Patent ID: 7233450
Filing Date: 2007-06-19
Classification: G02B

Abstract:
1. A reflective color wheel adapted to receive composite source light provided by a light source, said reflective color wheel comprising: a stack of light-filtering plates disposed parallel to a plane that is transverse to an axis, each of said light-filtering plates including a plurality of light-filtering segments around the axis; a plurality of multi-layer light-reflecting sections for splitting the composite source light into a plurality of colored light beam components; and a multi-layer composite light reflector between an adjacent pair of said multi-layer light-reflecting sections for reflecting the composite source light without splitting the composite source light into the colored light beam components, each of said multi-layer light-reflecting sections including a plurality of light-filtering layers stacked along the axis, each of said light-filtering layers of each of said multi-layer light-reflecting sections being capable of reflecting light within a predefined distinct wavelength range, and permitting transmission of light outside the predefined distinct wavelength range therethrough, wherein sequences of said light-filtering layers of an adjacent pair of said multi-layer light-reflecting sections are different from each other, wherein said light-filtering segments of said light-filtering plates which are aligned along the axis constitute said light-filtering layers of a corresponding one of said multi-layer light-reflecting sections, wherein each of said light-filtering plates further includes a composite-light-reflecting segment, wherein said composite-light-reflecting segments of said light-filtering plates are staggered relative to each other along the axis and constitute said multi-layer composite light reflector.