JP2015163910A - panel member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a panel member in which an angle range where an optical function from each optical functional face is continuously achieved is adjustable with high flexibility.SOLUTION: A panel member 10 includes: a plurality of unit lenses 30 arranged in a first axis direction d1; a first optical functional face 11 located opposing to the plurality of unit lenses; a sheet type main body 40 disposed between the plurality of unit lenses and the first optical functional face and having a first major face where the plurality of unit lenses is disposed and a second major face where a plurality of notches 41 each opposing to the unit lens is formed; a plurality of low refractive index portions 60 located in the corresponding notches 41 respectively; and a plurality of second optical functional faces 12 disposed between the low refractive index portions and the main body and inclined with respect to the first optical functional face. On an interface between the low refractive index portion and the main body, the low refractive index portion deflects light from the unit lens toward the first optical functional face 11.

Description

  The present invention relates to a panel member capable of guiding light incident from a certain direction to a first optical functional surface and guiding light incident from another direction different from the certain direction to a second optical functional surface.

  As a typical example of such a panel member, a display medium whose surface to be observed changes between the first optical functional surface and the second optical functional surface according to the observation direction of the panel member is exemplified (for example, a patent) Reference 1). In this panel member, for example, the first and second optical functional surfaces form a pattern forming surface on which different patterns are formed. The observer can observe different patterns given to the first and second optical functional surfaces according to the observation direction in which the panel member is observed.

  As shown in FIG. 13, in this panel member 1010, a plurality of unit lenses 130 are provided, and a region facing each unit lens 130 is divided into a first optical functional surface 111 and a second optical functional surface 112. . In the example shown in FIG. 13, the boundary between the first optical functional surface 111 and the second optical functional surface 112 is disposed at a position that becomes the focal point fp of the unit lens 130 with respect to the light L151 from the optical axis direction od. Then, in the observation from the direction inclined to one side (upper side in FIG. 13) from the normal direction of the panel member 1010, the pattern displayed by the first optical functional surface 111 is observed (see the light L152 in FIG. 13). In the observation from the direction inclined from the normal direction to the other side of the panel member, the pattern displayed by the second optical functional surface 112 is observed.

JP 2000-131783 A

  Such a panel member is generally produced using a transparent resin. And the refractive index of the cheap resin material generally used is about 1.40-1.60. Therefore, the light traveling direction cannot be greatly bent due to refraction at the lens surface of the unit lens. For this reason, the light L153 traveling in a direction inclined about 30 ° to one side from the normal direction of the panel member is refracted by the lens surface of the unit lens 130 and then faces another unit lens adjacent to the unit lens. 2 is incident on the optical function surface 112. Further, the light L154 traveling in the direction inclined further to the one side proceeds in the direction inclined more greatly even inside the panel member, and at the first optical functional surface 111 facing another unit lens, or at a further distant position. It is incident on a certain optical function surface. That is, in the conventional panel member, it is not possible to ensure a large angle range in which the optical function from the first optical function surface or the optical function from the second optical function surface is continuously expressed.

  In such a panel member, for example, when the optical functional surface forms a pattern formation surface, the pattern cannot be observed with a wide viewing angle. Therefore, it is difficult to use this panel member for general purposes as a medium for displaying a pattern, information, and the like. In addition, this panel member is used in an application in which the incident direction of incident light to the panel member is greatly changed, for example, an application in which sunlight is received and a desired optical function is expressed like a light receiving panel for a solar cell. Since the incident direction of sunlight on the panel member varies greatly with time and season due to the rotation and revolution of the earth, the panel member of FIG. 13 cannot be used efficiently or effectively.

  The present invention has been made in consideration of the above points, and provides a panel member capable of adjusting an angular range in which optical functions from each optical functional surface are continuously expressed with a high degree of freedom. For the purpose.

The panel member according to the present invention includes a plurality of unit lenses arranged in at least one axial direction,
A first optical functional surface located facing the plurality of unit lenses;
A sheet-like main body that is disposed between the plurality of unit lenses and the first optical functional surface and supports the plurality of unit lenses;
A plurality of low-refractive-index portions that are positioned opposite to each unit lens on a surface opposite to the side that supports the unit lens of the main-body portion, and a plurality of low-refractive-index portions that are lower than the main-body portion. A low refractive index part;
A plurality of second optical functional surfaces provided between the low refractive index portion and the main body portion and inclined with respect to the first optical functional surface,
The unit lens guides light incident from a certain direction to the first optical functional surface, guides light incident from another direction different from the certain direction to the second optical functional surface, and And guiding light incident from another direction different from the other direction to the low refractive index portion,
The low refractive index portion deflects light from the unit lens at an interface with the main body portion so that an angle formed by a traveling direction of the light with respect to a normal line direction of the main body portion is small.

  In the panel member according to the present invention, the low refractive index portion may deflect light from the unit lens at the interface with the main body portion and guide the light to the first optical function surface.

  In the panel member according to the present invention, the low refractive index portion may be made of air.

  In the panel member according to the present invention, the low refractive index portion includes a light incident surface on which light refracted by the unit lens is incident, and an angle formed by the light incident surface and the second optical functional surface is an acute angle. It may be.

  In the panel member according to the present invention, the light incident surface and the second optical functional surface of the low refractive index portion are opposite to each other with respect to a surface orthogonal to the first axis direction and parallel to the normal direction of the main body portion. It may be inclined.

In the panel member according to the present invention, an end portion located on one side in the uniaxial direction of each second optical functional surface is located on one side in the uniaxial direction with respect to a tip of a unit lens corresponding to the second optical functional surface. And
In each of the second optical functional surfaces, an end portion located on one side in the uniaxial direction is closer to the unit lens in a normal direction of the main body portion than an end portion located on the other side in the uniaxial direction. Further, it may be inclined with respect to the first optical function surface.

  In the panel member according to the present invention, in the cross section along both the normal direction of the panel member and the one direction, an end portion on the other side in the one direction of the second optical function surface is the first optical function surface. It may be connected.

  In the panel member according to the present invention, an end portion of the low refractive portion on the unit lens side is closer to the first optical element than a base end portion of the unit lens corresponding to the low refractive portion in the normal direction of the main body portion. It may be located close to the functional surface.

  The panel member by this invention WHEREIN: A solar cell panel may be provided facing the said 1st optical function surface, and the said 1st optical function surface may comprise the light-incidence surface of the said solar cell panel.

  In the panel member according to the present invention, the second optical functional surface may be a display surface for performing display.

  In the panel member according to the present invention, a display target element may be provided to each second optical functional surface, and a display target may be formed by a combination of the display target elements.

  In the panel member according to the present invention, the plurality of unit lenses are spaced apart from each other in the one direction, and form a surface of the panel member together with the unit lens between two unit lenses adjacent in the one direction. A connection surface may be provided.

  In the panel member according to the present invention, each unit lens may extend linearly in a direction intersecting the uniaxial direction.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to adjust the angle range from which the optical function from each optical function surface will be expressed continuously with a high freedom degree.

FIG. 1 is a perspective view showing a panel member for explaining an embodiment according to the present invention. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. FIG. 3 is a diagram for explaining the optical function of the second optical functional surface of the panel member. 4 is an enlarged cross-sectional view of the low refractive index portion of the panel member shown in FIG. FIG. 5 is a diagram for explaining the optical function of the second optical function surface in the same cross section as FIG. FIG. 6 is a diagram for explaining the optical function of the first optical function surface in the same cross section as FIG. 2. FIG. 7 is a diagram for explaining a method for manufacturing a panel member. FIG. 8 is a diagram for explaining a method for manufacturing a panel member. FIG. 9 is a diagram for explaining a method for manufacturing a panel member. FIG. 10 is a cross-sectional view corresponding to FIG. 2 and is a view for explaining a modification of the panel member. FIG. 11 is a cross-sectional view corresponding to FIG. 2 and is a view for explaining another modified example of the panel member. FIG. 12 is a cross-sectional view corresponding to FIG. 4 and shows an example in which a reflection surface is further provided so as to overlap the second optical function surface. FIG. 13 is a longitudinal sectional view showing a conventional panel member.

  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 9 are diagrams for explaining an embodiment of the present invention. 1 and 2 are perspective views or longitudinal sectional views showing the panel member 10, and FIGS. 3 to 5 are diagrams for explaining optical functions expressed by the panel member 10, and FIGS. FIG. 9 is a diagram for explaining an example of a method for manufacturing a panel member. In addition, as used in this specification, the shape and geometric conditions and the degree thereof are specified, for example, terms such as “parallel”, “orthogonal”, “identical”, length and angle values, etc. are strictly Without being bound by meaning, it should be interpreted including the extent to which similar functions can be expected.

  The panel member 10 described here is a panel-like member including a first optical functional surface 11 and a second optical functional surface 12 that are expected to exhibit some optical function. The optical function surface is a flat surface or a curved surface having a function utilizing the action or property of light, or a surface combining these. Light means not only visible light but also infrared rays to ultraviolet rays. Examples of the action and properties of light include straight light propagation, refraction, reflection, absorption, light emission, interference, and polarization. Examples of the optical function include a display function, an illumination function, a light shielding function, and an optical connection function with a solar cell, an optical element, an optical member, or an optical device. As shown in FIGS. 1 and 2, the panel member 10 includes a plurality of unit lenses 30 arranged in the first axial direction d1. The unit lens 30 expresses a lens function with respect to light incident on the panel member 10 or light emitted from the panel member 10, and adjusts the traveling direction of the light. The unit lens 30 guides light incident from a direction within a certain angle range AR1 to the first optical function surface 11, and guides light incident from a direction within a certain angle range AR2 to the second optical function surface 12. That is, the unit lens 30 refracts the light from the first optical function surface 11 and emits the light in the direction within the first angle range AR1, and refracts the light from the second optical function surface 12 to refract the second angle range AR2. The light is emitted in the inner direction.

