JP2002270014A - Light duct device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light duct device capable of illuminating an interior with non-glaring diffused light, suitable for use as a light source for growing plants and relatively easy to install as compared with a conventional one. SOLUTION: This light duct is composed of a first planar body 11 formed by sticking a fire-protecting light diffusing sheet to the opposite side of a prism finish surface of a prism sheet, and a second planar body 12 having a mirror- finished reflecting surface. The prism finish surface of the first planar body is oppositely disposed to the mirror-finished reflecting surface of the second planar body with a predetermined space. The light duct is so installed on a ceiling surface as to face the planar body 11 to the interior. Natural light introduced from a daylighting opening 3 provided with a reflecting plate 3a is guided into the interior by the light guide, and radiated to the interior through the light diffusing sheet of the planar body 11 and thus the interior is lightened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical duct device for illuminating the interior of a room by introducing natural light to emit light in a planar manner on a ceiling or a wall surface.

[0002]

2. Description of the Related Art In recent years, the necessity of environmental protection has been attracting attention due to energy saving and reduction of carbon dioxide emission. One of the means for responding to this demand is sunlight (natural light).
There is proposed an optical duct lighting device that takes light into a room and uses it as a light source for lighting. For example, JP-A-11-251
No. 073 discloses that natural light is guided into a building by a light duct and emitted from a light emitting opening, thereby illuminating the inside of the building and adjusting the illuminance of artificial lighting according to a change in external light. A dimming device for maintaining a constant brightness in a building is disclosed. Also, Japanese Patent Application Laid-Open No. 9-97507 discloses that sunlight is introduced from one end of a transmission section having a prism sheet on an inner peripheral surface in a cylindrical shape, and artificial illumination is provided on the other end of the transmission section. BACKGROUND ART An external light introduction lighting system that illuminates a room by emitting sunlight and artificial light into a room from a provided light emitting unit is disclosed.

[0003]

A conventionally proposed lighting device using natural light guides natural light into a room through a light duct, and emits the light into a room through a light emission port provided in the light duct. Although the illuminance around the light emitting opening can be secured, the room was not fully illuminated. Further, the conventional light duct device has a problem that it is necessary to install a light duct in the ceiling and provide a light emission port on the ceiling surface, which is not easy to construct and relatively expensive. In particular, in order to uniformly illuminate a large room, it is necessary to install a large number of light ducts accordingly, and the cost has increased. Furthermore, the conventional light duct device emits natural light guided from the outside into the room through the light emission port, and cannot uniformly irradiate the entire surface of the room. However, it was not suitable for use for growing plants. The present invention has been made in consideration of the above circumstances, and an object of the present invention is to illuminate a room with diffused light without glare, and to use it as a light source for growing plants. An object of the present invention is to provide an optical duct device that is suitable and that is relatively easy to construct as compared with a conventional duct device.

[0004]

According to the present invention, the above-mentioned problems are solved as follows. The light duct is composed of a first planar body in which a fire-resistant light diffusion sheet is bonded to the back side of the prism processing surface of the prism sheet, and a second planar body having a mirror reflection surface. The prism processing surface of the planar body and the specular reflection surface of the second planar body are arranged to face each other at a predetermined interval, and the light duct faces the room with the first planar body facing the room. On the ceiling or wall. Then, the indoor light is illuminated by guiding the natural light taken in from the lighting opening into the room through the light duct and emitting the light into the room through the light diffusion sheet of the first planar body. In the present invention, since the light duct is configured as described above and natural light introduced into the room is emitted through the light diffusion sheet, the room can be illuminated with diffused light without glare. It can also be used as a light source for growing plants. Furthermore, since the structure of the light duct is simply a structure in which the first planar body and the second planar body are opposed to each other, the construction of the optical duct is easy, and it can be manufactured at low cost.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a view showing a construction state of an optical duct device according to an embodiment of the present invention. FIG. 1 shows an optical duct device according to an embodiment of the present invention installed on a ceiling surface of an office. The state is shown. In this figure, reference numeral 1 denotes a floor surface, 2 denotes a window, and a lighting port 3 is provided above the window 2, and natural light reflected by a reflector 3a of the lighting port 3 is installed on a ceiling in this embodiment. To the light duct 10.

