Light Source Device Fly-Eye Integrator Light Utilization
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Solution Overview
Problem
Conventional light source devices using fly-eye integrators face inefficiencies in light utilization due to limited acceptance angles, resulting in a significant portion of light from LEDs being unable to enter the integrator, thus reducing the overall light utilization efficiency.
Innovation Solution
A light source device configuration that includes a collimating optical system, a condensing optical system, and a fly-eye integrator, where the virtual secondary light source's width is optimized to match the secondary light source's width, allowing light to be incident within the effective acceptance angle of the fly-eye integrator, thereby increasing the amount of light accepted and utilized.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the incident angle of all light on the light incident surface of the fly-eye integrator is made significantly smaller than the maximum effective acceptance angle, then all light can be guided into the fly-eye integrator, but the amount of light accepted into the fly-eye integrator decreases
Solution Approach 1:
The patent changes the angular distribution parameters of the light beam by optimizing the collimating optical system. Specifically, it controls the half-angle of the light beam exiting the collimating optical system to be substantially equal to the maximum effective acceptance angle of the fly-eye integrator, thereby maximizing light acceptance while maintaining guidance reliability
Solution Approach 2:
The patent performs preliminary collimation of the light beam from LEDs before it reaches the fly-eye integrator. By pre-adjusting the light beam's angular distribution through the collimating optical system, the light is prepared to match the acceptance characteristics of the fly-eye integrator, ensuring maximum light transfer efficiency
2Loss of energy
If the width of the virtual secondary light source is optimized to match the secondary light source width, then light utilization efficiency increases, but the device complexity increases due to precise optical system design requirements
Solution Approach 1:
The patent optimizes the width parameter of the virtual secondary light source by adjusting the collimating optical system's characteristics. Specifically, it sets the half-angle of the light beam to match the maximum effective acceptance angle, creating an optimal match between the light source characteristics and the fly-eye integrator's acceptance properties
Solution Approach 2:
The patent creates a virtual secondary light source that replicates the angular distribution characteristics of the actual light beam. This virtual representation allows for precise optimization of light matching without requiring complex physical adjustments, simplifying the design process while maximizing light utilization
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
This configuration enhances the light utilization efficiency by ensuring that a larger amount of light from the LEDs is effectively accepted into the fly-eye integrator, improving the overall output of the light source device without reducing efficiency.
Implementation Method 1
a collimating optical system that is disposed corresponding to the plurality of LEDs and on which light exiting from the plurality of LEDs is incident
Implementation Method 2
a condensing optical system that condenses light exiting from the collimating optical system
Data Source
AI summary
A light source device includes a plurality of LEDs, a collimating optical system disposed corresponding to the plurality of LEDs, a condensing optical system that condenses light exiting from the collimating optical system, and a fly-eye integrator into which the light exiting from the condensing optical system is incident. Assuming that parallel light is defined as a virtual secondary light source, the parallel light being obtained from light traveling from a virtual primary light source disposed at a back focus position of the condensing optical system toward the condensing optical system with a maximum effective acceptance angle of the fly-eye integrator as a divergence angle and then passing through the condensing optical system, the virtual secondary light source has a width that substantially coincides with a width of a secondary light source determined according to a shape of a light exit surface of the collimating optical system.