JP2013171684A - Lighting device - Google Patents

Abstract

An illumination device capable of reducing human stress is provided.
A lighting device includes a color matching temperature line W1 passing through a point A (0.350, 0.311) and black on an xy chromaticity diagram defined by the International Lighting Commission by light emission of at least one LED element. For the equal deviation line V1 with respect to the body radiation locus V0, the color matching temperature line W2 passing through the point B (0.397, 0.370), and the black body radiation locus V0 passing through the point C (0.388, 0.378). The illumination light of the illumination color in the region S1 surrounded by the equal deviation line V2 and the straight line connecting the point B and the point C is emitted.
[Selection] Figure 5

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, it has been required to elucidate the effects of lighting on the human body existing in the environment. In particular, what kind of lighting environment should be provided to many people who have various stresses is an important concern. On the other hand, the conventional lighting device does not contribute to the creation of an environment in which human stress can be eliminated, and there is a problem in that user stress cannot be eliminated.

  This invention is made | formed in view of said point, and it aims at providing the illuminating device which can reduce a person's stress.

  In order to solve the above-described problems, the lighting device of the present invention passes through point A (0.350, 0.311) on the xy chromaticity diagram defined by the International Lighting Commission by light emission of at least one LED element. An equal deviation line with respect to the color matching temperature line and the black body radiation locus, a color matching temperature line passing through the point B (0.397, 0.370), and a black body radiation passing through the point C (0.388, 0.378). The illumination light of the illumination color in the area | region enclosed by the equal deviation line with respect to a locus | trajectory and the straight line which connects the point B and the point C is emitted.

  According to this configuration, yellowish white or light pink illumination color illumination light is emitted by the light emission of the LED element. Thereby, the excitement of the sympathetic nervous system due to stress can be suppressed. Therefore, when a person who feels stress spends in a room illuminated with the illumination color of the lighting device, the stress is reduced.

  Further, in the illumination device having the above configuration, the illumination color belongs to a color matching range represented by a Magdam ellipse 5-step centered on a point (0.377, 0.362) on the xy chromaticity diagram. It is characterized by that.

  In the illumination device having the above-described configuration, the illumination color belongs to a color matching range represented by a Magdam ellipse 1-step centered on a point (0.377, 0.362) on the xy chromaticity diagram. It is characterized by that.

  In the illumination device having the above-described configuration, a plurality of the LED elements are provided, 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 are mixed, and illumination light of the illumination color in the region is emitted.

  Further, 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, the light bulb color emitted from the plurality of LED elements, red color, and white color are mixed to emit illumination light of the illumination color in the region.

  In the illumination device having the above-described configuration, the LED element that emits a light bulb color is a color matching range represented by a Magdam ellipse 5-step centered on a point (0.445, 0.408) on the xy chromaticity diagram. The maximum value of the wavelength of the LED element that emits red light is 575 nm to 780 nm.

  In the illumination device having the above-described configuration, the color of the illumination light is variable between the color in the region and the white color. According to this configuration, in addition to emitting illumination light of the illumination color in the region, the illumination device emits illumination light by mixing the illumination color with a color between the color in the region and white. .

  Moreover, the illumination device having the above-described configuration is characterized in that a phosphor that converts the emitted light of the LED element into a different wavelength is provided. According to this configuration, the emitted light of the LED element and the fluorescent light from the phosphor are mixed, and the illumination light of the illumination color in the region is emitted.

  Further, in the illumination device having the above-described configuration, the LED element that emits blue light, the phosphor that converts blue light into light bulb color, the phosphor that converts blue light into red light, and yellow light as yellow light. And the phosphor that converts 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 of the illumination color in the region.

  According to the configuration of the present invention, the illuminating device has an isodeviation line with respect to the color temperature line passing through the point A (0.350, 0.311) and the black body radiation locus on the xy chromaticity diagram, and the point B (0 .397, 0.370), an equal deviation line with respect to a black body radiation locus passing through point C (0.388, 0.378), and a straight line connecting point B and point C. Illumination by the illumination color in the area to be illuminated is performed by light emission of the LED element.

  For this reason, a user's stress can be reduced. In addition, since the illumination light of the illumination color in the region is emitted by the light emission of the LED element, it is possible to perform illumination without including ultraviolet rays that have a chemical adverse effect on the human body and infrared rays that have a thermal adverse effect. it can.

