60results about How to "Low Abbe number" patented technology

The present invention is an imaging lens in which various aberrations are favorably corrected, the optical length is short, and a sufficient back focus is secured. The imaging lens is constituted by arranging a first lens L1, an aperture diaphragm S1, a second lens L2, and a third lens L3 in succession from the object side to the image side. The first lens L1 is a lens having a positive refractive power and a meniscus shape in which the convex surface faces the object side, the second lens L2 is a lens having a negative refractive power and a meniscus shape in which the convex surface faces the image side, and the third lens L3 is a lens in which the convex surface faces the object side. The imaging lens satisfies the following conditions:

• • 0.35<r₁/r₂<0.45 (1)
  • 0.07<D₂/f<0.1 (2)
  • 0.01<D₄/f<0.04 (3) 1.00<d/f<1.30 (4)
  • 0.3<b_f/f<0.5 (5) where f is the combined focal length of the imaging lens,
  • r₁ is the radius of curvature (axial radius of curvature) of the object-side surface of the first lens L1 in the vicinity of the optical axis,
  • r₂ is the radius of curvature (axial radius of curvature) of the image-side surface of the first lens L1 in the vicinity of the optical axis,
  • D₂ is the distance between the first lens L1 and second lens L2,
  • D₄ is the distance between the second lens L2 and third lens L3,
  • d is the distance (atmospheric) from the object-side surface of the first lens L1 to the imaging surface, and
  • b_f is the distance (atmospheric) from the image-side surface of the third lens to the imaging surface.

According to one embodiment, a polyester resin is provided, which includes a structural unit derived from a compound represented by general formula (1), a structural unit derived from a compound represented by general formula (2), and a structural unit derived from a dicarboxylic acid or a derivative thereof.

The present invention relates to a polarized light board structure which is provided with a polarized light layer, a first optical film and a second optical film, the first optical film is formed above the polarized light layer and the second optical film is formed below the polarized light layer, wherein, at least one optical film selected from the first optical film and the second optical film is polymethyl methacrylate optical film. Into the bargain, the optical film is formed by pasting the mixed solution to the polarized light board and doing heat treatment when penetrating the mixed solution and distributing on the substrate to prepare for making have finished, or the optical film is formed by penetrating the mixed solution and distributing on the substrate and doing thermal treatment.

The invention provides a novel optical glass which has a refractive index (nd) of 1.78 to 2.2 and an Abbe value (νd) 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 (νd) 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.

The invention provides stable polycarbonate resin with high refractive index and a preparation method and application thereof. The polycarbonate resin comprises a structural unit as shown in a formula A and optional structural units as shown in a formula B and a formula C. The polycarbonate resin is high in refractive index, good in stability, and capable of meeting the use requirements of optical lenses; the manufacturing method is simple, and has the industrial application prospect.

Disclosed is a curable composition having a proper viscosity and excellent handing properties. Also disclosed is a cured article which is characterized by being produced by curing the curable composition, having excellent transparency, heat resistance and environmental resistance and a low Abbe's number, and which, when produced using the curable composition in combination with a material having a high Abbe's number, can have a reduced chromatic aberration. The curable composition is characterized by comprising (a) silica microparticles, (b) a (meth)acrylate compound having at least two ethylenically unsaturated groups and having no ring structure, (c) a (meth)acrylate compound having at least two ethylenically unsaturated groups and also having an aromatic ring structure, and (d) a polymerization initiator, wherein the surfaces of the silica microparticles (a) are treated with a specific silane compound (e) and a specific silane compound (f).

The invention discloses an optical polycarbonate resin for an optical lens, a preparation method and application thereof, wherein the polycarbonate resin comprises a structural unit as shown in a general formula (1), and has higher refractive index, better hardness and proper processing temperature. The optical lens prepared from the polycarbonate resin has the advantages of high refractive index,low Abbe number and high stability, so the optical lens can be used in the high-end fields of telescopes, binocular telescopes, unmanned lenses, VR/AR lenses and the like.

The present invention provides a polycarbonate resin having a high refractive index, low Abbe number, and high moist heat resistance. The above problem, according to one embodiment, can be solved by a polycarbonate resin including structural units represented by general formula (1).

