| 摘要 |
An inspection apparatus for measuring the flange of a can prior to forming the flange into a radially outward directed flange includes a light generating element for generating generally parallel light rays of a light beam along an axis and a refractor for receiving the parallel light rays and separating the light rays into a first light beam and a second light beam. The first light beam propagates generally along the axis into the can and is reflected within the can to produce a lighted image of the inside edge of the flange. The second light beam propagates at an angle relative to the axis to illuminate and produce a lighted image of the outside edge of the flange. A video camera generates image data from the lighted images, and a data processor interprets the image data. The refractor includes an outer cylindrical member and an inner cylindrical member disposed in a cavity extending through the outer cylindrical member. The inner cylindrical member includes a receiving opening at a first end thereof for receiving the light generating element, such as a fiber optic cable. The light rays enter the refractor at the receiving opening and are refracted upon entry. A first, preferable conical refractive surface is located at the end of the inner cylindrical member to refract the light rays to form the first light beam. A second, preferably concave, refracting surface is located on the end of the outer cylindrical member to refract the light rays to form the second light beam.
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