US2005209085A1PendingUtilityA1

Optical glass, press-molding glass gob and optical element

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Assignee: HOYA CORPPriority: Dec 27, 2002Filed: Jun 1, 2005Published: Sep 22, 2005
Est. expiryDec 27, 2022(expired)· nominal 20-yr term from priority
Inventors:Michio Endo
C03C 3/066C03C 3/15C03C 3/155C03C 3/068
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Claims

Abstract

An optical glass whose refractive index is high and whose coloring is decreased comprising, by weight %, 2 to 45% of B 2 O 3 , 0 to 30% of SiO 2 provided that the content of B 2 O 3 >the content of SiO 2 , 10 to 50% of La 2 O 3 , 0 to 30% of TiO 2 , 0 to 15% of ZnO, 0 to 15% of ZrO 2 , 0 to 35% of Nb 2 O 5 , 0 to 35% of BaO, 0 to 5% of SrO, 0% or more but less than 8% of CaO, 0% or more but less than 13% of Mgo, provided that the total content of BaO, SrO, CaO and MgO is 0 to 40%, 0 to 20% of Gd 2 O 3 , 0 to 15% of Y 2 O 3 , 0 to 18% of Ta 2 O 5 , 0% or more but less than 0.5% of WO 3 , 0% or more but less than 1.5% of a total of Na 2 O, K 2 O and Li 2 O, 0 to 10% of GeO 2 , 0 to 20% of Bi 2 O 3 , 0 to 10% of Yb 2 O 3 , 0 to 10% of Al 2 O 3 , 0% or more but less than 2% of Sb 2 O 3 and 0 to 1% of SnO 2 .

Claims

exact text as granted — not AI-modified
1 . An optical glass comprising, by weight %, 2 to 45% of B 2 O 3 , 0 to 30% of SiO 2  provided that the content of B 2 O 3 >the content of SiO 2 , 10 to 50% of La 2 O 3 , 0 to 30% of TiO 2 , 0 to 15% of ZnO, 0 to 15% of ZrO 2 , 0 to 35% of Nb 2 O 5 , 0 to 35% of BaO, 0 to 5% of SrO, 0% or more but less than 8% of CaO, 0% or more but less than 13% of MgO, provided that the total content of BaO, SrO, CaO and MgO is 0 to 40%, 0 to 20% of Gd 2 O 3 , 0 to 15% of Y 2 O 3 , 0 to 18% of Ta 2 O 5 , 0% or more but less than 0.5% of WO 3 , 0% or more but less than 1.5% of a total of Na 2 O, K 2 O and Li 2 O, 0 to 10% of GeO 2 , 0 to 20% of Bi 2 O 3 , 0 to 10% of Yb 2 O 3 , 0 to 10% of Al 2 O 3 , 0% or more but less than 2% of Sb 2 O 3  and 0 to 1% of SnO 2 .  
     
     
         2 . The optical glass of  claim 1 , which has an refractive index (nd) of 1.8 to 2.1 and an Abbe's number (νd) of 2.0.to 40.  
     
     
         3 . The optical glass of  claim 1 , which contains 2 to 45% of B 2 O 3 , 0 to 30% of SiO 2 , provided that the content of B 2 O 3 >the content of SiO 2 , 10 to 50% of La 2 O 3 , 0 to 30% of TiO 2 , 0 to 15% of ZnO, 0 to 15% of ZrO 2 , 0 to 35% of Nb 2 O 5 , 0 to 35% of BaO, 0 to 5% of SrO, 0% or more but less than 8% of CaO, 0% or more but less than 13% of MgO, provided that the total content of BaO, SrO, CaO and MgO is 0 to 40%, 0 to 20% of Gd 2 O 3 , 0 to 15% of Y 2 O 3 , 0 to 18% of Ta 2 O 5 , 0% or more but less than 0.5% of WO 3 , 0% or more but less than 1.5% of a total of Na 2 O, K 2 O and Li 2 O, 0 to 10% of GeO 2 , 0 to 20% of Bi 2 O 3 , 0 to 10% of Yb 2 O 3 , 0 to 10% of Al 2 O 3 , 0% or more but less than 2% of Sb 2 O 3  and 0 to 1% of SnO 2 , and has a refractive index of more than 1.86 but up to 2.1, wherein the optical glass exhibits λ 70  at 460 nm or less.  
     
     
         4 . The optical glass of  claim 1 , which contains 2 to 45% of B 2 O 3 , 0 to 30% of SiO 2 , provided that the content of B 2 O 3 >the content of SiO 2 , 10 to 50% of La 2 O 3 , 0 to 30% of TiO 2 , 0 to 15% of ZnO, 0 to 15% of ZrO 2 , 0 to 35% of Nb 2 O 5 , 0 to 35% of BaO, 0% or more but less than 2% of SrO, 0% or more but less than 8% of CaO, 0% or more but less than 13% of MgO, provided that the total content of BaO, SrO, CaO and MgO is 0 to 40%, 0 to 20% of Gd 2 O 3 , 0 to 15% of Y 2 O 3 , 0 to 18% of Ta 2 O 5 , 0% or more but less than 0.5% of WO 3 , 0% or more but less than 1.5% of a total of Na 2 O, K 2 O and Li 2 O, 0 to 10% of GeO 2 , 0 to 20% of Bi 2 O 3 , 0 to 10% of Yb 2 O 3 , 0 to 10% of Al 2 O 3 , 0% or more but less than 2% of Sb 2 O 3  and 0 to 1% of SnO 2 , and has a refractive index of 1.8 to 1.86, wherein the optical glass exhibits λ 70  at 460 nm or less.  
     
