Miniaturized Endoscopic Lens Assembly with Low Distortion
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Solution Overview
Problem
Conventional endoscopic devices with complex lens assemblies are unable to achieve miniaturization while maintaining low distortion and preferred relative illumination, limiting their application in minimally invasive surgeries.
Innovation Solution
A small-size optical imaging lens assembly comprising a first lens element with negative refracting power, a second lens element with positive refracting power, and a third lens element with positive refracting power, along with an aperture stop, which collectively provide a wide angle of view, low distortion, and improved relative illumination by optimizing curvature radii, refractive indices, and focal lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a conventional lens assembly is used to capture detection images, then the device can achieve stable imaging performance, but the device cannot achieve diameter miniaturization due to complicated lens assembly structure
Solution Approach 1:
The lens assembly is divided into three separate lens elements with specific refracting powers (first negative, second positive, third positive). Each lens element has specific surface curvature configurations that work together to achieve miniaturization while maintaining imaging performance. The segmentation allows each element to be optimized independently for size and optical function.
Solution Approach 2:
The patent specifies precise parameter ranges for the lens elements including curvature radius sums (3-3.2 mm for first element), refractive indices (1.5-1.7 for all elements), and focal length ratios (0.65-0.75). These parameter changes enable the compact design to achieve both small size and low distortion performance.
2Volume of moving object
If the lens assembly is miniaturized, then the device can achieve small size for minimally invasive surgery, but distortion performance and relative illumination deteriorate
Solution Approach 1:
Each lens element has specific local surface quality characteristics - the first element has a convex object-side surface and concave image-side surface, the second has convex object-side and concave image-side surfaces, and the third has convex surfaces on both sides. These localized surface quality variations correct distortion and spherical aberrations while maintaining compact size.
Solution Approach 2:
The patent establishes specific parameter ranges including curvature radius sums (3-3.2 mm), refractive indices (1.5-1.7), and focal length ratios (0.65-0.75) that optimize the balance between miniaturization and distortion correction, achieving low distortion performance in a compact configuration.
3Volume of moving object
If a compact lens assembly is designed, then the device can achieve miniaturization, but relative illumination and optical performance are compromised
Solution Approach 1:
The patent specifies refractive index ranges (1.5-1.7 for all elements) and focal length ratios (0.65-0.75) that optimize light transmission and distribution across the image plane. These parameter changes ensure uniform relative illumination while maintaining the compact lens assembly volume.
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 optical imaging lens assembly effectively corrects distortion and spherical aberrations, enabling a compact endoscopic optical device with enhanced optical performance and wide-angle viewing capabilities.
Implementation Method 1
The first lens element has negative refracting power, and further has a first convex object-side surface and a first image-side surface
Implementation Method 2
The second lens element has positive refracting power, and further has a second convex object-side surface and a second concave image-side surface
Implementation Method 3
The third lens element has positive refracting power, and further has a third convex image-side surface and a third object-side surface
Data Source
AI summary
An optical imaging lens assembly, which is applied for an endoscopic optical device, from an object side to an image side aligned in order includes a first lens element, a second lens element and a third lens element. The first lens element has negative refracting power, and further has a first convex object-side surface and a first image-side surface. The second lens element has positive refracting power, and further has a second convex object-side surface and a second concave image-side surface. The third lens element has positive refracting power, and further has a third convex image-side surface and a third object-side surface.