And Zirconium, Titanium, Tantalum, Or Niobium Patents (Class 501/51)
  • Patent number: 9650285
    Abstract: Provided is a glass which contains, by mass %, the following components: 20 to 35% of SiO2 and B2O3 in total, 50 to 70% of La2O3, Gd2O3, Y2O3 and Yb2O3 in total, 37 to 69% of La2O3, 0 to 3% of Gd2O3, 3 to 30% of Y2O3, 0% or more but less than 2% of Yb2O3, 2 to 15% of ZrO2, 1 to 6% of TiO2, Nb2O5 and Ta2O5 in total, 0 to 4% of ZnO, and 0 to 2% of WO3, wherein a mass ratio ZnO/Nb2O5 is in a range of 0 to 1.0 but Nb2O5 is contained as an essential component, a refractive index nd is in a range of 1.790 to 1.830, and an Abbe's number vd is in a range of 45 to 48.
    Type: Grant
    Filed: September 29, 2015
    Date of Patent: May 16, 2017
    Assignee: HOYA CORPORATION
    Inventor: Tomoaki Negishi
  • Patent number: 8956988
    Abstract: An optical Glass characterized by comprising, denoted as molar percentages: B2O5—5 to 45 percent; SiO2—0 to 6 percent (excluding 6 percent); Li2O, Na2O, K2O in total—0 to 3 percent; ZnO—10 to 40 percent; La2O3. 5 to 30 percent; Gd2O3—1 to 20 percent; and ZrO2, TaO2, TiO2, Nb2O5, WO3, and Bi2O3 in total—2.5 to 20 percent. The cation ratio of the Ti4+ content relative to the total content of Zr4+, Ta5+, Ti4+, Nb5+, W6+, and Bi3+ is 0.30 or lower; in that the temperature Tp at which a viscosity of 107.2 dPa·s is exhibited is 706° C. or lower. The refractive index nd and the Abbé number v(nu)d satisfy all of the following relations (I) to (IV): 34.0?vd<40 (I); nd?1.87 (II); nd?2.245?0.01×vd (III) and nd?2.28?0.01×vd (IV).
    Type: Grant
    Filed: November 21, 2012
    Date of Patent: February 17, 2015
    Assignee: Hoya Corporation
    Inventor: Yasuhiro Fujiwara
  • Patent number: 8951926
    Abstract: The invention provides an optical glass for press molding which can satisfy all of the following requirements: (1) it contains no environmentally undesirable components; (2) it can easily achieve a low glass transition point; (3) it has a high refractive index and high dispersion; (4) it can easily provide a glass having an excellent visible light transmittance; and (5) it has excellent resistance to devitrification during preparation of a preform. The optical glass for press molding has a refractive index nd of 1.925 or more, an Abbe's number ?d of 10 to 30, and a glass composition, in % by mass, of 20 to 80% Bi2O3, 10 to 30% B2O3, and 0 to 5.5% GeO2 and is substantially free of lead component, arsenic component, and F component.
    Type: Grant
    Filed: October 17, 2013
    Date of Patent: February 10, 2015
    Assignee: Nippon Electric Glass Co., Ltd.
    Inventors: Takahiro Matano, Fumio Sato, Yoko Usui
  • Patent number: 8921247
    Abstract: The present invention relates to an optical glass including, in terms of mass % on the basis of oxides, B2O3: 10% to 20%, SiO2: 0.5% to 12%, ZnO: 5% to 19%, Ta2O5: 3% to 17%, Li2O: 0.2% to 3%, ZrO2: 0.6% to 4.9%, WO3: 6.1% to 20%, La2O3: 32.5% to 50%, and Y2O3: 0.2% or more and less than 1.5%, in which a mass fraction (La2O3/Y2O3) of a content of La2O3 to a content of Y2O3 in terms of mass % is 40 or higher, and the optical glass has optical constants of a refractive index nd of 1.83 to 1.88 and an Abbe's number ?d of 39 to 42.
    Type: Grant
    Filed: July 22, 2013
    Date of Patent: December 30, 2014
    Assignee: Asahi Glass Company, Limited
    Inventor: Noriyoshi Kayaba
  • Patent number: 8883664
    Abstract: An aspect of the present invention relates to optical glass, which is oxide glass comprising various cationic components in prescribed amounts without Pb, with a refractive index nd of 1.750 to 1.850, an Abbé number ?d of 29.0 to 40.0, and a glass transition temperature of less than 630° C.
    Type: Grant
    Filed: April 18, 2012
    Date of Patent: November 11, 2014
    Assignee: Hoya Corporation
    Inventor: Tomoaki Negishi
  • Patent number: 8859444
    Abstract: A high-refractivity low-dispersion optical glass of which the Ta2O5 content is suppressed is provided, the optical glass comprising, by mass %, 1 to 30% of B2O3, 0.1 to 20% of SiO2, 55 to 75% of a total of La2O3, Gd2O3, Y2O3 and Yb2O3, the content of La2O3 being 15 to 55%, the mass ratio of the content of Gd2O3 to the total content of La2O3, Gd2O3, Y2O3 and Yb2O3, Gd2O3/La2O3+Gd2O3+Y2O3+Yb2O3), being 0.17 to 0.65, 0 to 13% of Ta2O5 (exclusive of 13%), and 0 to 25% of a total of Nb2O5, TiO2, WO3 and ZrO2, the content of Nb2O5 being less than 10%, and having a refractive index nd of 1.83 to 1.92 and an Abbe's number ?d of 36 to 45.
