Sole and shoe

Abstract

A sole includes a main body, a first elastic unit and a first optical unit. The main body has flexibility. The first elastic unit is embedded in the main body, wherein the first elastic unit includes a first bladder defining a first accommodation space and a first fluid disposed in the first accommodation space. At least a portion of the first bladder is light-energy transmissible. The first optical unit is disposed corresponding to the first elastic unit, wherein at least a portion of the first optical unit is configured to transmit energy of light to the first fluid through the first bladder.

Description

[Technical Field]

[0001] The present invention relates to a sole and a shoe, and more particularly to an adjustable elastic sole and a shoe. [Previous Technology]

[0002] Shoes conventionally comprise an upper and a sole. The upper can be formed of any suitable material to accommodate, secure, or cover the foot over the sole. The upper can be fitted with straps, laces, or other fasteners to adjust the fit around the user's foot. The portion of the upper closest to the sole connects to the sole. The sole provides support and cushioning to reduce the burden on the user's lower limbs and mitigate the impact of footsteps. However, the elasticity provided by conventional soles cannot be adaptively adjusted, thus failing to provide the necessary elasticity for different usage needs. [Summary of the Invention]

[0003] One object of the present invention is to provide a shoe sole and a shoe to solve the above-mentioned problems.

[0004] According to one embodiment of the present invention, a shoe sole is provided, comprising a body, a first elastic unit, and a first optical unit. The body is flexible. The first elastic unit is embedded in the body, wherein the first elastic unit includes a first capsule defining a first receiving space and a first fluid disposed in the first receiving space, at least a portion of the first capsule having light energy transmission capability. The first optical unit is disposed corresponding to the first elastic unit, wherein at least a portion of the first optical unit is used to transmit the energy of a light source through the first capsule to the first fluid.

[0005] According to another embodiment of the present invention, a shoe is provided, comprising the above-described sole.

[0006] Compared with the prior art, the present invention uses a first optical unit corresponding to a first elastic unit. The first optical unit can transmit the energy of light through the first capsule to the first fluid, thereby changing the temperature and volume of the first fluid, and thus changing the pressure inside the first capsule. This allows the elasticity provided by the first elastic unit to be adjusted, which is beneficial for the sole to provide different elasticity according to different usage needs. [Simplified Explanation of the Diagram]

[0072] Figure 1 is a top view of a shoe sole according to an embodiment of the present invention.

[0073] Figure 2 is a side view of the sole of the shoe in Figure 1.

[0074] Figure 3 is a cross-sectional view of the sole along section line A-A' in Figure 1.

[0075] Figure 4 is a partial sectional view of the sole along section line B-B' in Figure 1.

[0076] Figure 5 is another partial sectional view of the sole along section line B-B' in Figure 1.

[0077] Figure 6 is a partial cross-sectional view of the sole of a shoe before and after being compressed, according to another embodiment of the present invention.

[0078] Figure 7 is a partial cross-sectional view of the sole of a shoe before and after being compressed, according to another embodiment of the present invention.

[0079] Figure 8 is a partial cross-sectional schematic diagram of the sole of a shoe according to another embodiment of the present invention.

[0080] Figure 9 is a partial cross-sectional schematic diagram of a shoe sole according to another embodiment of the present invention.

[0081] Figure 10 is a partial cross-sectional schematic diagram of the sole of a shoe according to another embodiment of the present invention.

[0082] Figure 11 is a partial cross-sectional schematic diagram of the sole of a shoe according to another embodiment of the present invention.

[0083] Figure 12 is a top view of a shoe sole according to another embodiment of the present invention.

[0084] Figure 13 is a top view of a shoe sole according to another embodiment of the present invention.

[0085] Figure 14 is a side view of the sole of the shoe in Figure 13.

[0086] Figure 15 is a side view of a shoe according to another embodiment of the present invention.

Implementation Method

[0007] To enable those skilled in the art to further understand the present invention, preferred embodiments of the present invention are listed below, and the composition and desired effects of the present invention are described in detail with reference to the accompanying drawings. It should be noted that the drawings are simplified schematic diagrams; therefore, only the components and combinations related to the present invention are shown to provide a clearer description of the basic structure or implementation method of the present invention, while the actual components and layout may be more complex. Furthermore, for ease of explanation, the components or assemblies shown in the various drawings of the present invention are not drawn to scale according to the actual quantity, shape, and size; their detailed scale can be adjusted according to design requirements.

[0008] The directional terms mentioned in the following embodiments, such as up, down, left, right, front, or back, are only for reference to the accompanying drawings. Therefore, the directional terms used are for illustrative purposes and not for limiting the present invention.

[0009] It should be understood that although the terms first, second, third... can be used to describe multiple components, the components are not limited to these terms. These terms are only used to distinguish a single component from other components. Such terms in the claims may not be the same as those in the specification, but may be replaced by first, second, third... in accordance with the order in which the elements are declared in the claims.

[0010] The descriptions in this invention such as "one component is disposed on another component" and "one component is connected to another component" may refer to "the component is in direct contact with the other component" or "there are other components between the component and the other component", so that the component and the other component are not in direct contact.

[0011] <Shoe Sole>

[0012] Please refer to Figures 1, 2, 3, and 4. Figure 1 is a top view of the sole 10A according to an embodiment of the present invention, and Figure 2 is a side view of the sole 10A in Figure 1. Figure 3 is a cross-sectional view of the sole 10A in Figure 1 along section line A-A'. Figure 4 is a partial cross-sectional view of the sole 10A in Figure 1 along section line B-B'. For simplicity, the flange portion FP of the sole 10A is omitted in Figure 1 compared to Figure 3. The sole 10A includes a body 100A, an elastic unit 200A, and an optical unit 300A. The body 100A is flexible. An elastic unit 200A is embedded in the body 100A. The elastic unit 200A includes a capsule 210A and a fluid 214A. The capsule 210A defines a receiving space 212A, and the fluid 214A is disposed in the receiving space 212A. At least a portion of the capsule 210A is light-energy transmissible. An optical unit 300A is disposed corresponding to the elastic unit 200A, wherein at least a portion of the optical unit 300A is used to transmit the energy of light L through the capsule 210A to the fluid 214A. Thereby, the fluid 214A, affected by the energy of light L, will change in temperature and volume, thereby altering the pressure inside the capsule 210A. This allows adjustment of the elasticity provided by the elastic unit 200A, enabling the sole 10A to provide different elasticities to meet different usage requirements.

