Zoom Lens Aberration Control via Segmented Group Spacing
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Solution Overview
Problem
Existing zoom lenses struggle to maintain high optical performance while achieving a wide angle, high zoom ratio, and compact configuration while minimizing aberration variations during magnification and focusing.
Innovation Solution
A zoom lens design comprising specific refractive power configurations for lens groups, including a first lens group with negative power, a second lens group with positive power, a third lens group with positive power, a fourth lens group with negative power, and a middle group with adjustable lens groups, where certain lens spacings and movements are optimized to suppress aberrations and ensure high performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a zoom lens is designed with a wide angle and high zoom ratio, then the field of view and magnification range are improved, but aberration variations increase during magnification and focusing
Solution Approach 1:
The first lens group is divided into three partial groups (first A, first B, and first C partial groups) that can move independently during focusing. This segmentation allows each partial group to be optimized for specific aberration corrections, enabling the lens to maintain high optical performance across the full zoom range while achieving wide angle and high zoom ratio
Solution Approach 2:
The patent implements dynamic focusing by allowing the first A, first B, and first C partial groups to change spacings relative to each other during focusing operations. This dynamic adjustment mechanism enables real-time correction of aberrations as the magnification changes, resolving the contradiction between high zoom ratio and aberration suppression
2Volume of moving object
If the lens configuration is made compact, then the size is reduced, but aberration control becomes more difficult
Solution Approach 1:
The patent employs a nested arrangement where the first A, first B, and first C partial groups are positioned within the first lens group in a compact configuration. This nesting allows multiple functional elements to be integrated in a space-efficient manner, achieving compact lens size while maintaining the ability to correct aberrations through coordinated movement of the partial groups
3Ease of operation
If multiple lens groups are made movable for focusing, then focusing flexibility is improved, but device complexity increases
Solution Approach 1:
The first lens group is segmented into three independently movable partial groups (first A, first B, and first C), each capable of changing spacing during focusing. This segmentation provides flexible focusing control across different magnification ranges while managing complexity through modular design, where each partial group can be controlled independently or in coordination
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 design achieves satisfactory suppression of aberrations and maintains high optical performance with a wide angle and high zoom ratio, while keeping the lens configuration compact.
Implementation Method 1
a first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a positive refractive power, a fourth lens group having a negative refractive power
Data Source
AI summary
A zoom lens consists of a first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a positive refractive power, a fourth lens group having a negative refractive power, a middle group including one or more lens groups, and a final lens group having a positive refractive power in order from an enlargement side to a reduction side. The first lens group consists of a first A partial group having a negative refractive power, a first B partial group, and a first C partial group in order from the enlargement side to the reduction side. During focusing, a spacing between the first B partial group and an adjacent partial group changes. A spacing between the second lens group and the third lens group at a telephoto end is shorter than that at a wide angle end.