JP6258060B2 - Illumination device and illumination method - Google Patents

Description

  The present invention relates to a lighting device and a lighting method for irradiating light that awakens a sleeping user.

  Conventionally, as the illuminating device, there is a technology for starting light irradiation by the light emitting unit from a predetermined time before the wake-up time set by the sleeper, and temporarily increasing the output of the light-emitting unit so as to reach the maximum illuminance at least at the wake-up time. It is disclosed (for example, see Patent Document 1). In addition, it is determined whether or not the patient is in a sleep state based on the number of body movements of the sleeper.

  By the way, it is known that melatonin, a sleep hormone, has an action of inducing natural sleep by adjusting the rhythm of sleep and wakefulness by lowering a person's pulse, body temperature and blood pressure. On the other hand, melatonin is hardly secreted in a bright environment such as daytime when a person is awake. That is, if the illuminance of the light irradiated to the sleeper is increased, the secretion of melatonin is suppressed. If the light of maximum illumination is irradiated when a sleeper wakes up like the past, secretion of melatonin will be suppressed and awakening of a sleeper can be promoted. For this reason, Rea et al. And Takahashi have proposed the degree (inhibition rate) by which light suppresses the secretion of melatonin as an index of arousal level. Here, as described in detail later, the rate of suppression of melatonin secretion was calculated using a model of the photoreceptor mechanism of the biological clock proposed by Rea et al.

JP 2011-87861 A

  In the conventional lighting device, the sleeper is irradiated with light having the maximum illuminance when waking up, so that the eyelid state (the eyelid is closed: hereinafter, simply referred to as the eyelid state) is opened (the eyelid is opened). State: hereinafter, when the state is simply referred to as an open eye state), the sleeper is likely to feel dazzling and may feel uncomfortable. In addition, when the maximum illuminance is reached before the sleeper's awakening timing, it is necessary to maintain the maximum output of the light emitting unit until the user awakens, which wastes power.

  On the other hand, when the maximum illuminance is set low, the glare can be reduced, but since the secretion of melatonin cannot be sufficiently suppressed, the awakening effect on the sleeper becomes low.

  Then, an object of this invention is to provide the highly efficient illuminating device and the illuminating method which can wake up the user during sleep comfortably.

The characteristic configuration of the lighting device according to the present invention is to control at least two light emitting units that respectively irradiate light having different color temperature characteristics when waking up a sleeping user, and to control the illuminance of each of the light emitting units. A light emission control unit that adjusts the illuminance and color temperature of light irradiated to the user so as to set the secretion inhibition rate of the user's melatonin to a predetermined value or more, and the light emission unit is a first light emission unit And a second light emitting unit having a color temperature higher than that of the first light emitting unit, and the light emission control unit reduces the illuminance of the first light emitting unit so as to reduce the total illuminance before the user wakes up. The melatonin secretion inhibition rate is kept constant by decreasing and increasing the illuminance of the second light emitting part .

  As in the prior art, increasing the illuminance from the light emitting unit can increase the melatonin secretion inhibition rate, but even if the illuminance is increased as much as possible, the degree of increase in this inhibition rate gradually decreases. That is, even if the amount of power or wattage is increased to obtain a large illuminance, the melatonin suppression efficiency cannot be increased only by increasing the costs of the light emitting unit, the power control unit, the power consumption, and the like.

  Therefore, in this configuration, paying attention to the point that the secretion of melatonin is suppressed if the correlated color temperature of the light irradiated to the sleeper (hereinafter simply referred to as color temperature) is increased, at least two luminescences having different color temperature characteristics The illuminance and color temperature of the light irradiated to the sleeper are changed. For this reason, it becomes possible to change easily the color temperature of the light irradiated to a sleeper by adjusting the output mode of each light emission part. For example, if the illuminance of the light emitting part with a high color temperature is set larger than the illuminance of the light emitting part with a low color temperature, the melatonin suppression efficiency can be increased even if the total power consumption is the same.

