Hinge structure and Electronic device including the same

Abstract

An electronic device is disclosed. The electronic device comprises a first housing, a second housing, and a hinge structure connected to the first housing and the second housing, wherein the hinge structure comprises: a first arm shaft parallel to the axial direction and coupled to the rotation of the first housing; a second arm shaft parallel to the axial direction and coupled to the rotation of the second housing; a first arm cam and a second arm cam rotating together with the first arm shaft; a third arm cam and a fourth arm cam rotating together with the second arm shaft; a first cam member comprising a first moving cam coupled to the first arm cam and a second moving cam coupled to the third arm cam; a second cam member comprising a third moving cam coupled to the second arm cam and a fourth moving cam coupled to the fourth arm cam; and a first elastic member coupled to the first arm shaft and disposed between the first cam member and the second cam member. and a second elastic member coupled to the second arm shaft and disposed between the first cam member and the second cam member; may be included. In addition to this, various embodiments identified through the specification are possible.

Description

Technology Field

[0001] The embodiments disclosed in this document relate to a hinge structure and an electronic device including the same. Background Technology

[0002] Portable electronic devices, such as smartphones, can provide various functions, such as making calls, playing videos, and browsing the internet, based on various types of applications. Users may want to utilize the aforementioned various functions through a larger screen. However, as the screen of a portable electronic device increases, portability may decrease. Accordingly, foldable electronic devices are being developed that include a flexible display in which some areas are deformed into a curved or flat surface. The foldable electronic device may include a hinge structure to fold or unfold the flexible display.

[0003] The hinge structure of the foldable electronic device can be connected to adjacent housings so that each adjacent housing rotates at a certain angle. As the adjacent housings rotate, the flexible display can be unfolded or folded. The problem to be solved

[0004] A flexible display in a folded state may be subject to a restoring force attempting to return to an unfolded state. This restoring force can interfere with the folding operation of the foldable electronic device. To address this, the foldable electronic device may include a friction structure that provides a frictional torque of a specified magnitude to stably maintain the folded state. Due to this friction structure, a relatively larger rotational torque may be required to unfold the foldable electronic device in a folded state. For example, a user must rotate each of the housings connected to both sides of the hinge structure with a larger torque. For example, a user cannot unfold the foldable electronic device using one hand.

[0005] According to the embodiments disclosed in this document, there is an intention to provide a hinge structure that provides a semi-automatic unfolding section that unfolds further to an additional angle without additional external force when unfolded from a folded state to a certain angle, and a free-stop section that can stably maintain a folded state at various angles, and a foldable electronic device including the same. means of solving the problem

[0006] An electronic device according to embodiments disclosed in this document comprises a first housing, a second housing, and a hinge structure connected to the first housing and the second housing such that the first housing rotates about a first rotation axis (R1) parallel to the axial direction and the second housing rotates about a second rotation axis (R2) parallel to the axial direction.

[0007] The hinge structure comprises: a first arm axis parallel to the axial direction and coupled to the rotation of the first housing; a second arm axis parallel to the axial direction and coupled to the rotation of the second housing; a first arm cam and a second arm cam rotating together with the first arm axis; a third arm cam and a fourth arm cam rotating together with the second arm axis; a first cam member including a first moving cam coupled to the first arm cam and a second moving cam coupled to the third arm cam, wherein the first cam member is configured to move in the axial direction along the first arm axis and the second arm axis; a second cam member including a third moving cam coupled to the second arm cam and a fourth moving cam coupled to the fourth arm cam, wherein the second cam member is configured to move in the axial direction along the first arm axis and the second arm axis; and a first elastic member coupled to the first arm axis and disposed between the first cam member and the second cam member. and a second elastic member coupled to the second arm shaft and disposed between the first cam member and the second cam member; comprising

[0008] The electronic device comprises a free stop section defined between a fully folded state (Sf) and an unfolded state (Su), a first state (S1) defined between the free stop section and the fully folded state (Sf), and a second state (S2) defined between the free stop section and the fully folded state and being more unfolded than the first state (S1).

[0009] The hinge structure may be configured such that when the electronic device moves from the fully folded state (Sf) to the second state (S2), the first cam member is fixed at a position specified in the axial direction and the second cam member moves in the axial direction.

[0011] An electronic device according to embodiments disclosed in this document comprises a first housing, a second housing, a display (140) extending to a first surface of the first housing and a second surface of the second housing, and a hinge structure connected to the first housing and the second housing, wherein the first housing rotates about a first rotation axis (R1) and the second housing rotates about a second rotation axis (R2) parallel to the first rotation axis (R1), so that the first surface and the second surface form a predetermined interlocking angle (A).

[0012] The electronic device comprises an unfolded state (Su) in which the first surface and the second surface form a substantially continuous plane, and a fully folded state (Sf) in which the first housing and the second housing are rotated so that the edge (P1) of the first housing and the edge (P2) of the second housing are in at least partial contact.

[0013] The hinge structure comprises a first arm shaft linked to the rotation of the first housing, a first elastic member disposed on the first arm shaft to provide elastic force in the extension direction of the first arm shaft, a second arm shaft linked to the rotation of the second housing, and a second elastic member disposed on the second arm shaft to provide elastic force in the extension direction of the second arm shaft.

[0014] The hinge structure comprises: a folding detent section defined from the fully folded state (Sf) to a first state (S1) having a first pinch angle (A1), wherein each of the first elastic member and the second elastic member is compressed by a first displacement as the pinch angle (A) increases in the folding detent section; an automatic unfolding section defined from the first state (S1) to a second state (S2) having a second pinch angle (A2) greater than the first pinch angle (A1), wherein each of the first elastic member and the second elastic member is tensioned by a second displacement as the pinch angle (A) increases in the automatic unfolding section; It may include a free stop section defined from a third-1 state (S31) having a third-1 interlocking angle (A31) greater than the second interlocking angle (A2) to a third-2 state (S32) having a third-2 interlocking angle (A32) greater than the third-1 interlocking angle (A31), wherein each of the first elastic member and the second elastic member maintains a constant compression state independently of the interlocking angle (A) in the free stop section, or is compressed as the interlocking angle (A) increases; a spreading detent section defined between the third-2 state (S32) and the spreading state (Su), wherein each of the first elastic member and the second elastic member is stretched by a third displacement as the interlocking angle (A) increases in the spreading detent section. Effects of the invention

[0015] The hinge structure and electronic device according to the embodiments disclosed in this document can provide a semi-automatic unfolding operation that automatically unfolds to an additional angle when the user unfolds it from a folded state to a specified angle. In addition, the hinge structure and electronic device can provide a free-stop operation that maintains a folded state at various angles. Furthermore, the hinge structure and electronic device include two cams connected to each elastic member, thereby increasing the friction surface area of ​​the cams to ensure lifespan and operational reliability.

[0016] In addition, various effects that can be identified directly or indirectly through this document may be provided. Brief explanation of the drawing

[0017] FIG. 1 is a diagram showing an exploded perspective view of an electronic device according to one embodiment. FIG. 2a is a drawing illustrating the unfolded state of an electronic device according to one embodiment. FIG. 2b is a drawing illustrating the folded state of an electronic device according to one embodiment. FIG. 2c is a drawing showing the fully folded state of an electronic device according to one embodiment. FIG. 3 is a drawing illustrating a hinge structure according to one embodiment. FIG. 4 is an exploded perspective view of a hinge structure according to one embodiment. FIG. 5 is a drawing illustrating the friction structure of a hinge structure according to one embodiment. FIG. 6 is a drawing illustrating the rotational movement of a rotating structure of a hinge structure according to one embodiment. FIG. 7 is a drawing illustrating the rotational and sliding movements of the arm of a hinge structure and a rotating structure according to one embodiment. FIG. 8 is a drawing illustrating the cam profile of a hinge structure according to one embodiment. FIG. 9 is a drawing illustrating the compression of an elastic member of a hinge structure with respect to the pinch angle of an electronic device according to one embodiment. FIG. 10 is a drawing illustrating a hinge structure in a fully folded state and a first state according to one embodiment. FIG. 11 is a drawing illustrating a hinge structure in a second state according to one embodiment. FIG. 12 is a drawing illustrating a hinge structure of a freestop section according to one embodiment. FIG. 13 is a drawing illustrating a hinge structure in an unfolded state according to one embodiment. FIG. 14 is a drawing illustrating the friction structure of a hinge structure according to another embodiment. FIG. 15 is a drawing illustrating another example of a cam of a hinge structure according to one embodiment. FIG. 16 is a drawing illustrating another example of the first cam structures and second cam structures of a hinge structure according to one embodiment. In relation to the description of the drawings, the same or similar reference numerals may be used for identical or similar components. Specific details for implementing the invention

[0018] Hereinafter, various embodiments of the present invention are described with reference to the accompanying drawings. However, this is not intended to limit the present invention to specific embodiments and should be understood to include various modifications, equivalents, and / or alternatives of the embodiments of the present invention.

[0019] FIG. 1 is a diagram showing an exploded perspective view of an electronic device according to one embodiment.

[0020] Referring to FIG. 1, the electronic device (100) may include a first housing (110), a second housing (120), a hinge housing (130), a hinge structure (200), and a display (140).

[0021] In one embodiment, the first housing (110) may be connected to the second housing (120) using a hinge structure (200). The first housing (110) may include a first plate (111) on which the display (140) is seated and a first frame (112) surrounding at least a portion of the first plate (111). For example, the first frame (112) may form a portion of the surface (e.g., side) of the electronic device (100). For example, a portion of the first region (141) and the folding region (143) of the display (140), respectively, may be placed on the first plate (111). A first rotational structure (210) of the hinge structure (200) may be connected to the first plate (111). In one embodiment, at least a portion of the first housing (110) may be bonded to the first region (141) of the display (140). Alternatively, a portion of the front edge of the first housing (110) may be bonded to the edge of the first region (141) of the display (140). In this regard, an adhesive layer may be disposed between the first plate (111) of the first housing (110) and the first region (141) of the display (140).

[0022] In one embodiment, the first housing (110) may be provided with at least a portion of its interior in a hollow form. A first circuit board (151), a first battery (153), and a camera module (156) may be disposed inside the first housing (110). The first circuit board (151) and the first battery (153) may be electrically connected to a second circuit board (152) and a second battery (154) disposed inside the second housing (120) via a flexible substrate. For example, a processor and memory may be disposed on the first circuit board (151). For example, the first battery (153) and the first circuit board (151) may be disposed on the first plate (111). In one embodiment, the first housing (110) may be formed, for example, with at least a portion made of a metal material, or provided with at least a portion made of a non-metal material. The first housing (110) may be formed of a material having a certain degree of rigidity so as to support at least a portion of the display (140). In one embodiment, the portion of the first housing (110) facing the second housing (120) may include a recessed portion having a certain curvature so that a hinge housing (130) can be placed therein.

[0023] In various embodiments, the first housing (110) may include a first decorative member (113) surrounding the edge of the display (140) and a first rear cover (119) facing the first plate (111) to form the surface of the electronic device (100). For example, the first decorative member (113) may be positioned to cover at least a portion of the edge of the first region (141) and the folding region (143) of the display (140). For example, the first rear cover (119) may form the rear of the electronic device (100) in an unfolded state (e.g., FIG. 2a), and the display (140) may form the front of the electronic device.

[0024] In one embodiment, the second housing (120) may be connected to the first housing (110) via a hinge structure (200). The second housing (120) may include a second plate (121) on which the display (140) is seated and a second frame (122) surrounding at least a portion of the second plate (121). For example, the second frame (122) may form a portion of the surface (e.g., side) of the electronic device (100). For example, a portion of the second region (142) and the folding region (143), respectively, may be disposed on the second plate (121). A second rotational structure (220) of the hinge structure (200) may be connected to the second plate (121). In one embodiment, at least a portion of the second housing (120) may be bonded to the second region (142) of the display (140). Alternatively, a portion of the front edge of the second housing (120) may be bonded to the edge of the second region (142) of the display (140). In this regard, an adhesive layer may be disposed between the second plate (121) of the second housing (120) and the second region (142) of the display (140).

[0025] In one embodiment, the second housing (120) may be provided with at least a portion of its interior in a hollow form. A second circuit board (152) and a second battery (154) may be disposed inside the second housing (120). The second circuit board (152) and the second battery (154) may be electrically connected to a first circuit board (151) and / or a first battery (153) disposed inside the first housing (110) via a flexible substrate. For example, the second battery (154) and the second circuit board (152) may be disposed on a second plate (121). In one embodiment, the second housing (120) may be formed, for example, with at least a portion made of a metal material, or provided with at least a portion made of a non-metal material. The second housing (120) may be formed of a material having a certain amount of rigidity so as to support at least a portion of the display (140). In one embodiment, the portion of the second housing (120) facing the first housing (110) may include a recessed portion having a certain curvature so that a hinge housing (130) can be placed therein.

[0026] In various embodiments, the second housing (120) may include a second decorative member (123) surrounding the edge of the display (140) and a second rear cover (129) facing the second plate (121) to form the surface of the electronic device (100). For example, the second decorative member (123) may be positioned to cover the edge of a portion of the second region (142) and the folding region (143) of the display (140). For example, the second rear cover (129) may form the rear of the electronic device (100) in an unfolded state (e.g., FIG. 2a), and the display (140) may form the front of the electronic device.

[0027] In various embodiments, a lattice structure (not shown) and / or a bracket (not shown) disposed between the display (140) and the adhesive layer may be further included. The lattice structure may include a slit area comprising a plurality of slits that at least partially overlap the folding area (143). Each of the plurality of slits may extend long in the extension direction (e.g., y-axis) of the folding area (143). The plurality of slits may support the folding area (143), which is flat in the unfolded state (e.g., FIG. 2a), and may support the folding area (143) to be deformed during a folding or unfolding operation. In various embodiments, only some of the lattice structure or the bracket may be laminated to the display (140).

[0028] In one embodiment, the hinge housing (130) may be disposed in the recessed portions of the first housing (110) and the second housing (120), respectively. The hinge housing (130) may be provided in a shape that extends long in the y-axis direction overall. A boss for fixing the hinge structure (200) may be disposed in a portion of the inner surface of the hinge housing (130).

[0029] In one embodiment, at least a portion of the display (140) may have flexibility. For example, the display (140) may include a first region (141) disposed on a first housing (110), a second region (142) disposed on a second housing (120), and a folding region (143) located between the first region (141) and the second region (142). In one embodiment, the first region (141) and the second region (142) may be formed as flat surfaces, and the folding region (143) may be formed to be deformable into a flat or curved surface.

[0030] According to various embodiments, the hinge structure (200) may include a first rotational structure (210) connected to a first housing (110) and a second rotational structure (220) connected to a second housing (120). The hinge structure (200) may be configured such that the first rotational structure (210) and the second rotational structure (220) can rotate about their respective rotational axes (e.g., a virtual axis parallel to the y-axis direction). For example, when the first housing (110) and the second housing (120) are folded or unfolded, the first rotational structure (210) and the second rotational structure (220) can rotate about their respective rotational axes.

[0032] FIG. 2a is a drawing illustrating the unfolded state of an electronic device according to one embodiment. FIG. 2b is a drawing illustrating the folded state of an electronic device according to one embodiment. FIG. 2c is a drawing showing the fully folded state of an electronic device according to one embodiment.

[0033] In one embodiment, the first housing (110) and the second housing (120) may rotate in opposite directions by their respective rotation axes. For example, in a folding operation performed from an unfolded state, the first housing (110) may rotate clockwise and the second housing (120) may rotate counterclockwise.

[0034] In one embodiment, an axial direction parallel to the rotation axis of each of the first housing (110) and the second housing (120) may be defined. The axial direction may be defined as the extension direction of the folding area (143) of the display (140). For example, the axial direction may be defined as the long side direction of the folding area (143). For example, the axial direction may mean a direction parallel to the y-axis of FIG. 1.

[0035] To describe the state of an electronic device according to one embodiment of the present invention, a first edge (P1) and a second edge (P2) of the electronic device (100) parallel to the axial direction may be defined. To describe the state of the electronic device (100), a third edge (P3) and a fourth edge (P4) of the electronic device (100) perpendicular to the axial direction may be defined. For example, the first edge (P1) and the third edge (P3) may include a part of the first frame (112) of the first housing (110). For example, the second edge (P2) and the fourth edge (P4) may include a part of the second frame (122) of the second housing (120).

[0036] The unfolded state of the electronic device is described with reference to Fig. 2a.

[0037] For example, the unfolded state may include a state in which the folding area (143) of the display (140) is flat. For example, the unfolded state may include a state in which the first area (141) and the second area (142) of the display (140) are formed as planes facing the same direction. For example, the unfolded state may include a state in which the first normal vector (n1) of the first area (141) of the display (140) and the second normal vector (n2) of the second area (142) are parallel. For example, the unfolded state may include a state in which the third edge (P3) and the fourth edge (P4) form substantially one straight line. For example, the unfolded state may include a state in which the third edge (P3) and the fourth edge (P4) form 180 degrees.

[0038] The folded state of the electronic device is described with reference to Fig. 2b.

[0039] For example, the folded state may include a state in which the folding area (143) of the display (140) is curved. For example, the folded state may include a state in which the first normal vector (n1) of the first area (141) and the second normal vector (n2) of the second area (142) form a predetermined angle other than 180 degrees. For example, the folded state may include a state in which the third edge (P3) and the fourth edge (P4) form a predetermined angle other than 180 degrees.

[0040] The fully folded state of the electronic device is described with reference to Fig. 2c.

[0041] For example, a fully folded state may mean a state in which the first edge (P1) and the second edge (P2) are substantially in contact during the folded state. For example, the folding area (143) of the fully folded state may be formed of a curved surface having a greater curvature than the folding area (143) of the folded state.

[0042] Referring to FIGS. 2b and 2c, in the folded state and the fully folded state, at least a portion of the hinge housing (130) may form the surface of the electronic device (100). For example, the hinge housing (130) may be visually exposed between the first housing (110) and the second housing (120).

[0044] FIG. 3 is a drawing illustrating a hinge structure according to one embodiment. FIG. 4 is an exploded perspective view of a hinge structure according to one embodiment. FIG. 3(a) is a plan view of the hinge structure viewed from the +z-axis direction. FIG. 3(b) is a plan view of the hinge structure viewed from the -z-axis direction.

[0045] Referring to FIGS. 3 and 4, the axial direction may be defined. The axial direction may be a direction parallel to the extension direction of the first rotation axis (R1) and the second rotation axis (R2). The first axial direction (①) may be a direction toward the fixed structure (230), and the second axial direction (②) may be a direction toward the second cam member (280).

[0046] In one embodiment, the hinge structure (200) may include a fixed structure (230), a first rotating structure (210), a second rotating structure (220), an arm structure (201), and a friction structure (202).

[0047] In one embodiment, the fixed structure (230) may be fixedly positioned, at least a portion thereof, inside a hinge housing (e.g., the hinge housing (130) of FIG. 1). The first rotating structure (210) and the second rotating structure (220) may be rotatably coupled to the fixed structure (230).

[0048] In one embodiment, the fixed structure (230) may include a first opening area (2391) to which the first guide portion (211) of the first rotating structure (210) is coupled. In one embodiment, the fixed structure (230) may include a first guide rail (233) for guiding the rotation path of the first rotating structure (210). For example, the first guide rail (233) may be formed on a side wall of the first opening area (2391). For example, the first guide rail (233) may be formed on at least one of the two side walls facing the axial direction of the first opening area (2391). In one embodiment, the first protruding portion (213) of the first rotating structure (210) may be received in the first guide rail (233).

[0049] In one embodiment, the fixed structure (230) may include a second opening area (2392) to which the second guide portion (221) of the second rotating structure (220) is coupled. In one embodiment, the fixed structure (230) may include a second guide rail (234) for guiding the rotation path of the second rotating structure (220). For example, the second guide rail (234) may be formed on the side wall of the second opening area (2392). For example, the second guide rail (234) may be formed on at least one of the two side walls facing the axial direction of the second opening area (2392). In one embodiment, the second protruding portion (223) of the second rotating structure (220) may be received in the second guide rail (234).

