Hinge assembly and foldable electronic device including same

Abstract

Disclosed is a hinge assembly comprising: a first arm member fastened to a first shaft; a second arm member fastened to a second shaft; a first interlocking gear including a third cam structure; a second interlocking gear including a fourth cam structure; a third shaft coupled to the first interlocking gear; a fourth shaft coupled to the second interlocking gear; a first cam member disposed in a first direction of the first interlocking gear and the second interlocking gear; at least one bracket coupled to at least one of the first shaft, the second shaft, the third shaft, or the fourth shaft; a first elastic assembly set to press the first cam member in a second direction opposite to the first direction to maintain contact between the first cam member and the third cam structure and fourth cam structure; and a second elastic assembly set to press the third shaft and the fourth shaft in the first direction so as to maintain the contact.

Description

Hinge assembly and foldable electronic device including the same

[0001] Embodiments disclosed in this document relate to a hinge assembly and a foldable electronic device including the same.

[0002] Electronic devices should provide a large screen for ease of use and viewing, and can be folded or otherwise reduced in size for easy portability when not in use. For example, an electronic device may be configured to be folded for easy portability through a hinge assembly, and may include a flexible display to provide a large screen when unfolded. Furthermore, the electronic device may provide various folding angles to improve usability. For example, the hinge assembly may be configured such that the angle formed by the two housings can be maintained within a predetermined range. When the electronic device is folded, the display layout can be adjusted to correspond to the folding angle, thereby providing a variety of user environments.

[0003] The above information may be provided as background art to aid in understanding the present disclosure. No claim or determination is made as to whether any of the above is applicable as prior art in connection with the present disclosure.

[0004] A hinge assembly (240, 240-1) according to one embodiment disclosed in the present document comprises: a first arm member (410) including a first main gear (171) that is connected to a first shaft (131) extending in a first direction and includes a first cam structure (450); a second arm member (420) including a second main gear (172) that is connected to a second shaft (132) extending in the first direction and includes a second cam structure (470); a first linkage gear (1731) that is engaged with the first main gear (171) and includes a third cam structure (1791); a second linkage gear (1732) that is engaged with the second main gear (172) and includes a fourth cam structure (1792); a third shaft (133) that is coupled with the first linkage gear (1731) and formed parallel to the first shaft (131); and the second linkage A fourth shaft (134) coupled with the gear (1732) and formed in parallel with the second shaft (132), a first cam member (560) disposed in the first direction of the first linkage gear (1731) and the second linkage gear (1732) so as to be at least partially penetrated by the third shaft (133) and the fourth shaft (134) and to face the third cam structure (1791) and the fourth cam structure (1792), at least one bracket (610, 630, 650, 270) coupled with at least one of the first shaft (131), the second shaft (132), the third shaft (133), and the fourth shaft (134), so that contact between the first cam member (560) and the third cam structure (1791) and contact between the first cam member (560) and the fourth cam structure (1792) are maintained. A first elastic assembly (110) set to pressurize the first cam member (560) in a second direction opposite to the first direction;And it may include a second elastic assembly (120) that is set to press the third shaft (133) and the fourth shaft (134) in the first direction so that contact between the first cam member (560) and the third cam structure (1791) and contact between the first cam member (560) and the fourth cam structure (1792) are maintained.

[0005] A foldable electronic device according to one embodiment disclosed in the present document may include at least one hinge assembly and a first housing and a second housing formed to be foldable around the at least one hinge assembly. The at least one hinge assembly comprises a first arm member (410) including a first main gear (171) that is coupled to a first shaft (131) extending in a first direction and includes a first cam structure (450), a second arm member (420) including a second main gear (172) that is coupled to a second shaft (132) extending in the first direction and includes a second cam structure (470), a first linkage gear (1731) that is engaged with the first main gear (171) and includes a third cam structure (1791), a second linkage gear (1732) that is engaged with the second main gear (172) and includes a fourth cam structure (1792), a third shaft (133) that is coupled with the first linkage gear (1731) and formed parallel to the first shaft (131), and a second linkage gear (1732) that is coupled with the second linkage gear (1732) and formed parallel to the second shaft (132). A first cam member (560) disposed in the first direction of the first linkage gear (1731) and the second linkage gear (1732) so as to face the third cam structure (1791) and the fourth cam structure (1792), at least a portion of which is penetrated by the fourth shaft (134), the third shaft (133) and the fourth shaft (134), and at least one bracket (610, 630, 650, 270) coupled with at least one of the first shaft (131), the second shaft (132), the third shaft (133), and the fourth shaft (134), and set to press the first cam member (560) in a second direction opposite to the first direction so as to maintain contact between the first cam member (560) and the third cam structure (1791) and contact between the first cam member (560) and the fourth cam structure (1792). First elastic assembly (110),And it may include a second elastic assembly (120) that is set to press the third shaft (133) and the fourth shaft (134) in the first direction so that contact between the first cam member (560) and the third cam structure (1791) and contact between the first cam member (560) and the fourth cam structure (1792) are maintained.

[0006] FIG. 1A is a front perspective view of an electronic device according to one embodiment.

[0007] FIG. 1b is a plan view of the rear side of an electronic device according to one embodiment.

[0008] FIG. 2 is an exploded perspective view of a portion of the electronic device of FIGS. 1A and 1B including a hinge device, according to one embodiment.

[0009] FIG. 3A is a perspective view illustrating an example of a hinge assembly of an electronic device according to one embodiment.

[0010] FIG. 3b is a drawing showing an example of a combined configuration of a hinge assembly and a hinge housing of an electronic device according to one embodiment.

[0011] FIG. 4 is a plan view illustrating an example of a hinge assembly of an electronic device according to one embodiment.

[0012] FIG. 5 is an exploded perspective view illustrating an example of a hinge assembly of an electronic device according to one embodiment.

[0013] FIG. 6 is a cross-sectional view illustrating an example of a hinge assembly including a flow-preventing structure according to one embodiment.

[0014] FIG. 7 is a drawing showing an example of a first arm member according to one embodiment.

[0015] FIG. 8 is a drawing showing an example of a gear bracket included in a flow prevention structure according to one embodiment.

[0016] FIG. 9 is a drawing showing an example of a linkage gear of a hinge assembly according to one embodiment.

[0017] FIG. 10 is a drawing showing an example of a cam member of a hinge assembly according to one embodiment.

[0018] FIG. 11 is a drawing showing an example of a shaft bracket included in a flow prevention structure according to one embodiment.

[0019] FIG. 12 is a drawing showing an example of a shaft of a hinge assembly according to one embodiment.

[0020] FIG. 13 is a perspective view illustrating a coupling relationship between components of a flow-preventing structure and a hinge assembly according to one embodiment.

[0021] FIG. 14 is a drawing showing an example of a state in which force is transmitted in a first direction to a flow-preventing structure according to one embodiment.

[0022] FIG. 15 is a drawing showing an example of a state in which force is transmitted in a second direction to a flow-preventing structure according to one embodiment.

[0023] FIG. 16A is a drawing showing an example of a hinge assembly of an electronic device according to one embodiment.

[0024] FIG. 16b is a drawing showing an example of a hinge assembly of an electronic device according to one embodiment.

[0025] FIG. 17 is a drawing showing an example of a hinge assembly in an unfolded state of an electronic device according to one embodiment.

[0026] FIG. 18 is a drawing showing an example of a hinge assembly in a partially folded state of an electronic device according to one embodiment.

[0027] FIG. 19 is a drawing showing an example of a hinge assembly in a fully folded state of an electronic device according to one embodiment.

[0028] In connection with the description of the drawings, the same or similar reference numerals may be used for identical or similar components.

[0029] Hereinafter, various embodiments of the present invention will be described with reference to the attached drawings. However, this is not intended to limit the present invention to specific embodiments, and it should be understood that the present invention encompasses various modifications, equivalents, and / or alternatives of the embodiments.

[0030] An electronic device according to one embodiment disclosed in the present document is a foldable electronic device formed to be foldable around at least one hinge assembly, and may include an electronic device such as a smartphone, a tablet, or a laptop. The hinge assembly of the electronic device according to one embodiment may include a plurality of organically interlocking components to implement natural movement during the folding and / or unfolding process of the electronic device.

[0031] An electronic device according to an embodiment may further include a separate member (e.g., a bracket) or structure (e.g., an elastic body) to prevent play and resulting movement of the components due to dimensional deviation and / or assembly deviation of a plurality of components included in a hinge assembly. For example, a dimensional deviation may occur in a linkage gear (e.g., an idler gear) configured to allow two housings, which are foldable and / or unfoldable around the hinge assembly, to rotate in conjunction with each other. Considering that a friction configuration (e.g., a cam shape) may be formed in the linkage gear in accordance with the trend toward miniaturization of electronic devices, a dimensional deviation occurring in the linkage gear may cause a loss of contact between the cam shape of the linkage gear and the cam member of the hinge assembly. Therefore, a configuration or structure capable of eliminating the dimensional deviation of the linkage gear may be required to uniformly maintain the frictional force of the hinge assembly so that the electronic device can stably maintain a folded state.

[0032] According to one embodiment disclosed in the present document, a hinge assembly of an electronic device (e.g., hinge assembly (240, 240-1) of FIG. 2) may include a movement prevention structure (e.g., movement prevention structure (601) of FIG. 5) configured to prevent occurrence of dimensional deviation of a linkage gear (e.g., first linkage gear (1731) of FIG. 5, second linkage gear (1732) of FIG. 5). As an example, the movement prevention structure (601) may include at least one bracket (e.g., second gear bracket (630) of FIG. 5 and second shaft bracket (650) of FIG. 5) and a fixing member (670).

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

[0034] FIG. 1A is a front perspective view of an electronic device according to one embodiment.

[0035] FIG. 1b is a plan view of the rear side of an electronic device according to one embodiment.

[0036] Referring to FIGS. 1A and 1B , in one embodiment, an electronic device (200) (e.g., a foldable electronic device) may include a first housing (210) (e.g., a first housing structure) including a first side member (213) (e.g., a side bezel) and a second housing (220) (e.g., a second housing structure) including a second side member (223) (e.g., a side bezel) that are foldably coupled to each other about a folding axis (F) through at least one hinge assembly (240, 240-1) (e.g., a hinge structure, a hinge module, or a hinge device). For example, the first housing (210) and the second housing (220) may be configured as a foldable housing (e.g., a housing structure). For example, the electronic device (200) may include a first display (230) (e.g., a flexible display, a foldable display, or a main display) arranged to be supported by a first housing (210) and a second housing (220). For example, the first housing (210) may include a first side (211) and a second side (212) facing in an opposite direction (e.g., a -z-axis direction) of the first side (211). For example, the second housing (220) may include a third side (221) and a fourth side (222) facing in an opposite direction (e.g., a -z-axis direction) of the third side (221). For example, the first housing (210) may include a first rear cover (214) coupled with a first side member (213). For example, the second housing (220) may include a second rear cover (224) coupled with a second side member (223). For example, when the electronic device (200) is in a fully unfolded first state (e.g., an unfolded state or an unfolded state), the first side (211) and the third side (221) may be operated so that they face substantially the same direction (e.g., the +z-axis direction).For example, when the electronic device (200) is in a fully folded second state (e.g., a folded state or a collapsed state), the first side (211) and the third side (221) may be operated so that they face each other or face in opposite directions. For example, the electronic device (200) may also be operated so as to maintain a third state (e.g., an intermediate state) between the first state and the second state.

[0037] According to one embodiment, the electronic device (200) may include a first receiver (201), at least one first sensor module (204) (e.g., an ambient light sensor) and / or at least one first camera module (205) (e.g., a UDC, under display camera) disposed on a first side (211) of the first housing (210). For example, the electronic device (200) may include at least one key (206) disposed on a first side member (213). For example, the electronic device (200) may include at least one second camera module (208) and / or a flash (209) disposed on a second side (212) of the first housing (210) (e.g., a first rear cover (214)). For example, the electronic device (200) may include a second display (231) disposed on a fourth side (222) of a second housing (220), at least one third camera module (225) (e.g., UDC, under display camera), at least one second sensor module (226), and / or a second receiver (227). For example, the second display (231) may be disposed to be visible from the outside through at least a portion of the second rear cover (224). For example, the electronic device (200) may include a speaker (202) disposed on a second side member (223), a microphone (203) disposed on a first side member (213), and / or a connector port (207). At least some of the aforementioned components may be disposed in the first housing (210) and / or the second housing (220).

[0038] According to one embodiment, the first display (230) (e.g., a flexible display) may include a first region (230a) (e.g., a first planar portion) corresponding to at least a portion of the first surface (211), a second region (230b) (e.g., a second planar portion) corresponding to at least a portion of the third surface (221), and a third region (230c) (e.g., a flexible portion) connecting the first region (230a) and the second region (230b) and being deformable in a second state (e.g., a folded state) and / or a third state of the electronic device (200). For example, the third region (230c) may be positioned at a position at least partially overlapping with at least one hinge assembly (240, 240-1) when the first display (230) is viewed from above (e.g., in the +z-axis direction). For example, the first display (230) may be arranged so that it is not visible from the outside in the second state by having the first side (211) and the third side (221) face each other (e.g., inward-fold type). For example, the first display (230) may be arranged so that it is visible from the outside in the second state by having the first side (211) and the third side (221) face each other in opposite directions (e.g., outward-fold type).

[0039] FIG. 2 is an exploded perspective view of a portion of the electronic device of FIGS. 1A and 1B including a hinge device, according to one embodiment.

[0040] Referring to FIG. 2, in one embodiment, an electronic device (e.g., the electronic device (200) of FIG. 1A) may include at least one hinge assembly (240, 240-1) (e.g., a hinge structure, a hinge module, or a hinge device) connecting a first housing (210) and a second housing (220) below a first display (230) (e.g., in the −z-axis direction). For example, the at least one hinge assembly (240, 240-1) may include a first hinge assembly (240) and a second hinge assembly (240-1) spaced apart from the first hinge assembly (240) along a direction parallel to the folding axis (F) (e.g., in the ±y-axis direction). For example, at least one hinge assembly (240, 240-1) may be positioned between the first housing (210) and the second housing (220) so as to be invisible from the outside through a hinge housing (250) (e.g., a hinge cover).

[0041] When the electronic device (200) is in a folded state, the folding area (e.g., the third area (230c) of FIG. 1A) (e.g., the folding area) of the first display (230) can be formed into a water drop shape (e.g., a dumbbell shape) due to gravity, thereby securing a folding curvature that prevents cracks or buckling from occurring in the folding area of ​​the first display (230). In addition, by arranging the dumbbell-shaped display folding area within a certain space of the housings (210, 220), the gap between the housings (210, 220) that are arranged to face each other and have an 11-shaped arrangement state when the electronic device (200) is in a folded state can be reduced. Through this, the electronic device (200) can reduce the overall size of the electronic device (200) by reducing the gap between the housings (210, 220) in the folded state, and can block or reduce the inflow of foreign substances between the housings (210, 220).

[0042] According to one embodiment, the electronic device may include at least one center bar (243) disposed between the display (230) and the hinge assembly (240, 240-1). The center bar (243) may be disposed to cover at least a portion of a central region of at least one of the first hinge assembly (240) and the second hinge assembly (240-1). As an example, the center bar (243) may be disposed to cover at least a portion of a central region of each of the first hinge assembly (240) and the second hinge assembly (240-1). The center bar (243) may be fastened and fixed to the hinge housing (250) and at least one of the hinge assemblies (240, 240-1).

[0043] The wing plates (261, 262) are arranged to be combined with at least one hinge assembly (240, 240-1) and cover at least a portion of a surface in the +z-axis direction of at least one hinge assembly (240, 240-1) when the electronic device (200) is in an unfolded state. The wing plates (261, 262) are provided in a form separate from the housings (210, 220). Accordingly, a gap can be formed between the wing plates (261, 262) and the housings (210, 220). The wing plates (261, 262) can be arranged on both sides with the center bar (243) therebetween. For example, the first wing plate (261) may be positioned in the +x-axis direction with respect to the center bar (243), and the second wing plate (262) may be positioned in the -x-axis direction with respect to the center bar (243). The wing plates (261, 262) may be positioned at the same height as the center bar (243) or on the same xy plane with respect to the z-axis when coupled with the hinge assembly (240, 240-1). The wing plates (261, 262) may rotate clockwise or counterclockwise depending on the hinge operation of at least one hinge assembly (240, 240-1). For example, while the first wing plate (261) rotates counterclockwise, the second wing plate (262) may rotate clockwise, and while the first wing plate (261) rotates clockwise, the second wing plate (262) may rotate counterclockwise. The first wing plate (261) can support a flat first surface of the third region (230c) of the first display (230) that folds into a dumbbell shape (e.g., a water drop shape with gravity applied), and the second wing plate (262) can support a flat second surface (e.g., a surface symmetrical with respect to the first surface with respect to the z-axis) of the third region (230c) of the first display (230) that folds into a dumbbell shape.

[0044] FIG. 3A is a perspective view illustrating an example of a hinge assembly of an electronic device according to one embodiment.

[0045] FIG. 3b is a drawing showing an example of a combined configuration of a hinge assembly and a hinge housing of an electronic device according to one embodiment.

[0046] FIG. 4 is a plan view illustrating an example of a hinge assembly of an electronic device according to one embodiment.

[0047] FIG. 5 is an exploded perspective view illustrating an example of a hinge assembly of an electronic device according to one embodiment.

[0048] For convenience of explanation, in FIGS. 3A to 5, the first hinge assembly (240) among the hinge assemblies (e.g., the hinge assemblies (240, 240-1) of FIG. 2) will be described. The second hinge assembly (240-1) may include a structure and configuration substantially identical to or similar to those of the first hinge assembly (240), and the description provided for the first hinge assembly (240) may be referred to in a substantially identical or similar manner.

[0049] With reference to FIGS. 1 to 5 , in one embodiment, the first hinge assembly (240) may include a fixed bracket (530) (e.g., a center bracket), a first rotational member (510) (e.g., a first rotational structure or a first rotational body), a second rotational member (520) (e.g., a second rotational structure or a second rotational body), a first link member (310) (e.g., a first slide link, a first rotational support structure, or a first arm link member), a second link member (320) (e.g., a second slide link, a second rotational support structure, or a first rotational link member), a first arm member (410) (e.g., a first arm structure or a first arm), and a second arm member (420) (e.g., a second arm structure or a second arm).

[0050] According to one embodiment, at least one of the components included in the first hinge assembly (240) may be omitted. For example, if the first rotation member (510) and the second rotation member (520) are directly coupled to the housings (210, 220), and the arm members (410, 420) are coupled to the rotation members (510, 520) and rotate in response to the rotation of the rotation members (510, 520), the first link member (310) and the second link member (320) may be omitted.

