JP2005215509A - Sunlight lighting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize efficient sunlight lighting system for always securing full lighting efficiency, without needing complicated control using a simple configuration. <P>SOLUTION: The sunlight lighting system comprises a first reflecting mirror 13 for reflecting sunlight always forward by tracking the sun, in a state with the reflecting face being directed upward, and a second reflecting mirror 14 for reflecting the light reflected from the first reflecting mirror downward, by arranging the reflecting face downward in front of the first reflecting mirror. The upward and downward position of the second reflecting mirror is adjusted by an adjusting mechanism, in response to the fluctuations in the reflecting direction to the second reflecting mirror, accompanying sun tracking of the first reflecting mirror. The second reflecting mirror is a convex mirror, the first reflecting mirror is a concave mirror, and their curvatures are set to be variable. Both the first reflecting mirror and the second reflecting mirror are stored in a common windproof dome. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a sunlight lighting device for collecting sunlight in a building or a courtyard.

  As this type of solar lighting device, a configuration in which a reflecting mirror tracks the sun and reflects the sunlight toward the inside of a building or a courtyard has been proposed. FIG. 8 shows an example of this. A support column 2 is rotatably provided in a transparent windshield dome 1 having an open bottom surface, and a reflecting mirror 3 is provided on the upper portion thereof so as to be rotatable in the vertical direction. In addition, by controlling the depression angle of the reflecting mirror 3, the reflecting mirror 3 is configured to always reflect sunlight directly downward while tracking the sun and to take light through the opening 4.

Patent Document 1 discloses a configuration in which a large number of reflecting plates arranged in parallel are tracked by the sun, and a number of fixed mirrors and movable mirrors are alternately arranged as the reflecting plates.
JP 2001-133676 A

  By the way, since the sunlight lighting apparatus shown in FIG. 8 is a structure which reflects reflected light toward right below, when the solar altitude is low as shown in (a), efficient lighting is possible. However, as shown in (b), when the solar altitude is increased, the light receiving area of the reflecting mirror 3 is reduced and the lighting efficiency is greatly reduced. FIG. 9A shows the result of simulating the daily fluctuation of the light receiving area at the summer solstice for a reflecting mirror with a diameter of 1.2 m. The substantial light receiving area with respect to the entire surface of the reflecting mirror is 40 to 40 in the morning and evening. It can be seen that while it is about 60%, it is only about 10% around noon. In addition, with such a change in the light receiving area, as shown in FIG. 9 (b), the light flux of sunlight that is actually collected also fluctuates greatly, and greatly decreases to about 1/4 in the daytime compared to morning and evening. It will be.

  Moreover, in the apparatus shown by patent document 1, although it is said that it can illuminate effectively even if the solar altitude becomes high by adjusting the space | interval and height of a reflecting plate according to solar altitude. In order to make the adjustments, the configuration becomes extremely complicated, complicated control is required, and the apparatus is inevitably large and the production cost increases. .

  In view of the above circumstances, an object of the present invention is to provide an effective solar lighting device that can always ensure sufficient lighting efficiency without requiring complicated control with a simple configuration.

  According to the first aspect of the present invention, the first reflecting mirror that tracks the sun with the reflecting surface facing upward and always reflects sunlight forward, and the reflecting surface below the first reflecting mirror. And a second reflecting mirror that reflects the reflected light from the first reflecting mirror downward.

  The invention of claim 2 has an adjusting mechanism for adjusting the vertical position of the second reflecting mirror in accordance with the fluctuation of the reflecting direction to the second reflecting mirror accompanying the sun tracking of the first reflecting mirror. is there.

  The invention of claim 3 is a convex mirror as the second reflecting mirror, the invention of claim 4 is a concave mirror as the first reflecting mirror in that case, and the invention of claim 5 is a convex mirror. The curvature of the second reflecting mirror or the first reflecting mirror which is a concave mirror is variable.

  According to the sixth aspect of the present invention, both the first reflecting mirror and the second reflecting mirror are accommodated in a common windshield dome.

  According to the first aspect of the invention, the first reflecting mirror that tracks the sun always receives sunlight in a state of facing upward and reflects forward, and the second reflecting mirror receives and reflects it further downward. Therefore, even if the solar altitude is high, the light receiving area of the first reflecting mirror does not decrease, and efficient lighting is always possible, and the second reflecting mirror is in front of the first reflecting mirror. Therefore, the configuration is not complicated and complicated control is not required.

