JP6669218B2 - Light control unit and light control unit with transparent plate - Google Patents

Description

  The present invention relates to a light control unit including a light control sheet having a variable light transmittance.

  The light control sheet includes a light control layer containing a liquid crystal composition, and a pair of transparent electrode layers sandwiching the light control layer. When the alignment state of the liquid crystal molecules changes according to the potential difference between the pair of transparent electrode layers, the light transmittance of the light control sheet changes. The light control sheet is attached to, for example, a window glass of a building, a vehicle, or the like (for example, see Patent Document 1).

JP 2018-40883 A

  For example, when the light control sheet is disposed at the boundary between the outdoor and indoor areas or at the boundary between two spaces having a large temperature difference, moisture caused by rainwater, dew condensation, or the like may adhere to the light control sheet. obtain. When moisture enters the inside of the light control layer, the variable function of the light transmittance of the light control sheet is reduced.

  An object of the present invention is to provide a light control unit that can enhance the waterproofness of a light control sheet.

  A light control unit that solves the above-mentioned problem includes a light control layer including a liquid crystal composition, a light control sheet including a pair of transparent electrode layers sandwiching the light control layer, and a support having a larger outer shape than the light control sheet. And a base material. Further, the light control unit includes a covering portion that extends along an outer edge of the light control sheet on the support base material and covers an end surface of the light control sheet. The light control sheet is attached to the support base in a state where the light control sheet is located inside the support base in a plan view facing the surface of the light control sheet.

  According to the configuration, one surface of the light control sheet is covered with the supporting base material, and the end surface of the light control sheet is covered with the waterproof portion. Therefore, it is possible to prevent moisture from entering the inside of the light control sheet. Therefore, the waterproofness of the light control sheet can be improved.

In the above configuration, the covering portion may be made of a waterproof tape.
In the above configuration, the coating portion may be made of an EVA-based or EMMA-based hot melt adhesive.

In the above configuration, the covering section may be formed of a thermocompression bonding sheet.
According to each of the above configurations, good waterproofness can be obtained for the covering portion.

In the above configuration, the support substrate may be a polyethylene terephthalate film.
According to the above configuration, the support base material is made of a highly versatile material. In addition, since EVA-based and EMMA-based materials have high adhesiveness to the polyethylene terephthalate film, when the waterproof portion is formed from these materials, the waterproofness of the light control sheet is further enhanced.

In the above configuration, the covering portion may be a first covering portion, and the light control unit may further include a second covering portion extending from the first covering portion along a surface of the support base.
According to the above configuration, since the covering portion also covers the surface of the supporting base material near the end face of the light control sheet, it is possible to further suppress moisture from entering the inside of the light control sheet from the end face.

In the above configuration, the covering portion may be a first covering portion, and the light control unit may further include a third covering portion extending along the surface of the light controlling sheet from the first covering portion.
According to the above configuration, since the covering portion also covers the surface of the light control sheet near the end face of the light control sheet, it is possible to further suppress the entry of moisture from the end face into the inside of the light control sheet.

  In the above configuration, the light control sheet has a wiring region to which a wiring unit for connecting the transparent electrode layer and a power supply is connected, and the light control unit is configured to support the light control sheet with respect to the light control sheet. A wiring waterproof part covering the wiring area from the side opposite to the material may be provided.

According to the above configuration, it is possible to prevent moisture from entering the light control sheet from the vicinity of the wiring region. Therefore, the waterproofness of the light control sheet can be improved.
In the above configuration, the light control unit may further include a transparent adhesive layer located on a surface of the support base opposite to a surface on which the light control sheet is attached.

  According to the above configuration, the light control unit can be mounted on the mounting target by attaching the transparent adhesive layer to the mounting target of the light control sheet. Therefore, the light control sheet can be attached to the mounting object in a form in which waterproof measures are taken as the light control unit, so that the light control sheet can be easily installed.

  ADVANTAGE OF THE INVENTION According to this invention, the waterproofness of a light control sheet can be improved.

The figure which shows the planar structure of a light control unit about one Embodiment of a light control unit. FIG. 2 is a diagram showing a cross-sectional structure along the line II-II in FIG. 1. The figure which shows the light control unit of one Embodiment stuck on the transparent plate. The figure which shows the cross-section of the end surface waterproof part of the 1st form in the light control unit of one Embodiment. The figure which shows the cross-section of the end surface waterproof part of the 2nd form in the light control unit of one Embodiment. The figure which shows the cross-section of the end surface waterproof part of the 3rd form in the light control unit of one Embodiment. The figure which shows the cross-section of the end surface waterproof part of the 4th form in the light control unit of one Embodiment. The figure which shows the planar structure near the wiring part in the light control unit of one Embodiment. FIG. 9A is a diagram showing a cross-sectional structure along the line IXa-IXa in FIG. 8, and FIG. 9B is a diagram showing a cross-sectional structure along a line IXb-IXb in FIG. The figure which shows the other example of the planar structure near the wiring part in the light control unit of one Embodiment. 10A is a diagram illustrating a cross-sectional structure along the line XIa-XIa in FIG. 10, and FIG. 11B is a diagram illustrating a cross-sectional structure along the line XIb-XIb in FIG.

