Zoom Lens Assembly Miniaturization via Air Space Optimization
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Solution Overview
Problem
Existing zoom lenses face challenges in achieving high definition and miniaturization due to instability in definition and difficulty in miniaturizing, particularly in mobile phone applications where switching multiple lenses with fixed focal lengths results in significant definition loss during zooming.
Innovation Solution
A zoom lens assembly is designed with a configuration that includes a first lens group, a second lens group with positive refractive power, a third lens group with positive refractive power, and a fourth lens group, where the Total Track Length (TTL) and the difference in effective focal lengths between the wide and tele ends are optimized, along with movable lens groups and a diaphragm, to reduce astigmatism and distortion, ensuring high definition and miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple lenses with fixed focal lengths are switched to achieve zooming, then the field of view and scenery scope can be changed, but significant definition loss occurs during zooming
Solution Approach 1:
The patent employs multiple lens groups (first, second, third, and fourth lens groups) that move dynamically along the optical axis during zooming. The second and third lens groups are specifically configured to move relative to each other to continuously change the effective focal length, enabling smooth transitions between wide-angle and telephoto views without switching lenses, thereby maintaining definition throughout the zoom range.
2Measurement precision
If a zoom lens assembly is designed with multiple movable lens groups to achieve continuous focal length change, then high definition can be maintained, but the device becomes difficult to miniaturize
Solution Approach 1:
The patent optimizes specific parameter ratios to achieve miniaturization while maintaining definition. Key parameters include controlling the ratio of effective focal lengths at wide end and tele end (1.5≤fw/ft<3.0), the refractive powers of lens groups, and the air spaces between lens groups (all greater than 0.5mm). These parameter optimizations enable compact design with reduced total track length while preserving imaging quality.
Solution Approach 2:
The zoom lens assembly is divided into four distinct lens groups with specific functions: the first lens group for basic focusing, the second and third lens groups for zooming (with positive refractive power), and the fourth lens group for fine-tuning. This segmentation allows each group to be optimized independently for size and function, contributing to overall miniaturization.
3Volume of moving object
If the air spaces between lens groups are reduced to miniaturize the assembly, then the size decreases, but astigmatism and distortion increase
Solution Approach 1:
The patent specifies that air spaces between adjacent lens groups must be greater than 0.5mm to maintain proper optical path lengths and ray angles. This parameter constraint ensures that astigmatism and distortion remain within acceptable ranges while still achieving miniaturization through optimized lens group configurations and refractive power distributions.
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 effectively reduces astigmatism and distortion, improving imaging quality and enabling continuous focal length change from wide to tele end, while ensuring high definition and miniaturization of the zoom lens assembly.
Implementation Method 1
a second lens group G2 with a positive refractive power, spaced from the first lens group G1 by a first air space and movable on the optical axis; a third lens group G3 with a positive refractive power, spaced from the second lens group G2 by a second air space
Data Source
AI summary
The disclosure provides a zoom lens assembly, which sequentially includes from an object side to an image side along an optical axis: a first lens group; a second lens group with a positive refractive power, spaced from the first lens group by a first air space and movable on the optical axis; a third lens group with a positive refractive power, spaced from the second lens group by a second air space and movable on the optical axis; and a fourth lens group, spaced from the third lens group by a third air space; wherein a Total Track Length (TTL) of the zoom lens assembly and a difference Δf between an effective focal length of the zoom lens assembly at a wide end and an effective focal length of the zoom lens assembly at a tele end satisfy 2.5<TTL/|Δf|<4.0.