Patent ID: 7060175

Claim:
A method of producing an optical element forming die, comprising: (a) cutting a base member to form a base optical surface thereof while rotating the base member; (b) cutting an outer circumferential surface of the base member so that an optical axis of the base optical surface is identical to a rotation center of the outer circumferential surface of the base member while rotating the base member; (c) forming an optical surface having a predetermined pattern onto the base optical surface of the base member; (d) forming, by electroforming conducted with the base member, an electroforming mold having an optical transfer surface complementary to the optical surface having the predetermined pattern on the base member; and (e) cutting an outer circumferential surface of the electroforming mold on the basis of the outer circumferential surface of the base member so that the optical axis of the base optical surface is identical to a rotational center of the electroforming mold while rotating the electroforming mold together with the base member to obtain the optical element forming die having the optical transfer surface.