Six-Element Optical Lens Assembly for Thermal Stability and Wide-Angle Imaging
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Solution Overview
Problem
Existing optical lens assemblies face challenges with focal plane variation due to different wavelengths and environmental temperature changes, affecting optical quality and size constraints in miniaturized projection lenses.
Innovation Solution
The optical lens assembly design includes a specific arrangement of lens elements with concave-convex curved surfaces and refracting powers, adhering to the EFL/BFL≥3.800 condition, ensuring good thermal stability and enabling passage of light with different wavelengths while maintaining optical quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the optical lens assembly is miniaturized, then the size is reduced, but the field of view and optical quality deteriorate
Solution Approach 1:
The optical lens assembly is divided into six lens elements with different refracting powers and surface configurations. Each lens element contributes to specific optical functions, allowing the system to achieve a large field of view while maintaining a compact overall size. The segmentation enables complex optical corrections to be distributed across multiple elements rather than requiring a single large element.
Solution Approach 2:
The patent employs asymmetric surface configurations where periphery regions of lens surfaces have different curvatures than central regions. This dimensional variation across the lens surface allows for expanded field of view coverage while keeping the physical lens size small, effectively utilizing surface geometry in multiple dimensions to solve the size-FOV tradeoff.
2Manufacturing precision
If the focal length is increased to improve imaging quality, then the optical quality is improved, but the size of the lens assembly increases
Solution Approach 1:
The patent satisfies the conditional expression EFL/BFL≥3.800, where EFL is effective focal length and BFL is back focal length. This parameter relationship allows the system to achieve adequate effective focal length for good optical quality while maintaining a short back focal length that keeps the overall assembly size small. The specific refractive index and curvature parameters of each lens element are optimized to meet this condition.
3Adaptability or versatility
If the lens assembly is designed for wide field of view, then the field of view is increased, but the thermal stability and optical quality across wavelengths deteriorate
Solution Approach 1:
Different lens elements are assigned different refracting powers (positive or negative) and surface configurations (convex or concave periphery regions) to address specific optical issues. For example, elements with negative refracting power help correct chromatic aberrations, while elements with positive refracting power contribute to thermal stability. This localized optimization of each element's properties enables the system to maintain thermal stability and optical quality across wavelengths while achieving a wide field of view.
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 design achieves a small size, large field of view, and good thermal stability with maintained optical quality, allowing for effective projection and imaging across varying temperatures.
Implementation Method 1
Each of the first lens element to the sixth lens element includes a first side surface facing the first side and allowing imaging rays to pass through, and a second side surface facing the second side and allowing imaging rays to pass through
Implementation Method 2
The projection lens uses a light source to project an image through an optical lens assembly
Data Source
AI summary
An optical lens assembly is provided, including a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, and a sixth lens element sequentially along an optical axis from a first side to a second side. The optical lens assembly satisfies a conditional expression of EPL/BFL≥3.800.