Mechanism for setting optical lens base material on holder

A holder setting mechanism for a sputtering film deposition system, wherein a plurality of spectacle lenses, each of which is a minus high-power lens with an upper surface being concave and a lower surface being convex, are respectively placed on a substrate holder through ring-shaped holding tools in a transverse state, and said substrate holder is set to be rotatable in a vacuum atmosphere, and thin films are deposited on the upper and lower surfaces of each spectacle lens of said spectacle lenses at the same time, the improvement comprising a structure that:

• said substrate holder has holes for supporting said ring-shaped holding tools;
• each ring-shaped holding tool of said ring-shaped holding tools has a hooking section at an upper and outer peripheral portion, which is hooked on said hole, and is freely fitted to or removed from said substrate holder, and further has a supporting section for supporting each of said plurality of spectacle lenses at a lower and inner peripheral portion;
• each spectacle lens of said plurality of spectacle lenses is held by said ring-shaped holding tool in a state of directing the concave surface to the upper side and the convex surface to the lower side, and
• wherein said ring-shaped holding tool has a height and each of said plurality of spectacle lenses has an edge having an edge height, said height of said ring-shaped holding tool is larger than said edge height of said plurality of spectacle lenses within the limits of 2 mm, whereby oblique incidence of sputtered particles to a peripheral part in the concave surface of said spectacle lenses is blocked.