JP6233565B2 - Horizontal light duct - Google Patents

Description

  The present invention relates to a horizontal light duct.

Conventionally, an illumination method has been proposed in which sunlight is taken into a building interior and used as a light source for illumination.
One of them is a method of illuminating the interior of a building by guiding sunlight indoors through a light duct and emitting light from a light emission port.
The light duct includes a vertical type that introduces sunlight taken in from a roof or a rooftop in a downward direction and a horizontal type that introduces sunlight taken in from a wall surface of a building in a horizontal direction.
Since the vertical light duct is disposed over the top and bottom of the building, the floor area is reduced by installing the light duct.

On the other hand, the horizontal type optical duct (hereinafter referred to as the horizontal type optical duct) decreases the total building area by increasing the floor height for installing the horizontal type optical duct, but the optical duct is stored in the ceiling pocket etc. If it can be done, since the increment of the floor height is small, a decrease in the floor area can be suppressed.
However, the horizontal light duct guides light using a specular reflection surface provided on the inner wall of the horizontal light duct, for example, as shown in FIG. 12, and the specular reflection surface of the lighting section of the horizontal light duct is As shown in FIG. 12 (a), the specular reflection surface made of a flat surface is inclined so as to face the sun, or as shown in FIG. 12 (b), the specular reflection surface becomes a curved surface. There are many. Then, as shown in FIGS. 12A and 12B, the sunlight reflected by the specular reflection surface of the lighting section of the horizontal light duct is reflected in the horizontal light duct, for example, as shown in FIG. Repeatedly, it is transported to the place where light is to be guided. Therefore, the attenuation of light due to reflection is large.

  Further, when the solar altitude is high, it is transported while repeating specular reflection at a small incident angle, and the number of specular reflections increases, so that the amount of light that can be guided decreases. In order to reduce the number of specular reflections, it is conceivable to increase the duct height, but a horizontal optical duct with a large duct height may not fit in the ceiling pocket. The duct back here means the width in the height direction of the optical duct in a horizontal state.

  Further, in a horizontal light duct, as shown in FIG. 14, in order to increase the amount of light that can be guided, a system including a movable portion 104 for automatic tracking of the sun that automatically adjusts the inclination angle of the reflecting surface 104a in accordance with the solar altitude. Has also been proposed (see, for example, Patent Document 1). In FIG. 14, 100F is an upper floor slab, 100B is an upper floor veranda, 101 is a light emitting portion, 102 is a light guide duct, 103 is a light collecting means, 103a is a concave mirror, and 103b is a convex mirror. .

Japanese Utility Model Publication 4-55365

However, when a movable part for automatic tracking of the sun is provided, there is a problem that the cost is increased correspondingly and the running cost is increased.
Moreover, since the movable part 104 for automatic solar tracking needs to be installed on the outdoor side of the veranda on the upper floor, the building area may increase. Furthermore, if sunlight is reflected to an unexpected place due to poor adjustment of the movable part 104 for automatic tracking of the sun, there is a possibility of light pollution.
Accordingly, the present invention has been made paying attention to the above-mentioned conventional unsolved problems, and an object thereof is to provide a horizontal light duct capable of guiding a larger amount of light without increasing the cost. It is said.

In one embodiment of the present invention, a daylighting unit that collects sunlight, a light guide unit that guides sunlight that has passed through the daylighting unit, and sunlight that is guided by the light guide unit are emitted into an indoor space. A horizontal light duct provided with a light emitting portion, wherein the daylighting portion is formed in a rectangular tube shape, and the traveling direction of sunlight when viewed from the side is horizontal along the direction in which the light guide portion extends. The traveling direction changing unit changes the traveling direction of the sunlight so that the traveling direction changing unit includes a photorefractive body and a specular reflection unit, and the specular reflection unit is fixed to the entire inner surface of the daylighting unit. The photorefractive body is formed in a prismatic shape, and the longitudinal direction of the photorefractive body faces the width direction of the daylighting unit in a space surrounded by the specular reflection unit in the daylighting unit. extending fixed so as to be perpendicular to the direction, one of said refractive body and the mirror reflection portion, or Horizontal optical duct, characterized by propagating the sunlight propagation path through the person is.

The refractive body and the mirror reflection portion, the position and orientation is not good be fixed.

