JP2015078492A - Panel member and optical device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a panel member which can efficiently direct at least portion of incident light toward a specific direction.SOLUTION: A panel member 20 includes a light control sheet 40 having a first surface 41 and a second surface 42 arranged so as to face each other. The second surface of the light control sheet includes a plurality of first inclined surfaces 61, a plurality of second inclined surfaces 62, and a plurality of third inclined surfaces 63 arranged in one direction. The first inclined surfaces, the second inclined surfaces and the third inclined surfaces are arranged repeatedly in the one direction in this order. Portion of light incident on the first surface of the light control sheet from one incident direction is totally reflected on the first inclined surface to advance toward the second inclined surface adjacent to the first inclined surface, then totally reflected on the second inclined surface to advance toward the third inclined surface adjacent to the second inclined surface, and totally reflected on the third inclined surface.

Description

  The present invention relates to a panel member that changes the traveling direction of light.

  Conventional panel members such as building material interior sheets have a unique texture and texture by adjusting the ratio of specular reflection (regular reflection) and diffuse reflection (see Patent Document 1). For example, if the sheet surface is flat, the tendency of specular reflection becomes strong, and if unevenness is provided on the sheet surface, the tendency of diffuse reflection can be strengthened.

JP 2011-73207 A

  However, since the conventional panel member regularly reflects or diffusely reflects incident light, it is difficult to efficiently direct light in a desired direction. For example, in many cases, light enters a panel member installed on a wall such as a building material interior sheet from above. At this time, the specularly reflected light travels downward and does not travel toward the observer. Therefore, it is difficult to utilize the specularly reflected light component of the light incident from above for any effect that can be visually recognized by the observer.

  On the other hand, if at least a part of the incident light to the panel member can be directed to a specific direction other than the regular reflection direction, the light directed to the specific direction can be used for illumination, design imparting, or the like. . That is, the present invention has been made in consideration of the above points, a panel member capable of efficiently directing at least a part of incident light in a specific direction, and a decorative board including the panel member and An object is to provide an optical device.

The panel member according to the present invention comprises:
Comprising a light control sheet having a first surface and a second surface disposed opposite to each other;
The second surface of the light control sheet includes a plurality of first inclined surfaces arranged in one direction, a plurality of second inclined surfaces arranged in the one direction, and a plurality of second inclined surfaces arranged in the one direction. 3 inclined surfaces,
The first inclined surface, the second inclined surface, and the third inclined surface are repeatedly arranged in the one direction in this order,
A part of light incident from the incident direction on the first surface of the light control sheet is totally reflected by the first inclined surface and proceeds toward the second inclined surface adjacent to the first inclined surface. Next, the light is totally reflected by the second inclined surface, proceeds toward the third inclined surface adjacent to the second inclined surface, and then totally reflected by the third inclined surface.

  In the panel member according to the present invention, all of the light entering the first surface of the light control sheet from the certain incident direction and traveling to the first inclined surface is totally reflected by the first inclined surface and the first Proceeding toward the second inclined surface adjacent to the first inclined surface, then proceeding toward the third inclined surface adjacent to the second inclined surface after total reflection at the second inclined surface, You may make it totally reflect in a 3rd inclined surface.

  In the panel member according to the present invention, an angle formed by the third inclined surface with respect to the second inclined surface may be equal to or greater than an angle formed by the second inclined surface with respect to the first inclined surface.

  In the panel member according to the present invention, an angle formed by the third inclined surface with respect to the second inclined surface may be the same as an angle formed by the second inclined surface with respect to the first inclined surface. .

  In the panel member according to the present invention, in the cross section parallel to both the normal direction and the one direction of the light control sheet, the length of the third inclined surface is not less than the length of the second inclined surface, and The length of the second inclined surface may be greater than or equal to the length of the first inclined surface.

  In the panel member according to the present invention, in the cross section parallel to both the normal direction and the one direction of the light control sheet, the length of the first inclined surface, the length of the second inclined surface, and the third The length of the inclined surface may be the same.

In the panel member according to the present invention, the light control sheet further includes a plurality of fourth inclined surfaces arranged in the one direction,
The first inclined surface, the second inclined surface, the third inclined surface and the fourth inclined surface are repeatedly arranged in the one direction in this order,
The part of the light incident on the first surface of the light control sheet from the certain incident direction is totally reflected by the first inclined surface and directed toward the second inclined surface adjacent to the first inclined surface. Next, it is totally reflected by the second inclined surface and proceeds toward the third inclined surface adjacent to the second inclined surface, and then totally reflected by the third inclined surface and the third inclined surface. You may make it advance toward the said 4th inclined surface adjacent to an inclined surface, and to totally reflect in the said 4th inclined surface next.

In the panel member according to the present invention,
The light control sheet further includes a plurality of auxiliary inclined surfaces arranged in the one direction,
The auxiliary inclined surface, the first inclined surface, the second inclined surface, and the third inclined surface are repeatedly arranged in the one direction in this order,
In a cross section parallel to both the normal direction and the one direction of the light control sheet, the angle formed by the auxiliary inclined surface with respect to the normal direction is defined by the first inclined surface with respect to the normal direction. Smaller than the angle,
If it is assumed that the auxiliary inclined surface is not provided and an extended portion of the first inclined surface extends at the position of the auxiliary inclined surface in the one direction, the first inclined surface is located on the first surface of the light control sheet. The light incident from the incident direction and traveling to the extension portion may be totally reflected by the extension portion and then directed to a position other than the second inclined surface of the second surface.

  In the panel member according to the present invention, an angle formed by the auxiliary inclined surface with respect to the normal direction in a cross section parallel to both the normal direction and the one direction of the light control sheet is the first direction of the light control sheet. The traveling direction of light incident on one surface from the certain incident direction and traveling toward the first inclined surface may be greater than or equal to the angle formed with respect to the normal direction.

In the panel member according to the present invention, in a cross section parallel to both the normal direction and the one direction of the light control sheet, an angle θ _ax formed by the auxiliary inclined surface with respect to the normal direction is equal to that of the light control sheet. The following relationship may be satisfied with respect to the incident angle θ _p1 when entering the first surface from the certain incident direction and the refractive index n _{1 of the} portion forming the auxiliary inclined surface of the light control sheet. Good.
θ _ax ≧ Arcsin ((sin θ _p1 ) / n ₁ )

In the panel member according to the present invention,
A light reflecting sheet disposed to face the second surface of the light control sheet;
A bonding layer provided between the light control sheet and the light reflection sheet and bonding the light control sheet and the light reflection sheet; and
The bonding layer may have a lower refractive index than the light control sheet.

  In the panel member according to the present invention, each first inclined surface extends in a direction non-parallel to the one direction, each second inclined surface extends in a direction non-parallel to the one direction, and a third inclined surface is You may extend in the direction non-parallel to one direction.

  In the panel member according to the present invention, the plurality of first inclined surfaces are arranged to be parallel to each other, the plurality of second inclined surfaces are arranged to be parallel to each other, and the plurality of third inclined surfaces are arranged. May be arranged parallel to each other.

  In the panel member according to the present invention, the light control sheet includes a sheet-like main body portion and a plurality of unit elements provided on the main body portion and arranged in the one direction, and each unit element is The first inclined surface, the second inclined surface, and the third inclined surface may be included one by one.

  In the panel member according to the present invention, each unit element may extend in a direction non-parallel to the one direction.

  In the panel member according to the present invention, the plurality of unit elements may have the same shape.

The cosmetic material according to the present invention comprises:
Any of the panel members according to the invention described above;
A visual effect processing member disposed to face the panel member,
The visual effect processing member has light permeability and is subjected to visual effect processing.

An optical device according to the present invention comprises:
Any of the panel members according to the invention described above;
A light source that projects light onto the panel member.

