JPH11167084A - Sunshine collecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the sunshine collecting device which can efficiently guide the sunshine into a room even when the altitude of the sun is low and is low- cost. SOLUTION: The device is equipped with a light collection part 10 which takes the sunshine in and a light guide duct 20 which guides the sunshine impinging on the light collection part 10 into a room and fitted to the opening part 31 of the upper wall 30 of a house. The light collection part 10 is equipped with a light collecting prism 12 which is arranged in a frame body 11 obliquely at a specific angle to the horizontal, a rotary driving device 14 which drives and rotates the light collecting prism 12, and a controller 18 which controls the rotary driving device 14 and the internal surface of the peripheral wall 21 of the light guide duct 20 is constituted as a reflecting surface 21a. Further, a diffusion plate 23 is fixed at the border part between the light guide duct 20 and interior side. In this constitution, the light collecting prism 12 can efficiently collect the sunshine even when the sun position is low since the motor of the rotary driving device 14 is so controlled that the low slanting part always faces the incident sunshine.

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 prism having a flat surface facing the sun and a large number of small prism structures mainly 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 plane.

[0004]

However, in the conventional solar lighting device, the plane of the light-receiving prism facing the sun is parallel to the horizontal plane. There is a problem that the incident angle of light becomes large and the reflectance becomes high, so that sunlight cannot be efficiently guided into a room.

[0005] In addition, when two light-collecting prisms are independently rotatably provided, there is a problem that many components are required and the cost is increased.

The present invention has been made in view of the above-mentioned problems of the prior art, and can efficiently guide sunlight into a room even when the altitude of the sun is low. A lighting device is provided.

[0007]

According to a first aspect of the present invention, there is provided a solar lighting apparatus, wherein one lighting prism is disposed at a predetermined angle from a horizontal plane so as to face the sun, and the lighting prism is rotated. It comprises a driving device for driving and a control device for controlling the driving device such 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, is refracted, and is guided to the indoor side. The daylighting prism is rotated so as to face the sun.

Further, as described in claim 2 of the present invention,
As a lighting prism, a large number of minute prism structures are formed on the lower surface, and the lighting prism is coupled to the disk body arranged in parallel with the horizontal plane via a support member, so that the lighting prism can be moved in the horizontal direction. It can be tilted and supported. In addition, a driven gear is formed on the outer periphery of the disk body, and a driving device is provided with a driving gear that meshes with the driven gear, so that rotational torque can be transmitted to the disk body.

[0010] Further, as described in claim 3 of the present invention,
3. The sunlight collecting device according to claim 1, further comprising a light guide duct that guides sunlight transmitted through the lighting prism to a room. 4.

[0011] With this configuration, the sunlight transmitted through the prism is reflected by the reflecting surface in the light guide duct, so that the light can be efficiently guided into the room regardless of a change in the incident direction of the sunlight. .

Further, as described in claim 4 of the present invention, a light guide duct is provided between the lighting prism and the room to guide sunlight transmitted through the lighting prism into the room, and an inner surface of the light guide duct is provided. It is formed as a reflective surface.

In this case, it is desirable to dispose a diffusion plate at the boundary between the light guide duct and the indoor side.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a solar lighting device according to an embodiment of the present invention. FIG. 1 is a longitudinal sectional front view of the solar lighting device according to the present embodiment in an attached state, FIG. 2 is an enlarged sectional view of a lighting prism, and FIG. 3 is a plan view of a lighting unit.

The solar lighting apparatus according to the present embodiment includes a lighting unit 10 for taking in sunlight, and a light guide duct 20 for guiding sunlight incident on the lighting unit 10 into a room.
Is attached to the opening 31 formed in the hole. Upper wall 3
The upper surface of 0 is the roof 30a, and the lower surface is the ceiling 30b of the room. Note that the upper surface of the daylighting unit 10 is covered with a dome-shaped transparent cover 19.

The lighting unit 10 includes a frame 11 attached to the opening 31 from the roof 30a side, a lighting prism 12 disposed in the frame 11, a rotation driving device 14 for driving the lighting prism 12 to rotate, and a lighting prism. A control device 18 is provided for controlling the rotation driving device 14 so that the rotation angle of the rotation driving device 12 becomes an appropriate rotation angle according to the position of the sun.

The frame 11 has a peripheral wall 11a inserted into the opening 31 and a flange 11b formed at the upper end thereof toward the outside. An optical path hole 11c is formed to open toward the light guide duct 20 side.

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 thereof. Are arranged at a predetermined angle with respect to.

The daylighting prism is made of a transparent resin, for example, acryl or polycarbonate.

The daylighting prism 12 uses a small prism structure 12a to transmit light incident from the left (east) side shown in FIG. 1 and FIG.
In addition, at the rotational position of the daylighting prism 12 in FIG. 4A, the light has the effect of being refracted to the left side in the figure.

The daylighting prism 12 has a support member 13a on a rotating ring 13 which is a disk arranged in parallel with a horizontal plane.
And are integrally connected through. The lighting prism 12, the rotating ring 13, and the support member 13a may be integrally formed of a transparent resin. Further, in this example, the support member 13a is a cylindrical member in which the upper side of the cylinder is cut obliquely. However, since it is sufficient to have a function of connecting the lighting prism 12 and the rotating ring 13, a plurality of columnar members are used. It may be provided along the outer periphery of the rotating ring.

