Five-Lens Imaging System Aberration Correction via Power Distribution
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Solution Overview
Problem
Conventional imaging lenses for small cameras face challenges in achieving both miniaturization and satisfactory aberration correction, particularly with increasing resolution demands.
Innovation Solution
The imaging lens configuration includes a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with negative refractive power, and a fifth lens with negative refractive power, arranged from the object side to the image plane side, with specific focal length and curvature radius relationships to balance refractive power and correct aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a five-lens configuration is used to correct aberrations, then aberration correction performance is improved, but the total length of the lens system increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the focal lengths and curvature radii of each lens element. Specifically, it sets the ratio of focal lengths (f1/f2, f3/f4, f2/f5) and curvature radii (R1, R2, R3, R4, R5, R6) within specific ranges to optimize the balance between aberration correction and compact size. This allows the five-lens system to achieve satisfactory aberration correction while keeping the total length relatively short.
2Length of moving object
If the first lens and second lens have strong refractive power to reduce system size, then miniaturization is improved, but aberration correction becomes more difficult
Solution Approach 1:
The patent applies segmentation by dividing the refractive power distribution across five lens elements rather than concentrating it in one or two lenses. The first and second lenses provide strong refractive power for miniaturization, while the third, fourth, and fifth lenses with weaker refractive powers work together to correct the aberrations generated by the stronger lenses. This segmented approach allows simultaneous achievement of compact size and satisfactory aberration correction.
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 allows for effective aberration correction while minimizing the lens system's size, maintaining a certain imaging angle, and reducing sensitivity to production errors, thereby enhancing image-forming performance.
Implementation Method 1
a first lens having positive refractive power; a second lens having negative refractive power; a third lens having positive refractive power; a fourth lens having negative refractive power; and a fifth lens having negative refractive power
Data Source
AI summary
An imaging lens includes a first lens having positive refractive power; a second lens having negative refractive power; a third lens having positive refractive power; a fourth lens having negative refractive power; and a fifth lens having object-side and image plane-side surfaces thereof being aspheric, arranged in this order from an object side to an image plane side. The first lens has a shape so that a curvature radius of a surface thereof on the object side is positive. The fifth lens has a shape so that a curvature radius of the surface thereof on the object side and a curvature radius of the surface thereof on the image plane side are positive. The second lens, the third lens, and the fourth lens are arranged so that a specific conditional expression is satisfied.