JP2013171687A - Lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device capable of improving work efficiency of a long-time work by reducing a sense of fatigue of a person.SOLUTION: A lighting device 100 emits, by emission of at least one LED element 6, illumination light of an illumination color within an area S1 surrounded by an isotemperature line W1 passing a point A (0.419, 0.343), an isanomal V1 with respect to a blackbody radiation locus V0, an isanomal V2 with respect to the blackbody radiation locus V0 passing a point B (0.418, 0.390), an isotemperature line W2 passing a point C (0.397, 0.370), and a straight line connecting the point B and the point C, on an xy chromaticity diagram defined by the International Commission on Illumination.

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

  However, the conventional lighting device does not contribute to the creation of an environment that can reduce human fatigue, and the work efficiency of the work performed by the user cannot be increased under any lighting. There was a problem with low efficiency.

  This invention is made | formed in view of said point, and it aims at providing the illuminating device which can improve a human work efficiency.

  In order to solve the above problems, the lighting device of the present invention passes through point A (0.419, 0.343) on the xy chromaticity diagram defined by the International Lighting Commission by the light emission of at least one LED element. An equal deviation line for the isochromatic temperature line and the black body radiation locus, an equal deviation line for the black body radiation locus passing through the point B (0.418, 0.390), and a point C (0.397, 0.370). The illumination light of the illumination color in the area | region enclosed by the color-matching temperature line which passes and the straight line which connects the point B and the point C is radiate | emitted.

  According to this configuration, illumination light of a color between yellow-red and yellowish white or between orange-pink and light pink is emitted by the light emission of the LED element. As a result, the sympathetic nervous system is prevented from advancing due to work loads such as work and housework, so that fatigue during work is reduced and work efficiency is improved.

  In the illumination device having the above-described configuration, the illumination color is a color belonging to a color matching range represented by a Magdam ellipse 5-step centered on a point (0.416, 0.377) 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 (0.416, 0.377) 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 a color matching temperature line passing through the point A (0.419, 0.343) and a black body radiation locus on the xy chromaticity diagram, and a point B (0 .418, 0.390) is surrounded by an equal deviation line with respect to the black body radiation locus, a color matching temperature line passing through point C (0.397, 0.370), 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, the work efficiency of the work performed by the user can be improved. 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 has an equal deviation line V1 with respect to the color matching temperature line W1 passing through the point A (0.419, 0.343) and the black body radiation locus V0 on the xy chromaticity diagram, and the point B (0.418, 0). .390) is surrounded by a uniform deviation line V2 with respect to the blackbody radiation locus V0, a color matching temperature line W2 passing through the point C (0.397, 0.370), and a straight line connecting the point B and the point C. Illumination light in the region S1 is emitted.

  A point A has a correlated color temperature of 2750 K, and indicates a point having a deviation Δuv = −0.025 with respect to the blackbody radiation locus V0. Point B represents a point having a correlated color temperature of 3250K and a deviation Δuv = −0.003 with respect to the blackbody radiation locus V0. Point C indicates a point where the correlated color temperature is 3500 K and the deviation Δuv = −0.008 with respect to the blackbody radiation locus V0. Note that the chromaticity coordinates of the intersection D between the equal color temperature line W1 and the equal deviation line V2 are (0.453, 0.401), and the chromaticity of the intersection E between the equal color temperature line W2 and the equal deviation line V1. The coordinates are (0.383, 0.329). Accordingly, the region S1 is surrounded by points A, E, C, B, and D in the clockwise direction in the drawing.

  The region S1 has a color between yellow-red and yellowish white, or a color between orange pink and light pink. For this reason, the illuminating device 100 emits the illumination light of the illumination color of the color between yellow red and yellowish white, or the color between orange pink and light pink. As a result, the fatigue of the sympathetic nervous system due to work loads such as business and housework is suppressed and the feeling of fatigue is reduced. As a result, the lighting device 100 can suppress a reduction in work efficiency during long-time work, and can improve work efficiency.

