Near-infrared light-absorbing glass, near-infrared light-absorbing element, near-infrared light-absorbing filter, and method of manufacturing near-infrared light-absorbing formed glass article, and copper-containing glass

• US 20040082460A1
• Filed: 07/03/2003
• Published: 04/29/2004
• Est. Priority Date: 07/05/2002
• Status: Active Grant

• Current Assignee: Hoya Corporation
• Original Assignee: Hoya Corporation
• Inventors: Yamane, Rie, Zou, Xuelu, Hachitani, Youichi
• Granted Patent: US 7,192,897 B2
• Time in Patent Office: Days
• US Class Current: 501/48
• CPC Class Codes: C03C 3/16 containing phosphorus
• CPC Class Codes: C03C 3/247 containing fluorine and phosphorus
• CPC Class Codes: C03C 4/082 for infrared absorbing glass
• CPC Class Codes: G02B 5/208 for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation
• CPC Class Codes: G02B 5/226 Glass filters

Abstract

Provided are near-infrared light-absorbing glass in which good color compensating characteristics are maintained even without containing harmful arsenic, permitting the thinning of the glass, and having good weatherability and forming properties; a near-infrared light-absorbing element comprised of such glass; a near-infrared light-absorbing filter employing such glass. Also provided, at low cost, are near-infrared light-absorbing glass permitting good color compensating, a near-infrared light-absorbing element comprised of such glass, and a near-infrared light-absorbing filter comprising such elements. The glass comprises cationic components with a certain composition as well as F⁻ and O²⁻ as anionic components. Alternatively, the glass is near-infrared light-absorbing glass, wherein the glass exhibits properties, based on a thickness of 0.5 mm, in the spectral transmittance of wavelengths of 400 to 700 nm, that wavelength, at which a 50 percent transmittance is exhibited, is less than 630 nm, transmittance at a wavelength longer than said wavelength is less than 50 percent, transmittance at a wavelength shorter than said wavelength is higher than 50 percent and the viscosity at a liquid phase temperature is 0.5 Pa·s or more. The near-infrared light-absorbing element is comprised of such glass. The near-infrared light-absorbing filter comprises a glass plate comprised of such glass. Alternatively, the glass is comprised of fluorophosphate glass or phosphate glass, and comprises 0.1 weight percent or more of copper based on CuO, 0.005 to 0.5 weight percent of iron based on Fe₂O₃, 0.01 to 1 weight percent of antimony based on Sb₂O₃, and no arsenic.

Claims

1. Near-infrared light-absorbing glass comprising, denoted as cationic percentages, 23 to 41 percent of P⁵⁺, 4 to 16 percent of Al³⁺, 11 to 40 percent of Li⁺, 3 to 13 percent of Na⁺, 12 to 53 percent of R²⁺ (where R²⁺ denotes the total of Mg²⁺, Ca²⁺, Sr²⁺, Ba²⁺, and Zn²⁺), and 2.6 to 4.7 percent of Cu²⁺, and F⁻

and O²⁻

as anionic components.

2. The near-infrared light-absorbing glass according to claim 1, wherein the glass comprises Zn²⁺ as a cationic component;

3. The near infrared light-absorbing glass according to claim 1, wherein the glass comprises, denoted as anionic percentages, 25 to 48 percent of F⁻

and 52 to 75 percent of O²⁻

.

5. The near-infrared light-absorbing glass according to claim 1, wherein the glass has a liquid phase temperature of 750°

C. or less.

10. A near-infrared light-absorbing element comprised of the near-infrared light-absorbing glass according to claim 1.

13. A near-infrared light-absorbing filter comprising a glass plate comprised of the near-infrared light-absorbing glass according to claim 1.

4. Near-infrared light-absorbing glass essentially comprising no arsenic and lead, wherein,

in the spectral transmittance of wavelengths of 400 to 700 nm, a thickness of the glass, exhibiting a property that wavelength at which a 50 percent transmittance is exhibited is 615 nm, ranges from 0.1 to 0.8 mm

as well as, at a thickness at which the glass exhibits said property,

a transmittance at a wavelength of 400 nm is 80 percent or more,

a transmittance at a wavelength of 800 to 1000 nm is less than 5 percent, and p1 a transmittance at a wavelength of 1200 nm is less than 20 percent.

6. The near-infrared light-absorbing glass according to claim 4, wherein the glass has a liquid phase temperature of 750°

C. or less.

8. The near-infrared light-absorbing glass according to claim 4 which is copper-containing fluorophosphate glass.

11. A near-infrared light-absorbing element comprised of the near-infrared light-absorbing glass according to claim 4.

14. A near-infrared light-absorbing filter comprising a glass plate comprised of the near-infrared light-absorbing glass according to claim 4.

7. Near-infrared light-absorbing glass, wherein the glass exhibits properties, based on a thickness of 0.5 mm, in the spectral transmittance of wavelengths of 400 to 700 nm,

that wavelength, at which a 50 percent transmittance is exhibited, is less than 630 nm,

transmittance at a wavelength longer than said wavelength is less than 50 percent,

transmittance at a wavelength shorter than said wavelength is higher than 50 percent and

the viscosity at a liquid phase temperature is 0.5 Pa·

s or more.

9. The near-infrared light-absorbing glass according to claim 7 which is copper-containing fluorophosphate glass.

12. A near-infrared light-absorbing element comprised of the near-infrared light-absorbing glass according to claim 7.

15. A near-infrared light-absorbing filter comprising a glass plate comprised of the near-infrared light-absorbing glass according to claim 7.

16. A method of manufacturing a near-infrared light-absorbing formed glass article, wherein melted glass having a temperature of 710°

C. or less is formed and cooled to manufacture a formed glass article comprised of the near-infrared light-absorbing glass according to claim 7.

17. Copper-containing glass comprised of fluorophosphate glass or phosphate glass comprising 0.1 weight percent or more of copper based on CuO, 0.005 to 0.5 weight percent of iron based on Fe₂O₃, 0.01 to 1 weight percent of antimony based on Sb₂O₃, and no arsenic.

18. The copper-containing glass according to claim 17, wherein the glass exhibits properties, in the spectral transmittance of wavelengths of 400 to 1,200 nm, based on a thickness of 0.45 nm,

that wavelength (λ

₅₀), at which a 50 percent transmittance is exhibited, ranges from 605 to 625 nm,

transmittance at a wavelength of 400 nm is 80 percent or more, and

transmittance at a wavelength of 1200 nm is less than 22 percent.

19. The copper-containing glass according to claim 17, wherein the glass comprises, denoted as cationic percentages,

20. The copper-containing glass according to claim 19, wherein the glass does not comprise a nitrate.

21. A near-infrared light-absorbing element comprised of the copper-containing glass according to claim 17.

22. A near-infrared light-absorbing filter comprising the near-infrared light-absorbing element according to claim 21.