JP2023172066A - Flexible wiring board unit, and dimming unit - Google Patents

Abstract

To provide a flexible wiring board unit and a dimming unit capable of changing arrangement of a second flexible wiring board to a first flexible wiring board.SOLUTION: A flexible wiring board unit comprises a first flexible wiring board 60 extending in a first direction D1 and a second flexible wiring board 70 extending in a second direction D2. The first flexible wiring board 60 comprises a first adhered terminal 61P, a second adhered terminal 62P, a plurality of first relay terminals 63P, and a plurality of second relay terminals 64P. In the first direction D1, the first relay terminals 63P and the second relay terminals 64P are arranged in a line alternately at a constant pitch. The second flexible wiring board 70 comprises a third relay terminal 71P, a fourth relay terminal 72P, a first power supply terminal 73P, and a second power supply terminal 74P. When the third relay terminal 71P is electrically connected with one of the first relay terminal 63P and the second relay terminal 64P, the fourth relay terminal 72P is electrically connected with the other of the first relay terminal 63P and the second relay terminal 64P.SELECTED DRAWING: Figure 1

Description

The present invention relates to a flexible wiring board unit in which a plurality of flexible wiring boards are configured to be electrically connectable, and a light control unit equipped with the flexible wiring board unit.

The light control sheet includes two transparent electrode sheets and a light control layer sandwiched between the two transparent electrode sheets. Each transparent electrode sheet includes a light control layer and an electrode terminal exposed from the other transparent electrode sheet. The electrode terminal provided on each transparent electrode sheet is located at the edge provided on the light control sheet. One bonded terminal provided on a flexible wiring board is bonded to each electrode terminal (see, for example, Patent Documents 1 and 2). In the light control sheet, by applying a voltage between two transparent electrode sheets through a flexible wiring board, the light transmittance of the light control layer is changed compared to before the voltage is applied.

For example, as shown in FIG. 14, the light control sheet 100 is located between the first transparent electrode sheet 110, the second transparent electrode sheet 120, and between the first transparent electrode sheet 110 and the second transparent electrode sheet 120. and a light control layer. Note that in FIG. 14, the first transparent electrode sheet 110 is located on the front side of the paper with respect to the second transparent electrode sheet 120. Moreover, in FIG. 14, for convenience of explaining the shape of each sheet, the first transparent electrode sheet 110 is shown by thick lines, and the second transparent electrode sheet 120 is shown by thin lines.

The first transparent electrode sheet 110 includes a first terminal 110P, a part of which is exposed from the second transparent electrode sheet 120 and the light control layer, as shown by the broken line in FIG. Note that the first terminal 110P faces toward the back of the page in FIG. 14. The second transparent electrode sheet 120 includes a second terminal 120P, a portion of which is exposed from the first transparent electrode sheet 110 and the light control layer, as shown by dots in FIG. The second terminal 120P faces toward the front side of the page in FIG.

The light control sheet 100 includes one edge 100E extending along the first direction D1. The first terminal 110P and the second terminal 120P are arranged in parallel on the edge 100E. A cutout 100E1, which is a part of the edge 100E, is provided between the first terminal 110P and the second terminal 120P.

The light control sheet 100 is connected to an external power source 140 through a flexible wiring board 130. The flexible wiring board 130 is a flexible printed circuit (FPC). The flexible wiring board 130 includes a bonded part 131 and a lead-out part 132. The adhered portion 131 extends along the first direction D1. The pull-out portion 132 is pulled out from the center of the adhered portion 131 in the first direction D1 to the side opposite to the light control sheet 100 along the second direction D2 orthogonal to the first direction D1. The flexible wiring board 130 has a substantially T-shaped outer shape due to the adhered portion 131 and the drawn-out portion 132.

The bonded portion 131 includes a first bonded terminal 131P1 and a second bonded terminal 131P2. The first bonded terminal 131P1 and the second bonded terminal 131P2 are provided at each end of the bonded portion 131 in the first direction D1. The first adhered terminal 131P1 faces toward the front side of the page in FIG. The first adhered terminal 131P1 is electrically connected to the first terminal 110P. The second adhered terminal 131P2 faces toward the back of the page in FIG. 14. The second adhered terminal 131P2 is electrically connected to the second terminal 120P.

The drawer section 132 includes a first power terminal 132P1 and a second power terminal 132P2. The first power terminal 132P1 and the second power terminal 132P2 are each provided at the tip of the drawer portion 132 in the second direction D2. The first power terminal 132P1 and the second power terminal 132P2 face toward the front side of the paper in FIG. The first power terminal 132P1 is electrically connected to the first bonded terminal 131P1 inside the flexible wiring board 130. The second power terminal 132P2 is electrically connected to the second bonded terminal 131P2 inside the flexible wiring board 130. The first power terminal 132P1 and the second power terminal 132P2 are electrically connected to the external power source 140. The external power supply 140 applies a voltage between the first transparent electrode sheet 110 and the second transparent electrode sheet 120 via the flexible wiring board 130. This causes the light control layer to change the light transmittance.

Japanese Patent Application Publication No. 2007-57925 JP2020-38265A

In the flexible wiring board 130 , the position at which the lead-out portion 132 is pulled out from the adhered portion 131 is determined depending on the wiring route from the light control sheet 100 to the external power source 140 . If the positions at which the lead-out portions 132 are pulled out from the bonded portion 131 are different, even if the bonded portion 131 and the pull-out portion 132 have the same shape, the entire flexible wiring board 130 may be replaced with a new flexible wiring having a different shape. It is necessary to produce it as a substrate.

A flexible wiring board unit for solving the above problem includes a first flexible wiring board extending in a first direction, a first flexible wiring board extending in a second direction, and a first flexible wiring board extending in a second direction such that the second direction intersects the first direction. a second flexible wiring board connected to the first flexible wiring board, the first flexible wiring board having a first bonded terminal and a second bonded terminal arranged in the first direction. and, inside the first flexible wiring board, a plurality of first relay terminals electrically connected to the first bonded terminal, and a plurality of first relay terminals electrically connected to the second bonded terminal. a second relay terminal, in the first direction, the first relay terminal and the second relay terminal are arranged alternately at a constant pitch and in one row, and the second flexible wiring board comprises a third relay terminal and a fourth relay terminal located at one end in the second direction, and a first power terminal and a second power terminal located at the other end in the second direction, The terminal and the second power supply terminal are each connected to an external power supply, and when the third relay terminal is electrically connected to one of the first relay terminal and the second relay terminal, the fourth The fourth relay terminal is arranged with respect to the third relay terminal such that the relay terminal is electrically connected to the other of the first relay terminal and the second relay terminal.

A light control unit for solving the above problem includes a light control sheet having an edge extending in a first direction, and a flexible wiring board unit bonded to the edge. , the light control sheet includes a first transparent electrode sheet including a first electrode terminal, a second transparent electrode sheet including a second electrode terminal, and the first electrode terminal and the second electrode terminal are formed of a light control layer. the light control layer positioned between the first transparent electrode sheet and the second transparent electrode sheet so as to be exposed, the first electrode terminal and the second electrode terminal forming the edge portion. and arranged along the first direction, the flexible wiring board unit includes a first flexible wiring board extending in the first direction, and a first flexible wiring board extending in a second direction, the second direction being the first flexible wiring board unit. a second flexible wiring board connected to the first flexible wiring board so as to intersect with the first direction, the first flexible wiring board being connected to the first flexible wiring board arranged in the first direction; A terminal and a second bonded terminal, a plurality of first relay terminals that are electrically connected to the first bonded terminal inside the first flexible wiring board, and a plurality of first relay terminals that are electrically connected to the second bonded terminal. a plurality of second relay terminals that are electrically connected to each other, the first bonded terminal is bonded to the first electrode terminal in a conductive manner, and the second bonded terminal is connected to the second electrode terminal. The second flexible wiring board is electrically conductively bonded, the first relay terminals and the second relay terminals are arranged alternately at a constant pitch and in one row in the first direction, A third relay terminal and a fourth relay terminal located at one end in the second direction, and a first power supply terminal and a second power supply terminal located at the other end in the second direction, wherein the first power supply terminal and the The second power supply terminals are each connected to an external power supply, the third relay terminal is electrically connected to one of the first relay terminal and the second relay terminal, and the fourth relay terminal is connected to the first relay terminal. It is electrically connected to the other of the relay terminal and the second relay terminal.

According to each of the above configurations, the arrangement of the third relay terminal with respect to the first relay terminal and the arrangement of the fourth relay terminal with respect to the second relay terminal are determined at each pitch in which the first relay terminal and the second relay terminal are arranged alternately. can be changed to That is, in the first direction, the arrangement of the second flexible wiring board with respect to the first flexible wiring board can be changed for each pitch in which the first relay terminals and the second relay terminals are alternately arranged. By changing the arrangement of the second flexible wiring board with respect to the first flexible wiring board, a plurality of types of wiring routes can be realized with one flexible wiring board unit.

