JP2013226671A - Panel member and optical device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a panel member in which a picture to be observed can be changed according to an incident state of light to the panel member.SOLUTION: A panel member 20 includes: a body part 50 having a first surface 51 and a second surface 52 opposing to the first surface; an optical sheet 40 having a plurality of connection elements 60 provided on the second surface of the body part; and an optical waveguide 30 that is arranged at a side at which the connection elements 60 of the optical sheet are provided. A pattern 80 for showing a picture 80a is formed on at least one of the first surface of the body part of the optical sheet 40 and an area 52b in which the connection elements on the second surface of the body part of the optical sheet are not provided.

Description

  The present invention relates to a panel member on which a pattern for displaying a pattern is formed, and more particularly to a panel member that can change a pattern that is observed according to the incident state of light on the panel member. The present invention also relates to an optical device including the panel member and a light source.

  For example, information display devices that display predetermined information by illuminating a sign or a sign board with light from a light source, such as a guide light or an advertising display, have been widely used in various fields. On the other hand, as disclosed in Patent Document 1, research has been conducted on an illumination device that projects light by changing the traveling direction of light from a light source.

Special table hei 10-513001

  On the other hand, as a result of intensive studies, the present inventors have invented a panel member that can cause a change in the pattern observed according to the incident state of light on the panel member. The inventors of the present invention can use this panel member to display a design that is highly unexpected and rich in design, and further, various optical devices including the panel member and a light source can be used. It has been found that the present invention can be applied to fields, for example, building materials such as wall materials, ceiling materials, floor materials, and lighting devices.

  That is, an object of the present invention is to provide a panel member that can change the pattern observed according to the incident state of light on the panel member, and an optical device including the panel member.

The panel member according to the present invention comprises:
An optical sheet having a first surface and a main body portion having a second surface facing the first surface; and a plurality of connecting elements provided on the second surface of the main body portion;
A light guide plate disposed on a side of the optical sheet on which the connection element is provided,
For displaying a pattern on at least one of the first surface of the main body portion of the optical sheet and the area of the second surface of the main body portion of the optical sheet where no connection element is provided. A pattern is formed.

  The panel member by this invention WHEREIN: A 1st pattern may be formed on the said 1st surface, and the 2nd pattern may be formed on the area | region in which the connection element of the said 2nd surface is not provided.

  The panel member by this invention WHEREIN: The said 1st pattern may be formed in the area | region on the said 1st surface at least facing the area | region in which the connection element of the said 2nd surface is provided.

  In the panel member according to the present invention, the pattern is formed in a region of the second surface where no connection element is provided, and faces the region of the second surface where the connection element is not provided. It may not be formed in the region on the first surface.

  The panel member by this invention WHEREIN: A 1st pattern is formed in the area | region on the said 1st surface facing the area | region in which the connection element of the said 2nd surface is provided, The connection of the said 2nd surface A second pattern is formed in a region on the first surface facing a region where no element is provided, and a picture displayed by a combination of the first pattern and the second pattern is the first pattern. You may make it differ from the picture displayed by this pattern.

  The panel member by this invention WHEREIN: The said pattern may be formed only in the area | region in which the connection element of the said 2nd surface is not provided.

  The panel member by this invention WHEREIN: The said pattern may be formed only in the area | region on the said 1st surface facing the area | region where the connection element of the said 2nd surface is not provided.

  In the panel member according to the present invention, the main body portion of the optical sheet may have a diffusion function of diffusing light.

  In the panel member according to the present invention, the main body may include a diffusion component.

  The panel member by this invention WHEREIN: The unevenness | corrugation for diffusing light may be formed in the area | region on the said 1st surface facing the area | region in which the connection element of the said 2nd surface is provided.

An optical device according to the present invention comprises:
Any of the panel members according to the invention described above;
And a light source disposed to face the side surface of the light guide plate of the panel member.

  In the optical device according to the present invention, the light source is disposed to face a portion located on one side in one direction orthogonal to the normal direction to the panel member, of the side surface of the light guide plate, and the panel member In a cross section parallel to both the normal direction to the one direction and the one direction, the side surface of the connection element located on the other side in the one direction is the one direction from the light guide plate side to the body portion side. It may be inclined from one side to the other side.

In an optical device according to the invention,
A refractive index n1 of the connecting element;
In the cross section parallel to both the normal direction to the panel member and the one direction, along the panel surface of the panel member, from one side end of the connection point of the connection element to the light guide plate, A length la to the other side end of the connection portion to the main body, and
The distance d between the main body portion and the light guide plate along the normal direction to the panel member in a cross section parallel to both the normal direction to the panel member and the one direction has the following relationship: You may make it satisfy | fill.
sin ^-1 (1 / (n1)) ≥ tan ^-1 ((1a) / d)

In an optical device according to the invention,
A refractive index n1 of the connecting element;
A refractive index n2 of the light guide plate;
In the cross section parallel to both the normal direction to the panel member and the one direction, along the panel surface of the panel member, from one side end of the connection point of the connection element to the light guide plate, A length la to the other side end of the connection portion to the main body, and
The distance d between the main body portion and the light guide plate along the normal direction to the panel member in a cross section parallel to both the normal direction to the panel member and the one direction has the following relationship: You may make it satisfy | fill.
sin ^-1 (((n2) / (n1)) × sin (cos ^-1 (1 / (n2)))) ≥ tan ^-1 ((1a) / d)

  In the optical device according to the present invention, the second light source is disposed to face a portion located on the other side in the one direction among the side surfaces of the light guide plate, and the normal direction to the panel member and the one direction In the cross-section parallel to both, the side surface of the connecting element located on one side in the one direction is inclined from the other side in the one direction to the one side from the light guide plate side to the body portion side. You may do it.

In an optical device according to the invention,
A refractive index n1 of the connecting element;
In the cross section parallel to both the normal direction to the panel member and the one direction, along the panel surface of the panel member, the connection element is connected to the light guide plate from the other side end of the connection element. A length lb to one side end of the connection part to the main body,
The distance d between the main body portion and the light guide plate along the normal direction to the panel member in a cross section parallel to both the normal direction to the panel member and the one direction has the following relationship: You may make it satisfy | fill.
sin ^-1 (1 / (n1)) ≥ tan ^-1 ((1b) / d)

In an optical device according to the invention,
A refractive index n1 of the connecting element;
A refractive index n2 of the light guide plate;
In the cross section parallel to both the normal direction to the panel member and the one direction, along the panel surface of the panel member, the connection element is connected to the light guide plate from the other side end of the connection element. A length lb to one side end of the connection part to the main body,
The distance d between the main body portion and the light guide plate along the normal direction to the panel member in a cross section parallel to both the normal direction to the panel member and the one direction has the following relationship: You may make it satisfy | fill.
sin ^-1 (((n2) / (n1)) × sin (cos ^-1 (1 / (n2)))) ≥ tan ^-1 ((1b) / d)

  In the optical device according to the present invention, in the cross section parallel to both the normal direction to the panel member and the one direction, the connection element has a wide bottom bottom located on the side of the main body and a narrow top. You may have an isosceles trapezoid shape in which a bottom is located in the said light-guide plate side.

