Telescopic device

Abstract

Provided is a retractable device in which a frame region is narrowed. A stretchable device is provided with a stretchable substrate extending in a planar direction, and a pair of stretchable resin layers sandwiching the stretchable substrate from both sides in a lamination direction intersecting the planar direction. When viewed from the stacking direction, the surface is divided into a central region located at the central portion of the surface and a frame region located at the edge portion of the surface and surrounding the central region. The stretchable substrate has a resin base material and an array layer arranged in a lamination direction. The resin base material has a hinge portion that extends while meandering in the plane direction. The hinge portion has a plurality of arcuate portions formed in an arcuate shape when viewed from the stacking direction. The arcuate portion has a central region arcuate portion disposed in the central region and a frame region arcuate portion disposed in the frame region. The radius of curvature of the frame region arcuate portion is smaller than the radius of curvature of the center region arcuate portion.

Description

Technical Field

[0001] The present invention relates to a stretchable device. Background Art

[0002] A retractable device has a retractable substrate with excellent retractability and flexibility. As shown in Patent Document 1, the retractable substrate has a resin substrate and an array layer provided on the resin substrate. The resin substrate has a hinge. The hinge is a so-called zigzag shape, extending in a planar direction while winding. In addition, a circuit is provided on the array layer. There are many types of circuits, for example, a strain detection circuit for detecting a retractable load in a planar direction of the retractable device, a pressure detection circuit for detecting a pressure input to a surface of the retractable device, and a light detection circuit for detecting light incident on the retractable device.

[0003] In the above circuit, the detection element for detecting the load, etc. is usually arranged in the central part of the retractable device (hereinafter referred to as the central area). That is, the central area is the detection area for detecting the load, etc. On the other hand, the edge of the retractable device surrounding the central part of the retractable device is provided with wiring for supplying signals and power to the detection element. In addition, the edge of the retractable device is frame-shaped, and therefore, it is hereinafter referred to as the frame area.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2020-202208 Summary of the invention

[0007] However, since the hinge is meandering, its dimension in the direction perpendicular to the straight line connecting one end of the hinge and the other end (hereinafter also referred to as the width direction) is large. In other words, the area occupied by the hinge in the width direction is large, and the frame area of ​​the retractable device is enlarged.

[0008] An object of the present invention is to provide a retractable device capable of achieving a narrower frame area.

[0009] A retractable device according to one embodiment of the present disclosure includes: a retractable substrate extending in a planar direction including a first direction and a second direction intersecting the first direction; and a pair of retractable resin layers sandwiching the retractable substrate from both sides of a stacking direction intersecting the planar direction. The retractable resin layer of one of the pair of retractable resin layers has a surface facing in an opposite direction to the retractable substrate. When viewed from the stacking direction, the surface is divided into a central region located in the central portion of the surface and a frame region located at the edge of the surface and surrounding the central region. The retractable substrate includes a resin substrate and an array layer arranged in the stacking direction. The resin substrate includes a hinge extending while meandering in the planar direction. The hinge includes a plurality of arc portions formed in an arc shape when viewed from the stacking direction. The arc portion includes an arc portion for the central region arranged in the central region and an arc portion for the frame region arranged in the frame region. The radius of curvature of the arc portion for the frame region is smaller than the radius of curvature of the arc portion for the central region. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a perspective view of the retractable device according to Embodiment 1 as viewed from the front surface.

[0011] Figure 2 This is a diagram schematically showing a cross section of the retractable device according to the first embodiment.

[0012] Figure 3 This is a diagram of a portion of the resin substrate according to the first embodiment, as viewed from the first stacking direction.

[0013] Figure 4 This is a diagram of the longitudinal hinge portion of the first embodiment as viewed from the first stacking direction.

[0014] Figure 5 This is an enlarged view of the vicinity of the boundary line between the central region and the frame region in the resin substrate of Embodiment 1.

[0015] Figure 6 Yes Figure 5 An enlarged view of the range enclosed by frame line VI.

