Abstract: Disclosed are optical glass, a glass preform or an optical element made therefrom and an optical instrument. The optical glass is calculated by a mass percentage content relative to a total mass of glass converted by an oxide, and the optical glass includes: B2O3: 5˜25%, La2O3: 25?45%, Gd2O3: 15?35%, Y2O3: 0?10%, Yb2O3: 0˜10%, Nb2O5: 2?15%, SiO2: 0.5˜15%, ZrO2: 1?15%, TiO2: 0.5˜10% and WO3: 0˜10%, a weight ratio of Nb2O5 to TiO2, i.e., Nb2O5/TiO2, is 2.17?8.5, and Ta2O5 is not contained.

Abstract: A composition for a glass material comprising, on an oxide basis: one or more network formers chosen from the group of silicon dioxide (SiO2) and phosphorous pentoxide (P2O5); one or more alkali metal oxides chose from the group consisting of lithium oxide (Li2O) and sodium oxide (Na2O); 8 to 15 percent by weight zirconium oxide (ZrO2); and one transition metal oxide consisting of 9 to 45 percent by weight niobium pentoxide (Nb2O5). In an embodiment, the composition consists of: 35 to 60 percent by weight silicon dioxide (SiO2); 9.25 to 15.0 percent by weight lithium oxide (Li2O); 0.5 to 2 percent by weight sodium oxide (Na2O); 8 to 15 percent by weight zirconium oxide (ZrO2); 0 to 3.5 percent by weight phosphorous pentoxide (P2O5); and 9 to 45 percent by weight niobium pentoxide (Nb2O5). In an embodiment, the glass material is a light guide for an augmented reality device.

Abstract: Al2O3— rich compositions with desirable hardness and crack resistance for various functional applications. Also disclosed is a method of manufacturing the composition into various dimensions and shapes under a temperature much lower than in conventional methods.

Abstract: An optical glass includes, in terms of mol % of cations, a total amount of La3+, Y3+, and Gd3+ components falling within a range of from 5% to 65% and a total amount of Zr4+, Hf4+, and Ta5+ components failing within a range of from 5% to 65%, and a relationship expressed in Expression (1) given below is satisfied. (La3++Y3++Gd3+)×(Zr4+ Hf4++Ta3+)?400(%)2.

Abstract: A glass substrate includes at least one selected from the group consisting of Li, Na, K, Mg, Ca, Sr, Ba and Zn as a reaction factor component, and includes a surface depletion layer at a surface side of the glass substrate. A total molar concentration (mol/cm3) of the reaction factor component in the surface depletion layer is decreased relative to an inside of the glass substrate. A total depletion amount (mol/cm2) of the reaction factor component in the surface depletion layer is 1.00×10?8 or more. The glass substrate has a refractive index (nd) of 1.68 or more.

Abstract: The present disclosure relates to a substrate for a display panel, a display panel and a display device. The substrate according to the present disclosure comprises a base doped with upconverting ions capable of converting an infrared light beam into a visible light beam, the base is made of microcrystalline glass, and the microcrystalline glass comprises at least one of matrix materials NaYF4 and NaGdF4. The substrate according to the present disclosure may be used for any of a color filter substrate, an array substrate and a coverplate of the display panel.

Abstract: The invention provides a high-refraction low-dispersion optical glass with refractive index of 1.76-1.80 and Abbe number of 47-51. The optical glass, comprising the following components by weight percentage: 0-3% of SiO2; 25-40% of B2O3; 20-40% of La2O3; 12-25% of Gd2O3; 6.5-15% of ZrO2; greater than 10% but less than or equal to 20% of ZnO; 0-5% of Ta2O5; 0-5% of Nb2O5; 0-10% of Li2O; less than 0.45 of (Ta2O5+Nb2O5)/(ZnO+Li2O); 0-10% of Y2O3; and below 625° C. of glass transition temperature Tg. With reasonable component ratio, the high-refraction low-dispersion optical glass favorable to precision molding with excellent transmittance can be easily enabled while realizing the required optical constant of the glass of the present invention.

