Hinge structure and foldable electronic device comprising same

Abstract

Disclosed are a hinge structure and a foldable electronic device comprising same, the hinge structure comprising: a first rotary member rotating about a first axis; a first arm member rotating in correspondence to the rotation of the first rotary member; a second rotary member rotating about a second axis; a second arm member rotating in correspondence to the rotation of the second rotary member; and a first link member fastened to the first rotary member and the first arm member, wherein the first rotary member comprises a first rail protrusion formed on a first side of the first rotary member and a first rail groove formed on a second side disposed in the opposite direction of the first side of the first rotary member, the first rail protrusion protrudes from the surface of the first side, and the first rail groove is formed engraved in the surface of the second side.

Description

Hinge structure and foldable electronic device including the same

[0001] Various embodiments of the present document relate to a foldable electronic device including a hinge structure.

[0002] Portable electronic devices, such as smartphones, can support calling and various content search functions based on various applications. Portable electronic devices can display screens corresponding to each function while providing these various functions. Users may desire a wider screen when utilizing these various functions. In typical portable electronic devices, expanding the display for screen display requires increasing the overall size of the device, which can reduce portability. Accordingly, foldable portable electronic devices with foldable displays have been developed to increase screen size while maintaining portability. These foldable portable electronic devices can be configured in both folded and unfolded states.

[0003] A foldable electronic device having a hinge structure may include a plurality of housings capable of supporting respective areas of a display in an unfolded state, and a hinge structure connecting the plurality of housings to each other. The hinge structure may connect the plurality of housings while the plurality of housings are in a folded or unfolded state, and may support the housings to be held at a specific angle.

[0004] The above information may be provided as background information to aid in understanding this document. None of the above is claimed to be prior art related to this document or can be used to determine prior art.

[0005] According to various embodiments of the present disclosure, a foldable electronic device (or a portable electronic device, a portable communication device, a foldable electronic device, or a foldable electronic device having a communication function) may include a first rotational member that rotates about a first axis, a first arm member that rotates in response to the rotation of the first rotational member, a second rotational member that rotates about a second axis, a second arm member that rotates in response to the rotation of the second rotational member, and a first link member that is connected to the first rotational member and the first arm member, wherein the first rotational member includes a first rail protrusion formed on a first side surface of the first rotational member, a first rail groove formed on a second side surface of the first rotational member that is disposed in an opposite direction to the first side surface, a hinge structure in which the first rail protrusion protrudes from a surface of the first side surface, and the first rail groove is formed to be engraved from a surface of the second side surface, a first housing and a second housing that are hinged by the hinge structure, and a display that is folded or unfolded by the hinge operation.

[0006] FIG. 1 is a perspective view showing an example of an unfolded and folded state of a foldable electronic device according to various embodiments.

[0007] FIG. 2 is a drawing showing an example of an exploded perspective view of a part of a configuration of an unfolded state of a foldable electronic device according to various embodiments.

[0008] FIG. 3 is a drawing showing an example of a first type hinge structure of a foldable electronic device according to one embodiment.

[0009] FIG. 4 is a drawing showing an exploded perspective view of a first type hinge structure according to one embodiment.

[0010] FIG. 5 is a drawing showing an example of a configuration of a first link member, a first arm member, and a first rotation member according to one embodiment.

[0011] FIG. 6 is a drawing showing an example of a first link member according to one embodiment.

[0012] FIG. 7 is a drawing showing an example of a first arrangement state of a first rotating member according to one embodiment.

[0013] FIG. 8 is a drawing showing an example of a second arrangement state of a first rotating member according to one embodiment.

[0014] FIG. 9 is a drawing showing an example of a first arrangement state of a first arm member according to one embodiment.

[0015] FIG. 10 is a drawing showing an example of a second arrangement state of a first arm member according to one embodiment.

[0016] FIG. 11 is a drawing showing an example of a first link cover configuration according to one embodiment.

[0017] FIG. 12 is a drawing showing an example of an upper surface of a part of a first type hinge structure (201) according to one embodiment.

[0018] FIG. 13 is a drawing showing an example of a side view of a part of a first type hinge structure according to one embodiment.

[0019] Fig. 14 is a drawing showing an example of an exploded state of a part of the first type hinge structure of Fig. 12.

[0020] FIG. 15 is a drawing showing an example of a cross-section 15A`-15A of a part of a first type hinge structure according to one embodiment.

[0021] FIG. 16 is a drawing showing an example of a configuration of a second type hinge structure according to one embodiment.

[0022] FIG. 17 is a drawing showing an example of a third link cover and a fourth link cover among the second type hinge structures according to one embodiment.

[0023] FIG. 18 is a drawing showing an example of a cross-section of a second type hinge structure according to one embodiment.

[0024] FIG. 19 is a drawing showing an example of a cross-section of a second type hinge structure according to one embodiment.

[0025] FIG. 20 is a drawing showing an example of a configuration of a third type hinge structure according to one embodiment.

[0026] FIG. 21 is a drawing showing an example of a third rotating member according to one embodiment.

[0027] FIG. 22 is a drawing showing an example of a cross-section of one side of a third type hinge structure according to one embodiment.

[0028] FIG. 23 is a drawing showing an example of a configuration of a fourth type hinge structure according to one embodiment.

[0029] FIG. 24 is a drawing showing an example of a cross-section taken along the 23A-23A` cutting line of a fourth type hinge structure according to one embodiment.

[0030] Hereinafter, various embodiments of this document are described with reference to the attached drawings.

[0031] Hereinafter, various embodiments of the present document may generate movement while a portable electronic device is operating in a folded or unfolded state due to a gap between various structures included in a hinge structure. Such movement may cause discomfort to the user and may reduce the lifespan of the portable electronic device. Various embodiments of the present document improve the movement described above, thereby supporting a more stable hinge operation of the portable electronic device. For example, at least some of the various embodiments of the present document suggest a device that can support a more robust hinge operation by reducing the gap between structures that generate movement or reducing the movement of rotating structures. Such portable electronic devices may include portable electronic devices such as smartphones, tablets, notebooks, slate PCs, or laptops, and may support calling functions and various content providing functions based on various types of applications.

[0032] A foldable electronic device including a hinge structure according to an embodiment, as described below, includes a dumbbell-shaped folding structure (or a folding structure in which a folding area of ​​a display has a teardrop shape and a separation angle between housings is maintained constant), and supports folding of the foldable electronic device with a parallel gap. The hinge structure of the present disclosure can support improved hinge performance by improving the clearance.

[0033] In addition, various purposes and effects provided by the foldable electronic device including the improved hinge structure according to various embodiments may be mentioned according to the embodiments of the detailed description.

[0034] FIG. 1 is a drawing showing an example of a perspective view of an unfolded and folded state of a foldable electronic device according to various embodiments, and FIG. 2 is a drawing showing an example of an exploded perspective view of a part of a foldable electronic device in an unfolded state according to various embodiments.

[0035] Referring to FIGS. 1 and 2, a foldable electronic device (100) (or electronic device, portable electronic device, portable communication device, foldable communication device) according to an embodiment may include housings (or housings) including a first housing (110) (or a first housing portion) and a second housing (120) (or a second housing portion), a display (160) (e.g., a flexible display), and a hinge housing (150) in which a hinge structure (200a, 200b) (or a hinge structure, a hinge assembly, a gear assembly) is disposed inside. FIG. 1 is a perspective view showing a flat state (or, an unfolded state or an unfolded state) of the foldable electronic device (100) and a perspective view of a folded state, and FIG. 2 is a perspective view showing an exploded state of some components of the foldable electronic device (100) in an unfolded state. Additionally or alternatively, the foldable electronic device (100) may further include a first cover (110r) covering the rear side of the first housing (110) and a second cover (120r) covering the rear side of the second housing (120). Alternatively, a separate auxiliary display may be further arranged on at least one of the rear side of the first housing (110) and the rear side of the second housing (120).

[0036] According to various embodiments, the first housing (110) may be arranged continuously with the second housing (120) depending on the arrangement state (e.g., when the center portion (160c) of the display (160) is flattened or when the housings are in an unfolded state) or may be arranged parallel to the second housing (120). Alternatively, when the center portion (160c) of the display (160) is folded, one side of the first housing (110) may be arranged to face one side of the second housing (120).

[0037] The first housing (110) may be formed, for example, at least in part, of a metal material, or at least in part, of a non-metal material. For example, the first housing (110) may be formed of a material having a certain rigidity to support at least a part of the display (160). A region of the display (160) (e.g., an upper portion (160a) (or an area in the x-axis direction, the first area) of the display (160) and a part of the center portion (160c)) may be disposed on at least a part of the front surface of the first housing (110). At least a part of the first housing (110) may be adhered to the upper portion (160a) of the display (160). Alternatively, at least a portion of the edge of the front surface (e.g., one side facing the z-axis direction, or one side facing the front surface of the display (160)) of the first housing (110) may surround the edge of the upper portion (160a) of the display (160) and be adhered to at least a portion of the upper portion (160a) of the display (160). Alternatively, one upper front side of the first housing (110) may be adhered to one upper portion (160a) of the display (160). In this regard, an adhesive layer (or adhesive material, adhesive tape) may be disposed on at least a portion between the first housing (110) and the upper portion (160a) of the display (160). At least a portion of the inside of the first housing (110) is provided in a hollow form or is provided in a hollow form while being combined with the first cover, so that electronic elements required for driving the display (160) (e.g., at least one of elements such as a printed circuit board, at least one processor arranged on the printed circuit board, at least one memory, and a battery) can be arranged.

[0038] According to various embodiments, the edge ends of the first housing (110) (e.g., the three edge ends excluding the edge facing the second housing (120)) may protrude from the bottom surface of the center of the housing by a specified height so as to surround at least one edge of the display (160). Alternatively, side walls may be arranged on at least one portion of the edge ends of the first housing (110), at least a portion of which faces the edge of the display (160). The side walls formed on at least a portion of the edge of the first housing (110) may be formed with a specified height from the three edges excluding the edge facing the second housing (120). The edge portion of the first housing (110) facing the second housing (120) may include a sunken portion having at least a certain curvature so that at least a portion of the hinge housing (150) and at least a portion of the hinge structures (200a, 200b) disposed (or positioned, secured) on the hinge housing (150) may be disposed. For example, the first housing (110) may include a first step portion (111) (or first curved portion) on the edge portion facing the second housing (120) so that at least a portion of the first hinge structure (200a) and the second hinge structure (200b) may be disposed (or positioned, secured) on the first step portion (111) and the second curved portion.

[0039] According to various embodiments, the second housing (120) may be arranged parallel to the first housing (110) depending on the arrangement, or may be arranged so that at least one side faces one side of the first housing (110) (e.g., the side on which the display (160) is arranged). The second housing (120) may be made of the same material as the first housing (110). For example, at least a part of the second housing (120) may be formed of a metal material, and at least a remaining part may be formed of a non-metallic material (e.g., an injection-molded material). Since the second housing (120) is arranged in a form symmetrical with respect to the first housing (110) in the left-right or up-down direction, the front side may be arranged to support at least a part of the remaining part of the area of ​​the area arranged in the first housing (110) among the display (160) (e.g., the lower part (160b) of the display (160) (or the second area in the -x-axis direction) and the other side of the central part (160c)). At least a portion of the second housing (120) may be bonded to the lower portion (160b) of the display (160). Alternatively, the front edge of the second housing (120) may be bonded to the lower portion (160b) of the display (160). Alternatively, one side of the lower portion of the front of the second housing (120) may be bonded to one side of the lower portion (160b) of the display (160). In this regard, an adhesive layer may be disposed between at least a portion of the second housing (120) and the lower portion (160b) of the display (160). At least a portion of the inner portion of the second housing (120) may be provided in a hollow form similar to the first housing (110), or may be provided in a hollow form while being coupled with the second cover (120r), so that electronic elements necessary for driving the display (160) may be disposed therein.

[0040] According to various embodiments, the edge ends of the second housing (120) (e.g., the three edge ends excluding the edge facing the first housing (110)) may protrude a specified height from the bottom surface of the center of the second housing (120) to surround the other edge of the display (160). Alternatively, at least one portion of the edge ends of the second housing (120) may be provided with side walls that at least partially face the edge of the display (160), similar to the side walls formed on the first housing (110). The side walls formed on at least a portion of the edge of the second housing (120) may be formed with a specified height from the three edges excluding the edge facing the first housing (110).

[0041] The portion of the second housing (120) facing the first housing (110) may include a sunken portion having at least a certain curvature so that the hinge housing (150) and the hinge structures (200a, 200b) at least partially disposed (or positioned, secured) on the hinge housing (150) may be disposed. For example, the second housing (120) may include a second step portion (121) (or second curved portion) on which at least a portion of the first hinge structure (200a) and the second hinge structure (200b) are disposed (or positioned, secured) at the edge portion facing the first housing (110).

[0042] According to various embodiments, the foldable electronic device (100) may be disposed on one side of the first housing (110) or the second housing (120) and may include at least one sensor related to the operation of a specific function of the foldable electronic device (100). The sensor may include, for example, at least one of a proximity sensor, an illuminance sensor, an iris sensor, an image sensor (or a camera), or a fingerprint sensor.

[0043] According to various embodiments, the hinge housing (150) may be covered by one side of the first housing (110) and the second housing (120) (e.g., when the housings are in an unfolded state) or exposed to the outside (e.g., when the housings are in a folded state) depending on the foldable electronic device (100) being folded or unfolded. For example, as in FIG. 1, when the first housing (110) and the second housing (120) are arranged in parallel (or when the housings (110, 120) are in an unfolded state), the hinge housing (150) may be covered by the first housing (110) and the second housing (120). When one side of the first housing (110) and one side of the second housing (120) are arranged to face each other (or when the housings (110, 120) are in a folded state), the hinge housing (150) may be arranged so that at least a portion of one edge of the first housing (110) and the second housing (120) (e.g., the edge where the first housing (110) and the second housing (120) face each other in the unfolded state) is exposed to the outside.

[0044] According to various embodiments, the display (160) may be provided with at least a portion that is flexible. According to one embodiment, the display (160) may include an upper portion (160a) or a first region disposed on the first housing (110), a lower portion (160b) or a second region disposed on the second housing (120), and a central portion (160c) or a central region where the first housing (110) and the second housing (120) are adjacent. According to various embodiments, the entire display (160) may be flexible. Alternatively, at least a portion of the central portion (160c) of the display (160) may be provided with flexibility. The central portion (160c) of the display (160) may be arranged such that the first housing (110) and the second housing (120) are not adhered to each other. For example, the center portion (160c) of the display (160) may be positioned at a predetermined distance from the front surfaces of the first housing (110) and the second housing (120). The upper portion (160a) of the display (160) may be bonded to at least a portion of the first housing (110), and the lower portion (160b) of the display (160) may be bonded to at least a portion of the second housing (120). In this regard, an adhesive layer may be positioned in at least a portion of the area between the display (160) and the first housing (110), and an adhesive layer (an adhesive layer positioned at a different position from the adhesive layer that contacts at least a portion of the upper portion (160a) of the display (160) and the first housing (110)) may be positioned in at least a portion of the area between the display (160) and the second housing (120). The adhesive layer disposed on the first housing (110) and the adhesive layer disposed on the second housing (120) may be disposed only on the edges of the first housing (110) and the second housing (120).

[0045] According to various embodiments, the hinge structures (200a, 200b) may include a first hinge structure (200a) and a second hinge structure (200b). In the illustrated drawing, the first hinge structure (200a) and the second hinge structure (200b) are arranged on the hinge housing (150), but the present invention is not limited thereto, and three or more hinge structures may be arranged on the hinge housing (150) as needed.

[0046] The first hinge structure (200a) may be arranged on one side of the hinge housing (150) (e.g., the -y-axis edge based on the vertical center line of the foldable electronic device in the illustrated drawing). The first hinge structure (200a) may be coupled to one side of the first housing (110) and the second housing (120) (e.g., the left side based on the vertical center line of the foldable electronic device (e.g., an imaginary line connecting the -x-axis and the x-axis and crossing the center of the display (160))), and may rotate within a specified range based on the horizontal axis of the hinge housing (150) (e.g., the y-axis or the -y-axis). The first hinge structure (200a) may be arranged symmetrically with the second hinge structure (200b) based on the center of the hinge housing (150).

[0047] The second hinge structure (200b) may be arranged on the other side of the hinge housing (150) (e.g., the right side based on the vertical center line of the foldable electronic device in the illustrated drawing). The second hinge structure (200b) is coupled to the other side of the first housing (110) (e.g., the right side based on the vertical center line of the foldable electronic device (e.g., an imaginary line connecting the -x-axis and the x-axis and crossing the center of the display (160))) and the other side of the second housing (120) (e.g., the right side based on the vertical center line of the foldable electronic device), and may rotate within a specified range based on the horizontal axis (or folding axis) of the hinge housing (150). The second hinge structure (200b) may be arranged symmetrically with the first hinge structure (200a) based on the center of the hinge housing (150). This second hinge structure (200b) has the same structure and configuration as the first hinge structure (200a), but may be positioned differently. At least one of the first and second hinge structures (200a, 200b) may include a structure with improved clearance.