[0050] In one embodiment, the first rotating structure (210) may be configured to rotate along a predetermined path relative to a fixed structure (230) fixedly positioned on the hinge housing when the first housing (e.g., the first housing (110) of FIG. 1) is folded or unfolded. In one embodiment, the first rotating structure (210) may include a first guide portion (211) rotatably coupled to the fixed structure (230), and a first connecting portion (212) connected to the first housing (110). The first connecting portion (212) may be folded or unfolded together with the first housing (110) when the electronic device (100) is folded or unfolded. In one embodiment, the first protruding portion (213) may include a portion protruding axially from the first guide portion (211). In one embodiment, the first rotating structure (210) may include a first protrusion (213) formed in the first guide portion (211). The first protrusion (213) may guide the rotation path of the first rotating structure (210) together with the first guide rail (233).

[0051] In one embodiment, the second rotating structure (230) may be configured to rotate along a predetermined path relative to a fixed structure (230) fixedly positioned in the hinge housing when the second housing (e.g., the second housing (120) of FIG. 1) is folded or unfolded. In one embodiment, the second rotating structure (220) may include a second guide portion (221) rotatably coupled to the fixed structure (230), and a second connecting portion (222) connected to the second housing (120). The second connecting portion (222) may be folded or unfolded together with the second housing (120) when the electronic device (100) is folded or unfolded. In one embodiment, the second protruding portion (223) may include a portion protruding axially from the second guide portion (221). In one embodiment, the second rotating structure (220) may include a second protruding portion (223) formed on the second guide portion (221). The second protruding portion (223) may guide the rotation path of the second rotating structure (220) together with the second guide rail (234).

[0052] In one embodiment, the arm structure (201) may include a first arm axis (241), a second arm axis (242), a first arm portion (250), a second arm portion (260), and an interlocking structure (203).

[0053] In one embodiment, the interlocking structure (203) can interlock the first rotating structure (210) and the second rotating structure (220) so that the first rotating structure (210) and the second rotating structure (220) rotate in opposite directions by the same angle. In one embodiment, the interlocking structure (203) may include a first gear (243) formed on the outer surface of the first female shaft (241), a second gear (244) formed on the outer surface of the second female shaft (242), and connecting gears (245) connecting the first gear (243) and the second gear (244). For example, the connecting gears (245) may include an even number of gears. For example, the first gear (243) of the first female shaft (241) and the second gear (244) of the second female shaft (242) may be connected through an even number of connecting gears (245). Thus, the first arm shaft (241) and the second arm shaft (242) can be connected to rotate in opposite directions and rotate by the same angle. The first arm (250) coupled to the first arm shaft (241) and the second arm (260) coupled to the second arm shaft (242) can rotate in opposite directions and rotate by the same angle. Accordingly, the first rotating structure (210) and the second rotating structure (220) can rotate in opposite directions and rotate by the same angle.

[0054] In one embodiment, the first arm shaft (241) may be rotatably coupled to a fixed structure (230). For example, the first arm shaft (241) may be extended in a second axial direction (②) from the fixed structure (230). For example, the first axial direction (①) end of the first arm shaft (241) may be rotatably inserted into a recess or opening formed in the fixed structure (230). For example, a first fixing ring (248) may be coupled to the second axial direction (②) end of the first arm shaft (241). The first fixing ring (248) may prevent the first arm shaft (241) from detaching from the second coupling portion (252) of the first arm portion (250). In one embodiment, the first arm shaft (241) can penetrate the first connecting portion (251), the first cam member (270), the first elastic member (291), the second cam member (280), and the second connecting portion (252) of the first arm (250) when viewed from the fixed structure (230) in the second axial direction (②). For example, the first connecting portion (251) and the second connecting portion (252) of the first arm (250) can be coupled to the first arm shaft (241) to rotate together with the first arm shaft (241). For example, the first connecting portion (251) and the second connecting portion (252) can be pressed into the first arm shaft (241). For example, the first cam member (270) and the second cam member (280) can be penetrated by the first arm shaft (241). The first cam member (270) and the second cam member (280) may move linearly in the axial direction along the first arm axis (241) without rotating together with the first arm axis (241). For example, the first elastic member (291) may include a coil spring surrounding the first arm axis (241). The first elastic member (291) may be compressed or stretched in the axial direction without rotating together with the first arm axis (241).

[0055] In one embodiment, the first arm (250) rotates together with the first arm shaft (241) when the first rotating structure (210) rotates and can slide relative to the first rotating structure (210). In one embodiment, the first arm (250) may include a first connecting part (251) and a second connecting part (252) that are coupled to the first arm shaft (241), and a first extension part (253) including a first sliding pin (256). The first connecting part (251) and the second connecting part (252) may be connected in a direction perpendicular to the axial direction from the first extension part (253).

[0056] In one embodiment, a first female cam (254) may be formed in the first coupling portion (251), and a second female cam (255) may be formed in the second coupling portion. For example, the first female cam (254) may engage with the first moving cam (271) of the first cam member (270). For example, the second female cam (255) may engage with the third moving cam (281) of the second cam member (280). In one embodiment, the first female cam (254) and the second female cam (255) may be formed to face each other. For example, the first female cam (254) may include a protrusion protruding in the second axial direction (②), and the second female cam (255) may include a protrusion protruding in the first axial direction (①).

[0057] In one embodiment, with respect to the rotation of the first arm portion (250), the first connecting portion (251) and the second connecting portion (252) may be pressed into the first arm shaft (241). Thus, the first connecting portion (251) and the second connecting portion (252) rotate together with the first arm shaft (241), and the first extension portion (253) may rotate around the first arm shaft (241). In one embodiment, the first connecting portion (251) and the second connecting portion (252) may be spaced apart in the axial direction. For example, the first connecting portion (251) may be located in the first axial direction (①) relative to the second connecting portion (252). For example, between the first connecting part (251) and the second connecting part (252), a first elastic member (291), a part of the first cam member (270), and a part of the second cam member (280) may be disposed.

[0058] In one embodiment, regarding the sliding movement of the first arm portion (250), the first sliding pin (256) of the first extension portion (253) may be fastened to the first rotating structure (210). For example, at least a portion of the first sliding pin (256) may be received in the first sliding groove (e.g., the first sliding groove (215) of FIG. 7) of the first rotating structure (210). For example, the first sliding pin (256) may move along the first sliding groove (215) when the first rotating structure (210) rotates. A fixing ring (2561) may be attached to the end of the first sliding pin (256). In one embodiment, when the first rotating structure (210) rotates around the first rotation axis (R1), the first arm (250) rotates around the first arm axis (241), and at the same time, the first arm (250) can slide relative to the first rotating structure (210). For example, the first arm (250) can slide while the first sliding pin (256) is fastened to the first rotating structure (210).

[0059] In one embodiment, the second arm shaft (242) may be rotatably coupled to the fixed structure (230). For example, the second arm shaft (242) may be extended in a second axial direction (②) from the fixed structure (230). For example, the first axial direction (①) end of the second arm shaft (242) may be rotatably inserted into a recess or opening formed in the fixed structure (230). For example, a second fixing ring (249) may be coupled to the second axial direction (②) end of the second arm shaft (242). The second fixing ring (249) may prevent the second arm shaft (242) from disengaging from the fourth coupling portion (262) of the second arm portion (260). In one embodiment, the second arm shaft (242) can penetrate the third connecting portion (261) of the second arm (260), the first cam member (270), the second elastic member (292), the second cam member (280), and the fourth connecting portion (262) of the second arm (260) when viewed from the fixed structure (230) in the second axial direction (②). For example, the third connecting portion (261) and the fourth connecting portion (262) of the second arm (260) can be coupled to the second arm shaft (242) so as to rotate together with the second arm shaft (242). For example, the third connecting portion (261) and the fourth connecting portion (262) can be pressed into the second arm shaft (242). For example, the first cam member (270) and the second cam member (280) can be penetrated by the second arm shaft (242). The first cam member (270) and the second cam member (280) may move linearly in the axial direction along the second arm axis (242) without rotating together with the second arm axis (242). For example, the second elastic member (292) may include a coil spring surrounding the second arm axis (242). The second elastic member (292) may be compressed or stretched in the axial direction without rotating together with the second arm axis (242).

[0060] In one embodiment, the second arm (260) rotates together with the second arm shaft (242) when the second rotating structure (220) rotates and can slide relative to the second rotating structure (220). In one embodiment, the second arm (260) may include a third connecting part (261) and a fourth connecting part (262) that are coupled to the second arm shaft (242), and a second extension part (263) including a second sliding pin (266). The third connecting part (261) and the fourth connecting part (262) may be connected in a direction perpendicular to the axial direction from the second extension part (263).

[0061] In one embodiment, a third female cam (264) may be formed in the third connecting portion (261), and a fourth female cam (265) may be formed in the fourth connecting portion (262). For example, the third female cam (264) may engage with the second moving cam (272) of the first cam member (270). For example, the fourth female cam (265) may engage with the fourth moving cam (282) of the second cam member (280). In one embodiment, the third female cam (264) and the fourth female cam (265) may be formed to face each other. For example, the third female cam (264) may include a protrusion protruding in the second axial direction (②), and the fourth female cam (265) may include a protrusion protruding in the first axial direction (①).

[0062] In one embodiment, with respect to the rotation of the second arm portion (260), the third connecting portion (261) and the fourth connecting portion (262) may be pressed into the second arm shaft (242). Thus, the third connecting portion (261) and the fourth connecting portion (262) rotate together with the second arm shaft (242), and the second extension portion (263) may rotate around the second arm shaft (242). In one embodiment, the third connecting portion (261) and the fourth connecting portion (262) may be spaced apart in the axial direction. For example, the third connecting portion (261) may be located in the first axial direction (①) relative to the fourth connecting portion (262). For example, a second elastic member (292), another part of the first cam member (270), and another part of the second cam member (280) may be disposed between the third connecting part (261) and the fourth connecting part (262).

[0063] In one embodiment, regarding the sliding movement of the second arm (260), the second sliding pin (266) of the second extension part (263) may be fastened to the second rotating structure (220). For example, at least a portion of the second sliding pin (266) may be received in the second sliding groove (e.g., the second sliding groove (225) of FIG. 7) of the second rotating structure (220). For example, the second sliding pin (266) may move along the second sliding groove when the second rotating structure (220) rotates. A fixing ring (2661) may be attached to the end of the second sliding pin (266). In one embodiment, when the second rotating structure (220) rotates around the second rotation axis (R2), the second arm (260) rotates around the second arm axis (242), and at the same time, the second arm (260) can slide relative to the second rotating structure (220). For example, the second arm (260) can slide while the second sliding pin (266) is attached to the second rotating structure (220).

[0065] FIG. 5 is a drawing illustrating the friction structure of a hinge structure according to one embodiment.

[0066] In one embodiment, the friction structure (202) may provide a friction torque corresponding to the restoring torque of the flexible display (140). For example, in a folded state (e.g., FIG. 2b and FIG. 2c) where a portion of the display (140) is curved, a restoring force of the display (140) may act on each of the first rotating structure (210) connected to the first plate (111) and the second rotating structure (220) connected to the second plate (121). For example, the restoring force of the display (140) may be a force that seeks to return to a flat state. A restoring torque may act on each of the first arm axis (241) and the second arm axis (242) by the restoring force. The restoring torque may act in the unfolding direction of the electronic device (100) and the hinge structure (200). The restoring torque acting on the first arm shaft (241) may act in the opposite direction to the restoring torque acting on the second arm shaft (242). For example, referring to FIG. 7, the restoring torque may act on the first arm shaft (241) in a counterclockwise direction, which is the unfolding direction, and on the second arm shaft (242) in a clockwise direction, which is the unfolding direction. Accordingly, the friction structure (202) may provide a certain friction torque that offsets the restoring torque so that the hinge structure (200), electronic device (100), and / or display (140) maintain a certain folded state. For example, the friction torque may be proportional to the surface friction force between the cam structures and the distance between the point where the friction force occurs and the arm shafts (241, 242) (e.g., the radius of the arm shafts (241, 242)). The surface friction force may be increased by the compressed elastic member (291, 292).

[0067] In one embodiment, the friction structure (202) may include a first female cam (254), a second female cam (255), a third female cam (264), a fourth female cam (265), a first cam member (270), a second cam member (280), a first elastic member (291), and a second elastic member (292).

[0068] FIG. 5(b) is a drawing illustrating friction structures coupled to the first arm shaft (241). Referring to FIG. 5(a), the first arm shaft (241) may be coupled with a first arm cam (254), a first moving cam (271) of a first cam member (270), a first elastic member (291), a third moving cam (281) of a second cam member (280), and a second arm cam (255) when viewed from the first gear (243) in the second axial direction (②).

[0069] FIG. 5(a) is a drawing illustrating friction structures coupled to the second arm shaft (242). Referring to FIG. 5(b), the second arm shaft (242) may be coupled with a third arm cam (264), a second moving cam (272) of the first cam member (270), a second elastic member (292), a fourth moving cam (282) of the second cam member (280), and a fourth arm cam (265), when viewed from the second gear (244) in the second axial direction (②).

[0070] In one embodiment, the first female cam (254) may be formed on the first coupling portion (251) of the first female portion (250). The first female cam (254) may rotate together with the first female shaft (241). For example, the first female cam (254) may be formed to surround the first female shaft (241). The first female cam (254) may include a protrusion protruding in the first axial direction (①). The first female cam (254) may engage with the first moving cam (271) of the first cam member (270).

[0071] In one embodiment, the second female cam (255) may be formed on the second coupling portion (252) of the first female portion (250). The second female cam (255) may rotate together with the first female shaft (241). For example, the second female cam (255) may be formed to surround the first female shaft (241). The second female cam may include a protrusion protruding in the second axial direction (②). The second female cam (255) may engage with the third moving cam (281) of the second cam member (280).

[0072] In one embodiment, the third arm cam (264) may be formed on the third coupling portion (261) of the second arm portion (260). The third arm cam (264) may rotate together with the second arm shaft (242). For example, the third arm cam (264) may be formed to surround the second arm shaft (242). The third arm cam (264) may include a protrusion protruding in the first axial direction (①). The third arm cam (264) may engage with the second moving cam (272) of the first cam member (270).

[0073] In one embodiment, the fourth arm cam (265) may be formed on the fourth coupling portion (262) of the second arm portion (260). The fourth arm cam (265) may rotate together with the second arm shaft (242). For example, the fourth arm cam (265) may be formed to surround the second arm shaft (242). The fourth arm cam (265) may include a protrusion that protrudes in the second axial direction (②). The fourth arm cam (265) may engage with the fourth moving cam (282) of the second cam member (280).

[0074] In one embodiment, the first cam member (270) may include a first portion (270a) through which the first arm shaft (241) passes, a second portion (270b) through which the second arm shaft (242) passes, and a first bridge portion (270c) connecting the first portion (270a) and the second portion (270b). In one embodiment, a first moving cam (271) may be formed in the first portion (270a). The first moving cam (271) may engage with the first arm cam (254). For example, the first moving cam (271) may include a portion protruding in the first axial direction (①). In one embodiment, a second moving cam (272) may be formed in the second portion (270b). The second moving cam (272) may engage with the third arm cam (264). For example, the second moving cam (272) may include a portion protruding in the first axial direction (①). In one embodiment, when the first arm shaft (241) and the second arm shaft (242) rotate, the first cam member (270) may move in the axial direction without rotating. For example, the first arm shaft (241) may include a portion having a polygonal cross-section when viewed in a cross-section perpendicular to the axial direction. The first portion (270a) of the first cam member (270) may have a circular through hole when viewed in a cross-section perpendicular to the axial direction. The portion having a polygonal cross-section of the first arm shaft (241) may extend through the through hole of the circular cross-section of the first portion (270a). Thus, the first cam member (270) may not rotate even when the first arm shaft (241) rotates.

[0075] In one embodiment, the second cam member (280) may include a third portion (280a) through which the first arm shaft (241) passes, a fourth portion (280b) through which the second arm shaft (242) passes, and a second bridge portion (280c) connecting the third portion (280a) and the fourth portion (280b). In one embodiment, a third moving cam (281) may be formed in the third portion. The third moving cam (281) may engage with the second arm cam (255). For example, the third moving cam (281) may include a portion protruding in the second axial direction (②). In one embodiment, a fourth moving cam (282) may be formed in the fourth portion (280b). The fourth moving cam (282) may engage with the fourth arm cam (265). For example, the fourth moving cam (282) may include a portion protruding in the second axial direction (②). In one embodiment, when the first arm shaft (241) and the second arm shaft (242) rotate, the second cam member (280) may move in the axial direction without rotating. For example, the second arm shaft (242) may include a portion having a polygonal cross-section when viewed in a cross-section perpendicular to the axial direction. The second portion (270b) of the first cam member (270) may have a circular through hole when viewed in a cross-section perpendicular to the axial direction. The portion having a polygonal cross-section of the second arm shaft (242) may extend through the through hole of the circular cross-section of the second portion (270b). Thus, the first cam member (270) may not rotate even when the second arm shaft (242) rotates.

[0076] In one embodiment, the first elastic member (291) may be positioned between the first cam member (270) and the second cam member (280). For example, the first elastic member (291) may be positioned between the first connecting portion (251) of the first arm (250) and the second connecting portion (252) of the first arm (250). For example, the first elastic member (291) may be positioned between the first portion (270a) of the first cam member (270) and the third portion (280a) of the second cam member (280). For example, the first elastic member (291) may be positioned in the first axial direction (①) from the first cam member (270) and in the second axial direction (②) from the second cam member (280). In one embodiment, the first elastic member (291) may be compressed or stretched in response to the axial linear movement of the first cam member (270) and the second cam member (280). For example, the compressed first elastic member (291) may increase the frictional force between the first moving cam (271) and the first arm cam (254), and / or the frictional force between the third moving cam (281) and the second arm cam (255). The increased frictional force may provide increased frictional torque opposite to the rotational direction of the first arm shaft (241).

[0077] In one embodiment, the second elastic member (292) may be positioned between the first cam member (270) and the second cam member (280). For example, the second elastic member (292) may be positioned between the third connecting portion (261) of the second arm (260) and the fourth connecting portion (262) of the second arm (260). For example, the second elastic member (292) may be positioned between the second portion (270b) of the first cam member (270) and the fourth portion (280b) of the second cam member (280). For example, the second elastic member (292) may be positioned in the first axial direction (①) from the first cam member (270) and in the second axial direction (②) from the second cam member (280). In one embodiment, the second elastic member (292) may be compressed or stretched in response to the axial linear movement of the first cam member (270) and the second cam member (280). For example, the compressed second elastic member (292) may increase the frictional force between the second moving cam (272) and the third arm cam (264), and / or the frictional force between the fourth moving cam (282) and the fourth arm cam (265). The increased frictional force may provide increased frictional torque opposite to the rotational direction of the second arm shaft (242).

[0078] In one embodiment, the structures included in the friction structure (202) may rotate in place when the first arm axis (241) and the second arm axis (242) rotate, or may move linearly along the first arm axis (241) and the second arm axis (242).

[0079] For example, the first female cam (254) and the second female cam (255) may rotate together with the first female shaft (241) and may not move linearly in the extension direction of the first female shaft (241). For example, the first female shaft (241) may include a portion having a polygonal cross-section when viewed in a cross-section perpendicular to the axial direction. Each of the first female cam (254) and the second female cam (255) may have a through hole through which the first female shaft (241) passes. The through hole may have a polygonal cross-section corresponding to the cross-section of the first female shaft (241) when viewed in a cross-section perpendicular to the axial direction. Thus, when the first female shaft (241) rotates, the first female cam (254) and the second female cam (255) may rotate together with the first female shaft (241). In various embodiments, the first female cam (254) and the second female cam (255) may be pressed at least partially into the first female shaft (241) so that linear movement along the first female shaft (241) may be restricted.

