JPH0434805A - Natural lighting device - Google Patents

Abstract

PURPOSE:To receive almost the same amount of light in a day, regardless of the displacement of an incident light by forming a natural lighting part of sun beam out of a prism and of a lens of high density conversion, and by effectively converging the incident light at the prism part into the other surface. CONSTITUTION:A natural lighting device 7 is formed out of a natural lighting part 12 and of a light introduction duct 22. Ducts 20 and 22 are provided on the upper end of the light introduction duct 22 in an integrated, or separated form, and the light is guided to each chamber 1-5. The natural lighting part 12 is formed by connecting prisms 16, 16' and high density conversion lenses 17a, 17b together. Even when the incident angle of the sun beam changes, the light is effectively converged by the internal reflection by the prism, and is converged at high density level by the high density conversion lens, and the sun beam can thus be taken in effectively without using a tracking device.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to improvements in daylighting devices used for lighting residential buildings, office buildings, and the like.

[Conventional technology] Traditionally, it was used as a daylighting device to guide outdoor light indoors.

As shown in Japanese Patent Application Laid-Open No. 62-96914, sunlight collected by a lens or the like is transmitted to a suitable room through an optical fiber, and a light diffusion device is used at the exit of this optical fiber to direct sunlight to the required room. There was something to introduce.

In addition, as another conventional example, a solar ray utilization system has been introduced in which the sunlight is introduced indoors through a light duct.

(Collection of lecture papers from the 1986 Japan Solar Energy Society/Japan Wind Energy Association/Joint Research Presentation Conference, page 169~
(Page 172) [Problems to be solved by the invention] By the way, the conventional daylighting device configured as described above has 1
There was the following problem.

■The altitude and direction of the sunlight that is taken in changes depending on the time of day and season, so it is
It cannot be introduced as parallel light, and is repeatedly reflected in the light duct before being transported into the room.

As a result, the conveyance efficiency changes, and it only functions effectively for a limited time.

■For this reason, when trying to track the sun, an additional expensive and complicated tracking device is required, and it is also large, making it difficult to mount it on a roof.

An object of the present invention is to provide a daylighting device that solves the above-mentioned problems of the conventional device.

[Means for Solving the Problems] The daylighting device of the present invention is a daylighting device that guides sunlight into a room, in which the daylighting part that takes in the light is a prism, and the light absorbed by the prism is collected at a high density. It is configured with a condenser lens.

[Function] In the daylighting device of the present invention, the sunlight daylighting part is composed of a prism and a lens (pivot lens, etc.) that collects high-density light.

By utilizing the internal reflection, the light incident from one surface can be efficiently focused on the other surface, and therefore, the amount of light received at -day can be kept approximately constant regardless of the displacement of the incident light.

Furthermore, since the high-density condensing lens portion can condense the light received by the prism with high density, the efficiency of transporting the light to each chamber can be improved.

In this case, by combining a plurality of prisms, the light-collecting area can be increased, and by arranging a plurality of high-density condensing lenses, the density of the collected light can be further improved.

[Embodiments] Next, nine embodiments of the daylighting device according to the present invention will be described based on FIGS. 1 to 5.

Figure 1 shows an example of a house showing the configuration of a solar ray utilization system to which the present invention is applied.
Room 1. Room 2111 2. There are 3 baths and 4 kitchens on the north side.
Basement basement 5. The roof 6 has a lighting device.

In this building, the basement 5 naturally has no windows in the bath 3 and kitchen 4 on the north side, and the surrounding wall 8 is made of a sufficiently thick insulating wall, while daytime lighting in these rooms is provided by daylighting devices. Using the light from E, light is supplied to each room at 3°4.5 by means of light diffusing devices 9, 10, and 11.

In this case, the daylighting device 2 is composed of a daylighting part λ fitted into the roof 6 and a light guide duct 22 that guides the light taken in from the daylighting part 12 into the room, as shown in FIG.

In addition, both ducts 20 and 22 are provided integrally or separately so that the upper end of the light guiding duct 22 faces the lower end of the light guiding duct 20 communicating with the lighting section H as shown in FIG. ~5 is arranged to guide light.

Further, a Fresnel lens 21 is arranged inside the light guide duct 20.

First, the principle of the lighting section 1 of the present invention will be explained with reference to FIGS. 3 and 4.

Since the lighting section of the present invention is constructed by combining a prism and a high-density condensing lens, the construction and operation of these components will be explained first.

(1) Prism FIGS. 3(a) and 3(b) are a perspective view and a longitudinal sectional front view, respectively, of the prism 13 used in the present invention.

As shown in the figure, when light is irradiated from the sun S to the prism 13 with the apex angle α, it is reflected within the prism 13 at each internal reflection angle h2 to h, as shown in the figure (b). By repeating this process, the light is finally focused on the condensing surface 13a, and the light condensing surface 13a
Light is transmitted to the outside. It is assumed that a reflective film 13b is provided on the bottom surface of the prism 13 as shown by the broken line, and the internal reflection angle h5 is selected to be smaller than the critical angle determined for each material.

When the refractive index of the prism is n.

h, ≦cos-' (1/n) 11. (1) holds true.

