Hinge structure including elastic member and foldable electronic device including the same

Abstract

A foldable electronic device according to an embodiment of the disclosure includes a hinge structure, wherein the hinge structure includes: a cam member including first to fourth fixed cam portions facing first to fourth cams coupled with first to fourth shafts; first and second elastic members coupled with the first and second shafts so as to provide first elastic force to the first and second cams; and third and fourth elastic members coupled with the third and fourth shafts so as to provide second elastic force to the third and fourth cams, and the hinge structure is formed such that a slope of the first cam is different from a slope of the third cam, and a type of the first elastic member is different from a type of the third elastic member.

Description

Technical Field

[0001] Various embodiments of this disclosure relate to hinge structures including elastic members. Background Technology

[0002] Portable electronic devices, such as smartphones, can support calling functions as well as search and content delivery capabilities based on various types of applications. In providing these functions, the portable electronic device can output a screen corresponding to the function. When using these functions, users may desire a wider screen. In typical portable electronic devices, expanding the display to show the screen increases the overall size of the display, which may reduce portability. Therefore, foldable electronic devices are configured such that the screen size can be increased while maintaining portability. Foldable electronic devices can have both a folded and an unfolded state. Summary of the Invention

[0003] Technical solution A foldable electronic device (or portable electronic device, portable communication device, foldable electronic device, or foldable electronic device with communication function, foldable portable electronic device) according to various embodiments of the present disclosure includes: a first housing and a second housing; a hinge structure connected between the first housing and the second housing; and a flexible display housed in the first housing and the second housing, the hinge structure including: a first rotating member and a second rotating member, the first rotating member being connected to the first housing and the second rotating member being connected to the second housing; a first arm member and a second arm member, the first arm member rotating in response to rotation of the first rotating member and the second arm member rotating in response to rotation of the second rotating member; a first shaft, a first main gear disposed on the first shaft and connected to the first arm member; a second shaft, a second main gear disposed on the second shaft and connected to the second arm member; and a third shaft, a third shaft disposed between the first main gear and the second main gear, and... A first gear is mounted on a third shaft; a fourth shaft is mounted between the third shaft and the second main gear, and a second gear is mounted on the fourth shaft; a first cam to a fourth cam are respectively connected to the first shaft to the fourth shaft; a cam member is connected to each of the first shaft to the fourth shaft and includes a first fixed cam portion to a fourth fixed cam portion respectively facing the first cam to the fourth cam; a first elastic member is connected to the first shaft and provides a first elastic force to the first cam; a second elastic member is connected to the second shaft and provides a first elastic force to the second cam; a third elastic member is connected to the third shaft and provides a second elastic force to the third cam, different from the first elastic force; a fourth elastic member is connected to the fourth shaft and provides a second elastic force to the fourth cam, wherein the slope of the first cam is different from the slope of the third cam, and the type of the first elastic member is different from the type of the third elastic member.

[0004] In addition, this disclosure presents various embodiments. Attached Figure Description

[0005] Figure 1 This is a view showing an example of the appearance of a foldable electronic device in a folded state according to an embodiment.

[0006] Figure 2 This is an exploded perspective view of a foldable electronic device according to an embodiment.

[0007] Figure 3 This is a view showing an example of an exploded perspective view of a hinge structure according to an embodiment when viewed in a first direction.

[0008] Figure 4This is an example view showing an exploded perspective view of the hinge structure according to an embodiment when viewed in a second direction.

[0009] Figure 5 This is a view showing an example of the state in which the components of the hinge structure according to the embodiment are connected to each other in a first direction.

[0010] Figure 6 This is a view showing, in a second direction, an example of the state in which the components of the hinge structure according to the embodiment are connected to each other.

[0011] Figure 7 This is a view illustrating an example of the cam member and the form of the cam in a hinge structure according to an embodiment.

[0012] Figure 8 This is a view illustrating the torque variation during the unfolding and folding of the hinge structure according to an embodiment.

[0013] Figure 9 This is a view illustrating an example of a cam member and another form of cam in a hinge structure according to an embodiment.

[0014] Figure 10 It shows the unfolding and folding Figure 9 A view showing the torque change during the process of the hinge structure shown.

[0015] Figure 11 This is a view illustrating an example of a hinge structure in which the position of the cam member and the cam is changed according to an embodiment.

[0016] Figure 12 This is a view illustrating an example of a hinge structure in which the position of the cam is changed according to an embodiment.

[0017] Figure 13 This is a view showing an example of a cam pattern according to an embodiment.

[0018] Figure 14 This is a block diagram of an electronic device in a network environment according to various embodiments. Detailed Implementation

[0019] In the following description, various embodiments of the present disclosure will be described with reference to the accompanying drawings.

[0020] In the following, various embodiments of this disclosure propose a hinge structure and a foldable electronic device including the hinge structure. The frictional force (or torque) required for hinge operation of a foldable electronic device of a certain size or larger can be provided by applying different types of elastic members, and additionally or alternatively, the unfolding operation or folding operation or flexing operation (operation of supporting the foldable electronic device so that it is temporarily fixed at a certain holding angle (e.g., an angle greater than 0 degrees and less than 180 degrees) of the foldable electronic device can be firmly supported.

[0021] According to various embodiments of this disclosure, the hinge structures and foldable electronics can provide sufficient hinge performance even for larger electronic devices with increased weight and size. For example, the hinge structures and foldable electronics of this disclosure can provide sufficient torque and consistent detent force when opening and closing the electronic device, thereby providing improved device housing control.

[0022] Other intended purposes of embodiments according to this disclosure will be mentioned as needed during the description of the embodiments.

[0023] Furthermore, based on the embodiments described in detail, various purposes and effects provided by the foldable electronic device including the hinge structure according to various embodiments can be mentioned.

[0024] Figure 1 This is a view showing an example of the appearance of a foldable electronic device in a folded state according to an embodiment. Figure 2 This is an exploded perspective view of a foldable electronic device according to an embodiment.

[0025] refer to Figure 1 and Figure 2 The foldable electronic device 100 (or electronic device, portable electronic device, portable communication device, foldable electronic device, portable device, or foldable portable electronic device) according to an embodiment includes a first housing 110, a second housing 120, a hinge housing 150, wing panels 131 and 132 (or plates (optional)), a display 160 (or flexible display), and at least one hinge structure 200a, 200b, and 200c (or hinge structure, hinge assembly, gear assembly). In the foldable electronic device 100, the wing panels 131 and 132 may be removed or may be attached to another structure (e.g., display 160) or integrally formed with another structure (e.g., display 160). Additionally or alternatively, the foldable electronic device 100 may also include an auxiliary display 160a and a camera, and additionally, may include structures disposed on one side of the housing and related to the user functions of the foldable electronic device 100, such as speaker holes and connector holes.

[0026] According to an embodiment, when the foldable electronic device 100 is in a folded state, when viewed from the front to the back of the display 160 (e.g., when viewed from the z-axis along the -z-axis direction), when at least a portion of the folded area of ​​the display 160 forms a teardrop shape (or a teardrop shape or dumbbell shape convex toward the back), it is thereby possible to ensure that cracks or buckling of the fold R (curvature) in the folded area of ​​the display 160 are prevented. Furthermore, in the foldable electronic device 100, when the foldable electronic device 100 is in a folded state, by setting the dumbbell-shaped folded area of ​​the display 160 in a specific space between the housings 110 and 120, the clearance between the housings 110 and 120 can be maintained at a standard value or smaller, or maintained as an 11-shaped shape. According to the above-described foldable electronic device 100, at least one support structure can be provided at at least a portion of the housings 110 and 120 and the hinge housing 150, thereby preventing or mitigating damage to the internal structure of the foldable electronic device 100 by preventing the hinge housing 150 from moving into the interior of the housings 110 and 120 when an external impact is applied to the foldable electronic device 100.

[0027] According to an embodiment, the first housing 110 is connected to the second housing 120 using at least one hinge structure 200a, 200b, and 200c. The first housing 110 may include: a first bottom region 110_bot in which the display 160 is disposed; sidewalls (e.g., 110a, 110b, and 110c) disposed at the outer periphery of the first bottom region 110_bot and surrounding the outer periphery of the display 160 or the outer periphery of the region where the display 160 is disposed; or a separately provided frame. As an example, the first housing 110 may include: a first sidewall 110a disposed at the opposite outer periphery of a first side 110d facing the second housing 120 in a direction perpendicular to the length direction of the first side 110d; a second sidewall 110b extending from one end of the first sidewall 110a and disposed parallel to the first side 110d; and a third sidewall 110c disposed at one end of the second sidewall 110b parallel to the first sidewall 110a. The first sidewall 110a, second sidewall 11b, and third sidewall 110c can be formed to protrude upwards (e.g., in the z-axis direction) from the bottom surface of the first bottom region 110_bot by a pre-designed height. At least a portion of the first side 110d can have an engraved shape with a specific curvature downwards (e.g., in the -z-axis direction) from the bottom surface of the first bottom region 110_bot, allowing at least a portion of the hinge housing 150 to be disposed. Alternatively, a rear cover can be disposed on the rear surface of the first housing 110. Here, the rear cover can be omitted. At least a portion of the first housing 110 can be adhered to the first region 161 of the display 160. Alternatively, a portion of the outer periphery of the front surface of the first housing 110 can be adhered to at least a portion of the outer periphery of the first region 161 of the display 160. In this regard, an adhesive layer can be disposed between the front surface of the first housing 110 and the first region 161 of the display 160.

[0028] According to an embodiment, at least a portion of the interior of the first housing 110 may be provided in a hollow (or empty) form. At least one of at least a circuit board, at least one battery, and at least a portion of at least one camera module may be disposed within the interior of the first housing 110. The circuit board and battery disposed in the first housing 110 may be electrically connected via a flexible plate (not shown) to at least one circuit board and at least one battery disposed within the interior of the second housing 120. For example, the flexible plate (not shown) may extend across a hinged housing 150 from a portion of the first housing 110 to a portion of the second housing 120. For example, a processor and a memory may be disposed within the circuit board disposed in the first housing 110.

[0029] According to an embodiment, at least a portion of the first housing 110 may be formed of a metallic material, or at least a portion of the first housing 110 may be formed of a non-metallic material. The first housing 110 may be formed of a material having a specific strength level to support at least a portion of the display 160. In an embodiment, when the foldable electronic device 100 is in the unfolded state, at least a portion of the first side 110d of the first housing 110 facing the second housing 120 may include a recessed portion, at least a portion of which is recessed so that the hinge housing 150 can be disposed therein.

[0030] According to an embodiment, the first housing 110 is connected to at least one hinge structure 200a, 200b, and 200c, and can be rotated clockwise or counterclockwise by externally applied pressure to move from any point between the -x-axis and the x-axis to any point between the z-axis and the -z-axis. In the folded state of the foldable electronic device 100, the first housing 110 may be arranged parallel to the z-axis or parallel to the second housing 120. When the first housing 110 is arranged parallel to the second housing 120 (or in the folded state of the foldable electronic device 100), at least a portion of the three sidewalls (or edges or outer peripheries) of the first housing 110 (e.g., a portion of the outer periphery adjacent to the second housing 120 in the unfolded state of the foldable electronic device) may contact, face, or be adjacent to the three sidewalls of the second housing 120 (or the remaining edges of the foldable electronic device 100 other than the second side adjacent to the first side of the first housing 110 in the unfolded state).

[0031] According to an embodiment, the second housing 120 is connected (or fastened, coupled) to the first housing 110 via at least one hinge structure 200a, 200b, and 200c. The second housing 120 may include a front surface and a frame on which at least a portion of the display 160 (e.g., the second region 162) is disposed, and the frame surrounds at least a portion of the front surface or the edge of the second region 162 of the display 160. At least a portion of the second housing 120 may be adhered to the second region 162 of the display 160. Alternatively, a portion of the outer periphery of the front surface of the second housing 120 may be adhered to the outer periphery of the second region 162 of the display 160. In this regard, an adhesive layer may be disposed between the front surface of the second housing 120 and the second region 162 of the display 160.

[0032] According to an embodiment, similar to the first housing 110, the second housing 120 may have a hollow portion at least partially inside. At least one circuit board and at least one battery may be disposed inside the second housing 120. Alternatively, at least one battery may be disposed in either the first housing 110 or the second housing 120, or in both. At least one of the printed circuit board or battery disposed in the second housing 120 may be electrically connected via a flexible plate to a component disposed in the first housing 110 (e.g., at least one of the printed circuit board or battery).

[0033] According to an embodiment, similar to the first housing 110, at least a portion of the second housing 120 may be formed of a metallic material, or at least a portion of the second housing 120 may be formed of a non-metallic material. The second housing 120 may be formed of a material having a specific strength level to support at least a portion of the display 160. The sidewall structure of the second housing 120 may be formed corresponding to the sidewall structure of the first housing 110. In an embodiment, in the unfolded state of the foldable electronic device 100, the second housing 120 may include a second side portion facing the first housing 110 (or a portion adjacent to the first housing 110) and fourth to sixth sidewalls surrounding the second side portion. The second side portion may include a recessed portion (e.g., a recessed portion) in which at least a portion is recessed, allowing the hinge housing 150 to be disposed therein. The recessed portion of the second housing 120 may be disposed adjacent to the recessed portion of the first housing 110. A rear cover may be disposed on the rear surface of the second housing 120. Here, the rear cover may be omitted.

[0034] According to an embodiment, at least a portion of the display 160 may be flexible. For example, the display 160 may include: a first region 161, at least a portion of which is disposed on the first housing 110; a second region 162, at least a portion of which is disposed on the second housing 120; and a third region 163 (or a folded region or a folded area), at least a portion of which is disposed between the first region 161 and the second region 162. As an example, in the folded or unfolded state of the foldable electronic device 100, at least a portion of the first region 161 and the second region 162 may be disposed in a flat state, and in the folded state of the foldable electronic device 100, at least a portion of the third region 163 may be bent. For example, regardless of the state of the foldable electronic device 100 (change in the position of the flat surface), the first region 161 and the second region 162 may remain in a flat state, and the third region 163 may deform into a bent state or a flat state corresponding to the state of the foldable electronic device 100. For example, in the unfolded state of the foldable electronic device 100, the third region 163 may be in a planar state (or flat state), and in the folded state of the foldable electronic device 100, at least a portion of the third region 163 may be in a bent state (or deflected state).

[0035] According to an embodiment, the display 160 may include at least some of a variety of layers. For example, the display 160 may include at least some of the following: an outer protective layer (or glass layer or polymer layer) having a specific level of transparency and a specific size; a display panel layer disposed below the outer protective layer for displaying an image; and at least one first rear layer disposed below the display panel layer, regardless of their order. The first rear layer (or rear panel or rear portion) may include at least one of an impact-absorbing layer (or imprinted layer), a heat dissipation layer (or a metal sheet layer, metal layer, or conductive sheet) (or a layer other than at least one of the aforementioned layers). Additionally or alternatively, the first rear layer may also include an electromagnetic induction panel (e.g., a digitizer). The display 160 may also include a second rear layer disposed below the first rear layer. The second rear layer (or rear panel or rear portion) may include at least one metal layer (or metal sheet), at least a portion of which is formed of a metallic material. The second rear layer may include a specific pattern (e.g., a grid pattern or a slit pattern) such that at least a portion of the second rear layer is bendable. Alternatively, at least a portion of the second rear layer may be formed of another bendable material (e.g., a polymer material, rubber, or leather material). At least one of the first and second back layers can be omitted.

[0036] At least some of the hinge structures 200a, 200b, and 200c may be disposed in the hinge housing 150, and at least some of the hinge structures 200a, 200b, and 200c may have similar structures and shapes to each other. Alternatively, at least some of the hinge structures 200a, 200b, and 200c may have structures and shapes different from the remaining hinge structures. Alternatively, all three hinge structures 200a, 200b, and 200c may have the same or similar structures and may be disposed in different orientations. Meanwhile, the accompanying drawings show three hinge structures 200a, 200b, and 200c disposed, and two or four or more hinge structures may be disposed in the foldable electronic device 100.

[0037] Wings 131 and 132 are positioned on or connected to at least one hinge structure 200a, 200b, and 200c to cover the surfaces of at least one hinge structure 200a, 200b, and 200c in the z-axis direction when the foldable electronic device 100 is in the unfolded state. Wings 131 and 132 may be separately disposed from housings 110 and 120. Therefore, a gap may be formed between wings 131 and 132 and housings 110 and 120. Wings 131 and 132 may be configured to correspond to at least a portion of the lower surface (e.g., the surface in the z-axis direction) of the third region 163 of the display 160. Wings 131 and 132 rotate clockwise or counterclockwise according to the hinge operation of at least one hinge structure 200a, 200b, and 200c. For example, when the first wing plate 131 rotates counterclockwise, the second wing plate 132 can rotate clockwise, and when the first wing plate 131 rotates clockwise, the second wing plate 132 can rotate counterclockwise. The first wing plate 131 can support the flat first surface of the third region 163 of the display 160, which is folded into a dumbbell shape, and the second wing plate 132 can support the flat second surface of the third region 163 of the display 160, which is folded into a dumbbell shape (a surface symmetrical to the first surface relative to the z-axis).

[0038] In the aforementioned foldable electronic device 100, at least one of the plurality of hinge structures 200a, 200b, and 200c may include different types of elastic members to provide the torque (or frictional force) required during the folding or unfolding operation of the foldable electronic device 100. Additionally or alternatively, the cam structure (e.g., cam member and cam) of at least one of the plurality of hinge structures 200a, 200b, and 200c may be configured in different ways to support stable and secure changes or support operations during operation while supporting at least one of the following operations: operation from folded state to unfolded state, operation from unfolded state to folded state, and flex operation of the foldable electronic device 100.

[0039] Figure 3 This is a view showing an example of an exploded perspective view of a hinge structure according to an embodiment when viewed in a first direction. Figure 4 This is an example view showing an exploded perspective view of the hinge structure according to an embodiment when viewed in a second direction. Figure 5 This is a view showing an example of the state in which the components of the hinge structure according to the embodiment are connected to each other in a first direction. Figure 6 This is a view showing an example of the state in which the components of the hinge structure according to the embodiment are connected to each other in the second direction.

[0040] Figures 3 to 6 The hinge structure 201 shown can correspond to the above in Figure 2 At least one of the plurality of hinge structures 200a, 200b and 200c described herein. Alternatively, at least some of the elastic members and cam shapes of hinge structure 201 (which will be described below) may be applied to at least one of the plurality of hinge structures 200a, 200b and 200c.

[0041] Reference Figures 1 to 4 The hinge structure 201 (or gear assembly) may include a fixed bracket 213 (or a support bracket or support member), a first rotating member 211 (or a first rotating bracket), a second rotating member 212 (or a second rotating bracket), a first arm member 221 (or a first arm or a first arm structure), a second arm member 222 (or a second arm or a second arm structure), a first link member 215, a second link member 216, a third link member 223, or a fourth link member 224.

[0042] According to the embodiments, refer to Figure 5The hinge structure 201 can be classified as a configuration including a torque structure 230_tr and a gear interlock structure 220_ge. The torque structure 230_tr provides friction during the unfolding or folding operation of the rotating hinge structure 201 (e.g., the elasticity providing structure 242, the cam connection structure 244, the first surface pressure structure 249_1, and the second surface pressure structure 249_2). As an example, the elasticity providing structure 242 may include a first cam elastic member 242a (or a first elastic member or a first elastic body) and a second cam elastic member 242b (or a second elastic member or a second elastic body) of a first type, and a third cam elastic member 242c (or a third elastic member or a third elastic body) and a fourth cam elastic member 242d (or a fourth elastic member or a fourth elastic body) of a second type, different from the first type. The cam connection structure 244 (or cam structure) may include: a cam member 241, in which a plurality of fixed cam portions 241a, 241b, 241c, and 241d are disposed; and a plurality of cams 244a, 244b, 244c, and 244d, which are cam-connected to the fixed cam portions 241a, 241b, 241c, and 241d of the cam member 241. The first surface pressure structure 249_1 may include: a first friction member 249a1 and a third friction member 249b1, which are disposed between one side of the first support member 248a and one side of the second support member 248b; and support members 248a and 248b. The second surface pressure structure 249_2 may include: a second friction member 249a2 and a fourth friction member 249b2, which are disposed between the opposite sides of the first support member 248a and the opposite sides of the second support member 248b; and support members 248a and 248b.

[0043] In addition, refer to Figure 6The hinge structure 201 performs hinge operations around its axes. For example, the hinge structure 201 may include: a first axis, axis_A1, which is the rotation center of the first rotating member 211 inserted into the fixed bracket 213; a second axis, axis_A2, which is the rotation center of the second rotating member 212 inserted into the fixed bracket 213; a third axis, axis_B3, which is the rotation center of the first axis 231 connected to the first arm member 221; a fourth axis, axis_B4, which is the rotation center of the second axis 232 connected to the second arm member 222; a fifth axis, axis_A3, which is the rotation center of the outer peripheral portion of the first rotating member 211 connected to the first link member 215; and a sixth axis, axis_A4, which is connected to the second link member 215. The rotation center of the outer periphery of the second rotating member 212 of member 216; the seventh axis, axis_B1, which is the rotation center of the first arm member 221 connected to the third link member 223; the eighth axis, axis_B2, which is the rotation center of the second arm member 222 connected to the fourth link member 224; the ninth axis, axis_B5, which corresponds to the rotation center of the first gear shaft 238, on which the first gear 238a (or the first interlocking gear or the first idler gear) is disposed; and the tenth axis, axis_B6, which corresponds to the rotation center of the second gear shaft 239, on which the second gear 239a (or the second interlocking gear or the second idler gear) is disposed.

[0044] At the same time, at least some components of the aforementioned hinge structure 201 (e.g., at least some of the first link member 215, the second link member 216, the third link member 223, and the fourth link member 224) can be omitted. For example, when the first rotating member 211 and the second rotating member 212 are directly connected to the housings 110 and 120 ( Figure 2 When arm members 221 and 222 are connected to rotating members 211 and 212, arm members 221 and 222 can rotate in response to rotation of rotating members 211 and 212. According to an embodiment, at least some of the first link member 215, the second link member 216, the third link member 223, and the fourth link member 224 can be integrally formed. For example, the first link member 215 and the third link member 223 can be integrally formed, and the second link member 216 and the fourth link member 224 can be integrally formed. Alternatively, at least some of the first link member 215, the second link member 216, the third link member 223, and the fourth link member 224 can be integrally formed with the housing.

[0045] The hinge structure 201 according to an embodiment of the present disclosure includes: a first main gear 221_2 (or a first gear or a first shaft gear) formed (or disposed) in a first arm member 221; a second main gear 222_2 (or a second gear or a second shaft gear) formed (or disposed) in a second arm member 222; and at least one interlocking gear 238a and 239a (or idler gear or auxiliary gear (optional)) disposed between the first main gear 221_2 and the second main gear 222_2. At least one interlocking gear 238a and 239a may be disposed on gear shafts 238 and 239 (or shafts), respectively. For example, the first gear 238a may be disposed (or formed) on the first gear shaft 238 (or the first gear shaft, the first interlocking shaft, the first gear shaft, the first auxiliary shaft, or the third shaft). The second gear 239a may be disposed (or formed) on the second gear shaft 239 (or the second gear shaft, the second gear shaft, the second auxiliary shaft, or the fourth shaft). In embodiments of this disclosure, a gear shaft may refer to a rod-shaped portion on which a gear body including gear teeth is disposed. Alternatively, a shaft may refer to a shaped portion protruding from the gear body portion along the rotation axis of the gear.

[0046] In the following text, reference will be made to Figures 1 to 6To describe the components of hinge structure 201. The hinge structure 201 according to the embodiment may include: a first main gear 221_2 and a second main gear 222_2; a gear bracket 236 (or a stop, arm support structure, shaft support structure, gear frame, gear support member, or support member) for fixing at least one interlocking gear 238a and 239a and preventing the first arm member 221 and the second arm member 222 from rotating more than a certain angle; a shaft fixing part 243 for fixing the first shaft 231 and the second shaft 232; a cam member 241, wherein a plurality of fixed cam portions 241a, 241b, 241c and 241d are provided; a plurality of cams 244a, 244b, 244c and 244d, whose cams are connected to the fixed cam portions 241a, 241b, 241c and 241d of the cam member 241; a first cam elastic member 242a (or a first elastic member, a first elastic body, a first cam elastic body); and a second cam elastic member 242b (or a second elastic member, a second elastic body, a second cam). The system includes an elastic body, a third cam elastic component 242c (or a third elastic component, a third elastic body, and a third cam elastic body), and a fourth cam elastic component 242d (or a fourth elastic component, a fourth elastic body, and a fourth cam elastic body), which respectively provide elastic force to multiple cams 244a, 244b, 244c, and 244d; multiple friction components 249a1, 249a2, 249b1, 249b2, 249c1, 249c2, 249c3, and 249c4; and a support. Support members 248a, 248b, and 248c, at least one surface of which faces a plurality of friction members 249a1, 249a2, 249b1, 249b2, 249c1, 249c2, 249c3, and 249c4, and which support the plurality of friction members 249a1, 249a2, 249b1, 249b2, 249c1, 249c2, 249c3, and 249c4; and fixing nuts 249d1 and 249d2 (or fixing members, or fixing bodies). According to an embodiment, gear bracket 236 may include a fixing structure for fixing at least one of the first shaft 231, the second shaft 232, the first gear shaft 238, and the second gear shaft 239.

