WO2016052560A1

WO2016052560A1 - Light control sheet, curtain provided with same, and method for producing light control sheet

Info

Publication number: WO2016052560A1
Application number: PCT/JP2015/077603
Authority: WO
Inventors: 明子北村; 雅幸関戸
Original assignee: 大日本印刷株式会社
Priority date: 2014-09-30
Filing date: 2015-09-29
Publication date: 2016-04-07
Also published as: JPWO2016052560A1; JP6704853B2

Abstract

The present invention addresses the problem of providing a light control sheet that exhibits suitable daylighting performance and ensures excellent design properties. A light control sheet according to this embodiment is provided with: a deflection layer (7) that has a light entrance surface and a light emission surface that face each other, and deflects light having entered from the light entrance surface (7a) and emits said light from the light emission surface (7b); and a color member (3) that is laminated on the deflection layer (7) and has a surface that develops a color. In a coordinate plane where the aperture ratio of the color member (3) is defined as x and the brightness of the surface of the color member (3) is defined as y, the aperture ratio and brightness of the color member 3 are set in a region R between a straight line L1 defined as y=-1.4137x+91.447 and a straight line L2 defined as y=-1.6000x+194.20.

Description

LIGHT CONTROL SHEET, CURTAIN HAVING THE SAME, AND LIGHT CONTROL SHEET MANUFACTURING METHOD

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

As such technology, there are, for example, a roll curtain (also called a roll screen) or a rail curtain that is installed so as to cover a window of a building or between indoor spaces. Common curtains are usually made from fabrics using various fabrics.

There are various types of such general 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). A curtain made from such a fabric can be given various colors and designs depending on the selection of the fabric, and thus can generally be said to have excellent design properties.

On the other hand, various curtains have been proposed with an emphasis on functionality. 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 and dazzling lowers the design of the curtain. For this reason, it is desired that such a tenn can ensure excellent design properties while sufficiently exhibiting the daylighting performance which is an original function.

The present invention has been made in consideration of such points, and can exhibit a suitable daylighting performance and can ensure excellent design, a curtain including the light control sheet, and It aims at providing the manufacturing method of a light control sheet.

The present invention has an entrance surface and an exit surface opposite to the entrance surface, deflects light incident from the entrance surface and emits the light from the exit surface, and is laminated on the deflecting layer. In a coordinate plane in which the color member has an aperture ratio x [%] and the color member surface brightness is y, specified by y = −1.4137x + 91.447 A light control sheet in which the aperture ratio and lightness of the color member are set in a region between the straight line defined by y = −1.6000x + 194.20.

In the light control sheet, the color member may be any one of cloth, paper, colored plastic, and colored glass, or a combination of at least two of these.

In the light control sheet, the cloth may include any one of plant fibers, animal fibers, and chemical fibers, or at least two of these.

Further, the color member may be a colored layer formed in a pattern.

Further, in the light control sheet, the color developed on the surface of the color member may be a chromatic color, an achromatic color, or a combination of these chromatic and achromatic colors.

Further, in the light control sheet, the total light transmittance of the color member may be 40% or more and 80% or less.

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

The present invention also includes a deflecting layer that has an incident surface and an exit surface facing each other, deflects light incident from the incident surface and emits the light from the exit surface, and is laminated on the deflecting layer, and the surface has a color. A light control sheet comprising: a color member that expresses the color member, wherein an aperture ratio of the color member is x [%] and a brightness of the surface of the color member is y: The color member in which the aperture ratio and the brightness of the color member are set in a region between a straight line defined by 1.4137x + 91.447 and a straight line defined by y = −1.6000x + 194.20, And a step of laminating the selected color member on the deflection layer. A method for manufacturing a light control sheet.

ADVANTAGE OF THE INVENTION According to this invention, while being able to exhibit suitable lighting performance, the light control sheet which can ensure the outstanding designability, a curtain provided with the same, and the manufacturing method of a light control sheet 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 figure which showed the table | surface regarding the experiment example which measured the aperture ratio, the brightness, and the total light transmittance of the cloth. It is a schematic block diagram of an evaluation apparatus. The color member provided in the light control sheet has an aperture ratio of x [%] and the color member surface brightness is y, and the color member of this embodiment defined on the coordinate surface It is the figure which showed the area | region used as the reference | standard for setting an aperture ratio and a brightness. It is a fragmentary sectional view of the light control sheet explaining the modification of the light control sheet concerning an embodiment of the invention. It is a fragmentary sectional view of the light control sheet explaining other modification 1 of the light control sheet concerning an embodiment of the invention. It is a fragmentary sectional view of the light control sheet explaining other modification 2 of the light control sheet concerning an embodiment of the invention. It is a fragmentary sectional view of the light control sheet by other modification 1 of an embodiment of the invention. It is a fragmentary sectional view of the light control sheet by other modification 2 of an embodiment of the invention.

