Electronic device
An electronic device includes a heat-receiving block, a heat transfer member, and fins. The heat-receiving block has a first main surface to which an electronic component is attached. The heat transfer member is attached to a second main surface of the heat-receiving block opposite to the first main surface, and transfers heat transferred from the electronic component through the heat-receiving block in a direction away from the second main surface. The fins have main surfaces and are attached to the heat transfer member with the main surfaces being inclined with respect to a horizontal plane for a vehicle being located horizontally. The fins dissipate heat transferred from the electronic component through the heat-receiving block and the heat transfer member into ambient air.
1 . An electronic device installable on a vehicle, the electronic device comprising:
a heat-receiving block being heat conductive, the heat-receiving block having a first main surface to which an electronic component is attached;
a heat transfer member attached to a second main surface of the heat-receiving block, the second main surface being opposite to the first main surface, the heat transfer member extending away from the second main surface to transfer heat transferred from the electronic component through the heat-receiving block in a direction away from the second main surface;
one or more fins having main surfaces, the one or more fins being attached to the heat transfer member with the main surfaces being inclined at a nonzero angle with respect to a horizontal plane for the vehicle being located horizontally and configured to dissipate heat transferred from the electronic component through the heat-receiving block and the heat transfer member into ambient air; and
a housing accommodating the electronic component, the housing having an opening in a vertically upper portion of the housing, the housing being installable on a roof of the vehicle, wherein
the heat-receiving block is attached to the housing with the first main surface covering the opening of the housing.
2 . An electronic device installable on a vehicle, the electronic device comprising:
a heat-receiving block being heat conductive, the heat-receiving block having a first main surface to which an electronic component is attached;
a heat transfer member attached to a second main surface of the heat-receiving block, the second main surface being opposite to the first main surface, the heat transfer member extending away from the second main surface to transfer heat transferred from the electronic component through the heat-receiving block in a direction away from the second main surface; and
a plurality of fins having main surfaces, the plurality of fins being attached to the heat transfer member with the main surfaces being inclined with respect to a horizontal plane for the vehicle being located horizontally and configured to dissipate heat transferred from the electronic component through the heat-receiving block and the heat transfer member into ambient air, wherein
the plurality of fins are arranged in a width direction of the vehicle, and
each fin of the plurality of fins attached to the heat transfer member has, for the vehicle being located horizontally, one of two ends in the width direction nearer a center of the vehicle located vertically lower than the other of the two ends.
3 . An electronic device installable on a vehicle, the electronic device comprising:
a heat-receiving block being heat conductive, the heat-receiving block having a first main surface to which an electronic component is attached;
a heat transfer member attached to a second main surface of the heat-receiving block, the second main surface being opposite to the first main surface, the heat transfer member extending away from the second main surface to transfer heat transferred from the electronic component through the heat-receiving block in a direction away from the second main surface; and
a plurality of fins having main surfaces, the plurality of fins being attached to the heat transfer member with the main surfaces being inclined with respect to a horizontal plane for the vehicle being located horizontally and configured to dissipate heat transferred from the electronic component through the heat-receiving block and the heat transfer member into ambient air, wherein
the plurality of fins are arranged in four rows in a width direction of the vehicle,
the plurality of fins attached to the heat transfer member include fins in two rows at respective two ends in the width direction, and each of the fins in the two rows at the respective two ends has, for the vehicle being located horizontally, one of two ends in the width direction nearer a center of the vehicle located vertically higher than the other of the two ends, and
the plurality of fins attached to the heat transfer member include fins in two rows at the center of the vehicle in the width direction, and each of the fins in the two rows at the center has, for the vehicle being located horizontally, one of two ends in the width direction nearer the center of the vehicle vertically lower than the other of the two ends.
4 . The electronic device according to claim 1 , wherein
the one or more fins include a plurality of fins arranged in a width direction of the vehicle and in the direction away from the second main surface.
5 . The electronic device according to claim 1 , wherein
the one or more fins include a plurality of fins arranged in a width direction of the vehicle, and
the plurality of fins attached to the heat transfer member have main surfaces perpendicular to a horizontal direction for the vehicle being located horizontally.
6 . The electronic device according to claim 5 , wherein
the plurality of fins are arranged in the width direction and in the direction away from the second main surface, and
at least one fin of the plurality of fins arranged in the direction away from the second main surface is displaced in the width direction from another of the plurality of fins adjacent to the at least one fin in the direction away from the second main surface.
7 . The electronic device according to claim 1 , wherein
the heat transfer member extends vertically for the vehicle being located horizontally.
8 . The electronic device according to claim 1 , wherein
the heat transfer member extends at an acute angle with respect to the horizontal plane for the vehicle being located horizontally.
9 . The electronic device according to claim 8 , wherein
the electronic device includes a plurality of the heat transfer members arranged in a width direction of the vehicle, and
the plurality of heat transfer members extend away from the second main surface and extend from a center toward an end in the width direction.
10 . The electronic device according to claim 8 , wherein
the electronic device includes a plurality of the heat transfer members arranged in a width direction of the vehicle,
the plurality of heat transfer members include a heat transfer member nearer an end of the vehicle in the width direction extending away from the second main surface and extending toward the end of the vehicle in the width direction, and
the plurality of heat transfer members include a heat transfer member nearer a center of the vehicle in the width direction extending away from the second main surface and extending toward the center of the vehicle in the width direction.
11 . The electronic device according to claim 1 , wherein
the second main surface of the heat-receiving block is inclined with respect to the horizontal plane for the vehicle being located horizontally.
12 . The electronic device according to claim 1 , wherein
the heat transfer member includes
a base attached to the heat-receiving block,
an extension attached to the base and extending away from the heat-receiving block, and
a holder attached to the extension, the holder extending away from the extension, the holder holding the one or more fins attached to the holder.
13 . The electronic device according to claim 12 , wherein
the holder extends along the second main surface.
14 . The electronic device according to claim 12 , wherein
the holder has one end attached to the extension at a position vertically lower than the other end of the holder.
15 . The electronic device according to claim 12 , wherein
the heat transfer member includes a plurality of the holders, and
the plurality of holders each have an elongated circular cross section when taken perpendicular to an extension direction of the holder, and the elongated circular cross section of at least one of the plurality of holders has a longitudinal direction inclined with respect to the horizontal plane for the vehicle being located horizontally.
16 . The electronic device according to claim 1 , wherein
the electronic component receives power and generates heat independently of whether the vehicle is traveling.
17 . The electronic device according to claim 1 , wherein
the heat transfer member includes a heat pipe containing a coolant therein.
18 . The electronic device according to claim 1 , wherein
the housing is accommodated in a container being a recess open vertically upward on the roof of the vehicle.
19 . The electronic device according to claim 18 , wherein
for the vehicle being located horizontally, the heat transfer member and the one or more fins each have a vertically upper end located higher than a vertically upper end of the recess.
20 . The electronic device according to claim 1 , wherein the heat-receiving block is disposed outside the housing.