Apparatus and method for detecting hidden marks on...

Details Apparatus and method for detecting hidden marks on... Apparatus and method for detecting hidden marks on...

G - Physics

01

M

G01M 11/00 (2006.01) B01L 9/00 (2006.01) G02C 7/02 (2006.01)

Patent

CA 2054913

-15- AN APPARATUS AND METHOD FOR DETECTING HIDDEN MARKS ON PROGRESSIVE ASPHERIC OPHTHALMIC LENSES Abstract of the Invention: A device for detecting hidden marks on progressive aspheric ophthalmic lens is disclosed. The device includes a housing, a light source within the housing, a magnifying lens mounted above the housing and a target element mounted within the housing between the light source and the magnifying lens. A progressive aspheric ophthalmic lens is supported by the housing at a position between the target element and the magnifying lens. A light beam is directed from the light source through the target element, the ophthalmic lens and the magnifying lens. The ophthalmic lens is then visually inspected through the magnifying lens against a background provided by the target element to detect the hidden marks.

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