JP6750200B2 - Light control sheet and curtain including the same - Google Patents

Description

The present invention relates to a light control sheet for controlling outside light such as sunlight that is incident on the inside of a building and the like, and a curtain including the light control sheet.

Related to this type of technology is, for example, a roll curtain installed so as to cover a window of a building or the like. A general roll curtain is usually made of a fabric such as polyester.

There are various types of such general roll curtains according to the use, and the cloth is selected according to the use. For example, a thick fabric is used in a type that emphasizes privacy, and a fabric such as lace is used in a type that emphasizes interior design (design). A roll curtain produced from such a fabric can be given various colors and designs depending on the selection of the fabric, and thus can be said to be generally excellent in designability.

On the other hand, various roll curtains have been proposed with emphasis on functionality. For example, Patent Documents 1 and 2 and the like disclose roll curtains including a deflection layer that deflects incident light in a desired direction and emits the same in order to obtain a daylighting effect on the indoor side.

JP, 2013-155569, A JP2012-224975A

By the way, in many cases, the deflecting layer having the functionality disclosed in the above-mentioned Patent Documents 1 and 2 is formed of a resin, which may cause a glare or glare. Such glare and glare deteriorate the design of the roll curtain. Therefore, in such a roll curtain, it is desired that excellent designability can be ensured while sufficiently exhibiting an original function of daylighting performance.

As a method of suppressing the glare and glare, it is conceivable to provide a sheet-shaped member so as to cover the deflection layer. However, the mere provision of the member on the deflecting layer may not bring out the sufficient lighting performance. Further, if the material of the member is hard or the like, the transportability of the roll curtain may be impaired, and the handling may not be good.

The present invention has been made in consideration of such a point, and can exhibit suitable lighting performance, can secure excellent designability, and a light control sheet excellent in handleability and the same. The purpose is to provide a curtain provided with.

The present invention includes a deflecting layer having an incident surface and an emitting surface facing each other, deflecting light incident from the incident surface and emitting the light from the emitting surface, and a cloth laminated with the deflecting layer. A light control sheet, wherein the deflection layer has a plurality of light-transmissive projections, and a void formed between the projections. Is.

In the light control sheet, the total light transmittance of the cloth is preferably 40% or more and 80% or less.

In the light control sheet, the cloth may contain any one of vegetable fiber, animal fiber, and chemical fiber, or at least two kinds of them.

Further, the present invention is a curtain including the above-mentioned light control sheet.

The curtain may include a shaft member, the light control sheet may have one end attached to the shaft member, and may be configured to be wound around and unfoldable on the shaft member.

Further, in the curtain, a weight member may be provided at the other end of the light control sheet.

Further, in the curtain, the outer diameter dimension of the shaft member may be 25 mm to 120 mm.

Advantageous Effects of Invention According to the present invention, it is possible to provide a light control sheet capable of exhibiting favorable lighting performance, ensuring excellent designability, and excellent in handleability, and a curtain including the light control sheet.

1 is a perspective view of a curtain including a light control sheet according to an embodiment of the present invention. It is a partial cross section figure in the up-down direction of the curtain of FIG. It is a fragmentary sectional view of the light control sheet explaining the modification 1 of the light control sheet concerning this embodiment. It is a fragmentary sectional view of the light control sheet explaining the modification 2 of the light control sheet concerning this embodiment. It is a fragmentary sectional view of the light control sheet explaining the modification 3 of the light control sheet concerning this embodiment. It is a fragmentary sectional view of the light control sheet explaining the modification 4 of the light control sheet concerning this embodiment. It is a fragmentary sectional view of a light control sheet explaining the modification 5 of the light control sheet concerning this embodiment. It is a schematic diagram of a projection transmittance measuring device for obtaining such projection transmittance of this embodiment. It is a schematic diagram of the 1st evaluation device for evaluating the lighting effect. It is a schematic diagram of the 2nd evaluation device for evaluating the lighting effect. 5 is a diagram showing a graph showing the relationship between the total light transmittance and the lighting effect according to Example 1. FIG.

An embodiment of the present invention will be described below with reference to the drawings. In one embodiment described below, an example in which the light control sheet is applied to a curtain, particularly a roll curtain that can be wound up is shown.

In addition, in the drawings attached to the present specification, for convenience of illustration and understanding, the scales, vertical and horizontal dimensional ratios, etc. are appropriately changed and exaggerated.

Further, in the present specification, the terms “sheet”, “film”, and “plate” are not distinguished from each other based only on the difference in designation. For example, “sheet” is a concept that includes members that can be called films and plates.

Further, as used in the present specification, for specifying the shape and geometric conditions and their degree, for example, terms such as "parallel", "orthogonal", "identical", etc., without being bound to a strict meaning, The same function should be interpreted in a range that can be expected.

