JP2006073366A - Method and device for controlling light distribution, and greenhouse using device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and a device for controlling light distribution which make possible efficient utilization of a diffused light beam. <P>SOLUTION: A number of strips of boards or films of structures 1 having a lot of projected streaks U, each of which cross section is a part of approximate circle and surface is mirror plane, are arranged at predetermined intervals d so that their projected streaks U are parallel one another. When light L enters in a point i of the surface of the structure 1 at a certain incident angle, both of reflected and transmitted lights are diffused in cone plane, of which central axis C is parallel to the projected streaks U and has an apex at the point i, because of diffraction by the arranged projected streaks U. The diffuse reflection light beam Fr is diffused in the lengthwise half of the cone plane, while the diffuse transmitted light beam Ft is diffused in the other lengthwise half. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a technique for collecting sunlight or controlling a light beam from an artificial light source without having a driving means.

  In the Venetian blind disclosed in Patent Document 1 filed by the present applicant, a plurality of ridges each having a right-angle cross-section forming a part of a circle are formed on the upper surface of the outdoor side portion that bisects each transparent blade. The structure is arranged so that they are close enough to be orthogonal to the longitudinal direction of the blade, and the sunlight reflected by this surface diffuses almost symmetrically about the axis of the ridge and the axis parallel to the longitudinal direction of the ridge. The light impinges on the lower surface of the indoor portion of the blade located immediately above, and is diffused and transmitted substantially symmetrically about an axis parallel to the longitudinal direction of the ridges similarly provided in the longitudinal direction of the blade. It was widely diffused toward.

  Patent Document 1 also introduces light into areas or parts that are shaded by diffused light that passes through the surface of a plate-like or film-like structure having a similar row of protrusions, or a specific area or part. Also disclosed is a light distribution control device that reduces the glare by uniformly diffusing the luminous flux of the lamp.

JP 2002-81275 A

  However, the arrangement of the protrusions required for such blinds and light distribution control devices requires advanced manufacturing techniques, and it is not easy to stably realize satisfactory shapes and functions. For this reason, the symmetry of the diffused light beam with respect to incident light at a large azimuth angle is not sufficient. Also, in the use of diffused light transmitted through the surface of the structure, much light is reduced due to the surface reflection of the structure, leaving room for improvement in energy utilization efficiency.

The present invention has been made to solve such problems, and a light distribution control method and apparatus that enables efficient use of diffused light beams are further improved by a manufacturing technique close to the limit of today's technical level. It is not intended to be required, but the purpose is to realize the structure by designing and using it.
Another object of the present invention is to provide a greenhouse using such a light distribution control device.

  The light distribution control method according to the present invention is a plate-like or film-like structure having at least light transmissivity or light reflectivity, and has a large number of protrusions arranged in parallel and sufficiently close to each other on at least one surface thereof. The cross-section of the ridges that have ridges and are orthogonal to the longitudinal direction of the ridges form a part of a circle, and the surface of those ridges has a substantially mirror surface. In this method, light is diffused in a conical or semi-conical shape with a line passing through the incident point and parallel to the ridge as the central axis.

Here, the “substantial mirror surface” can be defined as follows.
Incident light on a surface where the unevenness of a predetermined surface of the structure is sufficiently smaller than the wavelength of light is specularly reflected. On the other hand, when the unevenness is equal to or greater than the wavelength of light, it is diffusely reflected (diffuse reflection). It is known. A surface that undergoes specular reflection is generally called a “mirror surface”.
When most of the target surface is composed of “mirror surface” or “mirror surface” that is distributed almost uniformly, the ratio of the total area of the mirror surface to the area of the predetermined surface (the mirror surface ratio) is What is considered to be in a reasonable range for an application is defined as “substantially specular”. For example, because of the required function of the mirror, most of the incident light must be specularly reflected, and the specular ratio will be about 0.9 or more.

