Cesium-containing optical glass

Details Cesium-containing optical glass Cesium-containing optical glass

1983-11-04

1984-09-18

McCarthy, Helen M.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

65 314, 65 3013, 65 3014, 501 37, 501 38, 501 63, 501 64, 501 65, 501 67, 501 69, 501 72, 501 73, 501 74, 501 77, 501 79, 501903, C03C 1300, C03C 300

Patent

active

044720300

ABSTRACT:
A cesium-containing optical glass comprising, by weight, 32-56% of SiO.sub.2, 6-25% of K.sub.2 O, 6-32% of Cs.sub.2 O, 0-30% of BaO, 0-2.5% of MgO, 5-34% of ZnO, 0-3% of ZrO.sub.2 and 0-5% of SnO.sub.2, provided that the total proportion of BaO, MgO and ZnO is 8-40% and the total proportion of ZrO.sub.2 and SnO.sub.2 is 0.2-6%. When this cesium-containing optical glass is treated in a molten bath containing potassium nitrate, the cesium ion in the glass is easily exchanged with a potassium ion and therefore, the cesium ion concentration gradually decreases radially outwardly from the central axis and the potassium ion concentration gradually increases in that direction. Thus, there is obtained a light converge-type lens in which the refractive index gradually decreases in the same direction.

REFERENCES:
patent: 3827785 (1974-08-01), Matsushita et al.
patent: 3843228 (1974-10-01), Yoshiyagawa et al.
patent: 4367012 (1983-01-01), Ikeda et al.

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