JP2015161811A - Light control member, roll screen, daylighting sheet, and window with light control layer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light control member, etc., capable of exhibiting both illuminance improvement and antidazzle function using a daylighting function.SOLUTION: The light control member has a high refractive index layer 2 and a low refractive index layer 3, the high refractive index and low refractive index layers being arranged between an incidence surface 5 and an emission surface 6 so that a different refractive index interface, which is the interface of the high refractive index and low refractive index layers, or its extension face intersects the emission and incidence surfaces, and has a first area 1A disposed on one side parallel to the emission and incidence surfaces and a second area 2B on the other side. In the first area, a total reflection interface F, which is a different refractive index interface f having the high refractive index layer on one side, has a low emission angle interface F1 in which an angle θ1 on the low refractive index layer side forms an acute angle relative to the incidence surface. In the second area, the total reflection interface has a high emission angle interface F2 in which an angle θ2 on the low refractive index layer side forms an obtuse angle relative to the incidence surface.

Description

  The present invention relates to a light control member that takes in incident light.

In recent years, as environmental problems such as global warming become more serious, the development of light control members that can adjust the absorption, polarization, reflection, transmission, etc. of external light has been promoted for the purpose of energy saving and CO ₂ reduction. ing.

  For example, by providing a light control member on a window glass of a house, an automobile, etc., light that enters the room through a window glass from a light source such as the sun is deflected to the ceiling side, and the deflected light is used as indirect lighting in the room Can be used. By using such a daylighting function to improve indoor illuminance, it is expected to reduce power consumption and carbon dioxide consumption.

  As such a light control member, Patent Document 1 discloses a daylighting sheet including a deflection layer in which a plurality of unit prisms having a desired shape are arranged. In this method, one of the surfaces constituting the unit prism is used as a deflecting surface, so that light incident on the deflecting surface is deflected to a desired angle and jumped to the ceiling side.

  Patent Document 2 discloses a daylighting sheet in which a concave groove on the surface of a transparent sheet material is filled with a filler. This is because the concave groove is filled with a filler and the groove interface is used as a reflection surface, and the angle of the reflection surface is defined according to the shape of the groove, thereby deflecting the light incident on the reflection surface to a desired angle. To jump to the ceiling side.

JP2013-15569A JP 2012-255951 A

However, when the daylighting sheets disclosed in Patent Documents 1 and 2 are used at a position lower than the line of sight of a person in the room, the deflected light reaches the eyes of the person, and the person perceives that the person is dazzling. There is a problem of feeling uncomfortable. For this reason, the light control member is required to have not only a daylighting function by deflection of light but also an antiglare function.
Here, in the daylighting sheets disclosed in Patent Documents 1 and 2, it is also conceivable to change the angles of the deflection surface and the reflection surface in a direction in which light does not reach the human eye. However, since there is a limit to the angle at which light can be deflected, there is a problem that the range in which the antiglare function can be exhibited is limited. In addition, when light is deflected in a direction that does not reach the human eye, an anti-glare effect can be obtained, but depending on the light deflection angle, the emitted light cannot travel far and the illuminance cannot be improved over a wide area. There is.

  The present invention has been made in view of the above circumstances, and includes a light control member, a roll screen, a daylighting sheet, and a light control layer capable of exhibiting both an illuminance improvement utilizing a daylighting function and an antiglare function. The main purpose is to provide windows.

  In order to solve the above problems, the present invention has a high refractive index layer and a low refractive index layer having a refractive index lower than that of the high refractive index layer, and the high refractive index layer and the low refractive index layer are made of light. Between the high refractive index layer and the low refractive index between an incident surface that is a surface on which light is incident and an output surface that is a surface on which the light is emitted and faces the incident surface One side in a direction parallel to the incident surface and the exit surface, wherein the different refractive index interface, which is the interface of the layers, or an extended surface of the different index interface intersects the exit surface and the entrance surface. A light control member having at least a first region disposed on the other side and a second region disposed on the other side in a direction parallel to the incident surface and the exit surface. A total reflection interface which is the different refractive index interface where the high refractive index layer is located on the side of The low-refractive-index layer side has an acute-angle interface formed with an acute angle with respect to the incident surface. In the second region, the total reflection interface is There is provided a light control member having a high emission angle interface formed so that the angle on the low refractive index layer side is an obtuse angle.

According to the present invention, in the first region, the low reflection angle interface formed so that the total reflection interface among the different refractive index interfaces has an acute angle with respect to the incident surface on the low refractive index layer side. By having it, the light deflected so that the emission angle becomes smaller than the incident angle is emitted. As a result, it is possible to make the emitted light travel far and to prevent direct light from reaching the human eye while improving the illuminance over a wide range.
On the other hand, in the second region, the total reflection interface has a high exit angle interface formed so that the angle on the low refractive index layer side with respect to the entrance surface is an obtuse angle, so that the exit angle is the incident angle. The light deflected so as to be larger than that is emitted. As a result, the emitted light can be jumped up in the direction near the light control member, and the light to the human eye can be prevented from reaching directly while improving the illuminance near the light control member.
Thus, by changing the angle at which light is deflected for each of the above regions, it is possible to exhibit both an illuminance improvement utilizing a daylighting function and an antiglare function.

In the above-described invention, the light transmitting portion made of a transparent resin and the filling formed by filling a material having a refractive index different from that of the light transmitting portion into the plurality of grooves formed on one surface of the light transmitting portion. It is preferable that one of the filling layer and the light transmission portion located between the filling layers has a high refractive index layer and the other is the low refractive index layer.
In the above case, the filling layer is a low refractive index layer, the light transmission portion located between the filling layers is a high refractive index layer, and in the first region, the groove is an opening on the incident surface side. In the second region, it is preferable that the groove has an opening on the exit surface side. The light control member having the above structure can be formed into a sheet shape, and light can easily enter from the high refractive index layer to the low refractive index layer, so that more light can be totally reflected. Because. Further, by having the above structure, the light deflected in the first region can travel farther, while the light deflected in the second region jumps up in a direction closer to the top. Because you can.

  In the said invention, it is preferable that the said total reflection interface is a multistep shape which has two or more surfaces from which an angle differs with the said incident surface. This is because light incident at various incident angles can be deflected and emitted at a desired emission angle. In addition, incident light can be repeatedly reflected and deflected in each region, and the light emission angle can be adjusted.

  Further, the present invention is a roll screen having at least a screen substrate, an adhesive layer disposed on one surface of the screen substrate, and a light control member disposed on the adhesive layer, wherein the light control member Has a high refractive index layer and a low refractive index layer having a refractive index lower than that of the high refractive index layer, and the high refractive index layer and the low refractive index layer are incident surfaces on which light is incident. And a different refractive index interface that is an interface between the high refractive index layer and the low refractive index layer between the light exit surface and the exit surface that is a surface facing the entrance surface, Alternatively, an extension surface of the different refractive index interface is disposed so as to intersect the exit surface and the entrance surface, and the first region is disposed on one side in a direction parallel to the entrance surface and the exit surface, and The other side in the direction parallel to the entrance surface and the exit surface A total reflection interface, which is the different refractive index interface in which the high refractive index layer is located on the one side, with respect to the incident surface. The low-refractive-index layer side has a low emission angle interface formed so that the angle on the low-refractive-index layer side is an acute angle, and in the second region, the total reflection interface is on the low-refractive-index layer side with respect to the incident surface. There is provided a roll screen characterized by having a high exit angle interface formed so that the angle is an obtuse angle.

  According to the present invention, since the above-mentioned light control member is provided on the surface of the screen base material, the deflection angle of light can be changed for each region, and both the illuminance improvement using the daylighting function and the anti-glare function are provided. It becomes a roll screen capable of exhibiting.

  Further, the present invention is a daylighting sheet having at least a base material and a light control member disposed on one surface of the base material, wherein the light control member includes a high refractive index layer and the high refractive index layer. A low refractive index layer having a low refractive index, wherein the high refractive index layer and the low refractive index layer are an incident surface which is a surface on which light is incident, and a surface on which the light is emitted, and Between the exit surface which is a surface facing the entrance surface, a different refractive index interface which is an interface between the high refractive index layer and the low refractive index layer, or an extended surface of the different refractive index interface is the exit surface and A first region disposed so as to intersect the incident surface and disposed on one side in a direction parallel to the incident surface and the exit surface; and the other side in a direction parallel to the incident surface and the exit surface. At least a second region arranged in the first region In the region, the total reflection interface which is the different refractive index interface where the high refractive index layer is located on the one side is formed so that the angle on the low refractive index layer side is an acute angle with respect to the incident surface. In the second region, the total reflection interface has a high output angle interface formed so that the angle on the low refractive index layer side is an obtuse angle with respect to the incident surface. A daylighting sheet is provided.

  According to the present invention, since the above-described light control member is provided on the surface of the base material, the deflection angle of light can be changed for each region, and both the illuminance improvement using the daylighting function and the antiglare function can be achieved. It becomes a daylighting sheet that can be exhibited.

  Further, the present invention is a window with a light control layer having at least a window material, an adhesive layer disposed on one surface of the window material, and a light control layer disposed on the adhesive layer, wherein the light control The layer has a high refractive index layer and a low refractive index layer whose refractive index is lower than that of the high refractive index layer, and the high refractive index layer and the low refractive index layer are incident surfaces on which light is incident. A different refractive index interface, which is an interface between the high refractive index layer and the low refractive index layer, between the surface and the exit surface that is the surface on which the light exits and faces the entrance surface Or an extended surface of the different refractive index interface is disposed so as to intersect the exit surface and the entrance surface, and a first region disposed on one side in a direction parallel to the entrance surface and the exit surface; The second region disposed on the other side in the direction parallel to the entrance surface and the exit surface is reduced. In the first region, the total reflection interface, which is the different refractive index interface where the high refractive index layer is located on one side, has the low refractive index layer with respect to the incident surface. A low emission angle interface formed so that the angle on the side is an acute angle, and in the second region, the total reflection interface has an obtuse angle on the low refractive index layer side with respect to the incident surface. There is provided a window with a light control layer characterized by having a high emission angle interface formed as described above.

  According to the present invention, the light control layer disposed on one surface of the window member has the same structure as that of the above-described light control member. Therefore, the light deflection angle can be changed for each region, and the lighting is performed. It becomes possible to exhibit both the illuminance improvement using the function and the anti-glare function.