[0016] Figure 7 This is a diagram of the resin base material arranged in the frame region according to Modification 1, as viewed from the first stacking direction.

[0017] Figure 8 This is a diagram of the resin base material arranged in the frame region according to Modification 2, as viewed from the first stacking direction.

[0018] Fig. 9 This is an enlarged view of the vicinity of the boundary line between the central region and the frame region in the resin substrate of Modification 3.

[0019] Description of Reference Numerals

[0020] 5 Central Area

[0021] 6 Frame Area

[0022] 10 Scalable substrate

[0023] 11. Resin substrate

[0024] 12 Hinge

[0025] 12A longitudinal hinge

[0026] 12B horizontal hinge

[0027] 13 Main body

[0028] 19 Lightening Holes

[0029] 20 Arc

[0030] 21 1st arc

[0031] 22 Second arc

[0032] 23 1st base

[0033] 24 Second base

[0034] 25 1st bending part

[0035] 26 Second bending part

[0036] 30 Array Layer

[0037] 51, 52, 53, 54, 55, 56 Wiring

[0038] 60 First stretchable resin layer

[0039] 70 Second stretchable resin layer

[0040] 80, 81, 82, 83 fictitious part

[0041] 100 Scalable Devices

[0042] 512 Central area hinge

[0043] 513 Main body for central area

[0044] 520 Arc part for central area

[0045] 521 First arc part for central area

[0046] 522 Second arc part for central area

[0047] 612 hinge for frame area

[0048] 613 Main body for frame area

[0049] 620 Arc part for frame area

[0050] 621 1st arc portion for frame area

[0051] 622 Frame area second arc portion

[0052] 712 Long hinge

[0053] 712A, 712B, 712C Split hinge

[0054] 728 Slit DETAILED DESCRIPTION

[0055] The method (implementation mode) for implementing the present disclosure is described in detail with reference to the accompanying drawings. The invention of the present disclosure is not limited by the contents described in the following implementation modes. In addition, the structural elements described below include elements that can be easily thought of by those skilled in the art and elements that are essentially the same. Moreover, the structural elements described below can be appropriately combined. It should be noted that the disclosed content is only an example, and appropriate changes that can be easily thought of by those skilled in the art to maintain the main purpose of the invention are of course included in the scope of the present invention. In order to make the description clearer, there are drawings that schematically indicate the width, thickness, shape, etc. of each part compared to the actual state, but this is only an example and does not limit the interpretation of the present invention. In addition, in this specification and each figure, for the same structural elements as those described in the drawings that have appeared, the same figure mark is sometimes marked and the detailed description is appropriately omitted.

[0056] In addition, in the present specification and claims, when expressing the state in which another structure is arranged on a certain structure, when it is simply expressed as "on...", unless otherwise specified, it includes both the case in which the other structure is arranged directly on the certain structure in a manner of contacting the certain structure and the case in which the other structure is arranged above the certain structure with another structure in between.

[0057] (Implementation Method 1)

[0058] Figure 1 1 is a perspective view of the retractable device of Embodiment 1 viewed from a direction opposite to the surface. Figure 1 As shown, the retractable device 100 is formed in a flat plate shape. The retractable device 100 has a surface 1 and a back surface 2 facing opposite directions (the back surface 2 is Figure 1 Not shown in the figure. Figure 2). Hereinafter, directions parallel to the front surface 1 and the back surface 2 are referred to as planar directions. In addition, directions intersecting the planar directions are referred to as lamination directions.

[0059] The retractable device 100 is formed into a rectangular (quadrilateral) shape when viewed from a direction opposite to the surface 1. Therefore, the surface 1 has a pair of long sides 3 and a pair of short sides 4. Hereinafter, the direction parallel to the plane direction and parallel to the long sides 3 is referred to as the first direction X, and the direction parallel to the short sides 4 is referred to as the second direction Y.

