Lens inspection system using phase contrast imaging

US7855782B2 · kind B2 · utility

Assignee

• Novartis AG · CH

Inventors

• Roger Biel · Aschaffenburg, DE
• Livio Fornasiero · Bliestorf, DE

Key dates

• Filing date: Jan 7, 2010
• Grant date: Dec 21, 2010
• Expiry date: Jan 7, 2030

Classification

• Technology area (CPC G): Physics
• CPC primary: G01M11/02
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The present invention relates to an inspection system for the automatic inspection of ophthalmic lenses, preferably in an automated lens manufacturing line. The inspection system provides a phase contrast imaging unit and an inspection method using said phase contrast imaging unit designed to recognize defective lenses with an improved degree of reliability but that does not falsely sort out perfect lenses.