Continuous Zoom Lens with Seven Lens Groups for Mobile Imaging
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Solution Overview
Problem
Existing zoom lenses for portable electronic devices, such as mobile phones, suffer from incoherent zoom effects, unstable white balance, and significant performance loss due to the need to switch between multiple lenses.
Innovation Solution
A zoom lens comprising a first lens group with positive refractive power and a second lens group with negative refractive power, where the positions of the lenses are adjusted along the optical axis to achieve continuous zooming, with specific ratios and relationships between effective focal lengths and lens positions to optimize zoom capability and imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple lenses are used to simulate zoom effect, then zoom capability is improved, but coherence of zoom and white balance stability deteriorate
Solution Approach 1:
The patent combines multiple lens functions into a single integrated zoom lens system with seven lens groups, eliminating the need to switch between separate wide-angle, standard, and telephoto lenses. This unified structure maintains consistent optical characteristics throughout the zoom range, ensuring coherence and stable white balance while providing continuous zoom capability from 0.65x to 3.9x.
Solution Approach 2:
The patent employs dynamic adjustment of lens group positions along the optical axis during zooming. The first through seventh lens groups move at different speeds and distances according to specific zoom states, enabling continuous focal length variation while maintaining optimal optical performance and coherence throughout the zoom range.
2Adaptability or versatility
If multiple lenses are switched to achieve zoom, then focal length range is improved, but performance loss increases
Solution Approach 1:
The patent implements continuous zooming action within a single lens system, eliminating the discontinuous switching between separate lenses. The seven lens groups work together continuously across the entire zoom range, maintaining optimal optical performance and minimizing light loss without the performance degradation associated with lens switching and digital cropping.
3Adaptability or versatility
If lens positions are adjusted for zooming, then zoom capability is improved, but device complexity increases
Solution Approach 1:
The patent divides the zoom lens into seven distinct lens groups with specific refractive power characteristics (positive and negative). Each lens group is independently positioned along the optical axis, allowing complex zoom functionality to be achieved through coordinated movement of segmented components rather than a single complex assembly.
4Manufacturing precision
If more lenses are added to improve zoom quality, then imaging quality is improved, but lens movement distance increases
Solution Approach 1:
The patent arranges seven lens groups in a compact nested configuration along the optical axis, where each lens group is positioned within a constrained space. This nested structure allows the lens groups to achieve the required movement distances for high-quality zooming while maintaining a compact overall form factor and minimizing the total movement range needed.
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 continuous zooming with improved imaging quality, reduced lens movement, and a more compact design, addressing the limitations of multi-lens systems.
Implementation Method 1
a first lens group having a positive refractive power, comprising a first lens disposed along the optical axis; and a second lens group having a negative refractive power, comprising a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens disposed in order along the optical axis
Data Source
AI summary
A zoom lens includes in order from an object side to an image side along an optical axis a first lens group having a positive refractive power, including a first lens disposed along the optical axis, and a second lens group having a negative refractive power, including a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens disposed in order along the optical axis. Positions of the second lens to the seventh lens on the optical axis can be changed to achieve continuous zooming of the zoom lens. A total effective focal length ft of the zoom lens when it is in a final state and a total effective focal length fs of the zoom lens when it is in an initial state satisfy 1.3<ft/fs<1.5.