Optical glass with negative anomalous partial dispersion

Details Optical glass with negative anomalous partial dispersion Optical glass with negative anomalous partial dispersion

1990-05-31

1992-03-31

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 76, 501903, C03C 3072, C03C 3074, C03C 400

Patent

active

051008432

ABSTRACT:
A glass having a negative anomalous partial dispersion .DELTA.P.sub.g,F, an index of refraction of n.sub.d .gtoreq.1.67 and an Abbe number of .nu..sub.d >36 has the following composition, in % by weight, 3-11 of SiO.sub.2, 0-3 of GeO.sub.2, .SIGMA. SiO.sub.2 +GeO.sub.2, 4.5-11; B.sub.2 O.sub.3, 29-35; 5-13 of Al.sub.2 O.sub.3 ; 1-3 of ZrO.sub.2 ; 0.2-3 of TiO.sub.2 ; 0.2-1.5 of Ta.sub.2 O.sub.5 ; 30-45 of PbO; 0-3 each of Li.sub.2 O, Na.sub.2 O, K.sub.2 O, Rb.sub.2 O, Cs.sub.2 O, .SIGMA. alkali metal oxide 0-3; 0-3.5 each of MgO, CaO, BaO, SrO, .SIGMA. alkaline-earth oxide 0-6, if .SIGMA. SiO.sub.2 and GeO.sub.2 .gtoreq.9; .SIGMA. alkaline-earth oxide 0-3.5, if .SIGMA. SiO.sub.2 and GeO.sub.2 <9; 0-14 of ZnO, 0-3 of La.sub.2 O.sub.3 ; 0-7 of Nb.sub.2 O.sub.3 ; 0-1 of Sb.sub.2 O.sub.3 ; 0-0.3 of As.sub.2 O.sub.3 ; 0-1.5 of WO.sub.3 ; 0-1 of F. This glass is inexpensive and can be produced in high quality, and has a high crystalization stability and good transmission values.

REFERENCES:
patent: 3653933 (1972-04-01), Tsunekawa
patent: 4390638 (1983-06-01), Mennemann et al.
patent: 4721690 (1988-01-01), Ross et al.
patent: 4824809 (1989-04-01), Grabowski et al.
Chem. Abst. vol. 84, No. 22, May 31, 1976, p. 280; Abstract No. 1546 621z & JP-A-76 02717 (Tokunaga).
Izumitani, Optical Glass, New York 1986, pp. 156-157, plus data sheet ADC2 from Hoya Glass Catalog.
Glastechnische Berichte 45, Heft 1, pp. 1-9 (Jan. 1972).

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