  According to the second aspect of the present invention, the light receiving area of the second reflecting mirror is also adjusted by finely adjusting the position of the second reflecting mirror in the vertical direction by the adjusting mechanism following the sun tracking of the first reflecting mirror. More efficient daylighting is possible without deteriorating.

  According to the invention of claim 3, by making the second reflecting mirror a convex mirror, the reflected light can be diffused over a wide range and collected. According to the invention of claim 4, by making the first reflecting mirror a concave mirror, the reflected light from the first reflecting mirror to the second reflecting mirror can be narrowed down. Can be small. Furthermore, according to the invention of claim 5, since the curvature of the first reflecting mirror and the second reflecting mirror is variable, the curvature can be optimally set according to the installation position and the purpose of use, and is necessary. It is also possible to change easily according to.

  According to the sixth aspect of the present invention, since the first reflecting mirror and the second reflecting mirror are accommodated in the common windshield dome, the whole can be made compact and installation work can be easily performed.

  FIG. 1 shows a first embodiment of the present invention. This is because a support 12 is rotatably provided in a transparent windshield dome 11, and a first reflecting mirror 13 is provided at an upper portion thereof so that an elevation angle thereof can be adjusted in an upward state. The sun is tracked by an appropriate sun tracking program in a state of facing and the reflected light is always reflected forward. In front of it, the second reflecting mirror 14 is fixed and installed with a support column 15 in a state of facing downward, and this second reflecting mirror 14 directs the reflected light from the first reflecting mirror 13 downward. And reflected through the opening 16 into the building or the courtyard. If it is not necessary to provide the windshield dome 11 in the first reflecting mirror 13, it may be omitted. If necessary, the same applies to the second reflecting mirror 14 as indicated by a broken line in the figure. A windshield dome 11 may be provided.

  As described above, even when the solar altitude is low as shown in FIG. 1 (a), the first reflecting mirror 13 receives sunlight and reflects it forward with the first reflecting mirror 13 always facing upward. As shown in (b), even when the solar altitude is high, the light receiving area of the first reflecting mirror 13 does not vary greatly. FIG. 2 shows a simulation result under the same conditions as those for the case of the conventional solar lighting device shown in FIG. As shown in FIG. 9, in the conventional solar lighting device, the light receiving area is greatly reduced as the solar altitude is increased, so that the luminous flux that can be collected is also greatly reduced. However, as shown in FIG. According to the above, it is possible to secure a light receiving area equal to or greater than that of the conventional one throughout the day, and the light receiving area increases rather at around noon where the solar altitude is the highest. Maximum.

  Therefore, according to this apparatus, as shown in FIG. 8, it is possible to ensure excellent daylighting efficiency throughout the day as compared with the conventional one in which sunlight is directly reflected downward by a single reflecting mirror 3. it can. And this apparatus can divert it as the 1st reflective mirror 13 as it is by using the reflective mirror 3 in the conventional sunlight lighting apparatus as facing upwards, and simply arrange | positions the 2nd reflective mirror 14 ahead of it. Therefore, the configuration is not complicated and does not become large as in the device disclosed in Patent Document 1, and more complicated control is required by simply tracking the first reflecting mirror 13 as in the conventional case. It is not necessary.

  In this apparatus, it is most efficient to set the reflection direction from the first reflecting mirror 13 to the second reflecting mirror 14 to be the horizontal direction and the true south direction. However, as long as it reflects substantially forward. Even if the reflection direction is shifted from the south to the east or west, or from the horizontal direction to the up and down direction, it is much more efficient than the conventional case where the light is reflected directly downward. Is possible.

  FIG. 3 shows a second embodiment of the present invention. In the first embodiment, a plane mirror is used as the second reflecting mirror 14. However, in the second embodiment, a convex mirror is used as the second reflecting mirror 14, thereby diffusing sunlight more widely. It can be daylighted.

  FIG. 4 shows a third embodiment, which employs a concave mirror as the first reflecting mirror 13 and a convex mirror as the second reflecting mirror 14. According to this, the reflected light from the first reflecting mirror 13 to the second reflecting mirror 14 is narrowed down, and the reflected light is again diffused and reflected by the second reflecting mirror 14, so that the second Not only can the reflecting mirror 14 be reduced in size, but also the size of the opening 16 can be reduced.

