VAPOR CHAMBER

• US 20090294104A1
• Filed: 05/28/2008
• Published: 12/03/2009
• Est. Priority Date: 05/08/2008
• Status: Active Grant

• Current Assignee: CPUMate Incorporated, Golden Sun News Techniques Company Limited
• Original Assignee: CPUMate Incorporated, Golden Sun News Techniques Company Limited
• Inventors: Huang, Ju-Tsu, Liu, Wen-Jung, Lin, Chen-Hsiang, LIN, Kuo-Len, Cheng, Chih-Hung
• Granted Patent: US 7,913,748 B2
• Time in Patent Office: Days
• US Class Current: 165/104.26
• CPC Class Codes: F28D 15/0233 the conduits having a particular shape, e.g. non-circular cross-section, annular F28D15/0241, F28D15/0266 take precedence
• CPC Class Codes: F28D 15/046 characterised by the material or the construction of the capillary structure
• CPC Class Codes: F28D 2021/0029 Heat sinks
• CPC Class Codes: H01L 23/427 Cooling by change of state, e.g. use of heat pipes by liquefied gas H01L23/445
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00

Abstract

A vapor chamber includes a plate and a wick structure. The plate is provided therein with a working fluid, and the plate has a heated end and a condensed end. The wick structure comprises a first wick portion adhered to be opposite to the heated end, a second wick portion overlapping on the first wick portion, and a third wick portion adhered on the rest portion of a chamber. The aperture diameter of the first wick portion is larger than that of the second wick portion, or the aperture density of the first wick portion is smaller than that of the second wick portion. Therefore, the amount of working fluid attached to the second wick portion is smaller than of the first wick portion. As a result, after heated, the working fluid attached to the second wick portion will be vaporized more quickly, thereby increasing the efficiency of heat transfer and improving the heat-dissipating effect.

Claims

1. A vapor chamber, comprising:

a plate with an interior hollowed and having a chamber, the chamber being provided therein with working fluid, one surface of the plate being used as a heated end, the other opposite surface of the plate being used as a condensed end; and

a wick structure adhered on inner wall surfaces of the chamber and comprising a first wick portion adhered to the plate opposite to the heated end, a second wick portion overlapping on the first wick portion, and a third wick portion adhered on remaining inner wall surfaces of the chamber, the third wick portion being opposite to the condensed end being separated from the second wick portion by the chamber;

wherein an aperture diameter of the first wick portion is larger than that of the second wick portion.

2. The vapor chamber according to claim 1, wherein the plate includes a base and a top cover, and the base and the top cover are connected to each other to form the chamber.

3. The vapor chamber according to claim 2, wherein a lower surface of the base is the heated end, and an upper surface of the top cover is the condensed end.

4. The vapor chamber according to claim 1, wherein the first and second wick portions are woven meshes, and the first wick portion is more loosely than the second wick portion.

5. The vapor chamber according to claim 1, wherein the first and second wick portions are made of sintering powder, and a powder size of the first wick portion is larger than that of the second wick portion.

6. The vapor chamber according to claim 1, wherein the aperture diameter of the first wick portion is smaller than that of the third wick portion.

7. The vapor chamber according to claim 6, wherein the first and third wick portions are woven meshes, and the first wick portion is more densely than the third wick portion.

8. The vapor chamber according to claim 6, wherein the first and third wick portions are made of sintering powder, and a particle size of the first wick portion is smaller than that of the third wick portion.

9. A vapor chamber, comprising:

a plate with an interior hollowed and having a chamber, the chamber being provided therein with working fluid, one surface of the plate being used as a heated end, the other opposite surface of the plate being used as a condensed end; and

a wick structure adhered on inner wall surfaces of the chamber and comprising a first wick portion adhered to the plate opposite to the heated end, a second wick portion overlapping on the first wick portion, and a third wick portion adhered on remaining inner wall surfaces of the chamber, the third wick portion being opposite to the condensed end being separated from the second wick portion by the chamber;

wherein an aperture density of the first wick portion is smaller than that of the second wick portion.

10. The vapor chamber according to claim 9, wherein the plate includes a base and a top cover, and the base and the top cover are connected to each other to form the chamber.

11. The vapor chamber according to claim 10, wherein a lower surface of the base is the heated end, and a upper surface of the top cover is the condensed end.

12. The vapor chamber according to claim 9, wherein the first and second wick portions are woven meshes, and the first wick portion is more loosely than the second wick portion.

13. The vapor chamber according to claim 9, wherein the first and second wick portions are made of sintering powder, and a powder size of the first wick portion is larger than that of the second wick portion.

14. The vapor chamber according to claim 9, wherein the aperture density of the first wick portion is larger than that of the third wick portion.

15. The vapor chamber according to claim 14, wherein the first and third wick portions are woven meshes, and the first wick portion is more densely than the third wick portion.

16. The vapor chamber according to claim 14, wherein the first and third wick portions are made of sintering powder, and a particle size of the first wick portion is smaller than that of the third wick portion.