It is a perspective view which shows the illuminating device of embodiment of this invention. It is a top view which shows the light source board | substrate of the illuminating device of embodiment of this invention. It is a block diagram which shows the structure of the illuminating device of embodiment of this invention. It is explanatory drawing which shows the structure of the LED element light emission mechanism of the illuminating device of embodiment of this invention. It is xy chromaticity diagram which shows the illumination color of the illuminating device of embodiment of this invention. It is xy chromaticity diagram which shows the illumination color of the illuminating device of each Example and each comparative 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 the lighting device 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 illuminating device 100 may be a lighting fixture attached to a side wall in the 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 a remote controller (not shown), 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. On the surface of the light source substrate 2, a plurality of LED (Light Emitting Diode) elements (6a, 6b, 6c, see FIG. 2) are provided. 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.

  As shown in FIG. 1, the reflecting 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 6 a, four light bulb color LED elements 6 b and three red LED elements 6 c 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 (not shown) 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 FET switches 21, 22, and 23 are turned on and off, so that 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.

  Each LED element 6 emits light with a light amount corresponding to an operation of a remote controller (not shown) by the light emitting mechanism, and illumination lights of a plurality of illumination colors described below are emitted.

  FIG. 5 shows a detailed view near the black body radiation locus V0 of the xy chromaticity diagram determined by the International Commission on Illumination. In the same figure, a uniform color temperature line group and a uniform deviation line group with respect to the black body radiation locus V0 are described in an overlapping manner. The illuminating device 100 on the xy chromaticity diagram passes through the color matching temperature line W1 and the equal deviation line V1 passing through the point A (0.350, 0.311) and the point B (0.397, 0.370). The illumination light of the illumination color in the region S1 surrounded by the color temperature line W2, the equal deviation line V2 passing through the point C (0.388, 0.378), and the straight line connecting the point B and the point C is emitted. .

  Point A indicates a point where the correlated color temperature is 4500 K and the deviation Δuv = −0.025 with respect to the blackbody radiation locus V0. Point B represents a point having a correlated color temperature of 3500 K and a deviation Δuv = −0.008 with respect to the blackbody radiation locus V0. Point C represents a point where the correlated color temperature is 3800 K and the deviation Δuv = −0.001 with respect to the blackbody radiation locus V0. Note that the chromaticity coordinates of the intersection D between the equal color temperature line W2 and the equal deviation line V1 are (0.383, 0.329), and the chromaticity of the intersection E between the equal color temperature line W1 and the equal deviation line V2 is. The coordinates are (0.359, 0.358). Accordingly, the region S1 is surrounded by points A, E, C, B, and D in the clockwise direction in the drawing.

  The region S1 is yellowish white or light pink. For this reason, the illumination device 100 emits illumination light of a yellowish white illumination color or a light pink illumination color. Thereby, the excitement of the sympathetic nervous system due to stress can be suppressed. As a result, the lighting device 100 can reduce user stress.

  “Yellow white” and “light pink” correspond to the light source colors defined in the JIS standard (JIS Z 8110).

  The lighting device 100 having the above configuration includes a plurality of lighting modes. In the illumination device 100, a desired illumination mode is selected by the remote controller. Thereby, 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 according to instructions from the CPU 11, and performs color adjustment so that the illumination color corresponds to each illumination mode.

  According to the present embodiment, the lighting device 100 emits light from the LED element 6, and the color matching temperature line W1 passing through the point A (0.350, 0.311) on the xy chromaticity diagram determined by the International Lighting Commission and An equal deviation line V1 with respect to the black body radiation locus V0, a color matching temperature line W2 passing through the point B (0.397, 0.370), and a black body radiation locus V0 passing through the point C (0.388, 0.378). Illumination light of the illumination color in the region S1 surrounded by the equal deviation line V2 and the straight line connecting the point B and the point C is emitted.

  For this reason, a user's stress can be reduced.

  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.

  In addition, 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, the illumination light of the illumination color in the region S1 can be easily emitted.

  In the above embodiment, the illumination color in the region S1 may be adjusted by the LED elements 6 having other emission colors. For example, LED elements that respectively emit blue, green, and red light may be provided.

  Further, the color of the illumination light may be varied between the color in the region S1 and white. Thereby, in addition to being able to emit the illumination light of the illumination color in the area S1, the illumination device 100 mixes the illumination color with the color between the color in the area S1 and white, and emits the illumination light. It is possible to emit.

