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 when required to have a large aperture or wide view angle, which complicates manufacturing and affects peripheral image quality.
Innovation Solution
The optical image capturing system employs a combination of refractive powers and inflection points on the surfaces of three-piece lenses to adjust incident angles and modify optical paths, enhancing light entry, view angle, and pixel density, while controlling lens thickness and refractive indices to correct aberrations and improve imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the aperture is increased to allow more light entry and achieve wide view angle, then the light intake and view angle are improved, but the aberrations increase causing poor imaging quality at peripheral portions
Solution Approach 1:
The optical system is divided into three separate lenses instead of using a single lens or two lenses. Each lens contributes to the overall optical power while allowing individual optimization of surface shapes and materials to control aberrations across different field regions.
Solution Approach 2:
Different surfaces of the lenses are designed with specific convex or concave characteristics tailored to local requirements. For example, the object-side surface of the first lens is convex while its image-side surface is concave, and similar differentiated designs are applied to other lenses to correct aberrations in specific regions while maintaining overall performance.
2Adaptability or versatility
If the aperture is increased to achieve wide view angle, then the view angle is improved, but the distortion increases causing poor imaging quality
Solution Approach 1:
The optical system is divided into three separate lenses instead of using a single lens or two lenses. Each lens contributes to the overall optical power while allowing individual optimization of surface shapes and materials to control aberrations across different field regions.
Solution Approach 2:
The lenses are designed with asymmetric surface characteristics where object-side surfaces and image-side surfaces have different curvatures (convex or concave). This asymmetric design allows differential correction of distortion across the wide field of view while maintaining the required view angle.
3Manufacturing precision
If the number of lenses is increased to improve imaging quality, then the imaging quality is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
Instead of using more than three lenses which would over-complicate the system, the invention uses exactly three lenses with carefully optimized surface characteristics. This partial action approach achieves sufficient aberration correction and imaging quality improvement without the excessive complexity that would result from adding more lens elements.
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 approach results in improved light intake, wider view angles, higher pixel density, and enhanced imaging quality, suitable for compact electronic devices, while also simplifying manufacturing and reducing aberrations across the image field.
Implementation Method 1
an optical image capturing system includes a first lens, a second lens, and a third lens from an object side to an image side... The first lens has positive refractive power; the second lens has negative refractive power; and the third lens has positive refractive power
Data Source
AI summary
The invention discloses a three-piece optical lens for capturing image and a three-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.