17results about How to "Small optical distortion" patented technology

The utility model discloses a 3D printing lens and a projection device, comprising a front group lens group, a diaphragm and a rear group lens group which are sequentially arranged in a direction from an object plane to an image plane, and the focal length of the lens is 10mlt; flt; the focal length of the front lens group is-100mm, and the focal length of the rear lens group is-100mm; f front lt; the focal length of the rear lens group is-50mm, and the focal length of the rear lens group is 15mlt; f rear lt; 25 mm; the lens is highly matched with a 0.47-inch DMD chip, the offset rate of the lens can reach 0%, optical distortion is small, imaging is good, and the projection ratio of the lens is larger than 0.5 and smaller than 1.35; the device has a large defocus range and can adapt to an unstable lighting environment; the imaging picture brightness is uniform, the edge loss light energy is less, and the illumination light utilization rate is high.

The invention discloses a near-infrared optical imaging lens, which is characterized by comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a fifth lens and a sixth lens which are sequentially arranged on an optical path from an object side to an image side, the second lens is a meniscus lens with positive focal power; the third lens is a biconcave lens with negative focal power; a diaphragm; the fourth lens is a biconvex lens with positive focal power; the fifth lens is a biconvex lens with positive focal power; the sixth lens is a biconvex lens with positive focal power; the seventh lens is a biconcave lens with negative focal power; the working wave band of the near-infrared optical imaging lens ranges from 900 nm to 1700 nm, and the focal length of the near-infrared optical imaging lens is 45 mm. According to the invention, by designing each lens, a large rear working distance is obtained while transverse aberrations are offset, and the imaging quality is further improved.

The present invention discloses a cell in-situ temperature-controlled chip culture system adapted for microscopic optical imaging, and relates to the technical field of in-situ observation of microscopic live imaging. The key points of the technical solution are: comprising a temperature-controlled chip and an accessory for cell culture, wherein the temperature-controlled chip is detachably connected to the accessory and is located inside the accessory; the accessory comprises a cell culture device, a connection card, a control circuit, a culture pool with openings at both ends, a connector and a connection interface; the temperature-controlled chip comprises a transparent chip body, a temperature-measuring layer and a heating layer, wherein the temperature-measuring layer and the heating layer are respectively fixedly connected to the opposite side walls of the chip body. The system is a device adapted for an optical microscope observation system, which can monitor and precisely control the temperature of the chip control area in real time, and is applied to various experiments and application scenarios that require precise control of cell culture, microbial incubation, material temperature control, and in-situ observation of cells, and provides powerful tools and support for in-depth research in the fields of life sciences and materials science.

The invention relates to a small telephoto lens for portable code scanning equipment and a working method of the small telephoto lens. The small telephoto lens is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged in the light incidence direction, and a diaphragm is arranged between the third lens and the fourth lens. The second lens and the third lens are glued to form a balsaming lens group A, and the fourth lens and the fifth lens are glued to form a balsaming lens group B. According to the invention, the design of six glass spherical lenses is adopted, and the parameters and the on-axis distance of each lens are optimized, so that the optical performance of high resolution and long focal length can be satisfied, and meanwhile, the optical system has the advantages of low distortion and high illumination; and the total length of the lens is smaller, so that the miniaturization requirement of portable code scanning equipment is met.

The application provides an eye parameter measuring instrument, comprising a wavefront pre-compensation device, a wavefront aberration measuring device and a corneal topography measuring device; the wavefront pre-compensation device comprises a compensation light source, a collimating lens and a first 4f system; the wavefront aberration measuring device comprises a second 4f system, a first light splitting element and a wavefront aberration instrument; the corneal topography measuring device comprises a Placido disc structure, a third 4f system, a second light splitting element and an image acquisition element; the Placido disc structure faces the eye of a measured person; the light paths of the first 4f system and the third 4f system intersect at the second light splitting element; and the light paths of the second 4f system and the third 4f system intersect at the first light splitting element. The wavefront aberration measuring device and the corneal topography measuring device are arranged, so that the wavefront aberration and the corneal topography of the eye can be measured simultaneously in one inspection, the inspection times of the measured person are reduced, and accidental errors caused by multiple inspections are avoided.