  In the optical device according to the present invention, the light source may project light onto the panel member from a direction inclined from the one side to the other side in the one direction toward the panel member.

  According to the present invention, it is possible to efficiently direct at least a part of incident light in a desired direction.

FIG. 1 is a diagram for explaining an embodiment according to the present invention, and schematically showing an optical device and a panel member. FIG. 2 is a longitudinal sectional view of the panel member of FIG. FIG. 3 is a perspective view showing the panel member of FIG. FIG. 4 is an enlarged view of FIG. 2 and is a view for explaining the operation of the panel member. FIG. 5 is a view showing a modification of the panel member in the same cross section as FIG. FIG. 6 is a diagram showing an example of a decorative material in the same cross section as FIG. FIG. 7 is a view showing another example of the decorative material in the same cross section as FIG.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings attached to the present specification, for the sake of illustration and ease of understanding, the scale, the vertical / horizontal dimension ratio, and the like are appropriately changed and exaggerated from those of the actual product.

  1 to 3 are diagrams for explaining an embodiment according to the present invention. Among these, FIG. 1 is a schematic diagram showing an optical device including a panel member. 2 and 3 are longitudinal sectional views and perspective views showing the panel member, respectively. FIG. 4 is a cross-sectional view for explaining the operation of the panel member. 2 and 4 show cross sections taken along line XX in FIG.

  The optical device 10 and the panel member 20 according to the present embodiment described below are used as a lighting device, for example. The panel member 20 is used as a wall material, for example, a building material interior sheet, and changes the traveling direction of light from the light source 15.

In particular, the panel member 20 is directed in a direction different from the specular reflection direction d _{s on} the incident surface of the panel member 20 by totally reflecting a part of the light incident on the panel member 20 as described later. Can do. Therefore, the optical device 10 as the illumination device can be configured to advance a part of the light projected from the light source 15 to the panel member 20 toward a predetermined position by changing the optical path in the panel member 20. For example, if a part of the light source light advances toward a specific region or position by the optical path changing function in the panel member 20, the desired distribution can be achieved without increasing the total light amount projected from the light source 15. Illumination with light can be realized. That is, according to the optical device 10 and the panel member 20, it is possible to realize energy saving by effectively using the light from the light source 15.

  However, the following description is only an example, and the optical device 10 and the panel member 20 are used for applications other than the lighting device, for example, a ceiling material that can emit light, a floor material, and a display device for displaying information. It is also possible to use it. In particular, when the optical device 10 is used as a display device, it is very preferable if the light source light incident on the panel member 20 can be directed to the observer of the display device by the panel member 20. In this case, the brightness of the image sensed by the observer can be effectively improved by increasing the output of the light source, in other words, by effectively using the light source light.

  In the present specification, terms such as “sheet”, “film”, and “plate” are not distinguished from each other only based on the difference in names. Therefore, for example, a “sheet” is a concept including a member that can also be called a film or a plate. As a specific example, the “light control sheet” includes members called “light control film” and “light control plate”, and the “light reflection sheet” includes “light reflection film” and “light reflection plate”. And so on.

  In this specification, “sheet surface (film surface, plate surface)” is the same as the planar direction of the target sheet-like member when the target sheet-like member is viewed as a whole and globally. It refers to the surface to be used. In the embodiment described below, the panel surface of the panel member 20, the sheet surface of the light reflecting sheet 30 described later, the sheet surface of the light control sheet 40 described later, the first surface 41 of the light control sheet 40, and the main body 50. The sheet surface, the first surface 51 of the main body 50 and the second surface 52 of the main body 50 are parallel to each other.

  Furthermore, in this specification, the “normal direction” used for the sheet-like member refers to the normal direction to the sheet surface of the sheet-like member. Therefore, in the embodiment described below, the normal direction of the panel member 20 is the normal direction of the light reflecting sheet 30 and the normal direction of the light control sheet 40, and the normal direction of the first surface 41 of the light control sheet 40. It is parallel to the normal direction of the main body 50, the normal direction of the first surface 51 of the main body 50, and the normal direction of the second surface 52 of the main body 50.

  Hereinafter, configurations and operational effects of the optical device 10 and the panel member 20 according to the present embodiment will be described in detail. As shown in FIGS. 1 and 2, the optical device 10 includes a panel member (panel member) 20 and a light source 15 that projects light onto the panel member 20. The panel member 20 includes a light control sheet 40 having a first surface 41 and a second surface 42 disposed to face each other, and a light reflection sheet 30 disposed to face the second surface 42 of the light control sheet 40. And a bonding layer 35 for bonding the light control sheet 40 and the light reflecting sheet 30.

  In the example shown in FIG. 1, the panel member 20 is provided as a wall material in a room of a building, and is arranged so that the panel surface of the panel member 20 extends in the vertical direction. On the other hand, the light source 15 is attached to the ceiling in the room of the building. Therefore, as shown in FIG. 1, the light projected from the light source 15 enters each position of the panel member 20 from a direction inclined to one side with respect to the normal direction of the panel member 20. . As the light source 15 of the optical device 10, various light sources, for example, a fluorescent lamp such as a linear cold cathode tube, a spot LED (light emitting diode), an incandescent light bulb, and the like can be used.

  Next, the panel member 20 will be described. As described above, the panel member 20 includes the light control sheet 40 having the first surface 41 and the second surface 42 disposed to face each other, and the light disposed to face the second surface 42 of the light control sheet 40. The reflection sheet 30 and the bonding layer 35 for bonding the light control sheet 40 and the light reflection sheet 30 are provided. As shown in FIG. 2, the light reflecting sheet 30 is arranged on the opposite side to the indoor space where the light source 15 and the observer are located with respect to the light control sheet 40 in the normal direction nd of the panel member 20. Therefore, as shown in FIG. 2, the light L <b> 22 from the light source 15 passes through the light control sheet 40 and enters the light reflecting sheet 30.

  The light reflecting sheet 30 is a sheet-like member having a reflecting function of reflecting incident light. The reflection characteristics of the light reflecting sheet 30 may be diffuse reflection or specular reflection. When the reflection characteristic of the light reflecting sheet 30 is diffuse reflection, the diffusion characteristic may be isotropic diffusion or directional diffusion. Therefore, various reflection sheets can be used as the light reflection sheet 30, but in the present embodiment, a white resin sheet having an isotropic diffuse reflection function is used.

  When the panel member 20 is used as a wall material as in the present embodiment, a pattern may be formed on the surface of the light reflecting sheet 30 facing the light control sheet 40. As a pattern formed on the light reflecting sheet 30, a pattern similar to the other wall portion of the room in which the panel member 20 is provided, and as a specific example, a woodgrain pattern can be employed. In addition, as a specific example of a design having design properties, a picture-like design may be employed. Note that the pattern used in the present specification is not limited to the one indicating specific information or meaning the specific information, but is particularly limited to a figure, a character, a pattern, a pattern, a symbol, a pattern, a mark, a color, and the like. Including widely without.

  The bonding layer 35 is a layer that bonds the light reflecting sheet 30 and the light control sheet 40. As shown in FIG. 2, the light reflecting sheet 30 is disposed away from the light control sheet 40 along the normal direction nd of the panel member 20. The bonding layer 35 is disposed between the light reflection sheet 30 and the light control sheet 40 as a layer adjacent to the light reflection sheet 30 and the light control sheet 40. Light L <b> 22 (see FIG. 2) that travels toward the light reflecting sheet 30 passes through the bonding layer 35. Therefore, the bonding layer 35 has visible light permeability.

