Method for fabricating preforms for molded lenses

Details Method for fabricating preforms for molded lenses Method for fabricating preforms for molded lenses

1994-07-21

1997-09-09

Czaja, Donald E.

Glass manufacturing

Processes

Forming product or preform from molten glass

65 213, 65 37, 65 65, 4285428, C03B 1900

Patent

active

056651350

ABSTRACT:
Optical glass of cubic, spherical or polygonal shape is fire polished on a graphite or Cr.sub.2 O.sub.3, concave surface with a surface roughness of 100 Angstroms or less. The optical glass having a surface roughness of 400 Angstroms or less is placed on the concave surface and fire polished by heating the optical glass between the yield point and softening point of the glass in a reducing atmosphere if the concave surface is made of graphite. A Cr.sub.2 O.sub.3 concave surface is required for Pb.sup.+2 containing glasses. The molded preform obtained has a surface roughness of 100 Angstroms or less.

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