JP5251088B2 - Lighting device - Google Patents

Description

  The present invention relates to an illuminating device that is improved in arousal level and color rendering.

  As an example of a conventional lighting device, a device for the purpose of mainly improving comfort, workability, etc. depending on the lighting environment has been proposed. For example, there has been proposed an illumination device that relaxes the observer by changing the light quantity of the illumination light periodically to make it easier for the observer to adjust the breathing rhythm in accordance with the change in the light quantity of the illumination light. (For example, refer to Patent Document 1).

  In the office lighting environment, there is a lighting device called a circadian lighting system that changes the brightness according to the time of day, lunch break, etc., and the desk is used at the start of work in the morning or at the start of work after the lunch break. By irradiating light with a high illuminance of 2500 lx on the upper surface, the awakening level of the worker is improved, and concentration is enhanced or sleepiness is prevented (see, for example, Non-Patent Document 1).

Furthermore, in the light emitting device, red, green, and blue LEDs are used to illuminate in white, and two types of blue LEDs having different peak wavelengths are used as blue, one of which secretes melatonin, a hormone that induces sleep. There is a blue LED that emits a lot of light having a peak wavelength that suppresses light emission, and a blue LED that emits light having a peak wavelength that has an effect of suppressing the secretion of melatonin. And when the red, green, or blue LED is turned on, it contains a lot of light at the peak wavelength that suppresses the secretion of melatonin. (For example, refer to Patent Document 2).
JP 2002-237391 A Japanese Patent Laid-Open No. 2005-63687 URL: http: // www. mew. co. jp / tecrepo / 531j / main02. html # 005

  However, in the above prior art, in order to improve the arousal level, in order to realize light irradiation with high illuminance of desk top illuminance of 2500 lx, very large lighting energy is required, which is difficult to realize in an actual office or the like. In addition, the brightness of the desk top surface illumination of 2500 lx may cause stress on the eyes depending on the reflectance of the desk top surface, and there is a problem that eye fatigue is likely to occur.

  In addition, by using blue LEDs that emit a lot of light with a peak wavelength that suppresses secretion of melatonin, a hormone that induces sleep, for red and green LEDs, Although the melatonin secretion inhibitory effect is given and it brings about the arousal effect, there is a possibility that sufficient improvement of the arousal level may not be obtained only by suppressing the induction of sleep.

  Furthermore, although the subject that color reproducibility falls is shown, color rendering property is not considered at all.

  The present invention has been made in view of these points, and an object of the present invention is to provide an illuminating device that can improve the arousal level without requiring excessive lighting energy or causing eye fatigue.

  The illumination device according to claim 1 is a main light source that mainly emits white light; a single-wavelength light source that emits single-wavelength light that has a peak in the wavelength range of 400 to 700 nm and provides a wakefulness level; A lighting circuit for turning on the light source; detection means for detecting the amount of light emitted from the main light source and the single-wavelength light source, the amount of light that provides a wakefulness level; and the detection value from the detection means is converted into a wakefulness, Control means for controlling the light output of the single wavelength light source so that the arousal level detection value becomes the arousal level target value.

  In the first and subsequent claims, for example, a fluorescent lamp, an HID lamp, an incandescent lamp, a light emitting diode, etc. are used as the main light source that mainly emits white light. If white light is mainly used, light of a color other than white is emitted. It may be included. The single wavelength light source is, for example, a light emitting diode or a wavelength-controllable HID lamp, and emits single wavelength light having a peak wavelength of 400 nm to 700 nm, preferably 400 nm to 500 nm, more preferably 420 nm to 480 nm. is there. As the single wavelength light, for example, single wavelength light of each color system such as blue, green, and red may be used, but blue single wavelength light is preferable in order to improve the arousal level.

The arousal level can be defined by, for example, an α wave bandwidth ratio (α / α + β) obtained by a ratio of α wave power α (μV ² ) of a human brain wave and β wave power β (μV ² ). The light from which the awakening level is obtained means light in which the α wave bandwidth after irradiation is smaller than the α wave bandwidth after irradiation. Alternatively, the light that provides the awakening level may be defined as single-wavelength light whose AAC (α wave attenuation rate) after irradiation is larger than that before irradiation. Here, AAC is defined by {(α wave power α (μV ² ) when closed) / (α wave power α (μV ² ) when opened)}.

  The above definition applies not only to the light of the main light source but also to the single wavelength light.