[0080] For example, the third female cam (264) and the fourth female cam (265) may rotate together with the second female shaft (242) and may not move linearly in the extension direction of the second female shaft (242). For example, the second female shaft (242) may include a portion having a polygonal cross-section when viewed in a cross-section perpendicular to the axial direction. Each of the third female cam (264) and the fourth female cam (265) may have a through hole through which the second female shaft (242) passes. The through hole may have a polygonal cross-section corresponding to the cross-section of the second female shaft (242) when viewed in a cross-section perpendicular to the axial direction. Thus, when the second female shaft (242) rotates, the third female cam (264) and the fourth female cam (265) may rotate together with the second female shaft (242). In various embodiments, the third female cam (264) and the fourth female cam (265) may be pressed at least partially into the second female shaft (242) so that linear movement along the second female shaft (242) is restricted.

[0081] For example, the first moving cam (271) and the second moving cam (272) can move linearly together in the axial direction by the first bridge portion (270c) without rotating when the arm shaft (241, 242) rotates. For example, the third moving cam (281) and the fourth moving cam (282) can move linearly together in the axial direction by the second bridge portion (280c) without rotating when the arm shaft (241, 242) rotates. For example, the first elastic member (291) and the second elastic member (292) can be compressed or stretched according to the distance between the first cam member (270) and the second cam member (280) without rotating when the arm shaft (241, 242) rotates. For example, the first elastic member (291) can be compressed when the first cam member (270) moves in the second axial direction (②) and the second cam member (280) moves in the first axial direction (①).

[0083] FIG. 6 is a drawing illustrating the rotational movement of a rotating structure of a hinge structure according to one embodiment. FIG. 6 is a cross-sectional view AA' of FIG. 3.

[0084] FIG. 6(a) is a drawing showing a hinge structure (200) in an unfolded state. FIG. 6(b) is a drawing showing a hinge structure (200) in a folded state. FIG. 6(c) is a drawing showing a hinge structure (200) in a fully folded state.

[0085] In one embodiment, a first guide rail (233) and a second guide rail (234) may be formed in the fixed structure (230). In one embodiment, the first guide rail (233) may be formed substantially in the shape of an arc. For example, the center of the arc of the first guide rail (233) may be the first rotation axis (R1). That is, the first guide rail (233) may guide the first rotation structure (210) to rotate along a rotation path centered on the first rotation axis (R1). In one embodiment, the second guide rail (234) may be formed substantially in the shape of an arc. For example, the center of the arc of the second guide rail (234) may be the second rotation axis (R2). That is, the second guide rail (234) may guide the second rotation structure (220) to rotate along a rotation path centered on the second rotation axis (R2).

[0086] In one embodiment, the first rotating structure (210) may include a first connecting portion (212) and a first guide portion (211). The first guide portion (211) may be substantially cylindrical in shape. For example, the cross-section of the first guide portion (211) may be substantially arc-shaped. In one embodiment, the first rotating structure (210) may rotate about a first rotation axis (R1) with the first protruding portion (213) of the first guide portion (211) being received in the first guide rail (233) of the fixed structure (230). For example, when the first connecting portion (212) is folded or unfolded together with the first housing (110), the first rotating structure (210) may rotate along an arc-shaped rotation path centered on the first rotation axis (R1).

[0087] In one embodiment, the second rotating structure (220) may include a second connecting portion (222) and a second guide portion (221). The second guide portion (221) may be substantially cylindrical in shape. For example, the cross-section of the second guide portion (221) may be substantially arc-shaped. In one embodiment, the second rotating structure (220) may rotate about a second rotation axis (R2) with the second protrusion portion (223) received in the second guide rail (234). For example, when the second connecting portion (222) is folded or unfolded together with the second housing (120), the second rotating structure (220) may rotate along an arc-shaped rotation path centered on the second rotation axis (R2).

[0088] In one embodiment, the first rotation axis (R1) and the second rotation axis (R2) may each be parallel to the axial direction of the hinge structure (200). In one embodiment, the first rotation axis (R1) and the second rotation axis (R2) may be formed at a position spaced apart in the z-axis direction relative to the first connecting part (212) of the first rotation structure (210) and the second connecting part (222) of the second rotation structure (220).

[0089] Referring to FIG. 6(a), the first connecting part (212) can limit the direction in which the first rotating structure (210) can rotate to one when unfolded. For example, the first end of the first guide rail (233) can be open, and the other second end can be covered by the first connecting part (212). Thus, when unfolded, the first rotating structure (210) can rotate clockwise around the first rotation axis (R1) relative to the drawing and cannot rotate counterclockwise.

[0090] Referring to FIG. 6(a), the second connecting part (222) can limit the direction in which the second rotating structure (220) can rotate to one when unfolded. For example, the third end of the second guide rail (234) can be open, and the other fourth end can be covered by the second connecting part (222). Thus, when unfolded, the second rotating structure (220) can rotate counterclockwise around the second rotation axis (R2) relative to the drawing and cannot rotate clockwise.

[0092] FIG. 7 is a drawing illustrating the rotational and sliding movements of the arm of a hinge structure and a rotating structure according to one embodiment.

[0093] FIG. 7(a) is a drawing showing a hinge structure (200) in an unfolded state. FIG. 7(b) is a drawing showing a hinge structure (200) in a folded state. FIG. 7(c) is a drawing showing a hinge structure (200) in a fully folded state.

[0094] Referring to FIG. 7, when the hinge structure (200) is folded or unfolded, the rotating structure (210, 220) and the arm (250, 260) can rotate around different axes. For example, the rotating structure (210, 220) and the arm (250, 260) can rotate along different rotation paths. Due to the difference in the rotation paths of the rotating structure (210, 220) and the arm (250, 260), the arm (250, 260) can slide when the hinge structure (200) is folded or unfolded.

[0095] In one embodiment, the first rotating structure (210) may rotate in a first rotational direction around a first rotational axis (R1). For example, in a folding operation, the first rotating structure (210) may rotate clockwise. For example, based on the unfolded state, the point where the first sliding pin (256) is located on the first rotating structure (210) may be defined as the first point (A1). In folding and unfolding operations, the first point (A1) of the first rotating structure (210) may move along a first rotational path (P1).

[0096] Referring to FIG. 7, the first arm (250) and the first sliding pin (256) can rotate around the first arm axis (241). For example, in a folding operation, the first arm (250) and the first sliding pin (256) can rotate clockwise. For example, in an unfolded state, the first sliding pin (256) is located at a first point (A1), and in a folded state, the first sliding pin (256) can be located at a position spaced apart from the first point (A1) in a direction perpendicular to the axial direction. The first sliding pin (256) can move along a second rotation path (P2) in folding and unfolding operations.

[0097] In various embodiments, the first rotation path (P1) and the second rotation path (P2) may be different. For example, the first rotation axis (R1) and the first arm axis (241) may be parallel but not coincide, and the rotation radius of the first rotation structure (210) and the first arm (250) may not coincide.

[0098] Accordingly, in folding and unfolding movements, the first arm (250) and the first sliding pin (256) can slide relative to the first rotating structure (210). The sliding movement of the first sliding pin (256) and the first arm (250) can be guided by the first sliding pin (256) being received in the first sliding groove (215) of the first rotating structure (210). In one embodiment, when a folding movement is performed from an unfolded state, the distance between the first sliding pin (256) and the first point (A1) may increase. When an unfolding movement is performed from a fully folded state, the distance between the first sliding pin (256) and the first point (A1) may decrease.

[0099] In one embodiment, the second rotating structure (220) may rotate in a second rotational direction around a second rotational axis (R2). For example, in a folding operation, the second rotating structure (220) may rotate counterclockwise. For example, based on the unfolded state, the point where the second sliding pin (266) is located on the second rotating structure (220) may be defined as the second point (A2). In folding and unfolding operations, the second point (A2) may move along a third rotational path (P3).

[0100] In one embodiment, the second arm (260) and the second sliding pin (266) may rotate around the second arm axis (242). For example, in a folding operation, the second arm (260) and the second sliding pin (266) may rotate counterclockwise. For example, in an unfolded state, the second sliding pin (266) may be located at a second point, and in a folded state, the second sliding pin (266) may be located at a position spaced apart from the second point (A2) in a direction perpendicular to the axial direction. The second sliding pin (266) may move along a fourth rotation path (P4) in folding and unfolding operations.

[0101] In various embodiments, the third rotation path (P3) and the fourth rotation path (P4) may be different. For example, the second rotation axis (R2) and the second arm axis (242) may be parallel but not coincide, and the rotation radius of the second rotation structure (220) and the second arm (260) may not coincide.

[0102] Accordingly, in folding and unfolding movements, the second arm (260) and the second sliding pin (266) can slide relative to the second rotating structure (220). The sliding movement of the second sliding pin (266) and the second arm (260) can be guided by the second sliding pin (266) being received in the second sliding groove (225) of the second rotating structure (220). In one embodiment, when a folding movement is performed from an unfolded state, the distance between the second sliding pin (266) and the second point (A2) may increase. When an unfolding movement is performed from a fully folded state, the distance between the second sliding pin (266) and the second point (A2) may decrease.

[0104] FIG. 8 is a drawing illustrating the cam profile of a hinge structure according to one embodiment.

[0105] Although only the cam shapes of the first cam structures (first arm cam (254), second arm cam (255), first moving cam (271), and third moving cam (281)) coupled to the first arm shaft (241) are shown in FIG. 8, they can be applied in the same way to the second cam structures coupled to the second arm shaft (e.g., the third arm cam (264), fourth arm cam (265), second moving cam (272), and fourth moving cam (282) of FIG. 5). The first arm cam (254), second arm cam (255), first moving cam (271), third moving cam (281), and their coupling relationships described below can be applied in the same way to the third arm cam (264), fourth arm cam (265), second moving cam (272), fourth moving cam (282), and their coupling relationships, respectively.

[0106] The illustrated cam profile is formed by unfolding the first cam structures (first arm cam (254), second arm cam (255), first moving cam (271), and third moving cam (281)) of the hinge structure (200) in a fully folded state around the first arm axis (241). The horizontal axis of the cam profile is formed by unfolding the first cam structures from a reference point of 0 degrees to 360 degrees. For example, the reference point is in a fully folded state, and as the hinge structure (200) unfolds, the first arm cam (254) and the second arm cam (255) move to the right (e.g., rotation in the unfolding direction) in the illustrated profile, and the first moving cam (271) and the third moving cam (281) can move in the axial direction. The first arm cam (254) and the second arm cam (255) can each move by an angle of 120 degrees or less.

[0107] In various embodiments, the first female cam (254) and the second female cam (255) each rotate together with the first female shaft (241), and for example, the rotation angle of the first female shaft (241) may be half the angle of contact (A) of the electronic device (100) and the hinge structure (200) shown in FIG. 9. In various embodiments, the third female cam (264) and the fourth female cam (265) each rotate together with the second female shaft (242), and for example, the rotation angle of the second female shaft (242) may be half the angle of contact (A) of the electronic device (100).

[0108] The horizontal axis of the cam profile may represent the direction in which the first arm cam (254) and the second arm cam (255) rotate (e.g., the unfolding direction) when the hinge structure (200) is unfolded from a reference point in a fully folded state. For example, the first arm cam (254) and the second arm cam (255) may move in the direction of the illustrated arrow. The vertical axis of the cam profile may represent the axial direction of the hinge structure (200).

[0109] In one embodiment, the cam structures may be formed to repeat with the same shape and spacing according to each displacement of the first arm axis (241). Each displacement at which such repetition occurs may be defined as a period (T). In one embodiment, the cam structures may be configured to have one or more periods (T). For example, the cam structures may be formed to have three periods (T) including an angular displacement of 120 degrees. In various embodiments, the cam structures are not necessarily limited to having three periods (T). For example, the cam structures may have one, two, four, or more periods.

[0110] Referring to FIG. 8, the first arm cam (254) may include a first protrusion (254a) and a first depression (254b). The first protrusion (254a) may include a portion protruding in the second axial direction (②) from the flat depression surface of the first depression (254b). The first protrusion (254a) may protrude to a first height (h1) in the second axial direction (②). The first protrusion (254a) includes a flat protruding surface, said protruding surface may extend from a first angle (θ1) to a second angle (θ2) and be formed with a first angular displacement (θ2-θ1). The first protrusion (254a) may engage with the third protrusion (271a) of the first moving cam (271).

[0111] In the first arm cam (254), when viewed in the unfolding direction (e.g., the right direction with respect to FIG. 8, the direction indicated by the arrow), a first recess (254b) and a first protrusion (254a) may be formed sequentially to form a cycle (T). For example, a first recess (254b) may be formed again in the unfolding direction of the first protrusion (254a).

[0112] Referring to FIG. 8, the first moving cam (271) may include a third protrusion (271a) and a third depression (271b). The third protrusion (271a) may include a portion protruding in the first axial direction (①) from the flat depression surface of the third depression (271b). The third protrusion (271a) may protrude to a third height (h3) in the first axial direction (①). The third protrusion (271a) includes a flat protruding surface, said protruding surface may extend from a fifth angle (θ5) to a sixth angle (θ6) and be formed with a third angular displacement (θ6-θ5). The third protrusion (271a) may engage with the first protrusion (254a) of the first arm cam (254). The first moving cam (271) may include a first inclined surface (271c) and a second inclined surface (271d). The first inclined surface (271c) may be inclined downward (e.g., in the second axial direction (②)) from the third protrusion (271a) toward the third depression (271b) when viewed in the unfolding direction. The second inclined surface (271d) may be inclined upward (e.g., in the first axial direction (①)) from the third depression (271b) toward the third protrusion (271a) when viewed in the unfolding direction. For example, the protrusion may be formed between the first inclined surface (271c) and the second inclined surface (271d).

[0113] In the first moving cam (271), when viewed in the unfolding direction, a first inclined surface (271c), a first recess (271b), a second inclined surface (271d), and a second protrusion (271a) are sequentially formed, and a cycle (T) can be formed. For example, the first inclined surface (271c) can be formed again in the unfolding direction of the second protrusion (271a).

[0114] Referring to FIG. 8, the second arm cam (255) may include a second protrusion (255a) and a second recess (255b). The second protrusion (255a) may include a portion protruding in the first axial direction (①) from the second recess (255b). The second protrusion (255a) may protrude to a second height (h2) in the first axial direction (①). The second protrusion (255a) includes a flat protruding surface, said protruding surface may extend from a third angle (θ3) to a fourth angle (θ4) and be formed with a second angular displacement (θ4-θ3). The second protrusion (255a) may engage with the fourth protrusion (281a) and the fifth protrusion (281c) of the third moving cam (281).

[0115] In the second arm cam (255), when viewed in the unfolding direction (e.g., the right direction with respect to FIG. 8, the direction indicated by the arrow), a second protrusion (255a) and a second depression (255b) may be formed sequentially to form a cycle (T). For example, a second protrusion (255a) may be formed again in the unfolding direction of the second depression (255b).

[0116] Referring to FIG. 8, the third moving cam (281) may include a fourth protrusion (281a), a fifth protrusion (281c), a fourth depression (281d), and a fifth depression (281d). The fourth protrusion (281a) may include a portion protruding in the second axial direction (②) from the fourth depression (281d). The fourth protrusion (281a) may protrude to a fourth height (h4) in the first axial direction (①). The fifth protrusion may include a portion protruding in the first axial direction (①) from the fourth depression (281d). The fifth protrusion (281c) may protrude to a fifth height (h5) in the first axial direction (①). The fifth protrusion (281c) includes a flat protruding surface, said protruding surface extending from the seventh angle (θ7) to the eighth angle (θ8) and may be formed with a fourth angular displacement (θ8-θ7). The fourth protrusion (281a) and the fifth protrusion (281c) may engage with the second protrusion (255a) of the second arm cam (255). The third moving cam (281) may include a third inclined surface (281e), a fourth inclined surface (281f), a fifth inclined surface (281g), and a sixth inclined surface (281h). The third inclined surface (281e) may be inclined upward (e.g., in the second axial direction (②)) from the fourth recess (281b) to the fourth protrusion (281a) when viewed in the unfolding direction. The fourth inclined surface (281f) may be inclined downward (e.g., in the first axis direction (①)) from the fourth protrusion (281a) to the fifth depression (281d) when viewed in the unfolding direction. The fifth inclined surface (281g) may be inclined upward (e.g., in the second axis direction) from the fifth depression (281d) to the fifth protrusion (281c) when viewed in the unfolding direction. The sixth inclined surface (281h) may be inclined downward (e.g., in the first axis direction) from the fifth protrusion (281c) to the fourth depression (281d) when viewed in the unfolding direction. For example, the protruding surface of the fourth protrusion (281a) may be formed between the third inclined surface (281e) and the fourth inclined surface (281f).For example, the protruding surface of the fifth protrusion (281c) can be formed between the fifth inclined surface (281g) and the sixth inclined surface (281h).

[0117] In the third moving cam (281), when viewed in the unfolding direction, a fourth depression (281b), a third inclined surface (281e), a fourth protrusion (281a), a fourth inclined surface (281f), a fifth depression (281c), a fifth inclined surface (281g), a fifth protrusion (281d), and a sixth inclined surface (281h) are sequentially formed, and a cycle (T) can be formed. For example, the fourth depression (281b) may again be formed in the unfolding direction of the sixth inclined surface (281h).

[0118] In various embodiments, the protruding surface of the first protrusion (254a) may have a smaller angular displacement than the recessed surface of the third recess (271b). For example, the protruding surface of the first protrusion (254a) may have a smaller area than the recessed surface of the third protrusion (271b). For example, the protruding surface of the first protrusion (254a) may be formed with a first length along the circumferential direction when the first female cam (254) is viewed in a cylindrical coordinate system centered on the first female axis (241), and the recessed surface of the third protrusion (271b) may be formed with a second length greater than the first length along the circumferential direction when the first moving cam (271) is viewed in a cylindrical coordinate system centered on the first female axis (241).

[0119] In various embodiments, the protruding surface of the second protrusion (255a) may have a smaller angular displacement than the protruding surface of the fifth protrusion (281c). For example, the second angular displacement (θ4-θ3) may be smaller than the fourth angular displacement (θ8-θ7). For example, the protruding surface of the second protrusion (255a) may have a smaller area than the protruding surface of the fifth protrusion (281c). For example, the protruding surface of the second protrusion (255a) may be formed with a third length along the circumferential direction when the second arm cam (255) is viewed in a cylindrical coordinate system centered on the first arm axis (241), and the protruding surface of the fifth protrusion (281c) may be formed with a fourth length greater than the third length along the circumferential direction when the third moving cam (281) is viewed in a cylindrical coordinate system centered on the first arm axis.

[0120] In various embodiments, the hinge structure (200) may be configured such that the angular displacement (θ5-θ2=Δ1) between the fifth angle (θ5) and the second angle (θ2) is substantially the same as the angular displacement (θ7-θ4=Δ1) between the seventh angle (θ7) and the fourth angle (θ4). For example, when the hinge structure (200) is unfolded from the illustrated fully folded state, the first arm cam (254) and the second arm cam (255) may each rotate by the same angle in the unfolding direction. For example, the first arm cam (254) and the second arm cam (255) may each move by the same distance to the right when viewed in the cam profile. For example, the hinge structure (200) may be configured such that when the second edge of the protruding surface of the first arm cam (254) (e.g., a point at the second angle (θ2)) moves along the second inclined surface (271d) to reach the fifth edge of the third protruding part (271a) of the first moving cam (271) (e.g., a point at the fifth angle (θ5)), the fourth edge of the protruding surface of the second arm cam (255) (e.g., a point at the fourth angle (θ4)) simultaneously reaches the seventh edge of the protruding surface of the fifth protruding part (281c) of the third moving cam (281) along the third inclined surface (281e), the fourth inclined surface (281f), and the fifth inclined surface (281g). That is, when the first arm cam (254) and the second arm cam (255) rotate by Δ1, the first protrusion (254a) and the second protrusion (255a) can each be configured to substantially simultaneously enter the third protrusion (271a) of the first moving cam (271) and the fifth protrusion (281c) of the third moving cam (281).