  Further, the bonding layer 35 forms an interface with the light reflecting sheet 30. As will be described later, the optical path control function of the light control sheet 40 is exhibited due to reflection at the interface between the light control sheet 40 and the bonding layer 35, particularly total reflection due to the difference in refractive index. For this reason, the refractive index of the bonding layer 35 is lower than the refractive index of the light control sheet 40. The difference in refractive index at the interface between the bonding layer 35 and the light control sheet 40 is preferably 0.16 or lower. For example, the bonding layer 35 can be formed as a cured product of an ultraviolet curable resin containing silicone or fluorine.

Next, the light control sheet 40 will be described. As shown in FIG. 1 to FIG. 3, a sheet-like main body 50 and a plurality of unit elements 60 arranged on the main body 50 along a first direction d ₁ extending on the main body 50 are provided. ing.

  The main body 50 is a layer that supports the unit element 60 and is appropriately configured so as to have appropriate strength and appropriate visible light transmittance. The main body 50 has a first surface 51 and a second surface 52 as a pair of main surfaces parallel to each other. The unit element 60 is provided on the second surface 52 of the main body 50. On the other hand, the first surface 51 of the main body 50 forms the first surface 41 of the light control sheet 40. The first surface 41 of the light control sheet 40 (the first surface 51 of the main body 50) is a surface facing the room side where the observer is present, and forms an incident surface on which the light projected from the light source 15 is incident. The first surface 41 of the light control sheet 40 (the first surface 51 of the main body 50) also functions as an emission surface when changing the traveling direction of the light from the light source 15 and emitting the light. When the panel member 20 is used as a wall material as in the present embodiment, the first surface 51 of the main body 50 (the first surface 41 of the light control sheet 40) has a light diffusing function as a matte treatment. You may be comprised as a rough surface or the mat | matte surface containing the unevenness | corrugation to express.

  As an example, the thickness of the main body 50 can be 20 μm to 200 μm, and the main body 50 can be configured to include, for example, a biaxially stretched polyethylene terephthalate (PET) film. The biaxially stretched polyethylene terephthalate film is suitable for application as the main body 50 in that it has appropriate transparency and durability against ultraviolet irradiation treatment, heat treatment, and the like.

Next, the plurality of unit elements 60 provided on the second surface 52 of the main body 50 will be described. As shown in FIG. 3, each unit element 60 extends linearly in the first direction d ₁ and the non-parallel directions. In particular, in the present embodiment, the plurality of unit elements 60 are arranged in the first direction d ₁ with a constant pitch without any gaps. Also, as best shown in FIG. 3, each of the unit element 60, along the second direction d ₂ extending parallel to the panel face of the panel member 20 and perpendicular to the first direction d _1, straight It extends. In addition, each unit element 60 is formed in a columnar shape and has the same cross-sectional shape along its longitudinal direction. Further, in the present embodiment, the plurality of unit elements 60 are configured identically.

Each unit element 60 arranged in the first direction d ₁ includes the auxiliary inclined surface 69, the first inclined surface 61, the second inclined surface 62, and the third inclined surface 63 in this order from one side in the first direction d ₁ . And have. As well shown in FIG. 2, the auxiliary inclined surface 69, the first inclined surface 61, the second inclined surface 62, and the third inclined surface 63 of each unit element 60 form the second surface 42 of the light control sheet 40. Forming. That is, on the second surface 42 of the light control sheet 40, auxiliary inclined surfaces 69, the first inclined surface 61, the second inclined surface 62 and the third inclined surface 63, to the other side from one side in the first direction _{d 1} It is repeatedly provided in this order. The plurality of auxiliary inclined surfaces 69 are arranged to be parallel to each other, the plurality of first inclined surfaces 61 are arranged to be parallel to each other, and the plurality of second inclined surfaces 62 are parallel to each other. Furthermore, the plurality of third inclined surfaces 63 are arranged so as to be parallel to each other.

In a cross section parallel to both the normal direction nd to the sheet surface of the light control sheet 40 and the first direction d ₁ (hereinafter also referred to as a main cutting surface of the light control sheet), that is, in the cross section shown in FIG. The cross-sectional shape of the unit element 60 is a polygonal shape, which is a pentagonal shape in the present embodiment. In the main cut surface of the light control sheet, the width of the unit element 60 becomes narrower as it is separated from the main body 50 along the normal direction nd of the light control sheet 40. In addition, the angles θ _a1 , θ _a2 , θ _a3 , and θ _{ax of the} angles formed by the inclined surfaces 61, 62, 63, and 69 with respect to the normal direction nd of the light control sheet 40 on the main cut surface of the light control sheet. Changes as the distance from the main body 50 increases along the normal direction nd of the light control sheet 40. In the illustrated embodiment, the connecting position of the first inclined surface 61 and the second inclined surface 62 is the tip of the unit element 60 that is farthest from the main body 50 along the normal direction nd of the light control sheet 40. I am doing. In the main cut surface of the light control sheet, the inclination angle θ _a1 of the first inclined surface 61 with respect to the normal direction nd of the light control sheet 40 is the inclination angle of the auxiliary inclined surface 69 with respect to the normal direction nd of the light control sheet 40. It is larger than θ _ax . Further, in the main cut surface of the light control sheet, the inclination angle θ _a2 of the second inclined surface 62 with respect to the normal direction nd of the light control sheet 40 is the inclination of the third inclined surface 63 with respect to the normal direction nd of the light control sheet 40. It is larger than the angle _θa3 .

As shown in FIGS. 2 and 4, a part of the light L21 and L41 incident on the first surface 41 of the light control sheet 40 from a predetermined incident direction is totally reflected by the first inclined surface 61 and Proceeding toward the second inclined surface 62 adjacent to the first inclined surface 61, then totally reflected by the second inclined surface 62 and proceeding toward the third inclined surface adjacent to the second inclined surface, In addition, the third inclined surface 63 totally reflects. The total reflection at each of the inclined surfaces 61, 62, 63 is specular reflection (that is, regular reflection). Therefore, as shown in FIG. 4, the angle formed by the inclined surfaces 61, 62, 63 and the traveling direction of the light totally reflected by the inclined surfaces 61, 62, 63 on the main cut surface of the light control sheet. _Assuming that the reflection angles θ _r1 , θ _r2 , and θ _r3 , the traveling direction of light is a double angle of the reflection angles θ _r1 , θ _r2 , and θ _{r3 due to} total reflection on the inclined surfaces 61, 62, and 63. Bend the direction of travel.

In this way, a part of the light L21 and L41 incident on the first surface 41 of the light control sheet 40 from a predetermined incident direction is reflected at least three times, so that the traveling direction is largely increased in the light control sheet 40. And the light is emitted from the panel member 20 through the first surface 41 of the light control sheet 40. As a result, in the present embodiment, the light L21 and L41 totally reflected by the third inclined surface 63 is directed toward the first surface 41 of the light control sheet 40 and is emitted from the light control sheet 40. As shown in FIG. 2, the light L21 is emitted in the first direction d with respect to the traveling direction ds on the assumption that the first surface 41 of the light control sheet 40 is specularly reflected when entering the panel member 20. ₁ is greatly inclined to one side. That is, the panel member 20 can exhibit a directional deflection function (hereinafter referred to as a “directional deflection function”) that can be distinguished from an optical path changing function based on specular reflection at the incident surface. .

In addition, some L21 and L41 of the light which entered into the 1st surface 41 of the light control sheet 40 from the predetermined incident direction return the advancing direction by three times of reflection. Therefore, it is possible to set the reflection angles θ _r1 , θ _r2 , and θ _r3 per one time to be small. In this case, even if the difference in refractive index between the light control sheet 40 and the bonding layer 35 is small as described above, a total reflection phenomenon between the light control sheet 40 and the bonding layer 35 can be caused. . Thus, a part L21, the traveling direction of L41 of the incident light to the panel member 20, the first surface 41 of the light control sheet 40 as compared to the traveling direction ds in the case of specular reflection, in the first direction d ₁ Can stand up to one side.