[0051] The first hinge assembly (240) may include a plurality of shafts (131, 132, 133, 134), at least one cam member (560, 570) (e.g., a cam structure), a first main gear (171), a second main gear (172), at least one linkage gear (1731, 1732), at least one shaft bracket (270, 650) (e.g., a shaft fixing member), at least one gear bracket (610, 630) (e.g., a gear fixing member), a first elastic assembly (110) (e.g., an upper elastic member), a second elastic assembly (120) (e.g., a lower elastic member), a support bracket (800) (e.g., an alignment bracket), a plurality of coupling members (661, 662) (e.g., fixing clips or e-rings), and a fixing member (670) (e.g., an e-ring).

[0052] At least some of the components of the first hinge assembly (240) described above may be formed of a metal material to provide a certain level of rigidity. Alternatively, if necessary, the first hinge assembly (240) may be formed of a reinforced plastic or synthetic resin material. According to one embodiment, at least some of the components of the first hinge assembly (240) described above may be omitted or modified. For example, at least some of the components of the connecting members (661, 662) may be omitted. Alternatively, a specific structure or component of the first hinge assembly (240) may be integrated or combined with another structure or component.

[0053] According to one embodiment, a first hinge assembly (240) may include an anti-flow structure (601) (e.g., a force transmission structure or a fixed structure) configured to maintain contact between the first cam member (560) and the interlocking gears (173). For example, the anti-flow structure (601) may be configured to move organically with other components of the first hinge assembly (240). As an example, the anti-flow structure (601) may include a second gear bracket (630) and a second shaft bracket (650) that are at least partially coupled with the third shaft (133) and the fourth shaft (134).

[0054] As an example of a flow-preventing operation, the first-third elastic member (113) into which a part of the third shaft (133) is inserted and the first-fourth elastic member (114) into which a part of the fourth shaft (134) is inserted are supported by the support bracket (800) and push the first cam member (560) in the -y-axis direction, so that the third cam structure (e.g., the third cam structure (1791) of FIG. 13) and the fourth cam structure (e.g., the fourth cam structure (1792) of FIG. 13) formed on the interlocking gears (173) can be maintained in close contact with the first cam member (560) even while the interlocking gears (173) perform gear operation (e.g., rotational operation). In the above operation, the second gear bracket (630) can be brought into contact with the opposite surface of the surface that contacts the first cam member (560) of the interlocking gears (173) to help maintain the contact state between the cam structures (1791, 1792) of the interlocking gears (173) and the first cam member (560).

[0055] As an example of a flow-preventing operation, the second-third elastic member (123) into which a part of the third shaft (133) is inserted and the second-fourth elastic member (124) into which a part of the fourth shaft (134) is inserted are supported by the second cam member (570) disposed at the lower portion (e.g., +y-axis) of the support bracket (800) and push the second shaft bracket (650) in the +y-axis direction, so that the second gear bracket (630) coupled to the third shaft (133) and the fourth shaft (134) can move in the +y-axis direction. Accordingly, even while the interlocking gears (173) are performing a gear operation (e.g., a rotational operation), the third cam structure (1791) and the fourth cam structure (1792) formed on the interlocking gears (173) can be maintained in close contact with the first cam member (560). In the above operation, the second shaft bracket (650) can assist in maintaining the contact state between the cam structures (1791, 1792) of the interlocking gears (173) and the first cam member (560) by contacting the opposite surface of the surface that contacts the second cam member (570) of the second-third elastic member (123) and the second-fourth elastic member (124). Hereinafter, the respective components for preventing the above-described flow and the peripheral components that contact or are coupled therewith will be described.

[0056] The fixed bracket (530) may include a bracket body (533), a first rail (531) (e.g., a first fixed rail), and a second rail (532) (e.g., a second fixed rail). Grooves may be formed on one side (e.g., a side wall facing the +y-axis direction) of the bracket body (533) to allow one edge (e.g., a -y-axis edge) of at least one of the first outer shaft (131) (e.g., a first shaft), the second outer shaft (132) (e.g., a second shaft), the first inner shaft (133) (e.g., a third shaft), and the second inner shaft (e.g., a fourth shaft) (134) to be mounted. Grooves may be formed on one side (e.g., a side wall facing the +y-axis direction) of the bracket body (533) to allow at least one linkage gear (1731, 1732) to be mounted.

[0057] The fixed bracket (530) may be at least partially secured and fixed to one side of the hinge housing (250). For example, the fixed bracket (530) may be fixed to the -y-axis edge or the +y-axis edge of the hinge housing (250). For example, the fixed bracket (530) may include at least one hole (534, 535, 536) formed through the fixed bracket (530) so as to be fixed to the hinge housing (250). For example, a fastening member (e.g., a screw) may be inserted into a pair of holes (534, 535) formed adjacent to the -y-axis edge of the fixed bracket (530) so that the fixed bracket (530) and the hinge housing (250) may be at least partially coupled. For example, a fastening member may be inserted into a hole (536) formed adjacent to the +y-axis edge of the fixed bracket (530) so that the fixed bracket (530) and the hinge housing (250) may be at least partially coupled. The fixed bracket (530) may include a structure (e.g., a first rail (531) and a second rail (532)) to which a part of the first rotation member (510) (e.g., a first rail structure (511)) and a part of the second rotation member (520) (e.g., a third rail structure (521)) may be rotatably fastened.

[0058] The first rail (531) of the fixed bracket (530) may be formed with a structure corresponding to the first rail structure (511) of the first rotation member (510), and the second rail (532) may be formed with a structure corresponding to the third rail structure (521) of the second rotation member (520). For example, the first rail (531) and / or the second rail (532) may include a cross-section in which at least a portion is formed in an arc shape or a crescent shape from the upper surface (e.g., the surface facing the +z-axis) of the fixed bracket (530) toward the lower surface (e.g., the surface facing the -z-axis).

[0059] The first rail (531) of the fixed bracket (530) may be arranged to be offset in the +x-axis direction from the second rail (532) with respect to the first axis (101) and the second axis (102), and the second rail (532) may be arranged to be offset in the -x-axis direction from the first rail (531) with respect to the first axis (101) and the second axis (102).

[0060] According to one embodiment, the first axis (101) and the second axis (102) may be formed to be spaced apart by a specified interval. According to one embodiment, the interval between the first axis (101) and the second axis (102) may be formed smaller than the interval between the first outer shaft (131) and the second outer shaft (132). According to one embodiment, the first axis (101) and the second axis (102) may be formed higher than the first outer shaft (131) and the second outer shaft (132) based on the z-axis. Alternatively, the first axis (101) and the second axis (102) may be formed closer to the first display (230) than the first outer shaft (131) and the second outer shaft (132) based on the z-axis.

[0061] The first rotating member (510) may include a first rotating body (513), a first rail structure (511) extending from one end of the first rotating body (513) (e.g., an end in the -x-axis direction), and a second rail structure (512) extending from the other end of the first rotating body (513) (e.g., an end in the +x-axis direction). The first rotating body (513) may be disposed between the first rail structure (511) and the second rail structure (512) in the form of a rail. At least a portion of the first rotating body (513) may be fastened to a fixed bracket (530). The first rail structure (511) and the second rail structure (512) may be formed in steps with the first rotating body (513) as the center.

[0062] The first rail structure (511) of the first rotation member (510) can be fastened to one side of the fixed bracket (530) (e.g., the first rail (531)) so as to be hinged. The second rail structure (512) of the first rotation member (510) can be fastened to one side of the first link member (310) to perform a sliding motion (e.g., a rotating motion or an arcing motion) in response to the hinge motion (e.g., a rotating motion or a sliding motion) of the first rail structure (511). While the first link member (310) coupled to the first housing (210) moves in accordance with the movement of the first housing (210), the first rail structure (511) of the first rotation member (510) fastened to the fixed bracket (530) can perform a rotational motion in place based on the first axis (101). For example, the second rail structure (512) of the first rotational member (510) can rotate (e.g., slide) within the first link member (310) while moving in one direction (e.g., counterclockwise while the electronic device (200) is folded from an unfolded state or clockwise while the electronic device (200) is unfolded from a folded state). At least a portion of the first wing plate (261) among the wing plates (261, 262) can be fixed to the first rotational member (510). In this regard, the first rotational member (510) can include at least one hole or groove used to couple with the first wing plate (261). In one example, the first rotational member (510) can include a hole (515) into which the first shaft member (301) is inserted so as to be coupled with the first wing plate (261). The first link member (310) may include rail wings having a hollow space formed in the center and curved surfaces arranged on both sides.

[0063] According to one embodiment, the second rotating member (520) may include a second rotating body (523), a third rail structure (521) extending to the other end of the second rotating body (523) (e.g., the end in the +x-axis direction), and a fourth rail structure (522) extending to one end of the second rotating body (523) (e.g., the end in the -x-axis direction). The second rotating body (523) may be disposed between the third rail structure (521) and the fourth rail structure (522) in the form of a rail. At least a portion of the second rotating body (523) may be fastened to the fixed bracket (530). The third rail structure (521) and the fourth rail structure (522) may be formed to be stepped about the second rotating body (523). In one example, the second rotating member (520) may include a hole (525) into which the second shaft member (302) is inserted so that it can be coupled with the second wing plate (262).

[0064] The third rail structure (521) may be fastened to the other side of the fixed bracket (530) (e.g., the second rail (532)) so as to enable hinge movement. The third rail structure (521) may rotate in place about the second axis (102) while the second link member (320) coupled to the second housing (220) moves according to the movement of the second housing (220). According to one embodiment, the third rail structure (521) may include a rail structure similar or identical to the first rail structure (511).

[0065] The fourth rail structure (522) may be coupled to the second link member (320). The fourth rail structure (522) may rotate (e.g., slide) within the second link member (320) while moving in one direction (e.g., clockwise while the electronic device (200) is folded from an unfolded state or counterclockwise while the electronic device (200) is unfolded from a folded state). In this regard, the second link member (320) may include rail wings having a hollow space formed in the center and curved surfaces arranged on both sides, similar to the first link member (310). In one embodiment, the fourth rail structure (522) may include a rail structure similar or identical to the second rail structure (512).

[0066] The second rotation member (520) can move in a direction opposite to the direction of movement of the first rotation member (510). For example, while the first rail structure (511) of the first rotation member (510) rotates in place in a counterclockwise direction, the third rail structure (521) of the second rotation member (520) can rotate in place in a clockwise direction.

[0067] While the electronic device (200) is folded, the first rail structure (511) of the first rotating member (510) rotates counterclockwise, and the first link member (310) inserted into the second rail structure (512) can slide clockwise along the second rail structure (512). The sliding motion is relative, so the first link member (310) can slide clockwise with respect to the second rail structure (512).

[0068] While the electronic device (200) is folded, the third rail structure (521) of the second rotation member (520) can rotate clockwise along the second rail (532) of the fixed bracket (530), and the second link member (320) inserted into the fourth rail structure (522) can slide counterclockwise. The second link member (320) can slide counterclockwise with respect to the fourth rail structure (522).

[0069] According to one embodiment, the first link member (310) may include a structure that is coupled and fixed to one side of the first housing (210). The first link member (310) may include a third rail (311) on which a part of the first rotation member (510) (e.g., the second rail structure (512)) is mounted. The first link member (310) may include a first slide mounting portion (312) on which a first slide portion (413) of the first arm member (410) is mounted. The first link member (310) may be formed such that a width in the y-axis direction is longer than a width in the x-axis direction to accommodate the third rail (311) and the first slide mounting portion (312). The first link body (313) of the first link member (310) may be fixed to the first housing (210). The third rail (311) may be arranged in one direction (e.g., -y-axis direction) of the first link body (313). The first slide mounting portion (312) may be arranged in the other direction (e.g., +y-axis direction) of the first link body (313). The first slide portion (413) of the first arm member (410) may be mounted on the first slide mounting portion (312) to guide the sliding motion of the first slide portion (413).

[0070] According to one embodiment, the second link member (320) may include a structure that is coupled and fixed to one side of the second housing (220). The second link member (320) may include a fourth rail (321) on which a portion of the second rotation member (520) (e.g., the fourth rail structure (522)) is mounted. The second link member (320) may include a second slide mounting portion (322) on which a second slide portion (423) of the second arm member (420) is mounted. The second link member (320) may be formed such that a width in the y-axis direction is longer than a width in the x-axis direction to accommodate the fourth rail (321) and the second slide mounting portion (322). The second link body (323) of the second link member (320) may be fixed to the second housing (220). The fourth rail (321) may be arranged in one direction (e.g., -y-axis direction) of the second link body (323). The second slide mounting portion (322) may be arranged in the other direction (e.g., +y-axis direction) of the second link body (323). The second slide portion (423) of the second arm member (420) may be mounted on the second slide mounting portion (322) to guide the sliding motion of the second slide portion (423).

[0071] According to one embodiment, the first arm member (410) may be arranged symmetrically with the second arm member (420) with respect to the y-axis. The first arm member (410) may rotate from the +z-axis to the +x-axis direction or from the +x-axis direction to the +z-axis direction. The first arm member (410) may include a first arm body (414), a first slide portion (413), a first arm portion (411), and a second arm portion (412). The first arm body (414) may be arranged between the first arm portion (411) and the second arm portion (412). The first arm portion (411) may be formed to extend from the first arm body (414) in the -x-axis direction, and may include a through hole through which the first outer shaft (131) may pass. A cam structure that performs a cam operation by coming into contact with one side of a cam member (560, 570) (e.g., a cam portion arranged in the -y-axis direction) may be provided in the peripheral structure forming the through hole. The cam structure of the first arm portion (411) may be formed on a surface facing the second cam member (570) (e.g., a surface of the first arm portion (411) in the +y-axis direction). The second arm portion (412) may be formed to extend from the first arm body (414) in the -x-axis direction and may be arranged to be spaced apart from the first arm portion (411) in the -y-axis direction. The second arm portion (412) may include a through hole through which the first outer shaft (131) may pass. The through hole included in the second arm portion (412) and the through hole included in the first arm portion (411) may be connected to each other. A cam structure that performs a cam operation by coming into contact with one side of the first cam member (560) (e.g., a cam member arranged in the -y-axis direction) may be provided in the peripheral structure forming the through hole of the second arm portion (412). The cam structure of the second arm portion (412) may be formed on a surface facing the first cam member (560) (e.g., a surface in the +y-axis direction of the second arm portion (412). The first slide portion (413) may be formed to extend in the +x-axis direction from the first arm body (414).The first slide portion (413) is fastened to the first link member (310) and can perform a sliding motion along the rail wings formed on the first slide mounting portion (312) while the electronic device (200) performs a hinge motion. The first slide portion (413) can include rail grooves that can be fastened to the rail wings formed on the first slide mounting portion (312) of the first link member (310).

[0072] According to one embodiment, the second arm member (420) may be arranged symmetrically with respect to the first arm member (410) with respect to the y-axis. The second arm member (420) may rotate from the +z-axis to the -x-axis direction or from the -x-axis direction to the +z-axis direction. The second arm member (420) may rotate in a direction opposite to the direction of movement of the first arm member (410). The second arm member (420) may include a second arm body (424), a third arm portion (421), a fourth arm portion (422), and a second slide portion (423). The second arm body (424) may be arranged between the third arm portion (421) and the fourth arm portion (422). The third arm portion (421) may be formed to extend from the second arm body (424) in the +x-axis direction, and may include a through hole through which the second outer shaft (132) may pass. A cam structure that performs a cam operation by coming into contact with one side of the second cam member (570) (e.g., a cam member arranged in the -y-axis direction) may be provided in the peripheral structure forming the through hole of the third arm portion (421). The cam structure of the third arm portion (421) may be formed on a surface facing the second cam member (570) (e.g., a surface of the third arm portion (421) in the +y-axis direction). The fourth arm portion (422) may be formed to extend from the second arm body (424) in the +x-axis direction and may be arranged to be spaced apart from the third arm portion (421). The fourth arm portion (422) may include a through hole through which the second outer shaft (132) may pass. The through hole included in the fourth arm portion (422) and the through hole included in the third arm portion (421) may be connected to each other. A cam structure that performs a cam operation by coming into contact with one side of the first cam member (560) (e.g., a cam member positioned in the -y-axis direction) may be provided in the peripheral structure forming the through hole of the fourth arm portion (422). The cam structure of the fourth arm portion (422) may be formed on a surface facing the first cam member (560) (e.g., a surface in the +y-axis direction of the fourth arm portion (422)).The second slide portion (423) may be formed to extend in the -x-axis direction from the second arm body (424). The second slide portion (423) may be fastened to the second link member (320) and may perform a sliding motion along the rail wings formed on the second slide mounting portion (322) while the electronic device (200) performs a hinge motion. The second slide portion (423) may include rail grooves that may be fastened to the rail wings formed on the second slide mounting portion (322) of the second link member (320).

[0073] According to one embodiment, the first outer shaft (131) may have a rod shape in which the length in the y-axis direction is longer than the length in the x-axis or z-axis direction. The first outer shaft (131) may be formed of a metal material so as to support inserted components. For example, the first arm portion (411) of the first arm member (410), the second arm portion (412), the cam member (560, 570), the support bracket (800), at least one washer ring, the first-first elastic member (111), the second-first elastic member (121), the first shaft bracket (270), the first gear bracket (610), and the first coupling member (661) may be inserted into the first outer shaft (131).

[0074] According to one embodiment, the second outer shaft (132) may have the same or similar shape as the first outer shaft (131). For example, the second shaft (132) may have a rod shape in which the length in the y-axis direction is longer than the length in the x-axis or z-axis direction. The second shaft (132) may be formed of a metal material having a strength greater than a specified size so as to support the inserted components. For example, the third arm portion (421), the fourth arm portion (422) of the second arm member (420), the cam member (560, 570), the support bracket (800), at least one washer ring, the first-second elastic member (112), the second-second elastic member (122), the first shaft bracket (270), the first gear bracket (610), and the second coupling member (662) may be inserted into the second shaft (132).

[0075] According to one embodiment, the first inner shaft (133) may have the same or similar shape as the first outer shaft (131). For example, the first inner shaft (133) may have a rod shape in which the length in the y-axis direction is longer than the length in the x-axis or z-axis direction. For example, the first inner shaft (133) may have a first linkage gear (1731), a cam member (560, 570), a support bracket (800), at least one washer ring, a first-third elastic member (113), a second-third elastic member (123), a second shaft bracket (650), a first gear bracket (610), a second gear bracket (630), and a fixing member (670) inserted therein.

