# US 10,119,770 B2 · Planar heat pipe

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,119,770 B2
- Document ID: US10119770B2
- Status: Granted
- Kind: B2
- Application number: 15/507,027
- Filed: 2015-08-17
- Published: 2017-08-31
- Granted: 2018-11-06
- Earliest claimed: 2014-08-29
- Assignees: Furukawa Electric Co., Ltd.
- Applicants: Furukawa Electric Co., Ltd.
- Inventors: Hirofumi Aoki; Hiroshi Sakai; Tatsuro Miura; Yoshikatsu Inagaki
- Web page: https://patentgrep.com/patent/US10119770B2

## CPC

- F28F 1/04: polygonal, e.g. rectangular {(F28F1/022 takes precedence)}
- B23K 11/02: Pressure butt welding
- B23K 11/115: {by means of two electrodes placed opposite one another on both sides of the welded parts}
- B23K 26/21: by welding
- F28D 15/04: with tubes having a capillary structure
- F28F 2245/00: Coatings; Surface treatments
- F28F 2255/00: Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes
- F28F 2275/06: by welding
- F28F 2275/067: by laser welding
- H10W 40/73: for cooling by change of state
- F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16)
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- 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)
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10

## Abstract

A planar heat pipe includes a container having a hollow portion provided at a central portion thereof with two opposing plate-shaped bodies, and a working fluid enclosed in the hollow portion. The hollow portion is provided with a wick structure. At least one of the plate-shaped bodies is a composite member of two or more types of metal members that are laminated and integrated. A metal member of the composite member forming a layer that contacts the hollow portion has a thermal conductivity of greater than or equal to 200 W/m·K and a metal member of the composite member forming a layer that contacts an exterior has a thermal conductivity of less than or equal to 100 W/m·K, a peripheral portion of the hollow portion being sealed.

## Claims

### Claim 1

A planar heat pipe comprising:
a container having a hollow portion provided at a central portion thereof with two opposing plate-shaped bodies; and
a working fluid enclosed in the hollow portion,
the hollow portion being provided with a wick structure,
at least one of the plate-shaped bodies being a composite member of two or more types of metal members that are laminated and integrated,
a metal member of the composite member forming a layer that contacts the hollow portion having a thermal conductivity of greater than or equal to 200 W/m·K and a metal member of the composite member forming a layer that contacts an exterior having a thermal conductivity of less than or equal to 100 W/m·K, a peripheral portion of the hollow portion being sealed.

### Claim 2 (depends on 1)

The planar heat pipe according to claim 1, wherein the peripheral portion of the hollow portion is sealed by laser beam welding.

### Claim 3 (depends on 1)

The planar heat pipe according to claim 1, wherein the peripheral portion of the hollow portion is sealed by resistance welding.

### Claim 4 (depends on 1)

The planar heat pipe according to claim 1, wherein the composite member is a cladded material or a plated material.

### Claim 5 (depends on 1)

The planar heat pipe according to claim 1, wherein the metal member forming the layer that contacts the hollow portion is of copper, and the metal member forming the layer that contacts the exterior is of stainless steel.

### Claim 6 (depends on 1)

The planar heat pipe according to claim 1, wherein the metal member forming the layer that contacts the hollow portion has a layer thickness of less than or equal to half a thickness of the composite member.

### Claim 7

A heat sink comprising a planar heat pipe,
the planar heat pipe including:
a container having a hollow portion provided at a central portion thereof with two opposing plate-shaped bodies; and
a working fluid enclosed in the hollow portion,
the hollow portion being provided with a wick structure,
at least one of the plate-shaped bodies being a composite member of two or more types of metal members that are laminated and integrated,
a metal member of the composite member forming a layer that contacts the hollow portion having a thermal conductivity of greater than or equal to 200 W/m·K and a metal member of the composite member forming a layer that contacts an exterior having a thermal conductivity of less than or equal to 100 W/m·K, a peripheral portion of the hollow portion being sealed.