JPH11202255A - Natural lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a natural lighting device in which reduction in the natural lighting efficiency for the sunlight is suppressed to the minimum and a light stabilized in emitting direction can be obtained. SOLUTION: This device 10 is constituted by providing a natural lighting port 43 for taking sunlight L, a dome cover 12 provided at this natural lighting port 43, a light guiding path 44 or guiding the sunlight L into a room by surrounding it with a light guiding wall 45 forming a wall surface 45a as a light reflecting plane, emission port 47 for irradiating the inside of the room with the sunlight L, and a transmission diffusion plate 48 provided at this emission port 47. In this case, a prism for enlarging an apex angle gradually from the top to the peripheral edge part is formed on the dome cover 12, and the advancing direction of sunlight 1 taken by the dome cover 12 is curved wide gradually from the top to the peripheral edge part in the lengthwise direction of the light guiding path 44.

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 In a conventional lighting device, a transparent dome, a dome-shaped milky white light scatterer, or a flat glass plate is attached to a lighting opening provided on a roof of a building or the like, and sunlight passing through these is illuminated with white light. Sunlight is guided indoors through a light guide path constituted by a light guide wall made of a cross-coated or white painted wall or a light guide wall having a mirror-like reflective surface.

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

FIG. 4 is a longitudinal sectional side view showing the structure of a conventional lighting device. As shown in FIG.
It is installed on the roof 30 of the building or the like.
Is a dome-shaped cover (hereinafter, referred to as a “dome cover”) attached to a lighting port 43 provided above the roof 30 for taking in sunlight L and blocking indoors and outside air. A lighting plate 46 is attached below the dome cover 42.

[0005] The light guide path 44 is constituted by surrounding the periphery with a light guide wall 45 having a wall surface 45 a formed on the light reflecting surface, and extends from above the roof 30 to the indoor side of the ceiling 32.
It is provided so that sunlight L can be guided indoors. Further, a transmission diffusion plate 48 is attached to the exit 47 of the sunlight L.

The light guide wall 45 used in the conventional daylighting device 40 may be made of a white painted wall or a light guide wall 4.
5 is provided with a white cloth on the wall surface 45a. Further, as the light guide wall 45, a transparent protective film is formed on the surface of a metal surface, or a reflective plate having a mirror-like reflective surface by providing a metal film on the surface of a transparent sheet is used. There is also.

With the above configuration, the sunlight L collected from the dome cover 42 passes through the light collection plate 46 and then enters the light guide path 44 at various angles. At this time, the sunlight L is directly incident on the transmission / diffusion plate 48 provided at the emission port 47 depending on the incident angle, or as shown in FIG.
Is reflected once or plural times, and is incident on the transmission diffusion plate 48;
The light is guided into the room through the transmission diffusion plate 48.

[0008]

By the way, in the above-mentioned conventional daylighting device, for example, when sunlight is taken when the altitude is low, as shown in FIG. Because it is incident, the wall surface 4 of the light guide path 44
The light 5a is reflected many times at the same reflection angle, and is guided into the room from the transmission / diffusion plate 48 of the emission port 47.

However, the wall surface 45a of the light guide path 44 is formed on the light reflecting surface. In particular, when the light guide wall 45 is painted white or is made of white cloth, the light guide wall 45 is formed on the wall surface 45a. It is absorbed each time it is reflected,
The amount of sunlight L is gradually attenuated.

Further, even when a reflector having a mirror-like reflection surface is used for the light guide wall 45, the path of the sunlight L becomes longer and is reflected many times on the wall surface 45a of the light guide path 44. Decay.

Therefore, in the conventional daylighting device 40, the amount of sunlight L that has been taken decreases, especially in the morning and evening when the sunlight L becomes weaker, or during the winter season. There was a problem of reduction.

On the other hand, if the number of reflections on the wall surface of the light guide path is large, a slight change in the altitude of the sun greatly changes the emission angle of sunlight into the room, or the direction of emission is reversed. In addition, there has been a problem that the direction of the light emitted from the transmission diffusion plate is not stable, and the light amount locally largely fluctuates.

SUMMARY OF THE INVENTION An object of the present invention is to provide a daylighting apparatus capable of minimizing a reduction in daylighting efficiency and obtaining light with a stable emission direction.