Abstract: The invention provides a high-refraction low-dispersion optical glass with refractive index of 1.76-1.80 and Abbe number of 47-51. The glass has an excellent transmittance when the content of Ta2O5 in glass component is reduced. The optical glass comprises the following components by molar percentage: 40-65% of B2O3; 6-21% of La2O3; 1-15% of Gd2O3; greater than 6.5% but less than or equal to 15% of ZrO2; ad 10-28% of ZnO. According to the present invention, the transmittance of glass becomes excellent without introducing SnO2; the product cost is optimized by reducing the content of Ta2O5; with reasonable component ratio, the high-refraction low-dispersion optical glass in favor of precision molding and with excellent transmittance, as well as the glass preform and optical element made of the optical glass can be easily enabled while the required optical constant of the glass is realized.

Abstract: The invention provides a high-refraction low-dispersion optical glass with low material cost, refractive index of 1.77-1.85, and Abbe number of 40-48, wherein the following components by weight percentage: 4-20% of SiO2, 8-24% of B2O3, 20-40% of La2O3, 11-30% of Gd2O3, 0-15% of Y2O3, 0-8% of TiO2, 0-8% of Ta2O5, more than 0 but less than or equal to 8% of Nb2O5, less than 1 of Ta2O5/Nb2O5, more than 0 but less than or equal to 15% of ZrO2, and 11-30% of ZnO. The invention reduces the content of Ta2O5 and optimizes the cost of raw materials; through rational composition design, the optical glass of the invention is conducive to precision molding while achieving the required optical constant, with excellent chemical stability. A glass preform and an optical element made of the optical glass are also disclosed.

Abstract: An optical glass with high refractive index and low dispersion, having refractive index nd of 1.78-1.95, Abbe number ?d of 32-50, and contains no GeO2, so it is not easily devitrified. An optical glass, represented by cation %, including: 1-20% of Si4+; 25-60% of B3+; 10-40% of La3+; 0-15% of Y3+; 0-20% of Nb5+; 0-15% of Ti4+; 0-10% of Ta5+; 0-5% of W6+; 0-15% of Zr4+; 0-10% of Zn2+; 0-10% of Bi3+. An optical glass with excellent transmittance, an optical glass preform and an optical element formed by the above optical glass. The optical element made by the above optical glass and the above glass preform or optical element blank, such as lens, can be used for optical systems.

Abstract: A high refractivity and high dispersion optical glass with light transmissivity and good devitrification resistance. The high refractivity and high dispersion optical glass, including: 1 wt % to 13 wt % of SiO2, 6 wt % to 15 wt % of B2O3, 5 wt % to 22 wt % of TiO2, 35 wt % to 60 wt % of La2O3, 1 wt % to 15 wt % of Gd2O3, 2 wt % to 10 wt % of ZrO2, 1 wt % to 15 wt % of Nb2O5, 0.5 wt % to 8 wt % of ZnO, 0 to 8 wt % of WO3 and 0 to 10 wt % of Y2O3, with Ta2O5 and GeO2 excluded. The optical glass has degree of pigmentation and light transmissivity due to no pigmenting Bi2O3, and has low cost due to no valuable oxides such as Ta2O5 and GeO2. The optical glass has devitrification resistance with a refractive index of 1.95-2.07 and Abbe number of 25-35.

Abstract: To provide an optical system that lengthens the lifetime of a fiber, an optical system 13 guides light beams emitted from a plurality of light emitting parts ep into a single optical fiber 12, the plurality of light emitting parts ep are arranged to be aligned along a first direction d1, and the optical system 13 allows the light beams emitted from the plurality of light emitting parts ep to have different light collection centers which are offset from each other at least in a second direction d2.

Abstract: The optical glass is described that may be an oxide glass including, denoted as cation %, a total of 5 to 60% of B3+ and Si4+ (with 5 to 50% of B3+), a total of equal to or higher than 5% of Zn2+ and Mg2+, a total of 10 to 50% of La3+, Gd3+, Y3+, and Yb3+, and a total of 6 to 45% of Ti4+, Nb5+, Ta5+, W6+, and Bi3+ (a total content of Ti4+ and Ta5+ being higher than 0% and a content of W6+ being higher than 5%).

