Lens and Window Separation Can Result from Mechanical Overstress

What the evidence preview establishes

The failures were most consistent with mechanical or thermomechanical overstress rather than a recent construction change. Dimensions and materials closely matched an earlier construction, and the original window glass-to-metal adhesion appeared sound.

Why this case matters

When a small optical assembly separates, compare dimensions and materials across production periods and inspect both mating fracture surfaces. Good original adhesion and stable construction shift attention toward service or handling loads.