Solar radiation shielding structure

Abstract

To provide a solar radiation shielding structure capable of reducing visibility from the outdoors into a room at night.SOLUTION: A solar radiation shielding structure, which is configured to block sunlight entering a room through an opening of a building, includes a perforated shading plate (2) that is arranged to cover at least a part of the opening and has a plurality of through holes (2h) penetrating in an inward / outward direction. The perforated shading plate (2) has an inclined surface (231), located directly above the through holes, that faces diagonally downward to receive irradiated light from below outdoors.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a solar radiation shielding structure, and particularly to a solar radiation shielding structure for shielding solar radiation entering a room from an opening of a building.

Background Art

[0002] In the architectural plan of a building (for example, a house) having an opening (window), it is often desired to achieve both the outdoor viewability from the opening and the suppression of glare caused by solar radiation. It is common to combine solar radiation shielding objects such as eaves and louvers. In addition to this, there are known methods for achieving both using perforated light-shielding plates and net-like materials.

[0003] The perforated light-shielding plate has a large number of small-diameter through-holes. However, if the diameter of the through-holes is too small, the viewability for seeing the outdoor scenery is impaired. On the other hand, if the diameter of the through-holes is made too large in order to enhance the viewability, the solar radiation shielding effect is consequently impaired, which is not desirable. To address such problems, Japanese Patent Application Laid-Open No. 2023-49345 (Patent Document 1) proposes a solar radiation shielding device in which two light-shielding plates having different through-hole sizes are arranged in a state of facing each other in the inner and outer directions.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] As shown enlarged in FIG. 8, a general perforated light-shielding plate is formed of a flat thin plate having a plurality (a large number) of through-holes 2h penetrating in the plate thickness direction. If the diameter of the through-holes 2h of a general perforated light-shielding plate 200 is reduced, the solar radiation shielding effect can be improved. However, as described above, the viewability from the room is impaired.

[0006] It is known that by utilizing the visual effect of a person and making the indoor surface (the surface on the indoor side) of a perforated light-shielding plate dark, the diameter of the through-holes can be reduced while enhancing the viewability during the day (the perspective from the indoor to the outdoor). However, such a perforated light-shielding plate also increases the perspective from the outdoor to the indoor. In particular, when the indoor lighting is turned on at night, a phenomenon occurs where the interior becomes prominent due to the luminance ratio between the brightness of the interior and the dark indoor surface of the perforated light-shielding plate.

[0007] The solar radiation shielding device of Patent Document 1 realizes an improvement in the solar radiation shielding effect and viewability by using two light-shielding plates with different through-hole sizes, but does not consider the perspective at night. Therefore, a technology that can reduce the perspective at night in addition to improving the solar radiation shielding effect and viewability has been desired.

[0008] The present invention has been made to solve the above problems, and its object is to provide a solar radiation shielding structure capable of reducing the perspective from the outdoor to the indoor at night.

Means for Solving the Problems

[0009] A solar radiation shielding structure according to an aspect of the present invention is a solar radiation shielding structure that shields solar radiation light incident from an opening of a building into the interior, and includes a perforated light-shielding plate that is arranged to cover at least a part of the opening and is provided with a plurality of through-holes penetrating in the inner and outer directions. The perforated light-shielding plate has an inclined surface facing obliquely downward that receives irradiation light from below the outdoor above the through-holes.

[0010] Preferably, the solar radiation shielding structure further includes a lighting device that is arranged on the outdoor side of the perforated light-shielding plate and irradiates the inclined surface from below at night.

[0011] It is desirable that the lighting device has a light source that directs the inclined surface within the height range of the line of sight of a person inside the room.

[0012] The perforated light-shielding plate has a corrugated shape in which mountain portions and valley portions extending in the vertical direction are repeatedly provided along the width direction, and is composed of a lath plate in which a plurality of through holes are provided in a staggered manner through the mountain portions.

[0013] Preferably, the color of the outdoor surface of the perforated light-shielding plate is lighter than the color of the indoor surface.

