240 degree field angle ultra-large pore diameter fish-eye lens base structure

Abstract

The invention discloses a basic structure of a fish-eye lens with a viewing angle of 240 degrees. The fish-eye lens comprises seven lens groups which are combined by ten lenses. By adopting the form of the structure, the viewing angle of the fish-eye lens which is composed of spherical surfaces is creatively raised to 240 degrees and the limiting aperture which can reach F / 1.4 to the maximum extent is kept and the other performances do not be reduced. As an overlarge viewing angle, a relatively big aperture, a supersized retrofocus ratio and an excellent image fault matching are adopted, therefore, single lens reflex, super viewing angle, and approximately all airspace, maritime-space and municipal shooting and monitoring can be realized in a plurality of fields, equidistant projection and showing of images, the shape change of which can be controlled, in an IMAX dome which is appropriate to the whole globe, and clear and bright images can be ensured. Meanwhile, the structure is compact, and the disadvantage of negative thickness of the edge of the lens is successfully eliminated; the fish-eye lens is easy to be processed and extremely has practical significance.

Description

technical field [0001] The patent of the present invention relates to a super-large-aperture fisheye lens structure with a maximum field of view of 240°. Specifically, using this structure, fisheye monitoring, projection, projection, photography, Photography, camera lens. This structure has a certain degree of versatility, and can be matched with film or other photoelectric coupling devices (CCD, CMOS, etc.), or used for projection of digital or analog signals; it can be used for full-field photography or video; it can also be used Detection and monitoring in special environments (tunnel or pipeline inner wall); it can also be used for security and military airspace monitoring. Background technique [0002] Fisheye lens is a very special kind of optical lens category. It belongs to fθ lens. It is generally used for shooting and projection in 120° to 180° field of view environment. The imaging principle is "non-similar imaging", that is, by introducing quantitative "distorti...

AI Technical Summary

Problems solved by technology

[0003] Fisheye lenses currently on the market include photography (camera), monitoring and projection lenses, and their field of view is around 180°. Occasionally, there are reports about lenses with a field of view above 200°, and the relative aperture of the lens is also in D. / f'=1 / 2.8~1 / 5.6 (D is the lens entrance pupil radius, f' is the focal length), there are three reasons why there is no fisheye lens with large aperture and large field of view; one is limited by specific use requirements Second, it is limited by design difficulty and design software. Third, even if a fisheye lens structure with a large field of view is occasionally found, its optical aberration can be well optimized and controlled, and most of them are expensive due to poor structural craftsmanship. Or cannot be mass-produced, and has no practical significance

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