JP2018003239A - Light control sheet and curtain comprising the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light control sheet capable of exerting favorable daylighting performance and securing an excellent design, excellent in handling properties.SOLUTION: The light control sheet comprises a deflection layer 7 having an incident surface 7a and an emission surface 7b opposed to each other, which deflects the light incoming from the incident surface 7a and emits the light from the emission surface 7b, and a fabric 3 in a sheet form laminated on the deflection layer 7.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a light control sheet for controlling external light such as sunlight that enters a building or the like and a curtain including the light control sheet.

  For example, there is 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 cloth such as polyester.

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

  On the other hand, various types of roll curtains that emphasize functionality have been proposed. For example, Patent Literature 1 and Patent Literature 2 disclose roll curtains including a deflecting layer that deflects incident light in a desired direction and emits it in order to obtain a daylighting effect indoors.

JP2013-15569A JP 2012-224975 A

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

  As a technique for suppressing the glare and glare, it is conceivable to provide a sheet-like member so as to cover the deflection layer. However, the lighting performance may not be sufficiently exerted by simply providing the member on the deflection layer. Further, if the material of the member is hard, 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 points, and can exhibit suitable daylighting performance, can ensure excellent designability, and has a light control sheet excellent in handleability. An object is to provide a curtain provided.

  The present invention has an entrance surface and an exit surface facing each other, a deflection layer that deflects light incident from the entrance surface and emits the light from the exit surface, a sheet-like cloth laminated with the deflection layer, A light control sheet.

  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 include any one of plant fibers, animal fibers, and chemical fibers, or at least two of them.

  Moreover, this invention is a curtain provided with the said light control sheet | seat.

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

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

  In the curtain, an outer diameter of the shaft member may be 25 mm to 120 mm.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to exhibit suitable lighting performance, the outstanding design property can be ensured and the light control sheet | seat which is excellent in handleability, and a curtain provided with the same can be provided.

It is a perspective view of a curtain provided with the light control sheet by an embodiment of the invention. It is a fragmentary sectional view in the vertical direction of the curtain of FIG. It is the schematic of the projection transmittance measuring apparatus for calculating | requiring this projection transmittance of this Embodiment. It is the schematic of the 1st evaluation apparatus for evaluating a lighting effect. It is the schematic of the 2nd evaluation apparatus for evaluating a lighting effect. It is the figure which showed the graph which shows the relationship between the total light transmittance concerning Example 1, and the lighting effect. It is the figure which showed the graph which shows the relationship between the projection transmittance | permeability concerning Example 1, and a lighting effect. It is the figure which showed the graph which shows the relationship between the total light transmittance concerning Example 2, and the lighting effect. It is a fragmentary sectional view of the light control sheet explaining the modification of the light control sheet concerning this Embodiment.

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

  In the drawings attached to the present specification, for the sake of illustration and ease of understanding, the scale, the vertical / horizontal dimension ratio, and the like are appropriately changed and exaggerated from those of the actual product.

  Further, in this specification, the terms “sheet”, “film”, and “plate” are not distinguished from each other only based on the difference in designation. For example, the “sheet” is a concept including a member that can be called a film or a plate.

  Further, as used in the present specification, the shape and geometric conditions and the degree thereof are specified, for example, terms such as “parallel”, “orthogonal”, “identical”, etc. are not bound to a strict meaning, Interpretation should include the extent to which similar functions can be expected.

  Furthermore, the “sheet surface (film surface, plate surface)” means the target sheet-like member (film-like member) when the target sheet-like (film-like, plate-like) member is viewed as a whole and globally. , A plate-like member) means a surface coinciding with the planar direction.

(Composition of curtain)
FIG. 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 inside the window, for example. Hereinafter, the roll curtain 1 is simply referred to as the curtain 1.

  As shown in FIGS. 1 and 2, the curtain 1 according to the present embodiment includes a daylighting sheet 2 disposed on the light incident side, and a sheet disposed in a stacked manner on the emission surface side of the daylighting sheet 2. And a light control sheet 4 including a cloth 3. A roll mechanism 21 for winding the light control sheet 4 is provided on the top of 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 so as to hang down from the roll mechanism 21 in a U shape.

