Camera Lens Assembly with Asymmetric Aspheric Surfaces
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current camera lens assemblies for mobile devices face challenges in achieving high image quality with wide field-of-view while minimizing TV distortion, as rotationally symmetric aspheric surfaces are insufficient in correcting off-axis aberrations and distortion.
Innovation Solution
A camera lens assembly comprising six lenses with specific refractive power distributions and non-rotationally symmetric aspheric surfaces, where at least one lens has a non-rotationally symmetric aspheric surface to correct off-axis meridian and sagittal aberrations, reducing TV distortion and improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If rotationally symmetric aspheric surfaces are used in wide-angle lens assemblies, then the lens structure is simple and easy to manufacture, but off-axis aberrations and TV distortion cannot be well corrected
Solution Approach 1:
The patent applies non-rotationally symmetric aspheric surfaces to lens surfaces, specifically using different conic constants and aspheric coefficients for meridional and sagittal directions. This asymmetric surface design enables independent correction of off-axis aberrations in different planes, achieving superior distortion correction (TV distortion ≤2.5%) and off-axis image quality while maintaining manufacturability through standardized non-rotationally symmetric manufacturing processes.
2Area of stationary object
If the field-of-view angle is increased to achieve wide-angle imaging, then more scene can be captured, but TV distortion of the captured image becomes more serious
Solution Approach 1:
The patent employs non-rotationally symmetric aspheric surfaces with direction-dependent conic constants (Kx, Ky) and aspheric coefficients (Ax, Ay) to independently control meridional and sagittal ray paths. This asymmetric surface design enables effective correction of TV distortion across wide field-of-view angles, achieving comprehensive distortion control (TV distortion ≤2.5%) while maintaining extensive scene coverage.
3Device complexity
If rotationally symmetric aspheric surfaces are used, then the lens design is straightforward, but the freedom to correct off-axis aberrations is insufficient
Solution Approach 1:
The patent implements non-rotationally symmetric aspheric surfaces that provide independent control over meridional and sagittal aberrations through separate conic constants and aspheric coefficients for each direction. This asymmetric approach doubles the design freedom compared to rotationally symmetric surfaces, enabling simultaneous correction of coma, astigmatism, and distortion while maintaining manageable design complexity through systematic optimization methods.
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 TV distortion to ≤2.5% and enhances image quality by correcting aberrations, achieving a wide angle with small distortion and high imaging plane brightness.
Implementation Method 1
A camera lens assembly includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, which all have refractive power and are sequentially arranged from an object side to an image side along an optical axis
Data Source
AI summary
The present disclosure discloses a camera lens assembly. The camera lens assembly includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, which all have refractive power and are sequentially arranged from an object side to an image side along an optical axis. The first lens and the sixth lens have negative refractive power; the third lens and the fifth lens have positive refractive power; at least one of the first lens to the sixth lens has a non-rotationally symmetric aspheric surface; wherein tan(FOVx/2)*tan(FOVy/2)<2.0, where FOVx is a full field-of-view of the camera lens assembly in an X-axis direction and FOVy is a full field-of-view of the camera lens assembly in a Y-axis direction, and values of FOVx and FOVy are different.