Dimming sheet, and method for manufacturing a dimming sheet

Abstract

To provide a dimming sheet and a manufacturing method of the dimming sheet, that can obtain a dimming sheet in which a conductive surface and a flexible printed board are made water-proof, before sticking the dimming sheet on a transparent support.SOLUTION: A dimming sheet 10 comprises: a first sheet portion 10A including a first portion of a first transparent conductive sheet, a first portion of a second transparent conductive sheet, and a dimming layer; a second sheet portion 10B which includes a second portion of the first transparent conductive sheet, and is connected to the first sheet portion; a flexible print board 11 connected to a conductive surface 10BC of the second sheet portion 10B; a first water-proof tape 12 covering the conductive surface 10BC of the second sheet portion 10B and the flexible print board 11; and a second water-proof tape 13 which covers the surface on an opposite side of the conductive surface 10BC of the second sheet portion 10B, and the flexible print board 11, and which is stuck on the first water-proof tape 12.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a dimming sheet and a method for manufacturing the dimming sheet.

Background Art

[0002] The dimming sheet includes a first transparent conductive sheet, a second transparent conductive sheet, and a dimming layer positioned between the first transparent conductive sheet and the second transparent conductive sheet. Each transparent conductive sheet includes a transparent electrode layer and a transparent substrate that supports the transparent electrode layer. The dimming layer is sandwiched between a pair of transparent electrode layers. The dimming layer includes a transparent resin layer and a liquid crystal composition. The dimming sheet is configured to be capable of having two or more haze values depending on the magnitude of the voltage applied to the dimming layer. The dimming sheet is attached to a transparent support, whereby a laminate of the dimming sheet and the transparent support can have two or more haze values. The transparent support is, for example, a window of a building, a partition located within a building, and a window of a vehicle (see, for example, Patent Document 1).

[0003] FIG. 3 shows an example of a dimming body including a dimming sheet and a transparent support. As shown in FIG. 3, the dimming body 100 includes a dimming sheet 101. The dimming sheet 101 includes a first transparent conductive sheet 101A and a second transparent conductive sheet 101B. The first transparent conductive sheet 101A covers the second transparent conductive sheet 101B, and an electrode portion 101B1, which is a part of the second transparent conductive sheet 101B, is exposed from the first transparent conductive sheet 101A. The dimming sheet 101 is mounted within a transparent support 102 that is larger than the dimming sheet 101.

[0004] A flexible printed circuit board (FPC) 103 for connecting the dimming sheet 101 to the drive unit is connected to the electrode section 101B1. The FPC 103 has a T-shape. Part of the FPC 103 extends beyond the dimming sheet 101 and covers part of the transparent support 102. The portion of the FPC 103 located on the transparent support 102 is attached to the transparent support 102 by an adhesive layer 104.

[0005] The dimming unit 100 is equipped with a waterproof tape 105. The waterproof tape 105 is attached to a part of the dimming sheet 101 and a part of the transparent support 102 so as to span the electrode portion 101B1 and the portion of the transparent support 102 located outside the dimming sheet 101. In this way, the waterproof tape 105 covers the portion of the FPC 103 that is connected to the electrode portion 101B1 and the portion that is attached to the transparent support 102 by the adhesive layer 104.

[0006] Figure 4 shows the cross-sectional structure along the line IV-IV shown in Figure 3. As shown in Figure 4, the dimming sheet 101 includes a dimming layer 101C located between the first transparent conductive sheet 101A and the second transparent conductive sheet 101B. The dimming layer 101C includes a transparent resin layer and a liquid crystal composition, and is configured to have two or more haze values ​​depending on the magnitude of the voltage applied to the dimming layer 101C.

[0007] The light-adjusting sheet 101 is attached to the transparent support 102 by a transparent adhesive layer 106. The FPC 103 is connected to the second transparent conductive sheet 101B by an anisotropic conductive film (ACF) 107. The waterproof tape 105 covers a portion of the first transparent conductive sheet 101A, the electrode portion 101B1 of the second transparent conductive sheet 101B, and the FPC 103. Furthermore, since the waterproof tape 105 sandwiches the FPC 103 together with the adhesive layer 104, the connection between the FPC 103 and the electrode portion 101B1 is waterproofed. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Japanese Patent Publication No. 2017-187775 [Overview of the Initiative] [Problems that the invention aims to solve]

[0009] By the way, in the dimming unit 100, the waterproof tape 105 was attached so as to span across the dimming sheet 101 and the transparent support 102, meaning that the waterproof tape 105 could not be attached until the dimming sheet 101 had been attached to the transparent support 102. [Means for solving the problem]

