JPH11281912A - Lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device which has the work cost and the production cost reduced by suppressing the reduction of the quantity of light of solar rays and reducing the labor of installation work. SOLUTION: With respect to a lighting device 10 provided with a light intake port 58 to take in solar rays, a light transmission line 64 through which solar rays are transmitted into a room, and an outlet port from which the inside of the room is irradiated with solar rays, a reflection duct 20 is attached which is freely contracted and expanded in the exit port direction of the light transmission line 64 to have the length adjusted and is provided with a light distribution plate 14 which diffuses light to an aperture part 16, and a solar ray intake device 70 is provided. Since the reflection duct 20 is used which consists of plural reflection units 22a to 22d provided with inner surfaces which are formed so as to be light reflection surfaces like specular surfaces, mass production of reflection units 22a to 22d is possible to reduce the production cost of the lighting device 10.

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 Hereinafter, as a prior art, a daylighting device using a single daylighting device, and a daylighting device having a configuration in which a daylighting device with a built-in daylighting prism described later is attached instead of the daylighting device will be described with reference to FIGS. 7 will be described.

[0003] First, a description will be given of an apparatus using a lighting device alone.

In this conventional daylighting device, a transparent dome, a dome-shaped milky white light scatterer, or a flat glass plate is attached to a daylighting opening provided on a roof of a building or the like, and sunlight transmitted through these is illuminated with white light. The sunlight is guided into the room through a light guide path formed 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.

[0005] This conventional daylighting device will be described with reference to FIG.

FIG. 5 is a vertical sectional side view showing the structure of a conventional daylighting device 50. As shown in FIG.
Attaches the gantry 44 to the building roof 40 or the like,
It is installed on the basis of.

In FIG. 5, 52 is attached to a lighting port 58 provided above the roof 40 to take in sunlight L from the sun S and to project upward to block indoor air from outside air. It has a shape, for example, a dome-shaped cover (hereinafter referred to as a “dome cover”). A lighting plate 56 is arranged below the dome cover 52.

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 reflecting surface around the light guide wall 66. Light guiding path 6
A light distribution plate 62 for diffusing the sunlight L is attached to the exit 60 of the fourth light source.

The light guide wall 66 used in the conventional daylighting device 50 may be 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 and
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
The light enters the light exit port 60 or, as shown in FIG.
6 is reflected once or on the inner wall surface 66a, or a plurality of times (not shown), and is guided indoors.

When the sunlight L is guided into the room, 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. 5, and the room is illuminated uniformly.

Next, the lighting device 5 shown in FIG.
6, a daylighting device 50A having a configuration in which a daylighting daylighting device 70 with a built-in daylighting prism is attached,
This will be described with reference to FIGS.

FIGS. 6A and 6B are diagrams showing a schematic configuration of the solar lighting device 70, wherein FIG. 6A is a plan view and FIG.

FIG. 7 is a vertical sectional side view showing the entire structure of a daylighting device 50A to which the sunlight daylighting device 70 is attached.

In FIGS. 6A, 6B and 7, the same components as those in FIG. 5 are denoted by the same reference numerals.

In FIGS. 6A and 6B, 72a, 7
2b is a lighting prism, 76 is a lighting prism 72a,
72b is a rotary drive device, and 78 is a daylighting prism 72a, 7
Reference numeral 74 denotes a light distribution plate, 82 denotes an inner frame (frame), 84 denotes an outer frame, and 86 denotes a solar cell.

The sunlight L transmitted through the dome cover 52 and applied to the two daylighting prisms 72a and 72b arranged at a predetermined interval is separated from the daylighting prisms 72a and 72b.
The light is refracted at a suitable angle by the refraction action of the light 72 b and guided into the building room via the light distribution plate 74.

On the other hand, although not shown, the rotation driving device 76 for the daylighting prisms 72a and 72b, a gear mechanism including a driving gear, an electric motor, a control device for controlling the electric motor, and a setting device for giving a control command to the control device And so on,
First, a detection output from a sunlight state detection device (not shown) for detecting a state such as the altitude and direction of the sun is provided to a setting device.

