JP2000162541A - Lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device by which solar light directivity is alleviated homogeneous light is obtained and lighting reduction is suppressed. SOLUTION: The lighting device is provided with a lighting port 58 to collect the solar light L, a light guide 64 transmitting the solar light L indoors, an outgoing port 60 irradiating the indoor part with the solar light L and a lighting cover 20 located on the lighting port 58, made as a light transmitting diffusion body by forming fine projecting and recessing shapes on the surface or part of the surface of a transparent member. In this case, the inside 20a or part of the inside of the lighting cover 20 is advantageously made to be of the projecting and recessing shapes either by forming finely truncated pyramidal or semispherical protrusions or by attaching fine granular transparent bodies.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a daylighting device which is mounted on a roof of a building or the like to receive sunlight and guide it into a room.

[0002]

2. Description of the Related Art Hitherto, a daylighting device which is attached to a building roof or the like and receives sunlight has been put to practical use. In this conventional lighting device, a transparent dome or a dome-shaped milky white light scatterer or a flat glass is attached to a lighting opening provided on a roof or the like of a building, and sunlight transmitted therethrough is reflected on a light reflecting surface or a mirror surface. The sunlight is guided indoors through a light guide path formed by a light guide wall having a reflective surface.

[0003] This conventional daylighting device will be described with reference to FIG.

FIG. 4 is a vertical sectional side view showing a schematic structure of a conventional lighting device 50. As shown in FIG. 4, the conventional lighting device 50 has a gantry 44 mounted on a roof 40 of a building or the like. Installed as a foundation.

[0005] In FIG. 4, 52 is attached to a lighting opening 58 provided above the roof 40 so as to collect the sunlight L from the sun S and to protrude upward to shut off room and outside air. It has a shape, for example, a dome-shaped lighting cover (hereinafter referred to as “dome cover”). Dome cover 52
A lighting plate 56 is arranged below the lighting device. Further, the light guide path 64 is constituted by surrounding the light guide wall 66 having an inner wall surface 66a formed on the light reflection surface around the light guide wall 64.
A light distribution plate 62 for diffusing the sunlight L is provided at an exit 60 of the light guide path 64 from the upper side to the indoor side of the ceiling 42 so as to guide the sunlight L into the room.

The light guide wall 66 used in the conventional lighting device 50 includes a light guide wall 66 made of a white painted wall or a light guide wall 6.
6 has an inner wall surface 66a covered with white cloth.
Further, as the light guide wall 66, a transparent protective film was formed on the surface of a metal surface, or a reflective plate having a mirror-like light reflecting surface by providing a metal film on the surface of a transparent sheet was used. There are also things.

With the above configuration, the sunlight L from the sun S taken from the dome cover 52 passes through the lighting plate 56,
The light enters the light guide path 64 at various angles corresponding to the altitude of the sun S. At this time, the sunlight L is directly incident on the light exit 60 depending on the incident angle, or as shown in FIG.
The light is reflected once on the inner wall surface 66a, or a plurality of times (not shown), and guided into the room.

When the sunlight L is guided indoors, the sunlight L
By passing through the light distribution plate 62 provided at 0, the light is diffused as shown by the arrow in FIG. 4, and the room is illuminated uniformly.

[0009]

By the way, in the above-mentioned lighting device, since the sunlight is directly taken in through the dome cover, the emission direction of the sunlight is greatly affected by the altitude and direction of the sun. There is a problem that the emission direction is not stable.

In particular, in the morning and evening when the solar altitude is low, in the light guide path, the emission direction of the sunlight is reversed depending on whether the number of times of reflection on the light guide wall is an odd number or an even number, and the brightness at a certain point in the room is increased. It changes rapidly.

Further, in the conventional daylighting device, although the sunlight is diffused to some extent by the light distribution plate, the directivity of the sunlight cannot be remarkably reduced, and the sunlight is strongly irradiated locally, and There was also the problem of insufficient lighting at the corners.

As a countermeasure, a light-collecting device in which a predetermined amount of an opacifying agent is mixed in a dome cover to make the dome cover a white scatterer in order to reduce the directivity of sunlight of the conventional light-collecting device may be considered.