In an optical device according to the invention,
A refractive index n1 of the connecting element;
A width W1 of the upper base of the isosceles trapezoidal shape in a cross section parallel to both the normal direction to the panel member and the one direction;
A width W2 of the lower base of the isosceles trapezoidal shape in a cross section parallel to both the normal direction to the panel member and the one direction;
The distance between the main body portion and the light guide plate along the normal direction to the panel member in a cross section parallel to both the normal direction to the panel member and the one direction is d. You may make it satisfy | fill.
sin ^-1 (1 / (n1)) ≥ tan ^-1 (((W1) + (W2)) / (2 × d))

In an optical device according to the invention,
A refractive index n1 of the connecting element;
A refractive index n2 of the light guide plate;
A width W1 of the upper base of the isosceles trapezoidal shape in a cross section parallel to both the normal direction to the panel member and the one direction;
A width W2 of the lower base of the isosceles trapezoidal shape in a cross section parallel to both the normal direction to the panel member and the one direction;
The distance between the main body portion and the light guide plate along the normal direction to the panel member in a cross section parallel to both the normal direction to the panel member and the one direction is d. You may make it satisfy | fill.
sin ^-1 (((n2) / (n1)) × sin (cos ^-1 (1 / (n2)))) ≥ tan ^-1 (((W1) + (W2)) / (2 × d))

  In the optical device according to the present invention, the plurality of connection elements may be arranged in the one direction, and each connection element may extend in a direction non-parallel to the one direction.

  According to the present invention, the observed pattern can change depending on the incident state of light on the panel member. Therefore, this panel member can be utilized in various fields as a panel member having excellent design properties.

FIG. 1 is a side sectional view illustrating an optical device and a panel member for explaining an embodiment according to the present invention. FIG. 2 is a partially enlarged view of FIG. 1 for explaining the operation of the optical device and the panel member. FIG. 3 is a perspective view showing an optical sheet of the panel member of FIG. FIG. 4 is a plan view showing a first picture displayed by a first pattern formed on the first surface of the main body portion of the optical sheet. FIG. 5 is a plan view showing a second picture displayed by a second pattern formed on the second surface of the main body of the optical sheet. FIG. 6 is a plan view showing a pattern that can be observed on the panel member in an environment where external light can enter the panel member. FIG. 7 is a view showing the same cross section as FIG. 2 and is a view for explaining a modification of the pattern formed on the main body. FIG. 8 is a view showing the same cross section as FIG. 2 and is a view for explaining another modification of the pattern formed on the main body. FIG. 9 is a view showing the same cross section as FIG. 2 and is a view for explaining still another modified example of the pattern formed on the main body. FIG. 10 is a diagram illustrating a cross section similar to that of FIG. 2, and is a diagram for describing a modification of the optical sheet. FIG. 11 is a diagram corresponding to FIG. 1 and showing a modification of the optical device. FIG. 12 is a view corresponding to FIG. 1 and showing a modification of the 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.

  FIGS. 1-6 is a figure for demonstrating one Embodiment by this invention. Among these, FIG. 1 and FIG. 2 are longitudinal sectional views showing the optical device and the panel member. FIG. 3 is a perspective view showing an optical sheet of the panel member. 4-6 is a top view for demonstrating the pattern observed on the panel member 20. FIG. Note that the cross-sectional views of FIGS. 1 and 2 show a cross section taken along line XX in FIG.

  The optical device 10 and the panel member 20 according to the present embodiment described below are used as a lighting device, for example. As will be described later, the optical device 10 includes a pattern observed on the panel member 20 in an environment where external light is incident on the panel member 20, for example, during the daytime, and a pattern of the optical device 10, for example, at night. The pattern that is observed on the panel member 20 in an environment where only the light projected from the light source 15 enters the panel member 20 is different. That is, the optical device 10 can change the pattern displayed on the panel member 20 according to the condition of the incident light on the panel member 20. In this respect, the optical device 10 and the panel member 20 can perform display having excellent design properties. However, the following description is merely an example, and the optical device 10 and the panel member 20 may be used for applications other than the lighting device, such as wall materials, ceiling materials, floor materials capable of emitting light, and display devices for displaying information. It is also possible to use for the following purposes.

  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 guide plate” includes members called “light guide sheet” and “light guide film”, and the “optical sheet” is called “optical film”, “optical plate”, and the like. Members are also included.

  In this specification, “sheet surface (film surface, plate surface)” is the same as the planar direction of the target sheet-like member when the target sheet-like member is viewed as a whole and globally. It refers to the surface to be used. In the embodiment described below, the panel surface of the panel member 20, the plate surface of the light guide plate 30 described later, the first surface 31 of the light guide plate 30, the second surface 32 of the light guide plate 30, and the optical sheet 40 described later. The sheet surface, the sheet surface of the main body 50, the first surface 51 of the main body 50, and the second surface 52 of the main body 50 are parallel to each other.

  Furthermore, in this specification, the “normal direction of the panel member” refers to a normal direction to the sheet surface of the main body 50 of the optical sheet 40 that forms the outermost surface of the panel member 20 on the viewer side. Therefore, in the embodiment described below, the normal direction of the panel member 20 is parallel to the normal direction of the light guide plate 30 and the normal direction of the optical sheet 40.

  Furthermore, terms used in the present specification to specify shapes and geometric conditions, for example, terms such as “parallel”, “orthogonal”, “square”, “isosceles trapezoid”, and the like are bound to a strict meaning. Without being interpreted, the interpretation should include an error to the extent that a similar optical function can be expected.

  Hereinafter, configurations and operational effects of the optical device 10 and the panel member 20 according to the present embodiment will be described in detail. As shown in FIGS. 1 and 2, the optical device 10 includes a panel member (optical panel) 20 and a light source 15 that projects light onto the panel member 20. The panel member 20 includes an optical sheet 40 having a main body 50 and a plurality of connection elements 60 provided on the main body 50, and a light guide plate 30 disposed at a position facing the optical sheet 40. .

  By the way, in the example shown in figure, as shown in FIGS. 4-6, the optical sheet 40 and the light-guide plate 30 of the panel member 20 are formed in square shape. For this reason, the light guide plate 30 is configured as a rectangular plate-like member having a pair of main surfaces 31 and 32 as a whole, and the side surface defined between the pair of main surfaces includes four surfaces. And the light source 15 is provided facing a pair of side surfaces 33 and 34 which oppose the 1st direction d1 extended along the plate surface of the light-guide plate 30 among four side surfaces. In other words, the first light source 15a is provided opposite to the one side surface 33 located on one side in the first direction d1 of the light guide plate 30, and the other side surface located on the other side in the first direction d1 of the light guide plate 30. A second light source 15 b is provided so as to face 34.

  Each light source 15a, 15b extends linearly along a second direction d2 orthogonal to the first direction d1, and projects light over the entire side surfaces 33, 34 of the corresponding light guide plate 30. The 1st light source 15a and the 2nd light source 15b can be comprised by various aspects, such as fluorescent lamps, such as a linear cold cathode tube, point-like LED (light emitting diode), and an incandescent lamp, for example. In the present embodiment, each of the first light source 15a and the second light source 15b includes a large number of point light emitters arranged side by side along the longitudinal direction of the corresponding side surfaces 33 and 34 of the light guide plate 30, specifically, Is constituted by a large number of light emitting diodes (LEDs). FIG. 3 shows the arrangement positions of a large number of point-like light emitters 25 forming the second light source 15b.