In the flexible wiring board unit, in the first flexible wiring board, the first relay terminal and the second relay terminal face the same direction, and in the second flexible wiring board, the first relay terminal and the second relay terminal face in the same direction. The third relay terminal and the fourth relay terminal may face the same direction.

According to the above configuration, the connection between the first relay terminal and the third relay terminal and the connection between the second relay terminal and the fourth relay terminal can be performed at one time. Therefore, the first flexible wiring board and the second flexible wiring board can be efficiently connected.

In the flexible wiring board unit, in the first flexible wiring board, the first bonded terminal faces the same direction as the first relay terminal and the second relay terminal, and the second bonded terminal faces the same direction as the first relay terminal and the second relay terminal, and The terminal faces in a direction opposite to the first relay terminal and the second relay terminal, and in the second flexible wiring board, the first power terminal and the second power terminal face the third relay terminal. and may face in the same direction as the fourth relay terminal.

According to the above configuration, even if the two bonded terminals provided on the first flexible wiring board are required to face opposite directions, the two relay terminals and The two power terminals can be arranged so as to face the same direction. Thereby, the configuration of the second flexible wiring board can be simplified, and as a result, it is also possible to improve the bending resistance and flexibility of the second flexible wiring board.

In the flexible wiring board unit, in the first flexible wiring board, the first relay terminal and the second relay terminal face opposite directions, and the first bonded terminal is The second bonded terminal faces the same direction as the second relay terminal, and the second bonded terminal faces the same direction as the second relay terminal, and the second bonded terminal faces the third relay terminal and the fourth relay terminal in the second flexible wiring board. The terminals may face in opposite directions.

According to the above structure, there is no need for a structure such as a through hole for electrically connecting terminals facing opposite directions inside the first flexible wiring board. The flexibility and bending resistance of the wiring board can be improved.

According to the present invention, in the flexible wiring board unit, the arrangement of the second flexible wiring board can be changed with respect to the first flexible wiring board.

FIG. 1 is a plan view of the light control unit of the first embodiment. FIG. 2 is a sectional view taken along line II-II in FIG. 1. FIG. 3 is a sectional view taken along line III--III in FIG. 1. FIG. 4 is a plan view of the first flexible wiring board of the first embodiment. FIG. 5 is a plan view of the second flexible wiring board of the first embodiment. FIG. 6 is a plan view of the first flexible wiring board of the second embodiment. FIG. 7 is a plan view of the first flexible wiring board of the third embodiment. FIG. 8 is a plan view of the first flexible wiring board of the third embodiment. FIG. 9 is a plan view of the first flexible wiring board of the fourth embodiment. FIG. 10 is a plan view of the first flexible wiring board of the fourth embodiment. FIG. 11 is a plan view of the first flexible wiring board of the fifth embodiment. FIG. 12 is a plan view of the first flexible wiring board of the fifth embodiment. FIG. 13 is a plan view of the second flexible wiring board of the fifth embodiment. FIG. 14 is a plan view showing a conventional light control sheet and flexible wiring board.

[First embodiment]
A first embodiment of the light control unit will be described below with reference to FIGS. 1 to 5.
As shown in FIG. 1, the light control unit 1 includes a light control sheet 10 and a flexible wiring board unit 50. The light control sheet 10 includes one edge 10E extending in the first direction D1. The flexible wiring board unit 50 is connected to the edge 10E of the light control sheet 10.

The light control sheet 10 includes a first transparent electrode sheet 20 and a second transparent electrode sheet 30. In FIG. 1, the first transparent electrode sheet 20 is located on the front side of the paper with respect to the second transparent electrode sheet 30. In FIG. 1, the second transparent electrode sheet 30 is located on the back side of the paper with respect to the first transparent electrode sheet 20. In addition, in FIG. 1, for convenience of explaining the relative positions of the first transparent electrode sheet 20 and the second transparent electrode sheet 30, the first transparent electrode sheet 20 is shown by a thick line, and the second transparent electrode sheet 30 is shown by a thick line. Indicated by a thin line.

The light control sheet 10 divides the space in which the light control sheet 10 is located into two. In FIG. 1, of the two spaces partitioned by the light control sheet 10, the space on the front side of the paper that is in contact with the first transparent electrode sheet 20 is the first space. In FIG. 1, of the two spaces partitioned by the light control sheet 10, the space on the back side of the plane of the paper that is in contact with the second transparent electrode sheet 30 is the second space.

The light control sheet 10 includes a first electrode terminal 22P and a second electrode terminal 32P. The first electrode terminal 22P is a portion of the light control sheet 10 where the first transparent electrode sheet 20 is exposed from the second transparent electrode sheet 30. The first electrode terminal 22P faces the second space (the back side of the paper in FIG. 1). The second electrode terminal 32P is a portion of the light control sheet 10 where the second transparent electrode sheet 30 is exposed from the first transparent electrode sheet 20. The second electrode terminal 32P faces the first space (the front side of the paper in FIG. 1). The first electrode terminal 22P and the second electrode terminal 32P are lined up at a distance along the first direction D1. In addition, in FIG. 1, the first electrode terminal 22P is surrounded by a broken line, and the second electrode terminal 32P is marked with a dot.

The edge 10E includes a notch 10A. The notch 10A is a depression in which a part of the edge 10E is recessed toward the inside of the light control sheet 10 from the edge 10E. The notch 10A is located between the first electrode terminal 22P and the second electrode terminal 32P at the edge 10E.

The flexible wiring board unit 50 includes a first flexible wiring board 60 extending in a first direction D1, and a second flexible wiring board 70 extending in a second direction D2 intersecting the first direction D1. The second direction D2 is, for example, a direction orthogonal to the first direction D1. The first flexible wiring board 60 is responsible for electrical connection with the light control sheet 10, which is an example of a power supply target, in the flexible wiring board unit 50. The second flexible wiring board 70 is responsible for electrical connection with the external power supply 1A in the flexible wiring board unit 50.

The first flexible wiring board 60 and the second flexible wiring board 70 are each one flexible printed circuit board (FPC). The first flexible wiring board 60 includes a first bonded terminal 61P and a second bonded terminal 62P. The first bonded terminal 61P and the second bonded terminal 62P are lined up along the first direction D1 in the first flexible wiring board 60. The first adhered terminal 61P is located at one end of the first flexible wiring board 60 in the first direction D1. The second adhered terminal 62P is located at the other end of the first flexible wiring board 60 in the first direction D1.

The first adhered terminal 61P is located on the second space side (the back side of the paper in FIG. 1) with respect to the first electrode terminal 22P, and faces the first space side (the front side of the paper in FIG. 1). do. The first bonded terminal 61P includes, for example, a plurality of tooth terminals arranged in a comb-teeth shape at a predetermined pitch along the first direction D1. The first bonded terminal 61P faces the first electrode terminal 22P and is bonded so as to be electrically connected to the first electrode terminal 22P.

The second bonded terminal 62P is located on the first space side (the front side of the paper in FIG. 1) with respect to the second electrode terminal 32P, and faces the second space side (the back side of the paper in FIG. 1). do. The second bonded terminal 62P includes, for example, a plurality of tooth terminals arranged in a comb-teeth shape at a predetermined pitch along the first direction D1. The second bonded terminal 62P is bonded so as to be electrically connected to the second electrode terminal 32P while facing the second electrode terminal 32P.

The first flexible wiring board 60 includes a plurality of first relay terminals 63P and a plurality of second relay terminals 64P. In the plurality of first relay terminals 63P and the plurality of second relay terminals 64P, the first relay terminals 63P and the second relay terminals 64P are arranged alternately in a line along the first direction D1. The first relay terminal 63P and the second relay terminal 64P face the first space side (the front side of the paper in FIG. 1).

Each of the first relay terminals 63P and each of the second relay terminals 64P includes a plurality of tooth terminals arranged in a comb-teeth shape at a constant pitch along the first direction D1. Each first relay terminal 63P and each second relay terminal 64P have the same number of tooth terminals and have the same pitch. Note that, as an example, the number of first relay terminals 63P is the same as the number of second relay terminals 64P, but the number may be greater than the number of second relay terminals 64P, or may be less than the number of second relay terminals 64P.

Each first relay terminal 63P is electrically connected to a first adhered terminal 61P inside the first flexible wiring board 60. Each second relay terminal 64P is electrically connected to the second bonded terminal 62P via a plurality of through holes 65 inside the first flexible wiring board 60.

The second flexible wiring board 70 is mechanically and electrically connected to the first flexible wiring board 60 at one end in the second direction D2. The second flexible wiring board 70 extends from the connection portion with the first flexible wiring board 60 along the second direction D2 to the opposite side to the light control sheet 10. As an example, the flexible wiring board unit 50 has a substantially T-shaped outer shape due to the first flexible wiring board 60 and the second flexible wiring board 70.

The second flexible wiring board 70 includes a third relay terminal 71P and a fourth relay terminal 72P. The third relay terminal 71P and the fourth relay terminal 72P are located at one end of the second flexible wiring board 70 in the second direction D2. The third relay terminal 71P and the fourth relay terminal 72P are lined up along the first direction D1. The third relay terminal 71P and the fourth relay terminal 72P face the second space side (the back side of the paper in FIG. 1).

