Abstract =bgzl=A`  
An optical glass comprising in mass %: 1 P.sub.2O.sub.5 25%-less than 45% B.sub.2O.sub.3 6-20% BaO 24%-less than 40% ZnO 3-14% MgO 0-15% CaO 0-15% SrO 0-15% Li.sub.2O 0-5% Na.sub.2O 0-5% K.sub.2O 0-5% WO.sub.3 0-5% and Al.sub.2O.sub.3 0-5%. The optical glass should preferably contain 0.1-5% WO.sub.3, 3.6-15% MgO, 0.1-5% Li.sub.2O+Na.sub.2O+K.sub.2O, 0--less than 0.5% and Sb.sub.2O.sub.3+As.sub.2O.sub.3 with the mass ratio of ZnO/BaO being 0.12--less than 0.50. The optical glass should preferably have refractive index (nd) within a range from 1.54 to 1.65 and Abbe number (.nu.d) within a range exceeding 57 up to 69 and liquid phase temperature within a range from 870.degree. C. to 930.degree. C. There is provided an optical glass having high resistance to devitrification and medium refractive index and low dispersion characteristics which is free of ingredients such as Ta.sub.2O.sub.5 having a high cost of raw material and therefore can be manufactured at a relatively low cost of raw materials. F,5~a_GP?  
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Inventors: Mori, Yoshio; (Yokohama-shi, JP) ; Onozawa, Masahiro; (Sagamihara-shi, JP)   |mvY=t %  
Correspondence Name and Address:      HEDMAN & COSTIGAN P.C. v"ZNS  
   1185 AVENUE OF THE AMERICAS (dmLEt  
   NEW YORK &y_Ya%Z3*e  
   NY "sh*,K5x|  
   10036 `Y]t*` e|  
   US [}:;B$,  
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Assignee Name and Adress: Kabushiki Kaisha Ohara ?TTtGbvU  
1-15-30 Oyama Sagamihara-shi t$~CLq5ad  
Kanagawa-ken W'lejOiw  
JP %n?&#_G|  
229-1186 %x{jmZ$}  
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Serial No.:  504112 -4wr)zjfW  
Series Code:  10   u|(;SY  
Filed:  August 10, 2004 i
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PCT Filed:  January 29, 2003 M18> 麦盖提县| 锡林郭勒盟| 兰坪| 广安市| 屏山县| 武胜县| 上林县| 安化县| 英吉沙县| 临泽县| 剑阁县| 高唐县| 两当县| 金沙县| 太和县| 定陶县| 渝北区| 平潭县| 武汉市| 信丰县| 岫岩| 灵川县| 金塔县| 凉城县| 澄迈县| 新巴尔虎右旗| 龙州县| 灵山县| 大兴区| 香港| 秦皇岛市| 遂昌县| 客服| 鄂托克旗| 阿拉善右旗| 乌兰县| 罗田县| 成武县| 襄汾县| 琼结县| 滨州市|