[0010] A dimming sheet for solving the above problems comprises a first transparent conductive sheet, a second transparent conductive sheet, and a dimming layer located between the first transparent conductive sheet and the second transparent conductive sheet. The dimming sheet comprises a first sheet portion including a first part of the first transparent conductive sheet, a first part of the second transparent conductive sheet, and the dimming layer, a second sheet portion including a second part of the first transparent conductive sheet and connected to the first sheet portion, a flexible printed circuit board connected to the conductive surface of the second sheet portion, a first waterproof tape covering the conductive surface of the second sheet portion and the flexible printed circuit board, and a second waterproof tape covering the surface of the second sheet portion opposite to the conductive surface and the flexible printed circuit board, and attached to the first waterproof tape.

[0011] A method for manufacturing a dimmable sheet to solve the above problems is a method for manufacturing a dimmable sheet comprising a first transparent conductive sheet, a second transparent conductive sheet, and a dimmable layer located between the first transparent conductive sheet and the second transparent conductive sheet. The manufacturing method includes forming a first sheet portion including a first part of the first transparent conductive sheet, a first part of the second transparent conductive sheet, and the dimmable layer, and a second sheet portion including a second part of the first transparent conductive sheet and connected to the first sheet portion, connecting a flexible printed circuit board to the conductive surface of the second sheet portion, covering the conductive surface of the second sheet portion and the flexible printed circuit board with a first waterproof tape, and attaching a second waterproof tape to the first waterproof tape so as to cover the surface of the second sheet portion opposite to the conductive surface and the flexible printed circuit board.

[0012] According to the above-described dimming sheet and method for manufacturing the dimming sheet, the second sheet portion exposed to the outside and the flexible printed circuit board connected to the second sheet portion are covered with two waterproof tapes. Therefore, a dimming sheet with waterproof conductive surfaces and flexible printed circuit boards can be obtained before attaching the dimming sheet to a transparent support.

[0013] The dimming sheet has a straight edge and a protruding portion that extends from the edge, the protruding portion including a part of the first sheet portion and the second sheet portion, and the first waterproof tape and the second waterproof tape may cover the protruding portion, excluding the base end of the protruding portion.

[0014] According to the above-described dimming sheet, since the first waterproof tape and the second waterproof tape cover the portion of the protruding part excluding the base end, the occurrence of a step difference in the portion inside the edge, which is the part to which the dimming sheet is attached to the object it is attached to, is suppressed.

[0015] In the above-described dimming sheet, the side edges may extend along a first direction, and the protruding portions may have a shape that extends along the first direction. According to this dimming sheet, since the protruding portions have a shape that extends along the first direction, the protruding portions are less likely to be bent compared to the case where the protruding portions extend along a direction intersecting the first direction.

[0016] The above-described dimming sheet further includes a sealing portion that covers an end surface of the second transparent conductive sheet and an end surface of the dimming layer at a boundary between the first sheet portion and the second sheet portion, and the first waterproof tape may cover the sealing portion.

[0017] According to the above-described dimming sheet, since the end surface of the dimming layer is covered by the sealing portion and further covered by the first waterproof tape, it is further suppressed that moisture reaches from the outside of the dimming layer to the inside of the dimming layer.

Advantages of the Invention

[0018] According to the present invention, a dimming sheet in which a conductive surface and a flexible printed circuit board are waterproofed can be obtained before attaching the dimming sheet to a transparent support.

Brief Description of the Drawings

[0019] [Figure 1] FIG. 1 is a plan view of a dimming sheet according to an embodiment. [Figure 2] FIG. 2 is a cross-sectional view showing a structure along line II-II shown in FIG. 1. [Figure 3] FIG. 3 is a plan view of a conventional dimming sheet. [Figure 4] FIG. 4 is a cross-sectional view showing a structure along line IV-IV shown in FIG. 3.

Embodiments for Carrying Out the Invention

Brief Description of the Drawings

[0019] <id= [Figure 1] FIG. 1 is a plan view of a dimming sheet according to an embodiment. [Figure 2] FIG. 2 is a cross-sectional view showing a structure along line II-II shown in FIG. [Figure 3] FIG is a plan view of a conventional dimming sheet. [Figure 4] FIG. 4 is a cross-sectional view showing a structure along line IV-IV shown in FIG. 3.

