Large aperture wide angle small imaging system

Abstract

The invention discloses a large aperture wide angle small imaging system. The system includes, successively from an object plane to an image plane, a first lens, a second lens, a third lens, a fourth lens, a light filter, and a photosensitive plate, the first lens is a non-spherical lens having a positive focal length, the two surfaces of the first lens are convex, the second lens is a non-spherical lens having a negative focal length, and the two surfaces of the second lens are concave, a third lens is a non-spherical lens having a positive focal length, the surface, facing the object plane, of the third lens is concave, and the surface, facing the image plane, of the third lens is convex, the fourth lens is a non-spherical lens having a negative focal length and is M-shaped; the effective diameter h of the surface, facing the image plane, of the fourth lens is h, the surface tangent line and the surface normal line at the effective diameter h is at an angle of 90 degrees, the included angle of the emitting main light d and the surface normal line c at the effective diameter h is e and satisfies 0<e<0.5 degrees. The imaging system can be applied to the real shooting environment requiring large-angle light and having the strict requirement, so that the needed loading space is saved.

Description

【Technical field】 [0001] The invention relates to an optical system, in particular to a small imaging system with a large aperture and wide angle. 【Background technique】 [0002] The small optical system currently used has some disadvantages. Under the light source with high light energy intensity or sunlight, strong ghost images will appear. When the shooting angle is large, there will be internal reflection of the lens, The stray light caused by the reflection of the surface of the spacer and the pressure ring leads to the deterioration of the overall image quality, or extra light or abnormally shaped images appear in the image. [0003] This invention just proposes based on the shortcoming that above-mentioned prior art exists. 【Content of invention】 [0004] The technical problem to be solved by the present invention is to provide a small-sized imaging system with a large aperture and wide angle, which can be used in a real shooting environment that requires a larger ...

AI Technical Summary

Problems solved by technology

[0002] The small optical system currently used has some disadvantages. Under the illumination of a light source with high light energy intensity or sunlight, strong ghost images will appear. The stray light caused by the surface reflection of the spacer and the pressure ring leads to poor image quality of the overall picture, or extra light or abnormally shaped images appear in the picture

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