Three-Lens Optical System Aberration Control via Segmentation
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Solution Overview
Problem
Conventional optical systems for portable electronic devices face challenges in achieving high imaging quality due to aberrations and distortion, especially in low-light conditions and wide view angles, while also requiring miniaturization and increased pixel density.
Innovation Solution
A compact optical image capturing system utilizing a combination of refractive powers and aspheric surfaces in three-piece lenses to enhance light intake, widen the view angle, and improve image quality, with specific lens parameters and surface profiles optimized to correct aberrations and reduce manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the aperture is increased to allow more light and wider view angle, then the light intake and view angle are improved, but aberrations increase and imaging quality at peripheral portions deteriorates
Solution Approach 1:
The optical system is divided into multiple lens elements (first lens with negative refractive power, second lens with positive refractive power, and third lens with positive refractive power) instead of using a single large-aperture lens. This segmentation allows each lens element to contribute differently to light gathering and image formation, enabling large aperture while controlling aberrations through the combined optical paths of multiple elements.
Solution Approach 2:
Different regions of the optical system are designed with different properties: the first lens (with negative power) handles peripheral light rays to control distortion, the second lens (with positive power) provides focusing power, and the third lens fine-tunes the optical path. Each lens element has specific surface curvatures and positions optimized for its local function, allowing the overall system to achieve both large aperture and high imaging quality across the entire field of view.
2Illumination intensity
If the aperture is increased to allow more light and wider view angle, then the light intake and view angle are improved, but the manufacturing complexity increases
Solution Approach 1:
The patent specifies precise parameter ranges for the optical system to achieve the desired balance between performance and manufacturability. Key parameters include: the ratio of focal length to entrance pupil diameter (1 ≤ f/HEP ≤ 10), the view angle (0° ≤ 2ω ≤ 150°), and the profile curve length ratio (0.9 ≤ 2(ARE/HEP) ≤ 2.0). These parameter constraints guide the design and manufacturing process, ensuring that the complex multi-element lens system can be produced with controlled complexity while maintaining large aperture capabilities.
3Adaptability or versatility
If the view angle is widened to satisfy selfie requirements, then the view angle is improved, but distortion increases
Solution Approach 1:
The optical system uses multiple lens elements with different refractive powers arranged in sequence. The first lens (negative power) specifically addresses peripheral ray control to reduce distortion, while the second and third lenses (positive power) provide focusing and fine-tuning. This segmented approach allows the system to achieve wide view angles (0° ≤ 2ω ≤ 150°) while each element contributes to correcting distortion in its respective optical zone.
Solution Approach 2:
The patent employs asymmetric surface designs, particularly noting that the object-side surface of the first lens is convex and the image-side surface is concave, creating an asymmetric lens shape that helps control distortion. The aspheric surfaces of subsequent lenses further introduce controlled asymmetries to correct distortion while maintaining the wide field of view, allowing the system to capture broad scenes without excessive geometric distortion.
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 achieves improved imaging quality, reduced aberrations, and increased pixel density, suitable for miniature electronic devices, while maintaining compactness and efficiency.
Implementation Method 1
The first lens has negative refractive power
Implementation Method 2
The second lens has positive refractive power
Implementation Method 3
The third lens has positive refractive power
Data Source
AI summary
The invention discloses a three-piece optical lens for capturing image and a five-piece optical module for capturing image. In order from an object side to an image side, the optical lens along the optical axis comprises a first lens with positive refractive power; a second lens with refractive power; and a third lens with refractive power; and at least one of the image-side surface and object-side surface of each of the three lens elements are aspheric. The optical lens can increase aperture value and improve the imaging quality for use in compact cameras.