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 (roll screen) 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 and the vertical / horizontal dimension ratio, etc. are appropriately changed and exaggerated from those of the actual ones.

Also, in the present specification, the terms “sheet”, “film”, and “plate” are not distinguished from each other only based on the difference in names. 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 colored member 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.

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 unfoldable on a shaft member (not shown) of the roll mechanism 21.

(Configuration of light control sheet)
FIG. 2 shows cross sections of the daylighting sheet 2 and the color member 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. Further, the first surface 12a may have a shape that extends linearly as a whole, or may be formed in a polygonal line shape that protrudes downward in a longitudinal section along the thickness direction of the daylighting sheet 2.

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.

Further, as shown in FIG. 2, the color member 3 in the present embodiment is a member whose surface 3 a develops color, and is provided to ensure the design of the light control sheet 4. The surface 3a is a surface facing in the direction opposite to the daylighting sheet 2 side. On the other hand, the color member 3 has translucency. This is because the daylighting effect of the daylighting sheet 2 is lost when no light is transmitted. Note that the color that the surface 3 a of the color member 3 develops may be partially different on the sheet surface of the color member 3. In the present embodiment, such a color member 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, from the viewpoint of making the glare and glare caused by the deflection layer 7 inconspicuous, the color member 3 is preferably provided so as to cover the entire surface of the deflection layer 7, or the glare and glare are more enhanced. It is preferable that a single color member 3 is provided in a region that is easily sensed, 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 color member 3 from the light incident side to the light emission side. Has been. However, as shown in FIG. 6, as a modification of the present embodiment, the deflection layer 7, the base material layer 6, the adhesive layer 13, and the color member 3 are arranged in this order from the light incident side to the light emission side. Thus, the light control sheet 4 may be configured by laminating these elements. The cloth 3, the adhesive layer 13, the deflecting layer 7, and the base layer 6 may be arranged in this order from the light incident side, or the cloth 3, the adhesive layer 13, the base layer 6, and the deflecting layer 7 may be arranged in this order. And the curtain 1 may be comprised from such a light-control sheet | seat 4. FIG.

The “color” expressed by the surface 3a of the color member 3 means a chromatic color, an achromatic color, or a combination of these chromatic and achromatic colors. In the present embodiment, “chromatic color” means a color in which a * and b * are not 0 in the color space of L *, a *, and b *, and “achromatic color” means , L *, a *, and b * are colors in which a * and b * are 0. Such L *, a *, and b * can be measured according to JIS Z 8781-4: 2013, and can be measured using, for example, SpectroEye manufactured by X-rite.

Specifically, “chromatic colors” include yellow, beige, pink, light blue, red, green, blue, etc., and whites with off-white, ivory, etc. where a * and b * are not 0 And grey are also included in chromatic colors. The “achromatic color” is white, gray, black or the like in which a * and b * are 0.

Here, in the present embodiment, such a color member 3 has y = − on the coordinate plane where the aperture ratio of the color member 3 is x [%] and the brightness of the surface of the color member 3 is y. The aperture ratio and brightness are set in a region R between the straight line L1 defined by 1.4137x + 91.447 and the straight line L2 defined by y = −1.6000x + 194.20. Has been. Specifically, FIG. 5 shows a coordinate plane in which the aperture ratio of the color member 3 is x [%], the brightness of the surface of the color member 3 is y, and the region R described above. Details of FIG. 5 will be described later. The color member 3 preferably has a total light transmittance of 40% or more and 80% or less.

Here, the aperture ratio means the ratio of the transparent portion of the color member 3 to the entire color member 3 when the color member 3 is viewed from the outside along the normal direction of the surface 3 a of the color member 3. To do. Here, the transparent part means a transparent part made of resin or glass or a part where no member is interposed, that is, a hole or the like. The aperture ratio can be measured using, for example, a digital microscope VH-7000 manufactured by Keyence Corporation. The value of brightness means the value of L * among L *, a *, and b * that can be measured according to JIS Z 8781-4: 2013. As described above, the brightness value can be measured using, for example, SpectroEye manufactured by X-rite. Further, the total light transmittance can be measured by a method based on JIS K 7361-1: 1997 using a haze meter (manufactured by Murakami Color Research Laboratory, product number: HM-150).

The material of the color member 3 is not particularly limited as long as the aperture ratio and the brightness are set in the region R described above.