[0076] According to one embodiment, the second inner shaft (134) may have the same or similar shape as the first inner shaft (133). For example, the second inner shaft (134) may have a rod shape in which the length in the y-axis direction is longer than the length in the x-axis or z-axis direction. The second inner shaft (134) may be formed of a metal material having a strength greater than a specified size so as to support the inserted components. For example, a second linkage gear (1732), a cam member (560, 570), a support bracket (800), at least one washer ring, a first-fourth elastic member (114), a second-fourth elastic member (124), a second shaft bracket (650), a first gear bracket (610), a second gear bracket (630), and a fixing member (670) may be inserted into the second inner shaft (134).

[0077] The first cam member (560) may include a first cam body (565) and at least one first cam portion (e.g., a first-first cam portion (561)). The first cam member (560) may include a plurality of first cam holes in which at least a portion of each of the first outer shaft (131), the second outer shaft (132), the first inner shaft (133), and the second inner shaft (134) is received. Each of the plurality of first cam holes is formed to penetrate in the y-axis direction and may be formed at the center of the first cam portion. At least a portion of each of the first outer shaft (131), the second outer shaft (132), the first inner shaft (133), and the second inner shaft (134) may be inserted into the first cam hole of the first cam member (560) and then received in the first cam hole. The first cam portion may have a cylindrical shape surrounding the first cam hole formed to penetrate in the y-axis direction at the center of the volume. For example, the 1-1 cam portion (561) may be arranged to engage with the 1-2 cam structure (e.g., the 1-2 cam structure (450) of FIG. 7) formed on the 2nd arm portion (412) of the 1-1 arm member (410). The 1-1 cam portion (561) may have a mountain portion formed in a state of protruding (e.g., in a protruding state) in the -y-axis direction and a valley portion positioned relatively in the +y-axis direction repeatedly arranged. The top of the mountain portion of the 1-1 cam portion (561) may be formed higher than the surroundings (e.g., the valley portion) and may be formed flat in a direction parallel to the x-axis.

[0078] The second cam member (570) may include a second cam body (575) and at least one second cam portion (e.g., a second-first cam portion (571)). The second cam member (570) may include a plurality of second cam holes in which at least a portion of each of the first outer shaft (131), the second outer shaft (132), the first inner shaft (133), and the second inner shaft (134) is received. Each of the plurality of second cam holes is formed to penetrate in the y-axis direction and may be formed at the center of the second cam portion. At least a portion of each of the first outer shaft (131), the second outer shaft (132), the first inner shaft (133), and the second inner shaft (134) may be inserted into the second cam hole of the second cam member (570) and then received in the second cam hole. The second cam portion may have a cylindrical shape surrounding the second cam hole formed to penetrate in the y-axis direction at the center of the volume. For example, the 2-1 cam portion (571) may be arranged to engage with the 1-1 cam structure (e.g., the 1-1 cam structure (440) of FIG. 7) formed on the 1st arm portion (411) of the 1st arm member (410). The 2-1 cam portion (571) may have a mountain portion formed in a state of protruding (e.g., in a protruding state) in the -y-axis direction and a valley portion positioned relatively to the +y-axis repeatedly arranged. The top of the mountain portion of the 2-1 cam portion (571) may be formed higher than the surroundings (e.g., the valley portion), and may be formed flat in a direction parallel to the x-axis.

[0079] According to one embodiment, the cam member (560, 570) may move backward in one direction (e.g., in the -y-axis direction) in response to the cam structure and cam member (560, 570) of the first arm member (410) and the cam structure and cam member (560, 570) of the second arm member (420) while the first arm member (410) and the second arm member (420) rotate within a certain angular range, and then move in the opposite direction (e.g., in the +y-axis direction) of the one direction by the elasticity of the first elastic assembly (110) and the second elastic assembly (120) when the peaks and valleys of the cams (e.g., the cam structure and the cam portion) engage each other, and then return to the original position.

[0080] According to one embodiment, the first elastic assembly (110) may include a plurality of elastic members (e.g., elastic bodies) having a hollow spring shape at the center. For example, the first elastic assembly (110) may include a first-first elastic member (111) and a first-second elastic member (112) disposed on the outside, and a first-third elastic member (113) and a first-fourth elastic member (114) disposed on the inside. The first elastic assembly (110) may be disposed between the first cam member (560) and the support bracket (800). The first elastic assembly (110) may act to push the first cam member (560) in one direction (e.g., in the -y-axis direction). Alternatively, in one example, the first elastic assembly (110) may exert an elastic force to push the support bracket (800) in a direction toward the female members (410, 420) (e.g., in the +y-axis direction).

[0081] According to one embodiment, the second elastic assembly (120) may include a plurality of elastic members (e.g., elastic bodies) having a hollow spring shape at the center. For example, the second elastic assembly (120) may include a second-first elastic member (121) and a second-second elastic member (122) disposed on the outside, and a second-third elastic member (123) and a second-fourth elastic member (124) disposed on the inside. Since the second elastic assembly (120) is disposed between the second cam member (570) and the first shaft bracket (270), it may act to push the second cam member (570) in one direction.

[0082] According to one embodiment, the elastic force generated by the second elastic assembly (120) may be similar to the elastic force generated by the first elastic assembly (110) within a certain range.

[0083] The first gear bracket (610) may include insertion holes into which the first outer shaft (131), the second outer shaft (132), the first inner shaft (133), and the second inner shaft (134) are inserted. For example, the first gear bracket (610) may include a first insertion hole into which one end of the first outer shaft (131) in the -y-axis direction is inserted, and a second insertion hole into which one end of the second outer shaft (132) in the -y-axis direction is inserted. One side of the first gear bracket (610) (e.g., a side wall in the -y-axis direction) may be fastened to at least a portion of the fixed bracket (530) (e.g., a side wall in the +y-axis direction). The first gear bracket (610) may be formed to accommodate at least a portion of the shafts (131, 132, 133, 134) so ​​that the shafts can be aligned in the axial direction (e.g., in the y-axis direction). At least a portion of the surface facing the +y-axis of the first gear bracket (610) can be in contact with the second gear bracket (630), and the other portion can be in contact with the second arm portion (412) and the fourth arm portion (422).

[0084] The first shaft bracket (270) may include shaft holes into which a plurality of shafts may be mounted and fixed. The first shaft bracket (270) may include a plurality of shaft holes into which the first outer shaft (131) and the second outer shaft (132) are respectively mounted and fixed. The shape of at least one of the plurality of shaft holes may be formed into a cylindrical shape that is identical or similar to a cross-section cut along the xz plane of each of the outer shafts (131, 132). In one example, the first shaft bracket (270) may include a fifth insertion hole into which one end of the first outer shaft (131) in the +y-axis direction is inserted, and a sixth insertion hole into which one end of the second outer shaft (132) in the +y-axis direction is inserted. In one embodiment, at least a portion of the first shaft bracket (270) may be mounted and fixed to one side of the hinge housing (250). For example, the first shaft bracket (270) may be fixed to the -y-axis edge or the +y-axis edge of the hinge housing (250). As an example, the first shaft bracket (270) may be fixed at a position opposite to a position at which the fixing bracket (530) of the hinge housing (250) is fixed. For example, the first shaft bracket (270) may include at least one hole (537) into which a fastening member (e.g., a screw) may be inserted. The fastening member may be inserted into the hole (537) of the first shaft bracket (270) so that the first shaft bracket (270) and the hinge housing (250) may be at least partially coupled.

[0085] According to one embodiment, a first main gear (171) may be arranged on one side of a first outer shaft (131). For example, the first main gear (171) may be arranged in an integrated form with a second arm portion (412) of a first arm member (410). In one embodiment, a second main gear (172) may be arranged on one side of a second outer shaft (132). For example, the second main gear (172) may be arranged in an integrated form with a fourth arm portion (422) of a second arm member (420). At least one linkage gear (1731, 1732) may be arranged between the first main gear (171) and the second main gear (172) to be gear-coupled with the first main gear (171) and the second main gear (172). For example, at least one linkage gear (1731, 1732) may include a first linkage gear (1731) that is gear-engaged with the first main gear (171), and a second linkage gear (1732) that is gear-engaged with the second main gear (172). The linkage gears (173) may be used to share the rotational force of the first outer shaft (131) and the rotational force of the second outer shaft (132). According to one embodiment, the first main gear (171) and the second main gear (172) have been described as having a structure formed on the arm members (410, 420) as an example, but the first main gear (171) and the second main gear (172) may be separated from the arm members (410, 420) and disposed separately.

[0086] The anti-flow structure (601) may be defined as a structure for improving a situation in which the interlocking gears (173) can flow in the space between the first cam member (560) and the first gear bracket (610). Alternatively, the anti-flow structure (601) may be defined as a structure that is coupled to the first inner shaft (133) and the second inner shaft (134) so ​​that contact between the cam structures formed on the interlocking gears (173) and the first cam portion (e.g., the first-first cam portion (561)) of the first cam member (560) can be maintained. As an example, the anti-flow structure (601) may include a second gear bracket (630), a second shaft bracket (650), and a fixing member (670). In addition, the anti-flow structure (601) may contribute to strengthening the contact between the main gears (171, 172) and the first cam member (560) during the process of maintaining contact between the interlocking gears (173) and the first cam member (560). For example, the anti-flow structure (601) may improve or prevent the occurrence of a gap between the gears (171, 172, 173) and the first cam member (560). In one embodiment, noise and / or friction that may be generated when the gears flow within an empty space (e.g., a gap) during the folding and / or unfolding operation of the electronic device (200) may be reduced by the anti-flow structure (601). In addition, unnecessary flow and friction of the gears may be prevented, thereby improving the durability and lifespan of the hinge assembly (e.g., the first hinge assembly (240)).

[0087] The second gear bracket (630) may be arranged on one side (e.g., in the +y-axis direction) of the first gear bracket (610) and may include insertion holes into which the first inner shaft (133) and the second inner shaft (134) are inserted. For example, the second gear bracket (630) may include a third insertion hole (e.g., the third insertion hole (634) of FIG. 8) into which one end of the -y-axis direction of the first inner shaft (133) is inserted and a fourth insertion hole (e.g., the fourth insertion hole (635) of FIG. 8) into which one end of the -y-axis direction of the second inner shaft (134) is inserted. A surface of the second gear bracket (630) facing the -y-axis may be in contact with the first gear bracket (610). A surface of the second gear bracket (630) facing the +y-axis may be in contact with the interlocking gears (173). The second gear bracket (630) can support the interlocking gears (173) in the first direction (e.g., +y-axis direction) so as to maintain contact with the interlocking gears (173) and the first cam portion (e.g., the first-first cam portion (561)) of the first cam member (560).

[0088] The interlocking gears (173) may include a first interlocking gear (1731) coupled to a first inner shaft (133) and a second interlocking gear (1732) coupled to a second inner shaft (134). One end (e.g., an end facing the -y-axis) of the first interlocking gear (1731) and the second interlocking gear (1732) may contact a second gear bracket (630). The other end (e.g., an end facing the +y-axis) of the first interlocking gear (1731) and the second interlocking gear (1732) may contact a first cam member (560). Each of the first interlocking gear (1731) and the second interlocking gear (1732) may include a cam structure arranged to mesh with a first cam portion (e.g., a first-first cam portion (561)) of the first cam member (560). In one embodiment, the interlocking gears (173) can move (e.g., slide) on the inner shafts (133, 134) in accordance with the movement of the first inner shaft (133) and the second inner shaft (134) (e.g., movement in the +y-axis or -y-axis direction). In one embodiment, the interlocking gears (173) may be formed integrally with the first inner shaft (133) and the second inner shaft (134).

[0089] The second shaft bracket (650) may be disposed between the second elastic assembly (120) and the first shaft bracket (270), and may include insertion holes into which the first inner shaft (133) and the second inner shaft (134) are inserted. For example, the second shaft bracket (650) may include a seventh insertion hole (e.g., the seventh insertion hole (654) of FIG. 11) into which one end of the +y-axis direction of the first inner shaft (133) is inserted, and an eighth insertion hole (e.g., the eighth insertion hole (655) of FIG. 11) into which one end of the +y-axis direction of the second inner shaft (134) is inserted. The +y-axis-facing side of the second shaft bracket (650) may be in contact with the first shaft bracket (270), and the -y-axis-facing side may be in contact with the 2-3 elastic member (123) and the 2-4 elastic member (124). The second shaft bracket (650) is at least partially fixed to the inner shafts (133, 134) so ​​as to transmit the elastic force (e.g., restoring force) of the second-third elastic member (123) and the second-fourth elastic member (124) to the inner shafts (133, 134).

[0090] In one embodiment, a first coupling member (661) may be arranged on one side (e.g., a side in the +x-axis direction) of the second shaft bracket (650), and a second coupling member (662) may be arranged on the other side (e.g., a side in the -x-axis direction). The first coupling member (661) and the second coupling member (662) may be penetrated by the first outer shaft (131) and the second outer shaft (132), respectively. The first coupling member (661) and the second coupling member (662) may be fixed by being fastened to the first fixing portion (271) and the second fixing portion (272) formed in the first shaft bracket (270).

[0091] In one embodiment, a fixing member (670) may be disposed between the second shaft bracket (650) and the first shaft bracket (270). The fixing member (670) includes through holes into which the first inner shaft (133) and the second inner shaft (134) are inserted, and may be at least partially fastened to the inner shafts (133, 134) so ​​that a fixed state of the second shaft bracket (650) and the inner shafts (133, 134) can be maintained. In one embodiment, the fixing member (670) may be disposed between a portion (e.g., the first fixing portion (271)) that is connected by the first outer shaft (131) of the first shaft bracket (270) through and through and a portion (e.g., the second fixing portion (272)) that is connected by the second outer shaft (132) through and through. The fixed member (670) may be, for example, in the form of an E-ring.

[0092] In one embodiment, by applying the anti-flow structure (601) to the hinge assembly (e.g., the first hinge assembly (240)), the contact of the cam structures of the first cam parts (e.g., the first cam parts (561, 562, 563, 564) of the first cam member (560) and the gears (e.g., the linkage gears (173) and the main gears (171, 172)) can be maintained at all times. For example, the elastic force generated from the second elastic assembly (120) can be transmitted to the first inner shaft (133) and the second inner shaft (134) through the second shaft bracket (650). The inner shafts (133, 134) can be moved in the +y-axis or -y-axis direction by the elastic force transmitted to the first cam A state in which the cam structures of the parts (561, 562, 563, 564) and the gears (171, 172, 173) are all in contact can be implemented.

[0093] As described above, by applying the anti-flow structure (601) to at least one hinge assembly (240, 240-1) of the electronic device (200) according to one embodiment disclosed in the present document, the frictional force provided during the folding and / or unfolding process of the electronic device (200) can be increased. For example, the anti-flow structure (601) can be configured to prevent frictional force loss due to dimensional deviation of at least some of the gears (171, 172, 173). For example, the anti-flow structure (601) can be configured to move in a direction in which contact between the first cam portions (561, 562, 563, 564) of the first cam member (560) and the cam structures of the gears is maintained. As the contact is constantly maintained, frictional force loss due to a gap between the first cam portions and the cam structures, which may be caused by the dimensional deviation, can be prevented. In one example, even if a positive dimensional deviation (e.g., a gear dimension is greater than a specified value) or a negative dimensional deviation (e.g., a gear dimension is less than a specified value) of the gears occurs, the deviation of the frictional force can be maintained constant. For example, by pressurizing the flow-preventing structure (601) and maintaining the contact state between the gears and the first cam member (560) according to the pressurization, even if a dimensional deviation occurs in each of the gears (171, 172, 173), the deviation of the frictional force between each of the gears (171, 172, 173) and the first cam member (560) can be maintained constant. In one embodiment, the anti-friction structure (601) may contribute to the hinge assembly (e.g., the first hinge assembly (240)) providing a constant level of friction so that the electronic device (200) stably maintains a specified folding angle (e.g., 15 degrees, 30 degrees, 45 degrees, 60 degrees, 75 degrees, 90 degrees, 105 degrees, 120 degrees, 135 degrees, 150 degrees, 165 degrees). By utilizing the constant level of friction, various usage environments (e.g., flex mode) that can be implemented at the specified folding angle can be stably provided.

[0094] In one embodiment, the coupling structure of each component of the hinge assembly (e.g., the first hinge assembly (240)) is not limited to the above-described content, and may be formed in various coupling structures. For example, the structure of the rail protrusion (e.g., rail, or rail structure) protruding from one surface of the first hinge assembly (240) and the structure of the rail groove engraved (e.g., sunken) from one surface may be formed in opposite directions. For example, the rail protrusion formed in the first rotating member (510) in a protruding shape may be changed into a rail fixing groove in a engraved shape, and correspondingly, the first rail fixing groove (e.g., the first rail groove, or the first groove) of the fixing bracket (530) coupled with the first rotating member (510) may be changed into a rail protrusion having a protruding structure. This structural change can be applied equally or similarly to the combination of at least two of the second rotating member (520), the fixed bracket (530), the first arm member (410), the second arm member (420), the first link member (310), and the second link member (320).

[0095] In one embodiment, the structure fixed to the hinge housing (250) of the hinge assembly (e.g., the first hinge assembly (240)) is not limited to the above-described content and may be formed in various structures. For example, a part of the fixed bracket (530) or the first shaft bracket (270) may be formed integrally with the hinge housing (250). In addition, for example, the number and shape of the holes (534, 535, 536, 537) formed in the fixed bracket (530) and the first shaft bracket (270) may be modified to ensure stable operation of the first hinge assembly (240). For example, the number and / or shape of the holes may increase or decrease depending on the size of the first hinge assembly (240).

[0096] FIG. 6 is a cross-sectional view illustrating an example of a hinge assembly including a flow-preventing structure according to one embodiment. FIG. 6 illustrates a cross-section of a first hinge assembly (e.g., the first hinge assembly (240) of FIG. 2) including a flow-preventing structure (601) taken along the xy plane.