    Type: Grant
    Filed: September 29, 2010
    Date of Patent: October 14, 2014
    Assignee: Hoya Corporation
    Inventors: Kosuke Yamaguchi, Yoichi Hachitani
  • Patent number: 8835334
    Abstract: Provided is an optical glass which can satisfy all of the following requirements: (1) it contains no environmentally undesirable components; (2) it can easily achieve a low glass transition point; (3) it has a high refractive index and high dispersion; (4) it can easily provide a glass having a superior visible light transmittance; and (5) it has superior resistance to devitrification during preparation of a preform. The optical glass has a refractive index nd of 2.0 or more, an Abbe's number ?d of 20 or less, a glass transition point of 450° C. or below, and a glass composition, in % by mass, of 70 to 90% Bi2O2, 4 to 29.9% B2O2, 0.1 to 10% Li2O+Na2O+K2O, and 0 to 2.5% SiO2+Al2O2 and is substantially free of lead component, arsenic component, F component, TeO2, and GeO2.
    Type: Grant
    Filed: September 12, 2011
    Date of Patent: September 16, 2014
    Assignee: Nippon Electric Glass Co., Ltd.
    Inventors: Takahiro Matano, Fumio Sato
  • Publication number: 20140256531
    Abstract: An optical glass including B3+, La3+ and Nb5+ as cationic components constituting the glass, wherein the optical glass satisfies the following expressions represented in cation percentages: 10 cat. %?B3+?50 cat. %; 40 cat. %?La3+?65 cat. %; 0 cat. %?Nb5+?40 cat. %; 80 cat. %?(total amount of B3++La3++Nb5+)?100 cat. %; and 0 cat. %?Si4+?10 cat. %; 0 cat. %?Ge4+?5 cat. %; 0 cat. %?Mg2+?5 cat. %; 0 cat. %?Ba2+?10 cat. %; 0 cat. %?Ca2+?10 cat. %; 0 cat. %?Sr2+?10 cat. %; 0 cat. %?Zn2+?20 cat. %; 0 cat. %?W6+?5 cat. %; 0 cat. %?Zr4+?5 cat. %; 0 cat. %?Ti4+?5 cat. %; 0 cat. %?Bi3+?5 cat. %; 0 cat. %?Ta5+?10 cat. %; 0 cat. %?(total amount of Y3++Gd3+)?20 cat. %; and 0 cat. %?(total amount of Yb3++Lu3+)?10 cat. %.
    Type: Application
    Filed: February 26, 2014
    Publication date: September 11, 2014
    Applicants: CANON KABUSHIKI KAISHA, THE UNIVERSITY OF TOKYO
    Inventors: Michio Endo, Shingo Eguchi, Hiroyuki Inoue, Atsunobu Masuno
  • Patent number: 8748328
    Abstract: An optical glass having a refractive index nd of 1.70 or greater and an Abbé number of 50 or greater. Given as mole percentages, it comprises: B2O3 (20 to 80 percent), SiO2 (0 to 30 percent), Li2O (1 to 25 percent), ZnO (0 to 20 percent), La2O3 (4 to 30 percent), Gd2O3 (1 to 25 percent), Y2O3 (0 to 20 percent), ZrO2 (0 to 5 percent), MgO (0 to 25 percent), CaO (0 to 15 percent), and SrO (0 to 10 percent), with the combined quantity of the above components being 97 percent or greater. The molar ratio of {ZnO/(La2O3+Gd2O3+Y2O3)} is 0.8 or less and the molar ratio of {(CaO+SrO+BaO)/(La2O3+Gd2O3+Y2O3)} is 0.8 or less. Ta2O5 may be incorporated as an optional component, with the molar ratio {(ZrO2+Ta2O5)/(La2O3+Gd2O3+Y2O3)} being 0.4 or less.
    Type: Grant
    Filed: October 16, 2012
    Date of Patent: June 10, 2014
    Assignee: Hoya Corporation
    Inventor: Yasuhiro Fujiwara
  • Patent number: 8741795
    Abstract: An optical glass having high-refractivity and low-dispersion properties and containing, by mol %, 0.1 to 40% of SiO2, 10 to 50% of B2O3, wherein the mass ratio of the content of SiO2 to the content of B2O3, SiO2/B2O3, is 1 or less, 0.5 to 22% of ZnO, 5 to 50% of La2O3, and optionally other ingredients. The optical glass has a refractive index nd of 1.86 to 1.95 and an Abbe's number ?d of (2.36?nd)/0.014 or more but less than 38, and a glass transition temperature of equal to or greater than 640° C.
    Type: Grant
    Filed: March 18, 2013
    Date of Patent: June 3, 2014
    Assignee: Hoya Corporation
    Inventors: Xuelu Zou, Yunoshin Kanayama, Tomoaki Negishi
  • Patent number: 8741796
    Abstract: A high-refractivity low-dispersion optical glass that can be stably supplied and has excellent glass stability and that has coloring reduced, composed of in mass %, 5 to 32% of total of SiO2 and B2O2, 45 to 65% of total of La2O2, Gd2O2 and Y2O2, 0.5 to 10% of ZnO, 1 to 20% of total of TiO2 and Nb2O5, and optionally other components. The optical glass has a refractive index nd of 1.89 to 2.0, an Abbe's number ?d of 32 to 38 and a coloring degree ?70 of 430 nm or less.
    Type: Grant
    Filed: June 24, 2013
    Date of Patent: June 3, 2014
    Assignee: Hoya Corporation
    Inventors: Tomoaki Negishi, Xuelu Zou
  • Patent number: 8728963
    Abstract: An optical glass that is an oxide glass having a very high refractive index in spite of its low-dispersion property, having excellent glass stability and having less susceptibility to coloring.
