JP3076389B2 - lighting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting apparatus using a plurality of light sources.

[0002]

2. Description of the Related Art When performing illumination to obtain white using a light source having light colors of red, green, and blue (hereinafter, referred to as R, G, and B), it is important to eliminate unevenness of the light source in the lighting fixture. Become. FIG. 16 shows a cross section of a conventional luminaire using R, G, and B light sources.
A light source 2a, 2b, 2c of a straight tube whose emission color is, for example, R, G, B, is mounted in parallel inside, and a diffusion plate for diffusing light is provided below these light sources 2a, 2b, 2c. In this luminaire, the central portion is white, but the color of the diffuser plate 3 is closer to the light sources at both ends at both ends, the red light source 2a side has a reddish color, and the diffuser plate 3 has a reddish color. The light source 2c has a bluish color, and a color change of R → white → B occurs as a whole.

[0003] Normally, when looking at a lighting fixture, a person tends to look at both ends and evaluate color unevenness of the lighting fixture based on the both ends. At this time, if the colors at both ends are different as described above, there is a drawback that a sense of incongruity is given and the user becomes uncomfortable. Therefore, as a lighting fixture with enhanced color mixing, a lighting fixture in which small light sources (in the figure, R, G, and B indicate respective light sources and their emission colors) in a matrix is provided as shown in FIG. Have been.

[0004]

The lighting apparatus shown in FIG. 17 is excellent in that the color mixing is enhanced. However, in this conventional example, the light source needs to be small, and it is suitable for applications requiring a large amount of light. However, there are drawbacks such as the wiring is complicated because the light source is unsuitable and a large number of light sources are required.

The present invention has been made in view of the above-mentioned drawbacks, and an object of the present invention is to provide a lighting apparatus having excellent color mixing.

[0006]

In order to achieve the above-mentioned object, according to the first aspect of the present invention, a plurality of light sources of a plurality of light colors are arranged so as to be uniformly distributed so that the light colors of the respective light sources are mixed. In a lighting fixture, light sources are arranged such that the light color arrangement of each light source is symmetric. In the invention of claim 2, light sources of the same color as the light sources located at both ends of the array are arranged at the center of the array, and in the invention of claim 3, the light sources of the same color are arranged so as not to be adjacent to each other.

[0007]

According to the present invention, since the light sources are arranged so that the light color arrangement of the light sources is symmetrical, the light reflection of each light source is symmetrical with respect to the center, and the color mixing property is improved. improves. Therefore, a lighting device without color unevenness can be realized. By arranging light sources of the same color as the light sources located at both ends of the array at the center of the array, even if light from the light sources at both ends is difficult to reach, color unevenness occurs at the center due to the presence of the light source of the same color. Lighting fixtures which are less likely to occur and have more uniform color can be obtained.

According to the third aspect of the invention, since the light sources of the same color are arranged so as not to be adjacent to each other, the light amount of the same light color is not locally increased and the light color arrangement is not asymmetric. Lighting equipment with no unevenness can be realized

[0009]

The present invention will be described below with reference to examples. (Embodiment 1) FIG. 1 is a cross-sectional view of a lighting fixture of the present embodiment. In this lighting fixture, a straight tubular light source 4 having a different light color.
a, 4b, 4c, 3a, 4b, 4c, respectively, and 4a, 4b, 4c, 4a,
4c, 4b, 4a, that is, they are mounted in parallel so that the arrangement of light colors is symmetrical, and a light transmitting panel or a diffusion plate 3 for diffusing light is mounted on the opening surface of the lighting fixture body 1. I have. The diffusion plate 3 may be removed as needed.

The light colors of the light sources 4a, 4b and 4c are R, G and B, respectively. Of course, any combination of arrangements such as B, R, and G may be used, and any combination of light colors other than the combination of R, G, and B may be used. In particular, it is preferable that the color becomes white when mixed. Further, a light source in which the light source itself emits each light color or a light source in which a colored filter is attached to a white light source may be used as the light source. Further, a plurality of lighting fixtures may be combined so that the light sources of the lighting fixtures are symmetrically arranged in parallel.

Next, the reason for the above arrangement of this embodiment will be described. That is, since the light colors of the light sources at both ends of the diffuser plate 3 need to be the same color, in the embodiment, the R light sources 4a are arranged at both ends to have the same color. Here, the light source 4a is set to 2
Since the other light sources 4b and 4c are used as two light sources respectively, for example, the arrangement of four central light sources such as 4a, 4b, 4b, 4c, 4c, and 4a is such that light sources of the same color are adjacent to each other. Is substantially an array of 4a, 4b, 4c, and 4a, and the light colors between the light sources 4a and 4b and between the light sources 4c and 4a are different, so that the light colors are not symmetrical and give a sense of incongruity. Light sources of the same color are not adjacent to each other.

