lighting fixtures

Abstract

To provide a lighting apparatus comprising a light-emitting element which is appropriate for prioritizing sympathetic nerve or parasympathetic nerve in accordance with a life pattern and an environment of a user.SOLUTION: A lighting apparatus 1 comprises a first light-emitting element 310, a second light-emitting element 320 and a light emission control section 2. The first light-emitting element 310 emits first white light W1. The second light-emitting element 320 emits second white light W2. The light emission control section 2 individually controls a light-emitting state of the first light-emitting element 310 and a light-emitting state of the second light-emitting element 320. A maximum light emission intensity MX1 in a wavelength range A1 from 400 nm or more to 480 nm or less off the first white light W1 is greater than a maximum light emission intensity MX2 in the wavelength range A1 from 400 nm or more to 480 nm or less of the second white light W2. A difference d1 between a maximum light emission intensity a1 and a minimum light emission intensity a2 in a wavelength range A2 from 500 nm or more to 600 nm or less of the first white light W1 is larger than a difference between a maximum light emission intensity b1 and a minimum light emission intensity b2 in the wavelength range A2 from 500 nm or more to 600 nm or less of the second white light W2.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a lighting fixture. [Background technology]

[0002] The lighting system described in Patent Document 1 includes a lighting device that emits light and a control unit that controls the lighting of the lighting device. Additionally, the lighting system further includes a measurement unit that measures a user's level of concentration during the day and outputs an input signal indicating the level of concentration, and a CPU that generates a control signal that sets a lighting pattern for the lighting device before and after the user goes to sleep based on the input signal received from the measurement unit. With this configuration, the dimming rate and color temperature during sleep are controlled as an index of the user's level of concentration during the day, thereby realizing an appropriate lighting environment before and after the user goes to sleep.

[0003] Specifically, the lighting device includes a light source. The light source is composed of two LED groups, each consisting of a plurality of LEDs. One of the LED groups is composed of LED chips that emit light with a relatively high color temperature, and the other is composed of LED chips that emit light with a relatively low color temperature. The control unit determines the dimming rates of the two LED groups that emit light with a high color temperature and light with a low color temperature based on the received control signal, and controls the light source to light for a predetermined period of time in accordance with each input signal, in accordance with the timing of the timer.

[0004] For example, setting the dimming rate to 30% or less and the color temperature to 3000K or less will promote the release of melatonin in the user. Furthermore, the exposure time with this low dimming and low color temperature is set to a relatively long period, from when the lights start turning on before bedtime until they stop turning on before bedtime. This promotes the release of melatonin in the user who has gone to sleep, allowing the user, who has been working with a high level of concentration during the day, to fall asleep comfortably. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-058322 Summary of the Invention [Problem to be solved by the invention]

[0006] The lighting system described in Patent Document 1 is a type of technology for dominating the parasympathetic nervous system, as it promotes melatonin secretion. However, it is unclear which high color temperature LEDs and low color temperature LEDs are suitable for dominating the parasympathetic nervous system in the lighting system described in Patent Document 1. On the other hand, there are many times when it is necessary to dominate the sympathetic nervous system, such as during the daytime.

[0007] Therefore, the inventors of the present application have conducted extensive research into light-emitting elements suitable for giving dominance to the sympathetic nervous system or the parasympathetic nervous system depending on the user's lifestyle and environment.

[0008] An object of the present invention is to provide a lighting fixture equipped with light-emitting elements suitable for giving dominance to the sympathetic nervous system or the parasympathetic nervous system depending on the user's lifestyle and environment. [Means for solving the problem]

[0009] The lighting device disclosed in the present application includes a first light-emitting element, a second light-emitting element, and a light-emission control unit. The first light-emitting element emits a first white light. The second light-emitting element emits a second white light. The light-emission control unit individually controls the light-emitting state of the first light-emitting element and the light-emitting state of the second light-emitting element. The maximum light-emitting intensity of the first white light in a wavelength range of 400 nm to 480 nm is greater than the maximum light-emitting intensity of the second white light in a wavelength range of 400 nm to 480 nm. The difference between the maximum light-emitting intensity and the minimum light-emitting intensity of the first white light in a wavelength range of 500 nm to 600 nm is greater than the difference between the maximum light-emitting intensity and the minimum light-emitting intensity of the second white light in a wavelength range of 500 nm to 600 nm.

[0010] In the lighting device disclosed in the present application, it is preferable that the color rendering properties of the second light emitting element are higher than the color rendering properties of the first light emitting element.