Further, the "sheet surface (film surface, plate surface)" means the target sheet-shaped member (film-shaped member) when the target sheet-shaped (film-shaped, plate-shaped) member is viewed as a whole and in a general view. , Plate-like member).

(Curtain composition)
1 is a perspective view of a roll curtain 1 according to an embodiment of the present invention, and FIG. 2 is a partial cross-sectional view of the roll curtain 1 in the vertical direction of FIG. The roll curtain 1 is a daylighting tool that is arranged and used so as to hang down inside a window, for example. Hereinafter, the roll curtain 1 will be simply referred to as the curtain 1.

As shown in FIG. 1 and FIG. 2, the curtain 1 according to the present embodiment has a daylighting sheet 2 arranged on the side on which light is incident, and a sheet laminated and arranged on the emission surface side of the daylighting sheet 2. The light control sheet 4 including the strip-shaped cloth 3 is provided. A roll mechanism 21 for winding the light control sheet 4 is provided above the curtain 1, and a chain 22 for adjusting the winding amount of the light control sheet 4 is provided at one end of the roll mechanism 21. Is attached. Both ends of the chain 22 are connected to the roll mechanism 21, and the chain 22 hangs down from the roll mechanism 21 in a U shape.

The roll mechanism 21 has a shaft member 21A and a frame member 21B that rotatably supports both ends of the shaft member 21A, and one end of the light control sheet 4 is attached to the shaft member 21A. The frame member 21B is a member that is fixed to the upper edge portion of the window of the building and supports the shaft member 21A and the light control sheet 4. Further, a shaft-shaped weight member 21C extending parallel to the shaft member 21A is provided at the other end of the light control sheet. The weight member 21C applies a load so that the light control sheet 4 extends straight in the vertical direction when the light control sheet 4 hangs down from the shaft member 21A. The outer diameter of the shaft member 21A is generally set to 25 mm to 120 mm.

In the curtain 1, when one of the chains 22 is lowered while the chain 22 is hanging down, the winding amount of the light control sheet 4 is reduced so that the light control sheet 4 is pulled out further downward. Has become. Further, when the other hanging part of the chain 22 is lowered, the winding amount of the light control sheet 4 is increased, and the light control sheet 4 is moved upward. That is, the light control sheet 4 is configured to be wound around the shaft member 21A and unfoldable.

(Structure of light control sheet)
FIG. 2 shows the cross sections of the daylighting sheet 2 and the cloth 3 in the light control sheet 4, respectively. As shown in FIG. 2, the daylighting sheet 2 in the present embodiment has a base material layer 6 having main surfaces facing each other, and a deflection layer 7 laminated on one main surface of the base material layer 6. ing. The base material layer 6 is a sheet-shaped layer that supports the deflection layer 7 and has a light-transmitting property. On the other hand, the deflection layer 7 is a layer that has an incident surface 7a and an emission surface 7b facing each other, and deflects the light incident from the incident surface 7a at the interface between the protrusion 12 and the void portion 11 to be emitted from the emission surface 7b. is there. In addition, in the daylighting sheet 2, a protective layer may be provided in addition to the base material layer 6 and the deflection layer 7. Further, a heat ray cutting layer, an ultraviolet ray cutting layer, or the like may be provided. Further, in the daylighting sheet 2, the base material layer 6 may be omitted.

In the illustrated example, the deflection layer 7 has a plurality of protrusions 12 that are arranged apart from each other along the incident surface 7a, and a void 11 formed between the protrusions. For the protrusion, for example, an optical element such as an optical prism body containing resin or glass as a main component can be used. Further, the void portion 11 can be filled with air, gas, or the like. The larger the difference in refractive index, the more external light that can be totally reflected at the interface between the protrusion 12 and the void 11, which is preferable. For example, when air having a refractive index of 1.0 is present in the void, a sufficiently large difference in refractive index can be obtained in relation to the refractive index of the protrusion having resin or glass as a main component.

The protrusion 12 has a first surface 12a and a second surface 12b extending in a direction intersecting with the incident surface 7a. The protrusion 12 changes the traveling direction of light based on the refractive index difference between the void 11 and the protrusion 12 at least in the second surface 12b of the interface with the void 11. FIG. 2 shows an example of an asymmetric structure in which all the projections 12 shown have a first surface 12a and a second surface 12b having different shapes, but the first surface 12a and the second surface 12b have the same shape. It may have a symmetrical structure.

As shown by the arrow in FIG. 2, the deflecting layer 7 in the present embodiment as described above is configured to deflect the light incident from the incident surface 7a so that the light is deflected upward obliquely and emitted from the emitting surface 7b. ing. If the incident light can be bounced up in this way, the cross-sectional structure of the daylighting sheet 2 does not necessarily have to have the configuration shown in FIG. 2, and for example, as shown in FIGS. Alternatively, the configuration may be as follows.

