Aspheric Camera Lens Group Correcting Wide-Angle Aberrations
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional camera lenses with large fields of view face challenges in achieving both miniaturization and high imaging quality due to contradictory requirements of size and light transmission, often resulting in significant aberration and distortion.
Innovation Solution
A camera lens group comprising five lenses with specific refractive powers and aspheric surfaces in non-rotational symmetry, optimized with carefully controlled focal lengths, curvature radii, and spacing distances to correct off-axis aberrations and enhance imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the field of view is increased to shoot wider scenes, then the lens can capture more scene, but the imaging quality deteriorates due to large aberration and distortion
Solution Approach 1:
The lens system is divided into five distinct lens groups with different refractive powers and surface characteristics. Each lens group targets specific aberration corrections, allowing the system to maintain high imaging quality across the ultra-wide field of view by segmenting the optical correction tasks among multiple specialized components.
Solution Approach 2:
The patent employs aspheric surfaces with non-rotational symmetry on multiple lenses, particularly the fourth lens which has different curvature radii in the radial and tangential directions. This asymmetric surface design enables independent correction of meridian and sagittal aberrations, significantly improving imaging quality across the wide field of view where symmetric surfaces would fail.
2Volume of moving object
If the lens size is reduced for miniaturization, then the lens becomes more compact, but the amount of light passing through is reduced
Solution Approach 1:
The patent utilizes aspheric surfaces instead of traditional spherical surfaces on multiple lenses. These curved surfaces with varying radii of curvature optimize light path control, allowing more light to be directed efficiently through the compact lens structure onto the image sensor, thereby maintaining high light transmission in a miniaturized form factor.
Solution Approach 2:
The patent optimizes multiple parameters including the curvature radii of aspheric surfaces, spacing distances between lenses, and refractive indices of lens materials. By carefully adjusting these parameters, the system achieves maximum light transmission efficiency within a compact size constraint, ensuring sufficient illumination on the image sensor despite the reduced overall lens volume.
3Device complexity
If conventional spherical surfaces are used, then the lens structure is simple, but off-axis aberration and distortion are large
Solution Approach 1:
The patent introduces aspheric surfaces with non-rotational symmetry on the first, third, and fourth lenses. These asymmetric surfaces provide additional degrees of freedom for aberration correction, enabling the system to control off-axis aberrations and distortion effectively. The asymmetric profiles allow independent optimization of meridian and sagittal focal surfaces, achieving superior imaging quality across the wide field of view.
Solution Approach 2:
Instead of using a single complex lens element, the patent segments the aberration correction function across five lenses, with aspheric surfaces strategically placed on specific lenses. This segmentation allows each aspheric surface to target specific aberration types, distributing the correction complexity across multiple simpler components rather than requiring one highly complex element.
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 enables a compact, ultra-wide-angle lens with improved imaging quality by effectively correcting meridian and sagittal aberrations, achieving a larger field of view while maintaining high resolution and reducing aberrations.
Implementation Method 1
a first lens with a refractive power, a second lens with a negative refractive power, a third lens with a positive refractive power, a fourth lens with a positive refractive power, and a fifth lens with a negative refractive power
Data Source
AI summary
The disclosure provides a camera lens group, sequentially including, from an object side to an image side along an optical axis: a first lens with a refractive power, a second lens with a negative refractive power and an image-side surface thereof being concave, a third lens with a positive refractive power, a fourth lens with a positive refractive power and an image-side surface thereof being convex, and a fifth lens with a negative refractive power, wherein an air space is provided between any two adjacent lenses from the first lens to the fifth lens, and at least one lens from the first lens to the fifth lens is provided with an aspheric surface which is in non-rotational symmetry. An effective focal length fx, in an X-axis direction and an effective focal length fy, in a Y-axis direction, of the camera lens group satisfy 0.90<fx/fy<1.25.