Five-Lens Optical System with Aspheric Surfaces for Aberration Control
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Solution Overview
Problem
Conventional optical systems for portable electronic devices face challenges such as large aberration, poor image quality at the periphery, and manufacturing difficulties due to the need for a large aperture, while also requiring high pixels, high image quality, and a wide angle of view.
Innovation Solution
A compact optical image capturing system utilizing a combination of five-piece optical lenses with specific refractive powers and aspheric surfaces to optimize light entry and image formation, including a fifth lens with inflection points to adjust incident angles and correct aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the aperture is increased to capture more light in dark environments, then the quantity of light entering the lens is improved, but aberration increases and image quality at the periphery deteriorates
Solution Approach 1:
The optical system is divided into five separate lens elements with distinct functions. The first lens element has positive refractive power for light convergence, while the second through fifth elements progressively correct various types of aberrations. This segmentation allows each element to be optimized for its specific function, managing aberration control while maintaining large aperture capability.
Solution Approach 2:
Different regions of the optical system are assigned different functional qualities. The first lens element focuses on light gathering with positive refractive power, while subsequent elements introduce negative refractive powers and specific surface curvatures (convex/concave combinations) to locally correct aberrations in different field zones, particularly improving peripheral image quality.
2Illumination intensity
If the aperture is increased to capture more light, then the quantity of light entering the lens is improved, but manufacturing difficulty increases
Solution Approach 1:
By dividing the optical system into five manageable lens elements rather than attempting to create a single complex large-aperture lens, the manufacturing process becomes more feasible. Each element can be manufactured and tested independently, reducing overall manufacturing difficulty despite the large aperture requirement.
Solution Approach 2:
Multiple lens elements with smaller individual apertures are combined to achieve the equivalent optical effect of a single large-aperture lens. This combination approach allows each element to be manufactured within standard capabilities while collectively providing the required light-gathering ability.
3Adaptability or versatility
If a wide-angle design is adopted to increase the angle of view, then the field of view is improved, but distortion increases
Solution Approach 1:
Different lens elements are designed with specific surface curvatures (convex or concave) to address distortion in different regions of the field of view. The combination of these locally optimized surfaces across five elements collectively corrects wide-angle distortion while maintaining the broad angle of view.
Solution Approach 2:
The wide-angle correction function is distributed across multiple lens elements rather than relying on a single element. This segmentation allows progressive correction of distortion throughout the optical path, managing the inherent distortion problems of wide-angle designs.
4Manufacturing precision
If the number of lens elements is increased to improve image quality, then imaging quality is improved, but device size increases
Solution Approach 1:
The lens elements utilize aspheric surfaces with varying curvature parameters (convex and concave surfaces) to achieve high image quality correction. This parameter optimization allows five elements to provide sufficient aberration correction without requiring more elements, thereby controlling system size while maintaining 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 system enhances light entry and image quality, reduces size, and corrects aberrations, enabling high-resolution imaging with improved peripheral performance and manufacturing efficiency.
Implementation Method 1
combination of refractive powers, convex and concave surfaces of five-piece optical lenses to increase the quantity of incoming light
Implementation Method 2
both the object-side surface and the image-side surface of the fifth lens are aspheric surfaces... the fifth lens is provided with an inflection point to adjust the incident angle of each view field and modify the ODT and the TDT
Data Source
AI summary
A five-piece optical lens for capturing image and a five-piece optical module for capturing image, along the optical axis in order from an object side to an image side, include a first lens with positive refractive power having a convex object-side surface; a second lens with refractive power; a third lens with refractive power; a fourth lens with refractive power; and a fifth lens with negative refractive power; and at least one of the image-side surface and object-side surface of each of the five lens elements are aspheric. The optical lens can increase aperture value and improve the imagining quality for use in compact cameras.