Embodiments for Carrying Out the Invention

[0020] Referring to FIGS. 1 and 2, an embodiment of a dimming sheet and a method for manufacturing the dimming sheet will be described. Note that the type of the dimming sheet of the present disclosure may be a normal type or a reverse type.

[0021] [Dimming sheet] The dimming sheet 10 shown in FIG. 1 includes a first transparent conductive sheet 10T1 (see FIG. 2), a second transparent conductive sheet 10T2 (see FIG. 2), and a dimming layer 10D (see FIG. 2). The dimming layer 10D is located between the first transparent conductive sheet 10T1 and the second transparent conductive sheet 10T2.

[0022] The dimming sheet 10 includes a first sheet portion 10A and a second sheet portion 10B. The first sheet portion 10A includes a first portion of the first transparent conductive sheet 10T, a first portion of the second transparent conductive sheet 10T2, and the dimming layer 10D. The second sheet portion 10B includes a second portion of the first transparent conductive sheet 10T1 and is connected to the first sheet portion 10A. The second portion of the first transparent conductive sheet 10T1 is a portion different from the first portion of the first transparent conductive sheet 10T1. The second transparent conductive sheet 10T2 includes a portion exposed from the first transparent conductive sheet 10T1. In the second transparent conductive sheet 10T2, the portion excluding the portion exposed from the first transparent conductive sheet 10T1 is the first portion of the second transparent conductive sheet 10T2.

[0023] The dimming sheet 10 includes a flexible printed circuit board (FPC) 11, a first waterproof tape 12, and a second waterproof tape 13. The FPC 11 is connected to the conductive surface 10BC of the second sheet portion 10B. The first waterproof tape 12 covers the conductive surface 10BC of the second sheet portion 10B and the flexible printed circuit board 11. The second waterproof tape 13 covers the surface of the second sheet portion 10B opposite to the conductive surface 10BC and the flexible printed circuit board 11 and is attached to the first waterproof tape 12.

[0024] Thus, according to the dimmable sheet 10 of this disclosure, the conductive surface 10BC exposed to the outside and the FPC 11 connected to the conductive surface 10BC are covered with two waterproof tapes 12 and 13. Therefore, a dimmable sheet 10 with the conductive surface 10BC and FPC 11 waterproofed can be obtained before attaching the dimmable sheet 10 to a transparent support. In other words, with the dimmable sheet 10, waterproofing of the conductive surface 10BC and FPC 11 is not performed during the installation of the dimmable sheet 10, but rather before shipment of the dimmable sheet 10. Therefore, variations in the processing method for waterproofing the conductive surface 10BC and FPC 11 can be suppressed, which in turn suppresses variations in the quality related to waterproofing, and makes it easier to control the quality related to waterproofing.

[0025] The dimming sheet 10 has a straight edge 10E and a protruding portion 10C that extends from the edge 10E. The outer edge of the dimming sheet 10, excluding the protruding portion 10C, has, for example, a rectangular shape, and the edge 10E is part of this rectangle. The protruding portion 10C includes a part of the first sheet portion 10A and a second sheet portion 10B. Within the first sheet portion 10A, the portion that extends from the edge 10E is the first sheet protruding portion 10A1. The second sheet portion 10B is connected to the first sheet protruding portion 10A1.

[0026] The first waterproof tape 12 and the second waterproof tape 13 cover the protrusion 10C, excluding its base end. The portion of the protrusion 10C connected to the edge 10E is the base end, and the end opposite the base end is the tip. The base end of the protrusion 10C is included in the first sheet protrusion 10A1. With the dimming sheet 10, since the first waterproof tape 12 and the second waterproof tape 13 cover the portion of the protrusion 10C excluding the base end, the occurrence of a step in the portion inside the edge 10E, which is the portion attached to the transparent support to which the dimming sheet 10 is mounted, is suppressed. As a result, when the portion inside the edge 10E is attached to the transparent support, the occurrence of a gap between the transparent support and the dimming sheet 10 is suppressed.

[0027] The end edge 10E extends along the first direction. The protruding portion 10C has a shape that extends along the first direction. Because the protruding portion 10C has a shape that extends along the first direction, it is less likely to be bent compared to the case where the protruding portion 10C extends along a direction intersecting the first direction.

[0028] The dimming sheet 10 comprises a surface 10F and a back surface 10R opposite to the surface 10F. Figure 1 shows the planar structure of the dimming sheet 10 as viewed from a viewpoint opposite the surface 10F of the dimming sheet 10. Of the second sheet portion 10B, the conductive surface 10BC is included in the surface 10F. A step is located at the boundary between the second sheet portion 10B and the first sheet protrusion 10A1, and this step is included in the surface 10F. On the other hand, of the second sheet portion 10B, the surface opposite to the conductive surface 10BC is included in the back surface 10R.

