JP7089684B2 - lighting equipment - Google Patents

Description

Patent Law Article 30 Paragraph 2 Applicable Issuer Name Toshiba Lighting & Technology Corporation Publication Name LED Lighting Catalog Vol. 13 Issue date October 30, 2015

An embodiment of the present invention relates to a lighting fixture that can obtain a light effect.

Conventionally, there is a lighting fixture in which a white light source that emits white light and a color light source that emits light of an arbitrary color are provided in the main body of the fixture, and these light sources are covered with a diffusion cover. In this luminaire, for example, when reading or working, the white light source is turned on, while when the atmosphere of the lighting space is changed, the output of the white light source is lowered or turned off to turn on the color light source.

In such a luminaire, the diffuser cover is configured to have uniform color and brightness as a whole. Therefore, if the color light source is turned on and the entire diffuser cover is colored other than white light, the atmosphere of the lighting space can be changed, but the function of the main lighting cannot be obtained, and reading or working is performed. May not be suitable for.

Japanese Unexamined Patent Publication No. 2013-58384

An object to be solved by the present invention is to provide a lighting fixture capable of obtaining a light effect while maintaining the function of the main lighting by white light.

The luminaire of the embodiment has an instrument body; a decorative frame having a frame-shaped plate having an opening in the center and arranged at the lower end of the instrument body; the instrument rather than the opening. It comprises a cover disposed inside the main body; the central region of the cover is dyed with color light different from white light, and white light is mainly emitted from the periphery of the opening. ..

According to the present invention, it can be expected that a light effect can be obtained while maintaining the function of the main lighting by white light.

It is sectional drawing of the luminaire which shows 1st Embodiment. It is a perspective view of the lighting fixture as above. It is a perspective view of the diffusion cover of the same as above. It is a perspective view of the lighting state of the lighting fixture as above. It is the xy chromaticity diagram of the XYZ color system at the time of lighting of the 1st main light source and the auxiliary light source of the same-mentioned lighting equipment. It is explanatory drawing of the lighting space of the subjective evaluation test. It is a graph which shows the result of the subjective evaluation test of the feeling of openness. It is a graph which shows the result of the subjective evaluation test of the feeling of relaxation. It is the xy chromaticity diagram of the XYZ color system at the time of lighting of the 2nd main light source and the auxiliary light source of the same-mentioned lighting equipment. It is a graph which shows the result of the subjective evaluation test of the feeling of openness. It is a graph which shows the result of the subjective evaluation test of the feeling of relaxation. Same as above It is a chromaticity diagram showing the relationship between the horizontal distance of the light emitting surface of the lighting equipment and the chromaticity. It is the bottom view of the lighting state of the lighting fixture as above. It is a chromaticity diagram which shows the relationship between the horizontal distance of the light emitting surface of the luminaire of the comparative example, and chromaticity. It is a bottom view of the lighting state of the lighting fixture of the comparative example. Same as above. It is a brightness distribution map of a lighting fixture. Same as above. It is a brightness distribution map when only the auxiliary light source of the lighting equipment is lit. It is a brightness distribution map of the lighting fixture of the comparative example. It is a luminance distribution map when only the auxiliary light source of the lighting fixture of the comparative example is lit. It is a bottom view of the lighting state of the lighting fixture of the comparative example. It is a graph which shows the result of the subjective evaluation test of emptiness. It is a graph which shows the result of the subjective evaluation test of preference. It is a graph which shows the result of the subjective evaluation test of the naturalness of a gradation. It is sectional drawing of the lighting equipment which shows the 2nd Embodiment. It is sectional drawing of the luminaire which shows the 3rd Embodiment.

Hereinafter, the first embodiment will be described with reference to FIGS. 1 to 23.

As shown in FIG. 4, the luminaire 10 is a ceiling-embedded luminaire that is embedded and installed in an embedded hole formed in the ceiling surface 11.

1 and 2 show the configuration of the lighting fixture 10. The lighting fixture 10 includes a fixture body 12, a diffusion cover 13, a decorative frame 14, a main light source 15, and an auxiliary light source 16.

Further, although not shown, the lighting fixture 10 is a mounting frame for attaching the fixture main body 12 to the ceiling structure, a main power supply device for supplying lighting power to the main light source 15, and an auxiliary power supply device for supplying lighting power to the auxiliary light source 16. , A control device for controlling a main power supply device and an auxiliary power supply device for controlling lighting / extinguishing and dimming of the main light source 15 and the auxiliary light source 16, respectively. The mounting frame is fixed to the upper part of the fixture body 12, and is attached to an embedded bolt hanging from the ceiling structure above the ceiling surface 11 to support the fixture body 12. Each power supply device is installed in this mounting frame.

