581 results about "Abbe number" patented technology

The invention provides an optical imaging lens and imaging equipment, and belongs to the technical field of optical imaging. The optical imaging lens comprises a first lens with negative focal power, a second lens with positive focal power, a diaphragm, a third lens with negative focal power, a fourth lens with positive focal power, a fifth lens with positive focal power, a sixth lens with negative focal power, a seventh lens with positive focal power and an eighth lens with negative focal power which are sequentially arranged in the direction of an optical axis. The image side surface of the first lens is a concave surface, the Abbe number of the fourth lens is greater than that of the third lens, the object side surface and the image side surface of the fifth lens are rotationally symmetrical aspheric surfaces, the object side surface of the sixth lens is a concave surface, and the Abbe number of the seventh lens is greater than that of the sixth lens; the object side surface and the image side surface of the eighth lens are rotationally symmetrical aspheric surfaces and are respectively a concave surface and a convex surface, and the optical imaging lens meets set optical parameter conditions. According to the invention, the requirements of miniaturization, large wide angle, large aperture and high imaging quality can be met.

The embodiment of the invention provides an eyepiece system and optical equipment. The eyepiece system comprises a first element group and a second element group; the first element group is arranged close to the human eye side and comprises a first lens, the first lens is provided with a first surface close to the display side and a second surface close to the human eye side, the first surface is provided with a light splitting element and a circularly polarized light generation assembly, and the circularly polarized light generation assembly is located on the side, away from the first lens, of the light splitting element; a first phase retarder and a polarization reflection element are sequentially arranged on the second surface; the second element group is arranged close to the display side and comprises at least two lenses, and the Abbe number of at least one lens is less than or equal to 40; the eyepiece system satisfies the following conditions: 0.01 < = (D1max * phi1) / (D2max * phi2) < = 0.3; wherein phi 1 is the focal power of the first element group, phi 2 is the focal power of the second element group, D1 is the maximum effective optical aperture of the first element group, and D2 is the maximum effective optical aperture of the second element group.

An image formation lens (IL) for a microscope comprises: a negative lens; and a positive lens (L13) that satisfies the following conditional expression:-0.002×(ν⁢dP-35)+0.602-θ⁢gFP<023<ν⁢dP<65where vdP: an Abbe number of the positive lens, and θgFP: a partial dispersion ratio of the positive lens that is defined by the following expression: θgFP=(ngP−nFP) / (nFP−nCP) where ngP is a refractive index of the positive lens to a g-line, nFP is a refractive index of the positive lens to an F-line, and nCP is a refractive index of the positive lens to a C-line.

The utility model relates to an optical lens, which sequentially comprises a first lens, a second lens, a third lens and a fourth lens along the optical axis from the object side to the image side, a first lens with positive focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with positive focal power, a fifth lens with negative focal power, a sixth lens with positive focal power, a seventh lens with negative focal power and an eighth lens with negative focal power are included. The combined effective focal length of the first lens and the second lens is F12, and the Abbe number Vd1 of the first lens and the Abbe number Vd2 of the second lens meet the following relation: F12 / (Vd1-Vd2) is greater than or equal to 1 and less than or equal to 4.85. The optical lens at least has one of the characteristics of large field of view, miniaturization, large target surface, high resolution, low distortion and the like.

An imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, sequentially disposed at intervals from an object side of the imaging lens system. The imaging lens system satisfies 1.5<Nd5<1.6, 30<V5<50, and TTL / 2IH<0.730, where Nd5 is a refractive index of the fifth lens, V5 is an Abbe number of the fifth lens, TTL is a distance from an object side surface of the first lens to an imaging plane, and 2IH is a diagonal length of the imaging plane.

The invention discloses an optical imaging lens. The optical imaging lens comprises a lens barrel, an optical lens group and a spacing element group, wherein the optical lens group and the spacing element group are arranged in the lens barrel. The optical lens group sequentially comprises a first lens with negative focal power, a second lens with positive focal power and a third lens with positive focal power from the object side to the image side along the optical axis. Wherein the object side surface of the first lens is a concave surface, and the image side surface is a concave surface; the image side surface of the second lens is a convex surface; the object side surface of the third lens is a convex surface. The spacer element group includes a second spacer element disposed on and in contact with the image side surface of the second lens. Half Semi-FOV of the maximum field angle of the optical imaging lens meets the following condition: 71 degrees < Semi-FOV < = 74.5 degrees; and the Abbe number V2 of the second lens, the inner diameter d2s of the object side surface of the second spacing element and the inner diameter d2m of the image side surface of the second spacing element meet the condition that V2 / (d2s + d2m) is greater than 3.20 mm <-1 > and less than 5.60 mm <-1 >.