[0011] In the lighting device disclosed in the present application, it is preferable that the light-emitting control unit individually controls the light-emitting state of the first light-emitting element and the light-emitting state of the second light-emitting element depending on the time of day in accordance with a schedule set in the light-emitting control unit. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide a lighting fixture equipped with a light-emitting element suitable for giving dominance to the sympathetic nervous system or the parasympathetic nervous system depending on the user's lifestyle pattern and environment. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a block diagram illustrating a lighting system according to an embodiment of the present invention. [Figure 2] FIG. 2 is a plan view illustrating an example of a light source according to the present embodiment. [Figure 3] 4 is a diagram showing an emission spectrum of a first light-emitting element, an emission spectrum of a second light-emitting element, and a sunlight spectrum according to the present embodiment. FIG. [Figure 4] 10 is a diagram showing the emission spectrum of the first light-emitting element, the emission spectrum of the second light-emitting element, and the sunlight spectrum from another perspective according to the embodiment. FIG. [Figure 5] FIG. 10 is a diagram showing an emission spectrum of a first light-emitting element, an emission spectrum of a second light-emitting element, and a sunlight spectrum according to a first modified example of the present embodiment. [Figure 6] FIG. 10 is a diagram showing an emission spectrum of a first light-emitting element, an emission spectrum of a second light-emitting element, and a sunlight spectrum according to a second modified example of the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference characters and description thereof will not be repeated.

[0015] An illumination system 100 according to an embodiment of the present invention will be described with reference to Figures 1 to 4. Figure 1 is a diagram showing the illumination system 100.

[0016] 1, lighting system 100 includes at least one lighting fixture 1. In this embodiment, lighting system 100 includes multiple lighting fixtures 1. Lighting system 100 may further include a lighting control device 200. The lighting control device 200 will be described later.

[0017] Lighting device 1 is illuminated by AC power source A. In this embodiment, operator S is an external switch. The external switch may be, for example, a wall switch. A user can turn lighting device 1 on and off by operating operator S. Alternatively, the user may turn lighting device 1 on and off using a remote control.

[0018] The lighting device 1 includes a light-emission control unit 2 and a light source 3. The lighting device 1 may further include a communication unit 4, a timer unit 5, and a spectral sensor 6. The communication unit 4, the timer unit 5, and the spectral sensor 6 will be described later.

[0019] The light-emission control unit 2 turns on the light source 3. The light-emission control unit 2 also controls the light intensity and / or light color of the light source 3. Controlling the light intensity corresponds to an example of "dimming." Controlling the light color corresponds to an example of "color adjustment." In this embodiment, the user can adjust the light intensity or color by performing a pull-less operation on the operator S. A pull-less operation refers to an operation in which the operator S is switched from on to off and then switched from off to on within a predetermined time range. The predetermined time is, for example, 1.5 seconds or less. The operator S may also include, for example, a slider or a button. The button may be a physical button or a software button displayed on the display. In this case, the user can adjust the light intensity or color using the slider or button. Furthermore, the user may adjust the light intensity or color by operating a remote control.

[0020] The light source 3 includes at least one first light-emitting element 310 and at least one second light-emitting element 320. In this embodiment, the light source 3 includes a plurality of first light-emitting elements 310 and a plurality of second light-emitting elements 320. The plurality of first light-emitting elements 310 constitute a first light-emitting element group 31. The plurality of first light-emitting elements 310 are connected in series. The plurality of second light-emitting elements 320 constitute a second light-emitting element group 32. The plurality of second light-emitting elements 320 are connected in series. The first light-emitting element 310 and the second light-emitting element 320 include LEDs (Light Emitting Diodes). The light-emitting control unit 2 individually controls the light-emitting state of the first light-emitting element 310 and the light-emitting state of the second light-emitting element 320.

[0021] FIG. 2 is a plan view showing an example of a light source 3 according to this embodiment. As shown in FIG. 2, the light source 3 further includes a substrate 33. The first light-emitting elements 310 and the second light-emitting elements 320 are mounted on the substrate 33. The first light-emitting elements 310 and the second light-emitting elements 320 are alternately arranged along a first direction D1. The first light-emitting elements 310 and the second light-emitting elements 320 are alternately arranged along a second direction D2. The first direction D1 and the second direction D2 are perpendicular to each other. The first light-emitting elements 310 and the second light-emitting elements 320 are, for example, surface-mounted device (SMD) elements or chip-on-board (COB) elements. Note that the number and arrangement of the first light-emitting elements 310 and the second light-emitting elements 320 are not particularly limited as long as dimming or color adjustment can be performed.

[0022] The first light-emitting element 310 emits a first white light (hereinafter referred to as "first white light W1"). Specifically, the first light-emitting element 310 has a first light-emitting diode that emits blue light and a first fluorescent section. The first fluorescent section includes a yellow fluorescent material. The yellow fluorescent material converts the wavelength of part of the blue light emitted by the first light-emitting diode to emit yellow light. The other part of the blue light is transmitted through the first fluorescent section. Therefore, the blue light and the yellow light are combined, and the first white light W1 is emitted from the first light-emitting element 310.

