Zoom Lens Cemented Group Perpendicular Shift for Blur Correction
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Solution Overview
Problem
Current zoom lenses fail to achieve both high image quality and compact size, especially when supporting larger picture elements with higher resolutions, and struggle to correct image blur effectively.
Innovation Solution
A zoom lens configuration comprising a first negative lens group, a second lens group with positive refractive power including cemented lenses, and a third positive lens group, where the second lens group's cemented lens with positive refractive power is shifted perpendicular to the optical axis to correct image blur, and specific conditional expressions are satisfied to optimize focal lengths and distances between lens groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional zoom lens structure is used, then the lens can achieve basic zoom functionality, but it cannot achieve ultra-high image quality required for larger picture elements with higher resolution
Solution Approach 1:
The zoom lens is divided into three distinct lens groups (first negative lens group, second positive lens group, third positive lens group) with specific internal structures. The second lens group is further segmented into multiple lens components including cemented lenses. This segmentation allows each group to be optimized for specific functions, achieving ultra-high image quality while maintaining manageable complexity through modular design.
Solution Approach 2:
Different regions of the lens system are assigned different optical properties. The first lens group uses negative refractive power for wide-angle coverage, the second lens group uses positive refractive power with cemented lenses for intermediate focusing, and the third lens group uses positive refractive power for telephoto capability. Each lens component has specifically designed curvature radii and refractive indices tailored to its local function, optimizing overall image quality.
2Measurement precision
If the lens structure is optimized for ultra-high image quality, then larger picture elements with higher resolution can be supported, but the lens size increases and compactness is reduced
Solution Approach 1:
The lens system utilizes precise control of optical parameters including refractive indices (nd, vd values), curvature radii, and axial distances between lens groups. By optimizing these parameters within specific ranges, the design achieves high image quality suitable for large picture elements while controlling the overall lens volume. The conditional expressions define optimal parameter ranges that balance resolution support with compact dimensions.
Solution Approach 2:
The lens groups are arranged in a nested configuration where the first, second, and third lens groups are positioned along the optical axis in sequence, with the aperture stop nested between the first and second lens groups. This nested arrangement allows efficient use of space, enabling the lens to achieve compact size while maintaining the optical path length necessary for high-resolution imaging.
3Reliability
If image blur correction is achieved by moving lens groups along the optical axis, then focusing can be corrected, but image blur from hand motion cannot be effectively corrected
Solution Approach 1:
Instead of correcting image blur solely by moving lens groups along the optical axis (one dimension), this invention introduces a second dimension of correction by enabling the second lens group to move perpendicular to the optical axis. This two-dimensional movement capability allows effective correction of hand motion blur while maintaining focusing functionality, significantly improving image stability and reliability.
4Measurement precision
If more lens components are added to correct aberrations, then image quality improves, but the lens becomes less compact and more complex
Solution Approach 1:
The lens system employs cemented lenses where multiple lens elements are optically bonded together. The second lens group includes cemented lenses with specific refractive index combinations (e.g., high refractive index lenses cemented to lower refractive index lenses). This composite structure achieves superior aberration correction equivalent to having separate lens elements, while reducing the overall physical volume and maintaining compactness by eliminating air gaps between cemented surfaces.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration results in a compact, ultra-high image quality zoom lens that supports larger and higher resolution picture elements, effectively correcting aberrations and maintaining image quality across zoom ranges.
Implementation Method 1
image blur is corrected by shifting the cemented lens having positive refractive power constituting the second lens group in a direction substantially perpendicular to the optical axis
Implementation Method 2
upon zooming from the wide-angle end state to the telephoto end state, the first lens group and the second lens group move so that the distance between the first lens group and the second lens group decreases, and the distance between the second lens group and the third lens group increases
Implementation Method 3
a first lens group having negative refractive power, a second lens group having positive refractive power, and a third lens group having positive refractive power
Data Source
AI summary
A zoom lens having, in order from an object, a first lens group G1 having negative refractive power, a second lens group G2 having positive refractive power, and a third lens group GH3 having positive refractive power, wherein the second lens group G2 is constituted only by three or more cemented lenses.