JP2013155097A - Natural lighting panel and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a natural lighting panel which can perform efficient natural lighting, and when applied to a window, enables an outdoor side to be seen from an indoor side.SOLUTION: A natural lighting panel is provided with a plate-like panel with translucency and a laminate stuck to one face side of the panel. The laminate is provided with a plate-like base material layer with translucency, a light diffusion layer formed on the base material layer, and a plate-like protective layer with translucency laminated on a side of the light diffusion layer opposite to the base material layer. The light diffusion layer is provided with light-transmissive parts arranged in parallel with each other in such a way as to enable light transmission and a light diffusion part formed between the light-transmissive parts to diffuse light arrived therein. A face of the light-transmissive part on the base material layer side and the opposed face are parallel to each other.

Description

  The present invention relates to a daylighting panel that is an apparatus for taking outside light such as sunlight into a building or the like, and a method for manufacturing the daylighting panel.

  It is well known that a so-called window glass or the like forms a comfortable space by taking in outside light such as sunlight inside a building or the like. On the other hand, several techniques have been proposed so far in which the direct sunlight is controlled and adopted in a more comfortable manner.

  For example, Patent Document 1 discloses a light control sheet for controlling sunlight intake that is disposed in a light intake unit that incorporates sunlight into a building, and the entire sheet is made of a light-transmitting material that transmits sunlight. The light-transmitting part and a light-shielding part group made of a light-absorbing material that absorbs sunlight, and the light-shielding part group includes a plurality of light-shielding parts made of a light-absorbing material at a predetermined pitch in one direction in the sheet. A light control sheet characterized by being arranged is disclosed.

  Further, Patent Document 2 is a plate-shaped daylighting optical element provided at an opening of a building so as to take in sunlight, and is composed of a large number of prisms arranged on the same plane. The slope of is the angle through which sunlight is transmitted when the elevation angle of the sun is smaller than the critical elevation angle and is totally reflected when the elevation angle is greater than or equal to the critical elevation angle. Discloses an optical element for daylighting that is smaller than the total amount of light collected when the angle is smaller than the critical elevation angle.

JP 2010-259406 A JP 2003-157707 A

  However, in the light control sheet having a configuration as disclosed in Patent Document 1, a part of the outside light (sunlight) is absorbed by the light shielding unit group, and thus the light control sheet is applied to a window of a building or the like. In such a case, it was difficult to efficiently incorporate outside light into the room. Further, the technique disclosed in Patent Document 2 has a problem in durability because prism-like irregularities are exposed to the indoor side. Furthermore, in the technique disclosed in Patent Document 2, it is possible to control light incident from the outside. However, since the image is refracted when viewed from the indoor side, it is clear for viewing the outside scenery. There was a shortage.

  In view of the above-described problems, an object of the present invention is to provide a daylighting panel that can efficiently perform daylighting and can be viewed from the indoor side when it is applied to a window. Moreover, the manufacturing method of the said lighting panel is provided.

  The present invention will be described below. In order to facilitate understanding of the present invention, reference numerals in the accompanying drawings are added in parentheses, but the present invention is not limited to the illustrated embodiment.

  Invention of Claim 1 is equipped with the laminated panel (12a, 12b) bonded by the plate-shaped panel (11) which has translucency, and the one surface side of this panel, This laminated body, A plate-like base material layer (14) having translucency, a light diffusion layer (15a, 15b) formed on the base material layer, and a layer of the light diffusion layer opposite to the base material layer are laminated. A light-transmitting plate-like protective layer (19), and a light diffusing layer formed between the light transmitting portions (16) arranged in parallel so as to transmit light and the light transmitting portions. Light diffusing sections (17a, 17b) for diffusing the light, and the light transmitting section is a daylighting panel (10a, 10b) in which the surface on the base material layer side and the facing surface thereof are parallel.

  The invention described in claim 2 includes a plate-like panel (11) having translucency and a laminated body (12c) bonded to one surface side of the panel, and the laminated body is translucent. Plate-like base material layer (14) and a light diffusion layer (15a) formed on the base material layer, wherein the light diffusion layer is arranged in parallel so that light can be transmitted (16 ) And a light diffusing portion (17a) formed between the light transmitting portions and diffusing the reached light. The light transmitting portion has a surface on the base material layer side and a surface opposite to the surface, which are parallel to each other. A daylighting panel (10c) in which the diffusion layer is sandwiched between the base material layer and the panel.

  According to a third aspect of the present invention, in the daylighting panel (10a, 10b, 10c) according to the first or second aspect, the interface between the light transmission part (16) and the light diffusion part (17a, 17b) is a matte surface. It is characterized by being.