[0121] Likewise, the hinge structure (200) can be configured such that the angular displacement (θ6-θ1=Δ2) between the sixth angle (θ6) and the first angle (θ1) is substantially the same as the angular displacement (θ8-θ3=Δ2) between the eighth angle (θ8) and the third angle (θ3). For example, the hinge structure (200) may be configured such that when the first edge of the protruding surface of the first arm cam (254) (e.g., a point at the first angle (θ1)) moves along the second inclined surface (271d) to reach the sixth edge of the third protruding part (271a) of the first moving cam (271) (e.g., a point at the sixth angle (θ6)), the third edge of the protruding surface of the second arm cam (255) (e.g., a point at the third angle (θ3)) simultaneously reaches the eighth edge of the protruding surface of the fifth protruding part (281c) of the third moving cam (281) along the third inclined surface (281e), the fourth inclined surface (281f), and the fifth inclined surface (281g) (e.g., a point at the eighth angle (θ8)). That is, when the first arm cam (254) and the second arm cam (255) rotate by Δ2, the first protrusion (254a) and the second protrusion (255a) can each be configured to simultaneously detach from the third protrusion (271a) of the first moving cam (271) and the fifth protrusion (281c) of the third moving cam (281).

[0122] In one embodiment, the cam structures may be formed such that the first protrusion (254a) of the first arm cam (254) is received in the first recess (271b) of the first moving cam (271) while the second protrusion (255a) of the second arm cam (255) engages with the fourth protrusion (281a) of the third moving cam (281). In other words, the first recess (271b) of the first moving cam (271) may be formed to be longer in the circumferential direction than the fourth protrusion (281a) of the third moving cam (281). The first recess (271b) of the first moving cam (271) may be extended at a larger angle (θ) than the fourth protrusion (281a) of the third moving cam (281).

[0123] The connection relationship of the cam structures described above may be intended to provide a free-stop section of FIG. 9 described later. For example, the first arm cam (254) and the second arm cam (255) may be configured so that the first protrusion (254a) and the second protrusion (255a), respectively, simultaneously enter and exit the third protrusion (271a) and the fifth protrusion (281c).

[0124] However, the cam profile shown in FIG. 8 is an example for implementing the operation of the hinge structure (200) and the electronic device (100) shown in FIG. 9, and the shape, spacing, and coupling relationship of the cam structures included in the electronic device (100) and the hinge structure (200) according to one embodiment are not limited to the cam profile shown in FIG. 8.

[0126] FIG. 9 is a drawing illustrating the compression of an elastic member of a hinge structure with respect to the pinch angle of an electronic device according to one embodiment.

[0127] The horizontal axis of the illustrated graph may represent the indentation angle (A). The indentation angles (A1, A2, A31, A32) mentioned in FIG. 9 may be substantially equal to twice the angle (θ) illustrated in the profiles of the cam structures in FIG. 8.

[0128] In one embodiment, the hinge structure (200) and / or electronic device (100) may include various states defined by the interlocking angle (A) formed by the first rotational structure (210) and the second rotational structure (220) in a folding or unfolding operation. In various embodiments, the interlocking angle (A) may be the angle formed by the first extension portion (253) of the first arm portion (250) and the second extension portion (263) of the second arm portion (260). Referring together to FIGS. 2a through 2c, the interlocking angle (A) may include the angle formed by the normal vector (n1) of the first region (141) of the display (140) and the normal vector (n2) of the second region (142), the angle formed by the third edge (P3) and the fourth edge (P4), or the angle formed by the first housing (110) and the second housing (120).

[0129] The vertical axis of the illustrated graph may represent the displacement of the cam members (270, 280). For example, moving in the + direction may mean that the distance between the first cam member (270) and the second cam member (280) decreases. Alternatively, the vertical axis of the illustrated graph may represent the displacement of the elastic members (291, 292). For example, moving in the + direction may mean that the elastic members (291, 292) are more compressed.

[0130] That is, as the cam displacement increases, the elastic member (291, 292) is compressed more, which may mean that the frictional force between the cam structures increases. Due to the increased frictional force, an increased frictional torque may be applied to the arm shaft (241, 242). An increase in frictional torque may mean that the rotational torque required for the hinge structure (200) to operate increases.

[0131] In one embodiment, the hinge structure (200) and / or electronic device (100) may include a first state (S1) in which the angle of insertion defined between the fully folded state (Sf) and the unfolded state (Su) is a first angle of insertion (A1), a second state (S2) in which the angle of insertion is a second angle of insertion (A2), a third state (S3) in which the angle of insertion is a third angle of insertion (A3), and a fourth state (S4) in which the angle of insertion is a fourth angle of insertion (A4). The first angle of insertion (A1), the second angle of insertion (A2), and the third angle of insertion (A3) may be angles that are progressively larger. In other words, the hinge structure (200) and / or electronic device (100) may move sequentially from the fully folded state (Sf) through the first state (S1), the second state (S2), and the third state (S3) to the unfolded state (Su).

[0132] In one embodiment, the electronic device (100) and the hinge structure (200) may include a folding detent section, an automatic unfolding section, a free stop section, and an unfolding detent section. The folding detent section may include a section between a fully folded state and a first state (S1). The automatic unfolding section may include a section between a first state (S1) and a second state (S2). The free stop section may include a section between a third-1 state (S3-1) and a third-2 state (S3-2). The unfolding detent section may include a section between a third-2 state (S3-2) and an unfolded state (Su).

[0133] In the folding detent section, the cam displacement may increase as the angle of insertion (A) increases. For example, in the folding detent section, the elastic members (291, 292) may be configured to be more compressed as the first arm shaft (241) and the second arm shaft (242) rotate. That is, the folding detent section may have a positive slope. Accordingly, the electronic device (100) and the hinge structure (200) may require a relatively large force to compress the elastic members (291, 292) by a first displacement (ΔL1) to reach a first state (S1) from a fully folded state. For example, the required force may be proportional to the first displacement (ΔL1). For example, when a force smaller than the required force is applied to the electronic device (100) and the hinge structure (200), the electronic device (100) and the hinge structure (200) can be moved back to a fully folded state (Sf) by the elastic force of the compressed elastic member (291, 292). Thus, the electronic device (100) and the hinge structure (200) can maintain a fully folded state (Sf) when not in an intended unfolding motion by the user.

[0134] In the automatic unfolding section, the cam displacement may decrease as the interlocking angle (A) increases. The reduced cam displacement may be greater than the increased cam displacement in the folding detent section. For example, in the automatic unfolding section, the elastic members (291, 292) may be configured to be tensioned as the first arm shaft (241) and the second arm shaft (242) rotate. That is, the automatic unfolding section may have a first negative slope (g1). For example, in the automatic unfolding section, the elastic members (291, 292) may be tensioned by a second displacement (ΔL2) which is greater than the first displacement (ΔL1). When viewed as unfolding sections, the automatic unfolding section and the unfolding detent section have negative slopes, and the magnitude of the first negative slope (g1) of the automatic unfolding section may be greater than the magnitude of the second negative slope (g2) of the unfolding detent section. In one embodiment, when the electronic device (100) and the hinge structure (200) have once departed from the first state (S1), they can move to the second state (S2) by the elastic force of the elastic member (291, 292) even without the application of an external force (e.g., a user’s unfolding motion).

[0135] In one embodiment, the electronic device (100) and the hinge structure (200) may be configured to automatically unfold to a second pinch angle (A2) when a trigger is activated that allows the device to unfold from a fully folded state and deviate from a first state (S1). For example, the trigger may include an action in which a user inserts a finger between the first housing (110) and the second housing (120) to increase the pinch angle beyond the first pinch angle (A1).

[0136] In various embodiments, the electronic device (100) and the hinge structure (200) may include a semi-automatic unfolding section including a folding detent section and an automatic unfolding section. The electronic device (100) and the hinge structure (200) may include a semi-automatic unfolding section (e.g., a folding detent section and an automatic unfolding section) that automatically unfolds to a second interlocking angle (A2) when a trigger is applied that forms a first interlocking angle (A1) or larger in a fully folded state. In various embodiments, the first angular displacement (ΔA1) for reaching the first state (S1) may be smaller than the second angular displacement (A2-A1) for reaching the second state (S2) from the first state (S1). That is, by a trigger that unfolds to a relatively small angle, it may automatically unfold to a relatively large angle. For example, the first interlocking angle (A1) may be 15 degrees and the second interlocking angle (A2) may be 40 degrees. However, the first interlocking angle (A1) and the second interlocking angle (A2) of the hinge structure (200) and the electronic device (100) according to one embodiment are not limited to the above values ​​and may include various numerical ranges.

[0137] In various embodiments, the folding detent section and the automatic unfolding section may be provided by the second cam member (280). For example, the second cam member (280) may include a third moving cam (281) and a fourth moving cam (282). The second cam member (280) may form a cam displacement as it moves axially by engaging with a rotating second arm cam (255) and a fourth arm cam (265). In various embodiments, in the folding detent section and the automatic unfolding section, the first cam member (270) may not move axially. For example, the first cam member (270) may include a first moving cam (271) and a second moving cam (272). The first cam member (270) may be engaged with the rotating first arm cam (254) and third arm cam (264) in the folding detent section and the automatic unfolding section, but may not move in the axial direction. For example, as shown in FIG. 8, the first protrusion (254a) of the first arm cam (254) may be received in the third recess (271b) of the first moving cam (271).

[0138] The free-stop section may have a substantially uniform cam displacement regardless of changes in the angle of engagement. For example, in the free-stop section, the elastic members (291, 292) may maintain a constant degree of compression even as the first arm shaft (241) and the second arm shaft (242) rotate. In various embodiments, the cam displacement in the free-stop section may be substantially the same as or greater than the cam displacement in the first state (S1). For example, the elastic members (291, 292) may be compressed to a length substantially the same as in the first state (S1) or further compressed.

[0139] In this way, the elastic members (291, 292) compressed in the free-stop section can increase the frictional force between the cam structures. Due to the increased frictional force, an increased rotational torque may be required to operate the electronic device (100) and the hinge structure (200). Thus, the hinge structure (200) and the electronic device (100) can stably maintain a folded state at various angles in the free-stop section.

[0140] In one embodiment, the free-stop section and the folding detent section can prevent unintended unfolding of the hinge structure (200) and the electronic device (100) due to the restoring force of the display (140). For example, at least some area of ​​the display (140) may be formed as a curved surface in the folded state. A restoring force attempting to return to the unfolded state may act on the display (140) in the folded state. The restoring force may increase as the display (140) becomes thicker and larger. Due to the restoring force, the electronic device (100) and the hinge structure (200) may perform unintended unfolding. For example, the electronic device (100) may unfold without maintaining a predetermined angle set by the user, or unfold without maintaining a completely folded state.

[0141] In various embodiments, the free stop section may include a section from the third-1 interlocking angle (A31) to the third-2 interlocking angle (A32). For example, the third-1 interlocking angle (A31) may be 60 degrees and the third-2 interlocking angle (A32) may be 160 degrees. For example, the free stop section may be provided in a section of 100 degrees. However, the third-1 interlocking angle (A31) and the third-2 interlocking angle (A32) of the hinge structure (200) and the electronic device (100) according to one embodiment are not limited to the above numerical values ​​and may include various numerical ranges.

[0142] A hinge structure (200) according to one embodiment may include elastic members (291, 292) to provide a predetermined frictional torque in a predetermined folded state (e.g., a free stop section, a fully folded state (Sf)), and cam structures configured to compress the elastic members (291, 292) in the predetermined folded state. The predetermined frictional torque may offset the restoring torque in the unfolding direction of the display (140). For example, the hinge structure (200) may be configured such that, in the fold detent section, the cam displacement increases as it unfolds, and the rotational torque required to reach a first state (S1) from the fully folded state (Sf) is greater than or equal to the restoring torque of the display (140). Accordingly, the electronic device (100) and the hinge structure (200) can offset the restoring torque of the display (140) and maintain a fully folded state (Sf) when no separate external force is applied in the fold detent section.

[0143] In one embodiment, the cam displacement in the unfolding detent section may decrease as the interlocking angle (A) increases. For example, in the unfolding detent section, the elastic members (291, 292) may be configured to be more tensioned as the first arm shaft (241) and the second arm shaft (242) rotate. For example, the elastic members (291, 292) may be tensioned by a third displacement (ΔL3). That is, the unfolding detent section may have a second negative slope (g2). The magnitude of the second negative slope (g2) may be smaller than the magnitude of the first negative slope (g1) of the automatic unfolding section. That is, the slope of the unfolding detent section may be gentler compared to the slope of the automatic unfolding section. In one embodiment, the electronic device (100) and the hinge structure (200) can move to an unfolded state by the elastic force of the elastic members (291, 292) even when no external force (e.g., user's unfolding motion) is applied in the unfolding detent section. In various embodiments, the third displacement (ΔL3) may be substantially the same as the first displacement (ΔL1).

[0144] According to one embodiment, an electronic device (100) and a hinge structure (200) may require an increased rotational torque capable of further compressing the elastic members (291, 292) by a third displacement (ΔL3) to reach a free stop section (e.g., a third-2 state (S3-2)) from an unfolded state. For example, the increased rotational torque may be proportional to the third displacement (ΔL3). For example, if a torque smaller than the required rotational torque is applied to the electronic device (100) and the hinge structure (200), the electronic device (100) and the hinge structure (200) may move back to an unfolded state (Su) by the elastic force of the compressed elastic members (291, 292). Thus, the electronic device (100) and the hinge structure (200) may maintain an unfolded state (Su) when not in a folding motion intended by the user.

[0145] In one embodiment, when the electronic device (100) and the hinge structure (200) are folded from the free stop section (e.g., the third-1 state (S3-1)), they can move to the second state (S2) by the elastic force of the elastic member (291, 292) without any separate external force. In this way, when the electronic device (100) and the hinge structure (200) have exited the free stop section, they can move to the unfolded state (Su) or the second state (S2) by the elastic member (291, 292) without any external force being applied.

[0147] FIG. 10 is a drawing illustrating a hinge structure in a fully folded state and a first state according to one embodiment. FIG. 11 is a drawing illustrating a hinge structure in a second state according to one embodiment. FIG. 12 is a drawing illustrating a hinge structure of a free-stop section according to one embodiment. FIG. 13 is a drawing illustrating a hinge structure in an unfolded state according to one embodiment.

[0148] Although only the first cam structures associated with the first arm axis are illustrated in FIGS. 10 to 13, the description of the shape, structure, coupling relationship, and operation for each of the first cam structures can be equally applied to the second cam structures.

[0149] Referring to FIGS. 10 to 13, the first moving cam (271) has a first inclined surface (271c), a first recess (271b), a second inclined surface (271d), and a second protrusion (271a) formed sequentially when viewed in the unfolding direction, and can form a cycle (e.g., cycle (T) of FIG. 8). For example, the first inclined surface (271c) can be formed again in the unfolding direction of the second protrusion (271a).

[0150] Referring to FIGS. 10 to 13, the third moving cam (281) may sequentially form a fourth recess (281b), a third inclined surface (281e), a fourth protrusion (281a), a fourth inclined surface (281f), a fifth recess (281c), a fifth inclined surface (281g), a fifth protrusion (281d), and a sixth inclined surface (281h) when viewed in the unfolding direction, thereby forming a cycle (e.g., cycle (T) of FIG. 8). For example, the fourth recess (281b) may again be formed in the unfolding direction of the sixth inclined surface (281h).

[0151] Hereinafter, with reference to FIG. 10, a hinge structure (200) in a fully folded state (Sf) and a first state (S1), and an operation to move from the fully folded state (Sf) to the first state (S1) will be described.

[0152] In the fully folded state, at least a portion of the first protrusion (254a) of the first arm cam (254) may be located inside the third recess (271b) of the first moving cam (271). The first protrusion (254a) may include a flat first protruding surface. The third recess (271b) may include a flat third recess. The first protruding surface of the first protrusion (254a) may contact the third recess surface of the third recess (271b). The inclined surface of the first protrusion (254a) may contact the first inclined surface (271c) of the third recess (271b).

[0153] In the fully folded state, at least a portion of the second protrusion (255a) of the second arm cam (255) may be located inside the fourth recess (281d) of the third moving cam (281). The second protrusion (255a) may be supported by the third inclined surface (281e). The end of the second protrusion (255a) may be positioned spaced apart from the fourth recess surface of the fourth recess (281d). Referring to FIG. 2c, in the fully folded state, the first housing (110) and the second housing (120) of the electronic device (100) can no longer perform a folding operation by the first edge (P1) and the second edge (P2) coming into contact. Thus, the second protrusion (255a) of the second arm cam (255) is supported by the third inclined surface (281e) of the third moving cam (281) and cannot move toward the third recessed surface.

[0154] In the fully folded state, the first elastic member (291) can be compressed to a first length (L1). The first elastic member (291) may be in a tensioned state or a less compressed state compared to the first state (S1).

[0155] In the first state (S1), the first protrusion (254a) of the first arm cam (254) may be located, at least partially, inside the third recess (271b) of the first moving cam (271). The first protruding surface of the first protrusion (254a) may come into contact with the third recess (271b) of the third recess. For example, in the first state (S1), the first protrusion (254a) may be in a state where it has moved a predetermined distance in the unfolding direction compared to the fully folded state (Sf). The inclined surface of the first protrusion (254a) may be spaced apart from the first inclined surface (271c) of the third recess (271b).

[0156] In the first state (S1), the second protrusion (255a) of the second arm cam (255) may come into contact with the fourth protrusion (281a) of the third moving cam (281). For example, the end of the second protrusion (255a) and the end of the fourth protrusion (281a) may come into surface contact. Compared to the fully folded state (Sf), the first cam member (270) does not move in the axial direction, and the second cam member (280) may move in the first axial direction (①). Accordingly, the first elastic member (291) may be in a compressed state compared to the fully folded state (Sf). For example, in the first state (S1), the first elastic member (291) has a second length (L1), and the second length (L2) may be smaller than the first length (L1) in the fully folded state (Sf).

[0157] When the hinge structure (200) and / or electronic device (100) moves from a fully folded state (Sf) to a first state (S1), the first protrusion (254a) of the first arm cam (254) can move within the third recess (271b) of the first moving cam (271). For example, the first protrusion (254a) can move in the unfolding direction while the first protruding surface and the third recessed surface are in surface contact. The second protrusion (255a) of the second arm cam (255) can move toward the third protrusion (271a) of the third moving cam (281) along the third inclined surface (281e) of the third moving cam (281). At this time, the second protrusion (255a) presses the third inclined surface (281e) in the first axial direction (①), and the first elastic member (291) can be compressed. That is, the axial length of the first elastic member (291) can be reduced from the first length (L1) to the second length (L2).

[0158] In one embodiment, a force in the second axial direction (②) may be applied to the third moving cam (281) and the second cam member (280) by means of the first elastic member (291). This force increases the frictional force between the second protrusion (255a) and the third inclined surface (281e), thereby increasing the torque required to move from the fully folded state (Sf) to the first state (S1). Therefore, sufficient force may be required to offset the increased torque to move to the first state (S1). If sufficient force is not applied, the hinge structure (200) and / or the electronic device (100) may move back to the fully folded state. In this way, the hinge structure (200) and / or the electronic device (100) may provide a detent function capable of stably maintaining the fully folded state. For example, the hinge structure (200) and / or electronic device (100) may provide the folded detent section shown in FIG. 9.

[0160] FIG. 11 is a drawing illustrating a hinge structure in a second state according to one embodiment.

[0161] Hereinafter, with reference to FIG. 11, a hinge structure (200) of the second state (S2) and an operation to move from the first state (S1) to the second state (S2) will be described.