The third relay terminal 71P and the fourth relay terminal 72P include a plurality of tooth terminals arranged in a comb-teeth shape at a constant pitch along the first direction D1. The third relay terminal 71P and the fourth relay terminal 72P have the same number of tooth terminals and have the same pitch. Further, the third relay terminal 71P and the fourth relay terminal 72P have the same number of tooth terminals as the tooth terminals of each of the first relay terminals 63P and each of the second relay terminals 64P, and have the same pitch.

The third relay terminal 71P and the fourth relay terminal 72P are connected to the adjacent first relay terminal 63P and second relay terminal 64P among the plurality of first relay terminals 63P and the plurality of second relay terminals 64P arranged in a row. be done. Thereby, the first flexible wiring board 60 and the second flexible wiring board 70 are mechanically and electrically connected.

The second flexible wiring board 70 includes a first power terminal 73P and a second power terminal 74P. The first power terminal 73P and the second power terminal 74P are located at an end opposite to the end where the third relay terminal 71P and the fourth relay terminal 72P are located in the second direction D2. The first power supply terminal 73P and the second power supply terminal 74P are each connected to the external power supply 1A. The external power supply 1A applies a voltage between the first transparent electrode sheet 20 and the second transparent electrode sheet 30 via the flexible wiring board unit 50. Thereby, the light control sheet 10 changes the light transmittance. The light control sheet 10 is an example of a power supply target to which the external power supply 1A supplies power via the flexible wiring board unit 50.

[Cross-sectional structure of light control unit]
As shown in FIGS. 2 and 3, the light control sheet 10 includes a first transparent electrode sheet 20, a second transparent electrode sheet 30, and a light control layer 40. The first transparent electrode sheet 20 includes a first transparent base material 21 and a first transparent electrode layer 22. The second transparent electrode sheet 30 includes a second transparent base material 31 and a second transparent electrode layer 32. The light control layer 40 is located between the first transparent electrode layer 22 and the second transparent electrode layer 32. In the light control sheet 10, a first transparent base material 21, a first transparent electrode layer 22, a light control layer 40, a second transparent electrode layer 32, and a second transparent base material 31 are laminated in this order.

The first transparent base material 21 and the second transparent base material 31 each have a light transmittance that transmits visible light and an electrical insulation property. The materials constituting the first transparent base material 21 and the second transparent base material 31 are each an organic polymer compound or an inorganic polymer compound. An example of the organic polymer compound is at least one selected from the group consisting of polyester, polyacrylate, polycarbonate, and polyolefin. An example of the inorganic polymer compound is at least one selected from the group consisting of silicon dioxide, silicon oxynitride, and silicon nitride.

The first transparent electrode layer 22 and the second transparent electrode layer 32 each have optical transparency to transmit visible light and electrical conductivity. Examples of materials constituting the first transparent electrode layer 22 and the second transparent electrode layer 32 include indium tin oxide, fluorine-doped tin oxide, tin oxide, zinc oxide, carbon nanotubes, and poly 3,4-ethylenedioxythiophene, respectively. At least one selected from the group consisting of:

The light control layer 40 changes the light transmittance after the voltage is applied from the light transmittance before the voltage is applied by applying a voltage through the first transparent electrode layer 22 and the second transparent electrode layer 32 . An example of the light control layer 40 includes a transparent organic polymer layer and a liquid crystal composition. The transparent organic polymer layer defines a gap between the first transparent electrode layer 22 and the second transparent electrode layer 32 that is filled with a liquid crystal composition. The liquid crystal composition fills the voids in the transparent organic polymer layer. The liquid crystal composition includes a liquid crystal compound. Examples of liquid crystal compounds include Schiff base compounds, azo compounds, azoxy compounds, biphenyl compounds, terphenyl compounds, benzoic acid ester compounds, tolan compounds, pyrimidine compounds, cyclohexanecarboxylic acid ester compounds, and phenyl compounds. At least one selected from the group consisting of cyclohexane compounds and dioxane compounds.

An example of the holding type of the liquid crystal composition in the light control layer 40 is any one selected from the group consisting of a polymer network type, a polymer dispersion type, and a capsule type. The polymer network type has a transparent polymer network having a three-dimensional network shape, and holds the liquid crystal composition in the interconnected network voids. A polymer network is an example of a transparent organic polymer layer. The polymer dispersed type has a large number of isolated voids in a transparent organic polymer layer, and holds a liquid crystal composition in the voids dispersed in the polymer layer. The capsule type holds a capsule-shaped liquid crystal composition in a transparent organic polymer layer. In addition, the liquid crystal composition may contain, in addition to the above-mentioned liquid crystal compound, a monomer for forming a transparent organic polymer layer and a dichroic dye.

The first flexible wiring board 60 includes a first outer insulating layer 60A, a second outer insulating layer 60B, an inner insulating layer 60C, a first conductor layer 60D, and a second conductor layer 60E (see FIG. 3). The inner insulating layer 60C is located between the first outer insulating layer 60A and the second outer insulating layer 60B. The first outer insulating layer 60A is located on the side of the first space defined by the light control sheet 10 with respect to the inner insulating layer 60C. The second outer insulating layer 60B is located on the side of the second space defined by the light control sheet 10 with respect to the inner insulating layer 60C. The first outer insulating layer 60A, the second outer insulating layer 60B, and the inner insulating layer 60C are insulating resin films, and are made of polyimide, for example.

The first conductor layer 60D is located between the first outer insulating layer 60A and the inner insulating layer 60C. The second conductor layer 60E is located between the second outer insulating layer 60B and the inner insulating layer 60C. The first conductor layer 60D and the second conductor layer 60E are electrically conductive metal films, and are made of copper foil, for example. Note that the second conductor layer 60E is not arranged in the cross section shown in FIG. Further, the first conductor layer 60D shown in FIG. 2 is electrically insulated from the first conductor layer 60D shown in FIG. 3.

As shown in FIG. 2, the first electrode terminal 22P is a portion of the light control sheet 10 where the first transparent electrode layer 22 is exposed from the second transparent electrode sheet 30 and the light control layer 40. Further, the first adhered terminal 61P and the first relay terminal 63P are the portions of the first flexible wiring board 60 where the first conductor layer 60D is exposed from the first outer insulating layer 60A. The first adhered terminal 61P is electrically connected to the first relay terminal 63P via the first conductor layer 60D inside the first flexible wiring board 60.

A first bonded terminal 61P is electrically bonded to the first electrode terminal 22P via a first conductive adhesive 61A. The first conductive adhesive 61A is, for example, an anisotropic conductive film (ACF), an anisotropic conductive paste (ACP), an isotropic conductive film (ICF), and isotropic conductive paste (ICP).

A first sealing portion 61B for covering the end face of the light control layer 40 is provided on the first electrode terminal 22P. The first sealing portion 61B is made of insulating resin. The first sealing portion 61B is made of, for example, epoxy resin or acrylic resin. The first sealing portion 61B is in close contact with the first electrode terminal 22P, and is also in close contact with the end face of the second transparent electrode sheet 30 and the end face of the light control layer 40.

As shown in FIG. 3, the second electrode terminal 32P is a portion of the light control sheet 10 where the second transparent electrode layer 32 is exposed from the first transparent electrode sheet 20 and the light control layer 40. Further, the second adhered terminal 62P is a portion of the first flexible wiring board 60 where the second conductor layer 60E is exposed from the second outer insulating layer 60B. The second relay terminal 64P is a portion of the first flexible wiring board 60 where the first conductor layer 60D is exposed from the first outer insulating layer 60A. The second conductor layer 60E that constitutes the second adhered terminal 62P and the first conductor layer 60D that constitutes the second relay terminal 64P are electrically connected via the through hole 65.

A second bonded terminal 62P of the first flexible wiring board 60 is electrically bonded to the second electrode terminal 32P via a second conductive adhesive 62A. The second conductive adhesive 62A is made of, for example, the same kind of material as the first conductive adhesive 61A.

A second sealing portion 62B for covering the end face of the light control layer 40 is provided on the second electrode terminal 32P. The second sealing portion 62B is made of an insulating resin, and is made of, for example, epoxy resin or acrylic resin. The second sealing portion 62B is in close contact with the second electrode terminal 32P, and is also in close contact with the end face of the first transparent electrode sheet 20 and the end face of the light control layer 40. The first sealing part 61B and the second sealing part 62B prevent the liquid crystal composition constituting the light control layer 40 from leaking to the outside by covering the end face of the light control layer 40, and also prevent the liquid crystal composition from leaking to the outside. Prevents deterioration caused by acids, moisture, ultraviolet rays, etc.

[First flexible wiring board]
As shown in FIG. 4, the first conductor layer 60D includes a first portion 60D1 and a second portion 60D2. The first portion 60D1 constitutes the first bonded terminal 61P and the first relay terminal 63P in the first conductor layer 60D, and connects the first bonded terminal 61P and each first relay terminal 63P. In the first portion 60D1, the first bonded terminal 61P is located at one end in the second direction D2, and each first relay terminal 63P is located at the other end in the second direction D2. The first conductor layer 60D extends in the second direction D2 from the first adhered terminal 61P toward each first relay terminal 63P.