  A fourth aspect of the present invention is the lighting panel (10a, 10b, 10c) according to any one of the first to third aspects, wherein the laminate (12a, 12b, 12c) is provided with the panel (11). A hard coat layer (20) is provided on the opposite side of the surface.

  The invention according to claim 5 is the daylighting panel (10a, 10b, 10c) according to any one of claims 1 to 4, wherein the laminate (12a, 12b, 12c) is an ultraviolet absorber, a heat ray absorber, Alternatively, a layer containing at least one of the near infrared absorbers is provided.

  Invention of Claim 6 is a manufacturing method of the lighting panel (10a, 10b) of Claim 1, Comprising: The other of the base material layer (14) by which the contact bonding layer (13) was laminated | stacked on one surface A step of forming a light diffusing layer (15a, 15b) on the surface, a step of laminating a protective layer (19) on the opposite side of the base layer of the light diffusing layer, and a laminate through an adhesive layer (13) And a step of bonding (12a, 12b) to the panel (11).

  Invention of Claim 7 is a manufacturing method of the lighting panel (10c) of Claim 2, Comprising: The process of forming a light-diffusion layer (15a) in one surface of a base material layer (14), A daylighting panel including a step of laminating the adhesive layer (21) on the side opposite to the base material layer of the light diffusion layer and a step of laminating the laminate (12c) to the panel (11) via the adhesive layer. It is a manufacturing method.

  ADVANTAGE OF THE INVENTION According to this invention, when it applies to a window efficiently when it applies to a window, the manufacturing method of this lighting panel which can see the outdoor side from the indoor side can be provided.

It is a front view of the window 1 to which the lighting panel 10a concerning 1st embodiment was applied. It is the figure which showed the cross section of the lighting panel 10a concerning 1st embodiment, and represented the layer structure typically. It is the figure which showed the cross section of the lighting panel 10b concerning 2nd embodiment, and represented the layer structure typically. It is the figure which showed the cross section of the lighting panel 10c concerning 3rd embodiment, and represented the layer structure typically.

  The above-described operation and gain of the present invention will be clarified from embodiments for carrying out the invention described below. Hereinafter, the present invention will be described based on embodiments shown in the drawings. However, the present invention is not limited to the embodiment.

  FIG. 1 is a front view of a window 1 to which a daylighting panel 10a according to the first embodiment is applied. Thus, the window 1 is formed by attaching the frame 2 to the outer peripheral part of the daylighting panel 10a. And the said window 1 is arrange | positioned at the opening part of a building.

  FIG. 2 is a diagram schematically showing a layer structure of a section of the daylighting panel 10a in the sectional view in the vertical direction indicated by II-II in FIG. In FIG. 2, for ease of viewing, some of the repeated symbols are omitted (the same applies to the following drawings).

  The daylighting panel 10 a includes a panel 11 and a laminated body 12 a bonded to the panel 11. The laminate 12a includes an adhesive layer 13, a base material layer 14, a light diffusion layer 15a, an adhesive layer 18, a protective layer 19, and a hard coat layer 20. Hereinafter, these components constituting the daylighting panel 10a will be described. In FIG. 2, the lighting panel 10a is shown in a posture attached to a building or the like so that the left side of FIG. 2 is the outdoor side, the right side is the indoor side, the upper side is the top, and the lower side is the top side. Become the ground.

  The panel 11 is a translucent plate-like translucent panel used for a normal building or vehicle window, such as a window glass or a resin panel. Therefore, a known plate glass or resin panel can be used as a member constituting the panel 11.

  The adhesive layer 13 is a layer for adhering the panel 11 and the laminated body 12a. The material constituting the adhesive layer 13 is not particularly limited as long as it can adhere the panel 11 and the laminate 12a, and a known pressure-sensitive adhesive, adhesive, photocurable resin, thermosetting resin, or the like is used. Can do. As a material constituting the adhesive layer 13, for example, an acrylic adhesive can be used, and more specifically, an adhesive obtained by combining an acrylic copolymer and an isocyanate compound can be used. However, the material constituting the adhesive layer 13 is preferably made of a material excellent in translucency and weather resistance due to the properties of the daylighting panel 10a.

  Although the thickness of the contact bonding layer 13 is not specifically limited, It is preferable that they are 10 micrometers or more and 100 micrometers or less. If the adhesive layer 13 is too thin, the adhesion between the panel 11 and the laminate 12a may be reduced. If the adhesive layer 13 is too thick, it is difficult to make the thickness of the adhesive layer 13 uniform.