FIG. 2A shows an example of the configuration of the light duct. As shown in the figure, the light duct 10 has a first planar body 11 in which a fire-resistant light diffusion sheet 11b is bonded to the back side of a prism processing surface of a prism sheet 11a, and a second surface having a reflecting mirror surface 12a. And the prism processing surface of the first planar body 11 and the reflecting mirror surface 12a of the second planar body 12 are arranged so as to face each other at a predetermined interval. . As the light diffusion sheet, it is desirable to use a non-combustible material such as a light-transmitting Teflon (registered trademark) material. Further, as the non-combustible light diffusion sheet, a silicon coating film having a light transmittance higher than that of the Teflon material can be used. The light that has entered the light duct 10 from the reflection plate 3a is shown in FIG.
As shown in (a), the prism sheet 11a and the reflecting mirror surface 1
The light travels through the light duct while repeating the reflection at 2a, and is reflected by the reflector 3b (see FIG. 1) provided at the back of the light duct 10, and the same reflection as above is repeated. Further, a part of the light incident on the prism sheet 11a is radiated indoors through the light-transmitting light diffusion sheet 11b. As shown in FIG. 1, a lighting fixture 20 is attached to the ceiling linearly from the window in the depth direction of the room, and the first planar body 11 is supported by a lighting fixture attachment member.

FIG. 2B shows an example of a mounting structure of an optical duct. This figure shows a view of the inside of the light duct from the window side in FIG. As shown in the figure, a lighting fixture mounting member 21 is mounted on a ceiling surface by a support member 22, and a lighting fixture 20 is mounted on the lighting fixture mounting member 21.
The lighting device mounting member 21 includes a first planar body mounting portion 2.
1a is formed, on which the first planar body 11 is placed. If the rigidity of the first planar body is low and the first planar body cannot be supported simply by being placed on the mounting portion 21a, the first planar body may be connected to a light-transmitting plastic or glass plate. The body 11 is overlapped with the first planar body mounting portion 21.
a.

The light duct device of this embodiment has the above-described structure, and natural light entering from the outside is reflected inside the light duct and radiated into the room through the light diffusion sheet 11b. Can be performed, and the room can be filled with soft diffused light without glare. The effect of the light duct device of the present example was examined using the experimental equipment provided with the light duct described in the above example. The depth of the room used for the experiment is about 12.8 m, the width is 9.6 m, and the ceiling height is 2.7 m (1/10 scale was used in the experiment). When the illuminance in the room was examined with the window blinds closed (without artificial lighting) using the experimental facility equipped with the light duct device, the difference in illuminance between the back of the room and the vicinity of the window was small. However, a sufficient illuminance of 1100 lux was obtained. On the other hand, the illuminance in a state where the window blind was opened (without artificial lighting) without installing the light duct device was 1200 lux in the back of the room and 30 lux in the middle of the room.
It will be about 00 looks. However, where the direct light on the window side is incident, it becomes tens of thousands of lux and the blind has to be substantially closed. If the blind is closed in a room where the light duct device is not provided, the illuminance in the room becomes 10 lux or less, which is a level that cannot be operated without artificial lighting.

As described above, according to this embodiment, natural light is taken into the room, and the entire surface of the ceiling is illuminated.
The interior of the room can be illuminated with a small difference in illuminance, and since the room is illuminated by natural light, it is possible to illuminate the room in accordance with the human rhythm. Further, the light duct device of the present embodiment has a first surface in which a plate-like body having a reflecting mirror surface on a ceiling surface, a lighting fixture attaching member is attached, and a prism sheet and a light diffusion sheet are bonded between the lighting fixture attaching members. Since the state-of-the-art body 11 may be installed, the construction is extremely simple, and the structure can be formed at a low cost.

