JP2016066551A - Light collection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light collection device high in degree of freedom of fitting timing or fitting position, and capable of sufficiently collecting sunlight to a room depth of a room, even in a case where sun elevation is high.SOLUTION: A louver 1 reflects sunlight to irradiate an indoor ceiling surface 15. The louver 1 includes a plurality of vanes 20 aligned in vertical direction to outside, and on the upper surface of the vane 20, a reflection surface 30 reflecting sunlight is provided. The reflection surface 30 is divided into a plurality of reflection regions 30A-30F for each sun elevation from an indoor side toward an outdoor side. The reflection regions 30A- 30F cope with lower sun elevation as arranged toward the indoor side from the outdoor side.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a daylighting apparatus that reflects sunlight and irradiates an indoor ceiling surface.

Conventionally, a light shelf or a blind is known as a daylighting device for introducing sunlight into a room.
For example, the light shelf projects horizontally from the outer wall, reflects sunlight with a substantially horizontal reflecting surface, introduces it into the room through a lighting window, and irradiates the indoor ceiling surface (see Patent Document 1).
Moreover, as a blind, there exists a gradation blind which can adjust the angle of a slat according to solar altitude, for example (refer patent document 2). This blind is installed indoors and changes the inclination angle of the slat sequentially from the upper slat to the lower slat.

JP 2010-186695 A JP-A-10-317850

  However, the light shelf disclosed in Patent Document 1 has a flat reflecting surface. Therefore, when the solar altitude changes during the day, the irradiation area also changes in accordance with the change in the solar altitude. Therefore, if the solar altitude is high, effective lighting may not be obtained. For example, when the solar altitude is low, sufficient lighting can be obtained on the ceiling surface behind the room, but when the solar altitude is high, only the ceiling surface near the window becomes bright.

  Moreover, in the light shelf shown in Patent Document 1, it is necessary to enlarge the planar shape to some extent in order to secure the reflecting surface. Therefore, the influence that the light shelf has on the exterior of the building is increased, and it is necessary to consider the mounting position even when the light shelf is adopted at the planning stage or is installed in an existing building. As a result, there has been a problem that the mounting timing and mounting position of the light shelf are greatly limited.

  In addition, since the blind shown in Patent Document 2 is installed indoors, when the solar altitude is high, the amount of sunlight reflected on the surface of the window glass increases, or a part of the daylighting device has a window frame. The amount of light reaching the room decreases due to the shade.

  An object of the present invention is to provide a daylighting apparatus that can sufficiently incorporate sunlight into the interior of a room even when the degree of freedom of attachment time and position is high and the solar altitude is high. To do.

  The daylighting device according to claim 1 is a daylighting device that reflects sunlight and irradiates an indoor ceiling surface (for example, a ceiling surface 15 described later), and a plurality of the daylighting devices are arranged side by side in the vertical direction outdoors. A wing plate (for example, a wing plate 20 described later) is provided, and a reflection surface (for example, a reflection surface 30 described later) for reflecting sunlight is provided on the upper surface of the wing plate. It is divided into a plurality of reflective areas (for example, reflective areas 30A to 30F described later) for each solar altitude toward the indoor side, and the plurality of reflective areas correspond to lower solar altitudes as they are arranged indoors. It is characterized by doing.

  The daylighting device according to claim 2 is characterized in that a cross-sectional shape of the reflection region is substantially linear.

  The daylighting device according to claim 3, wherein the plurality of reflection regions correspond to solar altitudes of 70 °, 60 °, 50 °, 40 °, 30 °, and 20 ° in order from the outdoor side to the indoor side. It is characterized by.

  According to the present invention, since the daylighting apparatus is configured by arranging a plurality of slats vertically, the area in plan view is smaller than that of a conventional light shelf. Further, the shape of the daylighting device can be freely adjusted according to the conditions of the building by enlarging and reducing the shape of the slats at an equal ratio or by appropriately adjusting the number of stages of the slats. Therefore, the daylighting device can be easily attached to an existing building, and the influence of the daylighting device on the exterior of the building can be reduced, so that the degree of freedom of the daylighting device mounting position and the mounting position is increased.

  Moreover, the reflective surface was divided into a plurality of reflective areas for each solar altitude, and these reflective areas were arranged on the indoor side to correspond to lower solar altitudes. Therefore, when the solar altitude is high, sunlight is reflected by the reflection area on the outdoor side, and when the solar altitude is low, the sunlight is reflected by the reflection area on the indoor side and is taken indoors. Therefore, it is possible to reliably irradiate the back of the room with sunlight over a wide range of time during the day, regardless of seasonal changes.

  Moreover, since the reflecting surface is composed of a plurality of reflecting regions corresponding to each solar altitude, it is not necessary to change the posture of the slats, and a movable mechanism is not necessary. Therefore, since the maintenance work only needs to be a cleaning work for maintaining the reflectance of the reflecting surface of the slats, the maintenance cost can be reduced.

