Eight-Lens Optical Imaging Group for Ultra-Wide Angle Distortion Control
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Solution Overview
Problem
Existing ultra-wide-angle lens assemblies for smartphones suffer from significant linear distortion, which requires users to correct in software, thereby affecting image quality.
Innovation Solution
An optical imaging lens group comprising eight lenses, with specific refractive powers and surface types, is designed to minimize distortion while maintaining a wide field of view and high imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If an ultra-wide-angle lens assembly is used to achieve a wide field of view, then the field of view is widened, but linear distortion increases
Solution Approach 1:
The lens assembly is divided into multiple lens elements (at least six lenses including positive and negative power lenses) rather than using a single lens. This segmentation allows each element to contribute differently to the overall optical function, enabling the system to achieve wide field of view while controlling distortion through the combined effect of multiple elements with different optical properties
Solution Approach 2:
Different lens elements are assigned different optical powers (positive and negative) and positioned at different locations within the assembly. The positive power lenses contribute to converging light and achieving wide angle, while negative power lenses are strategically placed to counteract distortion effects. Each element has optimized local optical properties to address specific aspects of the overall performance requirement
2Manufacturing precision
If multiple lenses are added to reduce distortion, then distortion is reduced, but device complexity increases
Solution Approach 1:
Multiple lens elements are combined into a single integrated lens assembly that functions as one optical unit. The patent integrates positive and negative power lenses, aperture stop, and other components into a cohesive structure that achieves distortion control without requiring separate correction mechanisms. This merging approach reduces overall system complexity compared to using multiple independent components
Solution Approach 2:
The lens assembly is designed to simultaneously achieve multiple functions: providing wide field of view, controlling linear distortion, and maintaining compact form factor. The same set of lens elements that creates the ultra-wide angle also inherently provides distortion correction through their combined optical effect, eliminating the need for separate distortion correction 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 lens group achieves a minimal optical distortion of ≤5.1% and a wide field of view (>60°), resulting in improved imaging quality and reduced post-processing correction needs.
Implementation Method 1
an optical imaging lens group includes a first lens to an eighth lens... each lens having refractive power
Data Source
AI summary
An optical imaging lens group is disclosed. An implementation of the optical imaging lens group includes, sequentially along an optical axis from an object side to an image side: first to eighth lenses having refractive powers. The object-side surface of the first lens is a concave surface. The image-side surface of the third lens is a concave surface. Half of a maximal field-of-view Semi-FOV of an optical imaging system satisfies: Semi-FOV>60°, and an optical distortion Dist. of the optical imaging system satisfies: |Dist.|≤5.1%.