  The base material layer 14 is a layer serving as a base material for forming the light diffusion layer 15a, and has a light transmitting property and supports the light diffusion layer 15a so that deformation of the light diffusion layer 15a can be prevented. From this point of view, as specific examples of the material constituting the base material layer 14, for example, a transparent resin mainly composed of one or more of acrylic, styrene, polycarbonate, polyethylene terephthalate, acrylonitrile, and the like, epoxy acrylate and urethane acrylate The reactive resin (ionizing radiation curable resin etc.) can be mentioned.

  Although the thickness of the base material layer 14 is not specifically limited, It is preferable that they are 25 micrometers or more and 300 micrometers or less. If the thickness of the base material layer 14 is out of this range, there is a risk of causing problems in workability. For example, if the base material layer 14 is too thin, wrinkles are likely to occur. Moreover, if the base material layer 14 is too thick, it will become difficult to wind in an intermediate process.

  The light diffusion layer 15a is a layer capable of diffusing light incident from one surface side (particularly light incident from above as described later) and emitting it to the other surface side. The light diffusion layer 15a has a cross section shown in FIG. 2 and has a shape extending to the back / front side of the paper. That is, the light transmission part 16 which is trapezoid in the cross section shown in FIG. 2, and the light diffusion part 17a in which the cross section formed between the light transmission parts 16 is formed in the trapezoidal recess is provided.

  The light transmitting portion 16 is a portion that transmits light, and the surface of the light transmitting portion 16 on the base material layer 14 side and the opposing surface (surface on the protective layer 6 side) are formed in parallel. Since the surface on the base material layer 14 side of the light transmitting portion 16 and the facing surface thereof are formed in parallel, when the daylighting panel 10a is applied to a window as will be described later, the scenery from the indoor side to the outdoor side can be seen. It becomes easy to see.

The material constituting the light transmission part 16 may be the same as or different from that of the base material layer 14. However, if there is a difference in refractive index between the two, the possibility of light being deflected at the interface increases, so even if they are the same material or different materials, the refractive index difference is small or there is no refractive index difference. It is preferable.
When the light transmission part 16 and the base material layer 14 are comprised with the same material, the base material layer 14 and the light transmission part 16 can also be formed integrally. Further, even when the light transmission part 16 and the base material layer 14 are made of different materials, and even when they are made of the same material, the base material layer 14 and the light transmission part 16 are separately formed, and known means May be laminated.
A specific example of a method for forming the light transmission portion 16 will be described later.

  Examples of the material constituting the light transmitting portion 16 include transparent resins mainly composed of one or more of acrylic, styrene, polycarbonate, polyethylene terephthalate, acrylonitrile, etc., and epoxy acrylate and urethane acrylate reactive resins (ionizing radiation curing). Mold resin).

  The light transmission parts 16 are arranged in parallel in the direction along the sheet surface at a predetermined interval. Accordingly, a concave portion having a trapezoidal cross section is formed between the light transmitting portions 16. The concave portion is a groove having a trapezoidal cross section having a lower base on the upper base side of the light transmitting portion 16 and an upper base on the lower base side of the light transmitting portion 16. Is filled with the light diffusing portion 17a. That is, in the cross section shown in FIG. 2, the light transmitting portion 16 has a trapezoidal cross section having a lower base on the surface on the base material layer 14 side and an upper base shorter than the lower base on the opposite surface. It is an element having The angle θ1 of the hypotenuse composing the trapezoidal cross section of the light diffusion portion 17a is preferably 0 ° or more and 20 ° or less. If the light diffusion portion 17a is formed so that θ1 is less than 0 ° (in the cross section shown in FIG. 2, the width on the adhesive layer 18 side is shorter than the width on the base material layer 14 side of the light diffusion portion 17a), As described later, it becomes difficult to manufacture a mold used when forming the light diffusion layer 15a, and the mold releasability of the mold used when forming the light diffusion layer 15a as described later is deteriorated. . On the other hand, if θ1 is too large, the aspect ratio of the height (the length of the light diffusion layer 15a in the thickness direction) to the opening width (the width of the light diffusion portion 17a on the adhesive layer 18 side in the cross section shown in FIG. 2) is increased. It becomes difficult to obtain the desired effect described later by the light diffusion layer 15a.

  However, in the present invention, the shapes of the light transmission part and the light diffusion part are not limited to the form illustrated in FIG. The light transmission part should just be formed in parallel with the surface by the side of a base material layer, and its opposing surface. Therefore, in the cross section corresponding to the cross section shown in FIG. 2, the light transmitting portion may be rectangular, and the portion corresponding to the hypotenuse of the trapezoid is curved (the tangent of the curve is the same condition as θ1 in each portion) It is preferable that it is in the form of a broken line or a broken line (each line constituting the broken line preferably has the same condition as θ1).