  The light control member of the present invention is disposed on one side in a direction parallel to the incident surface and the emission surface, and has a first region having a low emission angle interface where the light emission angle is smaller than the incident angle, and the other side. By providing two regions, the second region having a high exit angle interface where the exit angle is larger than the incident angle, both the illuminance improvement utilizing the daylighting function and the anti-glare function can be exhibited. There is an effect of being able to.

It is the schematic perspective view and sectional drawing which show an example of the light control member of this invention. It is explanatory drawing explaining the advance of the light in each area | region of a 1st area | region and a 2nd area | region. It is a schematic sectional drawing which shows an example of the total reflection interface in a 1st area | region. It is explanatory drawing explaining the advance of the light in a 1st area | region. It is a schematic sectional drawing which shows the other example of the light control member of this invention. It is a schematic sectional drawing which shows an example of the shape of a groove part. It is a schematic sectional drawing which shows the other example of the light control member of this invention. It is the schematic perspective view and sectional drawing which show an example of the roll screen of this invention. It is a schematic sectional drawing which shows an example of the lighting sheet of this invention. It is a schematic sectional drawing which shows an example of the window with a light control layer of this invention. It is explanatory drawing explaining the louver type sheet | seat used by the Example and Comparative Examples 1-2, and the schematic sectional drawing of the sample for evaluation of an Example.

  Hereinafter, the light control member, roll screen, daylighting sheet, and window with a light control layer of the present invention will be described in detail.

A. Light Control Member First, the light control member of the present invention will be described. The light control member of the present invention has a high refractive index layer and a low refractive index layer having a refractive index lower than that of the high refractive index layer, and the high refractive index layer and the low refractive index layer are on the light incident side. Between the high refractive index layer and the low refractive index layer between the light incident surface and the light emitting surface, and the light emitting surface facing the light incident surface. A different refractive index interface or an extended surface of the different refractive index interface is disposed so as to intersect the exit surface and the entrance surface, and is disposed on one side in a direction parallel to the entrance surface and the exit surface. It has at least a first region and a second region disposed on the other side in a direction parallel to the incident surface and the exit surface, and the first region has the high refraction on the one side. The total reflection interface, which is the interface of the different refractive index where the refractive index layer is located, is A low emission angle interface formed so that the angle on the low refractive index layer side is an acute angle; and in the second region, the total reflection interface is closer to the low refractive index layer side than the incident surface. It has a high emission angle interface formed so that the angle becomes an obtuse angle.

The light control member of the present invention will be described with reference to the drawings. FIG. 1A is a schematic perspective view showing an example of the light control member of the present invention, and FIG. 1B is a view of the light control member that intersects the S direction of FIG. 1A, that is, the entrance surface and the exit surface. It is the schematic sectional drawing seen from the section of thickness direction.
In the following description, the cross section refers to a surface of the light control member viewed from the S direction in FIG.
As shown in FIG. 1, the light control member 10 of the present invention is an incident surface 5 which is a surface on which light L is incident, and a surface on the side where the light L is transmitted through the light control member 10 and emitted. In addition, at least the first region 1 </ b> A and the second region 1 </ b> B in which the high refractive index layer 2 and the low refractive index layer 3 are disposed are provided between the exit surface 6 that is a surface facing the incident surface 5. The first region 1A is disposed on one X side in the direction parallel to the incident surface 5 and the exit surface 6, and the second region 1B is disposed on the other Y side in the direction parallel to the incident surface 5 and the exit surface 6. Has been.
A different refractive index interface f that is an interface between the high refractive index layer 2 and the low refractive index layer 3 intersects the incident surface 5 and the outgoing surface 6, and in the first region 1 </ b> A, the high refractive index layer is located on the X side. 2 is the total reflection interface F because light is incident on the low refractive index layer 3 from the high refractive index layer 2. Further, in the first region 1A, the total reflection interface F is, the angle theta ₁ of the low refractive index layer 3 side has a low exit angle interface F1 formed to an acute angle to the plane of incidence 5.
On the other hand, also in the second region 1B, the different refractive index interface f where the high refractive index layer 2 is located on the one X side becomes the total reflection interface F, and the total reflection interface F is a low refractive index layer with respect to the incident surface 5. of 3-side angle theta ₂ is formed so as to be an obtuse angle with a high output angle interface F2.

In the present invention, the first region is a region disposed on one side of the light control member in a direction parallel to the entrance surface and the exit surface, and the second region is the entrance surface and the exit in the light control member. It is a region arranged on the other side in the direction parallel to the surface. Here, “one side” and “the other side” in the light control member are usually “upper side” and “lower side” when the light control member is used. That is, when the light control member of the present invention is used, the first region is usually an upper region disposed on the upper side of the light control member, while the second region is disposed on the lower side of the light control member. It becomes the lower area. The reason why each region is arranged in this way will be described later in detail.
In the following description, one side may be referred to as “upper side” or “upper side”, and the other side may be referred to as “lower side” or “lower side”. Further, the first region and the second region may be referred to as an upper side region and a lower side region.

In the present invention, the total reflection interface is an interface where the high refractive index layer is located on one side in the direction parallel to the entrance surface and the exit surface among the different refractive index interfaces, that is, the upper side of the light control member in use. The interface where the high refractive index layer is located. Further, the total reflection interface refers to an interface that receives light when the light proceeds from the high refractive index layer to the low refractive index layer in the light control member in use.
In the present invention, the low emission angle interface is a surface formed so that the angle on the low refractive index layer side is an acute angle with respect to the incident surface in the total reflection interface, and the high output angle interface is the total reflection. A surface formed such that the angle on the low refractive index layer side is an obtuse angle with respect to the incident surface at the interface. That is, the low emission angle interface or the high emission angle interface corresponds to the entire surface or a part of the total reflection interface.

According to the present invention, the first side region and the second side region that become the upper side region and the lower side region in use are provided, and in the upper side region, the total reflection interface among the different refractive index interfaces is relative to the incident surface. By having the low emission angle interface formed so that the angle on the low refractive index layer side is an acute angle, light deflected so that the emission angle becomes smaller than the incident angle is emitted. As a result, it is possible to make the emitted light travel far and to prevent direct light from reaching the human eye while improving the illuminance over a wide range.
On the other hand, in the lower side region, the total reflection interface has a high exit angle interface formed so that the angle on the low refractive index layer side is an obtuse angle with respect to the entrance surface, so that the exit angle is the incident angle. The light deflected so as to be larger than that is emitted. Thereby, the emitted light can be jumped up in a direction near the light control member, and it is possible to prevent the light from reaching the human eye while improving the illuminance near the light control member.
Thus, by changing the deflection angle of light for each region, it is possible to exhibit both the illuminance improvement and the antiglare function using the daylighting function.

  The light control member of the present invention is characterized in that the first region is an upper region and the second region is a lower region. The reason for this will be described below together with the progress of light in each region.

FIG. 2A is an explanatory diagram for explaining the progress of light in the first region, and FIG. 2B is an explanatory diagram for explaining the progress of light in the second region. In FIG. 2, the incident light L1 is assumed incident angle theta _in respect greater light control member than the incident light L2. Further, θ _{PH in} FIG. 2 means a traveling angle of light traveling through the high refractive index layer.
As shown in FIG. 2A, in the first region 1A, the total reflection interface F has a low emission angle interface F1 that forms an acute angle with respect to the incident surface 5 on the low refractive index layer 3 side. L1 is deflected so that the outgoing angle θ _out becomes smaller than the incident angle θ _in when reflected at the low outgoing angle interface F1. The outgoing light L1 ′ that has been deflected and emitted can travel far away because the outgoing angle θ _out is small. At this time, when light L2 having a small incident angle θ _in is incident, depending on the degree of inclination of the low emission angle interface F1, the light L2 may be output as it is without being reflected at the low emission angle interface F1.
For this reason, if all the light control members have the structure of the first region, the light emitted without being reflected at the low emission angle interface easily reaches the human eye, and the light control member has a high eye height. If it is lower than the above, there is a problem that the light reflected and emitted from the low emission angle interface also easily reaches the human eye.

On the other hand, as shown in FIG. 2B, in the second region 1B, the total reflection interface F has a high exit angle interface F2 that forms an obtuse angle on the low refractive index layer 3 side with respect to the incident surface 5, incident light L2 at the time of reflection at high exit angle interface F2, is deflected to the emission angle theta _out is larger than the incident angle theta _in. Since the outgoing light L2 ′ that has been deflected and emitted has a large outgoing angle θ _out, the outgoing light L2 ′ can be hopped up in a direction close to the light control member. At this time, when light L1 having a large incident angle is incident, depending on the degree of inclination of the high exit angle interface F2, it may be emitted as it is without being reflected at the high exit angle interface F2, and the exit light L1 ′ reaches the human eye directly. It becomes easy to do.
For this reason, if the light control member has the structure of the second region, the illuminance near the light control member is improved. However, since the light is emitted at an angle larger than the incident angle, the emitted light can travel far. However, there is a problem that it is difficult to improve the illuminance over a wide range. Further, when the light control member is located at a position higher than the height of the human eye, there is a problem that the light emitted as it is without being reflected at the high emission angle interface easily reaches the human eye.

  As described above, in the two regions, the progress of the outgoing light differs depending on the inclination of the low emission angle interface or the high emission angle interface of the total reflection interface and the incident angle of the light. Therefore, as shown in FIG. 1, the light control member of the present invention is arranged such that when used, the first region having the low emission angle interface is arranged on the upper side, and the second region having the high emission angle interface is arranged on the lower side. It is possible to achieve an anti-glare effect by reducing direct light while improving illuminance over a wide range.

  Hereinafter, each structure of the light control member of this invention is demonstrated.

1. First area (upper area)
The first region in the light control member of the present invention has a high refractive index layer and a low refractive index layer having a refractive index lower than that of the high refractive index layer, and the high refractive index layer and the low refractive index layer are formed of light. Between the high refractive index layer and the low refractive index between an incident surface that is a surface on which light is incident and an output surface that is a surface on which the light is emitted and faces the incident surface The interface of the different refractive index, which is the interface of the layers, or the extended surface of the interface of the different refractive index is disposed so as to intersect the exit surface and the entrance surface, and is disposed on one side in a direction parallel to the entrance surface and the exit surface. It is what is done.
In the first region, the total reflection interface, which is the different refractive index interface where the high refractive index layer is located on one side, has an acute angle with respect to the incident surface on the low refractive index layer side. And having a low emission angle interface.
The first region is an upper region that is disposed on the upper side when the light control member is used.

