Zoom lens and imaging apparatus

The zoom lens design with a specified intermediate lens group configuration addresses the challenge of achieving small size, wide angle, high zoom ratio, and high optical performance by optimizing the N lens group's refractive power and aberration correction, resulting in a compact and lightweight lens with improved optical performance.

JP2025175454APending Publication Date: 2025-12-03CANON KK
View PDF 1 Cites 0 Cited by

Patent Information

Application Number
JP2024081583
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-05-20
Publication Date
2025-12-03

AI Technical Summary

Technical Problem

Existing positive-lead zoom lenses face challenges in achieving a combination of small size, lightweight design, wide angle of view, high zoom ratio, and high optical performance, particularly due to the limited number of lenses in the lens group with the strongest negative refractive power.

Method used

The zoom lens configuration includes a first lens group with positive refractive power, an intermediate lens group with two or more moving lens groups, and a rear lens group with positive refractive power, where the intermediate lens group's N lens group has five or more lenses, including a UD lens with specific Abbe number and refractive power characteristics, satisfying conditional expressions to optimize aberration correction and compactness.

Benefits of technology

This configuration results in a zoom lens that is small, lightweight, offers a wide angle of view, high zoom ratio, and maintains high optical performance throughout the entire zoom range, effectively correcting aberrations and ensuring compactness.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure 2025175454000001_ABST
    Figure 2025175454000001_ABST
Patent Text Reader

Abstract

To provide a zoom lens advantageous in terms of compactness and light weight, a wide angle of view, a high magnification variation ratio, and high optical performance over the entire zoom range.SOLUTION: A zoom lens has, in order from an object side to an image side, a first lens group having positive refractive power not moving for magnification variation, an intermediate lens group comprising two or more lens groups moving for magnification variation, and a rear lens group having positive refractive power not moving for magnification variation. Every interval between the adjacent lens groups changes for magnification variation. Of the two or more lens groups included in the intermediate lens group, the lens group having the largest negative refractive power is defined as an N lens group, the N lens group has five or more lenses including a UD lens having negative refractive power, and three lenses of the five or more lenses form a cemented lens. The Abbe number based on the d-line of the UD lens is appropriately set.SELECTED DRAWING: Figure 1
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • Zoom lens and image capturing device

    JP2021032924A