Wide-Angle Lens Assembly Aberration Correction
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Solution Overview
Problem
Current wide-angle lens assemblies fail to simultaneously achieve miniaturization, a large field of view, and high resolution while maintaining good optical performance.
Innovation Solution
A wide-angle lens assembly design comprising specific configurations of lenses with varying refractive powers and surface curvatures, including a stop placement, to optimize focal lengths, field of view, and optical axis alignment, ensuring conditions such as 0.15 < BFL/TTL < 0.25 and -1.5 < f5/f1 ≤ -0.77 are met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the lens assembly is miniaturized to reduce total lens length, then the device size is reduced, but the field of view and resolution deteriorate
Solution Approach 1:
The lens assembly is divided into six distinct lens elements with alternating positive and negative refractive powers. Each lens element is optimized for specific functions: the first lens (negative power) expands the field of view, while subsequent lenses (positive and negative alternating) correct aberrations and focus light. This segmentation allows the compact design to achieve both miniaturization and large field of view by distributing optical functions across multiple specialized elements rather than relying on a single complex element.
Solution Approach 2:
The patent employs precise control of optical parameters including refractive indices (Nd ranging from 1.517 to 1.690), Abbe numbers (Vd ranging from 52.75 to 64.17), and curvature radii (R values from -12.000 to 10.000 mm). By optimizing these parameters within specific ranges, the compact lens assembly achieves high resolution and large field of view despite the reduced total length. The conditional expressions (e.g., -1.55 ≤ f5/f1 ≤ -0.77, 0.15 < BFL/TTL < 0.25) define the parameter space that resolves the contradiction between size and optical performance.
2Length of moving object
If the lens assembly is miniaturized to reduce total lens length, then the device size is reduced, but the resolution deteriorates
Solution Approach 1:
The six-lens segmented structure enables resolution optimization through specialized elements. The third lens (positive power with convex object-side surface) and fifth lens (positive power with convex image-side surface) are specifically designed to enhance focal precision and image sharpness. The negative power lenses (first, fourth, and sixth) correct chromatic and spherical aberrations that would otherwise degrade resolution. This functional segmentation maintains high resolution in the miniaturized design.
Solution Approach 2:
Precise parameter optimization within conditional ranges ensures high resolution despite miniaturization. The refractive indices (Nd: 1.517-1.690) and Abbe numbers (Vd: 52.75-64.17) are selected to minimize chromatic aberration. Curvature radii are controlled within specific ranges (e.g., R31 from -12.000 to 10.000 mm) to optimize focal precision. The conditional expression 0.15 < BFL/TTL < 0.25 ensures the back focal length maintains appropriate proportion to total length, preserving resolution capability in the compact form factor.
3Adaptability or versatility
If the lens configuration is optimized for large field of view, then the field of view increases, but the optical performance (aberration correction) deteriorates
Solution Approach 1:
The alternating positive-negative lens structure distributes optical correction functions across six elements. The first lens (negative power) is optimized for wide field of view capture, while the second lens (positive power) and subsequent elements systematically correct the aberrations introduced by the wide-angle design. The fourth and sixth lenses (negative power) provide additional aberration correction, particularly for off-axis rays. This segmented approach allows simultaneous optimization for both large field of view and aberration correction.
Solution Approach 2:
The patent defines specific parameter ranges that resolve the field of view versus aberration correction trade-off. The refractive indices (Nd: 1.517-1.690) and Abbe numbers (Vd: 52.75-64.17) are selected to balance wide-angle performance with chromatic aberration control. The conditional expression -1.55 ≤ f5/f1 ≤ -0.77 optimizes the ratio between the fifth and first lens focal lengths to maintain aberration correction across the wide field. Curvature radii parameters (R31, R32, R41, R42) are controlled within ranges that ensure distortion remains below 5% while maintaining half field of view between 40-70 degrees.
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 design achieves a shortened total lens length, increased field of view, enhanced resolution, and corrected aberrations, as demonstrated by specific optical specifications and diagrams showing improved longitudinal aberration, field curvature, and distortion performance.
Implementation Method 1
The first lens is with negative refractive power and includes a convex surface facing the object side and a concave surface facing the image side. The second lens is with positive refractive power. The third lens is with positive refractive power and includes a convex surface facing the object side. The fourth lens is with negative refractive power. The fifth lens is with positive refractive power and includes a convex surface facing the image side. The sixth lens is with negative refractive power.
Data Source
AI summary
A wide-angle lens assembly includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens is with negative refractive power and includes a convex surface facing an object side and a concave surface facing an image side. The second lens is with positive refractive power. The third lens is with positive refractive power and includes a convex surface facing the object side. The fourth lens is with negative refractive power. The fifth lens is with positive refractive power and includes a convex surface facing the image side. The sixth lens is with negative refractive power. The wide-angle lens assembly satisfies: −1.5<f5/f≤−0.77, wherein f1 is an effective focal length of the first lens and f5 is an effective focal length of the fifth lens.