[0013] The aforementioned "at least a portion of the capsule 210A has light energy transmission capability" can refer to the ability of at least a portion of the capsule 210A to transmit the energy of light ray L. For example, when at least a portion of the capsule 210A is translucent, light ray L can penetrate the capsule 210A and enter the accommodating space 212A to transfer its energy to the fluid 214A. Alternatively, when at least a portion of the capsule 210A is not translucent, after light ray L irradiates the capsule 210A, the capsule 210A absorbs the energy of light ray L and then transfers the energy of light ray L to the fluid 214A (e.g., through conduction, radiation, etc.). In some embodiments, light ray L can simultaneously transfer its energy to the fluid 214A by penetrating the capsule 210A and irradiating the capsule 210A. In other words, light ray L can directly transfer its energy to the fluid 214A by penetrating the capsule 210A and / or indirectly transfer its energy to the fluid 214A by irradiating the capsule 210A. The following embodiments are illustrated by taking the at least partial translucency of the capsule 210A as an example, but the present invention is not limited thereto.

[0014] The aforementioned "at least part of the optical unit 300A is used to transfer the energy of light L through the capsule 210A to the fluid 214A" may refer to at least part of the optical unit 300A being transparent and having the ability to control light L (e.g., to change the direction of light L), so that light L can pass through at least part of the optical unit 300A and be focused into the accommodating space 212A of the capsule 210A or the capsule 210A itself, thereby allowing the energy of light L to be transferred to the fluid 214A through the capsule 210A.

[0015] For example, the optical unit 300A includes an optical element that can change the direction of the light ray L, such as an optical element that can provide a focusing effect. In this embodiment, at least a portion of the optical unit 300A is provided with a lens 310A, and the lens 310A is used to allow the light ray L to pass through and be focused on the receiving space 212A. However, the present invention is not limited thereto. In other embodiments, the optical unit 300A may include micro-optical devices, such as a folding optical lens group or a multi-path optical lens group. That is, the optical unit 300A can focus the light ray L onto the receiving space 212A by refraction, reflection or a combination thereof.

[0016] In detail, the sole 10A can be applied to different types of shoes. For example, the sole 10A can be used as the sole of athletic shoes, leather shoes, hiking boots, boots, sandals, slippers, etc., but is not limited to these. The sole 10A can be used as the midsole and / or outsole of a shoe, depending on factors such as the type of shoe to which the sole 10A is applied or the position of the sole 10A in the shoe.

[0017] The aforementioned "light L" may refer to light from the "external" side of the shoe, that is, light that is not emitted by a light source of the shoe components. For example, light L may be ambient light, such as natural light (such as sunlight), or artificial light, such as light emitted by lamps, flashlights, or other devices.

[0018] The aforementioned "body 100A is flexible" can refer to body 100A having toughness, that is, body 100A is flexible yet strong. The material of body 100A can be thermoplastic resin, thermosetting resin, or a combination thereof. For example, the material of body 100A can include ethylene vinyl acetate (EVA), polyurethane (PU) foam, thermoplastic polyurethane (TPU), thermoplastic elastomer (TPE), thermoplastic rubber (TPR), rubber, or a combination thereof, but is not limited to these. Furthermore, body 100A can be a single-layer structure or a multi-layer structure. When body 100A is a multi-layer structure, each layer can be made of different materials to provide different functions.

[0019] In this embodiment, the body 100A is illustrated as a double-layer structure, comprising a first layer 110A and optionally a second layer 120A. The first layer 110A is mainly used to provide shock absorption, cushioning, and resilience, thereby effectively absorbing the force of ground feedback during walking or running, reducing the impact force on the foot, and providing support by moderately bearing the user's weight. The first layer 110A can be used as the midsole of a shoe, and the material of the first layer 110A can be, for example, EVA, PU, ​​TPU, TPE, TPR, or a combination thereof. The second layer 120A is mainly used to provide relatively high hardness, wear resistance, and slip resistance to protect the user's feet from injury by hard or sharp objects on the ground, resist rough surfaces, and prevent the user from slipping in smooth or wet places. The second layer 120A can be used as the outsole of a shoe, and the material of the second layer 120A can be, for example, rubber, TPR, or a combination thereof. However, the present invention is not limited thereto. For example, the body 100A may only include the first layer 110A, or may include other layers as needed. In some embodiments, the body 100A may further include an inner bottom layer (not shown) disposed on the side of the first layer 110A away from the second layer 120A. The inner bottom layer may be used to provide excellent tactile feel and / or skin-friendliness. The material of the inner bottom layer may be, for example, but not limited to, woven fabric, knitted fabric, non-woven fabric, fiber cloth, or silicone pad.

[0020] The body 100A may optionally include a flange portion FP formed on the periphery of the body 100A. The flange portion FP may extend upward from the periphery of the body 100A, and the flange portion FP may be integrally formed on the periphery of the body 100A. When the sole 10A is applied to closed shoes, the flange portion FP may, for example, serve as the part where the sole 10A joins with the upper. When the sole 10A is applied to non-closed shoes such as slippers and sandals, the flange portion FP may, for example, provide a foot restraint function.

[0021] The body 100A may include surfaces 101, 102, and 103 and a chamber 130A. Surface 102 is opposite to surface 101, surface 103 is connected between surface 101 and surface 102, and chamber 130A is formed in the body 100A. Chamber 130A includes an opening 132A formed on surface 101, and elastic unit 200A is embedded in chamber 130A corresponding to opening 132A. Chamber 130A may further include an opening 134A formed on surface 103, and optical unit 300A is disposed in chamber 130A corresponding to opening 134A. Here, surfaces 101, 102, and 103 are the upper surface, lower surface, and side surface of sole 10A, respectively. When sole 10A is applied to a shoe and worn by a user, surface 101 is closer to the user's foot than surface 102.

[0022] In this embodiment, the elastic unit 200A may further include capsules 210B and 210C. Capsules 210A, 210B, and 210C are sequentially arranged from the heel towards the toe. Capsule 210B defines a receiving space 212B, in which fluid 214B is disposed. At least a portion of capsule 210B has light-transmitting properties; for example, at least a portion of capsule 210B is translucent. Capsule 210C defines a receiving space 212C, in which fluid 214C is disposed. At least a portion of capsule 210C has light-transmitting properties; for example, at least a portion of capsule 210C is translucent.

[0023] The optical unit 300A may further include lenses 310B and 310C. Lenses 310A, 310B, and 310C are arranged sequentially from the heel to the toe, and the three lenses 310A, 310B, and 310C of the optical unit 300A correspond to the three capsules 210A, 210B, and 210C of the elastic unit 200A, respectively. Lens 310A corresponds to capsule 210A and is used to focus light L into the receiving space 212A of capsule 210A; lens 310B corresponds to capsule 210B and is used to focus light L into the receiving space 212B of capsule 210B; and lens 310C corresponds to capsule 210C and is used to focus light L into the receiving space 212C of capsule 210C. However, the present invention is not limited thereto, and the number of capsules in the elastic unit 200A and the number of lenses in the optical unit 300A can be adjusted according to actual needs.