Further, as shown in FIG. 2, the cloth 3 in the present embodiment is provided to ensure the design of the light control sheet 4. This cloth 3 has translucency. This is because the lighting effect of the lighting sheet 2 is lost when no light is transmitted. In the present embodiment, such a cloth 3 is laminated on the emission surface 7b of the deflection layer 7. At this time, an adhesive layer may be provided between the cloth 3 and the emission surface 7b of the deflection layer 7. In this case, the adhesive layer is made of a thermoplastic resin or the like and has a light-transmitting property. It is preferable that the cloth 3 is provided so as to cover the entire surface of the deflection layer 7 from the viewpoint of making the glare and glare caused by the deflection layer 7 inconspicuous, or more sensitive to the glare and glare. It is preferable that the single cloth 3 is provided in a region where it is easy to perform, for example, in a central region excluding the periphery of the deflection layer 7.

Note that, in the example shown in FIG. 2, the respective elements are laminated in the order of the base layer 6, the deflection layer 7, and the cloth 3 from the side where the light is incident to the side where the light is emitted. However, the light control sheet 4 or the curtain 1 is formed by laminating the respective components of the deflection layer 7, the base material layer 6, and the cloth 3 in this order from the light incident side to the light emitting side. May be. Further, the cloth 3, the deflection layer 7, the base material layer 6, or the cloth 3, the base material layer 6, and the deflection layer 7 may be arranged in this order from the side on which the light is incident.

The cloth 3 in the present embodiment is a sheet using fibers. The material of the cloth 3 is not particularly limited. For example, as the cloth 3, a woven fabric, a knitted fabric, a lace, a felt, or a non-woven fabric containing any one of vegetable fiber, animal fiber, and chemical fiber, or at least two of them can be used.

The vegetable fiber is cotton, hemp and the like, and the animal fiber is silk, wool, alpaca, angora, cashmere, mohair and the like. Further, the chemical fiber is a recycled fiber, a semi-synthetic fiber, a synthetic fiber, an inorganic fiber or the like. Examples of the recycled fiber include fibrous materials such as rayon, cupra, and polynosic. Further, as the semi-synthetic fiber, fibrous substances such as acetate, triacetate, promix and the like can be exemplified. Examples of synthetic fibers include nylon, polyester, acrylic, polyvinyl chloride, polyurethane, and other fibrous materials. Further, examples of the inorganic fiber include fibrous materials such as glass and metal.

As described above, the cloth 3 can be selected from various materials. Among them, polyester, acrylic, rayon, cotton, hemp and silk are preferable, and polyester, cotton and hemp are particularly preferable. The reason why polyester, acrylic, rayon, cotton, hemp, and silk are preferable is that they are easily available and the cost can be suppressed because they are widely distributed as general curtain fabrics. The reason why polyester, cotton and hemp are particularly preferable is that they have high heat resistance.

Further, it is known that there are four types of general curtains that are popular in the market: drape, lace, casement, and print. The drape curtain is a curtain that forms a drape (wall) that is naturally hung depending on its weight, and is heavy and has a heavy feeling. As a material for the drape curtain, a cloth woven with high density is generally used. This drape curtain has excellent light-shielding properties, shielding properties, soundproofing properties, and heat insulating properties. The lace curtain is thin and transparent. As a material for the lace curtain, cloth or the like in which threads are twisted or combined to woven in a watermark pattern is generally used. The casement curtain is a curtain having an intermediate thickness between the drape and the lace. A relatively thin fabric is generally used as a material for the casement curtain. A print curtain is a curtain in which a pattern is printed on a flat cloth such as organdy, kanoko, and pond. As a material for the print curtain, various materials such as thin cloth and thick cloth are used.

The cloth 3 can use the material of such a general curtain. In this case, since many materials are widely used, they are easily available. Considering that glare is suppressed while exhibiting daylighting performance, among drapes, laces, casements, and prints, it is considered that there are many preferable materials for the cloth 3 among the materials used for the casements. ..

The cloth 3 of the present embodiment preferably has a total light transmittance of 40% or more and 80% or less. The total light transmittance is the ratio of the total transmitted light flux to the parallel incident light flux of the test piece. The total light transmittance can be determined according to JIS K 7361-1:1997. This total light transmittance can be measured by a method according to JIS K 7361:1997 using a haze meter (Murakami Color Research Laboratory, product number; HM-150), for example.

The cloth 3 of the present embodiment preferably has a total light transmittance of 40% or more and 80% or less, or alternatively, a projection transmittance of 40% or more and 95% or less. ..