  The light distribution control device according to the present invention is a plate-like or film-like structure having at least light transmissivity or light reflectivity, respectively, and is parallel to each other and sufficiently close to each other on at least one surface thereof. A plurality of structures each having a ridge and a section of the ridge perpendicular to the longitudinal direction of the ridge form a part of a circle, and the surfaces of the ridges are substantially mirror surfaces. A cone whose ridges are parallel and arranged so that their surfaces face each other at a predetermined interval in parallel, and a light beam incident on the ridge of each structure has a central axis as a line parallel to the ridge The diffused light propagating in a planar or semi-conical shape is directed in the direction in which light is to be distributed.

In addition, Preferably, many protrusions are each formed on both surfaces of each structure.
Moreover, each structure can be formed in the shape of an elongated plate or film, and a large number of protrusions can be formed along the direction intersecting with the longitudinal direction of each structure. In this case, each structure may have a bent or V-shaped cross section perpendicular to the longitudinal direction.
It is preferable to further include an adjustment mechanism that changes the angle of each structure with respect to the arrangement direction of the plurality of structures.

  The light distribution control device of the present invention is installed in a window into which external light is inserted, and a plurality of structures are arranged along the surface of the window so that diffused light from the protrusions of each structure can be taken indoors. It is installed above the shaded part of the building and in a place where external light is inserted, and diffused light from the ridges of each structure is taken toward the shaded part of the building, or the ceiling part of the greenhouse and Installed in at least one of the walls or in the vicinity thereof, diffused light from the protrusions of each structure can be taken into the greenhouse.

Moreover, the greenhouse which concerns on this invention installs the above-mentioned light distribution control apparatus in at least one or its vicinity among a ceiling part and a wall part.
Note that at least one of the ceiling part and the wall part of the greenhouse can also be formed by a light distribution panel in which the light distribution control device is sandwiched between transparent plates having a double structure.

  According to the present invention, it is possible to improve the symmetry of light diffusion and to efficiently use a diffused light beam without requiring further improvement in manufacturing technology close to the limit of today's technical level.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
The inventor of the present application prototyped light diffusing structures having protrusions using optical fibers and round bars of various diameters, and as a result of examining the light distribution of diffusion, a large number of protrusions were parallel to each other and sufficiently When the curved edges of the cross-sections of the protrusions are arcs and the surface of the protrusions is almost mirror-like, the light rays A incident on a point i on the surface of the structure are Due to the diffraction effect due to the arrangement of stripes, in both reflection and transmission, the light diffuses in the shape of a cone with the point i as the apex. In such a diffused light beam, the diffusely reflected light beam spreads in the shape of a half-conical surface and diffuses and transmits It was found that the light beam spreads in the shape of the remaining half-conical surface.

  Such conical planar diffusion further has the following characteristics. First, as shown in FIG. 1, an orthogonal coordinate system is assumed in which a straight line passing through the point i and parallel to the longitudinal direction of the ridge U is defined as the Y axis, and the X axis and the Z axis perpendicular thereto are added. In this Cartesian coordinate system, if the thickness of the planar structure is ignored, the YZ plane becomes the structure, and this is the plane S. XZ orthogonal to the Y axis at the coordinate origin O below the point i. A surface is a surface T, an axis passing through a point i and parallel to the Z axis is a Z ′ axis, and a surface including the Z ′ axis and intersecting the surface S at an acute angle α is a surface P.

  The light ray A traveling on the surface P and incident on the surface S at the point i is defined as a and a ′ at the intersections of the reflected light and transmitted light and the surface T when the surface S is assumed to be a mirror surface. And the half circumference of a circle having a radius of line segments Oa and Oa ′ connecting a ′ and the origin O is a cross section by the surface T of the diffusely reflected and diffused light beams of the light beam A, respectively. Here, like the incident light B on the surface S of the structure, as the acute angle β passing through the incident point i and parallel to the ridge U and perpendicular to the surface S increases, The spread will increase.

  Further, the brightness in the diffusion direction of the diffused light beam has a maximum value in the direction of the reflected light and the transmitted light when the surface S is assumed to be a plane mirror surface, and the brightness is in the direction of the maximum value as the distance from the maximum value direction increases. It becomes low in some uniform relation to the angle. The luminance distribution in the diffusion direction of the diffused light beam (hereinafter referred to as the luminance distribution of the diffused light beam) is made more uniform by selecting the circumferential angle of the ridge cross section, the maximum diameter, and the degree of proximity between the ridges. Distribution.

