Five-Lens Optical System with Aspheric Surfaces for Compact Cameras
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Solution Overview
Problem
Conventional optical systems in portable electronic devices face challenges in capturing high-quality images in low-light environments due to limited light intake and aberrations, particularly in compact designs with multiple lenses.
Innovation Solution
A compact optical image capturing system utilizing a five-piece optical lens configuration with refractive powers, aspheric surfaces, and inflection points to optimize light entry and correct aberrations, including the use of plastic or glass lenses with specific thickness and curvature ratios to enhance imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the aperture is increased to capture more light in dark environments, then the light intake is improved, but the device size and complexity increase
Solution Approach 1:
The optical system is divided into five separate lens elements with specific refractive powers and surface curvatures. Each lens element contributes to the overall light gathering capability while maintaining a compact form factor, avoiding the need for a single large aperture lens that would increase device complexity
Solution Approach 2:
Multiple lens elements are combined in a single optical system to achieve high light intake equivalent to a large aperture while maintaining compact dimensions. The five-piece lens configuration merges the functions of light gathering, focusing, and aberration correction into a unified compact structure
2Manufacturing precision
If more lens elements are added to improve imaging quality and correct aberrations, then the imaging quality is improved, but the device size and manufacturing complexity increase
Solution Approach 1:
Each lens element is designed with specific local characteristics including particular refractive powers, surface curvatures, and aspheric coefficients tailored to correct specific types of aberrations. This localized optimization allows effective aberration correction without requiring an excessive number of lens elements
Solution Approach 2:
Aspheric surfaces are implemented on multiple lens elements to correct spherical aberration and other optical imperfections. The aspheric profiles provide precise control over light ray paths, achieving high imaging quality with a moderate number of lens elements rather than requiring numerous spherical lenses
3Reliability
If the number of lenses is increased to achieve high optical performance, then the optical performance is improved, but the compactness of the device is reduced
Solution Approach 1:
The five lens elements are arranged in a compact nested configuration where each subsequent lens element is positioned closely to the previous one. This nested arrangement minimizes the overall length of the optical system while accommodating multiple lens elements required for high optical performance
Solution Approach 2:
The optical system utilizes complex three-dimensional surface profiles including aspheric and inflection point geometries to achieve precise optical control within a compact volume. By optimizing the spatial arrangement and surface curvature in multiple dimensions, the system achieves high performance without proportional increases in device length
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 increases light intake and improves imaging quality by adjusting incident angles and modifying optical paths, while maintaining a compact size and reducing manufacturing complexity.
Implementation Method 1
an optical image capturing system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and an image plane, in order along an optical axis from an object side to an image side
Data Source
AI summary
An optical image capturing system includes, along the optical axis in order from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. At least one lens among the first to the fifth lenses has positive refractive force, wherein the fifth lens can have negative refractive force, wherein both surfaces thereof are aspheric, and at least one surface thereof has an inflection point and wherein the first to the fifth lenses in the optical image capturing system have refractive power whereby the optical image capturing system can increase aperture value and improve the imaging quality for use in compact cameras.