摘要:
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%).
摘要:
[Problems to be Solved]To provide a high-refractivity low-dispersion optical glass that enables the stable production of high-quality optical elements.[Means to Solve the Problems]An optical glass comprising, as essential components, 20 to 50% of B3+, 5 to 35% of La3+, 1 to 30% of Nb5+, 0.5 to 15% of Ta5+, and 11 to 40% of Zn2+, the total content of B3+ and Si4+ being 20 to 50%, the total content of La3+, Gd3+ and Y3+ being 5 to 35%, the cationic ratio of ((B3++Si4+)/(La3++Gd3++Y3+)) being from 1 to 5, the total content of Ti4+, Nb5+, Ta5+ and W6+ being 10 to 35%, the cationic ratio of ((Nb5++Ta5+)/(Ti4++Nb5++Ta5++W6+)) being from 0.7 to 1, the cationic ratio of ((B3++Si4+)/(Ti4++Nb5++Ta5++W6+)) being from 0.5 to 4, the cationic ratio of ((La3++Gd3++Y3+)/(Ti4++Nb5++Ta5++W6+)) being from 0.2 to 3, the cationic ratio of Zn2+/Zn2++Mg2++Ca2++Sr2++Ba2+) being from 0.8 to 1, the optical glass having a refractive index nd of 1.89 or more and an Abbe's number νd of 27 to 37.
摘要:
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.
摘要:
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%).
摘要:
[Problems to be Solved]To provide a high-refractivity low-dispersion optical glass that enables the stable production of high-quality optical elements.[Means to Solve the Problems]An optical glass comprising, as essential components, 20 to 50% of B3+, 5 to 35% of La3+, 1 to 30% of Nb5+, 0.5 to 15% of Ta5+, and 11 to 40% of Zn2+, the total content of B3+ and Si4+ being 20 to 50%, the total content of La3+, Gd3+ and Y3+ being 5 to 35%, the cationic ratio of ((B3++Si4+)/(La3++Gd3++Y3+)) being from 1 to 5, the total content of Ti4+, Nb5+, Ta5+ and W6+ being 10 to 35%, the cationic ratio of ((Nb5++Ta5+)/(Ti4++Nb5++Ta5++W6+)) being from 0.7 to 1, the cationic ratio of ((B3++Si4+)/(Ti4++Nb5++Ta5++W6+)) being from 0.5 to 4, the cationic ratio of ((La3++Gd3++Y3+)/(Ti4++Nb5++Ta5++W6+)) being from 0.2 to 3, the cationic ratio of Zn2+/Zn2++Mg2++Ca2++Sr2++Ba2+) being from 0.8 to 1, the optical glass having a refractive index nd of 1.89 or more and an Abbe's number νd of 27 to 37.
摘要:
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.
摘要:
A fixing device includes a nip formation pad disposed opposite an inner circumferential surface of an endless belt and a pressing rotary body pressed against the nip formation pad via the endless belt to form a fixing nip between the endless belt and the pressing rotary body, through which a recording medium is conveyed. The pressing rotary body has a diameter increasing from a center to each lateral end in an axial direction thereof. The nip formation pad includes a projection disposed downstream from a rotation axis of the pressing rotary body in a recording medium conveyance direction. The projection projects toward the pressing rotary body in an amount increasing from each lateral end to a center in a longitudinal direction of the nip formation pad parallel to the axial direction of the pressing rotary body.
摘要:
A method for manufacturing an optical glass element, comprising: annealing a press-molded product obtained by press molding into a lens shape a glass material comprised of a core portion comprised of an optical glass (first glass) with a transition temperature of 550° C. or higher and a covering portion comprised of a second glass covering the surface of said core portion; and then removing the covering layer from the surface of the press-molded product to obtain an optical glass element. To provide a method for manufacturing high-optical-performance mold-pressed lenses in which the defective external appearance of optical elements comprised of high-temperature glass materials with a Tg of 550° C. or higher is prevented.
摘要:
A composition for an adhesive hydrogel, comprising at least: a polymeric matrix former; water; and a polyhydric alcohol; the polymeric matrix former comprising at least: (a) (meth)acrylic acid, a (meth)acrylic acid derivative or a vinyl derivative having 2 carboxyl groups and 4 or 5 carbon atoms; (b) (meth)acrylamide or a (meth)acrylamide derivative; (c) N-vinyl-2-caprolactam and/or N-vinyl-2-valerolactam; and (d) a cross-linkable monomer, wherein the content percentage of the (b) in the composition for an adhesive hydrogel is 2 to 20% by weight.
摘要:
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.