# US 11,445,636 B2 · Vapor chamber, heatsink device, and electronic device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,445,636 B2 - Document ID: US11445636B2 - Status: Granted - Kind: B2 - Application number: 16/670,204 - Filed: 2019-10-31 - Published: 2021-05-06 - Granted: 2022-09-13 - Earliest claimed: 2019-10-31 - Assignees: Murata Manufacturing Co., Ltd.; Kelvin Thermal Technologies, Inc. - Applicants: Murata Manufacturing Co., Ltd.; Kelvin Thermal Technologies, Inc. - Inventors: Takuo Wakaoka; Tatsuhiro Numoto; Keijiro Kojima; Ryan J. Lewis - Web page: https://patentgrep.com/patent/US11445636B2 ## CPC - H05K 7/20336: {Heat pipes, e.g. wicks or capillary pumps} - F28D 15/046: {characterised by the material or the construction of the capillary structure} - F28F 3/12: Elements constructed in the shape of a hollow panel, e.g. with channels {(F28D1/02, F28D1/03 take precedence)} - G06F 1/203: {for portable computers, e.g. for laptops} - F28D 15/0233: {the conduits having a particular shape, e.g. non-circular cross-section, annular (F28D15/0241, F28D15/0266 take precedence)} - F28D 15/04: with tubes having a capillary structure - F28D 2021/0029: {Heat sinks} - H10W 40/73: for cooling by change of state - 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) - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10 ## Abstract A vapor chamber that includes a housing including a first sheet and a second sheet opposing each other and joined together at outer edges of the first sheet and the second sheet and defining a hollow vapor flow pass therein; a working fluid in the housing; a first wick in contact with the vapor flow pass; and a second wick between the first wick and an inner wall surface of at least one of the first sheet and the second sheet. The first wick defines a first liquid flow pass, the second wick defines a second liquid flow pass, and a first average diameter of the first liquid flow pass is smaller than or equal to 75% of a second average diameter of the second liquid flow pass. ## Claims ### Claim 1 A vapor chamber, comprising: a housing including a first sheet and a second sheet opposing each other and joined together at outer edges of the first sheet and the second sheet and defining a hollow vapor flow pass therein; a working fluid in the housing; a first wick in contact with the vapor flow pass; and a second wick between the first wick and an inner wall surface of at least one of the first sheet and the second sheet, wherein the first wick defines a first liquid flow pass that extends through the first wick in a thickness direction in which the first sheet and the second sheet oppose each other, wherein the second wick defines a second liquid flow pass that extends in a plane direction of the second wick that is perpendicular to the thickness direction, and wherein a first average diameter of the first liquid flow pass when viewed in the thickness direction is smaller than or equal to 50% of a second average diameter of the second liquid flow pass when viewed in the plane direction. ### Claim 2 (depends on 1) The vapor chamber according to claim 1, wherein, when viewed in the plane direction, a first hydraulic diameter of the vapor flow pass is larger than a second hydraulic diameter of the second liquid flow pass. ### Claim 3 (depends on 1) The vapor chamber according to claim 1, wherein a maximum diameter of the first liquid flow pass when viewed in the thickness direction is 1 mm or less, and wherein a maximum diameter of the second liquid flow pass when viewed in the plane direction is 1 mm or less. ### Claim 4 (depends on 1) The vapor chamber according to claim 1, wherein a diameter of the first liquid flow pass decreases in a direction from the second liquid flow pass toward the vapor flow pass. ### Claim 5 (depends on 1) The vapor chamber according to claim 1, wherein at least a part of the first wick protrudes into the second liquid flow pass. ### Claim 6 (depends on 1) The vapor chamber according to claim 1, further comprising one or more struts between the first sheet and the second sheet and which also define the hollow vapor flow pass within the housing. ### Claim 7 (depends on 1) The vapor chamber according to claim 1, wherein, when viewed in the thickness direction, an outer edge of the first wick is arranged so as to enclose a heating element that is to be disposed on an outer wall surface of the first sheet or the second sheet, and the first wick has an area that is greater than or equal to twice an area of the heating element. ### Claim 8 (depends on 1) The vapor chamber according to claim 1, wherein, when viewed in the thickness direction, a first area of the first wick is smaller than a second area of the second wick. ### Claim 9 (depends on 1) The vapor chamber according to claim 1, wherein the first wick comprises a mesh and the second wick comprises protrusions or grooves. ### Claim 10 A vapor chamber, comprising: a housing including a first sheet and a second sheet opposing each other and joined together at outer edges of the first sheet and the second sheet and defining a hollow vapor flow pass therein; a working fluid in the housing; a first wick in contact with the vapor flow pass; and a second wick between the first wick and an inner wall surface of at least one of the first sheet and the second sheet, wherein the first wick defines a first liquid flow pass that extends through the first wick in a thickness direction in which the first sheet and the second sheet oppose each other, wherein the second wick defines a second liquid flow pass that extends in a plane direction of the second wick that is perpendicular to the thickness direction, wherein a first average diameter of the first liquid flow pass when viewed in the thickness direction is smaller than or equal to 75% of a second average diameter of the second liquid flow pass when viewed in the plane direction, and wherein the second wick is disposed on the inner wall surface of the first sheet; and the vapor chamber further comprises: a third wick in contact with the vapor flow pass; and a fourth wick between the third wick and an inner wall surface of the second sheet. ### Claim 11 (depends on 10) The vapor chamber according to claim 10, wherein the third wick defines a third liquid flow pass that extends through the third wick in a thickness direction in which the first sheet and the second sheet oppose each other, wherein the fourth wick defines a fourth liquid flow pass that extends in a plane direction of the fourth wick that is perpendicular to the thickness direction in which the first sheet and the second sheet oppose each other, and wherein a third average diameter of the third liquid flow pass when viewed in the thickness direction in which the first sheet and the second sheet oppose each other is smaller than or equal to 75% of a fourth average diameter of the fourth liquid flow pass when viewed in the plane direction of the fourth wick. ### Claim 12 (depends on 11) The vapor chamber according to claim 11, wherein, when viewed in the plane direction of the fourth wick, a first hydraulic diameter of the vapor flow pass is larger than a second hydraulic diameter of the fourth liquid flow pass. ### Claim 13 (depends on 11) The vapor chamber according to claim 11, wherein a maximum diameter of the third liquid flow pass when viewed in the thickness direction in which the first sheet and the second sheet oppose each other is 1 mm or less, and wherein a maximum diameter of the fourth liquid flow pass when viewed in the plane direction of the fourth wick is 1 mm or less. ### Claim 14 (depends on 11) The vapor chamber according to claim 11, wherein a first average diameter of the third liquid flow pass when viewed in the thickness direction in which the first sheet and the second sheet oppose each other is 50% or less of a second average diameter of the second liquid flow pass when viewed in the plane direction of the fourth wick. ### Claim 15 (depends on 10) The vapor chamber according to claim 10, wherein a diameter of the third liquid flow pass decreases in a direction from the fourth liquid flow pass toward the vapor flow pass. ### Claim 16 (depends on 10) The vapor chamber according to claim 10, wherein at least a part of the third wick protrudes into the fourth liquid flow pass. ### Claim 17 (depends on 10) The vapor chamber according to claim 10, further comprising one or more struts between the first wick and the third wick, and which also define the hollow vapor flow pass within the housing. ### Claim 18 (depends on 1) A heatsink device, comprising: a heatsink; and the vapor chamber according to claim 1 mounted on the heatsink. ### Claim 19 (depends on 1) An electronic device, comprising: a heat source; and the vapor chamber according to claim 1 arranged so as to thermally dissipate heat from the heat source.