[0024] For example, the elastic unit 200A may contain only one capsule, or the elastic unit 200A may contain two or more capsules. Furthermore, the number of lenses in the optical unit 300A may be the same as or different from the number of capsules in the elastic unit 200A. As shown in this embodiment, the number of lenses in the optical unit 300A is the same as the number of capsules in the elastic unit 200A, and the lenses and capsules may have a one-to-one correspondence. In some embodiments, the number of lenses in the optical unit 300A is different from the number of capsules in the elastic unit 200A, and the lenses and capsules may have a one-to-many or many-to-one correspondence. For example, the optical unit 300A may contain only one elongated lens, and the elastic unit 200A may contain a plurality of capsules. As long as the span of the lens can cover the plurality of capsules at once, the elongated lens can focus light into the accommodating space of the plurality of capsules. For example, the optical unit 300A may include a plurality of lenses, and the elastic unit 200A may include only a single elongated capsule. As long as the plurality of lenses are located within the span of the capsule, the plurality of lenses can focus light into the accommodating space of the single capsule.

[0025] As shown in Figures 1, 3, and 4, the capsules 210A, 210B, and 210C are configured as cylindrical, but are not limited thereto. For example, the capsules 210A, 210B, and 210C may be configured as rectangular prisms, polygonal prisms, cones, pyramids, or approximately spherical shapes. In Figure 4, the capsules 210A, 210B, and 210C have diameters D11, D12, and D13, respectively, and the diameters D11, D12, and D13 are equal. The capsules 210A, 210B, and 210C have heights H11, H12, and H13, respectively, where height H12 is greater than height H11, and height H11 is greater than height H13. In other words, the capsules 210A, 210B, and 210C have the same diameter but different heights. However, the present invention is not limited thereto. In other embodiments, the shape, lateral dimensions (e.g., diameter, width), and vertical dimensions (e.g., height) of the capsules 210A, 210B, and 210C can be individually adjusted according to actual needs. When the elastic unit 200A includes a plurality of capsules, the shape and size of the plurality of capsules may be the same or different.

[0026] Fluids 214A, 214B, and 214C may be gases, such as air, oxygen, carbon dioxide, nitrogen, other inert gases, or combinations thereof, but are not limited thereto. In some embodiments, fluids 214A, 214B, and 214C may be liquids, such as a mixture of glycerol. Fluids 214A, 214B, and 214C may be the same or different. In other words, when the elastic unit 200A comprises a plurality of capsules, the fluids in the plurality of capsules may be the same or different.

[0027] Lenses 310A, 310B, and 310C can be lenses that provide a light-gathering effect, such as convex lenses or Fresnel lenses, each independently. Here, lenses 310A, 310B, and 310C are all Fresnel lenses, but are not limited thereto. In other embodiments, lenses 310A, 310B, and 310C can all be convex lenses, or at least one of lenses 310A, 310B, and 310C can be a Fresnel lens and the rest can be convex lenses. In other words, when the optical unit 300A includes a plurality of lenses, the types of the plurality of lenses can be the same or different, and the refractive power / focal length of the plurality of lenses can be the same or different.

[0028] As can be seen from the above, the present invention can adjust the elasticity provided by each bladder by adjusting factors such as the shape, size, fluid type, lens type, and diopter / focal length of the bladder. When there are multiple bladders, the present invention can further adjust the shape, size, fluid type, lens type, diopter / focal length, and other factors of the bladder according to the position of the bladder to provide different elasticity to different parts of the sole, so as to meet the requirements of different types of shoes. For example, the elasticity configuration required for the soles of hiking boots, basketball shoes, and running shoes may be different.

[0029] Referring again to Figures 1 and 3, the sole 10A may further include another elastic unit 200B embedded in the body 100A, and another optical unit 300B corresponding to the elastic unit 200B. The elastic unit 200B includes a capsule 210A and a fluid 214A. The capsule 210A defines a receiving space 212A, and the fluid 214A is disposed in the receiving space 212A. At least a portion of the capsule 210A is light-transmitting. At least a portion of the optical unit 300B is light-transmitting and is used to focus light L into the receiving space 212A.

[0030] In this embodiment, the elastic unit 200B has the same structure as the elastic unit 200A, and the optical unit 300B has the same structure as the optical unit 300A. Other details regarding the elastic unit 200B and the optical unit 300B can be found in the relevant descriptions of the elastic unit 200A and the optical unit 300A, and will not be repeated here. In other embodiments, the structure of the elastic unit 200B may differ from that of the elastic unit 200A, and the structure of the optical unit 300B may differ from that of the optical unit 300A. Therefore, the elastic units 200A and 200B can independently provide the required adjustment force according to different application needs.

[0031] The body 100A may further include another chamber 130B formed therein. The chamber 130B may include an opening 132B formed on surface 101 and an opening 134B formed on surface 103. The openings 134B and 134A are disposed opposite to each other, and the optical unit 300B is disposed in the chamber 130B corresponding to the opening 134B. Here, both openings 134A and 134B are disposed on surface 103, and the openings 134A and 134B are located on opposite sides of the body 100A, for example, the left and right sides of the body 100A in Figure 3. The structure of the chamber 130B is the same as that of the chamber 130A, but is not limited thereto. In other embodiments, when the structures of the elastic unit 200B and the elastic unit 200A are different, or the structures of the optical unit 300B and the optical unit 300A are different, the structure (e.g., shape and size) of the chamber 130B may be changed accordingly.

[0032] As shown in Figure 4, the elastic unit 200A can be formed by flexible sheet FS1 and flexible sheet FS2. Flexible sheet FS1 includes a peripheral portion PP1 and a recess CP1. The peripheral portion PP1 is fixed to the surface 101. The recess CP1 is recessed from the peripheral portion PP1 toward the surface 102 and is located in the chamber 130A, defining a cavity (not otherwise labeled). Flexible sheet FS2 closes the cavity defined by the recess CP1 to form an accommodating space 212A. In other words, the capsule 210A is formed by connecting flexible sheet FS1 and flexible sheet FS2. Since the elastic unit 200A further includes bladders 210B and 210C, the flexible sheet FS1 may further include recesses CP2 and CP3. Recesses CP2 and CP3 are recessed from the peripheral portion PP1 toward the surface 102 and are located in the chamber 130A, respectively defining two cavities (not otherwise labeled). The flexible sheet FS2 closes the cavities defined by recesses CP2 and CP3, forming accommodating spaces 212B and 212C respectively. In other words, bladders 210B and 210C are also formed by connecting the flexible sheets FS1 and FS2. From the above, it can be seen that the number of recesses in the flexible sheet FS1 in this embodiment is the same as the number of bladders in the elastic unit 200A.