[0162] In the second state (S2), at least a portion of the first protrusion (254a) of the first arm cam (254) may be located inside the third recess (271b) of the first moving cam (271). The first protruding surface of the first protrusion (254a) may come into contact with the third recess (271b) of the third recess. For example, in the second state (S2), the first protrusion (254a) may have moved a predetermined distance in the unfolding direction compared to the first state (S1). For example, the inclined surface of the first protrusion (254a) may come into contact with the second inclined surface (271d) of the third recess (271b).

[0163] In the second state, the second protrusion (255a) of the second arm cam (255) may be located inside the fifth recess (281d) of the third moving cam (281). The end of the second protrusion (255a) may come into contact with the fifth recess surface of the fifth recess (281d). For example, the second protrusion (255a) may come into contact with the fourth inclined surface (281f) of the third moving cam (281). For example, compared to the first state (S1), the first cam member (270) may not move in the axial direction, and the second cam member (280) may move in the second axial direction (②). Accordingly, the first elastic member (291) may be in a tensioned state compared to the first state (S1). For example, in the second state (S2), the first elastic member (291) has a third length (L3), and the third length (L3) may be larger than the second length (L2) in the first state (S1).

[0164] When the hinge structure (200) and / or electronic device (100) moves from a first state (S1) to a second state (S2), the first protrusion (254a) of the first arm cam (254) can move within the third recess (271b) of the first moving cam (271). For example, the first protrusion (254a) can move in the unfolding direction while the first protruding surface and the third recessed surface are in surface contact. The second protrusion (255a) of the second arm cam (255) can move from the fourth protrusion (281a) of the third moving cam (281) toward the fifth recess (281d) of the third moving cam (281) along the fourth inclined surface (281f) of the third moving cam (281). For example, the inclined surface of the second protrusion (255a) and the fourth inclined surface (281f) of the third moving cam (281) can move while in surface contact. At this time, as the second protrusion (255a) moves in the unfolding direction, the gap between the third moving cam (281) and the second arm cam (255) becomes closer, and the first elastic member (291) can be stretched. That is, the axial length of the first elastic member (291) can be extended from the second length (L2) to the third length (L3). The first elastic member (291) can press the second cam member (280) in the second axial direction (②). For example, the potential energy stored in the first elastic member (291) in the first state (S1) can be converted into kinetic energy that presses the second cam member (280) in the second axial direction (②). The above kinetic energy can move the third moving cam (281) faster and move the second arm cam (255) faster in the unfolding direction.

[0165] A hinge structure (200) and / or electronic device (100) according to one embodiment may be configured to move quickly to a second state (S2) or a fully folded state using potential energy stored in a first elastic member (291) once it is out of a first state (S1). For example, in the first state (S1), the second protrusion (255a) of the second arm cam (255) and the fourth protrusion (281a) of the third moving cam (281) come into contact, and when folded or unfolded from the first state (S1), the second protrusion (255a) may move along a third inclined surface (281e) or a fourth inclined surface (281f).

[0166] In one embodiment, when the second protrusion (255a) is unfolded from the first state (S1) to the second state (S2), it may rotate by a first rotation angle when viewed in the unfolding direction and move by a first distance when viewed in the axial direction. In one embodiment, when the second protrusion (255a) is folded from the first state (S1) to the fully folded state (Sf), it may rotate by a second rotation angle when viewed in the folding direction and move by a second distance when viewed in the axial direction. At this time, the second rotation angle may be smaller than the first rotation angle. The second distance may be smaller than the first distance.

[0167] Referring to FIGS. 10 and 11, an electronic device (100) according to one embodiment can be rapidly unfolded to a second pinch angle (A2) when a trigger is applied in a fully folded state. For example, the trigger may include an action in which a user inserts a finger between a first housing (110) and a second housing (120) in a fully folded state (Sf). By the trigger, a first state (S1) is reached in which the pinch angle between the first housing (110) and the second housing (120) is a first pinch angle (A1), and as the pinch angle increases, the hinge structure (200) can move out of the first state (S1) and move to a second state (S2). At this time, the second protrusion (255a) of the second arm cam (255) can be rapidly moved to the fifth depression (281d) along the fourth inclined surface (281f) by the first elastic member (291).

[0169] FIG. 12 is a drawing illustrating a hinge structure of a freestop section according to one embodiment.

[0170] The third state (S3) may be any state included in the free stop section. For example, the free stop section may include a section greater than or equal to the third-1 interlocking angle (A31) and less than or equal to the third-2 interlocking angle (A32). The third state (S3) may include any state in which the interlocking angle is greater than or equal to the third-1 interlocking angle (A31) and less than or equal to the third-2 interlocking angle (A32).

[0171] In the third state (S3), the first protrusion (254a) of the first arm cam (254) may come into contact with the third protrusion (271a) of the first moving cam (271). For example, the first protruding surface of the first protrusion (254a) may come into surface contact with the third protruding surface of the third protrusion (271a). The second protrusion (255a) of the second arm cam (255) may come into contact with the fifth protrusion (281c) of the third moving cam (281). For example, the second protruding surface of the second protrusion (255a) may come into surface contact with the fifth protruding surface of the fifth protrusion (281c).

[0172] When the hinge structure (200) and / or electronic device (100) moves from the second state (S2) to the third state (S3), the first protrusion (254a) of the first arm cam (254) can move along the second inclined surface (271d) of the first moving cam (271) to the third protrusion (271a) of the first moving cam (271). The second protrusion (255a) of the second arm cam (255) can move along the fifth inclined surface (281g) of the third moving cam (281) to the fifth protrusion (281c) of the third moving cam (281). Accordingly, the first cam member (270) can move in the second axial direction (②), and the second cam member (280) can move in the first axial direction (①). The first elastic member (291) may be in a more compressed state compared to the second state (S2). For example, the first elastic member (291) may be formed with a fourth length (L4), and the fourth length (L4) may be smaller than the third length (L3) in the second state (S2).

[0173] In various embodiments, the first elastic member (291) may be more compressed or compressed equally compared to the first state (S1). In other words, the fourth length (L4) of the first elastic member (291) may be equal to or smaller than the second length (L2) in the first state (S1).

[0174] In various embodiments, the first elastic member (291) may be configured to be compressed to the same length in the free-stop section and the first state (S1). That is, the fourth length (L4) may be substantially the same as the second length (L2). To this end, the protrusion height of the fourth protrusion (281a) may be equal to the sum of the protrusion height of the fifth protrusion (281c) and the protrusion height of the third protrusion (271a).

[0175] In the free stop section, the first protrusion (254a) of the first arm cam (254) can move in the unfolding direction while maintaining contact with the third protrusion (271a) of the first moving cam (271). For example, the first protrusion surface and the third protrusion surface can maintain surface contact. In the free stop section, the first protrusion (254a) of the first arm cam (254) can move along the flat surface of the third protrusion (271a) of the first moving cam (271). In the free stop section, the second protrusion (255a) of the second arm cam (255) can move in the unfolding direction while maintaining contact with the fifth protrusion (281c) of the third moving cam (281). For example, the second protrusion surface and the fifth protrusion surface can maintain surface contact. In the free stop section, the second protrusion (255a) of the second arm cam (255) can move along the flat surface of the fifth protrusion (281c) of the third moving cam (281). Thus, in the free stop section, the first elastic member (291) can be maintained at a constant fourth length (L4) and can be maintained at a more compressed state compared to the second state (S2). At this time, the fourth length (L4) may be smaller than the third length (L3) in the second state (S2).

[0176] Additionally, as the first elastic member (291) maintains a consistently compressed state, the hinge structure (200) can provide a uniform frictional force between the cam structures in the free-stop section. Additionally, a uniform torque may be required for the electronic device (100) to unfold or fold in the free-stop section. That is, the user can apply a predetermined force to the first housing (110) and the second housing (120) to operate the first housing (110) and the second housing (120) so that they have various angles.

[0177] In one embodiment, the 3-1 state (S3-1) may be a state where the interlocking angle is the 3-1 interlocking angle (A31) and the free stop section begins. The 3-2 state (S3-2) may be a state where the interlocking angle is the 3-2 interlocking angle (A32) and the free stop section ends.

[0178] In one embodiment, the third protruding surface of the third protrusion (271a) of the first moving cam (271) may include a first edge (271a-1) connected to the second inclined surface (271d) and a second edge (271a-2) connected to the first inclined surface (271c). For example, the second edge (271a-2) may be located in the unfolding direction from the first edge (271a-1). The fifth protruding surface of the fifth protrusion (281c) of the third moving cam (281) may include a third edge (281c-1) connected to the fifth inclined surface (281g) and a fourth edge (281c-2) connected to the sixth inclined surface (281h). For example, the fourth edge (281c-1) may be located in the unfolding direction from the third edge (281c-2).

[0179] In various embodiments, in the 3-1 state, the first protrusion (254a) of the first female cam (254) may be located at the first edge (271a-1) of the third protrusion (271a) of the first moving cam (271), and the second protrusion (255a) of the second female cam (255) may be located at the third edge (281c-1) of the fifth protrusion (281c) of the third moving cam (281). In the third-2 state, the first protrusion (254a) of the first arm cam (254) may be located at the second edge (271a-2) of the third protrusion (271a) of the first moving cam (271), and the second protrusion (255a) of the second arm cam (255) may be located at the fourth edge (281c-2) of the fifth protrusion (281c) of the third moving cam (281). Thus, the hinge structure (200) may be configured such that, at the start of the free-stop section, the first protrusion (254a) of the first arm cam (254) begins to contact the flat third protrusion surface of the first moving cam (271), and at the same time, the second protrusion (255a) of the second arm cam (255) begins to contact the flat fifth protrusion surface of the third moving cam (281). Additionally, the hinge structure (200) may be configured such that, at the end of the free stop section, the first protrusion (254a) of the first arm cam (254) terminates contact with the flat third protrusion surface of the first moving cam (271), and at the same time, the second protrusion (255a) of the second arm cam (255) terminates contact with the flat fifth protrusion surface of the third moving cam (281).

[0180] In various embodiments, the third protruding surface and the fifth protruding surface may extend in the same angular interval when viewed in a cylindrical coordinate system centered on the first arm axis. Additionally, referring to FIG. 8, when measuring the angle from the fully folded state (Sf), the third protruding surface and the fifth protruding surface may be located at the same angular displacement of the first moving cam (271) and the third moving cam (281), respectively.

[0182] FIG. 13 is a drawing illustrating a hinge structure in an unfolded state according to one embodiment.

[0183] Hereinafter, with reference to FIG. 13, the operation of moving from the hinge structure (200) in the unfolded state (Su) and the free stop section to the unfolded state (Su) will be explained.

[0184] In the unfolded state (Su), at least a portion of the first protrusion (254a) of the first arm cam (254) may be located inside the third recess (271b) of the first moving cam (271). The end of the first protrusion (254a) may be in contact with the first inclined surface (271c) of the first moving cam (271). For example, the inclined surface of the first protrusion (254a) may be in contact with the first inclined surface (271c) of the first moving cam (271). The end of the first protrusion (254a) may be positioned spaced apart from the third recess (271b) of the third recess.

[0185] In the unfolded state (Su), at least a portion of the second protrusion (255a) of the second arm cam (255) may be located inside the fourth recess (281d) of the third moving cam (281). The second protrusion (255a) may be supported by the sixth inclined surface (281h). The end of the second protrusion (255a) may be positioned spaced apart from the fourth recess surface of the fourth recess (281d). In the unfolded state (Su), the first housing (110) and the second housing (120) of the electronic device (100) can no longer perform an unfolding operation. For example, referring together with FIG. 6 (a), the first rotating structure (210) can no longer rotate counterclockwise by the first connecting part (212) of the first rotating structure (210). The second rotating structure (220) can no longer rotate clockwise by means of the second connecting part (222) of the second rotating structure (220). Thus, the second protrusion (255a) of the second arm cam (255) can be supported by the sixth inclined surface (281h) of the third moving cam (281) and maintained spaced apart from the fourth recessed surface of the fourth recessed part (281d).

[0186] When the hinge structure (200) and / or electronic device (100) moves from the free-stop section to the unfolded state, the first protrusion (254a) of the first arm cam (254) can move toward the third recess (271b) along the first inclined surface (271c) of the first moving cam (271). As previously described, the first protrusion (254a) of the first arm cam (254) can move to any point on the first inclined surface (271c) without contacting the third recess of the third recess (271b). The second protrusion (255a) of the second arm cam (255) can move toward the fourth recess (281d) of the third moving cam (281) along the sixth inclined surface (281h) of the third moving cam (281). In one embodiment, as the first protrusion (254a) of the first female cam (254) moves in the unfolding direction, the gap between the first female cam (254) and the first moving cam (271) can be reduced. Similarly, as the second protrusion (255a) of the second female cam (255) moves in the unfolding direction, the gap between the second female cam (255) and the third moving cam (281) can be reduced. Thus, the first elastic member (291) can be stretched. That is, the axial length of the first elastic member (291) can be increased from the fourth length (L4) to the fifth length (L5). In one embodiment, the first elastic member (291) can press the first cam member (270) in the first axial direction (①) and press the second cam member (280) in the second axial direction (②). For example, potential energy stored in the first elastic member (291) in a free-stop state can be converted into kinetic energy that presses the first cam member (270) and the second cam member (280).

[0187] In one embodiment, the hinge structure (200) may provide an unfolding detent function in any state between the free stop section and the unfolded state. For example, in a folding operation to enter the free stop section from the unfolded state, the first arm cam (254) may move along the first inclined surface (271c) to the third protrusion (271a) of the first moving cam (271), and the second arm cam (255) may move along the sixth inclined surface (281h) to the fifth protrusion (281c). At this time, the first cam member (270) and the second cam member (280) move in a direction that brings them closer to each other, and the first elastic member (291) may be compressed from the fifth length (L5) to the fourth length (L4).

[0188] The first elastic member (291) being compressed can press the first moving cam (271) and the third moving cam (281) so that the first cam member (270) and the second cam member (280) move away from each other. For example, the first elastic member (291) can press the first moving cam (271) in the first axial direction (①) and press the third moving cam (281) in the second axial direction (②). By pressing the first elastic member (291), the frictional force between the first arm cam (254) and the first moving cam (271), and the frictional force between the second arm cam (255) and the third moving cam (281) can be increased. Due to the increased frictional force, the torque required to enter the free stop section from the unfolded state can be increased. For example, in order to enter the free stop section from the unfolded state, sufficient force to compress the first elastic member may be required.

[0189] If sufficient force is not applied as described above, the first arm cam (254) may not be able to completely cross the first inclined surface (271c) and may not reach the third protruding surface of the third protrusion (271a). The second arm cam (255) may not be able to completely cross the sixth inclined surface (281h) and may not reach the fifth protruding surface of the fifth protrusion (281c). The first arm cam (254) and the second arm cam (255) may be moved back to an unfolded state by the pressure of the first elastic member (291).

[0190] Accordingly, the hinge structure (200) and / or the electronic device (100) can provide an unfolding detent function that returns to an unfolded state when a relatively small force is applied. For example, the hinge structure (200) and / or the electronic device (100) can provide the unfolding detent section shown in FIG. 9.

[0192] FIG. 14 is a drawing illustrating the friction structure of a hinge structure according to another embodiment.

[0193] In another embodiment, the friction structure (302) may include a first female cam (355) (e.g., the first female cam (254) of FIG. 5), a second female cam (356) (e.g., the second female cam (255) of FIG. 5), a third female cam (365) (e.g., the third female cam (264) of FIG. 5), a fourth female cam (366) (e.g., the fourth female cam (265) of FIG. 5), a first cam member (370) (e.g., the first cam member (270) of FIG. 5), a second cam member (380) (e.g., the second cam member (280) of FIG. 5), a first elastic member (391), a second elastic member (392), a third elastic member (393), and a fourth elastic member (394). In describing the embodiment illustrated in FIG. 14, details that overlap with those described in FIG. 3 to FIG. 13 are omitted.

[0194] Referring to FIG. 14(b), the first arm portion (350) may include a first coupling portion (351) through which the first arm axis (241) passes, a second coupling portion (352) spaced apart from the first coupling portion (351) in the second axial direction (②), a first double-sided cam portion (353) formed between the first coupling portion (351) and the second coupling portion (352) in the axial direction, and a first extension portion (354). The first extension portion (354) may be a portion extending from the first coupling portion (351), the second coupling portion (352), and the first double-sided cam portion (353) in a direction substantially perpendicular to the first arm axis (241). The first extension portion (354) may include a first sliding pin (e.g., the first sliding pin (256) of FIG. 7) that rotates together with the first arm shaft (241) and is engaged with the first rotating structure (e.g., the first rotating structure (210) of FIG. 7). In various embodiments, the first coupling portion (351), the second coupling portion (352), and the first double-sided cam portion (353) may be coupled to the first arm shaft (241) to rotate together with the first arm shaft (241). For example, at least a portion of the first coupling portion (351), the second coupling portion (352), and the first double-sided cam portion (353) may be pressed into the first arm shaft (241).

[0195] Referring to FIG. 14(b), a first female cam (355) and a second female cam (356) may be formed in the first double-sided cam portion (353). The first female cam (355) may be formed on the surface facing the first axial direction (①) of the first double-sided cam portion (353). For example, the first female cam (355) may include a protrusion protruding in the first axial direction (①) (e.g., the first protrusion (254a) of FIG. 8). The first female cam (355) may engage with the first moving cam (371) of the first cam member (370). The second female cam (356) may be formed on the surface facing the second axial direction (②) of the first double-sided cam portion (353). For example, the second arm cam (356) may include a protrusion protruding in the second axial direction (②) (e.g., the second protrusion (255a) of FIG. 8). The second arm cam (356) may engage with the third moving cam (381) of the second cam member (380).

[0196] Referring to FIG. 14(a), the second arm portion (360) may include a third coupling portion (361) through which the second arm axis (242) passes, a fourth coupling portion (362) spaced apart from the third coupling portion (361) in the second axial direction (②), a second double-sided cam portion (363) formed between the third coupling portion (361) and the fourth coupling portion (362) in the axial direction, and a second extension portion (364). The second extension portion (364) may be a portion extending from the third coupling portion (361), the fourth coupling portion (362), and the second double-sided cam portion (363) in a direction substantially perpendicular to the second arm axis (242). The second extension portion (364) may include a second sliding pin (e.g., the second sliding pin (266) of FIG. 7) that rotates together with the second arm shaft (242) and is engaged with the second rotating structure (e.g., the second rotating structure (220) of FIG. 7). In various embodiments, the third coupling portion (361), the fourth coupling portion (362), and the second double-sided cam portion (363) may be coupled to the second arm shaft (242) to rotate together with the second arm shaft (242). For example, at least a portion of the third coupling portion (361), the fourth coupling portion (362), and the second double-sided cam portion (363) may be pressed into the second arm shaft (242).

[0197] Referring to FIG. 14(a), a third female cam (365) and a fourth female cam (366) may be formed in the second double-sided cam portion (363). The third female cam (365) may be formed on the surface of the second double-sided cam portion (363) facing the first axial direction (①). For example, the third female cam (365) may include a protrusion protruding in the first axial direction (①) (e.g., the first protrusion (254a) in FIG. 8). The third female cam (365) may engage with the second moving cam (372) of the first cam member (370). The fourth female cam (366) may be formed on the surface of the second double-sided cam portion (363) facing the second axial direction (②). For example, the fourth arm cam (366) may include a protrusion protruding in the second axial direction (②) (e.g., the second protrusion (255a) of FIG. 8). The fourth arm cam (366) may engage with the fourth moving cam (382) of the second cam member (380).

[0198] In one embodiment, the first cam member (370) may include a first portion (370a) through which the first arm shaft (241) passes, and a second portion (370b) through which the second arm shaft (242) passes. In one embodiment, a first moving cam (371) may be formed in the first portion (370a). The first moving cam (371) may engage with the first arm cam (355). For example, the first moving cam (371) may include a portion protruding in the second axial direction (②). In one embodiment, a second moving cam (372) may be formed in the second portion (370b). The second moving cam (372) may engage with the third arm cam (365). For example, the second moving cam (372) may include a portion protruding in the second axial direction (②). In one embodiment, when the first arm shaft (241) and the second arm shaft (242) rotate, the first part (370a) and the second part (370b) are connected by a first bridge part (e.g., the first bridge part (270c) of FIG. 5), so that the first cam member (370) can move axially without rotating.

