Light Source Apparatus Irradiating Phosphor Layer Both Sides
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Solution Overview
Problem
Existing light source apparatuses for projectors require multiple components and a complex structure to effectively use excitation light, leading to increased size and reduced efficiency in outputting high-luminance light, as they necessitate both primary and secondary excitation light sources and additional optical components like lenses and mirrors.
Innovation Solution
A light source apparatus with a phosphor layer that receives excitation light from both sides, utilizing a reflection element and a light guide section to efficiently direct and reflect excitation light, allowing both sides of the phosphor layer to be irradiated without a complex structure, thereby simplifying the configuration and increasing luminance output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a second light source and excitation light reflection mirror are added to irradiate both sides of the phosphor layer, then the luminance output is improved, but the device complexity and size increase
Solution Approach 1:
The patent combines the functions of the first and second light sources into a single light source device with multiple light emitting regions. The first light emitting region provides primary excitation light, while the second light emitting region provides secondary excitation light that is reflected by the reflection mirror to irradiate the phosphor layer from the opposite side, eliminating the need for separate light source apparatuses
Solution Approach 2:
The light source device serves multiple functions: it generates both primary and secondary excitation light, the reflection mirror both reflects secondary excitation light and transmits the emitted light from the phosphor layer, and the single light source device replaces what would traditionally require two separate light source apparatuses
2Use of energy by moving object
If a lens and excitation light reflection mirror are added to guide secondary excitation light, then the excitation light utilization is improved, but the device complexity increases
Solution Approach 1:
The patent integrates the light guiding function into the existing optical path without requiring additional complex light guiding components. The reflection mirror is strategically positioned to both reflect secondary excitation light onto the phosphor layer and transmit the emitted light toward the optical system, combining multiple functions in a single component
3Quantity of substance
If an excitation light transmitting portion is created in the reflection mirror, then the secondary excitation light transmission is improved, but the excitation light loss increases
Solution Approach 1:
The reflection mirror is designed with differentiated regions: an excitation light reflecting portion that reflects primary excitation light back onto the phosphor layer, and an excitation light transmitting portion that allows secondary excitation light to pass through. This local differentiation optimizes the function of each region while minimizing overall energy loss
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 solution enables a compact, efficient, and high-luminance light output with reduced component count, effectively using excitation light to produce light of a specific wavelength band, such as white, red, or green light, while maintaining stability through thermal contact and efficient heat dissipation.
Implementation Method 1
a phosphor layer that is so provided that the phosphor layer coincides with the first light emitting region in a plan view and emits light of a second wavelength band different from the first wavelength band when irradiated with first excitation light
Implementation Method 2
a reflection element that is provided on the opposite side of the phosphor layer to the light emitting device, transmits light of the second wavelength band, and reflects light of the first wavelength band
Data Source
AI summary
A light source apparatus includes a light emitting device that has a first light emitting region outputting first excitation light and a second light emitting region outputting second excitation light, a phosphor layer that is so provided that the phosphor layer coincides with the first light emitting region in a plan view and emits fluorescence light, a reflector that is provided on the opposite side of the phosphor layer to the light emitting device, transmits the fluorescence light, and reflects the excitation light, and a light guide section that is disposed on an optical path between the phosphor layer and the reflector, and guides the second excitation light reflected off the reflector such that at least part of the reflected second excitation light enters the phosphor layer.