Seven-Element Lens Assembly for Off-Axis Aberration Correction
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Solution Overview
Problem
Conventional optical lens modules face challenges in simultaneously achieving a large aperture and short total track length, particularly in enhancing image quality in the off-axis region while maintaining compactness.
Innovation Solution
A photographing lens assembly comprising seven lens elements with specific refractive powers and surface shapes, including aspheric surfaces, is designed to balance refractive power distribution, correct aberrations, and optimize axial distances to improve image quality in the off-axis region while maintaining a compact form factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional optical lens modules use a large aperture configuration, then the image quality in the off-axis region is improved, but the total track length increases
Solution Approach 1:
The optical system is divided into seven distinct lens elements with specific refractive powers and surface shapes. Each lens element is optimized to contribute to correcting off-axis aberrations while maintaining a compact overall structure, allowing the system to achieve large aperture performance without proportionally increasing total track length
Solution Approach 2:
The patent employs aspheric surfaces on multiple lens elements, including the seventh lens element which has a convex shape in its off-axis region. These curved surfaces are specifically designed to correct off-axis aberrations and enable large aperture operation while controlling the total track length through optimized curvature profiles
2Measurement precision
If the aperture size is increased to enhance off-axis imaging, then the image quality is improved, but the device complexity increases
Solution Approach 1:
The seventh lens element is designed with a specific convex shape in its off-axis region, creating local optical properties that针对性地 correct off-axis aberrations. This localized design approach allows the system to improve off-axis image quality without requiring complex modifications to the entire lens assembly
Solution Approach 2:
The patent optimizes specific parameters including the axial distance between the sixth and seventh lens elements (T67), the curvature radius of the fourth lens element (R7), and the curvature radius of the sixth lens element (R12). These parameter adjustments enable large aperture operation with improved off-axis performance while managing overall system complexity
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 enhances image quality in the off-axis region with a large aperture configuration, reduces spherical aberration, and achieves a compact design suitable for electronic devices.
Implementation Method 1
The first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof. The second lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof.
Implementation Method 2
The object-side surface and the image-side surface of the seventh lens element are aspheric. The image-side surface of the seventh lens element includes at least one convex shape in an off-axis region thereof
Data Source
AI summary
A photographing lens assembly includes seven lens elements, which are, 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, a sixth lens element and a seventh 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 with negative refractive power has an image-side surface being concave in a paraxial region thereof. The seventh lens element has an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof. The image-side surface of the seventh lens element includes at least one convex shape in an off-axis region thereof. The object-side surface and the image-side surface of the seventh lens element are aspheric.