For example, the material of the color member 3 can be selected from, for example, cloth, paper, colored plastic, colored glass, or a combination of at least two of these. Furthermore, the color member 3 is a concept including a colored layer formed in a pattern. The above-mentioned “cloth” is a sheet using fibers and may be woven or non-woven. As the cloth, any one of plant fiber, animal fiber, and chemical fiber, or a woven fabric, a knitted fabric, a lace, a felt, or a nonwoven fabric containing at least two of them can be used.

Plant fibers are cotton, hemp, etc., and animal fibers are silk, wool, alpaca, Angola, cashmere, mohair, etc. 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.

Also, typical examples of the above-mentioned “paper” include paper used as shoji paper, such as Japanese paper, but other paper, such as western paper, may be used. Note that the aperture ratio of paper or the like is generally 0%, but can be suitably used if the brightness is set in the region R described above. Further, the above-mentioned “colored plastic” means a plate-like plastic material that is colored in whole or in part and has translucency. Such a colored plastic can be suitably used as the color member 3 as long as lightness is set in the above-described region R even when the color is applied as a whole and the aperture ratio is 0%. Further, even if such colored plastic is colored as a whole, a hole penetrating in the normal direction is formed, and the aperture ratio and the brightness of the colored portion are in the region R described above. If set, it can be suitably used as the color member 3. In addition, such a colored plastic is partially colored, and when the portion other than the colored portion is transparent, the aperture ratio which is the ratio of the transparent portion to the whole and the brightness of the colored portion are the above-described regions. If it is set in R, it can be suitably used as the color member 3.

Further, the above-mentioned “colored glass” means a plate-like glass which is colored entirely or partially and has translucency. Even if such a colored glass is colored as a whole and the aperture ratio is 0%, it can be suitably used as the color member 3 as long as the brightness is set in the region R described above. In addition, such a colored glass forms a hole penetrating in the normal direction even when it is entirely colored, and the aperture ratio and the brightness of the colored portion are set in the above-described region R. If it is done, it can be suitably used as the color member 3. In addition, when such colored glass is partially colored and the portion other than the colored portion is transparent, the aperture ratio which is the ratio of the transparent portion to the whole and the brightness of the colored portion are the above-described regions. If it is set in R, it can be suitably used as the color member 3. In addition, when the color member 3 is colored glass in the light control sheet 4, it is difficult to use it for the roll curtain as in the present embodiment. However, it can be suitably used as a window glass or the like.

Further, the above-mentioned “colored layer formed in a pattern” is laminated on the deflection layer 7 via an intermediate layer (for example, the base material layer 6 in the configuration shown in FIG. 6) or on the deflection layer 7. It means a layer that is directly stacked and formed in a pattern. “Formed in a pattern” means, for example, formed by laminating a plurality of colored halftone dots made of a colored layer forming material. When a colored layer is formed from a plurality of halftone dots, the colored layer may be formed simply by representing a color by a set of a plurality of halftone dots, or a figure, a design, a picture, a character, an image, It may be formed to represent letters, marks, numbers, etc.

When the color member 3 is a colored layer, the adhesive layer 13 shown in FIG. Other modified examples 1 and 2 of the light control sheet 4 according to the present embodiment in the case where the color member 3 is a colored layer are shown in FIGS. 7A and 7B.

As shown in FIG. 7A, when the base material layer 6 and the deflecting layer 7 are laminated from the light incident side to the light emitting side, the light control sheet 4 is a colored member 3 that is a colored layer. May be directly laminated on the deflecting layer 7. In this case, the color member 3 that is a colored layer may be formed, for example, by directly printing a colored layer forming material on the deflection layer 7. The color member 3 that is a colored layer may be formed by forming a colored layer on a transfer substrate and then transferring the colored layer formed on the substrate to the deflection layer 7. Here, when the color member 3 is a colored layer, since the colored layer includes a colored portion and an opening portion, the opening ratio is a ratio of the opening portion to the entire colored layer.

Further, as shown in FIG. 7B, the light control sheet 4 is a color that is a colored layer when the deflection layer 7 and the base material layer 6 are laminated from the light incident side to the light emission side. The member 3 may be formed by being directly laminated on the base material layer 6. In this case, the color member 3 that is a colored layer is formed by, for example, printing a colored layer forming material directly on a transparent base material layer 6 such as plastic or glass and then bonding the material to the deflection layer 7. May be. In this case, before adhering to the deflection layer 7, the color member 3 is adjusted by adjusting the ratio of the transparent portion of the base material layer 6 where the color member 3 does not exist in the integrated body of the base material layer 6 and the color member 3. The aperture ratio can be adjusted.

(About the aperture ratio and brightness of the color member)
As a result of extensive research, the present inventor has combined the daylighting sheet 2 with the color member 3 in which the aperture ratio and the brightness are set in the region R shown in FIG. In this case, it has been found that 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. The present invention is embodied based on the knowledge. Hereinafter, the usefulness of the present invention including the color member 3 in which the aperture ratio and the brightness are set in the region R described above will be described in detail.

