Five-Lens Optical System Aberration Control via Aspheric Surfaces
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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 difficulty in manufacturing due to the need for large apertures, while also requiring high pixels, high image quality, and a wide angle of view.
Innovation Solution
A compact optical image capturing system using a combination of five-piece optical lenses with specific refractive powers and aspheric surfaces, including inflection points on the fifth lens, to optimize light entry and reduce aberrations, achieving improved imaging quality and size reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the aperture is increased to capture more light for dark environment photography, then the quantity of light entering the lens is improved, but aberration increases and image quality at periphery deteriorates
Solution Approach 1:
The optical system is divided into five separate lens elements with different refractive powers and surface curvatures. Each lens element contributes to correcting specific types of aberrations, allowing the system to maintain large aperture while controlling overall aberration and improving peripheral image quality.
Solution Approach 2:
Different lens elements have locally optimized properties: the first lens has positive refractive power with specific curvature for light gathering, the second lens has negative refractive power for aberration correction, the third and fourth lenses have positive power for focal convergence, and the fifth lens has negative power for final aberration control. Each element's surface curvature and refractive index are locally optimized to address specific optical challenges.
2Adaptability or versatility
If a wide-angle design is used to increase the angle of field, then the view angle is improved, but distortion increases
Solution Approach 1:
The wide-angle optical path is achieved through segmentation into five lens elements, each contributing a portion of the total angle of field. This distributed approach allows better control of ray angles and reduces peripheral distortion compared to a single-element wide-angle lens.
Solution Approach 2:
The system uses varied refractive powers and surface curvatures across the five lens elements to achieve wide angle of field while controlling distortion. The specific combination of positive and negative powered lenses, along with their surface parameters, is optimized to balance field angle and distortion characteristics.
3Manufacturing precision
If more lens elements are added to improve image quality and reduce aberration, then optical performance is improved, but device size and complexity increase
Solution Approach 1:
The optical system is segmented into five lens elements, which is optimized to provide sufficient aberration correction and image quality improvement without excessive complexity. This number balances the need for multiple elements to correct different types of aberrations with the constraint of keeping the system compact and manageable.
Solution Approach 2:
Each lens element serves multiple functions: the first lens gathers light and begins focal convergence, the second lens corrects spherical and chromatic aberrations, the third and fourth lenses continue focal convergence and aberration control, and the fifth lens provides final aberration correction. This multi-functionality reduces the need for additional dedicated correction elements.
4Ease of manufacture
If the number of lens elements is reduced to simplify manufacturing, then ease of manufacture is improved, but aberration control and image quality deteriorate
Solution Approach 1:
The system uses five lens elements, a number that balances manufacturing feasibility with aberration control capability. This segmentation provides enough degrees of freedom to correct major aberration types while remaining manufacturable with conventional precision.
Solution Approach 2:
The lens elements use specific refractive powers and surface curvatures that are optimized for both manufacturability and aberration control. The parameters are chosen to achieve good optical performance with realistic manufacturing tolerances.
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 aberrations, and miniaturizes the optical system while maintaining high performance, suitable for high-resolution image capture in compact electronic devices.
Implementation Method 1
Optical image capturing system includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens in order along an optical axis from an object side to an image side. The first lens has positive refractive power... Both the object-side surface and the image-side surface of the fifth lens are aspheric surfaces.
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.