JP6001277B2 - Lighting device - Google Patents

Description

  The present invention relates to a lighting device used for lighting in a living room.

  Conventional illumination devices are disclosed in Patent Documents 1 and 2. The illumination device of Patent Document 1 illuminates the water in the bathtub by changing the light color in a preset change pattern. Thereby, the feeling of relaxation at the time of bathing can be heightened.

  Moreover, the illuminating device of patent document 2 illuminates by changing illumination intensity according to the light quantity of sunlight. Thereby, it is possible to adjust the biological rhythm and to easily maintain the arousal level.

JP 2008-53183 A JP 09-306672 A

  In recent years, for many people who have various stresses, it is required to further improve the feeling of relaxation and comfort. Further, the conventional lighting device has a problem that the fatigue level cannot be reduced when the user performs a predetermined work, and the fatigue level is large.

  An object of this invention is to provide the illuminating device which can improve a feeling of comfort and can reduce the fatigue degree at the time of work.

  In order to achieve the above object, according to the present invention, in an illumination device that emits illumination light by light emission of an LED element, the area of 600 nm to 700 nm is 30 nm with respect to the area of 400 nm to 800 nm of the spectrum of illumination light. % To 70%, the area from 400 nm to 500 nm is 20% or less, and the spectrum of the illumination light has a maximum value between 600 nm and 700 nm, and the spectrum of the spectrum from 500 nm to 600 nm with respect to the maximum value. The maximum value is 70% or less.

  According to this configuration, illumination is performed by emitting illumination light having the above spectrum by light emission of the LED element. This improves the user's comfort and relaxed feelings during breaks and gatherings, and reduces the user's feeling of fatigue during work such as work or housework.

  According to the present invention, in the illumination device having the above-described configuration, the area from 500 nm to 600 nm is 15% to 45% with respect to the area of the illumination light spectrum from 400 nm to 800 nm.

  Further, the present invention is characterized in that a plurality of illumination lights having different spectra can be selected and emitted in the illumination device configured as described above.

  Further, the present invention is characterized in that the lighting device having the above-described configuration includes a plurality of the LED elements, and each of the LED elements emits light in a different color. According to this configuration, the plurality of LED elements emit light in different colors and mix colors, and illumination light having a predetermined spectrum is emitted.

  According to the present invention, the illumination device having the above-described configuration includes the LED element that emits a light bulb color, the LED element that emits red light, and the LED element that emits white light. According to this configuration, illumination light having a predetermined spectrum is emitted by mixing the light bulb color emitted from the plurality of LED elements with red and white.

  Further, the present invention is characterized in that the illumination device having the above-described configuration includes a phosphor that converts the emitted light of the LED element into a different wavelength. According to this configuration, the emitted light from the LED element and the fluorescent light from the phosphor are mixed, and illumination light having a predetermined spectrum is emitted.

  According to the present invention, in the illumination device having the above configuration, the LED element that emits blue light, the phosphor that converts blue light into light bulb light, the phosphor that converts blue light into red light, and blue And a phosphor that converts light into yellow light.

  According to this configuration, the light emitted from the LED element and the yellow fluorescence from the phosphor are mixed to form white light. The white light, red fluorescence by the phosphor, and light bulb color fluorescence by the phosphor are mixed to emit illumination light having a predetermined spectrum.

  According to the present invention, the area from 600 nm to 700 nm is not less than 30% and not more than 70%, the area from 400 nm to 500 nm is not more than 20%, and the spectrum of illumination light is 600 nm. The LED element emits light that emits illumination light having a maximum value in the range from 700 nm to 700 nm, and the maximum value of the spectrum from 500 nm to 600 nm is 70% or less.

  For this reason, a user's comfort feeling and a relaxed feeling can be improved at the time of a break or group. In addition, it is possible to reduce fatigue during the user's work. In addition, since the illumination light is emitted by the light emission of the LED element, illumination can be performed without including ultraviolet rays that have a chemical adverse effect on the human body and infrared rays that have a thermal adverse effect.

