Shoe

Abstract

A shoe (1A) is provided with a bed section (10A) that supports the sole of a wearer's foot and is provided with a ground contact surface (12). The footbed part (10A) comprises a buffer part (13), the buffer part (13) comprises an elastic material having an elastic modulus of 0.1 MPa to 100 MPa and is composed of a single member, and the buffer part (13) comprises a three-dimensional network structure in which a three-dimensional lattice structure in which a plurality of columnar parts are connected to each other is used as a unit structure, and a plurality of the unit structures are repeatedly arranged. Each of the plurality of columnar sections includes a columnar section having a maximum outer dimension of 1.0 mm or more and 1.8 mm or less in a cross-section orthogonal to the direction in which the columnar section extends, and the thickness of the buffer section (13) in the direction orthogonal to the ground plane (12) is 25.0 mm or more.

Description

Technical Field

[0001] The present invention relates to a shoe represented by a sandal or a shoe boot or an article equipped with an insole thereon. Background Art

[0002] For example, in Japanese Patent Laid-Open No. 2018-187363 (Patent Document 1), a shoe sole made by a three-dimensional stacking method is disclosed. The shoe sole disclosed in the publication includes a three-dimensional mesh structure with a three-dimensional lattice structure as a unit structure.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2018-187363 Summary of the invention

[0006] Problems to be solved by the invention

[0007] For example, in recovery shoes (recovery sandals) used for fatigue recovery by dispersing foot pressure, supporting the arch of the foot, supporting the heel from tilting due to so-called valgus, etc., the footbed portion is required to have high deformability. The high deformability does not simply mean that the footbed portion is made soft, but it must not produce bottoming (a state in which the footbed portion is compressed to the maximum extent and is not easily deformed further due to deformation when landing), and the foot of the wearer must be stably supported in the deformed state.

[0008] In order to realize such deformation capability, it is assumed that the cushioning part provided in the footbed part needs to be designed not only from the viewpoint of material but also from the viewpoint of structure, and therefore, as disclosed in the above-mentioned publication, the cushioning part is constituted by a three-dimensional mesh structure having a three-dimensional lattice structure as a unit structure. However, the sole disclosed in the above-mentioned publication is designed so as to ensure high durability or good wearing comfort for sports use, and no research is conducted from the viewpoint of suppressing bottoming.

[0009] Furthermore, the performance of having such high deformation ability, suppressing bottoming, and stably supporting the wearer's foot is not only required in the shoes for recovery purposes, but also required in shoes for other purposes depending on the occasion of use.

[0010] Therefore, the present invention has been made in view of such a situation, and an object of the present invention is to provide a shoe that does not cause bottoming when worn and can stably support the wearer's foot in a deformed state.

[0011] Technical means of solving problems

[0012] The shoe according to the present invention includes a footbed portion that supports the sole of the wearer's foot and is provided with a ground contact surface. The footbed portion includes a buffer portion, the buffer portion includes an elastic material having an elastic modulus of 0.1 MPa or more and 100 MPa or less and is composed of a single member, and the buffer portion includes a three-dimensional mesh structure formed by repeatedly arranging a plurality of unit structures and a three-dimensional lattice structure formed by connecting a plurality of columnar portions to each other as a unit structure. Each of the plurality of columnar portions includes a columnar portion having a maximum outer dimension of 1.0 mm or more and 1.8 mm or less in a cross section perpendicular to the extension direction thereof, and the thickness of the buffer portion in a direction perpendicular to the ground contact surface is 25.0 mm or more.

[0013] Effects of the Invention

[0014] According to the present invention, it is possible to provide a shoe which does not cause bottoming when worn and which can stably support the wearer's foot in a deformed state. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] [ Figure 1 ] is a stereoscopic view of the sandal of embodiment 1 viewed from the upper right front side.

[0016] [ Figure 2 ] is viewed from the lower left side and rear side Figure 1 A perspective view of the sandal shown.

[0017] [ Figure 3 ]yes Figure 1 Plan view of the sandal shown.

[0018] [ Figure 4 ] is viewed from the outside of the foot Figure 1 Side view of the sandal shown.

[0019] [ Figure 5 ] is used for Figure 1 Schematic diagram for explaining the three-dimensional structure of the cushioning portion of the sandal shown.

[0020] [ Figure 6 ] is to indicate Figure 1 The schematic diagram of the state at the beginning of shaping of the sandal body by the three-dimensional lamination shaping method in the manufacturing method of the sandal shown.

[0021] [ Figure 7 ] is to indicate Figure 1 The schematic diagram of the state of the mid-stage of shaping of the sandal body by the three-dimensional lamination shaping method in the manufacturing method of the sandal shown.

[0022] [ Figure 8 ] is to indicate Figure 1The schematic diagram of the state at the time of completion of the shaping of the sandal body by the three-dimensional lamination shaping method in the sandal manufacturing method shown.

[0023] [ Fig. 9 ] is to indicate Figure 1 A schematic diagram of another method for manufacturing a sandal is shown.

[0024] [ Fig.10 ] is to indicate Figure 1 The schematic diagrams shown are of the state of the sole of the sandal when it lands on the ground and when it takes a step.

[0025] [ Fig.11 ] is to indicate Figure 1 Schematic diagram of the thickness distribution of the columnar portion in the cushioning portion of the sandal shown.

[0026] [ Fig.12 ] is a graph showing the results of the first verification test.

[0027] [ Fig.13 ] is a graph showing the results of the second verification test.

[0028] [ Fig.14 ] is a schematic diagram showing the thickness distribution of the columnar portion in the cushioning portion of the sandal of the first variant.

[0029] [ Fig.15 ] is a schematic cross-sectional view of the footbed portion of the sandal of the second variant.

[0030] [ Fig.16 ] is a schematic cross-sectional view of the footbed portion of the sandal of the third variant.

[0031] [ Fig.17 ] is a schematic cross-sectional view of the footbed portion of the sandal of the fourth variant.

[0032] [ Fig.18 ] is a schematic diagram used to illustrate the three-dimensional structure of the cushioning portion of the sandal of the fifth variant.

[0033] [ Fig.19 ] is a three-dimensional diagram of the footwear of embodiment 2.

[0034] [ Fig. 20 ] is a three-dimensional diagram of the footwear of embodiment 3.

[0035] [ Fig.21 ] is along Fig. 20 Schematic cross-sectional view of line XXI-XXI shown in .

[0036] [ Fig. 22 ]yes Fig. 20 Exploded view of the footwear shown.

[0037] [ Fig.23 ] is a three-dimensional diagram of the footwear of embodiment 4 and the insole included in the footwear. DETAILED DESCRIPTION

[0038] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the embodiments shown below, the same or common parts are marked with the same symbols in the drawings, and their descriptions will not be repeated. In addition, the term "wearer" used in the following description refers to a person with a standard physique having a foot of a size suitable for this shoe.

[0039] <Implementation method 1>

[0040] Figure 1 This is a perspective view of the sandal of Embodiment 1 viewed from the upper right side. Figure 2 Observed from the left lower rear side Figure 1 A perspective view of the sandal shown. In addition, Figure 3 yes Figure 1 The plan view of the sandal shown, Figure 4 Observed from the outside of the foot Figure 1 First, refer to these Figures 1 to 4 , the structure of the sandal 1A according to the present embodiment will be described.

[0041] like Figures 1 to 4 As shown, the sandal 1A includes a sandal body 20 including a sole 21 and a shoelace 22. The sandal body 20 is composed of a single member and includes a structure 2 produced by a three-dimensional lamination method of a photolithography system described later.

[0042] The sole 21 forms a footbed portion 10A for supporting the wearer's foot. The upper surface 21a of the sole 21 defines a support surface 11 for supporting the sole of the wearer's foot when worn, and the lower surface 21b of the sole 21 defines a ground contact surface 12 for contacting the ground or floor surface when worn.

[0043] In the sandal 1A of this embodiment, the peripheral edge of the upper surface 21a side of the sole 21 is configured to be convex so as to position the wearer's foot on the support surface 11 when worn. Therefore, the upper surface 21a of the sole 21 has a concave shape as a whole, and the portion of the upper surface 21a that defines the bottom of the concave shape corresponds to the support surface 11.

[0044] The support surface 11 is preferably made of a non-slip and soft material for wearing comfort, and the ground contact surface 12 is preferably made of a non-slip material. In the sandal 1A of the present embodiment, since the support surface 11 and the ground contact surface 12 are formed by a part of the sandal body 20 as a single member, the support surface 11 and the ground contact surface 12 are both made of a non-slip and soft material. However, the support surface 11 and the ground contact surface 12 may be independently formed of members having different materials or hardness.

[0045] Here, in the sandal 1A of the present embodiment, the sole 21 as the footbed 10A is configured to be entirely soft, and thus the sole 21 as a whole functions as the cushioning portion 13. The cushioning portion 13 is not simply soft, but its performance is improved so that the wearer's foot can be stably supported in a deformed state without touching the bottom, and the details will be described later.