The invention relates to the technical field of novel high-end polyolefin, in particular to a high-refractive-index transparent cycloolefin copolymer and a preparation method thereof. The cycloolefin copolymer has a structure as shown in a formula I: # imgabs0 #. The cycloolefin copolymer prepared by the invention has a refractive index of 1.63-1.70 and an Abbe number of 14-23, the light transmittance of the material exceeds 90%, and low hygroscopicity is maintained at the same time. The glass transition temperature of the material is 161-185 DEG C, the 5% thermal weight loss is 415 DEG C or above, and the material shows excellent thermal stability. In addition, a commercial catalyst is adopted, the monomer conversion rate can reach 99% or above, and side reactions such as cross-linking do not exist. The excellent performance shows that the material has a wide application prospect in the optical field.

The invention relates to a large-view-field continuous zooming optical system from visible light to a near-infrared band. The system is sequentially provided with a front fixing group with positive focal power, a zooming group with negative focal power, a compensation group with positive focal power, a rear fixing group with negative focal power and an image plane I in the light propagation direction; wherein the zoom group is composed of a meniscus lens with negative focal power and a doublet lens; and the compensation group consists of a meniscus lens with positive focal power, a meniscus lens with negative focal power and a doublet lens with positive focal power. According to the invention, two groups of doublet lenses in different forms are adopted, a negative lens in one group of doublet lenses is crown glass with low refractive index and high Abbe number, and a positive lens in one group of doublet lenses is flint glass with high refractive index and low Abbe number; and in the other group of glued lenses, the negative lens is flint glass with high refractive index and low Abbe number, the positive lens is crown glass with low refractive index and high Abbe number, and the two types of glued lenses effectively control high-order spherical aberration caused by a large view field, correct field curvature and suppress chromatic aberration caused by a wide spectral range.

The invention relates to the field of optical lenses, in particular to an optical lens, a camera module and electronic equipment. Wherein the optical lens comprises a first lens group, a second lens group and a third lens group which are sequentially arranged from an object side to an image side, and the effective aperture DSn of at least one lens in the second lens group and the entrance pupil diameter EPD of the optical lens meet the condition that 2.5 > DSn / EPDgt; 1.1, the first lens, close to the object side, in the first lens group has negative focal power, and the Abbe number Vd1 of the first lens satisfies Vd1gt; 40). On the basis of the scheme, aberration can be greatly reduced, and the imaging quality can be improved.

The embodiment of the invention provides an optical module and optical display equipment. Wherein the optical module comprises a lens group, a light splitting element, a phase retarder and a polarization reflection element which are arranged along the same optical axis, and the phase retarder is located between the light splitting element and the polarization reflection element; the lens group at least comprises two lenses; the lens group is provided with at least one lens with negative focal power, and the lens with the negative focal power meets the condition that (T1 / T2) * (v-50) / n is more than or equal to 3 and less than or equal to 17; wherein T1 is the thinnest thickness of the lens with the negative focal power in the optical effective diameter, T2 is the maximum thickness of the lens with the negative focal power in the optical effective diameter, and n and v are the refractive index and the Abbe number of the lens with the negative focal power respectively.

Provided is a glass composition having a low transition temperature. The glass composition comprises the following components in percentage by weight: 52-64% of SiO2; 9 to 20 percent of Al2O3; 13 to 24% of Na2O; k2O: greater than 0 but less than or equal to 8%; 0.5 to 9 percent of Li2O; mgO: greater than 0 but less than or equal to 7%. Through reasonable component design, the glass composition obtained by the invention has expected refractive index and Abbe number, and also has relatively low transition temperature.

An achromatic imaging optic (20) is used to image an output field (16a) along a beam path (23) of the imaging optic (20) into a target field (14) for use in DUV microlithography. The imaging optic (20) has a plurality of lenses (L1 to L13), each containing less than 5% lead oxide. At least one of the lenses (L5, L7, L9) is made of a high-dispersion optical material with an Abbe number less than 50. At least one of the lenses (L1 to L4, L6, L8, L10 to L13) is made of a low-dispersion optical material with an Abbe number greater than 50. This results in an imaging optic with simplified manufacturing. Depending on the design, the imaging optics can be part of an optical system of a projection exposure system as an illumination lens (20) or as a projection lens.