  “Yellow red”, “yellowish white”, “orange pink” 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 (0.419, 0.343) on the xy chromaticity diagram determined by the International Lighting Commission and An equal deviation line V1 for the black body radiation locus V0, an equal deviation line V2 for the black body radiation locus V0 passing through the point B (0.418, 0.390), and a point C (0.397, 0.370) are passed. The illumination light of the illumination color in the area S1 surrounded by the color matching temperature line W2 and the straight line connecting the point B and the point C is emitted.

  For this reason, the work efficiency of the work performed by the user can be improved.

  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 D (0.453, 0.401) (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 (0.446, 0.388) (point p2 in FIG. 6) on the color matching temperature line W1 in the region S1.

  The illuminating device 1 of Example 3 emits the illumination light of the illumination color of the point A (0.419, 0.343) (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 B (0.418, 0.390) (point p4 in FIG. 6) in the region S1.

  The illuminating device 1 of Example 5 emits the illumination light of the illumination color of the point F (0.416, 0.377) (point p5 in FIG. 6) inside the region S1.

  The illuminating device 1 of Example 6 emits illumination light of the illumination color of the point (0.397, 0.336) (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 C (0.397, 0.370) (point p7 in FIG. 6) in the region S1.

  The illuminating device 1 of Example 8 emits the illumination light of the illumination color of the point E (0.383, 0.329) (point p8 in FIG. 6) in the region S1.

[Comparative Example 1]
The lighting device 1 of Comparative Example 1 is closer to the blackbody radiation locus V0 than the equal deviation line V2 and has a correlated color temperature lower than the color matching temperature line W1 (0.477, 0.414) (point q1 in FIG. 6). The illumination light of the illumination color is emitted.

[Comparative Example 2]
The illumination device 1 of the comparative example 2 emits illumination light of the illumination color at the points (0.471, 0.404) (point q2 in FIG. 6) whose correlated color temperature is lower than the point D.

[Comparative Example 3]
The illuminating device 1 of Comparative Example 3 emits illumination light having the illumination color of the points (0.462, 0.390) (point q3 in FIG. 6) whose correlated color temperature is lower than the points of Example 2.

[Comparative Example 4]
The illumination device 1 of the comparative example 4 emits illumination light of the illumination color at the point (0.436, 0.347) (point q4 in FIG. 6) whose correlated color temperature is lower than the point A.

[Comparative Example 5]
The lighting device 1 of the comparative example 5 is far from the black body radiation locus V0 than the equal deviation line V1, and has a correlated color temperature lower than the color matching temperature line W1 (0.429, 0.336) (point q5 in FIG. 6). The illumination light of the illumination color is emitted.

[Comparative Example 6]
The illumination device 1 of Comparative Example 6 illuminates the illumination color at the point (0.459, 0.410) (point q6 in FIG. 6) on the color matching temperature line W1 that is closer to the blackbody radiation locus V0 than the equal deviation line V2. Emits light.

[Comparative Example 7]
The illuminating device 1 of the comparative example 7 has the illumination color of the point (0.413, 0.333) (point q7 in FIG. 6) on the color matching temperature line W1 farther from the black body radiation locus V0 than the equal deviation line V1. Illumination light is emitted.

[Comparative Example 8]
The illumination device 1 of the comparative example 8 emits illumination light of the illumination color of the point (0.420, 0.398) (point q8 in FIG. 6) closer to the black body radiation locus V0 than the point B.

[Comparative Example 9]
The illuminating device 1 of the comparative example 9 emits the illumination light of the illumination color of the point (0.392, 0.325) (point q9 in FIG. 6) farther from the black body radiation locus V0 than the point of the sixth embodiment.

[Comparative Example 10]
The illumination device 1 of Comparative Example 10 illuminates the illumination color at the point (0.405, 0.391) (point q10 in FIG. 6) on the color matching temperature line W2 that is closer to the blackbody radiation locus V0 than the equal deviation line V2. Emits light.

[Comparative Example 11]
The illumination device 1 of the comparative example 11 emits illumination light of the illumination color at the intersection (0.402, 0.383) (point q11 in FIG. 6) between the equal deviation line V2 and the equal color temperature line W2.

[Comparative Example 12]
The illuminating device 1 of the comparative example 12 has the illumination color of the point (0.379, 0.319) (point q12 in FIG. 6) on the color matching temperature line W2 farther from the black body radiation locus V0 than the equal deviation line V1. Illumination light is emitted.