  The pitch at which the light diffusion portions 17a are arranged in parallel is not particularly limited, but is preferably 10 μm or more and 200 μm or less. If the pitch of the light diffusion portions 17a is too narrow, it is difficult to obtain a desired effect described later by the light diffusion layer 15a. If the pitch of the light diffusing parts 17a is too narrow, it becomes difficult to form the light diffusing parts 17a, or the mold releasability becomes worse when the light diffusing layer 15a is produced as described later. There is a risk that processability will deteriorate. Further, the opening width of the light diffusion portion 17a (the width on the adhesive layer 18 side in the cross section shown in FIG. 2) is not particularly limited, but is preferably 5 μm or more and 150 μm or less. If the opening width of the light diffusion portion 17a is too narrow, it is difficult to obtain a desired effect described later by the light diffusion layer 15a. If the opening width of the light diffusing portion 17a is too narrow, it becomes difficult to form the light diffusing portion 17a, or the mold releasability is poor when the light diffusing layer 15a is produced as described later. Or processability may be deteriorated.

  The light diffusing unit 17a is configured to diffusely reflect the reached light. Such a light diffusion portion 17a can be formed by filling the concave portions between the light transmission portions 16 with, for example, the following materials. As a material constituting the light diffusion portion 17a, a material having a concealing property is preferable. Examples of such a material include a white pigment and a silver pigment. Examples of the white pigment include metal oxides such as titanium oxide, titanium dioxide, magnesium oxide, and zinc oxide. As a silver pigment, metals, such as aluminum and chromium, are mentioned, for example.

  Further, from the viewpoint of facilitating diffuse reflection of light at the interface between the light diffusion portion 17a and the light transmission portion 16, the interface between the light transmission portion 16 and the light diffusion portion 17a may be a matte surface.

  The thickness of the light diffusion layer 15a is not particularly limited, but is preferably 10 μm or more and 200 μm or less. If the light diffusion layer 15a is too thin, it may be difficult to obtain a desired effect, which will be described later, or it may be difficult to perform fine processing (formation of the light diffusion portion 17a, etc.). On the other hand, if the light diffusion layer 15a is too thick, the processability may be deteriorated, for example, when the light diffusion layer 15a is produced as described later, it becomes difficult to release the mold.

  The adhesive layer 18 is a layer for attaching the protective layer 19 to the side opposite to the base material layer 14 of the light diffusion layer 15a, and various types having such a function can be used. The material used for the adhesive layer 18 is not particularly limited, and known pressure-sensitive adhesives, adhesives, ultraviolet curable resins, ionizing radiation curable resins, photocurable resins, thermosetting resins, and the like can be used. For example, an acrylic pressure-sensitive adhesive can be used, and more specifically, a pressure-sensitive adhesive obtained by combining an acrylic copolymer and an isocyanate compound can be used. However, due to the nature of the daylighting panel 10a, it is preferable to use a material having excellent translucency and weather resistance.

  Although the thickness of the contact bonding layer 18 is not specifically limited, It is preferable that they are 10 micrometers or more and 100 micrometers or less. If the adhesive layer 18 is too thin, the adhesion between the protective layer 19 and the light diffusion layer 15a may be reduced. If the adhesive layer 18 is too thick, it is difficult to make the thickness of the adhesive layer 18 uniform.

  The protective layer 19 is a layer that is paired with the base material layer 14 and is disposed so as to sandwich the light diffusion layer 15 a, and has a function of protecting the light diffusion layer 15 a together with the base material layer 14. If the protective layer 19 has such a function, the material will not be specifically limited, For example, it can comprise with the material similar to the above-mentioned base material layer 14. FIG.

The hard coat layer 20 is a layer provided on the outermost surface of the daylighting panel 10a opposite to the panel 11 for the purpose of surface protection. The hard coat layer 20 can be formed as a transparent resin layer, and is preferably formed as a cured resin layer obtained by curing a curable resin from the viewpoint of resistance to scratches and surface contamination.
Specifically, an ionizing radiation curable resin, other known curable resins, or the like may be appropriately employed according to the required performance. Examples of the ionizing radiation curable resin include acrylate-based, oxetane-based, and silicone-based resins. For example, acrylate-based ionizing radiation curable resins include monofunctional (meth) acrylate monomers, bifunctional (meth) acrylate monomer monomers, (meth) acrylate monomers such as trifunctional or higher (meth) acrylate monomers, urethane ( It consists of (meth) acrylate ester oligomers such as (meth) acrylate, epoxy (meth) acrylate, and polyester (meth) acrylate, or (meth) acrylate prepolymers. Examples of tri- or higher functional (meth) acrylate monomers include trimethylolpropane tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol hexa (meth) acrylate, and the like.