    Type: Grant
    Filed: March 5, 2013
    Date of Patent: May 20, 2014
    Assignee: Hoya Corporation
    Inventors: Tomoaki Negishi, Xuelu Zou
  • Patent number: 8697589
    Abstract: The invention provides an optical glass for press molding which can satisfy all of the following requirements: (1) it contains no environmentally undesirable components; (2) it can easily achieve a low glass transition point; (3) it has a high refractive index and high dispersion; (4) it can easily provide a glass having an excellent visible light transmittance; and (5) it has excellent resistance to devitrification during preparation of a preform. The optical glass for press molding has a refractive index nd of 1.925 or more, an Abbe's number ?d of 10 to 30, and a glass composition, in % by mass, of 20 to 80% Bi2O3, 10 to 30% B2O3, and 0 to 5.5% GeO2 and is substantially free of lead component, arsenic component, and F component.
    Type: Grant
    Filed: June 14, 2010
    Date of Patent: April 15, 2014
    Assignee: Nippon Electric Glass Co., Ltd.
    Inventors: Takahiro Matano, Fumio Sato, Yoko Usui
  • Patent number: 8609560
    Abstract: The present invention relates to an optical glass having a refractive index nd of 1.86 or higher and an Abbé number v(nu)d of 28 to 36; a preform for precision press molding and an optical element that are comprised of this glass; and a method for manufacturing the optical element.
    Type: Grant
    Filed: February 25, 2011
    Date of Patent: December 17, 2013
    Assignee: Hoya Corporation
    Inventor: Tomoaki Negishi
  • Patent number: 8592332
    Abstract: The present invention relates to an optical glass with a refractive index nd of 1.89 or higher and an Abbé number v(nu)d of 28 to 36; a preform for precision press molding and an optical element that are comprised of this glass; and a method for manufacturing the optical element.
    Type: Grant
    Filed: February 25, 2011
    Date of Patent: November 26, 2013
    Assignee: Hoya Corporation
    Inventor: Tomoaki Negishi
  • Patent number: 8575049
    Abstract: An optical glass comprising, by mass %, 12 to 30% of total of B2O3 and SiO2, 55 to 80% of total of La2O3, Gd2O3, Y2O3, Yb2O3, ZrO2, Nb2O5 and WO3, 2 to 10% of ZrO2, 0 to 15% of Nb2O5, 0 to 15% of ZnO and 0% or more but less than 13% of Ta2O5, wherein the ratio of the content of Ta2O5 to the total content of La2O3, Gd2O3, Y2O3, Yb2O3, ZrO2, Nb2O5 and WO3 is 0.23 or less, the ratio of the total content of La2O3, Gd2O3, Y2O3 and Yb2O3 to the total content of B2O3 and SiO2 is from 2 to 4, the optical glass having a refractive index nd of 1.86 or more and an Abbe's number ?d of 38 or more, and a rod-shaped glass shaped material and an optical element formed of the above optical glass each.
    Type: Grant
    Filed: August 10, 2012
    Date of Patent: November 5, 2013
    Assignee: Hoya Corporation
    Inventors: Yuta Kobayashi, Yoichi Hachitani, Yunoshin Kanayama
  • Patent number: 8563451
    Abstract: The invention provides a novel optical glass which has a refractive index (nd) of 1.78 to 2.2 and an Abbe value (?d) of 16 to less than 40 and is suitable for precision mold press molding by virtue of its having a low glass transition temperature, namely, an optical glass which contains by mole in terms of oxides 25 to 60% B2O3, 2 to 45% (in total) TiO2 and Nb2O5 and 1 to 25% WO3 and has a refractive index (nd) of 1.78 to 2.2 and an Abbe value (?d) of 16 to less than 40. Further, the glass contains 5 to 35% La2O3 and 1 to 40% ZnO and has a glass transition temperature (Tg) of 700° C. or below. The optical glass is excellent in meltability, stability and devitrification resistance and has a high refractive index, high light-dispersive power and excellent precision press moldability.
    Type: Grant
    Filed: September 30, 2011
    Date of Patent: October 22, 2013
    Assignee: Ohara Inc.
    Inventor: Jie Fu
  • Patent number: 8507394
    Abstract: There is provided a glass composition having a devitrification temperature of 1000° C. or below, a glass transformation temperature (Tg) of 535° C. or below and a specific gravity within a range from 3 to 4. The glass composition has a refractive index (nd) within a range from 1.60 to 1.75 and an Abbe number (?d) within a range from 50 to 60.
    Type: Grant
    Filed: April 14, 2006
    Date of Patent: August 13, 2013
    Assignee: Ohara Inc.
    Inventor: Koji Shimizu
  • Patent number: 8492298
    Abstract: Provided is an optical glass having homogeneous optical characteristics such that striae and devitrification hardly occur at the time of producing a gob. The optical glass includes cationic components having the following composition, provided that a total of the cationic components is 95 cat %, and has a refractive index (nd) of 1.6 or more and less than 1.7 and an Abbe number (vd) of 50 or more and 56 or less, Si4+ 3 cat % or more and 13 cat % or less B3+ 40 cat % or more and 55 cat % or less La3+ 4 cat % or more and 9 cat % or less Ca2+ 6 cat % or more and 12 cat % or less Li+ 11 cat % or more and 18 cat % or less Zn2+ 6 cat % or more and 12 cat % or less Zr4+ 1 cat % or more and 4 cat % or less provided that Si4+/B3+ is 0.05 or more and 0.3 or less, and Li+/Zn2+ is 1.3 or more and 2.0 or less.
    Type: Grant
    Filed: September 24, 2009
    Date of Patent: July 23, 2013
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kiyoshi Yamamoto, Michio Endo
  • Patent number: 8492299
    Abstract: A high-refractivity low-dispersion optical glass that can be stably supplied and has excellent glass stability and that has coloring reduced, composed of in mass %, 5 to 32% of total of SiO2 and B2O3, 45 to 65% of total of La2O3, Gd2O3 and Y2O3, 0.5 to 10% of ZnO, 1 to 20% of total of TiO2 and Nb2O5, and optionally other components. The optical glass has a refractive index nd of 1.89 to 2.0, an Abbe's number ?d of 32 to 38 and a coloring degree ?70 of 430 nm or less.