  The roll mechanism 21 includes a shaft member 21A and a frame member 21B that rotatably supports both end portions 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 supports the shaft member 21A and the light control sheet 4 by being fixed to an upper edge portion or the like of a building window. Further, the other end of the light control sheet is provided with a shaft-shaped weight member 21C extending in parallel with the shaft member 21A. 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 in a state where the chain 22 hangs down, the winding amount of the light control sheet 4 is reduced and the light control sheet 4 is pulled out further downward. It has become. Further, when the other hanging portion of the chain 22 is lowered, the winding amount of the light control sheet 4 increases, and the light control sheet 4 moves upward. That is, the light control sheet 4 is configured to be wound and unfolded around the shaft member 21A.

(Configuration of light control sheet)
FIG. 2 shows cross sections of the daylighting sheet 2 and the cloth 3 in the light control sheet 4. As shown in FIG. 2, the daylighting sheet 2 in the present embodiment has a base material layer 6 having opposing main surfaces and a deflection layer 7 laminated on one main surface of the base material layer 6. ing. The base material layer 6 is a layer formed in a sheet shape that supports the deflection layer 7 and has translucency. On the other hand, the deflection layer 7 has a light incident surface 7a and a light emission surface 7b facing each other, and is a layer that deflects light incident from the light incident surface 7a and emits the light from the light emission surface 7b. In the daylighting sheet 2, a protective layer may be provided in addition to the base material layer 6 and the deflection layer 7. Moreover, a heat ray cut layer, an ultraviolet ray cut layer, or the like may be provided. In the daylighting sheet 2, the base material layer 6 may be omitted.

  In the illustrated example, the deflection layer 7 includes a base portion 11 having a plurality of grooves 10 that are spaced apart along the incident surface 7 a, and a refractive index different from that of the base portion 11 and is disposed in the plurality of grooves 10. And a plurality of louver portions 12. The interior of the louver portion 12 may be hollow, or may be filled with a filling material having a refractive index different from that of the base portion 11, typically a refractive index lower than that of the base portion 11. Such a deflection layer 7 may cause glare or glare due to reflection or refraction at the interface between the base portion 11 and the louver portion 12.

  The louver part 12 has a first surface 12a and a second surface 12b extending in a direction intersecting the incident surface 7a. The louver part 12 changes the traveling direction of light based on the difference in refractive index between the base part 11 and the louver part 12 at least on the first surface 12 a of the interface with the base part 11. FIG. 2 shows an example of an asymmetric structure in which all the illustrated louver portions 12 have first and second surfaces 12a and 12b having different shapes, but the shapes of the first surface 12a and the second surface 12b are the same. It may be a symmetric structure.

  As shown by the arrow in FIG. 2, the deflecting layer 7 in the present embodiment deflects the light incident from the incident surface 7a so as to jump up obliquely and emit the light from the emitting surface 7b. ing. Note that the cross-sectional structure of the daylighting sheet 2 does not necessarily need to be composed of the base portion 11 and the louver portion 12 as shown in FIG. For example, a plurality of optical prism bodies may be arranged along the incident surface 7a, and the incident light may be slanted upward. Even in the deflection layer 7 using the optical prism body, there is a possibility that glare or glare is sensed due to reflection or refraction on the prism surface.

  In addition, as shown in FIG. 2, the cloth 3 in the present embodiment is provided in order to ensure the designability of the light control sheet 4. This cloth 3 has translucency. This is because the daylighting effect of the daylighting sheet 2 is lost when no light is transmitted. In the present embodiment, such a cloth 3 is laminated on the emission surface 7 b of the deflection layer 7 via the adhesive layer 13. The adhesive layer 13 is a thermoplastic resin or the like and has translucency. In addition, it is preferable that the cloth 3 is provided so as to cover the entire surface of the deflecting layer 7 from the viewpoint of making the glare and glare caused by the deflecting layer 7 inconspicuous. It is preferable that a single cloth 3 is provided in a region that is easy to do, for example, in a central region excluding the periphery of the deflection layer 7.

