SCREW HOLE INSULATION BOARD

摘要

PROBLEM TO BE SOLVED: To provide a screw hole of an insulation board which prevents cracks along a weld line and fixed an IC socket surely to an inspection board. SOLUTION: An elliptical screw hole of insulation board is formed in a corner of an insulation board bottom wall. A long axis of the elliptical screw hole is disposed in a direction forming almost 45 deg. to an adjacent side wall.