[0047] According to an embodiment, the fixing bracket 213 may include, for example, an upper fixing bracket 213a and a lower fixing bracket 213b. The upper fixing bracket 213a and the lower fixing bracket 213b may be connected to each other by connecting members 213c1, 213c2 and 213c3 (e.g., connecting screws). The upper fixing bracket 213a and the lower fixing bracket 213b may be formed of the same material (e.g., metal).

[0048] At least a portion of the upper surface (e.g., the surface in the z-axis direction) of the upper fixing bracket 213a may be configured as a flat shape. According to an embodiment, at least a portion of the cross-section of the upper fixing bracket 213a from the upper surface (e.g., the surface in the z-axis direction) toward the lower surface (e.g., the surface in the -z-axis direction) may include an arcuate shape (or a curved surface). The upper fixing bracket 213a may include an upper fixing bracket end 213a3, a lower fixing bracket end 213a4, a first track 213a1 (or a first track structure inserted into a protruding track), a second track 213a2 (or a second track structure inserted into a protruding track), and a fixing bracket extension 213a5.

[0049] At least a portion of the upper surface of the upper end 213a3 of the fixed bracket may be formed to be flat, and it may include at least one hole or recess for fastening to the lower fixed bracket 213b. The upper end 213a3 of the fixed bracket may define the sidewalls of the first track 213a1 and the second track 213a2. As an example, portions of the tracks of the track structures coupled to the first rotating member 211 and the second rotating member 212 may be respectively disposed in one sidewall of the upper end 213a3 of the fixed bracket (e.g., one sidewall facing the y-axis direction). At least a portion of the upper end 213a3 of the fixed bracket may be formed to cover at least a portion of the upper part of the first track 213a1 and the second track 213a2. At least a portion of the upper end 213a3 of the fixed bracket may prevent the first rotating member 211 and the second rotating member 212 connected to the first track 213a1 and the second track 213a2 from deviating from the first track 213a1 and the second track 213a2.

[0050] The lower end 213a4 of the fixed bracket can be positioned at a specific distance (e.g., the width of the first rotating member 211 or the second rotating member 212, e.g., the y-axis length) from the upper end 213a3 of the fixed bracket, and can be connected to the upper end 213a3 of the fixed bracket via the first track 213a1 and the second track 213a2. The upper surface of the lower end 213a4 of the fixed bracket (e.g., the surface facing the z-axis) can be formed to be flat. One sidewall of the lower end 213a4 of the fixed bracket (e.g., the sidewall facing the -y-axis) can be positioned facing the upper end 213a3 of the fixed bracket and can support the side portions of the first rotating member 211 and the second rotating member 212 inserted into the first track 213a1 and the second track 213a2. The portions of the tracks 213a1 and 213a2 connected to the track structures of the first rotating member 211 and the second rotating member 212 can be disposed in one sidewall of the lower end 213a4 of the fixed bracket. The grooves (or holes) into which the shafts (e.g., first shaft 231, second shaft 232, first gear shaft 238 and second gear shaft 239) can be inserted can be formed in the opposite sidewalls (e.g., the sidewall facing the y-axis direction) of the lower end 213a4 of the fixed bracket.

[0051] The fixing bracket extension 213a5 can be configured to protrude toward one end of the fixing bracket lower end 213a4 (e.g., from the outer periphery of the fixing bracket lower end 213a4 in the y-axis direction). The thickness of the fixing bracket extension 213a5 can be formed to be less than the thickness of the fixing bracket lower end 213a4, and the length of the fixing bracket extension 213a5 in the x-axis direction can be less than its length in the y-axis direction. The fixed bracket extension 213a5 may be configured to cover at least some of the shafts 231, 232, 238 and 239; at least some of the first main gear 221_2, the second main gear 222_2, the first gear 238a and the second gear 239a; and support members 218a, 218b and 218c and a plurality of friction members 249a1, 249a2, 249b1, 249b2, 249c1, 249c2, 249c3 and 249c4, cam member 241, cams 244a, 244b, 244c and 244d, cam elastic members 242a, 242b, 242c and 242d, and at least some of the shaft fixing portions 243. The fixed bracket extension 213a5 can prevent the aforementioned components (e.g., at least some of shafts 231, 232, 238, and 239; at least some of the first main gear 221_2, the second main gear 222_2, the first gear 238a, and the second gear 239a; and support members 218a, 218b, and 218c, and a plurality of friction members 249a1, 249a2, 249b1, 249b2, 249c1, 249c2, 249c3, and 249c4, cam member 241, cams 244a, 244b, 244c, and 244d, and at least some of the cam elastic members 242a, 242b, 242c, and 242d) from deviating. The fixed bracket extension 213a5 may include at least one connecting hole that can be connected to at least one of the cam member 241 and the shaft fixing portion 243.

[0052] The first track 213a1 and the second track 213a2 can be disposed between the upper end 213a3 and the lower end 213a4 of the fixed bracket. According to an embodiment, a portion of the first track 213a1 can be disposed on the side wall of the upper end 213a3 of the fixed bracket, and another portion of the first track 213a1 can be disposed on the side wall of the lower end 213a4 of the fixed bracket. The bottom surface of the first track 213a1 may include a curved surface with a shape similar to a portion of the surface of the first rotating member 211 facing the -z-axis direction. A portion of the second track 213a2 can be disposed on the side wall of the upper end 213a3 of the fixed bracket, and another portion of the second track 213a2 can be disposed on the side wall of the lower end 213a4 of the fixed bracket. The bottom surface of the second track 213a2 may include a curved surface with a shape similar to a portion of the surface of the second rotating member 212 facing the -z-axis direction. At least a portion of the second track 213a2 can be connected to the first track 213a1. (Refer to...) Figure 6 The first track 213a1 can support the mounted first rotating member 211, allowing the first rotating member 211 to rotate along a first axis axis_A1 (or a virtual first axis serving as the center of a sliding operation along the track). The second track 213a2 can support the mounted second rotating member 212, allowing the second rotating member 212 to rotate along a second axis axis_A2 (or a virtual second axis serving as the center of a sliding operation along the track). According to an embodiment, the first axis axis_A1 and the second axis axis_A2 can be formed to be spaced apart from each other by a specific interval. The first axis axis_A1 and the second axis axis_A2 can be formed on the upper side (in the air) of the upper surface of the fixed bracket 213 (e.g., the surface in the z-axis direction). Alternatively, the first axis axis_A1 and the second axis axis_A2 can be formed on the display 160 ( Figure 2The first axis (axis_A1) and the second axis (axis_A2) are formed between the upper surface of the fixed support body 213a and the lower surface of the fixed support body 213a (e.g., the surface in the -z-axis direction). As an example, the first axis (axis_A1) and the second axis (axis_A2) may be formed in the air above the upper surface of the fixed support body 213a (e.g., the surface in the -z-axis direction). According to an embodiment, the interval between the first axis (axis_A1) and the second axis (axis_A2) may be different from the interval between the third axis (axis_B3) defined by the first axis (231) and the fourth axis (axis_B4) defined by the second axis (232). As an example, the interval between the first axis (axis_A1) and the second axis (axis_A2) may be smaller than the interval between the third axis (axis_B3) and the fourth axis (axis_B4). According to an embodiment, the first axis (axis_A1) and the second axis (axis_A2) may be formed above the third axis (axis_B3) and the fourth axis (axis_B4) relative to the z-axis. Alternatively, the first axis_A1 and the second axis_A2 can be positioned closer to the display 160° relative to the z-axis than the third axis_A3 and the fourth axis_A4. Figure 2 The upper surface of ).

[0053] At least a portion of the shape of the lower surface of the lower fixing bracket 213b (e.g., the surface in the -z-axis direction) may include a curved surface. At least a portion of the shape of the upper surface of the lower fixing bracket 213b (e.g., the surface facing the z-axis direction) may be configured as concave (or convex in the -z-axis direction). For example, at least a portion of the lower surface of the lower fixing bracket 213b may be formed corresponding to the hinge housing 150 ( Figure 2 The lower fixed bracket 213b can be fastened to the upper fixed bracket 213a via connecting members 213c1, 213c2, and 213c3. The lower fixed bracket 213b can be used to support the sides of the first rotating member 211 and the second rotating member 212 connected to the upper fixed bracket 213a. At least one recess or hole for connecting to, fastening to, or aligning with the upper fixed bracket 213a can be formed at least a portion of the lower fixed bracket 213b, and the upper fixed bracket 213a can include at least one groove or at least one protruding structure inserted into the recess formed in the lower fixed bracket 213b. As an example, the length of the lower fixed bracket 213b in the y-axis direction can be similar to the lengths of the upper fixed bracket 213a3, the first track 213a1, the second track 213a2, and the lower fixed bracket 213a4 in the assembly of the upper fixed bracket 213a.

[0054] According to an embodiment, the first rotating member 211 may be fastened to one side of the fixed bracket 213 (e.g., the first track 213a1) to perform a hinge operation. In this regard, the first rotating member 211 may include a first upper rotating body 211_1, a first lower rotating body 211_2, a first rotating elastic body 211_3 (or an elastic body or elastic member of the first rotating member 211).

[0055] The first upper track structure 211_1a can be formed on one side (e.g., the outer periphery of the -x axis) of the first upper rotating body 211_1, and the first upper connecting rod connection portion 211_1b can be formed on the opposite side (e.g., the outer periphery of the x axis) of the first upper rotating body 211_1. The first lower track structure 211_2a can be formed on one side (e.g., the outer periphery of the -x axis) of the first lower rotating body 211_2, and the first lower connecting rod connection portion 211_2b can be formed on the opposite side (e.g., the outer periphery of the x axis) of the first lower rotating body 211_2. The first rotational elastic body 211_3 can be disposed between the first upper rotating body 211_1 and the first lower rotating body 211_2, and can apply elastic force to push the first upper rotating body 211_1 and the first lower rotating body 211_2 in the -y axis or y axis direction, respectively. With this structure, the first upper rotating body 211_1 and the first lower rotating body 211_2 can be more firmly connected to the first track 213a1 of the upper fixed bracket 213a, and are less likely to deviate from the first track 213a1.

[0056] The first upper track structure 211_1a and the first lower track structure 211_2a can be positioned symmetrically with the first rotational elastic body 211_3 positioned between them. A side portion of the first upper track structure 211_1a can be connected to one side of the first track 213a1 (e.g., the portion of the first track 213a1 located in the upper end 213a3 of the fixed bracket), and a side portion of the first lower track structure 211_2a can be connected to the opposite side of the first track 213a1 (e.g., the other portion of the first track 213a1 located in the lower end 213a4 of the fixed bracket). The bottom surfaces of the first upper track structure 211_1a and the first lower track structure 211_2a can be configured to face the bottom surface of the first track 213a1.

[0057] The first upper link connecting portion 211_1b includes a hole passing through the -y axis in the y-axis direction, and the second upper link connecting portion 212_1b may include a hole passing through the -y axis in the y-axis direction and aligned to connect in the y-axis direction to the hole formed in the first upper link connecting portion 211_1b. The first upper link connecting portion 211_1b and the first lower link connecting portion 211_2b may be mounted on or fastened to the first link member 215. In this process, the holes formed in each of the first upper link connecting portion 211_1b and the second upper link connecting portion 212_1b may be used to connect the first rotating member 211 to the first link member 215.

[0058] According to an embodiment, the first rotating member 211 may experience friction with the fixed bracket 213 and the first connecting rod member 215 during repeated hinge operations, and may be formed of a material with a specific or higher strength (e.g., a metallic material) capable of withstanding such friction. Wings 131 and 132 ( Figure 2 The first wing plate 131 in ) Figure 2 Part of the hinge structure 201 can be fixed to the first rotating member 211. As an example, when the hinge structure 201 is the first hinge structure 200a ( Figure 2 When the first rotating component 211 is connected to the first wing plate 131, the first rotating component 211 can be connected to the first wing plate 131. Figure 2 ), and when hinge structure 201 is the second hinge structure 200b ( Figure 2 When the first rotating component 211 is connected to the second wing plate 132, the first rotating component 211 can be connected to the second wing plate 132. Figure 2 In this respect, the first rotating member 211 may include a means for coupling to the first wing plate 131. Figure 2 At least one hole or recess of ( ).

[0059] According to an embodiment, the second rotating member 212 can be fastened to the opposite side of the fixed bracket 213 (e.g., the second track 213a2) to perform a hinge operation. In this regard, the second rotating member 212 may include a second upper rotating body 212_1, a second lower rotating body 212_2, and a second rotating elastic body 212_3 (or an elastic body or elastic member of the second rotating member 212). According to one embodiment, at least a portion of the upper surface of the second rotating member 212 may be formed as flat. Recesses may be formed on one side of the second upper rotating body 212_1 (e.g., the side facing the y-axis direction) and one side of the second lower rotating body 212_2 (e.g., the side facing the -y-axis direction) such that a portion of the second rotating elastic body 212_3 can be inserted therein, thereby allowing the second rotating elastic body 212_3 to be located between the second upper rotating body 212_1 and the second lower rotating body 212_2. Alternatively, the recess into which the second rotating elastic body 212_3 can be inserted may be formed in a portion of the side portions of the second upper rotating body 212_1 and the second lower rotating body 212_2 adjacent to each other. This structure may include the same structure as the first rotating member 211.

[0060] The second upper track structure 212_1a may be formed on one side (e.g., the outer periphery of the -x axis) of the second upper rotating body 212_1, and the second upper connecting rod connection portion 212_1b may be formed on the opposite side (e.g., the outer periphery of the x axis) of the second upper rotating body 212_1. The second lower track structure 212_2a may be formed on one side (e.g., the outer periphery of the -x axis) of the second lower rotating body 212_2, and the second lower connecting rod connection portion 212_2b may be formed on the opposite side (e.g., the outer periphery of the x axis) of the second lower rotating body 212_2. The second rotating elastic body 212_3 may be disposed between the second upper rotating body 212_1 and the second lower rotating body 212_2 in the same or similar manner as the first rotating elastic body 211_3, and may apply elastic force to push the second upper rotating body 212_1 and the second lower rotating body 212_2 in the -y axis or y axis direction, respectively. With this structure, the second upper rotating body 212_1 and the second lower rotating body 212_2 can be more securely connected to the second track 213a2 of the upper fixed bracket 213a. In addition, when the second rotating member 212 rotates in the second track 213a2, the second rotating elastic body 212_3 can prevent the second rotating member 212 from deviating from the second track 213a2.

[0061] The second upper track structure 212_1a and the second lower track structure 212_2a can be positioned symmetrically with the second rotational elastic body 212_3 located between them. As an example, the second upper track structure 212_1a and the second lower track structure 212_2a may include track structures protruding in the -z-axis direction. This structure may have the same or similar shape as the first upper track structure 211_1a and the first lower track structure 211_2a. A side of the second upper track structure 212_1a may, for example, be connected to one side of the second track 213a2 (e.g., the portion of the second track 213a2 located at the upper end 213a3 of the fixed support), and a side of the second lower track structure 212_2a may, for example, be connected to the opposite side of the second track 213a2 (e.g., the other portion of the second track 213a2 located at the lower end 213a4 of the fixed support). The bottom surfaces of the second upper track structure 212_1a and the second lower track structure 212_2a may be configured to face the bottom surface of the second track 213a2. The second upper track structure 212_1a can be set parallel to the first upper track structure 211_1a in the x-axis direction (or set in a straight line with the first upper track structure 211_1a relative to the x-axis direction), and the second lower track structure 212_2a can be set parallel to the second upper track structure 212_1a in the x-axis direction (or set in a straight line with the second upper track structure 212_1a relative to the x-axis direction).

[0062] The second upper link connecting portion 212_1b may include a hole passing through the -y axis in the y-axis direction, and the second lower link connecting portion 212_2b may include a hole passing through the -y axis in the y-axis direction and aligned to connect in the y-axis direction to the hole formed in the second upper link connecting portion 212_1b. The second upper link connecting portion 212_1b and the second lower link connecting portion 212_2b may be mounted on or fastened to the second link member 216. In this process, the holes formed in the second upper link connecting portion 212_1b and the second lower link connecting portion 212_2b can be used to connect the second rotating member 212 to the second link member 216. A specific gap space can be formed between the second upper link connecting portion 212_1b and the second lower link connecting portion 212_2b, and the second link elastic body 216b (or the elastic body of the second link member 216) disposed in the second link member 216 can be inserted into (or disposed in) this space. Similarly, a specific gap separation space can also be formed between the first upper link connecting portion 211_1b and the first lower link connecting portion 211_2b, and the first link elastic body 215b (or the elastic body of the first link member 215) can be inserted into (or disposed in) the space between the first upper link connecting portion 211_1b and the first lower link connecting portion 211_2b. The second upper link connecting portion 212_1b and the second lower link connecting portion 212_2b can be positioned symmetrically on opposite sides (e.g., x-axis and -x-axis) relative to the fixed bracket 213. (See reference) Figure 6 The first upper link connecting portion 211_1b and the first lower link connecting portion 211_2b can be connected to the first link member 215 via the first link connecting member 215a that defines the fifth axis axis_A3. The second upper link connecting portion 212_1b and the second lower link connecting portion 212_2b can be connected to the second link member 216 via the second link connecting member 216a that defines the sixth axis axis_A4.

[0063] According to an embodiment, during repeated hinge operations similar to the first rotating member 211, the second rotating member 212 may experience friction with the fixed support 213 and the second link member 216, and may be formed of a material with a specific strength or higher (e.g., a metallic material) capable of withstanding this friction. For example, the second rotating member 212 may be formed of the same material as the first rotating member 211. Wings 131 and 132 ( Figure 2 The second wing plate 132 in ) Figure 2 Part of the hinge structure 201 can be fixed to the second rotating member 212. As an example, when the hinge structure 201 is a component of the first hinge structure 200a ( Figure 2 When the second rotating component 212 is connected to the second wing plate 132, the second rotating component 212 can be connected to the second wing plate 132. Figure 2), and when hinge structure 201 is the second hinge structure 200b ( Figure 2 When the second rotating component 212 is connected to the first wing plate 131, the second rotating component 212 can be connected to the first wing plate 131. Figure 2 In this respect, the second rotating member 212 may include a means for coupling to the second wing plate 132. Figure 2 At least one hole or recess of the first rotating member 211. The second rotating member 212 can move in the opposite direction to the first rotating member 211. For example, when the first upper track structure 211_1a and the first lower track structure 211_2a of the first rotating member 211 rotate counterclockwise (or clockwise) in place when the foldable electronic device 100 is folded (or unfolded), the second upper track structure 212_1a and the second lower track structure 212_2a of the second rotating member 212 can rotate clockwise (or counterclockwise) in place.

[0064] According to an embodiment, the first link member 215 may include being connected to and fixed to the first housing 110. Figure 2 The structure on one side of the first link member 215. The first link member 215 may include a first upper link sidewall 215_2 (or the first sidewall of the first link member 215) and a first lower link sidewall 215_3 (or the second sidewall of the first link member 215), which extend in the z-axis direction from opposite sides (e.g., the outer periphery of the -y axis and the y axis). In addition, the first link member 215 may include a first link elastic body 215b, a first link connecting member 215a, and a first link connecting ring 215c. A structure may be provided between the first upper link sidewall 215_2 and the first lower link sidewall 215_3 of the first link member 215, wherein a portion of the first rotating member 211 (e.g., the first upper link connecting portion 211_1b and the first lower link connecting portion 211_2b) is disposed (or connected, fastened, or placed), and the first link body 215_1 supports the outer periphery of the first rotating member 211 along the x-axis. The hole into which the first link connecting member 215a is inserted (e.g., a hole passing through the y-axis from the -y axis) may be formed in the first upper link sidewall 215_2, and the first lower link sidewall 215_3 may include a hole (e.g., a hole passing through the y-axis from the -y axis), into which the first link connecting member 215a is inserted, and the hole is formed at a position parallel to the hole formed in the first upper link sidewall 215_2.

[0065] With the first upper connecting part 211_1b and the first lower connecting part 211_2b of the first rotating member 211 positioned between the first upper connecting part sidewall 215_2 and the first lower connecting part sidewall 215_3, the first connecting rod elastic body 215b can be disposed in the space between the first upper connecting part 211_1b and the first lower connecting part 211_2b. The holes formed in the first upper connecting part sidewall 215_2, the first lower connecting part sidewall 215_3, the first upper connecting part 211_1b, and the first lower connecting part 211_2b can be arranged parallel in the y-axis direction, and with these holes aligned, the first connecting member 215a can be disposed to pass through these holes. Therefore, after passing through the holes formed in the first upper connecting rod sidewall 215_2, the first lower connecting rod sidewall 215_3, the first upper connecting rod connecting portion 211_1b, and the first lower connecting rod connecting portion 211_2b, and being disposed in these holes, the first connecting rod connecting member 215a can be fixed to the y-axis-facing sidewall of the first lower connecting rod sidewall 215_3 by the first connecting rod connecting ring 215c. Therefore, the first rotating member 211 (or an outer periphery of the first rotating member 211 including the fifth axis axis_A3) can rotate relative to the fifth axis axis_A3 within a specific angular range by the first connecting rod connecting member 215a. This is used to fix the first connecting rod member 215 to the first housing 110 ( Figure 2 At least one structure (e.g., a hole or recess) may be formed in at least one sidewall of the first upper link sidewall 215_2 and the first lower link sidewall 215_3. The first link member 215 may be disposed parallel to the third link member 223 along the -y axis (or y axis) direction or integrally formed with the third link member 223.

[0066] According to an embodiment, the second linkage member 216 may include being connected to and fixed to the second housing 120. Figure 2 The structure on one side of the first link member 215. Similar to the first link member 215, the second link member 216 may include a second upper link sidewall 216_2 (or a first sidewall of the second link member 216) extending along the z-axis direction from the opposite side (e.g., the -y axis and the outer periphery of the y-axis) of the second link body 216_1, and a second lower link sidewall 216_3 (or a second sidewall of the second link member 216). In addition, the second link member 216 may include a second link elastic body 216b, a second link connecting member 216a, and a second link connecting ring 216c. The second link member 216 may have a structure in which it is symmetrical with respect to the centerline of the hinge structure 201 (e.g., the horizontal centerline of the fixed bracket 213 and the centerline parallel to the y-axis) with respect to the first link member 215.

[0067] According to an embodiment, a portion of the second rotating member 212 (e.g., the second upper connecting rod connection portion 212_1b and the second lower connecting rod connection portion 212_2b) may be disposed (or connected, fastened, or positioned) between the second upper connecting rod sidewall 216_2 and the second lower connecting rod sidewall 216_3 of the second connecting rod member 216, and the second connecting rod body 216_1 may be configured to support the x-axis outer periphery of the second rotating member 212. A hole (e.g., a hole passing through the -y axis in the y-axis direction) into which the second connecting rod connecting member 216a is inserted may be formed in the second upper connecting rod sidewall 216_2, and the second lower connecting rod sidewall 216_3 may include a hole (e.g., a hole passing through the -y axis in the y-axis direction) into which the second connecting rod connecting member 216a is inserted, and the hole is formed at a position parallel to the hole formed in the second upper connecting rod sidewall 216_2.

[0068] The second upper connecting rod connecting portion 212_1b and the second lower connecting rod connecting portion 212_2b of the second rotating member 212 can be disposed between the second upper connecting rod sidewall 216_2 and the second lower connecting rod sidewall 216_3. The second connecting rod elastic body 216b can be disposed in the space between the second upper connecting rod connecting portion 212_1b and the second lower connecting rod connecting portion 212_2b. The holes formed in the second upper connecting rod sidewall 216_2, the second lower connecting rod sidewall 216_3, the second upper connecting rod connecting portion 212_1b, and the second lower connecting rod connecting portion 212_2b can be arranged parallel to each other in the y-axis direction. With these holes aligned, the second connecting rod connecting member 216a can be disposed to pass through these holes. Therefore, after passing through and being disposed in the holes formed in the second upper connecting rod sidewall 216_2, the second lower connecting rod sidewall 216_3, the second upper connecting rod connecting portion 212_1b, and the second lower connecting rod connecting portion 212_2b, one side of the second connecting rod connecting member 216a can be fixed to the y-axis-facing sidewall of the second lower connecting rod sidewall 216_3 by the second connecting rod connecting ring 216c. Therefore, the second rotating member 212 (including an outer periphery of the second rotating member 212 comprising the sixth axis axis_A4) can be rotated relative to the sixth axis axis_A4 by the second connecting rod connecting member 216a within a specific angular range. At least one structure (e.g., a hole or recess) for fixing the second connecting rod member 216 to the second housing 120 (FIG.2) can be formed in the sidewall of at least one of the second upper connecting rod sidewall 216_2 and the second lower connecting rod sidewall 216_3. The second link member 216 may be arranged parallel to the fourth link member 224 in the -y axis (or y axis) direction or integrally formed with the fourth link member 224.

[0069] According to an embodiment, the third link member 223 may include a portion of the first arm member 221 (e.g., the first arm portion 221_1 of the first arm member 221) disposed (or fastened, connected, or placed) in the third link member 223. The third link member 223 may include a third link body 223_1, and a third upper link sidewall 223_2 (or the first sidewall of the third link member 223) and a third lower link sidewall 223_3 (or the second sidewall of the third link member 223) extending along the z-axis direction on opposite sides (e.g., the outer periphery of the x-axis and -x-axis) of the third link body 223_1. A track (or a track groove into which a protruding track is inserted) protruding toward the third lower link sidewall 223_3 may be formed in the third upper link sidewall 223_2, and a track (or a track groove into which a protruding track is inserted) protruding toward the third upper link sidewall 223_2 may be formed in the third lower link sidewall 223_3. The rails can be fastened to one side (e.g., a rail groove or protruding rail formed towards the -y axis direction) and the opposite side (e.g., a rail groove or protruding rail formed towards the y axis direction) of the first arm 221_1, respectively. This is used to fix the third link member 223 to the first housing 110. Figure 2 A structure (e.g., at least one hole or recess) can be formed in the third upper link sidewall 223_2 and the third lower link sidewall 223_3. An empty space can be formed between the third upper link sidewall 223_2 and the third lower link sidewall 223_3, and the first arm portion 221_1 of the first arm member 221 can be disposed in the empty space, and the first arm portion 221_1 can slide along a track formed in the third link member 223. Meanwhile, although the third link member 223 and the first link member 215 are shown as separate in the drawings, this disclosure is not limited thereto. For example, the third link member 223 can be integrally formed with the first link member 215.

[0070] Additionally, the third link member 223 may also include a third link elastic body 225 (or an elastic member of the third link member 223), which is disposed on the bottom surface of the third link body 223_1 and supports the first arm member 221 connected to the track in the z-axis direction. One side of the third link elastic body 225 may be held on the third link body 223_1, and the third link elastic body 225 may apply a spring force in the z-axis direction or in a specific angular direction between the -x-axis and z-axis when supporting the rear surface (e.g., the surface observed in the -z-axis direction) of the first arm member 221 connected to the third link member 223. Based on this, because the first arm member 221 and the third link member 223 are in closer contact with each other during the hinge operation of the first arm member 221, movement caused by irregular gaps between the first arm member 221 and the third link member 223 can be suppressed, thereby allowing the first arm member 221 to perform a more robust sliding operation with improved movement.

[0071] According to an embodiment, the fourth link member 224 may include a structure in which a portion of the second arm member 222 (e.g., the second arm portion 222_1 of the second arm member 222) is disposed (or fastened, connected, or placed) therein. The fourth link member 224 may include a fourth link body 224_1, and a fourth upper link sidewall 224_2 (or a first sidewall of the fourth link member 224) and a fourth lower link sidewall 224_3 (or a second sidewall of the fourth link member 224) extending along the z-axis direction on opposite sides (e.g., the outer periphery of the x-axis and -x-axis) of the fourth link body 224_1. The fourth link member 224 may have the same or similar dimensions and shape as the third link member 223. The fourth link member 224 may be configured to be symmetrical with respect to the horizontal centerline of the fixed support 213. According to an embodiment, a track (or a track groove into which a protruding track is inserted) protruding toward the fourth lower link sidewall 224_3 can be formed in the fourth upper link sidewall 224_2, and a track (or a track groove into which a protruding track is inserted) protruding toward the fourth upper link sidewall 224_2 can be formed in the fourth lower link sidewall 224_3. The track formed in the fourth link member 224 can be respectively fastened to one side (e.g., a track groove or protruding track formed toward the -y axis direction) and the opposite side (e.g., a track groove or protruding track formed toward the y axis direction) of the second arm portion 222_1 of the second arm member 222. This is used to fix the fourth link member 224 to the second housing 120. Figure 2A structure (e.g., at least one hole or recess) can be formed in the fourth upper link sidewall 224_2 and the fourth lower link sidewall 224_3. The second arm 222_1 can be disposed in the empty space between the fourth upper link sidewall 224_2 and the fourth lower link sidewall 224_3, and the second arm 222_1 can slide along a track formed in the fourth link member 224.

[0072] Additionally, the fourth link member 224 may also include a fourth link elastic body 226 (or an elastic body of the fourth link member 224), which is disposed on the bottom surface of the fourth link body 224_1 and supports the second arm member 222 connected to the track in the z-axis direction. The fourth link elastic body 226 may have the same or similar size and shape as the third link elastic body 225 described above within a certain error range, and may be configured symmetrically with respect to the horizontal centerline of the fixed bracket 213. When the second arm member 222 slides on the fourth link member 224, the fourth link elastic body 226 can prevent the second arm member 222 from moving by applying an elastic force.

[0073] At least one of the first link member 215, the second link member 216, the third link member 223, and the fourth link member 224 may be formed of the same material. Alternatively, it may be formed at least partially of another structure (e.g., an injection-molded product). While it has been shown in the above description that link members 215, 216, 223, and 224 are separate, this disclosure is not limited thereto. For example, the first link member 215 and the third link member 223 may be connected to each other or integrally formed, and the second link member 216 and the fourth link member 224 may be connected to each other or integrally formed.

[0074] According to an embodiment, the first arm member 221 may be symmetrically arranged with respect to the second arm member 222 relative to the y-axis or -y-axis. The first arm member 221 may rotate relative to the center of the first axis 231 in the z-axis direction (or counterclockwise relative to the direction from the extension 213a5 of the fixed bracket towards the upper end 213a3 of the fixed bracket) from the x-axis when the portable electronic device 100 changes from the folded state to the unfolded state, and may also rotate in the x-axis direction (or clockwise) from the z-axis when the portable electronic device 100 changes from the folded state to the unfolded state. The first arm member 221 may include a first arm portion 221_1 and a first main gear 221_2. The first arm portion 221_1 may include track structures protruding in the -y-axis and y-axis directions respectively to connect to the third link member 223 for sliding. The first arm portion 221_1 of the first arm member 221 may rotate within a specific angular range in the third link member 223 relative to the seventh axis axis_B1. The first main gear 221_2 is the portion connected to the first shaft 231 and includes a through hole through the first shaft 231. A gear pattern can be formed on at least a portion of the outer surface of the first main gear 221_2. The first main gear 221_2 can be gear-coupled to an adjacent first gear 238a. At least a portion of the through hole in the first main gear 221_2 into which the first shaft 231 is inserted can have a "D" shaped cut. The first main gear 221_2 can rotate within a specific angular range about the centerline of the first shaft 231 (relative to the third axis axis_B3). The first arm 221_1 can include a hook or step configured to be stopped by one side of the gear support 236 when rotating by a specific angle or more, to prevent the portable electronic device 100 from rotating by a predetermined angle or more.

[0075] According to an embodiment, the second arm member 222 may be configured to be symmetrical with respect to the y-axis or -y-axis to the first arm member 221. When the portable electronic device 100 changes from an unfolded state to a folded state based on the y-axis (or relative to the direction from the extension portion 213a5 of the fixed bracket towards the upper end 213a3 of the fixed bracket), the second arm member 222 may rotate clockwise, and when the portable electronic device 100 changes from a folded state to an unfolded state, the second arm member 222 may rotate counterclockwise. The second arm member 222 may rotate in a direction opposite to the direction of movement of the first arm member 221. The second arm member 222 may include a second arm portion 222_1 and a second main gear 222_2. The second arm portion 222_1 may include a track groove (or track) formed to extend toward the fourth link member 224 and is arranged along the -y-axis and y-axis directions to be fastened to the track (or track groove) formed in the fourth link member 224. The second arm 222_1 can be fastened to the fourth link member 224 and can rotate within a specific angular range relative to the eighth axis axis_B2. Rotation may include sliding movement performed along a track. The second main gear 222_2 is the portion coupled to the second shaft 232, similar to the first main gear 221_2, and may include a through-hole through the second shaft 232, and a gear pattern may be formed on at least a portion of the outer surface of the second main gear 222_2. The second main gear 222_2 may be gear-coupled to an adjacent second gear 239a. At least a portion of the through-hole of the second main gear 222_2 into which the second shaft 232 is inserted may have a "D"-shaped cut. The second main gear 222_2 can rotate within a specific angular range relative to the centerline of the second shaft 232 (relative to the fourth axis axis_B4). The second arm 222_1 may include a hook or step configured to stop at one side of the gear holder 236 when rotating by a specific angle or more, to prevent the portable electronic device 100 from rotating by a predetermined angle or more.

[0076] According to various embodiments, the track structures (or arcuate track structures) formed in the first rotating member 211, the second rotating member 212, the first arm member 221 and the second arm member 222, the third link member 223 and the fourth link member 224, and the fixed bracket 213 can be formed as either track grooves or track protrusions, and other connecting structures can have the shape of track protrusions or track grooves. As an example, the track structures 211_2a and 211_1a of the first rotating member 211 have track shapes, but can be changed to the shape of track grooves, and correspondingly, the shape of the fixed bracket 213 can be changed. Similarly, the track structures of the second rotating member 212 and the fixed bracket 213, the first arm member 221 and the third link member 223, and the second arm member 222 and the fourth link member 224 can be designed such that when one side has a recessed or protruding structure, the other side has a protruding or recessed structure, so that they can interlock with each other.

[0077] According to an embodiment, the first gear shaft 238 (or the first countershaft or the first auxiliary shaft) may have a rod shape, which is arranged parallel to the first shaft 231 and extends elongated in the z-axis direction. The first gear 238a may be disposed on one side of the first gear shaft 238. When the first gear 238a rotates, the first gear shaft 238 may rotate about the ninth axis axis_B5. The first gear 238a may be disposed between the first primary gear 221_2 and the second gear 239a formed in the second gear shaft 239, and the first primary gear 221_2 and the second gear 239a may be geared together. The diameter of the first gear shaft 238 may vary depending on its position. For example, the diameter of the outer periphery of the first gear shaft 238 along the -y axis may be larger than the diameter of its outer periphery along the y axis. The opposite sides of the first gear shaft 238 (e.g., at least a portion in the y-axis direction from the center of the shaft) can be connected to (or configured to pass through holes formed in the configuration) the central side of the first support member 248a, the central side of the second support member 248b, the central side of the cam member 241, the first upper auxiliary cam 244c (or the third cam), the third cam elastic member 242c, the first auxiliary friction member 249c3, and the central side of the third support member 248c.

[0078] According to an embodiment, the second gear shaft 239 (or the second countershaft or the second auxiliary shaft) may have a rod shape, which is arranged parallel to the first gear shaft 238 and extends elongated in the z-axis direction. The second gear 239a may be arranged on one side of the second gear shaft 239. The second gear 239a may be arranged between the second primary gear 222_2 and the first gear 238a formed on the first gear shaft 238, and may be gear-coupled to the second primary gear 222_2 and the first gear 238a. When the second gear 239a rotates, the second gear shaft 239 may rotate relative to the tenth axis axis_B6 formed in its central portion. Similar to the first gear shaft 238, the diameter of the second gear shaft 239 may vary depending on its position. The opposite sides of the second gear shaft 239 (e.g., at least a portion in the y-axis direction from the center of the shaft) can be connected to (or configured to pass through a hole formed in the configuration) the opposite sides of the centers of the first support member 248a, the opposite sides of the centers of the second support member 248b, the opposite sides of the centers of the cam member 241, the second upper auxiliary cam 244d (or the fourth cam), the fourth cam elastic member 242d, the second auxiliary friction member 249c4, and the opposite sides of the centers of the third support member 248c.

[0079] According to an embodiment, the cam member 241 may include a first fixed cam portion 241a, a second fixed cam portion 241b, a third fixed cam portion 241c, and a fourth fixed cam portion 241d.

[0080] A first fixed cam portion 241a may be disposed at the outer periphery of the cam member 241 along the x-axis. The first fixed cam portion 241a has a cylindrical shape surrounding a shaft hole (or a first hole, or a hole in the first fixed cam portion 241a) formed in the central portion to extend through in the y-axis or -y-axis direction. The first fixed cam portion 241a may include a cam pattern portion formed in the y-axis direction and including at least one ridge and at least one valley. The first fixed cam portion 241a may include a pattern in which ridges and valleys are repeatedly arranged to engage with a cam pattern (e.g., at least one ridge and at least one valley) formed on the first cam 244a. A first shaft 231 may be arranged to pass through the shaft hole formed in the central portion of the first fixed cam portion 241a.

[0081] The second fixed cam portion 241b may be disposed at the outer periphery of the -x axis from the center of the cam member 241 (or at a position opposite or symmetrical to the position of the cam member 241 and the position in which the first fixed cam portion 241a is formed). The second fixed cam portion 241b may have a cylindrical shape surrounding a shaft hole (or a second hole, or a hole in the second fixed cam portion 241b), which is formed at its central portion to extend through in the y-axis or -y-axis direction. As an example, the second fixed cam portion 241b may be the same size and shape as the first fixed cam portion 241a within a certain tolerance range and may be arranged parallel to each other. According to an embodiment, the second fixed cam portion 241b may include a repeating pattern of ridges and valleys, which are arranged to engage with a cam pattern (e.g., at least one ridge and at least one valley) formed in the second cam 244b. The shaft hole formed at the central portion of the second fixed cam portion 241b may have a specific shape (e.g., a circular cross-section in the z-axis direction) such that the second shaft 232 can pass through it.

[0082] A third fixed cam portion 241c may be disposed between the first fixed cam portion 241a and the second fixed cam portion 241b. The third fixed cam portion 241c may have a cylindrical shape surrounding a shaft hole (or a third hole, or a hole in the third fixed cam portion 241c), the shaft hole being formed to extend through its central portion in the y-axis or -y-axis direction. As an example, the third fixed cam portion 241c may include a shaft hole smaller in size than the first fixed cam portion 241a. According to an embodiment, the third fixed cam portion 241c may include a repeating pattern of ridges and valleys, configured to engage with a cam pattern (e.g., at least one ridge and at least one valley) formed in the third cam 244c. The size of the cam pattern formed in the third fixed cam portion 241c may be smaller than the size of the cam pattern disposed in the first fixed cam portion 241a. The shaft hole formed at the central portion of the third fixed cam portion 241c may have a specific shape (e.g., a circular cross-section in the z-axis direction) such that the first gear shaft 238 can pass through it. The diameter (or area) of the z-axis cross-section of the first gear shaft 238 can be smaller than the diameter (or area) of the z-axis cross-section of the first shaft 231. Correspondingly, the diameter of the shaft hole of the central portion of the third fixed cam portion 241c can be smaller than the diameter of the shaft hole of the first fixed cam portion 241a into which the first shaft 231 is inserted.

[0083] A fourth fixed cam portion 241d may be disposed between the third fixed cam portion 241c and the second fixed cam portion 241b. The fourth fixed cam portion 241d may have a cylindrical shape surrounding a shaft hole (or a fourth hole, or a hole in the fourth fixed cam portion 241d), which is formed at a central portion to extend through in the y-axis or -y-axis direction. As an example, the fourth fixed cam portion 241d may have the same size and shape as the third fixed cam portion 241c within a certain tolerance range. For example, a cam hole extending through the central portion of the fourth fixed cam portion 241d in the y-axis direction may have the same or similar size as the shaft hole in the third fixed cam portion 241c. According to an embodiment, the fourth fixed cam portion 241d may include a repeating pattern of ridges and valleys, configured to engage with a cam pattern (e.g., at least one ridge and at least one valley) formed in the fourth cam 244d. The size of the cam pattern formed in the fourth fixed cam portion 241d may be the same or similar to the size of the cam pattern disposed in the third fixed cam portion 241c. The shaft hole formed at the center of the fourth fixed cam portion 241d can have a specific shape (e.g., a circular cross-section in the z-axis direction) so that the second gear shaft 239 can pass through it. The diameter (or area) of the z-axis cross-section of the second gear shaft 239 can be formed to be similar to or the same as the diameter (or area) of the z-axis cross-section of the first gear shaft 238. Accordingly, the diameter of the shaft hole at the center of the fourth fixed cam portion 241d can be formed to be the same as or similar to the diameter of the shaft hole in the third fixed cam portion 241c in which the first gear shaft 238 is inserted.

[0084] According to an embodiment, a plurality of cams 244a, 244b, 244c, and 244d may be disposed between the first cam member 241 and the cam elastic members 242a, 242b, 242c, and 242d. For example, the first cam 244a may be disposed between the first fixed cam portion 241a of the first cam member 241 and the first cam elastic member 242a; the second cam 244b may be disposed between the second fixed cam portion 241b of the second cam member 241 and the second cam elastic member 242b; the third cam 244c may be disposed between the third fixed cam portion 241c of the third cam member 241 and the third cam elastic member 242c; and the fourth cam 244d may be disposed between the fourth fixed cam portion 241d of the fourth cam member 241 and the fourth cam elastic member 242d. The plurality of cams 244a, 244b, 244c, and 244d may have shapes corresponding to the cam shape of the facing cam member 241. For example, the first cam 244a and the second cam 244b may have sizes and shapes corresponding to the cam patterns of the first fixed cam portion 241a and the second fixed cam portion 241b. The third cam 244c and the fourth cam 244d may have sizes and shapes corresponding to the cam patterns of the third fixed cam portion 241c and the fourth fixed cam portion 241d. Accordingly, the sizes of the first cam 244a and the second cam 244b may be larger than the sizes of the third cam 244c and the fourth cam 244d. The first cam 244a may be mounted on the first shaft 231, the second cam 244b may be mounted on the second shaft 232, the third cam 244c may be mounted on the first gear shaft 238, and the fourth cam 244d may be mounted on the second gear shaft 239. Furthermore, in the above description, it is stated that the first cam 244a and the second cam 244b are formed to be larger than the third cam 244c and the fourth cam 244d, but this disclosure is not limited thereto. For example, the first cam 244a and the second cam 244b may have the same dimensions as the third cam 244c and the fourth cam 244d. Alternatively, the first cam 244a and the second cam 244b may be formed to be smaller than the third cam 244c and the fourth cam 244d. Alternatively, in a zigzag pattern, although the first cam 244a and the third cam 244c may have the same dimensions, and the second cam 244b and the fourth cam 244d may have the same dimensions, the second cam 244b and the fourth cam 244d may have dimensions different from those of the first cam 244a and the third cam 244c. When the dimensions and shapes of the cams 244a, 244b, 244c, and 244d change, the dimensions and shapes of the fixed cam portions 241a, 241b, 241c, and 241d of the cam member 241 may also change accordingly.

[0085] According to embodiments, foldable electronics with displays of a specific size or larger may require a specific amount or greater torque to maintain a flex mode (a mode in which the folded state remains within an angle range greater than 0 degrees and less than 180 degrees) during the folding or unfolding process. In embodiments of this disclosure, regarding the folding operation of the foldable electronics 100, cam-resilient members 242a, 242b, 242c, and 242d can be provided to perform stable folding or unfolding operations while providing different amounts of elastic force, achieving stable folding or unfolding operations while providing relatively large forces. As an example, some elastic elements of the cam-resilient members 242a, 242b, 242c, and 242d can be implemented using disc springs, and some other elastic elements can be implemented using coil springs. Disc springs can be used in multiple layers depending on the conditions and have a smaller operating displacement than coil springs under the same length conditions, but can achieve greater forces. According to an embodiment, multiple stacked disc springs are arranged on a first shaft 231 and a second shaft 232, and multiple friction members and support members are arranged on the same line, so that high torque can be provided by converting the elastic force of the cam elastic members (e.g., the first cam elastic member 242a and the second cam elastic member 242b) into surface pressure, thereby supporting the maintenance of the flexural mode of foldable electronic devices with screens of a certain size or larger.

[0086] According to an embodiment, in a first cam elastic member 242a (or a first elastic member or a first elastic body), a plurality of stacked springs having a hole at their central portion and bending in the y-axis or -y-axis direction can overlap or stack each other. According to an embodiment, the interior of the disc spring can be hollow, having a hole formed in its central portion, and can include a dome shape protruding to one side. According to an embodiment, the disc spring can have a dome shape that, when viewed along the z-axis direction, has a circular band shape, and when viewed along the x-axis direction perpendicular to the z-axis, the dimensions in the x-axis cross-section of the dome shape decrease as it travels from its outer periphery to its central portion (or includes a shape with a specific inclination (greater than 0 degrees and less than 90 degrees) from its outer periphery to its central portion). A plurality of disc springs can have the same shape. Based on the protruding shape of the disc spring, the disc spring can include a lower end (a portion with a relatively wider outer diameter compared to its upper end or outer periphery) and an upper end (a portion with a relatively narrower inner diameter compared to its lower end or the central portion having a hole (in which a shaft is formed)). The multiple stacked disc springs of the first cam elastic member 242a can be configured such that their lower ends face each other and their upper ends face each other as they overlap.

[0087] According to an embodiment, the first cam elastic member 242a may include a structure in which components (sets) in a state where a first disc spring is inserted into another second disc spring (e.g., the outer side of the upper end of the second disc spring is positioned facing the inner side of the upper end of the first disc spring, or the disc springs overlap each other) are alternately stacked. For example, the first cam elastic member 242a may include the following states or stacking states: in which the outer side of the lower end of a first component in a state where multiple disc springs overlap each other faces the outer side of the lower end of a second type of component in a state where multiple disc springs overlap each other, and in which the outer side of the upper end of the first component faces the outer side of the upper end of the second component. The first cam elastic member 242a may include multiple first and second components arranged in an alternating manner. As an example, the figures show a state in which eight components of multiple disc springs are arranged to overlap each other. However, the first cam elastic member 242a of this disclosure is not limited to this, and the number of components can be adjusted. Furthermore, the first cam elastic member 242a may include a structure in which disc springs are stacked without overlapping each other (e.g., the outer sides of the upper ends of one disc spring and the outer sides of the upper ends of another disc spring are arranged to face each other, and the outer sides of the lower ends of one disc spring and the outer sides of the lower ends of another disc spring are arranged to face each other).

[0088] At least a portion of the main body of the first shaft 231, passing through the first fixed cam portion 241a and the first cam 244a, may be disposed at the center portion of the first cam elastic member 242a. The first cam elastic member 242a is disposed between the cam member 241 and the shaft fixing portion 243, which is fixed to one side of the foldable electronic device 100 (e.g., Figure 2 The hinge housing 150 allows for the application of a spring force to push the first cam 244a toward the first fixed cam portion 241a of the cam member 241. Multiple friction members (e.g., the first friction member 249a1, the third friction member 249b1, and the fifth friction member 249c1) and portions of support members (e.g., one side of the first support member 248a, one side of the second support member 248b, and one side of the third support member 248c) can be disposed on a first shaft 231, on which a first cam elastic member 242a is disposed. Compared to the third cam elastic member 242c, the first cam elastic member 242a can provide a spring force to the aforementioned friction members and support members to facilitate the formation of a relatively high torque.

[0089] According to an embodiment, the second cam elastic member 242b may be configured to be spaced apart from the first cam elastic member 242a by a specific interval and configured to contact a surface of the second cam 244b. The second cam elastic member 242b (or the second elastic member, or the second elastic body) may have a hole at its central portion, and similar to the first cam elastic member 242a, a plurality of disc springs bending in the y-axis or -y-axis direction may overlap each other. According to an embodiment, the number of disc springs in the second cam elastic member 242b may be the same as the number of disc springs in the first cam elastic member 242a. The shape and size of the disc springs overlapping (or stacked on) the second cam elastic member 242b may be the same as or similar to the shape and size of the disc springs overlapping (or stacked on) the first cam elastic member 242a within a specific error range. The magnitude of the elastic force of the second cam elastic member 242b may be the same as or similar to the magnitude of the elastic force of the first cam elastic member 242a within a specific error range. According to an embodiment, the elastic force of the second cam elastic member 242b (or the first cam elastic member 242a) can be set to the size of the third cam elastic member 242c (or the fourth cam elastic member 242d) or larger. At least a portion of the body of the second shaft 232 passing through the second fixed cam portion 241b and the second cam 244b can be disposed at the center portion of the second cam elastic member 242b. The second cam elastic member 242b is disposed between the cam member 241 and the shaft fixing portion 243, and the shaft fixing portion 243 is fixed to one side of the foldable electronic device 100 (e.g., Figure 2 The hinge housing 150 allows for the application of a spring force to push the second cam 244b against the second fixed cam portion 241b of the cam member 241. According to an embodiment, the second cam elastic member 242b can provide spring force to a plurality of friction members inserted into the second shaft 232 (e.g., the second friction member 249a2, the fourth friction member 249b2, and the sixth friction member 249c2) and another portion of the support members (e.g., opposite sides of the first support member 248a, the second support member 248b, and the third support member 248c). Accordingly, the second cam elastic member 242b can contribute to forming a surface pressure or torque having the same or similar size as the first cam elastic member 242a.

[0090] According to an embodiment, the third cam elastic member 242c (or the third elastic member or the third elastic body) may include a helical spring (spring) shape, at least a portion of the first gear shaft 238 is configured to pass through the third cam elastic member 242c at its central portion, and its length in the y-axis and -y-axis directions is longer than its length in other axial directions. The third cam elastic member 242c may be disposed between the first cam elastic member 242a and the second cam elastic member 242b in the x-axis or -x-axis direction, and the third cam elastic member 242c may be configured to apply a spring force to the third cam 244c facing (or contacting) the third fixed cam portion 241c of the cam member 241. The cross-sectional dimension (or outer surface dimension) of the third cam elastic member 242c in the z-axis direction may be smaller than the cross-sectional dimension (or maximum dimension) of the first cam elastic member 242a in the z-axis direction. The compression distance (or compression displacement) of the third cam elastic member 242c in the y-axis or -y-axis direction may be formed to be longer (greater) than the compression distance (or compression displacement) of the first cam elastic member 242a. The magnitude of the elastic force of the third cam elastic member 242c in the y-axis direction or the -y-axis direction can be set to the magnitude of the elastic force of the first cam elastic member 242a or smaller.

[0091] According to an embodiment, the fourth cam elastic member 242d (or the fourth elastic member or the fourth elastic body) may include a helical spring (spring) shape, at least a portion of the second gear shaft 239 is configured to pass through the fourth cam elastic member 242d at its central portion, and wherein the length in the y-axis and -y-axis directions is longer than the length in other axial directions. As an example, the fourth cam elastic member 242d may be formed to have at least one of the same dimensions and shapes as the third cam elastic member 242c. The fourth cam elastic member 242d may be disposed between the third cam elastic member 242c and the second cam elastic member 242b in the x-axis or -x-axis direction, and the fourth cam elastic member 242d may be configured to apply a spring force to the fourth cam 244d facing (or contacting) the fourth fixed cam portion 241d of the cam member 241. The dimensions of the cross-section (or the dimensions of the outer surface) of the fourth cam elastic member 242d in the z-axis direction may be the same as or similar to the dimensions of the cross-section (or the dimensions of the outer surface) of the third cam elastic member 242c in the z-axis direction. The compression distance of the fourth cam elastic member 242d in the y-axis direction or the -y-axis direction can be set to be the same as or similar to the compression distance of the third cam elastic member 242c. The magnitude of the elastic force of the fourth cam elastic member 242d in the y-axis direction or the -y-axis direction can be set to be the same as or similar to the magnitude of the elastic force of the third cam elastic member 242c within a specific error range.

[0092] The shaft fixing part 243 may include a shaft body 243_3, a first fixing part 243_1 having a first shaft hole, and a second fixing part 243_2 having a second shaft hole. The shaft body 243_3 may include a through hole extending in the upward and downward directions (e.g., in the -z-axis direction from a point on the z-axis) and is used to fix the shaft fixing part 243 to the hinge housing 150. Figure 2 The first shaft hole formed in the first fixing portion 243_1 can be formed to extend through in the y-axis or -y-axis direction, and the first shaft 231 can pass through the first shaft hole and be disposed therein. The shape of the first shaft hole can be cylindrical. The first fixing portion 243_1 can support one side of the first cam elastic member 242a. The second shaft hole formed in the second fixing portion 243_2 can be disposed parallel to the first shaft hole in the y-axis, and the second shaft 232 can pass through the second shaft hole and be disposed therein. The shape of the second shaft hole can be cylindrical. The second fixing portion 243_2 can support one side of the second cam elastic member 242b. A first retaining recess in which one side of the first gear shaft 238 (e.g., the outer periphery of the y-axis) is held, and a second retaining recess in which one side of the second gear shaft 239 (e.g., the outer periphery of the y-axis) is held, can be included in the central portion of the shaft body 243_3 (e.g., between the first fixing portion 243_1 and the second fixing portion 243_2).

[0093] At least some of the multiple friction members 249a1, 249a2, 249b1, 249b2, 249c1, 249c2, 249c3, and 249c4, and the support members 248a, 248b, and 248c, face each other and may generate frictional force when the hinge structure 201 rotates while being pressed by pressure applied by the cam elastic members 242a, 242b, 242c, and 242d. The frictional force generated by the multiple friction members 249a1, 249a2, 249b1, 249b2, 249c1, 249c2, 249c3, and 249c4 can be applied as a torque to maintain a specific holding angle during the folding or unfolding of the foldable electronic device 100. As an example, a first friction member 249a1 may be disposed between one side of the first support member 248a (e.g., the x-axis outer periphery of the first support member 248a) and one side of the second support member 248b (e.g., the x-axis outer periphery of the second support member 248b), and a second friction member 249a2 may be disposed between the opposite side of the first support member 248a (e.g., the -x-axis outer periphery of the first support member 248a) and the opposite side of the second support member 248b (e.g., the -x-axis outer periphery of the second support member 248b). A third friction member 249b1 may be disposed between one side of the second support member 248b and the rear surface of the portion of the cam member 241 in which the first fixed cam portion 241a is formed, and a fourth friction member 249b2 may be disposed between the opposite side of the second support member 248b and the rear surface of the portion of the cam member 241 in which the second fixed cam portion 241b is formed. The fifth friction member 249c1 can be disposed between one side of the first cam elastic member 242a and the third support member 248c (e.g., the outer periphery of the third support member 248c along the x-axis), and the sixth friction member 249c2 can be disposed between the opposite side of the second cam elastic member 242b and the third support member 248c (e.g., the outer periphery of the third support member 248c along the -x-axis). The first auxiliary friction member 249c3 can be disposed relative to the x-axis between the fifth friction member 249c1 and the sixth friction member 249c2, and can be disposed relative to the y-axis between one side of the central portion of the third cam elastic member 242c and the third support member 248c. The second auxiliary friction member 249c4 can be disposed relative to the x-axis between the sixth friction member 249c2 and the first auxiliary friction member 249c3, and can be disposed relative to the y-axis between the opposite side of the central portion of the third cam elastic member 242c and the third support member 248c.

[0094] A first fixing nut 249d1 can be fastened to one side (outer periphery of the y-axis) of a protruding first shaft 231 while passing through the first fixing portion 243_1 of the shaft fixing portion 243. According to an embodiment, at least a portion of one side of the first shaft 231 includes a bolt shape (or bolt pattern), and the first fixing nut 249d1 can be fastened to at least a portion of one side of the first shaft 231 by a bolt and nut connection. A second fixing nut 249d2 can be fastened to one side (outer periphery of the y-axis) of a protruding second shaft 232 while passing through the second fixing portion 243_2 of the shaft fixing portion 243. According to an embodiment, at least a portion of one side of the second shaft 232 includes a bolt shape (or bolt pattern), and is the same as or similar to the first fixing nut 249d1. The second fixing nut 249d2 can be fastened to at least a portion of one side of the second shaft 232 by a bolt and nut connection. The fixing nuts 249d1 and 249d2 (or fixing members or fixing bodies) can prevent the first shaft 231 and the second shaft 232 from moving or deviating. At least some of the plurality of friction members 249a1, 249a2, 249b1, 249b2, 249c1, 249c2, 249c3, and 249c4 can be configured to improve wear on other adjacent structures. Meanwhile, at least some of the aforementioned plurality of friction members 249a1, 249a2, 249b1, 249b2, 249c1, 249c2, 249c3, and 249c4 can be omitted. Alternatively, additional friction members can be added to the hinge structure 201. Furthermore, a key feature of this disclosure is the use of cam elastic members of different shapes, and at least some of their position, arrangement, size, or shape can be modified or changed. Moreover, the hinge structure 201 of this disclosure does not necessarily require all structures related to hinge operation other than the cam elastic members, and at least some structures can be excluded or replaced with other structures to the understanding of those skilled in the art. As an example, as described above, at least some of the link members 215, 216, 223, and 224 can be configured to interact with the first housing ( Figure 2 The first housing 110) and the second housing ( Figure 2The second housing 120 is integrally formed, the fixed bracket extension 213a5 can be removed from the fixed bracket 213, and the fixed bracket 213 may only include the upper fixed bracket 213a. Furthermore, if necessary, the gear bracket 236 can be omitted, and the fixing nuts 249d1 and 249d2 can be replaced with E-rings. Moreover, although the rotating members 211 and 212 are shown to have a structure including two upper rotating bodies and a lower rotating body, the rotating members 211 and 212 may have an integral structure excluding separate rotating elastic bodies. Accordingly, the first link member 215 and the second link member 216 do not include the first link connecting member 215a and the second link connecting member 216a, the first link elastic body 215b and the second link elastic body 216b, the first link connecting ring 215c and the second link connecting ring 216c, and may include a track (or track groove) with a specific curvature. Accordingly, the link connection portion of the first rotating member 211 and the second rotating member 212 can be changed to a track groove (or track).

[0095] Figure 7 This is a view illustrating an example of a cam member and a form of cam in a hinge structure according to an embodiment. Figure 8 This is a view illustrating the torque variation during the unfolding and folding of the hinge structure according to an embodiment.

[0096] refer to Figures 1 to 7 According to an embodiment, the hinge structure 201 includes at least cam members 241, cams 244a, 244b, 244c and 244d, and cam elastic members 242a, 242b, 242c and 242d. Furthermore, the hinge structure 201 may include a second support member 248b, a third friction member 249b1 and a fourth friction member 249b2, and may also include a shaft disposed through these members.

[0097] Some of the cam elastic members 242a, 242b, 242c, and 242d may belong to a different type from the remaining cam elastic members. For example, the first cam elastic member 242a and the second cam elastic member 242b may include a structure in which disc springs are stacked. The third cam elastic member 242c and the fourth cam elastic member 242d may include helical springs. The variation in stopping force of the first cam elastic member 242a and the second cam elastic member 242b including disc springs (e.g., 21.1 kgf, which may vary depending on the design) can be set to be greater than the variation in stopping force of the third cam elastic member 242c and the fourth cam elastic member 242d including helical springs (e.g., 6.5 kgf, which may vary depending on the design). As an example, the total compression (or compressibility) of the disc springs is at a maximum level of 0.05 mm per piece, and when six disc springs are stacked, the total maximum compression is less than 0.3 mm, and can be set at a level of 0.2 to 0.25 mm (accommodating plastic deformation and a margin for torque setting). When the cam travel used to achieve the stop is a certain size or greater than the total compression, the torque decreases rapidly in the stop section, whereby the cam travel (the flexural section of the foldable electronics 100 and the spring operating displacement in the opening and closing sections) can be applied by a maximum of 0.1 or less (e.g., 0.05 to 0.1). When a coil spring with a total compression of 2.0 mm has a travel of 0.25, the force reduction of the coil spring is -12.3% and can be maintained at approximately 10%. The force reduction of a disc spring with a total compression of 0.25 mm or less is approximately -20.6% at a travel of 0.05, meaning that the force can be reduced by 20% or more, and when a cam travel of 0.08 mm is applied, the disc spring may experience a torque reduction of -30% or more. Therefore, in the hinge structure 201 of this disclosure, the cam operation amount (e.g., 0.05 mm) of the cam structure pressing the first cam elastic member 242a and the second cam elastic member 242b (e.g., the first fixed cam portion 241a and the second fixed cam portion 241b, the first cam 244a and the second cam 244b) can be set to be less than the cam operation amount (e.g., 0.25 mm) of the cam structure pressing the third cam elastic member 242c and the fourth cam elastic member 242d (e.g., the third fixed cam portion 241c and the fourth fixed cam portion 241d, the third cam 244c and the fourth cam 244d). With the above structure, in the hinge structure 201 of this disclosure, the first cam elastic member 242a and the second cam elastic member 242b are configured to provide high surface pressure or torque, and the third cam elastic member 242c and the fourth cam elastic member 242d support a more stable stopping feel during the operation of folding or unfolding the foldable electronic device 100.According to an embodiment, the spring displacements of the first cam elastic member 242a and the second cam elastic member 242b, which include disc springs, can be set to be less than the spring displacements of the third cam elastic member 242c and the fourth cam elastic member 242d, which include helical springs. However, the above values ​​are examples and can vary depending on the dimensions of the hinge structure 201; therefore, this disclosure is not limited to the above values.

[0098] The second support member 248b may include, for example, a first support portion 248b_1 into which the first shaft 231 is inserted, a second support portion 248b_2 into which the second shaft 232 is inserted, a first central portion 248b_3 into which the first gear shaft 238 is inserted, and a second central portion 248b_4 into which the second gear shaft 239 is inserted. The first support portion 248b_1, the second support portion 248b_2, the first central portion 248b_3, and the second central portion 248b_4 may have a connecting structure 241_con. The first support portion 248b_1 and the second support portion 248b_2 may include holes corresponding to the dimensions of the z-axis cross-sections of the first shaft 231 and the second shaft 232, respectively. The first central portion 248b_3 and the second central portion 248b_4 may include holes corresponding to the dimensions of the z-axis cross-sections of the first gear shaft 238 and the second gear shaft 239, respectively. When the dimensions of the z-axis cross-sections of the first gear shaft 238 and the second gear shaft 239 are smaller than the dimensions of the z-axis cross-sections of the first shaft 231 and the second shaft 232, the dimensions of the holes formed in the first central portion 248b_3 and the second central portion 248b_4 can be smaller than the dimensions of the holes formed in the first support portion 248b_1 and the second support portion 248b_2.

[0099] The cam member 241 may include: a first fixed cam portion 241a disposed between a first cam 244a and a third friction member 249b1 to define a first contact angle a1; a second fixed cam portion 241b disposed between a second cam 244b and a fourth friction member 249b2 to define a first contact angle a1; a third fixed cam portion 241c disposed between a third cam 244c and a first central portion 248b_3 of a second support member 248b to define a second contact angle a2; and a fourth fixed cam portion 241d disposed between a fourth cam 244d and a second central portion 248b_4 of a second support member 248b to define a second contact angle a2.

[0100] A through-hole into which the first shaft 231 can be inserted can be formed inside the first fixed cam portion 241a. Even when the first shaft 231 rotates, the first fixed cam portion 241a can remain in a fixed state. In this regard, the through-hole can have a circular z-axis cross-section, allowing the first shaft 231 to rotate within it. A cam pattern can be formed on one side of the first fixed cam portion 241a (e.g., the side facing the y-axis direction), and the opposite side of the first fixed cam portion 241a (e.g., the side facing the -y-axis direction or the direction facing the third friction member 249b1) can be formed flat. Alternatively, the opposite side of the first fixed cam portion 241a can have a shape corresponding to the shape of the third friction member 249b1. As an example, when the third friction member 249b1 includes a protruding shape in the y-axis direction, at least a portion of the opposite side of the first fixed cam portion 241a can include a recessed shape in the y-axis direction. The cam pattern formed at the first fixed cam portion 241a may have a shape corresponding to the cam pattern of the first cam 244a (e.g., ridges and valleys having heights and lengths similar to those of the ridges and valleys formed in the first cam 244a, and a first slope magnitude). Alternatively, the cam pattern formed at the first fixed cam portion 241a may have a curvature corresponding to the curvature of the cam pattern of the first cam 244a.

[0101] The second fixed cam portion 241b may have a structure substantially the same as or similar to that of the first fixed cam portion 241a. For example, a through hole into which the second shaft 232 can be inserted may be formed inside the second fixed cam portion 241b. The shape of the z-axis cross-section of the through hole may include a circular shape, such that the second fixed cam portion 241b remains fixed even when the second shaft 232 rotates. A cam pattern may be formed on one side of the second fixed cam portion 241b (e.g., the side in the y-axis direction), and the opposite side of the second fixed cam portion 241b (e.g., the side in the -y-axis direction or the side facing the fourth friction member 249b2) may be formed as flat, or may include a shape corresponding to the shape of the fourth friction member 249b2 (e.g., a shape in which a portion is pressed down or recessed in the -y-axis direction). The cam pattern formed at the second fixed cam portion 241b may have a shape corresponding to the cam pattern of the second cam 244b (e.g., ridges and valleys have a height and length similar to the height and length of the ridges and valleys formed in the second cam 244b, and a first slope magnitude). The slope of the cam pattern formed at the second fixed cam portion 241b can be the same as or similar to the slope of the cam pattern formed at the first fixed cam portion 241a. Alternatively, the curvature of the cam pattern formed at the second fixed cam portion 241b can have a curvature corresponding to the curvature of the cam pattern of the second cam 244b.

[0102] A third fixed cam portion 241c, disposed between the first fixed cam portion 241a and the second fixed cam portion 241b, may include a connecting structure physically connected to the first fixed cam portion 241a and physically connected to the fourth fixed cam portion 241d. In various embodiments, the cam member 241 may include a connecting structure 241_con connecting at least some or all of the first fixed cam portion to the fourth fixed cam portion. A through-hole into which the first gear shaft 238 can be inserted may be formed inside the third fixed cam portion 241c. Because the third fixed cam portion 241c is connected to the first fixed cam portion 241a, the third fixed cam portion 241c can remain in a fixed state even when the foldable electronic device 100 is hinged in a folded or unfolded state. In this respect, the through-hole of the third fixed cam portion 241c may have a circular shape in the z-axis cross-section, allowing the first gear shaft 238 to rotate therein. The dimension of the z-axis cross-section of the third fixed cam portion 241c may be smaller than the dimension of the z-axis cross-section of the first fixed cam portion 241a. However, the z-axis cross-sectional dimension of the third fixed cam portion 241c of this disclosure can be set to be the same as or larger than the z-axis cross-sectional dimension of the first fixed cam portion 241a. A cam pattern can be formed on one side of the third fixed cam portion 241c (e.g., the side facing the y-axis direction), and the opposite side of the third fixed cam portion 241c (e.g., the -y-axis direction or the direction facing the first central portion 248b_3 of the second support member 248b) can be formed as flat. The cam pattern formed at the third fixed cam portion 241c can have a shape corresponding to the cam pattern of the third cam 244c (e.g., ridges and valleys have heights and lengths similar to the heights and lengths of the ridges and valleys formed in the third cam 244c, and a second slope magnitude). Alternatively, the curvature of the cam pattern formed at the third fixed cam portion 241c can have a curvature corresponding to the curvature of the cam pattern of the third cam 244c. The second slope magnitude (e.g., the slope magnitude of a ridge or valley) of the cam pattern formed at the third fixed cam portion 241c can be formed to be greater than the first slope magnitude of the cam pattern formed at the first fixed cam portion 241a. Alternatively, the first slope magnitude can be formed to be gentler than the second slope magnitude. According to an embodiment, the length of the inclined surface of the ridge of the third fixed cam portion 241c can be formed to be greater than the length of the inclined surface of the ridge of the first fixed cam portion 241a. Alternatively, the curvature of the curve of the cam pattern formed at the third fixed cam portion 241c (or the curvature of the curve of the cam pattern formed in the third cam 244c) can be formed to be smaller (or gentler) than the curvature of the curve of the cam pattern formed on the first fixed cam portion 241a (or the first cam 244a).Alternatively, the curvature of the cam pattern formed in the first fixed cam portion 241a (or the curvature of the cam pattern formed on the first cam 244a) may be greater (or sharper) than the curvature of the cam pattern formed on the third fixed cam portion 241c (or the third cam 244c). The inclined surface may be at least a portion (or a point) of the curve. Alternatively, at least a portion of the inclined surface may have curvature.

[0103] The fourth fixed cam portion 241d may be disposed between the third fixed cam portion 241c and the second fixed cam portion 241b, and may have a fixing structure physically connected to both the third fixed cam portion 241c and the second fixed cam portion 241b, and may not rotate. The fourth fixed cam portion 241d may have at least one of the same shape, size, and material as the third fixed cam portion 241c. As an example, the z-axis cross-sectional dimension of the fourth fixed cam portion 241d may be the same as that of the third fixed cam portion 241c, and at least a portion of the second gear shaft 239 may be configured to pass through a circularly formed inner through-hole. The fourth fixed cam portion 241d may have a cam pattern formed in its side facing the y-axis direction and may be configured to engage with the fourth cam 244d in response to rotation of the foldable electronic device 100. The magnitude of the second slope formed in the cam pattern of the fourth fixed cam portion 241d may be the same as or similar to the magnitude of the slope formed in the third fixed cam portion 241c. Alternatively, the curvature of the curve of the cam pattern in the fourth fixed cam portion 241d can be the same as or similar to the curvature of the curve of the cam pattern formed at the third fixed cam portion 241c. Accordingly, the magnitude of the second slope formed in the cam pattern of the fourth fixed cam portion 241d can be set to be greater than the magnitude of the slope formed at the first fixed cam portion 241a (or the second fixed cam portion 241b). The length of the inclined surface of the ridge in the cam pattern of the fourth fixed cam portion 241d can be formed to be the same as the length of the inclined surface of the ridge in the cam pattern of the third fixed cam portion 241c. Accordingly, the length of the inclined surface of the ridge in the cam pattern of the fourth fixed cam portion 241d can be formed to be greater than the length of the inclined surface of the ridge in the cam pattern of the second fixed cam portion 241b. Alternatively, the curvature of the cam pattern curve formed at the fourth fixed cam portion 241a (or the curvature of the cam pattern curve formed on the fourth cam 244d) may be smaller (or gentler) than the curvature of the cam pattern curve formed at the second fixed cam portion 241b (or the second cam 244b). Alternatively, the curvature of the cam pattern curve formed in the second fixed cam portion 241b (or the curvature of the cam pattern curve formed on the second cam 244b) may be larger (or sharper) than the curvature of the cam pattern curve formed at the fourth fixed cam portion 241d (or the fourth cam 244d).

[0104] Cams 244a, 244b, 244c, and 244db may include: a first cam 244a disposed between the first cam elastic member 242a and the first fixed cam portion 241a; a second cam 244b disposed between the second cam elastic member 242b and the second fixed cam portion 241b; a third cam 244c disposed between the third cam elastic member 242c and the third fixed cam portion 241c; and a fourth cam 244d disposed between the fourth cam elastic member 242d and the fourth fixed cam portion 241d.

[0105] A first shaft 231 can be inserted into a first cam 244a. The internal shape of the first cam 244a can have a shape corresponding to the z-axis cross-sectional shape of the first shaft 231 (e.g., at least a portion of which is a "D"-shaped cut shape) to rotate in response to rotation of the first shaft 231. The first cam 244a can include a cam pattern (or cam structure) corresponding to the first fixed cam portion 241a. For example, the first cam 244a includes ridges and valleys with shapes opposite to (or engaging with) those formed in the first fixed cam portion 241a, and the slope magnitude of the first cam 244a can be the same as or similar to the slope magnitude of the first fixed cam portion 241a (e.g., a first slope magnitude). The first cam 244a can perform cam operation with the first fixed cam portion 241a by the elasticity provided by the first cam elastic member 242a.

[0106] The second shaft 232 can be inserted into the second cam 244b. The internal shape of the second cam 244b can have a shape corresponding to the z-axis cross-sectional shape of the second shaft 232 (e.g., at least a portion of it is a "D"-shaped cut shape) to rotate in response to rotation of the second shaft 232. The second cam 244b can include a cam pattern (or cam structure) corresponding to the second fixed cam portion 241b. As an example, the second cam 244b can have a slope magnitude that is the same as the absolute value of the slope magnitude of the ridge of the second fixed cam portion 241b, or a slope magnitude that is the same as the slope magnitude of the first cam 244a (e.g., the first slope magnitude). The second cam 244b can perform cam operation with the second fixed cam portion 241b by the elastic force provided by the second cam elastic member 242b. The first cam 244a and the second cam 244b can be pressed by the first cam elastic member 242a and the second cam elastic member 242b, and are configured to achieve a relatively strong torque compared to the third cam 244c and the fourth cam 244d. When the cam contact angle (e.g., first contact angle α1) of the first cam structure (e.g., first cam 244a and second cam 244b, and first fixed cam portion 241a and second fixed cam portion 241b) is set to 20 degrees or less, even if the amount of movement is less than 0.05 to 0.1 mm (torque reduction of 20% or less), no large deviation may occur. During the closing process of the housing, due to the rise of the flexible display when the foldable electronic device 100 is closed (folded), Figure 2 The repulsive force of the flexible display 160 (the repulsive force that will cause the flexible display to unfold), the cam contact angle (e.g., the first contact angle a1) applied by the first cam structure can be used to reduce torque by increasing the spring compression length so that the user does not have to use high force, and can be used to reduce the surface pressure to within 20% to improve the situation where the user cannot feel the user trying to unfold the foldable electronic device 100 due to the strong surface pressure when the foldable electronic device 100 is opened (unfolded) (stop, feel its opening).

[0107] The first gear shaft 238 can be inserted into the third cam 244c. The internal shape of the third cam 244c can have a shape corresponding to the z-axis cross-sectional shape of the first gear shaft 238 (e.g., at least a portion of which is a "D"-shaped cut) to rotate in response to the rotation of the first gear shaft 238. The third cam 244c can include a cam pattern (or cam structure) corresponding to the third fixed cam portion 241c. For example, the third cam 244c can include ridges and valleys with shapes opposite to (or configured to engage with) the ridges and valleys formed in the third fixed cam portion 241c, and the slope magnitude of the third cam 244c can correspond to the slope magnitude of the third fixed cam portion 241c (e.g., a second slope magnitude). The third cam 244c can perform cam operation with the third fixed cam portion 241c by the elastic force provided by the third cam elastic member 242c.

[0108] The second gear shaft 239 can be inserted into the fourth cam 244d. The internal shape of the fourth cam 244d can have a shape corresponding to the z-axis cross-sectional shape of the second gear shaft 239 (e.g., at least a portion of it is a "D"-shaped cut) to rotate in response to the rotation of the second gear shaft 239. The fourth cam 244d can include a cam pattern (or cam structure) corresponding to the fourth fixed cam portion 241d. As an example, the fourth cam 244d can have a slope magnitude that is the same as the absolute value of the slope magnitude of the ridge of the fourth fixed cam portion 241d, or a slope magnitude that is the same as the slope magnitude of the third cam 244c (e.g., a second slope magnitude). The fourth cam 244d can perform cam operation with the fourth fixed cam portion 241d by the elasticity provided by the fourth cam elastic member 242d. As described above, compared to the contact angle of the first cam structure (e.g., the first contact angle a1), the second cam structure (e.g., the third cam 244c and the fourth cam 244d, and the third fixed cam portion 241c and the fourth fixed cam portion 241d) can have a larger (steeper) contact angle (e.g., the second contact angle a2). According to an embodiment, in the unfolded state of the foldable electronic device 100, the unfolded state can be maintained and supported by setting the contact angle of the second cam structure (e.g., the second contact angle a2) to 35 degrees or greater. As an example, sufficient cam travel can be provided due to the basic compression (or compressibility) of the helical spring of 2.0 mm or greater, and therefore, the hinge structure 201 of this disclosure can achieve stopping without much difficulty, despite the rotational deviation of the axis set on the opposite side relative to the horizontal centerline of the fixed bracket 213. The above description of the formation of the first contact angle a1 and the second contact angle a2 and the resulting operating state of the hinge structure 201 can be applied in the same manner or similarly to other hinge structures or the above-described hinge structures described below.

[0109] refer to Figures 1 to 8 As shown in curves 801 and 802, the angles of torque changes (e.g., 801a and 801b) of the first cam structure (e.g., first cam 244a and second cam 244b, and first fixed cam portion 241a and second fixed cam portion 241b) can be gentler than the angles of torque changes (802a and 802b) of the second cam structure (e.g., third cam 244c and fourth cam 244d, and third fixed cam portion 241c and fourth fixed cam portion 241d). Therefore, compared to the cam contact angle (e.g., second contact angle a2) of the second cam structure, the first cam structure with a relatively gentle cam contact angle (e.g., first contact angle a1) can reduce torque deviation due to the formation of the gentle angle. Alternatively, as in curves 801 and 802, the torque variations 802a and 802b caused by the second cam structure (e.g., the third cam 244c and the fourth cam 244d, and the third fixed cam portion 241c and the fourth fixed cam portion 241d) compared to the torque variations (e.g., 801a and 801b) of the first cam structure (e.g., the first cam 244a and the second cam 244b, and the first fixed cam portion 241c and the fourth fixed cam portion 241d) can have relatively sharp cam contact angles (e.g., the second contact angle α2), thereby supporting the implementation of stop during folding and unfolding operations due to the steep angle variation. The torque variations 801a and 801b caused by the first elastic member 242a and the second elastic member 242b and the first cam structure, as well as the torque variations 802a and 802b caused by the third elastic member 242c and the fourth elastic member 242d and the second cam structure, may include a portion of the torque variation when the foldable electronics unfolds from a fully folded state to a specific angle (e.g., less than 180 degrees) or changes from a specific angle state to a fully unfolded state (e.g., 180 degrees).

[0110] Therefore, as shown by curve 803, which illustrates the final torque variations 803a and 803b caused by the elastic member and the first and second cam structures, the hinge structure 201 can provide a stable stop in the folded or unfolded state of the foldable electronics 100 by using torque (which integrates torque variations 801a and 801b caused by the gentle cam contact angle (e.g., the first contact angle a1) of the first cam structure, and torque variations 802a and 802b caused by the sharp cam contact angle (e.g., the second contact angle a2) of the second cam structure), while stably supporting the housing at bending angles greater than 0 degrees and less than 180 degrees by using high torque.

[0111] As described above, the hinge structure 201 according to the embodiment can be configured such that the cam contact angle (e.g., the first contact angle α1) of the first cam structure (e.g., the first cam 244a and the second cam 244b, and the first fixed cam portion 241a and the second fixed cam portion 241b) is formed to be gentle, while providing a high surface pressure structure by using the first cam elastic member 242a and the second cam elastic member 242b, the first cam elastic member 242a and the second cam elastic member 242b being fastened to the first shaft 231 and the second shaft 232 and including a disc spring that can generate a surface pressure greater than that of a coil spring. According to an embodiment, the hinge structure 201 can support a stable stopping function based on a second cam structure (e.g., a third cam 244c and a fourth cam 244d, and a third fixed cam portion 241c and a fourth fixed cam portion 241d) fastened to a first gear shaft 238 and a second gear shaft 239, and has a helical spring having a large basic compression to provide sufficient cam travel compared to a disc spring, and having a steeper cam contact angle (e.g., a second contact angle a2) than the cam contact angle of the first cam structure. According to an embodiment, the curvature of the curves formed in the third cam 244c and the fourth cam 244d, and the third fixed cam portion 241c and the fourth fixed cam portion 241d, can be formed to be greater than the curvature of the curves formed in the first cam 244a and the second cam 244b, and the first fixed cam portion 241a and the second fixed cam portion 241b, such that the contact angle of the second cam structure (e.g., the second contact angle a2) can be formed to be greater than the contact angle of the first cam structure (e.g., the first contact angle a1).

[0112] The hinge structure 201 can provide strong torque through the first elastic member 242a and the second elastic member 242b and the first cam structure, and can provide stable stopping function through the third elastic member 242c and the fourth elastic member 242d and the second cam structure, thereby allowing the application of a cam profile (or shape) suitable for achieving these functions, and the disadvantages of the cam structure can be offset by the integrated operation of the torque of the cam structure.

[0113] As described above, a first type of elastic member in the form of a disc spring (e.g., a first cam elastic member 242a and a second cam elastic member 242b providing a first-sized elastic force) can provide an elastic force (or compressive force) of a different magnitude than that of an elastic member in the form of a second type of helical spring (e.g., a third cam elastic member 242c and a fourth cam elastic member 242d providing a second-sized elastic force). As an example, the first-sized elastic force provided by the first type of elastic member (e.g., the first elastic member 242a and the second elastic member 242b) to the first cam structure (e.g., the first fixed cam portion 241a and the second fixed cam portion, and the first cam 244a and the second cam 244b) can be higher than the second-sized elastic force provided by the second type of elastic member (the third elastic member 242c and the fourth elastic member 242d) to the second cam structure (e.g., the third fixed cam portion 241c and the fourth fixed cam portion 241d, and the third cam 244c and the fourth cam 244d). Because the contact angle states of the first cam structure (e.g., first contact angle a1) and the second cam structure (e.g., second contact angle a2) are formed differently depending on whether the hinge structure 201 is in a folded state, an unfolded state, or a holding state at a specific angle (e.g., a flexural mode state or a stop mode), the contributions of the first type of elastic member and the second type of elastic member to a specific state (or the magnitude of the force, the fixing force that holds the foldable electronic device 100 in a specific holding state, or the stopping force that prevents the foldable electronic device 100 from changing its angle in a specific holding state) can be different. When the foldable electronic device 100 is in a flexural mode state, at least one of the first type of elastic member compressing the first cam structure and the second type of elastic member compressing the second cam structure can have a maximum compression state (a state where it cannot be further compressed or deformed).

[0114] According to an embodiment, when the foldable electronic device 100 is folded at a specific angle, a first elastic member 242a and a second elastic member 242b in the form of disc springs can provide a first-sized elastic force to a first cam structure (e.g., a first cam 244a and a second cam 244b, and a first fixed cam portion 241a and a second fixed cam portion 241b), whereby the hinge structure 201 can provide a force to hold the foldable electronic device 100 in the folded state at the specific angle. Alternatively, when the foldable electronic device 100 is folded at a specific angle, the elastic members in the form of disc springs (e.g., a first cam elastic member 242a and a second cam elastic member 242b) can provide a stopping force to prevent the folding angle of the foldable electronic device 100 from changing. The specific angle is an angle in a flexural mode state and may, for example, include an angle less than 180 degrees and greater than 0 degrees, or an angle less than 170 degrees (or 160 degrees) and greater than 10 degrees (or 20 degrees). Here, specific angles such as 180 degrees, 170 degrees, 160 degrees, 20 degrees, 10 degrees, or 0 degrees are examples and can vary depending on the design of the foldable electronic device.

[0115] As an example, refer to Figure 7 When the foldable electronic device 100 is folded at a specific angle (e.g., when the angle between the first housing 110 and the second housing 120 is less than 180 degrees and greater than 0 degrees, or during a folding operation, or during a flexing mode, for example, when a specific folding angle or a specific opening angle of the foldable electronic device 100 is between 10 degrees and 160 degrees), in the hinge structure 201, the upper ends (flat portions or portions with a specific slope) of the first fixed cam portion 241a (or the second fixed cam portion 241b) and the upper ends of the first cam 244a (or the second fixed cam portion 241b) can contact each other. In the folded state at a specific angle (or the state in which the foldable electronic device 100 is folded or unfolded at a specific angle), the first cam elastic member 242a (or the second cam elastic member 242b) can form a high surface pressure that provides high elasticity compared to the third cam elastic member 242c (or the fourth cam elastic member 242d). Compared to the second cam structure, the high surface pressure caused by the first cam structure can help maintain a specific angle (e.g., the angle between the first housing 110 and the second housing 120 is less than 180 degrees and greater than 0 degrees) so that the specific angle of the foldable electronic device 100 does not change to another angle.

[0116] As an example, such as Figure 7As shown, when the foldable electronic device 100 is in the unfolded state (e.g., the angle between the first housing 110 and the second housing 120 is 180 degrees) (or when it remains in the unfolded state), in the hinge structure 201, the first contact angle a1 (or contact tilt angle) (or the first contact angle a1 of the first cam structure) where the first fixed cam portion 241a and the first cam 244a are in contact with each other and the second fixed cam portion 241b and the second cam 244b are in contact with each other can be smaller than the second contact angle a2 (or the second contact angle a2 of the second cam structure) where the third fixed cam portion 241c and the third cam 244c are in contact with each other and the fourth fixed cam portion 241d and the fourth cam 244d are in contact with each other. Alternatively, the hinge structure 201 can have a state where the second contact angle a2 of the second cam structure is greater than the first contact angle a1 of the first cam structure. In this state, even if the elastic forces of the third cam elastic member 242c and the fourth cam elastic member 242d are lower than those of the first cam elastic member 242a and the second cam elastic member 242b, the second cam structure can still help maintain the unfolded state of the hinge structure 201 more, depending on the slope of the second contact angle a2, compared with the first cam structure.

[0117] According to an embodiment, when the foldable electronic device 100 is in a fully folded state (e.g., the angle between the first housing 110 and the second housing 120 is 0 degrees, or a parallel state with shape 11) (or while maintaining the folded state), the second contact angle α2 of the second cam structure of the hinge structure 201 can have a larger slope than the first contact angle α1 of the first cam structure. Therefore, when the foldable electronic device 100 is in a fully folded state, the third cam elastic member 242c and the fourth cam elastic member 242d, along with the second cam structure, can contribute more to holding the hinge structure 201 in the folded state compared to the first cam elastic member 242a, the second cam elastic member 242b, and the first cam structure. Alternatively, when the foldable electronic device 100 is in a fully folded state, the third cam elastic member 242c and the fourth cam elastic member 242d, along with the second cam structure, can contribute more to counteracting the repulsive force that would cause the display 160 to unfold compared to the first cam elastic member 242a, the second cam elastic member 242b, and the first cam structure.

[0118] As described above, when the foldable electronic device 100 changes from a folded state to an unfolded state (or from an unfolded state to a folded state), the first cam structure pressed by a first type of elastic member (e.g., the first cam elastic member 242a and the second cam elastic member 242b) may have a first cam stroke and a contact angle of a first-sized cam pattern (e.g., a first contact angle a1), and the second cam structure pressed by a second type of elastic member (e.g., the third cam elastic member 242c and the fourth cam elastic member 242d) may have a second cam stroke and a contact angle of a second-sized cam pattern (e.g., a second contact angle a2). The first cam stroke and the first contact angle a1 of the first cam structure, and the second cam stroke and the second contact angle a2 of the second cam structure, may depend on various holding angle states, unfolded states, and folded states of the foldable electronic device 100.

[0119] According to an embodiment, while the foldable electronic device 100 is held in a flexural mode, the first type of elastic member (first elastic member 242a and second elastic member 242b) and the first cam structure can contribute more (contribute a greater force) to maintain the foldable electronic device 100 in a flexural mode, based on a higher elastic force than that of the second type of elastic member (third elastic member 242c and fourth elastic member 242d) and the second cam structure. In the flexural mode, the first contact angle a1 of the first cam structure and the second contact angle a2 of the second cam structure can be the same (e.g., 0 degrees or a horizontal state), and the first cam stroke and the second cam stroke are the same.

[0120] According to an embodiment, when the upper portions of the cams in both the first and second cam structures are flat, in the flexure mode, the first contact angle α1 of the first cam structure and the second contact angle α2 of the second cam structure can be 0 degrees or be horizontal. When the upper portions of the cams in both the first and second cam structures are shaped to have a slope greater than 0 degrees, in the flexure mode, the first contact angle α1 of the first cam structure and the second contact angle α2 of the second cam structure can have states other than 0 degrees or horizontal. Alternatively, when the upper portion of the cam in the first cam structure is flat and the upper portion of the cam in the second cam structure has a slope greater than 0, in the flexure mode, the second cam structure can be in a contact state where the cam and the fixed cam portion have a slope greater than 0 degrees, while the first cam structure is in a contact state where the cam and the fixed cam portion are horizontal. The slope of the upper portion of the cam can be smaller than the slope of the lateral tilt portion adjacent to the upper portion of the cam. Alternatively, the upper portion of the cam can be formed more gently than the tilt portion of the cam.

[0121] According to an embodiment, when the foldable electronic device 100 is held in a fully folded state (closed mode) or a fully unfolded state (open mode), a second cam structure having a contact angle (e.g., a second contact angle a2) larger than that of the first cam structure (e.g., first contact angle a1) can be more helpful in maintaining the fully folded or fully unfolded state compared to the first cam structure. For example, when the display 160 is held in a folded state for a certain period of time or longer, folding characteristics (or forces) may occur when the display 160 is fully unfolded, and the large contact angle (e.g., second contact angle a2) of the second cam structure can be more helpful in counteracting the tendency of the display 160 to fold again than the first cam structure. In the fully folded or fully unfolded state, the first cam stroke of the first cam structure may be shorter than the second cam stroke of the second cam structure, and the first contact angle may be formed to be smaller than the second contact angle. Alternatively, the second cam stroke of the second cam structure may be greater than the first cam stroke of the first cam structure, and the second contact angle a2 may be formed to be greater than the first contact angle a1.

[0122] According to an embodiment, during the process of changing the foldable electronic device 100 from a specific holding angle state (or a specific folding angle state, e.g., an open state with an angle between 160 degrees and 10 degrees) to a fully folded state, the contact angle of the first cam structure (e.g., the first contact angle α1) may deviate from 0 degrees (or the horizontal state) shortly before the foldable electronic device 100 is fully folded, and have a slope magnitude other than 0. This reduces the torque provided by the first type of elastic member and the first cam structure, and thus allows the user to fold the foldable electronic device 100 with less force. Additionally or alternatively, a magnetic member disposed in the foldable electronic device may facilitate the full folding of the foldable electronic device 100.

[0123] According to an embodiment, during the transition of the foldable electronic device 100 from a specific holding angle state to a fully unfolded state, the contact angle of the first cam structure (e.g., the first contact angle a1) may deviate from 0 degrees (or a horizontal state) shortly before the foldable electronic device 100 is fully unfolded, and have a slope magnitude other than 0. This reduces the torque provided by the first type of elastic member and the first cam structure, allowing the user to unfold the foldable electronic device 100 with less force. Subsequently, when the contact angle of the second cam structure (e.g., the second contact angle a2) deviates from 0 degrees (or a horizontal state) and has a non-zero slope magnitude, the second type of elastic member presses against the second cam structure with a contact angle (e.g., the second contact angle a2) having a non-zero slope magnitude, allowing the user to fully unfold the foldable electronic device 100 with less force. Figure 9 This is a view illustrating an example of a cam member and another form of cam in a hinge structure according to an embodiment. Figure 10 It shows the unfolding and folding Figure 9 A view showing the torque change during the process of the hinge structure shown.

[0124] Reference Figures 1 to 9 The hinge structure 202 according to the embodiment may include a fixed bracket 213, a first arm member 221, a second arm member 222, a first shaft 231, a second shaft 232, a first gear shaft 238, a second gear shaft 239, a modified cam member 241_ch1, modified cams 244e, 244f, 244c and 244d, cam elastic members 242a, 242b, 242c and 242d, multiple friction members 249a1, 249a2, 249b1, 249b2, 249c1, 249c2, 249c3 and 249c4, multiple support members 248a, 248b and 248c, a shaft fixing part 243, and fixing nuts 249d1 and 249d2. Additionally, the hinge structure 202 may also include a first rotating member connected to the fixed bracket 213 (e.g., ...). Figure 3 The first rotating member 211) and the second rotating member (e.g., Figure 3 The second rotating member 212), and may also include a first link member to which the first rotating member is connected (e.g., Figure 3 The first link member 215), and the second rotating member are connected to the second link member (e.g., Figure 3 The second link member 216), the first arm member 221, and the third link member (e.g., Figure 3 The third link member 223) and the fourth link member (e.g., the second arm member 222) are connected to the second arm member 222. Figure 3 (The fourth link member 224 in the above-described hinge structure 202). In the assembly of the above-described hinge structure 202, at least some of the remaining components, except for the modified cam member 241_ch1 and the modified cams 244e, 244f, 244c and 244d, can have the same characteristics as described above. Figures 3 to 7 The configuration and functions described herein are essentially the same. Therefore, components other than modifying cam component 241_ch1 and cams 244e, 244f, 244c, and 244d will be replaced with the above content.

[0125] The modified cam component 241_ch1 may include a first modified cam portion 241e, a second modified cam portion 241f, a third fixed cam portion 241c, and a fourth fixed cam portion 241d. Here, the third fixed cam portion 241c and the fourth fixed cam portion 241d may have the same characteristics as described above. Figures 3 to 7 The third fixed cam portion 241c and the fourth fixed cam portion 241d described herein have the same construction.

[0126] A through-hole into which the first shaft 231 can be inserted may be formed inside the first modified cam portion 241e. The first modified cam portion 241e may have a through-hole (which has a circular z-axis cross-section) such that the first modified cam portion 241e remains fixed even when the first shaft 231 rotates. One side of the first modified cam portion 241e (e.g., the side facing the y-axis direction) may be formed to be flat, and the opposite side of the first modified cam portion 241e (e.g., the -y-axis direction or the direction facing the third friction member 249b1) may be formed to be flat or may have a shape corresponding to the shape of the third friction member 249b1.

[0127] The second modified cam portion 241f may have the same dimensions and shape as the first modified cam portion 241e. The second modified cam portion 241f may be configured to be symmetrical with respect to the horizontal centerline of the fixing bracket 213 with respect to the first modified cam portion 241e. As an example, a through hole into which the second shaft 232 may be inserted may be formed inside the second modified cam portion 241f, and at least a portion of the z-axis cross-section may include a "D" shaped cut (or an angled shape). One side of the second modified cam portion 241f (e.g., the side facing the y-axis direction) may be formed as flat in the same manner as the first modified cam portion 241e, and the opposite side of the second modified cam portion 241f (e.g., the -y-axis direction or the direction facing the fourth friction member 249b2) may be formed as flat or may have a shape corresponding to the shape of the fourth friction member 249b2.

[0128] Modifying cams 244e, 244f, 244c, and 244d can include a first modified cam 244e, a second modified cam 244f, a third cam 244c, and a fourth cam 244d. The third cam 244c and the fourth cam 244d can have the same characteristics as the above. Figures 3 to 7 The third cam 244c and the fourth cam 244d described herein have the same or similar structure and dimensions. Therefore, the descriptions of the third cam 244c and the fourth cam 244d can be replaced by the above content.

[0129] The first modification cam 244e may include a through hole into which the first shaft 231 is inserted, and at least a portion of its z-axis cross-section is angled to rotate in response to rotation of the first shaft 231. The first modification cam 244e may contact the first modification cam portion 241e by the elastic force provided by the first cam elastic member 242a. The first modification cam 244e may have a flat side facing the first modification cam portion 241e. Therefore, the first modification cam 244e may contact the first modification cam portion 241e in a flat state. Alternatively, the contact angle between the first modification cam 244e and the first modification cam portion 241e may correspond to 0 degrees.

[0130] The second modification cam 244f may include a through hole into which the second shaft 232 is inserted, and at least a portion of its z-axis cross-section is angled to rotate in response to rotation of the second shaft 232. The second modification cam 244f may have the same or similar dimensions and structure as the first modification cam 244e described above. For example, the second modification cam 244f may be configured to be symmetrical to the first modification cam 244e about the horizontal centerline of the fixed bracket 213. The second modification cam 244f may contact the second modification cam portion 241f by the elastic force provided by the second cam elastic member 242b, and the contact angle may be 0 degrees or a horizontal contact.

[0131] refer to Figure 10 As shown in curve 1001, when the folded state (e.g., the state where the angle between the housings is 0 degrees) changes to the bent state (the state where the angle between the housings is greater than 0 degrees but less than 180 degrees), after the torque increases due to the cam operation, the torque caused by the second cam structure (e.g., the third cam 244c and the third fixed cam portion 241c, and the fourth cam 244d and the fourth fixed cam portion 241d) can remain constant, and the torque can decrease as the bent state changes to the unfolded state (e.g., the angle between the housings is 180 degrees). The torque change caused by the second cam structure can be related to the above... Figure 8 The same as curve 801 in the curve.

[0132] As shown in curve 1002, because the contact angle of the cam remains constant, the torque caused by the first modified cam structure (e.g., the first modified cam 244e and the first modified cam portion 241e, and the second modified cam 244f and the second modified cam portion 241f) can be kept constant as shown.

[0133] Accordingly, as in curve 1003, the integrated torque caused by the torque change of the first modified cam structure and the torque change of the second cam structure can be the following value, wherein the torque change provided by the second cam structure is added to the constant torque provided by the first modified cam structure.

[0134] As described above, when flexural mode needs to be supported in most sections from 0 degrees to 180 degrees, there is no need to provide torque variation through the first modified cam structure. The torque is provided by the first modified cam structure with constant surface pressure provided by the disc spring. This surface pressure does not change due to cam operation and is only responsible for a specific level or higher of surface pressure. Thus, the hinge structure 202 can achieve unfolding or closing (or folding) stop by using the second cam structure.

[0135] Figure 11This is a view illustrating an example of a hinge structure in which the position of the cam member and the cam in the hinge structure are changed according to an embodiment.

[0136] Reference Figures 1 to 11 According to the embodiment, the hinge structure 203 may include a fixed bracket 213, a first modification arm member 221_ch1, a second modification arm member 222_ch1, a plurality of friction members 249_ch1, 249_ch2, ​​249_ch3 and 249_ch4, a plurality of support members 248a and 248b, a shaft fixing portion 243, fixing nuts 249d1 and 249d2, a first cam elastic member 242a, a second cam elastic member 242b, a third modification cam elastic member 242e, a fourth modification cam elastic member 242f, a first cam member 241_ch2, ​​a second cam member 246_ch, a first main gear 233a (or a first modified main gear), a second main gear 233b (or a second modified main gear), a first gear 238a and a second gear 239a. Furthermore, the hinge structure 203 may further include a first shaft (or a shaft) on which the first main gear 233a is formed (or fastened). Figure 3 The first shaft 231), and the second shaft on which the second main gear 233b is formed (or fastened) Figure 3 The second shaft 232), the first gear shaft 238 to which the first gear 238a is formed (or fastened), and the second gear shaft 239 to which the second gear 239a is formed (or fastened). Furthermore, the hinge structure 203 may also include a third link member to which the first modification arm member 221_ch1 is connected. Figure 3 The third link member 223) and the fourth link member connected to the second modification arm member 222_ch1 ( Figure 3 The fourth link member 224 may also include a first rotating member that rotates in response to the rotation of the first modifying arm member 221_ch1 and a first link member to which the first rotating member is connected, and a second rotating member that rotates in response to the rotation of the second modifying arm member 222_ch1 and a second link member to which the second rotating member is connected.

[0137] The first modification arm member 221_ch1 may be disposed between a wing on one side of the first cam member 241_ch2 (e.g., the first fixed cam portion 241a) and a wing on one side of the second cam member 246_ch. The first modification arm member 221_ch1 may include a first arm cam 221_cam disposed in a direction facing the first cam member 241_ch2. A first shaft (e.g., ...) passing through the interior of the first modification arm member 221_ch1 may be disposed therethrough. Figure 3The first axis 231 can rotate in one direction (e.g., clockwise or counterclockwise) in response to rotation of the first axis. In this process, the first modifying arm member 221_ch1 can perform cam operation by providing the elasticity of the first cam elastic member 242a to the first fixed cam portion 241a of the first cam member 241_ch2.

