Seven-Lens Optical System Aperture and Aberration Control
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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 a small number of lenses.
Innovation Solution
A compact optical image capturing system utilizing a seven-piece optical lens configuration with specific refractive powers, aspheric surfaces, and inflection points to optimize light entry and correct aberrations, allowing for improved imaging quality and reduced size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional optical system with five or six lenses is used, then high optical performance is provided, but the system size is large and light intake is limited
Solution Approach 1:
The optical system is divided into seven distinct lens elements (first lens to seventh lens), each with specific refractive power and surface characteristics. This segmentation allows optimization of light transmission through each individual element while maintaining overall system performance, directly addressing the light intake limitation in conventional systems.
Solution Approach 2:
Different lens elements are assigned different local qualities: the first lens has a convex object-side surface for light gathering, the fourth lens has negative refractive power for aberration correction, and the seventh lens has a concave image-side surface for focal control. This localized optimization of each lens element's properties maximizes overall light intake while managing system complexity.
2Illumination intensity
If the aperture is increased to capture more light in dark environments, then imaging quality in low light improves, but the system becomes larger and more complex
Solution Approach 1:
Multiple lens surfaces are designed with aspheric curvature rather than simple spherical shapes. The convex object-side surface of the first lens and the concave image-side surface of the seventh lens use curved geometries to efficiently gather and focus light from larger aperture areas, increasing light intake without proportionally increasing system height.
Solution Approach 2:
The system employs precise control of refractive power parameters across the seven lens elements. By optimizing the refractive power distribution (positive in first, second, third, fifth, sixth lenses; negative in fourth lens), the system achieves large effective aperture with controlled focal length, preventing excessive system height expansion.
3Manufacturing precision
If more lenses are added to improve imaging quality and correct aberrations, then image quality improves, but the system size and complexity increase
Solution Approach 1:
Each lens element serves multiple functions: the first lens with convex object-side surface performs both light gathering and initial focusing; the fourth lens with negative refractive power simultaneously corrects spherical and chromatic aberrations; the seventh lens with concave image-side surface provides final focal control and field flattening. This multi-functionality reduces the need for additional specialized elements.
Solution Approach 2:
The optical system uses composite lens design combining different refractive power characteristics (positive and negative lenses) and different surface geometries (convex and concave surfaces). This composite approach allows aberration correction through material and geometric properties rather than requiring additional separate correction elements, managing system complexity.
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 corrects aberrations, enhancing imaging quality while maintaining a compact form factor suitable for portable devices.
Implementation Method 1
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 in order from an object side to an image side along an optical axis
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.