Conventionally, a roll curtain provided with a deflection layer for obtaining a daylighting effect has a glare and glare peculiar to a material such as a resin. 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 member that can favorably obtain the daylighting effect. Specifically, paying attention to the aperture ratio, brightness, and total light transmittance of the member, various experiments were conducted to investigate the relationship between these and the daylighting effect.

An example of such an experiment is shown in FIG. In the experimental example shown in FIG. 3, nine types of fabrics with the same design (pattern) and different colors are prepared as those that can be used for the color member 3, and the aperture ratio, brightness, and total light transmittance of each fabric are measured. did. Specifically, the nine types of fabric colors prepared here are white, yellow, beige, pink, light blue, red, green, blue, and black.

The opening ratio of the fabric is the ratio of the transparent portion of the fabric to the entire fabric when the fabric is viewed from the outside along the normal direction of the surface of the fabric. The transparent portion means a transparent portion made of resin or glass or a portion where no member is interposed, that is, a hole or the like. Since the member used in this experimental example is a cloth, the transparent portion corresponds to a hole in the cloth. In this experimental example, the aperture ratio of each fabric was obtained by measuring the ratio of the area of the hole per 1 cm ^{2 of} fabric using a digital microscope (VH-7000 manufactured by Keyence Corporation).

The lightness of the fabric is the value of L * among L *, a *, and b * that can be measured in accordance with JIS Z 8781-4: 2013. In this experimental example, the brightness of each fabric was measured using SpectroEye manufactured by X-rite. Here, in this experimental example, in order to improve the accuracy of the brightness value, as an example, the measurement was performed by stacking 20 pieces of the same color fabric on a white plate. This is a measure for suppressing the influence of the opening (hole) in the fabric on the brightness.

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 of the fabric can be determined according to JIS K 7361-1: 1997. In this experimental example, the total light transmittance of each fabric was measured three times using a haze meter HM-150 manufactured by Murakami Color Research Institute in accordance with JIS K 7361-1: 1997, and the average value was calculated. It was set as the total light transmittance in this experiment example.

And this inventor obtained the aperture ratio, the brightness, and the total light transmittance of each cloth as shown in FIG. Then, each of the fabrics was combined with the daylighting sheet 2 that emits the incident light so as to jump up as described above, and the lighting effect was evaluated and the design property was evaluated.

The evaluation of the daylighting effect was performed by the evaluation apparatus 100 schematically shown in FIG. The 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 measuring device 103 that is arranged on the other side of the sample holding unit 101. Have.

In this evaluation apparatus 100, as shown in FIG. 4, the sample holding unit 101 is in the form of a sheet at the position of the origin in the space defined by the X axis, the Y axis, and the Z axis defined to be orthogonal to each other. The sample is held so that the planar direction of the film-like or plate-like sample 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 101, DOLAN-JENNER made metal halide fiber light source MH-100 was used. The light source 101 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 enter the sample held at the origin position while changing the incident angle. It is possible. Specifically, the light source 101 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 101 or the vicinity thereof, and the position (0 on the X axis). 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, a substantially colorless and transparent blue plate glass (manufactured by Central Glass Co., Ltd., thickness 2.9 mm) is held in the sample holding unit 101, and the light source 102 is set at 0 to 70 degrees as shown in FIG. The incident angle of light was set by moving it in 10 degree increments between degrees, and light was incident on the soda-lime glass. Then, for each incident angle, the amount of light transmitted through the soda glass toward the upper half that is one portion in the Z-axis direction, that is, the direction indicated by 90 to 180 degrees 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 a rate. Thereafter, a combination of the fabric according to the experimental example and the daylighting sheet 2 is bonded to the blue plate glass and held in the sample holding unit 101, and the light is irradiated under the same conditions as the light incident on the blue plate glass described above. Incident. Then, the upper half transmittance [%] is measured for each of the eight incident directions set in increments of 10 degrees between 0 degrees and 70 degrees in the same manner as in the case of the above-described blue plate glass. All of the eight upper half transmittances obtained were added to calculate the experimental transmittance, which was compared with the reference transmittance.

And, when the experimental transmittance was larger than the reference transmittance, it was evaluated that the lighting effect was obtained. This is because if the experimental transmittance is larger than the reference transmittance, the amount of incident light jumping up on the exit side is larger than that of mere soda glass, so that it can be evaluated that the lighting effect is exhibited.