  Furthermore, since the light emission control part of this structure controls the melatonin secretion suppression rate more than predetermined value, it can suppress the secretion of melatonin and can wake a sleeper comfortably. Note that the predetermined value of the melatonin secretion inhibition rate can be set to 60%, for example, as a value that allows a sleeper to wake up comfortably and has high cost performance. Thus, the highly efficient illuminating device which can awaken a sleeper comfortably with the simple structure of changing the illumination intensity and color temperature of the light irradiated to a sleeper has been provided.

  In the closed eye state before shifting to the open eye state, it is important to transmit a lot of light into the sleeper's eyelid and lead to awakening. On the other hand, it is known that the light transmittance of soot is about 10% at the maximum. That is, in the closed eye state, even the illuminance of light that does not feel dazzling may be dazzled in the open eye state. For this reason, it is better to set the light emission illuminance to be smaller in the open state than in the closed state.

  In this configuration, the melatonin secretion inhibition rate is kept constant by increasing the color temperature while decreasing the illuminance of light irradiated to the sleeper before the sleeper awakens. Specifically, the illuminance of the light emitting part with a high color temperature is gradually increased while the illuminance of the light emitting part with a low color temperature is decreased so that the desired melatonin suppression effect can be obtained while reducing the total illuminance. That is, since the illuminance in the open eye state is smaller than the maximum illuminance in the closed eye state, the sleeper in the open eye state does not feel discomfort due to glare. Furthermore, even if the timing of awakening is a little earlier, the melatonin secretion inhibition rate is maintained constant, so that the sleeper can be comfortably awakened.

In another characteristic configuration, the light emission control unit is configured to change only the illuminance of the first light emitting unit during a guidance period from when the light emitting unit starts irradiating light to the user until a first predetermined time elapses. The color temperature is increased to keep the color temperature constant.

  As described above, in the sleep state before the transition to the awake state, it is preferable to transmit a large amount of light inside the bag. It is known that the light transmittance of the kite is higher for light having a longer wavelength than for a shorter wavelength. As in this configuration, by increasing the illuminance of the light emitting part having a low color temperature having a peak of the relative spectral distribution on the long wavelength side, the sleeper can be effectively guided to the awake state.

On the other hand, since the sleeper is still in a sleep state at the initial stage when the light emitting unit starts to irradiate light, if the secretion of melatonin is suppressed excessively, it is accompanied by discomfort. However, as in this configuration, even if the illuminance of the light emitting unit with a low color temperature is increased, the color temperature of the light irradiated to the sleeper is maintained at a constant value. As compared with the case of mixing, the secretion of melatonin is less likely to be suppressed. Therefore, a sleeper can be led to an arousal state without an uncomfortable feeling. Further, the light emission control unit reduces the illuminance of the first light emitting unit and reduces the illuminance of the second light emitting unit in a preparation period from when the first predetermined time has elapsed until the second predetermined time has elapsed. The illuminance and the color temperature may be increased by increasing.

  The characteristic configuration of the illumination method according to the present invention is to increase the illuminance of the first light emitting unit until a first predetermined time elapses from the time when the first light emitting unit starts irradiating the sleeping user with light. The illuminance of the first light emitting unit is decreased so as to increase the illuminance and color temperature of the light irradiated to the user from the time when the first predetermined time elapses until the second predetermined time elapses. And a second step of increasing the illuminance of the second light emitting unit having a color temperature higher than that of the first light emitting unit, and decreasing the total illuminance until the third predetermined time elapses after the second predetermined time elapses. And a third step of increasing the illuminance of the second light-emitting unit while decreasing the illuminance of the first light-emitting unit to maintain the melatonin secretion inhibition rate of the user constant.

