Eight-Element Optical Imaging Lens for High Resolution
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Solution Overview
Problem
Portable electronic devices require optical imaging lenses with larger apertures and increased image heights to improve resolution, but this leads to design challenges such as increased aberrations and complexity, making it difficult to balance aperture, image height, and resolution within a limited system length.
Innovation Solution
An optical imaging lens design comprising specific arrangements of lens elements with varying refracting powers and surface shapes, including convex and concave regions, that satisfy certain conditional expressions to enhance aperture, image height, and resolution, such as the fifth lens element having positive refracting power and the seventh lens element's image-side surface being convex, while maintaining good imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the aperture and image height are increased to improve resolution, then the imaging quality is improved, but the system length increases and design complexity increases
Solution Approach 1:
The optical imaging lens is divided into eight lens elements with different refracting powers and surface shapes. Each lens element is specifically designed to address particular aberrations while contributing to the overall resolution improvement, allowing complex optical functions to be distributed across multiple simpler components
Solution Approach 2:
Different lens elements have different refracting powers (positive or negative) and different surface shape characteristics (convex or concave optical axis regions). This local differentiation allows each element to be optimized for specific optical corrections, enabling high resolution without uniformly increasing system complexity
2Measurement precision
If more lens elements are added to improve resolution, then the imaging quality is improved, but the system length increases
Solution Approach 1:
The lens elements are arranged with varying refracting powers and surface shapes that dynamically correct aberrations at different optical paths. This dynamic design allows compact packaging of eight lens elements without linearly increasing system length, as each element contributes differently to the overall optical correction
Solution Approach 2:
Multiple lens elements with different functions are nested along the optical path in a compact arrangement. The elements are positioned and sized to fit within a constrained system length while maintaining their individual optical correction functions, similar to nested dolls occupying space efficiently
3Measurement precision
If the aperture is increased to improve resolution, then the imaging quality is improved, but various aberrations increase
Solution Approach 1:
Lens elements with negative refracting power are strategically placed to convert the harmful effect of increased aberrations (caused by large aperture) into beneficial aberration correction. The negative power elements counterbalance the positive power elements, transforming the aberration problem into an opportunity for improved optical performance
Solution Approach 2:
Intermediate lens elements act as mediators between the large aperture and the image plane, progressively correcting aberrations as light passes through each element. These intermediate elements with specific surface shapes and refracting powers serve as optical intermediaries that refine the light paths before final image formation
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 design achieves a large aperture, increased image height, and improved resolution while minimizing aberrations and design complexity, resulting in better imaging quality and system performance.
Implementation Method 1
Each of the first lens element to the eighth lens element includes an object-side surface facing the object side and allowing imaging rays to pass through and an image-side surface facing the image side and allowing the imaging rays to pass through
Data Source
AI summary
An optical imaging lens is provided. The optical imaging lens includes 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 sequentially arranged along an optical axis from an object side to an image side. Each of the first lens element to the eighth lens element comprises an object-side surface facing the object side and allowing imaging rays to pass through and an image-side surface facing the image side and allowing the imaging rays to pass through. The second lens element has negative refracting power. The fifth lens element has positive refracting power. An optical axis region of the image-side surface of the seventh lens element is convex. Lens elements of the optical imaging lens are only the eight lens elements described above.