  That is, the first optical function surface 11 has some optical function for light incident on the panel member 10 from the first angle range AR1 or for light emitted from the panel member 10 toward the first angle range AR1. Demonstrate. The second optical function surface 12 has some optical function for light incident on the panel member 10 from the second angle range AR2 or for light emitted from the panel member 10 toward the second angle range AR2. Demonstrate.

  And in the panel member 10 demonstrated here, the angle range from which the optical function from each optical function surface 11 and 12 is expressed continuously, ie, 1st angle range AR1 and 2nd angle range AR2, is shown. A device has been devised to enable adjustment with a high degree of freedom. As a result, the optical functions of the optical function surfaces 11 and 12 are stably exhibited, and the panel member 10 functions effectively.

  In one embodiment described in detail below, as an example, the first optical functional surface 11 functions as the light incident surface 50 a of the solar cell panel 50. That is, the light incident on the panel member 10 from the first angle range AR1 is adjusted in the traveling direction by the unit lens 30 and is incident on the solar cell panel 50 via the first optical functional surface 11 as the light incident surface 50a. And used for power generation. Moreover, the 2nd optical function surface 12 has comprised the display surface for displaying the display target 13, as an example. Here, the light incident on the panel member 10 is reflected by the second optical functional surface 12 or a display element connected thereto, and the traveling direction is adjusted by the unit lens 30, and the panel is directed toward the second angle range AR2. The light is emitted from the member 10. Alternatively, when the second optical functional surface 12 or a display element connected thereto emits light, the traveling direction of the light emitted from the second optical functional surface 12 is adjusted by the unit lens 30, and the second angular range AR2 The light is emitted from the panel member 10 toward the front. And the light radiate | emitted from the panel member 10 toward 2nd angle range AR2 displays the display target 13. FIG. That is, the observer can observe the display object 13 from the second angle range AR2. Examples of the display target 13 include graphics (patterns) such as graphics, patterns, designs, colors, pictures, photographs, and characters, and information such as letters, marks, and numbers. The display target 13 may be stationary or moving. However, the present invention is not limited to the embodiment described in detail below, and the optical function by the first optical functional surface 11 and the optical function by the second optical functional surface 12 can be appropriately changed. .

  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”, “light control plate”, and the like.

  Further, in this specification, the “sheet surface (film surface, plate surface, panel surface)” is the plane of the target sheet-like member when the target sheet-like member is viewed as a whole and globally. A surface that matches the direction. In the embodiment described below, the panel surface of the panel member 10, the sheet surface of the light control sheet 20 described later, the sheet surface of the main body 40 described later of the light control sheet 20, the panel surface of the solar cell panel 50, the sun The light incident surface 50a of the battery panel 50 and the first optical function surface 11 are parallel to each other. Furthermore, in this specification, the “normal direction” used for a sheet-like (film-like, plate-like, panel-like) member refers to a normal direction to the sheet surface of the member.

  Hereinafter, the configuration and operational effects of the panel member 10 according to this embodiment will be described in detail. As well shown in FIGS. 1 and 2, the panel member 10 includes a light control sheet 20 and a solar cell panel 50 disposed on the back surface of the light control sheet 20. The light control sheet 20 forms the front surface 10 a of the panel member 10, and the solar cell panel 50 forms the back surface 10 b of the panel member 10. The surface 10 a forms an incident surface for external light such as sunlight that enters the panel member 10. Further, the surface 10 a forms an emission surface from which light from the second optical function surface 12 that visualizes the display target 13 is emitted from the panel member 10.

  The light control sheet 20 includes a sheet-like main body portion 40 and a lens portion 25 supported on the main body portion 40. The lens unit 25 includes a large number of unit lenses 30 arranged in the first axial direction d1. A large number of unit lenses 30 are arranged such that their optical axes od are parallel to each other. In particular, in the illustrated example, the unit lens 30 is arranged such that the optical axis od thereof is parallel to the normal direction nd of the main body 40. Further, the first axial direction d1 is along the panel surface of the panel member 10 and is orthogonal to the normal direction nd of the main body 40. In the illustrated example, the panel member 10 is disposed such that the first axial direction d1 is parallel to the vertical direction.

  As shown in FIG. 1, the lens unit 25 constitutes a so-called lenticular lens or cylindrical lens. That is, the unit lenses 30 extend linearly in a direction intersecting the first axis direction d1 that is the arrangement direction. In particular, in the illustrated example, the unit lens 30 extends linearly in a second axial direction d2 that is orthogonal to both the first axial direction d1 and the normal direction nd. The plurality of unit lenses 30 included in the lens unit 25 are configured identically to each other.

  Each unit lens 30 has a convex lens-like lens surface 31 and protrudes from the sheet-like main body 40 toward the normal direction nd of the main body 40. The lens surface 31 forms the surface 10 a of the panel member 10. In the cross section of FIG. 2 parallel to both the first axial direction d1 and the normal direction nd (hereinafter also referred to as “main cut surface”), the lens surface 31 is symmetric about the optical axis od. . As shown in FIG. 2, each unit lens 30 collects parallel light beams incident on the lens surface 31 in a condensing region. The unit lens 30 shown in FIG. 2 shows an example in which parallel light L21 incident along the optical axis od of the unit lens 30 is collected at the focal point fp. In this case, the focal point fp is the optical axis od of the unit lens 30. Located on the top.

  Incidentally, in the illustrated example, the unit lenses 30 are arranged in the first axial direction d1 with a gap therebetween. That is, a connection surface 38 is provided between the lens surfaces 31 of the two unit lenses 30 adjacent to each other in the first axial direction d1 to connect the base end portions 32b facing each other. In the illustrated example, the connection surface 38 extends along the seat surface of the main body 40. The surface 10 a of the panel member 10 is formed by the lens surface 31 and the connection surface 38 of the unit lens 30. For example, the light control sheet 20 including the unit lens 30 can be manufactured by resin molding using a mold. By providing the connecting surface 38 and providing a gap between the adjacent unit lenses 30, before the light from the angle range greatly inclined with respect to the normal direction nd enters the unit lens 30, the adjacent unit lens The problem of being interrupted by 30, so-called “vignetting” can be reduced.

  The main body 40 has a first main surface 40a and a second main surface 40b as a pair of main surfaces facing each other. The first main surface 40a forms a surface adjacent to the lens portion 25, and the second main surface 40b forms a surface adjacent to the solar cell panel 50 of the light control sheet 20. As shown in FIG. 2, a plurality of notches 41 formed so as to face the corresponding unit lenses 30 are provided on the second main surface 40 b of the main body 40. Each notch part 41 is dented toward the normal direction nd of the main-body part 40 rather than the other part of the 2nd main surface 40b of the main-body part 40. The plurality of notches 41 are arranged in the first axial direction d1 corresponding to the unit lens 30 as the arrangement direction of the unit lenses 30. In the present embodiment, each incision portion 41 is disposed so as to at least partially face the corresponding unit lens 30 along the normal direction nd. In other words, each cut portion 41 overlaps at least partially with the corresponding unit lens 30 when viewed from the normal direction nd of the main body portion 40. In the present embodiment, each notch 41 is similar to the unit lens 30 in the direction intersecting the first axis direction d1 that is the arrangement direction, more strictly, the second axis orthogonal to the first axis direction d1. It extends linearly in the direction d2.

  As shown in FIG. 2, each cut portion 41 has a first cut surface 42 and a second cut surface 43 that extend from the back surface 10 b side of the panel member 10 toward the front surface 10 a side. The widths of the first cut surface 42 and the second cut surface 43 become narrower as the surface 10a of the panel member 10 is approached along the normal direction nd of the main body 40. Then, the end portion on the surface 10a side of the first cut surface 42 that is closest to the end portion on the surface 10a side of the second cut surface 43 is connected to each other.

  In this Embodiment, the surface 10a side of the notch part 41 located on the connection area | region of the edge part by the side of the surface 10a of the 1st notch surface 42, and the edge part by the side of the surface 10a of the 2nd notch surface 43 Is spaced from the first main surface 40 a of the main body 40. In other words, the end of the cut portion 41 on the surface 10a side is the first optical functional surface than the base end portion 32b of the unit lens 30 corresponding to the cut portion 41 in the normal direction nd of the main body portion 40. 11 is located close to. According to such a form, since thickness can be ensured between the notch part 41 and the 1st main surface 40a of the main-body part 40, the mechanical strength with respect to a bending or an impact can be ensured.

  In the present embodiment, the low refractive index portion 60 is arranged so as to fill the inside of the cut portion 41, and the second portion of the cut portion 41 is located at a position between the main body portion 40 and the low refractive index portion 60. The second optical function surface 12 is disposed along the cut surface 43. On the other hand, the first optical functional surface 11 is disposed so as to sandwich each low refractive index portion 60 with the second main surface 40b of the main body portion.

