77results about How to "High Abbe number" patented technology

A subject for the invention relates to processes for producing a polycarbonate containing a plant-derived starting material and to molded articles thereof, the polycarbonate having excellent mechanical strength, heat resistance, a low refractive index, a large Abbe number, low birefringence, and excellent transparency. The invention relates to a process for producing a polycarbonate which includes a step in which one or more dihydroxy compounds including a dihydroxy compound having at least one linking group —CH₂—O— in the molecule thereof are reacted with a carbonic acid diester in the presence of a polymerization catalyst, wherein the dihydroxy compound having at least one linking group —CH₂—O— in the molecule thereof has a formic acid content lower than 20 ppm. The invention further relates to a molded article constituted of a polycarbonate or a composition of the polycarbonate, the polycarbonate being a polycarbonate which contains constituent units derived from a dihydroxy compound having at least one linking group —CH₂—O— in the molecule thereof and has an Abbe number of 50 or larger and a 5% weight loss temperature of 340° C. or higher.

The invention discloses an environmentally friendly low-dispersion chalcogenide glass and a preparation method thereof. The chalcogenide glass comprises, by mass, 14-18% of Ge, 7-28% of Sb, 57-70% of Se, and 0-5% of Te. Composition components of the chalcogenide glass do not contain As, the Abbe number of the chalcogenide glass disclosed in the invention is higher than the Abbe number of As-containing chalcogenide glass Ge22As20Se58 of 119.55, the Abbe number of commercial Ge20 (Ge20Sb15Se65) of 100.58 and the Abbe number of commercial Ge28 (Ge28Sb12Se60) of 102.15, and the V8-12 of the chalcogenide glass is the ratio of (n10-1)/(n8-n12) and is 120-130; and the chalcogenide glass has a good infrared transmittance performance, can be stably produced in batches, and can be used in infrared night vision lenses. The preparation method of the environmentally friendly low-dispersion chalcogenide glass is characterized in that a glass raw material tube and a purified glass tube are respectively placed in two hearths with different temperatures, and glass is purified by controlling a temperature difference between the two hearths, so the highly pure chalcogenide glass with uniform optical quality and good infrared light transmittance is obtained.

An optical material of the present invention includes: a phosphor which has an excitation wavelength in a range from 220 nm to 500 nm, a fluorescence wavelength in a range from 380 nm to 650 nm, a maximum excitation wavelength in a range from 350 nm to 400 nm, and a maximum fluorescence wavelength in a range from 400 nm to 500 nm; and an ultraviolet light absorber, and the light transmittance thereof measured at a thickness of 2 mm satisfies the following features (1) to (3):

• • (1) The light transmittance at a wavelength of 440 nm is 80% or higher.
  • (2) The light transmittance at a wavelength of 420 nm is 70% or lower.
  • (3) The light transmittance at a wavelength of 410 nm is 5% or lower.

The invention relates to ytterbium-doped fluophosphate laser glass and a preparation method thereof. The glass comprises phosphate, fluoride and little oxide, wherein cation contains the following elements in mole percentage: 21.0-35.0 mol percent of P<5+>, 10.0-28.0 mol percent of Al<3+>, 6.0-15.0 mol percent of Mg<2+>, 9.5-13.0 mol percent of Ca<2+>, 8.0-13.0 mol percent of Se<2+>, 4.5-11.3 mol percent of Ba<2+>, 0-27.0 mol percent of Li<+>, 2.0-5.0 mol percent of Na<+>, 0-1.0 mol percent of Nb<5+> and 1.0-3.0 mol percent of Yb<3+>. The glass is prepared by adopting the traditional fusion method. The fluorescence lifetime of Yb<3+> is from 1.70ms to 2.3ms in a 2mm sample, and the Abbe number is between 73.4 and 81.8. Proved by experiments, the ytterbium-doped laser glass is a practical medium material for outputting ultrahigh power and ultrashort pulse laser.

The invention discloses a photochromic resin lens with refractive index of 1.50. The photochromic resin lens with refractive index of 1.50 comprises the following materials: a resin monomer, an initiator and color changing liquid based on the ratio of 100:(0.5-3.0):(1.0-4.0); the resin monomer is a mixture of diglycol allyl carbonate and a polymer of diglycol allyl carbonate; the initiator is one or the mixture of peroxide-2-ethylhexyl tert-butyl carbonate, peroxide-2-ethylhexyl tert-amyl carbonate and 1,1-bi(tert-butyl peroxide)-3,3,5-trimethyl-cyclohexane; the color changing liquid is a photochromic organic material dissolved with an organic solvent. The preparation method comprises the following steps: (1) weighting the resin monomer, the initiator and the color changing liquid based on the ratio, and uniformly mixing; (2) casting; (3) thermally curing for the first time; (4) opening a die, turning the edge, and washing; (5) thermally curing for the second time for 2 hours at the temperature of 110 DEG C; (6) checking and warehousing. The prepared photochromic resin lens with refractive index of 1.50 is high in abbe number, clear in imaging, and suitable for a customer wearing; the visible light transmittance after the color changing is equal to or less than 30%.

The transparent polycrystalline optoceramic has single crystallites and at least 95 percent by weight of the single crystallites have a cubic pyrochlore or fluorite structure. The optoceramic is composed of an oxide of stoichiometry:

A_2+xB_yD_zE₇

wherein 0<x<1, 0<y<2, 0<z<1.6 and 3x+4y+5z=8; wherein A is at least one trivalent rare earth cation; B is at least one tetravalent cation; D is at least one pentavalent cation; and E comprises at least one divalent anion. Refractive, diffractive or transmissive optical elements are made with these optoceramics.

