JP2000075238A - Sunlight collecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a sunlight collecting device of a low cost which is capable of efficiently introducing the sunlight into a room even if the altitude of the sun is low. SOLUTION: This device has a light collecting section 10 for capturing the sunlight and a light introducing duct 20 for introducing the incident sunlight on this light collecting section 10 into the room and is mounted in the opening 31 of an upper wall 30 of a house. The light collecting section 10 has a light collecting prism 12 which is arranged within a frame 11 with an inclination at a prescribed angle with a horizontal direction, a reflection louver 40 which is arranged right under the light collecting prism, a rotational drive assembly 14 which rotationally drives the light collecting prism 12 and the reflection louver 40 around the perpendicular axis and a controller 18 which controls this rotational drive assembly 14. The reflection louver 40 comprises 8 sheets of plane mirrors 41 of both side reflection. The reflection louver reflects the light emitted from the light collecting prism 12 and introduces the light to the inner side of the room.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sunlight collecting device for rotating a lighting prism in accordance with the position of sunlight to take sunlight into a room.

[0002]

2. Description of the Related Art At present, a daylighting daylighting apparatus which has been put into practical use has a rotatable one daylighting prism or a two-way rotatable independently provided at a predetermined interval.
A plurality of daylighting prisms, a rotation drive mechanism for rotating these prisms, and a rotation angle of the prism are determined based on the incident direction of sunlight, and the rotation drive mechanism is controlled so that the sunlight is effectively guided into the room. A control device.

The daylighting prism is a macroscopically flat plate-like prism having a flat upper surface facing the sun and a large number of minute prism structures formed on the lower surface. A conventional solar lighting device is configured by arranging one or two such macroscopically flat lighting prisms in parallel with the horizontal direction. These daylighting prisms are driven to rotate while maintaining a state parallel to the horizontal direction.

[0004]

However, in the conventional solar lighting device, the plane of the lighting prism facing the sun is parallel to the horizontal direction. There is a problem that the incident angle of sunlight increases and the reflectivity increases, so that sunlight cannot be efficiently guided indoors.

[0005] Further, if the lighting prism is constituted by one sheet for cost reduction, the direction of the light emitted from the lighting prism cannot be completely controlled. Therefore, especially when the altitude of the sun is low, the lighting prism is required. Most of the light emitted from the light source is reflected by the inner surface of the light guide duct connecting the daylighting device to the room and reaches the room. However, when the light guide duct is long, there is a problem that the number of reflections increases, and the amount of sunlight guided indoors decreases due to reflection loss.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and provides a sunlight collecting device capable of efficiently guiding sunlight into a room even when the altitude of the sun is low. With the goal.

[0007]

According to a first aspect of the present invention, there is provided a sunlight collecting device, comprising: a single lighting prism which is arranged at a predetermined angle to a horizontal direction so as to face the sun; A reflecting louver configured of a plurality of mirrors disposed immediately below the lighting prism and reflecting light emitted from the lighting prism, a supporting member for supporting the lighting prism and the reflecting louver, and rotating the supporting member about a vertical axis And a control device for controlling the rotary driving device so that the lighting prism has an appropriate rotation angle according to the position of the sun. According to the above configuration, the sunlight enters the daylighting prism and is refracted,
The light is further reflected downward by the mirror of the reflection louver and guided to the indoor side. The control device controls the rotation driving device so that the lighting prism faces the sun, and rotates the lighting prism and the reflection louver integrally.

[0008] A solar lighting device according to a second aspect of the present invention includes a single lighting prism arranged to face the sun and a plurality of mirrors arranged immediately below the lighting prism. A reflecting louver for reflecting light emitted from the lighting prism, a supporting member for supporting the lighting prism and the reflecting louver, a rotary driving device for rotating the supporting member about a vertical axis, and an incident side and an emitting side of the lighting prism. A support member rotating device that rotates the support member about a rotation axis that is substantially perpendicular to the main cross section that is both perpendicular to the surface and adjusts the inclination angle of the lighting prism and the reflection louver;
It is characterized by including a control device for controlling the rotation drive device and the support member rotation device so that the lighting prism has an appropriate rotation angle and inclination angle according to the position of the sun. According to the above configuration, the sunlight enters the daylighting prism, is refracted, is reflected by the mirror of the reflection louver, and is guided more efficiently to the indoor side. In this case, the control device controls the rotation driving device and the support member rotating device so that the lighting prism faces the sun, thereby rotating the lighting prism and the reflection louver integrally, and the inclination angle of the holding member that holds these. To adjust.