Advantages of the Invention

[0014] According to the present invention, the perspective from the outside to the inside at night can be reduced.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0016] Embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and their descriptions will not be repeated.

[0017] (Overview of the Solar Radiation Shielding Structure) Referring to FIG. 1, the outline of the solar radiation shielding structure 1 according to the present embodiment will be described. FIG. 1 is a diagram schematically showing the outline of the solar radiation shielding structure 1 according to the present embodiment. Arrow A1 in FIG. 1 indicates the outdoor direction as viewed from the indoor space S1 which is the interior of the building, and arrow A2 indicates the vertical direction.

[0018] The solar radiation shielding structure 1 shields the solar radiation entering the indoor space S1 from the opening 10 of the building. The opening 10 is typically an opening for a window (not shown) provided in the outer wall 11 of the building, and communicates with the indoor space S1 and the outdoor space S2. The depth direction of the opening 10 is also referred to as the inside-outside direction. The solar radiation shielding structure 1 includes a perforated light-shielding plate 2 disposed so as to cover at least a part of the opening 10, and a lighting device 5 disposed on the outdoor side of the perforated light-shielding plate 2.

[0019] In the present embodiment, the perforated light-shielding plate 2 is disposed on the outdoor side of the opening 10 and is attached so as to cover the entire opening 10. The perforated light-shielding plate 2 is installed in a substantially vertical state with reference to a virtual plane B parallel to the outer wall 11. The virtual plane (hereinafter referred to as "virtual reference plane") B is assumed to pass through the central position in the plate thickness direction of the perforated light-shielding plate 2. The perforated light-shielding plate 2 has a front surface (outdoor surface) 20a facing the outdoor side and a back surface (indoor surface) 20b facing the indoor side. The perforated light-shielding plate 2 is attached to the outer wall 11 via a fixture 4 such as a bracket. The perforated light-shielding plate 2 has a plurality (a large number) of through holes (not shown in FIG. 1) penetrating in the inside-outside direction. Therefore, the solar radiation shielding structure 1 can block solar radiation at the surface 20a of the perforated light-shielding plate 2 (the portion without through holes) and ensure the view from the indoor space S1.

[0020] The lighting device 5 is installed at a position below the opening 10 in the outdoor space S2 and irradiates the perforated light-shielding plate 2 obliquely from below. It is desirable that the lighting device 5 has a light source 50 linearly extending along the width direction of the outer wall 11, that is, the width direction of the perforated light-shielding plate 2 (the depth direction in the drawing).

[0021] (Regarding the perforated light-shielding plate) Referring to FIGS. 2 to 5, the perforated light-shielding plate 2 in the present embodiment will be described. FIGS. 2 and 3 are diagrams schematically showing the planar shape of the perforated light-shielding plate 2. FIG. 2 is an enlarged front view of the perforated light-shielding plate 2 as seen from the outdoor space S2 (from the II direction in FIG. 1), and FIG. 3 is an enlarged rear view of the perforated light-shielding plate 2 as seen from the indoor space S1 (from the III direction in FIG. 1). FIG. 4 is an enlarged longitudinal sectional view of the perforated light-shielding plate 2, corresponding to a section along the line IV-IV in FIG. 2. FIG. 5 is an enlarged cross-sectional view of the perforated light-shielding plate 2, corresponding to a section along the line V-V in FIG. 2. In FIG. 2 and the like, the width direction (horizontal direction) of the perforated light-shielding plate 2 is indicated by an arrow A3.

[0022] As shown in FIGS. 2 and 3, the perforated light-shielding plate 2 is composed of a lath plate in which substantially rhombic through-holes 2h are provided in a staggered pattern. That is, the perforated light-shielding plate 2 has, for example, a three-dimensional shape in which a thin metal plate is alternately cut in the width direction and the cuts are widened in the vertical direction. The cuts constitute the through-holes 2h. Note that the material of the perforated light-shielding plate 2 is not limited to metal.