[0199] In one embodiment, the second cam member (380) may include a third portion (380a) through which the first arm shaft (241) passes, and a fourth portion (380b) through which the second arm shaft (242) passes. In one embodiment, a third moving cam (381) may be formed in the third portion. The third moving cam (381) may engage with the second arm cam (356). For example, the third moving cam (381) may include a portion protruding in the first axial direction (①). In one embodiment, a fourth moving cam (382) may be formed in the fourth portion (380b). The fourth moving cam (382) may engage with the fourth arm cam (366). For example, the fourth moving cam (382) may include a portion protruding in the first axial direction (①). In one embodiment, when the first arm shaft (241) and the second arm shaft (242) rotate, the third part (380a) and the fourth part (380b) are connected by a second bridge part (e.g., the second bridge part (280c) of FIG. 5), so that the second cam member (380) can move axially without rotating.

[0200] Referring to FIG. 14(b), when viewed in the second axial direction (②), a first elastic member (391), a first moving cam (371) of a first cam member (370), a first arm cam (355), a second arm cam (356), a third moving cam (381) of a second cam member (380), and a second elastic member (392) may be arranged on the first arm shaft (241).

[0201] Referring to FIG. 14(b), the first elastic member (391) may be positioned between the first cam member (370) and the first connecting portion of the first arm. The first elastic member (391) may be compressed or stretched in response to the axial linear movement of the first cam member (370). For example, the compressed first elastic member (391) may increase the frictional force between the first moving cam (371) and the first arm cam (355). The increased frictional force may provide torque to the rotation of the first arm shaft (241).

[0202] Referring to FIG. 14(b), a second elastic member (392) may be positioned between the second cam member (380) and the second connecting portion (352) of the first arm. The second elastic member (392) may be compressed or stretched in response to the axial linear movement of the second cam member (380). For example, a compressed second elastic member (392) may increase the frictional force between the third moving cam (381) and the second arm cam (356). The increased frictional force may provide torque to the rotation of the first arm shaft (241).

[0204] Referring to FIG. 14(a), when viewed in the second axial direction (②), a third elastic member (393), a second moving cam (372) of the first cam member (370), a third arm cam (365), a fourth arm cam (366), a fourth moving cam (382) of the second cam member (380), and a fourth elastic member (394) may be arranged on the second arm shaft (242).

[0205] Referring to FIG. 14(a), a third elastic member (393) may be positioned between the first cam member (370) and the third connecting portion (361) of the second arm (360). The third elastic member (393) may be compressed or stretched in response to the axial linear movement of the first cam member (370). For example, a compressed third elastic member (393) may increase the frictional force between the second moving cam (372) and the third arm cam (365). The increased frictional force may provide torque for the rotation of the second arm shaft (242).

[0206] Referring to FIG. 14(a), the fourth elastic member (394) may be positioned between the second cam member (380) and the fourth connecting portion (362) of the second arm (360). The fourth elastic member (394) may be compressed or stretched in response to the axial linear movement of the second cam member (380). For example, a compressed fourth elastic member (394) may increase the frictional force between the fourth moving cam (382) and the second arm cam (366). The increased frictional force may provide torque to the rotation of the second arm shaft (242).

[0207] The friction structure (302) shown in FIG. 14, compared to the friction structure (202) shown in FIG. 5, includes two additional elastic members (393, 394) to ensure resistance to wear from repeated rotation and ensure operational reliability.

[0209] An electronic device (100) according to embodiments disclosed in this document may include: a housing comprising a first housing (110) having a first edge parallel to the axial direction and a second housing (120) having a second edge parallel to the axial direction; a display (140) extending from the first housing (110) to the second housing (120); and a hinge structure (200) connected to the first housing (110) and the second housing (120).

[0210] The electronic device may include a fully folded state (Sf) in which the first edge (P3) and the second edge (P4) are in at least partial contact, a first state (S1) in which the first edge (P3) and the second edge (P4) form a first included angle, a second state (S2) in which the first edge (P3) and the second edge (P4) form a second included angle (A2) that is greater than the first included angle (A1) and less than 180 degrees, a third state (S3) in which the first edge (P3) and the second edge (P4) form a third included angle that is greater than the second included angle (A2) and less than 180 degrees, and an unfolded state (Su) in which the first edge (P3) and the second edge (P4) form 180 degrees.

[0211] The hinge structure (200) may include: a fixed structure (230); a first rotating structure (210) coupled to the fixed structure (230) to rotate around a first rotation axis (R1) parallel to the axial direction and connected to the first housing (110); and a second rotating structure (220) coupled to the fixed structure (230) to rotate around a second rotation axis (R2) parallel to the axial direction and connected to the second housing (120).

[0212] In one embodiment, the hinge structure (200) may include a torque structure for providing torque related to the rotation of the first rotational structure (210) and the second rotational structure (220).

[0213] The torque structure comprises a first arm shaft (241) and a second arm shaft (242) that are rotatably connected to the fixed structure (230) and each extend in the axial direction;

[0214] A first arm portion (250) coupled to the first arm shaft (241) and connected to the first rotating structure (210) so as to rotate together with the first arm shaft (241), the first arm portion (250) includes a first coupling portion (251) coupled to a part of the first arm shaft (241), and a second coupling portion (252) spaced apart from the first coupling portion (251) in the axial direction and coupled to another part of the first arm shaft (241);

[0215] A second arm portion (260) coupled to the second arm shaft (242) to rotate together with the second arm shaft (242) and connected to the second rotating structure (220), the second arm portion (260) includes a third coupling portion (261) coupled to a part of the second arm shaft (242), and a fourth coupling portion (262) spaced apart from the third coupling portion (261) in the axial direction and coupled to another part of the second arm shaft (242);

[0216] The first female part (250) comprises a first female cam (254) formed in the first connecting part (251) and formed in the periphery of the first female shaft (241), and a second female cam (255) formed in the second connecting part (252) and formed in the periphery of the first female shaft (241); the second female part (260) comprises a third female cam (264) formed in the third connecting part (261) and formed in the periphery of the second female shaft (242), and a fourth female cam (265) formed in the fourth connecting part (262) and formed in the periphery of the second female shaft (242).

[0217] A first cam member (270) comprising: a first cam portion (270a) including a first moving cam (271) located between the first coupling portion (251) and the second coupling portion (252) of the first arm portion (250), through which the first arm shaft (241) passes and engages with the first arm cam (254); a second cam portion (270b) including a second moving cam (272) located between the third coupling portion and the fourth coupling portion (262) of the second arm portion (260), through which the second arm shaft (242) passes and engages with the third arm cam (264); and a first bridge portion (270c) connecting the first cam portion (270a) and the second cam portion (270b);

[0218] A second cam member (280) comprising: a third cam portion (280a) including a third moving cam (281) located between the first coupling portion (251) and the second coupling portion (252) of the first arm portion (250), through which the first arm shaft (241) passes and engages with the second arm cam (255); a fourth cam portion (280b) including a fourth moving cam (282) located between the third coupling portion (261) and the fourth coupling portion (262) of the second arm portion (260), through which the second arm shaft (242) passes and engages with the fourth arm cam (265); and a second bridge portion (280c) connecting the third cam portion (280a) and the fourth cam portion (280b);

[0219] A first elastic member (291) positioned between the first cam portion (270a) of the first cam member (270) and the third cam portion (280a) of the second cam member (280) and coupled to the first arm shaft (241); and

[0220] It may include a second elastic member (292) located between the second cam portion (270b) of the first cam member (270) and the fourth cam portion (280b) of the second cam member (280) and coupled to the second arm shaft (242).

[0221] The first cam member (270) and the second cam member (280) may be configured to move linearly in the axial direction to compress the first elastic member (291) and the second elastic member (292), or to tension the second elastic member (292).

[0222] In one embodiment, each of the first female cam (254) and the third female cam (264) may include a first protrusion (254a) that protrudes toward the first moving cam (271) and the second moving cam (272).

[0223] In one embodiment, each of the second arm cam (255) and the fourth arm cam (265) may include a second protrusion (255a) that protrudes toward the third moving cam (281) and the fourth moving cam (282).

[0224] In one embodiment, each of the first moving cam (271) and the second moving cam (272) of the first cam member (270) may include a third protrusion (271a) protruding toward the first female cam (254) and the third female cam (264), and a third recess (271b) located on both sides of the third protrusion (271a).

[0225] In one embodiment, each of the third moving cam (281) and the fourth moving cam (282) of the second cam member (280) comprises: a fourth protrusion (281a) protruding toward the second arm cam (255) and the fourth arm cam (265); a fourth recess (281b) located on one side of the fourth protrusion (281a); a third inclined surface (281e) extending from the fourth recess (281b) to the fourth protrusion (281a); a fifth protrusion (281c) located on the other side of the fourth protrusion (281a) and protruding toward the second arm cam (255) and the fourth arm cam (265); a fifth recess (281d) located between the fourth protrusion (281a) and the fifth protrusion (281c); and the fifth from the fourth protrusion (281a). It may include a fourth inclined surface (281f) extending to a depression (281d), and a fifth inclined surface (281g) extending from the fifth depression (281d) to the fifth protrusion (281c).

[0226] In one embodiment, the hinge structure (200) may be configured such that, in the fully folded state (Sf), the second protrusion (255a) contacts the fourth inclined surface (281f), in the first state (S1), the second protrusion (255a) contacts the fourth protrusion (281a), and in the second state (S2), at least a portion of the second protrusion (255a) is received in the fifth recess (281d).

[0227] In one embodiment, the hinge structure (200) may be configured such that when unfolded from the fully folded state (Sf) to the second state (S2), the second protrusion (255a) moves beyond the fourth protrusion (281a) to the fifth depression (281d).

[0228] In various embodiments, the electronic device comprises a third-1 state (S3-1) in which the first edge (P3) and the second edge (P4) form a third-1 angle (A31) that is greater than the second angle (A2) and less than 180 degrees, a third-2 state (S3-2) in which a third-2 angle (A32) that is greater than the third-1 angle (A31) and less than 180 degrees, and a free stop section defined from the third-1 state (S3-1) to the third-2 state (S3-2), wherein in the free stop section, the first cam member (270) and the second cam member (280) are each fixed at a position specified in the axial direction, and the first elastic member (291) and the second elastic member (292) can maintain a compressed state compared to the second state (S2).

[0229] In various embodiments, in the free stop section, the hinge structure (200) may be configured such that the first protrusion (254a) contacts the third protrusion (271a) and the second protrusion (255a) contacts the fifth protrusion (281c).

[0230] In various embodiments, the hinge structure (200) may be configured such that when entering the free stop section, the first protrusion (254a) begins to contact the third protrusion (271a) and simultaneously the second protrusion (255a) begins to contact the fifth protrusion (281c), and when exiting the free stop section, the hinge structure (200) may be configured such that when exiting the free stop section, the first protrusion (254a) ends to contact the third protrusion (271a) and simultaneously the second protrusion (255a) ends to contact the fifth protrusion (281c).

[0231] In various embodiments, the hinge structure (200) may be configured such that the first elastic member (291) and the second elastic member (292) are tensioned when moving from the free stop section to the unfolded state.

[0232] In various embodiments, the hinge structure (200) may be configured such that the first elastic member (291) and the second elastic member (292) have a first length in the axial direction in the fully folded state, have a second length smaller than the first length in the first state, and have a third length larger than the first length in the second state.

[0233] In various embodiments, the hinge structure may be configured such that the first elastic member (291) and the second elastic member (292) are compressed by a first displacement (ΔL1) in the axial direction when moving from the fully folded state to the first state (S1), and are stretched by a second displacement (ΔL2) greater than the first displacement (ΔL1) in the axial direction when moving from the first state (S1) to the second state (S2).

[0234] In various embodiments, the hinge structure (200) may be configured such that when moving from the fully folded state (Sf) to the second state (S2), at least a portion of the first protrusion (254a) is located inside the third depression (271b).

[0235] In various embodiments, the first cam member (270) can be fixed at a designated position when moving from the fully folded state (Sf) to the second state (S2) when viewed in the axial direction.

[0236] In various embodiments, the first arm shaft (241) and the second arm shaft (242) may be configured to rotate by a first rotation angle from the fully folded state to the first state (S1), and to rotate by a second rotation angle greater than the first rotation angle from the first state (S1) to the second state (S2).

[0237] In various embodiments, the fourth protrusion (281a) may protrude to a fourth height (h4) from either the fourth depression (281b) or the fifth depression (281d), and the fifth protrusion (281c) may protrude to a fifth height (h5) greater than the fourth height (h4) from either the fourth depression (281b) or the fifth depression (281d).

[0238] In various embodiments, the first elastic member (291) and the second elastic member (292) are configured to be compressed by a first displacement (ΔL1) in the axial direction when moving from the fully folded state to the first state (S1), and to be stretched by a second displacement (ΔL2) in the axial direction which is greater than the first displacement (ΔL1) when moving from the first state (S1) to the second state (S2), and the fourth height (h4) may be greater than the first displacement (ΔL1) and substantially equal to the second displacement (ΔL2).

[0239] In various embodiments, the second cam member (280) may be spaced apart from the first cam member (270) by a first distance in the fully folded state when viewed in the axial direction, spaced apart from the first cam member (270) by a second distance smaller than the first distance in the first state (S1), and spaced apart by a third distance larger than the first distance in the second state (S2).

[0240] In various embodiments, the fourth protrusion (281a) and the fifth protrusion (281c) each include a substantially flat protruding surface, and the protruding surface included in the fourth protrusion (281a) may have a smaller area than the protruding surface included in the fifth protrusion (281c).

[0241] In various embodiments, each of the third moving cam (281) and the fourth moving cam (282) is defined with a circumferential direction centered on the first arm axis (241) and the second arm axis (242), and the protruding surface of the fourth protrusion (281a) is extended to have a first angular displacement along the circumferential direction, and the protruding surface of the fifth protrusion (281c) can be extended to have a second angular displacement greater than the first angular displacement along the circumferential direction.

[0242] An electronic device according to embodiments disclosed in this document may include: a housing comprising a first housing (110) having a first edge (P3) parallel to the axial direction and a second housing (120) having a second edge (P4) parallel to the axial direction; a display (140) extending from the first housing (110) to the second housing (120); and a hinge structure (200) connected to each of the first housing (110) and the second housing (120) such that the first housing (110) rotates around a first rotation axis (R1) parallel to the axial direction and the second housing (120) rotates around a second rotation axis (R2) parallel to the axial direction.

[0243] The electronic device (100) comprises: a fully folded state (Sf) in which the first edge (P3) and the second edge (P4) are in at least partial contact; a first state in which the first edge (P3) and the second edge (P4) form a first included angle; a second state (S2) in which the first edge (P3) and the second edge (P4) form a second included angle (A2) that is greater than the first included angle (A1) and less than 180 degrees; a third-1 state (S3-1) in which the first edge and the second edge form a third-1 included angle (A31) that is greater than the second included angle and less than 180 degrees; a third-2 state (S3-2) in which the first edge and the second edge (P4) form a third-2 included angle that is greater than the third-1 included angle (A31) and less than 180 degrees; and the first edge (P3) and The second edge (P4) may include an unfolded state forming 180 degrees.

[0244] The electronic device may include a folding detent section defined from the fully folded state (Sf) to the first state (S1), an automatic unfolding section defined from the first state (S1) to the second state (S2), a free stop section defined from the third-1 state (S3-1) to the third-2 state (S3-2), and an unfolding detent section defined from the third-2 state (S3-2) to the unfolded state (Su).

[0245] The hinge structure may include a first arm shaft (241) that rotates in conjunction with the rotation of the first rotating structure (210), a first cam structure (254, 271, 281, 255) coupled to the first arm shaft (241), and a first elastic member (291) configured to be compressed or tensioned by the first cam structure (254, 271, 281, 255), and may include a second arm shaft (242) that rotates in conjunction with the rotation of the second rotating structure (220), a second cam structure (264, 272, 282, 265) coupled to the second arm shaft (242), and a second elastic member (292) configured to be compressed or tensioned by the second cam structure (264, 272, 282, 265).

[0246] The first elastic member (291) and the second elastic member (292) may be configured to be compressed as the pinch angle (A) increases in the folding detent section, and to be tensioned as the pinch angle (A) increases in the automatic unfolding section and the unfolding detent section.

[0247] In various embodiments, when an unfolding trigger is applied to operate such that the clamped angle (A) becomes larger than the first angle (A1) from the fully folded state (Sf), the electronic device may be configured to provide a semi-automatic unfolding function that unfolds to the second angle (A2) by the elastic force of the first elastic member (291) and the second elastic member (292).

[0248] In various embodiments, the difference between the second angle (A2) and the first angle (A1) is greater than the difference between the first angle (A1) and the angle of insertion in the fully folded state (Sf), and the difference between the second angle (A2) and the first angle (A1) may be smaller than the difference between the 3-2 angle (A32) and the 3-1 angle (A31).

[0249] In various embodiments, the slope of the length change of the first elastic member (291) and the second elastic member (292) with respect to the increase in the interlocking angle (A) is defined, and the slope is formed as a positive value in each of the folding detent section and the section moving from the second state (S2) to the third-1 state (S3-1), and the slope is formed as a negative value in each of the automatic unfolding section and the unfolding detent section, and the slope may be formed to have a first size (g1) in the automatic unfolding section and a second size (g2) smaller than the first size (g1) in the unfolding detent section.

[0250] In various embodiments, the first elastic member (291) and the second elastic member (292) may be configured to maintain a compressed state regardless of the interlocking angle (A) in the free stop section.

[0252] FIG. 15 is a drawing illustrating another example of a cam of a hinge structure according to one embodiment.

[0253] Referring to FIG. 15(a), a cam structure (1500) according to one embodiment may include a first cam structure (1500a) coupled to a first arm shaft (241) and a second cam structure (1500b) coupled to a second arm shaft (242).

[0254] Each of the first cam structure (1500a) and the second cam structure (1500b) may include a plurality of protrusions (M1, M2, M3) and a plurality of recesses (V1, V2, V3). Although FIG. 15(a) is illustrated as having a cam (1500) having three protrusions (M1, M2, M3) and three recesses (V1, V2, V3), the present invention is not limited thereto. For example, the cam structure (1500) may have a structure including two or more protrusions and recesses.

[0255] In one embodiment, the plurality of protrusions (M1, M2, M3) may all have the same structure. Alternatively, at least one of the plurality of protrusions (M1, M2, M3) may have a shape different from the other protrusions. In some embodiments, the plurality of protrusions (M1, M2, M3) may include a protrusion having a third inclination angle (as3) as shown in FIG. 15(b), and a protrusion having a flat protruding surface (e.g., the protrusions of FIG. 15 (254a, 255a, 271a, 281c)).

[0256] In describing the illustrated embodiment, circumferential directions (C1, C2) centered on the female axis (241, 242) to which the illustrated cam structure (1500) is coupled are defined. The circumferential directions (C1, C2) may be directions perpendicular to the axial direction. For example, in the first cam structure (1500a), the first circumferential direction (C1) may be counterclockwise and may be to the right with respect to FIG. 15(b). In the first cam structure (1500a), the second circumferential direction (C2) may be clockwise and may be to the left with respect to FIG. 15(b). For example, in the second cam structure (1500b), the first circumferential direction (C1) may be clockwise and may be to the right with respect to FIG. 15(b). In the second cam structure (1500b), the second circumferential direction (C2) is counterclockwise and may be to the left with respect to Fig. 15(b).

[0257] The above description focuses on the first protrusion (M1) among the plurality of protrusions (M1, M2, M3).

