Color separating device using dichroic mirror wheel and image projecting apparatus using the same

An image projecting apparatus having a color separating device configured to separate a light emitted from a light source into a plurality of monochromatic lights of different wavelengths, and a panel unit configured to receive an input of the monochromatic lights reflected from the color separating device so as to form on the panel unit corresponding monochromatic color stripes, the color separating device comprising:

• a first reflective wheel unit comprising a plurality of color separating reflective wheels, the plurality of color separating reflective wheels arranged with respect to a rotary shaft in a circumferential direction at equal intervals and configured so as selectively to reflect or to transmit incident lights of the light from the light source;
• a second reflective wheel unit comprising a plurality of color separating reflective wheels, the plurality of color separating reflective wheels arranged with respect to the rotary shaft in a circumferential direction at equal intervals and configured so as selectively to reflect or to transmit incident lights of the light from the light source which are not transmitted through the first reflective wheel unit, the plurality of color separating reflective wheels being at a predetermined distance from the first reflective wheel unit in an axial direction of the rotary shaft;
• a third reflective wheel unit comprising a plurality of color separating reflective wheels, the plurality of color separating reflective wheels arranged in the circumferential direction of the rotary shaft at equal intervals, facing the plurality of color separating reflective wheels of the first reflective wheel unit, and configured so as selectively to reflect or to transmit incident lights of the light which is transmitted through the first reflective wheel unit, the plurality of color separating reflective wheels being at a predetermined distance from the second reflective wheel unit in the axial direction of the rotary shaft;
• and
• a fourth reflective wheel unit comprising a plurality of color separating reflective wheels, the plurality of color separating reflective wheels arranged in the circumferential direction of the rotary shaft at equal intervals, facing the plurality of color separating reflective wheels of the second reflective wheel unit, and configured so as selectively to reflect or to transmit incident lights of the light which is transmitted through the second reflective wheel unit, the plurality of color separating reflective wheels being at a predetermined distance from the third reflective wheel unit in the axial direction of the rotary shaft.