Further, 4a, 4b, 4c, 4b, 4c,
When the light sources are arranged as in 4a, the light color becomes asymmetric at the end, so that there is a sense of incongruity, and it is necessary to be symmetrical. Therefore, if the light sources are arranged symmetrically, the light at both ends is unlikely to reach the center, and the light color of the lighting fixture becomes uneven. Therefore, light sources having the light colors of the light sources at both ends are added to the center.

For the above reasons, the arrangement is made as shown in FIG. 1 using seven light sources. Here, the above-mentioned reason was verified by the following calculation. First, consider one section of the lighting fixture body. The light source is a linear light source and emits light uniformly in each direction without considering thickness and width.

Considering only the primary reflection, the reflectance is set to 1
Think. Light sources are arranged at equal intervals. The calculation of color and illuminance considers only the point directly below the light source. As evaluation methods, differences ΔX and ΔY from the average of the X and Y illuminances at all points are considered.

The above points are assumed as conditions for the calculation, and the following calculation is performed based on this assumption. First, FIG.
, The point 1 is from the light source A to A ₁ , A ₂ , A ₃ , the light source B
, B ₁ , B ₂ , B ₃ , and C ₁ , C ₂ , C ₃ from the light source C, and chromaticity coordinates x, y,
And the illuminance.

The illuminance (relative value) given to the light sources i to j is obtained by the following equation.

[0017]

(Equation 1)

The same applies when n of the light source is larger than 3. Here, the light color is G, x is 0.331, and y is 0.53.
4. A light source 4a having a light flux (lm) of 3670 and a light color of B
Where x is 0.157, y is 0.082, luminous flux (lm) is 1100, light source is R, x is 0.577,
Assuming a light source 4c with y of 0.334 and a light flux (lm) of 2550, an arrangement of 4a, 4b, 4c, 4a, 4b, 4c and an arrangement of 4a, 4b, 4c, 4c, 4b, 4a When the differences Δx and Δy from the averages of the x and y illuminances are obtained respectively in b and 4a, 4b, 4a, 4c, 4b and 4a,
As shown in FIG. 3 and FIG.

It can be seen from FIGS. 3 and 4 that Δx and Δy are much smaller (about 1/10) in the symmetric arrangement B and C than in the asymmetric arrangement A. It is considered that the human eyes perceive the color irregularities in the absolute values of Δx and Δy, and it can be said that the arrangement b and c having the small absolute values are the lighting fixtures with less color irregularities. In arrangements B and C, the arrangement C in which one light source having the same light color as the light sources at both ends is arranged at the center has a Δy of about 、, which is excellent.

Therefore, the arrangement of the light sources of this embodiment shown in FIG. 1 can be said to be an arrangement for realizing a lighting fixture which does not cause color unevenness. (Embodiment 2) FIG. 5 shows an arrangement of light sources according to this embodiment, in which light sources 4a, 4b, R, G,
The light sources 4a are arranged symmetrically so that light sources of the same color are not adjacent to each other using a total of thirteen of four, four, and four light sources 4a, and the same light source 4a as the light sources 4a arranged at both ends is disposed at the center. doing.

Thus, in this embodiment, as in the case of the first embodiment, a lighting fixture with less color unevenness can be realized. Light source 4
The colors used in the combination of the arrangements a, 4b, and 4c may be any colors as in the first embodiment. (Embodiment 3) FIG. 6 shows an arrangement of light sources according to the present embodiment. In this embodiment, three, two, two and two light sources of four colors of light sources 4a, 4b, 4c and 4d are used. Used in a combination of
Light sources of the same color are not adjacent to each other and are arranged symmetrically, and the same light sources 4a as the light sources 4a at both ends are arranged at the center.

The combination of the four colors is, for example, R, G, B and yellow (Y), and the respective light colors are the light sources 4a to 4d.
May be used. Of course, other color combinations may be used. (Embodiment 4) FIG. 7 shows the arrangement of the light sources of the present embodiment. In this embodiment, another light source 4d is added to the arrangement of the light sources of the first embodiment. Light source 4
Lights are turned on when a to 4c are not turned on, and otherwise turned off (or turned on with a light amount that does not affect the light), and one at each end is added as shown in the figure.

Of course, the arrangement position may be any position, and the number of light sources to be added and the light color are not particularly limited .