The instrument body 12 is formed in a rectangular box shape, and has a top plate 20, side plates 21 facing each other in the first direction a along the top plate 20, and a second plate orthogonal to the first direction a. It has side plates 22 facing each other in the direction b of. A square irradiation opening 23 is formed on the lower surface of the instrument body 12. The main body frame 24 is used for assembling the top plate 20 and the side plates 21 and 22.

The inner surfaces of the top plate 20 and the side plates 21 and 22 are formed on a reflective surface 25 having a high reflectance, for example, a white surface.

Further, as shown in FIGS. 1 to 3, the diffusion cover 13 uses, for example, a milky white resin material having translucency and light diffusivity, and is integrally formed by, for example, a compressed air molding method. The diffusion cover 13 is curved in the bending direction (first direction a) connecting one opposite side and linearly formed in the width direction (second direction b) connecting the other opposite sides. The cover portion 13A, the side surface portions 13B provided on both side surfaces in the width direction (second direction b) orthogonal to the bending direction (first direction a) of the cover portion 13A, these cover portions 13A and the side surface portions. It has an edge portion 13C projecting outward from the lower end peripheral portion of 13B. The diffusion cover 13 is attached by fitting the peripheral edge portion 13C into the decorative frame 14.

The cover portion 13A of the diffusion cover 13 is a light emitting surface 13D that emits light by being irradiated with light from the main light source 15 and the auxiliary light source 16. Regarding the curved shape of the light emitting surface 13D, for example, the width A in the bending direction (first direction a) is 565 mm, the height B is 54.5 mm, and the radius of curvature R is 853 mm. The preferred range of these widths and heights is B / A = 0.07 to 0.12, more preferably 0.08 to 0.10, and the radius of curvature R is 800 to 900 mm.

The diffusion cover 13 attached to the decorative frame 14 is arranged on the instrument main body 12 so as to cover the irradiation opening 23, and is curved so as to be recessed toward the inside of the instrument main body 12.

The diffusion cover 13 (light emitting surface 13D) has a central region 13a in the bending direction and end regions 13b at both ends of the central region 13a, and is configured such that the top of the central region 13a coincides with the center of the instrument body 12. ing.

Further, the decorative frame 14 is formed in a quadrangular frame shape having a quadrangular opening 28 in the center, and is attached to the lower ends of the side plates 21 and 22 of the instrument main body 12. That is, the decorative frame 14 is provided around the irradiation opening 23 of the instrument main body 12.

The decorative frame 14 includes a decorative plate portion 29 provided in a quadrangular frame shape, and a mounting portion 30 that is raised from the upper surface of the decorative plate portion 29 and attached to the side plates 21 and 22.

On the outer peripheral side of the decorative plate portion 29, an edge portion 31 that covers the embedding hole of the ceiling surface 11 and faces the ceiling surface 11 is provided.

On the inner edge of the decorative plate portion 29 in the first direction a, facing portions 32 projecting toward the center of the decorative frame 14 are provided. The facing portion 32 faces the lower surface of the end region 13b of the diffusion cover 13 with a gap provided between the facing portion 32 and the lower surface of the end region 13b of the diffusion cover 13. The upper surface of the facing portion 32 is formed on a reflecting surface having a high reflectance such as a white surface.

Therefore, in the present embodiment, the decorative frame 14 is provided so that the width of the decorative plate portions 29 located on both sides of the first direction a is wider than the width of the decorative plate portions 29 located on both sides of the second direction b. Has been done. The facing portion 32 may also be provided on the inner edge of the decorative plate portion 29 in the second direction b, and the width of the entire circumference of the decorative plate portion 29 may be the same.

Further, the main light source 15 is provided at positions on both ends of the first direction a in the instrument main body 12, respectively, along the second direction b.

The main light source 15 emits white light. The white light is a white-based illumination light used for general illumination light, and includes illumination light such as daylight color, daylight white, and light bulb color. As the main light source 15, only the main light source 15 that emits white light having a predetermined correlated color temperature may be used, or the first main light source that emits white light having a correlated color temperature of 3500 K or more and 10,000 K or less, for example, 4000 K. 15a and a second main light source 15b that emits white light having a correlated color temperature of 1500 or more and less than 3500K, for example, 2700K may be provided.

