from the light emitting unit 30 increases from the minimum output to the maximum output in the first mode. is there. In FIG. 7, the vertical axis represents the maximum output, and the horizontal axis represents the ratio of the maximum output to the minimum output. FIG. 7 also shows the results of a sensory evaluation experiment for evaluating whether drowsiness is induced by three subjects. FIG. 7 shows the results of a sensory evaluation experiment performed by three subjects to evaluate whether drowsiness is induced.

In FIG. 7, a triangle symbol indicates that two or more persons have induced drowsiness (two or more persons are allowed), and a diamond symbol indicates that all three persons have not induced drowsiness (no allowable persons). .

As shown in FIG. 7, the minimum output of the ratio of the maximum output to the minimum output in which all three respondents are unacceptable is 1.7 times, and the minimum ratio of the maximum output to the minimum output in which two or more respondents accept it. The output is 2.3 times. For this reason, the ratio of the maximum output to the minimum output was set to 1.5 times or more.

Next, a description will be given of setting the second period to be 2 seconds or more and 32 seconds or less.

FIG. 8 is a diagram illustrating the relationship between the maximum ratio and the second period. In FIG. 8, the vertical axis represents the maximum ratio, and the horizontal axis represents the second period. FIG. 8 also shows the results of a sensory evaluation experiment for evaluating whether drowsiness is induced by three subjects.

In FIG. 8, a triangle symbol indicates that all three persons answered that drowsiness was induced (three persons allowed), and a diamond symbol indicates that all three persons answered that drowsiness was not induced (no allowable persons).

において In the second period, the points where all three persons did not induce drowsiness were 2.6 seconds and 31.4 seconds. For this reason, 2.6 seconds was set as the shortest period of the second period, 31.4 seconds was set as the longest period of the second period, and the second period was set to 2 seconds or more and 32 seconds or less. If the second period is set to less than 2 seconds, a person feels suddenly bright because the period during which the output increases from the minimum output to the maximum output is short. If the second period is set to 32 seconds or more, a person feels that the period during which the output increases from the minimum output to the maximum output becomes long and bright. For this reason, it is considered that it is difficult for a person to feel drowsy by feeling uncomfortable.

8, the second period may be set to be 6 seconds or more and 21 seconds or less based on 6.3 seconds and 20.5 seconds of the point where all three persons answered that drowsiness was induced.

In particular, when the first period is set to 4 seconds or more and 23 seconds or less, and the second period is set to 6 seconds or more and 21 seconds or less, the control period of the first mode includes the minimum output of the first period and the minimum output of the second period. May be 10 seconds or more, which is the sum of

Next, the desirable ratio between the minimum output and the maximum output will be described with reference to FIG. 7 based on the relationship between the minimum output and the maximum output.

わかる As shown in FIG. 7, it can be seen that the answer is acceptable as the ratio of the maximum output to the minimum output increases. From this result, the minimum output was determined to be 1/100 or more of the maximum output.

In particular, the maximum output may be 1/76 or more of the minimum output. Since the minimum output is a value smaller than the maximum output adjacent to the minimum output, it is needless to say that the maximum output is larger than one time of the minimum output.

The minimum output may be an output of light including 0. For this reason, the minimum output is not limited to 1/100 or more of the maximum output.

[Effects]
Next, the effects of the light emitting device 1, the lighting system, and the control method in the present embodiment will be described.

As described above, the light emitting device 1 according to the present embodiment includes the light emitting unit 30 that emits light and the control unit 20 that controls the output of light. In addition, the light emitting unit 30 emits light with the first output in a prescribed lighting state. Further, the control unit 20 has a first mode in which the output of light is controlled at least once in the first period from a maximum output equal to or less than the first output to a minimum output. Further, the first period is 2 seconds or more and 35 seconds or less, and the minimum output in the first mode is 325 lm or less. The maximum output is at least 1.5 times the minimum output.

Thus, by reducing the output of the light emitted from the light emitting unit 30 from the maximum output to the minimum output over the first period, the pupil diameter of the person changes as shown in FIG. In addition, as shown in the results of FIGS. 4, 6 and 7, the first period and the minimum output are optimized in order to give a sleep-inducing effect to a person. Therefore, the control unit 20 reduces the output of the light emitted from the light emitting unit 30 over the first period, that is, gradually changes the surroundings from a bright environment to a dark environment. For this reason, a person feels like being drowsy.

