Optical beam shaping device and spot light using the same
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Solution Overview
Problem
Standard total inner reflection Fresnel (TIRF) lenses are optimized for point-like light sources and fail to efficiently utilize extended light sources, leading to light leakage and reduced beam intensity due to inability to control all light effectively.
Innovation Solution
Incorporating a peripheral element that reflects internally reflected light back towards the optical direction, enhancing the collimation efficiency of the optical device, which includes a Fresnel portion with teeth and a central portion, allowing for a more compact design that can handle extended light sources without significant loss of light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If standard TIRF lenses are used with extended light sources, then the device can accommodate larger light sources, but light leakage occurs and beam intensity is reduced
Solution Approach 1:
The lens is divided into distinct functional zones: a central region for primary light collection and a peripheral region with reflective elements for light redirection. This segmentation allows each zone to optimize its function - the central region handles direct collimation while the peripheral region recovers leaked light, resolving the contradiction between accommodating extended sources and preventing light loss
Solution Approach 2:
The peripheral reflective elements capture light that would otherwise be lost through leakage and redirect it back into the collimated beam path. By converting the harmful effect of light leakage into a beneficial light recovery mechanism, the system maintains high beam intensity while supporting extended light sources
2Productivity
If TIRF lens design is modified to handle extended light sources, then light control improves, but lens thickness increases
Solution Approach 1:
The collimating function and light redirection function are merged into a single integrated lens structure. The peripheral reflective elements are incorporated directly into the lens body, eliminating the need for separate thick optical components while maintaining effective light control across the extended source area
Solution Approach 2:
Instead of increasing thickness in the axial dimension to improve light control, the solution uses radial dimensionality by adding peripheral reflective elements at the lens edge. This allows enhanced light management functionality without compromising the compact axial profile of the lens
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 device achieves a higher intensity collimated output beam by redirecting previously lost light, resulting in a more efficient and robust lighting solution suitable for a wider range of applications with extended light sources.
Implementation Method 1
The Fresnel portion includes at least one tooth for deflecting light
Implementation Method 2
light internally reflected by total inner reflection at the forward surface
Implementation Method 3
reflect light internally reflected by total inner reflection at the forward surface towards the optical direction
Data Source
Figure 1a~1b
Figure 2a~2b
Figure 3~4
AI summary
An optical device that allows the usage of an extended light source in a more compact device is provided. The optical device may be configured to collimate light of a light source (270) along an optical direction. The optical device (200) may comprise a source surface (215), a forward surface (210), a lens body (250) and a peripheral element (240). The source surface is arranged to receive light and may comprise a central portion (220) and a Fresnel portion (230). The Fresnel portion includes at least one tooth (233n) for deflecting light. The forward surface is arranged to output, along the optical direction, at least the deflected light into a collimated light. The source surface and the forward surface delimit the lens body. The peripheral element may be arranged to reflect light internally reflected at the forward surface by total inner reflection towards the optical direction to contribute to the collimated light.