Next, in response to a drive command of the setting device, a control signal of the control device causes the motor to drive through a motor and a gear mechanism.
The daylighting prisms 72a and 72b are rotated, and their rotation positions are adjusted so that the sunshine can always be taken at a suitable angle. At this time, the solar battery 86 is a power supply source for driving the electric motor.

The daylighting prisms 72a and 72b are connected to a plurality of bearing rollers 88a to 88 via a rotating ring 78.
It is rotatably supported by f.

FIG. 7 shows a method of lighting sunlight L by the lighting device 50A using the sunlight lighting device 70 with the above configuration.
This will be described with reference to FIG.

FIG. 7 shows a state in which the daylighting device 70 is attached to the daylighting opening 58 of the daylighting device 50 shown in FIG. 5, and as shown in FIG. The sunlight L that has passed through the dome cover 52 and the lighting plate 56 enters the lighting prisms 72a and 72b.

As shown by S1 in FIG. 7, when the solar altitude is low, sunlight L enters the upper daylighting prism 72a at a low incident angle, and the light exit 60 of the daylighting device 50 is refracted by the daylighting prism 72a. It is further bent in the direction by the light collecting prism 72b at the lower stage, is further bent in the direction of the light exit 60, directly enters the light distribution plate 62, is diffused by the light distribution plate 62, and is radiated indoors.

On the other hand, even when the solar altitude is high as shown in S2, the sunlight L directly enters the upper and lower lighting prisms 72a and 72b at a high incident angle, is bent in the direction of the exit 60, and is directly distributed. The light enters the light plate 62, is diffused into the light distribution plate 62 in the same manner as described above, and is radiated indoors.

For this reason, in the case of the daylighting device 50A using the daylighting daylighting device 70, in a general residential house, the sunlight L can be always taken at a suitable angle in the daytime, and no lighting equipment is necessary or weak lighting is sufficient. It contributes to energy saving.
On the other hand, since natural light can always be irradiated to a plant at a suitable angle, application to a plant plant has also been attempted, and certain results such as promotion of growth or improvement of taste have been obtained.

[0026]

By the way, in the above-mentioned conventional daylighting device, when a white cross-coated inner wall surface is used as the light guide wall of the light guide path, the collected sunlight is reflected on the inner wall surface. Each time it is performed, the light is absorbed and diffused by the light guide wall, and the number of reflections increases, especially in morning and evening or winter when the solar altitude is low.

On the other hand, in the case of a daylighting device in which the daylighting daylight device is attached to the daylighting opening, the sunlit daylight is bent in the direction of the light exiting port by the refraction of the daylighting prism as described above. Although the light is not reflected on the inner wall surface, but does not pass through the lighting prism, it is reflected on the inner wall surface of the light guide wall, so that there is a problem that a decrease in the amount of light is unavoidable as a whole.

Further, in the case of a daylighting device using a light guide having an inner wall surface formed as a mirror-like light reflecting surface, although a decrease in the amount of sunlight can be suppressed to some extent, a work for attaching a reflector around the light guide is required. When the length of the light guide path is long, there is a problem that the mounting work becomes excessive.

In particular, since the length of the light guide path differs depending on the building in which the lighting device is installed, the working efficiency is reduced, the operating cost is increased, and it is difficult to standardize and mass-produce the reflector. However, there is a problem that the manufacturing cost increases.

An object of the present invention is to provide a daylighting apparatus in which a decrease in the amount of sunlight is reduced, labor for installation work is reduced, work costs are reduced, and manufacturing costs are reduced.

[0031]

According to the lighting device of the present invention,
In order to solve the problem, according to the first aspect of the present invention, a lighting opening for lighting sunlight, a light guide path configured to guide the sunlight into a room, and irradiating the sunlight to a room are provided. And a reflecting duct formed so as to be adjustable in length so as to be extendable and contractible in the direction of the exit of the light guide path.

With this configuration, the work of attaching the reflecting duct is reduced, the working efficiency is improved, and the cost of attaching the lighting device can be reduced.

Further, even if the length of the light guide path is different, the length can be easily adjusted by expansion and contraction of the reflecting duct, so that the reflecting duct can be standardized and mass-produced. The manufacturing cost of the daylighting device can be reduced.

