JPS5825524Y2 - lighting equipment - Google Patents

Description

[Detailed Description of the Invention] Technical Field of the Invention The present invention relates to lighting equipment, and relates to a structure that can eliminate uneven lighting on walls of art museums, for example.

Technical background of the invention and its problems In conventional wall lighting equipment of this type, louvers are used to prevent direct light from shining onto viewers of exhibits such as paintings displayed on the wall. However, this louver has a large number of louver pieces arranged at equal intervals with an angle of inclination in the direction of inclination of the irradiation direction. A configuration is adopted in which the light source is placed on one side.

However, in this conventional lighting equipment, the influence of the louver on the irradiated wall surface on the direct light from the light source and the reflected light reflected by the reflector plate is not taken into account, so although the wall surface is uniformly illuminated, the upper part of the wall surface There will be uneven brightness and darkness, and a sufficient lighting effect will not be obtained.

That is, as shown in FIG. 1, direct light from the rod-shaped fluorescent lamp 1 is blocked by the louver piece 3 of the louver 2, creating a dark shadow on the upper part of the wall surface 4.

The larger the distance from the lamp 1 to the louver piece 3 of the louver 2, the larger the shadow of the area where the lamp 1 looks into the louver piece 3 is ■
-■■-III and a dark area 5 appears on the wall surface 4,
Further, direct light passes through the slit-shaped gap between the upper end 6 of the louver piece 3 of the louver 2 and the lower end 7 of the adjacent louver piece 3, and a bright part 8 is formed on the wall surface 4.

Further, as shown in FIG. 2, the irradiated light from the lamp 1 is reflected by the reflector 9, and the reflected light is blocked by the louver piece 3 of the louver 2, but the shadow of the reflected light is continuous in a penumbra shape. Since they overlap, there is no problem like blocking direct light.

In this way, in conventional lighting equipment, the reflector and the louver are arranged at a large distance, so the direct light from one lamp 1,
The reflected light is blocked by the large number of louver pieces 3 of the louver 2, creating a slit-like beam of light, resulting in noticeable uneven brightness and darkness on the upper part of the wall near the light source, where bright and dark areas are relatively direct light and there is little reflected light. It has its drawbacks.

Purpose of the invention The present invention was developed in view of the above points, and it is possible to obtain a uniform illumination distribution without uneven illumination on the irradiated surface such as a wall surface in the irradiated direction, and to prevent direct light from being irradiated in directions other than the irradiated direction. The purpose of this invention is to provide lighting equipment that is made of

Summary of the invention The lighting equipment of the invention includes a rod-shaped light source such as a fluorescent lamp 11,
A chevron-shaped reflecting plate 10 is provided opposite to each of the light sources, and the reflecting plate 10 is provided along the longitudinal direction of the bar-shaped light source and spaced apart from each other.
a plurality of louver pieces disposed near the opening end of the reflector plate 10, and the rod-shaped light source is disposed near the opening end of the reflecting plate 10;
The louver pieces include first louver pieces 14 and 15 extending downwardly from both ends of each reflecting plate 10 in a direction perpendicular to the longitudinal direction thereof, respectively, and extending downwardly in the irradiation direction. The first louver piece 14.15 has a gap between which the upper end is close to the opening of the reflecting plate 10 and faces the light source, and the first louver piece 14.15 is arranged so that the direct light from the rod-shaped light source is irradiated only through this gap. and second louver pieces 16 and 17 arranged parallel to the irradiation direction, and the second louver piece 16 on the irradiation direction side has its upper end connected to the first louver piece 14 on the irradiation direction side.
The second louver piece 17 on the opposite side to the irradiation direction is located at the intersection of the tangent A on the cross section of the light source connecting the lower ends of the light source and the line B connecting the opening ends 10 a and 10 b of the reflecting plate 10 . Its lower end is connected to the vertical line C of the light source and the first louver piece 1.
It is located at the intersection with the line connecting the lower ends of 4.15,
Direct light from the light source is irradiated only from the second louver pieces 16 and 17, so that unevenness in brightness does not occur on the irradiated surface.

Embodiment of the Invention Next, the structure of an embodiment of the invention will be explained with reference to FIGS. 3 to 5.

Reference numeral 10 denotes a reflecting plate having an open lower surface and a chevron-shaped cross section in the width direction, and is widened on the irradiated wall surface side, and a plurality of reflecting plates 10 are arranged in parallel in the same direction with their open ends touching.

A rod-shaped light source, for example, a fluorescent lamp 11, is arranged along the longitudinal direction of each reflecting plate 10 near the opening end thereof.

Further, louvers 13 are arranged along the longitudinal direction of each of the lamps 11 and spaced apart from each other near the opening end of each of the reflection plates 10 .

This louver 13 extends from the front opening end 10a and the rear opening end 10b in the direction perpendicular to the longitudinal direction of the reflecting plate 10.10 toward the wall surface side in the irradiation direction at an angle of about 15 degrees from the vertical direction. It has a first louver piece 14.15.

Further, there is a gap between the first louver pieces 14 and 15, the upper end of which is close to the open end of the reflecting plate 10 and faces the lamp 11, so that direct light from the lamp 11 is irradiated only through this gap. A second louver piece 16,17 is provided.

That is, the upper end is located at the intersection of the tangent A on the cross section of the lamp 11 connecting the lower edge of the first louver piece 14 on the front side and the line B connecting the open end of the reflector 10, and the upper end is positioned at the open end of the reflector 10. A second louver piece 16 on the front side in the irradiation direction is provided parallel to the first louver piece 14°15.

