JP2000028956A - Reflection type natural lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reflection type natural lighting device by which the solar light can be efficiently taken in though the incident direction of the solar light is changed and the driving device is not made large-sized. SOLUTION: The south-side wall surface 11 of a building 10 and the like is provided with a normal window 12 for securing a visual field and a light taking-in window 14 positioned near a ceiling 13 more upward than the window 12. Then, the reflection type natural lighting device 20 reflecting the solar light toward the ceiling 13 in a room is arranged at the lower side of the window 14. The lighting device 20 is provided with a plate-like eaves member 21 arranged at the lower side of the window 14 by being made to project, a light taking-in prism 22 which is arranged in parallel with the outdoor part of the eaves member 21 and which functions as the reflection member, the driving device 23 driving the prism 22 to adjust the reflecting direction thereof and a controller 30 controlling the driving device 23 so that the reflecting angle of the prism 22 becomes a proper angle corresponding to the incident direction of the solar light.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reflection type lighting device which is attached to a window on a wall surface of a building and reflects sunlight to a ceiling surface of the room to brighten the room.

[0002]

2. Description of the Related Art Hitherto, a configuration as shown in FIG. 5 has been proposed in order to realize natural daylighting using sunlight.
On the south side wall surface 2 of a building 1 such as a building, a normal window 3 for securing a view for each floor and a lighting window 4 located near the ceiling 5 above the normal window 3 are provided. On the lower side of the daylighting window 4, a reflective daylighting plate 6 that reflects sunlight toward the indoor ceiling 5 is disposed in an eaves-like shape that projects outside the room.

[0003] Direct sunlight is reflected by the reflection type daylighting plate 6 and reaches the ceiling 5 through the daylighting window 4. Ceiling 5
Is formed in a dome shape with a low center in the room, and the sunlight taken in by the reflection-type daylighting plate 6 is reflected by the ceiling 5 to brighten the room.

[0004]

However, since the above-mentioned conventional reflection-type daylighting plate 6 is a mere flat plate-like reflection plate whose upper surface is mirror-finished, when daytime sunlight is incident from the south side, the sunlight is not reflected. Although the light can be effectively reflected toward the indoor ceiling 5, there is a problem that the sunlight cannot be efficiently collected in the morning and evening because the incident direction of the sunlight changes to the east or the west. In order to enhance the daylighting efficiency, it is conceivable to change the angle of the reflective daylighting plate 6 in accordance with the change in the incident direction of sunlight.
Since the daylighting plate generally has a width of one sheet meter, a large-sized driving device is required to drive the daylighting plate, resulting in high cost and a large space for arrangement.

[0005] The present invention has been made in consideration of the above-mentioned problems of the prior art.
It is intended to solve the (problem) and provide a reflective lighting device that can efficiently take sunlight regardless of changes in the direction of incidence of sunlight and that does not require a large drive device. is there.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a reflection type daylighting device according to the present invention comprises an eaves member protruding out of a room at a lower side of a window provided on a wall surface of a building; A plurality of reflection members arranged in parallel on the eaves member, a driving device for driving the reflection members to adjust the reflection direction, and so that the reflection members have an appropriate reflection angle according to the incident direction of sunlight. And a control device for controlling the driving device. According to this configuration, the control device controls the driving device according to the incident direction of the sunlight, so that the angle of the reflection member is adjusted so that the sunlight can be efficiently collected.

The reflecting member preferably has a reflecting surface inclined with respect to the horizontal direction. In this case, the reflecting member is rotated about a rotation axis substantially coincident with the vertical direction, so that the reflecting member is arranged in the incident direction of sunlight. The reflection direction can be adjusted accordingly. Further, as the reflecting member, in addition to a flat mirror, a light-collecting prism having a disc-shaped planar shape in which a reflecting surface and an end surface on the incident side form a predetermined angle can be used. When a daylighting prism is used, it is desirable to coat the reflecting surface with a reflecting film.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a reflection type lighting device according to an embodiment of the present invention. FIG. 1 is a longitudinal sectional side view showing an attached state of a reflection type daylighting device according to the present embodiment, and FIG. 2 is a plan view of a main part of the device.