  As an example of these selections, the circumferential angle of the protrusion cross section and the interval between the protrusions are changed for each protrusion having a radius of 1 mm, 0.5 mm, and 0.125 mm, and the application of the present invention described below is applied. The tolerance of performance as a light distribution control device in the field was evaluated by a total of three persons: an engineer H1, a market developer H2, and a planned sales person H3. The evaluation results are shown in Table 1 below. The evaluation was performed in three stages: 1: Applicable, 2: Applicability depends on the purpose of use, 3: Difficult to apply.

Embodiment 1 FIG.
FIG. 2 shows a light distribution control apparatus according to the first embodiment. This light distribution control device includes a plurality of elongated plate-like or film-like structures 1 each having a large number of protrusions U as described above. In each structure 1, the protrusions U are formed so as to intersect with each other in the longitudinal direction of the structure 1, specifically, in an orthogonal direction. These structures 1 are arranged so that the protrusions U are parallel to each other and the surfaces of the structures 1 are parallel to each other with a predetermined distance d. In FIG. 2, the ridge U is schematically represented by a simple line segment in order to show the direction of formation, but actually, the cross section forms a part of a circle and the surface is substantially the same. The ridges U, which are typical mirror surfaces, are juxtaposed in close proximity to each other on the surface of the structure 1.

  Each structure 1 has both light transmittance and light reflectivity. As shown in FIG. 2, when a light beam L is incident on a point i on the surface of the structure 1 at a certain angle of incidence, Due to the diffraction effect due to the arrangement, both reflection and transmission are diffused in the shape of a cone having the point i as the apex and a line parallel to the ridge U as the central axis C, and the diffuse reflected light beam Fr has a half-conical shape. It spreads in a planar shape, and the diffusely transmitted light beam Ft spreads in the shape of the remaining half-conical surface. Here, the central axis C of the diffused light beam always faces in the direction parallel to the ridge U regardless of the incident angle of the light beam L, and is incident on the surface of the structure 1 as shown in FIG. 3A, for example. Both the incident light beam L1 having an angle θ1 and the incident light beam L2 having an incident angle θ2 are diffused into a conical surface having a central axis C oriented in the same direction.

  Therefore, the light distribution control device is arranged so that the protrusion U of each structure 1 faces in the direction in which light distribution is to be performed. As a result, the light incident on the surface of each structure 1 is diffused in the shape of a cone having a central axis C in the direction parallel to the ridge U, that is, the direction in which light is to be distributed, in both reflection and transmission. To do. In this way, light can be efficiently diffused in a desired direction for light distribution.

In addition, when the structure 1 has at least light transmittance, the protrusion U may be formed on any of the main surfaces of the structure 1 facing each other. For example, although the structure 1 in FIG. 2 has the protrusion U on the upper surface, the protrusion U can also be formed in the lower surface. If the protrusions U are formed on both of the main surfaces facing each other, the diffusion effect is further improved.
Further, when the structure 1 does not have light reflectivity but has only light transmissivity, the diffusely transmitted light beam Ft in FIG. 2 only spreads in the shape of a lower half-conical surface. Thus, light distribution in a desired direction is possible.

  On the other hand, when the structure 1 has only light reflectivity without light transmittance, the diffusely reflected light beam Fr in FIG. 2 only spreads in the shape of the upper half-conical surface. Light distribution in a desired direction is performed. As described above, when the structure 1 has only light reflectivity, the protrusions U may be formed only on the surfaces of the structure 1 that are opposed to each other and irradiated with incident light. However, if the ridges U are formed on both surfaces, the diffusely reflected light flux by the ridges U on the upper surface of the lower structure 1 is directly above the structure 1 like the incident light beam L3 in FIG. Since it is diffused by the protrusions U on the lower surface, more efficient diffusion light distribution is realized.