Abstract: Provided is a high refractive index glass, comprising, as a glass composition in terms of mass %, 0.1 to 60% of SiO2+Al2O3+B2O3, having a mass ratio (BaO+La2O3+Nb2O5+TiO2+ZrO2)/(SiO2+Al2O3+B2O3) of 0.1 to 50, amass ratio (MgO+CaO+SrO+BaO)/(BaO+La2O3+Nb2O5+TiO2+ZrO2) of 0 to 10, and a mass ratio (TiO2+ZrO2)/(BaO+La2O3+Nb2O5) of 0.001 to 40, and having a refractive index nd of 1.55 to 2.3.

Abstract: The invention provides an optical glass, which includes 6 wt % to 10 wt % of B2O3; 10 wt % to 15% of B2O3 and SiO2, wherein the content of B2O3 is more than that of SiO2; 27 wt % to 32 wt % of La2O3; 0 wt % to 5 wt % of Gd2O3, Y2O3 and Yb2O3, wherein the content of Gd2O3 is 0 wt % to 3 wt %; more than 19 wt % but less than 25 wt % of TiO2; more than 8 wt % but less than 15 wt % of Nb2O5; 0.5 wt % to 5 wt % of ZnO; 0 wt % to 2 wt % of WO3; 2 wt % to 10 wt % of ZrO2; more than 10 wt % but less than 15 wt % of BaO; 0 wt % to 5 wt % of CaO, SrO and MgO, wherein the content of SrO is 0 wt % to 3 wt %; and 0 wt % to 0.1 wt % of Sb2O3.

Abstract: A lead-free conductive paste composition contains a source of an electrically conductive metal, a fusible material, an optional additive, and an organic vehicle. An article such as a high-efficiency photovoltaic cell is formed by a process of deposition of the lead-free paste composition on a semiconductor substrate (e.g., by screen printing) and firing the paste to remove the organic vehicle and sinter the metal and fusible material.

Abstract: The optical glass is described that may be an oxide glass including, denoted as cation %, a total of 5 to 60% of B3+ and Si4+ (with 5 to 50% of B3+), a total of equal to or higher than 5% of Zn2+ and Mg2+, a total of 10 to 50% of La3+, Gd3+, Y3+, and Yb3+, and a total of 6 to 45% of Ti4+, Nb5+, Ta5+, W6+, and Bi3+ (a total content of Ti4+ and Ta5+ being higher than 0% and a content of W6+ being higher than 5%).

Abstract: A highly refractive and highly transparent optical glass is provided. The use of such a glass, optical elements and processes for producing the glass or the optical elements are also provided.

Abstract: The invention relates to glasses for use in solid laser applications, particularly short-pulsed, high peak power laser applications. In particular, the invention relates to a method for broadening the emission bandwidth of rare earth ions used as lasing ions in solid laser glass mediums, especially phosphate-based glass compositions, using Nd and Yb as co-dopants. The invention further relates to a laser system using a Nd-doped and Yb-doped phosphate laser glass, and a method of generating a laser beam pulse using such a laser system.

Abstract: An optical glass is provided. The optical glass is suitable for use in optical elements including lenses, prisms, light guide rods, arrays, optical fibres, gradient components and optical windows in the fields of imaging, sensor technology, microscopy, medical technology, digital projection, telecommunication, optical messaging technology/information transmission, optics/illumination in the automotive sector, for solar technology, photolithography, steppers, excimer lasers, wafers, computer chips and/or integrated circuits and electronic instruments which contain such circuits and chips. The optical glass contains the components La2O3, B2O3, GeO2, HfO2 and In2O3 and in which the following components are present in the following proportions, in % by weight on an oxide basis: SiO2O2 1-8; Sb2O3 0-<2; SiO2+B2O3 1-<20; and SiO2+B2O3+GeO2+HfO2+In2O3 15-25.

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).