  The light that provides such a level of awakening is particularly noticeable for single-wavelength light having a peak at a wavelength of 400 to 500 nm. The horizontal axis represents the wavelength (λ) of the single-wavelength light source that irradiates the object, and the vertical axis represents For example, it has been clarified that a bell-shaped sensitivity curve having a peak in the wavelength range of 400 to 500 nm is obtained when an index indicating an arousal level such as an α wave band ratio is used. This sensitivity curve is referred to as the arousal level improvement sensitivity curve, and the degree of influence on the human arousal level for each wavelength is referred to as the arousal level improvement sensitivity A (λ).

  The arousal level improvement sensitivity A (λ) is a function of the wavelength (λ), but its value is an arbitrary unit and can be appropriately normalized so that it can be easily calculated.

  In addition, the arousal level is multiplied by the radiation amount X (λ) for each wavelength of light and the arousal level improvement sensitivity A (λ) (wake level improvement sensitivity curve) indicating the degree of influence on the level of human arousal for each wavelength. The integrated value (A) obtained by integrating the product obtained in this manner in a predetermined wavelength region.

  The awakening level target value may be a value of the awakening level A obtained in the same manner as the above calculation, or may be an illuminance target value of light emitted from the main light source.

  In other words, when the awakening level target value is set as the illuminance target value, it is assumed that the light output of the main light source is increased so as to achieve a predetermined illuminance target value. It is possible to calculate the amount of radiation of light from which a level can be obtained and set it as the arousal target value.

  The illuminating device according to claim 2 is characterized in that the detection means includes an illuminance sensor and a filter having a spectral sensitivity curve having a peak in a wavelength range of 400 to 500 nm, which is disposed on the light receiving surface of the illuminance sensor. And

  The illuminating device according to claim 3, wherein the detection means includes an illuminance sensor that detects an amount of light emitted from the main light source and the single wavelength light source, a detection value of the illuminance sensor, a spectral distribution of the main light source and the single wavelength light source, And an arithmetic unit that calculates an amount of light radiation from which the arousal level is obtained from the arousal level improvement sensitivity curve.

According to a fourth aspect of the present invention, there is provided a lighting device including a control unit that controls the lighting circuit so as to repeatedly change the intensity of the single wavelength light source.

  The change in intensity of the single wavelength light source may be blinking or strong. Further, the repetition of the intensity change may be regular or irregular.

  The present inventors conducted an experiment in which a single wavelength light (458 nm, 550 m, 670 nm) was exposed in a dark place, and measured the physiological reaction of the subject at that time. At that time, the α wave band ratio showed the largest change immediately after exposure to single-wavelength light, and the increased wakefulness level maintained the effect for, for example, 8 minutes, and then tended to decay over time. From this measurement result, it was shown that the arousal level is maintained by changing the intensity of single wavelength light and repeating the change. The physiological responses measured in this experiment are α wave bandwidth, AAC (α wave attenuation rate), LF / HF, LF / HF + LF, heart rate variability such as RR interval, systolic blood pressure, diastolic blood pressure, average Blood pressure, heart rate, cardiac output, stroke volume, peripheral vascular resistance, pupil diameter, body temperature.

The lighting device according to claim 5 is dimmed so that the mixed intensity of the single-wavelength light and the main light source light has a constant radiation intensity ratio between the single-wavelength light and the main light source light when the average color rendering index is 80 or more. The light control means which comprises is equipped.

  According to the illumination device of the first aspect, it is possible to obtain a desired arousal level by adding single-wavelength light capable of obtaining the arousal level to the light from the main light source.

  Moreover, since the single wavelength light source is a low power light source, it is possible to obtain an arousal level with energy saving.

  Furthermore, unlike the conventional example, the arousal level is not obtained by increasing the light output of the main light source, so that further energy saving can be achieved and eye fatigue can be prevented or reduced.

  According to the illuminating device of claim 2, by disposing a filter having a spectral sensitivity curve having a peak in the wavelength range of 400 to 500 nm on the light receiving surface of the illuminance sensor, the wavelength range included in the spectral sensitivity curve is set. The amount of emitted light can be easily detected, and the arousal level can be easily obtained. In addition, the arousal level can be obtained with an illuminance sensor.

According to the illuminating device of claim 4 , in addition to the effect of the illuminating device according to any one of claims 1 to 3, the arousal level can be maintained by repeatedly changing the intensity of the single wavelength light source.

