Zoom lens and imaging apparatus

By optimizing the configuration and movement of the front and rear lens groups, the problem of small size and light weight of the ultra-telephoto zoom lens when achieving a longer focal length is solved, high-quality imaging effects are achieved, and the driving mechanism is simplified.

CN120604157APending Publication Date: 2025-09-05SONY GROUP CORP
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Patent Information

Application Number
CN202380091188.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2023-01-20
Filing Date
2023-12-05
Publication Date
2025-09-05

AI Technical Summary

Technical Problem

Existing ultra-telephoto zoom lenses are difficult to meet the needs of small size, light weight and high image quality while achieving a longer focal length, especially because the weak positive refractive power closest to the object makes it difficult to correct various aberrations.

Method used

A specific configuration of the front lens group and the rear lens group is adopted. The front lens group includes a fixed positive lens group, a moving negative lens group and a moving positive lens group. The rear lens group includes a focus lens group. By optimizing the refractive power and movement of the lens group, specific conditional expressions are met to achieve a longer focal length and short total optical length, and the driving mechanism is simplified by the fixed aperture stop and the final lens group.

Benefits of technology

It realizes the small size and light weight of the lens system while having a longer focal length at the telephoto end, and effectively corrects various aberrations, simplifies the driving mechanism and improves the imaging quality.

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Abstract

A zoom lens of the present disclosure is provided with: a front-side lens group; and a rear-side lens group including a focus lens group disposed on a side closest to the object, the focus lens group moving in an optical axis direction when focusing from the object at infinity to the object at a proximal side. The front-side lens group includes: a first positive lens group disposed on a side closest to an object, fixed at the time of zooming, and having a positive refractive power; one or more negative lens groups moving at the time of zooming, and each having a negative refractive power; and one or more second positive lens groups moving at the time of zooming, and each having a positive refractive power. The lens group having the strongest negative refractive power among the one or more negative lens groups moves at the time of zooming to allow an interval from the first positive lens group to be maximum at the telephoto end.
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Citation Information

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