  Here, the fact that the first region is arranged on one side in the direction parallel to the incident surface and the emitting surface means that the first region is arranged on the upper side of the light control member in use. That is, the first region may be disposed on the entire surface above the second region, or may be disposed on a portion above the second region.

(1) Different Refractive Index Interface The different refractive index interface is an interface between the high refractive index layer and the low refractive index layer, and the different refractive index interface or an extended surface of the different refractive index interface is an exit surface. And intersects the entrance plane.
Note that the extended surface of the different refractive index interface intersects with the exit surface and the incident surface, for example, as shown in FIG. 5 described later, the different refractive index interface f intersects with the incident surface 5 but intersects with the exit surface 6. Even if not, it means that the extended surface f ′ of the interface of different refractive index f intersects the exit surface 6.

(A) Total reflection interface The total reflection interface is a surface in which a high refractive index layer is located on one side in a direction parallel to the entrance surface and the exit surface, that is, the use of a light control member. Sometimes the high refractive index layer is on the upper side. The total reflection interface has a low emission angle interface formed such that the angle on the low refractive index layer side with respect to the incident surface is an acute angle.

The angle formed by the low exit angle interface on the low refractive index layer side with respect to the incident surface (hereinafter sometimes abbreviated as the angle formed by the low exit angle interface) is not particularly limited as long as it is an acute angle. It can be defined by the method.
First, light incident at a desired incident angle is controlled at a desired angle according to the difference between the refractive index outside the light control member (for example, the refractive index of air or the like) and the refractive index inside the light control member. Progress in the member. At this time, the traveling angle of the light traveling through the high refractive index layer in the light control member is represented by the following formula (1). For this reason, it is preferable that the angle formed by the low emission angle interface is set to an angle capable of totally reflecting light traveling at a desired traveling angle in the high refractive index layer in the light control member.
In the following formulas (1), N ₀ is the refractive index of the region positioned on the light source side with respect to the incident surface, N _P denotes the refractive index of the high refractive index layer. Θ _in and θ _PH mean the incident angle and the traveling angle of light traveling through the high refractive index layer, respectively.

Here, in order to cause total reflection with respect to light having various incident angles, the range of angles formed by the low emission angle interface can be defined from the range of desired incident angles. That is, the suitable range of the angle formed by the low emission angle interface can be calculated from the following formula (2). In the following formula (2), θ _inA and θ _inB are the upper and lower limits (θ _inA <θ _inB ) of the incident angle of light. Further, θ ₁ is an angle formed by the low emission angle interface and is an acute angle, and thus is defined within a range of 0 ° <θ ₁ <90 °.

As shown in FIG. 3A, the total reflection interface in this region may be the low reflection angle interface F1 as a whole, as shown in FIGS. 3B to 3D. A part of the reflection interface F may be a low emission angle interface F1 and may have a multi-stage shape having a plurality of surfaces having different angles with the incident surface.
In the case of a multi-stage shape, as shown in FIG. 3C, the total reflection interface F may have a plurality of low emission angle interfaces F1 having different angles with the incident surface 5, and further in FIG. As shown, a part of the total reflection interface F has a curved low emission angle interface F1, and the tangent line P of the low emission angle interface F1 forms an acute angle with respect to the incident surface 5 on the low refractive index layer side. May be.
Especially, it is preferable that the total reflection interface has a multistage shape having a plurality of surfaces having different angles with the incident surface. This is because the light incident at various incident angles can be deflected so that the outgoing angle is smaller than the incident angle, and the daylighting function can be exhibited. In addition, the multistage shape allows incident light to be repeatedly reflected and deflected, and the emission angle can be further reduced. In particular, the multistage shape is preferably a two-stage shape or a three-stage shape.
In the case of a multi-stage shape, it is preferable that the low emission angle interface closer to the incident surface side has a smaller angle formed by the low emission angle interface. For example, in FIG. 3C, the angle θ _1a formed by the low exit angle interface F1a with respect to the incident surface 5 is preferably smaller than the angle θ _1b formed by the low exit angle interface F1b. This is because the target range of the incident angle of light that can be deflected by total reflection can be widened.

The total reflection interface preferably has high smoothness in order to reflect a lot of light. Specifically, the arithmetic average roughness (Ra) of the total reflection interface is preferably 50 nm or less, more preferably 25 nm or less, and particularly preferably 10 nm or less. If the arithmetic average roughness (Ra) of the total reflection interface is larger than the above upper limit value, light scattering occurs at the total reflection interface, and the amount of outgoing light traveling far away or near the top is reduced, so that the illuminance cannot be improved. There is a case.
The arithmetic average roughness (Ra) of the total reflection interface is determined by a measurement method using a non-contact white interferometer or a measurement method by cross-sectional observation using a scanning electron microscope (SEM).
About the measuring method by a non-contact type white interferometer, using a non-contact type white interferometer (manufactured by Canon, Zygo NewView 6200), a three-point average value measured in a measurement range of 50 μm × 50 μm was calculated as an arithmetic average roughness (Ra ).
Moreover, about the measuring method by cross-sectional observation using a scanning electron microscope (SEM), according to the prescription | regulation of JISB0601 2001, the cross section of a total reflection interface is observed by SEM at 23 degreeC, and interface is obtained from the obtained image. A contour line (roughness curve) is extracted, and a value calculated by the following method is used as an arithmetic average roughness (Ra).
(Calculation method of arithmetic average roughness (Ra))
Only the reference length is extracted from the roughness curve in the direction of the average line, the X-axis is taken in the direction of the average line of the extracted portion, the Y-axis is taken in the direction of the vertical magnification, and the roughness curve is expressed as y = f (x) The value obtained by the following formula (3) is expressed in micrometers (nm) as a calculated value.

In this region, it is preferable to have a plurality of total reflection interfaces, but the shape of each total reflection interface may be the same or different.
Further, the angles formed by the low emission angle interfaces of the total reflection interfaces may all be the same, or may be different for each total reflection interface F as shown in FIG. In particular, it is preferable that the acute angle formed by the low emission angle interface is smaller as it is located above this region during use. The smaller the acute angle formed by the low exit angle interface, the more the light can travel, while the larger the acute angle formed by the low exit angle interface, the more light can travel near the top. In order to perform daylighting efficiently in this region, it is preferable to have a structure in which the acute angle formed by the low emission angle interface is smaller toward the upper side of this region and larger toward the lower side. At this time, since the acute angle formed by the low emission angle interface changes stepwise, the light emission angle also changes stepwise, so that the occurrence of uneven lighting can be suppressed.

(B) Different Refractive Index Interface The shape of the different refractive index interface that is not the total reflection interface is not particularly limited, and may be a shape that is orthogonal to the incident surface and the outgoing surface, and at least a part of the desired refractive interface is desired. The shape which has the angle of may be sufficient. Further, it may be a multi-stage shape like the total reflection interface.

  Also, the different refractive index interface that is not the total reflection interface may be a smooth surface or a rough surface.

(2) High-refractive index layer The high-refractive index layer is formed between an incident surface that is a surface on which light is incident and an output surface that is a surface on which light is emitted and is opposed to the incident surface. Is to be arranged.

  The material constituting the high refractive index layer is not particularly limited as long as it has a high light transmittance and a refractive index higher than that of the low refractive index layer. For example, a thermosetting resin or an ionizing radiation curable resin is used. Etc. Among these, ionizing radiation curable resins are preferred from the viewpoint of curability.

  Examples of thermosetting resins include epoxy resins, phenol resins, urea resins, unsaturated polyester resins, melamine resins, alkyd resins, polyimide resins, silicone resins, hydroxyl functional acrylic resins, carboxyl functional acrylic resins, and amide functional copolymers. A polymer, a urethane resin, etc. are mentioned. The cross-linking and curing mode of these thermosetting resins is not particularly limited, and the thermosetting resin is cross-linked and cured using a commonly used cross-linking agent or curing agent.

Examples of the ionizing radiation curable resin include an ultraviolet curable resin, an electron beam curable resin, a visible light curable resin, a near infrared curable resin, and the like. To UV curable resins and electron beam curable resins are preferred.
The ultraviolet curable resin and the electron beam curable resin can be appropriately selected from conventionally used polymerizable oligomers or prepolymers. Examples thereof include polymerizable oligomers or prepolymers, and particularly polyfunctional polymerizable oligomers or prepolymers.
Polymerizable oligomers or prepolymers include epoxy (meth) acrylate, urethane (meth) acrylate, polyether urethane (meth) acrylate, caprolactone urethane (meth) acrylate, polyester (meth) acrylate, polyether ( Examples include (meth) acrylate oligomers and prepolymers. These may be used alone or in combination of two or more. (Meth) acrylate refers to acrylate or methacrylate.

  In addition to the above polymerizable oligomers or prepolymers, reactive monomers such as polythiols, reactive monomers such as vinyl pyrrolidone, 2-ethylhexyl acrylate, β-hydroxy acrylate, and tetrahydrofurfuryl acrylate may be used. .

  When using an ionizing radiation curable resin as the material for the high refractive index layer, it is preferable that a photopolymerization initiator is included. As said photoinitiator, it can select suitably according to the kind of ionizing radiation, For example, photopolymerization initiators, such as a ketone type and an acetophenone type, can be used. In addition, as content of the said photoinitiator, about 0.1 mass part-about 5 mass parts are preferable with respect to 100 mass parts of ionizing radiation curable resins.

  In addition to the above resin, the high refractive index layer is a weather resistance improver such as an ultraviolet absorber, a light stabilizer, an antioxidant, a crosslinking agent, a hard coat agent, a scratch-resistant filler, a polymerization inhibitor, an antistatic agent, a leveling agent, You may contain additives, such as a thixotropy imparting agent, a coupling agent, a plasticizer, an antifoamer, and a filler.

  The refractive index of the high refractive index layer is not particularly limited as long as the refractive index is higher than that of the low refractive index layer and a desired daylighting function can be exhibited. For example, the refractive index is within the range of 1.40 to 1.80, particularly 1.45 to 1.45. It is preferable to be within the range of 1.65, particularly within the range of 1.55 to 1.60. The refractive index of the high refractive index layer is a value obtained by measuring a refractive index of 589 nm using a multiwavelength Abbe refractometer (manufactured by Atago Co., Ltd.).