According to the illuminating device of the fifth aspect , in addition to the effect of the illuminating device according to the fourth aspect, the dimming is performed so that the radiation intensity ratio between the single wavelength light and the main light source light is constant. As a result, the average color rendering index (Ra) can always be maintained at a high color rendering property of 80 or more.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same or an equivalent part in several drawings.

  1 to 4 show a lighting device according to a first embodiment of the present invention, FIG. 1 is a front view of a light source surface of the lighting device, FIG. 2 is a side view of the lighting device, and FIG. 3 is the lighting device. FIG. 4 is a waveform diagram showing the intensity change of single-wavelength light with time, and FIG. 5 is the type of white light and the presence / absence of single-wavelength light. It is explanatory drawing which shows a change with a wave bandwidth ratio ((alpha) / (alpha) + (beta)).

  FIG. 2 shows a side view of a work lighting device 1 such as a desk lamp which is an example of the lighting device according to the first embodiment of the present invention. The work lighting device 1 serves as a device main body 1a. 2, a movable arm 3 disposed on the main body 2, and a lamp body 4 attached to the tip of the arm 3.

  The lamp body 4 has a light source surface 5 formed on one surface (the lower surface in FIG. 2), and a reflection surface 6 is formed on the light source surface 5 as shown in FIG. In addition, the lamp unit 4 is provided with a main light source 7 which is mainly a white light and irradiates mainly white light, and a single-wavelength light source 8 facing the reflecting surface 6.

  The main light source 7 is composed of, for example, a straight tube fluorescent lamp, and three of the main light sources 7 are arranged in parallel at a predetermined interval in the width direction (radial direction). .. Are arranged in the longitudinal direction of the main light source 7 at equal intervals.

The single-wavelength light source 8 is an arousal level defined by an α wave bandwidth ratio (α / α + β) determined by a ratio of α wave power α (μV ² ) of human brain waves and β wave power β (μV ² ). The light emitting diode element etc. which irradiate the single wavelength light from which are obtained.

  The single-wavelength light is a single-wavelength light that provides an awakening level defined by an α wave bandwidth ratio (α / α + β) obtained by a ratio of α wave power α of human brain waves and β wave power β. Yes, the subject's brain wave α wave power α and β wave power β when the subject is irradiated with single wavelength light together with white light, and the α wave bandwidth ratio (α / α + β) is obtained, and this α-wave bandwidth ratio refers to single-wavelength light that is smaller than 1, for example. In addition, single-wavelength light is defined as single-wavelength light, for example, having a wavelength width (half-value width) of 50 nm or less at a half value of the wavelength peak value.

  As the single wavelength light, for example, a blue system having a wavelength of 470 nm, a green system having a wavelength of 550 nm, a red system having a wavelength of 670 nm, and other color systems can be used. Single wavelength light in a wavelength region of 500 nm, preferably 420 to 500 nm, more preferably 420 to 480 nm is preferable.

  The intensity of the single wavelength light is preferably smaller than the intensity of the white light of the main light source 7 and does not interfere with the work under normal white light illumination, and is preferably about 1 lx, for example.

The maximum output of single wavelength light has an average color rendering index (Ra) of 80 as a limit value. For example, when a Toshiba mellow line FHF32EX-D-H is used as the main light source 7, and a light source such as an LED (light emitting diode) that outputs single wavelength light having a peak wavelength of 458nm and a full width at half maximum of 10nm is used as the single wavelength light source 8. The output of single-wavelength light with respect to 750 lx light emitted from the main light source 7 is set to about 76 μW / cm ² or less. Even in a case other than this combination of light sources, the limit value of the maximum output of single wavelength light is set to a value at which Ra is 80 or more when mixed with the main light source light.

FIG. 4 shows a single wavelength with a peak wavelength of 458 nm and a full width of 10 nm on a white paper illuminated with a white light of 750 lx of Toshiba Mellow Line FHF32EX-D-H having an average color rendering index (Ra) of 80 used as the main light source 7, for example. The relative value of the irradiance [μW / cm ² ] of single wavelength light calculated based on the spectral reflectance when light is added, and the irradiance of this single wavelength light and the average color rendering index (Ra) value The relationship is shown by the characteristic curve A. According to the characteristic curve A in FIG. 4, the average color rendering index (Ra) is set to about 80 to 86 by setting the irradiance of single wavelength light to about 76 [μW / cm ² ] or less. Can do.