[0048] According to one embodiment, the foldable electronic device (100) includes wing plates (131, 132) arranged to be placed on at least one hinge structure (200a, 200b) or combined with at least one hinge structure (200a, 200b) so as to cover at least one surface in the z-axis direction of at least one hinge structure (200a, 200b) when the foldable electronic device (100) is in an unfolded state. The wing plates (131, 132) may be provided in a form separate from the housings (110, 120). Accordingly, a gap may be formed between the wing plates (131, 132) and the housings (110, 120). According to various embodiments, the housings (110, 120) may be provided with grooves in which wing plates (131, 132) can be placed (or fastened, coupled, or seated). The wing plates (131, 132) may be placed to correspond to at least a portion of a lower surface (e.g., a surface in the -z-axis direction, or a surface facing the rear of the display (160)) of a third region (160c) (or a central portion) of the display (160). The wing plates (131, 132) rotate clockwise or counterclockwise according to a hinge operation of at least one hinge structure (200a, 200b). For example, while the first wing plate (131) rotates counterclockwise, the second wing plate (132) can rotate clockwise, and while the first wing plate (131) rotates clockwise, the second wing plate (132) can rotate counterclockwise. The first wing plate (131) can support a flat first surface of the third region (160c) of the display (160) that folds into a dumbbell shape, and the second wing plate (132) can support a flat second surface (a surface symmetrical with respect to the first surface with respect to the z-axis) of the third region (160c) of the display (160) that folds into a dumbbell shape.

[0049] FIG. 3 is a drawing showing an example of a first type hinge structure of a foldable electronic device according to one embodiment, and FIG. 4 is a drawing showing an exploded perspective view of the first type hinge structure according to one embodiment. In FIGS. 3 and 4, the first hinge structure (200a) among the hinge structures (200a, 200b) described in FIGS. 1 and 2 will be described by assigning the drawing number 201. The configuration of the first type hinge structure (201) described in FIGS. 3 and 4 may have the same or similar structure and configuration as the first hinge structure (200a) and the second hinge structure (200b) described in the above.

[0050] Referring to FIGS. 1 to 4, the first type hinge structure (201) includes a fixed bracket (213), a first rotation member (211) (or a first rotation structure, a first rotation part, a first rotation body) that rotates about a first axis (11) (e.g., an imaginary axis in the y-axis direction different from the center of the first shaft (231)), a second rotation member (212) (or a second rotation structure, a second rotation part, a second rotation body) that rotates about a second axis (12) (or a second imaginary axis different from the second shaft (232) and formed parallel to the first axis (11)), a first arm member (221) (or a first arm part, or a first arm structure) that rotates about the center of the first shaft (231) (or the first central axis of the shaft, or the third axis (13)), and a second shaft (232) that rotates about the center of the second shaft (232) (or the second central axis of the second shaft, or the fourth A second arm member (222) (or second arm portion, or second arm structure) that rotates about an axis (14)), a first link portion (215) that fixes (or couples) the first rotation member (211) to the first housing (110) and supports (supports) the rotational motion (or sliding motion) of the first rotation member (211), a third link portion (216) that fixes (or couples) the second rotation member (212) to the second housing (120) and supports the rotational motion (or sliding motion) of the second rotation member (212), a second link portion (223) that fixes the first arm member (221) to the first housing (110) and supports (or supports) the rotational motion (or sliding motion) of the first arm member (221), a fourth link that fixes the second arm member (222) to the second housing (120) and supports (or supports) the rotational motion (or sliding motion) of the second arm member (222) It may include a portion (224). At least a portion of the configuration of the first type hinge structure (201) described above (e.g., at least a portion of the first to fourth link portions (215, 223, 216, 224)) may be omitted.For example, if the first rotating member (211) and the second rotating member (212) are directly coupled to the housings (110, 120), the first link portion (215) and the third link portion (216) may be omitted, and if the female members (221, 222) are directly coupled to the housings (110, 120) without going through the link portions (223, 224), the second link portion (223) and the fourth link portion (224) may be omitted.

[0051] Additionally or alternatively, the first type hinge structure (201) comprises a first main gear (233a) formed (or arranged) on the first shaft (231), a second main gear (233b) formed (or arranged) on the second shaft (232), at least one idle gear (234a, 234b) arranged between the first main gear (233a) and the second main gear (233b), a stopper (236) used to fix the first main gear (233a) and the second main gear (233b), and at least one idle gear (234a, 234b) and prevent the first arm member (221) and the second arm member (222) from rotating more than a specified angle, a shaft fixing member (243) used to fix the first shaft (231) and the second shaft (232), and the first arm member (221) and the second arm It may include a cam member (241) that is coupled to cam structures formed on a member (222) (e.g., a first cam structure of a first arm member (221) and a second cam structure of a second arm member (222), a first elastic member (242a) (or elastic body) and a second elastic member (242b) that provide elasticity to the cam member (241), at least one of a plurality of coupling means (249e1, 249e2) (or fixing clips) and washers (249a, 249b). The cam member (241) may include a first fixed cam part (241a) that is cam-coupled with a first cam structure formed on a part of a first arm member (221), a second fixed cam part (241b) that is cam-coupled with a second cam structure formed on a part of a second arm member (222), and a cam connection part (241c) that connects the first fixed cam part (241a) and the second fixed cam part (241b).

[0052] At least some or all of the components of the first type hinge structure (201) described above may be made of a metal material to have a certain rigidity. Alternatively, if necessary, at least some of the first type hinge structure (201) may be made of a reinforced plastic or resin material. According to various embodiments, at least some of the first type hinge structure (201) described above may be omitted or modified. For example, the gears and the stopper (236) may be omitted. In addition, at least some of the washers (249a, 249b) may be omitted. Alternatively, a specific structure or configuration may be integrated or combined with another structure or configuration. For example, at least some of the link portions (215, 223, 216, 224) may be integrated. As an example, the first link portion (215) and the second link portion (223) may be integrated. The third link part (216) and the fourth link part (224) may be integrated. The link parts (215, 223, 216, 224) of this document will be described by exemplifying a structure in which the first link part (215) and the second link part (223) are integrated to form the first link member (250_1), and the third link part (216) and the fourth link part (224) are integrated to form the second link member (250_2). However, the embodiment of this document is not limited thereto, and the above-described link parts (215, 223, 216, 224) may be provided in an independent and separate form, or may be provided integrated into the housings (110, 120). For example, the first link part (215) and the second link part (223) may be integrated into the first housing (110). The third link portion (216) and the fourth link portion (224) can be integrated into the second housing (120).

[0053] The fixed bracket (213) may include at least a portion of a shape of a lower surface (e.g., a surface in the -z-axis direction) that is curved. For example, at least a portion of the lower surface of the fixed bracket (213) may be formed to correspond to the inner shape of the hinge housing (150). The fixed bracket (213) may include a fixed bracket body (213a3) in which at least a portion of an upper surface (e.g., a surface in the z-axis direction) is provided in a flat shape, fixed rail grooves (213a1, 213a2) formed on one side of the fixed bracket body (213a3) to which the rotating members (211, 212) are coupled, and a bracket extension portion (213a4) arranged to cover at least a portion of the gears (e.g., 233a, 233b, 234a, 234b) and to cover at least a portion of the first arm member (221) and the second arm member (222). According to one embodiment, the fixed bracket (213) may include at least a portion of a cross-section that has an arc shape in the direction from the upper surface (e.g., the surface in the z-axis direction) to the lower surface (e.g., the surface in the -z-axis direction). A part of the first rotation member (211) (e.g., at least a part of the first rail structure (211_1) among the first rail structure (211_1) and the second rail structure (211_2) constituting the first rotation member (211)) may be inserted from a first direction (e.g., the -x-axis direction) to a second direction (e.g., the x-axis direction) into the first fixed rail groove (213a1) formed in the fixed bracket body (213a3). In the second fixed rail groove (213a2), a part of the second rotation member (212) (e.g., at least a part of the third rail structure (212_1) among the third rail structure (212_1) and the fourth rail structure (212_2) constituting the second rotation member (212)) can be inserted from the second direction (e.g., the x-axis direction) to the first direction (e.g., the -x-axis direction).With respect to the first axis (11) or the second axis (12) (or with respect to any axis crossing the center between the first rotation member (211) and the second rotation member (212), the first fixed rail groove (213a1) may be formed to be offset in the -x-axis direction compared to the second fixed rail groove (213a2), and the second fixed rail groove (213a2) may be formed to be offset in the x-axis direction compared to the first fixed rail groove (213a1). The first rail structure (211_1) of the first rotation member (211), at least a portion of which is inserted into the first fixed rail groove (213a1), rotates with respect to the first axis (11), and the third rail structure (212_1) of the second rotation member (212), at least a portion of which is inserted into the second fixed rail groove (213a2), rotates with respect to the second axis (12). The first axis (11) and the second axis (12) may be formed above (air) the upper surface (e.g., the surface in the z-axis direction) of the fixed bracket (213). Alternatively, the first axis (11) and the second axis (12) may be formed between the upper surface of the display (160) and the lower surface (e.g., the surface in the -z-axis direction) of the upper fixed bracket (213b).

[0054] According to one embodiment, the first axis (11) and the second axis (12) may be formed to be spaced apart by a specified interval. According to various embodiments, the interval between the first axis (11) and the second axis (12) may be formed smaller than the interval between the first shaft (231) and the second shaft (232) (or the interval between the third axis (13) formed at the center of the first shaft (231) and the fourth axis (14) formed at the center of the second shaft (232). According to various embodiments, the first axis (11) and the second axis (12) may be formed higher than the first shaft (231) and the second shaft (232) based on the z-axis. Alternatively, the first axis (11) and the second axis (12) may be formed closer to the upper surface of the display (160) than the first shaft (231) and the second shaft (232) based on the z-axis. According to various embodiments, the fixed bracket body (213a3) may include at least one fixing hole used to fix the fixed bracket (213) to the hinge housing (150). The fixed bracket body (213a3) may be fixed to the hinge housing (150) through at least one connecting member. As an example, the foldable electronic device (100) may fix the fixed bracket (213) to the hinge housing (150) using a connecting member (e.g., screw, rivet, welding).

[0055] The first rotation member (211) may include a first rotation body (211_3), a first rail structure (211_1), and a second rail structure (211_2). The first rotation body (211_3) may be disposed between the first rail structure (211_1) and the second rail structure (211_2) in the form of a rail. For example, the first rail structure (211_1) and the second rail structure (211_2) may be formed flat or stepped with the first rotation body (211_3) as the center. The first rail structure (211_1) of the first rotation member (211) may be fastened to one side of a fixed bracket (213) (e.g., the first fixed rail groove (213a1)) so as to enable a hinge movement. The second rail structure (211_2) of the first rotation member (211) can be coupled to one side of the first link portion (215) to perform a sliding motion (or a rotating motion, or an arcing motion) in response to the hinge motion (or a rotating motion, or a sliding motion) of the first rail structure (211_1). The first rotation member (211) can be separated from or not fixed to the first link portion (215) so as to perform a sliding motion (or a rotating motion) with respect to the first link portion (215). In this process, a gap may be formed between the first rotation member (211) and the first link portion (215), and the rotating motion of the first rotation member (211) may become irregular due to the gap, or a specific portion of the rotating motion may be subjected to greater pressure than other portions. In this regard, the embodiment of the present disclosure can provide a structure in which the fastening structure of the first rotating member (211) and the first link portion (215) is such that the protrusions and grooves of the rail are interlocked with each other.Additionally or alternatively, the embodiment of the present disclosure may provide a link cover (or link cover structure) that can press or compress at least a portion of the first rotation member (211) fastened to the first link portion (215), thereby reducing a gap between the first rotation member (211) and the first link portion (215) (or a gap between a rail protrusion of the first rotation member (211) and a rail groove of the first link portion (215)) or helping to maintain a constant gap between the first rotation member (211) and the first link portion (215). This improved form of the present disclosure may be equally applied to the second rotation member (212) and the third link portion (216).

[0056] While the first link portion (215) coupled to the first housing (110) moves in accordance with the movement of the first housing (110), the first rail structure (211_1) of the first rotational member (211) connected to the fixed bracket (213) can rotate in place with respect to the first axis (11). For example, the second rail structure (211_2) of the first rotational member (211) can rotate (or slide) at a certain angle within the first link portion (215) (or by using the first link portion (215)) while moving in one direction (e.g., counterclockwise while the foldable electronic device (100) is folded from an unfolded state or clockwise while the foldable electronic device (100) is unfolded from a folded state). At least a part of the first wing plate (131) among the wing plates (131, 132) can be fixed to the first rotational member (211). In this regard, the first rotating body (211_3) may include at least one hole or groove used for coupling with the first wing plate (131). The first rail structure (211_1) inserted into the first fixed rail groove may include two symmetrical curved rails. The second rail structure (211_2) coupled to the first link portion (215) may include curved rails that are not symmetrical or have different shapes.

[0057] According to one embodiment, the second rotation member (212) may include a part (e.g., a third rail structure (212_1)) that is fastened to the other side of the fixed bracket (213) (e.g., a second fixed rail groove (213a2)) so as to enable a hinge movement, and a part (e.g., a fourth rail structure (212_2)) that is coupled to the third link part (216), and a second rotation body (212_3) that is disposed between the third rail structure (212_1) and the fourth rail structure (212_2). At least a portion of the upper surface of the third rail structure (212_1) and the fourth rail structure (212_2) may be formed flat or stepped with respect to the second rotation body (212_3). While the third link portion (216) coupled to the second housing (120) moves in accordance with the movement of the second housing (120), the third rail structure (212_1) of the second rotation member (212) coupled to the fixed bracket (213) can rotate in place with respect to the second axis (12). The fourth rail structure (212_2) at least partially coupled to the third link portion (216) can rotate (or slide) at a certain angle within the third link portion (216) (or by using the third link portion (216)) while moving in one direction (e.g., counterclockwise while the foldable electronic device (100) is folded from an unfolded state or clockwise while the foldable electronic device (100) is unfolded from a folded state). The third rail structure (212_1) may include a rail structure similar to or identical to the first rail structure (211_1). The fourth rail structure (212_2) coupled to the third link portion (216) can rotate (or slide) at a certain angle within the third link portion (216) (or using the third link portion (216)) while moving in one direction (e.g., counterclockwise while the foldable electronic device (100) is folded from an unfolded state or clockwise while the foldable electronic device (100) is unfolded from a folded state).In this regard, the third link portion (216) may include a rail projection (or rail wing) and a rail groove having a hollow space formed in the center and curved surfaces arranged on both sides, similar to the first link portion (215).

[0058] The second rotation member (212) may experience friction with the fixed bracket (213) and the third link portion (216) while the hinge motion is repeated similarly to the first rotation member (211), and may be formed of a material (e.g., a metal material) having a certain strength or higher that can withstand this. For example, the second rotation member (212) may be formed of the same material as the first rotation member (211). A portion of the second wing plate (132) among the wing plates (131, 132) may be fixed to the second rotation member (212). In this regard, the second rotation body (212_3) may include at least one hole or groove used for coupling with the second wing plate (132). The second rotation member (212) may move in a direction opposite to that of the first rotation member (211). For example, while the first rail structure (211_1) of the first rotation member (211) rotates in place in a counterclockwise direction, the third rail structure (212_1) of the second rotation member (212) can rotate in place in a clockwise direction. The fourth rail structure (212_2) may have the same or similar structure as the second rail structure (211_2) described above. As an example, the third rail structure (212_1) may have the same structure (or pattern) (e.g., rails or rail protrusions) arranged on both sides. The fourth rail structure (212_2) may include different structures (e.g., a rail protrusion formed on one side and a rail groove formed on the other side) on both sides.

[0059] While the foldable electronic device (100) is folded, the first rail structure (211_1) of the first rotating member (211) rotates counterclockwise, and the first link portion (215) inserted into the second rail structure (211_2) can slide clockwise along the second rail structure (211_2) (since the sliding motion is relative, the first link portion (215) slides clockwise with respect to the second rail structure (211_2)). While the foldable electronic device (100) is folded, the third rail structure (212_1) of the second rotating member (212) can rotate clockwise along the second fixed rail groove (213a2) of the fixed bracket (213), and the third link portion (216) inserted into the fourth rail structure (212_2) can slide counterclockwise (since the sliding motion is relative, the third link portion (216) can slide clockwise with respect to the fourth rail structure (212_2)).