(Embodiment 5) FIG. 8 shows an arrangement of light sources according to the present embodiment . In this embodiment, the arrangement of the first embodiment is used as a basic arrangement, and another light source is provided below (or above) the arrangement position. 4d is additionally arranged as shown.

The light source 4d is turned on when the other light sources 4a to 4c are not turned on, and is turned off (or turned on with a light amount having no influence) in other cases.
Although the number is used, the number is not particularly limited to the embodiment, and the arrangement position may be any position below or above the basic arrangement, and the light color of the added light source is not particularly limited.

[0026]

Embodiment 6 In this embodiment, as shown in FIG. 9 , point light sources 4a and 4a having different light colors are used .
A plurality of 4b and 4c are respectively arranged in a horizontal line, and the vertical direction is arranged in the same combination of light colors as the arrangement of the first embodiment to form a lattice. (Embodiment 7) This embodiment is arranged radially from the center as shown in the conceptual diagram of FIG. 10, and the arrangement of the light sources in each direction is the same as the basic arrangement of the first embodiment. It is not particularly limited to the example.

[0028]

Embodiment 8 In this embodiment , as shown in FIG. 11 , a circular or square point light source or an annular light source 6a is provided at the center so that the light color arrangement of the light sources on the radius is the same as that of the first embodiment . And the light source 6a
And a light source 6c on the outer periphery of the light source 6b.
The light source 6a is arranged on the outer periphery of the light source 6c, the light source 6c is further arranged on the outer periphery of the light source 6a, the light source 6b is arranged on the outer periphery of the light source 6c, and the light source 6a is arranged on the outer periphery of the light source 6b.

Ninth Embodiment In the sixth embodiment , the light sources of the same color are arranged in a horizontal line . In the present embodiment, as shown in FIG. 12 , the light sources 5a, 5b, 5c are arranged.

[0031]

According to the present invention, since the light sources are arranged so that the light color arrangement is symmetrical, the light reflection of each light source is symmetrical with respect to the center, so that the color mixing is improved. Since there is no color unevenness and a line light source having a large amount of light can be used as a light source, there is an effect that a lighting device having a large amount of light can be realized.

Further, according to the present invention, the light sources of the same color as the light sources located at both ends of the array are arranged at the center of the array, so that the light source of the same color can hardly reach the light sources at both ends. Is present in the central portion, so that color unevenness is less likely to be generated in the central portion, and there is an effect that a lighting device with less color unevenness can be obtained. Similarly, in the invention according to claim 3, light sources of the same color are not adjacent to each other. Therefore, the amount of light of the same light color does not locally increase and become asymmetric, and there is an effect that a lighting fixture without color unevenness can be realized.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating the principle of the first embodiment of the present invention.

FIG. 3 is an explanatory diagram by calculation of principle verification according to the first embodiment of the present invention.

FIG. 4 is an explanatory diagram based on calculation of principle verification according to the first embodiment of the present invention.

FIG. 5 is a sectional view of a schematic configuration according to a second embodiment of the present invention.

FIG. 6 is a sectional view of a schematic configuration according to a third embodiment of the present invention.

FIG. 7 is a sectional view of a schematic configuration according to a fourth embodiment of the present invention.

FIG. 8 is a sectional view of a schematic configuration of a fifth embodiment of the present invention.

FIG. 9 is a plan view showing a part of the schematic configuration of a sixth embodiment of the present invention.
FIG .

FIG. 10 is an explanatory view showing the arrangement of conceptual light sources according to a seventh embodiment of the present invention.

FIG. 11 is a plan view of a schematic configuration of Embodiment 8 of the present invention.

FIG. 12 is a plan view of a schematic configuration of a ninth embodiment of the present invention.

FIG. 13 is an explanatory diagram of a conventional example.

FIG. 14 is an explanatory diagram of another conventional example.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-158608 (JP, A) JP-A-4-52306 (JP, U) JP-A-61-282591 (JP, U) (58) Investigation Field (Int.Cl. ⁷ , DB name) F21S 8/04 F21S 4/00

Claims (3)

(57) [Claims] 1. A lighting apparatus in which light sources of a plurality of light colors are uniformly distributed and arranged so that light colors of respective light sources are mixed.
A lighting fixture, wherein each light source is arranged so that the light color arrangement of the light sources is symmetric. 2. The arrangement of claim 1, wherein light sources of the same color as light sources located at both ends of said array are arranged at the center of the array.
The lighting fixture as described. 3. The lighting apparatus according to claim 1, wherein light sources of the same color are arranged so as not to be adjacent to each other.