Eight-Lens Imaging Optics With Aspheric Inflection Surfaces
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Solution Overview
Problem
Conventional optical systems struggle to balance high image quality, low sensitivity, proper aperture size, miniaturization, and desirable field of view, making them inadequate for modern electronic devices with multi-functional applications.
Innovation Solution
An imaging lens system comprising eight lens elements, each with specific refractive powers and configurations, including at least one lens surface with inflection points, to correct aberrations and achieve compactness, high image quality, and varied field of view, using materials like plastic and glass with aspheric surfaces to optimize light path control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lens elements is increased to improve image quality, then image quality is improved, but device complexity and size increase
Solution Approach 1:
The optical system is divided into multiple lens elements (first through eighth lens elements) with specific refractive powers and configurations. Each lens element contributes to correcting specific aberrations, allowing the system to achieve high image quality through distributed functional segments rather than a single complex element.
Solution Approach 2:
The patent employs aspheric surfaces on lens elements, where at least one lens surface has inflection points. These curved surfaces enable more effective control of light paths and aberration correction compared to spherical surfaces, improving image quality without requiring additional lens elements.
2Illumination intensity
If the aperture size is increased to improve brightness, then brightness is improved, but sensitivity increases which is undesirable
Solution Approach 1:
The patent optimizes the f-number parameter to satisfy f/EPD≥2.20, which balances the aperture size (EPD) relative to the focal length (f). This parameter control ensures adequate brightness while preventing excessive sensitivity, achieving a compromise between illumination intensity and system reliability.
3Adaptability or versatility
If the field of view is expanded for broader coverage, then field of view is improved, but aberration correction becomes more difficult
Solution Approach 1:
The patent divides the optical system into eight distinct lens elements, each with specific refractive powers (positive or negative). This segmentation allows different portions of the optical path to address different aberration types, enabling effective correction across a broad field of view that would be difficult with fewer elements.
Solution Approach 2:
Aspheric surfaces with inflection points are incorporated into the lens elements to correct off-axis aberrations that become more pronounced with expanded field of view. These complex curved surfaces enable better control of marginal rays and field curvature, maintaining image quality across a wider angular range.
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 achieves a balanced performance in image quality, sensitivity, and compact design, supporting diverse applications with improved brightness and reduced sensitivity, while maintaining manufacturing flexibility and cost-effectiveness.
Implementation Method 1
Each of the eight lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side. The first lens element has positive refractive power.
Implementation Method 2
At least one lens element of the imaging lens system has at least one lens surface having at least one inflection point.
Data Source
AI summary
An imaging lens system includes eight lens elements which are, in order from an object side to an image side: a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element and an eighth lens element. Each of the eight lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side. At least one lens element of the imaging lens system has at least one lens surface having at least one inflection point. The imaging lens system has a total of eight lens elements.