JPH11111024A - Indoor luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an indoor luminaire, capable of making a recycled paper, which is often used in view of global environment protection, look white instead of yellow, increasing the clearness of black letters printed on the paper and eliminating uncomfortable glare. SOLUTION: An indoor luminaire has a 27 W compact fluorescent lamp 2 to emit downward direction light 8, a reflecting mirror 3 and a 40 W ring fluorescent lamp 4 to emit light 9 therearound, the direction light 8 having a color temperature of 6000 K or higher and the light 9 therearound having a color temperature of 3800 K or lower. Illumination E1 right thereunder or therenear by the direction light is 500 (1x) or larger and illumination E2 therearound is E1/10<=E2<=E1/4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an indoor lighting apparatus, and more particularly to an indoor lighting apparatus which enhances the whiteness of yellowish newspaper or recycled paper to make contrast with characters clear, and does not cause discomfort glare. The present invention relates to an indoor lighting device having two types of color temperatures and light distributions that do not give a sense of discomfort of light colors as the lighting environment.

[0002]

2. Description of the Related Art In recent years, recycled paper is often used for newspapers, magazines, and copy paper from the viewpoint of global environmental protection. Conventionally, high-quality paper has been used for magazines and copies, and its color is a so-called white color. However, the color of recycled paper, which has been frequently used recently, is yellowish. For this reason, paper using recycled paper with a yellow tint, such as newspapers and magazines, looks white, and the printed black characters look clearly as if they were printed on white paper, such as high-quality paper. The realization of the means was desired. In particular, the needs of elderly people whose vision has declined due to the entry into the elderly society are increasing.

In this regard, it has been empirically known that paper appears whitish when illuminated with a light source having a high color temperature. It has also been known that a light source having a high color temperature is susceptible to unpleasant glare (unpleasant glare), and in particular, it is harmful to the elderly.
No. p24-p31).

Accordingly, in order to meet the above-mentioned needs, it is natural that sufficient illuminance for reading newspapers or the like can be obtained. In addition, there is a need for a means that does not cause unpleasant glare and provides a lighting environment in which the interior of the living space is light-colored and comfortable.

FIG. 4 shows a sectional view of a lighting fixture for a house, which is conceptually shown as a first example of the prior art. That is, this luminaire includes a directional light distribution reflective halogen bulb 10 that illuminates the vicinity immediately below, and a diffused light distribution fluorescent lamp 1 that illuminates the periphery.
1, 12 and the reflective halogen bulb 10
Is 3000 [K] and the color temperature of the fluorescent lamps 11 and 12 is 5000 [K] (for example, catalogs of Matsushita Electric Works Co., Ltd. '96 -'97, d.
7).

In this first conventional example, the area immediately below is illuminated by a reflective halogen bulb 10 having a low color temperature. Although this light bulb is classified as a white light source, the actual light color is yellowish-orange, and has no effect of making yellowish paper look white.

A fluorescent lamp 11 having a color temperature of 5000 [K],
Numeral 12 is for illuminating the periphery, and the area immediately below is not the main object of illumination, and is configured to easily give discomfort glare to elderly people. In other words, the first conventional example is provided with a light source and a light distribution having two kinds of color temperatures, but it is necessary to appropriately switch the lighting circuit between the halogen bulb 10 and the fluorescent lamps 11 and 12 in addition to obtaining a warm atmosphere. There is an aim as an effect that the atmosphere can be changed by the change of the light color due to.

As a second example of the prior art, Patent Registration No. 25
No. 29,277. It is composed of a light source that emits highly directional light and a light source that emits diffuse light, and the color temperature K1 of the light source that emits light with high directivity and the color temperature K2 of the light source that emits diffuse light are represented by K1. <K2, color temperature K1 is 5500 [K] or less, K2 is 6000
[K] or more. The effect of the second conventional example is that a comfortable light environment close to nature is obtained outdoors, and there is no effect similar to the first conventional example in that yellowish paper looks white. .

[0009] Each of the above conventional examples has two kinds of color temperature and light distribution, but the color temperature K of the light having the directional light distribution.
1 is lower than the color temperature K2 of the light to the surroundings, that is, K1 <K2, which is opposite to that of the present invention, and the effect is that "yellowish paper such as newsprint or recycled paper is" visibly white "".
No effect.

[0010]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and enhances the clarity of printed characters by making a yellowish paper surface appear white, and also reads characters in newspapers and the like. It is an object of the present invention to provide a lighting fixture that can provide an illuminance necessary for the lighting, has no discomfort glare, and can provide a lighting environment of a light color without a sense of incongruity.

[0011]

According to a first aspect of the present invention, there is provided an indoor lighting apparatus comprising: means for radiating substantially directional light downward; and means for radiating light to the periphery. The temperature K1 and the color temperature K2 of light radiated to the surroundings are set so that K1> K2.

The configuration of the indoor lighting apparatus is as described above, and the color temperature K1 of the directional light and the color temperature K2 of the light radiated to the periphery are K1> K2, so that the yellowish paper is obtained. Appear white and provide an illumination environment with less discomfort glare.

