Manufacturing & Quality

Scratch-dig surface quality describes limits on visible imperfections in an optical surface. Under the MIL-PRF-13830B convention, 40-20 means a scratch comparison grade of 40 and a maximum dig diameter of 0.20 mm; 60-40 means grade 60 and 0.40 mm. Lower numbers set tighter limits within the same inspection system. The scratch number is not a …

The optical lens manufacturing process may include raw material preparation, initial shaping, grinding and polishing, cleaning, coating and inspection before shipment. The production route depends on the material, lens geometry, optical requirements, coating specification, quantity and application. A standard lens made to an established specification may follow a familiar route; a custom component needs its …