A light emitting module 35 is used as the main light source 15. The light emitting module 35 includes a substrate 36 and a plurality of light emitting elements 37 that emit white light mounted on the substrate 36. The substrate 36 is formed in an elongated rectangular shape in the second direction b of the instrument main body 12, and a wiring pattern is formed on the surface thereof. The plurality of light emitting elements 37 are mounted on the wiring pattern of the substrate 36 in one row or a plurality of rows in the center of the width direction of the substrate 36 at predetermined intervals along the longitudinal direction of the substrate 36. For the light emitting element 37, for example, an SMD (Surface Mount Device) package type LED that emits white light is used. When the main light source 15 includes the first main light source 15a and the second main light source 15b, for example, the light emitting element 37 of the first main light source 15a and the light emitting element 37 of the second main light source 15b are arranged in the longitudinal direction of the substrate 36. Arrange in two rows along the direction, or arrange the light emitting element 37 of the first main light source 15a and the light emitting element 37 of the second main light source 15b alternately in one row along the longitudinal direction of the substrate 36. The light emitting element 37 of the first main light source 15a and the light emitting element 37 of the second main light source 15b are configured to be independently lit.

The main light source 15 using the light emitting element 37 is in a direction perpendicular to the center of the light emitting surface of the light emitting element 37 and is in a range of, for example, 120 ° with respect to the optical axis 38 which is the light distribution peak (the range of the broken line in FIG. 1). Is irradiated with white light.

The main light source 15 is attached to the inner surface of the side plate 21 in the first direction a of the instrument main body 12 by the attachment member 39. The main light source 15 is mounted by the mounting member 39 so that the optical axis 38 of the light emitting element 37 is tilted at a predetermined angle θ with respect to the lower surface of the instrument body 12 toward the central region 13a of the diffusion cover 13. ing. The predetermined angle θ is set to, for example, 45 ° so that the white light from the light emitting element 37 is emitted from the end region 13b of the diffusion cover 13 to the central region 13a.

Therefore, the main light source 15 is provided on both ends of the first direction a in the instrument main body 12, and faces each other from the end region 13b of the diffusion cover 13 to the central region 13a, and is opposed to the end of the diffusion cover 13. White light is emitted from the region 13b to the central region 13a. The luminous flux of one main light source 15 is, for example, about 3000 lm, and the total luminous flux of the two main light sources 15 included in the luminaire 10 is about 6000 lm.

The main light source 15 may be covered with a light diffusing light source cover in order to uniformly irradiate the end region 13b of the diffusing cover 13 with white light.

Further, the auxiliary light source 16 is provided at a central position in the instrument main body 12 along the second direction b.

The auxiliary light source 16 emits light having a light color different from that of white light (hereinafter referred to as color light). The color light includes, for example, the case of any one color such as blue or red, or the case of a plurality of colors such as red, green and blue.

A light emitting module 42 is used as the auxiliary light source 16. The light emitting module 42 includes a substrate 43 and a plurality of light emitting elements 44 that emit color light mounted on the substrate 43. The substrate 43 is formed in an elongated rectangular shape in the second direction b of the instrument main body 12, and a wiring pattern is formed on the surface thereof. The plurality of light emitting elements 44 are mounted on the wiring pattern of the substrate 43 in one row or a plurality of rows in the center of the width direction of the substrate 43 at predetermined intervals along the longitudinal direction of the substrate 43. For the light emitting element 44, for example, an SMD (Surface Mount Device) package type LED that emits color light is used.

The auxiliary light source 16 using the light emitting element 44 is in a direction perpendicular to the center of the light emitting surface of the light emitting element 44 and is in a range of, for example, 120 ° with respect to the optical axis 45 which is the light distribution peak (the range of the broken line in FIG. 1). Is irradiated with color light.

The auxiliary light source 16 is such that the optical axis 45 of the light emitting element 44 faces perpendicularly to the top of the central region 13a of the diffusion cover 13, that is, the optical axis 45 of the light emitting element 44 is perpendicular to the lower surface of the instrument body 12. It is attached to the center of the lower surface of the top plate 20 of the instrument body 12 so as to be.

Therefore, the auxiliary light source 16 is provided in the center of the instrument main body 12, faces the central region 13a of the diffusion cover 13, and irradiates the central region 13a of the diffusion cover 13 with color light. The luminous flux of the auxiliary light source 16 is, for example, about 270 lm when the light of the auxiliary light source 16 is blue light. In order for the luminaire 10 to maintain the function of the main lighting by the white light from the main light source 15 and to suppress the color change of the space due to the color light of the auxiliary light source 16, the luminous flux of the auxiliary light source 16 is one. It is smaller than the luminous flux of the main light source 15, and is preferably 1/5 or less, more preferably 1/7 or less.