In addition, the lower end is located at the intersection of the vertical line C on the cross section of the lamp 11 and the line connecting the lower end of the first louver piece 14.15, and the first louver piece on the rear side opposite to the irradiation direction is positioned. A second louver piece on the rear side opposite to the irradiation direction with its upper end located near the intersection of the lower end of the louver piece 15, the tangent P on the cross section of the lamp 11, and the line B connecting the open end of the reflector plate 10. 17 is provided parallel to the first louver piece 14.15.

Next, the operation of this embodiment will be explained.

Since the upper end of the second louver piece 16 on the front side of the louver 13 is in contact with the line A connecting the tangent on the cross section of the lamp 11 and the lower end of the first louver piece 14 on the front side, as shown in FIG. The tangent on the cross section of the lamp 11 from the ceiling surface 18 and the second front side
The lamp does not directly illuminate the range up to E of the wall surface 19 connecting the lower edges of the louver pieces 16, and no slit light is generated.

Also, the lamp 11 begins to be visible from point E on this wall surface 19 to point G on the wall surface 19 on the line F connecting the tangent on the cross section of the lamp 11 and the lower end of the second louver piece 16 on the front side. The following is directly illuminated by the lamp 11.

In this way, the direct light from the lamp 11 spreads to the area H only from between the second louver pieces 16 and 17 before and after the louver 13, so that uneven brightness does not occur on the wall surface 19.

Further, the reflected light reflected by the reflector 10 is blocked by the louver 13, resulting in a continuous shadow, but other reflected light and direct light all form a continuous penumbra, resulting in a specific dark area. It does not appear unevenly.

As shown in FIG. 5, the distribution of the direct light on the wall surface 19 in terms of brightness is the distribution shown by the ■ line, and the wall surface 19 of the reflected light
The distribution is as shown by line J, and furthermore, each of the first and second louver pieces 15 .
The distribution of the light reflected at 17 and reaching the wall surface 19 becomes a line L, and these distributions become a line M, resulting in uniform brightness as a whole.

Furthermore, as shown in FIG. 4, a uniform illuminance distribution with no unevenness in brightness can be obtained not only when all four lamps are turned on, but also when three lamps, two lamps, and so on are thinned out.

Note that the reflecting plate 10 and the louver 13 may be configured as one unit, and the front and rear first louver pieces 14, 15 and the reflecting plate 10 may be integrally configured as a reflecting plate.

In addition, when the lighting fixtures are arranged side by side, as shown in FIG. 4, the front and rear first louver pieces 14 and 15 are used as one louver piece.

Furthermore, this lighting fixture is not limited to wall lighting, and even in the case of a lighting fixture that illuminates the bottom surface, by configuring it as in the present invention, uneven light can be prevented in the same way.

Effects of the invention According to the invention, a plurality of louver pieces spaced apart from each other along the longitudinal direction of the light source near the opening end of the chevron-shaped reflector disposed opposite to the bar-shaped light source are arranged in a direction perpendicular to the longitudinal direction of the reflector. A first louver piece extends downward from both ends at an angle in the irradiation direction, and a gap is provided between the first louver pieces to face the light source, and the direct light from the light source is irradiated only through this gap. The second louver piece includes a line connecting the tangent on the cross section of the light source connecting the lower end of the first louver piece on the irradiation direction side and the opening end of the reflecting plate. The upper end of the second louver piece on the opposite side to the irradiation direction side is located at the intersection of the vertical line of the light source and the lower end of the first louver piece. Therefore, direct light is not irradiated on the louver side corresponding to the reflector that is installed independently and opposite to other light sources, and the irradiation surface of the direct light irradiated from each light source is continuously changed from bright to dark. There is no uneven lighting, and the shadows formed by the louver pieces are all reflected by other reflected light and direct light, creating a penumbra, so there are no specific dark areas that cause unevenness, and the light is uniform. It is possible to obtain a bright illuminance distribution with a simple configuration, and is particularly suitable for illuminating paintings displayed on the walls of museums and the like.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the reflected light of a conventional lighting fixture, Fig. 2 is an explanatory diagram of the reflected light of the same as above, Fig. 3 is a sectional view of a lighting fixture showing an embodiment of the present invention, and Fig. 4 is a diagram of the same as the above. A cross-sectional view of the installed shape,
FIG. 5 is an explanatory diagram of the illuminance distribution same as above. DESCRIPTION OF SYMBOLS 10... Reflection plate, 11... Fluorescent lamp as a rod-shaped light source, 14.15... First louver piece, 16.17... First louver piece. 2 louver pieces.

Claims (1)

[Scope of utility model registration request] The light source includes a bar-shaped light source, a chevron-shaped reflector disposed opposite to the light source, and a plurality of louver pieces disposed near the opening end of the reflector along the longitudinal direction of the bar-shaped light source and spaced apart from each other. , the rod-shaped light source is disposed near the opening end of the reflecting plate, and the louver piece has a plurality of louver pieces extending downward from both ends in a direction perpendicular to the longitudinal direction of each of the reflecting plates, respectively, at an angle in the irradiation direction. A gap exists between the first louver piece and the first louver piece, the upper end of which is close to the opening of the reflecting plate and faces the light source, so that the direct light from the rod-shaped light source is irradiated only from this gap. The second louver piece is arranged parallel to the first louver piece.
The second louver piece on the irradiation direction side connects its upper end to the tangent on the cross section of the light source connecting the lower end of the first louver piece on the irradiation direction side and the opening end of the reflection plate. The second louver piece on the side opposite to the irradiation direction side has its lower end located at the intersection of the line in the vertical direction of the light source and the lower end of the first louver piece. Lighting equipment characterized by: