Light Source Apparatus Fluorescence Extraction via 3D Spacing
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Solution Overview
Problem
Existing light source apparatuses face issues with decreased fluorescence extraction efficiency due to the collimator lens's inability to capture fluorescence emitted at large angles and increased thermal density leading to reduced light emission efficiency.
Innovation Solution
A light source apparatus with a first laser light emitter, a wavelength converter, a base with separate support parts for the emitter and converter, a light transmissive member with reflectors, and a light collection optical element, where the distance between the wavelength converter and the light collection optical element is shorter than between the laser light emitter and the light collection optical element, and the light transmissive member suppresses fluorescence spreading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the phosphor is disposed farther from the collimator lens to accommodate excitation light sources, then the excitation light sources can be positioned, but the collimator lens cannot capture fluorescence emitted at large angles, decreasing fluorescence extraction efficiency
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement to a three-dimensional configuration by positioning the light collection optical element above the phosphor layer at an optimized distance, enabling capture of fluorescence emitted at various angles including large angles, thereby resolving the contradiction between accommodating excitation light sources and maintaining high fluorescence extraction efficiency
Solution Approach 2:
The patent introduces a light collection optical element as an intermediary component between the phosphor and the collimator lens, which captures fluorescence emitted at large angles and directs it toward the optical path, thus improving fluorescence extraction efficiency without compromising the positioning of excitation light sources
2Device complexity
If the excitation light sources and phosphor are disposed at the same support surface, then the structure is simplified, but the heat increases the thermal density of the substrate, decreasing light emission efficiency
Solution Approach 1:
The patent segments the support structure into multiple levels or surfaces, positioning the excitation light sources and phosphor at different locations to reduce thermal density while maintaining structural integrity, thus resolving the contradiction between structural simplicity and light emission efficiency
Solution Approach 2:
The patent utilizes three-dimensional spatial arrangement by positioning components at different heights or depths rather than on the same plane, reducing thermal interference between excitation light sources and phosphor while maintaining a compact and relatively simple overall structure
3Productivity
If the distance between wavelength converter and light collection optical element is reduced, then fluorescence capture efficiency is enhanced, but the space allocation becomes more constrained
Solution Approach 1:
The patent optimizes the spatial arrangement by positioning the light collection optical element at an optimized distance above the wavelength converter in the vertical dimension, achieving high fluorescence capture efficiency while maintaining flexibility in horizontal space allocation for other components
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 fluorescence capture and extraction efficiency, reduces thermal density, and allows for a compact, high-luminance projector design.
Implementation Method 1
a wavelength converter configured to convert the first light into second light having a second wavelength band different from the first wavelength band
Implementation Method 2
a light collection optical element disposed at a second surface side of the light transmissive member and configured to collect light that is emitted from the wavelength converter and passes through the light transmissive member
Implementation Method 3
a first reflector disposed at the second surface of the light transmissive member and configured to reflect the first light emitted from the first laser light emitter toward the wavelength converter
Data Source
AI summary
A light source apparatus includes a first laser light emitter that emits first light, a wavelength converter that converts the first light into second light, a base including a first support part that supports the first laser light emitter, and a second support part that supports the wavelength converter, a light transmissive member that has first and second surfaces, the first light being incident on the first surface, a first reflector that is disposed at the second surface and reflects the first light toward the wavelength converter, and a light collection optical element that collects light emitted from the wavelength converter. A first distance along an optical axis of the light collection optical element between the wavelength converter and the light collection optical element is shorter than a second distance along the optical axis between the first laser light emitter and the light collection optical element.