Zoom Lens System Compact Design Aberration Control
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Solution Overview
Problem
Current zoom lens systems are costly and large, failing to provide optimal image quality for compact portable electronic devices, which require a more compact and cost-effective solution.
Innovation Solution
A zoom lens system comprising four lens groups with specific optical powers and configurations, including unbound lenses, biconvex and biconcave lenses, and a plastic lens with aspheric surfaces, where the second and third lens groups move during zooming while the first lens group and aperture stop remain fixed, satisfying the condition Y×L2×fW×fT≤1.06.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a conventional zoom lens system is used, then the image quality is acceptable, but the size and cost are too large
Solution Approach 1:
The zoom lens system is divided into four distinct lens groups with specific optical powers (first lens group with positive power, second lens group with negative power, third lens group with positive power, fourth lens group with positive power). Each group contains specific lens configurations (unbound lenses, biconvex lenses, biconcave lenses, aspheric lenses) that work together to achieve compact size while maintaining image quality through segmented optical design
Solution Approach 2:
The patent implements dynamic movement of lens groups during zooming operations. Specifically, the second lens group moves toward the image side and the third lens group moves toward the object side when zooming, while the first lens group and aperture stop remain fixed. This dynamic configuration allows the system to achieve variable focal lengths in a compact form factor
2Volume of moving object
If the lens system is made more compact, then the size is reduced, but the cost and image quality deteriorate
Solution Approach 1:
Different lens groups are assigned specific local functions and optical characteristics. The first lens group (with unbound lenses) handles specific optical corrections, the second lens group (with concave and convex lenses) provides negative optical power, the third lens group (with adhering biconvex and biconcave lenses) provides positive optical power, and the fourth lens group (with aspheric plastic lens) adds additional correction. This localized optimization of optical properties enables compact design without sacrificing image quality
Solution Approach 2:
The patent employs composite lens designs combining different lens types and materials. Notably, the fourth lens group uses a plastic lens with aspheric surfaces, while other groups use glass lenses with spherical surfaces. This composite approach allows for optimized optical performance in a compact configuration, balancing manufacturing cost with image quality
3Volume of moving object
If the lens system is made more compact, then the size is reduced, but the image quality deteriorates
Solution Approach 1:
The patent utilizes curved lens surfaces including spherical surfaces and aspheric surfaces. The fourth lens group specifically employs an aspheric plastic lens, while other groups use spherical lenses. These curved surfaces are essential for correcting optical aberrations (spherical aberration, distortion, coma) in a compact design, enabling high image quality despite the reduced overall system size
Solution Approach 2:
The aperture stop acts as an intermediary element positioned between the second and third lens groups. It controls the light cone and works in conjunction with the lens groups to optimize optical performance. The fixed position of the aperture stop relative to the moving lens groups provides a stable reference for maintaining precise optical alignment during zooming, thereby preserving image quality
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 reduces the size and cost of the zoom lens system while maintaining high image quality by minimizing ghost images, distortion, spherical aberration, and transverse aberration across various field angles.
Implementation Method 1
a first lens group with positive optical power, a second lens group with negative optical power, a third lens group with positive optical power, and a fourth lens group with positive optical power
Implementation Method 2
The seventh plastic lens has at least one aspheric surface
Data Source
AI summary
A zoom lens system includes a first lens group, a second lens group, a third lens group, a fourth lens group, and an aperture stop, from an object side to an image side on an optical axis. The zoom lens system satisfies the following condition:Y×L2×fW×fT≤1.06where Y is a maximum diagonal length of the image side 170, L is a total track length of the zoom lens system 100, fW is a focal length of the zoom lens system 100 at a wide status, fT is a focal length of the zoom lens system 100 at a telephoto status.