optical zoom lens

Abstract

The invention relates to an optical zoom lens. From an object side to an image-forming side, the optical zoom lens comprises a first lens group with negative diopter, a second lens group with positive diopter, and a third lens group with positive diopter. The optical zoom lens meets the following conditions: DG1 / fw>0.72, DG2 / fw<0.72 and TTL / fw<7.0, wherein, fw represents a focal length at a wide angle end of the optical zoom lens, DG1 represents a thickness of the first lens group, DG2 represents the thickness of the second lens group, and TTL represents a distance of the object side of the first lens group to an imaging surface.

Description

technical field [0001] The invention relates to an optical zoom lens, in particular to an optical zoom lens with high wide angle, high zoom ratio, small volume and good imaging quality. Background technique [0002] Existing known image capture devices, such as digital cameras or digital video cameras, mostly combine lens modules and image sensors to form images of objects to be photographed, mainly using lens modules to allow light beams from objects to be photographed Refraction is generated, so that the image of the object to be photographed is gathered on the image sensor, and the analog optical signal is converted into a digital electronic signal through the image sensor, and then subsequent image processing, storage and transmission are performed. [0003] The lens module of the image capture device is usually composed of multiple lenses (Lens) or prisms (Prism). Plastic lenses are used instead of glass lenses. However, due to the disadvantages of easily absorbing wa...

AI Technical Summary

Problems solved by technology

However, due to the shortcomings of the plastic material itself, which is easy to absorb water vapor and has a high light absorption rate, while using plastic lenses to reduce costs, it may not be possible to take into account the thinner and lighter lens modules and the high-magnification imaging quality

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