yazhuge |
2005-11-14 19:17 |
Optical glass
Abstract CJ/X}hi, 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. Q3n,)M[N Y l4^AR& ^W`<gR --------------------------------------------------------------------------------
"9ZID-~] Inventors: Mori, Yoshio; (Yokohama-shi, JP) ; Onozawa, Masahiro; (Sagamihara-shi, JP) j~2{lCT Correspondence Name and Address: HEDMAN & COSTIGAN P.C. y6ECdVF 1185 AVENUE OF THE AMERICAS )IP,;< NEW YORK 7]U"Z* NY Ye"o6_U" 10036 9=vMgW US $*^kY; (yu/l6[ e}D3d=6` Assignee Name and Adress: Kabushiki Kaisha Ohara iqC|G/ 1-15-30 Oyama Sagamihara-shi oz,np@f)J Kanagawa-ken I?h)OvWd JP 14Xqn8uOW 229-1186 a=1NED' TTeH` @)UZ@ ~R Serial No.: 504112 X\]L=>]C Series Code: 10 \kp8S'qVo Filed: August 10, 2004 j| v%)A PCT Filed: January 29, 2003 ]mo-rhDsM PCT NO: PCT/JP03/00839 nG,A@/N k52/w)Ro,$ U.S. Current Class: 359/883 Qiua U.S. Class at Publication: 359/883 Y'c>:;JEe Intern'l Class: G02B 005/08 S'|,oUWDb -MW_|MG HFKfkAl _K`wG}YIE -------------------------------------------------------------------------------- 9E
zj" 4E;VM{ Foreign Application Data S/}2; \Xm
txJr; -------------------------------------------------------------------------------- ]p _L) Date Code Application Number -9%:ilX~ Feb 20, 2002 JP 2002-04342 ))R5(R n)L* -------------------------------------------------------------------------------- J@^8ko & | |