When each mirror constituting the reflection louver is a plane mirror, each plane mirror is perpendicular to both the incident side and the exit side of the daylighting prism. It is desirable to arrange so as to be substantially perpendicular to the main cross section. Further, as described in claim 4 of the present invention, the reflection louver is rotatable so as to change the reflection direction while maintaining a state substantially perpendicular to the main cross section,
A louver rotating device for rotating the reflection louver may be provided. According to this configuration, adjustment of the emission direction by rotation of the lighting prism and adjustment of the reflection direction by rotation of the reflection louver can be performed independently. Further, as described in claim 5 of the present invention, the reflection louver may be configured by concentrically arranging a plurality of truncated conical cylindrical mirrors having different diameters. Instead of the reflection louver, a correction prism having a refraction function similar to the reflection function of the reflection louver may be provided.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a solar lighting device according to an embodiment of the present invention. Figure 1 shows the first
FIG. 2 is an enlarged sectional view of a lighting prism and a plane mirror shown in FIG. 1, and FIG. 3 is a plan view of a lighting part. First Embodiment: A solar lighting device according to a first embodiment includes a lighting unit 10 that captures sunlight, and a light guide duct 20 that guides sunlight incident on the lighting unit 10 to a room. Is attached to an opening 31 formed in the upper wall 30 of the first embodiment. The upper surface of the upper wall 30 is the roof 30a, and the lower surface is the ceiling 3 of the room.
0b. Note that the upper surface of the daylighting unit 10 is covered with a dome-shaped transparent cover 19. The lighting unit 10 includes the opening 3
1, a frame body 11 attached from the roof 30a side, a single daylighting prism 12 arranged in the frame body 11, a reflection louver 40 disposed immediately below the daylighting prism, a daylighting prism 12 and a reflection louver 40. A rotation driving device 14 that rotates around an axis, and a rotation driving device 14 so that the lighting prism 12 has an appropriate rotation angle according to the position of the sun.
Is provided. The frame 11 has a peripheral wall 11a inserted into the opening 31 and a flange 11b formed outward at the upper end thereof, and has a bottom surface through which light transmitted through the lighting prism 12 is transmitted through the light guide duct 20. There is formed an optical path hole 11c that allows the light to pass therethrough.

The daylighting prism 12 has a flat surface facing the sun and, as shown in FIG. 2, is a macroscopically flat plate-like prism having a large number of fine prism structures 12a formed on the back surface. It is arranged at a predetermined angle to the direction. The daylighting prism 12 has a function of refracting incident light by a small prism structure 12a to the side having a low inclination, that is, to the left side in the rotational position of FIG. 1, and by adjusting the rotational position, the incident light is adjusted. The direction of the emitted sunlight can be changed. The reflection louver 40 is composed of eight double-sided reflecting plane mirrors 41 in this example, and has a function of reflecting the light refracted by the daylighting prism 12 and guiding it to the indoor side. Each plane mirror 41 is, for example, as shown by a broken line in FIG.
The circular lighting prisms 12 are arranged so as to form a chord parallel to one tangential direction. This tangential direction is parallel to the ridge line of the prism structure 12a of the daylighting prism 12.
Here, assuming that a main section perpendicular to both the entrance side and the exit side of the daylighting prism 12 is defined as a plane parallel to the paper surface of FIG. 2, each plane mirror 41 of the reflection louver 40 is perpendicular to the main section, respectively. It is arranged as follows. That is, the light beam incident on the lighting prism 12 in the main section is
After being refracted by the plane mirror 41 and reflected by the plane mirror 41, it is included in the main cross section.