[0097] Referring to FIGS. 3A through 6, in one embodiment, the first hinge assembly (240) may be configured to generate a frictional force (e.g., a resistance force, a detent force, or a flex force) that maintains a folded state of the electronic device (e.g., the electronic device (200) of FIG. 1A) at a specified angle. For example, the first frictional force may be generated between the first cam member (560) and the second arm portion (412) of the first arm member (410), the fourth arm portion (422) of the second arm member (420), and the interlocking gears (173). For example, when an external force is applied to the electronic device (200) in a folding direction (e.g., a direction in which the angle formed by the first surface (211) of the first housing (210) and the third surface (221) of the second housing (220) of FIG. 1A decreases), a first frictional force in a direction opposite to the rotational direction may be generated at the contact surfaces of the first-second cam structure (450) formed on the second arm portion (412) and the second-second cam structure (470) formed on the fourth arm portion (422) and the first cam portion of the first cam member (560) (e.g., the first-first cam portion (561)) according to the rotation of the first arm member (410) and the second arm member (420). In one embodiment, a cam structure that meshes with the first cam portion of the first cam member (560) may also be formed on the interlocking gears (173) to increase the first frictional force. For example, each of the first linkage gear (1731) that rotates in conjunction with the rotation of the first main gear (171) formed on the first arm member (410) and the second linkage gear (1732) that rotates in conjunction with the rotation of the second main gear (172) may include a cam structure. An additional first frictional force in a direction opposite to the rotational direction may be generated at the contact surfaces of the cam structures of the linkage gears (173) and the first cam portion of the first cam member (560).

[0098] A second frictional force may be generated between the second cam member (570) and the first arm portion (411) of the first arm member (410) and the third arm portion (421) of the second arm member (420). For example, when the external force is applied to the electronic device (200), a second frictional force in a direction opposite to the rotational direction may be generated at the contact surfaces of the 1-1 cam structure (440) formed on the first arm portion (411) and the 2-1 cam structure (460) formed on the third arm portion (421) and the second cam portion (e.g., the 2-1 cam portion (571)) of the second cam member (570) according to the rotation of the first arm member (410) and the second arm member (420). In order to uniformly maintain the first frictional force and the second frictional force of the first hinge assembly (240), the first hinge assembly (240) may further include a flow-preventing structure (601). For example, the flow prevention structure (601) may be configured so that the first inner shaft (133) and the second inner shaft (134) can move in the +y-axis or -y-axis direction within a range in which the first frictional force and the second frictional force can be maintained. For example, the end of the first inner shaft (133) in the -y-axis direction and the end of the second inner shaft (134) in the -y-axis direction may be inserted into a second gear bracket (630), and the end of the first inner shaft (133) in the +y-axis direction and the end of the second inner shaft (134) in the +y-axis direction may be inserted into a second shaft bracket (650) and fixed by a fixing member (670). Since the second gear bracket (630), the second shaft bracket (650), and the fixing member (670) are formed separately from the components that are fastened to the first outer shaft (131) and the second outer shaft (132), the first inner shaft (133), the second inner shaft (134), and the movement prevention structure (601) fastened to the inner shafts (133, 134) can move in the +y-axis or -y-axis direction with respect to the first outer shaft (131) and the second outer shaft (132).

[0099] For example, the second gear bracket (630) may be formed separately from a portion (e.g., 621 in FIG. 13) that is fastened to an end of the first outer shaft (131) in the -y-axis direction and a portion (e.g., 622 in FIG. 13) that is fastened to an end of the second outer shaft (132) in the -y-axis direction. For example, the second shaft bracket (650) may be formed separately from a first coupling member (661) that is fastened to an end of the first outer shaft (131) in the +y-axis direction and a second coupling member (662) that is fastened to an end of the second outer shaft (132) in the +y-axis direction. For example, the fixed member (670) can be formed separately from a first fixed portion (271) to which the end in the +y-axis direction of the first outer shaft (131) is fixed and a second fixed portion (272) to which the end in the +y-axis direction of the second outer shaft (132) is fixed.

[0100] In one embodiment, the second gear bracket (630) may be coupled to the first mounting portion formed on the inner shafts (133, 134). By coupling the second gear bracket (630) to the first mounting portion, even if the inner shafts (133, 134) move in the -y-axis direction, the interlocking gears (173) may not slip in the -y-axis direction. In one embodiment, the second shaft bracket (650) may be coupled to the second mounting portion formed on the inner shafts (133, 134). By combining the second shaft bracket (650) with the second mounting portion, the second-third elastic member (123) and the second-fourth elastic member (124) can be compressed, and an elastic force in the +y-axis direction can be transmitted from the elastic members (123, 124) to the second shaft bracket (650). FIG. 7 is a drawing showing an example of a first arm member according to one embodiment.

[0101] Reference number of Fig. 7 <701> The first cancer member (410) is shown as viewed obliquely to the +y-axis, and reference number <702> It shows the first cancer member (410) viewed obliquely along the -y axis.

[0102] Referring to FIGS. 3A to 7, in one embodiment, the first arm member (410) may include a first arm body (414), a first arm portion (411), a second arm portion (412), and a first slide portion (413). The first arm body (414) may be positioned between each of the first arm portion (411) and the second arm portion (412) and the first slide portion (413). The first arm body (414) may connect the first arm portion (411) and the first slide portion (413), and may connect the second arm portion (412) and the first slide portion (413).

[0103] The first arm body (414) can transmit the force of the first slide portion (413) sliding (e.g., arc motion) on the first link member (310) during the folding or unfolding process of the electronic device (200) to the first arm portion (411) and the second arm portion (412). Alternatively, the first arm body (414) can transmit the rotational force of the first arm portion (411) and the second arm portion (412) to the first slide portion (413) while the first arm portion (411) and the second arm portion (412) rotate according to the rotation of the first outer shaft (131).

[0104] The first female portion (411) may include a first female surface (431) facing in one direction (e.g., the -y-axis direction), a second female surface (432) facing in an opposite direction to the first female surface (431), and a first outer peripheral surface (435) disposed between the first female surface (431) and the second female surface (432). For example, at least a portion of the first female portion (411) may be formed as a hollow cylinder.

[0105] The first arm portion (411) may include a first arm hole (441) formed to penetrate the first arm surface (431) and the second arm surface (432). The first arm portion (411) may be formed in a ring shape surrounding the first arm hole (441). The first arm hole (441) may have a diameter similar to that of the first outer shaft (131) so that the first outer shaft (131) may be inserted therein. The first arm hole (441) may be formed in a shape corresponding to the outer diameter of the first outer shaft (131). A cross-sectional shape of the first arm hole (441) taken along the xy plane may correspond to a shape of a cross-sectional shape of the first outer shaft (131) taken along the xy plane. For example, when the cross-sectional shape of the first arm hole (441) cut along the xy plane is circular, the cross-sectional shape of the first outer shaft (131) cut along the xy plane may be circular. In one example, the first arm hole (441) of the first arm portion (411) may be in communication with the second arm hole (442) formed in the second arm portion (412). In one example, the centers of the first arm hole (441) and the second arm hole (442) may be formed to be substantially identical to the first axis (101).

[0106] The second cam face (432) may include a first-first cam structure (440) (e.g., a first-first rotation cam structure) arranged to face the second cam member (570). The first-first cam structure (440) may be formed on a surface facing the second cam member (570). The first-first cam structure (440) may have mountains and valleys repeatedly arranged. The mountains of the first-first cam structure (440) may be formed in a positive shape protruding toward the second cam member (570). The valleys of the first-first cam structure (440) may be formed in a concave negative shape.

[0107] The second arm portion (412) may be formed to be spaced apart from the first arm portion (411) in the -y-axis direction. A first main gear (171) formed in a gear pattern may be formed on at least a portion of the outer circumferential surface of the second arm portion (412). The first main gear (171) may be formed in a form in which mountains and valleys are repeated along the periphery of the second circumferential surface (433). The first main gear (171) may be arranged to mesh with the first linkage gear (1731). The surface (434) facing the first arm surface (431) of the second arm portion (412) may include a first-second cam structure (450) arranged to face the first cam member (560). The first-second cam structure (450) may have mountains and valleys repeatedly arranged. The mountain of the first-second cam structure (450) may be formed in a positive shape protruding toward the first cam member (560). The valley of the first-second cam structure (450) may be formed in a concave negative shape. The first-second cam structure (450) may perform a cam operation according to the rotation of the first arm member (410) while being pressed by the first-first elastic member (111) and / or the second-first elastic member (121).

[0108] For example, while the electronic device (200) is folded at a specified angle (e.g., an angle greater than 0 degrees and less than 180 degrees), a protruding portion of the shape of the first-first cam structure (440) can engage with a protruding portion of the second cam member (570), and a protruding portion of the first-second cam structure (450) can engage with a protruding portion of the first cam member (560). While the upper part (e.g., the top part of the mountain) of the first-first cam structure (440) and the upper part (e.g., the top part of the mountain) of the second cam member (570) are in contact, and the upper part (or, the top part of the mountain) of the first-second cam structure (450) and the upper part (or, the top part of the mountain) of the first cam member (560) maintain contact, the amount of compression of the first-first elastic member (111) and / or the second-first elastic member (121) and the amount of compression of the first-second elastic member (112) and / or the second-second elastic member (122) can be maintained at a certain level or greater. The frictional force generated in the surrounding structures (e.g., the cam members (560, 570) or the cam structures (440, 450)) to which the elastic force (e.g., the restoring force) due to the compression of the elastic members is applied can contribute to maintaining the electronic device (200) in a state folded at a specified angle.

[0109] According to one embodiment, the second arm member (420) may be formed in a shape substantially identical to or similar to the first arm member (410). For example, the second arm member (420) may include a second arm body (424), a third arm portion (421), a fourth arm portion (422), and a second slide portion (423). The third arm portion (421) may include a second-first cam structure (460), and the fourth arm portion (422) may include a second-second cam structure (470). The second arm body (424) may correspond to the first arm body (414) of the first arm member (410), the third arm portion (421) may correspond to the first arm portion (411) of the first arm member (410), the fourth arm portion (422) may correspond to the second arm portion (412) of the first arm member (410), and the second slide portion (423) may correspond to the first slide portion (413) of the first arm member (410). The 2-1 cam structure (460) may correspond to the 1-1 cam structure (440), and the 2-2 cam structure (470) may correspond to the 1-2 cam structure (450). Accordingly, the detailed structure of the second arm member (420) may be understood with reference to the description of the detailed structure of the first arm member (410).

[0110] FIG. 8 is a drawing showing an example of a gear bracket included in a flow prevention structure according to one embodiment.

[0111] Reference number of Fig. 8 <801> The second gear bracket (630) is shown as viewed obliquely from the +y axis, and reference number <802> shows the second gear bracket (630) as viewed from the +z axis.

[0112] Referring to FIGS. 6 to 8, in one embodiment, the second gear bracket (630) may be formed with insertion holes (634, 635) so that the first inner shaft (133) and the second inner shaft (134) may pass through them. For example, the second gear bracket (630) may include a third insertion hole (634) and a fourth insertion hole (635) that are formed to pass through from one side facing the interlocking gears (173) (e.g., the side facing the +y-axis) to the opposite side (e.g., the side facing the -y-axis). The first inner shaft (133) may be inserted into the third insertion hole (634), and the third insertion hole surface (6341) may be in contact with the outer surface of the first inner shaft (133). A second inner shaft (134) can be inserted into the fourth insertion hole (635), and the fourth insertion hole surface (6351) can be in contact with the outer surface of the second inner shaft (134).

[0113] At least one surface of the second gear bracket (630) may be formed to correspond to a portion of the shape of the interlocking gears (173). For example, the second gear bracket (630) may include a first central portion (631) and extension portions (632, 633) extending from the first central portion (631) to both sides (e.g., in the +x-axis direction and the -x-axis direction). The first extension portion (632) in which the third insertion hole (634) of the second gear bracket (630) is formed may be in contact with the first interlocking gear (1731), and the second extension portion (633) in which the fourth insertion hole (635) is formed may be in contact with the second interlocking gear (1732). For example, each of the first extension portion (632) and the second extension portion (633) may be formed to be at least partially similar to an upper surface (e.g., a surface facing the -y-axis) of the first linkage gear (1731) and an upper surface (e.g., a surface facing the -y-axis) of the second linkage gear (1732). In one example, corresponding to the width (e.g., a width in the z-axis direction) of the connecting portion of the first linkage gear (1731) and the second linkage gear (1732) being formed to be the smallest, the width (e.g., a width in the z-axis direction) of the first central portion (631) of the second gear bracket (630) may be formed to be smaller than the widths (e.g., a width in the z-axis direction) of the extension portions (632, 633). In one embodiment, one surface facing the +y-axis and one surface facing the -y-axis of the second gear bracket (630) may be formed to be flat.

[0114] In one embodiment, the second gear bracket (630) may be disposed between a coupling member (e.g., the third coupling member (621) of FIG. 13) coupled to the first outer shaft (131) and a coupling member (e.g., the fourth coupling member (622) of FIG. 13) coupled to the second outer shaft (132). The second gear bracket (630) may be spaced apart from the third coupling member (621) in the -x-axis direction by a predetermined distance, and may be spaced apart from the fourth coupling member (622) in the +x-axis direction by a predetermined distance. Alternatively, the second gear bracket (630) may be formed separately on the x-axis so as not to cause friction and / or wear due to contact with the third coupling member (621) and the fourth coupling member (622). For example, the first extension portion (632) of the second gear bracket (630) may be formed so as not to contact the third coupling member (621), and the second extension portion (633) may be formed so as not to contact the fourth coupling member (622). The second gear bracket (630), into which the first inner shaft (133) and the second inner shaft (134) are inserted, is formed separately from the coupling members (621, 622) into which the first outer shaft (131) and the second outer shaft (132) are inserted, so that the inner shafts (133, 134) can move separately from the outer shafts (131, 132).

[0115] FIG. 9 is a drawing showing an example of a linkage gear of a hinge assembly according to one embodiment.

[0116] Reference number of Fig. 9 <901> The first linkage gear (1731) is shown as viewed obliquely in the +y-axis direction, and reference number <902> shows the first linkage gear (1731) viewed obliquely in the -y-axis direction, and reference number <903> shows the first linkage gear (1731) as viewed from the +z-axis direction.

[0117] With reference to FIGS. 6 to 9, in one embodiment, the linkage gears (173) may include gear faces that mesh with the main gears (171, 172) and a third cam structure that contacts the first cam member (560). For example, the first linkage gear (1731) may include a first gear face (1741) that is formed to mesh with the first main gear (171), a face (1751) that contacts the second gear bracket (630), and a third cam structure (1791) that contacts the first cam member (560). The first gear face (1741) may be formed in a form in which mountains (e.g., protruding portions) and valleys (e.g., recessed portions) are repeated along the periphery of the circumference of the first linkage gear (1731). The first gear surface (1741) may be formed to mesh with the second circumferential surface (433) of the second arm portion (412), and the first linkage gear (1731) may rotate in response to the rotation of the first arm member (410). One surface (1751) of the first linkage gear (1731) facing the -y-axis may be formed to have a shape corresponding to one surface of the second gear bracket (630) facing the +y-axis. For example, the one surface (1751) of the first linkage gear (1731) may be formed flat. A first hole (1761) into which a first inner shaft (133) may be inserted may be formed in the one surface (1751) of the first linkage gear (1731). The first hole (1761) may be formed to penetrate the first linkage gear (1731) from the -y-axis to the +y-axis.

[0118] The third cam structure (1791) may be formed on a surface of the first linkage gear (1731) facing the +y-axis. The third cam structure (1791) may include a valley (1771) and a ridge (1781) that protrudes in the +y-axis direction compared to the valley (1771). For example, the third cam structure (1791) may be formed by repeating the valleys (1771) and the ridges (1781). The third cam structure (1791) may be in contact with the first cam portion of the first cam member (560) (e.g., the first-third cam portion (563) of FIG. 10). For example, while the electronic device (e.g., the electronic device (200) of FIG. 1A) is maintained in a folded state at a specified angle, the contact state between the ridge (1781) of the third cam structure (1791) and the third ridge (e.g., the third ridge (553) of FIG. 10) of the first-third cam portion (563) may be maintained. The second linkage gear (1732) may be formed in a shape substantially the same as or similar to that of the first linkage gear (1731), and reference may be made to the description provided with respect to the first linkage gear (1731). For example, the second linkage gear (1732) may include a second gear surface formed to mesh with the second main gear (172), one surface in contact with the second gear bracket (630), and a fourth cam structure (e.g., the fourth cam structure (1792) of FIG. 13) in contact with the first cam member (560). The second gear surface may correspond to the first gear surface (1741) of the first linkage gear (1731), and the fourth cam structure may correspond to the third cam structure (1791) of the first linkage gear (1731).

[0119] FIG. 10 is a drawing showing an example of a cam member of a hinge assembly according to one embodiment.

[0120] Reference number of Fig. 10 <1001> The first cam member (560) is shown as viewed from the +z axis, and reference number <1002> It shows the first cam member (560) viewed obliquely along the -y axis.

[0121] Referring to FIGS. 6 to 10, in one embodiment, the first cam member (560) may include at least one first cam portion formed in a cam shape. For example, the first cam member (560) may include first cam portions having repeatedly formed peaks (e.g., portions protruding in the -y-axis) and valleys (e.g., portions recessed in the +y-axis, or portions formed flat) on one surface (e.g., a surface facing the -y-axis). For example, the first cam member (560) may include a first-first cam portion (561) including a first ridge (551) and a first valley (541), a first-second cam portion (562) including a second ridge (552) and a second valley (542), a first-third cam portion (563) including a third ridge (553) and a third valley (543), and a first-fourth cam portion (564) including a fourth ridge (554) and a fourth valley (544). In one example, a first through hole (566) into which a first outer shaft (131) is inserted may be formed in the 1-1 cam portion (561), a second through hole (567) into which a second outer shaft (132) is inserted may be formed in the 1-2 cam portion (562), a third through hole (568) into which a first inner shaft (133) is inserted may be formed in the 1-3 cam portion (563), and a fourth through hole (569) into which a second inner shaft (134) is inserted may be formed in the 1-4 cam portion (564). In one embodiment, the first cam portions (561, 562, 563, 564) may be at least partially connected to each other and formed integrally.