  According to the illumination method of this configuration, the illuminance of the first light emitting unit having a low color temperature is increased in the first step to gradually increase the amount of light transmitted through the interior of the bag, and then the color temperature is high in the second step. The illumination of the second light emitting unit is added to reach the maximum illuminance, and the illuminance of the second light emitting unit having a high color temperature is increased while reducing the total illuminance in the third step. As a result, in the first step and the second step, a lot of light is taken into the eyelid to guide the sleeper from the closed eye state to the open eye state, and in the third step, the melatonin secretion is suppressed and comfortably awakened. be able to. In particular, in the third step, in order to reduce the total illuminance, the illuminance of the second light emitting unit having a high color temperature is increased while the illuminance of the first light emitting unit having a low color temperature is decreased, and the melatonin secretion inhibition rate is kept constant. Therefore, an inhibitory effect equivalent to the melatonin secretion suppression rate when the maximum illuminance is reached can be expected. In addition, since the total illuminance of the light emitting unit is reduced, power consumption can be saved. Thus, by adopting the illumination method of this configuration, the energy saving effect can be enhanced and the sleeper can be awakened comfortably.

It is a perspective view of the bedding in this embodiment. It is a schematic diagram of the illuminating device in this embodiment. It is a block diagram of the illuminating device in this embodiment. It is a figure which shows an example of the output control of the light emission part in the present Example 1. FIG. It is a figure which shows the relationship between the mixing ratio of a light emission part, and color temperature. It is a figure which shows the relationship between the color temperature of a light emission part, and illumination intensity. It is a figure which shows the relative spectral distribution with respect to color temperature of a light emission part. It is a figure which shows the relationship between the wavelength of light, and the soot transmittance. It is a figure which shows the relationship between the wavelength of light, and the secretion suppression of melatonin. It is a figure which shows the relationship between illumination intensity and color temperature, and a melatonin secretion suppression rate. It is a figure which shows an example of the output control of the light emission part in the present Example 2. It is a figure which shows an example of the output control of the light emission part in the present Example 3.

  Hereinafter, an embodiment of a lighting device X according to the present invention will be described with reference to the drawings. In the present embodiment, an illumination device X that irradiates light to a person sleeping in a bed Y as a bedding will be described as an example. However, the present invention is not limited to the following embodiments, and various modifications can be made without departing from the scope of the invention.

  As shown in FIG. 1, a bed Y including a bed frame 2 having legs 1 and a mattress 3 mounted on the bed frame 2 is configured. A cabinet 5 connected to the bed frame 2 is arranged in the direction of the head of a person sleeping on the bed Y (an example of a sleeping user, hereinafter referred to as “sleeper”). The lighting device X is installed above the position. Note that the cabinet 5 may be omitted and the lighting device X alone may irradiate light on the sleeper's head.

As shown in FIGS. 2 and 3, the lighting device X in the present embodiment has two light emitting units 6 that irradiate light having different color temperature characteristics when the sleeper is awakened, and the operation of the light emitting unit 6. And a control unit 7 for controlling. The light emitting unit 6 includes a low color illumination 6A (first light emitting unit) and a high color illumination 6B (second light emitting unit), and the color temperature of the high color illumination 6B is higher than the color temperature of the low color illumination 6A. Has been. For example, as shown in FIG. 2, the light emitting unit 6 may be arranged as follows: (1) Separate casing illumination may be used, or (2) Low color illumination 6A and high color illumination 6B are mixed in the same casing. You may let them.
In addition, a diffusion plate 61 formed of a light-transmitting material (polycarbonate, glass, etc.) is provided on the front surface of the light emitting unit 6. The light emitting unit 6 in the present embodiment is configured by LED lighting, and diffuses light of the highly directional LED lighting by the diffusion plate 61 to form a uniform light emitting surface, thereby reducing glare that a sleeper receives. Reduced.
On the other hand, the control unit 7 includes a wake-up time setting unit 71, a time management unit 72, and a light emission control unit 73, as shown in FIG.