[0060] According to one embodiment, the first link portion (215) may include a structure that is coupled and fixed to one side of the first housing (110). The first link portion (215) may include at least an eleventh link side wall (215_1) (or a first side wall of the first link portion (215)) and a twelfth link side wall (215_2) (or a second side wall of the first link portion (215). The first link portion (215) may include a structure (e.g., the eleventh link side wall (215_1) and the twelfth link side wall (215_2)) on which a part of the first rotation member (211) (e.g., the second rail structure (211_2)) is arranged (or fastened, coupled). The 11th link side wall (215_1) may be formed with a rail protrusion (or rail groove) protruding toward the 12th link side wall (215_2), and the 12th link side wall (215_2) may be formed with a rail groove (or protruding rail protrusion) protruding toward the 11th link side wall (215_1). The rail groove and the rail protrusion may be fastened to the second rail structure (211_2). In response to the fact that the shapes of the structures formed in the first link portion (215) are formed opposite to each other, the shapes of the structures formed in the second rail structure (211_2) coupled to the first link portion (215) may be formed opposite to each other.

[0061] According to one embodiment, the second link portion (223) may include a structure in which a portion of the first arm member (221) is arranged (or fastened, coupled, or secured). The second link portion (223) may include at least a twenty-first link side wall (223_1) and a twenty-second link side wall (223_2). A rail protrusion (or rail groove) protruding toward the twenty-second link side wall (223_2) may be formed on the twenty-first link side wall (223_1), and a rail groove (or protruding rail protrusion) formed toward the twenty-first link side wall (223_1) may be arranged on the twenty-second link side wall (223_2). The rail groove and the rail protrusion may be fastened to one side of the first arm member (221). A structure (e.g., at least one hole or groove) used to secure the second link portion (223) to the first housing (110) may be formed on the 21st link side wall (223_1) and the 22nd link side wall (223_2). An empty space is formed between the 21st link side wall (223_1) and the 22nd link side wall (223_2), and a part of the first arm member (221) may be seated in the empty space to guide the sliding motion of the first arm member (221).

[0062] According to one embodiment, the third link portion (216) may include a structure that is coupled and fixed to one side of the second housing (120). The third link portion (216) may include at least a 31st link side wall (216_1) and a 32nd link side wall (216_2). The third link portion (216) may include a structure (e.g., the 31st link side wall (216_1) and the 32nd link side wall (216_2)) on which a part of the second rotation member (212) (e.g., the 4th rail structure (212_2)) is arranged (or fastened, coupled, or settled). The 31st link side wall (216_1) may be formed with a rail protrusion (or rail groove) protruding in the direction of the 32nd link side wall (216_2), and the 32nd link side wall (216_2) may be formed with a rail groove (or protruding rail protrusion) protruding in the direction of the 31st link side wall (216_1). The rail groove and the rail protrusion may be fastened to the fourth rail structure (212_2). In this regard, the protrusion structure formed in the fourth rail structure (212_2) may be provided in a left-right asymmetrical shape so as to be inserted into the rail groove and the rail protrusion. The third link portion (216) described above may be arranged symmetrically with respect to the first link portion (215) in the y-axis direction. The third link portion (216) may be arranged parallel to the fourth link portion (224) in the y-axis direction.

[0063] According to one embodiment, the fourth link portion (224) may include a structure in which a portion of the second arm member (222) is arranged (or fastened, coupled, or seated). In this regard, the fourth link portion (224) may include at least a 41st link side wall (224_1) and a 42nd link side wall (224_2). A rail protrusion (or rail groove) protruding toward the 42nd link side wall (224_2) may be formed on the 41st link side wall (224_1), and a rail groove (or protruding rail protrusion) formed toward the 41st link side wall (224_1) may be formed on the 42nd link side wall (224_2). The rail groove and the rail protrusion may be fastened to a portion of the second arm member (222). A structure (e.g., at least one hole or groove) used to secure the fourth link portion (224) to the second housing (120) may be formed on the 41st link side wall (224_1) and the 42nd link side wall (224_2). An empty space is formed between the 41st link side wall (224_1) and the 42nd link side wall (224_2), and the empty space may be used to guide the second arm member (222) while one side of the second arm member (222) slides.

[0064] According to one embodiment, the first link member (250_1) may include a first link portion (215), a second link portion (223), a first link connection portion (215c), and a first link cover (217) (or a first cover, a first support portion). The first link connection portion (215c) may connect the first link portion (215) and the second link portion (223). The first link connection portion (215c) may be formed of the same material as at least one of the first link portion (215) and the second link portion (223). One side of the first link cover (217) may be disposed on the first link connection portion (215c) (e.g., on one side in the z-axis direction). The first link cover (217) may be arranged to cover a part of the first link connection portion (215c), a part of the second rail structure (211_2) of the first rotation member (211), and a part of the first arm member (221). In this process, the first link cover (217) may be arranged to press the first rotation member (211) and the first arm member (221) in the -z-axis direction, thereby acting to bring at least a part of the first rotation member (211) and at least a part of the first link portion (215) into a more solid contact state, and acting to bring at least a part of the first arm member (221) into a more solid contact state with at least a part of the second link portion (223).

[0065] According to one embodiment, the second link member (250_2) may include a third link portion (216), a fourth link portion (224), a second link connection portion (216c), and a second link cover (218) (or a second cover, a second support portion). The second link connection portion (216c) may have the same or similar structure and material as the first link connection portion (215c) described above. One side of the second link cover (218) may be disposed on the second link connection portion (216c) (e.g., on one side in the z-axis direction). The second link cover (218) may be disposed to cover a part of the second link connection portion (216c), a part of the fourth rail structure (212_2) of the second rotation member (212), and a part of the second arm member (222). This second link cover (218) can act to bring at least a portion of the second rotating member (212) and at least a portion of the third link portion (216) into a more solid contact state, similar to or identical to the first link cover (217), and can act to bring at least a portion of the second arm member (222) and at least a portion of the fourth link portion (224) into a more solid contact state.

[0066] The first to fourth link portions (215, 223, 216, 224) may be formed of the same or similar material. Alternatively, the first to fourth link portions (215, 223, 216, 224) may be formed at least partially of a different structure or a different material (e.g., an injection-molded material). Meanwhile, in the above description, the form in which the link portions (215, 223, 216, 224) are connected is exemplified, but the present disclosure is not limited thereto. For example, the first link portion (215) and the second link portion (223) may be separated from each other, and the third link portion (216) and the fourth link portion (224) may be separated from each other.

[0067] According to one embodiment, with respect to the folding axis (e.g., an imaginary axis crossing the center between the first axis (11) and the second axis (12), the link rail protrusion and link step (or link wheel, link support) formed on the first link portion (215) may be formed at positions symmetrical to the link rail protrusion and link step formed on the third link portion (216). For example, link rail protrusions may be formed on the eleventh link side wall (215_1) of the first link portion (215) and the thirty-first link side wall (216_1) of the third link portion (216), and link steps may be formed on the twelfth link side wall (215_2) of the first link portion (215) and the thirty-second link side wall (216_2) of the third link portion (216).

[0068] With respect to the folding axis (e.g., an imaginary axis crossing the center between the first axis (11) and the second axis (12), the link rail protrusion and link step formed on the second link portion (223) may be formed at positions symmetrical to the link rail protrusion and link step formed on the fourth link portion (224). For example, link rail protrusions may be formed on the 21st link side wall (223_1) of the second link portion (223) and the 41st link side wall (224_1) of the fourth link portion (224), and link steps may be formed on the 22nd link side wall (223_2) of the second link portion (223) and the 42nd link side wall (224_2) of the fourth link portion (224).

[0069] According to one embodiment, the distance between the link protrusions in the first link portion (215) and the second link portion (223) (or the third link portion (216) and the fourth link portion (224)) connected by the link connection portion may be formed shorter than the distance between the link rail protrusions. Meanwhile, the embodiment of the present disclosure is not limited to the above-described example, and the positions of the link rail protrusions and the positions of the link protrusions may be formed on the side walls at the same position or at different positions on the side walls depending on the link portions.

[0070] According to one embodiment, the positions of the rail protrusion and the rail groove of the first rotating member (211) may be arranged symmetrically with respect to the rail protrusion and the rail groove of the second rotating member (212). The positions of the rail protrusion and the rail groove of the first arm member (221) may be arranged symmetrically with respect to the rail protrusion and the rail groove of the second arm member (222). The distance between the rail protrusion of the first rotating member (211) and the rail protrusion of the first arm member (221) may be formed shorter (or longer) than the distance between the rail groove of the first rotating member (211) and the rail groove of the first arm member (221). Alternatively, in some embodiments, the distance between the rail protrusion of the first rotating member (211) and the rail groove of the first arm member (221) may be arranged to be the same as the distance between the rail groove of the first rotating member (211) and the rail protrusion of the first arm member (221).

[0071] As described above, the second rail structure (211_2) (or the second arm portion (221_2)) (reverse rail structure) having rail protrusions and rail grooves formed on both sides of the first rotating member (211) (or the first arm portion (221)) maintains a more constant contact state with the link step and link rail protrusion formed in the first link portion (215) (or the second link portion (223)) during the hinge operation, so that the gap (or contact state) between the components included in the hinge structure can be constantly maintained. Accordingly, the occurrence of joints or the flow of the hinge structure can be improved.

[0072] According to one embodiment, the first arm member (221) may be arranged symmetrically with the second arm member (222) with respect to the y-axis or the -y-axis. The first arm member (221) may rotate from the z-axis to the -x-axis direction (counterclockwise with respect to the direction from the y-axis toward the -y-axis) or from the -x-axis direction to the z-axis direction (clockwise with respect to the direction from the y-axis toward the -y-axis). A portion of the first arm member (221) may include a first through-hole through which a first shaft (231) may pass, and a first cam structure may be provided in a peripheral structure forming the first through-hole to perform a cam operation by contacting one side of a cam member (241) (e.g., a first fixed cam portion (241a) arranged in the -x-axis direction). The first through hole may have at least a portion that is distorted or a portion of the z-axis cross-section may have a D shape so that the first arm member (221) can rotate according to the rotation of the first shaft (231). A portion of the first arm member (221) may include a hook or a step that is provided so that it can be caught on one side of a stopper (236) (e.g., a stopper portion in an area arranged on the first main gear (233a)) when the foldable electronic device (100) is about to rotate more than a predetermined angle. A portion of the first arm member (221) into which a portion of the first shaft (231) is inserted may be arranged between the stopper (236) and one side of a cam member (241) (e.g., a first fixed cam portion (241a)). Another portion of the first arm member (221) may be fastened to the second link portion (223) so that the foldable electronic device (100) may perform a sliding operation along the rail protrusion and rail groove formed in the second link portion (223) while performing a hinge operation. In this regard, a rail groove corresponding to the rail protrusion of the second link portion (223) and a rail protrusion corresponding to the rail groove of the second link portion (223) may be arranged in another portion of the first arm member (221).According to one embodiment, the first arm member (221) may be separated from or not fixed to the second link portion (223) so as to perform a sliding motion (or a rotational motion) on the second link portion (223). In this process, a gap may be formed between the first arm member (221) and the second link portion (223), and the rotational motion of the first arm member (221) may become irregular due to the gap, or a specific portion of the rotational motion may be subjected to greater pressure than other portions. In this regard, the embodiment of the present disclosure may provide a structure in which the projections and grooves of the rails are interlocked with each other in the fastening structure of the first arm member (221) and the second link portion (223). Additionally or alternatively, the embodiment of the present disclosure may provide a link cover (or link cover structure) that can press or pressurize at least a portion of the first arm member (221) fastened to the second link portion (223), thereby reducing a gap between the first arm member (221) and the second link portion (223) (or a gap between a rail protrusion of the first arm member (221) and a rail groove of the second link portion (223)) or helping to maintain a constant gap between the first arm member (221) and the second link portion (223).

[0073] According to one embodiment, the second arm member (222) may be arranged symmetrically with respect to the first arm member (221) with respect to the y-axis or the -y-axis. The second arm member (222) may rotate from the z-axis to the x-axis direction (e.g., clockwise with respect to the direction from the y-axis toward the -y-axis) or from the x-axis direction to the z-axis direction (e.g., counterclockwise with respect to the direction from the y-axis toward the -y-axis). The second arm member (222) may rotate in the opposite direction to the direction of movement of the first arm member (221). A portion of the second arm member (222) may include a second through-hole through which a second shaft (232) may pass, and a second cam structure may be provided in a peripheral structure forming the second through-hole to contact the other side of the cam member (241) (e.g., a second fixed cam portion (241b) arranged in the x-axis direction) to perform a cam operation. The second through hole may have a structure similar to or identical to the first through hole, such that at least a portion of the second arm member (222) may be distorted or a portion of the z-axis cross section may have a D shape so that the second arm member (222) may rotate according to the rotation of the second shaft (232). A portion of the second arm member (222) may include a protruding hook or step so that it may be caught on the other side of the stopper (236) (e.g., a stopper portion in an area arranged on the second main gear (233b)). When external pressure is applied at an angle greater than the angle at which the foldable electronic device (100) unfolds (e.g., an angle exceeding 180 degrees), the step of a portion of the second arm member (222) may be supported by the stopper (236) so that the foldable electronic device (100) does not fold beyond a specified angle. A portion of the second arm member (222), into which a portion of the second shaft (232) is inserted, may be placed between the stopper (236) and the other side of the cam member (241) (e.g., the second fixed cam portion (241b)).Another portion of the second arm member (222) may be fastened to the fourth link portion (224) so ​​as to perform a sliding motion along the rail protrusion and rail groove formed in the fourth link portion (224) while the foldable electronic device (100) performs a hinge motion. In this regard, another portion of the second arm member (222) may include a rail groove fastened to the rail protrusion of the fourth link portion (224) and a rail protrusion (or rail wing) fastened to the rail groove of the fourth link portion (224).

[0074] According to one embodiment, the first shaft (231) may have a rod shape in which the length in the y-axis or -y-axis direction is longer than the length in the x-axis or z-axis direction. The first shaft (231) may be formed of a metal material so as to support inserted components. A first main gear (233a) may be coupled or formed (e.g., integrated with the first main gear (233a)) at one end of the first shaft (231). The z-axis cross-section of one point of the first shaft (231) may include a flat area and a curved surface. As an example, the upper surface and the lower surface of the z-axis cross-section of at least one point of the first shaft (231) may be formed to be flat, respectively, and both sides may include curved surfaces. Alternatively, the z-axis cross-section of the first shaft (231) may have a polygonal shape (e.g., a triangle, a square, a pentagon, or a hexagon). Accordingly, a structure having a cylindrical shape of a through hole can maintain its current state without rotating while the first shaft (231) rotates, and when the through hole is a structure having an angular shape similar to that of the first shaft (231), it can rotate together while the first shaft (231) rotates. For example, a part of the first arm member (221), a first fixed cam part (241a) of the cam member (241), at least one washer ring (e.g., a first washer ring (249a)), a first elastic member (242a), a part of a shaft fixing part (243), a first coupling means (249e1) (e.g., a first E-ring) (or a first fastening member, a first fastening means)) can be inserted (or coupled) into the first shaft (231).

[0075] According to one embodiment, the second shaft (232) may have the same or similar shape as the first shaft (231). For example, the second shaft (232) may have a rod shape in which the length in the y-axis or -y-axis direction is longer than the length in the x-axis or z-axis direction. The second shaft (232) may be formed of a metal material having a strength greater than a specified size so as to support the inserted components. A second main gear (233b) may be coupled or formed (e.g., integrated with the second main gear (233b)) at one end of the second shaft (232). As an example, the upper and lower surfaces of the z-axis cross-section of the second shaft (232) may be formed flat, and both sides may include curved surfaces. Alternatively, the z-axis cross-section of the second shaft (232) may have a polygonal shape. Accordingly, a structure having a cylindrical shape of a through hole can maintain its current state without rotating while the second shaft (232) rotates, and if the through hole is a structure having an angular shape similar to that of the second shaft (232), it can rotate together while the second shaft (232) rotates. For example, a part of the second arm member (222), a second fixed cam part (241b) of the cam member (241), at least one washer ring (e.g., a second washer ring (249b)), a second elastic member (242b), another part of the shaft fixing part (243), a second coupling means (249e2) (e.g., a second E-ring) (or a second fastening member, a second fastening means) can be inserted (or coupled) into the second shaft (232).

[0076] FIG. 5 is a drawing showing an example of a configuration of a first link member, a first arm member, and a first rotation member according to one embodiment. FIG. 6 is a drawing showing an example of a first link member according to one embodiment. FIG. 7 is a drawing showing an example of a first arrangement state of a first rotation member according to one embodiment. FIG. 8 is a drawing showing an example of a second arrangement state of a first rotation member according to one embodiment. FIG. 9 is a drawing showing an example of a first arrangement state of a first arm member according to one embodiment. FIG. 10 is a drawing showing an example of a second arrangement state of a first arm member according to one embodiment. FIG. 11 is a drawing showing an example of a first link cover configuration according to one embodiment.