[0122] The first-first cam portion (561) may be in contact with the first-second cam structure (450) formed on the second arm portion (412) of the first arm member (410). For example, the first peak (551) and the protruding portion of the first-second cam structure (450) may be in contact to generate at least a portion of the first frictional force. The first-second cam portion (562) may be in contact with the second-second cam structure (e.g., the second-second cam structure (470) of FIG. 13) formed on the fourth arm portion (422) of the second arm member (420). For example, the second peak (552) and the protruding portion of the second-second cam structure (470) may be in contact to generate at least a portion of the first frictional force. The first-third cam portion (563) may be in contact with the third cam structure (1791) formed on the first linkage gear (1731). For example, the third floor (553) and the floor (1781) of the third cam structure (1791) may come into contact, thereby generating at least a portion of the first frictional force. The first-fourth cam portion (564) may come into contact with the fourth cam structure formed on the second linkage gear (1732) (e.g., the fourth cam structure (1792) of FIG. 13). For example, the fourth floor (554) and the floor of the fourth cam structure (1792) may come into contact, thereby generating at least a portion of the first frictional force. The first frictional force generated by the contact of the first cam portions (561, 562, 563, 564) of the first cam member (560) with each of the first-second cam structure (450), the second-second cam structure (470), the third cam structure (1791), and the fourth cam structure (1792) can be used to maintain the folding angle of an electronic device (e.g., the electronic device (200) of FIG. 1A). In order to stably maintain a folding state of a specified angle of the electronic device (200), the contact of the first cam portions (561, 562, 563, 564) and the cam structures (e.g., the first cam structure, the second cam structure, and the third cam structure) and the generation of the frictional force resulting therefrom must be constantly maintained.The flow prevention structure (601) allows the first inner shaft (133) and the second inner shaft (134) to move in the +y-axis or -y-axis direction to maintain the above contact and frictional force at all times, and this will be described later in FIGS. 13 to 15.

[0123] In one embodiment, the action of folding or unfolding the electronic device (200) may be related to a cam action (e.g., engagement of cam members (560, 570) and cam structures (440, 450, 460, 470, 1791, 1792)) of a hinge assembly (e.g., a first hinge assembly (240)). For example, the contact area of ​​the first cam portions (561, 562, 563, 564) of the first cam member (560) and the cam structures (450, 470, 1791, 1792) that contact the first cam member (560) may vary depending on the state of the electronic device (200). In one example, in the unfolded state of the electronic device (200), the first cam portions and the cam structures may at least partially contact each other. Alternatively, for example, during the unfolded state of the electronic device (200), the peaks (551, 552, 553, 554) of the first cam portions (e.g., the portions protruding in the -y-axis) and the mountain portions (e.g., the portions protruding in the +y-axis) of the cam structures may be spaced apart by a predetermined distance. In one example, while the electronic device (200) is folded from the unfolded state to a specified first angle (e.g., a specific angle between 0 and 180 degrees), the contact area of ​​the peaks of the first cam portions and the mountain portions of the cam structures may gradually increase, thereby increasing the first frictional force. During the folded state of the electronic device (200) at the first angle, the first frictional force may act as a resistance to a force (e.g., a restoring force) against which the electronic device (200) is to unfold. For example, during the first angle folding state, the contact area and the first frictional force between the peaks of the first cam portions and the mountain portions of the cam structures may be at a maximum. In one example, during the electronic device (200) being completely folded from the specified first angle folding state, the contact area between the peaks of the first cam portions and the mountain portions of the cam structures may be reduced.For example, during the folded state of the electronic device (200), the contact area between the floors of the first cam portions and the mountain portions of the cam structures may be minimal.

[0124] In one embodiment, the grooves (541, 542, 543, 544) of the cam member (560, 570) or the groove portions of the cam structure (440, 450, 460, 470) may be formed to facilitate the unfolding and folding operations of the electronic device (200). For example, in a folding state of the electronic device (200) at a second angle other than the first angle specified above, the ribs of the cam structure may each move along the grooves of the cam member. For example, when a certain level of external force is applied to the electronic device (200) in the folded state of the second angle, the mountain portion (e.g., the portion protruding in the +y axis) of the 1-2 cam structure (450) can move along the first valley (541) of the first cam member (560), and the mountain portion (e.g., the portion protruding in the +y axis) of the 2-2 cam structure (470) can move along the second valley (542) of the first cam member (560). As the mountain portion of the cam structure (440, 450, 460, 470) moves along the valley portion of the cam member (560, 570), the first frictional force or the second frictional force can be reduced, and the state of the electronic device (200) can be changed to an unfolded state or a folded state. As the gap between the cam member (e.g., the first cam member (560)) and the cam structure (e.g., the first-second cam structure (450), the second-second cam structure (470), the third cam structure (1791), the fourth cam structure (1792)) is prevented by the flow-preventing structure (601), the operation of the cam structure can be performed smoothly. For example, when the electronic device (200) unfolds or folds, if the contact state between the mountain portion of the cam structure and the valley portion of the cam member is maintained, the electronic device (200) can be unfolded or folded with a relatively small force. For example, when an external force is applied to the electronic device (200) and the mountain portion of the cam structure and the valley portion of the cam member come into contact, the mountain portion of the cam structure moves from a high portion of the valley portion formed to be curved toward a low portion, thereby allowing the electronic device (200) to be smoothly unfolded or folded.

[0125] FIG. 11 is a drawing showing an example of a shaft bracket included in a flow prevention structure according to one embodiment.

[0126] Reference number of Fig. 11 <1101> The second shaft bracket (650) is shown as viewed obliquely from the +y axis, and reference number <1102> shows the second shaft bracket (650) as viewed from the +z axis.

[0127] Referring to FIGS. 6 to 11, in one embodiment, insertion holes (654, ​​655) may be formed in the second shaft bracket (650) so that the first inner shaft (133) and the second inner shaft (134) may pass through them. For example, the second shaft bracket (650) may include a seventh insertion hole (654) and an eighth insertion hole (655) that are formed to penetrate from one side facing the fixing member (670) (e.g., the side facing the +y-axis) to the opposite side (e.g., the side facing the -y-axis). The first inner shaft (133) may be inserted into the seventh insertion hole (654), and the seventh insertion hole surface (6541) may be in contact with the outer surface of the first inner shaft (133). A second inner shaft (134) can be inserted into the eighth insertion hole (655), and the eighth insertion hole surface (6551) can be in contact with the outer surface of the second inner shaft (134).

[0128] At least one surface of the second shaft bracket (650) may be formed to correspond to a portion of the shape of the second elastic assembly (e.g., the second elastic assembly (120) of FIG. 5). For example, the second shaft bracket (650) may include a second central portion (651) and extension portions (652, 653) extending from the second central portion (651) to both sides (e.g., in the +x-axis direction and the -x-axis direction). The third extension portion (652) in which the seventh insertion hole (654) of the second shaft bracket (650) is formed may be in contact with the 2-3 elastic member (123), and the fourth extension portion (653) in which the eighth insertion hole (655) is formed may be in contact with the 2-4 elastic member (124). For example, each of the third extension portion (652) and the fourth extension portion (653) may be formed to be at least partially similar to the lower surface (e.g., the surface facing the +y-axis) of the second-third elastic member (123) and the lower surface (e.g., the surface facing the +y-axis) of the second-fourth elastic member (124). In one example, corresponding to the width (e.g., the width in the z-axis direction) of the contact portions of the second-third elastic member (123) and the second-fourth elastic member (124) being formed to be the smallest, the width (e.g., the width in the z-axis direction) of the second central portion (651) of the second shaft bracket (650) may be formed to be smaller than the widths (e.g., the width in the z-axis direction) of the extension portions (652, 653). In one embodiment, one surface facing the +y-axis and one surface facing the -y-axis of the second shaft bracket (650) may be formed to be flat.

[0129] The second shaft bracket (650) may be disposed between the coupling members (661, 662). For example, the second shaft bracket (650) may be disposed between the first coupling member (661) coupled to the first outer shaft (131) and the second coupling member (662) coupled to the second outer shaft (132). The second shaft bracket (650) may be spaced apart from the first coupling member (661) in the -x-axis direction by a predetermined distance, and may be spaced apart from the second coupling member (662) in the +x-axis direction by a predetermined distance. Alternatively, the second shaft bracket (650) may be formed separately on the x-axis so as not to cause friction and / or wear due to contact with the first coupling member (661) and the second coupling member (662). For example, the third extension portion (652) of the second shaft bracket (650) may be formed so as not to contact the first coupling member (661), and the fourth extension portion (653) may be formed so as not to contact the second coupling member (662). Since the second shaft bracket (650), into which the first inner shaft (133) and the second inner shaft (134) are inserted, is formed separately from the coupling members (661, 662), into which the first outer shaft (131) and the second outer shaft (132) are inserted, the inner shafts (133, 134) may be moved separately from the outer shafts (131, 132).

[0130] FIG. 12 is a drawing showing an example of a shaft of a hinge assembly according to one embodiment.

[0131] Reference number of Fig. 12 <1201> The first inner shaft (133) is shown as viewed from the +z axis, and reference number <1202> shows an enlarged view of the -y-axis end of the first inner shaft (133), and reference number <1203> shows an enlarged view of the +y-axis end of the first inner shaft (133).

[0132] With reference to FIGS. 6 to 12, in one embodiment, the first inner shaft (133) may include at least one step structure (e.g., an interlocking structure, a fastening structure, a curved structure, or a protruding structure). For example, the first inner shaft (133) may include a first step structure (e.g., a first step portion) on which the second gear bracket (630) is mounted, and a second step structure (e.g., a second step portion) on which the second shaft bracket (650) is mounted. For example, the first inner shaft (1333) may include a rod (1332) extending in a first direction (e.g., a +y-axis direction), a first step portion (1331) formed at one end of the rod (1332) facing the -y-axis, and a second step portion (1333) formed at one end facing the +y-axis.

[0133] At least one surface of the second gear bracket (630) may be supported by the first step portion (1331). For example, the first step portion (1331) may have a diameter larger than the diameter of the rod (1332). The first step portion (1331) may be formed to protrude further than the rod (1332) from the center of the rod (e.g., the center of the first inner shaft (133)). For example, the first step portion (1331) may include a first step surface (1334) that protrudes outward from the rod (1332). The first step surface (1334) may be formed perpendicular to the outer surface of the rod (1332) and may be in contact with a surface of the second gear bracket (630) facing the -y axis. For example, the second gear bracket (630) may be supported on the first step surface (1334) of the first inner shaft (133) when the first inner shaft (133) is inserted. For example, the diameter of the third insertion hole (634) formed in the first extension portion (632) of the second gear bracket (630) may be formed to be larger than the diameter of the rod (1332) and smaller than the diameter of the first step surface (1334). The surface of the first extension portion (632) facing the -y-axis may be in contact with the first step surface (1334). By forming the first step portion (1331), the movement of the second gear bracket (630) on the first inner shaft (133) (e.g., movement in the -y-axis direction) is restricted, and thus the movement of the first linkage gear (1731) in contact with the second gear bracket (630) may be restricted as well. As the movement of the first linkage gear (1731) in the -y-axis direction is restricted, the separation of the first linkage gear (1731) and the first cam member (560) can be prevented.

[0134] At least one surface of the second shaft bracket (650) may be supported on the second step portion (1333). For example, the second step portion (1333) may include a mounting portion (1335) formed to be smaller than the diameter of the rod (1332) and a fixing portion (1336) formed to have a larger diameter than the mounting portion (1335). For example, the mounting portion (1335) may be recessed from the center of the rod (1332) (e.g., the center of the first inner shaft (133)) compared to the rod (1332), and the fixing portion (1336) may be protruded further than the rod (1332). By forming the mounting portion (1335), a second step surface (1337) connected to the mounting portion (1335) may be formed on the first inner shaft (133). A third step surface may be formed on a surface (e.g., a surface facing the -y axis) that is connected to the mounting portion (1335) of the fixed portion (1336). The second step surface (1337) and the third step surface may be formed perpendicular to the outer surface of the mounting portion (1335). The second step surface (1337) may be in contact with a surface of the second shaft bracket (650) facing the -y axis, and the third step surface may be in contact with a surface of the second shaft bracket (650) facing the +y axis. For example, the second shaft bracket (650) may be supported between the second step surface (1337) and the third step surface after the mounting portion (1335) is inserted. For example, the diameter of the seventh insertion hole (654) formed in the third extension portion (652) of the second shaft bracket (650) may be formed to be larger than the diameter of the mounting portion (1335) and smaller than the diameter of the fixing portion (1336). For example, the surface of the third extension portion (652) facing the -y-axis may be in contact with the second step surface (1337), and the surface facing the +y-axis may be in contact with the third step surface. In one embodiment, the second shaft bracket (650) may be formed of an elastic material. For example, the second shaft bracket (650) may be deformed (e.g., tensile) to pass through the mounting portion (1336), and may be restored to a circular shape (e.g., compressed) after passing through the mounting portion (1336) and then fixed to the mounting portion (1335).In one embodiment, the second shaft bracket (650) may be fixed to the first inner shaft (133) via a fixing member (670). For example, the fixing member (670) may be placed on the mounting portion (1335) together with the second shaft bracket (650) to support the second shaft bracket (650) in the -y-axis direction.

[0135] By forming the second step portion (1333), the movement (e.g., movement in the +y-axis direction) of the second shaft bracket (650) on the first inner shaft (133) can be restricted. For example, as the second shaft bracket (650) is fixed to the mounting portion (1335), the elastic force of the second elastic assembly (e.g., the second-third elastic member (123)) can be transmitted to the mounting portion (1335) through the second shaft bracket (650). The elastic force transmitted to the mounting portion (1335) can be transmitted to the first linkage gear (1731) through the second shaft bracket (650) and can act as a driving force for moving the first linkage gear (1731).

[0136] The shapes of the first step portion (1331) and the second step portion (1333) are not limited to those described above, and may be formed in various shapes. For example, the first step portion (1331) or the second step portion (1333) may be formed in a corresponding shape so as to be engaged with the second gear bracket (630) or the second shaft bracket (650). For example, the first step portion (1331) may have a mountain shape, and the second gear bracket (630) may have a valley shape. For example, the first step portion (1331) and the second gear bracket (630) may have an inclined surface (e.g., a slope) that engages with each other. For example, the first step portion (1331) and the second gear bracket (630) may have a connectable protrusion-convex structure. The shape of the second inner shaft (134) may be formed to be substantially the same as or similar to the shape of the first inner shaft (133). The description provided with respect to the first inner shaft (133) may be referred to for the second inner shaft (134), and any duplicate description will be omitted.

[0137] FIG. 13 is a perspective view illustrating a coupling relationship between components of a flow-preventing structure and a hinge assembly according to one embodiment.

[0138] Referring to FIGS. 6 to 13, in one embodiment, the first hinge assembly (240) may include a movement prevention structure (601) configured to maintain contact surfaces of cam structures formed on the first arm member (410) and the second arm member (420), cam structures formed on the first linkage gear (1731) and the second linkage gear (1732), and cam portions formed on the first cam member (560). The movement prevention structure (601) may include a second gear bracket (630), a second shaft bracket (650), and a fixing member (670).

[0139] The first-second cam structure (450) formed on the second arm portion (412) of the first arm member (410), the second-second cam structure (470) formed on the fourth arm portion (422) of the second arm member (420), the third cam structure (1791) of the first linkage gear (1731), and the fourth cam structure (1792) of the second linkage gear (1732) can form a first contact surface (S1) that comes into contact with the first cam member (560). Through the first contact surface (S1), a frictional force can be applied to the hinge assembly (240) in a direction opposite to the rotational direction during the rotation of the first arm member (410) and the second arm member (420). For example, the first contact surface (S1) may include a first contact point between the 1-2 cam structure (450) and the 1-1 cam portion (561), a second contact point between the 2-2 cam structure (470) and the 1-2 cam portion (562), a third contact point between the 3rd cam structure (1791) and the 1-3 cam portion (563), and a fourth contact point between the 4th cam structure (1792) and the 1-4 cam portion (564). At each of the above contact points, a frictional force may be generated by the engagement of the cam shapes.

[0140] In one embodiment, the flow prevention structure (601) can be configured so that the first to fourth contact points (hereinafter, contact points) can be maintained. For example, the second gear bracket (630) can come into contact with the interlocking gears (173) while the contact points are maintained. For example, the second gear bracket (630) can form a second contact surface (S2) with the interlocking gears. For example, the first step surface (1334) of the first inner shaft (133) on which the second gear bracket (630) is mounted can be formed at an appropriate position so that the contact points can be maintained, and the second contact surface (S2) can be formed from the second gear bracket (630) mounted on the first step surface (1334) and the interlocking gears.

[0141] In addition, as an example, the second shaft bracket (650) can be brought into contact with the second-third elastic member (123) and the second-fourth elastic member (124) while the contact points are maintained. As an example, the second shaft bracket (650) can be mounted on the first inner shaft (133) and the second inner shaft (134) so ​​that the second-third elastic member (123) and the second-fourth elastic member (124) maintain a compressed state to a certain level. For example, the second shaft bracket (650) can be fixed to the second inner shaft (134) through a fixing member (670). The second shaft bracket (650) can form a third contact surface (S3) with the second-third elastic member (123) and the second-fourth elastic member (124).

[0142] Preferably, the first linkage gear (1731) or the second linkage gear (1732) may be formed to have substantially the same size as the first main gear of the second arm portion (412) (e.g., the first main gear (171) of FIG. 5) or the second main gear of the fourth arm portion (422) (e.g., the second main gear (172) of FIG. 5). At this time, the second gear bracket (630) may contact the upper surfaces (e.g., surfaces facing the -y axis) (e.g., 1751 of FIG. 9) of the first linkage gear (1731) and the second linkage gear (1732) while the first contact surface (S1) is maintained (e.g., the contact points are maintained) to form a second contact surface (S2). The second contact surface (S2) may form a plane substantially the same as the lower surface (e.g., the surface facing the +y axis) of the third coupling member (621) into which the first outer shaft (131) is inserted or the fourth coupling member (622) into which the second outer shaft (132) is inserted. In addition, the second shaft bracket (650) may form a third contact surface (S3) by contacting the lower surfaces (e.g., the surface facing the +y axis) of the second-third elastic member (123) and the second-fourth elastic member (124) while the first contact surface (S1) and the second contact surface (S2) are maintained. The third contact surface (S3) may form a plane substantially the same as the upper surfaces (e.g., the surface facing the -y axis) of the first coupling member (661) into which the first outer shaft (131) is inserted and the second coupling member (662) into which the second outer shaft (132) is inserted. In FIG. 14 and FIG. 15, the case where the first linkage gear (1731) or the second linkage gear (1732) is formed smaller or larger than the first main gear (171) or the second main gear (172) will be described later.

[0143] In one embodiment, the hinge assembly (240) can include at least one bracket that maintains the alignment of the shafts (131, 132, 133, 134) while the first inner shaft (133) and the second inner shaft (134) move. For example, the hinge assembly (240) can include a first gear bracket (610) that receives at least a portion of the -y-axis-facing ends of the shafts and a first shaft bracket (270) that receives at least a portion of the +y-axis-facing ends of the shafts. In one example, the first gear bracket (610) can be coupled to a portion of a fixed bracket (e.g., the fixed bracket (530) of FIG. 5) and the first shaft bracket (270) can be coupled to a portion of a hinge housing (e.g., the hinge housing (250) of FIG. 2).