  The wake-up time setting unit 71 stores, for example, a wake-up time when a person operates a touch panel or an input button provided in the cabinet 5. In addition, an alarm sound is set to sound according to the wake-up time. The setting of the wake-up time may be input from a portable terminal with an alarm function or may be set by reading information from a wake-up pattern map registered in advance, and is not particularly limited. The set wake-up time signal is transmitted to the time management unit 72 by wire or wirelessly.

The time management unit 72 manages the operation time of the lighting device X from the lighting start time T1 to the awakening time T4. Although details will be described later, as shown in FIG. 4, the period (T1 to T4) managed by the time management unit 72 is an induction period (T1 to T2) for inducing the sleep state of the sleeper to a shallow sleep, and sleep. It is divided into a preparation period (T2 to T3) for suppressing the hormone (melatonin) and awakening the sleeper, and an awakening period (T3 to T4) in which the sleeper actually shifts to the awakening state.
The time management unit 72 outputs the time information to the light emission control unit 73.

  As shown in FIG. 3, the light emission control unit 73 includes an initial control unit 731, a mid-term control unit 732, and a late-stage control unit 733, and low-color illumination according to the period managed by the time management unit 72. Control the output of 6A and high color illumination 6B. Although details will be described later, in the light emission control unit 73 in the present embodiment, the melatonin secretion inhibition rate indicating the degree of decrease with respect to the melatonin secretion reference value immediately before the start of light exposure is equal to or higher than a set value (for example, 60%). Thus, the illuminance of each light emitting unit 6 is controlled.

  The initial control unit 731 performs control to keep the color temperature constant by increasing the illuminance only for the low-color illumination 6A during the induction period (T1 to T2) for guiding to a light sleep (first step). The mid-term control unit 732 illuminates the sleeper by increasing the illuminance of the high color illumination 6B while decreasing the illuminance of the low color illumination 6A during the preparation period (T2 to T3) for awakening the sleeper. Then, control for increasing the color temperature is executed (second step). The late control unit 733 reduces the illuminance of the high-color illumination 6B while reducing the illuminance of the low-color illumination 6A so as to reduce the total illuminance during the awakening period (T3 to T4) in which the sleeper actually shifts to the awakening state. By increasing the color temperature, control is performed to increase the color temperature for a while and maintain the melatonin secretion inhibition rate constant (third step).

Example 1
Then, an example of the illuminating device X which concerns on this embodiment is demonstrated using FIGS. 4-10.
In this embodiment, the low color illumination 6A has a maximum light emission illuminance of 930 Lx (lux) and a color temperature of 2300 K (Kelvin), and the high color illumination 6 B has a maximum light emission illuminance of 900 Lx (lux) and a color temperature of 6700 K. (Kelvin) is set.

  FIG. 5 shows the relationship between the mixing ratio and the color temperature when the outputs of the low color illumination 6A and the high color illumination 6B are adjusted and mixed. The point on the left side of the drawing is the case where the output of the high color illumination 6B is maximized (100%) and the output of the low color illumination 6A is minimized (0%). The output is lowered to increase the output of the low-color illumination 6A. That is, the point on the right side of the drawing is the case where the output of the high color illumination 6B is minimized (0%) and the output of the low color illumination 6A is maximized (100%). As can be seen from FIG. 5, the color temperature continuously changes by adjusting the output mixing ratio of each light emitting unit 6 configured by LED illumination. It can be easily controlled by changing the mixing ratio.

  FIG. 6 is a diagram illustrating the relationship between the color temperature and the illuminance adjusted for the outputs of the low-color illumination 6A and the high-color illumination 6B. The point on the left side of the drawing is the case where the output of the low color illumination 6A is maximized (100%) and the output of the high color illumination 6B is minimized (0%), and the point on the right side of the drawing is the high color illumination 6B. This is a case where the output is maximized (100%) and the output of the low-color illumination 6A is minimized (0%). Further, the maximum output point (about 1900 Lx) in FIG. 6 is a case where the outputs of the low color illumination 6A and the high color illumination 6B are both maximized (100%). That is, from the point on the left side of the drawing to the maximum output point, the output of the low color illumination 6A is maximized (100%) and the output of the high color illumination 6B is gradually increased, and from the maximum output point to the point on the right side of the drawing. The output of the high color illumination 6B is maximized (100%), and the output of the low color illumination 6A is gradually reduced. Thus, the maximum illuminance reached by the illumination device X in this embodiment is about 1900 Lx, and the color temperature can be changed from 2300K to 6700K.