The auxiliary light source 16 may be covered with a light diffusing light source cover in order to uniformly irradiate the central region 13a of the diffusing cover 13 with color light.

Then, the lighting fixture 10 supplies lighting power to the main light source 15 and the auxiliary light source 16 from the main power supply device and the auxiliary power supply device, respectively, and lights the main light source 15 and the auxiliary light source 16, respectively.

White light from the lit main light source 15 is emitted from the end region 13b of the diffusion cover 13 to the central region 13a, and color light from the lit auxiliary light source 16 is emitted to the central region 13a of the diffusion cover 13 to illuminate the diffusion cover 13. Shines.

In this case, as shown in FIG. 4, the end region 13b of the diffusion cover 13 glows white by white light, and the central region 13a of the diffusion cover 13 glows blue, for example, by color light.

The white light transmitted through the diffusion cover 13 is applied to the illumination space. In this case, the main light source 15 is provided on the end side of the fixture body 12, and the optical axis 38 of the main light source 15 is tilted toward the center of the luminaire 10, so that the embedded luminaire 10 is used. Even if there is, it is possible to irradiate a region with a wide light distribution angle with white light.

Since the color light emitted to the central region 13a of the diffuser cover 13 is a luminous flux to the extent that the central region 13a of the diffuser cover 13 is dyed with color light, it passes through the central region 13a of the diffuser cover 13 and irradiates the illumination space. The amount of color light produced is smaller than that of white light.

Therefore, the lighting space is mainly irradiated with white light, which provides a lighting environment suitable for reading or working, for example.

Further, the central region 13a of the diffusion cover 13 is irradiated with both the white light from the main light source 15 and the color light from the auxiliary light source 16, but the amount of white light is from the end region 13b of the diffusion cover 13. The amount of color light gradually decreases toward the central region 13a, and gradually increases from the periphery of the central region 13a of the diffusion cover 13 toward the center. Therefore, a gradation region in which the color gradually changes between white and blue is formed between the end region 13b and the center region 13a of the diffusion cover 13. Therefore, when looking up at the lighting fixture 10, the color of the diffusion cover 13 seems to change naturally through the gradation region, and the light effect can be enhanced.

Even if the color light of the auxiliary light source 16 is blue, the central region 13a of the diffusion cover 13 becomes a blue color close to sky blue by mixing the blue color and the white light. In this case, the person who looks up at the lighting fixture 10 is likely to be associated with the sky, and is likely to obtain a feeling of openness and relaxation.

Therefore, according to the lighting fixture 10, it is possible to obtain a light effect while maintaining the function of the main lighting by the white light.

Further, since the central region 13a of the diffusion cover 13 is curved so as to be recessed inside the instrument body 12, it is easy to obtain a sense of depth and openness as if the central region 13a of the diffusion cover 13 shining with color light is far away. , The light effect can be improved.

Moreover, regarding the curved shape of the light emitting surface 13D of the diffusion cover 13, when the width in the bending direction (first direction a) is A and the height is B, the preferable range is B / A = 0.07 to 0. 12, more preferably 0.08 to 0.10, the radius of curvature R is 800 to 900 mm, and the continuous curved shape within this range means that the incident angles of the light from the main light source 15 and the auxiliary light source 16 are respectively. Will change slowly, and a natural change in chromaticity and brightness on the light emitting surface 13D can be achieved, and a natural gradation effect without discomfort can be obtained.

Further, since the facing portion 32 of the decorative frame 14 faces the lower surface of the end region 13b of the diffusion cover 13 with a gap provided between the facing portion 32 and the lower surface of the end region 13b of the diffusion cover 13, the diffusion cover 13 A part of the light transmitted through the end region 13b of the above is reflected by the facing portion 32 and illuminates the end region 13b of the diffusion cover 13. Therefore, it is easy to see that the end region 13b of the diffusion cover 13 is separated from the facing portion 32 of the decorative frame 14, and there is an effect that it looks like indirect lighting.

Next, the chromaticity of the light emitting surface 13D of the diffusion cover 13 will be described.

When the first main light source 15a having a correlated color temperature of 4000 K of the main light source 15 and the auxiliary light source 16 of blue light are turned on, the light emitting surface 13D of the diffusion cover 13 exhibits a gradation from white to blue. The chromaticity distribution of the light emitting surface 13D in this case is shown in the xy chromaticity diagram of the XYZ color system of FIG.