[0077] At least some of the structures illustrated in FIGS. 5 to 11 illustrate examples of some configurations of the first type hinge structure described above (e.g., the first type hinge structure (201) described in FIG. 3). As an example, the first link member illustrated in FIG. 5 may be the first link member (250_1) described above, and the first arm member and the first rotation member illustrated in FIG. 5 may be the first arm member (221) and the first rotation member (211) described above. In the following description, the gap change of the structures during the rotational operation of the first type hinge structure (201) is improved based on the first link member (250_1), the first arm member (221), and the first rotation member (211), thereby improving the occurrence of joint noise or discomfort will be described. However, the present invention is not limited thereto, and the description of the first link member (250_1), the first arm member (221), and the first rotation member (211) described above can be equally applied to the second link member (250_2), the second arm member (222), and the second rotation member (212), and can be equally applied to other hinge structures (e.g., the second hinge structure (200b) of FIG. 2). Alternatively, the structure for improving gap change of the present document may be applied to only one hinge structure among a plurality of hinge structures included in the foldable electronic device (100).

[0078] Referring to FIGS. 1 to 5 and 6, a portion of a first type hinge structure (201) according to one embodiment may include a first link member (250_1) to which a first rotation member (211) and a portion of a first arm member (221) are connected.

[0079] The first link member (250_1) may include a first link portion (215) (or first link portion), a second link portion (223) (or second link portion), a first link connection portion (215c) (or first connection portion), a first link cover structure (217assy) (or first link cover assembly, first link cover assembly) (e.g., first link cover (217), first connection member (217_scr), first link elastic member (217_el)). Here, the expressions “first” or “second” given to the components of the first link member (250_1) are given for connection with the first link portion (215) and the second link portion (223) described above in FIGS. 3 and 4, and the corresponding numbering may be different.

[0080] The first link portion (215) comprises a first link body (215_3) (or first body), an eleventh link side wall (215_1) (or the first link side wall of the first link portion (215), the first side wall of the first link portion (215), or the first side wall), a twelfth link side wall (215_2) (or the second link side wall of the first link portion (215), the second side wall of the first link portion (215), or the second side wall), a first link fixing portion (215_4) (or the first fixing portion), a first link rail protrusion (215_1r) (or the first link rail, the first link rail structure, the link rail protrusion of the first link portion (215), the first protrusion), and a first link step (215_2r) (or the first link supporting portion or the first link protrusion portion, the link step of the first link portion (215), the first (can include a single chin).

[0081] The first link body (215_3) may include a structure in which the thickness of the z-axis is formed thinner than the thickness of the y-axis or the x-axis. The first link body (215_3) may be arranged between the eleventh link side wall (215_1) and the twelfth link side wall (215_2). The first link body (215_3) may be arranged to connect one side of the eleventh link side wall (215_1) (e.g., the -z-axis edge of the eleventh link side wall (215_1)) and one side of the twelfth link side wall (215_2) (e.g., the -z-axis edge of the twelfth link side wall (215_2)). When the first rotation member (211) is fastened (or coupled) to the first link portion (215), the upper surface of the first link body (215_3) may be arranged to face the rear surface (e.g., the surface facing the -z-axis) of the second rail structure (211_2) of the first rotation member (211). As an example, a gap of a predetermined size may be formed between the upper surface of the first link body (215_3) and the rear surface of the second rail structure (211_2). At least a portion of the upper surface (e.g., the surface facing the z-axis) of the first link body (215_3) may include a curved surface.

[0082] The above eleventh link side wall (215_1) may include a structure that is connected to one edge of the first link body (215_3) (e.g., the -y-axis edge of the first link body (215_3)) and extends in the direction of the upper surface of the first link body (215_3) (e.g., the z-axis direction). The eleventh link side wall (215_1) may be arranged to face the twelfth link side wall (215_2) with the first link body (215_3) interposed therebetween. The eleventh link side wall (215_1) may be arranged to face, for example, a part of the first rotation member (211) (e.g., one side of the second rail structure (211_2) or a side facing the y-axis of the second rail structure (211_2)). A first link rail protrusion (215_1r) may be formed on a side surface (e.g., a surface facing the y-axis) of the 11th link side wall (215_1) and protruding in a direction toward the 12th link side wall (215_2). The first link rail protrusion (215_1r) may have a predetermined curvature (or inclination) on the side surface of the 11th link side wall (215_1) and may include a protruding band-shaped structure. The protruding shape and length of the first link rail protrusion (215_1r) may have a shape corresponding to the shape of the first rail groove (211_2r1) formed in the second rail structure (211_2) of the first rotating member (211) (e.g., a shape at least partially engaged with the first rail groove (211_2r1). According to one embodiment, at least at one point where the foldable electronic device (100) changes from a folded state to an unfolded state or from an unfolded state to a folded state, at least a portion of an upper surface (e.g., a surface facing the z-axis) of the first link rail protrusion (215_1r) may be in a state of facing or in contact with one surface (e.g., a surface arranged to face the -z-axis) of the first rail groove (211_2r1).

[0083] The 12th link side wall (215_2) may include a structure that is connected to the other edge of the first link body (215_3) (e.g., the y-axis edge of the first link body (215_3)) and extends in the upper surface direction (e.g., the z-axis direction) of the first link body (215_3). The 12th link side wall (215_2) may be arranged to face the 11th link side wall (215_1) with the first link body (215_3) interposed therebetween. The 12th link side wall (215_2) may be arranged to face, for example, another part of the first rotation member (211) (e.g., the other side of the second rail structure (211_2) or the side facing the y-axis of the second rail structure (211_2)). A first link step (215_2r) may be formed on a side surface (e.g., a surface facing the -y axis) of the 12th link side wall (215_2) in a direction facing the 11th link side wall (215_1). The first link step (215_2r) may be formed as a curved surface having a predetermined curvature on an upper surface facing the z axis. The width of the first link step (215_2r) may be formed to be, for example, the same as or similar to (or smaller or larger, depending on the design method) the width of the protrusion of the first rail protrusion (211_2r2) (or the first rail) formed on the other side surface of the second rail structure (211_2) of the first rotation member (211). The upper surface (e.g., the surface facing the z-axis) of the first link step (215_2r) may be arranged to contact or face the inner surface (e.g., the surface observed when facing the z-axis direction from the -z-axis) of the first rail protrusion (211_2r2).

[0084] The first link fixing portion (215_4) may include a structure extending in the -y-axis direction from one side (e.g., the side facing the -y-axis) of the eleventh link side wall (215_1). The first link fixing portion (215_4) may include a structure extending in a direction away from the eleventh link side wall (215_1) from an upper side (z-axis edge) of the eleventh link side wall (215_1). At least a portion of the first link fixing portion (215_4) may be formed such that the lengths of the x-axis and y-axis are greater than the thickness in the z-axis direction, and the center (or a portion) of the xy-plane (or the side facing the z-axis) of the first link fixing portion (215_4) may include a through hole (e.g., a hole penetrating in the -z-axis direction from the z-axis) used to couple the first link member (250_1) to a housing (e.g., the first housing (110) of FIG. 2). Additionally, the first link fixing member (215_4) may include a side wall extending in the -z-axis direction to support the first link fixing member (215_4).

[0085] The second link portion (223) may include a second link body (223_3) (or a link body or a second body of the second link portion (223)), a twenty-first link side wall (223_1) (or a first side wall, a third side wall of the second link portion (223), a twenty-second link side wall (223_2) (or a second side wall, a fourth side wall of the second link portion (223), a second link fixing portion (223_4) (or a fixing portion, a second fixing portion of the second link portion (223), a second link rail protrusion (223_1r) (or a second link rail, a second link rail structure, a link rail protrusion of the second link portion (223), a second protrusion), and a second link step (223_2r) (or a second link support portion or a second link protrusion portion, a link step of the second link portion (223), a second step). In order for the link cover (217) included in the link cover structure (217assy) to be positioned on the link connection portion (215c) to press the first rotation member (211) and the first arm member (221), a link step (215_2r) may be formed on the 12th link side wall (215_2) in the first link portion (215), and a link step (223_2r) may be formed on the 22nd link side wall (223_2) (or, the side wall connected to the link connection portion (215c)) in the second link portion (223).

[0086] The second link body (223_3) may include a structure in which the thickness of the z-axis is formed thinner than the thickness of the y-axis or the x-axis. For example, the second link body (223_3) may be formed parallel to the first link body (215_3). Alternatively, the second link body (223_3) may be positioned at a position in which the height of the z-axis is different from that of the first link body (215_3). The second link body (223_3) may be positioned between the 21st link side wall (223_1) and the 22nd link side wall (223_2). The second link body (223_3) may be arranged to connect one side of the 21st link side wall (223_1) (e.g., the -z-axis edge of the 21st link side wall (223_1)) and one side of the 22nd link side wall (223_2) (e.g., the -z-axis edge of the 22nd link side wall (223_2)). When the first arm member (221) is fastened (or coupled) to the first link member (250_1), the upper surface of the second link body (223_3) may be arranged to face the rear surface (e.g., the surface facing the -z-axis) of the second arm portion (221_2) of the first arm member (221). As an example, a gap of a predetermined size may be formed between the upper surface of the second link body (223_3) and the rear surface of the second arm portion (221_2). At least a portion of the upper surface of the second link body (223_3) may form a curved surface.

[0087] The 21st link side wall (223_1) may include a structure that is connected to one edge of the second link body (223_3) (e.g., the y-axis edge of the second link body (223_3)) and extends in the direction of the upper surface of the second link body (223_3) (e.g., the z-axis direction). The 21st link side wall (223_1) may be arranged to face the 22nd link side wall (223_2) with the second link body (223_3) interposed therebetween. The 21st link side wall (223_1) may be arranged to face, for example, a part of the first arm member (221) (e.g., one side of the second arm portion (221_2) or a side of the second arm portion (221_2) facing the y-axis). A second link rail protrusion (223_1r) may be formed on a side surface (e.g., a surface facing the -y axis) of the 21st link side wall (223_1) and protruding in a direction toward the 22nd link side wall (223_2). The second link rail protrusion (223_1r) may have a predetermined length on the side surface of the 21st link side wall (223_1) and may include a protruding band-shaped structure. The protruding shape and length of the second link rail protrusion (223_1r) may have a shape corresponding to the shape of the second rail groove (221_2r1) formed in the second arm portion (221_2) of the first arm member (221) (e.g., a shape at least partially engaged with the second rail groove (221_2r1). According to one embodiment, at at least one point where the foldable electronic device (100) changes from a folded state to an unfolded state or from an unfolded state to a folded state, an upper surface (e.g., a surface facing the z-axis) of the second link rail protrusion (223_1r) may be in a facing state or a contact state with one surface (e.g., a surface arranged to face the -z-axis) of the second rail groove (221_2r1). The second link rail protrusion (223_1r) may have a longer length than the first link rail protrusion (215_1r) described above. Alternatively, the degree of bending of the second link rail protrusion (223_1r) may be formed to be smaller (more gentle) than the degree of bending of the first link rail protrusion (215_1r) described above.The size of the curvature of the first link rail protrusion (215_1r) can be formed to be larger than the size of the curvature of the second link rail protrusion (223_1r).

[0088] The 22nd link side wall (223_2) may include a structure that is connected to the other edge of the second link body (223_3) (e.g., the -y-axis edge of the second link body (223_3)) and extends in the upper surface direction (e.g., the z-axis direction) of the second link body (223_3). The 22nd link side wall (223_2) may be arranged to face the 21st link side wall (223_1) with the second link body (223_3) interposed therebetween. The 22nd link side wall (223_2) may be arranged to face, for example, another part of the first arm member (221) (e.g., the other side of the second arm portion (221_2) or the side facing the -y-axis of the second arm portion (221_2)). A second link step (223_2r) may be formed on a side surface (e.g., a surface facing the y-axis) of the 22nd link side wall (223_2) and formed in a direction facing the 21st link side wall (223_1). The width (e.g., y-axis thickness) of the second link step (223_2r) may be formed to be, for example, the same as or similar to (or smaller or larger, depending on the design method) the width of the second rail protrusion (221_2r2) formed on the other side surface of the second arm portion (221_2) of the first arm member (221). The upper surface (e.g., a surface facing the z-axis) of the second link step (223_2r) may be arranged to contact or face the inner surface (e.g., a surface observed when facing the z-axis direction from the -z-axis) of the second rail protrusion (221_2r2). The length of the second link step (223_2r) (e.g., the length formed in the -x-axis direction from the x-axis) may be the same as or similar to the length of the second rail protrusion (221_2r2). The curvature size of the upper surface (e.g., the surface facing the z-axis) of the second link step (223_2r) may be formed to be smaller (gentle) than the curvature size of the upper surface (e.g., the surface facing the z-axis) of the first link step (215_2r) described above. Alternatively, the curvature size of the second link step (223_2r) may be formed to be larger than the curvature size of the first link step (215_2r).According to one embodiment, the length of the upper surface of the second link step (223_2r) may be formed to be longer than the length of the upper surface of the first link step (215_2r).

[0089] The second link fixing portion (223_4) may include a structure extending in the y-axis direction from one side (e.g., the side facing the y-axis) of the 21st link side wall (223_1). The second link fixing portion (223_4) may include a structure extending in a direction away from the 21st link side wall (223_1) from an upper side (z-axis edge) of the 21st link side wall (223_1). The second link fixing portion (223_4) may include a structure identical to or similar to the first link fixing portion (215_4) described above. For example, at least a portion of the second link fixing portion (223_4) may be formed such that the lengths of the x-axis and y-axis are greater than the thickness in the z-axis direction, and the center (or a portion) of the xy plane (or the surface facing the z-axis) of the second link fixing portion (223_4) may include a through hole (e.g., a hole penetrating in the -z-axis direction from the z-axis) used to couple the first link member (250_1) to a housing (e.g., the first housing (110) of FIG. 2). Additionally, the second link fixing portion (223_4) may include a side wall that extends in the -z-axis direction to support the second link fixing portion (223_4). The link fixing portions formed in the third link portion (216) and the fourth link portion (224) may be used to fix (or couple) the second link member (250_2) to a housing (e.g., the second housing (120) of FIG. 2).

[0090] The first link connecting portion (215c) may be disposed between the first link portion (215) (or the 12th link side wall (215_2) of the first link portion (215)) and the second link portion (223) (or the 22nd link side wall (223_2) of the second link portion (223). The first link connecting portion (215c) may include a first connecting portion (215_c1) (or the first connecting portion or first portion of the first link connecting portion (215c)) in which the first link cover structure (217assy) is disposed, and a second connecting portion (215_c2) (or the second connecting portion or second portion of the first link connecting portion (215c)) connected to the first connecting portion (215_c1). The second connecting portion (215_c2) may have a step with the first connecting portion (215_c1) or may be disposed on the same surface. The second connecting portion (215_c2) may include a through hole that penetrates from the z-axis to the -z-axis direction and is used to fix the first link connecting portion (215c) to a housing (e.g., the first housing (110) of FIG. 2). The first connecting portion (215_c1) may include an upper surface (e.g., a surface in the z-axis direction) on which the first link cover (217) of the first link cover structure (217assy) can be seated (or disposed). The edge portion of the upper surface of the first connecting portion (215_c1) includes at least a portion that is inclined, and the central portion of the upper surface of the first connecting portion (215_c1) includes a sunken structure, and a cover coupling hole (or fastening hole) penetrating from the z-axis to the -z-axis may be arranged at the center of the sunken structure. At least a part of the first link cover structure (217assy) may be arranged in the cover coupling hole. A first coupling member (217_scr) and a first link elastic member (217_el) of the first link cover structure (217assy) may be arranged on a lower surface (e.g., a surface facing the -z-axis direction) of the first connecting portion (215_c1).

