JPH0447846Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a lighting device that utilizes sunlight, and more specifically, to an improvement in a lighting device that can be easily produced and efficiently collect light.

[Background of the invention] Conventional technology for bringing sunlight into a room using glass fibers has been disclosed in many publications and gazettes, but the technology for efficient light concentration in particular was disclosed in Utility Model Application Publication No. 58-43707. No. 59-
It is disclosed in No. 45805, No. 59-126406, etc.

Utility Model Application Publication No. 58-43707 is a technology that focuses sunlight focused by a condensing lens onto a condensing reflector using a side reflector, and then takes the reflected light from the reflector into a glass fiber and guides it indoors. However, this technique has the drawback that the combination of condensing lens systems is complicated and the fabrication of the condenser is difficult.

No. 59-126406 discloses a technology related to a daylight consisting of a condensing lens and a total reflection mirror installed on the inner wall of the daylight, but it is said that it is difficult to install a total reflection mirror on the inner wall of the daylight. Not only does it have its drawbacks, but it also has the drawback of not being able to receive sunlight from oblique directions, such as in the morning and evening.

No. 59-45805 discloses a technique in which the tip of a glass fiber is provided at the focal point of condensing light from a condensing lens fixed to a housing. However, this technique has the disadvantage that it requires as many condensing lenses as there are glass fibers, making it extremely uneconomical.

In addition to the above-mentioned technology, a solar tracking type is also in production.
These are disclosed in No. 59-9315, No. 59-9316, No. 59-144705, etc., but they are completely unsatisfactory from an economic point of view.

Therefore, an object of the present invention is to provide an illumination device that uses sunlight, which can easily produce a concentrator and can efficiently condense light.

[Means for Solving the Problems] The present inventor has made extensive studies to achieve the above object, and as a result, has arrived at the present invention.

That is, the lighting device using sunlight according to the present invention is a lighting device that connects a light concentrator that collects sunlight and a light scattering lens for illumination installed indoors with an optical fiber. The container is a rod-shaped lens, and includes a condensing lens whose upper half is arcuate or arcuate in cross section and whose lower half is narrow, and is provided along the outer surface of the lower half of the condenser lens. The base ends of a plurality of glass fibers are connected in series along the lower edge of the lower half of the condensing lens, while the light scattering lens for illumination is made of a rod-shaped body. The present invention is characterized in that the ends of the plurality of glass fibers described above are connected in series.

[Function] The feature of the present invention lies in the shape of the condenser. In particular, the shape of the upper and lower halves of the transparent rod is changed, and the upper half has a light condensing function and the lower half has a light conduction function. This shape eliminates manufacturing difficulties, and since there are no obstacles on the wide light collection surface, it can collect light efficiently over a long period of time from morning until evening. This is what made it possible. Furthermore, the condensing lens used in the present invention has a rod-like configuration, so that it is not necessary to have as many condensing lenses as there are optical glass fibers, that is, it can be handled with just one condensing lens. .

An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic perspective view showing an example of a lighting device according to the present invention.

In the figure, 1 is a concentrator for concentrating sunlight. Reference numeral 2 denotes a transparent rod-shaped condensing lens, which is made of, for example, transparent glass or transparent plastic.

The upper half 2A of the condenser lens 2 has a semicircular cross section, and the lower half 2B has a narrow cross section.

The narrow shape of the lower half portion 2B is not limited to that illustrated;
It is sufficient if it is inclined so as to become narrower toward the bottom.

The method for producing the condensing lens having the above shape is not particularly limited, but any general molding technique for glass or plastic may be used.

Reference numeral 3 denotes a reflecting plate provided along the outer surface of the lower half portion 2B of the condensing lens 2. To form the reflective plate 3, for example, it may be fixed using a reflective mirror, aluminum, silver paper, etc. (using an adhesive, transparent adhesive tape, etc.), or it may be coated with a white or silver pigment, etc. Alternatively, it may be mirror-finished or vapor-deposited. In either case, it is sufficient if total reflection is possible. Note that the upper limit position of the reflector 3 is not strict;
It may protrude somewhat into the upper half 2A of the condenser lens 2.

4 is a glass fiber fixed along the lower end of the lower half 2B of the condenser lens 2. A fixing tool may be interposed in the fixing portion as necessary, or an adhesive or the like may be used.

The glass fibers 4 are focused and connected in parallel to a light scattering lens 6 for illumination placed indoors 5. In addition, if the amount of condensed light is large, a plurality of light scattering lenses may be provided. Note that the glass fiber 4 may be a tubular fiber or a focusing fiber.

As a result of the above configuration, when the upper half 2A of the condensing lens 2 is directed toward sunlight, the light is refracted and enters the condensing lens 2, is reflected and condensed by the reflector 3, and is reflected on the glass. Introduced into the fiber 4 and sent to the light scattering lens 6, sunlight can be used as illumination light, even if only one condensing lens 2 is used.
It becomes a linear illumination light source like a fluorescent lamp.

In particular, even if only one condensing lens is used, if the longitudinal direction of the condensing lens 2 is placed in the north-south direction, light can be efficiently condensed from sunrise to sunset. When installed with the longitudinal direction facing east-west, light can be collected efficiently regardless of seasonal changes.

Furthermore, it is preferable to adopt a known means for preventing solar heat from being transmitted to the glass fiber.
The condenser lens 2 can be fixed along the bottom edge of the
Any means can be adopted, such as creating a vacuum inside. In the above case, it is preferable to provide two translucent heat shielding plates or heat insulating plates and create a vacuum between them.

[Effects of the Invention] As described above, the present invention has the advantage that a condenser can be easily manufactured and light can be condensed efficiently.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view showing an example of a lighting device according to the present invention. 1... Concentrator, 2... Condensing lens, 2A... Upper half of condensing lens, 2B... Lower half of condensing lens, 3
...Reflector, 4...Glass fiber, 5...Indoor, 6...Light scattering lens.

Claims (1)

[Scope of utility model registration request] In a lighting device in which a concentrator for concentrating sunlight and a light scattering lens for illumination installed indoors are connected by an optical fiber, the concentrator is a rod-shaped lens, and the top is It consists of a condenser lens whose half part is arcuate or arch-shaped and whose lower half part is narrow, and a reflector provided along the outer surface of the lower half of this condenser lens, and which is located below the condenser lens. The base ends of a plurality of glass fibers are connected in series along the lower edge of the half, while the illumination light scattering lens is a rod-shaped body, and the ends of the plurality of glass fibers are connected in series. A lighting device that utilizes sunlight, characterized in that it has a connected configuration.