Zoom Lens Aberration Control via Segmented Group Dynamics
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Solution Overview
Problem
Current zoom lenses with high zoom ratios face challenges in miniaturization, achieving wide angles exceeding 70°, and maintaining a lightweight focus group suitable for capturing moving images while suppressing aberrations across the zoom range, especially in digital cameras that require quiet operation to avoid noise from actuator driving sounds.
Innovation Solution
A zoom lens configuration comprising a specific arrangement of lens groups with varying intervals and focal lengths, including a first lens group with positive refractive power, a second lens group with negative refractive power, and a sixth lens group that moves on the optical axis for focusing, satisfying conditional expressions to achieve a wide angle, high zoom ratio, and aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a high zoom ratio is achieved using conventional zoom lens designs, then the zoom ratio increases, but the lens size increases and the wide angle end cannot achieve sufficient width
Solution Approach 1:
The zoom lens is divided into multiple lens groups (first through sixth lens groups) with alternating positive and negative refractive powers. Each lens group performs specific functions in the zooming process, allowing the lens to achieve high zoom ratios while maintaining a compact structure through coordinated movement of segmented groups rather than a single large lens assembly.
Solution Approach 2:
The zoom lens employs dynamic interval adjustment between adjacent lens groups during zooming operations. The intervals between lens groups are specifically designed to vary at zooming, enabling the lens to achieve high zoom ratios and wide angle coverage while maintaining miniaturization through optimized dynamic configuration rather than static design.
2Reliability
If a heavy second lens group is used for focusing from infinity to close proximity, then focusing range is achieved, but the focus group weight increases making it unsuitable for moving image capture
Solution Approach 1:
The focusing function is separated from the heavy second lens group and assigned to the sixth lens group, which is specifically designed as a lightweight focus group. This segmentation allows the second lens group to maintain its structural integrity for achieving focusing range while the sixth lens group provides the actual focusing movement with minimal weight for quiet operation during moving image capture.
Solution Approach 2:
The focusing function is extracted from the heavy second lens group and assigned to a dedicated sixth lens group. This extraction creates a separate, lightweight focus group that can perform focusing operations without the burden of additional lens elements, thereby reducing weight and actuator load while maintaining the required focusing range from infinity to close proximity.
3Adaptability or versatility
If the angle of view is increased to exceed 70 degrees at the wide angle end, then wide angle performance improves, but aberration control becomes more difficult
Solution Approach 1:
Each lens group is assigned specific refractive power characteristics (positive or negative) to address local optical requirements. The alternating positive-negative configuration allows each group to contribute differently to aberration correction, with the first lens group controlling wide angle performance and subsequent groups correcting specific aberrations, thereby achieving wide angle exceeding 70 degrees while maintaining aberration control.
Solution Approach 2:
The zoom lens employs parameter optimization including focal length ratios (5.7 ≤ f1/fw ≤ 10.0) and back focus constraints (−3.00 ≤ f6/bfw ≤ −1.35) to balance wide angle performance with aberration control. By carefully controlling optical parameters such as focal lengths, intervals, and refractive powers across the zoom range, the lens achieves wide angle exceeding 70 degrees while suppressing aberrations through mathematically optimized design parameters.
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 enables a miniaturized, high-performance zoom lens with a wide angle exceeding 70° and a lightweight focus group, suitable for capturing moving images while effectively suppressing aberrations and noise, contributing to the development of compact, high-performance digital devices.
Implementation Method 1
the sixth lens group moves on an optical axis at focusing in a range from an object at infinity to an object at close proximity
Implementation Method 2
a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens having positive refractive power, a fourth lens group having negative refractive power, a fifth lens group having positive refractive power, and a sixth lens group having negative refractive power
Data Source
AI summary
A zoom lens includes: in order from an object side, a first lens group having positive refractive power; a second lens group having negative refractive power; a third lens having positive refractive power; a fourth lens group having negative refractive power; a fifth lens group having positive refractive power; and a sixth lens group having negative refractive power.