Five-Group Zoom Lens Thickness and Aberration Control
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Solution Overview
Problem
Conventional zoom lenses are not thin enough and do not achieve optimal optical performance.
Innovation Solution
A zoom lens configuration comprising a first lens group with positive refractive power, a second lens group with negative refractive power, a third lens group with positive refractive power, a fourth lens group with negative refractive power, and a fifth lens group with positive refractive power, where the distances between each lens group change during zooming, and the first lens group is composed of two lenses, satisfying specific conditional expressions to minimize thickness and correct aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of lens groups is increased to improve optical performance, then aberration correction is enhanced, but the overall thickness of the zoom lens increases
Solution Approach 1:
The zoom lens is divided into five distinct lens groups (G1-G5) with alternating positive and negative refractive powers. Each group is strategically positioned and designed to address specific aberration types, allowing comprehensive optical correction while maintaining a compact overall structure through efficient spatial arrangement.
Solution Approach 2:
Each lens group is assigned specific optical functions: G1 (positive) for initial convergence, G2 (negative) for divergence and focal length adjustment, G3 (positive) for intermediate correction, G4 (negative) for aberration control, and G5 (positive) for final focusing. This localized functional assignment optimizes the contribution of each group to overall optical performance while minimizing redundant elements.
2Length of moving object
If the first lens group is made thinner to reduce overall lens thickness, then compactness is improved, but optical performance deteriorates
Solution Approach 1:
The first lens group G1 is designed with a specific thickness parameter constraint (0.07 < D1/fw < 0.46) that optimizes the balance between compactness and optical performance. By carefully controlling the thickness parameter D1 relative to the focal length fw, the design achieves reduced overall thickness while maintaining adequate optical functionality through the coordinated action of all five lens groups.
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
The solution results in a thinner zoom lens with outstanding optical performance by properly correcting image surface fluctuations and aberrations, while maintaining a compact design.
Implementation Method 1
a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, a third lens group G3 having a positive refractive power, a fourth lens group G4 having a negative refractive power, and a fifth lens group G5 having a positive refractive power
Data Source
AI summary
A first lens group (G1) having a positive refractive power, a second lens group (G2) having a negative refractive power, a third lens group (G3) having a positive refractive power, a fourth lens group (G4) having a negative refractive power, and a fifth lens group (G5) having a positive refractive power are arranged in order along an optical axis from an object, and distances between each lens group change when zooming, and the first lens group (G1) is composed of two lenses, and the following expression (1) is satisfied:0.07<D1/fw<0.46where D1 denotes a thickness on the optical axis of the first lens group (G1), and fw denotes a focal length of the zoom lens (ZL) in a wide-angle end state.