Three-Lens Imaging System Aberration Correction
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Solution Overview
Problem
Current imaging lenses for digital and portable cameras face challenges in achieving high performance while maintaining compactness and cost-effectiveness, particularly with the increasing demand for higher pixel counts and miniaturization, where existing configurations with three or four lenses using aspheric surfaces are insufficient in achieving both imaging performance and compactness.
Innovation Solution
A three-lens configuration with specific refractive power distributions and aspherical surfaces, where the first lens has positive power, the second lens has negative power with a concave surface, and the third lens has a meniscus shape with optimized focal lengths and Abbe numbers, satisfying conditional expressions to correct aberrations and ensure miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If three or four lenses are used with aspheric surfaces to enhance performance, then imaging performance is improved, but manufacturing cost increases and ease of manufacture deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive powers and focal lengths of the three lenses through conditional expressions (0.3 < f2/f < 1.2 and 0.5 < f3/f < 1.5), and by optimizing the aspheric surface parameters (coefficients A4, A6, A8, A10) to achieve high imaging performance while maintaining manufacturability through standardized design parameters
2Manufacturing precision
If three or four lenses are used to enhance performance, then imaging performance is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple functions into a compact three-lens system where each lens performs multiple optical corrections simultaneously. The first lens (positive power) corrects spherical aberration and field curvature, the second lens (negative power) corrects chromatic aberration and distortion, and the third lens (positive power) fine-tunes focal accuracy and resolves chromatic aberration, achieving comprehensive aberration correction with minimal components
Solution Approach 2:
The patent employs aspheric surfaces on all six lens surfaces to replace traditional spherical surfaces, enabling more efficient correction of optical aberrations. The aspheric coefficients are optimized to achieve superior imaging performance while maintaining a compact form factor, reducing the need for additional corrective lenses
3Manufacturing precision
If a four-lens configuration is adopted to enhance performance, then imaging performance is improved, but compactness deteriorates
Solution Approach 1:
The patent achieves compactness through optimized parameter selection, specifically controlling the focal lengths and refractive powers of the three lenses to satisfy conditional expressions that minimize overall length while maintaining high imaging performance. The aspheric surface parameters are also optimized to reduce lens curvature radii, enabling a more compact design
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 results in a compact imaging lens with high aberration performance, effective correction of chromatic and field curvature aberrations, and sufficient back focus, while maintaining a short overall length, thus addressing the demands for higher performance and miniaturization.
Implementation Method 1
each of the first lens, the second lens and the third lens having at least one aspherical surface
Implementation Method 2
a first lens having a positive refractive power, a second lens having a negative refractive power, and a third lens having a positive refractive power
Data Source
AI summary
An imaging lens is provided and includes: in order from an object side of the imaging lens, an aperture diaphragm; a first lens having a positive refractive power and having a convex surface on the object side; a second lens having a negative refractive power and having a concave surface on the object side; and a third lens having a meniscus shape having a convex surface on the object side in the vicinity of an optical axis thereof, each of the first lens, the second lens and the third lens having at least one aspherical surface, and the imaging lens satisfying the following conditional expressions.0.9<|f2/f|<11 (1)1.2<|f3/f|<100 (2)f represents a focal length of the imaging lens; f2 represents a focal length of the second lens; and f3 represents a focal length of the third lens.