  The first optical function surface 11 extends in a planar shape so as to face each of the plurality of unit lenses 30 arranged in the first axial direction d1. In the illustrated example, the first optical functional surface 11 extends parallel to the sheet surface of the main body 40, in other words, the panel surface of the panel member 10. Accordingly, in the illustrated example, the first optical functional surface 11 extends in parallel with the first axis direction d1 that is the arrangement direction of the unit lenses 30 and is also the second axis direction d2 that is the longitudinal direction of the unit lenses 30. It extends and extends in parallel.

  As described above, the second optical function surface 12 is disposed in the cut portion 41 formed in the main body portion 40. That is, the second optical functional surface 12 is located between the unit lens 30 and the first optical functional surface 11 in the normal direction nd of the main body 40. The second optical function surface 12 is arranged in the first axial direction d1 corresponding to the unit lens 30 as the arrangement direction of the unit lenses 30. Each second optical functional surface 12 is positioned to face one unit lens 30 to which the second optical functional surface 12 corresponds. As shown in FIG. 2, each second optical functional surface 12 is arranged so as to face at least partially the corresponding unit lens 30 along the normal direction nd. In other words, each second optical functional surface 12 overlaps at least partially with the corresponding unit lens 30 when viewed from the normal direction nd of the main body 40. In the present embodiment, like the unit lenses 30, the second optical functional surface 12 extends linearly in a direction that intersects the first axial direction d1 that is the arrangement direction. More precisely, like the unit lens 30, the second optical functional surface 12 extends linearly in a second axial direction d2 orthogonal to the first axial direction d1. In the illustrated example, a large number of second optical functional surfaces 12 provided corresponding to the unit lenses 30 are configured identically.

  Each second optical functional surface 12 is inclined with respect to the first optical functional surface 11 and is inclined with respect to a direction parallel to the optical axis od of the unit lens 30. That is, each second optical functional surface 12 is non-parallel to both the first optical functional surface 11 and the optical axis od of the unit lens 30. According to such a second optical function surface 12, as described later, the second angle range AR2 that is an angle range in which the optical function from the second optical function surface 12 is expressed can be set with a high degree of freedom. In addition, the first angle range AR1, which is an angle range in which the optical function from the first optical function surface 11 is expressed, can be adjusted with a high degree of freedom.

  As shown in FIG. 2, each second optical functional surface 12 has one end portion 12 a located on one side in the first axial direction d <b> 1 (in the illustrated example, the upper side in FIG. 2 and the upper side in the vertical direction). The unit in the normal direction nd of the main body portion 40 is higher than the other end portion 12b located on the other side in the first axial direction d1 (the lower side in FIG. 2 and the lower side in the vertical direction in the illustrated example). The light control sheet 20 is inclined with respect to the sheet surface so as to be close to the lens 30. Accordingly, the one end portion 12 a of the second optical functional surface 12 is closer to the unit lens 30 in the normal direction nd of the main body portion 40 than the other end portion 12 b of the second optical functional surface 12. As understood from FIG. 2, light from an angle range inclined to the other side (downward) with respect to the normal direction nd is easily incident on the second optical function surface 12. Therefore, the optical function from the second optical function surface 12 is effectively exerted toward an angle range inclined to the other side (downward) with respect to the normal direction nd.

  From the viewpoint of strengthening such a tendency, the second optical functional surface 12 is stepwise from one side (upper side) to the other side (lower side) in the first axial direction d1 in the main cut surface of the panel member. Alternatively, it is preferable to continuously move away from the unit lens 30 along the normal direction nd of the main body 40. In the illustrated example, the second optical functional surface 12 is formed as a flat surface. Then, in the main cutting surface of the panel member shown in FIG. 2, the second optical functional surface 12 has a constant degree of inclination continuously from one side to the other side in the first axial direction d1. The unit 40 is separated from the unit lens 30 along the normal direction nd of the portion 40. According to the second optical function surface 12 as described above, the optical function from the second optical function surface 12 is effectively exhibited toward an angle range inclined to the other side with respect to the normal direction nd. become.

  As shown in FIG. 2, each second optical function surface 12 has a unit lens 30 corresponding to the second optical function surface 12 at one end portion 12 a located on one side (upper side) in the first axial direction d <b> 1. It is located in one side in the 1st axial direction d1 rather than the front-end | tip part 32a. That is, each of the second optical function surfaces 12 has one end portion 12a located on one side (upper side) in the first axial direction d1 that is more than the optical axis od of the unit lens 30 corresponding to the second optical function surface 12. It is located on one side in the one axial direction d1. As described above, the lens surface 31 of the unit lens 30 is symmetric about the optical axis od, and is refracted by the unit lens 30 so as to be tilted to the other side with respect to the normal direction nd. The light traveling through 40 is likely to pass through a region located on one side in the first axial direction d1 relative to the optical axis od. Therefore, the one end portion 12a of each second optical function surface 12 is positioned at one side in the first axial direction d1 with respect to the optical axis od of the corresponding unit lens 30, and is refracted by the unit lens 30 to be normal. The light that travels in the main body 40 from the direction inclined to the other side with respect to the direction nd is more easily received by the second optical function surface 12. That is, the optical function from the second optical function surface 12 is more effectively exerted toward an angle range inclined to the other side (downward) with respect to the normal direction nd.

  In the illustrated embodiment, in the main cutting surface of the panel member shown in FIG. 2, the other end portion 12 b that is the end portion on the other side (lower side) of the second optical function surface 12 in the first axial direction d <b> 1. Is located at the same position in the first axial direction d1 as the tip 32a of the lens surface 31 of the unit lens 30 corresponding to the second optical function surface 12. Further, in the main cut surface of the panel member shown in FIG. 2, one end portion 12a that is one end portion of the second optical functional surface 12 in the first axial direction d1 corresponds to the second optical functional surface 12. The base end portion 32b on one side of the lens surface 31 of the unit lens 30 in the first axial direction d1 is located at the same position in the first axial direction d1. However, in the main cut surface of the panel member shown in FIG. 2, the one end portion 12 a of the second optical functional surface 12 is in the first axial direction of the lens surface 31 of the unit lens 30 corresponding to the second optical functional surface 12. It may be displaced from the base end portion 32b on one side in d1 in the first axial direction d1. In particular, in the illustrated example, in the main cutting surface of the panel member shown in FIG. 2, the one end portion 12 a of the second optical functional surface 12 is on one side of the lens surface 31 of the unit lens 30 in the first axial direction d1. It is separated from the base end portion 32b toward the back surface 10b side of the panel member 10 along the normal direction nd of the main body portion 40.

  The tip 32 a of the lens surface 31 of the unit lens 30 is the portion of the lens surface 31 that protrudes most from the main body 40 along the normal direction nd of the main body 40. Further, the base end portion 32 b of the lens surface 31 of the unit lens 30 is connected to the portion of the lens surface 31 that is closest to the main body portion 40 along the normal direction nd of the main body portion 40 or to the main body portion 40. It is a part to do.

  In addition, as shown in FIG. 2, the first optical functional surface 11 is located on the focal point fp of the unit lens 30. More precisely, the first optical functional surface 11 is located on a virtual surface defined by the focal points fp of a large number of unit lenses 30 included in the lens unit 25. In the main cutting surface of the panel member shown in FIG. 2, the other end portion 12b located on the other side (lower side) of the second optical function surface 12 in the first axial direction d1 is the first optical function surface 11. Connected to. That is, in the illustrated embodiment, the other end portion 12b of the second optical functional surface 12 has a parallel light beam L21 (see FIG. 2) traveling in the normal direction nd of the main body portion 40 in the main cutting surface of the panel member. It is located on the focal position fp of the unit lens 30 when entering the unit lens 30. In other words, the other end 12 b of the second optical function surface 12 is located on the optical axis od of the unit lens 30. According to such a panel member 10, it is possible to separate the first angle range AR1 and the second angle range AR2 with the normal direction nd of the main body 40 as a boundary.

  In the illustrated embodiment, the first optical functional surface 11 functions as the light incident surface 50 a of the solar cell panel 50 as described above. That is, the light incident on the panel member 10 from the first angle range AR1 enters the solar cell panel 50 through the first optical function surface 11 as the light incident surface 50a and is used for power generation. The solar cell panel 50 includes a solar cell element, and generates an electric current by the captured light. The solar cell panel 50 can use various known members, and is not particularly limited.

  On the other hand, the second optical functional surface 12 in the illustrated embodiment forms a display surface for displaying the display target 13. Therefore, the light emitted from the panel member 10 toward the second angle range AR2 makes the display target 13 visible. That is, the second optical function surface 12 is visually recognized from the second angle range AR2, and as a result, the display target 13 formed on the second optical function surface 12 can be observed. In addition, when displaying the display object 13 which moves by the 2nd optical function surface 12, it is easy to use the electricity generated from the solar cell panel 50 adjacent to the 1st optical function surface 11 for a drive.