[0046] like Figure 3 and Figure 4 As shown, when viewed from above (i.e., viewed in a direction perpendicular to the ground contact surface 12), the sole 21 of the sandal 1A extends in a front-to-back direction (ie, in a direction perpendicular to the ground contact surface 12) that is consistent with the length direction of the wearer's foot. Figure 3 In the figure, the up and down directions, Figure 4 The front foot portion R1 (in the left-right direction in the figure) is divided into a toe portion and a stepping portion supporting the wearer's foot, a midfoot portion R2 supporting a non-stepping portion of the wearer's foot, and a rear foot portion R3 supporting a heel portion of the wearer's foot.

[0047] Here, with the front end of the sole 21 as a reference, and a position at a size equivalent to 30% of the size of the sole 21 in the front-to-back direction from the front end as the first boundary position, and a position at a size equivalent to 80% of the size of the sole 21 in the front-to-back direction from the front end as the second boundary position, the front foot R1 is equivalent to the portion included between the front end and the first boundary position along the front-to-back direction, the midfoot R2 is equivalent to the portion included between the first boundary position and the second boundary position along the front-to-back direction, and the rear foot R3 is equivalent to the portion included between the second boundary position and the rear end of the shoe sole along the front-to-back direction.

[0048] In addition, if Figure 3 As shown, when viewed from above, the sandal 1A is divided into a portion on the inner foot side (the portion on the S1 side shown in the figure) corresponding to the median side in the anatomical position of the foot (i.e., the side close to the center) and a portion on the outer foot side (the portion on the S2 side shown in the figure) corresponding to the side opposite to the median side in the anatomical position of the foot (i.e., the side away from the center) along the left-right direction (left-right direction in the figure) consistent with the width direction of the wearer's foot.

[0049] like Figures 1 to 4 As shown, the shoelace 22 constitutes a foot cover 10B that covers the instep of the wearer's foot, and is located above the sole 21. In the sandal 1A of the present embodiment, the shoelace 22 has a strap-like shape.

[0050] The shoelace 22 extends in the left-right direction in a substantially mountain-shaped manner when viewed in the front-back direction. One end of the shoelace 22 is connected to the inner foot side end of the sole 21, and the other end of the shoelace 22 is connected to the outer foot side end of the sole 21.

[0051] Thus, the shoe opening 23 is formed by the peripheral edge of the upper surface 21a of the sole 21 located further rearward than the shoelace 22 and the rear end of the shoelace 22, and a hollow portion is provided between the sole 21 and the shoelace 22. Therefore, the wearer's foot is inserted into the hollow portion through the shoe opening 23, thereby being able to wear the sandal 1A.

[0052] Furthermore, in the sandal 1A of this embodiment, in addition to the shoe opening 23, a front opening 24 is formed by the peripheral edge of the upper surface 21a of the sole 21 located further forward than the shoelace 22 and the front end of the shoelace 22. When worn, the toe of the wearer's foot is exposed to the outside through the front opening 24.

[0053] The material of the sandal body 20 is not particularly limited, but is preferably a material that can be formed by a three-dimensional stacking method of optical forming, and is a resin material or a rubber material, so that the sandal body 20 after forming has corresponding softness, ductility, durability, elasticity, stability, etc. More specifically, when the sandal body 20 is made of resin, for example, it can be made of polyolefin resin, ethylene vinyl acetate copolymer (ethylene vinylacetate, EVA), polyamide thermoplastic elastomer (TPA (thermoplastic polyamide), TPAE (thermoplastic polyamide elastomer)), thermoplastic polyurethanes (thermoplastic polyurethanes, TPU), polyester thermoplastic elastomer (thermoplastic polyeher ester elastomer, TPEE). On the other hand, when the sandal body 20 is made of rubber, for example, it can be made of butadiene rubber (BR).

[0054] The sandal body 20 may include a polymer composition. In this case, examples of the polymer contained in the polymer composition include olefin polymers such as olefin elastomers and olefin resins. Examples of the olefin polymer include polyethylene (e.g., linear low-density polyethylene (LLDPE), high-density polyethylene (HDPE), etc.), polypropylene, ethylene-propylene copolymers, propylene-1-hexene copolymers, propylene-4-methyl-1-pentene copolymers, propylene-1-butene copolymers, ethylene-1-hexene copolymers, ethylene-4-methyl-pentene copolymers, ethylene-1-butene copolymers, 1-butene-1-hexene copolymers, 1-butene-4-methyl-pentene, ethylene-methacrylic acid copolymers, ethylene-methyl methacrylate copolymers, ethylene-ethyl methacrylate copolymers, ethylene-butyl methacrylate copolymers, ethylene-methyl acrylate copolymers, ethylene-ethyl acrylate copolymers, ethylene-butyl acrylate copolymers, propylene-methacrylic acid copolymers, propylene-methyl methacrylate copolymers, propylene-ethyl methacrylate copolymers, propylene-butyl methacrylate copolymers, propylene-methyl acrylate copolymers, propylene-ethyl acrylate copolymers, propylene-butyl acrylate copolymers, ethylene-vinyl acetate copolymers, and propylene-vinyl acetate copolymers.

[0055] The polymer may be an amide polymer such as an amide elastomer or an amide resin. Examples of the amide polymer include polyamide 6, polyamide 11, polyamide 12, polyamide 66, and polyamide 610.

[0056] The polymer may be an ester polymer such as an ester elastomer or an ester resin. Examples of the ester polymer include polyethylene terephthalate and polybutylene terephthalate.

[0057] The polymer may be a urethane polymer such as a urethane elastomer or a urethane resin. Examples of the urethane polymer include polyester polyurethane and polyether polyurethane.

[0058] Furthermore, the polymer may be, for example, a styrene-based polymer such as a styrene-based elastomer or a styrene-based resin. Examples of the styrene-based elastomer include styrene-ethylene-butadiene copolymer (SEB), styrene-butadiene-styrene copolymer (SBS), hydrogenated SBS (styrene-ethylene-butylene-styrene copolymer (SEBS)), styrene-isoprene-styrene copolymer (SIS), hydrogenated SIS (styrene-ethylene-propylene-styrene copolymer (SEPS)), styrene-isobutylene-styrene copolymer (SIBS), styrene-butadiene-styrene-butadiene (SBSB), styrene-butadiene- ... Styrene (SBSBS), etc. Examples of the styrene-based resin include polystyrene, acrylonitrile styrene resin (AS), and acrylonitrile butadiene styrene resin (ABS).

[0059] In addition, the polymer may be, for example, an acrylic polymer such as polymethyl methacrylate, a urethane acrylic polymer, a polyester acrylic polymer, a polyether acrylic polymer, a polycarbonate acrylic polymer, an epoxy acrylic polymer, a conjugated diene polymer acrylic polymer and a hydrogenated product thereof, a urethane methacrylic polymer, a polyester methacrylic polymer, a polyether methacrylic polymer, a polycarbonate methacrylic polymer, a polyester urethane acrylate, a polycarbonate urethane acrylate, a polyether urethane acrylate, an epoxy methacrylic polymer, a conjugated diene polymer methacrylic polymer and a hydrogenated product thereof, a polyvinyl chloride resin, a silicone elastomer, butadiene rubber, isoprene rubber (IR), chloroprene rubber (CR), natural rubber (NR), styrene butadiene rubber (SBR), acrylonitrile butadiene rubber (NBR), butyl rubber (IIR), and the like.

[0060] As described above, the sandal body 20 preferably includes a material that exhibits non-slip and soft wearing comfort, and therefore, among the types of materials, it is particularly preferred to include urethane acrylate. When the sandal body 20 includes urethane acrylate, it not only has excellent durability and ductility, but also has sufficient elasticity. In addition, as described above, since the sandal body 20 is manufactured by a three-dimensional lamination molding method of a photoforming method, a hardener is included in the sandal body 20 as a secondary component.

[0061] Here, the sandal 1A of this embodiment can achieve the improvement of its performance not only in terms of the material as described above, but also in terms of the structure. More specifically, in the sandal 1A, the sole 21 as the footbed 10A that functions as the cushioning part 13 includes a three-dimensional mesh structure as described later, and is configured so that the three-dimensional mesh structure of the part constituting the cushioning part 13 satisfies the predetermined shape or size conditions without bottoming out and can stably support the wearer's foot in a deformed state.

[0062] Below, refer to Figure 5 (A) and Figure 5 (B) and Figure 4 This aspect is described in detail. Here, Figure 5 (A) is used for Figure 1 The schematic diagram for explaining the three-dimensional structure of the cushioning part of the sandal shown in FIG. Figure 5 (B) is used to Figure 5 (A) is a schematic diagram for explaining the three-dimensional structure of the buffer portion having the structure shown.

