Light Emitting Apparatus Laser Excitation Fluorescence Leakage
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Solution Overview
Problem
Existing light emitting apparatuses face inefficiencies in using fluorescence due to leakage through reflecting mirrors, as the optical path lengths in multilayer films are not accurately controlled, leading to suboptimal wavelength selectivity and reduced brightness.
Innovation Solution
Incorporating an optical functional member that transmits excitation light and reflects fluorescence, positioned to cover the light passage opening of the reflecting mirror, ensuring unidirectional fluorescence entry and maximizing the allowable deviation of the excitation light source's emission angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a light transmitting section (hole) is provided in the reflecting mirror to transmit excitation light, then the excitation light can reach the fluorescent material, but the diffused light generated by the fluorescent material leaks through the same opening, causing decreased efficiency in utilizing the generated light
Solution Approach 1:
The patent divides the optical functional requirements into separate components: the reflecting mirror handles excitation light transmission through its opening, while a dedicated wavelength-selective optical member (band-pass filter or long-pass filter) is positioned in the light path to selectively transmit or reflect the diffused light. This segmentation allows each component to optimize its function without interfering with the other, preventing light leakage while maintaining efficient excitation light transmission.
2Loss of energy
If a wavelength-selective reflecting mirror or band-pass filter is provided in the light transmitting section to prevent diffused light leakage, then light efficiency is improved, but the optical path lengths in multilayer films are not accurately controlled, leading to suboptimal wavelength selectivity and reduced brightness
Solution Approach 1:
The patent carefully controls critical parameters including the thickness of each layer in the multilayer film structure, the refractive indices of materials used, and the precise positioning of the optical functional member relative to the light emitting section. By optimizing these parameters, the patent achieves accurate optical path length control that enables both effective wavelength selection (preventing light leakage) and maintains high brightness output.
3Illumination intensity
If the excitation light source is positioned to maximize brightness, then illumination intensity is improved, but the allowable deviation of the excitation light source's emission angle is reduced, making alignment more critical and difficult
Solution Approach 1:
The patent designs the optical system with multi-functional components that can accommodate variations in alignment. The wavelength-selective optical functional member is positioned and configured to work effectively across a range of emission angles, and the reflecting mirror geometry is optimized to guide light effectively even when the excitation source position varies within acceptable tolerances. This makes the system more robust and easier to assemble while maintaining high brightness.
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
Enhances the efficiency of fluorescence usage, preventing leakage and maintaining brightness by ensuring the excitation light passes through the center of the light passage opening, thus optimizing the optical path lengths and wavelength selectivity.
Implementation Method 1
an optical functional member which transmits the excitation light and reflects the fluorescence
Implementation Method 2
a light emitting section which generates fluorescence in response to the excitation light
Data Source
AI summary
A light emitting apparatus includes: a laser element which emits laser light; a light emitting section which generates fluorescence in response to the laser light emitted from the laser element; a parabolic mirror which reflects the fluorescence generated by the light emitting section; and a multilayer filter which transmits the laser light and reflects the fluorescence, the laser element being provided outside the parabolic mirror, the parabolic mirror being provided with a window part through which the laser light passes, and the multilayer filter being provided so as to cover the window part.