[0023] In the perforated light-shielding plate 2 in the present embodiment, vertical (up-and-down direction) folds are made in the thin plate, and cuts are made in the folded portions to form the through-holes 2h. Therefore, as shown in FIGS. 2, 3, and 5, the lath plate constituting the perforated light-shielding plate 2 has a corrugated shape in which ridges 21 and valleys 22 extending in the vertical direction (longitudinal direction) are repeatedly provided along the width direction, and the through-holes 2h are provided such that the top portions of the ridges 21 are at the center in the width direction. In these figures, a line C (hereinafter referred to as the "center line") passing through the top portions of the ridges 21 (corresponding to the folds) is indicated by a dashed line. As shown in FIGS. 4 and 5, at least a part of the ridge 21 protrudes to the outdoor side from the virtual reference plane B. The valley 22 is a part that at least partially protrudes to the indoor side from the virtual reference plane B. In FIGS. 2 and 3, for the sake of convenience, the concave shape of the valley 22 is shown with omission.

[0024] As shown in FIGS. 2 and 3, the through-hole 2h has a substantially rhombic shape and is an opening that penetrates at least the peak portion 21. A plurality of through-holes 2h are provided in a staggered pattern penetrating the peak portion 21. The through-hole 2h may be provided across the region of the valley portion 22. Each peak portion 21 has a plurality (a large number) of convex portions 23 at a constant pitch with the through-hole 2h interposed therebetween along the vertical direction. The convex portion 23 is the portion that protrudes (most) to the outdoor side from the virtual reference plane B. Focusing on one through-hole 2h, the four corner portions of the through-hole 2h are formed by the upper convex portion 23a, the lower convex portion 23b, the left convex portion 23c, and the right convex portion 23d. The through-hole 2h is surrounded by a plate portion having a substantially rhombic frame shape with irregularities, including the upper convex portion 23a, the lower convex portion 23b, the left convex portion 23c, and the right convex portion 23d.

[0025] It is desirable that the color of the back surface 20b of the perforated light shielding plate 2 shown in FIG. 3 is a dark color (such as black, gray, brown, etc.). By making the back surface 20b dark in this way, even if the through-hole 2h is made smaller, the viewability from the indoor space S1 can be ensured. Specifically, even if the arrangement pitch P of the through-holes 2h in the vertical direction is 20 mm or less, the viewability from the indoor space S1 can be ensured due to the visual effect (compared with the case where the back surface 20b is a light color). It is desirable that both the vertical dimension L1 and the horizontal dimension L2 of the through-hole 2h are 5 mm or more and 15 mm or less, and desirably about 10 mm as an example. In the present embodiment, the horizontal dimension L2 corresponds to the maximum diameter (maximum length) of the through-hole 2h.

[0026] It is desirable that the color of the front surface 20a of the perforated light shielding plate 2 shown in FIG. 2 is a light color (such as white, silver, etc.). That is, it is desirable that the color of the front surface 20b is lighter than the color of the back surface 20b. Thereby, the transparency from the outdoor space S1 during the day can be reduced.

[0027] Here, as shown in FIG. 4, each convex portion 23 is adjusted in posture so as to be able to reflect the irradiation light from the lighting device 5. Specifically, the perforated light shielding plate 2 is processed such that the surface (outdoor surface) 231 of each convex portion 23 becomes an inclined surface that is obliquely downward when viewed from the outdoor side. As a result, each through hole 2h is formed between the obliquely downward surface 231 of the upper convex portion 23a and the obliquely upward back surface 232 of the lower convex portion 23b, and thus opens obliquely upward when viewed from the indoor space S1.

[0028] The surface (outdoor surface) 231 of the convex portion 23 is inclined at a predetermined angle θ1 with respect to a virtual reference plane B that is a vertical plane. Although the angle θ is assumed to be about 45 degrees, it may be arbitrarily determined within the range of 30 degrees to 60 degrees.

