VAPOR CHAMBER
A vapor chamber that includes a casing, a pillar in an internal space of the casing and that supports the casing from an inside thereof, a working fluid in the internal space of the casing, and recessed portions in at least a portion of a main external surface of the casing.
1 . A vapor chamber comprising:
a casing defining an internal space and having a main external surface, at least a portion of the main external surface having recessed portions;
a pillar in the internal space of the casing and positioned so as to support the casing from inside thereof; and
a working fluid in the internal space of the casing.
2 . The vapor chamber according to claim 1 , wherein the casing further has a main internal surface opposing the main external surface, at least a portion of the main internal surface opposite to the recessed portions having protruding portions.
3 . The vapor chamber according to claim 1 , wherein the casing is composed of two opposed sheets that have their respective outer edge portions sealed to each other.
4 . The vapor chamber according to claim 3 , wherein the main external surface is a first main external surface, and the recessed portions are first recessed portions, a first of the two opposed sheets includes the first recessed portions, a second of the two opposed sheets forms a second main external surface, at least a portion of the second main external surface having second recessed portions.
5 . The vapor chamber according to claim 4 , wherein the first of the two opposed sheets further has a first main internal surface opposing the first main external surface, at least a portion of the first main internal surface opposite to the first recessed portions having first protruding portions, and wherein the second of the two opposed sheets forms a second main internal surface, at least a portion of the second main internal surface opposite to the second recessed portions having second protruding portions.
6 . The vapor chamber according to claim 1 , further comprising at least one wick in the internal space of the casing.
7 . The vapor chamber according to claim 6 , wherein the at least one wick is interposed between a main internal surface of the casing and the pillar.
8 . The vapor chamber according to claim 6 , wherein the at least one wick includes two wicks, a first of the two wicks in contact with a first main internal surface of the casing, and a second of the two wicks in contact with a second main internal surface of the casing opposite the first main internal surface.
9 . The vapor chamber according to claim 1 , wherein the recessed portions are each shaped like a cylinder.
10 . The vapor chamber according to claim 1 , wherein the recessed portions are each shaped like a quadrangular pillar.
11 . The vapor chamber according to claim 1 , wherein an equivalent circle diameter of each bottom surface of the recessed portions is 1 μm to 500 μm.
12 . The vapor chamber according to claim 1 , wherein the recessed portions are grooves.
13 . The vapor chamber according to claim 12 , wherein a first set of the grooves extend along a first direction, and a second set of the grooves extend along a second direction different from the first direction.
14 . The vapor chamber according to claim 13 , wherein the first direction is orthogonal to the second direction.
15 . The vapor chamber according to claim 12 , wherein a width of each of the grooves is 1 μm to 500 μm.
16 . The vapor chamber according to claim 1 , wherein a depth of each of the recessed portions is 1 μm to 200 μm.
17 . The vapor chamber according to claim 1 , wherein a distance between adjoining recessed portions is 1 μm to 500 μm.
18 . A heat radiation device comprising:
a heating element; and
the vapor chamber according to claim 1 thermally coupled to the heating element by a jointing material that extends into the recessed portions of the casing.
19 . Electronic equipment comprising the heat radiation device according to claim 18 .
20 . Electronic equipment including the vapor chamber according to claim 1 .