Projector Light Source Apparatus Phosphor Alignment
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Solution Overview
Problem
Existing light source apparatuses using fixed phosphors for projectors face issues with inefficient fluorescence conversion efficiency and potential breakage due to unwanted irradiation with excitation light, leading to reliability concerns.
Innovation Solution
A light source apparatus with a wavelength conversion element and a lens group that adjusts the position of the irradiation area relative to the light incident surface using pivotal mechanisms, ensuring efficient excitation light incidence and preventing irradiation of non-intended areas, thereby maintaining fluorescence conversion efficiency and preventing breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed phosphor is irradiated with excitation light, then the structure is simple and cost-effective, but the area other than the intended irradiation area is undesirably irradiated with excitation light
Solution Approach 1:
The phosphor layer is divided into a light incident surface area (first area) and a side surface area (second area). The excitation light is directed to irradiate only the light incident surface area, while the side surface area is protected from excitation light. This spatial segmentation allows the simple fixed phosphor structure to maintain high fluorescence conversion efficiency by preventing unwanted irradiation of areas outside the intended irradiation zone.
2Device complexity
If a fixed phosphor is irradiated with excitation light, then the structure is simple and cost-effective, but breakage of the bonding interface occurs due to incidence of excitation light
Solution Approach 1:
The phosphor layer is segmented into a light incident surface area and a side surface area. By directing excitation light to irradiate only the light incident surface area and preventing incidence on the side surface area, the bonding interface at the side surface is protected from excitation light-induced stress and heat accumulation, thereby preventing breakage while maintaining the simple fixed phosphor structure.
3Reliability
If the irradiation area is precisely aligned with the light incident surface, then fluorescence conversion efficiency is maintained, but the device complexity increases due to alignment mechanisms
Solution Approach 1:
The phosphor layer is designed with different functional areas: a light incident surface area optimized for receiving excitation light and generating fluorescence, and a side surface area protected from excitation light. This local differentiation of functional properties allows precise alignment to be achieved through the inherent geometric design rather than complex active alignment mechanisms, maintaining fluorescence conversion efficiency while limiting device complexity.
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 the reliability and efficiency of the light source apparatus by ensuring precise alignment of the irradiation area with the light incident surface, reducing heat accumulation, and minimizing stress on the phosphor layer, resulting in a highly reliable and high-luminance image projection.
Implementation Method 1
a wavelength conversion element (40) including a wavelength conversion layer (41)
Data Source
AI summary
A light source apparatus includes a light source section that includes a plurality of light emitting devices and outputs excitation light, a wavelength conversion element including a wavelength conversion layer having a rectangular light incident surface on which the excitation light outputted from the light source section is incident, a lens group that causes the excitation light to be incident on the light incident surface in such a way that an irradiation area irradiated with the excitation light has a rectangular shape on the light incident surface, and an adjuster that adjusts the position of the irradiation area relative to the position of the light incident surface by using a pivotal action around a first axis of rotation extending in a first direction perpendicular to the light incident surface.