[0091] The above first link cover structure (217assy) may include a first link cover (217) disposed on the upper side of the first link connecting portion (215c) (e.g., the first connecting portion (215_c1)), a first connecting member (217_scr) disposed on the lower side of the first link connecting portion (215c), and a first link elastic member (217_el). The central portion of the first link cover (217) may be placed on the upper portion of the first connecting portion (215_c1), and a portion (e.g., an edge in the -y-axis direction) of the first link cover (217) may be arranged to cover one side of the first rotation member (211) (e.g., an upper surface (e.g., a surface facing the z-axis) of the first rail protrusion (211_2r2), and another portion (e.g., an edge in the y-axis direction) of the first link cover (217) may be arranged to cover one side of the first arm member (221) (e.g., an upper surface (e.g., a surface facing the z-axis) of the second rail protrusion (221_2r2). The first coupling member (217_scr) may be coupled with the first link cover (217) so that the first link cover (217) may provide a constant pressure in the -z-axis direction. For example, when the first connecting member (217_scr) is connected to the first link cover (217) in a screw type (e.g., a type including a head and a protruding portion protruding from the head and having a screw pattern formed thereon) (or a rivet type), the first link cover (217) can provide pressure to press one side of the first rotating member (211) and one side of the first arm member (221). The first link elastic member (217_el) can be arranged between the first connecting member (217_scr) and the lower surface of the first link connecting portion (215c) to provide elasticity to the first link cover (217).The first link cover (217) coupled with the first connecting member (217_scr) can be placed in a state of contact pressed by elasticity with one side structure (at least a part of the upper surface of the first connecting portion (215_c1), one side of the first rotating member (211) (e.g., the upper surface of the first rail protrusion (211_2r2)), one side of the first arm member (221) (e.g., the upper surface of the second rail protrusion (221_2r2))) based on the elasticity of the first link elastic member (217_el). The first link cover (217) presses a part of the first type hinge structure (201) based on the elasticity of the first link elastic member (217_el) (e.g., one side of the first rotation member (211) (e.g., the upper surface of the first rail protrusion (211_2r2)), one side of the first arm member (221) (e.g., the upper surface of the second rail protrusion (221_2r2))), thereby maintaining a state in which a part of the link rail protrusion or link step formed on the first link member (250_1) (or the first link portion (215) and the second link portion (223)) and a part of the rail protrusion or rail groove formed on the first rotation member (211) or the first arm member (221) are in contact, thereby closing the gap between the first rotation member (211) and the first link portion (215) or the gap between the first arm member (221) and the second link By reducing or improving the change in the gap between the parts (223), the flow during the hinge operation of the foldable electronic device (100) can be improved.

[0092] According to one embodiment, the second link member (250_2) includes a second link connection portion (216c) having a structure identical or similar to that of the first link member (250_1) described above, and the second link connection portion (216c) may include a third connection portion and a fourth connection portion. The third connection portion and the fourth connection portion may have structures identical or similar to those of the first connection portion (215_c1) and the second connection portion (215_c2) described above. A second link cover structure identical or similar to the first link cover structure (217assy) may be arranged on the second link connection portion (216c) of the second link member (250_2). The second link cover structure may include a second link cover (218) corresponding to the first link cover (217) of the first link cover structure (217assy), a second coupling member corresponding to the first coupling member (217_scr), and a second link elastic member corresponding to the first link elastic member (217_el). As an example, a part (e.g., one edge) of the second link cover (218) included in the second link cover structure may be arranged to cover at least a part of a third rail protrusion (e.g., a configuration corresponding to the first rail protrusion (211_2r2) of the first rotation member (211)) of the second rotation member (212), and another part (e.g., the other edge) of the second link cover (218) may be arranged to cover at least a part of a fourth rail protrusion (e.g., a configuration corresponding to the second rail protrusion (221_2r2) of the first arm member (221)) of the second arm member (222).

[0093] According to one embodiment, the third link portion (216) positioned symmetrically with respect to the folding axis (or the first axis (11) or the second axis (12)) along which the foldable electronic device (100) is folded may include a structure identical to or similar to the first link portion (215). For example, the third link portion (216) may include a third link body corresponding to the first link body (215_3), a 31st link side wall (216_1) (or a first side wall of the third link portion (216)), a 32nd link side wall (216_2) (or a second side wall of the third link portion (216)), a third link fixing portion (or a third fixing portion), a third link rail protrusion (or a third link rail, a third link rail structure, a link rail protrusion of the third link portion (216)), and a third link step (or a third link support portion or a third link protrusion portion, a link step of the third link portion (216)), and each of the above-described structures may be formed identically or similarly to the structures of each configuration of the first link portion (215).

[0094] According to one embodiment, the fourth link portion (224) positioned symmetrically with respect to the folding axis (or the first axis (11) or the second axis (12)) along which the foldable electronic device (100) is folded may include a structure identical to or similar to that of the second link portion (223). For example, the fourth link portion (224) may include a fourth link body, a forty-first link side wall (224_1) (or a first side wall of the fourth link portion (224)), a forty-second link side wall (224_2) (or a fourth side wall of the fourth link portion (224)), a fourth link fixing portion (or a fourth fixing portion), a fourth link rail protrusion (or a fourth link rail, a fourth link rail structure, a link rail protrusion of the fourth link portion (224)), and a fourth link step (or a fourth link support portion or a fourth link protrusion portion, a link step of the fourth link portion (224)), and each of the above-described structures may be formed identically or similarly to the structures of each configuration of the second link portion (223).

[0095] Referring to FIGS. 5 to 8, the first rotation member (211) may include a first rotation body (211_3), a first rail structure (211_1) extending to one end (e.g., an end in the x-axis direction) of the first rotation body (211_3), and a second rail structure (211_2) extending to the other end (e.g., an end in the -x-axis direction) of the first rotation body (211_3). At least a portion of the first rail structure (211_1) may be inserted or coupled into a first fixed rail groove of a fixed bracket (213). The second rail structure (211_2) may be coupled to a first link portion (215). The first rotation member (211) may rotate about a first axis (11).

[0096] The first rail structure (211_1) may include a first center portion (211_1cen) (or the first center portion of the first rail structure (211_1)) in which at least a portion of an upper surface (e.g., a surface facing the z-axis) is formed flat. A first rotation rail (211_1r1) (or the first rail) may be arranged on a first side (e.g., a side facing the -y-axis) of the first center portion (211_1cen), and a second rotation rail (211_1r2) (or the second rail) may be arranged on a second side (e.g., a side facing the y-axis) of the first center portion (211_1cen). The first rotation rail (211_1r1) may have a convex shape from the z-axis direction to the -z-axis direction, and may include a crescent structure (or an arc structure) protruding from the first side in the -y-axis direction. The second rotation rail (211_1r2) may have a convex shape in the same direction as the first rotation rail (211_1r1) (e.g., from the z-axis direction to the -z-axis direction, or from the front to the rear direction of the display (160)) and may include a crescent structure (or an arc structure) protruding from the second side in the y-axis direction. The first rotation rail (211_1r1) and the second rotation rail (211_1r2) may be arranged symmetrically based on an imaginary line in the x-axis direction crossing the center. The first rotation rail (211_1r1) and the second rotation rail (211_1r2) may be fastened to a first fixed rail groove of a fixed bracket (213). In this regard, the first fixed rail groove of the fixed bracket (213) may include rail grooves formed in the side wall forming the groove (or grooves) formed in the center of the fixed bracket body (213a3) so as to face the first side and second side directions of the first rotation member (211).

[0097] The second rail structure (211_2) may include a second center portion (211_2up) (or the second center portion of the second rail structure (211_2)) in which at least a portion of an upper surface (e.g., a surface facing the z-axis) is formed flat. A coupling hole (211_2h) formed in the z-axis to -z-axis direction may be formed in the second center portion (211_2up). A protrusion (or boss) formed in the first link member (250_1) may be inserted into the coupling hole (211_2h) so that the second rail structure (211_2) and the first link member (250_1) are more firmly coupled, and after coupling, movement between the structures (e.g., the second rail structure (211_2) and the first link portion (215)) may be prevented. The protrusion (or boss) of the first link member (250_1) may be omitted. For example, the above-described coupling hole (211_2h) can be removed from the second rail structure (211_2). A first rail groove (211_2r1) can be arranged on a first side (211_2sd1) (e.g., a side facing the -y-axis) of the second center (211_2up), and a first rail protrusion (211_2r2) (or a first rail) can be arranged on a second side (211_2sd2) (e.g., a side facing the y-axis) of the second center (211_2up).

[0098] The first rail groove (211_2r1) may be formed on the first side surface (211_2sd1) of the second rail structure (211_2). The first rail groove (211_2r1) may include a groove engraved in the y-axis direction on the surface (or -y-axis) of the first side surface (211_2sd1) of the second rail structure (211_2). The first rail groove (211_2r1) may be fastened to the first link rail protrusion (215_1r) formed on the eleventh link side wall (215_1) of the first link portion (215). In this regard, the shape of the first rail groove (211_2r1) may be formed to be identical or similar to the shape of the first link rail protrusion (215_1r). According to one embodiment, the first rail groove (211_2r1) may have an opposite shape to that of the first rail protrusion (211_2r2). For example, the first rail groove (211_2r1) may have an engraved shape corresponding to the protruding shape of the first rail groove (211_2r1). For example, the first rail groove (211_2r1) may be formed to be convex in the z-axis direction from the -z-axis direction. Alternatively, at least a portion of the first rail groove (211_2r1) may include an arc shape.

[0099] The first rail protrusion (211_2r2) may be formed on the second side surface (211_2sd2) of the second rail structure (211_2). The first rail protrusion (211_2r2) may be formed to protrude in the y-axis direction from the surface of the second side surface (211_2sd2). At least a portion of the first rail protrusion (211_2r2) may be fastened to the first link step (215_2r) formed on the twelfth link side wall (215_2) of the first link portion (215). For example, the convex surface of the first rail protrusion (211_2r2) observed in the -z-axis direction (or the inner surface of the first rail protrusion (211_2r2)) and the convex surface of the first link step (215_2r) may be arranged to face (or contact) each other. The convex surface of the first rail protrusion (211_2r2) observed in the z-axis direction (or the outer surface of the first rail protrusion (211_2r2)) may be arranged to face (or contact) one side of the first link cover (217) (e.g., one portion of the first link cover (217) observed in the -z-axis). In this regard, the first rail protrusion (211_2r2) may have a certain thickness and a convex shape in the z-axis direction from the -z-axis direction, and at least a portion of the first rail protrusion (211_2r2) may include an arc structure protruding in the y-axis direction from the second side surface (211_2sd2). The first rail groove (211_2r1) and the first rail protrusion (211_2r2) may be arranged symmetrically with respect to the y-axis and the -y-axis based on an imaginary line in the x-axis direction crossing the second center (211_2up). The protruding shape of the first rail protrusion (211_2r2) may correspond to the engraved shape of the first rail groove (211_2r1). For example, the curvature of the first rail protrusion (211_2r2) may have a size that is the same as or similar to the curvature of the first rail groove (211_2r1) (similar within a certain error range).

[0100] The first rotation member (211) described above may have the same or similar structure as the second rotation member (212). According to one embodiment, the second rotation member (212) includes a third rail structure (212_1), a fourth rail structure (212_2), and a second rotation body (212_3), and the third rail structure (212_1) of the second rotation member (212) may be similar to the first rail structure (211_1) of the first rotation member (211) and may include a third rotation rail corresponding to the first rotation rail (211_1r1) and a fourth rotation rail corresponding to the second rotation rail (211_1r2) that are disposed at a third center and on both sides of the third center. The fourth rail structure (212_2) of the second rotating member (212) is arranged at the fourth center and both sides of the fourth center, similarly to the second rail structure (211_2) of the first rotating member (211), and may include a second rail groove corresponding to the first rail groove (211_2r1) and a second rail protrusion corresponding to the first rail protrusion (211_2r2). The first rotating member (211) and the second rotating member (212) may be formed as one body, but the present disclosure is not limited thereto. Meanwhile, the arrangement direction of the first rail groove (211_2r1) and the first rail protrusion (211_2r2) (or the second rail groove and the second rail protrusion) may be reversed depending on a change in the structure formed in the first link portion (215) (or the third link portion (216)).

[0101] As described above, since at least a part of one surface of the first rail protrusion (211_2r2) (e.g., the outer surface of the first rail protrusion (211_2r2) or the surface observed in the direction viewed from the z-axis) is maintained in contact with the first link cover (217), the first type hinge structure (201) of the present disclosure and the foldable electronic device (100) including the same can improve the flow of the first rotational member (211) by maintaining a constant gap with the periphery of the first rail protrusion (211_2r2) during the rotation of the first rotational member (211).

[0102] Referring to FIGS. 5 to 10, the first arm member (221) may include a first arm body (221_3), a first arm portion (221_1), and a second arm portion (221_2). The first arm body (221_3) may be disposed between the first arm member (221) and the second arm portion (221_2). The first arm body (221_3) connects the first arm member (221) and the second arm portion (221_2), and may transmit a force that causes the second arm portion (221_2) to slide (or arc) on the second link portion (223) while the foldable electronic device (100) is folded or unfolded to the first arm portion (221_1). Alternatively, the first arm body (221_3) may transmit the rotational force of the first arm portion (221_1) to the second arm portion (221_2) while the first arm portion (221_1) rotates in accordance with the rotation of the first shaft (231). The form of force transmission may be interpreted differently depending on the observed time or point.

[0103] The first arm portion (221_1) may include a first arm hole (221_1h) into which a first shaft (231) can be inserted, and a first cam structure (221_1cam) (or a first cam structure formed on the first arm member (221), or a first rotational cam structure) formed at a peripheral portion forming the first arm hole (221_1h) so as to face a first fixed cam portion (241a) of a cam member (241). The first arm hole (221_1h) may have a diameter similar to that of the first shaft (231) so that the first shaft (231) can be inserted therein. At least a portion of the cross-section in the z-axis direction of the inner side of the first arm hole (221_1h) may be formed to be angled so as to be able to rotate in response to the rotation of the first shaft (231). Alternatively, at least a portion of the z-axis cross-sectional shape of the first arm hole (221_1h) may have a D-cut shape or a polygonal shape. The z-axis cross-sectional shape of the first arm hole (221_1h) may correspond to the shape of the z-axis cross-section of the first shaft (231).

[0104] The above first cam structure (221_1cam) is arranged to face (or contact) the first fixed cam portion (241a) of the cam member (241), and can perform a cam operation according to the rotation of the first arm member (221) while being pressed by the first elastic member (242a). For example, while the foldable electronic device (100) is placed at a specified angle (e.g., a specific angle between 0 degrees and 180 degrees), a protruding portion (ridge or protrusion) of the shape (cam profile) of the first cam structure (221_1cam) can be engaged with the protruding portion of the first fixed cam portion (241a), thereby compressing the first elastic member (242a) to a certain standard or more. While the upper part of the first cam structure (221_1cam) and the upper part of the first fixed cam portion (241a) are in contact, a compression amount of the first elastic member (242a) of a certain size or more is maintained, and the frictional force of the surrounding structures (e.g., friction plates) corresponding thereto can contribute to maintaining the foldable electronic device (100) at a specified angle.

[0105] The second arm portion (221_2) may include a fifth central portion (or the central portion of the second arm portion (221_2)) connected to the first arm body (221_3), a second rail groove (221_2r1) engraved in the -y-axis direction on one side (e.g., the side facing the y-axis direction) of the fifth central portion, and a second rail protrusion (221_2r2) protruding in the -y-axis direction on the other side (e.g., the side facing the -y-axis direction) of the fifth central portion. The second rail groove (221_2r1) may be fastened to a second link rail protrusion (223_1r) formed on the 21st link side wall (223_1) of the second link portion (223).

[0106] The second rail protrusion (221_2r2) may be fastened to (or face, contact with) a second link step (223_2r) formed on the 22nd link side wall (223_2) of the second link portion (223). For example, a surface (e.g., a lower surface) of the second rail protrusion (221_2r2) facing the -z-axis direction may face (or contact) a surface of the second link step (223_2r) facing the z-axis direction. A surface (e.g., a lower surface) of the second rail protrusion (221_2r2) facing the z-axis direction may face (or contact) a part of the first link cover (217) facing the -z-axis direction. As the first link cover (217) comes into contact with the second rail protrusion (221_2r2) while pressing at least a portion of the z-axis direction of the second rail protrusion (221_2r2) in the -z-axis direction, the distance between the first link cover (217) and the second rail protrusion (221_2r2) can be maintained at a constant level (e.g., maintained in a contact state). Accordingly, while the foldable electronic device (100) is folded or unfolded, the flow of the first arm member (221) is improved, so that the folding or unfolding operation of the foldable electronic device (100) can be performed more stably.

[0107] According to one embodiment, the second arm member (222) includes a second arm body, a third arm portion, and a fourth arm portion, wherein the second arm body corresponds to the first arm body (221_3) of the first arm member (221), the third arm portion corresponds to the first arm portion (221_1) of the first arm member (221), and the fourth arm portion corresponds to the second arm portion (221_2) of the first arm member (221). Accordingly, the description of the detailed structure of the second arm member (222) will be replaced with the description of the structure of the first arm member (221).

[0108] Meanwhile, in the description of the first type hinge structure (201) described above, the structures of the rail protrusion (or rail, rail structure) protruding from one side and the rail groove engraved (or sunken) from one side may be formed in opposite directions. For example, the protruding rail structure (or rail protrusion) formed on the first rotation member (211) may be changed to an engraved rail groove, and correspondingly, the first fixed rail groove (213a1) (or first rail groove, first groove) of the fixed bracket (213) coupled with the first rotation member (211) may be changed to a rail protrusion having a protruding structure. This structural change may be applied equally or similarly not only to the first rotation member (211), but also to the second rotation member (212), the first arm member (221), the second arm member (222), and the first link member (250_1) and the second link member (250_2) coupled thereto, respectively.

[0109] Referring to FIGS. 5 to 11, the first link cover (217) may include a first cover body (217_b) and a first coupling portion (217_cyl).