[0013] However, if the dome cover is made of a white scatterer, although a certain degree of uniform sunlight can be collected, the sunlight is reflected out of the lighting device when passing through the dome cover. There is a problem that the amount of collected light is reduced when the amount of light is insufficient.

It is an object of the present invention to provide a daylighting device capable of reducing the directivity of sunlight and emitting uniform light and suppressing a decrease in the amount of light.

[0015]

According to a first aspect of the present invention, there is provided a lighting device according to the present invention.
A lighting port for collecting sunlight, a light guide path for guiding the sunlight to the room, an emission port for irradiating the sunlight to the room, and a light-emitting port provided on the lighting port, the surface of the transparent member By forming some or all of the fine irregularities,
And a lighting cover as a light-transmitting diffuser.

With this configuration, the sunlight is diffused due to the minute unevenness formed on the surface of the lighting cover, and as a result, the directivity of the sunlight is relaxed, so that uniform sunlight can be taken. .

Further, since a transparent member is used as the material of the daylighting cover, the amount of sunlight reflected outside the daylighting device can be reduced, and a decrease in the amount of daylighting can be suppressed.

According to a second aspect of the present invention, there is provided a daylighting device, comprising: a daylighting port for lighting sunlight; and a light guide path formed by a light guide wall having a wall formed on a light reflecting surface to guide the sunlight into a room. An emission port configured to irradiate the sunlight indoors,
A light-receiving cover provided as a light-transmitting diffuser by being provided in the light-receiving opening and forming part or all of the surface of the transparent member into fine irregularities.

With this configuration, it is possible to collect uniform sunlight having a reduced directivity as described above, and to suppress light absorption in the light guide path by using the light guide wall as a light reflecting surface. Therefore, it is possible to further suppress a decrease in the amount of collected light.

According to a third aspect of the present invention, the light-receiving device has a configuration in which fine or substantially polygonal pyramids or hemispherical projections are formed on part or all of the surface of the light-receiving cover to have an uneven shape.

When the uneven shape formed on the surface of the daylighting cover is specifically set as described above, the sunlight can be appropriately diffused, and the degree of diffusion of the sunlight can be appropriately adjusted by adjusting the uneven shape. Can be easily changed.

According to a fourth aspect of the present invention, in the lighting device, a fine granular transparent body is attached to a part or the whole of the surface of the lighting cover so as to have an uneven shape.

In this case, for example, a transparent body is attached only to a desired position and a diffusion action is provided only at a specific portion of the daylighting cover, or the density of the transparent body is changed by changing the density of the transparent body. It becomes easy to change the degree of diffusion, and the mode of use of the daylighting device can be expanded.

According to a fifth aspect of the present invention, in the lighting device, an irregular transparent resin sheet is attached to a part or all of an inner surface of the lighting cover to have an irregular shape.

With this configuration, the daylighting cover can be easily formed as a light-transmitting diffuser simply by attaching a transparent resin sheet, so that the manufacturing cost of the daylighting device can be reduced.

According to a sixth aspect of the present invention, in the lighting device, only the inner surface of the lighting cover is formed in an uneven shape, and the outer surface is formed to be substantially flat.

With this configuration, the inside surface of the daylighting cover having a complicated shape can be isolated from the outside air, so that it is possible to prevent an increase in maintenance work due to the adhesion of dust and dirt.
In addition, since the outer surface is made substantially flat, maintenance work is facilitated, and the maintenance cost of the lighting device can be reduced.

According to a seventh aspect of the present invention, in the daylighting apparatus, the inner surface of the light guide path is covered with a prism sheet so that the sunlight is refracted in the direction of the light exit.

With this configuration, every time the sunlight is reflected on the inner surface of the light guide path, the number of reflections is reduced because the sunlight is directed toward the exit port by the refraction of the prism, and the distance of the light passing through the light guide path is reduced. In particular, it is possible to suppress a decrease in the amount of light collected at low sun altitudes, such as in winter and morning and evening, and a decrease in the amount of light collected when the distance of the light guide path is long.

The daylighting device according to claim 8 is configured such that acrylic resin or polycarbonate is used as a material of the transparent member of the daylighting cover.

