Six-Lens Optical System Aberration Control
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Solution Overview
Problem
Traditional optical image capturing systems for portable electronic devices face challenges in achieving high imaging quality with increased pixel count, large aperture, and wide view angle, due to issues like aberration, distortion, and manufacturing complexity.
Innovation Solution
The use of a six-piece optical image capturing system with specific refractive powers and surface geometries, including convex and concave surfaces, to enhance light intake and view angle, while minimizing lens size and correcting aberrations, is proposed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a large aperture design is used to increase light intake, then the quantity of incoming light is improved, but aberration increases resulting in deterioration of quality in peripheral image formation
Solution Approach 1:
The optical system is divided into six separate lens elements with specific 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 through coordinated design of multiple segments rather than relying on a single lens
Solution Approach 2:
Different lens elements are designed with specific local properties - some with positive refractive power and others with negative refractive power. The first lens element has a convex object-side surface with specific curvature to control peripheral light, while other elements have tailored curvatures and materials to correct specific aberration types in different regions of the optical field
2Area of moving object
If a wide view angle design is used to increase field of view, then the view angle is improved, but distortion rate increases resulting in deterioration of image formation quality
Solution Approach 1:
The wide view angle requirement is achieved through the combined effect of six lens elements rather than a single wide-angle lens. Each element contributes to the overall field of view while its specific curvature and position help control distortion in different angular regions, distributing the wide-angle function across multiple controlled segments
Solution Approach 2:
Multiple lens surfaces are designed with specific convex and concave curvatures. The object-side surface of the first lens element is convex, while other elements have alternating convex and concave surfaces with carefully controlled radii of curvature to expand the field of view while maintaining image quality and minimizing distortion across the wide angular range
3Quantity of substance
If pixel size is minimized to increase pixel count, then total pixels are improved, but imaging quality deteriorates due to increased aberration
Solution Approach 1:
The six-lens element design provides sufficient degrees of freedom to correct aberrations that become more significant with smaller pixel sizes and higher pixel counts. Each lens element can be optimized to control specific aberration types, ensuring that even with minimized pixel dimensions, the overall imaging quality is maintained through the collective aberration correction capability of the segmented system
Solution Approach 2:
The system uses specific parameter relationships - focal lengths of individual elements relative to the total focal length, refractive indices of different lens materials, and curvature radii of various surfaces - to optimize performance for high pixel count applications. These parameter changes allow the system to maintain imaging quality despite the challenges posed by smaller, more numerous pixels
4Manufacturing precision
If the number of lens elements is increased to correct aberration, then imaging quality is improved, but device complexity increases
Solution Approach 1:
Each of the six lens elements is designed to serve multiple functions simultaneously - correcting different types of aberrations (spherical, coma, astigmatism, field curvature), controlling light paths from different field angles, and contributing to the overall focal length. This multi-functionality reduces the need for even more elements, as each element performs several correction tasks rather than requiring specialized elements for each function
Solution Approach 2:
Specific parameter relationships are established to optimize the balance between correction capability and system simplicity. The ratios of focal lengths, refractive indices, and curvature radii are carefully controlled to ensure that six elements provide sufficient correction power without requiring additional elements, achieving the desired imaging quality with a moderate number of components
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
This configuration improves imaging quality and pixel density, reduces aberration, and facilitates miniaturization, enabling effective use in compact portable devices with dual-mode visibility for both visible and infrared light.
Implementation Method 1
use combination of refractive powers, convex and concave surfaces of six-piece optical lenses to increase the quantity of incoming light
Data Source
AI summary
A six-piece optical lens for capturing image and a six-piece optical module for capturing image are provided. In order from an object side to an image side, the optical lens along the optical axis includes a first lens with refractive power, a second lens with refractive power, a third lens with refractive power, a fourth lens with refractive power, a fifth lens with refractive power and a sixth lens with refractive power. At least one of the image-side surface and object-side surface of each of the six lens elements is aspheric. The optical lens can increase aperture value and improve the imagining quality for use in compact cameras.