JP2006221820A - Lighting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To homogenize the amount of a radiant luminous flux over the whole length which has been more in the vicinity of the light source and has become less accordingly as it goes away from the light source in a lighting fixture in which the light source is placed at the end part of a cylindrical body, and in which the inner face is made to have a mirror face, and in which a slit is installed in the longitudinal direction, and in which light is emitted in a long range while utilizing reflection of the inner face. <P>SOLUTION: In the inner part of the cylindrical body, a diffusion reflecting plate which is extended in the longitudinal direction of the cylindrical body and which is perpendicular to the slit and a diffusion reflecting plate which extends in the longitudinal direction and which is in parallel with the slit are placed. The amount of the radiant luminous flux emitted from the slit to the outside is homogenized by decreasing it in the vicinity of the light source and by increasing it in a position away from the light source. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to an illuminating device in which a light source is placed on one or both ends of a cylindrical body having a long mirror surface, and light is emitted from a slit to the outside.

Cylindrical lighting devices have been proposed as devices that can illuminate a long range with a small number of light sources for the purpose of lighting design that makes the light source appear to be continuous and maintenance that reduces the frequency of lamp replacement. Yes.

FIG. 1 shows a structural example of a lighting device that emits light over a long range from a slit 03 of a cylindrical body 02 having a light source 01 along the slit. FIG. 1 a is a block diagram of a light source, which has a lamp 31 and a back reflector 32. FIG. 1 b shows a case where the light source is provided on one side, and the end is covered with a terminal reflector plate 04. FIG. 1c shows the case with light sources on both sides. In any case, a specular reflector is stuck inside the cylindrical body 02.

FIG. 2 is a diagram for explaining the functional principle of the illuminating device of FIG. 1. Light from the light source 01 propagates in the cylindrical body 02 while being repeatedly reflected, and a part of the light becomes a light ray 05 to the outside from the slit 03. The light that is radiated and reaches the one end reflection plate 04 and is reflected by the reflection plate is also emitted as a light ray 05a, and both perform the illumination function.

Embodiments of the present invention will be described with reference to the drawings. 5a and 5b are views showing a part of the structural cross section of the cylindrical body 02 to which the present invention is applied, and FIGS. 5c and 5d are partially enlarged views thereof. The cylindrical body 02 is composed of, for example, two aluminum extrusion mold materials 21 having a bowl-shaped cross section shown in FIG. 5 a, and the protruding portions 21 b are fastened to each other by rivets 25. A specular reflector 22, for example Miro Silver manufactured by Allanod, Germany, is inserted into the groove 21 a of the aluminum mold 21 and fixed. In the slit 03, for example, a translucent plate 24 made of acrylic resin is fitted in the groove of the aluminum mold 21 and fixed with bolts 26 as shown in FIG. 5b, and has a light diffusion effect and also enters the cylindrical body 02 such as dust. Is preventing. The diffuse reflection plate 06 is a reflection plate having diffusion performance on both surfaces sandwiched and fixed in the recess 21 c of the cylindrical projection 21 b. Further, a mounting piece 27 is partially attached to the diffuse reflector 07 and is sandwiched and fixed in the cylindrical groove 21a. FIG. 6 is an explanatory diagram of a cross section of the structure when the cylindrical body 02 is viewed from the side in the embodiment in which the light source according to the present invention is provided at both ends of the cylindrical body 02. FIG. 6a is a schematic view of FIGS. 6b, 6c, and 6d. FIG. 6B is a side sectional view, FIG. 6C is an enlarged view of FIG. 6B in the vicinity of the light source 01, and FIG. 6D is an enlarged plan sectional view similar to FIG. 6C. As shown in FIG. 6B, the diffusive reflector 06 is provided in a symmetrical triangular shape at the center part away from both the light sources 01. This is because the central portion of the cylindrical body is farthest from both light sources, and therefore, the increase in the amount of light of the diffuse reflector 06 is most necessary at the central portion. The diffuse reflector 07 is provided symmetrically close to the light source 01 and close to the slit 03. This is because the amount of light is large in the vicinity of the light source 01, and therefore a reduction in the amount of light is most necessary in the vicinity. The diffuse reflector 07 is provided in the shape of an isosceles triangle as shown in FIG. 6d, and the width is narrowed toward the center of the cylindrical body 02 where it is less necessary to reduce the amount of light. In addition, it is effective to stick a specular reflection plate on the back surface of the diffuse reflection plate 07 that hits the back side with respect to the slit 03.

An embodiment in which the light source 01 is placed only on one side of the cylindrical body 02 as shown in FIG. Since the reflected light from the terminal reflecting plate 04 is weaker than the light from the light source 01, the portion where the light quantity emitted from the slit 03 is the smallest is closer to the terminal side, so that the shape of the diffuse reflecting plate 06 has a vertex at the light source 01. It becomes an inequilateral triangle closer to the end reflector 04 side. Similarly, the diffuse reflector 07 has a long isosceles triangle shape on the light source side and is short on the diffuse reflector plate installed on the terminal reflector side.