    Type: Grant
    Filed: January 26, 2012
    Date of Patent: July 23, 2013
    Assignee: Hoya Corporation
    Inventors: Tomoaki Negishi, Xuelu Zou
  • Publication number: 20130178354
    Abstract: An optical glass that is an oxide glass having a very high refractive index in spite of its low-dispersion property, having excellent glass stability and having less susceptibility to coloring.
    Type: Application
    Filed: March 5, 2013
    Publication date: July 11, 2013
    Applicant: HOYA CORPORATION
    Inventor: HOYA CORPORATION
  • Patent number: 8476177
    Abstract: The optical glass has a refractive index nd of 1.945?nd?1.97, an Abbe number ?d of 33??d?36, and a composition with the following components in amounts expressed in % of their cations, with respect to the total number of cations in the composition: B3+, 35-46; La3+, 25-35; Ta5+, 6-14; W6+, 6-13; Zr4+, 1-7; Gd3+, 0-5; Nb5+, 0-4; Y+3, 0-4; Ba2+, 0-2; ? alkaline earth metal cations, 0-2, ? La3++Ta3++W6++Zr4++Gd3++Nb5++Y3+?50; and at least one fining agent, 0-0.3. Also a ratio of B3+ to La+3 is 1.1 to 1.6 and a ratio of B3+ to ? Si+4+B3+ is ?0.5. The glass is free of lead, arsenic, Ti4+, Th4+, Zn2+, F?, and Hf+4.
    Type: Grant
    Filed: December 2, 2010
    Date of Patent: July 2, 2013
    Assignee: Schott AG
    Inventors: Simone Ritter, Ute Woelfel, Stefanie Hansen
  • Patent number: 8424344
    Abstract: An optical glass comprising, by mol %, 0.1 to 40% of SiO2, 10 to 50% of B2O3, 0 to 10% of total of Li2O, Na2O and K2O, 0 to 10% of total of MgO, CaO, SrO and BaO, 0.5 to 22% of ZnO, 5 to 50% of La2O3, 0.1 to 25% of Gd2O3, 0.1 to 20% of Y2O3, 0 to 20% of Yb2O3, 0 to 25% of ZrO2, 0 to 25% of TiO2, 0 to 20% of Nb2O5, 0 to 10% of Ta2O5, over 0.1% but not more than 20% of WO3, 0 to less than 3% of GeO2, 0 to 10% of Bi2O3, and 0 to 10% of Al2O3, the mass ratio of the content of SiO2 to the content of B2O3, SiO2/B2O3, being 1 or less, the optical glass having a refractive index nd of 1.86 to 1.95 and an Abbe's number ?d of (2.36?nd)/0.014 or more but less than 38.
    Type: Grant
    Filed: January 22, 2009
    Date of Patent: April 23, 2013
    Assignee: Hoya Corporation
    Inventors: Xuelu Zou, Yunoshin Kanayama, Tomoaki Negishi
  • Publication number: 20130090225
    Abstract: Provided is an optical glass which can satisfy all of the following requirements: (1) it contains no environmentally undesirable components; (2) it can easily achieve a low glass transition point; (3) it has a high refractive index and high dispersion; (4) it can easily provide a glass having a superior visible light transmittance; and (5) it has superior resistance to devitrification during preparation of a preform. The optical glass has a refractive index nd of 2.0 or more, an Abbe's number vd of 20 or less, a glass transition point of 450° C. or below, and a glass composition, in % by mass, of 70 to 90% Bi2O2, 4 to 29.9% B2O2, 0.1 to 10% Li2O+Na2O+K2O, and 0 to 2.5% SiO2+Al2O2 and is substantially free of lead component, arsenic component, F component, TeO2, and GeO2.
    Type: Application
    Filed: September 12, 2011
    Publication date: April 11, 2013
    Inventors: Takahiro Matano, Fumio Sato
  • Patent number: 8410008
    Abstract: An optical glass that is an oxide glass having a very high refractive index in spite of its low-dispersion property, having excellent glass stability and having less susceptibility to coloring.
    Type: Grant
    Filed: December 29, 2011
    Date of Patent: April 2, 2013
    Assignee: Hoya Corporation
    Inventors: Tomoaki Negishi, Xuelu Zou
  • Publication number: 20130079213
    Abstract: An optical Glass characterized by comprising, denoted as molar percentages: B2O5—5 to 45 percent; SiO2—0 to 6 percent (excluding 6 percent); Li2O, Na2O, K2O in total—0 to 3 percent; ZnO—10 to 40 percent; La2O3. 5 to 30 percent; Gd2O3—1 to 20 percent; and ZrO2, TaO2, TiO2, Nb2O5, WO3, and Bi2O3 in total—2.5 to 20 percent. The cation ratio of the Ti4+ content relative to the total content of Zr4+, Ta5+, Ti4+, Nb5+, W6+, and Bi3+ is 0.30 or lower; in that the temperature Tp at which a viscosity of 107.2 dPa·s is exhibited is 706° C. or lower. The refractive index nd and the Abbé number v(nu)d satisfy all of the following relations (I) to (IV): 34.0?vd<40 (I); nd?1.87 (II); nd?2.245?0.01×vd (III) and nd?2.28?0.01×vd (IV).
