Fastening Structure

A fastening structure, comprising:

• a first plate formed of a first material with a first thermal conductivity and having a first passageway with a first diameter;
• a second plate formed of a second material with a second thermal conductivity less than the first thermal conductivity and having a protrusion with a second diameter smaller than the first diameter;
• and
• a sheet member disposed on the first plate such that a second passageway of the sheet member communicates with the first passageway of the first plate and the first plate is interposed between the sheet member and the second plate, the sheet member formed of a third material having a third thermal conductivity less than the second thermal conductivity, a portion of the protrusion extends through the first passageway and the second passageway, the first plate is fastened to the second plate by thermal deformation of the portion of the protrusion extending through the first passageway and the second passageway or by overmolding to the portion of the protrusion extending through the first passageway and the second passageway.