[0110] Referring to one side of the 1401 state and one side of the 1402 state of the first link cover (217), the first cover body (217_b) may include a portion in which at least a portion of an upper surface (or one surface) (e.g., a surface facing the z-axis) is formed flat, and the other portion may be formed with an incline. For example, the -x-axis edge of the first cover body (217_b) may be formed flat. An incline may be formed in the x-axis direction at the -x-axis edge of the first cover body (217_b). The incline of the first cover body (217_b) may include an incline corresponding to the upper surface in the z-axis direction of the first link connecting portion (215c) (or the second connecting portion (215_c2)). Although the shape in which the upper surface (or one surface) of the first cover body (217_b) is inclined is exemplified, the present invention is not limited thereto, and the entire upper surface of the first cover body (217_b) may be formed flat when viewed in the z-axis direction. At least a portion of the lower surface (e.g., the surface facing the -z-axis) of the first cover body (217_b) may include a portion in which an inclined portion is formed. For example, the lower surface of the first cover body (217_b) may include a first inclined portion (217_s1) facing the first rail protrusion (211_2r2) and a second inclined portion (217_s2) facing the second rail protrusion (221_2r2). At least a portion of each of the first inclined portion (217_s1) and the second inclined portion (217_s2) may include a curve. For example, the curvature of the first inclined portion (217_s1) may be formed to be similar or identical to the curvature of the facing first rail protrusion (211_2r2), and the curvature of the second inclined portion (217_s2) may be formed to be similar or identical to the curvature of the facing second rail protrusion (221_2r2). The curvature of the first rail protrusion (211_2r2) may be formed to be greater than the curvature of the second rail protrusion (221_2r2).In response to this, the curvature of the first inclined portion (217_s1) can be formed to be greater than the curvature of the second inclined portion (217_s2).

[0111] The length of the portion extending in the x-axis direction from the -x-axis edge and the -y-axis edge ends of the first cover body (217_b) and the length of the portion extending in the x-axis direction from the -x-axis edge and the y-axis edge ends of the first cover body (217_b) may be formed differently. Alternatively, the length of the -y-axis edge and the length of the y-axis edge of the first cover body (217_b) may be formed differently. As an example, the length of the -y-axis edge of the first cover body (217_b) arranged to cover at least a portion of the first rail protrusion (211_2r2) formed on the first rotating member (211) may be formed shorter than the length of the y-axis edge of the first cover body (217_b) arranged to cover at least a portion of the second rail protrusion (221_2r2) formed on the first arm member (221). Here, the length of the first rail protrusion (211_2r2) (or the second rail protrusion (221_2r2)) in the -x-axis or x-axis direction may be formed shorter (longer) than the length of the second rail protrusion (221_2r2) (the first rail protrusion (211_2r2)). According to one embodiment, the length of the first inclined portion (217_s1) may be formed shorter than the length of the second inclined portion (217_s2). Alternatively, the width of the first inclined portion (217_s1) (or the second inclined portion (217_s2)) may be formed smaller (larger) than the width of the second inclined portion (217_s2) (or the first inclined portion (217_s1)).

[0112] The first coupling portion (217_cyl) may protrude in the -z-axis direction from a portion (e.g., the central portion) of the first cover body (217_b), and may have a cylindrical shape with a hollow center by forming a first coupling hole (217_1h) in the -z-axis direction. According to one embodiment, the length of the first coupling portion (217_cyl) protruding in the -z-axis direction may be formed longer than the z-axis thickness of the first cover body (217_b). A pattern (e.g., female screw thread) that can be coupled with a coupling member (e.g., bolt) may be formed on the inside of the first coupling portion (217_cyl). Here, the first coupling portion (217_cyl) is used to couple with a separate coupling member, and its shape may be changed to another shape (e.g., a hook). The first connecting portion (217_cyl) may be inserted or fastened to the first connecting portion (215_c1) formed in the first link member (250_1) (or the first connecting portion (215_c1) of the first link connecting portion (215c)). For example, the first connecting portion (215_c1) may have a through hole formed that penetrates from the z-axis to the -z-axis direction, and at least a portion of the first connecting portion (217_cyl) may be inserted into the through hole formed in the first connecting portion (215_c1). In this regard, the diameter of the first connecting portion (217_cyl) may be formed to be similar to the diameter of the through hole formed in the first connecting portion (215_c1).

[0113] FIG. 12 is a drawing showing an example of an upper surface of a part of a first type hinge structure (201) according to one embodiment. FIG. 13 is a drawing showing an example of a side surface of a part of a first type hinge structure according to one embodiment. FIG. 14 is a drawing showing an example of an exploded state of a part of a first type hinge structure of FIG. 12.

[0114] Referring to FIGS. 1 to 11 and 12 to 14 described above, some configurations of a first type hinge structure according to one embodiment may include a first link member (250_1), a first rotation member (211), a first arm member (221), and a first link cover structure (217assy).

[0115] The first link member (250_1) may include a first link portion (215) to which a portion of the first rotation member (211) is connected, a second link portion (223) to which a portion of the first arm member (221) is connected, and a first link connecting portion (215c) connecting the first link portion (215) and the second link portion (223). The first link connecting portion (215c) may include a first connecting portion (215_c1) and a second connecting portion (215_c2). The first connecting portion (215_c1) may include a first cover connecting hole (215_ch1) penetrating from the z-axis in the -z-axis direction. The second connecting portion (215_c2) may include a second cover connecting hole (215_ch2) penetrating from the z-axis in the -z-axis direction. The first cover coupling hole (215_ch1) and the second cover coupling hole (215_ch2) are arranged parallel to each other and may be arranged on the same plane (e.g., on the xy plane). The peripheral portion surrounding the first connection portion (215_c1) may be formed higher in the z-axis direction than the peripheral portion surrounding the second connection portion (215_c2). According to one embodiment, the size of the first cover coupling hole (215_ch1) and the size of the second cover coupling hole (215_ch2) may be formed differently. For example, the size of the first cover coupling hole (215_ch1) may be formed larger than the size of the second cover coupling hole (215_ch2). The first coupling portion (217_cyl) of the first link cover (217) may be inserted into the first cover coupling hole (215_ch1). The above second cover coupling hole (215_ch2) can be used to couple the first link member (250_1) to a housing (e.g., the first housing (110) of FIG. 2).

[0116] The first link cover structure (217assy) may include a first link cover (217), a first coupling member (217_scr), and a first link elastic member (217_el). The first link cover (217) may be arranged to cover at least a portion of the first link connection portion (215c) from the z-axis direction to the -z-axis direction (or from the front to the rear direction of the display (160). For example, the first link cover (217) may be arranged to cover an upper portion (e.g., at least a portion in the z-axis direction) of the first connection portion (215_c1). While the first cover body (217_b) of the first link cover (217) is placed on a side wall surrounding the periphery of the first connection portion (215_c1), at least a portion of the first coupling portion (217_cyl) may be inserted and arranged into the first cover coupling hole (215_ch1). The first coupling member (217_scr) may protrude, for example, in the z-axis direction. For example, the first coupling member (217_scr) may be provided in a bolt shape and may be inserted into the first cover coupling hole (215_ch1) of the first coupling portion (217_cyl) in the z-axis direction from the -z-axis direction. The first coupling member (217_scr) may be inserted into the first cover coupling hole (215_ch1) and fastened to the first coupling portion (217_cyl). After being inserted into the first coupling member (217_scr), the first link elastic member (217_el) may be arranged to face the lower surface (e.g., the surface observed from the -z-axis) of the first connection portion (215_c1). As an example, the first link elastic member (217_el) may be provided as a spring or coil type spring and inserted into a bolt type first connecting member (217_scr).When the first coupling member (217_scr) is coupled to the first coupling portion (217_cyl), the first link elastic member (217_el) may be positioned between the lower surface of the first connecting portion (215_c1) and one side (e.g., the head portion of the bolt) of the first coupling member (217_scr), thereby performing a function of pulling the first link cover (217) in the -z-axis direction. Accordingly, the first link cover (217) may maintain a state of contact between one side of the first rotation member (211) and one side of the first arm member (221) while pressing one side of the first rotation member (211) and one side of the first arm member (221).

[0117] FIG. 15 is a drawing showing an example of a cross-section 15A`-15A of a part of a first type hinge structure according to one embodiment.

[0118] Referring to FIGS. 1 to 15, a part of a first type hinge structure according to an embodiment may include a first link member (250_1), a first rotation member (211), a first arm member (221), and a first link cover structure (217assy). A cross-section of the first link member (250_1) cut along a cutting line 15A`-15A includes a first link portion (215), a second link portion (223), and a first connecting portion (215_c1) connecting the first link portion (215) and the second link portion (223), and a first cover coupling hole (215_ch1) may be formed at the center of the first connecting portion (215_c1). A first coupling member (217_scr) may be coupled to the first cover coupling hole (215_ch1), and a first link elastic member (217_el) may be placed between the lower end of the first connecting portion (215_c1) and one side of the first coupling member (217_scr) (e.g., the head of the first coupling member (217_scr)).

[0119] The first link portion (215) may include at least a first link body (215_3), an eleventh link side wall (215_1), a twelfth link side wall (215_2), a first link fixing portion (215_4), a first link rail protrusion (215_1r), and a first link step (215_2r). One side of a first rotation member (211) may be fastened to the first link portion (215). A constant gap may be formed between the first link body (215_3) of the first link portion (215) and the rear surface (e.g., a surface facing the -z-axis direction) of the first rotation member (211). The first link rail protrusion (215_1r) of the first link portion (215) is connected to the first rail groove (211_2r1) of the first rotation member (211), and a part (e.g., at least a part of the surface facing the -z axis) of the first rail protrusion (211_2r2) of the first rotation member (211) may be placed on the first link step (215_2r) of the first link portion (215). At least a part of the first inclined part (217_s1) of the first link cover (217) may be placed on the upper part of the first rail protrusion (211_2r2) of the first rotation member (211). As the first link cover (217) is pressed in the -z-axis direction by the first link elastic member (217_el) and the first coupling member (217_scr), the first inclined portion (217_s1) can maintain contact with the upper end (e.g., at least a part facing the z-axis) of the first rail protrusion (211_2r2) while the first rotational member (211) performs a hinge operation. Alternatively, the first inclined portion (217_s1) can be arranged to press the first rail protrusion (211_2r2) of the first rotational member (211) in the -z-axis direction while being pressed by the first link elastic member (217_el) and the first coupling member (217_scr).

[0120] The second link portion (223) may include at least a second link body (223_3), a twenty-first link side wall (223_1), a twenty-second link side wall (223_2), a second link rail protrusion (223_1r), and a second link step (223_2r). One side of the first arm member (221) may be fastened to the second link portion (223). A predetermined gap may be formed between the second link body (223_3) of the second link portion (223) and the rear surface (e.g., the surface facing the -z-axis direction) of the first arm member (221). The second link rail protrusion (223_1r) of the second link portion (223) is connected to the second rail groove (221_2r1) of the first arm member (221), and a part (e.g., at least a part of a surface facing the -z-axis) of the second rail protrusion (221_2r2) of the first arm member (221) may be placed on the second link step (223_2r) of the second link portion (223). At least a part of the second inclined portion (217_s2) of the first link cover (217) may be placed on the upper part (e.g., at least a part facing the z-axis) of the second rail protrusion (221_2r2) of the first arm member (221). As the first link cover (217) is pressed in the -z-axis direction by the first link elastic member (217_el) and the first coupling member (217_scr), the second inclined portion (217_s2) can maintain contact with the upper end (e.g., at least a portion facing the z-axis) of the second rail protrusion (221_2r2) while the first arm member (221) performs the hinge operation. Alternatively, the second inclined portion (217_s2) can be arranged to press at least a portion of the second rail protrusion (221_2r2) of the first arm member (221) in the -z-axis direction while being pressed by the first link elastic member (217_el) and the first coupling member (217_scr).

[0121] The first link elastic member (217_el) may be arranged such that the first inclined portion (217_s1) and the second inclined portion (217_s2) are arranged so that the first link cover (217) presses a portion (e.g., an upper portion observed in the z-axis direction) of the first rail protrusion (211_2r2) of the first rotating member (211) and a portion (e.g., an upper portion observed in the z-axis direction) of the second rail protrusion (221_2r2) of the first arm member (221) in the -z-axis direction, respectively. For example, when there is a thickness deviation in the rail shape (e.g., a rail groove or a rail protrusion) of the rotating members (211, 212) or the arm members (221, 222), a tilting phenomenon of the link cover may occur. Since the rail thickness may vary depending on the product, one side of the link cover pressing the rotating members (211, 212) and the other side of the link cover pressing the female members (221, 222) may be formed unevenly. In this structure, the foldable electronic device (or hinge structure) according to one embodiment can provide a first gap (Gap A) between the head of the first coupling member (217_scr) and one side of the second link portion (223) (e.g., the 22nd link side wall (223_2)) (or one side of the first link portion (215)), and provide a second gap (Gap B) between the first coupling portion (217_cyl) of the first link cover (217) and one side of the first link portion (215) (e.g., the 12th link side wall (215_2)) (or one side of the second link portion (223)), thereby improving a tilting phenomenon (or a state of uneven height). The above first and second gaps (Gap A, Gap B) can prevent the first link cover (217) from tilting and contribute to the first link cover (217) uniformly pressuring the first rotation member (211) and the first arm member (221) in the z-axis direction.

[0122] FIG. 16 is a drawing showing an example of a partial configuration of a second type hinge structure according to one embodiment. FIG. 17 is a drawing showing an example of a third link cover and a fourth link cover among the second type hinge structures according to one embodiment. FIG. 18 is a drawing showing an example of a partial cross-section of a second type hinge structure according to one embodiment. FIG. 19 is a drawing showing an example of a partial cross-section of a second type hinge structure according to one embodiment.

[0123] Before the description, the second type hinge structure (202) according to the embodiment of the present invention may include the same configuration as the first type hinge structure (201) described above with reference to FIGS. 3 and 4, except for the configuration of the link cover structures (e.g., the third link cover structure (228assy) and the fourth link cover structure (229assy)) arranged on the first link member (250_1). Accordingly, the second type hinge structure (202) described below with reference to FIGS. 16 to 19 will be described with respect to the third and fourth link cover structures (228assy, ​​229assy). Additionally or alternatively, the structures of the third and fourth link cover structures (228assy, ​​229assy) described with reference to FIGS. 16 to 19 may be equally applied to the second link member (250_2) described above with reference to FIGS. 3 and 4. For example, the second type hinge structure (202) may further include a second link member (250_2) and a fifth link cover structure and a sixth link cover structure corresponding to the third and fourth link cover structures (228assy, ​​229assy) placed on the second link member (250_2). In addition, the foldable electronic device of the present disclosure may include a plurality of hinge structures, and each hinge structure may be applied with the first type hinge structure (201) described with reference to FIGS. 1 to 15 or with the second type hinge structure (202) described with reference to FIGS. 16 to 19. Alternatively, link cover structures of different types may be arranged within one hinge structure.For example, the first link member (250_1) and the third and fourth link cover structures (228assy, ​​229assy) described in FIGS. 16 to 19 may include a structure in which the first rotation member (211) and the first arm member (221) are coupled to each other, and the second rotation member (212) and the second arm member (222) described in FIGS. 1 to 15 may be arranged to be coupled to the second link member (250_2) at a position symmetrical with respect to the folding axis, with the second link cover structure. As an example, FIGS. 16 to 19 illustrate a hinge structure (or foldable electronic device) including both link cover structures (228assy, ​​229assy), but the embodiments of the present disclosure are not limited thereto. For example, the hinge structure (or foldable electronic device) of the present invention may include only one of the two link cover structures (228assy, ​​229assy).

[0124] Referring to FIGS. 1 to 19, the second type hinge structure (202) may include at least a first link member (250_1), a first rotation member (211), a first arm member (221), a third link cover structure (228assy), and a fourth link cover structure (229assy). The sliding operation distance (or rotation operation distance) of the first rotation member (211) based on the first link portion (215) and the sliding operation distance (or rotation operation distance) of the first arm member (221) based on the second link portion (221) may be different from each other. For example, the sliding operation distance of the first arm member (221) may be greater than the sliding operation distance of the first rotation member (211), and correspondingly, the moving speed of the first arm member (221) may be faster than the moving speed of the first rotation member (211). In response to this, the frictional force between the first arm member (221) and the second link portion (223) may be different from the frictional force between the first rotational member (211) and the first link portion (215). In the following description, link cover structures (228assy, ​​229assy) arranged to cover the first rotational member (211) and the first arm member (221), respectively, are provided to improve discomfort due to uneven frictional force (e.g., poor feeling due to operation, occurrence of joint noise when the hinge of a foldable electronic device is operated).