  In the example shown in FIG. 2, these elements are laminated in the order of the base material layer 6, the deflection layer 7, the adhesive layer 13, and the cloth 3 from the light incident side to the light emission side. ing. However, as shown in FIG. 9, these elements are laminated in the order of the deflection layer 7, the base material layer 6, the adhesive layer 13, and the cloth 3 from the light incident side to the light emission side. The light control sheet 4 or the curtain 1 may be configured.

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

  Plant fibers are cotton, hemp and the like, and animal fibers are silk, wool, alpaca, Angola, cashmere, mohair and the like. The chemical fiber is a recycled fiber, semi-synthetic fiber, synthetic fiber, inorganic fiber, or the like. Examples of recycled fibers include fibrous materials such as rayon, cupra, and polynosic. Examples of semisynthetic fibers include fibrous materials such as acetate, triacetate, and promix. Examples of synthetic fibers include fibrous materials such as nylon, polyester, acrylic, polyvinyl chloride, and polyurethane. Furthermore, 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 which 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 widely available as general curtain fabrics, so that they are easily available and the cost can be reduced. Moreover, the reason why polyester, cotton and hemp are particularly preferable is that the heat resistance is high.

  Moreover, it is known that there are four types of general curtains that are widely used in the market: drape, lace, casement, and print. A drape curtain is a curtain that forms a drape (wall) that hangs down naturally due to its weight, and is heavy and heavy. As a material for the drape curtain, a cloth woven at a high density is generally used. This drape curtain is excellent in light shielding properties, shielding properties, soundproofing properties, and heat insulation properties. The lace curtain is thin and has transparency. As a material of the lace curtain, a cloth knitted into a watermark pattern by twisting or combining yarns is generally used. The casement curtain is a curtain having a thickness intermediate between drape and lace. A relatively thin fabric is generally used as a material for the casement curtain. The print curtain is a curtain in which a pattern is printed on a flat cloth such as organdy, kanoko or ponji. As a material of the print curtain, various materials are used from a thin cloth to a thick cloth.

  The cloth 3 can utilize such a general curtain material. In this case, since many materials are prevalent, it is easy to obtain. Considering the suppression of glare while exhibiting daylighting performance, it is considered that there are many materials that are preferable as the fabric 3 among the materials used for casement in drape, lace, casement, and print. .

  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 beam to the parallel incident light beam of the test piece. The total light transmittance can be determined according to JIS K 7361-1. This total light transmittance can be measured by the method based on JISK7361 using a haze meter (Murakami Color Research Laboratory make, product number; HM-150, for example).

  Further, the cloth 3 of the present embodiment preferably has a projected transmittance of 40% or more and 95% or less in addition to or instead of having a total light transmittance of 40% or more and 80% or less. .

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

  Specifically, FIG. 3 shows a projected transmittance measuring apparatus 50 for obtaining the projected transmittance. In FIG. 3, reference numeral 51 denotes a light source, reference numeral 52 denotes a transmissive screen, and reference numeral 53 denotes an imaging device. Here, as the light source 51, Phiphotonics Co., Ltd.'s Hololite parallel illumination type HL01 can be used, and as the imaging device 53, Dkon 7100 made by Nikon Corporation can be used. Moreover, ALBEDO mobile screen high clear type PBWSA13A can be used as a transmission type screen.

  As a result of extensive research, the present inventor has found that the cloth 3 having a total light transmittance of 40% or more and 80% or less, or the cloth 3 having a projection transmittance of 40% or more and 95% or less in the daylighting sheet 2. When the light control sheet 4 is configured in combination, the light control sheet 4 and the curtain 1 including the light control sheet 4 can exhibit suitable lighting performance, and can suppress glare and glare. I found out.