And when this inventor examined the evaluation result of the lighting effect, it discovered that the total light transmittance was 40% or more as a feature common to what the experimental transmittance becomes larger than a reference transmittance, It was found that when the total light transmittance is 40% or more, the experimental transmittance is larger than the reference transmittance, and it can be evaluated that the lighting effect can be obtained. On the other hand, it was found that the lighting effect could not be obtained for the fabric having a total light transmittance of less than 40%. Specifically, with respect to the dough whose total light transmittance of “red” shown in FIG. 3 is 17.1%, 25.03%, 38.97%, etc., the experimental transmittance of a sample using the dough Was less than 100% of the standard transmittance, and it could not be evaluated that the lighting effect was obtained.

On the other hand, the design property was evaluated 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 fabric was 80% or less, it was possible to evaluate that no glare or dazzling occurred. Conversely, for fabrics having a total light transmittance of greater than 80%, glare and glare occurred. Specifically, when a sample in which the total light transmittance of “white” shown in FIG. 3 is combined with the daylighting sheet 2 with the dough whose total light transmittance is 80.6%, 84.7%, etc. is observed, it is caused by the daylighting sheet A feeling of glare and dazzling occurred.

From the above examination, the present inventor exhibits suitable lighting performance when used in combination with the daylighting sheet 2 as the color member 3 if the total light transmittance of the fabric is 40% or more and 80% or less. It was found that it was possible to suppress glare and glare.

Then, the present inventor examined parameters that can more objectively specify the range where the total light transmittance of the fabric is 40% or more and 80% or less, and pay attention to the aperture ratio [%] and the brightness of the fabric. And this inventor discovered that even if the brightness was the same as shown in FIG. 3, the total light transmittance was changing according to the value of aperture ratio. For example, in the “red” fabric, the total light transmittance increases as the aperture ratio increases. If the aperture ratio becomes 55%, the total light transmittance is 40% or more, which is a desirable total light transmittance. The value is within the range of 80% or less. Moreover, even if the aperture ratio was the same, when the brightness was different, it was found that the total light transmittance was changed. This is considered to be because the ratios of transmission, absorption, reflection, and scattering differ depending on the brightness.

That is, what has been described above is that the total light transmittance can be adjusted by adjusting the aperture ratio and the brightness, and the total light transmittance can be adjusted to 40 by adjusting the aperture ratio and the brightness appropriately. It means that it can be flexibly adjusted in the range of not less than 80% and not more than 80%.

The inventors of the present invention examined the relationship between the aperture ratio and the brightness in which the total light transmittance is in the range of 40% to 80%. Here, FIG. 5 shows a graph in which the measurement results of the experimental example of FIG. 3 are plotted on a coordinate plane where the opening ratio of the fabric is x [%] and the brightness of the surface of the fabric is y. In FIG. 5, the total light transmittance corresponding to each plot is shown in parentheses for convenience of explanation. Here, the inventor of the present invention paid attention to a plot near 40%, which is the lower limit of the desirable total light transmittance, and a plot near 80%, which is the upper limit.

In FIG. 5, plots near the total light transmittance of 40% include “a plot corresponding to an aperture ratio of 16%, a lightness of 69.52, and a total light transmittance of 41.5”, “red fabric” "A plot corresponding to an aperture ratio of 40%, brightness 32.73, total light transmittance 38.97", "Plot corresponding to a black fabric aperture ratio 55%, brightness 14.02, total light transmittance 41.87" Can be mentioned. Here, the present inventor draws a line that linearly passes in the vicinity of these plots, and if the aperture ratio and brightness are set in the positive region of the line, the total light transmittance is 40% or more. It was inferred that Therefore, the straight line L1, that is, y = −1.4137x + 91.447 was specified on the graph based on the above three plots. And if the aperture ratio and the brightness were set in the area on the positive side of the straight line L1, it was concluded that the total light transmittance could be 40% or more.

On the other hand, in FIG. 5, plots near the total light transmittance of 80% include “a plot corresponding to an aperture ratio of 72%, a lightness of 77.47, and a total light transmittance of 77.4”, “a white fabric”. , A plot corresponding to an aperture ratio of 67%, brightness of 88.64, and total light transmittance of 80.6 ”. Here, the present inventor draws a line that linearly passes in the vicinity of these plots, and if the aperture ratio and lightness are set in the negative region of the line, the total light transmittance is 80% or less. It was inferred that Therefore, the straight line L2, that is, y = −1.6000x + 194.20, was identified on the graph based on the above two plots. Then, when the aperture ratio and the brightness are set in the negative region of the straight line L2, it has been concluded that the total light transmittance can be 80% or less.