  In the case of this characteristic curve A, Ra is improved when single-wavelength light is added, and Ra is lowered when a certain peak is exceeded. Furthermore, when single wavelength light is added, Ra becomes 80 or less, color reproducibility of the visual environment is deteriorated, and a sense of incongruity occurs. This characteristic curve A is an example. Similarly, in the combination of other main light sources and single-wavelength light sources, Ra is reduced when single-wavelength light is added to the main light source beyond a certain level. It is done. In addition, there is a combination in which Ra does not improve even when single-wavelength light is added and immediately decreases, but in this case, Ra of the main light source needs to be 80 or more. Since the average color rendering index Ra can be calculated if the spectral distribution of the light source is divided, the spectral distribution and adjustment of the single-wavelength light source 8 are adjusted to Ra80 or higher according to the spectral distribution and radiation amount of the main light source. What is necessary is just to set a luminous intensity.

  As shown in FIG. 3, the work lighting device 1 includes a control unit 10 that controls a lighting circuit 9 such as an inverter that controls lighting of the main light source 7 and the single wavelength light source 8. The control unit 10 is composed of, for example, a microprocessor, turns on the single wavelength light source 8 when the main light source 7 is turned on, and emits a single wavelength irradiated by the single wavelength light source 8 as shown by a waveform B in FIG. The light intensity is controlled to be changed periodically or irregularly. For example, the single-wavelength light source 8 is repeatedly blinked, and the lighting time is set longer than the extinguishing time. Further, when the main light source 7 and the single wavelength light source 8 are dimmed, the control unit 10 performs dimming control so that the intensity ratio between the light sources 7 and 8 is kept constant.

  Next, the operation of the lighting device 1 according to the first embodiment will be described.

  First, in order to verify the usefulness of single-wavelength light, we examined the physiological responses of subjects when they were exposed to single-wavelength light of multiple wavelengths under normal white light illumination, and we took statistics. .

As shown in FIG. 6, in this test, the subject was irradiated with 750 lx daylight color C, 750 lx daylight white E, 750 lx daylight color + (addition) 1 lx blue single wavelength light D, and each irradiation state Measure the α wave power generated in the relaxed state and the β wave power generated in the tension state of the subject's brain waves, and the α wave bandwidth ratio (by the ratio of the measured α wave power and β wave power ( α power (μV ² ) / α power (μV ² ) + β power (μV ² )) was determined, and the arousal level of the subject was verified based on the α wave band ratio.

As a result, as shown in FIG. 6, in the case of daylight color C of 750 lx and daylight white E of 750 lx, α wave bandwidth ratio (α power (μV ² ) / α power (μV ² ) + β power (μV ² )) Is about 1.00, whereas in the case of 750 lx daylight color + 1 lx blue single-wavelength light D, the α wave bandwidth ratio (α power (μV ² ) / α power (μV ² ) The power of + β (μV ² ) was reduced to about 0.90. The smaller the value of the α wave bandwidth ratio (α power (μV ² ) / α power (μV ² ) + β power (μV ² )), the higher the wakefulness level. Therefore, in the case of 750 lx daylight color + 1 lx blue single-wavelength light E, the tendency of the subject's arousal level to improve was shown.

  When the wavelength of the single wavelength light was also measured, the single wave light having a peak at 420 to 480 nm showed a tendency that the α wave bandwidth ratio was smaller and the arousal level was further improved.

  In addition, the α wave bandwidth ratio of the test subject changed most greatly immediately after exposure to single wavelength light and became a small value, and the state of the value was tended to continue for a predetermined time.

  Therefore, when the intensity of single-wavelength light was repeatedly changed, such as temporarily suspending exposure to single-wavelength light and re-exposure, the alpha wave bandwidth ratio did not attenuate or increase, and the state of improved arousal level continued. The tendency to do was shown.

From these results, under normal white light illumination, the α wave bandwidth ratio (α power (μV ² ) / α power determined by the ratio of α wave power α to β wave power β is obtained. It is shown that the arousal level is improved by exposing the single wavelength light that can obtain the arousal level defined by the power of (μV ² ) + β (μV ² )). In particular, the blue single wavelength light is used. Thus, it has been shown that the arousal level can be further improved, and that the state of a high arousal level can be continued by repeatedly changing the intensity of the single wavelength light.

