Optical glass and process for making precise-pressed optical...

Details Optical glass and process for making precise-pressed optical... Optical glass and process for making precise-pressed optical...

2008-07-08

2008-07-08

Lorengo, Jerry A. (Department: 1793)

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

C501S045000, C501S046000, C501S047000

Reexamination Certificate

active

07396787

ABSTRACT:
The lead-free, preferably lithium-free, optical glass is useful in imaging, projection, telecommunications, optical communication and/or laser technology, particularly for making precise-pressed optical elements. It has a refractive index ndof 1.50 to 1.57, an Abbé number νd of 61 to 70. It also has a low transformation temperature of about or below 400° C., good production and processing properties and crystallization resistance. It has a composition, in percent by weight, based on oxide content of P2O5, 40 to 60; Al2O3, 1 to 20; B2O3, 0 to <5; Na2O, 0 to 30; K2O, 0 to 30; Li2O, 0 to <1; ΣM2O, >15 to 40; BaO, 1 to 20; ZnO, 1 to 20; SrO, 0 to 5; CaO, 0 to 5; MgO, 0 to 5; and ΣMO, 5 to 25. In addition, it may contain standard refining agents, although it is preferably free of arsenic and fluorine.

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