One embodiment of the light control unit will be described with reference to FIGS.
[Overall configuration of dimming unit]
As shown in FIG. 1, the light control unit 10 includes a light control sheet 20, a wiring section 30, a support base material 40, and a waterproof section 50.

  The light control sheet 20 is attached to the support base material 40. In a plan view seen from a position facing the front surface 20F of the light control sheet 20, the outer shape of the support substrate 40 is larger than the outer shape of the light control sheet 20. In other words, in the plan view, all the outer edges of the light control sheet 20 are located inside the outer edges of the support base material 40. That is, the light control sheet 20 is attached to the surface of the support base 40 in a state where the light control sheet 20 is located only on the support base 40. The outer shapes of the light control sheet 20 and the support substrate 40 are not particularly limited. FIG. 1 shows an example in which both the outer shape of the light control sheet 20 and the outer shape of the support base material 40 are rectangular.

  The wiring section 30 is a section for connecting a pair of transparent electrode layers included in the light control sheet 20 to a power supply. The wiring section 30 includes a first wiring section 30A for connecting one of the pair of transparent electrode layers and a power supply, and a second wiring section 30B for connecting the other of the pair of transparent electrode layers and a power supply. including. The wiring section 30 is connected to the light control sheet 20 at an end of the light control sheet 20, extends outside the light control sheet 20, and further extends outside the support base material 40.

  Although FIG. 1 illustrates an example in which the first wiring portion 30A and the second wiring portion 30B are arranged along one side of the light control sheet 20, the first wiring portion 30A and the second wiring portion 30B are not aligned. The arrangement is not particularly limited.

  In a plan view as viewed from a position facing the front surface 20F of the light control sheet 20, the waterproof portion 50 surrounds the entire circumference of the light control sheet 20. The waterproof section 50 includes an end face waterproof section 51 for preventing ingress of moisture from the end face of the light control sheet 20 and a wiring waterproof section 52 for preventing moisture from entering near the wiring section 30. The end face waterproofing portion 51 extends along the outer edge of the light control sheet 20 on the support base material 40 and covers the end face of the light control sheet 20. The wiring waterproof part 52 includes a first wiring waterproof part 52A that covers the first wiring part 30A and a second wiring waterproof part 52B that covers the second wiring part 30B.

  As shown in FIG. 2, the light control sheet 20 includes a light control layer 21, a first transparent electrode layer 22A and a second transparent electrode layer 22B, which are a pair of transparent electrode layers, and a first transparent electrode layer, which is a pair of transparent support layers. It has a transparent support layer 23A and a second transparent support layer 23B. The first transparent electrode layer 22A and the second transparent electrode layer 22B sandwich the light control layer 21, and the first transparent support layer 23A and the second transparent support layer 23B are connected to the light control layer 21 and the transparent electrode layers 22A and 22B. Is sandwiched between. The first transparent support layer 23A supports the first transparent electrode layer 22A, and the second transparent support layer 23B supports the second transparent electrode layer 22B.

  The light control layer 21 includes a liquid crystal composition. The light modulating layer 21 is made of, for example, a polymer network type liquid crystal (PNLC: Polymer Network Liquid Crystal), a polymer dispersed type liquid crystal (PDLC: Polymer Dispersed Liquid Crystal), a capsule type nematic liquid crystal (NCAP: Nematic Curvelined Acrylic etc.). Be composed. For example, a polymer network type liquid crystal includes a polymer network having a three-dimensional network, and holds liquid crystal molecules in voids of the polymer network. The liquid crystal molecules included in the light control layer 21 have, for example, a positive dielectric anisotropy, and the dielectric constant in the major axis direction of the liquid crystal molecules is larger than the dielectric constant in the minor axis direction of the liquid crystal molecules. Liquid crystal molecules include, for example, Schiff base, azo, azoxy, biphenyl, terphenyl, benzoate, tolan, pyrimidine, cyclohexanecarboxylate, phenylcyclohexane, and dioxane liquid crystal molecules. is there.

  Each of the first transparent electrode layer 22A and the second transparent electrode layer 22B is a conductive transparent layer. Examples of a material constituting the transparent electrode layers 22A and 22B include indium tin oxide (ITO), fluorine-doped tin oxide (FTO), tin oxide, zinc oxide, carbon nanotube (CNT), and poly (3,4-ethylenedioxide). Examples include a polymer containing (oxythiophene) (PEDOT), a multilayer film including an Ag alloy thin film, and the like.