  Further, since the refractive index difference between the light control sheet 40 and the bonding layer 35 may be reduced to some extent, the second surface 42 of the light control sheet 40 does not need to be adjacent to an air layer having a very low refractive index. . In the present embodiment, the bonding layer 35 that forms an interface with the second surface 42 of the light control sheet 40 functions as a layer that bonds the light control sheet 40 and the light reflection sheet 30. For this reason, the panel member 20 comes to have excellent durability and high rigidity. Therefore, the panel member 20 can be suitably used as a building material interior sheet or the like, for example.

  Here, specifically, if the inclined surfaces 61, 62, 63 are designed as follows, a part of the light L21, L41 incident on the first surface 41 of the light control sheet 40 from a predetermined incident direction is Totally reflected by the first inclined surface 61 and proceeds toward the second inclined surface 62 adjacent to the first inclined surface 61, and then totally reflected by the second inclined surface 62 and the second inclined surface. It proceeds toward the adjacent third inclined surface, and then is totally reflected by the third inclined surface 63. Here, in order to facilitate understanding, it is assumed that the target lights L21 and L41 travel in parallel with the main cut surface of the light control sheet 40.

First, the reflection angle θ _r1 [unit: °] of light that enters the first surface 41 of the light control sheet 40 from a predetermined incident direction and travels to the first inclined surface 61, and the interface with the bonding layer 35 of the light control sheet 40. When the refractive index n ₁ at the formed portion and the refractive index n ₂ at the portion forming the interface with the light control sheet 40 of the bonding layer 35 satisfy the following relationship, the target lights L21 and L41 are inclined by the first inclination. Total reflection at the surface 61.
n ₁ × sin (90−θ _r1 ) ≧ n ₂
As shown in FIG. 4, when the incident angles of the target lights L21 and L41 incident on the light control sheet 40 from a specific incident direction are θ _p1 [unit: °], the reflection angle θ _r1 is as follows. It can also be expressed using the incident angle θ _p1 . The angle θ _a1 [unit: °] in the following relationship is an angle formed by the first inclined surface 61 with respect to the normal direction nd of the light control sheet, as described above.
sin θ _p1 = n ₁ × sin (θ _a1 −θ _r1 )

Next, if the reflection angle θ _r2 at the second inclined surface 62 is equal to or _smaller than the reflection angle θ _{r1 at} the first inclined surface 61, the light totally reflected by the first inclined surface 61 is totally reflected by the second inclined surface 62. Reflected. At this time, the internal angle θ _n1 [unit: °] formed by the first inclined surface 61 and the second inclined surface 62 at the main cut surface of the light control sheet satisfies the following expression.
θ _n1 ≧ 180−2 × θ _r1
In addition, when the reflection angle θ _r1 at the first inclined surface 61 is equal to the reflection angle θ _r2 at the second inclined surface 62, the length l _r2 of the second inclined surface 62 in the main cut surface of the light control sheet is If the length l _r1 of the first inclined surface 61 in the main cut surface of the light control sheet is equal to or shorter than the length l _r1 , the light enters the first surface 41 of the light control sheet 40 from a predetermined incident direction and is totally reflected by the first inclined surface 61. The lights L21 and L41 enter the second inclined surface 62 and are totally reflected.

Similarly, if the reflection angle θ _{r3 on} the third inclined surface 63 is equal to or _smaller than the reflection angle θ _{r2 on} the second inclined surface 62, the light totally reflected on the second inclined surface 62 is totally reflected on the third inclined surface 63. Reflected. At this time, the internal angle θ _n2 [unit: °] formed by the second inclined surface 62 and the third inclined surface 63 at the main cut surface of the light control sheet satisfies the following expression.
θ _n2 ≧ 180−2 × θ _r2
Further, the inner angle θ _n2 formed by the second inclined surface 62 and the third inclined surface 63 is equal to or _larger than the inner angle θ _n1 formed by the first inclined surface 61 and the second inclined surface 62. Then, the light that has undergone total reflection at the first inclined surface 61 and the second inclined surface 62 is further totally reflected at the third inclined surface 63. Further, when the reflection angle θ _r2 at the second inclined surface 62 is equal to the reflection angle θ _r3 at the third inclined surface 63, the length l _r3 of the third inclined surface 63 in the main cut surface of the light control sheet is the light If the length l _r2 of the second inclined surface 62 in the main cut surface of the control sheet is equal to or shorter than the length l _r2 , the first inclined surface 61 and the second inclined surface are incident on the first surface 41 of the light control sheet 40 from a predetermined incident direction. Lights L21 and L41 totally reflected by both 62 enter the third inclined surface 63 and are totally reflected.

In addition, by repeating total reflection on the inclined surfaces 61, 62, and 63 of the light control sheet 40, it is possible to secure more light traveling in a predetermined direction different from the direction ds that is specularly reflected on the incident surface of the panel member 20. That is, from the viewpoint of efficiently exhibiting the directional deflection function of the light control sheet 40, the first inclined surface 61 is incident on the first surface 41 of the light control sheet 40 from a specific incident direction. All of the light traveling to the first inclined surface 61 is totally reflected and travels toward the second inclined surface 62 adjacent to the first inclined surface 61, and then totally reflected by the second inclined surface 62. Thus, it is preferable to proceed toward the third inclined surface 63 adjacent to the second inclined surface 62 and then totally reflect on the third inclined surface 63. As an example, the reflection angles θ _r1 , θ _r2 , and θ _r3 at the reflecting surfaces 61, 62, and 63 are the same, and the length l of each inclined surface 61, 62, 63 at the main cutting surface of the light control sheet. _{If r1} , _lr2 , and _lr3 are the same, the light incident on the first surface 41 of the light control sheet 40 from the specific incident direction and totally reflected by the first inclined surface 61 is then the second inclined surface 62. And total reflection is repeated at the third inclined surface 63.

The panel member 20 shown in FIG. 4 has the same reflection angles θ _r1 , θ _r2 , θ _{r3 on the} reflecting surfaces 61, 62, 63, and the inclined surfaces 61 on the main cut surface of the light control sheet. , 62, 63 have the same length l _r1 , l _r2 , l _r3 . As shown by a dotted line in FIG. 4, the light advances in parallel with the main cutting surface of the light control sheet and enters the panel member 20 at an incident angle θ _p1 , and then totally reflected at one end of the first inclined surface 61. The light L42 is then totally reflected at the other end of the second inclined surface 62 and then totally reflected at one end of the third inclined surface 63. Similarly, as indicated by a two-dot chain line in FIG. 4, the light advances in parallel with the main cutting surface of the light control sheet and enters the panel member 20 at an incident angle θ _p1 , and then the other end of the first inclined surface 61. The light L43 totally reflected by the second portion is then totally reflected by one end portion of the second inclined surface 62 and then totally reflected by the other end portion of the third inclined surface 63. Of the light that travels parallel to the main cutting surface of the light control sheet and enters the panel member 20 at the incident angle θ _p1 , the light that follows the optical path between the light L42 and L43 shown in FIG. Similar to light, total reflection is repeated in turn on each of the inclined surfaces 61, 62, 63. That is, light incident from a predetermined direction in a region Z _r to be between the incident position of the incident position and the light L43 of the aforementioned light L42 of the first surface 41 of the light control sheet 40, the inclined surface 61, The total reflection is sequentially repeated at 62 and 63, and the traveling direction is turned back in a direction greatly different from the direction _ds specularly reflected on the first surface 41.

