INJECTION-MOLDING METHOD AND INJECTION-MOLDING DIE

摘要

Provided is an injection molding method for a resin substrate, wherein: through-holes are provided on a plate-shaped substrate so that they are penetrated from one surface of the substrate in the direction of the other surface in a way such that the diameter of the hole gradually becomes smaller; and micro-passages that connect to the through-holes are provided on the other surface of the substrate. A cavity is formed by joining a first molding die that forms one surface with a second molding die that forms the other surface. One part of the first molding die that forms the through-holes comprises taper pins that protrude from the first molding die towards the second molding die. The substrate is formed by filling the cavity with resin material, and the substrate is released from the second molding die by separating the first molding die from the second molding die. By pushing out the inner walls of the through-holes with the taper pins that are projected further towards the second molding die, the substrate is released from the first molding die.