5results about How to "Small optical distortion" patented technology

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 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.

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.