Large-aperture-ratio telescopic zoom lens

By adopting the design of multi-lens group and lens group spacing changes in large-diameter telephoto zoom lenses, combined with the aperture stop and subsequent lens groups, the problem of difficulty in lightening the focus lens group and anti-vibration lens group is solved, and high optical performance and quiet and high-speed focusing are achieved.

CN119667920APending Publication Date: 2025-03-21SIGMA CORP
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Patent Information

Application Number
CN202410572772.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2023-09-19
Filing Date
2024-05-10
Publication Date
2025-03-21

AI Technical Summary

Technical Problem

While existing large-diameter telephoto zoom lenses achieve high optical performance, it is difficult to achieve lightweighting of the focus lens group and the anti-vibration lens group, resulting in larger actuators, increased noise or reduced speed.

Method used

In a large-diameter telephoto zoom lens, multiple lens groups are sequentially arranged from the side of the object to the image side, and the spacing between adjacent lens groups changes when zooming, combined with the design of the aperture stop and subsequent lens groups, the size and weight of the focus lens group and the anti-vibration lens group are achieved.

Benefits of technology

It realizes the high optical performance of miniaturization and lightweight while equipped with an anti-vibration mechanism and a quiet and high-speed focusing mechanism, and avoids the problems of larger actuators and increased noise.

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Abstract

The invention provides a telescopic zoom lens with a large aperture ratio. The zoom lens comprises, in order from the object side to the image side, a first lens group (G1) having a positive refractive power that is fixed with respect to the image surface during zooming, a second lens group (G2) having a negative refractive power, a third lens group (G3) having a negative refractive power, a fourth lens group (G4) having a positive refractive power, an aperture stop (S), and a subsequent lens group (GR) comprising a plurality of lens groups. The distance between adjacent lens groups varies, and the subsequent lens group (GR) has a focusing lens group that moves when focusing from an object at infinity to an object at a close distance, and the large-aperture-ratio zoom lens satisfies a specific conditional expression.
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