公开(公告)号：US06753278B2

公开(公告)日：2004-06-22

申请号：US10137930

申请日：2002-05-02

申请人： Silke Wolff ,  Ute Woelfel ,  Ulrich Siepe

发明人： Silke Wolff ,  Ute Woelfel ,  Ulrich Siepe

IPC分类号： C03C3155

CPC分类号： C03C3/155

摘要： The optical glass has an index of refraction (nd) greater than or equal to 1.70, an Abbé number (&ngr;d) greater than or equal to 35 and a density (&rgr;) less than or equal to 4.5 g/cm3. Optical elements made with this optical glass are especially desirable in optical data transfer applications, particularly in read-write devices with movable read-write heads. The glass compositions required to make optical glass with these properties are described.

公开(公告)号：US06645894B2

公开(公告)日：2003-11-11

申请号：US10106821

申请日：2002-03-27

申请人： Michio Endo

发明人： Michio Endo

IPC分类号： C03C3155

CPC分类号： C03C3/068 ,  C03C3/155 ,  Y10S501/901

摘要： An optical glass that substantially does not contain any Ta2O5 and has high-refractivity low-dispersion optical properties and various optical parts made of such optical glass are provided stably at a low cost, and an optical part made thereof is provided, the optical glass having a glass composition comprising, by weight %, 0 to 7% of SiO2, 18 to 30% of B2O3, provided that the total content of SiO2 and B2O3 is 23 to 35%, 2 to 10% of ZnO, 30 to 50% of La2O3, 0 to 20% of Gd2O3, 0 to 20% of Y2O3, provided that the total content of La2O3, Gd2O3 and Y2O3 is 45 to 60%, 3 to 8% of ZrO2 and 3 to 12% of Nb2O5, the total content of these components being at least 95% by weight, the optical glass having a refractive index [nd] and an Abbe's number [&ngr;d] which satisfy specified relational expressions.