US 12,256,520 B2
Wick sheet for vapor chamber, vapor chamber, and electronic apparatus
Kazunori Oda, Tokyo-to (JP); Toshihiko Takeda, Tokyo-to (JP); Shinichiro Takahashi, Tokyo-to (JP); and Takayuki Ota, Tokyo-to (JP)
Assigned to DAI NIPPON PRINTING CO., LTD., Tokyo (JP)
Appl. No. 17/789,695
Filed by DAI NIPPON PRINTING CO., LTD., Tokyo-to (JP)
PCT Filed Jan. 8, 2021, PCT No. PCT/JP2021/000478
§ 371(c)(1), (2) Date Jun. 28, 2022,
PCT Pub. No. WO2021/141110, PCT Pub. Date Jul. 15, 2021.
Claims priority of application No. 2020-003029 (JP), filed on Jan. 10, 2020.
Prior Publication US 2023/0026517 A1, Jan. 26, 2023
Int. Cl. H05K 7/20 (2006.01)
CPC H05K 7/20336 (2013.01) 15 Claims
OG exemplary drawing
 
1. A wick sheet for a vapor chamber, the wick sheet being sandwiched between a first sheet and a second sheet of the vapor chamber where a working fluid is enclosed, the wick sheet comprising:
a sheet body having a first body surface and a second body surface opposite the first body surface;
a first vapor flow channel portion extending from the first body surface to the second body surface of the sheet body, vapor of the working fluid passing through the first vapor flow channel portion;
a liquid flow channel portion provided on the second body surface, the liquid flow channel portion communicating with the first vapor flow channel portion and allowing liquid of the working fluid to pass through the liquid flow channel portion; and
a second vapor flow channel portion provided on the first body surface, the second vapor flow channel portion communicating with the first vapor flow channel portion and allowing the vapor of the working fluid to pass through the second vapor flow channel portion,
wherein the sheet body includes a land portion having a longitudinal direction being a first direction, and the first vapor flow channel portion is disposed around the land portion, and
wherein the second vapor flow channel portion includes a vapor flow channel groove extending from one of side edges of the land portion to the other of the side edges in a second direction orthogonal to the first direction.