Therefore, by changing the output of the light emitted from the light emitting unit 30, a sleep-inducing effect can be given to a person in a short time.

The lighting system according to the present embodiment includes a plurality of light emitting devices 1.

Further, the control method according to the present embodiment emits light at the first output in the prescribed lighting state, and at least once in the first period, changes the light output from the maximum output equal to or less than the first output to the minimum output. A first mode for controlling to decrease is included. Further, the first period is 2 seconds or more and 35 seconds or less. Further, the minimum output in the first mode is 325 lm or less. The maximum output is 1.5 times or more the minimum output.

において In these cases, the same operation and effect as described above can be obtained.

Further, in the light emitting device 1 according to the present embodiment, in the first mode, the control unit 20 further changes the light output from the minimum output to the next maximum output in the second period after the first period. Control to increase.

As described above, in the first mode, if the output of light emitted from the light emitting unit 30 is reduced and then increased from the minimum output to the maximum output over the second period, the first output from the maximum output to the minimum output is further increased. The output of the light emitted from the light emitting unit 30 is reduced over a period. Accordingly, if the light emitting unit 30 is turned on so as to repeat light and dark of light, a person is more likely to be inviting drowsiness.

In addition, in the light emitting device 1 according to the present embodiment, the second period is 2 seconds or more and 32 seconds or less.

According to this result, from the results in FIG. 8, if the second period is set to less than 2 seconds, the person feels that the period during which the output increases from the minimum output to the maximum output is short and suddenly bright, or the second period is 32 seconds. If the time is longer than the second, the user feels uncomfortable that the period of rising from the minimum output to the maximum output becomes long and bright. For this reason, in the light emitting device 1, even if the light emitting unit 30 increases the output of light in the first mode, it is difficult to prevent a person from sleeping. That is, in the light emitting device 1, the light emitted from the light emitting unit 30 becomes bright, so that it is possible to suppress the person from awakening.

In the light emitting device 1 according to the present embodiment, at least one of the decrease in the light output and the increase in the light output changes nonlinearly.

According to this, since the output of the light emitted from the light emitting unit 30 does not change monotonously, it is possible to approximate the rhythm at which a person is drowsy. This makes it difficult for a person to feel uncomfortable when the light emitted from the light emitting unit 30 becomes darker or brighter, so that drowsiness is easily induced.

In addition, in the light emitting device 1 according to the present embodiment, the minimum output is 1/100 or more of the maximum output.

According to this, from the result of FIG. 7, it is difficult for a person to feel a sense of discomfort when the light emitted from the light emitting unit 30 becomes dark or bright, so that drowsiness is easily induced.

In the light emitting device 1 according to the present embodiment, the control unit 20 reduces the light output to the minimum output in the first mode and further in the third period between the first period and the second period. Control to maintain.

According to this, since the light emitted from the light emitting unit 30 is maintained in the dark state for the third period, the light does not immediately become bright, and the person does not easily feel discomfort. Further, since a dark period can be ensured in one control period in the first mode, drowsiness is more likely to be induced to a person.

In addition, in the light emitting device 1 according to the present embodiment, the minimum output is a light output including 0.

According to this, since the light emitting device 1 can be turned off in the first mode, drowsiness is easily induced in a person.

In the light emitting device 1 according to the present embodiment, in the first mode, the control unit 20 sets the light output such that the rate of change near the minimum output is smaller than the rate of change near the maximum output. Control.

In Patent Literature 1, the above-described light-emitting unit is controlled in order to regulate human breathing. However, when this is applied to drowsiness for humans, different effects are exhibited. In the present embodiment, when the output of the light emitted from the light emitting device 1 is near the minimum output, that is, when the output is dark, a gentle dark environment is maintained, so that the person is less likely to feel uncomfortable and drowsiness is easily induced. Become.

において In the light emitting device 1 according to the present embodiment, the light color of the light is equal to or lower than the neutral white color temperature.

