Optical glass, optical element composed of optical glass, optical system interchangeable lens, and optical device

1. An optical glass, comprising, in terms of mol % of cations:

a total amount of La 3+ , Y 3+ , and Gd 3+ components falling within a range of from 5% to 65%; and

a total amount of Zr 4+ , Hf 4+ , and Ta 5+ components falling within a range of from 5% to 65%, wherein

a relationship expressed in Expression (1) given below is satisfied;

(La 3+ +Y 3+ +Gd 3+ )×(Zr 4+ +Hf 4+ +Ta 5+ )≥958.4(%) 2   (1).

2. The optical glass according to claim 1 , further comprising at least one component selected from a group consisting of Ga 3+ , Al 3+ , Si 4+ , B 3+ , Mg 2+ , Ca 2+ , Sr 2+ , Ba 2+ , Ti 4+ , Nb 5+ , and W 6+ .

3. The optical glass according to claim 1 , further comprising: in terms of mol % of cations,

a Ga 3+ component falling within a range of from 0% to 60%;

a Al 3+ component falling within a range of from 0% to 20%;

a Si 4+ component falling within a range of from 0% to 30%; and

a B 3+ component falling within a range of from 0% to 10%.

4. The optical glass according to claim 1 , further comprising: in terms of mol % of cations,

a Ti 4+ component falling within a range of from 0% to 20%;

a Nb 5+ component falling within a range of from 0% to 20%;

a W 6+ component falling within a range of from 0% to 10%; and

an R 2+ (R referrers to one or more selected from a group consisting of Mg, Ca, Sr, and Ba) component falling within a range of from 0% to 10%.

5. The optical glass according to claim 1 , further comprising: in terms of mol % of cations, a total amount of B 3+ and Si 4+ components is 0%.

6. The optical glass according to claim 1 , wherein a refractive index (n d ) with respect to a d-line falls within a range of from 1.93 to 2.15.

7. The optical glass according to claim 1 , wherein an abbe number (ν d ) falls within a range of from 25 to 40.

8. The optical glass according to claim 1 , wherein n d −0.01023ν d +2.2988 is 0.02 or greater.

9. An optical element comprising the optical glass according to claim 1 .

10. An optical system comprising the optical element according to claim 9 .

11. An interchangeable lens comprising the optical system according to claim 10 .

12. An optical device comprising the optical system according to claim 10 .

13. An objective lens for microscope comprising the optical element according to claim 10 .

14. The optical glass according to claim 1 , comprising: in terms of mol% of cations, a total amount of La 3+ , Y 3+ , and Gd 3+ is from 30% to 60%.

15. The optical glass according to claim 1 , comprising: in terms of mol% of cations, a total amount of La 3+ , Y 3+ , and Gd 3+ is from 40% to 55%.

16. The optical glass according to claim 1 , comprising: in terms of mol% of cations, a total amount of Zr 4+ , Hf 4+ , and Ta 5+ is from 20% to 60%.

17. The optical glass according to claim 1 , comprising: in terms of mol% of cations, a total amount of Zr 4+ , Hf 4+ , and Ta 5+ is from 30% to 60%.

18. The optical glass according to claim 1 , wherein the Expression (1) given below is satisfied:

(La 3+ +Y 3+ +Gd 3+ )×(Zr 4+ +Hf 4+ +Ta 5+ )≥1200(%) 2.

19. The optical glass according to claim 1 , wherein the Expression (1) given below is satisfied:

2400(%) 2 ≥(La 3+ +Y 3+ +Gd 3+ )×(Zr 4+ +Hf 4+ +Ta 5+ ).

20. The optical glass according to claim 1 , wherein the Expression (1) given below is satisfied:

2000(%) 2 ≥(La 3+ +Y 3+ +Gd 3+ )×(Zr 4+ +Hf 4+ +Ta 5+ ).

21. The optical glass according to claim 1 , comprising: in terms of mol% of cations, La 3+ component falling within a range of from 0% to 65%.

22. The optical glass according to claim 1 , comprising: in terms of mol% of cations, La 3+ component falling within a range of from 20% to 60%.

23. The optical glass according to claim 1 , comprising: in terms of mol% of cations, La 3+ component falling within a range of from 30% to 55%.

24. The optical glass according to claim 1 , comprising: in terms of mol% of cations, Y 3+ component falling within a range of from 0% to 10%.

25. The optical glass according to claim 1 , comprising: in terms of mol% of cations, Y 3+ component falling within a range of from 0% to 7%.

26. The optical glass according to claim 1 , comprising: in terms of mol% of cations, Y 3+ component falling within a range of from 0% to 5%.

27. The optical glass according to claim 1 , comprising: in terms of mol% of cations, Gd 3+ component falling within a range of from 0% to 20%.

28. The optical glass according to claim 1 , comprising: in terms of mol% of cations, Gd 3+ component falling within a range of from 0% to 15%.

29. The optical glass according to claim 1 , comprising: in terms of mol% of cations, Gd 3+ component falling within a range of from 0% to 10%.

30. The optical glass according to claim 1 , comprising: in terms of mol% of cations, Zr 4+ component falling within a range of from 0% to 15%.

31. The optical glass according to claim 1 , comprising: in terms of mol% of cations, Zr 4+ component falling within a range of from 0% to 10%.

32. The optical glass according to claim 1 , comprising: in terms of mol% of cations, Zr 4+ component falling within a range of from 0% to 8%.

33. The optical glass according to claim 1 , comprising: in terms of mol% of cations, Hf 4+ component falling within a range of from 0% to 10%.

34. The optical glass according to claim 1 , comprising: in terms of mol% of cations, Hf 4+ component falling within a range of from 0% to 7%.

35. The optical glass according to claim 1 , comprising: in terms of mol% of cations, Hf 4+ component falling within a range of from 0% to 5%.

36. The optical glass according to claim 1 , comprising: in terms of mol% of cations, Ta 5+ component falling within a range of from 5% to 65%.

37. The optical glass according to claim 1 , comprising: in terms of mol% of cations, Ta 5+ component falling within a range of from 10% to 50%.

38. The optical glass according to claim 1 , comprising: in terms of mol% of cations, Ta 5+ component falling within a range of from 15% to 40%.