According to a second aspect of the invention, in addition to the configuration of the first aspect, the color temperature K1 of the substantially directional light is set to 5000 K or more.
The color temperature K2 of the light to the surroundings is set to 3800 [K] or less.

Further, by setting the color temperature K1 of the substantially directional light and the color temperature K2 of the light to the periphery as described above,
The yellowish paper looks whiter and provides a lighting environment with even less discomfort glare.

According to a third aspect of the invention, in addition to the configuration of the second aspect of the invention, the illuminance E1 in the vicinity immediately below by the directional light is set to 500 [l
x] or more, and the surrounding illuminance E2 is E1 / 10 ≦
E2 ≦ E1 / 4.

By setting the illuminance as described above, in addition to the effect of the second invention, the illuminance for reading or the like can be secured, and an illumination environment with a sense of strangeness as a light color can be obtained.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION As an example of an application, indoor lighting fixtures are used in a living room or a Japanese-style room of a house and are mounted on a ceiling, and it is assumed that newspapers and magazines are viewed immediately below the lighting fixtures. A means for radiating light having directivity and a means for radiating light to the periphery such as a wall surface.
1 and the color temperature K2 of the light source of the means for emitting light to the surroundings are set to K1> K2.

[0018] As a result, the yellowish paper is illuminated with light having a higher color temperature than the surroundings, so that the paper looks white, and in the case of a normal line of sight, light enters the eyes and causes discomfort glare. Since the color temperature K2 is lower than the color temperature K1 of the downward light, unpleasant glare is reduced as compared with the case where the entire room is illuminated with the light having the color temperature K1.

Further, the color temperature K1 of the downward directivity light
5,000 [K] or more, and the color temperature K2
00 [K] or less. This makes the yellowish paper appear whiter and has less discomfort glare.

Further, the means for emitting light having substantially directivity downward is constituted by a light source having a color temperature of 5,000 [K] or more and a reflecting mirror having, for example, a paraboloid of revolution. lx] is obtained.
A means for radiating light to the surroundings is provided, for example, by arranging a light source having a color temperature of 3800 [K] or less outside the reflecting mirror, forming a lighting cover with a diffuse translucent material so as to include the light source, Is set to be 1/10 or more and 1/4 or less of the illuminance near immediately below.

Thus, the illuminance in the vicinity immediately below for reading can be ensured, and an illumination environment free from discomfort due to light colors can be obtained even when light having a high color temperature and light having a low color temperature exist indoors.

The reason for this will be described below. It has been empirically known that paper illuminated by a light source with a high color temperature looks whitish, but has not been quantitatively studied. Therefore, a prototype of a fluorescent lamp most widely used indoors, having an average color rendering index Ra of 80 or more and different color temperatures, was prototyped, and newspaper was selected as a representative example of yellowish paper. From the spectral distribution and the spectral reflectance of the newspaper, how the tint of the newspaper changed according to the color temperature was calculated. Next, when actually observed (seven observers), what kind of color it looks was determined by a subjective evaluation experiment. FIG. 2 shows the calculation result.
Observation results were the same as those in FIG. 2 as relative values.

The horizontal axis in FIG. 2 is the color temperature [K], and the vertical axis is the color b *. The closer the value of b * is to 0, the more it looks achromatic (white), and the larger the value of b *, the more it looks yellowish. From FIG. 2, the color temperature is 10,000.
Up to [K], the higher it looks, the whiter it looks. But,
It can be seen that when the color temperature exceeds 5000 [K], the effect of appearing white tends to be saturated.

On the other hand, the present inventor has clarified that the discomfort glare increases as the color temperature increases, even if the luminance of the light source is the same (Shogaku Magazine, Vol. 77, No. 6, p. 24-3).
0). This is shown in FIG.

Therefore, by setting the color temperature K1 of the downward light and the color temperature K2 of the peripheral light to be K1> K2, the yellowish paper can appear white and the discomfort glare can be reduced. can get. Further, by setting K1 to be 5000 [K] or more, the maximum effect that yellowish paper looks white can be obtained. On the other hand, the color temperature of K2 is 3800
[K] By increasing the discomfort glare,
Light bulb with the lowest color temperature as a practical light source (3000)
[K]) is obtained.

In addition, when the color temperature of the light illuminating the area immediately below and around the lighting fixture satisfies the above condition, the combination of illuminance that reduces the sense of discomfort due to the light color is determined by checking the illuminance near the area immediately below, ie, the newspaper. JIS recommends that the illuminance be at least 500 [lx].
The average illuminance immediately below was set to 500 [lx] and determined by a subjective evaluation experiment.

As a result, the illuminance on the wall surface is 50 to 110 [l
x], it was found that the unpleasant feeling of light color was minimized. This means that considering the adaptation characteristics of the human eye to the brightness, the illuminance in the surrounding area may be 1/10 or more and 1/4 or less of the illuminance in the vicinity immediately below. Japanese Patent Application No. 7-218524 and Japanese Patent Application No. 9-58922 relate to this, but all relate to the ease of concentration for visual work and the illuminance ratio, which are different from the object of the present invention. .