The second portion 60D2 constitutes the second adhered terminal 62P of the first conductor layer 60D. One end of the second portion 60D2 overlaps with the second conductor layer 60E via the inner insulating layer 60C and is connected to the second conductor layer 60E via a plurality of through holes 65. The plurality of through holes 65 are located at the end of the first flexible wiring board 60 on the second bonded terminal 62P side in the first direction D1, and are connected to the second bonded terminal 62P and each of the second bonded terminals 62P in the second direction D2. 2 relay terminal 64P. Note that the number of through holes 65 may be determined according to the magnitude of the current flowing through the second portion 60D2 and the second conductor layer 60E, and for example, it may be one, or may be two or more. Good too.

The second portion 60D2 and the second conductor layer 60E overlap with each other with the inner insulating layer 60C interposed therebetween, and in the portion where the plurality of through holes 65 are provided, the first conductor layer 60D and the second conductor layer 60E are electrically This is an example of an interlayer connection portion 65A that is connected to each other. For example, the interlayer connection portion 65A is located between the second bonded terminal 62P and each second relay terminal 64P in the second direction D2. In the first direction D1, the interlayer connection portion 65A is located offset from the center of the first flexible wiring board 60 toward the second bonded terminal 62P. Further, in the first direction D1, the width of the interlayer connection portion 65A is narrower than the width of the second bonded terminal 62P.

Since the interlayer connection portion 65A is a portion including the through hole 65, it is a portion having relatively poor flexibility and low bending resistance compared to other portions of the first flexible wiring board 60. In a plan view from a viewpoint facing the first flexible wiring board 60, the flexibility of the first flexible wiring board 60 as a whole can be increased by reducing the area of the interlayer connection part 65A as in the first embodiment. And it is possible to suppress a decrease in bending resistance. In other words, when viewed in plan from a viewpoint facing the first flexible wiring board 60, by arranging the plurality of through holes 65 in one place in a narrow area, the first flexible wiring board 60 as a whole can be suppressed from deteriorating in flexibility and bending resistance. In particular, in the first direction D1, the width of the interlayer connection portion 65A is made smaller than the width of the second bonded terminal 62P, and the interlayer connection portion 65A is biased toward the second bonded terminal 62P. Therefore, it is possible to suppress a decrease in bending resistance against bending in the direction along the first direction D1.

The second portion 60D2 extends from the interlayer connection portion 65A toward the end of the first flexible wiring board 60 opposite to the second bonded terminal 62P along the second direction D2. The second portion 60D2 extends between the side edge of the first flexible wiring board 60 on the second bonded terminal 62P side extending along the second direction D2 and the second relay terminal 64P closest to the side edge. pass. The second portion 60D2 is arranged in the first direction D1 between the side edge of the first flexible wiring board 60 opposite to the second adhered terminal 62P extending along the first direction D1 and each second relay terminal 64P. , and extends toward the second bonded terminal 62P to constitute each second relay terminal 64P.

The plurality of first relay terminals 63P and the plurality of second relay terminals 64P are arranged alternately at a constant pitch P1 along the first direction D1. The first flexible wiring board 60 has a width W1 along the second direction D2. The first relay terminal 63P has a comb-like tooth terminal whose tip extends toward the opposite side from the first bonded terminal 61P. The second relay terminal 64P has a comb-shaped tooth terminal whose tip extends toward the second bonded terminal 62P.

Each first relay terminal 63P and each second relay terminal 64P includes a reference portion 66. As an example, one reference portion 66 is provided at both ends of each first relay terminal 63P and each second relay terminal 64P in the first direction D1. The reference portion 66 is, for example, a cross-shaped convex portion. The reference portion 66 appropriately arranges the terminals when connecting either the third relay terminal 71P or the fourth relay terminal 72P to either the first relay terminal 63P or the second relay terminal 64P. serve as a standard for

[Second flexible wiring board]
Next, the second flexible wiring board 70 will be explained with reference to FIG. Note that FIG. 5 shows the second flexible wiring board 70 in a state in which the front and back sides are reversed from the state shown in FIG.

As shown in FIG. 5, the second flexible wiring board 70 includes a third outer insulating layer 70A, a fourth outer insulating layer 70B, and a conductor layer 70C. The conductor layer 70C is located between the third outer insulating layer 70A and the fourth outer insulating layer 70B. The third outer insulating layer 70A is located on the first space side (the back side of the paper in FIG. 6) with respect to the conductor layer 70C. The fourth outer insulating layer 70B is located on the second space side (on the front side of the paper in FIG. 6) with respect to the conductor layer 70C. The third outer insulating layer 70A and the fourth outer insulating layer 70B are insulating resin films, and are made of polyimide, for example. The conductor layer 70C is a conductive metal film, and is made of copper foil, for example.

The third relay terminal 71P, the fourth relay terminal 72P, the first power terminal 73P, and the second power terminal 74P of the second flexible wiring board 70 are connected to the conductor layer in the second flexible wiring board 70. 70C is a portion exposed from the fourth outer insulating layer 70B. The conductor layer 70C electrically connects the third relay terminal 71P and the first power terminal 73P inside the second flexible wiring board 70, and also connects the fourth relay terminal 72P and the second power terminal 74P. Connect electrically. Note that in the conductor layer 70C, a portion connecting the third relay terminal 71P and the first power terminal 73P is electrically insulated from a portion connecting the fourth relay terminal 72P and the second power terminal 74P. ing. Further, in the first direction D1, the pitch P2 from the center of the third relay terminal 71P to the center of the fourth relay terminal 72P is, for example, the same as the pitch P1 where the first relay terminal 63P and the second relay terminal 64P are lined up. It is.

The third relay terminal 71P and the fourth relay terminal 72P each include a positioning portion 75. As an example, one positioning section 75 is provided at both ends of each of the third relay terminal 71P and the fourth relay terminal 72P in the first direction D1. The positioning portion 75 is, for example, a cross-shaped recess.

The positioning part 75, together with the reference part 66, connects the terminals when connecting either the third relay terminal 71P or the fourth relay terminal 72P to either the first relay terminal 63P or the second relay terminal 64P. This serves as a reference for proper placement. For example, when the third relay terminal 71P is connected to the first relay terminal 63P, when the convex shape of the reference part 66 is arranged inside the concave shape of the positioning part 75, the third relay terminal 71P is connected to the first relay terminal 63P. The structure is such that the third relay terminal 71P is appropriately arranged. That is, in a plane including the first direction D1 and the second direction D2, each of the third relay terminal 71P and the fourth relay terminal 72P is connected to the first relay terminal based on the arrangement of the positioning part 75 with respect to the reference part 66. 63P or the second relay terminal 64P.

The first flexible wiring board 60 has three insulating layers 60A to 60C and two conductive layers 60D and 60E, so that the second bonded terminal 62P, the first bonded terminal 61P, the first relay terminal 63P, and is configured to face the opposite direction to the second relay terminal 64P. On the other hand, the second flexible wiring board 70 has two insulating layers 70A, 70B and one conductor layer 70C, so that the third relay terminal 71P, the fourth relay terminal 72P, the first power supply terminal 73P, and the The two power supply terminals 74P are configured to face in the same direction. With such a configuration, even if the first bonded terminal 61P and the second bonded terminal 62P are required to face in opposite directions, the layer structure of the second flexible wiring board 70 can be changed. It can be simplified. As a result, it becomes possible to improve the bending resistance and flexibility of the second flexible wiring board 70 as the number of constituent layers is reduced.

[Connection between the first flexible wiring board and the second flexible wiring board]
The third relay terminal 71P is one of the first relay terminal 63P and the second relay terminal 64P, and is connected to any one of the plurality of first relay terminals 63P and the plurality of second relay terminals 64P. be done. The fourth relay terminal 72P is the other of the first relay terminal 63P and the second relay terminal 64P, and the third relay terminal 71P is the other of the plurality of first relay terminals 63P and the plurality of second relay terminals 64P. It is connected to the relay terminal located next to the connected relay terminal.

For example, when the third relay terminal 71P is connected to the first relay terminal 63P, the fourth relay terminal 72P is connected to the second relay terminal 64P located next to the first relay terminal 63P to which the third relay terminal 71P is connected. connected to. For example, when the third relay terminal 71P is connected to the second relay terminal 64P, the fourth relay terminal 72P is connected to the first relay terminal 63P located next to the second relay terminal 64P to which the third relay terminal 71P is connected. connected to.

That is, when the third relay terminal 71P is electrically connected to one of the first relay terminal 63P and the second relay terminal 64P, the fourth relay terminal 72P is connected to the first relay terminal 63P and the second relay terminal 64P. electrically connected to the other one. In the second flexible wiring board 70, the fourth relay terminal is connected to the third relay terminal 71P in a plane including the first direction D1 and the second direction D2 so that the above connection is possible. 72P is placed.