The “projection transmittance” is a value obtained by the following procedure. That is, when obtaining the "projection transmittance", first, a light source, a transmissive screen, and an image pickup device are prepared, and light is transmitted along one of the normal directions of the transmissive screen from one side thereof. The light is projected from the light source toward the mold screen, a predetermined area where the light of the mold screen is projected by the image pickup device is imaged from the other side in the normal direction of the screen, and the imaged image is binarized. Then, the number of pixels determined to be white is used as a reference value. Next, the cloth is arranged in parallel in the predetermined area of the transmissive screen, and the cloth is arranged in the predetermined area of the transmissive screen from one side of the normal direction of the transmissive screen along the normal direction. Light is projected from the light source toward the front side of the screen, and the cloth arranged in the predetermined area of the transmissive screen is imaged by the imaging device from the other side in the normal direction of the transmissive screen. The number of pixels determined to be is calculated. The ratio of the calculated number of pixels to the reference value is calculated. The ratio calculated in this way is the “projection transmittance”.

Specifically, FIG. 8 shows a projection transmittance measuring device 50 for obtaining the projection transmittance. In FIG. 8, reference numeral 51 is a light source, reference numeral 52 is a transmissive screen, and reference numeral 53 is an imaging device. Here, as the light source 51, a holographic parallel illumination type HL01 of Pi Photonics Co., Ltd. can be used, and as the imaging device 53, a D7100 manufactured by Nikon can be used. Further, as the transmissive screen, a mobile screen high clear type PBWSA13A manufactured by ALBEDO can be used.

The inventors of the present invention have conducted extensive studies and found that the cloth 3 having a total light transmittance of 40% to 80% or the cloth 3 having a projected transmittance of 40% to 95% is used as the daylighting sheet 2. In the case where the light control sheet 4 is combined with each other, the light control sheet 4 and the curtain 1 including the light control sheet 4 can exhibit suitable daylighting performance and can suppress glare and glare. I found out.

Conventionally, a roll curtain provided with a deflecting layer for obtaining a daylighting effect causes a glaring feeling or glare peculiar to a material such as a resin, and such a glare feeling or glare reduces the designability of the roll curtain. It was In order to solve this problem, the inventor of the present application has studied to suppress the feeling of glare and glare by covering the deflection layer with another member. However, in this case, an effective lighting effect cannot be obtained by simply covering the deflection layer with a member. Therefore, the inventor of the present invention has examined the characteristics of the cloth that can effectively obtain the lighting effect. Specifically, focusing on the total light transmittance of the cloth and the above-mentioned projection transmittance, various experiments were conducted to investigate the relationship between this and the light-collecting effect, and the above findings were obtained.

(Experiment on total light transmittance)
In the experiment on the total light transmittance, a plurality of cloths having a total light transmittance of about 10% to 90% are combined with the daylighting sheet 2 which emits the incident light so as to jump up as described above, and Along with the evaluation, the designability was evaluated.

The evaluation of the lighting effect was performed by the evaluation methods 1 and 2 described below, and the evaluation of the design property was performed by visually observing whether or not a glare or glare occurred. Hereinafter, the lighting effect evaluation methods 1 and 2 and the evaluation results thereof will be described.

Evaluation method 1
The evaluation of the lighting effect according to the evaluation method 1 was performed by the first evaluation device 80 schematically shown in FIG. The said 1st evaluation apparatus 80 is formed in the rectangular parallelepiped shape which has a bottom wall part, a side wall part, and a top wall part, and the dark box 82 in which the light opening part 81 was formed in the side wall part, and the light opening part 81 of the dark box 82. A sample holder 83 provided on the outer peripheral edge, a light source 84 provided on the outer side of the sample holder 83 for irradiating light toward the sample and the light opening 81 held by the sample holder 83, and a dark box 82. And an illuminance meter 85 provided inside.

In the first evaluation device 80, as shown in FIG. 9, the sample holding unit 83 is placed at the position of the origin in the space defined by the X axis, the Y axis, and the Z axis defined so as to be orthogonal to each other. The sample is held in such a manner that the planar shape of the plate-shaped, film-shaped, or plate-shaped sample extends in parallel with the Z-axis direction and the Y-axis direction so as to face the light opening 81. In the illustrated example, the X axis is the horizontal direction and is parallel to the normal direction of the sample held by the sample holding unit 83. The Y axis is orthogonal to the X axis and parallel to the horizontal direction, and the Z axis is parallel to the vertical direction.

The light source 84 is movable on an imaginary plane passing through the Z axis and the X axis while changing the inclination angle with respect to the X axis, and is capable of changing the incident angle and injecting light to the sample held at the origin position. Has become. Specifically, the light source 84 is rotatable and movable on a virtual plane passing through the Z axis and the X axis around the center of the sample held by the sample holding unit 83 or in the vicinity thereof, and the position (0 Degree) and a position on the Z axis (90 degrees) on one side (upper side) in the Z axis direction.