The present application relates to the field of optical lenses, in particular to an optical lens, a camera module and an electronic device. The optical lens comprises a first lens group, a second lens group and a third lens group, which are sequentially arranged from an object side to an image side, wherein the effective aperture diameter DSn of at least one lens present in the second lens group and the entrance pupil diameter (EPD) of the optical lens satisfy 2.5>DSn / EPD>1.1, a first lens close to the object side in the first lens group has a negative focal power, and the Abbe number Vd1 of the first lens satisfies Vd1>40. On the basis of this solution, aberration can be greatly reduced, thus facilitating the improvement of imaging quality.

An optical imaging system includes a first lens group including a first lens, a second lens, and a third lens, and a second lens group including a fourth lens, a fifth lens, and a sixth lens and configured to be movable in an optical axis direction, wherein the first lens group and the second lens group are disposed in order from an object side toward an image plane side, and wherein conditional expression 1.50<(v1−v2) / (v3−v2)<2.50 is satisfied, where v1 is an Abbe number of the first lens, v2 is an Abbe number of the second lens, and v3 is an Abbe number of the third lens.

The present invention can obtain an optical glass having a small partial dispersion ratio ([theta] g, F) and a refractive index (nd) and an Abbe number ([nu] d) within required ranges. The optical glass contains, in mass%, 10.0 to 70.0% of an SiO2 component, 1.0 to 50.0% of an Nb2O5 component, and 1.0 to 30.0% of an Na2O component, and has a refractive index (nd) of 1.62 to 1.75 (inclusive), an Abbe number ([nu] d) of 30 to 42 (inclusive), and a partial dispersion ratio ([theta] g, F) of 0.594 or less.

The invention relates to the field of optical lenses, and discloses a camera shooting optical lens which comprises a first lens with positive refraction power, a second lens with negative refraction power, a third lens with negative refraction power and a triangular prism with negative refraction power which are sequentially arranged from the object side to the image side. Wherein the axial distance from the object side surface of the first lens to the image side surface of the third lens is D, the optical total length of the camera shooting optical lens is TTL, the Abbe number of a glass lens of the camera shooting optical lens is vdi, the focal length of the camera shooting optical lens is f, the focal length of the first lens is f1, the axial thickness of the second lens is d3, and the axial thickness of the third lens is d5; the axial distance from the image side surface of the second lens to the object side surface of the third lens is d4, the combined focal length of the second lens and the third lens is f23, the curvature radius of the object side surface of the third lens is R5, the curvature radius of the image side surface of the third lens is R6, and the following relational expression is satisfied: 0.14 < = D / TTL < = 0.46; 40.00 < = vdi < = 82.00; 0.30 < = f1 / f < = 0.70; -32.08 < = f23 / (D3 + D4 + D5) < =-3.00; 1.40 < = (R5 + R6) / (R5-R6) < = 20.00.

The invention discloses a wide-angle astronomical eyepiece, which comprises a diaphragm, a first lens group and a second lens group, and is characterized in that the first lens group sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from an object side to an image side; the second lens group sequentially comprises a seventh lens, an eighth lens, a ninth lens and a tenth lens from the object side to the image side; the first lens and the second lens, the fourth lens and the fifth lens, and the eighth lens and the ninth lens are respectively glued; the focal power of the first lens group is phi F, the focal length of the first lens is F1, the refractive index of the first lens is N1, the Abbe number of the first lens is V1, the focal length of the sixth lens is F6, and the following relational expressions are met: 0.42 lt; f1 / [phi] Flt; 0.65, 0.65; 1.70 lt, 1.70 lt; n1lt; 1.85, 1.85; 35 lt; v1lt; 65; 0.028 [mu] m; f < 6 > / [phi] F < lt >; and-0.021,-0.021. The wide-angle astronomical eyepiece can better control chromatic aberration, so that the chromatic dispersion phenomenon is reduced.

An achromatic imaging optic (20) serves to image an output field (16a) along a beam path (23) of the imaging optic into a target field (14) for use in DUV microlithography. The imaging optic (20) has a plurality of lenses (L1 to L10), each of which contains less than 5% lead oxide. At least one of the lenses (L4, L7) is made of a high-dispersion optical material with an Abbe number less than 55. At least one of the lenses (L1 to L3, L5, L6, L8 to L10) is made of a low-dispersion optical material with an Abbe number greater than 55. This results in an imaging optic whose fabrication is simplified.

