Optical glass for precision molding, prefabricated glass, optical element and optical instrument
The invention provides a low-cost high-precision molding optical glass, with density below 4.54 g/cm 3 , refractive index ranging from 1.85 to 1.95, Abbe number ranging from 25 to 35 and transition temperature lower than 610° C. Expensive Ta 2 O 5 is not added in the invention, so the production cost is saved, and resource saving is realized; the combination of B 2 O 3 and La 2 O 3 effectively improves the devitrification resistance and the chemical stability of glass; the combination of WO 3 and TiO 2 allows the staining degree of the optical glass to be excellent; and the combination of Gd 2 O 3 and La 2 O 3 effectively improves the devitrification resistance of the glass.
1. A high-precision molding optical glass, not comprising Ta 2 O 5 , with density below 4.54 g/cm3, refractive index ranging from 1.87 to 1.95, Abbe number ranging from 25 to 35 and transition temperature lower than 610° C., comprising 12 to 22% of B 2 O 3 , 25 to 40% of La 2 O 3 , 5 to 12% of ZnO, 5 to 15% of TiO 2 , 5 to 15% of Nb 2 O 5 , 1 to 10% of ZrO 2 , 0 to 5% of GeO, 2 to 10% of SiO 2 , 3 to 15% of Gd 2 O 3 , 1 to 8% of WO 3 and 0.1 to 1% of Li 2 O.
2. The high-precision molding optical glass according to claim 1 , wherein SiO 2 accounts for 3 to 8%.
3. The high-precision molding optical glass according to claim 1 , wherein B 2 O 3 accounts for 15 to 20% and La 2 O 3 accounts for 30 to 40%.
4. The high-precision molding optical glass according to claim 1 , wherein ZnO accounts for 5 to 10%.
5. The high-precision molding optical glass according to claim 1 , wherein TiO 2 accounts for 6 to 12% and WO 3 accounts for 1 to 5%.
6. The high-precision molding optical glass according to claim 1 , wherein the content of TiO 2 is greater than 8% but less than or equal to 12%.
7. The high-precision molding optical glass according to claim 1 , wherein Gd 2 O 3 accounts for 5 to 10% and La 2 O 3 accounts for 30 to 40%.
8. The high-precision molding optical glass according to claim 1 , wherein the content of Gd 2 O 3 is greater than 5% but less than or equal to 10%.
9. The high-precision molding optical glass according to claim 1 , wherein the total content of Gd 2 O 3 and La 2 O 3 is 36 to 45%.
10. The high-precision molding optical glass according to claim 1 , wherein ZrO 2 accounts for 3 to 8%, GeO 2 accounts for 0 to 2%, Nb 2 O 5 accounts for 8 to 14% and Li 2 O accounts for 0.5 to 1%.
11. The high-precision molding optical glass according to claim 1 , wherein the total content of SiO 2 , B 2 O 3 , La 2 O 3 , ZrO 2 , ZnO, TiO 2 , Gd 2 O 3 , Nb 2 O 5 , WO 3 and Li 2 O is greater than 95%.
12. The high-precision molding optical glass according to claim 1 , wherein the total content of SiO 2 , B 2 O 3 , La 2 O 3 , ZrO 2 , ZnO, TiO 2 , Gd 2 O 3 , Nb 2 O 5 and Li 2 O is greater than 93%.
13. A high-precision molding optical glass, comprising by weight percentage as follows: 2 to 10% of SiO 2 , 12 to 22% of B 2 O 3 , 25 to 40% of La 2 O 3 , 1 to 10% of ZrO 2 , 5 to 12% of ZnO, 5 to 15% of TiO 2 , 0 to 5% of GeO 2 , 3 to 15% of Gd 2 O 3 , 5 to 15% of Nb 2 O 5 , 1 to 8% of WO 3 and 0.1 to 1% of Li 2 O, and having a refractive index ranging from 1.87to 1.95.
14. The high-precision molding optical glass according to claim 13 , wherein SiO 2 accounts for 3 to 8%.
15. The high-precision molding optical glass according to claim 13 , wherein B 2 O 3 accounts for 15 to 20% and La 2 O 3 accounts for 30 to 40%.
16. The high-precision molding optical glass according to claim 13 , wherein ZrO 2 accounts for 3 to 8%.
17. The high-precision molding optical glass according to claim 13 , wherein ZnO accounts for 5 to 10%.
18. The high-precision molding optical glass according to claim 13 , wherein TiO 2 accounts for 6 to 12% and WO 3 accounts for 1 to 5%.
19. The high-precision molding optical glass according to claim 13 , wherein the content of TiO 2 is greater than 8% but less than or equal to 12%.
20. The high-precision molding optical glass according to claim 13 , wherein GeO 2 accounts for 0 to 2%.
21. The high-precision molding optical glass according to claim 13 , wherein Gd 2 O 3 accounts for 5 to 10% and La 2 O 3 accounts for 30 to 40%.
22. The high-precision molding optical glass according to claim 13 , wherein the content of Gd 2 O 3 is greater than 5% but less than or equal to 10%.
23. The high-precision molding optical glass according to claim 13 , wherein the total content of Gd 2 O 3 and La 2 O 3 is 36 to 45%.
24. The high-precision molding optical glass according to claim 13 , wherein Nb 2 O 5 accounts for 8 to 14%.
25. The high-precision molding optical glass according to claim 13 , wherein Li 2 O accounts for 0.5 to 1%.
26. The high-precision molding optical glass according to claim 13 , wherein the total content of SiO 2 , B 2 O 3 , La 2 O 3 , ZrO 2 , ZnO, TiO 2 , Gd 2 O 3 , Nb 2 O 5 , WO 3 and Li 2 O is greater than 95%.
27. The high-precision molding optical glass according to claim 13 , wherein the total content of SiO 2 , B 2 O 3 , La 2 O 3 , ZrO 2 , ZnO, TiO 2 , Gd 2 O 3 , Nb 2 O 5 and Li 2 O is greater than 93%.
28. A glass preform made of said high-precision molding optical glass according to claim 1 .
29. An optical element made of said high-precision molding optical glass according to claim 1 .
30. An optical apparatus made of said high-precision molding optical glass according to claim 1 .