In fact, of the measurement results shown in FIG. 3, the total light transmittance of 40% or more and 80% or less is located in the region R between the straight line L1 and the straight line L2. confirmed. Further, among the measurement results shown in FIG. 3, the lightness of the aperture ratio of the total light transmittance that is not 40% or more and 80% or less becomes the region R between the straight line L1 and the straight line L2. Alternatively, when the aperture ratio is adjusted, the total light transmittance is 40% or more and 80% or less. On the other hand, when the above-described lighting effect is evaluated, the experimental transmittance becomes larger than the reference transmittance, and the lighting effect is increased. It was also confirmed that

From this result, in the present embodiment, the color member 3 has a coordinate plane in which the aperture ratio of the color member 3 is x [%] and the brightness of the surface of the color member 3 is y. A configuration is adopted in which the aperture ratio and the brightness are set in a region R between the straight line L1 defined by 4137x + 91.447 and the straight line L2 defined by y = −1.6000x + 194.20. For example, when this color member 3 is combined with the daylighting sheet 2 and the light control sheet 4 is configured, it is possible to exhibit suitable daylighting performance and to suppress glare and glare. Was confirmed. From the above, the light control sheet 4 of the present embodiment or the curtain 1 including the light control sheet 4 can exhibit suitable lighting performance and can ensure excellent design. .

(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, the color member 3 is selected. Here, as described above, the color member 3 has y = −1.4137x + 91.447 in the coordinate plane where the aperture ratio of the color member 3 is x [%] and the brightness of the surface of the color member 3 is y. A region whose aperture ratio and brightness are set in a region R between the defined straight line L1 and the straight line L2 defined by y = −1.6000x + 194.20 is selected. Here, only by adjusting the aperture ratio and brightness of the color member 3, it is possible to select the color member 3 that can exhibit suitable daylighting performance and suppress glare and glare. 3 can be easily selected. Moreover, if the aperture ratio and the brightness of the color member 3 are adjusted, the design relating to the color, the design, and the material can be flexibly selected, so that excellent design properties can be ensured.

Next, a step of laminating the selected color member 3 on the daylighting sheet 2 is performed. Here, the color member 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 formed into a sheet or a film and disposed between the daylighting sheet 2 and the color member 3, and after applying pressure to extrude air, the daylighting sheet 2 and the color member 3 are heated. 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 7b, and a color member 3 that is laminated with the deflecting layer 7 and whose surface expresses color are provided. Then, on the coordinate plane where the aperture ratio of the color member 3 is x [%] and the brightness of the surface of the color member 3 is y, a straight line L1 defined by y = −1.4137x + 91.447 and y = −1 The aperture ratio and the brightness of the color member 3 are set in a region R between the straight line L2 defined by .6000x + 194.20.

According to this, if the aperture ratio and the brightness of the color member 3 are set in the above-described region R, it is possible to exhibit suitable lighting performance and to suppress glare and glare. . In addition, if the aperture ratio and the brightness of the color member 3 are set in the region R, the design of the color member 3 is not restricted. For this reason, the selection range of the color member 3 is widened, and the degree of freedom of design selection regarding the color, design, and material can be improved. Thereby, according to this Embodiment, while being able to demonstrate suitable lighting performance, the outstanding design property can be ensured.

Further, the color member 3 includes an information display portion, and may have a function as an advertising medium, for example. Thus, even if the information display portion is included in the color member 3, if the aperture ratio and the brightness of the color member 3 are set in the above-described region R, it is possible to exhibit suitable lighting performance. It is possible to suppress glare and glare. More specifically, the color member 3 is made of cloth, paper, or flexible colored plastic, and an information display portion is provided on the color member 3 so as to function as an advertising medium, and the light control is performed in combination with the daylighting sheet 2. The sheet 4 may be configured, and the light control sheet 4 may be used as a window film attached to the window glass. Further, such a light control sheet 4 may constitute a roll curtain. Further, the color member 3 is used as a shoji paper, an information display portion is further provided on the color member 3, and the light control sheet 4 is configured in combination with the daylighting sheet 2, and the light control sheet 4 is used to construct the shoji. Good. Further, the light control sheet 4 may be configured in combination with the daylighting sheet 2 by providing the color member 3 as a blind and further providing an information display portion on the color member 3.

Although the embodiment of the present invention has been described above, the present invention is not limited to the above-described 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, an example in which the light control sheet 4 is applied to a window film, a shoji, and a blind is described. The control sheet 4 may be a rail curtain (also simply called a curtain in a narrow sense) or a shade curtain. For example, the rail curtain provided with the light control sheet 4 has a plurality of hooks arranged on one end side thereof for connecting to the curtain rail, and is fixed to the curtain rail arranged at the upper part of the window or indoor space with the hooks. (Supported) and opened and closed along the curtain rail. Moreover, the shade curtain provided with the light control sheet 4 can be configured to be foldable and unfoldable by providing a folding mechanism. Furthermore, the present invention can be applied to blinds, accordion curtains, and the like. Further, it goes without saying that the light control sheet 4 can be used by being attached to a window glass or the like without exhibiting the advertisement display function as described above.

