Eight-Lens Zoom Optical System for Aberration-Balanced Imaging
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Solution Overview
Problem
Existing optical systems with zooming capability suffer from poor imaging quality and fail to meet the increased consumer demands for focal length coverage.
Innovation Solution
An optical system comprising eight lenses with specific refractive powers and configurations, where the first and second lens groups are fixed relative to the imaging plane, and the second and third lens groups move along the optical axis to achieve zooming, maintaining a fixed total length and distributing refractive power evenly among the lenses to reduce aberrations and improve imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the optical system uses more lenses to improve imaging quality, then the imaging quality improves, but the device complexity and total length increase
Solution Approach 1:
The optical system divides eight lenses into three lens groups (first lens group with lenses 1-2, second lens group with lenses 3-5, third lens group with lenses 6-8) that can move relative to each other. This segmentation enables zooming functionality while maintaining manageable complexity through modular design, where each group has a specific refractive power configuration to balance aberrations.
Solution Approach 2:
Each lens is assigned a specific refractive power (positive or negative) and surface shape configuration to optimize its local function. The lenses are not identical but have differentiated properties - for example, the first lens has positive refractive power with a convex object side surface, while the second lens has negative refractive power. This local differentiation allows the system to achieve high imaging quality through balanced aberration correction across multiple lenses without requiring excessive total lens count.
2Adaptability or versatility
If the optical system increases zooming capability by adding more lenses, then the focal length coverage improves, but the total length of the optical system increases
Solution Approach 1:
The optical system implements zooming capability through dynamic movement of the second lens group and third lens group along the optical axis between the first lens group and the imaging plane. This dynamic configuration allows the system to achieve variable focal lengths and broad focal length coverage without increasing the fixed total length of the optical system, as the moving groups adjust their positions to change the optical path length.
3Manufacturing precision
If a single lens group contains too many lenses to achieve clear imaging, then the imaging quality improves, but the momentum and power required by the motor during zooming increases
Solution Approach 1:
The optical system segments the eight lenses into three separate lens groups with distinct functions and refractive power configurations. The first lens group (lenses 1-2) has negative refractive power, the second lens group (lenses 3-5) has positive refractive power, and the third lens group (lenses 6-8) has negative refractive power. This segmentation distributes the imaging burden across multiple groups, allowing each group to contain a manageable number of lenses while collectively achieving clear imaging with balanced aberrations.
Solution Approach 2:
Each lens group is assigned a specific refractive power parameter (negative for first and third groups, positive for second group) to optimize the balance between imaging quality and motor power requirements. This parameter optimization ensures that the distribution of refractive power across the eight lenses reduces the workload on individual lenses and minimizes the momentum and power required by the motor during zooming operations.
4Manufacturing precision
If lenses have excessive bending capability to achieve clear imaging, then the imaging quality improves, but the tolerance sensitivity increases
Solution Approach 1:
The optical system optimizes the refractive power parameters of all eight lenses to achieve a balanced distribution of light refraction workload. Each lens has a specifically designed refractive power (positive or negative) that prevents excessive bending capability in any single lens. This parameter optimization reduces tolerance sensitivity while maintaining clear imaging quality through the collective action of all eight lenses with balanced refraction duties.
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 system achieves high imaging quality with fast response and miniaturization by balancing aberrations, reducing lens bending, and optimizing lens groups to enhance focal length coverage and zooming efficiency.
Implementation Method 1
The eight lenses with refractive power evenly distribute the burden of light refraction to each lens, thereby reducing the workload of a single lens for bending light
Data Source
AI summary
An optical system consists of eight lenses with refractive power. From an object side to an image side along an optical axis of the optical system, the eight lenses sequentially include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. The first lens and the second lens form a first lens group with negative refractive power. The third lens to the fifth lens form a second lens group with positive refractive power. The sixth lens to the eighth lens form a third lens group having negative refractive power. The first lens group is fixed relative to an imaging plane of the optical system. Each of the second lens group and the third lens group can move along the optical axis between the first lens group and the imaging plane to realize zooming.