  Next, the panel member 20 will be described. As described above, the panel member 20 includes the optical sheet 40 having the main body 50 and the plurality of connection elements 60 provided on the main body 50, the light guide plate 30 disposed at a position facing the optical sheet 40, and have. The optical sheet 40 includes a sheet-like main body 50 having a first surface 51 and a second surface 52 facing the first surface 51, and a plurality of connection elements 60 provided on the second surface 52 of the main body 50. And have.

  The light guide plate 30 is disposed on the side of the optical sheet 40 where the connection element 60 is provided, and is connected to the optical sheet 40 via the connection element 60. The connection here does not require the light guide plate 30 to be joined to the optical sheet 40 via the connection element 60, and the light guide plate 30 may be in contact with the connection element 60. The light guide plate 30 has a first surface 31 and a second surface 32 as a pair of main surfaces parallel to each other. The light guide plate 30 is disposed such that the first surface 31 faces the optical sheet 40.

  The light guide plate 30 guides light incident from the light source 15 and incident through the one side surface 33 and the other side surface 34 in the first direction d1. For this reason, it is preferable that the light guide plate 30 has excellent visible light transmittance. As an example, a transparent resin mainly composed of one or more of acrylic, styrene, polycarbonate, polyethylene terephthalate, acrylonitrile and the like can be suitably used. The thickness of the light guide plate 30 can be set to 0.5 mm to 6 mm.

  Next, the optical sheet 40 having the main body 50 and the connection element 60 will be described. The main body 50 has a first surface 51 and a second surface 52 as a pair of main surfaces parallel to each other. And the main-body part 50 is arrange | positioned so that the 2nd surface 52 may face the light-guide plate 30 side.

  In the present embodiment, the main body 50 has a light diffusion function for diffusing light. As shown in FIG. 2, the main body 50 has a main part 56 made of a base resin and a diffusion component 57 dispersed in the main part 56. The diffusing component 57 has an effect of changing the traveling direction of the light traveling in the main portion 56 by reflection or refraction. The light diffusing ability (light scattering ability) caused by such a diffusing component 57 can be obtained, for example, by configuring the diffusing component 57 from a material having a refractive index different from that of the material forming the main portion 56, or in the light. It can be applied by constructing the diffusing component 57 from a material that can have a reflective effect on it. In the drawings other than FIG. 2, the diffusion component 57 is not shown.

  Next, the connection element 60 provided on the 2nd surface 52 which makes the main surface which faces the light-guide plate 30 of the main-body part 50 is demonstrated. As will be described later, the connecting element 60 is connected to the light guide plate 30 and exhibits a function of extracting light guided in the light guide plate 30 from the light guide plate 30 to the optical sheet 40.

  As shown in FIGS. 2 and 3, the second surface 52 of the main body 50 includes a first region 52a and a second region 52b, and the connecting element 60 is located on the first region 52a. As well shown in FIGS. 2 and 3, the connecting element 60 includes a first surface 61 located on the first region 52 a of the second surface 52 of the main body 50, and a first surface facing the first surface 61. Two surfaces 62. The connection element 60 is connected to the first surface 31 of the light guide plate 30 on the second surface 62. The first surface 31 of the light guide plate 30 includes a first region 31 a and a second region 31 b, and the first region 31 a is connected to the second surface 62 of the connection element 60.

  The plurality of connection elements 60 are arranged apart from each other along the panel surface of the panel member 20 between the light guide plate 30 and the main body 50. A gap is formed between the second region 52 b of the second surface 52 of the main body 50 and the second region 31 b of the first surface 31 of the light guide plate 30.

  In the present embodiment, the plurality of connection elements 60 are arranged with a gap in the first direction d1. Each connection element 60 extends in a direction non-parallel to the first direction d1. In particular, in the present embodiment, the plurality of connection elements 60 are arranged at a constant pitch in the first direction d1. Further, as well shown in FIG. 3, each connection element 60 extends linearly along a second direction d <b> 2 that extends perpendicular to the first direction d <b> 1 and parallel to the panel surface of the panel member 20. Yes. In addition, each connection element 60 is formed in a columnar shape and has the same cross-sectional shape along the longitudinal direction thereof. Further, in the present embodiment, the plurality of connection elements 60 are configured identically to each other.

  Next, a cross-sectional shape of the connection element 60 in a cross section along the first direction d1 that is a direction in which light from the light source 15 is mainly guided will be described. In the cross section shown in FIGS. 1 and 2, that is, a cross section parallel to both the normal direction nd and the first direction d1 of the panel member 20 (hereinafter referred to simply as “the main cutting surface of the panel member” or “of the optical sheet”). The cross-sectional shape of each connection element 60 is a quadrangular shape. The rectangular shape includes a first surface 61 disposed on the second surface 52 of the main body 50, a second surface 62 disposed on the first surface 31 of the light guide plate 30, the main body 50 and the connection element 60. And a pair of side surfaces 63 and 64 extending between them.

  The pair of side surfaces 63 and 64 change the traveling direction of the light incident from the light guide plate 30 into the connection element 60 by reflection, particularly total reflection due to the difference in refractive index. At this time, the pair of side surfaces 63 and 64 of the connection element 60 change the traveling direction of the light so that the angle formed by the traveling direction of the light with respect to the normal direction nd of the panel member 20 becomes small. Thereby, the light extracted from the light guide plate 30 to the optical sheet 40 via the connection element 60 changes the traveling direction and is emitted from the panel member 20 via the first surface 51 of the main body 50.

  If the angle formed by the light traveling direction with respect to the normal direction nd of the panel member 20 cannot be sufficiently reduced by the pair of side surfaces 63 and 64, the light is transmitted through the first surface 51 of the main body 50. In addition, the light is totally reflected on the second surface 52 of the main body 50 incident thereafter and cannot be emitted from the panel member 20.

  In the illustrated example, the other side surface 62 of the connection element 60 located on the other side in the first direction d1 on the main cut surface of the panel member is the first from the light guide plate 30 side toward the main body portion 50 side. It is inclined from one side to the other side in the direction d1. According to this configuration, as shown in FIG. 1, the traveling direction of light projected from the first light source 15 a into the light guide plate 30 and then incident on the connection element 60 is effectively changed, and the main body portion The light can be emitted from the panel member 20 through the 50 first surfaces 51.

  Similarly, in the illustrated example, one side surface 63 of the connection element 60 located on one side in the first direction d1 on the main cut surface of the panel member is directed from the light guide plate 30 side to the main body 50 side. And tilted from one side to the other in one direction. According to this configuration, the first surface 51 of the main body 50 is changed by effectively changing the traveling direction of the light projected from the second light source 15b into the light guide plate 30 and then incident on the connection element 60. Through the panel member 20.

