Long-focus type panoramic annular imaging lens

Abstract

The invention provides a long-focus type panoramic annular imaging lens. The long-focus type panoramic annular imaging lens is totally composed of eleven spherical lenses, and comprises a panoramic annular lens assembly and a transferring lens assembly. The panoramic annular lens assembly comprises a first lens, a second lens and a third lens coaxial and arranged sequentially from an object space to an image space, and is of a triplet panoramic annular lens structure. The transferring lens assembly is composed of eight lens including a negative meniscus lens, a positive lens and two doublets. The long-focus type panoramic annular imaging lens satisfies f-theta object-image relation, and has the advantages of high resolution, super large field of view (360 degrees in the horizontal direction and 60 degrees in the vertical direction), high imaging quality and the like; adopted glass is ordinary optical glass excluding special glass and calcium fluoride; the lens structure is good in manufacturability to the benefit of processing and reduction of cost.

Description

technical field [0001] The invention belongs to the technical field of optical imaging lenses, and relates to a telephoto panoramic annular imaging lens, in particular to a telephoto lens with high resolution, (40°-100°)×360° super large field of view and good imaging quality. Focus type panoramic ring lens. Background technique [0002] At present, the existing wide-angle imaging lens cannot meet the requirements of 360° all-round acquisition of target information. Early panoramic imaging was basically realized by the rotation stitching method. Rotary mosaic method includes single-lens rotational scanning imaging and multi-lens staring imaging. Single-lens rotary scanning imaging refers to the use of a single ordinary optical lens to rotate around a mechanical axis perpendicular to the optical axis for panoramic scanning, and then seamlessly stitching through image stitching software to obtain panoramic images. However, there is a scanning period in single-lens rotary sc...

AI Technical Summary

Problems solved by technology

However, there are essential deficiencies: (1) the first refraction surface and the first reflection surface of the panoramic annular lens are free-form surfaces, which are more difficult to process than spherical surfaces, and the PMMA engineering plastics used have a large thermal expansion coefficient and poor surface hardness, which is easy to (2) The radius of curvature of the first surface of the last lens is relatively small, and the off-axis light enters the lens at a large incident angle, and too much light energy is lost, reducing the illumination of the image surface, which is not conducive to the improvement of imaging quality improve

In addition, the last lens is similar to a plano-convex lens with a relatively large thickness, which increases the weight and cost of the lens; (3) the relative aperture and vertical field of view of the panoramic imaging lens are small, and the optical performance needs to be further improved; (4) the rear of the system The working distance is short, which is not conducive to the installation of protective glass, optical filters and other mechanical structures

Images