Imaging Lens Aberration Correction via Asymmetric Refractive Power
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Solution Overview
Problem
Existing imaging lens systems with 4 pieces of lenses often compromise on optical and aberration properties, failing to achieve satisfactory high resolution and compactness.
Innovation Solution
A 4-lens imaging system configuration with specific refractive power and shape arrangements, including a first lens with positive refractive power and a meniscus shape, a second lens with negative refractive power and concave shape, a third lens with positive refractive power and convex shape, and a fourth lens with negative refractive power and meniscus shape, meeting specific conditional expressions for refractive and focal distances, and curvature ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a 4-piece lens system is used to achieve compactness and low cost, then the device size and manufacturing cost are reduced, but the optical properties and aberration correction become insufficient
Solution Approach 1:
The patent applies local quality by giving each lens element specific asymmetric shapes (meniscus, concave, convex) and assigning different refractive power distributions (positive at center, negative at ambience) to optimize local optical performance. This allows the 4-piece system to achieve high-resolution imaging and aberration correction despite the limited number of elements.
2Manufacturing precision
If lens elements are arranged to achieve high resolution, then the imaging quality is improved, but the overall lens length increases
Solution Approach 1:
The patent employs dynamic optical design by implementing variable refractive power distribution within each lens element (positive at center, negative at ambience). This dynamic power distribution allows the lens system to maintain high imaging resolution while compressing the overall optical path length, achieving a super-slim profile.
3Length of moving object
If the lens system is made super-slim, then the device compactness is improved, but the aberration correction becomes more difficult
Solution Approach 1:
The patent utilizes parameter changes by varying the refractive power distribution within each lens element (positive at center, negative at ambience) and optimizing the conditional expressions for focal lengths and curvatures. These parameter optimizations enable effective aberration correction in a super-slim lens configuration.
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
This configuration enables a super-slim imaging lens with high resolution, effectively correcting aberrations and maintaining excellent lens characteristics.
Implementation Method 1
a first lens having a positive (+) refractive power
Implementation Method 2
a second lens having a negative (−) refractive power
Implementation Method 3
a third lens having a positive (+) refractive power
Implementation Method 4
a fourth lens having a negative (−) refractive power
Data Source
AI summary
The present invention relates to an imaging lens, the imaging lens including, in an ordered way from an object side, a first lens having a positive (+) refractive power, a second lens having a negative (−) refractive power, a third lens having a positive (+) refractive power, and a fourth lens having a negative (−) refractive power and having a negative (−) refractive power from a lens center to a lens ambience.