Seven-Lens Optical System with Aspheric Inflection Points
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Solution Overview
Problem
Conventional optical image capturing systems in portable electronic devices face challenges in increasing light intake and achieving high imaging quality, especially in low-light environments, due to limitations in lens design and material properties.
Innovation Solution
A compact optical image capturing system utilizing a seven-piece optical lens configuration with specific refractive powers, convex and concave surfaces, and inflection points to optimize light entry and correct aberrations, allowing for improved imaging quality across various light conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional optical systems use five or six lenses, then the system structure is relatively simple, but the light intake is insufficient and imaging quality in dark environments is poor
Solution Approach 1:
The optical system is divided into seven distinct lens elements (first through seventh lenses) with specific refractive power assignments. Each lens contributes to light gathering and correction, with the first lens having negative refractive power and subsequent lenses having positive refractive power, creating a segmented approach to optimizing light intake while managing system complexity
Solution Approach 2:
The seven lenses are arranged in a nested configuration along the optical axis, with each lens positioned sequentially from the object side to the image side. This nested arrangement allows compact integration of multiple optical elements, increasing light intake capability while controlling the overall system size and complexity
2Illumination intensity
If the optical system uses a large aperture to increase light intake, then imaging quality in dark environments improves, but optical aberrations increase
Solution Approach 1:
Different regions of the optical system are assigned specific functions: the first lens with negative refractive power handles initial light convergence, while subsequent lenses with positive refractive power progressively correct aberrations. The aspheric surfaces on specific lenses (second, third, fourth, fifth, sixth, and seventh lenses) provide localized correction for spherical and other optical aberrations, enabling large aperture operation while maintaining image quality
Solution Approach 2:
Aspheric surfaces are implemented on multiple lenses (second through seventh lenses) to correct spherical aberration and other optical defects. The aspheric profiles provide non-spherical curvature that optimizes light ray convergence across the aperture, enabling large aperture designs to achieve diffraction-limited performance and reduce optical aberrations
3Manufacturing precision
If more lenses are added to improve imaging quality, then image formation quality improves, but the system size and complexity increase
Solution Approach 1:
Each lens element serves multiple functions: the first lens provides initial light convergence with negative refractive power, while subsequent lenses with positive refractive power simultaneously contribute to focusing and aberration correction. The aspheric surfaces on multiple lenses provide universal correction for various optical defects, allowing seven lenses to achieve high imaging quality without requiring additional specialized elements
Solution Approach 2:
The patent utilizes aspheric surface geometry to add a dimensional aspect to lens design, moving beyond simple spherical surfaces. This dimensional change in surface profile allows each lens to perform multiple optical functions, improving imaging quality without linearly increasing the number of lens elements required
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 enhances light intake and image quality by adjusting incident angles and modifying optical paths, effectively addressing the limitations of conventional systems in low-light environments and achieving high imaging performance.
Implementation Method 1
an optical image capturing system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens along an optical axis from an object side to an image side. The first lens has negative refractive power, and the second to seventh lenses have positive refractive power
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, a fifth lens, a sixth lens, and a seventh lens. At least one lens among the first to the sixth lenses has positive refractive force. The seventh 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 seventh lenses. The optical image capturing system can increase aperture value and improve the imagining quality for use in compact cameras.