  FIG. 3 shows an example of the display object 13 formed on the second optical function surface 12. A plurality of second optical functional surfaces 12 are arranged in the first axial direction d1, and each second optical functional surface 12 extends linearly in a second axial direction d2 orthogonal to the first axial direction d1. . Therefore, the second optical functional surface 12 located at each position in the first axial direction d1 is provided with the display target element 13a corresponding to the position of the second optical functional surface 12 in the first axial direction d1, The two-dimensional display target 13 can be displayed as a combination of display target elements 13a formed on the respective second optical function surfaces 12 that are elongated in the second axial direction d2. In the example shown in FIG. 3, the capital letter “N” of the alphabet is displayed as the display target 13. Thus, since the size of each second optical functional surface 12 and each unit lens 30 can be reduced by displaying the display target 13 as a combination of a plurality of display target elements 13a, the second angle range AR2 can be expanded or the panel can be expanded. Even if the size of the member 10 is increased, a better display object 13 can be observed.

  The panel member 10 of this Embodiment can adjust the angle range in which the display target 13 is continuously displayed with a high degree of freedom. Therefore, the panel member 10 of this Embodiment can be used for various uses, for example, the large-sized panel use of several m-several dozen m size used with an outdoor signboard, a road information bulletin board, the outer wall surface of a building, etc. Examples include medium-sized panel applications of several tens of centimeters to several meters in size used for posters, signs, and inner walls of buildings, and small panel applications of several centimeters to several tens of centimeters used in table lamps, portable terminals, etc. can do.

  As described above, the unit lens 30 guides the light L22 incident from the direction inclined to one side in the first axial direction d1 with respect to the normal direction nd of the main body 40 to the first optical function surface 11, and The light L23 incident from the direction inclined to the other side in the first axial direction d1 with respect to the normal direction nd of the main body 40 is guided to the second optical function surface 12. However, as shown in FIG. 2, the light L25 incident on the unit lens 30 from a direction greatly inclined to one side in the first axial direction d1 with respect to the normal direction nd of the main body 40 is the unit lens 30 and the other. The second optical functional surface 12 facing the unit lens 30 adjacent on the side is directed from the back surface 10b side of the panel member 10. If the light L25 from such a direction enters the second optical function surface 12 from the back surface 10b side, the optical function expected from the second optical function surface 12 is not expressed. Therefore, in the present embodiment, the cutting is performed where the second optical function surface 12 is arranged so as to guide the light L25 from the back surface 10b side of the panel member 10 toward the second optical function surface 12 to the first optical function surface 11. A low refractive index portion 60 is provided in the insertion portion 41. The low refractive index portion 60 has a refractive index lower than that of the main body portion 40. According to such a low refractive index portion 60, the light L25 incident on the unit lens 30 from the direction greatly inclined to one side in the first axial direction d1 with respect to the normal direction nd of the main body portion 40 is also the first optical. In order to be able to guide to the functional surface 11, the first angle range AR1 can be further widened.

  In FIG. 4, the low refractive index part 60 arrange | positioned in the notch part 41 is expanded and shown. As shown in FIG. 4, the low refractive index portion 60 of the present embodiment is provided in the cut portion 41 so as to fill the cut portion 41 in which the second optical functional surface 12 is disposed. . For this reason, the low refractive index portion 60 corresponds to the shape of the cut portion 41 formed in the main body portion 40. Therefore, the plurality of low refractive index portions 60 are arranged in the first axial direction d <b> 1, which is the arrangement direction of the unit lenses 30, similarly to the cut portions 41. In the present embodiment, each low refractive index portion 60 is arranged so as to at least partially face the corresponding unit lens 30 along the normal direction nd. In other words, each low refractive index portion 60 at least partially overlaps the corresponding unit lens 30 when viewed from the normal direction nd of the main body portion 40. Furthermore, the low refractive index portion 60 corresponds to the shape of the cut portion 41, and intersects the first axis direction d1 that is the arrangement direction of the unit lenses 30, more strictly, perpendicular to the first axis direction d1. Extends linearly in the second axial direction d2.

  As shown in FIG. 4, the low refractive index portion 60 is formed along the light incident surface 61 arranged along the first cut surface 42 of the cut portion 41 and the second cut surface 43 of the cut portion 41. And a light exit surface 63 extending between the end of the light incident surface 61 on the back surface 10b side and the end of the connection surface 62 on the back surface 10b side. Among these, the light incident surface 61 is a surface on which the light L31 refracted by the unit lens 30 is incident, and the light output surface 63 is a surface on which the light L31 from the light incident surface 61 is emitted. In the example shown in FIG. 4, the light exit surface 63 is located along the first optical function surface 11 and is adjacent to the first optical function surface 11. The light incident surface 61 extends from an end portion located on one side of the light exit surface 63 in the first axial direction d1 toward the unit lens 30 side, that is, the surface 10a side of the panel member 10. The connection surface 62 extends from the end portion of the light exit surface 63 located on the other side in the first axial direction d1 toward the unit lens 30 side, that is, the surface 10a side of the panel member 10. The connection surface 62 is located along the second optical function surface 12 and is adjacent to the second optical function surface 12.

  As shown in FIG. 4, the widths of the light incident surface 61 and the connection surface 62 correspond to the shapes of the first cut surface 42 and the second cut surface 43 of the cut portion 41. As the distance from the light exit surface 63 increases along the line direction nd, the width decreases. The end portion on the surface 10a side of the light incident surface 61 having the narrowest width and the end portion on the surface 10a side of the connection surface 62 are connected to each other. In particular, in the example shown in FIG. 4, the light incident surface 61, the connection surface 62, and the light exit surface 63 are formed as flat surfaces, and the low refractive index portion 60 has a triangular shape on the main cut surface.

  However, the cross-sectional shape of the low refractive index portion 60 on the main cut surface does not have to be a triangular shape, and may have various shapes. For example, the cross-sectional shape of the low refractive index portion 60 on the main cut surface may be a shape in which one or more corners of a triangle, for example, a corner where the light incident surface 61 and the connection surface 62 are connected are chamfered. Further, an upper surface extending between the end portion of the light incident surface 61 on the surface 10a side and the end portion of the connection surface 62 on the surface 10a side may be further provided. That is, the cross-sectional shape of the low refractive index portion 60 on the main cut surface may be a trapezoidal shape.

  Such a low refractive index portion 60 is not particularly limited as long as it has a lower refractive index than the material forming the main body portion 40, and may be a fluid or a solid. Examples of the material forming the main body 40 include acrylate resins such as urethane acrylate and epoxy acrylate whose refractive index is adjusted to about 1.50 to 1.60. On the other hand, examples of the resin material forming the low refractive index portion 60 include an ultraviolet curable resin such as acrylic, epoxy, and urethane whose refractive index is adjusted to about 1.45 to 1.51. When the low refractive index portion 60 is made of a resin material having a refractive index lower than that of the resin material forming the main body portion 40, the second optical functional surface 12 can be protected by covering the second optical functional surface 12 with a resin material. it can. Thereby, the tolerance with respect to disturbances, such as a change of an environment and a vibration, can be provided to the 2nd optical function surface 12 arrange | positioned in the notch part 41 formed in the main-body part 40. FIG. Alternatively, the low refractive index portion 60 may be made of gas. In this case, since a large refractive index difference can be generated at the interface between the light incident surface 61 of the low refractive index portion 60 and the main body portion 40, the light L25 coming from the unit lens 30 toward the low refractive index portion 60 can be generated. The traveling direction can be largely changed so that the angle formed with respect to the normal direction nd of the main body 40 is small. In the present embodiment, the low refractive index portion 60 is made of air.

  According to such a low refractive index portion 60, at the interface between the light incident surface 61 and the main body portion 40, from a direction greatly inclined to one side in the first axial direction d1 with respect to the normal direction nd of the main body portion 40. The light L25 incident on the unit lens 30 can be deflected so that the angle formed by the traveling direction of the light L25 with respect to the normal direction nd of the main body 40 is small. As described above, since the first optical function surface 11 is disposed along the sheet surface of the main body 40, according to the low refractive index portion 60, the light L 31 from the unit lens 30 is transmitted to the first optical function surface 11. Can be deflected towards From the viewpoint of effectively expressing such an optical function, it is preferable that the light incident surface 61 of the low refractive index portion 60 satisfies a geometrical relationship as described below.

  First, as shown in FIG. 4, the light L31 intended to be deflected by the low refractive index portion 60 approaches the second optical function surface 12 from the back surface 10b side of the panel member 10. Therefore, the angle θ3 formed by the light L31 that is intended to be deflected by the low refractive index portion 60 with respect to the normal direction nd of the main body portion 40 is formed by the second optical functional surface 12 with respect to the normal direction nd. It becomes larger than the angle θ1. As understood from the geometrical relationship shown in FIG. 4, in order to deflect the light L31 intended to be deflected by the low refractive index portion 60 toward the first optical functional surface 11, the light L31 is used. Must be incident on the normal direction ND1 of the light incident surface 61 from the side opposite to the first optical functional surface 11. Therefore, the low refractive index portion 60 deflects the light L31 incident at an angle larger than the angle θ1 formed by the second optical function surface 12 with respect to the normal direction nd toward the first optical function surface 11. In the main cut surface, the angle θ2 formed between the second optical function surface 12 and the light incident surface 61 of the low refractive index portion 60 is at least a plane P2 orthogonal to the second optical function surface 12 and the second optical function surface. What is necessary is just to become smaller than the angle which 12 makes. That is, the angle θ2 formed between the second optical function surface 12 and the light incident surface 61 of the low refractive index portion 60 may be at least an acute angle, that is, an angle of 0 ° or more and less than 90 °. Here, the plane P2 is a plane that extends from the end portion close to the front surface 10a of the low refractive index portion 60 toward the back surface 10b in the direction orthogonal to the second optical function surface 12. By making the angle θ2 formed between the second optical function surface 12 and the light incident surface 61 an acute angle, the second optical function surface 12 is directed at an angle larger than the angle θ1 formed with respect to the normal direction nd of the main body 40. At least a part of the incoming light L31 can be bent so that the angle formed by the traveling direction with respect to the normal direction nd of the main body 40 is small.

