| 摘要 |
A color wheel for use in a DLP projector includes a rotating disk, a color filter, a sensor, and a processor. The rotating disk has two end surfaces, a circumferential side surface extending between the two end surfaces, and a timing mark arranged on the side surface thereof. The color filter is mounted on an end surface of the rotating disk for jointly rotating with the rotating disk. The sensor faces toward the side surface of the rotating disk and is configured for determine a position of the timing mark relative to the color filter. The sensor has a casing defining a light inlet for receiving light reflected from the rotating portion. A shield is disposed around the light inlet of the sensor for preventing stray light coming into the sensor. The processor is electrically connected to the sensor for regarding the color index position of the color filter.
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