As the light source 84, a parallel light source “Hololite Power HLP30” manufactured by Pi Photonics KK can be used. Further, in the apparatus shown in FIG. 9, the inner wall of the dark box 82 is subjected to black alumite processing, black nickel processing, black chrome processing, etc., and the visible light reflectance on the inner wall of the dark box 82 is 10% or less, more preferably. Is suppressed to about 5%. Further, it is preferable to perform the evaluation test with the dark box 82 and the light source 84 covered with a dark curtain.

Further, the illuminance meter 85 is arranged on a virtual plane passing through the Z axis and the X axis in the dark box 82, and can measure the illuminance of the light incident from the light opening 81. As the illuminance meter 85, "T-10MA" manufactured by Konica Minolta can be used. In the example shown in FIG. 9, three illuminance meters 85 are provided. One of the three illuminometers measures 135 mm from the sample on a straight line L1 extending along the X axis from the end on one side (upper side) in the Z axis direction of the sample held by the sample holding unit 83. It is located in a position. The other illuminometer 85 is arranged at a position 595 mm from the sample on the straight line L1. Still another illuminometer 85 is one side in the Z-axis direction from a straight line L2 extending along the X-axis from the other side (lower side) end in the Z-axis direction of the sample held in the sample holding section 83. It is located at a position 300 mm away from the sample (upper side) and 800 mm away from the sample along the X axis. The position of the illuminometer 85 described here is a position peculiar to this experimental example, and the arranging position of the illuminometer 85 may be in another mode.

In the evaluation of the lighting effect by the evaluation method 1, a substantially colorless and transparent transparent acrylic plate is held in the sample holding portion 83, and as shown in FIG. 9, the light source 84 is set at the position of “20 degrees” in this example. The light was incident on the transparent acrylic plate by moving it to set the incident angle of light. Then, the illuminance measurement values measured by the three illuminance meters 85 were added to obtain the reference illuminance total value. After that, a combination of each of the plurality of cloths having a total light transmittance of about 10% to 90% and the lighting sheet 2 is attached to the transparent acrylic plate, and held in the sample holding portion 83, as described above. Light was incident under the same conditions as the incidence of light on the transparent acrylic plate. Then, the illuminance measurement values measured by the three illuminometers 85 were added to calculate an experimental illuminance total value, which was compared with the reference illuminance total value.

Then, when the total value of the experimental illuminance is larger than the total value of the reference illuminance, it was evaluated that the lighting effect can be obtained. This is because if the total experimental illuminance value is larger than the reference illuminance total value, the amount of incident light jumping up on the exit side is larger than that of a simple transparent acrylic plate, and therefore it can be evaluated that the daylighting effect is effectively exhibited. Is.

Then, the present inventor examined the evaluation result of the daylighting effect by the evaluation method 1 for the combination of the plurality of cloths having the total light transmittance of about 10% to 90% and the daylighting sheet 2, and found that the total experimental illuminance was As a feature common to those whose values are larger than the total reference illuminance, it was found that the total light transmittance was 40% or more. If the total light transmittance of the cloth was 40% or more, the experimental illuminance total value was It became larger than the standard illuminance total value, and it was found that it can be evaluated that the lighting effect was obtained. On the contrary, it was found that the cloth having the total light transmittance of less than 40% cannot obtain the lighting effect.

Evaluation method 2
On the other hand, the evaluation of the lighting effect according to the evaluation method 2 was performed by the second evaluation device 100 schematically shown in FIG. The second evaluation apparatus 100 includes a sample holding unit 101 for holding a sample, a light source 102 arranged on one side of the sample holding unit 101, and an optical alignment measuring device 103 arranged on the other side of the sample holding unit 101. ,have.

In the second evaluation apparatus 100, as shown in FIG. 10, the sample holding unit 101 is placed at the position of the origin in the space defined by the X axis, the Y axis, and the Z axis defined so as to be orthogonal to each other. The sample is held so that the planar direction of the plate-shaped, film-shaped, or plate-shaped sample extends parallel to the Z-axis direction and the Y-axis direction. In the illustrated example, the X axis is the horizontal direction and is parallel to the normal direction of the sample held by the sample holding unit 101. The Y axis is orthogonal to the X axis and parallel to the horizontal direction, and the Z axis is parallel to the vertical direction.

As the light source 101, a metal halide fiber light source MH-100 manufactured by DOLAN-JENNER was used. The light source 101 moves on an imaginary plane passing through the Z axis and the X axis by changing the tilt angle with respect to the X axis, and can change the incident angle of the sample held at the origin position to make the light incident. It is possible. Specifically, the light source 102 is rotatable and movable on a virtual plane passing through the Z axis and the X axis around the center of the sample held by the sample holding unit 101 or the vicinity thereof, and the position (0 Degree) and one side (upper side) in the Z-axis direction and a position on the Z-axis (90 degrees).