[0034] In the daylighting device according to the second aspect, a daylighting port for lighting the sunlight, a light guide path for guiding the sunlight into the room, and an emission port for irradiating the sunlight to the room. In the daylighting device provided with the above, the length is formed so as to be extendable and contractible in the direction of the exit of the light guide path, and a reflection duct provided with a light distribution plate for diffusing light in the opening is attached.

As described above, when the light distribution plate is attached to the reflection duct, the sunlight is diffused, glare is reduced, and uniform light can be taken in.

In addition, there is no need to attach a light distribution plate to the exit of the lighting device, and it is possible to lower the opening of the reflection duct from the exit of the lighting device to the lower surface. Since the use mode of irradiating sunlight to the sun becomes possible, the variety of uses of the daylighting device is expanded.

In the daylighting device according to the third aspect, the reflection duct is constituted by a reflection duct including a plurality of reflection units each having an inner surface formed to be a mirror-like light reflection surface.

As described above, by using the reflecting unit having the mirror-like light reflecting surface, the amount of sunlight taken from the daylighting device is increased, and the daylighting efficiency can be improved.

Further, by using a plurality of such reflecting units, only by changing the number of reflecting units,
Since the effective length of the reflecting duct can be easily changed, the utilization efficiency of the reflecting duct is improved.

Further, by standardizing and mass-producing the reflection unit, the production cost of the reflection duct can be reduced, so that the production cost of the lighting device can be further reduced.

In the daylighting device according to the fourth aspect, the daylighting device is configured to include an elevating mechanism for controlling the elevating of the opening of the reflection duct.

As described above, the provision of the raising and lowering mechanism of the reflecting duct in the lighting device makes it easy to ascend and descend the reflecting duct. So that you can adjust the
The diversity of use of the lighting device is improved.

In the daylighting device according to the fifth aspect, as the elevating mechanism for controlling the elevation of the opening of the reflecting duct, specifically, a wire for lifting the opening of the reflecting duct;
A wire winding motor for winding the wire,
A lifting mechanism having a lifting switch for controlling the motor is used.

With such an elevating mechanism, the position of the opening of the reflecting duct can be controlled with a simple configuration, so that a daylighting device with excellent use efficiency and low manufacturing cost can be obtained.

In the daylighting device according to the sixth aspect, the daylighting device may include one or more daylighting prisms, a rotation driving device that drives these daylighting prisms, and an appropriate rotation of the daylighting prism according to the position of the sun. A solar lighting device including a control device for controlling the rotation driving device so as to form an angle is provided.

As described above, if the daylighting device is provided with the daylighting device, the amount of sunlight increases, and
A daylighting device with stable emission directionality can be obtained.

[0047]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As a preferred embodiment of the daylighting device of the present invention, a daylighting device provided with a solar light daylighting device will be described with reference to FIGS.

In FIGS. 1 to 3, the same components as those of the conventional daylighting device shown in FIGS. 5 to 7 are denoted by the same reference numerals as those in FIGS. 5 to 7, and description thereof is omitted.

FIG. 1 is a longitudinal sectional side view showing an embodiment of the daylighting device of the present invention, FIG. 2A is a partially enlarged view of the daylighting device shown in FIG. 1, and FIG. FIG. 3 is a partially enlarged view showing another embodiment of the apparatus, and FIG. 3 is a longitudinal sectional side view showing a state where a reflecting duct used in a lighting device of the present invention has a maximum length.

As shown in FIG. 1, the lighting device 10 of the present invention
Is a lighting opening 58 on the roof 40 of the building, an emission opening 66 on the ceiling 42, and a ceiling 4 as in the conventional lighting device 50A shown in FIG.
6A and 6B in which a frame 44 is provided between the roof 2 and the roof 40, and the daylighting prism 58a and 72b are built in the daylighting opening 58.
Is configured to include a solar lighting device 70 shown in FIG.

In the lighting device 10 of the present invention, instead of the light guide wall 66 shown in FIG. There is a feature in the structure in the point which did.