  A method for controlling the output of the light emitting unit 6 in the illumination device X having such optical characteristics will be described. FIG. 7 shows a relative spectral distribution diagram of the low-color illumination 6A and the high-color illumination 6B, where the horizontal axis is the wavelength of light (nm) and the vertical axis is the relative emission intensity. The low-color illumination 6A has a relative emission intensity peak of about 620 nm and a peak in a wavelength region of 600 nm or more, and the high-color illumination 6B has a relative emission intensity peak of about 460 nm and a wavelength region of 600 nm or less. There is a peak.

  By the way, the light that enters the eye is sensed by the photoreceptor cells in the back of the retina, converted into a nerve signal, and then transmitted to the brain. The eyelids are responsible for adjusting the amount of light entering the retina, etc., and sleepers in sleep are closing the eyelids, so the optical signal transmitted to the brain needs to take into account light attenuation by the eyelids. As shown in FIG. 8, it is known that the light transmittance of the eyelid is about 10% when the wavelength of light is around 700 nm, and decreases to about 1 to 2% in the wavelength region of 600 nm or less. For this reason, in order to guide the sleeper from “non-REM sleep” to “wakefulness” through “REM sleep”, it is important to increase the amount of light that permeates the cocoon and is sensed by the photoreceptor cells. In other words, in the induction period (T1 to T2) and the wakefulness preparation period (T2 to T3) for inducing a shallow sleep, a lot of optical signals are transmitted to the sleeper's brain to recognize that they are approaching the wake-up time. Is preferred. Here, “REM sleep” refers to a state in which the brain wave is an early wave close to an awake state in a shallow sleep state, and breathing, heartbeat, and blood pressure are disturbed. “Non-REM sleep” refers to a state in which a deep sleep state is included, an electroencephalogram becomes a slow wave, and respiration, heart rate, and blood pressure are reduced.

  As a measure for awakening a sleeper, a sleep hormone called melatonin that adjusts the rhythm of sleep and awakening is known, and in order to awaken a sleeper, it is necessary to suppress the secretion of melatonin. As shown in FIG. 9, the spectral sensitivity of suppression of melatonin secretion by light has been identified by various studies, and light having a wavelength region near about 460 nm has the highest effect of suppressing the secretion of melatonin. Conversely, light having a wavelength region of 600 nm or more has a small effect of suppressing the secretion of melatonin. That is, if a sleeper is irradiated with low color temperature (long wavelength) illumination (low color illumination 6A), secretion of melatonin is difficult to suppress, and high color temperature (short wavelength) illumination (high color illumination 6B) sleeps. If the person is irradiated, the secretion of melatonin is easily suppressed. As described above, in order to guide the sleep state from the sleep state to the awake state, it is important that the light irradiated to the sleeper from the light emitting unit 6 considers both the light transmission characteristics of the sputum and the secretion suppression characteristics of melatonin. .

  In this embodiment, as shown in FIG. 4, the initial control unit 731 of the light emission control unit 73 has passed a first predetermined time (for example, 20 minutes) from the time when the light emission unit 6 starts irradiating light to the sleeper. In the induction period (T1 to T2) until this is done, the illuminance of the low color illumination 6A is increased and the color temperature is kept constant at 2300K (first step). As a result, by irradiating the bag with light having a peak of emission intensity in a wavelength region of 600 nm or more, the amount of light transmitted through the bag is gradually increased, and the sleeper is gradually guided to a shallow sleep state. That is, by taking a lot of light into the retina through the eyelids, the sleeper can be effectively led to an awake state. Further, since the melatonin secretion is prevented from being rapidly suppressed by maintaining a low color temperature having spectral characteristics in a wavelength region of 600 nm or longer, the sleeper does not lose sleep balance.