On the south side wall surface 11 of a building 10 such as a building, there are provided a normal window 12 for securing visibility and a lighting window 14 located near the ceiling 13 above the normal window 12. On the lower side of the daylighting window 14, a reflection type daylighting device 20 that reflects sunlight toward the indoor ceiling 13 is arranged.

The reflection type daylighting device 20 includes a flat eave member 21 protruding outside the room at the lower side of the daylighting window 14.
A lighting prism 22 as a reflecting member arranged in parallel with the outdoor portion of the eaves member 21; and a driving device 23 for driving the lighting prism 22 to adjust the reflection direction.
And a control device 30 that controls the driving device 23 so that the lighting prism 22 has an appropriate reflection angle according to the incident direction of sunlight. The lighting prism 22 and the driving device 23 are covered with a dome-shaped cover 24 made of a transparent resin. Further, the tip of the eaves member 21 and the normal window 1
A support member 21 a for supporting the eaves member 21 is provided between the lower wall 2 and the wall 2.

The daylighting prism 22 has a circular planar shape as shown in FIG. 2, and a plurality of, in this example, five, prisms are provided on the eaves member 21 in this example. The diameter of one lighting prism 22 is about 1 meter. The macroscopic sectional shape of the lighting prism 22 is a flat plate as shown in FIG.
Microscopically, it is a Fresnel-type daylighting prism composed of a large number of minute band-shaped wedge-shaped prism structures Px arranged as shown in FIG. The lower surface serving as the reflection surface S is a surface inclined with respect to the horizontal direction. The sunlight incident on the upper surface is reflected by the reflection surface S
And reflected toward the ceiling 13 in the room. In this example, the surface of the reflective surface S is coated with a reflective film of aluminum, silver, or the like in order to efficiently reflect sunlight even when the incident angle with respect to the reflective surface S does not satisfy the total reflection condition.

As shown in FIGS. 1 and 2, the daylighting prism 22 is rotatably supported on the eaves member 21 by a rotation shaft 25 whose center substantially coincides with the vertical direction. A gear 22a is provided.
The driving device 23 includes a motor 23 a and a worm gear 23 b attached to a rotation shaft of the motor 23 a. The worm gear 23 b meshes with the gear 22 a of the prism 22. With such a configuration, by driving the motor 23a to rotate the lighting prism 22 about the rotation axis 25, an appropriate reflection angle and an appropriate reflection angle according to the incident direction of sunlight accompanying a change in the position of the sun are obtained. Can be adjusted to

Next, the configuration of the control system of the above-mentioned reflection type daylighting device will be described with reference to FIGS. 1 and 2 and the block diagram shown in FIG. The control device 30 is mainly configured by a microcomputer 31 and includes a memory 32 in which control data of a lighting prism associated with the operation of the sun is stored in advance, and a clock circuit 33 that counts the date and time. The five lighting prisms 22 are driven by individually provided motors 23 a, and each motor 23 a is controlled by the control device 30 via the driver 40. As a power source, for example, a solar cell 41 is provided.
The power generated or stored by the controller is supplied to the control device 30 and each driver 40.

The microcomputer 31 has a clock circuit 3
The control data is read out from the memory 32 in accordance with the date and time output from 3, the geographical position where the device is installed, and its orientation, so that the rotation angles of all of the lighting prisms 22 have the same optimal reflection angle. The motor 23a is controlled via the driver 40. By such control, the rotation angle of the lighting prism 22, that is, the direction of the reflection surface S can be adjusted according to the incident direction of the sunlight, and the sunlight can be efficiently reflected toward the ceiling 13 in the room. it can.

