| 摘要 |
A color wheel unit includes: a color wheel including a plurality of color regions; a motor adapted to rotate the color wheel and including a rotor with a rotary shaft; and a case adapted to house the color wheel and the motor and including a heat radiating means disposed at the outer surface of the case. In the color wheel unit, a first protrusion structure extending radially outwardly is disposed at the outer circumferential surface of the rotor, and a second protrusion structure extending radially inwardly is disposed at the inner surface of the case, wherein the projection area of the second protrusion structure on the plane orthogonal to the rotary shaft of the rotor is overlapped at least partly with the projection area of the first protrusion structure on the plane orthogonal to the rotary shaft of the rotor.
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