Producing method for optical element molding die and producing method for optical element

A method of producing an optical element forming die, comprising the steps of:

• (a) mounting a base member on a first lathe;
• (b) cutting a base member to form a base optical surface of the base member while rotating the base member on the first lathe;
• (c) 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 on the first lathe;
• (d) removing the base member from the lathe;
• (e) forming a resist layer on the base optical surface of the base member;
• (f) drawing a predetermined pattern on the resist layer by radiating an electronic beam;
• (g) conducting development processing to form an optical surface having the predetermined pattern onto the base optical surface of the base member;
• (h) forming an electroforming mold having an optical transfer surface complementary to the optical surface of the base member by electroforming conducted with the base member;
• (i) mounting the base member and the electroforming mold on a second lathe;
• (j) 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 on the second lathe;
• and
• (k) separating the electroforming mold from the base member to obtain the optical element forming die having the optical transfer surface.

A method of producing an optical element forming die, comprising:

• (a) cutting a base member to form a base optical surface of the base member 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;
• (d) forming an electroforming mold having an optical transfer surface complementary to the optical surface of the base member by electroforming wherein the electroforming is conducted with the base member;
• (e) combining a supporting member with the electroforming mold;
• (f) cutting an outer circumferential surface of the supporting member 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 supporting member while rotating the supporting member and the base member;
• and
• (g) separating the electroforming mold from the base member to obtain the optical element forming die having the optical transfer surface.