  Therefore, in the work lighting device 1, the worker's arousal level can be improved and concentration power can be improved only by adding single-wavelength light that does not interfere with the single-wavelength light to work under normal white light illumination. As a result, the working efficiency can be improved and the lighting energy can be easily realized without excessive light and eye fatigue does not occur as compared with the case of conventional high-illumination light irradiation.

Further, it is defined by an α wave bandwidth ratio (α power (μV ² ) / α power (μV ² ) + β power (μV ² )) obtained by the ratio of α wave power to β wave power. Because it uses single-wavelength light that provides a level of wakefulness, the blue light that is defined based on the melatonin secretion-inhibiting effect is used as in the past, and the level of wakefulness is ensured compared to the case of only suppressing the induction of sleep. Can be improved.

  In addition, by adding the single wavelength light source 8 to the working illumination device 1 such as a desk lamp disposed near the worker, the single wavelength light is not easily attenuated, and the arousal level is improved more effectively. And requires less lighting energy. In this case, the distance between the single-wavelength light source 8 and the desk surface is relatively short, but the single-wavelength light emitted from the single-wavelength light sources 8, 8,... Because they are mixed, single-wavelength light does not stand out.

  And in this working illuminating device 1, since the average color rendering index (Ra) of the mixed color of main light source light and single wavelength light is 80 or more, color rendering can also be improved. When the main light source 7 and the single wavelength light source 8 are dimmed, the control unit 10 performs dimming so that the radiation intensity ratio between the main light source 7 and the single wavelength light source 8 is constant. Since the radiation intensity ratio between the light source light and the single wavelength light is not changed, the average color rendering index (Ra) can be kept substantially constant at 80 or more even if the radiation intensity of the work lighting device 11 as a whole changes. .

  The single-wavelength light sources 8, 8,... Can be arranged near the main light source 7 to improve the arousal level by exposing the single-wavelength light without making the operator much conscious. In this case, for example, if the single-wavelength light sources 8, 8,... Can be improved.

  Further, as the lighting device including the main light source 7 and the single-wavelength light sources 8, 8,..., For example, it can be applied to a lighting device installed on the ceiling surface of an office or school, and a lighting environment with high work efficiency. Can provide.

  FIG. 7 is an explanatory diagram of a road lighting system 20 according to the second embodiment of the present invention. In this road lighting system 20, for example, a plurality of lighting devices 22, 22,... That illuminate a road surface 21 of a road such as an expressway are installed at predetermined intervals along the longitudinal direction of the road. Each illuminating device 22 irradiates a first wavelength illuminating device 22a including, for example, an HID lamp that mainly emits white light, and a main light source such as an HID lamp that mainly illuminates white light and single wavelength light. A second illuminating device 22b having a single wavelength light source such as a light-emitting diode or a wavelength-controllable HID lamp. For example, a plurality of (for example, three) first illuminating devices 22a along the road The second lighting devices 22b are alternately installed.

  Therefore, when the car 23 driven by the driver travels on this road, the single wavelength light is exposed to the driver of the car 23 at a predetermined interval. Therefore, the driver's arousal level is improved and maintained, drowsiness is eliminated, concentration is enhanced, and it is possible to contribute to accident prevention.

  Further, the present invention can be similarly applied to a tunnel lighting device installed in a tunnel.

  In the above embodiment, the case where the single wavelength light source used for the lighting devices 1 and 20 is irradiated with only one type of single wavelength light has been described. However, the present invention is not limited to this, and a plurality of types of single wavelength light sources are used. You may comprise so that single wavelength light may be combined and irradiated.

  FIG. 8 is a block diagram showing a configuration of an illumination device 30 according to the third embodiment of the present invention, FIG. 9 is a schematic diagram of the main part thereof, and FIG. 10 is a sensitivity curve characteristic showing a relative luminous sensitivity curve A and a spectral sensitivity curve B. FIG.

  The illuminating device 30 mainly irradiates white light that is substantially the same as the main light source 7 shown in FIG. Awake sensor 32, a single wavelength light source 33 using a blue light diode (peak wavelength: 460 nm, full width at half maximum: 30 nm) substantially the same as the single wavelength light source 8 shown in FIG. 1 and the like, and a setting device 34 for manually inputting the arousal level And a control unit 35 including a nonvolatile memory and a microprocessor.

