Fresnel Lens Light Source for Endoscope Luminance
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Solution Overview
Problem
Traditional light source devices, including LED-based systems, face challenges in achieving luminance comparable to traditional sources and efficiently guiding multiple light beams through a single light guide, particularly in medical and industrial applications where high-quality imaging is required.
Innovation Solution
A light source device utilizing a pair of Fresnel lenses with corrugated surfaces to concentrate light beams, which are then guided through a single light guide, and a system incorporating multiple light sources with different wavelengths and corresponding concentrators, a beam splitter, and a light guide to collimate and combine light beams for enhanced imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If LED light sources with Lambertian-distributed light are used, then the device complexity is reduced compared to traditional light sources, but the luminance achievable is insufficient compared to traditional light sources
Solution Approach 1:
The patent employs two Fresnel lenses with curved corrugated surfaces to concentrate LED light. The spherical curvature of the lens surfaces enables efficient light concentration from the Lambertian-distributed LED source, achieving high luminance output while maintaining the simplicity of LED technology.
Solution Approach 2:
The patent transforms the light distribution parameters by using Fresnel lenses to convert the wide-angle Lambertian distribution into a concentrated beam. This parameter transformation enables the LED to achieve luminance levels comparable to traditional light sources while keeping the device structure simple.
2Adaptability or versatility
If multiple light beams with different wavelengths are combined through one light guide, then the versatility is improved for photodynamic diagnosis and therapy, but the device complexity increases
Solution Approach 1:
The patent combines multiple light beams with different wavelengths from separate LED sources into a single light guide using beam combining optics. This merging approach enables versatile applications in both photodynamic diagnosis and therapy while maintaining a compact integrated structure rather than separate systems.
Solution Approach 2:
The patent creates a universal light source system that can perform both photodynamic diagnosis and therapy functions through a single integrated device. The system uses multiple LED sources with different wavelengths that can be independently controlled to serve different medical functions, eliminating the need for separate diagnostic and therapeutic equipment.
3Manufacturing precision
If conventional lenses are used to concentrate LED light, then the manufacturing precision is easier to achieve, but the luminance output is insufficient
Solution Approach 1:
The patent uses Fresnel lenses with curved corrugated surfaces that are easier to manufacture than conventional spherical lenses while achieving superior light concentration. The stepped corrugated structure approximates the ideal curved surface, providing high luminance output with simplified manufacturing processes suitable for mass production.
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 solution enables the efficient guidance of light beams from LED sources with specific directivity angles, improving image sharpness and quality in endoscopic and medical applications, and is applicable to both photodynamic diagnosis and therapy.
Implementation Method 1
a concentrator including a pair of Fresnel lenses with corrugated surfaces and concentrating the emitted light beam
Implementation Method 2
a concentrator including a pair of Fresnel lenses with corrugated surfaces and concentrating the emitted light beam
Implementation Method 3
a light guide guiding the concentrated light beam
Data Source
AI summary
The invention provides medical or industrial light source devices, for example, an endoscope.A light source device includes:a light source emitting a light beam;a concentrator including a pair of Fresnel lenses with corrugated surfaces and concentrating the emitted light beam, the corrugated surfaces of the Fresnel lenses facing each other, anda light guide guiding the concentrated light beam.The corrugated surfaces of the pair of Fresnel lenses may be in contact with each other and one end of the light guide may be disposed at a focal point of the concentrated light beam.