Lightweight panoramic optical system

Abstract

A lightweight panoramic optical system of the present invention comprises a head unit, a subsequent lens group and a lens barrel, the head unit comprises a head lens and a reflection block arranged on the head lens, the head lens is arranged at the large-aperture end of the lens barrel, and the reflection block is located in a cavity enclosed by the head lens and the large-aperture end of the lens barrel. The reflection block is provided with a first reflection surface and faces the image space; the large-aperture end of the lens barrel is provided with a second reflecting surface which is circumferentially distributed along the hollow inner cavity of the lens barrel and faces the object side; the small-caliber end of the lens cone is correspondingly provided with a sensor, and the subsequent lens group is arranged in the hollow inner cavity of the lens cone; wherein the head lens, the reflection block, the lens cone and the subsequent lens group are coaxially distributed; light is refracted through the head lens, then is sequentially reflected by the second reflecting surface and the first reflecting surface, enters the subsequent lens group through the through hole in the middle of the second reflecting surface, and is received by the sensor. The light-weight panoramic optical system is lighter and firmer in structure, higher in design freedom degree and simpler in processing technology.

Description

technical field [0001] The invention belongs to the field of imaging technology, and in particular relates to a lightweight panoramic optical system. Background technique [0002] With the development of computer vision and artificial intelligence, there are more subdivided and clear requirements for optical sensors, and the large field of view optical system is also an important branch, for example, vehicle-mounted 360 surround view shooting, industrial scene monitoring, panoramic video conferencing , smart home and other scenarios require a large field of view optical system to achieve. At present, the common large field of view optical systems mainly include the following three types: [0003] 1. Stitched panoramic imaging, which is fixed according to a certain structure through multiple camera modules, and each camera shoots images from different angles, and finally splicing to achieve a large field of view shooting; since algorithms are required for image splicing, the...

AI Technical Summary

Problems solved by technology

[0003] 1. Stitched panoramic imaging, which is fixed according to a certain structure through multiple camera modules, and each camera shoots images from different angles, and finally splicing to achieve a large field of view shooting; since algorithms are required for image splicing, the captured The real-time performance is not high, and multiple camera modules are required to form the system at the hardware level, resulting in a complex system structure, large volume, and high stability requirements;

[0004] 2. Fisheye lens panoramic imaging, refraction and compression of light with a large field of view through the lenses farthest from the image surface; large field of view shooting is achieved through a single lens, but simple refraction and compression of light will lead to difficult design and lens Problems such as complex structure and low edge illumination will also introduce a large amount of edge negative distortion, which requires high algorithm requirements;

Common catadioptric panoramic imaging includes two types: (1) split catadioptric scheme, for example, a 360-degree high-definition surround-view panoramic lens disclosed in the patent document CN103901582B, the entire optical system can be divided into two parts, the top The reflective surface gathers and reflects the light in the object space into the optical system below. The main disadvantages are: the top reflective surface generally needs to be made aspherical, and the processing difficulty and cost will increase; moreover, the split structure needs to introduce a cylinder outside the optical system. The shape support structure has higher requirements for assembly, and the structural stability is easily affected, which will introduce stray light and additional aberrations; since there is only one reflective surface, the distortion of the system cannot be well controlled

(2) panoramic ring optical system, for example, the publication number is a kind of super large field of view spherical panoramic ring optical system disclosed in the patent literature of CN110824673A, the mirror group of its head is provided with two reflective surfaces, realizes large field of view The light is collected and then reflected into the follow-up optical system, which has good structural stability. The double reflection of the head can also ensure that aberration correction and distortion control can be achieved with less follow-up mirror groups, but its shortcomings The reason is: the head needs to process three optical surfaces (namely a reflective surface and two transmissive surfaces) on the first lens during processing, which is difficult to process; in addition, if the head adopts a double-glued structure, it is necessary to combine the two The gluing of lenses with large diameter differences also has strict requirements on processing; moreover, the head is a solid glass structure, and the diameter is usually large, so it is difficult to achieve lightweight design.

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