  Each of the first transparent support layer 23A and the second transparent support layer 23B is a transparent base material. As the transparent support layers 23A and 23B, for example, a glass substrate or a silicon substrate, or a high-level material made of polyethylene, polystyrene, polyethylene terephthalate, polyvinyl alcohol, polycarbonate, polyvinyl chloride, polyimide, polysulfone, cycloolefin polymer, triacetyl cellulose, or the like is used. A molecular film is used.

  The light control sheet 20 may include another layer in addition to the light control layer 21, the transparent electrode layers 22A and 22B, and the transparent support layers 23A and 23B. Other layers, such as a layer having an ultraviolet barrier function, protect the light control layer 21 and the transparent electrode layers 22A and 22B, and contribute to control of light transmission in the light control sheet 20. And a layer for improving the properties of the light control sheet 20 such as strength and heat resistance.

  The first transparent electrode layer 22A is connected to a driving circuit through a first wiring section 30A, and the second transparent electrode layer 22B is connected to a driving circuit through a second wiring section 30B. Thereby, the transparent electrode layers 22A and 22B and the power supply are electrically connected. The drive circuit converts a voltage received from a power supply into a drive voltage and applies the drive voltage to the transparent electrode layers 22A and 22B through the wiring unit 30.

  When no drive voltage is applied to the transparent electrode layers 22A and 22B, the direction of the major axis direction of the liquid crystal molecules is irregular. Therefore, the light incident on the light control layer 21 is scattered, and the light control sheet 20 looks cloudy. That is, the light control sheet 20 is opaque. On the other hand, when a driving voltage is applied between the first transparent electrode layer 22A and the second transparent electrode layer 22B through the wiring section 30, the liquid crystal molecules are aligned, and the major axis direction of the liquid crystal molecules is changed to the transparent electrode layers 22A, 22B. The direction is along the direction of the electric field between them. As a result, light easily passes through the light control layer 21 and the light control sheet 20 becomes transparent.

  The light control sheet 20 may include a pair of alignment layers that sandwich the light control layer 21 between the light control layer 21 and the transparent electrode layers 22A and 22B. The alignment layer is a layer that controls the alignment of the liquid crystal molecules included in the light control layer 21 and aligns the liquid crystal molecules along the normal direction of the alignment layer when no driving voltage is applied. In the configuration including the alignment layer, the dimming sheet 20 becomes opaque when a driving voltage is applied to the transparent electrode layers 22A and 22B, and when the driving voltage is not applied to the transparent electrode layers 22A and 22B. 20 becomes transparent. Examples of the material constituting the alignment layer include polyamide, polyimide, polycarbonate, polystyrene, polysiloxane, polyester such as polyethylene terephthalate and polyethylene naphthalate, and polyacrylate such as polymethyl methacrylate. The alignment treatment for forming the alignment layer is, for example, a rubbing treatment, a polarized light irradiation treatment, or a fine processing treatment.

  Further, the light control layer 21 may include a dye having a predetermined color and not hindering the movement of the liquid crystal molecules according to the magnitude of the voltage applied to the light control layer 21. According to such a configuration, the light control sheet 20 having a predetermined color is realized.

  The light control sheet 20 is cut into a desired shape from, for example, a large-sized sheet including a multilayer body including each layer constituting the light control sheet 20. Therefore, each layer of the light control sheet 20 including the light control layer 21, the transparent electrode layers 22A and 22B, and the transparent support layers 23A and 23B extends to the end surface 20E of the light control sheet 20.

  The support substrate 40 is a transparent substrate. As a material of the support substrate 40, for example, glass, acrylic, polycarbonate, polyethylene, polypropylene, polyethylene terephthalate, or the like is used. In the present embodiment, an optical polyethylene terephthalate film is particularly preferably used as the support substrate 40. The thickness of the support base material 40 is smaller than the thickness of the light control sheet 20. The thickness of the support base material 40 is preferably 25 μm or more and 200 μm or less, and more preferably 25 μm or more and 190 μm or less. When the thickness of the supporting base material 40 is equal to or more than the lower limit, moderate rigidity for improving ease of handling is given to the light control unit 10 as compared with the case where the light control sheet 20 is handled alone. On the other hand, when the thickness of the supporting base material 40 is equal to or less than the upper limit, the flexibility of the light control unit 10 is suppressed from being excessively small as compared with the flexibility of the light control sheet 20. Also, even when the light control unit 10 is attached to a curved surface, the light control unit 10 can easily follow the curved surface.