[0060] When viewed from a direction opposite to the surface 1, the retractable device 100 is divided into a central area 5 and a frame area 6. The central area 5 is located in the central part of the surface 1 of the retractable device 100 and is rectangular (quadrilateral) when viewed from a direction opposite to the surface 1. The frame area 6 is located at the edge of the surface 1 of the retractable device 100 and is frame-shaped (quadrilateral). In addition, Figure 1 The imaginary line M shown in the drawings shows the boundary between the central area 5 and the frame area 6 .

[0061] Figure 2 Schematic diagram of a cross section of the retractable device of Embodiment 1. Figure 2 As shown, the stretchable device 100 includes a first stretchable resin layer 60, a stretchable substrate 10, and a second stretchable resin layer 70 stacked in order in a stacking direction. In other words, the stretchable substrate 10 is sandwiched between a pair of stretchable resin layers (the first stretchable resin layer 60 and the second stretchable resin layer 70).

[0062] Hereinafter, regarding the stacking direction, the direction in which the second stretchable resin layer 70 is arranged when viewed from the first stretchable resin layer 60 is referred to as the first stacking direction Z1, and the direction opposite to the first stacking direction Z1 is referred to as the second stacking direction Z2. In addition, the situation in which the stretchable device 100 is viewed from the first stacking direction Z1 is referred to as a top view.

[0063] The first stretchable resin layer 60 and the second stretchable resin layer 70 have insulation, stretchability, and flexibility. As the resin used for the first stretchable resin layer 60 and the second stretchable resin layer 70, an acrylic elastomer can be cited. It should be noted that the first stretchable resin layer 60 and the second stretchable resin layer 70 of the present disclosure are not limited to acrylic elastomers, and may be acrylic resin, epoxy resin, polyurethane resin, etc., without particular limitation.

[0064] The first stretchable resin layer 60 and the second stretchable resin layer 70 are formed in a plate shape and extend in a planar direction. The surface of the first stretchable resin layer 60 in the second stacking direction Z2 constitutes the back surface 2 of the stretchable device 100. The first stretchable resin layer 60 has a stacking surface 61 facing the first stacking direction Z1 and facing the stretchable substrate 10.

[0065] The surface of the second stretchable resin layer 70 in the first stacking direction Z1 is a surface facing the opposite direction to the stretchable substrate 10, and constitutes the surface 1 of the stretchable device 100. The second stretchable resin layer 70 has an opposing surface 71 facing the second stacking direction Z2 and facing the stretchable substrate 10. In addition, a frame portion 72 is provided at the edge of the second stretchable resin layer 70 so as to protrude in the second stacking direction Z2 relative to the opposing surface 71.

[0066] The frame portion 72 is formed in an annular shape in a plan view, and surrounds the outer periphery of the retractable substrate 10. A surface 72a of the frame portion 72 in the second stacking direction Z2 is bonded to the stacking surface 61 of the first stretchable resin layer 60. Thus, the first stretchable resin layer 60 and the second stretchable resin layer 70 cooperate with each other to form a housing for housing the retractable substrate 10.

[0067] A plurality of lightening holes 19 penetrating in the stacking direction are formed in the stretchable substrate 10. The second stretchable resin layer 70 has a plurality of convex portions 73 that protrude from the opposing surface 71 in the second stacking direction Z2 and fill the lightening holes 19.

[0068] In addition, in the present embodiment, the lightening hole 19 is filled with the second stretchable resin layer 70 (convex portion 73), but the present disclosure may also fill the lightening hole 19 with the first stretchable resin layer 60. Alternatively, the lightening hole 19 may be filled with the first stretchable resin layer 60 and the second stretchable resin layer 70, respectively. Alternatively, the lightening hole 19 may be filled with a resin other than the first stretchable resin layer 60 and the second stretchable resin layer 70. In addition, nothing may be arranged in the lightening hole 19 to leave it as a space.

[0069] The stretchable substrate 10 includes: a resin base material 11 overlapped on the lamination surface 61 of the first stretchable resin layer 60; and an array layer 30 laminated on the resin base material 11. The resin base material 11 is bonded to the lamination surface 61 of the first stretchable resin layer 60. The resin base material 11 has stretchability, flexibility and insulation. The resin base material 11 is made of a resin material such as polyimide.