[0023] The second light-emitting element 320 emits second white light (hereinafter referred to as "second white light W2"). ​​Specifically, the second light-emitting element 320 has a second light-emitting diode that emits purple light and a second fluorescent unit. The second fluorescent unit includes one or more types of special phosphors. The one or more types of special phosphors wavelength-convert part of the purple light emitted by the second light-emitting diode and emit visible light according to the type of special phosphor. The other part of the purple light passes through the second fluorescent unit. Therefore, the purple light and the visible light emitted by the special phosphor are combined, and second white light W2 is emitted from the second light-emitting element 320.

[0024] The color temperature of the first white light W1 is higher than the color temperature of the second white light W2. In other words, the first light-emitting element 310 is a light-emitting element with a high color temperature. The higher the color temperature of the light emitted by a light-emitting element (e.g., an LED), the higher the luminous efficiency. Therefore, the luminous efficiency of the first light-emitting element 310 is higher than that of the second light-emitting element 320. Therefore, by using the first light-emitting element 310, a desired illuminance can be achieved with less power consumption. The luminous efficiency indicates the luminous flux value per unit power provided to a light-emitting element (e.g., an LED). The unit of luminous efficiency is "lumen / watt." Furthermore, when the first light-emitting element 310 with a high color temperature is turned on, the user's sympathetic nervous system is dominant, which is effective for activities such as work and study. The sympathetic nervous system, for example, leads the mind and body to a state of activity and tension.

[0025] The second light-emitting element 320 is a light-emitting element with a low color temperature. Therefore, the color rendering of the second light-emitting element 320 is higher than that of the first light-emitting element 310. In addition, the emission spectrum SP21 (see FIG. 3) of the low-color-temperature second light-emitting element 320 is a full spectrum similar to the sunlight spectrum SP (see FIG. 3). Therefore, when the low-color-temperature second light-emitting element 320 is turned on, the user's parasympathetic nervous system is dominant, which is effective for reducing fatigue and achieving good sleep, for example. The parasympathetic nervous system, for example, leads to a calm and relaxed state of mind and body.

[0026] Here, color rendering is an index that indicates the difference in the color appearance of an object illuminated by light emitted by a light-emitting element compared to the color appearance of an object illuminated by reference light (typically sunlight). The higher the color rendering of the light emitted by the light-emitting element, the closer the color appearance of the object will be to the color appearance of the object illuminated by the reference light.

[0027] Color rendering properties are indicated by color rendering indexes. In this embodiment, it is preferable to use a light-emitting element with a high general color rendering index (Ra: average value of R1 to R8) or a high specific color rendering index (Ra: R1 to R15) as the second light-emitting element 320. However, since the Ra value has a small number of colors for evaluation and is somewhat unreliable, it is more preferable to use a light-emitting element that has been highly evaluated by an evaluation index with a larger number of colors for evaluation as the second light-emitting element 320. An example of an evaluation index with a larger number of colors for evaluation is the TM30-15 evaluation index. The TM30-15 evaluation index has 99 colors and is more reliable in terms of color reproducibility and fidelity.

[0028] The second light-emitting element 320 emits a second white light W2 having a full spectrum.

[0029] 3 is a diagram showing an emission spectrum SP1 of the first light-emitting element 310, an emission spectrum SP21 of the second light-emitting element 320, and a sunlight spectrum SP according to this embodiment. In Fig. 3, the horizontal axis represents wavelength (nm), and the vertical axis represents spectral intensity (arbitrary unit).

[0030] As shown in FIG. 3, the maximum emission intensity MX1 of the first white light W1 in the wavelength range A1 of 400 nm to 480 nm is greater than the maximum emission intensity MX2 of the second white light W2 in the wavelength range A1 of 400 nm to 480 nm. Additionally, the difference d1 (specifically, the absolute value of the difference d1) between the maximum emission intensity a1 and the minimum emission intensity a2 of the first white light W1 in the wavelength range A2 of 500 nm to 600 nm is greater than the difference d2 (specifically, the absolute value of the difference d2) between the maximum emission intensity b1 and the minimum emission intensity b2 of the second white light W2 in the wavelength range A2 of 500 nm to 600 nm. Therefore, the spectral curve representing the emission spectrum SP21 of the second white light W2 exhibits gentler characteristics (curves) than the spectral curve representing the emission spectrum SP1 of the first white light W1. As a result, the emission spectrum SP21 of the second white light W2 resembles the sunlight spectrum SP. Therefore, the second light-emitting element 320 is suitable as a light-emitting element for giving dominance to the parasympathetic nerves of the user.