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.

The rotary drive unit 14 includes a motor that is driven to rotate by a command from the control unit 18, a 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,
Rotation driving device 1 such that the rotation angle (prism angle) of daylighting prism 12 becomes an optimum angle according to the altitude and azimuth of the sun.
4 is controlled.

The light guide duct 20 comprises a cylindrical peripheral wall 21 and a flange 22 formed outward from the lower end of the peripheral wall 21.
It is inserted from the b side, and is connected and fixed to the lighting unit 10. The inner surface of the peripheral wall 21 of the light guide duct 20 has a reflecting surface 2 so as to reflect light incident from the daylighting unit 10 and hitting the inner surface.
1a. Further, a boundary portion between the light guide duct 20 and the indoor side, that is, the peripheral wall 21 of the light guide duct 20
A diffusion plate 23 for diffusing light guided indoors through the light guide duct 20 is fitted and fixed to the lower end of the light guide duct 20.

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.
The incident sunlight is deflected by the lighting prism 12 and guided to the light guide duct 20, and is incident on the diffusion plate 23 directly or after being reflected by the reflection surface 21 a of the peripheral wall 21. The sunlight taken into the room by the diffusion plate 23 is diffused and illuminates the room on average.

FIGS. 4A to 4C are explanatory diagrams showing the relationship between the altitude of the sun and the direction of the lighting prism 12, respectively.

FIG. 3A shows a case where the altitude of the sun is low in the morning.
The same figure (B) shows when the daytime solar altitude is high, and the same figure (C).
Indicates when the sun is low in the evening.

As shown in FIG. 2B, when the altitude of the sun is high, the sunlight 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. 2A and 2C, the light is collected so that the low inclination side of the light collecting prism 12 is directed to a position facing the incident direction of the sunlight. By controlling the rotation of the position of the prism 12 in accordance with a control command from the control device 18, the angle of incidence on the lighting prism 12 can be made smaller than when the lighting prism is horizontal.

Since the reflectivity on the prism surface increases as the incident angle increases, sunlight can be more effectively taken in by reducing the incident angle.
Further, the angle of incidence on the light guide duct 20 can be made closer to vertical by the deflector effect of the lighting prism 12 as compared with the case where there is no prism, so that the light directly reaching the diffusion plate 23 can be increased. , Can make the room bright.

Further, the inner surface of the light guide duct 20 is
Since it is formed as 1a, all light that strikes the inner surface is also guided to the diffusion plate 23, and the captured light can be efficiently guided to the room.

[0032]

As described above, the solar lighting device of the present invention has the following excellent effects. (1) According to the configuration of the first aspect, since the lighting prism is disposed at a predetermined angle from the horizontal plane so as to face the sun, the lighting prism is rotated in a direction in which the incident angle with respect to the lighting prism becomes smaller, and thus, in particular, Even when the altitude of the sun is low, the sunlight can be efficiently guided into the room.

Further, since only one lighting prism is used, the cost of the apparatus can be kept low, and the transmittance can be increased as compared with an apparatus using two lighting prisms. The amount of light guided into the room can be increased. (2) According to the configuration of the second aspect, the macroscopic flat plate-shaped lighting prism is rotationally driven so as to always face the sun according to the altitude of the sun while being inclined with respect to the horizontal plane. be able to. (3) According to the configuration of the third aspect, by reflecting the sunlight transmitted through the prism by the reflecting surface in the light guide duct, the light is efficiently guided into the room regardless of the change in the incident direction of the sunlight. be able to. (4) According to the configuration of claim 4, the sunlight transmitted through the light guide duct is diffused when guided into the room, and the room can be uniformly illuminated.

[Brief description of the drawings]

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

FIG. 4 is an explanatory diagram of the operation of the solar lighting device of the present embodiment.

[Explanation of symbols]

 10: Daylighting unit 12: Daylighting prism 14: Rotary drive unit 18: Control unit 20: Light guide duct 21a: Reflecting surface 23: Diffusion plate

Claims (4)

[Claims] 1. A light-collecting prism arranged at a predetermined angle from a horizontal plane so as to face the sun, a driving device for rotating and driving the light-collecting prism, and a light-receiving prism suitable for the position of the sun A control device for controlling the driving device so that the rotation angle is large. 2. The lighting prism according to claim 1, wherein a plurality of minute prism structures are formed on a lower surface of the lighting prism, and the prism is coupled via a support member to a disk disposed parallel to a horizontal plane. The sunlight collecting device according to claim 1, further comprising a drive gear that meshes with a driven gear formed on an outer periphery of the disk body to transmit a rotational torque to the disk body. 3. Sunlight transmitted through the daylighting prism,
The sunlight collecting device according to claim 1, further comprising a light guide duct for guiding the light into a room, wherein an inner surface of the light guide duct is formed as a reflection surface. 4. The sunlight collecting device according to claim 3, further comprising a diffusion plate disposed at a boundary between the light guide duct and the indoor side.