  The light control sheet 20 is attached to the support substrate 40 via the transparent adhesive layer 60. The material of the transparent adhesive layer 60 is not particularly limited as long as it can form a transparent and adhesive layer. For example, an OCA (Optical Clear Adhesive) film has high transparency and is therefore suitable for use as the transparent adhesive layer 60. The transparent adhesive layer 60 is included in a constituent member of the light control unit 10.

  The waterproof part 50 is formed of any one of a waterproof tape, a hot melt adhesive, and a thermocompression bonding sheet. The end face waterproof part 51 and the wiring waterproof part 52 may be made of the same material, or may be made of different materials.

  The waterproof tape is a tape having a layer made of an adhesive on the surface of a water-resistant base material. For example, a tape having a layer of an acrylic pressure-sensitive adhesive on the surface of an acrylic foam substrate is preferably used because it has strong adhesiveness.

  As the hot melt adhesive, an ethylene vinyl acetate (EVA) -based or ethylene methyl methacrylate (EMMA) -based hot melt adhesive is suitably used. The waterproof part 50 made of a hot melt adhesive is formed using, for example, a glue gun. EVA-based and EMMA-based materials have high adhesion to polyethylene terephthalate films. Therefore, when a polyethylene terephthalate film is used as the support base material 40, it is preferable to use an EVA-based or EMMA-based material as the material of the waterproof portion 50.

  As the thermocompression bonding sheet, an EVA thermocompression bonding sheet is preferably used. When a thermocompression bonding sheet is used, for example, a portion of the waterproofing portion 50 that contacts the surface 20F of the light control sheet 20 is fixed to the surface 20F by thermocompression bonding, and the support base 40 of the waterproofing portion 50 is The portion in contact with the surface 40F is fixed to the surface 40F by thermocompression bonding.

  FIG. 3 is a diagram illustrating a mode when the light control unit 10 is used. The light control unit 10 is attached to the transparent plate 70. The transparent plate 70 is a transparent plate-shaped member made of glass, resin, or the like. The transparent plate 70 may be, for example, a building material such as a window glass or a glass wall, or a vehicle member such as a window glass of an automobile. The surface on which the light control unit 10 is mounted may be a flat surface or a curved surface.

  The light control unit 10 is attached to a transparent plate 70 via a transparent adhesive layer 61. Specifically, the transparent adhesive layer 61 is in contact with the surface of the support base 40 opposite to the surface on which the light control sheet 20 is attached, and is sandwiched between the support base 40 and the transparent plate 70. I have.

  The material of the transparent adhesive layer 61 is not particularly limited as long as it can form a transparent and adhesive layer. For example, an OCA film is suitable for use as the transparent adhesive layer 61 because it has high transparency.

  The light control unit 10 is provided with the transparent adhesive layer 61, and the light control unit 10 is transported to the construction site in a form in which the transparent adhesive layer 61 is adhered to the support substrate 40, and the light control unit 10 modulates the transparent plate 70 at the construction site. The attachment of the optical unit 10 may be performed. Alternatively, the dimming unit 10 is transported to the construction site in a form in which the transparent adhesive layer 61 is not attached to the support substrate 40, and the dimming unit 10, the transparent adhesive layer 61, and the transparent plate 70 are transported at the construction site. Assembly may be performed. Further, at the construction site, the light control sheet 20, the support base material 40, and the transparent plate 70 are attached to each other, and the waterproof plate 50 is disposed, thereby forming the transparent plate 70 to which the light control unit 10 is attached. May be done.

  In the light control unit 10 of the present embodiment, the back surface of the light control sheet 20 is covered with the support base material 40, and the end face 20E of the light control sheet 20 is covered with the end face waterproof portion 51. According to such a configuration, infiltration of moisture into the inside of the light control sheet 20 from the end face 20E is suppressed as compared with the form in which the end face 20E is exposed. Further, since the wiring portion 30 is covered with the wiring waterproofing portion 52, the wiring portion 30 is exposed from the vicinity of the portion where the wiring portion 30 is connected in the light control sheet 20 as compared with the form in which the wiring portion 30 is exposed. Infiltration of moisture into the light control sheet 20 is suppressed.

In particular, in the light control sheet 20 of the present embodiment, since the light control layer 21 reaches the end face 20E, if moisture enters from the end face 20E, the function of the light control layer 21 is likely to deteriorate. Therefore, it is highly useful to provide the end face waterproofing portion 51 that covers the end face 20E.
As a form to be compared with the present embodiment, there is a form in which the light control sheet 20 is directly attached to the transparent plate 70 without disposing the support base material 40, and the outer periphery of the light control sheet 20 is sealed with a resin. However, general resin sealing using an epoxy resin or the like merely increases the moisture resistance, that is, the resistance to moisture in the atmosphere, and cannot be said to be sufficiently waterproof against moisture caused by condensation or the like. On the other hand, in the embodiment including the waterproofing portion 50 of the present embodiment, the waterproofness can be improved as compared with the light control sheet 20 that has been subjected to resin sealing.