  Furthermore, in the third embodiment, in addition to the above, the second reflecting mirror 14 is supported via an adjustment mechanism 17 that can change the position in the vertical direction with respect to the support column 15, and the adjustment mechanism 17 is included in the sun tracking program. In synchronism, the position of the second reflecting mirror 14 is finely adjusted in the vertical direction, whereby the second reflecting mirror 14 is adjusted in accordance with the variation in the reflecting direction to the second reflecting mirror 14 due to the sun tracking of the first reflecting mirror 13. The vertical position of the reflecting mirror 14 is optimally set, and the daylighting efficiency throughout the day is further improved.

  FIG. 5 shows a fourth embodiment in which the second reflecting mirror 14 employed in the third embodiment is housed in the common windshield dome 11 together with the first reflecting mirror 13. According to this, the whole apparatus can be integrated in a compact manner, and installation in a building becomes easy.

  In addition, a convex mirror is employed as the second reflecting mirror 14 as in the second to fourth embodiments, and a concave mirror is employed as the first reflecting mirror 13 as in the third to fourth embodiments. Of course, it is possible to employ a convex mirror as the first reflecting mirror 13 and a concave mirror as the second reflecting mirror 14 if necessary. And when adopting such a convex mirror or concave mirror, it is of course possible to manufacture and use those having a desired curvature in advance as the convex mirror or concave mirror, but it is preferable to make the curvature variable, and the configuration for that Examples are shown in FIGS.

  6 employs a thin plate that can be bent as the material of the first reflecting mirror 13 and the second reflecting mirror 14, the front surface thereof is used as a reflecting surface, and the support metal fittings 20 are attached to various places on the back side. These support fittings 20 are fixed with bolts 23 in a state in which their positions can be changed in the front-rear direction with respect to the frame 22 within the range of the long holes 21 as shown in (c) and (d). According to this, not only the first and second reflecting mirrors 13 and 14 are used as plane mirrors, but only by finely adjusting the fixing position of each support fitting 20 with respect to the frame 22 in the front-rear direction, as shown in FIG. Such a convex mirror can be used, or a concave mirror can be used as shown in (b). The curvatures thereof can be set optimally, and the curvature can be easily changed.

  7 shows that the first and second reflecting mirrors 13 and 14 are also bendable, the peripheral portion thereof is fixed to the frame 22, and the central portion thereof is moved in the front-rear direction by an appropriate actuator 24. Displaceable. According to this, by operating the actuator 24, the first and second reflecting mirrors can be changed from a plane mirror to a convex mirror or concave mirror having a desired curvature, and the curvature can be set automatically and accurately and easily. If there is, control that changes the curvature in synchronization with the sun tracking program is also possible.

  Although the embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiments, and the sunlight is reflected forward by the first reflecting mirror and then lowered by the second reflecting mirror. Needless to say, various modifications and applications are possible as long as they are configured to reflect the light.

1 is a schematic diagram showing a first embodiment of a sunlight lighting device of the present invention. It is a figure which shows a simulation result similarly. It is a schematic diagram which shows 2nd Embodiment of this invention. It is a schematic diagram which shows 3rd Embodiment of this invention. It is a schematic diagram which shows 4th Embodiment of this invention. It is a figure which shows the structural example for making the curvature of a reflective mirror variable in this invention. It is a figure which shows the other structural example same as the above. It is a schematic diagram which shows an example of the conventional sunlight lighting apparatus. It is a figure which shows a simulation result similarly.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Windshield dome 12 support | pillar 13 1st reflective mirror 14 2nd reflective mirror 15 support | pillar 16 opening part 17 adjustment mechanism 20 support bracket 21 oblong hole 22 frame 23 bolt 24 actuator

Claims (6)

  The first reflecting mirror that tracks the sun with the reflecting surface facing upward and always reflects sunlight toward the front, and the reflecting surface is disposed downward in front of the first reflecting mirror. And a second reflecting mirror that reflects the reflected light from the first reflecting mirror downward.   2. The adjusting mechanism for adjusting the vertical position of the second reflecting mirror in accordance with a change in the reflecting direction to the second reflecting mirror accompanying the sun tracking of the first reflecting mirror. Solar daylighting equipment.   The solar light collecting device according to claim 1 or 2, wherein the second reflecting mirror is a convex mirror.   4. The sunlight collecting device according to claim 1, wherein the first reflecting mirror is a concave mirror.   The solar light collecting apparatus according to claim 3 or 4, wherein the curvature of at least one or both of the second reflecting mirror and the first reflecting mirror is variable.   6. The solar light collecting device according to claim 1, wherein both the first reflecting mirror and the second reflecting mirror are accommodated in a common windshield dome.

Images