[Comparative Example 13]
The lighting device 1 of Comparative Example 13 is closer to the blackbody radiation locus V0 than the equal deviation line V2, and has a higher correlated color temperature (0.395, 0.385) than the uniform color temperature line W2 (point q13 in FIG. 6). The illumination light of the illumination color is emitted.

[Comparative Example 14]
The illumination device 1 of the comparative example 14 emits illumination light of the illumination color at the point (0.392, 0.378) (point q14 in FIG. 6) on the equal deviation line V2 having a correlated color temperature higher than the color matching temperature line W2. Exit.

[Comparative Example 15]
The illumination device 1 of the comparative example 15 emits illumination light of the illumination color at the point (0.389, 0.367) (point q15 in FIG. 6) having a correlated color temperature higher than that of the point C.

[Comparative Example 16]
The illumination device 1 of Comparative Example 16 emits illumination light of the illumination color of the point (0.375, 0.325) (point q16 in FIG. 6) on the equal deviation line V1 having a correlated color temperature higher than that of the point E.

[Comparative Example 17]
The illumination device 1 of Comparative Example 17 is far from the blackbody radiation locus V0 than the equal deviation line V1, and has a correlated color temperature higher than the color matching temperature line W2 (0.372, 0.315) (point q17 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 experiment, the work efficiency was evaluated with a total of 32 subjects, 16 healthy men and 16 males and 16 females aged 16 or less. Specifically, the subjects were put on standby for each room, and the environmental conditions of all subjects were the same, and the subjectivity and work efficiency after irradiating the illumination light of each illumination color for 30 minutes during the work time were evaluated. In each illumination color, an experiment corresponding to 85 W (about 500 lx) and 100 W (about 600 lx) was performed. And it compared with the evaluation at the time of irradiating each day white by 85W equivalency (about 600 lx).

  As a subjective evaluation regarding work, a question item of “motivation” was provided, and the subjectivity after 30 minutes of work was evaluated by VAS (Visual Analogue Scale). 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. As the work load, “Uchida-Kraepelin Test (registered trademark)” of the Japan Institute of Psychiatric Technology was used. 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. In addition, the work efficiency was measured by the total amount of calculations for 30 minutes.

  Tables 1 and 2 show the results of the above experiments for 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. A t-test was used as a test method, and the significance level was 5%, and “improvement” or “deterioration” was evaluated. In addition, the significance probability of less than 10% was evaluated as “increase tendency” or “deterioration tendency” with a difference.

  According to the result of the above experiment, in the case of the illumination color in the area S1, 85 W, that is, when the white energy is equivalent to the light energy output from the light source, the motivation and work efficiency are equivalent to the day white. In the case of equivalent to 100 W, that is, when the daytime white color is equivalent to the illuminance on the desk, the motivation and work efficiency tend to be improved or improved as compared with the daytime white color.

  In the case of an illumination color outside the range of the area S1, motivation and work efficiency are not improved as compared with daytime white at 85W and 100W. In general, the setting of lighting conditions during work is based on the illuminance on the desk rather than the light energy output from the light source (see, for example, JIS-Z-8516). By illuminating with the illumination color, it is expected that the willingness to work is improved and the work efficiency is improved.

  In particular, according to Example 5, since the work efficiency is significantly improved, it can be greatly expected to improve the work efficiency. It is generally known that the willingness of motivation decreases as fatigue increases, and the improvement in motivation in this experiment is to suppress the progression of the sympathetic nervous system due to workload. This is thought to be due to the reduced feeling of fatigue at the time.

  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 area S1 is a color matching range S2 (FIG. 5) represented by a MacAdam ellipse 5-step centered at a point F (0.416, 0.377) in FIG. 5 (point p5 in FIG. 6). 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 (0.419, 0.343) 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 deviation line with respect to the black body radiation locus passing through the point B (0.418, 0.390), the equal color temperature line passing through the point C (0.397, 0.370), 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 (0.416, 0.377) on an xy chromaticity diagram. The lighting device described.   2. The illumination color according to claim 1, wherein the illumination color is a color to which a uniform color range represented by a Magdam ellipse 1-step centered on a point (0.416, 0.377) on an xy chromaticity diagram belongs. 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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