  Further, since the light control sheet 20 is attached in the plane of the support base material 40 which is slightly larger than the light control sheet 20, the back surface of the light control sheet 20 is in contact with the front surface 40F of the support base material 40. It is completely sealed by contact. Further, in forming the end face waterproof portion 51, a portion of the support base material 40 that protrudes outside the light control sheet 20 functions as a margin for disposing the end face waterproof portion 51, and the end face waterproof portion 51 is formed. Since it functions as a support for the forming material, the process for arranging the forming material and fixing the end face waterproof portion 51 such as heating and cooling can be performed easily and efficiently.

  Further, according to the present embodiment, the light control unit 20 is formed by disposing the light control sheet 20 and the waterproof unit 50 on the support base material 40 to form the light control unit 10 before transportation to the construction site. The light control sheet 20 can be transported and installed. According to this, the amount of work required for the construction is smaller than that of attaching the light control sheet 20 to the transparent plate 70 and arranging a waterproof member on the outer peripheral portion of the light control sheet 20 at the construction site. Reduction and time reduction are possible.

[Detailed configuration of waterproof part]
With reference to FIGS. 4 to 7, the detailed structure of the end face waterproof portion 51 will be described. 4 to 7 show the cross-sectional structure of the light control unit 10 along the width direction of the end face waterproofing portion 51, that is, the direction orthogonal to the end face 20E of the light control sheet 20.

  FIG. 4 shows a first embodiment of the end face waterproofing portion 51. The end surface waterproofing portion 51 of the first embodiment includes a first covering portion 51a that covers the end surface 20E of the light control sheet 20, and a second covering portion that extends from the end of the first covering portion 51a along the surface 40F of the support substrate 40. 51b, and a third covering portion 51c extending from the end of the first covering portion 51a along the surface 20F of the light control sheet 20. The second covering portion 51b contacts the surface 40F of the support base material 40, and the third covering portion 51c contacts the surface 20F of the light control sheet 20. The surface 40F of the support substrate 40 is a surface to which the light control sheet 20 is attached, and the surface 20F of the light control sheet 20 is the surface to which the light control sheet 20 is attached to the support substrate 40. The opposite side. Note that the first covering portion 51a also covers the end surface of the transparent adhesive layer 60.

FIG. 5 shows a second embodiment of the end face waterproofing portion 51. The end face waterproofing portion 51 of the second embodiment includes a first covering portion 51a and a second covering portion 51b, and does not include the third covering portion 51c.
FIG. 6 shows a third embodiment of the end face waterproofing portion 51. The end face waterproofing portion 51 of the third embodiment includes a first covering portion 51a and a third covering portion 51c, and does not include the second covering portion 51b.

FIG. 7 shows a fourth embodiment of the end face waterproofing portion 51. The end face waterproof portion 51 of the fourth embodiment includes a first covering portion 51a, and does not include a second covering portion 51b and a third covering portion 51c.
The end face waterproofing portion 51 may have any of the first, second, third, and fourth forms. In other words, the end face waterproofing part 51 only needs to cover at least the end face 20E of the light control sheet 20 in a portion where the light control sheet 20 includes the light control layer 21 and the transparent electrode layers 22A and 22B.

  Further, the end face waterproofing portion 51 may be constituted by a plurality of portions having different forms among the first form, the second form, the third form, and the fourth form. For example, when the outer shape of the light control sheet 20 is rectangular, the end face waterproof section 51 disposed on the upper edge portion of the light control sheet 20 and the end face waterproof section 51 disposed on the side edge portion of the light control sheet 20 And the cross-sectional shape in the width direction may be different.

  Even if the end face waterproof portion 51 is formed of a waterproof tape, a hot melt adhesive, or a thermocompression bonding sheet, the first embodiment can secure a large width of the end face waterproof portion 51 in the first embodiment. The formation of the end face waterproof portion 51 is easier than in a mode in which the width of the end face waterproof portion 51 needs to be formed small. Further, in the first embodiment, the end face waterproofing portion 51 covers the surface 40F of the support base material 40 and the surface 20F of the light control sheet 20 near the end face 20E of the light control sheet 20. Therefore, waterproofness against ingress of moisture from the end face 20E is particularly enhanced.

  When the end face waterproofing part 51 is made of a hot melt adhesive, the end face waterproofing part 51 is formed by disposing a molten resin near the end face 20E of the light control sheet 20 and curing the resin. Therefore, when the supporting base material 40 is arranged on a horizontal plane to form the end face waterproof portion 51, the second form of the end face waterproof portion 51 can also be easily formed.