As the protrusion U, for example, those having various cross sections as shown in FIGS. 4A to 4H can be used. However, the protrusion U substantially forms a part of a circle, and the surface of the protrusion U is substantial. It must be a mirror surface. The diameter of each protrusion U is preferably less than 3 mm and 50 μm or more.
As shown in FIGS. 4A, 4E, 4G, and 4H, when the structure 1 is formed by connecting the arcs of the protrusions U adjacent to each other, the actual commercial production technique is used. 5, the circumferential angle of the arc of the ridge U is 140 degrees or more, and the straight portion extends from the end point of the arc to the tangential direction from the vertex of the ridge U to a depth substantially equal to the radius of the ridge U. It is provided until it reaches the point, and in this respect, it comes into contact with the adjacent ridge U so that commercial production by extrusion molding becomes possible.

Embodiment 2. FIG.
FIG. 6 shows a light distribution control device according to the second embodiment. This light distribution control device is the same as the light distribution control device of the first embodiment, but includes an adjustment mechanism 2 that changes the angles of a plurality of parallel structures 1. As the adjustment mechanism 2, a mechanism for changing the inclination of a plurality of blades of a general-purpose blind can be used.
Since the adjusting mechanism 2 is provided, the angle of each structure 1 can be easily changed according to the direction in which light is to be distributed.

Embodiment 3 FIG.
In the light distribution control device of the first embodiment, each structure 1 has a flat plate shape. However, as shown in FIG. 7, the cross section perpendicular to the longitudinal direction has a bent shape or a V shape. The body 1 can also be used. That is, the structure 1 has an outer portion 3 and an inner portion 4 which are divided into two in the longitudinal direction, and projects on the surfaces 3a and 4a of the outer portion 3 and the inner portion 4 in directions orthogonal to the longitudinal direction, respectively. Article U is formed. Moreover, the structure 1 shall have light transmittance and light reflectivity.
As shown in FIG. 8, by arranging a plurality of structures 1 having such a bent cross-sectional shape in parallel with each other at a predetermined interval, the light distribution control device according to the third embodiment is provided. It is configured.

  For example, the light distribution control device is arranged such that the outer portion 3 is positioned on the side where light from the light source such as sunlight or artificial light is inserted, and the protrusions U of the inner portion 4 are directed in the direction of light distribution. . Like the incident light beam L4, light that is directly incident on the surface 4a of the inner portion 4 has a diffraction effect due to the arrangement of the ridges U, and a line parallel to the ridge U is reflected from the central axis C in both reflection and transmission. It spreads in the shape of a cone. Since the structure 1 has a bent cross-sectional shape, when the light is incident on the back surface 3b of the outer portion 3 like the incident light beam L5, the light reflected by the back surface 3b of the outer portion 3 is the inner portion of the structure 1 immediately below. 4 is incident on the surface 4a of the light source 4 and diffuses in the shape of a cone having a line parallel to the ridge U as the central axis C. Of the incident light L5, the light transmitted through the outer portion 3 is diffused by the protrusions U on the surface 3a of the outer portion 3, and further, the light incident on the surface 4a of the inner portion 4 is diffused. It diffuses in the shape of a cone having a central axis C at the ridge U of the surface 4a. The final diffusion direction in this light distribution control device is determined by the direction in which the protrusions U of the inner portion 4 are directed, and this is the direction of light distribution. Thus, by using the structure 1 having a bent cross-sectional shape, light from the light source can be taken in more efficiently and light can be diffused in the direction of light distribution.

  In addition, the protrusion U may be formed not on the front surfaces 3a and 4a of the outer portion 3 and the inner portion 4 of the structure 1, but on the back surfaces 3b and 4b. The protrusions U can be formed on one surface and the other back surface of the outer portion 3 and the inner portion 4, respectively.