Lighting prism 12 and reflection louver 40
Are integrally connected via a support member 13a to a rotating ring 13 which is a disk arranged in parallel with the horizontal direction. The support member 13a is a cylindrical member obtained by diagonally cutting the upper side of a cylinder. The light-receiving prism 12 is coupled to the upper end of the support member 13a, and the plane mirror 41 of the reflection louver 40 is installed inside the support member 13a. As shown in FIG. 3, the rotating ring 13 is rotatably supported by rotating supports 16a to 16d provided at four locations around the rotating ring every 90 degrees. These rotary supports 16 a to 16 d are fixed to the frame 11. With such a configuration, the lighting prism 12 and the reflection louver 40 rotate around the vertical axis in an integrated state while maintaining a fixed positional relationship. In this example, each plane mirror 41 of the reflection louver 40 is used.
Is fixed to the support member 13a, and the lighting prism 1
The tilt angle with respect to 2 is constant.

The rotary drive device 14 includes a motor that is driven to rotate by a command from the control device 18, a speed reduction gear train that reduces the speed of rotation of the motor for transmission, and a drive gear that meshes with the gear train. It meshes with a driven gear formed on the outer circumference of the rotating ring 13. The control device 18
It is mainly composed of a microcomputer, and the control data of the lighting prism accompanying the operation of the sun is stored in advance,
The motor of the rotation driving device 14 is controlled so that the rotation angle of the lighting prism 12 becomes an optimum angle in accordance with the altitude and azimuth of the sun. The light guide duct 20 includes a cylindrical peripheral wall 21 and a flange 22 formed outward from a lower end of the peripheral wall 21.
And is inserted into the opening 31 of the upper wall 30 from the side of the ceiling 30b, and is coupled to and fixed to the daylighting unit 10. The inner surface of the peripheral wall 21 of the light guide duct 20 is configured as a reflecting surface 21a so as to reflect light that enters from the lighting part 10 side and strikes the inner surface. At the boundary between the light guide duct 20 and the indoor side, that is, at the lower end of the peripheral wall 21 of the light guide duct 20, a diffusion plate 23 for diffusing light guided into the room through the light guide duct 20 is fitted and fixed. I have.

When the solar lighting device is in operation, the control device 1
Reference numeral 8 controls the motor of the rotary drive unit 14 so that the low-inclination side of the lighting prism 12 faces the incident direction of sunlight.
For this reason, sunlight incident on the daylighting prism 12 is incident substantially parallel to the main cross section. The incident sunlight is refracted by the daylighting prism 12 and then reflected by the plane mirrors 41 of the reflection louver 40 and guided to the light guide duct 20, directly or by the reflection surface 2 of the peripheral wall 21.
The light is reflected by 1 a and enters the diffusion plate 23. As described above, since the plane mirror 41 is set substantially perpendicular to the main cross section, the refracting action of the daylighting prism and the reflecting action of the reflection louver complement each other when the altitude of the sun is low in the same main cross section. Like each other, they act to cancel each other when the altitude of the sun is high. As a result, regardless of the altitude of the sun, the sunlight can be efficiently guided into the room. The sunlight incident on the diffusion plate 23 is diffused and illuminates the room on average. Since the reflection louver 40 having a high reflectance is disposed immediately below the lighting prism 12, most of the light enters the diffusion plate 23 with a small number of reflections on the peripheral wall 21 having a low reflectance. The light use efficiency can be made higher than when the louver 40 is not provided.

FIGS. 4A to 4C are explanatory diagrams showing the relationship between the altitude of the sun and the direction of the lighting prism 12. Same figure
(A) shows when the sun altitude is low in the morning, FIG. (B) shows when the sun altitude is high in the daytime, and FIG. (C) shows when the sun altitude is low in the evening. As shown in FIG. 2B, when the altitude of the sun is high, the sun can be taken in regardless of the direction of the lighting prism 12. On the other hand, when the altitude of the sun is low, as shown in FIGS. 9A and 9C, the daylight prism 12 is controlled by directing the low inclination side of the daylighting prism 12 to the incident direction of sunlight. Can be made smaller than when the lighting prism is horizontal. Since the reflectance on the prism surface increases as the incident angle increases, the sunlight can be more effectively captured by reducing the incident angle. In addition, the refracting action of the lighting prism 12 and the reflecting action of the reflection louver 40 cause the light guide duct 20
As compared with the case where there is no prism and no reflection louver, the incident angle to the light can be made closer to vertical, so that the light that reaches the diffusion plate 23 directly can be increased, and the room can be brightened. In the above example, only an example in which the lighting prism 12 and the reflection louver 40 are used in combination has been described. However, instead of the reflection louver 40, a correction prism having the same refraction function as the reflection function of the reflection louver 40 is used. It may be arranged. As a correction prism,
A macroscopic flat plate-like prism similar to the lighting prism 12 can be used.

