Near infrared cutoff filter glass

Patent metadata

Field	Value
Publication number	US-10358378-B2
Application number	US-201715818042-A
Country	US
Kind code	B2
Filing date	Nov 20, 2017
Priority date	Jul 24, 2015
Publication date	Jul 23, 2019
Grant date	Jul 23, 2019

Abstract

A near infrared cutoff filter glass, which comprises, as represented by cation percentage: P5+ 30 to 50%, Al3+ 5 to 20%, R+ 20 to 40% (wherein R+ is the total amount of Li++Na++K+), R′2+ 5 to 30% (wherein R′2+ is the total amount of Mg2++Ca2++Sr2++Ba2++Zn2+), Cu2+ 3 to 15% and comprises, as represented by anion percentage: O2− 30 to 90% and F− 10 to 70%, wherein (Li++Na++K+)/(P5++Al3+) is from 0.45 to 1.0, and (Sr2++Ba2++Cu2+)/(Al3++Mg2++Ca2+) is from 0.5 to 1.0.

First claim

What is claimed is:

1. A near infrared cutoff filter glass, which comprises, as represented by cation percentage:
P 5+ 30 to 50%,
Al 3+ 5 to 20%,
R + 20 to 40% where R + is a total amount of Li + +Na + +K + ,
R′ 2+ 5 to 30% where R′ 2+ is a total amount of Mg 2+ +Ca 2+ +Sr 2+ +Ba 2+ +Zn 2+ ,
Cu 2+ 3 to 15%
and comprises, as represented by anion percentage:
O 2− 30 to 90% and
F − 10 to 70%,
wherein (Li + +Na + +K + )/(P 5+ +Al 3+ ) is from 0.58 to 0.73, and (Sr 2+ +Ba 2+ +Cu 2+ )/(Al 3+ +Mg 2+ +Ca 2+ ) is from 0.5 to 1.0,
wherein the near infrared cutoff filter glass does not comprise Ce 4+ and Sb 3+ .

2. The near infrared cutoff filter glass according to claim 1 , which comprises, as represented by cation percentage, 0.1 to 30% of K + .

3. The near infrared cutoff filter glass according to claim 1 , which comprises, as represented by cation percentage, 20 to 30% of K + .

4. The near infrared cutoff filter glass according to claim 1 , which comprises, as represented by cation percentage, 1 to 30% of Zn 2+ .

5. The near infrared cutoff filter glass according to claim 1 , which comprises, as represented by anion percentage, 76.7 to 90% of O 2− .

6. The near infrared cutoff filter glass according to claim 1 , which comprises, as represented by anion percentage, 77.2 to 90% of O 2− .

7. The near infrared cutoff filter glass according to claim 1 , which comprises, as represented by anion percentage, 10 to 23.3% of F − .

8. The near infrared cutoff filter glass according to claim 1 , which comprises, as represented by anion percentage, 10 to 22.8% of F − .

9. The near infrared cutoff filter glass according to claim 1 , which does not comprise at least one member selected from the group consisting of Mg and S.

10. The near infrared cutoff filter glass according to claim 1 , which comprises, as represented by cation percentage:
P 5+ 30 to 48%,
Al 3+ 6 to 18%,
R + 20 to 38% where R + is the total amount of Li + +Na + +K + ,
R′ 2+ 5 to 28% where R′ 2+ is the total amount of Mg 2+ +Ca 2+ +Sr 2+ +Ba 2+ +Zn 2+ ,
Cu 2+ 3.2 to 12%
and comprises, as represented by anion percentage:
O 2− 30 to 80% and
F − 10 to 50%.

11. The near infrared cutoff filter glass according to claim 1 , which comprises, as represented by cation percentage:
P 5+ 34 to 44%,
Al 3+ 7 to 13%,
R + 24 to 36% where R + is the total amount of Li + +Na + +K + ,
R′ 2+ 10 to 20% where R′ 2+ is the total amount of Mg 2+ +Ca 2+ +Sr 2+ +Ba 2+ +Zn 2+ ,
Cu 2+ 3.4 to 9%
and comprises, as represented by anion percentage:
O 2− 30 to 75% and
F − 15 to 40%.

12. The near infrared cutoff filter glass according to claim 1 , which comprises, as represented by cation percentage:
P 5+ 36.8 to 42.1%,
Al 3+ 8 to 12.2%,
R + 29.5 to 35% where R + is the total amount of Li + +Na + +K + ,
R′ 2+ 11.3 to 14.1% where R′ 2+ is the total amount of Mg 2+ +Ca 2+ +Sr 2+ +Ba 2+ +Zn 2+ , and
Cu 2+ 4 to 9.2%.

13. The near infrared cutoff filter glass according to claim 1 , wherein in a plate thickness of from 0.05 to 0.25 mm, the wavelength at which the transmittance becomes 50% is from 600 nm to 650 nm, and the transmittance at a wavelength of 400 nm is at least 70%.

14. The near infrared cutoff filter glass according to claim 1 , wherein, in a plate thickness of from 0.05 to 0.25 mm, the transmittance at a wavelength of 400 nm is at least 84.4%.

15. The near infrared cutoff filter glass according to claim 1 , wherein in a plate thickness of from 0.05 to 0.25 mm, the transmittance at a wavelength of 400 nm is at least 85%.

16. The near infrared cutoff filter glass according to claim 1 ,
wherein
in a plate thickness of from 0.05 to 0.25 mm, the transmittance at a wavelength of 400 nm is from 85% to 89.4%.

Assignees

• Agc Inc

Inventors

• Shiratori Makoto

Classifications

• G02B5/226

  Glass filters · CPC title

• C03C3/247 Primary

  containing fluorine and phosphorus · CPC title

• C03C4/08

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

• C03C4/082

  for infrared absorbing glass · CPC title

• G02B5/208

  for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation · CPC title