Optical glass and optical element

Patent metadata

Field	Value
Publication number	US-9950947-B2
Application number	US-201515025763-A
Country	US
Kind code	B2
Filing date	Jan 16, 2015
Priority date	Jan 23, 2014
Publication date	Apr 24, 2018
Grant date	Apr 24, 2018

Abstract

The invention provides an optical glass with rather low transition temperature, high transmittance, chemical stability and good devitrification resistance, wherein the refractive index is 1.60-1.65 and the Abbe number is 62-66. The optical glass comprises, by weight percentage, 30-50% of P 2 O 5 , 35-50% of BaO, 2-6% of B 2 O 3 , 0-5% of La 2 O 3 , 0-5% of Gd 2 O 3 , 0.1-5% of Al 2 O 3 , 0.1-5% of Li 2 O, 2-10% of MgO, and 2-10% of CaO. According to the present invention, P 2 O 5 is applied as the network generation body of glass so as to give high transmittance to the glass; a large amount of BaO is a key component for improving the transmittance of glass while improving the refractive index and weather durability of glass, and also the advantages of low transition temperature, good chemical stability and good devitrification resistance are provided.

First claim

The invention claimed is:

1. An optical glass, comprising the following components by weight percentage: 30-50% of P 2 O 5 , 39-50% of BaO, 2-4.5% of B 2 O 3 , 0.4-5% of La 2 O 3 , 0-5% of Gd 2 O 3 , 0.1-5% of Al 2 O 3 , 0.1-5% of Li 2 O, 2-10% of MgO, and 2-10% of CaO; wherein
0.9≤BaO/(P 2 O 5 +B 2 O 3 )≤1.5.

2. The optical glass according to claim 1 , wherein the content of P 2 O 5 is 38-42%.

3. The optical glass according to claim 1 , wherein the content of BaO is 39-45%.

4. The optical glass according to claim 1 , wherein the content of B 2 O 3 is 2.5-4.5%.

5. The optical glass according to claim 1 , wherein the content of Al 2 O 3 is 1-5%.

6. The optical glass according to claim 1 , wherein the content of Li 2 O is 1-3%.

7. The optical glass according to claim 1 , wherein the content of MgO is 4-8%.

8. The optical glass according to claim 1 , wherein the content of CaO is 4-8%.

9. The optical glass according to any claim 1 , wherein the content of Gd 2 O 3 is 0-3% and/or the content of La 2 O 3 is 0.4-3%.

10. The optical glass according to claim 1 , wherein
1.1%≤La 2 O 3 +Gd 2 O 3 ≤8%.

11. The optical glass according to claim 1 , further comprising: 0-3% of ZnO, 0-8% of SrO and 0-0.5% of Sb 2 O 3 .

12. The optical glass according to claim 1 , wherein the refractive index of optical glass is 1.60-1.65 and the Abbe number is 62-66.

13. The optical glass according to claim 1 , wherein the optical glass has a transmittance of 80% or more at a wavelength less than 370 nm, the water durability DW of the optical glass is type 1, the acid resistance DA is type 4, the weather durability is type 1, and the transition temperature does not exceed 550° C.

14. A glass preform made of the optical glass according to claim 1 .

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

16. An optical instrument made of the optical glass according to claim 1 .

17. An optical glass consisting of the following components by weight percentage: 30-50% of P 2 O 5 , 39-50% of BaO, 0.4-5% of La 2 O 3 , 0-5% of Gd 2 O 3 , 2-4.5% of B 2 O 3 , 0.1-5% of Al 2 O 3 , 0.1-5% of Li 2 O, 2-10% of MgO, 2-10% of CaO, 0-3% of ZnO, 0-8% of SrO and 0-0.5% of Sb 2 O 3 ; wherein
0.9≤BaO/(P 2 O 5 +B 2 O 3 )≤1.5.

Assignees

• Cdgm Glass Co Ltd

Inventors

• Kuang Bo

Classifications

• G02B1/041

  Lenses · CPC title

• C03C3/17

  containing aluminium or beryllium · CPC title

• C03C3/19 Primary

  containing boron · CPC title

• Y10S501/903

  having refractive index less than 1.8 and ABBE number less than 70 · CPC title

• G02B3/02

  with non-spherical faces (G02B3/10 takes precedence) · CPC title