With such a configuration, it is lightweight and inexpensive,
A light-receiving cover having excellent durability can be obtained, and is a suitable material as a transparent material used for a light-receiving cover of a light-receiving device.

The daylighting device according to the ninth aspect is configured such that a photocatalytic layer of titanium oxide or the like is formed on part or all of the outer surface of the daylighting cover.

With such a configuration, the dirt attached to the outer surface of the lighting cover is decomposed into a component easily soluble in water by the strong oxidizing action of the photocatalyst which has absorbed the ultraviolet light contained in sunlight, and the accumulation of dirt on the lighting cover is reduced. Since this can be prevented, a decrease in the amount of collected light over a long period of time can be suppressed, and maintenance becomes easy.

[0034]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a daylighting device according to the present invention will be described with reference to FIGS.

FIG. 1 is a longitudinal sectional side view showing an embodiment of a daylighting device 10 according to the present invention, and FIG. 2 is a partially enlarged side view of FIG.

In FIGS. 1 and 2, the same components as those shown in FIG. 4 are denoted by the same reference numerals, and description thereof is omitted.

First, a schematic configuration of the daylighting device 10 of the present embodiment will be described with reference to FIGS.

As shown in FIG. 1, the basic configuration of the daylighting device 10 of this embodiment is substantially the same as that of the conventional daylighting device 50 shown in FIG.
The dome-shaped daylighting cover (hereinafter referred to as “dome cover”) 20 that blocks the daylighting device 10 from the outside air is characterized by a light-transmitting diffuser. The dome cover 20 used in the daylighting device 10 of the present embodiment uses a transparent material such as an acrylic resin or polycarbonate, and has minute hemispherical protrusions on the inner surface 20a as shown in FIG. By arranging a large number in a shape, it is formed in an uneven shape, and is configured to be a light transmitting diffuser. On the other hand, the outer surface of the dome cover 20 has a flat shape to facilitate maintenance.

Similarly to the conventional daylighting device 50, the light guide wall 66 has a light reflecting surface by forming the inner wall surface 66a of a white painted wall or the like, or a mirror-like light reflecting surface. Has become.

With the above configuration, the daylighting device 1 of the present embodiment
0 will be described with reference to FIG. 1 and FIG.

First, sunlight L from the sun S is applied to the dome cover 20 and passes through the dome cover 20 made of a transparent material. At this time, as described above, a large number of transparent fine hemispherical projections are formed on the inner surface 20a of the dome cover 20, and the sunlight L collected by the dome cover 20 is, as shown in FIG. According to the same principle as that of the convex lens, when the light passes through the hemispherical projection, it is temporarily focused on a focal point near the surface of the projection, and is diffused after passing through the focal point.

That is, the sunlight L is collected by the dome cover 20 and diffused when passing through the dome cover 20, so that the dome cover 20 has a function as a light transmitting diffuser.

After the diffused sunlight L passes through the dome cover 20 as shown in FIG. 1, it passes through the daylighting plate 56 provided in the daylighting opening 58 and directly enters the light distribution plate 62 via the light guide path 64. Or the light distribution plate 6 reflected once or plural times
2 and is scattered to some extent by the light distribution plate 62 and is collected indoors.

At this time, since the sunlight L is diffused by the dome cover 20, the directivity originally possessed by the sunlight L is greatly reduced, and is greatly influenced by the altitude and the position of the sun S. Irradiation with uniform intensity at all times In addition, as a result, it is not necessary to locally irradiate the room strongly, and the light can be uniformly illuminated including the interior of the room.

Further, since the uneven surface is formed only on the inner surface 20a of the dome cover 20 and the outer surface is made flat like the conventional lighting device 50, the inner surface 2
The outer surface 0a is hardly contaminated by being shut off from the outside air, while the outer surface that is exposed to the outside air and to which the contaminants easily adhere becomes easy to maintain and can suppress an increase in the maintenance cost of the daylighting device 10.

