Wavelength Conversion Device Using Diffraction Lens Array
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Solution Overview
Problem
Existing wavelength conversion devices using solid-state light sources face challenges in achieving high output while minimizing thermal load on phosphor layers, as diffusion of light leads to diffusion losses and increased temperature, reducing wavelength conversion efficiency.
Innovation Solution
A wavelength conversion device incorporating a diffraction type lens array between the light source and phosphor layer, which splits and separates the light to prevent energy concentration on the phosphor layer, thereby reducing thermal load and maintaining high output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If light from solid-state light source is directly irradiated to phosphor layer, then high energy density is achieved, but thermal load on phosphor layer increases and temperature quenching occurs
Solution Approach 1:
The optical member segments the light beam into multiple sub-beams that are projected onto different regions of the phosphor layer. This spatial segmentation distributes the energy density across multiple areas, preventing excessive thermal concentration at any single point while maintaining high overall energy utilization.
Solution Approach 2:
The invention transitions from direct one-to-one irradiation to a multi-dimensional distribution approach. By using an optical member to split and redirect light paths, the energy is distributed across multiple spatial dimensions on the phosphor layer surface, reducing thermal load while preserving energy density.
2Temperature
If diffusing means is used to diffuse light from solid-state light source, then thermal load on phosphor layer is reduced, but diffusion loss occurs and high output is difficult to achieve
Solution Approach 1:
Instead of using conventional diffusing means that scatter light in random directions causing energy loss, the invention segments the light beam into controlled sub-beams using an optical member. This directed segmentation maintains beam coherence and minimizes diffusion loss while achieving thermal load reduction through spatial distribution.
Solution Approach 2:
The invention replaces passive diffusing means with an active optical member that uses refraction and reflection principles to control light paths. This substitution transforms random diffusion into controlled beam segmentation, eliminating diffusion loss while achieving the same thermal management effect.
3Temperature
If light is split and separated by optical member, then energy concentration on phosphor layer is prevented, but optical loss may increase
Solution Approach 1:
The optical member acts as an intermediary that temporarily receives and redirects light energy without significant absorption loss. By using high-quality optical materials with minimal absorption coefficients, the system achieves effective beam segmentation and thermal load reduction while keeping optical transmission losses negligible.
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 device achieves high output while effectively reducing thermal load on the phosphor layer, enhancing primary diffraction efficiency and minimizing optical loss, thus maintaining wavelength conversion efficiency.
Implementation Method 1
optical member that is arranged between the light source and the phosphor layer, splits and separates light emitted from the light source
Implementation Method 2
phosphor layer that performs wavelength conversion on light from the light source incident on an incidence face
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A wavelength conversion device (1) includes a light source (11) for emitting light having a predetermined wavelength in a wavelength region from ultraviolet light to visible light, a phosphor layer (13) for performing wavelength conversion on light which is emitted from the light source (11) and incident on an incidence face, and an optical member (12) which is arranged between the light source (11) and the phosphor layer (13), splits and separates light emitted from the light source (11) and emits the split and separated light beams to the incidence face of phosphor layer (13).