[0033] Referring simultaneously to Figures 1, 3, and 4, the body 100A may optionally have two fitting portions EP, corresponding to the elastic units 200A and 200B respectively. Here, the fitting portion EP is a stepped shallow groove formed by the downward indentation of the surface 101, surrounding the openings 132A and 132B respectively, for accommodating the peripheral portions of the elastic units 200A and 200B (the portion formed by connecting the peripheral portion PP1 of the flexible sheet FS1 in the elastic units 200A and 200B with the flexible sheet FS2). In this way, the top surfaces (not otherwise labeled) of the elastic units 200A and 200B can be flush with the portion of the surface 101 other than the fitting portion EP, forming a flat surface. However, it is not limited to this. In other embodiments, the body 100A may not have formed the fitting portion EP. In this case, the aforementioned peripheral portion PP1 can be directly fixed to the surface 101, forming an uneven surface.

[0034] In this embodiment, the peripheral portion PP1 of the elastic units 200A and 200B is fixed to the fitting portion EP. That is, the body 100A carries the elastic units 200A and 200B through the fitting portion EP, so that when the body 100A is not under pressure, the bottom of the bladders 210A, 210B and 210C will not contact the bottom of the chambers 130A and 130B, thus forming a suspended structure. Similarly, in other embodiments where the body 100A does not form a fitting portion EP, the peripheral portion PP1 of the elastic units 200A and 200B can be directly fixed to the surface 101. That is, the body 100A carries the elastic units 200A and 200B through the surface 101. Similarly, when the body 100A is not under pressure, the bottom of the bladders 210A, 210B and 210C will not contact the bottom of the chambers 130A and 130B, thus forming a suspended structure.

[0035] In this embodiment, the materials of the capsules 210A, 210B, and 210C can be thermoplastic resin, that is, the materials of the flexible sheets FS1 and FS2 can be thermoplastic resin, such as, but not limited to, thermoplastic polyurethane. The materials of the optical units 300A and 300B can be thermoplastic resin, such as, but not limited to, thermoplastic polyurethane. In addition, the optical units 300A and 300B can be manufactured by extrusion molding or injection molding, so the optical units 300A and 300B can be integrally molded components.

[0036] Please refer to Figures 4 and 5 simultaneously. Figure 5 is another partial sectional view of the sole 10A along section line B-B' in Figure 1. Figure 4 shows the sole 10A in an uncompressed state, while Figure 5 shows the sole 10A under pressure. For example, when a user wears a shoe with a sole 10A, the user's weight provides a downward force F to the sole 10A, causing deformation of the body 100A, such as downward compression. In Figure 4, the chamber 130A has a bottom surface 136A, and the chamber 130A has a bottom end (unlabeled) away from the surface 101. Here, the bottom end of the chamber 130A is the bottom surface 136A. In the elastic unit 200A, the capsules 210A, 210B and 210C have spacings SD11, SD12 and SD13 between themselves and the bottom end, respectively. The spacings SD11, SD12 and SD13 are different, with spacing SD12 being smaller than spacing SD11 and spacing SD11 being smaller than spacing SD13.

[0037] As shown in Figure 5, when the surface 101 is compressed, the elastic unit 200A has gaps SD21, SD22, and SD23 between its bladders 210A, 210B, and 210C and its bottom end, respectively. At this time, gap SD21 is smaller than gap SD11, gap SD22 is smaller than gap SD12, and gap SD23 is smaller than gap SD13. In other words, in this embodiment, when the surface 101 is not compressed, the gaps between the elastic unit 200A's bladders 210A, 210B, and 210C and its bottom end are different. However, when the surface 101 is compressed, the gaps between the elastic unit 200A's bladders 210A, 210B, and 210C and its bottom end all become smaller.

[0038] It is worth mentioning that, due to the different initial spacings SD11, SD12, and SD13, when the surface 101 is compressed as a whole, causing the elastic unit 200A to also be compressed, the order in which the bladders 210A, 210B, and 210C touch the bottom is different. As shown in Figure 5, bladder 210B will touch the bottom first. At this time, the spacing SD22 is zero, and the bottom can provide the first stage of support for the user's foot through bladder 210B. As the downward force F continues to increase, bladder 210A will then touch the bottom, and the bottom can provide the second stage of support for the user's foot through bladders 210B and 210A. As the downward force F continues to increase, bladder 210C will then touch the bottom, and the bottom can provide the third stage of support for the user's foot through bladders 210B, 210A, and 210C. Therefore, by having different initial spacings SD11, SD12, and SD13, the sole 10A can provide multi-stage support for the user's foot, meaning the sole 10A can provide a variety of cushioning strokes. Furthermore, in other embodiments, by appropriately adjusting the spacing between the plurality of bladders and the bottom of the chamber, the sole 10A can also provide progressively enhanced elasticity.

[0039] On the other hand, when the user needs the sole 10A to provide more support, the optical unit 300A can be exposed to a light source. For example, the optical unit 300A can be illuminated with a light, causing the fluids 214A, 214B, and 214C inside the bladders 210A, 210B, and 210C to expand in volume, thereby increasing the pressure inside the bladders 210A, 210B, and 210C and providing greater elasticity.

[0040] In this embodiment, since the elastic unit 200B and the elastic unit 200A have the same structure, and the chamber 130B and the chamber 130A have the same structure, when the sole 10A is not compressed, the relationship between each bladder 210A, 210B and 210C in the elastic unit 200B and the bottom end of the chamber 130B can be the same as in Figure 4. When the sole 10A is compressed, the relationship between each bladder 210A, 210B and 210C in the elastic unit 200B and the bottom end of the chamber 130B can be the same as in Figure 5. Therefore, the descriptions in Figures 4 and 5 also apply to the elastic unit 200B, and will not be repeated here.

[0041] As can be seen from the above, the embodiments in Figures 1 to 5 utilize the different heights of the bladders 210A, 210B, and 210C, while the bottom of the chamber 130A is flat and uniform (without height difference), resulting in different distances between the bladders 210A, 210B, and 210C and the bottom of the chamber 130A, thus providing multi-segment support. In practical applications, depending on the purpose and intended use of the sole 10A (e.g., for sports footwear), the heights of the bladders 210A, 210B, and 210C can be appropriately adjusted to change the order in which the bladders 210A, 210B, and 210C contact the bottom, thereby producing different cushioning effects.

[0042] Please refer to Figure 6, which is a partial cross-sectional view of the sole 10B before and after compression according to another embodiment of the present invention. The viewing angle is the same as that in Figure 4. The main difference between the sole 10B in Figure 6 and the sole 10A in Figure 4 is that the body 100B may further include cushioning blocks 140A, 140B, and 140C protruding from the bottom surface 136A of the self-contained chamber 130A toward the surface 101. The cushioning blocks 140A, 140B, and 140C correspond to the bladders 210A, 210B, and 210C, respectively. Here, the cushioning blocks 140A, 140B, and 140C are integrally formed on the first layer 110B of the body 100B.