  As shown in FIG. 9, the main light source 31 is disposed in a main light source lighting device 37 installed at a required location such as the ceiling 36, and the irradiated surface 38 such as a desk surface of a person P work desk and its surroundings. Illuminate.

  The single-wavelength light source 33 is disposed in the single-wavelength light source lighting fixture 39 together with its lighting circuit (not shown) and the like. The single-wavelength light source illumination fixture 39 is installed on the irradiated surface 38 together with the arousal sensor 32, for example. The single wavelength light source lighting fixture 39 directly irradiates the person P with single wavelength light, for example.

  As shown in FIG. 10, the single wavelength light source 33 is a light emitting diode element or the like that emits single wavelength light that obtains an arousal level included in the sensitivity curve B having a peak wavelength in the wavelength range of 400 to 500 nm. This is the same as the single wavelength light source 8 shown in FIG.

  That is, for the single wavelength light, for example, a blue system having a wavelength of 470 nm, a green system having a wavelength of 550 nm, a red system having a wavelength of 670 nm, and the other color systems can be used. For example, single wavelength light having a peak in the wavelength region of 400 to 500 nm, preferably 420 to 500 nm, more preferably 420 to 480 nm is preferable.

  The awakening sensor 32 is configured by providing a blue light filter on the outer surface of the light receiving surface of the illuminance sensor. The blue light filter has a spectral sensitivity curve B corresponding to the arousal level enhancement sensitivity curve C having a peak at 460 nm, for example, as shown in FIG. For this reason, the awakening sensor 32 can detect the radiation amount of the light component included in the sensitivity curve B (see FIG. 10) having a peak in the wavelength range of 400 to 500 nm during light reception received from the main light source 31. .

  That is, it is possible to detect the radiation amount of the light component (radiation amount of light having a wakefulness level) included in the wakefulness enhancement sensitivity curve C by the wakefulness sensor 32.

  And the control part 35 takes in the radiation amount detection value of the light contained in the alertness improvement sensitivity curve C detected by the alertness sensor 32 as an alertness level.

  Then, the control unit 35 compares the calculated wakefulness level with the wakefulness setting value (target value) read from the setting device 34, and obtains the difference between the two wakefulness levels. Further, the optical output of the single wavelength light source 33 for eliminating the difference, that is, zeroing is calculated, and the optical output of the single wavelength light source 33 is controlled. At this time, only the arousal level can be improved without increasing the light output of the main light source 7.

  Next, the effect | action of this illuminating device 30 is demonstrated.

  The light from the main light source 31 is received by the wake-up sensor 32, and here, the amount of light emitted to obtain the wake-up level during the light reception is detected. This radiation amount detection value is read by the control unit 35 and converted into the arousal level.

  The control unit 35 compares the arousal level detection value with the arousal level target value (set value) read from the setting device 34, detects the difference between the two, and sets the difference to zero so that the single wavelength light source 33 is set. To control the light output.

  Therefore, according to the illumination device 30, the single-wavelength light that can be obtained from the single-wavelength light source 33 is added to the main light source light, so that the awakening level can be improved. Further, the awakening level of the visual environment of the person P illuminated by the main light source 31 can be arbitrarily controlled by the setting device 34.

  Furthermore, since the single-wavelength light source 33 can be configured by a blue light emitting diode (LED) with low power consumption, energy saving can be achieved compared to the conventional example in which the awakening effect is improved by increasing the light output of the main light source 31. it can.

For example, when the wakefulness level that is the same as the wakefulness level obtained when the luminous flux of the main light source 31 is only 2500 lx is to be achieved by adding LED blue light to the main light of the 750 lx main light source 31 as in the present invention. The awakening level when the main light source 31 is 2500 lx is 2.90, and when the main light source 31 is 750 lx, the awakening level is 0.87. At this time, the radiation amount of LED blue light is 2.19 W / m ² , the radiation amount of 2500 lx of the main light source 31 is 8.34 W / m ² , and the radiation amount of 750 lx is 2.50 W / m ² . Therefore, this illuminating device 30 can improve the arousal level with energy saving of about 45% compared to the luminous flux 2500 lx of the main light source 31. However, if LED blue light is simply added to the 750 lx main light source 31 at this time, the color rendering property deteriorates. Therefore, in order to obtain a wakefulness level equivalent to 2500 lx, the single wavelength light source 33 is used as shown in FIG. It is desirable to install in a different location. That is, by directly irradiating the LED blue light to the eyes of the person P, the arousal level is increased, while the irradiated surface 38 is not irradiated with the LED blue light. A decrease in color rendering can be prevented or suppressed.