The flexible wiring board unit 50 can change the arrangement of the third relay terminal 71P and the fourth relay terminal 72P with respect to the terminal row formed by the plurality of first relay terminals 63P and the plurality of second relay terminals 64P. . Thereby, the flexible wiring board unit 50 can change the arrangement of the second flexible wiring board 70 with respect to the first flexible wiring board 60 at every pitch P1 in the first direction D1.

The connection between the first relay terminal 63P and the second relay terminal 64P and the third relay terminal 71P and the fourth relay terminal 72P can be made using an anisotropic conductive film, an anisotropic conductive paste, an isotropic conductive film, for example. An adhesive consisting of at least one selected from the group consisting of , and isotropic conductive paste is used.

The first flexible wiring board 60 and the second flexible wiring board 70 are connected to any one of the plurality of first relay terminals 63P and the plurality of second relay terminals 64P, and the third relay terminal 71P and the fourth relay terminal 72P. It is constructed integrally by connecting the two. The first relay terminal 63P and the second relay terminal 64P face the same direction, and the third relay terminal 71P and the fourth relay terminal 72P face the same direction. Therefore, one of the first relay terminal 63P and the second relay terminal 64P and the third relay terminal 71P are connected, and the other of the first relay terminal 63P and the second relay terminal 64P and the fourth relay terminal 72P are connected. connection can be made at once.

Note that the first relay terminal 63P and the second relay terminal 64P, which are not connected to either the third relay terminal 71P or the fourth relay terminal 72P, are sealed by, for example, applying and curing an insulating resin paste. be done.

Next, the circuit configuration of the flexible wiring board unit 50 will be explained. First, a case will be described in which the third relay terminal 71P is connected to the first relay terminal 63P and the fourth relay terminal 72P is connected to the second relay terminal 64P. In this case, the first adhered terminal 61P is electrically connected to the external power supply 1A via the first relay terminal 63P, the third relay terminal 71P, and the first power supply terminal 73P. The second adhered terminal 62P is electrically connected to the external power source 1A via a second relay terminal 64P, a fourth relay terminal 72P, and a second power supply terminal 74P.

Next, a case will be described in which the third relay terminal 71P is connected to the second relay terminal 64P and the fourth relay terminal 72P is connected to the first relay terminal 63P. In this case, the first adhered terminal 61P is electrically connected to the external power supply 1A via the first relay terminal 63P, the fourth relay terminal 72P, and the second power supply terminal 74P. The second adhered terminal 62P is electrically connected to the external power supply 1A via the second relay terminal 64P, the third relay terminal 71P, and the first power supply terminal 73P.

[Effects of the first embodiment]
According to the first embodiment, the following effects can be obtained.
(1-1) The flexible wiring board unit 50 can change the arrangement of the second flexible wiring board 70 with respect to the first flexible wiring board 60 at every pitch P1 in the first direction D1. Therefore, by changing the arrangement of the second flexible wiring board 70 with respect to the first flexible wiring board 60, a plurality of types of wiring routes can be realized.

(1-2) In the first flexible wiring board 60, the first relay terminal 63P and the second relay terminal 64P face the same direction, and in the second flexible wiring board 70, the third The relay terminal 71P and the fourth relay terminal 72P face the same direction. Thereby, one of the first relay terminal 63P and the second relay terminal 64P and the third relay terminal 71P are connected, and the other of the first relay terminal 63P and the second relay terminal 64P and the fourth relay terminal 72P can be connected at once. Therefore, the first flexible wiring board 60 and the second flexible wiring board 70 can be efficiently connected.

(1-3) In the first flexible wiring board 60, the second bonded terminal 62P faces the opposite direction to the first bonded terminal 61P, the first relay terminal 63P, and the second relay terminal 64P. Further, in the second flexible wiring board 70, the third relay terminal 71P, the fourth relay terminal 72P, the first power terminal 73P, and the second power terminal 74P face the same direction. With such a configuration, the layer structure of the second flexible wiring board 70 is simplified even when the first bonded terminal 61P and the second bonded terminal 62P are required to face in opposite directions. be able to. As a result, it becomes possible to improve the bending resistance and flexibility of the second flexible wiring board 70.

(1-4) In the first direction D1, the width of the interlayer connection portion 65A is made smaller than the width of the second bonded terminal 62P, and the interlayer connection portion 65A is made smaller than the center of the first flexible wiring board 60. It is biased toward the second bonded terminal 62P. Thereby, it is possible to suppress a decrease in the bending resistance of the first flexible wiring board 60 against bending in the direction along the first direction D1.

(1-5) A reference portion 66 is provided at each first relay terminal 63P and each second relay terminal 64P. Thereby, even if each of the third relay terminal 71P and the fourth relay terminal 72P is connected to which first relay terminal 63P or second relay terminal 64P, the positioning portion 75 is arranged with respect to the reference portion 66. Based on this, two relay terminals to be connected can be appropriately arranged.

[Second embodiment]
Next, a second embodiment of the light control unit 1 will be described with reference to FIG. 6. Note that the light control unit 1 of the second embodiment includes a first flexible wiring board 80 having a configuration different from that of the first flexible wiring board 60 instead of the first flexible wiring board 60. It has the same configuration as the first embodiment except for this point. Therefore, in the following, while the configuration of the first flexible wiring board 80 in the second embodiment will be described in detail, description of other configurations will be omitted.

As shown in FIG. 6, like the first flexible wiring board 60, the first flexible wiring board 80 includes a first bonded terminal 61P, a second bonded terminal 62P, and a plurality of first relay terminals 63P. , and a plurality of second relay terminals 64P. The first adhered terminal 61P, the first relay terminal 63P, and the second relay terminal 64P are constituted by the first conductor layer 60D. The second adhered terminal 62P is constituted by the second conductor layer 60E.

A second conductor layer 60E is connected via a plurality of through holes 65 to the first portion 60D1 that connects the first adhered terminal 61P and the first relay terminal 63P. That is, between the first adhered terminal 61P and the first relay terminal 63P, there is an interlayer connection portion in which the first conductor layer 60D and the second conductor layer 60E are electrically connected via the plurality of through holes 65. 65A is provided. In addition, in FIG. 6, the interlayer connection portion 65A is shown with dots.

The interlayer connection portion 65A located between the first adhered terminal 61P and the first relay terminal 63P moves from the position of one end of the terminal row constituted by the plurality of first relay terminals 63P to the other end in the first direction D1. It extends to the location. The interlayer connection portion 65A located between the first adhered terminal 61P and the first relay terminal 63P is provided with one or more through holes 65, for example, at least at a position adjacent to each first relay terminal 63P.

In the first portion 60D1 that connects the first bonded terminal 61P and the first relay terminal 63P, the width along the second direction D2 of the portion configured as the interlayer connection portion 65A is such that the portion is only the first conductor layer 60D. Width smaller than the configured width.

The second conductor layer 60E constituting the second adhered terminal 62P and the second portion 60D2 constituting the second relay terminal 64P have a plurality of through holes in a portion other than the second adhered terminal 62P and the second relay terminal 64P. It is electrically connected via 65. That is, between the second adhered terminal 62P and the second relay terminal 64P, there is an interlayer connection part in which the first conductor layer 60D and the second conductor layer 60E are electrically connected via the plurality of through holes 65. 65A is provided. The interlayer connection portion 65A that connects the second adhered terminal 62P and the second relay terminal 64P is provided with one or more through holes 65, for example, at least at a position adjacent to each first relay terminal 63P.

Width along the second direction D2 of a portion located on the opposite side of the second adhered terminal 62P with respect to the second relay terminal 64P in the interlayer connection portion 65A that connects the second adhered terminal 62P and the second relay terminal 64P. is smaller than the width when the portion is composed only of the first conductor layer 60D.

The first flexible wiring board 80 connects the first bonded terminal 61P and the first relay terminal 63P and the second bonded terminal 62P and the second relay terminal 64P by an interlayer connection portion 65A. There is. In the interlayer connection portion 65A, the current branches and flows into the first conductor layer 60D and the second conductor layer 60E. Therefore, even if the width of the interlayer connection portion 65A in the second direction D2 is reduced, heat generation due to energization is less likely to occur.

In other words, by connecting the first bonded terminal 61P and the first relay terminal 63P with the interlayer connection portion 65A, the first bonded terminal 61P and the first relay terminal 63P can be The width W2 along the two directions D2 can be made smaller than the width W1 of the first flexible wiring board 60. Similarly, by connecting the second bonded terminal 62P and the second relay terminal 64P with the interlayer connection portion 65A, the width W2 of the first flexible wiring board 80 can be reduced to a 1. The width W1 of the flexible wiring board 60 can be made smaller than the width W1 of the flexible wiring board 60.

Note that the interlayer connection portion 65A between the second bonded terminal 62P and the second relay terminal 64P may be provided at least at a position opposite to the second bonded terminal 62P with respect to the second relay terminal 64P. . The interlayer connection portion 65A may extend along the first direction D1 from the position of one end of the terminal row constituted by the plurality of second relay terminals 64P to the position of the other end.

