Patent ID: 7393368

Claim:
A dyeing method of a plastic lens, including the steps of: making a hard coat layer on both surfaces of the lens by dipping the lens in a hard coating liquid including an organic silicone compound and a metal-oxide sol and containing tetrafunctional silane at a compounding ratio of 30% or less by weight with respect to the total solids content and in an amount that the lens is hard to dye by a dip dyeing method due to a three-dimensional crosslinking density of the tetrafunctional silane in making the hard coat layer, and obtaining a lens with hard coat layer having physical property value that each of the surfaces formed with the hard coat layer is abraded by about 6 to 19 scratches by twenty strokes of a steel wool #0000 under a load of 1.5 kg; placing the lens with the hard coat layer in a vacuum vapor deposition device cooling the vacuum vapor deposition device to restrain a temperature of the lens placed in the vapor deposition device from rising above a predetermined temperature before a dyeing operation; placing a base body for dyeing in the vapor deposition device, the base body having a dye application area in which a sublimatable dye is applied, so that the dye application area faces a surface to be dyed of the lens with the hard coat layer; heating the base body in the vapor deposition device under almost vacuum to sublimate the dye, and depositing the sublimed dye on the hard coat layer of the lens; and heating the lens with the hard coat layer, deposited with the dye in an oven under atmospheric pressure to fix the deposited dye on the hard coat layer of the lens.