  Further, on the main cut surface, the base end portion 32b located on one side in the first axial direction d1 of the unit lens 30 on which the target light is incident, and the surface of the low refractive index portion 60 on which the target light is deflected A straight line connecting the end close to 10a is defined as SL2. In other words, in the main cut surface, of the base end portion of the unit lens 30 on which the target light is incident, the base end portion 32b located on the side away from the low refractive index portion 60 where the target light is deflected. A straight line connecting the connection position between the light incident surface 61 and the connection surface 62 of the low refractive index portion 60 where the target light is deflected is defined as SL2. As understood from the geometrical relationship shown in FIG. 4, the angle formed with respect to the normal direction nd of the main body 40 is the largest of the lights L31 and L32 intended to be deflected by the low refractive index portion 60. The light becomes light L32 directed from the direction parallel to the straight line SL2 toward the low refractive index portion 60. Therefore, in order to deflect the light L32 from the direction parallel to the straight line SL2 toward the low refractive index portion 60 toward the first optical function surface 11, the light L31 is incident on the light incident surface 61 as described above. It is necessary to enter from the side opposite to the first optical functional surface 11 with respect to the normal direction ND1. Therefore, in order to deflect the light L32 from the direction parallel to the straight line SL2 toward the low refractive index portion 60 toward the first optical function surface 11, the second optical function surface 12 enters the main cut surface. The angle θ2 formed with the optical surface 61 is preferably smaller than the angle θ4 formed between the plane P3 orthogonal to the straight line SL2 and the second optical function surface 12. That is, in the main cut surface, the light incident surface 61 is preferably disposed between the plane P3 orthogonal to the straight line SL2 and the second optical function surface 12. Here, the plane P3 is a plane extending toward the back surface 10b side from the end portion close to the front surface 10a of the low refractive index portion 60 in the direction orthogonal to the straight line SL2. By making the angle θ2 formed between the second optical functional surface 12 and the light incident surface 61 of the low refractive index portion 60 smaller than the angle θ4 formed between the plane P3 orthogonal to the straight line SL2 and the second optical functional surface 12 The arbitrary light L31 and L32 directed to the low refractive index portion 60 can be bent so that the angle formed by the traveling direction with respect to the normal direction nd of the main body portion 40 is small.

  Further, from the viewpoint of improving the mold manufacturing accuracy, the light incident surface 61 and the second optical functional surface 12 of the low refractive index portion 60 are orthogonal to the first axial direction d1 and in the normal direction nd of the main body portion 40. It is good to incline in the mutually opposite side with respect to a parallel surface. In this case, the convex part for forming the notch part 41 can be accurately formed in the mold for shaping the light control sheet 20. Thereby, the notch part 41 can be formed in the main-body part 40 with high precision, and as a result, the low refractive index part 60 arrange | positioned in the notch part 41 can be formed with high precision.

  Next, an example of a method for manufacturing the panel member 10 described above will be described mainly with reference to FIGS.

  First, as shown in FIG. 7, a molded product 70 is produced by molding a transparent resin. For the molding, hot-melt extrusion processing, injection molding, or the like can be employed. As shown in FIG. 7, in the obtained molded product 70, a cut portion 41 is formed in a portion that becomes the second main surface 40 b of the main body portion 40 of the light control sheet 20 described above. In addition, the lens portion 25 is formed on the molded product 70.

  Next, as shown in FIG. 8, a display surface as the second optical functional surface 12 is formed in the cut portion 41 of the molded product 70. As an example, the display target 13 is formed in the cut portion 41 of the molded product 70 by inkjet printing. Thereby, the light control sheet 20 on which the second optical functional surface 12 is formed is obtained.

  Next, as shown in FIG. 9, the solar cell panel 50 is joined to the side of the light control sheet 20 on which the cut portion 41 is formed. Thereby, the 1st optical function surface 11 which makes the light-incidence surface 50a of the solar cell panel 50 can be formed. Moreover, the low-refractive-index part 60 which consists of air can be provided in the notch part 41 by covering the notch part 41 of the light control sheet 20 with the solar cell panel 50. FIG. In addition, when the low refractive index part 60 is comprised with the resin material whose refractive index is lower than the material which makes the main-body part 40, a low refractive index is provided in the notch part 41 in which the 2nd optical function surface 12 was formed. What is necessary is just to fill the material which makes the part 60. FIG. Therefore, by providing the low refractive index portion 60 made of air in the cut portion 41, it is not necessary to fill the cut portion 41 with another material, and thus the panel member 10 can be manufactured efficiently. Thus, the panel member 10 described above is obtained.

  Next, the operation of the panel member 10 will be described mainly with reference to FIGS. The panel member 10 is arrange | positioned so that the 1st axial direction d1 which is the arrangement direction of the unit lens 30 follows a vertical direction, for example. Further, one end portion 12a located on one side in the first axial direction d1 of the second optical functional surface 12 is located on the upper side in the vertical direction, and is located on the other side in the first axial direction d1 of the second optical functional surface 12. The panel member 10 is arranged so that the other end portion 12b to be positioned is on the lower side in the vertical direction.

  A lens portion 25 is provided on the most observer side of the panel member 10. The unit lens 30 of the lens unit 25 exhibits a lens function with respect to light incident on the panel member 10 or light emitted from the panel member 10 to adjust the traveling direction of the light. The unit lens 30 guides light incident from a direction within a certain angular range AR1 to the first optical function surface 11 directly or using the low refractive index portion 60, and from the direction within a certain angular range AR2. The incident light is guided to the second optical function surface 12. In other words, the unit lens 30 refracts the light from the first optical function surface 11 and emits it in the direction within the first angle range AR1, and refracts the light from the second optical function surface 12 to the second angle range. The light is emitted in the direction within AR2. Accordingly, the first optical function surface 11 has some optical function for light incident on the panel member 10 from the first angle range AR1 or for light emitted from the panel member 10 toward the first angle range AR1. Can be demonstrated. The second optical function surface 12 has some optical function for light incident on the panel member 10 from the second angle range AR2 or for light emitted from the panel member 10 toward the second angle range AR2. Can be demonstrated.

  In the present embodiment, the first optical functional surface 11 forms the light incident surface 50 a of the solar cell panel 50. Therefore, it is preferable to guide light incident from a wide angle range to the first optical functional surface 11 and use it for power generation in the solar cell panel 50. In particular, sunlight changes its position according to the time zone and season. In the panel member 10, it is preferable that the sunlight that changes the incident direction according to the time zone and the season can be guided to the first optical function surface 11. That is, when taking in sunlight that changes the incident direction with high efficiency, it is preferable that the first angle range AR1 described above is widened.

Table 1 below shows the South-South Altitude (°) by season in major cities in some countries of the world. When the first optical functional surface 11 functions as the light incident surface 50a of the solar cell panel 50, the south and middle altitudes of equinox fall in major cities in the country where the use is assumed are included in the first angle range AR1. Is preferred. This is because there is a high possibility that it can be used effectively in that country. For example, when the country assumed to be used is Japan, the altitude from 54 ° to 56 ° may be included in the first angle range AR1. Furthermore, it is preferable that an altitude of 49 ° to 61 ° is included in the first angle range AR1, since there is a high possibility that it can be used effectively in many countries in the world. Further, it is more preferable that the first angle range AR1 includes a range from the southern middle altitude of the summer solstice to the southern middle altitude of the winter solstice in the main cities of the country where use is assumed. This is because there is a high possibility that it can be used effectively throughout the year in that country. For example, when the country assumed to be used is Japan, the altitude from 31 ° to 79 ° may be included in the first angle range AR1. Further, it is preferable that an altitude of 25 ° to 84 ° is included in the first angle range AR1, since it is highly possible that the altitude can be effectively used in many countries in the world. In order to make it easy for the desired altitude to be included in the first angle range AR1, it is preferable that the angle range of the first angle range AR1 is continuous by about 45 ° or more. However, it is possible to make the desired height fall within the first angle range AR1 by arranging the panel member 10 at an angle. On the other hand, the upper limit of the angle range of the first angle range AR1 may be set as appropriate in balance with the second angle range AR2, but by setting it to less than about 135 °, as described later, The feature of the panel member 10 can be exhibited more.

  On the other hand, in the present embodiment, the second optical function surface 12 is a display surface for displaying the display target 13. Therefore, it is possible to observe the display object 13 formed on the second optical function surface 12 from the second angle range AR2. In this application, the second angle range AR2 is a viewing angle at which the display target 13 can be observed. In general, it is preferable that the second angle range AR2 that is a viewing angle is widened. As in the prior art described with reference to FIG. 13, in a display medium in which a viewing angle of about 30 ° repeatedly appears with a gap, the visibility of a display target to be displayed is significantly reduced, and the information display function is effectively used. I can't demonstrate it. Therefore, it is preferable that the viewing angle of the second angle range AR2 is about 45 ° or more in order to further exhibit the features of the panel member 10 of the present embodiment. Note that the upper limit of the viewing angle of the second angle range AR2 may be set as appropriate in balance with the first angle range AR1, but it is considered that there are many cases where it is less than about 135 °.