[0070] Figure 3 FIG. 1 is a view of a portion of the resin substrate arranged in the central region of the first embodiment as viewed from the first stacking direction. Figure 3 As shown, the resin base material 11 has a plurality of main body portions 13 and a plurality of hinge portions 12 extending in a planar direction while meandering.

[0071] The hinge 12 has two types, namely, a longitudinal hinge 12A extending in the first direction X and a transverse hinge 12B extending in the second direction Y. In addition, if the transverse hinge 12B is rotated 90°, it becomes the same shape as the longitudinal hinge 12A. Therefore, in the detailed description of the hinge 12 described later, the longitudinal hinge 12A is described as a representative example, and the description of the transverse hinge 12B is omitted. In addition, the main body 13 is arranged at the confluence point (convergence point) of the longitudinal hinge 12A and the transverse hinge 12B, and is connected to the longitudinal hinge 12A and the transverse hinge 12B respectively.

[0072] In addition, the main body 13 is a quadrilateral (square) in a plan view. The main body 13 is configured so that the four corners point in the first direction X and the second direction Y. A plurality of main bodies 13 are arranged in the first direction X and the second direction Y and are separated from each other. It should be noted that in the present disclosure, the shape of the main body 13 in a plan view is not limited to a quadrilateral, and may also be a circular shape or other polygonal shape.

[0073] In addition, in the resin base material 11, a portion where the main body portion 13 and the hinge portion 12 are not provided is a lightening hole 19 that penetrates the retractable base plate 10 in the thickness direction.

[0074] Although not particularly shown, the array layer 30 includes a plurality of insulating layers stacked in a stacking direction and circuits provided in the plurality of insulating layers. Examples of the types of circuits include a strain detection circuit for detecting a telescopic load in a planar direction of the telescopic device 100, a pressure detection circuit for detecting a pressure input to a surface of the telescopic device 100, and a light detection circuit for detecting light incident on the telescopic device 100. However, the types of circuits are not particularly limited in the present disclosure.

[0075] In such a circuit, functional elements such as transistors are stacked on the main body 13. Wiring for supplying signals and power to the functional elements is arranged across the plurality of hinges 12 and the plurality of main bodies 13, and extends in the planar direction.

[0076] According to the above structure, the rigidity of the portion (hinge 12) of the telescopic device 100 adjacent to the lightening hole 19 is low. Therefore, when a load in the planar direction acts on the telescopic device 100, the hinge 12 is deformed. On the other hand, the deformation amount of the main body 13 is extremely small, and damage to the functional elements stacked on the main body 13 can be suppressed.

[0077] Next, the hinge portion 12 of the retractable base 10 will be described in detail. Figure 4 This is a diagram of the longitudinal hinge portion of Embodiment 1 as viewed from the first stacking direction. For convenience of description, one of the two main body portions 13 provided at both ends of the longitudinal hinge portion 12A is referred to as a first main body portion 13a, and the other is referred to as a second main body portion 13b.

[0078] The longitudinal hinge portion 12A has an arc-shaped arc portion 20. The arc portion 20 has a first arc portion 21 protruding in one direction of the second direction Y and a second arc portion 22 protruding in the other direction of the second direction Y. Thus, the longitudinal hinge portion 12A meanders in the second direction Y.

[0079] In addition, a linear first base portion 23 is provided between the first arc portion 21 and the first main body portion 13a. A linear second base portion 24 is provided between the second arc portion 22 and the second main body portion 13b. The connection portion between the first arc portion 21 and the first base portion 23 is a first curved portion 25 curved in an arc shape. The connection portion between the second arc portion 22 and the second base portion 24 is a second curved portion 26 curved in an arc shape. The first curved portion 25 and the second curved portion 26 are quarter-circular.