Furthermore, the inner wall surface 6 of the light guide wall 66 of the light guide path 64
Since 6a is a light reflecting surface or a mirror-like light reflecting surface,
Since the absorption of the sunlight L at the time of reflection by the light guide wall 66 can be suppressed as much as possible, it is possible to provide the lighting device 10 in which the decrease in the amount of sunlight L collected is suppressed.

The daylighting device of the present invention is not limited to the above embodiment, but can be variously modified.

For example, in the above-described embodiment, an example has been described in which hemispherical projections are densely arranged on the inner surface of the dome cover to form irregularities. However, this is a polygonal pyramid shape such as a triangular pyramid or a quadrangular pyramid. It may be replaced with a projection.

Similarly, in addition to forming the inner surface of the dome cover in an uneven shape, as shown in FIG.
A large number of granular transparent members 24 may be attached to a part or the entirety of the inner surface 22a by printing or coating a transparent adhesive to provide a light diffusing effect.

Further, by covering the light guide wall with a prism sheet and utilizing the refraction effect of the prism sheet so as to be directed to the exit port each time sunlight is reflected by the light guide wall, the light guide wall can be obtained. As the number of reflections on the light guide decreases, the distance passing through the light guide path is shortened, so that the attenuation of sunlight in the light guide path can be suppressed, and the reduction in the amount of collected light can be suppressed.

In the above embodiment, the inner surface of the dome cover is formed to have irregularities. However, a transparent resin sheet having an uneven surface is attached to the inner surface of the dome cover, so that the inner surface of the dome cover is formed. Of course, the inner surface may be made uneven.

[0052]

The daylighting device of the present invention has the following excellent effects because it is configured as described above. (1)
As described in claim 1, a lighting port for collecting sunlight, a light guide path for guiding sunlight to a room, an emission port for radiating sunlight to a room, and a lighting port are provided. By forming a part or the whole of the surface of the transparent member in a fine irregular shape, a light-transmitting diffuser and a daylighting cover are provided, because of the fine irregularities formed on the surface of the daylighting cover. The sunlight is diffused, and as a result, the directivity of the sunlight is reduced, so that uniform sunlight can be taken. (2) In addition, since a transparent member is used as the material of the daylighting cover, the amount of sunlight reflected outside the daylighting device can be reduced, and a decrease in the amount of daylighting can be suppressed. (3) As described in claim 2, a light-guiding port for collecting sunlight, a light guide path whose wall surface is formed by a light-guiding wall formed on a light-reflecting surface, and guides sunlight into a room, An emission port configured to irradiate light into the room, and a lighting cover provided in the lighting port and forming a part or all of the surface of the transparent member into fine irregularities, thereby forming a light-transmitting diffuser. As described above, it is possible to collect the uniform sunlight having the reduced directivity as described above, and to suppress the absorption of light in the light guide path by using the light guide wall as the light reflecting surface. Can be further suppressed. (4) As described in the third aspect, by forming a fine substantially polygonal pyramid or a hemispherical projection on a part or the whole of the surface of the daylighting cover, the sunlight can be diffused favorably. Further, the degree of diffusion of sunlight can be easily changed by adjusting the uneven shape. (5) As described in claim 4, when a fine granular transparent body is attached to part or all of the surface of the daylighting cover to make the uneven shape, for example, the transparent body is attached only to a desired position. It is easy to change the degree of diffusion of sunlight by providing a diffusion function only in a specific portion of the daylighting cover or by changing the density of the transparent body, thereby expanding the usage of the daylighting device. be able to. (6) As described in the fifth aspect, when the uneven surface is formed by attaching an uneven transparent resin sheet to part or all of the inner surface of the daylighting cover, the transparent resin sheet can be easily attached only by attaching the transparent resin sheet. Since the daylighting cover can be a light-transmitting diffuser, the manufacturing cost of the daylighting device can be reduced. (7) As described in claim 6, when only the inner surface of the daylighting cover is formed in an uneven shape and the outer surface is formed to be substantially flat, the inner surface of the daylighting cover having a complicated shape is isolated from the outside air. Therefore, it is possible to prevent the maintenance work from increasing due to the adhesion of dust and dirt. In addition, since the outer surface is made substantially flat, maintenance work becomes easier, and the maintenance cost of the daylighting device can be reduced. (8) As described in claim 7, when the inner surface of the light guide path is covered with the prism sheet so that the sunlight is refracted in the direction of the exit port, every time the sunlight is reflected on the inner surface of the light guide path. , The number of reflections is reduced because the sunlight is directed toward the exit port by the refraction of the prism, and the distance that passes through the light guide path is shortened. And the reduction in the amount of light collected when the distance of the light guide path is long can be suppressed. (9) As described in claim 8, when an acrylic resin or polycarbonate is used as the material of the transparent member of the daylighting cover, the daylighting cover can be made lightweight, inexpensive, and excellent in durability. It is a suitable material as a transparent material used for a lighting cover of the device. (10) As described in claim 9, when a photocatalyst layer such as titanium oxide is formed on a part or the whole of the outer surface of the daylighting cover, the strong oxidizing action of the photocatalyst absorbing the ultraviolet rays contained in sunlight. Since the dirt attached to the outer surface of the lighting cover is decomposed into water-soluble components and the accumulation of dirt on the lighting cover can be prevented, a decrease in the amount of light for a long period can be suppressed and maintenance can be facilitated.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing an embodiment of a daylighting device of the present invention.

