Abstract: The purpose of the present invention is to obtain, at a lower cost: an optical glass that has a low temperature coefficient regarding the relative refractive index and that can contribute to correcting the effect of temperature change on image-forming characteristics; and a preform and an optical element that use such an optical glass. This optical glass contains, in mass %, 1.0-27.0% of a SiO2 component, a total of 5.0-34.0% of a Ln2O3 component (wherein, Ln represents at least one selected from the group consisting of La, Gd, Y, and Yb), and more than 30.0% but not more than 65.0% of a BaO component, wherein the contained amount of a B2O3 component is at most 25.0%, and the temperature coefficient (40-60° C.) of the relative refractive index (589.29 nm) falls within the range between +3.0×10?6 and ?10.0×10?6 (° C.?1).

Abstract: There are provided an optical glass that can compensate for chromatic aberration of glass lenses with high precision because of its high anomalous dispersion, that is lighter than that in the related art, and that is easily handled in a polishing process because of its low degree of abrasion, an optical element, and a preform. The optical glass contains P5+, Al3+, and Zn2+ as cation components and O2? and F? as anion components, wherein the cation components are P5+ 25% to 40%, Al3+ 5% to 20%, Zn2+ 1% to 15%, and Ba2+ 0% to 28% on a cat. % basis, the anion components are O2? 40% to 70% and F? 30% to 60% on an ani. % basis, and the optical glass has a refractive index (nd) of 1.53 to 1.60, an Abbe number (?d) of 65 to 75, a partial dispersion ratio ?g.f of 0.520 to 0.560, and a degree of abrasion of 420 or less.

Abstract: Provided is an optical glass that has optical characteristics including a high refractive index and low dispersion, that exhibits a low value with respect to the temperature coefficient of the relative refractive index thereof, and that can contribute to correcting the impact of changes in temperature on image formation characteristics.

Abstract: Provided is an optical glass which has optical properties including a high refractive index and high dispersibility, and can contribute to the correction of the influence of the change in temperature on image formation properties. The optical glass contains, in % by mass, a B2O3 component in an amount of more than 0% and equal to or less than 35.0%, a Ln2O3 component (wherein Ln represents at least one element selected from the group consisting of La, Gd, Y and Yb) in a total amount of 1.0 to 50.0% inclusive, and a BaO component in an amount of 10.0 to 50.0% inclusive, wherein the total mass of TiO2+ZrO2+WO3+Nb2O5+Ta2O5 is more than 0% and equal to or less than 50.0%. The optical glass has a refractive index of 1.75 or more and an Abbe's number of 18 to 42 inclusive, wherein the temperature coefficient (40 to 60° C.) of a relative refractive index (589.29 nm) falls within the range from +4.0×10?6 to ?10.0×10?6 (° C.?1).

Abstract: The CPU of a personal computer displays a list of one-click icons, each representing one or a plurality of printing functions, in the icon display area, and selects one one-click icon from the list of the one-click icons displayed in the icon display area, to automatically set a plurality of printing functions corresponding to the selected one-click icons.

Abstract: The CPU of a personal computer displays a list of one-click icons, each representing one or a plurality of printing functions, in the icon display area, and selects one one-click icon from the list of the one-click icons displayed in the icon display area, to automatically set a plurality of printing functions corresponding to the selected one-click icons.

Abstract: The CPU of a personal computer displays a list of one-click icons, each representing one or a plurality of printing functions, in the icon display area, and selects one one-click icon from the list of the one-click icons displayed in the icon display area, to automatically set a plurality of printing functions corresponding to the selected one-click icons.

Abstract: The CPU of a personal computer displays a list of one-click icons, each representing one or a plurality of printing functions, in the icon display area, and selects one one-click icon from the list of the one-click icons displayed in the icon display area, to automatically set a plurality of printing functions corresponding to the selected one-click icons.

Abstract: The CPU of a personal computer displays a list of one-click icons, each representing one or a plurality of printing functions, in the icon display area, and selects one one-click icon from the list of the one-click icons displayed in the icon display area, to automatically set a plurality of printing functions corresponding to the selected one-click icons.

Abstract: Provided is optical glass that does not contain lead, which is an environmental pollutant. The optical glass is ideal for the transmission of light even after being exposed to X-rays, and has a high refractive index. The optical glass comprises, by mass % in terms of oxide versus the glass total mass, 1.0% to 60.0% of an SiO2 component, and one or more selected from the group consisting of an La2O3 component, ZrO2 component, TiO2 component, Nb2O5 component, and Ta2O5 as essential components. The optical glass has a refractive index (nd) of 1.50 or greater, and has a light intensity recovery rate of 45% or greater when the glass having been irradiated with X-rays with a dose of 2.5 Gy is irradiated with light of a xenon lamp for 11 hours.

Abstract: The CPU of a personal computer displays a list of one-click icons, each representing one or a plurality of printing functions, in the icon display area, and selects one one-click icon from the list of the one-click icons displayed in the icon display area, to automatically set a plurality of printing functions corresponding to the selected one-click icons.

Abstract: The CPU of a personal computer displays a list of one-click icons, each representing one or a plurality of printing functions, in the icon display area, and selects one one-click icon from the list of the one-click icons displayed in the icon display area, to automatically set a plurality of printing functions corresponding to the selected one-click icons.

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: The CPU of a personal computer displays a list of one-click icons, each representing one or a plurality of printing functions, in the icon display area, and selects one one-click icon from the list of the one-click icons displayed in the icon display area, to automatically set a plurality of printing functions corresponding to the selected one-click icons.

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: The CPU of a personal computer displays a list of one-click icons, each representing one or a plurality of printing functions, in the icon display area, and selects one one-click icon from the list of the one-click icons displayed in the icon display area, to automatically set a plurality of printing functions corresponding to the selected one-click icons.

Abstract: The CPU of a personal computer displays a list of one-click icons, each representing one or a plurality of printing functions, in the icon display area, and selects one one-click icon from the list of the one-click icons displayed in the icon display area, to automatically set a plurality of printing functions corresponding to the selected one-click icons.

Abstract: The CPU of a personal computer displays a list of one-click icons, each representing one or a plurality of printing functions, in the icon display area, and selects one one-click icon from the list of the one-click icons displayed in the icon display area, to automatically set a plurality of printing functions corresponding to the selected one-click icons.

Abstract: The CPU of a personal computer displays a list of one-click icons, each representing one or a plurality of printing functions, in the icon display area, and selects one one-click icon from the list of the one-click icons displayed in the icon display area, to automatically set a plurality of printing functions corresponding to the selected one-click icons.

Abstract: An optical glass has a refractive index (nd) of 1.60 or over and excellent transmittance and internal quality. The optical glass comprises 0.1-4 mass % of Ta2O5 to total mass of glass calculated on oxide basis, has ratio of 0.95<Ta2O5/(Ta2O5+(ZrO2)+TiO2+Nb2O5+WO3)×5)?1.00, and further comprises SiO2+B2O3+Al2O3+BaO in a total amount of 81% or over.