JPH0543082B2 - - Google Patents

Description

Detailed Description of the Invention "Field of Industrial Application" The present invention relates to a device that takes in sunlight and transmits it to a predetermined space, and in particular, it relates to a device that takes in sunlight and transmits it to a predetermined space. It is related to the device.

``Conventional technology'' Conventionally, devices for capturing light in the visible range were:
Devices that use direct light and devices that use sky light (indirect light) are known. An example of a direct light type device is one that focuses light using a Fresnel lens and transmits the focused light using an optical fiber or the like. Further, as a sky light type device, there is one that uses a plurality of mirror reflectors arranged in parallel.

"Problems to be Solved by the Invention" By the way, when these devices are used to collect sunlight, the direct light type devices have a very large drawback in that they cannot be used on cloudy days. In addition, additional equipment such as a mechanical device (for example, an automatic sunlight tracking device) and a power source are required to keep the Fresnel lens facing the direction of sunlight incidence even during clear weather, making the entire device large-scale. This limits the installation location and makes the device expensive. On the other hand, skylight type devices have the advantage of being usable on cloudy days, but have the drawbacks of a small lighting area and large losses in the transmission path.

Therefore, the applicant proposed a lighting device that can capture both direct light and sky light and can be used even on cloudy days by installing an optical fiber at the end of a transparent lighting plate with fluorescent elements dispersed inside. We have already provided a "lighting device" that is made by connecting optical transmission lines such as the following. However, in the case of this "daylighting device", it is necessary to pull out the optical fiber from the end face of the daylighting plate in the plane direction of the daylighting plate, so the space occupied in this plane direction becomes large, and the whole inside of the daylighting plate Since the light is propagated to the end of the lighting plate, there are still some issues that need to be improved, such as the larger the lighting plate, the higher the attenuation rate of the light during propagation.

"Means for Solving the Problems" The present invention has been made to solve the above-mentioned problems, and includes a transparent lighting plate in which fluorescent material is dispersed, and a protective case covering the lighting plate. The lighting plate is provided with a recessed portion having an inclined surface inclined with respect to the plate surface, a reflective surface made of a metal reflective layer is provided on the inclined surface of the recessed portion, and a reflective surface made of a metal reflective layer is provided on the inclined surface of the recessed portion, A light transmission path is provided via a Fresnel lens at a position facing the reflective surface, and a reflective film is provided on the surface of the protective case facing the back surface of the lighting plate.

"Function" In the daylighting device of the present invention, when direct light, sky light, etc. enters the daylighting plate, the phosphor is excited and emits light, and the light of this phosphor is collected on the reflective surface and the light is reflected in the daylighting plate. The light is reflected in the thickness direction, and the reflected light is transmitted through the optical transmission path. In addition, since an optical transmission path is provided via a Fresnel lens at a position facing the reflective surface, it becomes possible to collect light using a light-collecting plate, efficiently collect the light reflected by the reflective surface, and guide it to the optical transmission path. . Furthermore, since a reflective film is provided on the surface facing the back surface of the daylighting plate, the incident light or emitted light that has passed through the daylighting plate is also reflected by the reflection film and enters the daylighting plate again, thereby exciting the phosphor. In addition, since a protective case is provided to cover the lighting board, it is less affected by wind and rain and can be installed outdoors.

"Embodiments" The present invention will be described below based on embodiments shown in the drawings.

1 to 3 show an embodiment of the present invention, in which a transparent light collecting plate 2 having a flat plate shape is housed inside a protective case 1. As shown in FIGS. The upper surface (plate surface) of this daylighting plate 2 is provided with a plurality of V-shaped groove-shaped recesses 3 having a depth approximately equal to the thickness of the daylighting plate 2, and the surface of these recesses 3 is covered with silver foil as shown in FIG. By pasting a metal reflective layer 4 such as the above, a reflective surface 5 is provided which is inclined at an angle θ (for example, 45°) with respect to the plate surface of the lighting plate 2. And lighting board 2
An optical transmission line 6 is disposed near the lower surface (plate surface) of the reflector 5 at a position opposite to the reflecting surface 5. An optical transmission line 6 is provided to guide the light collected by the light-collecting plate 2 to a predetermined location via a Fresnel lens 21.

