Patent ID: 7500903
Filing Date: 2009-03-10
Classification: B24B

Abstract:
1. A method of manufacturing a spectacle lens comprising: holding the lens by a lens holding tool having a lens holder unit and alloy layer arranged on a rear side of a lens and made of a low-melting alloy, and at least cutting and polishing the lens held by said lens holding tool, wherein said lens holding tool is formed from a lens holder unit and an alloy layer by fixing the lens holder unit and a blocking ring to a mount, laying out a lens which has a convex surface directed to a side of the lens holder unit and is separated from the lens holder unit, and supplying a molten low-melting alloy to a space formed by the lens holder unit, the blocking ring, and the lens and hardening the low-melting alloy to form the alloy layer, wherein the lens holder unit is selected from a plurality of lens holder units having different heights, wherein the blocking ring is selected from a plurality of blocking rings having different inner diameters and different heights, and wherein the lens holder unit and blocking ring are combined so as to set a central thickness of the alloy within a predetermined range independently of a type of lens.