The invention relates to the technical field of novel high-end polyolefin, in particular to a cycloolefin copolymer and a preparation method thereof. The cycloolefin copolymer has a structure as shown in a formula I: # imgabs0 #. The refractive index of the cycloolefin copolymer can be up to 1.72, and the light transmittance exceeds 90%. By adjusting the variety and proportion of cycloolefin monomers in the copolymer, the cycloolefin copolymer with the refractive index range of 1.64-1.72 and the Abbe number of 12-20 can be obtained. The glass transition temperature of the cycloolefin copolymer ranges from 170 DEG C to 201 DEG C, and 5% thermal decomposition can occur only at the temperature of 420 DEG C or above, so that the cycloolefin copolymer has high heat resistance. In addition, the water absorption rate of the cycloolefin copolymer is less than 0.01%, and the cycloolefin copolymer shows excellent low hygroscopicity. By virtue of ultrahigh refractive index, excellent transparency, high heat resistance and low hygroscopicity, the cycloolefin copolymer shows extraordinary application potential in the high-end optical field.

The application provides an optical glass and a preparation method thereof. The optical glass contains the following components in terms of mole percentage: SiO2: 13-25%; B2O3: 8-17%; Al2O3: 0-6%; BN: 0.1-8%; La2O3: 20-30%; Y2O3: 0-5%; Nb2O5: 2-8%; TiO2: 20-30%; ZrO2: 3-9%; ZnO: 0-5%; the refractive index of the optical glass is 1.99-2.05, and the Abbe number is 26-32. The optical glass has low cost, and is further beneficial to reducing the cost of an optical system. The optical glass has excellent performance, and is beneficial to improving the transmittance of the optical system in the violet light band.

The optical imaging system comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens are sequentially arranged from the object side of the optical imaging system to the imaging surface of the optical imaging system, and a third lens having a negative refractive power, an Abbe number of the third lens being smaller than an Abbe number of the first lens and smaller than an Abbe number of the second lens, and satisfying TTL / (2 * IMG HT) lt; wherein TTL is the distance from the object-side surface of the first lens to the imaging surface, and IMG HT is half the diagonal length of the imaging surface.

The present invention relates to the field of optical imaging technology, and discloses a microscope phase contrast objective lens, comprising a first lens group with positive refractive power, a second lens group with positive refractive power, an object plane and a cover glass, wherein the first lens group is located below the second lens group, and the absolute value of the refractive power of the first lens group is greater than the absolute value of the refractive power of the second lens group. The present invention is arranged by setting the first lens group and the second lens group in the phase contrast objective optical system, and by limiting the focal length, refractive index, Abbe number and thickness of the first lens group and the second lens group, so that the field curvature, distortion and aberration sensitivity of the phase contrast objective optical system are further improved, thereby ensuring the optical performance of the phase contrast objective optical system, so that the objective optical system has the characteristics of small magnification, large numerical aperture, high resolution performance, small chromatic aberration under a large field of view, small number of lenses, and short total length of the objective optical system.

The invention provides an optical imaging lens. The optical imaging lens comprises a lens barrel and a lens group and a spacing element group which are arranged in the lens barrel, the lens group comprises a first lens to a sixth lens, the spacing element group at least comprises a first spacing element, and the first spacing element is located between the first lens and a second lens and makes contact with the image side face part of the first lens; the effective focal length f of the optical imaging lens and the half HFOV of the maximum field angle of the optical imaging lens meet the condition that f * tan (HFOV) is greater than or equal to 9.14 mm and less than 13.05 mm; the inner diameter d1s of the object side surface of the first spacing element, the curvature radius R1 of the object side surface of the first lens, and the Abbe number V1 of the first lens satisfy the following condition: 13.65 < = d1s / R1 * V1 < = 15.25. The problem that in the prior art, stray light is serious in order to meet the requirement of a large view field through an optical imaging lens is solved.

This invention provides an optical glass, its preparation method, and an optical element. The optical glass contains the following components in molar percentage: B₂O₃: 5.0%–19.9%; SiO₂: 5.0%–28.0%; La₂O₃: 0.05%–11.5%; Gd₂O₃: 0%–10.0%; Y₂O₃: 3.6%–15.0%; ZnO: 22.5%–60.0%; the refractive index n of the optical glass is... d An Abbe number of υ is above 1.78. d The temperature coefficient of refractive index is 35-45. The optical glass of this invention has a large positive temperature coefficient of refractive index. When used in combination with optical glass having a negative temperature coefficient of refractive index, it can effectively correct temperature drift caused by rapid temperature changes or high-temperature environments, fix the focus, and maintain clear imaging. It is suitable for vehicle-mounted cameras or projectors, copiers, laser printers, and playback devices that generate a lot of heat during use.

