Five-Lens Optical System Aberration Control
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Solution Overview
Problem
Conventional wide-angle image capturing modules with five lens elements face challenges in reducing volume while maintaining image quality due to improper arrangement of lens spacing and refractive power.
Innovation Solution
An optical image capturing system with five lens elements, including a first lens with negative refractive power, a second lens with positive refractive power, a third lens with positive refractive power, a fourth lens with negative refractive power, and a fifth lens with negative refractive power, where specific conditions on axial distances, Abbe numbers, and focal lengths are met to optimize lens arrangement and correct aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional lens arrangement with five lens elements is used, then image capturing function is provided, but volume cannot be reduced while maintaining image quality
Solution Approach 1:
The patent applies parameter changes by optimizing the axial distances between lens elements (T12, T23, T34, T45) and adjusting the refractive powers of individual lenses according to specific mathematical conditions. This systematic parameter optimization enables compact volume reduction while preserving image quality through precise control of optical path length and focal characteristics.
Solution Approach 2:
The patent employs composite material principles by combining lens elements with different refractive indices and Abbe numbers in a specific configuration. The first lens has negative refractive power with specific Abbe number range, while subsequent lenses have positive refractive power, creating a composite optical system that achieves both compactness and high image quality through material property optimization.
2Device complexity
If lens spacing and refractive power are not properly arranged, then simple structure is maintained, but volume cannot be reduced while maintaining image quality
Solution Approach 1:
The patent applies dynamics by establishing flexible mathematical relationships between axial distances and focal lengths that allow for optimized spacing. The conditions on T12/T45 ratios and focal length combinations enable dynamic adjustment of lens positions to achieve compact volume while maintaining proper optical performance, rather than using fixed conventional spacing.
3Ease of manufacture
If conventional lens arrangement is used, then manufacturing is simple, but aberrations are not properly corrected
Solution Approach 1:
The patent applies local quality by assigning specific optical characteristics to individual lens elements at specific positions. The first lens is designed with negative refractive power and specific Abbe number range to control chromatic aberration locally, while subsequent lenses with positive refractive power are positioned to correct spherical aberration, achieving precise aberration correction through localized optical 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 system achieves a compact design with improved image quality by adjusting lens spacing and refractive power ratios, correcting aberrations and reducing chromatic and spherical aberrations, thereby enhancing the field of view and image sharpness.
Implementation Method 1
five lens elements having, in order from an object side to an image side: a first lens element; a second lens element having positive refractive power; a third lens element having positive refractive power; a fourth lens element; and a fifth lens element
Data Source
AI summary
An optical image capturing system includes five lens elements, the five lens elements being, in order from an object side to an image side: a first lens element; a second lens element having positive refractive power; a third lens element having positive refractive power; a fourth lens element; and a fifth lens element having an image-side surface being concave in a paraxial region thereof and at least one convex critical point in an off-axis region of the image-side surface thereof.