Projection Illumination System Using Dichroic Wheel Plate

The patent combines multiple light condensing lenses into a single light condensing lens that integrates the functions of multiple individual lenses. This merged lens structure achieves the same light condensing effect as multiple separate lenses while occupying significantly less space, thus resolving the contradiction between improving light emitting efficiency and reducing device volume.

The single light condensing lens is designed to perform multiple functions simultaneously: condensing scattered light from LED sources, directing light to specific areas, and reducing overall system complexity. This multi-functional design eliminates the need for multiple specialized lenses, thereby reducing device volume while maintaining or improving light emitting efficiency.

The patent extracts and separates the blue light path from the green and red light paths using a dichroic mirror. The dichroic mirror reflects blue light while allowing green and red light to pass through, thereby separating the blue light component before it undergoes multiple reflections. This extraction prevents the attenuation that would occur if blue light were reflected multiple times, while still enabling color mixing through the separated paths.

The dichroic mirror acts as an intermediary element that mediates between the blue light source and the green/red light sources. It selectively reflects blue light while transmitting green and red light, creating a controlled interaction point where the light paths converge for color mixing without requiring multiple reflections of the blue light itself. This intermediary structure enables color mixing while minimizing light energy loss.