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US 5,574,554 AGranted
Contact lens inspection apparatus and lens mold for use in such apparatus
AssigneeCiba-Geigy Corporation
InventorsKai C. Su, Jack C. White, Mushir Siddiqui
Life of this patent
Estimating the term…
Abstract
Collimated white light is transmitted through a transparent lens mold having a molded lens resting on a curved surface thereof. A telecentric lens and a camera having a digital output are used to view the illuminated lens to obtain pixel image data of the lens. The pixel image data is analyzed by a computer to detect deformities in the molded lens.
Claims6
An automated contact lens inspection system comprising:
- a contact lens support;
- a light source for illuminating a contact lens located on said contact lens support;
- a photographic lens having a field of view positioned over said contact lens support so as to view the contact lens illuminated by said light source;
- a camera coupled to said photographic lens for obtaining an image of the contact lens viewed by said photographic lens and for generating image data denoting pixel image densities of the image of the contact lens;
- and,
- a computer programmed to detect abnormalities of the contact lens located on said contact lens support based on the image data generated by said camera;
- wherein said contact lens support is a mold member used to mold the contact lens located thereon;
- and
- wherein said mold member is transparent and includes a convex surface having an optical finish and an opposite concave surface having an optical finish, and wherein said light source directs light through said mold member from one of said concave surface and said convex surface to the other of said concave surface and said convex surface and then through the contact lens resting on said other of said concave surface and said convex surface.
6 more elements
Dependencies are inferred from the claim text.