[0144] FIG. 14 is a drawing showing an example of a state in which force is transmitted in a first direction to a flow-preventing structure according to one embodiment.

[0145] Reference number of Fig. 14 <1401> The silver gear is formed smaller than the main gear, and the reference number <1402> It shows the first inner shaft (133) and the second inner shaft (134) moving in the +y-axis direction.

[0146] Referring to FIGS. 13 and 14 , in one embodiment, the interlocking gears (173) may be formed smaller than the main gears (e.g., the first main gear (171) and the second main gear (172) of FIG. 5 ). For example, compared to a preferred form of the interlocking gears (173) (e.g., the form of the first interlocking gear (1731) or the second interlocking gear (1732) illustrated in FIG. 13 ) (hereinafter, referred to as a normal state), the interlocking gears (173) may have a negative dimensional deviation (hereinafter, referred to as a negative deviation). For example, the width of the first interlocking gear (1731) in the +y-axis direction may be formed smaller than the width of the first main gear (171) in the +y-axis direction. Due to the negative deviation, the second gear bracket (630) may be spaced apart from the interlocking gears (173) by a first distance (D1) (e.g., a first gap). For example, when the interlocking gears (173) and the first cam member (560) are in contact to form a first contact surface (S1), the second gear bracket (630) may be arranged at a first distance (D1) from the interlocking gears (173) in the -y-axis direction. The interlocking gears (173) may move along the first inner shaft (133) or the second inner shaft (134) in the space between the second gear bracket (630) and the first cam member (560). For example, when the electronic device (e.g., the electronic device (200) of FIG. 1A) is folded and / or unfolded, the interlocking gears (173) may be minutely moved in the +y-axis or the -y-axis according to the rotation of the first arm member (410) and the second arm member (420). Movement of the linkage gears (173) may cause loss of contact between the linkage gears (173) and the first cam member (560). For example, the linkage gears (173) may be moved to contact the second gear bracket (630) and be spaced apart from the first cam member (560) by a first gap (D1).Friction that may occur between the cam structures (1791, 1792) of the interlocking gears (173) and the first cam portions (563, 564) of the first cam member (560) may be lost, and the overall frictional force occurring in the hinge assembly (240) when the electronic device (200) is folded and / or unfolded may be reduced.

[0147] The anti-flow structure (601) can support the interlocking gears (173) in a first direction (e.g., +y-axis direction) so that the first to fourth contact points are maintained. The anti-flow structure (601) can be configured to be movable in the +y-axis or -y-axis direction together with the first inner shaft (133) and the second inner shaft (134). For example, the second gear bracket (630), the second shaft bracket (650), and the fixing member (670) can be coupled to fixed positions of the inner shafts (133, 134) and can be moved integrally with the inner shafts (133, 134).

[0148] Specifically, in one embodiment, the lower elastic member (e.g., the second elastic assembly (120) of FIG. 5) may be positioned in a compressed form between the second cam member (570) and the second shaft bracket (650) so as to apply an elastic force in a first direction (e.g., the +y-axis direction) to the second shaft bracket (650). For example, the second shaft bracket (650) may be applied with a first lower elastic force (Fi3) in the +y-axis direction from the second-third elastic member (123) of the lower elastic member, and with a second lower elastic force (Fi4) in the +y-axis direction from the second-fourth elastic member (124). The second shaft bracket (650) may be fixed (or coupled) to the first inner shaft (133) and the second inner shaft (134) together with the fixing member (670). The lower elastic force (Fi3, Fi4) applied to the second shaft bracket (650) can be transmitted to the first inner shaft (133) and the second inner shaft (134), respectively. The first inner shaft (133) and the second inner shaft (134) can be moved in the +y-axis direction by the lower elastic force transmitted to the first inner shaft (133) and the second inner shaft (134). When the inner shafts (133, 134) move, the second gear bracket (630), the second shaft bracket (650), and the fixing member (670) can be moved together in the +y-axis direction. The inner shafts can be moved by the lower elastic force until the interlocking gears (173) come into contact with the first cam member (560). For example, the interlocking gears (173) can be supported in the +y-axis direction by the second gear bracket (630) that moves together with the inner shafts. The first gap (D1) formed between the second gear bracket (630) and the interlocking gears (173) can be reduced or eliminated by the lower elastic force. By the lower elastic force, the interlocking gears (173) come into contact with the first cam member (560), so that in addition to the first contact point and the second contact point, the third contact point and the fourth contact point can be formed.Through the first contact surface (S1) formed by the above contacts, maximum frictional force can be achieved during the folding and / or unfolding process of the electronic device (200).

[0149] For example, the frictional force generated at the first contact surface (S1) may include a frictional force due to contact between the first peak (551) of the first-second cam structure (450) and the first-first cam portion (561), a frictional force due to contact between the second peak (552) of the second-second cam structure (470) and the first-second cam portion (562), a frictional force due to contact between the peak (1781) of the third cam structure (1791) and the third peak (553) of the first-third cam portion (563), and a frictional force due to contact between the peak (1782) of the fourth cam structure (1792) and the fourth peak (554) of the first-fourth cam portion (564).

[0150] In one embodiment, when the first contact surface (S1) is formed by the lower elastic force, the upper surface (e.g., the surface facing the -y-axis) of the second shaft bracket (650) may be positioned below (e.g., in the +y-axis direction) the upper surfaces (e.g., the surfaces facing the -y-axis) of the connecting members (661, 662) on both sides (e.g., in the +x-axis and -x-axis directions) by a second distance (D2). In addition, the upper surface (e.g., the surface facing the -y-axis) of the fixing member (670) may be positioned below (e.g., in the +y-axis direction) the upper surfaces (e.g., the surfaces facing the -y-axis) of the fixing parts (271, 272) on both sides (e.g., in the +x-axis and -x-axis directions). For example, the second distance (D2) may be substantially the same as the first distance (D1).

[0151] FIG. 15 is a drawing showing an example of a state in which force is transmitted in a second direction to a flow-preventing structure according to one embodiment.

[0152] Reference number of Fig. 15 <1501> The silver gear is formed larger than the main gear, and the reference number <1502> This is a drawing showing the first inner shaft (133) and the second inner shaft (134) moving in the -y-axis direction.

[0153] Referring to FIGS. 13 to 15, in one embodiment, the interlocking gears (173) may be formed larger than the main gears (e.g., the first main gear (171) and the second main gear (172) of FIG. 5). For example, compared to a preferred form of the interlocking gears (173) (e.g., the form of the first interlocking gear (1731) or the second interlocking gear (1732) illustrated in FIG. 13) (hereinafter, referred to as a normal state), the interlocking gears (173) may have a positive dimensional deviation (hereinafter, referred to as a positive deviation). For example, the width of the first interlocking gear (1731) in the +y-axis direction may be formed larger than the width of the first main gear (171) in the +y-axis direction. Due to the positive deviation, the interlocking gears (173) may be formed to protrude further in the +y-axis direction than the main gears (171, 172). For example, the -y-axis-facing surface of the interlocking gears (173) may contact the second gear bracket (630) to form a second contact surface (S2). The +y-axis-facing surface of the interlocking gears (173) may contact the first cam member (560) to form a first contact surface (S1). Since the interlocking gears (173) are formed larger than the main gears (171, 172), the first contact surface (S1) may not include the first contact point and the second contact point. For example, the first cam member (560) may be pushed in the +y-axis direction by the interlocking gears (173), and accordingly, the 1-2 cam structure (450) and the 2-2 cam structure (470) may be spaced apart from the first cam member (560) by a third gap (D3) (e.g., a second gap). As the first cam member (560) is pushed by the linkage gears (173), the upper elastic member (e.g., the first elastic assembly (110) of FIG. 5) disposed between the first cam member (560) and the support bracket (800) can be compressed to a certain level.

[0154] As the third gap (D3) occurs, contact between the first-second cam structure (450) and the second-second cam structure (470) and the first cam member (560) may be lost. Frictional force that may occur between the cam structures (450, 470) of the arm members (410, 420) and the first cam portions (561, 562) of the first cam member (560) may be lost, and the overall frictional force that occurs in the hinge assembly (240) when the electronic device (200) is folded and / or unfolded may be reduced.

[0155] The anti-flow structure (601) can support the interlocking gears (173) in a second direction (e.g., -y-axis direction) so that the first to fourth contact points are maintained. For example, the second gear bracket (630), the second shaft bracket (650), and the fixing member (670) can be coupled to fixed positions of the inner shafts (133, 134) and move in the second direction (e.g., -y-axis direction) as one body with the inner shafts (133, 134).

[0156] Specifically, in one embodiment, the lower elastic member (e.g., the second elastic assembly (120) of FIG. 5) may be positioned in a compressed form between the second cam member (570) and the second shaft bracket (650) so as to apply an elastic force in a first direction (e.g., the +y-axis direction) to the second shaft bracket (650). For example, the second shaft bracket (650) may be applied with a first lower elastic force (Fi3) in the +y-axis direction from the second-third elastic member (123) of the lower elastic member, and with a second lower elastic force (Fi4) in the +y-axis direction from the second-fourth elastic member (124). The second shaft bracket (650) may be fixed (or coupled) to the first inner shaft (133) and the second inner shaft (134) together with the fixing member (670). The lower elastic force (Fi3, Fi4) applied to the second shaft bracket (650) can be transmitted to the first inner shaft (133) and the second inner shaft (134).

[0157] At the same time, the upper elastic member (e.g., the first elastic assembly (110) of FIG. 5) compressed by the +y-axis pushing of the first cam member (560) can apply an elastic force (e.g., a restoring force) in a second direction (e.g., a -y-axis direction) to the first cam member (560). For example, the first cam member (560) can be applied with a first upper elastic force (Fs1) in the -y-axis direction from the 1-1 elastic member (111), a second upper elastic force (Fs2) in the -y-axis direction from the 1-2 elastic member (112), a third upper elastic force (Fs3) in the -y-axis direction from the 1-3 elastic member (113), and a fourth upper elastic force (Fs4) in the -y-axis direction from the 1-4 elastic member (114). The upper elastic force (Fs1, Fs2, Fs3, Fs4) can be transmitted from the first cam member (560) to the interlocking gears (173) through the first contact surface (S1), and from the interlocking gears (173) to the second gear bracket (630) through the second contact surface (S2). The upper elastic force transmitted to the second gear bracket (630) can be transmitted to the first inner shaft (133) and the second inner shaft (134).

[0158] The first inner shaft (133) and the second inner shaft (134) can be moved in the -y-axis direction by the lower elastic force and the upper elastic force transmitted to the first inner shaft (133) and the second inner shaft (134). For example, the lower elastic force transmitted to the inner shafts (133, 134) can be offset by the upper elastic force. For example, the elastic members exerting the upper elastic force (e.g., the 1-1 elastic members (111) to the 1-4 elastic members (114)) can be arranged in greater numbers than the elastic members exerting the lower elastic force (e.g., the 2-3 elastic members (123) and the 2-4 elastic members (124)). Only the net force (e.g., net force) remaining after the lower elastic force of the upper elastic force is offset is applied to the inner shafts (133, 134), so that the inner shafts can be moved in the -y-axis direction.

[0159] When the inner shafts are moved, the second gear bracket (630), the second shaft bracket (650), and the fixing member (670) can be moved together in the -y-axis direction. The inner shafts can be moved by the combined force until the first cam member (560) comes into contact with the first-second cam structure (450) and the second-second cam structure (470). For example, the interlocking gears (173) can be moved in the -y-axis direction while in contact with the second gear bracket (630) and the first cam member (560) that move together with the inner shafts. The combined force can reduce or eliminate the third gap (D3) formed between the cam structures (450, 470) of the arm members (410, 420) and the first cam member (560). By the above combined force, the cam structures (450, 470) of the female member are brought into contact with the first cam member (560), so that, in addition to the third contact point and the fourth contact point, the first contact point and the second contact point can be maintained. Through the first contact surface (S1) formed by the contact points, the maximum frictional force can be implemented during the folding and / or unfolding process of the electronic device (200).

[0160] For example, the frictional force generated at the first contact surface (S1) may include a frictional force due to contact between the first peak (551) of the first-second cam structure (450) and the first-first cam portion (561), a frictional force due to contact between the second peak (552) of the second-second cam structure (470) and the first-second cam portion (562), a frictional force due to contact between the peak (1781) of the third cam structure (1791) and the third peak (553) of the first-third cam portion (563), and a frictional force due to contact between the peak (1782) of the fourth cam structure (1792) and the fourth peak (554) of the first-fourth cam portion (564).

[0161] In one embodiment, when the first contact surface (S1) is formed by the combined force, the upper surface (e.g., the surface facing the -y-axis) of the second shaft bracket (650) may be positioned above (e.g., in the -y-axis direction) the upper surfaces (e.g., the surfaces facing the -y-axis) of the connecting members (661, 662) on both sides (e.g., in the +x-axis and -x-axis directions) by a fourth distance (D4). In addition, the upper surface (e.g., the surface facing the -y-axis) of the fixing member (670) may be positioned above (e.g., in the -y-axis direction) the upper surfaces (e.g., the surfaces facing the -y-axis) of the fixing parts (271, 272) on both sides (e.g., in the +x-axis and -x-axis directions). For example, the fourth distance (D4) may be substantially the same as the third distance (D3).

[0162] According to one embodiment, the anti-flow structure (601) and the first inner shaft (133) and the second inner shaft (134) coupled thereto may be formed to be movable separately from the first outer shaft (131) and the second outer shaft (132). The anti-flow structure (601) may be organically arranged with elastic members (e.g., the first elastic assembly (110) and the second elastic assembly (120)) so that an elastic force may be transmitted to the inner shafts (133, 134). For example, at least a portion of the elastic members (e.g., the lower elastic member) may be arranged to apply an elastic force to the anti-flow structure (601) in a first direction (e.g., the +y-axis direction), and at least another portion of the elastic members (e.g., the upper elastic member) may be arranged to apply an elastic force to the anti-flow structure (601) in a second direction (e.g., the -y-axis direction).

[0163] According to one embodiment, a reduction in frictional force due to dimensional deviation (e.g., negative deviation or positive deviation) of the interlocking gears (173) can be prevented through the separate formation of the anti-flow structure (601) and the inner shafts (133, 134) and the arrangement of elastic members that exert elastic forces in different directions on the anti-flow structure (601). As described above, the first contact surface (S1) composed of the first contact point to the fourth contact point can be maintained regardless of the occurrence of dimensional deviation of the interlocking gears (173). In addition, the frictional force utilized to maintain the folding angle in the folding mode (e.g., flex mode) of the electronic device (200) can be uniformly generated. In one embodiment, since the first contact surface (S1) can be maintained at all times, the occurrence of assembly deviation or joint of the linkage gears (173), arm members (410, 420), and / or first cam member (560) can be reduced. In addition, the durability and lifespan of the hinge assembly (e.g., the first hinge assembly (240)) can be increased.

[0164] FIG. 16A is a drawing showing an example of a hinge assembly of an electronic device according to one embodiment.

[0165] FIG. 16a is a drawing showing a modified embodiment of the first hinge assembly (240) illustrated in FIG. 5, wherein the first hinge assembly (240) further includes a separate elastic body (150). For each component of FIG. 16a that overlaps with the component of FIG. 5, reference may be made to the description of the component of FIG. 5, and the duplicate description will be omitted.

[0166] Referring to FIG. 16A, in one embodiment, the first hinge assembly (e.g., the first hinge assembly (240) of FIG. 5) may include a first elastic body (153) formed to surround at least a portion of the first inner shaft (133) and a second elastic body (154) formed to surround at least a portion of the second inner shaft (134). For example, the first elastic body (153) and the second elastic body (154) may surround the first inner shaft (133) and the second inner shaft (134), respectively, which are positioned on the second gear bracket (630) (e.g., in the -y-axis direction).

[0167] In one embodiment, the first elastic body (153) and the second elastic body (154) may be arranged to pressurize the second gear bracket (630) in a first direction (e.g., in the +y-axis direction). For example, the first elastic body (153) and the second elastic body (154) may be arranged to maintain a certain level of compression between the second gear bracket (630) and another component (e.g., the fixed bracket (530) of FIG. 5) to which the shafts (131, 132, 133, 134) are coupled. The second gear bracket (630) pressed by the first elastic body (153) and the second elastic body (154) may support the interlocking gears (173) in the +y-axis direction. The interlocking gears (173) can be moved in the +y-axis direction by the elastic force transmitted from the first elastic body (153) and the second elastic body (154).

[0168] Alternatively, in one embodiment, the first elastic body (153) and the second elastic body (154) may be disposed on the upper surface (e.g., the surface facing the -y-axis) of the interlocking gears (173). The interlocking gears (173) may directly receive elastic force from the first elastic body (153) and the second elastic body (154), and the contact between the interlocking gears (173) and the first cam member (560) may be maintained by the elastic force.

[0169] When the interlocking gears (173) are formed to be smaller than the normal state (e.g., have a negative deviation), the elastic force of the elastic body (150) in the +y-axis direction can be transmitted to the second gear bracket (630) or the interlocking gears (173). The interlocking gears (173) can be moved in the +y-axis direction, and contact between the cam structures of the interlocking gears (173) and the first cam portions of the first cam member (560) can be maintained.

[0170] When the interlocking gears (173) are formed to be larger than the normal state (e.g., have a positive deviation), the first cam member (560) is pushed in the +y-axis direction, and an elastic force in the -y-axis direction may be generated due to the compression of the first elastic assembly (110). The elastic force in the +y-axis direction transmitted from the elastic body (150) may be offset by the elastic force in the -y-axis direction transmitted from the first elastic assembly (110). For example, only the resultant force remaining after the elastic force of the elastic body (150) is offset from the elastic force of the first elastic assembly (110) may be applied to the interlocking gears (173). The interlocking gears (173) may be moved in the -y-axis direction by the resultant force, and contact between the second arm portion (412) and the fourth arm portion (422) and the first cam member (560) may be maintained.

[0171] In one embodiment, through the elastic body (150) and the first elastic assembly (110), the contact and friction due to the contact of the cam structure of the first arm member (410), the cam structure of the second arm member (420), the cam structure of the linkage gears (173), and the first cam portions of the first cam member (560) can be constantly maintained.

[0172] FIG. 16b is a drawing showing an example of a hinge assembly of an electronic device according to one embodiment.