Moreover, in this Embodiment, from the one side end of the connection location to the light-guide plate 30 of the connection element 60 along the panel surface of the panel member 20 in the refractive index n1 of the connection element 60 and the main cut surface of a panel member. A length la (see FIG. 2) to the other side end of the connection portion of the connection element 60 to the main body 50, and the main body 50 along the normal direction nd to the panel member at the main cutting surface of the panel member, The distance d between the light guide plate 30 and the light guide plate 30 satisfies the following condition (a).
sin ^-1 (1 / (n1)) ≥ tan ^-1 ((1a) / d) (a)
Similarly, the connection location of the connection element 60 from the other side end of the connection element 60 to the light guide plate 30 along the panel surface of the panel member 20 on the main cut surface of the panel member 20. The length lb to one end (see FIG. 2) and the refractive index n1 and distance d used in the condition (a) satisfy the following condition (b).
sin ^-1 (1 / (n1)) ≥ tan ^-1 ((1b) / d) (b)
According to such a configuration, the light L22 (see FIG. 2) that is totally reflected by the second surface 32 of the light guide plate 30 and is incident on the connection element 60 is incident on the side surfaces 63 and 64 of the connection element 60. Thus, the traveling direction of the light L22 can be changed by the side surfaces 63 and 64.

In addition, in the present embodiment, the refractive index n2 of the light guide plate and the refractive index n1, length la, and distance d used in the condition (a) satisfy the following condition (c).
sin ^-1 (((n2) / (n1)) x sin (cos ^-1 (1 / (n2)))) ≥ tan ^-1 ((1a) / d) (c)
Similarly, the refractive index n1, the refractive index n2, the length lb, and the distance d used in the conditions (a) to (c) satisfy the following condition (d).
sin ^-1 (((n2) / (n1)) x sin (cos ^-1 (1 / (n2)))) ≥ tan ^-1 ((1b) / d) (d)
According to such a configuration, the light L21 (see FIG. 2) that enters the light guide plate 30 through the one side surface 33 and enters the connection element 60 without being reflected by the main surfaces 31 and 32, It will enter into the side surfaces 63 and 64 of the connection element 60, and, thereby, the advancing direction of the said light L21 can be changed by the said side surfaces 63 and 64. FIG.

  In the present embodiment, the optical device 10 is configured symmetrically with the center position in the first direction as the center. Therefore, the cross-sectional shape of the connection element 60 is an isosceles trapezoidal shape in the main cut surface of the panel member. The isosceles trapezoidal shape includes a first surface 61 as a wide lower base disposed on the second surface 52 of the main body 50 and a narrow upper base disposed on the first surface 31 of the light guide plate 30. As a second surface 62.

In the configuration in which the cross-sectional shape of the connecting element 60 is an isosceles trapezoidal shape, the length la and the length lb used in the above-described conditions (a) to (d) are equal to those of the upper base of the isosceles trapezoidal shape on the main cutting plane. Using the width W1 and the width W2 of the lower base, it is expressed as “((W1) + (W2)) / 2”. That is, in the present embodiment, the following condition (e) corresponding to the above-described conditions (a) and (b) is satisfied, and the following condition (c) and (d) corresponding to the above-described conditions (e) ( e) is satisfied.
sin ^-1 (1 / (n1)) ≥ tan ^-1 (((W1) + (W2)) / (2 × d)) (e)
sin ^-1 (((n2) / (n1)) × sin (cos ^-1 (1 / (n2)))) ≥ tan ^-1 (((W1) + (W2)) / (2 × d))
... (f)

  The dimensions of the optical sheet 40 having the above-described configuration can be set as follows as an example. First, as a specific example of the connection element 60, the width W1 (see FIG. 2) of the first surface 61 on the second surface 52 of the main body 50 is set to 0.01 mm or more and 0.05 mm or less, and the first surface of the light guide plate 30 is used. The width W2 (see FIG. 2) of the second surface 62 on 31 is set to 0.024 mm or more and 0.12 mm or less, and the height d of the connecting element 60 between the light guide plate 30 and the main body 50 is set to 0.02 mm or more. It can be 0.1 mm or less. Moreover, the thickness of the main-body part 50 can be 0.05 mm or more and 0.5 mm or less.

  Moreover, the optical sheet 40 as described above can be produced by molding the connection element 60 on a base material. As the base material, a film made of a transparent resin containing at least one of acrylic, styrene, polycarbonate, polyethylene terephthalate, acrylonitrile and the like as a main component can be used. Epoxy acrylate and urethane acrylate-based reactive resins (such as ionizing radiation curable resins) can be suitably used as the material to be molded on the substrate. In an example of this manufacturing method, the main body 50 may be formed only from the base material, or may be formed from the base material and a resin portion molded in a sheet shape on the base material. It may be.

  On the other hand, the diffusion component 57 may be mixed in the base material in advance. For example, silica (silicon dioxide), alumina (aluminum oxide), acrylic resin, polycarbonate resin having an average particle size of about 0.5 to 100 μm. Particles made of a transparent substance such as a silicone resin can be used. The diffusion component 57 may be a simple bubble.

  By the way, in the optical sheet 40 described here, at least one of the first surface 51 of the main body 50 and the second region 52b of the second surface 52 of the main body where the connection element 60 is not provided. A pattern 80 for displaying the pattern 80a is formed. In the present embodiment, as shown in FIG. 2, the first pattern 81 is formed on the first surface 51 of the main body 50, and the second pattern 82 is formed on the second region 52 b of the second surface 52. Yes. Note that the pattern used in the present specification is not limited to the one indicating specific information or meaning the specific information, but is particularly limited to a figure, a character, a pattern, a pattern, a symbol, a pattern, a mark, a color, and the like. Including widely without.

  In the present embodiment, the second surface 52 of the main body 50 is divided into a first region 52a to which the connection element 60 is connected and a second region 52b to which the connection element 60 is not connected. Therefore, the second pattern 82 is formed only on the second region 52 b of the second surface 52. The second pattern 82 formed in the second region 52 b of the second surface 52 that is not connected to the first surface 61 of the connection element 60 is not illuminated by the light extracted from the light guide plate 30 via the connection element 60. For this reason, the second pattern 82 is not visually recognized by the light from the light source 15, but is external light (environment light) of the environment in which the panel member 20 is disposed, for example, sunlight or other lighting device It will be visually recognized by the light from.

  FIG. 5 shows an example of the second picture 82 a displayed by the second pattern 82. In the example shown in FIG. 5, the sun is displayed by the second pattern 82. The second regions 52b of the second surface 52 where the second pattern 82 is formed are arranged with a gap in the first direction d1. However, when the total area of the second regions 52b in the second surface 52 is a sufficient area and the arrangement pitch of the second regions 52b in the first direction d1 is sufficiently small, the second pattern 82 It is possible to display a continuous pattern in which the observer cannot perceive the cut along the first direction d1, for example, the sun picture shown in FIG.

  On the other hand, the 1st pattern 81 is formed in the 1st field 51a on the 1st surface 51 opposite to the 1st field 52a provided with connection element 60 of the 2nd surface 52 at least. In the present embodiment, the first surface 51 of the main body 50 includes a first region 51 a that faces the first region 52 a of the second surface 52 and a second region 52 b that faces the second region 52 b of the second surface 52. It is divided into a region 51b. As shown in FIG. 2, the first pattern 81 is mainly formed on the first region 51 a on the first surface 51 of the main body 50, but the adjacent first region 51 a of the second regions 51 b. It is also formed in the vicinity.

  The first pattern 81 formed at least in the first region 51 a of the first surface 51 facing the first region 52 a of the second surface 52 is guided by the connecting element 60 connected to the first region 52 a of the second surface 52. Illuminated by light extracted from 30. For this reason, the first pattern 81 can be visually recognized by the ambient light in the environment where the panel member 20 is disposed, and can also be visually recognized by the light from the light source 15.

