Scaling optical system, optical device, and manufacturing method of scaling optical system
The variable magnification optical system addresses the challenge of achieving good optical performance and compactness by employing specific lens group configurations and focal length relationships, ensuring effective aberration correction.
JP2025147224APending Publication Date: 2025-10-06NIKON CORP
Patent Information
- Application Number
- JP2025132459
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2021-06-15
- Filing Date
- 2025-08-07
- Publication Date
- 2025-10-06
Smart Images
Figure 2025147224000001_ABST
Abstract
To provide a scaling optical system having excellent optical performance while realizing miniaturization and reduced weight.SOLUTION: A scaling optical system (ZL) has a first lens group (G1) having positive refractive power, a second lens group (G2) having negative refractive power, a third lens group (G3) having positive refractive power, a fourth lens group (G4) having negative refractive power, and a fifth lens group (G5) having negative refractive power lined up in sequence from an object side along a light axis, the interval between the respective, adjacent lens groups is changed in scaling, the fourth lens group (G4) is a focusing lens group traveling along a light axis at the time of focusing, and the following conditional expression is satisfied, namely 0.11<f4 / f5<0.70, where f4 is a focal length of the fourth lens group (G4) and f5 is a focal length of the fifth lens group (G5).SELECTED DRAWING: Figure 1
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Citation Information
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