Incidentally, as described above, the second surface 42 of the light control sheet 40 further includes an auxiliary inclined surface 69 in addition to the first to third inclined surfaces 61, 62, 63. The inclination angle θ _ax of the auxiliary inclined surface 69 with respect to the normal direction nd is smaller than the inclination angle θ _a1 of the first inclined surface 61 with respect to the normal direction nd of the light control sheet 40. The auxiliary inclined surface 69 does not contribute to the directivity deflection function of the panel member 20, but is configured to satisfy the following condition. That is, assuming that if the auxiliary inclined surface 69 extension 61a of the first inclined surface 61 at the position of the auxiliary inclined surface 69 in yet not and the first direction d ₁ provided was extended, the light control sheet 40 second The light L44 (see FIG. 4) that has entered the first surface 41 from the specific incident direction and has traveled to the extension portion 61a is totally reflected by the extension portion 61a, and then the second surface 42 other than the second inclined surface 62. Head towards the position. In other words, if the extended portion 61 a of the first inclined surface 61 is provided instead of the auxiliary inclined surface 69, the light incident at the incident angle θ _{p <} b> 1 described above is second if it is totally reflected by the first inclined surface 61. Although it goes to the inclined surface 62, it goes to other than the second inclined surface 62 when it is totally reflected by the extended portion 61 a. That is, the auxiliary inclined surface 69 is provided in place of a portion of the first inclined surface 61 that does not contribute to the directivity deflection function of the panel member 20.

As described above, the auxiliary inclined surface 69 is also a surface that does not contribute to the directivity deflection function of the panel member 20. However, the auxiliary inclined surface 69 has a smaller angle with respect to the normal direction nd of the panel member 20 than the extended portion 61a. Therefore, as shown in FIG. 4, when the auxiliary inclined surface 69 is provided, the width W _a of the unit element 60 is made smaller than the width W _x of the unit element 60 when the extension portion 61a is provided. Can do. As a result, the width W _a of a unit element 60, it is possible to increase the ratio of the width of the incident region Z _r becomes as adversely directional deflecting function to light from a specific incidence direction. That is, by providing the auxiliary inclined surface 69, the directivity deflection function can be more efficiently exhibited.

In addition, if the angle θ _ax formed with respect to the normal direction nd of the auxiliary inclined surface 69 in the main cut surface of the light control sheet is reduced, a directional deflection function is exerted on light from a specific incident direction. The width of the incident region Z _r (see FIG. 4) becomes narrow. Therefore, from the viewpoint of more effectively exerting the directional deflection function, the inclination angle θ _ax (see FIG. 2) of the auxiliary inclined surface 69 with respect to the normal direction nd of the panel member 20 is determined as follows. Is preferred. That is, in the main cut surface of the light control sheet, the angle θ _ax formed by the auxiliary inclined surface 69 with respect to the normal direction nd is incident on the first surface 41 of the light control sheet 40 at an incident angle θ _p1 from the specific incident direction. Thus, the traveling direction of the light toward the first inclined surface 61 is set to be equal to or larger than the angle formed with respect to the normal direction nd. Specifically, the following relationship including the refractive index n ₁ of the light control sheet 40 is satisfied.
θ _ax ≧ Arcsin ((sin θ _p1 ) / n ₁ )
According to the auxiliary inclined surface 69 which is designed, the incidence region Z _r becomes as adversely directional deflecting function to light from a specific incidence direction can be maximally secured directional deflection It becomes possible to perform the function more efficiently.

The dimensions of the light control sheet 40 having the above configuration can be set as follows as an example. First, as a specific example of the unit element 60, the width W _a (see FIG. 4) of the unit element 60 along the sheet surface of the light control sheet 40 can be set to 0.05 mm or more and 1.00 mm or less. Moreover, the height of the unit element 60 along the normal direction nd of the light control sheet can be set to 0.03 mm or more and 1.0 mm or less. Furthermore, the thickness of the main body 50 can be set to 0.02 mm or more and 1.0 mm or less.

  Moreover, the light control sheet 40 as described above can be manufactured by shaping the unit element 60 on a base material. As the base material, a film made of a transparent resin containing at least one of acrylic, styrene, polycarbonate, polyethylene terephthalate, acrylonitrile and the like as a main component can be used. Epoxy acrylate and urethane acrylate-based reactive resins (such as ionizing radiation curable resins) can be suitably used as the material to be molded on the substrate. In an example of this manufacturing method, the main body 50 may be formed only from the base material, or may be formed from the base material and a resin portion molded in a sheet shape on the base material. It may be. However, it is not restricted to producing the light control sheet 40 by molding using a reactive resin, and the light control sheet 40 may be produced by other manufacturing methods such as extrusion molding and injection molding. In addition, in the state which laminated | stacked the light reflection sheet | seat 30 on the light control sheet | seat 40 obtained in this way through uncured ionizing-radiation-curable resin, a panel member is hardened by ionizing-radiation-curable resin 20 can be obtained. In this case, the cured product of the ionizing radiation curable resin forms the bonding layer 35.

  Next, the operation of the optical device 10 and the panel member 20 configured as above will be described. Here, the operation of the optical device 10 and the panel member 20 when the optical device 10 is used as a lighting device will be described.

In the example shown in FIGS. 1 and 2, the panel member 20 is arranged such that the first direction d _{1 that} is the arrangement direction of the unit elements 60 is parallel to the vertical direction. Therefore, the light L11 is projected from the light source 15 from a first direction inclined from one side in the direction d ₁ to the other side to the panel member 20, is incident on the position of the panel member 20.

  As shown in FIG. 2, the light beams L <b> 21 and L <b> 22 that have entered the panel member 20 enter the main body 50 that forms the outermost surface of the panel member 20 from the first surface 51 side. Lights L21 and L22 incident on the light control sheet 40 of the panel member 20 travel from the main body 50 to the unit element 60. As shown in FIG. 2, the lights L <b> 21 and L <b> 22 traveling through the unit element 60 are then incident on the second surface 42 of the light control sheet 40. The second surface 42 includes an auxiliary inclined surface 69, a first inclined surface 61, a second inclined surface 62, and a third inclined surface 63 that are inclined with respect to each other. Then, depending on which of the second surfaces 42 the light 69 from which the light from the light source 15 enters, the optical action exerted thereafter, and the traveling direction as a result, are determined. To be different.

As described above, a part of the light incident on the first surface 41 of the light control sheet 40 from the incident direction is totally reflected by the first inclined surface 61 and adjacent to the first inclined surface 61. Proceeding toward the surface 62, then totally reflected by the second inclined surface 62, proceeding toward the third inclined surface 63 adjacent to the second inclined surface 62, and then totally reflected by the third inclined surface 63 Thus, the panel member 20 is configured. The total reflection at each of the inclined surfaces 61, 62, 63 is specular reflection (that is, regular reflection). Therefore, as shown in FIG. 4, in the main cut surface of the light control sheet, the angle between the inclined surfaces 61, 62, 63 and the traveling direction of the light totally reflected by the inclined surfaces 61, 62, 63 is the reflection angle. _Assuming θ _r1 , θ _r2 , and θ _r3 , the traveling direction of the light L31 proceeds by an angle twice as large as the reflection angles θ _r1 , θ _r2 , and θ _{r3 due to} total reflection at the inclined surfaces 61, 62, and 63. Bend the direction.

In this way, among the light incident on the first surface 41 of the light control sheet 40 from the predetermined incident direction, the lights L21 and L41 directed to the first inclined surface 61 after entering the light control sheet 40 are at least three times. The traveling direction is greatly changed in the light control sheet 40 by repeating the reflection. As a result, in the present embodiment, the light L21 and L41 totally reflected by the third inclined surface 63 is directed toward the first surface 41 of the light control sheet 40 and is emitted from the light control sheet 40. As shown in FIG. 2, the emission direction of the light L <b> 21 is the first direction with respect to the direction d _s that is assumed to be specularly reflected by the first surface 41 of the light control sheet 40 when entering the panel member 20. It is largely inclined to one side in the d _1. That is, the panel member 20 can exhibit a deflecting function having directivity that can be distinguished from an optical path changing function based on specular reflection at a simple incident surface.

