Six-Lens Camera Group Minimizing Distortion
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Solution Overview
Problem
Current wide-angle camera lens assemblies for mobile devices suffer from significant perspective distortion and image quality issues, despite advancements in dual, triple, and quad-camera setups combined with image processing algorithms.
Innovation Solution
A camera lens group comprising six lenses, carefully configured with specific refractive powers, surface curvatures, and thicknesses, including aspheric surfaces, to minimize distortion and enhance image quality, achieving a maximum distortion of less than 3.50% and a wide field-of-view while maintaining a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a wide-angle lens assembly with short focal length is used to capture larger scene area, then the viewing angle and coverage area are improved, but perspective distortion becomes significantly worse
Solution Approach 1:
The lens assembly is divided into multiple lens groups (first through sixth lens groups) with different optical functions. The first lens group with negative refractive power handles wide-angle field of view, while subsequent groups with positive and alternating refractive powers correct distortion and focus light, separating the functions of wide-angle capture and distortion correction into distinct segments
Solution Approach 2:
The patent employs aspheric surfaces on multiple lens elements, changing the geometric parameter from spherical to aspheric geometry. This parameter change enables better control of light rays across the wide field of view, reducing perspective distortion while maintaining large scene coverage area
2Manufacturing precision
If multiple lenses are added to reduce distortion and improve image quality, then image fidelity is improved, but device complexity increases
Solution Approach 1:
Multiple lens groups are merged into a single integrated lens assembly with unified optical axis and coordinated optical powers. The first through sixth lens groups work together as one system, combining their individual functions to achieve distortion correction and high image quality without requiring separate correction modules
Solution Approach 2:
The patent utilizes aspheric surfaces on multiple lens elements instead of simple spherical surfaces. This curvature variation allows each lens element to contribute to both image formation and distortion correction, improving image quality while managing the complexity through geometric optimization rather than adding more elements
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 effectively reduces distortion and improves image quality, providing a wide-angle view with high image fidelity and compactness, suitable for portable electronic devices.
Implementation Method 1
a first lens having negative refractive power, a concave object-side surface and a concave image-side surface; a second lens having refractive power, a convex object-side surface and a concave image-side surface; a third lens having positive refractive power, a convex object-side surface and a convex image-side surface
Data Source
AI summary
A camera lens group including, sequentially from an object side to an image side along an optical axis, a first lens having negative refractive power, a concave object-side surface and a concave image-side surface; a second lens having refractive power, a convex object-side surface and a concave image-side surface; a third lens having positive refractive power, a convex object-side surface and a convex image-side surface; a fourth lens having refractive power; a fifth lens having positive refractive power and a convex image-side surface; and a sixth lens having negative refractive power, a convex object-side surface and a concave image-side surface. Half of a field-of-view Semi-FOV of the camera lens group and half of a diagonal length ImgH of an effective pixel area on an imaging plane satisfy: 10.00 mm<tan2(Semi-FOV)*ImgH<23.50 mm. A maximum distortion of the camera lens group is less than 3.50%.