# US 12,009,275 B2 · Heat transfer device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,009,275 B2 - Document ID: US12009275B2 - Status: Granted - Kind: B2 - Application number: 17/381,259 - Filed: 2021-07-21 - Published: 2022-01-27 - Granted: 2024-06-11 - Earliest claimed: 2020-07-27 - Assignees: ASUSTeK COMPUTER INC. - Applicants: ASUSTeK COMPUTER INC. - Inventors: Hsin-Chen Lin; Ing-Jer Chiou - Web page: https://patentgrep.com/patent/US12009275B2 ## CPC - H10W 40/226: {characterised by projecting parts, e.g. fins to increase surface area (leadframes for cooling H10W70/461)} - H05K 7/20454: {with a conformable or flexible structure compensating for irregularities, e.g. cushion bags, thermal paste} - F28D 9/0062: {the conduits for one heat-exchange medium being formed by spaced plates with inserted elements (F28D9/0012, F28D9/0025, F28D9/0081, F28D9/04 take precedence)} - F28D 2021/0029: {Heat sinks} - F28F 2255/02: Flexible elements - F28F 2280/10: Movable elements, e.g. being pivotable - H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10 - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS - F28D: HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT (fluid heaters having heat generating means and heat transferring means F24H; furnaces F27; details of heat-exchange apparatus of general) - F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16) ## Abstract A heat transfer device is provided. The heat transfer device includes a first heat conduction sheet and a second heat conduction sheet. The first heat conduction sheet includes two first rigid parts and a first bendable part connected between the two first rigid parts. The second heat conduction sheet includes two second rigid parts and a second bendable part connected between the two second rigid parts. The two first rigid parts are thermally coupled to the two second rigid parts, respectively. The first bendable portion includes a nonlinear section. ## Claims ### Claim 1 A heat transfer device, comprising: a first heat conduction sheet, including two first rigid parts and a first bendable part, and two ends of the first bendable part are respectively and directly connected to the two first rigid parts; and a second heat conduction sheet, including two second rigid parts and a second bendable part, and two ends of the second bendable part are respectively and directly connected to the two second rigid parts; wherein the two first rigid parts of the first heat conduction sheet are thermally coupled to the two second rigid parts of the second heat conduction sheet, respectively, and the first bendable part includes at least one first nonlinear section, such that the first bendable part is longer than the second bendable part, wherein the at least one first nonlinear section forms undulation when the heat transfer device is at an unfolded state, and the undulation of the at least one first nonlinear section disappears when the heat transfer device is at a folded state. ### Claim 2 (depends on 1) The heat transfer device according to claim 1, wherein the at least one first nonlinear section extends to form a recess, and the recess faces a direction away from the second heat conduction sheet. ### Claim 3 (depends on 2) The heat transfer device according to claim 2, wherein when the heat transfer device is at an unfolded state, the two first rigid parts are at a reference plane, and the at least one first nonlinear section is between the reference plane and the second heat conduction sheet. ### Claim 4 (depends on 2) The heat transfer device according to claim 2, further comprising: a third heat conduction sheet, including two third rigid parts and a third bendable part, and the third bendable part is connected between the two third rigid parts; wherein the first heat conduction sheet is between the second heat conduction sheet and the third heat conduction sheet, the two first rigid parts are thermally coupled to the two third rigid parts, the third bendable part includes at least one third nonlinear section, and the at least one third nonlinear section is in the recess. ### Claim 5 (depends on 4) The heat transfer device according to claim 4, wherein a number of the at least one third nonlinear section is greater than a number of the at least one first nonlinear section. ### Claim 6 (depends on 4) The heat transfer device according to claim 4, wherein the at least one first nonlinear section includes a first ladder structure, the at least one third nonlinear section includes a plurality of third ladder structures, a maximum width of the third ladder structure is smaller than the maximum width of the first ladder structure, and the third ladder structures is accommodated in the first ladder structure. ### Claim 7 (depends on 1) The heat transfer device according to claim 1, further comprising: a third heat conduction sheet connected between the first heat conduction sheet and the second heat conduction sheet, the third heat conduction sheet further includes a disconnection part, the disconnection part is between the first bendable part and the second bendable part. ### Claim 8 (depends on 7) The heat transfer device according to claim 7, further comprising: a fourth heat conduction sheet, located at a side of the first heat conduction sheet away from the third heat conduction sheet, the fourth heat conduction sheet is thermally coupled to the two first rigid parts, the fourth heat conduction sheet includes a plurality of fourth nonlinear sections, the at least one first nonlinear section extends to form a recess to accommodate the fourth nonlinear sections. ### Claim 9 (depends on 1) The heat transfer device according to claim 1, further comprising: a thermal conductor fixedly connected between one of the two first rigid parts and one of the two second rigid parts. ### Claim 10 (depends on 1) The heat transfer device according to claim 1, wherein one of the two first rigid parts and one of the two second rigid parts soldered together. ### Claim 11 A heat transfer device, comprising: a first heat conduction sheet, including two first rigid parts and a first bendable part, the first bendable part is connected between the two first rigid parts; and a second heat conduction sheet, including two second rigid parts and a second bendable part, the second bendable part is connected between the two second rigid parts, a third heat conduction sheet connected between the first heat conduction sheet and the second heat conduction sheet, the third heat conduction sheet further includes a disconnection part, the disconnection part is between the first bendable part and the second bendable part, wherein the two first rigid parts of the first heat conduction sheet are thermally coupled to the two second rigid parts of the second heat conduction sheet, respectively, and the first bendable part includes at least one first nonlinear section. ### Claim 12 A heat transfer device, comprising: a first heat conduction sheet, including two first rigid parts and a first bendable part, the first bendable part is connected between the two first rigid parts; and a second heat conduction sheet, including two second rigid parts and a second bendable part, the second bendable part is connected between the two second rigid parts; wherein the two first rigid parts of the first heat conduction sheet are thermally coupled to the two second rigid parts of the second heat conduction sheet, respectively, and the first bendable part includes at least one first nonlinear section, such that the first bendable part is longer than the second bendable part, wherein the at least one first nonlinear section is detached from a reference plane extended along the first heat conduction sheet, and wherein the at least one first nonlinear section includes a ladder structure in a shape of isosceles trapezoid, wherein the at least one first nonlinear section forms undulation when the heat transfer device is at an unfolded state, and the undulation of the at least one first nonlinear section disappears when the heat transfer device is at a folded state.