Infrared-transmitting glass

Abstract

Provided is a novel infrared-transmitting glass that can be vitrified without containing any environmentally harmful compound and has high light transmissivity from visible range to a mid-infrared range of wavelengths of about 4 to about 8 μm. An infrared-transmitting glass containing, in % by mole, 50% or more TeO2, 0 to 45% (exclusive of 0%) ZnO, and 0 to 50% (exclusive of 0% and 50%) RO (where R is at least one selected from the group consisting of Ca, Sr, and Ba).

1 . A cover member for an infrared sensor, the cover member comprising:
 an infrared-transmitting glass containing, in % by mole, 50% or more TeO 2 , 0 to 45% (exclusive of 0%) ZnO, and 1 to 50% (exclusive of 50%) SrO.   
     
     
         2 . The cover member for an infrared sensor according to  claim 1 , wherein the infrared-transmitting glass is substantially free of Ce, Pr, Nd, Sm, Eu, Tb, Ho, Er, Tm, Dy, Cr, Mn, Fe, Co, Cu, V, Mo, and Bi. 
     
     
         3 . The cover member for an infrared sensor according to  claim 1 , wherein the infrared-transmitting glass is substantially free of Pb, Cs, and Cd. 
     
     
         4 . An infrared sensor comprising the cover member for an infrared sensor according to  claim 1 .