  The high refractive index layer preferably has high light transmittance. For example, the visible light transmittance is preferably 70% or more, more preferably 80% or more, and particularly preferably 90% or more. This is because when the high refractive index layer has the above-described predetermined light transmittance, more light can be transmitted and a light control member having a high daylighting function can be obtained. The visible light transmittance is a value measured within a measurement wavelength range of 380 nm to 780 nm using an infrared visible ultraviolet spectrophotometer (UV-3100PC, manufactured by Shimadzu Corporation).

The thickness of the high refractive index layer is not particularly limited as long as a desired daylighting function is exhibited. For example, the thickness is preferably less than 300 μm, more preferably less than 250 μm, and particularly preferably less than 200 μm. . Moreover, as a lower limit of the thickness of a high refractive index layer, it is usually preferable that it is 10 micrometers or more. This is because if the thickness of the high refractive index layer is larger than the above range, the area of the total reflection interface becomes relatively small, so that the daylighting function and the antiglare function may not be sufficiently exhibited.
The thickness of the high refractive index layer refers to the length from the entrance surface to the exit surface of the high refractive index layer.

  In addition, the high refractive index layer only needs to have a size in which the width of the narrowest portion of the gap between the different refractive index interfaces can exhibit a desired daylighting function and antiglare function. It is appropriately set depending on the width of the layer and the arrangement interval between adjacent total reflection interfaces.

  The cross-sectional shape of the high refractive index layer is not particularly limited as long as the total reflection interface has a low emission angle interface.

(3) Low-refractive index layer The low-refractive index layer has a lower refractive index than the high-refractive index layer, and is an incident surface that is a surface on which light is incident, a surface that emits light, and It is arrange | positioned between the output surfaces which are surfaces facing an incident surface.

The material constituting the low refractive index layer is not particularly limited as long as it has a high light transmittance and a refractive index lower than that of the high refractive index layer. For example, a thermosetting resin or an ionizing radiation curable resin is used. Etc.
The low refractive index layer may be air quality. This is because the air quality generally has a lower refractive index than other materials such as resin.

  The thermosetting resin and ionizing radiation curable resin used for the low refractive index layer are the same as the thermosetting resin and ionizing radiation curable resin described in the above-mentioned section “(2) High refractive index layer”. Therefore, the description here is omitted.

  When using an ionizing radiation curable resin as the material for the low refractive index layer, it is preferable that a photopolymerization initiator is contained. About the kind and content of the said photoinitiator, since it can be made to be the same as that of the content demonstrated by the term of the above-mentioned "(2) High refractive index layer", description here is abbreviate | omitted.

  The low refractive index layer includes, for example, a weather resistance improver such as a light stabilizer, a polymerization inhibitor, a crosslinking agent, an antistatic agent, an adhesion improver, an antioxidant, a leveling agent, a thixotropic agent, a coupling agent, a plasticizer. An agent, an antifoaming agent, a filler and the like may be included.

  The cross-sectional shape of the low refractive index layer is not particularly limited as long as the total reflection interface has a low emission angle interface. Specific examples of the cross-sectional shape of the low refractive index layer include the cross-sectional shape of a groove exemplified in FIG.

  The width of the low refractive index layer is not particularly limited as long as it is a size that does not impair the daylighting function and the antiglare function, and can be appropriately set according to the configuration mode, application, and the like of the light control member. For example, in the widest portion, it is preferably in the range of 5 μm to 150 μm, more preferably in the range of 10 μm to 100 μm, and particularly preferably in the range of 15 μm to 50 μm. If the width of the low refractive index layer is larger than the above range, light may not be easily transmitted. On the other hand, if the width is smaller than the above range, a desired function may not be achieved in the low refractive index layer. . In addition, the width | variety of a low-refractive-index layer is a part shown by a in FIG.1 (b).

  The thickness of the low refractive index layer should be set as appropriate according to the arrangement of the low refractive index layer within the range of the thickness of the high refractive index layer described in the section “(2) High refractive index layer”. Can do.

  The refractive index of the low refractive index layer is not particularly limited as long as it has a refractive index lower than that of the high refractive index layer and can exhibit a desired daylighting function and the functions of the above-described various additives. It is preferably in the range of 1.80, in particular in the range of 1.45 to 1.65, particularly in the range of 1.45 to 1.50. The refractive index of the low refractive index layer is a value obtained by measuring a refractive index of 589 nm using a multiwavelength Abbe refractometer (manufactured by Atago Co., Ltd.).

  The visible light transmittance of the low refractive index layer is preferably high, for example 70% or more, more preferably 80% or more, and particularly preferably 90% or more, although it depends on the material contained. The visible light transmittance is a value measured within a measurement wavelength range of 380 nm to 780 nm using an infrared visible ultraviolet spectrophotometer (UV-3100PC, manufactured by Shimadzu Corporation).

(4) Incident surface and exit surface The incident surface in this region is the surface on the side where light enters. The exit surface is a surface on the side from which light is emitted and is a surface facing the entrance surface.
When the low refractive index layer is air quality, at least one of the entrance surface and the exit surface of the low refractive index layer may be a virtual surface.

(5) Others The larger the refractive index difference between the high refractive index layer and the low refractive index layer, the better. This is because total reflection of incident light is likely to occur at the total reflection interface, and the amount of light collected can be increased. Specifically, the refractive index difference is preferably 0.03 or more, and particularly preferably 0.05 or more. When the difference in refractive index is less than 0.03, when chromatic dispersion of total reflection occurs, the long wavelength component may not be totally reflected, and only the short wavelength component may be totally reflected, resulting in a change in daylighting color. This is because it is not preferable.

Further, the arrangement interval between adjacent total reflection interfaces may be equal or different. In addition, since the number of arrangement | positioning of a total reflection interface increases so that the said arrangement | positioning space | interval is small, it becomes possible to aim at the improvement of a daylighting function.
The arrangement interval of the total reflection interfaces is, for example, preferably in the range of 15 μm to 200 μm, particularly in the range of 20 μm to 150 μm, in the widest part of the arrangement interval of adjacent total reflection interfaces. In addition, the arrangement | positioning space | interval of a total reflection interface is a part shown by b in FIG.1 (b).

  The high refractive index layer or the low refractive index layer may contain an additive for adding other functions to such an extent that the lighting function of the light control member of the present invention is not impaired. Examples of such additives include heat ray absorbers, ultraviolet absorbers, and light scattering agents. When a heat ray absorbent, an ultraviolet absorber, or the like is included, the high refractive index layer or the low refractive index layer can have a heat ray absorbing function, an ultraviolet absorbing function, or the like. When a light scattering agent is included, the high refractive index layer or the low refractive index layer scatters and reflects light within the layer, or scatters and transmits light, thereby increasing the amount of light collected. .

2. Second area (lower area)
The second region in the light control member of the present invention has a high refractive index layer and a low refractive index layer having a refractive index lower than that of the high refractive index layer, and the high refractive index layer and the low refractive index layer are formed of light. Between the high refractive index layer and the low refractive index between an incident surface that is a surface on which light is incident and an output surface that is a surface on which the light is emitted and faces the incident surface The other refractive index interface, which is the interface of the layers, or the extended surface of the different refractive index interface is arranged so as to intersect the exit surface and the entrance surface, and the other side in the direction parallel to the entrance surface and the exit surface Is to be arranged.
In the second region, the total reflection interface has a high emission angle interface formed such that the angle on the low refractive index layer side with respect to the incident surface is an obtuse angle.
The second region is usually a lower side region that is disposed on the lower side when the light control member is used.

  Here, the fact that the second region is arranged on the other side in the direction parallel to the incident surface and the emitting surface means that the second region is arranged on the lower side of the light control member in use. That is, the second region may be disposed on the entire surface below the first region, or may be disposed on a portion below the first region.

(1) Different Refractive Index Interface The different refractive index interface in this region is the same as that described in “1. First region”.
In addition, the total reflection interface in the different refractive index interface is the same as that described in “1. First region”, but the angle on the low refractive index layer side with respect to the incident surface is an obtuse angle. It has a high exit angle interface formed.

  The angle formed by the high exit angle interface on the low refractive index layer side with respect to the incident surface (hereinafter sometimes abbreviated as the angle formed by the high exit angle interface) is not particularly limited as long as it is an obtuse angle. The angle formed by the low emission angle interface can be calculated by the method described in the section “1st region”, and can be set within the range of the value obtained by subtracting the calculated value from 180 °.

Regarding the shape of the total reflection interface in this region, “low emission interface”, “acute angle” and “output angle is (small)” described in “1. ”,“ Obtuse angle ”, and“ exit angle is (large) ”, which is the same as the above, and the description thereof is omitted here.
In addition, about the example of the shape of the total reflection interface in this area | region, the shape of the total reflection interface in the 1st area | region shown to Fig.3 (a)-(d) was reversed by making an incident surface or an output surface into a symmetrical surface. Corresponds to the shape.

  The arithmetic average roughness of the total reflection interface is the same as that described in the section “1. First region” described above, and thus the description thereof is omitted here.

Although it is preferable to have a plurality of total reflection interfaces, the cross-sectional shape of each total reflection interface may be the same or different.
In addition, the angles formed by the high emission angle interfaces at each total reflection interface may all be the same, or may be different for each total reflection interface. In particular, it is preferable that the obtuse angle formed by the high emission angle interface increases as it goes to the lower side of this region during use. The smaller the obtuse angle formed by the high exit angle interface, the more the light can travel, while the greater the obtuse angle formed by the high exit angle interface, the more light can travel near the light control member. Therefore, in order to perform daylighting efficiently in this region, it is preferable to have a structure in which the obtuse angle formed by the high emission angle interface is smaller toward the upper side of this region and larger toward the lower side. At this time, since the obtuse angle formed by the high emission angle interface changes stepwise, the light emission angle also changes stepwise, so that the occurrence of uneven lighting can be suppressed.

  The different refractive index interface that is not the total reflection interface is the same as that described in the section “1. First region”.

(2) High Refractive Index Layer, Low Refractive Index Layer, Incident Surface, and Outgoing Surface For details on the high refractive index layer, low refractive index layer, incident surface, and outgoing surface in this region, see “1. First Region”. Since the contents are the same as those described in, a description thereof is omitted here.

(3) Others Other details of this area are the same as the contents described in the section “1. First area”, and thus the description thereof is omitted here.