The perspective view which shows the illuminating device of embodiment of this invention. The top view which shows the light source board | substrate of the illuminating device of embodiment of this invention. The block diagram which shows the structure of the illuminating device of embodiment of this invention. Explanatory drawing which shows the structure of the LED element light emission mechanism of the illuminating device of embodiment of this invention. The figure which shows the spectrum of the illumination light of the illuminating device of 1st Example of this invention. The figure which shows the spectrum of the illumination light of the illuminating device of 2nd Example of this invention. The figure which shows the spectrum of the illumination light of the illuminating device of 3rd Example of this invention. The figure which shows the spectrum of the illumination light of the illuminating device of 4th Example of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an overall perspective view of a lighting device according to an embodiment as viewed from below. The lighting device 100 constitutes a ceiling light that is a lighting fixture, and is attached to an indoor ceiling surface. The lighting device 100 may be a lighting fixture attached to a side wall of a room.

  The illuminating device 100 includes a substantially plate-shaped main body 1 having a circular shape fixed to an indoor ceiling surface located above, and illuminates a lower indoor floor surface. The main body 1 includes a light source substrate 2, a reflecting plate 3, a frame 4, and an illumination control unit 5.

  The light source substrate 2 is formed in a rectangular shape in plan view, and is attached to the lower surface of the main body 1 via the frame 4 while standing upright or substantially perpendicular to the main body 1. A plurality of white LED elements 6a, light bulb color LED elements 6b, and red LED elements 6c (see FIG. 2) are provided on the surface of the light source substrate 2. In the following description, the white LED element 6a, the light bulb color LED element 6b, and the red LED element 6c may be collectively referred to as the LED element 6.

  The reflection plate 3 is provided on the lower surface of the main body 1 and on the radially outer portion of the light source substrate 2. The reflector 3 reflects the light emitted from the LED element 6 toward the floor surface, and the reflected light irradiates the floor surface. Thereby, the illumination intensity of the whole floor surface is obtained.

  The frame 4 has a regular polygon (for example, a regular octagon in FIG. 1) or a substantially regular polygon centered on a central axis extending in the vertical direction of the main body 1. The light source substrate 2 is attached to each side of the regular octagon of the frame 4 so that the light emission direction of the LED elements 6 faces radially outward. The LED element 6 emits light radially outward with respect to the center of the main body 1, and the light is reflected by the reflector 3.

  The illumination control unit 5 has a control board (not shown) including a power circuit (see FIG. 3) and the like, and is arranged on the inner side in the radial direction of the frame 4. The illumination control unit 5 is connected to a power connector (not shown) provided at the central portion of the main body 1 in the radial direction, and receives power from an external power source through the power connector. And the illumination control part 5 supplies the electric power to the LED element 6, and makes the LED element 6 light-emit.

  Although not shown for convenience of explanation, a diffusing lens or a cover may be provided. The diffusion lens is attached to the front surface of the light emitting surface of the light source substrate 2 and uniformly diffuses the light emitted from the LED element 6. The cover has a circular shape that is substantially the same diameter as the outer diameter of the main body 1 and is fitted and held on the peripheral edge of the main body 1 to cover the entire lower surface of the main body 1. The cover further diffuses the light emitted from the LED element 6 and prevents a person from directly viewing the light.

  In this way, since the LED device 6 does not directly illuminate the floor surface in the lighting device 100, even when a person faces the ceiling and looks directly at the illumination, the light of the LED element 6 is difficult to be directly inserted into the human eye. The burden can be reduced.

  FIG. 2 shows a plan view of the light source substrate 2. On the light source substrate 2, a plurality of white LED elements 6a, light bulb color LED elements 6b, and red LED elements 6c are arranged, for example, in a substantially horizontal row. In the present embodiment, nine white LED elements 6a, four bulb-color LED elements 6b, and three red LED elements 6c are mounted on the light source substrate 2.

  The arrangement and interval of the LED elements 6 affect the uniformity of light emission to the reflector 3. When the light emission to the reflector 3 becomes non-uniform, illuminance unevenness or the like occurs, and the illumination quality of the illumination device 100 is degraded. In particular, when each LED element 6 emits light in a different color and performs toning with the combination thereof, non-uniform illuminance causes color unevenness and greatly affects the illumination quality of the illumination device 100. Therefore, when using the several LED element 6 which light-emits with a different color, the arrangement | positioning and space | interval become especially important.

  The white LED element 6c emits white light. The light bulb color LED element 6b emits light in a light bulb color. More specifically, the light bulb color LED element 6b is a color belonging to a color matching range represented by a Magdam ellipse 5-step centered on a point (0.445, 0.408) on an xy chromaticity diagram determined by the International Lighting Commission. Flashes on. The red LED element 6c emits red light. More specifically, the red LED element 6c emits light in a color having a maximum wavelength value of 575 nm to 780 nm.