At this time, the chromaticity of the point P1 having the lowest luminance (range of 400 to 12000 cd / m2, for example 4000 cd / m2) of the diffusion cover 13 is 0.25 ≦ on the xy chromaticity diagram of the XYZ color system. x ≦ 0.35 and 0.2 ≦ y ≦ 0.3. The point P1 having the lowest brightness is in the central region 13a of the diffusion cover 13 and on the end side in the second direction b (see FIG. 4). Further, the chromaticity of the point P2 having the maximum luminance (range of 8000 to 30000 cd / m2, for example, 16000 cd / m2) of the diffusion cover 13 is 0.4 ≦ x on the xy chromaticity diagram of the XYZ color system. ≦ 0.5 and 0.35 ≦ y ≦ 0.45. The highest brightness point P2 is in the center of the edge region 13b (see FIG. 4).

When the chromaticity distribution of the lighting fixture 10 installed on the ceiling of the lighting space shown in FIG. 6 is the chromaticity distribution shown in FIG. 5, the correlated color temperature in front of the resident D in the lighting space is 5500K. The illuminance in front of me was 250 lx. This environment is defined as Example 5500K. Further, conventionally, using a lighting fixture having uniform chromaticity and brightness of the light emitting surface, the correlated color temperature at the measurement point d in front of the resident D in the lighting space shown in FIG. 6 is 5500 K, and the illuminance in front of the eye is 250 lx. The environment is conventionally set to 5500K.

A subjective evaluation test was conducted by 15 men and women in their 20s and 40s to evaluate the feeling of openness and relaxation under the environment of Example 5500K and the conventional environment of 5500K, and the average value of the results of the subjective evaluation is shown in FIG. 7. And shown in FIG. As a result of the subjective evaluation, the environment of Example 5500K was significantly better than the conventional environment of 5500K at the significance level of 1% by t-test. One reason for this is that in the environment of Example 5500K, the feeling of being outdoors can be obtained.

Further, by turning on the second main light source 15b having a correlated color temperature of 2700K of the main light source 15 and the auxiliary light source 16 of blue light, the light emitting surface 13D exhibits a gradation from the light bulb color to bluish purple. The chromaticity distribution of the light emitting surface 13D in this case is shown in the xy chromaticity diagram of the XYZ color system of FIG.

At this time, the chromaticity of the point P3 having the lowest luminance (range of 400 to 12000 cd / m2, for example 4000 cd / m2) of the diffusion cover 13 is 0.25 ≦ x on the xy chromaticity diagram of the XYZ color system. ≤0.35 and 0.2≤y≤0.3. The point P3 having the lowest brightness is in the central region 13a of the diffusion cover 13 and on the end side in the second direction b (see FIG. 4). Further, the chromaticity of the point P4 having the maximum luminance (range of 8000 to 30000 cd / m2, for example, 16000 cd / m2) of the diffusion cover 13 is 0.4 ≦ x ≦ on the xy chromaticity diagram of the XYZ color system. It is 0.5 and 0.35 ≦ y ≦ 0.45. The highest luminance point P4 is in the center of the edge region 13b (see FIG. 4).

When the chromaticity distribution of the lighting fixture 10 installed on the ceiling of the lighting space shown in FIG. 6 is the chromaticity distribution shown in FIG. 6, the correlated color temperature in front of the resident D in the lighting space is 3500K. The illuminance in front of me was 200 lx. This environment is defined as Example 3500K. Further, conventionally, using a lighting fixture having uniform brightness and chromaticity of the light emitting surface, the correlated color temperature at the measurement point d in front of the resident D in the lighting space shown in FIG. 6 is 3500 K, and the illuminance in front of the eye is 200 lx. The environment is conventionally set to 3500K.

A subjective evaluation test was conducted by 15 men and women in their 20s and 40s to evaluate the feeling of openness and relaxation under the environment of Example 3500K and the conventional environment of 3500K, and the average value of the results of the subjective evaluation is shown in FIG. And shown in FIG. As a result of the subjective evaluation, the environment of Example 3500K was significantly better than the environment of the conventional 3500K at the significance level of 1% (openness) and 5% (relaxation), respectively, by the t-test. One reason for this is that in the environment of Example 3500K, the feeling of being outdoors can be obtained.