The protective case 1 includes a saucer-shaped case body 7, a transparent lid 8 that closes the upper part of the case body 7 and faces the upper surface of the lighting plate 2, and a combination of the case body 7 and the lid 8. It consists of a dustproof cover 9 that covers the joint portion and the side wall portion of the case body. The case body 7 has a large number of ventilation holes 10 passing through its side wall, and is equipped with a reflective film 11 made of metal foil (for example, aluminum foil) pasted on its inner surface, and this reflective film 11 allows light to pass through. By reflecting the light, the efficiency of irradiating the light onto the daylighting plate 2 is increased. The lid body 8 is, for example, a flat tempered glass plate, and its upper surface has infrared rays,
That is, a reflective film layer (not shown) that reflects heat rays is provided to suppress the temperature rise within the protective case 1. Further, the dustproof cover 9 prevents dust and rainwater from entering the protective case 1 through the ventilation holes 10 etc., keeps the top surface of the lighting plate 2 in a clean state, and prevents corrosion of the case body 7. It is something.

The lighting plate 2 is made of thermoplastic resin (for example, acrylic resin or polycarbonate resin) and phosphor (for example, oxides such as Ca, Ba, Mg, Zn, Cd, etc., sulfides, silicates, tungsten salts, etc.). The main ingredient is
This is made by adding Mn, Ag, Cu, Sb, Pb, etc. as an activator and firing it) and then uniformly dispersing it and forming it into a plate shape. As shown, it is covered with a reflector 12 formed by pasting a metal plate or metal foil, or by performing a metal plating process. The lighting plate 2 is fixed to the bottom plate of the case body 7 by bolts 13 passing through it in the thickness direction, and is also fixed to the bottom plate of the case body 7 by spacers (for example, bolts 13 It is held apart from the bottom plate by a washer (14) inserted therein.

The optical transmission path 6 is placed opposite the lower surface (polished surface 15) of the lighting plate 2 in the portion immediately below the recess 3, and a plurality of optical transmission paths 6 are arranged along the recess 3 as shown in FIG. It consists of a fiber assembly 16 and a holder 17 that fixes the end of the optical fiber assembly 16 to the bottom plate of the case body 7, and the plurality of optical fiber aggregates 16 penetrate through the bottom plate. The optical fiber cables 18 are pulled out below the protective case 1, bundled together to form an optical fiber cable 18, and laid to a predetermined location.

When the daylighting device configured as described above is installed outdoors with the top surface of the daylighting plate 2 facing toward the sky, sunlight will be exposed to the inside of the daylighting plate 2 from all directions through the lid 8 as shown by the arrow in FIG. direct light and sky light are incident. At this time, the incident light in the visible range that has entered the light-lighting plate 2 activates (excites) the phosphor in the light-lighting plate 2, so the phosphor has a spectral component shifted to the infrared region than the incident light. The phosphor emits light in a radial direction centered on the phosphor. Next, the radiant light from the phosphor is absorbed by another phosphor to generate new radiant light, or while it is alternately reflected on the upper and lower critical surfaces of the lighting plate 2, or by the reflector 12. The light propagates inside the lighting plate 2 in the direction of the plate surface, and is finally collected on the reflecting surface 5. The light collected on the reflective surface 5 is reflected downward (in the thickness direction of the lighting plate 2) as shown by the arrow in FIG. The light is irradiated onto the end of the optical fiber assembly 16 and is further transmitted to a predetermined location through the optical fiber cable 18. Incidentally, the incident light or the emitted light that passes through the lighting plate 2 downward without being collected on the reflective surface 5 is reflected by the reflective film 11 of the case body 7 and enters the lighting plate 2 again, causing the phosphor to emit light. excite.