  Here, the color of the light bulb color LED element 6b belongs to the same color range represented by the Magdam ellipse 5-step centered on the point (0.445, 0.408) on the xy chromaticity diagram as described above. And there is some variation. The color of the red LED element 6c also has a certain range with the maximum value of the wavelength being 575 nm to 780 nm as described above.

  For this reason, as shown in FIG. 2, a plurality of white LED elements 6a, a plurality of light bulb color LED elements 6b, and a plurality of red LED elements 6c can be mounted on the light source substrate 2 to suppress variation in coloring. A plurality of LED elements having different colors may be configured as one LED element.

  Next, a detailed configuration related to the control of the illumination device 100 will be described with reference to FIGS. 3 and 4 in addition to FIG. FIG. 3 is a block diagram showing the configuration of the lighting device 1, and FIG. 4 is an explanatory diagram showing the configuration of the LED element light emitting mechanism of the lighting device 1.

  The illumination control unit 5 includes a power supply circuit 10 as shown in FIG. The power supply circuit 10 receives power supplied from an AC power supply (AC input, 100 V), converts the power into a DC voltage, and supplies power to each unit of the lighting device 100. In the present embodiment, the power supply circuit 10 is shown as supplying power to the control power supply circuit 14 and the light source substrate 2 as an example. However, the present invention is not limited to this and is also necessary for other parts. It is assumed that power is supplied.

  In addition to the power supply circuit 10, the illumination control unit 5 includes a CPU (Central Processing Unit) 11, a memory 12, a PWM (Pulse Width Modulation) control circuit 13, a control power supply circuit 14, and an input unit 15. Yes. As an example, the CPU 11, the memory 12, and the PWM control circuit 13 are configured by a microcomputer.

  The CPU 11 is connected to each unit and instructs an operation necessary for controlling the entire lighting device 100. The CPU 11 is connected to a switch such as a remote controller 50 (see FIG. 6) wirelessly or by wire, and receives an instruction input in response to an operation of the switch at the input unit 15.

  The memory 12 stores various programs and initial values for controlling the lighting device 100 and is also used as a working memory for the CPU 11. The PWM control circuit 13 generates a PWM pulse necessary for driving the LED element 6 in accordance with an instruction from the CPU 11. The control power supply circuit 14 adjusts the voltage of the power supplied from the power supply circuit 10 to supply it to the CPU 11.

  As described above, the light source substrate 2 is provided with the three types of LED elements 6 including the white LED element 6a, the bulb-colored LED element 6b, and the red LED element 6c, and an FET (Field for driving each LED element 6). Effect Transistor) switches 21, 22, and 23 are arranged.

  For convenience of explanation, FIG. 3 shows a white LED element 6a, a light bulb color LED element 6b, and a red LED element 6c, respectively. However, as shown in FIG. 2, the white LED element 6a and the light bulb color LED are drawn. A plurality of elements 6b and red LED elements 6c are provided. The FET switches 21, 22, and 23 may be in the PWM control circuit 13.

  Next, the details of the light emitting mechanism of the LED element 6 will be described. The CPU 11 instructs the PWM control circuit 13 to generate and output PWM pulses M1, M2, and M3 for emitting at least one of the white LED element 6a, the light bulb color LED element 6b, and the red LED element 6c.

  The white LED element 6 a, the light bulb color LED element 6 b and the red LED element 6 c are supplied with necessary power from the power supply circuit 10. FET switches 21, 22, and 23 are provided between the white LED element 6a, the light bulb color LED element 6b, the red LED element 6c, and the ground voltage GND, respectively.

  In response to the PWM pulses M1, M2, and M3, the FETs 21, 22, and 23 are turned on and off, whereby current is supplied to and cut off from the white LED element 6a, the light bulb color LED element 6b, and the red LED element 6c. When current is supplied to the white LED element 6a, the light bulb color LED element 6b, and the red LED element 6c, each of these LED elements 6 emits light. In addition, although the structure which light-emits the white LED element 6a, the light bulb color LED element 6b, and the red LED element 6c was demonstrated, it is the same also when the other LED element is provided with two or more.