A curable resin composition comprising a (meth)acrylate monomer having an aromatic ring, a non-conjugated vinylidene group-containing compound represented by the general formula below, and a thermal or a photo-radical polymerization initiator makes it possible to produce a cured product with minimized occurrence of burring during molding and high product yield after molding. The cured product has good heat coloration resistance and low Abbe's number. R¹¹, R¹², R¹⁵, and R¹⁶ represent a substituent and A represents an atomic group necessary for forming a cyclic structure.

The invention discloses optical polycarbonate resin for an optical lens, a preparation method and application thereof, wherein the polycarbonate resin comprises a structural unit shown in a general formula (1), can reach a high refractive index of 1.7 or above and has good hardness and a proper processing temperature. The optical lens prepared from the polycarbonate resin has the advantages of high refractive index, low Abbe number and high stability, so the optical lens can be used in the high-end fields of telescopes, binocular telescopes, unmanned lenses, VR/AR lenses and the like.

The invention discloses optical polycarbonate and a preparation method thereof, the optical polycarbonate comprises a structural unit shown in the following general formula (1), and the structural unit can be prepared by reacting a dihydroxy compound corresponding to the structure of the general formula (1) with carbonic acid diester. The obtained polycarbonate resin is high in refractive index and easy to form, and can be applied to the field of optical polycarbonate such as optical lenses.

A cured product of a compound of the following formula has a low Abbe number and a high abnormal dispersibility. X and Y are O, S, N or S; Z and X—C═C—Y form 5 to 7-membered ring; R¹ and R² represents H, alkoxy, mercapto, thioalkoxy, amino, alkylamino, carboxy, alkylcarbonyloxy, carbamoyloxy or alkoxycarbonyloxy; and R³ to R⁶ represent substituent.

The invention provides polycarbonate resin, a preparation method and a formed optical component. The polycarbonate resin comprises polycarbonate with a structural unit as shown in the following formula; In the formula, R1-R2 each independently represents a hydrogen atom, a hydroxyl group, an alkyl group having 1-20 carbon atoms, an alkoxy group having 1-20 carbon atoms, a cyclic carbon group having 5-20 carbon atoms, a cyclic carbon oxygen group having 5-20 carbon atoms, an aryl group having 6-20 carbon atoms, or an aryloxy group having 6-20 carbon atoms; X represents an alkylene group having1-6 carbon atoms; and n is any integer between 1 and 10. The polycarbonate resin prepared by the invention has the advantages of high refractive index, low birefringence and small Abbe number.

An imaging lens comprising a polycarbonate that contains formulae (1) and (2) in the proportions indicated below, said imaging lens having a specific refractive index and Abbe number, and having the physical characteristics of a low birefringence and coefficient of water absorption. 50 mol%<=(1)<70 mol%; 30 mol%<(2)<=50 mol%.

The invention provides an optical glass useful for correcting chromatic aberration of optical elements and a pre-form body using the optical glass. The optical glass satisfies the following conditions: according to components converted into oxide, the optical glass comprises Bi2O2, SiO2 and/or B2O3 and F components; a part dispersion rate [theta g,F] is more than 0.63; an abbe number [vd] is below 27; the part dispersion rate [theta g,F] is greater than -0.0131*[vd]+0.9000.

A camera lens is disclosed. The camera lens includes, in an order from an object side to an image side, a first lens with a positive refractive power; a second lens with a negative refractive power; a third lens with a positive refractive power; and a fourth lens with a negative refractive power. The camera lens further satisfies specific conditions.

A polymerizable composition includes 100 parts by mass of a reactive polysiloxane being a polycondensation product of an alkoxy silicon compound including at least an alkoxy silicon compound of formula [1], and 10 to 500 parts by mass of a polymerizable compound having at least one polymerizable double bond.

(X is a phenyl group having at least one substituent having a polymerizable double bond, a naphthyl group having at least one substituent having a polymerizable double bond, a biphenyl group having at least one substituent having a polymerizable double bond, or a phenanthryl group having at least one substituent having a polymerizable double bond, Ar¹ is a condensed ring hydrocarbon group having two or more benzene ring structures, or a hydrocarbon ring assembly group in which two or more aromatic rings are directly bonded through a single bond, and R¹ is methyl group, ethyl group, or isopropyl group).