  Conventionally, a roll curtain having a deflection layer for obtaining a daylighting effect has a glare and glare peculiar to a material such as a resin, and such a glare and glare has lowered the design of the roll curtain. It was. In order to solve this problem, the inventors of the present invention studied to suppress glare and glare by covering the deflection layer with another member. However, in this case, an effective daylighting effect cannot be obtained simply by covering the deflection layer with a member. Therefore, the inventor of the present invention examined the characteristics of a cloth that can favorably obtain the lighting effect. Specifically, paying attention to the total light transmittance of the cloth and the above-mentioned projected transmittance, various experiments for examining the relationship between this and the daylighting effect were conducted, and the above-mentioned knowledge was 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 that emits the incident light so as to jump up as described above. While evaluating, the design property was evaluated.

  The evaluation of the daylighting 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 glare or dazzling occurred. Hereinafter, the evaluation methods 1 and 2 of the daylighting effect and the evaluation results will be described.

Evaluation method 1
The evaluation of the daylighting effect according to the evaluation method 1 was performed by the first evaluation apparatus 80 schematically shown in FIG. The first evaluation device 80 is formed in a rectangular parallelepiped shape having a bottom wall portion, a side wall portion, and a top wall portion, and a dark box 82 having a light opening portion 81 formed in the side wall portion, and a light opening portion 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 and irradiating light toward the sample and the light opening 81 held by the sample holder 83, and the dark box 82 And an illuminometer 85 provided inside.

  In the first evaluation apparatus 80, as shown in FIG. 4, 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 that are defined to be orthogonal to each other. The sample is held so that the planar direction of the sample in the shape of a film, film, or plate extends in parallel with the Z-axis direction and the Y-axis direction and faces the light opening 81. In the illustrated example, the X axis is the horizontal direction and 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 moves by changing the tilt angle with respect to the X axis on a virtual plane passing through the Z axis and the X axis, and allows the light to enter the sample held at the origin position by changing the incident angle. It has become. Specifically, the light source 84 can be rotated 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 on the X axis (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 Pyphotonics can be used. Further, in the apparatus shown in FIG. 4, the inner wall of the dark box 82 is subjected to black anodizing, black nickel, black chrome, etc., and the visible light reflectance on the inner wall of the dark box 82 is more preferably 10% or less. Is suppressed to about 5%. Moreover, it is preferable to perform an evaluation test in a state where the dark box 82 and the light source 84 are covered with a dark screen.

  The illuminance meter 85 is disposed on a virtual plane passing through the Z axis and the X axis in the dark box 82 and can measure the illuminance of light incident from the light opening 81. As the illuminance meter 85, “T-10MA” manufactured by Konica Minolta, Inc. can be used. In the example shown in FIG. 4, three illuminance meters 85 are provided. One of the three luminometers is 135 mm from the sample on a straight line L1 extending along the X axis from one end (upper side) of the sample held in the sample holding unit 83 in the Z-axis direction. Placed in position. Further, the other illuminance meter 85 is arranged at a position of 595 mm from the sample on the straight line L1. Further, another illuminance meter 85 is provided on the one side in the Z-axis direction from the straight line L2 extending along the X-axis from the other side (lower side) end in the Z-axis direction of the sample held by the sample holding unit 83. It is located at a position 300 mm away from (upper) and 800 mm away from the sample along the X axis. Note that the position of the illuminance meter 85 described here is a position unique to this experimental example, and the arrangement position of the illuminance meter 85 may be in another form.

  In the evaluation of the daylighting effect by the evaluation method 1, a substantially colorless and transparent transparent acrylic plate is held in the sample holding unit 83, and as shown in FIG. 4, the light source 84 is positioned at “20 degrees” in this example. The incident angle of light was set and the light was incident on the transparent acrylic plate. The illuminance measurement values measured by the three illuminance meters 85 were added to obtain a “reference illuminance total value”. Thereafter, a combination of each of the plurality of cloths having a total light transmittance of about 10% to 90% and the daylighting sheet 2 was bonded to the transparent acrylic plate and held in the sample holding unit 83, as described above. Light was incident under the same conditions as the light incident 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” and compared with the reference illuminance total value.

