JPH079287Y2 - Light duct - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION << Industrial Application Field >> The present invention relates to an optical duct for introducing sun rays indoors, and more particularly to an optical duct with an improved structure of an outdoor daylighting section.

<< Prior Art >> Conventionally, as this type of optical duct, for example, an optical duct 1 shown in FIGS. 7 to 9 is generally known. The optical duct 1 is mainly composed of a wide rectangular duct 2 having a low height and a flat rectangular tube shape. This duct 2 is installed horizontally from below the eaves of the building or below the balcony on the upper floor.
The sunlight rays that have been taken in at the outdoor side end are introduced into the indoor through the duct 2. The lighting part of the duct 2 is composed of a lighting window 3 and a mirror 4. As shown in FIG. 9, the sunlight rays taken in from the lighting window 3 are reflected by the mirror 4 and introduced into the duct 2 in the longitudinal direction. Has become.

The lighting window 3 is covered with a translucent plate-shaped cover 5.

<Problems to be solved by the invention> However, in the above-mentioned optical duct 1, it is necessary to increase the duct cross-sectional area in order to increase the lighting area and introduce a large amount of sunlight into the room. Accordingly, especially in the morning and evening when the incident angle is small, there is a problem that the light collecting area is small and the sunlight cannot be efficiently transmitted through the narrow space. Moreover, although a mirror is arranged on the inner side surface 2a of the duct 2 inside the daylighting window 3, even if the sunlight rays in the morning and evening enter through the daylighting window 3 as shown in FIG. Is small, and the number of reflections on the inner surface of the duct 2 is extremely large. For this reason, the reflection efficiency on the inner surface of the duct 2 cannot be ignored, and it is not possible to sufficiently guide the sun's rays into the interior of the duct 2.

For this reason, as shown in FIG. 9, the sunlight can be effectively collected during the day when the sun is relatively high, but the efficiency of light collection is significantly reduced in the morning and evening.

Further, in the conventional light duct 1, the plate-shaped cover 5 is horizontally attached to the daylighting window 3, so that the sun rays and the cover 5 form an acute angle α as shown in FIG. Was reflected on the surface of the cover 5 and escaped.

The present invention has been devised to effectively solve the above problems, and a first object thereof is to provide an optical duct capable of efficiently collecting sunlight rays in the morning and evening, and a second object. Is to minimize the sunlight reflected by the cover of the lighting window.

<Means for Solving the Problems> In order to achieve the above-mentioned object, the present invention provides a rectangular tube-shaped duct disposed substantially horizontally from the outdoors to the indoor, and a lighting window provided at the outdoor end of the duct. And a sunlight duct introduced from the daylighting window to be introduced indoors through the duct, wherein the daylighting window has an outdoor end of the duct whose side surface portion is inclined downward toward a tip. And a rising slope portion which is notched so as to be continuous with the lower surface of the duct and has a width dimension almost the same as that of the duct and which slopes upward from the lower end of the tip toward the outside, and the rising slope portion. A pair of substantially widened inclined portions each having an inclined surface continuous with the inner surface and having a substantially widened inclination when viewed in plan from the side of the rising inclined portion, and an inner surface of the enlarged inclined portion and a side surface of the duct. Inclination A pair of substantially triangular widening slopes each having a slope and having a narrow slope from the duct side end of the widening slope to the cutout side of the duct, and a mirror on at least the inner surface of the rising slope and the widening slope. Is provided.

Further, in order to reduce the sun rays reflected by the cover, it is preferable to cover the daylighting window with a light-transmitting cover that is convex upward and has a three-dimensional shape.

<Operation> In the light duct configured as described above, the sun rays during the day are reflected by the mirror of the upper inclined part and introduced into the back of the duct as usual, and the sun rays in the morning and evening are at a low angle to the daylighting window. After entering, the light is reflected by the mirror of the widened slanted portion or the narrowed slanted portion and introduced into the back of the duct, so that it is possible to satisfactorily illuminate in the morning and evening, and the illuminating time or the illuminating efficiency is significantly increased.

Also, when the lighting window is covered with a three-dimensional cover instead of a flat cover, the angle between the sun rays and the surface of the cover can be close to a right angle, so the sun rays reflected on the cover surface can be It can be decreased to increase the lighting efficiency.