[0043] As shown in part (A) of Figure 6, when surface 101 is not under pressure, the capsules 210A, 210B, and 210C have heights H11, H12, and H13, respectively, with height H12 greater than height H11 and height H11 greater than height H13. The buffer blocks 140A, 140B, and 140C have heights H21, H22, and H23, respectively, with height H23 greater than height H21 and height H21 greater than height H22. There is a distance SD31 between capsule 210A and buffer block 140A, a distance SD32 between capsule 210B and buffer block 140B, and a distance SD33 between capsule 210C and buffer block 140C. Distances SD31, SD32, and SD33 are equal.

[0044] As shown in part (B) of Figure 6, when surface 101 is compressed, there is a distance SD41 between the capsule 210A and the buffer block 140A, a distance SD42 between the capsule 210B and the buffer block 140B, and a distance SD43 between the capsule 210C and the buffer block 140C. Distance SD41 is smaller than distance SD31, distance SD42 is smaller than distance SD32, and distance SD43 is smaller than distance SD33. In other words, when surface 101 is compressed, the distances between the capsules 210A, 210B, and 210C of elastic unit 200A and the buffer blocks 140A, 140B, and 140C are all smaller than the distances when surface 101 is not compressed.

[0045] In this embodiment, since the initial spacings SD31, SD32, and SD33 are the same, when the elastic unit 200A is compressed, the bladders 210A, 210B, and 210C will simultaneously contact the buffer blocks 140A, 140B, and 140C, as shown in part (B) of Figure 6. At this time, the spacings SD41, SD42, and SD43 are zero, thereby providing one-time strong support. It is worth mentioning that when the bladders 210A, 210B, and 210C are under maximum support force (spacings SD41, SD42, and SD43 are zero), the configuration ratio of each group of bladders / buffer blocks (here, the three groups 210A / 140A, 210B / 140B, and 210C / 140C) in the height direction is not the same, so the hardness of the sole 10B in this state exhibits a point-like difference distribution, which is beneficial for optimizing the shock absorption of the sole. Similarly, when the user needs more support from the sole 10B, the optical unit 300A can be exposed to the light source, which increases the pressure inside the bladders 210A, 210B and 210C to provide greater elasticity.

[0046] As can be seen from the above, in this embodiment, the height matching between the bladders 210A, 210B and 210C and their respective buffer blocks 140A, 140B and 140C makes the spacing SD31, SD32 and SD33 equal when the surface 101 is not under pressure, which is beneficial to provide a strong one-piece support. Furthermore, due to the different structures and materials of the bladders 210A, 210B, and 210C and the cushioning blocks 140A, 140B, and 140C, the elasticity provided per unit height of the bladders 210A, 210B, and 210C differs from that provided per unit height of the cushioning blocks 140A, 140B, and 140C. In this embodiment, the different height ratios of the bladders 210A, 210B, and 210C with their respective cushioning blocks 140A, 140B, and 140C also facilitate the different elasticities provided when the bladder 210A contacts the cushioning block 140A, when the bladder 210B contacts the cushioning block 140B, and when the bladder 210C contacts the cushioning block 140C. This allows for different elasticity configurations at different locations on the sole 10B, thus meeting different usage requirements (e.g., suitable for shoes for different types of sports).

[0047] In Figure 6, the number, shape, and size of buffer blocks 140A, 140B, and 140C correspond to the number, shape, and size of capsules 210A, 210B, and 210C. In this embodiment, the number of buffer blocks 140A, 140B, and 140C is the same as the number of capsules 210A, 210B, and 210C. Capsules 210A, 210B, and 210C are configured as cylinders, and buffer blocks 140A, 140B, and 140C are also configured as cylinders corresponding to capsules 210A, 210B, and 210C. Furthermore, the diameters (unless otherwise labeled) of the cushioning blocks 140A, 140B, and 104C can be equal to, respectively, the diameter D11 of the bladder 210A (see Figure 4), the diameter D12 of the bladder 210B (see Figure 4), and the diameter D13 of the bladder 210C (see Figure 4), but are not limited thereto. The number, shape, and size of the cushioning blocks can be adjusted according to actual needs so that the sole 10B can provide the required elasticity. For example, in some embodiments, the number of cushioning blocks can be less than the number of bladders, that is, when the surface 101 is compressed, some bladders contact the cushioning blocks, and some bladders contact the bottom of the chamber 130A. In other words, whether the number of cushioning blocks is equal to or less than the number of bladders, it falls within the scope of protection of this invention.

[0048] Please refer to Figure 7, which is a partial cross-sectional view of the sole 10C before and after compression according to another embodiment of the present invention. The viewing angle is the same as that of Figure 4. The main difference between the sole 10C in Figure 7 and the sole 10B in Figure 6 is that the height configuration of the capsules 210D, 210E and 210F of the elastic unit 200C is different from that of the capsules 210A, 210B and 210C of the elastic unit 200A, and the height configuration of the buffer blocks 140D, 140E and 140F is different from that of the buffer blocks 140A, 140B and 140C.

[0049] As shown in part (A) of Figure 7, buffer blocks 140D, 140E, and 140F are integrally formed on the first layer 110C of the body 100C, and buffer blocks 140D, 140E, and 140F correspond to capsules 210D, 210E, and 210F, respectively. When surface 101 is not under pressure, capsules 210D, 210E, and 210F have heights H31, H32, and H33, respectively, and heights H31, H32, and H33 are the same. Buffer blocks 140D, 140E, and 140F have heights H41, H42, and H43, respectively, with height H42 being greater than height H41, and height H41 being greater than height H43. The capsules 210D, 210E and 210F are respectively spaced SD51, SD52 and SD53 with the buffer blocks 140D, 140E and 140F, and the spaced SD51, SD52 and SD53 are different.

[0050] As shown in part (B) of Figure 7, when surface 101 is compressed, the bladders 210D, 210E, and 210F have spacings SD61, SD62, and SD63 between themselves and the buffer blocks 140D, 140E, and 140F, respectively. Spacing SD61 is smaller than spacing SD51, spacing SD62 is smaller than spacing SD52, and spacing SD63 is smaller than spacing SD53. In other words, when surface 101 is compressed, the spacing between the bladders 210D, 210E, and 210F of elastic unit 200C and the buffer blocks 140D, 140E, and 140F is smaller than the spacing when surface 101 is not compressed.