  CPU11 judges the timing which performs illumination by running a program according to the operation signal inputted in input part 15. For example, the lighting timing may be determined by pressing a switch (not shown). Alternatively, the timing of lighting may be determined when it is detected that a preset time has been reached or a preset time has elapsed by a timer or the like (not shown).

  When illumination is instructed, the CPU 11 instructs the PWM control circuit 13 so that the white LED element 6a, the light bulb color LED element 6b, and the red LED element 6c emit light with a predetermined intensity. The PWM control circuit 13 outputs PWM pulses M1, M2, and M3 in accordance with an instruction from the CPU 11, and adjusts the color to a predetermined illumination color.

  The spectrum of the illumination light of the illumination device 100 is such that the area from 600 nm to 700 nm is 30% or more and 70% or less, and the area from 400 nm to 500 nm is 20% or less with respect to the area from 400 nm to 800 nm. . Moreover, the maximum value of the spectrum of illumination light is included in the range of wavelengths from 600 nm to 700 nm. In addition, the maximum value of the spectrum in the range where the wavelength of the illumination light is 500 nm to 600 nm is 70% or less of the maximum value of the spectrum in the range of the wavelength from 600 nm to 700 nm.

  By emitting illumination light having the above spectrum into a living room during a break or in a group, the user's comfort and feeling of relaxation can be improved. In addition, it is possible to reduce the feeling of fatigue during the user's work due to a work load such as business or housework.

  According to the present embodiment, the area from 600 nm to 700 nm is 30% to 70% and the area from 400 nm to 500 nm is 20% or less with respect to the area from 400 nm to 800 nm of the spectrum, and the spectrum of the illumination light is The LED element emits light that emits illumination light having a maximum value between 600 nm and 700 nm, and the maximum value of the spectrum from 500 nm to 600 nm is 70% or less of the maximum value.

  For this reason, a user's comfort feeling and a relaxed feeling can be improved at the time of a break or group. In addition, it is possible to reduce a feeling of fatigue when the user performs work such as business or housework. In general, fluorescent lamps may leak ultraviolet rays, and incandescent bulbs are said to emit a large amount of infrared rays. Ultraviolet rays may have a chemical adverse effect on living organisms and indoor facilities, and infrared rays may have a thermal adverse effect. However, since the illumination is performed by the light emission of the LED element 6 that contains almost no ultraviolet rays or infrared rays, the illumination device 100 with less adverse effects on the human body can be provided.

  Note that a plurality of illumination lights having different spectra included in the above range may be selected and emitted. Thereby, improvement of work efficiency and sleep efficiency can be aimed at according to a user's state.

  Further, since the white LED element 6a, the light bulb color LED element 6b, and the red LED element 6c that are colored in different colors are included, illumination light having a spectrum in the above range can be easily emitted.

  In the present embodiment, the illumination color may be adjusted by the LED elements 6 having other emission colors. For example, a plurality of LED elements that respectively emit blue, green, and red light may be provided.

  Moreover, you may provide the fluorescent substance which converts the emitted light of a LED element and a LED element into a different wavelength. For example, a plurality of LED elements that emit blue light and a phosphor that converts blue light into a light bulb color, red, and yellow may be provided corresponding to each LED element. White light is formed by blue light and yellow light, and the illumination color can be adjusted by white, light bulb color, and red light in the same manner as described above.

  Moreover, although the lighting fixture attached in a living room is comprised with the illuminating device 100, the illuminating device which comprises the light bulb etc. which are attached to a lighting fixture may be sufficient.

  Hereinafter, examples and comparative examples in which the color of the illumination light is changed in order to perform evaluation with illumination light of the illumination device 100 of the present embodiment will be described. Table 1 shows the specifications of the illumination light of each example and each comparative example.

  FIG. 5 shows the spectrum of the illumination light of the illumination device 1 of the first embodiment. In the figure, the vertical axis represents intensity, and the horizontal axis represents wavelength (unit: nm). The spectrum of the illumination light has an area ratio of 400 nm to 500 nm of 3%, an area ratio of 400 nm to 500 nm of 18%, an area ratio of 500 nm to 600 nm of 18%, and an area ratio of 600 nm to 700 nm of 42%. The ratio of the area from 700 nm to 800 nm is 37%.