  Further, preferably, protrusions U are formed on both the front surfaces 3a and 4a and the back surfaces 3b and 4b of the outer portion 3 and the inner portion 4 in a direction perpendicular to the longitudinal direction. In this way, as shown in FIG. 9, for example, the light incident on the back surface 3 b of the outer portion 3, such as the incident light beam L <b> 6, is parallel to the protrusion U on the back surface 3 b of the outer portion 3. A line is diffused into a conical surface having a central axis C1, and a diffusely reflected light beam is incident on the surface 4a of the inner portion 4 of the structure 1 directly below, and is parallel to the protrusion U of the surface 4a of the inner portion 4. It further diffuses into a conical surface with a straight line as the central axis C2. Further, the diffuse transmitted light beam diffused on the back surface 3b of the outer portion 3 is incident on the surface 4a of the inner portion 4 of the same structure 1, and a line parallel to the ridge U of the surface 4a is defined as the central axis C2. It spreads further in the shape of a cone.

In addition, the structure 1 may be provided with only either light transmittance or light reflectivity.
In the light distribution control device of the third embodiment, it is preferable that the adjusting mechanism 2 shown in the second embodiment is provided so that the angle of each structure 1 can be changed.

Embodiment 4 FIG.
Furthermore, as shown in FIG. 10, it is possible to use a structure 1 having a curved cross section perpendicular to the longitudinal direction, and a plurality of the structures 1 can be arranged in parallel with each other at a predetermined interval. A protrusion U is formed on the curved surface in a direction perpendicular to the longitudinal direction. Since the structure 1 is curved, the diffusion is performed in the shape of a conical surface having a central axis as a line facing the tangential direction of the curve at the point where the incident light beam is incident. Therefore, conical surface-shaped diffusion having a central axis extending in a certain angle range rather than in one direction occurs, and a more uniform light distribution can be performed over a wide range.

Further, as shown in FIG. 11, a structure 1 having a rhombus or rectangular cross section perpendicular to the longitudinal direction is used, and a plurality of the structures 1 are arranged in parallel with each other at a predetermined interval. You can also. A protrusion U is formed on the surface of the structure 1 in a direction perpendicular to the longitudinal direction. In this case, the light incident on the surface 5 has a line parallel to the ridge U of the surface 5 and the central axis C5 due to the arrangement of the ridge U on the two surfaces 5 and 6 directed in the direction of light distribution. The light incident on the surface 6 is diffused in the shape of a cone having a line parallel to the ridge U of the surface 6 as the central axis C6. Accordingly, conical surface diffusion occurs in two directions, and a more uniform light distribution can be performed.
Note that the structure 1 shown in FIG. 10 and the structure 1 shown in FIG. 11 may have both light transmission and light reflection, or only one of light transmission and light reflection. It may be provided.

Embodiment 5. FIG.
FIG. 12 shows a light distribution control apparatus according to the fifth embodiment. This light distribution control device is arranged in the horizontal direction with a predetermined interval parallel to each other so that the surface of the structure 1 shown in the first embodiment, for example, faces the vertical direction above the region Q to be distributed. It is an arrangement. In addition, the protrusion U of each structure 1 has faced the perpendicular direction.
When sunlight or the like enters the surface of each structure 1 arranged in this manner from obliquely above, diffusion occurs in the shape of a cone having a center axis C as a line parallel to the ridge U and directed vertically downward, As a result, a uniform light distribution is made in the region Q located below.

As shown in FIG. 13, in the light distribution control device according to the fifth embodiment, the adjustment mechanism 2 shown in the second embodiment is provided so that the angle of each structure 1 can be changed. The light can be more reliably introduced into the region Q where light distribution is required.
Furthermore, as shown in FIG. 14, an array of a plurality of structures 1 can be formed in two layers vertically. In this case, it is preferable that the arrangement direction of the structures 1 located in the upper stage and the arrangement direction of the structures 1 located in the lower stage are crossed, for example, orthogonal. In this way, the light from the light source can be taken in more efficiently and distributed to the region Q.

Each structure 1 shown in FIGS. 12 and 14 does not necessarily have to be directed in the vertical direction, and may be arranged so that light from the light source can be incident at an angle with respect to the horizontal direction.
The structure 1 is not limited to that shown in the first embodiment, and a structure having a cross-sectional shape as shown in the third and fourth embodiments can also be used.