When the first main light source 15a having a correlated color temperature of 4000 K, the second main light source 15b having a correlated color temperature of 2700 K, and the auxiliary light source 16 for blue light are turned on, the minimum brightness of the diffusion cover 13 (range of 400 to 12000 cd). The chromaticity of the point at (for example, 4000 cd) is 0.2 ≦ x ≦ 0.35 and 0.2 ≦ y ≦ 0.3 on the xy chromaticity diagram of the XYZ color system. This lowest brightness point is in the central region 13a of the diffusion cover 13 and on the end side in the second direction b. Further, the chromaticity of the point where the maximum luminance (range of 8000 to 30000 cd, for example, 16000 cd) of the diffusion cover 13 is 0.3 ≦ x ≦ 0.5 on the xy chromaticity diagram of the XYZ color system. It is in 0.3 ≦ y ≦ 0.45. The highest brightness point is in the center of the edge region 13b. In this case as well, a feeling of openness and a feeling of relaxation can be obtained.

As described above, the luminaire 10 exhibiting the appearance of the light emitting surface 13D of the present embodiment is a luminaire having the same color temperature and illuminance of the light reaching the eyes of the resident D and having uniform brightness and chromaticity of the light emitting surface. In comparison, visual comfort such as a feeling of openness and a feeling of relaxation can be enhanced.

Further, when the main light source 15 includes a first main light source 15a having a correlated color temperature of 4000 K and a second main light source 15b having a correlated color temperature of 2700 K, the first main light source 15a is turned on in the morning and noon. By controlling the transition to Example 3500K in which the second main light source 15b is turned on from noon to evening in the above environment, the change in the color of the sky can be reproduced according to the time.

Moreover, by controlling the transition to the environment of Example 3500K in which the second main light source 15b is turned on from noon to evening, all day in the environment of Example 5500K in which only the first main light source 15a is turned on. Compared to spending time, the amount of light around 480 nm, which suppresses melatonin, which is a hormone secreted at night and promotes sleep, can be relatively reduced, and it can be expected to promote good quality sleep. As a result, a physiologically favorable environment can be realized for the resident D.

Further, in FIG. 12, the position of the light emitting surface 13D in the bending direction (first direction a) on the horizontal axis (horizontal distance L to the other end with respect to one end of the light emitting surface 13D), and the chromaticity x on the vertical axis. And a chromaticity diagram with chromaticity y is shown.

On the chromaticity diagram, the chromaticity x and the chromaticity y are curves that smoothly and continuously change from the end position to the center position of the light emitting surface 13D. In this case, as shown in FIG. 13, the chromaticity of the light emitting surface 13D changes naturally, and the light emitting surface 13D exhibits a natural gradation without a sense of discomfort.

FIG. 14 shows a chromaticity diagram of a comparative example. On the chromaticity diagram, the chromaticity x and the chromaticity y change rapidly between the edge region and the center region of the light emitting surface 13D, and are not curves that change smoothly and continuously. In this case, as shown in FIG. 15, it appears that the chromaticity of the light emitting surface 13D is clearly changed, and it is not possible to obtain a natural gradation without a sense of discomfort.

Next, the brightness of the light emitting surface 13D of the diffusion cover 13 will be described.

When the main light source 15 having a correlated color temperature of 4000 K and the auxiliary light source 16 for blue light are turned on, the light emitting surface 13D of the diffusion cover 13 exhibits a gradation from white to blue. The luminance distribution diagram of the light emitting surface 13D in this case is shown in FIG. In FIG. 16, the position of the light emitting surface 13D in the curved direction (first direction a) (horizontal distance L to the other end with respect to one end of the light emitting surface 13D) is shown on the horizontal axis, and the luminance is shown on the vertical axis. A white luminance distribution curve, a blue luminance distribution curve, and a white + blue luminance distribution curve are shown on the luminance distribution map, respectively.

The white + blue luminance distribution curve has the highest luminance region in the end region 13b of the light emitting surface 13D, the lowest luminance region in the central region 13a of the light emitting surface 13D, and the lowest luminance region to the lowest luminance region. A curve in which the brightness changes smoothly and continuously (a curve that is convex downward) is drawn. In this case, as shown in FIG. 13, the light emitting surface 13D naturally changes its brightness and exhibits a natural gradation without a sense of discomfort.

The minimum luminance in this case is about 25% of the maximum luminance. The minimum brightness is preferably 5% or more and 40% or less of the maximum brightness. If it is less than 5%, it is difficult to see the light emitting surface 13D in blue, and if it is more than 40%, the light emitting surface 13D looks blue.