On the other hand, FIGS. 4 and 5 show other embodiments of the present invention. This daylighting device has a daylighting plate 2.
A large number of mortar-shaped recesses 19 are provided on the upper surface of the
A reflective surface 20 is formed by providing a metal reflective layer 4 on the surface of this recess 19, and a Fresnel lens 21 facing the polished surface 15 is further provided at a position opposite to this reflective surface 20.
an optical fiber 22 with its end facing the focal position of 1;
The configuration is such that an optical transmission path 23 consisting of the following is provided. In such a daylighting device, the emitted light of the phosphor is collected from the radiation direction toward the mortar-shaped recess 19, that is, the conical reflecting surface 20, and furthermore, the light reflected by these reflecting surfaces 20 is collected. Since the light is focused by the Fresnel lens 21 as shown by the arrow in FIG. 5, the number of optical fibers 22 used can be reduced.

"Effects of the Invention" As explained above, according to the present invention, the following excellent effects can be obtained.

(a) A reflective surface that is inclined with respect to the surface of the daylighting plate is provided, and an optical transmission path is provided at a position opposite to this reflective surface, that is, on the side (lower surface) of the daylighting plate, so that optical fibers, etc. By pulling out the plate in the thickness direction, the space occupied by the entire device in the plane direction of the lighting plate can be reduced. In other words, since the ratio of the area of the upper surface (lighting surface) of the daylighting plate to the space occupied by the device in the horizontal direction becomes large, it is possible to efficiently let in sunlight in a narrow installation location.

(b) Since the optical transmission path is provided through a Fresnel lens at a position facing the reflective surface, the light that is collected by the lighting plate and reflected by the reflective surface can be efficiently collected and guided to the optical transmission path. Therefore, the whole can be made compact and the space occupied during installation can be reduced.

(c) A reflective film is provided on the surface facing the back side of the lighting plate, so that incident light or emitted light that has passed through the lighting plate is also reflected by the reflective film and enters the lighting plate again to excite the phosphor. Therefore, efficient lighting can be achieved.

(d) Since a protective case is provided to cover the lighting board, it is less susceptible to wind and rain and can be installed outdoors.Also, the lighting board is protected by the protective case when in use. performance can be maintained, thereby providing a high degree of freedom regarding the installation location.

(e) As mentioned in (b) and (c) above, by efficiently concentrating light, the whole can be made compact, and as mentioned in (d), it can also be installed outdoors. Therefore, there are an extremely large number of installation locations.

(f) Since the light inside the daylight plate is focused on the reflective surface provided halfway through the daylight plate, attenuation of the light inside the daylight plate can be suppressed. That is, it is possible to increase the size of the lighting board while maintaining the lighting efficiency at a certain level.

(g) Since it can take in both direct light and sky light, it has good lighting efficiency and can be used even on cloudy days.

(h) Since large-scale auxiliary equipment is not required, equipment costs are low and installation locations are less subject to restrictions.

(i) Maintenance costs are low because it operates just by placing it at the installation location, and there is no need for a drive part, power transmission part, or electric circuit part, so it is safe, long-term reliable, and easy to maintain. Easy to manage.

[Brief explanation of the drawing]

1 to 3 show one embodiment of the present invention, in which FIG. 1 is a vertical sectional view, FIG. 2 is an enlarged view of the portion indicated by the reference numeral in FIG. 1, and FIG. 3 is a lighting plate and an optical fiber. A perspective view of the assembly, FIGS. 4 and 5 show other embodiments of the present invention, FIG. 4 is a perspective view of a lighting plate and an optical fiber, and FIG. 5 is a view taken along the - line in FIG. 4. It is. 1...Protective case, 2...Lighting plate, 3, 19...
... recess, 4 ... metal reflective layer, 5, 20 ... reflective surface, 6, 23 ... optical transmission path, 11 ... reflective film, 1
6... Optical fiber assembly, 18... Optical fiber cable, 21... Fresnel lens, 22... Optical fiber.

Claims (1)

[Claims] 1. A transparent lighting plate with fluorescent material dispersed inside,
It is equipped with a protective case that covers this lighting board,
The lighting plate is provided with a recessed portion having an inclined surface that is inclined with respect to the plate surface, and a reflective surface made of a metal reflective layer is provided on the inclined surface of the recessed portion, and the reflective surface is near the plate surface and is provided with a reflective surface made of a metal reflective layer. A lighting device characterized in that an optical transmission path is provided via a Fresnel lens at a position facing the lighting device, and a reflective film is provided on a surface of the protective case facing the back surface of the lighting plate.