CPC G01M 11/0278 (2013.01) [G01M 11/0257 (2013.01); G01N 21/958 (2013.01); G06T 7/0004 (2013.01); G01N 2021/9583 (2013.01)] | 7 Claims |
1. A defect analysis and tracing system for clear and cosmetic contact lenses using rear projection, comprising;
a glass cuvette curved to hold a contact lens;
a pair of illumination modules directed towards the cuvette for back and front Illumination;
a diffuser mounted on a horizontal swivel arm to aid in diffusing the Backlit illumination when required;
a rotary wheel mounted with at least two optical filters;
a first optical module focussed at the contact lens for capturing an aberration free image;
a beam splitter to split the beam of light for capturing the image by a computer at one stage and for projection of the image on to a viewing screen at the second stage;
a first camera connected to a computer for image capturing at a first stage, and second camera at a second stage for capturing images from the viewing screen;
a gauge holder for mounting a precision calibration made of glass for measurement of various dimensions and defects of the object under inspection;
a second optical module mounted after the calibration gauge to project an overlaid image of the contact lens and the calibration pattern on the gauge, on to a viewing screening;
a large viewing screen on which the image is projected for accurate measurement of various features of the contact lens.
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