[0258] In one embodiment, the cam structure (1500) may include a first protrusion (M1), a first depression (V1), and a second depression (V2). Referring to the drawings, a first depression (V1) may be formed on one side of the circumferential direction (C) of the first protrusion (M1), and a second depression (V2) may be formed on the other side. In one embodiment, the first protrusion (M1) may include a first part (P1) including a first inclined surface (1510), a second part (P2) including a second inclined surface (1520), and a third part (P3) including a third inclined surface (1530).

[0259] In one embodiment, the first inclined surface (1510) may extend from the first recessed surface (1540) of the first recess (V1) to the protruding surface of the first protrusion (M1) when viewed in the first circumferential direction (C1). For example, the first inclined surface (1510) may extend upwardly inclined from the first recessed surface when viewed in the first circumferential direction (C1) and downwardly inclined from the protruding surface of the first protrusion (M1) when viewed in the second circumferential direction (C2). In one embodiment, the first inclined surface (1510) may have a first angle of inclination (as1) with respect to the circumferential direction (C). In various embodiments, the first angle of inclination (as1) may be different from the second angle of inclination (as2).

[0260] In one embodiment, the second inclined surface (1520) may extend from the protruding surface of the first protrusion (M1) to the second recessed surface (1550) of the second recessed portion (V2) when viewed in the first circumferential direction (C1). For example, the second inclined surface (1520) may extend downwardly inclined from the protruding surface of the first protrusion (M1) when viewed in the first circumferential direction (C1), and extend upwardly inclined from the second recessed surface (1550) when viewed in the second circumferential direction (C2). In one embodiment, the second inclined surface (1520) may have a second angle of inclination (as2) with respect to the circumferential direction (C). In various embodiments, the second angle of inclination (as2) may be different from the first angle of inclination (as1).

[0261] In one embodiment, the protruding surface of the first protrusion (M1) may include a third inclined surface (1530). The third inclined surface (1530) may extend from the first inclined surface (1510) to the second inclined surface (1520) when viewed in the first circumferential direction (C1). For example, the third inclined surface (1530) may extend upwardly inclined from the first inclined surface (1510) when viewed in the first circumferential direction (C1) and downwardly inclined from the second inclined surface (1520) when viewed in the second circumferential direction (C2). In one embodiment, the third inclined surface (1530) may have a third angle of inclination (as3) with respect to the circumferential direction (C). For example, the absolute value of the third angle of inclination (as3) may be smaller than the absolute values ​​of the first angle of inclination (as1) and the second angle of inclination (as2), respectively.

[0262] In various embodiments, the first inclination angle (as1), the second inclination angle (as2), and the third inclination angle (as3) may include an acute angle less than 90 degrees with respect to the circumferential direction (C).

[0263] In various embodiments, the first inclined surface (1510) and the third inclined surface (1530) may be connected by being rounded with a first curvature. The second inclined surface (1520) and the third inclined surface (1530) may be connected by being rounded with a second curvature. For example, the protruding surface of the first protrusion (M1) may further include rounded curved areas formed on both sides of the third inclined surface (1530).

[0265] FIG. 16 is a drawing illustrating another example of the first cam structures and the second cam structures of a hinge structure according to one embodiment. FIG. 16 is a drawing illustrating the case where the hinge structure is in a free-stop state. For example, at least one of the cam structures shown in FIG. 16 may include the cam shown in FIG. 15.

[0266] When the electronic device (100) and / or hinge structure (200) is unfolded, the direction in which the arm axis (241, 242) rotates can be defined as the unfolding direction. For example, the unfolding direction may be the direction in which the interlocking angle (A) of FIG. 9 increases.

[0267] The illustrated first cam structures (1500a) are structures coupled to or located on the first arm axis (241) and may include a first arm cam (254), a first moving cam (271) of the first cam member (270), a third moving cam (281) of the second cam member (280), and a second arm cam (255). For example, referring together with FIG. 7, when the electronic device and / or hinge structure is unfolded, the first arm cam (254) and the second arm cam (255) rotate counterclockwise together with the first arm axis (241), and the first arm cam (254) and the second arm cam (255) may move to the right in the profile illustrated in FIG. 8. Additionally, the first cam member (270) and the second cam member (280) may move linearly in the axial direction.

[0268] The illustrated second cam structures (1500b) are structures coupled to or located on the second arm axis (242) and may include a third arm cam (264), a second moving cam (272) of the first cam member (270), a fourth moving cam (282) of the second cam member (280), and a fourth arm cam (265). For example, referring together with FIG. 7, when the electronic device (100) and / or hinge structure (200) is unfolded, the third arm cam (264) and the fourth arm cam (265) rotate clockwise together with the second arm axis (242), and the third arm cam (264) and the fourth arm cam (265) may move to the right in the profile illustrated in FIG. 8.

[0269] In the electronic device (100) and / or hinge structure (200) in a folded state (e.g., FIG. 2b, FIG. 2c), a restoring torque due to the restoring force of the display may be applied to the first arm axis (241) and the second arm axis (242). The restoring torque of the display may be a force acting due to the nature of a curved portion of the surface (e.g., the folding area (143) in FIG. 2b, FIG. 2c) to deform into a flat surface. That is, the restoring torque of the display may act in the unfolding direction. For example, referring to FIG. 6 and FIG. 7, the restoring torque of the display may act counterclockwise on the first arm axis (241), the first arm portion (250), and the first rotational structure (210), and the restoring torque of the display may act clockwise on the second arm axis (242), the second arm portion (260), and the second rotational structure (220). The restoring torque of the display may be greater as it approaches a fully folded state. The restoring torque of the display may be greater as the thickness of the display increases or the area increases. For example, an electronic device including a large display may perform an unintended unfolding motion by the restoring torque. For example, the electronic device (100) and / or the hinge structure (200) may unfold without maintaining a free-stop state. To solve this, the hinge structure (200) and / or the electronic device (100) according to one embodiment include a friction structure (202) for providing frictional torque to the arm axis, and the frictional torque acts in the folding direction in the free-stop section and may be greater than the restoring torque of the display.

[0270] The first cam structures (1500a) may have surface contact between the protrusions (M) in the free-stop section. The protrusions (M) of the first cam structures (1500a) may include a third inclined surface (e.g., the third inclined surface (1530) of FIG. 15) formed to have surface contact with each other in the free-stop section. For example, the first arm cam (254) may include a third-1 inclined surface (1531), the first moving cam (271) may include a third-2 inclined surface (1532), the third moving cam (281) may include a third-3 inclined surface (1533), and the second arm cam (255) may include a third-4 inclined surface (1534).

[0271] The third inclined surfaces (1531, 1532, 1533, 1534) included in the first cam structures (1500a) may be formed to be inclined in a direction in which the first elastic member (291) is further compressed when the unfolding operation is performed within the free stop section. For example, the first arm cam (254) and the second arm cam (255) move to the left, which is the unfolding direction, and as they move to the left, the first moving cam (271) of the first cam member (270) moves in the second axial direction (②), the third moving cam (281) of the second cam member (280) moves in the first axial direction (①), and the first elastic member (291) can be compressed. For example, the third inclined surfaces (1531, 1532, 1533, 1534) may be inclined in a direction in which the axial spacing between the first cam member (270) and the second cam member (280) decreases when the unfolding operation is performed in the free stop section.

[0272] For example, the 3-1 inclined surface (1531) of the first arm cam (254) may be formed to be inclined toward the first axial direction (①) as it unfolds. For example, the 3-2 inclined surface (1532) of the first moving cam (271) of the first cam member (270) may be formed to be inclined toward the first axial direction (①) as it unfolds. For example, the 3-3 inclined surface (1533) of the third moving cam (281) of the second cam member (280) may be formed to be inclined toward the second axial direction (②) as it unfolds. For example, the 3-4 inclined surface (1534) of the second arm cam (255) may be formed to be inclined toward the second axial direction (②) as it unfolds.

[0273] In one embodiment, the first arm cam (254) and the second arm cam (255) that rotate together with the first arm shaft (241) may be formed at an angle such that the third inclined surface (1531, 1534) becomes lower in the unfolding direction in the free stop section. In one embodiment, the first moving cam (271) and the third moving cam (281) that do not rotate together with the first arm shaft (241) may be formed at an angle such that the protrusion height becomes higher when viewed in the unfolding direction in the free stop section.

[0274] In one embodiment, the first elastic member (291) can be gradually compressed as the unfolding motion (e.g., the first arm cam (254) and the second arm cam (255) move to the left) progresses in the free stop section.

[0275] Referring to the drawings, the first cam structures (1500a) that interlock with each other are shown to have third inclined surfaces (1531, 1532, 1533, 1534) of corresponding shapes, but the shape of the first cam structures (1500a) of the hinge structure according to one embodiment is not necessarily limited thereto. For example, either the protrusion (M) of the first female cam (254) that interlocks with each other and the protrusion (M) of the first moving cam (271) of the first cam member (270) may include a third inclined surface (1531, 1532), and the other may include a flat protrusion (e.g., FIG. 12). For example, either of the protrusion (M) of the third moving cam (281) of the second cam member (280) and the protrusion (M) of the second arm cam (255) that interlock with each other may include a third inclined surface (1533, 1534), and the other may include a flat protruding surface (e.g., FIG. 12).

[0276] The second cam structures (1500b) may have surface contact between the protrusions (M) in the free-stop section. The protrusions (M) of the second cam structures (1500b) may include a third inclined surface (e.g., the third inclined surface (1530) of FIG. 15) formed to have surface contact with each other in the free-stop section. For example, the third arm cam (264) may include a third-fifth inclined surface (1535), the second moving cam (272) may include a third-sixth inclined surface (1536), the fourth moving cam (282) may include a third-seventh inclined surface (1537), and the fourth arm cam (265) may include a third-eighth inclined surface (1538).

[0277] The third inclined surfaces (1535, 1536, 1537, 1538) included in the second cam structures (1500b) may be formed to be inclined in a direction in which the second elastic member (292) is further compressed when the unfolding operation is performed within the free stop section. For example, the third arm cam (264) and the fourth arm cam (265) move to the right, which is the unfolding direction, and as they move to the right, the second moving cam (272) of the first cam member (270) moves in the second axial direction (②), the fourth moving cam (282) of the second cam member (280) moves in the first axial direction (①), and the second elastic member (292) can be compressed. For example, the third inclined surfaces (1535, 1536, 1537, 1538) may be inclined in a direction in which the axial spacing between the first cam member (270) and the second cam member (280) decreases when the unfolding operation is performed in the free stop section.

[0278] For example, the 3-5 inclined surface (1535) of the 3rd arm cam (264) may be formed to be inclined toward the 1st axial direction (①) as it unfolds. For example, the 3-6 inclined surface (1536) of the 2nd moving cam (272) of the 1st cam member (270) may be formed to be inclined toward the 1st axial direction (①) as it unfolds. For example, the 3-7 inclined surface (1537) of the 4th moving cam (282) of the 2nd cam member (280) may be formed to be inclined toward the 2nd axial direction (②) as it unfolds. For example, the 3-8 inclined surface (1538) of the 4th arm cam (265) may be formed to be inclined toward the 2nd axial direction (②) as it unfolds.

[0279] In one embodiment, the third arm cam (264) and the fourth arm cam (265) that rotate together with the second arm shaft (242) may be formed with a third inclined surface (1535, 1538) such that the protrusion height decreases as it moves in the unfolding direction in the free stop section. In one embodiment, the second moving cam (272) and the fourth moving cam (282) that do not rotate together with the second arm shaft (242) may be formed with a slope such that the protrusion height increases when viewed in the unfolding direction in the free stop section.

[0280] In one embodiment, the second elastic member (292) can be gradually compressed as the unfolding motion (e.g., the third arm cam (264) and the fourth arm cam (265) move to the right) proceeds in the free stop section.

[0281] Referring to the drawings, the interlocking second cam structures (1500b) are shown having third inclined surfaces (1535, 1536, 1537, 1538) of corresponding shapes, but the shape of the second cam structures (1500b) of the hinge structure according to one embodiment is not necessarily limited thereto. For example, either the protrusion (M) of the interlocking third arm cam (264) and the protrusion (M) of the second moving cam (272) of the first cam member (270) may include a third inclined surface (1535, 1536), and the other may include a flat protrusion (e.g., FIG. 12). For example, either of the protrusion (M) of the fourth moving cam (282) of the second cam member (280) and the protrusion (M) of the fourth arm cam (265) that interlock with each other may include a third inclined surface (1537, 1538), and the other may include a flat protruding surface (e.g., FIG. 12).

[0283] In one embodiment, the hinge structure (200) may be configured such that, in the free-stop section, the rotational torque required to perform the unfolding operation is greater than the rotational torque required to perform the folding operation. For example, referring to the drawings, in the free-stop section, the unfolding direction may be the direction in which the elastic members (291, 292) are compressed, and in the free-stop section, the folding direction may be the direction in which the elastic members (291, 292) are tensioned. In various embodiments, the rotational torque required to perform the unfolding operation (e.g., frictional torque provided by the friction structure (202)) may be greater than the restoring torque of the display.

[0284] In one embodiment, the electronic device (100) and the hinge structure (200) can provide a frictional torque greater than the restoration torque of the display so that the elastic members (291, 292) are not compressed even though the restoration torque of the display in the unfolding direction is applied in the free stop section. By doing so, the electronic device (100) and the hinge structure (200) can maintain any state included in the free stop section.

[0285] Accordingly, the hinge structure (200) according to one embodiment may include a third inclined surface (1530) inclined so that the elastic members (291, 292) are further compressed during the unfolding operation in the free stop section, taking into account that the restoring torque of the display acts in the unfolding direction. Through this, it is possible to prevent an unintended unfolding operation by the user from being performed as an unfolding operation caused by the restoring torque of the display.

[0287] An electronic device according to embodiments disclosed in this document comprises a first housing (110), a second housing (120), and a hinge structure (200) connected to the first housing (110) and the second housing (120) such that the first housing (110) rotates around a first rotation axis (R1) parallel to the axial direction and the second housing (120) rotates around a second rotation axis (R2) parallel to the axial direction.

[0288] The hinge structure (200) comprises: a first arm shaft (241) coupled to the rotation of the first housing (110) and parallel to the axial direction; a second arm shaft (242) coupled to the rotation of the second housing (120) and parallel to the axial direction; a first arm cam (254) and a second arm cam (255) rotating together with the first arm shaft (241); a third arm cam (264) and a fourth arm cam (265) rotating together with the second arm shaft (242); a first cam member (270) comprising a first moving cam (271) coupled to the first arm cam (254) and a second moving cam (272) coupled to the third arm cam (264), wherein the first cam member (270) is configured to move in the axial direction along the first arm shaft (241) and the second arm shaft (242). A second cam member (280) comprising a third moving cam (281) coupled to the second arm cam (255) and a fourth moving cam (282) coupled to the fourth arm cam (265), wherein the second cam member (280) is configured to move in the axial direction along the first arm shaft (241) and the second arm shaft (242); a first elastic member (291) coupled to the first arm shaft (241) and disposed between the first cam member (270) and the second cam member (280); and a second elastic member (292) coupled to the second arm shaft (242) and disposed between the first cam member (270) and the second cam member (280);

[0289] The electronic device (100) includes a free stop section defined between a fully folded state (Sf) and an unfolded state (Su), a first state (S1) defined between the free stop section and the fully folded state (Sf), and a second state (S2) defined between the free stop section and the fully folded state and being more unfolded than the first state (S1).

[0290] The hinge structure (200) may be configured such that when the electronic device (100) moves from the fully folded state (Sf) to the second state (S2), the first cam member (270) is fixed at a position specified in the axial direction and the second cam member (280) moves in the axial direction.

[0291] In various embodiments, the hinge structure (200) may be configured such that when the electronic device (100) moves from the fully folded state (Sf) to the first state (S1), the second cam member (280) moves in a direction toward the first cam member (270) and the first elastic member (291) and the second elastic member (292) are compressed, and when the electronic device (100) moves from the first state (S1) to the second state (S2), the second cam member (280) moves in a direction toward the first cam member (270) and the first elastic member (291) and the second elastic member (292) are tensioned.

[0292] In various embodiments, each of the first elastic member (291) and the second elastic member (292) may be configured to be compressed by a first displacement (ΔL1) from the fully folded state (Sf) to the first state (S1), and to be stretched by a second displacement (ΔL2) greater than the first displacement (ΔL1) from the first state (S1) to the second state (S2).

[0293] In various embodiments, when the electronic device (100) moves from the second state (S2) to the free stop section, the hinge structure (200) may be configured such that the first cam member (270) and the second cam member (280) each move in a direction that brings them closer to each other, and the first elastic member (291) and the second elastic member (292) are compressed by a third displacement.

[0294] In various embodiments, the third displacement may be smaller than the second displacement (ΔL2) or substantially the same as the second displacement (ΔL2).

[0295] In various embodiments, when the electronic device (100) moves from the free stop section to the unfolded state (Su), the hinge structure (200) may be configured such that the first cam member (270) and the second cam member (280) each move away from each other, and the first elastic member (291) and the second elastic member (292) are tensioned.

[0296] In various embodiments, each of the first cam member (270) and the second cam member (280) is fixed at a position designated in the axial direction so as to move closer to each other or maintain a constant distance from each other as the electronic device (100) unfolds in the free stop section, and each of the first elastic member (291) and the second elastic member (292) can be compressed or maintain a constant compressed state as the electronic device (100) unfolds in the free stop section.

[0297] In various embodiments, the first female cam (254) and the third female cam (264) each include a first protrusion (254a), the second female cam (255) and the fourth female cam (265) each include a second protrusion (255a), the first moving cam (271) and the second moving cam (272) each include a third protrusion (271a) protruding toward the first female cam (254) and the third female cam (264), and the third moving cam (281) and the fourth moving cam (282) each include a fourth protrusion (281a) protruding toward the second female cam (255) and the fourth female cam (265) to a fourth height (h4), and a fifth protrusion smaller than the fourth height (h4) protruding toward the second female cam (255) and the fourth female cam (265). It may include a fifth protrusion (281c) that protrudes with height (h5) and is located in the unfolding direction relative to the fourth protrusion (281a), and the second protrusion (255a) may be configured to at least partially contact the fifth protrusion (281c) in the free stop section, at least partially contact the fourth protrusion (281a) in the first state (S1), and at least partially receive the fourth depression (281b) formed between the fourth protrusion (281a) and the fifth protrusion (281c) in the second state (S2).

[0298] In various embodiments, the protruding surface of the fifth protrusion (281c) may have a larger area than the protruding surface of the fourth protrusion (281a).

[0299] In various embodiments, in the fully folded state, the first protrusion (254a) may be located in the third recess (271b) of each of the first moving cam (271) and the second moving cam (272), and the second protrusion (255a) may be located on the inclined surface of the fourth protrusion (281a).

[0300] In various embodiments, when the electronic device (100) moves from the fully folded state (Sf) to the second state (S2), the first protrusion (254a) is positioned in the third recess (271b) of each of the first moving cam (271) and the second moving cam (272), the second protrusion (255a) moves beyond the fourth protrusion (281a) into the fourth recess (281b) between the fourth protrusion (281a) and the fifth protrusion (281c), and the first moving cam (271) and the second moving cam (272) can be fixed at a position specified in the axial direction.

[0301] In various embodiments, when the electronic device (100) moves from the fully folded state (Sf) to the first state (S1), the first protrusion (254a) is located at the third recess (271b), the second protrusion (255a) moves along the inclined surface of the fourth protrusion (281a) to the protruding surface of the fourth protrusion (281a), and the first elastic member (291) and the second elastic member (292) can be compressed by the movement of the first cam member (270).

[0302] In various embodiments, when the electronic device (100) moves from the first state (S1) to the second state (S2), the first protrusion (254a) is located at the third depression (271b), the second protrusion (255a) moves along an inclined surface from the protruding surface of the fourth protrusion (281a) to the fourth depression (281b), and the first elastic member (291) and the second elastic member (292) can be tensioned by the movement of the first cam member (270).

