Eight-Lens Photographing Assembly for Compact High-Resolution Imaging
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Solution Overview
Problem
Conventional optical systems face challenges in achieving a balance between high image quality, low sensitivity, proper aperture size, miniaturization, and a desirable field of view, making it difficult to meet increasing functionality requirements in electronic devices with advanced image sensors.
Innovation Solution
A photographing lens assembly comprising eight lens elements with specific refractive powers and surface curvatures, including positive and negative refractive power elements with convex and concave surfaces, optimized to satisfy conditions such as curvature ratios and axial distances to achieve compactness, improved image quality, and reduced total track length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional optical systems are used, then the structure is simple, but the image quality cannot meet high requirements while maintaining miniaturization
Solution Approach 1:
The optical system is divided into multiple lens elements (at least six lens elements) with different refractive powers and surface curvatures. Each lens element contributes to correcting specific aberrations, enabling high image quality in a compact configuration that would be impossible with conventional simple optical systems.
Solution Approach 2:
Different lens elements are designed with specific local properties: some have positive refractive power with convex object-side surfaces, others have negative refractive power with concave image-side surfaces. This local differentiation allows each element to address specific optical aberrations while maintaining overall system compactness.
2Manufacturing precision
If the number of lens elements is increased to improve image quality, then the imaging capability is enhanced, but the total track length increases
Solution Approach 1:
The patent optimizes specific parameter relationships to control total track length. By constraining the ratio of the focal length to the total track length within a specific range (0.25-0.45) and controlling axial distances between lens elements, the system achieves high imaging capability with minimized length.
Solution Approach 2:
Instead of simply adding lens elements along the optical axis (one dimension), the patent uses aspheric surfaces with critical points in off-axis regions. This introduces control in another dimensional space, allowing compact arrangement of multiple elements without proportionally increasing the total track length.
3Volume of moving object
If lens elements with specific curvatures are used to reduce total track length, then miniaturization is achieved, but the field of view becomes limited
Solution Approach 1:
The patent employs aspheric surfaces with specific curvature characteristics, including critical points in off-axis regions. These curved surfaces are strategically designed to expand the field of view while maintaining compact dimensions, overcoming the limitation of simple spherical surfaces in compact optical systems.
Solution Approach 2:
The optical system uses asymmetric surface curvatures with different characteristics on object-side and image-side surfaces of various lens elements. This asymmetry allows the system to achieve both compactness and wide field of view by optimizing light paths for different field angles independently.
4Manufacturing precision
If the aperture size is optimized for low sensitivity, then the image quality improves, but the system becomes more complex
Solution Approach 1:
Each lens element serves multiple functions simultaneously: refracting light, correcting specific aberrations (spherical, coma, astigmatism), and contributing to overall system compactness. This multi-functionality reduces the need for additional specialized components, maintaining relatively simple system architecture while achieving high image quality.
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 enables better imaging capabilities, improved image quality, and proper design flexibility, effectively addressing the balance between miniaturization and functionality in electronic devices with advanced image sensors.
Implementation Method 1
a first lens element with positive refractive power, a second lens element with negative refractive power, a third lens element with positive refractive power, a fourth lens element with positive refractive power, a fifth lens element with negative refractive power, a sixth lens element with negative refractive power, a seventh lens element with positive refractive power and an eighth lens element with negative refractive power
Data Source
AI summary
A photographing lens assembly includes eight 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, a seventh lens element and an eighth lens element. The first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof. The sixth lens element has an image-side surface being concave in a paraxial region thereof. The seventh lens element has an image-side surface being concave in a paraxial region thereof. The eighth lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof, and the image-side surface of the eighth lens element has at least one critical point in an off-axis region thereof.