  Next, the medium-term control unit 732 of the light emission control unit 73 has a melatonin secretion inhibition rate in the preparation period (T2 to T3) from the time when the first predetermined time has elapsed until the second predetermined time (for example, 3 minutes) has elapsed. The illuminance of the high-color illumination 6B is increased while decreasing the illuminance of the low-color illumination 6A until it reaches about 60%. The maximum illuminance at this time is about 1000 Lx, and the color temperature is about 5000K.

  Here, the relationship between the illuminance, color temperature, and melatonin secretion inhibition rate calculated using the photoreception mechanism model of the biological clock proposed by Reа et al. Will be described with reference to FIG. As is apparent from this figure, the melatonin secretion inhibition rate is increased by increasing the illuminance from the light emitting unit 6. In addition, the melatonin secretion inhibition rate increases as the color temperature of the light emitting unit 6 increases (the spectral sensitivity characteristic shifts to the short wavelength side). On the other hand, this melatonin secretion inhibition rate rapidly decreases in dependence on illuminance when it exceeds 60%. That is, even if the amount of electric power and the wattage of the light emitting unit 6 are increased to obtain a large illuminance, the melatonin secretion suppression rate cannot be increased only by increasing the cost. Therefore, in this example, about 60% was set as the set value as the melatonin secretion inhibition rate at which the sleeper can wake up comfortably and efficiently.

  In this way, in the medium-term control unit 732, the illuminance of the high-color illumination 6B having spectral sensitivity characteristics around 460 nm, which is a wavelength having a high melatonin suppression effect, is reduced to a low-color illumination so that the melatonin secretion suppression rate is about 60%. By mixing with 6A and increasing, preparations from a shallow sleep state to an awake state can be promptly arranged. At this time, if the state in which the maximum illuminance is maintained is continued for a long time as in the prior art, when the sleeper is in an open state, the sleeper easily feels dazzling and feels uncomfortable.

  Therefore, the late control unit 733 reduces the total illuminance in the awakening period (T3 to T4) from the time when the second predetermined time has elapsed until the third predetermined time (for example, 7 minutes) elapses. The illuminance of the high-color illumination 6B is increased while decreasing the illuminance. That is, the illuminance is decreased from the maximum illuminance so that the desired melatonin secretion suppression rate rapidly increased by the medium-term control unit 732 is maintained at a constant value (about 60%). As a result, the desired melatonin inhibitory effect can be exerted and the dazzling eye feel is not felt, so that the sleeper can be awakened comfortably. Moreover, since the total illuminance of the light emitting unit 6 is reduced, power consumption can be saved.

  Control in these light emission control parts 73 is demonstrated using FIG. 10 from a viewpoint of a melatonin secretion suppression rate. In the first step in which the initial control unit 731 executes control, the melatonin secretion inhibition rate gradually increases to around 45% as the illuminance of the low-color illumination 6A increases. At this time, since the light actually transmitted through the sleeper's eyelid is 10% or less, the secretion of melatonin is hardly suppressed. This first step is a period in which the sleeper is still in a sleep state (shallow sleep) and a lot of light signals are transmitted to the brain to induce the sleeper to an awake state. Therefore, it is not preferable to increase the melatonin secretion inhibition rate.

  Next, in the second step in which the medium-term control unit 732 executes control, the melatonin secretion inhibition rate is increased to about 60% suitable for awakening by increasing the high-color illumination 6B while maintaining the illuminance of the low-color illumination 6A. Raise. Since this second step is a period in which the sleeper is in preparation for awakening, it is better to increase the illuminance quickly using the high-color illumination 6B so that the desired melatonin secretion suppression rate is obtained.