     
         5 . The optical glass of  claim 1 , which contains 2 to 45% of B 2 O 3 , 0 to 30% of SiO 2 , provided that the content of B 2 O 3 >the content of SiO 2 , 10 to 50% of La 2 O 3 , 0 to 30% of TiO 2 , 0 to 15% of ZnO, 0 to 15% of ZrO 2 , 0 to 35% of Nb 2 O 5 , 0 to 35% of BaO, 0% or more but less than 1% of SrO, 0% or more but less than 8% of CaO, 0% or more but less than 13% of MgO, provided that the total content of BaO, SrO, CaO and MgO is 0 to 40%, 0 to 20% of Gd 2 O 3 , 0 to 15% of Y 2 O 3 , 0 to 18% of Ta 2 O 5 , 0% or more but less than 0.5% of WO 3 , 0% or more but less than 1.5% of a total of Na 2 O, K 2 O and Li 2 O, 0 to 10% of GeO 2 , 0 to 20% of Bi 2 O 3 , 0 to 10% of Yb 2 O 3 , 0 to 10% of Al 2 O 3 , 0% or more but less than 2% of Sb 2 O 3  and 0 to 1% of SnO 2 , and has a refractive index of 1.8 to 2.1, wherein the optical glass exhibits λ 70  at 460 nm or less.  
     
     
         6 . The optical glass of  claim 1 , which contains 2 to 45% of B 2 O 3 , 0 to 30% of SiO 2 , provided that the content of B 2 O 3 >the content of SiO 2 , 10 to 50% of La 2 O 3 , 0 to 30% of TiO 2 , 0 to 15% of ZnO, 0 to 15% of ZrO 2 , 0 to 35% of Nb 2 O 5 , 0 to 35% of BaO, 0 to 0.8% of SrO, 0 to 7% of CaO, 0 to 12% of MgO, provided that the total content of BaO, SrO, CaO and MgO is 0 to 40%, 0 to 20% of Gd 2 O 3 , 0 to 15% of Y 2 O 3 , 0 to 18% of Ta 2 O 5 , 0 to 0.4% of WO 3 , 0 to 1.2% of a total of Na 2 O, K 2 O and Li 2 O, 0 to 10% of GeO 2 , 0 to 20% of Bi 2 O 3 , 0 to 10% of Yb 2 O 3 , 0 to 10% of Al 2 O 3 , 0 to 1.8% of Sb 2 O 3  and 0 to 1% of SnO 2 , wherein the optical glass exhibits λ 70  at 460 nm or less.  
     
     
         7 . The optical glass of  claim 1 , which contains 2 to 45% of B 2 O 3 , 0 to 30% of SiO 2 , provided that the content of B 2 O 3 >the content of SiO 2 , 10 to 50% of La 2 O 3 , 0 to 30% of TiO 2 , 0 to 15% of ZnO, 0 to 15% of ZrO 2 , 0 to 35% of Nb 2 O 5 , 0 to 35% of BaO, 0% or more but less than 1% of SrO, 0% or more but less than 8% of CaO, 0% or more but less than 13% of MgO, provided that the total content of BaO, SrO, CaO and MgO is 0 to 40%, 0 to 20% of Gd 2 O 3 , 0% or more but less than 2% of Y 2 O 3 , 0 to 18% of Ta 2 O 5 , 0% or more but less than 0.5% of WO 3 , 0% or more but less than 1.5% of a total of Na 2 O, K 2 O and Li 2 O, 0 to 10% of GeO 2 , 0 to 20% of Bi 2 O 3 , 0 to 10% of Yb 2 O 3 , 0 to 10% of Al 2 O 3 , 0% or more but less than 2% of Sb 2 O 3  and 0 to 1% of SnO 2 .  
     
     
         8 . The optical glass of  claim 7 , which contains 3 to 24% of B 2 O 3 , 0 to 18% of SiO 2 , provided that the weight ratio of the content of B 2 O 3 /the content of Sio 2  is at least 1.1 or that no SiO 2  is contained, 18 to 47% of La 2 O 3 , 0 to 26% of TiO 2 , 0 to 12% of ZnO, 0 to 10% of ZrO 2 , 0 to 30% of Nb 2 O 5 , 0 to 32% of BaO, 0 to 10% of Gd 2 O 3  and 0 to 4% of Yb 2 O 3 .  
     
     
         9 . The optical glass of  claim 7  or  8 , which contains 1 to 5% of ZnO.  
     
     
         10 . The optical glass of  claim 1 , wherein the total content of B 2 O 3 , SiO 2 , La 2 O 3 , ZnO, ZrO 2 , Nb 2 O 5 , TiO 2 , BaO, CaO, SrO, Gd 2 O 3 , Y 2 O 3 , Ta 2 O 5 , WO 3 , Na 2 O, K 2 O, Li 2 O, GeO 2 , Yb 2 O 3 , Sb 2 O 3  and SnO 2  is 99% or more.  
     
     
         11 . The optical glass of  claim 10 , wherein the total content of B 2 O 3 , SiO 2 , La 2 O 3 , ZnO, ZrO 2 , Nb 2 O 5 , TiO 2 , BaO and Sb 2 O 3  is 99% or more.  
     
     
         12 . The optical glass of  claim 11 , which contains all of B 2 O 3 , SiO 2 , La 2 O 3 , ZnO, ZrO 2 , Nb 2 O 5 , TiO 2  and BaO.  
     
     
         13 . The optical glass of  claim 1 , which contains TiO 2 .  
     
     
         14 . A press-molding glass gob which is formed of the optical glass recited in  claim 1  and is to be softened under heat and press-molded.  
     
     
         15 . An optical element formed of the optical glass recited in  claim 1.

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