  The maximum value of the spectrum is included in the wavelength range of 600 nm to 700 nm. Further, the maximum value of the spectrum in the wavelength range of 500 nm to 600 nm is 50% of the maximum value of the spectrum in the range of 600 nm to 700 nm.

  FIG. 6 shows the spectrum of the illumination light of the illumination device 1 of the second embodiment. In the figure, the vertical axis represents intensity, and the horizontal axis represents wavelength (unit: nm). The spectrum of the illumination light has an area ratio of 400 nm to 500 nm of 7%, an area ratio of 500 nm to 600 nm of 29%, an area ratio of 600 nm to 700 nm of 57%, with respect to an area having a wavelength of 400 nm to 800 nm. The ratio of the area from 700 nm to 800 nm is 7%.

  The maximum value of the spectrum is included in the wavelength range of 600 nm to 700 nm. The maximum value of the spectrum in the wavelength range of 500 nm to 600 nm is 28% of the maximum value of the spectrum in the range of 600 nm to 700 nm.

  FIG. 7 shows the spectrum of the illumination light of the illumination device 1 of the third embodiment. In the figure, the vertical axis represents intensity, and the horizontal axis represents wavelength (unit: nm). The spectrum of the illumination light has an area ratio from 400 nm to 500 nm of 18%, an area ratio from 400 nm to 500 nm is 18%, an area ratio from 500 nm to 600 nm is 41%, an area ratio from 600 nm to 700 nm is 35%, The ratio of the area from 700 nm to 800 nm is 6%.

  The maximum value of the spectrum is included in the wavelength range of 600 nm to 700 nm. The maximum value of the spectrum in the wavelength range of 500 nm to 600 nm is 42% of the maximum value of the spectrum in the range of 600 nm to 700 nm.

  FIG. 8 shows the spectrum of the illumination light of the illumination device 1 of the fourth embodiment. In the figure, the vertical axis represents intensity, and the horizontal axis represents wavelength (unit: nm). The spectrum of the illumination light has an area ratio of 400 nm to 500 nm of 19%, an area ratio of 500 nm to 600 nm of 44%, an area ratio of 600 nm to 700 nm of 31% with respect to an area of wavelength 400 nm to 800 nm, The ratio of the area from 700 nm to 800 nm is 6%.

  The maximum value of the spectrum is included in the wavelength range of 600 nm to 700 nm. Further, the maximum value of the spectrum in the wavelength range of 500 nm to 600 nm is 66% of the maximum value of the spectrum in the range of 600 nm to 700 nm.

[Comparative Example 1]
In addition, the spectrum of the illumination light of the illumination device 1 of the comparative example 1 compared with each example is 18% of the area ratio of 400 nm to 500 nm and the ratio of the area of 500 nm to 600 nm with respect to the area of wavelength 400 nm to 800 nm. Is 40%, the area ratio from 600 nm to 700 nm is 25%, and the area ratio from 700 nm to 800 nm is 17%.

  The maximum value of the spectrum is included in the wavelength range of 600 nm to 700 nm. The maximum value of the spectrum in the wavelength range of 500 nm to 600 nm is 68% of the maximum value of the spectrum in the range of 600 nm to 700 nm.

[Comparative Example 2]
The spectrum of the illumination light of the illumination device 1 of Comparative Example 2 is that the wavelength ratio is 400% to 800 nm, the area ratio of 400 nm to 500 nm is 4%, the area ratio of 500 nm to 600 nm is 18%, and 600 nm to 700 nm. The area ratio is 75%, and the area ratio from 700 nm to 800 nm is 3%.

  The maximum value of the spectrum is included in the wavelength range of 600 nm to 700 nm. Further, the maximum value of the spectrum in the wavelength range of 500 nm to 600 nm is 24% of the maximum value of the spectrum in the range of 600 nm to 700 nm.

[Comparative Example 3]
The spectrum of the illumination light of the illumination device 1 of Comparative Example 3 is that the area ratio from 400 nm to 500 nm is 3%, the area ratio from 500 nm to 600 nm is 13%, and the area ratio from 500 nm to 600 nm is 13%, from 600 nm to 700 nm. The area ratio is 50%, and the area ratio from 700 nm to 800 nm is 34%.

  The maximum value of the spectrum is included in the wavelength range of 600 nm to 700 nm. The maximum value of the spectrum in the wavelength range of 500 nm to 600 nm is 16% of the maximum value of the spectrum in the range of 600 nm to 700 nm.