  According to one aspect of the present invention, the solar light includes a photorefractive body and a specular reflector, and the solar light travels in a horizontal direction along the direction in which the light guide extends when viewed from the side. Since the lighting direction change part is provided in the daylighting part to change the direction and the direction of sunlight is changed at the entrance of the horizontal light duct, the number of reflections when guiding light can be reduced. As a result, it is possible to suppress the attenuation of the light amount, and to guide a larger amount of light to the light emitting unit.

It is sectional drawing which shows schematic structure of an example of the horizontal type optical duct to which this invention is applied. It is a perspective view which shows an example of the lighting part of FIG. 1, and a light guide part connected with this. It is explanatory drawing with which it uses for operation | movement description of this invention. It is explanatory drawing with which it uses for operation | movement description of this invention. It is a figure which shows the specific example of a lighting part. It is explanatory drawing with which it uses for operation | movement description of this invention. It is a fragmentary sectional view for demonstrating the schematic structure of the width direction of a lighting part. It is an example of the conventional horizontal type | mold optical duct. It is the figure which compared the effect of the conventional horizontal type optical duct and the horizontal type optical duct of this invention. It is a modification of the horizontal type | mold optical duct by this invention. It is a modification of the horizontal type | mold optical duct by this invention. It is explanatory drawing for demonstrating the conventional horizontal type | mold optical duct. It is explanatory drawing for demonstrating the conventional horizontal type | mold optical duct. It is explanatory drawing for demonstrating the conventional horizontal type | mold optical duct.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing a schematic configuration of an example of a horizontal optical duct 1 in the present invention. FIG. 2 is a perspective view showing an example of a light-guiding unit of the horizontal light duct 1 and a light guide unit connected to the daylighting unit.
As shown in FIG. 1, the horizontal optical duct 1 is disposed horizontally on the ceiling plate 93. The horizontal light duct 1 is guided by the daylighting unit 3 that collects the sunlight emitted from the sun 91, the light guide unit 5 that guides the sunlight emitted from the daylighting unit 3, and the light guide unit 5. And the light emission part 7 which emits the sunlight as illumination light of the indoor space 92.

The light guide 5 is formed in a substantially rectangular tube shape, and a specular reflector is provided on the entire inner surface of the light guide 5. The daylighting unit 3 is provided at one end opening of the light guide unit 5, and the light emission unit 7 is connected to the light guide unit 5 and includes a light emission port 7 a. The light emission part 7 is provided with the mirror reflection part 8 which changes the advancing direction of the guided light to the light emission port 7a side.
The daylighting unit 3 is provided so as to be inclined upward with respect to the light guide unit 5 to form an opening, and the opening is formed at an angle at which more sunlight can be incident according to the solar altitude during the day. Is done. The daylighting unit 3 is formed with a traveling direction changing unit that changes the traveling direction of sunlight.

That is, as shown in FIG. 1, the downstream side (hereinafter simply referred to as the downstream side) of the daylighting unit upper surface 3 a of the daylighting unit 3 in the sunlight guiding direction is the light guiding unit upper surface 5 a. It is joined to the upstream side in the light direction (hereinafter simply referred to as the upstream side), and the lighting unit upper surface 3a is joined with the upstream side inclined upward with respect to the light guide unit upper surface 5a.
The lower surface side of the daylighting unit 3 has a first lower inclined surface 3b whose length viewed from the side is approximately equal to the length viewed from the side of the daylighting unit upper surface 3a, and the downstream side of the first lower inclined surface 3b. And a second lower inclined surface 3d connected to the downstream side of the horizontal surface 3c, and the downstream side of the second lower inclined surface 3d is bonded to the light guide unit lower surface 5b.

  Then, a prismatic first refractor 4a extending in the width direction of the daylighting unit 3 is arranged at a corner portion formed by a joint between the daylighting unit upper surface 3a and the light guide unit upper surface 5a of the daylighting unit 3, and the first Between the refracting body 4a and the first lower inclined surface 3b, a prismatic second refracting body 4b extending in the width direction of the daylighting section 3 is disposed with a gap. The first refracting body 4a and the second refracting body 4b are made of, for example, a transparent material that is formed of glass, crystal, resin, or the like and can emit incident light by reflecting or refracting it.