[0029] The surface 20a of the perforated light shielding plate 2 includes a plurality of surfaces 231 that are obliquely downward inclined surfaces. As will be described later, at least a part of these surfaces 231 receives the irradiation light from below outdoors, so that the luminance of the surface 20a of the perforated light shielding plate 2 can be efficiently increased. Thereby, the problem that the transparency from the outdoor space S2 becomes higher than that during the day (due to the luminance ratio between the brightness of the indoor space S1 and the back surface 20b of the perforated light shielding plate 2) at night can be solved.

[0030] (Regarding the lighting device) With reference to FIGS. 1 and 6, the lighting device 5 will be described. FIG. 6 is a longitudinal sectional view schematically showing the positional relationship between the lighting device 5 and the perforated light shielding plate 2.

[0031] The light source 50 of the lighting device 5 is typically composed of an LED (Light Emitting Diode). The light source 50 is desirably a highly directional light source that emits light in a specific direction. The lighting device 5 is installed on the outdoor side of the perforated light shielding plate 2 and near the installation position of the perforated light shielding plate 2 (the distance between the perforated light shielding plate 2 and the lighting device 5 is short in the indoor-outdoor direction of the building). The lighting device 5 is installed, for example, on the ground of the outdoor space S2 and irradiates a predetermined position (height) of the perforated light shielding plate 2 from obliquely below.

[0032] The light source 50 of the lighting device 5 is attached so as to direct at the surface (inclined surface) 231 of the convex portion 23 within the eye height range of a person in the indoor space S1. The eye height range of a person is approximately in the range of 1400 to 1700 mm from the floor level FL of the indoor space S1. In the present embodiment, the light source 50 is attached so as to direct at the surface 231 (hereinafter referred to as "target inclined surface 231") of the convex portion 23 at a height of about 1500 mm from the floor level FL of the indoor space S1.

[0033] Also, as shown in FIG. 6, it is desirable that the light source 50 be attached at a position where the reflected light of the light source 50 on the target inclined surface 231 is downward from the horizontal. Specifically, it is desirable that the irradiation angle θ2 of the light source 50 with respect to the target inclined surface 231 be less than 90 degrees, and the irradiation angle θ3 of the light source 50 with respect to the virtual reference plane B be less than 45 degrees. Thereby, the surface 231 of the convex portion 23 within the eye height range of a person can be effectively illuminated.

[0034] The lighting device 5 is controlled to be lit at night. The ON / OFF of the lighting device 5 may be automatically performed by a timer or manually by a resident of the building.

[0035] (Function and effect) The function and effect of the solar radiation shielding structure 1 according to the present embodiment will be described.

[0036] The solar radiation shielding structure 1 includes a lattice-shaped perforated light-shielding plate 2 attached so as to cover the opening 10 of the building, and a lighting device 5 that irradiates the perforated light-shielding plate 2 from the outdoor side. The lighting device 5 is powered on at night, and the surface 20a of the perforated light-shielding plate 2 is illuminated obliquely downward by the light source 50. Specifically, it is illuminated aiming at the surface (target inclined surface) 231 of the convex portion 23 at a height of about 1500 mm from the floor level FL of the indoor space S1. As a result, the target inclined surface 231 and the surfaces 231 in the vicinity (especially the lower side) thereof become highly bright due to the light from below, so that the transparency from the outdoor space S2 can be reduced even with a small irradiation amount. Further, since the irradiation light and the reflected light of the light source 50 hardly reach the indoor space S1, the occupants can comfortably spend time (without feeling dazzled) in the indoor space S1.

[0037] Therefore, according to the solar radiation shielding structure 1 according to the present embodiment, it is possible to reduce the nighttime transparency while maintaining the solar radiation shielding effect and the viewability. Further, the perforated light-shielding plate 2 in the present embodiment is not a flat plate, but has irregularities in both the vertical direction and the width direction, so that the design can be improved. Therefore, the perforated light-shielding plate 2 can be suitably used for the facade of the building.

