A kind of lens and imaging device

Abstract

The invention relates to a lens and an imaging device. The lens comprises a front lens group close to an object side, a rear lens group close to an image side, a reflection element and a diaphragm, wherein the front lens group comprises a first lens and a second lens; the rear lens group comprises a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens; the front lens group is a negative refractive index lens group, and the rear lens group is a positive refractive index lens group; the reflection element is arranged between the second lens and the third lens; the diaphragm is arranged between the third lens and the fourth lens. According to the invention, through the reflection element, the dimension of front and rear lens groups in a direction is reduced.

Description

technical field [0001] The invention relates to the technical field of optical lenses, in particular to a lens and an imaging device. Background technique [0002] At present, to obtain full spatial information, two imaging optical systems that face each other or are staggered can be used. Each optical system includes a wide-angle lens with a field of view greater than 180 degrees and an imaging sensor device that matches the wide-angle lens. The image information in all directions is simultaneously obtained through the two imaging optical systems, and the image information of 4π solid angle full space is formed by unfolding and splicing of the overlapping areas. [0003] However, the use of two wide-angle lenses with a field of view larger than 180 degrees will inevitably lead to the problem of separation of optical centers, and the separation of optical centers will degrade the image in the overlapping area of ​​the image. Moreover, the farther the distance between the tw...

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Problems solved by technology

[0003] However, the use of two wide-angle lenses with a field of view larger than 180 degrees will inevitably lead to the problem of separation of optical centers, which will degrade the image in the overlapping area of ​​the image

Moreover, the farther the two wide-angle lenses are from each other in the direction of the optical axis, the more obvious the degradation of the overlapping part of the image will be.

[0004] In addition, the inventors of the present invention found in the process of implementing the invention that the existing wide-angle lens structure with a field of view exceeding 180 degrees often has vignetting at the large field of view, so that the light in the field of view cannot fill the entire field of view

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