The first refracting body 4a includes a first surface m1 facing the opening of the daylighting unit 3, a second surface m2, and a third surface m3 provided perpendicular to the light guide unit upper surface 5a. Prepare.
The second refractor 4b is incident on the first surface m11 facing the opening of the daylighting unit 3, the second surface m12 facing the first lower inclined surface 3b, and the second refractor 4b. The traveling direction of the emitted sunlight is changed so as to be horizontal along the direction in which the light guide unit 5 extends when viewed from the side, the fourth surface m14, the second surface m12, and the fourth surface m14. And a third surface m13 having a substantially horizontal plane formed therebetween.

A specular reflection material is formed on each of the lighting unit upper surface 3a, the first lower inclined surface 3b, the horizontal surface 3c, and the third lower inclined surface 3d to form a specular reflecting surface.
In the daylighting unit 3 configured in this way, the traveling direction of the incident sunlight is determined by passing through one or more of the first refracting body 4a, the second refracting body 4b, and each specular reflection surface. Change to be horizontal when viewed from the side. That is, the specular reflection formed on each of the first refracting body 4a, the second refracting body 4b, the lighting unit upper surface 3a, the first lower inclined surface 3b, the horizontal surface 3c, and the third lower inclined surface 3d. The surface constitutes the traveling direction changing unit.

There are three ways to change the direction of sunlight so that it is horizontal when viewed from the side. In the following description, changing the traveling direction of sunlight so as to be horizontal when viewed from the side is also referred to as leveling, and this method is also referred to as leveling method.
The first leveling method is based on refraction in the refractor and total reflection from the high refractor to the low refractor (air) by the first refractor 4a or the second refractor 4b. The third leveling method is based on the refraction in the refracted body by the first refracting body 4a or the second refracting body 4b and the specular reflection by the specular reflecting surface. It is.

  And the sunlight from the solar altitude 30 degree | times is leveled by either the 1st and 2nd leveling method. Sunlight from a solar altitude of 40 degrees is leveled using two types of refractors, that is, one of the first refractor 4a and the second refractor 4b. Sunlight from a solar altitude of 50 degrees is leveled by the first leveling method. Sunlight from solar altitudes of 60 degrees and 70 degrees is leveled using a third leveling method.

The sunlight from each solar altitude is leveled by these three leveling methods so as to proceed in a direction within ± 10 degrees from the horizontal when viewed from the side.
That is, as shown in FIG. 3, a part of the sunlight incident on the second refractor 4b out of the sunlight from the solar altitude 60 degrees is the first surface m11 of the second refractor 4b and the first surface. After being refracted and emitted from the second surface m12, it is reflected by the first lower inclined surface 3b and leveled.

Further, a part of the sunlight incident on the first refractor 4a is refracted by the first surface m1 of the first refractor 4a, reflected by the second surface m2, and reflected by the third surface m3. After being refracted and emitted, it is reflected and leveled by the light guide unit upper surface 5a.
Further, as shown in FIG. 4, a part of the sunlight incident on the second refractor 4b out of the sunlight from the solar altitude of 30 degrees is refracted by the first surface m11 of the second refractor 4b. Then, after being reflected by the second surface m12, it is refracted and emitted by the fourth surface m14 and leveled.
Of the sunlight from the solar altitude of 30 degrees, the sunlight that is directly incident on the second lower inclined surface 3b is reflected and leveled.
Note that the shape and material (refractive index) of the first refracting body 4a and the second refracting body 4b, the arrangement position, and the shape of the daylighting unit 3 are the areas where the horizontal light duct 1 is installed, specifically, It is set according to the latitude, longitude, and surrounding conditions.

Moreover, in FIG. 3, FIG. 4, the optical path of the sunlight by which the advancing direction is mainly leveled by the advancing direction change part among the sunlight which injects into the lighting part 3 is shown. As shown in FIGS. 3 and 4, sunlight incident on the daylighting unit 3 may be reflected not only in the optical path whose traveling direction is changed by the traveling direction changing unit, but also in each refracting body. Moreover, sunlight may be conveyed by routes other than FIG.3 and FIG.4.
3 and 4 show a case where a transparent refractor having a refractive index of 1.5 is used as the first refractor 4a and the second refractor 4b, and a specular reflector having a specular reflectance of 99% is used. It is an example.
For example, as shown in FIG. 5, the daylighting unit upper surface 3a is formed such that the angle formed with the light guide unit upper surface 5a is 50 degrees. The first refracting body 4a has a pentagonal shape in which the cross section is recessed at one corner, and the recessed corner is disposed along the angle formed by the light-collecting unit upper surface 3a and the light guide unit upper surface 5a.

