Wide-Angle Lens Aberration Correction via Aspherical Segmentation
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Solution Overview
Problem
Existing image lenses fail to meet the requirements of high resolution and small size, resulting in poor imaging effects due to limitations in spherical aberration, field curvature, and distortion, especially when paired with smaller image sensors.
Innovation Solution
A wide-angle image lens design comprising multiple lenses with specific refractive powers and aspherical surfaces, along with an IR-cut filter and aperture stop, that satisfies specific formulas to minimize aberrations and maintain a compact size, ensuring high image quality across different states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the image sensor size is decreased, then the device can be made smaller and more compact, but the imaging quality deteriorates due to increased spherical aberration, field curvature, and distortion
Solution Approach 1:
The lens is divided into multiple lens units (first lens unit with positive refractive power, second lens unit with negative refractive power, third lens unit with positive refractive power) arranged in sequence. This segmentation allows each lens unit to contribute to correcting specific aberrations while maintaining a compact overall structure, resolving the contradiction between small size and high imaging quality.
Solution Approach 2:
The patent employs aspherical surfaces for the first, second, and third lens units instead of traditional spherical surfaces. The aspherical curvature is specifically designed to reduce spherical aberration and field curvature, enabling high imaging quality in a compact lens configuration. The aspherical shape allows for better light ray control across the lens aperture.
2Manufacturing precision
If multiple lens units are added to improve imaging quality, then spherical aberration and distortion are reduced, but the lens becomes more complex and larger
Solution Approach 1:
Each lens unit is designed with specific local optical properties: the first lens unit has positive refractive power for converging light, the second lens unit has negative refractive power for diverging light to correct aberrations, and the third lens unit has positive refractive power for final focusing. This localized optimization of optical properties achieves high imaging quality without requiring excessive numbers of lens units, thus controlling structural complexity.
Solution Approach 2:
The patent optimizes specific parameters including the refractive indices and aspherical coefficients of each lens unit. By carefully selecting and adjusting these parameters, the lens achieves excellent aberration correction with only three lens units, avoiding the need for more complex multi-element designs while maintaining high imaging 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 design achieves reduced spherical aberration, field curvature, and distortion, maintaining high image resolution and small size, effectively addressing the limitations of existing lenses by optimizing the distribution of refractive power and surface curvatures.
Implementation Method 1
a first lens L1 with positive refraction power, a second lens L2 with negative refraction power, a third lens L3 with positive refraction power
Data Source
AI summary
A wide-angle image lens, in the order from the object side to the image side thereof, includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and an image plane. The wide-angle image lens satisfies the formulas: D/TTL>1.16;D/L>1.17;Z/Y>0, wherein D is the maximum image diameter of the wide-angle image plane; TTL is the total length of the wide-angle image lens; L is a distance from an outmost edge of an image surface of the fifth lens to an optical axis of the wide-angle image lens; Z is a distance from a central point of the objective surface of the fourth lens to an outmost edge of the image surface of the fourth lens, Y is a distance from the outmost edge of the image surface of the fourth lens to the optical axis.