JPH0528801B2 - - 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.

"Means for Solving the Problems" The present invention has been made to solve the above problems, and consists of a plurality of transparent lighting plates with phosphors dispersed inside them spaced apart in the thickness direction. line up in a row,
A feature is that an optical transmission line is connected to the ends of these lighting plates.

"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 at the end of the daylighting plate and transmitted. It is transmitted by Furthermore, when the daylighting plates are warmed by the incident light, an air flow due to natural convection flows between each daylighting plate.

"Embodiment" Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 to 3.
is supported so as to be tiltable, for example, about a horizontal axis The lighting plates 3 are housed in a line vertically parallel to each other, and at both ends of the lighting plates 3 (both ends in the axis X-X direction), there is an optical transmission device for transmitting the light collected by the lighting plates 3 to a predetermined location. Route 4 is connected.

The protective case 2 includes a box-shaped case body 5 with an open top, a transparent lid 6 that closes the top of the case body 5 and faces the uppermost lighting plate 3, and the case body 5. It consists of a dustproof cover 7 that covers the joint between the lid body 6 and the case body 5 and the periphery of the case body 5. The case body 5 has a large number of ventilation holes 8 passing through its side walls and bottom plate, and is also provided with a reflective surface 9 made of metal foil (for example, aluminum foil) pasted on its inner surface. The light that enters the protective case 2 through the reflective surface 8 is reflected by the reflective surface 8 to improve the efficiency of irradiating the light onto the daylight plate 3. The lid body 6 is, for example, a flat tempered glass plate, and a reflective film layer (not shown) that reflects infrared rays, that is, heat waves, is provided on the top surface of the lid body 6 to suppress the temperature rise inside the protective case 2. It's summery.

The lighting plate 3 is made of thermoplastic resin (for example, acrylic resin or polycarbonate resin) and phosphor (for example, oxides such as Ca, Ba, Mg, Zn, and Cd, sulfides, silicates, tungsten salts, etc. as main components). year,
This is made by adding Mn, Ag, Cu, Sb, Pb, etc. as an activator and firing) is uniformly dispersed and formed into a plate shape. As shown in FIG. 1, reflective films 10 are provided on both sides of the lighting plate 3 by pasting metal foil or by metal plating. Furthermore, all the lighting plates 3 are fixed to the bottom plate of the case body 5 by bolts 11 passing through them in the thickness direction, and there are gaps between each of the lighting plates 3 to maintain the above-mentioned distance S. A spacer 12 (for example, a washer attached to the bolt 11) is provided, and a spacer 13 is provided between the lowermost lighting plate 3 and the case body 5 to provide a space between them.
is provided.

As shown in FIG. 2, the optical transmission path 4 includes Fresnel lenses 14 attached to both end surfaces of a plurality of lighting plates 3, and is arranged with its ends facing the focal positions of these Fresnel lenses 14. It consists of an optical fiber 15 that penetrates the side wall of the case body 5 and is drawn out to the outside.
5 are bundled into a bundle outside the protective case 2 to form an optical fiber cable 16, which is laid to a predetermined location.

Note that reference numeral 17 in the figure indicates a holder for fixing the end of the optical fiber 15 to the side wall of the case body 5.

The lighting device configured in this way has, for example, a first
As shown in the figure, the protective case 2 is installed outdoors with it tilted with respect to the horizontal direction, that is, fixed so that the top surface of the lid 6 and the lighting plate 3 slope southward. . Then, direct sunlight and sky light enter the daylighting plate 3 from all directions through the lid 6. At this time, the lighting board 3
The incident light in the visible region that enters the interior is absorbed by the phosphor in the lighting plate 3 and activates (excites) it, so the phosphor emits light with a spectral component shifted to the infrared region compared to the incident light. is emitted in a radial direction centered on the phosphor. Next, the emitted light from the phosphor is absorbed by another phosphor in the same daylighting plate 3 or a lower daylighting plate 3 to generate new radiated light, or the light emitted from each daylighting plate 3 is absorbed. While repeating reflections alternately at the upper and lower critical surfaces, the light is finally concentrated at both ends of each lighting plate 3, focused by the Fresnel lens 14, and irradiated onto the end of the optical fiber 15, as shown by arrow A in FIG. be done. The emitted radiation light is then transmitted to a predetermined location through the optical fiber cable 16. Incidentally, the incident light or the emitted light that has passed through all the lighting plates 3 and reached the reflective film 10 is reflected by the reflective film 10 as indicated by the arrow B in FIG. 3 to excite the phosphor again.

On the other hand, if the daylighting plate 3 is heated by the incident light during daylighting, there is a risk that it will deform or deteriorate. Natural convection occurs and the temperature rise of the lighting board 3 is suppressed. In other words, the air inside the protective case 2 warmed by the heat dissipated from the lighting plate 3 becomes lighter and rises, and the air inside the protective case 2 rises through the ventilation hole 8 in the upper position as shown by the arrow in FIGS. 1 and 2. Along with this, cold air from the outside world flows into the protective case 2 from the ventilation holes 8 at the lower position, and as shown in FIG. It passes through the space and removes heat from the lighting board 3 while passing upward. Incidentally, the dustproof cover 7 is connected to the protective case 2 from the ventilation hole 8, etc.
The upper surface of the lighting plate 3 is kept clean by preventing dust and rainwater from entering the case body 5.
Prevents corrosion on the inner surface.

In the embodiment described above, the optical transmission line 4 may be connected to both ends of the lighting plate 3 and all sides thereof, or may be connected only to one end. Further, by attaching the Fresnel lens 14 to each daylighting plate 3, the state of air circulation between the daylighting plates 3 can be further improved.

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

Since the entire upper surface of the lighting board can be used as a lighting surface and both direct light and sky light can be brought in, the lighting efficiency is extremely good and it can be used even on cloudy days.

Since large-scale auxiliary equipment is not required, equipment costs are low and the equipment location is less subject to restrictions.

It operates simply by placing it at the installation location, so maintenance costs are low, and since there is no need for a drive part, power transmission part, or electric circuit part, it is safe, long-term reliable, and easy to maintain. be.

While increasing the amount of daylight by using multiple daylighting plates, by providing space between the daylighting plates, airflow due to natural convection can flow between the daylighting plates, thereby suppressing the rise in temperature of the daylighting plates. be able to.

By providing a Fresnel lens on the end face of the lighting plate and using the Fresnel lens to converge the light from the lighting plate, the number of optical fibers used can be reduced and a cheaper device can be obtained.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention, FIG. 2 is a view taken along the - line in FIG. 1, and FIG. 3 is an enlarged sectional view of main parts to explain the operation. 2... Protective case, 3... Lighting plate, 4... Optical transmission line, 8... Ventilation hole, 10... Reflective film, 11...
Bolt, 12, 13... Spacer, 14... Fresnel lens, 15... Optical fiber, 16... Optical fiber cable, S... Spacing.

Claims (1)

[Claims] 1. A transparent lighting plate with phosphor dispersed inside,
A lighting device characterized in that a plurality of lighting plates are arranged in a line at intervals in the thickness direction, and an optical transmission path is connected to the ends of these lighting plates.