Patent ID: 8238103

Claim:
An electronic component unit comprising: a substrate; an electronic component provided on a surface of the substrate; a heat dissipating member provided on the electronic component; a cylinder member having one end coupled to the substrate, the cylinder member having an other end defining an opening opposed to the heat dissipating member; a piston member having one end inserted in the cylinder member through the opening, the one end of the piston member establishing an airtight space inside the cylinder member, the piston member including a protrusion, the piston member being movable to increase a volume of the airtight space, to a position where the protrusion is to be coupled to the heat dissipating member, so that the airtight space is decompressed to have an air pressure lower than that of outside of the cylinder member; a through hole penetrating the piston member along a longitudinal axis of the piston member, the through hole connecting the airtight space and the outside of the cylinder member; and a stopple member inserted in the through hole from one end of the through hole, the stopple member keeping an air passage around the stopple member inside the through hole, the stopple member configured to move along the longitudinal axis of the piston member to open and close the airtight space at an other end of the through hole.