Light source device and cooling method
A light source device includes: a first light emitting element; a second light emitting element; and a heat sink configured to dissipate heat of the first light emitting element and heat of the second light emitting element. The heat sink includes: a first heat dissipation portion that is disposed on a flow path of a fluid, the first heat dissipation portion being configured to radiate the heat of the first light emitting element and the heat of the second light emitting element to the fluid; and a second heat dissipation portion that is disposed on the flow path, the second heat dissipation portion being configured to radiate the heat of the second light emitting element to the fluid.
1 . A light source device comprising:
a first light emitting element;
a second light emitting element disposed adjacent to the first light emitting element;
a heat sink disposed within a flow path of a fluid and comprising a first heat dissipation portion and a second heat dissipation portion configured to transfer heat generated by the first light emitting element and heat of the second light emitting element to the fluid
a first heat pipe thermally connecting the first light emitting element to only the first heat dissipation portion from among the first heat dissipation portion and the second heat dissipation portion; and
a second heat pipe thermally connecting the second light emitting element to the first heat dissipation portion and to the second heat dissipation portion.
2 . The light source device according to claim 1 , wherein
a portion of the fluid that does not pass through the first heat dissipation portion flows through the second heat dissipation portion.
3 . The light source device according to claim 1 , wherein
the first and second heat dissipation portions are disposed in a stepped shape as a whole such that a distal end of the second heat dissipation portion on an upstream side of the flow path is positioned downstream of the flow path with respect to a distal end of the first heat dissipation portion on the upstream side of the flow path.
4 . The light source device according to claim 1 , wherein
the first light emitting element is disposed at a position upstream on the flow path with respect to the second light emitting element.
5 . The light source device according to claim 1 , wherein
the first heat pipe and the second heat pipe are disposed at positions derived by shifting first and second positions on a virtual line along a first direction orthogonal to the flow path, toward opposite sides in a second direction orthogonal to the flow path and the first direction, in the first heat dissipation portion.
6 . The light source device according to claim 5 , wherein
the first heat dissipation portion includes
a plurality of fins, and
a separator that causes the fluid to separately flow into a first space on a side of the first heat pipe and a second space on a side of the second heat pipe, in the second direction.
7 . The light source device according to claim 1 , wherein
the first heat dissipation portion and the second heat dissipation portion are configured as independent parts.
8 . The light source device according to claim 1 , wherein
the first heat dissipation portion and the second heat dissipation portion each include a plurality of fins.
9 . The light source device according to claim 8 , wherein
an interval between the plurality of fins included in the second heat dissipation portion is smaller than an interval between the plurality of fins included in the first heat dissipation portion.
10 . The light source device according to claim 1 , wherein
a maximum junction temperature of the first light emitting element is lower than a maximum junction temperature of the second light emitting element.
11 . The light source device according to claim 1 , wherein
a heat generation amount of the second light emitting element is larger than a heat generation amount of the first light emitting element.
12 . The light source device according to claim 1 , wherein
the first light emitting element is a light emitting element configured to emit red light.
13 . The light source device according to claim 1 , wherein
the second light emitting element is a light emitting element configured to emit green light.
14 . The light source device according to claim 1 , wherein
the first light emitting element and the second light emitting element are semiconductor light emitting elements.
15 . A heat exchanger for a light source device comprising:
a heat sink configured to be disposed within a flow path of a fluid and comprising a first heat dissipation portion and a second heat dissipation portion that are adjacent to one another
a first heat pipe thermally connected to only the first heat dissipation portion from among the first heat dissipation portion and the second heat dissipation portion and configured to be thermally connected to a first light emitting element; and
a second heat pipe thermally connected to the first heat dissipation portion and the second heat dissipation portion and configured to be thermally connected to a second light emitting element.
16 . A method of cooling a first light emitting element and a second light emitting element that is disposed adjacent to the first light emitting element which are both thermally connected to a heat sink that includes a first heat dissipation portion and a second heat dissipation portion disposed within a flow path of a fluid, the method comprising:
transferring heat from the first light emitting element to a first heat pipe;
transferring heat from the second light emitting element to a second heat pipe;
transferring heat from the first heat pipe to only the first heat dissipation portion from among the first heat dissipation portion and the second heat dissipation portion; and
transferring heat from the second heat pipe to the first heat dissipation portion and to the second heat dissipation portion.
17 . The light source device according to claim 15 , wherein
the first heat pipe and the second heat pipe are offset from one another in a direction perpendicular to the flow path.
18 . The light source device according to claim 1 , wherein:
a first allowable thermal resistance between the first light emitting element and the fluid isa difference between a maximum junction temperature and an ambient temperature divided by a heat generation amount of the first light emitting element;
a second allowable thermal resistance between the second light emitting element and the fluid is a difference between a maximum junction temperature and an ambient temperature divided by a heat generation amount of the second light emitting element; and
the first allowable thermal resistance is greater than the second allowable thermal resistance.
19 . The light source device according to claim 17 , wherein
the second heat pipe is longer than the first heat pipe.
20 . The light source device according to claim 17 , further comprising
a third heat pipe thermally connected to the first heat dissipation portion and the second heat dissipation portion and configured to be thermally connected to a second light emitting element.