  FIG. 4 shows an example of the first picture 81 a displayed by the first pattern 81. In the example shown in FIG. 4, Mt. Fuji is displayed by the first pattern 81. The region of the first surface 51 where the first pattern 81 is formed is arranged with a gap in the first direction d1. However, when the total area of the region in the first surface 51 is a sufficient area and the arrangement pitch of the region in the first direction d1 is sufficiently small, the first pattern 81 allows the observer to It is possible to display a continuous pattern incapable of detecting a cut along one direction d1, for example, a picture of Mt. Fuji shown in FIG.

  The patterns 80, 81, 82 are formed in a predetermined region on the main body 50 of the optical sheet 40 by a known means such as printing. The patterns 80, 81, and 82 may be formed after the optical sheet 40 is manufactured or during the manufacturing of the optical sheet 40.

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

  First, when the panel member 20 that constitutes the light emitting surface of the lighting device is disposed in a bright environment, that is, external light, in other words, ambient light such as sunlight or illumination light is emitted from the panel member 20. Let us consider the case where the light is incident on. In this case, external light illuminates the first pattern 81 formed on the first surface 51 of the main body 50, and the second surface of the main body 50 by the external light transmitted through the light-transmissive main body 50. The second pattern 82 formed in 52 is illuminated. Therefore, the person observing the panel member 20 can observe the first pattern 81 a displayed by the first pattern 81 and the second pattern 81 b displayed by the second pattern 82. That is, under the condition that external light can be inserted into the panel member 20 of the optical device 10, as shown in FIG. 6, Mt. Fuji as the first pattern 81a and the sun as the second pattern 82a are the panel members. 20 will be observed.

  Next, the panel member 20 that constitutes the light-emitting surface of the lighting device is disposed in a dark environment, that is, external light, in other words, ambient light such as sunlight or illumination light is sufficient for the panel member 20. The case where light is projected from the light source 15 of the optical device 10 without being incident on the light source will be described.

  The light emitted from the light emitters forming the light sources 15 a and 15 b enters the light guide plate 30 through the light incident surfaces 33 and 34. 1 and 2 show an example in which light is incident on the light guide plate 30 from the first light source 15a via the one side surface 33, as an example. The operation of the optical device 10 and the panel member 20 will be described below based on the example shown in FIG. However, the light guide plate 30, the panel member 20 including the light guide plate 30, and the optical device 10 have a symmetric configuration with the center position in the first direction d1 as the center. Due to the symmetry of this configuration, the following description applies to the light incident on the light guide plate 30 from the second light source 15b via the other side surface 34 as well.

  As shown in FIG. 1, the light L11, L12, L13, and L14 incident on the light guide plate 30 is reflected on the light exit surface 31 and the back surface 32 of the light guide plate 30, and particularly the refractive index of the material forming the light guide plate 30 and air. The total reflection is repeated due to the difference, and proceeds in the first direction (light guide direction) d1 connecting the one side surface 33 and the other side surface (opposite surface) 34 of the light guide plate 30.

  However, the light guide plate 30 is connected to the connection element 60 on the first surface 31 thereof. For this reason, as shown in FIG. 1, when the light L11 to L14 traveling in the light guide plate 30 is incident on the second region 31b of the first surface 31 of the light guide plate 30 that does not face the connection element 60, Although it is totally reflected by the surface 31, when it enters the first region 31 a facing the connection element 60 in the first surface 31 of the light guide plate 30, it exits the light guide plate 30 and enters the connection element 60.

  As shown in FIG. 2, a part of the light L <b> 21 emitted from the light source 15 a is incident on the light guide plate 30 through the one side surface 33 and then directly enters the first region 31 a of the first surface 31. To do. That is, a part of the light L21 emitted from the light source 15a exits the light guide plate 30 and enters the connection element 60 without being totally reflected in the light guide plate 30.

  Note that the connection elements 60 are arranged along the first direction d1. Therefore, the light emitted from the first light source 15 a and incident on the light guide plate 30 is gradually emitted from each position along the first direction d 1 of the first surface 31 of the light guide plate 30. As a result, the amount of light incident on the optical sheet 40 from the light guide plate 30 is substantially uniform along the first direction d1.

  As shown well in FIG. 2, the light traveling from one side to the other side along the first direction d <b> 1 in the light guide plate 30 enters the connection element 60 and then enters the other side surface 64 of the connection element 60. To do. The other side surface 64 of the connection element 60 is inclined from one side to the other side in the first direction d1 from the light guide plate 30 side toward the main body 50 side on the main cut surface of the panel member. Therefore, the traveling direction of the light projected from the first light source 15a into the light guide plate 30 and subsequently incident on the connection element 60 is changed so that the inclination angle with respect to the normal direction nd of the panel member 20 becomes small. Can do.

  In the main cut surface of the panel member, one side surface 63 of the connection element 60 is inclined from the other side in one direction to the one side from the light guide plate 30 side to the main body 50 side. Therefore, the traveling direction of the light projected from the second light source 15b into the light guide plate 30 and subsequently incident on the connection element 60 is changed so that the inclination angle with respect to the normal direction nd of the panel member 20 becomes small. Can do.

In the present embodiment, as described above, the connecting element 60 is configured to satisfy the condition (a).
sin ^-1 (1 / (n1)) ≥ tan ^-1 ((1a) / d) (a)
When this condition (a) is satisfied, as will be described below, light that is totally reflected by the second surface 32 of the light guide plate 30 and then passes through the first region 31a of the first surface 31 and enters the connection element 60. L22 is incident on the other side surface 64 in the connection element 60, so that its traveling direction is effectively changed and emitted from the panel member 20 through the first surface 51 of the main body 50. Become.

As shown in FIG. 2, the light L <b> 22 incident on the connection element 60 is incident on the other side surface 64 due to the angle θx formed by the traveling direction of the light traveling in the connection element 60 and the normal direction nd of the panel member 20. Is equal to or larger than an angle θz formed by a direction connecting one end of the second surface 62 of the connecting element 60 and the other end of the first surface 61 of the connecting element 60 and the normal direction nd of the panel member 20. It is. The light L22 having the smallest angle θx is light that enters the second surface 32 of the light guide plate 30 at the total reflection critical angle θa, is totally reflected by the second surface 32, and then enters the connection element 60. is there. The total reflection critical angle θa and the angle θx are expressed as follows using the refractive index n1 of the connection element 60 and the refractive index n2 of the light guide plate 30.
θa = sin ^-1 (1 / (n2))
θx = sin ^-1 (((n2) × sinθa) / (n1)) = sin ^-1 (1 / (n1))
On the other hand, the angle θz is determined by the length la from the one side end of the second surface 62 of the connecting element 60 to the other side end of the first surface 61 of the connecting element 60 and the panel member at the main cutting surface of the panel member. It is expressed as follows using the thickness d of the connecting element along the normal direction nd.
θz = tan ^-1 ((1a) / d)
Therefore, according to the configuration in which the above-described condition (a) is satisfied, the first surface 31 has the first surface 31 after being totally reflected by the second surface 32 of the light guide plate 30 while proceeding from one side to the other side in the first direction d1. The light L <b> 22 that passes through the one region 31 a and enters the connection element 60 enters the other side surface 64 in the connection element 60.