Second Embodiment Next, a second embodiment will be described with reference to FIGS. 5 (A) and 5 (B). FIG. 5 (A)
FIG. 6B is a vertical sectional front view showing only a light-taking prism 12, a reflection louver 40A, and a support member 13a that supports these, which are the central part of the solar light-collecting device according to the second embodiment. ) Is a longitudinal sectional side view along the line BB. This embodiment is different from the first embodiment in that the inclination angle of each of the plane mirrors 41 constituting the reflection louver 40A with respect to the support member 13a can be changed. This is the same as the embodiment. That is, each flat mirror 41 has a rectangular shape with a chamfered corner as shown in FIG. 5B when viewed from the front, and a rotating shaft 42 is fixed to the center of both ends in the longitudinal direction. . The rotation shaft 42 is rotatably fitted in a shaft hole formed in the support member 13a, and the plane mirror 41 can rotate around the rotation axis to change the inclination angle.
Each of the plane mirrors 41 is connected by a single link bar 43 as shown in FIG. 5A. When one plane mirror 41 is tilted, the other plane mirrors 4
1 is also inclined at the same angle.

As shown in FIG. 5B, a cutout is formed in the upper central portion of the flat mirror 41, and an interlocking shaft 44 is installed in the cutout portion in parallel with the rotation shaft 42. . Each flat mirror 41 is connected to the link bar 43 by fitting the interlocking shaft 44 into a shaft hole formed in the link bar 43. One plane mirror 41 has
A mirror drive mechanism 45 using a stepping motor is connected to one rotation shaft 42. This mirror driving mechanism 4
When the inclination angle of one plane mirror 41 is changed by 5, the inclination angles of the other plane mirrors 41 are also changed in conjunction. The mirror driving mechanism 45 is controlled by the control device 18 described in the first embodiment, and the inclination angle of the flat mirror 41 is controlled by an external operation signal or in the same manner as the setting of the rotation angle of the lighting prism 12. It is set automatically based on the altitude and direction. According to the second embodiment, since the reflection angle of the reflection louver 40A can be set arbitrarily, regardless of the incident angle of sunlight.
The sunlight can be guided more efficiently into the room than in the first embodiment.

Third Embodiment Next, a third embodiment of the present invention will be described with reference to FIGS. 6 (A) and 6 (B). FIG. 6A shows a lighting prism 12 and a reflection louver 4 which are central portions of the sunlight lighting device according to the third embodiment.
FIG. 1B is a longitudinal sectional front view showing only the support member 13a that supports these components, and FIG. 2B is a plan view of the entire apparatus. The difference between the present embodiment and the first embodiment is as follows.
Each mirror constituting the reflection louver 40B is not a plane mirror but a cylindrical or frustoconical cylinder. Other configurations are the same as those of the first embodiment. In other words, the reflection louver 40B is arranged such that the cylindrical first mirror 46 having the smallest diameter, the second mirror 47 having a large truncated conical cylinder arranged concentrically outside thereof, and further outside thereof. And a third mirror 48 having the largest diameter and a truncated conical cylindrical shape. Second and third mirrors 4
Reference numerals 7 and 48 have a truncated cone shape in which the diameter on the daylighting prism 12 side is small and the diameter gradually increases toward the lower side.
These mirrors are fixed to the support member 13a,
It rotates around the vertical axis integrally with the lighting prism 12 while maintaining the same posture. According to the third embodiment, since the mirrors of the reflection louver 40B are arranged concentrically and have different inclination angles, the light emitted from the lighting prism 12 is reflected by the reflection louver 40B. Diffused in multiple directions. Therefore, the function of the diffusion plate 23 on the indoor side used in the first embodiment is changed to the reflection louver 40.
B, and the diffusion plate 23 can be eliminated.

