150 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.

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.

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.

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.

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。

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.

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.

To provide an optical system that is compact yet possesses high optical performance. [Solution] The optical system (1a) consists of a first unit (L1), a second unit (L2), and a third unit (L3) arranged in order from the object side to the image side. The first unit has a first substrate (11) and a first lens (12), the second unit has a second substrate (21) and a second lens (22), and the third unit has a third substrate (31) and a third lens (32). At least one of the first lens, the second lens, or the third lens is joined with a fourth lens (4R) to form a bonded lens (4sm), and the power and Abbe number of the fourth lens and the lens (4B) joined to the fourth lens are different from each other.

The utility model discloses a projection lens with a large image plane and a long focus. The projection lens comprises a first lens, a second lens, a third lens, a fourth lens and a diaphragm, wherein the entrance surfaces of the first lens, the second lens, the third lens and the fourth lens are respectively provided with a first anti-reflection coating film, and the exit surfaces of the first lens, the second lens, the third lens and the fourth lens are respectively provided with a second anti-reflection coating film; thus, by arranging multiple layers of anti-reflection coating films on the entrance surfaces and the exit surfaces of the first lens, the second lens, the third lens and the fourth lens and adopting the design of alternately overlapping the front anti-reflection coating films and the rear anti-reflection coating films, the refractive indexes and the Abbe numbers of different lenses are optimized, the reflection loss of light on the surfaces of the lenses is remarkably reduced, and the light transmittance is improved. The light transmittance and the imaging quality of the system are improved; and the material of the first front anti-reflection coating film of the entrance surface has high hardness and wear resistance, so that the influence of dust, fingerprints and mechanical friction can be effectively resisted, and the service life of the lens is prolonged.

A zoom lens includes, in order from an object side to an image side, a first lens unit with positive refractive power which does not move in zooming, and a plurality of lens units which moves in zooming. Each of intervals between the respective adjacent lens units varies in zooming. The plurality of lens units includes a variable magnification unit consisting of one or a plurality of lens units which monotonously moves toward the image side in zooming from a wide-angle end to a telephoto end. The variable magnification unit includes at least one positive lens and at least one negative lens and has negative refractive power at the wide-angle end. The zoom lens satisfies a specific inequality regarding average values of partial dispersion ratios in the variable magnification unit. The variable magnification unit includes a positive lens satisfying specific inequalities regarding an Abbe number and a partial dispersion ratio.

A lens device comprises, in order from the object side to the image side, a first lens unit with a positive refractive power; a second lens unit with a positive refractive power, which moves to focus;and a third lens unit, wherein a distance between adjacent lens units is changed during focusing, the first lens unit comprising two successively arranged positive meniscus lenses, each with a convex surface on the object side, in the order from the object side to the image side, the first lens unit comprising a first negative lens in which the refractive index, the Abbe number of the first negative lens for the d-line, a partial dispersion ratio of the first negative lens with respect to the g-line, a distance on an optical axis from a lens surface nearest to the image side to an image plane, and a focal length of the lens device at infinity are properly set.

The present application relates to a thermally cured lens composition, a thermally cured lens and a manufacturing method thereof. The thermally cured lens is manufactured by using a thermally cured lens composition containing a plurality of (meth)acrylate monomers in a specific ratio and a thermal initiator, and then performing a thermal curing step. In this way, the thermally cured lens is not only suitable for the specification of a thermally cured acrylic lens of 1.50, but also has high manufacturing process stability, which can reduce production risk and cost. The obtained thermally cured lens has better heat resistance and high Abbe number.

The invention provides optical glass which comprises the following components in percentage by weight: 20-32% of SiO2; 21 to 34 percent of TiO2; 8 to 20 percent of Nb2O5; baO: greater than 10% but less than or equal to 22%; 8.5% to 20% of Na2O; and 0.1 to 9 percent of Bi2O3. Through reasonable component design, the optical glass with the refractive index of 1.81-1.88 and the Abbe number of 20-27 is obtained by adopting a silicate glass system, the raw material cost and the production cost of the optical glass are relatively low, and the requirement of environmental protection is met.