[Effects of second embodiment]
According to the second embodiment, the following effects can be obtained.
(2-1) By connecting the first bonded terminal 61P and the first relay terminal 63P with the interlayer connection portion 65A, the first flexible wiring board 80 can suppress an increase in the amount of heat generated due to energization. The width W2 of the first flexible wiring board 60 can be made smaller than the width W1 of the first flexible wiring board 60. Similarly, by connecting the second bonded terminal 62P and the second relay terminal 64P with the interlayer connection portion 65A, the width W2 of the first flexible wiring board 80 can be reduced to a 1. The width W1 of the flexible wiring board 60 can be made smaller than the width W1 of the flexible wiring board 60. Thereby, in a state where the flexible wiring board unit 50 is connected to the light control sheet 10, the length by which the first flexible wiring board 80 protrudes from the light control sheet 10 can be shortened. Furthermore, even with the flexible wiring board unit 50 including the first flexible wiring board 80, effects similar to the above (1-1) to (1-3) and (1-5) can be obtained. I can do it.

[Third embodiment]
Next, a third embodiment of the light control unit 1 will be described with reference to FIGS. 7 and 8. Note that the light control unit 1 of the third embodiment includes a first flexible wiring board 81 having a configuration different from that of the first flexible wiring board 60 instead of the first flexible wiring board 60. It has the same configuration as the first embodiment except for this point. Therefore, in the following, while the configuration of the first flexible wiring board 81 in the third embodiment will be described in detail, description of other configurations will be omitted.

As shown in FIG. 7, the first flexible wiring board 81, like the first flexible wiring board 60, includes a first bonded terminal 61P, a second bonded terminal 62P, and a plurality of first relay terminals 63P. , and a plurality of second relay terminals 64P. Note that the first relay terminal 63P and the second relay terminal 64P are located at ends of the first flexible wiring board 81 opposite to the first bonded terminal 61P and the second bonded terminal 62P in the second direction D2. located in the department. Further, the tips of the first relay terminal 63P and the second relay terminal 64P each have comb-shaped tooth terminals that extend toward the opposite side from the first bonded terminal 61P and the second bonded terminal 62P.

The first adhered terminal 61P, the first relay terminal 63P, and the second relay terminal 64P are constituted by the first conductor layer 60D. The second adhered terminal 62P is constituted by the second conductor layer 60E. In addition, in FIG. 7, the outline of the portion of the first conductor layer 60D that overlaps with the first outer insulating layer 60A is shown with a broken line.

The first portion 60D1 connecting the first bonded terminal 61P and the first relay terminal 63P has the first bonded terminal 61P located at one end in the second direction D2, and each first bonded terminal 60D1 at the other end in the second direction D2. A relay terminal 63P is located there. The first conductor layer 60D extends in the second direction D2 from the first adhered terminal 61P toward each first relay terminal 63P.

The second portion 60D2 forming the second relay terminal 64P forms each second relay terminal 64P discontinuously. In other words, the second portions 60D2 are provided in the same number as the plurality of second relay terminals 64P. Each second portion 60D2 extends from the second relay terminal 64P toward the second bonded terminal 62P along the second direction D2.

As shown in FIG. 8, in the second conductor layer 60E constituting the second adhered terminal 62P, the second adhered terminal 62P is located at one end in the second direction D2, and the other end in the second direction D2 is located at the second conductor layer 60E. It overlaps with each second portion 60D2 constituting the second relay terminal 64P. In addition, in FIG. 8, the outline of the second conductor layer 60E is shown with a broken line.

A portion where the second conductor layer 60E and each second portion 60D2 overlap is electrically connected to the second conductor layer 60E and each second portion 60D2 via a plurality of through holes 65, and is configured as an interlayer connection portion 65A. be done. That is, in the first flexible wiring board 81, an interlayer connection portion 65A is provided for each second relay terminal 64P. In the first flexible wiring board 81, the second relay terminal 64P and the interlayer connection portion 65A are connected to the second bonded terminal 65A such that the interlayer connection portion 65A is located on the second bonded terminal 62P side with respect to the second relay terminal 64P. They are arranged in parallel along the direction D2.

A portion of the second conductor layer 60E that connects the second bonded terminal 62P and each interlayer connection portion 65A connects the first bonded terminal 61P of the first portion 60D1 with each first relay via the inner insulating layer 60C. It overlaps with the part connecting with the terminal 63P. The second conductor layer 60E and second portion 60D2 that connect the second bonded terminal 62P and each second relay terminal 64P are arranged between the second bonded terminal 62P and each second relay terminal 64P in the second direction D2. Located in

According to the arrangement of the first conductor layer 60D and the second conductor layer 60E as described above, the first relay terminal 63P and the second relay terminal 64P are arranged in the second direction D2 in the first flexible wiring board 81. Can be placed at one end. In this case, compared to the first flexible wiring board 60 of the first embodiment, the wiring path connecting the second bonded terminal 62P and each second relay terminal 64P can be shortened. As a result, the width W3 of the first flexible wiring board 81 along the second direction D2 can be made smaller than the width W1 of the first flexible wiring board 60.

[Effects of third embodiment]
According to the third embodiment, the following effects can be obtained.
(3-1) By providing the interlayer connection portion 65A for each second relay terminal 64P, the width W3 of the first flexible wiring board 81 along the second direction D2 is changed from the width W1 of the first flexible wiring board 60. It can be made smaller than. As a result, when the flexible wiring board unit 50 is connected to the light control sheet 10, the length by which the first flexible wiring board 81 protrudes from the light control sheet 10 can be reduced. Furthermore, even with the flexible wiring board unit 50 including the first flexible wiring board 81, effects similar to the above (1-1) to (1-3) and (1-5) can be obtained. I can do it.

[Fourth embodiment]
Next, a fourth embodiment of the light control unit 1 will be described with reference to FIGS. 9 and 10. Note that the light control unit 1 of the fourth embodiment includes a first flexible wiring board 82 having a configuration different from that of the first flexible wiring board 60 instead of the first flexible wiring board 60. It has the same configuration as the first embodiment except for this point. Therefore, while the configuration of the first flexible wiring board 82 in the fourth embodiment will be described in detail below, the description of other configurations will be omitted.

As shown in FIG. 9, the first flexible wiring board 82, like the first flexible wiring board 60, includes a first bonded terminal 61P, a second bonded terminal 62P, and a plurality of first relay terminals 63P. , and a plurality of second relay terminals 64P.

Note that the first relay terminal 63P and the second relay terminal 64P are located at ends of the first flexible wiring board 82 opposite to the first bonded terminal 61P and the second bonded terminal 62P in the second direction D2. located in the department. Further, the tips of the first relay terminal 63P and the second relay terminal 64P each have comb-shaped tooth terminals that extend toward the opposite side from the first bonded terminal 61P and the second bonded terminal 62P. Further, in the first flexible wiring board 82, the pitch P1 in which the first relay terminals 63P and the second relay terminals 64P are alternately arranged is larger than the pitch P1 in the first flexible wiring board 60. Therefore, the pitch P2 from the center of the third relay terminal 71P to the center of the fourth relay terminal 72P on the second flexible wiring board 70 is larger in the fourth embodiment than in the first embodiment. Become.

The first adhered terminal 61P, the first relay terminal 63P, and the second relay terminal 64P are constituted by the first conductor layer 60D. The second adhered terminal 62P is constituted by the second conductor layer 60E. In addition, in FIG. 9, the outline of the portion of the first conductor layer 60D that overlaps with the first outer insulating layer 60A is shown with a broken line.

The first portion 60D1 connecting the first bonded terminal 61P and the first relay terminal 63P has the first bonded terminal 61P located at one end in the second direction D2, and each first bonded terminal 60D1 at the other end in the second direction D2. A relay terminal 63P is located there. The first conductor layer 60D extends in the second direction D2 from the first adhered terminal 61P toward each first relay terminal 63P.

The second portion 60D2 forming the second relay terminal 64P forms each second relay terminal 64P discontinuously. In other words, the second portions 60D2 are provided in the same number as the plurality of second relay terminals 64P. Each second portion 60D2 extends along the first direction D1 from the second relay terminal 64P toward the first relay terminal 63P that sandwiches the second relay terminal 64P.

As shown in FIG. 10, in the second conductor layer 60E constituting the second adhered terminal 62P, the second adhered terminal 62P is located at one end in the second direction D2, and the other end in the second direction D2 is located at the second conductor layer 60E. It overlaps with each second portion 60D2 constituting the second relay terminal 64P. In addition, in FIG. 10, the outline of the second conductor layer 60E is shown with a broken line.

A portion where the second conductor layer 60E and each second portion 60D2 overlap is electrically connected to the second conductor layer 60E and each second portion 60D2 via a plurality of through holes 65, and is configured as an interlayer connection portion 65A. be done. That is, in the first flexible wiring board 82, an interlayer connection portion 65A is provided for each second relay terminal 64P. Each interlayer connection portion 65A is provided adjacent to both ends of each second relay terminal 64P in the first direction D1. For example, the interlayer connection portion 65A is located between two first relay terminals 63P so as to sandwich the second relay terminal 64P. Note that the interlayer connection portion 65A may be provided adjacent to at least one end of each second relay terminal 64P in the first direction D1.