[0051] Due to the different initial spacings SD51, SD52, and SD53, when the elastic unit 200C is compressed along with the surface 101, the capsules 210E, 210D, and 210F will sequentially contact the cushioning blocks 140E, 140D, and 140F, respectively. In this way, the sole 10C also helps to provide multi-stage progressively enhanced elasticity, but unlike the sole 10A, the sole 10C can use a uniformly manufactured elastic unit 200C. Similarly, when the user needs more support from the sole 10C, the optical unit 300A can be exposed to a light source, increasing the pressure inside the capsules 210D, 210E, and 210F to provide greater elasticity.

[0052] As can be seen from the above, the embodiment in Figure 7 utilizes the fact that the heights of the bladders 210D, 210E, and 210F are the same, while the heights of the cushioning blocks 140D, 140E, and 140F are different, thus creating different spacings SD51, SD52, and SD53, thereby providing multi-segment support. In practical applications, depending on the purpose and intended use of the sole 10C (e.g., for sports footwear), the heights of the bladders 210D, 210E, and 210F themselves and the cushioning blocks 140D, 140E, and 140F themselves can be appropriately adjusted to change the order in which the bladders 210D, 210E, and 210F contact the cushioning blocks 140D, 140E, and 140F, resulting in different cushioning effects.

[0053] As can be seen from Figures 4 to 7, when the elastic unit contains multiple bladders, the distance between the bladder and the bottom or buffer block can be controlled by controlling the height of the bladder, whether a buffer block is provided on the bottom surface of the chamber, and the height of the buffer block. This allows for different cushioning strokes (multi-segment support) and increased elasticity (progressive support or one-time support). In addition, by appropriately designing the sequence in which the bladders at different positions touch the bottom or buffer block and the elasticity provided by the bladders at different positions touching the bottom or buffer block, it is beneficial to meet different usage needs (such as shoes suitable for different types of sports or optimized elastic configurations for different users' individual needs).

[0054] Please refer to Figure 8, which is a partial cross-sectional schematic diagram of the sole 10D according to another embodiment of the present invention. The viewing angle of Figure 8 is the same as that of Figure 3, and only the left half of the sole 10D is shown. The main difference between the sole 10D and the sole 10A is that the positions of the opening 134D of the chamber 130D and the optical unit 300A are different from those of the opening 134A and the optical unit 300A of the chamber 130A. In addition, the fitting portion EP of the body 100D extends to the left to the flange portion FP. In detail, the chamber 130D is formed in the body 100D, the chamber 130D includes an opening 132D formed on the surface 101, the elastic unit 200A is fitted into the chamber 130D corresponding to the opening 132D, the chamber 130D further includes an opening 134D formed on the surface 102, and the optical unit 300A is disposed in the chamber 130D corresponding to the opening 134D. The chamber 130D extends through the body 100D in a vertical direction (e.g., parallel to the normal vector of surface 102), that is, the chamber 130D extends through the first layer 110D and the second layer 120D of the body 100D. Furthermore, openings 132D and 134D are opposite to each other. In other words, the sole 10D provides a different position for light L to be irradiated than the sole 10A.

[0055] Please refer to Figure 9, which is a partial cross-sectional schematic diagram of the sole 10E according to another embodiment of the present invention. The viewing angle of Figure 9 is the same as that of Figure 3, and only the left half of the sole 10E is shown. The main difference between the sole 10E and the sole 10A is that the chamber 130E contains only one opening 132E, and the type of lens 310E and the arrangement position of the optical unit 300E are different from those of the lens 310A and the arrangement position of the optical unit 300A. In addition, the fitting portion EP of the body 100E extends to the left to the flange portion FP. In detail, the chamber 130E is formed in the first layer 110E of the body 100E. The chamber 130E includes an opening 132E formed on the surface 101. The elastic unit 200A is embedded in the chamber 130E corresponding to the opening 132E. The optical unit 300E is disposed on the surface of the elastic unit 200A away from the chamber 130E, which in this case is the upper surface of the elastic unit 200A. The lens 310E is a convex lens in this case, but is not limited to this. That is to say, the position where the light L is irradiated by the sole 10E is different from that of the soles 10A and 10D.

[0056] It is worth mentioning that the three optical unit arrangements illustrated in soles 10A, 10D, and 10E are not mutually exclusive. In practical applications, these three different arrangements can be integrated into the same sole. For example, the sole may include a body, an elastic unit with light transmission properties (e.g., light transmittance), and three optical units. A chamber is formed in the body and includes three openings formed on the top, bottom, and side surfaces of the body, respectively. The elastic unit is embedded in the opening on the top surface, and the three optical units are respectively located in the openings on the side, bottom, and upper surfaces of the elastic unit away from the chamber. In this way, the sole can provide three locations for light to illuminate the space containing the elastic unit at one time. It is understood that the three optical unit arrangements illustrated in soles 10A, 10D, and 10E can also integrate only any two of them, depending on the requirements.

[0057] Please refer to Figure 10, which is a partial cross-sectional schematic diagram of the sole 10F according to another embodiment of the present invention. The viewing angle of Figure 10 is the same as that of Figure 3, and only the left half of the sole 10F is shown. The main difference between the sole 10F and the sole 10A is that the optical unit 300F and the optical unit 300A have different structures, and the body 100F further includes the bottom surface 136F of the self-contained chamber 130F of the cushioning block 140G protruding towards the surface 101. In addition, the fitting portion EP of the body 100F extends to the left to the flange portion FP.

[0058] In detail, a chamber 130F is formed on the body 100F, wherein the chamber 130F includes an opening 132F formed on the surface 101, and an elastic unit 200A is embedded in the chamber 130F corresponding to the opening 132F. The chamber 130F may further include an opening 134F formed on the surface 103, and an optical unit 300F is disposed in the chamber 130F corresponding to the opening 134F. The optical unit 300F includes a base BP and a lens 310F. The base BP is fixed to the first chamber 130F, and the lens 310F protrudes from the base BP in a direction away from the chamber 130F and is used to allow light L to pass through and be focused on the receiving space 212A. The lens 310F is exemplified here as a Fresnel lens, but is not limited thereto. The optical unit 300F can be manufactured, for example, by die-cutting or injection molding, so the base BP and the lens 310F can be integrally formed.

[0059] The base BP may include a first part BP1 and a second part BP2. The first part BP1 is connected to the lens 310F and bent relative to the lens 310F, exemplified here as a vertical bend. The second part BP2 is connected to the first part BP1 and bent relative to the first part BP1, exemplified here as a vertical bend. The second part BP2 is fixed to the inner vertical surface of the chamber 130F, and the first part BP1 is fixed to the inner horizontal surface of the chamber 130F. By stacking the first part BP1 and the body 100F in the horizontal direction, and stacking the second part BP2 and the body 100F in the vertical direction, a larger bonding area can be provided, which is beneficial to improving the bonding stability between the optical unit 300F and the body 100F.