  Further, when the end face waterproofing part 51 is formed of a hot melt adhesive, and when the support base material 40 is erected along the vertical direction at a construction site or the like to form the end face waterproofing part 51, for example, The third mode or the fourth mode can be adopted as the end face waterproofing portion 51 arranged on the upper edge portion of the light control sheet 20.

The detailed structure of the waterproof part 50 in the vicinity of the wiring part 30 will be described with reference to FIGS.
As shown in FIGS. 8 and 9 (a), the light control sheet 20 includes one surface of the first transparent electrode layer 22A, the light control layer 21, the second transparent electrode layer 22B, and the second transparent support layer. It has the first wiring area SA exposed from another layer of the light control sheet 20 including 23B. The first transparent support layer 23A supports the first transparent electrode layer 22A and is in contact with the transparent adhesive layer 60. The first wiring section 30A is connected to the first transparent electrode layer 22A in the first wiring area SA.

  The first wiring portion 30A only needs to have a configuration capable of conducting the first transparent electrode layer 22A and the drive circuit. For example, the first wiring unit 30A may include a conductive adhesive layer such as an anisotropic conductive film (ACF) and a flexible printed circuit (FPC). Alternatively, the first wiring portion 30A may have a structure in which a lead wire is fixed by solder to a laminate of a layer made of a conductive paste such as a silver paste and a conductive tape such as a copper tape.

  In the present embodiment, a configuration in which the first wiring portion 30A includes a conductive adhesive layer 31A bonded to the first transparent electrode layer 22A and an FPC 32A bonded to the conductive adhesive layer 31A is illustrated. The FPC 32A extends from the first wiring area SA to the outside of the support base 40 along the support base 40. A portion of the FPC 32A that extends to a region outside the light control sheet 20 on the support substrate 40 is attached to a surface 40F of the support substrate 40 via a waterproof adhesive layer 55A. The waterproof adhesive layer 55A is made of, for example, a double-sided waterproof tape.

  The first wiring waterproofing portion 52A is a portion of the first wiring region SA and the first wiring portion 30A that is connected to the first wiring region SA from the side opposite to the support base 40 with respect to the light control sheet 20. And covering. Further, the first wiring waterproof portion 52A extends from the first wiring region SA to a region outside the light control sheet 20, and a portion of the first wiring portion 30A that is attached to the support base 40 and a waterproof property. It covers the adhesive layer 55A.

  In a plan view as viewed from a position opposed to the front surface 20F of the light control sheet 20, the first wiring waterproof portion 52A extends on the support base material 40 to the outside of the first wiring portion 30A. Further, in the plan view, the first wiring waterproof portion 52A extends to the outside of the first wiring region SA, and on the light control sheet 20, the end of the first wiring waterproof portion 52A is located around the first wiring region SA. Covers surface 20F.

  In the region where the first wiring waterproof part 52A is located, the end face waterproof part 51 overlaps the first wiring waterproof part 52A on the side opposite to the support base 40 with respect to the first wiring waterproof part 52A. That is, the end face waterproofing portion 51 extends over the first wiring waterproofing portion 52A without interruption at the portion where the first wiring waterproofing portion 52A is located.

  As shown in FIG. 8 and FIG. 9B, the light control sheet 20 is configured such that one surface of the second transparent electrode layer 22 </ b> B includes the light control layer 21, the first transparent electrode layer 22 </ b> A, and the first transparent support layer. It has the second wiring area SB exposed from another layer of the light control sheet 20 including 23A. The second transparent support layer 23B supports the second transparent electrode layer 22B to form the surface 20F. The second wiring portion 30B is connected to the second transparent electrode layer 22B in the second wiring region SB.

  Like the first wiring portion 30A, the second wiring portion 30B only needs to have a configuration capable of conducting between the second transparent electrode layer 22B and the drive circuit. In the present embodiment, the configuration in which the second wiring portion 30B includes the conductive adhesive layer 31B bonded to the second transparent electrode layer 22B and the FPC 32B bonded to the conductive adhesive layer 31B is illustrated. The FPC 32B extends from the second wiring area SB to the outside of the support base 40 along the support base 40. A portion of the FPC 32B that extends to a region outside the light control sheet 20 on the support substrate 40 is attached to the support substrate 40 via a waterproof adhesive layer 55B. The waterproof adhesive layer 55B is made of, for example, a double-sided waterproof tape, similarly to the waterproof adhesive layer 55A. The waterproof adhesive layers 55A and 55B are included in the wiring waterproof section 52.