  In the cross section of the first refracting body 4a, when the recessed corner is a point p1 and the other vertices are a point p2 to a point p5, the point p3 (the first surface m1 and the second surface m2 (Joint part) is located on the extension line of the light guide part upper surface 5a, the distance between the points p1 and p3 is “2.31k” (k is a coefficient representing the unit length), the points p2 and p3 are The angle formed by the line segment connecting the line segment connecting the points p1 and p3 is 30 degrees, and the angle formed by the line segment connecting the point p1 and point p3 and the line segment connecting the points p4 and p3 is 25 degrees, the point p1 and the point The angle formed by the line segment connecting p5 and the line segment connecting points p4 and p5 is set to 90 degrees. Further, the horizontal distance between the point p1 and the opening end face L is “3.71k”.

When the second refractor 4b has a quadrangular cross section, the apex formed by the first surface m11 and the fourth surface m14 is a point p11, and the other apexes around the left are the points p12 to p14. The angle formed between the line connecting point p3 and point p11 and the perpendicular is 60 degrees, and the angle formed between the line connecting point p11 and point p4 and the line connecting point p11 and point p14 is 52 degrees. It is.
The angle formed by the line connecting the points p11 and p12 and the line connecting the points p11 and p4 is 11 degrees, and the point p12 is a point on the opening end face L. The angle between the line connecting point p12 and point p13 and the horizontal line passing through point p12 is 18 degrees, and the angle formed between the perpendicular of the line connecting point p11 and point p12 and the line connecting point p11 and point p13 Is 23.3 degrees. A line segment connecting the points p13 and p14 is a horizontal line.

  In FIG. 5, the position where the upstream end of the first lower inclined surface 3b is in contact with the opening end surface L is the point p21, and the joint between the first lower inclined surface 3b and the horizontal surface 3c is the point p22, When a junction between the horizontal surface 3c and the second lower inclined surface 3d is a point p23, an angle formed by a line segment connecting the points p21 and p13 and a horizontal line passing through the point p13 is 1.5 degrees. The angle formed by the line connecting the points p21 and p13 and the line connecting the points p21 and p22 is 41 degrees, and the perpendicular of the line connecting the points p12 and p13 and the line connecting the points p13 and p22 are as follows. The angle formed is 27.8 degrees, and the angle formed between the horizontal plane 3c and the second lower inclined surface 3d is 12.5 degrees.

  The first refracting body 4a and the second refracting body 4b disposed in the daylighting unit 3 are schematically shown in FIG. 6 as viewed from the top surface of the first refracting body 4a and the second refracting body 4b. As shown, the boundary surfaces of each refractor viewed from above are parallel when entering and exiting. Therefore, as shown in FIG. 6, the traveling direction seen from above the transmitted light that passes through the two first and second refractors 4a and 4b is the first and second as shown in the circle in FIG. It does not change before and after passing through the second refractors 4a and 4b. That is, the azimuth angle of sunlight incident on the daylighting unit 3 is maintained.

Here, when the horizontal width of the horizontal optical duct 1 is wide, the number of reflections of sunlight in the width direction of the horizontal optical duct 1 is small, so that the reflection attenuation in the width direction is small. Therefore, it is not always necessary to take measures against the reflection loss of sunlight in the width direction, but the reflection attenuation in the width direction may be further reduced in the horizontal optical duct 1 in the present embodiment.
That is, in the horizontal light duct 1 in the present embodiment, even if the traveling direction of sunlight is changed so that the traveling direction of sunlight seen from above is parallel along the direction in which the light guide unit 5 extends. Good. Hereinafter, changing the traveling direction of sunlight so that the traveling direction of sunlight seen from above becomes parallel along the direction in which the light guide unit 5 extends is also referred to as parallelization.

  FIG. 7 shows an example of a horizontal light duct 1a that is further parallelized in the horizontal light duct 1 of the present invention, and is a partial cross-section for explaining a schematic configuration in the width direction of the daylighting section 3 It is a figure, Comprising: The upper half of the width direction of the horizontal type optical duct 1a is shown. The shape of the lower half is the shape of the upper half and the surface object. The horizontal light duct 1a is the same as the horizontal light duct 1 except that the side surface shape in the width direction of the daylighting unit 3 is different. Therefore, the same parts are denoted by the same reference numerals and detailed description thereof is omitted. .

