JP2005240469A - Blind - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve problems that an existing blind needs to have a less tilt of a slat for seeing through the outside or taking in more natural light while it is necessary to have a greater tilt of the slat for shutting off a direct sunlight or blocking the direct sunlight coming into a room, for which the tilt of the slat has to be adjusted according to the height of the direct sunlight, an effect of reducing cooling load is not expected too much because the direct sunlight absorbed in the slat, becoming heat rays, comes into the room even the direct sunlight is shut off, and that, being composed of many slats, it is easy to catch dusts and hard to clean. <P>SOLUTION: The sheet-like blind, formed by connecting a plurality of minute rectangular prisms in vertical direction, reflects the direct sunlight back to the outside of the room utilizing total reflection and surface reflection, so that shading and blindfolding functions are achieved while the cooling load is reduced. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a blind that is attached to or hung inside a window glass in order to prevent direct sunlight from being shaded or peeping from outside.

A conventionally known blind is a slender plate-shaped light shielding plate called a slat that is hung up and down at equal intervals with a thin string, and is configured to block direct light by adjusting the inclination angle of the slat. Has been. A slat is generally an elongated plate made of metal or plastic, and the surface of the slat reflects and absorbs light to block it.
Patent Publication 10-339083 Patent Publication 07-301046

  Conventionally known blinds are used to see through the outside from between the slats, so in order to see through the outdoors and to incorporate more natural light, it is necessary to reduce the inclination of the slats, but direct light In order to block or prevent the reflected light from entering the room, it is necessary to increase the inclination of the slats. For this purpose, it is necessary to adjust the inclination of the slats according to the altitude of direct light. Moreover, even if the direct light was blocked, the direct light absorbed by the slats entered the room as heat rays, so the effect of reducing the cooling load could not be expected so much. Furthermore, since it is composed of a large number of slats, there is a drawback that dust is easily attached and cleaning is difficult.

  The blind according to the present invention is a sheet-like blind formed by connecting a plurality of small quadrangular prisms in the vertical direction, and reversely emits direct light to the outdoor side using total reflection and surface reflection. It serves as a blindfold and reduces the cooling load.

  The blind according to the present invention can significantly reduce the cooling load as compared with a conventionally known blind. Moreover, it is not necessary to adjust according to the altitude of direct light. Furthermore, since the surface of the blind can be flattened, there is an advantage that it is difficult to get dirty and easy to clean.

  The blind according to the present invention is a method of reversing the traveling direction of light using the total reflection of light caused by the difference in the refractive index of the transmitting medium in addition to the surface reflection on the surface of the material. A transparent material having a large refractive index with respect to air and a high transmittance is desirable, and generally an acrylic resin or the like is suitable.

  FIG. 1 is a sectional view of a blind 1 according to the present invention. Reference numeral 2 denotes a quadrilateral prism made of a transparent material, and a plurality of prisms are connected in the vertical direction to form a sheet-like blind 1. 3 is a light incident surface facing the indoor / outdoor direction, 4 is a light transmission surface parallel to the incident surface 3, and 5 and 6 are an upper reflection surface and a lower reflection surface facing in the vertical direction. 4, the upper reflection surface 5 and the lower reflection surface 6 constitute the prism 2. In addition, a surface reflecting film (not shown) for reflecting the light beam on the surface like a mirror is attached to the upper reflecting surface 5 and the lower reflecting surface 6 by metal deposition or pigment application. is there.

  It is desirable that the surface reflection film is a material having high reflectivity and close to specular reflection. A filler 7 is filled in a groove between the upper reflecting surface 5 and the lower reflecting surface 6 and is filled for the purpose of protecting the surface reflecting film and flattening the indoor side of the blind. The filler 7 may be a method of covering the entire surface on the transmission surface 4 side using a transparent material, or a method of filling only the grooves with an opaque material having a high reflectance and also serving as a surface reflection film. Reference numeral 8 denotes a connection allowance for connecting adjacent prisms. Since the coupling allowance 8 is not related to light refraction or reflection, it is desirable that the coupling allowance 8 be as thin as possible in order to save material.

  Arrows a to h indicate the path of the light beam, and a indicates direct light close to noon with a high altitude, and the direction is changed while repeating surface reflection on the upper reflecting surface 5 and the lower reflecting surface 6. Inverted and emitted as indicated by arrow b. Light rays that enter the same path in the opposite direction from the arrow b are bounced back in the direction of the arrow a. In the case of the light beam of the arrow c and the light beam of the arrow e having a lower altitude, after the surface reflection is repeated on the upper reflection surface 5 and the lower reflection surface 6, the direction is reversed by total reflection on the transmission surface 4, and the arrows d and f It is released by the route. Further, in the case of light rays g and h having a low altitude, the light passes through the transmission surface 4 without hitting the upper reflection surface 5 or the lower reflection surface 6. In other words, indoors and outdoors can be seen through each other in this range. The angle of the boundary between blocking and transmitting can be set from the inclination of the upper reflecting surface 5 and the lower reflecting surface 6 and the reflectance of the constituent material. The inclination angle of the lower reflecting surface 6 is determined by the light rays from the incident surface 3. What is necessary is just to set to the angle which totally reflects in the transmissive surface 4. FIG. The upper reflective surface 5 may be slightly inclined to facilitate molding, but the area of the transmissive surface 4 that can be seen through is reduced accordingly.

  The surface reflection in the present invention refers to a phenomenon in which light rays are reflected on the surface of a substance. Like a general-purpose glass mirror, light rays that have traveled in a transparent glass are reflected on the surface of a metal film deposited on the back surface of the glass. Includes reflective state. The total reflection refers to a phenomenon in which a light beam that attempts to enter a boundary surface between different transparent materials (for example, air and water) beyond a critical angle reverses the traveling direction.

  As described above, the blind 1 according to the present invention reversely emits direct light outdoors due to total reflection on the transmission surface 4 and surface reflection on the upper reflection surface 5 and the lower reflection surface 6. It can be greatly reduced. In addition, it is not necessary to adjust to the altitude of the sun unlike conventional blinds, and since the blinds are flat, it is difficult to get dust and easy to clean even if attached. It has advantages.

  By installing it in the windows of buildings and houses, the cooling load caused by direct light can be greatly reduced, and indoor peeping can be prevented. Moreover, since it is a flat sheet shape, it is useful for providing a comfortable living environment that is inconspicuous.

1 is a cross-sectional view of a blind according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Blind 2 Prism 3 Incident surface 4 Transmission surface 5 Upper reflection surface 6 Lower reflection surface 7 Filler 8 Connection allowance ah Light path

Claims (2)

  A plurality of quadrilateral prisms made of a transparent material surrounded by a light incident surface facing indoors and outdoors, a light transmission surface parallel to the incident surface, and an upper reflective surface and a lower reflective surface facing vertically Is a sheet-like blind formed by connecting vertically, and has a surface reflecting film for reflecting the surface of the light beam on the upper reflection surface and the lower reflection surface, and the light beam incident over a predetermined angle, A blind characterized in that it is configured to be inverted and emitted from the incident surface by surface reflection on the upper reflection surface and lower reflection surface and total reflection on the transmission surface.   2. The blind according to claim 1, wherein a material for filling the groove is filled in the groove between the upper reflecting surface and the lower reflecting surface of the prism.

Images