Fourth Embodiment: Finally, a fourth embodiment of the present invention will be described with reference to FIGS. 7A to 7C. FIG. 7 (A) is an extraction of only a lighting prism 12A, a reflection louver 40C, and a support member 13b and a rotating ring 13 that support these, which are the central part of the sunlight lighting device according to the fourth embodiment. (B)
Is a longitudinal side view taken along the line BB, and FIG. 4C is a longitudinal front view when the lighting prism is inclined. The difference between the fourth embodiment and each embodiment is that the daylighting prism 12A
The support member 13b that supports the reflection louver 40C is rotatable about a rotation axis perpendicular to the main cross section (a plane parallel to the paper surface of FIG. 7A), and adjusts the inclination angle of the lighting prism 12A. It is possible. Other configurations are the same as those of the first embodiment. That is, in this example, as shown in FIG. 7A, the daylighting prism 12 is placed on the upper end of the cylindrical support member 13b.
A is attached, and eight plane mirrors 41 constituting the reflection louver 40C are fixed inside the support member 13b. The plane mirror 41 is disposed so as to be perpendicular to the main section and also substantially perpendicular to the upper surface of the lighting prism 12A.

As shown in FIG. 7B, a rotation shaft 50 is attached to both ends on the outside of the support member 13b in a direction perpendicular to the main section, and the rotation shaft 50 is attached to the outer periphery of the support member 13b. Is fitted in a shaft hole formed in the rotating frame 13c provided in the first frame. Thereby, the support member 13b is rotated by the rotating frame 13c.
Is rotatable about a rotation shaft 50 with respect to the rotation axis. Revolving frame 1
3c is fixed to the rotating ring 13 and is driven by the rotation driving device 14 shown in the first embodiment to rotate about a vertical axis. Also, on the outer wall of the rotating frame 13c, FIG.
As shown by a solid line in (B) and a broken line in FIGS. 7A and 7C, a support member rotating device 51 using a stepping motor is attached. This support member rotation device 51 is connected to one rotation shaft 50, and rotates the support member 13b around the rotation shaft 50 with respect to the rotation frame 13c, for example, as shown in FIG. 7C. This integrally adjusts the inclination angle between the lighting prism 12 attached to the support member 13b and the reflection louver 40C. As described above, the supporting member rotating device 51 is controlled by the control device 18 described in the first embodiment, similarly to the rotation driving device 14, and the control device 18
Controls both devices so that the lighting prism 12 has an appropriate rotation angle and inclination angle according to the position of the sun.

In the fourth embodiment, when the altitude of the sun is low, the rotating frame 13c is rotated so that the lighting prism 12 faces the sun, and the inclination angle (the inclination angle based on the horizontal state) is increased. The support member 13b is tilted. When the solar altitude is high, the inclination angle is reduced to make the vehicle almost horizontal. Thus, regardless of the altitude of the sun, the incident angle of the sunlight can be reduced, the reflectance on the surface of the lighting prism 12 can be reduced, and the light amount can be used effectively. In the fourth embodiment, the flat mirror 41 is fixed to the support member 13b,
Although only the case where the tilt angle of the 2A and the flat mirror 41 is controlled integrally has been described, by providing the mechanism described in the second embodiment, the tilt angle of the flat mirror 41 can be set to the tilt angle of the support member 13b. May be adjusted independently so that the tilt angle can be adjusted independently of the lighting prism 12A.

[0022]

The solar lighting device of the present invention has the following excellent effects because it is configured as described above. (1) According to the configuration of claim 1, since the lighting prism facing the sun is arranged to be inclined at a predetermined angle with respect to the horizontal direction, by rotating the lighting prism in a direction in which the incident angle with respect to the lighting prism becomes smaller, In particular, even when the altitude of the sun is low, the sunlight can be efficiently guided indoors. In addition, since the reflection louver with high reflectance is located directly below the lighting prism, most of the light is guided indoors without being reflected by the peripheral wall of the light guide duct with low reflection, and a reflection louver is provided. The light use efficiency can be increased as compared with the case where no light is used.

(2) According to the second aspect of the present invention, the tilt angle of the lighting prism can be changed according to the altitude of the sun by making the supporting member for supporting the lighting prism and the reflection louver rotatable. This makes it possible to reduce the incident angle of sunlight regardless of the altitude of the sun, reduce the reflectance on the surface of the lighting prism, and effectively use the amount of light.

