G - Physics – 03 – B
Patent
G - Physics
03
B
G03B 21/00 (2006.01) G01M 11/02 (2006.01)
Patent
CA 2113295
In the process for producing ophtalmic progressive lenses, it is common practice to inspect lenses using a lamp and the effects of ambiant light refraction to detect surface imperfections as well as for retreiving manufacturers markings. Such markings containing key process information are mandatory for further finishing and cutting processes of the ophtalmic progressive lenses. In this invention, light is generated by a coherent light source at a given wavelenght that may range between 620 and 670 nanometer and collimated prior to being difused over the surface of the lens under inspection. The lens under inspection may be moved at an angle .beta. in the path of the difused light to enhance light refraction occuring onto the markings and other surface imperfections. The light is thus refracted to a projection surface for viewing by the human eye (operator) to clearly examine the markings as well as the surface imperfections before and after coatings and other treatments. In this invention, the optical aparatus is contained into an instrument which encompasses all of the necessary mechanism to enable the examination of most types of ophtalmic lenses.The angle .beta. may be modified by the operator to adapt to different lenses curvature. This is achieved by manipulation of a controller arm until optimum viewing is achieved. The light source intensity as well as focus may be adjusted during the process of examining lenses.
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