JPH07296617A - Sun light collector - Google Patents

Abstract

PURPOSE: To allow arrival of light deep in a room without generating spectra by providing plural convex stripes, having arc-shaped curve edges in section, in parallel on at least one surface of a flat plate-like transparent body. CONSTITUTION: In this sunlight lighting device, plural monofilaments or rod-like bodies 1 are glued on a transparent plate or film 4 side by side in parallel. One surface on the side of plural convex stripes 3 having arc shapes in section, on which the monofilaments or rod-like bodies 1 are exposed, is set to a first surface P1 , i.e., a sunlight incident surface, while the other surface is set to a second surface P2 , i.e., a sunlight emitting surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a daylight collector, and more particularly, to a daylight collector that converts parallel rays of sunlight incident from an oblique direction into diffused light in one direction to increase light utilization efficiency.

[0002]

2. Description of the Related Art Regarding the lighting of sunlight, various devices have been developed due to the problem of sunshine in the city. A typical example is a sunlight tracking type lighting device. In short, this device moves the light receiving device while following the operation of the sun, and causes the light collected by the light receiving device to be emitted to the room through an optical fiber. Further, a reflector is used for the light receiving device, and the light reflected by the reflector is applied to the room.

[0003]

However, the sunlight tracking type daylighting device is intended to illuminate a place where the sun is not exposed, and is not for improving the utilization efficiency in the place where the sun is exposed. In fact, even when the sunlight hits the window of the room, the situation that the light reaches deep inside the room is
Only when sunlight is incident from the front of the window due to direct sunlight on the morning sun or the western sun, most of the time, sunlight is incident from above the window or from the side diagonal direction. , Never reach deep inside the room.

The simplest way to light a room with light that strikes the window glass is to use frosted glass for the window glass. It is possible to make the room bright by the scattered light of sunlight incident on the frosted glass. However, due to the irregular scattered light, the utilization efficiency of sunlight is naturally limited.
A prism may be used to maximize the utilization efficiency of sunlight, but it is possible to make the light reach deep inside the room by defining the straight traveling direction of the light incident on the prism. However, since the light incident on the prism is split and emitted, the interior is illuminated with seven rainbow colors, which is not practical.

It is an object of the present invention to provide a daylight collector for sunlight that allows light to reach deep inside a room without causing a spectrum like a prism.

[0006]

In order to achieve the above-mentioned object, the sunlight collecting device according to the present invention is a sunlight collecting device which has a transparent body and which changes the direction of incident light of sunlight and emits it. The transparent body has a substantially flat plate shape, and has a first surface and a second surface, and the first surface and the second surface are front and back surfaces of the transparent body, and the first surface or the second surface. At least one of the two surfaces has a large number of middle-height ridges arranged in parallel, and the ridges have arcuate curved edges in the cross section, and one of the first surface and the second surface is The sunlight incident surface and the other surface are emission surfaces, and the emission surface diffuses and emits the sunlight transmitted through the transparent body only in the direction orthogonal to the column direction of the ridges.

The transparent body is formed by closely arranging a plurality of monofilaments or rod-shaped bodies in parallel, and a part of the peripheral surface of each monofilament or rod-shaped body forms a ridge.

A plurality of monofilaments or rod-shaped bodies are arranged in parallel on a transparent plate or film in a single layer and integrated, and either the surface of the transparent plate or the surface on which the plurality of monofilaments or rods are exposed is selected. It is used as the incident surface of sunlight.

The ridges are formed integrally with a plate-shaped transparent body.

[0010]

Operation: One surface of the transparent body is used as the incident surface of sunlight, and light incident on this surface at an angle is refracted in the transparent body and is emitted from the other surface. ,
As shown in FIG. 1, with respect to the direction of the incident light L ₁ , the emitted light L ₂ becomes diffused light in a direction orthogonal to the row direction of the ridges and irradiates deep inside the room.

In the present invention, the arcuate curved edge is a curved edge formed by at least a part of a circle, an ellipse, a hyperbola, and a contribution line, and each ridge extends in a direction perpendicular to its lengthwise direction. It is formed on the outer edge of the cross section.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 2, this embodiment is an example in which a monofilament having a circular cross section or a rod-shaped body is used for the protrusion. A plurality of monofilaments or a plurality of rod-shaped bodies 1 are in contact with each other and arranged in parallel. As a result, the combination of each monofilament or rod-shaped body becomes the transparent body 2, and the ridges 3 are formed on both surfaces thereof.

In order to hold a single-layer row of a plurality of monofilaments or rod-shaped bodies 1 in a fixed form, the rows may be bonded in parallel to the transparent plate or film 4 in a row. In this case, the transparent plate or film 4 is merely a monofilament or rod-shaped body for holding the shape, and does not function as a daylighting device. Therefore, when the laminated body of the monofilament or rod-shaped body 1 and the transparent plate or the film 4 is used as a light collector, the surface of the transparent plate or the film 4 or the monofilament,
Either side of the surface on which the rod-shaped body is exposed to the first surface P _1, sunlight is incident from the first surface P _1, the second side P ₂ of the other
When the light is emitted further, the emitted light diverges and the daylighting function shown in FIG. 1 is obtained.