An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, and an eleventh lens sequentially arranged in order along an optical axis from an object side of the optical imaging system toward an imaging surface of the optical imaging system, wherein the first lens has a positive refractive power, the second lens has a negative refractive power, at least two lenses sequentially arranged along the optical axis among the first lens to the fourth lens have an Abbe number of less than 38, and TTL / (2×IMG HT)<0.660 is satisfied, where TTL is a distance along the optical axis from an object-side surface of the first lens to the imaging surface, and IMG HT is one half of a diagonal length of the imaging surface.

The present application provides an optical glass, which contains, in terms of weight percentage, SiO2: 1-15%; B2O3: 2-18%; La2O3: 35-65%; Y2O3: 5-25%; ZrO2: 2-15%; Nb2O5: 1-15%; TiO2: 5-20%, and the refractive index n d of the optical glass is 1.96 or more. Through reasonable component design, the optical glass obtained by the present application has a desired refractive index and Abbe number, and has a lower density, meeting the lightweight use of optical instruments.

The disclosure provides an optical imaging lens assembly, which sequentially includes, from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens with refractive power respectively. Each of the fourth lens, the fifth lens and the sixth lens has negative refractive power. A total effective focal length f of the optical imaging lens assembly satisfies f>7.5 mm. A curvature radius R11 of an object-side surface of the sixth lens, a curvature radius R12 of an image-side surface of the sixth lens, a refractive index N6 of the sixth lens and an abbe number V6 of the sixth lens satisfy 1.0 mm−1<V6 / (R11+R12×N6)<2.0 mm−1.

The invention provides optical glass and an optical element which have expected abbe number vd and refractive index nd and are suitable for color difference correction. The optical glass is characterized in that vd is more than 25.20 and less than or equal to 29.00, nd is more than or equal to 1.80000 and less than or equal to 1.85000, in terms of mass%, SiO2 is 20-30%, Nb2O5 is 35-55%, the mass ratio of SiO2 to Nb2O5 is 0.47-0.66, the total of SiO2 and Nb2O5 is 60-75%, [B2O3 / SiO2] is 0.00-0.07, Li2O is less than or equal to 6.20%, K2O is more than or equal to 0.62%, the total of Li2O, Na2O and K2O is 13.00-15.69%, the mass ratios of Li2O, Na2O and K2O are 0.34-0.41, 0.33-0.5, 0.04-0.30 and 4.00-5.02, respectively,

To provide an imaging lens system having sufficient brightness for a sensing function in bad weather such as night, rain, or fog, with a high resolution, a camera module, an on-vehicle system, and a moving body.SOLUTION: An imaging lens system 11 comprises a front group Gf, an aperture diaphragm STOP, and a rear group Gr, and comprises: a first lens L1 that has negative power and has an image-side surface having a concave surface facing an image side; a second lens L2 that has an object-side surface having a concave surface facing an object side; a third lens L3 that has positive power and has an image-side surface having a convex surface facing the image side; a fourth lens L4 and a fifth lens L5 one of which has negative power and the other of which has positive power and constitute a cemented lens; and a sixth lens L6 that has positive power. When a refractive index of the first lens L1 is defined as nd1, focal lengths of the second lens L2 and the entire optical system are defined as f2 and f, and the Abbe number of the third lens L3 is defined as νd3, the following conditional expressions are satisfied: nd1>1.7...(1), |f2 / f|>8...(2), νd3<55...(3).SELECTED DRAWING: Figure 2

The present invention discloses a high refractive index polycarbonate resin, its preparation method and application. The polycarbonate resin is formed by the reaction of a diol monomer with an ester bond, a fluorene-based or naphthalene-based monomer and a carbonic acid diester compound; preferably, an optical lens with a refractive index of 1.60 - 1.70 and an Abbe number less than 25 at 23 °C and 589 nm can be obtained by injection molding. Its optical transmittance is ≥ 85% in the wavelength range of 450 nm - 1100 nm, and the b value of a 1 mm sample plate injection-molded from the polycarbonate resin is less than 3, having industrialization prospects.