The invention discloses a high-pixel and large-surface industrial lens, comprising an optical system, wherein a focusing group with positive focal length and a fixed group with negative focal length are sequentially arranged from the object side to the image side of the optical system, the focusing group comprises a front group with positive focal length, a middle group with positive focal length, an aperture, and a rear group with positive focal length. The focal length of the optical system is f, and the focal length of the focusing group is f S1 , the focal length of the fixed group is f S2 , satisfying the relationship: 0.85<|f S1 / f|<1.20, 36.00<|f S2 / f|<38.00. The above structure achieves low distortion with a focal length of 60mm, an image-side F number of 5.0, a maximum resolution of 140lp / mm, and can match a 3.57μm pixel chip. The maximum imaging surface is φ67mm, and its pixels can reach 150 million pixels. The maximum optical distortion of the full field of view is less than 0.34%; the floating focus method is adopted, and the aperture can also be flexibly adjusted.

The utility model relates to the technical field of gun aiming lenses, and discloses a day and night dual-purpose gun aiming lens, which comprises a lens barrel, and a first convex-concave lens, a first doublet lens, a second doublet lens, a first biconvex lens and a second convex-concave lens are sequentially fixed in the lens barrel along the direction from an object plane to an image plane; in actual use, for the gun sight lens provided by the utility model, the sighting distance of the arranged lens structure can be from 300mm to infinity, the size of an image space target surface is 3.4 mm, the visual field range of an object space is 6 degrees, the F number of a lens aperture is 1.3, the definition of the object space can be 24lp / mm, and the optical distortion is less than 0.2%. Therefore, the long-enough aiming distance and the good definition can enable the sighting telescope to meet the requirements of daily use and night use at the same time.

The invention discloses a surface protection film of a prismatic lens and a preparation method of the surface protection film, and belongs to the technical field of protection films. The special hydrogenated styrene copolymer, the tackifying resin and the monomer resin are compounded, so that the adhesive has good wettability and initial adhesion force on the prismatic lens; metallocene catalyzed polypropylene and a cycloolefin copolymer are added into the core layer to be compounded, interface light reflection loss is effectively reduced, then an antistatic composition composed of a polyether amide copolymer, ethamine oxide and glycerol monostearate is added, and a certain antistatic effect is achieved; a composite light stabilizer is also added, so that a dual-protection system is constructed, and the aging resistance is improved; on the whole, through the structural design of the back unrolling layer, the core layer and the viscous layer and the optimization of the synergistic effect of the preparation raw materials and the formula, the prismatic lens surface protection film which is excellent in initial viscosity, low in unrolling force, slow in viscous force increase, antistatic, aging-resistant, optically matched and excellent in comprehensive performance can be prepared, and the prismatic lens surface protection film has a good industrial application prospect.

The present invention provides an optical lens for projection, which comprises: a concave reflector arranged in sequence from the object side to the image side, a first lens group with negative optical power, a second lens group with positive optical power moving forward and backward along the optical axis of the optical lens for projection, a third lens group with positive optical power and a galvanometer, wherein an aperture is arranged between the lenses of the third lens group; the first lens group comprises a first lens and a second lens arranged in sequence, wherein the first lens faces the concave reflector. The present invention has the advantages of no distortion at large angles and image telecentricity.

The present disclosure provides a method for producing an extruded resin laminated film with small optical distortion and small change in orientation axis of the optical distortion. A laminate including a (meth)acrylic resin-containing layer laminated on at least one side of a polycarbonate-containing layer is coextruded from a T-die in a molten state, cooled using three or more cooling rolls, and the obtained extruded resin laminated film is wound up by a winding roll. The laminate is sandwiched between the first cooling roll and the second cooling roll without generating a bank, and a metal elastic roll is used as the first cooling roll, and a metal rigid roll is used as the second cooling roll. The overall temperature of the laminate when peeled off from the final cooling roll is set to lower than the glass transition temperature of the polycarbonate-containing layer by 40 to 5°C. The peripheral velocity of the second cooling roll is represented as V2, the peripheral velocity of the third cooling roll as V3, and the peripheral velocity of the winding roll as V4. Both V3 / V2 and V4 / V2 are set to 0.980 to 1.000.

The present invention relates to the technical field of shooting equipment, and in particular to a free-form surface periscope telephoto lens. The free-form surface periscope telephoto lens provided in the present application is composed of a first free-form surface prism, a second free-form surface prism, a first lens with negative refractive power, and a second lens with positive refractive power. Through different arrangements, the propagation direction of light can be changed by 60 degrees to 90 degrees, thereby reducing the physical size of the entire optical system, making it more compact and reducing the length of the periscope telephoto lens.