  As shown in FIG. 7, the opposing side surfaces of the lighting unit 3 of the horizontal light duct 1a are not arranged in parallel to each other, but a plurality of specular reflection surfaces (in the case of FIG. Are arranged at a predetermined angle, and the distance between the side surfaces gradually increases as the distance from the opening of the daylighting unit 3 increases. It is arranged to be larger.

  Specifically, one or a plurality of specular reflection surfaces arranged on the side surface of the daylighting unit 3 is such that the traveling direction of sunlight reflected from these specular reflection surfaces as viewed from above extends along the direction in which the light guide unit 5 extends. The angles formed by the plurality of specular reflection surfaces are adjusted so as to be parallel to each other. The angles of the plurality of specular reflection surfaces are determined according to the solar azimuth angle of incident sunlight. That is, it is determined based on the area or longitude where the horizontal optical duct 1a is installed.

  For example, in FIG. 7, the side surface m51 is disposed at an angle of 30 degrees with respect to the horizontal line, the side surface m52 is disposed at an angle of 20 degrees, and the side surface m53 is disposed at an angle of 10 degrees. In addition, in FIG. 7, although the side surface of the lighting part 3 was demonstrated about the case where it forms with three side surfaces m51-m53, it is not restricted to this, It can form with arbitrary number of side surfaces, and the desired solar orientation What is necessary is just to form according to the range of a corner | angular.

  By joining a plurality of specular reflection surfaces with an angle as shown in FIG. 7, sunlight is reflected by the specular reflection surface according to the solar azimuth, and the traveling direction of sunlight is the direction in which the light guide unit 5 extends. Parallelized. Usually, since the horizontal light duct is arranged in parallel to the north-south axis, the traveling direction of light can be made parallel to the north-south axis by making it parallel. Specular reflection surfaces formed on both side surfaces of the daylighting unit 3 also constitute a traveling direction changing unit.

In this way, by making the traveling direction of sunlight parallel, the ratio of leading the captured light becomes higher. That is, since sunlight can be conveyed with a smaller number of reflections in the width direction, reflection attenuation in the width direction can be further reduced.
By the way, in order to make the traveling direction of sunlight parallel, as shown in FIG. 7, the duct width is widened by joining the specular reflection surface to the side surface of the daylighting unit 3 at a predetermined angle, and the duct width of the light guide unit 5 is increased. Is about four times larger than the opening of the daylighting unit 3.
That is, if the duct width is constant, the amount of light that can be taken into the horizontal optical duct is reduced to ¼ by parallelization.

  For example, a horizontal light duct (mirror reflectivity 99%) with a side surface of a daylighting part parallel and a duct length of 10 m, and a simple horizontal type without a specular reflector at the opening (tip). In the case of a light duct, that is, a horizontal light duct (hereinafter referred to as a simple light duct) in which the distance between the specular reflecting surfaces arranged on the side surfaces of the daylighting unit is constant, the simple light duct depends on the solar azimuth angle. The ratio of sunlight incident on the inside changes, and the ratio of the amount of guided light also decreases due to reflection attenuation.

On the other hand, as shown in FIG. 7, in the case of a laterally inclined horizontal optical duct 1a in which a plurality of specular reflection surfaces are joined to the side surface of the daylighting unit 3 at a predetermined angle, the relationship is related to the solar azimuth angle. It is possible to carry sunlight at a high rate.
However, in the case of the side-tilt-type horizontal optical duct 1a, as described above, the opening of the daylighting section 3 is about ¼ compared to the simple optical duct having the same light guide section duct width. Therefore, assuming that the duct width is the same, the opening of the lighting unit 3 is smaller in the horizontal light duct 1a than the simple light duct in which the side surfaces of the lighting unit 3 are parallel. That is, the amount of light taken in from the opening is small in the first place. The decrease in the amount of light due to the small opening is equal to the attenuation by the reflection of about 138 times on the side surface of the daylighting unit 3 when the specular reflectance of the duct inner wall is 99%.

  For example, when the duct width of the light guide portion 3 of the horizontal optical duct 1a of the side inclined type is the same as the duct width of the simple optical duct, the sun from the solar azimuth angle of less than 45 degrees and greater than 135 degrees The amount of light that guides light is higher in the side-tilt type horizontal light duct 1a than in the simple light duct with a duct width of 16.56m, which is very narrow, such as the duct width 12cm facing south. There is little light quantity to guide.

