Product for molding glass lenses having difficult shapes

Details Product for molding glass lenses having difficult shapes Product for molding glass lenses having difficult shapes

1996-04-29

1998-06-09

Czaja, Donald E.

Glass manufacturing

Processes

Reshaping or surface deformation of glass preform

65 26, 65168, 65169, 65170, 65286, 65305, 653741, C03B 2100, C03B 4000

Patent

active

057626766

ABSTRACT:
An improved tool is provided for pressing glass into a precision optical element having a strong concave surface. The tool is selected from ceramic and metal materials having coefficients of thermal expansion greater than the coefficient of the pressed glass. Preferred tools include a base material selected from Invar, steel and alumina with a surface layer selected from alumina, zirconia, chromium oxide and chromium carbide, having a finished thickness in the range between ten to two thousand angstroms.

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Perry, Robert. Chemical Engineers' Handbook, 5th Ed. pp. 3-100, 1980.
Rodgers, Steve. "Tooling Materials for Composites Manufacture". Advanced Materials & Processes, pp. 47-51, Apr. 1990.

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