Zoom lens

Abstract

The embodiment of the invention discloses a zoom lens. The zoom lens comprises a focusing group, a fixed group and a zoom group which are sequentially arranged from an object space to an image space;in the zooming process, the position of the fixed group is fixed, and the zooming group and the focusing group move along an optical axis; wherein the focal power of each group at the wide-angle end relative to the zoom lens satisfies a certain relational expression; the focusing group comprises a first lens, a second lens and a third lens, the fixed group comprises a fourth lens, and the zoom group comprises a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens; the sixth lens and the seventh lens form a cemented lens group, and the focal power of each lensrelative to the corresponding group is set to satisfy a certain relational expression. According to the embodiment of the invention, the zoom lens can be formed by mixing four glass lenses and six plastic lenses, the manufacturing cost of the zoom lens can be properly reduced, light weight is realized, meanwhile, the visible light aberration is well corrected, and a confocal effect of visible light and infrared light is ensured.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of optical lenses, and in particular, to a zoom lens. Background technique [0002] The zoom all-in-one machine has a wide range of applications in security fields such as smart transportation and face recognition. At present, there are many types of all-in-one zoom machines on the market, but if you want to achieve better imaging effects, you need more combinations of glass spherical lenses, or more combinations of glass aspherical lenses, which makes the production of all-in-one zoom machines difficult. Increased, expensive and heavy. However, if low cost is required and the glass spherical lens and glass aspheric lens are reduced as much as possible, better optical effects cannot be obtained. Contents of the invention [0003] The present invention provides a zoom lens to use fewer glass spherical lenses and glass aspheric lenses to achieve a 1 / 1.8-inch CMOS target surface, a dia...

AI Technical Summary

Problems solved by technology

At present, there are many types of all-in-one zoom machines on the market, but if you want to achieve better imaging effects, you need more combinations of glass spherical lenses, or more combinations of glass aspherical lenses, which makes the production of all-in-one zoom machines difficult. Increased, expensive and heavy

However, if low cost is required and glass spherical lenses and glass aspheric lenses are reduced as much as possible, better optical effects cannot be obtained.

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