  The second wiring waterproof portion 52B is connected to the second wiring region SB in the second wiring region SB and the second wiring portion 30B from the side opposite to the support base 40 with respect to the light control sheet 20. And covering. Further, the second wiring waterproof portion 52B extends from the second wiring region SB to a region outside the light control sheet 20, and a portion of the second wiring portion 30B that is attached to the support base 40 and a waterproof property. It covers the adhesive layer 55B.

  In a plan view seen from a position facing the front surface 20F of the light control sheet 20, the second wiring waterproof portion 52B extends on the support base 40 to the outside of the second wiring portion 30B. Further, in the plan view, the second wiring waterproof part 52B extends to the outside of the second wiring area SB, and on the light control sheet 20, the end of the second wiring waterproof part 52B is located around the second wiring area SB. Covers surface 20F.

  In the area where the second wiring waterproofing section 52B is located, the end face waterproofing section 51 overlaps the second wiring waterproofing section 52B on the opposite side of the support base 40 with respect to the second wiring waterproofing section 52B. That is, the end face waterproofing part 51 extends over the second wiring waterproof part 52B without interruption at the position where the second wiring waterproof part 52B is located. In a mode in which the first wiring portion 30A and the second wiring portion 30B are arranged along one side of the light control sheet 20, the end face waterproofing portion 51 passes over the first wiring waterproofing portion 52A and the second wiring waterproofing portion 52B. Thus, the light control sheet 20 extends from one end of the one side to the other end.

  In the above configuration, the end face waterproof portion 51 surrounds the entire circumference of the light control sheet 20. According to such a configuration, the end face waterproof part 51 can be formed continuously without interruption even in the wiring part 30, so that the end face waterproof part 51 is easily formed.

  In FIGS. 1 and 8, a corner of the light control sheet 20, that is, a portion where the two sides of the light control sheet 20 intersect, along one of the two sides of the end face waterproofing portion 51. The example in which the end of the extending part and the end of the part extending along the other side are in contact is illustrated. The structure of the end face waterproofing portion 51 arranged at the corner is not limited to the above structure. For example, the end face waterproofing portion 51 may be bent at a corner portion of the light control sheet 20 and may extend continuously from the one side to the other side.

FIG. 10 and FIG. 11 show another embodiment of the waterproof part 50 near the wiring part 30.
As shown in FIG. 10, the end face waterproofing part 51 may be interrupted at each of the portion where the first wiring waterproofing portion 52A is located and the portion where the second wiring waterproofing portion 52B is located.

  In the above configuration, the waterproofing portion 50 surrounds the entire circumference of the light control sheet 20 by connecting the end face waterproofing portion 51 and the wiring waterproofing portion 52.

  For example, in a configuration in which the first wiring portion 30A and the second wiring portion 30B are arranged along one side of the light control sheet 20, the end face waterproofing portion 51 is configured such that the first surface of the light control sheet 20 extends from one end of the one side to the first side. Includes a portion extending to the wire waterproof portion 52A, a portion extending from the other end of the one side to the second wire waterproof portion 52B, and a portion connecting the first wire waterproof portion 52A and the second wire waterproof portion 52B. .

  As shown in FIGS. 11A and 11B, the end face waterproofing part 51 is not disposed on each of the first waterproofing part 52A and the second waterproofing part 52B. At each end of the first waterproofing section 52A and the second waterproofing section 52B, the waterproofing sections 52A and 52B and the waterproofing section 51 may overlap.

  According to the above configuration, since the end face waterproof portion 51 is interrupted at the portion of the wiring section 30, the material for forming the end face waterproof portion 51 can be reduced. In addition, the formation of unevenness due to the overlap between the wiring waterproof portions 52A and 52B and the end face waterproof portion 51 is suppressed.

As described above, according to the present embodiment, the following effects can be obtained.
(1) Since the back surface of the light control sheet 20 is covered with the support base material 40 and the end surface 20E of the light control sheet 20 is covered with the first covering portion 51a of the end surface waterproof portion 51, the end surface 20E is exposed. As compared with the configuration, it is possible to prevent moisture from entering the inside of the light control sheet 20 from the end face 20E. Therefore, the waterproofness of the light control sheet 20 can be improved. Further, since the light control sheet 20 and the waterproof section 50 are disposed on the support base material 40, the light control sheet 20 can be transported and constructed as the light control unit 10. Therefore, it is possible to reduce the amount of work and the time required for construction.

  (2) Since the waterproof portion 50 is made of a waterproof tape, an EVA-based or EMMA-based hot-melt adhesive, or a thermocompression-bonded sheet, good waterproofness can be obtained. Further, when the supporting base material 40 is a polyethylene terephthalate film, the waterproof part 50 is made of EVA or EMMA-based material, so that the adhesion of the waterproof part 50 to the supporting base material 40 is increased. The waterproofness of the is further improved.

