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    • 4. 发明申请
    • Optical glass, glass material for press molding, optical element, and method of manufacturing same
    • US20060105897A1
    • 2006-05-18
    • US11315317
    • 2005-12-23
    • Yoshiko KasugaKazuo TachiwanaHiroaki Yanagita
    • Yoshiko KasugaKazuo TachiwanaHiroaki Yanagita
    • C03C10/14
    • C03C3/062Y10S501/901
    • Disclosed is an optical glass comprising, expressed as weight percentages, greater than or equal to 18 percent and less than 30 percent of SiO2, greater than or equal to 12 percent and less than 23 percent of BaO, 22 to 37 percent TiO2, greater than or equal to 7 percent and less than 16 percent Nb2O5, 5 to 20 percent of Na2O, 0 to 6 percent of K2O, 0 to 5 percent of CaO, 0 to 5 percent of SrO, 0 to 4 percent of ZrO2, 0 to 3 percent of Ta2O5, 0 to 1 percent of Sb2O5, and greater than or equal to 0 percent and less than 0.5 percent of P2O5, and by essentially not comprising PbO, As2O3, and F. The optical glass exhibits a refractive index (nd) greater than or equal to 1.80 and an Abbé number (vd) less than or equal to 30. A method of manufacturing a glass material for press molding is disclosed. This method comprises the steps of melting the glass starting materials, forming the glass melt obtained, and annealing the formed glass and is characterized in that: the glass melt has a composition such that, (1) when rapidly cooled to room temperature, said glass melt becomes glass that has a scattering coefficient of less than 0.005 cm−1 at wavelengths of from 400 to 2,500 nm or comprises crystals with a volumetric ratio of less than 10−6, and (2) when maintained for three hours at a temperature 10° C. higher than the glass transition temperature, maintained for 10 min at a temperature yielding a viscosity of 104.5 to 103.5 dPa·s, and then rapidly cooled to room temperature, said glass melt becomes glass that has a scattering coefficient at at least one wavelength from 400 to 2,500 nm of greater than 0.01 cm−1 or comprises crystals with a volumetric ratio of greater than 10−5; and an annealing of said formed glass is conducted at a temperature lower than the glass transition temperature.
    • 8. 发明授权
    • Ophthalmic and optical glasses
    • 眼科眼镜
    • US06187702B1
    • 2001-02-13
    • US09409012
    • 1999-09-29
    • Michiko Morishita
    • Michiko Morishita
    • C03C3066
    • C03C3/068Y10S501/901
    • Ophthalmic and optical glasses have a composition in weight percent of 4.5-9.5% SiO2, 10-19.5% B2O3, 0-3% Al2O3, 0-5% GeO2, 18—less than 23% La2O3, 0.3—less than 2% Gd2O3, 5.5-13.5% TiO2, 0-7.5% ZrO2, 15-21% Nb2O5, 0-1.5% Ta2O5, 0.3-5% WO3, with the proviso that (Ta2O5+WO3)/B2O3 is 0.5 or below in the ration terms of weight, 2.1-10% ZnO, 0-5% MgO, 7-12.5% CaO, 0-5% SrO, 0-4% BaO, ≧0.1% Li2O+Na2O+K2O in which 0-1% Li2O, 0-1% Na2O and 0-1% K2O, 0-0.5% As2O3 and 0-0.5% Sb2O3 and have a specific gravity of 4.1 or below, and optical constants of a refractive index (nd) exceeding 1.88 and up to 1.93 and an Abbe number j(&ngr; d) within a range from 28 to 31. A preferable range of Nb2O5 is 15.5—less than 20.5% and a more preferable range of Nb2O5 is less 15.5-20%.
    • 眼科和眼镜具有重量百分比为4.5-9.5%SiO 2,10-19.5%B 2 O 3,0-3%Al 2 O 3,0-5%GeO 2,18-小于23%La 2 O 3,0.3%小于2%Gd 2 O 3 ,5.5-13.5%TiO2,0-7.5%ZrO2,15-21%Nb2O5,0-1.5%Ta2O5,0.3-5%WO3,条件是(Ta2O5 + WO3)/ B2O3的比例为0.5以下 的重量,2.1-10%ZnO,0-5%MgO,7-12.5%CaO,0-5%SrO,0-4%BaO,≥0.1%Li2O + Na2O + K2O,其中0-1%Li2O, 0-1%Na2O和0-1%K2O,0-0.5%As2O3和0-0.5%Sb2O3,比重4.1或更低,折射率(nd)的光学常数超过1.88和高达1.93, 阿贝数j(&ngr; d)在28〜31的范围内.Nb 2 O 5的优选范围为20.5%以下15.5以下,Nb 2 O 5的更优选范围为15.5〜20%。
    • 10. 发明授权
    • Ophthalmic glass of high refractive index
    • 高折射率眼镜玻璃
    • US5548353A
    • 1996-08-20
    • US326888
    • 1994-10-21
    • Reinhard Kassner
    • Reinhard Kassner
    • G02C7/06C03C3/07C03C3/074C03C4/06G02B1/00
    • C03C3/07Y10S501/901Y10S501/903
    • The invention relates to a glass of high refractive index suitable for the close-vision part of multifocal, in particular phototropic multifocal, spectacle lenses. The glass has a composition (in % by weight, based on oxide) of:SiO.sub.2 28-40; B.sub.2 O.sub.3 0-8.5; Li.sub.2 O 0-1; Na.sub.2 O 0-2.5; K.sub.2 O 0-5; CaO 0-6; SrO 0-6; BaO 6-12; ZnO 9-16; PbO 32-40; TiO.sub.2 0.3-7; ZrO.sub.2 0.3-5; .SIGMA. Li.sub.2 O+Na.sub.2 O+K.sub.2 O 0-5, anda refractive index n.sub.e of 1.66-1.81, an expansion coefficient .alpha..sub.20-300 of 5.7-6.8.times.10.sup.-6 K.sup.-1, a softening point of 650.degree.-700.degree. C. and a glass transition temperature Tg of 520.degree.-560.degree. C.
    • 本发明涉及适用于多焦点的近视部分,特别是光致变色多焦点眼镜镜片的高折射率玻璃。 该玻璃具有以下成分(以重量%计,基于氧化物):SiO 2 28-40; B2O3 0-8.5; Li2O 0-1; Na2O 0-2.5; K2O 0-5; CaO 0-6; SrO 0-6; 宝6-12; ZnO 9-16; PbO 32-40; TiO2 0.3-7; ZrO2 0.3-5; SIGMA Li2O + Na2O + K2O0-5,折射率ne为1.66-1.81,膨胀系数α20-300为5.7-6.8×10-6 K-1,软化点为650〜 玻璃化转变温度Tg为520〜-560℃