Six-Element Lens Assembly with Inflection Point for Aberration Control
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Solution Overview
Problem
Conventional compact optical systems for electronic devices, such as smartphones and tablets, face challenges in achieving high image quality due to uneven refractive power distribution, leading to excessive aberration, astigmatism, and distortion, particularly in the peripheral regions, which existing six-element lens structures cannot adequately address.
Innovation Solution
A photographing optical lens assembly comprising six non-cemented lens elements with specific refractive powers and surface designs, including aspheric surfaces, is proposed. The assembly features a first lens with positive refractive power, a second lens with refractive power, a third lens with positive refractive power, a fourth lens with negative refractive power, a fifth lens with positive refractive power and aspheric surfaces, and a sixth lens with positive refractive power and an inflection point, ensuring even refractive power distribution and reducing aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional five-element lens structure is used, then the device complexity is low, but the image quality and resolution are insufficient
Solution Approach 1:
The lens system is divided into six separate lens elements with different refractive powers and surface characteristics. Each lens element is optimized for specific aberration correction, allowing the system to achieve high image quality while maintaining manageable complexity through modular design
Solution Approach 2:
Different lens elements are assigned specific local functions: the first lens corrects spherical aberration, the second lens controls coma, the third lens corrects astigmatism, the fourth lens controls distortion, the fifth lens optimizes field curvature, and the sixth lens balances the optical path. This localized optimization of quality characteristics resolves the contradiction between simplicity and image quality
2Manufacturing precision
If a conventional six-element lens structure is used, then the resolution is enhanced, but the refractive power is unevenly distributed causing excessive aberration
Solution Approach 1:
The patent optimizes the refractive power parameters of each lens element, assigning specific refractive power values to each element. The first lens has positive refractive power for spherical aberration correction, the second lens has negative refractive power for coma control, the third lens has positive refractive power for astigmatism correction, the fourth lens has negative refractive power for distortion control, the fifth lens has positive refractive power for field curvature optimization, and the sixth lens has positive refractive power for optical path balancing. This parameter optimization ensures even refractive power distribution and minimizes aberrations
Solution Approach 2:
The lens system employs a composite design combining different lens materials with varying refractive indices and dispersion characteristics. Each lens element is made from materials specifically selected to correct particular aberrations, creating a composite optical system that achieves high resolution while controlling harmful optical effects
3Adaptability or versatility
If lens elements close to the image side have overloaded refractive power, then the field of view is limited, but excessive astigmatism and distortion occur in off-axis region
Solution Approach 1:
The optical system is segmented into multiple lens elements distributed along the optical path, with each element responsible for specific aberration correction. This segmentation prevents any single element from being overloaded, allowing the system to maintain a wide field of view while controlling astigmatism and distortion in off-axis regions through distributed optical power
Solution Approach 2:
The patent introduces intermediate lens elements (specifically the second and fourth lenses with negative refractive power) that act as mediators between the object-side and image-side lens elements. These intermediate elements balance the optical power distribution and correct off-axis aberrations, enabling the system to achieve both wide field of view and high image quality across the entire field
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 effectively corrects aberrations, reduces astigmatism and distortion, and enhances image quality across the entire image field by distributing refractive power evenly, avoiding overloading on single lens elements and maintaining a compact design suitable for electronic devices.
Implementation Method 1
The first lens element with positive refractive power, a second lens element with refractive power, a third lens element with positive refractive power, a fourth lens element with refractive power, a fifth lens element with positive refractive power, and a sixth lens element with positive refractive power
Data Source
AI summary
A photographing optical lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The first lens element with positive refractive power has an object-side surface being convex in a paraxial region. The second lens element has refractive power. The third lens element has positive refractive power. The fourth lens element has refractive power. The fifth lens element with positive refractive power has an object-side surface being convex in a paraxial region and an image-side surface being convex in a paraxial region. The sixth lens element with positive refractive power has an object-side surface being convex in a paraxial region and an image-side surface being concave in a paraxial region, and the image-side surface thereof has at least one inflection point.