[0138] The second modification arm member 222_ch1 may be disposed between the wings on the opposite side of the first cam member 241_ch2 (e.g., the second fixed cam portion 241b) and the opposite side of the second cam member 246_ch. The second modification arm member 222_ch1 may include a second arm cam 222_cam disposed in a direction facing the second fixed cam portion 241b of the first cam member 241_ch2. A second shaft (e.g., ...) may be disposed inside the second modification arm member 222_ch1. Figure 3 The second axis 232 can rotate in one direction (e.g., counterclockwise or clockwise) in response to rotation of the second axis. In this process, the second modifying arm member 222_ch1 can perform cam operation by providing elasticity to the second cam elastic member 242b that provides elasticity to the second fixed cam portion 241b.

[0139] The first cam component 241_ch2 may include a first shaft (e.g., Figure 3 The first fixed cam portion 241a is inserted into the first shaft 231, and the second shaft (e.g., Figure 3 The second fixed cam portion 241b is inserted into the second shaft 232, and the cam connecting portion 241_co connects the first fixed cam portion 241a and the second fixed cam portion 241b. The cam connecting portion 241_co may include a groove supporting the side of the first gear shaft 238 and the second gear shaft 239.

[0140] The second cam member 246_ch may include the first shaft (e.g., Figure 3 The first wing 236_w1 is inserted into the first shaft 231, and the second shaft (e.g., Figure 3The second shaft 232 is inserted into a second wing 236_w2, and a third fixed cam portion 236_cam1 and a fourth fixed cam portion 236_cam2 are disposed between the first wing portion 236_w1 and the second wing portion 236_w2. The first wing portion 236_w1, the second wing portion 236_w2, the third fixed cam portion 236_cam1 and the fourth fixed cam portion 236_cam2 can be connected to each other. The first wing portion 236_w1 and the second wing portion 236_w2 can be used to support friction members (e.g., 249_ch1 and 249ch_2). At least a portion of the first gear shaft 238 can be disposed inside the third fixed cam portion 236_cam1 to pass through it, and at least a portion of the second gear shaft 239 can be disposed inside the fourth fixed cam portion 236_cam2 to pass through it.

[0141] The third modified cam elastic member 242e and the third cam 244g can be fastened to the first gear shaft 238. The third cam 244g can be pressed against the third fixed cam portion 236_cam1 by the elastic force of the third modified cam elastic member 242e. The central sides of the multiple support members 248a and 248b can be inserted into the first gear shaft 238.

[0142] The fourth modified cam elastic member 242f and the fourth cam 244h can be fastened to the second gear shaft 239. The fourth cam 244h can be pressed against the fourth fixed cam portion 236_cam2 by the elastic force of the fourth modified cam elastic member 242f. The center-opposite sides of the multiple support members 248a and 248b can be inserted into the second gear shaft 239.

[0143] As described above, in hinge structure 203, the disc spring type first cam elastic member 242a and the second cam elastic member 242b can press the fixed type first cam member 241_ch2, ​​and the arm cams 221_cam and 222_cam formed on the modification arm members 221_ch1 and 222_ch2, ​​as well as the first cam member 241_ch2, ​​can perform cam operation. In the hinge structure 203 described above, a plurality of friction members 249_ch1, 249_ch2, ​​249_ch3 and 249_ch4 and a plurality of support members 248a and 248b can be fastened to a first axis passing through the first cam elastic member 242a, the first cam member 241_ch2 and the first arm cam 221_cam (e.g., Figure 3 The first axis 231), and the second axis passing through the second cam elastic member 242b, the second cam member 246_ch, and the second arm cam 222_cam (e.g., Figure 3The second shaft 232 provides strong torque due to high surface pressure. Additionally, a third modified cam elastic member 242e and a fourth modified cam elastic member 242f of the coil spring type can be positioned at other locations on the hinge structure 203, while offset from... Figure 3 The first cam elastic member 242a and the second cam elastic member 242b are adjacent to each other as described in the text.

[0144] Figure 12 This is a view illustrating an example of a hinge structure in which the position of the cam is changed according to an embodiment.

[0145] Reference Figures 1 to 12 The hinge structure 204 according to the embodiment may include: a third modification arm member 221_ch2 and a third link member 223 provided with a first arm cam 221_cam (or a first cam of a first modification arm member); a fourth modification arm member 222_ch2 and a fourth link member 224 provided with a second arm cam 222_cam; a first gear 238_cam and a third modification cam 221_cam2; a second gear 239_cam2 and a fourth modification cam 222_cam2; and a plurality of friction members 2 49a1, 249a2, 249b1, 249b2, 249c1 and 249c2; multiple support members 248_a and 248_b; gear bracket 236; first cam member 241_ch4 and second cam member 241_ch5; shaft fixing part 243; fixing nuts 249d1 and 249d2; cam elastic members 242a, 242b, 242c and 242d; first shaft 231 and second shaft 232; and first modified gear shaft 238_ch and second modified gear shaft 239_ch. Additionally, as described above... Figure 3 As described above, the hinge structure 204 may also include a fixing bracket (e.g., Figure 3 The fixed bracket 213), the first rotating component (e.g., Figure 3 The first rotating member 211) and the second rotating member (e.g., Figure 3 The second rotating member 212), the first connecting rod member (e.g., Figure 3 The first link member 215) and the second link member (e.g., Figure 3 The second link member 216).

[0146] The first arm cam 221_cam can be disposed on one side of the third modifying arm member 221_ch2 (e.g., in the direction facing the y-axis, or in the direction where the first cam elastic member 242a is disposed, or in the direction where the first fixed cam portion 241_31 of the first cam member 241_ch4 is disposed). The first shaft 231 can be disposed at the center portion of the first arm cam 221_cam to pass through it, and the first arm cam 221_cam can include a cam pattern (e.g., ridges and valleys, or repeating patterns thereof) corresponding to the first fixed cam portion 241_31. In various embodiments, as described above... Figure 9 As described above, the first arm cam 221_cam can have a flat structure without individual ridges and valleys, resulting in a contact angle of 0 degrees. The side portion of the first arm cam 221_cam, integrally formed with the third modification arm member 221_ch2 (e.g., the outer surface facing the direction of the first cam elastic member 242a) is flat, and the first fixed cam portion 241_31 can also be correspondingly flat. Alternatively, the first fixed cam portion 241_31 can have a cam structure including ridges and valleys. The first main gear 233a (or the first modification main gear), integrally formed with the third modification arm member 221_ch2, ​​can be gear-coupled to the first gear 238a, as described above. Figures 3 to 6 As described above. A through hole can be formed on the inner side of the third modification arm member 221_ch2, ​​on which the first main gear 233a is formed, passing through in the -y-axis or y-axis direction (or the direction in which the first cam elastic member 242a is disposed), and the first shaft 231 can be disposed at at least a portion of the through hole. At least a portion of the space (or through hole) inside the third modification arm member 221_ch2 can define a shape corresponding to the shape of the z-axis cross-section of the first shaft 231 (e.g., at least a portion of which is angled or includes a "D"-shaped cut shape) to rotate in response to rotation of the first shaft 231 (or to rotate the first shaft 231 when the third modification arm member 221_ch2 rotates). The internal space of the first arm cam 221_cam can also have a space corresponding to the shape of the z-axis cross-section of the first shaft 231 disposed in the internal space (e.g., at least a portion of which is angled) to rotate in response to rotation of the first shaft 231.

[0147] The second arm cam 221_cam can be disposed on one side of the fourth modification arm member 222_ch2 (e.g., facing the y-axis, or in the direction where the second cam elastic member 242b is disposed, or in the direction where the second fixed cam portion 241_32 of the first cam member 241_ch4 is disposed). As an example, the second arm cam 222_cam can be integrally formed with the fourth modification arm member 222_ch2. The second arm cam 222_cam can be formed adjacent to the second main gear 233b (or the second modification main gear). Alternatively, the second main gear 233b can be formed while bending in the x-axis direction of the fourth modification arm member 222_ch2, ​​and the second arm cam 222_cam can be disposed facing the y-axis direction. The internal space of the second arm cam 222_cam and the internal space of the fourth modification arm member 222_ch2 surrounded by the second main gear 233b can be connected to each other. The second shaft 232 can be inserted into the connected internal space. During rotation of the second arm cam 222_cam and the second main gear 233b, at least a portion of the internal space is formed at an angle (to include at least one corner), such that the second shaft 232 rotates, and the internal space including at least one corner can correspond to the z-axis cross-sectional shape of the second shaft 232. For example, the z-axis cross-section of the second shaft 232 may include at least one corner. The aforementioned second arm cam 222_cam and the second main gear 233b may have the same or similar structure and dimensions as the first arm cam 221_cam and the first main gear 233a, the first arm cam 221_cam being integrally formed with the aforementioned third modification arm member 221_ch2. The second arm cam 222_cam and the second main gear 233b may be configured to be symmetrical with respect to the centerline intersecting the middle of the first modification gear shaft 238_ch and the second modification gear shaft 239_ch on opposite sides (e.g., the -x axis and the x axis).

[0148] At least one of the first gear 238a and the third modification cam 221_cam2 may be integrally formed with or fixed to the first modification gear shaft 238_ch. As an example, the first gear 238a and the third modification cam 221_cam2 may be integrally formed with each other to surround the outer peripheral surface of the first modification gear shaft 238_ch. The third modification cam 221_cam2 may be disposed (or formed) in the side of the first gear 238a (e.g., facing the y-axis) and may be disposed facing the third fixed cam portion 241_33 of the second cam member 241_ch5. As another example, the first gear 238a may be integrally formed with the first modification gear shaft 238_ch, and the third modification cam 221_cam2, into which the first modification gear shaft 238_ch is inserted, may be disposed between the first gear 238a and the third fixed cam portion 241_33. At least a portion of the internal space of the third modification cam 221_cam2 may be angled (or may include at least one corner) so that it can rotate in response to rotation of the first modification gear shaft 238_ch, and at least a portion of a portion of the z-axis cross-section of the first modification gear shaft 238_ch located in the internal space of the third modification cam 221_cam2 may be angled (or have the same or similar shape to the internal space of the third modification cam 221_cam2). In various embodiments, the first gear 238a may also be provided separately from the first modification gear shaft 238_ch, and the first modification gear shaft 238_ch may be inserted into the internal space of the first gear 238a (e.g., a space defined as a through-hole passing through the y-axis in the -y-axis direction). The internal space of the first gear 238a may include at least one corner, and this shape may correspond to the z-axis cross-section of the first modification gear shaft 238_ch.

[0149] The second modified gear shaft 239_ch may have at least one of the same or similar dimensions and structures as the first modified gear shaft 238_ch described above. For example, the second modified gear shaft 239_ch may include an integral second gear 239a and an integral fourth modified cam 222_cam2, and the second gear 239a and the fourth modified cam 222_cam2 may rotate in response to the rotation of the first modified gear shaft 238_ch. The fourth modified cam 222_cam2 may be configured to face the fourth fixed cam portion 241_34 of the second cam member 241_ch5.

[0150] The gear support 236 may include a hole through which the first shaft 231 and the second shaft 232, as well as the sides of the first modified gear shaft 238_ch and the second modified gear shaft 239_ch, may be configured to pass through. The gear support 236 may include a stop structure that prevents the third modified arm member 221_ch2 and the fourth modified arm member 222_ch2 from rotating at a specific angle or a greater angle.

[0151] The first cam member 241_ch4 can be disposed between the first cam elastic member 242a and the second cam elastic member 242b and the first arm cam 221_cam and the second arm cam 222_cam, and the first fixed cam portion 241_31 and the second fixed cam portion 241_32 included in the first cam member 241_ch4 can be connected to each other for fixation. In this respect, the first cam member 241_ch4 may also include a first connecting structure cam_co1 (or connecting portion) connecting the first fixed cam portion 241_31 and the second fixed cam portion 241_32. The first connecting structure cam_co1 may have two holes passing through in the y-axis and -y-axis directions, and the third modified cam 221_cam2 and the fourth modified cam 222_cam2 are disposed in the two holes to pass through them. The first connecting structure cam_co1 may be configured such that the third modified cam 221_cam2 and the fourth modified cam 222_cam2 can rotate while fixing the first fixed cam portion 241_31 and the second fixed cam portion 241_32. The first fixed cam portion 241_31 and the second fixed cam portion 241_32 may have the same shape and size (or the same elasticity), and may be pressed by the elasticity from the first cam elastic member 242a and the second cam elastic member 242b, respectively, and may be cam-connected to the first arm cam 221_cam and the second arm cam 222_cam. The first shaft 231 and the second shaft 232 may be inserted into the first fixed cam portion 241_31 and the second fixed cam portion 241_32. The interior of the first fixed cam portion 241_31 and the second fixed cam portion 241_32 may include a space (or through hole) with a size equal to or greater than the z-axis cross-sectional size of the first shaft 231 and the second shaft 232, such that the first shaft 231 and the second shaft 232 can rotate after insertion.

[0152] The second cam member 241_ch5 can be disposed between the third cam elastic member 242c and the fourth cam elastic member 242d and the third modified cam 221_cam2 and the fourth modified cam 222_cam2, and can include a third fixed cam portion 241_33, a fourth fixed cam portion 241_34 and a second connecting structure cam_co2. The third fixed cam portion 241_33 and the fourth fixed cam portion 241_34 can have the same shape and size (or the same elasticity) and can be pressed by the elasticity from the third cam elastic member 242c and the fourth cam elastic member 242d, and can be cam-connected to the third modified cam 221_cam2 and the fourth modified cam 222_cam2. The space (e.g., a through hole) in which the first modified gear shaft 238_ch and the second modified gear shaft 239_ch can rotate after being inserted can be formed inside the third fixed cam portion 241_33 and the fourth fixed cam portion 241_34. The second connecting structure cam_co2 can connect the third fixed cam part 241_33 and the fourth fixed cam part 241_34 to fix the third fixed cam part 241_33 and the fourth fixed cam part 241_34 so that the third fixed cam part 241_33 and the fourth fixed cam part 241_34 do not rotate.

[0153] At least one friction member (at least one of 249a1, 249a2, 249b1, 249b2, 249c1, and 249c2) and at least one support member (at least one of 248a and 248b) may be disposed between the cam elastic members 242a, 242b, 242c, and 242d and the shaft fixing portion 243. At least one friction member (at least one of 249a1, 249a2, 249b1, 249b2, 249c1, and 249c2) and at least one support member (at least one of 248a and 248b) may perform the function of converting the elastic force provided by the cam elastic members 242a, 242b, 242c, and 242d into torque (or frictional force). The positions of at least one friction member (at least one of 249a1, 249a2, 249b1, 249b2, 249c1 and 249c2) and at least one support member (at least one of 248a and 248b) can be changed to various positions that can receive the elastic force of the cam elastic members 242a, 242b, 242c and 242d.

[0154] According to an embodiment, the first arm cam 221_cam is not formed in the arm member (or the first modified arm member, or the first arm member), and can be integrally formed with one side of the first main gear 233a. The second arm cam 222_cam is not formed on the arm member (or the second modified arm member, or the second arm member), and can be integrally formed with one side of the second main gear 233b. As described above... Figures 3 to 9 As shown, the first main gear 233a and the second main gear 233b can be integrally formed with the arm component, and as... Figure 11 As described above, it can be provided separately from the arm component, and can be disposed in or integrally formed with the first shaft 231 and the second shaft 232. Therefore, the first arm cam 221_cam can be integrally formed with the first shaft 231 or integrally formed with the side of the first main gear 233a integrally formed with the first shaft 231. The second arm cam 222_cam can be integrally formed with the second shaft 232, or integrally formed with the side of the second main gear 233b integrally formed with the second shaft 232.

[0155] As described above, the hinge structure 204 may have a shape in which the positions of the modifying cams 241_31, 241_32, 241_33, and 241_34 are integrally formed with the structure in which the gears are formed. Alternatively or in addition to this, in Figure 12The diagram illustrates a structure in which the first cam member 241_ch4 is configured to face the first cam elastic member 242a and the second cam elastic member 242b to directly receive the elastic force from the first cam elastic member 242a and the second cam elastic member 242b, but this disclosure is not limited thereto. For example, in the third modification arm member 221_ch2, ​​the first arm cam 221_cam may be formed in a side portion (e.g., a side portion in the -y-axis direction) opposite to one side of the currently shown third modification arm member 221_ch2, ​​and similarly, in the fourth modification arm member 222_ch2, ​​the second arm cam 222_cam may be formed in a side portion (e.g., a side portion in the -y-axis direction) opposite to one side of the currently shown fourth modification arm member 222_ch2. Accordingly, the first cam member 241_ch4 may be disposed between the third modification arm member 221_ch2 and the fourth modification arm member 222_ch2 and the gear support 236. According to the embodiment, the positions of the second cam member 241_ch5, the third modification cam 221_cam2, and the fourth modification cam 222_cam2 can also move between the first gear 238a, the second gear 239a, and the gear support 236. In the hinge structure described above, the first cam elastic member 242a and the second cam elastic member 242b can directly provide elastic force to the third modification arm member 221_ch2 and the fourth modification arm member 222_ch2, ​​and the third cam elastic member 242c and the fourth cam elastic member 242d can directly provide elastic force to the first gear 238a and the second gear 239a.

[0156] The hinge structure of this disclosure allows the helical spring associated with the implementation of the stop to be independently disposed in the second tilting cam structure, while, regarding the implementation of high torque, a disc spring with a specific reference value of high force can be used in the first tilting cam structure. For example, in the unfolded or folded (open or closed) state of the foldable electronic device, the hinge structure of this disclosure, while operating the disc spring to obtain a strong spring force to provide a strong surface pressure structure, achieves high torque (higher torque, or reference value torque or greater torque) by providing a cam structure with a gentle slope of 20 degrees or less (e.g., fixed cam portion and cam pattern), and can facilitate the folding of the foldable electronic device or increase the feel of the unfolding stop by reducing the basic torque (the torque provided by the disc spring when the foldable electronic device 100 is in the folded or unfolded state). Furthermore, in order to support the implementation of the stopping force in the unfolded and folded states of the hinge structure of the foldable electronic device 100, a cam structure with a contact angle of 35 degrees or greater can be constructed in the rotational section where the stopping of the foldable electronic device 100 is required by using a helical spring (where the basic compression of the elastic body is a specific reference value or greater) (e.g., at least one fixed cam portion and at least one cam with a contact angle of 35 degrees or greater cam pattern).

[0157] Figure 13 This is a view showing an example of a cam pattern according to an embodiment.

[0158] refer to Figures 1 to 13According to an embodiment, the cam pattern may include an upper cam pattern 244_cam and a lower cam pattern 241_cam. When the foldable electronic device 100 is in a folded (or closed) state, the upper cam pattern 244_cam and the lower cam pattern 241_cam may contact each other, having a first slope size 240_sl1, and may define a third contact angle a3. When the foldable electronic device 100 is in an unfolded (or open or open) state, the upper cam pattern 244_cam and the lower cam pattern 241_cam contact each other, having a second slope size 240_sl2 different from the first slope size 240_sl1, and may define a fourth contact angle a4. According to an embodiment, the angle of the first slope size 240_sl1 (e.g., the third contact angle a3) may be greater than the angle of the second slope size 240_sl2 (e.g., the first contact angle a1). Alternatively, the second slope size 240_sl2 may be formed to be gentler than the first slope size 240_sl1. In this regard, at a specific angle when the foldable electronic device 100 unfolds from the folded state, a ridge of the upper cam pattern 244_cam with a defined first slope size 240_sl1 and a corresponding ridge of the lower cam pattern 241_cam can rotate while in contact with each other, having the same inclined surface, and then a first force (or a force of a first magnitude) may be required to rotate at the first slope size 240_sl1. Because in the folded state of the foldable electronic device 100, the upper cam pattern 244_cam and the lower cam pattern 241_cam are in contact with each other while defining a first slope size 240_sl1 (to define a third contact angle a3), when the upper cam pattern 244_cam and the lower cam pattern 241_cam are pressed by an externally applied elastic force to rotate in different directions (e.g., the upper cam pattern 244_cam is pressed to rotate from right to left or counterclockwise, and the lower cam pattern 241_cam is pressed to rotate from left to right or clockwise), the upper cam pattern 244_cam and the lower cam pattern 241_cam can counteract the flexible display included in the foldable electronic device 100. Figure 2 At least a portion of the repulsive force that the flexible display 160 is to be deployed.

[0159] According to an embodiment, at a specific angle when the foldable electronic device 100 is folded from the unfolded state, a ridge of the upper cam pattern 244_cam with a defined second slope size 240_sl2 and a corresponding ridge of the lower cam pattern 241_cam can rotate while in contact with each other, having the same inclined surface. Then, a second force (or a force of a second magnitude) less than the first force may be required for rotation with the second slope size 240_sl2.

[0160] In the unfolded state of the foldable electronic device 100, the upper cam pattern 244_cam and the lower cam pattern 241_cam contact each other to define a second slope size 240_sl2 to define a fourth contact angle a4. The upper cam pattern 244_cam and the lower cam pattern 241_cam can be pressed by an externally applied elastic force to rotate in different directions (e.g., the upper cam pattern 244_cam is pressed to rotate from left to right or clockwise, and the lower cam pattern 241_cam is pressed to rotate from right to left or counterclockwise), and can counteract the flexible display included in the foldable electronic device 100. Figure 2 The flexible display 160) is to be folded by at least a portion of the repulsive force (when the flexible display ( Figure 2 (When the flexible display 160) is in a folded state for a specific time, or when it tends to fold from an unfolded state to a specific angle).

[0161] The aforementioned upper cam pattern 244_cam and lower cam pattern 241_cam can be applied to at least some of the aforementioned fixed cam portions and cams (or modified cams). As an example, the structure in which two inclined surfaces defining a ridge form different slope angles can be applied to the aforementioned third cams 244c and 244g (or third modified cam 221_cam2) and fourth cams 244d and 244h (or fourth modified cam 222_cam2), as well as the third fixed cam portions 241c, 236_cam1 and 241_33 and the fourth fixed cam portions 241d, 236_cam2 and 241_34, but may not be applied to the first cam 244a (or first modified cams 244e and 222_cam) and second cam 244b (or second modified cams 244f and 221_cam), as well as the first fixed cam portions 241a and 241_31 and the second fixed cam portions 241b and 241_32.

[0162] Furthermore, the above description of the embodiments shows a structure where opposite sides (e.g., the x-axis direction and the -x-axis direction) are symmetrical with respect to the horizontal centerline of the fixed bracket 213; however, the embodiments of this disclosure are not limited thereto. For example, different types of elastic members can be alternately arranged (e.g., refer to...). Figure 9 The first cam elastic member 242a, the third cam elastic member 242c, the second cam elastic member 242b, and the fourth cam elastic member 242d are arranged in the order of first cam elastic member 242a, third cam elastic member 242c, second cam elastic member 242b, and fourth cam elastic member 242d relative to the x-axis to -x-axis direction. Alternatively, the first cam and the second cam can be arranged adjacent to each other, and the third cam and the fourth cam can be arranged adjacent to each other (see, for example, see...). Figure 9The first cam elastic member 242a, the second cam elastic member 242b, the third cam elastic member 242c, and the fourth cam elastic member 242d are arranged in the order of first cam elastic member 242a, second cam elastic member 242b, third cam elastic member 242c, and fourth cam elastic member 242d relative to the x-axis to -x-axis direction. Furthermore, relatively high torque elastic members can be provided (e.g., Figure 9 The first cam elastic member 242a and the second cam elastic member 242b can be disposed inside the horizontal centerline of the fixed bracket 213, and can provide elastic members with relatively low torque (e.g., Figure 9 The third cam elastic member 242c and the fourth cam elastic member 242d can be disposed on the outer side (e.g., regarding Figure 9 The first cam elastic member 242a and the second cam elastic member 242b are disposed between the third cam elastic member 242c and the fourth cam elastic member 242d.

[0163] In the various embodiments described above, the foldable electronic device (or portable electronic device) according to the embodiments may include a first housing 110 and a second housing 120, a hinge structure 201 connecting the first housing and the second housing, and a flexible display. The hinge structure may include: a first rotating member 211 and a second rotating member 212, the first rotating member 211 being coupled to the first housing and the second rotating member 212 being coupled to the second housing; a first arm member 221 and a second arm member 222, the first arm member 221 rotating in response to rotation of the first rotating member and the second arm member 222 rotating in response to rotation of the second rotating member; a first shaft 231, a first main gear 221_2 disposed on the first shaft 231 and the first shaft 231 being coupled to the first arm member; a second shaft 232, a second main gear 222_2 disposed on the second shaft 232 and the second shaft 232 being coupled to the second arm member; a third shaft 238 disposed between the first main gear and the second main gear, and a first gear 238a disposed on the third shaft; and a fourth shaft 23... 9. A fourth shaft 239 is disposed between the third shaft and the second main gear, and a second gear 239a is disposed on the fourth shaft 239; first cams to fourth cams 244a, 244b, 244c, and 244d are respectively connected to the first shaft to the fourth shaft; a cam member 241 is connected to the first shaft to the fourth shaft and includes a first fixed cam portion to a fourth fixed cam portion facing the first cam to the fourth cam; a first elastic member 242a is connected to the first shaft to provide a first elastic force to the first cam; a second elastic member 242b is connected to the second shaft to provide a first elastic force to the second cam; a third elastic member 242c is connected to the third shaft to provide a second elastic force to the third cam; and a fourth elastic member 242d is connected to the fourth shaft to provide a second elastic force to the fourth cam. The slope of the first cam may be different from the slope of the third cam, and the type of the first elastic member may be different from the type of the third elastic member.