[0125] The first link member (250_1) may include the same structure as the first link member described above in FIGS. 3 to 15. For example, the first link member (250_1) may include a first link portion (215) to which one side of the first rotation member (211) is connected, a second link portion (223) to which one side of the first arm member (221) is connected, and a first link connection portion (215c) connecting the first link portion (215) and the second link portion (223).

[0126] The first rotation member (211) may include at least a first rail protrusion (211_2r2) and a first rail groove (211_2r1). Additionally or alternatively, as described above, the first rotation member (211) includes a first rotation body, a first rail structure, and a second rail structure (e.g., the first rotation body (211_3), the first rail structure (211_1), and the second rail structure (211_2) of FIG. 5), and the first rail protrusion (211_2r2) and the first rail groove (211_2r1) may be respectively arranged on a side surface of the second rail structure.

[0127] The first arm member (221) may include at least a second rail protrusion (221_2r2) and a second rail groove (221_2r1). Additionally or alternatively, as described above, the first arm member (221) may include a first arm body, a first arm portion, and a second arm portion (e.g., the first arm body (221_3), the first arm portion (221_1), and the second arm portion (221_2) of FIG. 5), and the second rail protrusion (221_2r2) and the second rail groove (221_2r1) may be respectively arranged on a side surface of the second arm portion.

[0128] In FIG. 17, the 1701 state represents a state observed in the -z-axis direction of the third link cover (228) and the fourth link cover (229), the 1703 state represents a first-direction perspective view of the third link cover (228) and the fourth link cover (229), and the 1705 state represents a second-direction perspective view of the third link cover (228) and the fourth link cover (229).

[0129] Referring to FIGS. 16 and 17, the third link cover (228) may include a third cover body (228_b) and a third coupling portion (228_cyl).

[0130] The third cover body (228_b) may include a portion in which at least a portion of a lower surface (e.g., a surface facing the -z-axis) is formed flat, and the other portion may include an incline. For example, the -y-axis edge of the third cover body (228_b) may include a third incline portion (228_s) (or a third curved portion), and the remaining at least a portion may be formed flat. The third incline portion (228_s) may be arranged to cover at least a portion of the upper end of the first rail protrusion (211_2r2) formed on the first rotation member (211). The third incline portion (228_s) may include a convex shape in the z-axis direction from the -z-axis. Alternatively, when observed from the -z-axis, the third incline portion (228_s) may include a concave shape. The inclination (or curvature) of the third inclined portion (228_s) may be formed to correspond to the inclination (or curvature) of the first rail protrusion (211_2r2) (to have a curvature that is the same or similar within a certain error range). A third connecting portion (228_cyl) may be formed in the central portion of the third cover body (228_b) to protrude in the -z-axis direction. The third connecting portion (228_cyl) may be provided in a cylindrical shape, and a third connecting hole (228_h) may be formed to penetrate the third connecting portion (228_cyl) and the third cover body (228_b) from the z-axis to the -z-axis direction. The third connecting portion (228_cyl) may have a size corresponding to a through hole formed in the first connecting portion (215_c1). The edge shapes in the x-axis direction and y-axis direction of the third cover body (228_b) can be formed to fit into the edge of the fourth cover body (229_b).

[0131] The fourth cover body (229_b) may include a portion in which at least a portion of a lower surface (e.g., a surface facing the -z-axis) is formed flat, and the other portion may include an incline. For example, the y-axis edge of the fourth cover body (229_b) may include a fourth incline portion (229_s) (or a fourth curved portion), and the remaining at least a portion may be formed flat. The fourth incline portion (229_s) may include a shape that is inclined from the -z-axis to the z-axis direction. The fourth incline portion (229_s) may be arranged to cover at least a portion of an upper end of a second rail protrusion (221_2r2) formed on the first arm member (221). The incline (or curvature) of the fourth incline portion (229_s) may be formed to correspond to the incline (or curvature) of the second rail protrusion (221_2r2) (to have a similar curvature within the same or a certain error range). A fourth connecting portion (229_cyl) may be formed on one side of the fourth cover body (229_b) to protrude in the -z-axis direction. The fourth connecting portion (229_cyl) may be provided in a cylindrical shape, and a fourth connecting hole (229_h) may be formed to penetrate the fourth connecting portion (229_cyl) and the fourth cover body (229_b) from the z-axis to the -z-axis direction. The fourth connecting portion (229_cyl) may have a size corresponding to the through hole formed in the second connecting portion (215_c2). The edge shapes of the -x-axis and y-axis directions of the fourth cover body (229_b) may be formed to engage with the edges of the x-axis and y-axis directions of the fourth cover body (229_b). The diameter of the third coupling hole (228_h) and the diameter of the fourth coupling hole (229_h) may be formed to be the same or similar, but may vary depending on design changes. The height of the third coupling portion (228_cyl) protruding from the upper surface (e.g., the surface facing the z-axis) of the third cover body (228_b) may be formed to be the same or similar to the height of the fourth coupling portion (229_cyl) formed on the fourth link cover (229).Alternatively, the third coupling portion (228_cyl) and the fourth coupling portion (229_cyl) may be formed at different heights.

[0132] Referring to FIGS. 16 to 18, the first link portion (215) may include, for example, at least a first link body (215_3), an eleventh link side wall (215_1), a twelfth link side wall (215_2), a first link rail protrusion (215_1r), and a first link step (215_2r) (or a first auxiliary rail). The first link connecting portion (215c) may include a first connecting portion (215_c1) to which a third link cover structure (228assy) is connected. The third link cover structure (228assy) may include a third link cover (228), a third connecting member (228_scr), and a third link elastic member (228_el).

[0133] The first rail groove (211_2r1) of the first rotation member (211) may be fastened with the first link rail protrusion (215_1r) formed on the 11th link side wall (215_1). The first rail protrusion (211_2r2) of the first rotation member (211) may be placed on the upper portion of the first link step (215_2r) formed on the 12th link side wall (215_2). The third inclined portion (228_s) of the third link cover (228) may be arranged to cover the upper portion (e.g., at least a portion facing the z-axis direction) of the first rail protrusion (211_2r2). The third link cover (228) may be coupled with the third connecting member (228_scr) with the first connecting portion (215_c1) therebetween. The third connecting member (228_scr) may include a bolt shape. A third link elastic member (228_el) may be disposed between the third link cover (228) and the header of the third connecting member (228_scr) or between the lower surface (the surface facing the -z-axis direction) of the first connecting portion (215_c1) and a portion (e.g., the header portion) of the third connecting member (228_scr). The third link elastic member (228_el) may perform a function of pulling the third link cover (228) in the -z-axis direction. The third inclined portion (228_s) of the third link cover (228) may maintain contact with the first rail protrusion (211_2r2) while the first rotation member (211) performs a hinge operation or maintains a specific mounting state due to the pulling force (e.g., tensile force or compressive force) of the third link elastic member (228_el).

[0134] Referring to FIGS. 16 to 19, the second link portion (223) may include, for example, at least a second link body (223_3), a twenty-first link side wall (223_1), a twenty-second link side wall (223_2), a second link rail protrusion (223_1r), and a second link step (223_2r) (or a second auxiliary rail). The first link connecting portion (215c) may include a second connecting portion (215_c2) to which a fourth link cover structure (229assy) is connected. The fourth link cover structure (229assy) may include a fourth link cover (229), a fourth connecting member (229_scr), and a fourth link elastic member (229_el).

[0135] The second rail groove (221_2r1) of the first arm member (221) may be fastened to the second link rail protrusion (223_1r) formed on the 21st link side wall (223_1). The second rail protrusion (221_2r2) of the first arm member (221) may be placed on the upper portion of the second link step (223_2r) formed on the 22nd link side wall (223_2). The fourth inclined portion (229_s) of the fourth link cover (229) may be arranged to cover the upper portion (e.g., at least a portion facing the z-axis direction) of the second rail protrusion (221_2r2). The fourth link cover (229) may be coupled to the fourth connecting member (229_scr) with the second connecting portion (215_c2) therebetween. The fourth connecting member (229_scr) may include a bolt shape. A fourth link elastic member (229_el) may be disposed between the fourth link cover (229) and the header of the fourth connecting member (229_scr) or between the lower surface (the surface facing the -z-axis direction) of the second connecting portion (215_c2) and a portion (e.g., the header portion) of the fourth connecting member (229_scr). The fourth link elastic member (229_el) may perform a function of pulling the fourth link cover (229) in the -z-axis direction. The fourth inclined portion (229_s) of the fourth link cover (229) may maintain contact with the second rail protrusion (221_2r2) while the first arm member (221) performs a hinge operation or maintains a specific mounting state by the pulling force (e.g., compressive force) of the fourth link elastic member (229_el).

[0136] As described above, the third link cover (228) of the third link cover structure (228assy) may be arranged to maintain contact with the first rail protrusion (211_2r2) of the first rotational member (211) based on the third link elastic member (228_el), and the fourth link cover (229) of the fourth link cover structure (229assy) may be arranged to maintain contact with the second rail protrusion (221_2r2) of the first arm member (221) based on the fourth link elastic member (229_el). In the arrangement relationship described above, since the third link cover structure (228assy) and the fourth link cover structure (229assy) are provided independently, the contact between the first rotational member (211) and the first arm member (221) and the link covers can be more stably maintained without affecting each other. Each link elastic member included in the above-described link cover structures (228assy, ​​229assy) may be configured to have a different elastic force size in response to the situation of the corresponding structure (e.g., the first rotation member (211) and the first arm member (221)). For example, the elastic force of the link elastic member included in the third link cover structure (228assy) may be set to be greater (or smaller) than the elastic force of the link elastic member included in the fourth link cover structure (229assy). In relation to the setting of different elastic forces, the type of the elastic member applied to the third link cover structure (228assy) and the type of the elastic member applied to the fourth link cover structure (229assy) may be different. Even if the same type of elastic member is applied to each link cover structure, the size of the elastic members applied to each link cover structure or the application ratio of each type of elastic member may be different. Based on the structure described above, the hinge structure of the present invention can provide the pressure required for each configuration in relation to improving hinge operation by implementing the magnitude of the force pressing the rotating members (211, 212) and the magnitude of the force pressing the female members (221, 222) differently.

[0137] FIG. 20 is a drawing showing an example of a partial configuration of a third type hinge structure according to one embodiment. FIG. 21 is a drawing showing an example of a third rotation member according to one embodiment. FIG. 22 is a drawing showing an example of a cross-section of one side of a third type hinge structure according to one embodiment.

[0138] Referring to FIGS. 20 to 22, a third type hinge structure (203) according to an embodiment may include at least a third link member (250_3), a first deformable rotation member (211ch), and a first arm member (221). The third type hinge structure (203) may further include other configurations of the hinge structures described above with reference to FIGS. 3 and 4, excluding the third link member (250_3), the first deformable rotation member (211ch), and the first arm member (221). The third type hinge structure (203) described below may be applied identically or similarly, or in duplicate, to other hinge structures described above with reference to FIGS. 1 to 19.

[0139] The third link member (250_3) may include a first deformed link portion (215ch), a second link portion (223), and a first link connection portion (215c). The third link member (250_3) described above may include the same or similar configuration as the first link member (250_1) described above in FIG. 6, except for the first deformed link portion (215ch). For example, the second link portion (223) of the third link member (250_3) may have the same or similar configuration as the second link portion (223) of the first link member (250_1), and the first link connection portion (215c) of the third link member (250_3) may have the same or similar configuration as the first link connection portion (215c) of the first link member (250_1). The first link cover (217) disposed on the first link connecting portion (215c) may have the same or similar configuration as the first link cover described above in FIG. 5, and the third type hinge structure (203) may further include a connecting member and a link elastic member (e.g., the same configuration as the first connecting member (217_scr) and the first link elastic member (217_el) described in FIG. 5) in relation to the arrangement of the first link cover (217).

[0140] Referring to FIGS. 7, 8, and 21, the first deformable rotation member (211ch) may include a first rotation body (211_3), a first rail structure (211_1), a second rail structure (211_2), and a rail pin (250_pin) (or a rotational axis of the second rail structure (211_2)). The first rotation body (211_3) and the first rail structure (211_1) may have the same or similar structure as the first rotation body (211_3) and the first rail structure (211_1) of the first rotation member (211) described above in FIGS. 7 and 8. For example, the first rail structure (211_1) may include a first rotation rail (211_1r1) and a second rotation rail (211_1r2) formed on side surfaces (e.g., one side in the y-axis and -y-axis directions) respectively, which are arranged to extend in the x-axis direction from the first rotation body (211_3) and to be inserted into fixed rail grooves (213a, 213a2) formed in the fixed bracket (213). A first rail protrusion (211_2r2) may be arranged on one side surface (e.g., the side surface in the -y-axis direction) of the second rail structure (211_2). The first rail protrusion (211_2r2) may be formed to protrude by a certain thickness in the -y-axis direction from the -y-axis side surface of the center of the second rail structure (211_2). Additionally, the second rail structure (211_2) may further include a first rail groove (e.g., the same rail groove as the first rail groove (211_2r1) of FIG. 7) as described above in FIG. 7. The first rail groove may be arranged on the y-axis side of the second rail structure (211_2). Meanwhile, FIG. 21 exemplifies a structure in which the first rail protrusion (211_2r2) is arranged on the -y-axis side of the second rail structure (211_2) and the first rail groove is arranged on the y-axis side of the second rail structure (211_2), but the present invention is not limited thereto. For example, the first rail protrusion (211_2r2) may be arranged on the y-axis side of the second rail structure (211_2) and the first rail groove may be arranged on the -y-axis side of the second rail structure (211_2).The positions of the link rail protrusion and link step formed in the first link portion (215) may be changed depending on the arrangement of the rail groove or rail protrusion of the first deformed rotation member (211ch).

[0141] According to one embodiment, the second rail structure (211_2) may include a rail through hole (211_2ph) penetrating from one side (e.g., the side facing -y) to the other side (e.g., the side facing the y-axis direction) and a rail pin (250_pin) at least partially inserted into the rail through hole (211_2ph). The diameter of the rail through hole (211_2ph) may be formed to be the same as or similar to the diameter of the rail pin (250_pin).

[0142] The above rail pin (250_pin) may be arranged to penetrate from one side of the first deformation link portion (215ch) (e.g., the side arranged to face the -y-axis direction of the first deformation link portion (215ch)) to the other side (e.g., the side arranged to face the second link portion (223) of the first deformation link portion (215ch)).

[0143] Referring to FIG. 6, FIG. 20 and FIG. 22, the first deformed link portion (215ch) includes an eleventh deformed link side wall (215ch_1h) and a twelfth deformed link side wall (215ch_2h), and holes may be formed in the eleventh deformed link side wall (215ch_1h) and the twelfth deformed link side wall (215ch_2h) so that at least a portion of a rail pin (250_pin) may be inserted therein from the -y-axis to the y-axis direction. Additionally, the first deformed link portion (215ch) may further include a first link body connecting the eleventh deformed link side wall (215ch_1h) and the twelfth deformed link side wall (215ch_2h). The holes formed in the 11th modified link side wall (215ch_1h) and the 12th modified link side wall (215ch_2h) of the above first modified link part (215ch) are formed so that the x-axis direction is longer than the z-axis direction, thereby providing a space in which the rail pin (250_pin) can slide a certain distance.

[0144] Although the separate link elastic member and the connecting member are not illustrated in the above FIG. 22, as previously shown in FIG. 14, the third link member (250_3) may further include a connecting member (e.g., the same configuration as the first connecting member (217_scr) of FIG. 14) and a link elastic member (e.g., the same configuration as the first link elastic member (217_el) of FIG. 14). Accordingly, while the first rotation rail (211_1r1) of the first deformed rotation member (211ch) is inserted into the fixed bracket (213) (e.g., the first fixed rail groove (213a1) of FIG. 3), and the rail pin (250_pin) is inserted into the rail through hole (211_2ph) formed in the second rail structure (211_2) of the first deformed rotation member (211ch) and fastened to the side walls of the first deformed link portion (215ch), the first link cover (217) can maintain contact with one side of the first rail protrusion (211_2r2) of the first deformed rotation member (211ch).

[0145] FIG. 23 is a drawing showing an example of a partial configuration of a fourth type hinge structure according to one embodiment. FIG. 24 is a drawing showing an example of a cross-section taken along the 23A-23A` cutting line of the fourth type hinge structure according to one embodiment.

[0146] Referring to FIGS. 23 and 24, at least a portion of a fourth type hinge structure (204) according to an embodiment may include a first link member (250_1) and a modified link cover structure (217ch_assy). Additionally, the fourth type hinge structure (204) may further include at least some of the hinge structures described above with reference to FIGS. 3 to 22. For example, the fourth type hinge structure (204) may further include a first rotation member (211) coupled with a first link portion (215) of the first link member (250_1), and a first arm member (221) coupled with a second link portion (223).