Similarly, in the present embodiment, as described above, the connection element 60 is configured to satisfy the condition (b).
sin ^-1 (1 / (n1)) ≥ tan ^-1 ((1b) / d) (b)
According to the configuration in which this condition (b) is satisfied, the first region 31a of the first surface 31 after being totally reflected by the second surface 32 of the light guide plate 30 while proceeding from the other side to the one side in the first direction d1. The light incident on the connecting element 60 through the first incident light enters the one side surface 63 in the connecting element 60, thereby effectively changing the traveling direction of the first surface 51 of the main body 50. Then, the light is emitted from the panel member 20.

Further, in the present embodiment, as described above, the connection element 60 is configured to satisfy the condition (c).
sin ^-1 (((n2) / (n1)) x (cos ^-1 (1 / (n2)))) ≥ tan ^-1 ((1a) / d) (c)
When this condition (c) is satisfied, the connection element enters the light guide plate 30 through the one side surface 33 and is not totally reflected by the second surface 32 of the light guide plate 30 thereafter, as will be described below. The light L <b> 21 incident on 60 enters the other side surface 64 in the connection element 60, thereby effectively changing the traveling direction thereof, and the panel member 20 via the first surface 51 of the main body 50. It comes out from.

The light L21 incident on the connection element 60 is incident on the other side surface 64 because the angle θy formed by the traveling direction of the light traveling in the connection element 60 and the normal direction nd of the panel member 20 is the first of the connection elements 60. This is a case where the angle θz is greater than or equal to the direction connecting the one side end of the second surface 62 and the other side end of the first surface 61 of the connection element 60 and the normal direction nd of the panel member 20. The light L21 having the smallest angle θy is light incident on the one side surface 33 of the light guide plate 30 at an incident angle of substantially 90 °. The angle θb and the angle θy formed by the traveling direction of the light L21 in the light guide plate 30 and the normal direction nd of the panel member 20 are determined using the refractive index n1 of the connection element 60 and the refractive index n2 of the light guide plate 30. It is expressed as follows.
θb = cos ^-1 (1 / (n2))
θy = sin ^-1 (((n2) × sinθb) / (n1))
= sin ^-1 (((n2) / (n1)) × sin (cos ^-1 (1 / (n2))))
On the other hand, the angle θz is determined by the length la from the one side end of the second surface 62 of the connecting element 60 to the other side end of the first surface 61 of the connecting element 60 and the panel member at the main cutting surface of the panel member. It is expressed as follows using the thickness d of the connecting element along the normal direction nd.
θz = tan ^-1 ((1a) / d)
Therefore, according to the configuration in which the above-described condition (c) is satisfied, light that enters the light guide plate 30 via the one side surface 33 and then enters the connection element 60 without being totally reflected by the second surface 32. L <b> 21 enters the other side surface 64 in the connection element 60.

Similarly, in the present embodiment, as described above, the connection element 60 is configured to satisfy the condition (d).
sin ^-1 (((n2) / (n1)) x sin (cos ^-1 (1 / (n2)))) ≥ tan ^-1 ((1b) / d) (d)
According to the configuration in which the condition (d) is satisfied, light that enters the light guide plate 30 through the other side surface 34 and then enters the connection element 60 without being totally reflected by the second surface 32 is connected. The light enters the side surface 63 in the element 60, changes its traveling direction effectively, and exits from the panel member 20 through the first surface 51 of the main body 50.

In addition, according to the present embodiment, the cross-sectional shape of the connection element 60 is an isosceles trapezoidal shape, and the length la and the length lb used in the conditions (a) to (d) are equal to each other on the main cut surface. Using the upper base width W1 and the lower base width W2 of the leg trapezoidal shape, it is expressed as “((W1) + (W2)) / 2”. Then, the next condition (e) corresponding to the above-described conditions (a) and (b) is satisfied, and the next condition (e) corresponding to the above-described conditions (c) and (d) is satisfied.
sin ^-1 (1 / (n1)) ≥ tan ^-1 (((W1) + (W2)) / (2 × d)) (e)
sin ^-1 (((n2) / (n1)) × sin (cos ^-1 (1 / (n2)))) ≥ tan ^-1 (((W1) + (W2)) / (2 × d))
... (f)

  As described above, the light extracted from the light guide plate 30 to the connection element 60 is totally reflected by the side surfaces 63 and 64 of the connection element 60, whereby the traveling direction of the light is the normal direction of the panel member 20. The angle formed with respect to nd is reduced. In the optical sheet 40, the lights L <b> 21 and L <b> 22 travel from the connection element 60 into the main body 50 and then exit from the panel member 20 through the first surface 51 of the main body 50. As shown in FIG. 2, in the present embodiment, the main body 50 has a light diffusion function, and light emitted from the panel member 20 through the main body 50 is diffused to some extent, The light is emitted in an angular range having a certain extent.

  As described above, the light emitted from the first light source 15a and the second light source 15b is emitted from the panel member 20 as illumination light. The amount of light emitted from the panel member 20 and the emission direction are made uniform to some extent in the plane. And the environment where the panel member 20 is arrange | positioned can be illuminated with this illumination light.

  By the way, the emitted light from the panel member 20 mainly passes through a portion facing the connection element 60 in the main body 50 and first faces the connection element 60 in the first surface 51 of the main body 50. The light is emitted from the panel member 20 through the region 51a. That is, the emitted light from the panel member 20 passes through the first pattern 81 formed on the first region 51 a of the first surface 51 of the main body 50. Therefore, the person who observed the panel member 20 can recognize the first picture 81 a displayed by the first pattern 81.

  On the other hand, the light from the light source 15 cannot substantially enter the portion of the main body 50 of the optical sheet 40 that does not face the connection element 60. For this reason, the second pattern 82 formed in the second region 52 b of the second surface 52 of the main body 50 is not illuminated by the light from the light source 15. Further, since the panel member 20 is disposed in a dark environment, the second pattern 82 is not sufficiently illuminated by external light. For this reason, the person who observed the panel member 20 does not recognize the second picture 82a displayed by the second pattern 82.

  That is, the panel member 20 is disposed in a dark environment, that is, external light, in other words, ambient light such as sunlight or illumination light is not sufficiently incident on the panel member 20, and the light source 15 of the optical device 10 is used. When the light is projected from the light source, the optical device 10 can perform illumination using the light from the light source 15. In addition, as shown in FIG. 5, Mt. Fuji as the first pattern 81 a is observed on the panel member 20, but the sun as the second pattern 82 a cannot be observed on the panel member 20. .

  According to the present embodiment as described above, the pattern 20 that can be observed on the panel member 20 can change depending on the incident state of light on the panel member 20, particularly depending on the presence or absence of external light. Such a display method is surprising and can exhibit excellent design. Therefore, the panel member 20 can be used in various fields as a panel member having excellent design properties.

  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 embodiment are used for the parts that can be configured in the same manner as in the above embodiment. A duplicate description is omitted.

  First, in the above-described embodiment, the first pattern 81 is formed mainly in the first region 51 a of the first surface 51 of the main body 50, and the second pattern 82 is formed on the second surface 52 of the main body 50. The example formed in the 2nd field 52b of them was shown. In this example, under the condition that external light can enter the panel member 20, the first pattern 81a displayed by the first pattern 81 and the second pattern 82a displayed by the second pattern 82 are observed, while The first pattern 81a is observed under conditions where the external light cannot sufficiently enter the panel member 20 and the light source 15 projects light, but the second pattern 82a cannot be sufficiently observed. become. However, the present invention is not limited to this example, and the pattern 80 may be formed as follows.