As shown in FIG. 7, the side surface of the daylighting unit 3 is formed by joining a plurality of specular reflection surfaces at a predetermined angle so as to be parallel to the north-south axis, as shown in FIG. The effect by having made the side surface of the lighting part 3 into the side inclination type | mold in (duct width 12cm, duct length 10m, an opening part faces south) is shown.
In Table 1, the ratio of guiding sunlight with the side-inclined horizontal light duct 1a (that is, the ratio of guiding sunlight taken in the daylighting section 3 to the light emitting section 7 of the horizontal light duct 1a) and the amount of light to be guided (That is, the amount of light that guides sunlight incident on the opening of the daylighting unit 3 to the light emitting unit 7 of the horizontal light duct 1a) is compared. In Table 1, the ratio of guiding the sunlight for each azimuth angle of the simple light duct (the side of the daylighting portion is parallel) when the ratio of the amount of light to be guided and the amount of light to be guided is “1”. And the amount of light to be guided. As shown in Table 1, the laterally inclined horizontal optical duct 1a is more efficient at all sun azimuth angles. In other words, from Table 1, the efficiency of the daylighting unit 3 can be improved by forming the side surface of the daylighting unit 3 by joining a plurality of specular reflection surfaces at a predetermined angle to parallelize sunlight incident on the daylighting unit 3. Recognize.

  Table 2 shows the amount of light that can be captured by the lighting side end face of the simple light duct (the side face of the lighting part is parallel) having a 45-degree inclined surface provided with a specular reflector at the lighting side end part shown in FIG. ”And the horizontal light duct 1 in the present embodiment shown in FIG. 1 shown in FIG. 1, that is, a traveling direction changing unit for leveling the traveling direction of sunlight, as shown in FIG. 9B. The amount of light that can be guided by the horizontal optical duct 1 containing the The specular reflectance in the simple light duct shown in FIG.

In Table 2, the efficiency of the horizontal light duct 1 does not include the amount of light that could not be leveled repeatedly reaching the reflection, but the horizontal light duct 1 is much more effective than the conventional simple light duct. It can be seen that a lot of light can be guided.
Table 2 shows the amount of light that can be guided at each solar altitude. For the conventional simple light duct as shown in FIG. 8, the amount of light that can be guided when the duct length is 10 m, 15 m, and 20 m is shown. . In the case of a simple light duct, it can be seen that the amount of light decreases as the length of the light duct increases, that is, as the transport distance increases.

As described above, the shape and position of each refractor 4a, 4b, the daylighting unit upper surface 3a, the lower inclined surfaces 3b, 3d, so as to level the sunlight at each solar altitude using the leveling method. By determining the inclination and length of the horizontal plane 3c, the traveling direction of sunlight from a plurality of solar altitudes can be efficiently leveled.
And since it can level horizontally in this way, in the light guide part 5, the frequency | count of reflecting sunlight can be reduced. As a result, the attenuation of the light amount due to reflection can be suppressed.
In addition, by appropriately determining the angle and length of the specular reflector disposed on the side surface of the lighting unit 3 of the horizontal light duct 1, the traveling direction of sunlight from a plurality of solar azimuths can be efficiently collimated. can do.

And since the advancing direction of sunlight can be leveled and parallelized in this way, the frequency | count of reflecting sunlight in the light guide part 5 in conveying sunlight can be reduced. As a result, attenuation of the light amount due to reflection can be suppressed, in other words, a larger amount of light can be led. In particular, by providing the traveling direction changing unit in the daylighting unit 3, it is possible to level and parallelize the traveling direction of sunlight at the entrance portion of the light guiding unit 5, so that the number of reflections at the light guiding unit 5 can be reduced. It can be reduced and is effective.
In addition, by combining the refractor and the specular reflector in this way, the mechanism for leveling can be made compact compared to the case where sunlight is leveled using only the specular reflection phenomenon. Can do.

  That is, when using only the specular reflection phenomenon to level sunlight, it is necessary to provide the same number of inclined specular reflecting surfaces as the number of solar altitudes to be leveled at the end of the light guide. At the same time, the mechanism for achieving the lengthening becomes longer, and at the same time, the angle-reflecting reflecting surfaces are laminated, so that the duct height increases. Therefore, in order to install such a horizontal optical duct with a large back in the ceiling, depending on the space of the ceiling, it is necessary to reduce the number of solar altitudes to be leveled and reduce the back of the duct. As a result, a time zone in which the amount of light that can be guided is reduced, that is, a time zone with low efficiency increases.

