MECHANISM FOR PLACING OPTICAL LENS BLANK IN HOLDER

摘要

Antireflection films are formed on both sides of an optical lens by sputtering in a sputtering film forming device. A plurality of optical lens blanks are laid horizontally on a blank holder (26) in a vacuum treatment chamber (22) for sputtering. The blank holder (26) is placed rotatably in a vacuum atmosphere. The optical lens blanks are buried in holes (26a) formed in the blank holder (26) by using annular holding members (52, 152) with their concave surfaces upward. When the edge thickness of the optical lens blank is large, an annular holding member (52) is higher than the edge of the optical lens blank (11) by 2 mm at most. When the edge thickness of the optical lens blank is small, the part of the annular holding member (152) continuous with the upper surface of the optical lens blanks (111) is tapered.