[0147] The first link member (250_1) may include a first link portion (215), a second link portion (223), and a first link connecting portion (215c). A part of a first rotation member (e.g., the first rotation member (211) described in FIG. 3) may be fastened to the first link portion (215), and a first arm member (e.g., the first arm member described in FIG. 3) may be fastened to the second link portion (223). The first link connecting portion (215c) may include a first connecting portion (215_c1) including a first cover connecting hole (215_ch1) into which one side of the first link cover (217) is inserted, and a second connecting portion (215_c2) adjacent to or connected to the first connecting portion (215_c1) and including a second cover connecting hole (215_ch2). These first link portion (215), second link portion (223), and first link connection portion (215c) may have the same or similar structure as the structure described above in FIG. 6.

[0148] The above-described deformable link cover structure (217ch_assy) may include a first link cover (217), a first coupling member (217_scr), and a deformable elastic member (217_ch_el). In the deformable link cover structure (217ch_assy), the first link cover (217) and the first coupling member (217_scr) may have the same or similar structure as the first link cover and the first coupling member described above with reference to FIGS. 11 and 14.

[0149] The above-described deformable elastic member (217_ch_el) may include at least one disk spring. This deformable elastic member (217_ch_el) may have a different structure from the coil shape of the first link elastic member (217_el) illustrated in FIGS. 13 to 15 above. For example, the deformable elastic member (217_ch_el) may provide higher elasticity than the first link elastic member (217_el). Meanwhile, the shape of the deformable elastic member (217_ch_el) is intended to illustrate that the hinge structure of the present disclosure is not limited to the shape of the link elastic member, and the deformable elastic member (217_ch_el) may include both a disk spring and a coil spring. The above-described deformable elastic member (217_ch_el) may be applied to at least some of the other hinge structures described in FIGS. 1 to 22 above.

[0150] Based on at least some of the above-described embodiments, one embodiment of the present disclosure comprises a foldable electronic device (100) including a display (160), a first housing (110) and a second housing (120) in which at least a portion of the display is accommodated, at least one hinge structure (200a, 200b) connecting the first and second housings, and a hinge housing (150) in which at least a portion of the at least one hinge structure is disposed (or seated). The at least one hinge structure may include a first rotation member (211) that rotates about a first axis, a first arm member (221) that rotates in response to the rotation of the first rotation member, a second rotation member (212) that rotates in response to the rotation of the second rotation member, a second arm member (222) that rotates in response to the rotation of the second rotation member, and a first link member (250_1) that is connected to the first rotation member and the first arm member. The first rotating member includes a first rail protrusion (211_2r2) formed on a first side of the first rotating member, and a first rail groove (211_2r1) formed on a second side of the first rotating member arranged in an opposite direction to the first side, wherein the first rail protrusion may protrude from a surface of the first side, and the first rail groove may be formed to be engraved from a surface of the second side.

[0151] According to one embodiment, the first link member may include a first link portion (215) connected to the first rotation member, a second link portion (223) connected to the first arm member, and a first link connection portion (215c) connecting the first link portion and the second link portion, and the first link portion may include a first link body (215_3), a first side wall (215_1) formed on one edge of the first link body and having a first link rail protrusion connected to the first rail groove, and a second side wall (215_2) formed on the other edge of the first link body and having a first link step formed to face one surface of the first rail protrusion.

[0152] According to one embodiment, the foldable electronic device may further include a first link cover structure (228assy) arranged to press a portion of the first rotating member toward the first housing.

[0153] According to one embodiment, the first link cover structure may include a first link cover (228) disposed on the first link connection portion and arranged to cover a portion of the first rail protrusion, a first coupling member (228_scr) fastened to the first link cover, and a first link elastic member (217_el) disposed between the first link connection portion and one side of the first coupling member.

[0154] According to one embodiment, the first link elastic member may include at least one of a disc spring and a coil spring.

[0155] According to one embodiment, the first link cover may include a first inclined portion (217_s1) facing one side of the first rail protrusion.

[0156] According to one embodiment, the first curvature of the first inclined portion can be formed to be the same as the curvature of the first rail protrusion.

[0157] According to one embodiment, the first arm member includes a first arm body (221_3), a first arm portion (221_1) formed in a first direction from the first arm body, a second arm portion (221_2) formed in a second direction from the first arm body and connected to the second link portion, and the second arm portion may include a second rail groove (221_2r1) formed on a first side of the second arm portion, and a second rail protrusion (221_2r2) formed on a second side of the second arm portion.

[0158] According to one embodiment, the second link portion may include a second link body (223_3), a third side wall (223_1) formed on one edge of the second link body and having a second link rail protrusion (223_1r) formed thereon to be fastened with the second rail groove, and a fourth side wall (223_2) formed on the other edge of the second link body and having a second link step (223_2r) formed thereon to be fastened with the second rail protrusion.

[0159] According to one embodiment, the foldable electronic device (100) may further include a second link cover structure (229assy) arranged to press a portion of the first arm member toward the first housing.

[0160] According to one embodiment, the second link cover structure may include a second link cover (229) disposed on the first link connecting portion and arranged to cover a portion of the second rail protrusion, a second connecting member (229_scr) fastened to the second link cover, and a second link elastic member (229_el) disposed between the first link connecting portion and one side of the second connecting member.

[0161] According to one embodiment, the first link cover may include a second inclined portion (229_s) covering an upper side of the second rail protrusion.

[0162] According to one embodiment, the second curvature of the second inclined portion can be formed to be the same as the curvature of the second rail protrusion.

[0163] According to one embodiment, the first arm member includes a first arm body (221_3), a first arm portion (221_1) formed in a first direction from the first arm body, a second arm portion (221_2) formed in a second direction from the first arm body and connected to the second link portion, the second arm portion includes a second rail groove (221_2r1) formed on a first side of the second arm portion, and a second rail protrusion (221_2r2) formed on a second side of the second arm portion, and the first link member includes a first link portion (215) connected to the first rotation member, a second link portion (221) connected to the first arm member, and a first link connection portion (215c) connecting the first link portion and the second link portion, and the first link portion includes a first link body (215_3), formed on one edge of the first link body and connected to the first rail groove. A first side wall (215_1) having a first link rail protrusion (215_1r) formed thereon, a second side wall (215_2) having a first link step (215_2r) formed on the other edge of the first link body and facing one surface of the first rail protrusion, and the second link portion may include a second link body (223_3), a third side wall (223_1) having a second link rail protrusion (223_1r) formed on one edge of the second link body and coupled with the second rail groove, and a fourth side wall (223_2) having a second link step (223_2r) formed on the other edge of the second link body and coupled with the second rail protrusion.

[0164] According to one embodiment, the foldable electronic device may further include a link cover structure (217assy) arranged to press a portion of the first rotating member and a portion of the first arm member toward the first housing.

[0165] According to one embodiment, the link cover structure may include a link cover (217) arranged to cover a portion of the first rail protrusion and a portion of the second rail protrusion, a connecting member (217_scr) connected to the link cover, and a first link elastic member (217_el) arranged between the link connection portion and one side of the connecting member.

[0166] According to one embodiment, the first link cover includes a first inclined portion (217_s1) facing one side of the first rail protrusion, and a second inclined portion (217_s2) facing one side of the second rail protrusion, and the curvature of the first inclined portion and the curvature of the second inclined portion may be formed differently.

[0167] According to one embodiment, the curvature of the first inclined portion may be formed to be greater than the curvature of the second inclined portion.

[0168] According to one embodiment, the first rotation member further includes a through hole (211_2ph) penetrating the first side and the second side, and the first link member includes a first link portion (215) connected to the first rotation member, a second link portion (223) connected to the first arm member, and a first link connection portion (215c) connecting the first link portion and the second link portion, and the first link portion includes a first link body (215_3), a first side wall (215_1) formed on one edge of the first link body and having a first link rail protrusion (215_1r) connected to the first rail groove, a second side wall (215_2) formed on the other edge of the first link body and having a first link step (215_2r) facing one surface of the first rail protrusion, and a first hole formed on one side of the first side wall and formed on the second side wall. The second hole may include a rail pin (250_pin) arranged to penetrate the first hole, the second hole, and the through hole.

[0169] According to one embodiment, the foldable electronic device includes a fixed bracket (213) disposed in the hinge housing, and the fixed bracket may include a bracket body (213a3), a first fixed rail groove (213a1) formed in the bracket body and coupled with a portion of a first rotation member (211), and a second fixed rail groove (213a2) formed in the bracket body and coupled with a portion of a second rotation member (212).

[0170] According to one embodiment of the present disclosure, a hinge structure includes a first rotation member (211) that rotates about a first axis, a first arm member (221) that rotates in response to the rotation of the first rotation member, a second rotation member (212) that rotates about a second axis, a second arm member (222) that rotates in response to the rotation of the second rotation member, and a first link member (250_1) that is connected to the first rotation member and the first arm member, wherein the first rotation member includes a first rail protrusion (211_2r2) formed on a first side surface of the first rotation member, and a first rail groove (211_2r1) formed on a second side surface of the first rotation member that is disposed in an opposite direction to the first side surface, wherein the first rail protrusion may be formed to be engraved from the surface of the second side surface.

[0171] According to one embodiment, the electronic device of various embodiments disclosed in the present document may include a mobile communication electronic device, and may be provided as included in a computer program product related to the operation of the mobile communication electronic device. The computer program product may be traded as a commodity between a seller and a buyer. The computer program product may be distributed in the form of a machine-readable storage medium (e.g., compact disc read only memory (CD-ROM)), or may be distributed online (e.g., downloaded or uploaded) via an application store (e.g., Play Store™) or directly between two user devices (e.g., smart phones). In the case of online distribution, at least a portion of the computer program product may be temporarily stored or temporarily generated in a machine-readable storage medium, such as the memory of a manufacturer's server, an application store's server, or a relay server.

[0172] According to various embodiments, each component (e.g., a module or a program) of the above-described components may include one or more entities, and some of the entities may be separated and placed in other components. According to various embodiments, one or more components or operations of the aforementioned components may be omitted, or one or more other components or operations may be added. Alternatively or additionally, a plurality of components (e.g., a module or a program) may be integrated into a single component. In such a case, the integrated component may perform one or more functions of each of the plurality of components identically or similarly to those performed by the corresponding component among the plurality of components prior to the integration. According to various embodiments, the operations performed by a module, program, or other component may be executed sequentially, in parallel, iteratively, or heuristically, or one or more of the operations may be executed in a different order, omitted, or one or more other operations may be added.

Claims

1. In a foldable electronic device, Display (160), A first housing (110) and a second housing (120) in which at least a portion of the above display is stored, At least one hinge structure (200a, 200b) that connects the first housing and the second housing, a hinge housing (150) in which at least a part of the at least one hinge structure is arranged; At least one of the above hinge structures A first rotating member (211) that rotates around a first axis; A first arm member (221) that rotates in response to the rotation of the first rotating member; A second rotating member (212) that rotates around a second axis; A second arm member (222) that rotates in response to the rotation of the second rotating member; It includes a first link member (250_1) connected to the first rotating member and the first arm member; The above first rotating member is, A first rail projection (211_2r2) formed on the first side of the first rotating member; Including a first rail groove (211_2r1) formed on a second side positioned opposite to the first side of the first rotating member; The above first rail projection protrudes from the surface of the first side, A foldable electronic device, characterized in that the first rail home is formed by being engraved from the surface of the second side.

2. In paragraph 1, The above first link absence is, A first link portion (215) connected to the first rotating member; A second link portion (223) connected to the first female member; Including a first link connecting portion (215c) connecting the first link portion and the second link portion; The above first link part, First link body (215_3); A first side wall (215_1) formed on one edge of the first link body and having a first link rail protrusion formed thereon to be connected to the first rail groove; A foldable electronic device, characterized in that it includes a second side wall (215_2) formed on the other edge of the first link body and having a first link step formed thereon facing one surface of the first rail protrusion.

3. In paragraph 2, A foldable electronic device, characterized in that it further includes a first link cover structure (228assy) arranged to press a part of the first rotating member toward the first housing.

4. In paragraph 3, The above first link cover structure, A first link cover (228) arranged on the first link connecting portion and arranged to cover a part of the first rail projection; A first connecting member (228_scr) connected to the first link cover; A foldable electronic device characterized by including a first link elastic member (217_el) disposed between the first link connecting portion and one side of the first coupling member.

5. In paragraph 4, The above first link elastic member A foldable electronic device characterized by comprising at least one of a disc spring and a coil spring.

6. In paragraph 4, The above first link cover, Including a first inclined portion (217_s1) facing one side of the first rail projection; The first curvature of the first inclined portion is, A foldable electronic device characterized in that the first rail projection is formed with the same curvature.

7. In paragraph 2, The above first cancer absence is, 1st cancer body (221_3); A first arm portion (221_1) formed in the first direction in the first arm body; It includes a second arm portion (221_2) formed in the second direction in the first arm body and connected to the second link portion; The above second cancer part is, A second rail groove (221_2r1) formed on the first side of the second arm portion; A foldable electronic device, characterized in that it includes a second rail protrusion (221_2r2) formed on a second side of the second arm portion.

8. In paragraph 7, The above second link part, Second link body (223_3); A third side wall (223_1) formed on one edge of the second link body and having a second link rail protrusion (223_1r) formed thereon and connected to the second rail groove; A foldable electronic device, characterized in that it includes a fourth side wall (223_2) formed on the other edge of the second link body and having a second link step (223_2r) formed thereon and connected to the second rail protrusion.

9. In paragraph 8, A foldable electronic device further comprising a second link cover structure (229assy) arranged to press a portion of the first arm member toward the first housing.

10. In paragraph 9, The above second link cover structure, A second link cover (229) arranged on the first link connecting portion and arranged to cover a part of the second rail protrusion; A second connecting member (229_scr) connected to the second link cover; A foldable electronic device characterized by including a second link elastic member (229_el) disposed between the first link connecting portion and one side of the second connecting member.

11. In paragraph 10, The above first link cover, Including a second inclined portion (229_s) covering an upper side of the second rail projection; The second curvature of the second inclined portion is, A foldable electronic device characterized in that the second rail projection is formed with the same curvature.

12. In paragraph 1, The above first cancer absence is, 1st cancer body (221_3); A first arm portion (221_1) formed in the first direction in the first arm body; It includes a second arm portion (221_2) formed in the second direction in the first arm body and connected to the second link portion; The above second cancer part, A second rail groove (221_2r1) formed on the first side of the second arm portion; Including a second rail protrusion (221_2r2) formed on the second side of the second arm portion; The above first link absence is, A first link portion (215) connected to the first rotating member; A second link portion (221) connected to the first female member; Including a first link connecting portion (215c) connecting the first link portion and the second link portion; The above first link part, First link body (215_3); A first side wall (215_1) formed on one edge of the first link body and having a first link rail protrusion (215_1r) formed thereon to be connected with the first rail groove; A second side wall (215_2) formed on the other side edge of the first link body and having a first link step (215_2r) formed facing one side of the first rail projection; The above second link part, Second link body (223_3); A third side wall (223_1) formed on one edge of the second link body and having a second link rail protrusion (223_1r) formed thereon and connected to the second rail groove; A foldable electronic device, characterized in that it includes a fourth side wall (223_2) formed on the other edge of the second link body and having a second link step (223_2r) formed thereon and connected to the second rail protrusion.

13. In paragraph 12, Further comprising a link cover structure (217assy) arranged to press a part of the first rotating member and a part of the first arm member toward the first housing; The above link cover structure, A link cover (217) arranged to cover a part of the first rail projection and a part of the second rail projection; A connecting member (217_scr) connected to the above link cover; Including a first link elastic member (217_el) arranged between the link connecting portion and one side of the connecting member; The above first link cover, A first inclined portion (217_s1) facing one side of the first rail projection; Including a second inclined portion (217_s2) facing one side of the second rail projection; A foldable electronic device, characterized in that the curvature of the first inclined portion is greater than the curvature of the second inclined portion.

14. In paragraph 1, The above first rotating member is, Further comprising a through hole (211_2ph) penetrating the first side and the second side; The above first link absence is, A first link portion (215) connected to the first rotating member; A second link portion (223) connected to the first female member; Including a first link connecting portion (215c) connecting the first link portion and the second link portion; The above first link part, First link body (215_3); A first side wall (215_1) formed on one edge of the first link body and having a first link rail protrusion (215_1r) formed thereon to be connected with the first rail groove; A second side wall (215_2) formed on the other edge of the first link body and having a first link step (215_2r) facing one side of the first rail projection; A first hole formed on one side of the first side wall and a second hole formed on the second side wall; A foldable electronic device, characterized in that it comprises a rail pin (250_pin) arranged to penetrate the first hole, the second hole, and the through hole.

15. In paragraph 1, Including a fixed bracket (213) arranged in the above hinge housing, The above fixed bracket; Bracket body (213a3); A first fixed rail groove (213a1) formed on the above bracket body and coupled with a part of the first rotating member (211); A foldable electronic device characterized by including a second fixed rail groove (213a2) formed on the bracket body and coupled with a part of a second rotating member (212).

Images