Optical glass, optical preform and optical element

Patent metadata

Field	Value
Publication number	US-10160686-B2
Application number	US-201715631305-A
Country	US
Kind code	B2
Filing date	Jun 23, 2017
Priority date	Jun 24, 2016
Publication date	Dec 25, 2018
Grant date	Dec 25, 2018

Abstract

The invention provides an optical glass having excellent precision molding performance and having a refractive index of 1.46-1.53 and an Abbe number of 77-84. The optical glass comprises the following components based on cations in the molar percentage: P 5+ : 10-35%, Al 3+ : 10-35%, Ba 2+ : 1-20%, Sr 2+ : 10-35%, Ca 2+ : 1-20%, Gd 3+ : 0-10%, and Na + : 0-10%; the ratio of Sr 2+ /(Gd 3+ +Na + ) being 1-30; anions comprising F − and O 2− , wherein the ratio F − /P 5+ of F − content relative to the total molar percentage of anions to P 5+ content relative to the total molar percentage of cations is 2.5 or more. The invention by rationally adjusting the proportions of the components, the molding performance of the optical glass is improved, and the problem that glass is broken and forms fogs during the molding process is solved, thereby the yield in manufacturing optical elements is improved.

First claim

What is claimed:

1. An optical glass, comprising:
the following components (calculated by cations) in molar percentages: P 5+ : 10-35%, Al 3+ : 10-35%, Ba 2+ : 1-20%, Sr 2+ : 10-35%, Ca 2+ : 1-20%, 0<Gd 3 +10%, and 0<Na + 10%; the ratio of Sr 2+ /(Gd 3+ +Na + ) being 1-30;
anions comprising F − and O 2− , wherein a ratio F − /P 5+ of F − content relative to the total molar percentage of the anions to P 5+ content relative to the total molar percentage of the cations is 2.5 or more.

2. The optical glass according to claim 1 , further comprising the following components (calculated by based on the cations) in the molar percentages:additional cations:
Mg 2+ : 0-15%,
Y 3+ : 0-10%,
La 3+ : 0-10%,
Yb 3+ : 0-10%,
Li + : less than 4%,
K + : 0-10%,
Zn 2+ : 0-10%,
Nb 5+ : 0-10%,
Ti 4+ : 0-10%, and
Zr 4+ : 0-10%, wherein the percentages are molar percentages of the cations.

3. The optical glass according to claim 1 , wherein: P 5+ : 15-30%, and/or Al 3+ : 15-25%, Ba 2+ : 3-18%, Sr 2+ : 15-35%, Ca 2+ : 1-15%, Mg 2+ : 1-10%, Gd 3+ : 0.5-8%, Na + : 0.5-8%, Y 3+ : 0-5%, or La 3+ : 0-5%, Yb 3+ : 0-5%, Li + : less than 1%, or K + : 0-5%, Zn 2+ : 0-5%, Nb 5+ : 0-5%, and/or Ti 4+ : 0-5%, or Zr 4+ : 0-5%.

4. The optical glass according to claim 1 , wherein: P 5+ : 16-26%, Al 3+ : 18-25%, Ba 2+ : 5-15%, Sr 2+ : 20-35%, Ca 2+ : 1-10%, Mg 2+ : 1-7%, Gd 3+ : 1-5%, Na + : 1-5%, Y 3+ : 0-3%, La 3+ : 0-1%, Yb 3+ : 0-1%, K + : 0-1%, Zn 2+ : 0-1%, Nb 5+ : 0-1%, Ti 4+ : 0-1%, or Zr 4+ : 0-1%.

5. The optical glass according to claim 1 , wherein Sr 2+ /(Gd 3+ +Na + ) is 1-18, the sum of Gd 3+ +Y 3+ +La 3+ +Yb 3+ is 1-20%, 0<Na + /(Gd 3+ +Na + )≤0.8, Sr 2+ /(Gd 3+ +Y3 + ) is 3-18, or Sr 2+ >P 5+ .

6. The optical glass according to claim 1 , wherein F − /P 5+ is 2.5-5.5, Sr 2+ /(Gd 3+ +Na + ) is 2-10, the sum of Gd 3+ +Y 3+ +La 3+ +Yb 3+ is 1-10%, and/or Na + /(Gd 3+ +Na + ) is 0.2-0.7, Sr 2+ /(Gd 3+ +Y 3+ ) is 3-15, or Sr 2+ >P 5+ +1%.

7. The optical glass according to claim 1 , wherein based on the molar percentage of anions comprising: F − : 60-80%, and O 2− : 20-40%.

8. The optical glass according to claim 1 , wherein the refractive index is 1.46-1.53; the Abbe number is 77-84; the transition temperature is 470° C. or less; the resistance to moisture atmospheric stability is above Grade 2; the acid resistance stability is above Grade 2; the density is 4.30 g/cm 3 or less; when the transmittance is 80%, the corresponding wavelength λ 80 is less than or equal to 340 nm, and when the transmittance is 5%, the corresponding wavelength λ 5 is less than or equal to 290 nm.

9. An optical element, made of the optical glass according to claim 1 .

10. The optical glass according to claim 1 , wherein: P 5+ : 15-30%, Al 3+ : 15-25%, Ba 2+ : 3-18%, Sr 2+ : 15-35%, Ca 2+ : 1-15%, Mg 2+ : 1-10%, Gd 3+ : 0.5-8%, Na + : 0.5-8%, Y 3+ : 0-5%, La 3+ : 0-5%, Yb 3+ : 0-5%, Li + : less than 1%, K + : 0-5%, Zn 2+ : 0-5%, Nb 5+ : 0-5%, Ti 4+ : 0-5%, and Zr 4+ : 0-5%.