In the present embodiment, the panel member 20 is designed so that light incident on the panel member 20 at a predetermined incident angle θ _p1 is totally reflected in order by the first to third inclined surfaces 61, 62, 63. ing. However, the light incident on the panel member 20 at an incident angle near the predetermined incident angle is not limited to the predetermined incident angle θ _p1 strictly, and all light is incident on the first to third inclined surfaces 61, 62, and 63 in order. The light is reflected and emitted in a direction significantly different from the direction d _s that is specularly reflected by the incident surface of the panel member 20 in the same manner as the lights L21 and L41 described above.

In many applications, light from the light source 15 is incident on the panel member 20 from above, corresponding to one side in the first direction d ₁ . In this case, the direction d _{s that} is specularly reflected by the incident surface of the panel member 20 is directed to the floor surface. On the other hand, according to the present embodiment, the light L21 and L41 incident on the main body 50 of the light control sheet 40 from the light source 15 toward the first inclined surface 61 by the directional deflection function in the panel member 20 is the first. The light is emitted from the panel member 20 after being reflected by the first to third inclined surfaces 61, 62, and 63 to illuminate the room. Emission direction of the light L21, L41 is one side in the first direction d ₁ with respect to the specular reflection direction d _s, that is, the direction that rises upward in the vertical direction with respect to the specular reflection direction ds. In the illustrated example, the lights L21 and L41 travel into the room approximately along the normal direction nd of the panel member 20. Such emitted lights L21 and L41 can be effectively used as illumination light for illuminating a specific region or position in the space where the panel member 20 is installed.

That is, it is possible to effectively suppress the light from the light source 15 from being emitted in the direction d _s that is difficult to be used effectively, and to effectively use it for indoor lighting. More specifically, the directional deflection function in the panel member 20 deflects the light from the light source 15 in a direction that can effectively contribute to the increase in indoor brightness, and a specific region or position is spot-like. It can also be illuminated. Thereby, the effective use of the light from the light source 15 can be achieved, and energy saving can be realized.

On the other hand, as shown in FIG. 2, the light L22 incident on a portion other than the first inclined surface 61 of the second surface 42 of the light control sheet 40 or a specific incident direction other than the specific incident direction in which the incident angle is _θp1. Most of the light incident on the panel member 20 from the direction reaches the light reflecting sheet 30. The light is diffused and reflected by the light reflecting sheet 30, for example, is turned back and travels from the panel member 20 into the room. The texture and texture can be adjusted by combining such reflected light from the light reflecting sheet 30 and deflected light by the directional deflection function on the second surface 42 of the light control sheet 40. The ratio of the reflected light from the light reflecting sheet 30 and the deflected light by the directional deflection function on the second surface 42 of the light control sheet 40 is determined by the inclined surfaces 61 on the second surface 42 of the light control sheet 40. , 62, 63, 69 can be changed by adjusting the length.

  By the way, in this Embodiment, the pattern may be formed in the surface on the side facing the light control sheet 40 of the light reflection sheet 30. Of the light from the light source 15 incident on each position of the panel member 20 along various directions, the light that has reached the light reflecting sheet 30 illuminates this pattern. Thereby, even if the light that illuminates the panel member 20 is only the light projected from the light source 15, a person in the room can observe the pattern formed on the light reflecting sheet 30.

As described above, according to the present embodiment, part of the light L21 and L41 incident on the first surface 41 of the light control sheet 40 from the predetermined incident direction is totally reflected by the first inclined surface 61 and Proceeding toward the second inclined surface 62 adjacent to the first inclined surface 61, then totally reflected by the second inclined surface 62 and proceeding toward the third inclined surface adjacent to the second inclined surface, In addition, the third inclined surface 63 totally reflects. Due to total reflection at the inclined surfaces 61, 62, and 63, the traveling direction of the light L31 bends the traveling direction by an angle twice as large as the reflection angles θ _r1 , θ _r2 , and θ _r3 . As a result, a part of the light L21 and L41 incident on the first surface 41 of the light control sheet 40 from a predetermined incident direction is greatly reflected in the light control sheet 40 by repeating reflection at least three times. Then, the light can be emitted from the panel member 20 through the first surface 41 of the light control sheet 40. The light emission direction is greatly inclined to one side in the first direction d _{1 with} respect to the direction d _s which proceeds on the assumption that the first surface 41 of the light control sheet 40 is specularly reflected when entering the panel member 20. doing. That is, the panel member 20 exhibits a directional deflecting function that can be distinguished from the optical path changing function by specular reflection at the incident surface, and any optical function that the observer can recognize visually. Effectively enables the expression of.

Note that a part of the light L21 and L41 incident on the first surface 41 of the light control sheet 40 from a predetermined incident direction is folded back by three times of reflection. Therefore, it is possible to set the reflection angles θ _r1 , θ _r2 , and θ _r3 per one time to be small. In this case, the difference in refractive index between the light control sheet 40 and the bonding layer 35 is small as described above, and a total reflection phenomenon between the light control sheet 40 and the bonding layer 35 can be caused. Thus, a part L21, the traveling direction of L41 of the incident light to the panel member 20, the first surface 41 of the light control sheet 40 as compared to the traveling direction in the case of specular reflection, one in the first direction d ₁ Can stand up to the side.

  Further, since the refractive index difference between the light control sheet 40 and the bonding layer 35 may be reduced to some extent, the second surface 42 of the light control sheet 40 does not need to be adjacent to an air layer having a very low refractive index. . In the present embodiment, the bonding layer 35 that forms an interface with the second surface 42 of the light control sheet 40 functions as a layer that bonds the light control sheet 40 and the light reflection sheet 30. For this reason, the panel member 20 comes to have excellent durability and high rigidity. Therefore, the panel member 20 can stably exhibit the directivity deflection function and can be suitably used as, for example, a building material interior sheet.

  Furthermore, since the light control sheet 40 can be bonded to the light reflecting sheet 30 via the bonding layer 35, a large force is locally applied to the surface of the unit element 60 that forms the second surface 42 of the light control sheet 40. This can be avoided effectively. Therefore, it is not necessary to increase the size of the unit element 60 in order to give the individual unit element 60 high strength. For this reason, in this Embodiment, the unit element 60 can be reduced in size and the thickness of the light control sheet 40 and also the thickness of the panel member 20 can be reduced.

Further, in the present embodiment, the second surface 42 of the light control sheet 40 further includes an auxiliary inclined surface 69 in addition to the first to third inclined surfaces 61, 62, 63. The inclination angle θ _ax of the auxiliary inclined surface 69 with respect to the normal direction nd is smaller than the inclination angle θ _a1 of the first inclined surface 61 with respect to the normal direction nd of the light control sheet 40. Then, assuming that if the auxiliary inclined surface 69 extension 61a of the first inclined surface 61 at the position of the auxiliary inclined surface 69 in yet not and the first direction d ₁ provided was extended, the light control sheet 40 second The light L44 (see FIG. 4) that has entered the first surface 41 from the specific incident direction and has traveled to the extension portion 61a is totally reflected by the extension portion 61a, and then the second surface 42 other than the second inclined surface 62. Head towards the position. In other words, if the extended portion 61 a of the first inclined surface 61 is provided instead of the auxiliary inclined surface 69, the light incident at the incident angle θ _{p <} b> 1 described above is second if it is totally reflected by the first inclined surface 61. Although it goes to the inclined surface 62, it goes to other than the second inclined surface 62 when it is totally reflected by the extended portion 61 a. That is, the auxiliary inclined surface 69 is provided in place of a portion of the first inclined surface 61 that cannot contribute to the directivity deflection function of the panel member 20.