    Type: Application
    Filed: November 21, 2012
    Publication date: March 28, 2013
    Applicant: HOYA CORPORATION
    Inventor: HOYA CORPORATION
  • Patent number: 8404606
    Abstract: The lead-free and arsenic-free optical glasses have a refractive index of 1.83?nd?1.95 and an Abbé number of 24??d?35, good chemical resistance, excellent crystallization stability and a composition, in wt. % based on oxide content, of SiO2, 2-8; B2O3, 15-22; La2O3, 35-42; ZnO, 10-18; TiO2, 9-15; ZrO2, 3-10; Nb2O5, 4-10; and WO3, >0.5-3. Besides containing at most 5 wt. % of each of GeO2, Ag2O and BaO and conventional fining agents, they may also contain at most in total 5 wt. % of Al2O3, MgO, CaO, SrO, P2O5 and up to at most in total 5 wt. % of the components F, Ta2O5. The glasses are preferably free of alkali metal oxides, Bi2O3, Y2O3, Gd2O3 and/or Yb2O3. Optical elements made from the optical glass are also described.
    Type: Grant
    Filed: February 24, 2010
    Date of Patent: March 26, 2013
    Assignee: Schott AG
    Inventors: Silke Wolff, Karl Mennemann, Uwe Kolberg, Ute Woelfel, Thomas Lifka
  • Patent number: 8399369
    Abstract: An object of the present invention is to provide optical glass having improved glass-devitrification resistance and moldability without causing reduction in refractive index, and also provide an optical element using the optical glass as a raw material. Specifically, the present invention provides an optical glass containing components of, by mol %: B2O3: over 60% through 75%; Bi2O3: 24% to 39%; La2O3: 7% or lower; Gd2O3: 7% or lower; and ZrO2: 7% or lower.
    Type: Grant
    Filed: December 22, 2010
    Date of Patent: March 19, 2013
    Assignee: Sumita Optical Glass, Inc.
    Inventor: Yoshinori Yamamoto
  • Patent number: 8377835
    Abstract: The present invention relates to an optical glass containing, in terms of mass % on the basis of oxides, B2O3: 10 to 20%, SiO2: 0.5 to 12%, ZnO: 5 to 19%, Ta2O5: 2.5 to 17%, Li2O: 0.2 to 3%, ZrO2: 0.6 to 4.9%, WO3: 1 to 20%, La2O3: 25 to 50%, Gd2O3: 0 to 13%, and Y2O3: 0.2 to 20%, provided that La2O3+Gd2O3+Y2O3 is 35 to 60%, in which the optical glass does not substantially contain Nb2O5, and has a refractive index (nd) of 1.82 to 1.86, an Abbe's number (?d) of 37 to 44 and a glass transition point (Tg) of 630° C. or lower.
    Type: Grant
    Filed: May 28, 2010
    Date of Patent: February 19, 2013
    Assignee: Asahi Glass Company, Limited
    Inventors: Satoru Tomeno, Yuki Kondo
  • Publication number: 20130040800
    Abstract: An optical glass having a refractive index nd of 1.70 or greater and an Abbé number of 50 or greater. Given as mole percentages, it comprises: B2O3 (20 to 80 percent), SiO2 (0 to 30 percent), Li2O (1 to 25 percent), ZnO (0 to 20 percent), La2O3 (4 to 30 percent), Gd2O3 (1 to 25 percent), Y2O3 (0 to 20 percent), ZrO2 (0 to 5 percent), MgO (0 to 25 percent), CaO (0 to 15 percent), and SrO (0 to 10 percent), with the combined quantity of the above components being 97 percent or greater. The molar ratio of {ZnO/(La2O3+Gd2O3+Y2O3)} is 0.8 or less and the molar ratio of {(CaO+SrO+BaO)/(La2O3+Gd2O3+Y2O3)} is 0.8 or less. Ta2O5 may be incorporated as an optional component, with the molar ratio {(ZrO2+Ta2O5)/(La2O3+Gd2O3+Y2O3)} being 0.4 or less.
    Type: Application
    Filed: October 16, 2012
    Publication date: February 14, 2013
    Applicant: HOYA CORPORATION
    Inventor: HOYA CORPORATION
  • Patent number: 8361916
    Abstract: An object of the invention is to provide an optical glass for precision press having optical properties of a high refractive index and a low dispersion property and having a low molding temperature, a high devitrification resistance, an excellent molding property, and a small specific gravity. The optical glass of the invention contains, in terms of % by mass on the basis of oxides, respective components of B2O3: 10 to 20%, SiO2: 0.5 to 12%, La2O3: 25 to 50%, Gd2O3: 0 to 20%, Y2O3: 0 to 20%, provided that La2O3+Gd2O3+Y2O3: 35 to 60%, ZnO: 5 to 20%, Li2O: 0.2 to 3%, ZrO2: 0 to 0.5%, Ta2O5: 3 to 18% and WO3: 3 to 20%, and has optical constants of a refractive index nd of 1.84 to 1.86 and an Abbe number vd of 37 to 42 and a glass transition point (Tg) of 630° C. or lower.
    Type: Grant
    Filed: June 2, 2010
    Date of Patent: January 29, 2013
    Assignee: Asahi Glass Company, Limited
    Inventors: Satoru Tomeno, Jun Sasai, Hiroyuki Ohkawa, Kenji Imakita, Yuki Kondo
  • Patent number: 8349749
    Abstract: An optical glass having a refractive index nd of 1.70 or greater and an Abbé number of 50 or greater. Given as mole percentages, it comprises: B2O3 (20 to 80 percent), SiO2 (0 to 30 percent), Li2O (1 to 25 percent), ZnO (0 to 20 percent), La2O3 (4 to 30 percent), Gd2O3 (1 to 25 percent), Y2O3 (0 to 20 percent), ZrO2 (0 to 5 percent), MgO (0 to 25 percent), CaO (0 to 15 percent), and SrO (0 to 10 percent), with the combined quantity of the above components being 97 percent or greater. The molar ratio of {ZnO/(La2O3+Gd2O3+Y2O3)} is 0.8 or less and the molar ratio of {(CaO+SrO+BaO)/(La2O3+Gd2O3+Y2O3)} is 0.8 or less. Ta2O5 may be incorporated as an optional component, with the molar ratio {(ZrO2+Ta2O5)/(La2O3+Gd2O3+Y2O3)} being 0.4 or less.
