US 12,262,514 B2
Heat sinks with beyond-board fins
Shurong Tian, Mount Kisco, NY (US); Todd Edward Takken, Brewster, NY (US); and Joshua M. Rubin, Albany, NY (US)
Assigned to International Business Machines Corporation, Armonk, NY (US)
Filed by International Business Machines Corporation, Armonk, NY (US)
Filed on Apr. 8, 2021, as Appl. No. 17/226,018.
Prior Publication US 2022/0330414 A1, Oct. 13, 2022
Int. Cl. H05K 7/20 (2006.01); H01L 23/367 (2006.01); H01L 23/427 (2006.01); H05K 1/02 (2006.01)
CPC H05K 7/20509 (2013.01) [H01L 23/3672 (2013.01); H01L 23/427 (2013.01); H05K 1/0203 (2013.01); H05K 7/205 (2013.01); H05K 7/2029 (2013.01); H05K 2201/066 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An apparatus comprising:
a circuit board;
one or more heat-generating components attached to a surface of the circuit board, wherein each of the heat-generating components has a top surface facing away from the circuit board; and
an air-cooled heat sink attached in thermal contact with the top surface of at least one of the one or more heat-generating components, the heat sink comprising:
a heat sink base;
primary heat removal fins protruding from the heat sink base in a direction away from the circuit board, wherein the primary heat removal fins have air gaps therebetween; and
secondary heat removal fins protruding from the heat sink base in a direction toward the circuit board,
wherein:
a first portion of the secondary heat removal fins extend from the heat sink base through a hole formed in the circuit board at a position laterally offset from the heat-generating component, wherein the first portion of secondary heat removal fins have air gaps therebetween,
a second portion of the secondary heat removal fins extend from the heat sink base to abut the circuit board, wherein the second portion of secondary heat removal fins have air gaps therebetween, and
a third portion of the secondary heat removal fins extend from the heat sink base, laterally past an edge of the circuit board, and protrude down beyond the circuit board, wherein the third portion of secondary heat removal fins have air gaps therebetween; and
the primary heat removal fins comprise a first portion of the primary heat removal fins opposite the first portion of the secondary heat removal fins, a second portion of the primary heat removal fins opposite the second portion of the secondary heat removal fins, and a third portion of the primary heat removal fins opposite the third portion of the secondary heat removal fins;
the first portion of the secondary heat removal fins have a greater height than the first portion of the primary heat removal fins have;
the second portion of the secondary heat removal fins have a smaller height than the second portion of the primary heat removal fins have; and
the third portion of the secondary heat removal fins have a smaller height than the third portion of the primary heat removal fins have.