Optical glass

Details Optical glass Optical glass

1979-10-09

1981-05-19

Vertiz, O. R.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

C03C 314

Patent

active

042683122

ABSTRACT:
An optical glass composition having high refractive index and low dispersion is disclosed which is characterized in that it contains no harmful thorium compound and instead contains WO.sub.3 in a content of 10 to 35 percent by weight introduced into the system of B.sub.2 O.sub.3 -La.sub.2 O.sub.3 -ZrO.sub.2 -Ta.sub.2 O.sub.5. The optical glass herein disclosed has a high refractive index (nd) ranging from 1.85 to 1.97 and a low Abbe's number (.nu.d) ranging from 28 to 38. Also, the optical glass is stable against devitrification and excellent in chemical durability.

REFERENCES:
patent: 3958999 (1976-05-01), Izumitani et al.
patent: 4118238 (1978-10-01), Ishibashi et al.
patent: 4119471 (1978-10-01), Komorita et al.
patent: 4120732 (1978-10-01), Komorita et al.
patent: 4144076 (1979-03-01), Matsumara
patent: 4166746 (1979-09-01), Ishibashi et al.

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