11. The optical glass according to claim 1 , wherein: P 5+ : 16-26%, Al 3+ : 18-25%, Ba 2+ : 5-15%, Sr 2+ : 20-35%, Ca 2+ : 1-10%, Mg 2+ : 1-7%, Gd 3+ : 1-5%, Na + : 1-5%, Y 3+ : 0-3%, La 3+ : 0-1%, Yb 3+ : 0-1%, K + : 0-1%, Zn 2+ : 0-1%, Nb 5+ : 0-1%, Ti 4+ : 0-1%, and Zr 4+ : 0-1%.

12. The optical glass according to claim 1 , wherein Sr 2+ /(Gd 3+ +Na + ) is 1-18, the sum of Gd 3+ +Y 3+ +La 3+ +Yb 3+ is 1-20%, 0<Na + /(Gd 3+ +Na + ) Sr 2+ /(Gd 3+ +Y 3+ ) is 3-18, and Sr 2+ >P 5+ .

13. The optical glass according to claim 1 , wherein F − /P 5+ is 2.5-5.5, Sr 2+ /(Gd 3+ +Na + ) is 2-10, the sum of Gd 3+ +Y 3+ +La 3+ +Yb 3+ is 1-10%, Na + /(Gd 3+ +Na + ) is 0.2-0.7, Sr 2+ /(Gd 3+ +Y 3+ ) is 3-15, and Sr 2+ >P 5+ +1%.

14. An optical glass, comprising the following components based on the cations in the molar percentage: P 5+ : 10-35%, Al 3+ : 10-35%, Ba 2+ : 1-20%, Sr 2+ : 10-35%, Ca 2+ : 1-20%, Mg 2+ : 0-15%, 0<Gd 3+ ≤10%, Y 3+ : 0-10%, 0<Na + ≤10%; La 3+ : 0-10%, Yb 3+ : 0-10%, Li + : less than 4%, K + : 0-10%, Zn 2+ : 0-10%, Nb 5+ : 0-10%, Ti 4+ : 0-10%, Zr 4+ : 0-10%, and 0<Na + /(Gd 3+ +Na + )≤0.8.

15. The optical glass according to claim 14 , wherein: P 5+ : 15-30%, Al 2+ : 15-25%, Ba 2+ : 3-18%, Sr 2+ : 15-35%, Ca 2+ : 1-15%, Mg 2+ : 1-10%, Gd 3+ : 0.5-8%, Na + : 0.5-8%, Y 3+ : 0-5%, La 3+ : 0-5%, Yb 3+ : 0-5%, Li + : less than 1%, K + : 0-5%, Zn 2+ : 0-5%, Nb 5+ : 0-5%, Ti 4+ : 0-5%, and Zr 4+ : 0-5%.

16. The optical glass according to claim 14 , wherein: P 5+ : 16-26%, Al 3+ : 18-25%, Ba 2+ : 5-15%, Sr 2+ : 20-35%, Ca 2+ : 1-10%, Mg 2+ : 1-7%, Gd 3+ : 1-5%, Na + : 1-5%, Y 3+ : 0-3%, La 3+ : 0-1%, Yb 3+ : 0-1%, K + : 0-1%, Zn 2+ : 0-1%, Nb 2+ : 0-1%, Ti 4+ : 0-1%, and Zr 4+ : 0-1%.

17. The optical glass according to claim 14 , wherein Sr 2+ /(Gd 3+ +Na + ) is 1-18, the sum of Gd 3+ +Y 3+ +La 3+ +Yb 3+ is 1-20%, Sr 2+ /(Gd 3+ +Y 3+ ) is 3-18, and Sr 2+ >P 5+ .

18. The optical glass according to claim 14 , wherein F − /P 5+ is 2.5-5.5, Sr 2+ /(Gd 3+ +Na+) is 2-10, the sum of Gd 3+ +Y 3+ +La 3+ +Yb 3+ is 1-10%, Na+/(Gd 3+ +Na+) is 0.2-0.7, Sr 2+ /(Gd 3+ +Y 3+ ) is 3- 15, and Sr 2+ >P 5 ++1%.

19. The optical glass according to claim 14 , wherein based on the molar percentage of anions comprising: F − : 60-80%, and O 2− : 20-40%.

20. The optical glass according to claim 14 , wherein the refractive index is 1.46-1.53; the Abbe number is 77-84; the transition temperature is 470° C. or less; the resistance to moisture atmospheric stability is above Grade 2; the acid resistance stability is above Grade 2; the density is 4.30 g/cm 3 or less; when the transmittance is 80%, the corresponding wavelength λ 80 is less than or equal to 340 nm, and when the transmittance is 5%, the corresponding wavelength λ 5 is less than or equal to 290 nm.

Assignees

• Cdgm Glass Co Ltd

Inventors

• Kuang Bo

Classifications

• G02B3/0087

  with index gradient · CPC title

• C03C3/247 Primary

  containing fluorine and phosphorus · CPC title

• G02B1/041

  Lenses · CPC title

• C03C4/085

  for ultraviolet absorbing glass · CPC title

• C03C4/08

  for glass selectively absorbing radiation of specified wave lengths · CPC title