[0029] The FPC11 has a T-shape. The FPC11 is connected to the conductive surface 10BC and protrudes from the conductive surface 10BC in a direction perpendicular to the first direction. The FPC11 has a front surface and a back surface opposite to the front surface. The FPC11 is connected to the conductive surface 10BC on its back surface.

[0030] In the example shown in Figure 1, the protrusion 10C has a rectangular shape extending along the first direction. The first sheet protrusion 10A1 and the second sheet portion 10B included in the protrusion 10C also have a rectangular shape extending along the first direction.

[0031] The first waterproof tape 12 has a rectangular shape when viewed from a viewpoint facing the surface 10F of the dimming sheet 10. In the first direction, the length of the first waterproof tape 12 is longer than the length of the protrusion 10C. In a direction perpendicular to the first direction, the width of the first waterproof tape 12 is longer than the width of the protrusion 10C. The first waterproof tape 12 covers a portion of the first sheet protrusion 10A1 that is included in the surface 10F, the entire conductive surface 10BC, and a portion of the surface of the FPC 11, so as to cover the boundary between the first sheet protrusion 10A1 and the second sheet portion 10B. The first waterproof tape 12 extends beyond the protrusion 10C at both ends in the first direction. The first waterproof tape 12 extends beyond the tip of the protrusion 10C in a direction perpendicular to the first direction.

[0032] The second waterproof tape 13 has a rectangular shape when viewed from a viewpoint facing the surface 10F of the dimming sheet 10. The second waterproof tape 13 has the same shape and size as the first waterproof tape 12. The second waterproof tape 13 covers a portion of the first sheet protrusion 10A1 that is included in the back surface 10R, the entire surface of the second sheet portion 10B opposite to the conductive surface 10BC, and a portion of the back surface of the FPC 11. The second waterproof tape 13 protrudes from the protrusion 10C at both ends in the first direction. The second waterproof tape 13 protrudes from the tip of the protrusion 10C in a direction perpendicular to the first direction. When viewed from a viewpoint facing the surface 10F of the dimming sheet 10, the entire second waterproof tape 13 overlaps the entire first waterproof tape 12.

[0033] As a result, the end face of the protruding portion 10C is sandwiched between the first waterproof tape 12 and the second waterproof tape 13, further enhancing the waterproofing effect of the waterproof tapes 12 and 13. The end face of the protruding portion 10C is a part of the surface connecting the front surface 10F and the back surface 10R of the dimming sheet 10.

[0034] Figure 2 shows the cross-sectional structure of the dimming sheet 10 along the line II-II shown in Figure 1. As shown in Figure 2, the dimming sheet 10 comprises a first transparent conductive sheet 10T1, a second transparent conductive sheet 10T2, and a dimming layer 10D. The dimming layer 10D is located between the first transparent conductive sheet 10T1 and the second transparent conductive sheet 10T2.

[0035] The dimming sheet 10 further includes a sealing portion 14 at the boundary between the first sheet portion 10A and the second sheet portion 10B, which covers the end face of the second transparent conductive sheet 10T2 and the end face of the dimming layer 10D. The first waterproof tape 12 covers the sealing portion 14. The end face of the second transparent conductive sheet 10T2 is the surface connecting the front and back surfaces of the second transparent conductive sheet 10T2. The end face of the dimming layer 10D is the surface connecting the front and back surfaces of the dimming layer 10D. In this way, since the end face of the dimming layer 10D is covered by the sealing portion 14 and then further covered by the first waterproof tape 12, moisture reaching the inside of the dimming layer 10D from the outside is further suppressed.

[0036] The dimming sheet 10 further comprises an anisotropic conductive film (ACF) 15. The FPC 11 is connected to the conductive surface 10BC of the second sheet portion 10B by the ACF 15. In the dimming sheet 10, the boundary between the first sheet portion 10A and the second sheet portion 10B, the conductive surface 10BC, and the connection between the conductive surface 10BC and the FPC 11 are sandwiched between the first waterproof tape 12 and the second waterproof tape 13 in the thickness direction of the dimming sheet 10. Therefore, moisture reaching these conductive parts from outside the dimming sheet 10 is prevented by the first waterproof tape 12 and the second waterproof tape 13.

