367 results about "Abbe number" patented technology

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 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.

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.

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.

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 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.

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 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,

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.

The present application provides an optical lens system, comprising: five lenses, the five lenses comprising a first lens to a fifth lens in sequence from an object side to an image side; a plurality of spacers, the plurality of spacers comprising a fourth spacer located on the image side of the fourth lens and in contact with the image side surface of the fourth lens; a lens barrel for accommodating the lenses and the spacers; the Abbe number V4 of the fourth lens and the Abbe number V5 of the fifth lens satisfy: -40 < V4-V5 < -30; the effective focal length f4 of the fourth lens, the effective focal length f5 of the fifth lens, the inner diameter d4s of the object side surface of the fourth spacer, the outer diameter D4m of the image side surface of the fourth spacer satisfy: -1 < (d4s*D4m) / (f4-f5) < 3; the curvature radius R7 of the object side surface of the fourth lens, the curvature radius R8 of the image side surface of the fourth lens, the thickness CP4 of the fourth spacer, the air gap T45 of the fourth lens and the fifth lens on the optical axis, the central thickness CT5 of the fifth lens satisfy: -40 < (R7+R8) / (CP4+T45+CT5) < -18. The present application solves the problem that the rear-end system of the optical lens system in the prior art is prone to stray light.

Embodiments of the present application provide an optical imaging system and a head-mounted display device. The system comprises a first lens group, a first polarization device, a second lens group, and a second polarization device arranged in sequence. The second lens group has at least one reflection surface protruding towards the first polarization device, and comprises a first lens and a second lens. The first lens has a positive refractive power in a vicinity of an optical axis, and the second lens has a negative refractive power in a vicinity of the optical axis. The refractive index of the first lens is smaller than that of the second lens, and the Abbe number of the first lens is greater than that of the second lens. The system further comprises a first quarter-wave plate between the reflection surface of the second lens group and the first polarization device, and a second quarter-wave plate between the reflection surface of the second lens group and the second polarization device. The optical imaging system has high resolving power, thereby improving the resolution of the head-mounted display device and solving the problem of blurred imaging in vision of the head-mounted display device.

According to certain embodiments disclosed herein, a lens assembly and / or an electronic device including the same may include an image sensor, and first to ninth lenses sequentially arranged along an optical axis. The first lens may include a convex object side surface while having positive refractive power, the second lens may include a concave image sensor side surface while having negative refractive power, the third lens may have positive refractive power, and the eighth lens may have has negative refractive power and may include an object side surface and an image sensor side surface, at least one of which is an aspherical surface including at least one inflection point. The lens assembly and / or the electronic device may satisfy Conditional Expression 1: 20≤v3≤40 and Conditional Expression 2: 1.7≤Fno≤2.0. Here, “v3” may be an Abbe number of the third lens, and “Fno” may be an F-number of the lens assembly. Various other embodiments are possible.

To provide a phosphoric acid-based glass having a low heat expansion coefficient.SOLUTION: An optical glass has, on a mass basis, a content of B2O3 of 3.00% or more and 70.00% or less, a content of P2O5 of 47.00% or more and 80.00% or less, a content of Al2O3 of 13.00% or less, a content of Li2O of 0.01% or more, a content of Na2O of 5.00% or less, a content of CaO of 18.00% or less, a content of ZnO of 23.00% or less, a total content of (P2O5+B2O3+SiO2) of 66.00% or more and 84.00% or less, a total content of (MgO+CaO+SrO+BaO) of 26.00% or less, provided that a total content of (P2O5+B2O3+SiO2) of 69.00% or more and 84.00% or less when a total content of (MgO+CaO+SrO+BaO) is 15.00% or more and 26.00% or less, a total content of (Li2O+Na2O+K2O) of 15.00% or less, a mass ratio of (P2O5 / B2O3) of 18.00 or less, a mass ratio of (Na2O / (Li2O+Na2O+K2O)) of 0.50 or less, a total content of (MgO+CaO) of 2.00% or more, a mass ratio of ((Li2O+BaO) / B2O3) of 0.59 or less, a mass ratio of ((Al2O3+BaO) / Li2O) of 2.77 or less, a mass ratio of ((MgO+CaO) / (Li2O+Na2O+K2O)) of 6.10 or less, a mass ratio of ((MgO+CaO+SrO+BaO+ZnO) / (P2O5+B2O3+SiO2)) of 0.36 or less, a refractive index nd of 1.70000 or less, an Abbe number νd of 60.00 or more, and an average linear expansion coefficient α at 100°C-300°C of 130×10-7 / K or less.SELECTED DRAWING: None

The embodiment of the utility model provides an optical system and augmented reality equipment, the optical system comprises a display unit, a first lens, a second lens and a third lens in sequence along the light transmission direction, two of the first lens, the second lens and the third lens are made of plastic materials, and the other one is made of glass materials. The first lens, the second lens and the third lens are aspheric lenses, the first lens and the third lens have positive focal power, the second lens has negative focal power, the refractive index of the first lens, the refractive index of the second lens and the refractive index of the third lens are 1.4-2.0, the Abbe number of the first lens and the Abbe number of the second lens are 20-40, and the Abbe number of the third lens is 50-80. According to the embodiment, the requirements for imaging quality and size reduction can be met by using the three aspheric lenses, the light weight of the augmented reality equipment is effectively realized, and the user experience is improved.

A rear converter lens disposed on an image side of a main lens, including a first positive lens, a second positive lens, and a first negative lens, in which anomalous dispersion properties with respect to the C-line and the t-line of materials forming the first positive lens, the second positive lens, and the first negative lens and a ratio of a combined focal length of the main lens and the rear converter lens to a focal length of the main lens are appropriately set where the anomalous dispersion property is defined by a partial dispersion ratio with respect to the C-line and the t-line and an Abbe number with respect to the d-line.