[Comparative Example 4]
The spectrum of the illumination light of the illumination device 1 of Comparative Example 4 is that the area ratio from 400 nm to 500 nm is 4%, the area ratio from 500 nm to 600 nm is 47%, and the area ratio from 500 nm to 600 nm is 47%, from 600 nm to 700 nm. The area ratio is 48%, and the area ratio from 700 nm to 800 nm is 1%.

  The maximum value of the spectrum is included in the wavelength range of 600 nm to 700 nm. Further, the maximum value of the spectrum in the wavelength range of 500 nm to 600 nm is 65% of the maximum value of the spectrum in the range of 600 nm to 700 nm.

[Comparative Example 5]
The spectrum of the illumination light of the illuminating device 1 of Comparative Example 5 is such that the ratio of the area of 400 to 500 nm is 22%, the ratio of the area of 500 to 600 nm is 20%, and the ratio of the area of 500 to 600 nm is 20% and 600 to 700 nm. The area ratio is 56%, and the area ratio from 700 nm to 800 nm is 2%.

  The maximum value of the spectrum is included in the wavelength range of 600 nm to 700 nm. The maximum value of the spectrum in the wavelength range of 500 nm to 600 nm is 60% of the maximum value of the spectrum in the range of 600 nm to 700 nm.

[Comparative Example 6]
The spectrum of the illumination light of the illuminating device 1 of Comparative Example 6 is that the area ratio from 400 nm to 500 nm is 18%, the area ratio from 500 nm to 600 nm is 12%, and the area ratio from 500 nm to 600 nm is 12%, from 600 nm to 700 nm. The area ratio is 31%, and the area ratio from 700 nm to 800 nm is 39%.

  The maximum value of the spectrum is included in the wavelength range of 700 nm to 800 nm. The maximum value of the spectrum in the wavelength range of 500 nm to 600 nm is 45% of the maximum value of the spectrum in the range of 600 nm to 700 nm.

[Comparative Example 7]
The spectrum of the illumination light of the illuminating device 1 of Comparative Example 7 is that the area ratio from 400 nm to 500 nm is 17%, the area ratio from 500 nm to 600 nm is 40%, and the area ratio from 500 nm to 600 nm is 40% to 600 nm to 700 nm. The area ratio is 34%, and the area ratio from 700 nm to 800 nm is 9%.

  The maximum value of the spectrum is included in the wavelength range of 600 nm to 700 nm. Further, the maximum value of the spectrum in the wavelength range of 500 nm to 600 nm is 75% of the maximum value of the spectrum in the range of 600 nm to 700 nm.

[Comparative Example 8]
The illumination light of the illuminating device 1 of Comparative Example 8 is a light bulb color, and the spectrum of the illumination light has a ratio of the area of 400 nm to 500 nm to a wavelength of 400 nm to 800 nm is 13%, and the ratio of the area of 500 nm to 600 nm. 42%, the ratio of the area from 600 nm to 700 nm is 41%, and the ratio of the area from 700 nm to 800 nm is 4%.

  The maximum value of the spectrum is included in the wavelength range of 600 nm to 700 nm. Further, the maximum value of the spectrum in the wavelength range of 500 nm to 600 nm is 98% of the maximum value of the spectrum in the range of 600 nm to 700 nm.

  Note that “lunch white” and “bulb color” correspond to the light source colors defined in the JIS standard (JIS Z 8110).

  The following experiments were performed for each of the above Examples and Comparative Examples to compare with daylight white illumination light. The daylight white spectrum has an area ratio of 400 nm to 800 nm, an area ratio of 400 nm to 500 nm is 24%, an area ratio of 500 nm to 600 nm is 47%, and an area ratio of 600 nm to 700 nm is 24%, 700 nm. The ratio of the area of 800 nm to 5% is 5%.

  The maximum value of the daylight white spectrum is included in the wavelength range of 400 nm to 500 nm. Further, the maximum value of the spectrum in the wavelength range of 500 nm to 600 nm is 125% of the maximum value of the spectrum in the range of 600 nm to 700 nm.