  Moreover, since the daylighting device is installed outside the windowpane of the daylighting window, sunlight is reflected outside the windowpane, so the light incident on the windowpane is nearly perpendicular to the glass surface, It can suppress that the light quantity introduce | transduced indoors by reflection of falls.

It is sectional drawing of the building in which the lighting apparatus which concerns on one Embodiment of this invention was provided. It is sectional drawing of the wing board of the lighting apparatus which concerns on the said embodiment. It is a schematic diagram which shows the cross-sectional shape of the reflective surface of the lighting apparatus which concerns on the said embodiment. It is FIG. (1) for demonstrating the procedure which determines the cross-sectional shape of the reflective surface which concerns on the said embodiment. It is FIG. (2) for demonstrating the procedure which determines the cross-sectional shape of the reflective surface which concerns on the said embodiment. It is sectional drawing of the building in which the lighting device which concerns on the modification of this invention was provided.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of a building 10 provided with a louver 1 as a lighting device according to an embodiment of the present invention. 1 and 2 are cross-sectional views in a direction perpendicular to the daylighting window 12.

The louver 1 is provided outdoors along the daylighting window 12 of the building 10, reflects the sunlight S, and irradiates the indoor ceiling surface 15 with the reflected light R.
A room 13 is provided inside the building 10. The chamber 13 is a space surrounded by the daylighting window 12, the floor surface 14, and the ceiling surface 15.

  The daylighting window 12 is located inside the outer wall surface 11 of the building 10 and extends from the vicinity of the floor surface 14 to the ceiling surface 15. The louver 1 is outside the daylighting window 12 in a plan view, and has an edge on the outdoor side that is flush with the outer wall surface 11, and is located above the daylighting window 12 in an elevational view.

The louver 1 includes a plurality of slats 20 arranged side by side in the vertical direction. The louver 1 does not have a movable mechanism, and the slats 20 are fixed in a predetermined posture.
Each slat 20 extends substantially horizontally along the daylighting window 12.
Here, the slat 20 is made of aluminum, and preferably an aluminum bright alloy. In order to ensure weather resistance, the slats 20 are anodized on the surface and are further subjected to clear coating. In addition, when manufacturing the slat 20, if the aluminum extrusion material is subjected to electrolytic polishing, chemical polishing, cloth polishing, etc., and then subjected to alumite processing on the surface of the slat 20, the regular reflectance increases. preferable.

FIG. 2 is a sectional view of the slat 20 constituting the louver 1.
A portion on the outdoor side of the upper surface of the slat 20 is a reflecting surface 30 that is inclined downward toward the indoor side. The reflecting surface 30 reflects the sunlight S incident through the daylighting window 12, introduces the reflected light R into the chamber 13, and irradiates a predetermined irradiation area of the ceiling surface 15.
Moreover, the part other than the reflective surface 30 among the upper surfaces of the slats 20 is substantially horizontal. Thereby, rain water is hard to collect on the upper surface of the slat 20 and draining is easy.

  Further, a portion of the slat 20 that curves from the side surface on the outdoor side to the bottom surface is a second reflecting surface 40. When the solar altitude is low, the second reflecting surface 40 reflects sunlight incident through the daylighting window 12 and introduces reflected light into the chamber 13.

FIG. 3 is a schematic diagram showing a cross-sectional shape of the reflecting surface 30.
The reflective surface 30 is divided into six reflective regions 30A, 30B, 30C, 30D, 30E, and 30F from the outdoor side toward the indoor side for each of these six solar altitudes.
The reflection regions 30A to 30F correspond to solar altitudes of 70 °, 60 °, 50 °, 40 °, 30 °, and 20 °, respectively. Each of the reflection regions 30A to 30F is linear in cross-sectional view, and the angles of the reflection regions 30A to 30F with respect to the horizontal plane are θ _A , θ _B , θ _C , θ _D , θ _E , and θ _F.

Next, a procedure for determining the angle θ _A with respect to the horizontal plane of the reflective region 30A will be described.
First, the angle relative to the horizontal plane of the reflected light R of the reflection area 30A and theta _R, obtaining the angle theta _R. As shown in FIG. 4, when the height from the ceiling surface 15 of the reflection area 30A is t and the horizontal distance from the slat 20 to the irradiation area is d, the following expression (1) is established.

The angle θ _R of the reflected light R is obtained by the following equation (2) by modifying the equation (1).

The angle θ _R of the reflected light R is set in the range of 0 ° to 40 °, for example.
Next, the angle θ _A of the reflection region 30A is obtained. As shown in FIG. 5, the solar altitude, that is, the angle of sunlight S with respect to the horizontal plane is defined as θ _S (70 °). Then, since the incident angle and the reflection angle are equal to the reflection region 30A, the following expression (3) is established.