As shown in FIGS. 1 and 3, the reflection duct 20 is composed of a plurality (four in the drawing) of reflection units 22a to 22d each having an inner surface formed as a mirror-like light reflection surface. By appropriately selecting the size of the reflection units 22a to 22d, one reflection unit, for example, 22b slides up and down along the inner surface of the other reflection unit 22a, thereby increasing the entire length of the reflection duct 20. Is adjusted.

The upper end of the uppermost reflecting unit 22a is formed in an L-shaped cross section so that the reflecting duct 20 is attached to the lighting opening 58 of the lighting device 10, and the lower end is formed of the middle reflecting unit 22b. Is formed in a hook shape in cross section to stop the vertical movement of the head.

The reflection units 22b and 22c in the middle stage
The upper end and the lower end are both formed in a hook-like cross section in a substantially S-shape in order to prevent vertical movement, and the lowermost reflection unit 22d is formed in a hook shape at the upper end for the same reason. The portion that becomes the opening 16 of the reflective duct 20 is formed in an L-shaped cross section for attaching the light distribution plate 14.

A method of attaching the above-mentioned reflecting duct 20 to the lighting device 10 with the above configuration will be described with reference to FIGS.

When attaching the reflecting duct 20 to the daylighting device 10 in this embodiment, first, the outer frame 84 of the daylighting daylighting device 70 is installed on the gantry 44, and then the uppermost reflecting unit 22a has an L-shaped cross section. Is attached to the lighting opening 58 of the lighting device 10, the remaining reflecting units 22b to 22d are gradually lowered, and the reflecting duct 20 is lowered to a position having the maximum length as shown in FIG.

Next, when the reflecting duct 20 is completely lowered, as shown by a portion A surrounded by a broken line in FIG. 1, the edge of the lower end of the lowermost reflecting unit 22d is moved to a desired position (shown in FIG. 1). In the case of an object, it is fixed to the ceiling 42).

Then, after the reflection duct 20 is attached, the main body of the sunlight collecting device 70 is attached.

The method of fixing the reflection unit 22d will be supplementarily described with reference to the enlarged views of FIGS. 2A and 2B.

That is, a portion A surrounded by a broken line in FIG.
As shown in (5), the edge of the lower end of the reflection unit 22d and the portion of the ceiling 42 facing the room are bridged by a fixing member 26 such as a picture frame, and fixed by fixing with screws 27.

Alternatively, if no decorative effect is required,
As shown in a portion A ′ surrounded by a broken line in FIG. 2B, a configuration may be employed in which the fixing member 26 is omitted with the screw 28 directly screwed to the ceiling 42 via the reinforcing member 29.

As described above, when the reflection duct 20 including the plurality of reflection units 22a to 22d having the inner surface formed as a mirror-like light reflecting surface is provided, the light guide wall having the inner wall surface cross-fitted or the like is provided. As compared with the conventional daylighting device 50 using the light guide path formed by this, the amount of sunlight absorbed on the wall surface can be reduced, so that the amount of light can be increased, and the daylighting efficiency of sunlight can be improved. it can.

Further, as described above, the work of attaching the reflection duct 20 is significantly simplified as compared with the work of attaching the light guide wall 66 in the conventional daylighting devices 50 and 50A. Is the reflection unit 22
It can be easily adjusted by moving a ~ 22d up and down,
The maximum length of the reflection duct 20 is also the reflection units 22a to 22d.
Can be easily coped with simply by increasing or decreasing the length of each of them, and the number of used reflection units 22a to 22d, and therefore, the installation work cost of the lighting device 10 can be reduced.

Further, since the reflection units 22a to 22d are standardized and mass-produced, the production cost of the reflection duct 20 itself can be reduced, which contributes to further reduction in the manufacturing cost of the lighting device 10. .

Further, as shown in FIG.
When the light distribution plate 14 is attached to the opening 16 of the lens and the length can be adjusted to extend and contract without fixing the opening 16, the sunlight is diffused by the light distribution plate 14, the glare is reduced, and the uniform light is emitted. You will be able to adopt it.