  Further, the hard coat layer 20 may be added with a function of improving the stain resistance. This can be achieved, for example, by adding a silicone compound, a fluorine compound, or the like. Further, as other functions, it may have a function of improving antistatic properties and water repellency. As materials that can be used for improving the antistatic property, PEDOT-PSS (PEDOT (Poly (3,4-ethylenedioxythiophene); 3,4-ethylenedioxythiophene polymer) and PSS (polynesulfonate) are used for the electron conduction type. ); Styrene sulfonic acid polymer)), and lithium ion-based materials are included in the ion conductive type. Examples of materials that can be used for improving water repellency include fluorine compounds.

  The daylighting panel 10a described above can be manufactured, for example, as follows.

  The daylighting panel 10a can be manufactured by bonding the laminate 12a to the panel 11. The laminated body 12a can be produced, for example, as follows.

  First, the light diffusion layer 15a can be formed by a method using a mold roll. That is, a mold roll is prepared in which unevenness capable of transferring the light transmitting portion 16 of the light diffusion layer 15a is provided on the outer peripheral surface of the cylindrical roll. And the base material used as the base material layer 14 is inserted between a die roll and the nip roll arrange | positioned so as to oppose this. At this time, it is preferable that the adhesive layer 13 is formed in advance on one surface of the substrate. And a mold roll and a nip roll are rotated, supplying the composition which comprises the light transmissive part 16 between the surface by which the contact bonding layer 13 is not arrange | positioned among base materials, and a mold roll. As a result, the concave / convex concave portions formed on the surface of the mold roll are filled with the composition constituting the light transmitting portion 16, and the composition conforms to the concave / convex surface shape of the mold roll.

  Here, as a composition which comprises the light transmissive part 16, what was mentioned above is preferable, but it is as follows more specifically. That is, the photocurable resin composition which mix | blended the reactive dilution monomer (M1) and the photoinitiator (I1) with the photocurable prepolymer (P1) can be used.

  Examples of the photocurable prepolymer (P1) include epoxy acrylate-based, urethane acrylate-based, polyether acrylate-based, polyester acrylate-based, and polythiol-based prepolymers.

  Examples of the reactive dilution monomer (M1) include vinyl pyrrolidone, 2-ethylhexyl acrylate, β-hydroxy acrylate, and tetrahydrofurfuryl acrylate.

  Examples of the photopolymerization initiator (I1) include hydroxybenzoyl compounds (2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, benzoin alkyl ether, etc.), benzoyl Formate compounds (such as methylbenzoylformate), thioxanthone compounds (such as isopropylthioxanthone), benzophenones (such as benzophenone), phosphate compounds (1,3,5-trimethylbenzoyldiphenylphosphine oxide, bis (2,4,6-) Trimethylbenzoyl) -phenylphosphine oxide and the like, and benzyldimethyl ketal and the like. Among these, the irradiation device for curing the photocurable resin composition and the curability of the photocurable resin composition can be arbitrarily selected. From the viewpoint of preventing the light transmitting portion 16 from being colored, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone and bis (2,4,6-trimethylbenzoyl) are preferable. ) -Phenylphosphine oxide.

  These photocurable prepolymer (P1), reactive diluent monomer (M1) and photopolymerization initiator (I1) can be used alone or in combination of two or more.

  Light is irradiated from the base material side by a light irradiation device to the composition constituting the light transmission portion 16 sandwiched between the mold roll and the base material and filled therein. Thereby, the composition which comprises the light transmissive part 16 can be hardened, and the shape can be fixed. And the base material layer 14 and the shape | molded light transmission part 16 are released from a metal mold | die roll with a mold release roll.

  Next, the light diffusing portion 17a can be formed by filling the concave portion of the light transmitting portion 16 with the composition constituting the light diffusing portion 17a and curing it. In this way, the light diffusion layer 15a can be formed on the base material layer.

  On the other hand, a laminate in which the hard coat layer 20 is laminated on one surface of the protective layer 19 and the adhesive layer 18 is laminated on the other surface is laminated so that the adhesive layer 18 of this laminate is in contact with the light diffusion layer 15a. In addition, what is necessary is just to irradiate an ultraviolet-ray or light after a lamination | stacking and to harden | cure, when the contact bonding layer 18 consists of ultraviolet curing resin, photocurable resin, etc.

