OPTICAL GLASS AND OPTICAL ELEMENT

• US 20200131072A1
• Filed: 04/18/2017
• Published: 04/30/2020
• Est. Priority Date: 04/05/2017
• Status: Active Application

• Current Assignee: Sumita Optical Glass, Inc.
• Original Assignee: Sumita Optical Glass, Inc.
• Inventors: TSUCHIYA, Koichi, TAKAKU, Hideaki
• Application Number:
  US16/493,528
• Publication Number:
  US 20200131072A1
• Time in Patent Office: Days
• CPC Class Codes: C03B 37/012 Manufacture of preforms for drawing fibres or filaments
• CPC Class Codes: C03C 13/04 Fibre optics, e.g. core and clad fibre compositions light guides G02B6/00
• CPC Class Codes: C03C 13/045 Silica-containing oxide glass compositions
• CPC Class Codes: C03C 3/062 with less than 40% silica by weight
• CPC Class Codes: C03C 3/066 containing zinc
• CPC Class Codes: C03C 3/068 containing rare earths
• CPC Class Codes: C03C 3/078 containing an oxide of a divalent metal, e.g. an oxide of zinc
• CPC Class Codes: C03C 3/089 containing boron
• CPC Class Codes: C03C 3/095 containing rare earths
• CPC Class Codes: C03C 3/102 containing lead

Abstract

An optical glass is provided which does not contain components negatively affecting the environment as environmental loads, and is less colored while having a refractive index maintained moderately high. The optical glass has a composition including, in % by mass, 30% or more and 47% or less of SiO₂, 0% or more and 10% or less of B₂O₃, 3% or more and 12% or less of Na₂O, 0% or more and 5% or less of Li₂O, 0% or more and 3.8% or less of CaO, 28% or more and 43% or less of BaO, 3% or more and 16% or less of ZnO, 0% or more and 8% or less of ZrO₂, 0% or more and 15% or less of La₂O₃, where Sb₂O₃ is excluded from the composition, wherein the optical glass does not contain any of PbO, As₂O₃, and K₂O.

Claims

1. An optical glass having a composition including, in % by mass:

30% or more and 47% or less of SiO₂;

0% or more and 10% or less of B₂O₃;

3% or more and 12% or less of Na₂O;

0% or more and 5% or less of Li₂O;

0% or more and 3.8% or less of CaO;

28% or more and 43% or less of BaO;

3% or more and 16% or less of ZnO;

0% or more and 8% or less of ZrO₂; and

0% or more and 15% or less of La₂O₃,

where Sb₂O₃ is excluded from the composition,

wherein the optical glass does not contain any of PbO, As₂O₃, and K₂O.

2. The optical glass of claim 1 having a refractive index (nd) of 1.58 or higher and 1.66 or lower.

3. The optical glass of claim 1 or 2 having a coloration degree (λ

80) of 34 or lower.

4. The optical glass of claim 1 having a proportion of a content of BaO in a sum of contents of MgO, CaO, SrO, and BaO of 91% by mass or more.

5. The optical glass of claim 1 not containing any of MgO and SrO.

6. The optical glass of claim 1 containing Sb₂O₃ by 1% by mass or less exclusive to a total mass of the optical glass.

7. The optical glass of claim 1 used as a glass for optical fiber cores.

8. An optical element comprising the optical glass of claim 1.

9. The optical glass of claim 2 having a coloration degree (λ

80) of 34 or lower.

10. The optical glass of claim 2 having a proportion of a content of BaO in a sum of contents of MgO, CaO, SrO, and BaO of 91% by mass or more.

11. The optical glass of claim 2 not containing any of MgO and SrO.

12. The optical glass of claim 2 containing Sb₂O₃ by 1% by mass or less exclusive to a total mass of the optical glass.

13. The optical glass of claim 2 used as a glass for optical fiber cores.

14. An optical element comprising the optical glass of claim 2.

15. The optical glass of claim 3 having a proportion of a content of BaO in a sum of contents of MgO, CaO, SrO, and BaO of 91% by mass or more.

16. The optical glass of claim 3 not containing any of MgO and SrO.

17. The optical glass of claim 3 containing Sb₂O₃ by 1% by mass or less exclusive to a total mass of the optical glass.

18. The optical glass of claim 3 used as a glass for optical fiber cores.

19. An optical element comprising the optical glass of claim 3.

20. The optical glass of claim 4 not containing any of MgO and SrO.