Structural drawing of a luminaire that has a light source at its end and emits light for a long time. Principle of lighting according to the present invention Explanatory drawing of the effect of the diffuse reflector by Claim 1 of this invention Explanatory drawing of the effect of the diffuse reflector according to claim 2 of the present invention Sectional view perpendicular to the longitudinal direction of parts and assembly of an embodiment of the present invention Example with light sources on both sides Example when there is a light source on one side only

However, in the illuminating device, the light is reflected many times in the cylindrical body 02 and is transmitted to the end, so that the amount of light that attenuates without reaching the slit increases as the distance from the light source increases. As a result, the light flux that exits from the slit 03 increases in the vicinity of the light source 01 and decreases as the distance from the light source 01 decreases. On the other hand, the output light flux increases again due to the reflection effect of the flat surface in the vicinity of the terminal reflector 04. have. Therefore, the use as a lighting fixture is limited with the limitation of the length of the cylindrical body 02.

In order to eliminate such drawbacks, the present invention additionally installs a diffusion reflector having a light diffusion effect over the longitudinal direction inside the cylindrical body 02 of the illumination device so that the reflection surface is orthogonal or parallel to the slit. Thus, it is intended to suppress and equalize the change in illuminance over a long distance.

The basic principle of claim 1 of the present invention will be described with reference to FIG. 3a and 3b are schematic cross-sectional views for explaining how light is reflected and propagated inside the cylindrical body 02. The light beam 05b emitted from the light source spreads in all directions as shown in FIG. 3a. Since the light is attenuated while being repeatedly reflected inside the cylindrical body 02 as in 3b, the light beam 05 reaching the slit 03 is limited as it goes to the end. Therefore, as shown in FIG. 3c, when the diffuse reflector 06 is added to a part of the cylindrical body 02 so as to be orthogonal to the slit 03 inside the cylindrical body 02, the light beam that should proceed while being repeatedly reflected in FIG. Part of 05b hits the diffuse reflector 06, diffusely reflects, and part of the light is emitted from the slit 03 to the outside as a ray 05c. Therefore, an effect of increasing the amount of light emitted from the slit 03 is produced.

The basic principle of claim 2 of the present invention will be described with reference to FIG. 4a, 4b, and 4c show one section of the cylindrical body 02 and the manner of reflection of light rays. A part of the light beam emitted from the lamp 31 of the light source is emitted from the slit 03 as shown in FIG. Therefore, as shown in FIG. 4B, a diffuse reflector 07 is installed at a position between the lamp 31 and the slit 03 in parallel with the slit 03 and in proximity to the slit. Then, as shown in FIG. 4 b, a part of the light beam emitted from the lamp 31 is blocked by the diffuse reflector 07 and does not reach the slit 03. FIG. 4 c is a diagram for explaining the configuration and effect of the cylindrical body 02 viewed from the side. At the position of the diffuse reflector 07, the light beam 05 is reflected by the specular reflector 22 and the diffuse reflector 07 to be slit. Although the light beam 05 is emitted from 03, the light beam 05 is blocked by the diffusive reflecting plate and changed to the light beam 05, and is not emitted from the slit 03. Therefore, the diffuse reflector has the effect of reducing the amount of light emitted from the slit 03. The light beam 05 propagates while being reflected, and a part of the light is radiated to the outside and effectively used at the slit 03 where the diffuse reflector 07 is not provided.

As described above, in the present invention, the diffuse reflectors 06 and 07 are provided inside the tubular body 02, and the width, length, and shape of the diffuse reflector and the longitudinal direction of the tubular body 02 or the direction perpendicular thereto. By changing the mounting position and using them in combination, the strong light emission near the light source 01 and the terminal reflector 04 is weakened, and the light emission is strengthened near the light source or the terminal reflecting surface where the light emission becomes weak. Thus, it is possible to suppress the change in illuminance due to the light radiated from the slit and realize an effect of making it more uniform. Therefore, the purpose of reducing the light source is achieved by the present invention, making use of the design of the lighting device, which is visible as a continuous light source, and requires illumination in a longitudinal shape, such as a street, an underpass, a station platform, a corridor, a building interior, etc. The application range of the lighting device can be significantly increased, and a new lighting device with good maintainability can be widely provided.

Explanation of symbols

01 Light source 02 Cylindrical body 03 Slit 04 End reflector 05 Light beam (A to E)
06 Diffuse reflection plate perpendicular to slit 07 Diffuse reflection plate 21 parallel to slit 21 Aluminum extrusion mold material 21 A Projection 21 for fixing two aluminum mold materials 21 B Recess 21 C provided for fixing 06 to the projection part Groove 22 for fixing the mirror material 22 in the interior 22 Specular reflector 23 Ventilation hole 24 Translucent diffuser plate 25 Rivet 26 Bolt and nut 27 Diffuse reflector 07 mounting piece 31 Lamp 32 Back reflector (reflector)

Claims (2)

In a lighting device that radiates light to the outside from one end or both ends of a cylindrical body having a mirror-finished inner surface and slits in the longitudinal direction, light diffusion extending in the longitudinal direction inside the cylindrical body An illuminating device, wherein a reflective plate having a function is provided so that the reflective surface is orthogonal to the slit. 2. The illuminating device according to claim 1, wherein a reflection plate having a light diffusion function extending in a longitudinal direction is provided inside the cylindrical body so as to face and be parallel to the slit.

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