  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, you may provide the LED element which light-emits blue, and the fluorescent substance which converts blue into light bulb color, red, and each yellow. White light is formed by blue light and yellow light, and the illumination color in the region S1 can be dimmed 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 illumination color is varied in order to evaluate the illumination color of the present embodiment using illumination light will be described. FIG. 6 shows an enlarged view of the xy chromaticity diagram of FIG. The points of the following Examples 1, 2,... Are indicated by p1, p2,..., And the points of Comparative Examples 1, 2,.

  The illuminating device 1 of Example 1 emits the illumination light of the illumination color of the point B (0.397, 0.370) (point p1 of FIG. 6) of area | region S1.

  The illuminating device 1 of Example 2 emits the illumination light of the illumination color of the point D (0.383, 0.329) (point p2 in FIG. 6) in the region S1.

  The illuminating device 1 of Example 3 emits the illumination light of the illumination color of the point C (0.388, 0.378) (point p3 in FIG. 6) in the region S1.

  The illuminating device 1 of Example 4 emits the illumination light of the illumination color of the point (0.380, 0.373) (point p4 in FIG. 6) on the equal deviation line V2 in the region S1.

  The illuminating device 1 of Example 5 emits the illumination light of the illumination color of the point F (0.377, 0.362) (point p5 in FIG. 6) inside the region S1.

  The illuminating device 1 of Example 6 emits the illumination light of the illumination color of the point (0.365, 0.322) (point p6 in FIG. 6) on the equal deviation line V1 in the region S1.

  The illuminating device 1 of Example 7 emits the illumination light of the illumination color of the point E (0.359, 0.358) (point p7 in FIG. 6) in the region S1.

  The illuminating device 1 of Example 8 emits illumination light of the illumination color of the point (0.357, 0.349) (point p8 in FIG. 6) on the color matching temperature line W1 in the region S1.

  The illuminating device 1 of Example 9 emits the illumination light of the illumination color of the point A (0.350, 0.311) (point p9 in FIG. 6) in the region S1.

[Comparative Example 1]
Further, the lighting device 1 of the comparative example 1 compared with each of the examples is close to the blackbody radiation locus V0 with respect to the point of the example 3, and has a low correlated color temperature (0.405, 0.391) (FIG. 6). The illumination light of the illumination color at point q1) is emitted.

[Comparative Example 2]
The illumination device 1 of Comparative Example 2 has the same deviation from the blackbody radiation locus V0 as compared to the point of Example 3, and has a low correlated color temperature (0.403, 0.385) (points in FIG. 6). The illumination light of the illumination color q2) is emitted.

[Comparative Example 3]
The illuminating device 1 of Comparative Example 3 emits illumination light of the illumination color of the points (0.403, 0.372) (point q3 in FIG. 6) whose correlated color temperature is lower than the point of Example 1.

[Comparative Example 4]
The illumination device 1 of the comparative example 4 emits illumination light of the illumination color of the points (0.394, 0.331) (point q4 in FIG. 6) whose correlated color temperature is lower than the point of the second embodiment.

[Comparative Example 5]
The lighting device 1 of Comparative Example 5 is far from the blackbody radiation locus V0 than the equal deviation line V1, and has a correlated color temperature lower than the color matching temperature line W2 (0.389, 0.320) (point q5 in FIG. 6). The illumination light of the illumination color is emitted.

[Comparative Example 6]
The illumination device 1 of the comparative example 6 emits illumination light of the illumination color of the point (0.390, 0.382) (point q6 in FIG. 6) closer to the blackbody radiation locus V0 than the point of the third embodiment.

[Comparative Example 7]
The illuminating device 1 of the comparative example 7 emits the illumination light of the illumination color of the point (0.378, 0.318) (point q7 in FIG. 6) farther from the black body radiation locus V0 than the point of the second embodiment.

[Comparative Example 8]
The illumination device 1 of the comparative example 8 emits illumination light of the illumination color of the point (0.381, 0.377) (point q8 in FIG. 6) closer to the blackbody radiation locus V0 than the point of the fourth embodiment.

[Comparative Example 9]
The illuminating device 1 of the comparative example 9 emits the illumination light of the illumination color of the point (0.362, 0.311) (point q9 in FIG. 6) farther from the blackbody radiation locus V0 than the point of the sixth embodiment.

[Comparative Example 10]
The illumination device 1 of the comparative example 10 emits illumination light of the illumination color of the point (0.359, 0.363) (point q10 in FIG. 6) closer to the black body radiation locus V0 than the point of the seventh embodiment.

[Comparative Example 11]
The illuminating device 1 of the comparative example 11 emits the illumination light of the illumination color of the point (0.348, 0.302) (point q11 in FIG. 6) farther from the black body radiation locus V0 than the point of the ninth example.

[Comparative Example 12]
The lighting device 1 of Comparative Example 12 is closer to the blackbody radiation locus V0 than the equal deviation line V2, and has a higher correlated color temperature (0.351, 0.357) than the equal color temperature line W1 (point q12 in FIG. 6). The illumination light of the illumination color is emitted.

[Comparative Example 13]
The illumination device 1 of the comparative example 13 emits illumination light of the illumination color of the points (0.351, 0.353) (point q13 in FIG. 6) whose correlation color temperature is higher than that of the example 7.

[Comparative Example 14]
The illumination device 1 of the comparative example 14 emits illumination light having the illumination color of the points (0.349, 0.345) (point q14 in FIG. 6) whose correlated color temperature is higher than the point of the eighth example.

[Comparative Example 15]
The illumination device 1 of the comparative example 15 emits illumination light of the illumination color of the points (0.341, 0.305) (point q15 in FIG. 6) whose correlation color temperature is higher than the point of the ninth example.

[Comparative Example 16]
The lighting device 1 of Comparative Example 16 is farther from the black body radiation locus V0 than the equal deviation line V1, and has a higher correlated color temperature (0.340, 0.295) than the uniform color temperature line W1 (point q16 in FIG. 6). The illumination light of the illumination color is emitted.

  The following experiment was conducted on each of the above Examples and Comparative Examples. In the first experiment, a total of 32 men, 16 healthy men and 16 women, were selected as subjects, and their discomfort and color preference were evaluated. Specifically, the subjects were divided into two groups, and the evaluation was performed after irradiating the subjects with illumination light by changing the illumination color in the same room. And it compared with the case where daytime white was irradiated similarly. The correlation color temperature of daytime white is about 5000 K, the deviation from the blackbody radiation locus V0 is 0, and the chromaticity coordinates are (0.345, 0.342) (point q0 in FIG. 6).

  As an evaluation method, VAS (Visual Analogue Scale) used when evaluating the intensity of sensations / feelings 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.

  In the second experiment, a total of 32 men (16 healthy men and 16 women) were selected as subjects, and the mood received from the lighting environment was evaluated.

  Evaluation by amylase measurement values was used as an evaluation method. Stress applied to the body promotes excitement of the sympathetic nervous system through the hypothalamus of the sympathetic nervous system. This excitement activates amylase as well as various digestive enzymes that promote toxic degradation in the digestive tract as a self-defense reaction in the body against external stress. By collecting salivary amylase, it is possible to determine how much stress has been applied. For measurement of amylase, a commercially available stress measuring device such as salivary amylase monitor CM-2.1 manufactured by Nipro Corporation can be used. When the measured value of amylase is 30 KU / L or less, it can be determined that there is no stress, and when it is 45 KU / L or more, it can be determined that there is a stress.

  The evaluation based on the amylase measurement value was further divided into two experimental methods. Hereinafter, the amylase experiments (1) and (2) will be described.

  The test method of the amylase experiment (1) is to divide the test subjects into two groups and make a stressful state by first performing a 30-minute Kraepelin test (computation workload) in the same room with the daytime white irradiation. Amylase measurement was performed. Then, amylase measurement was performed when illumination light of any illumination color was irradiated for 30 minutes, and then amylase measurement was performed when the illumination was returned to daylight white illumination again.

  In the amylase experiment (2), the test subjects were divided into two groups, and the amylase measurement was performed in the absence of stress by first irradiating a day white in the same room. Then, amylase measurement was performed when illumination light of any illumination color was irradiated for 30 minutes, and then amylase measurement was performed when the illumination was returned to daylight white illumination again.

  Tables 1 and 2 show the results of the first experiment and the second experiment of each example and each comparative example. As an evaluation of the results, the results of all the subjects were statistically analyzed, and a significant difference test was performed between each lighting color and daytime white. The t-test was used as the test method, and the evaluation was evaluated as “improvement (reduction)” or “deterioration” with a significance level of 5%. In addition, the significance probability of less than 10% was evaluated as “increase tendency” or “deterioration tendency” with a difference.