3. Mode of Light Control Member As illustrated in FIG. 1, the light control member of the present invention is a mode in which the high refractive index layer and the low refractive index layer are independently arranged in the first region and the second region. The light transmitting portion and the refractive index may be provided in the light transmitting portion formed of a transparent resin in each of the first region and the second region, and in the plurality of grooves formed on one surface of the light transmitting portion. A filling layer formed by filling different materials, wherein one of the filling layer and the light transmitting portion located between the filling layers is the high refractive index layer and the other is the low refractive index layer (Hereafter, it may be called a louver aspect.). Especially, it is preferable that the light control member of this invention is a louver aspect. This is because, by adopting the louver mode, light can be deflected at the interface of the different refractive index between the light transmission part and the filling layer, and the light can travel far or directly above. Moreover, since the light control member can be formed into a single sheet, it is easy to handle.

  Examples of the light control member in which the high refractive index layer and the low refractive index layer are independently arranged include an embodiment in which the high refractive index layer and the low refractive index layer are fixed by a support member such as a base material. In addition, when the low refractive index layer is air quality, the high refractive index layer is arranged and fixed with a support member so that the adjacent total reflection interface is at a desired interval, so that the low refractive index layer is low between adjacent high refractive index layers. It can be set as the aspect which has a refractive index layer.

On the other hand, as a louver-like light control member, for example, as shown in FIG. 5, the light control member 20 includes a light transmission portion 12 made of a transparent resin, and a groove portion formed on one surface of the light transmission portion 12. 14 and has a filling layer 13 having a refractive index different from that of the light transmitting portion 12. At this time, of the interface between the light transmission part 12 and the filling layer 13, the interface at the position intersecting with the incident surface 5 and the reflecting surface 6 becomes the different refractive index interface f.
In the example of the light control member 20 shown in FIG. 5, the light transmitting portion 12 is a high refractive index layer and the filling layer 13 is a low refractive index layer. In 11A, the groove 14 has an opening O on the incident surface 5 side, and in the lower side region 11B arranged on the lower side, the groove 14 has an opening O on the emission surface 6 side. Further, in the upper side region 11A, the total reflection interface F, which is the different refractive index interface f where the light transmission part 12 is located on the one X side, has an acute angle θ ₁ on the filling layer 13 side with respect to the incident surface 5. It has a low emission angle interface F1 formed as described above. On the other hand, the in the lower region 11B, the total reflection interface F, which is a modified refractive index boundary f light transmission portion 12 is positioned on the side of the contrast X is, the angle of the filling layer 13 side to the incident surface 5 theta ₂ is obtuse A high exit angle interface F2 formed to be

As another light control member of the louver mode, the light transmitting portion is a low refractive index layer, the filling layer is a high refractive index layer, the groove portion has an opening on the exit surface side in the upper side region, and the lower side region The groove may have an opening on the incident surface side.
Further, the light transmission part and the filling layer in the upper side region are respectively a high refractive index layer and a low refractive index layer, while the light transmission part and the filling layer in the lower side region are respectively a low refractive index layer and a high refractive index layer, The grooves in both regions may have openings on the incident surface side.
Furthermore, the light transmitting portion and the filling layer in the upper side region are a low refractive index layer and a high refractive index layer, respectively, while the light transmitting portion and the filling layer in the lower side region are respectively a high refractive index layer and a low refractive index layer. The grooves in both regions may have an opening on the exit surface side.

Among them, when the light control member of the present invention is in a louver mode, the filling layer is a low refractive index layer, the light transmission portion located between the filling layers is a high refractive index layer, and in the upper side region It is preferable that the groove has an opening on the incident surface side, and the groove has an opening on the emission surface side in the lower region. The reason is as follows.
When light is reflected or refracted, total reflection occurs at the interface of different refractive index only when light is incident from the high refractive index region to the low refractive index region according to Snell's law. On the other hand, when light enters the high refractive index region from the low refractive index region, reflection occurs at the interface of different refractive indexes, but total reflection does not occur. In other words, in order to obtain a high daylighting function in the light control member, it is preferable to totally reflect light at the interface of different refractive indexes, so it is necessary to increase the proportion of light incident from the high refractive index region to the low refractive index region. There is.
Therefore, by setting the light control member to the louver mode having the above-described structure, light can easily enter from the high refractive index layer to the low refractive index layer, and more light can be totally reflected. Further, with the above-described structure, the light deflected in the upper side region can travel farther, while the light deflected in the lower side region can jump up in a direction closer to the top. .

  Hereinafter, each structure of the light control member which has a louver aspect is demonstrated.

(I) Light transmission part A light transmission part is comprised with transparent resin, and the some groove part was formed in one surface.

(Groove)
Of the interface between the groove and the light transmitting portion, the surface where the extended surface of the interface intersects the exit surface and the entrance surface is a different refractive index interface.
The cross-sectional shape of the groove is not particularly limited as long as one of the interfaces with different refractive indexes is a total reflection interface, and the total reflection interface has a low emission angle interface or a high emission angle interface. Thus, a triangle (FIG. 6 (a)), a trapezoid shape (FIG. 6 (b)), a polygon (FIG. 6 (c)), etc. are mentioned. Further, as shown in FIG. 6D, a part of the total reflection interface F may be curved. In FIG. 6, the reference numerals of the low emission angle interface and the high emission angle interface are omitted.
At this time, the shape of the different refractive index interface on the side that does not become the total reflection interface is not particularly limited.

  Moreover, the adjacent groove part may be formed in parallel, may be formed at random, and may be formed crossing. Especially, it is preferable that the linear groove part is formed in parallel, respectively.

The groove has an opening on the incident surface side or the emission surface side. Examples of the shape of the opening include a linear shape and a curved shape.
Whether the opening is provided on the incident surface or the exit surface is determined according to the region in the light transmission portion and the refractive index of the light transmission portion and the filling layer. When the filling layer is a low refractive index layer and the light transmitting portion located between the filling layers is a high refractive index layer, the groove portion has an opening on the incident surface side in the upper region, and the groove portion emits in the lower region. It is preferable to have an opening on the surface side.

The depth of the groove is not particularly limited as long as the total reflection interface can exhibit a desired function. For example, the depth is preferably in the range of 10 μm to 200 μm, and more preferably in the range of 150 μm to 200 μm. At this time, the depth of the groove is preferably 50% or more with respect to the thickness of the light transmission part, and more preferably in the range of 70% to 90%.
In addition, the depth of a groove part means the length from the opening part of a groove part to the concavemost end, and is a part shown by c in FIG.

  Although it does not specifically limit about the width | variety of a groove part, The effect of this invention can be show | played, so that it is small. Specifically, when the filling layer is a low refractive index layer, it can be set as appropriate within the range of the width of the low refractive index layer described in “1. First region”. Further, even when the filling layer is a high refractive index layer, it can be the same as the width range set when the filling layer is a low refractive index layer.

  In addition, the arrangement interval of the groove portions can be appropriately set within the specified range of the arrangement interval of the total reflection interface described in the section “1. First region”.

(Light transmission part)
The light transmissive portion may be a high refractive index layer or a low refractive index layer, and can be appropriately selected according to the refractive index of the filling layer. preferable. In order to obtain a high daylighting function in the light control member, it is preferable that the light is totally reflected at the interface of the different refractive index, and according to Snell's law, the amount of light incident from the high refractive index region to the low refractive index region is increased. There is a need. Therefore, in the louver-like light control member, it is preferable that the light transmission part is a high refractive index layer in order to easily cause total reflection.

  Examples of the transparent resin that constitutes the light transmitting portion that is the high refractive index layer include the thermosetting resins and ionizing radiation curable resins that are used in the high refractive index layer described above. The light transmitting portion may include any material in the high refractive index layer described in the section “1. First region” described above.

  The other details of the light transmissive portion which is the high refractive index layer are the same as the details and contents of the high refractive index layer described in the section “1. First region” described above, and thus the description thereof is omitted here. To do.

(Ii) Filling layer The filling layer is formed by filling a material having a refractive index different from that of the light transmitting portion into a plurality of grooves formed on one surface of the light transmitting portion.
The filling layer may be a high-refractive index layer or a low-refractive index layer, and can be appropriately selected according to the refractive index of the light transmission part. preferable.
The material constituting the filling layer which is a low refractive index layer may be made of the resin used for the low refractive index layer described above, or may be air quality.
Other details of the filling layer, which is a low refractive index layer, are the same as the details and contents of the low refractive index layer described in the above-mentioned section “1. First region”, and thus the description thereof is omitted here. .

  Further, the shape, dimensions, etc. of the filling layer are the same as the shapes, dimensions, etc. of the groove portions described in the section “(i) Light transmitting portion”, and thus the description thereof is omitted here.

(Iii) Others The light control member in the louver mode is a single light by laminating two sheets having the above-described louver mode so that one is an upper side region and the other is a lower side region. It can be a control member.
Further, as shown in FIG. 7A, two sheets having a louver shape are arranged such that one is an upper side region 11A and the other is a lower side region 11B with an adhesive layer 52 on the incident surface 5 side. Thus, a single light control member 20 may be provided by providing the base 51. At this time, on the surface opposite to the surface on which the upper side region 11A and the lower side region 11B of the base material 51 are arranged, a second adhesive layer and a release layer for bonding with an adherend such as a window glass are provided. You may have.
Further, as shown in FIG. 7B, two sheets having a louver shape are provided with an adhesive layer 52 on the incident surface 5 side so that one is an upper region 11A and the other is a lower region 11B. In addition, a single light control member 20 may be provided by providing a functional layer 53 such as a hard coat layer or a scattering layer on the exit surface 6 side.
In the case of a single-sheet light control member shown in FIGS. 7A and 7B, an intermediate region described later may be provided between the upper side region and the lower side region.
Further, as shown in FIG. 7 (c), two sheets having a louver shape are formed such that one is an upper side region 11A and the other is a lower side region 11B, and an adhesive layer 52a on the incident surface 5 side, respectively. One light control member may be formed in a bonded state by providing 52b and bonding to one surface of the adherend 53 such as a window glass. At this time, the lower region has the same shape as the light incident surface of the upper region and the light incident surface of the upper region, so the surface of the sheet of the upper region that does not have a groove opening. It can be set as a lower side region by arranging an adhesive layer on the side, inverting it, and bonding it to the adherend. Moreover, when bonding, you may provide the intermediate | middle area | region mentioned later between an upper side area | region and a lower side area | region.
FIG. 7 is a schematic cross-sectional view showing another example of the light control member in the present invention. The constituent parts of the upper side region and the lower side region are the same as the constituent parts of the first region and the second region in FIG. Since these are the same, the reference numerals are omitted.

4). Arbitrary member The light control member of this invention may have arbitrary other members. Hereinafter, arbitrary members will be described.