    Type: Grant
    Filed: September 13, 2011
    Date of Patent: January 8, 2013
    Assignee: Hoya Corporation
    Inventor: Yasuhiro Fujiwara
  • Patent number: 8338320
    Abstract: An optical Glass characterized by comprising, denoted as molar percentages: B2O5—5 to 45 percent; SiO2—0 to 6 percent (excluding 6 percent); Li2O, Na2O, K2O in total—0 to 3 percent; ZnO—10 to 40 percent; La2O3—5 to 30 percent; Gd2O3—1 to 20 percent; and ZrO2, TaO2, TiO2, Nb2O5, WO3, and Bi2O3 in total—2.5 to 20 percent. The cation ratio of the Ti4+ content relative to the total content of Zr4+, Ta5+, Ti4+, Nb5+, W6+, and Bi3+ is 0.30 or lower; in that the temperature Tp at which a viscosity of 107.2 dPa·s is exhibited is 706° C. or lower. The refractive index nd and the Abbé number v(nu)d satisfy all of the following relations (I) to (IV): 34.0?vd<40 (I); nd?1.87 (II); nd?2.245?0.01×vd (III) and nd?2.28?0.01×vd (IV).
    Type: Grant
    Filed: May 28, 2009
    Date of Patent: December 25, 2012
    Assignee: Hoya Corporation
    Inventor: Yasuhiro Fujiwara
  • Publication number: 20120302424
    Abstract: An optical glass comprising, by mass %, 12 to 30% of total of B2O3 and SiO2, 55 to 80% of total of La2O3, Gd2O3, Y2O3, Yb2O3, ZrO2, Nb2O5 and WO3, 2 to 10% of ZrO2, 0 to 15% of Nb2O5, 0 to 15% of ZnO and 0% or more but less than 13% of Ta2O5, wherein the ratio of the content of Ta2O5 to the total content of La2O3, Gd2O3, Y2O3, Yb2O3, ZrO2, Nb2O5 and WO3 is 0.23 or less, the ratio of the total content of La2O3, Gd2O3, Y2O3 and Yb2O3 to the total content of B2O3 and SiO2 is from 2 to 4, the optical glass having a refractive index nd of 1.86 or more and an Abbe's number ?d of 38 or more, and a rod-shaped glass shaped material and an optical element formed of the above optical glass each.
    Type: Application
    Filed: August 10, 2012
    Publication date: November 29, 2012
    Applicant: HOYA CORPORATION
    Inventors: Yuta KOBAYASHI, Yoichi Hachitani, Yunoshin Kanayama
  • Patent number: 8314042
    Abstract: An optical glass having a refractive index nd of 1.70 or greater and an Abbé number of 50 or greater. Given as mole percentages, it comprises: B2O3 (20 to 80 percent), SiO2 (0 to 30 percent), Li2O (1 to 25 percent), ZnO (0 to 20 percent), La2O3 (4 to 30 percent), Gd2O3 (1 to 25 percent), Y2O3 (0 to 20 percent), ZrO2 (0 to 5 percent), MgO (0 to 25 percent), CaO (0 to 15 percent), and SrO (0 to 10 percent), with the combined quantity of the above components being 97 percent or greater. The molar ratio of {ZnO/(La2O3+Gd2O3+Y2O3)} is 0.8 or less and the molar ratio of {(CaO+SrO+BaO)/(La2O3+Gd2O3+Y2O3)} is 0.8 or less. Ta2O5 may be incorporated as an optional component, with the molar ratio {(ZrO2+Ta2O5)/(La2O3+Gd2O3+Y2O3)} being 0.4 or less.
    Type: Grant
    Filed: September 13, 2011
    Date of Patent: November 20, 2012
    Assignee: Hoya Corporation
    Inventor: Yasuhiro Fujiwara
  • Publication number: 20120270719
    Abstract: An aspect of the present invention relates to optical glass, which is oxide glass comprising various cationic components in prescribed amounts without Pb, with a refractive index nd of 1.750 to 1.850, an Abbé number ?d of 29.0 to 40.0, and a glass transition temperature of less than 630° C.
    Type: Application
    Filed: April 18, 2012
    Publication date: October 25, 2012
    Applicant: HOYA CORPORATION
    Inventor: Tomoaki NEGISHI
  • Patent number: 8268739
    Abstract: Zirconium-containing BaO- and PbO-free X-ray opaque glasses having a refractive index nd of about 1.57 to about 1.61 and a high X-ray opacity with an aluminum equivalent thickness of at least about 400% are provided. Such glasses are based on a SiO2—Al2O3—La2O3—ZrO2—Cs2O system with additions of Li2O, Na2O, ZnO and/or Ta2O5. Such glasses may be used, in particular, as dental glasses or as optical glasses.
    Type: Grant
    Filed: January 28, 2010
    Date of Patent: September 18, 2012
    Assignee: Schott AG
    Inventors: Simone Monika Ritter, Oliver Hochrein, Sabine Pichler-Wilhelm
  • Patent number: 8263510
    Abstract: An optical class comprising, by mass %, 12 to 30% of total of B2O3 and SiO2, 55 to 80% of total of La2O3, Gd2O3, Y2O3, ZrO2, Nb2O5 and WO3, 2 to 10% of ZrO2, 0 to 15% of Nb2O5, 0 to 15% of ZnO and 0% or more but less than 13% of Ta2O5, wherein the ratio of the content of Ta2O5 to the total content of La2O3, Gd2O3, Y2O3, Yb2O3, ZrO2, Nb2O5 and WO3 is 0.23 or less, the ratio of the total content of La2O3, Gd2O3, Y2O3 and Yb2O3 to the total content of B2O3 and SiO2 is from 2 to 4, the optical glass having a refractive index nd of 1.86 or more and an Abbe's number ?d of 38 or more, and a rod shaped glass shaped material and an optical element formed of the above optical glass each.
