Free-Form Camera Lens Group for Off-Axis Aberration Correction
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Solution Overview
Problem
Existing camera lens assemblies in smart devices, primarily using rotationally symmetric aspheric lenses, struggle to effectively correct off-axis aberrations on the tangential and sagittal image planes, limiting their performance, especially in wide-angle lens applications.
Innovation Solution
Employing a camera lens group with non-rotationally symmetric aspheric surfaces and optimizing optical parameters such as focal lengths, radii of curvature, and lens thicknesses to enhance aberration correction and miniaturization, while incorporating free-form surfaces to improve image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If rotationally symmetric aspheric lenses are used, then manufacturing is easier and device complexity is reduced, but off-axis aberrations on the tangential and sagittal image planes cannot be effectively corrected
Solution Approach 1:
The patent applies free-form surfaces with non-rotationally symmetric aspheric profiles to lens surfaces, enabling independent optimization of tangential and sagittal image planes. This asymmetric design allows effective correction of off-axis aberrations that cannot be corrected by rotationally symmetric lenses, directly resolving the contradiction between manufacturing simplicity and aberration correction precision.
2Manufacturing precision
If free-form surfaces are applied to correct off-axis aberrations, then image quality improves, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies free-form surfaces selectively to specific lens elements (first, third, and fifth lenses) rather than all lenses, optimizing aberration correction where most needed while maintaining simpler rotationally symmetric surfaces in other elements. This localized application reduces overall device complexity while achieving superior image quality.
3Manufacturing precision
If more lenses are added to improve aberration correction, then image quality improves, but total lens length increases
Solution Approach 1:
The patent employs free-form surface parameters (Zernike polynomials or NURBS) to precisely control light ray paths, enabling effective aberration correction with fewer lens elements. By changing from traditional spherical/aspheric parameters to free-form parameters, the system achieves superior correction with a compact 5-lens design, reducing total lens length while maintaining high image quality.
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 proposed lens design effectively reduces total lens length, enhances image quality by minimizing aberrations, and supports wide-angle, high-pixel capabilities suitable for portable electronic devices.
Implementation Method 1
Each of the first to the fifth lenses has refractive power
Data Source
AI summary
The present disclosure discloses a camera lens group 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 and a fifth lens. Each of the first to fifth lenses has refractive power. At least one of the first to the fifth lenses has a non-rotationally symmetric aspheric surface. A maximum effective radius DT11 of an object-side surface of the first lens satisfies: DT11<0.80 mm.