[0080] The above is the basic structure of the hinge portion 12 (vertical hinge portion 12A). Figure 5 FIG. 1 is an enlarged view of the vicinity of the boundary line between the central region and the frame region in the resin substrate of Embodiment 1. Figure 5 As shown, the resin base material 11 is included in both the central region 5 and the frame region 6 in a plan view. Therefore, the hinge portion 12 includes a central region hinge portion 512 arranged in the central region 5 and a frame region hinge portion 612 arranged in the frame region 6. In addition, the main body 13 includes a central region main body portion 513 arranged in the central region 5 and a frame region main body portion 613 arranged in the frame region 6. The details of the central region hinge portion 512 and the frame region hinge portion 612 are described below.

[0081] like Figure 4 As shown, the central region hinge portion 512 includes a central region first base portion 523 (first base portion 23), a central region first curved portion 525 (first curved portion 25), a central region first arc portion 521 (first arc portion 21), a central region second arc portion 522 (second arc portion 22), a central region second curved portion 526 (second curved portion 26), and a central region second base portion 524 (second base portion 24), which are arranged in order from the first main body portion 13a toward the second main body portion 13b. Hereinafter, the central region first arc portion 521 and the central region second arc portion 522 are collectively referred to as the central region arc portion 520.

[0082] The width L1 of the central region hinge 512 is constant from one end to the other end of the central region hinge 512. Therefore, the width of the central region arc portion 520 is also L1. In addition, the radius of curvature of the central region arc portion 520 is R1. In addition, the width direction occupied by the central region first arc portion 521 and the central region second arc portion 522 (in Figure 4In other words, the dimension in the width direction occupied by the hinge portion 512 in the central region is W1.

[0083] In addition, if Figure 5 As shown, a part of the central region hinges 512 among the plurality of central region hinges 512 exceeds the imaginary line M and is arranged in the frame region 6. As described above, in the present disclosure, in the vicinity of the imaginary line M, a part of the central region hinges 512 may be arranged in the frame region 6, or a part of the frame region hinges 612 may be arranged in the central region 5.

[0084] Figure 6 Yes Figure 5 The enlarged image of the range enclosed by the frame line VI. Figure 6 As shown, the frame area hinge portion 612 has a frame area first base portion 623 (first base portion 23), a frame area first curved portion 625 (first curved portion 25), a frame area first arc portion 621 (first arc portion 21), a frame area second arc portion 622 (second arc portion 22), a frame area second curved portion 626 (second curved portion 26), and a frame area second base portion 624 (second base portion 24) arranged in sequence. Hereinafter, the frame area first arc portion 621 and the frame area second arc portion 622 are collectively referred to as the frame area arc portion 620.

[0085] The width L2 of the frame area hinge portion 612 is constant from one end to the other end of the frame area hinge portion 612. Therefore, the width of the frame area arc portion 620 is also L2.

[0086] The curvature radius of the frame area arc portion 620 is R2. The curvature radius R2 of the frame area arc portion 620 is smaller than the curvature radius R1 of the central area arc portion 520 (see Figure 4 ). Therefore, the width direction dimension W2 occupied by the first arc portion 621 for the frame area and the second arc portion 622 for the frame area (see Figure 6 ) is smaller than the width dimension W1 occupied by the first arc portion 521 for the central region and the second arc portion 522 for the central region (refer to Figure 4 ). That is, the frame region hinge 612 occupies a smaller area in the width direction than the central region hinge 512. Thus, the frame region 6 can be narrowed without reducing the number of frame region hinges 612 arranged in the width direction of the frame region hinge 612.

[0087] In addition, regarding the arc portion 20, if the radius of curvature (R1, R2) is large, the length of the arc portion 20 becomes large, and the arc portion 20 is easy to deform. On the other hand, if the width (L1, L2) of the arc portion 20 is large, the rigidity of the arc portion 20 becomes high, and the arc portion 20 is difficult to deform. In the present embodiment, the value obtained by dividing the radius of curvature R2 by the width L2 (R2 / L2) is the same as the value obtained by dividing the radius of curvature R1 by the width L1 (R1 / L1). In other words, the arc portion 620 for the frame area and the arc portion 520 for the central area are similar shapes (the reduction ratio in the first direction X is the same as the reduction ratio in the second direction Y). Therefore, the elasticity (ease of deformation) of the arc portion 620 for the frame area and the arc portion 520 for the central area are the same.