  Then, when the reference illuminance total value was larger than 100% of the experimental illuminance total value, it was evaluated that the lighting effect was obtained. This is because if the reference illuminance total value is larger than 100% of the experimental illuminance total value, the amount of incident light jumping up on the exit side is larger than that of a simple transparent acrylic plate, so that the lighting effect is effectively expressed. This is because it can be evaluated.

  And this inventor examined the evaluation result of the lighting effect by the evaluation method 1 about what combined the several sheet | seat with the total light transmittance of about 10%-90%, and the daylighting sheet 2, "standard illumination intensity" As a feature common to those in which the “total value” is larger than 100% of the “experimental illumination total value”, it is found that the total light transmittance is 40% or more, and the total light transmittance of the cloth is 40% or more. For example, it was found that the reference illuminance total value is larger than 100% of the experimental illuminance total value, and it can be evaluated that the lighting effect is obtained. On the other hand, it was found that no daylighting effect was obtained for a fabric having a total light transmittance of less than 40%.

Evaluation method 2
On the other hand, evaluation of the lighting effect according to the evaluation method 2 was performed by the second evaluation apparatus 100 schematically shown in FIG. The second evaluation apparatus 100 includes a sample holding unit 101 that holds a sample, a light source 102 that is arranged on one side of the sample holding unit 101, and a light orientation measurement apparatus 103 that is arranged on the other side of the sample holding unit 101. ,have.

  In the second evaluation apparatus 100, as shown in FIG. 5, 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 that are defined to be orthogonal to each other. The sample is held such that the planar direction of the sample in the shape of a film, film, or plate extends in parallel with the Z-axis direction and the Y-axis direction. In the illustrated example, the X axis is the horizontal direction and parallel to the normal direction of the sample held in 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 102, a metal halide fiber light source MH-100 made by DOLAN-JENNER was used. This light source 102 moves on a virtual plane passing through the Z axis and the X axis while changing the tilt angle with respect to the X axis, and allows the light to be incident on the sample held at the origin position while changing the incident angle. It is possible. Specifically, the light source 102 can rotate 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 is positioned on the X axis (0 Degree) and a position on the Z axis (90 degrees) on one side (upper side) in the Z-axis direction.

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

  In the evaluation of the daylighting effect by the evaluation method 2, the substantially colorless and transparent blue plate glass is held in the sample holding unit 101, and the light source 101 is set in steps of 10 degrees between 0 degrees and 70 degrees as shown in FIG. The incident angle of the light was set by moving the light, and the light was incident on the blue plate glass. Then, for each incident angle, the amount of light transmitted through the soda-lime glass toward the upper half that is a portion on one side 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 amount of light emitted from the light source, was calculated. Then, all the upper half transmittances specified for each of the eight incident directions set in increments of 10 degrees between 0 degrees and 70 degrees are added to obtain a total value of the upper half transmittances. Measured as "transmittance". Thereafter, a combination of each of the plurality of cloths having a total light transmittance of about 10% to 90% and the daylighting sheet 2 is bonded to the blue plate glass and held on the sample holding unit 101, and the blue color described above. Light was incident under the same conditions as the light incident on the plate glass. Then, for each of the eight incident directions set in steps of 10 degrees between 0 degrees and 70 degrees, the upper half transmittance [%] is measured in the same manner as in the case of the above-described blue plate glass, and then obtained. All the eight upper half transmittances obtained were added and measured as “experimental transmittance” and compared with the above-mentioned reference transmittance.

  When the “experimental transmittance” is larger than 100% of the “reference transmittance”, it was evaluated that the lighting effect was obtained. This is because if the experimental transmittance is larger than 100% of the standard transmittance, the amount of incident light jumping up on the exit side is larger than that of mere blue glass, so it can be evaluated that the lighting effect is effectively expressed. It is.