Further, the opening 16 of the reflecting duct 20 can be pulled down from the exit 60 of the daylighting device 10 to the lower surface, and the position of the opening 16 can be guided into a room to irradiate sunlight locally. Since the embodiment is also possible, the variety of uses of the daylighting device is expanded.

Further, by attaching the sunlight lighting device 70 to the lighting opening 58, the sunlight lighting device 70 is provided.
Since the above-mentioned function can be utilized, the amount of light increases and light with a stable emission direction can be obtained.

Here, the opening 1 of the reflecting duct 20
The lifting mechanism for performing the lifting and lowering of No. 6 will be supplementarily described with reference to FIG.

FIG. 4 shows the lighting device 1 shown in FIG. 1 and FIG.
0 is a vertical sectional side view showing a state in which the lifting mechanism 30 is attached to the reflection duct 20.

As shown in FIG. 4, the lifting mechanism 30
An elevating switch 32 attached to a wall surface 48 of the room 46 and controlling the elevating mechanism 30, and comprising a wire 34, a wire hoisting motor 36, and a power supply line 38.
By controlling the wire winding motor 36, the wire 34 attached to the opening 16 of the reflecting duct 20 is wound up or down to adjust the expansion and contraction of the reflecting duct 20.

As described above, when the elevating mechanism 30 is attached to the daylighting device 10 of the present invention, the reflecting duct 2
0 can be easily moved up and down, and the position of the opening 16 of the reflecting duct can be adjusted according to the amount of light and the use situation, so that the versatility of use of the lighting device 10 is improved.

The daylighting device of the present invention is not limited to the above embodiment, and various modifications are possible.

For example, in the above-described embodiment, an example has been described in which a daylighting device having a built-in daylighting prism is attached to the daylighting opening of the daylighting device. However, in place of the daylighting device, FIG. A lighting device having a configuration as shown,
That is, it goes without saying that a daylighting device configured to directly guide sunlight from a daylighting port via a reflecting duct is also included in the scope of the present invention.

Further, even when a solar lighting device is used,
A solar lighting device using a commercial power supply without a solar cell as a power supply may be used. Furthermore, the dome cover formed in a dome shape has been described as an example of a cover attached to the lighting port. However, in the lighting device of the present invention, the shape of the cover can be variously changed including a flat cover. It is.

Although the lifting mechanism has been described briefly above, the range of the daylighting device of the present invention is not affected by whether or not the lifting mechanism at the opening of the reflecting duct is attached. Needless to say.

[0076]

The daylighting device according to the present invention has the following excellent effects because it is configured as described above. (1) As described in claim 1, the lighting device includes a lighting port for collecting sunlight, a light guide path configured to guide sunlight to a room, and an emission port configured to irradiate sunlight to a room. In the lighting device, when a reflecting duct formed so that the length can be adjusted so as to be extendable and contractible in the direction of the light emitting path of the light guide path is configured to be attached, the attaching work of the reflecting duct is reduced, work efficiency is improved, and the lighting device is improved. The mounting operation cost can be reduced. (2) Even if the length of the light guide path is different, the length can be easily adjusted by the expansion and contraction of the reflecting duct, so that the reflecting duct can be standardized and mass-produced. The manufacturing cost of the daylighting device can be reduced. (3) As described in the second aspect, while being formed so that the length can be adjusted so as to be extendable and contractible in the direction of the exit opening of the light guide path,
When a reflection duct provided with a light distribution plate for diffusing light is attached to the opening, sunlight is diffused, glare is reduced, and uniform light can be taken in. (4) In addition, it is not necessary to attach a light distribution plate to the light exit of the daylighting device, and the opening of the reflection duct can be pulled down from the light exit of the daylighting device to the lower surface. Since the use mode of irradiating sunlight to the sun becomes possible, the variety of uses of the daylighting device is expanded. (5) As described in claim 3, as the reflecting duct,
When a reflection duct including a plurality of reflection units having an inner surface formed to be a mirror-like light reflection surface is used, the amount of sunlight taken from the lighting device is increased, and the lighting efficiency is improved. be able to. (6) Further, by using a plurality of such reflection units, the effective length of the reflection duct can be easily changed only by changing the number of the reflection units, so that the utilization efficiency of the reflection duct is improved. (7) Further, by standardizing and mass-producing the reflection unit, the production cost of the reflection duct can be reduced, so that the production cost of the lighting device can be further reduced. (8) As described in claim 4, when the lighting device is provided with an elevating mechanism for controlling the elevating of the opening of the reflecting duct, the elevating and lowering of the reflecting duct can be facilitated, and the amount of light to be collected and the usage of light can be improved. Since the height of the opening of the reflecting duct can be adjusted according to the situation, the versatility of the use of the lighting device is improved. (9) As described in claim 5, as a lifting mechanism for controlling the lifting and lowering of the opening of the reflecting duct, a wire for lifting the opening of the reflecting duct, a wire winding motor for winding the wire, and the motor are controlled. When configured to use a lifting mechanism having a lifting switch,
Since the position of the opening of the reflection duct can be controlled with a simple configuration, it is possible to provide a daylighting device with excellent manufacturing efficiency at low manufacturing cost. (10) As described in claim 6, when the daylighting device is configured to be provided with a sunlight daylighting device, the daylighting device can increase the amount of sunlight and stably emit light. .