Further, the optical orientation measurement device 103 has a hemispherical integrating sphere, and the characteristics of the light (luminous intensity, incident on the inside of the integrating sphere from the central region of the integrating sphere through the sample held by the sample holding unit 101). Brightness, illuminance, etc.) can be measured. In this evaluation apparatus 100, as the photo-orientation measuring apparatus 103, ImagingSpare manufactured by Radiant Zemax is used.

In the evaluation of the lighting effect by the evaluation method 2, substantially colorless and transparent soda lime glass is held in the sample holding portion 101, and as shown in FIG. 10, the light source 101 is set at intervals of 10 degrees between 0 degrees and 60 degrees. The light was moved to set an incident angle of light, and the light was incident on a blue plate glass (made by Central Glass, thickness 2.9 mm). Then, for each incident angle, the light amount of the light transmitted through the soda lime glass toward the upper half which is the one side portion in the Z-axis direction, that is, the direction indicated by 90° to 180° in FIG. The upper half transmittance [%], which is the ratio of the measured value to the light amount of the light emitted from the light source, was calculated. Then, all the upper half transmittances specified for each of the seven incident directions set in steps of 10 degrees between 0 degree and 60 degrees are added to obtain a total value of the upper half transmittances. It was measured as a rate. After that, a combination of each of a plurality of cloths having a total light transmittance of about 10% to 90% and the lighting sheet 2 is attached to the soda lime glass and held in the sample holding unit 101, and the above-mentioned blue Light was incident under the same conditions as the incidence of light on the plate glass. Then, the upper half transmittance [%] is measured for each of the seven incident directions set in steps of 0° to 60° in steps of 10°, and then the obtained values are obtained. All of the seven upper half transmittances thus obtained were added to measure the experimental transmittance and compared with the above-mentioned reference transmittance.

Then, when the experimental transmittance was higher than the reference transmittance, it was evaluated that the daylighting effect could be obtained. This is because if the experimental transmittance is larger than the reference transmittance, the amount of incident light jumping up on the emitting side is larger than that of mere blue glass, and it can be evaluated that the daylighting effect is effectively exhibited.

Then, the present inventor examined the evaluation result of the daylighting effect by the evaluation method 2 for a combination of a plurality of cloths having a total light transmittance of about 10% to 90% and the daylighting sheet 2, and found that this evaluation method From 2 as well, it was found that the total light transmittance is 40% or more as a characteristic common to those in which the experimental transmittance is larger than the reference transmittance, and if the total light transmittance of the cloth is 40% or more, It was found that the experimental transmittance became larger than the reference transmittance, and it was evaluated that the lighting effect was obtained.

Evaluation whereas the design of the evaluation of design property is visually, was performed to observe whether the glare or glare occurs. As a result of evaluating the design property, it was found that if the total light transmittance of the cloth was 80% or less, it could be evaluated that the feeling of glare and glare did not occur. On the contrary, with respect to the cloth having the total light transmittance of more than 80%, the feeling of glare and glare occurred.

From the above examination, the inventor of the present invention can exhibit suitable lighting performance when used in combination with the lighting sheet 2 if the total light transmittance of the cloth 3 is 40% or more and 80% or less. It was found that the glare and glare were suppressed while being able to do it.

(Experiment on projection transmittance)
On the other hand, in the experiment on the projection transmittance, a plurality of cloths having a projection transmittance of about 10% to 95% were combined with the daylighting sheet 2 that emits the incident light so as to jump up, as described above, and the daylighting effect was obtained. And the designability were evaluated.

The evaluation of the lighting effect is performed by the same method as the evaluation method 1 described above, and the evaluation of the design property is also performed by visually observing whether or not a glare or glare is generated, as in the above. It was The projected transmittance of the cloth was measured by the projected transmittance measuring device 50 shown in FIG.

Then, when the evaluation of the daylighting effect by the same evaluation as the above-described evaluation method 1 for the combination of the plurality of cloths having the projected transmittance of about 10% to 95% and the daylighting sheet 2 was examined, the experimental illuminance total value Is a value that is greater than the total reference illuminance value, we have found that the projected transmittance is 40% or more. If the projected transmittance of the cloth is 40% or more, the total experimental illuminance value is the total reference illuminance value. It became larger than the value, and it was found that it could be evaluated that the lighting effect was obtained. On the contrary, it was found that the cloth having the projected transmittance of less than 40% cannot obtain the lighting effect.

On the other hand, the design property was evaluated by visually observing whether or not a feeling of glare or glare occurred. As an evaluation result of the design property, it was found that if the projected transmittance of the cloth is 95% or less, it can be evaluated that no glare or glare is caused. On the contrary, with respect to the cloth having the projected transmittance of more than 95%, the feeling of glare and the glare occurred.