光 Here, the light that people feel comfortable is known as Kruitov's comfortable area. In the comfortable area of Kruitov, color temperature and illuminance are related. In the comfortable area of Kruitov, for example, when the illuminance of light is low, a person feels that the light emitted from the light emitting unit 30 is insidious, cold, or the like. In addition, for example, in a state where the color temperature of light is high, it is said that a person feels the heat emitted from the light emitting unit 30 as hot. From this, the color temperature and the illuminance are related to the light that a person feels comfortable. In order for a person to feel light comfortably, it is preferable that the illuminance and the color temperature fall within a comfortable area of Kruitov where a predetermined relationship is established.

This makes it difficult for a person to feel uncomfortable due to the light color of the light emitted from the light emitting unit 30, so that drowsiness is easily induced.

In the light emitting device 1 according to the present embodiment, the control period of the first mode is 4 seconds or more.

According to this, it is possible to secure a control period (a total of the first period and the second period) when the output of the light emitted from the light emitting unit 30 is reduced and increased once each in the first mode. it can. For this reason, by making the light emitted from the light emitting unit 30 dark or bright, a sleep-inducing effect can be given to a person.

In addition, in the light emitting device 1 according to the present embodiment, the control unit 20 controls the light output from the output at the end of the first mode to the second output smaller than the first output gradually.

According to this, by ending the first mode, for example, a movement of turning off the light of the light emitting device 1 can be represented. Further, if the lighting is maintained in the lighting mode of the light emitting device 1 when the first mode ends, the light emitting device 1 can be used as a nightlight. For this reason, when ending the first mode, it is difficult for the person to feel uncomfortable.

(Modification of Embodiment)
The configuration of the light emitting device 1 of this modification is the same as that of the embodiment unless otherwise specified. The same components are denoted by the same reference numerals, and detailed description of the configurations will be omitted.

In the present modified example, the first mode is to gradually reduce the output of the light emitted from the light emitting unit 30 from the maximum output to the minimum output, and to reduce the output of the light emitted from the light emitting unit 30 to the minimum. At least one operation of increasing stepwise from the output to the maximum output is performed. 9A to 9C show an example in which the output of the light emitted from the light emitting unit 30 decreases stepwise. For example, in FIG. 9A, in the first period, the output of the light emitted from the light emitting unit 30 decreases stepwise from the maximum output to the minimum output. Note that FIG. 9A is merely an example, and the present invention is not limited to this.

段階 Stepwise here means connecting a linear or non-linear line and a linear or non-linear line at an inflection point.

よう As shown in FIG. 9B, the first period may have a plurality of inflection points, that is, three or more stages, and may include a plurality of curves. Further, as shown in FIG. 9C, a section in which the output of light emitted from the light emitting unit 30 is constant may exist in the first period. As a matter of course, in the first period, a period in which the light output of the light emitting unit 30 increases is not provided. Although the first period has been described as an example, the same applies to the second period. Also in the second period, a period during which the light output of the light emitting unit 30 decreases is not provided. Also, in the present modified example, the first mode may further include a third period.

In the light emitting device 1 according to the present modified example, in the first mode, the control unit 20 controls the light output in the first mode to 1) gradually decrease from the maximum output to the minimum output, and 2). At least one of control to increase stepwise from the minimum output to the maximum output is performed.

According to this, by changing at least one of the light output of the light emitting unit 30 in the first period and the light output of the light emitting unit 30 in the second period in a stepwise manner, light suitable for a person is provided. be able to.

(Other modified examples, etc.)
As described above, the present disclosure has been described based on the embodiments and the modifications of the embodiments. However, the present disclosure is not limited to the above embodiments and the modifications of the embodiments. In the following description, the same parts as those of the above-described embodiment and the modified example of the embodiment are denoted by the same reference numerals, and description thereof may be omitted.

For example, in the light emitting device according to the embodiment and the modification of the embodiment, when the light emitting device is turned off and a person operates the operation unit to select the first mode, the control unit is temporarily emitted from the light emitting unit. After the light is turned on at the maximum output of light and a predetermined period elapses, an operation of reducing the output of light emitted from the light emitting unit from the maximum output to the minimum output over a first period is performed one or more times.