The invention provides a projection objective and exposure equipment. The projection objective comprises a first lens group, a second lens group, an aperture diaphragm, a third lens group and a fourth lens group, the first lens group is configured to match the maximum static exposure field-of-view diameter and the maximum numerical aperture; the second lens group is configured to correct field curvature and distortion, the second lens group has positive focal power, and the second lens group comprises at least two lenses with Abbe numbers greater than or equal to 65; the third lens group is configured to compensate chromatic aberration, the third lens group has negative focal power, and the third lens group comprises at least two lenses of which the Abbe number is greater than or equal to 65 and at least one lens of which the Abbe number is less than 50; the fourth lens group is configured to compensate for aberration related to a view field or compensate for second-order field curvature and astigmatism; all the lenses of the first lens group, the second lens group and the fourth lens group are all spherical lenses. According to the invention, the view field size of the exposure system can be effectively increased, the view field is increased, the exposure time is shortened, and a smaller exposure resolution is realized.

An optical imaging 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 in ascending numerical order along an optical axis from an object side of the optical imaging system toward an imaging plane of an image sensor, wherein TTL / (2*IMG HT)≤0.67 is satisfied, where TTL is a distance along the optical axis from an object-side surface of the first lens to the imaging plane of the image sensor, and IMG HT is one half of a diagonal length of the imaging plane of the image sensor, and 15<v1-v3<45 is satisfied, where v1 is an Abbe number of the first lens, and v3 is an Abbe number of the third lens.

The invention provides optical glass, a preparation method thereof and a vehicle-mounted lens. The optical glass comprises the following components in molar percentage: 5.0-13.0% of Si < 4 + >, 5.0-13.0% of Si < 4 + >, and the balance of glass. B < 3 + >: 24.5-45.0%; la < 3 + >: 12.0%-19.99%; 6.0 to 13.0% of Nb < 5 + >; 8.0 to 13.0% of Ti < 4 + >; 2.0 to 6.0 percent of Zr < 4 + >; 10.01%-21.0% of Zn < 2 + >; 0 to 0.2 percent of Sb < 3 + >; the refractive index nd of the optical glass is 1.89 or above, and the Abbe number upsilon d of the optical glass is 28 or above. The optical glass provided by the invention has the advantages of low thermal expansion coefficient, good thermal conductivity, high hardness, high strength and good chemical stability, can be used in various environments, and is especially suitable for vehicle-mounted lenses for intelligent driving.

This invention provides an optical glass with a refractive index and Abbe number satisfying Equation (1) and a low glass transition temperature. In the glass composition expressed as mass % of the optical glass, the contents of B2O3, ZnO, La2O3, Ta2O5, WO3, total content (SiO2+B2O3+P2O5), total content (ZrO2+Ta2O5+Nb2O5+TiO2+WO3), mass ratio (SiO2 / B2O3), mass ratio (Li2O / SiO2), and mass ratio ((La2O3+Gd2O3+Y2O3) / (ZrO2+Ta2O5+Nb2O5+TiO2+WO3)) are all within given ranges, and the refractive index nd and Abbe number νd satisfy Equation (1): νd>-30.466×nd+97.760.

The invention discloses a high-Abbe number optical lens composition of a sulfur-containing resin monomer with a high refractive index, and relates to the technical field of lens compositions, and the high-Abbe number optical lens composition comprises the following raw materials: bis (2-isothiocyano ethyl) thioether, 1, 3, 5-tri (isocyanate methyl) cyclohexane, 4, 8-dimercaptomethyl-1, 11-dimercapto-3, 6, 9-trithioundecane, 1, 4-cyclohexane dimethyl mercaptan, perfluoro-1, 3, 4-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, the invention relates to a high-temperature-resistant flame-retardant plastic which is prepared from the following raw materials: 1, 4-cyclohexanedimethanol, modified tri (beta-epithiopropyl) isocyanurate, modified dicyclopentadiene diepoxy, N-(2-ethoxyl) piperidine, a bismuth-zinc complex catalyst, modified lauryl phosphate diethanolamine salt, dibenzothiophene sulfone and an antioxidant. According to the invention, the modified dicyclopentadiene diepoxy is added, so that the modified dicyclopentadiene diepoxy can be perfectly compatible with a polythionocarbamate matrix, the problem that common dicyclopentadiene diepoxy is easy to agglomerate and separate is avoided, and meanwhile, by introducing a rigid structure, the original hardness of the lens is greatly improved.

A composite optical element includes a glass lens and a resin lens that are joined together. The resin lens has an aspheric shape. When Nd is a refractive index of the resin lens, νd is an Abbe number of the resin lens, and θgF is a partial dispersion ratio of the resin lens, Nd, νd, and θgF are appropriately set.