[0063] like Figure 5 As shown in (A), the sole 21 of the sandal 1A that functions as the cushioning part 13 includes a three-dimensional mesh structure 3A formed by repeatedly arranging a plurality of unit structures 4A including a three-dimensional lattice structure. More specifically, the plurality of unit structures 4A are regularly and continuously arranged repeatedly in the width direction (the X direction shown in the figure), the depth direction (the Y direction shown in the figure), and the height direction (the Z direction shown in the figure). Figure 5 In (A), only a number of unit structures 4A adjacent to each other in the width direction, the depth direction, and the height direction are extracted and shown.

[0064] The unit structure 4A including the three-dimensional lattice structure has a three-dimensional shape formed by connecting a plurality of columnar portions 6 extending in a predetermined direction. These plurality of columnar portions 6 are configured so that adjacent columnar portions 6 intersect with their extending directions, thereby forming a three-dimensional lattice structure. The illustrated unit structure 4A is called a fluorite-type lattice. In addition, the unit space 5A occupied by the unit structure 4A has a polyhedral shape, and in the illustrated unit structure 4A, it is a hexahedral shape.

[0065] exist Figure 5 In the three-dimensional net structure 3A shown in (A), each of the multiple columnar portions 6 is configured to have a roughly cylindrical outer shape. Therefore, the cross-sectional shape orthogonal to the extension direction of each of the multiple columnar portions 6 is roughly circular. In addition, in the three-dimensional net structure 3A shown in the figure, the thickness of each of the multiple columnar portions 6 is configured to change continuously along its extension direction, specifically, it is configured to have a large thickness in the connecting portion with the adjacent columnar portion 6, and as it is away from the connecting portion, its thickness decreases. If so constituted, it is possible to improve its durability while maintaining flexibility.

[0066] on the other hand, Figure 5 The three-dimensional network structure 3A' shown in (B) includes a Figure 5 The three-dimensional structure of the structure shown in (A) is that the unit structure 4A' is a fluorite-type lattice, and the unit space 5A' occupied by the unit structure 4A' is a hexahedral shape. However, in the three-dimensional network structure 3A', Figure 5 (A) is different from the structure shown in that the thickness of each of the plurality of columnar portions 6 is uniform along the extending direction thereof. Figure 5 The three-dimensional network structure 3A shown in (A) is applied to the cushioning portion 13 of the sandal 1A of the present embodiment.

[0067] In addition, as the unit structure 4A, unit structures of various structures can be used, for example, a rectangular parallelepiped lattice, a diamond lattice, an octahedral lattice, a double pyramid lattice, or various structures in which various supports are added to these lattices.

[0068] Here, in the sandal 1A of the present embodiment, the buffer portion 13 includes an elastic material having an elastic modulus of 0.1 MPa or more and 100 MPa or less. With such a configuration, when a load is applied to the buffer portion 13 (i.e., when landing or taking a step, etc.), the buffer portion 13 exerts a high buffering performance and can effectively disperse the foot pressure. In addition, in order to more reliably obtain a high buffering performance, the elastic modulus of the material constituting the buffer portion 13 may also be set to be 1 MPa or more and 50 MPa or less.

[0069] In the sandal 1A of the present embodiment, the maximum outer dimension of each of the plurality of columnar portions 6 in a cross section perpendicular to the extending direction thereof is set to be 1.0 mm or more and 1.8 mm or less, and the thickness T of the cushioning portion 13 in a direction perpendicular to the ground contact surface 12 (see Figure 4 ) is set to 25.0 mm or more. By satisfying these conditions, a sandal can be made that does not touch the bottom and can stably support the wearer's foot in a deformed state. Figure 4 In the figure, for the convenience of drawing, the thickest part of the sole 21 serving as the buffer portion 13 is marked with a symbol T representing its thickness. However, in the sandal 1A of this embodiment, even in the buffer portion 13 which is the smallest thickness, the condition that the thickness is greater than 25.0 mm is satisfied.

[0070] Here, when the thickness of each of the plurality of columnar portions 6 is so large that it exceeds the maximum outer dimension of the range, the rigidity of the buffer portion 13 becomes higher than necessary, and the required deformation capacity cannot be provided to the buffer portion 13. On the other hand, when the thickness of each of the plurality of columnar portions 6 is smaller than the maximum outer dimension of the range, the rigidity of the buffer portion 13 is significantly reduced, and bottoming may occur. In addition, when the thickness of each of the plurality of columnar portions 6 is smaller than the maximum outer dimension of the range, the durability may be poor, or it may be difficult to manufacture by the three-dimensional stacking method.

[0071] Furthermore, if the thickness T of the buffer portion 13 in the direction perpendicular to the ground contact surface 12 is smaller than the above range, when a load is applied to the buffer portion 13 (i.e., when landing, taking a step, standing, etc.), a sufficient deformation margin for deformation of the buffer portion 13 cannot be ensured, resulting in a high possibility of bottoming out.

[0072] In addition, these conditions are conditions derived based on the results of the first verification test and the second verification test described later. The following aspects will be described in detail later, namely, by satisfying the above conditions, there will be no bottoming out when worn and the wearer's feet can be stably supported in a deformed state.

[0073] Figures 6 to 8 Yes means Figure 1 The schematic diagram of the manufacturing method of the sandal shown in FIG. 1 shows the state at the beginning, the state in the middle and the state at the end of the shaping of the sandal body based on the three-dimensional stacking shaping method. Figures 6 to 8 , a specific manufacturing method when manufacturing the sandal 1A of this embodiment will be described.

[0074] As described above, in the sandal 1A of the present embodiment, the sandal body 20 including the sole 21 and the shoelace 22 is composed of a single member shaped object 2 made by a three-dimensional lamination method using a photolithography method. Figures 6 to 8 The three-dimensional stacking formation device 100 shown in the figure is used for formation.

[0075] The three-dimensional stacking forming device 100 is a device for producing a formed object by a three-dimensional stacking forming method of light forming. Here, the three-dimensional stacking forming method of light forming is a forming method of a desired shape of a formed object using a light-curable liquid resin or liquid rubber that is hardened by light of a specific wavelength as a main raw material, and by irradiating the light of the specific wavelength to sequentially stack the hardened parts. As the light of the specific wavelength, for example, ultraviolet rays can be used. In the case, ultraviolet curing resin or rubber can be used as the main raw material. In addition, the liquid resin or liquid rubber as the main raw material is not limited to a single liquid, and can also be a two-liquid, etc.

[0076] like Figures 6 to 8 As shown, the three-dimensional stacking forming device 100 includes a light source (not shown), a storage tank 101, a platform 102 and a lifting mechanism 103. The storage tank 101 is a part for storing liquid resin 200 as a raw material, etc. The platform 102 is used to hold and move the formed object 2. The lifting mechanism 103 is used to move the platform 102 in the up and down direction.

[0077] like Figure 6As shown, in the three-dimensional layered forming apparatus 100, first, the stage 102 is moved by the lifting mechanism 103, thereby setting the lower surface of the stage 102 to a state in contact with the liquid surface of the liquid resin 200, etc., and in this state, light of a specific wavelength emitted from a light source is irradiated so as to draw a predetermined pattern near the liquid surface of the liquid resin 200, etc., thereby performing exposure. As a result, the liquid resin 200, etc. located near the liquid surface is cured in a layered state while adhering to the lower surface of the stage 102, thereby forming a first cured layer.

[0078] Next, the stage 102 is moved upward (i.e., in the direction of arrow DR1 in the figure) by a predetermined amount by the lifting mechanism 103, and the lower surface of the first hardened layer is placed in contact with the liquid surface of the liquid resin 200, etc. In this state, light of a specific wavelength emitted from a light source is irradiated so as to draw a predetermined pattern near the liquid surface of the liquid resin 200, etc., thereby performing exposure. As a result, the liquid resin 200, etc. located near the liquid surface is cured in a layered state while adhering to the lower surface of the first hardened layer, thereby forming a second hardened layer.

[0079] By repeating the same process as the process for forming the second hardened layer (ie, the process of moving the stage 102 and the process of exposing the liquid resin 200, etc.), Figure 7 As shown, a plurality of hardened layers are stacked in order downward (ie, in the direction of arrow DR2 shown in the figure), thereby forming the sandal body 20. During the forming process, the sole 21 and the shoelace 22 are formed next.

[0080] Then, if Figure 8 As shown, after all parts of the sandal body 20 are formed, the platform 102 is further lifted upward by the lifting mechanism 103, so that the sandal body 20 is separated from the liquid resin 200 stored in the storage tank 101, and is taken out from the three-dimensional layered forming device 100. Here, the sandal body 20 after forming is not fully hardened yet and is in a relatively soft state. Therefore, the taken out sandal body 20 is separately cleaned and heat-treated to be fully hardened, and then cleaned and dried, thereby completing the production of the sandal 1A.