  Next, in the third step in which the late control unit 733 executes control, instead of decreasing the illuminance of the low color illumination 6A, the high color illumination 6B is increased to decrease the overall illuminance. Here, it should be noted that, as shown in FIG. 10, the melatonin secretion inhibition rate can maintain the same value as the inhibition rate at the maximum illuminance even though the overall illuminance has decreased from about 1000 Lx to about 800 Lx. It is. That is, even if the low-color illumination 6A having a lower color temperature than the high-color illumination 6B having a higher color temperature is greatly reduced, the melatonin secretion inhibition rate is maintained constant.

(Example 2)
Next, Example 2 according to the present embodiment will be described with reference to FIG. In addition, description is abbreviate | omitted about the same structure as Example 1, and only a different structure is demonstrated.

  In this embodiment, the induction period (T1 to T2) is set short (for example, 8 minutes) and the preparation period (T2 to T3) is set to long (for example, 15 minutes) as compared with the first embodiment. The maximum illuminance is maintained for a predetermined period (T2 ′ to T3). This is effective, for example, when the signal sensitivity with which light transmitted through the eyelid is transmitted to the brain via the retina is relatively low and it takes time to reach an awake state. That is, it is possible to lengthen the time of the maximum illuminance irradiated to the sleeper and sufficiently prepare for the transition to the awake state, so that it is possible to prevent a state where the user does not wake up even when the wake-up time is reached.

(Example 3)
Next, Example 3 according to the present embodiment will be described with reference to FIG. In addition, description is abbreviate | omitted about the same structure as Example 1, and only a different structure is demonstrated.

In the present embodiment, compared with the first embodiment, the induction period (T1 to T2) and the preparation period (T2 to T3) are merged, and the low-color illumination 6A and the high-color illumination 6B are set to be predetermined from the illumination start time T1. Mixing in proportion, gradually increasing the color temperature irradiated to the sleeper. In this case, although the color temperature increases, the sleeper is in a state of closing the heel, so even if the high-color illumination 6B having a low transmittance to the heel is mixed to some extent, the melatonin secretion inhibition rate actually received by the sleeper Does not increase so much.
In Example 1-2, if the sleeper awakens during the induction period (T1 to T2), the melatonin secretion inhibition rate is low, but in this example, the high-color illumination 6B is changed from the illumination start time T1. Since it is used, even if it is unintentionally awakened, a certain degree of melatonin secretion suppression can be expected.

[Another embodiment]
The time management unit 72 of the embodiment described above may include a time change unit (not shown). The time changing unit appropriately determines the intervals of the induction period (T1 to T2), the preparation period (T2 to T3), and the awakening period (T3 to T4) from the biological information regarding the sleep depth of the sleeper. change. For example, when it is determined that there is a high possibility of becoming an arousal state from biological information, the time changing unit shortens the induction period (T1 to T2) and the preparation period (T2 to T3), and quickly reaches the maximum illuminance. Then, the time information is changed so as to shift to the awakening period (T3 to T4). Next, the light emission control unit 73 adjusts the output of the light emitting unit 6 based on the changed time information as in the above-described embodiment.

  Conventionally, a sleep determination device that determines a “sleep depth” by attaching a sleep sensor for detecting a pulse rate or the like to the human body or arranging a load sensor for detecting the number of body movements in the bed Y is known. It has been. In the present embodiment, it is conceivable to link the lighting device X and the sleep determination device. In this case, even if the sleep state of the sleeper fluctuates irregularly every day, the output of the light emitting unit 6 is adjusted in real time, so that the sleeper can always wake up comfortably.

  Note that the time information changed by the time changing unit may be stored as a time map by the time management unit 72 and controlled based on the changed time map at the next bedtime. Moreover, you may make it the structure which memorize | stores a some time map and makes a sleeper select. Furthermore, it is good also as a structure which a person can change time manually by operating a touch panel etc., and various deformation | transformation are possible.