  Moreover, according to this illuminating device 30, since the awakening sensor 32 was comprised by arrange | positioning the blue filter in the light-receiving surface of an illumination intensity sensor, arousal level can be obtained easily.

  On the other hand, the control unit 35 detects the illuminance value of the light source by the illuminance sensor instead of reading the radiation amount of light included in the wakefulness enhancement sensitivity curve C from the wakefulness sensor 32, and stores the spectral distribution and illuminance of the light source stored in advance. Multiplying the light emission amount X (λ) determined by the illuminance value detected by the sensor and the arousal enhancement sensitivity A (λ), and integrating the product in a predetermined wavelength region (for example, a visible light region of 380 to 780 nm). Thus, the arousal level A can be obtained.

An example of a formula for calculating the arousal level (A (λ)) is shown in the following formula (1).

  Further, the illumination device 30 may also be configured such that the light output of the single wavelength light source 33 is periodically varied with a predetermined width around the awakening target value as in the illumination device 1 shown in FIG. Good. According to this, the awakening level can be maintained as in the lighting device 1 shown in FIG.

  Further, the spectral distribution of the light source may be specified using a spectral irradiance sensor. According to this, since the spectral distribution of the main light source light can be directly detected, the arousal level conversion in the control unit 35 can be performed easily and quickly.

  In the setting device 34, the case where the wakefulness level is directly input has been described. However, since the wakefulness level can be calculated from the illuminance value and the spectral distribution of the light source, the target illuminance value is input instead of the wakefulness level. You may comprise so that a single wavelength light source may be controlled so that the arousal level corresponding to a value may be obtained. In this case, for example, the control unit 35 has a data table in which the light source identification information such as the model numbers of the plurality of main light sources 31 and the spectral distribution thereof are associated with each other. When the identification information is input together with the target illuminance value, the illuminance value may be converted into the arousal level with reference to the data table.

  FIG. 12 is a block diagram showing a configuration of a lighting apparatus 40 according to the fourth embodiment of the present invention.

  The illuminating device 40 mainly emits the same white light as the main light source 7 shown in FIG. 1 or the like, for example, a main light source 41 such as a fluorescent lamp, a single wavelength light source 43, the main light source 41 and the single wavelength light source 43. An illuminance sensor 42 for detecting the illuminance of the light source, a setting device 44 for setting the target illuminance and the target average color rendering index, a lighting circuit 45 for lighting the main light source 41 and the single wavelength light source 43, and a lighting circuit 44 for the main light source 41. In addition, the control unit 46 includes a calculation unit 46 a that converts the detection value of the illuminance sensor 42 into the arousal level, and a storage unit 46 b that stores the spectral distribution of the main light source 41 and the single wavelength light source 43.

  Hereinafter, the effect | action which concerns on the illuminating device 40 of this embodiment is demonstrated.

  First, the user inputs the target illuminance and the target average color rendering index by the setting device 44, and turns on the main light source 41 by control means such as a switch or a remote controller (not shown). At this time, the light output of the main light source 41 can be appropriately set and changed according to the situation.

  The illuminance sensor 42 detects the light emitted from the main light source 41 and transmits the detected value to the control unit, and the calculation unit 46b receives the spectral distribution of the main light source 41 stored in the storage unit 46a and the received illuminance. The current arousal level A is obtained from the value by the above-described equation (1). In the present embodiment, the same wakefulness enhancement sensitivity curve as in FIG. 11 is used.

  Next, the awakening level A when it is assumed that the light output is controlled so that the main light source 41 has the target illuminance is obtained.

  Then, the control unit 46 controls the light output of the single-wavelength light source 43 by controlling the lighting circuit 45 so that the current awakening level A becomes the awakening level A as assumed.

  However, when single wavelength light is added as described above, an effect of improving the arousal level can be obtained, but it is conceivable that the color rendering property of the object illuminated by the light source is lowered.

  In particular, when the average color rendering index falls below 80, the color appearance may become unnatural.

  Therefore, it is necessary to limit the average color rendering index of the light mixed with the main light source 41 and the single wavelength light source 43 so as not to become a predetermined value or less.