  A total of 32 subjects were selected from 16 healthy men and 16 males and 16 females. In the first experiment, subjects were kept waiting for each room from the evening to the morning of the following day, and all the subjects were in the same environmental condition, and were irradiated with each illumination light from 1 hour before bedtime to bedtime. The illuminance of the illumination light was equivalent to 35 W (about 45 lx) at the pillow position. Similarly, it was compared with the case where the daylight white color (correlated color temperature 5000K) was irradiated at 35 W equivalent (about 85 lx).

  In the second experiment, subjects were kept waiting for each room in the daytime, and all subjects had the same environmental condition, and each illumination light was irradiated for 30 minutes during the working time. The illuminance of the illumination light was equivalent to 100 W (about 600 lx) on the desk on which work was performed. And it compared with the evaluation at the time of irradiating lunch white by equivalent to 100W similarly.

  The work load used was “Uchida-Kraepelin Test (registered trademark)” of the Japan Institute of Mental Technology. The content of the inspection is a calculation workload for performing a simple one-digit addition every 30 minutes while changing the line every minute.

  Table 2 shows the evaluation items according to the first and second experiments. In the first experiment, subjective evaluation before going to bed and during sleep, and evaluation based on measurement of sleep status were performed (evaluation items 1 to 22). In the second experiment, the autonomic nervous system, work efficiency, and fatigue were evaluated (evaluation items 23 to 25).

  For the subjective evaluation before going to bed, VAS (Visual Analogue Scale) used when evaluating the intensity of sensation / feeling was used. In this evaluation method, on one straight line representing the worst sense at one end and the best sense at the other end, a mark is applied to the point adapted to the strength of the sense and emotion regarding the question item felt by the subject at that time. By measuring the length from the position of the sign to one end, the subjective feeling is quantified and scored.

  The question items are "comfort (evaluation item 1)", "motivation (evaluation item 2)", "fatigue (evaluation item 3)", "drowsiness (evaluation item 4)", "feeling of fulfillment (evaluation item 5)" ”,“ Relaxation (Evaluation Item 6) ”,“ Irritation (Evaluation Item 7) ”, and“ Warmness (Evaluation Item 8) ”.

  The subjective evaluation at the time of sleep used a self-administered questionnaire that evaluates the sleep for 24 hours just before called the St. Mary's Hospital Sleep Questionnaire. The question items are "subjective sleep depth (evaluation item 9)", "number of times I woke up (evaluation item 10)", "whether you slept well (evaluation item 11)", "whether the head was clean (Evaluation Item 12), “Sleep Satisfaction (Evaluation Item 13)”, “Whether Awakened in the Early Morning (Evaluation Item 14)”, and “Sleeping Situation (Evaluation Item 15)”.

  For the measurement of the sleep state, a sleep measurement system “Sleep SCAN (registered trademark)” manufactured by Paramount Bed Co., Ltd. was used. A sleep measurement system was placed under the bed to measure the amount of activity of each subject sleeping. Based on the acquired activity amount, the average activity amount (evaluation item 16), sleep latency (evaluation item 17), sleep efficiency (evaluation item 18), number of awakenings (evaluation item 19), number of getting out of bed (evaluation item 20) ), Total sleep time (evaluation item 21), midway awakening time (evaluation item 22).

  For evaluation of the autonomic nervous system (evaluation item 23), an acceleration pulse wave measurement system “Altet C (registered trademark)” manufactured by Yumedica Co., Ltd. was used. The acceleration pulse wave measurement system measures acceleration pulse waves during and before and after the work, and performs frequency analysis of the time change data. Thereby, LF, HF, and LF / HF, which are indices of autonomic nervous function, were calculated, and the state of the autonomic nervous system was evaluated.

  For the work efficiency (evaluation item 24), the amount of calculation based on the work load for 30 minutes was counted. The degree of fatigue (evaluation item 25) was evaluated by conducting a blood test that measures TGF-beta in the blood sampled by blood collection.

  Table 3 shows the results of the first and second experiments for each example and each comparative example. As the evaluation of the results, the results of all the subjects were statistically analyzed, and a significant difference test between each illumination light and daylight white was performed. A t-test was used as the test method, and the case where there was a significant difference in improvement with a significance level of 5% was indicated by “◯”. A significance probability of less than 10% was evaluated as having an improvement tendency and indicated by “Δ”. The case where there is no significant difference or trend of improvement is indicated by “x”.