[Other Embodiments]
(1) The maximum illuminance and color temperature characteristics of each light emitting unit 6 in the above embodiment may be any specification as long as the desired melatonin secretion inhibition rate is obtained, and is not particularly limited. Moreover, in the said Example, although the predetermined value of the melatonin secretion suppression rate was set to about 60%, you may change suitably, such as setting to 50%, for example according to the ease of awakening of a sleeper.
(2) In the above-described embodiment, the maximum illuminance at the time point T3 is set to about 1000 Lx. However, for example, the maximum illuminance at the light emitting unit 6 is increased to the maximum illuminance (about 1900 Lx). Also, the illuminance at the time of T2 and T4 is not particularly limited, and various changes can be made without departing from the spirit of the present invention.
(3) In the above embodiment, each light emitting unit 6 is two LED lights having different color temperature characteristics, but may be three or more LED lights having different color temperature characteristics. In addition, the type, quantity, and arrangement of illumination are not particularly limited, such as incandescent bulbs instead of LED illumination.
(4) In the above embodiment, each light emitting unit 6 is installed at an upper position of the cabinet 5, but the light emitting unit 6 may be installed at an intermediate position or a lower position of the cabinet 5 in addition to the upper position. In addition, when the illumination intensity with respect to a sleeper's head can be ensured, you may install the light emission part 6 only in the intermediate position of the cabinet 5, or a downward position.
(5) In the above-described embodiment, a person is exemplified as a sleeper. However, animals other than humans may be sleepers and are not limited.
(6) In the above embodiment, the bed Y is described as an example of the bedding. However, it is not limited to, for example, a futon or a mattress.

  INDUSTRIAL APPLICABILITY The present invention can be used for a lighting device and a lighting method for awakening a sleeping user.

6 Light emitting part 6A Low color illumination (first light emitting part)
6B High color illumination (second light emitting part)
73 Light Emission Control Unit X Lighting Device

Claims (4)

When awakening the user during sleep, at least two light emitting units that respectively emit light having different color temperature characteristics; and
A light emission control unit that controls the illuminance of each of the light emitting units, and adjusts the illuminance and color temperature of the light irradiated to the user so as to set the melatonin secretion inhibition rate of the user to a predetermined value or more. ,
The light emitting unit includes a first light emitting unit and a second light emitting unit having a color temperature higher than that of the first light emitting unit,
The light emission control unit decreases the illuminance of the first light emitting unit and increases the illuminance of the second light emitting unit so as to reduce the total illuminance before the user wakes up, thereby suppressing secretion of the melatonin. Lighting device that keeps the constant . The light emission control unit, in the induction period from the light emitting unit starts to irradiation of light to the user until the first predetermined time has elapsed, the first said color temperature only increases the illuminance of the light emitting portion The lighting device according to claim 1, wherein a constant is maintained. The light emission control unit decreases the illuminance of the first light emitting unit and increases the illuminance of the second light emitting unit in a preparation period from when the first predetermined time has elapsed until the second predetermined time has elapsed. The illumination device according to claim 1, wherein the illuminance and the color temperature are increased. A first step of increasing the illuminance of the first light emitting unit until a first predetermined time has elapsed from the time when the first light emitting unit starts irradiating light to a sleeping user;
The illuminance of the first light emitting unit is decreased and the first illuminance is decreased so as to increase the illuminance and color temperature of the light irradiated to the user from the time when the first predetermined time has elapsed until the second predetermined time has elapsed. A second step of increasing the illuminance of the second light emitting unit having a higher color temperature than the light emitting unit;
The illuminance of the second light emitting unit is increased while the illuminance of the first light emitting unit is decreased so as to decrease the total illuminance until the third predetermined time elapses after the second predetermined time has elapsed, and the use A third step of maintaining a constant melatonin secretion inhibition rate of the person.

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