[0081] As described above, in the manufacturing method of the sandal 1A of the present embodiment, the sole 21 is formed by laminating in sequence from the ground contact surface 12 side along the direction perpendicular to the ground contact surface 12 by the three-dimensional laminating method of the photoforming method, and then the shoelace portion 22 is formed by laminating in sequence. That is, in the manufacturing method of the sandal 1A of the present embodiment, the direction perpendicular to the ground contact surface 12 of the sandal 1A coincides with the direction (that is, the direction of the arrow DR2 shown in the figure) in which the sandal 1A is formed by laminating in sequence a plurality of hardened layers.

[0082] Fig. 9 Yes means Figure 1 The schematic diagram of another method for manufacturing the sandals shown in FIG. Fig. 9 Another specific manufacturing method for manufacturing the sandal 1A according to the present embodiment will be described.

[0083] like Fig. 9 As shown, another method for manufacturing the sandal 1A of this embodiment is similar to the method for manufacturing the sandal 1A of this embodiment (ie, referring to Figures 6 to 8 Similarly to the manufacturing method of the sandal 1A described in the above embodiment, the sandal 1A is manufactured by manufacturing the sandal body 20 including a single member by a three-dimensional stacking molding method using the three-dimensional stacking molding apparatus 100. However, the direction of stacking the sandal body 20 in another manufacturing method of the sandal 1A of the present embodiment is different from that in the manufacturing method of the sandal 1A of the present embodiment.

[0084] Specifically, in another method of manufacturing the sandal 1A of the present embodiment, a three-dimensional stacking molding method using a photoforming method is used to form a plurality of sandals 1A along the front-back direction from the front foot portion R1 (see Figure 3 , Figure 4 etc.) side toward the rear foot R3 (refer to Figure 3 , Figure 4 That is, in another method of manufacturing the sandal 1A of the present embodiment, the front-back direction of the sandal body 20 coincides with the direction in which the plurality of hardened layers are sequentially stacked (the direction of arrow DR2 shown in the figure).

[0085] In addition, when another manufacturing method of the sandal 1A of the present embodiment is adopted, due to the relationship between the shape of the sandal body 20 to be formed and the posture (i.e., orientation) of the sandal body 20 during its forming, it is necessary to form a sandal body 20 independently of the sandal body 20. Fig. 9 The support portion 2' shown is provided so that the shape of the relatively soft sandal body 20 can be maintained during the shaping. The support portion 2' is cut and removed from the sandal body 20 after the sandal body 20 is shaped.

[0086] Fig.10 (A) and Fig.10 (B) respectively represent Figure 1 The schematic diagram of the state of the sole of the sandal when landing and walking is shown in FIG. Fig.10 (A) and Fig.10 (B) The performance of the cushioning portion 13 of the sandal 1A of this embodiment will be described. Fig.10 (A) and Fig.10 In (B), the shoelace portion 22 is omitted from illustration.

[0087] As described above, in the sandal 1A of the present embodiment, the sole 21 includes the buffer portion 13, the buffer portion 13 includes an elastic material having an elastic modulus of 0.1 MPa or more and 100 MPa or less and is composed of a single member, the buffer portion 13 includes a three-dimensional mesh structure 3A in which a plurality of columnar portions 6 are connected to each other and a three-dimensional grid structure is formed by repeatedly arranging a plurality of the unit structures 4A, each of the plurality of columnar portions 6 includes a columnar portion having a maximum outer dimension in a cross section perpendicular to the extension direction thereof (in the present embodiment, each of the plurality of columnar portions 6 is substantially cylindrical, so the maximum outer dimension is equal to the diameter) of 1.0 mm or more and 1.8 mm or less, and a thickness T of the buffer portion 13 in a direction perpendicular to the ground contact surface 12 (refer to Figure 4 ) is set to 25.0 mm or more.

[0088] By meeting these conditions, such as Fig.10 As shown in (A), when landing, the sole 21 (i.e., the cushioning portion 13) undergoes a large deformation in the portion of the sole 21 where the maximum load is applied, i.e., the portion corresponding to the heel 304 of the wearer's foot 300 (i.e., the portion from the rear end side of the midfoot R2 to the front end of the rear foot R3), and accordingly, the upper surface 21a of the sole 21 serving as the support surface 11 is displaced toward the lower surface 21b serving as the ground contact surface 12, thereby causing the heel 304 of the wearer's foot 300 to sink.

[0089] At this time, by fully ensuring the softness and thickness of the cushioning part 13, bottoming will not occur (when landing, the sole 21 is deformed and is compressed to the maximum extent, and it is not easy to deform further), and the wearer's foot pressure will be dispersed, and the wearer feels soft stepping comfort.

[0090] In addition, compared with the portion of the sole 21 corresponding to the heel 304 of the wearer's foot 300, a large load is not applied to the portion of the sole 21 corresponding to the non-stepping portion 303 of the wearer's foot 300. Therefore, the portion of the sole 21 corresponding to the heel 304 of the wearer's foot 300 is partially deformed to a large extent. Accordingly, the heel 304 of the wearer's foot 300 that has sunk is maintained in a manner wrapped by the sole 21. Even when the sole 21 is deformed, the wearer's foot 300 is stably supported.

[0091] On the other hand, Fig.10As shown in (B), when taking a step, the sole 21 (i.e., the cushioning portion 13) undergoes a large deformation in the portion of the sole 21 where the greatest load is applied, i.e., the portion corresponding to the stepped portion 302 of the wearer's foot 300 (i.e., the portion from the rear end portion of the forefoot R1 to the front end side of the midfoot R2), and accordingly, the upper surface 21a of the sole 21 serving as the support surface 11 is displaced toward the lower surface 21b serving as the ground contact surface 12, thereby causing the stepped portion 302 of the wearer's foot 300 to sink.

[0092] At this time, by ensuring sufficient softness and thickness of the cushioning portion 13, bottoming does not occur, and the wearer's foot pressure is dispersed, so that the wearer can feel soft and comfortable stepping.

[0093] In addition, compared with the portion of the sole 21 corresponding to the treading portion 302 of the wearer's foot 300, a large load is not applied to the portion of the sole 21 corresponding to the toe portion 301 and the non-treading portion 303 of the wearer's foot 300. Therefore, the portion of the sole 21 corresponding to the treading portion 302 of the wearer's foot 300 is partially deformed to a large extent. Accordingly, the treading portion 302 of the sunken wearer's foot 300 is held in a manner wrapped by the sole 21. Even when the sole 21 is deformed, the wearer's foot 300 is stably held.

[0094] In addition, although it is omitted in the figure, when standing, the sole 21 (i.e., the cushioning portion 13) is greatly deformed in the portion of the sole 21 where the largest load is applied, i.e., the portion corresponding to the stepping portion 302 of the wearer's foot 300 and the portion corresponding to the heel 304 of the wearer's foot 300, so that the stepping portion 302 and the heel 304 of the wearer's foot 300 sink. In this case, the bottoming does not occur, the wearer feels soft stepping comfort, and the stepping portion 302 and the heel 304 of the wearer's foot 300 that sink are held in a manner wrapped by the sole 21, so that the wearer's foot 300 is stably supported.

[0095] This level of pedaling comfort (wearing comfort) is unprecedented and unique, and is particularly suitable for recovery or relaxation purposes such as fatigue recovery based on dispersing foot pressure, support of the arch of the foot, and support for the tilting of the heel called valgus.

[0096] As described above, according to the sandal 1A of the present embodiment, it is possible to obtain a sandal that does not cause the wearer's foot to touch the bottom when the wearer is worn and that can stably support the wearer's foot in a deformed state.

[0097] Here, from the viewpoint of ensuring sufficient deformation margin for deformation of the buffer portion 13, it is preferable that the space factor of the buffer portion 13 be 10% to 45% in addition to configuring the thickness T of the buffer portion 13 in the direction perpendicular to the ground contact surface 12 to be 25.0 mm or more as described above. With such a configuration, a corresponding space is formed inside the buffer portion 13, so that deformation of the columnar portion 6 can be promoted, and high deformation capacity can be ensured.

[0098] Furthermore, if the length of one side of the unit space 5A, which is a polyhedral space occupied by each unit structure 4A, is set to be greater than 3.0 mm and less than 20.0 mm, foreign matter is less likely to enter the interior of the buffer portion 13, thereby preventing the deformation capability from being hindered by the entry of foreign matter.

[0099] Furthermore, if a three-dimensional lattice structure is adopted as the unit structure 4A in which any of the plurality of columnar portions 6 included therein does not extend parallel to a direction orthogonal to the ground contact surface 12, buckling of the columnar portions 6 can be suppressed even when a load is applied, thereby helping to ensure high deformation capacity and prevent bottoming.

[0100] Furthermore, the maximum outer dimensions of each of the plurality of columnar portions 6 in a cross section perpendicular to the extension direction may be the same in the entire region of the cushioning portion 13, or may be different in each portion of the sole 21. In the sandal 1A of the present embodiment, the maximum outer dimensions are non-uniform in each portion of the sole 21, and are specifically configured to have a distribution within a range of 1.0 mm to 1.8 mm.

