Aspherical Fluorescence Lens Layout for Compact Endoscope Imaging
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Solution Overview
Problem
Conventional endoscopes rely solely on morphological observation, necessitating biopsies for precise diagnosis, which can cause wounds and bleeding, and lack optimized optical lenses for fluorescence imaging.
Innovation Solution
An ultra-compact lens system with three lenses, each with specific aspherical surfaces and refractive powers, designed to minimize light loss and provide high-resolution fluorescence imaging, using band-pass filter coating to optimize wavelength transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional endoscopes use morphological observation only, then device complexity is low, but measurement precision for cancer diagnosis is insufficient
Solution Approach 1:
The patent combines multiple optical lenses (first lens with negative refractive power, second lens with positive refractive power, and third lens with negative refractive power) into a single integrated lens system. This merging of optical components enables fluorescence imaging capability for precise cancer diagnosis while maintaining a compact structure suitable for endoscopic application.
Solution Approach 2:
The patent employs aspherical surfaces on all lens surfaces (first surface, second surface, third surface, fourth surface, fifth surface, and sixth surface) to correct optical aberrations. The aspherical design improves measurement precision for fluorescence imaging by reducing distortion and enhancing image quality, while the specific curvature configurations maintain a compact overall structure.
2Measurement precision
If optical lens performance is improved through proper F-number and focal length adjustment, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent specifies precise parameter ranges for the optical system: the first lens has negative refractive power with focal length f1, the second lens has positive refractive power with focal length f2, and the third lens has negative refractive power with focal length f3. The F-number is controlled within 2.0 to 4.0, and the focal length is optimized to achieve high-resolution fluorescence imaging. These parameter optimizations improve measurement precision while the systematic approach keeps design complexity manageable.
3Volume of moving object
If a compact lens system is designed with three lenses, then device size is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent designs all six surfaces of the three lenses as aspherical surfaces with specific curvature configurations. The first lens has a concave first surface and convex second surface, the second lens has convex third and fourth surfaces, and the third lens has concave fifth and sixth surfaces. These aspherical designs enable compact lens system volume while the systematic curvature specifications provide clear manufacturing guidance to manage precision requirements.
4Measurement precision
If band-pass filter coating is applied to optimize wavelength transmission, then measurement precision improves, but manufacturing cost increases
Solution Approach 1:
The patent applies band-pass filter coating to specific surfaces (seventh surface and/or eighth surface) rather than all surfaces uniformly. This localized coating approach optimizes wavelength transmission for fluorescence imaging at the critical interfaces where it provides the greatest benefit, while reducing unnecessary coating processes elsewhere, thereby balancing measurement precision improvement with manufacturing ease.
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
Enables precise cancer diagnosis with reduced light loss and production costs, allowing wide-angle imaging and application in disposable endoscopes and optical imaging devices.
Implementation Method 1
The first lens has a Meniscus shape including first and second surfaces facing each other. The first surface is concave, and each of the first and second surfaces is an aspherical surface. The second lens is adjacent to the first lens and includes third and fourth surfaces facing each other. Each of the third and fourth surfaces is convex and aspherical surface.
Implementation Method 2
using band-pass filter coating to optimize wavelength transmission
Data Source
AI summary
An ultra-compact lens system for fluorescence imaging includes a first lens, a second lens and third lens. The first lens has a Meniscus shape including first and second surfaces facing each other. The first surface is concave, and each of the first and second surfaces is an aspherical surface. The second lens is adjacent to the first lens and includes third and fourth surfaces facing each other. Each of the third and fourth surfaces is convex and aspherical surface. The third lens is adjacent to the second lens and includes fifth and sixth surfaces facing each other. Each of the fifth and sixth surfaces is concave and aspherical surface.