The rows of the protrusions 3 are transparent bodies 2 as shown in FIG.
It can also be obtained by integrally molding with the plate surface of. In this case as well, one of the surfaces is used as the first surface P ₁ to allow sunlight to enter, but ridges may be integrally formed on both surfaces of the transparent plate. Also in this case, if one of the surfaces is selected as the sun incident surface and sunlight is incident on the sunlight, the sunlight that passes through is diffused and emitted only in the direction orthogonal to the row direction of the ridges.

4 (a) to 4 (f) show an example of construction of the present invention. In FIG. 4, reference numeral 5 indicates the daylight collector of the present invention, and the arrows indicate the direction of the row of protrusions. When the daylighting device 5 of the present invention is attached to the window glass 6, it may be attached to the entire surface of the window glass 6, but it can be effectively obtained by attaching it to a part of the outer edge of the window glass as shown in FIG. When attaching the daylighting device 5, only one surface of the daylighting device 5 may be attached to the window glass 6. The parallel light radiated to the daylighter 5 is refracted inside the daylighter 5 as shown in FIG. Illuminate deeply. Particularly, it is effective for lighting when the sun is tilted upward or sideways and enters the window.

Light incident from an oblique direction often illuminates only the corner of the window glass. By concentrating the light collectors 5 on the corners of the window glass 6 illuminated by sunlight, the brightness can be kept indoors for a long time.

(Examples) Examples of the present invention will be shown below.

(Example 1) Polymer optical fibers having a diameter of 0.25 mm are arranged in a row in a row so as to be in contact with each other, and a transparent adhesive film is attached and fixed thereon, and the width is 10 cm and the length is 10 cm.
A cm light collector was created.

When a commercially available red laser pointer was used to irradiate this with light in the fog of dry ice, the irradiating light was diffused through the light collector as shown in FIG. This spread
It only occurred in the axial direction, which was orthogonal to the fiber rows. In this case, the incident angle was changed in the plane orthogonal to the light collector incidence surface in the direction of the fiber array, but the change in the most distributed band of diffuse transmitted light with respect to the normal line of the light collector was smaller than the change of the incident angle. It was about half that amount. Table 1 shows the incident angle, the ratio of transmitted light, and the distribution of diffused light at this time.

[0020]

[Table 1]

(Example 2) width 60 cm, height 20 cm,
A box having a depth of 2 cm and one side of 60 × 20 cm opened was prepared. This inner wall is all black and 20x2
A window of 10 × 10 cm was provided in the center of one surface of 0 cm, and a transparent acrylic plate was attached.

On the other hand, a strip of thick black cloth was attached to the open surface of the box so that the light entering from the open surface was minimized. This was installed horizontally with the window facing south, and the sunlight that was approximately south-centered was introduced into the box through this window, and the daylight collector of Example 1 was attached to the window, and this was not attached. The illuminance was compared with the case. In addition, the direction of the ridge of the daylight collector was set to be just beside. The illuminance was measured immediately before the surface farthest from the window of the box with the sensor surface of the illuminometer facing the window. The results are shown in Table 2.

[0023]

[Table 2]

(Embodiment 3) As a light collector, a transparent acrylic plate having a thickness of 3 mm and integrally formed in one row with ridges having a size corresponding to a diameter of 0.25 mm was used. When an experiment similar to that of Example 1 and Example 2 was carried out using this light collector, almost the same results as those of Examples 1 and 2 were obtained.

[0025]

As described above, according to the present invention, the direction of the sunlight incident on the first surface of the flat plate without causing the spectrum is diffused only in the direction orthogonal to the row direction of the ridges, and the sunlight is diffused from the second surface. Since it is to be emitted, when the sunlight is taken into the room using the daylighting device of the present invention, the parallel light of the sunlight particularly incident from an oblique direction is converted into diffuse light having regularity in a specific direction, It has the effect that it can be introduced deep into the room to ensure the brightness of the room.

[Brief description of drawings]

FIG. 1 is a diagram showing a lighting situation according to the present invention.

FIG. 2 is a diagram showing an embodiment of the present invention.

FIG. 3 is a diagram showing another embodiment of the present invention.

4A to 4F are diagrams showing an example of construction of a daylighting device.

FIG. 5 is a diagram showing a situation of lighting in a room.

[Explanation of symbols]

 1 monofilament or rod-like body 2 transparent body 3 ridge 4 transparent body or film 5 daylighter 6 window glass 7 room

Claims (4)

[Claims] 1. A solar daylight collector having a transparent body for converting the direction of incident light of sunlight and emitting the light, wherein the transparent body has a substantially flat plate shape, It has two surfaces, the first surface and the second surface are the front and back surfaces of the transparent body, and has a large number of medium-height protrusions in parallel on at least one of the first surface and the second surface. The ridge has an arcuate curved edge in a cross section, and one of the first surface and the second surface is an incident surface of sunlight,
The other surface is an exit surface, and the exit surface diffuses and outputs the sunlight passing through the transparent body only in the direction orthogonal to the row direction of the ridges. 2. The transparent body is one in which a plurality of monofilaments or rod-shaped bodies are closely arranged in parallel, and a part of the peripheral surface of each monofilament or rod-shaped body forms a ridge. The sunlight collector according to claim 1. 3. A plurality of monofilaments or rods are
It is arranged in parallel on a transparent plate or film in a single layer and integrated, and either the surface of the transparent plate or the surface where multiple monofilaments or rods are exposed is selectively used as the incident surface of sunlight. The sunlight collector according to claim 2. 4. The sunlight illuminator according to claim 1, wherein the ridge is formed integrally with a plate-shaped transparent body.