In the above example, a motor is provided for each of the lighting prisms, but all the prisms may be driven by a single motor using a transmission mechanism such as a gear train. Further, in the above-described embodiment, only an example in which a lighting prism having a circular planar shape is used as the reflecting member has been described. However, since the reflecting member only needs to have a reflecting surface, a simple mirror can be used. When a mirror is used, if the angle of the mirror is three-dimensionally changed using an actuator, the reflected light can be guided to the room most efficiently according to the incident angle of sunlight. However, similarly to the mechanism using the above-described prism, if the reflection surface is arranged to be inclined at a predetermined angle with respect to the horizontal direction and is rotated around a vertical rotation axis, the driving mechanism can be simplified. Can be

[0016]

The reflection-type daylighting device of the present invention is constructed as described above, and has the following excellent effects. (1) According to the configuration of the first aspect, by adjusting the angle of the reflecting member according to the incident direction of the sunlight, the sunlight can be efficiently collected and reflected toward the indoor ceiling. Therefore, even in the morning and evening when the altitude of the sun is low, the room can be brightened.

(2) According to the second aspect of the present invention, the reflection member is provided with the reflection surface inclined with respect to the horizontal direction, so that the reflection of the sunlight by the rotation about the rotation axis substantially coincident with the vertical direction. The direction can be adjusted, and the driving device can be configured with a simple mechanism.

(3) According to the third aspect of the invention, by using a circular lighting prism as the reflecting member, the mechanism of a commonly used ceiling-mounted transmissive sunlight lighting device can be used as it is. be able to. That is, in a transmission type sunlight collecting device, one or two circular light collecting prisms are rotated to adjust the refraction direction to guide the sunlight into a room. Therefore, if the daylighting prism and the driving mechanism used in this transmission type device are used, new development costs can be reduced.

(4) According to the configuration of claim 4, by coating the reflecting surface of the prism with the reflecting film, even if the light incident on the reflecting surface does not satisfy the condition of total reflection,
The reflectance can be kept high, the loss of light quantity can be prevented, and the efficiency of using sunlight can be increased.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional side view of a building showing an attached state of a reflection type daylighting device according to an embodiment of the present invention.

FIG. 2 is a plan view of a main part of the reflection type daylighting device shown in FIG.

FIG. 3 is an enlarged sectional view of a lighting prism of the reflection-type lighting device shown in FIG.

FIG. 4 is a block diagram showing a control system of the reflection type daylighting device shown in FIG.

FIG. 5 is a longitudinal sectional side view of a main part of a building showing a state of attachment of a conventional reflection type lighting plate.

[Explanation of symbols]

 13: Ceiling 14: Daylighting window 20: Reflective daylighting device 21: Eave member 22: Daylighting prism 22a: Gear 23: Driving device 23a: Motor 23b: Worm gear 24: Domed cover 25: Rotating shaft 30: Control device

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshimoto Fujimoto 2-5-2-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Yasuo Takase 2 Keihanhondori, Moriguchi-shi, Osaka 5-5, Sanyo Electric Co., Ltd.

Claims (4)

[Claims] 1. A reflection type daylighting device provided on a lower side of a window provided on a wall surface of a building and reflecting sunlight toward a ceiling in a room, wherein an eave member protruding outside the room is disposed on a lower side of the window. A plurality of reflecting members arranged in parallel on the eaves member, a driving device for driving the reflecting member to adjust a reflecting direction, and an appropriate reflecting member for reflecting light in accordance with the incident direction of sunlight. A reflection type daylighting device, comprising: a control device for controlling the driving device so as to form an angle. 2. The apparatus according to claim 1, wherein the reflecting member has a reflecting surface inclined with respect to a horizontal direction, and is arranged so as to be rotatable around a rotation axis substantially coincident with a vertical direction. The reflective daylighting device according to the above. 3. The reflection type daylighting according to claim 2, wherein the reflection member is a daylighting prism having a disc shape in a plane shape in which the reflection surface and the end surface on the incident side form a predetermined angle. apparatus. 4. The reflection type daylighting device according to claim 3, wherein a reflection surface of the daylighting prism is coated with a reflection film.