FIG. 2 is a partially enlarged side view of FIG. 1;

FIG. 3 is an essential part enlarged side view for explaining another embodiment of the daylighting device of the present invention.

FIG. 4 is a vertical sectional side view showing a schematic configuration of a conventional daylighting device.

[Explanation of symbols]

 10: Daylighting Device 20, 22: Dome Cover (Daylighting Cover) 20a, 22a: Dome Cover Inner Surface 24: Granular Transparent Body 58: Lighting Port 60: Outlet Port 64: Light Guide Path 66: Light Guide Wall 66a: Inner Wall L: Sun light

Continued on the front page (72) Inventor Kaori Nagashima 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Kazuhiro Tajima 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Inside Sanyo Electric Co., Ltd. (72) Inventor Toshihiro Tanaka 2-5-5 Keihanhondori, Moriguchi City, Osaka Prefecture Inside Sanyo Electric Co., Ltd. (72) Inventor Shinya Yamamoto 2-5-2 Keihanhondori, Moriguchi City, Osaka Prefecture No. 5 Sanyo Electric Co., Ltd. (72) Inventor Yu Senkinraku 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd.

Claims (9)

[Claims] 1. A lighting port for collecting sunlight, a light guide path for guiding the sunlight into a room, an emission port for irradiating the sunlight to a room, and provided in the lighting port, A daylighting device, comprising: a daylighting cover formed as a light-transmitting diffuser by forming a part or the whole of a surface of a transparent member into fine irregularities. 2. A lighting port for taking in sunlight, a light guide wall having a light guide wall having a wall surface formed on a light reflecting surface, and a light guide path configured to guide the sunlight into a room; An emission port configured to irradiate, and a lighting cover provided as a light-transmitting diffuser, provided in the lighting port, and forming a part or the entire surface of the transparent member into fine irregularities. A lighting device, characterized in that: 3. The daylighting device according to claim 1, wherein the surface of the daylighting cover is formed into a concavo-convex shape by forming fine substantially polygonal pyramids or hemispherical projections on a part or the entire surface. . 4. The daylighting device according to claim 1, wherein a fine granular transparent body is attached to a part or the whole of the surface of the daylighting cover to form an uneven shape. 5. The daylighting device according to claim 1, wherein an uneven transparent resin sheet is attached to a part or all of an inner surface of the daylight cover to form an uneven shape. 6. The daylighting device according to claim 1, wherein only the inner surface of the daylight cover is formed in an uneven shape, and the outer surface is formed to be substantially flat. 7. The daylighting device according to claim 1, wherein a prism sheet is coated on an inner surface of the light guide path so that the sunlight is refracted in a direction of an emission port. 8. The daylighting device according to claim 1, wherein an acrylic resin or polycarbonate is used as a material of the transparent member of the daylighting cover. 9. The daylighting device according to claim 1, wherein a photocatalytic layer of titanium oxide or the like is formed on a part or all of the outer surface of the daylighting cover.