Projector Light Source Device for Guided Fluorescence Utilization
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Solution Overview
Problem
The efficiency of fluorescence utilization in existing light source devices is compromised due to components leaking through the interface between the wavelength conversion member and the air layer, leading to reduced utilization of fluorescence.
Innovation Solution
A light source device with a configuration that includes multiple light sources and wavelength conversion elements, optical layers, and light guide portions, along with reflection members to guide and reflect light efficiently, ensuring maximum utilization of fluorescence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the wavelength conversion member has a flat plate shape with excitation light entered from a larger incident surface, then the light source device can be simplified in structure, but fluorescence leaks through the interface between the wavelength conversion member and air layer, reducing fluorescence utilization efficiency
Solution Approach 1:
A light guide plate is introduced as an intermediary component between the wavelength conversion member and the external environment. The light guide plate has a smaller extraction surface area than the wavelength conversion member, serving as a mediator that confines fluorescence within a controlled extraction region while allowing the wavelength conversion member to maintain its large incident surface for excitation light entry. This resolves the contradiction by preventing fluorescence leakage through the air interface while preserving the simplified flat plate structure.
Solution Approach 2:
The solution transitions from a two-dimensional flat plate configuration to a three-dimensional structured arrangement by adding the light guide plate with specific geometric features (smaller extraction surface, light-guiding sides). This dimensional change allows the system to maintain the large incident surface area for excitation light while creating a controlled light extraction path, thereby preventing fluorescence leakage without complicating the overall structure.
2Reliability
If fluorescence is totally reflected at the interface between the wavelength conversion member and air layer, then fluorescence can propagate inside the wavelength conversion member, but components entering at angles smaller than the critical angle leak to the outside, reducing use efficiency
Solution Approach 1:
The light guide plate acts as an intermediary that replaces the air layer interface. By having the light guide plate's extraction surface smaller than the wavelength conversion member, it creates a controlled interface that prevents fluorescence leakage. The light guide plate mediates between the need for total internal reflection (for reliable propagation) and the need to extract fluorescence efficiently, solving the contradiction by confining fluorescence within the light guide plate's boundaries while maintaining reliable propagation through the wavelength conversion member.
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 conversion and emission by minimizing losses through guided and reflected light paths, thereby improving the overall performance of the light source device.
Implementation Method 1
a first optical layer disposed between the first light source and the first wavelength conversion element and transmitting the first light and reflecting the second light
Implementation Method 2
a first wavelength conversion element converting the first light into a second light in a second wavelength range different from the first wavelength range
Implementation Method 3
the fluorescence generated inside the wavelength conversion member is totally reflected at an interface between the surface of the wavelength conversion member and an air layer to thereby propagate inside the wavelength conversion member
Data Source
AI summary
A light source device of the present disclosure includes a first light source emitting a first light, a first wavelength conversion element converting the first light into a second light, a first optical layer transmitting the first light and reflecting the second light, a first light guide portion guiding the second light, a second light source e emitting a third light, a second wavelength conversion element converting the third light into a fourth light, a second optical layer transmitting the third light and reflecting the fourth light, a second light guide portion guiding the fourth light, and a first reflection member. The second wavelength conversion element is disposed at a side opposite to the first light source with respect to the first wavelength conversion element. The second light travels through the first light guide portion and is emitted from a region of the first light guide portion at a third surface side, and the fourth light travels through the second light guide portion and is emitted from a region of the second light guide portion at a sixth surface side.