    Type: Grant
    Filed: June 19, 2007
    Date of Patent: September 11, 2012
    Assignee: Hoya Corporation
    Inventors: Yuta Kobayashi, Yoichi Hachitani, Yunoshin Kanayama
  • Patent number: 8247336
    Abstract: An optical glass composition contains, in % by mole, 0% or more and 25.0% or less of SiO2, 20.0% or more and 40.0% or less of B2O3, 0% or more and 5.0% or less of Li2O, 3.0% or more and 15.0% or less of ZnO, 0% or more and 10.0% or less of ZrO2, 2.0% or more and 7.0% or less of Ta2O5, 6.0% or more and 25.0% or less of La2O3, 5.0% or more and 22.0% or less of Gd2O3, 66.5% or less of La2O3+Gd2O3+B2O3 and 26.0% or more of La2O3+Gd2O3, and has nd of 1.83 or higher and 1.86 or lower, vd of 43 or higher and 46 or lower and a liquidus temperature of 1300° C. or lower, and a preform and an optical element are formed from the optical glass composition.
    Type: Grant
    Filed: October 30, 2009
    Date of Patent: August 21, 2012
    Assignee: Panasonic Corporation
    Inventor: Minoru Onoda
  • Patent number: 8207076
    Abstract: A high-refractive index, low-dispersion optical glass which is small in a change of imaging properties due to a change in temperature of the use environment, specifically one capable of realizing an absolute value of multiplication (?×?) of an average coefficient of linear expansion (?) at from ?30 to +70° C. and a photoelastic constant (?) at a wavelength of 546.1 nm of not more than 130×10?12° C.?1×nm×cm?1×Pa?1, is manufactured without using large qualities of components which are high in an environmental load and scarce mineral resources. The optical glass of the invention has an absolute value of multiplication (?×?) of an average coefficient of linear expansion (?) at from ?30 to +70° C. and a photoelastic constant (?) at a wavelength of 546.1 nm of not more than 130×10?12° C.?1×nm×cm?1×Pa?1; and contains more than 0% of SiO2, B2O3 and La2O3, more than 13% and less than 20% of (ZrO2+Nb2O5) and less than 2.0% of ZnO in terms of % by mass on the oxide basis.
    Type: Grant
    Filed: September 25, 2008
    Date of Patent: June 26, 2012
    Assignee: Ohara Inc.
    Inventor: Mitchiko Ogino
  • Patent number: 8207075
    Abstract: Provided is an optical glass having optical constants, a refractive index (nd) of more than 1.9 and an Abbe number (?d) of not more than 38, having a small partial dispersion ratio and capable of being produced from inexpensive materials. The optical glass has a partial dispersion ratio (?g, F) of at most 0.615, and contains, as indispensable ingredients, B2O3, La2O3, TiO2, Nb2O5 and Ta2O5, wherein the ratio, as % by mass, of TiO2/Nb2O5 is at most 0.26 and GeO2/Nb2O5 is at most 0.38. The optical glass contains, in terms of % by mass, the following ingredients: B2O3 ??5 to 22%, La2O3 ??15 to 50%, TiO2 0.01 to 15%, Nb2O5 ??5 to 40%, and Ta2O5 ?0.1 to 25%, and SiO2 0 to 10% and/or GeO2 0 to 10% and/or Al2O3 0 to 10% and/or Gd2O3 0 to 16% and/or ZrO2 0 to 15% and/or WO3 0 to 22% and/or Sb2O3 0 to 1%.
    Type: Grant
    Filed: January 29, 2009
    Date of Patent: June 26, 2012
    Assignee: Ohara Inc.
    Inventors: Susumu Uehara, Kiyoyuki Momono
  • Patent number: 8187986
    Abstract: The invention provides a novel optical glass which has a refractive index (nd) of 1.78 to 2.2 and an Abbe value (?d) of 16 to less than 40 and is suitable for precision mold press molding by virtue of its having a low glass transition temperature, namely, an optical glass which contains by mole in terms of oxides 25 to 60% B2O3, 2 to 45% (in total) TiO2 and Nb2O5 and 1 to 25% WO3 and has a refractive index (nd) of 1.78 to 2.2 and an Abbe value (?d) of 16 to less than 40. Further, the glass contains 5 to 35% La2O3 and 1 to 40% ZnO and has a glass transition temperature (Tg) of 700° C. or below. The optical glass is excellent in meltability, stability and devitrification resistance and has a high refractive index, high light-dispersive power and excellent precision press moldability.
    Type: Grant
    Filed: October 3, 2007
    Date of Patent: May 29, 2012
    Assignee: Ohara Inc.
    Inventor: Jie Fu
  • Publication number: 20120100981
    Abstract: An optical glass that is an oxide glass having a very high refractive index in spite of its low-dispersion property, having excellent glass stability and having less susceptibility to coloring.
    Type: Application
    Filed: December 29, 2011
    Publication date: April 26, 2012
    Applicant: HOYA CORPORATION
    Inventors: Tomoaki NEGISHI, Xuelu Zou
  • Patent number: 8163665
    Abstract: An optical glass having refractive index (nd) exceeding 1.85, Abbe number (?d) of 36 or over, comprising SiO2, B2O3, La2O3, Gd2O3, Ta2O5 and Li2O as essential components, being free of Pb and As components, and having glass transition temperature (Tg) of 630° C. or below.
