Optical glass, optical element including optical glass, and optical apparatus

Patent metadata

Field	Value
Publication number	US-11236009-B2
Application number	US-201916283349-A
Country	US
Kind code	B2
Filing date	Feb 22, 2019
Priority date	Aug 26, 2016
Publication date	Feb 1, 2022
Grant date	Feb 1, 2022

Abstract

Provided is optical glass containing, in terms of mol % of cations: 10 to 60% of a La3+ component; more than 0% and up to 75% of a Ga3+ component; and 5 to 75% of a Nb5+ component, in which a total amount of the La3+ component, Ga3+ component, and Nb5+ component is 60 to 100%.

First claim

What is claimed is:

1. Optical glass containing, in terms of mol % of cations:
10 to 60% of a La 3+ component;
more than 0% and up to 75% of a Ga 3+ component; and
5 to 75% of a Nb 5+ component,
wherein a total amount of the La 3+ component, the Ga 3+ component, and the Nb 5+ component is 60 to 100%.

2. The optical glass according to claim 1 , containing, in terms of mol% of cations:
30 to 60% of a La 3+ component.

3. The optical glass according to claim 1 , containing, in terms of mol% of cations:
40 to 55% of a La 3+ component.

4. The optical glass according to claim 1 , containing, in terms of mol% of cations:
10 to 70% of a Ga 3+ component.

5. The optical glass according to claim 1 , containing, in terms of mol% of cations:
20 to 60% of a Ga 3+ component.

6. The optical glass according to claim 1 , containing, in terms of mol% of cations:
10 to 75% of a Nb 5+ component.

7. The optical glass according to claim 1 , containing, in terms of mol% of cations:
5 to 60% of a Nb 5+ component.

8. The optical glass according to claim 1 , containing, in terms of mol% of cations:
10 to 60% of a Nb 5+ component.

9. The optical glass according to claim 1 , containing, in terms of mol% of cations:
10 to 50% of a Nb 5+ component.

10. The optical glass according to claim 1 , wherein the total amount of the La 3+ component, the Ga 3+ component, and the Nb 5+ component is 80 to 100%.

11. The optical glass according to claim 1 , further containing at least one component selected from a group consisting of Ti 4+ , Zr 4+ , Hf 4+ , Ta 5+ , W 6+ , Al 3+ , B 3+ , Si 4+ , Ge 4+ , Zn 2+ , Y 3+ , Gd 3+ , Lu 3+ , Mg 2+ , Ca 2+ , Sr 2+ , and Ba 2+ .

12. The optical glass according to claim 1 , containing, in terms of mol % of cations:
0 to 30% of a B 3+ component;
0 to 20% of a Si 4+ component; and
0 to 20% of a Ge 4+ component,
wherein a total amount of the B 3+ component, the Si 4+ component, and the Ge 4+ component is 0 to 30%.

13. The optical glass according to claim 1 , wherein the total amount of the B 3+ component, the Si 4+ component, and the Ge 4+ component is 0%.

14. The optical glass according to claim 1 , containing, in terms of mol % of cations:
0 to 30% of a Ti 4+ component;
0 to 20% of a Zr 4+ component;
0 to 20% of a Hf 4+ component;
0 to 30% of a Ta 5+ component;
0 to 20% of a W 6+ component;
0 to 30% of Al 3+ component; and
0 to 20% of Zn 2+ component,
wherein a total amount of a Ln 3+ component (representing one or more of Ln=Y, Gd, and Lu) is 0 to 30%, and a total amount of a R 2+ component (representing one or more of R=Mg, Ca, Sr, and Ba) is 0 to 20%.

15. The optical glass according to claim 1 , containing, in terms of mol% of cations:
20 to 30% of a Ti 4+ component;
5 to 10% of a Zr 4+ component;
10 to 20% of Ta 5+ component; and
10 to 30% of Al 3+ component,
wherein a total amount of a Ln 3+ component (representing one or more of Ln=Y, Gd, and Lu) is 20 to 30%.

16. The optical glass according to claim 15 , wherein a total amount of a R 2+ component (representing one or more of R=Mg, Ca, Sr, and Ba) is 0%.

17. The optical glass according to claim 15 , containing, in terms of mol% of cations:
0 to 20% of a Hf 4+ component;
0 to 20% of a W 6+ component; and
0 to 20% of a Zn 2+ component.

18. The optical glass according to claim 1 , wherein a refractive index (n d ) in a d-line is 1.85 to 2.25.

19. The optical glass according to claim 1 , wherein an Abbe number (ν d ) is 19 to 37.

20. The optical glass according to claim 1 , wherein a wavelength (UVλ 5 ) at which an ultraviolet transmittance value including a surface reflection loss becomes 5% under a condition of a thickness of 1 mm is 370 nm or less.

21. The optical glass according to claim 1 , wherein a wavelength (IRλ 5 ) at which an infrared transmittance value including a surface reflection loss becomes 5% under the condition of the thickness of 1 mm is 6 μm or more.

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

23. An optical apparatus comprising the optical element according to claim 22 .

Assignees

• Univ Tokyo
• Nikon Corp

Inventors

• Inoue Hiroyuki
• Masuno Atsunobu
• Yoshimoto Kohei
• Ueda Motoi
• Yamamoto Hiroshi
• KAWASHIMA Tatsunori

Classifications

• G02B1/00

  Optical elements characterised by the material of which they are made; Optical coatings for optical elements · CPC title

• C03C3/253 Primary

  containing germanium · CPC title

• C03C3/15 Primary

  containing rare earths · CPC title

• C03C3/12 Primary

  Silica-free oxide glass compositions · CPC title

• C03C3/062

  with less than 40% silica by weight · CPC title