Four-Lens Optical System with Aspheric Surfaces for Compact Camera Aberration Control
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Solution Overview
Problem
Traditional optical image capturing systems for portable electronic devices face challenges in balancing high pixel counts, image quality, and miniaturization, particularly in achieving large apertures and wide-angle views while managing aberrations and distortion, and they require IR Cut filters which are bulky and expensive.
Innovation Solution
An optical image capturing system utilizing a combination of four lenses with convex and concave surfaces to increase light admission and angle of view, achieving a near-confocal effect between visible and infrared light focal lengths, thereby reducing the need for IR Cut filters and enhancing image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a large aperture is designed to increase light admission for micro filming and night filming, then the amount of admitted light is improved, but aberration increases and manufacturing difficulty increases
Solution Approach 1:
The optical system is divided into multiple lens elements (at least four lenses) with different refractive powers and surface configurations. Each lens element contributes partially to the overall light gathering capability while distributing the aberration correction tasks across multiple components, making the system manageable and manufacturable.
Solution Approach 2:
The patent employs asymmetric surface designs including convex and concave surfaces with different curvatures on each lens element. This asymmetric configuration allows optimization of light paths to reduce aberrations while maintaining large aperture capability, resolving the contradiction between light admission and aberration control.
2Area of moving object
If a wide-angle view design is implemented to fulfill self-filming functionalities, then the angle of view is improved, but distortion rate increases
Solution Approach 1:
The wide-angle field of view is achieved through segmentation of the optical path across multiple lens elements, each contributing to the overall angle of view while individually managing distortion characteristics. This distributed approach allows better control over image quality across the wide field.
Solution Approach 2:
The patent utilizes curved surfaces (convex and concave) on lens elements to manipulate light paths in a wide-angle configuration. The specific curvature designs help correct distortion inherent in wide-angle views while maintaining the expanded field of view for self-filming applications.
3Manufacturing precision
If an ICR filter is added to filter infrared light for visible light fidelity, then image fidelity is improved, but device size and cost increase
Solution Approach 1:
The infrared filtering function is merged into the existing lens elements through careful selection of lens materials with appropriate transmission characteristics. This integration eliminates the need for a separate ICR filter component, reducing device size and complexity while maintaining image fidelity.
Solution Approach 2:
The lens elements serve multiple functions: they focus visible light, control aberrations, and simultaneously filter infrared light through their material properties. This multi-functionality reduces the total number of components needed in the optical system.
4Measurement precision
If high pixel count is increased to improve image quality, then image quality is improved, but the demand on optical system performance increases leading to more aberration
Solution Approach 1:
The optical system uses multiple lens elements to distribute the high-resolution imaging task across several components. Each lens element can be optimized for its specific portion of the optical path, allowing the system to support high pixel counts while maintaining aberration control through divided responsibility.
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 effectively balances high pixel counts and image quality, reduces aberrations, and miniaturizes camera modules while eliminating the need for bulky IR Cut filters, improving image fidelity and brightness across various lighting conditions.
Implementation Method 1
an optical image capturing system, and more particularly to a compact optical image capturing system which can be applied to electronic products
Implementation Method 2
utilize the refractive power of four lenses, a combination of convex and concave surfaces of the four lenses, as well as a selection of materials thereof, so as to reduce the difference between the image focal length of visible light and the image focal length of infrared light
Data Source
AI summary
The invention discloses a four-piece optical lens for capturing image and a four-piece optical module for capturing image. From an object side to an image side, the optical lenses along the optical axis comprises a first lens with refractive power, a second lens with refractive power, a third lens with refractive power, and a fourth lens with refractive power; and at least one of an image-side surface and object-side surface of each of the four lens elements are aspheric. The optical lens can increase aperture value and improve the image quality for use in compact cameras.