METHOD FOR MACHINING DIE, DIE FOR INJECTION MOLDING, AND OPTICAL ELEMENT

摘要

Disclosed is a method for machining a die, in which burrs and the trace of cut can be prevented from being generated at the edge of an carved portion (72d) because the carved portion (72d) is formed by fixing an auxiliary member (81) for machining to an outer circumferential die (72) and then cutting and polishing both the outer circumferential die (72) and the auxiliary member (81) for machining. Furthermore, a shear drop can be prevented from being generated at the edge at the time of polishing. Consequently, a die (40) for injection molding, in which burrs and the trace of cut are reduced while ensuring high dimensional precision, can be manufactured easily at a low cost. As a result, burrs can be prevented from being generated in the lens OL easily at a low cost.