Six-Lens Optical Imaging for High Resolution in Thin Camera Modules
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Solution Overview
Problem
Existing optical imaging systems with a small number of lenses face limitations in achieving high resolution and reduced width for thin-width camera modules, such as those used in portable devices like mobile phones.
Innovation Solution
An optical imaging system with six lenses, each having specific refractive powers and surface configurations, including convex and concave surfaces, and inflection points, with an F number of 1.7 or less, to enhance resolution and compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a small number of lenses is used, then the width of the camera module is reduced, but the resolution is limited
Solution Approach 1:
The optical system is segmented into six distinct lenses with specific refractive powers (two positive, four negative) arranged in sequence. Each lens is designed with specific surface configurations (convex/concave combinations) to perform specific optical functions, allowing the system to achieve both compact width and high resolution through functional segmentation of the imaging task across multiple elements
Solution Approach 2:
The patent applies parameter changes by specifying precise refractive powers for each lens (first and second lenses have positive refractive power, third through sixth lenses have negative refractive power) and controlling the F number to be 1.7 or less. The surface configurations are optimized with specific curvature relationships (e.g., object-side surface convex and image-side surface concave for certain lenses) to achieve the desired balance between compactness and resolution
2Measurement precision
If a large number of lenses is used, then the resolution is improved, but the width of the camera module increases
Solution Approach 1:
Each lens in the six-lens system is designed to perform multiple functions simultaneously. For example, the first lens with positive refractive power provides both light gathering and aberration correction, while the subsequent negative power lenses manage chromatic aberration and focus control. This multi-functionality allows six lenses to replace what would traditionally require more lenses, achieving high resolution without increasing width
3Manufacturing precision
If lenses with specific refractive powers are used, then aberration correction is improved, but the device complexity increases
Solution Approach 1:
The patent applies local quality by assigning specific surface configurations to specific lenses based on their position and refractive power. The first lens has convex object-side and concave image-side surfaces, while the second lens has both surfaces convex. The third through sixth lenses have varying combinations. This localized optimization of surface geometry for each lens element achieves superior aberration correction without requiring complex overall system architecture
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 high resolution and miniaturization, addressing the limitations of existing systems by optimizing lens configurations and surface shapes to improve aberration correction and chromatic aberration.
Implementation Method 1
A third lens, a fourth lens, and a fifth lens of the lenses have each have a negative refractive power
Data Source
AI summary
An optical imaging system includes lenses sequentially disposed from an object side toward an imaging plane. A third lens, a fourth lens, and a fifth lens of the lenses each have a negative refractive power. An F number of the optical imaging system is 1.7 or less.