In the embodiment and the modification of the embodiment, the light emitting device 1 may be mounted on the eye mask 200 as shown in FIG. FIG. 10 is a front view of an eye mask on which the light emitting device 1 is mounted. In this case, assuming 2% of the first output of the light emitting unit of the light emitting device 1, the minimum output of the first output of the light emitted from the light emitting unit of the light emitting device 1 is 325 × 1/50 = 6.5 lm or less. It may be. In FIG. 10, the light emitting device 1 is arranged on both side surfaces of the eye mask. However, when a person wears the eye mask, the light emitting device 1 may be arranged at a position facing the eyes. The number to be performed is not particularly limited.

Also, the present invention can be implemented as a program for causing a computer to execute the control method in the light emitting device of the embodiment and the modification of the embodiment, and a storage medium for storing the program.

Further, in the light emitting device according to the embodiment and the modification of the embodiment, the light output of the light emitting unit 30 at the end of the first mode changes from the point at which the light output becomes the minimum output to the second output indicated by the two-dot chain line in FIG. May be. A second output indicated by a two-dot chain line exemplifies a nightlight.

In addition, in the embodiment and the modifications of the embodiment, the control unit may not be mounted on the light emitting device. That is, the control unit may be connected to one or more lighting devices (not including the control unit) having the light emitting unit and the operation unit, and control each lighting device as described above.

The present invention may be applied to a lighting system 100 including a plurality of light emitting

devices

1a and 1b according to the embodiment and the modifications of the embodiment. The configuration of each of the

light emitting devices

1a and 1b is the same as that of the light emitting device 1. FIG. 11 is a schematic diagram illustrating a lighting system according to a modification.

In addition, embodiments obtained by applying various modifications conceived by those skilled in the art to the embodiments and the modifications of the embodiments, and configurations in the embodiments and the modifications of the embodiments without departing from the spirit of the present disclosure. A form realized by arbitrarily combining elements and functions is also included in the present disclosure.

1, 1a, 1b Light emitting device 20 Control unit 30 Light emitting unit 100 Lighting system

Claims

A light emitting unit that emits light,
A control unit for controlling the output of the light,
The light-emitting unit emits the light at a first output in a specified lighting state,
The control unit has a first mode for controlling to reduce the output of the light from a maximum output equal to or less than the first output to a minimum output at least once in a first period,
The first period is 2 seconds or more and 35 seconds or less;
The minimum output in the first mode is 325 lm or less;
The light emitting device, wherein the maximum output is at least 1.5 times the minimum output.
The control unit controls the first mode to increase the output of the light from the minimum output to the next maximum output in a second period after the first period. 2. The light emitting device according to 1.
The light emitting device according to claim 2, wherein the second period is between 2 seconds and 32 seconds.
The light emitting device according to claim 2, wherein at least one of the decrease in the light output and the increase in the light output changes nonlinearly.
The control unit controls the output of the light to be kept at the minimum output in the first mode and further in a third period between the first period and the second period. The light-emitting device according to any one of items 4 to 5.
The light emitting device according to any one of claims 1 to 4, wherein the minimum output is 1/100 or more of the maximum output.
The light emitting device according to any one of claims 1 to 5, wherein the minimum output is an output of the light including 0.
In the first mode, the control unit controls the output of the light to decrease stepwise from 1) the maximum output to the minimum output, and 2) from the minimum output to the maximum output. The light-emitting device according to any one of claims 1 to 6, wherein at least one of control for increasing stepwise is performed.
The control unit according to any one of claims 1 to 8, wherein, in the first mode, the light output is controlled such that a change rate near the minimum output is smaller than a change rate near the maximum output. The light emitting device according to claim 1.
The light emitting device according to claim 9, wherein the light color of the light is equal to or lower than a neutral white color temperature.
The light emitting device according to any one of claims 1 to 10, wherein the control period of the first mode is 4 seconds or more.
The control unit according to any one of claims 1 to 11, wherein the control unit controls the output of the light to be gradually changed from an output at the end of the first mode to a second output smaller than the first output. A light-emitting device according to claim 1.
An illumination system comprising a plurality of light emitting devices according to any one of claims 1 to 12.
Emits light at a first output in a prescribed lighting state;
A first mode for controlling the output of the light at least once from a maximum output equal to or less than the first output to a minimum output, at least once,
The first period is 2 seconds or more and 35 seconds or less;
The minimum output in the first mode is 325 lm or less;
The control method wherein the maximum output is 1.5 times or more the minimum output.