  And when this inventor examined the evaluation result of the lighting effect by the evaluation method 2 about what combined the several cloth and the lighting sheet 2 whose total light transmittance is about 10%-90%, this evaluation method 2 also found that the total light transmittance is 40% or more as a feature common to those in which the experimental transmittance is larger than 100% of the standard transmittance, and the total light transmittance of the cloth is 40% or more. If it exists, it turned out that it can evaluate that experimental transmittance | permeability will become larger than 100% of reference | standard transmittance | permeability, and the lighting effect will be acquired.

Evaluation of design properties On the other hand, the evaluation of design properties was carried out by visually observing whether glare or dazzling occurred. As an evaluation result of the designability, it was found that if the total light transmittance of the cloth was 80% or less, it was possible to evaluate that no glare or dazzling occurred. On the other hand, with respect to the cloth having a total light transmittance of more than 80%, glare and dazzle occurred.

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

(Experiment on projected 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% are combined with the daylighting sheet 2 that emits the incident light so as to jump up as described above, and the daylighting effect is obtained. And the design properties were evaluated.

  The lighting effect is evaluated by the same method as the evaluation method 1 described above, and the design property evaluation is also performed by visually observing whether glare or glare has occurred, as described above. It was. The projected transmittance of the cloth was measured by the projected transmittance measuring device 50 shown in FIG.

  And when the evaluation of the lighting effect by the evaluation similar to 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 “total reference illuminance” As a feature common to those whose “value” is larger than 100% of the “experimental illumination total value”, it is found that the projected transmittance is 40% or more, and if the projected transmittance of the cloth is 40% or more, the standard It was found that the illuminance total value is larger than 100% of the experimental illuminance total value, and that it can be evaluated that the lighting effect is obtained. On the other hand, it was found that the lighting effect could not be obtained for the cloth having a projected transmittance of less than 40%.

  On the other hand, the design property was evaluated by visually observing whether glare or dazzling 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 dazzle has occurred. On the other hand, with respect to the cloth having a projected transmittance of more than 95%, the glare and dazzle occurred.

  From the above examination, the present inventor can exhibit suitable lighting performance when used in combination with the daylighting sheet 2 if the projected 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.

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

  First, the constituent material 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 base portion 11 of the deflecting layer 7 is manufactured using, for example, a curable material such as epoxy acrylate having a characteristic of being cured by irradiation with ionizing radiation such as an electron beam or ultraviolet rays. For forming the base part 11, a roll mold having a convex part corresponding to the configuration of the groove 10 of the base part 11 is used. Next, the resin composition that forms the louver portion 12 by being cured is supplied into the groove 10 of the base portion 11 in an uncured state. Supply of the material constituting the louver portion 12 into the groove 10 is performed using, for example, a doctor blade. As a material forming the louver portion 12, for example, an ionizing radiation curable resin can be used. By curing the material filled in the groove 10, the deflection layer 7 having the base portion 11 and the louver portion 12 is obtained.

  As described above, in the present embodiment, the base portion 11 and the louver portion 12 have different refractive indexes. When the louver part 12 is filled with a filling material, both the base part 11 and the louver part 12 are formed using a curable resin such as a thermosetting resin, an ultraviolet curable resin, and an electron beam curable resin. The base part 11 and the louver part 12 can be provided with a difference in refractive index by changing the material of the resin and the type of additive contained therein.

  Next, a step of laminating the cloth 3 with the daylighting sheet 2 is performed. Here, the cloth 3 and the daylighting sheet 2 are laminated via the adhesive layer 13. The composition of the adhesive layer 13 is, for example, one or more of a thermoplastic resin such as a polyvinyl acetal resin, an ethylene vinyl acetate copolymer resin, an ethylene acrylic copolymer resin, a polyurethane resin, and a polyvinyl alcohol resin. It may be used by mixing with additives such as an antioxidant and an ultraviolet shielding agent, or may be formed by mixing an acrylic resin adhesive, a crosslinking agent, and a diluent. The composition of the adhesive layer 13 is made into a sheet or a film and disposed between the daylighting sheet 2 and the cloth 3, pressurizes the air to extrude the air, and then heats the daylighting sheet 2 and the cloth 3. Can be integrated.