The auxiliary inclined surface 69 is also a surface that does not contribute to the directional deflection function of the panel member 20, but the auxiliary inclined surface 69 has a smaller angle with respect to the normal direction nd of the panel member 20 than the extension portion 61a. Accordingly, when the auxiliary inclined surface 69 is provided, the width W _a of the unit element 60 can be reduced compared to the width W _x of the unit element 60 when the extension portion 61 a is provided. As a result, the ratio of the width of the incident region Z _r (see FIG. 4) that is to have a directional deflection function with respect to light from a specific incident direction with respect to the width W _a of one unit element 60 is increased. be able to. That is, by providing the auxiliary inclined surface 69, the directivity deflection function can be more efficiently exhibited.

  Note that various modifications can be made to the above-described embodiment. Hereinafter, an example of a modification will be described.

  In the above-described embodiment, the example in which the unit elements 60 are arranged without gaps on the second surface 52 of the main body 50 has been described. May be arranged with a gap. According to this example, a part of the second surface 42 of the light control sheet 40 is configured by the second surface 52 of the main body 50.

Furthermore, in the above-described embodiment, an example of the cross-sectional shape of the unit element 60 on the main cut surface of the light control sheet has been described. However, the present invention is not limited to this, and various modifications can be made. For example, as shown in FIG. 5, the light control sheet 40, a plurality of fourth inclined surface 64 arranged in the first direction d _1, may further include. In the example shown in FIG. 5, the auxiliary inclined surface 69, the first inclined surface 61, the second inclined surface 62, the third inclined surface 63 and the fourth inclined surface 64, in this order, repeating the first direction _{d 1} It is arranged. A part L 51 of light incident on the first surface 41 of the light control sheet 40 from the incident direction is totally reflected by the first inclined surface 61 and directed toward the second inclined surface 62 adjacent to the first inclined surface 61. Next, it is totally reflected by the second inclined surface 62 and proceeds toward the third inclined surface 63 adjacent to the second inclined surface 62, and then totally reflected by the third inclined surface 63 and It proceeds toward the fourth inclined surface 64 adjacent to the third inclined surface 63, and is then totally reflected by the fourth inclined surface 64. Such a progressive deflection function in the panel member 20 is, for example, the same as in the above-described method in which the third inclined surface 63 is designed based on the first inclined surface 61 and the second inclined surface 62. This can be ensured by designing the fourth inclined surface 64 based on the third inclined surfaces 61, 62, 63. Further, the unit element 60 is not limited to the example shown in FIG. 5, and the unit element 60 has a polygonal shape other than a quadrangular shape or a pentagonal shape, for example, a triangular shape or a hexagonal shape, on the main cut surface of the light control sheet. May be.

  Furthermore, in the above-described embodiment and its modification, the example in which the second surface 42 of the light control sheet 40 has the auxiliary inclined surface 69 that does not contribute to the directional deflection function has been described, but the present invention is not limited thereto. The second surface 42 of the light control sheet 40 may include only the inclined surfaces 61, 62, and 63 that contribute to the directional deflection function, and may not include the auxiliary inclined surface 69.

Furthermore, in the above-described embodiment, the example in which the plurality of unit elements 60 are configured identically to each other has been described, but the present invention is not limited to this. Also, although an example in which a plurality of unit elements 60 are arranged in the first direction d ₁ at a constant pitch is not limited thereto. Depending on the distance along the first direction d ₁ from the light source 15, the shape of the unit elements 60, the arrangement pitch of the unit elements 60 along the sheet surface of the light control sheet 40, and the sheet surface of the light control sheet 40 The width W _a of the unit element 60 may be changed.

  Further, in the above-described embodiment, each unit element 60 extends linearly and a plurality of unit elements 60 are arranged in a one-dimensional array (linear array array). However, the present invention is not limited to this. Each unit element 60 may be formed in a dot shape, and each unit element 60 may be arranged in a two-dimensional array.

  Furthermore, in the above-described embodiment, an example in which a pattern is formed on the light reflecting sheet 30 has been described. However, a pattern may be formed in addition to the light reflecting sheet 30, and in addition to the pattern of the light reflecting sheet 30 And the pattern may be formed in the other part of the panel member 20. As an example, a pattern may be formed on the first surface 51 of the main body 50 (the first surface 41 of the light control sheet 40), or a pattern may be formed on the second surface 52 of the main body 50 of the light control sheet 40. May be.

  Furthermore, as shown in FIG. 6, it is possible to use the panel member 20 as a decorative material 13 that is combined with a visual effect processing member 80. The visual effect processing member 80 is light transmissive, and visual effect processing is performed on the surface of the member. Therefore, in the decorative material 13 including the panel member 20 and the visual effect processing member 80, the visual effect on the visual effect processing member 80 is more remarkably and more effectively exhibited by the directional deflection function on the panel member 20. Become so.

  Here, the visual effect processing refers to any processing or pattern that can be visually recognized by the observer observing the member surface, for example, applying design such as symbolic numeric character information and image information, The image information may be a monochrome grayscale image or a color image. In addition, the visual effect processing is not limited to printing on the surface of the member using a printing technique, but may provide a visual effect by forming an uneven shape on the surface of the member, or by forming optical interference fringes, The image may emerge depending on the incident angle of light.

  When the visual effect processing is performed by printing, for example, it is conceivable to perform gravure printing on the surface of the member using an amplitude modulation method in which the size of the printing dot is changed to represent light and shade. Thereby, it is possible to perform high-quality visual effect processing at a low cost in the same manner as a normal printed matter.

  The visual effect processing member 80 has a case where a visual effect is produced by the member itself and a case where a visual effect layer is laminated on the member. When the visual effect is produced by the member itself, the visual effect layer is not required and only the member is required. Examples of the member having a visual effect include polished glass, shoji, Japanese paper, a colored glass member, and a colored resin member. On the other hand, when a visual effect layer is laminated on a member, the member needs to have light permeability, and examples thereof include an inorganic member and a resin member. The inorganic member is, for example, a glass member, and soda lime glass, non-alkali glass, quartz glass, or the like can be used as the glass used therefor. Examples of the resin used for the resin member include polypropylene, polyethylene, polyvinyl chloride, polystyrene, polyvinyl alcohol, polyimide, polyethylene naphthalate, polyethylene terephthalate, polycarbonate, polyether imide, polyether ether ketone, polyether ketone, and polyphenylene. Examples thereof include sulfide, liquid crystal polymer, epoxy resin, silicone resin, phenol resin, acrylic resin, polycarbonate resin, styrene, and triacetyl cellulose (TAC).

  Further, a sheet-like electronic display member can be used as the visual effect processing member 80. FIG. 7 illustrates the decorative material 13 including the visual effect processing member 80 described above, the electronic display member 90 as the second visual effect processing member, and the panel member 20. The electronic display member 90 is disposed between the visual effect processing member 80 and the panel member 20. The electronic display member 90 of FIG. 7 is configured as electronic paper having a transparent electrode member 91, a counter electrode member 92, and a display medium layer 93. The transparent electrode member 91 includes a transparent member (not shown) and a transparent electrode (not shown) formed on the transparent member. The counter electrode member 92 includes a counter member (not shown) and a counter electrode (not shown) formed on the counter member. The display medium layer 93 includes a solvent layer 95 containing the twist ball 94 and a display medium layer member 96 that seals the twist ball 94 and the solvent layer 95.

  By providing such an electronic display member 90 as the second visual effect processing member, the visual effect by the first visual effect processing member 80 and an optional display on the second visual effect processing member (electronic display member 90) Can be provided to the observer by synthesizing with the visual effect of the display image, for example, a finer visual effect can be realized. In other words, the visual effect by the first visual effect processing member 80 is fixed (static), whereas the visual effect by the second visual effect processing member (electronic display member 90) is dynamic. For example, using the visual effect by the first visual effect processing member 80 as a background image, a moving image (for example, a clock or telop image) is displayed by the second visual effect processing member (electronic display member 90). Can be made.