(1) Support Member The light control member of the present invention may have a support member that supports the first region and the second region. About the said supporting member, although it can select according to the form of a light control member, and a use, the connection member etc. of a slat used with a base material, a general blind, etc. are mentioned, for example.

Examples of the substrate include a resin film, a resin sheet, a cloth sheet, a mesh, and the like, and can be appropriately selected according to the use of the light control member of the present invention, but those having high light transmittance are preferable.
The resin used for the resin film and the resin sheet may be a highly light-transmitting resin such as acrylic, styrene, acrylonitrile, polyethylene terephthalate, polycarbonate, polyester, polyurethane, polyvinyl alcohol, vinyl chloride, fluororesin, and rubber. Can be mentioned. Moreover, the said base material may contain antioxidant, a ultraviolet absorber, etc.

  In addition, the resin film and the resin sheet may perform surface treatment etc. on one side or both sides as needed. As the above-mentioned surface treatment, surface treatment by an oxidation method such as corona discharge treatment, chromic acid treatment (wet), flame treatment, hot air treatment, ozone ultraviolet irradiation treatment, or surface treatment by an uneven method such as a sand blast method or a solvent treatment method. And chemical surface treatment.

  The cloth sheet is not particularly limited as long as it has optical transparency, and examples thereof include chemical fiber woven fabric, inorganic fiber woven fabric, non-woven fabric, lace, and paper woven fabric. Examples of the mesh include metal nets, glass fiber nets, resin nets such as nylon and polyester.

  The film thickness of the base material can be appropriately selected according to the application of the light control member of the present invention, but is preferably in the range of 5 μm to 200 μm, and more preferably in the range of 10 μm to 150 μm.

  As the arrangement position of the base material, it may be provided on either the incident surface side or the exit surface side of the light control member, and may be provided on both surfaces, but the base material is provided on both surfaces. preferable. This is because the sheet used in the first region can be reversed and arranged as the second region, and the light control member of the present invention can be easily manufactured.

  Moreover, as a connecting member of a slat generally used for a blind or the like, a frame portion, a tilting mechanism, a shaft portion, and the like can be given. In addition, the said connection member is used when arrange | positioning a high refractive index layer and a low refractive index layer independently.

(2) Adhesive layer The light control member of this invention may have the adhesive layer for making it bond to desired members, such as a base material and a window glass.

  Although it does not specifically limit as an adhesion layer, For example, what uses a rubber-type, an acryl-type, an olefin type, a polyester-type, a polyurethane-type adhesive, etc. as an adhesive main ingredient is mentioned. Examples of such an adhesive layer include a pressure-sensitive adhesive layer.

  The thickness of the adhesive layer is not particularly limited as long as the light control member of the present invention can be bonded to a desired member. For example, the thickness is preferably in the range of 5 μm to 100 μm, and more preferably in the range of 10 μm to 75 μm. .

  The pressure-sensitive adhesive layer may be provided on the incident surface side of the light control member, or may be provided on the emission surface side, and is appropriately selected according to the usage mode of the light control member of the present invention. Moreover, in each area | region of a light control member, the position which provides an adhesion layer may differ. For example, an adhesive layer may be provided on the incident surface side in the first region, and an adhesive layer may be provided on the output surface side in the second region.

(3) Hard coat layer The light control member of the present invention may have a hard coat layer for the purpose of improving weather resistance and scratch resistance.

  The material for the hard coat layer is not particularly limited as long as it is generally used, and examples thereof include ionizing radiation curable resins. Examples of the ionizing radiation curable resin include acrylate-based, oxetane-based, and silicone-based resins.

  Further, an arbitrary material may be added to the hard coat layer to add other functions. For example, silicone compounds, fluorine compounds, etc. may be added to improve anti-contamination, and to improve antistatic properties, electron conduction types such as PEDOT-PSS, ion conduction types such as lithium salt materials, etc. An antistatic agent may be added. Furthermore, a fluorine compound or the like may be added to the hard coat layer in order to improve water repellency.

  The film thickness of the hard coat layer is not particularly limited as long as the function is sufficiently exhibited, but for example, it is preferably in the range of 0.1 μm to 100 μm, and more preferably in the range of 1.0 μm to 10 μm. .

  In general, the hard coat layer is preferably disposed so as to be the outermost layer in the light control member. For example, when the light control member of the present invention is used by being bonded to a desired adherend via an adhesive layer, the hard coat layer is the outermost layer with respect to the bonding surface with the adherend in the light control member. It is preferable that Further, by adjusting the film thickness of the hard coat layer, it is also possible to serve as a base material.

(4) Other optional members In addition to the above-described members, the light control member of the present invention is flattened, for example, for the purpose of suppressing the occurrence of light diffraction and interference on the entrance surface and the exit surface of the light control member. It may have a layer, a scattering layer, or the like. These layers may be disposed on either the exit surface or the entrance surface side of the light control member, but may be disposed on the exit surface side from the viewpoint of suppressing the occurrence of multiple images and rainbow unevenness on the light control member. preferable.
Moreover, you may have the designable film etc. for improving the designability.

  Furthermore, the light control member of the present invention may have an intermediate region between the first region and the second region. As the intermediate region, for example, a region where the total reflection interface does not have a low output angle interface and a high output angle interface, that is, a high refractive index layer and a low refractive index so that the total reflection interface is orthogonal to the incident surface and the output surface. The area | region where the rate layer is arrange | positioned, etc. are mentioned.

5. Others Since the light control member of the present invention has a high daylighting function, the total light transmittance is preferably 80% or more. The total light transmittance is a value measured using a fully automatic direct reading haze computer (HGM-2DP) manufactured by Suga Test Instruments Co., Ltd.

  Since the light control member of the present invention has an excellent daylighting function, it can be used in a window glass, an opening, or the like of a building, a vehicle, a transport machine, or the like.

B. Next, the roll screen of the present invention will be described. The roll screen of the present invention has at least a screen substrate, an adhesive layer disposed on one surface of the screen substrate, and a light control member disposed on the adhesive layer, and the light control The member is characterized in that the light control member is the same as that described in the above-mentioned “A. Light control member”.

The roll screen of the present invention will be described with reference to the drawings. FIG. 8A is a schematic perspective view of the roll screen of the present invention, and FIG. 8B is a schematic cross-sectional view when viewed from the S direction of FIG. 8A. The roll screen 30 of the present invention includes a screen 21, an adhesive layer 22 disposed on one surface of the screen base 21, and a light control member 20 disposed on the adhesive layer 22 from the light L incident side. It is.
The light control member in FIG. 8 includes a light transmissive portion that is a high refractive index layer, a filling layer that is a low refractive index layer filled in a plurality of grooves formed on one surface of the light transmissive portion, and an optical control member. In the first region located on the upper side during use, the groove portion has an opening on the incident surface side, and in the second region located on the lower side, the groove portion has an opening on the emission surface side. Since this is the same as FIG. 5 described above, description thereof is omitted here.

  According to the present invention, since the above-mentioned light control member is provided on the surface of the screen base material, the deflection angle of light can be changed for each region, and both the illuminance improvement using the daylighting function and the anti-glare function are provided. It becomes a roll screen capable of exhibiting.

  Hereinafter, the details of the roll screen of the present invention will be described.

1. Light Control Member The light control member in the present invention is disposed on the adhesive layer disposed on one surface of the screen base material, and has been described in the above-mentioned “A. Light control member”.
The details of the light control member are the same as those described in the section “A. Light Control Member”, and thus the description thereof is omitted here.

2. Screen base material The screen base material in this invention supports a light-control member and an adhesion layer.
The screen substrate is not particularly limited as long as it has high light transmittance, and those used for general roll screens can be used. Specifically, the resin film, resin sheet, cloth sheet, etc. described in the above-mentioned section “A. Light control member” can be used.

3. Adhesive layer The adhesive layer in this invention is arrange | positioned on one surface of a screen base material, and bonds a screen base material and a light-control member.
The pressure-sensitive adhesive layer is not particularly limited as long as it has high light transmittance. For example, the pressure-sensitive adhesive layer described in the above-mentioned section “A. Light control member” can be used.
The adhesive layer may be disposed on the incident surface or the exit surface of the first region and the second region of the light control member, respectively, and is disposed on the entire screen base material. Also good.

4). Others This invention may have arbitrary members other than the light control member mentioned above, the adhesion layer, and the screen base material.

The roll screen of the present invention can achieve the effects of the present invention by using the incident surface of the light control member arranged on the light source side such as the sun.
At this time, the screen substrate and the adhesive layer may be disposed on the incident surface side of the light control member, or may be disposed on the light emission surface side, and are appropriately designed according to the usage mode of the roll screen of the present invention. For example, as shown in FIG. 8, when the screen base material and the adhesive layer are arranged on the incident surface side of the light control member, the roll screen of the present invention is used with the screen base material on the light source side such as the sun. . On the other hand, when the screen base material and the adhesive layer are disposed on the light emission surface side of the light control member, the roll screen of the present invention is used with the light control member as the light source side.

  The roll screen of the present invention preferably has a high light transmittance. Specifically, the roll screen preferably exhibits a visible light transmittance of the light control member described in the section “A. Light control member”.

C. Daylighting sheet Next, the daylighting sheet of the present invention will be described. The daylighting sheet of the present invention has at least a base material and a light control member disposed on one surface of the base material, and the light control member is described in the above section “A. Light control member”. It is characterized by being.

The daylighting sheet of the present invention will be described with reference to the drawings. FIG. 9 is a schematic sectional view of the daylighting sheet of the present invention. The daylighting sheet 40 of the present invention has the light control member 20 disposed on one surface of the base material 31 and the base material 31 from the light L incident side. In the example shown in FIG. 9, an adhesive layer 32 is further provided between the base material 31 and the light control member 20.
The light control member in FIG. 9 includes a light transmission portion that is a high refractive index layer, a filling layer that is a low refractive index layer filled in a plurality of grooves formed on one surface of the light transmission portion, and a light control member. In the first region located on the upper side during use, the groove portion has an opening on the incident surface side, and in the second region located on the lower side, the groove portion has an opening on the emission surface side. Since this is the same as FIG. 5 described above, description thereof is omitted here.

  According to the present invention, since the above-described light control member is provided on the surface of the base material, the deflection angle of light can be changed for each region, and both the illuminance improvement using the daylighting function and the antiglare function can be achieved. It becomes a daylighting sheet that can be exhibited.

