Fine pattern transfer mold and fine pattern molding method

A fine pattern transfer mold that transfers a fine pattern to an inner surface of a hollow product by injection molding, comprising:

• a mold body including a fixed body and a movable body separable from each other, the fixed body having a coupling surface coupled to the movable body, the movable body having a coupling surface facing the coupling surface of the fixed body;
• a cavity formed in a concave shape on the coupling surface of the fixed body;
• a core pin member projecting from the coupling surface of the movable body so as to face the cavity, the core pin member having a predetermined portion at which a fine pattern original plate for transfer of the fine pattern is mounted;
• a product formation chamber that is formed between the cavity and the core pin member with the fixed body and the movable body clamped together;
• a gate having an opening that is located in the product formation chamber and outside an end of a transfer surface of the fine pattern original plate in a horizontal direction of the transfer surface and which faces the end of the transfer surface;
• and
• a hot runner member that has formed a flow path for a predetermined resin material in the fixed body and includes an injection nozzle directly coupled to the gate, the hot runner member being configured to:
• heat the flow path;
• and
• guide the resin material to the injection nozzle while maintaining, through the heated flow path, the resin material in a molten state at a predetermined temperature, wherein
• the core pin member and the fine pattern original plate mounted at the end portion of the core pin member constitute a stacked structure;
• the stacked structure has an outer side surface that comprises:
• a first outer side surface with which the resin material injected toward the transfer surface comes into contract;
• and
• a second outer side surface of the end portion, the first outer side surface being on the second outer side surface;
• and
• the outer side surface of the stacked structure has a chamfered surface tapered toward the transfer surface of the fine pattern original plate;
• and
• the molten resin material is injected from the injection nozzle via the gate in a direction toward the transfer surface to integrally mold the hollow product in the product formation chamber.