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

  According to this, since the cloth 3 is easy to ensure translucency, the lighting performance can be exhibited, and the cloth 3 can suppress glare and glare. Moreover, since the cloth 3 can improve the selection freedom of the design regarding a color, a design, or a material, the outstanding design property can be ensured. Furthermore, since the cloth 3 is flexible, it does not hinder the winding of the light control sheet 4 or the like, and does not hinder the transportability of the light control sheet 4 or the like. Furthermore, it can be suitably used 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, it is possible to exhibit suitable lighting performance, ensure excellent designability, and handleability. Excellent.

  Moreover, when the total light transmittance of the cloth 3 is 40% or more and 80% or less, the lighting performance can be more surely exhibited, the feeling of glare and glare can be suppressed, and the design is improved. be able to. In addition, even when the projected transmittance of the cloth 3 is 40% or more and 95% or less, the lighting performance can be more reliably exhibited, the feeling of glare and glare can be suppressed, and the design is improved. Can do.

  Further, in the curtain 1 according to the present embodiment, a weight member 21 </ b> C 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. Thereby, since the light emitted is stabilized by stabilizing the position of the deflection layer 7, a daylighting effect can be effectively obtained.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the above-mentioned embodiment. For example, in the above-described embodiment, an example in which the curtain 1 to which the light control sheet 4 is applied is a roll curtain, but the light control sheet 4 can also be applied 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 used by being attached to a window glass or the like.

(Example)
Hereinafter, each Example which actualized the curtain 1 of this invention more is described.

Example 1
In Example 1, each cloth used in roll curtain (roll screen) model number RS-5055, RS-5612, RS-5571, RS-102 sold by Tachikawa Blind Industries Co., Ltd. and Tosoh Corporation The cloth used for the roll curtain model number TR-1071 sold and the cloth used for the roll curtain model numbers N6342 and N6438 sold by Nichibay Co., Ltd. are used as the cloth 3 in the light control sheet 4. It was.

  First, the total light transmittance and the projected transmittance of each cloth were measured, and then each cloth was combined with the daylighting sheet 2 to evaluate the daylighting effect and the design property. Evaluation of the daylighting effect was performed using the first evaluation apparatus 80 (see FIG. 4) according to the evaluation method 1 described above.

  The total light transmittance of each cloth was as shown in Table 1 below, and the projected transmittance of each cloth was as shown in Table 2 below.

  Moreover, the evaluation of the lighting effect by the evaluation method 1 with respect to the combination of each cloth with the daylighting sheet 2 is as shown in Table 3. The increase rate [%] in Table 3 is a value of ((experimental illuminance total value−reference illuminance total value) / reference illuminance total value) × 100 described in the evaluation method 1 described above. It can be evaluated that the reference illuminance total value is larger than 100% of the experimental illuminance total value and the lighting effect is effectively exhibited.

  FIG. 6 shows a graph showing the relationship between the total light transmittance and the daylighting effect according to Example 1, and FIG. 7 shows the relationship between the projection transmittance and the daylighting effect according to Example 1. A graph is shown.

  Next, each cloth was combined with the daylighting sheet 2 to constitute the curtain 1 as the light control sheet 4 and actually installed. As a result of observing the usage situation when actually used as the curtain 1, when the total light transmittance of the cloth 3 was 40% or more, it was confirmed that the lighting performance was surely exhibited. Moreover, when the projected transmittance | permeability of the cloth 3 was 40% or more, it has confirmed that the lighting performance was able to be exhibited reliably. On the other hand, no glare or glare occurs in all curtains 1 according to Example 1, and the total light transmittance of the cloth 3 is 80% or less, and the projected transmittance of the cloth 3 is 95%. In the following cases, it was also confirmed that the glare and glare were suppressed.