  Hereinafter, the details of the daylighting sheet of the present invention will be described.

1. Light Control Member The light control member in the present invention is disposed on one surface of the base material and is described in the above-mentioned section “A. Light Control Member”.
The details of the light control member are the same as those described in the section “A. Light Control Member”, and thus the description thereof is omitted here.

2. Base material The base material in the present invention supports at least the light control member.
The base material is not particularly limited as long as it has high light transmittance. For example, the resin film, the resin sheet, or the like described in the above-mentioned section “A. Light control member” can be used.
Moreover, functional layers, such as a hard-coat layer, can also be used as the said base material.

3. Arbitrary member Even if the lighting sheet of this invention has a 1st adhesion layer between the said base material and the said light control member in order to bond a light control member on one surface of a base material, Good.
The first pressure-sensitive adhesive layer is not particularly limited as long as it has high light transmittance. For example, the pressure-sensitive adhesive layer described in the above-mentioned section “A. Light control member” can be used.
Further, the first adhesive layer may be disposed on the incident surface or the exit surface of the first region and the second region of the light control member, respectively, and is disposed on the entire surface of the substrate. May be.
In addition, about bonding with a base material and a light-control member, it is also possible to bond by heat welding etc. not via the said 1st adhesion layer.

  Moreover, the lighting sheet of this invention may have a 2nd adhesion layer on the surface facing the surface which has the light control member etc. of a base material. It is because the lighting sheet of this invention can be bonded with adherends, such as a window glass, by having a 2nd adhesion layer. In addition, it is preferable to have a release paper or the like on the surface of the second adhesive layer.

  Furthermore, the daylighting sheet of the present invention may have a functional layer such as a hard coat layer or a scattering layer on the surface facing the substrate side surface of the light control member. Furthermore, you may have a designable film etc. in the desired position of the lighting sheet of this invention.

4). Others The daylighting sheet of the present invention can achieve the effects of the present invention by using the incident surface of the light control unit on the light source side such as the sun.
At this time, the base material in the said daylighting sheet | seat may be arrange | positioned at the entrance plane side of a light control member, or an exit surface side, and is suitably designed according to the usage condition of the daylighting sheet | seat of this invention.
For example, as shown in FIG. 9, when the base material is disposed on the incident surface side of the light control member, the daylighting sheet of the present invention is used with the base material side of the light source such as the sun. On the other hand, when the substrate is disposed on the light exit side of the light control member, the daylighting sheet of the present invention is used with the light control member on the light source side.
In the daylighting sheet of the present invention, the substrate is usually disposed on the incident surface side of the light control member.

  The daylighting sheet of the present invention preferably has a high light transmittance, and specifically, preferably exhibits the visible light transmittance of the light control member described in the section “A. Light Control Member”.

D. Next, the window with a light control layer of the present invention will be described. The window with a light control layer of the present invention is a window with a light control layer having at least a window material, an adhesive layer disposed on one surface of the window material, and a light control layer disposed on the adhesive layer. The light control layer is the one described in the above-mentioned “A. Light control member”.

The window with a light control layer of the present invention will be described with reference to the drawings. FIG. 10 is a schematic sectional view showing an example of the window with a light control layer of the present invention. The window 50 with a light control layer of the present invention includes, from the light L incident side, a window material 41, an adhesive layer 42 disposed on one surface of the window material 41, and a light control layer disposed on the adhesive layer 42. 20 '.
The light control layer in FIG. 14 includes a light transmissive portion that is a high refractive index layer, a filling layer that is a low refractive index layer filled in a plurality of grooves formed on one surface of the light transmissive portion, and an optical control layer. In the first region located on the upper side during use, the groove portion has an opening on the incident surface side, and in the second region located on the lower side, the groove portion has an opening on the emission surface side. Since this is the same as the light control member in the louver mode shown in FIG. 5 described above, description thereof is omitted here.

  According to the present invention, the light control layer disposed on one surface of the window member has the same structure as that of the above-described light control member. Therefore, the light deflection angle can be changed for each region, and the lighting is performed. It becomes possible to exhibit both the illuminance improvement using the function and the anti-glare function.

  Hereinafter, the details of the window with a light control layer of the present invention will be described.

1. Light Control Layer The light control layer in the present invention is disposed on the adhesive layer disposed on one surface of the window material, and is described in the above-mentioned “A. Light control member”. It is what.
The details of the light control layer are the same as those described in the section “A. Light Control Member”, and thus the description thereof is omitted here.
The light control layer may be the daylighting sheet described in the section “C. Daylighting sheet”.

2. Window material In this invention, a window material is normally arrange | positioned rather than the light control layer at the light source side, such as the sun. That is, it is arranged on the incident surface side of the light control layer.
The window material in the present invention is not particularly limited as long as it has a high light transmittance and is generally used. Further, the window material may be colorless or colored as long as it has optical transparency.
Examples of such window materials include acrylic, polycarbonate, and glass.

3. Adhesive layer The adhesive layer in this invention is arrange | positioned on one surface of a window material, and bonds a window material and a light control layer.
The pressure-sensitive adhesive layer is not particularly limited as long as it has high light transmittance. For example, the pressure-sensitive adhesive layer described in the above-mentioned section “A. Light control member” can be used.

4). Others The present invention may have an arbitrary member in addition to the light control layer, the adhesive layer, and the window material described above.

  The window with a light control layer of the present invention preferably has high light transmittance, and specifically, it preferably exhibits the visible light transmittance of the light control member described in the section “A. Light control member”.

  The present invention is not limited to the above embodiment. The above-described embodiment is an exemplification, and the present invention has substantially the same configuration as the technical idea described in the claims of the present invention, and any device that exhibits the same function and effect is the present invention. It is included in the technical scope of the invention.

  Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples.

[Example 1]
An evaluation sample having a louver-type light control member was obtained by the following method.

(1) Preparation of composition for forming light transmitting portion First, bisphenol A ethylene oxide, xylylene diisocyanate, phenoxyethyl acrylate, 2-hydroxyethyl acrylate and bismuth tri (2-ethylhexanoate) are mixed at 30: 15: 50: 5: The mixture was mixed at 0.02 and reacted at 80 ° C. for 10 hours to obtain a photocurable prepolymer (P1).
On the other hand, bisphenol A ethylene oxide, isophorone diisocyanate, phenoxyethyl acrylate, and bismuth tri (2-ethylhexanoate) were mixed at 30: 20: 50: 0.02 and reacted at 80 ° C. for 10 hours to produce a photocurable prepolymer. (P2) was obtained.
Next, 30 parts by mass of the photocurable prepolymer (P1), 30 parts by mass of the photocurable prepolymer (P2), 10 parts by mass of phenoxyethyl acrylate as the reactive dilution monomer (M1), the reactive dilution monomer 30 parts by mass of bisphenol A ethylene oxide as (M2), 0.03 parts by mass of phosphate ester of 10 mol of tetradecanol ethylene oxide as mold release agent (S1), mold release agent (S2) 0.03 part by mass of stearylamine ethylene oxide 15 mol adduct as 1 part, and 1 part by weight of 1-hydroxycyclohexyl phenyl ketone (trade name: Irgacure 184, manufacturer name: BASF) as a photopolymerization initiator (I1), It homogenized and the composition for light transmissive part formation was obtained.
The composition for forming a light transmitting part was applied at a thickness of 100 μm, and the composition for forming a light transmitting part was cured by irradiating an ultraviolet ray of 800 mJ / cm ² with a high-pressure mercury lamp, and a multi-wavelength Abbe refractometer ( Using a product of Atago Co., Ltd.), a refractive index of 589 nm was measured and found to be 1.550.

(2) Preparation of base material A PET film (trade name: A4300, manufactured by Toyobo Co., Ltd., thickness: 100 μm) was prepared as the base material.

(3) Production of mold roll The mold roll was cylindrical and was plated with copper, and the copper plated part was cut with a cutting tool to form a groove corresponding to the light transmitting part. A diamond tool was used as the tool. Grooves were formed by cutting the outer periphery of the copper plating layer of the mold roll at a predetermined pitch in the roll axis direction. The cut roll was chrome plated.

(4) Formation of light transmission part (high refractive index layer) The said base material was conveyed between the produced die roll and nip roll. In accordance with the conveyance of the base material, the composition for forming a light transmission part is supplied from the supply device onto the base material, and light is transmitted between the base material and the mold roll by the pressing force between the mold roll and the nip roll. The composition for part formation was filled. Then, 800 mJ / cm < ² > of ultraviolet rays were irradiated from the base material side with the high pressure mercury lamp, the light transmissive part formation composition was hardened, and the light transmissive part was formed. Thereafter, the sheet was released from the mold roll by a peeling roll, and a sheet-like intermediate member having a light transmission part formed on the substrate was produced.

(5) Preparation of filled layer forming composition 42 parts by mass of urethane acrylate as photocurable prepolymer (P3), 18 parts by mass of epoxy acrylate as photocurable prepolymer (P4), reactive dilution monomer (M3) 35 parts by weight of tripropylene glycol diacrylate as a reactive monomer, 5 parts by weight of methoxytriethylene glycol acrylate as a reactive diluent monomer (M4), 5 parts by weight of titanium oxide as a light scattering agent (D1), a photopolymerization initiator 7 parts by mass of 1-hydroxycyclohexyl phenyl ketone (trade name: Irgacure 184, manufacturer name: BASF) as (I1) was mixed and homogenized to obtain a composition for forming a packed bed.
The components excluding the light scattering agent of the composition for forming a filling layer were applied at a thickness of 100 μm and cured by irradiating with an ultraviolet ray of 800 mJ / cm ² with a high-pressure mercury lamp, and a multi-wavelength Abbe refractometer (stock) The refractive index of 589 nm was measured using a product of Atago Co., Ltd. and found to be 1.490.

(6) Formation of filling layer The composition for forming a filling layer was supplied from a supply device onto the intermediate member. In addition, the filling layer forming composition supplied on the intermediate member is filled into the groove formed on one surface of the light transmitting portion using a doctor blade arranged substantially perpendicular to the traveling direction of the intermediate member. At the same time, the surplus composition for forming the packed bed was scraped off. Thereafter, the filling layer forming composition was cured by irradiating with 800 mJ / cm ² of ultraviolet rays with a high-pressure mercury lamp to form a filling layer. In this state, a recess having a depth of 6 μm was generated on the surface of the packed layer. When the above process was performed once more, a depression having a depth of 3 μm was generated on the surface of the packed bed.