An imaging lens system is provided. The imaging lens system includes a first lens having refractive power, a second lens having refractive power, a third lens having a concave object-side surface, a fourth lens having refractive power, a fifth lens having refractive power, a sixth lens having a concave object-side surface, and a seventh lens having refractive power. The first to seventh lenses may be sequentially disposed from an object side to an imaging side. In the imaging lens system, 20<V1−V3 and 190°≤FOV, where V1 is an Abbe number of the first lens, V3 is an Abbe number of the third lens, and FOV is a field of view of the imaging lens system.

A fixed-focal-length optical system consists of, in order from an object side to an image side, a front group, a stop, and a rear group. In a case where a refractive index and an Abbe number of a lens included in the fixed-focal-length optical system are denoted by Nd and νd, respectively, the fixed-focal-length optical system includes at least one specific lens that is a lens satisfying 2.435<Nd+0.01425×νd<2.75 and 15<νd<39.

The invention discloses a large-view-field low-distortion infrared telecentric scanning objective lens which comprises a lens body, the lens body is composed of a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are arranged along an axis, the first lens is a positive lens, the second lens is a negative lens, the third lens is a negative lens, the fourth lens is a meniscus positive lens, and the fifth lens is a negative lens. The fifth lens is a positive lens, and the first lens and the second lens are cemented lenses. According to the invention, through combination of a plurality of lenses and the balsaming lens, high optical index, good temperature adaptability, low distortion, large target surface and large entrance pupil diameter are realized; by reasonably distributing the focal power of each lens and adopting the combination of optical materials with specific refractive index and Abbe number, various aberrations such as spherical aberration, curvature of field, chromatic aberration and the like are effectively corrected, so that high-quality imaging with system RMS wavefront less than 0.02 lambda is realized, the distortion is strictly controlled below 0.02%, and the imaging quality is greatly improved. And a sub-pixel-level accurate positioning capability is realized for high-precision machine vision and measurement detection.

This provides an optical system that is even smaller than conventional ones. [Solution] The optical system includes an optical element having a diffraction plane MOE with controlled wavelength dispersion characteristics and a lens LN. The Abbe number ν0 of the diffraction plane satisfies the condition -0.2 < 1 / ν0 < 0.2. The diffraction plane has a rotationally asymmetric optical path difference function.

The optical image capturing 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, in which the first lens group and the second lens group are disposed in order from an object side toward an image surface, and in which conditional expressions are satisfied: 1.50 lt; (v1-v2) / (v3-v2) lt; v1 is the Abbe number of the first lens, v2 is the Abbe number of the second lens, and v3 is the Abbe number of the third lens.

This invention relates to the field of optical lenses and discloses a camera optical lens comprising seven lenses, which are arranged sequentially from the object side to the image side as follows: a first lens with positive refractive power, a second lens with negative refractive power, a third lens, a fourth lens with negative refractive power, a fifth lens, a sixth lens with positive refractive power, and a seventh lens with negative refractive power; the focal length of the camera optical lens is f, the focal length of the sixth lens is f6, the focal length of the seventh lens is f7, the central radius of curvature of the object side of the seventh lens is R13, the central radius of curvature of the image side of the seventh lens is R14, and the Abbe number of the first lens L1 is v1, satisfying the following relationships: 1.40≤(f6-f7) / f≤1.70; 2.00≤R14 / R13≤6.00; 60.00≤v1≤82.00.

The optical image capturing system includes, in order from an object side, a first lens having refractive power, a second lens having positive refractive power, a third lens having negative refractive power, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. The first lens and the second lens are bonded together, wherein 0 < = f1 / v1-f2 / v2lt is satisfied; f1 is the focal length of the first lens, v1 is the Abbe number of the first lens, f2 is the focal length of the second lens, and v2 is the Abbe number of the second lens.

To reduce axial chromatic aberration, to secure high resolution, and to satisfactorily reduce spherical aberration and coma aberration.SOLUTION: An aperture diaphragm STO is arranged between a first lens group G1 and a second lens group G2, and the first lens group G1 is provided with a cemented lens L15 obtained by cementing a first positive lens L16 and a first negative lens J1 and having negative power. The cemented lens J1 is configured to satisfy "ndp> 1.85" (conditional formula 1), "Δ θ gF> 0.02" (conditional formula 2), "ndp> ndn" (conditional formula 3), and "ν dp <ν dn" (conditional formula 4), where ndp is an index of refraction of the first positive lens L15, ndn is an index of refraction of the first negative lens L16, Δ θ gF is anomalous dispersion, ν dp is an Abbe number of the first positive lens L15, and ν dn is an Abbe number of the first negative lens L16.SELECTED DRAWING: Figure 1

Embodiments of the present application provide a zoom lens, a camera module and an electronic device. The zoom lens comprises: first, second and third lens groups arranged in order from the object side to the image side along the optical axis; the first and third lens groups have negative optical power, and the second lens group has positive optical power; the first lens group is a fixed group, the second lens group is a zoom group capable of moving along the optical axis, and moves from the first end close to the object side to the second end close to the image side, thereby realizing optical zoom of the zoom lens from the telephoto end to the wide-angle end; and the third lens group is a compensation group capable of moving along the optical axis; in the first, second and third lens groups: the total number of lenses with optical power is M, the number of aspheric surfaces is N, M≤7, and N≥8; the second lens group comprises at least two lenses, at least one of the two lenses has negative optical power, and the Abbe number V thereof is ≤40. The zoom lens of the embodiments of the present application has the advantages of simple structure, miniaturization and thinness, and can realize continuous zooming.