Zoom Lens Continuous Focal Length Adjustment via Movable Groups
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Solution Overview
Problem
Conventional mobile phone zoom lenses implement hybrid optical zoom using multiple lenses with discontinuous focal lengths, resulting in poor imaging definition and limited continuous zoom capability, affecting photographing quality.
Innovation Solution
A zoom lens configuration with three or four lens groups, including a fixed negative focal power first lens group, a movable positive focal power second lens group, and a compensation negative focal power third lens group, which adjust focal length by moving along the optical axis, allowing continuous zoom and improved imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple lenses with different focal lengths are mounted to implement hybrid optical zoom, then the zoom range is widened, but the imaging definition deteriorates within discontinuous focal length ranges
Solution Approach 1:
The patent implements continuous zoom capability by making the lens groups movable along the optical axis. The second lens group (positive focal power) and third lens group (negative focal power) are configured to move relative to each other, enabling smooth focal length adjustment without discrete steps. This dynamic configuration eliminates the discontinuous focal length ranges inherent in fixed multi-lens systems, thereby maintaining high imaging definition across the entire zoom range while achieving a wider adaptability.
2Adaptability or versatility
If multiple lenses with discontinuous focal lengths are used, then the zoom range is extended, but the photographing quality is reduced
Solution Approach 1:
The patent achieves continuous zoom by configuring the second and third lens groups to move along the optical axis in a coordinated manner. The distance between these lens groups changes continuously during zoom operation, enabling smooth transition through all focal lengths without interruption. This continuous adjustment mechanism ensures consistent photographing quality across the entire zoom range, eliminating the quality degradation that occurs in discontinuous focal length transitions of conventional hybrid zoom systems.
3Measurement precision
If lens groups are configured to move along the optical axis for continuous zoom, then the imaging quality is improved, but the device complexity increases
Solution Approach 1:
The patent divides the zoom lens into multiple functional lens groups: a first lens group (negative focal power, fixed), a second lens group (positive focal power, movable), and a third lens group (negative focal power, movable). This segmentation allows each group to perform specific functions - the first group provides fixed optical power, while the second and third groups work together to enable continuous zoom through their coordinated movement. This modular segmentation simplifies the overall design compared to a fully movable multi-lens system, as only two of the three groups require movement mechanisms.
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 zoom with enhanced imaging quality by optimizing the movement of lens groups, reducing aberrations and optical distortions, and increasing the zoom range while maintaining a compact design suitable for mobile devices.
Implementation Method 1
The first lens group is a lens group with negative focal power, the second lens group is a lens group with positive focal power, and the third lens group is a lens group with negative focal power
Data Source
AI summary
A zoom lens, a camera module, and a mobile terminal. The zoom lens includes a first lens group with negative focal power, a second lens group with positive focal power, and a third lens group with negative focal power that are sequentially arranged from an object side to an image side. The first lens group is a fixed lens group. The second lens group is a zoom lens group and slides along an optical axis on an image side of the first lens group. The third lens group is a compensation lens group and slides along the optical axis on an image side of the second lens group. In addition, the zoom lens may further include a fixed fourth lens group located on an image side of the third lens group.