Camera Lens Assembly with Asymmetric Aspheric Surfaces
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Solution Overview
Problem
Current camera lens assemblies in portable electronic devices, such as mobile phones, face challenges in achieving high image quality due to their rotationally symmetric aspheric surfaces, which inadequately correct off-axis aberrations, and require miniaturization while maintaining image quality.
Innovation Solution
A camera lens assembly comprising six lenses with strategically configured refractive powers, surface shapes, and thicknesses, including non-rotationally symmetrical aspheric surfaces, to correct off-axis tangential and sagittal aberrations, achieving a larger field-of-view and improved image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If rotationally symmetric aspheric surfaces are used in the lens assembly, then the manufacturing process is simplified and rotational symmetry is maintained, but off-axis aberrations cannot be corrected effectively
Solution Approach 1:
The patent applies asymmetry by introducing non-rotationally symmetrical aspheric surfaces on at least one lens. These surfaces have different curvature distributions in different directions, allowing independent optimization of tangential and sagittal aberrations. The asymmetric surface profile enables correction of off-axis aberrations that cannot be addressed by rotationally symmetric surfaces, while still maintaining aspheric manufacturing advantages.
Solution Approach 2:
The patent implements local quality by applying non-rotationally symmetrical aspheric surfaces selectively to specific lenses within the multi-lens assembly. This allows different regions of the optical system to have different surface characteristics optimized for their specific functions - some lenses maintain rotational symmetry for simple manufacturing, while others use asymmetric surfaces for aberration correction in critical positions.
2Volume of moving object
If the lens assembly is miniaturized for portable electronic products, then the device size is reduced, but image quality and field-of-view are compromised
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive indices, curvature radii, and thickness parameters of multiple lenses in the assembly. By carefully selecting and adjusting these parameters, the patent achieves compact lens spacing and reduced overall assembly size while maintaining adequate correction of aberrations. The non-rotationally symmetrical aspheric surfaces provide additional parameters for optimization, enabling miniaturization without sacrificing image quality.
3Manufacturing precision
If more lenses are added to correct aberrations, then image quality improves, but the device complexity and size increase
Solution Approach 1:
The patent reduces complexity by using non-rotationally symmetrical aspheric surfaces that provide enhanced aberration correction capability per lens. This asymmetric surface design allows fewer lenses to achieve the same level of correction that would require more lenses with simple spherical or rotationally symmetric aspheric surfaces, thereby reducing overall assembly complexity.
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 miniaturizes the lens assembly, enhances image quality by correcting aberrations, and supports the production of high-quality images with a larger field-of-view, addressing the limitations of existing technologies.
Implementation Method 1
The first lens may have negative refractive power; the second lens may have positive refractive power; the third lens may have negative refractive power; the fourth lens has refractive power; the fifth lens has refractive power; and the sixth lens may have negative refractive power
Data Source
AI summary
The present disclosure discloses a camera lens assembly including, sequentially from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. The first lens has negative refractive power; the second lens has positive refractive power; the third lens has negative refractive power; the fourth lens has refractive power; the fifth lens has refractive power; and the sixth lens has negative refractive power. At least one of the first lens to the sixth lens has a non-rotationally symmetrical aspheric surface. An effective focal length fx in an X-axis direction of the camera lens assembly and an effective focal length fy in a Y-axis direction of the camera lens assembly satisfy 0.5<fx/fy<1.5.