[0088] In addition, in the present embodiment, not only the arc portion 20 (the arc portion 620 for the frame area and the arc portion 520 for the central area), but also the overall shape of the frame area hinge portion 612 and the overall shape of the central area hinge portion 512 are similar shapes (the reduction ratio in the first direction X is the same as the reduction ratio in the second direction Y). Therefore, the elasticity of the frame area hinge portion 612 and the central area hinge portion 512 is also the same. In addition, the frame area main body portion 613 and the central area main body portion 513 are also similar shapes (the reduction ratio in the first direction X is the same as the reduction ratio in the second direction Y). The reduction ratio between the frame area main body portion 613 and the central area main body portion 513 is the same as the reduction ratio between the frame area hinge portion 612 and the central area hinge portion 512.

[0089] Embodiment 1 has been described above, but the present embodiment is not limited to the example described in Embodiment 1. For example, in the embodiment, the value obtained by dividing the radius of curvature R2 by the width L2 (R2 / L2) is the same as the value obtained by dividing the radius of curvature R1 by the width L1 (R1 / L1) (similar shapes), but they may be different in the present disclosure. That is to say, in the present disclosure, the arc portion 620 for the frame area and the arc portion 520 for the central area may not be similar shapes. This is because, even with such a hinge portion 12, if the radius of curvature R2 of the arc portion 620 for the frame area is smaller than the radius of curvature R1 of the arc portion 520 for the central area, the narrowing of the frame area 6 can be achieved. Therefore, in the present disclosure, the hinge portion 612 for the frame area and the hinge portion 512 for the central area may not be similar shapes. In addition, the main body portion 613 for the frame area and the main body portion 513 for the central area may not be similar shapes. In addition, even if the frame area main body 613 and the central area main body 513 are similar in shape, the reduction ratio between the frame area main body 613 and the central area main body 513 and the reduction ratio between the frame area hinge 612 and the central area hinge 512 may be different.

[0090] In addition, the present disclosure may not arrange the frame area main body 613 between the frame area hinges 612. Hereinafter, a modification example 1 in which the frame area main body 613 is not arranged will be described. In addition, in the description of each modification example, the differences from the first embodiment will be focused on.

[0091] Figure 7 FIG. 1 is a view of the resin substrate 11 disposed in the frame region 6 of Modification 1 as viewed from the first stacking direction. Figure 7 As shown, the resin substrate 11 of the modification example 1 is different from the embodiment 1 in that only a plurality of frame region hinges 612 are arranged in the frame region 6. Therefore, the frame region hinge 612 is connected to the end of the adjacent frame region hinge 612. In addition, the plurality of frame region hinges 612 are connected to form a long hinge 712.

[0092] Although not specifically shown in the figure, the long hinge 712 extends in the circumferential direction outside the central area 5. In addition, one end of the long hinge 712 extends to the central area 5 and is connected to the central area main body 513 arranged in the central area 5. Thus, the wiring arranged in the long hinge 712 is connected to the element arranged in the central area 5. In addition, the long hinges 712 do not intersect (are not connected) with each other. The long hinge 712 on the outer peripheral side surrounds the outer side of the long hinge 712 on the inner peripheral side and extends to the central area 5. Therefore, the extension length of the long hinge 712 arranged on the outer peripheral side among the multiple long hinges 712 is greater.

[0093] In addition, the wirings 51, 52, 53 of the array layer 30 are stacked on the long hinge portion 712 of Modification 1. The wirings 51, 52, 53 extend along the long hinge portion 712. Thus, the wirings 51, 52, 53 extend circumferentially outside the central region 5 in the same manner as the long hinge portion 712.