[0031] The light-emitting control unit 2 shown in Fig. 1 separately controls the light-emitting state of the first light-emitting element 310, which is suitable for dominating the sympathetic nervous system, and the light-emitting state of the second light-emitting element 320, which is suitable for dominating the parasympathetic nervous system. As a result, a lighting environment can be created that suits the user's lifestyle and environment. In this case, the "user's environment" refers to, for example, the brightness of the user's surrounding environment (natural environment) over time.

[0032] In other words, according to this embodiment, it is possible to provide a lighting device 1 equipped with light-emitting elements (first light-emitting element 310 and second light-emitting element 320) suitable for giving dominance to the sympathetic nervous system or the parasympathetic nervous system depending on the user's lifestyle pattern and environment.

[0033] 3, the emission spectrum SP21 of the second light-emitting element 320 is similar to the sunlight spectrum SP, and the color rendering of the second light-emitting element 320 is high. Therefore, the second light-emitting element 320 is suitable for stabilizing the circadian rhythm of the user.

[0034] Circadian rhythms are physiological phenomena that fluctuate on a cycle of approximately 25 hours. Circadian rhythms are thought to affect various human physiological functions, such as sleep / wakefulness, hormone secretion such as melatonin, and energy metabolism. Therefore, it is speculated that stabilizing circadian rhythms will contribute to preventing the decline of human physiological functions.

[0035] 3, the emission spectrum SP1 of the first light-emitting element 310 with a high color temperature is not a full spectrum. In this embodiment, only the second light-emitting element 320 with a low color temperature has a full spectrum emission spectrum SP21. Therefore, compared to when both the first light-emitting element 310 and the second light-emitting element 320 have full spectra, the light-emitting efficiency is higher and power consumption can be reduced.

[0036] Returning to Fig. 1, the light-emission control unit 2 will be described. The light-emission control unit 2 includes a light-source driving unit 21 and a control unit 22. The light-source driving unit 21 drives the light source 3. That is, the light-source driving unit 21 drives the first light-emitting element 310 and the second light-emitting element 320. The control unit 22 controls the light-source driving unit 21 to adjust the light intensity and / or color of the light source 3.

[0037] The control unit 22 is a computer such as an MCU (Micro Controller Unit). Specifically, the control unit 22 includes a control unit 221 and a storage unit 222. The control unit 221 is, for example, a processor. The storage unit 222 is, for example, a semiconductor memory. The storage unit 222 stores computer programs and data. The control unit 221 executes the computer program stored in the storage unit 222 to control the light source driving unit 21.

[0038] The light source driving unit 21 drives the light source 3 under the control of the control unit 22. Specifically, the light source driving unit 21 includes an AC / DC conversion circuit 211 and a constant current circuit 212. The AC / DC conversion circuit 211 converts an AC voltage supplied from an AC power source A into a DC voltage. The constant current circuit 212 generates a constant current based on the DC voltage output by the AC / DC conversion circuit 211.

[0039] Specifically, the constant current circuit 212 generates a first current I1 and a second current I2. The first current I1 and the second current I2 are supplied to the first light-emitting element 310 and the second light-emitting element 320, respectively, via different power supply lines. Therefore, the first current I1 flows through the first light-emitting element 310. As a result, the first light-emitting element 310 generates a first white light W1. The second current I2 flows through the second light-emitting element 320. As a result, the second light-emitting element 320 generates a second white light W2. The dimming of the light source 3 is performed by mixing the first white light W1 and the second white light W2.

[0040] Schedule-based light emission control will be described with continued reference to Fig. 1. In this embodiment, the light emission control unit 2 individually controls the light emission state of the first light emitting element 310 and the light emission state of the second light emitting element 320 according to the time of day, in accordance with a schedule set in the light emission control unit 2. Therefore, a lighting environment can be reliably created based on the schedule, in accordance with the user's lifestyle pattern (behavioral pattern) and environment, so as to give dominance to the user's sympathetic nerves or parasympathetic nerves in accordance with each time of day.

[0041] Specifically, the storage unit 222 of the control unit 22 stores schedule data SC. The schedule data SC indicates a schedule for controlling the light source 3. Therefore, by storing the schedule data SC in the storage unit 222, a schedule is set for the light-emission control unit 2. The schedule is configured by arranging one or more pieces of light-emission control information (hereinafter referred to as "light-emission control information CNT") on a time axis. The light-emission control information CNT includes light-mixing information indicating a light-mixing ratio between the first white light W1 and the second white light W2. The light-mixing ratio indicates, for example, the ratio between the light intensity of the first white light W1 and the light intensity of the second white light W2. The larger the current value of the first current I1, the greater the light intensity of the first white light W1. The larger the current value of the second current I2, the greater the light intensity of the second white light W2.