[0038] (Other shape examples of the perforated light-shielding plate) Although the perforated light-shielding plate 2 in the present embodiment is shown as an example constituted by a lattice plate having substantially rhombus-shaped through holes 2h arranged in a staggered pattern, it is not limited to such an example. The perforated light-shielding plate only needs to have an inclined surface facing obliquely downward that receives the irradiation light from the outdoor lower side directly above the through hole 2h.

[0039] The perforated light-shielding plate may have a shape as shown in FIG. 7, for example. FIG. 7(A) is an enlarged front view of the perforated light-shielding plate 2A, and (B) is a longitudinal sectional view of the perforated light-shielding plate 2A. The perforated light-shielding plate 2A has a corrugated (bellows-shaped) form in which mountain portions 24 and valley portions 25 extending in the lateral direction are repeatedly provided along the width direction, and the through holes 2h are provided so as to penetrate the valley portions 25. At least a part of the mountain portion 24 protrudes to the outdoor side with respect to the virtual reference plane B. The valley portion 25 is a portion where at least a part protrudes to the indoor side with respect to the virtual reference plane B. The through holes 2h are, for example, round holes. The plurality of through holes 2h are arranged in a matrix (or staggered) pattern. In this case, the inclined surface 241 of the mountain portion 24 located directly above the through hole 2h constitutes an inclined surface facing obliquely downward that receives the irradiation light from below the outdoor side.

[0040] (Modification example) In the present embodiment, an example in which the perforated light-shielding plate 2 is arranged on the outdoor side of the opening 10 has been shown, but it may be arranged on the indoor side of the opening 10, that is, in the indoor space S1. In this case, it is also desirable that the lighting device 5 is arranged on the indoor space S1 side with respect to the window (not shown).

[0041] Alternatively, in a form in which a double skin (double window) is provided in the opening 10, the perforated light-shielding plate 2 and the lighting device 5 may be provided inside the double skin.

[0042] In addition, although the opening 10 to which the solar radiation shielding structure 1 is applied is an opening for a window, it is not limited to the opening for a window as long as it is an opening through which solar radiation enters.

[0043] It should be considered that the embodiments disclosed this time are illustrative in all respects and not restrictive. The scope of the present invention is shown not by the above description but by the claims, and it is intended that all modifications within the meaning and scope equivalent to the claims are included.

Explanation of reference numerals

[0044] 1 Solar shading structure, 2, 2A perforated light-shielding plate, 2h through-hole, 5 lighting device, 10 opening, 11 outer wall, 20a, 20b, 231 surface, 20b, 232 back surface, 21, 24 ridge portion, 22, 25 valley portion, 23 convex portion, 50 light source, B virtual reference plane, S1 indoor space, S2 outdoor space.

Claims

1. A solar radiation shielding structure for shielding solar radiation entering a room from an opening of a building, comprising a perforated light shielding plate disposed so as to cover at least a part of the opening and provided with a plurality of through holes penetrating in the inner and outer directions, wherein the perforated light shielding plate has an inclined surface facing obliquely downward for receiving irradiation light from below outdoors directly above the through hole, the solar radiation shielding structure.

2. The solar radiation shielding structure according to claim 1, further comprising a lighting device disposed on the outdoor side of the perforated light shielding plate and irradiating the inclined surface from below at night.

3. The solar radiation shielding structure according to claim 2, wherein the lighting device has a light source directed at the inclined surface within the range of the eye level height of a person indoors.

4. The perforated light shielding plate has a corrugated shape in which ridges and valleys extending in the vertical direction are repeatedly provided along the width direction, and the plurality of through holes are formed by a lath plate provided in a staggered manner through the ridges, the solar radiation shielding structure according to any one of claims 1 to 3.

5. The solar radiation shielding structure according to any one of claims 1 to 4, wherein the color of the outdoor surface of the perforated light shielding plate is lighter than the color of the indoor surface.

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