A material for the lens with gradient refractivity is prepared from thallium oxide 30-45 wt%, sodium (or potassium) oxide 5-12%, zinc oxide 6-12%, SiO2 34-50%, calcium oxide 0-5%, Al2O3 1-6%, zirconium oxide 0-2%, La2O5 0-5% and B2O3 0-10% through compounding, smelting, drawing into filament, ion exchange, surface treating and examining. Its advantages are less color difference, less volatilization in smelting, high Abbe number and high consistence.

The polymerizable composition for optical materials of the present invention includes: (A) a compound having a carbon-carbon double bond and at least one group selected from an isocyanate group and an isothiocyanate group in a molecule; and (B) a polythiol compound.

The invention provides polycarbonate and a preparation method and application thereof, the polycarbonate comprises a repeating unit with a structure as shown in a formula I, and the repeating unit comprises a specific dithionaphthalene group, so that the polycarbonate has high refractive index, high Abbe number and excellent hydrothermal stability, and the performance requirements of polycarbonateserving as optical resin in optical parts can be fully met. The refractive index of the polycarbonate reaches up to 1.66-1.75, the Abbe number is 20-40, and the polycarbonate has high transparency, high refractive index, high Abbe number and excellent hydrothermal stability, and can fully meet the application requirements of polycarbonate materials in high-performance optical components. The optical lens comprising the polycarbonate has the characteristics of lightness, thinness, low chromatic aberration and low chromatic dispersion, and provides more selectivity for the combination of optical systems.

Disclosed is a polythiocarbonate resin containing a repeating unit represented by the general formula (I) below, which is high in transparency, refractive index and Abbe number while being excellent in heat resistance and impact resistance. Also disclosed is an optical material using such a polythiocarbonate resin. Further disclosed is a sulfur-containing compound having an Abbe number of not less than 40 which has a high refractive index, high Abbe number, excellent transparency and excellent heat resistance, and is obtained by reacting a dithiol compound represented by the general formula (II) below with a diene compound represented by the general formula (III) below, so that it contains a repeating unit composed of a structural unit derived from the residue of the dithiol compound and a structural unit derived from the residue of the diene compound. Still further disclosed are a method for producing such a sulfur-containing compound, a sulfur-containing polymer including such a sulfur-containing compound as a constitutional unit, and an optical material containing such a polymer.

The invention relates to a manufacturing technology for a resin lens with high refraction index and high abbe number. The manufacturing technology is implemented through the following steps: cleaning a mould, and then assembling the mould; adding a component B, a component C and an ultraviolet light absorbent into a mixing barrel, and uniformly mixing; adding a catalyst, a release agent, a blue organic pigment and a red organic pigment, uniformly mixing, adding a component A, and uniformly mixing; filtering, then, injecting raw materials into the assembled mould, and sealing the mould; performing primary solidification on the filled mould, prying the solidified mould, and separating out the mould and molded lenses; trimming the lenses; performing multi-grooved ultrasonic cleaning and secondary solidification on the trimmed lenses; inspecting the lenses subjected to the secondary solidification, and selecting a qualified lens; coating the qualified lens with a film, then, performing hardening solidification on the lens coated with the film; evaporating an antireflection film on the hardened lens. The refraction index of the lens manufactured by adopting the manufacturing technology is 1.693-1.701, and the abbe number of the lens is 34-37.

A method for preparing optical film includes mixing PMMA mixture with solvent uniformly to form a wet film, heating said wet film to form an optical dried film, enabling to mix PMMA mixture in any ratio as per required property with solvent to form a mixed solution then carrying out heat treatment on mixed solution to obtain optical film.

The invention discloses a large wide-angle video lens with a focal length of 8mm, and the lens sequentially comprises a first lens group, a second lens group, a third lens group, a fourth lens group and a fifth lens group from an object side to an image side, the first lens group has positive focal power and is fixed in position, the second lens group has positive focal power and can move along the direction of the optical axis; the first lens group comprises a first negative lens group and a second negative lens group. The first negative lens group comprises at least three negative lenses; the second negative lens group comprises a positive-negative cemented lens with negative focal power and a negative-positive cemented lens with positive focal power, the first lens group is provided with three negative lenses, so that the lens has a large wide angle, the light transmission amount and the resolution of the edge part of the lens can be increased, and the chromatic aberration and the distortion can be corrected due to the arrangement of the two cemented lenses which are matched with each other.

A composition for an optical material includes (a) a compound having two β-epithiopropyl groups and having a specific structure, (b) a compound having one β-epithiopropyl group and one glycidyl group and having a specific structure, (c) polyisocyanate and (d) polythiol, enables the prevention of the occurrence of such a defect that peeling traces linger on a lens. In the composition for an optical material, an embodiment in which (e) sulfur is additionally contained is preferred. Another embodiment of the present invention is a method for producing an optical material, characterized by adding an onium salt as a polymerization catalyst to the composition for an optical material in an amount of 0.0001 to 10% by mass relative to the total amount of the compound (a), the compound (b), polyisocyanate (c) and polythiol (d) and then polymerizing and curing the resultant mixture.

A thermoplastic polyester including: at least one 1,4:3,6-dianhydrohexitol unit (A); at least one cyclic diol unit (B) other than cyclohexanedimethanol units and 1,4:3,6-dianhydrohexitol units (A); and at least one aromatic carboxylic diacid unit (C), the polyester being free from ethylene glycol units. It also relates to the production method and use of same.