  Hereinafter, a procedure in which the control unit 46 controls the main light source 41 and the single wavelength light source 43 so that the average color rendering index is 80 or more, for example, will be described.

  First, as described above, the illuminance sensor 42 that turns on the main light source 46 detects the illuminance of the main light source 41 and transmits the detected value to the control unit.

  At this time, when the control unit 46 adds the single wavelength light source 43 from the spectral distribution or average color rendering index of the main light source 41 and the single wavelength light source 43 stored in advance in the storage unit 46b and the detection value of the illuminance sensor 42. The average color rendering index is calculated.

  Then, the light output range of the single wavelength light source 43 is calculated such that light mixed with the main light source 41 and the single wavelength light source 43 has an average color rendering index of 80 or more.

  When the light output of the single wavelength light source is controlled so as to improve the arousal level, if the light output range of the single wavelength light source 43 calculated above is exceeded, the light of the single wavelength light source is further increased. Stop the control to be added.

  That is, if the light output of the single wavelength light source to be added is within the above range, the average color rendering index will not be less than 80.

  In the present embodiment, the case where the average color rendering index is 80 or more has been described. However, it may be 85 or more and 90 or more, and may be configured so that the user can set as appropriate.

  In addition, although it has been described that the spectral distributions of the main light source 41 and the single wavelength light source 43 are stored in advance, a spectral irradiance sensor capable of detecting the spectral distribution of the light source may be used.

The front view of the light source surface of the lamp | ramp part of the illuminating device which concerns on the 1st Embodiment of this invention. The side view of the illumination device. The figure which shows the structure of the illumination device. The graph which shows the relative relationship between the irradiance of the single wavelength light of the said illuminating device, and an average color rendering evaluation numerical value. Explanatory drawing which shows the intensity | strength change of the single wavelength light with respect to time passage of the illumination device. Explanatory drawing which shows the change of the kind of white light of the said illuminating device, the presence or absence of single wavelength light, and alpha wave band ratio ((alpha) / (alpha) + (beta)). Explanatory drawing of the road lighting system using the illuminating device which shows the 2nd Embodiment of this invention. The block diagram which shows the structure of the illuminating device which concerns on the 3rd Embodiment of this invention. The principal part schematic diagram of the illuminating device shown in FIG. The graph which shows the characteristic when the peak value is set to 1 for both the specific visibility curve and the spectral sensitivity curve. The graph which shows a wakefulness improvement sensitivity curve. The block diagram which shows the structure of the illuminating device which concerns on the 4th Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Work illuminating device as an illuminating device, 1a ... Apparatus main body, 7, 31, 41 ... Main light source, 8, 33, 43 ... Single wavelength light source, 9 ... Lighting circuit, 10 ... Control part, 22b ... Illumination Second lighting device as device, 30, 40 ... lighting device, 32 ... wake sensor, 34, 44 ... setter, 35, 46 ... control unit, 45 ... lighting circuit.

Claims (5)

A main light source that mainly emits white light;
A single-wavelength light source that emits single-wavelength light that has a peak in the wavelength range of 400 to 700 nm and provides a level of arousal;
A lighting circuit for lighting a single wavelength light source;
Detection means for detecting the amount of light emitted from the main light source and the single-wavelength light source that can provide an arousal level;
A control means for converting the detection value from the detection means into a wakefulness level and controlling the light output of the single wavelength light source so that the wakefulness detection value becomes a wakefulness target value;
An illumination device comprising: 2. The illumination device according to claim 1, wherein the detection means includes an illuminance sensor and a filter disposed on a light receiving surface of the illuminance sensor and having a spectral sensitivity curve having a peak in a wavelength range of 400 to 500 nm. . The detection means includes an illuminance sensor that detects the amount of light emitted from the main light source and the single wavelength light source, a detection value of the illuminance sensor, a spectral distribution of the main light source and the single wavelength light source, and an arousal level sensitivity curve. The lighting device according to claim 1, further comprising a calculation unit that calculates a radiation amount of light to be obtained. 4. The illumination device according to claim 1, further comprising a control unit that controls the lighting circuit so as to repeatedly change the intensity of the single wavelength light source. Dimming means is provided for dimming so that the mixed light of the single wavelength light and the main light source light has an average color rendering index of 80 or more and the radiation intensity ratio between the single wavelength light and the main light source light is constant. The lighting device according to claim 4 .

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