[0042] Therefore, the control unit 221 of the control unit 22 controls the light mixing ratio between the first white light W1 and the second white light W2 by controlling the current values ​​of the first current I1 and the second current I2 via the light source drive unit 21 based on the light mixing information. That is, the control unit 221 controls the light mixing ratio between the first white light W1 and the second white light W2 by individually controlling the light emission state of the first light-emitting element 310 and the light emission state of the second light-emitting element 320 based on the light mixing information. In this way, the control unit 221 performs color adjustment of the light source 3 by controlling the light mixing ratio between the first white light W1 and the second white light W2 based on the light mixing information. Note that the light mixing ratio may be represented by, for example, the ratio between the current value of the first current I1 and the current value of the second current I2, and the method for defining the light mixing ratio is not particularly limited.

[0043] Furthermore, the light emission control information CNT preferably includes on / off information for the light source 3. The on / off information indicates the turn-on and turn-off times for the light source 3. The control unit 221 controls the turn-on and turn-off of the light source 3 via the light source drive unit 21 based on the on / off information. Furthermore, the light emission control information CNT preferably includes dimming information (light intensity information) for dimming the light source 3. The control unit 221 performs dimming of the light source 3 via the light source drive unit 21 based on the dimming information.

[0044] In detail, the timer 5 measures time and outputs information indicating the time to the control unit 221. The control unit 221 then controls the light-emitting state of the first light-emitting element 310 and the light-emitting state of the second light-emitting element 320 based on the information indicating the time acquired from the timer 5 and each piece of light-emitting control information CNT arranged on the time axis in the schedule data SC. Specifically, the schedule data SC associates time with the light-emitting control information CNT. Therefore, when the time indicated by the schedule data SC arrives, the control unit 221 controls the light-emitting state of the first light-emitting element 310 and the light-emitting state of the second light-emitting element 320 based on the light-emitting control information CNT associated with the time.

[0045] More specifically, when the time indicated by the schedule data SC arrives, the control unit 221 controls the light emitting state of the first light emitting element 310 and the light emitting state of the second light emitting element 320 based on the light mixing information associated with the time, thereby performing color adjustment of the light source 3. Furthermore, when the time indicated by the schedule data SC arrives, the control unit 221 controls the light emitting state of the first light emitting element 310 and the light emitting state of the second light emitting element 320 based on the on / off information associated with the time, thereby performing turning on and off of the light source 3. Furthermore, when the time indicated by the schedule data SC arrives, the control unit 221 controls the light emitting state of the first light emitting element 310 and the light emitting state of the second light emitting element 320 based on the dimming information associated with the time, thereby performing dimming of the light source 3.

[0046] For example, when performing color adjustment, the light mixing ratio of the light-emission control information CNT is set in the schedule data SC so that the amount of light of the first white light W1 is greater than the amount of light of the second white light W2 during daytime hours when the user is active. On the other hand, when performing color adjustment, the light mixing ratio of the light-emission control information CNT is set in the schedule data SC so that the amount of light of the second white light W2 is greater than the amount of light of the first white light W1 during nighttime hours when the user is relaxing.

[0047] For example, when performing color adjustment, the ratio of the light intensity of the second light-emitting element 320 (the current value of the second current I2) in the light-emission control information CNT is gradually increased as the time progresses from daytime to evening in the schedule data SC. As a result, the user's circadian rhythm is stabilized, and the user's sleep can be helped with good regularity.

[0048] Continuing with reference to Figure 1, an example of a method for creating schedule data SC based on a user's lifestyle patterns (behavioral patterns) will be described. Lighting control device 200 controls multiple lighting fixtures 1. Lighting control device 200 also communicates with communication unit 4 of each lighting fixture 1. Communication unit 4 is a communication module.

[0049] Each lighting fixture 1 transmits operation information for the lighting fixture 1 via a control S or a remote control to the lighting control device 200. The lighting control device 200 receives the operation information from each lighting fixture 1. The lighting control device 200 then analyzes the user's lifestyle pattern (behavior pattern) based on the operation information for each lighting fixture 1. In other words, the lighting control device 200 recognizes the user's lifestyle pattern (behavior pattern) based on the operation information for each lighting fixture 1.

[0050] For example, lighting control device 200 acquires operation information from lighting fixtures 1 in the living room, dining room, kitchen, and bathroom for a predetermined period (e.g., one week). Lighting control device 200 then analyzes the user's lifestyle patterns (behavioral patterns) based on the operation information from each lighting fixture 1.

[0051] Lighting control device 200 then determines light-emission control information CNT for each lighting device 1 based on the user's lifestyle pattern (behavior pattern). Lighting control device 200 then generates schedule data SC for each lighting device 1, including the light-emission control information CNT for each time. Lighting control device 200 then transmits the corresponding schedule data SC to each lighting device 1.

[0052] The communication unit 4 of each lighting fixture 1 receives the corresponding schedule data SC from the lighting control device 200. Then, in each lighting fixture 1, the control unit 221 stores the schedule data SC in the storage unit 222.