[0014]

According to the lighting device of the present invention,
In order to solve the above-mentioned problem, according to the first aspect, a lighting port for lighting sunlight, a dome-shaped cover provided in the lighting port, and a light guide wall having a wall surface formed as a light reflecting surface. And a light guide path configured to guide the sunlight into the room, an emission port configured to irradiate the sunlight into the room, and a transmission / diffusion plate provided in the emission port. In the cover, the apex angle of the prism on the zenith side is formed to be larger than the apex angle of the prism on the peripheral part, and the traveling direction of the sunlight collected on the peripheral part side of the cover is collected on the zenith side. It was configured to bend greatly in the longitudinal direction of the light guide path as compared with the traveling direction of the sunlight.

With this configuration, the direction of sunlight is greatly bent from the zenith to the peripheral edge in the longitudinal direction of the light guide path due to the refraction of the prism, so that the sunlight directly reaches the transmission diffusion plate provided at the exit. Therefore, the sunlight is not reflected on the wall surface of the light guide path, and the path of the sunlight is shortened. Therefore, it is possible to provide a lighting device in which attenuation of the light amount is suppressed as much as possible.

Further, since the direction of sunlight is aligned with the longitudinal direction of the light guide path, light with a stable emission direction can be obtained.

In the daylighting device according to the present invention, the light-receiving port for receiving sunlight, a dome-shaped cover provided in the light-receiving port, and a light-guiding wall whose wall surface is formed as a light reflecting surface are provided. A light guide path configured to guide the sunlight into a room, an emission port configured to irradiate the sunlight into the room, and a lighting device including a transmission diffusion plate provided in the emission port; In addition, the apex angle of the prism on the zenith side is formed so as to be gradually larger than the apex angle of the prism on the peripheral part, and the traveling direction of sunlight collected by the cover is
The light guide path was configured to bend gradually greatly from the zenith to the peripheral edge in the longitudinal direction.

With this configuration, the refraction of the prism allows the direction of the sunlight to be gradually greatly bent from the zenith to the periphery in the longitudinal direction of the light guide path, thereby providing a daylighting device that is finely adapted to the solar altitude. be able to.

In the daylighting device according to the third aspect of the invention, the daylighting opening for receiving sunlight, a dome-shaped cover provided in the daylighting opening, and the light guide wall whose wall surface is formed as a light reflecting surface are surrounded. A light guide path configured to guide the sunlight into a room, an emission port configured to irradiate the sunlight into the room, and a lighting device including a transmission diffusion plate provided in the emission port; On the inner surface of the prism, a prism whose vertex angle gradually increases from the zenith to the peripheral portion is formed, and the traveling direction of sunlight collected by the cover is gradually bent from the zenith to the peripheral portion in the longitudinal direction of the light guide path. did.

With this configuration, similarly to the above, there is an effect that the attenuation of the light amount is suppressed as much as possible and light with a stable emission direction is obtained. In addition, by providing the prism on the inner surface of the cover, the prism surface is hardly stained, Maintenance work is reduced, and maintenance costs can be reduced.

According to the daylighting device of the present invention, the light-receiving port for receiving sunlight, a dome-shaped cover provided in the light-receiving port, and a light-guiding wall whose wall surface is formed as a light-reflecting surface are provided. A light guide path configured to guide the sunlight into a room, an emission port configured to irradiate the sunlight into the room, and a lighting device including a transmission diffusion plate provided in the emission port; On the inner surface of the prism, a prism whose apex angle gradually increases from the zenith to the periphery is formed concentrically,
The traveling direction of the sunlight collected by the cover is configured to gradually bend from the zenith to the periphery in the longitudinal direction of the light guide path.

As described above, by forming the prisms concentrically, the processing of the dome-shaped cover is simplified,
The manufacturing cost of the lighting device can be reduced.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a daylighting device according to the present invention will be described with reference to FIGS. 1 to 3A and 3B.

In FIGS. 1 to 3A and 3B, the same components as those of the conventional daylighting device 40 shown in FIG. 4 are denoted by the same reference numerals as those in FIG. I do.

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

FIGS. 2A and 2B are diagrams showing the manner in which the angle of refraction of light differs depending on the magnitude of the apex angle of the prism.
(A) shows a prism with a small apex angle, and (B) shows a prism with a large apex angle.