[0164] According to an embodiment, the first cam and the first fixed cam portion define a first contact angle by the elastic force applied by the first elastic member (or the pressing or pressure applied by the elastic force of the first elastic member), the third cam and the third fixed cam portion define a second contact angle by the elastic force applied by the third elastic member, and when the foldable electronic device is in the unfolded state, the size of the first contact angle is smaller than the size of the second contact angle.

[0165] According to an embodiment, the contribution (or contribution rate) of the second contact angle to maintaining the unfolded state of the foldable electronic device can be greater than the contribution of the first contact angle.

[0166] According to an embodiment, the first cam and the first fixed cam portion form a first contact angle by the elastic force applied by the first elastic member, the third cam and the third fixed cam portion define a second contact angle by the elastic force applied by the third elastic member, and when the angle between the first housing and the second housing is maintained within a defined angle range (or a specific angle range) corresponding to the partially folded state, the size of the first contact angle is formed to be the same as the size of the second contact angle.

[0167] According to an embodiment, when the angle between the first housing and the second housing is maintained within a defined angle range corresponding to the partially folded state, the contribution of the elastic force applied by the first elastic member to maintaining the angle range is greater than the contribution of the elastic force applied by the second elastic member to maintaining the angle range.

[0168] According to an embodiment, during the additional resistance to rotation caused by rotation between the first and second housings (e.g., rotation that occurs when a spring force is applied when the upper portion of the cam (fixed cam portion and cam) of the hinge structure is not flat and is designed to have a specific inclination) provided within an angle range corresponding to the partially folded state of the foldable electronic device, the contribution of the spring force applied by the first elastic member to maintaining the angle range is greater than the contribution of the spring force applied by the second elastic member to maintaining the angle range.

[0169] According to an embodiment, the first cam and the first fixed cam portion define the first cam stroke by an elastic force applied by the first elastic member, and the third cam and the third fixed cam portion define the second cam stroke by an elastic force applied by the third elastic member. When the foldable electronic device is in an unfolded or folded state, the amount of movement of the first cam stroke is less than the amount of movement of the second cam stroke. According to an embodiment, the first contact angle is greater than 0 degrees and less than 20 degrees, and the second contact angle is equal to or greater than 35 degrees. According to an embodiment, when the angle between the first housing and the second housing is maintained within a defined angle range corresponding to the partially folded state, the elastic force applied by the first elastic member is set to be greater than the elastic force applied by the third elastic member and provided to the third cam.

[0170] According to an embodiment, when the angle between the first housing and the second housing is maintained within a defined angle range corresponding to the partially folded state, the compression amount of the third elastic member is set to be greater than the compression amount of the first elastic member.

[0171] According to an embodiment, the first elastic member includes a stacked structure of multiple disc springs, and the third elastic member includes a helical spring.

[0172] According to an embodiment, the foldable electronic device further includes friction members 249a1, 249a2, 249b1 and 249b2 respectively disposed in the first axis and the second axis, and support members 248a and 248b disposed to contact the friction members.

[0173] According to an embodiment, the friction member and the support member are disposed between the cam member and the first arm member or between the cam member and the second arm member.

[0174] According to an embodiment, multiple friction members and support members are alternately arranged, and the same number of friction members and support members are arranged in the first axis and the second axis.

[0175] According to an embodiment, the cam component further includes a connecting structure that connects the first fixed cam portion, the second fixed cam portion, the third fixed cam portion, and the fourth fixed cam portion.

[0176] According to an embodiment, the cam component includes a first cam component and a second cam component separate from the first cam component. The first cam component includes a first fixed cam portion, a second fixed cam portion, and a first connecting structure connecting the first fixed cam portion and the second fixed cam portion. The second cam component includes a third fixed cam portion, a fourth fixed cam portion, and a second connecting structure connecting the third fixed cam portion and the fourth fixed cam portion.

[0177] According to an embodiment, the first cam is integrally formed with one side of the first arm member, and the second cam is integrally formed with one side of the second arm member.

[0178] According to an embodiment, the first cam is integrally formed with one side of the first main gear, and the second cam is integrally formed with one side of the second main gear.

[0179] According to an embodiment, the third cam is integrally formed with one side of the first gear, and the fourth cam is integrally formed with one side of the second gear.

[0180] According to the above embodiment, the hinge structure includes: a first rotating member 211 and a second rotating member 212, the first rotating member 211 rotating about a first axis axis_A1, and the second rotating member 212 rotating about a second axis axis_A2; a first arm member 221 and a second arm member 222, the first arm member 221 rotating in response to the rotation of the first rotating member while rotating about a third axis axis_B3, and the second arm member 222 rotating in response to the rotation of the second rotating member while rotating about a fourth axis axis_B4; a first shaft 231, a first main gear disposed in the first shaft 231, and the first shaft 231 A first arm member is connected to the second shaft; a second shaft 232, in which a second main gear is disposed, and the second shaft 232 is connected to the second arm member; a third shaft 238, disposed between the first main gear and the second main gear, and a first gear 238a disposed in the third shaft 238; a fourth shaft 239, disposed between the third shaft and the second main gear, and a second gear 239a disposed in the fourth shaft 239; first cams to fourth cams 244a, 244b, 244c and 244d, respectively connected to the first shaft to the fourth shaft; a cam member 241, connected to the first shaft to the fourth shaft and including a cam facing the first cam to the fourth cam 241a, The first fixed cam portion to the fourth fixed cam portion of 241b, 241c and 241d; a first elastic member 242a connected to a first shaft to provide a first elastic force to the first cam; a second elastic member 242b connected to a second shaft to provide a first elastic force to the second cam; a third elastic member 242c connected to a third shaft to provide a second elastic force to the third cam; and a fourth elastic member 242d connected to a fourth shaft to provide a second elastic force to the fourth cam, wherein the magnitude of the slope of the first cam may be different from the magnitude of the slope of the third cam, and the type of the first elastic member may be different from the type of the third elastic member.

[0181] According to an embodiment, the size of the first contact angle between the first cam and the first fixed cam portion of the cam member can be set to be smaller than the size of the second contact angle between the third cam and the third fixed cam portion of the cam member.

[0182] Meanwhile, in the description relating to the torque provision of the aforementioned hinge structures (at least one of 201, 202, 203, and 204), the following form is shown: cams and fixed cam portions disposed on opposite sides of the folding axis (e.g., an imaginary axis intersecting the center of the first axis axis_A1 and the second axis axis_A2) are defined as a first cam structure and a second cam structure, and different types of elastic members press the first cam structure and the second cam structure; this disclosure is not limited thereto. For example, in the hinge structures (at least one of 201, 202, 203, and 204) of this disclosure, the aforementioned first cam structure may be defined as including only the first cam 244a and the first fixed cam portion 241a in the hinge structures (at least one of 201, 202, 203, and 204), and correspondingly, the elastic members pressing the first cam structure may include only the first cam elastic member 242a. Similarly, the second cam structure may include only the third cam 244c and the third fixed cam portion 241c in the hinge structure (at least one of 201, 202, 203, and 204), and the elastic member pressing the second cam structure may include only the third cam elastic member 242c, which is of a different type from the first cam elastic member 242a. Additionally, the hinge structure (at least one of 201, 202, 203, and 204) may also include: a third cam structure comprising the third cam 244c and the third fixed cam portion 241c; and a third cam elastic member 242c that presses the third cam structure; a fourth cam structure comprising the fourth cam 244d and the fourth fixed cam portion 241d; and a fourth cam elastic member 242d that presses the fourth cam structure.

[0183] According to an embodiment, the first cam elastic member 242a may include a first type of elastic member (e.g., a disc spring) as described above, and the third cam elastic member 242c may include a second type of elastic member (e.g., a coil spring). The third cam structure may be configured differently from the first cam structure (e.g., at least one of the contact angle and cam stroke of the cam and fixed cam portions is different), and the fourth cam structure may be configured differently from the second cam structure (e.g., at least one of the contact angle and cam stroke of the cam and fixed cam portions is different). As an embodiment, the second cam elastic member 242b may be configured differently from the first cam elastic member 242a (e.g., different in at least one of the type of elastic member and the magnitude of the elastic force), and the fourth cam elastic member 242d may be configured differently from the third cam elastic member 242c (e.g., at least one of the type of elastic member and the magnitude of the elastic force is different). Alternatively, each of the first cam elastic member 242a, the second cam elastic member 242b, the third cam elastic member 242c, and the fourth cam elastic member 242d can be configured to include multiple types (e.g., disc springs and coil springs), and the application ratio of the types of the first cam elastic member 242a, the second cam elastic member 242b, the third cam elastic member 242c, and the fourth cam elastic member 242d can be configured differently. Accordingly, in embodiments of this disclosure, as an example, when defining the characteristics of an assembly providing high torque, the hinge structure (at least one of 201, 202, 203, and 204) includes a first group as a first type of elastic member and a second group as a second type of elastic member. The first group includes a first cam 244a and a first fixed cam portion 241a that define a first contact angle by pressing the first cam elastic member 242a, and the second group includes a third cam and a third fixed cam portion 241c that define a second contact angle (a contact angle different from the first contact angle) by pressing the third cam elastic member 242c.

[0184] Alternatively, in embodiments of this disclosure, as an example, the hinge structures (at least one of 201, 202, 203, and 204) may be suggested as a third group of third-type elastic members (e.g., similar to or different from the first and second types of elastic members), including a second fixed cam portion 241b and a second cam 244b that define a third contact angle (e.g., a contact angle that is the same as or different from the first and second contact angles) by pressing the second cam elastic member 242b, and a fourth group of fourth-type elastic members (e.g., elastic members that are the same as or different from the first to third types of elastic members), including a fourth cam 244d and a fourth fixed cam portion 241d that define a fourth contact angle (e.g., a contact angle that is the same as or different from the first to third contact angles) by pressing the fourth cam elastic member 242d.

[0185] According to an embodiment, in the hinge structure (at least one of 201, 202, 203 and 204), the first cam 244a and the first fixed cam portion 241a can define a first contact angle by the pressure of the first cam elastic member 242a, and the third cam 244c and the third fixed cam portion 241c can define a second contact angle by the pressure of the third cam elastic member 242c. When the foldable electronic device 100 is in an unfolded state or a folded state, the size of the first contact angle can be smaller than the size of the second contact angle.

[0186] According to an embodiment, the ratio (or contribution) of the second contact angle to maintaining the foldable electronic device 100 in an unfolded or folded state can be greater than the ratio (or contribution) of the first contact angle.

[0187] According to an embodiment, additional rotational resistance occurs during rotation between the first housing and the second housing (e.g., the upper end of the cam portion is not formed flat, but has a constant tilt greater than 0), which can provide additional rotational resistance when elasticity is provided while the foldable electronics 100 is held within a specific angular range.

[0188] According to an embodiment, the first cam 244a and the first fixed cam portion 241a define a first contact angle by the pressure of the first cam elastic member 242a, and the third cam 244c and the third fixed cam portion 241c define a second contact angle by the pressure of the third cam elastic member 242c. During the period when the angle between the first housing 110 and the second housing 120 is maintained at a specific angle, the size of the first contact angle can be the same as the size of the second contact angle.

[0189] According to an embodiment, when the angle between the first housing 110 and the second housing 120 is maintained at a specific angle, the ratio of the pressure generated by the first elastic force provided by the first cam elastic member 242a to the contribution of maintaining the specific angle can be greater than the ratio of the pressure generated by the second elastic force provided by the third cam elastic member 242c to the contribution of maintaining the specific angle.

[0190] According to an embodiment, the first cam 244a and the first fixed cam portion 241a can limit the first cam stroke by the pressure of the first cam elastic member 242a, and the third cam 244c and the third fixed cam portion 241c can limit the second cam stroke by the pressure of the third cam elastic member 242c. Furthermore, when the foldable electronic device 100 is in an unfolded or folded state, the magnitude of the first cam stroke can be smaller than the magnitude of the second cam stroke. The above features can be applied in the same or similar manner as the third and fourth groups. For example, the second cam elastic member 242b of the third group can provide a third elastic force, and the magnitude of the pressure generated by the third elastic force (or the ratio of the contribution of the hinge structure (at least one of 201, 202, 203, and 204) to maintaining a specific angle) and the magnitude of the pressure generated by the fourth elastic force provided by the fourth cam elastic member 242d of the fourth group (or the ratio of the contribution of the hinge structure (at least one of 201, 202, 203, and 204) to maintaining a specific angle) can vary depending on at least one of the contact angle and cam stroke of the cam structure belonging to the corresponding group. Therefore, in the hinge structures (at least one of 201, 202, 203 and 204) disclosed herein, these groups may contribute differently to a particular state of the foldable electronic device 100 (e.g., folded state, unfolded state and flexural mode state), while in the groups including multiple cams, fixed cam portions and elastic members, the cams, fixed cam portions and elastic members belonging to at least two groups are configured differently from each other.

[0191] The foldable electronic device (100) according to this disclosure includes: a first housing (110) and a second housing (120); a hinge structure (201) connected between the first housing (110) and the second housing (120); and a flexible display (160) housed in the first housing (110) and the second housing (120), wherein the hinge structure (201) includes: a first rotating member (211) and a second rotating member (212), the first rotating member (211) being connected to the first housing (110) and the second rotating member (212) being connected to the second housing (120); a first arm member (221) and a second arm member (222). The first arm member (221) is configured to rotate in response to the rotation of the first rotating member (211), and the second arm member (222) is configured to rotate in response to the rotation of the second rotating member (212); a first shaft (231) is provided on the first shaft (231), and the first shaft (231) is connected to the first arm member (221); a second shaft (232) is provided on the second shaft (232), and the second shaft (232) is connected to the second arm member (222); a third shaft (238) is provided on the first main gear (221) and the second main gear (212). Between 222_2), and the first gear (238a) is disposed on the third shaft (238); the fourth shaft (239) is disposed between the third shaft (238) and the second main gear (222_2), and the second gear (239a) is disposed on the fourth shaft (239); the first cam to the fourth cam (244a, 244b, 244c, 244d) are connected to each of the first shaft to the fourth shaft (231, 232, 238, 239); the cam member (241) is connected to each of the first shaft to the fourth shaft (231, 232, 238, 239) and includes a first cam facing the first cam. The first fixed cam portion to the fourth fixed cam portion (241a, 241b, 241c, 241d) of the fourth cam (244a, 244b, 244c, 244d); a first elastic member (242a) connected to a first shaft (231) and configured to provide a first elastic force to the first cam (244a); a second elastic member (242b) connected to a second shaft (232) and configured to provide a first elastic force to the second cam (244b); a third elastic member (242c) connected to a third shaft (238) and configured to provide a second elastic force different from the first elastic force to the third cam (244c);A fourth elastic member (242d), coupled to a fourth shaft (239) and configured to provide a second elastic force to a fourth cam (244d), wherein the slope of the first cam (244a) is different from the slope of the third cam (244c), and wherein the type of the first elastic member (242a) is different from the type of the third elastic member (242c). According to this disclosure, when a user attempts to open or close the foldable electronic device, it can maintain controlled movement without sudden changes or deviations in resistance, allowing the user to open or close the foldable electronic device with minimal effort and optimized smoothness, and providing a safety stop function for positional stability and to prevent unintentional opening or closing.

[0192] According to various embodiments, the first cam (244a) and the first fixed cam portion (241a) form a first contact angle in response to the elastic force applied by the first elastic member (242a). The third cam (244c) and the third fixed cam portion (241c) form a second contact angle in response to the elastic force applied by the third elastic member (242c). When the foldable electronic device (100) is in the unfolded state, the size of the first contact angle is smaller than the size of the second contact angle.

[0193] According to various embodiments, the contribution of the second contact angle to maintaining the unfolded state is greater than the contribution of the first contact angle to maintaining the unfolded or folded state.

[0194] According to various embodiments, the first cam (244a) and the first fixed cam portion (241a) form a first contact angle in response to a spring force applied by the first elastic member (242a). The third cam (244c) and the third fixed cam portion (241c) form a second contact angle in response to a spring force applied by the third elastic member (242c). During the period when the angle between the first housing (110) and the second housing (120) is maintained within a defined angle range corresponding to the partially folded state, the magnitude of the first contact angle is the same as the magnitude of the second contact angle.

[0195] According to various embodiments, during rotation between the first housing (110) and the second housing (120) in a defined angle range corresponding to a partially folded state, the contribution of the elastic force applied by the first elastic member (242a) to maintaining the defined angle range is greater than the contribution of the elastic force applied by the third elastic member (242c) to maintaining the defined angle range.

[0196] According to various embodiments, the first cam (244a) and the first fixed cam portion (241a) form a first cam stroke in response to the elastic force applied by the first elastic member (242a). The third cam (244c) and the third fixed cam portion (241c) form a second cam stroke in response to the elastic force applied by the third elastic member (242c). When the foldable electronic device (100) is in an unfolded or folded state, the amount of movement of the first cam stroke is less than the amount of movement of the second cam stroke.

[0197] According to various embodiments, the first contact angle is greater than 0 degrees and less than 20 degrees. The second contact angle is 35 degrees or greater.

[0198] According to various embodiments, during the period when the angle between the first housing (110) and the second housing (120) is maintained within a defined angle range corresponding to the partially folded state, the elastic force (244a) applied by the first elastic force and provided to the first cam is greater than the elastic force (244c) applied by the third elastic force and provided to the third cam.

[0199] According to various embodiments, during the period when the angle between the first housing (110) and the second housing (120) is maintained within a defined angle range corresponding to the partially folded state, the compression of the third elastic member (242c) is greater than the compression of the first elastic member (242a).

[0200] According to various embodiments, the first elastic member (242a) comprises a stacked structure of multiple disc springs. The third elastic member (242c) comprises a helical spring.

[0201] According to various embodiments, the foldable electronic device (100) further includes a plurality of friction members (249a1, 249a2, 249b1, 249b2, 249c1, 249c2, 249c3, 249c4) disposed on each of the first axis (231) and the second axis (232), and / or a plurality of support members (218a, 218b, 218c) disposed to contact the friction members (249a1, 249a2, 249b1, 249b2, 249c1, 249c2, 249c3, 249c4).

[0202] According to various embodiments, a plurality of friction members (249a1, 249a2, 249b1, 249b2, 249c1, 249c2, 249c3, 249c4) and a plurality of support members (218a, 218b, 218c) are disposed between the cam member (241) and the first arm member (221) or between the cam member (241) and the second arm member (222).

[0203] According to various embodiments, multiple friction members (249a1, 249a2, 249b1, 249b2, 249c1, 249c2, 249c3, 249c4) and support members (218a, 218b, 218c) are arranged alternately. The number of friction members (249a1, 249a2, 249b1, 249b2, 249c1, 249c2, 249c3, 249c4) and support members (218a, 218b, 218c) provided on the first shaft (231) is equal to the number of friction members (249a1, 249a2, 249b1, 249b2, 249c1, 249c2, 249c3, 249c4) and support members (218a, 218b, 218c) provided on the second shaft (232).

[0204] According to various embodiments, the cam component (241) also includes a connecting structure that connects the first fixed cam portion (241a), the second fixed cam portion (241b), the third fixed cam portion (241c), and the fourth fixed cam portion (241d).

[0205] According to various embodiments, the cam member (241) includes a first cam member and a second cam member separate from the first cam member. The first cam member includes a first fixed cam portion (241a) facing the first cam (244a); a second fixed cam portion (241b) facing the second cam (244b); and a first connecting structure connecting the first fixed cam portion (241a) and the second fixed cam portion (241b).

[0206] The second cam component includes a third fixed cam portion (241c) facing the third cam (244c); a fourth fixed cam portion (241d) facing the fourth cam (244d); and a second connecting structure connecting the third fixed cam portion (241c) and the fourth fixed cam portion (241d).

[0207] According to various embodiments, the first cam (244a) is integrally formed with one side of the first arm member (221), and / or the second cam (244b) is integrally formed with one side of the second arm member (222).

[0208] According to various embodiments, the first cam (244a) is integrally formed with one side of the first main gear (221_2), and / or the second cam (244b) is integrally formed with one side of the second main gear (222_2).

[0209] According to various embodiments, the third cam (244c) is integrally formed with one side of the first gear (238a), and / or the fourth cam (244d) is integrally formed with one side of the second gear (239a).

[0210] The hinge structure (201) according to this disclosure includes: a first rotating member (211) configured to rotate about a first axis and a second rotating member (212) configured to rotate about a second axis; a first arm member (221) configured to rotate about a third axis in response to rotation of the first rotating member (211); a second arm member (222) configured to rotate about a fourth axis in response to rotation of the second rotating member (212); and a first shaft (231) on which a first main gear (221_2) is disposed and connected to the first arm member (221). The second shaft (232) has a second main gear (222_2) mounted on it and connected to the second arm member (222); the third shaft (238) is located between the first main gear (221_2) and the second main gear (222_2), and the first gear (238a) is mounted on the third shaft (238); the fourth shaft (239) is located between the third shaft (238) and the second main gear (222_2), and the second gear (239a) is mounted on the fourth shaft (239); the first cam to the fourth cam (244a, 244b, 244c, ... 244d), which is connected to each of the first to fourth axes (231, 232, 238, 239); cam member (241), which is connected to each of the first to fourth axes (231, 232, 238, 239) and includes a first fixed cam portion to a fourth fixed cam portion (241a, 241b, 241c, 241d) facing the first to fourth cams (244a, 244b, 244c, 244d); a first elastic member (242a), which is connected to the first axis (231) and provides a first elastic force to the first cam (244a); a second elastic member (242b), which provides a second elastic force to the first cam (244a). A first elastic member (244a) is connected to a second shaft (232) and provides a first elastic force to a second cam (244b); a third elastic member (242c) is connected to a third shaft (238) and provides a second elastic force to the third cam (244c) different from the first elastic force; a fourth elastic member (242d) is connected to a fourth shaft (239) and provides a second elastic force to the fourth cam (244d), wherein the slope of the first cam (244a) is different from the slope of the third cam (244c), and wherein the type of the first elastic member (242a) is different from the type of the third elastic member (242c). According to this disclosure, the hinge structure can facilitate controlled movement of the foldable electronic device without sudden changes or deviations in resistance, and allows the user to open or close the foldable electronic device with minimal effort and optimized smoothness, and provides a safety stop function for positional stability and to prevent unintentional opening or closing.

[0211] According to various embodiments, the size of the first contact angle of the first fixed cam portion (241a) of the cam member (241) contacting the first cam (244a) is smaller than the size of the second contact angle of the third fixed cam portion (241c) of the cam member (241) contacting the third cam (244c).

[0212] Figure 14 This is a block diagram illustrating an electronic device 1401 in a network environment 1400 according to various embodiments.

[0213] Reference Figure 14 In network environment 1400, electronic device 1401 can communicate with electronic device 1402 via a first network 1498 (e.g., a short-range wireless communication network), or with at least one of electronic device 1404 or server 1408 via a second network 1499 (e.g., a long-range wireless communication network). According to an embodiment, electronic device 1401 can communicate with electronic device 1404 via server 1408. According to an embodiment, electronic device 1401 may include a processor 1420, a memory 1430, an input module 1450, a sound output module 1455, a display module 1460, an audio module 1470, a sensor module 1476, an interface 1477, a connection terminal 1478, a haptic module 1479, a camera module 1480, a power management module 1488, a battery 1489, a communication module 1490, a subscriber identification module (SIM) 1496, or an antenna module 1497. In some embodiments, at least one of the aforementioned components (e.g., connection terminal 1478) may be omitted from electronic device 1401, or one or more other components may be added to electronic device 1401. In some embodiments, some of the aforementioned components (e.g., sensor module 1476, camera module 1480, or antenna module 1497) may be implemented as a single integrated component (e.g., display module 1460).

[0214] Processor 1420 may run software (e.g., program 1440) to control at least one other component (e.g., hardware or software component) of electronic device 1401 connected to processor 1420, and may perform various data processing or calculations. According to one embodiment, as at least part of the data processing or calculation, processor 1420 may store commands or data received from another component (e.g., sensor module 1476 or communication module 1490) in volatile memory 1432, process the commands or data stored in volatile memory 1432, and store the resulting data in non-volatile memory 1434. According to embodiments, processor 1420 may include a main processor 1421 (e.g., central processing unit (CPU) or application processor (AP)) or an auxiliary processor 1423 (e.g., graphics processing unit (GPU), neural processing unit (NPU), image signal processor (ISP), sensor central processor, or communication processor (CP)) that is operationally independent of or combined with the main processor 1421. For example, when electronic device 1401 includes a main processor 1421 and an auxiliary processor 1423, the auxiliary processor 1423 may be adapted to consume less power than the main processor 1421, or may be adapted to be dedicated to a specific function. The auxiliary processor 1423 may be implemented separately from the main processor 1421, or may be implemented as part of the main processor 1421.