[0060] The buffer block 140G is a composite structure comprising a block portion 141G and a covering portion 142G. The block portion 141G is formed by protruding upwards from the first layer 110F of the body 100F, that is, the block portion 141G is integrally formed on the first layer 110F of the body 100F. The covering portion 142G covers the block portion 141G. The material of the covering portion 142G may be different from that of the block portion 141G to provide different hardness and further adjust the supporting force generated when the bladder 210A contacts the buffer block 140G. In addition, the color of the covering portion 142G may be different from that of the block portion 141G for a decorative effect. For example, in some embodiments, the user can observe the buffer block 140G through the lens 310F. In other embodiments, the sole 10F can be the sole of a sandal. In this case, no other material layer is provided on the sole 10F that would obscure the bladder 210A. With the flexible sheets FS1 and FS2 being made of transparent material, the user can observe the cushioning block 140G through the bladder 210A. By using a color different from the block portion 141G or the first layer 110F, different visual effects can be provided, enhancing the aesthetics of the sole 10F.

[0061] Please refer to Figure 11, which is a partial cross-sectional schematic diagram of the sole 10G according to another embodiment of the present invention. The viewing angle of Figure 11 may be the same as that of Figure 3, and only the left half of the sole 10G is shown. The main difference between the sole 10G and the sole 10F lies in the different structures of the flexible sheet FS2A and the flexible sheet FS2, and the different bonding method between the flexible sheet FS2A and the body 100F compared to the bonding method between the flexible sheet FS2 and the body 100F.

[0062] As shown in Figure 11, the body 100F includes a flange portion FP formed on the periphery of the body 100F. The flange portion FP has an inner surface FP1 connected to the surface 101. The flexible sheet FS2A includes a peripheral portion PP2 fixed to the inner surface FP1. This helps to improve the bonding stability between the elastic unit 200A and the body 100F.

[0063] Please refer to Figure 12, which is a top view of the sole 10H according to another embodiment of the present invention. The main difference between the sole 10H and the sole 10A in Figure 1 is that the elastic unit 200H and the elastic units 200A and 200B have different structures, and the number and shape of the fitting part EP are adapted to the elastic unit 200H. The elastic unit 200H includes a plurality of bladders 210H arranged in two rows and disposed in different chambers 130A and 130B. Here, there are six bladders 210H, of which three bladders 210H are arranged in one row in chamber 130A and the other three bladders 210H are arranged in another row in chamber 130B. The optical unit 300A (see Figure 3) is disposed in the bladders 210H in chamber 130A, and the optical unit 300B (see Figure 3) is disposed in the bladders 210H in chamber 130B. In other words, the elastic unit 200H spans the left and right halves of the sole 10H, providing a strengthening and balancing effect. In this embodiment, one elastic unit corresponds to a plurality of optical units, and some of the capsules within the same elastic unit are disposed in different chambers; all of the above fall within the scope of protection of this invention.

[0064] In Figure 12, each capsule 210H defines a receiving space 212H, and a fluid 214H is disposed in the receiving space 212H. The structure (e.g., shape and size) of the plurality of capsules 210H and the type of fluid 214H in the plurality of capsules 210H may be the same or different. In addition, the body 100H may further include at least one buffer block (not shown) corresponding to at least one capsule 210H. Other details regarding the capsules 210H, buffer blocks, and sole 10H can be found in the relevant descriptions of soles 10A to 10G above, and will not be repeated here.

[0065] Referring to Figures 13 and 14, Figure 13 is a top view of a shoe sole 10I according to another embodiment of the present invention, and Figure 14 is a side view of the shoe sole 10I in Figure 13. The main difference between the shoe sole 10I and the shoe sole 10A in Figure 1 is that the structures of the chambers 130I, elastic units 200I, and optical units 300I of the body 100I are different from those of chambers 130A and 130B, elastic units 200A and 200B, and optical units 300A and 300B. In Figure 13, from the top view of the shoe sole 10I, the chamber 130I has a U-shaped shape and includes an opening 132I formed on the surface 101. The elastic unit 200I includes a plurality of bladders 210I corresponding to the openings 132I embedded in the chamber 130I. In other words, from the top view of the shoe sole 10I, the plurality of bladders 210I are arranged to form a U-shaped pattern. In this embodiment, the purpose of the elastic unit 200I being located at the heel of the sole 10I is to enhance the rebound force for the user's heel. However, it is not limited to this. In other embodiments, the elastic unit 200I may also be located at the toe or midsection of the sole 10I.

[0066] In Figure 14, the body 100I includes a first layer 110I and a second layer 120A. The chamber 130I may further include an opening 134I formed on the surface 103, and an optical unit 300I is disposed in the chamber 130I corresponding to the opening 134I. The optical unit 300I is provided with a plurality of lenses 310I corresponding to a plurality of capsules 210I. Here, the opening 134I is formed in the rear half of the surface 103 (i.e., the heel portion of the sole 10I), and the opening 134I extends from the left side of the surface 103 through the rear side to the right side, that is, the opening 134I is a U-shaped opening that partially surrounds the heel portion of the sole 10I. The optical unit 300I also extends from the left side of the surface 103 through the rear side to the right side, that is, the optical unit 300I is a U-shaped optical unit that partially surrounds the heel portion of the sole 10I.

[0067] <Shoes>

[0068] Figure 15 is a side view of a shoe 1 according to another embodiment of the present invention. The shoe 1 includes the aforementioned sole 10A, and optionally includes an upper 20 and shoelaces 30. Here, the upper 20 defines a foot space (not shown) and a shoe opening H communicating with the foot space. The upper 20 may include a plurality of eyelets 21 for the shoelaces 30 to pass through. The sole 10A is fixed to the side of the upper 20 opposite to the shoe opening H. Details regarding the sole 10A can be found in the above description and will not be repeated here. In addition, the sole 10A may also be replaced by soles 10B, 10C, 10D, 10E, 10F, 10G, 10H or 10I.

[0069] In Figure 15, shoe 1 is taken as an example of a closed shoe, but it is not limited thereto. In other embodiments, the sole 10A can be the sole of other types of shoes, such as sneakers, leather shoes, hiking boots, boots, sandals, slippers, etc., but is not limited thereto. On the other hand, the structure of the upper 20 can be flexibly adjusted according to the type of shoe 1. The upper 20 can be formed of any suitable material to accommodate, fix or cover the foot above the sole 10A, and the upper 20 can cooperate with braids, straps or other fasteners to adjust the fit of the upper 20 around the user's foot.

[0070] Compared with the prior art, the present invention uses a first optical unit to correspond to a first elastic unit. The first optical unit can transmit the energy of light through the first capsule to the first fluid, thereby changing the temperature and volume of the first fluid, and thus changing the pressure inside the first capsule. This allows the elasticity provided by the first elastic unit to be adjusted, which is beneficial for the sole to provide different elasticity according to different usage needs.