[0101] Fig.11 Yes means Figure 1 Schematic diagram of the thickness distribution of the columnar portion in the cushioning portion of the sandal shown in FIG. Fig.11 Next, the thickness distribution of the columnar portion 6 of the cushioning portion 13 in the sandal 1A of the present embodiment will be described.

[0102] like Fig.11 As shown, in the sandal 1A, in an area of ​​the sole 21 serving as the cushioning portion 13 including a portion of the sole corresponding to the metatarsophalangeal (MP) joint of the wearer (the portion indicated by the symbol MP in the figure), that is, an area approximately in the center in the front-to-back direction of the forefoot R1, the thickness of the columnar portion 6 is configured to be smaller than the thickness of the columnar portion 6 in the adjacent area.

[0103] On the other hand, in an area of ​​the sole 21 that includes a portion of the sole corresponding to the heel portion that supports the wearer, i.e., an area approximately in the center in the width direction from the rear end of the midfoot portion R2 to the front end of the rear foot portion R3, the thickness of the columnar portion 6 is configured to be larger than the thickness of the columnar portion 6 in the area adjacent to it in the front-to-back direction, and further, the thickness of the columnar portion 6 in the two outer areas in the width direction from the rear end of the midfoot portion R2 to the front end of the rear foot portion R3 is configured to be larger than the thickness of the columnar portion 6 in the area approximately in the center in the width direction.

[0104] With such a structure, a sandal can be made that not only can it flexibly support the sole of the wearer's foot corresponding to the MP joint and the sole of the heel, but it can also hold the sole of the heel that needs to be held more stably than the sole of the wearer's foot corresponding to the MP joint, thereby providing excellent wearing comfort. Not only that, it also helps to maintain the shape of the sandals.

[0105] Fig.12 is a graph showing the results of the first verification test, Fig.13 is a graph showing the results of the second verification test. Fig.12 and Fig.13 The first verification test and the second verification test will be described to confirm the extent of the influence on the deformation ability or bottoming of the buffer portion 13 when the structure of the buffer portion 13 is changed.

[0106] In both the first verification test and the second verification test, various samples based on the configuration of the buffer portion 13 are actually manufactured and tested, and the correlation between the load and the strain energy of the samples is measured by compressing the samples using a compression tester.

[0107] exist Fig.12 In the first verification test shown, various changes were made to the diameter of the columnar portion included in the unit structure constituting the buffer portion, and other conditions remained unchanged. The size and shape of the buffer portion were set to a rectangular parallelepiped shape with a dimension of 35.0 mm in the direction of the applied load and a dimension of 50.0 mm in the two axial directions orthogonal thereto. In addition, the diameter of the columnar portion included in the unit structure was set to 1.6 mm, 1.4 mm, 1.2 mm, 1.1 mm, 1.0 mm, and 0.9 mm in the order of Verification Examples 1 to 6.

[0108] Here, when the buffer portion bottoms out, the load that increases with the increase in strain energy becomes significantly greater than the previous load increase. Fig.11 In the graph shown in , it appears as the inflection point of the load-strain energy curve.

[0109] From the above point of view, when the results of the first verification test are confirmed, it can be seen that in Verification Example 6 in which the diameter of the columnar portion is 0.9 mm, the inflection point is found earlier (i.e., at a smaller strain energy) compared to Verification Examples 1 to 5 in which the diameter of the columnar portion is larger. The strain energy accumulated on the sole when landing is about 1.0 J at most, and as a result, the strain energy when the inflection point is found in Verification Example 6 is less than 1.0 J, and there is a concern that bottoming may occur during normal use. In contrast, in Verification Examples 1 to 5 in which the diameter of the columnar portion is more than 1.0 mm, no inflection point is generated when it is less than 1.0 J, and it can be seen that the occurrence of bottoming can be effectively suppressed.

[0110] On the other hand, when the diameter of the columnar portion exceeds 1.8 mm, the rigidity of the buffer portion becomes high, and there is a concern that the flexibility may be reduced. Therefore, based on the results of the first verification test, it can be understood that by setting the diameter of the columnar portion (i.e., the maximum outer dimension of each of the plurality of columnar portions 6 in a cross section perpendicular to the extension direction) to 1.0 mm or more and 1.8 mm or less, a buffer portion that does not touch the bottom when worn and has excellent deformation ability can be produced.

[0111] exist Fig.13 In the second verification test shown, various changes were made to the thickness of the buffer portion, and other conditions remained unchanged. The size and shape of the buffer portion were set to a rectangular parallelepiped shape with the dimensions of 50.0 mm in the two axial directions orthogonal to the direction of the applied load. In addition, the thickness of the buffer portion was set to 40.0 mm, 35.0 mm, 30.0 mm, 25.0 mm, 20.0 mm, and 15.0 mm in the order of Verification Examples 7 to 12. In addition, the diameter of the columnar portion contained in the unit structure constituting the buffer portion was set to 1.2 mm.

[0112] When confirming the results of the second verification test, in Verification Examples 11 and 12, where the thickness of the buffer portion was 20.0 mm and 15.0 mm, it was found that the strain energy at the inflection point was less than 1.0 J, and there was a concern that bottoming would occur during normal use. In contrast, in Verification Examples 7 to 10, where the thickness of the buffer portion was 25.0 mm or more, no inflection point occurred when the strain energy was less than 1.0 J, which indicates that bottoming can be effectively suppressed.

[0113] Therefore, based on the results of the second verification test, it can be understood that by setting the thickness of the cushioning portion 13 to 25.0 mm or more, a cushioning portion having excellent deformability and no bottoming during wear can be obtained.

[0114] In the sandal 1A of the present embodiment described above, the following situation is illustrated for explanation, in which the sole 21 as a whole as the footbed portion 10A satisfies the predetermined conditions (i.e., the basic structure of the three-dimensional network structure constituting the sole 21 or the elastic modulus of the material constituting the sole 21, the maximum outer dimensions of each of the plurality of columnar portions included in the sole 21 in a cross section perpendicular to the extension direction, the thickness of the sole 21 in a direction perpendicular to the ground contact surface, etc.), and the sole 21 as a whole is constituted as the buffer portion 13. However, it is not necessarily necessary for the sole 21 as a whole to be constituted as the buffer portion 13 satisfying the predetermined conditions, and only a part of the sole 21 may be constituted as the buffer portion 13.

[0115] Here, the part of the sole 21 that is easy to touch the bottom is the part where the load applied to the sole 21 becomes large when landing, walking, standing, etc. Therefore, even if the buffer part 13 is provided only in such a part or only in a part of such a part, the corresponding effect can be obtained. Based on the above viewpoint, for example, in the part of the sole 21 that supports the toe of the wearer's foot and the part where the load applied is relatively small, the thickness can be set to 25.0 mm or less, or the basic structure of the three-dimensional mesh structure constituting the part can be made different from the above structure, etc., and its structure can be changed in various ways.

[0116] As an example, as a reference for the portion of the sole 21 where the buffer portion 13 should be arranged, if it is taken into account that the overall load applied to the sole 21 when standing on both feet is approximately less than 500N, and the pressure of the portion where the highest pressure is applied at this time is approximately 200kPa, then, for example, the following structure can be adopted, that is, the buffer portion 13 is arranged only in the portion where a pressure of more than 150kPa is frequently applied, or the buffer portion 13 is arranged only in the portion where a pressure of more than 100kPa is frequently applied.

[0117] In this way, the portion that satisfies the predetermined conditions and constitutes the buffer portion 13 only needs to be provided on at least a portion of the sole 21 as the footbed portion 10A, and the entire sole 21 does not necessarily need to satisfy the predetermined conditions. In addition, the second to fourth modified examples described later specifically illustrate the case where only a portion of the sole 21 is constituted as the buffer portion 13 as described above.

[0118] <First Modification>

[0119] Fig.14 Schematic diagram showing the thickness distribution of the columnar portion in the cushioning portion of the sandal of the first modified example. Fig.14 , a sandal 1A1 according to a first modified example of the first embodiment will be described.

[0120] like Fig.14As shown, when the sandal 1A1 according to the first modification is compared with the sandal 1A according to the first embodiment, the difference in configuration is only in the thickness distribution of the columnar portion 6 of the cushioning portion 13 .

[0121] Specifically, in Fig.14 In the sandal 1A1 of the first variant shown, in the area of ​​the sole 21 serving as the buffer portion 13, which includes a portion of the sole of the wearer corresponding to the MP joint (the portion represented by the symbol MP in the figure), that is, in the area near the rear end of the forefoot R1, the thickness of the columnar portion 6 is larger than the thickness of the columnar portion 6 in the adjacent area.

