Ophtalmic lens inspection with a double focus illumination

A system and method for inspecting ophthalmic lenses. The system comprises a transport subsystem for moving the lenses into an inspection position, and an illumination subsystem to generate a light beam and to direct the light beam through the lenses. The system further comprises an imaging subsyste...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	EBEL, JAMES, EDWARDS, RUSSELL JAMES, SITES, PETER W, DOLAN, MARY LOUISE
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING CONTACT LENSES MEASURING OPTICS PERFORMING OPERATIONS PHYSICS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS SPECTACLES SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURESAS SPECTACLES TESTING TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	A system and method for inspecting ophthalmic lenses. The system comprises a transport subsystem for moving the lenses into an inspection position, and an illumination subsystem to generate a light beam and to direct the light beam through the lenses. The system further comprises an imaging subsystem to generate a set of signals representing selected portions of the light beam transmitted through the lenses, and a processing subsystem to process those signals according to a predetermined program. The illumination subsystem includes a light source to generate a light beam and a diffuser to form that light beam with a generally uniform intensity across the transverse cross section of the light beam. The illumination subsystem further includes a lens assembly to focus a portion of the light beam onto an image plane, and to focus a portion of the light beam onto a focal point in front of the image plane to form a diffuser background pattern on the image plane.