[0094] The wirings 51, 52, and 53 are arranged in the order from the central area 5 to the outside. In other words, the wiring 52 (peripheral wiring) is arranged on the outer peripheral side compared to the wiring 51 (inner peripheral wiring), and the extension length is greater than that of the wiring 51. Similarly, the wiring 53 (peripheral wiring) is arranged on the outer peripheral side compared to the wiring 52 (inner peripheral wiring), and the extension length is greater than that of the wiring 52.

[0095] In such a configuration relationship, the width of wiring 52 (peripheral wiring) is larger than the width of wiring 51 (inner peripheral wiring). In addition, the width of wiring 53 (peripheral wiring) is larger than the width of wiring 52 (inner peripheral wiring). Here, the resistance value of the wiring is obtained by dividing the length of the wiring by the cross-sectional area (width) of the wiring. Assuming that the widths of wirings 51, 52, and 53 are the same, the resistance value decreases in the order of wirings 53, 52, and 51 starting from the wiring with a large length. On the other hand, in Modification Example 1, the larger the length of the wiring, the larger the cross-sectional area (width), and the resistance values ​​of wirings 51, 52, and 53 are the same. Therefore, it is possible to supply, for example, the same amount of current to the elements respectively connected to wirings 51, 52, and 53, and it is possible to improve the detection accuracy.

[0096] Modification 1 is described above. In Modification 1, one wiring is arranged for one hinge 12 (long hinge 712), but the present disclosure is not limited thereto. Modification 2 is described below in which a plurality of wirings are arranged for one hinge 12 (long hinge 712).

[0097] Figure 8 This is a view of the resin substrate 11 arranged in the frame area 6 according to Modification 2 as viewed from the first stacking direction. Three wirings 54, 55, and 56 are arranged for one long hinge portion 712 (frame area hinge portion 612). According to Modification 2, the number of long hinge portions 712 can be reduced, and the frame area 6 can be further narrowed.

[0098] In addition, two slits 728 extending along the extending direction of the long hinge portion 712 are provided in the long hinge portion 712. Therefore, the long hinge portion 712 has divided hinge portions 712A, 712B, and 712C obtained by dividing into three parts in the width direction. In addition, in the present embodiment, the slits 728 of the long hinge portion 712 are formed by etching, but the method for forming the slits 728 is not particularly limited in the present disclosure.

[0099] The two slits 728 are arranged between the wirings 54 and 55 and between the wirings 55 and 56. Thus, the three wirings 54, 55, and 56 are arranged in the divided hinge portions 712A, 712B, and 712C, respectively.

[0100] Before describing the effects of Modification 2, a case where the slit 728 is not provided in the long hinge portion 712 is described. Assuming that the slit 728 is not provided, if, for example, a tensile load acts on the long hinge portion 712, strain is generated in the frame region arc portion 620. In addition, the strain increases as it moves away from the central portion in the width direction of the frame region arc portion 620 toward the inner circumference or the outer circumference. Therefore, the strain generated in the wiring 55 arranged in the central portion in the width direction of the frame region arc portion 620 becomes less, and the strain generated in the wirings 54 and 56 becomes more.

[0101] On the other hand, according to Modification 2, the strain generated in the frame region arc portion 620 is based on the central portion in the width direction of each of the divided hinge portions 712A, 712B, and 712C, and increases as it moves away from the inner circumference or the outer circumference. Therefore, the wirings 54 and 56 are less strained than when the slits 728 are not provided. Therefore, the possibility of the wirings 54 and 56 being disconnected is reduced.

[0102] Modification 2 has been described above, but the present disclosure may also provide a plurality of wirings in the long hinge portion 712 that is not provided with the slit 728. Next, modification 3 will be described.

[0103] Fig. 9 This is an enlarged view of the vicinity of the boundary line between the central area 5 and the frame area 6 in the resin substrate 11 of the modification example 3. The resin substrate 11 of the modification example 3 is different from the embodiment 1 in that it has a dummy portion 80. The dummy portion 80 is not connected to other hinge portions 12 and the main body portion 13. In other words, the wiring of the array layer 30 is not provided in the dummy portion 80. In addition, the dummy portion 80 overlaps with the imaginary line M in a plan view. In addition, the imaginary line M of the modification example 3 extends between the first base portion 523 for the central area extending from the main body portion 513 for the central area and the hinge portion 612 for the frame area.