[0122] With such a structure, a sandal can be made that not only can it flexibly support the sole of the wearer's foot corresponding to the MP joint and the sole of the heel, but it can also stably hold them, and the sandal has excellent wearing comfort. Not only that, it also helps to maintain the shape of the sandal, thereby also making it excellent in durability.

[0123] Therefore, in the case of the sandal 1A1 according to the first modification, the sandal can obtain the effects described in the first embodiment, and can stably support the wearer's foot without bottoming out and in a deformed state.

[0124] <Second to Fourth Modifications>

[0125] Figures 15 to 17 The following are schematic cross-sectional views of the footbed of the sandal according to the second to fourth variants. Figures 15 to 17 , sandals 1A2 to 1A4 according to second to fourth modified examples of the first embodiment will be described.

[0126] like Figures 15 to 17 As shown, the sandals 1A2 to 1A4 of the second to fourth modified examples differ in their configurations only in the position of the cushioning portion 13 provided in the footbed portion 10A when compared with the sandal 1A of the first embodiment. More specifically, in the sandal 1A of the first embodiment, the entire footbed portion 10A is configured as the cushioning portion 13, but in the sandals 1A2 to 1A4 of the second to fourth modified examples, the cushioning portion 13 is partially provided in the footbed portion 10A.

[0127] Specifically, in Fig.15 In the sandal 1A2 of the second variant shown, the cushioning portion 13 is provided only in the portion of the footbed portion 10A corresponding to the heel portion 304 of the wearer's foot 300 (i.e., from the rear end side portion of the midfoot portion R2 to the front end portion of the rearfoot portion R3).

[0128] On the other hand, Fig.16 In the sandal 1A3 of the third variant shown, the buffer portion 13 is separately and independently arranged in the portion corresponding to the stepping portion 302 of the wearer's foot 300 (i.e., the portion from the rear end portion of the forefoot portion R1 to the front end side of the midfoot portion R2) and the portion corresponding to the heel portion 304 of the wearer's foot 300 in the shoe bed portion 10A.

[0129] In addition, Fig.17 In the sandal 1A4 of the fourth variant shown, the buffer portion 13 is arranged in a manner that extends from the portion corresponding to the treading portion 302 of the wearer's foot 300 in the footbed portion 10A via the portion corresponding to the non-treading portion 303 to the portion corresponding to the heel portion 304 (i.e., from the rear end portion of the front foot portion R1 to the front end portion of the rear foot portion R3).

[0130] In addition, in the sandals 1A2 to 1A4 of the second to fourth variants, the buffer portion 13 included therein all satisfies the same conditions as the sandal 1A of the first embodiment (the basic structure of the three-dimensional network structure constituting the buffer portion 13 or the elastic modulus of the material constituting the buffer portion 13, the maximum outer dimension of each of the multiple columnar portions 6 in a cross-section perpendicular to the extension direction, the thickness of the buffer portion 13 in a direction perpendicular to the ground contact surface 12, etc.).

[0131] Therefore, in the case of the sandals 1A2 to 1A4 of the second to fourth variants, it is also possible to make sandals that can obtain the effects described in the first embodiment without bottoming out and can stably support the wearer's feet in a deformed state.

[0132] In addition, if Figures 15 to 17 As shown, in the sandals 1A2 to 1A4 of the second to fourth modified examples, the cushioning portion 13 is configured to be buried in the footbed portion 10A. Specifically, it is assumed that the entire footbed portion 10A is configured by a single structure 2 manufactured by a three-dimensional stacking molding method using a photoforming method, and the following situation is assumed, that is, the portion corresponding to the cushioning portion 13 is formed in a manner that satisfies the above conditions, and the portion other than the portion corresponding to the cushioning portion 13 is formed in a manner that does not satisfy the above conditions.

[0133] In this regard, instead of this configuration, the cushioning portion 13 may be composed of a single structure 2 made by a three-dimensional stacking method, and the cushioning portion 13 may be embedded in a member made of other materials (e.g., a general midsole member) to form the footbed portion 10A. In addition, the cushioning portion 13 does not necessarily need to be embedded in the footbed portion 10A, and may be configured such that its upper surface, lower surface, or peripheral surface is exposed from the footbed portion 10A.

[0134] <Fifth Modification>

[0135] Fig.18 1 is a schematic diagram for explaining the three-dimensional structure of the cushioning portion of the sandal of the fifth modified example. Fig.18 , a sandal 1A5 according to a fifth modified example of the first embodiment will be described.

[0136] When the sandal 1A5 according to the fifth modification is compared with the sandal 1A according to the first embodiment, the difference in configuration is only in that the cushioning portion 13 has a different three-dimensional structure.

[0137] Specifically, in the sandal 1A of the first embodiment, the three-dimensional network structure 3A constituting the cushioning portion 13 is formed by regularly and continuously arranging unit structures 4A called fluorite-type lattices, but in the sandal 1A5 of the fifth variation, as shown in FIG. Fig.18 As shown, the three-dimensional network structure 3B constituting the buffer portion 13 includes unit structures 4B in which a central support is added to a rectangular parallelepiped lattice and regularly and continuously arranged repeatedly.

[0138] In this case, the unit structure 4B including the three-dimensional lattice structure also has a three-dimensional shape in which a plurality of columnar portions 6 extending in a predetermined direction are connected to each other, and the unit space 5B occupied by the unit structure 4B also has a hexahedral shape.

[0139] In the case of the sandal 1A5 of the fifth variation, it is possible to make a sandal that can obtain the effects described in the first embodiment, does not touch the bottom and can stably support the wearer's foot in a deformed state.

[0140] <Implementation method 2>

[0141] Fig.19 2 is a perspective view of a shoe according to Embodiment 2. Fig.19 , the footwear 1B of this embodiment will be described.

[0142] like Fig.19 As shown, the footwear 1B includes a sole 30 and an upper 40. The sole 30 has a generally flat shape as a whole, and constitutes a footbed portion 10A that supports the wearer's foot. The upper 40 has a bag-like shape that covers the wearer's foot except the sole, thereby constituting a vamp portion 10B that covers the instep of the wearer's foot. The upper 40 is located above the sole 30.

[0143] The sole 30 includes a sole body 31 and an outer sole 32, and the outer sole 32 is fixed to the lower surface of the sole body 31 by, for example, bonding. The lower surface of the outer sole 32 constitutes a ground contact surface, and the sole body 31 is a portion that mainly supports the wearer's foot. The outer sole 32 is preferably excellent in wear resistance or grip, and may include, for example, a rubber member.

[0144] The upper 40 has a shoe opening 41 for inserting the wearer's foot at its upper portion, and a space for inserting the wearer's foot when wearing the shoe is formed inside. The lower surface of the upper 40 is fixed to the upper surface of the sole body 31 by, for example, bonding, and the inner bottom surface of the upper 40 constitutes a support surface for supporting the sole of the wearer's foot when wearing the shoe. As the upper 40, for example, woven fabric or knitted fabric, non-woven fabric, synthetic leather, resin, etc. are used. In particular, in shoes and boots that require air permeability or lightness, double raschel warp knitted fabrics knitted with polyester yarns are used.

[0145] In the shoe 1B of this embodiment, the sole body 31 is composed of a single member and includes a structure 2 produced by a three-dimensional lamination method using a photolithography method. More specifically, the sole body 31 includes: Figure 5 (A) shows a three-dimensional network structure 3A. As a result, the entire sole body 31 in the sole 30 as the footbed portion 10A functions as the cushioning portion 13. In addition, the material of the sole body 31 is not particularly limited, but can be the same material as the material of the sandal body 20 described in the first embodiment.

[0146] Here, the buffer portion 13 included in the footwear 1B of this embodiment satisfies the same conditions as those described in the first embodiment (i.e., the basic structure of the three-dimensional network structure constituting the buffer portion or the elastic modulus of the material constituting the buffer portion, the maximum outer dimensions of each of the multiple columnar portions in a cross-section perpendicular to the extension direction, the thickness of the buffer portion in a direction perpendicular to the ground contact surface, etc.).

[0147] Therefore, in the case of the footwear 1B of this embodiment, it is possible to obtain the effects described in the first embodiment, without bottoming out and stably supporting the wearer's foot in a deformed state.

[0148] <Implementation method 3>

[0149] Fig. 20 is a perspective view of a shoe according to Embodiment 3, Fig.21 It is along Fig. 20 The schematic cross-sectional view of the XXI-XXI line shown in FIG. Fig. 22 yes Fig. 20 The exploded view of the footwear shown in FIG. Figure 20 to Figure 22, the footwear 1C of this embodiment is described.

[0150] like Figure 20 to Figure 22 As shown, the shoe 1C is a sock-like shoe that covers substantially the entire foot of the wearer (ie, the part closer to the distal side than the ankle), and includes a shell 50 and an upper body 60. Both the shell 50 and the upper body 60 have a bag-like shape.