The angle θ _A of the reflection region 30A is obtained by the following equation (4) by transforming the equation (3) and further substituting the equation (2).

As a result, the reflection region 30A reflects the sunlight S having a solar altitude θ _S (70 °), emits the reflected light R at an angle θ _R , and irradiates a predetermined irradiation region on the ceiling surface 15.

The angles θ _B to θ _F with respect to the horizontal plane of the reflection regions 30B to 30F are determined by the same procedure as that for the reflection region 30A. Thereby, the reflection regions 30B to 30F reflect the sunlight S having a solar altitude of 60 °, 50 °, 40 °, 30 °, and 20 °, and irradiate the predetermined irradiation region on the ceiling surface with the reflected light R.

  Then, a spline curve obtained by combining the straight lines constituting the reflection areas 30A to 30F is obtained to obtain a cross-sectional shape of the reflection surface 30.

According to this embodiment, there are the following effects.
(1) Since the louver 1 is configured by arranging the plurality of slats 20 vertically, the area in plan view is smaller than that of a conventional light shelf. Further, the shape of the louver 1 can be freely adjusted according to the conditions of the building by enlarging or reducing the shape of the slat 20 at an equal ratio or by appropriately adjusting the number of steps of the slat 20. Accordingly, the louver 1 can be easily attached to an existing building, and the influence of the louver 1 on the exterior of the building can be reduced, so that the degree of freedom of the louver 1 attachment timing and the attachment position is increased.

  The reflective surface 30 was divided into a plurality of reflective areas 30A to 30F for each solar altitude, and these reflective areas 30A to 30F were made to correspond to lower solar altitudes as they were arranged indoors. Therefore, when the solar altitude is high, the sunlight is reflected by the reflection areas 30A to 30C on the outdoor side, and when the solar altitude is low, the sunlight is reflected by the reflection areas 30D to 30F on the indoor side. Take it indoors. Therefore, it is possible to reliably irradiate the back of the room with sunlight over a wide range of time during the day, regardless of seasonal changes.

  Since the reflecting surface 30 is composed of the plurality of reflecting regions 30A to 30F corresponding to the solar altitudes, it is not necessary to change the posture of the slats 20, and a movable mechanism is unnecessary. Therefore, since the maintenance work only needs to be a cleaning work for maintaining the reflectance of the reflecting surface 30 of the slat 20, the maintenance cost can be reduced.

  Since the louver 1 is installed outside the window glass of the daylighting window 12, sunlight is reflected outside the window glass, so that the light incident on the window glass is nearly perpendicular to the glass surface. It can suppress that the light quantity introduce | transduced indoors by reflection falls.

It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.
For example, as shown in FIG. 1, a blind 50 that is not a gradation blind may be provided inside the daylighting window 12. In this case, a slat having a high transmittance is used in the upper part 51 of the blind 50, that is, the part through which sunlight reflected by the louver 1 passes.
In addition, as shown in FIG. 6, the louver 1 may be disposed further outside the outer wall surface 11, and the collar 60 may be provided on the louver 1. In this case, the outdoor side edge of the louver 1 may be flush with the front end of the rod 60 in plan view.

θ _A , θ _B , θ _C , θ _D , θ _E , θ _F ... Reflection area angle θ _R ... Reflected light angle θ _S .. Solar altitude (sunlight angle)
R ... Reflected light S ... Sunlight d ... Horizontal distance from the slats to the irradiation area t ... Height of the reflection area from the ceiling surface 1 ... Louver (lighting device)
DESCRIPTION OF SYMBOLS 10 ... Building 11 ... Exterior wall 12 ... Daylighting window 13 ... Room 14 ... Floor surface 15 ... Ceiling surface 20 ... Wing board 30 ... Reflective surface 30A, 30B, 30C, 30D, 30E, 30F ... Reflective area 40 ... 2nd reflective surface 50 ... blind 51 ... upper 60 ... 庇

Claims (3)

A daylighting device that reflects sunlight and irradiates an indoor ceiling surface,
It has a plurality of slats arranged side by side in the vertical direction outdoors,
On the upper surface of the slats, a reflective surface that reflects sunlight is provided,
The reflective surface is divided into a plurality of reflective areas for each solar altitude from the outdoor side toward the indoor side,
The daylighting apparatus characterized in that the plurality of reflection areas correspond to lower solar altitudes as they are arranged indoors.   The daylighting apparatus according to claim 1, wherein a cross-sectional shape of each of the reflection regions is substantially linear.   The plurality of reflective regions correspond to solar altitudes of 70 °, 60 °, 50 °, 40 °, 30 °, and 20 ° in order from the outdoor side to the indoor side. Or the daylighting device of 2.

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