# US 2025/0168262 A1 · Foldable electronic device and shaft cover assembly > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0168262 A1 - Document ID: US20250168262A1 - Status: Published application - Kind: A1 - Application number: 18/839,372 - Filed: 2023-04-11 - Published: 2025-05-22 - Earliest claimed: 2022-07-22 - Assignees: Honor Device Co., Ltd. - Applicants: Honor Device Co., Ltd. - Inventors: Wenhao Wang; Yihe Zhang; Xiujuan Yang; Ye Han - Web page: https://patentgrep.com/patent/US20250168262A1 ## CPC - F16C 11/04: Pivotal connections (hinges for doors, windows or wings E05D) - H04M 1/0216: {Foldable in one direction, i.e. using a one degree of freedom hinge} - G06F 1/1616: {with folding flat displays, e.g. laptop computers or notebooks having a clamshell configuration, with body parts pivoting to an open position around an axis parallel to the plane they define in closed position} - G06F 1/1652: {the display being flexible, e.g. mimicking a sheet of paper, or rollable} - G06F 1/1681: {Details related solely to hinges (hinge details related to the transmission of signals or power are classified in G06F1/1683)} - G06F 1/1683: {for the transmission of signal or power between the different housings, e.g. details of wired or wireless communication, passage of cabling} - H04M 1/022: {The hinge comprising two parallel pivoting axes} - H05K 1/189: characterised by the use of flexible or folded printed circuits - H04M 1/0268: {including a flexible display panel} - H04M 1/0277: {for a printed circuit board assembly} - F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS - H04M: TELEPHONIC COMMUNICATION (circuits for controlling other apparatus via a telephone cable and not involving telephone switching apparatus G08) - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS ## Abstract Embodiments of this application provide a foldable electronic device and a shaft cover assembly. A first middle frame part and a second middle frame part in the foldable electronic device are rotatably connected to each other by using a rotating shaft assembly. The foldable electronic device further includes a flexible circuit board and at least one shaft cover assembly. The shaft cover assembly is rotatably connected to the rotating shaft assembly. The flexible circuit board is fixedly connected to the shaft cover assembly. In a process in which the first middle frame part and the second middle frame part are folded or unfolded relative to each other, the shaft cover assembly moves back and forth relative to the rotating shaft assembly in a thickness direction of the foldable electronic device. ## Claims ### Claim 1 A foldable electronic device, comprising at least the following: a first middle frame part, a second middle frame part, and a rotating shaft assembly, wherein the first middle frame part and the second middle frame part are rotatably connected to each other by using the rotating shaft assembly; the foldable electronic device further comprises a flexible circuit board and at least one shaft cover assembly, and the shaft cover assembly is rotatably connected to the rotating shaft assembly; and the flexible circuit board is fixedly connected to the shaft cover assembly, and in a process in which the first middle frame part and the second middle frame part are folded or unfolded relative to each other, the shaft cover assembly moves back and forth relative to the rotating shaft assembly in a thickness direction of the foldable electronic device. ### Claim 2 (depends on 1) The foldable electronic device according to claim 1, further comprising a first circuit board and a second circuit board, wherein the first circuit board is located on the first middle frame part, the second circuit board is located on the second middle frame part, one end of the flexible circuit board is connected to the first circuit board, and the other end of the flexible circuit board is connected to the second circuit board after passing through the rotating shaft assembly. ### Claim 3 (depends on 1) The foldable electronic device according to claim 1, wherein the rotating shaft assembly comprises a rotating shaft, a first swing arm, and a second swing arm; and the first swing arm and the second swing arm are separately rotatably connected to the rotating shaft, the first swing arm is fixedly connected to the first middle frame part, and the second swing arm is fixedly connected to the second middle frame part. ### Claim 4 (depends on 3) The foldable electronic device according to claim 3, wherein each shaft cover assembly comprises a shaft cover, a first fastener, and two linkage members; two sliding grooves are disposed on the shaft cover, and one end of each linkage member is located in the sliding groove and is slidably connected to the sliding groove; two rotating cavities are disposed on the first fastener, and the other end of each linkage member is located in the rotating cavity and is rotatably connected to the rotating cavity; and the flexible circuit board is fixedly connected to the shaft cover, the first fastener is fixedly connected to the rotating shaft, one of the two linkage members is fixedly connected to the first swing arm, and the other of the two linkage members is fixedly connected to the second swing arm. ### Claim 5 (depends on 4) The foldable electronic device according to claim 4, wherein the shaft cover comprises a shaft cover body and a second fastener fixedly connected to the shaft cover body; and the flexible circuit board is fixedly connected to the shaft cover body, and the sliding groove is located on the second fastener. ### Claim 6 (depends on 5) The foldable electronic device according to claim 5, wherein the flexible circuit board is fixedly connected to a side that is of the shaft cover body and that faces away from the rotating shaft assembly. ### Claim 7 (depends on 4) The foldable electronic device according to claim 4, wherein the linkage member comprises a rotating part and a sliding part connected to the rotating part; the rotating part is located in the rotating cavity and is rotatably connected to the rotating cavity; and the sliding part is located in the sliding groove and is slidably connected