Variable magnification optical system and optical apparatus
The variable magnification optical system addresses the challenge of miniaturization by optimizing lens group configurations and focal length ratios, ensuring high optical performance and compactness.
JP2026034704APending Publication Date: 2026-02-27NIKON CORP
Patent Information
- Application Number
- JP2025266904
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2022-09-09
- Filing Date
- 2025-12-19
- Publication Date
- 2026-02-27
AI Technical Summary
Technical Problem
Existing variable magnification optical systems face challenges in achieving good optical performance while being miniaturized.
Method used
A variable magnification optical system with a configuration of lens groups having specific refractive powers, where the first lens group is fixed relative to the image plane, and the spacing between adjacent lens groups changes to satisfy certain conditional expressions, effectively correcting spherical aberration, coma, and field curvature.
Benefits of technology
The system achieves a compact design with excellent optical performance, suitable for use in optical devices like cameras, by optimizing the focal length ratios and movements of lens groups.
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Smart Images
Figure 2026034704000001_ABST
Abstract
To provide a compact variable power optical system having excellent optical performance.SOLUTION: The variable magnification optical system ZL consists of, in order from an object, a first lens group G1 having a negative refractive power, a second lens group G2 having a positive refractive power, a third lens group G3 having a negative refractive power, and a fourth lens group G4 having a positive refractive power, wherein the first lens group G1 is fixed with respect to an image surface upon varying magnification, An interval between adjacent lens groups changes, the third lens group G3 moves on an optical axis during focusing from an object at infinity to a short-distance object, the third lens group G3 includes one lens, a negative lens is disposed at a second position counted from the most object side in the first lens group G1, and the following conditional expressions are satisfied. 0.80 <(-f1) / f2 <1.300.65 <f2 / (- f3) <1.000.20 <(-f1) / f4 <0.42 SELECTED DRAWING: Figure 1
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Citation Information
Patent Citations
Zoom lens and imaging apparatus
JP2019040029A