Abstract: An aspect of the present invention relates to optical glass, which is oxide glass, having a refractive index nd ranging from 1.95 to 2.50 and an Abbé number ?d ranging from 18 to 40, including essential components in the form of Si4+, B3+, La3+, Ti4+, Nb5+, and at least one from among Gd3+, Y3+, and Yb3+, including, denoted as cation %, 1 to 30% of Si4+, 1 to 50% of B3+, wherein a total of Si4+ and B3+ ranges from 5 to 55%, a total of 11 to 70% of La3+, Gd3+, Y3+, and Yb3+, with 10 to 50% of La3+, a total of 23 to 70% of Ti4+, Nb5+, Ta5+, and W6+, with equal to or greater than 1% of Nb5+ and greater than 22% of Ti4+.

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.

Abstract: An optical glass is oxide glass wherein Si4++B3+ ranges from 10-60 cation %, La3++Gd3++Y3++Yb3+ ranges from 25-70 cation %, Ti4++Nb5++W6++Bi3+ ranges from 10-20 cation %, Li+ content ranges from 0-5.0 cation %, Ge content is lower than 5.0 mass % as quantity of GeO2 based on oxides, no Pb included, a cation ratio, Si4+/B3+, is equal or lower than 0.70, a cation ratio, (La3++Gd3++Y3++Yb3+)/(Ti4++Nb5++W6++Bi3+), ranges from 1.90-7.00, a cation ratio, Y3+/(La3++Gd3++Y3++Yb3+), is equal or lower than 0.180, and Nb5+ is an essential component, with Ti4+/Nb5+ being equal or lower than 4.00, with nd of higher than 1.920 and equal or lower than 2.000, vd ranging from 28.0-34.0, and yield point higher than 645° C., and a deviation ?Pg,F from normal line of partial dispersion ratio Pg,F being equal or lower than 0.0005.

Abstract: The invention includes a composition for sealing agent, generally in the form of glass frit, lead-free, comprising by weight over the total weight of the composition: 30-80% Bi2O3; 2-10% ZnO; 2-10% B2O3; 0-5% Na2O; 1-10% SiO2; 1-8% Al2O3; 0-7% BaO; and 0-8% MgO. The composition for sealing agent as defined above can be added with a filler in a quantity up to 20% by weight over the total weight of the resulting mixture. The invention also includes a sealing paste containing the composition for sealing agent, the optional filler, an organic binder and optionally an organic solvent. The invention also includes methods for producing and using the composition for sealing agent and the sealing paste, as well as an electronic device sealed with the sealing paste.

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.

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.

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.

Abstract: An aspect of the present invention relates to an optical glass, which comprises, denoted as weight percent, 2 to 37 percent of SiO2, 0 to 25 percent of B2O3, 0 to 10 percent of GeO2, 18 to 55 percent of a combined content of Li2O, Na2O, K2O, CaO, SrO, and BaO, and 27 to 55 percent of a combined content of TiO2, Nb2O5, and WO3, wherein the weight ratio of SiO2 content relative to a combined content of SiO2 and B2O3 ranges from 0.1 to 1, a weight ratio of the Li2O content to a combined content of Li2O, Na2O, K2O, CaO, SrO, and BaO ranges from 0 to 0.4, and a weight ratio of TiO2 content relative to a combined content of TiO2, Nb2O5, and WO3 ranges from 0.35 to 1, with a refractive index nd of 1.860 to 1.990 and an Abbé number ?d of 21 to 29.

Abstract: The invention provides an optical glass, which includes 6 wt % to 10 wt % of B2O3; 10 wt % to 15% of B2O3 and SiO2, wherein the content of B2O3 is more than that of SiO2; 27 wt % to 32 wt % of La2O3; 0 wt % to 5 wt % of Gd2O3, Y2O3 and Yb2O3, wherein the content of Gd2O3 is 0 wt % to 3 wt %; more than 19 wt % but less than 25 wt % of TiO2; more than 8 wt % but less than 15 wt % of Nb2O5; 0.5 wt % to 5 wt % of ZnO; 0 wt % to 2 wt % of WO3; 2 wt % to 10 wt % of ZrO2; more than 10 wt % but less than 15 wt % of BaO; 0 wt % to 5 wt % of CaO, SrO and MgO, wherein the content of SrO is 0 wt % to 3 wt %; and 0 wt % to 0.1 wt % of Sb2O3.

