Patent ID: 9432640
Filing Date: 2016-08-30
CPC Classification: G02B,G03B,H04N

Claim Text:
1. An illumination module, comprising: a light source for providing a light beam with a first wavelength band; a color wheel disposed correspondingly to the light source along a traveling path of the light beam, the color wheel having an outer annular section and an inner annular section, wherein a radius of the inner annular section has a smaller length than a radius of the outer annular section, the color wheel comprising: a wavelength conversion segment disposed at the outer annular section, and configured to convert a portion of the light beam with the first wavelength band into a light beam with a second wavelength band, the wavelength conversion segment having at least one wavelength conversion material comprising yttrium aluminum garnet (YAG) phosphors; and a plurality of filter segments disposed at the inner annular section and respectively configured to filter desired wavelength bands of the light beam; an actuator connected to the color wheel and configured to rotate the color wheel; and a reflective unit disposed correspondingly to the color wheel along the traveling path of the light beam and configured to reflect the light beam passing through the outer annular section of the color wheel to the inner annular section of the color wheel, wherein in the same time period, a position that the light beam illuminates the inner annular section of the color wheel is located between a position that the light beam illuminates the outer annular section of the color wheel and a center of the color wheel.