<< Embodiment >> An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view of a lighting portion 12 of a light duct 11 according to the present invention. The characteristic part of this optical duct 11 is
Connect both side walls of the duct 14 located on both sides of the daylighting window 13 to the duct.
After widening toward the end of 14, the width is narrowed again, and the width of the end is approximately triangular so that the final side has almost the same width as the main part of the duct 14. The projecting portion 15 is formed by projecting in a shape, and the auxiliary mirror 16 is provided on the inner surface of the projecting portion 15 of the duct 14, and the cover 17 that covers the lighting window 13 is convex upward to form a three-dimensional shape. It is that. The details will be described below.

The optical duct 11 is mainly composed of a wide and low-height so-called flat rectangular tubular duct 14.

The reason for using such a flat duct 14 is to facilitate construction when passing the duct 14 through a beam or the like of a building and to secure a sufficient amount of light. And the light duct 11
The daylighting part 12 is disposed so as to project outward from below the eaves or below the balcony on the upper floor. Further, the duct 14 is horizontally arranged toward the inside of the room, and a secondary mirror 20 is arranged at the indoor side end thereof as shown in FIG. The sun rays reflected by the secondary mirror 20 are emitted to the room 21 on the north side, for example.

On the other hand, the daylighting section 12 includes a daylighting window 13, a primary mirror 22, an auxiliary mirror 16 and a cover 17. Here, the daylighting window 13 is formed by cutting out the outdoor end of the duct 14 so that the side surface of the duct 14 inclines downward toward the tip. The conventional lighting window 13 has a rectangular shape having the same width as that of the duct 2 as shown in FIG. 7 and FIG.
At 11, both sides of the daylighting window 13 project outward in the left-right direction of the duct 14 in a substantially triangular shape. Therefore, the area of the daylighting window 13 is wider than the conventional one by the amount of this overhang, and it is possible to take in as much sunlight rays in the morning and evening incident at a low angle as possible.

Further, it has an inclined surface continuous with the lower surface of the duct 14 and has an inclined surface 14a which has an almost same width dimension as the duct 14 and ascends upward from the lower end of the tip to the outside. 22 are provided. The primary mirror 22 is mainly for reflecting the sunlight in the daytime and guiding it to the back of the duct 14, and its operation is the same as that of the mirror 4 described in the conventional example.

Furthermore, the both side walls of the duct located on both sides of the lighting window 13 are the fourth
As shown in FIG. 5 and FIG. 5, when viewed in a plan view, it has a triangular shape and extends to the left and right sides. This overhanging portion 15 is a rising slope portion 14
a pair of substantially widened inclined portions 14b each having an inclined surface continuous with the inner surface of a and having a substantially widened inclination when viewed in plan from the side of the rising inclined portion 14a, and the inner surface and duct of the widened inclined portion 14b. 14 has a side surface that is continuous with the side surface of the widening slope portion 14b, and includes a pair of widening slope portions 14c having a substantially triangular shape that slopes narrowly from the end side of the widening slope portion 14b on the duct 14 side to the cutout side of the duct 14, An auxiliary mirror 16 is arranged on the inner surface of the inclined portion 14b. The morning and evening sun rays are reflected by this auxiliary mirror 16 and introduced into the interior of the duct 14.

Furthermore, in the present embodiment, the upper portion of the daylighting window 13 is covered with a cover 17 that is upwardly convex and has a three-dimensional shape to prevent rainwater and dust from entering the duct 14. The cover 17 is integrally formed of transparent plastic or the like. Further, the shape of the cover 17 is configured so that the lower end edge 17a thereof substantially coincides with the shape of the daylighting window 13 as shown in FIGS. 1, 3 and 6, and the front surface 17b has a daytime sun ray. It is inclined to form an angle close to a right angle.

The side surface of the cover 17 is composed of a first side surface 17c and a second side surface 17d that are triangular, and the rear surface 17e is substantially vertical. Similar to the front surface 17b described above, these side surfaces are also arranged so as to be substantially orthogonal to the morning and evening sun rays.

