Five-Lens Optical Imaging Layout for Slim High-Resolution Cameras
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Solution Overview
Problem
The challenge of integrating high-resolution cameras into portable electronic devices is the conflict between achieving a short total optical length and maintaining high resolution, which is exacerbated by the slimming design of these devices.
Innovation Solution
An optical imaging system comprising five lenses, each with specific refractive powers and surface configurations, adhering to conditional expressions that ensure a compact design while optimizing focal lengths, field of view, and aberration correction, utilizing plastic materials and aspherical lenses to achieve a slim size and high performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the total optical length is increased to achieve high resolution, then the resolution is improved, but the device thickness increases which contradicts the slimming design requirement
Solution Approach 1:
The optical system is divided into five distinct lens groups with alternating positive and negative refractive powers. This segmentation allows each lens to contribute differently to the overall optical performance, enabling high resolution while maintaining a compact total optical length through optimized distribution of optical functions across multiple elements.
Solution Approach 2:
The patent employs specific conditional expressions that define optimal ranges for key parameters including TTL/(2×IMG HT)≤0.57, FOV/(2×IMG HT)/f≥0.2, and Fno×{TTL/(2×IMG HT)}≤1.4. These parameter optimizations enable the system to achieve high resolution with a shortened total optical length by precisely controlling the relationship between optical path length, field of view, and focal ratio.
2Measurement precision
If more lens elements are added to improve resolution and aberration correction, then the optical performance is improved, but the device complexity and size increase
Solution Approach 1:
The optical system is divided into five distinct lens groups with alternating positive and negative refractive powers. This segmentation allows each lens to contribute differently to the overall optical performance, enabling high resolution while maintaining a compact total optical length through optimized distribution of optical functions across multiple elements.
Solution Approach 2:
Each lens element is designed with specific local characteristics including alternating refractive powers (+, -, +, -, -), specific surface curvatures (convex or concave object-side surfaces), and material properties (Abbe numbers). This local optimization of each element's properties enables effective aberration correction and high resolution without requiring excessive complexity in the overall system design.
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 slim size with high resolution and appropriate brightness, field of view, and effective aberration correction, suitable for front cameras in mobile devices.
Implementation Method 1
An optical imaging system may include a first lens, a second lens, a third lens, a fourth lens, and a fifth lens disposed in order from an object side
Data Source
AI summary
An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens disposed in order from an object side, wherein a conditional expression TTL/(2*IMG HT)≤0.57 is satisfied, where TTL is a distance along an optical axis from an object-side surface of the first lens to an image plane, and IMG HT is half a diagonal length of the image plane.