[0173] FIG. 16b is a drawing showing a modified embodiment of the first hinge assembly (240) illustrated in FIG. 5, in which the shafts (131, 132, 133, 134) of the first hinge assembly (240) are configured to move integrally. For each component of FIG. 16b that overlaps with the component of FIG. 5, reference may be made to the description of the component of FIG. 5, and the duplicated description is omitted. Reference numbers of FIG. 16b <1601> The first hinge assembly (240) is shown as viewed from the +z axis, and reference numbers <1602> shows the first hinge assembly (240) viewed obliquely along the +z axis.

[0174] Referring to FIG. 16B, in one embodiment, a first hinge assembly (e.g., the first hinge assembly (240) of FIG. 5) may include a first gear bracket (610), a second gear bracket (630), a third shaft bracket (750), and a first fixing member (770). In one embodiment, the third shaft bracket (750) may be mounted on at least a portion of the shafts (131, 132, 133, 134). For example, the shafts may be formed with a step (e.g., the second step (1333) of FIG. 12) that may engage with the third shaft bracket (750). The third shaft bracket (750) may include insertion holes through which the first outer shaft (131), the second outer shaft (132), the first inner shaft (133), and the second inner shaft (134) pass, respectively. The first fixing member (770) may be coupled to the shafts together with the third shaft bracket (750). For example, the first fixing member (770) may be coupled to a step formed on the shafts. Since the third shaft bracket (750) is coupled to not only the inner shafts (133, 134) but also the outer shafts (131, 132), the elastic force transmitted from the first elastic assembly (110) or the second elastic assembly (120) may be transmitted to the inner shafts (133, 134) and the outer shafts (131, 132) through the third shaft bracket (750).

[0175] The above shafts can be moved integrally so that contact between the cam structures (e.g., the cam structure of the linkage gears (173) and the cam structures of the arm members (410, 420)) and the first cam member (560) can be maintained. For example, when the linkage gears (173) are formed smaller than the normal state (e.g., have a negative deviation), the third shaft bracket (750) and the shafts can be moved integrally in the first direction by the elastic force of the second elastic assembly (120) in the first direction (e.g., the +y-axis direction). For example, when the interlocking gears (173) are formed to be larger than the normal state (e.g., have a positive deviation), the elastic force in the second direction (e.g., -y-axis direction) transmitted from the first elastic assembly (110) is offset by the elastic force in the first direction transmitted from the second elastic assembly (120), and the remaining force causes the third shaft bracket (750) and the shafts to move in the second direction as one body.

[0176] In one embodiment, the shafts may be movably connected to a bracket (e.g., a first shaft bracket (270) of FIG. 3) of a first hinge assembly (240) that is coupled to a hinge housing (e.g., a hinge housing (250) of FIG. 2) so that the shafts can move integrally. For example, a hole (537) for coupling the first shaft bracket (e.g., the first shaft bracket (270) of FIG. 3) to the hinge housing (250) may be omitted. For example, the first shaft bracket (270) may be formed separately from the hinge housing (250).

[0177] The shape of the flow prevention structure (601) according to one embodiment disclosed in this document is not limited to the above-described content, and at least some components may be modified or omitted. For example, the second gear bracket (630) may be omitted from the flow prevention structure (601). For example, the first inner shaft (133) and the second inner shaft (134) may be formed with a structure that engages (e.g., is fixed to) the interlocking gears (173), so that the second gear bracket (630) may be replaced. For example, the first inner shaft (133) may include a first step structure formed so that the first interlocking gear (1731) is supported in a first direction (e.g., the +y-axis direction). The second inner shaft (134) may include a second step structure formed so that the second interlocking gear (1732) is supported in the first direction (e.g., the +y-axis direction). For example, the first step structure and the second step structure may be formed in a shape identical to or similar to the first step portion (1331) or the second step portion (1333) so that the interlocking gears (173) can be installed. By forming the inner shafts (133, 134) to mesh with the interlocking gears (173), the lower elastic force of the lower elastic member transmitted to the second shaft bracket (650) can be transmitted to the interlocking gears (173).

[0178] Alternatively, as an example, the second shaft bracket (650) may be omitted from the flow-preventing structure (601). For example, the second shaft bracket (650) may be replaced by a fixing member (670) arranged to be in contact with the lower elastic member. For example, a fixing portion may be formed on the fixing member (670) on which the lower elastic member may be fixed. The fixing member (670) may be arranged to be pressed by the lower elastic member, and at least a portion of the fixing member (670) may be fixed to the inner shafts (133, 134), so that the lower elastic force generated from the lower elastic member may be transmitted to the inner shaft. FIG. 17 is a drawing showing an example of a hinge assembly in an unfolded state of an electronic device according to one embodiment.

[0179] Reference number of Fig. 17 <1701> The unfolded state of the hinge assembly (e.g., the first hinge assembly (240) of FIG. 5) is shown as viewed from the -z axis, and reference number <1702> It shows the unfolded state of the hinge assembly (240) as viewed obliquely from the +z axis.

[0180] Referring to FIGS. 1A to 17, in one embodiment, the electronic device (200) may have an unfolded state. When the electronic device (200) is in an unfolded state (e.g., when the first display (230) is in an unfolded state, or when the first housing (210) and the second housing (220) are in an unfolded state), the first arm member (410) coupled to the first wing plate (261) may be arranged symmetrically with respect to the second arm member (420) coupled to the second wing plate (262) with respect to the center of the electronic device (200). The end of the first arm member (410) in the +x-axis direction and the end of the second arm member (420) in the -x-axis direction may be spaced apart by a first distance (e.g., the longest distance).

[0181] According to one embodiment, when the electronic device (200) is in an unfolded state, a portion of the 1-1 cam structure (440) of the first arm member (410) and a portion of the second cam member (570) may be in contact. A top portion of the 1-1 cam structure (440) (e.g., a portion facing the +y-axis) and a top portion of the second cam member (570) (e.g., a portion facing the -y-axis) may be spaced apart from each other. An empty space (e.g., a gap) may be formed between the top portion of the 1-1 cam structure (440) and the top portion of the second cam member (570).

[0182] According to one embodiment, when the electronic device (200) is in an unfolded state, a portion of the first-second cam structure (450) of the first arm member (410) and a portion of the first cam member (560) may be in contact. A top portion of the first-second cam structure (450) (e.g., a portion facing the +y-axis) and a top portion of the first cam member (560) (e.g., a portion facing the -y-axis) may be spaced apart from each other. An empty space (e.g., a gap) may be formed between the top portion of the first-second cam structure (450) and the top portion of the first cam member (560).

[0183] According to one embodiment, when the electronic device (200) is in an unfolded state, the second-first elastic member (121), the second-second elastic member (122), the second-third elastic member (123), and the second-fourth elastic member (124) may act to push the second cam member (570) in one direction (e.g., in the -y-axis direction). The second-first elastic member (121), the second-second elastic member (122), the second-third elastic member (123), and the second-fourth elastic member (124) may exert an elastic force to push the second cam member (570) toward the first-first cam structure (440) and the second-first cam structure (460). Due to the elastic force, a portion of the second cam member (570) may come into contact with a portion of the first-first cam structure (440) and the second-first cam structure (460), thereby generating a first cam frictional force.

[0184] According to one embodiment, when the electronic device (200) is in an unfolded state, the first-first elastic member (111), the first-second elastic member (112), the first-third elastic member (113), and the first-fourth elastic member (114) may act to push the first cam member (560) in one direction (e.g., in the -y-axis direction). The first-first elastic member (111), the first-second elastic member (112), the first-third elastic member (113), and the first-fourth elastic member (114) may exert an elastic force to push the first cam member (560) toward the first-second cam structure (450) and the second-second cam structure (470). Due to the elastic force, a portion of the first cam member (560) may come into contact with a portion of the first-second cam structure (450) and the second-second cam structure (470), thereby generating a second cam frictional force. According to one embodiment, the electronic device (200) can perform an unfolding operation of the electronic device (200) with less force by using the first cam friction force and the second cam friction force.

[0185] In the unfolded state of the electronic device (200), the anti-flow structure (601) including the second gear bracket (630), the second shaft bracket (650), and the fixing member (670) can be set to move together with the first inner shaft (e.g., the first inner shaft (133) of FIG. 5) and the second inner shaft (e.g., the second inner shaft (134) of FIG. 5) so that the first-second cam structure (450) and the second-second cam structure (470) remain in contact with the first cam member (560). For example, the interlocking gears (173) can be moved in the first direction (e.g., the +y-axis direction) or the second direction (e.g., the -y-axis direction) by the movement of the anti-flow structure (601) and the inner shafts (133, 134). The interlocking gears (173) can maintain contact with the first cam member (560) even after moving in the first direction or the second direction. By further utilizing the third cam frictional force generated by the contact between the first cam member (560) and the cam structures of the interlocking gears (173) (e.g., the third cam structure (1791) and the fourth cam structure (1792) of FIG. 13), the folding angle maintenance and unfolding operation of the electronic device (200) can be easily performed.

[0186] FIG. 18 is a drawing showing an example of a hinge assembly in a partially folded state of an electronic device according to one embodiment.

[0187] Reference number of Fig. 18 <1801> The figure shows a partially folded state of a hinge assembly (e.g., the first hinge assembly (240) of FIG. 5) as viewed from the -z axis, and reference number <1802> It shows a partially folded state of the hinge assembly (240) viewed obliquely from the +z axis.

[0188] Referring to FIGS. 1A to 18, in one embodiment, when external pressure is applied to the electronic device (200) in an unfolded state, the electronic device (200) may be converted to a folded state at a first angle. For example, the first angle may include any one of angles between 60 degrees and 120 degrees. In the folded state at the first angle, the end of the first arm member (410) in the +x-axis direction and the end of the second arm member (420) in the -x-axis direction may be spaced apart by a second distance that is shorter than the first distance (e.g., the longest distance).

[0189] When the electronic device (200) is in a folded state at a first angle, the top portion (e.g., the portion facing the +y-axis) of the cam structure (440, 450) of the first arm member (410) and the top portion (e.g., the portion facing the -y-axis) of the cam member (560, 570) may be in contact. While the electronic device (200) changes from an unfolded state to a folded state at a first angle, the contact area between the top portion of the cam structure (440, 450) of the first arm member (410) and the top portion of the cam member (560, 570) may gradually increase. For example, when the electronic device (200) is in a folded state at a first angle, the contact area between the top portion of the cam structure (440, 450) of the first arm member (410) and the top portion of the cam member (560, 570) may be maximized.

[0190] According to one embodiment, when the electronic device (200) is in a folded state at a first angle, at least a portion of a top portion of the second cam member (570) may be brought into contact with at least a portion of a top portion of the second cam structure (470) by the elastic force of each of the second-first elastic member (121), the second-second elastic member (122), the second-third elastic member (123), and the second-fourth elastic member (124). A first cam frictional force may be generated between at least a portion of the top portion of the second cam member (570) and at least a portion of the top portion of the first-first cam structure (440). As the contact area between the top portion of the first-first cam structure (440) and the top portion of the second cam member (570) increases in the folded state at the first angle, the first cam frictional force may increase. The first cam frictional force in the folded state at the first angle may have a greater magnitude than the first cam frictional force in the unfolded state.

[0191] According to one embodiment, when the electronic device (200) is in a folded state at a first angle, at least a portion of a top portion of the first cam member (560) may be brought into contact with at least a portion of a top portion of the first-second cam structure (450) by the elastic force of each of the first-first elastic member (111), the first-second elastic member (112), the first-third elastic member (113), and the first-fourth elastic member (114). A second cam frictional force may be generated between at least a portion of the top portion of the first cam member (560) and at least a portion of the top portion of the first-second cam structure (450). As the contact area between the top portion of the first-second cam structure (450) and the top portion of the first cam member (560) increases in the folded state at the first angle, the second cam frictional force may increase. The second cam frictional force in the folded state at the first angle may have a greater magnitude than the second cam frictional force in the unfolded state.

[0192] According to one embodiment, the electronic device (200) in the first angle folded state can maintain the mounting angle with greater force by utilizing the increased first cam frictional force and / or second cam frictional force compared to the unfolded state. The electronic device (200) in the first angle folded state can provide a stable mounting angle by utilizing a higher frictional force than when in the unfolded state.

[0193] In the first angle folded state of the electronic device (200), the anti-flow structure (601) including the second gear bracket (630), the second shaft bracket (650), and the fixing member (670) can maintain a position set so that the first cam member (560) and the cam structures of the interlocking gears (173) (e.g., the third cam structure (1791) and the fourth cam structure (1792) of FIG. 13) are in contact. By further utilizing the third cam frictional force generated by the contact of the first cam member (560) and the cam structures (1791, 1792) of the interlocking gears (173), the folding angle (e.g., the first angle) of the electronic device (200) can be stably maintained. The hinge assembly can support stable maintenance of various folding angles (e.g., in a range of approximately 60 degrees to 120 degrees). The exact angle range may vary depending on the cam geometry, elasticity, and bracket design.

[0194] FIG. 19 is a drawing showing an example of a hinge assembly in a fully folded state of an electronic device according to one embodiment.

[0195] Reference number of Fig. 19 <1901> The fully folded state of the hinge assembly (e.g., the first hinge assembly (240) of FIG. 5) is shown as viewed from the -z axis, and reference number <1902> It shows the fully folded state of the hinge assembly (240) when viewed obliquely along the +z axis.

[0196] Referring to FIGS. 1A to 19, in one embodiment, when external pressure is applied to the electronic device (200) in a folded state at a first angle, the electronic device (200) may be converted to a folded state. In the folded state, the end of the first arm member (410) in the +x-axis direction and the end of the second arm member (420) in the -x-axis direction may be spaced apart by a third distance (e.g., the shortest distance) that is shorter than the second distance.

[0197] When the electronic device (200) is in a folded state, a part of the first-first cam structure (440) of the first arm member (410) and a part of the second cam member (570) may come into contact. While the electronic device (200) changes from a folded state at a first angle to a folded state, the contact area between the top portion (e.g., the portion facing the y-axis) of the cam structure (440, 450) of the first arm member (410) and the top portion of the cam member (560, 570) may gradually decrease.

[0198] According to one embodiment, when the electronic device (200) is in a folded state, a portion of the second cam member (570) may be brought into contact with at least a portion of the first-first cam structure (440) by the elastic force of each of the second-first elastic member (121), the second-second elastic member (122), the second-third elastic member (123), and the second-fourth elastic member (124). A first cam frictional force may be generated between at least a portion of the second cam member (570) and at least a portion of the first-first cam structure (440). As the contact area between the top portion of the first-first cam structure (440) and the top portion of the second cam member (570) decreases while changing from the folded state at the first angle to the folded state, the first cam frictional force may be reduced. The first cam frictional force in the folded state may have a smaller magnitude than the first cam frictional force in the folded state at the first angle.

[0199] According to one embodiment, when the electronic device (200) is in a folded state, a portion of the first cam member (560) may come into contact with a portion of the first-second cam structure (450) due to the elastic force of each of the first-first elastic member (111), the first-second elastic member (112), the first-third elastic member (113), and the first-fourth elastic member (114). A second cam frictional force may be generated between a portion of the first cam member (560) and a portion of the first-second cam structure (450). As the contact area between the top portion of the first-second cam structure (450) and the top portion of the first cam member (560) decreases while changing from the folded state at the first angle to the folded state, the second cam frictional force may be reduced. The second cam frictional force in the folded state may have a smaller magnitude than the second cam frictional force in the folded state at the first angle.

[0200] In the folded state of the electronic device (200), the movement prevention structure (601) including the second gear bracket (630), the second shaft bracket (650), and the fixing member (670) can maintain a position set so that the first cam member (560) and the cam structures of the interlocking gears (173) (e.g., the third cam structure (1791) and the fourth cam structure (1792) of FIG. 13) are in contact. A third cam frictional force can be generated at the contact surface of the first cam member (560) and the cam structures (1791, 1792) of the interlocking gears (173).

[0201] A hinge assembly (240, 240-1) according to one embodiment disclosed in the present document comprises: a first arm member (410) including a first main gear (171) that is coupled to a first shaft (131) extending in a first direction and includes a first cam structure (450); a second arm member (420) including a second main gear (172) that is coupled to a second shaft (132) extending in the first direction and includes a second cam structure (470); a first linkage gear (1731) that is engaged with the first main gear (171) and includes a third cam structure (1791); a second linkage gear (1732) that is engaged with the second main gear (172) and includes a fourth cam structure (1792); a third shaft (133) that is coupled with the first linkage gear (1731) and formed parallel to the first shaft (131); A fourth shaft (134) coupled with the second linkage gear (1732) and formed parallel to the second shaft (132); a first cam member (560) that is at least partially penetrated by the third shaft (133) and the fourth shaft (134) and is disposed in the first direction of the first linkage gear (1731) and the second linkage gear (1732) so as to face the third cam structure (1791) and the fourth cam structure (1792); at least one bracket (610, 630, 650,) coupled with at least one of the first shaft (131), the second shaft (132), the third shaft (133), and the fourth shaft (134).270); a first elastic assembly (110) configured to urge the first cam member (560) in a second direction opposite to the first direction so as to maintain contact between the first cam member (560) and the third cam structure (1791) and contact between the first cam member (560) and the fourth cam structure (1792); and a second elastic assembly (120) configured to urge the third shaft (133) and the fourth shaft (134) in the first direction so as to maintain contact between the first cam member (560) and the third cam structure (1791) and contact between the first cam member (560) and the fourth cam structure (1792). In some implementations, instead of a single cam member shared between the third cam structure and the fourth cam structure, separate cam members may be provided on each side. The first cam member engages with the third cam structure, the second cam member engages with the fourth cam structure, and both cam members can be selectively biased by their respective elastic members. The first main gear (171) including the first arm member (410) and the first cam structure (450) can contribute to transmitting rotational motion to the hinge and controlling torque generation. The first cam structure (450) can cooperate with the first cam member to provide resistance at a specified folding angle so that the hinge can stably maintain an intermediate position during the folding operation. Similarly, the second main gear (172) including the second arm member (420) and the second cam structure (470) can cooperate with the first gear set configured to enable symmetrical folding and can contribute to applying a balanced torque across the hinge structure. The first linkage gear (1731) having the third cam structure (1791) not only transmits torque between the main gears but also provides a stopping function in cooperation with the first cam member, thereby allowing the hinge to maintain a specific angular position and improving the overall durability of the torque generating mechanism. Similarly,A second linkage gear (1732) having a fourth cam structure (1792) can mirror the behavior of the first linkage gear (1731) to ensure consistent resistance across both sides of the hinge and improve folding symmetry and torque uniformity. A third shaft (133) can structurally support and align the first linkage gear (1731). The third shaft (133) is coupled to the first linkage gear (1731) and extends parallel to the outer shafts to ensure coaxial alignment and stable gear meshing, thereby minimizing wobble and mechanical backlash. A fourth shaft (134) can provide a mirrored function on the opposite side of the hinge to ensure the integration and synchronous operation of the second linkage gear (1732). A first cam member (560) is operatively coupled via the third and fourth shafts and can face the third and fourth cam structures. This configuration can improve the stability of the hinge at various use angles by allowing the cam member to smoothly convert the axial force from the elastic assemblies into frictional engagement. The brackets (610, 630, 650, 270) can be configured to precisely constrain the axial position of each shaft to prevent unintended movement and maintain the alignment of the gear and cam components. This can contribute to maintaining torque characteristics and preventing wear during repetitive folding operations. The first elastic assembly (110) can urge the first cam member (560) in a second direction (e.g., -y-axis) to ensure continuous engagement with the third and fourth cam structures. This can improve the position holding ability of the hinge at specific angular intervals, especially in flex mode, and can improve durability by compensating for wear over time. In addition,The second elastic assembly (120) can apply directional force to the third and fourth shafts to strengthen the contact pressure of the cam interface. This dual-force configuration can reduce torque mismatch and improve long-term mechanical stability by ensuring that the cam member and gears are tightly engaged even when dimensional deviations or vibrations occur.