FIG. 17 shows a luminance distribution map in which only the blue auxiliary light source 16 is turned on. The full width at half maximum (L / 4 to 3L / 4) at which the luminance value is half the maximum luminance is about 50% of the total width of the light emitting surface 13D.

On the other hand, FIGS. 18 and 19 show luminance distribution maps of comparative examples.

FIG. 18 is a luminance distribution diagram of a comparative example in which the luminance does not change smoothly and continuously from the highest luminance to the lowest luminance when the main light source 15 for white light and the auxiliary light source 16 for blue light are turned on. Is shown. In this case, the light emitting surface 13D exhibits an unnatural appearance in which white and blue are separated, as in FIG.

FIG. 19 shows a luminance distribution diagram of a comparative example in which the full width at half maximum of blue light is 24% of the full width of the light emitting surface 13D. In this case, as shown in FIG. 20, the light emitting surface 13D has a dark portion 47 between white and blue, and exhibits an unnatural appearance.

Therefore, in order for the chromaticity of the light emitting surface 13D to change naturally and to exhibit a natural gradation without a sense of discomfort, it is preferable that the half width of the auxiliary light source 16 is 25% or more.

The maximum luminance region in which the brightness is 50% or more of the maximum luminance is located in the end region 13b of the light emitting surface 13D of the diffusion cover 13, and the ratio of the maximum luminance region to the area of the light emitting surface 13D is in the range of 10 to 40%. be. This area is the apparent area when projected onto a plane (when looking up from directly below).

21 to 23 show a subjective evaluation test for evaluating the impression of a lighting fixture on 10 men and women in their 20s and 40s, and show the average value of the results of the subjective evaluation. From the left, the horizontal axis of FIGS. 21 to 23 shows the case where the light emitting surface 13D shown in FIG. 20 has a dark portion, the case of the present embodiment shown in FIG. 13, and the case where the boundary is clear on the light emitting surface 13D shown in FIG. be. FIG. 21 shows the emptiness, FIG. 22 shows the preference, and FIG. 23 shows the average value of the evaluation values of 10 persons for the naturalness of the gradation on the vertical axis.

As a result of the t-test, the evaluation of this embodiment was significantly good at the significance level of 1% in all the items.

Therefore, in the present embodiment, the chromaticity and the brightness of the light emitting surface 13D of the diffusion cover 13 change smoothly, so that a natural gradation effect without discomfort can be obtained.

When the auxiliary light source 16 is turned off and only the main light source 15 is turned on, the entire diffusion cover 13 can be illuminated by white light. It is also possible to turn off the main light source 15 and turn on only the auxiliary light source 16.

Further, when the auxiliary light source 16 is provided with a red, green, and blue light emitting element 44 and is capable of color illumination, for example, it irradiates color light corresponding to a change in the color of the sky at each time, for example, a blue sky during the day and an evening. May reproduce the sunset sky on the light emitting surface 13D.

Next, FIG. 24 shows a second embodiment. The same reference numerals are used for the same configurations as in the first embodiment, and the description of the configurations and the effects thereof will be omitted.

The upper reflective surface 25 of the instrument body 12 is curved or tilted. For example, the reflective surface 25 is curved or inclined by providing a protruding portion 20a on the lower surface of the top plate 20 that gradually protrudes downward from the end side of the top plate 20 in the first direction a toward the center side. ing.

Then, since the light directed from the main light source 15 toward the reflecting surface 25 of the top plate 20 above can be effectively reflected toward the diffusion cover 13, the efficiency of irradiating the lighting space from the lighting fixture 10 with light can be improved. ..

In the second embodiment as well, the decorative frame 14 may be provided with the same facing portion 32 as in the first embodiment.

Next, FIG. 25 shows a third embodiment. The same reference numerals are used for the same configurations as in each embodiment, and the description of the configurations and the effects thereof will be omitted.

The luminaire 10 includes a reflector 50 attached to the decorative frame 14 and arranged in the fixture body 12. The reflector 50 has a reflecting surface 51 facing the upper surface of the light emitting surface 13D of the diffusion cover 13. The reflective surface 51 is composed of a plurality of reflective surfaces 51a, 51b, 51c, 51d, and 51e that are bent corresponding to the curved shape of the light emitting surface 13D. The reflector 50 is provided with reflecting surfaces 51a to 51e along the first direction a, which is the bending direction of the diffusion cover 13, but the side surface of the second direction b may be open. Alternatively, it may be blocked by a side reflector.

