| 摘要 |
PROBLEM TO BE SOLVED: To provide an injection molding capable of avoiding a risk of cracking or chipping due to concentration of stress on a synthetic resin part during cooling after molding.SOLUTION: A synthetic resin part 13 is molded by injection on a metallic outer frame 12. A stress dispersion part 17 in a rugged shape which disperses stress during shrinkage etc., accompanying a drop in temperature of the synthetic resin part 13 is provided between the outer frame 12 and synthetic resin part 13. The stress dispersion 17 comprises a hole 17a formed in the outer frame 12 and a protrusion 17b of the synthetic resin part 13 positioned in the hole 17a. |