[0071] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made in accordance with the scope of the patent application of the present invention shall be covered by the present invention.

Claims

1. A shoe sole comprising: a body having flexibility; a first elastic unit embedded in the body, wherein the first elastic unit includes a first bladder defining a first receiving space and a first fluid disposed in the first receiving space, at least a portion of the first bladder having light energy transmission capability; and a first optical unit disposed corresponding to the first elastic unit, wherein at least a portion of the first optical unit is used to transmit the energy of a light through the first bladder to the first fluid.

2. The sole as claimed in claim 1, wherein at least a portion of the first optical unit is provided with a first lens, and the first lens is used to allow light to pass through and be focused in the first receiving space.

3. The sole as claimed in claim 2, wherein the first lens is a convex lens or a Fresnel lens.

4. The sole as described in claim 1, wherein the number of the first bladder is two.

5. The sole as claimed in claim 4, wherein at least a portion of the first optical unit is provided with two first lenses corresponding to the two first capsules.

6. The sole as claimed in claim 1, wherein the body comprises: a first surface; a second surface opposite to the first surface; a third surface connected between the first surface and the second surface; and a first chamber formed in the body, wherein the first chamber includes a first opening formed in the first surface, and the first elastic element is embedded in the first chamber corresponding to the first opening.

7. The sole as claimed in claim 6, wherein the first chamber further includes a second opening formed on the third surface, and the first optical unit is disposed in the first chamber corresponding to the second opening.

8. The sole as claimed in claim 6, wherein the first chamber further includes a second opening formed on the second surface, and the first optical unit is disposed in the first chamber corresponding to the second opening.

9. The sole as claimed in claim 6, wherein the first optical unit is disposed on a surface of the first elastic unit away from the first chamber.

10. The sole of any one of claims 6 to 9, wherein the first chamber has a first bottom end remote from the first surface, a first gap is formed between the first chamber and the first bottom end when the first surface is not under pressure, and a second gap is formed between the first chamber and the first bottom end when the first surface is under pressure, and the second gap is smaller than the first gap.

11. The sole as claimed in claim 7 or 9, wherein the first chamber has a first bottom surface away from the first surface, the body further includes a cushioning block protruding from the first bottom surface toward the first surface, wherein when the first surface is not compressed, there is a first gap between the first chamber and the cushioning block, and when the first surface is compressed, there is a second gap between the first chamber and the cushioning block, and the second gap is smaller than the first gap.

12. The sole as claimed in any one of claims 6 to 9, wherein there are two first bladders, the first chamber having a first bottom end away from the first surface, wherein when the first surface is not under pressure, the distance between the two first bladders and the first bottom end is different, and when the first surface is under pressure, the distance between the two first bladders and the first bottom end becomes smaller.

13. The sole as claimed in claim 7 or 9, wherein there are two first bladders, the first chamber has a first bottom surface away from the first surface, and the body further includes two cushioning blocks protruding from the first bottom surface toward the first surface and corresponding to the two first bladders.

14. The sole as claimed in claim 6, wherein, from a top view of the sole, the first chamber has a U-shaped shape, the first chamber further includes a second opening formed on the third surface, the number of first bladders is a plurality of, the plurality of first bladders are disposed in the first chamber corresponding to the first opening, the first optical unit is disposed in the first chamber corresponding to the second opening, and at least a portion of the first optical unit is provided with a plurality of first lenses corresponding to the plurality of first bladders.

15. The sole as claimed in claim 1, wherein the first elastic unit further includes a second bladder defining a second receiving space and a second fluid disposed in the second receiving space, at least a portion of the second bladder being light-transmitting, the sole further including a second optical unit corresponding to the second bladder, and at least a portion of the second optical unit being configured to transmit energy of another light ray through the second bladder to the second fluid.

16. The sole as claimed in claim 1, further comprising: a second elastic unit embedded in the body, wherein the second elastic unit includes a second capsule defining a second receiving space and a second fluid disposed in the first receiving space, at least a portion of the second capsule having light-transmitting properties; and a second optical unit disposed opposite to the second elastic unit, wherein at least a portion of the second optical unit is used to transmit energy of another light ray through the second capsule to the second fluid.

17. The sole of claim 16, wherein the body comprises: a first surface; a second surface opposite to the first surface; a third surface connected between the first surface and the second surface; a first cavity formed in the body, wherein the first cavity includes a first opening formed in the first surface and a second opening formed in the third surface, the first elastic unit being disposed in the first cavity corresponding to the first opening, and the first optical unit being disposed in the first cavity corresponding to the second opening; and a second cavity formed in the body, wherein the second cavity includes a third opening formed in the first surface and a fourth opening formed in the third surface and disposed opposite to the second opening, the second elastic unit being disposed in the second cavity corresponding to the third opening, and the second optical unit being disposed in the second cavity corresponding to the fourth opening.

18. The sole of claim 17, wherein the first chamber has a first bottom surface away from the first surface, the second chamber has a second bottom surface away from the first surface, and when the first surface is not under pressure, the first bladder has a first gap between itself and the first bottom surface and the second bladder has a second gap between itself and the second bottom surface; when the first surface is under pressure, the first bladder has a third gap between itself and the first bottom surface and the second bladder has a fourth gap between itself and the second bottom surface, wherein the third gap is smaller than the first gap and the fourth gap is smaller than the second gap.

19. The sole as claimed in any one of claims 6, 7, 8, 9, 14, 17 and 18, wherein the first bladder is formed by connecting a first flexible piece and a second flexible piece, the first flexible piece including a first peripheral portion and a first recess, the first peripheral portion being fixed to the first surface, the first recess being recessed from the first peripheral portion toward the second surface and located in the first accommodating chamber and defining a first cavity, and the second flexible piece closing the first cavity to form the first receiving space.

20. The sole as claimed in claim 19, wherein the body further includes a flange formed on a periphery of the body, the flange having an inner surface connected to the first surface, and the second flexible sheet including a second peripheral portion fixed to the inner surface.

21. The sole as claimed in any one of claims 7, 8, 14, 17 and 18, wherein the first optical unit includes a base and a first lens, the base being fixed to the first cavity, and the first lens protruding from the base in a direction away from the first cavity and for allowing light to pass through and be focused in the first receiving space.

22. The sole as claimed in claim 1, wherein the body is made of a first thermoplastic resin, a thermosetting resin, or a combination thereof, the first capsule is made of a second thermoplastic resin, the first fluid is a gas, and the first optical unit is made of a third thermoplastic resin.

23. A shoe comprising: a sole as described in any one of claims 1 to 22.

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