In order for the angle of incidence to satisfy equation (1), h1≦cos
-'(n cos[cos-'(1/n)+2 a
]) ... (2) n=1.5. If α=25°, (1
), From formula (2), hs≦48.2@hl≦102.3
' becomes.

The sun's altitude is approximately 75° in Tokyo during the summer solstice season.

Solar altimeter α; 75° + 25° = ioo” In this case,
Since ≦1o2゛ is satisfied, the above-mentioned condition of ≦102° indicates that even a fixed prism can sufficiently concentrate sunlight.

It is possible to further improve the efficiency by forming the bottom surface of the prism into a curve such as a parabola.

Furthermore, by forming the entrance surface into a curved surface bent in the east-west direction, the shape corresponds to the diurnal movement of the sun, so efficiency is further improved.

(2) High-density condensing lens As a high-density condensing lens, there is a conical pivot lens as shown in FIG.

This principle is similar to that of a prism, and as shown in FIG. 4, light incident on the incident surface 14a of the pivot lens 14 is focused on the converging surface 14b using internal reflection.

When connecting an optical fiber or a duct (not shown) to the light condensing surface 14b, by using a suitable Fresnel lens on the light converging surface 14b side, the light can be efficiently transported to a rear chamber or the like.

(3) Combination of prism and high-density condensing lens It is even more effective to combine the prism 13 and high-density condensing lens 14 described above, and an example of this configuration is shown in FIG.

In the same figure (a), the incident surface of the high-density condensing lens 14 is ↓4. i! This is the basic form that applies the following.

In addition, the same figure (b) is an example of this application, and the front prism 15
are divided into a plurality of prisms, for example, two prisms 15a+ and 15az, and arranged side by side, and the light converging surface 15b of these prisms is
+, an additional prism 16 is placed horizontally on 15b2,
In addition, the incident surface 17 is on the condensing surface 16a of the additional prism 16.
This is an example in which the high-density condensing lens 17 is arranged based on
7, it is possible to bring in light from a large area even with just one.

Furthermore, if these are combined into one unit and connected in parallel, it becomes possible to bring in light from a very large area.

The best embodiment of the present invention is a combination of a plurality of prisms and a plurality of lenses as shown in FIG.
The configuration is an application example of FIG. 5(b).

That is, in FIG. 5, n front prisms 15a+ to 15a7 are arranged side by side, and 16 and 16° are arranged laterally in directions opposite to the light condensing surfaces of these prisms 15a1 to 15an, respectively. The two rear prisms 17a and 17b are high-density condensing lenses such as pivot lenses whose incident surfaces are in contact with the converging surfaces of the rear prisms 16 and 16, respectively. This is an optical fiber provided on the condensing surfaces of lenses 17a and 17b.

19 is a transparent glass provided to prevent dust from entering.

In the above configuration, during the daytime, sunlight is collected by the daylighting device and supplied to each room 3°4.5 on the north side. The light is condensed onto the condensing surfaces of prisms 16 and 16'' through the condensing surfaces of 15 a 1 to 15 a h, further condensed by lenses 17 a and 17 b, and then connected to optical fibers 18 a and 1
8b, the light is emitted to the light guide duct 20, the light is converted into a parallel light beam by the Fresnel lens 21 disposed in the duct 20, and thereafter efficiently transported to each room by the light guide duct 22'. .

[Effect of the invention] This is because the present invention is configured as described above.

It has the following excellent effects.

■By combining a prism and a high-density condensing lens, even if the angle of incidence of sunlight changes, the irradiated sunlight is effectively condensed by internal reflection on the prism in the daylighting part, and the high-density condensing lens Since the light is focused at a high density by the system, it is possible to efficiently capture sunlight even though it is a fixed structure without a tracking device.

- Since the lighting device of the present invention has a simple structure as described above, it can be easily installed on the roof and the equipment cost can be reduced.

(2) In this case, the lighting area can be increased by arranging a plurality of prisms in parallel as shown in the embodiment.

Furthermore, if multiple pairs of high-density medicinal lenses are used, the density of the received light can be increased accordingly, and it can be systemized as a convenient daylighting device that can flexibly respond to lighting requirements in buildings.

[Brief explanation of drawings]

Figures 1 and 2 show an embodiment of the present invention, and Figure 1 of Chinese cabbage is a schematic longitudinal sectional side view showing the overall configuration of a solar ray utilization system to which the daylighting device of the present invention is applied. FIG. 2 is a perspective view showing the structure of the lighting section of the present invention. Figures 3 to 5 show the basic configuration of the lighting section of the present invention, of which Figures 3 (A) and (B) are respectively a perspective view and an enlarged longitudinal sectional front view of the prism, and Figure 4 is a high-level elevation view. FIGS. 5A and 5B are perspective views of the density condensing lens, respectively, showing examples of combinations of a prism and a high-density electro-optical lens. 16.16' Nibrism 17a, 17b: High-density condensing lens 18a, 18b: Optical fiber 20.22: Light guiding duct 21: Fresnel lens

Claims (1)

[Claims] A lighting device that guides sunlight into a room, characterized in that a lighting section that takes in light is composed of a prism and a high-density condensing lens that collects the light collected by the prism at a higher density.