The prime lens disclosed by the invention can be used for a full-frame camera. The prime lens sequentially comprises a first lens group with negative refractive power, an aperture diaphragm, a second lens group with positive refractive power and a third lens group with negative refractive power in the direction of an incident optical axis. The first lens in the direction of the incident optical axis is a positive lens, the object side surface is a non-spherical convex surface, and the image side surface is a spherical convex surface. The last lens in the direction of the incident optical axis is a negative lens, the object side face is a non-spherical concave face, and the image side face is a non-spherical concave face. The first lens and the last lens have the same d-line refractive index, d-line Abbe number and object side aspheric surface expression. In a large light flux interval, the prime lens is high in imaging resolution and low in optical distortion.

The invention discloses a high-definition industrial lens with a large target surface and a wide working distance, comprising a first lens group G1 with a negative optical power and a second lens group G2 with a positive optical power arranged in sequence from the object plane to the image plane. When focusing, the first lens group G1 is fixed relative to the image plane, and the second lens group G2 moves along the optical axis; the high-definition industrial lens with a large target surface and a wide working distance also meets the following conditions: 2.0≤|F1 / F2|≤6.0, ‑0.3≤f / F1≤0.1, wherein F1 is the focal length of the first lens group G1, F2 is the focal length of the second lens group G2, and f is the focal length of the optical system. The application meets the requirements of a large target surface with high pixels, a wide working distance range, good and stable analytical performance, small optical system distortion, and high imaging quality.

This application relates to a display method, apparatus, and computer device. It involves acquiring an eye image of a user and extracting the user's biometric parameters from the image; obtaining the user's environmental depth information and current inertial measurement data, and determining the user's wearing posture parameters based on these data; inputting the biometric parameters and posture parameters into a preset optical distortion mapping model to determine the distortion compensation amount for correcting the user's vision in the current posture; correcting image frames in the original rendered image based on the distortion compensation amount to obtain the target display image, and then outputting the target display image to the display module of the target display device for display. This solves the dynamic adaptation problem, enables real-time correction of the display image, reduces optical distortion, and improves the user experience.

The application discloses a projection lens and a display system. The projection lens comprises a display device, a lens assembly and an aperture stop arranged in sequence along a preset direction. The lens assembly comprises a plurality of lenses arranged along the preset direction. Wherein, 6mm≤f≤10mm, 26°≤FOV≤40°, 3mm≤h≤6mm, 4mm≤R≤10mm, 9mm≤L≤15mm. f is the focal length of the lens assembly, FOV is the field of view of the lens assembly, h is the aperture of the aperture stop, R is the aperture of the lens assembly, and L is the distance between the display device and the aperture stop along the preset direction AA. By reasonably designing the parameters of the lens assembly and the aperture stop, and adjusting the distance between the lens assembly and the aperture stop, various aberrations of the projection lens can be effectively corrected, the projection lens has the advantages of high resolution and small optical distortion, and the requirements of high resolution and high-quality imaging of the AR display device can be met.

The present invention discloses a telephoto lens and an electronic device. The telephoto lens includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens from the object side to the image side. The object side surface and the image side surface of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are all aspherical surfaces. The interval distance TTL of the imaging surface of the telephoto lens on the optical axis and the total effective focal length f of the telephoto lens satisfy 0.8 < TTL / f < 0.9. The total effective focal length f of the telephoto lens and the curvature radius R1 of the object side surface of the first lens and the curvature radius R8 of the image side surface of the fourth lens satisfy 4.0 < f / R1 < 4.6 and 0.3 < f / R8 < 1.4. The telephoto lens and the electronic device in the present invention can improve the resolution of the lens, reduce optical distortion, and ensure relative illumination while ensuring telephoto by controlling parameters such as the center thickness of each lens and the air gap.

The invention relates to the technical field of lens resin materials, in particular to a resin material for an anti-yellowing high-Abbe-number lens and a preparation method of the resin material. The invention relates to a resin material for an anti-yellowing high Abbe number lens, which is prepared from the following substances in parts by weight: 40 to 60 parts of 2, 3-bis [(2-mercaptoethyl) sulfenyl]-1-propanethiol, 45 to 65 parts of isocyanate and 0.03 to 0.05 part of catalyst, the isocyanate is prepared from any one of hexamethylene dicyanic acid ester, hydrogenated m-xylylene dimethyl diisocyanate, isophorone diisocyanate, 4, 4 '-dicyclohexylmethane diisocyanate and m-xylylene dimethyl diisocyanate. Compared with a traditional resin lens, the resin lens produced by polymerizing 2, 3-bis [(2-mercaptoethyl) sulfenyl]-1-propanethiol serving as a raw material and isocyanate has the advantages that the refractive index is effectively increased, and the resin lens has the characteristics of good yellowing resistance and high Abbe number.