  By the above procedure, a louvered sheet having a light transmission part and a filling layer was obtained. The shape of the louvered sheet is shown in FIG. 11A, and the dimensions and angles are shown in Table 1.

(7) Formation of adhesive layer composition 100 parts by mass of an acrylic resin adhesive (trade name: SK Dyne 2094, Soken Chemicals Co., Ltd., solid content 25.0%, solvents are ethyl acetate and methyl ethyl ketone), and a crosslinking agent (E-5XM, L-45, Soken Chemical Co., Ltd., solid content 5.0%) 0.28% by mass, 1,2,3-benzotriazole 0.25 parts by mass, diluent solvent (toluene / 32.0 parts by mass of methyl ethyl ketone / cyclohexanone = 27.69 g / 27.69 g / 4.61 g) was mixed to obtain an adhesive layer composition.
In the preparation of the sample for evaluation described later, when the refractive index of 589 nm was measured using a multiwavelength Abbe refractometer DR-M4 (manufactured by Atago Co., Ltd.) for the adhesive layer formed by the adhesive layer composition, 1.490. Moreover, the storage elastic modulus of this adhesion layer was 0.22 MPa.

(8) Preparation of sample for evaluation On the upper half (upper side) of one surface of the window material arranged so as to be perpendicular to the ground, the surface having the light transmission part and the filling layer of the louver type sheet is defined as the window material. The upper surface area was formed by bonding the adhesive layer through the adhesive layer made of the adhesive layer composition so that the total reflection interface had a low emission angle interface.
Similarly, in the lower half (lower side) of the same surface of the window material, the base surface of the louvered sheet is used as a bonding surface with the window material, and the total reflection interface has a high emission angle interface. Bonding was performed to form a lower side region.
Thus, an evaluation sample including a louver type light control member having an upper side region and a lower side region was obtained. FIG. 11B shows a schematic sectional view of the evaluation sample of the example. In addition, the code | symbol of FIG. 11 is the same as the code | symbol of FIGS. 1-10 mentioned above.

[Reference example]
The sample for evaluation which does not paste a louver type sheet on a window material was obtained.

[Comparative Example 1]
A louver-type sheet was bonded to the entire surface of one surface of the window material in the same manner as the method for forming the upper region in Example 1 to obtain an evaluation sample. In other words, the light control member in Comparative Example 1 was composed only of the upper region of Example 1.

[Comparative Example 2]
A louver-type sheet was bonded to the entire surface of one surface of the window material in the same manner as the method for forming the lower region in Example 1 to obtain an evaluation sample. In other words, the light control member in Comparative Example 2 was composed only of the lower region of Example 1.

[Evaluation]
For each sample for evaluation of Example 1, Comparative Examples 1 and 2, and Reference Example, light was projected under the following projection conditions, and antiglare evaluation and lighting evaluation were measured by the following methods. The results are shown in Table 2.

(Light projection conditions)
White light was projected at predetermined incident angles θ _inA and θ _inB by a light source (metal halide fiber light source, IMH-250, Sigma Kogyo Co., Ltd.). The illuminance of the light source was adjusted to 500 lx using an illuminometer (T-1H, Konica Minolta Optics, Inc.).
The incident angles θ _inA and θ _inB of the white light are the incident angles at the lowest south-medium altitude of the year (θ _inA = 31 °) and the highest south-middle altitude of the year. The incident angle at (θ _inB = 78 °).
Further, the traveling angle θ _PH of the light traveling through the light transmission part is 19.4 ° at the incident angle θ _inA and 39.1 ° at the incident angle θ _inB from the above-described equation (1). . In the formula (1), the value of N ₀ was 1.00.

(Lighting evaluation)
A luminance meter (LS-110, Konica Minolta Optics Co., Ltd.) was installed before the light was incident on the evaluation sample and after the light was incident, the respective luminances were measured, and the lighting efficiency was calculated from the luminance ratio. The daylighting efficiency of the example was set as ◯, if it was equivalent to this, it was marked as ◯, and if it was lower, it was marked as x.

(Anti-glare evaluation)
Anti-glare evaluation was made by subjectively evaluating the glare caused by direct light. The level at which it was not dazzling was rated ◎, the level at which it was not dazzling was rated as ○, and the level at which it was felt that it was impossible to see directly was marked as x.

In the sample for evaluation of the example, it was confirmed that the sample was bright up to and far from the sample for evaluation, the illuminance was improved over a wide range, and the antiglare effect was also confirmed.
On the other hand, in the sample for evaluation of Comparative Example 1, it was confirmed that the sample was bright upright and far away and the illuminance was improved over a wide range, but the antiglare effect was not confirmed.
Further, in the evaluation sample of Comparative Example 2, the illuminance near the evaluation sample was improved, but the illuminance in the distance was not improved. Moreover, although the improvement of anti-glare property was seen a little, it was not the level which is not dazzling enough.
In the evaluation sample of the reference example, the illuminance did not improve immediately above or far away, and the antiglare property was not confirmed.

1A, 11A ... 1st area | region (upper side area | region)
1B, 11B ... 2nd area | region (lower side area | region)
2 ... High refractive index layer 3 ... Low refractive index layer 5 ... Incident surface 6 ... Outgoing surface 10, 20, 20 '... Light control member (light control layer)
DESCRIPTION OF SYMBOLS 12 ... Light transmission part 13 ... Filling layer 14 ... Groove part 21 ... Screen base material 21, 32, 42 ... Adhesive layer 30 ... Roll screen 31 ... Base material 40 ... Daylighting sheet 41 ... Window material 50 ... Window X with light control layer ... One side Y ... the other side

Claims (7)

A high refractive index layer, and a low refractive index layer having a lower refractive index than the high refractive index layer,
The high-refractive index layer and the low-refractive index layer are an incident surface that is a surface on which light is incident, and an output surface that is a surface on the side from which the light is emitted and is opposed to the incident surface. Between the high refractive index layer and the low refractive index layer, a different refractive index interface, or an extended surface of the different refractive index interface is arranged so as to intersect the exit surface and the incident surface,
It has at least a first region disposed on one side in a direction parallel to the incident surface and the exit surface, and a second region disposed on the other side in a direction parallel to the incident surface and the exit surface. A light control member,
In the first region, the total reflection interface, which is the different refractive index interface where the high refractive index layer is located on the one side, has an acute angle with respect to the incident surface on the low refractive index layer side. Having a low emission angle interface formed in
In the second region, the total reflection interface has a high emission angle interface formed such that an angle on the low refractive index layer side with respect to the incident surface is an obtuse angle. A filling layer formed by filling a material having a refractive index different from that of the light transmission portion in a light transmission portion formed of a transparent resin and a plurality of grooves formed on one surface of the light transmission portion;
2. The light control member according to claim 1, wherein one of the filling layer and the light transmission portion located between the filling layers is the high refractive index layer and the other is the low refractive index layer. The filling layer is a low refractive index layer, and the light transmission portion located between the filling layers is a high refractive index layer;
3. The light control member according to claim 2, wherein the groove portion has an opening portion on the incident surface side in the first region, and the groove portion has an opening portion on the emission surface side in the second region. .   The light control member according to any one of claims 1 to 3, wherein the total reflection interface has a multistage shape including a plurality of surfaces having different angles with respect to the incident surface. A roll screen having at least a screen substrate, an adhesive layer disposed on one surface of the screen substrate, and a light control member disposed on the adhesive layer,
The light control member has a high refractive index layer, and a low refractive index layer having a refractive index lower than that of the high refractive index layer,
The high-refractive index layer and the low-refractive index layer are an incident surface that is a surface on which light is incident, and an output surface that is a surface on the side from which the light is emitted and is opposed to the incident surface. Between the high refractive index layer and the low refractive index layer, a different refractive index interface, or an extended surface of the different refractive index interface is arranged so as to intersect the exit surface and the incident surface,
It has at least a first region disposed on one side in a direction parallel to the incident surface and the exit surface, and a second region disposed on the other side in a direction parallel to the incident surface and the exit surface. Is,
In the first region, the total reflection interface, which is the different refractive index interface where the high refractive index layer is located on the one side, has an acute angle with respect to the incident surface on the low refractive index layer side. Having a low emission angle interface formed in
In the second region, the total reflection interface has a high exit angle interface formed such that an angle on the low refractive index layer side with respect to the incident surface is an obtuse angle. A daylighting sheet having at least a base material and a light control member disposed on one surface of the base material,
The light control member has a high refractive index layer, and a low refractive index layer having a refractive index lower than that of the high refractive index layer,
The high-refractive index layer and the low-refractive index layer are an incident surface that is a surface on which light is incident, and an output surface that is a surface on the side from which the light is emitted and is opposed to the incident surface. Between the high refractive index layer and the low refractive index layer, a different refractive index interface, or an extended surface of the different refractive index interface is arranged so as to intersect the exit surface and the incident surface,
It has at least a first region disposed on one side in a direction parallel to the incident surface and the exit surface, and a second region disposed on the other side in a direction parallel to the incident surface and the exit surface. Is,
In the first region, the total reflection interface, which is the different refractive index interface where the high refractive index layer is located on the one side, has an acute angle with respect to the incident surface on the low refractive index layer side. Having a low emission angle interface formed in
In the second region, the total reflection interface has a high emission angle interface formed such that an angle on the low refractive index layer side with respect to the incident surface is an obtuse angle. A window with a light control layer having at least a window material, an adhesive layer disposed on one surface of the window material, and a light control layer disposed on the adhesive layer,
The light control layer has a high refractive index layer and a low refractive index layer having a refractive index lower than that of the high refractive index layer;
The high-refractive index layer and the low-refractive index layer are an incident surface that is a surface on which light is incident, and an output surface that is a surface on the side from which the light is emitted and is opposed to the incident surface. Between the high refractive index layer and the low refractive index layer, a different refractive index interface, or an extended surface of the different refractive index interface is arranged so as to intersect the exit surface and the incident surface,
It has at least a first region disposed on one side in a direction parallel to the incident surface and the exit surface, and a second region disposed on the other side in a direction parallel to the incident surface and the exit surface. And
In the first region, the total reflection interface, which is the different refractive index interface where the high refractive index layer is located on the one side, has an acute angle with respect to the incident surface on the low refractive index layer side. Having a low emission angle interface formed in
In the second region, the total reflection interface has a high exit angle interface formed such that an angle on the low refractive index layer side with respect to the incident surface is an obtuse angle. window.

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