Optical systems and optical instruments

The optical system with a specific lens group configuration and focal length relationships minimizes aberration fluctuations and lens weight, enabling high-speed autofocus and good optical performance.

JP2026110830APending Publication Date: 2026-07-02NIKON CORP
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
NIKON CORP
Filing Date
2026-04-28
Publication Date
2026-07-02

AI Technical Summary

Technical Problem

Conventional optical systems with multiple lens groups moving along the optical axis for focusing face challenges in suppressing aberration fluctuations and lens weight, making high-speed autofocus difficult.

Method used

The optical system comprises a front group with a leading positive lens group, a first focusing lens group and a second focusing lens group with negative refractive power, all moving along different trajectories, along with specific focal length relationships to minimize aberration and lens weight, allowing for high-speed autofocus.

Benefits of technology

This configuration achieves minimal aberration variation during focusing, enabling good optical performance with large apertures and lighter lens groups, reducing sensitivity to manufacturing errors and facilitating high-speed autofocus.

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Abstract

To provide an optical system with minimal aberration variation during focusing. [Solution] The optical system OL has a leading lens group GA1 with positive refractive power, a first focusing lens group GF1 with negative refractive power, a positive lens group GP with positive refractive power, a second focusing lens group GF1 with negative refractive power, and a final lens group GE, all arranged in order from the object side along the optical axis. When focusing from an object at infinity to an object at a close distance, the first focusing lens group GF1 and the second focusing lens group GF2 move toward the image plane along the optical axis along different trajectories. The first focusing lens group GF1 consists of one or two lenses, and the second focusing lens group GF2 consists of two lenses, satisfying the following condition. 0.50 <fA / (-fF1)<1.50 0.50 <f / (-fF1)<1.80 However, fA: Focal length of the leading lens group GA1 fF1: Focal length of the first focusing lens group GF1 f: focal length of optical system OL
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