  In the example shown in FIG. 7, the first pattern 81 is formed in the first region 51 a on the first surface 51 of the main body 50, and the second pattern 82 is formed in the second region 51 b on the first surface 51 of the main body 50. Is formed. According to the example shown in FIG. 7, the first picture 81 a displayed by the first pattern 81 and the second picture 82 a displayed by the second pattern 82 under conditions where external light can enter the panel member 20. Is observed. On the other hand, under conditions where the external light cannot sufficiently enter the panel member 20 and the light source 15 is projecting light, the light from the light source causes the first region 51a facing the connection element 60 to be exposed. The formed first pattern 81 is illuminated. As a result, the first pattern 81a is observed, but the second pattern 82a cannot be sufficiently observed. In such an example, as in the above-described embodiment, the pattern displayed by the combination of the first pattern 81 and the second pattern 82 is different from the pattern displayed by the first pattern 81 alone. Therefore, high designability can be ensured.

  In the example shown in FIG. 8, the pattern 80 is formed in the second region 52 b of the second surface 52 of the main body 50 where the connection element 60 is not provided, and is formed in the second region 52 b of the second surface 52. It is not formed in the 2nd field 51b on the 1st surface 51 which counters. Further, the pattern 80 is not formed in the second region 51 b on the first surface 51. That is, the pattern 80 is formed only in the second region 52b in the second surface 52 of the main body 50 where the connection element 60 is not provided. According to the example shown in FIG. 8, the pattern 80 a displayed by the pattern 80 is observed under a condition that external light can enter the panel member 20. On the other hand, the pattern 80a cannot be sufficiently observed on the panel member 20 under conditions where the external light cannot sufficiently enter the panel member 20 and the light source 15 projects the light. Therefore, at this time, the optical device 10 functions as a simple illumination device. Even in such an example, high designability can be ensured as in the above-described embodiment.

  In the example shown in FIG. 9, the pattern 80 includes only the second region 51 b on the first surface 51 that faces the second region 52 b of the second surface 52 of the main body 50 where the connection element 60 is not provided. Is formed. According to the example shown in FIG. 9, the pattern 80 a displayed by the pattern 80 is observed under a condition where external light can enter the panel member 20. On the other hand, the pattern 80a cannot be sufficiently observed on the panel member 20 under conditions where the external light cannot sufficiently enter the panel member 20 and the light source 15 projects the light. Therefore, at this time, the optical device 10 functions as a simple illumination device. Even in such an example, high designability can be ensured as in the above-described embodiment.

  In the above-described embodiment, the first pattern 81a displayed by the first pattern 81 is Mt. Fuji, and the second pattern 82a displayed by the second pattern 82 is the sun. Not limited to. For example, the first pattern 81 may be a simple color, and the second pattern 82 may be a simple color different from the first pattern 81. According to this example, the color of the panel member 20 combined with the first pattern 81 and the second pattern 82 is different from the color of the panel member 20 based on the first pattern 81 alone. Even in such an example, high designability can be ensured as in the above-described embodiment.

  In embodiment mentioned above, although the main-body part 50 showed the example which has a light-diffusion function by containing the diffusion component 57, it is not restricted to this. For example, as shown in FIG. 10, the first surface 51 of the main body 50 is configured as a rough surface or a matte surface including unevenness that exhibits a light diffusion function, thereby providing the main body 50 with a light diffusion function. May be.

  In addition, the main body 50 does not need to exhibit the light diffusion function on the entire surface thereof. For example, only the portion of the main body 50 facing the connection element 60 may be provided with the light diffusion function. Also in such an example, the light emission angle range from the light source 15 can be effectively expanded. In the example shown in FIG. 10, only the first region 51 a facing the connection element 60 in the first surface 51 of the main body 50 is a rough surface or a mat surface including unevenness that exhibits a light diffusion function. It is comprised and can exhibit the light-diffusion function.

  Furthermore, in embodiment mentioned above, although an example of the cross-sectional shape of the connection element 60 in the main cut surface of the panel member 20 was demonstrated, it is not restricted to this, A various change is possible. For example, the side surface 63 and the other side surface 64 of the connection element 60 are shown as being formed as flat surfaces. However, the present invention is not limited thereto, and one or more of the one side surface 63 and the other side surface 64 of the connection element 60 may be curved surfaces or It may be configured as a folded surface.

  Furthermore, in the above-described embodiment, the example in which the plurality of connection elements 60 are configured identically to each other has been described, but the present invention is not limited thereto. Moreover, although the example in which the several connection element 60 was arranged in the 1st direction d1 with the fixed pitch was shown, it is not restricted to this. The shape of the connection elements 60 and the arrangement pitch of the connection elements 60 may be changed according to the distance along the first direction d1 from the first light source 15a or the second light source 15b.

  In the above-described embodiment, the example in which the side surfaces 63 and 64 of the connection element 60 are not parallel to the normal direction nd of the panel member is shown. However, the present invention is not limited to this example. Thus, it may be parallel to the normal direction nd of the panel member. When the main body 50 has a light diffusion function, at least a part of the light reflected by the side surfaces 63 and 64 of the connection element 60 is then totally reflected by the first surface 51 of the main body 50. Instead, the light is emitted from the panel member 20 through the first surface 51.

  Furthermore, in the above-described embodiment, the example in which each connection element 60 extends linearly and the plurality of connection elements 60 are arranged in a one-dimensional array (linear array array) is shown, but the present invention is not limited thereto. Each connection element 60 may be formed in a dot shape, and each connection element 60 may be arranged in a two-dimensional array.

  Further, in the above-described embodiment, the example in which the first light source 15a and the second light source 15b are provided so as to face the pair of side surfaces 33 and 34 facing the first direction d1 of the light guide plate 30, respectively. Not limited to this, the first light source 15a or the second light source 15b may be omitted.

  Furthermore, in the above-described embodiment, as shown in FIG. 11, the reflecting member 70 may be provided at a position facing the second surface 32 of the light guide plate 30 so as to be separated from the second surface 32. The reflecting member 70 has a function of reflecting light, and returns light that has been unintentionally emitted from the second surface 32 of the light guide plate 30 into the light guide plate 30 again. Thereby, the effective use of the light from the light source 15 can be aimed at.

  Furthermore, in the above-described embodiment, as shown in FIG. 12, the second optical sheet 140 may be provided on the second surface 32 side of the light guide plate 30. The second optical sheet 140 is disposed symmetrically with the optical sheet 40 described above with the light guide plate 30 as the center, and may be configured in the same manner as the optical sheet 40 described above. Therefore, the second optical sheet 140 includes a main body 50 having the first surface 51 and the second surface 52 facing the first surface 51, and a plurality of connection elements provided on the second surface 52 of the main body 50. 60 may be included. And at least one of the 1st surface 51 of the main-body part 50 of the 2nd optical sheet 140 and the area | region in which the connection element 60 of the 2nd surface 52 of the main-body part 50 of the optical sheet 40 is not provided is a pattern. A pattern for displaying may be formed. According to such an example, the optical device 10 can be used as an illumination device that illuminates both sides of the panel member 20.

