| 摘要 |
PROBLEM TO BE SOLVED: To provide a forming method of an optical element which forms the optical element of a concave meniscus shape up to its side part with high shape accuracy. SOLUTION: The difference of the depth of a cavity in the normal-line direction to a forming surface of a spherical shape is structured as to be 15% or below between a central part and an outer peripheral part of the cavity of a forming mold used in a step of forming a formed glass lump 1 from melt glass. The formed glass lump 1 is formed using the forming mold and press molded to produce an optical element 2, that is a molded product. The more nearly the depth of the cavity of the forming mold for forming the formed glass lump 1 is uniform, the fewer a great swell is generated on the surface of the formed glass lump 1 and the less the shape accuracy of the optical element 2 to be press formed is impaired. COPYRIGHT: (C)2010,JPO&INPIT
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