  (3) If the end face waterproofing part 51 includes the second covering part 51b in addition to the first covering part 51a, the end face waterproofing part 51 is near the end face 20E of the light control sheet 20 and the surface of the support base material 40. Since 40F is also covered, it is possible to further suppress the entry of moisture into the inside of the light control sheet 20 from the end face 20E.

  (4) If the end face waterproofing part 51 includes the third covering part 51c in addition to the first covering part 51a, the end face waterproofing part 51 is near the end face 20E of the light controlling sheet 20 and the surface of the light controlling sheet 20. 20F is also covered, so that the infiltration of moisture into the light control sheet 20 from the end face 20E is further suppressed.

  (5) Since the wiring regions SA and SB are covered with the wiring waterproofing portion 52, it is possible to prevent moisture from entering the inside of the light control sheet 20 from the vicinity of the wiring regions SA and SB. Therefore, the waterproofness of the light control sheet 20 can be improved.

  (6) If the dimming unit 10 has a configuration in which the transparent adhesive layer 61 is provided on the surface of the support base 40 opposite to the surface on which the dimming sheet 20 is adhered, the transparent adhesive layer 61 is dimmed. By attaching the light control unit 10 to the mounting target of the sheet 20, the light control unit 10 can be mounted to the mounting target. Therefore, since the light control sheet 20 can be attached to the above-mentioned mounting object in a form in which waterproof measures are taken as the light control unit 10, the light control sheet 20 can be easily installed.

(Modification)
The above embodiment can be modified and implemented as follows.
The number of wiring portions provided in the light control unit 10 may not be two, and the number of wiring regions included in the light control sheet 20 may not be two. For example, the dimming unit 10 may include a plurality of first wiring portions 30A and a plurality of second wiring portions 30B, and when the FPC having conductors on both sides is used, the number of wiring portions is one. It may be. The light control sheet 20 may have a number of wiring regions corresponding to the number of wiring portions.

  The light control unit 10 may be attached to the transparent plate 70 by attaching the front surface 20F of the light control sheet 20 instead of the support base material 40.

  SA, SB: wiring area, 10: light control unit, 20: light control sheet, 21: light control layer, 22A, 22B: transparent electrode layer, 23A, 23B: transparent support layer, 30, 30A, 30B: wiring section, 31A, 31B ... conductive adhesive layer, 32A, 32B ... FPC, 40 ... support base material, 50 ... waterproof part, 51 ... end face waterproof part, 51a ... first covering part, 51b ... second covering part, 51c ... third Covering parts, 52, 52A, 52B: waterproof wiring parts, 55A, 55B: waterproof adhesive layers, 60, 61: transparent adhesive layers, 70: transparent plates.

Claims (7)

A light control layer that holds the liquid crystal composition in the voids of the polymer network, and a light control sheet including a pair of transparent electrode layers sandwiching the light control layer,
A supporting substrate having an outer shape larger than the light control sheet,
A coating that extends along the outer edge of the light control sheet on the support base material and covers the end surface of the light control sheet, and suppresses moisture from entering from the outside of the light control sheet toward the inside of the light control layer. Department and
A pair of wiring portions connected one by one to each transparent electrode layer and extending to the outside of the support base material;
A waterproof adhesive layer that is positioned one by one between each wiring portion and the support base material and affixes each wiring portion to the support base material ,
The light control unit, wherein the light control sheet is attached to the support base in a state where the light control sheet is located inside the support base in a plan view facing the surface of the light control sheet. The light control unit according to claim 1, wherein the covering portion is formed of a waterproof tape , an EVA-based or EMMA-based hot melt adhesive, or a thermocompression bonding sheet . The coating portion is a first coating portion,
The dimmer unit is dimmer unit as claimed in claim 1 or 2 further comprising a second cover portion from the first cover portion extending along the surface of the supporting substrate. The coating portion is a first coating portion,
The light control unit according to any one of claims 1 to 3 , wherein the light control unit further includes a third covering portion extending from the first covering portion along a surface of the light controlling sheet. The dimming sheet has a wiring region to which a wiring unit for connecting the transparent electrode layer and a power supply is connected,
The light control unit according to any one of claims 1 to 4 , wherein the light control unit includes a wiring waterproof unit that covers the wiring region from a side opposite to the support base with respect to the light control sheet. The light control unit according to any one of claims 1 to 5 , further comprising a transparent adhesive layer located on a surface of the support base opposite to a surface on which the light control sheet is attached.   A light control unit according to claim 6,
  And a transparent plate,
  The transparent adhesive layer of the light control unit is attached to the transparent plate
  Light control unit with transparent plate.

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