Abstract: Thin glasses having high refractive index (nd), a layer composite assembly made from these thin glasses, a method for the production of the thin glasses, and the uses of the thin glasses are provided. The thin glasses are processed in an in line manufacturing process and have the optical properties of a classical optical glass. The thin glasses are highly transparent, crystallization-resistant, chemically resistant and highly refractive. The viscosity/temperature behavior of the thin glasses is adjusted to the manufacturing process via in line flat glass methods.

Abstract: An optical glass, comprising, denoted as cation percentages: a content of Si4+ and B3+ (35 to 55); a combined content of La3+, Gd3+, and Y3+ (30 to 55), wherein Gd3+ is 5 to 20%; a content of Ti4+, Nb5+, Ta5+ and W6+ (7 to 20); Zr4+ (2 to 8); and Zn2+ (0 to 10); wherein a cation ratio of Zn2+ to Gd3+ is 0 to 0.80; a cation ratio of Gd3+ to Ti4+, Nb5+, Ta5+, and W6+ combined is 0.65 to 2.00; a cation ratio of Ta5+ to Ti4+, Nb5+, Ta5+, and W6+ combined is 0 to 0.30; a cation ratio of Ti4+ to Ti4+, Nb5+, Ta5+, and W6+ combined is 0.30 to 0.90; and a refractive index nd is 1.890 to 1.950, and an Abbé number ?d of equal to or lower than 39.0, the Abbé number ?d satisfying a relation of ?d?(2.334?nd)/0.012 relative to nd.

Abstract: Provided with the following glass components: 8 to 19.5% B2O3, 4.5 to 9% SiO2, 0 to 10% GeO2, 7 to 12.5% BaO, 0 to 14% MgO, 0 to 0.4% Li2O, 15 to 34% La2O3, 3.5 to 10% Y2O3, 8 to 13.5% TiO2, 0 to 7% ZrO2, 0 to 11% Nb2O5, and 1 to 9% WO3 by weight, wherein B2O3/SiO2 is at least 1.0, La2O3+Y2O3+ZrO2+Nb2O5+WO3 is no more than 54%, and B2O3+SiO2+GeO2+BaO+MgO+Li2O+La2O3+Y2O3+TiO2+ZrO2+Nb2O5+WO3 is at least 98%.

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.

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. %.

Abstract: The present invention is aimed to provide a cost-effective optical glass with refractive index of 1.74-1.80 and Abbe number of 47-51 but containing no Gd2O3 and an optical element made hereof. The optical glass contains the following components according to percentage by weight: more than 2.7% but less than 10% of SiO2, 20-31% of B2O3, 38-49% of La2O3, more than 12% but less than 20% of Y2O3, more than 1% but less than 4% of ZnO, more than 0.5% but less than 3% of Nb2O5, wherein the content of ZnO is more than that of Nb2O5, 0-5% of Ta2O5, 0-5% of RO, wherein the RO is one or more of CaO, SrO and MgO, and content of ZrO2 is more than 6.7% but less than 15%. The present invention is a lanthanum borate glass containing no Gd2O3. A stable glass can be obtained by adjusting the content of La2O3, B2O3 and Y2O3.

Abstract: An optical glass comprising, by mass %, 12 to 40% of SiO2, 15% or more but less than 42% of Nb2O5, 2% or more but less than 18% of TiO2, (provided that Nb2O5/TiO2 is over 0.6), 0.1 to 20% of Li2O, 0.1 to 15% of Na2O, and 0.1 to 25% of K2O, and having an Abbe's number ?d of 20 to 30, a ?Pg,F of 0.016 or less and a liquidus temperature of 1,200° C. or lower.

Abstract: The invention discloses an optical glass and an optical element. The optical glass comprises 0.1 wt % -8 wt % of SiO2, 20 wt % -32 wt % of B2O3, 20 wt % -35 wt % of La2O3, 15 wt % -30 wt % of Gd2O3, 1-6 wt % of Ta2O5, 1 wt % -15 wt % of ZnO, and 0.1 wt % -2 wt % of Li2O. The optical glass claimed in the invention has a refractive index of 1.75-1.8, an Abbe number of 45-52, a transformation temperature of less than 610° C., and a wavelength of less than 390 nm at 80% transmittance. Thus the claimed optical glass meets the requirements for a modern imaging device.

