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A heat sink includes a base having a first side in contact with a heat-generating electronic element and a second side opposed to the first side. Fins are formed on the second side of the base. A non-rectilinear air channel is formed between two adjacent fins, with a length of the non-rectilinear a

A heat sink includes a base having a first side in contact with a heat-generating electronic element and a second side opposed to the first side. Fins are formed on the second side of the base. A non-rectilinear air channel is formed between two adjacent fins, with a length of the non-rectilinear air channel being greater than a length of the base along an extending direction of the fins on the base. The heat sink may be provided to an outlet side of a heat-dissipating fan to form a cooler.

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What is claimed is: 1. A heat sink, comprising: a base having a first side adapted to be in contact with a heat-generating electronic element and a second side opposed to the first side, said base including a pair of side walls each having a non-flat waveform surface, said side walls projecting upw

What is claimed is: 1. A heat sink, comprising: a base having a first side adapted to be in contact with a heat-generating electronic element and a second side opposed to the first side, said base including a pair of side walls each having a non-flat waveform surface, said side walls projecting upwardly from the base and having a first thickness; a set of fins formed on the second side of the base, each of said fins having a second thickness being less than said first thickness of the side wall, said fins disposed between said side walls of the base and each said non-flat waveform surface of said side walls facing at least one of said fins for increasing an area of heat-dissipation; and a non-rectilinear air channel being formed between two of the fins adjacent to each other and between each said non-flat waveform surface of said side walls and one of said fins, with a length of the non-rectilinear air channel being greater than a length of the base along an extending direction of the fins on the base; and a heat dissipating fan being attached to a side of the base to form a cooler for driving air from an end of the respective air channel through another end of the respective air channel. 2. The heat sink as claimed in claim 1, wherein the fins are wavy. 3. The heat sink as claimed in claim 1, wherein the fins are zigzag. 4. The heat sink as claimed in claim 1, wherein the fins are spaced at regular intervals. 5. The heat sink as claimed in claim 1, wherein the fins are spaced at irregular intervals. 6. The heat sink as claimed in claim 1, wherein the fins are continuous. 7. The heat sink as claimed in claim 1, wherein the fins are discontinuous and the air channels are communicated with one another. 8. The heat sink as claimed in claim 2, wherein each said air channel includes a plurality of relatively wider sections and a plurality of relatively narrower sections, further including a heat-dissipating peg formed in each said relatively wider section. 9. The heat sink as claimed in claim 8, wherein the relatively wider sections and the relatively narrower sections are alternately disposed. 10. The heat sink as claimed in claim 9, wherein the heat-dissipating peg is located in the central portion of the respective relatively wider section. 11. The heat sink as claimed in claim 7, wherein each said fin includes a plurality of arc-shaped sections. 12. The heat sink as claimed in claim 11, wherein the arc-shaped sections of the fins form a plurality of rows of arc-shaped sections, with a gap being defined between two adjacent rows of arc-shaped sections. 13. The heat sink as claimed in claim 11, wherein each of said plurality of arc-shaped sections extends along a direction that is at an acute angle with the extending direction of the respective air channel. 14. The heat sink as claimed in claim 1, further comprising a heat-dissipating fan being mounted on top of the heat sink to form a cooler for vertically driving air downward, with the air exiting the respective air channel via two ends of the respective air channel. 15. The heat sink as claimed in claim 1, wherein some of said fins are shorter than the remaining fins to provide at least one wider air guide section, said air guide section has an opening and an orientation thereof mis-aligning with a longitudinal direction of an incoming air flow inlet of the base. 16. A cooler comprising: a heat-dissipating fan including a casing having an outlet, a fan wheel being rotatably mounted in the casing; a heat sink including a base integrally formed with the casing, said base including a pair of side walls each having an non-flat waveform surface, said side walls projecting upwardly from the base and having a first thickness, a set of fins being formed on a side of the base, each of said fins having a second thickness being less than said first thickness of the side wall, said fins disposed between said side walls and each said non-flat waveform surface of said side walls facing at least one of said fins for increasing an area of heat-dissipation; a lid mounted on top of the casing and the fins, the lid including an inlet; and a non-rectilinear air channel being formed between two of the fins adjacent to each other and between each said non-flat waveform surface of said side walls and one of said fins, with a length of the non-rectilinear air channel being greater than a length of the base along an extending direction of the fins on the base; wherein air is driven into the casing via the inlet of the lid, passes through the outlet of the casing, and then exits the fin after passing through the respective air channel. 17. The cooler as claimed in claim 16, wherein the fins are wavy, each said air channel including a plurality of relatively wider sections and a plurality of relatively narrower sections that are alternately disposed, further including a heat-dissipating peg formed in a central portion of each said relatively wider section. 18. The cooler as claimed in claim 16, wherein the fins are zigzag and discontinuous with the air channels being communicated with one another, the arc-shaped sections of the fins forming a plurality of rows of arc-shaped sections, with a gap being defined between two adjacent rows of arc-shaped sections. 19. The cooler as claimed in claim 18, wherein each of said plurality of arc-shaped sections extends along a direction that is at an acute angle with the extending direction of the respective air channel. 20. The cooler as claimed in claim 16, wherein some of said fins are shorter than the remaining fins to provide at least one wider air guide section, said air guide section has an opening and an orientation thereof mis-aligning with a longitudinal direction running along the air outlet of the casing.