Optical Device Dual Reflector Surfaces Backward Light
Solution Overview
Problem
Existing optical devices for modifying light distribution patterns of light sources, such as LEDs, often result in unwanted light being directed backwards due to the geometry of the reflector surfaces, which can be mitigated but at the cost of increased attenuation or higher device height.
Innovation Solution
An optical device with two reflector surfaces, where the first reflector surface is farther from the light source than the second, allowing for a propagation passage for the second part of the light beams, reducing the need for a taller device and minimizing backward light direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a single reflector surface is used to redirect light beams, then the device height can be reduced, but backward light emission increases due to the geometry of the reflector surface
Solution Approach 1:
The single reflector surface is segmented into two distinct reflector surfaces (first and second reflector surfaces) positioned at different locations. The first reflector surface redirects light beams to a first target area while the second reflector surface redirects light beams to a second target area, thereby reducing backward light emission while maintaining a compact device height.
2Object-generated harmful factors
If the reflector surface is positioned higher to capture all light radiated to the second geometric quarter-space, then backward light emission is reduced, but the device height increases
Solution Approach 1:
Instead of positioning a single reflector surface higher in the vertical dimension, the solution introduces a second reflector surface positioned at a different horizontal location. This dimensional shift allows light beams to be redirected effectively without increasing the overall device height, while still capturing light that would otherwise cause backward emission.
3Object-generated harmful factors
If the lens-section is made thicker to avoid the near-vertical surface, then backward light emission is reduced, but light attenuation increases
Solution Approach 1:
The optical device is segmented into a lens-section and two separate reflector surfaces. This segmentation allows the lens-section to remain relatively thin while the reflector surfaces are positioned to effectively redirect light beams, thereby reducing backward light emission without increasing light attenuation through excessive lens thickness.
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 dual reflector surfaces effectively redirect light without excessive attenuation, ensuring more uniform light distribution on the target area while minimizing backward light emission.
Implementation Method 1
a first cavity for the light source, a second cavity whose surface constitutes the first reflector surface so that total internal reflection takes place when the first part of the second light beams arrive, from inside the transparent piece, at the surface of the second cavity
Implementation Method 2
a third cavity whose surface constitutes the second reflector surface so that total internal reflection takes place when the second part of the second light beams arrive, from inside the transparent piece, at the surface of the third cavity
Implementation Method 3
a lens-section for acting as a lens for modifying a light distribution pattern of the first light beams
Data Source
Figure 1a~1d
Figure 1e~1f
Figure 2a
AI summary
An optical device (201 ) for modifying a light distribution pattern of a light source (202) is presented. The light source radiates first light beams to a first geometric quarter-space and second light beams to a second geometric quarter-space, where the first and second quarter-spaces are defined by mutually perpendicular geometric planes one of which constitutes a boundary between the first and second geometric quarter-spaces. The optical device comprises a lens-section (207) for modifying a light distribution pattern of the first light beams and two reflector surfaces (208, 21 1 ) for reflecting the second light beams from the second geometric quarter-space to the first geometric quarter-space. The two reflector surfaces are successively in a direction (x) perpendicular to the boundary between the first and second geometric quarter-spaces and make it possible that the optical device can be lower than in a case where only one reflector surface is used.