Patent ID: 6772608
Filing Date: 2004-08-10
Classification: G02B

Abstract:
Method for producing UV polarizers with a polarizing effect based on dichroitic absorption comprisingin a first step embedding metal ions in a glass body in a near-surface layer; and in a second step tempering the glass to have the metal ions reduced to and precipitated in form of crystalline particles; and in a third step an after-tempering takes place in a non-reducing atmosphere to transform the particles produced in the second step into particles of a larger size; and in a fourth step embedding metal ions in the same manner as that done in the first step; and in a fifth step tempering the glass again, with the metal ions embedded in the fourth step precipitating in the glass in a near-surface layer in form of crystalline particles that are of a lesser size than those created in the third step; and in a sixth step deforming the glass body at temperatures near the glass transition temperature so that the particles of different sizes are all transformed into particles of revolution-ellipsoidal shapes with varying semiaxis ratios.