Acute-Angle Filter for Laser Illumination Heat Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In laser projectors, the unextracted light reflected by the filter element can cause temperature rises in the phosphor layer, leading to reduced conversion efficiency and potential damage, resulting in poor reliability and failure over time.
Innovation Solution
An illumination system with a wavelength conversion element and a filter element where the transmission path of the converted beam is perpendicular to a reference plane, forming an acute angle with the filter element, preventing the reflected light from being transmitted back to the wavelength conversion region, thus avoiding heat-induced efficiency reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the filter element is disposed perpendicular to the transmission path of the converted beam, then the reflected light can be easily extracted, but the reflected light will be transmitted back to the wavelength conversion region causing temperature rise and efficiency reduction
Solution Approach 1:
The filter element is disposed at an acute angle relative to the transmission path of the converted beam rather than perpendicular. This angular arrangement in a different dimensional orientation causes reflected light to diverge away from the wavelength conversion region, preventing temperature rise while maintaining effective light extraction.
2Productivity
If the filter element reflects more unextracted light, then more light can be extracted for use, but the reflected light returns to the phosphor layer causing temperature rise and potential damage
Solution Approach 1:
The filter element is positioned at an asymmetric acute angle to the beam transmission path. This asymmetric configuration ensures that reflected light follows a divergent path away from the wavelength conversion region, allowing high light extraction while preventing heat accumulation that would occur with symmetric perpendicular positioning.
3Loss of energy
If the filter element is positioned to maximize light extraction, then optical efficiency improves, but the reflected light path intersects with the incoming beam path causing heat buildup
Solution Approach 1:
By positioning the filter element at an acute angle rather than perpendicular to the transmission path, the solution utilizes angular dimensionality to separate the reflected light path from the incoming beam path. This dimensional change maximizes light extraction efficiency while directing reflected light away from the phosphor layer, preventing temperature buildup.
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 reliability and optical efficiency of the illumination system and projection apparatus by preventing heat buildup and maintaining conversion efficiency.
Implementation Method 1
the wavelength conversion region is excited by the excitation beam to emit a converted beam
Implementation Method 2
the filter element allows a part of the converted beam to penetrate so as to output at least one color beam, and reflects another part of the converted beam
Data Source
AI summary
An illumination system including an excitation light source, a wavelength conversion element and a filter element is provided. The excitation light source is used for emitting an excitation beam. The wavelength conversion element has a wavelength conversion region. When the wavelength conversion region is cut into a transmission path of the excitation beam, the wavelength conversion region is excited by the excitation beam and emits a converted beam. A reference plane is perpendicular to the transmission path of the converted beam and is angled such that an acute angle is formed between the reference plane and the filter wheel which is disposed on a transmission path of the converted beam coming from the wavelength conversion element. The filter element allows a part of the converted beam to penetrate so as to output at least one color beam, and reflects another part of the converted beam.