Six-Element Aspheric Lens Aberration Correction
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Solution Overview
Problem
Conventional compact optical systems for portable electronic devices, such as smartphones and tablets, face challenges in achieving high image quality and resolution due to issues with axial distance between lens elements and sensitivity to refractive power distribution, leading to poor image quality and assembly difficulties.
Innovation Solution
A compact imaging lens system comprising six non-cemented lens elements with specific refractive powers and aspheric surfaces, including 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, a fifth lens with positive refractive power, and a sixth lens with negative refractive power, optimized to minimize axial distance and correct aberrations, thereby enhancing image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a four-element or five-element lens structure is used, then the device complexity is reduced, but the image quality and resolution cannot satisfy high-end requirements
Solution Approach 1:
The lens system is divided into six separate non-cemented lens elements with alternating positive and negative refractive powers. This segmentation allows each element to be optimized independently for specific aberration correction while maintaining overall system compactness and high image quality.
Solution Approach 2:
Each lens element is designed with specific local optical properties: the first, third, and fifth elements have positive refractive power for convergence, while the second, fourth, and sixth elements have negative refractive power for divergence. This local differentiation enables precise control of light paths and aberration correction throughout the optical system.
2Ease of operation
If the axial distance between the first lens element and the second lens element is increased, then assembly becomes easier, but the compact size is compromised
Solution Approach 1:
The patent establishes specific parameter relationships: 0.3 < T12/CT1 < 1.5, where T12 is the axial distance between the first and second lens elements and CT1 is the central thickness of the first lens element. This parameter optimization balances compactness with manufacturability, ensuring the system remains compact while maintaining feasible assembly tolerances.
3Device complexity
If most refractive powers are concentrated on the object-side, then the device complexity is reduced, but image quality deteriorates due to high sensitivity of tolerance
Solution Approach 1:
The total refractive power is segmented and distributed across six lens elements rather than concentrated in one or two elements. This distribution reduces the refractive power of each individual element, thereby reducing their sensitivity to manufacturing tolerances and assembly variations while maintaining high overall image quality.
Solution Approach 2:
The refractive power distribution follows a specific pattern: positive, negative, positive, negative, positive, negative from object-side to image-side. This alternating pattern creates a balanced optical system where aberrations introduced by positive elements are corrected by subsequent negative elements, improving robustness against tolerance variations.
4Manufacturing precision
If six-element lens structure is used, then image quality and resolution are enhanced, but the axial distance between lens elements causes assembly problems
Solution Approach 1:
The patent defines optimized parameter ranges for a six-element non-cemented lens system: 0.3 < T12/CT1 < 1.5 for the first gap, 0.5 < T34/CT3 < 1.5 for the third gap, and 0.5 < T56/CT5 < 1.5 for the fifth gap. These parameter constraints ensure that while six elements are used for high image quality, the axial distances remain within manufacturable and assembly-friendly ranges.
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 and maintains a compact size, improving image quality and resolution while simplifying the assembly process, making it suitable for high-end mobile devices with 3D image capturing capabilities.
Implementation Method 1
The imaging lens system includes six non-cemented lens elements with refractive power... both of an object-side surface and an image-side surface of the fifth lens element are aspheric. The sixth lens element with refractive power has a concave image-side surface in a paraxial region thereof, wherein the image-side surface of the sixth lens element has at least one convex shape in an off-axis region thereof, and both of an object-side surface and the image-side surface of the sixth lens element are aspheric.
Data Source
AI summary
An imaging lens system includes six non-cemented lens elements with refractive power, 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 has positive refractive power. 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 has refractive power, wherein both of the surfaces thereof are aspheric. The sixth lens element with refractive power has a concave image-side surface in a paraxial region thereof, wherein the image-side surface has at least one convex shape in an off-axis region thereof, and both of the surfaces thereof are aspheric. The imaging lens system has a total of six lens elements with refractive power.