JPH0279303A - Lighting device - Google Patents

Abstract

PURPOSE:To prevent the room from being illuminated differently in brightness by providing a reflecting board with a transparent coat layer having high reflectance formed on the surface of a white painted steel board. CONSTITUTION:An asymmetric reflecting board 13 consists of a white painted steel board 16 with a white layer 15 formed on a surface of a steel board 14 and a transparent coat layer 17 with a smooth surface, where irregular reflection components due to the white layer 15 and regular reflection components having high directivity of the coat layer 17 overlap to make up reflection characteristics 73 of said reflecting board 13. Therefore, said reflection is good in spreading and soft to eyes, as well as highly illuminant and with a direction of illumination easy to control. This enables respective sections of a room to be lightened with approximately uniform brightness.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a lighting fixture that includes a light source and a reflector.

2. Description of the Related Art Generally, a lighting device is provided with a reflecting plate facing a light source in order to control the direction of light irradiation and provide good illumination. Here, as such a reflecting plate, a white reflecting plate and a specular reflecting plate are mainly used.

Therefore, a lighting fixture using such a reflector will be explained based on FIGS. 7 to 10. This lighting fixture 1 is intended to be embedded in a ceiling surface 2, for example, and here a trapezoidally bent reflector plate 4 and a straight tube type are installed inside a rectangular parallelepiped chassis 3 that is open at the bottom. Fluorescent light 5
It has a structure with As illustrated in FIG. 8, the light distribution characteristics 6 of this lighting fixture 1 are symmetrical.

In such a configuration, when the fluorescent lamp 5 of the lighting fixture 1 is turned on, the light emitted from the fluorescent lamp 5 is reflected by the reflection plate 4 and illuminates the room together with the direct light. Here, for example, if the reflector 4 is a white reflector 41, its reflection characteristic 71 has many diffuse reflection components and weak directivity, as illustrated in FIG. Therefore, the lighting fixture 1 using such a white reflector 41 has a good spread of light and provides soft illumination to the eyes. On the other hand, when the reflecting plate 4 is a specular reflecting plate 42, its reflection characteristic 72 has almost no diffused reflection component and is specular reflection with strong directivity, as illustrated in FIG. Therefore, the lighting fixture 1 using such a specular reflection plate 42 has a high light reflectance, so it is bright, and the direction of light irradiation can be easily controlled.

Problems to be Solved by the Invention The above-described lighting fixture 1 is effective because it provides good illumination by providing the reflector 4. Here, if the reflector 4 of the lighting fixture 1 is a white reflector 41, its reflection characteristics 71 include many diffuse reflection components and low reflectance, so the illumination tends to be dark, and furthermore, the directivity is weak. Therefore, it is difficult to control the direction of reflected light. On the other hand, when the reflector 4 is a specular reflector 42, the diffused reflection component is small and the directionality is strong, so the reflected light tends to be concentrated in a specific direction, making it difficult to illuminate the room evenly. Further, such a mirror surface requires complicated cleaning because stains such as fingerprints are very noticeable.

Here, the above-mentioned lighting equipment] has generally been used as a lighting device (not shown) that is continuously arranged in a line on the ceiling surface 2. However, in such a lighting device, the area directly below the lighting fixture 1 is bright, but the areas to the sides are quite dark, so in order to improve work efficiency and protect vision, a lighting device that illuminates the entire room evenly is desired. Ta.

Therefore, in recent years, lighting devices have been developed in which four rectangular lighting fixtures 1 as described above are combined in a square shape to form one cursive-shaped lighting unit (not shown), and these are continuously arranged on the ceiling surface 2. (not shown) was developed. In such a lighting device,
When each lighting fixture 1 is turned on, the lighting unit acts as a pseudo surface light source, so compared to a lighting system in which the lighting fixtures 1 are arranged continuously in a line, the room is illuminated almost evenly. can. However, there are still differences in brightness on the floor surface corresponding to the arrangement of each lighting unit.

In other words, compared to the part of the floor directly below the center of each lighting unit that is the brightest, the part of the floor between each lighting unit has a brightness of 70 to 80%.
It has been measured that the illuminance obtained is only about %. In other words, it has been found that the brightness varies depending on the location of the room.

Means for Solving the Problems In a lighting fixture equipped with a light source and a reflector, the reflector is provided with a transparent coating layer having a high reflectance formed on the surface of a white painted steel plate.

In lighting equipment equipped with an active light source and a reflector, by providing a reflector with a highly reflective transparent coating layer formed on the surface of a white-painted steel plate, the diffused reflection component of the light reflected from the white-painted steel plate is eliminated. In most cases, the light reflected from the coating layer has a strong directional specular reflection component.Furthermore, the reflector is made of a white painted steel plate with a highly reflective transparent coating layer formed on its surface and curved into an asymmetrical, almost parabolic shape. It is also conceivable to install a lighting system in which multiple lighting units with four lighting fixtures arranged in a square shape are installed continuously on the ceiling surface. In this case, since there is a large amount of light directed outward from each illumination unit, the light intersects appropriately, so that the area below between each illumination unit, which tends to be dark, is effectively illuminated.

Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 to 5. Note that the same parts as those of the lighting fixture 1 illustrated in FIGS. 7 and 8 are given the same names and symbols, and explanations thereof will be omitted. In addition, here, the illuminator W10 in which the illumination device 8 is installed on the ceiling surface 2 as a mouth-shaped illumination unit 9 will be explained as an example. First, this lighting fixture 8 will be explained. As illustrated in FIG. 2, this lighting fixture 8 has a ballast 11 at the top.
An asymmetrical reflector 13 and a fluorescent lamp 5 are disposed inside a rectangular parallelepiped-shaped chassis 12 in which an asymmetric reflector 13 and a fluorescent lamp 5 are disposed. The asymmetrical reflector 13 has a structure in which it is divided into upper and lower halves, and the combined cross-sectional shape of these halves has an asymmetrical shape like a tilted parabola. The fluorescent lamp 5 is placed near the apex of the asymmetrical reflector 13 away from the center of the lighting fixture 8. Furthermore, as illustrated in FIG. 1, this asymmetrical reflector 13 is made of a white-painted steel plate 16 on which a white layer 15 is formed on the surface of a steel plate 14, and a material coated with acrylic, epoxy, polyester, etc. The coating layer 17 has a transparent and smooth surface, and its reflection characteristics 73 are similar to those of the white layer 1.
The diffused reflection component caused by 5 and the specular reflection component with strong directivity caused by the coating layer 17 overlap. Therefore, this reflected light spreads well and is soft on the eyes, yet has high illuminance and is easy to control the irradiation direction. Furthermore, due to the shape of the asymmetrical reflector 13, the light distribution characteristic 18 of this lighting fixture 8 spreads asymmetrically in the left and right directions, as illustrated in FIG. Note that a looper 19, which is formed in an asymmetrical substantially triangular shape here, is continuously attached to the opening of the asymmetrical reflector 13.

Next, a lighting device 10 using this lighting fixture 8 will be explained. As illustrated in FIG. 4, this lighting device 10 is constructed by arranging four lighting devices 8 as described above in a substantially square shape with the fluorescent lamps 5 located inside each one to form one lighting unit 9. The lighting equipment 8 is embedded in the ceiling surface 2 so that the lighting units 9 are continuous in the vertical and horizontal directions. At this time, each lighting fixture 8 has its asymmetrical light distribution characteristic 1
8 peaks 18a are arranged so as to exist outside each illumination unit 9.

In such a configuration, when a large number of lighting fixtures 1 arranged on the ceiling surface 2 as lighting units 9 are turned on, they uniformly illuminate the room as a pseudo surface light source. At this time, each lighting fixture 1 emits a large amount of light toward the outside of the lighting unit 9, so that even the floor surface area that tends to be dark is effectively illuminated. When we actually measured the illuminance of each part of these floor surfaces, we found that even the darkest part had 80% of the illuminance of the brightest part.

Note that although the lighting equipment 8 of this embodiment uses the asymmetrical reflectors 13 and is arranged in a mouth shape to provide approximately uniform illumination, the present invention is not limited to this. Instead, for example, by using a symmetrically curved reflector, a lighting fixture 21 with a twin beam light distribution 20 as illustrated in FIG.
It is also possible to form a line and install it in a line.

Effects of the Invention The present invention provides a reflector in which a transparent coating layer with high reflectance is formed on the surface of a white painted steel plate as described above, so that the light reflected from the white painted steel plate has many diffuse reflection components.
The light reflected from the coating layer has a large amount of specular reflection component with strong directionality and high reflectance, so the light spreads well and is soft on the eyes, and the irradiation direction can be controlled, resulting in reflected light with high illuminance. As a result, a highly versatile lighting fixture that can be used with a variety of lighting devices is obtained, and in addition, a reflective reflector made of a white painted steel plate with a transparent coating layer with high reflectance formed on the surface is curved into an asymmetrical, almost parabolic shape. It is also conceivable to install a lighting system in which multiple lighting fixtures each having a board are installed, and multiple lighting units each having four of these lighting fixtures arranged in a square shape are installed continuously on the ceiling surface. In this case, since there is a large amount of light directed outward from each lighting unit, this will intersect appropriately, so it will effectively illuminate the lower part between each lighting unit, which tends to be dark, and it will be possible to roughly illuminate various parts of the room. It is expected that it will be possible to obtain a lighting device with uniform brightness.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional side view of the reflector of the lighting equipment of the present invention, Fig.
The figure is a longitudinal side view, Figure 3 is a bottom view of a lighting device with lighting fixtures arranged in a mouth shape, Figure 4 is an explanatory diagram of how the lighting fixtures are used, Figure 5 is an explanatory diagram of light distribution characteristics, Fig. 6 is an explanatory diagram of a lighting fixture with other light distribution characteristics, Fig. 7 is a longitudinal cross-sectional side view of a conventional example of the lighting fixture, Fig. 8 is an explanatory diagram of the light distribution characteristic, and Fig. 9 is an explanatory diagram of the reflection characteristic. , FIG. 10 is an explanatory diagram of reflection characteristics. 8...Lighting equipment, 13...Reflector, 16...White painted steel plate, 17...Coating layer Applicant Toshiba Electric Materials Corporation 1 (:4shi'1・i・11

Claims (1)

[Scope of Claims] 1. A lighting device comprising a reflector plate having a transparent coating layer with high reflectance formed on the surface of a white painted steel plate. 2. The lighting device according to claim 1, wherein the reflecting plate is formed by forming a transparent coating layer with high reflectance on the surface of a white painted steel plate and is curved into an asymmetrical substantially parabolic shape.