Wavelength Conversion Wheel Asymmetric Boundary Design

The patent applies asymmetry by designing the boundary between adjacent wavelength conversion layers to be non-parallel to the radial direction. Specifically, the boundary is inclined at an angle θ (0° < θ < 90°) relative to the radial direction, creating an asymmetric configuration that minimizes the overlap area between the excitation light spot and the boundary region. This asymmetric design ensures that the excitation light spot primarily illuminates the fluorescent powder layers rather than the gap regions, thereby maintaining continuous conversion light beam output while preserving multiple color conversion zones.

The patent applies local quality by creating a boundary region with specific geometric characteristics that differ from the bulk fluorescence powder layers. The inclined boundary at angle θ relative to the radial direction creates a localized transition zone that minimizes unwanted overlap effects. This local geometric modification ensures that each fluorescence powder layer maintains its primary color conversion function while the boundary region is optimized to prevent generation of undesired colors, thus achieving both comprehensive coverage and color purity.

The patent employs asymmetry by deliberately designing the boundary between wavelength conversion layers to be inclined at an angle θ (0° < θ < 90°) relative to the radial direction, rather than parallel to it. This asymmetric configuration optimizes the interaction between the excitation light spot and the wavelength conversion layers, ensuring that the light spot primarily illuminates the fluorescent powder regions. Although this increases manufacturing complexity compared to radial alignment, it significantly improves the conversion rate by minimizing discontinuities and maximizing the effective conversion area.