[0104] Next, the effect of Modification 3 will be described. For example, when a tensile load in the second direction Y acts on the retractable device 100, there is a possibility that stress is concentrated on the boundary (the portion overlapping with the imaginary line M) between the first base 523 for the central region and the hinge 612 for the frame region, which have different rigidities. However, according to Modification 3, a dummy portion 80 is arranged at the boundary between the first base 523 for the central region and the hinge 612 for the frame region. As a result, the rigidity of the boundary becomes greater, and the situation in which stress is concentrated on the boundary between the first base 523 for the central region and the hinge 612 for the frame region is avoided.

[0105] The above describes the modification 3, but the shape of the dummy portion 80 is not particularly limited in the present disclosure. Fig. 9As shown, the dummy portion 81 may be a quadrangular dummy portion 81 or a circular dummy portion 82 in a plan view. Alternatively, the dummy portion 83 may be a combination of the frame region hinge portion 612 and the frame region main body portion 613.

Claims

1. A retractable device, characterized in that: have: a retractable substrate extending in a planar direction including a first direction and a second direction intersecting the first direction; and a pair of stretchable resin layers sandwiching the stretchable substrate from both sides in a stacking direction intersecting the planar direction, One of the pair of stretchable resin layers has a surface facing in an opposite direction to the stretchable substrate. When the surface is viewed from the stacking direction, The surface is divided into a central region located in the center of the surface and a frame region located at the edge of the surface and surrounding the central region. The retractable substrate has a resin base material and an array layer arranged in the stacking direction, The resin substrate has a hinge portion extending while meandering in the planar direction, The hinge portion has a plurality of arc portions formed in an arc shape when viewed from the stacking direction, The arc portion has: a central area arc portion disposed in the central area; and a frame area arc portion arranged in the frame area, The curvature radius of the frame area circular arc portion is smaller than the curvature radius of the central area circular arc portion.

2. The retractable device according to claim 1, characterized in that The frame area arc portion and the central area arc portion have similar shapes.

3. The retractable device according to claim 2, characterized in that The hinge has: a central region hinge portion, which is disposed in the central region and has a central region circular arc portion; and a frame region hinge portion, which is arranged in the frame region and has an arc portion for the frame region, The frame region hinge portion and the central region hinge portion have similar shapes.

4. The retractable device according to claim 3, characterized in that The resin base material has a plurality of main body parts connected to the ends of the plurality of hinge parts, The main body has: a central region main body, which is disposed in the central region and connected to the central region hinge; and a frame area main body, which is arranged in the frame area and connected to the frame area hinge, The frame area main body and the central area main body are similar in shape. The reduction ratio between the frame region hinge portion and the central region hinge portion is the same as the reduction ratio between the frame region body portion and the central region body portion.

5. The retractable device according to any one of claims 1 to 4, characterized in that The array layer has a plurality of wirings arranged in the frame region and extending in the circumferential direction outside the central region. The plurality of wirings include inner peripheral wirings and outer peripheral wirings arranged outside the inner peripheral wirings. The width of the outer peripheral wiring is greater than the width of the inner peripheral wiring.

6. The retractable device according to any one of claims 1 to 4, characterized in that The hinge portion includes a frame region hinge portion, the frame region hinge portion is arranged in the frame region and includes the frame region circular arc portion, A plurality of wirings extending along the frame region hinge portion are provided at one of the frame region hinge portions, The frame region hinge portion is provided with a slit that is disposed between the plurality of wirings when viewed from the stacking direction and divides the frame region hinge portion in a width direction.

7. A retractable device according to any one of claims 1 to 4, characterized in that The resin substrate has a dummy portion where no wiring is provided, When viewed from the stacking direction, the dummy portion overlaps with an imaginary line indicating a boundary between the central region and the frame region.

Images