  According to the results of the first experiment and the second experiment, in the case of the illumination color in the area S1, there is no sense of incongruity compared with the daytime white color, the color preference tends to be improved, and the stress is reduced. In particular, in the case of the illumination color of Example 5, color preference is improved as compared with daytime white. In the case of an illumination color outside the range of the area S1, the uncomfortable feeling and the color preference are the same or tend to deteriorate or deteriorate compared to the daytime white color, and the stress is the same. Moreover, when the deviation with respect to the blackbody radiation locus V0 became large (Comparative Examples 5, 7, 9, 11, and 16), the sense of incongruity tended to deteriorate as compared with day white, and the color preference deteriorated.

  Therefore, when a person who feels stress spends in the room illuminated with the illumination color of the region S1, the illumination color is favored and the stress can be reduced.

  Here, in the article "Visual Sensitivities to Color Differenced in Daylight" by DAVID L. MACADAM published in "Journal of the OPTICAL SOCIETY of AMERCA (Volume 32, NUMBER 5)" (issued in May 1942) When a certain point on the chromaticity diagram derived from the color experiment is selected, a range that cannot be distinguished from that color has been announced. It is announced that this range becomes an ellipse when the standard deviation of the discriminating variation with respect to a specific central color is represented in the xy chromaticity diagram, and is also called a MacAdam ellipse 1-Step.

  Industrially, the 5-step of IEC (International Electrotechnical Commission) and the 7-Step of ANSI (American National Standards Institute) are recognized as “color matching” as standards for the MacAdam ellipse 1-Step. It is allowed to do. The Macadam ellipse 5-Step has a relationship that the length of each of the short side and the long side of the ellipse is five times that of the Macadam ellipse 1-Step.

  For more information on Macadam of “IEC 5-Step”, see “The International Electrotechnical Commission” in the middle of the website (http://www.lrc.rpi.edu/programs/nlpip/lightinganswers/lightsources/whatisColorConsistency.asp (IEC) standard (IEC 2002) specifies six, 5-step MacAdam ellipses as color consistency criteria for double-capped fluorescent lamps. ”And is recognized by the International Electrotechnical Commission (IEC) standard (IEC 2002) Have been described.

  “ANSI 7-Step” McAdam is represented on page 14 of the American National Standard for electric lamps-Specifications for the Chromaticity of Solid State Lighting Products (ANSI_NEMA_ANSLG C78.377-2008). FIG. A1, which is a graph of the specifications of the SSL product, is shown.

  For this reason, the illumination color of the region S1 is a color matching range S2 (FIG. 5) represented by a MacAdam ellipse 5-step centered at a point F (0.377, 0.362) (point p5 in FIG. 6) in FIG. The color to which the reference belongs may be used. Alternatively, the color may belong to a color matching range represented by the MacAdam ellipse 1-step centered on the point F.

  Although the embodiments of the present invention have been described above, the scope of the present invention is not limited to these embodiments, and various modifications can be made without departing from the spirit of the invention.

  INDUSTRIAL APPLICABILITY According to the present invention, it can be used for a lighting device such as a lighting fixture or a light bulb for illuminating a living room.

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

Claims (9)

  An isodeviation line with respect to a color temperature line passing through point A (0.350, 0.311) and a black body radiation locus on the xy chromaticity diagram defined by the International Commission on Illumination by light emission of at least one LED element; The equal color temperature line passing through the point B (0.397, 0.370), the equal deviation line for the black body radiation locus passing through the point C (0.388, 0.378), and the point B and the point C are connected. An illumination device that emits illumination light of an illumination color within an area surrounded by a straight line.   2. The illumination color according to claim 1, wherein the illumination color is a color belonging to a uniform color range represented by a Magdam ellipse 5-step centered on a point (0.377, 0.362) on an xy chromaticity diagram. The lighting device described.   2. The illumination color according to claim 1, wherein the illumination color is a color belonging to a uniform color range represented by a Magdam ellipse 1-step centered on a point (0.377, 0.362) on an xy chromaticity diagram. The lighting device described.   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 LED element that emits light bulb color is a color that belongs to the same color range represented by a Magdam ellipse 5-step centered on a point (0.445, 0.408) on the xy chromaticity diagram, and emits red light The illuminating device according to claim 5, wherein a maximum value of the wavelength of the LED element is 575 nm to 780 nm.   The illumination device according to claim 5 or 6, wherein a color of the illumination light is variable between a color in the region and a white color.   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 8, further comprising:

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