Abstract: There is provided an optical glass with a high refractive index and a low dispersion having a refractive index (nd) of not less than 1.75 and an Abbe's number (?d) of not less than 35 where the image formation characteristic is hardly affected by changes in temperature of the using environment. SiO2, B2O3 and La2O3 are contained as essential components and the ratio of the constituting components are adjusted whereby an optical glass in which a product of ? and ? where ? is an average linear expansion coefficient at ?30 to +70° C. and ? is an optical elasticity constant at the wavelength of 546.1 nm is not more than 130×10?12° C.?1×nm×cm?1×Pa?1 is able to be achieved.

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.

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.

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.

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.

Abstract: There is provided an optical glass with a high refractive index and a low dispersion having a refractive index (nd) of not less than 1.75 and an Abbe's number (?d) of not less than 35 where the image formation characteristic is hardly affected by changes in temperature of the using environment. SiO2, B2O3 and La2O3 are contained as essential components and the ratio of the constituting components are adjusted whereby an optical glass in which a product of ? and ? where ? is an average linear expansion coefficient at ?30 to +70° C. and ? is an optical elasticity constant at the wavelength of 546.1 nm is not more than 130×10?12° C.?1×nm×cm?1×Pa?1 is able to be achieved.

Abstract: An optical glass having optical constants of a refractive index (nd) of 1.78 or over, an Abbe number (?d) of 30 or below, and a partial dispersion ratio (?g, F) of 0.620 or below comprises SiO2 and Nb2O5 as essential components, wherein an amount of Nb2O5 in mass % is more than 40%. The optical glass further comprising, in mass % on oxide basis, less than 2% of K2O and one or more oxides selected from the group consisting of B2O3, TiO2, ZrO2, WO3, ZnO, SrO, Li2O and Na2O wherein a total amount of SiO2, B2O3, TiO2, ZrO2, Nb2O5, WO3, ZnO, SrO, Li2O and Na2O is more than 90% and TiO2/(ZrO2+Nb2O5) is less than 0.32.

Abstract: A process for producing a glass in the production of a glass molded article formed of an optical glass by melting and clarifying a glass raw material to prepare a molten glass and molding said molten glass, the process comprising preparing a glass raw material that gives an oxide glass comprising, by cationic %, 12 to 65% of B3+, 0 to 20% of Si4+, 0 to 6% of Ge4+, 15 to 50% of total of La3+, Gd3+, Y3+, Yb3+, Sc3+ and Lu3+, 4 to 54% of total of Ta5+, Zr4+, Ti4+, Nb5+, W6+ and Bi3+, 0 to 35% of Zn2+, 0 to 9% of total of Li+, Na+ and K+, and 0 to 15% of total of Mg2+, Ca2+, Sr2+ and Ba2+, a total content of said cationic components in the oxide glass being 99 to 100%, and said glass raw material comprising carbonate and sulfate.

Abstract: A crystallizing glass solder for high-temperature applications, containing, in % by weight on an oxide basis: 45% to 60% of BaO, 25% to 40% of SiO2, 5% to 15% of B2O3, 0 to <2% of Al2O3, and at least one alkaline earth metal oxide from the group consisting of MgO, CaO and SrO, wherein CaO is 0% to 5% and the sum of the alkaline earth metal oxides MgO, CaO and SrO is 0% to 20%, preferably 2% to 15%. The glass solder is preferably free from TeO2 and PbO. Preferred embodiments of the glass solder contain from 3 to 15 wt. % of Y2O3 and have low porosity and high stability with respect to a moist fuel gas environment.

Abstract: The present invention relates to an optical glass, a preform for precision press molding, methods for manufacturing the same, and an image pickup device. The optical glass of the present invention not only has a high refractive index, a high dispersion property, and good precision press moldability, but also has good stability with respect to devitrification when reheated (referred to as “devitrification stability upon reheating”), and is an optical glass with a good partial dispersion ratio (Pg, F).

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.

Abstract: A highly refractive and highly transparent optical glass is provided. The use of such a glass, optical elements and processes for producing the glass or the optical elements are also provided.