On the other hand, FIGS. 3A and 3B are schematic structural views showing the structure of a dome cover used in the daylighting device of the present invention. FIG. 3A shows a side view and FIG. .

As shown in FIG. 1, the daylighting device 10 of the present embodiment has the same basic structure as the conventional daylighting device 40 shown in FIG. As shown in FIGS. 3A and 3B, a prism having a gradually increasing apex angle is formed concentrically on the inner surface 12a of the inner surface 12a from the zenith to the peripheral portion.

The dome cover 12 may be made of a transparent material such as a resin, although a milky material is effective.

As described above, the inner surface 12 of the dome cover 12
When a prism is formed on a, as shown in FIG.
When the apex angle α is large, the refraction angle of the sunlight L is large. On the other hand, as shown in FIG. 2A, when the apex angle α is small, the refraction angle of the sunlight L becomes small. The sunlight L incident on the peripheral portion is refracted at a large angle, and the sunlight L incident near the zenith of the dome cover 12 is refracted at a small angle.

With the above configuration, the sunlight L taken from the dome cover 12 is taken mainly from the peripheral portion of the dome cover 12 when the solar altitude is low, as shown by S1 in FIG. Thus, the light is refracted in the longitudinal direction of the light guide path 44 at a large angle, and is largely bent in the direction of the light exit of the lighting device 10 as shown in FIG.

On the other hand, when the sun altitude is high as shown by S2 in FIG. 1, the light is mainly taken from the vicinity of the zenith of the dome cover 12, so that the light is refracted in the longitudinal direction of the light guide path 44 at a small angle as described above. The lighting device 1 as shown in FIG.
It is bent slightly in the direction of the exit of zero.

Accordingly, the angle of refraction of the dome cover 12 at the time of daylighting increases or decreases in accordance with the level of the sun altitude. Of sunlight L can be collected.

Therefore, even when the sun altitude is low, such as in the morning and evening or in winter, as compared with the conventional one, the wall surface 45a of the light guide path 44
The light directly reaches the transmission diffusion plate 48 of the emission port 47 without being reflected by the light exit port 47, and a decrease in the amount of light can be prevented.

In addition, since the path of the sunlight L becomes short,
A decrease in the amount of light due to scattering by air can also be suppressed, and therefore, a reduction in the efficiency of collecting sunlight L can be prevented.

Furthermore, since the incident angle of the sunlight L to the transmission / diffusion plate 48 also becomes uniform in the longitudinal direction of the light guide path 44, the emitted light becomes almost parallel to the longitudinal direction of the light guide path 44, and the emission direction is stabilized. .

On the other hand, by forming a prism on the inner surface 12a of the dome cover 12, the prism surface is less likely to be soiled, maintenance work is reduced, and maintenance costs can be reduced. Further, by forming the prisms concentrically, the processing of the dome cover 12 is simplified, and the manufacturing cost of the daylighting device 10 can be reduced.

The daylighting device of the present invention is not limited to the one described in the above embodiment, and various changes can be made.

For example, FIGS. 3A and 3B show diagrams in which a prism is provided on the inner surface 12a of the dome cover 12. FIG.
The shape of each prism is not limited to this embodiment, and various changes can be made according to the shape of the dome cover 12 and the like.

In a case where the daylighting device 10 is used in a place where the possibility of contamination of the prism is low, a prism may be formed on the outer surface of the dome cover 12.

[0041]