  The daylighting panel 10a can be manufactured by bonding the laminate produced as described above to the panel 11 with the adhesive layer 13.

  The daylighting panel 10a may include a configuration for adding another function to any one of the above-described layers. For example, an ultraviolet absorber, a heat ray absorber, or a near infrared absorber may be added to provide an ultraviolet ray absorbing function, a heat ray absorbing function, or a near infrared ray absorbing function.

  The near-infrared absorbing function can be improved by adding or applying a near-infrared absorbing agent (near-infrared absorbing dye) to one or more of the above layers. As the near-infrared absorbing dye, it is preferable to use one that absorbs a wavelength region of 800 nm to 1100 nm. The near-infrared transmittance in the wavelength region is preferably 20% or less, and more preferably 10% or less. On the other hand, the near-infrared absorbing dye preferably has a sufficient transmittance in the visible light region, that is, in the wavelength region of 380 nm to 780 nm.

  The ultraviolet absorbing function can be improved by adding or applying an ultraviolet absorber exemplified below to one or more of the above layers. Examples of ultraviolet absorbers include benzotriazole ultraviolet absorbers (TINUVIN P, TINUVIN P FL, TINUVIN 234, TINUVIN 326, TINUVIN 326 FL, TINUVIN 328, TINUVIN 329, TINUVIN 329 FL, all manufactured by BASF Japan Ltd.), and triazine. Ultraviolet absorber (TINUVIN 1577 ED, manufactured by BASF Japan Ltd.), benzophenone ultraviolet absorber (CHIMASSORB 81, CHIMASORB 81 FL, all manufactured by BASF Japan Ltd.), benzoate ultraviolet absorber (TINUVIN 120, BASF Japan Ltd.) Manufactured).

  The heat ray absorbing function can be improved by adding or applying a heat ray absorbent exemplified below to one or more of the above-described layers. Examples of the heat ray absorbent include metal oxide ultrafine particles such as antimony-doped tin oxide (ATO) or tin-doped indium oxide (ITO) and phthalocyanine compounds.

  Next, main optical paths in a scene where the window 1 is formed by the daylighting panel 10a and disposed in the opening of the building will be described. FIG. 2 shows a schematic optical path example. Note that the optical path example is conceptually shown, and does not strictly represent the degree of refraction or reflection.

  External light L1 applied to the daylighting panel 10a from obliquely above where sunlight is assumed passes through the panel 11, the adhesive layer 13 and the base material layer 14, and reaches the light diffusion portion 17a of the light diffusion layer 15a. The external light L1 that has reached the light diffusion portion 17a is diffusely reflected by the light diffusion portion 17a. The diffusely reflected light passes through the adhesive layer 18, the protective layer 19, and the hard coat layer 20 and enters the indoor side. At this time, since the light incident on the indoor side is diffused, it is possible to prevent direct exposure of outside light, and it is possible to illuminate a wide range of the indoor space with outside light.

  Thus, according to the lighting panel 10a, since it can be taken in indoors, without absorbing external light actively, light can be taken in efficiently.

  On the other hand, when the outside is viewed from the indoor side, the observer's line of sight is based on the light L2. That is, the outdoor can be observed through the surface on the base material layer 14 side of the light transmitting portion 16 which is a surface parallel to the panel 11 and the surface facing the surface. Since there is no large refraction at the interface in this part, it is possible to see the outdoor scene clearly.

  As described above, according to the daylighting panel 10a, it is possible to view the outside scenery from the indoor side relatively clearly while taking in the outside light efficiently. Moreover, since the light-diffusion layer 15a is pinched | interposed by the base material layer 14 and the protective layer 19, durability can also be improved.

  FIG. 3 is a view for explaining the daylighting panel 10b according to the second embodiment, and is a view corresponding to FIG. 2 of the daylighting panel 10b. In FIG. 3, the same components as those in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted.

  The daylighting panel 10 b includes a panel 11 and a laminated body 12 b bonded to the panel 11. The laminate 12b includes an adhesive layer 13, a base material layer 14, a light diffusion layer 15b, an adhesive layer 18, a protective layer 19, and a hard coat layer 20. The daylighting panel 10b is different from the daylighting panel 10a in that a light diffusion layer 15b is applied instead of the light diffusion layer 15a of the daylighting panel 10a. About the other point, the lighting panel 10b and the lighting panel 10a are the same.

