270 results about "Abbe number" patented technology

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.

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 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 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.

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.

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.

To provide a compact zoom lens with high optical performance. [Solution] A zoom lens comprising a plurality of lens groups arranged sequentially from the object side to the image side, wherein the distance between adjacent lens groups changes when the zoom is changed, the first lens group located furthest towards the object among the plurality of lens groups is immovable with respect to the image plane when the zoom is changed, each of the plurality of lens groups has one or more aspherical lenses made of resin material, the first lens group located furthest towards the object among the plurality of lens groups has a positive lens Gp, and when the Abbe number of the material of the positive lens Gp is ​​νdp, the partial dispersion ratio is θgFp, and the anomalous partial dispersion is ΔθgFp, a predetermined conditional equation is satisfied.

This application discloses an optical imaging system, comprising: an imaging lens group consisting of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged sequentially along the optical axis from the object side to the image side; wherein the first lens has positive optical power; the second lens has negative optical power; the third and fourth lenses have different signs of optical power; the fifth lens has positive optical power; the sixth lens has negative optical power; at least one of the object side and image side of the sixth lens has an inflection point; and the Abbe number of both the second and fourth lenses is less than 25; a plurality of spacer elements including a third spacer element and a fourth spacer element; and a lens barrel; wherein the radius of curvature R9 of the object side of the fifth lens, the spacing EP34 of the image side and object side of the third spacer element along the optical axis, and the maximum thickness CP4 of the fourth spacer element along the optical axis satisfy: 11 <R9 / (EP34+CP4)<33。

To reduce a weight of a display optical system.SOLUTION: A display optical system 1000 introduces display light from a display surface of a display element 1400 to a pupil surface SP. The display optical system includes, sequentially arranged from a pupil surface side to a display surface side, a first optical system 1100, a first transmission reflection surface A, a second optical system 1200, a second transmission reflection surface C, and a third optical system 1300. The second optical system includes: a lens having a positive power on axis; and a lens having a negative power on axis and different in an Abbe number based on a d-line from the lens having the positive power on axis. At least one of the first optical system and the third optical system has a curved surface being a boundary face between an atmosphere and the one. An Abbe number based on the d-line of the lens having the positive power on axis is larger than an Abbe number based on a d-line of the lens having the negative power on axis.SELECTED DRAWING: Figure 1

The invention belongs to the field of medical optical instruments for ophthalmology, and particularly discloses an chamber angle imaging optical system for glaucoma surgery and internal focusing observation device.The chamber angle imaging optical system for glaucoma surgery comprises a first lens, a second lens, a third lens, a fourth lens and an observation mirror which are sequentially designed; the observation mirror is arranged on an eyeball cornea; the Abbe number of the first lens is larger than 80, and the ratio of the Abbe number of the first lens to the Abbe number of the second lens is larger than or equal to 2. The third lens is a positive lens, the fourth lens is a negative lens, the third lens is arranged in a sliding mode in the axial direction, the diopter of the third lens ranges from 5.1 D to 5.5 D, the diopter of the fourth lens ranges from-5.8 D to-6.2 D, and the ratio of the absolute value of the diopter of the fourth lens to the absolute value of the diopter of the third lens ranges from 1.0 to 1.2. By the adoption of the scheme, the problems that a doctor needs to hold an observation mirror by hand, an operation can only be operated with one hand basically, and operation is not convenient enough can be solved.

An imaging lens system is provided. The imaging lens system includes: a first lens having a concave object side surface; a second lens having positive refractive power; a third lens having refractive power; a fourth lens having refractive power; a fifth lens having refractive power; a sixth lens having an Abbe number greater than 20 and less than 40; and a seventh lens having refractive power, in which the first to seventh lenses are sequentially arranged from the object side to the imaging side, and the imaging lens system satisfies the following conditional expressions: TTL / (ImgHT * 2) lt; 0.8 DEG and 100 DEG lt; tTL is the distance from the object side surface of the first lens to the imaging surface, ImgHT is the height of the imaging surface, and FOV is the angle of view of the imaging lens system. The invention further provides the electronic equipment.

The present invention provides an optical device that shifts the path of travel of input light and outputs output light along optical paths parallel to and different from the optical path of the input light, the optical device being provided with: a first prism body and a second prism body each having an incident surface and an exit surface that are not parallel to each other; and a displacement amount adjustment mechanism that adjusts the amount of displacement of the light by changing the distance therebetween. The first prism body and the second prism body are respectively provided with a first component and a second component in a state that the end surfaces are butted with each other, one end surface of the first component forms an incidence surface, one end surface of the second component forms an emission surface, and the Abbe number of the second component is different from that of the first component. The present invention can suppress an increase in astigmatism difference, and can also suppress the influence of chromatic aberration caused by wavelength dependence of the refractive index of a prism material.

The application provides 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 arranged in sequence from an object side to an image side. The second lens group is an anti-shake lens group. The second lens group can move in a direction perpendicular to the optical axis of the second lens group to realize optical anti-shake. The product of the combined optical power of the first lens group and the third lens group is less than 0. The second lens group comprises at least a first lens. The optical power of the first lens is f1>0, and the Abbe number is A1, 18<A1<38. During the movement of the second lens group in the direction perpendicular to the optical axis to realize optical anti-shake, the focal length variation of the whole optical lens can approach zero, so that the light can be clearly imaged on the image sensor. The first lens with positive optical power and low Abbe number arranged in the second lens group can make the short-wave light excessively converge. In this way, the excessive divergence of the whole optical lens to the short-wave light can be compensated, and the purple edge phenomenon can be reduced.

Provided is a light guide plate which, when used as a light guide plate of a glasses-type device such as a wearable device for AR / MR, is capable of enhancing color reproducibility of an image. A light guide plate 10 includes a glass plate 1, and a resin layer 2 formed at a main surface of the glass plate 1. The difference in Abbe number νd between the glass plate 1 and the resin layer 2 is less than 10. The refractive indices nd of the glass plate 1 and the resin layer 2 are 1.7 or greater and the difference between the refractive indices nd is 1.0 or less.

Optical photographic system comprising five lens elements (E1, E2, E3, E4, E5), wherein the five lens elements (E1, E2, E3, E4, E5) are arranged in the order from an object side to an image side along a ray path comprising a first lens element (E1), a second lens element (E2), a third lens element (E3), a fourth lens element (E4), and a fifth lens element (E5), and wherein each of the five lens elements (E1, E2, E3, E4, and E5) has an object-side surface facing the object side and an image-side surface facing the image side; wherein the first lens element (E1) has a positive refractive power, the object-side surface of the second lens element (E2) is concave in a paraxial region thereof, the fifth lens element (E5) has a negative refractive power and the image-side surface of the fifth lens element (E5) is concave in a paraxial region thereof; where an Abbe number of the second lens element (E2) is V2, an Abbe number of the third lens element (E3) is V3, an Abbe number of the fourth lens element (E4) is V4, and a central thickness of the fifth lens element (E5) is CT5, an axial distance between the third lens element (E3) and the fourth lens element (E4) is T34, a focal length of the optical recording system is f, a focal length of the second lens element (E2) is f2, a focal length of the third lens element (E3) is f3, a focal length of the fourth lens element (E4) is f4, and the following conditions are met: 40.0 < V 2 + V 3 + V 4 < 80.0 ; 0.00 < CT 5 / T 34 < 1.00 ; and 0.00 < | f / f2 | + | f / f3 | + | f / f4 | < 1.00.