LIGHT GUIDE PLATE MOLDING METHOD AND CYCLOOLEFINIC RESIN MOLDING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a method for molding a light guide plate or a cycloolefinic resin, developing excellent transfer properties and an excellent hue and reducing the generation of molding failure caused by impurities or the contamination of a mold. SOLUTION: In the method for injection-molding the light guide plate or the cycloolefinic resin, a mold cavity is brought to a reduced pressure state before filled with a molten resin.