    Type: Grant
    Filed: May 31, 2005
    Date of Patent: April 24, 2012
    Assignee: Ohara, Inc.
    Inventors: Susumu Uehara, Koji Shimizu
  • Patent number: 8148280
    Abstract: An optical glass of the present invention has optical constants of a refractive index (nd) within a range from 1.75 to 1.85 and an Abbe number (?d) within a range from 35 to 45, comprises SiO2 and B2O3 as essential components and one or more components selected from the group consisting of ZrO2, Nb2O5, Ta2O5 and WO3, has a glass transition temperature (Tg) of 580° C. or below and has weathering resistance (surface method) of Class 1 or Class 2.
    Type: Grant
    Filed: February 21, 2006
    Date of Patent: April 3, 2012
    Assignee: Kabushiki Kaisha Ohara
    Inventor: Susumu Uehara
  • Publication number: 20120065051
    Abstract: The invention provides an optical glass for press molding which can satisfy all of the following requirements: (1) it contains no environmentally undesirable components; (2) it can easily achieve a low glass transition point; (3) it has a high refractive index and high dispersion; (4) it can easily provide a glass having an excellent visible light transmittance; and (5) it has excellent resistance to devitrification during preparation of a preform. The optical glass for press molding has a refractive index nd of 1.925 or more, an Abbe's number ?d of 10 to 30, and a glass composition, in % by mass, of 20 to 80% Bi2O3, 10 to 30% B2O3, and 0 to 5.5% GeO2 and is substantially free of lead component, arsenic component, and F component.
    Type: Application
    Filed: June 14, 2010
    Publication date: March 15, 2012
    Applicant: NIPPON ELECTRIC GLASS CO., LTD.
    Inventors: Takahiro Matano, Fumio Sato, Yoko Usui
  • Patent number: 8127570
    Abstract: A high-refractivity low-dispersion optical glass that can be stably supplied and has excellent glass stability and that has coloring reduced, comprises, by mass %, 5 to 32% of total of SiO2 and B2O3, 45 to 65% of total of La2O3, Gd2O3 and Y2O3, 0.5 to 10% of ZnO, 1 to 20% of total of TiO2 and Nb2O5, 0 to 15% of ZrO2, 0 to 2% of WO3, 0 to 20% of Yb2O3, 0 to 10% of total of Li2O, Na2O and K2O, 0 to 10% of total of MgO, CaO, SrO and BaO, 0 to 12% of Ta2O5, 0 to 5% of GeO2, 0 to 10% of Bi2O3, and 0 to 10% of Al2O3, wherein the mass ratio of the content of SiO2 to the content of B2O3, (SiO2/B2O3), is from 0.3 to 1.0, and the mass ratio of the total content of Gd2O3 and Y2O3 to the total content of La2O3, Gd2O3 and Y2O3, (Gd2O3+Y2O3)/(La2O3+Gd2O3+Y2O3), is from 0.05 to 0.6, the optical glass having a refractive index nd of 1.89 to 2.0 and an Abbe's number ?d of 32 to 38 and having a coloring degree ?70 of 430 nm or less.
    Type: Grant
    Filed: September 30, 2009
    Date of Patent: March 6, 2012
    Assignee: Hoya Corporation
    Inventors: Tomoaki Negishi, Xuelu Zou
  • Patent number: 8114796
    Abstract: The lead-free and fluorine-free optical glass has a refractive index of 1.60?nd?1.64 and an Abbe number of from 56?vd?64, a transformation temperature less than or equal to 590° C., can be precise pressed and is stable to cystallization. The glass has the following, composition (in weight-% based on oxide content. P2O5, 26-35; B2O3, 10-15; Al2O3, 5.5-10; BaO, 25-37; SrO, 0-6; CaO, 8-15; ZnO, 3-10; Bi2O3, 0-8; Na2O, 0-2; K2O, 0-2; WO3, 0-10; La2O3, 0-2; Nb2O5, 0-1; TiO2,0-<1; ? alkaline earth metal oxides ?40; ? alkali metal oxides, 0-2 and at least one fining agent, 0-0.5.
    Type: Grant
    Filed: October 2, 2007
    Date of Patent: February 14, 2012
    Assignee: Schott AG
    Inventors: Simone Monika Ritter, Ute Woelfel
  • Patent number: 8110513
    Abstract: A glass composition comprising: (A) TeO2 (50-95 mol %); (B) B2O3 (1-33 mol %); (C) ZnO (1-37 mol %); (D) Bi2O3 (1-18 mol %); (E) P2O5 (0-15 mol %); (F) R2O (0-13 mol %), where R represents at least one element selected from the group consisting of Li, Na, and K; (G) MO (0-13 mol %), where M represents at least one element selected from the group consisting of Mg, Ca, Sr, and Ba; (H) TiO2 (0-13 mol %); (I) Nb2O5 (0-10 mol %); (J) Ta2O5 (0-13 mol %); (K) L2O3 (0-11 mol %), where L represents at least one element selected from the group consisting of yttrium and lanthanoids; and (L) the total amount of P2O5, R2O, MO, TiO2, Nb2O5, Ta2O5, and L2O3 described in (E) to (K), respectively, is 0-15 mol %.
    Type: Grant
    Filed: June 24, 2008
    Date of Patent: February 7, 2012
    Assignee: Nikon Corporation
    Inventors: Motoi Ueda, Takashi Ozawa, Kiyoaki Shinohara
  • Patent number: 8110514
    Abstract: An optical glass that is an oxide glass having a very high refractive index in spite of its low-dispersion property, having excellent glass stability and having less susceptibility to coloring.
    Type: Grant
    Filed: June 25, 2009
    Date of Patent: February 7, 2012
    Assignee: Hoya Corporation
    Inventors: Tomoaki Negishi, Xuelu Zou