In the above embodiment, the light duct is installed in the office room. However, if the illuminance fluctuation is allowed in the corridor, around the core, etc., and if the required illuminance is about 100 to 200 lux, artificial light is used during the day. No lighting is required. Also, in the above embodiment, the case where the light duct is installed on the ceiling surface is shown, but if the light duct of this embodiment is installed on the wall surface, the wall surface can be illuminated with soft diffused light without glare,
A comfortable living space can be configured. Further, in the above-described embodiment, the example in which the light duct is installed on the entire ceiling of the office is shown. However, the light duct device of the present invention may be installed not only in the office, but also in various facilities, a general house, and the like. . Also,
In addition, by installing it on the ceiling surface of a greenhouse or the like as described later, a greenhouse with a multi-layer structure can be configured, and the space can be efficiently used. Further, it is not always necessary to provide on the entire surface of the ceiling surface or the wall surface, but may be provided on a part of the ceiling surface or a part of the wall surface.

FIG. 3 is a diagram showing an embodiment in which the optical duct device of the present invention is applied to a greenhouse having a multi-layer structure. In the same figure, reference numerals 3a and 3b denote reflectors, and 10 denotes a light duct. As in the above-described embodiment, the light-diffusing sheet 11b is attached to the back side of the prism processing surface of the prism sheet 11a. It is composed of a first planar body 11 and a second planar body 12 having a reflecting mirror surface 12a. The prism processed surface of the first planar body 11 and the mirror reflection of the second planar body 12 are provided. The surfaces 12a are arranged facing each other with a predetermined interval. In FIG. 3, natural light reflected by the reflecting plate 3a is transmitted to the light duct 10 of the present embodiment installed on the ceiling of each floor.
The light travels through the light duct while being repeatedly reflected by the prism sheet 11a and the reflecting mirror surface 12a shown in FIG. 2, is reflected by the reflector 3b provided at the back of the light duct 10, and repeats the same reflection as described above. Also, the prism sheet 11a
Of the light incident on the greenhouse is radiated into the greenhouse via the light-transmitting light diffusion sheet 11b. In the greenhouse, for example, a planter in which plants are planted is installed, and the plants of the planters are irradiated with the soft diffused light from the light duct as described above. As described above, since the light duct device of the present invention can cause the entire surface of the ceiling surface to emit light by natural light,
The plants in the greenhouse can be uniformly irradiated with natural light, and the plants can grow efficiently. Further, by using the optical duct device of the present invention, the greenhouse can be configured in multiple layers, and the space can be significantly reduced as compared with a conventional greenhouse or the like.

[0012]

As described above, in the present invention,
The following effects can be obtained. (1) Since illumination is performed using natural light, it is possible to significantly reduce power during the day. (2) By making the ceiling or the wall a light duct and emitting light in a plane, low-brightness and large-area illumination can be performed, and the room can be filled with soft diffused light without glare. (3) Construction is easier than conventional light ducts, and cost can be reduced. (4) If illuminance fluctuation is allowed in a corridor, around a core, and the like, and the required illuminance is about 100 to 200 lux, artificial lighting is not required during the day. (5) Illumination can be performed using natural light that matches the human rhythm.

[Brief description of the drawings]

FIG. 1 is a diagram showing a conceptual configuration of an optical duct device according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration of an optical duct according to an embodiment of the present invention.

FIG. 3 is a diagram showing an embodiment in which the present invention is applied to a multi-level greenhouse.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Floor surface 2 Window 3 Lighting opening 3a, 3b Reflection plate 10 Light duct 11 First planar body 11a Prism sheet 11b Light diffusion sheet 12 Second planar body 12a Reflecting mirror surface 20 Lighting fixture 21 Lighting fixture attaching member 22 Support Member 21a First planar body mounting portion

Claims (1)

[Claims] 1. An optical duct device for illuminating an interior of a room by guiding natural light taken in from a daylight opening into a room through a light duct and emitting the light from a ceiling surface or a wall surface, wherein the light duct is formed by prism processing of a prism sheet. A first planar body having a fire-retardant light diffusion sheet bonded to the back side of the surface, and a second planar body having a mirror-reflective surface, and a prism processed surface of the first planar body. The mirror reflection surface of the second planar body is disposed so as to face a predetermined interval, and the light duct is placed on a ceiling surface or a wall surface such that the first planar body faces the room. A light duct device, wherein the natural light introduced from the lighting port is emitted into the room through the light diffusion sheet of the first planar body.