  According to the results of the first experiment and the second experiment, the illumination light of Examples 1 to 4 has a useful result in the subjective evaluation before going to bed and the evaluation at the work as compared with the daytime white. That is, it is possible to give the user a feeling of comfort and relaxation during a break and to reduce fatigue during work.

  Moreover, about Example 1, 2, the item regarding sleep is improving or improving, and sleep efficiency etc. can be improved. Furthermore, the working efficiency of Example 1, Example 3, and Example 4 is improved or tends to improve.

  On the other hand, Comparative Example 1 has a spectrum in which the ratio of the area of 600 nm to 700 nm is smaller than 30% with respect to the area of the wavelength of 400 nm to 800 nm. I couldn't see it. Comparative Example 2 has a spectrum in which the ratio of the area of 600 nm to 700 nm is greater than 70% with respect to the area of the wavelength of 400 nm to 800 nm, and no significant difference or trend was observed compared to daylight white.

  Comparative Example 3 had a spectrum in which the ratio of the area of 500 nm to 600 nm was less than 15% with respect to the area of the wavelength of 400 nm to 800 nm, and no significant difference or trend was observed compared with daylight white. Comparative Example 4 had a spectrum in which the ratio of the area from 500 nm to 600 nm was greater than 45% with respect to the area having a wavelength of 400 nm to 800 nm, and no significant difference or trend was observed compared to daylight white.

  The comparative example 5 has a spectrum in which the ratio of the area of 400 nm to 500 nm is larger than 10% with respect to the area of the wavelength of 400 nm to 800 nm, and no significant difference or tendency was observed compared with daylight white. In Comparative Example 6, the maximum value of the spectrum was included in the range of 700 nm to 800 nm, and no significant difference or tendency was observed compared with daylight white.

  In Comparative Example 7 and Comparative Example 8, the ratio of the maximum value of the spectrum in the range of 500 nm to 600 nm to the maximum value of the spectrum in the range of 600 nm to 700 nm is greater than 70%. In Comparative Example 7, no significant difference or trend was observed compared with daytime white. Moreover, although the comparative example 8 of the lightbulb color showed the significant difference about the subjectivity (warmth feeling) compared with lunch white, the significant difference and the tendency were not seen about the other evaluation items.

  INDUSTRIAL APPLICABILITY According to the present invention, it can be used for lighting devices such as lighting fixtures and light bulbs that illuminate a living room.

DESCRIPTION OF SYMBOLS 1 Main body 2 Light source board 3 Reflector 4 Frame 5 Illumination control part 6a White LED element 6b Light bulb color LED element 6c Red LED element 100 Illumination device

Claims (7)

In an illuminating device that performs illumination by emitting illumination light by light emission of an LED element, an area from 600 nm to 700 nm is 42 % or more and 57 % or less , an area from 500 nm to 600 nm, with respect to an area of the illumination light spectrum from 400 nm to 800 nm. Is 18% to 29%, and the area from 400 nm to 500 nm is 7 % or less,
An illumination device, wherein the spectrum of illumination light has a maximum value between 600 nm and 700 nm, and the maximum value of a spectrum from 500 nm to 600 nm is 50 % or less with respect to the maximum value. In an illuminating device that performs illumination by emitting illumination light by light emission of an LED element, an area from 600 nm to 700 nm is 31% or more and 42% or less, and an area from 500 nm to 600 nm with respect to an area of 400 nm to 800 nm of the spectrum of the illumination light 18% or more and 44% or less, and the area from 400 nm to 500 nm is 19% or less,
An illumination device, wherein the spectrum of illumination light has a maximum value between 600 nm and 700 nm, and the maximum value of the spectrum from 500 nm to 600 nm is 66% or less with respect to the maximum value .   The illumination device according to claim 1, wherein a plurality of illumination lights having different spectra can be selected and emitted.   The lighting device according to claim 1, wherein the lighting device includes a plurality of the LED elements, and each of the LED elements emits light in a different color.   The lighting device according to claim 4, comprising the LED element that emits a light bulb color, the LED element that emits red light, and the LED element that emits white light.   The illuminating device according to any one of claims 1 to 3, further comprising a phosphor that converts light emitted from the LED element to a different wavelength.   The LED element that emits blue light, the phosphor that converts blue light into light bulb color light, the phosphor that converts blue light into red light, and the phosphor that converts blue light into yellow light. The illumination device according to claim 6, further comprising: