Light Source Device Wavelength Conversion Efficiency via Asymmetric Ray Segmentation
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Solution Overview
Problem
In projector light source devices, the inefficiency in using excitation light for wavelength conversion occurs due to the arrangement of reflecting members around the phosphor layer, leading to a decrease in the use efficiency of excitation light.
Innovation Solution
A light source device with a light source emitting multiple pencils of light, optical elements to alter the direction of principal rays, and a wavelength conversion layer with specific side surfaces for reflecting light, ensuring that all pencils contribute to wavelength conversion without overlapping on the plane of incidence, thereby increasing the excitation light's use efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the excitation light irradiation area is made larger than the fluorescence emitting area, then the coverage of excitation light is improved, but the use efficiency of excitation light decreases due to parts failing to contribute to wavelength conversion
Solution Approach 1:
The patent divides the excitation light into multiple pencils (first pencil, second pencil, third pencil, fourth pencil) with different incident directions. Each pencil is directed to enter the wavelength conversion layer from specific surfaces (front surface, side surfaces, or back surface), ensuring that all excitation light contributes to wavelength conversion by segmenting the light path and preventing overlap on the plane of incidence.
Solution Approach 2:
The patent introduces multiple incident directions (front, side, back) to illuminate the wavelength conversion layer from different spatial dimensions. By arranging optical elements to emit pencils from multiple directions, the system maximizes the utilization of the wavelength conversion layer's surface area without causing light overlap, thereby improving energy efficiency.
2Illumination intensity
If reflecting members are arranged around the phosphor layer, then light extraction is improved, but the use efficiency of excitation light decreases due to parts failing to be used for wavelength conversion
Solution Approach 1:
The patent applies different functions to different surfaces of the wavelength conversion layer: the front surface receives the first pencil, side surfaces receive the second and third pencils, and the back surface receives the fourth pencil. This localized illumination approach ensures that each surface area is optimized for its specific function, preventing light overlap and maximizing wavelength conversion efficiency while maintaining light extraction.
3Area of stationary object
If multiple pencils are emitted from the light source, then the coverage of excitation light is improved, but the principal rays may overlap on the plane of incidence causing inefficiency
Solution Approach 1:
The patent employs asymmetric arrangement of optical elements to emit pencils at specific angles (first direction, second direction, third direction, fourth direction) rather than symmetric arrangements. This asymmetric configuration ensures that principal rays from different pencils do not overlap on the plane of incidence, maximizing the effective area covered while preventing energy loss from overlapping light paths.
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 enhances the wavelength conversion efficiency by ensuring all excitation light contributes to the process, preventing inefficiencies and increasing light density on the wavelength conversion layer.
Implementation Method 1
a wavelength conversion layer... configured to perform wavelength conversion of the first pencil and the second pencil into fluorescence having a second wavelength band different from the first wavelength band
Implementation Method 2
the first pencil is reflected by the first reflecting element to enter the wavelength conversion layer from the first side surface
Implementation Method 3
the second pencil is reflected by the second reflecting element to enter the wavelength conversion layer from the second side surface
Data Source
AI summary
A light source device according to the present disclosure includes a light source section for emitting a first pencil and a second pencil, a first optical element for altering a proceeding direction of a principal ray of the first pencil, a second optical element for altering a proceeding direction of a principal ray of the second pencil, a wavelength conversion layer having a plane of incidence, a reflecting surface, a first side surface, and a second side surface, a first reflecting element having a first reflecting surface, and a second reflecting element having a second reflecting surface.