Low reflection glass and protective plate for display

Abstract

Provided is a low reflection glass excellent in the abrasion resistance, the weather resistance, and the productivity. A low reflection glass includes a glass substrate and an antireflection film formed on the surface of the glass substrate. The antireflection film includes an interlayer and an outermost layer. The outermost layer contains Si atoms, C atoms and O atoms, and the content of C atoms is from 0.5 to 3 mol. % based on 100 mol. % of the total amount of Si, C and O atoms. The interlayer is a high refractive index layer or a light absorbing layer. Also provides is a protective plate for a display including a support substrate including the low reflection glass and a conductive film provided on a side where no antireflection film is formed of the support substrate.

1 . A low reflection glass comprising a glass substrate and an antireflection film formed on the surface of the glass substrate,
 wherein the antireflection film comprises an interlayer and an outermost layer disposed in this order from the glass substrate side; and   the outermost layer is a layer containing Si atoms, C atoms and O atoms, the content of C atoms being from 0.5 to 3 mol % based on 100 mol % of the total amount of Si atoms, C atoms and O atoms, and   the interlayer is the following layer (a) or layer (b):   layer (a): a layer having an extinction coefficient K 1  at a wavelength of from 380 to 780 nm of 0≦K 1 <0.1 and a refractive index n 1  at a wavelength of 550 nm of 2.0≦n 1 ≦2.5;   layer (b): a layer having an extinction coefficient K 2  at a wavelength of from 380 to 780 nm of 0.1≦K 2 ≦2.4 and a refractive index n 2  at a wavelength of from 380 to 780 nm of 0.5≦n 2 ≦2.5, and K 2p <K 2q  and n 2p >n 2q  being satisfied, where the extinction coefficients K 2  at wavelengths of p and q which satisfy 380 nm≦p<q≦780 nm are K 2p  and K 2q , respectively, and the refractive indices n 2  at wavelengths of p and q are n 2p  and n 2q , respectively.   
     
     
         2 . The low reflection glass according to  claim 1 , wherein the outermost layer is a layer containing SiO 2  as the main component. 
     
     
         3 . The low reflection glass according to  claim 1 , wherein the outermost layer has a refractive index of at least 1.45 and less than 1.5 at a wavelength of 550 nm. 
     
     
         4 . The low reflection glass according to  claim 1 , wherein the antireflection film is a film having the layer (b) and the outermost layer disposed in this order from the glass substrate side. 
     
     
         5 . The low reflection glass according to  claim 2 , wherein the antireflection film is a film having the layer (b) and the outermost layer disposed in this order from the glass substrate side. 
     
     
         6 . The low reflection glass according to  claim 3 , wherein the antireflection film is a film having the layer (b) and the outermost layer disposed in this order from the glass substrate side. 
     
     
         7 . The low reflection glass according to  claim 4 , wherein the layer (b) contains Ti atoms and N atoms as the main components, the proportion of Ti atoms and N atoms being TiN x  (x=0.5 to 1.0). 
     
     
         8 . The low reflection glass according to  claim 5 , wherein the layer (b) contains Ti atoms and N atoms as the main components, the proportion of Ti atoms and N atoms being TiN x  (x=0.5 to 1.0). 
     
     
         9 . The low reflection glass according to  claim 6 , wherein the layer (b) contains Ti atoms and N atoms as the main components, the proportion of Ti atoms and N atoms being TiN x  (x=0.5 to 1.0). 
     
     
         10 . A protective plate for a display, comprising the low reflection glass as defined in  claim 1 . 
     
     
         11 . A protective plate for a display, comprising the low reflection glass as defined in  claim 4 . 
     
     
         12 . A protective plate for a plasma display, comprising a support substrate comprising the low reflection glass as defined in  claim 1 , and a conductive film provided on a side on which no antireflection film is formed of the support substrate. 
     
     
         13 . A protective plate for a plasma display, comprising a support substrate comprising the low reflection glass as defined in  claim 4 , and a conductive film provided on a side on which no antireflection film is formed of the support substrate. 
     
     
         14 . The low reflection glass according to  claim 1 , wherein the antireflection film further comprises at least one middle reflective layer disposed between the glass substrate side and the interlayer. 
     
     
         15 . A low reflection glass comprising a glass substrate and an antireflection film formed on the surface of the glass substrate,
 wherein the antireflection film comprises at least two interlayers and an outermost layer disposed in this order from the glass substrate side; and   the outermost layer is a layer containing Si atoms, C atoms and O atoms, the content of C atoms being from 0.5 to 3 mol % based on 100 mol % of the total amount of Si atoms, C atoms and O atoms, and   the at least two interlayers can be the same or different and are selected form the group consisting of the following layer (a) and layer (b):   layer (a): a layer having an extinction coefficient K 1  at a wavelength of from 380 to 780 nm of 0≦K 1 <0.1 and a refractive index n 1  at a wavelength of 550 nm of 2.0≦n 1 ≦2.5;   layer (b): a layer having an extinction coefficient K 2  at a wavelength of from 380 to 780 nm of 0.1≦K 2 ≦2.4 and a refractive index n 2  at a wavelength of from 380 to 780 nm of 0.5≦n 2 ≦2.5, and K 2p <K 2q  and n 2p >n 2q  being satisfied, where the extinction coefficients K 2  at wavelengths of p and q which satisfy 380 nm≦p<q≦780 nm are K 2p  and K 2q , respectively, and the refractive indices n 2  at wavelengths of p and q are n 2p  and n 2q , respectively.   
     
     
         16 . The low reflection glass according to  claim 15 , wherein the antireflection film further comprises at least one middle reflective layer disposed between the glass substrate side and the at least two interlayers. 
     
     
         17 . The low reflection glass according to  claim 15 , wherein the antireflection film further comprises at least one middle reflective layer disposed between the at least two interlayers. 
     
     
         18 . The low reflection glass according to  claim 15 , wherein the antireflection film comprises at least two different interlayers. 
     
     
         19 . The low reflection glass according to  claim 15 , wherein the antireflection film comprises at least two layers (b). 
     
     
         20 . A protective plate for a display, comprising the low reflection glass as defined in  claim 15 . 
     
     
         21 . A protective plate for a plasma display, comprising a support substrate comprising the low reflection glass as defined in  claim 15 , and a conductive film provided on a side on which no antireflection film is formed of the support substrate.