[0037] [Manufacturing method for dimmable sheets] The manufacturing method for the dimming sheet 10 of this disclosure includes forming a first sheet portion 10A including a first portion of a first transparent conductive sheet 10T1, a first portion of a second transparent conductive sheet 10T2, and a dimming layer 10D, and a second sheet portion 10B including a second portion of the first transparent conductive sheet 10T1 and connected to the first sheet portion 10A. The manufacturing method also includes connecting an FPC 11 to the conductive surface 10BC of the second sheet portion 10B. The manufacturing method also includes covering the conductive surface 10BC of the second sheet portion 10B and the FPC 11 with a first waterproof tape 12, and attaching a second waterproof tape 13 to the first waterproof tape 12 so as to cover the surface of the second sheet portion 10B opposite to the conductive surface 10BC and the FPC 11.

[0038] When manufacturing the dimming sheet 10, first, a first transparent conductive sheet 10T1 and a second transparent conductive sheet 10T2 are prepared. Each transparent conductive sheet 10T1, 10T2 comprises a transparent electrode layer and a base sheet that supports the transparent electrode layer, if the dimming sheet 10 is of the normal type. The material for forming the transparent electrode layer may be any one selected from the group consisting of, for example, indium tin oxide, fluorine-doped tin oxide, tin oxide, zinc oxide, carbon nanotubes, and poly(3,4-ethylenedioxythiophene). The material for forming the base sheet may be a synthetic resin or an inorganic compound. The synthetic resin may be, for example, a polyester resin, a polyacrylate resin, a polycarbonate resin, or a polyolefin resin. The polyester resin may be, for example, polyethylene terephthalate or polyethylene naphthalate. The polyacrylate resin may be, for example, polymethyl methacrylate. The inorganic compound may be, for example, silicon dioxide, silicon oxynitride, or silicon nitride.

[0039] Furthermore, if the dimming sheet 10 is of the reverse type, each transparent conductive sheet 10T1, 10T2 further comprises a vertical orientation layer located on the opposite side of the transparent electrode layer from the base sheet. The material for forming the orientation layer is an organic compound, an inorganic compound, or a mixture thereof. Examples of organic compounds include polyimide, polyamide, polyvinyl alcohol, and cyanide compounds. Examples of inorganic compounds include silicon oxide and zirconium oxide. The material for forming the orientation layer may also be silicone. Silicone is a compound having an inorganic part and an organic part.

[0040] Next, a coating solution for forming the light-adjusting layer 10D is prepared. The coating solution includes, for example, a photopolymerizable composition, a polymerization initiator, and a liquid crystal compound. The coating solution may also contain a dichroic dye and various additives. By irradiating the coating solution with light while it is sandwiched between the first transparent conductive sheet 10T1 and the second transparent conductive sheet 10T2, the photopolymerizable composition is polymerized in the coating solution. This forms a light-adjusting layer containing a transparent polymer layer with voids and a liquid crystal composition located within the voids. This results in a laminate containing a pair of transparent conductive sheets 10T1, 10T2 and the light-adjusting layer 10D.

[0041] Then, by cutting the outer periphery of the laminate, an edge 10E and a protruding portion 10C protruding from the edge 10E are formed. Furthermore, by removing a part of the second transparent conductive sheet 10T2 and a part of the light-adjusting layer 10D at the tip of the protruding portion 10C, a first sheet portion 10A and a second sheet portion 10B having a conductive surface 10BC are formed.

[0042] Next, after attaching the ACF15 to the conductive surface 10BC, the FPC11 is attached to the ACF15, thereby connecting the FPC11 to the conductive surface 10BC. Subsequently, the first waterproof tape 12 and the second waterproof tape 13 are attached in the thickness direction of the laminate so as to sandwich the laminate. This allows the dimming sheet 10 to be obtained.

[0043] Each waterproof tape 12, 13 has, for example, a base layer and an adhesive layer. The base layer may be formed from, for example, acrylic foam. The adhesive layer may be formed from, for example, an acrylic adhesive.

[0044] As described above, according to one embodiment of the dimming sheet, the following effects can be obtained. (1) Since the conductive surface 10BC and the FPC 11 are covered with two waterproof tapes 12 and 13, a light-adjusting sheet 10 with waterproof conductive surface 10BC and FPC 11 can be obtained before attaching the light-adjusting sheet 10 to the transparent support.

