Five-Lens Optical Imaging System for Low Distortion and High Brightness
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Solution Overview
Problem
Existing optical imaging systems, particularly those using Time of Flight (TOF) technology, face challenges in achieving low distortion, high brightness, miniaturization, and large aperture while maintaining effective image quality.
Innovation Solution
The optical imaging system comprises five lenses, carefully configured with specific refractive powers, surface types, and center thicknesses, along with optimized axial spaced intervals, to achieve the desired optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional two-dimensional imaging lens assemblies are used, then the structure is simple, but the distortion is high and image quality is poor
Solution Approach 1:
The optical imaging system is divided into five separate lens elements (first lens L1, second lens L2, third lens L3, fourth lens L4, and fifth lens L5) arranged in sequence along the optical axis. Each lens element has specific refractive power and surface curvature characteristics that work together to reduce distortion and improve image quality while maintaining a manageable structural complexity
Solution Approach 2:
Each lens element is designed with specific local optical properties: the first lens has positive refractive power with convex object-side surface, the second and third lenses have negative refractive power, the fourth lens has positive refractive power with concave object-side surface, and the fifth lens has negative refractive power. These localized optical characteristics are optimized to collectively reduce distortion and improve image quality
2Illumination intensity
If the aperture is increased to improve brightness, then the brightness increases, but the distortion increases
Solution Approach 1:
The patent optimizes multiple parameters including the refractive powers of each lens element, the axial distances between lenses (T12, T23, T34, T45), the center thicknesses of lenses (CT1, CT2, CT3, CT4, CT5), and the radii of curvature of lens surfaces. These parameter changes are specifically designed to maintain low distortion while achieving high brightness through large aperture
Solution Approach 2:
The optical system uses a dynamic combination of positive and negative refractive powers across the five lens elements, allowing the system to adaptively control light paths to minimize distortion across different aperture settings while maintaining high brightness performance
3Volume of moving object
If the lens assembly is miniaturized to reduce size, then the compactness increases, but the optical performance deteriorates
Solution Approach 1:
The five lens elements are arranged in a compact nested configuration along the optical axis with optimized axial distances (T12, T23, T34, T45) between them. This nesting approach allows the lens assembly to achieve miniaturization while maintaining the necessary optical path lengths and element spacing for high-performance imaging
Solution Approach 2:
The patent optimizes the axial distances and spacing between lens elements in the optical axis dimension to achieve compactness, while the lens surfaces utilize curved geometries in radial dimensions to maintain optical performance. This multi-dimensional optimization enables miniaturization without sacrificing image quality
4Manufacturing precision
If the number of lenses is increased to reduce distortion, then the distortion decreases, but the device complexity increases
Solution Approach 1:
The patent merges multiple optical functions into a coordinated five-lens system where each lens element contributes specific corrective functions. The combination of positive and negative refractive power lenses works synergistically to reduce distortion, with the overall system complexity managed through optimized spacing and configuration rather than simple addition of elements
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
This configuration results in an optical imaging system with low distortion, high brightness, miniaturization, and large aperture, enhancing image quality and suitability for applications like face recognition, stereoscopic imaging, and somatosensory interaction.
Implementation Method 1
a first lens L1 having a positive refractive power, and an object-side surface S1 thereof may be convex; a second lens L2 having a refractive power; a third lens L3 having a refractive power; a fourth lens L4 having a positive refractive power
Data Source
AI summary
An optical imaging system includes, sequentially from an object side to an image side along an optical axis, a first lens (L1) having a positive refractive power and a convex object-side surface (S1); a second lens (L2) having a refractive power; a third lens (L3) having a refractive power; a fourth lens (L4) having a positive refractive power, a concave object-side surface (S7) and a convex image-side surface (S8); and a fifth lens (L5) having a negative refractive power.