Example 1.
FIG. 15 shows a first embodiment in which the light distribution control device of the present invention is specifically implemented. The light distribution control device of the first embodiment is installed in the window 7 into which external light is inserted. The plurality of structures 1 of the light distribution control device are arranged along the surface of the window 7, and diffused light from the protrusions U of each structure 1 is taken into the room.

Example 2
As shown in FIG. 16, the light distribution control device of the first embodiment is installed in the skylight 8 into which external light is inserted. The plurality of structures 1 of the light distribution control device are arranged along the surface of the skylight 8, and diffused light from the protrusions U of each structure 1 is taken into the room from above.

Example 3
As shown in FIG. 17, the light distribution control device according to the first embodiment is installed above the shaded portion 10 of the building 9 and at a place where external light is inserted. The plurality of structures 1 of the light distribution control device are arranged in the horizontal direction above the portion 10, with each facing the vertical direction. Diffused light from the protrusion U of each structure 1 is taken from above toward the portion 10.

Example 4
As shown in FIG. 18, the light distribution control device of the first embodiment is installed above or to the side of the cultivated crop 11 in outdoor cultivation. Diffused light from the protrusions U of each structure 1 is taken from above toward the cultivated crop 11. Thereby, sunlight and artificial light can be effectively irradiated by the cultivated crop 11, and cultivation can be promoted.

Embodiment 5 FIG.
As shown in FIG. 19, the light distribution control device of the first embodiment is installed above the greenhouse 12 or on the roof. The plurality of structures 1 of the light distribution control device are arranged along the roof of the greenhouse 12 with each facing the vertical direction. Diffuse light from the protrusions U of each structure 1 is taken from above into the greenhouse 12.
As shown in FIG. 20, even if the light distribution control device of the first embodiment is installed in the upper part of the greenhouse 12, the same effect can be obtained.
The light distribution control device is not limited to the upper part of the greenhouse 12 or the upper part of the greenhouse 12, and may be installed in the vicinity of at least the ceiling part and the wall part of the greenhouse 12.

Example 6
As shown in FIG. 21, two transparent plates 13 and 14 each made of resin, glass, or the like are arranged in parallel with a distance from each other, and a large number of structures 1 are provided between the transparent plates 13 and 14. A light distribution panel 15 sandwiching the light distribution control device of the first embodiment was created, and as shown in FIG. 22, the ceiling part and the wall part of the greenhouse were formed by this light distribution panel 15. The diffused light from the protrusions U of each structure 1 in the light distribution panel 15 is taken from above and from the side toward the inside of the greenhouse.

In addition, since the light distribution control device is sandwiched between the transparent plates 13 and 14 having a double structure, a large number of structures 1 are protected from heat by a heat insulating effect.
It is not always necessary to form both the ceiling part and the wall part of the greenhouse with the light distribution panel 15, and it is effective to form at least one of the ceiling part and the wall part with the light distribution panel 15. is there.

  In addition to the first to sixth embodiments, it is also effective to install the light distribution control device of the present invention above or in front of the photosensitive portion of the solar cell, for example, and to perform efficient light distribution to the photosensitive portion.

