High-resolution, high-zooming-speed and small-volume variable focal length optical system

Abstract

The invention relates to a high-resolution, high-zooming-speed and small-volume variable focal length optical system, which can solve the problems of low resolution, slow zooming, large volume and thelike, and comprises a first lens group, a second lens group, a third lens group and a fourth lens group, wherein the first lens group, the second lens group, the third lens group and the fourth lensgroup are sequentially arranged at adjustable intervals; the fourth lens group can be used for adjusting a back focus; an aperture which moves with the third lens group and contributes to the controlof the calibers of the first lens group and the fourth lens group is arranged between the second lens group and the third lens group; the total focal lengths of the first lens group, the third lens group and the fourth lens group are positive; the total focal length of the second lens group is negative, and the focus of the first lens of the second lens group is also negative; and the first, second and third lens groups move together in a zooming process to zoom quickly. The optical system is mainly used in fields such as monitoring and photographic systems.

Description

【Technical field】 [0001] The invention relates to an optical system, in particular to an optical system with high resolution, fast variable magnification and small volume applied to monitoring and photographing systems. 【Background technique】 [0002] At present, zoom lenses for photography and security generally have the following disadvantages: large external dimensions, long zooming time, and low resolution. At present, there are only a few lenses that improve certain aspects at the expense of other aspects. For example, in order to achieve high resolution, the volume must be made large and the zoom time is very long. [0003] There is no lens that overcomes all the above shortcomings, so the zoom lenses for photography and security that are popular in the market now have large volumes, long zooming times, or low resolutions, and there are always shortcomings of one kind or another. There are great limitations in use, which cannot meet the needs of consumers such as smal...

AI Technical Summary

Problems solved by technology

[0002] At present, the zoom lenses for photography and security generally have such shortcomings: large size; long zooming time and low resolution

[0003] There is no lens that overcomes all the above shortcomings, so the zoom lenses for photography and security that are popular in the market now have large volumes, long zooming times, or low resolutions, and there are always shortcomings of one kind or another. There are great limitations in use, which cannot meet the needs of consumers such as small size, fast zooming, and clear image plane; and existing zoom lenses are restricted by mechanisms during the zooming process, and often have zoom blind spots, that is, in a certain The resolution near the focal length is poor, and the image is not very clear

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