[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 view of the daylighting device of the present invention, in which (A) is an enlarged view of part A of the daylighting device shown in FIG. 1, and (B) is another daylighting device different from FIG. It is a partially enlarged view which shows embodiment.

FIG. 3 is a vertical sectional side view showing a state in which a reflecting duct used in the daylighting device of the present invention has a maximum length.

FIG. 4 is a vertical sectional side view showing a schematic configuration of an elevating mechanism of an opening of a reflection duct used in the daylighting device of the present invention.

FIG. 5 is a vertical sectional side view showing a schematic configuration of a conventional daylighting device.

FIG. 6 is a diagram showing a schematic configuration of a solar lighting device, (A)
Is a plan view, and (B) is a longitudinal side view.

FIG. 7 is a vertical cross-sectional side view showing a state in which a sunlight lighting device is attached to a conventional lighting device.

[Explanation of symbols]

 10: Daylighting device 14: Light distribution plate 16: Opening 20: Reflective duct 22a to 22d: Reflection unit 30: Lifting mechanism 32: Lifting switch 34: Wire 36: Wire winding motor 58: Lighting port 60: Exit port 64: Light guide path 70: sunlight lighting device 72a, 72b: lighting prism 76: rotary drive device L: sunlight

Claims (6)

[Claims] 1. A lighting device comprising: a lighting opening for lighting sunlight; a light guide path configured to guide the sunlight into a room; and an emission opening configured to irradiate the sunlight into a room. A daylighting device, wherein a reflecting duct formed so as to be able to adjust the length so as to be extendable and contractible in the direction of an exit opening of the light guide path is attached. 2. A lighting device comprising: a lighting opening for lighting sunlight; a light guide path configured to guide the sunlight into a room; and an emission opening configured to irradiate the sunlight into a room. A daylighting device characterized in that it is formed so that its length can be adjusted to extend and contract in the direction of an exit opening of a light guide path, and that a reflection duct having a light distribution plate for diffusing light is attached to an opening. 3. The reflection duct according to claim 1, wherein the reflection duct includes a plurality of reflection units each having an inner surface formed to be a mirror-like light reflection surface. The daylighting device according to the above. 4. The daylighting device according to claim 1, wherein the daylighting device is provided with an elevating mechanism for controlling the elevation of the opening of the reflection duct. 5. An elevating mechanism for controlling the elevating of the opening of the reflective duct includes a wire for lifting the opening of the reflective duct, a wire winding motor for winding the wire, and an elevating switch for controlling the motor. 2. The apparatus according to claim 1, wherein a lifting mechanism is used.
The daylighting device according to any one of claims 1 to 4. 6. The lighting device according to claim 1, wherein one or more lighting prisms, a rotation driving device for driving these lighting prisms, and the rotation driving device driving the lighting prism so as to have an appropriate rotation angle in accordance with the position of the sun. The daylighting device according to any one of claims 1 to 5, further comprising a solar daylighting device including a control device for controlling the device.