  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.

10 optical device 15 light source 15a first light source 15b second light source 20 panel member, optical panel 30 light guide plate 31 first surface 31a first region 31b second region 32 second surface 33 one side surface 34 other side surface 40 optical sheet, Light control sheet 50 Main body 51 First surface, light exit side surface 51a First region 51b Second region 52 Second surface, light incident side surface 52a First region 52b Second region 56 Main portion 57 Diffusion component 60 Connection element 61 First surface , Lower bottom, light exit side surface 62 second surface, upper bottom, incident light side surface 64 one side surface 65 other side surface 70 reflecting member 80 pattern 80a pattern 81 first pattern 81a first pattern 82 second pattern 82a second pattern 140 optical sheet, Second optical sheet

Claims (20)

An optical sheet having a first surface and a main body portion having a second surface facing the first surface; and a plurality of connecting elements provided on the second surface of the main body portion;
A light guide plate disposed on a side of the optical sheet on which the connection element is provided,
For displaying a pattern on at least one of the first surface of the main body portion of the optical sheet and the area of the second surface of the main body portion of the optical sheet where no connection element is provided. A panel member on which a pattern is formed.   The panel member according to claim 1, wherein a first pattern is formed on the first surface, and a second pattern is formed on a region of the second surface where no connection element is provided.   3. The panel member according to claim 2, wherein the first pattern is formed at least in a region on the first surface facing a region of the second surface where a connection element is provided.   The pattern is formed in a region of the second surface where a connection element is not provided, and is formed in a region on the first surface opposite to a region of the second surface where a connection element is not provided. The panel member according to any one of claims 1 to 3, wherein is not formed. A first pattern is formed in a region on the first surface facing a region of the second surface where the connection element is provided,
A second pattern is formed in a region on the first surface facing a region of the second surface where no connection element is provided;
The panel member according to claim 1, wherein a picture displayed by a combination of the first pattern and the second pattern is different from a picture displayed by the first pattern.   The panel member according to claim 1, wherein the pattern is formed only in a region of the second surface where a connection element is not provided.   2. The panel member according to claim 1, wherein the pattern is formed only in a region on the first surface facing a region of the second surface where no connection element is provided.   The panel member according to claim 1, wherein the main body portion of the optical sheet has a diffusion function of diffusing light.   The unevenness | corrugation for diffusing light is formed in the area | region on the said 1st surface facing the area | region in which the connection element is provided among the said 2nd surface. The panel member as described in. A panel member according to any one of claims 1 to 9, and
An optical device comprising: a light source disposed to face a side surface of the light guide plate of the panel member. The light source is disposed to face a portion located on one side in one direction orthogonal to the normal direction to the panel member of the side surface of the light guide plate,
In a cross section parallel to both the normal direction to the panel member and the one direction, the side surface of the connection element located on the other side in the one direction is directed from the light guide plate side to the body portion side. The optical device according to claim 10, wherein the optical device is inclined from one side to the other side in the one direction. A refractive index n1 of the connecting element;
In the cross section parallel to both the normal direction to the panel member and the one direction, along the panel surface of the panel member, from one side end of the connection point of the connection element to the light guide plate, A length la to the other side end of the connection portion to the main body, and
The distance d between the main body portion and the light guide plate along the normal direction to the panel member in a cross section parallel to both the normal direction to the panel member and the one direction has the following relationship: The optical device according to claim 11, satisfying.
sin ^-1 (1 / (n1)) ≥ tan ^-1 ((1a) / d) A refractive index n1 of the connecting element;
A refractive index n2 of the light guide plate;
In the cross section parallel to both the normal direction to the panel member and the one direction, along the panel surface of the panel member, from one side end of the connection point of the connection element to the light guide plate, A length la to the other side end of the connection portion to the main body, and
The distance d between the main body portion and the light guide plate along the normal direction to the panel member in a cross section parallel to both the normal direction to the panel member and the one direction has the following relationship: The optical device according to claim 11 or 12, wherein the optical device is satisfied.
sin ^-1 (((n2) / (n1)) × sin (cos ^-1 (1 / (n2)))) ≥ tan ^-1 ((1a) / d) A second light source is disposed to face a portion of the side surface of the light guide plate located on the other side in the one direction;
In a cross section parallel to both the normal direction to the panel member and the one direction, the side surface of the connection element located on one side in the one direction is directed from the light guide plate side to the body portion side. The optical device according to any one of claims 11 to 13, which is inclined from the other side to the one side in the one direction. A refractive index n1 of the connecting element;
In the cross section parallel to both the normal direction to the panel member and the one direction, along the panel surface of the panel member, the connection element is connected to the light guide plate from the other side end of the connection element. A length lb to one side end of the connection part to the main body,
The distance d between the main body portion and the light guide plate along the normal direction to the panel member in a cross section parallel to both the normal direction to the panel member and the one direction has the following relationship: The optical device according to claim 14, satisfying.
sin ^-1 (1 / (n1)) ≥ tan ^-1 ((1b) / d) A refractive index n1 of the connecting element;
A refractive index n2 of the light guide plate;
In the cross section parallel to both the normal direction to the panel member and the one direction, along the panel surface of the panel member, the connection element is connected to the light guide plate from the other side end of the connection element. A length lb to one side end of the connection part to the main body,
The distance d between the main body portion and the light guide plate along the normal direction to the panel member in a cross section parallel to both the normal direction to the panel member and the one direction has the following relationship: 16. An optical device according to claim 14 or 15, which satisfies.
sin ^-1 (((n2) / (n1)) × sin (cos ^-1 (1 / (n2)))) ≥ tan ^-1 ((1b) / d)   In the cross-section parallel to both the normal direction to the panel member and the one direction, the connecting element has a wide lower bottom located on the main body side and a narrow upper bottom on the light guide plate side. The optical device according to claim 11, wherein the optical device has an isosceles trapezoidal shape. A refractive index n1 of the connecting element;
A width W1 of the upper base of the isosceles trapezoidal shape in a cross section parallel to both the normal direction to the panel member and the one direction;
A width W2 of the lower base of the isosceles trapezoidal shape in a cross section parallel to both the normal direction to the panel member and the one direction;
The distance between the main body portion and the light guide plate along the normal direction to the panel member in a cross section parallel to both the normal direction to the panel member and the one direction is d. The optical device according to claim 17, wherein:
sin ^-1 (1 / (n1)) ≥ tan ^-1 (((W1) + (W2)) / (2 × d)) A refractive index n1 of the connecting element;
A refractive index n2 of the light guide plate;
A width W1 of the upper base of the isosceles trapezoidal shape in a cross section parallel to both the normal direction to the panel member and the one direction;
A width W2 of the lower base of the isosceles trapezoidal shape in a cross section parallel to both the normal direction to the panel member and the one direction;
The distance between the main body portion and the light guide plate along the normal direction to the panel member in a cross section parallel to both the normal direction to the panel member and the one direction is d. The optical device according to claim 17 or 18, wherein
sin ^-1 (((n2) / (n1)) × sin (cos ^-1 (1 / (n2)))) ≥ tan ^-1 (((W1) + (W2)) / (2 × d))   The optical device according to any one of claims 11 to 19, wherein the plurality of connection elements are arranged in the one direction, and each connection element extends in a direction non-parallel to the one direction.

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