Next, the operation of this embodiment will be briefly described. The sun rays A during the day pass through the front surface 17b of the cover 17 and enter the primary mirror 22 as shown in FIG. The reflected ray A1 is reflected and introduced into the interior of the duct 14. On the other hand, the sunbeam B in the morning and evening with a relatively small incident angle is in front of the cover 17.
17b or the first side surface 17c to enter the auxiliary mirror 16,
It is reflected by the auxiliary mirror 16 and introduced into the interior of the duct 14.
At this time, even if the reflected light beam B1 is inclined with respect to the axis of the duct 14, the reflected light beam B1 can be introduced deep into the duct 14 by disposing a reflecting material on the inner surface of the duct 14.

In this way, the light duct 11 according to the present invention can illuminate not only during the daytime but also in the morning and evening, so that the luminosity is good.

In addition, the sun rays A and B and the front surface 17b or the first side surface of the cover 17
Since the angle formed by 17c is almost a right angle, the amount of sunlight reflected on the surface of the cover 17 is significantly smaller than in the conventional case. Therefore, it is advantageous in terms of lighting efficiency.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made based on the technical concept of the present invention. For example, the inner surface of the duct has a special mirror finish. Instead, a material having good reflectivity may be used, or only a material that does not consider the reflective performance of the inner surface may be used.

<Effects of the Invention> As described above, the present invention aims to increase the area of the daylighting window by forming the side walls of the ducts on both sides of the daylighting window as overhanging parts, and at the same time, the auxiliary mirrors provided on the inner surface of the overhanging part Since the sun rays of are reflected and introduced into the back of the duct, it is possible to efficiently extract the sun rays in the morning and evening.

Also, when the cover that covers the daylighting window is made into a three-dimensional shape that is convex upward, the angle formed by the sun rays and the surface of the cover can be made close to a right angle, so that the sun rays reflected on the cover surface can be prevented. Since the amount can be reduced, the lighting efficiency can be further improved.

[Brief description of drawings]

1 to 6 show an embodiment of the present invention, in which FIG. 1 is an exploded perspective view of a daylighting portion of a light duct, FIG. 2 is a sectional view of the light duct, and FIG. Sectional drawing of the daylighting part, FIG. 4 is a plan view of the daylighting part, FIG. 5 is a front view taken along the line VV of FIG. 3, FIG. 6 is a plan view of the cover, and FIGS. FIG. 7 is an exploded perspective view of a daylighting part of the light duct, FIG. 8 is a plan view of the daylighting part, and FIG. 9 is a sectional view of the daylighting part. 11 …… Optical duct, 12 …… Lighting part 13 …… Lighting window, 14 …… Duct 15 …… Overhang part, 16 …… Auxiliary mirror 17 …… Cover, 20 …… Secondary mirror 22 …… Primary mirror

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Machiko Watanabe 4-640 Shimoseido, Kiyose-shi, Tokyo Inside Obayashi Institute of Technology Co., Ltd. (56) References 59-12107 (JP, U) 15015 (JP, U) Actually open Sho 62-139004 (JP, U)

Claims (2)

[Scope of utility model registration request] 1. A duct comprising a rectangular tubular duct arranged substantially horizontally from outdoors to indoors, and a daylighting window provided at the outdoor end of the duct, and the sun rays taken in through the daylighting window are provided in the duct. Is a light duct adapted to be introduced indoors through the lighting window, the outdoor end of the duct being cut out such that its side surface part is inclined downward toward the tip, and the lighting window is inclined continuously with the lower surface of the duct. A rising slope having a surface and having substantially the same width dimension as the duct and rising upward from the lower end of the tip toward the outdoors; and an inclined surface continuous with the inner surface of the rising slope and having the slope of the rising slope. A pair of substantially widened widened inclined portions that are widened and inclined in plan view from the side, and an inner surface of the widened inclined portion and an inclined surface that is continuous with the side surface of the duct, and the duct side end of the widened inclined portion. From the side A pair of widening inclined portion substantially triangular to narrow ramped notch sides of the extract,
An optical duct, characterized in that mirrors are provided on at least the inner surfaces of the rising slope portion and the widening slope portion. 2. The light duct according to claim 1, wherein the daylighting window is covered with a translucent cover which is upwardly convex and has a three-dimensional shape.