Patent ID: 7940528

Claim:
An electronic device, comprising: a casing; a thermal generating element, disposed within the casing and operating to produce thermal energy; and a heat sink, comprising: a thermal transfer plate, contacting the thermal generating element and comprising at least one recess and at least one retaining portion; and at least one movable thermal transfer member, comprising a weight end and a free end, wherein the weight end is accommodated in a respective one of the at least one recess and restricted in the respective one of the at least one recess by a corresponding one of the at least one retaining portion, the thermal energy produced by the thermal generating element is conducted to each of the at least one movable thermal transfer member via the thermal transfer plate, a center of gravity of the each of the at least one movable thermal transfer member is located at the weight end thereof, and when the casing is tilted by a certain angle, the each of the at least one movable thermal transfer member swings relative to the thermal transfer plate, such that the free end of the each of the at least one movable thermal transfer member points to a direction opposite to that of an acceleration of gravity under a normal state.