  Further, if the solar cell panel 50 is observed together with the display target 13 while observing the display target 13, the visibility and design of the display target 13 are significantly impaired. Therefore, the second angle range AR2 in which the second optical functional surface 12 to which the display target 13 is applied can be observed is separated from the first angle range AR1 in which the solar cell panel 50 can be observed. Preferably they do not overlap.

  On the other hand, the panel member 10 according to the present embodiment described above includes the unit lenses 30 arranged in the first axial direction d1, the first optical functional surface 11 positioned facing the plurality of unit lenses, and the first And a second optical functional surface 12 that is arranged in the uniaxial direction d1 and that faces the unit lens 30. The second optical functional surface 12 is located between the unit lens 30 and the first optical functional surface 11 in the normal direction nd of the main body 40 and is inclined with respect to the first optical functional surface 11. ing. In particular, the second optical functional surface 12 is inclined and spreads with respect to the direction orthogonal to the optical axis od of the unit lens 30. On the other hand, the first optical functional surface 11 extends in a direction orthogonal to the optical axis od of the unit lens 30.

  In such a panel member 10, as well shown in FIG. 5, the inclined second optical functional surface 12 is a light L <b> 42 coming from the front direction, that is, the normal direction of the second optical functional surface 12. L43 and L44 can be received efficiently. In the example shown in FIG. 5, the second optical functional surface 12 is inclined to one side in the first axial direction d1 with respect to the optical axis od of the unit lens 30, and therefore the first axial direction with respect to the optical axis od. Light L42, L43, and L44 incident on the lens surface 31 from a direction inclined to the other side in d1 can be efficiently received. In the conventional example described with reference to FIG. 13, the light L153 and L154 from the direction inclined by about 30 ° or more with respect to the optical axis of the unit lens 130 is caused by the refractive index of the resin material that can be practically selected. The traveling direction is not greatly bent by the lens function of the unit lens 130, and as a result, the light is incident on the optical function surfaces 111 and 112 facing the unit lenses other than the unit lens 130. On the other hand, according to the present embodiment, as shown in FIG. 5, the light L44 incident on the lens surface 31 from the direction greatly inclined to the other side in the first axial direction d1 with respect to the optical axis od is also incident. The light is received by the second optical function surface 12 facing the unit lens 30. As indicated by a dotted line in FIG. 5, this light L44 is a unit different from the incident unit lens 30 if the second optical functional surface 12 is alternately arranged on the same surface as the first optical functional surface 11. Proceed to the area facing the lens, causing the problem described in the prior art.

  That is, the second optical function surface 12 is an angle range in the incident direction to the panel member 10 that is guided to the second optical function surface 12 by inclining the second optical function surface 12 with respect to the sheet surface of the light control sheet 20. The angle range AR2, in other words, the second angle range AR2 that is the angle range of the light emission direction from the second optical functional surface 12 is adjusted with a higher degree of freedom than the conventional example shown in FIG. be able to. In particular, the second optical functional surface 12 is inclined with respect to the first optical functional surface 11 in the cut portion 41 closer to the unit lens 30 than the first optical functional surface 11. Thereby, the second optical function surface 12 is inclined with respect to the optical axis od than the conventional panel member shown in FIG. 13 in which the second optical function surface 12 is alternately arranged on the same surface as the first optical function surface 11. Light L42, L43, L44 coming from the front direction of the surface 12 can be effectively received by the second optical function surface 12. As a result, the second optical functional surface 12 can receive light L42, L43, L44 coming from a wide range of directions inclined with respect to the optical axis od, as compared with the conventional example shown in FIG. The second angle range AR2 can be widened.

  Further, as shown in FIG. 6, the second optical function surface 12 is located between the unit lens 30 and the first optical function surface 11 in the normal direction nd of the main body 40. The first optical functional surface 11 is also disposed at a position opposite to the unit lens 30 of the inclined second optical functional surface 12. In the illustrated example, the first optical functional surface 11 extends and spreads over the entire region facing each unit lens 30 along the normal direction nd of the main body 40. As described above, the first optical functional surface 11 spreading over a wide range can receive light incident on the panel member 10 from a wide angle range.

  Further, the light L52, L53, and L54 traveling through the main body 40 from the direction in which the angle formed with respect to the second optical function surface 12 is smaller are less likely to be received by the second optical function surface 12. From this, the first optical functional surface 11 located on the back surface 10b side with respect to the inclined second optical functional surface 12 is efficiently received by the second optical functional surface 12 as shown in FIG. , L43, L44 (see FIG. 5), it is possible to efficiently receive the light L52, L53, L54 inclined to the opposite side. That is, light that enters the unit lens 30 while proceeding to the other side in the first axial direction d1, and in the illustrated example, efficiently receives light L52, L53, and L54 that enters the unit lens 30 while proceeding downward in the vertical direction. It becomes possible to do.

  However, even the light L54 that enters the unit lens 30 while traveling to the other side in the first axial direction d1 is refracted by the unit lens 30 if the angle formed with respect to the normal direction nd of the main body 40 is large. Thus, the unit lens 30 faces the second optical functional surface 12 facing the unit lens 30 adjacent to the unit lens 30 from the back surface 10b side of the panel member 10. As described above, in the present embodiment, in order to enable such light L54 to be guided to the first optical function surface 11, the low level is reduced in the cut portion 41 in which the second optical function surface 12 is disposed. A refractive index portion 60 is provided. For this reason, as shown in FIG. 6, the light L <b> 54 traveling toward the second optical function surface 12 from the back surface 10 b side is the light L <b> 54 at the interface between the light incident surface 61 of the low refractive index portion 60 and the main body portion 40. Is bent so that the angle formed by the traveling direction with respect to the normal direction nd of the main body 40 becomes small. Thereby, even the light L54 incident on the unit lens 30 from a direction greatly inclined to one side in the first axial direction d1 with respect to the normal direction nd of the main body 40 is guided to the first optical function surface 11. Can do. As can be understood from FIG. 6, this light L54 is a unit different from the incident unit lens 30 if the second optical functional surface 12 is alternately arranged on the same surface as the first optical functional surface 11. Proceed to the area facing the lens, causing the problem described in the prior art.

  That is, the second optical functional surface 12 is inclined in the region between the unit lens 30 and the first optical functional surface 11, and the low refractive index portion 60 is provided in the cut portion 41 in which the second optical functional surface 12 is disposed. By providing the first angle range AR1, which is the angle range in the direction of incidence on the panel member 10 to be guided to the first optical function surface 11, in other words, in the direction of light emission from the first optical function surface 11. The first angle range AR1, which is the angle range, can be adjusted with a high degree of freedom compared to the conventional example shown in FIG. 13, and can also be remarkably widened.

  As described above, according to the present embodiment, the plurality of unit lenses 30 arranged in the first axial direction d1, the first optical functional surface 11 positioned facing the plurality of unit lenses 30, and the plurality of units. A sheet-like main body 40 that is disposed between the lens 30 and the first optical functional surface 11 and supports the plurality of unit lenses 30, and a second side that is opposite to the side of the main body 40 that supports the unit lenses 30. 2 between the plurality of low refractive index portions 60 and the low refractive index portions 60 and the main body portion 40 respectively positioned in the plurality of cut portions 41 formed so as to face the unit lenses 30 on the main surface 40b. A plurality of second optical functional surfaces 12 that are inclined with respect to the first optical functional surface 11, and the low refractive index portion 60 is light L25, L54 from the unit lens 30 at the interface with the main body portion 40. The traveling direction of the lights L25 and L54 is As deflect the angle formed with respect to a line direction nd decreases. According to such a panel member 10, the optical function at the first angle range AR <b> 1 and the second optical function surface 12 that are the angle ranges in the direction in which the optical function at the first optical function surface 11 is exhibited is exhibited. It is possible to adjust the second angle range AR2 that is the angle range of the direction with a high degree of freedom. It is also possible to effectively widen the first angle range AR1 and the second angle range AR2. Furthermore, the adjustment or widening of the first angle range AR1 and the second angle range AR2 does not require the use of a high-refractive index material, which is generally expensive, for the unit lens 30, and the same material as the conventional one can be used. That's fine. That is, the first angle range AR1 and the second angle range AR2 can be adjusted or widened without increasing the cost from the material surface.

  In particular, according to the present embodiment, the first optical functional surface 11 forms the light incident surface 50 a of the solar cell panel 50. As described above, according to the present embodiment, the optical function from the first optical function surface 11 is exhibited within the wide first angle range AR1, and therefore the incident direction according to the time zone and season. It is possible to efficiently receive the sunlight that changes the power and use it for power generation in the solar cell panel 50.

  In particular, according to the present embodiment, the second optical function surface 12 is a display surface for displaying the display object 13. As described above, according to the present embodiment, since the optical function from the second optical function surface 12 is exhibited within the wide second angle range AR2, the second function can be achieved stably from a wide viewing angle. The display object 13 given to the optical function surface 12 can be observed. Therefore, the observer can observe the display object 13 with excellent visibility, and can display the display object 13 with excellent design.