  The electronic display member 90 is not limited to electronic paper, and various flat display devices such as a liquid crystal display device and an organic EL device can be applied. The image displayed on the electronic display member 90 is not necessarily a moving image, and a still image may be displayed.

  Furthermore, the solar cell panel can be laminated on the panel member 20 so as to face the first surface 41 of the light control sheet 40. In this example, electric power can be generated by light incident on the solar cell panel, the use of fossil fuel can be reduced, and energy saving can be achieved.

  In addition, although the some modification with respect to embodiment mentioned above was demonstrated above, naturally, it is also possible to apply combining several modifications suitably.

  EXAMPLES Hereinafter, although this invention is demonstrated in detail using an Example, this invention is not limited to this Example.

  The panel member of FIGS. 1 to 4 described in the above embodiment was produced. In the present embodiment, light that travels in a plane parallel to the main cutting surface of the light control sheet and enters the light control sheet 40 at an incident angle of 45 ° is totally reflected by the first inclined surface and the first inclined surface. To the second inclined surface adjacent to the second inclined surface, then totally reflected by the second inclined surface, proceeding toward the third inclined surface adjacent to the second inclined surface, and then fully reflected on the third inclined surface. It was designed to reflect and go out from the panel member 20 in the normal direction nd of the light control sheet. In the panel member according to Example 1, the refractive index of the portion that forms the interface with the bonding layer of the light control sheet is 1.59, and the refractive index of the portion that forms the interface of the bonding layer with the light control sheet is 1.41. did. In the panel member according to Example 2, the refractive index of the portion forming the interface with the bonding layer of the light control sheet is 1.59, and the refractive index of the portion forming the interface of the bonding layer with the light control sheet is 1.43. did. A white PET film having a scattering reflection function was used as the light reflecting sheet.

The obtained panel member 20 was affixed to the indoor wall, and the brightness of the surface of the panel member was measured from the normal direction of the panel member in a state where the indoor lighting was turned on. Further, as a comparative example, a commercially available wallpaper was attached to a wall of a room, and the brightness of the surface of the wallpaper was visually compared from the normal direction of the wallpaper in a state where the room lighting was turned on. The room illumination light was white light.
On the other hand, as a luminance evaluation, using a goniometer (manufactured by Murakami Color Research Laboratory Co., Ltd., three-dimensional variable angle spectroscopy system GCMS-11), the luminance Y of each panel member and the surface of the wallpaper is measured from the normal direction. did. The measurement results of the Y value are shown in Table 1 as relative ratios.

  In Example 1 and Example 2, it was confirmed that the directivity deflection function was sufficiently confirmed. In comparison between Example 1 and Example 2, a stronger directional deflection function was exhibited in Example 1 having a large refractive index difference. Furthermore, when the panel member of Example 1 and Example 2 was visually observed from the normal direction, the panel member of Example 1 was observed in white, but the panel member of Example 2 was clearly the panel of Example 1. Unlike the color of the member, it was observed pale. That is, by adjusting the difference in refractive index between the light reflecting sheet and the bonding layer, it is possible to control the color of the panel member when the panel member is observed from the deflection direction of the deflected light having the directional deflection function. did it. The refractive indexes of the light reflecting sheet and the bonding layer slightly change depending on the wavelength of light. And in the panel member 20 of Example 1 and 2, since the refractive index difference of a light reflection sheet and a joining layer is comparatively small, the light of the one part wavelength range of the incident light to a panel member is short wavelength, for example It is inferred that the side light mainly satisfies the total reflection condition at the interface between the light reflection sheet and the bonding layer and has a directional deflection function.

  Moreover, about the panel member which concerns on Example 1 and Example 2, it pressurized at normal temperature using the nip roller made from SUS which can change a pressure arbitrarily. The panel members according to Example 1 and Example 2 were able to sufficiently exhibit the directional deflection function even after being pressurized with a load of 3.5 t (300 MPa in the measurement using pressure sensitive paper). That is, it was confirmed that the panel members according to Example 1 and Example 2 have sufficient mechanical strength.

DESCRIPTION OF SYMBOLS 10 Optical device 13 Cosmetic material 15 Light source 20 Panel member 30 Light reflection sheet 35 Joining layer 40 Light control sheet, optical sheet 41 1st surface, observer side surface 42 2nd surface, back surface 50 Main-body part 51 1st surface 52 2nd surface 60 unit element, unit optical element, unit shape element 61 first inclined surface 611 extended portion 62 second inclined surface 63 third inclined surface 64 fourth inclined surface 69 auxiliary inclined surface 80 visual effect processing member, first visual effect processing Member 90 Electronic display member, second visual effect processing member

Claims (8)

Comprising a light control sheet having a first surface and a second surface disposed opposite to each other;
The second surface of the light control sheet includes a plurality of first inclined surfaces arranged in one direction, a plurality of second inclined surfaces arranged in the one direction, and a plurality of second inclined surfaces arranged in the one direction. 3 inclined surfaces,
The first inclined surface, the second inclined surface, and the third inclined surface are repeatedly arranged in the one direction in this order,
A part of light incident from the incident direction on the first surface of the light control sheet is totally reflected by the first inclined surface and proceeds toward the second inclined surface adjacent to the first inclined surface. Next, the panel member is totally reflected by the second inclined surface, proceeds toward the third inclined surface adjacent to the second inclined surface, and then totally reflected by the third inclined surface.   The panel member according to claim 1, wherein an angle formed by the third inclined surface with respect to the second inclined surface is not less than an angle formed by the second inclined surface with respect to the first inclined surface.   In a cross section parallel to both the normal direction and the one direction of the light control sheet, the length of the third inclined surface is equal to or greater than the length of the second inclined surface, and the length of the second inclined surface. The panel member according to claim 1, wherein the length is equal to or greater than a length of the first inclined surface. The light control sheet further includes a plurality of auxiliary inclined surfaces arranged in the one direction,
The auxiliary inclined surface, the first inclined surface, the second inclined surface, and the third inclined surface are repeatedly arranged in the one direction in this order,
In a cross section parallel to both the normal direction and the one direction of the light control sheet, the angle formed by the auxiliary inclined surface with respect to the normal direction is defined by the first inclined surface with respect to the normal direction. Smaller than the angle,
If it is assumed that the auxiliary inclined surface is not provided and an extended portion of the first inclined surface extends at the position of the auxiliary inclined surface in the one direction, the first inclined surface is located on the first surface of the light control sheet. The light that has entered from the incident direction and traveled to the extension portion is totally reflected by the extension portion, and then travels to a position other than the second inclined surface of the second surface. The panel member according to one item.   In a cross section parallel to both the normal direction and the one direction of the light control sheet, the angle formed by the auxiliary inclined surface with respect to the normal direction is the incident direction on the first surface of the light control sheet. The panel member according to claim 4, wherein a traveling direction of light entering from the first direction toward the first inclined surface is equal to or greater than an angle formed with respect to the normal direction. A light reflecting sheet disposed to face the second surface of the light control sheet;
A bonding layer provided between the light control sheet and the light reflection sheet and bonding the light control sheet and the light reflection sheet; and
The panel member according to claim 1, wherein the bonding layer has a lower refractive index than the light control sheet. The panel member according to any one of claims 1 to 6,
A visual effect processing member disposed to face the panel member,
The visual effect processing member is a decorative material having light permeability and subjected to visual effect processing. The panel member according to any one of claims 1 to 6,
An optical device comprising: a light source that projects light onto the panel member.

Images