Six-element Imaging Lens System for Compact High-Resolution Optical Design
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Solution Overview
Problem
Conventional compact optical systems for electronic devices, such as smartphones and tablets, fail to meet the demands for high resolution and image quality due to overconcentration of refractive power and challenges in molding and assembling lens elements, particularly the fifth lens element with a high thickness ratio.
Innovation Solution
An imaging lens system comprising six lens elements with specific refractive powers and surface curvatures, including a first lens element with positive refractive power, a second lens element with positive refractive power, a third lens element with negative refractive power, a fourth lens element with refractive power, a fifth lens element with positive refractive power, and a sixth lens element with negative refractive power, featuring air gaps between adjacent elements to reduce sensitivity and improve image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional 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 patent divides the optical system into six distinct lens elements instead of five, with each element having specific refractive power assignments (positive, positive, negative, positive, negative). This segmentation allows better distribution of optical functions and correction of aberrations, improving image quality while maintaining manageable complexity through systematic design
2Length of stationary object
If the refractive power is concentrated at the object side to achieve compact size, then the system becomes more compact, but the sensitivity of the optical system increases
Solution Approach 1:
The patent assigns different refractive power characteristics to different regions of the optical system. The object-side lens elements have positive refractive power for compactness, while the image-side elements have negative refractive power to reduce sensitivity. This local differentiation of optical properties allows simultaneous achievement of compact size and reduced sensitivity
3Measurement precision
If the fifth lens element is designed with high thickness ratio for focusing on object, then the focusing capability is improved, but the molding and assembling becomes unfavorable
Solution Approach 1:
The patent modifies the thickness parameters of the fifth lens element by assigning it negative refractive power and specific curvature relationships (R5 and R6). This parameter change allows the element to achieve proper focusing capability while having more favorable thickness ratios that are easier to mold and assemble compared to high thickness ratio designs
4Manufacturing precision
If six lens elements are used to enhance resolution, then the image quality improves, but the device complexity increases
Solution Approach 1:
The patent employs six lens elements with specifically optimized parameters including refractive powers (positive, positive, negative, positive, negative), curvature radii relationships, and air gap distances. These parameter optimizations ensure that the additional element contributes to resolution enhancement while the overall system complexity remains manageable through systematic parameter control
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 enhances image quality by balancing refractive powers, reducing sensitivity, and maintaining a compact size, while the use of aspheric surfaces and air gaps improves the manufacturing process and image sensing efficiency.
Implementation Method 1
The first lens element with positive refractive power, the second lens element with positive refractive power, the third lens element with negative refractive power, the fourth lens element with refractive power, the fifth lens element with positive refractive power, and the sixth lens element with negative refractive power
Data Source
AI summary
An imaging lens system 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 thereof. The second lens element has refractive power. The third lens element with refractive power has an image-side surface being concave in a paraxial region thereof. 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 thereof. The sixth lens element with negative refractive power has an image-side surface being concave 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.