The central reflective surface 51a is horizontal and an auxiliary light source 16 is attached. The reflective surfaces 51b and 51c on both sides of the central reflective surface 51a are provided in an inclined shape so that the end sides of the reflective surfaces 51b and 51c are lowered. The reflective surface 51c is inclined at an angle of, for example, 45 °, and the main light source 15 is attached. The reflective surfaces 51d and 51e form side surfaces and are attached to the decorative frame 14.

A main light source unit 53 provided with a main light source 15 is attached to the reflecting surface 51c of the reflector 50. The main light source unit 53 includes, in addition to the light emitting module 35 of the main light source 15, a mounting portion 54 for attaching the light emitting module 35 to the reflector 50, and a light source cover 55 for covering the light emitting module 35. The light source cover 55 has translucency and light diffusivity, and is formed in a curved shape with the center facing the light emitting element 37 of the light emitting module 35 as the top, and both end portions thereof of the light emitting element 37. It extends to the position.

An auxiliary light source unit 57 provided with an auxiliary light source 16 is attached to the reflecting surface 51a of the reflector 50. The auxiliary light source unit 57 includes, in addition to the light emitting module 42 of the auxiliary light source 16, a mounting portion 58 for attaching the light emitting module 42 to the reflector 50, and a light source cover 59 for covering the light emitting module 42. The light source cover 59 has translucency and light diffusivity, and is formed in a curved shape with the center facing the light emitting element 44 of the light emitting module 42 as the top, and both end portions thereof are formed of the light emitting element 37. It extends to the position. In the present embodiment, two auxiliary light source units 57 are used, and the directions of the two auxiliary light source units 57 corresponding to the bending direction (first direction a) of the light emitting surface 13D with respect to the reflecting surface 51a of the reflector 50. They are arranged side by side at predetermined intervals.

Further, the decorative frame 14 is pulled upward by a plurality of mounting springs 61 hooked on the instrument main body 12 and attached to the instrument main body 12.

Further, a main light source power supply device 62 and an auxiliary light source power supply device 63 are attached to the upper part of the instrument main body 12, and a control device is attached.

Then, in this luminaire 10, a part of the light emitted from the main light source 15 and the auxiliary light source 16 to the diffusion cover 13 is reflected toward the reflection surface 51, reflected by the reflection surface 51, and is reflected on the diffusion cover 13 again. Since it is irradiated, it is possible to improve the efficiency of light extraction that passes through the diffusion cover 13 and is taken out into the illumination space.

Further, the white light from the main light source 15 is reflected by the reflecting surface 51b toward the central region 13a of the light emitting surface 13D, and the color light from the auxiliary light source 16 is reflected by the reflecting surface 51b to the end of the light emitting surface 13D. Head towards region 13b. That is, white light and color light are directly or indirectly incident on the reflecting surface 51b between the main light source 15 and the auxiliary light source 16 and reflected. Therefore, the white light and color light reflected by the reflecting surface 51b are irradiated between the central region 13a and the end region 13b of the light emitting surface 13D, and the chromaticity of the light emitting surface 13D changes naturally, so that there is no sense of discomfort. It can exhibit a gradation.

Further, in each embodiment, the diffusion cover 13 may be formed in a spherical shape with the center as the top and curved toward the peripheral portion. In this case, the peripheral portion of the diffusion cover 13 may be either rectangular or circular. Further, the main light source 15 may be provided in the entire circumference of the side surface of the instrument main body 12 so as to irradiate the diffusion cover 13 with white light from the outer diameter side of the diffusion cover 13.

Further, the diffusion cover 13 may have a flat plate shape, or the central region 13a may be curved so as to protrude from the instrument main body 12.

Further, the projector may be arranged so as to face the central region 13a of the diffusion cover 13 of the instrument main body 12 so as to project an image such as a cloud onto the central region 13a of the diffusion cover 13. In this case, the auxiliary light source 16 may be provided together with the main light source 15 on the end side of the instrument main body 12 so as to irradiate the central region 13a of the diffusion cover 13 with color light.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

10 Lighting equipment
12 Instrument body
13 Diffusion cover
13a Central area
13b Edge area
14 Makeup frame
15 Main light source
15a First main light source
15b Second main light source
16 Auxiliary light source
23 Irradiation aperture
32 Opposing part
38 Optical axis

Claims (1)

With the instrument body;
With a decorative frame having a frame-shaped plate having an opening in the center and arranged at the lower end of the instrument body;
With a cover disposed inside the instrument body rather than the opening;
Equipped with
A lighting fixture characterized in that the central region of the cover is dyed with color light different from white light, and white light is mainly emitted from the periphery of the opening.

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