A heat sink for dissipating a heat from an object includes a plurality of fins. The fins are arranged radially about a center axis to be spaced away from one another, and extend outward in a radial direction substantially perpendicular to the center axis. Each fin is branched at at least two differe
A heat sink for dissipating a heat from an object includes a plurality of fins. The fins are arranged radially about a center axis to be spaced away from one another, and extend outward in a radial direction substantially perpendicular to the center axis. Each fin is branched at at least two different positions in the radial direction into at least three fin end portions spaced away from one another.
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What is claimed is: 1. A heat sink for dissipating heat from an object, the heat sink having a center axis whereby a circumferential direction of the heat sink extends around the center axis and a radial direction of the heat sink extends normally to the center axis, the heat sink comprising: a plu
What is claimed is: 1. A heat sink for dissipating heat from an object, the heat sink having a center axis whereby a circumferential direction of the heat sink extends around the center axis and a radial direction of the heat sink extends normally to the center axis, the heat sink comprising: a plurality of fins spaced from one another about the center axis in the circumferential direction of the heat sink, each of the fins extending lengthwise in an outward direction away from the center axis whereby the fins radiate with respect to the center axis, wherein each of the fins has a stem at a radially inner end thereof and is split radially outwardly of the stem at each of at least two locations, at least two of said locations, at which each fin is split, are offset from one another along the length of each fin such that each fin has at a radially outer end thereof at least three outer fin end portions spaced from one another in the circumferential direction and such that each fin defines slits between adjacent ones of the outer fin end portions, and a radially innermost end of one of the slits is offset radially inwardly along the length of each fin from a radially innermost end of another of the slits. 2. A heat sink according to claim 1, wherein each of the fins lies in a plane extending at an angle to a plane extending radially from the center axis through the radially inner end of each fin, and the fins are angled the same relative to the radial direction of the heat sink. 3. A heat sink according to claim 1, wherein the plurality of fins are curved in the same direction. 4. A heat sink according to claim 3, wherein the at least three outer fin end portions are curved in the same direction. 5. A heat sink according to claim 4, wherein the at least three outer fin end portions extend substantially parallel to each other. 6. A heat sink according to claim 1, wherein the slits defined by each fin include a first slit that is closer to an adjacent one of the fins than at least one other slit defined by each fin, and the first slit has a radially innermost end that is offset radially inwardly along the length of each fin from a radially innermost end of at least one other slit defined by each fin. 7. A heat sink according to claim 6, wherein the fins are curved along the length thereof radially outwardly in one of a counterclockwise direction and a clockwise direction with respect to the center axis of the heat sink, and the first slit is located ahead of at least one of the other of the slits defined by each fin in said one of the counterclockwise direction and the clockwise direction. 8. A heat sink according to claim 1, wherein each of the fins is split in two at a first of said locations so as to have two first fin end portions extending radially outwardly from the first of said locations, and each of the two first fin end portions is split into at least two second fin end portions. 9. A heat sink according to claim 1, wherein each of the fins is split in two at a first of said locations so as to have two first fin end portions extending radially outwardly from the first of said locations, and one of the two first fin end portions is split into at least two second fin end portions, and the other of the two first end portions extends to the radially outermost end of each fin without being split. 10. A heat sink according to claim 9, wherein the fins including the first and second fin end portions thereof are curved so as to have one side that is convex and another side that is concave, and one of the two first fin end portions which is closer to the convex side than the other of the first fin end portions is split into at least two second fin end portions. 11. A heat sink according to claim 9, wherein the fins including the first and second fin end portions thereof are curved so as to have one side that is convex and another side that is concave, and one of the two first fin end portions which is closer to the concave side than the other of the first fin end portions is split into at least two second fin end portions. 12. A heat sink according to claim 1, further comprising a generally columnar base portion centered on the center axis, wherein the fins extend from the base portion outward in the radial direction. 13. A heat sink according to claim 12, wherein the base portion has a center hole centered on the center axis, and a heat conductive core portion fitted within the center hole to the base portion. 14. A cooling apparatus comprising: the heat sink according to claim 1; and a cooling fan arranged coaxially with the center axis of the heat sink and supplying air to the heat sink, wherein the cooling fan includes: an impeller having a plurality of blades and being rotatable about the center axis to generate an axial air flow; a motor rotating the impeller about the center axis; and a housing surrounding the impeller to define an air channel for the axial air flow and supporting the motor. 15. A heat sink according to claim 1, further comprising a generally columnar base portion centered on the center axis, wherein the fins extend from the base portion outward in the radial direction. 16. A heat sink according to claim 15, wherein the base portion has a center hole centered on the center axis, and a heat conductive core portion fitted within the center hole to the base portion. 17. A cooling apparatus comprising: the heat sink according to claim 1; and a cooling fan arranged coaxially with the center axis of the heat sink and supplying air to the heat sink, wherein the cooling fan includes: an impeller having a plurality of blades and being rotatable about the center axis to generate an axial air flow; a motor rotating the impeller about the center axis; and a housing surrounding the impeller to define an air channel for the axial air flow and supporting the motor.
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이 특허에 인용된 특허 (7)
Carter, Daniel P.; Crocker, Michael T.; Broili, Ben M.; Byquist, Tod A.; Llapitan, David J., Electronic assemblies with high capacity curved fin heat sinks.
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