  Further, in the present embodiment, as shown in FIG. 2, the one end portion 12 a located on one side in the first axial direction d <b> 1 of each second optical function surface 12 is a unit corresponding to the second optical function surface 12. One end portion 12a located on one side in the first axial direction d1 is located on one side in the first axial direction d1 from the tip end portion 32a of the lens 30, and the first axial direction d1 is located on one side in the first axial direction d1. In the normal direction nd of the main body portion 40, the other end portion 12 b located on the other side is inclined with respect to the first optical functional surface 11 so as to be closer to the unit lens 30. According to such a form, the second optical functional surface 12 can efficiently receive the light L23, L42, L43, L44 coming from the front direction of the second optical functional surface 12, Light from a direction inclined to the other side in the first axial direction d1 with respect to the normal direction nd of the main body 40, in other words, light L23 and L42 entering the panel member 10 while proceeding to one side in the first axial direction d1. , L43 and L44 are likely to enter the second optical function surface 12. In other words, the light L23, L42, L43, and L44 from the second optical function surface 12 is easily emitted in a direction inclined to the other side in the first axial direction d1 with respect to the normal direction nd of the main body 40. On the other hand, the light L22, L52, L53, and L54 from the direction inclined to one side in the first axial direction d1 with respect to the normal direction nd of the main body 40 is from the direction in which the angle formed with the second optical function surface 12 is small. Since the light travels in the main body 40, it is difficult for the second optical functional surface 12 to receive light. Light from the direction inclined to one side in the first axial direction d1 with respect to the normal direction nd of the main body portion 40, which is difficult to be received by the second optical functional surface 12, in other words, the other side in the first axial direction d1 The light L22, L52, L53, and L54 incident on the panel member 10 while proceeding to is easily incident on the first optical function surface 11. In other words, the lights L22, L52, L53, and L54 from the first optical function surface 11 are easily emitted in a direction inclined to one side in the first axial direction d1 with respect to the normal direction nd of the main body 40.

  That is, according to the above embodiment, the first angular range AR1 that is the angular range in which the optical function from the first optical functional surface 11 is exhibited, and the optical function from the second optical functional surface 12 are exhibited. The second angle range AR2, which is the angle range in the direction in which the image is to be generated, is easily distinguished. In other words, the first angle range AR1 and the second angle range AR2 are difficult to overlap. Thereby, the first angle range AR1 and the second angle range AR2 can each be effectively widened.

  Thus, if the overlap between the first angle range AR1 and the second angle range AR2 is reduced, and if it is possible to further separate the first angle range AR1 and the second angle range AR2, the first optical functional surface is obtained. The optical function at 11 and the optical function at the second optical function surface 12 are more effectively exhibited without adversely affecting each other. In the present embodiment, when observing the display object 13 given to the second optical function surface 12, the solar cell panel 50 superimposed on the first optical function surface 11 is observed together with the display object 13. This can be effectively prevented. In this case, the visibility of the display target 13 and the design of the display target 13 can be improved.

  In particular, in the panel member 10 according to the present embodiment, the first angle range AR1 that is the angle range of the incident direction to the panel member 10 to be guided to the first optical functional surface 11 is inclined upward in the vertical direction. And the second angle range AR2, which is the angle range in the direction of incidence on the panel member 10 to be guided to the second optical function surface 12, is set in a direction inclined downward in the vertical direction. In this case, when the panel member 10 is installed at a position higher than the line of sight in an application as a display plate assumed as a typical use, the observer observes the panel member 10 while looking up at the upper side in the vertical direction. The display object 13 given to the second optical function surface 12 can be observed from the second angle range AR2. On the other hand, the incident direction of sunlight changes depending on the time zone and season, but enters the lens surface 31 while proceeding in a direction inclined downward in the vertical direction. For this reason, sunlight can enter the lens surface 31 from the first angle range AR1 and travel toward the first optical functional surface 11 even if the incident direction changes according to the time zone or season. Therefore, according to such a form, the reception of sunlight and the display of the display target 13 can be effectively made compatible.

  In addition, according to the present embodiment, the other end portion 12b on the other side in the first axial direction d1 of the second optical function surface 12 is connected to the first optical function surface 11 in the main cut surface. . According to such a configuration, the light incident on the panel member 10 from the second angle range AR2 passes between the other end portion 12b of the second optical function surface 12 and the first optical function surface 11 to be the first. Reaching the optical function surface 11 can be prevented. For this reason, it contributes to distinguishing 1st angle range AR1 and 2nd angle range AR2 more clearly.

  Moreover, according to this Embodiment, the low-refractive-index part 60 consists of air. In this case, since a large refractive index difference can be generated at the interface between the light incident surface 61 of the low refractive index portion 60 and the main body portion 40, the light L25 coming from the unit lens 30 toward the low refractive index portion 60, L54 can be largely bent so that the angle formed by the traveling directions of the lights L25 and L54 with respect to the normal direction nd of the main body 40 is small. Thereby, even if it is the light L25 and L54 which injected into the unit lens 30 from the direction which inclined very much to the one side in the 1st axial direction d1 with respect to the normal line direction nd of the main-body part 40, the 1st optical function surface 11 is carried out. Can be effectively led to. As a result, the first angle range AR1 that is the angle range of the incident direction to the panel member 10 to be guided to the first optical function surface 11, in other words, the angle of the light emission direction from the first optical function surface 11 The first angle range AR1, which is the range, can be adjusted with a higher degree of freedom compared to the conventional example shown in FIG. 13, and can be further widened.

  Further, according to the present embodiment, the low refractive index portion 60 includes the light incident surface 61 on which the light refracted by the unit lens 30 enters, and is formed by the light incident surface 61 and the second optical functional surface 12. The angle θ2 is an acute angle. According to such a configuration, at least a part of the light L31 traveling toward the low refractive index portion 60 at an angle θ3 larger than the angle θ1 formed by the second optical function surface 12 with respect to the normal direction nd travels. The direction can be bent so that an angle formed with respect to the normal direction nd of the main body 40 is small. That is, at least a part L31 of light refracted by the unit lens 30 and coming from the back surface 10b side of the panel member 10 toward the second optical function surface 12 can be effectively guided to the first optical function surface 11.

  Further, according to the present embodiment, the light incident surface 61 and the second optical function surface 12 of the low refractive index portion 60 are surfaces that are orthogonal to the first axial direction d1 and parallel to the normal direction nd of the main body portion 40. With respect to each other. In this case, the convex part for forming the notch part 41 can be accurately formed in the mold for shaping the light control sheet 20. Thereby, the notch part 41 is formed in the main-body part 40 with high precision, and as a result, the low refractive index part 60 arrange | positioned in the notch part 41 can be formed with high precision.

  Further, according to the present embodiment, the end portion of the low refractive index portion 60 on the unit lens 30 side is the base end portion of the unit lens 30 corresponding to the cut portion 41 in the normal direction nd of the main body portion 40. It is located closer to the first optical function surface 11 than 32b. According to such a form, since thickness can be ensured between the notch part 41 and the 1st main surface 40a of the main-body part 40, the mechanical strength with respect to a bending or an impact can be ensured.

  Furthermore, according to the present embodiment, the plurality of unit lenses 30 are arranged apart from each other in the first axial direction d1, and between the two unit lenses 30 adjacent to each other in the first axial direction d1, the unit lens 30. In addition, a connection surface 38 forming the surface 10a of the panel member 10 is provided. By providing the connection surface 38, it is possible to reduce the “scratch” of the adjacent lens with respect to light traveling in a direction greatly inclined with respect to the normal direction nd.

  In particular, in the present embodiment, the connection surface 38 extends along the panel surface of the panel member 10. Further, the second optical function surface 12 is arranged along the panel surface of the panel member 10 so as to be shifted from the connection surface 38. In this embodiment, as shown in FIG. 6, the light L <b> 56 that enters the panel member 10 through the connection surface 38 enters the first optical function surface 11. Therefore, the first optical functional surface 11 also exhibits some optical function in the direction of the light L56, for example, the light can be taken into the solar cell panel 50.

≪Modification≫
Note that various modifications can be made to the above-described embodiment. Hereinafter, an example of modification will be described with reference to the drawings. In the following description and the drawings used in the following description, the same reference numerals as those used for the corresponding parts in the above-described embodiment are used for parts that can be configured in the same manner as in the above-described embodiment, and overlapping Description to be omitted is omitted.

  In the above-described embodiment, as shown in FIG. 2, the other end portion 12 b located on the other side (lower side in the drawing) of the second optical function surface 12 in the first axial direction d1 on the main cutting surface of the panel member. However, the parallel light beam L21 (see FIG. 2) traveling in the normal direction nd of the main body 40 is positioned on the focal position fp of the unit lens 30 when it enters the unit lens 30. In such a panel member 10, the first angle range AR1 and the second angle range AR2 can be separated using the normal direction nd of the main body 40 as a boundary. However, the arrangement of the other end portion 12b of the second optical function surface 12 is not limited to such an example. 10 and 11 show an arrangement example of the other end portion 12b of the second optical function surface 12. FIG. In the example shown in FIGS. 10 and 11, the other end portion 12 b of the second optical functional surface 12 is the focal point of the unit lens 30 when the parallel light beam L <b> 27 traveling in the normal direction nd of the main body portion 40 is incident on the unit lens 30. The position is shifted from the position fp.