[0053] For example, a user can change or delete schedule data SC for each lighting fixture 1 by operating lighting control device 200 via lighting control device 200. A user may also change or delete schedule data SC by directly operating each lighting fixture 1. A user may also create schedule data SC directly by operating lighting control device 200 or a lighting fixture 1.

[0054] 1, by creating the schedule data SC according to the user's lifestyle pattern (behavior pattern), it is possible to control the light emission states of the first light-emitting element 310 and the second light-emitting element 320 according to the user's lifestyle pattern (behavior pattern). In other words, it is possible to adjust the brightness and color of the light source 3 according to the user's lifestyle pattern (behavior pattern).

[0055] Continuing with reference to FIG. 1 , light-emission control based on the spectral sensor 6 will be described. The spectral sensor 6 measures the light spectrum of the ambient environment of the lighting device 1 and outputs the detected light spectrum to the light-emission control unit 2. The light-emission control unit 2 individually controls the light-emission states of the first light-emitting element 310 and the second light-emitting element 320 based on the detected light spectrum of the ambient environment of the lighting device 1. Specifically, the control unit 221 individually controls the light-emission states of the first light-emitting element 310 and the second light-emitting element 320 via the light source driver 21 based on the detected light spectrum of the ambient environment of the lighting device 1. Therefore, according to this embodiment, the light source 3 can be dimmed and adjusted to a desired color according to the ambient environment of the lighting device 1.

[0056] For example, if the light spectrum of the environment surrounding lighting device 1 during the daytime is similar to the sunlight spectrum SP, light-emission control unit 2 determines that sufficient sunlight is entering the location where lighting device 1 is installed. Then, light-emission control unit 2 controls light source driver 21 to turn off second light-emitting element 320 with a low color temperature.

[0057] Next, the characteristics of the first white light W1 and the second white light W2 will be described from another perspective with reference to Fig. 4. Fig. 4 is a diagram showing the emission spectrum SP1 of the first light-emitting element 310, the emission spectrum SP21 of the second light-emitting element 320, and the sunlight spectrum SP according to this embodiment from another perspective.

[0058] As shown in FIG. 4, the peak PK1 of the emission spectrum SP1 of the first white light W1 emitted by the first light-emitting element 310 is present in the first wavelength range R1. The peak PK1 indicates the maximum value Vpk1 (global extremum) in the entire wavelength range of the emission spectrum SP1. The first wavelength range R1 indicates a wavelength range of 430 nm or more and 470 nm or less. In addition, the first light-emitting element 310 is a light-emitting element with a high color temperature. Therefore, the first light-emitting element 310 is suitable as a light-emitting element for activating the user's sympathetic nervous system.

[0059] Furthermore, the second light-emitting element 320 is a light-emitting element with a low color temperature. The peak PK2 of the emission spectrum SP21 of the second white light W2 emitted by the second light-emitting element 320 is lower than the peak PK1 of the first white light W1. The peak PK2 of the second white light W2 is located on the longer wavelength side than the peak PK1 of the first white light W1. The peak PK2 represents the maximum value Vpk2 (global extremum) in the entire wavelength range of the emission spectrum SP21. Specifically, the peak PK2 of the second white light W2 is located in the second wavelength range R2. The second wavelength range R2 represents a wavelength range longer than 470 nm and shorter than 490 nm. Therefore, the emission spectrum SP21 of the second white light W2 is similar to the sunlight spectrum SP. As a result, the second light-emitting element 320 is suitable as a light-emitting element for activating the user's parasympathetic nervous system.

[0060] (First Modification) A lighting device 1 according to a first modified example of this embodiment will be described with reference to Fig. 5. The first modified example differs from the embodiment shown in Fig. 4 mainly in that the maximum point MXb (Fig. 5) on the short wavelength side of the second white light W2 according to the first modified example is lower than the maximum point MXa (Fig. 4) on the short wavelength side of the second white light W2 according to the above embodiment. Below, the differences between the first modified example and the embodiment shown in Fig. 4 will be mainly described.

[0061] FIG. 5 is a diagram showing an emission spectrum SP1 of the first light-emitting element 310 according to the first modification, an emission spectrum SP22 of the second light-emitting element 320, and the sunlight spectrum SP.

[0062] 5, on the shorter wavelength side than the peak PK1 of the first white light W1, the difference DF1 between the maximum point MXb and the first minimum point MN1 of the emission spectrum SP22 of the second white light W2 is smaller than the difference DF2 between the peak PK2 and the second minimum point MN2 of the emission spectrum SP22 of the second white light W2. Therefore, compared to the emission spectrum SP21 (FIG. 4), the emission spectrum SP22 of the second white light W2 can be made more similar to the sunlight spectrum SP. As a result, the color rendering of the second light-emitting element 320 can be further improved.