On the other hand, in this embodiment, not only the specular reflection phenomenon but also a refractor is used, and by transporting any one or a combination of these according to the solar altitude, the sunlight can be leveled with a more compact mechanism. Can be planned.
Further, by leveling and collimating sunlight, the light guide member does not need light reflectivity, and the manufacturing cost of the horizontal optical duct 1 can be reduced.
That is, by leveling and collimating the sunlight, it is possible to guide a certain amount of sunlight to a certain distance without giving the light guide member light reflectivity. Therefore, it can implement | achieve, without giving light reflectivity to a light guide member by leveling and parallelizing so that sunlight of a desired light quantity may be guided to the desired light emission opening.

Moreover, more sunlight can be guide | induced by leveling and parallelizing the advancing direction of sunlight in this way. Therefore, for example, as shown in FIG. 10, even when the light guide unit 5 bypasses the other equipment 95, the attenuation of the amount of light that can be guided by the increased reflection to bypass this can be allowed.
Further, if the amount of light that can be guided is sufficient, for example, as shown in FIG. 11, even if the sunlight is simultaneously guided to the plurality of light emission openings 7a and 7b, a sufficient amount of light can be introduced to each light emission opening. it can. In addition, 8a in FIG. 11 is a specular reflection part, Comprising: The specular reflection part 8a is comprised so that adjustment of inclination is possible, and as shown in FIG. 11, the light emission opening is inclined by inclining the specular reflection part 8a to about 45 degrees. It is possible to emit light from 7a, that is, to emit light from the light emission openings 7a and 7b. On the other hand, when the inclination of the specular reflection portion 8a is zero, that is, along the wall surface of the light guide portion 5, light can be emitted only from the light emission port 7b.

In the above-described embodiment, the daylighting unit 3 describes the case where the traveling direction of sunlight is leveled and parallelized. However, only the leveling of the traveling direction of sunlight may be performed. The amount of light to be guided can be increased simply by leveling the traveling direction of sunlight.
In the above embodiment, the case where two refractors, the first refractor 4a and the second refractor 4b, are provided. However, the present invention is not limited to this, and only one or three or more refractors are provided. You may combine bodies.
Moreover, in the said embodiment, although the solar height is leveling the sunlight of the range of 30 degrees-70 degrees, it is not restricted to the case where the sunlight of this range is leveled, It is set as desired. You may make it level sunlight of a solar height.

Moreover, although the said embodiment demonstrated the case where the advancing direction change part is provided in the lighting part 3, and leveling and parallelization are performed, for example, as shown in FIG. In the case of circumventing, for example, a traveling direction changing unit may be provided in the daylighting unit 3 and further arranged in a portion where the horizontal light duct is bent.
It should be noted that the scope of the present invention is not limited to the illustrated and described exemplary embodiments, but includes all embodiments that provide the same effects as those intended by the present invention.
Furthermore, the scope of the invention is not limited to the combinations of features of the invention defined by the claims, but can be defined by any desired combination of particular features among all the disclosed features.

DESCRIPTION OF SYMBOLS 1 Horizontal type light duct 3 Daylighting part 3a Daylighting part upper surface 3b 1st lower side inclined surface 3c Horizontal surface 3d 2nd lower side inclined surface 4a 1st refractive part 4b 2nd refractive part 5 Light guide part 5a Light guide part Upper surface 5b Light guide portion lower surface 7 Light emitting portion

Claims (2)

A daylighting unit for daylighting;
A light guide for guiding sunlight that has passed through the daylighting unit;
A horizontal light duct comprising a light emitting part for emitting sunlight guided by the light guide part to an indoor space,
The daylighting portion is formed in a rectangular tube shape, and the traveling direction change for changing the traveling direction of the sunlight so that the traveling direction of sunlight when viewed from the side is horizontal along the extending direction of the light guide portion. Part
The traveling direction changing unit includes a photorefractive body and a specular reflection unit,
The specular reflection part is fixed to the entire inner surface of the daylighting part,
The light refracting body is formed in a prismatic shape, and in the space surrounded by the specular reflection part in the light collecting part, the longitudinal direction of the light refracting body faces the width direction of the light collecting part and the light guide part extends. And fixed to be vertical,
A horizontal light duct that propagates sunlight through a propagation path that passes through one or both of the photorefractive body and the specular reflector.   The horizontal light duct according to claim 1, wherein a position and a posture of the light refracting body and the specular reflection unit are fixed.

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