As described above, the indoor lighting apparatus is constituted by a means for illuminating the area immediately below and a means for illuminating the surrounding area. A light source having a color temperature of 5000 [K] or more is used as the means for illuminating the area immediately below. The illuminance is set to 500 [lx] or more, and the color temperature is set to 3800 as a means for illuminating the periphery.
By using a light source of [K] or less and setting the peripheral illuminance to be 1/10 or more and 1/4 or less of the illuminance immediately below, yellowish paper looks white and unpleasant glare is caused. In addition, an indoor lighting environment with less discomfort due to a difference in light color can be obtained.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing a configuration of a lighting fixture according to one embodiment of the present invention. In FIG. 1, 1 is a lighting fixture main body, 2 is a compact fluorescent lamp of 27 W having a color temperature of 6700 K, which is a downward light, and 3 is a substantially rotating parabola which emits the light of the compact fluorescent lamp 2 downward as directional light. Reflector with a surface, 4 is light to the periphery 3000
A 40 W ring-shaped fluorescent lamp having a color temperature of [K], 5 is a diffuse translucent lighting fixture cover, 6 is a lighting control unit, 7 is a ceiling, 8 is downward light, and 9 is peripheral light. .

As shown in FIG. 1, light having a color temperature of 6700 [K] emitted from the fluorescent lamp 2 becomes downward light 8 by the reflecting mirror 3, and a color temperature of 3000 [K] emitted from the annular fluorescent lamp 4. ] Is diffused by the lighting fixture cover 5 and illuminates the periphery almost uniformly as the ambient light 9.

As a result of installing the lighting fixture shown in FIG. 1 at the center of the ceiling of a laboratory simulating a living room of 8 tatami mats, an average illuminance of 620 [lx] was obtained on the table immediately below.
An average illuminance of 65 [lx] was obtained in the upper half of the wall. In addition, when the newspaper was spread and viewed immediately below, the paper surface appeared white, the clarity of the characters was high, and there was no discomfort glare even when the gaze was directed horizontally, and the lighting environment was free from discomfort in light color. .

In the embodiment shown in FIG. 1, even if a high-intensity discharge lamp having an equivalent color temperature is used as the light source of the 27 W compact fluorescent lamp 2 having a color temperature of 6700 K, it is 3000
A plurality of linear fluorescent lamps or a plurality of compact fluorescent lamps having the same color temperature may be used as the light source of the 40 W ring-shaped fluorescent lamp 4 having the color temperature of [K].

[0033]

As described above, according to the first aspect of the present invention, the indoor luminaire is constituted by a means for radiating substantially directional light downward and a means for radiating light to the periphery. Color temperature K
By setting K1> K2 to 1 and the color temperature K2 of light radiated to the surroundings, a yellowish paper looks white and an illumination environment with less discomfort glare can be obtained.

According to the second aspect, in addition to the configuration of the first aspect, the color temperature K1 of the substantially directional light is set to 5000.
[K] As described above, the color temperature K2 of light to the surroundings is set to 3800 [K].
By performing the following, a lighting environment in which yellowish paper looks more white and discomfort glare is further reduced is obtained.

According to the third aspect of the invention, in addition to the configuration of the second aspect, the illuminance E1 in the vicinity immediately below by the directional light is set to 500 [lx] or more, and the illuminance E2 in the vicinity is set to E1.
By setting 1/10 ≦ E2 ≦ E1 / 4, in addition to the effect of the second invention, illuminance for reading or the like can be secured, and an illumination environment with a sense of strangeness as a light color can be obtained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an indoor lighting device according to an embodiment of the present invention.

FIG. 2 is a characteristic diagram showing a relationship between color temperature and color of paper;

FIG. 3 is a characteristic diagram showing a relationship between discomfort glare and color temperature.

FIG. 4 is a configuration diagram of a conventional indoor lighting fixture.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body of indoor lighting fixture 2 Light source for downward directional light 3 Reflector for emitting light of light source 2 downward 4 Light source for ambient light 5 Translucent cover 6 Lighting control unit 7 Ceiling 8 Light downward 9 Light to

Claims (3)

[Claims] A means for radiating light substantially directionally downward and a means for radiating light to the periphery, wherein a color temperature K1 of the substantially directional light and a color temperature K2 of the light radiated to the periphery are provided. To K1>
K2 indoor lighting equipment. 2. The color temperature K1 of substantially directional light is set to 5000.
[K] As described above, the color temperature K2 of light radiated to the periphery is set to 3800.
[K] The indoor lighting fixture according to claim 1, wherein: 3. The illuminance E1 in the vicinity immediately below the substantially directional light is 500 [lx] or more, and the illuminance E2 in the vicinity due to the light to the periphery is E1 / 10 ≦ E2 ≦ E1 / 4.
The indoor lighting fixture as described.