Optical glass having negative anomalous partial dispersion / special short flint glasses

Patent metadata

Field	Value
Publication number	US-10106454-B2
Application number	US-201615355845-A
Country	US
Kind code	B2
Filing date	Nov 18, 2016
Priority date	Nov 18, 2015
Publication date	Oct 23, 2018
Grant date	Oct 23, 2018

Abstract

The present invention relates to optical glasses, in particular special short flint glasses (KZFS) and optical elements and components, which comprise these glasses, and use thereof and a method for producing such optical glasses. The optical glasses of the present invention are characterized by a pronounced short flint character and additionally by an excellent transmission and chemical resistance and workability. At that, the glasses of the invention can stand out due to lower costs of production caused by lower costs of raw materials and lower processing costs, due to their crystallization properties that can be handled also in smaller melting aggregates, and due to good environmental compatibility.

First claim

The invention claimed is:

1. An optical glass, comprising the following composition (in % by weight based on oxide):

SiO 2
≥40-47

B 2 O 3
>12-17

SiO 2 + B 2 O 3
>52-65

ZrO 2
≥10

Nb 2 O 5
   0-20

Σ R 2 O (R = Li, Na, K)
>10-14

CuO
 <0.005-.   

2. The glass according to claim 1 , wherein the glass has at least one of a refractive index n d of 1.60 to 1.625, a negatively deviating anomalous partial dispersion of ΔP g,F of at most −0.0055, and an Abbe number ν d of 42.7 to 45.9.

3. The glass according to claim 1 , wherein the glass has in sum a content of SiO 2 and B 2 O 3 of at least 54% by weight.

4. The glass according to claim 1 , wherein the glass has a content of CaO of 0-3% by weight.

5. The glass according to claim 1 , wherein the glass has at least one of a content of Li 2 O of at least 0.5 to at most 3.5, a content of Na 2 O of at least 2.0 to at most 8.0, and a content of K 2 O of at least 0.3 to at most 7.0.

6. The glass according to claim 1 , wherein the glass has a content of ZrO 2 of at most 20% by weight.

7. The glass according to claim 1 , wherein the glass has a content of Nb 2 O 5 of at least 7% by weight.

8. The glass according to claim 1 , wherein the glass is free of at least one of Ta 2 O 5 , GeO 2 and WO 3 .

9. A method of making an optical element, comprising the step of using the glass of claim 1 in the optical element.

10. The glass according to claim 1 , wherein the glass has in sum a content of SiO 2 and B 2 O 3 of at least 55% by weight.

11. The glass according to claim 1 , wherein the glass has a content of CaO of 0 to 2% by weight.

12. The glass according to claim 1 , wherein the glass has a content of CaO of 0 to 1% by weight.

13. The glass according to claim 1 , wherein the glass is free of CaO.

14. The glass according to claim 1 , wherein the glass has a content of ZrO 2 of at most 20% by weight and/or more than 12% by weight.

15. The glass according to claim 1 , wherein the glass has a content of ZrO 2 of at most 19% by weight.

16. The glass according to claim 1 , wherein the glass has a content of ZrO 2 of more than 12% by weight.

17. The glass according to claim 1 , wherein the glass has a content of ZrO 2 of at least 15% by weight.

18. The glass according to claim 1 , wherein the glass has a content of ZrO 2 of at least 16% by weight.

19. The glass according to claim 1 , wherein the glass has a content of Nb 2 O 5 of at least 9% by weight.

20. The glass according to claim 1 , wherein the glass has a content of Nb 2 O 5 of at most 16% by weight.

21. The glass according to claim 1 , wherein the glass has a content of CuO of 0.001 wt % or less.

22. An optical glass, comprising the following composition (in % by weight based on oxide):

SiO 2
≥40-47

B 2 O 3
>12-17

SiO 2 + B 2 O 3
>52-65

ZrO 2
≥16

Nb 2 O 5
   0-20

Σ R 2 O (R = Li, Na, K)
 >10-14.

Assignees

• Schott Ag

Inventors

• Ritter Simone
• Schreder Bianca
• Woelfel Ute
• Hansen Stefanie

Classifications

• C03C3/095

  containing rare earths · CPC title

• C03C3/097 Primary

  containing phosphorus, niobium or tantalum · CPC title

• C03C3/089

  containing boron · CPC title

• C03C3/093 Primary

  containing zinc or zirconium · CPC title