From the above examination, the inventor of the present application can exhibit suitable lighting performance when used in combination with the lighting sheet 2 when the projection transmittance of the cloth 3 is 40% or more and 95% or less. At the same time, it was found that glare and glare were suppressed.

(Method of manufacturing light control sheet)
Next, an example of a method of manufacturing the light control sheet 4 according to the present embodiment will be described.

First, the constituent materials and manufacturing process of the daylighting sheet 2 according to the present embodiment will be described. As the base material layer 6, for example, a transparent film such as polyethylene terephthalate (PET) or polycarbonate (PC) can be used.

Next, the protrusions 12 of the deflection layer 7 are made of, for example, a curable material such as epoxy acrylate, which has a characteristic of being cured by irradiation with ionizing radiation such as an electron beam or ultraviolet rays. The deflection layer 7 can be formed by a method using a roll type having a convex portion corresponding to the structure of the void 11. That is, a roll mold is prepared in which irregularities capable of transferring the protrusions 12 of the deflection layer 7 are provided on the outer peripheral surface of the cylindrical roll. Then, the base body to be the base layer 6 is inserted between the roll type and the nip roll arranged so as to face the roll type. Then, the roll mold and the nip roll are rotated while supplying the curable resin forming the protrusions 12 between one surface of the substrate and the roll mold. As a result, the curable resin is filled inside the projections and depressions formed on the surface of the roll mold, and the projections 12 are formed.

Next, a step of stacking the cloth 3 on the daylighting sheet 2 is performed. The stacking method is not particularly limited, but here, the cloth 3 and the daylighting sheet 2 are stacked via an adhesive layer. The composition of the adhesive layer includes, for example, one or more of polyvinyl acetal resin which is a thermoplastic resin, ethylene vinyl acetate copolymer resin, ethylene acrylic copolymer resin, polyurethane resin and polyvinyl alcohol resin, a plasticizer, and an oxidizer. It may be used by mixing it with an additive such as an inhibitor and an ultraviolet shielding agent, or may be formed by mixing an acrylic resin adhesive material, a cross-linking agent, and a diluent. The composition of the adhesive layer is formed into a sheet or film and is placed between the daylighting sheet 2 and the cloth 3, and air is pushed out by applying pressure to heat the daylighting sheet 2 and the cloth 3 into one body. It can be transformed.

In the light control sheet 4 or the curtain 1 including the light control sheet 4 according to the present embodiment described above, the light control sheet 4 has the entrance surface 7a and the exit surface 7b that face each other, and A deflecting layer 7 that deflects incident light to be emitted from the emitting surface 7b, and a sheet-like cloth 3 that is laminated with the deflecting layer 7 are provided.

With only the daylighting sheet 2, there is a possibility that glare and glare due to an increase in external light due to the provision of the void portion 12 may be sensed. However, by integrating the daylighting sheet 2 and the cloth 3, it is high. The cloth 3 can suppress the glare and glare while exhibiting the daylighting performance. Further, since the cloth 3 can improve the degree of freedom in design selection regarding color, design, and material, excellent designability can be secured. Further, since the cloth 3 is flexible, it does not hinder the winding of the light control sheet 4 and the like, and does not hinder the transportability of the light control sheet 4. Further, it can be suitably used even when applied to a roll curtain. Therefore, according to the light control sheet 4 or the curtain 1 including the light control sheet 4 according to the present embodiment, suitable lighting performance can be exhibited, excellent designability can be secured, and handleability is improved. Excel.

In addition, when the total light transmittance of the cloth 3 is 40% or more and 80% or less, the lighting performance can be more reliably exhibited, and the feeling of glare and glare can be suppressed and the designability is improved. be able to. Further, even when the projected transmittance of the cloth 3 is 40% or more and 95% or less, it is possible to more reliably exhibit the lighting performance, suppress the glare and glare, and improve the design. You can

Further, in the curtain 1 according to the present embodiment, the weight member 21C is provided at the other end of the light control sheet 4. In this case, when the light control sheet 4 hangs down from the shaft member 21A, the light control sheet 4 extends straight in the vertical direction. This stabilizes the position of the deflecting layer 7 and stabilizes the emitted light, so that the daylighting effect can be effectively obtained.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments. For example, in the above-described embodiment, the example in which the curtain 1 to which the light control sheet 4 is applied is a roll curtain has been described, but the light control sheet 4 is also applicable to blinds, accordion curtains, blinds, and the like. In the blind, it is preferable to provide the weight member 21C as described above at the lower end of each louver portion. The light control sheet 4 can also be attached to a window glass or the like for use.

(Example)
Hereinafter, each embodiment in which the curtain 1 of the present invention is made more concrete will be described.