  Further, the light control sheet 4 according to Example 1 could be wound around the 28 mm shaft member 21A without any trouble. Thereby, it has confirmed that each cloth did not inhibit the conveyance of the light control sheet 4 or the like without inhibiting the winding of the light control sheet 4 or the like.

Example 2
Next, in Example 2, each cloth used for the roll curtain (roll screen) model number RS-5055, RS-5612, and RS-5771 sold by Tachikawa Blind Industries Co., Ltd., and Nichibayi Co., Ltd. sell it. The cloth used for 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 of each cloth was measured, and then each cloth was combined with the daylighting sheet 2 to evaluate the daylighting effect and the design property. Evaluation of the daylighting effect was performed using the second evaluation apparatus 100 (see FIG. 5) according to the evaluation method 2 described above.

  The total light transmittance of each cloth is as shown in Table 4 below, and the evaluation of the daylighting effect by the evaluation method 2 for the combination of each cloth with the daylighting sheet 2 is as shown in Table 5. Table 5 shows the measured value [%] of the upper half transmittance measured in each incident direction. Further, in the column of “0-70 degrees total value” in Table 5, the standard transmittance is shown for glass, and the experimental transmittance is shown for the other samples. Further, “Comparison with glass” in Table 5 is the value of (experimental transmittance / reference transmittance) × 100 [%] explained in the evaluation method 2 described above, and if it is larger than 100%, the lighting effect is effective. Can be evaluated. Table 5 also shows 100% of the reference transmittance, which is the result when light is incident on the blue sheet glass based on the evaluation method 2.

  FIG. 8 is a graph showing the relationship between the total light transmittance and the daylighting effect according to the second example.

  Next, each cloth was combined with the daylighting sheet 2 to constitute the curtain 1 as the light control sheet 4 and actually installed. When the actual usage of the curtain 1 is observed, when the total light transmittance of the cloth 3 is 40% or more (white, pink, N6342, RS-5055, RS5612), the lighting performance can be exhibited. It was confirmed that On the other hand, no glare or dazzle occurs in all the curtains 1 according to Example 2, and when the total light transmittance of the cloth 3 is 80% or less, the glare and glare are suppressed. It was also confirmed that.

  Further, the light control sheet 4 according to Example 2 could be wound around the 28 mm shaft member 21A without hindrance. Thereby, it has confirmed that each cloth did not inhibit the conveyance of the light control sheet 4 or the like without inhibiting the winding of the light control sheet 4 or the like.

DESCRIPTION OF SYMBOLS 1 Roll curtain 2 Daylighting sheet 3 Cloth 4 Light control sheet 6 Base material layer 7 Deflection layer 7a Incident surface 7b Outgoing surface 10 Groove 11 Base part 12 Louver part 12a First surface 12b Second surface 13 Adhesive layer 21 Roll mechanism 21A Shaft member 21B Frame member 21C Weight member 22 Chain 50 Projected transmittance measuring device 51 Light source 52 Transmission type screen 53 Imaging device 80 First evaluation device 81 Light opening 82 Dark box 83 Sample holding portion 84 Light source 85 Illuminance meter 100 Second evaluation device 101 Sample Holding unit 102 Light source 103 Optical alignment measuring device L1, L2 Straight line

Claims (7)

A deflecting layer having an incident surface and an exit surface facing each other, and deflecting light incident from the entrance surface to emit from the exit surface;
A light control sheet comprising: a sheet-like cloth laminated on the deflection layer.   The light control sheet according to claim 1, wherein the total light transmittance of the cloth is 40% or more and 80% or less.   The light control sheet according to claim 1 or 2, wherein the cloth includes any one of plant fibers, animal fibers, and chemical fibers, or at least two of them.   A curtain comprising the light control sheet according to claim 1. 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 and unfolded on the shaft member.   The curtain according to claim 5, wherein a weight member is provided at the other end of the light control sheet.   The curtain according to claim 5 or 6, wherein an outer diameter of the shaft member is 25 mm to 120 mm.

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