[0151] The housing 50 includes a sole 51 and an outer upper 52. The sole 51 has a substantially flat shape, and its lower surface 51b constitutes the ground contact surface 12. The outer upper 52 is erected from the periphery of the sole 51. An opening 53 is provided at the upper portion of the outer upper 52.

[0152] The upper body 60 includes a bottom 61 and an inner upper portion 62. The bottom 61 has a substantially flat shape, and its upper surface 61a constitutes a support surface 11 for supporting the sole of the wearer's foot when worn. The inner upper portion 62 is erected from the periphery of the bottom 61. A shoe opening 63 for inserting the wearer's foot is provided at the upper portion of the inner upper portion 62.

[0153] The bottom 61 of the upper body 60 is arranged on the sole 51 of the shell 50, and the inner upper part 62 is accommodated in the shell 50 in a manner overlapping with the outer upper part 52 of the shell 50. Thus, in the shoe boot 1C, the footbed part 10A supporting the foot of the wearer includes the sole 51 of the shell 50 and the bottom 61 of the upper body 60, and the vamp part 10B covering the instep of the wearer's foot includes a part of the outer upper part 52 of the shell 50 and a part of the inner upper part 62 of the upper body 60.

[0154] The upper body 60 is a part that contacts the foot of the wearer, and therefore preferably includes a member that can be flexibly deformed, for example, it may include a woven fabric or a knitted fabric, a nonwoven fabric, a synthetic leather, a resin, etc. In particular, as described later, if a woven fabric or a knitted fabric, a nonwoven fabric, etc. of a synthetic fiber having heat shrinkability is used, a shoe upper body that fits the foot of the wearer more closely can be made. In addition, as a synthetic fiber having heat shrinkability, for example, a synthetic fiber having polyester, polyurethane, etc. as a main component can be cited.

[0155] That is, when the upper body 60 includes a woven or knitted fabric, a non-woven fabric, or the like of a synthetic fiber having heat shrinkability, it is formed into a bag shape in advance and heat-treated with a last to be described later inserted therein, thereby causing heat shrinkage due to the heating, whereby the upper body 60 changes shape while being in close contact with the forming surface of the last and maintains its changed shape.

[0156] Therefore, if a shoe last corresponding to the shape of the wearer's foot is prepared and used to shape the upper body 60, the upper body 60 that fits the wearer's foot can be manufactured. Furthermore, if the shoe last is used and the upper body 60 is heated while being embedded in the shell 50, the upper body 60 also fits the shell 50, and the fit can be further improved.

[0157] In the shoe 1C of this embodiment, the shell 50 is composed of a single member and includes a structure 2 produced by a three-dimensional stacking method using a photolithography method. Here, the sole 51 in the shell 50 includes Figure 5 (A) shows a three-dimensional mesh structure 3A. As a result, the entire sole 51 of the footbed 10A functions as a cushioning portion 13. In addition, the material of the housing 50 is not particularly limited, but can be the same material as the material of the sandal body 20 described in the first embodiment.

[0158] Here, the buffer portion 13 included in the footwear 1C of this embodiment satisfies the same conditions as those described in the first embodiment (i.e., the basic structure of the three-dimensional network structure constituting the buffer portion or the elastic modulus of the material constituting the buffer portion, the maximum outer dimensions of each of the multiple columnar portions in a cross-section perpendicular to the extension direction, the thickness of the buffer portion in a direction perpendicular to the ground contact surface, etc.).

[0159] Therefore, in the case of the shoe 1C of this embodiment, it is also possible to make a shoe that can obtain the effect described in the first embodiment, does not touch the bottom and can stably support the wearer's foot in a deformed state.

[0160] <Implementation method 4>

[0161] Fig.23 4 is a perspective view of a shoe according to a fourth embodiment and an insole included in the shoe. Fig.23 , the footwear 1D of this embodiment is described.

[0162] like Fig.23 As shown, the shoe boot 1D includes a sole 70, an upper 40, and an insole 80. The sole 70 has a generally flat shape as a whole. The upper 40 has a bag-like shape that covers the wearer's foot except the sole, and is located above the sole 70. The insole 80 has a generally flat shape as a whole, and is included in the shoe boot 1D by being inserted into the upper 40.

[0163] The sole 70 includes a midsole 71 and an outer sole 72, and the outer sole 72 is fixed to the lower surface of the midsole 71 by, for example, bonding. The lower surface of the outer sole 72 constitutes a ground contact surface, and the midsole 71 is a portion that mainly supports the wearer's foot. The midsole 71 uses, for example, a resin foam material containing a resin material as a main component and a foaming agent or a cross-linking agent as a secondary component. The outer sole 72 is preferably excellent in wear resistance or grip, and may include, for example, a rubber member.

[0164] The upper 40 has a shoe opening 41 for inserting the wearer's foot at its upper portion, and a space for inserting the wearer's foot when wearing the shoe is formed inside. The lower surface of the upper 40 is fixed to the upper surface of the sole body 31 by, for example, bonding. As the upper 40, for example, woven fabric or knitted fabric, non-woven fabric, synthetic leather, resin, etc. are used. In particular, in shoes and boots that require air permeability or lightness, double raschel warp knitted fabrics knitted with polyester yarns are used.

[0165] The insole 80 is composed of a single member and includes a shape 2 produced by a three-dimensional lamination method of a photoforming method. The insole 80 has a two-layer structure including a base portion 81 and an upper portion 82, each of which is formed as a layer, and the upper portion 82 is located above the base portion 81. Thus, the upper surface 82a of the upper portion 82 constitutes a support surface 11 that supports the sole of the wearer's foot when worn.

[0166] The base layer 81 is a portion constituting the cushioning portion 13 as described later, and the upper layer 82 is a portion covering the base layer 81 in order to improve the touch of the foot. In addition, if a pad including, for example, woven fabric or non-woven fabric is provided on the insole 80 to further cover the upper layer 82, the wearer's foot can be more smoothly inserted into the inside of the shoe 1D when wearing it.

[0167] Here, the base portion 81 includes Figure 5 (A) shows a three-dimensional mesh structure 3A. Thus, the base layer 81 functions as the buffer portion 13 as described above. On the other hand, the upper layer 82 includes a sheet-like structure, and a plurality of holes penetrating along the thickness direction of the upper layer 82 are provided. From the perspective of achieving lightweight and improving the shaping accuracy of the insole, the plurality of holes are provided in the upper layer.

[0168] As described above, the insole 80 is included in the shoe 1D by being inserted into the upper 40, and more specifically, the insole 80 is disposed on the inner bottom surface of the upper 40. Thus, in the shoe 1D, the footbed portion 10A supporting the wearer's foot includes the sole 70 and the insole 80, and the vamp portion 10B covering the instep of the wearer's foot includes the upper 40.

[0169] In the shoe 1D of this embodiment, the insole 80 is composed of a single member and includes a structure 2 produced by a three-dimensional lamination method using a photolithography method. The base portion 81 of the insole 80 includes the following components: Figure 5 (A) shows a three-dimensional network structure 3A. As a result, the sole 70 as the footbed portion 10A and the base portion 81 in the insole 80 function as a buffer portion 13 as a whole. In addition, the material of the insole 80 is not particularly limited, but can be the same material as the material of the sandal body 20 described in the first embodiment.

[0170] Here, the buffer portion 13 included in the footwear 1D of this embodiment satisfies the same conditions as those described in the first embodiment (i.e., the basic structure of the three-dimensional network structure constituting the buffer portion or the elastic modulus of the material constituting the buffer portion, the maximum outer dimensions of each of the multiple columnar portions in a cross-section perpendicular to the extension direction, the thickness of the buffer portion in a direction perpendicular to the ground contact surface, etc.).

[0171] Therefore, in the case of the shoe 1D of this embodiment, it is also possible to make a shoe that can obtain the effects described in the first embodiment, does not touch the bottom and can stably support the wearer's foot in a deformed state.

[0172] <Summary of Disclosure Contents in Embodiments, etc.>

[0173] The characteristic points disclosed in the above-mentioned Embodiments 1 to 4 and their modifications are summarized as follows.

[0174] [Note 1]

[0175] A shoe includes a footbed portion that supports the sole of a wearer's foot and is provided with a ground contact surface, wherein:

[0176] The shoe bed portion includes a cushioning portion, the cushioning portion includes an elastic material having an elastic modulus of 0.1 MPa or more and 100 MPa or less and is composed of a single member,

[0177] The buffer portion includes a three-dimensional mesh structure formed by a plurality of columnar portions connected to each other as a unit structure, and the unit structure is repeatedly arranged in plurality.

[0178] Each of the plurality of columnar portions includes a columnar portion having a maximum outer dimension of 1.0 mm or more and 1.8 mm or less in a cross section perpendicular to the extending direction thereof,

[0179] The thickness of the buffer portion in a direction perpendicular to the ground contact surface is 25.0 mm or more.

[0180] [Note 2]

[0181] The shoe according to Supplementary Note 1, wherein a space factor of the buffer portion is greater than or equal to 10% and less than or equal to 45%.

