Five-Lens Optical System with Aspheric Inflection Points for High Aperture Imaging
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Solution Overview
Problem
Conventional optical systems in portable electronic devices struggle to provide high optical performance, especially in low-light environments, due to limitations in light intake and image quality.
Innovation Solution
A compact optical image capturing system utilizing a combination of refractive powers and aspheric surfaces in five-piece optical lenses, including inflection points, to enhance light intake and improve imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional optical systems use three or four lenses, then the device complexity is reduced, but the light intake and imaging quality deteriorate
Solution Approach 1:
The optical system is divided into five distinct lens elements (first through fifth lenses) with specific refractive power distributions. Each lens contributes to the overall light gathering capability while maintaining compact form factor. The segmentation allows optimization of each element's function to maximize light intake without proportionally increasing complexity.
Solution Approach 2:
The patent specifies precise parameter ranges including focal length ratios (0.3<|f1|/f5<2.0), curvature radii relationships (R1<R2 and R9>R10), and position ratios (0.1<|BGI511|/|BGI521|<1.0). These parameter optimizations enable the five-lens system to achieve superior light intake and imaging quality compared to conventional three or four-lens systems.
2Illumination intensity
If the aperture is increased to take pictures in dark environment, then the light intake is improved, but the optical performance and image quality deteriorate
Solution Approach 1:
The optical system employs a composite lens structure where the first lens has positive refractive power and the second through fifth lenses have negative refractive power. This composite arrangement with alternating refractive power signs enables the system to maintain high optical performance while achieving large aperture for improved light intake in dark environments.
Solution Approach 2:
The patent utilizes aspheric surfaces with specific curvature relationships (R1<R2 for the first lens, R9>R10 for the fifth lens) to control light paths effectively. The curved surface designs enable the large aperture system to maintain excellent aberration correction and imaging quality, preventing performance deterioration despite the increased aperture size.
3Measurement precision
If five-piece optical lenses with aspheric surfaces are used, then the imaging quality is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies aspheric surfaces selectively to specific lens elements (first lens with object-side surface, fifth lens with image-side surface) rather than all surfaces. The local application of complex aspheric geometry to critical surfaces achieves high imaging quality while limiting the overall manufacturing complexity and precision requirements across the entire system.
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 enhances imaging quality, addressing the limitations of conventional systems by optimizing lens parameters and aberration correction, suitable for minimized electronic products.
Implementation Method 1
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. The fifth lens can have negative refractive force, wherein both surfaces thereof are aspheric, and at least one surface thereof has an inflection point. The lenses in the optical image capturing system which have refractive power include the first to the fifth lenses. The optical image capturing system can increase aperture value and improve the imaging quality for use in compact cameras.