As described above, the cross-sectional structure of the daylighting sheet 2 is not limited to the structure of the above-described embodiment as long as the incident light can be jumped up. A light control sheet 4 according to yet another modification 1 will be described with reference to FIG. FIG. 8 shows cross sections of the daylighting sheet 2 and the cloth 3 in the light control sheet 4. As shown in FIG. 8, the daylighting sheet 2 in the modified example has a base material layer 6 having an opposing main surface and a deflection layer 7 laminated on one main surface of the base material layer 6. . 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 deflecting layer 7 has an incident surface 7a and an exit surface 7b that face each other, and deflects light incident from the entrance surface 7a at the interface between the projection 14 and the gap 15 and emits it from the exit surface 7b. is there. 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.

8 has a plurality of protrusions 14 that are spaced apart from each other along the incident surface 7a, and gaps 15 that are formed between the protrusions 14. For the projection 14, for example, an optical element such as an optical prism body mainly composed of resin or glass can be used. In addition, the code | symbol P in FIG. 8 has shown the width | variety in the sheet | seat surface direction of the projection part 14, and the code | symbol H has shown the height in the sheet | seat normal line direction of the projection part 14. FIG. Further, the gap 15 can be filled with air, gas, or the like. A larger refractive index difference is preferable because more external light can be totally reflected at the interface between the protrusion 14 and the gap 15. For example, when air having a refractive index of 1.0 is present in the gap 15, a sufficiently large refractive index difference can be obtained in relation to the refractive index of the protrusion 14 mainly composed of resin or glass. The protrusion 14 has a first surface 14a and a second surface 14b extending in a direction intersecting the incident surface 7a. The protrusion 14 changes the traveling direction of light based on the refractive index difference between the gap 14 and the protrusion 15 at least on the second surface 14 b of the interface with the gap 15. FIG. 8 shows an example of an asymmetric structure in which all of the illustrated protrusions 15 have the first surface 14a and the second surface 14b having different shapes, but the shapes of the first surface 14a and the second surface 14b are the same. It may be a symmetric structure. As shown by the arrows in FIG. 8, such a deflection layer 7 deflects the light incident from the incident surface 7a so as to jump up obliquely upward and emits the light from the output surface 7b. In this modification, the emission surface 7b means an imaginary surface that connects the end surface on the opposite side to the incident surface 7a side of the protrusion 14 or between the adjacent end surfaces in the sheet surface direction.

FIG. 9 is a partial cross-sectional view of the light control sheet 4 according to still another modification 2. In the daylighting sheet 2 of the modification shown in FIG. 9, the first surface 12 a of the louver portion 12 is formed in a polygonal line shape that protrudes downward in a longitudinal section along the thickness direction of the daylighting sheet 2. Specifically, the first surface 12a has two planar portions, that is, an incident side surface portion 12a1 positioned on the incident surface side and an output side surface portion 12a2 positioned on the output surface side. The angle formed by the incident side surface portion 12a1 with respect to the normal direction of the daylighting sheet 2 is larger than the angle formed by the output side surface portion 12a2 with respect to the normal direction. On the other hand, the second surface 12b is formed so as to extend linearly in a cross-sectional view.

In FIG. 9, symbol θ _U1 indicates an angle formed by the incident side surface portion 12 a 1 with the normal direction of the daylighting sheet 2, and symbol θ _U2 indicates an angle formed by the exit side surface portion 12 a 2 with the normal direction of the daylighting sheet 2. Show. Here, a relationship of θ _U1 > θ _U2 is established. Reference sign θ _D indicates an angle formed by the second surface 12 b with the normal direction of the daylighting sheet 2. Incidentally, theta _U1 and theta _U2 represent side inclined upward positive with respect to the normal direction of the lighting sheet 2, theta _D represents a side inclined downwardly positive with respect to the normal direction of the lighting sheet 2 . Furthermore, the code | symbol D has shown the length dimension in the normal line direction of the lighting sheet 2 of the louver part 12. FIG. Further, reference symbol P denotes a sheet surface direction between an incident surface side end portion of the incident side surface portion 12a1 and an incident surface side end portion of another incident side surface portion 12a1 adjacent in the upper or lower direction (sheet surface direction). Shows the distance.