Example 1
In Example 1, each cloth used for roll curtain (roll screen) model numbers RS-5055, RS-5612, RS-5771 sold by Tachikawa Blind Industry Co., Ltd., and Nichibay Co., Ltd. sells. The cloth used in the roll curtain model number N6342 and the commercially available white, pink, and red cloths were used as the cloth 3 in the light control sheet 4.

First, the total light transmittance and the projected transmittance of each cloth are measured, and then each cloth is combined with the daylighting sheet 2 having the configuration shown in FIG. 2 to evaluate the daylighting effect and to evaluate the design. went. In this example, the height (H) of the protrusions 12 was 52 μm, and the pitch (P) of the protrusions was 40 μm. The evaluation of the lighting effect was performed using the second evaluation device 100 (see FIG. 10) according to the evaluation method 2 described above.

The total light transmittance of each cloth is shown in Table 1 below, and the projected transmittance of each cloth is shown in Table 2 below. Table 3 shows the evaluation of the lighting effect by the evaluation method 1 for the combination of each cloth with the lighting sheet 2. Table 3 shows the measured value [%] of the upper half transmittance measured in each incident direction. Further, in the column of "total value of 0-60 degrees" in Table 3, reference transmittance is shown for glass, and experimental transmittance is shown for other samples. Furthermore, “Comparison with glass” in Table 3 is the value of (experimental transmittance/reference transmittance)×100 [%] described in Evaluation Method 2 above. If it is larger than 100%, the effect of daylighting is effective. It can be evaluated that it is expressed. In addition, Table 3 also shows the reference transmittance which is the result when light is incident on the soda-lime glass based on the evaluation method 2.

Further, FIG. 11 shows a graph showing the relationship between the total light transmittance and the lighting effect according to the first embodiment.

Next, each cloth was combined with the daylighting sheet 2 to form the curtain 1 as the light control sheet 4, and the curtain 1 was actually installed. When the usage situation when actually used as the curtain 1 is observed, when the total light transmittance of the cloth 3 is 40% or more (white, pink, N6342, RS-5055, RS-5612), the lighting performance is improved. I was able to confirm that I was able to demonstrate. Further, it was confirmed that when the projected transmittance of the cloth 3 was 40% or more, the lighting performance was exhibited. On the other hand, in all the curtains 1 according to Example 1, no glare or glare occurs, the total light transmittance of the cloth 3 is 80% or less, and the projected transmittance of the cloth 3 is 95%. It was also confirmed that glare and glare were suppressed in the cases below.

Further, it was possible to wind the light control sheet 4 according to Example 1 around the 28 mm shaft member 21A without any trouble. From this, it was confirmed that each cloth did not hinder the winding of the light control sheet 4 and the like, and did not hinder the transportability and the like of the light control sheet 4.

1 Roll Curtain 2 Daylighting Sheet 3 Cloth 4 Light Control Sheet 6 Base Layer 7 Deflection Layer 7a Incident Surface 7b Outgoing Surface 11 Void 12 Protrusion 12a First Surface 12b Second Surface 14 Light-Shielding Part 15 Protective Layer 16 Second Protrusion 21 Roll Mechanism 21A Shaft Member 21B Frame Member 21C Weight Member 22 Chain 50 Projection Transmittance Measuring Device 51 Light Source 52 Transmissive Screen 53 Imaging Device 80 First Evaluation Device 81 Light Opening 82 Dark Box 83 Sample Holding Unit 84 Light Source 85 Illuminance Meter 100 First evaluation device 101 Sample holder 102 Light source 103 Optical orientation measuring device D Curved portion H Height of protrusions P Pitch of protrusions L1, L2 Straight line

Claims (6)

A base material layer having an entrance surface and an exit surface facing each other, and having a main surface facing each other, and laminated on one main surface of the base material layer, and deflects light incident from the entrance surface to output the exit surface A deflection layer for emitting light from the
A light control sheet comprising a cloth laminated with the deflection layer, comprising:
The total light transmittance of the cloth is 50.5% or more and 70.9% or less, and the projection transmittance is 64.1% or more and 94.5% or less,
The sheet and film are integrated with the daylighting sheet and the cloth via an adhesive layer arranged between the daylighting sheet and the cloth,
The light control sheet, wherein the deflection layer has a plurality of light-transmitting projections and voids formed between the projections. The light control sheet according to claim 1, further comprising a light shielding part so as to close the space between the protrusions. The light control sheet according to claim 1 or 2 , wherein the cloth includes any one of plant fiber, animal fiber, and chemical fiber, or at least two of them. And a light control sheet according to any one of claims 1 to 3, the curtain. Equipped with a shaft member,
The curtain according to claim 4 , wherein one end of the light control sheet is attached to the shaft member, and the light control sheet is configured to be wound around the shaft member and unfoldable. The curtain according to claim 5 , wherein a weight member is provided on the other end of the light control sheet.

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