PURPOSE: To make reactivity of a mold with lead small and improve mold release property and oxidation resistance and resistance to release of mold by forming a surface layer consisting of BC compound or mixture mainly containing the BC compound and C on a forming face of mold substrate.
CONSTITUTION: At least one kind of intermediate layer 3 as necessary having 0.02-1.0μm film thickness and selected from silicon, W, Ta, Nb and AlN is provided on a forming face of mold substrate 1 bringing into contact with at least optical glass raw material. Then a surface layer 2 consisting of a BC compound or mixture mainly containing the BC compound and C and having ≥2wt.% B content and having 0.1-2.0μm film thickness is formed on the intermediate layer 3 to provide a mold for forming an optical glass raw material.
NAKANO TOMOHITO
TOKUHIRO SETSUO