In the daylighting sheet 2 shown in FIG. 9, the base part 11 can be formed from the following materials as an example.
・ A-BPEF (Shin Nakamura Chemical Co., Ltd. bifunctional acrylate)
・ Light acrylate POB-A (Kyoeisha Chemical Co., Ltd. monofunctional acrylate)
・ Light acrylate PO-A (Monofunctional acrylate manufactured by Kyoeisha Chemical Co., Ltd.)
・ Iragacure184 (Photopolymerization initiator manufactured by BASF)
・ Phosphate ester of tetradecanol ethylene oxide (10 mol) adduct

On the other hand, the louver part 12 can be formed from the following materials as an example.
・ EBECRYL230 (urethane acrylate manufactured by Daicel Ornex Co., Ltd.)
・ SR610 (bifunctional acrylate manufactured by Sartomer)
・ SR256 (Monofunctional acrylate manufactured by Sartomer)
・ Iragacure184 (Photopolymerization initiator manufactured by BASF)

An example of a manufacturing method when the daylighting sheet 2 shown in FIG. 9 is actually manufactured from the above-described materials will be described below. In the manufacturing method according to this example, first, a material (weight) for forming a liquid base portion 11 on one surface of a continuous belt-like transparent biaxially stretched polyethylene terephthalate (PET) film (Toyobo A4300, thickness: 100 μm). The ratio A-BPEF: POB-A: PO-A: Irgacure184: phosphate ester = 50: 30: 20: 3: 0.03) was applied and cured. The thickness of the material for forming the base part 11 after curing was 120 μm.
Next, convex portions (θ _U1 = 11.4 °, θ _U2 = 0 °, θ _D = 2 °, D = 165 μm, P = 59 μm) as shown in FIG. 9, that is, a shape corresponding to the contour shape of the louver portion 12 However, the roll-shaped metal mold | die formed in parallel was prepared. This roll-shaped mold was disposed so as to face the PET film through the material for forming the base portion 11, and the material for forming the base portion 11 was crosslinked and cured by irradiating ultraviolet rays with a mercury lamp. . Then, the roll-shaped metal mold | die was peeled from the material for formation of the said base part 11, and the base part 11 (light transmissive part) which has a some groove part was obtained. The refractive index of the obtained base part 11 was 1.602.
Next, a material for forming the liquid louver portion 12 (weight ratio EBECRYL230: SR610: SR256: Irgracure184 = 30: 30: 40: 3) is applied to the side of the base portion 11 where the groove portion is formed. The material for forming the louver portion 12 was filled only in the groove portion of the base portion 11 by squeegeeing using an iron doctor blade. Thereafter, ultraviolet rays were irradiated from a mercury lamp to crosslink and cure the material for forming the louver part 12 to obtain a louver part 12 (light control part). The obtained louver part 12 had a refractive index of 1.474. In this way, the daylighting sheet 2 shown in FIG. 9 can be obtained.

DESCRIPTION OF SYMBOLS 1 Roll curtain 2 Daylighting sheet 3 Color member 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 22 Chain L1, L2 straight line

Claims

A deflecting layer having an incident surface and an exit surface facing the entrance surface, and deflecting light incident from the incident surface to emit from the exit surface;
A color member laminated on the deflection layer, the surface of which expresses color; and
In the coordinate plane where the aperture ratio of the color member is x [%], and the brightness of the surface of the color member is y,
a straight line defined by y = −1.4137x + 91.447,
A light control sheet in which an aperture ratio and brightness of the color member are set in a region between a straight line defined by y = −1.6000x + 194.20.
The light control sheet according to claim 1, wherein the color member is any one of cloth, paper, colored plastic, and colored glass, or a combination of at least two of them.
The light control sheet according to claim 2, wherein the cloth includes any one of plant fibers, animal fibers, and chemical fibers, or at least two of these.
The light control sheet according to claim 1, wherein the color member is a colored layer formed in a pattern.
The light control sheet according to any one of claims 1 to 4, wherein a color developed on a surface of the color member is a chromatic color, an achromatic color, or a combination of the chromatic color and the achromatic color.
The light control sheet according to any one of claims 1 to 5, wherein the total light transmittance of the color member is 40% or more and 80% or less.
A curtain comprising the light control sheet according to any one of claims 1 to 6.
A deflecting layer that has an incident surface and an exit surface facing each other, deflects light incident from the incident surface and emits the light from the exit surface, and a color member that is stacked on the deflecting layer and that expresses color on the surface. A method of manufacturing a light control sheet comprising:
In the coordinate plane where the aperture ratio of the color member is x [%], and the brightness of the surface of the color member is y,
a straight line defined by y = −1.4137x + 91.447,
selecting the color member in which the aperture ratio and brightness of the color member are set in a region between the straight line defined by y = −1.6000x + 194.20;
Laminating the selected color member on the deflection layer;
A method for manufacturing a light control sheet.