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

Patent metadata

Field	Value
Publication number	US-12466759-B2
Application number	US-202117523515-A
Country	US
Kind code	B2
Filing date	Nov 10, 2021
Priority date	Sep 21, 2017
Publication date	Nov 11, 2025
Grant date	Nov 11, 2025

Abstract

An optical glass includes, 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%, and a relationship expressed in Expression (1) given below is satisfied. (La 3+ +Y 3+ +Gd 3+ )×(Zr 4+ +Hf 4+ +Ta 5+ )≥400(%) 2 .

First claim

What is claimed is:

1 . An optical glass, comprising:
in terms of mol % of cations,
a Ta 5+ component falling within a range of 0% to 20%,
a total amount of La 3+ , Y 3+ , and Gd 3+ components falling within a range of 5% to 65%; and
a total amount of Zr 4+ , Hf 4+ , and Ta 5+ components falling within a range of 24.8% 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+ )≥400(%) 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 0% to 60%;
a Al 3+ component falling within a range of 0% to 20%;
a Si 4+ component falling within a range of 0% to 30%; and
a B 3+ component falling within a range of 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 0% to 20%;
a Nb 5+ component falling within a range of 0% to 20%;
a W 6+ component falling within a range of 0% to 0%; and
an R 2+ (R refers to one or more selected from a group consisting of Mg, Ca, Sr, and Ba) component falling within a range of 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 , comprising: in terms of mol % of cations, a total amount of La 3+ , Y 3+ , and Gd 3+ is 30% to 60%.

7 . 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 40% to 55%.

8 . 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 30% to 60%.

9 . 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+ )≥800(%) 2 .

10 . 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 .

11 . 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+ ).

12 . 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+ ).

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

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

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

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

17 . The optical glass according to claim 1 , comprising: in terms of mol % of cations, Gd 3+ component falling within a range of 7.65% to 20%.

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

19 . The optical glass according to claim 1 , comprising: in terms of mol % of cations, Zr 4+ component falling within a range of 4.21% to 15%.

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

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

22 . The optical glass according to claim 1 , comprising: in terms of mol % of cations, Ta 5+ component falling within a range of 5% to 20%.

23 . The optical glass according to claim 1 , comprising: in terms of mol % of cations, Ta 5+ component falling within a range of 10% to 20%.

24 . The optical glass according to claim 1 , comprising: in terms of mol % of cations, Ta 5+ component falling within a range of 15% to 20%.

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

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

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

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

29 . An optical system comprising the optical element according to claim 28 .

30 . An interchangeable lens comprising the optical system according to claim 29 .

31 . An objective lens for microscope comprising the optical element according to claim 29 .

32 . An optical device comprising the optical system according to claim 29 .

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

Assignees

• Nikon Corp

Inventors

• Yoshimoto Kohei
• Ueda Motoi
• Yamamoto Hiroshi
• KAWASHIMA Tatsunori

Classifications

• C03C3/155 Primary

  containing zirconium, titanium, tantalum or niobium · CPC title

• C03C2201/36

  containing rare earth metals and aluminium, e.g. Er-Al co-doped · CPC title

• C03C2201/3452

  Gadolinium · CPC title

• C03C2201/3417

  Lanthanum · CPC title

• C03C2201/3411

  Yttrium · CPC title