[0182] [Note 3]

[0183] The shoe according to Supplementary Note 1 or 2, wherein, when a polyhedral space occupied by each of the unit structures is referred to as a unit space, a length of one side of the unit space is greater than or equal to 3.0 mm and less than or equal to 20.0 mm.

[0184] [Note 4]

[0185] The shoe according to any one of Supplementary Notes 1 to 3, wherein each of the plurality of columnar portions extends non-parallel to a direction orthogonal to the ground contact surface.

[0186] [Note 5]

[0187] The shoe according to any one of Notes 1 to 4, wherein the footbed portion comprises: a forefoot portion supporting the toe portion and the stepping portion of the wearer's foot; a midfoot portion supporting the non-stepping portion of the wearer's foot; and a rearfoot portion supporting the heel portion of the wearer's foot,

[0188] The buffer portion is located at least at the rear foot portion.

[0189] [Note 6]

[0190] The shoe according to Supplementary Note 5, wherein the cushioning portion is located in the forefoot portion in addition to the rearfoot portion.

[0191] [Note 7]

[0192] The shoe according to Supplementary Note 6, wherein the cushioning portion is arranged across the forefoot portion, the midfoot portion, and the rearfoot portion.

[0193] [Note 8]

[0194] The shoe according to Supplementary Note 6 or 7, wherein the maximum outer dimension of the columnar portion located in a portion included in the rear foot portion is larger than the maximum outer dimension of the columnar portion located in a portion of the cushioning portion adjacent to the portion.

[0195] [Note 9]

[0196] A shoe according to any one of Notes 6 to 8, wherein the maximum outer dimension of the columnar portion of the buffer portion located at a portion of the sole supporting the wearer corresponding to the MP joint is larger than the maximum outer dimension of the columnar portion of the buffer portion located adjacent to the portion.

[0197] [Note 10]

[0198] The shoe according to any one of Supplementary Notes 1 to 9, wherein the cushioning portion includes a single structure produced by a three-dimensional lamination method using a photolithography method.

[0199] [Note 11]

[0200] The shoe according to any one of Notes 1 to 10, wherein the shoe is a sandal,

[0201] The buffer portion is arranged on the sole of the sandal.

[0202] [Note 12]

[0203] The shoe according to any one of Notes 1 to 10, wherein the shoe is a boot,

[0204] The buffer portion is disposed on the sole of the shoe.

[0205] [Note 13]

[0206] The shoe according to any one of Notes 1 to 10, wherein the footbed portion includes a sole and an insole located above the sole,

[0207] The buffer portion is disposed on the insole.

[0208] <Other methods, etc.>

[0209] In the embodiments and their variations, the case where the three-dimensional network structure constituting the buffer portion is composed of a structure in which a plurality of unit structures of a single type are repeatedly arranged is illustrated and described, but it can also be composed of a structure containing different types of unit structures. For example, it can also be set that a part of the buffer portion is composed of the fluorite-type lattice, and the other part of the buffer portion is composed of a central support added to the rectangular lattice. In this way, in the case where the three-dimensional network structure is composed of a structure containing different types of unit structures, it is preferable to continuously change its shape so that the shape transfer along their arrangement direction is carried out smoothly.

[0210] In addition, in the above-mentioned embodiments and their variations, the case where the cushioning portion provided in the shoe bed portion is manufactured by the three-dimensional stacking molding method using photomolding is exemplified and described, but it can of course also be manufactured by other types of three-dimensional stacking molding methods, and can also be manufactured by other methods other than the three-dimensional stacking molding method represented by injection molding.

[0211] Furthermore, in the above-described embodiment and its modified examples, the case where the present invention is applied to sandals, shoes, and articles equipped with insoles thereon is exemplified and described, but the present invention can of course also be applied to other types of shoes.

[0212] Furthermore, the characteristic structures disclosed in the above-described embodiments and their modifications can be combined with each other within a scope not departing from the gist of the present invention.

[0213] Thus, the embodiments and modifications disclosed this time are illustrative in all aspects and are not restrictive. The technical scope of the present invention is defined by the claims, and includes all modifications within the meaning and scope equivalent to the claims.

[0214] Explanation of symbols

[0215] 1A, 1A1~1A5: Sandals

[0216] 1B~1D: Shoes and boots

[0217] 2: Creations

[0218] 2': Support Department

[0219] 3A, 3A', 3B: Three-dimensional network structure

[0220] 4A, 4A', 4B: Unit structure

[0221] 5A, 5A', 5B: Unit space

[0222] 6: Columnar part

[0223] 10A: Footbed

[0224] 10B: Upper part

[0225] 11: Support surface

[0226] 12: Ground plane

[0227] 13: Buffer

[0228] 20: Sandal body

[0229] 21: bottom of the shoe

[0230] 21a: Upper surface

[0231] 21b: Lower surface

[0232] 22: Shoelaces

[0233] 23: Shoe opening

[0234] 24: Front opening

[0235] 30: Sole

[0236] 31: Sole body

[0237] 32: Outsole

[0238] 40: Upper

[0239] 41: Shoe opening

[0240] 50: Shell

[0241] 51: bottom of the shoe

[0242] 51b: Lower surface

[0243] 52: Outer upper part

[0244] 53: Opening

[0245] 60: Upper body

[0246] 61: Bottom

[0247] 61a: Upper surface

[0248] 62: Inside upper

[0249] 63: Shoe opening

[0250] 70: Sole

[0251] 71: Midsole

[0252] 72: Outsole

[0253] 80: Insole

[0254] 81: Grassroots Department

[0255] 82: Upper part

[0256] 82a: Upper surface

[0257] 100: Three-dimensional stacking device

[0258] 101: Storage Tank

[0259] 102: Platform

[0260] 103: Lifting mechanism

[0261] 200: Liquid resin

[0262] 300: Feet

[0263] 301: Toes

[0264] 302: Trampling Department

[0265] 303: Non-trampling department

[0266] 304: Heel

[0267] R1: Forefoot

[0268] R2: Midfoot

[0269] R3: Back foot.

Claims

1. A shoe comprising a footbed portion that supports the sole of a wearer's foot and is provided with a ground contact surface, wherein: The shoe bed portion includes a cushioning portion, the cushioning portion includes an elastic material having an elastic modulus of 0.1 MPa or more and 100 MPa or less and is composed of a single member, The buffer portion includes a three-dimensional mesh structure formed by a plurality of columnar portions connected to each other as a unit structure, and the unit structure is repeatedly arranged in plurality. Each of the plurality of columnar portions includes a columnar portion having a maximum outer dimension of 1.0 mm or more and 1.8 mm or less in a cross section perpendicular to the extending direction thereof, The thickness of the buffer portion in a direction perpendicular to the ground contact surface is 25.0 mm or more.

2. The shoe according to claim 1, wherein: The space factor of the buffer portion is greater than or equal to 10% and less than or equal to 45%.

3. The shoe according to claim 1, wherein: When a polyhedral space occupied by each of the unit structures is referred to as a unit space, the length of one side of the unit space is greater than or equal to 3.0 mm and less than or equal to 20.0 mm.

4. The shoe according to claim 1, wherein: Each of the plurality of columnar portions extends non-parallel to a direction orthogonal to the ground plane.

5. The shoe according to claim 1, wherein: The shoe bed portion includes: a forefoot portion supporting the toe portion and the treading portion of the wearer's foot; a midfoot portion supporting the non-treading portion of the wearer's foot; and a rearfoot portion supporting the heel portion of the wearer's foot. The buffer portion is located at least at the rear foot portion.

6. The shoe according to claim 5, wherein: The cushioning portion is located at the front foot portion in addition to being located at the rear foot portion.

7. The shoe according to claim 6, wherein: The buffer portion is arranged across the front foot portion, the mid foot portion, and the rear foot portion.

8. The shoe according to claim 6, wherein: The maximum outer dimension of the columnar portion located in a portion included in the rear leg portion is larger than the maximum outer dimension of the columnar portion located in a portion of the cushioning portion adjacent to the portion.

9. The shoe according to claim 6, wherein: The maximum outer dimension of the columnar portion of the cushioning portion located at a portion supporting the sole of the wearer corresponding to the metatarsophalangeal joint is larger than the maximum outer dimension of the columnar portion of the cushioning portion located adjacent to the portion.

10. The shoe according to claim 1, wherein: The buffer portion includes a single structure produced by a three-dimensional lamination method using a photolithography method.

11. The shoe according to any one of claims 1 to 10, wherein: The shoes are sandals, The buffer portion is arranged on the sole of the sandal.

12. The shoe according to any one of claims 1 to 10, wherein: The shoes are footwear, The buffer portion is disposed on the sole of the shoe.

13. The shoe according to any one of claims 1 to 10, wherein: The footbed portion includes a sole and an insole located above the sole. The buffer portion is disposed on the insole.

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