It is a figure for demonstrating the light distribution control method which concerns on this invention. It is a fragmentary perspective view which shows the light distribution control apparatus which concerns on Embodiment 1 of this invention. FIG. 6 is a cross-sectional view illustrating the operation of the light distribution control device according to the first embodiment. It is sectional drawing which shows the various forms of the structure used for a light distribution control apparatus. It is an expanded sectional view which shows the protrusion of a structure. It is a side view which shows the light distribution control apparatus of Embodiment 2. FIG. 10 is a partial perspective view showing a structure used in the light distribution control device of Embodiment 3. FIG. 6 is a side view showing a light distribution control device in a third embodiment. FIG. 6 is a side view showing a light distribution control device in a third embodiment. FIG. 6 is a cross-sectional view showing a structure used in a light distribution control device of a fourth embodiment. FIG. 10 is a cross-sectional view showing a structure used in a modification of the light distribution control device in the fourth embodiment. FIG. 10 is a perspective view showing a light distribution control device in a fifth embodiment. FIG. 10 is a side view showing a modification of the light distribution control device in the fifth embodiment. FIG. 10 is a perspective view showing another modification of the light distribution control device in the fifth embodiment. It is a perspective view which shows the light distribution control apparatus of Example 1. FIG. It is sectional drawing which shows the light distribution control apparatus of Example 2. FIG. It is sectional drawing which shows the light distribution control apparatus of Example 3. FIG. It is sectional drawing which shows the light distribution control apparatus of Example 4. FIG. 10 is a cross-sectional view illustrating a light distribution control device according to a fifth embodiment. FIG. 10 is a cross-sectional view illustrating a light distribution control device according to a modification of the fifth embodiment. It is a fragmentary perspective view which shows the light distribution panel used for the greenhouse of Example 6. FIG. It is sectional drawing which shows the greenhouse of Example 6.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Structure, 2 Adjustment mechanism, 3 Outer part, 4 Inner part, 5,6 Surface, 7 Window, 8 Skylight, 9 Building, 10 part, 11 Cultivated crop, 12 Greenhouse, 13,14 Transparent board, 15 Light distribution Panel, U ridge, C, C1, C2, C5, C6 Central axis.

Claims (11)

A plate-like or film-like structure having at least light transmissivity or light reflectivity, and having a plurality of ridges arranged in parallel and sufficiently close to each other on at least one surface thereof, and the longitudinal direction of the ridges The cross-sections of the ridges perpendicular to the surface substantially form a part of a circle, and light is incident on a number of ridges of the structure whose surface is a substantially mirror surface,
A light distribution control method characterized by diffusing light in a conical or semi-conical shape with a line passing through the incident point and parallel to the ridge as a central axis. Each is a plate-like or film-like structure having at least light transmission or light reflection property, and has a plurality of ridges arranged in parallel and sufficiently close to each other on at least one surface thereof, and the length of the ridges. A plurality of structures in which the cross-sections of the ridges perpendicular to the direction form a part of a circle and the surfaces of the ridges are substantially mirror surfaces, the ridges are parallel to each other and the surfaces are parallel to each other. Are arranged so as to face each other at a predetermined interval in parallel,
It is characterized in that diffused light propagating in a conical or semi-conical shape centered on a line parallel to the ridge of light incident on the ridge of each structure is directed in the direction of light distribution Light distribution control device.   The light distribution control device according to claim 2, wherein a plurality of protrusions are formed on both surfaces of each structure.   4. The light distribution control device according to claim 2, wherein each structure has an elongated plate shape or a film shape, and a plurality of protrusions are formed along a direction intersecting with a longitudinal direction of each structure.   5. The light distribution control device according to claim 4, wherein each structure has a bent or V-shaped cross section perpendicular to the longitudinal direction.   The light distribution control device according to claim 2, further comprising an adjustment mechanism that changes an angle of each structure with respect to an arrangement direction of the plurality of structures.   7. The structure according to claim 2, wherein a plurality of structures are arranged along a window surface, and diffused light caused by the protrusions of each structure is taken into the room. The light distribution control device according to item.   Either of the Claims 2-6 installed in the location where external light is inserted above the part which becomes the shade of a building, and takes in the diffused light by the protrusion of each structure toward the part which becomes the shade of a building. The light distribution control device according to one item.   The light distribution control according to any one of claims 2 to 6, wherein the light distribution control is installed in at least one of the ceiling part and the wall part of the greenhouse or in the vicinity thereof, and takes in diffused light from the protrusions of each structure toward the inside of the greenhouse. apparatus.   A greenhouse in which the light distribution control device according to any one of claims 2 to 6 is installed in at least one of a ceiling portion and a wall portion or in the vicinity thereof.   The greenhouse according to claim 10, wherein at least one of the ceiling portion and the wall portion is formed by a light distribution panel in which the light distribution control device is sandwiched between transparent plates having a double structure.

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