[0303] In various embodiments, when the electronic device (100) moves from the second state (S2) to the free stop section, the first protrusion (254a) moves along the inclined surface of the third protrusion (271a) to the protruding surface of the third protrusion (271a), the second protrusion (255a) moves along the inclined surface of the fifth protrusion (281c) to the protruding surface of the fifth protrusion (281c), and the first elastic member (291) and the second elastic member (292) can be compressed by the movement of the first cam member (270) and the second cam member (280), respectively.

[0304] In various embodiments, when the electronic device (100) moves from the free stop section to the unfolded state (Su), the first protrusion (254a) moves along the inclined surface of the third protrusion (271a), the second protrusion (255a) moves along the inclined surface of the fifth protrusion (281c), and the first elastic member (291) and the second elastic member (292) can be tensioned by the movement of the first cam member (270) and the second cam member (280), respectively.

[0305] An electronic device according to embodiments disclosed in this document comprises a first housing (110), a second housing (120), a display (140) extending to a first surface (141) of the first housing (110) and a second surface (142) of the second housing (120), and a hinge structure (200) connected to the first housing (110) and the second housing (120), wherein the first housing (110) rotates around a first rotation axis (R1) and the second housing (120) rotates around a second rotation axis (R2) parallel to the first rotation axis (R1), thereby the first surface (141) and the second surface (142) form a predetermined interlocking angle (A).

[0306] The electronic device (100) comprises an unfolded state (Su) in which the first surface (141) and the second surface (142) form a substantially continuous plane, and a fully folded state (Sf) in which the first housing (110) and the second housing (120) are rotated so that the edge (P1) of the first housing (110) and the edge (P2) of the second housing (120) are in at least partial contact.

[0307] The hinge structure (200) comprises a first arm shaft (241) linked to the rotation of the first housing (110), a first elastic member (291) disposed on the first arm shaft (241) to provide elastic force in the extension direction of the first arm shaft (241), a second arm shaft (242) linked to the rotation of the second housing (120), and a second elastic member (292) disposed on the second arm shaft (242) to provide elastic force in the extension direction of the second arm shaft (242).

[0308] The hinge structure (200) comprises: a folding detent section defined from the fully folded state (Sf) to a first state (S1) having a first pinch angle (A1), wherein each of the first elastic member (291) and the second elastic member (292) is compressed by a first displacement (ΔL1) as the pinch angle (A) increases in the folding detent section; an automatic unfolding section defined from the first state (S1) to a second state (S2) having a second pinch angle (A2) greater than the first pinch angle (A1), wherein each of the first elastic member (291) and the second elastic member (292) is stretched by a second displacement (ΔL2) as the pinch angle (A) increases in the automatic unfolding section; It may include a free stop section defined from a third-1 state (S31) having a third-1 interlocking angle (A31) greater than the second interlocking angle (A2) to a third-2 state (S32) having a third-2 interlocking angle (A32) greater than the third-1 interlocking angle (A31), wherein each of the first elastic member (291) and the second elastic member (292) maintains a constant compression state independently of the interlocking angle (A) in the free stop section, or is compressed as the interlocking angle (A) increases; and a spreading detent section defined between the third-2 state (S32) and the spreading state (Su), wherein each of the first elastic member (291) and the second elastic member (292) is stretched by a third displacement (ΔL3) as the interlocking angle (A) increases in the spreading detent section.

[0309] In various embodiments, the magnitude of the first displacement (ΔL1) may be smaller than the magnitude of the second displacement (ΔL2).

[0310] In various embodiments, the magnitude of the third displacement (ΔL3) may be substantially the same as the magnitude of the second displacement (ΔL2).

[0311] In various embodiments, the magnitude of the first slope (g1), which is the ratio of the second displacement (ΔL2) to the increase (A2-A1) of the interlocking angle (A) in the automatic unfolding section, may be larger than the magnitude of the second slope (g2), which is the ratio of the third displacement (ΔL3) to the increase (A) of the interlocking angle in the unfolding detent section.

[0312] In various embodiments, the hinge structure (200) is configured to provide torque to each of the first arm shaft (241) and the second arm shaft (242) in a direction in which the pinch angle (A) decreases in the folding detent section, and to provide torque to each of the first arm shaft (241) and the second arm shaft (242) in a direction in which the pinch angle (A) increases in the automatic unfolding section and the unfolding detent section, and when the pinch angle (A) becomes larger than the first pinch angle (A1) by applying a trigger in the fully folded state, the electronic device (100) can be unfolded so that the pinch angle (A) increases to the second pinch angle (A2) without additional external force.

[0314] The various embodiments of this document and the terms used therein are not intended to limit the technology described in this document to specific embodiments and should be understood to include various modifications, equivalents, and / or substitutions of such embodiments. In relation to the description of the drawings, similar reference numerals may be used for similar components. A singular expression may include a plural expression unless the context clearly indicates otherwise. In this document, expressions such as "A or B," "at least one of A and / or B," "A, B or C," or "at least one of A, B and / or C" may include all possible combinations of items listed together. Expressions such as "first," "second," "first," or "second" may modify the components, regardless of order or importance, and are used only to distinguish one component from another and do not limit the components. When it is mentioned that a certain (e.g., first) component is "(functionally or telecommunicationally) connected" or "connected" to another (e.g., second) component, said certain component may be directly connected to said other component or connected through another component (e.g., third component).

[0315] In this document, "adapted to or configured to" may be used interchangeably with, depending on the context, for example, hardware- or software-wise, "suitable for," "capable of," "modified to," "made to," "capable of," or "designed to." In some cases, the expression "device configured to" may mean that the device is "capable of" in conjunction with other devices or components. For example, the phrase "processor configured to perform A, B, and C" may refer to a dedicated processor for performing those operations (e.g., an embedded processor), or a general-purpose processor (e.g., a CPU or AP) capable of performing those operations by executing one or more programs stored in a memory device (e.g., memory).

[0316] As used in this document, the term “module” includes a unit composed of hardware, software, or firmware, and may be used interchangeably with terms such as logic, logic block, component, or circuit, for example. A “module” may be a component formed as a whole or a minimum unit or part thereof that performs one or more functions. A “module” may be implemented mechanically or electronically and may include, for example, an application-specific integrated circuit (ASIC) chip, field-programmable gate arrays (FPGAs), or programmable logic device, known or under development, that performs certain operations.

[0317] At least a portion of the device (e.g., modules or functions thereof) or method (e.g., operations) according to various embodiments may be implemented as instructions stored in a computer-readable storage medium (e.g., memory) in the form of program modules. When said instructions are executed by a processor (e.g., a processor), the processor may perform a function corresponding to said instructions. Computer-readable recording media may include a hard disk, a floppy disk, a magnetic medium (e.g., magnetic tape), an optical recording medium (e.g., CD-ROM, DVD), a magneto-optical medium (e.g., floptical disk), built-in memory, etc. Instructions may include code generated by a compiler or code that can be executed by an interpreter.

[0318] Each component (e.g., module or program module) according to various embodiments may be composed of a singular or multiple entities, and some of the aforementioned sub-components may be omitted or additional sub-components may be included. Generally or additionally, some components (e.g., module or program module) may be integrated into a single entity to perform the functions performed by each of the respective components prior to integration in the same or similar manner. The operations performed by the module, program module, or other components according to various embodiments may be executed sequentially, in parallel, iteratively, or heuristically, or at least some operations may be executed in a different order, omitted, or additional operations may be added.

Claims

Claim 1 An electronic device comprises a first housing (110), a second housing (120), and a hinge structure (200) connected to the first housing (110) and the second housing (120) such that the first housing (110) rotates around a first rotation axis (R1) parallel to the axial direction and the second housing (120) rotates around a second rotation axis (R2) parallel to the axial direction, wherein the hinge structure (200) comprises: a first rotation structure (210) connected to the first housing (110); a second rotation structure (220) connected to the second housing (120); a first arm shaft (241) parallel to the axial direction linked to the rotation of the first housing (110); a second arm shaft (242) parallel to the axial direction linked to the rotation of the second housing (120); a first arm cam (254) rotating together with the first arm shaft (241) and a second A first arm portion (250) comprising an arm cam (255), a first extension portion (253) coupled to the first rotating structure (210), a first coupling portion (251) connected from the first extension portion (253) in a direction perpendicular to the first arm axis (241) and coupled to the first arm axis (241), and a second coupling portion (252) spaced apart from the first coupling portion (251) in the axial direction and connected from the first extension portion (253) in a direction perpendicular to the first arm axis (241) and coupled to the first arm axis (241);A second arm member (260) comprising a third arm cam (264) and a fourth arm cam (265) that rotate together with the second arm shaft (242), a second extension part (263) coupled to the second rotating structure (220), a third coupling part (261) connected from the second extension part (263) in a direction perpendicular to the second arm shaft (242) and coupled to the second arm shaft (242), and a fourth coupling part (262) spaced apart from the third coupling part (261) in the axial direction and connected from the second extension part (263) in a direction perpendicular to the second arm shaft (242) and coupled to the second arm shaft (242); a first cam member (270) comprising a first moving cam (271) coupled to the first arm cam (254), and a second moving cam (272) coupled to the third arm cam (264); and the first A cam member (270) is configured to move in the axial direction along the first arm axis (241) and the second arm axis (242); a second cam member (280) comprising a third moving cam (281) coupled to the second arm cam (255) and a fourth moving cam (282) coupled to the fourth arm cam (265), wherein the second cam member (280) is configured to move in the axial direction along the first arm axis (241) and the second arm axis (242); a first elastic member (291) coupled to the first arm axis (241) and disposed between the first cam member (270) and the second cam member (280); and a second elastic member (292) coupled to the second arm axis (242) and disposed between the first cam member (270) and the second cam member (280);The electronic device comprises a free stop section defined between a fully folded state (Sf) and an unfolded state (Su), a first state (S1) defined between the free stop section and the fully folded state (Sf), and a second state (S2) defined between the free stop section and the fully folded state and being more unfolded than the first state (S1); and the hinge structure (200) is configured such that when the electronic device moves from the fully folded state (Sf) to the second state (S2), the first cam member (270) is fixed at a position specified in the axial direction and the second cam member (280) moves in the axial direction. Claim 2 An electronic device according to claim 1, wherein the hinge structure (200) is configured such that when the electronic device moves from the fully folded state (Sf) to the first state (S1), the second cam member (280) moves in a direction toward the first cam member (270) and the first elastic member (291) and the second elastic member (292) are compressed, and when the electronic device moves from the first state (S1) to the second state (S2), the second cam member (280) moves in a direction toward the first cam member (270) and the first elastic member (291) and the second elastic member (292) are tensioned. Claim 3 An electronic device according to claim 1, wherein each of the first elastic member (291) and the second elastic member (292) is configured to be compressed by a first displacement (ΔL1) from the fully folded state (Sf) to the first state (S1), and to be stretched by a second displacement (ΔL2) greater than the first displacement (ΔL1) from the first state (S1) to the second state (S2). Claim 4 An electronic device according to claim 3, wherein when the electronic device moves from the second state (S2) to the free stop section, the hinge structure (200) is configured such that the first cam member (270) and the second cam member (280) each move in a direction that brings them closer to each other, and the first elastic member (291) and the second elastic member (292) are compressed by a third displacement. Claim 5 An electronic device according to claim 4, wherein the third displacement is smaller than or substantially equal to the second displacement (ΔL2). Claim 6 An electronic device according to claim 3, wherein when the electronic device moves from the free stop section to the unfolded state (Su), the hinge structure (200) is configured such that the first cam member (270) and the second cam member (280) each move away from each other, and the first elastic member (291) and the second elastic member (292) are tensioned. Claim 7 In claim 1, each of the first cam member (270) and the second cam member (280) is fixed at a position specified in the axial direction so as to move closer to each other or maintain a constant distance from each other as the electronic device unfolds in the free stop section, and each of the first elastic member (291) and the second elastic member (292) is compressed or maintains a constant compressed state as the electronic device unfolds in the free stop section. Claim 8 In claim 1, each of the first female cam (254) and the third female cam (264) includes a first protrusion (254a), each of the second female cam (255) and the fourth female cam (265) includes a second protrusion (255a), each of the first moving cam (271) and the second moving cam (272) includes a third protrusion (271a) protruding toward the first female cam (254) and the third female cam (264), and each of the third moving cam (281) and the fourth moving cam (282) includes a fourth protrusion (281a) protruding toward the second female cam (255) and the fourth female cam (265) to a fourth height (h4), and a fifth protrusion smaller than the fourth height (h4) protruding toward the second female cam (255) and the fourth female cam (265). An electronic device comprising a fifth protrusion (281c) protruding at a height (h5) and positioned in the unfolding direction relative to the fourth protrusion (281a), wherein the second protrusion (255a) is configured to at least partially contact the fifth protrusion (281c) in the free stop section, at least partially contact the fourth protrusion (281a) in the first state (S1), and at least partially receive the fourth depression (281b) formed between the fourth protrusion (281a) and the fifth protrusion (281c) in the second state (S2). Claim 9 An electronic device according to claim 8, wherein the protruding surface of the fifth protrusion (281c) has a larger area than the protruding surface of the fourth protrusion (281a). Claim 10 An electronic device according to claim 8, wherein, in the fully folded state, the first protrusion (254a) is located in the third recess (271b) of each of the first moving cam (271) and the second moving cam (272), and the second protrusion (255a) is located on the inclined surface of the fourth protrusion (281a). Claim 11 In claim 8, when the electronic device moves from the fully folded state (Sf) to the second state (S2), the first protrusion (254a) is located in the third recess (271b) of each of the first moving cam (271) and the second moving cam (272), the second protrusion (255a) moves beyond the fourth protrusion (281a) into the fourth recess (281b) between the fourth protrusion (281a) and the fifth protrusion (281c), and the first moving cam (271) and the second moving cam (272) are fixed at a position specified in the axial direction. Claim 12 An electronic device according to claim 11, wherein when the electronic device moves from the fully folded state (Sf) to the first state (S1), the first protrusion (254a) is located at the third recess (271b), the second protrusion (255a) moves along the inclined surface of the fourth protrusion (281a) to the protruding surface of the fourth protrusion (281a), and the first elastic member (291) and the second elastic member (292) are compressed by the movement of the first cam member (270). Claim 13 In claim 11, when the electronic device moves from the first state (S1) to the second state (S2), the first protrusion (254a) is located at the third depression (271b), the second protrusion (255a) moves along an inclined surface from the protruding surface of the fourth protrusion (281a) to the fourth depression (281b), and the first elastic member (291) and the second elastic member (292) are tensioned by the movement of the first cam member (270). Claim 14 In claim 8, when the electronic device moves from the second state (S2) to the free stop section, the first protrusion (254a) moves along the inclined surface of the third protrusion (271a) to the protruding surface of the third protrusion (271a), the second protrusion (255a) moves along the inclined surface of the fifth protrusion (281c) to the protruding surface of the fifth protrusion (281c), and the first elastic member (291) and the second elastic member (292) are compressed by the movement of the first cam member (270) and the second cam member (280), respectively. Claim 15 In claim 8, when the electronic device moves from the free stop section to the unfolded state (Su), the first protrusion (254a) moves along the inclined surface of the third protrusion (271a), the second protrusion (255a) moves along the inclined surface of the fifth protrusion (281c), and the first elastic member (291) and the second elastic member (292) are tensioned by the movement of the first cam member (270) and the second cam member (280), respectively. Claim 16 An electronic device comprises a first housing (110), a second housing (120), a display (140) extending to a first surface (141) of the first housing (110) and a second surface (142) of the second housing (120), and a hinge structure (200) connected to the first housing (110) and the second housing (120), wherein the first housing (110) rotates about a first rotation axis (R1) and the second housing (120) rotates about a second rotation axis (R2) parallel to the first rotation axis (R1), so that the first surface (141) and the second surface (142) form a predetermined interlocking angle (A), and the electronic device has an unfolded state (Su) in which the first surface (141) and the second surface (142) form a substantially continuous plane, and an edge (P1) of the first housing (110) and the second The first housing (110) and the second housing (120) are in a fully folded state (Sf) in which they are rotated so that the edge (P2) of the housing (120) contacts at least partially, and the hinge structure (200) comprises: a first rotational structure (210) connected to the first housing (110); a second rotational structure (220) connected to the second housing (120); and a first arm shaft (241) coupled to the rotation of the first housing (110). A first arm portion (250) comprising a first arm cam (254) and a second arm cam (255) that rotate together with the first arm shaft (241), a first extension portion (253) coupled to the first rotating structure (210), a first coupling portion (251) connected from the first extension portion (253) in a direction perpendicular to the first arm shaft (241) and coupled to the first arm shaft (241), and a second coupling portion (252) that is spaced apart in the axial direction from the first coupling portion (251) and connected from the first extension portion (253) in a direction perpendicular to the first arm shaft (241) and coupled to the first arm shaft (241);A first elastic member (291) disposed on the first arm shaft (241) to provide elastic force in the extension direction of the first arm shaft (241); a second arm shaft (242) coupled to the rotation of the second housing (120); A second arm portion (260) comprising a third arm cam (264) and a fourth arm cam (265) that rotate together with the second arm shaft (242), a second extension portion (263) coupled to the second rotating structure (220), a third coupling portion (261) connected from the second extension portion (263) in a direction perpendicular to the second arm shaft (242) and coupled to the second arm shaft (242), and a fourth coupling portion (262) spaced apart from the third coupling portion (261) in the axial direction and connected from the second extension portion (263) in a direction perpendicular to the second arm shaft (242) and coupled to the second arm shaft (242); and a second elastic member (292) disposed on the second arm shaft (242) to provide elastic force in the extension direction of the second arm shaft (242), and the hinge structure (200) comprises a folding detent section defined from the fully folded state (Sf) to a first state (S1) having a first pinch angle (A1), wherein each of the first elastic member (291) and the second elastic member (292) is compressed by a first displacement (ΔL1) as the pinch angle (A) increases in the folding detent section; An automatic unfolding section defined from the first state (S1) to a second state (S2) having a second interlocking angle (A2) greater than the first interlocking angle (A1), wherein each of the first elastic member (291) and the second elastic member (292) is stretched by a second displacement (ΔL2) as the interlocking angle (A) increases in the automatic unfolding section;An electronic device comprising: a free stop section defined from a third-1 state (S31) having a third-1 interlocking angle (A31) greater than the second interlocking angle (A2) to a third-2 state (S32) having a third-2 interlocking angle (A32) greater than the third-1 interlocking angle (A31); wherein each of the first elastic member (291) and the second elastic member (292) maintains a constant compression state independently of the interlocking angle (A) in the free stop section, or is compressed as the interlocking angle (A) increases; an unfolding detent section defined between the third-2 state (S32) and the unfolded state (Su); wherein each of the first elastic member (291) and the second elastic member (292) is tensioned by a third displacement (ΔL3) as the interlocking angle (A) increases in the unfolding detent section; Claim 17 An electronic device according to claim 16, wherein the magnitude of the first displacement (ΔL1) is smaller than the magnitude of the second displacement (ΔL2). Claim 18 An electronic device according to claim 16, wherein the magnitude of the third displacement (ΔL3) is substantially the same as the magnitude of the second displacement (ΔL2). Claim 19 An electronic device according to claim 16, wherein the magnitude of the first slope (g1), which is the ratio of the second displacement (ΔL2) to the increase (A2-A1) of the interlocking angle (A) in the automatic unfolding section, is larger than the magnitude of the second slope (g2), which is the ratio of the third displacement (ΔL3) to the increase (A) of the interlocking angle in the unfolding detent section. Claim 20 In claim 16, the hinge structure (200) is configured to provide torque to each of the first arm shaft (241) and the second arm shaft (242) in a direction in which the pinch angle (A) decreases in the folding detent section, and to provide torque to each of the first arm shaft (241) and the second arm shaft (242) in a direction in which the pinch angle (A) increases in the automatic unfolding section and the unfolding detent section, and when the pinch angle (A) becomes larger than the first pinch angle (A1) by applying a trigger in the fully folded state, the electronic device unfolds such that the pinch angle (A) increases to the second pinch angle (A2) without additional external force.

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