  Among these, in the example shown in FIG. 10, the other end portion 12 b of the second optical functional surface 12 is located on the other side in the first axial direction d <b> 1 with respect to the focal point fp of the corresponding unit lens 30. Further, the other end portion 12 b of the second optical function surface 12 is connected to the first optical function surface 11 on the virtual surface p <b> 1 defined by the focal points fp of the many unit lenses 30. According to such a configuration, the first angle range AR1 and the second angle range AR2 are centered on the direction da inclined to one side (upper side) in the first axial direction d1 with respect to the normal direction nd of the main body 40. Can be carved. In this case, for example, it is suitable when the panel member 10 is installed at a position that is not so high with respect to the line of sight in a use as a display plate assumed as a typical use. That is, when the observer observes the panel member 10 from the direction db with a small angle with respect to the horizontal direction or toward the direction dc inclined upward in the vertical direction, it is formed on the second optical functional surface 12. The displayed display object 13 can be observed. On the other hand, the sunlight L26 that travels in the direction de inclined downward in the vertical direction and enters the lens surface 31 can travel toward the first optical function surface 11. Therefore, according to such a form, while sufficiently capturing sunlight at the first optical function surface 11, the display object 13 given to the second optical function surface 12 is the same as or above the line of sight. It can be observed with excellent visibility.

  On the other hand, in the example shown in FIG. 11, the other end portion 12 b of the second optical functional surface 12 is located on one side in the first axial direction d <b> 1 with respect to the focal point fp of the corresponding unit lens 30. Further, the other end portion 12 b of the second optical function surface 12 is connected to the first optical function surface 11 on the virtual surface p <b> 1 defined by the focal points fp of the many unit lenses 30. According to such a configuration, the first angle range AR1 and the second angle range AR2 are centered on the direction dg inclined to the other side (downward) in the first axial direction d1 relative to the normal direction nd of the main body 40. Can be separated. In this case, for example, it is suitable when the panel member 10 is installed at a position relatively higher than the line of sight in a use as a display plate assumed as a typical use. That is, since the observer observes the panel member 10 while looking up at the upper side in the vertical direction, the display object 13 given to the second optical function surface 12 is looked up in the direction df inclined upward in the vertical direction. Can be observed. On the other hand, the sunlight L27 and L28 that enter the panel member 10 from the direction dh having a small angle with respect to the horizontal direction or entering the direction di inclined downward in the vertical direction are incident on the first optical function surface 11. Can proceed towards. Therefore, according to such a form, it is possible to look up at the display target 13 given to the second optical functional surface 12 with sufficient visibility, and to greatly emit sunlight on the first optical functional surface 11. It can be captured with high efficiency.

  In the example shown in FIGS. 2, 10, and 11, the other end portion 12 b of the second optical functional surface 12 is defined by the focal points fp of a large number of unit lenses 30 on the main cutting surface of the panel member. Although the example located on the surface was shown, it is not limited to such an example. The other end portion 12 b of the second optical functional surface 12 may be arranged so as to be shifted from the virtual surface defined by the focal points fp of the many unit lenses 30. In particular, the other end portion 12b of the second optical functional surface 12 is disposed on a virtual surface defined by the focal points fp of a large number of unit lenses 30 or at a position closer to the unit lens 30 than the virtual surfaces. In the case of being present, it is possible to prevent a possibility that the display near the one end portion 12a and the display near the other end portion 12b appear to be reversed depending on the observation angle.

  In the above-described embodiment, the reflecting surface 15 may be further arranged so as to overlap the second optical function surface 12. FIG. 12 shows such an example. In the panel member 10 shown in FIG. 12, the second optical function surface 12 faces the unit lens 30 side, and the reflection surface 15 faces the first optical function surface 11 side. That is, each reflecting surface 15 is disposed so as to be back-to-back with the corresponding second optical function surface 12. Such a reflective surface 15 is formed by a thin film made of a material having a high reflectance as an example. According to such a reflecting surface 15, light incident on the light incident surface 61 of the low refractive index portion 60 from a direction that is extremely inclined to one side in the first axial direction d1 with respect to the normal direction nd of the main body portion 40. Even if L33 is not sufficiently deflected toward the first optical function surface 11 by the light incident surface 61, it can be reflected by the reflection surface 15 and directed toward the first optical function surface 11. Therefore, by providing the reflecting surface 15, the first angle range AR1 corresponding to the incident angle range of the light guided to the first optical function surface 11 can be further widened. Thereby, the sunlight which changes an incident direction according to a time slot | zone and a season can be efficiently received by the 1st optical function surface 11, and it becomes possible to perform the electric power generation in the solar cell panel 50 efficiently.

  Furthermore, as already described, the first optical functional surface 11 functions as the light incident surface 50a of the solar cell panel 50, or the second optical functional surface 12 functions as a surface for displaying the display target 13. That is just an example. As an example, the first optical function surface 11 may also function as a display surface for performing display. In this modification, the panel member 10 is arranged so that the first direction d1 intersects the horizontal direction, and the display target displayed by the first optical functional surface 11 and the display displayed by the second optical functional surface 12 are displayed. The object may be switched and observed by changing the observation direction in the horizontal plane. At this time, the display object 13 that is moved by the first optical function surface 11 is displayed by superimposing the display on the first optical function surface 11, and the stationary display object 13 is displayed by the second optical function surface 12. Also good. As another example, the first optical functional surface 11 may function as a surface for displaying the display target 13, and the second optical functional surface 12 may function as the light incident surface 50 a of the solar cell panel 50. . Thereby, the inclined second optical function surface 12 is likely to receive sunlight incident from above.

  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.

DESCRIPTION OF SYMBOLS 10 Panel member 10a Front surface 10b Back surface 11 1st optical functional surface 12 2nd optical functional surface 12a One end part 12b Other end part 13 Display object 20 Light control sheet 25 Lens part 30 Unit lens 31 Lens surface 32a Front end part 32b Base end part 38 Connection surface 40 Main body portion 40a Front side surface 40b Back side surface 41 Cut portion 42 First cut surface 43 Second cut surface 50 Solar cell panel 50a Light incident surface 60 Low refractive index portion 61 Light incident surface 62 Connection surface 63 Light exit surface

Claims (11)

A plurality of unit lenses arranged in at least one axial direction;
A first optical functional surface located facing the plurality of unit lenses;
A sheet-like main body portion, which is located between the plurality of unit lenses and the first optical functional surface, and in which the plurality of unit lenses are disposed;
A plurality of low-refractive-index portions that are positioned opposite to each unit lens on a surface opposite to the side that supports the unit lens of the main-body portion, and a plurality of low-refractive-index portions that are lower in refractive index than the main-body portion A low refractive index part;
A plurality of second optical functional surfaces provided between the low refractive index portion and the main body portion and inclined with respect to the first optical functional surface,
The unit lens guides light incident from a certain direction to the first optical functional surface, guides light incident from another direction different from the certain direction to the second optical functional surface, and And guiding light incident from another direction different from the other direction to the low refractive index portion,
The low refractive index portion deflects light from the unit lens at an interface with the main body portion so that an angle formed by a traveling direction of the light with respect to a normal direction of the main body portion is small. Element.   The panel member according to claim 1, wherein the low refractive index portion deflects light from the unit lens at an interface with the main body portion and guides the light to the first optical function surface.   The low refractive index portion includes a light incident surface on which light refracted by the unit lens is incident, and an angle formed by the light incident surface and the second optical function surface is an acute angle. The panel member according to 2.   The light incident surface and the second optical function surface of the low refractive index portion are inclined opposite to each other with respect to a surface orthogonal to the first axis direction and parallel to the normal direction of the main body portion. Item 4. The panel member according to Item 3. An end portion located on one side in the uniaxial direction of each second optical function surface is located on one side in the uniaxial direction from a tip of a unit lens corresponding to the second optical function surface,
In each of the second optical functional surfaces, an end portion located on one side in the uniaxial direction is closer to the unit lens in a normal direction of the main body portion than an end portion located on the other side in the uniaxial direction. The panel member according to claim 1, wherein the panel member is inclined with respect to the first optical function surface.   In a cross section along both the normal line direction and the uniaxial direction of the main body, an end on the other side in the uniaxial direction of the second optical functional surface is connected to the first optical functional surface. Item 6. The panel member according to any one of Items 1 to 5.   An end of the low refractive portion on the unit lens side is positioned closer to the first optical function surface than a base end of the unit lens to which the low refractive portion corresponds in the normal direction of the main body. The panel member according to any one of claims 1 to 6. A solar cell panel is provided facing the first optical function surface,
The panel member according to claim 1, wherein the first optical functional surface is a light incident surface of the solar cell panel.   The panel member according to any one of claims 1 to 8, wherein the second optical function surface is a display surface for performing display.   The panel member according to claim 9, wherein a display target element is given to each second optical function surface, and a display target is formed by a combination of the display target elements. The plurality of unit lenses are arranged apart from each other in the uniaxial direction,
The panel member as described in any one of Claims 1-10 with which the connection surface which makes the surface of a panel member with the said unit lens between the two unit lenses adjacent to the said uniaxial direction is provided.

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