A portion of the second conductor layer 60E that connects the second bonded terminal 62P and each interlayer connection portion 65A connects the first bonded terminal 61P of the first portion 60D1 with each first relay via the inner insulating layer 60C. It overlaps with the part connecting with the terminal 63P.

According to the arrangement of the first conductor layer 60D and the second conductor layer 60E as described above, the first relay terminal 63P and the second relay terminal 64P are arranged in the second direction D2 in the first flexible wiring board 82. Can be placed at one end. In this case, compared to the first flexible wiring board 60 of the first embodiment, the wiring path connecting the second bonded terminal 62P and each second relay terminal 64P can be shortened. As a result, the width W4 of the first flexible wiring board 82 along the second direction D2 can be made smaller than the width W1 of the first flexible wiring board 60.

Further, in the first flexible wiring board 82 of the fourth embodiment, the second relay terminal 64P and the interlayer connection portion 65A are arranged in parallel along the first direction D1. Therefore, compared to the first flexible wiring board 81 of the third embodiment, the interlayer connection part 65A is not interposed between the second adhered terminal 62P and the second relay terminal 64P in the second direction D2. Therefore, the width W4 can be made smaller than the width W3.

Note that in the first flexible wiring board 81 of the third embodiment, compared to the first flexible wiring board 82 of the fourth embodiment, there is a gap between the first relay terminal 63P and the second relay terminal 64P. The pitch P1 can be reduced by the amount that the interlayer connection portion 65A is not present. Therefore, in the first direction D1, the arrangement of the second flexible wiring board 70 with respect to the first flexible wiring board 81 can be changed every shorter distance.

[Effects of the fourth embodiment]
According to the fourth embodiment described above, the following effects can be obtained.
(4-1) By providing the interlayer connection portion 65A for each second relay terminal 64P, the width W4 of the first flexible wiring board 82 along the second direction D2 is changed from the width W1 of the first flexible wiring board 60. It can be made smaller than. As a result, when the flexible wiring board unit 50 is connected to the light control sheet 10, the length by which the first flexible wiring board 82 protrudes from the light control sheet 10 can be reduced. Furthermore, even with the flexible wiring board unit 50 including the first flexible wiring board 82, effects similar to (1-1) to (1-3) and (1-5) above can be obtained. I can do it.

(4-2) By arranging the second relay terminal 64P and the interlayer connection portion 65A in parallel along the first direction D1, the width W4 along the second direction D2 of the first flexible wiring board 82 is It can be made smaller than the width W3 of the flexible wiring board 81.

[Fifth embodiment]
Next, a fifth embodiment of the light control unit 1 will be described with reference to FIGS. 11 to 13. Note that the light control unit 1 of the fifth embodiment includes a first flexible wiring board 83 and a second flexible wiring board instead of the first flexible wiring board 60 and the second flexible wiring board 70. It has the same configuration as the first embodiment except for the point that 90 is provided. Therefore, in the following, while the configurations of the first flexible wiring board 83 and the second flexible wiring board 90 in the fifth embodiment will be described in detail, description of the other configurations will be omitted.

As shown in FIG. 11, the first flexible wiring board 83 includes a first bonded terminal 61P, a second bonded terminal 62P, a plurality of first relay terminals 63P, and a plurality of second relay terminals 64P. The first adhered terminal 61P and the plurality of first relay terminals 63P face the first space side (the front side of the paper in FIG. 11) defined by the light control sheet 10. The second adhered terminal 62P and the plurality of second relay terminals 64P face the second space side (the back side of the paper in FIG. 11) defined by the light control sheet 10. Therefore, the first relay terminal 63P and the second relay terminal 64P face opposite directions.

The first adhered terminal 61P and the first relay terminal 63P are constituted by the first conductor layer 60D. In addition, in FIG. 11, the outline of the portion of the first conductor layer 60D that overlaps with the first outer insulating layer 60A is shown with a broken line. The second adhered terminal 62P and the second relay terminal 64P are constituted by the second conductor layer 60E. The second adhered terminal 62P and the second relay terminal 64P are portions of the second conductor layer 60E exposed toward the second space from the second outer insulating layer 60B.

Each of the first relay terminals 63P and each of the second relay terminals 64P is located at an end of the first flexible wiring board 83 opposite to the first bonded terminal 61P and the second bonded terminal 62P in the second direction D2. located in the department. Further, the tips of the first relay terminal 63P and the second relay terminal 64P each have comb-shaped tooth terminals that extend toward the opposite side from the first bonded terminal 61P and the second bonded terminal 62P.

In the first conductor layer 60D, the first bonded terminal 61P is located at one end in the second direction D2, and each first relay terminal 63P is located at the other end in the second direction D2. The first conductor layer 60D extends in the second direction D2 from the first adhered terminal 61P toward each first relay terminal 63P.

As shown in FIG. 12, in the second conductor layer 60E, the second bonded terminal 62P is located at one end in the second direction D2, and each second relay terminal 64P is located at the other end in the second direction D2. In addition, in FIG. 12, the outline of the second conductor layer 60E is shown with a broken line. The second conductor layer 60E extends in the second direction D2 from the second adhered terminal 62P toward each second relay terminal 64P.

A portion of the second conductor layer 60E that connects the second bonded terminal 62P and each second relay terminal 64P connects the first bonded terminal 61P of the first conductor layer 60D and each of the second relay terminals 64P through the inner insulating layer 60C. It overlaps with the part connecting with the 1 relay terminal 63P.

According to the arrangement of the first conductor layer 60D and the second conductor layer 60E as described above, the first relay terminal 63P and the second relay terminal 64P are arranged in the second direction D2 in the first flexible wiring board 83. Can be placed at one end. In this case, compared to the first flexible wiring board 60 of the first embodiment, the wiring path connecting the second bonded terminal 62P and each second relay terminal 64P can be shortened. As a result, the width W5 of the first flexible wiring board 83 along the second direction D2 can be made smaller than the width W1 of the first flexible wiring board 60.

In the case of the first flexible wiring board 83, a structure such as a through hole 65 for electrically connecting the first conductor layer 60D and the second conductor layer 60E is unnecessary. Therefore, the flexibility and bending resistance of the first flexible wiring board 83 can be improved.

As shown in FIG. 13, the second flexible wiring board 90 includes a third outer insulating layer 90A, a fourth outer insulating layer 90B, an inner insulating layer 90C, a third conductor layer 90D, and a fourth conductor layer 90E. . The inner insulating layer 90C is located between the third outer insulating layer 90A and the fourth outer insulating layer 90B. The third outer insulating layer 90A is located on the side of the first space defined by the light control sheet 10 (the back side of the paper in FIG. 13) with respect to the inner insulating layer 90C. The fourth outer insulating layer 90B is located on the second space side (on the front side of the paper in FIG. 13) defined by the light control sheet 10 with respect to the inner insulating layer 90C. The third outer insulating layer 90A, the fourth outer insulating layer 90B, and the inner insulating layer 90C are insulating resin films, and are made of polyimide, for example.

The third conductor layer 90D is located between the third outer insulating layer 90A and the inner insulating layer 90C. The fourth conductor layer 90E is located between the fourth outer insulating layer 90B and the inner insulating layer 90C. The third conductor layer 90D and the fourth conductor layer 90E are conductive metal films, and are made of copper foil, for example.

In the second flexible wiring board 90, the third relay terminal 71P, the first power supply terminal 73P, and the second power supply terminal 74P have the fourth conductor layer 90E directed from the fourth outer insulating layer 90B toward the second space side. This is the exposed part. In the second flexible wiring board 90, the fourth relay terminal 72P is a portion of the third conductor layer 90D exposed from the third outer insulating layer 90A toward the first space side. Therefore, the third relay terminal 71P and the fourth relay terminal 72P face opposite directions.

The third relay terminal 71P and the first power supply terminal 73P are electrically connected inside the second flexible wiring board 90 via the fourth conductor layer 90E. Note that the portion of the fourth conductor layer 90E that constitutes the third relay terminal 71P and the first power terminal 73P is electrically insulated from the portion that constitutes the second power terminal 74P.

The third conductor layer 90D that constitutes the fourth relay terminal 72P is electrically connected via a plurality of through holes 91 to a portion of the fourth conductor layer 90E that constitutes the second power supply terminal 74P. Therefore, the fourth relay terminal 72P and the second power supply terminal 74P are electrically connected via the third conductor layer 90D, the fourth conductor layer 90E, and the through hole 91 inside the second flexible wiring board 90. has been done. Note that the number of through holes 91 may be one or two or more.

In the case of the fifth embodiment, the third relay terminal 71P is connected to one of the first relay terminal 63P and the second relay terminal 64P, and the other of the first relay terminal 63P and the second relay terminal 64P is connected. Connection of the fourth relay terminal 72P to each terminal is performed separately.