[0063] Specifically, the local maximum point MXb indicates a local maximum value Vmxb (local maximum value) of the emission spectrum SP2 of the second white light W2 on the shorter wavelength side than the peak PK1 of the first white light W1. The local maximum value Vmxb indicated by the local maximum point MXb is smaller than the maximum value Vpk2 indicated by the peak PK2. Furthermore, the local maximum point MXb indicates the apex of a local convex portion on the shorter wavelength side than the peak PK1 of the first white light W1. Furthermore, in the example of FIG. 5, the local maximum point MXb is located in a third wavelength range R3. The third wavelength range R3 is a wavelength range of 400 nm to 420 nm.

[0064] Furthermore, the first minimum point MN1 of the second white light W2 indicates a minimum value Vmn1 (local minimum value) on the shorter wavelength side than the peak PK1 of the first white light W1 and on the longer wavelength side than the maximum point MXb in the emission spectrum SP22 of the second white light W2. In the example of Fig. 5, the first minimum point MN1 indicates the nearest minimum value Vmn1 (local minimum value) on the longer wavelength side than the maximum point MXb. Furthermore, the first minimum point MN1 indicates the bottom point of a local concave portion on the shorter wavelength side than the peak PK1 of the first white light W1 and on the longer wavelength side than the maximum point MXb.

[0065] Furthermore, the second minimum point MN2 of the second white light W2 indicates a minimum value Vmn2 (local minimum) on the longer wavelength side than the peak PK1 of the first white light W1 and on the longer wavelength side than the peak PK2 of the second white light W2 in the emission spectrum SP22 of the second white light W2. In the example of FIG. 5, the second minimum point MN2 indicates the nearest minimum value Vmn2 (local minimum) on the longer wavelength side than the peak PK2. The minimum value Vmn2 indicated by the second minimum point MN2 is larger than the minimum value Vmn1 indicated by the first minimum point MN1. The minimum value Vmn2 is larger than the maximum value Vmxb indicated by the maximum point MXb. The second minimum point MN2 also indicates the bottom of a local concave portion on the longer wavelength side than the peak PK1 of the first white light W1 and the peak PK2 of the second white light W2.

[0066] (Second Modification) A lighting device 1 according to a second modification of this embodiment will be described with reference to Fig. 6. The second modification differs mainly from the embodiment shown in Fig. 4 in that the second white light W2 according to the second modification does not have a maximum point on the short wavelength side. Below, the differences between the second modification and the embodiment shown in Fig. 4 will be mainly described.

[0067] FIG. 6 is a diagram showing an emission spectrum SP1 of the first light-emitting element 310 according to the second modification, an emission spectrum SP23 of the second light-emitting element 320, and the sunlight spectrum SP.

[0068] As shown in Fig. 6, the emission spectrum SP23 of the second white light W2 does not have a local maximum point (a local maximum value, which is the apex of a local convex portion) on the shorter wavelength side than the peak PK1 of the first white light W1. Therefore, compared to the emission spectrum SP21 (Fig. 4), the emission spectrum SP23 of the second white light W2 can be made more similar to the sunlight spectrum SP. As a result, the color rendering properties of the second light-emitting element 320 can be further improved.

[0069] In the example of FIG. 6, the emission spectrum SP23 of the second white light W2 does not have a maximum point (a local maximum value, which is the apex of a local convex portion) in the third wavelength range R3.

[0070] The embodiments of the present invention have been described above with reference to the drawings. However, the present invention is not limited to the above embodiments and can be implemented in various forms without departing from the spirit of the present invention. Furthermore, the components disclosed in the above embodiments can be modified as appropriate. For example, some of the components shown in one embodiment may be added to the components of another embodiment, or some of the components shown in one embodiment may be deleted from the embodiment.

[0071] Furthermore, the drawings mainly show each component in a schematic manner to facilitate understanding of the invention, and the thickness, length, number, spacing, etc. of each component shown in the drawings may differ from the actual ones due to the convenience of creating the drawings. Furthermore, the configuration of each component shown in the above embodiment is merely an example and is not particularly limited, and it goes without saying that various modifications are possible within a range that does not substantially deviate from the effects of the present invention.

[0072] 3, the maximum emission intensity of the first white light W1 in the wavelength range from approximately 400 nm to approximately 480 nm may be greater than the maximum emission intensity of the second white light W2 in the wavelength range from approximately 400 nm to approximately 480 nm. In addition, the difference between the maximum and minimum emission intensities of the first white light W1 in the wavelength range from approximately 500 nm to approximately 600 nm (specifically, the absolute value of the difference) may be greater than the difference between the maximum and minimum emission intensities of the second white light W2 in the wavelength range from approximately 500 nm to approximately 600 nm (specifically, the absolute value of the difference).