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, it is constituted by surrounding a light-receiving port for taking in sunlight, a dome-shaped cover provided in the light-receiving port, and a light guide wall whose wall surface is formed as a light reflecting surface. In a lighting device including a light guide path for guiding sunlight into a room, an emission port for irradiating sunlight to a room, and a transmission / diffusion plate provided in the emission port, a zenith-side prism is provided on a cover. Is formed to be larger than the vertex angle of the prism on the peripheral edge, and the traveling direction of sunlight collected on the peripheral side of the cover is compared with the traveling direction of sunlight collected on the zenith side. If it is configured to bend greatly in the longitudinal direction of the light guide path, the direction of sunlight is greatly bent from the zenith to the periphery in the longitudinal direction of the light guide path due to the refraction of the prism, and directly reaches the transmission diffusion plate provided at the exit. The sunlight Without being reflected on the wall surface of the optical path, since the path of sunlight is reduced, it can be minimized with lighting apparatus attenuation of light intensity. (2) Further, since the direction of sunlight is aligned with the longitudinal direction of the light guide path, light with a stable emission direction can be obtained. (3) As described in claim 2, the dome-shaped cover is formed such that the vertex angle of the prism on the zenith side is gradually larger than the vertex angle of the prism on the peripheral portion, and the sunlight collected by the cover is When the traveling direction is configured to bend gradually greatly from the zenith to the peripheral portion in the longitudinal direction of the light guide path, the direction of sunlight is gradually largely bent from the zenith to the peripheral portion in the longitudinal direction of the light guide path by the refraction of the prism. Therefore, it is possible to provide a daylighting device that more precisely responds to the solar altitude. (4) When the prism is provided on the inner surface of the dome-shaped cover as described in claim 3, the prism surface is less likely to become dirty, maintenance work is reduced, and maintenance cost can be reduced. (5) As described in claim 4, by forming the prism concentrically, the processing of the dome-shaped cover is simplified, and the manufacturing cost of the daylighting device can be reduced.

[Brief description of the drawings]

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

FIGS. 2A and 2B are diagrams showing how the angle of refraction of light varies depending on the magnitude of the apex angle of the prism. FIG. 2A shows a prism having a small apex angle, and FIG. 2B shows a case of a prism having a large apex angle. .

FIGS. 3A and 3B are schematic configuration diagrams showing the structure of a dome cover used in the daylighting device of the present invention, wherein FIG. 3A shows a side view and FIG.

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

[Explanation of symbols]

 10: Lighting device of the present invention 12: Dome cover (dome-shaped cover) 12a: Inner surface of dome cover 43: Lighting opening 44: Light guide path 45: Light guide wall 45a: Wall surface of light guide path 47: Exit port 48: Transmission diffuser plate L: sunlight

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akira Konogi 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Shozo Kato 2-chome, Keihanhondori, Moriguchi-shi, Osaka No. 5 Sanyo Electric Co., Ltd.

Claims (4)

[Claims] 1. A light-receiving port for receiving sunlight, a dome-shaped cover provided in the light-receiving port, and a light guide wall whose wall surface is formed as a light reflecting surface. A light guide path configured to guide the light to the room, an emission port configured to irradiate the sunlight into the room, and a transmission diffuser provided at the emission port. The angle is formed so as to be larger than the apex angle of the prism at the peripheral portion, and the traveling direction of the sunlight collected on the peripheral portion side of the bar is smaller than the traveling direction of the sunlight collected at the zenith side. A daylighting device characterized in that it is largely bent in the longitudinal direction of an optical path. 2. A light-receiving port for receiving sunlight, a dome-shaped cover provided in the light-receiving port, and a light guide wall whose wall surface is formed as a light reflecting surface. A light guide path configured to guide the light to the room, an emission port configured to irradiate the sunlight into the room, and a transmission diffuser provided at the emission port. The angle is formed so as to be gradually larger than the vertex angle of the peripheral prism, and the traveling direction of the sunlight collected by the cover is configured to gradually bend from the zenith to the peripheral portion in the longitudinal direction of the light guide path. Lighting device characterized. 3. A light-receiving port for receiving sunlight, a dome-shaped cover provided in the light-receiving port, and a light-guiding wall whose wall surface is formed as a light-reflecting surface. A light guide path configured to guide light to the room, an emission port configured to irradiate the sunlight into the room, and a light-transmitting device including a transmission diffusion plate provided in the emission port. A prism having an apex angle gradually increasing toward, and the traveling direction of sunlight collected by the cover is gradually bent from the zenith to the periphery in the longitudinal direction of the light guide path. 4. A light-receiving port for receiving sunlight, a dome-shaped cover provided in the light-receiving port, and a light-guiding wall whose wall surface is formed as a light-reflecting surface. A light guide path configured to guide light to the room, an emission port configured to irradiate the sunlight into the room, and a light-transmitting device including a transmission diffusion plate provided in the emission port. A prism whose apex angle gradually increases toward the center is formed concentrically, and the traveling direction of sunlight collected by the cover is gradually bent from the zenith to the periphery in the longitudinal direction of the light guide path. Lighting device.