[0215] When the main processor 1421 is inactive (e.g., in sleep) state, the auxiliary processor 1423 (rather than the main processor 1421) can control at least some of the functions or states associated with at least one component of the electronic device 1401 (e.g., display module 1460, sensor module 1476, or communication module 1490), or when the main processor 1421 is active (e.g., running an application), the auxiliary processor 1423 can work with the main processor 1421 to control at least some of the functions or states associated with at least one component of the electronic device 1401 (e.g., display module 1460, sensor module 1476, or communication module 1490). According to embodiments, the auxiliary processor 1423 (e.g., an image signal processor or a communication processor) may be implemented as part of another component (e.g., camera module 1480 or communication module 1490) functionally associated with the auxiliary processor 1423. According to embodiments, the auxiliary processor 1423 (e.g., a neural processing unit) may include hardware structures dedicated to artificial intelligence model processing. Artificial intelligence models can be generated through machine learning. For example, such learning can be performed via electronic device 1401 where the artificial intelligence is executed, or via a separate server (e.g., server 1408). Learning algorithms may include, but are not limited to, supervised learning, unsupervised learning, semi-supervised learning, or reinforcement learning. The artificial intelligence model may include multiple layers of artificial neural networks. The artificial neural networks may be deep neural networks (DNNs), convolutional neural networks (CNNs), recurrent neural networks (RNNs), restricted Boltzmann machines (RBMs), deep belief networks (DBNs), bidirectional recurrent deep neural networks (BRDNNs), or deep Q-networks, or combinations of two or more thereof, but are not limited to these. Additionally or optionally, the artificial intelligence model may include software structures in addition to hardware structures.

[0216] The memory 1430 may store various data used by at least one component of the electronic device 1401 (e.g., processor 1420 or sensor module 1476). The various data may include, for example, software (e.g., program 1440) and input or output data for commands associated with it. The memory 1430 may include volatile memory 1432 or non-volatile memory 1434.

[0217] The program 1440 may be stored as software in the memory 1430, and the program 1440 may include, for example, an operating system (OS) 1442, middleware 1444, or application 1446.

[0218] Input module 1450 can receive commands or data from outside electronic device 1401 (e.g., a user) that will be used by other components of electronic device 1401 (e.g., processor 1420). Input module 1450 may include, for example, a microphone, mouse, keyboard, keys (e.g., buttons), or digital pen (e.g., stylus).

[0219] The sound output module 1455 can output sound signals to the outside of the electronic device 1401. The sound output module 1455 may include, for example, a speaker or a receiver. The speaker can be used for general purposes such as playing multimedia or playing records. The receiver can be used to receive incoming calls. According to an embodiment, the receiver can be implemented separately from the speaker or as part of the speaker.

[0220] Display module 1460 can visually provide information to the outside of electronic device 1401 (e.g., to a user). Display device 1460 may include, for example, a display, a holographic device, or a projector, and control circuitry for controlling a respective one of the display, holographic device, and projector. According to an embodiment, display module 1460 may include a touch sensor adapted to detect touch or a pressure sensor adapted to measure the intensity of the force caused by touch.

[0221] The audio module 1470 can convert sound into electrical signals and vice versa. According to an embodiment, the audio module 1470 can obtain sound via the input module 1450, or output sound via the sound output module 1455 or headphones of an external electronic device (e.g., electronic device 1402) that is directly (e.g., wired) or wirelessly connected to the electronic device 1401.

[0222] Sensor module 1476 can detect the operating state of electronic device 1401 (e.g., power or temperature) or the environmental state outside electronic device 1401 (e.g., user state), and then generate an electrical signal or data value corresponding to the detected state. According to embodiments, sensor module 1476 may include, for example, a gesture sensor, gyroscope sensor, atmospheric pressure sensor, magnetic sensor, accelerometer, grip sensor, proximity sensor, color sensor, infrared (IR) sensor, biometric sensor, temperature sensor, humidity sensor, or illuminance sensor.

[0223] Interface 1477 may support one or more specific protocols used to enable electronic device 1401 to connect directly (e.g., wired) or wirelessly to external electronic device (e.g., electronic device 1402). According to embodiments, interface 1477 may include, for example, a High Definition Multimedia Interface (HDMI), a Universal Serial Bus (USB) interface, a Secure Digital Card (SD) interface, or an audio interface.

[0224] Connection 1478 may include a connector, via which electronic device 1401 may be physically connected to an external electronic device (e.g., electronic device 1402). According to embodiments, connection 1478 may include, for example, an HDMI connector, a USB connector, an SD card connector, or an audio connector (e.g., a headphone connector).

[0225] The haptic module 1479 can convert electrical signals into mechanical stimuli (e.g., vibration or motion) or electrical stimuli that can be recognized by a user through his touch or kinesthesia. According to embodiments, the haptic module 1479 may include, for example, a motor, a piezoelectric element, or an electrical stimulator.

[0226] Camera module 1480 can capture still or moving images. According to embodiments, camera module 1480 may include one or more lenses, an image sensor, an image signal processor, or a flash.

[0227] The power management module 1488 manages the power supply to the electronic device 1401. According to an embodiment, the power management module 1488 may be implemented as at least part of, for example, a power management integrated circuit (PMIC).

[0228] Battery 1489 can power at least one component of electronic device 1401. According to an embodiment, battery 1489 may include, for example, a non-rechargeable primary battery, a rechargeable rechargeable battery, or a fuel cell.

[0229] Communication module 1490 can support the establishment of a direct (e.g., wired) or wireless communication channel between electronic device 1401 and external electronic devices (e.g., electronic device 1402, electronic device 1404, or server 1408), and perform communication via the established communication channel. Communication module 1490 may include one or more communication processors capable of operating independently of processor 1420 (e.g., application processor (AP)) and support direct (e.g., wired) or wireless communication. According to embodiments, communication module 1490 may include wireless communication module 1492 (e.g., cellular communication module, short-range wireless communication module, or Global Navigation Satellite System (GNSS) communication module) or wired communication module 1494 (e.g., local area network (LAN) communication module or power line communication (PLC) module). One of these communication modules can communicate with an external electronic device via a first network 1498 (e.g., a short-range communication network such as Bluetooth, Wi-Fi Direct, or Infrared Data Association (IrDA)) or a second network 1499 (e.g., a long-range communication network such as a traditional cellular network, 5G network, next-generation communication network, the Internet, or a computer network (e.g., a LAN or a wide area network (WAN))). These various types of communication modules can be implemented as a single component (e.g., a single chip) or as multiple components separate from each other (e.g., multiple chips). The wireless communication module 1492 can identify and verify the electronic device 1401 in the communication network (such as the first network 1498 or the second network 1499) using user information (e.g., the International Mobile Subscriber Identity (IMSI)) stored in the user identification module 1496.

[0230] Wireless communication module 1492 can support 5G networks following 4G networks and next-generation communication technologies (such as new radio (NR) access technologies). NR access technologies can support enhanced mobile broadband (eMBB), massive machine-type communication (mMTC), or ultra-reliable low-latency communication (URLLC). Wireless communication module 1492 can support high-frequency bands (e.g., millimeter-wave bands) to achieve, for example, high data transmission rates. Wireless communication module 1492 can support various technologies used to ensure performance in high-frequency bands, such as, for example, beamforming, massive MIMO, full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, or massive antennas. Wireless communication module 1492 can support various requirements specified in electronic device 1401, external electronic device (e.g., electronic device 1404), or network system (e.g., second network 1499). According to an embodiment, the wireless communication module 1492 may support peak data rates (e.g., 20 Gbps or greater) for implementing eMBB, lost coverage (e.g., 164 dB or less) for implementing mMTC, or U-plane latency (e.g., 0.5 ms or less for each of the downlink (DL) and uplink (UL), or 1 ms or less round trip) for implementing URLLC.

[0231] Antenna module 1497 can transmit or receive signals or power to or from the exterior of electronic device 1401 (e.g., external electronic device). According to an embodiment, antenna module 1497 may include an antenna comprising a radiating element formed of a conductive material or conductive pattern formed in or on a substrate (e.g., a printed circuit board (PCB)). According to an embodiment, antenna module 1497 may include multiple antennas (e.g., an array antenna). In this case, at least one antenna suitable for a communication scheme used in a communication network (such as a first network 1498 or a second network 1499) can be selected from the multiple antennas by, for example, communication module 1490 (e.g., wireless communication module 1492). Signals or power can then be transmitted or received between communication module 1490 and the external electronic device via the selected at least one antenna. According to an embodiment, additional components besides the radiating element (e.g., a radio frequency integrated circuit (RFIC)) may be additionally incorporated into antenna module 1497.

[0232] According to various embodiments, antenna module 1497 can form a millimeter-wave antenna module. According to embodiments, the millimeter-wave antenna module may include a printed circuit board, a radio frequency integrated circuit (RFIC), and multiple antennas (e.g., an array antenna), wherein the RFIC is disposed on or adjacent to a first surface (e.g., a bottom surface) of the printed circuit board and is capable of supporting a specified high-frequency band (e.g., a millimeter-wave band), and the multiple antennas are disposed on or adjacent to a second surface (e.g., a top surface or a side surface) of the printed circuit board and are capable of transmitting or receiving signals in the specified high-frequency band.

[0233] At least some of the aforementioned components can be interconnected and communicate signals (e.g., commands or data) between them via an inter-peripheral communication scheme (e.g., bus, general purpose input / output (GPIO), serial peripheral interface (SPI), or mobile industrial processor interface (MIPI)).

[0234] According to an embodiment, commands or data can be sent or received between electronic device 1401 and external electronic device 1404 via server 1408 connected to a second network 1499. Each of electronic device 1402 or electronic device 1404 can be a device of the same type as electronic device 1401, or a device of a different type. According to an embodiment, all or some operations that would be performed on electronic device 1401 can be performed on one or more of external electronic devices 1402, external electronic devices 1404, or server 1408. For example, if electronic device 1401 is required to automatically perform a function or service, or is required to perform a function or service in response to a request from a user or another device, electronic device 1401 may request the one or more external electronic devices to perform at least a portion of the function or service, instead of running the function or service, or electronic device 1401 may request the one or more external electronic devices to perform at least a portion of the function or service in addition to running the function or service. Upon receiving the request, one or more external electronic devices may perform at least a portion of the requested function or service, or perform additional functions or services related to the request, and transmit the result of the execution to electronic device 1401. Electronic device 1401 may provide the result as at least a partial response to the request, with or without further processing. For this purpose, technologies such as cloud computing, distributed computing, mobile edge computing (MEC), or client-server computing may be used. Electronic device 1401 may use, for example, distributed computing or mobile edge computing to provide ultra-low latency services. In another embodiment, external electronic device 1404 may include an Internet of Things (IoT) device. Server 1408 may be an intelligent server using machine learning and / or neural networks. According to an embodiment, external electronic device 1404 or server 1408 may be included in a second network 1499. Electronic device 1401 may be applied to intelligent services based on 5G communication technology or IoT-related technologies (e.g., smart homes, smart cities, smart cars, or healthcare).

[0235] The electronic device according to various embodiments can be one of a variety of types of electronic devices. Electronic devices may include, for example, portable communication devices (e.g., smartphones), computer devices, portable multimedia devices, portable medical devices, cameras, wearable devices, or home appliances. According to embodiments of this disclosure, the electronic device is not limited to those described above.

[0236] It should be understood that the various embodiments of this disclosure and the terminology used therein are not intended to limit the technical features set forth herein to the specific embodiments, but rather to include various changes, equivalents, or substitutions to the respective embodiments. In the description of the drawings, similar reference numerals may be used to refer to similar or related elements. It will be understood that nouns in the singular form corresponding to terms may include one or more things unless the relevant context clearly indicates otherwise. As used herein, each of the phrases such as “A or B,” “at least one of A and B,” “at least one of A or B,” “A, B, or C,” “at least one of A, B, and C,” and “at least one of A, B, or C” may include any one or all possible combinations of the items enumerated together with the corresponding phrase among the plurality of phrases. As used herein, terms such as “first” and “second” or “first” and “second” may be used to simply distinguish the respective component from another component and do not limit the component in other respects (e.g., importance or order). It will be understood that, whether the terms “operably” or “communically” are used or not, if an element (e.g., a first element) is referred to as “combined with another element (e.g., a second element),” “combined to another element (e.g., a second element),” “connected to another element (e.g., a second element),” or “connected to another element (e.g., a second element)”, it means that the element can be directly (e.g., wiredly) connected to the other element, wirelessly connected to the other element, or connected to the other element via a third element.

[0237] As used in connection with various embodiments of this disclosure, the term "module" may include a unit implemented in hardware, software, or firmware, and may be used interchangeably with other terms such as "logic," "logic block," "part," or "circuit." A module may be a single integrated component adapted to perform one or more functions, or the smallest unit or part of such a single integrated component. For example, according to embodiments, a module may be implemented in the form of an application-specific integrated circuit (ASIC).

[0238] The various embodiments set forth herein can be implemented as software (e.g., program 1440) containing one or more instructions readable by a machine (e.g., electronic device 1401) stored in a storage medium (e.g., internal memory 1436 or external memory 1438). For example, under the control of a processor, the processor (e.g., processor 1420) of the machine (e.g., electronic device 1401) can invoke and execute at least one of the one or more instructions stored in the storage medium, with or without the use of one or more other components. This enables the machine to operate to perform at least one function according to the invoked at least one instruction. The one or more instructions may include code generated by a compiler or code executable by an interpreter. Machine-readable storage media can be provided in the form of non-transitory storage media. The term "non-transitory" simply means that the storage medium is a tangible device and does not include signals (e.g., electromagnetic waves), but this term does not distinguish between data being stored semi-permanently in the storage medium and data being temporarily stored in the storage medium.

[0239] According to embodiments, methods according to various embodiments of this disclosure may be included and provided in a computer program product. The computer program product can be traded as a product between a seller and a buyer. The computer program product may be distributed in the form of a machine-readable storage medium (e.g., a compact disk read-only memory (CD-ROM)) or via an app store (e.g., the Play Store). TM The computer program product may be published online (e.g., downloaded or uploaded), or may be distributed directly between two user devices (e.g., smartphones) (e.g., downloaded or uploaded). If published online, at least a portion of the computer program product may be temporarily generated, or at least a portion of the computer program product may be temporarily stored in a machine-readable storage medium (such as the memory of a manufacturer's server, an app store's server, or a forwarding server).

[0240] According to various embodiments, each of the above-described components (e.g., a module or program) may include a single entity or multiple entities, and some of the multiple entities may be separately disposed in different components. According to various embodiments, one or more of the above-described components may be omitted, or one or more other components may be added. Optionally or additionally, multiple components (e.g., modules or programs) may be integrated into a single component. In this case, according to various embodiments, the integrated component may still perform the one or more functions of each of the multiple components in the same or similar manner as the corresponding component of the multiple components performed one or more functions before integration. According to various embodiments, the operations performed by a module, program, or other component may be performed sequentially, in parallel, repeatedly, or heuristically, or one or more of the operations may be run in a different order or omitted, or one or more other operations may be added.

Claims

1. A foldable electronic device (100), the foldable electronic device (100) comprising: First housing (110) and second housing (120); A hinge structure (201) is connected between the first housing (120) and the second housing (120); as well as Flexible display (160). The hinge structure (201) includes: A first rotating member (211) and a second rotating member (212), wherein the first rotating member (211) is connected to the first housing (110) and the second rotating member (212) is connected to the second housing (120); A first arm member (221) and a second arm member (222), the first arm member (221) being configured to rotate in response to the rotation of the first rotating member (211), and the second arm member (222) being configured to rotate in response to the rotation of the second rotating member (212); A first shaft (231) is provided with a first main gear (221_2), and the first shaft is connected to the first arm member (221). The second shaft (232) is provided with a second main gear (222_2), and the second shaft (232) is connected to the second arm member (222). The third shaft (238) is disposed between the first main gear (221_2) and the second main gear (222_2), and the first gear (238a) is disposed on the third shaft (238). The fourth shaft (239) is disposed between the third shaft (238) and the second main gear (222_2), and the second gear (239a) is disposed on the fourth shaft (239). First cam, second cam, third cam, and fourth cam (244a, 244b, 244c, 244d), the first cam, the second cam, the third cam, and the fourth cam (244a, 244b, 244c, 244d) are respectively connected to the first shaft, the second shaft, the third shaft, and the fourth shaft (231, 232, 238, 239); A cam member (241) is connected to each of the first shaft, the second shaft, the third shaft, and the fourth shaft (244a, 244b, 244c, 244d), and includes a first fixed cam portion, a second fixed cam portion, a third fixed cam portion, and a fourth fixed cam portion (241a, 241b, 241c, 241d) respectively facing the first cam, the second cam, the third cam, and the fourth cam (244a, 244b, 244c, 244d). A first elastic member (242a) is coupled to the first shaft (231) and configured to provide a first elastic force to the first cam (244a); A second elastic member (242b) is coupled to the second shaft (232) and configured to provide the first elastic force to the second cam (244b); A third elastic member (242c) is coupled to the third shaft (238) and configured to provide a second elastic force to the third cam (244c) that is different from the first elastic force; A fourth elastic member (242d), which is coupled to the fourth shaft (239) and configured to provide the second elastic force to the fourth cam (244d), The slope of the first cam (244a) is different from the slope of the third cam (244c), and The type of the first elastic member (242a) is different from the type of the third elastic member (242c).

2. The foldable electronic device according to claim 1, wherein, The first cam (244a) and the first fixed cam portion (241a) form a first contact angle in response to the elastic force applied by the first elastic member (242a). The third cam (244c) and the third fixed cam portion (241c) form a second contact angle in response to the elastic force applied by the third elastic member (242c). When the foldable electronic device (100) is in the unfolded state, the size of the first contact angle is smaller than the size of the second contact angle.

3. The foldable electronic device according to claim 2, wherein, The contribution of the second contact angle to maintaining the unfolded or folded state of the foldable electronic device is greater than the contribution of the first contact angle to maintaining the unfolded or folded state.

4. The foldable electronic device according to any one of claims 1 to 3, wherein, The first cam (244a) and the first fixed cam portion (241a) form a first contact angle in response to the elastic force applied by the first elastic member (242a). The third cam (244c) and the third fixed cam portion (241c) form a second contact angle in response to the elastic force applied by the third elastic member (242c). Wherein, when the angle between the first housing (110) and the second housing (120) is maintained within a defined angle range corresponding to the partially folded state, the size of the first contact angle is the same as the size of the second contact angle.

5. The foldable electronic device according to any one of claims 1 to 4, wherein during rotation between the first housing (110) and the second housing (120) within a defined angle range corresponding to a partially folded state, the contribution of the elastic force applied by the first elastic member (242a) to maintaining the defined angle range is greater than the contribution of the elastic force applied by the third elastic member (242b) to maintaining the defined angle range.

6. The foldable electronic device according to any one of claims 1 to 5, wherein, The first cam (244a) and the first fixed cam portion (241a) form a first cam stroke in response to the elastic force applied by the first elastic member (242a). The third cam (244c) and the third fixed cam portion (241c) form a second cam stroke in response to the elastic force applied by the third elastic member (242c). When the foldable electronic device (100) is in an unfolded or folded state, the amount of movement of the first cam stroke is less than the amount of movement of the second cam stroke.

7. The foldable electronic device according to claim 2, wherein, The first contact angle is greater than 0 degrees and less than 20 degrees, wherein the second contact angle is 35 degrees or greater.

8. The foldable electronic device according to any one of claims 1 to 7, wherein, When the angle between the first housing (110) and the second housing (120) remains within a defined angle range corresponding to the partially folded state, the elastic force of the first elastic member (242a) is greater than the elastic force applied by the third elastic member (242c) and provided to the third cam (244c); and / or Wherein, when the angle between the first housing (110) and the second housing (120) is maintained within a defined angle range corresponding to the partially folded state, the compression of the third elastic member (242c) is greater than the compression of the first elastic member (242a).

9. The foldable electronic device according to any one of claims 1 to 8, wherein, The first elastic member (242a) comprises a stacked structure of multiple disc springs. The third elastic member (242c) includes a helical spring.

10. The foldable electronic device according to any one of claims 1 to 9, wherein the foldable electronic device further comprises: A plurality of friction components (249a1, 249a2, 249b1, 249b2, 249c1, 249c2, 249c3, 249c4) are disposed on each of the first shaft (231) and the second shaft (232), and Multiple support members (218a, 218b, 218c) are configured to contact the friction members (249a1, 249a2, 249b1, 249b2, 249c1, 249c2, 249c3, 249c4), and / or The plurality of friction members (249a1, 249a2, 249b1, 249b2, 249c1, 249c2, 249c3, 249c4) and the plurality of support members (218a, 218b, 218c) are disposed between the cam member (241) and the first arm member (221) or between the cam member (241) and the second arm member (222), and / or The plurality of friction components (249a1, 249a2, 249b1, 249b2, 249c1, 249c2, 249c3, 249c4) and the support components (218a, 218b, 218c) are arranged alternately. The number of friction members and support members disposed on the first shaft (231) is equal to the number of friction members and support members disposed on the second shaft (232).

11. The foldable electronic device according to any one of claims 1 to 10, wherein, The cam component (241) further includes: A connecting structure that connects the first fixed cam portion (241a), the second fixed cam portion (241b), the third fixed cam portion (241c), and the fourth fixed cam portion (241d).

12. The foldable electronic device according to any one of claims 1 to 11, wherein, The cam component (241) includes a first cam component and a second cam component separate from the first cam component. The first cam component includes: The first fixed cam portion (241a) faces the first cam (244a); The second fixed cam portion (241b) faces the second cam (244b); A first connecting structure connects the first fixed cam portion (241a) and the second fixed cam portion (241b). The second cam component includes: The third fixed cam portion (241c) faces the third cam (244c). The fourth fixed cam portion (241d) faces the fourth cam (244d). The second connection structure connects the third fixed cam portion (241c) and the fourth fixed cam portion (241d).

13. The foldable electronic device according to any one of claims 1 to 12, wherein, The first cam (244a) is integrally formed with one side of the first arm member (221). Wherein, the second cam (244b) is integrally formed with one side of the second arm member (222), and / or The first cam (244a) is integrally formed with one side of the first main gear (221_2). Wherein, the second cam (244b) is integrally formed with one side of the second main gear (222_2), and / or The third cam (244c) is integrally formed with one side of the first gear (238a). The fourth cam (244d) is integrally formed with one side of the second gear (239a).

14. A hinge structure (201), said hinge structure (201) comprising: A first rotating member (211) and a second rotating member (212), wherein the first rotating member (211) is configured to rotate about a first axis (axis_A1) and the second rotating member (212) is configured to rotate about a second axis (axis_A2); A first arm member (221) and a second arm member (222), the first arm member (221) being configured to rotate about a third axis (axis_B3) in response to the rotation of the first rotating member (211), and the second arm member (222) being configured to rotate about a fourth axis (axis_B4) in response to the rotation of the second rotating member (212); A first shaft (231) is provided with a first main gear (221_2), and the first shaft (231) is connected to the first arm member (221). The second shaft (232) is provided with a second main gear (222_2), and the second shaft (232) is connected to the second arm member (222). The third shaft (238) is disposed between the first main gear (221_2) and the second main gear (222_2), and the first gear (238a) is disposed on the third shaft (238). The fourth shaft (239) is disposed between the third shaft (238) and the second main gear (222_2), and the second gear (239a) is disposed on the fourth shaft (239). First cam, second cam, third cam, and fourth cam (244a, 244b, 244c, 244d), the first cam, the second cam, the third cam, and the fourth cam (244a, 244b, 244c, 244d) are respectively connected to the first shaft, the second shaft, the third shaft, and the fourth shaft (231, 232, 238, 239); A cam member (241) is coupled to each of the first shaft, the second shaft, the third shaft, and the fourth shaft (231, 232, 238, 239), and includes a first fixed cam portion, a second fixed cam portion, a third fixed cam portion, and a fourth fixed cam portion (241a, 241b, 241c, 241d) facing the first cam, the second cam, the third cam, and the fourth cam (244a, 244b, 244c, 244d). A first elastic member (242a) is connected to the first shaft (231) and provides a first elastic force to the first cam (244a); A second elastic member (242b) is connected to the second shaft (232) and provides the first elastic force to the second cam (244b); A third elastic member (242c) is connected to the third shaft (238) and provides a second elastic force to the third cam (244c) that is different from the first elastic force; A fourth elastic member (242d) is coupled to the fourth shaft (239) and provides the second elastic force to the fourth cam (244d). Wherein, the slope of the first cam (244a) is different from the slope of the third cam (244c), and The type of the first elastic member (242a) is different from the type of the third elastic member (242c).

15. The hinge structure according to claim 14, wherein, The size of the first contact angle at which the first fixed cam portion (241a) of the cam member (241) contacts the first cam (244a) is smaller than the size of the second contact angle at which the third fixed cam portion (241c) of the cam member (241) contacts the third cam (244c).

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