[0202] According to one embodiment disclosed in the present document, the at least one bracket (610, 630, 650, 270) may include a first gear bracket (610) having a first insertion hole into which one end of the first shaft (131) in the first direction is inserted and a second insertion hole into which one end of the second shaft (132) in the first direction is inserted; and a second gear bracket (630) having a third insertion hole (634) into which one end of the third shaft (133) in the first direction is inserted and a fourth insertion hole (635) into which one end of the fourth shaft (134) in the first direction is inserted. The first gear bracket (610) and the second gear bracket (630) may provide fixed support for the first and second shafts and the third and fourth shafts, respectively. By precisely forming insertion holes at the ends of the shafts, these gear brackets can ensure precise alignment and stable coupling between the shaft members and the hinge frame, thereby contributing to improved rotational accuracy and mechanical durability during repetitive folding operations.

[0203] According to one embodiment disclosed in the present document, the at least one bracket (610, 630, 650, 270) may further include a first shaft bracket (270) having a fifth insertion hole into which the other end of the first shaft (131) in the second direction is inserted and a sixth insertion hole into which the other end of the second shaft (132) in the second direction is inserted; and a second shaft bracket (650) having a seventh insertion hole (654) into which the other end of the third shaft (133) in the second direction is inserted and an eighth insertion hole (655) into which the other end of the fourth shaft (134) in the second direction is inserted. One or more of the brackets (610, 630, 650, 270) may be provided independently. For example, the gear brackets (610, 630) may be provided without the shaft brackets (270, 650), and vice versa. Each bracket may function independently to support at least one shaft, and may not be required to be applied to all configurations. The shaft brackets 270 and 650 may secure both ends of each shaft to ensure axial fixation and prevent lateral displacement. This double-ended bracket structure can enhance the rigidity of the hinge assembly, particularly under external forces, thereby reducing shaft wobble and improving the hinge life.

[0204] According to one embodiment disclosed herein, the second gear bracket (630) can contact the surfaces of the first linkage gear (1731) and the second linkage gear (1732) facing the second direction. In some embodiments, the second gear bracket (630) may be spaced from the linkage gears instead of making direct contact to allow for relative movement or tolerance absorption during operation. By having the second gear bracket (630) contact the upper surfaces of the linkage gears, the hinge assembly can minimize gear tilt or axial drift. This contact structure can also maintain torque balance between the left and right hinges, thereby providing more uniform folding characteristics throughout the rotational range.

[0205] According to one embodiment disclosed in the present document, the second elastic assembly (120) may be positioned to contact the surface of the second shaft bracket (650) facing the second direction. Positioning the second elastic assembly (120) to contact the second shaft bracket (650) can effectively transmit elastic force from the fixed structure to the shafts. This can help maintain pressure between the cam structures and the cam member even when mechanical tolerances change or thermal expansion occurs.

[0206] According to one embodiment disclosed in the present document, the first elastic assembly (110) may include a first elastic member (111) formed to surround at least a portion of the first shaft (131), a second elastic member (112) formed to surround at least a portion of the second shaft (132), a third elastic member (113) formed to surround at least a portion of the third shaft (133), and a fourth elastic member (114) formed to surround at least a portion of the fourth shaft (134). Subdividing the first elastic assembly (110) into individual elastic members (111-114) ensures that forces are applied independently to each shaft. This localized force distribution can reduce asymmetrical wear of the cam member and prevent misalignment of the rotational axis, particularly in a partially folded state.

[0207] According to one embodiment disclosed in the present document, the second elastic assembly (120) may include elastic members (123, 124) formed to surround at least a portion of each of the third shaft (133) and the fourth shaft (134). Furthermore, only one of the elastic members (e.g., 123 or 124) may be provided depending on design preference. Similarly, the first elastic assembly (110) may include less than four elastic members (111-114), each of which may be optionally included or omitted. The elastic members may be formed of a material such as a metal spring, a rubber elastomer, or a plastic composite. The shape may vary depending on the required force profile, and may include a wave washer, a foam pad, or a torsion spring. The elastic members 123 and 124 surrounding the third and fourth shafts can enable the second elastic assembly to apply a balanced axial force. This can help the shafts to adhere to the cam member in a direction that compensates for movement or vibration, and can stabilize the behavior of the hinge in the folded state.

[0208] According to one embodiment disclosed in the present document, the second shaft bracket (650) may further include a fixing member (670) configured to fix the second shaft bracket (650) to the third shaft (133) and the fourth shaft (134). The fixing member (670) may fix the second shaft bracket (650) to the third and fourth shafts to prevent independent movement of the shafts with respect to the bracket. This may contribute to the structural integrity of the anti-flow structure and improve the torque transmission accuracy between the elastic components and the cam surface.

[0209] According to one embodiment disclosed in the present document, a first step portion (1331) may be formed on one end of the third shaft (133) and one end of the fourth shaft (134) on which the second gear bracket (630) is mounted. The first step portions (1331) formed on the third and fourth shafts may provide mounting surfaces for the second gear bracket (630). These surfaces may ensure consistent contact pressure and allow for accurate vertical positioning of the bracket, thereby preventing mechanical slippage during angular switching of the hinge.

[0210] According to one embodiment disclosed in the present document, a second step portion (1333) on which the second shaft bracket (650) is mounted may be formed at the other end of the third shaft (133) and the other end of the fourth shaft (134). The second step portion (1333) can ensure stable mounting of the second shaft bracket (650), thereby improving bracket fixing strength. In addition, the dual-diameter design of the first step portion (1331) allows the shaft to be more firmly fitted into the hole, thereby enabling both axial fixation and flush bracket mounting, and contributing to a strong hinge support force.

[0211] According to one embodiment disclosed in the present document, the first stepped portion (1331) may include a first portion formed with a first diameter and at least a portion of which is inserted into the third insertion hole (634) and a second portion formed to face the second direction-facing side of the second gear bracket (630) and formed with a second diameter larger than the first diameter. Alternatively, the shaft end may include other shaft-seating or engagement structures, such as stepped recesses, flanges, or compression notches, instead of the strict stepped diameter portion. The second stepped portion (1333) may ensure stable seating of the second shaft bracket (650), thereby improving bracket fixing force. Additionally, the double diameter design of the first step (1331) allows the shaft to fit more firmly into the hole, enabling both axial fixation and embedded bracket mounting, and can contribute to a strong hinge support.

[0212] According to one embodiment disclosed in the present document, the second elastic assembly (120) further includes a fixing member (670) at least partially in contact with the second elastic assembly (120) and coupled with the third shaft (133) and the fourth shaft (134), and an elastic force generated from the second elastic assembly (120) can be transmitted to the third shaft (133) and the fourth shaft (134) through the fixing member (670). When the fixing member (670) is arranged to be in contact with the second elastic assembly, it can enable direct transmission of the elastic force to the shaft. This structure can support maintaining a continuous cam contact force even during repetitive motions or assembly deformations, and can improve torque stability during folding and unfolding operations.

[0213] According to one embodiment disclosed in the present document, a first step structure may be formed at one end of the third shaft (133) in the first direction, on which the first linkage gear (1731) is seated, and a second step structure may be formed at one end of the fourth shaft (134) in the first direction, on which the second linkage gear (1732) is seated. The step structures of the third and fourth shafts may serve as seating bases for the linkage gears, thereby accurately positioning the gears in the axial direction. This arrangement may reduce axial drift of the gears under load, and maintain smooth meshing of the gears throughout the hinge rotation.

[0214] According to one embodiment disclosed in the present document, the second elastic assembly (120) includes a first elastic body (153) formed to surround at least a portion of the third shaft (133) and a second elastic body (154) formed to surround at least a portion of the fourth shaft (134), wherein the first elastic body (153) and the second elastic body (154) can be arranged to face the surface of the second gear bracket (630) facing the second direction. By arranging the separate elastic bodies 153 and 154 around the third and fourth shafts and aligning them with the surfaces of the gear brackets, a constant pressing force can be obtained on both sides of the hinge. This can contribute to reliable torque balance and long-term functionality of the hinge.

[0215] According to one embodiment disclosed in the present document, the elastic force transmitted from the first elastic assembly (110) to the first cam member (560) may be set to be greater than the elastic force transmitted from the second elastic assembly (120) to the third shaft (133) and the fourth shaft (134). Alternatively, the elastic force applied by the second elastic assembly (120) may be equal to or greater than the elastic force of the first elastic assembly (110) depending on a desired hinge stiffness or torque profile. By setting the force of the first elastic assembly to be greater than the force of the second elastic assembly, a stable engagement of the cam member and the cam structures can be prioritized. This can ensure that the position stop function is consistently achieved even when an opposing axial force is applied to the shafts, thereby maintaining a user experience at various folding angles.

[0216] According to an embodiment disclosed in the present document, a foldable electronic device (200) includes at least one hinge assembly (240, 240-1) and a first housing (210) and a second housing (220) formed to be foldable around the at least one hinge assembly (240, 240-1), wherein the at least one hinge assembly (240, 240-1) includes: a first arm member (410) that is connected to a first shaft (131) extending in a first direction and includes a first main gear (171) that includes a first cam structure (450); a second arm member (420) that is connected to a second shaft (132) extending in the first direction and includes a second cam structure (470); a first linkage gear (1731) that is engaged with the first main gear (171) and includes a third cam structure (1791); A second linkage gear (1732) that is engaged with the second main gear (172) and includes a fourth cam structure (1792); a third shaft (133) that is coupled with the first linkage gear (1731) and formed parallel to the first shaft (131); a fourth shaft (134) that is coupled with the second linkage gear (1732) and formed parallel to the second shaft (132); a first cam member (560) that is at least partially penetrated by the third shaft (133) and the fourth shaft (134) and is arranged in the first direction of the first linkage gear (1731) and the second linkage gear (1732) so as to face the third cam structure (1791) and the fourth cam structure (1792); At least one bracket (610, 630, 650, 270) coupled to at least one of the first shaft (131), the second shaft (132), the third shaft (133), and the fourth shaft (134);A first elastic assembly (110) configured to urge the first cam member (560) in a second direction opposite to the first direction so as to maintain contact between the first cam member (560) and the third cam structure (1791) and contact between the first cam member (560) and the fourth cam structure (1792); and a second elastic assembly (120) configured to urge the third shaft (133) and the fourth shaft (134) in the first direction so as to maintain contact between the first cam member (560) and the third cam structure (1791) and contact between the first cam member (560) and the fourth cam structure (1792).

[0217] According to one embodiment disclosed in the present document, the at least one bracket (610, 630, 650, 270) may include a first gear bracket (610) having a first insertion hole into which one end of the first shaft (131) in the first direction is inserted and a second insertion hole into which one end of the second shaft (132) in the first direction is inserted; and a second gear bracket (630) having a third insertion hole (634) into which one end of the third shaft (133) in the first direction is inserted and a fourth insertion hole (635) into which one end of the fourth shaft (134) in the first direction is inserted.

[0218] According to one embodiment disclosed in the present document, the at least one bracket (610, 630, 650, 270) may further include a first shaft bracket (270) having a fifth insertion hole into which the other end of the first shaft (131) in the second direction is inserted and a sixth insertion hole into which the other end of the second shaft (132) in the second direction is inserted; and a second shaft bracket (650) having a seventh insertion hole (654) into which the other end of the third shaft (133) in the second direction is inserted and an eighth insertion hole (655) into which the other end of the fourth shaft (134) in the second direction is inserted.

[0219] According to one embodiment disclosed in this document, the second gear bracket (630) can be in contact with the surfaces of the first linkage gear (1731) and the second linkage gear (1732) facing the second direction.

[0220] According to one embodiment disclosed in this document, the second elastic assembly (120) may be positioned to contact the surface of the second shaft bracket (650) facing the second direction.

Claims

1. In the hinge assembly (240, 240-1), A first arm member (410) including a first main gear (171) that is connected to a first shaft (131) extending in a first direction and includes a first cam structure (450); A second arm member (420) including a second main gear (172) that is connected to a second shaft (132) extending in the first direction and includes a second cam structure (470); A first linkage gear (1731) that meshes with the first main gear (171) and includes a third cam structure (1791); A second linkage gear (1732) that meshes with the second main gear (172) and includes a fourth cam structure (1792); A third shaft (133) coupled with the first linkage gear (1731) and formed parallel to the first shaft (131); A fourth shaft (134) coupled with the second linkage gear (1732) and formed parallel to the second shaft (132); A first cam member (560) that is at least partially penetrated by the third shaft (133) and the fourth shaft (134) and is disposed in the first direction of the first linkage gear (1731) and the second linkage gear (1732) so as to face the third cam structure (1791) and the fourth cam structure (1792); At least one bracket (610, 630, 650, 270) coupled to at least one of the first shaft (131), the second shaft (132), the third shaft (133), and the fourth shaft (134); A first elastic assembly (110) configured to press the first cam member (560) in a second direction opposite to the first direction so as to maintain contact between the first cam member (560) and the third cam structure (1791) and contact between the first cam member (560) and the fourth cam structure (1792); and A hinge assembly comprising a second elastic assembly (120) configured to urge the third shaft (133) and the fourth shaft (134) in the first direction so as to maintain contact between the first cam member (560) and the third cam structure (1791) and contact between the first cam member (560) and the fourth cam structure (1792).

2. In claim 1, At least one of the above brackets (610, 630, 650, 270) A first gear bracket (610) having a first insertion hole into which one end of the first shaft (131) in the first direction is inserted and a second insertion hole into which one end of the second shaft (132) in the first direction is inserted; and A hinge assembly including a second gear bracket (630) having a third insertion hole (634) into which one end of the third shaft (133) in the first direction is inserted and a fourth insertion hole (635) into which one end of the fourth shaft (134) in the first direction is inserted.

3. In claim 1 or claim 2, At least one of the above brackets (610, 630, 650, 270) A first shaft bracket (270) having a fifth insertion hole into which the other end of the second direction of the first shaft (131) is inserted and a sixth insertion hole into which the other end of the second shaft (132) is inserted in the second direction; and A hinge assembly further comprising a second shaft bracket (650) having a seventh insertion hole (654) into which the other end of the third shaft (133) in the second direction is inserted and an eighth insertion hole (655) into which the other end of the fourth shaft (134) in the second direction is inserted.

4. In claim 3, The second gear bracket (630) is a hinge assembly that comes into contact with the surfaces of the first linkage gear (1731) and the second linkage gear (1732) facing the second direction.

5. In claim 3 or claim 4, A hinge assembly in which the second elastic assembly (120) is positioned to contact the surface of the second shaft bracket (650) facing the second direction.

6. In any one of claims 1 to 5, A hinge assembly, wherein the first elastic assembly (110) comprises a first elastic member (111) formed to surround at least a portion of the first shaft (131), a second elastic member (112) formed to surround at least a portion of the second shaft (132), a third elastic member (113) formed to surround at least a portion of the third shaft (133), and a fourth elastic member (114) formed to surround at least a portion of the fourth shaft (134).

7. In any one of claims 1 to 6, A hinge assembly, wherein the second elastic assembly (120) includes elastic members (123, 124) formed to surround at least a portion of each of the third shaft (133) and the fourth shaft (134).

8. In any one of claims 3 to 5, A hinge assembly further comprising a fixing member (670) set to fix the second shaft bracket (650) to the third shaft (133) and the fourth shaft (134).

9. In claim 1 or claim 2, A hinge assembly in which a first step portion (1331) on which the second gear bracket (630) is mounted is formed on the first end of the third shaft (133) and the first end of the fourth shaft (134).

10. In claim 9, A second step (1333) is formed at the other end of the third shaft (133) and the other end of the fourth shaft (134) on which the second shaft bracket (650) is mounted, and / or A hinge assembly, wherein the first step portion (1331) includes a first portion formed with a first diameter and at least a portion of which is inserted into the third insertion hole (634) and a second portion formed to face the second direction-facing surface of the second gear bracket (630) and formed with a second diameter larger than the first diameter.

11. In any one of claims 1 to 10, At least a portion of the second elastic assembly (120) further includes a fixing member (670) that is in contact with the third shaft (133) and the fourth shaft (134), A hinge assembly in which the elastic force generated from the second elastic assembly (120) is transmitted to the third shaft (133) and the fourth shaft (134) through the fixing member (670).

12. In any one of claims 1 to 11, A first step structure is formed on one end of the first direction of the third shaft (133) on which the first linkage gear (1731) is mounted, A hinge assembly in which a second step structure is formed on one end of the first direction of the fourth shaft (134) on which the second linkage gear (1732) is mounted.

13. In claim 2, The second elastic assembly (120) includes a first elastic body (153) formed to surround at least a portion of the third shaft (133) and a second elastic body (154) formed to surround at least a portion of the fourth shaft (134). A hinge assembly in which the first elastic body (153) and the second elastic body (154) are arranged to face the surface of the second gear bracket (630) facing the second direction.

14. In any one of claims 1 to 13, A hinge assembly in which the elastic force transmitted from the first elastic assembly (110) to the first cam member (560) is set to be greater than the elastic force transmitted from the second elastic assembly (120) to the third shaft (133) and the fourth shaft (134).

15. In a foldable electronic device (200), At least one hinge assembly (240, 240-1) according to any one of claims 1 to 14; and A foldable electronic device comprising a first housing (210) and a second housing (220) formed to be foldable around at least one hinge assembly (240, 240-1).

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