Patent ID: 7480141

Claim:
An electronic device, comprising: a housing having a metal wall portion; a substrate; an electronic component mounted on the substrate; and a heatsink which is connected to the electronic component, wherein the substrate, the electronic component and the heatsink are arranged in the housing, wherein the heatsink comprises a sheet metal plate a portion of which is moved between an engaged position in contact with the metal wall portion of the housing and a disengaged position not in contact with the metal wall portion of the housing depending on a temperature in the housing, and wherein when the portion of the sheet metal plate is moved to the engaged position a heat conductive path is formed between the electronic component and the metal wall portion of the housing that allows heat from the electronic component to flow through the conductive path to the outside of the housing, further comprising a coil spring of a shape-memory alloy arranged to move the portion of the sheet metal plate from the disengaged position to the engaged position as the shape-memory alloy coil spring expands when the temperature in the housing increases to greater than a predetermined temperature.