[0045] (2) Since the first waterproof tape 12 and the second waterproof tape 13 cover the portion of the protruding portion 10C excluding the base end, the occurrence of a step in the portion inside the edge 10E, which is the portion of the dimming sheet 10 that is attached to the mounting target, is suppressed.

[0046] (3) Because the protruding portion 10C has a shape that extends along the first direction, the protruding portion 10C is less likely to be bent compared to the case where the protruding portion 10C extends along a direction intersecting the first direction. (4) Since the end face of the dimming layer 10D is covered by the sealing portion 14 and then further covered by the first waterproof tape 12, moisture is further prevented from reaching the inside of the dimming layer 10D from the outside.

[0047] The above-described embodiment can be implemented with the following modifications. [Protrusion] The protruding portion 10C may have a shape that extends in a direction intersecting the first direction in which the end edge 10E extends. Even in this case, the effects similar to those described in (1) above can be obtained.

[0048] The dimming sheet 10 does not necessarily have a protruding portion 10C. Even in this case, the effect similar to (1) described above can be obtained by providing the dimming sheet 10 with a second sheet portion 10B connected to the first sheet portion 10A, and by covering the conductive surface 10BC of the second sheet portion 10B and the FPC 11 with waterproof tapes 12 and 13. However, in order to prevent gaps from forming between the transparent support and the dimming sheet 10 when it is attached to the transparent support to be mounted, it is preferable for the dimming sheet 10 to have a protruding portion 10C.

[0049] [Sealing part] The dimming sheet 10 does not necessarily have a sealing portion 14. Even in this case, it is possible to prevent moisture from reaching the inside of the dimming layer 10D from the outside of the dimming layer 10D using the first waterproof tape 12 and the second waterproof tape 13. [Explanation of Symbols]

[0050] 10… Dimming sheet 10A...First sheet section 10B...Second sheet section 10BC…Conductive surface 10C…Protrusion 10D…Photochromic layer 10T1…First transparent conductive sheet 10T2…Second transparent conductive sheet 11… Flexible printed circuit board 12…First waterproof tape 13…Second waterproof tape 14…Sealing part

Claims

1. A dimming sheet comprising a first transparent conductive sheet, a second transparent conductive sheet, and a dimming layer positioned between the first transparent conductive sheet and the second transparent conductive sheet, The first portion of the first transparent conductive sheet, the first portion of the second transparent conductive sheet, and the first sheet portion including the light-adjusting layer, The second sheet portion includes the second portion of the first transparent conductive sheet and is connected to the first sheet portion, A flexible printed circuit board connected to the conductive surface of the second sheet portion, A first waterproof tape covers the conductive surface of the second sheet portion and the flexible printed circuit board, The second waterproof tape covers the side of the second sheet portion opposite to the conductive surface and the flexible printed circuit board, and is attached to the first waterproof tape. The edges have straight lines, It comprises a protruding portion that extends from the aforementioned end edge, The aforementioned protruding portion includes a part of the first sheet portion and the second sheet portion, The first waterproof tape and the second waterproof tape cover the protrusion, excluding the base end of the protrusion. Dimming sheet.

2. The aforementioned end edge extends along the first direction, The protruding portion has a shape that extends along the first direction. The dimming sheet according to claim 1.

3. The boundary between the first sheet portion and the second sheet portion further includes a sealing portion that covers the end face of the second transparent conductive sheet and the end face of the light-adjusting layer, The first waterproof tape covers the sealing portion. The dimming sheet according to claim 1 or 2.

4. A method for manufacturing a light-adjusting sheet comprising a first transparent conductive sheet, a second transparent conductive sheet, and a light-adjusting layer positioned between the first transparent conductive sheet and the second transparent conductive sheet, To form a first sheet portion including a first portion of the first transparent conductive sheet, a first portion of the second transparent conductive sheet, and the light-adjusting layer, and a second sheet portion including a second portion of the first transparent conductive sheet and connected to the first sheet portion, Connecting a flexible printed circuit board to the conductive surface of the second sheet portion, The conductive surface of the second sheet portion and the flexible printed circuit board are covered with the first waterproof tape, and This includes attaching the second waterproof tape to the first waterproof tape so as to cover the surface of the second sheet portion opposite to the conductive surface and the flexible printed circuit board, The aforementioned dimming sheet is The edges have straight lines, It comprises a protruding portion that extends from the aforementioned end edge, The aforementioned protruding portion includes a part of the first sheet portion and the second sheet portion, The first waterproof tape and the second waterproof tape cover the protrusion, excluding the base end of the protrusion. A method for manufacturing dimmable sheets.

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