  The light diffusion portion 17a of the light diffusion layer 15a provided in the daylighting panel 10a diffuses and reflects light, whereas the light diffusion portion 17b of the light diffusion layer 15b provided in the daylighting panel 10b diffuses while transmitting light. Therefore, the daylighting panel 10b is different from the daylighting panel 10a. The light diffusing portion 17b is formed in the recess between the light transmitting portions 16 in the same manner as the light diffusing portion 17a. As a material constituting the light diffusion portion 17b that diffuses the transmitted light while transmitting, a material obtained by mixing a transparent binder resin and a transparent diffusing agent having a different refractive index from the binder resin is preferable. Examples of the diffusing agent include crosslinked particles obtained by polymerizing monomers mainly composed of (meth) acrylic acid ester and styrene. Specific examples of the cross-linked particles include Gantz Pearl manufactured by Gantz Kasei Co., Ltd. The cross-linked particles can be controlled in refractive index by changing the mixing ratio of acrylic acid ester and styrene. For example, the refractive index can be made about 1.49 by increasing the acrylic ratio, and the refractive index can be made about 1.59 by increasing the styrene ratio. Also, urethane cross-linked particles can be used as the diffusing agent. Specific examples of the urethane crosslinked particles include Art Pearl manufactured by Negami Kogyo Co., Ltd. The diffusing agent can also be made into hollow particles.

  Next, main light paths in a scene in which a window is formed by the daylighting panel 10b and arranged in an opening of a building will be described. FIG. 3 shows a schematic optical path example. Note that the optical path example is conceptually shown, and does not strictly represent the degree of refraction or reflection.

  External light L3 irradiated to the daylighting panel 10b from an obliquely upper side where sunlight is assumed passes through the panel 11, the adhesive layer 13, and the base material layer 14, and reaches the light diffusion portion 17b of the light diffusion layer 15b. The external light L3 that has reached the light diffusion portion 17b enters the light diffusion layer 15b and diffuses while passing through the light diffusion layer 15b. The light transmitted through the light diffusion layer 15b in this way then passes through the adhesive layer 18, the protective layer 19, and the hard coat layer 20, and enters the indoor side. At this time, since the light incident on the indoor side is diffused, it is possible to prevent direct exposure of outside light, and it is possible to illuminate a wide range of the indoor space with outside light.

  Thus, according to the lighting panel 10b, since it can be taken in indoors, without absorbing external light actively, light can be taken in efficiently.

  On the other hand, when the outside is viewed from the indoor side, the observer's line of sight is the same as that of the daylighting panel 10a, and the outdoor scene can be seen relatively clearly.

  As described above, according to the daylighting panel 10b, it is possible to view the outside scenery relatively clearly from the indoor side while taking in the outside light efficiently. Moreover, since the light-diffusion layer 15b is pinched | interposed by the base material layer 14 and the protective layer 19, durability can also be improved.

  FIG. 4 is a view for explaining a daylighting panel 10c according to the third embodiment, and is a view corresponding to FIG. 2 of the daylighting panel 10c. 4, the same components as those in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted.

  The daylighting panel 10 c includes a panel 11 and a laminated body 12 c bonded to the panel 11. The laminate 12 c includes an adhesive layer 21, a light diffusion layer 15 a, a base material layer 14, and a hard coat layer 20.

  The adhesive layer 21 is a layer for attaching the light diffusion layer 15a to the panel 11, and various types having such a function can be used. The material used for the adhesive layer 21 is not particularly limited, and known pressure-sensitive adhesives, adhesives, ultraviolet curable resins, ionizing radiation curable resins, photocurable resins, thermosetting resins, and the like can be used. For example, an acrylic pressure-sensitive adhesive can be used, and more specifically, a pressure-sensitive adhesive obtained by combining an acrylic copolymer and an isocyanate compound can be used. However, due to the nature of the daylighting panel 10c, it is preferable to use a material having excellent translucency and weather resistance.

  In the above-described daylighting panels 10a and 10b, the light diffusion layer 10a is sandwiched between the base material layer 14 and the protective layer 19, but in the daylighting panel 10c, the light diffusion layer 10a is sandwiched between the panel 11 and the base material layer 14. It is out. Even if it is this form, durability can be improved similarly to the lighting panels 10a and 10b. Moreover, according to the lighting panel 10c, since a layer structure can be simplified compared with the lighting panels 10a and 10b, it can manufacture at low cost.

