Heat sink

A heat sink connected with a heated surface of a heat generation component, an ambient airflow flowing into the heat sink to remove heat from the heat generation component, the heat sink comprising:

• a bottom surface close to the heated surface;
• a top surface away from the heated surface and opposed to the bottom surface;
• and
• plural first fins and plural second fins alternately and separately arranged between the top surface and the bottom surface along a specified axis direction, wherein plural airflow channels are defined by the plural first fins, the plural second fins, the top surface and the bottom surface collaboratively, and each airflow channel comprises an airflow inlet and an airflow outlet,
• wherein an area of the first fin is larger than an area of the second fin, and the first fin has a first non-overlapped zone and a second non-overlapped zone with respect to a projection area of the second fin along the specified axis direction, wherein the first non-overlapped zone is located at the airflow inlet, and a first width of the first non-overlapped zone near the heated surface is larger than a second width of the first non-overlapped zone away from the heated surface, wherein the second non-overlapped zone is located at the airflow outlet, and a first width of the second non-overlapped zone near the heated surface is smaller than a second width of the second non-overlapped zone away from the heated surface.