Zinc-containing optical glass materials
View Patent ↗Zinc-containing optical glass materials with a refractive index n d between 1.52 and 1.66, an Abbe number ν d of between 35 and 54 and a composition (in % by weight based on oxide) of: SiO 2 38–58, ZnO 0.3–42, PbO 0–<30, ZnO+PbO 20–55, Li 2 O 0–<3, Na 2 O 0–14, K 2 O 0–12, Li 2 O+Na 2 O+K 2 O ≧2, F 0–3, MgO 0–6, CaO 0–<5, SrO 0–6, BaO 0–<0.9, B 2 O 3 0–<1, Al 2 O 3 0–<1.5 and ZrO 2 0–<2 and, if appropriate, refining agents in the customary amounts.
1. A zinc-containing optical glass with a refractive index (n d ) being in the range of from about 1.52 to about 1.66 and an Abbe number (V d ) being substantially in the range of from about 35 to about 54, said zinc-containing optical glass comprising, on an oxide basis, the composition of:
Percentage
Material
by weight
SiO 2
38–58
ZnO
0.3–42
PbO
0–<30
sum of ZnO + PbO
>30–55
Li 2 O
0–<3
Na 2 O
0–14
K 2 O
0–12
sum of
≧2
Li 2 O + Na 2 O + K 2 O
F
0–3
MgO
0–6
CaO
0–<5
SrO
0–6
BaO
0–<0.9
B 2 O 3
0–<1
Al 2 O 3
0–<1.5
ZrO 2
0–<2
Cs 2 O
0 to about 2.5; ≧0% by weight of at least one
refining agent.
2. The zinc-containing optical glass according to claim 1 , wherein said glass further comprises 0 to about 5% by weight of one member of the group and combinations thereof: Rb 2 O, La 2 O 3 , Y 2 O 3 , and GeO 2 .
3. The zinc-containing optical glass according to claim 2 , wherein the light transmission of the glass, determined at a wavelength of 400 nm and a 25 mm specimen thickness, is at least about 0.98.
4. The zinc-containing optical glass according to claim 3 , wherein said glass further comprises ≧0% by weight of a coloring component.
5. The zinc-containing optical glass according to claim 4 , wherein said coloring component is a member of the group and combinations thereof: CuO, Cr 2 O 3 , CoO, Fe 2 O 3 , MnO, NiO, and V 2 O 5 .
6. The zinc-containing optical glass according to claim 5 , wherein said glass comprises up to about 1% by weight of said at least one refining agent.
7. The zinc-containing optical glass according to claim 6 , wherein said glass comprises up to about 0.5% by weight of said at least one refining agent.
8. The zinc-containing optical glass according to claim 7 , wherein said at least one refining agent is at least one member of the group and combinations thereof: As 2 O 3 , and Sb 2 O 3 .
9. The zinc-containing optical glass according to claim 8 , wherein CaO plus SrO is in the range of from 0 to 5% by weight.
10. An optical filter comprising zinc-containing optical glass, wherein the zinc-containing optical glass is according to claim 1 .
11. A zinc-containing optical glass with a refractive index (n d ) being in the range of from about 1.52 to about 1.66 and an Abbe number (V d ) being substantially in the range of from about 35 to about 54, said zinc-containing optical glass consisting of, on an oxide basis, the composition of:
Percentage
Material
by weight
SiO 2
38–58
ZnO
0.3–42
PbO
>0–<30
sum of ZnO + PbO
20–55
Li 2 O
0–<3
Na 2 O
0–14
K 2 O
0–12
sum of Li 2 O + Na 2 O + K 2 O
≧2
F
0–3
MgO
0–6
CaO
0–<5
SrO
0–6
BaO
0–<0.9
B 2 O 3
0–<1
Al 2 O 3
0–<1.5
ZrO 2
0–<2
Cs 2 O
0 to about 2.5
≧0% by weight of at least one refining agent.
12. The zinc-containing optical glass according to claim 11 , wherein the sum of ZnO plus PbO is in the range of >21 to 55% by weight.
13. The zinc-containing optical glass according to claim 12 , wherein:
CaO plus SrO is in the range of from 0 to 5% by weight;
the light transmission of the glass, determined at a wavelength of 400 nm and a 25 mm specimen thickness, is at least about 0.98;
up to a total of about 1% by weight of said at least one refining agent is present; and
said at least one refining agent is at least one member of the group and combinations thereof: As 2 O 3 and Sb 2 O 3 .
14. The zinc-containing optical glass according to claim 13 , wherein up to a total of about 0.5% by weight of said at least one refining agent is present.
15. A zinc-containing optical glass with a refractive index (n d ) being in the range of from about 1.52 to about 1.66 and an Abbe number (V d ) being substantially in the range of from about 35 to about 54, said zinc-containing optical glass consisting of, on an oxide basis, the composition of:
Percentage
Material
by weight
SiO 2
38–58
ZnO
0.3–42
PbO
>0–<30
sum of ZnO + PbO
20–55
Li 2 O
0–<3
Na 2 O
0–14
K 2 O
0–12
sum of Li 2 O + Na 2 O + K 2 O
≧2
F
0–3
MgO
0–6
CaO
0–<5
SrO
0–6
BaO
0–<0.9
B 2 O 3
0–<1
Al 2 O 3
0–<1.5
ZrO 2
0–<2
Cs 2 O
0 to about 2.5;
0 to about 5% by weight of one member of the group and combinations thereof: Rb 2 O, La 2 O 3 , Y 2 O 3 , and GeO 2 ;
≧0% by weight of one member of the group and combinations thereof: CuO, Cr 2 O 3 , CoO, Fe 2 O 3 , MnO, NiO, and V 2 O 5 ; and
≧0% by weight of at least one refining agent.
16. The zinc-containing optical glass according to claim 15 , wherein the light transmission of the glass, determined at a wavelength of 400 nm and a 25 mm specimen thickness, is at least about 0.98.
17. The zinc-containing optical glass according to claim 16 , wherein said at least one refining agent is in the range of ≧0% up to about 1% by weight.
18. The zinc-containing optical glass according to claim 17 , wherein said at least one refining agent is in the range of ≧0% up to about 0.5% by weight.
19. The zinc-containing optical glass according to claim 18 , wherein said at least one refining agent is at least one member of the group and combinations thereof: As 2 O 3 and Sb 2 O 3 .
20. The zinc-containing optical glass according to claim 19 , wherein CaO plus SrO is in the range of from 0 to 5% by weight.