[Effects of the fifth embodiment]
According to the fifth embodiment, the following effects can be obtained.
(5-1) In the first flexible wiring board 83, the first bonded terminal 61P and the first relay terminal 63P are constituted by the first conductor layer 60D, and the second bonded terminal 62P and the second relay terminal 64P and are constituted by the second conductor layer 60E. Thereby, the width W5 of the first flexible wiring board 83 along the second direction D2 can be made smaller than the width W1 of the first flexible wiring board 60. As a result, when the flexible wiring board unit 50 is connected to the light control sheet 10, the length by which the first flexible wiring board 83 protrudes from the light control sheet 10 can be reduced. Further, even with the flexible wiring board unit 50 including the first flexible wiring board 83, effects similar to the above (1-1) can be obtained.

(5-2) In the first flexible wiring board 83, a structure such as the through hole 65 for electrically connecting the first conductor layer 60D and the second conductor layer 60E is unnecessary. Therefore, the flexibility and bending resistance of the first flexible wiring board 83 can be improved.

[Example of change]
Note that the first to fifth embodiments described above can be implemented with the following modifications. In addition, the modification examples shown below can be combined within a technically consistent range.

- In the first to fifth embodiments, the shape of the reference part 66 and the positioning part 75 may be such that the two relay terminals to be connected can be appropriately arranged based on the arrangement of the positioning part 75 with respect to the reference part 66. good. Further, if high precision is not required for the arrangement of the third relay terminal 71P and the fourth relay terminal 72P with respect to the first relay terminal 63P and the second relay terminal 64P, the reference part 66 and the positioning part 75 may not be provided. good.

- In the first to fifth embodiments, the pitch P2 from the center of the third relay terminal 71P to the center of the fourth relay terminal 72P is larger than the pitch P1 between the first relay terminal 63P and the second relay terminal 64P. It's okay. For example, the pitch P2 may be an odd multiple (excluding 1) of the pitch P1. That is, when the third relay terminal 71P is electrically connected to one of the first relay terminal 63P and the second relay terminal 64P, the fourth relay terminal 72P is connected to the first relay terminal 63P and the second relay terminal 64P. Any configuration is sufficient as long as it is electrically connected to the other one.

- In the first to fourth embodiments, the first power terminal 73P and the second power terminal 74P of the second flexible wiring board 70 may face opposite directions. In this case, in the second flexible wiring board 70, a through hole is provided between the third relay terminal 71P and the first power terminal 73P or between the fourth relay terminal 72P and the second power terminal 74P. . In the case of such a configuration, the degree of freedom in connecting the first power terminal 73P and the second power terminal 74P to the external power source 1A is increased.

- In the fifth embodiment, the first power terminal 73P and the second power terminal 74P of the second flexible wiring board 90 may face opposite directions. For example, the second power supply terminal 74P may be configured by the third conductor layer 90D. In this case, the first power terminal 73P faces the second space, while the second power terminal 74P faces the first space. The fourth relay terminal 72P and the second power supply terminal 74P are electrically connected inside the second flexible wiring board 90 via the third conductor layer 90D. With such a configuration, in the second flexible wiring board 90, a configuration such as a through hole 91 for electrically connecting the third conductor layer 90D and the fourth conductor layer 90E is unnecessary. Therefore, the flexibility and bending resistance of the second flexible wiring board 90 can be improved.

- In the first to fifth embodiments, among the plurality of first relay terminals 63P, in the first relay terminals 63P that are not connected to the third relay terminal 71P, the first outer insulating layer 60A located on the outer surface side is not removed. Additionally, it may be covered with a first outer insulating layer 60A. In other words, among the plurality of first relay terminals 63P, at least the first relay terminal 63P connected to the third relay terminal 71P should be exposed from the first outer insulating layer 60A. By covering the first relay terminal 63P that is not connected to the third relay terminal 71P with the first outer insulating layer 60A, it is possible to simplify the work of sealing the first relay terminal 63P that is not connected to the third relay terminal 71P. Note that similar changes can be made to the second relay terminals 64P that are not connected to the fourth relay terminal 72P among the plurality of second relay terminals 64P.

- In the first to fifth embodiments, the first transparent electrode sheet 20 may include other functional layers such as an ultraviolet shielding layer, an infrared shielding layer, an alignment layer, an adhesive layer, and a protective layer. The second transparent electrode sheet 30 may include other functional layers such as an ultraviolet shielding layer, an infrared shielding layer, an alignment layer, an adhesive layer, and a protective layer.

- In the first to fifth embodiments, the light control sheet 10 is not limited to a rectangular shape, but may be a polygonal shape other than a rectangular shape, a circular shape, an elliptical shape, or other geometric shape, or an irregular shape other than a geometric shape. But that's fine. The light control sheet 10 is not limited to a two-dimensional planar shape, but may have a curved shape such as a cylindrical shape, a spherical shape, or a wavy shape.

D1...First direction D2...Second direction P1, P2...Pitch 1...Dimmer unit 1A...External power supply 10...Dimmer sheet 10E...Edge 20...First transparent electrode sheet 22P...First electrode terminal 30...Second Transparent electrode sheet 32P...Second electrode terminal 40...Dimmer layer 50...Flexible wiring board unit 60, 80-83...First flexible wiring board 61P...First bonded terminal 62P...Second bonded terminal 63P ...First relay terminal 64P...Second relay terminal 70,90...Second flexible wiring board 71P...Third relay terminal 72P...Fourth relay terminal 73P...First power supply terminal 74P...Second power supply terminal

Claims (5)

a first flexible wiring board extending in a first direction;
a second flexible wiring board extending in a second direction and connected to the first flexible wiring board such that the second direction intersects the first direction;
The first flexible wiring board includes:
a first bonded terminal and a second bonded terminal arranged in the first direction;
Inside the first flexible wiring board, a plurality of first relay terminals are electrically connected to the first bonded terminals, and a plurality of second relay terminals are electrically connected to the second bonded terminals. Equipped with a relay terminal,
In the first direction, the first relay terminals and the second relay terminals are arranged alternately at a constant pitch and in a row,
The second flexible wiring board includes:
a third relay terminal and a fourth relay terminal located at one end in the second direction;
comprising a first power terminal and a second power terminal located at the other end in the second direction,
The first power supply terminal and the second power supply terminal are each connected to an external power supply,
When the third relay terminal is electrically connected to one of the first relay terminal and the second relay terminal, the fourth relay terminal is connected to one of the first relay terminal and the second relay terminal. The fourth relay terminal is arranged with respect to the third relay terminal so as to be electrically connected to the other of the flexible wiring board units. In the first flexible wiring board,
the first relay terminal and the second relay terminal face the same direction,
In the second flexible wiring board,
The flexible wiring board unit according to claim 1, wherein the third relay terminal and the fourth relay terminal face the same direction. In the first flexible wiring board,
The first bonded terminal faces the same direction as the first relay terminal and the second relay terminal,
The second bonded terminal faces in a direction opposite to the first relay terminal and the second relay terminal,
In the second flexible wiring board,
The flexible wiring board unit according to claim 2, wherein the first power terminal and the second power terminal face the same direction as the third relay terminal and the fourth relay terminal. In the first flexible wiring board,
The first relay terminal and the second relay terminal face opposite directions,
The first bonded terminal faces the same direction as the first relay terminal,
The second bonded terminal faces the same direction as the second relay terminal,
In the second flexible wiring board,
The flexible wiring board unit according to claim 1, wherein the third relay terminal and the fourth relay terminal face opposite directions. a light control sheet having an edge extending in a first direction;
A light control unit comprising: a flexible wiring board unit adhered to the edge;
The light control sheet is
a first transparent electrode sheet including a first electrode terminal;
a second transparent electrode sheet including a second electrode terminal;
the light control layer located between the first transparent electrode sheet and the second transparent electrode sheet such that the first electrode terminal and the second electrode terminal are exposed from the light control layer;
the first electrode terminal and the second electrode terminal constitute the edge and are arranged along the first direction,
The flexible wiring board unit includes:
a first flexible wiring board extending in the first direction;
a second flexible wiring board extending in a second direction and connected to the first flexible wiring board such that the second direction intersects the first direction;
The first flexible wiring board includes:
a first bonded terminal and a second bonded terminal arranged in the first direction;
Inside the first flexible wiring board, a plurality of first relay terminals are electrically connected to the first bonded terminals, and a plurality of second relay terminals are electrically connected to the second bonded terminals. Equipped with a relay terminal,
The first bonded terminal is bonded to the first electrode terminal in a conductive manner,
the second bonded terminal is bonded to the second electrode terminal in a conductive manner;
In the first direction, the first relay terminals and the second relay terminals are arranged alternately at a constant pitch and in a row,
The second flexible wiring board includes:
a third relay terminal and a fourth relay terminal located at one end in the second direction;
comprising a first power terminal and a second power terminal located at the other end in the second direction,
The first power supply terminal and the second power supply terminal are each connected to an external power supply,
The third relay terminal is electrically connected to one of the first relay terminal and the second relay terminal, and the fourth relay terminal is electrically connected to the other of the first relay terminal and the second relay terminal. Electrically connected dimmer unit.

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