High-index substrates
AssigneeSchott AG
InventorsJens Ulrich Thomas, Frank-Thomas Lentes, Simone Monika Ritter, Benedikt Ziebarth
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Abstract
A glass article has a refractive index nG≥1.95 and an R-number in a range of from 0.900 to 1.050. The R-number is calculated according to the following formula: R = ( n G - 1 ) ( ln [ λ G 2 - λ min 2 λ G 2 - λ max 2 · λ max 2 λ min 2 ] 42 ln [ λ B 2 - λ min 2 λ B 2 - λ max 2 · λ R 2 - λ max 2 λ R 2 - λ min 2 ] + 1 2.8 ) . λR=656 nm, λG=587 nm and λB=486 nm, λmin=33 nm, and nG is a refractive index of the glass article at a wavelength of 587 nm.
Claims14
A glass article having a refractive index nG≥2.05 and an R-number in a range of from 0.900 to 1.050, wherein the R-number is calculated according to the following formula:
- R
- =
- (
- n
- G
- -
- 1
- )
-
- (
- ln
- [
- λ
- G
- 2
- -
- λ
- min
- 2
- λ
- G
- 2
- -
- λ
- max
- 2
- ·
- λ
- max
- 2
- λ
- min
- 2
- ]
- 42
-
- ln
- [
- λ
- B
- 2
- -
- λ
- min
- 2
- λ
- B
- 2
- -
- λ
- max
- 2
- ·
- λ
- R
- 2
- -
- λ
- max
- 2
- λ
- R
- 2
- -
- λ
- min
- 2
- ]
- +
- 1
- 2.8
- )
- ;
- wherein λR=656 nm, λG=587 nm and λB=486 nm, wherein λmin=33 nm, and wherein nG is a refractive index of the glass article at a wavelength of 587 nm, wherein the glass article comprises a glass that comprises SiO2 and B2O3 and a sum of the proportions of SiO2 and B2O3 is less than 20.0 mol %.
Dependencies are inferred from the claim text.