(3) According to the third aspect of the present invention, by arranging the plurality of plane mirrors constituting the reflection louver so as to be substantially perpendicular to the main cross section of the daylighting prism, the refracting action and the reflection of the daylighting prism are achieved. The reflection effect of the louver can be made to complement each other when the altitude of the sun is low and to cancel each other when the altitude of the sun is high in the same main section. As a result, regardless of the altitude of the sun, the sunlight can be efficiently guided into the room.

(4) According to the configuration of the fourth aspect, the inclination angle of each plane mirror constituting the reflection louver can be changed with respect to the support member, so that the reflection angle by the reflection louver can be set arbitrarily. Therefore, regardless of the incident angle of the sunlight, the sunlight can be more efficiently guided into the room.

(5) According to the configuration of claim 5, each mirror constituting the reflection louver is formed in a truncated cone shape and a plurality of mirrors having different diameters are arranged concentrically so that the light emitted from the lighting prism can be reduced. The light can be diffused in multiple directions by being reflected by a reflection louver. Therefore, the function of the diffuser on the indoor side can be given to the reflection louver,
It is also possible to abolish the diffuser.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view of a solar lighting device according to a first embodiment of the present invention in an attached state.

FIG. 2 is an enlarged sectional view of a daylighting prism applied to the sunlight daylighting device of FIG.

FIG. 3 is a plan view of a daylighting unit of the sunlight daylighting device of FIG.

FIG. 4 is an explanatory diagram of an operation of the sunlight collecting device of FIG. 1,
(A) shows when the sun height is low in the morning, (B) shows when the sun height is high in the daytime, and (C) shows when the sun height is low in the evening.

5A and 5B show a main part of a solar lighting device according to a second embodiment of the present invention, wherein FIG. 5A is a vertical sectional front view, and FIG. It is a side view.

FIGS. 6A and 6B show a main part of a solar lighting device according to a third embodiment of the present invention, wherein FIG. 6A is a longitudinal sectional front view, and FIG.

7A and 7B show a main part of a solar lighting device according to a fourth embodiment of the present invention, wherein FIG. 7A is a longitudinal sectional front view, and FIG.
FIG. 4C is a vertical sectional side view taken along the line B, and FIG. 4C is a vertical sectional front view when the lighting prism is inclined.

[Explanation of symbols]

 10: Daylighting part 12: Daylighting prism 13: Support member 14: Rotary drive device 18: Control device 20: Light guide duct 21a: Reflection surface 23: Diffusion plate 40: Reflection louver 41: Flat mirror

Claims (5)

[Claims] 1. A lighting prism comprising: a lighting prism arranged at a predetermined angle to a horizontal direction so as to face the sun; and a plurality of mirrors arranged immediately below the lighting prism. A reflection louver that reflects light emitted from the light source, a support member that supports the lighting prism and the reflection louver, a rotation driving device that rotates the support member about a vertical axis, and the lighting prism according to the position of the sun. A control device for controlling the rotation drive device so as to obtain a proper rotation angle. 2. A reflecting louver, comprising: a single lighting prism arranged so as to face the sun; and a plurality of mirrors arranged immediately below the lighting prism, and reflecting light emitted from the lighting prism. A support member that supports the lighting prism and the reflection louver; a rotation driving device that rotates the support member about a vertical axis; and a main section perpendicular to both the incident side and the exit side surface of the lighting prism. A support member rotating device for rotating the support member about a substantially vertical rotation axis to adjust the inclination angle of the lighting prism and the reflection louver; and an appropriate rotation of the lighting prism according to the position of the sun. Horn,
A sunlight collecting device comprising: a control device that controls the rotation drive device and the support member rotation device so as to have an inclination angle. 3. A mirror constituting each of the reflection louvers is a plane mirror, and each plane mirror is disposed so as to be substantially perpendicular to a main section perpendicular to both the entrance side and the exit side of the daylighting prism. The solar lighting device according to claim 1, wherein 4. The reflection louver is rotatable so as to change the reflection direction while maintaining a state substantially perpendicular to the main cross section, and a louver rotation device for rotating the reflection louver is provided. The sunlight collecting device according to claim 3, wherein: 5. The sunlight according to claim 1, wherein the reflection louver is configured by concentrically arranging a plurality of truncated conical mirrors having different diameters. Lighting device.