[0073] (2) In the embodiment (including the modified examples) described with reference to FIGS. 4 to 6, the peak PK1 of the first white light W1 may be located near the first wavelength range R1. Furthermore, the peak PK2 of the second white light W2 may be located near the second wavelength range R2. In this case, too, the emission spectrum SP21 to SP23 of the second white light W2 resembles the sunlight spectrum SP. As a result, the second light-emitting element 320 is suitable as a light-emitting element for activating the user's parasympathetic nervous system.

[0074] (3) In the embodiment (including the modified examples) described with reference to FIGS. 4 to 6, the second wavelength range R2 may be a wavelength range around and including 480 nm. In this case, too, the emission spectrum SP21 to SP23 of the second white light W2 is similar to the sunlight spectrum SP. As a result, the second light-emitting element 320 is suitable as a light-emitting element for activating the user's parasympathetic nervous system.

[0075] (4) In the embodiment (including the modified examples) described with reference to FIGS. 4 to 6, the third wavelength range R3 may be a wavelength range around and including 400 nm.

[0076] (5) In the embodiment (including the modified example) described with reference to Figures 3 to 6, the lighting device 1 has two types of light-emitting element groups (first light-emitting element group 31 and second light-emitting element group 32) that emit light of different colors (color temperatures). However, the lighting device 1 may have three or more types of light-emitting element groups that emit light of different colors (color temperatures).

[0077] (6) In the embodiment (including the modified examples) described with reference to FIGS. 3 to 6, there is one light emitting element group having the same light color (color temperature). For example, there is one first light emitting element group 31. However, lighting device 1 may have two or more light emitting element groups having the same light color (color temperature).

[0078] This specification discloses the following notes. (Appendix 1) A first light-emitting element; A second light-emitting element; a light-emitting control unit that individually controls a light-emitting state of the first light-emitting element and a light-emitting state of the second light-emitting element; Equipped with the first light-emitting element emits first white light, and a peak of an emission spectrum of the first white light is in a first wavelength range of 430 nm or more and 470 nm or less, or in the vicinity of the first wavelength range; the second light-emitting element emits second white light, and a peak of an emission spectrum of the second white light is present in a second wavelength range longer than 470 nm and shorter than 490 nm, or in the vicinity of the second wavelength range; A lighting device, wherein the peak of the second white light is located on the longer wavelength side than the peak of the first white light and is lower than the peak of the first white light.

[0079] (Appendix 2) The emission spectrum of the second white light does not have a maximum point on the shorter wavelength side than the peak of the first white light, or a difference between the maximum point and the first minimum point of the second white light on a shorter wavelength side than the peak of the first white light is smaller than a difference between the peak and the second minimum point of the second white light; the first minimum point of the second white light indicates a minimum value on a longer wavelength side than the maximum point in the emission spectrum of the second white light, 2. The lighting device according to claim 1, wherein the second minimum point of the second white light indicates a minimum value on a longer wavelength side than the peak of the second white light in an emission spectrum of the second white light. [Industrial Applicability]

[0080] The present invention provides a lighting fixture and has industrial applicability. [Explanation of symbols]

[0081] 1. Lighting equipment 2 Light Emission Control Unit 310 First light-emitting element 320 second light-emitting element

Claims

1. a first light-emitting element that emits first white light; a second light-emitting element that emits second white light; a light-emitting control unit that individually controls a light-emitting state of the first light-emitting element and a light-emitting state of the second light-emitting element; Equipped with a maximum emission intensity in a wavelength range of 400 nm or more and 480 nm or less in an emission spectrum of the first white light is greater than a maximum emission intensity in a wavelength range of 400 nm or more and 480 nm or less in an emission spectrum of the second white light, a difference between a maximum emission intensity and a minimum emission intensity in a wavelength range of 500 nm or more and 600 nm or less in the emission spectrum of the first white light is larger than a difference between a maximum emission intensity and a minimum emission intensity in a wavelength range of 500 nm or more and 600 nm or less in the emission spectrum of the second white light, a peak showing a maximum value in the entire wavelength range of the emission spectrum of the first white light exists in a wavelength range of 430 nm or more and 470 nm or less, a peak indicating a maximum value in the entire wavelength range of the emission spectrum of the second white light is lower than a peak indicating a maximum value in the entire wavelength range of the emission spectrum of the first white light, and is present in a wavelength range longer than 470 nm and shorter than 490 nm; Lighting fixtures.

2. The lighting device according to claim 1 , wherein the color rendering properties of the second light-emitting element are higher than the color rendering properties of the first light-emitting element.

3. 3. The lighting device according to claim 1, wherein the light-emitting control unit controls the light-emitting state of the first light-emitting element and the light-emitting state of the second light-emitting element individually depending on the time of day in accordance with a schedule set in the light-emitting control unit.

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