to the sliding groove. ### Claim 8 (depends on 4) The foldable electronic device according to claim 4, wherein the sliding groove is a D-shaped groove. ### Claim 9 (depends on 4) The foldable electronic device according to claim 4, wherein a central axis of the rotating part in an axial direction of the linkage member does not coincide with a central axis of the sliding part in the axial direction of the linkage member. ### Claim 10 (depends on 9) The foldable electronic device according to claim 9, wherein a size of the rotating part in a radial direction of the linkage member is less than a size of the sliding part in the radial direction of the linkage member. ### Claim 11 (depends on 4) The foldable electronic device according to claim 4, wherein in a process in which the first swing arm and the second swing arm are folded relative to each other, the shaft cover assembly moves towards the rotating shaft in the thickness direction of the foldable electronic device; and in a process in which the first swing arm and the second swing arm are unfolded relative to each other, the shaft cover assembly moves away from the rotating shaft in the thickness direction of the foldable electronic device. ### Claim 12 (depends on 11) The foldable electronic device according to claim 11, wherein when the first swing arm and the second swing arm are unfolded to a same plane relative to each other, a distance between the shaft cover assembly and the rotating shaft is a first preset distance; when the first swing arm and the second swing arm are folded to a same plane relative to each other, the distance between the shaft cover assembly and the rotating shaft is a second preset distance; and a difference between the first preset distance and the second preset distance is 1 mm-1.7 mm. ### Claim 13 A shaft cover assembly, wherein comprises; a shaft cover, a first fastener, and two linkage members; two sliding grooves are disposed on the shaft cover, and one end of each linkage member is located in the sliding groove and is slidably connected to the sliding groove; two rotating cavities are disposed on the first fastener, and the other end of each linkage member is located in the rotating cavity and is rotatably connected to the rotating cavity; and the flexible circuit board is fixedly connected to the shaft cover, the first fastener is fixedly connected to a rotating shaft of the rotating shaft assembly, one of the two linkage members is fixedly connected to a first swing arm of the rotating shaft assembly, and the other of the two linkage members is fixedly connected to a second swing arm of the rotating shaft assembly; the shaft cover comprises a shaft cover body and a second fastener fixedly connected to the shaft cover body; the flexible circuit board of a foldable electronic device is fixedly connected to the shaft cover body, and the sliding groove is located on the second fastener; and the flexible circuit board is fixedly connected to a side that is of the shaft cover body of the foldable electronic device and that faces away from the rotating shaft assembly; and the linkage member comprises a rotating part and a sliding part connected to the rotating part; the rotating part is located in the rotating cavity and is rotatably connected to the rotating cavity; the sliding part is located in the sliding groove and is slidably connected to the sliding groove. ### Claim at position 14 -16. (canceled) ### Claim 17 (depends on 2) The foldable electronic device according to claim 2, wherein the rotating shaft assembly comprises a rotating shaft, a first swing arm, and a second swing arm; and the first swing arm and the second swing arm are separately rotatably connected to the rotating shaft, the first swing arm is fixedly connected to the first middle frame part, and the second swing arm is fixedly connected to the second middle frame part. ### Claim 18 (depends on 17) The foldable electronic device according to claim 17, wherein each shaft cover assembly comprises a shaft cover, a first fastener, and two linkage members; two sliding grooves are disposed on the shaft cover, and one end of each linkage member is located in the sliding groove and is slidably connected to the sliding groove; two rotating cavities are disposed on the first fastener, and the other end of each linkage member is located in the rotating cavity and is rotatably connected to the rotating cavity; and the flexible circuit board is fixedly connected to the shaft cover, the first fastener is fixedly connected to the rotating shaft, one of the two linkage members is fixedly connected to the first swing arm, and the other of the two linkage members is fixedly connected to the second swing arm. ### Claim 19 (depends on 18) The foldable electronic device according to claim 18, wherein the shaft cover comprises a shaft cover body and a second fastener fixedly connected to the shaft cover body; and the flexible circuit board is fixedly connected to the shaft cover body, and the sliding groove is located on the second fastener. ### Claim 20 (depends on 19) The foldable electronic device according to claim 19, wherein the flexible circuit board is fixedly connected to a side that is of the shaft cover body and that faces away from the rotating shaft assembly. ### Claim 21 (depends on 17) The foldable electronic device according to claim 17, wherein the linkage member comprises a rotating part and a sliding part connected to the rotating part; the rotating part is located in the rotating cavity and is rotatably connected to the rotating cavity; and the sliding part is located in the sliding groove and is slidably connected to the sliding groove. ### Claim 22 (depends on 17) The foldable electronic device according to claim 17, wherein a central axis of the rotating part in an axial direction of the linkage member does not coincide with a central axis of the sliding part in the axial direction of the linkage member. ### Claim 23 (depends on 22) The foldable electronic device according to claim 22, wherein a size of the rotating part in a radial direction of the linkage member is less than a size of the sliding part in the radial direction of the linkage member.