  In such a daylighting panel 10c as well as the daylighting panel 10a, it is possible to efficiently take in light, so that the scenery outside the room can be clearly seen when looking outside from the room side. In addition, although the form with which the light-diffusion layer 15a is provided is illustrated in FIG. 4, even if it replaces this with the light-diffusion layer 15b, there can exist the above-mentioned effect.

  The daylighting panel 10c described above can be manufactured, for example, as follows.

  The light diffusion layer 15a can be formed by a method using a mold roll. That is, a mold roll is prepared in which unevenness capable of transferring the light transmitting portion 16 of the light diffusion layer 15a is provided on the outer peripheral surface of the cylindrical roll. And the base material used as the base material layer 14 is inserted between a die roll and the nip roll arrange | positioned so as to oppose this. At this time, it is preferable that the hard coat layer 20 is formed in advance on one surface of the substrate. And a mold roll and a nip roll are rotated, supplying the composition which comprises the light transmissive part 16 between the surface by which the hard-coat layer 20 is not arrange | positioned among base materials, and a mold roll. As a result, the concave / convex concave portions formed on the surface of the mold roll are filled with the composition constituting the light transmitting portion 16, and the composition conforms to the concave / convex surface shape of the mold roll. Here, the composition which comprises the light transmissive part 16 is the same as that of what was demonstrated with the manufacturing method of the lighting panel 10a.

  Light is irradiated from the base material side by a light irradiation device to the composition constituting the light transmission portion 16 sandwiched between the mold roll and the base material and filled therein. Thereby, the composition which comprises the light transmissive part 16 can be hardened, and the shape can be fixed. And the base material layer 14 and the shape | molded light transmission part 16 are released from a metal mold | die roll with a mold release roll.

  Next, the light diffusing portion 17a can be formed by filling the concave portion of the light transmitting portion 16 with the composition constituting the light diffusing portion 17a and curing it. In this way, the light diffusion layer 15a can be formed on the base material layer. Thereafter, the adhesive layer 21 is laminated on the side of the light diffusion layer 15 a opposite to the base material layer 14.

  The lighting panel 10c can be manufactured by bonding the laminate produced as described above to the panel 11 with the adhesive layer 21.

DESCRIPTION OF SYMBOLS 1 Window 2 Frame 10a, 10b, 10c Daylighting panel 11 Panel 12a, 12b, 12c Laminated body 13 Adhesion layer 14 Base material layer 15a, 15b Light diffusion layer 16 Light transmission part 17a, 17b Light diffusion part 18 Adhesion layer 19 Protection layer 20 Hard coat layer

Claims (7)

A plate-like panel having translucency and a laminate bonded to one surface side of the panel;
The laminate has a light-transmitting plate-like base material layer, a light diffusion layer formed on the base material layer, and a light transmission layer laminated on the opposite side of the light diffusion layer from the base material layer. A plate-like protective layer having optical properties,
The light diffusion layer includes a light transmission part arranged in parallel so as to transmit light, and a light diffusion part formed between the light transmission parts and diffusing the reached light,
The light transmission part is a daylighting panel in which a surface on the substrate layer side and a surface facing the same are parallel to each other. A plate-like panel having translucency and a laminate bonded to one surface side of the panel;
The laminate includes a plate-like base material layer having translucency and a light diffusion layer formed on the base material layer,
The light diffusion layer includes a light transmission part arranged in parallel so as to transmit light, and a light diffusion part formed between the light transmission parts and diffusing the reached light,
The light transmission part, the surface on the base material layer side and the facing surface thereof are parallel,
The daylighting panel, wherein the light diffusion layer is sandwiched between the base material layer and the panel.   The daylighting panel according to claim 1 or 2 whose interface with said light diffusion part of said light penetration part is a mat face.   The daylighting panel according to any one of claims 1 to 3, wherein the laminate includes a hard coat layer on a surface opposite to a side on which the panel is provided.   The daylighting panel according to any one of claims 1 to 4, wherein the laminate includes a layer containing at least one of an ultraviolet absorber, a heat ray absorber, and a near infrared absorber. It is a manufacturing method of the lighting panel of Claim 1, Comprising:
Forming the light diffusion layer on the other surface of the base material layer, the adhesive layer being laminated on one surface;
Laminating the protective layer on the side of the light diffusion layer opposite to the base material layer;
Bonding the laminate to the panel via the adhesive layer;
A method for manufacturing a daylighting panel. It is a manufacturing method of the lighting panel of Claim 2, Comprising:
Forming the light diffusion layer on one surface of the base material layer;
Laminating an adhesive layer on the opposite side of the light diffusion layer from the base material layer;
Bonding the laminate to the panel via the adhesive layer;
A method for manufacturing a daylighting panel.

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